* Exim - an Internet mail transport agent *
*************************************************/
+/* Copyright (c) The Exim Maintainers 2020 - 2023 */
/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Functions for handling an incoming SMTP call. */
ETRN_CMD, /* This by analogy with TURN from the RFC */
STARTTLS_CMD, /* Required by the STARTTLS RFC */
TLS_AUTH_CMD, /* auto-command at start of SSL */
+#ifdef EXPERIMENTAL_XCLIENT
+ XCLIENT_CMD, /* per xlexkiro implementation */
+#endif
/* This is a dummy to identify the non-sync commands when pipelining */
* Local static variables *
*************************************************/
-static auth_instance *authenticated_by;
-static BOOL auth_advertised;
-#ifdef SUPPORT_TLS
-static BOOL tls_advertised;
+static struct {
+ BOOL auth_advertised :1;
+#ifndef DISABLE_TLS
+ BOOL tls_advertised :1;
#endif
-static BOOL dsn_advertised;
-static BOOL esmtp;
-static BOOL helo_required = FALSE;
-static BOOL helo_verify = FALSE;
-static BOOL helo_seen;
-static BOOL helo_accept_junk;
-static BOOL count_nonmail;
-static BOOL pipelining_advertised;
-static BOOL rcpt_smtp_response_same;
-static BOOL rcpt_in_progress;
-static int nonmail_command_count;
-static BOOL smtp_exit_function_called = 0;
+ BOOL dsn_advertised :1;
+ BOOL esmtp :1;
+ BOOL helo_verify_required :1;
+ BOOL helo_verify :1;
+ BOOL helo_seen :1;
+ BOOL helo_accept_junk :1;
+#ifndef DISABLE_PIPE_CONNECT
+ BOOL pipe_connect_acceptable :1;
+#endif
+ BOOL rcpt_smtp_response_same :1;
+ BOOL rcpt_in_progress :1;
+ BOOL smtp_exit_function_called :1;
#ifdef SUPPORT_I18N
-static BOOL smtputf8_advertised;
+ BOOL smtputf8_advertised :1;
#endif
+} fl = {
+ .helo_verify_required = FALSE,
+ .helo_verify = FALSE,
+ .smtp_exit_function_called = FALSE,
+};
+
+static auth_instance *authenticated_by;
+static int count_nonmail;
+static int nonmail_command_count;
static int synprot_error_count;
static int unknown_command_count;
static int sync_cmd_limit;
tls_auth is a pseudo-command, never expected in input. It is activated
on TLS startup and looks for a tls authenticator. */
-static smtp_cmd_list cmd_list[] = {
- /* name len cmd has_arg is_mail_cmd */
-
- { "rset", sizeof("rset")-1, RSET_CMD, FALSE, FALSE }, /* First */
- { "helo", sizeof("helo")-1, HELO_CMD, TRUE, FALSE },
- { "ehlo", sizeof("ehlo")-1, EHLO_CMD, TRUE, FALSE },
- { "auth", sizeof("auth")-1, AUTH_CMD, TRUE, TRUE },
- #ifdef SUPPORT_TLS
- { "starttls", sizeof("starttls")-1, STARTTLS_CMD, FALSE, FALSE },
- { "tls_auth", 0, TLS_AUTH_CMD, FALSE, FALSE },
- #endif
+enum {
+ CL_RSET = 0,
+ CL_HELO,
+ CL_EHLO,
+ CL_AUTH,
+#ifndef DISABLE_TLS
+ CL_STLS,
+ CL_TLAU,
+#endif
+#ifdef EXPERIMENTAL_XCLIENT
+ CL_XCLI,
+#endif
+};
-/* If you change anything above here, also fix the definitions below. */
+static smtp_cmd_list cmd_list[] = {
+ /* name len cmd has_arg is_mail_cmd */
+
+ [CL_RSET] = { "rset", sizeof("rset")-1, RSET_CMD, FALSE, FALSE }, /* First */
+ [CL_HELO] = { "helo", sizeof("helo")-1, HELO_CMD, TRUE, FALSE },
+ [CL_EHLO] = { "ehlo", sizeof("ehlo")-1, EHLO_CMD, TRUE, FALSE },
+ [CL_AUTH] = { "auth", sizeof("auth")-1, AUTH_CMD, TRUE, TRUE },
+#ifndef DISABLE_TLS
+ [CL_STLS] = { "starttls", sizeof("starttls")-1, STARTTLS_CMD, FALSE, FALSE },
+ [CL_TLAU] = { "tls_auth", 0, TLS_AUTH_CMD, FALSE, FALSE },
+#endif
+#ifdef EXPERIMENTAL_XCLIENT
+ [CL_XCLI] = { "xclient", sizeof("xclient")-1, XCLIENT_CMD, TRUE, FALSE },
+#endif
{ "mail from:", sizeof("mail from:")-1, MAIL_CMD, TRUE, TRUE },
{ "rcpt to:", sizeof("rcpt to:")-1, RCPT_CMD, TRUE, TRUE },
{ "help", sizeof("help")-1, HELP_CMD, TRUE, FALSE }
};
-static smtp_cmd_list *cmd_list_end =
- cmd_list + sizeof(cmd_list)/sizeof(smtp_cmd_list);
-
-#define CMD_LIST_RSET 0
-#define CMD_LIST_HELO 1
-#define CMD_LIST_EHLO 2
-#define CMD_LIST_AUTH 3
-#define CMD_LIST_STARTTLS 4
-#define CMD_LIST_TLS_AUTH 5
+/* This list of names is used for performing the smtp_no_mail logging action. */
-/* This list of names is used for performing the smtp_no_mail logging action.
-It must be kept in step with the SCH_xxx enumerations. */
-
-static uschar *smtp_names[] =
+uschar * smtp_names[] =
{
- US"NONE", US"AUTH", US"DATA", US"BDAT", US"EHLO", US"ETRN", US"EXPN",
- US"HELO", US"HELP", US"MAIL", US"NOOP", US"QUIT", US"RCPT", US"RSET",
- US"STARTTLS", US"VRFY" };
+ [SCH_NONE] = US"NONE",
+ [SCH_AUTH] = US"AUTH",
+ [SCH_DATA] = US"DATA",
+ [SCH_BDAT] = US"BDAT",
+ [SCH_EHLO] = US"EHLO",
+ [SCH_ETRN] = US"ETRN",
+ [SCH_EXPN] = US"EXPN",
+ [SCH_HELO] = US"HELO",
+ [SCH_HELP] = US"HELP",
+ [SCH_MAIL] = US"MAIL",
+ [SCH_NOOP] = US"NOOP",
+ [SCH_QUIT] = US"QUIT",
+ [SCH_RCPT] = US"RCPT",
+ [SCH_RSET] = US"RSET",
+ [SCH_STARTTLS] = US"STARTTLS",
+ [SCH_VRFY] = US"VRFY",
+#ifdef EXPERIMENTAL_XCLIENT
+ [SCH_XCLIENT] = US"XCLIENT",
+#endif
+ };
static uschar *protocols_local[] = {
US"local-smtp", /* HELO */
static void smtp_rset_handler(void);
/*************************************************
-* Recheck synchronization *
+* Log incomplete transactions *
*************************************************/
-/* Synchronization checks can never be perfect because a packet may be on its
-way but not arrived when the check is done. Normally, the checks happen when
-commands are read: Exim ensures that there is no more input in the input buffer.
-In normal cases, the response to the command will be fast, and there is no
-further check.
-
-However, for some commands an ACL is run, and that can include delays. In those
-cases, it is useful to do another check on the input just before sending the
-response. This also applies at the start of a connection. This function does
-that check by means of the select() function, as long as the facility is not
-disabled or inappropriate. A failure of select() is ignored.
-
-When there is unwanted input, we read it so that it appears in the log of the
-error.
+/* This function is called after a transaction has been aborted by RSET, QUIT,
+connection drops or other errors. It logs the envelope information received
+so far in order to preserve address verification attempts.
-Arguments: none
-Returns: TRUE if all is well; FALSE if there is input pending
+Argument: string to indicate what aborted the transaction
+Returns: nothing
*/
-static BOOL
-wouldblock_reading(void)
+static void
+incomplete_transaction_log(uschar * what)
{
-int fd, rc;
-fd_set fds;
-struct timeval tzero;
+if (!sender_address /* No transaction in progress */
+ || !LOGGING(smtp_incomplete_transaction))
+ return;
-#ifdef SUPPORT_TLS
-if (tls_in.active >= 0)
- return !tls_could_read();
-#endif
+/* Build list of recipients for logging */
-if (smtp_inptr < smtp_inend)
- return FALSE;
+if (recipients_count > 0)
+ {
+ raw_recipients = store_get(recipients_count * sizeof(uschar *), GET_UNTAINTED);
+ for (int i = 0; i < recipients_count; i++)
+ raw_recipients[i] = recipients_list[i].address;
+ raw_recipients_count = recipients_count;
+ }
-fd = fileno(smtp_in);
-FD_ZERO(&fds);
-FD_SET(fd, &fds);
-tzero.tv_sec = 0;
-tzero.tv_usec = 0;
-rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero);
+log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS,
+ "%s incomplete transaction (%s)", host_and_ident(TRUE), what);
+}
-if (rc <= 0) return TRUE; /* Not ready to read */
-rc = smtp_getc(GETC_BUFFER_UNLIMITED);
-if (rc < 0) return TRUE; /* End of file or error */
-smtp_ungetc(rc);
-return FALSE;
-}
-static BOOL
-check_sync(void)
+static void
+log_close_event(const uschar * reason)
{
-if (!smtp_enforce_sync || !sender_host_address || sender_host_notsocket)
- return TRUE;
-
-return wouldblock_reading();
+log_write(L_smtp_connection, LOG_MAIN, "%s D=%s closed %s",
+ smtp_get_connection_info(), string_timesince(&smtp_connection_start), reason);
}
-/* If there's input waiting (and we're doing pipelineing) then we can pipeline
-a reponse with the one following. */
-
-static BOOL
-pipeline_response(void)
+void
+smtp_command_timeout_exit(void)
{
-if ( !smtp_enforce_sync || !sender_host_address
- || sender_host_notsocket || !pipelining_advertised)
- return FALSE;
-
-return !wouldblock_reading();
+log_write(L_lost_incoming_connection,
+ LOG_MAIN, "SMTP command timeout on%s connection from %s D=%s",
+ tls_in.active.sock >= 0 ? " TLS" : "", host_and_ident(FALSE),
+ string_timesince(&smtp_connection_start));
+if (smtp_batched_input)
+ moan_smtp_batch(NULL, "421 SMTP command timeout"); /* Does not return */
+smtp_notquit_exit(US"command-timeout", US"421",
+ US"%s: SMTP command timeout - closing connection",
+ smtp_active_hostname);
+exim_exit(EXIT_FAILURE);
}
+void
+smtp_command_sigterm_exit(void)
+{
+log_close_event(US"after SIGTERM");
+if (smtp_batched_input)
+ moan_smtp_batch(NULL, "421 SIGTERM received"); /* Does not return */
+smtp_notquit_exit(US"signal-exit", US"421",
+ US"%s: Service not available - closing connection", smtp_active_hostname);
+exim_exit(EXIT_FAILURE);
+}
+void
+smtp_data_timeout_exit(void)
+{
+log_write(L_lost_incoming_connection, LOG_MAIN,
+ "SMTP data timeout (message abandoned) on connection from %s F=<%s> D=%s",
+ sender_fullhost ? sender_fullhost : US"local process", sender_address,
+ string_timesince(&smtp_connection_start));
+receive_bomb_out(US"data-timeout", US"SMTP incoming data timeout");
+/* Does not return */
+}
-/*************************************************
-* Log incomplete transactions *
-*************************************************/
+void
+smtp_data_sigint_exit(void)
+{
+log_close_event(had_data_sigint == SIGTERM ? US"SIGTERM":US"SIGINT");
+receive_bomb_out(US"signal-exit",
+ US"Service not available - SIGTERM or SIGINT received");
+/* Does not return */
+}
-/* This function is called after a transaction has been aborted by RSET, QUIT,
-connection drops or other errors. It logs the envelope information received
-so far in order to preserve address verification attempts.
-Argument: string to indicate what aborted the transaction
-Returns: nothing
-*/
+/******************************************************************************/
+/* SMTP input buffer handling. Most of these are similar to stdio routines. */
static void
-incomplete_transaction_log(uschar *what)
+smtp_buf_init(void)
{
-if (sender_address == NULL || /* No transaction in progress */
- !LOGGING(smtp_incomplete_transaction))
- return;
-
-/* Build list of recipients for logging */
+/* Set up the buffer for inputting using direct read() calls, and arrange to
+call the local functions instead of the standard C ones. Place a NUL at the
+end of the buffer to safety-stop C-string reads from it. */
-if (recipients_count > 0)
- {
- int i;
- raw_recipients = store_get(recipients_count * sizeof(uschar *));
- for (i = 0; i < recipients_count; i++)
- raw_recipients[i] = recipients_list[i].address;
- raw_recipients_count = recipients_count;
- }
+if (!(smtp_inbuffer = US malloc(IN_BUFFER_SIZE)))
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "malloc() failed for SMTP input buffer");
+smtp_inbuffer[IN_BUFFER_SIZE-1] = '\0';
-log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS,
- "%s incomplete transaction (%s)", host_and_ident(TRUE), what);
+smtp_inptr = smtp_inend = smtp_inbuffer;
+smtp_had_eof = smtp_had_error = 0;
}
-
/* Refill the buffer, and notify DKIM verification code.
Return false for error or EOF.
*/
smtp_refill(unsigned lim)
{
int rc, save_errno;
+
if (!smtp_out) return FALSE;
fflush(smtp_out);
-if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout);
+if (smtp_receive_timeout > 0) ALARM(smtp_receive_timeout);
/* Limit amount read, so non-message data is not fed to DKIM.
Take care to not touch the safety NUL at the end of the buffer. */
rc = read(fileno(smtp_in), smtp_inbuffer, MIN(IN_BUFFER_SIZE-1, lim));
save_errno = errno;
-alarm(0);
+if (smtp_receive_timeout > 0) ALARM_CLR(0);
if (rc <= 0)
{
/* Must put the error text in fixed store, because this might be during
header reading, where it releases unused store above the header. */
if (rc < 0)
{
+ if (had_command_timeout) /* set by signal handler */
+ smtp_command_timeout_exit(); /* does not return */
+ if (had_command_sigterm)
+ smtp_command_sigterm_exit();
+ if (had_data_timeout)
+ smtp_data_timeout_exit();
+ if (had_data_sigint)
+ smtp_data_sigint_exit();
+
smtp_had_error = save_errno;
- smtp_read_error = string_copy_malloc(
- string_sprintf(" (error: %s)", strerror(save_errno)));
+ smtp_read_error = string_copy_perm(
+ string_sprintf(" (error: %s)", strerror(save_errno)), FALSE);
}
- else smtp_had_eof = 1;
+ else
+ smtp_had_eof = 1;
return FALSE;
}
#ifndef DISABLE_DKIM
return TRUE;
}
-/*************************************************
-* SMTP version of getc() *
-*************************************************/
-/* This gets the next byte from the SMTP input buffer. If the buffer is empty,
+/* Check if there is buffered data */
+
+BOOL
+smtp_hasc(void)
+{
+return smtp_inptr < smtp_inend;
+}
+
+/* SMTP version of getc()
+
+This gets the next byte from the SMTP input buffer. If the buffer is empty,
it flushes the output, and refills the buffer, with a timeout. The signal
handler is set appropriately by the calling function. This function is not used
after a connection has negotiated itself into an TLS/SSL state.
int
smtp_getc(unsigned lim)
{
-if (smtp_inptr >= smtp_inend)
- if (!smtp_refill(lim))
- return EOF;
+if (!smtp_hasc() && !smtp_refill(lim)) return EOF;
return *smtp_inptr++;
}
+/* Get many bytes, refilling buffer if needed */
+
uschar *
smtp_getbuf(unsigned * len)
{
unsigned size;
uschar * buf;
-if (smtp_inptr >= smtp_inend)
- if (!smtp_refill(*len))
- { *len = 0; return NULL; }
+if (!smtp_hasc() && !smtp_refill(*len))
+ { *len = 0; return NULL; }
if ((size = smtp_inend - smtp_inptr) > *len) size = *len;
buf = smtp_inptr;
return buf;
}
+/* Copy buffered data to the dkim feed.
+Called, unless TLS, just before starting to read message headers. */
+
void
-smtp_get_cache(void)
+smtp_get_cache(unsigned lim)
{
#ifndef DISABLE_DKIM
int n = smtp_inend - smtp_inptr;
+if (n > lim)
+ n = lim;
if (n > 0)
dkim_exim_verify_feed(smtp_inptr, n);
#endif
}
+/* SMTP version of ungetc()
+Puts a character back in the input buffer. Only ever called once.
+
+Arguments:
+ ch the character
+
+Returns: the character
+*/
+
+int
+smtp_ungetc(int ch)
+{
+if (smtp_inptr <= smtp_inbuffer) /* NB: NOT smtp_hasc() ! */
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "buffer underflow in smtp_ungetc");
+
+*--smtp_inptr = ch;
+return ch;
+}
+
+
+/* SMTP version of feof()
+Tests for a previous EOF
+
+Arguments: none
+Returns: non-zero if the eof flag is set
+*/
+
+int
+smtp_feof(void)
+{
+return smtp_had_eof;
+}
+
+
+/* SMTP version of ferror()
+Tests for a previous read error, and returns with errno
+restored to what it was when the error was detected.
+
+Arguments: none
+Returns: non-zero if the error flag is set
+*/
+
+int
+smtp_ferror(void)
+{
+errno = smtp_had_error;
+return smtp_had_error;
+}
+
+
+/* Check if a getc will block or not */
+
+static BOOL
+smtp_could_getc(void)
+{
+int fd, rc;
+fd_set fds;
+struct timeval tzero = {.tv_sec = 0, .tv_usec = 0};
+
+if (smtp_inptr < smtp_inend)
+ return TRUE;
+
+fd = fileno(smtp_in);
+FD_ZERO(&fds);
+FD_SET(fd, &fds);
+rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero);
+
+if (rc <= 0) return FALSE; /* Not ready to read */
+rc = smtp_getc(GETC_BUFFER_UNLIMITED);
+if (rc < 0) return FALSE; /* End of file or error */
+
+smtp_ungetc(rc);
+return TRUE;
+}
+
+
+/******************************************************************************/
+/*************************************************
+* Recheck synchronization *
+*************************************************/
+
+/* Synchronization checks can never be perfect because a packet may be on its
+way but not arrived when the check is done. Normally, the checks happen when
+commands are read: Exim ensures that there is no more input in the input buffer.
+In normal cases, the response to the command will be fast, and there is no
+further check.
+
+However, for some commands an ACL is run, and that can include delays. In those
+cases, it is useful to do another check on the input just before sending the
+response. This also applies at the start of a connection. This function does
+that check by means of the select() function, as long as the facility is not
+disabled or inappropriate. A failure of select() is ignored.
+
+When there is unwanted input, we read it so that it appears in the log of the
+error.
+
+Arguments: none
+Returns: TRUE if all is well; FALSE if there is input pending
+*/
+
+static BOOL
+wouldblock_reading(void)
+{
+#ifndef DISABLE_TLS
+if (tls_in.active.sock >= 0)
+ return !tls_could_getc();
+#endif
+
+return !smtp_could_getc();
+}
+
+static BOOL
+check_sync(void)
+{
+if (!smtp_enforce_sync || !sender_host_address || f.sender_host_notsocket)
+ return TRUE;
+
+return wouldblock_reading();
+}
+
+
+/******************************************************************************/
+/* Variants of the smtp_* input handling functions for use in CHUNKING mode */
+
+/* Forward declarations */
+static inline void bdat_push_receive_functions(void);
+static inline void bdat_pop_receive_functions(void);
+
+
/* Get a byte from the smtp input, in CHUNKING mode. Handle ack of the
previous BDAT chunk and getting new ones when we run out. Uses the
underlying smtp_getc or tls_getc both for that and for getting the
for(;;)
{
#ifndef DISABLE_DKIM
- BOOL dkim_save;
+ unsigned dkim_save;
#endif
if (chunking_data_left > 0)
return lwr_receive_getc(chunking_data_left--);
- receive_getc = lwr_receive_getc;
- receive_getbuf = lwr_receive_getbuf;
- receive_ungetc = lwr_receive_ungetc;
+ bdat_pop_receive_functions();
#ifndef DISABLE_DKIM
dkim_save = dkim_collect_input;
- dkim_collect_input = FALSE;
+ dkim_collect_input = 0;
#endif
/* Unless PIPELINING was offered, there should be no next command
until after we ack that chunk */
- if (!pipelining_advertised && !check_sync())
+ if (!f.smtp_in_pipelining_advertised && !check_sync())
{
unsigned n = smtp_inend - smtp_inptr;
if (n > 32) n = 32;
if (chunking_state == CHUNKING_LAST)
{
#ifndef DISABLE_DKIM
+ dkim_collect_input = dkim_save;
dkim_exim_verify_feed(NULL, 0); /* notify EOD */
+ dkim_collect_input = 0;
#endif
return EOD;
}
- smtp_printf("250 %u byte chunk received\r\n", FALSE, chunking_datasize);
+ smtp_printf("250 %u byte chunk received\r\n", SP_NO_MORE, chunking_datasize);
chunking_state = CHUNKING_OFFERED;
DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
case NOOP_CMD:
HAD(SCH_NOOP);
- smtp_printf("250 OK\r\n", FALSE);
+ smtp_printf("250 OK\r\n", SP_NO_MORE);
goto next_cmd;
case BDAT_CMD:
goto repeat_until_rset;
}
- receive_getc = bdat_getc;
- receive_getbuf = bdat_getbuf; /* r~getbuf is never actually used */
- receive_ungetc = bdat_ungetc;
+ bdat_push_receive_functions();
#ifndef DISABLE_DKIM
dkim_collect_input = dkim_save;
#endif
}
}
+BOOL
+bdat_hasc(void)
+{
+if (chunking_data_left > 0)
+ return lwr_receive_hasc();
+return TRUE;
+}
+
uschar *
bdat_getbuf(unsigned * len)
{
if (!bdat_getbuf(&n)) break;
}
-receive_getc = lwr_receive_getc;
-receive_getbuf = lwr_receive_getbuf;
-receive_ungetc = lwr_receive_ungetc;
-
-if (chunking_state != CHUNKING_LAST)
- {
- chunking_state = CHUNKING_OFFERED;
- DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
- }
+bdat_pop_receive_functions();
+chunking_state = CHUNKING_OFFERED;
+DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
}
+static inline void
+bdat_push_receive_functions(void)
+{
+/* push the current receive_* function on the "stack", and
+replace them by bdat_getc(), which in turn will use the lwr_receive_*
+functions to do the dirty work. */
+if (!lwr_receive_getc)
+ {
+ lwr_receive_getc = receive_getc;
+ lwr_receive_getbuf = receive_getbuf;
+ lwr_receive_hasc = receive_hasc;
+ lwr_receive_ungetc = receive_ungetc;
+ }
+else
+ {
+ DEBUG(D_receive) debug_printf("chunking double-push receive functions\n");
+ }
+receive_getc = bdat_getc;
+receive_getbuf = bdat_getbuf;
+receive_hasc = bdat_hasc;
+receive_ungetc = bdat_ungetc;
+}
-/*************************************************
-* SMTP version of ungetc() *
-*************************************************/
-
-/* Puts a character back in the input buffer. Only ever
-called once.
-
-Arguments:
- ch the character
-
-Returns: the character
-*/
-
-int
-smtp_ungetc(int ch)
+static inline void
+bdat_pop_receive_functions(void)
{
-*--smtp_inptr = ch;
-return ch;
-}
+if (!lwr_receive_getc)
+ {
+ DEBUG(D_receive) debug_printf("chunking double-pop receive functions\n");
+ return;
+ }
+receive_getc = lwr_receive_getc;
+receive_getbuf = lwr_receive_getbuf;
+receive_hasc = lwr_receive_hasc;
+receive_ungetc = lwr_receive_ungetc;
+lwr_receive_getc = NULL;
+lwr_receive_getbuf = NULL;
+lwr_receive_hasc = NULL;
+lwr_receive_ungetc = NULL;
+}
int
bdat_ungetc(int ch)
{
chunking_data_left++;
+bdat_push_receive_functions(); /* we're not done yet, calling push is safe, because it checks the state before pushing anything */
return lwr_receive_ungetc(ch);
}
-/*************************************************
-* SMTP version of feof() *
-*************************************************/
-
-/* Tests for a previous EOF
-
-Arguments: none
-Returns: non-zero if the eof flag is set
-*/
-
-int
-smtp_feof(void)
-{
-return smtp_had_eof;
-}
-
-
-
-
-/*************************************************
-* SMTP version of ferror() *
-*************************************************/
-
-/* Tests for a previous read error, and returns with errno
-restored to what it was when the error was detected.
-
-Arguments: none
-Returns: non-zero if the error flag is set
-*/
-
-int
-smtp_ferror(void)
-{
-errno = smtp_had_error;
-return smtp_had_error;
-}
-
-
-
-/*************************************************
-* Test for characters in the SMTP buffer *
-*************************************************/
-
-/* Used at the end of a message
-
-Arguments: none
-Returns: TRUE/FALSE
-*/
-
-BOOL
-smtp_buffered(void)
-{
-return smtp_inptr < smtp_inend;
-}
-
-
+/******************************************************************************/
/*************************************************
* Write formatted string to SMTP channel *
checking that: for convenience, TLS output errors are remembered here so that
they are also picked up later by smtp_fflush().
+This function is exposed to the local_scan API; do not change the signature.
+
Arguments:
format format string
more further data expected
/* This is split off so that verify.c:respond_printf() can, in effect, call
smtp_printf(), bearing in mind that in C a vararg function can't directly
-call another vararg function, only a function which accepts a va_list. */
+call another vararg function, only a function which accepts a va_list.
+
+This function is exposed to the local_scan API; do not change the signature.
+*/
+/*XXX consider passing caller-info in, for string_vformat-onward */
void
smtp_vprintf(const char *format, BOOL more, va_list ap)
{
+gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer };
BOOL yield;
-yield = string_vformat(big_buffer, big_buffer_size, format, ap);
+/* Use taint-unchecked routines for writing into big_buffer, trusting
+that we'll never expand it. */
-DEBUG(D_receive)
- {
- void *reset_point = store_get(0);
- uschar *msg_copy, *cr, *end;
- msg_copy = string_copy(big_buffer);
- end = msg_copy + Ustrlen(msg_copy);
- while ((cr = Ustrchr(msg_copy, '\r')) != NULL) /* lose CRs */
- memmove(cr, cr + 1, (end--) - cr);
- debug_printf("SMTP>> %s", msg_copy);
- store_reset(reset_point);
- }
+yield = !! string_vformat(&gs, SVFMT_TAINT_NOCHK, format, ap);
+string_from_gstring(&gs);
+
+DEBUG(D_receive) for (const uschar * t, * s = gs.s;
+ s && (t = Ustrchr(s, '\r'));
+ s = t + 2) /* \r\n */
+ debug_printf("%s %.*s\n",
+ s == gs.s ? "SMTP>>" : " ",
+ (int)(t - s), s);
if (!yield)
{
log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_printf()");
smtp_closedown(US"Unexpected error");
- exim_exit(EXIT_FAILURE, NULL);
+ exim_exit(EXIT_FAILURE);
}
/* If this is the first output for a (non-batch) RCPT command, see if all RCPTs
do it that way, so as not to have to mess with the code for the RCPT command,
which sometimes uses smtp_printf() and sometimes smtp_respond(). */
-if (rcpt_in_progress)
+if (fl.rcpt_in_progress)
{
- if (rcpt_smtp_response == NULL)
+ if (!rcpt_smtp_response)
rcpt_smtp_response = string_copy(big_buffer);
- else if (rcpt_smtp_response_same &&
+ else if (fl.rcpt_smtp_response_same &&
Ustrcmp(rcpt_smtp_response, big_buffer) != 0)
- rcpt_smtp_response_same = FALSE;
- rcpt_in_progress = FALSE;
+ fl.rcpt_smtp_response_same = FALSE;
+ fl.rcpt_in_progress = FALSE;
}
/* Now write the string */
-#ifdef SUPPORT_TLS
-if (tls_in.active >= 0)
- {
- if (tls_write(TRUE, big_buffer, Ustrlen(big_buffer), more) < 0)
- smtp_write_error = -1;
- }
-else
+if (
+#ifndef DISABLE_TLS
+ tls_in.active.sock >= 0 ? (tls_write(NULL, gs.s, gs.ptr, more) < 0) :
#endif
-
-if (fprintf(smtp_out, "%s", big_buffer) < 0) smtp_write_error = -1;
+ (fwrite(gs.s, gs.ptr, 1, smtp_out) == 0)
+ )
+ smtp_write_error = -1;
}
/* This function isn't currently used within Exim (it detects errors when it
tries to read the next SMTP input), but is available for use in local_scan().
-For non-TLS connections, it flushes the output and checks for errors. For
-TLS-connections, it checks for a previously-detected TLS write error.
+It flushes the output and checks for errors.
Arguments: none
Returns: 0 for no error; -1 after an error
int
smtp_fflush(void)
{
-if (tls_in.active < 0 && fflush(smtp_out) != 0) smtp_write_error = -1;
+if (tls_in.active.sock < 0 && fflush(smtp_out) != 0) smtp_write_error = -1;
+
+if (
+#ifndef DISABLE_TLS
+ tls_in.active.sock >= 0 ? (tls_write(NULL, NULL, 0, FALSE) < 0) :
+#endif
+ (fflush(smtp_out) != 0)
+ )
+ smtp_write_error = -1;
+
return smtp_write_error;
}
+/* If there's input waiting (and we're doing pipelineing) then we can pipeline
+a reponse with the one following. */
+
+static BOOL
+pipeline_response(void)
+{
+if ( !smtp_enforce_sync || !sender_host_address
+ || f.sender_host_notsocket || !f.smtp_in_pipelining_advertised)
+ return FALSE;
+
+if (wouldblock_reading()) return FALSE;
+f.smtp_in_pipelining_used = TRUE;
+return TRUE;
+}
+
+
+#ifndef DISABLE_PIPE_CONNECT
+static BOOL
+pipeline_connect_sends(void)
+{
+if (!sender_host_address || f.sender_host_notsocket || !fl.pipe_connect_acceptable)
+ return FALSE;
+
+if (wouldblock_reading()) return FALSE;
+f.smtp_in_early_pipe_used = TRUE;
+return TRUE;
+}
+#endif
+
/*************************************************
* SMTP command read timeout *
*************************************************/
static void
command_timeout_handler(int sig)
{
-sig = sig; /* Keep picky compilers happy */
-log_write(L_lost_incoming_connection,
- LOG_MAIN, "SMTP command timeout on%s connection from %s",
- (tls_in.active >= 0)? " TLS" : "",
- host_and_ident(FALSE));
-if (smtp_batched_input)
- moan_smtp_batch(NULL, "421 SMTP command timeout"); /* Does not return */
-smtp_notquit_exit(US"command-timeout", US"421",
- US"%s: SMTP command timeout - closing connection", smtp_active_hostname);
-exim_exit(EXIT_FAILURE, US"receiving");
+had_command_timeout = sig;
}
static void
command_sigterm_handler(int sig)
{
-sig = sig; /* Keep picky compilers happy */
-log_write(0, LOG_MAIN, "%s closed after SIGTERM", smtp_get_connection_info());
-if (smtp_batched_input)
- moan_smtp_batch(NULL, "421 SIGTERM received"); /* Does not return */
-smtp_notquit_exit(US"signal-exit", US"421",
- US"%s: Service not available - closing connection", smtp_active_hostname);
-exim_exit(EXIT_FAILURE, US"receiving");
+had_command_sigterm = sig;
}
-#ifdef SUPPORT_PROXY
-/*************************************************
-* Restore socket timeout to previous value *
-*************************************************/
-/* If the previous value was successfully retrieved, restore
-it before returning control to the non-proxy routines
-
-Arguments: fd - File descriptor for input
- get_ok - Successfully retrieved previous values
- tvtmp - Time struct with previous values
- vslen - Length of time struct
-Returns: none
-*/
-static void
-restore_socket_timeout(int fd, int get_ok, struct timeval * tvtmp, socklen_t vslen)
-{
-if (get_ok == 0)
- (void) setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS tvtmp, vslen);
-}
-
/*************************************************
-* Check if host is required proxy host *
+* Read one command line *
*************************************************/
-/* The function determines if inbound host will be a regular smtp host
-or if it is configured that it must use Proxy Protocol. A local
-connection cannot.
-
-Arguments: none
-Returns: bool
-*/
-static BOOL
-check_proxy_protocol_host()
-{
-int rc;
+/* Strictly, SMTP commands coming over the net are supposed to end with CRLF.
+There are sites that don't do this, and in any case internal SMTP probably
+should check only for LF. Consequently, we check here for LF only. The line
+ends up with [CR]LF removed from its end. If we get an overlong line, treat as
+an unknown command. The command is read into the global smtp_cmd_buffer so that
+it is available via $smtp_command.
-if ( sender_host_address
- && (rc = verify_check_this_host(CUSS &hosts_proxy, NULL, NULL,
- sender_host_address, NULL)) == OK)
- {
- DEBUG(D_receive)
- debug_printf("Detected proxy protocol configured host\n");
- proxy_session = TRUE;
- }
-return proxy_session;
-}
+The character reading routine sets up a timeout for each block actually read
+from the input (which may contain more than one command). We set up a special
+signal handler that closes down the session on a timeout. Control does not
+return when it runs.
+Arguments:
+ check_sync if TRUE, check synchronization rules if global option is TRUE
+ buffer_lim maximum to buffer in lower layer
-/*************************************************
-* Read data until newline or end of buffer *
-*************************************************/
-/* While SMTP is server-speaks-first, TLS is client-speaks-first, so we can't
-read an entire buffer and assume there will be nothing past a proxy protocol
-header. Our approach normally is to use stdio, but again that relies upon
-"STARTTLS\r\n" and a server response before the client starts TLS handshake, or
-reading _nothing_ before client TLS handshake. So we don't want to use the
-usual buffering reads which may read enough to block TLS starting.
-
-So unfortunately we're down to "read one byte at a time, with a syscall each,
-and expect a little overhead", for all proxy-opened connections which are v1,
-just to handle the TLS-on-connect case. Since SSL functions wrap the
-underlying fd, we can't assume that we can feed them any already-read content.
-
-We need to know where to read to, the max capacity, and we'll read until we
-get a CR and one more character. Let the caller scream if it's CR+!LF.
-
-Return the amount read.
+Returns: a code identifying the command (enumerated above)
*/
static int
-swallow_until_crlf(int fd, uschar *base, int already, int capacity)
+smtp_read_command(BOOL check_sync, unsigned buffer_lim)
{
-uschar *to = base + already;
-uschar *cr;
-int have = 0;
-int ret;
-int last = 0;
+int c;
+int ptr = 0;
+BOOL hadnull = FALSE;
-/* For "PROXY UNKNOWN\r\n" we, at time of writing, expect to have read
-up through the \r; for the _normal_ case, we haven't yet seen the \r. */
+had_command_timeout = 0;
+os_non_restarting_signal(SIGALRM, command_timeout_handler);
-cr = memchr(base, '\r', already);
-if (cr != NULL)
+while ((c = (receive_getc)(buffer_lim)) != '\n' && c != EOF)
{
- if ((cr - base) < already - 1)
+ if (ptr >= SMTP_CMD_BUFFER_SIZE)
+ {
+ os_non_restarting_signal(SIGALRM, sigalrm_handler);
+ return OTHER_CMD;
+ }
+ if (c == 0)
{
- /* \r and presumed \n already within what we have; probably not
- actually proxy protocol, but abort cleanly. */
- return 0;
+ hadnull = TRUE;
+ c = '?';
}
- /* \r is last character read, just need one more. */
- last = 1;
+ smtp_cmd_buffer[ptr++] = c;
}
-while (capacity > 0)
- {
- do { ret = recv(fd, to, 1, 0); } while (ret == -1 && errno == EINTR);
- if (ret == -1)
- return -1;
- have++;
- if (last)
- return have;
- if (*to == '\r')
- last = 1;
- capacity--;
- to++;
- }
+receive_linecount++; /* For BSMTP errors */
+os_non_restarting_signal(SIGALRM, sigalrm_handler);
-/* reached end without having room for a final newline, abort */
-errno = EOVERFLOW;
-return -1;
-}
+/* If hit end of file, return pseudo EOF command. Whether we have a
+part-line already read doesn't matter, since this is an error state. */
-/*************************************************
-* Setup host for proxy protocol *
-*************************************************/
-/* The function configures the connection based on a header from the
-inbound host to use Proxy Protocol. The specification is very exact
-so exit with an error if do not find the exact required pieces. This
-includes an incorrect number of spaces separating args.
+if (c == EOF) return EOF_CMD;
-Arguments: none
-Returns: Boolean success
-*/
+/* Remove any CR and white space at the end of the line, and terminate the
+string. */
-static void
-setup_proxy_protocol_host()
-{
-union {
- struct {
- uschar line[108];
- } v1;
- struct {
- uschar sig[12];
- uint8_t ver_cmd;
- uint8_t fam;
- uint16_t len;
- union {
- struct { /* TCP/UDP over IPv4, len = 12 */
- uint32_t src_addr;
- uint32_t dst_addr;
- uint16_t src_port;
- uint16_t dst_port;
- } ip4;
- struct { /* TCP/UDP over IPv6, len = 36 */
- uint8_t src_addr[16];
- uint8_t dst_addr[16];
- uint16_t src_port;
- uint16_t dst_port;
- } ip6;
- struct { /* AF_UNIX sockets, len = 216 */
- uschar src_addr[108];
- uschar dst_addr[108];
- } unx;
- } addr;
- } v2;
-} hdr;
-
-/* Temp variables used in PPv2 address:port parsing */
-uint16_t tmpport;
-char tmpip[INET_ADDRSTRLEN];
-struct sockaddr_in tmpaddr;
-char tmpip6[INET6_ADDRSTRLEN];
-struct sockaddr_in6 tmpaddr6;
-
-/* We can't read "all data until end" because while SMTP is
-server-speaks-first, the TLS handshake is client-speaks-first, so for
-TLS-on-connect ports the proxy protocol header will usually be immediately
-followed by a TLS handshake, and with N TLS libraries, we can't reliably
-reinject data for reading by those. So instead we first read "enough to be
-safely read within the header, and figure out how much more to read".
-For v1 we will later read to the end-of-line, for v2 we will read based upon
-the stated length.
-
-The v2 sig is 12 octets, and another 4 gets us the length, so we know how much
-data is needed total. For v1, where the line looks like:
-PROXY TCPn L3src L3dest SrcPort DestPort \r\n
-
-However, for v1 there's also `PROXY UNKNOWN\r\n` which is only 15 octets.
-We seem to support that. So, if we read 14 octets then we can tell if we're
-v2 or v1. If we're v1, we can continue reading as normal.
-
-If we're v2, we can't slurp up the entire header. We need the length in the
-15th & 16th octets, then to read everything after that.
-
-So to safely handle v1 and v2, with client-sent-first supported correctly,
-we have to do a minimum of 3 read calls, not 1. Eww.
-*/
+while (ptr > 0 && isspace(smtp_cmd_buffer[ptr-1])) ptr--;
+smtp_cmd_buffer[ptr] = 0;
-#define PROXY_INITIAL_READ 14
-#define PROXY_V2_HEADER_SIZE 16
-#if PROXY_INITIAL_READ > PROXY_V2_HEADER_SIZE
-# error Code bug in sizes of data to read for proxy usage
-#endif
+DEBUG(D_receive) debug_printf("SMTP<< %s\n", smtp_cmd_buffer);
-int get_ok = 0;
-int size, ret;
-int fd = fileno(smtp_in);
-const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A";
-uschar * iptype; /* To display debug info */
-struct timeval tv;
-struct timeval tvtmp;
-socklen_t vslen = sizeof(struct timeval);
-BOOL yield = FALSE;
-
-/* Save current socket timeout values */
-get_ok = getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tvtmp, &vslen);
-
-/* Proxy Protocol host must send header within a short time
-(default 3 seconds) or it's considered invalid */
-tv.tv_sec = PROXY_NEGOTIATION_TIMEOUT_SEC;
-tv.tv_usec = PROXY_NEGOTIATION_TIMEOUT_USEC;
-if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tv, sizeof(tv)) < 0)
- goto bad;
-
-do
- {
- /* The inbound host was declared to be a Proxy Protocol host, so
- don't do a PEEK into the data, actually slurp up enough to be
- "safe". Can't take it all because TLS-on-connect clients follow
- immediately with TLS handshake. */
- ret = recv(fd, &hdr, PROXY_INITIAL_READ, 0);
- }
- while (ret == -1 && errno == EINTR);
+/* NULLs are not allowed in SMTP commands */
-if (ret == -1)
- goto proxyfail;
+if (hadnull) return BADCHAR_CMD;
-/* For v2, handle reading the length, and then the rest. */
-if ((ret == PROXY_INITIAL_READ) && (memcmp(&hdr.v2, v2sig, sizeof(v2sig)) == 0))
- {
- int retmore;
- uint8_t ver;
+/* Scan command list and return identity, having set the data pointer
+to the start of the actual data characters. Check for SMTP synchronization
+if required. */
- /* First get the length fields. */
- do
+for (smtp_cmd_list * p = cmd_list; p < cmd_list + nelem(cmd_list); p++)
+ {
+#ifdef SUPPORT_PROXY
+ /* Only allow QUIT command if Proxy Protocol parsing failed */
+ if (proxy_session && f.proxy_session_failed && p->cmd != QUIT_CMD)
+ continue;
+#endif
+ if ( p->len
+ && strncmpic(smtp_cmd_buffer, US p->name, p->len) == 0
+ && ( smtp_cmd_buffer[p->len-1] == ':' /* "mail from:" or "rcpt to:" */
+ || smtp_cmd_buffer[p->len] == 0
+ || smtp_cmd_buffer[p->len] == ' '
+ ) )
{
- retmore = recv(fd, (uschar*)&hdr + ret, PROXY_V2_HEADER_SIZE - PROXY_INITIAL_READ, 0);
- } while (retmore == -1 && errno == EINTR);
- if (retmore == -1)
- goto proxyfail;
- ret += retmore;
-
- ver = (hdr.v2.ver_cmd & 0xf0) >> 4;
+ if ( smtp_inptr < smtp_inend /* Outstanding input */
+ && p->cmd < sync_cmd_limit /* Command should sync */
+ && check_sync /* Local flag set */
+ && smtp_enforce_sync /* Global flag set */
+ && sender_host_address != NULL /* Not local input */
+ && !f.sender_host_notsocket /* Really is a socket */
+ )
+ return BADSYN_CMD;
- /* May 2014: haproxy combined the version and command into one byte to
- allow two full bytes for the length field in order to proxy SSL
- connections. SSL Proxy is not supported in this version of Exim, but
- must still separate values here. */
+ /* The variables $smtp_command and $smtp_command_argument point into the
+ unmodified input buffer. A copy of the latter is taken for actual
+ processing, so that it can be chopped up into separate parts if necessary,
+ for example, when processing a MAIL command options such as SIZE that can
+ follow the sender address. */
- if (ver != 0x02)
- {
- DEBUG(D_receive) debug_printf("Invalid Proxy Protocol version: %d\n", ver);
- goto proxyfail;
- }
+ smtp_cmd_argument = smtp_cmd_buffer + p->len;
+ Uskip_whitespace(&smtp_cmd_argument);
+ Ustrcpy(smtp_data_buffer, smtp_cmd_argument);
+ smtp_cmd_data = smtp_data_buffer;
- /* The v2 header will always be 16 bytes per the spec. */
- size = 16 + ntohs(hdr.v2.len);
- DEBUG(D_receive) debug_printf("Detected PROXYv2 header, size %d (limit %d)\n",
- size, (int)sizeof(hdr));
+ /* Count non-mail commands from those hosts that are controlled in this
+ way. The default is all hosts. We don't waste effort checking the list
+ until we get a non-mail command, but then cache the result to save checking
+ again. If there's a DEFER while checking the host, assume it's in the list.
- /* We should now have 16 octets (PROXY_V2_HEADER_SIZE), and we know the total
- amount that we need. Double-check that the size is not unreasonable, then
- get the rest. */
- if (size > sizeof(hdr))
- {
- DEBUG(D_receive) debug_printf("PROXYv2 header size unreasonably large; security attack?\n");
- goto proxyfail;
- }
+ Note that one instance of RSET, EHLO/HELO, and STARTTLS is allowed at the
+ start of each incoming message by fiddling with the value in the table. */
- do
- {
- do
+ if (!p->is_mail_cmd)
{
- retmore = recv(fd, (uschar*)&hdr + ret, size-ret, 0);
- } while (retmore == -1 && errno == EINTR);
- if (retmore == -1)
- goto proxyfail;
- ret += retmore;
- DEBUG(D_receive) debug_printf("PROXYv2: have %d/%d required octets\n", ret, size);
- } while (ret < size);
+ if (count_nonmail == TRUE_UNSET) count_nonmail =
+ verify_check_host(&smtp_accept_max_nonmail_hosts) != FAIL;
+ if (count_nonmail && ++nonmail_command_count > smtp_accept_max_nonmail)
+ return TOO_MANY_NONMAIL_CMD;
+ }
- } /* end scope for getting rest of data for v2 */
+ /* If there is data for a command that does not expect it, generate the
+ error here. */
-/* At this point: if PROXYv2, we've read the exact size required for all data;
-if PROXYv1 then we've read "less than required for any valid line" and should
-read the rest". */
+ return (p->has_arg || *smtp_cmd_data == 0)? p->cmd : BADARG_CMD;
+ }
+ }
-if (ret >= 16 && memcmp(&hdr.v2, v2sig, 12) == 0)
- {
- uint8_t cmd = (hdr.v2.ver_cmd & 0x0f);
-
- switch (cmd)
- {
- case 0x01: /* PROXY command */
- switch (hdr.v2.fam)
- {
- case 0x11: /* TCPv4 address type */
- iptype = US"IPv4";
- tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.src_addr;
- inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip));
- if (!string_is_ip_address(US tmpip, NULL))
- {
- DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype);
- goto proxyfail;
- }
- proxy_local_address = sender_host_address;
- sender_host_address = string_copy(US tmpip);
- tmpport = ntohs(hdr.v2.addr.ip4.src_port);
- proxy_local_port = sender_host_port;
- sender_host_port = tmpport;
- /* Save dest ip/port */
- tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.dst_addr;
- inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip));
- if (!string_is_ip_address(US tmpip, NULL))
- {
- DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype);
- goto proxyfail;
- }
- proxy_external_address = string_copy(US tmpip);
- tmpport = ntohs(hdr.v2.addr.ip4.dst_port);
- proxy_external_port = tmpport;
- goto done;
- case 0x21: /* TCPv6 address type */
- iptype = US"IPv6";
- memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.src_addr, 16);
- inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6));
- if (!string_is_ip_address(US tmpip6, NULL))
- {
- DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype);
- goto proxyfail;
- }
- proxy_local_address = sender_host_address;
- sender_host_address = string_copy(US tmpip6);
- tmpport = ntohs(hdr.v2.addr.ip6.src_port);
- proxy_local_port = sender_host_port;
- sender_host_port = tmpport;
- /* Save dest ip/port */
- memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.dst_addr, 16);
- inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6));
- if (!string_is_ip_address(US tmpip6, NULL))
- {
- DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype);
- goto proxyfail;
- }
- proxy_external_address = string_copy(US tmpip6);
- tmpport = ntohs(hdr.v2.addr.ip6.dst_port);
- proxy_external_port = tmpport;
- goto done;
- default:
- DEBUG(D_receive)
- debug_printf("Unsupported PROXYv2 connection type: 0x%02x\n",
- hdr.v2.fam);
- goto proxyfail;
- }
- /* Unsupported protocol, keep local connection address */
- break;
- case 0x00: /* LOCAL command */
- /* Keep local connection address for LOCAL */
- iptype = US"local";
- break;
- default:
- DEBUG(D_receive)
- debug_printf("Unsupported PROXYv2 command: 0x%x\n", cmd);
- goto proxyfail;
- }
- }
-else if (ret >= 8 && memcmp(hdr.v1.line, "PROXY", 5) == 0)
- {
- uschar *p;
- uschar *end;
- uschar *sp; /* Utility variables follow */
- int tmp_port;
- int r2;
- char *endc;
-
- /* get the rest of the line */
- r2 = swallow_until_crlf(fd, (uschar*)&hdr, ret, sizeof(hdr)-ret);
- if (r2 == -1)
- goto proxyfail;
- ret += r2;
-
- p = string_copy(hdr.v1.line);
- end = memchr(p, '\r', ret - 1);
-
- if (!end || (end == (uschar*)&hdr + ret) || end[1] != '\n')
- {
- DEBUG(D_receive) debug_printf("Partial or invalid PROXY header\n");
- goto proxyfail;
- }
- *end = '\0'; /* Terminate the string */
- size = end + 2 - p; /* Skip header + CRLF */
- DEBUG(D_receive) debug_printf("Detected PROXYv1 header\n");
- DEBUG(D_receive) debug_printf("Bytes read not within PROXY header: %d\n", ret - size);
- /* Step through the string looking for the required fields. Ensure
- strict adherence to required formatting, exit for any error. */
- p += 5;
- if (!isspace(*(p++)))
- {
- DEBUG(D_receive) debug_printf("Missing space after PROXY command\n");
- goto proxyfail;
- }
- if (!Ustrncmp(p, CCS"TCP4", 4))
- iptype = US"IPv4";
- else if (!Ustrncmp(p,CCS"TCP6", 4))
- iptype = US"IPv6";
- else if (!Ustrncmp(p,CCS"UNKNOWN", 7))
- {
- iptype = US"Unknown";
- goto done;
- }
- else
- {
- DEBUG(D_receive) debug_printf("Invalid TCP type\n");
- goto proxyfail;
- }
-
- p += Ustrlen(iptype);
- if (!isspace(*(p++)))
- {
- DEBUG(D_receive) debug_printf("Missing space after TCP4/6 command\n");
- goto proxyfail;
- }
- /* Find the end of the arg */
- if ((sp = Ustrchr(p, ' ')) == NULL)
- {
- DEBUG(D_receive)
- debug_printf("Did not find proxied src %s\n", iptype);
- goto proxyfail;
- }
- *sp = '\0';
- if(!string_is_ip_address(p, NULL))
- {
- DEBUG(D_receive)
- debug_printf("Proxied src arg is not an %s address\n", iptype);
- goto proxyfail;
- }
- proxy_local_address = sender_host_address;
- sender_host_address = p;
- p = sp + 1;
- if ((sp = Ustrchr(p, ' ')) == NULL)
- {
- DEBUG(D_receive)
- debug_printf("Did not find proxy dest %s\n", iptype);
- goto proxyfail;
- }
- *sp = '\0';
- if(!string_is_ip_address(p, NULL))
- {
- DEBUG(D_receive)
- debug_printf("Proxy dest arg is not an %s address\n", iptype);
- goto proxyfail;
- }
- proxy_external_address = p;
- p = sp + 1;
- if ((sp = Ustrchr(p, ' ')) == NULL)
- {
- DEBUG(D_receive) debug_printf("Did not find proxied src port\n");
- goto proxyfail;
- }
- *sp = '\0';
- tmp_port = strtol(CCS p, &endc, 10);
- if (*endc || tmp_port == 0)
- {
- DEBUG(D_receive)
- debug_printf("Proxied src port '%s' not an integer\n", p);
- goto proxyfail;
- }
- proxy_local_port = sender_host_port;
- sender_host_port = tmp_port;
- p = sp + 1;
- if ((sp = Ustrchr(p, '\0')) == NULL)
- {
- DEBUG(D_receive) debug_printf("Did not find proxy dest port\n");
- goto proxyfail;
- }
- tmp_port = strtol(CCS p, &endc, 10);
- if (*endc || tmp_port == 0)
- {
- DEBUG(D_receive)
- debug_printf("Proxy dest port '%s' not an integer\n", p);
- goto proxyfail;
- }
- proxy_external_port = tmp_port;
- /* Already checked for /r /n above. Good V1 header received. */
- }
-else
- {
- /* Wrong protocol */
- DEBUG(D_receive) debug_printf("Invalid proxy protocol version negotiation\n");
- (void) swallow_until_crlf(fd, (uschar*)&hdr, ret, sizeof(hdr)-ret);
- goto proxyfail;
- }
-
-done:
- DEBUG(D_receive)
- debug_printf("Valid %s sender from Proxy Protocol header\n", iptype);
- yield = proxy_session;
-
-/* Don't flush any potential buffer contents. Any input on proxyfail
-should cause a synchronization failure */
-
-proxyfail:
- restore_socket_timeout(fd, get_ok, &tvtmp, vslen);
-
-bad:
- if (yield)
- {
- sender_host_name = NULL;
- (void) host_name_lookup();
- host_build_sender_fullhost();
- }
- else
- {
- proxy_session_failed = TRUE;
- DEBUG(D_receive)
- debug_printf("Failure to extract proxied host, only QUIT allowed\n");
- }
-
-return;
-}
-#endif
-
-/*************************************************
-* Read one command line *
-*************************************************/
-
-/* Strictly, SMTP commands coming over the net are supposed to end with CRLF.
-There are sites that don't do this, and in any case internal SMTP probably
-should check only for LF. Consequently, we check here for LF only. The line
-ends up with [CR]LF removed from its end. If we get an overlong line, treat as
-an unknown command. The command is read into the global smtp_cmd_buffer so that
-it is available via $smtp_command.
-
-The character reading routine sets up a timeout for each block actually read
-from the input (which may contain more than one command). We set up a special
-signal handler that closes down the session on a timeout. Control does not
-return when it runs.
-
-Arguments:
- check_sync if TRUE, check synchronization rules if global option is TRUE
- buffer_lim maximum to buffer in lower layer
-
-Returns: a code identifying the command (enumerated above)
-*/
-
-static int
-smtp_read_command(BOOL check_sync, unsigned buffer_lim)
-{
-int c;
-int ptr = 0;
-smtp_cmd_list *p;
-BOOL hadnull = FALSE;
-
-os_non_restarting_signal(SIGALRM, command_timeout_handler);
-
-while ((c = (receive_getc)(buffer_lim)) != '\n' && c != EOF)
- {
- if (ptr >= SMTP_CMD_BUFFER_SIZE)
- {
- os_non_restarting_signal(SIGALRM, sigalrm_handler);
- return OTHER_CMD;
- }
- if (c == 0)
- {
- hadnull = TRUE;
- c = '?';
- }
- smtp_cmd_buffer[ptr++] = c;
- }
-
-receive_linecount++; /* For BSMTP errors */
-os_non_restarting_signal(SIGALRM, sigalrm_handler);
-
-/* If hit end of file, return pseudo EOF command. Whether we have a
-part-line already read doesn't matter, since this is an error state. */
-
-if (c == EOF) return EOF_CMD;
-
-/* Remove any CR and white space at the end of the line, and terminate the
-string. */
-
-while (ptr > 0 && isspace(smtp_cmd_buffer[ptr-1])) ptr--;
-smtp_cmd_buffer[ptr] = 0;
-
-DEBUG(D_receive) debug_printf("SMTP<< %s\n", smtp_cmd_buffer);
-
-/* NULLs are not allowed in SMTP commands */
-
-if (hadnull) return BADCHAR_CMD;
-
-/* Scan command list and return identity, having set the data pointer
-to the start of the actual data characters. Check for SMTP synchronization
-if required. */
-
-for (p = cmd_list; p < cmd_list_end; p++)
- {
-#ifdef SUPPORT_PROXY
- /* Only allow QUIT command if Proxy Protocol parsing failed */
- if (proxy_session && proxy_session_failed && p->cmd != QUIT_CMD)
- continue;
-#endif
- if ( p->len
- && strncmpic(smtp_cmd_buffer, US p->name, p->len) == 0
- && ( smtp_cmd_buffer[p->len-1] == ':' /* "mail from:" or "rcpt to:" */
- || smtp_cmd_buffer[p->len] == 0
- || smtp_cmd_buffer[p->len] == ' '
- ) )
- {
- if (smtp_inptr < smtp_inend && /* Outstanding input */
- p->cmd < sync_cmd_limit && /* Command should sync */
- check_sync && /* Local flag set */
- smtp_enforce_sync && /* Global flag set */
- sender_host_address != NULL && /* Not local input */
- !sender_host_notsocket) /* Really is a socket */
- return BADSYN_CMD;
-
- /* The variables $smtp_command and $smtp_command_argument point into the
- unmodified input buffer. A copy of the latter is taken for actual
- processing, so that it can be chopped up into separate parts if necessary,
- for example, when processing a MAIL command options such as SIZE that can
- follow the sender address. */
-
- smtp_cmd_argument = smtp_cmd_buffer + p->len;
- while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++;
- Ustrcpy(smtp_data_buffer, smtp_cmd_argument);
- smtp_cmd_data = smtp_data_buffer;
-
- /* Count non-mail commands from those hosts that are controlled in this
- way. The default is all hosts. We don't waste effort checking the list
- until we get a non-mail command, but then cache the result to save checking
- again. If there's a DEFER while checking the host, assume it's in the list.
-
- Note that one instance of RSET, EHLO/HELO, and STARTTLS is allowed at the
- start of each incoming message by fiddling with the value in the table. */
-
- if (!p->is_mail_cmd)
- {
- if (count_nonmail == TRUE_UNSET) count_nonmail =
- verify_check_host(&smtp_accept_max_nonmail_hosts) != FAIL;
- if (count_nonmail && ++nonmail_command_count > smtp_accept_max_nonmail)
- return TOO_MANY_NONMAIL_CMD;
- }
-
- /* If there is data for a command that does not expect it, generate the
- error here. */
-
- return (p->has_arg || *smtp_cmd_data == 0)? p->cmd : BADARG_CMD;
- }
- }
-
-#ifdef SUPPORT_PROXY
-/* Only allow QUIT command if Proxy Protocol parsing failed */
-if (proxy_session && proxy_session_failed)
- return PROXY_FAIL_IGNORE_CMD;
-#endif
+#ifdef SUPPORT_PROXY
+/* Only allow QUIT command if Proxy Protocol parsing failed */
+if (proxy_session && f.proxy_session_failed)
+ return PROXY_FAIL_IGNORE_CMD;
+#endif
/* Enforce synchronization for unknown commands */
&& check_sync /* Local flag set */
&& smtp_enforce_sync /* Global flag set */
&& sender_host_address /* Not local input */
- && !sender_host_notsocket) /* Really is a socket */
+ && !f.sender_host_notsocket /* Really is a socket */
+ )
return BADSYN_CMD;
return OTHER_CMD;
+
/*************************************************
* Forced closedown of call *
*************************************************/
*/
void
-smtp_closedown(uschar *message)
+smtp_closedown(uschar * message)
{
if (!smtp_in || smtp_batched_input) return;
receive_swallow_smtp();
-smtp_printf("421 %s\r\n", FALSE, message);
+smtp_printf("421 %s\r\n", SP_NO_MORE, message);
for (;;) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
{
return;
case QUIT_CMD:
- smtp_printf("221 %s closing connection\r\n", FALSE, smtp_active_hostname);
+ f.smtp_in_quit = TRUE;
+ smtp_printf("221 %s closing connection\r\n", SP_NO_MORE, smtp_active_hostname);
mac_smtp_fflush();
return;
case RSET_CMD:
- smtp_printf("250 Reset OK\r\n", FALSE);
+ smtp_printf("250 Reset OK\r\n", SP_NO_MORE);
break;
default:
- smtp_printf("421 %s\r\n", FALSE, message);
+ smtp_printf("421 %s\r\n", SP_NO_MORE, message);
break;
}
}
{
const uschar * hostname = sender_fullhost
? sender_fullhost : sender_host_address;
+gstring * g = string_catn(NULL, US"SMTP connection", 15);
+
+if (LOGGING(connection_id))
+ g = string_fmt_append(g, " Ci=%lu", connection_id);
+g = string_catn(g, US" from ", 6);
if (host_checking)
- return string_sprintf("SMTP connection from %s", hostname);
+ g = string_cat(g, hostname);
+
+else if (f.sender_host_unknown || f.sender_host_notsocket)
+ g = string_cat(g, sender_ident ? sender_ident : US"NULL");
-if (sender_host_unknown || sender_host_notsocket)
- return string_sprintf("SMTP connection from %s", sender_ident);
+else if (f.is_inetd)
+ g = string_append(g, 2, hostname, US" (via inetd)");
-if (is_inetd)
- return string_sprintf("SMTP connection from %s (via inetd)", hostname);
+else if (LOGGING(incoming_interface) && interface_address)
+ g = string_fmt_append(g, "%s I=[%s]:%d", hostname, interface_address, interface_port);
-if (LOGGING(incoming_interface) && interface_address != NULL)
- return string_sprintf("SMTP connection from %s I=[%s]:%d", hostname,
- interface_address, interface_port);
+else
+ g = string_cat(g, hostname);
-return string_sprintf("SMTP connection from %s", hostname);
+gstring_release_unused(g);
+return string_from_gstring(g);
}
-#ifdef SUPPORT_TLS
+#ifndef DISABLE_TLS
/* Append TLS-related information to a log line
Arguments:
s_tlslog(gstring * g)
{
if (LOGGING(tls_cipher) && tls_in.cipher)
+ {
g = string_append(g, 2, US" X=", tls_in.cipher);
+#ifndef DISABLE_TLS_RESUME
+ if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
+ g = string_catn(g, US"*", 1);
+#endif
+ }
if (LOGGING(tls_certificate_verified) && tls_in.cipher)
g = string_append(g, 2, US" CV=", tls_in.certificate_verified? "yes":"no");
if (LOGGING(tls_peerdn) && tls_in.peerdn)
g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
if (LOGGING(tls_sni) && tls_in.sni)
- g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
+ g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
return g;
}
#endif
+
+
+static gstring *
+s_connhad_log(gstring * g)
+{
+const uschar * sep = smtp_connection_had[SMTP_HBUFF_SIZE-1] != SCH_NONE
+ ? US" C=..." : US" C=";
+
+for (int i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++)
+ if (smtp_connection_had[i] != SCH_NONE)
+ {
+ g = string_append(g, 2, sep, smtp_names[smtp_connection_had[i]]);
+ sep = US",";
+ }
+for (int i = 0; i < smtp_ch_index; i++, sep = US",")
+ g = string_append(g, 2, sep, smtp_names[smtp_connection_had[i]]);
+return g;
+}
+
+
/*************************************************
* Log lack of MAIL if so configured *
*************************************************/
void
smtp_log_no_mail(void)
{
-int i;
-uschar * sep, * s;
+uschar * s;
gstring * g = NULL;
if (smtp_mailcmd_count > 0 || !LOGGING(smtp_no_mail))
if (authenticated_id) g = string_append(g, 2, US":", authenticated_id);
}
-#ifdef SUPPORT_TLS
+#ifndef DISABLE_TLS
g = s_tlslog(g);
#endif
-sep = smtp_connection_had[SMTP_HBUFF_SIZE-1] != SCH_NONE ? US" C=..." : US" C=";
-
-for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++)
- if (smtp_connection_had[i] != SCH_NONE)
- {
- g = string_append(g, 2, sep, smtp_names[smtp_connection_had[i]]);
- sep = US",";
- }
-
-for (i = 0; i < smtp_ch_index; i++)
- {
- g = string_append(g, 2, sep, smtp_names[smtp_connection_had[i]]);
- sep = US",";
- }
+g = s_connhad_log(g);
if (!(s = string_from_gstring(g))) s = US"";
log_write(0, LOG_MAIN, "no MAIL in %sSMTP connection from %s D=%s%s",
- tcp_in_fastopen ? US"TFO " : US"",
+ f.tcp_in_fastopen ? f.tcp_in_fastopen_data ? US"TFO* " : US"TFO " : US"",
host_and_ident(FALSE), string_timesince(&smtp_connection_start), s);
}
uschar *
smtp_cmd_hist(void)
{
-int i;
gstring * list = NULL;
uschar * s;
-for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++)
+for (int i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++)
if (smtp_connection_had[i] != SCH_NONE)
list = string_append_listele(list, ',', smtp_names[smtp_connection_had[i]]);
-for (i = 0; i < smtp_ch_index; i++)
+for (int i = 0; i < smtp_ch_index; i++)
list = string_append_listele(list, ',', smtp_names[smtp_connection_had[i]]);
s = string_from_gstring(list);
{
uschar *start = s;
uschar *end = s + Ustrlen(s);
-BOOL yield = helo_accept_junk;
+BOOL yield = fl.helo_accept_junk;
/* Discard any previous helo name */
-if (sender_helo_name)
- {
- store_free(sender_helo_name);
- sender_helo_name = NULL;
- }
+sender_helo_name = NULL;
/* Skip tests if junk is permitted. */
/* Save argument if OK */
-if (yield) sender_helo_name = string_copy_malloc(start);
+if (yield) sender_helo_name = string_copy_perm(start, TRUE);
return yield;
}
extract_option(uschar **name, uschar **value)
{
uschar *n;
-uschar *v = smtp_cmd_data + Ustrlen(smtp_cmd_data) - 1;
-while (isspace(*v)) v--;
+uschar *v;
+if (Ustrlen(smtp_cmd_data) <= 0) return FALSE;
+v = smtp_cmd_data + Ustrlen(smtp_cmd_data) - 1;
+while (v > smtp_cmd_data && isspace(*v)) v--;
v[1] = 0;
+
while (v > smtp_cmd_data && *v != '=' && !isspace(*v))
{
/* Take care to not stop at a space embedded in a quoted local-part */
-
- if (*v == '"') do v--; while (*v != '"' && v > smtp_cmd_data+1);
+ if (*v == '"')
+ {
+ do v--; while (v > smtp_cmd_data && *v != '"');
+ if (v <= smtp_cmd_data) return FALSE;
+ }
v--;
}
+if (v <= smtp_cmd_data) return FALSE;
n = v;
if (*v == '=')
{
- while(isalpha(n[-1])) n--;
+ while (n > smtp_cmd_data && isalpha(n[-1])) n--;
/* RFC says SP, but TAB seen in wild and other major MTAs accept it */
- if (!isspace(n[-1])) return FALSE;
+ if (n <= smtp_cmd_data || !isspace(n[-1])) return FALSE;
n[-1] = 0;
}
else
{
n++;
- if (v == smtp_cmd_data) return FALSE;
}
*v++ = 0;
*name = n;
Returns: nothing
*/
-void
+void *
smtp_reset(void *reset_point)
{
recipients_list = NULL;
raw_recipients_count = recipients_count = recipients_list_max = 0;
message_linecount = 0;
message_size = -1;
+message_body = message_body_end = NULL;
acl_added_headers = NULL;
acl_removed_headers = NULL;
-queue_only_policy = FALSE;
+f.queue_only_policy = FALSE;
rcpt_smtp_response = NULL;
-rcpt_smtp_response_same = TRUE;
-rcpt_in_progress = FALSE;
-deliver_freeze = FALSE; /* Can be set by ACL */
-freeze_tell = freeze_tell_config; /* Can be set by ACL */
-fake_response = OK; /* Can be set by ACL */
+fl.rcpt_smtp_response_same = TRUE;
+fl.rcpt_in_progress = FALSE;
+f.deliver_freeze = FALSE; /* Can be set by ACL */
+freeze_tell = freeze_tell_config; /* Can be set by ACL */
+fake_response = OK; /* Can be set by ACL */
#ifdef WITH_CONTENT_SCAN
-no_mbox_unspool = FALSE; /* Can be set by ACL */
+f.no_mbox_unspool = FALSE; /* Can be set by ACL */
#endif
-submission_mode = FALSE; /* Can be set by ACL */
-suppress_local_fixups = suppress_local_fixups_default; /* Can be set by ACL */
-active_local_from_check = local_from_check; /* Can be set by ACL */
-active_local_sender_retain = local_sender_retain; /* Can be set by ACL */
+f.submission_mode = FALSE; /* Can be set by ACL */
+f.suppress_local_fixups = f.suppress_local_fixups_default; /* Can be set by ACL */
+f.active_local_from_check = local_from_check; /* Can be set by ACL */
+f.active_local_sender_retain = local_sender_retain; /* Can be set by ACL */
sending_ip_address = NULL;
return_path = sender_address = NULL;
-sender_data = NULL; /* Can be set by ACL */
+deliver_localpart_data = deliver_domain_data =
+recipient_data = sender_data = NULL; /* Can be set by ACL */
+recipient_verify_failure = NULL;
deliver_localpart_parent = deliver_localpart_orig = NULL;
deliver_domain_parent = deliver_domain_orig = NULL;
callout_address = NULL;
-submission_name = NULL; /* Can be set by ACL */
+submission_name = NULL; /* Can be set by ACL */
raw_sender = NULL; /* After SMTP rewrite, before qualifying */
sender_address_unrewritten = NULL; /* Set only after verify rewrite */
sender_verified_list = NULL; /* No senders verified */
bmi_verdicts = NULL;
#endif
dnslist_domain = dnslist_matched = NULL;
+#ifdef SUPPORT_SPF
+spf_header_comment = spf_received = spf_result = spf_smtp_comment = NULL;
+spf_result_guessed = FALSE;
+#endif
#ifndef DISABLE_DKIM
-dkim_cur_signer = dkim_signers = NULL;
-dkim_disable_verify = dkim_collect_input = FALSE;
+dkim_cur_signer = dkim_signers =
+dkim_signing_domain = dkim_signing_selector = dkim_signatures = NULL;
+dkim_cur_signer = dkim_signers = dkim_signing_domain = dkim_signing_selector = NULL;
+f.dkim_disable_verify = FALSE;
+dkim_collect_input = 0;
+dkim_verify_overall = dkim_verify_status = dkim_verify_reason = NULL;
+dkim_key_length = 0;
+#endif
+#ifdef SUPPORT_DMARC
+f.dmarc_has_been_checked = f.dmarc_disable_verify = f.dmarc_enable_forensic = FALSE;
+dmarc_domain_policy = dmarc_status = dmarc_status_text =
+dmarc_used_domain = NULL;
+#endif
+#ifdef EXPERIMENTAL_ARC
+arc_state = arc_state_reason = NULL;
+arc_received_instance = 0;
#endif
dsn_ret = 0;
dsn_envid = NULL;
#ifndef DISABLE_PRDR
prdr_requested = FALSE;
#endif
-#ifdef SUPPORT_SPF
-spf_header_comment = spf_received = spf_result = spf_smtp_comment = NULL;
-#endif
-#ifdef EXPERIMENTAL_DMARC
-dmarc_has_been_checked = dmarc_disable_verify = dmarc_enable_forensic = FALSE;
-dmarc_domain_policy = dmarc_forensic_sender =
-dmarc_history_file = dmarc_status = dmarc_status_text =
-dmarc_tld_file = dmarc_used_domain = NULL;
-#endif
-#ifdef EXPERIMENTAL_ARC
-arc_state = arc_state_reason = NULL;
-#endif
#ifdef SUPPORT_I18N
message_smtputf8 = FALSE;
#endif
+#ifdef WITH_CONTENT_SCAN
+regex_vars_clear();
+#endif
body_linecount = body_zerocount = 0;
+lookup_value = NULL; /* Can be set by ACL */
sender_rate = sender_rate_limit = sender_rate_period = NULL;
ratelimiters_mail = NULL; /* Updated by ratelimit ACL condition */
/* Note that ratelimiters_conn persists across resets. */
acl_var_m = NULL;
-/* The message body variables use malloc store. They may be set if this is
-not the first message in an SMTP session and the previous message caused them
-to be referenced in an ACL. */
-
-if (message_body)
- {
- store_free(message_body);
- message_body = NULL;
- }
-
-if (message_body_end)
- {
- store_free(message_body_end);
- message_body_end = NULL;
- }
-
-/* Warning log messages are also saved in malloc store. They are saved to avoid
+/* Warning log messages are saved in malloc store. They are saved to avoid
repetition in the same message, but it seems right to repeat them for different
messages. */
acl_warn_logged = acl_warn_logged->next;
store_free(this);
}
+
+message_tidyup();
store_reset(reset_point);
+
+message_start();
+return store_mark();
}
smtp_setup_batch_msg(void)
{
int done = 0;
-void *reset_point = store_get(0);
+rmark reset_point = store_mark();
/* Save the line count at the start of each transaction - single commands
like HELO and RSET count as whole transactions. */
if ((receive_feof)()) return 0; /* Treat EOF as QUIT */
cancel_cutthrough_connection(TRUE, US"smtp_setup_batch_msg");
-smtp_reset(reset_point); /* Reset for start of message */
+reset_point = smtp_reset(reset_point); /* Reset for start of message */
/* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE
value. The values are 2 larger than the required yield of the function. */
case RSET_CMD:
cancel_cutthrough_connection(TRUE, US"RSET received");
- smtp_reset(reset_point);
+ reset_point = smtp_reset(reset_point);
bsmtp_transaction_linecount = receive_linecount;
break;
-
/* The MAIL FROM command requires an address as an operand. All we
do here is to parse it for syntactic correctness. The form "<>" is
a special case which converts into an empty string. The start/end
case MAIL_CMD:
smtp_mailcmd_count++; /* Count for no-mail log */
- if (sender_address != NULL)
+ if (sender_address)
/* The function moan_smtp_batch() does not return. */
moan_smtp_batch(smtp_cmd_buffer, "503 Sender already given");
/* Reset to start of message */
cancel_cutthrough_connection(TRUE, US"MAIL received");
- smtp_reset(reset_point);
+ reset_point = smtp_reset(reset_point);
/* Apply SMTP rewrite */
- raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)?
- rewrite_one(smtp_cmd_data, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE,
- US"", global_rewrite_rules) : smtp_cmd_data;
+ raw_sender = rewrite_existflags & rewrite_smtp
+ /* deconst ok as smtp_cmd_data was not const */
+ ? US rewrite_one(smtp_cmd_data, rewrite_smtp|rewrite_smtp_sender, NULL,
+ FALSE, US"", global_rewrite_rules)
+ : smtp_cmd_data;
/* Extract the address; the TRUE flag allows <> as valid */
if ( !sender_domain
&& sender_address[0] != 0 && sender_address[0] != '@')
- if (allow_unqualified_sender)
+ if (f.allow_unqualified_sender)
{
- sender_address = rewrite_address_qualify(sender_address, FALSE);
+ /* deconst ok as sender_address was not const */
+ sender_address = US rewrite_address_qualify(sender_address, FALSE);
DEBUG(D_receive) debug_printf("unqualified address %s accepted "
"and rewritten\n", raw_sender);
}
/* Check maximum number allowed */
- if (recipients_max > 0 && recipients_count + 1 > recipients_max)
+ if ( recipients_max_expanded > 0
+ && recipients_count + 1 > recipients_max_expanded)
/* The function moan_smtp_batch() does not return. */
moan_smtp_batch(smtp_cmd_buffer, "%s too many recipients",
- recipients_max_reject? "552": "452");
+ recipients_max_reject ? "552": "452");
/* Apply SMTP rewrite, then extract address. Don't allow "<>" as a
recipient address */
recipient = rewrite_existflags & rewrite_smtp
- ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
+ /* deconst ok as smtp_cmd_data was not const */
+ ? US rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
global_rewrite_rules)
: smtp_cmd_data;
add it to the list of recipients. */
if (!recipient_domain)
- if (allow_unqualified_recipient)
+ if (f.allow_unqualified_recipient)
{
DEBUG(D_receive) debug_printf("unqualified address %s accepted\n",
recipient);
- recipient = rewrite_address_qualify(recipient, TRUE);
+ /* deconst ok as recipient was not const */
+ recipient = US rewrite_address_qualify(recipient, TRUE);
}
/* The function moan_smtp_batch() does not return. */
else
case HELP_CMD:
case NOOP_CMD:
case ETRN_CMD:
+#ifdef EXPERIMENTAL_WELLKNOWN
+ case WELLKNOWN_CMD:
+#endif
bsmtp_transaction_linecount = receive_linecount;
break;
- case EOF_CMD:
case QUIT_CMD:
+ f.smtp_in_quit = TRUE;
+ case EOF_CMD:
done = 2;
break;
+#ifndef DISABLE_TLS
static BOOL
-smtp_log_tls_fail(uschar * errstr)
+smtp_log_tls_fail(const uschar * errstr)
{
-uschar * conn_info = smtp_get_connection_info();
+const uschar * conn_info = smtp_get_connection_info();
if (Ustrncmp(conn_info, US"SMTP ", 5) == 0) conn_info += 5;
/* I'd like to get separated H= here, but too hard for now */
log_write(0, LOG_MAIN, "TLS error on %s %s", conn_info, errstr);
return FALSE;
}
+#endif
static void
tfo_in_check(void)
{
-# ifdef TCP_INFO
-struct tcp_info tinfo;
-socklen_t len = sizeof(tinfo);
+# ifdef __FreeBSD__
+int is_fastopen;
+socklen_t len = sizeof(is_fastopen);
-if ( getsockopt(fileno(smtp_out), IPPROTO_TCP, TCP_INFO, &tinfo, &len) == 0
- && tinfo.tcpi_state == TCP_SYN_RECV
- )
+/* The tinfo TCPOPT_FAST_OPEN bit seems unreliable, and we don't see state
+TCP_SYN_RCV (as of 12.1) so no idea about data-use. */
+
+if (getsockopt(fileno(smtp_out), IPPROTO_TCP, TCP_FASTOPEN, &is_fastopen, &len) == 0)
{
- DEBUG(D_receive) debug_printf("TCP_FASTOPEN mode connection (state TCP_SYN_RECV)\n");
- tcp_in_fastopen = TRUE;
+ if (is_fastopen)
+ {
+ DEBUG(D_receive)
+ debug_printf("TFO mode connection (TCP_FASTOPEN getsockopt)\n");
+ f.tcp_in_fastopen = TRUE;
+ }
}
+else DEBUG(D_receive)
+ debug_printf("TCP_INFO getsockopt: %s\n", strerror(errno));
+
+# elif defined(TCP_INFO)
+struct tcp_info tinfo;
+socklen_t len = sizeof(tinfo);
+
+if (getsockopt(fileno(smtp_out), IPPROTO_TCP, TCP_INFO, &tinfo, &len) == 0)
+# ifdef TCPI_OPT_SYN_DATA /* FreeBSD 11,12 do not seem to have this yet */
+ if (tinfo.tcpi_options & TCPI_OPT_SYN_DATA)
+ {
+ DEBUG(D_receive)
+ debug_printf("TFO mode connection (ACKd data-on-SYN)\n");
+ f.tcp_in_fastopen_data = f.tcp_in_fastopen = TRUE;
+ }
+ else
+# endif
+ if (tinfo.tcpi_state == TCP_SYN_RECV) /* Not seen on FreeBSD 12.1 */
+ {
+ DEBUG(D_receive)
+ debug_printf("TFO mode connection (state TCP_SYN_RECV)\n");
+ f.tcp_in_fastopen = TRUE;
+ }
+else DEBUG(D_receive)
+ debug_printf("TCP_INFO getsockopt: %s\n", strerror(errno));
# endif
}
#endif
+static void
+log_connect_tls_drop(const uschar * what, const uschar * log_msg)
+{
+if (log_reject_target)
+ {
+ gstring * g = s_tlslog(NULL);
+ uschar * tls = string_from_gstring(g);
+
+ log_write(L_connection_reject,
+ log_reject_target, "%s%s%s dropped by %s%s%s",
+ LOGGING(dnssec) && sender_host_dnssec ? US" DS" : US"",
+ host_and_ident(TRUE),
+ tls ? tls : US"",
+ what,
+ log_msg ? US": " : US"", log_msg);
+ }
+}
+
+
/*************************************************
* Start an SMTP session *
*************************************************/
/* Default values for certain variables */
-helo_seen = esmtp = helo_accept_junk = FALSE;
+fl.helo_seen = fl.esmtp = fl.helo_accept_junk = FALSE;
smtp_mailcmd_count = 0;
count_nonmail = TRUE_UNSET;
synprot_error_count = unknown_command_count = nonmail_command_count = 0;
smtp_delay_mail = smtp_rlm_base;
-auth_advertised = FALSE;
-pipelining_advertised = FALSE;
-pipelining_enable = TRUE;
+fl.auth_advertised = FALSE;
+f.smtp_in_pipelining_advertised = f.smtp_in_pipelining_used = FALSE;
+f.pipelining_enable = TRUE;
sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING;
-smtp_exit_function_called = FALSE; /* For avoiding loop in not-quit exit */
+fl.smtp_exit_function_called = FALSE; /* For avoiding loop in not-quit exit */
/* If receiving by -bs from a trusted user, or testing with -bh, we allow
authentication settings from -oMaa to remain in force. */
-if (!host_checking && !sender_host_notsocket)
+if (!host_checking && !f.sender_host_notsocket)
sender_host_auth_pubname = sender_host_authenticated = NULL;
authenticated_by = NULL;
-#ifdef SUPPORT_TLS
-tls_in.cipher = tls_in.peerdn = NULL;
+#ifndef DISABLE_TLS
+tls_in.ver = tls_in.cipher = tls_in.peerdn = NULL;
tls_in.ourcert = tls_in.peercert = NULL;
tls_in.sni = NULL;
tls_in.ocsp = OCSP_NOT_REQ;
-tls_advertised = FALSE;
+fl.tls_advertised = FALSE;
#endif
-dsn_advertised = FALSE;
+fl.dsn_advertised = FALSE;
#ifdef SUPPORT_I18N
-smtputf8_advertised = FALSE;
+fl.smtputf8_advertised = FALSE;
#endif
/* Reset ACL connection variables */
acl_var_c = NULL;
-/* Allow for trailing 0 in the command and data buffers. */
+/* Allow for trailing 0 in the command and data buffers. Tainted. */
-if (!(smtp_cmd_buffer = US malloc(2*SMTP_CMD_BUFFER_SIZE + 2)))
- log_write(0, LOG_MAIN|LOG_PANIC_DIE,
- "malloc() failed for SMTP command buffer");
+smtp_cmd_buffer = store_get_perm(2*SMTP_CMD_BUFFER_SIZE + 2, GET_TAINTED);
smtp_cmd_buffer[0] = 0;
smtp_data_buffer = smtp_cmd_buffer + SMTP_CMD_BUFFER_SIZE + 1;
(sender_host_address ? protocols : protocols_local) [pnormal];
/* Set up the buffer for inputting using direct read() calls, and arrange to
-call the local functions instead of the standard C ones. Place a NUL at the
-end of the buffer to safety-stop C-string reads from it. */
+call the local functions instead of the standard C ones. */
-if (!(smtp_inbuffer = US malloc(IN_BUFFER_SIZE)))
- log_write(0, LOG_MAIN|LOG_PANIC_DIE, "malloc() failed for SMTP input buffer");
-smtp_inbuffer[IN_BUFFER_SIZE-1] = '\0';
+smtp_buf_init();
receive_getc = smtp_getc;
receive_getbuf = smtp_getbuf;
receive_get_cache = smtp_get_cache;
+receive_hasc = smtp_hasc;
receive_ungetc = smtp_ungetc;
receive_feof = smtp_feof;
receive_ferror = smtp_ferror;
-receive_smtp_buffered = smtp_buffered;
-smtp_inptr = smtp_inend = smtp_inbuffer;
-smtp_had_eof = smtp_had_error = 0;
+lwr_receive_getc = NULL;
+lwr_receive_getbuf = NULL;
+lwr_receive_hasc = NULL;
+lwr_receive_ungetc = NULL;
/* Set up the message size limit; this may be host-specific */
+GET_OPTION("message_size_limit");
thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
if (expand_string_message)
{
If smtp_accept_max and smtp_accept_reserve are set, keep some connections in
reserve for certain hosts and/or networks. */
-if (!sender_host_unknown)
+if (!f.sender_host_unknown)
{
int rc;
BOOL reserved_host = FALSE;
How to do this properly in IPv6 is not yet known. */
- #if !HAVE_IPV6 && !defined(NO_IP_OPTIONS)
-
- #ifdef GLIBC_IP_OPTIONS
- #if (!defined __GLIBC__) || (__GLIBC__ < 2)
- #define OPTSTYLE 1
- #else
- #define OPTSTYLE 2
- #endif
- #elif defined DARWIN_IP_OPTIONS
- #define OPTSTYLE 2
- #else
- #define OPTSTYLE 3
- #endif
+#if !HAVE_IPV6 && !defined(NO_IP_OPTIONS)
+
+# ifdef GLIBC_IP_OPTIONS
+# if (!defined __GLIBC__) || (__GLIBC__ < 2)
+# define OPTSTYLE 1
+# else
+# define OPTSTYLE 2
+# endif
+# elif defined DARWIN_IP_OPTIONS
+# define OPTSTYLE 2
+# else
+# define OPTSTYLE 3
+# endif
- if (!host_checking && !sender_host_notsocket)
+ if (!host_checking && !f.sender_host_notsocket)
{
- #if OPTSTYLE == 1
+# if OPTSTYLE == 1
EXIM_SOCKLEN_T optlen = sizeof(struct ip_options) + MAX_IPOPTLEN;
- struct ip_options *ipopt = store_get(optlen);
- #elif OPTSTYLE == 2
+ struct ip_options *ipopt = store_get(optlen, GET_UNTAINTED);
+# elif OPTSTYLE == 2
struct ip_opts ipoptblock;
struct ip_opts *ipopt = &ipoptblock;
EXIM_SOCKLEN_T optlen = sizeof(ipoptblock);
- #else
+# else
struct ipoption ipoptblock;
struct ipoption *ipopt = &ipoptblock;
EXIM_SOCKLEN_T optlen = sizeof(ipoptblock);
- #endif
+# endif
/* Occasional genuine failures of getsockopt() have been seen - for
example, "reset by peer". Therefore, just log and give up on this
{
log_write(0, LOG_MAIN, "getsockopt() failed from %s: %s",
host_and_ident(FALSE), strerror(errno));
- smtp_printf("451 SMTP service not available\r\n", FALSE);
+ smtp_printf("451 SMTP service not available\r\n", SP_NO_MORE);
return FALSE;
}
}
else if (optlen > 0)
{
- uschar *p = big_buffer;
- uschar *pend = big_buffer + big_buffer_size;
- uschar *opt, *adptr;
+ uschar * p = big_buffer;
+ uschar * pend = big_buffer + big_buffer_size;
+ uschar * adptr;
int optcount;
struct in_addr addr;
- #if OPTSTYLE == 1
- uschar *optstart = US (ipopt->__data);
- #elif OPTSTYLE == 2
- uschar *optstart = US (ipopt->ip_opts);
- #else
- uschar *optstart = US (ipopt->ipopt_list);
- #endif
+# if OPTSTYLE == 1
+ uschar * optstart = US (ipopt->__data);
+# elif OPTSTYLE == 2
+ uschar * optstart = US (ipopt->ip_opts);
+# else
+ uschar * optstart = US (ipopt->ipopt_list);
+# endif
DEBUG(D_receive) debug_printf("IP options exist\n");
Ustrcpy(p, "IP options on incoming call:");
p += Ustrlen(p);
- for (opt = optstart; opt != NULL &&
- opt < US (ipopt) + optlen;)
- {
+ for (uschar * opt = optstart; opt && opt < US (ipopt) + optlen; )
switch (*opt)
{
case IPOPT_EOL:
- opt = NULL;
- break;
+ opt = NULL;
+ break;
case IPOPT_NOP:
- opt++;
- break;
+ opt++;
+ break;
case IPOPT_SSRR:
case IPOPT_LSRR:
- if (!string_format(p, pend-p, " %s [@%s",
- (*opt == IPOPT_SSRR)? "SSRR" : "LSRR",
- #if OPTSTYLE == 1
- inet_ntoa(*((struct in_addr *)(&(ipopt->faddr))))))
- #elif OPTSTYLE == 2
- inet_ntoa(ipopt->ip_dst)))
- #else
- inet_ntoa(ipopt->ipopt_dst)))
- #endif
- {
- opt = NULL;
- break;
- }
-
- p += Ustrlen(p);
- optcount = (opt[1] - 3) / sizeof(struct in_addr);
- adptr = opt + 3;
- while (optcount-- > 0)
- {
- memcpy(&addr, adptr, sizeof(addr));
- if (!string_format(p, pend - p - 1, "%s%s",
- (optcount == 0)? ":" : "@", inet_ntoa(addr)))
- {
- opt = NULL;
- break;
- }
- p += Ustrlen(p);
- adptr += sizeof(struct in_addr);
- }
- *p++ = ']';
- opt += opt[1];
- break;
+ if (!
+# if OPTSTYLE == 1
+ string_format(p, pend-p, " %s [@%s",
+ (*opt == IPOPT_SSRR)? "SSRR" : "LSRR",
+ inet_ntoa(*((struct in_addr *)(&(ipopt->faddr)))))
+# elif OPTSTYLE == 2
+ string_format(p, pend-p, " %s [@%s",
+ (*opt == IPOPT_SSRR)? "SSRR" : "LSRR",
+ inet_ntoa(ipopt->ip_dst))
+# else
+ string_format(p, pend-p, " %s [@%s",
+ (*opt == IPOPT_SSRR)? "SSRR" : "LSRR",
+ inet_ntoa(ipopt->ipopt_dst))
+# endif
+ )
+ {
+ opt = NULL;
+ break;
+ }
+
+ p += Ustrlen(p);
+ optcount = (opt[1] - 3) / sizeof(struct in_addr);
+ adptr = opt + 3;
+ while (optcount-- > 0)
+ {
+ memcpy(&addr, adptr, sizeof(addr));
+ if (!string_format(p, pend - p - 1, "%s%s",
+ (optcount == 0)? ":" : "@", inet_ntoa(addr)))
+ {
+ opt = NULL;
+ break;
+ }
+ p += Ustrlen(p);
+ adptr += sizeof(struct in_addr);
+ }
+ *p++ = ']';
+ opt += opt[1];
+ break;
default:
- {
- int i;
- if (pend - p < 4 + 3*opt[1]) { opt = NULL; break; }
- Ustrcat(p, "[ ");
- p += 2;
- for (i = 0; i < opt[1]; i++)
- p += sprintf(CS p, "%2.2x ", opt[i]);
- *p++ = ']';
- }
- opt += opt[1];
- break;
+ {
+ if (pend - p < 4 + 3*opt[1]) { opt = NULL; break; }
+ Ustrcat(p, "[ ");
+ p += 2;
+ for (int i = 0; i < opt[1]; i++)
+ p += sprintf(CS p, "%2.2x ", opt[i]);
+ *p++ = ']';
+ }
+ opt += opt[1];
+ break;
}
- }
*p = 0;
log_write(0, LOG_MAIN, "%s", big_buffer);
log_write(0, LOG_MAIN|LOG_REJECT,
"connection from %s refused (IP options)", host_and_ident(FALSE));
- smtp_printf("554 SMTP service not available\r\n", FALSE);
+ smtp_printf("554 SMTP service not available\r\n", SP_NO_MORE);
return FALSE;
}
else DEBUG(D_receive) debug_printf("no IP options found\n");
}
- #endif /* HAVE_IPV6 && !defined(NO_IP_OPTIONS) */
+#endif /* HAVE_IPV6 && !defined(NO_IP_OPTIONS) */
/* Set keep-alive in socket options. The option is on by default. This
setting is an attempt to get rid of some hanging connections that stick in
read() when the remote end (usually a dialup) goes away. */
- if (smtp_accept_keepalive && !sender_host_notsocket)
+ if (smtp_accept_keepalive && !f.sender_host_notsocket)
ip_keepalive(fileno(smtp_out), sender_host_address, FALSE);
/* If the current host matches host_lookup, set the name by doing a
{
log_write(L_connection_reject, LOG_MAIN|LOG_REJECT, "refused connection "
"from %s (host_reject_connection)", host_and_ident(FALSE));
- smtp_printf("554 SMTP service not available\r\n", FALSE);
+#ifndef DISABLE_TLS
+ if (!tls_in.on_connect)
+#endif
+ smtp_printf("554 SMTP service not available\r\n", SP_NO_MORE);
return FALSE;
}
log_write(L_connection_reject,
LOG_MAIN|LOG_REJECT, "refused connection from %s "
"(tcp wrappers)", host_and_ident(FALSE));
- smtp_printf("554 SMTP service not available\r\n", FALSE);
+ smtp_printf("554 SMTP service not available\r\n", SP_NO_MORE);
}
else
{
log_write(L_connection_reject,
LOG_MAIN|LOG_REJECT, "temporarily refused connection from %s "
"(tcp wrappers errno=%d)", host_and_ident(FALSE), save_errno);
- smtp_printf("451 Temporary local problem - please try later\r\n", FALSE);
+ smtp_printf("451 Temporary local problem - please try later\r\n", SP_NO_MORE);
}
return FALSE;
}
host_and_ident(FALSE), smtp_accept_count - 1, smtp_accept_max,
smtp_accept_reserve, (rc == DEFER)? " (lookup deferred)" : "");
smtp_printf("421 %s: Too many concurrent SMTP connections; "
- "please try again later\r\n", FALSE, smtp_active_hostname);
+ "please try again later\r\n", SP_NO_MORE, smtp_active_hostname);
return FALSE;
}
reserved_host = TRUE;
LOG_MAIN, "temporarily refused connection from %s: not in "
"reserve list and load average = %.2f", host_and_ident(FALSE),
(double)load_average/1000.0);
- smtp_printf("421 %s: Too much load; please try again later\r\n", FALSE,
+ smtp_printf("421 %s: Too much load; please try again later\r\n", SP_NO_MORE,
smtp_active_hostname);
return FALSE;
}
addresses in the headers. For a site that permits no qualification, this
won't take long, however. */
- allow_unqualified_sender =
+ f.allow_unqualified_sender =
verify_check_host(&sender_unqualified_hosts) == OK;
- allow_unqualified_recipient =
+ f.allow_unqualified_recipient =
verify_check_host(&recipient_unqualified_hosts) == OK;
/* Determine whether HELO/EHLO is required for this host. The requirement
can be hard or soft. */
- helo_required = verify_check_host(&helo_verify_hosts) == OK;
- if (!helo_required)
- helo_verify = verify_check_host(&helo_try_verify_hosts) == OK;
+ fl.helo_verify_required = verify_check_host(&helo_verify_hosts) == OK;
+ if (!fl.helo_verify_required)
+ fl.helo_verify = verify_check_host(&helo_try_verify_hosts) == OK;
/* Determine whether this hosts is permitted to send syntactic junk
after a HELO or EHLO command. */
- helo_accept_junk = verify_check_host(&helo_accept_junk_hosts) == OK;
+ fl.helo_accept_junk = verify_check_host(&helo_accept_junk_hosts) == OK;
}
+/* Expand recipients_max, if needed */
+ {
+ uschar * rme = expand_string(recipients_max);
+ recipients_max_expanded = atoi(CCS rme);
+ }
/* For batch SMTP input we are now done. */
if (smtp_batched_input) return TRUE;
-/* If valid Proxy Protocol source is connecting, set up session.
- * Failure will not allow any SMTP function other than QUIT. */
-
-#ifdef SUPPORT_PROXY
+#if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS) || defined(EXPERIMENTAL_XCLIENT)
proxy_session = FALSE;
-proxy_session_failed = FALSE;
-if (check_proxy_protocol_host())
- setup_proxy_protocol_host();
#endif
- /* Start up TLS if tls_on_connect is set. This is for supporting the legacy
- smtps port for use with older style SSL MTAs. */
+#ifdef SUPPORT_PROXY
+/* If valid Proxy Protocol source is connecting, set up session.
+Failure will not allow any SMTP function other than QUIT. */
-#ifdef SUPPORT_TLS
- if (tls_in.on_connect)
- {
- if (tls_server_start(tls_require_ciphers, &user_msg) != OK)
- return smtp_log_tls_fail(user_msg);
- cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE;
- }
+f.proxy_session_failed = FALSE;
+if (proxy_protocol_host())
+ {
+ os_non_restarting_signal(SIGALRM, command_timeout_handler);
+ proxy_protocol_setup();
+ }
#endif
/* Run the connect ACL if it exists */
user_msg = NULL;
+GET_OPTION("acl_smtp_connect");
if (acl_smtp_connect)
{
int rc;
if ((rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg,
&log_msg)) != OK)
{
- (void) smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg);
+#ifndef DISABLE_TLS
+ if (tls_in.on_connect)
+ log_connect_tls_drop(US"'connect' ACL", log_msg);
+ else
+#endif
+ (void) smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg);
return FALSE;
}
}
+/* Start up TLS if tls_on_connect is set. This is for supporting the legacy
+smtps port for use with older style SSL MTAs. */
+
+#ifndef DISABLE_TLS
+if (tls_in.on_connect)
+ {
+ if (tls_server_start(&user_msg) != OK)
+ return smtp_log_tls_fail(user_msg);
+ cmd_list[CL_TLAU].is_mail_cmd = TRUE;
+ }
+#endif
+
/* Output the initial message for a two-way SMTP connection. It may contain
newlines, which then cause a multi-line response to be given. */
esc = US""; /* Default extended status code */
esclen = 0; /* Length of esc */
-if (!user_msg)
- {
- if (!(s = expand_string(smtp_banner)))
- log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) "
- "failed: %s", smtp_banner, expand_string_message);
- }
-else
+if (user_msg)
{
int codelen = 3;
s = user_msg;
esclen = codelen - 4;
}
}
+else
+ {
+ GET_OPTION("smtp_banner");
+ if (!(s = expand_string(smtp_banner)))
+ {
+ log_write(0, f.expand_string_forcedfail ? LOG_MAIN : LOG_MAIN|LOG_PANIC_DIE,
+ "Expansion of \"%s\" (smtp_banner) failed: %s",
+ smtp_banner, expand_string_message);
+ /* for force-fail */
+ #ifndef DISABLE_TLS
+ if (tls_in.on_connect) tls_close(NULL, TLS_SHUTDOWN_WAIT);
+ #endif
+ return FALSE;
+ }
+ }
/* Remove any terminating newlines; might as well remove trailing space too */
p = s + Ustrlen(s);
while (p > s && isspace(p[-1])) p--;
-*p = 0;
+s = string_copyn(s, p-s);
/* It seems that CC:Mail is braindead, and assumes that the greeting message
is all contained in a single IP packet. The original code wrote out the
/* Before we write the banner, check that there is no input pending, unless
this synchronisation check is disabled. */
+#ifndef DISABLE_PIPE_CONNECT
+fl.pipe_connect_acceptable =
+ sender_host_address && verify_check_host(&pipe_connect_advertise_hosts) == OK;
+
if (!check_sync())
- {
- unsigned n = smtp_inend - smtp_inptr;
- if (n > 32) n = 32;
-
- log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol "
- "synchronization error (input sent without waiting for greeting): "
- "rejected connection from %s input=\"%s\"", host_and_ident(TRUE),
- string_printing(string_copyn(smtp_inptr, n)));
- smtp_printf("554 SMTP synchronization error\r\n", FALSE);
- return FALSE;
- }
+ if (fl.pipe_connect_acceptable)
+ f.smtp_in_early_pipe_used = TRUE;
+ else
+#else
+if (!check_sync())
+#endif
+ {
+ unsigned n = smtp_inend - smtp_inptr;
+ if (n > 128) n = 128;
+
+ log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol "
+ "synchronization error (input sent without waiting for greeting): "
+ "rejected connection from %s input=\"%s\"", host_and_ident(TRUE),
+ string_printing(string_copyn(smtp_inptr, n)));
+ smtp_printf("554 SMTP synchronization error\r\n", SP_NO_MORE);
+ return FALSE;
+ }
/* Now output the banner */
+/*XXX the ehlo-resp code does its own tls/nontls bit. Maybe subroutine that? */
-smtp_printf("%s", FALSE, string_from_gstring(ss));
+smtp_printf("%Y",
+#ifndef DISABLE_PIPE_CONNECT
+ fl.pipe_connect_acceptable && pipeline_connect_sends(),
+#else
+ SP_NO_MORE,
+#endif
+ ss);
/* Attempt to see if we sent the banner before the last ACK of the 3-way
handshake arrived. If so we must have managed a TFO. */
#ifdef TCP_FASTOPEN
-tfo_in_check();
+if (sender_host_address && !f.sender_host_notsocket) tfo_in_check();
#endif
return TRUE;
int yield = -1;
log_write(type, LOG_MAIN, "SMTP %s error in \"%s\" %s %s",
- (type == L_smtp_syntax_error)? "syntax" : "protocol",
+ type == L_smtp_syntax_error ? "syntax" : "protocol",
string_printing(smtp_cmd_buffer), host_and_ident(TRUE), errmess);
if (++synprot_error_count > smtp_max_synprot_errors)
{
yield = 1;
log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
- "syntax or protocol errors (last command was \"%s\")",
- host_and_ident(FALSE), string_printing(smtp_cmd_buffer));
+ "syntax or protocol errors (last command was \"%s\", %Y)",
+ host_and_ident(FALSE), string_printing(smtp_cmd_buffer),
+ s_connhad_log(NULL)
+ );
}
if (code > 0)
{
- smtp_printf("%d%c%s%s%s\r\n", FALSE, code, yield == 1 ? '-' : ' ',
+ smtp_printf("%d%c%s%s%s\r\n", SP_NO_MORE, code, yield == 1 ? '-' : ' ',
data ? data : US"", data ? US": " : US"", errmess);
if (yield == 1)
- smtp_printf("%d Too many syntax or protocol errors\r\n", FALSE, code);
+ smtp_printf("%d Too many syntax or protocol errors\r\n", SP_NO_MORE, code);
}
return yield;
*/
void
-smtp_respond(uschar* code, int codelen, BOOL final, uschar *msg)
+smtp_respond(uschar * code, int codelen, BOOL final, uschar * msg)
{
int esclen = 0;
uschar *esc = US"";
-if (!final && no_multiline_responses) return;
+if (!final && f.no_multiline_responses) return;
if (codelen > 4)
{
do it that way, so as not to have to mess with the code for the RCPT command,
which sometimes uses smtp_printf() and sometimes smtp_respond(). */
-if (rcpt_in_progress)
+if (fl.rcpt_in_progress)
{
- if (rcpt_smtp_response == NULL)
+ if (!rcpt_smtp_response)
rcpt_smtp_response = string_copy(msg);
- else if (rcpt_smtp_response_same &&
+ else if (fl.rcpt_smtp_response_same &&
Ustrcmp(rcpt_smtp_response, msg) != 0)
- rcpt_smtp_response_same = FALSE;
- rcpt_in_progress = FALSE;
+ fl.rcpt_smtp_response_same = FALSE;
+ fl.rcpt_in_progress = FALSE;
}
/* Now output the message, splitting it up into multiple lines if necessary.
for (;;)
{
uschar *nl = Ustrchr(msg, '\n');
- if (nl == NULL)
+ if (!nl)
{
smtp_printf("%.3s%c%.*s%s\r\n", !final, code, final ? ' ':'-', esclen, esc, msg);
return;
}
- else if (nl[1] == 0 || no_multiline_responses)
+ else if (nl[1] == 0 || f.no_multiline_responses)
{
smtp_printf("%.3s%c%.*s%.*s\r\n", !final, code, final ? ' ':'-', esclen, esc,
(int)(nl - msg), msg);
}
else
{
- smtp_printf("%.3s-%.*s%.*s\r\n", TRUE, code, esclen, esc, (int)(nl - msg), msg);
+ smtp_printf("%.3s-%.*s%.*s\r\n", SP_MORE, code, esclen, esc, (int)(nl - msg), msg);
msg = nl + 1;
- while (isspace(*msg)) msg++;
+ Uskip_whitespace(&msg);
}
}
}
smtp_message_code(uschar **code, int *codelen, uschar **msg, uschar **log_msg,
BOOL check_valid)
{
-int n;
-int ovector[3];
+uschar * match;
+int len;
-if (!msg || !*msg) return;
-
-if ((n = pcre_exec(regex_smtp_code, NULL, CS *msg, Ustrlen(*msg), 0,
- PCRE_EOPT, ovector, sizeof(ovector)/sizeof(int))) < 0) return;
+if (!msg || !*msg || !regex_match(regex_smtp_code, *msg, -1, &match))
+ return;
+len = Ustrlen(match);
if (check_valid && (*msg)[0] != (*code)[0])
{
log_write(0, LOG_MAIN|LOG_PANIC, "configured error code starts with "
"incorrect digit (expected %c) in \"%s\"", (*code)[0], *msg);
- if (log_msg != NULL && *log_msg == *msg)
- *log_msg = string_sprintf("%s %s", *code, *log_msg + ovector[1]);
+ if (log_msg && *log_msg == *msg)
+ *log_msg = string_sprintf("%s %s", *code, *log_msg + len);
}
else
{
*code = *msg;
- *codelen = ovector[1]; /* Includes final space */
+ *codelen = len; /* Includes final space */
}
-*msg += ovector[1]; /* Chop the code off the message */
+*msg += len; /* Chop the code off the message */
return;
}
*/
int
-smtp_handle_acl_fail(int where, int rc, uschar *user_msg, uschar *log_msg)
+smtp_handle_acl_fail(int where, int rc, uschar * user_msg, uschar * log_msg)
{
BOOL drop = rc == FAIL_DROP;
int codelen = 3;
uschar *smtp_code;
uschar *lognl;
uschar *sender_info = US"";
-uschar *what =
-#ifdef WITH_CONTENT_SCAN
- where == ACL_WHERE_MIME ? US"during MIME ACL checks" :
-#endif
- where == ACL_WHERE_PREDATA ? US"DATA" :
- where == ACL_WHERE_DATA ? US"after DATA" :
-#ifndef DISABLE_PRDR
- where == ACL_WHERE_PRDR ? US"after DATA PRDR" :
-#endif
- smtp_cmd_data ?
- string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_data) :
- string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]);
+uschar *what;
if (drop) rc = FAIL;
this is what should be logged, so I've changed to logging the unrewritten
address to retain backward compatibility. */
-#ifndef WITH_CONTENT_SCAN
-if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA)
-#else
-if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA || where == ACL_WHERE_MIME)
+switch (where)
+ {
+#ifdef WITH_CONTENT_SCAN
+ case ACL_WHERE_MIME: what = US"during MIME ACL checks"; break;
+#endif
+ case ACL_WHERE_PREDATA: what = US"DATA"; break;
+ case ACL_WHERE_DATA: what = US"after DATA"; break;
+#ifndef DISABLE_PRDR
+ case ACL_WHERE_PRDR: what = US"after DATA PRDR"; break;
#endif
+ default:
+ {
+ uschar * place = smtp_cmd_data ? smtp_cmd_data : US"in \"connect\" ACL";
+ int lim = 100;
+
+ if (where == ACL_WHERE_AUTH) /* avoid logging auth creds */
+ {
+ uschar * s = smtp_cmd_data;
+ Uskip_nonwhite(&s);
+ lim = s - smtp_cmd_data; /* atop after method */
+ }
+ what = string_sprintf("%s %.*s", acl_wherenames[where], lim, place);
+ }
+ }
+switch (where)
{
- sender_info = string_sprintf("F=<%s>%s%s%s%s ",
- sender_address_unrewritten ? sender_address_unrewritten : sender_address,
- sender_host_authenticated ? US" A=" : US"",
- sender_host_authenticated ? sender_host_authenticated : US"",
- sender_host_authenticated && authenticated_id ? US":" : US"",
- sender_host_authenticated && authenticated_id ? authenticated_id : US""
- );
+ case ACL_WHERE_RCPT:
+ case ACL_WHERE_DATA:
+#ifdef WITH_CONTENT_SCAN
+ case ACL_WHERE_MIME:
+#endif
+ sender_info = string_sprintf("F=<%s>%s%s%s%s ",
+ sender_address_unrewritten ? sender_address_unrewritten : sender_address,
+ sender_host_authenticated ? US" A=" : US"",
+ sender_host_authenticated ? sender_host_authenticated : US"",
+ sender_host_authenticated && authenticated_id ? US":" : US"",
+ sender_host_authenticated && authenticated_id ? authenticated_id : US""
+ );
+ break;
}
/* If there's been a sender verification failure with a specific message, and
if (sender_verified_failed &&
!testflag(sender_verified_failed, af_sverify_told))
{
- BOOL save_rcpt_in_progress = rcpt_in_progress;
- rcpt_in_progress = FALSE; /* So as not to treat these as the error */
+ BOOL save_rcpt_in_progress = fl.rcpt_in_progress;
+ fl.rcpt_in_progress = FALSE; /* So as not to treat these as the error */
setflag(sender_verified_failed, af_sverify_told);
string_sprintf(": %s", sender_verified_failed->message));
if (rc == FAIL && sender_verified_failed->user_message)
- smtp_respond(smtp_code, codelen, FALSE, string_sprintf(
+ smtp_respond(smtp_code, codelen, SR_NOT_FINAL, string_sprintf(
testflag(sender_verified_failed, af_verify_pmfail)?
"Postmaster verification failed while checking <%s>\n%s\n"
"Several RFCs state that you are required to have a postmaster\n"
sender_verified_failed->address,
sender_verified_failed->user_message));
- rcpt_in_progress = save_rcpt_in_progress;
+ fl.rcpt_in_progress = save_rcpt_in_progress;
}
/* Sort out text for logging */
rc was FAIL_DROP we drop the connection and yield 2. */
if (rc == FAIL)
- smtp_respond(smtp_code, codelen, TRUE,
+ smtp_respond(smtp_code, codelen, SR_FINAL,
user_msg ? user_msg : US"Administrative prohibition");
/* Send temporary failure response to the command. Don't give any details,
be re-implemented in a tidier fashion. */
else
- if (acl_temp_details && user_msg)
+ if (f.acl_temp_details && user_msg)
{
if ( smtp_return_error_details
&& sender_verified_failed
&& sender_verified_failed->message
)
- smtp_respond(smtp_code, codelen, FALSE, sender_verified_failed->message);
+ smtp_respond(smtp_code, codelen, SR_NOT_FINAL, sender_verified_failed->message);
- smtp_respond(smtp_code, codelen, TRUE, user_msg);
+ smtp_respond(smtp_code, codelen, SR_FINAL, user_msg);
}
else
- smtp_respond(smtp_code, codelen, TRUE,
+ smtp_respond(smtp_code, codelen, SR_FINAL,
US"Temporary local problem - please try later");
/* Log the incident to the logs that are specified by log_reject_target
the connection is not forcibly to be dropped, return 0. Otherwise, log why it
is closing if required and return 2. */
-if (log_reject_target != 0)
+if (log_reject_target)
{
-#ifdef SUPPORT_TLS
+#ifndef DISABLE_TLS
gstring * g = s_tlslog(NULL);
uschar * tls = string_from_gstring(g);
if (!tls) tls = US"";
if (!drop) return 0;
-log_write(L_smtp_connection, LOG_MAIN, "%s closed by DROP in ACL",
- smtp_get_connection_info());
+log_close_event(US"by DROP in ACL");
/* Run the not-quit ACL, but without any custom messages. This should not be a
problem, because we get here only if some other ACL has issued "drop", and
in that case, *its* custom messages will have been used above. */
smtp_notquit_exit(US"acl-drop", NULL, NULL);
+
+/* An overenthusiastic fail2ban/iptables implimentation has been seen to result
+in the TCP conn staying open, and retrying, despite this process exiting. A
+malicious client could possibly do the same, tying up server netowrking
+resources. Close the socket explicitly to try to avoid that (there's a note in
+the Linux socket(7) manpage, SO_LINGER para, to the effect that exim() without
+close() results in the socket always lingering). */
+
+(void) poll_one_fd(fileno(smtp_in), POLLIN, 200);
+DEBUG(D_any) debug_printf_indent("SMTP(close)>>\n");
+(void) fclose(smtp_in);
+(void) fclose(smtp_out);
+
return 2;
}
uschar *user_msg = NULL;
uschar *log_msg = NULL;
-/* Check for recursive acll */
+/* Check for recursive call */
-if (smtp_exit_function_called)
+if (fl.smtp_exit_function_called)
{
log_write(0, LOG_PANIC, "smtp_notquit_exit() called more than once (%s)",
reason);
return;
}
-smtp_exit_function_called = TRUE;
+fl.smtp_exit_function_called = TRUE;
/* Call the not-QUIT ACL, if there is one, unless no reason is given. */
+GET_OPTION("acl_smtp_notquit");
if (acl_smtp_notquit && reason)
{
smtp_notquit_reason = reason;
log_msg);
}
+/* If the connection was dropped, we certainly are no longer talking TLS */
+tls_in.active.sock = -1;
+
/* Write an SMTP response if we are expected to give one. As the default
-responses are all internal, they should always fit in the buffer, but code a
-warning, just in case. Note that string_vformat() still leaves a complete
-string, even if it is incomplete. */
+responses are all internal, they should be reasonable size. */
if (code && defaultrespond)
{
if (user_msg)
- smtp_respond(code, 3, TRUE, user_msg);
+ smtp_respond(code, 3, SR_FINAL, user_msg);
else
{
- uschar buffer[128];
+ gstring * g;
va_list ap;
+
va_start(ap, defaultrespond);
- if (!string_vformat(buffer, sizeof(buffer), CS defaultrespond, ap))
- log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_notquit_exit()");
- smtp_printf("%s %s\r\n", FALSE, code, buffer);
+ g = string_vformat(NULL, SVFMT_EXTEND|SVFMT_REBUFFER, CS defaultrespond, ap);
va_end(ap);
+ smtp_printf("%s %Y\r\n", SP_NO_MORE, code, g);
}
mac_smtp_fflush();
}
else if (sender_host_address == NULL)
{
HDEBUG(D_receive) debug_printf("no client IP address: assume success\n");
- helo_verified = TRUE;
+ f.helo_verified = TRUE;
}
/* Deal with the more common case when there is a sending IP address */
else if (sender_helo_name[0] == '[')
{
- helo_verified = Ustrncmp(sender_helo_name+1, sender_host_address,
+ f.helo_verified = Ustrncmp(sender_helo_name+1, sender_host_address,
Ustrlen(sender_host_address)) == 0;
- #if HAVE_IPV6
- if (!helo_verified)
+#if HAVE_IPV6
+ if (!f.helo_verified)
{
if (strncmpic(sender_host_address, US"::ffff:", 7) == 0)
- helo_verified = Ustrncmp(sender_helo_name + 1,
+ f.helo_verified = Ustrncmp(sender_helo_name + 1,
sender_host_address + 7, Ustrlen(sender_host_address) - 7) == 0;
}
- #endif
+#endif
HDEBUG(D_receive)
- { if (helo_verified) debug_printf("matched host address\n"); }
+ { if (f.helo_verified) debug_printf("matched host address\n"); }
}
/* Do a reverse lookup if one hasn't already given a positive or negative
/* If a host name is known, check it and all its aliases. */
if (sender_host_name)
- if ((helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0))
+ if ((f.helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0))
{
sender_helo_dnssec = sender_host_dnssec;
HDEBUG(D_receive) debug_printf("matched host name\n");
{
uschar **aliases = sender_host_aliases;
while (*aliases)
- if ((helo_verified = strcmpic(*aliases++, sender_helo_name) == 0))
+ if ((f.helo_verified = strcmpic(*aliases++, sender_helo_name) == 0))
{
sender_helo_dnssec = sender_host_dnssec;
break;
}
- HDEBUG(D_receive) if (helo_verified)
+ HDEBUG(D_receive) if (f.helo_verified)
debug_printf("matched alias %s\n", *(--aliases));
}
/* Final attempt: try a forward lookup of the helo name */
- if (!helo_verified)
+ if (!f.helo_verified)
{
int rc;
- host_item h;
- dnssec_domains d;
- host_item *hh;
-
- h.name = sender_helo_name;
- h.address = NULL;
- h.mx = MX_NONE;
- h.next = NULL;
- d.request = US"*";
- d.require = US"";
+ host_item h =
+ {.name = sender_helo_name, .address = NULL, .mx = MX_NONE, .next = NULL};
+ dnssec_domains d =
+ {.request = US"*", .require = US""};
HDEBUG(D_receive) debug_printf("getting IP address for %s\n",
sender_helo_name);
rc = host_find_bydns(&h, NULL, HOST_FIND_BY_A | HOST_FIND_BY_AAAA,
NULL, NULL, NULL, &d, NULL, NULL);
if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
- for (hh = &h; hh; hh = hh->next)
+ for (host_item * hh = &h; hh; hh = hh->next)
if (Ustrcmp(hh->address, sender_host_address) == 0)
{
- helo_verified = TRUE;
+ f.helo_verified = TRUE;
if (h.dnssec == DS_YES) sender_helo_dnssec = TRUE;
HDEBUG(D_receive)
- {
debug_printf("IP address for %s matches calling address\n"
"Forward DNS security status: %sverified\n",
sender_helo_name, sender_helo_dnssec ? "" : "un");
- }
break;
}
}
}
-if (!helo_verified) helo_verify_failed = TRUE; /* We've tried ... */
+if (!f.helo_verified) f.helo_verify_failed = TRUE; /* We've tried ... */
return yield;
}
{
int len = 3;
smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
-smtp_respond(code, len, TRUE, user_msg);
+smtp_respond(code, len, SR_FINAL, user_msg);
}
static int
-smtp_in_auth(auth_instance *au, uschar ** s, uschar ** ss)
+smtp_in_auth(auth_instance *au, uschar ** smtp_resp, uschar ** errmsg)
{
const uschar *set_id = NULL;
-int rc, i;
+int rc;
+
+/* Set up globals for error messages */
+
+authenticator_name = au->name;
+driver_srcfile = au->srcfile;
+driver_srcline = au->srcline;
/* Run the checking code, passing the remainder of the command line as
data. Initials the $auth<n> variables as empty. Initialize $0 empty and set
authenticated_id. Save this in permanent store, as the working store gets
reset at HELO, RSET, etc. */
-for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL;
+for (int i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL;
expand_nmax = 0;
expand_nlength[0] = 0; /* $0 contains nothing */
rc = (au->info->servercode)(au, smtp_cmd_data);
if (au->set_id) set_id = expand_string(au->set_id);
expand_nmax = -1; /* Reset numeric variables */
-for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; /* Reset $auth<n> */
+for (int i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; /* Reset $auth<n> */
+driver_srcfile = authenticator_name = NULL; driver_srcline = 0;
/* The value of authenticated_id is stored in the spool file and printed in
log lines. It must not contain binary zeros or newline characters. In
switch(rc)
{
case OK:
- if (!au->set_id || set_id) /* Complete success */
- {
- if (set_id) authenticated_id = string_copy_malloc(set_id);
- sender_host_authenticated = au->name;
- sender_host_auth_pubname = au->public_name;
- authentication_failed = FALSE;
- authenticated_fail_id = NULL; /* Impossible to already be set? */
-
- received_protocol =
- (sender_host_address ? protocols : protocols_local)
- [pextend + pauthed + (tls_in.active >= 0 ? pcrpted:0)];
- *s = *ss = US"235 Authentication succeeded";
- authenticated_by = au;
- break;
- }
+ if (!au->set_id || set_id) /* Complete success */
+ {
+ if (set_id) authenticated_id = string_copy_perm(set_id, TRUE);
+ sender_host_authenticated = au->name;
+ sender_host_auth_pubname = au->public_name;
+ authentication_failed = FALSE;
+ authenticated_fail_id = NULL; /* Impossible to already be set? */
- /* Authentication succeeded, but we failed to expand the set_id string.
- Treat this as a temporary error. */
+ received_protocol =
+ (sender_host_address ? protocols : protocols_local)
+ [pextend + pauthed + (tls_in.active.sock >= 0 ? pcrpted:0)];
+ *smtp_resp = *errmsg = US"235 Authentication succeeded";
+ authenticated_by = au;
+ break;
+ }
- auth_defer_msg = expand_string_message;
- /* Fall through */
+ /* Authentication succeeded, but we failed to expand the set_id string.
+ Treat this as a temporary error. */
+
+ auth_defer_msg = expand_string_message;
+ /* Fall through */
case DEFER:
- if (set_id) authenticated_fail_id = string_copy_malloc(set_id);
- *s = string_sprintf("435 Unable to authenticate at present%s",
- auth_defer_user_msg);
- *ss = string_sprintf("435 Unable to authenticate at present%s: %s",
- set_id, auth_defer_msg);
- break;
+ if (set_id) authenticated_fail_id = string_copy_perm(set_id, TRUE);
+ *smtp_resp = string_sprintf("435 Unable to authenticate at present%s",
+ auth_defer_user_msg);
+ *errmsg = string_sprintf("435 Unable to authenticate at present%s: %s",
+ set_id, auth_defer_msg);
+ break;
case BAD64:
- *s = *ss = US"501 Invalid base64 data";
- break;
+ *smtp_resp = *errmsg = US"501 Invalid base64 data";
+ break;
case CANCELLED:
- *s = *ss = US"501 Authentication cancelled";
- break;
+ *smtp_resp = *errmsg = US"501 Authentication cancelled";
+ break;
case UNEXPECTED:
- *s = *ss = US"553 Initial data not expected";
- break;
+ *smtp_resp = *errmsg = US"553 Initial data not expected";
+ break;
case FAIL:
- if (set_id) authenticated_fail_id = string_copy_malloc(set_id);
- *s = US"535 Incorrect authentication data";
- *ss = string_sprintf("535 Incorrect authentication data%s", set_id);
- break;
+ if (set_id) authenticated_fail_id = string_copy_perm(set_id, TRUE);
+ *smtp_resp = US"535 Incorrect authentication data";
+ *errmsg = string_sprintf("535 Incorrect authentication data%s", set_id);
+ break;
default:
- if (set_id) authenticated_fail_id = string_copy_malloc(set_id);
- *s = US"435 Internal error";
- *ss = string_sprintf("435 Internal error%s: return %d from authentication "
- "check", set_id, rc);
- break;
+ if (set_id) authenticated_fail_id = string_copy_perm(set_id, TRUE);
+ *smtp_resp = US"435 Internal error";
+ *errmsg = string_sprintf("435 Internal error%s: return %d from authentication "
+ "check", set_id, rc);
+ break;
}
return rc;
qualify_recipient(uschar ** recipient, uschar * smtp_cmd_data, uschar * tag)
{
int rd;
-if (allow_unqualified_recipient || strcmpic(*recipient, US"postmaster") == 0)
+if (f.allow_unqualified_recipient || strcmpic(*recipient, US"postmaster") == 0)
{
DEBUG(D_receive) debug_printf("unqualified address %s accepted\n",
*recipient);
rd = Ustrlen(recipient) + 1;
- *recipient = rewrite_address_qualify(*recipient, TRUE);
+ /* deconst ok as *recipient was not const */
+ *recipient = US rewrite_address_qualify(*recipient, TRUE);
return rd;
}
-smtp_printf("501 %s: recipient address must contain a domain\r\n", FALSE,
+smtp_printf("501 %s: recipient address must contain a domain\r\n", SP_NO_MORE,
smtp_cmd_data);
log_write(L_smtp_syntax_error,
LOG_MAIN|LOG_REJECT, "unqualified %s rejected: <%s> %s%s",
smtp_quit_handler(uschar ** user_msgp, uschar ** log_msgp)
{
HAD(SCH_QUIT);
+f.smtp_in_quit = TRUE;
incomplete_transaction_log(US"QUIT");
-if (acl_smtp_quit)
- {
- int rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, user_msgp, log_msgp);
- if (rc == ERROR)
+GET_OPTION("acl_smtp_quit");
+if ( acl_smtp_quit
+ && acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, user_msgp, log_msgp)
+ == ERROR)
log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
*log_msgp);
- }
+
+#ifdef EXIM_TCP_CORK
+(void) setsockopt(fileno(smtp_out), IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
+#endif
+
if (*user_msgp)
- smtp_respond(US"221", 3, TRUE, *user_msgp);
+ smtp_respond(US"221", 3, SR_FINAL, *user_msgp);
else
- smtp_printf("221 %s closing connection\r\n", FALSE, smtp_active_hostname);
+ smtp_printf("221 %s closing connection\r\n", SP_NO_MORE, smtp_active_hostname);
-#ifdef SUPPORT_TLS
-tls_close(TRUE, TLS_SHUTDOWN_NOWAIT);
-#endif
+#ifdef SERVERSIDE_CLOSE_NOWAIT
+# ifndef DISABLE_TLS
+tls_close(NULL, TLS_SHUTDOWN_NOWAIT);
+# endif
-log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT",
- smtp_get_connection_info());
+log_close_event(US"by QUIT");
+#else
+
+# ifndef DISABLE_TLS
+tls_close(NULL, TLS_SHUTDOWN_WAIT);
+# endif
+
+log_close_event(US"by QUIT");
+
+/* Pause, hoping client will FIN first so that they get the TIME_WAIT.
+The socket should become readble (though with no data) */
+
+(void) poll_one_fd(fileno(smtp_in), POLLIN, 200);
+#endif /*!SERVERSIDE_CLOSE_NOWAIT*/
}
{
HAD(SCH_RSET);
incomplete_transaction_log(US"RSET");
-smtp_printf("250 Reset OK\r\n", FALSE);
-cmd_list[CMD_LIST_RSET].is_mail_cmd = FALSE;
+smtp_printf("250 Reset OK\r\n", SP_NO_MORE);
+cmd_list[CL_RSET].is_mail_cmd = FALSE;
+if (chunking_state > CHUNKING_OFFERED)
+ chunking_state = CHUNKING_OFFERED;
}
+static int
+expand_mailmax(const uschar * s)
+{
+if (!(s = expand_cstring(s)))
+ log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand smtp_accept_max_per_connection");
+return *s ? Uatoi(s) : 0;
+}
/*************************************************
* Initialize for SMTP incoming message *
BOOL discarded = FALSE;
BOOL last_was_rej_mail = FALSE;
BOOL last_was_rcpt = FALSE;
-void *reset_point = store_get(0);
+rmark reset_point = store_mark();
DEBUG(D_receive) debug_printf("smtp_setup_msg entered\n");
TLS between messages (an Exim client may do this if it has messages queued up
for the host). Note: we do NOT reset AUTH at this point. */
-smtp_reset(reset_point);
+reset_point = smtp_reset(reset_point);
message_ended = END_NOTSTARTED;
-chunking_state = chunking_offered ? CHUNKING_OFFERED : CHUNKING_NOT_OFFERED;
+chunking_state = f.chunking_offered ? CHUNKING_OFFERED : CHUNKING_NOT_OFFERED;
-cmd_list[CMD_LIST_RSET].is_mail_cmd = TRUE;
-cmd_list[CMD_LIST_HELO].is_mail_cmd = TRUE;
-cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE;
-#ifdef SUPPORT_TLS
-cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = TRUE;
+cmd_list[CL_RSET].is_mail_cmd = TRUE;
+cmd_list[CL_HELO].is_mail_cmd = TRUE;
+cmd_list[CL_EHLO].is_mail_cmd = TRUE;
+#ifndef DISABLE_TLS
+cmd_list[CL_STLS].is_mail_cmd = TRUE;
#endif
+if (lwr_receive_getc != NULL)
+ {
+ /* This should have already happened, but if we've gotten confused,
+ force a reset here. */
+ DEBUG(D_receive) debug_printf("WARNING: smtp_setup_msg had to restore receive functions to lowers\n");
+ bdat_pop_receive_functions();
+ }
+
/* Set the local signal handler for SIGTERM - it tries to end off tidily */
+had_command_sigterm = 0;
os_non_restarting_signal(SIGTERM, command_sigterm_handler);
/* Batched SMTP is handled in a different function. */
if (smtp_batched_input) return smtp_setup_batch_msg();
+#ifdef TCP_QUICKACK
+if (smtp_in) /* Avoid pure-ACKs while in cmd pingpong phase */
+ (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK,
+ US &off, sizeof(off));
+#endif
+
/* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE
value. The values are 2 larger than the required yield of the function. */
int start, end, sender_domain, recipient_domain;
int rc;
int c;
- auth_instance *au;
uschar *orcpt = NULL;
- int flags;
+ int dsn_flags;
gstring * g;
#ifdef AUTH_TLS
/* Check once per STARTTLS or SSL-on-connect for a TLS AUTH */
- if ( tls_in.active >= 0
+ if ( tls_in.active.sock >= 0
&& tls_in.peercert
&& tls_in.certificate_verified
- && cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd
+ && cmd_list[CL_TLAU].is_mail_cmd
)
{
- cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = FALSE;
+ cmd_list[CL_TLAU].is_mail_cmd = FALSE;
- for (au = auths; au; au = au->next)
+ for (auth_instance * au = auths; au; au = au->next)
if (strcmpic(US"tls", au->driver_name) == 0)
{
+ GET_OPTION("acl_smtp_auth");
if ( acl_smtp_auth
&& (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth,
&user_msg, &log_msg)) != OK
if (smtp_in_auth(au, &s, &ss) == OK)
{ DEBUG(D_auth) debug_printf("tls auth succeeded\n"); }
else
- { DEBUG(D_auth) debug_printf("tls auth not succeeded\n"); }
+ {
+ DEBUG(D_auth) debug_printf("tls auth not succeeded\n");
+#ifndef DISABLE_EVENT
+ {
+ uschar * save_name = sender_host_authenticated, * logmsg;
+ sender_host_authenticated = au->name;
+ if ((logmsg = event_raise(event_action, US"auth:fail", s, NULL)))
+ log_write(0, LOG_MAIN, "%s", logmsg);
+ sender_host_authenticated = save_name;
+ }
+#endif
+ }
}
break;
}
}
#endif
-#ifdef TCP_QUICKACK
- if (smtp_in) /* Avoid pure-ACKs while in cmd pingpong phase */
- (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK,
- US &off, sizeof(off));
+ switch(smtp_read_command(
+#ifndef DISABLE_PIPE_CONNECT
+ !fl.pipe_connect_acceptable,
+#else
+ TRUE,
#endif
-
- switch(smtp_read_command(TRUE, GETC_BUFFER_UNLIMITED))
+ GETC_BUFFER_UNLIMITED))
{
/* The AUTH command is not permitted to occur inside a transaction, and may
occur successfully only once per connection. Actually, that isn't quite
AUTHS will eventually hit the nonmail threshold. */
case AUTH_CMD:
- HAD(SCH_AUTH);
- authentication_failed = TRUE;
- cmd_list[CMD_LIST_AUTH].is_mail_cmd = FALSE;
+ HAD(SCH_AUTH);
+ authentication_failed = TRUE;
+ cmd_list[CL_AUTH].is_mail_cmd = FALSE;
- if (!auth_advertised && !allow_auth_unadvertised)
- {
- done = synprot_error(L_smtp_protocol_error, 503, NULL,
- US"AUTH command used when not advertised");
- break;
- }
- if (sender_host_authenticated)
- {
- done = synprot_error(L_smtp_protocol_error, 503, NULL,
- US"already authenticated");
- break;
- }
- if (sender_address)
- {
- done = synprot_error(L_smtp_protocol_error, 503, NULL,
- US"not permitted in mail transaction");
- break;
- }
+ if (!fl.auth_advertised && !f.allow_auth_unadvertised)
+ {
+ done = synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"AUTH command used when not advertised");
+ break;
+ }
+ if (sender_host_authenticated)
+ {
+ done = synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"already authenticated");
+ break;
+ }
+ if (sender_address)
+ {
+ done = synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"not permitted in mail transaction");
+ break;
+ }
- /* Check the ACL */
+ /* Check the ACL */
- if ( acl_smtp_auth
- && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth,
- &user_msg, &log_msg)) != OK
- )
- {
- done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg);
- break;
- }
+ GET_OPTION("acl_smtp_auth");
+ if ( acl_smtp_auth
+ && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth,
+ &user_msg, &log_msg)) != OK
+ )
+ {
+ done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg);
+ break;
+ }
- /* Find the name of the requested authentication mechanism. */
+ /* Find the name of the requested authentication mechanism. */
- s = smtp_cmd_data;
- while ((c = *smtp_cmd_data) != 0 && !isspace(c))
- {
- if (!isalnum(c) && c != '-' && c != '_')
- {
- done = synprot_error(L_smtp_syntax_error, 501, NULL,
- US"invalid character in authentication mechanism name");
- goto COMMAND_LOOP;
- }
- smtp_cmd_data++;
- }
+ s = smtp_cmd_data;
+ for (; (c = *smtp_cmd_data) && !isspace(c); smtp_cmd_data++)
+ if (!isalnum(c) && c != '-' && c != '_')
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"invalid character in authentication mechanism name");
+ goto COMMAND_LOOP;
+ }
- /* If not at the end of the line, we must be at white space. Terminate the
- name and move the pointer on to any data that may be present. */
+ /* If not at the end of the line, we must be at white space. Terminate the
+ name and move the pointer on to any data that may be present. */
- if (*smtp_cmd_data != 0)
- {
- *smtp_cmd_data++ = 0;
- while (isspace(*smtp_cmd_data)) smtp_cmd_data++;
- }
+ if (*smtp_cmd_data)
+ {
+ *smtp_cmd_data++ = '\0';
+ Uskip_whitespace(&smtp_cmd_data);
+ }
- /* Search for an authentication mechanism which is configured for use
- as a server and which has been advertised (unless, sigh, allow_auth_
- unadvertised is set). */
+ /* Search for an authentication mechanism which is configured for use
+ as a server and which has been advertised (unless, sigh, allow_auth_
+ unadvertised is set). */
- for (au = auths; au; au = au->next)
- if (strcmpic(s, au->public_name) == 0 && au->server &&
- (au->advertised || allow_auth_unadvertised))
- break;
+ {
+ auth_instance * au;
+ uschar * smtp_resp, * errmsg;
- if (au)
- {
- c = smtp_in_auth(au, &s, &ss);
+ for (au = auths; au; au = au->next)
+ if (strcmpic(s, au->public_name) == 0 && au->server &&
+ (au->advertised || f.allow_auth_unadvertised))
+ break;
- smtp_printf("%s\r\n", FALSE, s);
- if (c != OK)
- log_write(0, LOG_MAIN|LOG_REJECT, "%s authenticator failed for %s: %s",
- au->name, host_and_ident(FALSE), ss);
- }
- else
- done = synprot_error(L_smtp_protocol_error, 504, NULL,
- string_sprintf("%s authentication mechanism not supported", s));
+ if (au)
+ {
+ int rc = smtp_in_auth(au, &smtp_resp, &errmsg);
+
+ smtp_printf("%s\r\n", SP_NO_MORE, smtp_resp);
+ if (rc != OK)
+ {
+ uschar * logmsg = NULL;
+#ifndef DISABLE_EVENT
+ {uschar * save_name = sender_host_authenticated;
+ sender_host_authenticated = au->name;
+ logmsg = event_raise(event_action, US"auth:fail", smtp_resp, NULL);
+ sender_host_authenticated = save_name;
+ }
+#endif
+ if (logmsg)
+ log_write(0, LOG_MAIN|LOG_REJECT, "%s", logmsg);
+ else
+ log_write(0, LOG_MAIN|LOG_REJECT, "%s authenticator failed for %s: %s",
+ au->name, host_and_ident(FALSE), errmsg);
+ }
+ }
+ else
+ done = synprot_error(L_smtp_protocol_error, 504, NULL,
+ string_sprintf("%s authentication mechanism not supported", s));
+ }
- break; /* AUTH_CMD */
+ break; /* AUTH_CMD */
/* The HELO/EHLO commands are permitted to appear in the middle of a
session as well as at the beginning. They have the effect of a reset in
it did the reset first. */
case HELO_CMD:
- HAD(SCH_HELO);
- hello = US"HELO";
- esmtp = FALSE;
- goto HELO_EHLO;
+ HAD(SCH_HELO);
+ hello = US"HELO";
+ fl.esmtp = FALSE;
+ goto HELO_EHLO;
case EHLO_CMD:
- HAD(SCH_EHLO);
- hello = US"EHLO";
- esmtp = TRUE;
+ HAD(SCH_EHLO);
+ hello = US"EHLO";
+ fl.esmtp = TRUE;
HELO_EHLO: /* Common code for HELO and EHLO */
- cmd_list[CMD_LIST_HELO].is_mail_cmd = FALSE;
- cmd_list[CMD_LIST_EHLO].is_mail_cmd = FALSE;
+ cmd_list[CL_HELO].is_mail_cmd = FALSE;
+ cmd_list[CL_EHLO].is_mail_cmd = FALSE;
- /* Reject the HELO if its argument was invalid or non-existent. A
- successful check causes the argument to be saved in malloc store. */
+ /* Reject the HELO if its argument was invalid or non-existent. A
+ successful check causes the argument to be saved in malloc store. */
- if (!check_helo(smtp_cmd_data))
- {
- smtp_printf("501 Syntactically invalid %s argument(s)\r\n", FALSE, hello);
+ if (!check_helo(smtp_cmd_data))
+ {
+ smtp_printf("501 Syntactically invalid %s argument(s)\r\n", SP_NO_MORE, hello);
- log_write(0, LOG_MAIN|LOG_REJECT, "rejected %s from %s: syntactically "
- "invalid argument(s): %s", hello, host_and_ident(FALSE),
- (*smtp_cmd_argument == 0)? US"(no argument given)" :
- string_printing(smtp_cmd_argument));
+ log_write(0, LOG_MAIN|LOG_REJECT, "rejected %s from %s: syntactically "
+ "invalid argument(s): %s", hello, host_and_ident(FALSE),
+ *smtp_cmd_argument == 0 ? US"(no argument given)" :
+ string_printing(smtp_cmd_argument));
- if (++synprot_error_count > smtp_max_synprot_errors)
- {
- log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
- "syntax or protocol errors (last command was \"%s\")",
- host_and_ident(FALSE), string_printing(smtp_cmd_buffer));
- done = 1;
- }
+ if (++synprot_error_count > smtp_max_synprot_errors)
+ {
+ log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
+ "syntax or protocol errors (last command was \"%s\", %Y)",
+ host_and_ident(FALSE), string_printing(smtp_cmd_buffer),
+ s_connhad_log(NULL)
+ );
+ done = 1;
+ }
- break;
- }
+ break;
+ }
- /* If sender_host_unknown is true, we have got here via the -bs interface,
- not called from inetd. Otherwise, we are running an IP connection and the
- host address will be set. If the helo name is the primary name of this
- host and we haven't done a reverse lookup, force one now. If helo_required
- is set, ensure that the HELO name matches the actual host. If helo_verify
- is set, do the same check, but softly. */
+ /* If sender_host_unknown is true, we have got here via the -bs interface,
+ not called from inetd. Otherwise, we are running an IP connection and the
+ host address will be set. If the helo name is the primary name of this
+ host and we haven't done a reverse lookup, force one now. If helo_verify_required
+ is set, ensure that the HELO name matches the actual host. If helo_verify
+ is set, do the same check, but softly. */
- if (!sender_host_unknown)
- {
- BOOL old_helo_verified = helo_verified;
- uschar *p = smtp_cmd_data;
+ if (!f.sender_host_unknown)
+ {
+ BOOL old_helo_verified = f.helo_verified;
+ uschar * p = smtp_cmd_data;
- while (*p != 0 && !isspace(*p)) { *p = tolower(*p); p++; }
- *p = 0;
+ while (*p && !isspace(*p)) { *p = tolower(*p); p++; }
+ *p = '\0';
- /* Force a reverse lookup if HELO quoted something in helo_lookup_domains
- because otherwise the log can be confusing. */
+ /* Force a reverse lookup if HELO quoted something in helo_lookup_domains
+ because otherwise the log can be confusing. */
- if ( !sender_host_name
- && (deliver_domain = sender_helo_name, /* set $domain */
- match_isinlist(sender_helo_name, CUSS &helo_lookup_domains, 0,
- &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL)) == OK)
- (void)host_name_lookup();
+ if ( !sender_host_name
+ && match_isinlist(sender_helo_name, CUSS &helo_lookup_domains, 0,
+ &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
+ (void)host_name_lookup();
- /* Rebuild the fullhost info to include the HELO name (and the real name
- if it was looked up.) */
+ /* Rebuild the fullhost info to include the HELO name (and the real name
+ if it was looked up.) */
- host_build_sender_fullhost(); /* Rebuild */
- set_process_info("handling%s incoming connection from %s",
- (tls_in.active >= 0)? " TLS" : "", host_and_ident(FALSE));
+ host_build_sender_fullhost(); /* Rebuild */
+ set_process_info("handling%s incoming connection from %s",
+ tls_in.active.sock >= 0 ? " TLS" : "", host_and_ident(FALSE));
- /* Verify if configured. This doesn't give much security, but it does
- make some people happy to be able to do it. If helo_required is set,
- (host matches helo_verify_hosts) failure forces rejection. If helo_verify
- is set (host matches helo_try_verify_hosts), it does not. This is perhaps
- now obsolescent, since the verification can now be requested selectively
- at ACL time. */
+ /* Verify if configured. This doesn't give much security, but it does
+ make some people happy to be able to do it. If helo_verify_required is set,
+ (host matches helo_verify_hosts) failure forces rejection. If helo_verify
+ is set (host matches helo_try_verify_hosts), it does not. This is perhaps
+ now obsolescent, since the verification can now be requested selectively
+ at ACL time. */
- helo_verified = helo_verify_failed = sender_helo_dnssec = FALSE;
- if (helo_required || helo_verify)
- {
- BOOL tempfail = !smtp_verify_helo();
- if (!helo_verified)
- {
- if (helo_required)
- {
- smtp_printf("%d %s argument does not match calling host\r\n", FALSE,
- tempfail? 451 : 550, hello);
- log_write(0, LOG_MAIN|LOG_REJECT, "%srejected \"%s %s\" from %s",
- tempfail? "temporarily " : "",
- hello, sender_helo_name, host_and_ident(FALSE));
- helo_verified = old_helo_verified;
- break; /* End of HELO/EHLO processing */
- }
- HDEBUG(D_all) debug_printf("%s verification failed but host is in "
- "helo_try_verify_hosts\n", hello);
- }
- }
- }
+ f.helo_verified = f.helo_verify_failed = sender_helo_dnssec = FALSE;
+ if (fl.helo_verify_required || fl.helo_verify)
+ {
+ BOOL tempfail = !smtp_verify_helo();
+ if (!f.helo_verified)
+ {
+ if (fl.helo_verify_required)
+ {
+ smtp_printf("%d %s argument does not match calling host\r\n", SP_NO_MORE,
+ tempfail? 451 : 550, hello);
+ log_write(0, LOG_MAIN|LOG_REJECT, "%srejected \"%s %s\" from %s",
+ tempfail? "temporarily " : "",
+ hello, sender_helo_name, host_and_ident(FALSE));
+ f.helo_verified = old_helo_verified;
+ break; /* End of HELO/EHLO processing */
+ }
+ HDEBUG(D_all) debug_printf("%s verification failed but host is in "
+ "helo_try_verify_hosts\n", hello);
+ }
+ }
+ }
#ifdef SUPPORT_SPF
- /* set up SPF context */
- spf_init(sender_helo_name, sender_host_address);
+ /* set up SPF context */
+ spf_conn_init(sender_helo_name, sender_host_address);
#endif
- /* Apply an ACL check if one is defined; afterwards, recheck
- synchronization in case the client started sending in a delay. */
+ /* Apply an ACL check if one is defined; afterwards, recheck
+ synchronization in case the client started sending in a delay. */
- if (acl_smtp_helo)
- if ((rc = acl_check(ACL_WHERE_HELO, NULL, acl_smtp_helo,
- &user_msg, &log_msg)) != OK)
- {
- done = smtp_handle_acl_fail(ACL_WHERE_HELO, rc, user_msg, log_msg);
- if (sender_helo_name)
+ GET_OPTION("acl_smtp_helo");
+ if (acl_smtp_helo)
+ if ((rc = acl_check(ACL_WHERE_HELO, NULL, acl_smtp_helo,
+ &user_msg, &log_msg)) != OK)
{
- store_free(sender_helo_name);
+ done = smtp_handle_acl_fail(ACL_WHERE_HELO, rc, user_msg, log_msg);
sender_helo_name = NULL;
+ host_build_sender_fullhost(); /* Rebuild */
+ break;
}
- host_build_sender_fullhost(); /* Rebuild */
- break;
- }
- else if (!check_sync()) goto SYNC_FAILURE;
-
- /* Generate an OK reply. The default string includes the ident if present,
- and also the IP address if present. Reflecting back the ident is intended
- as a deterrent to mail forgers. For maximum efficiency, and also because
- some broken systems expect each response to be in a single packet, arrange
- that the entire reply is sent in one write(). */
-
- auth_advertised = FALSE;
- pipelining_advertised = FALSE;
-#ifdef SUPPORT_TLS
- tls_advertised = FALSE;
+#ifndef DISABLE_PIPE_CONNECT
+ else if (!fl.pipe_connect_acceptable && !check_sync())
+#else
+ else if (!check_sync())
#endif
- dsn_advertised = FALSE;
+ goto SYNC_FAILURE;
+
+ /* Generate an OK reply. The default string includes the ident if present,
+ and also the IP address if present. Reflecting back the ident is intended
+ as a deterrent to mail forgers. For maximum efficiency, and also because
+ some broken systems expect each response to be in a single packet, arrange
+ that the entire reply is sent in one write(). */
+
+ fl.auth_advertised = FALSE;
+ f.smtp_in_pipelining_advertised = FALSE;
+#ifndef DISABLE_TLS
+ fl.tls_advertised = FALSE;
+#endif
+ fl.dsn_advertised = FALSE;
#ifdef SUPPORT_I18N
- smtputf8_advertised = FALSE;
+ fl.smtputf8_advertised = FALSE;
#endif
- smtp_code = US"250 "; /* Default response code plus space*/
- if (!user_msg)
- {
- s = string_sprintf("%.3s %s Hello %s%s%s",
- smtp_code,
- smtp_active_hostname,
- sender_ident ? sender_ident : US"",
- sender_ident ? US" at " : US"",
- sender_host_name ? sender_host_name : sender_helo_name);
- g = string_cat(NULL, s);
-
- if (sender_host_address)
- {
- g = string_catn(g, US" [", 2);
- g = string_cat (g, sender_host_address);
- g = string_catn(g, US"]", 1);
- }
- }
+ /* Expand the per-connection message count limit option */
+ smtp_mailcmd_max = expand_mailmax(smtp_accept_max_per_connection);
- /* A user-supplied EHLO greeting may not contain more than one line. Note
- that the code returned by smtp_message_code() includes the terminating
- whitespace character. */
+ smtp_code = US"250 "; /* Default response code plus space*/
+ if (!user_msg)
+ {
+ /* sender_host_name below will be tainted, so save on copy when we hit it */
+ g = string_get_tainted(24, GET_TAINTED);
+ g = string_fmt_append(g, "%.3s %s Hello %s%s%s",
+ smtp_code,
+ smtp_active_hostname,
+ sender_ident ? sender_ident : US"",
+ sender_ident ? US" at " : US"",
+ sender_host_name ? sender_host_name : sender_helo_name);
+
+ if (sender_host_address)
+ g = string_fmt_append(g, " [%s]", sender_host_address);
+ }
- else
- {
- char *ss;
- int codelen = 4;
- smtp_message_code(&smtp_code, &codelen, &user_msg, NULL, TRUE);
- s = string_sprintf("%.*s%s", codelen, smtp_code, user_msg);
- if ((ss = strpbrk(CS s, "\r\n")) != NULL)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "EHLO/HELO response must not contain "
- "newlines: message truncated: %s", string_printing(s));
- *ss = 0;
- }
- g = string_cat(NULL, s);
- }
+ /* A user-supplied EHLO greeting may not contain more than one line. Note
+ that the code returned by smtp_message_code() includes the terminating
+ whitespace character. */
- g = string_catn(g, US"\r\n", 2);
+ else
+ {
+ char * ss;
+ int codelen = 4;
+ smtp_message_code(&smtp_code, &codelen, &user_msg, NULL, TRUE);
+ s = string_sprintf("%.*s%s", codelen, smtp_code, user_msg);
+ if ((ss = strpbrk(CS s, "\r\n")) != NULL)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "EHLO/HELO response must not contain "
+ "newlines: message truncated: %s", string_printing(s));
+ *ss = 0;
+ }
+ g = string_cat(NULL, s);
+ }
- /* If we received EHLO, we must create a multiline response which includes
- the functions supported. */
+ g = string_catn(g, US"\r\n", 2);
- if (esmtp)
- {
- g->s[3] = '-';
+ /* If we received EHLO, we must create a multiline response which includes
+ the functions supported. */
- /* I'm not entirely happy with this, as an MTA is supposed to check
- that it has enough room to accept a message of maximum size before
- it sends this. However, there seems little point in not sending it.
- The actual size check happens later at MAIL FROM time. By postponing it
- till then, VRFY and EXPN can be used after EHLO when space is short. */
+ if (fl.esmtp)
+ {
+ g->s[3] = '-'; /* overwrite the space after the SMTP response code */
- if (thismessage_size_limit > 0)
- {
- sprintf(CS big_buffer, "%.3s-SIZE %d\r\n", smtp_code,
- thismessage_size_limit);
- g = string_cat(g, big_buffer);
- }
- else
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-SIZE\r\n", 7);
- }
+ /* I'm not entirely happy with this, as an MTA is supposed to check
+ that it has enough room to accept a message of maximum size before
+ it sends this. However, there seems little point in not sending it.
+ The actual size check happens later at MAIL FROM time. By postponing it
+ till then, VRFY and EXPN can be used after EHLO when space is short. */
- /* Exim does not do protocol conversion or data conversion. It is 8-bit
- clean; if it has an 8-bit character in its hand, it just sends it. It
- cannot therefore specify 8BITMIME and remain consistent with the RFCs.
- However, some users want this option simply in order to stop MUAs
- mangling messages that contain top-bit-set characters. It is therefore
- provided as an option. */
+ if (thismessage_size_limit > 0)
+ g = string_fmt_append(g, "%.3s-SIZE %d\r\n", smtp_code,
+ thismessage_size_limit);
+ else
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-SIZE\r\n", 7);
+ }
- if (accept_8bitmime)
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-8BITMIME\r\n", 11);
- }
+#ifndef DISABLE_ESMTP_LIMITS
+ if ( (smtp_mailcmd_max > 0 || recipients_max_expanded > 0)
+ && verify_check_host(&limits_advertise_hosts) == OK)
+ {
+ g = string_fmt_append(g, "%.3s-LIMITS", smtp_code);
+ if (smtp_mailcmd_max > 0)
+ g = string_fmt_append(g, " MAILMAX=%d", smtp_mailcmd_max);
+ if (recipients_max_expanded > 0)
+ g = string_fmt_append(g, " RCPTMAX=%d", recipients_max_expanded);
+ g = string_catn(g, US"\r\n", 2);
+ }
+#endif
- /* Advertise DSN support if configured to do so. */
- if (verify_check_host(&dsn_advertise_hosts) != FAIL)
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-DSN\r\n", 6);
- dsn_advertised = TRUE;
- }
+ /* Exim does not do protocol conversion or data conversion. It is 8-bit
+ clean; if it has an 8-bit character in its hand, it just sends it. It
+ cannot therefore specify 8BITMIME and remain consistent with the RFCs.
+ However, some users want this option simply in order to stop MUAs
+ mangling messages that contain top-bit-set characters. It is therefore
+ provided as an option. */
- /* Advertise ETRN/VRFY/EXPN if there's are ACL checking whether a host is
- permitted to issue them; a check is made when any host actually tries. */
+ if (accept_8bitmime)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-8BITMIME\r\n", 11);
+ }
- if (acl_smtp_etrn)
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-ETRN\r\n", 7);
- }
- if (acl_smtp_vrfy)
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-VRFY\r\n", 7);
- }
- if (acl_smtp_expn)
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-EXPN\r\n", 7);
- }
+ /* Advertise DSN support if configured to do so. */
+ if (verify_check_host(&dsn_advertise_hosts) != FAIL)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-DSN\r\n", 6);
+ fl.dsn_advertised = TRUE;
+ }
- /* Exim is quite happy with pipelining, so let the other end know that
- it is safe to use it, unless advertising is disabled. */
+ /* Advertise ETRN/VRFY/EXPN if there's are ACL checking whether a host is
+ permitted to issue them; a check is made when any host actually tries. */
- if (pipelining_enable &&
- verify_check_host(&pipelining_advertise_hosts) == OK)
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-PIPELINING\r\n", 13);
- sync_cmd_limit = NON_SYNC_CMD_PIPELINING;
- pipelining_advertised = TRUE;
- }
+ GET_OPTION("acl_smtp_etrn");
+ if (acl_smtp_etrn)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-ETRN\r\n", 7);
+ }
+ GET_OPTION("acl_smtp_vrfy");
+ if (acl_smtp_vrfy)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-VRFY\r\n", 7);
+ }
+ GET_OPTION("acl_smtp_expn");
+ if (acl_smtp_expn)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-EXPN\r\n", 7);
+ }
+ /* Exim is quite happy with pipelining, so let the other end know that
+ it is safe to use it, unless advertising is disabled. */
- /* If any server authentication mechanisms are configured, advertise
- them if the current host is in auth_advertise_hosts. The problem with
- advertising always is that some clients then require users to
- authenticate (and aren't configurable otherwise) even though it may not
- be necessary (e.g. if the host is in host_accept_relay).
+ if ( f.pipelining_enable
+ && verify_check_host(&pipelining_advertise_hosts) == OK)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-PIPELINING\r\n", 13);
+ sync_cmd_limit = NON_SYNC_CMD_PIPELINING;
+ f.smtp_in_pipelining_advertised = TRUE;
+
+#ifndef DISABLE_PIPE_CONNECT
+ if (fl.pipe_connect_acceptable)
+ {
+ f.smtp_in_early_pipe_advertised = TRUE;
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-" EARLY_PIPE_FEATURE_NAME "\r\n", EARLY_PIPE_FEATURE_LEN+3);
+ }
+#endif
+ }
- RFC 2222 states that SASL mechanism names contain only upper case
- letters, so output the names in upper case, though we actually recognize
- them in either case in the AUTH command. */
- if ( auths
+ /* If any server authentication mechanisms are configured, advertise
+ them if the current host is in auth_advertise_hosts. The problem with
+ advertising always is that some clients then require users to
+ authenticate (and aren't configurable otherwise) even though it may not
+ be necessary (e.g. if the host is in host_accept_relay).
+
+ RFC 2222 states that SASL mechanism names contain only upper case
+ letters, so output the names in upper case, though we actually recognize
+ them in either case in the AUTH command. */
+
+ if ( auths
#ifdef AUTH_TLS
- && !sender_host_authenticated
+ && !sender_host_authenticated
#endif
- && verify_check_host(&auth_advertise_hosts) == OK
- )
- {
- auth_instance *au;
- BOOL first = TRUE;
- for (au = auths; au; au = au->next)
+ && verify_check_host(&auth_advertise_hosts) == OK
+ )
{
- au->advertised = FALSE;
- if (au->server)
+ BOOL first = TRUE;
+ for (auth_instance * au = auths; au; au = au->next)
{
- DEBUG(D_auth+D_expand) debug_printf_indent(
- "Evaluating advertise_condition for %s athenticator\n",
- au->public_name);
- if ( !au->advertise_condition
- || expand_check_condition(au->advertise_condition, au->name,
- US"authenticator")
- )
+ au->advertised = FALSE;
+ if (au->server)
{
- int saveptr;
- if (first)
+ DEBUG(D_auth+D_expand) debug_printf_indent(
+ "Evaluating advertise_condition for %s %s athenticator\n",
+ au->name, au->public_name);
+ if ( !au->advertise_condition
+ || expand_check_condition(au->advertise_condition, au->name,
+ US"authenticator")
+ )
{
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-AUTH", 5);
- first = FALSE;
- auth_advertised = TRUE;
+ int saveptr;
+ if (first)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-AUTH", 5);
+ first = FALSE;
+ fl.auth_advertised = TRUE;
+ }
+ saveptr = gstring_length(g);
+ g = string_catn(g, US" ", 1);
+ g = string_cat(g, au->public_name);
+ while (++saveptr < g->ptr) g->s[saveptr] = toupper(g->s[saveptr]);
+ au->advertised = TRUE;
}
- saveptr = g->ptr;
- g = string_catn(g, US" ", 1);
- g = string_cat (g, au->public_name);
- while (++saveptr < g->ptr) g->s[saveptr] = toupper(g->s[saveptr]);
- au->advertised = TRUE;
}
}
- }
- if (!first) g = string_catn(g, US"\r\n", 2);
- }
+ if (!first) g = string_catn(g, US"\r\n", 2);
+ }
- /* RFC 3030 CHUNKING */
+ /* RFC 3030 CHUNKING */
- if (verify_check_host(&chunking_advertise_hosts) != FAIL)
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-CHUNKING\r\n", 11);
- chunking_offered = TRUE;
- chunking_state = CHUNKING_OFFERED;
- }
+ if (verify_check_host(&chunking_advertise_hosts) != FAIL)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-CHUNKING\r\n", 11);
+ f.chunking_offered = TRUE;
+ chunking_state = CHUNKING_OFFERED;
+ }
- /* Advertise TLS (Transport Level Security) aka SSL (Secure Socket Layer)
- if it has been included in the binary, and the host matches
- tls_advertise_hosts. We must *not* advertise if we are already in a
- secure connection. */
+ /* Advertise TLS (Transport Level Security) aka SSL (Secure Socket Layer)
+ if it has been included in the binary, and the host matches
+ tls_advertise_hosts. We must *not* advertise if we are already in a
+ secure connection. */
-#ifdef SUPPORT_TLS
- if (tls_in.active < 0 &&
- verify_check_host(&tls_advertise_hosts) != FAIL)
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-STARTTLS\r\n", 11);
- tls_advertised = TRUE;
- }
+#ifndef DISABLE_TLS
+ if (tls_in.active.sock < 0 &&
+ verify_check_host(&tls_advertise_hosts) != FAIL)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-STARTTLS\r\n", 11);
+ fl.tls_advertised = TRUE;
+ }
+#endif
+#ifdef EXPERIMENTAL_XCLIENT
+ if (proxy_session || verify_check_host(&hosts_xclient) != FAIL)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = xclient_smtp_advertise_str(g);
+ }
#endif
-
#ifndef DISABLE_PRDR
- /* Per Recipient Data Response, draft by Eric A. Hall extending RFC */
- if (prdr_enable)
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-PRDR\r\n", 7);
- }
+ /* Per Recipient Data Response, draft by Eric A. Hall extending RFC */
+ if (prdr_enable)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-PRDR\r\n", 7);
+ }
#endif
#ifdef SUPPORT_I18N
- if ( accept_8bitmime
- && verify_check_host(&smtputf8_advertise_hosts) != FAIL)
- {
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US"-SMTPUTF8\r\n", 11);
- smtputf8_advertised = TRUE;
- }
+ if ( accept_8bitmime
+ && verify_check_host(&smtputf8_advertise_hosts) != FAIL)
+ {
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US"-SMTPUTF8\r\n", 11);
+ fl.smtputf8_advertised = TRUE;
+ }
#endif
- /* Finish off the multiline reply with one that is always available. */
+ /* Finish off the multiline reply with one that is always available. */
- g = string_catn(g, smtp_code, 3);
- g = string_catn(g, US" HELP\r\n", 7);
- }
-
- /* Terminate the string (for debug), write it, and note that HELO/EHLO
- has been seen. */
+ g = string_catn(g, smtp_code, 3);
+ g = string_catn(g, US" HELP\r\n", 7);
+ }
-#ifdef SUPPORT_TLS
- if (tls_in.active >= 0) (void)tls_write(TRUE, g->s, g->ptr, FALSE); else
+ /* Terminate the string (for debug), write it, and note that HELO/EHLO
+ has been seen. */
+
+ {
+ uschar * ehlo_resp;
+ int len = len_string_from_gstring(g, &ehlo_resp);
+#ifndef DISABLE_TLS
+ if (tls_in.active.sock >= 0)
+ (void) tls_write(NULL, ehlo_resp, len,
+# ifndef DISABLE_PIPE_CONNECT
+ fl.pipe_connect_acceptable && pipeline_connect_sends());
+# else
+ FALSE);
+# endif
+ else
#endif
+ (void) fwrite(ehlo_resp, 1, len, smtp_out);
+
+ DEBUG(D_receive) for (const uschar * t, * s = ehlo_resp;
+ s && (t = Ustrchr(s, '\r'));
+ s = t + 2) /* \r\n */
+ debug_printf("%s %.*s\n",
+ s == g->s ? "SMTP>>" : " ",
+ (int)(t - s), s);
+ fl.helo_seen = TRUE;
+ }
+
+ /* Reset the protocol and the state, abandoning any previous message. */
+ received_protocol =
+ (sender_host_address ? protocols : protocols_local)
+ [ (fl.esmtp
+ ? pextend + (sender_host_authenticated ? pauthed : 0)
+ : pnormal)
+ + (tls_in.active.sock >= 0 ? pcrpted : 0)
+ ];
+ cancel_cutthrough_connection(TRUE, US"sent EHLO response");
+ reset_point = smtp_reset(reset_point);
+ toomany = FALSE;
+ break; /* HELO/EHLO */
+#ifdef EXPERIMENTAL_XCLIENT
+ case XCLIENT_CMD:
{
- int i = fwrite(g->s, 1, g->ptr, smtp_out); i = i; /* compiler quietening */
- }
- DEBUG(D_receive)
- {
- uschar *cr;
+ BOOL fatal = fl.helo_seen;
+ uschar * errmsg;
+ int resp;
+
+ HAD(SCH_XCLIENT);
+ smtp_mailcmd_count++;
- (void) string_from_gstring(g);
- while ((cr = Ustrchr(g->s, '\r')) != NULL) /* lose CRs */
- memmove(cr, cr + 1, (g->ptr--) - (cr - g->s));
- debug_printf("SMTP>> %s", g->s);
+ if ((errmsg = xclient_smtp_command(smtp_cmd_data, &resp, &fatal)))
+ if (fatal)
+ done = synprot_error(L_smtp_syntax_error, resp, NULL, errmsg);
+ else
+ {
+ smtp_printf("%d %s\r\n", SP_NO_MORE, resp, errmsg);
+ log_write(0, LOG_MAIN|LOG_REJECT, "rejected XCLIENT from %s: %s",
+ host_and_ident(FALSE), errmsg);
+ }
+ else
+ {
+ fl.helo_seen = FALSE; /* Require another EHLO */
+ smtp_code = string_sprintf("%d", resp);
+
+ /*XXX unclear in spec. if this needs to be an ESMTP banner,
+ nor whether we get the original client's HELO after (or a proxy fake).
+ We require that we do; the following HELO/EHLO handling will set
+ sender_helo_name as normal. */
+
+ smtp_printf("%s XCLIENT success\r\n", SP_NO_MORE, smtp_code);
+ }
+ break; /* XCLIENT */
}
- helo_seen = TRUE;
-
- /* Reset the protocol and the state, abandoning any previous message. */
- received_protocol =
- (sender_host_address ? protocols : protocols_local)
- [ (esmtp
- ? pextend + (sender_host_authenticated ? pauthed : 0)
- : pnormal)
- + (tls_in.active >= 0 ? pcrpted : 0)
- ];
- cancel_cutthrough_connection(TRUE, US"sent EHLO response");
- smtp_reset(reset_point);
- toomany = FALSE;
- break; /* HELO/EHLO */
+#endif
/* The MAIL command requires an address as an operand. All we do
it is the canonical extracted address which is all that is kept. */
case MAIL_CMD:
- HAD(SCH_MAIL);
- smtp_mailcmd_count++; /* Count for limit and ratelimit */
- was_rej_mail = TRUE; /* Reset if accepted */
- env_mail_type_t * mail_args; /* Sanity check & validate args */
-
- if (helo_required && !helo_seen)
- {
- smtp_printf("503 HELO or EHLO required\r\n", FALSE);
- log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL from %s: no "
- "HELO/EHLO given", host_and_ident(FALSE));
- break;
- }
-
- if (sender_address != NULL)
- {
- done = synprot_error(L_smtp_protocol_error, 503, NULL,
- US"sender already given");
- break;
- }
+ HAD(SCH_MAIL);
+ smtp_mailcmd_count++; /* Count for limit and ratelimit */
+ message_start();
+ was_rej_mail = TRUE; /* Reset if accepted */
+ env_mail_type_t * mail_args; /* Sanity check & validate args */
+
+ if (!fl.helo_seen)
+ if ( fl.helo_verify_required
+ || verify_check_host(&hosts_require_helo) == OK)
+ {
+ log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL from %s: no "
+ "HELO/EHLO given", host_and_ident(FALSE));
+ done = synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"HELO or EHLO required");
+ break;
+ }
+ else if (smtp_mailcmd_max < 0)
+ smtp_mailcmd_max = expand_mailmax(smtp_accept_max_per_connection);
- if (smtp_cmd_data[0] == 0)
- {
- done = synprot_error(L_smtp_protocol_error, 501, NULL,
- US"MAIL must have an address operand");
- break;
- }
+ if (sender_address)
+ {
+ done = synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"sender already given");
+ break;
+ }
- /* Check to see if the limit for messages per connection would be
- exceeded by accepting further messages. */
+ if (!*smtp_cmd_data)
+ {
+ done = synprot_error(L_smtp_protocol_error, 501, NULL,
+ US"MAIL must have an address operand");
+ break;
+ }
- if (smtp_accept_max_per_connection > 0 &&
- smtp_mailcmd_count > smtp_accept_max_per_connection)
- {
- smtp_printf("421 too many messages in this connection\r\n", FALSE);
- log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL command %s: too many "
- "messages in one connection", host_and_ident(TRUE));
- break;
- }
+ /* Check to see if the limit for messages per connection would be
+ exceeded by accepting further messages. */
- /* Reset for start of message - even if this is going to fail, we
- obviously need to throw away any previous data. */
+ if (smtp_mailcmd_max > 0 && smtp_mailcmd_count > smtp_mailcmd_max)
+ {
+ smtp_printf("421 too many messages in this connection\r\n", SP_NO_MORE);
+ log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL command %s: too many "
+ "messages in one connection", host_and_ident(TRUE));
+ break;
+ }
- cancel_cutthrough_connection(TRUE, US"MAIL received");
- smtp_reset(reset_point);
- toomany = FALSE;
- sender_data = recipient_data = NULL;
+ /* Reset for start of message - even if this is going to fail, we
+ obviously need to throw away any previous data. */
- /* Loop, checking for ESMTP additions to the MAIL FROM command. */
+ cancel_cutthrough_connection(TRUE, US"MAIL received");
+ reset_point = smtp_reset(reset_point);
+ toomany = FALSE;
+ sender_data = recipient_data = NULL;
- if (esmtp) for(;;)
- {
- uschar *name, *value, *end;
- unsigned long int size;
- BOOL arg_error = FALSE;
+ /* Loop, checking for ESMTP additions to the MAIL FROM command. */
- if (!extract_option(&name, &value)) break;
+ if (fl.esmtp) for(;;)
+ {
+ uschar *name, *value, *end;
+ unsigned long int size;
+ BOOL arg_error = FALSE;
- for (mail_args = env_mail_type_list;
- mail_args->value != ENV_MAIL_OPT_NULL;
- mail_args++
- )
- if (strcmpic(name, mail_args->name) == 0)
- break;
- if (mail_args->need_value && strcmpic(value, US"") == 0)
- break;
+ if (!extract_option(&name, &value)) break;
- switch(mail_args->value)
- {
- /* Handle SIZE= by reading the value. We don't do the check till later,
- in order to be able to log the sender address on failure. */
- case ENV_MAIL_OPT_SIZE:
- if (((size = Ustrtoul(value, &end, 10)), *end == 0))
- {
- if ((size == ULONG_MAX && errno == ERANGE) || size > INT_MAX)
- size = INT_MAX;
- message_size = (int)size;
- }
- else
- arg_error = TRUE;
- break;
+ for (mail_args = env_mail_type_list;
+ mail_args->value != ENV_MAIL_OPT_NULL;
+ mail_args++
+ )
+ if (strcmpic(name, mail_args->name) == 0)
+ break;
+ if (mail_args->need_value && strcmpic(value, US"") == 0)
+ break;
- /* If this session was initiated with EHLO and accept_8bitmime is set,
- Exim will have indicated that it supports the BODY=8BITMIME option. In
- fact, it does not support this according to the RFCs, in that it does not
- take any special action for forwarding messages containing 8-bit
- characters. That is why accept_8bitmime is not the default setting, but
- some sites want the action that is provided. We recognize both "8BITMIME"
- and "7BIT" as body types, but take no action. */
- case ENV_MAIL_OPT_BODY:
- if (accept_8bitmime) {
- if (strcmpic(value, US"8BITMIME") == 0)
- body_8bitmime = 8;
- else if (strcmpic(value, US"7BIT") == 0)
- body_8bitmime = 7;
- else
+ switch(mail_args->value)
+ {
+ /* Handle SIZE= by reading the value. We don't do the check till later,
+ in order to be able to log the sender address on failure. */
+ case ENV_MAIL_OPT_SIZE:
+ if (((size = Ustrtoul(value, &end, 10)), *end == 0))
{
- body_8bitmime = 0;
- done = synprot_error(L_smtp_syntax_error, 501, NULL,
- US"invalid data for BODY");
- goto COMMAND_LOOP;
- }
- DEBUG(D_receive) debug_printf("8BITMIME: %d\n", body_8bitmime);
+ if ((size == ULONG_MAX && errno == ERANGE) || size > INT_MAX)
+ size = INT_MAX;
+ message_size = (int)size;
+ }
+ else
+ arg_error = TRUE;
+ break;
+
+ /* If this session was initiated with EHLO and accept_8bitmime is set,
+ Exim will have indicated that it supports the BODY=8BITMIME option. In
+ fact, it does not support this according to the RFCs, in that it does not
+ take any special action for forwarding messages containing 8-bit
+ characters. That is why accept_8bitmime is not the default setting, but
+ some sites want the action that is provided. We recognize both "8BITMIME"
+ and "7BIT" as body types, but take no action. */
+ case ENV_MAIL_OPT_BODY:
+ if (accept_8bitmime) {
+ if (strcmpic(value, US"8BITMIME") == 0)
+ body_8bitmime = 8;
+ else if (strcmpic(value, US"7BIT") == 0)
+ body_8bitmime = 7;
+ else
+ {
+ body_8bitmime = 0;
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"invalid data for BODY");
+ goto COMMAND_LOOP;
+ }
+ DEBUG(D_receive) debug_printf("8BITMIME: %d\n", body_8bitmime);
+ break;
+ }
+ arg_error = TRUE;
break;
- }
- arg_error = TRUE;
- break;
- /* Handle the two DSN options, but only if configured to do so (which
- will have caused "DSN" to be given in the EHLO response). The code itself
- is included only if configured in at build time. */
+ /* Handle the two DSN options, but only if configured to do so (which
+ will have caused "DSN" to be given in the EHLO response). The code itself
+ is included only if configured in at build time. */
- case ENV_MAIL_OPT_RET:
- if (dsn_advertised)
- {
- /* Check if RET has already been set */
- if (dsn_ret > 0)
- {
- synprot_error(L_smtp_syntax_error, 501, NULL,
- US"RET can be specified once only");
- goto COMMAND_LOOP;
- }
- dsn_ret = strcmpic(value, US"HDRS") == 0
- ? dsn_ret_hdrs
- : strcmpic(value, US"FULL") == 0
- ? dsn_ret_full
- : 0;
- DEBUG(D_receive) debug_printf("DSN_RET: %d\n", dsn_ret);
- /* Check for invalid invalid value, and exit with error */
- if (dsn_ret == 0)
+ case ENV_MAIL_OPT_RET:
+ if (fl.dsn_advertised)
{
- synprot_error(L_smtp_syntax_error, 501, NULL,
- US"Value for RET is invalid");
- goto COMMAND_LOOP;
+ /* Check if RET has already been set */
+ if (dsn_ret > 0)
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"RET can be specified once only");
+ goto COMMAND_LOOP;
+ }
+ dsn_ret = strcmpic(value, US"HDRS") == 0
+ ? dsn_ret_hdrs
+ : strcmpic(value, US"FULL") == 0
+ ? dsn_ret_full
+ : 0;
+ DEBUG(D_receive) debug_printf("DSN_RET: %d\n", dsn_ret);
+ /* Check for invalid invalid value, and exit with error */
+ if (dsn_ret == 0)
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"Value for RET is invalid");
+ goto COMMAND_LOOP;
+ }
}
- }
- break;
- case ENV_MAIL_OPT_ENVID:
- if (dsn_advertised)
- {
- /* Check if the dsn envid has been already set */
- if (dsn_envid != NULL)
+ break;
+ case ENV_MAIL_OPT_ENVID:
+ if (fl.dsn_advertised)
{
- synprot_error(L_smtp_syntax_error, 501, NULL,
- US"ENVID can be specified once only");
- goto COMMAND_LOOP;
+ /* Check if the dsn envid has been already set */
+ if (dsn_envid)
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"ENVID can be specified once only");
+ goto COMMAND_LOOP;
+ }
+ dsn_envid = string_copy(value);
+ DEBUG(D_receive) debug_printf("DSN_ENVID: %s\n", dsn_envid);
}
- dsn_envid = string_copy(value);
- DEBUG(D_receive) debug_printf("DSN_ENVID: %s\n", dsn_envid);
- }
- break;
-
- /* Handle the AUTH extension. If the value given is not "<>" and either
- the ACL says "yes" or there is no ACL but the sending host is
- authenticated, we set it up as the authenticated sender. However, if the
- authenticator set a condition to be tested, we ignore AUTH on MAIL unless
- the condition is met. The value of AUTH is an xtext, which means that +,
- = and cntrl chars are coded in hex; however "<>" is unaffected by this
- coding. */
- case ENV_MAIL_OPT_AUTH:
- if (Ustrcmp(value, "<>") != 0)
- {
- int rc;
- uschar *ignore_msg;
-
- if (auth_xtextdecode(value, &authenticated_sender) < 0)
- {
- /* Put back terminator overrides for error message */
- value[-1] = '=';
- name[-1] = ' ';
- done = synprot_error(L_smtp_syntax_error, 501, NULL,
- US"invalid data for AUTH");
- goto COMMAND_LOOP;
- }
- if (!acl_smtp_mailauth)
- {
- ignore_msg = US"client not authenticated";
- rc = sender_host_authenticated ? OK : FAIL;
- }
- else
- {
- ignore_msg = US"rejected by ACL";
- rc = acl_check(ACL_WHERE_MAILAUTH, NULL, acl_smtp_mailauth,
- &user_msg, &log_msg);
- }
-
- switch (rc)
- {
- case OK:
- if (authenticated_by == NULL ||
- authenticated_by->mail_auth_condition == NULL ||
- expand_check_condition(authenticated_by->mail_auth_condition,
- authenticated_by->name, US"authenticator"))
- break; /* Accept the AUTH */
-
- ignore_msg = US"server_mail_auth_condition failed";
- if (authenticated_id != NULL)
- ignore_msg = string_sprintf("%s: authenticated ID=\"%s\"",
- ignore_msg, authenticated_id);
-
- /* Fall through */
-
- case FAIL:
- authenticated_sender = NULL;
- log_write(0, LOG_MAIN, "ignoring AUTH=%s from %s (%s)",
- value, host_and_ident(TRUE), ignore_msg);
- break;
+ break;
- /* Should only get DEFER or ERROR here. Put back terminator
- overrides for error message */
+ /* Handle the AUTH extension. If the value given is not "<>" and either
+ the ACL says "yes" or there is no ACL but the sending host is
+ authenticated, we set it up as the authenticated sender. However, if the
+ authenticator set a condition to be tested, we ignore AUTH on MAIL unless
+ the condition is met. The value of AUTH is an xtext, which means that +,
+ = and cntrl chars are coded in hex; however "<>" is unaffected by this
+ coding. */
+ case ENV_MAIL_OPT_AUTH:
+ if (Ustrcmp(value, "<>") != 0)
+ {
+ int rc;
+ uschar *ignore_msg;
- default:
+ if (auth_xtextdecode(value, &authenticated_sender) < 0)
+ {
+ /* Put back terminator overrides for error message */
value[-1] = '=';
name[-1] = ' ';
- (void)smtp_handle_acl_fail(ACL_WHERE_MAILAUTH, rc, user_msg,
- log_msg);
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"invalid data for AUTH");
goto COMMAND_LOOP;
- }
- }
- break;
+ }
+ GET_OPTION("acl_smtp_mailauth");
+ if (!acl_smtp_mailauth)
+ {
+ ignore_msg = US"client not authenticated";
+ rc = sender_host_authenticated ? OK : FAIL;
+ }
+ else
+ {
+ ignore_msg = US"rejected by ACL";
+ rc = acl_check(ACL_WHERE_MAILAUTH, NULL, acl_smtp_mailauth,
+ &user_msg, &log_msg);
+ }
+
+ switch (rc)
+ {
+ case OK:
+ if (authenticated_by == NULL ||
+ authenticated_by->mail_auth_condition == NULL ||
+ expand_check_condition(authenticated_by->mail_auth_condition,
+ authenticated_by->name, US"authenticator"))
+ break; /* Accept the AUTH */
+
+ ignore_msg = US"server_mail_auth_condition failed";
+ if (authenticated_id != NULL)
+ ignore_msg = string_sprintf("%s: authenticated ID=\"%s\"",
+ ignore_msg, authenticated_id);
+
+ /* Fall through */
+
+ case FAIL:
+ authenticated_sender = NULL;
+ log_write(0, LOG_MAIN, "ignoring AUTH=%s from %s (%s)",
+ value, host_and_ident(TRUE), ignore_msg);
+ break;
+
+ /* Should only get DEFER or ERROR here. Put back terminator
+ overrides for error message */
+
+ default:
+ value[-1] = '=';
+ name[-1] = ' ';
+ (void)smtp_handle_acl_fail(ACL_WHERE_MAILAUTH, rc, user_msg,
+ log_msg);
+ goto COMMAND_LOOP;
+ }
+ }
+ break;
#ifndef DISABLE_PRDR
- case ENV_MAIL_OPT_PRDR:
- if (prdr_enable)
- prdr_requested = TRUE;
- break;
+ case ENV_MAIL_OPT_PRDR:
+ if (prdr_enable)
+ prdr_requested = TRUE;
+ break;
#endif
#ifdef SUPPORT_I18N
- case ENV_MAIL_OPT_UTF8:
- if (smtputf8_advertised)
- {
- int old_pool = store_pool;
+ case ENV_MAIL_OPT_UTF8:
+ if (!fl.smtputf8_advertised)
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"SMTPUTF8 used when not advertised");
+ goto COMMAND_LOOP;
+ }
DEBUG(D_receive) debug_printf("smtputf8 requested\n");
message_smtputf8 = allow_utf8_domains = TRUE;
- store_pool = POOL_PERM;
- received_protocol = string_sprintf("utf8%s", received_protocol);
- store_pool = old_pool;
- }
- break;
+ if (Ustrncmp(received_protocol, US"utf8", 4) != 0)
+ {
+ int old_pool = store_pool;
+ store_pool = POOL_PERM;
+ received_protocol = string_sprintf("utf8%s", received_protocol);
+ store_pool = old_pool;
+ }
+ break;
#endif
- /* No valid option. Stick back the terminator characters and break
- the loop. Do the name-terminator second as extract_option sets
- value==name when it found no equal-sign.
- An error for a malformed address will occur. */
- case ENV_MAIL_OPT_NULL:
- value[-1] = '=';
- name[-1] = ' ';
- arg_error = TRUE;
- break;
- default: assert(0);
- }
- /* Break out of for loop if switch() had bad argument or
- when start of the email address is reached */
- if (arg_error) break;
- }
+ /* No valid option. Stick back the terminator characters and break
+ the loop. Do the name-terminator second as extract_option sets
+ value==name when it found no equal-sign.
+ An error for a malformed address will occur. */
+ case ENV_MAIL_OPT_NULL:
+ value[-1] = '=';
+ name[-1] = ' ';
+ arg_error = TRUE;
+ break;
- /* If we have passed the threshold for rate limiting, apply the current
- delay, and update it for next time, provided this is a limited host. */
+ default: assert(0);
+ }
+ /* Break out of for loop if switch() had bad argument or
+ when start of the email address is reached */
+ if (arg_error) break;
+ }
- if (smtp_mailcmd_count > smtp_rlm_threshold &&
- verify_check_host(&smtp_ratelimit_hosts) == OK)
- {
- DEBUG(D_receive) debug_printf("rate limit MAIL: delay %.3g sec\n",
- smtp_delay_mail/1000.0);
- millisleep((int)smtp_delay_mail);
- smtp_delay_mail *= smtp_rlm_factor;
- if (smtp_delay_mail > (double)smtp_rlm_limit)
- smtp_delay_mail = (double)smtp_rlm_limit;
- }
+ /* If we have passed the threshold for rate limiting, apply the current
+ delay, and update it for next time, provided this is a limited host. */
- /* Now extract the address, first applying any SMTP-time rewriting. The
- TRUE flag allows "<>" as a sender address. */
+ if (smtp_mailcmd_count > smtp_rlm_threshold &&
+ verify_check_host(&smtp_ratelimit_hosts) == OK)
+ {
+ DEBUG(D_receive) debug_printf("rate limit MAIL: delay %.3g sec\n",
+ smtp_delay_mail/1000.0);
+ millisleep((int)smtp_delay_mail);
+ smtp_delay_mail *= smtp_rlm_factor;
+ if (smtp_delay_mail > (double)smtp_rlm_limit)
+ smtp_delay_mail = (double)smtp_rlm_limit;
+ }
- raw_sender = rewrite_existflags & rewrite_smtp
- ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
- global_rewrite_rules)
- : smtp_cmd_data;
+ /* Now extract the address, first applying any SMTP-time rewriting. The
+ TRUE flag allows "<>" as a sender address. */
- raw_sender =
- parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain,
- TRUE);
+ raw_sender = rewrite_existflags & rewrite_smtp
+ /* deconst ok as smtp_cmd_data was not const */
+ ? US rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
+ global_rewrite_rules)
+ : smtp_cmd_data;
- if (!raw_sender)
- {
- done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess);
- break;
- }
+ raw_sender =
+ parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain,
+ TRUE);
- sender_address = raw_sender;
+ if (!raw_sender)
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess);
+ break;
+ }
- /* If there is a configured size limit for mail, check that this message
- doesn't exceed it. The check is postponed to this point so that the sender
- can be logged. */
+ sender_address = raw_sender;
- if (thismessage_size_limit > 0 && message_size > thismessage_size_limit)
- {
- smtp_printf("552 Message size exceeds maximum permitted\r\n", FALSE);
- log_write(L_size_reject,
- LOG_MAIN|LOG_REJECT, "rejected MAIL FROM:<%s> %s: "
- "message too big: size%s=%d max=%d",
- sender_address,
- host_and_ident(TRUE),
- (message_size == INT_MAX)? ">" : "",
- message_size,
- thismessage_size_limit);
- sender_address = NULL;
- break;
- }
+ /* If there is a configured size limit for mail, check that this message
+ doesn't exceed it. The check is postponed to this point so that the sender
+ can be logged. */
- /* Check there is enough space on the disk unless configured not to.
- When smtp_check_spool_space is set, the check is for thismessage_size_limit
- plus the current message - i.e. we accept the message only if it won't
- reduce the space below the threshold. Add 5000 to the size to allow for
- overheads such as the Received: line and storing of recipients, etc.
- By putting the check here, even when SIZE is not given, it allow VRFY
- and EXPN etc. to be used when space is short. */
-
- if (!receive_check_fs(
- (smtp_check_spool_space && message_size >= 0)?
- message_size + 5000 : 0))
- {
- smtp_printf("452 Space shortage, please try later\r\n", FALSE);
- sender_address = NULL;
- break;
- }
+ if (thismessage_size_limit > 0 && message_size > thismessage_size_limit)
+ {
+ smtp_printf("552 Message size exceeds maximum permitted\r\n", SP_NO_MORE);
+ log_write(L_size_reject,
+ LOG_MAIN|LOG_REJECT, "rejected MAIL FROM:<%s> %s: "
+ "message too big: size%s=%d max=%d",
+ sender_address,
+ host_and_ident(TRUE),
+ (message_size == INT_MAX)? ">" : "",
+ message_size,
+ thismessage_size_limit);
+ sender_address = NULL;
+ break;
+ }
- /* If sender_address is unqualified, reject it, unless this is a locally
- generated message, or the sending host or net is permitted to send
- unqualified addresses - typically local machines behaving as MUAs -
- in which case just qualify the address. The flag is set above at the start
- of the SMTP connection. */
+ /* Check there is enough space on the disk unless configured not to.
+ When smtp_check_spool_space is set, the check is for thismessage_size_limit
+ plus the current message - i.e. we accept the message only if it won't
+ reduce the space below the threshold. Add 5000 to the size to allow for
+ overheads such as the Received: line and storing of recipients, etc.
+ By putting the check here, even when SIZE is not given, it allow VRFY
+ and EXPN etc. to be used when space is short. */
+
+ if (!receive_check_fs(
+ smtp_check_spool_space && message_size >= 0
+ ? message_size + 5000 : 0))
+ {
+ smtp_printf("452 Space shortage, please try later\r\n", SP_NO_MORE);
+ sender_address = NULL;
+ break;
+ }
- if (sender_domain == 0 && sender_address[0] != 0)
- {
- if (allow_unqualified_sender)
- {
- sender_domain = Ustrlen(sender_address) + 1;
- sender_address = rewrite_address_qualify(sender_address, FALSE);
- DEBUG(D_receive) debug_printf("unqualified address %s accepted\n",
- raw_sender);
- }
- else
- {
- smtp_printf("501 %s: sender address must contain a domain\r\n", FALSE,
- smtp_cmd_data);
- log_write(L_smtp_syntax_error,
- LOG_MAIN|LOG_REJECT,
- "unqualified sender rejected: <%s> %s%s",
- raw_sender,
- host_and_ident(TRUE),
- host_lookup_msg);
- sender_address = NULL;
- break;
- }
- }
+ /* If sender_address is unqualified, reject it, unless this is a locally
+ generated message, or the sending host or net is permitted to send
+ unqualified addresses - typically local machines behaving as MUAs -
+ in which case just qualify the address. The flag is set above at the start
+ of the SMTP connection. */
- /* Apply an ACL check if one is defined, before responding. Afterwards,
- when pipelining is not advertised, do another sync check in case the ACL
- delayed and the client started sending in the meantime. */
+ if (!sender_domain && *sender_address)
+ if (f.allow_unqualified_sender)
+ {
+ sender_domain = Ustrlen(sender_address) + 1;
+ /* deconst ok as sender_address was not const */
+ sender_address = US rewrite_address_qualify(sender_address, FALSE);
+ DEBUG(D_receive) debug_printf("unqualified address %s accepted\n",
+ raw_sender);
+ }
+ else
+ {
+ smtp_printf("501 %s: sender address must contain a domain\r\n", SP_NO_MORE,
+ smtp_cmd_data);
+ log_write(L_smtp_syntax_error,
+ LOG_MAIN|LOG_REJECT,
+ "unqualified sender rejected: <%s> %s%s",
+ raw_sender,
+ host_and_ident(TRUE),
+ host_lookup_msg);
+ sender_address = NULL;
+ break;
+ }
- if (acl_smtp_mail)
- {
- rc = acl_check(ACL_WHERE_MAIL, NULL, acl_smtp_mail, &user_msg, &log_msg);
- if (rc == OK && !pipelining_advertised && !check_sync())
- goto SYNC_FAILURE;
- }
- else
- rc = OK;
+ /* Apply an ACL check if one is defined, before responding. Afterwards,
+ when pipelining is not advertised, do another sync check in case the ACL
+ delayed and the client started sending in the meantime. */
- if (rc == OK || rc == DISCARD)
- {
- BOOL more = pipeline_response();
+ GET_OPTION("acl_smtp_mail");
+ if (acl_smtp_mail)
+ {
+ rc = acl_check(ACL_WHERE_MAIL, NULL, acl_smtp_mail, &user_msg, &log_msg);
+ if (rc == OK && !f.smtp_in_pipelining_advertised && !check_sync())
+ goto SYNC_FAILURE;
+ }
+ else
+ rc = OK;
- if (!user_msg)
- smtp_printf("%s%s%s", more, US"250 OK",
- #ifndef DISABLE_PRDR
- prdr_requested ? US", PRDR Requested" : US"",
- #else
- US"",
- #endif
- US"\r\n");
+ if (rc == OK || rc == DISCARD)
+ {
+ BOOL more = pipeline_response();
+
+ if (!user_msg)
+ smtp_printf("%s%s%s", more, US"250 OK",
+ #ifndef DISABLE_PRDR
+ prdr_requested ? US", PRDR Requested" : US"",
+ #else
+ US"",
+ #endif
+ US"\r\n");
+ else
+ {
+ #ifndef DISABLE_PRDR
+ if (prdr_requested)
+ user_msg = string_sprintf("%s%s", user_msg, US", PRDR Requested");
+ #endif
+ smtp_user_msg(US"250", user_msg);
+ }
+ smtp_delay_rcpt = smtp_rlr_base;
+ f.recipients_discarded = (rc == DISCARD);
+ was_rej_mail = FALSE;
+ }
else
- {
- #ifndef DISABLE_PRDR
- if (prdr_requested)
- user_msg = string_sprintf("%s%s", user_msg, US", PRDR Requested");
- #endif
- smtp_user_msg(US"250", user_msg);
- }
- smtp_delay_rcpt = smtp_rlr_base;
- recipients_discarded = (rc == DISCARD);
- was_rej_mail = FALSE;
- }
- else
- {
- done = smtp_handle_acl_fail(ACL_WHERE_MAIL, rc, user_msg, log_msg);
- sender_address = NULL;
- }
- break;
+ {
+ done = smtp_handle_acl_fail(ACL_WHERE_MAIL, rc, user_msg, log_msg);
+ sender_address = NULL;
+ }
+ break;
/* The RCPT command requires an address as an operand. There may be any
are not used, as we keep only the extracted address. */
case RCPT_CMD:
- HAD(SCH_RCPT);
- rcpt_count++;
- was_rcpt = rcpt_in_progress = TRUE;
+ HAD(SCH_RCPT);
+ /* We got really to many recipients. A check against configured
+ limits is done later */
+ if (rcpt_count < 0 || rcpt_count >= INT_MAX/2)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Too many recipients: %d", rcpt_count);
+ rcpt_count++;
+ was_rcpt = fl.rcpt_in_progress = TRUE;
+
+ /* There must be a sender address; if the sender was rejected and
+ pipelining was advertised, we assume the client was pipelining, and do not
+ count this as a protocol error. Reset was_rej_mail so that further RCPTs
+ get the same treatment. */
- /* There must be a sender address; if the sender was rejected and
- pipelining was advertised, we assume the client was pipelining, and do not
- count this as a protocol error. Reset was_rej_mail so that further RCPTs
- get the same treatment. */
-
- if (sender_address == NULL)
- {
- if (pipelining_advertised && last_was_rej_mail)
- {
- smtp_printf("503 sender not yet given\r\n", FALSE);
- was_rej_mail = TRUE;
- }
- else
- {
- done = synprot_error(L_smtp_protocol_error, 503, NULL,
- US"sender not yet given");
- was_rcpt = FALSE; /* Not a valid RCPT */
- }
- rcpt_fail_count++;
- break;
- }
+ if (!sender_address)
+ {
+ if (f.smtp_in_pipelining_advertised && last_was_rej_mail)
+ {
+ smtp_printf("503 sender not yet given\r\n", SP_NO_MORE);
+ was_rej_mail = TRUE;
+ }
+ else
+ {
+ done = synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"sender not yet given");
+ was_rcpt = FALSE; /* Not a valid RCPT */
+ }
+ rcpt_fail_count++;
+ break;
+ }
- /* Check for an operand */
+ /* Check for an operand */
- if (smtp_cmd_data[0] == 0)
- {
- done = synprot_error(L_smtp_syntax_error, 501, NULL,
- US"RCPT must have an address operand");
- rcpt_fail_count++;
- break;
- }
+ if (!smtp_cmd_data[0])
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"RCPT must have an address operand");
+ rcpt_fail_count++;
+ break;
+ }
- /* Set the DSN flags orcpt and dsn_flags from the session*/
- orcpt = NULL;
- flags = 0;
+ /* Set the DSN flags orcpt and dsn_flags from the session*/
+ orcpt = NULL;
+ dsn_flags = 0;
- if (esmtp) for(;;)
- {
- uschar *name, *value;
+ if (fl.esmtp) for(;;)
+ {
+ uschar *name, *value;
- if (!extract_option(&name, &value))
- break;
+ if (!extract_option(&name, &value))
+ break;
- if (dsn_advertised && strcmpic(name, US"ORCPT") == 0)
- {
- /* Check whether orcpt has been already set */
- if (orcpt)
+ if (fl.dsn_advertised && strcmpic(name, US"ORCPT") == 0)
{
- synprot_error(L_smtp_syntax_error, 501, NULL,
- US"ORCPT can be specified once only");
- goto COMMAND_LOOP;
- }
- orcpt = string_copy(value);
- DEBUG(D_receive) debug_printf("DSN orcpt: %s\n", orcpt);
- }
+ /* Check whether orcpt has been already set */
+ if (orcpt)
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"ORCPT can be specified once only");
+ goto COMMAND_LOOP;
+ }
+ orcpt = string_copy(value);
+ DEBUG(D_receive) debug_printf("DSN orcpt: %s\n", orcpt);
+ }
- else if (dsn_advertised && strcmpic(name, US"NOTIFY") == 0)
- {
- /* Check if the notify flags have been already set */
- if (flags > 0)
+ else if (fl.dsn_advertised && strcmpic(name, US"NOTIFY") == 0)
{
- synprot_error(L_smtp_syntax_error, 501, NULL,
- US"NOTIFY can be specified once only");
- goto COMMAND_LOOP;
- }
- if (strcmpic(value, US"NEVER") == 0)
- flags |= rf_notify_never;
- else
- {
- uschar *p = value;
- while (*p != 0)
- {
- uschar *pp = p;
- while (*pp != 0 && *pp != ',') pp++;
- if (*pp == ',') *pp++ = 0;
- if (strcmpic(p, US"SUCCESS") == 0)
- {
- DEBUG(D_receive) debug_printf("DSN: Setting notify success\n");
- flags |= rf_notify_success;
- }
- else if (strcmpic(p, US"FAILURE") == 0)
- {
- DEBUG(D_receive) debug_printf("DSN: Setting notify failure\n");
- flags |= rf_notify_failure;
- }
- else if (strcmpic(p, US"DELAY") == 0)
- {
- DEBUG(D_receive) debug_printf("DSN: Setting notify delay\n");
- flags |= rf_notify_delay;
- }
- else
+ /* Check if the notify flags have been already set */
+ if (dsn_flags > 0)
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"NOTIFY can be specified once only");
+ goto COMMAND_LOOP;
+ }
+ if (strcmpic(value, US"NEVER") == 0)
+ dsn_flags |= rf_notify_never;
+ else
+ {
+ uschar *p = value;
+ while (*p != 0)
{
- /* Catch any strange values */
- synprot_error(L_smtp_syntax_error, 501, NULL,
- US"Invalid value for NOTIFY parameter");
- goto COMMAND_LOOP;
- }
- p = pp;
- }
- DEBUG(D_receive) debug_printf("DSN Flags: %x\n", flags);
- }
- }
+ uschar *pp = p;
+ while (*pp != 0 && *pp != ',') pp++;
+ if (*pp == ',') *pp++ = 0;
+ if (strcmpic(p, US"SUCCESS") == 0)
+ {
+ DEBUG(D_receive) debug_printf("DSN: Setting notify success\n");
+ dsn_flags |= rf_notify_success;
+ }
+ else if (strcmpic(p, US"FAILURE") == 0)
+ {
+ DEBUG(D_receive) debug_printf("DSN: Setting notify failure\n");
+ dsn_flags |= rf_notify_failure;
+ }
+ else if (strcmpic(p, US"DELAY") == 0)
+ {
+ DEBUG(D_receive) debug_printf("DSN: Setting notify delay\n");
+ dsn_flags |= rf_notify_delay;
+ }
+ else
+ {
+ /* Catch any strange values */
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"Invalid value for NOTIFY parameter");
+ goto COMMAND_LOOP;
+ }
+ p = pp;
+ }
+ DEBUG(D_receive) debug_printf("DSN Flags: %x\n", dsn_flags);
+ }
+ }
- /* Unknown option. Stick back the terminator characters and break
- the loop. An error for a malformed address will occur. */
+ /* Unknown option. Stick back the terminator characters and break
+ the loop. An error for a malformed address will occur. */
- else
- {
- DEBUG(D_receive) debug_printf("Invalid RCPT option: %s : %s\n", name, value);
- name[-1] = ' ';
- value[-1] = '=';
- break;
- }
- }
+ else
+ {
+ DEBUG(D_receive) debug_printf("Invalid RCPT option: %s : %s\n", name, value);
+ name[-1] = ' ';
+ value[-1] = '=';
+ break;
+ }
+ }
- /* Apply SMTP rewriting then extract the working address. Don't allow "<>"
- as a recipient address */
+ /* Apply SMTP rewriting then extract the working address. Don't allow "<>"
+ as a recipient address */
- recipient = rewrite_existflags & rewrite_smtp
- ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
- global_rewrite_rules)
- : smtp_cmd_data;
+ recipient = rewrite_existflags & rewrite_smtp
+ /* deconst ok as smtp_cmd_data was not const */
+ ? US rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"",
+ global_rewrite_rules)
+ : smtp_cmd_data;
- if (!(recipient = parse_extract_address(recipient, &errmess, &start, &end,
- &recipient_domain, FALSE)))
- {
- done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess);
- rcpt_fail_count++;
- break;
- }
+ if (!(recipient = parse_extract_address(recipient, &errmess, &start, &end,
+ &recipient_domain, FALSE)))
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess);
+ rcpt_fail_count++;
+ break;
+ }
- /* If the recipient address is unqualified, reject it, unless this is a
- locally generated message. However, unqualified addresses are permitted
- from a configured list of hosts and nets - typically when behaving as
- MUAs rather than MTAs. Sad that SMTP is used for both types of traffic,
- really. The flag is set at the start of the SMTP connection.
+ /* If the recipient address is unqualified, reject it, unless this is a
+ locally generated message. However, unqualified addresses are permitted
+ from a configured list of hosts and nets - typically when behaving as
+ MUAs rather than MTAs. Sad that SMTP is used for both types of traffic,
+ really. The flag is set at the start of the SMTP connection.
- RFC 1123 talks about supporting "the reserved mailbox postmaster"; I always
- assumed this meant "reserved local part", but the revision of RFC 821 and
- friends now makes it absolutely clear that it means *mailbox*. Consequently
- we must always qualify this address, regardless. */
+ RFC 1123 talks about supporting "the reserved mailbox postmaster"; I always
+ assumed this meant "reserved local part", but the revision of RFC 821 and
+ friends now makes it absolutely clear that it means *mailbox*. Consequently
+ we must always qualify this address, regardless. */
- if (!recipient_domain)
- if (!(recipient_domain = qualify_recipient(&recipient, smtp_cmd_data,
- US"recipient")))
- {
- rcpt_fail_count++;
- break;
- }
+ if (!recipient_domain)
+ if (!(recipient_domain = qualify_recipient(&recipient, smtp_cmd_data,
+ US"recipient")))
+ {
+ rcpt_fail_count++;
+ break;
+ }
- /* Check maximum allowed */
+ /* Check maximum allowed */
- if (rcpt_count > recipients_max && recipients_max > 0)
- {
- if (recipients_max_reject)
- {
- rcpt_fail_count++;
- smtp_printf("552 too many recipients\r\n", FALSE);
- if (!toomany)
- log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: message "
- "rejected: sender=<%s> %s", sender_address, host_and_ident(TRUE));
- }
- else
- {
- rcpt_defer_count++;
- smtp_printf("452 too many recipients\r\n", FALSE);
- if (!toomany)
- log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: excess "
- "temporarily rejected: sender=<%s> %s", sender_address,
- host_and_ident(TRUE));
- }
+ if ( rcpt_count+1 < 0
+ || rcpt_count > recipients_max_expanded && recipients_max_expanded > 0)
+ {
+ if (recipients_max_reject)
+ {
+ rcpt_fail_count++;
+ smtp_printf("552 too many recipients\r\n", SP_NO_MORE);
+ if (!toomany)
+ log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: message "
+ "rejected: sender=<%s> %s", sender_address, host_and_ident(TRUE));
+ }
+ else
+ {
+ rcpt_defer_count++;
+ smtp_printf("452 too many recipients\r\n", SP_NO_MORE);
+ if (!toomany)
+ log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: excess "
+ "temporarily rejected: sender=<%s> %s", sender_address,
+ host_and_ident(TRUE));
+ }
- toomany = TRUE;
- break;
- }
+ toomany = TRUE;
+ break;
+ }
- /* If we have passed the threshold for rate limiting, apply the current
- delay, and update it for next time, provided this is a limited host. */
+ /* If we have passed the threshold for rate limiting, apply the current
+ delay, and update it for next time, provided this is a limited host. */
- if (rcpt_count > smtp_rlr_threshold &&
- verify_check_host(&smtp_ratelimit_hosts) == OK)
- {
- DEBUG(D_receive) debug_printf("rate limit RCPT: delay %.3g sec\n",
- smtp_delay_rcpt/1000.0);
- millisleep((int)smtp_delay_rcpt);
- smtp_delay_rcpt *= smtp_rlr_factor;
- if (smtp_delay_rcpt > (double)smtp_rlr_limit)
- smtp_delay_rcpt = (double)smtp_rlr_limit;
- }
+ if (rcpt_count > smtp_rlr_threshold &&
+ verify_check_host(&smtp_ratelimit_hosts) == OK)
+ {
+ DEBUG(D_receive) debug_printf("rate limit RCPT: delay %.3g sec\n",
+ smtp_delay_rcpt/1000.0);
+ millisleep((int)smtp_delay_rcpt);
+ smtp_delay_rcpt *= smtp_rlr_factor;
+ if (smtp_delay_rcpt > (double)smtp_rlr_limit)
+ smtp_delay_rcpt = (double)smtp_rlr_limit;
+ }
- /* If the MAIL ACL discarded all the recipients, we bypass ACL checking
- for them. Otherwise, check the access control list for this recipient. As
- there may be a delay in this, re-check for a synchronization error
- afterwards, unless pipelining was advertised. */
+ /* If the MAIL ACL discarded all the recipients, we bypass ACL checking
+ for them. Otherwise, check the access control list for this recipient. As
+ there may be a delay in this, re-check for a synchronization error
+ afterwards, unless pipelining was advertised. */
- if (recipients_discarded)
- rc = DISCARD;
- else
- if ( (rc = acl_check(ACL_WHERE_RCPT, recipient, acl_smtp_rcpt, &user_msg,
- &log_msg)) == OK
- && !pipelining_advertised && !check_sync())
- goto SYNC_FAILURE;
+ if (f.recipients_discarded)
+ rc = DISCARD;
+ else
+ {
+ GET_OPTION("acl_smtp_rcpt");
+ if ( (rc = acl_check(ACL_WHERE_RCPT, recipient, acl_smtp_rcpt, &user_msg,
+ &log_msg)) == OK
+ && !f.smtp_in_pipelining_advertised && !check_sync())
+ goto SYNC_FAILURE;
+ }
- /* The ACL was happy */
+ /* The ACL was happy */
- if (rc == OK)
- {
- BOOL more = pipeline_response();
+ if (rc == OK)
+ {
+ BOOL more = pipeline_response();
- if (user_msg)
- smtp_user_msg(US"250", user_msg);
- else
- smtp_printf("250 Accepted\r\n", more);
- receive_add_recipient(recipient, -1);
+ if (user_msg)
+ smtp_user_msg(US"250", user_msg);
+ else
+ smtp_printf("250 Accepted\r\n", more);
+ receive_add_recipient(recipient, -1);
- /* Set the dsn flags in the recipients_list */
- recipients_list[recipients_count-1].orcpt = orcpt;
- recipients_list[recipients_count-1].dsn_flags = flags;
+ /* Set the dsn flags in the recipients_list */
+ recipients_list[recipients_count-1].orcpt = orcpt;
+ recipients_list[recipients_count-1].dsn_flags = dsn_flags;
- DEBUG(D_receive) debug_printf("DSN: orcpt: %s flags: %d\n",
- recipients_list[recipients_count-1].orcpt,
- recipients_list[recipients_count-1].dsn_flags);
- }
+ /* DEBUG(D_receive) debug_printf("DSN: orcpt: %s flags: %d\n",
+ recipients_list[recipients_count-1].orcpt,
+ recipients_list[recipients_count-1].dsn_flags); */
+ }
- /* The recipient was discarded */
+ /* The recipient was discarded */
- else if (rc == DISCARD)
- {
- if (user_msg)
- smtp_user_msg(US"250", user_msg);
- else
- smtp_printf("250 Accepted\r\n", FALSE);
- rcpt_fail_count++;
- discarded = TRUE;
- log_write(0, LOG_MAIN|LOG_REJECT, "%s F=<%s> RCPT %s: "
- "discarded by %s ACL%s%s", host_and_ident(TRUE),
- sender_address_unrewritten? sender_address_unrewritten : sender_address,
- smtp_cmd_argument, recipients_discarded? "MAIL" : "RCPT",
- log_msg ? US": " : US"", log_msg ? log_msg : US"");
- }
+ else if (rc == DISCARD)
+ {
+ if (user_msg)
+ smtp_user_msg(US"250", user_msg);
+ else
+ smtp_printf("250 Accepted\r\n", SP_NO_MORE);
+ rcpt_fail_count++;
+ discarded = TRUE;
+ log_write(0, LOG_MAIN|LOG_REJECT, "%s F=<%s> RCPT %s: "
+ "discarded by %s ACL%s%s", host_and_ident(TRUE),
+ sender_address_unrewritten ? sender_address_unrewritten : sender_address,
+ smtp_cmd_argument, f.recipients_discarded ? "MAIL" : "RCPT",
+ log_msg ? US": " : US"", log_msg ? log_msg : US"");
+ }
- /* Either the ACL failed the address, or it was deferred. */
+ /* Either the ACL failed the address, or it was deferred. */
- else
- {
- if (rc == FAIL) rcpt_fail_count++; else rcpt_defer_count++;
- done = smtp_handle_acl_fail(ACL_WHERE_RCPT, rc, user_msg, log_msg);
- }
- break;
+ else
+ {
+ if (rc == FAIL) rcpt_fail_count++; else rcpt_defer_count++;
+ done = smtp_handle_acl_fail(ACL_WHERE_RCPT, rc, user_msg, log_msg);
+ }
+ break;
/* The DATA command is legal only if it follows successful MAIL FROM
with the DATA rejection (an idea suggested by Tony Finch). */
case BDAT_CMD:
- HAD(SCH_BDAT);
{
int n;
+ HAD(SCH_BDAT);
if (chunking_state != CHUNKING_OFFERED)
{
done = synprot_error(L_smtp_protocol_error, 503, NULL,
DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n",
(int)chunking_state, chunking_data_left);
- /* push the current receive_* function on the "stack", and
- replace them by bdat_getc(), which in turn will use the lwr_receive_*
- functions to do the dirty work. */
- lwr_receive_getc = receive_getc;
- lwr_receive_getbuf = receive_getbuf;
- lwr_receive_ungetc = receive_ungetc;
-
- receive_getc = bdat_getc;
- receive_ungetc = bdat_ungetc;
-
- dot_ends = FALSE;
+ f.bdat_readers_wanted = TRUE; /* FIXME: redundant vs chunking_state? */
+ f.dot_ends = FALSE;
goto DATA_BDAT;
}
case DATA_CMD:
- HAD(SCH_DATA);
- dot_ends = TRUE;
+ HAD(SCH_DATA);
+ f.dot_ends = TRUE;
+ f.bdat_readers_wanted = FALSE;
DATA_BDAT: /* Common code for DATA and BDAT */
- if (!discarded && recipients_count <= 0)
- {
- if (rcpt_smtp_response_same && rcpt_smtp_response != NULL)
- {
- uschar *code = US"503";
- int len = Ustrlen(rcpt_smtp_response);
- smtp_respond(code, 3, FALSE, US"All RCPT commands were rejected with "
- "this error:");
- /* Responses from smtp_printf() will have \r\n on the end */
- if (len > 2 && rcpt_smtp_response[len-2] == '\r')
- rcpt_smtp_response[len-2] = 0;
- smtp_respond(code, 3, FALSE, rcpt_smtp_response);
- }
- if (pipelining_advertised && last_was_rcpt)
- smtp_printf("503 Valid RCPT command must precede %s\r\n", FALSE,
- smtp_names[smtp_connection_had[smtp_ch_index-1]]);
- else
- done = synprot_error(L_smtp_protocol_error, 503, NULL,
- smtp_connection_had[smtp_ch_index-1] == SCH_DATA
- ? US"valid RCPT command must precede DATA"
- : US"valid RCPT command must precede BDAT");
+#ifndef DISABLE_PIPE_CONNECT
+ fl.pipe_connect_acceptable = FALSE;
+#endif
+ if (!discarded && recipients_count <= 0)
+ {
+ if (fl.rcpt_smtp_response_same && rcpt_smtp_response)
+ {
+ uschar *code = US"503";
+ int len = Ustrlen(rcpt_smtp_response);
+ smtp_respond(code, 3, SR_NOT_FINAL, US"All RCPT commands were rejected with "
+ "this error:");
+ /* Responses from smtp_printf() will have \r\n on the end */
+ if (len > 2 && rcpt_smtp_response[len-2] == '\r')
+ rcpt_smtp_response[len-2] = 0;
+ smtp_respond(code, 3, SR_NOT_FINAL, rcpt_smtp_response);
+ }
+ if (f.smtp_in_pipelining_advertised && last_was_rcpt)
+ smtp_printf("503 Valid RCPT command must precede %s\r\n", SP_NO_MORE,
+ smtp_names[smtp_connection_had[SMTP_HBUFF_PREV(smtp_ch_index)]]);
+ else
+ done = synprot_error(L_smtp_protocol_error, 503, NULL,
+ smtp_connection_had[SMTP_HBUFF_PREV(smtp_ch_index)] == SCH_DATA
+ ? US"valid RCPT command must precede DATA"
+ : US"valid RCPT command must precede BDAT");
- if (chunking_state > CHUNKING_OFFERED)
- bdat_flush_data();
- break;
- }
+ if (chunking_state > CHUNKING_OFFERED)
+ {
+ bdat_push_receive_functions();
+ bdat_flush_data();
+ }
+ break;
+ }
- if (toomany && recipients_max_reject)
- {
- sender_address = NULL; /* This will allow a new MAIL without RSET */
- sender_address_unrewritten = NULL;
- smtp_printf("554 Too many recipients\r\n", FALSE);
- break;
- }
+ if (toomany && recipients_max_reject)
+ {
+ sender_address = NULL; /* This will allow a new MAIL without RSET */
+ sender_address_unrewritten = NULL;
+ smtp_printf("554 Too many recipients\r\n", SP_NO_MORE);
- if (chunking_state > CHUNKING_OFFERED)
- rc = OK; /* No predata ACL or go-ahead output for BDAT */
- else
- {
- /* If there is an ACL, re-check the synchronization afterwards, since the
- ACL may have delayed. To handle cutthrough delivery enforce a dummy call
- to get the DATA command sent. */
+ if (chunking_state > CHUNKING_OFFERED)
+ {
+ bdat_push_receive_functions();
+ bdat_flush_data();
+ }
+ break;
+ }
- if (acl_smtp_predata == NULL && cutthrough.fd < 0)
- rc = OK;
+ if (chunking_state > CHUNKING_OFFERED)
+ rc = OK; /* There is no predata ACL or go-ahead output for BDAT */
else
{
- uschar * acl = acl_smtp_predata ? acl_smtp_predata : US"accept";
- enable_dollar_recipients = TRUE;
- rc = acl_check(ACL_WHERE_PREDATA, NULL, acl, &user_msg,
- &log_msg);
- enable_dollar_recipients = FALSE;
- if (rc == OK && !check_sync())
- goto SYNC_FAILURE;
+ /* If there is a predata-ACL, re-check the synchronization afterwards,
+ since the ACL may have delayed. To handle cutthrough delivery enforce a
+ dummy call to get the DATA command sent. */
- if (rc != OK)
- { /* Either the ACL failed the address, or it was deferred. */
- done = smtp_handle_acl_fail(ACL_WHERE_PREDATA, rc, user_msg, log_msg);
- break;
+ GET_OPTION("acl_smtp_predata");
+ if (!acl_smtp_predata && cutthrough.cctx.sock < 0)
+ rc = OK;
+ else
+ {
+ uschar * acl = acl_smtp_predata ? acl_smtp_predata : US"accept";
+ f.enable_dollar_recipients = TRUE;
+ rc = acl_check(ACL_WHERE_PREDATA, NULL, acl, &user_msg,
+ &log_msg);
+ f.enable_dollar_recipients = FALSE;
+ if (rc == OK && !check_sync())
+ goto SYNC_FAILURE;
+
+ if (rc != OK)
+ { /* Either the ACL failed the address, or it was deferred. */
+ done = smtp_handle_acl_fail(ACL_WHERE_PREDATA, rc, user_msg, log_msg);
+ break;
+ }
}
+
+ if (user_msg)
+ smtp_user_msg(US"354", user_msg);
+ else
+ smtp_printf(
+ "354 Enter message, ending with \".\" on a line by itself\r\n", SP_NO_MORE);
}
- if (user_msg)
- smtp_user_msg(US"354", user_msg);
- else
- smtp_printf(
- "354 Enter message, ending with \".\" on a line by itself\r\n", FALSE);
- }
+ if (f.bdat_readers_wanted)
+ bdat_push_receive_functions();
#ifdef TCP_QUICKACK
- if (smtp_in) /* all ACKs needed to ramp window up for bulk data */
- (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK,
- US &on, sizeof(on));
+ if (smtp_in) /* all ACKs needed to ramp window up for bulk data */
+ (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK,
+ US &on, sizeof(on));
#endif
- done = 3;
- message_ended = END_NOTENDED; /* Indicate in middle of data */
+ done = 3;
+ message_ended = END_NOTENDED; /* Indicate in middle of data */
- break;
+ break;
case VRFY_CMD:
if (!(address = parse_extract_address(smtp_cmd_data, &errmess,
&start, &end, &recipient_domain, FALSE)))
{
- smtp_printf("501 %s\r\n", FALSE, errmess);
+ smtp_printf("501 %s\r\n", SP_NO_MORE, errmess);
break;
}
US"verify")))
break;
+ GET_OPTION("acl_smtp_vrfy");
if ((rc = acl_check(ACL_WHERE_VRFY, address, acl_smtp_vrfy,
&user_msg, &log_msg)) != OK)
done = smtp_handle_acl_fail(ACL_WHERE_VRFY, rc, user_msg, log_msg);
break;
}
- smtp_printf("%s\r\n", FALSE, s);
+ smtp_printf("%s\r\n", SP_NO_MORE, s);
}
break;
}
case EXPN_CMD:
- HAD(SCH_EXPN);
- rc = acl_check(ACL_WHERE_EXPN, NULL, acl_smtp_expn, &user_msg, &log_msg);
- if (rc != OK)
- done = smtp_handle_acl_fail(ACL_WHERE_EXPN, rc, user_msg, log_msg);
- else
- {
- BOOL save_log_testing_mode = log_testing_mode;
- address_test_mode = log_testing_mode = TRUE;
- (void) verify_address(deliver_make_addr(smtp_cmd_data, FALSE),
- smtp_out, vopt_is_recipient | vopt_qualify | vopt_expn, -1, -1, -1,
- NULL, NULL, NULL);
- address_test_mode = FALSE;
- log_testing_mode = save_log_testing_mode; /* true for -bh */
- }
- break;
+ HAD(SCH_EXPN);
+ GET_OPTION("acl_smtp_expn");
+ rc = acl_check(ACL_WHERE_EXPN, NULL, acl_smtp_expn, &user_msg, &log_msg);
+ if (rc != OK)
+ done = smtp_handle_acl_fail(ACL_WHERE_EXPN, rc, user_msg, log_msg);
+ else
+ {
+ BOOL save_log_testing_mode = f.log_testing_mode;
+ f.address_test_mode = f.log_testing_mode = TRUE;
+ (void) verify_address(deliver_make_addr(smtp_cmd_data, FALSE),
+ smtp_out, vopt_is_recipient | vopt_qualify | vopt_expn, -1, -1, -1,
+ NULL, NULL, NULL);
+ f.address_test_mode = FALSE;
+ f.log_testing_mode = save_log_testing_mode; /* true for -bh */
+ }
+ break;
- #ifdef SUPPORT_TLS
+ #ifndef DISABLE_TLS
case STARTTLS_CMD:
- HAD(SCH_STARTTLS);
- if (!tls_advertised)
- {
- done = synprot_error(L_smtp_protocol_error, 503, NULL,
- US"STARTTLS command used when not advertised");
- break;
- }
-
- /* Apply an ACL check if one is defined */
+ HAD(SCH_STARTTLS);
+ if (!fl.tls_advertised)
+ {
+ done = synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"STARTTLS command used when not advertised");
+ break;
+ }
- if ( acl_smtp_starttls
- && (rc = acl_check(ACL_WHERE_STARTTLS, NULL, acl_smtp_starttls,
- &user_msg, &log_msg)) != OK
- )
- {
- done = smtp_handle_acl_fail(ACL_WHERE_STARTTLS, rc, user_msg, log_msg);
- break;
- }
+ /* Apply an ACL check if one is defined */
- /* RFC 2487 is not clear on when this command may be sent, though it
- does state that all information previously obtained from the client
- must be discarded if a TLS session is started. It seems reasonable to
- do an implied RSET when STARTTLS is received. */
-
- incomplete_transaction_log(US"STARTTLS");
- cancel_cutthrough_connection(TRUE, US"STARTTLS received");
- smtp_reset(reset_point);
- toomany = FALSE;
- cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = FALSE;
-
- /* There's an attack where more data is read in past the STARTTLS command
- before TLS is negotiated, then assumed to be part of the secure session
- when used afterwards; we use segregated input buffers, so are not
- vulnerable, but we want to note when it happens and, for sheer paranoia,
- ensure that the buffer is "wiped".
- Pipelining sync checks will normally have protected us too, unless disabled
- by configuration. */
-
- if (receive_smtp_buffered())
- {
- DEBUG(D_any)
- debug_printf("Non-empty input buffer after STARTTLS; naive attack?\n");
- if (tls_in.active < 0)
- smtp_inend = smtp_inptr = smtp_inbuffer;
- /* and if TLS is already active, tls_server_start() should fail */
- }
+ GET_OPTION("acl_smtp_starttls");
+ if ( acl_smtp_starttls
+ && (rc = acl_check(ACL_WHERE_STARTTLS, NULL, acl_smtp_starttls,
+ &user_msg, &log_msg)) != OK
+ )
+ {
+ done = smtp_handle_acl_fail(ACL_WHERE_STARTTLS, rc, user_msg, log_msg);
+ break;
+ }
- /* There is nothing we value in the input buffer and if TLS is successfully
- negotiated, we won't use this buffer again; if TLS fails, we'll just read
- fresh content into it. The buffer contains arbitrary content from an
- untrusted remote source; eg: NOOP <shellcode>\r\nSTARTTLS\r\n
- It seems safest to just wipe away the content rather than leave it as a
- target to jump to. */
+ /* RFC 2487 is not clear on when this command may be sent, though it
+ does state that all information previously obtained from the client
+ must be discarded if a TLS session is started. It seems reasonable to
+ do an implied RSET when STARTTLS is received. */
+
+ incomplete_transaction_log(US"STARTTLS");
+ cancel_cutthrough_connection(TRUE, US"STARTTLS received");
+ reset_point = smtp_reset(reset_point);
+ toomany = FALSE;
+ cmd_list[CL_STLS].is_mail_cmd = FALSE;
+
+ /* There's an attack where more data is read in past the STARTTLS command
+ before TLS is negotiated, then assumed to be part of the secure session
+ when used afterwards; we use segregated input buffers, so are not
+ vulnerable, but we want to note when it happens and, for sheer paranoia,
+ ensure that the buffer is "wiped".
+ Pipelining sync checks will normally have protected us too, unless disabled
+ by configuration. */
+
+ if (receive_hasc())
+ {
+ DEBUG(D_any)
+ debug_printf("Non-empty input buffer after STARTTLS; naive attack?\n");
+ if (tls_in.active.sock < 0)
+ smtp_inend = smtp_inptr = smtp_inbuffer;
+ /* and if TLS is already active, tls_server_start() should fail */
+ }
- memset(smtp_inbuffer, 0, IN_BUFFER_SIZE);
+ /* There is nothing we value in the input buffer and if TLS is successfully
+ negotiated, we won't use this buffer again; if TLS fails, we'll just read
+ fresh content into it. The buffer contains arbitrary content from an
+ untrusted remote source; eg: NOOP <shellcode>\r\nSTARTTLS\r\n
+ It seems safest to just wipe away the content rather than leave it as a
+ target to jump to. */
- /* Attempt to start up a TLS session, and if successful, discard all
- knowledge that was obtained previously. At least, that's what the RFC says,
- and that's what happens by default. However, in order to work round YAEB,
- there is an option to remember the esmtp state. Sigh.
+ memset(smtp_inbuffer, 0, IN_BUFFER_SIZE);
- We must allow for an extra EHLO command and an extra AUTH command after
- STARTTLS that don't add to the nonmail command count. */
+ /* Attempt to start up a TLS session, and if successful, discard all
+ knowledge that was obtained previously. At least, that's what the RFC says,
+ and that's what happens by default. However, in order to work round YAEB,
+ there is an option to remember the esmtp state. Sigh.
- s = NULL;
- if ((rc = tls_server_start(tls_require_ciphers, &s)) == OK)
- {
- if (!tls_remember_esmtp)
- helo_seen = esmtp = auth_advertised = pipelining_advertised = FALSE;
- cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE;
- cmd_list[CMD_LIST_AUTH].is_mail_cmd = TRUE;
- cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE;
- if (sender_helo_name)
- {
- store_free(sender_helo_name);
- sender_helo_name = NULL;
- host_build_sender_fullhost(); /* Rebuild */
- set_process_info("handling incoming TLS connection from %s",
- host_and_ident(FALSE));
- }
- received_protocol =
- (sender_host_address ? protocols : protocols_local)
- [ (esmtp
- ? pextend + (sender_host_authenticated ? pauthed : 0)
- : pnormal)
- + (tls_in.active >= 0 ? pcrpted : 0)
- ];
+ We must allow for an extra EHLO command and an extra AUTH command after
+ STARTTLS that don't add to the nonmail command count. */
- sender_host_auth_pubname = sender_host_authenticated = NULL;
- authenticated_id = NULL;
- sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING;
- DEBUG(D_tls) debug_printf("TLS active\n");
- break; /* Successful STARTTLS */
- }
- else
- (void) smtp_log_tls_fail(s);
+ s = NULL;
+ if ((rc = tls_server_start(&s)) == OK)
+ {
+ if (!tls_remember_esmtp)
+ fl.helo_seen = fl.esmtp = fl.auth_advertised = f.smtp_in_pipelining_advertised = FALSE;
+ cmd_list[CL_EHLO].is_mail_cmd = TRUE;
+ cmd_list[CL_AUTH].is_mail_cmd = TRUE;
+ cmd_list[CL_TLAU].is_mail_cmd = TRUE;
+ if (sender_helo_name)
+ {
+ sender_helo_name = NULL;
+ host_build_sender_fullhost(); /* Rebuild */
+ set_process_info("handling incoming TLS connection from %s",
+ host_and_ident(FALSE));
+ }
+ received_protocol =
+ (sender_host_address ? protocols : protocols_local)
+ [ (fl.esmtp
+ ? pextend + (sender_host_authenticated ? pauthed : 0)
+ : pnormal)
+ + (tls_in.active.sock >= 0 ? pcrpted : 0)
+ ];
+
+ sender_host_auth_pubname = sender_host_authenticated = NULL;
+ authenticated_id = NULL;
+ sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING;
+ DEBUG(D_tls) debug_printf("TLS active\n");
+ break; /* Successful STARTTLS */
+ }
+ else
+ (void) smtp_log_tls_fail(s);
- /* Some local configuration problem was discovered before actually trying
- to do a TLS handshake; give a temporary error. */
+ /* Some local configuration problem was discovered before actually trying
+ to do a TLS handshake; give a temporary error. */
- if (rc == DEFER)
- {
- smtp_printf("454 TLS currently unavailable\r\n", FALSE);
- break;
- }
+ if (rc == DEFER)
+ {
+ smtp_printf("454 TLS currently unavailable\r\n", SP_NO_MORE);
+ break;
+ }
- /* Hard failure. Reject everything except QUIT or closed connection. One
- cause for failure is a nested STARTTLS, in which case tls_in.active remains
- set, but we must still reject all incoming commands. */
+ /* Hard failure. Reject everything except QUIT or closed connection. One
+ cause for failure is a nested STARTTLS, in which case tls_in.active remains
+ set, but we must still reject all incoming commands. Another is a handshake
+ failure - and there may some encrypted data still in the pipe to us, which we
+ see as garbage commands. */
- DEBUG(D_tls) debug_printf("TLS failed to start\n");
- while (done <= 0) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
- {
- case EOF_CMD:
- log_write(L_smtp_connection, LOG_MAIN, "%s closed by EOF",
- smtp_get_connection_info());
- smtp_notquit_exit(US"tls-failed", NULL, NULL);
- done = 2;
- break;
+ DEBUG(D_tls) debug_printf("TLS failed to start\n");
+ while (done <= 0) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
+ {
+ case EOF_CMD:
+ log_close_event(US"by EOF");
+ smtp_notquit_exit(US"tls-failed", NULL, NULL);
+ done = 2;
+ break;
- /* It is perhaps arguable as to which exit ACL should be called here,
- but as it is probably a situation that almost never arises, it
- probably doesn't matter. We choose to call the real QUIT ACL, which in
- some sense is perhaps "right". */
-
- case QUIT_CMD:
- user_msg = NULL;
- if ( acl_smtp_quit
- && ((rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, &user_msg,
- &log_msg)) == ERROR))
- log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
- log_msg);
- if (user_msg)
- smtp_respond(US"221", 3, TRUE, user_msg);
- else
- smtp_printf("221 %s closing connection\r\n", FALSE, smtp_active_hostname);
- log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT",
- smtp_get_connection_info());
- done = 2;
- break;
+ /* It is perhaps arguable as to which exit ACL should be called here,
+ but as it is probably a situation that almost never arises, it
+ probably doesn't matter. We choose to call the real QUIT ACL, which in
+ some sense is perhaps "right". */
+
+ case QUIT_CMD:
+ f.smtp_in_quit = TRUE;
+ user_msg = NULL;
+ GET_OPTION("acl_smtp_quit");
+ if ( acl_smtp_quit
+ && ((rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, &user_msg,
+ &log_msg)) == ERROR))
+ log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
+ log_msg);
+ if (user_msg)
+ smtp_respond(US"221", 3, SR_FINAL, user_msg);
+ else
+ smtp_printf("221 %s closing connection\r\n", SP_NO_MORE, smtp_active_hostname);
+ log_close_event(US"by QUIT");
+ done = 2;
+ break;
- default:
- smtp_printf("554 Security failure\r\n", FALSE);
- break;
- }
- tls_close(TRUE, TLS_SHUTDOWN_NOWAIT);
- break;
+ default:
+ smtp_printf("554 Security failure\r\n", SP_NO_MORE);
+ break;
+ }
+ tls_close(NULL, TLS_SHUTDOWN_NOWAIT);
+ break;
#endif
message. */
case QUIT_CMD:
- smtp_quit_handler(&user_msg, &log_msg);
- done = 2;
- break;
+ smtp_quit_handler(&user_msg, &log_msg);
+ done = 2;
+ break;
case RSET_CMD:
- smtp_rset_handler();
- cancel_cutthrough_connection(TRUE, US"RSET received");
- smtp_reset(reset_point);
- toomany = FALSE;
- break;
+ smtp_rset_handler();
+ cancel_cutthrough_connection(TRUE, US"RSET received");
+ reset_point = smtp_reset(reset_point);
+ toomany = FALSE;
+ break;
case NOOP_CMD:
- HAD(SCH_NOOP);
- smtp_printf("250 OK\r\n", FALSE);
- break;
+ HAD(SCH_NOOP);
+ smtp_printf("250 OK\r\n", SP_NO_MORE);
+ break;
/* Show ETRN/EXPN/VRFY if there's an ACL for checking hosts; if actually
response. */
case HELP_CMD:
- HAD(SCH_HELP);
- smtp_printf("214-Commands supported:\r\n", TRUE);
- {
- uschar buffer[256];
- buffer[0] = 0;
- Ustrcat(buffer, " AUTH");
- #ifdef SUPPORT_TLS
- if (tls_in.active < 0 &&
- verify_check_host(&tls_advertise_hosts) != FAIL)
- Ustrcat(buffer, " STARTTLS");
- #endif
- Ustrcat(buffer, " HELO EHLO MAIL RCPT DATA BDAT");
- Ustrcat(buffer, " NOOP QUIT RSET HELP");
- if (acl_smtp_etrn != NULL) Ustrcat(buffer, " ETRN");
- if (acl_smtp_expn != NULL) Ustrcat(buffer, " EXPN");
- if (acl_smtp_vrfy != NULL) Ustrcat(buffer, " VRFY");
- smtp_printf("214%s\r\n", FALSE, buffer);
- }
- break;
+ HAD(SCH_HELP);
+ smtp_printf("214-Commands supported:\r\n214", SP_MORE);
+ smtp_printf(" AUTH", SP_MORE);
+#ifndef DISABLE_TLS
+ if (tls_in.active.sock < 0 &&
+ verify_check_host(&tls_advertise_hosts) != FAIL)
+ smtp_printf(" STARTTLS", SP_MORE);
+#endif
+ smtp_printf(" HELO EHLO MAIL RCPT DATA BDAT", SP_MORE);
+ smtp_printf(" NOOP QUIT RSET HELP", SP_MORE);
+ if (acl_smtp_etrn) smtp_printf(" ETRN", SP_MORE);
+ if (acl_smtp_expn) smtp_printf(" EXPN", SP_MORE);
+ if (acl_smtp_vrfy) smtp_printf(" VRFY", SP_MORE);
+#ifdef EXPERIMENTAL_XCLIENT
+ if (proxy_session || verify_check_host(&hosts_xclient) != FAIL)
+ smtp_printf(" XCLIENT", SP_MORE);
+#endif
+ smtp_printf("\r\n", SP_NO_MORE);
+ break;
case EOF_CMD:
- incomplete_transaction_log(US"connection lost");
- smtp_notquit_exit(US"connection-lost", US"421",
- US"%s lost input connection", smtp_active_hostname);
-
- /* Don't log by default unless in the middle of a message, as some mailers
- just drop the call rather than sending QUIT, and it clutters up the logs.
- */
-
- if (sender_address || recipients_count > 0)
- log_write(L_lost_incoming_connection, LOG_MAIN,
- "unexpected %s while reading SMTP command from %s%s%s D=%s",
- sender_host_unknown ? "EOF" : "disconnection",
- tcp_in_fastopen && !tcp_in_fastopen_logged ? US"TFO " : US"",
- host_and_ident(FALSE), smtp_read_error,
- string_timesince(&smtp_connection_start)
- );
+ incomplete_transaction_log(US"connection lost");
+ smtp_notquit_exit(US"connection-lost", US"421",
+ US"%s lost input connection", smtp_active_hostname);
+
+ /* Don't log by default unless in the middle of a message, as some mailers
+ just drop the call rather than sending QUIT, and it clutters up the logs.
+ */
+
+ if (sender_address || recipients_count > 0)
+ log_write(L_lost_incoming_connection, LOG_MAIN,
+ "unexpected %s while reading SMTP command from %s%s%s D=%s",
+ f.sender_host_unknown ? "EOF" : "disconnection",
+ f.tcp_in_fastopen_logged
+ ? US""
+ : f.tcp_in_fastopen
+ ? f.tcp_in_fastopen_data ? US"TFO* " : US"TFO "
+ : US"",
+ host_and_ident(FALSE), smtp_read_error,
+ string_timesince(&smtp_connection_start)
+ );
- else
- log_write(L_smtp_connection, LOG_MAIN, "%s %slost%s D=%s",
- smtp_get_connection_info(),
- tcp_in_fastopen && !tcp_in_fastopen_logged ? US"TFO " : US"",
- smtp_read_error,
- string_timesince(&smtp_connection_start)
- );
-
- done = 1;
- break;
+ else
+ log_write(L_smtp_connection, LOG_MAIN, "%s %slost%s D=%s",
+ smtp_get_connection_info(),
+ f.tcp_in_fastopen && !f.tcp_in_fastopen_logged ? US"TFO " : US"",
+ smtp_read_error,
+ string_timesince(&smtp_connection_start)
+ );
+
+ done = 1;
+ break;
case ETRN_CMD:
- HAD(SCH_ETRN);
- if (sender_address)
- {
- done = synprot_error(L_smtp_protocol_error, 503, NULL,
- US"ETRN is not permitted inside a transaction");
- break;
- }
+ HAD(SCH_ETRN);
+ if (sender_address)
+ {
+ done = synprot_error(L_smtp_protocol_error, 503, NULL,
+ US"ETRN is not permitted inside a transaction");
+ break;
+ }
- log_write(L_etrn, LOG_MAIN, "ETRN %s received from %s", smtp_cmd_argument,
- host_and_ident(FALSE));
+ log_write(L_etrn, LOG_MAIN, "ETRN %s received from %s", smtp_cmd_argument,
+ host_and_ident(FALSE));
- if ((rc = acl_check(ACL_WHERE_ETRN, NULL, acl_smtp_etrn,
- &user_msg, &log_msg)) != OK)
- {
- done = smtp_handle_acl_fail(ACL_WHERE_ETRN, rc, user_msg, log_msg);
- break;
- }
+ GET_OPTION("acl_smtp_etrn");
+ if ((rc = acl_check(ACL_WHERE_ETRN, NULL, acl_smtp_etrn,
+ &user_msg, &log_msg)) != OK)
+ {
+ done = smtp_handle_acl_fail(ACL_WHERE_ETRN, rc, user_msg, log_msg);
+ break;
+ }
- /* Compute the serialization key for this command. */
+ /* Compute the serialization key for this command. */
- etrn_serialize_key = string_sprintf("etrn-%s\n", smtp_cmd_data);
+ etrn_serialize_key = string_sprintf("etrn-%s\n", smtp_cmd_data);
- /* If a command has been specified for running as a result of ETRN, we
- permit any argument to ETRN. If not, only the # standard form is permitted,
- since that is strictly the only kind of ETRN that can be implemented
- according to the RFC. */
+ /* If a command has been specified for running as a result of ETRN, we
+ permit any argument to ETRN. If not, only the # standard form is permitted,
+ since that is strictly the only kind of ETRN that can be implemented
+ according to the RFC. */
- if (smtp_etrn_command)
- {
- uschar *error;
- BOOL rc;
- etrn_command = smtp_etrn_command;
- deliver_domain = smtp_cmd_data;
- rc = transport_set_up_command(&argv, smtp_etrn_command, TRUE, 0, NULL,
- US"ETRN processing", &error);
- deliver_domain = NULL;
- if (!rc)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "failed to set up ETRN command: %s",
- error);
- smtp_printf("458 Internal failure\r\n", FALSE);
- break;
- }
- }
+ GET_OPTION("smtp_etrn_command");
+ if (smtp_etrn_command)
+ {
+ uschar *error;
+ BOOL rc;
+ etrn_command = smtp_etrn_command;
+ deliver_domain = smtp_cmd_data;
+ rc = transport_set_up_command(&argv, smtp_etrn_command, TSUC_EXPAND_ARGS, 0, NULL,
+ US"ETRN processing", &error);
+ deliver_domain = NULL;
+ if (!rc)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "failed to set up ETRN command: %s",
+ error);
+ smtp_printf("458 Internal failure\r\n", SP_NO_MORE);
+ break;
+ }
+ }
- /* Else set up to call Exim with the -R option. */
+ /* Else set up to call Exim with the -R option. */
- else
- {
- if (*smtp_cmd_data++ != '#')
- {
- done = synprot_error(L_smtp_syntax_error, 501, NULL,
- US"argument must begin with #");
- break;
- }
- etrn_command = US"exim -R";
- argv = CUSS child_exec_exim(CEE_RETURN_ARGV, TRUE, NULL, TRUE,
- *queue_name ? 4 : 2,
- US"-R", smtp_cmd_data,
- US"-MCG", queue_name);
- }
+ else
+ {
+ if (*smtp_cmd_data++ != '#')
+ {
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"argument must begin with #");
+ break;
+ }
+ etrn_command = US"exim -R";
+ argv = CUSS child_exec_exim(CEE_RETURN_ARGV, TRUE, NULL, TRUE,
+ *queue_name ? 4 : 2,
+ US"-R", smtp_cmd_data,
+ US"-MCG", queue_name);
+ }
- /* If we are host-testing, don't actually do anything. */
+ /* If we are host-testing, don't actually do anything. */
- if (host_checking)
- {
- HDEBUG(D_any)
- {
- debug_printf("ETRN command is: %s\n", etrn_command);
- debug_printf("ETRN command execution skipped\n");
- }
- if (user_msg == NULL) smtp_printf("250 OK\r\n", FALSE);
- else smtp_user_msg(US"250", user_msg);
- break;
- }
+ if (host_checking)
+ {
+ HDEBUG(D_any)
+ {
+ debug_printf("ETRN command is: %s\n", etrn_command);
+ debug_printf("ETRN command execution skipped\n");
+ }
+ if (user_msg == NULL) smtp_printf("250 OK\r\n", SP_NO_MORE);
+ else smtp_user_msg(US"250", user_msg);
+ break;
+ }
- /* If ETRN queue runs are to be serialized, check the database to
- ensure one isn't already running. */
+ /* If ETRN queue runs are to be serialized, check the database to
+ ensure one isn't already running. */
- if (smtp_etrn_serialize && !enq_start(etrn_serialize_key, 1))
- {
- smtp_printf("458 Already processing %s\r\n", FALSE, smtp_cmd_data);
- break;
- }
+ if (smtp_etrn_serialize && !enq_start(etrn_serialize_key, 1))
+ {
+ smtp_printf("458 Already processing %s\r\n", SP_NO_MORE, smtp_cmd_data);
+ break;
+ }
- /* Fork a child process and run the command. We don't want to have to
- wait for the process at any point, so set SIGCHLD to SIG_IGN before
- forking. It should be set that way anyway for external incoming SMTP,
- but we save and restore to be tidy. If serialization is required, we
- actually run the command in yet another process, so we can wait for it
- to complete and then remove the serialization lock. */
+ /* Fork a child process and run the command. We don't want to have to
+ wait for the process at any point, so set SIGCHLD to SIG_IGN before
+ forking. It should be set that way anyway for external incoming SMTP,
+ but we save and restore to be tidy. If serialization is required, we
+ actually run the command in yet another process, so we can wait for it
+ to complete and then remove the serialization lock. */
- oldsignal = signal(SIGCHLD, SIG_IGN);
+ oldsignal = signal(SIGCHLD, SIG_IGN);
- if ((pid = fork()) == 0)
- {
- smtp_input = FALSE; /* This process is not associated with the */
- (void)fclose(smtp_in); /* SMTP call any more. */
- (void)fclose(smtp_out);
+ if ((pid = exim_fork(US"etrn-command")) == 0)
+ {
+ smtp_input = FALSE; /* This process is not associated with the */
+ (void)fclose(smtp_in); /* SMTP call any more. */
+ (void)fclose(smtp_out);
- signal(SIGCHLD, SIG_DFL); /* Want to catch child */
+ signal(SIGCHLD, SIG_DFL); /* Want to catch child */
- /* If not serializing, do the exec right away. Otherwise, fork down
- into another process. */
+ /* If not serializing, do the exec right away. Otherwise, fork down
+ into another process. */
- if (!smtp_etrn_serialize || (pid = fork()) == 0)
- {
- DEBUG(D_exec) debug_print_argv(argv);
- exim_nullstd(); /* Ensure std{in,out,err} exist */
- execv(CS argv[0], (char *const *)argv);
- log_write(0, LOG_MAIN|LOG_PANIC_DIE, "exec of \"%s\" (ETRN) failed: %s",
- etrn_command, strerror(errno));
- _exit(EXIT_FAILURE); /* paranoia */
- }
+ if ( !smtp_etrn_serialize
+ || (pid = exim_fork(US"etrn-serialised-command")) == 0)
+ {
+ DEBUG(D_exec) debug_print_argv(argv);
+ exim_nullstd(); /* Ensure std{in,out,err} exist */
+ /* argv[0] should be untainted, from child_exec_exim() */
+ execv(CS argv[0], (char *const *)argv);
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "exec of \"%s\" (ETRN) failed: %s",
+ etrn_command, strerror(errno));
+ _exit(EXIT_FAILURE); /* paranoia */
+ }
- /* Obey this if smtp_serialize and the 2nd fork yielded non-zero. That
- is, we are in the first subprocess, after forking again. All we can do
- for a failing fork is to log it. Otherwise, wait for the 2nd process to
- complete, before removing the serialization. */
+ /* Obey this if smtp_serialize and the 2nd fork yielded non-zero. That
+ is, we are in the first subprocess, after forking again. All we can do
+ for a failing fork is to log it. Otherwise, wait for the 2nd process to
+ complete, before removing the serialization. */
- if (pid < 0)
- log_write(0, LOG_MAIN|LOG_PANIC, "2nd fork for serialized ETRN "
- "failed: %s", strerror(errno));
- else
- {
- int status;
- DEBUG(D_any) debug_printf("waiting for serialized ETRN process %d\n",
- (int)pid);
- (void)wait(&status);
- DEBUG(D_any) debug_printf("serialized ETRN process %d ended\n",
- (int)pid);
- }
+ if (pid < 0)
+ log_write(0, LOG_MAIN|LOG_PANIC, "2nd fork for serialized ETRN "
+ "failed: %s", strerror(errno));
+ else
+ {
+ int status;
+ DEBUG(D_any) debug_printf("waiting for serialized ETRN process %d\n",
+ (int)pid);
+ (void)wait(&status);
+ DEBUG(D_any) debug_printf("serialized ETRN process %d ended\n",
+ (int)pid);
+ }
- enq_end(etrn_serialize_key);
- _exit(EXIT_SUCCESS);
- }
+ enq_end(etrn_serialize_key);
+ exim_underbar_exit(EXIT_SUCCESS);
+ }
- /* Back in the top level SMTP process. Check that we started a subprocess
- and restore the signal state. */
+ /* Back in the top level SMTP process. Check that we started a subprocess
+ and restore the signal state. */
- if (pid < 0)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "fork of process for ETRN failed: %s",
- strerror(errno));
- smtp_printf("458 Unable to fork process\r\n", FALSE);
- if (smtp_etrn_serialize) enq_end(etrn_serialize_key);
- }
- else
- {
- if (user_msg == NULL) smtp_printf("250 OK\r\n", FALSE);
- else smtp_user_msg(US"250", user_msg);
- }
+ if (pid < 0)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "fork of process for ETRN failed: %s",
+ strerror(errno));
+ smtp_printf("458 Unable to fork process\r\n", SP_NO_MORE);
+ if (smtp_etrn_serialize) enq_end(etrn_serialize_key);
+ }
+ else
+ if (!user_msg)
+ smtp_printf("250 OK\r\n", SP_NO_MORE);
+ else
+ smtp_user_msg(US"250", user_msg);
- signal(SIGCHLD, oldsignal);
- break;
+ signal(SIGCHLD, oldsignal);
+ break;
case BADARG_CMD:
- done = synprot_error(L_smtp_syntax_error, 501, NULL,
- US"unexpected argument data");
- break;
+ done = synprot_error(L_smtp_syntax_error, 501, NULL,
+ US"unexpected argument data");
+ break;
/* This currently happens only for NULLs, but could be extended. */
case BADCHAR_CMD:
- done = synprot_error(L_smtp_syntax_error, 0, NULL, /* Just logs */
- US"NUL character(s) present (shown as '?')");
- smtp_printf("501 NUL characters are not allowed in SMTP commands\r\n", FALSE);
- break;
+ done = synprot_error(L_smtp_syntax_error, 0, NULL, /* Just logs */
+ US"NUL character(s) present (shown as '?')");
+ smtp_printf("501 NUL characters are not allowed in SMTP commands\r\n",
+ SP_NO_MORE);
+ break;
case BADSYN_CMD:
SYNC_FAILURE:
- if (smtp_inend >= smtp_inbuffer + IN_BUFFER_SIZE)
- smtp_inend = smtp_inbuffer + IN_BUFFER_SIZE - 1;
- c = smtp_inend - smtp_inptr;
- if (c > 150) c = 150; /* limit logged amount */
- smtp_inptr[c] = 0;
- incomplete_transaction_log(US"sync failure");
- log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error "
- "(next input sent too soon: pipelining was%s advertised): "
- "rejected \"%s\" %s next input=\"%s\"",
- pipelining_advertised? "" : " not",
- smtp_cmd_buffer, host_and_ident(TRUE),
- string_printing(smtp_inptr));
- smtp_notquit_exit(US"synchronization-error", US"554",
- US"SMTP synchronization error");
- done = 1; /* Pretend eof - drops connection */
- break;
+ {
+ unsigned nchars = 150;
+ uschar * buf = receive_getbuf(&nchars); /* destructive read */
+ buf[nchars] = '\0';
+ incomplete_transaction_log(US"sync failure");
+ log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error "
+ "(next input sent too soon: pipelining was%s advertised): "
+ "rejected \"%s\" %s next input=\"%s\" (%u bytes)",
+ f.smtp_in_pipelining_advertised ? "" : " not",
+ smtp_cmd_buffer, host_and_ident(TRUE),
+ string_printing(buf), nchars);
+ smtp_notquit_exit(US"synchronization-error", US"554",
+ US"SMTP synchronization error");
+ done = 1; /* Pretend eof - drops connection */
+ break;
+ }
case TOO_MANY_NONMAIL_CMD:
- s = smtp_cmd_buffer;
- while (*s != 0 && !isspace(*s)) s++;
- incomplete_transaction_log(US"too many non-mail commands");
- log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
- "nonmail commands (last was \"%.*s\")", host_and_ident(FALSE),
- (int)(s - smtp_cmd_buffer), smtp_cmd_buffer);
- smtp_notquit_exit(US"bad-commands", US"554", US"Too many nonmail commands");
- done = 1; /* Pretend eof - drops connection */
- break;
+ s = smtp_cmd_buffer;
+ Uskip_nonwhite(&s);
+ incomplete_transaction_log(US"too many non-mail commands");
+ log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
+ "nonmail commands (last was \"%.*s\")", host_and_ident(FALSE),
+ (int)(s - smtp_cmd_buffer), smtp_cmd_buffer);
+ smtp_notquit_exit(US"bad-commands", US"554", US"Too many nonmail commands");
+ done = 1; /* Pretend eof - drops connection */
+ break;
#ifdef SUPPORT_PROXY
case PROXY_FAIL_IGNORE_CMD:
- smtp_printf("503 Command refused, required Proxy negotiation failed\r\n", FALSE);
- break;
+ smtp_printf("503 Command refused, required Proxy negotiation failed\r\n", SP_NO_MORE);
+ break;
#endif
default:
- if (unknown_command_count++ >= smtp_max_unknown_commands)
- {
- log_write(L_smtp_syntax_error, LOG_MAIN,
- "SMTP syntax error in \"%s\" %s %s",
- string_printing(smtp_cmd_buffer), host_and_ident(TRUE),
- US"unrecognized command");
- incomplete_transaction_log(US"unrecognized command");
- smtp_notquit_exit(US"bad-commands", US"500",
- US"Too many unrecognized commands");
- done = 2;
- log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
- "unrecognized commands (last was \"%s\")", host_and_ident(FALSE),
- string_printing(smtp_cmd_buffer));
- }
- else
- done = synprot_error(L_smtp_syntax_error, 500, NULL,
- US"unrecognized command");
- break;
+ if (unknown_command_count++ >= smtp_max_unknown_commands)
+ {
+ log_write(L_smtp_syntax_error, LOG_MAIN,
+ "SMTP syntax error in \"%s\" %s %s",
+ string_printing(smtp_cmd_buffer), host_and_ident(TRUE),
+ US"unrecognized command");
+ incomplete_transaction_log(US"unrecognized command");
+ smtp_notquit_exit(US"bad-commands", US"500",
+ US"Too many unrecognized commands");
+ done = 2;
+ log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many "
+ "unrecognized commands (last was \"%s\")", host_and_ident(FALSE),
+ string_printing(smtp_cmd_buffer));
+ }
+ else
+ done = synprot_error(L_smtp_syntax_error, 500, NULL,
+ US"unrecognized command");
+ break;
}
/* This label is used by goto's inside loops that want to break out to
COMMAND_LOOP:
last_was_rej_mail = was_rej_mail; /* Remember some last commands for */
last_was_rcpt = was_rcpt; /* protocol error handling */
- continue;
}
return done - 2; /* Convert yield values */
g = string_append(g, 2, US";\n\tauth=pass (", sender_host_auth_pubname);
-if (Ustrcmp(sender_host_auth_pubname, "tls") != 0)
- g = string_append(g, 2, US") smtp.auth=", authenticated_id);
-else if (authenticated_id)
- g = string_append(g, 2, US") x509.auth=", authenticated_id);
+if (Ustrcmp(sender_host_auth_pubname, "tls") == 0)
+ g = authenticated_id
+ ? string_append(g, 2, US") x509.auth=", authenticated_id)
+ : string_cat(g, US") reason=x509.auth");
else
- g = string_catn(g, US") reason=x509.auth", 17);
+ g = authenticated_id
+ ? string_append(g, 2, US") smtp.auth=", authenticated_id)
+ : string_cat(g, US", no id saved)");
if (authenticated_sender)
g = string_append(g, 2, US" smtp.mailfrom=", authenticated_sender);
git://git.exim.org / exim.git / blobdiff