-/* $Cambridge: exim/src/src/smtp_in.c,v 1.9 2005/01/13 16:15:53 ph10 Exp $ */
+/* $Cambridge: exim/src/src/smtp_in.c,v 1.49 2007/01/08 10:50:18 ph10 Exp $ */
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2005 */
+/* Copyright (c) University of Cambridge 1995 - 2007 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions for handling an incoming SMTP call. */
#endif
-/* Size of buffer for reading SMTP commands */
+/* Size of buffer for reading SMTP commands. We used to use 512, as defined
+by RFC 821. However, RFC 1869 specifies that this must be increased for SMTP
+commands that accept arguments, and this in particular applies to AUTH, where
+the data can be quite long. */
-#define cmd_buffer_size 512 /* Ref. RFC 821 */
+#define smtp_cmd_buffer_size 2048
/* Size of buffer for reading SMTP incoming packets */
static int sync_cmd_limit;
static int smtp_write_error = 0;
-static uschar *smtp_data;
-
-static uschar *cmd_buffer;
-
/* We need to know the position of RSET, HELO, EHLO, AUTH, and STARTTLS. Their
final fields of all except AUTH are forced TRUE at the start of a new message
setup, to allow one of each between messages that is not counted as a nonmail
DEBUG(D_receive)
{
+ uschar *cr, *end;
va_start(ap, format);
(void) string_vformat(big_buffer, big_buffer_size, format, ap);
+ va_end(ap);
+ end = big_buffer + Ustrlen(big_buffer);
+ while ((cr = Ustrchr(big_buffer, '\r')) != NULL) /* lose CRs */
+ memmove(cr, cr + 1, (end--) - cr);
debug_printf("SMTP>> %s", big_buffer);
}
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 static cmd_buffer.
+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
while ((c = (receive_getc)()) != '\n' && c != EOF)
{
- if (ptr >= cmd_buffer_size)
+ if (ptr >= smtp_cmd_buffer_size)
{
os_non_restarting_signal(SIGALRM, sigalrm_handler);
return OTHER_CMD;
hadnull = TRUE;
c = '?';
}
- cmd_buffer[ptr++] = c;
+ smtp_cmd_buffer[ptr++] = c;
}
receive_linecount++; /* For BSMTP errors */
/* Remove any CR and white space at the end of the line, and terminate the
string. */
-while (ptr > 0 && isspace(cmd_buffer[ptr-1])) ptr--;
-cmd_buffer[ptr] = 0;
+while (ptr > 0 && isspace(smtp_cmd_buffer[ptr-1])) ptr--;
+smtp_cmd_buffer[ptr] = 0;
-DEBUG(D_receive) debug_printf("SMTP<< %s\n", cmd_buffer);
+DEBUG(D_receive) debug_printf("SMTP<< %s\n", smtp_cmd_buffer);
/* NULLs are not allowed in SMTP commands */
for (p = cmd_list; p < cmd_list_end; p++)
{
- if (strncmpic(cmd_buffer, US p->name, p->len) == 0)
+ if (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 */
the following test, so that if it fails, the command name can easily be
logged. */
- smtp_data = cmd_buffer + p->len;
+ smtp_cmd_argument = smtp_cmd_buffer + p->len;
/* 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
return TOO_MANY_NONMAIL_CMD;
}
- /* Get the data pointer over leading spaces and return; if there is no data
- for a command that expects it, we give the error centrally here. */
+ /* Get the data pointer over leading spaces and return; if there is data
+ for a command that does not expect it, give the error centrally here. */
- while (isspace(*smtp_data)) smtp_data++;
- return (p->has_arg || *smtp_data == 0)? p->cmd : BADARG_CMD;
+ while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++;
+ return (p->has_arg || *smtp_cmd_argument == 0)? p->cmd : BADARG_CMD;
}
}
/* This function is called when logging information about an SMTP connection.
It sets up appropriate source information, depending on the type of connection.
+If sender_fullhost is NULL, we are at a very early stage of the connection;
+just use the IP address.
Argument: none
Returns: a string describing the connection
uschar *
smtp_get_connection_info(void)
{
+uschar *hostname = (sender_fullhost == NULL)?
+ sender_host_address : sender_fullhost;
+
if (host_checking)
- return string_sprintf("SMTP connection from %s", sender_fullhost);
+ return string_sprintf("SMTP connection from %s", hostname);
if (sender_host_unknown || sender_host_notsocket)
return string_sprintf("SMTP connection from %s", sender_ident);
if (is_inetd)
- return string_sprintf("SMTP connection from %s (via inetd)", sender_fullhost);
+ return string_sprintf("SMTP connection from %s (via inetd)", hostname);
if ((log_extra_selector & LX_incoming_interface) != 0 &&
interface_address != NULL)
- return string_sprintf("SMTP connection from %s I=[%s]:%d", sender_fullhost,
+ return string_sprintf("SMTP connection from %s I=[%s]:%d", hostname,
interface_address, interface_port);
-return string_sprintf("SMTP connection from %s", sender_fullhost);
+return string_sprintf("SMTP connection from %s", hostname);
}
* Extract SMTP command option *
*************************************************/
-/* This function picks the next option setting off the end of smtp_data. It
+/* This function picks the next option setting off the end of smtp_cmd_argument. It
is called for MAIL FROM and RCPT TO commands, to pick off the optional ESMTP
things that can appear there.
extract_option(uschar **name, uschar **value)
{
uschar *n;
-uschar *v = smtp_data + Ustrlen(smtp_data) -1;
+uschar *v = smtp_cmd_argument + Ustrlen(smtp_cmd_argument) -1;
while (isspace(*v)) v--;
v[1] = 0;
-while (v > smtp_data && *v != '=' && !isspace(*v)) v--;
+while (v > smtp_cmd_argument && *v != '=' && !isspace(*v)) v--;
if (*v != '=') return FALSE;
n = v;
-
-
/*************************************************
* Reset for new message *
*************************************************/
static void
smtp_reset(void *reset_point)
{
-int i;
store_reset(reset_point);
recipients_list = NULL;
rcpt_count = rcpt_defer_count = rcpt_fail_count =
raw_recipients_count = recipients_count = recipients_list_max = 0;
+message_linecount = 0;
message_size = -1;
-acl_warn_headers = NULL;
+acl_added_headers = NULL;
queue_only_policy = FALSE;
deliver_freeze = FALSE; /* Can be set by ACL */
-fake_reject = 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 */
#endif
submission_mode = FALSE; /* Can be set by ACL */
+suppress_local_fixups = FALSE; /* 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 */
sender_address = NULL;
+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_run = 0;
bmi_verdicts = NULL;
#endif
+#ifdef EXPERIMENTAL_DOMAINKEYS
+dk_do_verify = 0;
+#endif
#ifdef EXPERIMENTAL_SPF
spf_header_comment = NULL;
spf_received = NULL;
-spf_result = NULL;
+spf_result = NULL;
spf_smtp_comment = NULL;
#endif
body_linecount = body_zerocount = 0;
-for (i = 0; i < ACL_M_MAX; i++) acl_var[ACL_C_MAX + i] = NULL;
+sender_rate = sender_rate_limit = sender_rate_period = NULL;
+ratelimiters_mail = NULL; /* Updated by ratelimit ACL condition */
+ /* Note that ratelimiters_conn persists across resets. */
+
+/* Reset message ACL variables */
+
+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
/* Warning log messages are also saved in malloc store. They are saved to avoid
repetition in the same message, but it seems right to repeat them for different
-messagess. */
+messages. */
while (acl_warn_logged != NULL)
{
case HELO_CMD:
case EHLO_CMD:
- check_helo(smtp_data);
+ check_helo(smtp_cmd_argument);
/* Fall through */
case RSET_CMD:
case MAIL_CMD:
if (sender_address != NULL)
/* The function moan_smtp_batch() does not return. */
- moan_smtp_batch(cmd_buffer, "503 Sender already given");
+ moan_smtp_batch(smtp_cmd_buffer, "503 Sender already given");
- if (smtp_data[0] == 0)
+ if (smtp_cmd_argument[0] == 0)
/* The function moan_smtp_batch() does not return. */
- moan_smtp_batch(cmd_buffer, "501 MAIL FROM must have an address operand");
+ moan_smtp_batch(smtp_cmd_buffer, "501 MAIL FROM must have an address operand");
/* Reset to start of message */
/* Apply SMTP rewrite */
raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)?
- rewrite_one(smtp_data, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE,
- US"", global_rewrite_rules) : smtp_data;
+ rewrite_one(smtp_cmd_argument, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE,
+ US"", global_rewrite_rules) : smtp_cmd_argument;
/* Extract the address; the TRUE flag allows <> as valid */
if (raw_sender == NULL)
/* The function moan_smtp_batch() does not return. */
- moan_smtp_batch(cmd_buffer, "501 %s", errmess);
+ moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess);
sender_address = string_copy(raw_sender);
"and rewritten\n", raw_sender);
}
/* The function moan_smtp_batch() does not return. */
- else moan_smtp_batch(cmd_buffer, "501 sender address must contain "
+ else moan_smtp_batch(smtp_cmd_buffer, "501 sender address must contain "
"a domain");
}
break;
case RCPT_CMD:
if (sender_address == NULL)
/* The function moan_smtp_batch() does not return. */
- moan_smtp_batch(cmd_buffer, "503 No sender yet given");
+ moan_smtp_batch(smtp_cmd_buffer, "503 No sender yet given");
- if (smtp_data[0] == 0)
+ if (smtp_cmd_argument[0] == 0)
/* The function moan_smtp_batch() does not return. */
- moan_smtp_batch(cmd_buffer, "501 RCPT TO must have an address operand");
+ moan_smtp_batch(smtp_cmd_buffer, "501 RCPT TO must have an address operand");
/* Check maximum number allowed */
if (recipients_max > 0 && recipients_count + 1 > recipients_max)
/* The function moan_smtp_batch() does not return. */
- moan_smtp_batch(cmd_buffer, "%s too many recipients",
+ moan_smtp_batch(smtp_cmd_buffer, "%s too many recipients",
recipients_max_reject? "552": "452");
/* Apply SMTP rewrite, then extract address. Don't allow "<>" as a
recipient address */
recipient = ((rewrite_existflags & rewrite_smtp) != 0)?
- rewrite_one(smtp_data, rewrite_smtp, NULL, FALSE, US"",
- global_rewrite_rules) : smtp_data;
+ rewrite_one(smtp_cmd_argument, rewrite_smtp, NULL, FALSE, US"",
+ global_rewrite_rules) : smtp_cmd_argument;
/* rfc821_domains = TRUE; << no longer needed */
recipient = parse_extract_address(recipient, &errmess, &start, &end,
if (recipient == NULL)
/* The function moan_smtp_batch() does not return. */
- moan_smtp_batch(cmd_buffer, "501 %s", errmess);
+ moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess);
/* If the recipient address is unqualified, qualify it if permitted. Then
add it to the list of recipients. */
recipient = rewrite_address_qualify(recipient, TRUE);
}
/* The function moan_smtp_batch() does not return. */
- else moan_smtp_batch(cmd_buffer, "501 recipient address must contain "
+ else moan_smtp_batch(smtp_cmd_buffer, "501 recipient address must contain "
"a domain");
}
receive_add_recipient(recipient, -1);
{
/* The function moan_smtp_batch() does not return. */
if (sender_address == NULL)
- moan_smtp_batch(cmd_buffer,
+ moan_smtp_batch(smtp_cmd_buffer,
"503 MAIL FROM:<sender> command must precede DATA");
else
- moan_smtp_batch(cmd_buffer,
+ moan_smtp_batch(smtp_cmd_buffer,
"503 RCPT TO:<recipient> must precede DATA");
}
else
case BADARG_CMD:
/* The function moan_smtp_batch() does not return. */
- moan_smtp_batch(cmd_buffer, "501 Unexpected argument data");
+ moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected argument data");
break;
case BADCHAR_CMD:
/* The function moan_smtp_batch() does not return. */
- moan_smtp_batch(cmd_buffer, "501 Unexpected NULL in SMTP command");
+ moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected NULL in SMTP command");
break;
default:
/* The function moan_smtp_batch() does not return. */
- moan_smtp_batch(cmd_buffer, "500 Command unrecognized");
+ moan_smtp_batch(smtp_cmd_buffer, "500 Command unrecognized");
break;
}
}
smtp_start_session(void)
{
int size = 256;
-int i, ptr;
+int ptr, esclen;
+uschar *user_msg, *log_msg;
+uschar *code, *esc;
uschar *p, *s, *ss;
-/* If we are running in the test harness, and the incoming call is from
-127.0.0.2 (sic), have a short delay. This makes it possible to test handling of
-input sent too soon (before the banner is output). */
-
-if (running_in_test_harness && Ustrcmp(sender_host_address, "127.0.0.2") == 0)
- sleep(1);
-
/* Default values for certain variables */
helo_seen = esmtp = helo_accept_junk = FALSE;
memset(sender_host_cache, 0, sizeof(sender_host_cache));
-sender_host_authenticated = NULL;
+/* 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) sender_host_authenticated = NULL;
authenticated_by = NULL;
#ifdef SUPPORT_TLS
/* Reset ACL connection variables */
-for (i = 0; i < ACL_C_MAX; i++) acl_var[i] = NULL;
+acl_var_c = NULL;
+
+/* Allow for trailing 0 in the command buffer. */
-cmd_buffer = (uschar *)malloc(cmd_buffer_size + 1); /* allow for trailing 0 */
-if (cmd_buffer == NULL)
+smtp_cmd_buffer = (uschar *)malloc(smtp_cmd_buffer_size + 1);
+if (smtp_cmd_buffer == NULL)
log_write(0, LOG_MAIN|LOG_PANIC_DIE,
"malloc() failed for SMTP command buffer");
/* Set up the message size limit; this may be host-specific */
-thismessage_size_limit = expand_string_integer(message_size_limit);
-if (thismessage_size_limit < 0)
+thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
+if (expand_string_message != NULL)
{
if (thismessage_size_limit == -1)
log_write(0, LOG_MAIN|LOG_PANIC, "unable to expand message_size_limit: "
if (!host_checking && !sender_host_notsocket)
{
#if OPTSTYLE == 1
- SOCKLEN_T optlen = sizeof(struct ip_options) + MAX_IPOPTLEN;
+ EXIM_SOCKLEN_T optlen = sizeof(struct ip_options) + MAX_IPOPTLEN;
struct ip_options *ipopt = store_get(optlen);
#elif OPTSTYLE == 2
struct ip_opts ipoptblock;
struct ip_opts *ipopt = &ipoptblock;
- SOCKLEN_T optlen = sizeof(ipoptblock);
+ EXIM_SOCKLEN_T optlen = sizeof(ipoptblock);
#else
struct ipoption ipoptblock;
struct ipoption *ipopt = &ipoptblock;
- SOCKLEN_T optlen = sizeof(ipoptblock);
+ EXIM_SOCKLEN_T optlen = sizeof(ipoptblock);
#endif
/* Occasional genuine failures of getsockopt() have been seen - for
return FALSE;
}
- /* Test with TCP Wrappers if so configured */
+ /* Test with TCP Wrappers if so configured. There is a problem in that
+ hosts_ctl() returns 0 (deny) under a number of system failure circumstances,
+ such as disks dying. In these cases, it is desirable to reject with a 4xx
+ error instead of a 5xx error. There isn't a "right" way to detect such
+ problems. The following kludge is used: errno is zeroed before calling
+ hosts_ctl(). If the result is "reject", a 5xx error is given only if the
+ value of errno is 0 or ENOENT (which happens if /etc/hosts.{allow,deny} does
+ not exist). */
#ifdef USE_TCP_WRAPPERS
+ errno = 0;
if (!hosts_ctl("exim",
(sender_host_name == NULL)? STRING_UNKNOWN : CS sender_host_name,
(sender_host_address == NULL)? STRING_UNKNOWN : CS sender_host_address,
(sender_ident == NULL)? STRING_UNKNOWN : CS sender_ident))
{
- HDEBUG(D_receive) debug_printf("tcp wrappers rejection\n");
- 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");
+ if (errno == 0 || errno == ENOENT)
+ {
+ HDEBUG(D_receive) debug_printf("tcp wrappers rejection\n");
+ 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");
+ }
+ else
+ {
+ int save_errno = errno;
+ HDEBUG(D_receive) debug_printf("tcp wrappers rejected with unexpected "
+ "errno value %d\n", save_errno);
+ 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");
+ }
return FALSE;
}
#endif
/* Run the ACL if it exists */
+user_msg = NULL;
if (acl_smtp_connect != NULL)
{
int rc;
- uschar *user_msg, *log_msg;
- smtp_data = US"in \"connect\" ACL"; /* For logged failure message */
- rc = acl_check(ACL_WHERE_CONNECT, US"", acl_smtp_connect, &user_msg,
+ rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg,
&log_msg);
if (rc != OK)
{
/* Output the initial message for a two-way SMTP connection. It may contain
newlines, which then cause a multi-line response to be given. */
-s = expand_string(smtp_banner);
-if (s == NULL)
- log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) "
- "failed: %s", smtp_banner, expand_string_message);
+code = US"220"; /* Default status code */
+esc = US""; /* Default extended status code */
+esclen = 0; /* Length of esc */
+
+if (user_msg == NULL)
+ {
+ s = expand_string(smtp_banner);
+ if (s == NULL)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) "
+ "failed: %s", smtp_banner, expand_string_message);
+ }
+else
+ {
+ int codelen = 3;
+ s = user_msg;
+ smtp_message_code(&code, &codelen, &s, NULL);
+ if (codelen > 4)
+ {
+ esc = code + 4;
+ esclen = codelen - 4;
+ }
+ }
/* Remove any terminating newlines; might as well remove trailing space too */
{
int len;
uschar *linebreak = Ustrchr(p, '\n');
+ ss = string_cat(ss, &size, &ptr, code, 3);
if (linebreak == NULL)
{
len = Ustrlen(p);
- ss = string_cat(ss, &size, &ptr, US"220 ", 4);
+ ss = string_cat(ss, &size, &ptr, US" ", 1);
}
else
{
len = linebreak - p;
- ss = string_cat(ss, &size, &ptr, US"220-", 4);
+ ss = string_cat(ss, &size, &ptr, US"-", 1);
}
+ ss = string_cat(ss, &size, &ptr, esc, esclen);
ss = string_cat(ss, &size, &ptr, p, len);
ss = string_cat(ss, &size, &ptr, US"\r\n", 2);
p += len;
&tzero) > 0)
{
int rc = read(fileno(smtp_in), smtp_inbuffer, in_buffer_size);
- if (rc > 150) rc = 150;
- smtp_inbuffer[rc] = 0;
- log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol violation: "
- "synchronization error (input sent without waiting for greeting): "
- "rejected connection from %s input=\"%s\"", host_and_ident(TRUE),
- string_printing(smtp_inbuffer));
- smtp_printf("554 SMTP synchronization error\r\n");
- return FALSE;
+ if (rc > 0)
+ {
+ if (rc > 150) rc = 150;
+ smtp_inbuffer[rc] = 0;
+ 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(smtp_inbuffer));
+ smtp_printf("554 SMTP synchronization error\r\n");
+ return FALSE;
+ }
}
}
log_write(type, LOG_MAIN, "SMTP %s error in \"%s\" %s %s",
(type == L_smtp_syntax_error)? "syntax" : "protocol",
- string_printing(cmd_buffer), host_and_ident(TRUE), errmess);
+ 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), cmd_buffer);
+ host_and_ident(FALSE), smtp_cmd_buffer);
}
if (code > 0)
output nothing for non-final calls, and only the first line for anything else.
Arguments:
- code SMTP code
+ code SMTP code, may involve extended status codes
+ codelen length of smtp code; if > 4 there's an ESC
final FALSE if the last line isn't the final line
msg message text, possibly containing newlines
*/
void
-smtp_respond(int code, 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 (codelen > 4)
+ {
+ esc = code + 4;
+ esclen = codelen - 4;
+ }
+
for (;;)
{
uschar *nl = Ustrchr(msg, '\n');
if (nl == NULL)
{
- smtp_printf("%d%c%s\r\n", code, final? ' ':'-', msg);
+ smtp_printf("%.3s%c%.*s%s\r\n", code, final? ' ':'-', esclen, esc, msg);
return;
}
else if (nl[1] == 0 || no_multiline_responses)
{
- smtp_printf("%d%c%.*s\r\n", code, final? ' ':'-', (int)(nl - msg), msg);
+ smtp_printf("%.3s%c%.*s%.*s\r\n", code, final? ' ':'-', esclen, esc,
+ (int)(nl - msg), msg);
return;
}
else
{
- smtp_printf("%d-%.*s\r\n", code, (int)(nl - msg), msg);
+ smtp_printf("%.3s-%.*s%.*s\r\n", code, esclen, esc, (int)(nl - msg), msg);
msg = nl + 1;
while (isspace(*msg)) msg++;
}
+/*************************************************
+* Parse user SMTP message *
+*************************************************/
+
+/* This function allows for user messages overriding the response code details
+by providing a suitable response code string at the start of the message
+user_msg. Check the message for starting with a response code and optionally an
+extended status code. If found, check that the first digit is valid, and if so,
+change the code pointer and length to use the replacement. An invalid code
+causes a panic log; in this case, if the log messages is the same as the user
+message, we must also adjust the value of the log message to show the code that
+is actually going to be used (the original one).
+
+This function is global because it is called from receive.c as well as within
+this module.
+
+Note that the code length returned includes the terminating whitespace
+character, which is always included in the regex match.
+
+Arguments:
+ code SMTP code, may involve extended status codes
+ codelen length of smtp code; if > 4 there's an ESC
+ msg message text
+ log_msg optional log message, to be adjusted with the new SMTP code
+
+Returns: nothing
+*/
+
+void
+smtp_message_code(uschar **code, int *codelen, uschar **msg, uschar **log_msg)
+{
+int n;
+int ovector[3];
+
+if (msg == NULL || *msg == NULL) return;
+
+n = pcre_exec(regex_smtp_code, NULL, CS *msg, Ustrlen(*msg), 0,
+ PCRE_EOPT, ovector, sizeof(ovector)/sizeof(int));
+if (n < 0) return;
+
+if ((*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]);
+ }
+else
+ {
+ *code = *msg;
+ *codelen = ovector[1]; /* Includes final space */
+ }
+*msg += ovector[1]; /* Chop the code off the message */
+return;
+}
+
+
+
+
/*************************************************
* Handle an ACL failure *
*************************************************/
newlines is turned into a multiline SMTP response, but for logging, only the
first line is used.
-There's a table of the response codes to use in globals.c, along with the table
-of names. VFRY is special. Despite RFC1123 it defaults disabled in Exim.
-However, discussion in connection with RFC 821bis (aka RFC 2821) has concluded
-that the response should be 252 in the disabled state, because there are broken
-clients that try VRFY before RCPT. A 5xx response should be given only when the
-address is positively known to be undeliverable. Sigh. Also, for ETRN, 458 is
-given on refusal, and for AUTH, 503.
+There's a table of default permanent failure response codes to use in
+globals.c, along with the table of names. VFRY is special. Despite RFC1123 it
+defaults disabled in Exim. However, discussion in connection with RFC 821bis
+(aka RFC 2821) has concluded that the response should be 252 in the disabled
+state, because there are broken clients that try VRFY before RCPT. A 5xx
+response should be given only when the address is positively known to be
+undeliverable. Sigh. Also, for ETRN, 458 is given on refusal, and for AUTH,
+503.
+
+From Exim 4.63, it is possible to override the response code details by
+providing a suitable response code string at the start of the message provided
+in user_msg. The code's first digit is checked for validity.
Arguments:
where where the ACL was called from
int
smtp_handle_acl_fail(int where, int rc, uschar *user_msg, uschar *log_msg)
{
-int code = acl_wherecodes[where];
BOOL drop = rc == FAIL_DROP;
+int codelen = 3;
+uschar *smtp_code;
uschar *lognl;
uschar *sender_info = US"";
-uschar *what = (where == ACL_WHERE_PREDATA)? US"DATA" :
+uschar *what =
#ifdef WITH_CONTENT_SCAN
- (where == ACL_WHERE_MIME)? US"during MIME ACL checks" :
-#endif
- (where == ACL_WHERE_DATA)? US"after DATA" :
- string_sprintf("%s %s", acl_wherenames[where], smtp_data);
+ (where == ACL_WHERE_MIME)? US"during MIME ACL checks" :
+#endif
+ (where == ACL_WHERE_PREDATA)? US"DATA" :
+ (where == ACL_WHERE_DATA)? US"after DATA" :
+ (smtp_cmd_argument == NULL)?
+ string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]) :
+ string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_argument);
if (drop) rc = FAIL;
+/* Set the default SMTP code, and allow a user message to change it. */
+
+smtp_code = (rc != FAIL)? US"451" : acl_wherecodes[where];
+smtp_message_code(&smtp_code, &codelen, &user_msg, &log_msg);
+
/* We used to have sender_address here; however, there was a bug that was not
updating sender_address after a rewrite during a verify. When this bug was
fixed, sender_address at this point became the rewritten address. I'm not sure
/* If there's been a sender verification failure with a specific message, and
we have not sent a response about it yet, do so now, as a preliminary line for
-failures, but not defers. However, log it in both cases. */
+failures, but not defers. However, always log it for defer, and log it for fail
+unless the sender_verify_fail log selector has been turned off. */
if (sender_verified_failed != NULL &&
!testflag(sender_verified_failed, af_sverify_told))
{
setflag(sender_verified_failed, af_sverify_told);
- log_write(0, LOG_MAIN|LOG_REJECT, "%s sender verify %s for <%s>%s",
- host_and_ident(TRUE),
- ((sender_verified_failed->special_action & 255) == DEFER)? "defer" : "fail",
- sender_verified_failed->address,
- (sender_verified_failed->message == NULL)? US"" :
- string_sprintf(": %s", sender_verified_failed->message));
+ if (rc != FAIL || (log_extra_selector & LX_sender_verify_fail) != 0)
+ log_write(0, LOG_MAIN|LOG_REJECT, "%s sender verify %s for <%s>%s",
+ host_and_ident(TRUE),
+ ((sender_verified_failed->special_action & 255) == DEFER)? "defer":"fail",
+ sender_verified_failed->address,
+ (sender_verified_failed->message == NULL)? US"" :
+ string_sprintf(": %s", sender_verified_failed->message));
if (rc == FAIL && sender_verified_failed->user_message != NULL)
- smtp_respond(code, FALSE, string_sprintf(
+ smtp_respond(smtp_code, codelen, FALSE, 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"
always a 5xx one - see comments at the start of this function. If the original
rc was FAIL_DROP we drop the connection and yield 2. */
-if (rc == FAIL) smtp_respond(code, TRUE, (user_msg == NULL)?
+if (rc == FAIL) smtp_respond(smtp_code, codelen, TRUE, (user_msg == NULL)?
US"Administrative prohibition" : user_msg);
/* Send temporary failure response to the command. Don't give any details,
sender_verified_failed != NULL &&
sender_verified_failed->message != NULL)
{
- smtp_respond(451, FALSE, sender_verified_failed->message);
+ smtp_respond(smtp_code, codelen, FALSE, sender_verified_failed->message);
}
- smtp_respond(451, TRUE, user_msg);
+ smtp_respond(smtp_code, codelen, TRUE, user_msg);
}
else
- smtp_printf("451 Temporary local problem - please try later\r\n");
+ smtp_respond(smtp_code, codelen, TRUE,
+ US"Temporary local problem - please try later");
}
-/* Log the incident. If the connection is not forcibly to be dropped, return 0.
-Otherwise, log why it is closing if required and return 2. */
+/* Log the incident to the logs that are specified by log_reject_target
+(default main, reject). This can be empty to suppress logging of rejections. If
+the connection is not forcibly to be dropped, return 0. Otherwise, log why it
+is closing if required and return 2. */
-log_write(0, LOG_MAIN|LOG_REJECT, "%s %s%srejected %s%s",
- host_and_ident(TRUE),
- sender_info, (rc == FAIL)? US"" : US"temporarily ", what, log_msg);
+if (log_reject_target != 0)
+ log_write(0, log_reject_target, "%s %s%srejected %s%s",
+ host_and_ident(TRUE),
+ sender_info, (rc == FAIL)? US"" : US"temporarily ", what, log_msg);
if (!drop) return 0;
+/*************************************************
+* Verify HELO argument *
+*************************************************/
+
+/* This function is called if helo_verify_hosts or helo_try_verify_hosts is
+matched. It is also called from ACL processing if verify = helo is used and
+verification was not previously tried (i.e. helo_try_verify_hosts was not
+matched). The result of its processing is to set helo_verified and
+helo_verify_failed. These variables should both be FALSE for this function to
+be called.
+
+Note that EHLO/HELO is legitimately allowed to quote an address literal. Allow
+for IPv6 ::ffff: literals.
+
+Argument: none
+Returns: TRUE if testing was completed;
+ FALSE on a temporary failure
+*/
+
+BOOL
+smtp_verify_helo(void)
+{
+BOOL yield = TRUE;
+
+HDEBUG(D_receive) debug_printf("verifying EHLO/HELO argument \"%s\"\n",
+ sender_helo_name);
+
+if (sender_helo_name == NULL)
+ {
+ HDEBUG(D_receive) debug_printf("no EHLO/HELO command was issued\n");
+ }
+
+/* Deal with the case of -bs without an IP address */
+
+else if (sender_host_address == NULL)
+ {
+ HDEBUG(D_receive) debug_printf("no client IP address: assume success\n");
+ 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,
+ Ustrlen(sender_host_address)) == 0;
+
+ #if HAVE_IPV6
+ if (!helo_verified)
+ {
+ if (strncmpic(sender_host_address, US"::ffff:", 7) == 0)
+ helo_verified = Ustrncmp(sender_helo_name + 1,
+ sender_host_address + 7, Ustrlen(sender_host_address) - 7) == 0;
+ }
+ #endif
+
+ HDEBUG(D_receive)
+ { if (helo_verified) debug_printf("matched host address\n"); }
+ }
+
+/* Do a reverse lookup if one hasn't already given a positive or negative
+response. If that fails, or the name doesn't match, try checking with a forward
+lookup. */
+
+else
+ {
+ if (sender_host_name == NULL && !host_lookup_failed)
+ yield = host_name_lookup() != DEFER;
+
+ /* If a host name is known, check it and all its aliases. */
+
+ if (sender_host_name != NULL)
+ {
+ helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0;
+
+ if (helo_verified)
+ {
+ HDEBUG(D_receive) debug_printf("matched host name\n");
+ }
+ else
+ {
+ uschar **aliases = sender_host_aliases;
+ while (*aliases != NULL)
+ {
+ helo_verified = strcmpic(*aliases++, sender_helo_name) == 0;
+ if (helo_verified) break;
+ }
+ HDEBUG(D_receive)
+ {
+ if (helo_verified)
+ debug_printf("matched alias %s\n", *(--aliases));
+ }
+ }
+ }
+
+ /* Final attempt: try a forward lookup of the helo name */
+
+ if (!helo_verified)
+ {
+ int rc;
+ host_item h;
+ h.name = sender_helo_name;
+ h.address = NULL;
+ h.mx = MX_NONE;
+ h.next = NULL;
+ HDEBUG(D_receive) debug_printf("getting IP address for %s\n",
+ sender_helo_name);
+ rc = host_find_byname(&h, NULL, 0, NULL, TRUE);
+ if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
+ {
+ host_item *hh = &h;
+ while (hh != NULL)
+ {
+ if (Ustrcmp(hh->address, sender_host_address) == 0)
+ {
+ helo_verified = TRUE;
+ HDEBUG(D_receive)
+ debug_printf("IP address for %s matches calling address\n",
+ sender_helo_name);
+ break;
+ }
+ hh = hh->next;
+ }
+ }
+ }
+ }
+
+if (!helo_verified) helo_verify_failed = TRUE; /* We've tried ... */
+return yield;
+}
+
+
+
+
+/*************************************************
+* Send user response message *
+*************************************************/
+
+/* This function is passed a default response code and a user message. It calls
+smtp_message_code() to check and possibly modify the response code, and then
+calls smtp_respond() to transmit the response. I put this into a function
+just to avoid a lot of repetition.
+
+Arguments:
+ code the response code
+ user_msg the user message
+
+Returns: nothing
+*/
+
+static void
+smtp_user_msg(uschar *code, uschar *user_msg)
+{
+int len = 3;
+smtp_message_code(&code, &len, &user_msg, NULL);
+smtp_respond(code, len, TRUE, user_msg);
+}
+
+
+
+
/*************************************************
* Initialize for SMTP incoming message *
*************************************************/
uschar *etrn_command;
uschar *etrn_serialize_key;
uschar *errmess;
- uschar *user_msg, *log_msg;
+ uschar *log_msg, *smtp_code;
+ uschar *user_msg = NULL;
uschar *recipient = NULL;
uschar *hello = NULL;
uschar *set_id = NULL;
pid_t pid;
int start, end, sender_domain, recipient_domain;
int ptr, size, rc;
- int c;
+ int c, i;
auth_instance *au;
switch(smtp_read_command(TRUE))
{
/* The AUTH command is not permitted to occur inside a transaction, and may
- occur successfully only once per connection, and then only when we've
- advertised it. Actually, that isn't quite true. When TLS is started, all
- previous information about a connection must be discarded, so a new AUTH is
- permitted at that time.
+ occur successfully only once per connection. Actually, that isn't quite
+ true. When TLS is started, all previous information about a connection must
+ be discarded, so a new AUTH is permitted at that time.
+
+ AUTH may only be used when it has been advertised. However, it seems that
+ there are clients that send AUTH when it hasn't been advertised, some of
+ them even doing this after HELO. And there are MTAs that accept this. Sigh.
+ So there's a get-out that allows this to happen.
AUTH is initially labelled as a "nonmail command" so that one occurrence
doesn't get counted. We change the label here so that multiple failing
authentication_failed = TRUE;
cmd_list[CMD_LIST_AUTH].is_mail_cmd = FALSE;
- if (!auth_advertised)
+ if (!auth_advertised && !allow_auth_unadvertised)
{
done = synprot_error(L_smtp_protocol_error, 503, NULL,
US"AUTH command used when not advertised");
if (acl_smtp_auth != NULL)
{
- rc = acl_check(ACL_WHERE_AUTH, smtp_data, acl_smtp_auth, &user_msg,
- &log_msg);
+ rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth, &user_msg, &log_msg);
if (rc != OK)
{
done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg);
/* Find the name of the requested authentication mechanism. */
- s = smtp_data;
- while ((c = *smtp_data) != 0 && !isspace(c))
+ s = smtp_cmd_argument;
+ while ((c = *smtp_cmd_argument) != 0 && !isspace(c))
{
if (!isalnum(c) && c != '-' && c != '_')
{
US"invalid character in authentication mechanism name");
goto COMMAND_LOOP;
}
- smtp_data++;
+ smtp_cmd_argument++;
}
/* 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_data != 0)
+ if (*smtp_cmd_argument != 0)
{
- *smtp_data++ = 0;
- while (isspace(*smtp_data)) smtp_data++;
+ *smtp_cmd_argument++ = 0;
+ while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++;
}
/* Search for an authentication mechanism which is configured for use
- as a server and which has been advertised. */
+ as a server and which has been advertised (unless, sigh, allow_auth_
+ unadvertised is set). */
for (au = auths; au != NULL; au = au->next)
{
if (strcmpic(s, au->public_name) == 0 && au->server &&
- au->advertised) break;
+ (au->advertised || allow_auth_unadvertised)) break;
}
if (au == NULL)
break;
}
- /* Run the checking code, passing the remainder of the command
- line as data. Initialize $0 empty. The authenticator may set up
- other numeric variables. Afterwards, have a go at expanding the set_id
- string, even if authentication failed - for bad passwords it can be useful
- to log the userid. On success, require set_id to expand and exist, and
- put it in authenticated_id. Save this in permanent store, as the working
- store gets reset at HELO, RSET, etc. */
+ /* 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
+ it as the only set numerical variable. The authenticator may set $auth<n>
+ and also set other numeric variables. The $auth<n> variables are preferred
+ nowadays; the numerical variables remain for backwards compatibility.
+ Afterwards, have a go at expanding the set_id string, even if
+ authentication failed - for bad passwords it can be useful to log the
+ userid. On success, require set_id to expand and exist, and put it in
+ 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;
expand_nmax = 0;
expand_nlength[0] = 0; /* $0 contains nothing */
- c = (au->info->servercode)(au, smtp_data);
+ c = (au->info->servercode)(au, smtp_cmd_argument);
if (au->set_id != NULL) 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> */
+
+ /* 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
+ normal use, it never will, but when playing around or testing, this error
+ can (did) happen. To guard against this, ensure that the id contains only
+ printing characters. */
+
+ if (set_id != NULL) set_id = string_printing(set_id);
/* For the non-OK cases, set up additional logging data if set_id
is not empty. */
/* 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_data))
+ if (!check_helo(smtp_cmd_argument))
{
smtp_printf("501 Syntactically invalid %s argument(s)\r\n", hello);
log_write(0, LOG_MAIN|LOG_REJECT, "rejected %s from %s: syntactically "
"invalid argument(s): %s", hello, host_and_ident(FALSE),
- (*smtp_data == 0)? US"(no argument given)" :
- string_printing(smtp_data));
+ (*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), cmd_buffer);
+ host_and_ident(FALSE), smtp_cmd_buffer);
done = 1;
}
if (!sender_host_unknown)
{
BOOL old_helo_verified = helo_verified;
- uschar *p = smtp_data;
+ uschar *p = smtp_cmd_argument;
while (*p != 0 && !isspace(*p)) { *p = tolower(*p); p++; }
*p = 0;
(tls_active >= 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. Note that HELO is legitimately
- allowed to quote an address literal. Allow for IPv6 ::ffff: literals. */
+ 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. */
- helo_verified = FALSE;
+ helo_verified = helo_verify_failed = FALSE;
if (helo_required || helo_verify)
{
- BOOL tempfail = FALSE;
-
- HDEBUG(D_receive) debug_printf("verifying %s %s\n", hello,
- sender_helo_name);
- if (sender_helo_name[0] == '[')
- {
- helo_verified = Ustrncmp(sender_helo_name+1, sender_host_address,
- Ustrlen(sender_host_address)) == 0;
-
- #if HAVE_IPV6
- if (!helo_verified)
- {
- if (strncmpic(sender_host_address, US"::ffff:", 7) == 0)
- helo_verified = Ustrncmp(sender_helo_name + 1,
- sender_host_address + 7, Ustrlen(sender_host_address) - 7) == 0;
- }
- #endif
-
- HDEBUG(D_receive)
- { if (helo_verified) debug_printf("matched host address\n"); }
- }
-
- /* Do a reverse lookup if one hasn't already given a positive or
- negative response. If that fails, or the name doesn't match, try
- checking with a forward lookup. */
-
- else
- {
- if (sender_host_name == NULL && !host_lookup_failed)
- tempfail = host_name_lookup() == DEFER;
-
- /* If a host name is known, check it and all its aliases. */
-
- if (sender_host_name != NULL)
- {
- helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0;
-
- if (helo_verified)
- {
- HDEBUG(D_receive) debug_printf("matched host name\n");
- }
- else
- {
- uschar **aliases = sender_host_aliases;
- while (*aliases != NULL)
- {
- helo_verified = strcmpic(*aliases++, sender_helo_name) == 0;
- if (helo_verified) break;
- }
- HDEBUG(D_receive)
- {
- if (helo_verified)
- debug_printf("matched alias %s\n", *(--aliases));
- }
- }
- }
-
- /* Final attempt: try a forward lookup of the helo name */
-
- if (!helo_verified)
- {
- int rc;
- host_item h;
- h.name = sender_helo_name;
- h.address = NULL;
- h.mx = MX_NONE;
- h.next = NULL;
- HDEBUG(D_receive) debug_printf("getting IP address for %s\n",
- sender_helo_name);
- rc = host_find_byname(&h, NULL, NULL, TRUE);
- if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
- {
- host_item *hh = &h;
- while (hh != NULL)
- {
- if (Ustrcmp(hh->address, sender_host_address) == 0)
- {
- helo_verified = TRUE;
- HDEBUG(D_receive)
- debug_printf("IP address for %s matches calling address\n",
- sender_helo_name);
- break;
- }
- hh = hh->next;
- }
- }
- }
- }
-
- /* Verification failed. A temporary lookup failure gives a temporary
- error. */
-
+ BOOL tempfail = !smtp_verify_helo();
if (!helo_verified)
{
if (helo_required)
if (acl_smtp_helo != NULL)
{
- rc = acl_check(ACL_WHERE_HELO, smtp_data, acl_smtp_helo, &user_msg,
- &log_msg);
+ rc = acl_check(ACL_WHERE_HELO, NULL, acl_smtp_helo, &user_msg, &log_msg);
if (rc != OK)
{
done = smtp_handle_acl_fail(ACL_WHERE_HELO, rc, user_msg, log_msg);
}
}
- /* The EHLO/HELO command is acceptable. Reset the protocol and the state,
- abandoning any previous message. */
-
- received_protocol = (esmtp?
- protocols[pextend +
- ((sender_host_authenticated != NULL)? pauthed : 0) +
- ((tls_active >= 0)? pcrpted : 0)]
- :
- protocols[pnormal + ((tls_active >= 0)? pcrpted : 0)])
- +
- ((sender_host_address != NULL)? pnlocal : 0);
-
- smtp_reset(reset_point);
- toomany = FALSE;
-
- /* Generate an OK reply, including 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 it is sent in one write(). */
+ /* 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;
tls_advertised = FALSE;
#endif
- s = string_sprintf("250 %s Hello %s%s%s",
- smtp_active_hostname,
- (sender_ident == NULL)? US"" : sender_ident,
- (sender_ident == NULL)? US"" : US" at ",
- (sender_host_name == NULL)? sender_helo_name : sender_host_name);
+ smtp_code = US"250 "; /* Default response code plus space*/
+ if (user_msg == NULL)
+ {
+ s = string_sprintf("%.3s %s Hello %s%s%s",
+ smtp_code,
+ smtp_active_hostname,
+ (sender_ident == NULL)? US"" : sender_ident,
+ (sender_ident == NULL)? US"" : US" at ",
+ (sender_host_name == NULL)? sender_helo_name : sender_host_name);
- ptr = Ustrlen(s);
- size = ptr + 1;
+ ptr = Ustrlen(s);
+ size = ptr + 1;
- if (sender_host_address != NULL)
+ if (sender_host_address != NULL)
+ {
+ s = string_cat(s, &size, &ptr, US" [", 2);
+ s = string_cat(s, &size, &ptr, sender_host_address,
+ Ustrlen(sender_host_address));
+ s = string_cat(s, &size, &ptr, US"]", 1);
+ }
+ }
+
+ /* 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. */
+
+ else
{
- s = string_cat(s, &size, &ptr, US" [", 2);
- s = string_cat(s, &size, &ptr, sender_host_address,
- Ustrlen(sender_host_address));
- s = string_cat(s, &size, &ptr, US"]", 1);
+ char *ss;
+ int codelen = 4;
+ smtp_message_code(&smtp_code, &codelen, &user_msg, NULL);
+ 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;
+ }
+ ptr = Ustrlen(s);
+ size = ptr + 1;
}
s = string_cat(s, &size, &ptr, US"\r\n", 2);
if (thismessage_size_limit > 0)
{
- sprintf(CS big_buffer, "250-SIZE %d\r\n", thismessage_size_limit);
+ sprintf(CS big_buffer, "%.3s-SIZE %d\r\n", smtp_code,
+ thismessage_size_limit);
s = string_cat(s, &size, &ptr, big_buffer, Ustrlen(big_buffer));
}
else
{
- s = string_cat(s, &size, &ptr, US"250-SIZE\r\n", 10);
+ s = string_cat(s, &size, &ptr, smtp_code, 3);
+ s = string_cat(s, &size, &ptr, US"-SIZE\r\n", 7);
}
/* Exim does not do protocol conversion or data conversion. It is 8-bit
provided as an option. */
if (accept_8bitmime)
- s = string_cat(s, &size, &ptr, US"250-8BITMIME\r\n", 14);
+ {
+ s = string_cat(s, &size, &ptr, smtp_code, 3);
+ s = string_cat(s, &size, &ptr, US"-8BITMIME\r\n", 11);
+ }
/* Advertise ETRN if there's an ACL checking whether a host is
permitted to issue it; a check is made when any host actually tries. */
if (acl_smtp_etrn != NULL)
{
- s = string_cat(s, &size, &ptr, US"250-ETRN\r\n", 10);
+ s = string_cat(s, &size, &ptr, smtp_code, 3);
+ s = string_cat(s, &size, &ptr, US"-ETRN\r\n", 7);
}
/* Advertise EXPN if there's an ACL checking whether a host is
if (acl_smtp_expn != NULL)
{
- s = string_cat(s, &size, &ptr, US"250-EXPN\r\n", 10);
+ s = string_cat(s, &size, &ptr, smtp_code, 3);
+ s = string_cat(s, &size, &ptr, US"-EXPN\r\n", 7);
}
/* Exim is quite happy with pipelining, so let the other end know that
if (verify_check_host(&pipelining_advertise_hosts) == OK)
{
- s = string_cat(s, &size, &ptr, US"250-PIPELINING\r\n", 16);
+ s = string_cat(s, &size, &ptr, smtp_code, 3);
+ s = string_cat(s, &size, &ptr, US"-PIPELINING\r\n", 13);
sync_cmd_limit = NON_SYNC_CMD_PIPELINING;
pipelining_advertised = TRUE;
}
int saveptr;
if (first)
{
- s = string_cat(s, &size, &ptr, US"250-AUTH", 8);
+ s = string_cat(s, &size, &ptr, smtp_code, 3);
+ s = string_cat(s, &size, &ptr, US"-AUTH", 5);
first = FALSE;
auth_advertised = TRUE;
}
if (tls_active < 0 &&
verify_check_host(&tls_advertise_hosts) != FAIL)
{
- s = string_cat(s, &size, &ptr, US"250-STARTTLS\r\n", 14);
+ s = string_cat(s, &size, &ptr, smtp_code, 3);
+ s = string_cat(s, &size, &ptr, US"-STARTTLS\r\n", 11);
tls_advertised = TRUE;
}
#endif
/* Finish off the multiline reply with one that is always available. */
- s = string_cat(s, &size, &ptr, US"250 HELP\r\n", 10);
+ s = string_cat(s, &size, &ptr, smtp_code, 3);
+ s = string_cat(s, &size, &ptr, US" HELP\r\n", 7);
}
/* Terminate the string (for debug), write it, and note that HELO/EHLO
if (tls_active >= 0) (void)tls_write(s, ptr); else
#endif
- fwrite(s, 1, ptr, smtp_out);
- DEBUG(D_receive) debug_printf("SMTP>> %s", s);
+ (void)fwrite(s, 1, ptr, smtp_out);
+ DEBUG(D_receive)
+ {
+ uschar *cr;
+ while ((cr = Ustrchr(s, '\r')) != NULL) /* lose CRs */
+ memmove(cr, cr + 1, (ptr--) - (cr - s));
+ debug_printf("SMTP>> %s", s);
+ }
helo_seen = TRUE;
+
+ /* Reset the protocol and the state, abandoning any previous message. */
+
+ received_protocol = (esmtp?
+ protocols[pextend +
+ ((sender_host_authenticated != NULL)? pauthed : 0) +
+ ((tls_active >= 0)? pcrpted : 0)]
+ :
+ protocols[pnormal + ((tls_active >= 0)? pcrpted : 0)])
+ +
+ ((sender_host_address != NULL)? pnlocal : 0);
+
+ smtp_reset(reset_point);
+ toomany = FALSE;
break; /* HELO/EHLO */
break;
}
- if (smtp_data[0] == 0)
+ if (smtp_cmd_argument[0] == 0)
{
done = synprot_error(L_smtp_protocol_error, 501, NULL,
US"MAIL must have an address operand");
TRUE flag allows "<>" as a sender address. */
raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)?
- rewrite_one(smtp_data, rewrite_smtp, NULL, FALSE, US"",
- global_rewrite_rules) : smtp_data;
+ rewrite_one(smtp_cmd_argument, rewrite_smtp, NULL, FALSE, US"",
+ global_rewrite_rules) : smtp_cmd_argument;
/* rfc821_domains = TRUE; << no longer needed */
raw_sender =
if (raw_sender == NULL)
{
- done = synprot_error(L_smtp_syntax_error, 501, smtp_data, errmess);
+ done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_argument, errmess);
break;
}
else
{
smtp_printf("501 %s: sender address must contain a domain\r\n",
- smtp_data);
+ smtp_cmd_argument);
log_write(L_smtp_syntax_error,
LOG_MAIN|LOG_REJECT,
"unqualified sender rejected: <%s> %s%s",
if (rc == OK || rc == DISCARD)
{
- smtp_printf("250 OK\r\n");
+ if (user_msg == NULL) smtp_printf("250 OK\r\n");
+ else 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);
/* Check for an operand */
- if (smtp_data[0] == 0)
+ if (smtp_cmd_argument[0] == 0)
{
done = synprot_error(L_smtp_syntax_error, 501, NULL,
US"RCPT must have an address operand");
as a recipient address */
recipient = ((rewrite_existflags & rewrite_smtp) != 0)?
- rewrite_one(smtp_data, rewrite_smtp, NULL, FALSE, US"",
- global_rewrite_rules) : smtp_data;
+ rewrite_one(smtp_cmd_argument, rewrite_smtp, NULL, FALSE, US"",
+ global_rewrite_rules) : smtp_cmd_argument;
/* rfc821_domains = TRUE; << no longer needed */
recipient = parse_extract_address(recipient, &errmess, &start, &end,
if (recipient == NULL)
{
- done = synprot_error(L_smtp_syntax_error, 501, smtp_data, errmess);
+ done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_argument, errmess);
rcpt_fail_count++;
break;
}
{
rcpt_fail_count++;
smtp_printf("501 %s: recipient address must contain a domain\r\n",
- smtp_data);
+ smtp_cmd_argument);
log_write(L_smtp_syntax_error,
LOG_MAIN|LOG_REJECT, "unqualified recipient rejected: "
"<%s> %s%s", recipient, host_and_ident(TRUE),
if (rc == OK)
{
- smtp_printf("250 Accepted\r\n");
+ if (user_msg == NULL) smtp_printf("250 Accepted\r\n");
+ else smtp_user_msg(US"250", user_msg);
receive_add_recipient(recipient, -1);
}
else if (rc == DISCARD)
{
- smtp_printf("250 Accepted\r\n");
+ if (user_msg == NULL) smtp_printf("250 Accepted\r\n");
+ else smtp_user_msg(US"250", user_msg);
rcpt_fail_count++;
discarded = TRUE;
log_write(0, LOG_MAIN|LOG_REJECT, "%s F=<%s> rejected RCPT %s: "
"discarded by %s ACL%s%s", host_and_ident(TRUE),
(sender_address_unrewritten != NULL)?
sender_address_unrewritten : sender_address,
- smtp_data, recipients_discarded? "MAIL" : "RCPT",
+ smtp_cmd_argument, recipients_discarded? "MAIL" : "RCPT",
(log_msg == NULL)? US"" : US": ",
(log_msg == NULL)? US"" : log_msg);
}
smtp_printf("554 Too many recipients\r\n");
break;
}
-
+
if (acl_smtp_predata == NULL) rc = OK; else
- {
+ {
enable_dollar_recipients = TRUE;
- rc = acl_check(ACL_WHERE_PREDATA, NULL, acl_smtp_predata, &user_msg,
+ rc = acl_check(ACL_WHERE_PREDATA, NULL, acl_smtp_predata, &user_msg,
&log_msg);
enable_dollar_recipients = FALSE;
}
if (rc == OK)
{
- smtp_printf("354 Enter message, ending with \".\" on a line by itself\r\n");
+ if (user_msg == NULL)
+ smtp_printf("354 Enter message, ending with \".\" on a line by itself\r\n");
+ else smtp_user_msg(US"354", user_msg);
done = 3;
message_ended = END_NOTENDED; /* Indicate in middle of data */
}
case VRFY_CMD:
- rc = acl_check(ACL_WHERE_VRFY, smtp_data, acl_smtp_vrfy, &user_msg,
- &log_msg);
+ rc = acl_check(ACL_WHERE_VRFY, NULL, acl_smtp_vrfy, &user_msg, &log_msg);
if (rc != OK)
done = smtp_handle_acl_fail(ACL_WHERE_VRFY, rc, user_msg, log_msg);
else
uschar *s = NULL;
/* rfc821_domains = TRUE; << no longer needed */
- address = parse_extract_address(smtp_data, &errmess, &start, &end,
+ address = parse_extract_address(smtp_cmd_argument, &errmess, &start, &end,
&recipient_domain, FALSE);
/* rfc821_domains = FALSE; << no longer needed */
break;
case DEFER:
- s = (addr->message != NULL)?
- string_sprintf("451 <%s> %s", address, addr->message) :
+ s = (addr->user_message != NULL)?
+ string_sprintf("451 <%s> %s", address, addr->user_message) :
string_sprintf("451 Cannot resolve <%s> at this time", address);
break;
case FAIL:
- s = (addr->message != NULL)?
- string_sprintf("550 <%s> %s", address, addr->message) :
+ s = (addr->user_message != NULL)?
+ string_sprintf("550 <%s> %s", address, addr->user_message) :
string_sprintf("550 <%s> is not deliverable", address);
log_write(0, LOG_MAIN, "VRFY failed for %s %s",
- smtp_data, host_and_ident(TRUE));
+ smtp_cmd_argument, host_and_ident(TRUE));
break;
}
}
case EXPN_CMD:
- rc = acl_check(ACL_WHERE_EXPN, smtp_data, acl_smtp_expn, &user_msg,
- &log_msg);
+ 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_data, FALSE), smtp_out,
- vopt_is_recipient | vopt_qualify | vopt_expn, -1, -1, -1, NULL, NULL,
- NULL);
+ (void) verify_address(deliver_make_addr(smtp_cmd_argument, 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 */
}
if (acl_smtp_quit != NULL)
{
- rc = acl_check(ACL_WHERE_QUIT, US"", acl_smtp_quit,&user_msg,&log_msg);
+ rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit,&user_msg,&log_msg);
if (rc == ERROR)
log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
log_msg);
}
- else user_msg = NULL;
if (user_msg == NULL)
smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
else
- smtp_printf("221 %s\r\n", user_msg);
+ smtp_respond(US"221", 3, TRUE, user_msg);
#ifdef SUPPORT_TLS
tls_close(TRUE);
break;
}
- log_write(L_etrn, LOG_MAIN, "ETRN %s received from %s", smtp_data,
+ log_write(L_etrn, LOG_MAIN, "ETRN %s received from %s", smtp_cmd_argument,
host_and_ident(FALSE));
- rc = acl_check(ACL_WHERE_ETRN, smtp_data, acl_smtp_etrn, &user_msg,
- &log_msg);
+ rc = acl_check(ACL_WHERE_ETRN, NULL, acl_smtp_etrn, &user_msg, &log_msg);
if (rc != OK)
{
done = smtp_handle_acl_fail(ACL_WHERE_ETRN, rc, user_msg, log_msg);
/* Compute the serialization key for this command. */
- etrn_serialize_key = string_sprintf("etrn-%s\n", smtp_data);
+ etrn_serialize_key = string_sprintf("etrn-%s\n", smtp_cmd_argument);
/* 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,
uschar *error;
BOOL rc;
etrn_command = smtp_etrn_command;
- deliver_domain = smtp_data;
+ deliver_domain = smtp_cmd_argument;
rc = transport_set_up_command(&argv, smtp_etrn_command, TRUE, 0, NULL,
US"ETRN processing", &error);
deliver_domain = NULL;
else
{
- if (*smtp_data++ != '#')
+ if (*smtp_cmd_argument++ != '#')
{
done = synprot_error(L_smtp_syntax_error, 501, NULL,
US"argument must begin with #");
}
etrn_command = US"exim -R";
argv = child_exec_exim(CEE_RETURN_ARGV, TRUE, NULL, TRUE, 2, US"-R",
- smtp_data);
+ smtp_cmd_argument);
}
/* If we are host-testing, don't actually do anything. */
debug_printf("ETRN command is: %s\n", etrn_command);
debug_printf("ETRN command execution skipped\n");
}
- smtp_printf("250 OK\r\n");
+ if (user_msg == NULL) smtp_printf("250 OK\r\n");
+ else smtp_user_msg(US"250", user_msg);
break;
}
if (smtp_etrn_serialize && !enq_start(etrn_serialize_key))
{
- smtp_printf("458 Already processing %s\r\n", smtp_data);
+ smtp_printf("458 Already processing %s\r\n", smtp_cmd_argument);
break;
}
if ((pid = fork()) == 0)
{
- smtp_input = FALSE; /* This process is not associated with the */
- fclose(smtp_in); /* SMTP call any more. */
- fclose(smtp_out);
+ 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 */
smtp_printf("458 Unable to fork process\r\n");
if (smtp_etrn_serialize) enq_end(etrn_serialize_key);
}
- else smtp_printf("250 OK\r\n");
+ else
+ {
+ if (user_msg == NULL) smtp_printf("250 OK\r\n");
+ else smtp_user_msg(US"250", user_msg);
+ }
signal(SIGCHLD, oldsignal);
break;
if (c > 150) c = 150;
smtp_inptr[c] = 0;
incomplete_transaction_log(US"sync failure");
- log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol violation: "
- "synchronization error "
+ 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",
- cmd_buffer, host_and_ident(TRUE),
+ smtp_cmd_buffer, host_and_ident(TRUE),
string_printing(smtp_inptr));
smtp_printf("554 SMTP synchronization error\r\n");
done = 1; /* Pretend eof - drops connection */
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),
- smtp_data - cmd_buffer, cmd_buffer);
+ smtp_cmd_argument - smtp_cmd_buffer, smtp_cmd_buffer);
smtp_printf("554 Too many nonmail commands\r\n");
done = 1; /* Pretend eof - drops connection */
break;
{
log_write(L_smtp_syntax_error, LOG_MAIN,
"SMTP syntax error in \"%s\" %s %s",
- string_printing(cmd_buffer), host_and_ident(TRUE),
+ string_printing(smtp_cmd_buffer), host_and_ident(TRUE),
US"unrecognized command");
incomplete_transaction_log(US"unrecognized command");
smtp_printf("500 Too many unrecognized commands\r\n");
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),
- cmd_buffer);
+ smtp_cmd_buffer);
}
else
done = synprot_error(L_smtp_syntax_error, 500, NULL,
git://git.exim.org / exim.git / blobdiff