-/* $Cambridge: exim/src/src/transports/smtp.c,v 1.39 2008/03/05 21:13:23 tom Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2007 */
+/* Copyright (c) University of Cambridge 1995 - 2012 */
/* See the file NOTICE for conditions of use and distribution. */
#include "../exim.h"
(void *)offsetof(transport_instance, connection_max_messages) },
{ "data_timeout", opt_time,
(void *)offsetof(smtp_transport_options_block, data_timeout) },
+#ifdef EXPERIMENTAL_DBL
+ { "dbl_host_defer_query", opt_stringptr,
+ (void *)offsetof(smtp_transport_options_block, dbl_host_defer_query) },
+#endif
{ "delay_after_cutoff", opt_bool,
(void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
- #if (defined EXPERIMENTAL_DOMAINKEYS) || (defined EXPERIMENTAL_DKIM)
- { "dk_canon", opt_stringptr,
- (void *)offsetof(smtp_transport_options_block, dk_canon) },
- { "dk_domain", opt_stringptr,
- (void *)offsetof(smtp_transport_options_block, dk_domain) },
- { "dk_headers", opt_stringptr,
- (void *)offsetof(smtp_transport_options_block, dk_headers) },
- { "dk_private_key", opt_stringptr,
- (void *)offsetof(smtp_transport_options_block, dk_private_key) },
- { "dk_selector", opt_stringptr,
- (void *)offsetof(smtp_transport_options_block, dk_selector) },
- { "dk_strict", opt_stringptr,
- (void *)offsetof(smtp_transport_options_block, dk_strict) },
+#ifndef DISABLE_DKIM
{ "dkim_canon", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, dkim_canon) },
{ "dkim_domain", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
{ "dkim_strict", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, dkim_strict) },
- #endif
+#endif
{ "dns_qualify_single", opt_bool,
(void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
{ "dns_search_parents", opt_bool,
(void *)offsetof(smtp_transport_options_block, dns_search_parents) },
+ { "dscp", opt_stringptr,
+ (void *)offsetof(smtp_transport_options_block, dscp) },
{ "fallback_hosts", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, fallback_hosts) },
{ "final_timeout", opt_time,
(void *)offsetof(smtp_transport_options_block, final_timeout) },
{ "gethostbyname", opt_bool,
(void *)offsetof(smtp_transport_options_block, gethostbyname) },
- #ifdef SUPPORT_TLS
+#ifdef SUPPORT_TLS
+ /* These are no longer honoured, as of Exim 4.80; for now, we silently
+ ignore; a later release will warn, and a later-still release will remove
+ these options, so that using them becomes an error. */
{ "gnutls_require_kx", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
{ "gnutls_require_mac", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
{ "gnutls_require_protocols", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
- #endif
+#endif
{ "helo_data", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, helo_data) },
{ "hosts", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
{ "hosts_avoid_pipelining", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
- #ifdef SUPPORT_TLS
+#ifdef SUPPORT_TLS
{ "hosts_avoid_tls", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
- #endif
+#endif
{ "hosts_max_try", opt_int,
(void *)offsetof(smtp_transport_options_block, hosts_max_try) },
{ "hosts_max_try_hardlimit", opt_int,
(void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
- #ifdef SUPPORT_TLS
+#ifdef SUPPORT_TLS
{ "hosts_nopass_tls", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
- #endif
+#endif
{ "hosts_override", opt_bool,
(void *)offsetof(smtp_transport_options_block, hosts_override) },
{ "hosts_randomize", opt_bool,
(void *)offsetof(smtp_transport_options_block, hosts_randomize) },
{ "hosts_require_auth", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
- #ifdef SUPPORT_TLS
+#ifdef SUPPORT_TLS
+# if defined EXPERIMENTAL_OCSP
+ { "hosts_require_ocsp", opt_stringptr,
+ (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
+# endif
{ "hosts_require_tls", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
- #endif
+#endif
{ "hosts_try_auth", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
+#ifdef EXPERIMENTAL_PRDR
+ { "hosts_try_prdr", opt_stringptr,
+ (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
+#endif
+#ifdef SUPPORT_TLS
+ { "hosts_verify_avoid_tls", opt_stringptr,
+ (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
+#endif
{ "interface", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, interface) },
{ "keepalive", opt_bool,
(void *)offsetof(smtp_transport_options_block, serialize_hosts) },
{ "size_addition", opt_int,
(void *)offsetof(smtp_transport_options_block, size_addition) }
- #ifdef SUPPORT_TLS
+#ifdef SUPPORT_TLS
,{ "tls_certificate", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, tls_certificate) },
{ "tls_crl", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, tls_crl) },
+ { "tls_dh_min_bits", opt_int,
+ (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
{ "tls_privatekey", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, tls_privatekey) },
- { "tls_require_ciphers", opt_stringptr,
+ { "tls_require_ciphers", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
+ { "tls_sni", opt_stringptr,
+ (void *)offsetof(smtp_transport_options_block, tls_sni) },
{ "tls_tempfail_tryclear", opt_bool,
(void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
{ "tls_verify_certificates", opt_stringptr,
(void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }
- #endif
+#endif
};
/* Size of the options list. An extern variable has to be used so that its
NULL, /* interface */
NULL, /* port */
US"smtp", /* protocol */
+ NULL, /* DSCP */
NULL, /* serialize_hosts */
NULL, /* hosts_try_auth */
NULL, /* hosts_require_auth */
+#ifdef EXPERIMENTAL_PRDR
+ NULL, /* hosts_try_prdr */
+#endif
+#ifdef EXPERIMENTAL_OCSP
+ NULL, /* hosts_require_ocsp */
+#endif
NULL, /* hosts_require_tls */
NULL, /* hosts_avoid_tls */
+ US"*", /* hosts_verify_avoid_tls */
NULL, /* hosts_avoid_pipelining */
NULL, /* hosts_avoid_esmtp */
NULL, /* hosts_nopass_tls */
TRUE, /* keepalive */
FALSE, /* lmtp_ignore_quota */
TRUE /* retry_include_ip_address */
- #ifdef SUPPORT_TLS
+#ifdef SUPPORT_TLS
,NULL, /* tls_certificate */
NULL, /* tls_crl */
NULL, /* tls_privatekey */
NULL, /* gnutls_require_kx */
NULL, /* gnutls_require_mac */
NULL, /* gnutls_require_proto */
+ NULL, /* tls_sni */
NULL, /* tls_verify_certificates */
+ EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
+ /* tls_dh_min_bits */
TRUE /* tls_tempfail_tryclear */
- #endif
- #if (defined EXPERIMENTAL_DOMAINKEYS) || (defined EXPERIMENTAL_DKIM)
- ,NULL, /* dk_canon */
- NULL, /* dk_domain */
- NULL, /* dk_headers */
- NULL, /* dk_private_key */
- NULL, /* dk_selector */
- NULL /* dk_strict */
+#endif
+#ifndef DISABLE_DKIM
,NULL, /* dkim_canon */
NULL, /* dkim_domain */
NULL, /* dkim_private_key */
NULL, /* dkim_selector */
NULL, /* dkim_sign_headers */
NULL /* dkim_strict */
- #endif
+#endif
+#ifdef EXPERIMENTAL_DBL
+ ,NULL /* dbl_host_defer_query */
+#endif
};
/* Set the default port according to the protocol */
if (ob->port == NULL)
- ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" : US"smtp";
+ ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
+ (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
/* Set up the setup entry point, to be called before subprocesses for this
transport. */
+#ifdef EXPERIMENTAL_DBL
+/*************************************************
+* Write error message to database log *
+*************************************************/
+
+/* This expands an arbitrary per-transport string.
+ It might, for example, be used to write to the database log.
+
+Arguments:
+ dbl_host_defer_query dbl_host_defer_query from the transport options block
+ addr the address item containing error information
+ host the current host
+
+Returns: nothing
+*/
+
+static void
+dbl_write_defer_log(uschar *dbl_host_defer_query, address_item *addr, host_item *host)
+{
+if (dbl_host_defer_query == NULL)
+ return;
+
+dbl_delivery_ip = string_copy(host->address);
+dbl_delivery_port = (host->port == PORT_NONE)? 25 : host->port;
+dbl_delivery_fqdn = string_copy(host->name);
+dbl_delivery_local_part = string_copy(addr->local_part);
+dbl_delivery_domain = string_copy(addr->domain);
+dbl_defer_errno = addr->basic_errno;
+
+dbl_defer_errstr = (addr->message != NULL)
+ ? (addr->basic_errno > 0)
+ ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
+ : string_copy(addr->message)
+ : (addr->basic_errno > 0)
+ ? string_copy(strerror(addr->basic_errno))
+ : NULL;
+
+DEBUG(D_transport) {
+ debug_printf(" DBL(host defer): dbl_host_defer_query=|%s| dbl_delivery_IP=%s\n", dbl_host_defer_query, dbl_delivery_ip);
+}
+
+router_name = addr->router->name;
+transport_name = addr->transport->name;
+expand_string(dbl_host_defer_query);
+router_name = transport_name = NULL;
+}
+#endif
+
+
+
/*************************************************
* Synchronize SMTP responses *
*************************************************/
+/* Do the client side of smtp-level authentication */
+/*
+Arguments:
+ buffer EHLO response from server (gets overwritten)
+ addrlist chain of potential addresses to deliver
+ host host to deliver to
+ ob transport options
+ ibp, obp comms channel control blocks
+
+Returns:
+ OK Success, or failed (but not required): global "smtp_authenticated" set
+ DEFER Failed authentication (and was required)
+ ERROR Internal problem
+
+ FAIL_SEND Failed communications - transmit
+ FAIL - response
+*/
+
+int
+smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
+ smtp_transport_options_block *ob, BOOL is_esmtp,
+ smtp_inblock *ibp, smtp_outblock *obp)
+{
+ int require_auth;
+ uschar *fail_reason = US"server did not advertise AUTH support";
+
+ smtp_authenticated = FALSE;
+ client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
+ require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
+ host->name, host->address, NULL);
+
+ if (is_esmtp && !regex_AUTH) regex_AUTH =
+ regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
+ FALSE, TRUE);
+
+ if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
+ {
+ uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
+ expand_nmax = -1; /* reset */
+
+ /* Must not do this check until after we have saved the result of the
+ regex match above. */
+
+ if (require_auth == OK ||
+ verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
+ host->address, NULL) == OK)
+ {
+ auth_instance *au;
+ fail_reason = US"no common mechanisms were found";
+
+ DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
+
+ /* Scan the configured authenticators looking for one which is configured
+ for use as a client, which is not suppressed by client_condition, and
+ whose name matches an authentication mechanism supported by the server.
+ If one is found, attempt to authenticate by calling its client function.
+ */
+
+ for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
+ {
+ uschar *p = names;
+ if (!au->client ||
+ (au->client_condition != NULL &&
+ !expand_check_condition(au->client_condition, au->name,
+ US"client authenticator")))
+ {
+ DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
+ au->name,
+ (au->client)? "client_condition is false" :
+ "not configured as a client");
+ continue;
+ }
+
+ /* Loop to scan supported server mechanisms */
+
+ while (*p != 0)
+ {
+ int rc;
+ int len = Ustrlen(au->public_name);
+ while (isspace(*p)) p++;
+
+ if (strncmpic(au->public_name, p, len) != 0 ||
+ (p[len] != 0 && !isspace(p[len])))
+ {
+ while (*p != 0 && !isspace(*p)) p++;
+ continue;
+ }
+
+ /* Found data for a listed mechanism. Call its client entry. Set
+ a flag in the outblock so that data is overwritten after sending so
+ that reflections don't show it. */
+
+ fail_reason = US"authentication attempt(s) failed";
+ obp->authenticating = TRUE;
+ rc = (au->info->clientcode)(au, ibp, obp,
+ ob->command_timeout, buffer, bufsize);
+ obp->authenticating = FALSE;
+ DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
+ au->name, rc);
+
+ /* A temporary authentication failure must hold up delivery to
+ this host. After a permanent authentication failure, we carry on
+ to try other authentication methods. If all fail hard, try to
+ deliver the message unauthenticated unless require_auth was set. */
+
+ switch(rc)
+ {
+ case OK:
+ smtp_authenticated = TRUE; /* stops the outer loop */
+ client_authenticator = au->name;
+ if (au->set_client_id != NULL)
+ client_authenticated_id = expand_string(au->set_client_id);
+ break;
+
+ /* Failure after writing a command */
+
+ case FAIL_SEND:
+ return FAIL_SEND;
+
+ /* Failure after reading a response */
+
+ case FAIL:
+ if (errno != 0 || buffer[0] != '5') return FAIL;
+ log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
+ au->name, host->name, host->address, buffer);
+ break;
+
+ /* Failure by some other means. In effect, the authenticator
+ decided it wasn't prepared to handle this case. Typically this
+ is the result of "fail" in an expansion string. Do we need to
+ log anything here? Feb 2006: a message is now put in the buffer
+ if logging is required. */
+
+ case CANCELLED:
+ if (*buffer != 0)
+ log_write(0, LOG_MAIN, "%s authenticator cancelled "
+ "authentication H=%s [%s] %s", au->name, host->name,
+ host->address, buffer);
+ break;
+
+ /* Internal problem, message in buffer. */
+
+ case ERROR:
+ set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
+ return ERROR;
+ }
+
+ break; /* If not authenticated, try next authenticator */
+ } /* Loop for scanning supported server mechanisms */
+ } /* Loop for further authenticators */
+ }
+ }
+
+ /* If we haven't authenticated, but are required to, give up. */
+
+ if (require_auth == OK && !smtp_authenticated)
+ {
+ set_errno(addrlist, ERRNO_AUTHFAIL,
+ string_sprintf("authentication required but %s", fail_reason), DEFER,
+ FALSE);
+ return DEFER;
+ }
+
+ return OK;
+}
+
+
+/* Construct AUTH appendix string for MAIL TO */
+/*
+Arguments
+ buffer to build string
+ addrlist chain of potential addresses to deliver
+ ob transport options
+
+Globals smtp_authenticated
+ client_authenticated_sender
+Return True on error, otherwise buffer has (possibly empty) terminated string
+*/
+
+BOOL
+smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
+ smtp_transport_options_block *ob)
+{
+uschar *local_authenticated_sender = authenticated_sender;
+
+#ifdef notdef
+ debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
+#endif
+
+if (ob->authenticated_sender != NULL)
+ {
+ uschar *new = expand_string(ob->authenticated_sender);
+ if (new == NULL)
+ {
+ if (!expand_string_forcedfail)
+ {
+ uschar *message = string_sprintf("failed to expand "
+ "authenticated_sender: %s", expand_string_message);
+ set_errno(addrlist, 0, message, DEFER, FALSE);
+ return TRUE;
+ }
+ }
+ else if (new[0] != 0) local_authenticated_sender = new;
+ }
+
+/* Add the authenticated sender address if present */
+
+if ((smtp_authenticated || ob->authenticated_sender_force) &&
+ local_authenticated_sender != NULL)
+ {
+ string_format(buffer, bufsize, " AUTH=%s",
+ auth_xtextencode(local_authenticated_sender,
+ Ustrlen(local_authenticated_sender)));
+ client_authenticated_sender = string_copy(local_authenticated_sender);
+ }
+else
+ *buffer= 0;
+
+return FALSE;
+}
+
+
+
/*************************************************
* Deliver address list to given host *
*************************************************/
smtp_transport_options_block *ob =
(smtp_transport_options_block *)(tblock->options_block);
BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
+BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
BOOL ok = FALSE;
BOOL send_rset = TRUE;
BOOL send_quit = TRUE;
BOOL esmtp = TRUE;
BOOL pending_MAIL;
BOOL pass_message = FALSE;
+#ifdef EXPERIMENTAL_PRDR
+BOOL prdr_offered = FALSE;
+BOOL prdr_active;
+#endif
smtp_inblock inblock;
smtp_outblock outblock;
int max_rcpt = tblock->max_addresses;
uschar *igquotstr = US"";
-uschar *local_authenticated_sender = authenticated_sender;
uschar *helo_data = NULL;
uschar *message = NULL;
uschar new_message_id[MESSAGE_ID_LENGTH + 1];
/* Reset the parameters of a TLS session. */
-tls_cipher = NULL;
-tls_peerdn = NULL;
+tls_in.bits = 0;
+tls_in.cipher = NULL; /* for back-compatible behaviour */
+tls_in.peerdn = NULL;
+#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
+tls_in.sni = NULL;
+#endif
-/* If an authenticated_sender override has been specified for this transport
-instance, expand it. If the expansion is forced to fail, and there was already
-an authenticated_sender for this message, the original value will be used.
-Other expansion failures are serious. An empty result is ignored, but there is
-otherwise no check - this feature is expected to be used with LMTP and other
-cases where non-standard addresses (e.g. without domains) might be required. */
+tls_out.bits = 0;
+tls_out.cipher = NULL; /* the one we may use for this transport */
+tls_out.peerdn = NULL;
+#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
+tls_out.sni = NULL;
+#endif
-if (ob->authenticated_sender != NULL)
+#ifndef SUPPORT_TLS
+if (smtps)
{
- uschar *new = expand_string(ob->authenticated_sender);
- if (new == NULL)
- {
- if (!expand_string_forcedfail)
- {
- uschar *message = string_sprintf("failed to expand "
- "authenticated_sender: %s", expand_string_message);
- set_errno(addrlist, 0, message, DEFER, FALSE);
- return ERROR;
- }
- }
- else if (new[0] != 0) local_authenticated_sender = new;
+ set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
+ return ERROR;
}
+#endif
/* Make a connection to the host if this isn't a continued delivery, and handle
the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
{
inblock.sock = outblock.sock =
smtp_connect(host, host_af, port, interface, ob->connect_timeout,
- ob->keepalive); /* This puts port into host->port */
+ ob->keepalive, ob->dscp); /* This puts port into host->port */
if (inblock.sock < 0)
{
is nevertheless a reasonably clean way of programming this kind of logic,
where you want to escape on any error. */
- if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
- ob->command_timeout)) goto RESPONSE_FAILED;
+ if (!smtps)
+ {
+ if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
+ ob->command_timeout)) goto RESPONSE_FAILED;
- /* Now check if the helo_data expansion went well, and sign off cleanly if it
- didn't. */
+ /* Now check if the helo_data expansion went well, and sign off cleanly if
+ it didn't. */
- if (helo_data == NULL)
- {
- uschar *message = string_sprintf("failed to expand helo_data: %s",
- expand_string_message);
- set_errno(addrlist, 0, message, DEFER, FALSE);
- yield = DEFER;
- goto SEND_QUIT;
+ if (helo_data == NULL)
+ {
+ uschar *message = string_sprintf("failed to expand helo_data: %s",
+ expand_string_message);
+ set_errno(addrlist, 0, message, DEFER, FALSE);
+ yield = DEFER;
+ goto SEND_QUIT;
+ }
}
/** Debugging without sending a message
esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
host->name, host->address, NULL) != OK;
+ /* Alas; be careful, since this goto is not an error-out, so conceivably
+ we might set data between here and the target which we assume to exist
+ and be usable. I can see this coming back to bite us. */
+ #ifdef SUPPORT_TLS
+ if (smtps)
+ {
+ tls_offered = TRUE;
+ suppress_tls = FALSE;
+ ob->tls_tempfail_tryclear = FALSE;
+ smtp_command = US"SSL-on-connect";
+ goto TLS_NEGOTIATE;
+ }
+ #endif
+
if (esmtp)
{
if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
PCRE_EOPT, NULL, 0) >= 0;
#endif
+
+ #ifdef EXPERIMENTAL_PRDR
+ prdr_offered = esmtp &&
+ (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
+ PCRE_EOPT, NULL, 0) >= 0) &&
+ (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
+ host->address, NULL) == OK);
+
+ if (prdr_offered)
+ {DEBUG(D_transport) debug_printf("PRDR usable\n");}
+ #endif
}
/* For continuing deliveries down the same channel, the socket is the standard
if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
ob->command_timeout))
{
- Ustrncpy(buffer, buffer2, sizeof(buffer));
if (errno != 0 || buffer2[0] == 0 ||
(buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
+ {
+ Ustrncpy(buffer, buffer2, sizeof(buffer));
goto RESPONSE_FAILED;
+ }
}
/* STARTTLS accepted: try to negotiate a TLS session. */
else
+ TLS_NEGOTIATE:
{
int rc = tls_client_start(inblock.sock,
host,
addrlist,
- NULL, /* No DH param */
ob->tls_certificate,
ob->tls_privatekey,
+ ob->tls_sni,
ob->tls_verify_certificates,
ob->tls_crl,
ob->tls_require_ciphers,
- ob->gnutls_require_mac,
- ob->gnutls_require_kx,
- ob->gnutls_require_proto,
+#ifdef EXPERIMENTAL_OCSP
+ ob->hosts_require_ocsp,
+#endif
+ ob->tls_dh_min_bits,
ob->command_timeout);
/* TLS negotiation failed; give an error. From outside, this function may
{
if (addr->transport_return == PENDING_DEFER)
{
- addr->cipher = tls_cipher;
- addr->peerdn = tls_peerdn;
+ addr->cipher = tls_out.cipher;
+ addr->peerdn = tls_out.peerdn;
}
}
}
}
+/* if smtps, we'll have smtp_command set to something else; always safe to
+reset it here. */
+smtp_command = big_buffer;
+
/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
helo_data is null, we are dealing with a connection that was passed from
another process, and so we won't have expanded helo_data above. We have to
expand it here. $sending_ip_address and $sending_port are set up right at the
start of the Exim process (in exim.c). */
-if (tls_active >= 0)
+if (tls_out.active >= 0)
{
+ char *greeting_cmd;
if (helo_data == NULL)
{
helo_data = expand_string(ob->helo_data);
}
}
- if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", lmtp? "LHLO" : "EHLO",
- helo_data) < 0)
+ /* For SMTPS we need to wait for the initial OK response. */
+ if (smtps)
+ {
+ if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
+ ob->command_timeout)) goto RESPONSE_FAILED;
+ }
+
+ if (esmtp)
+ greeting_cmd = "EHLO";
+ else
+ {
+ greeting_cmd = "HELO";
+ DEBUG(D_transport)
+ debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
+ }
+
+ if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
+ lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
goto SEND_FAILED;
if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
ob->command_timeout))
if (continue_hostname == NULL
#ifdef SUPPORT_TLS
- || tls_active >= 0
+ || tls_out.active >= 0
#endif
)
{
- int require_auth;
- uschar *fail_reason = US"server did not advertise AUTH support";
-
/* Set for IGNOREQUOTA if the response to LHLO specifies support and the
lmtp_ignore_quota option was set. */
DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
smtp_use_pipelining? "" : "not ");
+#ifdef EXPERIMENTAL_PRDR
+ prdr_offered = esmtp &&
+ pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
+ PCRE_EOPT, NULL, 0) >= 0 &&
+ verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
+ host->address, NULL) == OK;
+
+ if (prdr_offered)
+ {DEBUG(D_transport) debug_printf("PRDR usable\n");}
+#endif
+
/* Note if the response to EHLO specifies support for the AUTH extension.
If it has, check that this host is one we want to authenticate to, and do
the business. The host name and address must be available when the
authenticator's client driver is running. */
- smtp_authenticated = FALSE;
- require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
- host->name, host->address, NULL);
-
- if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
- {
- uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
- expand_nmax = -1; /* reset */
-
- /* Must not do this check until after we have saved the result of the
- regex match above. */
-
- if (require_auth == OK ||
- verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
- host->address, NULL) == OK)
- {
- auth_instance *au;
- fail_reason = US"no common mechanisms were found";
-
- DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
-
- /* Scan the configured authenticators looking for one which is configured
- for use as a client, which is not suppressed by client_condition, and
- whose name matches an authentication mechanism supported by the server.
- If one is found, attempt to authenticate by calling its client function.
- */
-
- for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
- {
- uschar *p = names;
- if (!au->client ||
- (au->client_condition != NULL &&
- !expand_check_condition(au->client_condition, au->name,
- US"client authenticator")))
- {
- DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
- au->name,
- (au->client)? "client_condition is false" :
- "not configured as a client");
- continue;
- }
-
- /* Loop to scan supported server mechanisms */
-
- while (*p != 0)
- {
- int rc;
- int len = Ustrlen(au->public_name);
- while (isspace(*p)) p++;
-
- if (strncmpic(au->public_name, p, len) != 0 ||
- (p[len] != 0 && !isspace(p[len])))
- {
- while (*p != 0 && !isspace(*p)) p++;
- continue;
- }
-
- /* Found data for a listed mechanism. Call its client entry. Set
- a flag in the outblock so that data is overwritten after sending so
- that reflections don't show it. */
-
- fail_reason = US"authentication attempt(s) failed";
- outblock.authenticating = TRUE;
- rc = (au->info->clientcode)(au, &inblock, &outblock,
- ob->command_timeout, buffer, sizeof(buffer));
- outblock.authenticating = FALSE;
- DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
- au->name, rc);
-
- /* A temporary authentication failure must hold up delivery to
- this host. After a permanent authentication failure, we carry on
- to try other authentication methods. If all fail hard, try to
- deliver the message unauthenticated unless require_auth was set. */
-
- switch(rc)
- {
- case OK:
- smtp_authenticated = TRUE; /* stops the outer loop */
- break;
-
- /* Failure after writing a command */
-
- case FAIL_SEND:
- goto SEND_FAILED;
-
- /* Failure after reading a response */
-
- case FAIL:
- if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED;
- log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
- au->name, host->name, host->address, buffer);
- break;
-
- /* Failure by some other means. In effect, the authenticator
- decided it wasn't prepared to handle this case. Typically this
- is the result of "fail" in an expansion string. Do we need to
- log anything here? Feb 2006: a message is now put in the buffer
- if logging is required. */
-
- case CANCELLED:
- if (*buffer != 0)
- log_write(0, LOG_MAIN, "%s authenticator cancelled "
- "authentication H=%s [%s] %s", au->name, host->name,
- host->address, buffer);
- break;
-
- /* Internal problem, message in buffer. */
-
- case ERROR:
- yield = ERROR;
- set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
- goto SEND_QUIT;
- }
-
- break; /* If not authenticated, try next authenticator */
- } /* Loop for scanning supported server mechanisms */
- } /* Loop for further authenticators */
- }
- }
-
- /* If we haven't authenticated, but are required to, give up. */
-
- if (require_auth == OK && !smtp_authenticated)
+ switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
+ ob, esmtp, &inblock, &outblock))
{
- yield = DEFER;
- set_errno(addrlist, ERRNO_AUTHFAIL,
- string_sprintf("authentication required but %s", fail_reason), DEFER,
- FALSE);
- goto SEND_QUIT;
+ default: goto SEND_QUIT;
+ case OK: break;
+ case FAIL_SEND: goto SEND_FAILED;
+ case FAIL: goto RESPONSE_FAILED;
}
}
sprintf(CS buffer, "%.50s transport", tblock->name);
rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
TRUE, DEFER, addrlist, buffer, NULL);
+ transport_filter_timeout = tblock->filter_timeout;
/* On failure, copy the error to all addresses, abandon the SMTP call, and
yield ERROR. */
while (*p) p++;
}
-/* Add the authenticated sender address if present */
-
-if ((smtp_authenticated || ob->authenticated_sender_force) &&
- local_authenticated_sender != NULL)
+#ifdef EXPERIMENTAL_PRDR
+prdr_active = FALSE;
+if (prdr_offered)
{
- string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s",
- auth_xtextencode(local_authenticated_sender,
- Ustrlen(local_authenticated_sender)));
+ for (addr = first_addr; addr; addr = addr->next)
+ if (addr->transport_return == PENDING_DEFER)
+ {
+ for (addr = addr->next; addr; addr = addr->next)
+ if (addr->transport_return == PENDING_DEFER)
+ { /* at least two recipients to send */
+ prdr_active = TRUE;
+ sprintf(CS p, " PRDR"); p += 5;
+ goto prdr_is_active;
+ }
+ break;
+ }
}
+prdr_is_active:
+#endif
+
+/* If an authenticated_sender override has been specified for this transport
+instance, expand it. If the expansion is forced to fail, and there was already
+an authenticated_sender for this message, the original value will be used.
+Other expansion failures are serious. An empty result is ignored, but there is
+otherwise no check - this feature is expected to be used with LMTP and other
+cases where non-standard addresses (e.g. without domains) might be required. */
+
+if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
+ return ERROR;
/* From here until we send the DATA command, we can make use of PIPELINING
if the server host supports it. The code has to be able to check the responses
DEBUG(D_transport|D_v)
debug_printf(" SMTP>> writing message and terminating \".\"\n");
transport_count = 0;
-#if (defined EXPERIMENTAL_DOMAINKEYS) || (defined EXPERIMENTAL_DKIM)
+#ifndef DISABLE_DKIM
ok = dkim_transport_write_message(addrlist, inblock.sock,
topt_use_crlf | topt_end_dot | topt_escape_headers |
(tblock->body_only? topt_no_headers : 0) |
US".", US"..", /* Escaping strings */
tblock->rewrite_rules, tblock->rewrite_existflags,
ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
- ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers,
- ob->dk_private_key, ob->dk_domain, ob->dk_selector,
- ob->dk_canon, ob->dk_headers, ob->dk_strict
+ ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
);
#else
ok = transport_write_message(addrlist, inblock.sock,
smtp_command = US"end of data";
- /* For SMTP, we now read a single response that applies to the whole message.
- If it is OK, then all the addresses have been delivered. */
+#ifdef EXPERIMENTAL_PRDR
+ /* For PRDR we optionally get a partial-responses warning
+ * followed by the individual responses, before going on with
+ * the overall response. If we don't get the warning then deal
+ * with per non-PRDR. */
+ if(prdr_active)
+ {
+ ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
+ ob->final_timeout);
+ if (!ok && errno == 0)
+ switch(buffer[0])
+ {
+ case '2': prdr_active = FALSE;
+ ok = TRUE;
+ break;
+ case '4': errno = ERRNO_DATA4XX;
+ addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
+ break;
+ }
+ }
+ else
+#endif
+
+ /* For non-PRDR SMTP, we now read a single response that applies to the
+ whole message. If it is OK, then all the addresses have been delivered. */
if (!lmtp)
{
/* Set up confirmation if needed - applies only to SMTP */
- if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
+ if (
+ #ifndef EXPERIMENTAL_DBL
+ (log_extra_selector & LX_smtp_confirmation) != 0 &&
+ #endif
+ !lmtp
+ )
{
uschar *s = string_printing(buffer);
conf = (s == buffer)? (uschar *)string_copy(s) : s;
}
- /* Process all transported addresses - for LMTP, read a status for
+ /* Process all transported addresses - for LMTP or PRDR, read a status for
each one. */
for (addr = addrlist; addr != first_addr; addr = addr->next)
address. For temporary errors, add a retry item for the address so that
it doesn't get tried again too soon. */
+#ifdef EXPERIMENTAL_PRDR
+ if (lmtp || prdr_active)
+#else
if (lmtp)
+#endif
{
if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
ob->final_timeout))
{
if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
- addr->message = string_sprintf("LMTP error after %s: %s",
+ addr->message = string_sprintf(
+#ifdef EXPERIMENTAL_PRDR
+ "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
+#else
+ "LMTP error after %s: %s",
+#endif
big_buffer, string_printing(buffer));
setflag(addr, af_pass_message); /* Allow message to go to user */
if (buffer[0] == '5')
errno = ERRNO_DATA4XX;
addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
addr->transport_return = DEFER;
- retry_add_item(addr, addr->address_retry_key, 0);
+#ifdef EXPERIMENTAL_PRDR
+ if (!prdr_active)
+#endif
+ retry_add_item(addr, addr->address_retry_key, 0);
}
continue;
}
completed_address = TRUE; /* NOW we can set this flag */
+ if ((log_extra_selector & LX_smtp_confirmation) != 0)
+ {
+ uschar *s = string_printing(buffer);
+ conf = (s == buffer)? (uschar *)string_copy(s) : s;
+ }
}
/* SMTP, or success return from LMTP for this address. Pass back the
addr->host_used = thost;
addr->special_action = flag;
addr->message = conf;
+#ifdef EXPERIMENTAL_PRDR
+ if (prdr_active) addr->flags |= af_prdr_used;
+#endif
flag = '-';
- /* Update the journal. For homonymic addresses, use the base address plus
- the transport name. See lots of comments in deliver.c about the reasons
- for the complications when homonyms are involved. Just carry on after
- write error, as it may prove possible to update the spool file later. */
-
- if (testflag(addr, af_homonym))
- sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
- else
- sprintf(CS buffer, "%.500s\n", addr->unique);
-
- DEBUG(D_deliver) debug_printf("journalling %s", buffer);
- len = Ustrlen(CS buffer);
- if (write(journal_fd, buffer, len) != len)
- log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
- "%s: %s", buffer, strerror(errno));
+#ifdef EXPERIMENTAL_PRDR
+ if (!prdr_active)
+#endif
+ {
+ /* Update the journal. For homonymic addresses, use the base address plus
+ the transport name. See lots of comments in deliver.c about the reasons
+ for the complications when homonyms are involved. Just carry on after
+ write error, as it may prove possible to update the spool file later. */
+
+ if (testflag(addr, af_homonym))
+ sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
+ else
+ sprintf(CS buffer, "%.500s\n", addr->unique);
+
+ DEBUG(D_deliver) debug_printf("journalling %s", buffer);
+ len = Ustrlen(CS buffer);
+ if (write(journal_fd, buffer, len) != len)
+ log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
+ "%s: %s", buffer, strerror(errno));
+ }
}
+#ifdef EXPERIMENTAL_PRDR
+ if (prdr_active)
+ {
+ /* PRDR - get the final, overall response. For any non-success
+ upgrade all the address statuses. */
+ ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
+ ob->final_timeout);
+ if (!ok)
+ {
+ if(errno == 0 && buffer[0] == '4')
+ {
+ errno = ERRNO_DATA4XX;
+ addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
+ }
+ for (addr = addrlist; addr != first_addr; addr = addr->next)
+ if (buffer[0] == '5' || addr->transport_return == OK)
+ addr->transport_return = PENDING_OK; /* allow set_errno action */
+ goto RESPONSE_FAILED;
+ }
+
+ /* Update the journal, or setup retry. */
+ for (addr = addrlist; addr != first_addr; addr = addr->next)
+ if (addr->transport_return == OK)
+ {
+ if (testflag(addr, af_homonym))
+ sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
+ else
+ sprintf(CS buffer, "%.500s\n", addr->unique);
+
+ DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
+ len = Ustrlen(CS buffer);
+ if (write(journal_fd, buffer, len) != len)
+ log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
+ "%s: %s", buffer, strerror(errno));
+ }
+ else if (addr->transport_return == DEFER)
+ retry_add_item(addr, addr->address_retry_key, -2);
+ }
+#endif
+
/* Ensure the journal file is pushed out to disk. */
if (EXIMfsync(journal_fd) < 0)
BOOL more;
if (first_addr != NULL || continue_more ||
(
- (tls_active < 0 ||
+ (tls_out.active < 0 ||
verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
host->address, NULL) != OK)
&&
don't get a good response, we don't attempt to pass the socket on. */
#ifdef SUPPORT_TLS
- if (tls_active >= 0)
+ if (tls_out.active >= 0)
{
- tls_close(TRUE);
- ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
- smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
- ob->command_timeout);
+ tls_close(FALSE, TRUE);
+ if (smtps)
+ ok = FALSE;
+ else
+ ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
+ smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
+ ob->command_timeout);
}
#endif
END_OFF:
#ifdef SUPPORT_TLS
-tls_close(TRUE);
+tls_close(FALSE, TRUE);
#endif
/* Close the socket, and return the appropriate value, first setting
host_build_hostlist(&hostlist, s, ob->hosts_randomize);
+ /* Check that the expansion yielded something useful. */
+ if (hostlist == NULL)
+ {
+ addrlist->message =
+ string_sprintf("%s transport has empty hosts setting", tblock->name);
+ addrlist->transport_return = PANIC;
+ return FALSE; /* Only top address has status */
+ }
+
/* If there was no expansion of hosts, save the host list for
next time. */
first_addr->basic_errno != ERRNO_TLSFAILURE)
write_logs(first_addr, host);
+ #ifdef EXPERIMENTAL_DBL
+ if (rc == DEFER)
+ dbl_write_defer_log(ob->dbl_host_defer_query, first_addr, host);
+ #endif
+
/* If STARTTLS was accepted, but there was a failure in setting up the
TLS session (usually a certificate screwup), and the host is not in
hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
expanded_hosts != NULL, &message_defer, TRUE);
if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
write_logs(first_addr, host);
+ #ifdef EXPERIMENTAL_DBL
+ if (rc == DEFER)
+ dbl_write_defer_log(ob->dbl_host_defer_query, first_addr, host);
+ #endif
}
#endif
}
/* Update the database which keeps information about which messages are waiting
for which hosts to become available. For some message-specific errors, the
update_waiting flag is turned off because we don't want follow-on deliveries in
-those cases. */
+those cases. If this transport instance is explicitly limited to one message
+per connection then follow-on deliveries are not possible and there's no need
+to create/update the per-transport wait-<transport_name> database. */
-if (update_waiting) transport_update_waiting(hostlist, tblock->name);
+if (update_waiting && tblock->connection_max_messages != 1)
+ transport_update_waiting(hostlist, tblock->name);
END_TRANSPORT:
git://git.exim.org / users / jgh / exim.git / blobdiff