* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2009 */
+/* Copyright (c) University of Cambridge 1995 - 2014 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions concerned with verifying things. The original code for callout
#include "exim.h"
+#include "transports/smtp.h"
+
+#define CUTTHROUGH_CMD_TIMEOUT 30 /* timeout for cutthrough-routing calls */
+#define CUTTHROUGH_DATA_TIMEOUT 60 /* timeout for cutthrough-routing calls */
+static smtp_outblock ctblock;
+uschar ctbuffer[8192];
/* Structure for caching DNSBL lookups */
#define MT_NOT 1
#define MT_ALL 2
+static uschar cutthrough_response(char, uschar **);
/*************************************************
*/
static dbdata_callout_cache *
-get_callout_cache_record(open_db *dbm_file, uschar *key, uschar *type,
+get_callout_cache_record(open_db *dbm_file, const uschar *key, uschar *type,
int positive_expire, int negative_expire)
{
BOOL negative;
uschar *address_key;
uschar *from_address;
uschar *random_local_part = NULL;
-uschar *save_deliver_domain = deliver_domain;
+const uschar *save_deliver_domain = deliver_domain;
uschar **failure_ptr = is_recipient?
&recipient_verify_failure : &sender_verify_failure;
open_db dbblock;
if (is_recipient)
{
- if ((options & vopt_callout_recipsender) != 0)
+ if (options & vopt_callout_recipsender)
{
address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
from_address = sender_address;
}
- else if ((options & vopt_callout_recippmaster) != 0)
+ else if (options & vopt_callout_recippmaster)
{
address_key = string_sprintf("%s/<postmaster@%s>", addr->address,
qualify_domain_sender);
dbm_file = NULL;
}
-/* The information wasn't available in the cache, so we have to do a real
-callout and save the result in the cache for next time, unless no_cache is set,
-or unless we have a previously cached negative random result. If we are to test
-with a random local part, ensure that such a local part is available. If not,
-log the fact, but carry on without randomming. */
-
-if (callout_random && callout_random_local_part != NULL)
+if (!addr->transport)
{
- random_local_part = expand_string(callout_random_local_part);
- if (random_local_part == NULL)
- log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand "
- "callout_random_local_part: %s", expand_string_message);
+ HDEBUG(D_verify) debug_printf("cannot callout via null transport\n");
}
+else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0)
+ log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp",
+ addr->transport->name, addr->transport->driver_name);
+else
+ {
+ smtp_transport_options_block *ob =
+ (smtp_transport_options_block *)addr->transport->options_block;
-/* Default the connect and overall callout timeouts if not set, and record the
-time we are starting so that we can enforce it. */
+ /* The information wasn't available in the cache, so we have to do a real
+ callout and save the result in the cache for next time, unless no_cache is set,
+ or unless we have a previously cached negative random result. If we are to test
+ with a random local part, ensure that such a local part is available. If not,
+ log the fact, but carry on without randomming. */
-if (callout_overall < 0) callout_overall = 4 * callout;
-if (callout_connect < 0) callout_connect = callout;
-callout_start_time = time(NULL);
+ if (callout_random && callout_random_local_part != NULL)
+ {
+ random_local_part = expand_string(callout_random_local_part);
+ if (random_local_part == NULL)
+ log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand "
+ "callout_random_local_part: %s", expand_string_message);
+ }
-/* Before doing a real callout, if this is an SMTP connection, flush the SMTP
-output because a callout might take some time. When PIPELINING is active and
-there are many recipients, the total time for doing lots of callouts can add up
-and cause the client to time out. So in this case we forgo the PIPELINING
-optimization. */
+ /* Default the connect and overall callout timeouts if not set, and record the
+ time we are starting so that we can enforce it. */
-if (smtp_out != NULL && !disable_callout_flush) mac_smtp_fflush();
+ if (callout_overall < 0) callout_overall = 4 * callout;
+ if (callout_connect < 0) callout_connect = callout;
+ callout_start_time = time(NULL);
-/* Now make connections to the hosts and do real callouts. The list of hosts
-is passed in as an argument. */
+ /* Before doing a real callout, if this is an SMTP connection, flush the SMTP
+ output because a callout might take some time. When PIPELINING is active and
+ there are many recipients, the total time for doing lots of callouts can add up
+ and cause the client to time out. So in this case we forgo the PIPELINING
+ optimization. */
-for (host = host_list; host != NULL && !done; host = host->next)
- {
- smtp_inblock inblock;
- smtp_outblock outblock;
- int host_af;
- int port = 25;
- BOOL send_quit = TRUE;
- uschar *active_hostname = smtp_active_hostname;
- uschar *helo = US"HELO";
- uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
- uschar inbuffer[4096];
- uschar outbuffer[1024];
- uschar responsebuffer[4096];
-
- clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
- clearflag(addr, af_verify_nsfail); /* null sender callout flag */
-
- /* Skip this host if we don't have an IP address for it. */
-
- if (host->address == NULL)
+ if (smtp_out != NULL && !disable_callout_flush) mac_smtp_fflush();
+
+/* cutthrough-multi: if a nonfirst rcpt has the same routing as the first,
+and we are holding a cutthrough conn open, we can just append the rcpt to
+that conn for verification purposes (and later delivery also). Simplest
+coding means skipping this whole loop and doing the append separately.
+
+We will need to remember it has been appended so that rcpt-acl tail code
+can do it there for the non-rcpt-verify case. For this we keep an addresscount.
+*/
+
+ /* Can we re-use an open cutthrough connection? */
+ if ( cutthrough.fd >= 0
+ && (options & (vopt_callout_recipsender | vopt_callout_recippmaster))
+ == vopt_callout_recipsender
+ && !random_local_part
+ && !pm_mailfrom
+ )
{
- DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
- host->name);
- continue;
+ if (addr->transport == cutthrough.addr.transport)
+ for (host = host_list; host; host = host->next)
+ if (Ustrcmp(host->address, cutthrough.host.address) == 0)
+ {
+ int host_af;
+ uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
+ int port = 25;
+
+ deliver_host = host->name;
+ deliver_host_address = host->address;
+ deliver_host_port = host->port;
+ deliver_domain = addr->domain;
+ transport_name = addr->transport->name;
+
+ host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
+
+ if (!smtp_get_interface(tf->interface, host_af, addr, NULL, &interface,
+ US"callout") ||
+ !smtp_get_port(tf->port, addr, &port, US"callout"))
+ log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
+ addr->message);
+
+ if ( ( interface == cutthrough.interface
+ || ( interface
+ && cutthrough.interface
+ && Ustrcmp(interface, cutthrough.interface) == 0
+ ) )
+ && port == cutthrough.host.port
+ )
+ {
+ uschar * resp;
+
+ /* Match! Send the RCPT TO, append the addr, set done */
+ done =
+ smtp_write_command(&ctblock, FALSE, "RCPT TO:<%.1000s>\r\n",
+ transport_rcpt_address(addr,
+ (addr->transport == NULL)? FALSE :
+ addr->transport->rcpt_include_affixes)) >= 0 &&
+ cutthrough_response('2', &resp) == '2';
+
+ /* This would go horribly wrong if a callout fail was ignored by ACL.
+ We punt by abandoning cutthrough on a reject, like the
+ first-rcpt does. */
+
+ if (done)
+ {
+ address_item * na = store_get(sizeof(address_item));
+ *na = cutthrough.addr;
+ cutthrough.addr = *addr;
+ cutthrough.addr.host_used = &cutthrough.host;
+ cutthrough.addr.next = na;
+
+ cutthrough.nrcpt++;
+ }
+ else
+ {
+ cancel_cutthrough_connection("recipient rejected");
+ if (errno == ETIMEDOUT)
+ {
+ HDEBUG(D_verify) debug_printf("SMTP timeout\n");
+ }
+ else if (errno == 0)
+ {
+ if (*resp == 0)
+ Ustrcpy(resp, US"connection dropped");
+
+ addr->message =
+ string_sprintf("response to \"%s\" from %s [%s] was: %s",
+ big_buffer, host->name, host->address,
+ string_printing(resp));
+
+ addr->user_message =
+ string_sprintf("Callout verification failed:\n%s", resp);
+
+ /* Hard rejection ends the process */
+
+ if (resp[0] == '5') /* Address rejected */
+ {
+ yield = FAIL;
+ done = TRUE;
+ }
+ }
+ }
+ }
+ break;
+ }
+ if (!done)
+ cancel_cutthrough_connection("incompatible connection");
}
- /* Check the overall callout timeout */
+ /* Now make connections to the hosts and do real callouts. The list of hosts
+ is passed in as an argument. */
- if (time(NULL) - callout_start_time >= callout_overall)
+ for (host = host_list; host != NULL && !done; host = host->next)
{
- HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
- break;
- }
+ smtp_inblock inblock;
+ smtp_outblock outblock;
+ int host_af;
+ int port = 25;
+ BOOL send_quit = TRUE;
+ uschar *active_hostname = smtp_active_hostname;
+ BOOL lmtp;
+ BOOL smtps;
+ BOOL esmtp;
+ BOOL suppress_tls = FALSE;
+ uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
+#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
+ BOOL dane = FALSE;
+ BOOL dane_required;
+ dns_answer tlsa_dnsa;
+#endif
+ uschar inbuffer[4096];
+ uschar outbuffer[1024];
+ uschar responsebuffer[4096];
- /* Set IPv4 or IPv6 */
+ clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
+ clearflag(addr, af_verify_nsfail); /* null sender callout flag */
- host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
+ /* Skip this host if we don't have an IP address for it. */
- /* Expand and interpret the interface and port strings. The latter will not
- be used if there is a host-specific port (e.g. from a manualroute router).
- This has to be delayed till now, because they may expand differently for
- different hosts. If there's a failure, log it, but carry on with the
- defaults. */
+ if (host->address == NULL)
+ {
+ DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
+ host->name);
+ continue;
+ }
- deliver_host = host->name;
- deliver_host_address = host->address;
- deliver_domain = addr->domain;
+ /* Check the overall callout timeout */
- if (!smtp_get_interface(tf->interface, host_af, addr, NULL, &interface,
- US"callout") ||
- !smtp_get_port(tf->port, addr, &port, US"callout"))
- log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
- addr->message);
+ if (time(NULL) - callout_start_time >= callout_overall)
+ {
+ HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
+ break;
+ }
- /* Set HELO string according to the protocol */
+ /* Set IPv4 or IPv6 */
- if (Ustrcmp(tf->protocol, "lmtp") == 0) helo = US"LHLO";
+ host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
- HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
+ /* Expand and interpret the interface and port strings. The latter will not
+ be used if there is a host-specific port (e.g. from a manualroute router).
+ This has to be delayed till now, because they may expand differently for
+ different hosts. If there's a failure, log it, but carry on with the
+ defaults. */
- /* Set up the buffer for reading SMTP response packets. */
+ deliver_host = host->name;
+ deliver_host_address = host->address;
+ deliver_host_port = host->port;
+ deliver_domain = addr->domain;
+ transport_name = addr->transport->name;
- inblock.buffer = inbuffer;
- inblock.buffersize = sizeof(inbuffer);
- inblock.ptr = inbuffer;
- inblock.ptrend = inbuffer;
+ if (!smtp_get_interface(tf->interface, host_af, addr, NULL, &interface,
+ US"callout") ||
+ !smtp_get_port(tf->port, addr, &port, US"callout"))
+ log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
+ addr->message);
- /* Set up the buffer for holding SMTP commands while pipelining */
+ /* Set HELO string according to the protocol */
+ lmtp= Ustrcmp(tf->protocol, "lmtp") == 0;
+ smtps= Ustrcmp(tf->protocol, "smtps") == 0;
- outblock.buffer = outbuffer;
- outblock.buffersize = sizeof(outbuffer);
- outblock.ptr = outbuffer;
- outblock.cmd_count = 0;
- outblock.authenticating = FALSE;
- /* Connect to the host; on failure, just loop for the next one, but we
- set the error for the last one. Use the callout_connect timeout. */
+ HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
- inblock.sock = outblock.sock =
- smtp_connect(host, host_af, port, interface, callout_connect, TRUE);
- if (inblock.sock < 0)
- {
- addr->message = string_sprintf("could not connect to %s [%s]: %s",
- host->name, host->address, strerror(errno));
- deliver_host = deliver_host_address = NULL;
- deliver_domain = save_deliver_domain;
- continue;
- }
+#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
+ {
+ int rc;
+
+ tls_out.dane_verified = FALSE;
+ tls_out.tlsa_usage = 0;
+
+ dane_required =
+ verify_check_given_host(&ob->hosts_require_dane, host) == OK;
+
+ if (host->dnssec == DS_YES)
+ {
+ if( dane_required
+ || verify_check_given_host(&ob->hosts_try_dane, host) == OK
+ )
+ if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK)
+ return rc;
+ }
+ else if (dane_required)
+ {
+ log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
+ return FAIL;
+ }
+
+ if (dane)
+ ob->tls_tempfail_tryclear = FALSE;
+ }
+#endif /*DANE*/
- /* Expand the helo_data string to find the host name to use. */
+ /* Set up the buffer for reading SMTP response packets. */
- if (tf->helo_data != NULL)
- {
- uschar *s = expand_string(tf->helo_data);
- if (s == NULL)
- log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: failed to expand transport's "
- "helo_data value for callout: %s", addr->address,
- expand_string_message);
- else active_hostname = s;
- }
+ inblock.buffer = inbuffer;
+ inblock.buffersize = sizeof(inbuffer);
+ inblock.ptr = inbuffer;
+ inblock.ptrend = inbuffer;
- deliver_host = deliver_host_address = NULL;
- deliver_domain = save_deliver_domain;
+ /* Set up the buffer for holding SMTP commands while pipelining */
- /* Wait for initial response, and send HELO. The smtp_write_command()
- function leaves its command in big_buffer. This is used in error responses.
- Initialize it in case the connection is rejected. */
+ outblock.buffer = outbuffer;
+ outblock.buffersize = sizeof(outbuffer);
+ outblock.ptr = outbuffer;
+ outblock.cmd_count = 0;
+ outblock.authenticating = FALSE;
- Ustrcpy(big_buffer, "initial connection");
+ /* Reset the parameters of a TLS session */
+ tls_out.cipher = tls_out.peerdn = tls_out.peercert = NULL;
- done =
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
- smtp_write_command(&outblock, FALSE, "%s %s\r\n", helo,
- active_hostname) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
+ /* Connect to the host; on failure, just loop for the next one, but we
+ set the error for the last one. Use the callout_connect timeout. */
- /* Failure to accept HELO is cached; this blocks the whole domain for all
- senders. I/O errors and defer responses are not cached. */
+ tls_retry_connection:
- if (!done)
- {
- *failure_ptr = US"mail"; /* At or before MAIL */
- if (errno == 0 && responsebuffer[0] == '5')
+ inblock.sock = outblock.sock =
+ smtp_connect(host, host_af, port, interface, callout_connect, TRUE, NULL
+#ifdef EXPERIMENTAL_EVENT
+ /*XXX event action? NULL for now. */
+ , NULL
+#endif
+ );
+ /* reconsider DSCP here */
+ if (inblock.sock < 0)
{
- setflag(addr, af_verify_nsfail);
- new_domain_record.result = ccache_reject;
+ addr->message = string_sprintf("could not connect to %s [%s]: %s",
+ host->name, host->address, strerror(errno));
+ transport_name = NULL;
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
+ continue;
}
- }
-
- /* Send the MAIL command */
-
- else done =
- smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n",
- from_address) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
- /* If the host does not accept MAIL FROM:<>, arrange to cache this
- information, but again, don't record anything for an I/O error or a defer. Do
- not cache rejections of MAIL when a non-empty sender has been used, because
- that blocks the whole domain for all senders. */
+ /* Expand the helo_data string to find the host name to use. */
- if (!done)
- {
- *failure_ptr = US"mail"; /* At or before MAIL */
- if (errno == 0 && responsebuffer[0] == '5')
+ if (tf->helo_data != NULL)
{
- setflag(addr, af_verify_nsfail);
- if (from_address[0] == 0)
- new_domain_record.result = ccache_reject_mfnull;
+ uschar *s = expand_string(tf->helo_data);
+ if (s == NULL)
+ log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: failed to expand transport's "
+ "helo_data value for callout: %s", addr->address,
+ expand_string_message);
+ else active_hostname = s;
}
- }
- /* Otherwise, proceed to check a "random" address (if required), then the
- given address, and the postmaster address (if required). Between each check,
- issue RSET, because some servers accept only one recipient after MAIL
- FROM:<>.
+ /* Wait for initial response, and send HELO. The smtp_write_command()
+ function leaves its command in big_buffer. This is used in error responses.
+ Initialize it in case the connection is rejected. */
- Before doing this, set the result in the domain cache record to "accept",
- unless its previous value was ccache_reject_mfnull. In that case, the domain
- rejects MAIL FROM:<> and we want to continue to remember that. When that is
- the case, we have got here only in the case of a recipient verification with
- a non-null sender. */
+ Ustrcpy(big_buffer, "initial connection");
- else
- {
- new_domain_record.result =
- (old_domain_cache_result == ccache_reject_mfnull)?
- ccache_reject_mfnull: ccache_accept;
+ /* Unless ssl-on-connect, wait for the initial greeting */
+ smtps_redo_greeting:
- /* Do the random local part check first */
+#ifdef SUPPORT_TLS
+ if (!smtps || (smtps && tls_out.active >= 0))
+#endif
+ {
+ if (!(done= smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout)))
+ goto RESPONSE_FAILED;
+
+#ifdef EXPERIMENTAL_EVENT
+ lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
+ : host->dnssec==DS_NO ? US"no" : NULL;
+ if (event_raise(addr->transport->event_action,
+ US"smtp:connect", responsebuffer))
+ {
+ lookup_dnssec_authenticated = NULL;
+ /* Logging? Debug? */
+ goto RESPONSE_FAILED;
+ }
+ lookup_dnssec_authenticated = NULL;
+#endif
+ }
- if (random_local_part != NULL)
+ /* Not worth checking greeting line for ESMTP support */
+ if (!(esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK))
+ DEBUG(D_transport)
+ debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
+
+ tls_redo_helo:
+
+#ifdef SUPPORT_TLS
+ if (smtps && tls_out.active < 0) /* ssl-on-connect, first pass */
{
- uschar randombuffer[1024];
- BOOL random_ok =
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part,
- addr->domain) >= 0 &&
- smtp_read_response(&inblock, randombuffer,
- sizeof(randombuffer), '2', callout);
+ tls_offered = TRUE;
+ ob->tls_tempfail_tryclear = FALSE;
+ }
+ else /* all other cases */
+#endif
- /* Remember when we last did a random test */
+ { esmtp_retry:
+
+ if (!(done= smtp_write_command(&outblock, FALSE, "%s %s\r\n",
+ !esmtp? "HELO" : lmtp? "LHLO" : "EHLO", active_hostname) >= 0))
+ goto SEND_FAILED;
+ if (!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout))
+ {
+ if (errno != 0 || responsebuffer[0] == 0 || lmtp || !esmtp || tls_out.active >= 0)
+ {
+ done= FALSE;
+ goto RESPONSE_FAILED;
+ }
+#ifdef SUPPORT_TLS
+ tls_offered = FALSE;
+#endif
+ esmtp = FALSE;
+ goto esmtp_retry; /* fallback to HELO */
+ }
- new_domain_record.random_stamp = time(NULL);
+ /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
+#ifdef SUPPORT_TLS
+ if (esmtp && !suppress_tls && tls_out.active < 0)
+ {
+ if (regex_STARTTLS == NULL) regex_STARTTLS =
+ regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
- /* If accepted, we aren't going to do any further tests below. */
+ tls_offered = pcre_exec(regex_STARTTLS, NULL, CS responsebuffer,
+ Ustrlen(responsebuffer), 0, PCRE_EOPT, NULL, 0) >= 0;
+ }
+ else
+ tls_offered = FALSE;
+#endif
+ }
- if (random_ok)
+ /* If TLS is available on this connection attempt to
+ start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
+ send another EHLO - the server may give a different answer in secure mode. We
+ use a separate buffer for reading the response to STARTTLS so that if it is
+ negative, the original EHLO data is available for subsequent analysis, should
+ the client not be required to use TLS. If the response is bad, copy the buffer
+ for error analysis. */
+
+#ifdef SUPPORT_TLS
+ if ( tls_offered
+ && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK
+ && verify_check_given_host(&ob->hosts_verify_avoid_tls, host) != OK
+ )
+ {
+ uschar buffer2[4096];
+ if ( !smtps
+ && !(done= smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") >= 0))
+ goto SEND_FAILED;
+
+ /* If there is an I/O error, transmission of this message is deferred. If
+ there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
+ false, we also defer. However, if there is a temporary rejection of STARTTLS
+ and tls_tempfail_tryclear is true, or if there is an outright rejection of
+ STARTTLS, we carry on. This means we will try to send the message in clear,
+ unless the host is in hosts_require_tls (tested below). */
+
+ if (!smtps && !smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
+ ob->command_timeout))
{
- new_domain_record.random_result = ccache_accept;
+ if (errno != 0 || buffer2[0] == 0 ||
+ (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
+ {
+ Ustrncpy(responsebuffer, buffer2, sizeof(responsebuffer));
+ done= FALSE;
+ goto RESPONSE_FAILED;
+ }
}
- /* Otherwise, cache a real negative response, and get back to the right
- state to send RCPT. Unless there's some problem such as a dropped
- connection, we expect to succeed, because the commands succeeded above. */
+ /* STARTTLS accepted or ssl-on-connect: try to negotiate a TLS session. */
+ else
+ {
+ int oldtimeout = ob->command_timeout;
+ int rc;
+
+ tls_negotiate:
+ ob->command_timeout = callout;
+ rc = tls_client_start(inblock.sock, host, addr, addr->transport
+# ifdef EXPERIMENTAL_DANE
+ , dane ? &tlsa_dnsa : NULL
+# endif
+ );
+ ob->command_timeout = oldtimeout;
+
+ /* TLS negotiation failed; give an error. Try in clear on a new
+ connection, if the options permit it for this host. */
+ if (rc != OK)
+ {
+ if (rc == DEFER)
+ {
+ (void)close(inblock.sock);
+# ifdef EXPERIMENTAL_EVENT
+ (void) event_raise(addr->transport->event_action,
+ US"tcp:close", NULL);
+# endif
+# ifdef EXPERIMENTAL_DANE
+ if (dane)
+ {
+ if (!dane_required)
+ {
+ log_write(0, LOG_MAIN, "DANE attempt failed;"
+ " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
+ host->name, host->address);
+ dane = FALSE;
+ goto tls_negotiate;
+ }
+ }
+ else
+# endif
+ if ( ob->tls_tempfail_tryclear
+ && !smtps
+ && verify_check_given_host(&ob->hosts_require_tls, host) != OK
+ )
+ {
+ log_write(0, LOG_MAIN, "TLS session failure:"
+ " delivering unencrypted to %s [%s] (not in hosts_require_tls)",
+ host->name, host->address);
+ suppress_tls = TRUE;
+ goto tls_retry_connection;
+ }
+ }
+
+ /*save_errno = ERRNO_TLSFAILURE;*/
+ /*message = US"failure while setting up TLS session";*/
+ send_quit = FALSE;
+ done= FALSE;
+ goto TLS_FAILED;
+ }
+
+ /* TLS session is set up. Copy info for logging. */
+ addr->cipher = tls_out.cipher;
+ addr->peerdn = tls_out.peerdn;
+
+ /* For SMTPS we need to wait for the initial OK response, then do HELO. */
+ if (smtps)
+ goto smtps_redo_greeting;
+
+ /* For STARTTLS we need to redo EHLO */
+ goto tls_redo_helo;
+ }
+ }
- else if (errno == 0)
+ /* If the host is required to use a secure channel, ensure that we have one. */
+ if (tls_out.active < 0)
+ if (
+# ifdef EXPERIMENTAL_DANE
+ dane ||
+# endif
+ verify_check_given_host(&ob->hosts_require_tls, host) == OK
+ )
{
- if (randombuffer[0] == '5')
- new_domain_record.random_result = ccache_reject;
+ /*save_errno = ERRNO_TLSREQUIRED;*/
+ log_write(0, LOG_MAIN,
+ "H=%s [%s]: a TLS session is required for this host, but %s",
+ host->name, host->address,
+ tls_offered ? "an attempt to start TLS failed"
+ : "the server did not offer TLS support");
+ done= FALSE;
+ goto TLS_FAILED;
+ }
- done =
- smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+#endif /*SUPPORT_TLS*/
- smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n",
- from_address) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
+ done = TRUE; /* so far so good; have response to HELO */
+
+ /*XXX the EHLO response would be analyzed here for IGNOREQUOTA, SIZE, PIPELINING */
+
+ /* For now, transport_filter by cutthrough-delivery is not supported */
+ /* Need proper integration with the proper transport mechanism. */
+ if (cutthrough.delivery)
+ {
+ if (addr->transport->filter_command)
+ {
+ cutthrough.delivery = FALSE;
+ HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of transport filter\n");
}
- else done = FALSE; /* Some timeout/connection problem */
- } /* Random check */
+#ifndef DISABLE_DKIM
+ if (ob->dkim_domain)
+ {
+ cutthrough.delivery = FALSE;
+ HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
+ }
+#endif
+ }
+
+ SEND_FAILED:
+ RESPONSE_FAILED:
+ TLS_FAILED:
+ ;
+ /* Clear down of the TLS, SMTP and TCP layers on error is handled below. */
- /* If the host is accepting all local parts, as determined by the "random"
- check, we don't need to waste time doing any further checking. */
+ /* Failure to accept HELO is cached; this blocks the whole domain for all
+ senders. I/O errors and defer responses are not cached. */
- if (new_domain_record.random_result != ccache_accept && done)
+ if (!done)
{
- /* Get the rcpt_include_affixes flag from the transport if there is one,
- but assume FALSE if there is not. */
-
- done =
- smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
- transport_rcpt_address(addr,
- (addr->transport == NULL)? FALSE :
- addr->transport->rcpt_include_affixes)) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
-
- if (done)
- new_address_record.result = ccache_accept;
- else if (errno == 0 && responsebuffer[0] == '5')
+ *failure_ptr = US"mail"; /* At or before MAIL */
+ if (errno == 0 && responsebuffer[0] == '5')
{
- *failure_ptr = US"recipient";
- new_address_record.result = ccache_reject;
+ setflag(addr, af_verify_nsfail);
+ new_domain_record.result = ccache_reject;
}
+ }
+
+ /* If we haven't authenticated, but are required to, give up. */
+ /* Try to AUTH */
+
+ else done = smtp_auth(responsebuffer, sizeof(responsebuffer),
+ addr, host, ob, esmtp, &inblock, &outblock) == OK &&
+
+ /* Copy AUTH info for logging */
+ ( (addr->authenticator = client_authenticator),
+ (addr->auth_id = client_authenticated_id),
+
+ /* Build a mail-AUTH string (re-using responsebuffer for convenience */
+ !smtp_mail_auth_str(responsebuffer, sizeof(responsebuffer), addr, ob)
+ ) &&
+
+ ( (addr->auth_sndr = client_authenticated_sender),
+
+ /* Send the MAIL command */
+ (smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>%s\r\n",
+ from_address, responsebuffer) >= 0)
+ ) &&
+
+ smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
+ '2', callout);
+
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
- /* Do postmaster check if requested; if a full check is required, we
- check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
+ /* If the host does not accept MAIL FROM:<>, arrange to cache this
+ information, but again, don't record anything for an I/O error or a defer. Do
+ not cache rejections of MAIL when a non-empty sender has been used, because
+ that blocks the whole domain for all senders. */
- if (done && pm_mailfrom != NULL)
+ if (!done)
+ {
+ *failure_ptr = US"mail"; /* At or before MAIL */
+ if (errno == 0 && responsebuffer[0] == '5')
{
- done =
- smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout) &&
+ setflag(addr, af_verify_nsfail);
+ if (from_address[0] == 0)
+ new_domain_record.result = ccache_reject_mfnull;
+ }
+ }
- smtp_write_command(&outblock, FALSE,
- "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout) &&
+ /* Otherwise, proceed to check a "random" address (if required), then the
+ given address, and the postmaster address (if required). Between each check,
+ issue RSET, because some servers accept only one recipient after MAIL
+ FROM:<>.
+
+ Before doing this, set the result in the domain cache record to "accept",
+ unless its previous value was ccache_reject_mfnull. In that case, the domain
+ rejects MAIL FROM:<> and we want to continue to remember that. When that is
+ the case, we have got here only in the case of a recipient verification with
+ a non-null sender. */
- /* First try using the current domain */
+ else
+ {
+ new_domain_record.result =
+ (old_domain_cache_result == ccache_reject_mfnull)?
+ ccache_reject_mfnull: ccache_accept;
- ((
+ /* Do the random local part check first */
+
+ if (random_local_part != NULL)
+ {
+ uschar randombuffer[1024];
+ BOOL random_ok =
smtp_write_command(&outblock, FALSE,
- "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout)
- )
+ "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part,
+ addr->domain) >= 0 &&
+ smtp_read_response(&inblock, randombuffer,
+ sizeof(randombuffer), '2', callout);
- ||
+ /* Remember when we last did a random test */
- /* If that doesn't work, and a full check is requested,
- try without the domain. */
+ new_domain_record.random_stamp = time(NULL);
- (
- (options & vopt_callout_fullpm) != 0 &&
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<postmaster>\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout)
- ));
+ /* If accepted, we aren't going to do any further tests below. */
+
+ if (random_ok)
+ new_domain_record.random_result = ccache_accept;
+
+ /* Otherwise, cache a real negative response, and get back to the right
+ state to send RCPT. Unless there's some problem such as a dropped
+ connection, we expect to succeed, because the commands succeeded above. */
+
+ else if (errno == 0)
+ {
+ cancel_cutthrough_connection("random-recipient");
+
+ if (randombuffer[0] == '5')
+ new_domain_record.random_result = ccache_reject;
- /* Sort out the cache record */
+ done =
+ smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
+ smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
+ '2', callout) &&
- new_domain_record.postmaster_stamp = time(NULL);
+ smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n",
+ from_address) >= 0 &&
+ smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
+ '2', callout);
+ }
+ else done = FALSE; /* Some timeout/connection problem */
+ } /* Random check */
+
+ /* If the host is accepting all local parts, as determined by the "random"
+ check, we don't need to waste time doing any further checking. */
+
+ if (new_domain_record.random_result != ccache_accept && done)
+ {
+ /* Get the rcpt_include_affixes flag from the transport if there is one,
+ but assume FALSE if there is not. */
+
+ done =
+ smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
+ transport_rcpt_address(addr,
+ (addr->transport == NULL)? FALSE :
+ addr->transport->rcpt_include_affixes)) >= 0 &&
+ smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
+ '2', callout);
if (done)
- new_domain_record.postmaster_result = ccache_accept;
+ new_address_record.result = ccache_accept;
else if (errno == 0 && responsebuffer[0] == '5')
{
- *failure_ptr = US"postmaster";
- setflag(addr, af_verify_pmfail);
- new_domain_record.postmaster_result = ccache_reject;
+ *failure_ptr = US"recipient";
+ new_address_record.result = ccache_reject;
}
- }
- } /* Random not accepted */
- } /* MAIL FROM: accepted */
- /* For any failure of the main check, other than a negative response, we just
- close the connection and carry on. We can identify a negative response by the
- fact that errno is zero. For I/O errors it will be non-zero
+ /* Do postmaster check if requested; if a full check is required, we
+ check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
- Set up different error texts for logging and for sending back to the caller
- as an SMTP response. Log in all cases, using a one-line format. For sender
- callouts, give a full response to the caller, but for recipient callouts,
- don't give the IP address because this may be an internal host whose identity
- is not to be widely broadcast. */
+ if (done && pm_mailfrom != NULL)
+ {
+ /*XXX not suitable for cutthrough - we cannot afford to do an RSET
+ and lose the original mail-from */
+ cancel_cutthrough_connection("postmaster verify");
+ HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of postmaster verify\n");
+
+ done =
+ smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
+ smtp_read_response(&inblock, responsebuffer,
+ sizeof(responsebuffer), '2', callout) &&
+
+ smtp_write_command(&outblock, FALSE,
+ "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 &&
+ smtp_read_response(&inblock, responsebuffer,
+ sizeof(responsebuffer), '2', callout) &&
+
+ /* First try using the current domain */
+
+ ((
+ smtp_write_command(&outblock, FALSE,
+ "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 &&
+ smtp_read_response(&inblock, responsebuffer,
+ sizeof(responsebuffer), '2', callout)
+ )
+
+ ||
+
+ /* If that doesn't work, and a full check is requested,
+ try without the domain. */
+
+ (
+ (options & vopt_callout_fullpm) != 0 &&
+ smtp_write_command(&outblock, FALSE,
+ "RCPT TO:<postmaster>\r\n") >= 0 &&
+ smtp_read_response(&inblock, responsebuffer,
+ sizeof(responsebuffer), '2', callout)
+ ));
+
+ /* Sort out the cache record */
+
+ new_domain_record.postmaster_stamp = time(NULL);
+
+ if (done)
+ new_domain_record.postmaster_result = ccache_accept;
+ else if (errno == 0 && responsebuffer[0] == '5')
+ {
+ *failure_ptr = US"postmaster";
+ setflag(addr, af_verify_pmfail);
+ new_domain_record.postmaster_result = ccache_reject;
+ }
+ }
+ } /* Random not accepted */
+ } /* MAIL FROM: accepted */
- if (!done)
- {
- if (errno == ETIMEDOUT)
- {
- HDEBUG(D_verify) debug_printf("SMTP timeout\n");
- send_quit = FALSE;
- }
- else if (errno == 0)
+ /* For any failure of the main check, other than a negative response, we just
+ close the connection and carry on. We can identify a negative response by the
+ fact that errno is zero. For I/O errors it will be non-zero
+
+ Set up different error texts for logging and for sending back to the caller
+ as an SMTP response. Log in all cases, using a one-line format. For sender
+ callouts, give a full response to the caller, but for recipient callouts,
+ don't give the IP address because this may be an internal host whose identity
+ is not to be widely broadcast. */
+
+ if (!done)
{
- if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped");
+ if (errno == ETIMEDOUT)
+ {
+ HDEBUG(D_verify) debug_printf("SMTP timeout\n");
+ send_quit = FALSE;
+ }
+ else if (errno == 0)
+ {
+ if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped");
- addr->message =
- string_sprintf("response to \"%s\" from %s [%s] was: %s",
- big_buffer, host->name, host->address,
- string_printing(responsebuffer));
+ addr->message =
+ string_sprintf("response to \"%s\" from %s [%s] was: %s",
+ big_buffer, host->name, host->address,
+ string_printing(responsebuffer));
- addr->user_message = is_recipient?
- string_sprintf("Callout verification failed:\n%s", responsebuffer)
- :
- string_sprintf("Called: %s\nSent: %s\nResponse: %s",
- host->address, big_buffer, responsebuffer);
+ addr->user_message = is_recipient?
+ string_sprintf("Callout verification failed:\n%s", responsebuffer)
+ :
+ string_sprintf("Called: %s\nSent: %s\nResponse: %s",
+ host->address, big_buffer, responsebuffer);
- /* Hard rejection ends the process */
+ /* Hard rejection ends the process */
- if (responsebuffer[0] == '5') /* Address rejected */
- {
- yield = FAIL;
- done = TRUE;
+ if (responsebuffer[0] == '5') /* Address rejected */
+ {
+ yield = FAIL;
+ done = TRUE;
+ }
}
}
- }
- /* End the SMTP conversation and close the connection. */
+ /* End the SMTP conversation and close the connection. */
+
+ /* Cutthrough - on a successfull connect and recipient-verify with
+ use-sender and we are 1st rcpt and have no cutthrough conn so far
+ here is where we want to leave the conn open */
+ if ( cutthrough.delivery
+ && rcpt_count == 1
+ && done
+ && yield == OK
+ && (options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == vopt_callout_recipsender
+ && !random_local_part
+ && !pm_mailfrom
+ && cutthrough.fd < 0
+ && !lmtp
+ )
+ {
+ cutthrough.fd = outblock.sock; /* We assume no buffer in use in the outblock */
+ cutthrough.nrcpt = 1;
+ cutthrough.interface = interface;
+ cutthrough.host = *host;
+ cutthrough.addr = *addr; /* Save the address_item for later logging */
+ cutthrough.addr.next = NULL;
+ cutthrough.addr.host_used = &cutthrough.host;
+ if (addr->parent)
+ *(cutthrough.addr.parent = store_get(sizeof(address_item))) =
+ *addr->parent;
+ ctblock.buffer = ctbuffer;
+ ctblock.buffersize = sizeof(ctbuffer);
+ ctblock.ptr = ctbuffer;
+ /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */
+ ctblock.sock = cutthrough.fd;
+ }
+ else
+ {
+ /* Ensure no cutthrough on multiple address verifies */
+ if (options & vopt_callout_recipsender)
+ cancel_cutthrough_connection("multiple verify calls");
+ if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
+
+#ifdef SUPPORT_TLS
+ tls_close(FALSE, TRUE);
+#endif
+ (void)close(inblock.sock);
+#ifdef EXPERIMENTAL_EVENT
+ (void) event_raise(addr->transport->event_action,
+ US"tcp:close", NULL);
+#endif
+ }
- if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
- (void)close(inblock.sock);
- } /* Loop through all hosts, while !done */
+ } /* Loop through all hosts, while !done */
+ }
/* If we get here with done == TRUE, a successful callout happened, and yield
will be set OK or FAIL according to the response to the RCPT command.
+/* Called after recipient-acl to get a cutthrough connection open when
+ one was requested and a recipient-verify wasn't subsequently done.
+*/
+void
+open_cutthrough_connection( address_item * addr )
+{
+address_item addr2;
+
+/* Use a recipient-verify-callout to set up the cutthrough connection. */
+/* We must use a copy of the address for verification, because it might
+get rewritten. */
+
+addr2 = *addr;
+HDEBUG(D_acl) debug_printf("----------- %s cutthrough setup ------------\n",
+ rcpt_count > 1 ? "more" : "start");
+(void) verify_address(&addr2, NULL,
+ vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache,
+ CUTTHROUGH_CMD_TIMEOUT, -1, -1,
+ NULL, NULL, NULL);
+HDEBUG(D_acl) debug_printf("----------- end cutthrough setup ------------\n");
+return;
+}
+
+
+
+/* Send given number of bytes from the buffer */
+static BOOL
+cutthrough_send(int n)
+{
+if(cutthrough.fd < 0)
+ return TRUE;
+
+if(
+#ifdef SUPPORT_TLS
+ (tls_out.active == cutthrough.fd) ? tls_write(FALSE, ctblock.buffer, n) :
+#endif
+ send(cutthrough.fd, ctblock.buffer, n, 0) > 0
+ )
+{
+ transport_count += n;
+ ctblock.ptr= ctblock.buffer;
+ return TRUE;
+}
+
+HDEBUG(D_transport|D_acl) debug_printf("cutthrough_send failed: %s\n", strerror(errno));
+return FALSE;
+}
+
+
+
+static BOOL
+_cutthrough_puts(uschar * cp, int n)
+{
+while(n--)
+ {
+ if(ctblock.ptr >= ctblock.buffer+ctblock.buffersize)
+ if(!cutthrough_send(ctblock.buffersize))
+ return FALSE;
+
+ *ctblock.ptr++ = *cp++;
+ }
+return TRUE;
+}
+
+/* Buffered output of counted data block. Return boolean success */
+BOOL
+cutthrough_puts(uschar * cp, int n)
+{
+if (cutthrough.fd < 0) return TRUE;
+if (_cutthrough_puts(cp, n)) return TRUE;
+cancel_cutthrough_connection("transmit failed");
+return FALSE;
+}
+
+
+static BOOL
+_cutthrough_flush_send(void)
+{
+int n= ctblock.ptr-ctblock.buffer;
+
+if(n>0)
+ if(!cutthrough_send(n))
+ return FALSE;
+return TRUE;
+}
+
+
+/* Send out any bufferred output. Return boolean success. */
+BOOL
+cutthrough_flush_send(void)
+{
+if (_cutthrough_flush_send()) return TRUE;
+cancel_cutthrough_connection("transmit failed");
+return FALSE;
+}
+
+
+BOOL
+cutthrough_put_nl(void)
+{
+return cutthrough_puts(US"\r\n", 2);
+}
+
+
+/* Get and check response from cutthrough target */
+static uschar
+cutthrough_response(char expect, uschar ** copy)
+{
+smtp_inblock inblock;
+uschar inbuffer[4096];
+uschar responsebuffer[4096];
+
+inblock.buffer = inbuffer;
+inblock.buffersize = sizeof(inbuffer);
+inblock.ptr = inbuffer;
+inblock.ptrend = inbuffer;
+inblock.sock = cutthrough.fd;
+/* this relies on (inblock.sock == tls_out.active) */
+if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, CUTTHROUGH_DATA_TIMEOUT))
+ cancel_cutthrough_connection("target timeout on read");
+
+if(copy != NULL)
+ {
+ uschar * cp;
+ *copy = cp = string_copy(responsebuffer);
+ /* Trim the trailing end of line */
+ cp += Ustrlen(responsebuffer);
+ if(cp > *copy && cp[-1] == '\n') *--cp = '\0';
+ if(cp > *copy && cp[-1] == '\r') *--cp = '\0';
+ }
+
+return responsebuffer[0];
+}
+
+
+/* Negotiate dataphase with the cutthrough target, returning success boolean */
+BOOL
+cutthrough_predata(void)
+{
+if(cutthrough.fd < 0)
+ return FALSE;
+
+HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> DATA\n");
+cutthrough_puts(US"DATA\r\n", 6);
+cutthrough_flush_send();
+
+/* Assume nothing buffered. If it was it gets ignored. */
+return cutthrough_response('3', NULL) == '3';
+}
+
+
+/* fd and use_crlf args only to match write_chunk() */
+static BOOL
+cutthrough_write_chunk(int fd, uschar * s, int len, BOOL use_crlf)
+{
+uschar * s2;
+while(s && (s2 = Ustrchr(s, '\n')))
+ {
+ if(!cutthrough_puts(s, s2-s) || !cutthrough_put_nl())
+ return FALSE;
+ s = s2+1;
+ }
+return TRUE;
+}
+
+
+/* Buffered send of headers. Return success boolean. */
+/* Expands newlines to wire format (CR,NL). */
+/* Also sends header-terminating blank line. */
+BOOL
+cutthrough_headers_send(void)
+{
+if(cutthrough.fd < 0)
+ return FALSE;
+
+/* We share a routine with the mainline transport to handle header add/remove/rewrites,
+ but having a separate buffered-output function (for now)
+*/
+HDEBUG(D_acl) debug_printf("----------- start cutthrough headers send -----------\n");
+
+if (!transport_headers_send(&cutthrough.addr, cutthrough.fd,
+ cutthrough.addr.transport->add_headers,
+ cutthrough.addr.transport->remove_headers,
+ &cutthrough_write_chunk, TRUE,
+ cutthrough.addr.transport->rewrite_rules,
+ cutthrough.addr.transport->rewrite_existflags))
+ return FALSE;
+
+HDEBUG(D_acl) debug_printf("----------- done cutthrough headers send ------------\n");
+return TRUE;
+}
+
+
+static void
+close_cutthrough_connection(const char * why)
+{
+if(cutthrough.fd >= 0)
+ {
+ /* We could be sending this after a bunch of data, but that is ok as
+ the only way to cancel the transfer in dataphase is to drop the tcp
+ conn before the final dot.
+ */
+ ctblock.ptr = ctbuffer;
+ HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> QUIT\n");
+ _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */
+ _cutthrough_flush_send();
+ /* No wait for response */
+
+ #ifdef SUPPORT_TLS
+ tls_close(FALSE, TRUE);
+ #endif
+ (void)close(cutthrough.fd);
+ cutthrough.fd = -1;
+ HDEBUG(D_acl) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why);
+ }
+ctblock.ptr = ctbuffer;
+}
+
+void
+cancel_cutthrough_connection(const char * why)
+{
+close_cutthrough_connection(why);
+cutthrough.delivery = FALSE;
+}
+
+
+
+
+/* Have senders final-dot. Send one to cutthrough target, and grab the response.
+ Log an OK response as a transmission.
+ Close the connection.
+ Return smtp response-class digit.
+*/
+uschar *
+cutthrough_finaldot(void)
+{
+uschar res;
+address_item * addr;
+HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> .\n");
+
+/* Assume data finshed with new-line */
+if( !cutthrough_puts(US".", 1)
+ || !cutthrough_put_nl()
+ || !cutthrough_flush_send()
+ )
+ return cutthrough.addr.message;
+
+res = cutthrough_response('2', &cutthrough.addr.message);
+for (addr = &cutthrough.addr; addr; addr = addr->next)
+ {
+ addr->message = cutthrough.addr.message;
+ switch(res)
+ {
+ case '2':
+ delivery_log(LOG_MAIN, addr, (int)'>', NULL);
+ close_cutthrough_connection("delivered");
+ break;
+
+ case '4':
+ delivery_log(LOG_MAIN, addr, 0,
+ US"tmp-reject from cutthrough after DATA:");
+ break;
+
+ case '5':
+ delivery_log(LOG_MAIN|LOG_REJECT, addr, 0,
+ US"rejected after DATA:");
+ break;
+
+ default:
+ break;
+ }
+ }
+return cutthrough.addr.message;
+}
+
+
+
/*************************************************
* Copy error to toplevel address *
*************************************************/
if (address[0] == 0) return OK;
+/* Flip the legacy TLS-related variables over to the outbound set in case
+they're used in the context of a transport used by verification. Reset them
+at exit from this routine. */
+
+tls_modify_variables(&tls_out);
+
/* Save a copy of the sender address for re-instating if we change it to <>
while verifying a sender address (a nice bit of self-reference there). */
if (tf.hosts != NULL && (host_list == NULL || tf.hosts_override))
{
uschar *s;
- uschar *save_deliver_domain = deliver_domain;
+ const uschar *save_deliver_domain = deliver_domain;
uschar *save_deliver_localpart = deliver_localpart;
host_list = NULL; /* Ignore the router's hosts */
else
{
int flags;
- uschar *canonical_name;
host_item *host, *nexthost;
host_build_hostlist(&host_list, s, tf.hosts_randomize);
nexthost = host->next;
if (tf.gethostbyname ||
string_is_ip_address(host->name, NULL) != 0)
- (void)host_find_byname(host, NULL, flags, &canonical_name, TRUE);
+ (void)host_find_byname(host, NULL, flags, NULL, TRUE);
else
+ {
+ uschar * d_request = NULL, * d_require = NULL;
+ if (Ustrcmp(addr->transport->driver_name, "smtp") == 0)
+ {
+ smtp_transport_options_block * ob =
+ (smtp_transport_options_block *)
+ addr->transport->options_block;
+ d_request = ob->dnssec_request_domains;
+ d_require = ob->dnssec_require_domains;
+ }
+
(void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
- &canonical_name, NULL);
+ d_request, d_require, NULL, NULL);
+ }
}
}
}
}
else
{
+#ifdef SUPPORT_TLS
+ deliver_set_expansions(addr);
+#endif
+ verify_mode = is_recipient ? US"R" : US"S";
rc = do_callout(addr, host_list, &tf, callout, callout_overall,
callout_connect, options, se_mailfrom, pm_mailfrom);
+ verify_mode = NULL;
}
}
else
}
respond_printf(f, "%s\n", cr);
}
+ cancel_cutthrough_connection("routing hard fail");
- if (!full_info) return copy_error(vaddr, addr, FAIL);
- else yield = FAIL;
+ if (!full_info)
+ {
+ yield = copy_error(vaddr, addr, FAIL);
+ goto out;
+ }
+ else yield = FAIL;
}
/* Soft failure */
}
respond_printf(f, "%s\n", cr);
}
- if (!full_info) return copy_error(vaddr, addr, DEFER);
- else if (yield == OK) yield = DEFER;
+ cancel_cutthrough_connection("routing soft fail");
+
+ if (!full_info)
+ {
+ yield = copy_error(vaddr, addr, DEFER);
+ goto out;
+ }
+ else if (yield == OK) yield = DEFER;
}
/* If we are handling EXPN, we do not want to continue to route beyond
if (addr_new == NULL) ok_prefix = US"250 ";
respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
}
- return OK;
+ yield = OK;
+ goto out;
}
/* Successful routing other than EXPN. */
of $address_data to be that of the child */
vaddr->p.address_data = addr->p.address_data;
- return OK;
+ yield = OK;
+ goto out;
}
}
} /* Loop for generated addresses */
if (allok && addr_local == NULL && addr_remote == NULL)
{
fprintf(f, "mail to %s is discarded\n", address);
- return yield;
+ goto out;
}
for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
}
}
-/* Will be DEFER or FAIL if any one address has, only for full_info (which is
+/* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
the -bv or -bt case). */
+out:
+tls_modify_variables(&tls_in);
+
return yield;
}
verb = US"begins";
}
- *msgptr = string_printing(
+ /* deconst cast ok as we're passing a non-const to string_printing() */
+ *msgptr = US string_printing(
string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
errmess, tt - h->text, h->text, verb, len, s));
}
+/*************************************************
+* Check header names for 8-bit characters *
+*************************************************/
+
+/* This function checks for invalid charcters in header names. See
+RFC 5322, 2.2. and RFC 6532, 3.
+
+Arguments:
+ msgptr where to put an error message
+
+Returns: OK
+ FAIL
+*/
+
+int
+verify_check_header_names_ascii(uschar **msgptr)
+{
+header_line *h;
+uschar *colon, *s;
+
+for (h = header_list; h != NULL; h = h->next)
+ {
+ colon = Ustrchr(h->text, ':');
+ for(s = h->text; s < colon; s++)
+ {
+ if ((*s < 33) || (*s > 126))
+ {
+ *msgptr = string_sprintf("Invalid character in header \"%.*s\" found",
+ colon - h->text, h->text);
+ return FAIL;
+ }
+ }
+ }
+return OK;
+}
/*************************************************
* Check for blind recipients *
/* The rest of the line is the data we want. We turn it into printing
characters when we save it, so that it cannot mess up the format of any logging
or Received: lines into which it gets inserted. We keep a maximum of 127
-characters. */
+characters. The deconst cast is ok as we fed a nonconst to string_printing() */
-sender_ident = string_printing(string_copyn(p, 127));
+sender_ident = US string_printing(string_copyn(p, 127));
DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident);
END_OFF:
*/
int
-check_host(void *arg, uschar *ss, uschar **valueptr, uschar **error)
+check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error)
{
check_host_block *cb = (check_host_block *)arg;
int mlen = -1;
BOOL iplookup = FALSE;
BOOL isquery = FALSE;
BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0;
-uschar *t;
+const uschar *t;
uschar *semicolon;
uschar **aliases;
if ((semicolon = Ustrchr(ss, ';')) != NULL)
{
- uschar *affix;
+ const uschar *affix;
int partial, affixlen, starflags, id;
*semicolon = 0;
"+allow_unknown" was met earlier in the list, in which case OK is returned. */
int
-verify_check_this_host(uschar **listptr, unsigned int *cache_bits,
- uschar *host_name, uschar *host_address, uschar **valueptr)
+verify_check_this_host(const uschar **listptr, unsigned int *cache_bits,
+ const uschar *host_name, const uschar *host_address, const uschar **valueptr)
{
int rc;
unsigned int *local_cache_bits = cache_bits;
-uschar *save_host_address = deliver_host_address;
+const uschar *save_host_address = deliver_host_address;
check_host_block cb;
cb.host_name = host_name;
cb.host_address = host_address;
+/*************************************************
+* Check the given host item matches a list *
+*************************************************/
+int
+verify_check_given_host(uschar **listptr, host_item *host)
+{
+return verify_check_this_host(CUSS listptr, NULL, host->name, host->address, NULL);
+}
+
/*************************************************
* Check the remote host matches a list *
*************************************************/
int
verify_check_host(uschar **listptr)
{
-return verify_check_this_host(listptr, sender_host_cache, NULL,
+return verify_check_this_host(CUSS listptr, sender_host_cache, NULL,
(sender_host_address == NULL)? US"" : sender_host_address, NULL);
}
{
int ipsep = ',';
uschar ip[46];
- uschar *ptr = iplist;
+ const uschar *ptr = iplist;
uschar *res;
/* Handle exact matching */
*/
int
-verify_check_dnsbl(uschar **listptr)
+verify_check_dnsbl(const uschar **listptr)
{
int sep = 0;
int defer_return = FAIL;
-uschar *list = *listptr;
+const uschar *list = *listptr;
uschar *domain;
uschar *s;
uschar buffer[1024];
/* In case this is the first time the DNS resolver is being used. */
-dns_init(FALSE, FALSE);
+dns_init(FALSE, FALSE, FALSE); /*XXX dnssec? */
/* Loop through all the domains supplied, until something matches */
uschar keybuffer[256];
uschar keyrevadd[128];
- while ((keydomain = string_nextinlist(&key, &keysep, keybuffer,
+ while ((keydomain = string_nextinlist(CUSS &key, &keysep, keybuffer,
sizeof(keybuffer))) != NULL)
{
uschar *prepend = keydomain;
return FAIL;
}
+/* vi: aw ai sw=2
+*/
/* End of verify.c */
projects / exim.git / blobdiff