-/* $Cambridge: exim/src/src/verify.c,v 1.38 2006/09/05 13:24:10 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2006 */
+/* Copyright (c) University of Cambridge 1995 - 2015 */
/* 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 */
typedef struct dnsbl_cache_block {
+ time_t expiry;
dns_address *rhs;
uschar *text;
int rc;
static tree_node *dnsbl_cache = NULL;
+/* Bits for match_type in one_check_dnsbl() */
+
+#define MT_NOT 1
+#define MT_ALL 2
+
+static uschar cutthrough_response(char, uschar **);
+
/*************************************************
* Retrieve a callout cache record *
*/
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;
if (cache_record == NULL)
{
- HDEBUG(D_verify) debug_printf("callout cache: no %s record found\n", type);
+ HDEBUG(D_verify) debug_printf("callout cache: no %s record found for %s\n", type, key);
return NULL;
}
if (now - cache_record->time_stamp > expire)
{
- HDEBUG(D_verify) debug_printf("callout cache: %s record expired\n", type);
+ HDEBUG(D_verify) debug_printf("callout cache: %s record expired for %s\n", type, key);
return NULL;
}
cache_record->random_result = ccache_unknown;
}
-HDEBUG(D_verify) debug_printf("callout cache: found %s record\n", type);
+HDEBUG(D_verify) debug_printf("callout cache: found %s record for %s\n", type, key);
return cache_record;
}
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;
dbdata_callout_cache_address new_address_record;
host_item *host;
time_t callout_start_time;
+#ifdef EXPERIMENTAL_INTERNATIONAL
+BOOL utf8_offered = FALSE;
+#endif
new_domain_record.result = ccache_unknown;
new_domain_record.postmaster_result = ccache_unknown;
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");
}
-
-/* Default the connect and overall callout timeouts if not set, and record the
-time we are starting so that we can enforce it. */
-
-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. */
-
-for (host = host_list; host != NULL && !done; host = host->next)
+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_inblock inblock;
- smtp_outblock outblock;
- int host_af;
- int port = 25;
- BOOL send_quit = TRUE;
- 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)
+ smtp_transport_options_block *ob =
+ (smtp_transport_options_block *)addr->transport->options_block;
+
+ /* 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 (!(random_local_part = expand_string(callout_random_local_part)))
+ log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand "
+ "callout_random_local_part: %s", expand_string_message);
+
+ /* Default the connect and overall callout timeouts if not set, and record the
+ time we are starting so that we can enforce it. */
+
+ if (callout_overall < 0) callout_overall = 4 * callout;
+ if (callout_connect < 0) callout_connect = callout;
+ callout_start_time = time(NULL);
+
+ /* 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. */
+
+ 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, &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;
+ }
- deliver_host = deliver_host_address = NULL;
- deliver_domain = save_deliver_domain;
+ /* Set IPv4 or IPv6 */
- /* Set HELO string according to the protocol */
+ host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
- if (Ustrcmp(tf->protocol, "lmtp") == 0) helo = US"LHLO";
+ /* 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. */
- HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
+ deliver_host = host->name;
+ deliver_host_address = host->address;
+ deliver_host_port = host->port;
+ deliver_domain = addr->domain;
+ transport_name = addr->transport->name;
- /* Set up the buffer for reading SMTP response packets. */
+ if ( !smtp_get_interface(tf->interface, host_af, addr, &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);
- inblock.buffer = inbuffer;
- inblock.buffersize = sizeof(inbuffer);
- inblock.ptr = inbuffer;
- inblock.ptrend = inbuffer;
+ /* Set HELO string according to the protocol */
+ lmtp= Ustrcmp(tf->protocol, "lmtp") == 0;
+ smtps= Ustrcmp(tf->protocol, "smtps") == 0;
- /* Set up the buffer for holding SMTP commands while pipelining */
- outblock.buffer = outbuffer;
- outblock.buffersize = sizeof(outbuffer);
- outblock.ptr = outbuffer;
- outblock.cmd_count = 0;
- outblock.authenticating = FALSE;
+ HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
- /* 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. */
+ /* Set up the buffer for reading SMTP response packets. */
- 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));
- continue;
- }
+ inblock.buffer = inbuffer;
+ inblock.buffersize = sizeof(inbuffer);
+ inblock.ptr = inbuffer;
+ inblock.ptrend = inbuffer;
- /* 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. */
+ /* Set up the buffer for holding SMTP commands while pipelining */
- Ustrcpy(big_buffer, "initial connection");
+ outblock.buffer = outbuffer;
+ outblock.buffersize = sizeof(outbuffer);
+ outblock.ptr = outbuffer;
+ outblock.cmd_count = 0;
+ outblock.authenticating = FALSE;
- done =
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
- smtp_write_command(&outblock, FALSE, "%s %s\r\n", helo,
- smtp_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')
+ /* Reset the parameters of a TLS session */
+ tls_out.cipher = tls_out.peerdn = tls_out.peercert = NULL;
+
+ inblock.sock = outblock.sock =
+ smtp_connect(host, host_af, port, interface, callout_connect,
+ addr->transport);
+ 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 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
+ )
+ && (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*/
- /* 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
+
+ { esmtp_retry:
- /* Remember when we last did a random test */
+ 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");
+ }
+#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");
}
- else done = FALSE; /* Some timeout/connection problem */
- } /* Random check */
+#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;
}
+ }
+
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ else if ( addr->prop.utf8_msg
+ && !addr->prop.utf8_downcvt
+ && !( esmtp
+ && ( regex_UTF8
+ || ( (regex_UTF8 = regex_must_compile(
+ US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE)),
+ TRUE
+ ) )
+ && ( (utf8_offered = pcre_exec(regex_UTF8, NULL,
+ CS responsebuffer, Ustrlen(responsebuffer),
+ 0, PCRE_EOPT, NULL, 0) >= 0)
+ || addr->prop.utf8_downcvt_maybe
+ ) ) )
+ {
+ HDEBUG(D_acl|D_v) debug_printf("utf8 required but not offered\n");
+ errno = ERRNO_UTF8_FWD;
+ setflag(addr, af_verify_nsfail);
+ done = FALSE;
+ }
+ else if ( addr->prop.utf8_msg
+ && (addr->prop.utf8_downcvt || !utf8_offered)
+ && (setflag(addr, af_utf8_downcvt),
+ from_address = string_address_utf8_to_alabel(from_address,
+ &addr->message),
+ addr->message
+ ) )
+ {
+ errno = ERRNO_EXPANDFAIL;
+ setflag(addr, af_verify_nsfail);
+ done = FALSE;
+ }
+#endif
+
+ /* 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,
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ addr->prop.utf8_msg && !addr->prop.utf8_downcvt
+ ? "MAIL FROM:<%s>%s SMTPUTF8\r\n"
+ :
+#endif
+ "MAIL FROM:<%s>%s\r\n",
+ from_address, responsebuffer) >= 0)
+ ) &&
- /* Do postmaster check if requested; if a full check is required, we
- check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
+ smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
+ '2', callout);
- if (done && pm_mailfrom != NULL)
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
+
+ /* 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)
+ {
+ *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:<>.
- /* First try using the current domain */
+ 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. */
- ((
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout)
- )
+ else
+ {
+ const uschar * rcpt_domain = addr->domain;
+
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ uschar * errstr = NULL;
+ if ( testflag(addr, af_utf8_downcvt)
+ && (rcpt_domain = string_domain_utf8_to_alabel(rcpt_domain,
+ &errstr), errstr)
+ )
+ {
+ addr->message = errstr;
+ errno = ERRNO_EXPANDFAIL;
+ setflag(addr, af_verify_nsfail);
+ done = FALSE;
+ rcpt_domain = US""; /*XXX errorhandling! */
+ }
+#endif
- ||
+ new_domain_record.result =
+ (old_domain_cache_result == ccache_reject_mfnull)?
+ ccache_reject_mfnull: ccache_accept;
- /* If that doesn't work, and a full check is requested,
- try without the domain. */
+ /* Do the random local part check first */
- (
- (options & vopt_callout_fullpm) != 0 &&
+ if (random_local_part != NULL)
+ {
+ uschar randombuffer[1024];
+ BOOL random_ok =
smtp_write_command(&outblock, FALSE,
- "RCPT TO:<postmaster>\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout)
- ));
+ "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part,
+ rcpt_domain) >= 0 &&
+ smtp_read_response(&inblock, randombuffer,
+ sizeof(randombuffer), '2', callout);
+
+ /* Remember when we last did a random test */
- /* Sort out the cache record */
+ new_domain_record.random_stamp = time(NULL);
- new_domain_record.postmaster_stamp = time(NULL);
+ /* 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.
+ However, some servers drop the connection after responding to an
+ invalid recipient, so on (any) error we drop and remake the connection.
+ */
+
+ else if (errno == 0)
+ {
+ /* This would be ok for 1st rcpt a cutthrough, but no way to
+ handle a subsequent. So refuse to support any */
+ cancel_cutthrough_connection("random-recipient");
+
+ if (randombuffer[0] == '5')
+ new_domain_record.random_result = ccache_reject;
+
+ done =
+ smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
+ smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
+ '2', callout) &&
+
+ smtp_write_command(&outblock, FALSE,
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ addr->prop.utf8_msg && !addr->prop.utf8_downcvt
+ ? "MAIL FROM:<%s> SMTPUTF8\r\n"
+ :
+#endif
+ "MAIL FROM:<%s>\r\n",
+ from_address) >= 0 &&
+ smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
+ '2', callout);
+
+ if (!done)
+ {
+ HDEBUG(D_acl|D_v)
+ debug_printf("problem after random/rset/mfrom; reopen conn\n");
+ random_local_part = NULL;
+#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
+ goto tls_retry_connection;
+ }
+ }
+ 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. */
+
+ uschar * rcpt = transport_rcpt_address(addr,
+ addr->transport ? addr->transport->rcpt_include_affixes : FALSE);
+
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ /*XXX should the conversion be moved into transport_rcpt_address() ? */
+ uschar * dummy_errstr = NULL;
+ if ( testflag(addr, af_utf8_downcvt)
+ && (rcpt = string_address_utf8_to_alabel(rcpt, &dummy_errstr),
+ dummy_errstr
+ ) )
+ {
+ errno = ERRNO_EXPANDFAIL;
+ *failure_ptr = US"recipient";
+ done = FALSE;
+ }
+ else
+#endif
+
+ done =
+ smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
+ rcpt) >= 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)
+ {
+ /* Could possibly shift before main verify, just above, and be ok
+ for cutthrough. But no way to handle a subsequent rcpt, so just
+ refuse any */
+ 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", rcpt_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;
+ }
+#ifdef EXPERIMENTAL_INTERNATIONAL
+ else if (errno == ERRNO_UTF8_FWD)
+ {
+ extern int acl_where; /* src/acl.c */
+ errno = 0;
+ addr->message = string_sprintf(
+ "response to \"%s\" from %s [%s] did not include SMTPUTF8",
+ big_buffer, host->name, host->address);
+ addr->user_message = acl_where == ACL_WHERE_RCPT
+ ? US"533 mailbox name not allowed"
+ : US"550 mailbox unavailable";
+ yield = FAIL;
+ done = TRUE;
+ }
+#endif
+ 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 *
*************************************************/
vaddr->user_message = addr->user_message;
vaddr->basic_errno = addr->basic_errno;
vaddr->more_errno = addr->more_errno;
- vaddr->p.address_data = addr->p.address_data;
+ vaddr->prop.address_data = addr->prop.address_data;
+ copyflag(vaddr, addr, af_pass_message);
}
return yield;
}
+/**************************************************
+* printf that automatically handles TLS if needed *
+***************************************************/
+
+/* This function is used by verify_address() as a substitute for all fprintf()
+calls; a direct fprintf() will not produce output in a TLS SMTP session, such
+as a response to an EXPN command. smtp_in.c makes smtp_printf available but
+that assumes that we always use the smtp_out FILE* when not using TLS or the
+ssl buffer when we are. Instead we take a FILE* parameter and check to see if
+that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
+fprintf().
+
+Arguments:
+ f the candidate FILE* to write to
+ format format string
+ ... optional arguments
+
+Returns:
+ nothing
+*/
+
+static void PRINTF_FUNCTION(2,3)
+respond_printf(FILE *f, const char *format, ...)
+{
+va_list ap;
+
+va_start(ap, format);
+if (smtp_out && (f == smtp_out))
+ smtp_vprintf(format, ap);
+else
+ vfprintf(f, format, ap);
+va_end(ap);
+}
+
+
+
/*************************************************
* Verify an email address *
*************************************************/
if ((options & vopt_qualify) == 0)
{
if (f != NULL)
- fprintf(f, "%sA domain is required for \"%s\"%s\n", ko_prefix, address,
- cr);
+ respond_printf(f, "%sA domain is required for \"%s\"%s\n",
+ ko_prefix, address, cr);
*failure_ptr = US"qualify";
return FAIL;
}
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). */
/* Just in case some router parameter refers to it. */
- return_path = (addr->p.errors_address != NULL)?
- addr->p.errors_address : sender_address;
+ return_path = (addr->prop.errors_address != NULL)?
+ addr->prop.errors_address : sender_address;
/* Split the address into domain and local part, handling the %-hack if
necessary, and then route it. While routing a sender address, set
{
host_item *host_list = addr->host_list;
- /* Default, if no remote transport, to NULL for the interface (=> any),
- "smtp" for the port, and "smtp" for the protocol. */
-
- transport_feedback tf = { NULL, US"smtp", US"smtp", NULL, FALSE, FALSE };
+ /* Make up some data for use in the case where there is no remote
+ transport. */
+
+ transport_feedback tf = {
+ NULL, /* interface (=> any) */
+ US"smtp", /* port */
+ US"smtp", /* protocol */
+ NULL, /* hosts */
+ US"$smtp_active_hostname", /* helo_data */
+ FALSE, /* hosts_override */
+ FALSE, /* hosts_randomize */
+ FALSE, /* gethostbyname */
+ TRUE, /* qualify_single */
+ FALSE /* search_parents */
+ };
/* If verification yielded a remote transport, we want to use that
transport's options, so as to mimic what would happen if we were really
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
{
- uschar *canonical_name;
+ int flags;
host_item *host, *nexthost;
host_build_hostlist(&host_list, s, tf.hosts_randomize);
additional host items being inserted into the chain. Hence we must
save the next host first. */
+ flags = HOST_FIND_BY_A;
+ if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
+ if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
+
for (host = host_list; host != NULL; host = nexthost)
{
nexthost = host->next;
if (tf.gethostbyname ||
string_is_ip_address(host->name, NULL) != 0)
- (void)host_find_byname(host, NULL, &canonical_name, TRUE);
+ (void)host_find_byname(host, NULL, flags, NULL, TRUE);
else
- {
- int flags = HOST_FIND_BY_A;
- if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
- if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
+ {
+ dnssec_domains * dnssec_domains = NULL;
+ if (Ustrcmp(addr->transport->driver_name, "smtp") == 0)
+ {
+ smtp_transport_options_block * ob =
+ (smtp_transport_options_block *)
+ addr->transport->options_block;
+ dnssec_domains = &ob->dnssec;
+ }
+
(void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
- &canonical_name, NULL);
- }
+ dnssec_domains, 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
allok = FALSE;
if (f != NULL)
{
- fprintf(f, "%s%s %s", ko_prefix, address,
+ address_item *p = addr->parent;
+
+ respond_printf(f, "%s%s %s", ko_prefix,
+ full_info? addr->address : address,
address_test_mode? "is undeliverable" : "failed to verify");
if (!expn && admin_user)
{
if (addr->basic_errno > 0)
- fprintf(f, ": %s", strerror(addr->basic_errno));
+ respond_printf(f, ": %s", strerror(addr->basic_errno));
if (addr->message != NULL)
- fprintf(f, ":\n %s", addr->message);
+ respond_printf(f, ": %s", addr->message);
}
- fprintf(f, "%s\n", cr);
+
+ /* Show parents iff doing full info */
+
+ if (full_info) while (p != NULL)
+ {
+ respond_printf(f, "%s\n <-- %s", cr, p->address);
+ p = p->parent;
+ }
+ 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 */
allok = FALSE;
if (f != NULL)
{
- fprintf(f, "%s%s cannot be resolved at this time", ko_prefix, address);
+ address_item *p = addr->parent;
+ respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix,
+ full_info? addr->address : address);
if (!expn && admin_user)
{
if (addr->basic_errno > 0)
- fprintf(f, ":\n %s", strerror(addr->basic_errno));
+ respond_printf(f, ": %s", strerror(addr->basic_errno));
if (addr->message != NULL)
- fprintf(f, ":\n %s", addr->message);
+ respond_printf(f, ": %s", addr->message);
else if (addr->basic_errno <= 0)
- fprintf(f, ":\n unknown error");
+ respond_printf(f, ": unknown error");
+ }
+
+ /* Show parents iff doing full info */
+
+ if (full_info) while (p != NULL)
+ {
+ respond_printf(f, "%s\n <-- %s", cr, p->address);
+ p = p->parent;
}
+ respond_printf(f, "%s\n", cr);
+ }
+ cancel_cutthrough_connection("routing soft fail");
- fprintf(f, "%s\n", cr);
+ if (!full_info)
+ {
+ yield = copy_error(vaddr, addr, DEFER);
+ goto out;
}
- if (!full_info) return copy_error(vaddr, addr, DEFER);
- else if (yield == OK) yield = DEFER;
+ else if (yield == OK) yield = DEFER;
}
/* If we are handling EXPN, we do not want to continue to route beyond
- the top level. */
+ the top level (whose address is in "address"). */
else if (expn)
{
if (addr_new == NULL)
{
if (addr_local == NULL && addr_remote == NULL)
- fprintf(f, "250 mail to <%s> is discarded\r\n", address);
+ respond_printf(f, "250 mail to <%s> is discarded\r\n", address);
else
- fprintf(f, "250 <%s>\r\n", address);
+ respond_printf(f, "250 <%s>\r\n", address);
}
else while (addr_new != NULL)
{
address_item *addr2 = addr_new;
addr_new = addr2->next;
if (addr_new == NULL) ok_prefix = US"250 ";
- fprintf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
+ respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
}
- return OK;
+ yield = OK;
+ goto out;
}
/* Successful routing other than EXPN. */
/* If we have carried on to verify a child address, we want the value
of $address_data to be that of the child */
- vaddr->p.address_data = addr->p.address_data;
- return OK;
+ vaddr->prop.address_data = addr->prop.address_data;
+ 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++)
fprintf(f, "%s", CS addr->address);
#ifdef EXPERIMENTAL_SRS
- if(addr->p.srs_sender)
- fprintf(f, " [srs = %s]", addr->p.srs_sender);
+ if(addr->prop.srs_sender)
+ fprintf(f, " [srs = %s]", addr->prop.srs_sender);
#endif
/* If the address is a duplicate, show something about it. */
while (len++ < maxaddlen) fprintf(f," ");
if (h->mx >= 0) fprintf(f, "MX=%d", h->mx);
if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port);
+ if (running_in_test_harness)
+#ifndef DISABLE_DNSSEC
+ fprintf(f, " ad=%s", h->dnssec==DS_YES ? "yes" : "no");
+#else
+ fprintf(f, " ad=no");
+#endif
if (h->status == hstatus_unusable) fprintf(f, " ** unusable **");
fprintf(f, "\n");
}
}
}
-/* 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;
}
{
header_line *h;
uschar *colon, *s;
+int yield = OK;
-for (h = header_list; h != NULL; h = h->next)
+for (h = header_list; h != NULL && yield == OK; h = h->next)
{
if (h->type != htype_from &&
h->type != htype_reply_to &&
s = colon + 1;
while (isspace(*s)) s++;
- parse_allow_group = TRUE; /* Allow group syntax */
+ /* Loop for multiple addresses in the header, enabling group syntax. Note
+ that we have to reset this after the header has been scanned. */
- /* Loop for multiple addresses in the header */
+ parse_allow_group = TRUE;
while (*s != 0)
{
int start, end, domain;
/* Temporarily terminate the string at this point, and extract the
- operative address within. */
+ operative address within, allowing group syntax. */
*ss = 0;
recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
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));
- return FAIL;
+ yield = FAIL;
+ break; /* Out of address loop */
}
/* Advance to the next address */
s = ss + (terminator? 1:0);
while (isspace(*s)) s++;
} /* Next address */
- } /* Next header */
-return OK;
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
+ } /* Next header unless yield has been set FALSE */
+
+return yield;
}
+/*************************************************
+* 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 *
s = colon + 1;
while (isspace(*s)) s++;
- parse_allow_group = TRUE; /* Allow group syntax */
+ /* Loop for multiple addresses in the header, enabling group syntax. Note
+ that we have to reset this after the header has been scanned. */
- /* Loop for multiple addresses in the header */
+ parse_allow_group = TRUE;
while (*s != 0)
{
int start, end, domain;
/* Temporarily terminate the string at this point, and extract the
- operative address within. */
+ operative address within, allowing group syntax. */
*ss = 0;
recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
s = ss + (terminator? 1:0);
while (isspace(*s)) s++;
} /* Next address */
+
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
} /* Next header (if found is false) */
if (!found) return FAIL;
uschar *pm_mailfrom, int options, int *verrno)
{
static int header_types[] = { htype_sender, htype_reply_to, htype_from };
+BOOL done = FALSE;
int yield = FAIL;
int i;
-for (i = 0; i < 3; i++)
+for (i = 0; i < 3 && !done; i++)
{
header_line *h;
- for (h = header_list; h != NULL; h = h->next)
+ for (h = header_list; h != NULL && !done; h = h->next)
{
int terminator, new_ok;
uschar *s, *ss, *endname;
if (h->type != header_types[i]) continue;
s = endname = Ustrchr(h->text, ':') + 1;
+ /* Scan the addresses in the header, enabling group syntax. Note that we
+ have to reset this after the header has been scanned. */
+
+ parse_allow_group = TRUE;
+
while (*s != 0)
{
address_item *vaddr;
else
{
int start, end, domain;
- uschar *address = parse_extract_address(s, log_msgptr, &start,
- &end, &domain, FALSE);
+ uschar *address = parse_extract_address(s, log_msgptr, &start, &end,
+ &domain, FALSE);
*ss = terminator;
+ /* If we found an empty address, just carry on with the next one, but
+ kill the message. */
+
+ if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0)
+ {
+ *log_msgptr = NULL;
+ s = ss;
+ continue;
+ }
+
/* If verification failed because of a syntax error, fail this
function, and ensure that the failing address gets added to the error
message. */
if (address == NULL)
{
new_ok = FAIL;
- if (*log_msgptr != NULL)
- {
- while (ss > s && isspace(ss[-1])) ss--;
- *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
- "scanning for sender: %s in \"%.*s\"",
- endname - h->text, h->text, *log_msgptr, ss - s, s);
- return FAIL;
- }
+ while (ss > s && isspace(ss[-1])) ss--;
+ *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
+ "scanning for sender: %s in \"%.*s\"",
+ endname - h->text, h->text, *log_msgptr, ss - s, s);
+ yield = FAIL;
+ done = TRUE;
+ break;
}
/* Else go ahead with the sender verification. But it isn't *the*
/* Success or defer */
- if (new_ok == OK) return OK;
+ if (new_ok == OK)
+ {
+ yield = OK;
+ done = TRUE;
+ break;
+ }
+
if (new_ok == DEFER) yield = DEFER;
/* Move on to any more addresses in the header */
s = ss;
- }
- }
- }
+ } /* Next address */
+
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
+ } /* Next header, unless done */
+ } /* Next header type unless done */
if (yield == FAIL && *log_msgptr == NULL)
*log_msgptr = US"there is no valid sender in any header line";
if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout)
< 0)
{
- if (errno == ETIMEDOUT && (log_extra_selector & LX_ident_timeout) != 0)
+ if (errno == ETIMEDOUT && LOGGING(ident_timeout))
{
log_write(0, LOG_MAIN, "ident connection to %s timed out",
sender_host_address);
/* 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;
name, we have to fish the file off the start of the query. For a single-key
lookup, the key is the current IP address, masked appropriately, and
reconverted to text form, with the mask appended. For IPv6 addresses, specify
- dot separators instead of colons. */
+ dot separators instead of colons, except when the lookup type is "iplsearch".
+ */
if (mac_islookup(search_type, lookup_absfilequery))
{
filename = NULL;
key = semicolon + 1;
}
- else
+ else /* Single-key style */
{
+ int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)?
+ ':' : '.';
insize = host_aton(cb->host_address, incoming);
host_mask(insize, incoming, mlen);
- (void)host_nmtoa(insize, incoming, mlen, buffer, '.');
+ (void)host_nmtoa(insize, incoming, mlen, buffer, sep);
key = buffer;
filename = semicolon + 1;
}
h.address = NULL;
h.mx = MX_NONE;
- rc = host_find_byname(&h, NULL, NULL, FALSE);
+ /* Using byname rather than bydns here means we cannot determine dnssec
+ status. On the other hand it is unclear how that could be either
+ propagated up or enforced. */
+
+ rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE);
if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
{
host_item *hh;
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);
}
/*************************************************
-* Invert an IP address for a DNS black list *
+* Invert an IP address *
*************************************************/
-/*
+/* Originally just used for DNS xBL lists, now also used for the
+reverse_ip expansion operator.
+
Arguments:
buffer where to put the answer
address the address to invert
*/
-static void
+void
invert_address(uschar *buffer, uschar *address)
{
int bin[4];
}
}
#endif
+
+/* Remove trailing period -- this is needed so that both arbitrary
+dnsbl keydomains and inverted addresses may be combined with the
+same format string, "%s.%s" */
+
+*(--bptr) = 0;
}
* Perform a single dnsbl lookup *
*************************************************/
-/* This function is called from verify_check_dnsbl() below.
+/* This function is called from verify_check_dnsbl() below. It is also called
+recursively from within itself when domain and domain_txt are different
+pointers, in order to get the TXT record from the alternate domain.
Arguments:
- domain the outer dnsbl domain (for debug message)
+ domain the outer dnsbl domain
+ domain_txt alternate domain to lookup TXT record on success; when the
+ same domain is to be used, domain_txt == domain (that is,
+ the pointers must be identical, not just the text)
keydomain the current keydomain (for debug message)
- query the domain to be looked up
- iplist the list of matching IP addresses
+ prepend subdomain to lookup (like keydomain, but
+ reversed if IP address)
+ iplist the list of matching IP addresses, or NULL for "any"
bitmask true if bitmask matching is wanted
- invert_result true if result to be inverted
+ match_type condition for 'succeed' result
+ 0 => Any RR in iplist (=)
+ 1 => No RR in iplist (!=)
+ 2 => All RRs in iplist (==)
+ 3 => Some RRs not in iplist (!==)
+ the two bits are defined as MT_NOT and MT_ALL
defer_return what to return for a defer
Returns: OK if lookup succeeded
*/
static int
-one_check_dnsbl(uschar *domain, uschar *keydomain, uschar *query,
- uschar *iplist, BOOL bitmask, BOOL invert_result, int defer_return)
+one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain,
+ uschar *prepend, uschar *iplist, BOOL bitmask, int match_type,
+ int defer_return)
{
dns_answer dnsa;
dns_scan dnss;
tree_node *t;
dnsbl_cache_block *cb;
int old_pool = store_pool;
+uschar query[256]; /* DNS domain max length */
+
+/* Construct the specific query domainname */
+
+if (!string_format(query, sizeof(query), "%s.%s", prepend, domain))
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
+ "(ignored): %s...", query);
+ return FAIL;
+ }
/* Look for this query in the cache. */
-t = tree_search(dnsbl_cache, query);
+if ( (t = tree_search(dnsbl_cache, query))
+ && (cb = t->data.ptr)->expiry > time(NULL)
+ )
+
+/* Previous lookup was cached */
+
+ {
+ HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
+ }
/* If not cached from a previous lookup, we must do a DNS lookup, and
cache the result in permanent memory. */
-if (t == NULL)
+else
{
+ uint ttl = 3600;
+
store_pool = POOL_PERM;
- /* Set up a tree entry to cache the lookup */
+ if (t)
+ {
+ HDEBUG(D_dnsbl) debug_printf("cached data found but past valid time; ");
+ }
- t = store_get(sizeof(tree_node) + Ustrlen(query));
- Ustrcpy(t->name, query);
- t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
- (void)tree_insertnode(&dnsbl_cache, t);
+ else
+ { /* Set up a tree entry to cache the lookup */
+ t = store_get(sizeof(tree_node) + Ustrlen(query));
+ Ustrcpy(t->name, query);
+ t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
+ (void)tree_insertnode(&dnsbl_cache, t);
+ }
/* Do the DNS loopup . */
Quite apart from one A6 RR generating multiple addresses, there are DNS
lists that return more than one A record, so we must handle multiple
- addresses generated in that way as well. */
+ addresses generated in that way as well.
+
+ Mark the cache entry with the "now" plus the minimum of the address TTLs,
+ or some suitably far-future time if none were found. */
if (cb->rc == DNS_SUCCEED)
{
dns_record *rr;
dns_address **addrp = &(cb->rhs);
for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
+ rr;
rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
{
if (rr->type == T_A)
{
dns_address *da = dns_address_from_rr(&dnsa, rr);
- if (da != NULL)
+ if (da)
{
*addrp = da;
while (da->next != NULL) da = da->next;
addrp = &(da->next);
+ if (ttl > rr->ttl) ttl = rr->ttl;
}
}
}
if (cb->rhs == NULL) cb->rc = DNS_NODATA;
}
+ cb->expiry = time(NULL)+ttl;
store_pool = old_pool;
}
-/* Previous lookup was cached */
-
-else
- {
- HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
- cb = t->data.ptr;
- }
-
/* We now have the result of the DNS lookup, either newly done, or cached
from a previous call. If the lookup succeeded, check against the address
list if there is one. This may be a positive equality list (introduced by
if (iplist != NULL)
{
- int ipsep = ',';
- uschar ip[46];
- uschar *ptr = iplist;
-
- while (string_nextinlist(&ptr, &ipsep, ip, sizeof(ip)) != NULL)
+ for (da = cb->rhs; da != NULL; da = da->next)
{
+ int ipsep = ',';
+ uschar ip[46];
+ const uschar *ptr = iplist;
+ uschar *res;
+
/* Handle exact matching */
+
if (!bitmask)
{
- for (da = cb->rhs; da != NULL; da = da->next)
+ while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
{
if (Ustrcmp(CS da->address, ip) == 0) break;
}
}
+
/* Handle bitmask matching */
+
else
{
int address[4];
ignore IPv6 addresses. The default mask is 0, which always matches.
We change this only for IPv4 addresses in the list. */
- if (host_aton(ip, address) == 1) mask = address[0];
+ if (host_aton(da->address, address) == 1) mask = address[0];
/* Scan the returned addresses, skipping any that are IPv6 */
- for (da = cb->rhs; da != NULL; da = da->next)
+ while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
{
- if (host_aton(da->address, address) != 1) continue;
- if ((address[0] & mask) == mask) break;
+ if (host_aton(ip, address) != 1) continue;
+ if ((address[0] & mask) == address[0]) break;
}
}
- /* Break out if a match has been found */
+ /* If either
- if (da != NULL) break;
+ (a) An IP address in an any ('=') list matched, or
+ (b) No IP address in an all ('==') list matched
+
+ then we're done searching. */
+
+ if (((match_type & MT_ALL) != 0) == (res == NULL)) break;
}
- /* If either
+ /* If da == NULL, either
- (a) No IP address in a positive list matched, or
- (b) An IP address in a negative list did match
+ (a) No IP address in an any ('=') list matched, or
+ (b) An IP address in an all ('==') list didn't match
- then behave as if the DNSBL lookup had not succeeded, i.e. the host is
- not on the list. */
+ so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on
+ the list. */
- if (invert_result != (da == NULL))
+ if ((match_type == MT_NOT || match_type == MT_ALL) != (da == NULL))
{
HDEBUG(D_dnsbl)
{
+ uschar *res = NULL;
+ switch(match_type)
+ {
+ case 0:
+ res = US"was no match";
+ break;
+ case MT_NOT:
+ res = US"was an exclude match";
+ break;
+ case MT_ALL:
+ res = US"was an IP address that did not match";
+ break;
+ case MT_NOT|MT_ALL:
+ res = US"were no IP addresses that did not match";
+ break;
+ }
debug_printf("=> but we are not accepting this block class because\n");
- debug_printf("=> there was %s match for %c%s\n",
- invert_result? "an exclude":"no", bitmask? '&' : '=', iplist);
+ debug_printf("=> there %s for %s%c%s\n",
+ res,
+ ((match_type & MT_ALL) == 0)? "" : "=",
+ bitmask? '&' : '=', iplist);
}
return FAIL;
}
}
- /* Either there was no IP list, or the record matched. Look up a TXT record
- if it hasn't previously been done. */
+ /* Either there was no IP list, or the record matched, implying that the
+ domain is on the list. We now want to find a corresponding TXT record. If an
+ alternate domain is specified for the TXT record, call this function
+ recursively to look that up; this has the side effect of re-checking that
+ there is indeed an A record at the alternate domain. */
+
+ if (domain_txt != domain)
+ return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL,
+ FALSE, match_type, defer_return);
+
+ /* If there is no alternate domain, look up a TXT record in the main domain
+ if it has not previously been cached. */
if (!cb->text_set)
{
If no key is given, what is looked up in the domain is the inverted IP address
of the current client host. If a key is given, it is used to construct the
-domain for the lookup. For example,
+domain for the lookup. For example:
dsn.rfc-ignorant.org/$sender_address_domain
value in $dnslist_text. We also cache everything in a tree, to optimize
multiple lookups.
+The TXT record is normally looked up in the same domain as the A record, but
+when many lists are combined in a single DNS domain, this will not be a very
+specific message. It is possible to specify a different domain for looking up
+TXT records; this is given before the main domain, comma-separated. For
+example:
+
+ dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \
+ socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3
+
+The caching ensures that only one lookup in dnsbl.sorbs.net is done.
+
Note: an address for testing RBL is 192.203.178.39
Note: an address for testing DUL is 192.203.178.4
Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org
*/
int
-verify_check_dnsbl(uschar **listptr)
+verify_check_dnsbl(const uschar **listptr)
{
int sep = 0;
int defer_return = FAIL;
-BOOL invert_result = FALSE;
-uschar *list = *listptr;
+const uschar *list = *listptr;
uschar *domain;
uschar *s;
uschar buffer[1024];
-uschar query[256]; /* DNS domain max length */
uschar revadd[128]; /* Long enough for IPv6 address */
/* Indicate that the inverted IP address is not yet set up */
/* 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 */
while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
{
int rc;
- BOOL frc;
BOOL bitmask = FALSE;
+ int match_type = 0;
+ uschar *domain_txt;
+ uschar *comma;
uschar *iplist;
uschar *key;
if (key != NULL) *key++ = 0;
/* See if there's a list of addresses supplied after the domain name. This is
- introduced by an = or a & character; if preceded by ! we invert the result.
- */
+ introduced by an = or a & character; if preceded by = we require all matches
+ and if preceded by ! we invert the result. */
iplist = Ustrchr(domain, '=');
if (iplist == NULL)
iplist = Ustrchr(domain, '&');
}
- if (iplist != NULL)
+ if (iplist != NULL) /* Found either = or & */
{
- if (iplist > domain && iplist[-1] == '!')
+ if (iplist > domain && iplist[-1] == '!') /* Handle preceding ! */
{
- invert_result = TRUE;
+ match_type |= MT_NOT;
iplist[-1] = 0;
}
- *iplist++ = 0;
+
+ *iplist++ = 0; /* Terminate domain, move on */
+
+ /* If we found = (bitmask == FALSE), check for == or =& */
+
+ if (!bitmask && (*iplist == '=' || *iplist == '&'))
+ {
+ bitmask = *iplist++ == '&';
+ match_type |= MT_ALL;
+ }
+ }
+
+ /* If there is a comma in the domain, it indicates that a second domain for
+ looking up TXT records is provided, before the main domain. Otherwise we must
+ set domain_txt == domain. */
+
+ domain_txt = domain;
+ comma = Ustrchr(domain, ',');
+ if (comma != NULL)
+ {
+ *comma++ = 0;
+ domain = comma;
}
/* Check that what we have left is a sensible domain name. There is no reason
for (s = domain; *s != 0; s++)
{
- if (!isalnum(*s) && *s != '-' && *s != '.')
+ if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_')
{
log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
"strange characters - is this right?", domain);
}
}
+ /* Check the alternate domain if present */
+
+ if (domain_txt != domain) for (s = domain_txt; *s != 0; s++)
+ {
+ if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_')
+ {
+ log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
+ "strange characters - is this right?", domain_txt);
+ break;
+ }
+ }
+
/* If there is no key string, construct the query by adding the domain name
onto the inverted host address, and perform a single DNS lookup. */
{
if (sender_host_address == NULL) return FAIL; /* can never match */
if (revadd[0] == 0) invert_address(revadd, sender_host_address);
- frc = string_format(query, sizeof(query), "%s%s", revadd, domain);
-
- if (!frc)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
- "(ignored): %s...", query);
- continue;
- }
-
- rc = one_check_dnsbl(domain, sender_host_address, query, iplist, bitmask,
- invert_result, defer_return);
-
+ rc = one_check_dnsbl(domain, domain_txt, sender_host_address, revadd,
+ iplist, bitmask, match_type, defer_return);
if (rc == OK)
{
- dnslist_domain = string_copy(domain);
+ dnslist_domain = string_copy(domain_txt);
+ dnslist_matched = string_copy(sender_host_address);
HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
- sender_host_address, domain);
+ sender_host_address, dnslist_domain);
}
-
if (rc != FAIL) return rc; /* OK or DEFER */
}
BOOL defer = FALSE;
uschar *keydomain;
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;
+
if (string_is_ip_address(keydomain, NULL) != 0)
{
- uschar keyrevadd[128];
invert_address(keyrevadd, keydomain);
- frc = string_format(query, sizeof(query), "%s%s", keyrevadd, domain);
- }
- else
- {
- frc = string_format(query, sizeof(query), "%s.%s", keydomain, domain);
- }
-
- if (!frc)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
- "(ignored): %s...", query);
- continue;
+ prepend = keyrevadd;
}
- rc = one_check_dnsbl(domain, keydomain, query, iplist, bitmask,
- invert_result, defer_return);
+ rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist,
+ bitmask, match_type, defer_return);
if (rc == OK)
{
- dnslist_domain = string_copy(domain);
+ dnslist_domain = string_copy(domain_txt);
+ dnslist_matched = string_copy(keydomain);
HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
- keydomain, domain);
+ keydomain, dnslist_domain);
return OK;
}
return FAIL;
}
+/* vi: aw ai sw=2
+*/
/* End of verify.c */
projects / exim.git / blobdiff