-/* $Cambridge: exim/src/src/verify.c,v 1.12 2005/01/12 15:41:27 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2005 */
+/* 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 */
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;
}
options the verification options - these bits are used:
vopt_is_recipient => this is a recipient address
vopt_callout_no_cache => don't use callout cache
+ vopt_callout_fullpm => if postmaster check, do full one
vopt_callout_random => do the "random" thing
vopt_callout_recipsender => use real sender for recipient
vopt_callout_recippmaster => use postmaster for recipient
static int
do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
- int callout, int callout_overall, int callout_connect, int options,
+ int callout, int callout_overall, int callout_connect, int options,
uschar *se_mailfrom, uschar *pm_mailfrom)
{
BOOL is_recipient = (options & vopt_is_recipient) != 0;
BOOL callout_random = (options & vopt_callout_random) != 0;
int yield = OK;
+int old_domain_cache_result = ccache_accept;
BOOL done = FALSE;
uschar *address_key;
uschar *from_address;
uschar *random_local_part = NULL;
-uschar **failure_ptr = is_recipient?
+const uschar *save_deliver_domain = deliver_domain;
+uschar **failure_ptr = is_recipient?
&recipient_verify_failure : &sender_verify_failure;
open_db dbblock;
open_db *dbm_file = NULL;
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);
if (cache_record != NULL)
{
- /* If an early command (up to and including MAIL FROM:<>) was rejected,
- there is no point carrying on. The callout fails. */
-
- if (cache_record->result == ccache_reject)
+ /* In most cases, if an early command (up to and including MAIL FROM:<>)
+ was rejected, there is no point carrying on. The callout fails. However, if
+ we are doing a recipient verification with use_sender or use_postmaster
+ set, a previous failure of MAIL FROM:<> doesn't count, because this time we
+ will be using a non-empty sender. We have to remember this situation so as
+ not to disturb the cached domain value if this whole verification succeeds
+ (we don't want it turning into "accept"). */
+
+ old_domain_cache_result = cache_record->result;
+
+ if (cache_record->result == ccache_reject ||
+ (*from_address == 0 && cache_record->result == ccache_reject_mfnull))
{
setflag(addr, af_verify_nsfail);
HDEBUG(D_verify)
setflag(addr, af_verify_nsfail);
addr->user_message = US"(result of an earlier callout reused).";
yield = FAIL;
- *failure_ptr = US"mail";
+ *failure_ptr = US"mail";
goto END_CALLOUT;
}
debug_printf("callout cache: domain does not accept "
"RCPT TO:<postmaster@domain>\n");
yield = FAIL;
- *failure_ptr = US"postmaster";
+ *failure_ptr = US"postmaster";
setflag(addr, af_verify_pmfail);
addr->user_message = US"(result of earlier verification reused).";
goto END_CALLOUT;
HDEBUG(D_verify)
debug_printf("callout cache: address record is negative\n");
addr->user_message = US"Previous (cached) callout verification failure";
- *failure_ptr = US"recipient";
+ *failure_ptr = US"recipient";
yield = FAIL;
}
goto END_CALLOUT;
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;
- 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, 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. 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;
- 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);
- deliver_host = deliver_host_address = NULL;
+ /* Check the overall callout timeout */
- /* Set HELO string according to the protocol */
+ if (time(NULL) - callout_start_time >= callout_overall)
+ {
+ HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
+ break;
+ }
- if (Ustrcmp(tf->protocol, "lmtp") == 0) helo = US"LHLO";
+ /* Set IPv4 or IPv6 */
- HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
+ host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
- /* Set up the buffer for reading SMTP response packets. */
+ /* 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. */
- inblock.buffer = inbuffer;
- inblock.buffersize = sizeof(inbuffer);
- inblock.ptr = inbuffer;
- inblock.ptrend = inbuffer;
+ 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 holding SMTP commands while pipelining */
+ 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);
- outblock.buffer = outbuffer;
- outblock.buffersize = sizeof(outbuffer);
- outblock.ptr = outbuffer;
- outblock.cmd_count = 0;
- outblock.authenticating = FALSE;
+ /* Set HELO string according to the protocol */
+ lmtp= Ustrcmp(tf->protocol, "lmtp") == 0;
+ smtps= Ustrcmp(tf->protocol, "smtps") == 0;
- /* 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. */
- 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;
- }
+ HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
- /* Wait for initial response, and then run the initial SMTP commands. 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 reading SMTP response packets. */
- Ustrcpy(big_buffer, "initial connection");
+ inblock.buffer = inbuffer;
+ inblock.buffersize = sizeof(inbuffer);
+ inblock.ptr = inbuffer;
+ inblock.ptrend = inbuffer;
- done =
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+ /* Set up the buffer for holding SMTP commands while pipelining */
- smtp_write_command(&outblock, FALSE, "%s %s\r\n", helo,
- smtp_active_hostname) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+ outblock.buffer = outbuffer;
+ outblock.buffersize = sizeof(outbuffer);
+ outblock.ptr = outbuffer;
+ outblock.cmd_count = 0;
+ outblock.authenticating = FALSE;
- smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n",
- from_address) >= 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. */
- /* If the host gave an initial error, or does not accept HELO or MAIL
- FROM:<>, arrange to cache this information, but don't record anything for an
- I/O error or a defer. Do not cache rejections when a non-empty sender has
- been used, because that blocks the whole domain for all senders. */
+ tls_retry_connection:
- if (!done)
- {
- *failure_ptr = US"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);
- if (from_address[0] == 0) 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;
}
- }
- /* 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:<>. */
+#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*/
- else
- {
- new_domain_record.result = ccache_accept;
+ /* Expand the helo_data string to find the host name to use. */
+
+ 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;
+ }
- /* Do the random local part check first */
+ /* 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. */
- if (random_local_part != NULL)
+ Ustrcpy(big_buffer, "initial connection");
+
+ /* Unless ssl-on-connect, wait for the initial greeting */
+ smtps_redo_greeting:
+
+#ifdef SUPPORT_TLS
+ if (!smtps || (smtps && tls_out.active >= 0))
+#endif
{
- 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);
+ 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
+ }
+
+ /* 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");
- /* Remember when we last did a random test */
+ tls_redo_helo:
- new_domain_record.random_stamp = time(NULL);
+#ifdef SUPPORT_TLS
+ if (smtps && tls_out.active < 0) /* ssl-on-connect, first pass */
+ {
+ tls_offered = TRUE;
+ ob->tls_tempfail_tryclear = FALSE;
+ }
+ else /* all other cases */
+#endif
- /* If accepted, we aren't going to do any further tests below. */
+ { esmtp_retry:
- if (random_ok)
+ 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))
{
- new_domain_record.random_result = ccache_accept;
+ 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 */
}
- /* 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. */
+ /* 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);
- else if (errno == 0)
+ tls_offered = pcre_exec(regex_STARTTLS, NULL, CS responsebuffer,
+ Ustrlen(responsebuffer), 0, PCRE_EOPT, NULL, 0) >= 0;
+ }
+ else
+ tls_offered = FALSE;
+#endif
+ }
+
+ /* 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))
{
- if (randombuffer[0] == '5')
- new_domain_record.random_result = ccache_reject;
+ if (errno != 0 || buffer2[0] == 0 ||
+ (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
+ {
+ Ustrncpy(responsebuffer, buffer2, sizeof(responsebuffer));
+ done= FALSE;
+ goto RESPONSE_FAILED;
+ }
+ }
- done =
- smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+ /* 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;
+ }
+ }
- smtp_write_command(&outblock, FALSE, "MAIL FROM:<>\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
+ /* 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
+ )
+ {
+ /*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;
}
- 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. */
+#endif /*SUPPORT_TLS*/
+
+ done = TRUE; /* so far so good; have response to HELO */
- if (new_domain_record.random_result != ccache_accept && done)
+ /*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)
{
- done =
- smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
- addr->address) >= 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')
+ 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)
{
- *failure_ptr = US"recipient";
- new_address_record.result = ccache_reject;
- }
+ cutthrough.delivery = FALSE;
+ HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
+ }
+#endif
+ }
- /* Do postmaster check if requested */
+ SEND_FAILED:
+ RESPONSE_FAILED:
+ TLS_FAILED:
+ ;
+ /* Clear down of the TLS, SMTP and TCP layers on error is handled below. */
- if (done && pm_mailfrom != NULL)
+ /* Failure to accept HELO is cached; this blocks the whole domain for all
+ senders. I/O errors and defer responses are not cached. */
+
+ 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);
+ new_domain_record.result = ccache_reject;
+ }
+ }
- smtp_write_command(&outblock, FALSE,
- "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout) &&
+#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)
+ ) &&
+
+ smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
+ '2', callout);
+
+ 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')
+ {
+ setflag(addr, af_verify_nsfail);
+ if (from_address[0] == 0)
+ new_domain_record.result = ccache_reject_mfnull;
+ }
+ }
+
+ /* 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. */
+
+ 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;
+
+ /* 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,
+ rcpt_domain) >= 0 &&
+ smtp_read_response(&inblock, randombuffer,
+ sizeof(randombuffer), '2', callout);
+
+ /* Remember when we last did a random test */
- new_domain_record.postmaster_stamp = time(NULL);
+ new_domain_record.random_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. */
+
+ 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 */
- 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. */
+ /* 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
- if (!done)
- {
- if (errno == ETIMEDOUT)
- {
- HDEBUG(D_verify) debug_printf("SMTP timeout\n");
- }
- else if (errno == 0)
+ 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
+ }
- (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
- 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.
However, there may be domain-specific information to cache in both cases.
The value of the result field in the new_domain record is ccache_unknown if
-there was an error before or with MAIL FROM:<>, and errno was not zero,
+there was an error before or with MAIL FROM:, and errno was not zero,
implying some kind of I/O error. We don't want to write the cache in that case.
-Otherwise the value is ccache_accept or ccache_reject. */
+Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
if (!callout_no_cache && new_domain_record.result != ccache_unknown)
{
+/* 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->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 *
*************************************************/
rewriting and messages from callouts
vopt_qualify => qualify an unqualified address; else error
vopt_expn => called from SMTP EXPN command
+ vopt_success_on_redirect => when a new address is generated
+ the verification instantly succeeds
These ones are used by do_callout() -- the options variable
is passed to it.
+ vopt_callout_fullpm => if postmaster check, do full one
vopt_callout_no_cache => don't use callout cache
vopt_callout_random => do the "random" thing
vopt_callout_recipsender => use real sender for recipient
for individual commands
callout_overall if > 0, gives overall timeout for the callout function;
if < 0, a default is used (see do_callout())
- callout_connect the connection timeout for callouts
+ callout_connect the connection timeout for callouts
se_mailfrom when callout is requested to verify a sender, use this
in MAIL FROM; NULL => ""
pm_mailfrom when callout is requested, if non-NULL, do the postmaster
int
verify_address(address_item *vaddr, FILE *f, int options, int callout,
- int callout_overall, int callout_connect, uschar *se_mailfrom,
+ int callout_overall, int callout_connect, uschar *se_mailfrom,
uschar *pm_mailfrom, BOOL *routed)
{
BOOL allok = TRUE;
BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0);
BOOL is_recipient = (options & vopt_is_recipient) != 0;
BOOL expn = (options & vopt_expn) != 0;
+BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0;
int i;
int yield = OK;
int verify_type = expn? v_expn :
address_item *addr_remote = NULL;
address_item *addr_local = NULL;
address_item *addr_succeed = NULL;
-uschar **failure_ptr = is_recipient?
+uschar **failure_ptr = is_recipient?
&recipient_verify_failure : &sender_verify_failure;
uschar *ko_prefix, *cr;
uschar *address = vaddr->address;
if ((options & vopt_qualify) == 0)
{
if (f != NULL)
- fprintf(f, "%sA domain is required for \"%s\"%s\n", ko_prefix, address,
- cr);
- *failure_ptr = US"qualify";
+ respond_printf(f, "%sA domain is required for \"%s\"%s\n",
+ ko_prefix, address, cr);
+ *failure_ptr = US"qualify";
return FAIL;
}
address = rewrite_address_qualify(address, is_recipient);
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 (addr->transport != NULL && !addr->transport->info->local)
{
- (void)(addr->transport->setup)(addr->transport, addr, &tf, NULL);
+ (void)(addr->transport->setup)(addr->transport, addr, &tf, 0, 0, NULL);
/* If the transport has hosts and the router does not, or if the
transport is configured to override the router's hosts, we must build a
if (tf.hosts != NULL && (host_list == NULL || tf.hosts_override))
{
uschar *s;
+ const uschar *save_deliver_domain = deliver_domain;
+ uschar *save_deliver_localpart = deliver_localpart;
host_list = NULL; /* Ignore the router's hosts */
deliver_domain = addr->domain;
deliver_localpart = addr->local_part;
s = expand_string(tf.hosts);
- deliver_domain = deliver_localpart = NULL;
+ deliver_domain = save_deliver_domain;
+ deliver_localpart = save_deliver_localpart;
if (s == NULL)
{
}
else
{
- uschar *canonical_name;
+ int flags;
host_item *host, *nexthost;
host_build_hostlist(&host_list, s, tf.hosts_randomize);
/* Just ignore failures to find a host address. If we don't manage
- to find any addresses, the callout will defer. Note that more than
- one address may be found for a single host, which will result in
- additional host items being inserted into the chain. Hence we must
+ to find any addresses, the callout will defer. Note that more than
+ one address may be found for a single host, which will result in
+ 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);
+ if (tf.gethostbyname ||
+ string_is_ip_address(host->name, NULL) != 0)
+ (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;
+ {
+ 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);
+ }
}
}
}
}
- /* Can only do a callout if we have at least one host! If the callout
+ /* Can only do a callout if we have at least one host! If the callout
fails, it will have set ${sender,recipient}_verify_failure. */
if (host_list != 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
}
}
}
-
+
/* Otherwise, any failure is a routing failure */
-
- else *failure_ptr = US"route";
+
+ else *failure_ptr = US"route";
/* A router may return REROUTED if it has set up a child address as a result
of a change of domain name (typically from widening). In this case we always
want to continue to verify the new child. */
if (rc == REROUTED) continue;
-
+
/* Handle hard failures */
if (rc == FAIL)
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");
}
- 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 soft fail");
+
+ 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. */
generated address. */
if (!full_info && /* Stop if short info wanted AND */
- (addr_new == NULL || /* No new address OR */
- addr_new->next != NULL || /* More than one new address OR */
- testflag(addr_new, af_pfr))) /* New address is pfr */
+ (((addr_new == NULL || /* No new address OR */
+ addr_new->next != NULL || /* More than one new address OR */
+ testflag(addr_new, af_pfr))) /* New address is pfr */
+ || /* OR */
+ (addr_new != NULL && /* At least one new address AND */
+ success_on_redirect))) /* success_on_redirect is set */
{
if (f != NULL) fprintf(f, "%s %s\n", address,
address_test_mode? "is deliverable" : "verified");
/* 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 */
discarded, usually because of the use of :blackhole: in an alias file. */
if (allok && addr_local == NULL && addr_remote == NULL)
+ {
fprintf(f, "mail to %s is discarded\n", address);
+ goto out;
+ }
-else for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
+for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
{
while (addr_list != NULL)
{
addr_list = addr->next;
fprintf(f, "%s", CS addr->address);
+#ifdef EXPERIMENTAL_SRS
+ if(addr->prop.srs_sender)
+ fprintf(f, " [srs = %s]", addr->prop.srs_sender);
+#endif
+
+ /* If the address is a duplicate, show something about it. */
+
+ if (!testflag(addr, af_pfr))
+ {
+ tree_node *tnode;
+ if ((tnode = tree_search(tree_duplicates, addr->unique)) != NULL)
+ fprintf(f, " [duplicate, would not be delivered]");
+ else tree_add_duplicate(addr->unique, addr);
+ }
+
+ /* Now show its parents */
+
while (p != NULL)
{
fprintf(f, "\n <-- %s", p->address);
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). */
-return yield;
+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);
{
uschar *verb = US"is";
uschar *t = ss;
+ uschar *tt = colon;
int len;
/* Arrange not to include any white space at the end in the
- error message. */
+ error message or the header name. */
while (t > s && isspace(t[-1])) t--;
+ while (tt > h->text && isspace(tt[-1])) tt--;
- /* Add the address which failed to the error message, since in a
+ /* Add the address that failed to the error message, since in a
header with very many addresses it is sometimes hard to spot
which one is at fault. However, limit the amount of address to
quote - cases have been seen where, for example, a missing double
verb = US"begins";
}
- *msgptr = string_printing(
- string_sprintf("%s: failing address in \"%.*s\" header %s: %.*s",
- errmess, colon - h->text, h->text, verb, len, s));
+ /* 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 */
+ 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 *
+*************************************************/
+
+/* This function checks that every (envelope) recipient is mentioned in either
+the To: or Cc: header lines, thus detecting blind carbon copies.
+
+There are two ways of scanning that could be used: either scan the header lines
+and tick off the recipients, or scan the recipients and check the header lines.
+The original proposed patch did the former, but I have chosen to do the latter,
+because (a) it requires no memory and (b) will use fewer resources when there
+are many addresses in To: and/or Cc: and only one or two envelope recipients.
+
+Arguments: none
+Returns: OK if there are no blind recipients
+ FAIL if there is at least one blind recipient
+*/
+
+int
+verify_check_notblind(void)
+{
+int i;
+for (i = 0; i < recipients_count; i++)
+ {
+ header_line *h;
+ BOOL found = FALSE;
+ uschar *address = recipients_list[i].address;
+
+ for (h = header_list; !found && h != NULL; h = h->next)
+ {
+ uschar *colon, *s;
+
+ if (h->type != htype_to && h->type != htype_cc) continue;
+
+ colon = Ustrchr(h->text, ':');
+ s = colon + 1;
+ while (isspace(*s)) s++;
+
+ /* Loop for multiple 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)
+ {
+ uschar *ss = parse_find_address_end(s, FALSE);
+ uschar *recipient,*errmess;
+ int terminator = *ss;
+ int start, end, domain;
+
+ /* Temporarily terminate the string at this point, and extract the
+ operative address within, allowing group syntax. */
+
+ *ss = 0;
+ recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
+ *ss = terminator;
+
+ /* If we found a valid recipient that has a domain, compare it with the
+ envelope recipient. Local parts are compared case-sensitively, domains
+ case-insensitively. By comparing from the start with length "domain", we
+ include the "@" at the end, which ensures that we are comparing the whole
+ local part of each address. */
+
+ if (recipient != NULL && domain != 0)
+ {
+ found = Ustrncmp(recipient, address, domain) == 0 &&
+ strcmpic(recipient + domain, address + domain) == 0;
+ if (found) break;
+ }
+
+ /* Advance to the next address */
+
+ 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;
+ } /* Next recipient */
+
+return OK;
+}
log_msgptr points to where to put a log error message
callout timeout for callout check (passed to verify_address())
callout_overall overall callout timeout (ditto)
- callout_connect connect callout timeout (ditto)
+ callout_connect connect callout timeout (ditto)
se_mailfrom mailfrom for verify; NULL => ""
pm_mailfrom sender for pm callout check (passed to verify_address())
options callout options (passed to verify_address())
+ verrno where to put the address basic_errno
If log_msgptr is set to something without setting user_msgptr, the caller
normally uses log_msgptr for both things.
int
verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr,
- int callout, int callout_overall, int callout_connect, uschar *se_mailfrom,
- uschar *pm_mailfrom, int options)
+ int callout, int callout_overall, int callout_connect, uschar *se_mailfrom,
+ 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*
{
vaddr = deliver_make_addr(address, FALSE);
new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender,
- callout, callout_overall, callout_connect, se_mailfrom,
+ callout, callout_overall, callout_connect, se_mailfrom,
pm_mailfrom, NULL);
}
}
last of these will be returned to the user if all three fail. We do not
set a log message - the generic one below will be used. */
- if (new_ok != OK && smtp_return_error_details)
+ if (new_ok != OK)
{
- *user_msgptr = string_sprintf("Rejected after DATA: "
- "could not verify \"%.*s\" header address\n%s: %s",
- endname - h->text, h->text, vaddr->address, vaddr->message);
+ *verrno = vaddr->basic_errno;
+ if (smtp_return_error_details)
+ {
+ *user_msgptr = string_sprintf("Rejected after DATA: "
+ "could not verify \"%.*s\" header address\n%s: %s",
+ endname - h->text, h->text, vaddr->address, vaddr->message);
+ }
}
/* 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";
/* 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:
-close(sock);
+(void)close(sock);
return;
}
error for error message when returning ERROR
The block contains:
- host_name the host name or NULL, implying use sender_host_name and
- sender_host_aliases, looking them up if required
+ host_name (a) the host name, or
+ (b) NULL, implying use sender_host_name and
+ sender_host_aliases, looking them up if required, or
+ (c) the empty string, meaning that only IP address matches
+ are permitted
host_address the host address
host_ipv4 the IPv4 address taken from an IPv6 one
Returns: OK matched
FAIL did not match
DEFER lookup deferred
- ERROR failed to find the host name or IP address
- unknown lookup type specified
+ ERROR (a) failed to find the host name or IP address, or
+ (b) unknown lookup type specified, or
+ (c) host name encountered when only IP addresses are
+ being matched
*/
-static int
-check_host(void *arg, uschar *ss, uschar **valueptr, uschar **error)
+int
+check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error)
{
check_host_block *cb = (check_host_block *)arg;
+int mlen = -1;
int maskoffset;
+BOOL iplookup = FALSE;
BOOL isquery = FALSE;
-uschar *semicolon, *t;
+BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0;
+const uschar *t;
+uschar *semicolon;
uschar **aliases;
/* Optimize for the special case when the pattern is "*". */
if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL;
if (*ss == 0) return FAIL;
-/* If the pattern is precisely "@" then match against the primary host name;
-if it's "@[]" match against the local host's IP addresses. */
+/* If the pattern is precisely "@" then match against the primary host name,
+provided that host name matching is permitted; if it's "@[]" match against the
+local host's IP addresses. */
if (*ss == '@')
{
- if (ss[1] == 0) ss = primary_hostname;
+ if (ss[1] == 0)
+ {
+ if (isiponly) return ERROR;
+ ss = primary_hostname;
+ }
else if (Ustrcmp(ss, "@[]") == 0)
{
ip_address_item *ip;
/* If the pattern is an IP address, optionally followed by a bitmask count, do
a (possibly masked) comparision with the current IP address. */
-if (string_is_ip_address(ss, &maskoffset) > 0)
+if (string_is_ip_address(ss, &maskoffset) != 0)
return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
-/* If the item is of the form net[n]-lookup;<file|query> then it is a lookup on
-a masked IP network, in textual form. The net- stuff really only applies to
-single-key lookups where the key is implicit. For query-style lookups the key
-is specified in the query. From release 4.30, the use of net- for query style
-is no longer needed, but we retain it for backward compatibility. */
-
-if (Ustrncmp(ss, "net", 3) == 0 && (semicolon = Ustrchr(ss, ';')) != NULL)
+/* The pattern is not an IP address. A common error that people make is to omit
+one component of an IPv4 address, either by accident, or believing that, for
+example, 1.2.3/24 is the same as 1.2.3.0/24, or 1.2.3 is the same as 1.2.3.0,
+which it isn't. (Those applications that do accept 1.2.3 as an IP address
+interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an
+ancient specification.) To aid in debugging these cases, we give a specific
+error if the pattern contains only digits and dots or contains a slash preceded
+only by digits and dots (a slash at the start indicates a file name and of
+course slashes may be present in lookups, but not preceded only by digits and
+dots). */
+
+for (t = ss; isdigit(*t) || *t == '.'; t++);
+if (*t == 0 || (*t == '/' && t != ss))
{
- int mlen = 0;
- for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
- if (*t++ == '-')
- {
- int insize;
- int search_type;
- int incoming[4];
- void *handle;
- uschar *filename, *key, *result;
- uschar buffer[64];
+ *error = US"malformed IPv4 address or address mask";
+ return ERROR;
+ }
- /* If no mask was supplied, set a negative value */
+/* See if there is a semicolon in the pattern */
- if (mlen == 0 && t == ss+4) mlen = -1;
+semicolon = Ustrchr(ss, ';');
- /* Find the search type */
+/* If we are doing an IP address only match, then all lookups must be IP
+address lookups, even if there is no "net-". */
- search_type = search_findtype(t, semicolon - t);
+if (isiponly)
+ {
+ iplookup = semicolon != NULL;
+ }
- if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
- search_error_message);
+/* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
+a lookup on a masked IP network, in textual form. We obey this code even if we
+have already set iplookup, so as to skip over the "net-" prefix and to set the
+mask length. The net- stuff really only applies to single-key lookups where the
+key is implicit. For query-style lookups the key is specified in the query.
+From release 4.30, the use of net- for query style is no longer needed, but we
+retain it for backward compatibility. */
- /* Adjust parameters for the type of lookup. For a query-style
- lookup, there is no file name, and the "key" is just 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. */
+if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL)
+ {
+ mlen = 0;
+ for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
+ if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */
+ iplookup = (*t++ == '-');
+ }
+else t = ss;
- if (mac_islookup(search_type, lookup_querystyle))
- {
- filename = NULL;
- key = semicolon + 1;
- }
- else
- {
- insize = host_aton(cb->host_address, incoming);
- host_mask(insize, incoming, mlen);
- (void)host_nmtoa(insize, incoming, mlen, buffer, '.');
- key = buffer;
- filename = semicolon + 1;
- }
+/* Do the IP address lookup if that is indeed what we have */
- /* Now do the actual lookup; note that there is no search_close() because
- of the caching arrangements. */
+if (iplookup)
+ {
+ int insize;
+ int search_type;
+ int incoming[4];
+ void *handle;
+ uschar *filename, *key, *result;
+ uschar buffer[64];
+
+ /* Find the search type */
+
+ search_type = search_findtype(t, semicolon - t);
+
+ if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
+ search_error_message);
+
+ /* Adjust parameters for the type of lookup. For a query-style lookup, there
+ is no file name, and the "key" is just the query. For query-style with a file
+ 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, except when the lookup type is "iplsearch".
+ */
- handle = search_open(filename, search_type, 0, NULL, NULL);
- if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
- search_error_message);
- result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
- if (valueptr != NULL) *valueptr = result;
- return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
+ if (mac_islookup(search_type, lookup_absfilequery))
+ {
+ filename = semicolon + 1;
+ key = filename;
+ while (*key != 0 && !isspace(*key)) key++;
+ filename = string_copyn(filename, key - filename);
+ while (isspace(*key)) key++;
+ }
+ else if (mac_islookup(search_type, lookup_querystyle))
+ {
+ filename = NULL;
+ key = semicolon + 1;
}
+ 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, sep);
+ key = buffer;
+ filename = semicolon + 1;
+ }
+
+ /* Now do the actual lookup; note that there is no search_close() because
+ of the caching arrangements. */
+
+ handle = search_open(filename, search_type, 0, NULL, NULL);
+ if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
+ search_error_message);
+ result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
+ if (valueptr != NULL) *valueptr = result;
+ return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
}
/* The pattern is not an IP address or network reference of any kind. That is,
-it is a host name pattern. Check the characters of the pattern to see if they
-comprise only letters, digits, full stops, and hyphens (the constituents of
-domain names). Allow underscores, as they are all too commonly found. Sigh.
-Also, if allow_utf8_domains is set, allow top-bit characters. */
+it is a host name pattern. If this is an IP only match, there's an error in the
+host list. */
+
+if (isiponly)
+ {
+ *error = US"cannot match host name in match_ip list";
+ return ERROR;
+ }
+
+/* Check the characters of the pattern to see if they comprise only letters,
+digits, full stops, and hyphens (the constituents of domain names). Allow
+underscores, as they are all too commonly found. Sigh. Also, if
+allow_utf8_domains is set, allow top-bit characters. */
for (t = ss; *t != 0; t++)
if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' &&
h.name = ss;
h.address = NULL;
h.mx = MX_NONE;
- rc = host_find_byname(&h, NULL, NULL, FALSE);
+
+ rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE);
if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
{
host_item *hh;
for (hh = &h; hh != NULL; hh = hh->next)
{
- if (Ustrcmp(hh->address, (Ustrchr(hh->address, ':') == NULL)?
- cb->host_ipv4 : cb->host_address) == 0)
- return OK;
+ if (host_is_in_net(hh->address, cb->host_address, 0)) return OK;
}
return FAIL;
}
if ((semicolon = Ustrchr(ss, ';')) != NULL)
{
- uschar *affix;
+ const uschar *affix;
int partial, affixlen, starflags, id;
*semicolon = 0;
search_error_message, ss);
return DEFER;
}
- isquery = mac_islookup(id, lookup_querystyle);
+ isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery);
}
if (isquery)
"+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;
cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)?
host_address + 7 : host_address;
-/* During the running of the check, put the IP address into $host_address. In
-the case of calls from the smtp transport, it will already be there. However,
-in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
+/* During the running of the check, put the IP address into $host_address. In
+the case of calls from the smtp transport, it will already be there. However,
+in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
the safe side, any existing setting is preserved, though as I write this
(November 2004) I can't see any cases where it is actually needed. */
check_host, /* function for testing */
&cb, /* argument for function */
MCL_HOST, /* type of check */
- (host_address == sender_host_address)?
+ (host_address == sender_host_address)?
US"host" : host_address, /* text for debugging */
valueptr); /* where to pass back data */
deliver_host_address = save_host_address;
-return rc;
+return rc;
}
+/*************************************************
+* 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)
- keydomain the current keydomain (for debug message)
- query the domain to be looked up
- iplist the list of matching IP addresses
- bitmask true if bitmask matching is wanted
- invert_result true if result to be inverted
- defer_return what to return for a defer
+ 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)
+ 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
+ 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
FAIL if not
*/
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. */
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
+
+ (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 (da != NULL) break;
+ 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;
+ 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);
}
}
- /* If there is no key string, construct the query by adding the domain name
+ /* 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 (key == NULL)
{
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);
- HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
- sender_host_address, 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, dnslist_domain);
}
-
if (rc != FAIL) return rc; /* OK or DEFER */
}
-
- /* If there is a key string, it can be a list of domains or IP addresses to
+
+ /* If there is a key string, it can be a list of domains or IP addresses to
be concatenated with the main domain. */
-
+
else
{
int keysep = 0;
- BOOL defer = FALSE;
- uschar *keydomain;
+ BOOL defer = FALSE;
+ uschar *keydomain;
uschar keybuffer[256];
-
- while ((keydomain = string_nextinlist(&key, &keysep, keybuffer,
+ uschar keyrevadd[128];
+
+ while ((keydomain = string_nextinlist(CUSS &key, &keysep, keybuffer,
sizeof(keybuffer))) != NULL)
- {
- if (string_is_ip_address(keydomain, NULL) > 0)
+ {
+ 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);
+ prepend = keyrevadd;
}
- if (!frc)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
- "(ignored): %s...", query);
- continue;
- }
-
- 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);
- HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
- keydomain, domain);
- return OK;
+ 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, dnslist_domain);
+ return OK;
}
-
+
/* If the lookup deferred, remember this fact. We keep trying the rest
of the list to see if we get a useful result, and if we don't, we return
DEFER at the end. */
} /* continue with next keystring domain/address */
if (defer) return DEFER;
- }
+ }
} /* continue with next dnsdb outer domain */
return FAIL;
}
+/* vi: aw ai sw=2
+*/
/* End of verify.c */
git://git.exim.org / users / heiko / exim.git / blobdiff