* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2016 */
+/* Copyright (c) University of Cambridge 1995 - 2017 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions concerned with verifying things. The original code for callout
#define MT_NOT 1
#define MT_ALL 2
-static uschar cutthrough_response(char, uschar **);
+static uschar cutthrough_response(char, uschar **, int);
+
/*************************************************
-/*************************************************
-* Do callout verification for an address *
-*************************************************/
-
-/* This function is called from verify_address() when the address has routed to
-a host list, and a callout has been requested. Callouts are expensive; that is
-why a cache is used to improve the efficiency.
-
-Arguments:
- addr the address that's been routed
- host_list the list of hosts to try
- tf the transport feedback block
+/* Check the callout cache.
+Options * pm_mailfrom may be modified by cache partial results.
- ifstring "interface" option from transport, or NULL
- portstring "port" option from transport, or NULL
- protocolstring "protocol" option from transport, or NULL
- callout the per-command callout timeout
- callout_overall the overall callout timeout (if < 0 use 4*callout)
- callout_connect the callout connection timeout (if < 0 use callout)
- 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
- se_mailfrom MAIL FROM address for sender verify; NULL => ""
- pm_mailfrom if non-NULL, do the postmaster check with this sender
-
-Returns: OK/FAIL/DEFER
+Return: TRUE if result found
*/
-static int
-do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
- int callout, int callout_overall, int callout_connect, int options,
- uschar *se_mailfrom, uschar *pm_mailfrom)
+static BOOL
+cached_callout_lookup(address_item * addr, uschar * address_key,
+ uschar * from_address, int * opt_ptr, uschar ** pm_ptr,
+ int * yield, uschar ** failure_ptr,
+ dbdata_callout_cache * new_domain_record, int * old_domain_res)
{
-int yield = OK;
-int old_domain_cache_result = ccache_accept;
-BOOL done = FALSE;
-uschar *address_key;
-uschar *from_address;
-uschar *random_local_part = NULL;
-const uschar *save_deliver_domain = deliver_domain;
-uschar **failure_ptr = options & vopt_is_recipient
- ? &recipient_verify_failure : &sender_verify_failure;
+int options = *opt_ptr;
open_db dbblock;
open_db *dbm_file = NULL;
-dbdata_callout_cache new_domain_record;
-dbdata_callout_cache_address new_address_record;
-host_item *host;
-time_t callout_start_time;
-uschar peer_offered = 0;
-
-new_domain_record.result = ccache_unknown;
-new_domain_record.postmaster_result = ccache_unknown;
-new_domain_record.random_result = ccache_unknown;
-
-memset(&new_address_record, 0, sizeof(new_address_record));
-
-/* For a recipient callout, the key used for the address cache record must
-include the sender address if we are using the real sender in the callout,
-because that may influence the result of the callout. */
-
-address_key = addr->address;
-from_address = US"";
-
-if (options & vopt_is_recipient)
- {
- if (options & vopt_callout_recipsender)
- {
- address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
- from_address = sender_address;
- if (cutthrough.delivery) options |= vopt_callout_no_cache;
- }
- else if (options & vopt_callout_recippmaster)
- {
- address_key = string_sprintf("%s/<postmaster@%s>", addr->address,
- qualify_domain_sender);
- from_address = string_sprintf("postmaster@%s", qualify_domain_sender);
- }
- }
-
-/* For a sender callout, we must adjust the key if the mailfrom address is not
-empty. */
-
-else
- {
- from_address = (se_mailfrom == NULL)? US"" : se_mailfrom;
- if (from_address[0] != 0)
- address_key = string_sprintf("%s/<%s>", addr->address, from_address);
- }
/* Open the callout cache database, it it exists, for reading only at this
stage, unless caching has been disabled. */
{
HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n");
}
-else if ((dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)) == NULL)
+else if (!(dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)))
{
HDEBUG(D_verify) debug_printf("callout cache: not available\n");
}
-
-/* If a cache database is available see if we can avoid the need to do an
-actual callout by making use of previously-obtained data. */
-
-if (dbm_file != NULL)
+else
{
- dbdata_callout_cache_address *cache_address_record;
- dbdata_callout_cache *cache_record = get_callout_cache_record(dbm_file,
- addr->domain, US"domain",
- callout_cache_domain_positive_expire,
- callout_cache_domain_negative_expire);
+ /* If a cache database is available see if we can avoid the need to do an
+ actual callout by making use of previously-obtained data. */
+
+ dbdata_callout_cache_address * cache_address_record;
+ dbdata_callout_cache * cache_record = get_callout_cache_record(dbm_file,
+ addr->domain, US"domain",
+ callout_cache_domain_positive_expire, callout_cache_domain_negative_expire);
/* If an unexpired cache record was found for this domain, see if the callout
process can be short-circuited. */
- if (cache_record != NULL)
+ if (cache_record)
{
/* 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
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;
+ *old_domain_res = cache_record->result;
- if (cache_record->result == ccache_reject ||
- (*from_address == 0 && cache_record->result == ccache_reject_mfnull))
+ if ( cache_record->result == ccache_reject
+ || *from_address == 0 && cache_record->result == ccache_reject_mfnull)
{
setflag(addr, af_verify_nsfail);
HDEBUG(D_verify)
- debug_printf("callout cache: domain gave initial rejection, or "
- "does not accept HELO or MAIL FROM:<>\n");
+ debug_printf("callout cache: domain gave initial rejection, or "
+ "does not accept HELO or MAIL FROM:<>\n");
setflag(addr, af_verify_nsfail);
addr->user_message = US"(result of an earlier callout reused).";
- yield = FAIL;
+ *yield = FAIL;
*failure_ptr = US"mail";
- goto END_CALLOUT;
+ dbfn_close(dbm_file);
+ return TRUE;
}
/* If a previous check on a "random" local part was accepted, we assume
case ccache_accept:
HDEBUG(D_verify)
debug_printf("callout cache: domain accepts random addresses\n");
- goto END_CALLOUT; /* Default yield is OK */
+ dbfn_close(dbm_file);
+ return TRUE; /* Default yield is OK */
case ccache_reject:
HDEBUG(D_verify)
debug_printf("callout cache: domain rejects random addresses\n");
- options &= ~vopt_callout_random;
- new_domain_record.random_result = ccache_reject;
- new_domain_record.random_stamp = cache_record->random_stamp;
+ *opt_ptr = options & ~vopt_callout_random;
+ new_domain_record->random_result = ccache_reject;
+ new_domain_record->random_stamp = cache_record->random_stamp;
break;
default:
HDEBUG(D_verify)
debug_printf("callout cache: need to check random address handling "
"(not cached or cache expired)\n");
- goto END_CACHE;
+ dbfn_close(dbm_file);
+ return FALSE;
}
/* If a postmaster check is requested, but there was a previous failure,
but has not been done before, we are going to have to do a callout, so skip
remaining cache processing. */
- if (pm_mailfrom != NULL)
+ if (*pm_ptr)
{
if (cache_record->postmaster_result == ccache_reject)
- {
- setflag(addr, af_verify_pmfail);
- HDEBUG(D_verify)
- debug_printf("callout cache: domain does not accept "
- "RCPT TO:<postmaster@domain>\n");
- yield = FAIL;
- *failure_ptr = US"postmaster";
- setflag(addr, af_verify_pmfail);
- addr->user_message = US"(result of earlier verification reused).";
- goto END_CALLOUT;
- }
+ {
+ setflag(addr, af_verify_pmfail);
+ HDEBUG(D_verify)
+ debug_printf("callout cache: domain does not accept "
+ "RCPT TO:<postmaster@domain>\n");
+ *yield = FAIL;
+ *failure_ptr = US"postmaster";
+ setflag(addr, af_verify_pmfail);
+ addr->user_message = US"(result of earlier verification reused).";
+ dbfn_close(dbm_file);
+ return TRUE;
+ }
if (cache_record->postmaster_result == ccache_unknown)
- {
- HDEBUG(D_verify)
- debug_printf("callout cache: need to check RCPT "
- "TO:<postmaster@domain> (not cached or cache expired)\n");
- goto END_CACHE;
- }
+ {
+ HDEBUG(D_verify)
+ debug_printf("callout cache: need to check RCPT "
+ "TO:<postmaster@domain> (not cached or cache expired)\n");
+ dbfn_close(dbm_file);
+ return FALSE;
+ }
/* If cache says OK, set pm_mailfrom NULL to prevent a redundant
postmaster check if the address itself has to be checked. Also ensure
*/
HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT "
-
"TO:<postmaster@domain>\n");
- pm_mailfrom = NULL;
- new_domain_record.postmaster_result = ccache_accept;
- new_domain_record.postmaster_stamp = cache_record->postmaster_stamp;
+ "TO:<postmaster@domain>\n");
+ *pm_ptr = NULL;
+ new_domain_record->postmaster_result = ccache_accept;
+ new_domain_record->postmaster_stamp = cache_record->postmaster_stamp;
}
}
sender address if we are doing a recipient callout with a non-empty sender).
*/
- cache_address_record = (dbdata_callout_cache_address *)
- get_callout_cache_record(dbm_file,
- address_key, US"address",
- callout_cache_positive_expire,
- callout_cache_negative_expire);
+ if (!(cache_address_record = (dbdata_callout_cache_address *)
+ get_callout_cache_record(dbm_file, address_key, US"address",
+ callout_cache_positive_expire, callout_cache_negative_expire)))
+ {
+ dbfn_close(dbm_file);
+ return FALSE;
+ }
- if (cache_address_record != NULL)
+ if (cache_address_record->result == ccache_accept)
{
- if (cache_address_record->result == ccache_accept)
- {
- HDEBUG(D_verify)
- debug_printf("callout cache: address record is positive\n");
- }
- else
- {
- 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";
- yield = FAIL;
- }
- goto END_CALLOUT;
+ HDEBUG(D_verify)
+ debug_printf("callout cache: address record is positive\n");
+ }
+ else
+ {
+ 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";
+ *yield = FAIL;
}
/* Close the cache database while we actually do the callout for real. */
- END_CACHE:
dbfn_close(dbm_file);
- dbm_file = NULL;
+ return TRUE;
}
+return FALSE;
+}
+
+
+/* Write results to callout cache
+*/
+static void
+cache_callout_write(dbdata_callout_cache * dom_rec, const uschar * domain,
+ int done, dbdata_callout_cache_address * addr_rec, uschar * address_key)
+{
+open_db dbblock;
+open_db *dbm_file = NULL;
+
+/* 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.
+Otherwise, we looped through the hosts but couldn't complete the business.
+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,
+implying some kind of I/O error. We don't want to write the cache in that case.
+Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
+
+if (dom_rec->result != ccache_unknown)
+ if (!(dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE)))
+ {
+ HDEBUG(D_verify) debug_printf("callout cache: not available\n");
+ }
+ else
+ {
+ (void)dbfn_write(dbm_file, domain, dom_rec,
+ (int)sizeof(dbdata_callout_cache));
+ HDEBUG(D_verify) debug_printf("wrote callout cache domain record for %s:\n"
+ " result=%d postmaster=%d random=%d\n",
+ domain,
+ dom_rec->result,
+ dom_rec->postmaster_result,
+ dom_rec->random_result);
+ }
+
+/* If a definite result was obtained for the callout, cache it unless caching
+is disabled. */
+
+if (done && addr_rec->result != ccache_unknown)
+ {
+ if (!dbm_file)
+ dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE);
+ if (!dbm_file)
+ {
+ HDEBUG(D_verify) debug_printf("no callout cache available\n");
+ }
+ else
+ {
+ (void)dbfn_write(dbm_file, address_key, addr_rec,
+ (int)sizeof(dbdata_callout_cache_address));
+ HDEBUG(D_verify) debug_printf("wrote %s callout cache address record for %s\n",
+ addr_rec->result == ccache_accept ? "positive" : "negative",
+ address_key);
+ }
+ }
+
+if (dbm_file) dbfn_close(dbm_file);
+}
+
+
+/* Cutthrough-multi. If the existing cached cutthrough connection matches
+the one we would make for a subsequent recipient, use it. Send the RCPT TO
+and check the result, nonpipelined as it may be wanted immediately for
+recipient-verification.
+
+It seems simpler to deal with this case separately from the main callout loop.
+We will need to remember it has sent, or not, so that rcpt-acl tail code
+can do it there for the non-rcpt-verify case. For this we keep an addresscount.
+
+Return: TRUE for a definitive result for the recipient
+*/
+static int
+cutthrough_multi(address_item * addr, host_item * host_list,
+ transport_feedback * tf, int * yield)
+{
+BOOL done = FALSE;
+host_item * host;
+
+if (addr->transport == cutthrough.addr.transport)
+ for (host = host_list; host; host = host->next)
+ if (Ustrcmp(host->address, cutthrough.host.address) == 0)
+ {
+ int host_af;
+ uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
+ int port = 25;
+
+ deliver_host = host->name;
+ deliver_host_address = host->address;
+ deliver_host_port = host->port;
+ deliver_domain = addr->domain;
+ transport_name = addr->transport->name;
+
+ host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
+
+ if (!smtp_get_interface(tf->interface, host_af, addr, &interface,
+ US"callout") ||
+ !smtp_get_port(tf->port, addr, &port, US"callout"))
+ log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
+ addr->message);
+
+ if ( ( interface == cutthrough.interface
+ || ( interface
+ && cutthrough.interface
+ && Ustrcmp(interface, cutthrough.interface) == 0
+ ) )
+ && port == cutthrough.host.port
+ )
+ {
+ uschar * resp = NULL;
+
+ /* Match! Send the RCPT TO, set done from the response */
+ done =
+ smtp_write_command(&ctblock, FALSE, "RCPT TO:<%.1000s>\r\n",
+ transport_rcpt_address(addr,
+ addr->transport->rcpt_include_affixes)) >= 0 &&
+ cutthrough_response('2', &resp, CUTTHROUGH_DATA_TIMEOUT) == '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 (!resp || 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\" was: %s",
+ big_buffer, 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; /* host_list */
+ }
+if (!done)
+ cancel_cutthrough_connection("incompatible connection");
+return done;
+}
+
+
+/*************************************************
+* Do callout verification for an address *
+*************************************************/
+
+/* This function is called from verify_address() when the address has routed to
+a host list, and a callout has been requested. Callouts are expensive; that is
+why a cache is used to improve the efficiency.
+
+Arguments:
+ addr the address that's been routed
+ host_list the list of hosts to try
+ tf the transport feedback block
+
+ ifstring "interface" option from transport, or NULL
+ portstring "port" option from transport, or NULL
+ protocolstring "protocol" option from transport, or NULL
+ callout the per-command callout timeout
+ callout_overall the overall callout timeout (if < 0 use 4*callout)
+ callout_connect the callout connection timeout (if < 0 use callout)
+ 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
+ se_mailfrom MAIL FROM address for sender verify; NULL => ""
+ pm_mailfrom if non-NULL, do the postmaster check with this sender
+
+Returns: OK/FAIL/DEFER
+*/
+
+static int
+do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
+ int callout, int callout_overall, int callout_connect, int options,
+ uschar *se_mailfrom, uschar *pm_mailfrom)
+{
+int yield = OK;
+int old_domain_cache_result = ccache_accept;
+BOOL done = FALSE;
+uschar *address_key;
+uschar *from_address;
+uschar *random_local_part = NULL;
+const uschar *save_deliver_domain = deliver_domain;
+uschar **failure_ptr = options & vopt_is_recipient
+ ? &recipient_verify_failure : &sender_verify_failure;
+dbdata_callout_cache new_domain_record;
+dbdata_callout_cache_address new_address_record;
+time_t callout_start_time;
+
+new_domain_record.result = ccache_unknown;
+new_domain_record.postmaster_result = ccache_unknown;
+new_domain_record.random_result = ccache_unknown;
+
+memset(&new_address_record, 0, sizeof(new_address_record));
+
+/* For a recipient callout, the key used for the address cache record must
+include the sender address if we are using the real sender in the callout,
+because that may influence the result of the callout. */
+
+if (options & vopt_is_recipient)
+ if (options & vopt_callout_recipsender)
+ {
+ from_address = sender_address;
+ address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
+ if (cutthrough.delivery) options |= vopt_callout_no_cache;
+ }
+ else if (options & vopt_callout_recippmaster)
+ {
+ from_address = string_sprintf("postmaster@%s", qualify_domain_sender);
+ address_key = string_sprintf("%s/<postmaster@%s>", addr->address,
+ qualify_domain_sender);
+ }
+ else
+ {
+ from_address = US"";
+ address_key = addr->address;
+ }
+
+/* For a sender callout, we must adjust the key if the mailfrom address is not
+empty. */
+
+else
+ {
+ from_address = se_mailfrom ? se_mailfrom : US"";
+ address_key = *from_address
+ ? string_sprintf("%s/<%s>", addr->address, from_address) : addr->address;
+ }
+
+if (cached_callout_lookup(addr, address_key, from_address,
+ &options, &pm_mailfrom, &yield, failure_ptr,
+ &new_domain_record, &old_domain_cache_result))
+ goto END_CALLOUT;
if (!addr->transport)
{
{
smtp_transport_options_block *ob =
(smtp_transport_options_block *)addr->transport->options_block;
+ host_item * host;
/* 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. */
+ log the fact, but carry on without randomising. */
- if (options & vopt_callout_random && callout_random_local_part != NULL)
+ if (options & vopt_callout_random && callout_random_local_part)
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);
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();
+ if (smtp_out && !disable_callout_flush) mac_smtp_fflush();
+
+ clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
+ clearflag(addr, af_verify_nsfail); /* null sender callout flag */
/* 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.
-*/
+coding means skipping this whole loop and doing the append separately. */
/* Can we re-use an open cutthrough connection? */
if ( cutthrough.fd >= 0
&& !random_local_part
&& !pm_mailfrom
)
- {
- if (addr->transport == cutthrough.addr.transport)
- for (host = host_list; host; host = host->next)
- if (Ustrcmp(host->address, cutthrough.host.address) == 0)
- {
- int host_af;
- uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
- int port = 25;
-
- deliver_host = host->name;
- deliver_host_address = host->address;
- deliver_host_port = host->port;
- deliver_domain = addr->domain;
- transport_name = addr->transport->name;
-
- host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
-
- if (!smtp_get_interface(tf->interface, host_af, addr, &interface,
- US"callout") ||
- !smtp_get_port(tf->port, addr, &port, US"callout"))
- log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
- addr->message);
-
- if ( ( interface == cutthrough.interface
- || ( interface
- && cutthrough.interface
- && Ustrcmp(interface, cutthrough.interface) == 0
- ) )
- && port == cutthrough.host.port
- )
- {
- uschar * resp = NULL;
-
- /* 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 (!resp || errno == ETIMEDOUT)
- {
- HDEBUG(D_verify) debug_printf("SMTP timeout\n");
- }
- else if (errno == 0)
- {
- if (*resp == 0)
- Ustrcpy(resp, US"connection dropped");
+ done = cutthrough_multi(addr, host_list, tf, &yield);
- addr->message =
- string_sprintf("response to \"%s\" from %s [%s] was: %s",
- big_buffer, host->name, host->address,
- string_printing(resp));
+ /* If we did not use a cached connection, make connections to the hosts
+ and do real callouts. The list of hosts is passed in as an argument. */
- 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");
- }
-
- /* 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)
+ for (host = host_list; host && !done; host = host->next)
{
- smtp_inblock inblock;
- smtp_outblock outblock;
int host_af;
int port = 25;
- BOOL send_quit = TRUE;
- uschar *active_hostname = smtp_active_hostname;
- 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];
- uschar * size_str;
-
- 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. */
+ smtp_context sx;
- if (host->address == NULL)
+ if (!host->address)
{
DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
host->name);
/* Set IPv4 or IPv6 */
- host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
+ host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
/* 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).
log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
addr->message);
- /* Set HELO string according to the protocol */
- lmtp= Ustrcmp(tf->protocol, "lmtp") == 0;
- smtps= Ustrcmp(tf->protocol, "smtps") == 0;
-
-
- HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
-
- /* Set up the buffer for reading SMTP response packets. */
-
- inblock.buffer = inbuffer;
- inblock.buffersize = sizeof(inbuffer);
- inblock.ptr = inbuffer;
- inblock.ptrend = inbuffer;
-
- /* Set up the buffer for holding SMTP commands while pipelining */
-
- outblock.buffer = outbuffer;
- outblock.buffersize = sizeof(outbuffer);
- outblock.ptr = outbuffer;
- outblock.cmd_count = 0;
- outblock.authenticating = FALSE;
-
- /* 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. */
-
- tls_retry_connection:
-
- /* 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)
+ sx.addrlist = addr;
+ sx.host = host;
+ sx.host_af = host_af,
+ sx.port = port;
+ sx.interface = interface;
+ sx.helo_data = tf->helo_data;
+ sx.tblock = addr->transport;
+ sx.verify = TRUE;
+
+tls_retry_connection:
+ /* Set the address state so that errors are recorded in it */
+
+ addr->transport_return = PENDING_DEFER;
+ ob->connect_timeout = callout_connect;
+ ob->command_timeout = callout;
+
+ /* Get the channel set up ready for a message (MAIL FROM being the next
+ SMTP command to send. If we tried TLS but it failed, try again without
+ if permitted */
+
+ if ( (yield = smtp_setup_conn(&sx, FALSE)) == DEFER
+ && addr->basic_errno == ERRNO_TLSFAILURE
+ && ob->tls_tempfail_tryclear
+ && verify_check_given_host(&ob->hosts_require_tls, host) != OK
+ )
+ {
+ log_write(0, LOG_MAIN, "TLS session failure:"
+ " callout unencrypted to %s [%s] (not in hosts_require_tls)",
+ host->name, host->address);
+ addr->transport_return = PENDING_DEFER;
+ yield = smtp_setup_conn(&sx, TRUE);
+ }
+ if (yield != OK)
{
- addr->message = string_sprintf("could not connect to %s [%s]: %s",
- host->name, host->address, strerror(errno));
+ errno = addr->basic_errno;
transport_name = NULL;
deliver_host = deliver_host_address = NULL;
deliver_domain = save_deliver_domain;
- continue;
- }
-
-#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
- {
- int rc;
-
- tls_out.dane_verified = FALSE;
- tls_out.tlsa_usage = 0;
-
- dane_required =
- verify_check_given_host(&ob->hosts_require_dane, host) == OK;
-
- if (host->dnssec == DS_YES)
- {
- if( dane_required
- || verify_check_given_host(&ob->hosts_try_dane, host) == OK
- )
- {
- if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required)) != OK)
- return rc;
- dane = TRUE;
- }
- }
- else if (dane_required)
- {
- log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
- return FAIL;
- }
-
- if (dane)
- ob->tls_tempfail_tryclear = FALSE;
- }
-#endif /*DANE*/
-
- /* Expand the helo_data string to find the host name to use. */
-
- 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;
- }
-
- /* 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. */
-
- 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
- {
- if (!(done= smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout)))
- goto RESPONSE_FAILED;
+ /* Failure to accept HELO is cached; this blocks the whole domain for all
+ senders. I/O errors and defer responses are not cached. */
-#ifndef DISABLE_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))
+ if (yield == FAIL && (errno == 0 || errno == ERRNO_SMTPCLOSED))
{
- lookup_dnssec_authenticated = NULL;
- /* Logging? Debug? */
- goto RESPONSE_FAILED;
+ setflag(addr, af_verify_nsfail);
+ new_domain_record.result = ccache_reject;
+ done = TRUE;
}
- 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");
-
- tls_redo_helo:
-
-#ifdef SUPPORT_TLS
- if (smtps && tls_out.active < 0) /* ssl-on-connect, first pass */
- {
- peer_offered &= ~PEER_OFFERED_TLS;
- ob->tls_tempfail_tryclear = FALSE;
- }
- else /* all other cases */
-#endif
-
- { esmtp_retry:
-
- if (!(done= smtp_write_command(&outblock, FALSE, "%s %s\r\n",
- !esmtp? "HELO" : lmtp? "LHLO" : "EHLO", active_hostname) >= 0))
- goto SEND_FAILED;
- if (!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout))
- {
- if (errno != 0 || responsebuffer[0] == 0 || lmtp || !esmtp || tls_out.active >= 0)
- {
- done= FALSE;
- goto RESPONSE_FAILED;
- }
-#ifdef SUPPORT_TLS
- peer_offered &= ~PEER_OFFERED_TLS;
-#endif
- esmtp = FALSE;
- goto esmtp_retry; /* fallback to HELO */
- }
-
- /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
-
- peer_offered = esmtp
- ? ehlo_response(responsebuffer, sizeof(responsebuffer),
- (!suppress_tls && tls_out.active < 0 ? PEER_OFFERED_TLS : 0)
- | 0 /* no IGNQ */
- | 0 /* no PRDR */
-#ifdef SUPPORT_I18N
- | (addr->prop.utf8_msg && !addr->prop.utf8_downcvt
- ? PEER_OFFERED_UTF8 : 0)
-#endif
- | 0 /* no DSN */
- | 0 /* no PIPE */
-
- /* only care about SIZE if we have size from inbound */
- | (message_size > 0 && ob->size_addition >= 0
- ? PEER_OFFERED_SIZE : 0)
- )
- : 0;
- }
-
- size_str = peer_offered & PEER_OFFERED_SIZE
- ? string_sprintf(" SIZE=%d", message_size + ob->size_addition) : US"";
-
-#ifdef SUPPORT_TLS
- tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
-#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 ( peer_offered & PEER_OFFERED_TLS
- && 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 ( errno != 0
- || buffer2[0] == 0
- || buffer2[0] == '4' && !ob->tls_tempfail_tryclear
- )
- {
- Ustrncpy(responsebuffer, buffer2, sizeof(responsebuffer));
- done= FALSE;
- goto RESPONSE_FAILED;
- }
- }
-
- /* 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);
-# ifndef DISABLE_EVENT
- (void) event_raise(addr->transport->event_action,
- US"tcp:close", NULL);
-# 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;
- }
- }
-
- /* 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,
- peer_offered & PEER_OFFERED_TLS
- ? "an attempt to start TLS failed"
- : "the server did not offer TLS support");
- done= FALSE;
- goto TLS_FAILED;
- }
-
-#endif /*SUPPORT_TLS*/
-
- done = TRUE; /* so far so good; have response to HELO */
-
- /* For now, transport_filter by cutthrough-delivery is not supported */
- /* Need proper integration with the proper transport mechanism. */
- if (cutthrough.delivery)
- {
-#ifndef DISABLE_DKIM
- uschar * s;
-#endif
- 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
- else if ((s = ob->dkim_domain) && (s = expand_string(s)) && *s)
- {
- cutthrough.delivery = FALSE;
- HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
- }
-#endif
- }
-
- SEND_FAILED:
- RESPONSE_FAILED:
- TLS_FAILED:
- ;
- /* Clear down of the TLS, SMTP and TCP layers on error is handled below. */
-
- /* 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')
- {
- setflag(addr, af_verify_nsfail);
- new_domain_record.result = ccache_reject;
- }
- }
-
-#ifdef SUPPORT_I18N
- else if ( addr->prop.utf8_msg
- && !addr->prop.utf8_downcvt
- && !(peer_offered & PEER_OFFERED_UTF8)
- )
- {
- 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 || !(peer_offered & PEER_OFFERED_UTF8))
- && (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;
+ done = FALSE;
+ goto no_conn;
}
-#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),
+ /* If we needed to authenticate, smtp_setup_conn() did that. Copy
+ the AUTH info for logging */
- /* Build a mail-AUTH string (re-using responsebuffer for convenience */
- !smtp_mail_auth_str(responsebuffer, sizeof(responsebuffer), addr, ob)
- ) &&
+ addr->authenticator = client_authenticator;
+ addr->auth_id = client_authenticated_id;
- ( (addr->auth_sndr = client_authenticated_sender),
+ sx.from_addr = from_address;
+ sx.first_addr = sx.sync_addr = addr;
+ sx.ok = FALSE; /*XXX these 3 last might not be needed for verify? */
+ sx.send_rset = TRUE;
+ sx.completed_addr = FALSE;
- /* Send the MAIL command */
- (smtp_write_command(&outblock, FALSE,
-#ifdef SUPPORT_I18N
- addr->prop.utf8_msg && !addr->prop.utf8_downcvt
- ? "MAIL FROM:<%s>%s%s SMTPUTF8\r\n"
- :
-#endif
- "MAIL FROM:<%s>%s%s\r\n",
- from_address, responsebuffer, size_str) >= 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;
- }
- }
+ new_domain_record.result =
+ old_domain_cache_result == ccache_reject_mfnull
+ ? ccache_reject_mfnull : ccache_accept;
- /* 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:<>.
+ /* Do the random local part check first. Temporarily replace the recipient
+ with the "random" value */
- 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
+ if (random_local_part)
{
+ uschar * main_address = addr->address;
const uschar * rcpt_domain = addr->domain;
#ifdef SUPPORT_I18N
}
#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:<%.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.random_stamp = time(NULL);
-
- /* If accepted, we aren't going to do any further tests below. */
+ /* This would be ok for 1st rcpt of a cutthrough (XXX do we have a count?) , but no way to
+ handle a subsequent because of the RSET. So refuse to support any. */
+ cancel_cutthrough_connection("random-recipient");
- 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");
+ addr->address = string_sprintf("%s@%.1000s",
+ random_local_part, rcpt_domain);
+ done = FALSE;
- if (randombuffer[0] == '5')
- new_domain_record.random_result = ccache_reject;
+ /* If accepted, we aren't going to do any further tests below.
+ 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.
+ XXX We don't care about that for postmaster_full. Should we?
+
+ XXX could we add another flag to the context, and have the common
+ code emit the RSET too? Even pipelined after the RCPT...
+ Then the main-verify call could use it if there's to be a subsequent
+ postmaster-verify.
+ The sync_responses() would need to be taught about it and we'd
+ need another return code filtering out to here.
+ */
- done =
- smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+ /* Remember when we last did a random test */
+ new_domain_record.random_stamp = time(NULL);
- smtp_write_command(&outblock, FALSE,
-#ifdef SUPPORT_I18N
- 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 (smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0)
+ switch(addr->transport_return)
+ {
+ case PENDING_OK:
+ new_domain_record.random_result = ccache_accept;
+ break;
+ case FAIL:
+ new_domain_record.random_result = ccache_reject;
+
+ /* Between each check, issue RSET, because some servers accept only
+ one recipient after MAIL FROM:<>.
+ XXX We don't care about that for postmaster_full. Should we? */
+
+ if ((done =
+ smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0 &&
+ smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
+ '2', callout)))
+ break;
- 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);
+ HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
+ (void)close(sx.inblock.sock);
+ sx.inblock.sock = sx.outblock.sock = -1;
#ifndef DISABLE_EVENT
(void) event_raise(addr->transport->event_action,
US"tcp:close", NULL);
#endif
+ addr->address = main_address;
+ addr->transport_return = PENDING_DEFER;
+ sx.first_addr = sx.sync_addr = addr;
+ sx.ok = FALSE;
+ sx.send_rset = TRUE;
+ sx.completed_addr = FALSE;
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. */
+ /* Re-setup for main verify, or for the error message when failing */
+ addr->address = main_address;
+ addr->transport_return = PENDING_DEFER;
+ sx.first_addr = sx.sync_addr = addr;
+ sx.ok = FALSE;
+ sx.send_rset = TRUE;
+ sx.completed_addr = FALSE;
+ }
+ else
+ done = TRUE;
- uschar * rcpt = transport_rcpt_address(addr,
- addr->transport ? addr->transport->rcpt_include_affixes : FALSE);
+ /* Main verify. 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. */
-#ifdef SUPPORT_I18N
- /*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
- ) )
+ if (done)
+ {
+ done = FALSE;
+ switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
{
- errno = ERRNO_EXPANDFAIL;
- *failure_ptr = US"recipient";
- done = FALSE;
+ case 0: switch(addr->transport_return) /* ok so far */
+ {
+ case PENDING_OK: done = TRUE;
+ new_address_record.result = ccache_accept;
+ break;
+ case FAIL: done = TRUE;
+ yield = FAIL;
+ *failure_ptr = US"recipient";
+ new_address_record.result = ccache_reject;
+ break;
+ default: break;
+ }
+ break;
+
+ case -1: /* MAIL response error */
+ *failure_ptr = US"mail";
+ if (errno == 0 && sx.buffer[0] == '5')
+ {
+ setflag(addr, af_verify_nsfail);
+ if (from_address[0] == 0)
+ new_domain_record.result = ccache_reject_mfnull;
+ }
+ break;
+ /* non-MAIL read i/o error */
+ /* non-MAIL response timeout */
+ /* internal error; channel still usable */
+ default: break; /* transmit failed */
}
- else
-#endif
+ }
- done =
- smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
- rcpt) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
+ addr->auth_sndr = client_authenticated_sender;
- if (done)
- new_address_record.result = ccache_accept;
- else if (errno == 0 && responsebuffer[0] == '5')
- {
- *failure_ptr = US"recipient";
- new_address_record.result = ccache_reject;
- }
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
- /* Do postmaster check if requested; if a full check is required, we
-
check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
+ /* 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 */
+ if (done && pm_mailfrom)
+ {
+ /* 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(&sx.outblock, FALSE, "RSET\r\n") >= 0
+ && smtp_read_response(&sx.inblock, sx.buffer,
+ sizeof(sx.buffer), '2', callout);
+
+ if (done)
+ {
+ uschar * main_address = addr->address;
+
+ /*XXX oops, affixes */
+ addr->address = string_sprintf("postmaster@%.1000s", addr->domain);
+ addr->transport_return = PENDING_DEFER;
+
+ sx.from_addr = pm_mailfrom;
+ sx.first_addr = sx.sync_addr = addr;
+ sx.ok = FALSE;
+ sx.send_rset = TRUE;
+ sx.completed_addr = FALSE;
+
+ if( smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0
+ && addr->transport_return == PENDING_OK
+ )
+ done = TRUE;
+ else
+ done = (options & vopt_callout_fullpm) != 0
+ && smtp_write_command(&sx.outblock, FALSE,
+ "RCPT TO:<postmaster>\r\n") >= 0
+ && smtp_read_response(&sx.inblock, sx.buffer,
+ sizeof(sx.buffer), '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 && sx.buffer[0] == '5')
+ {
+ *failure_ptr = US"postmaster";
+ setflag(addr, af_verify_pmfail);
+ new_domain_record.postmaster_result = ccache_reject;
+ }
+
+ addr->address = main_address;
+ }
+ }
/* 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
don't give the IP address because this may be an internal host whose identity
is not to be widely broadcast. */
- if (!done)
+no_conn:
+ switch(errno)
{
- if (errno == ETIMEDOUT)
- {
- HDEBUG(D_verify) debug_printf("SMTP timeout\n");
- send_quit = FALSE;
- }
+ case ETIMEDOUT:
+ HDEBUG(D_verify) debug_printf("SMTP timeout\n");
+ sx.send_quit = FALSE;
+ break;
+
#ifdef SUPPORT_I18N
- else if (errno == ERRNO_UTF8_FWD)
+ case 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"
+ "response to \"EHLO\" did not include SMTPUTF8");
+ addr->user_message = acl_where == ACL_WHERE_RCPT
+ ? US"533 no support for internationalised mailbox name"
: US"550 mailbox unavailable";
yield = FAIL;
done = TRUE;
}
+ break;
#endif
- else if (errno == 0)
- {
- if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped");
+ case ECONNREFUSED:
+ sx.send_quit = FALSE;
+ break;
- addr->message =
- string_sprintf("response to \"%s\" from %s [%s] was: %s",
- big_buffer, host->name, host->address,
- string_printing(responsebuffer));
+ case 0:
+ if (*sx.buffer == 0) Ustrcpy(sx.buffer, US"connection dropped");
- addr->user_message = options & vopt_is_recipient
- ? string_sprintf("Callout verification failed:\n%s", responsebuffer)
- : string_sprintf("Called: %s\nSent: %s\nResponse: %s",
- host->address, big_buffer, responsebuffer);
+ /*XXX test here is ugly; seem to have a split of responsibility for
+ building this message. Need to reationalise. Where is it done
+ before here, and when not?
+ Not == 5xx resp to MAIL on main-verify
+ */
+ if (!addr->message) addr->message =
+ string_sprintf("response to \"%s\" was: %s",
+ big_buffer, string_printing(sx.buffer));
- /* Hard rejection ends the process */
+ addr->user_message = options & vopt_is_recipient
+ ? string_sprintf("Callout verification failed:\n%s", sx.buffer)
+ : string_sprintf("Called: %s\nSent: %s\nResponse: %s",
+ host->address, big_buffer, sx.buffer);
- if (responsebuffer[0] == '5') /* Address rejected */
- {
- yield = FAIL;
- done = TRUE;
- }
- }
+ /* Hard rejection ends the process */
+
+ if (sx.buffer[0] == '5') /* Address rejected */
+ {
+ yield = FAIL;
+ done = TRUE;
+ }
+ break;
}
/* End the SMTP conversation and close the connection. */
- /* Cutthrough - on a successfull connect and recipient-verify with
+ /* Cutthrough - on a successful 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
&& !random_local_part
&& !pm_mailfrom
&& cutthrough.fd < 0
- && !lmtp
+ && !sx.lmtp
)
{
HDEBUG(D_acl|D_v) debug_printf("holding verify callout open for cutthrough delivery\n");
- cutthrough.fd = outblock.sock; /* We assume no buffer in use in the outblock */
+ cutthrough.fd = sx.outblock.sock; /* We assume no buffer in use in the outblock */
cutthrough.nrcpt = 1;
cutthrough.interface = interface;
cutthrough.host = *host;
{
/* 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");
+ cancel_cutthrough_connection("not usable for cutthrough");
+ if (sx.send_quit)
+ {
+ (void) smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
+
+ /* Wait a short time for response, and discard it */
+ smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
+ '2', 1);
+ }
+ if (sx.inblock.sock >= 0)
+ {
#ifdef SUPPORT_TLS
- tls_close(FALSE, TRUE);
+ tls_close(FALSE, TRUE);
#endif
- (void)close(inblock.sock);
+ HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
+ (void)close(sx.inblock.sock);
+ sx.inblock.sock = sx.outblock.sock = -1;
#ifndef DISABLE_EVENT
- (void) event_raise(addr->transport->event_action, US"tcp:close", NULL);
+ (void) event_raise(addr->transport->event_action, US"tcp:close", NULL);
#endif
+ }
}
+ if (!done || yield != OK)
+ addr->message = string_sprintf("%s [%s] : %s", host->name, host->address,
+ addr->message);
} /* 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.
Otherwise, we looped through the hosts but couldn't complete the business.
-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,
-implying some kind of I/O error. We don't want to write the cache in that case.
-Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
-
-if ( !(options & vopt_callout_no_cache)
- && new_domain_record.result != ccache_unknown)
- {
- if ((dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE))
- == NULL)
- {
- HDEBUG(D_verify) debug_printf("callout cache: not available\n");
- }
- else
- {
- (void)dbfn_write(dbm_file, addr->domain, &new_domain_record,
- (int)sizeof(dbdata_callout_cache));
- HDEBUG(D_verify) debug_printf("wrote callout cache domain record for %s:\n"
- " result=%d postmaster=%d random=%d\n",
- addr->domain,
- new_domain_record.result,
- new_domain_record.postmaster_result,
- new_domain_record.random_result);
- }
- }
-
-/* If a definite result was obtained for the callout, cache it unless caching
-is disabled. */
+However, there may be domain-specific information to cache in both cases. */
-if (done)
- {
- if ( !(options & vopt_callout_no_cache)
- && new_address_record.result != ccache_unknown)
- {
- if (dbm_file == NULL)
- dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE);
- if (dbm_file == NULL)
- {
- HDEBUG(D_verify) debug_printf("no callout cache available\n");
- }
- else
- {
- (void)dbfn_write(dbm_file, address_key, &new_address_record,
- (int)sizeof(dbdata_callout_cache_address));
- HDEBUG(D_verify) debug_printf("wrote %s callout cache address record for %s\n",
- new_address_record.result == ccache_accept ? "positive" : "negative",
- address_key);
- }
- }
- } /* done */
+if (!(options & vopt_callout_no_cache))
+ cache_callout_write(&new_domain_record, addr->domain,
+ done, &new_address_record, address_key);
/* Failure to connect to any host, or any response other than 2xx or 5xx is a
temporary error. If there was only one host, and a response was received, leave
it alone if supplying details. Otherwise, give a generic response. */
-else /* !done */
+if (!done)
{
- uschar *dullmsg = string_sprintf("Could not complete %s verify callout",
+ uschar * dullmsg = string_sprintf("Could not complete %s verify callout",
options & vopt_is_recipient ? "recipient" : "sender");
yield = DEFER;
- if (host_list->next != NULL || addr->message == NULL) addr->message = dullmsg;
+ addr->message = host_list->next || !addr->message
+ ? dullmsg : string_sprintf("%s: %s", dullmsg, addr->message);
- addr->user_message = (!smtp_return_error_details)? dullmsg :
- string_sprintf("%s for <%s>.\n"
+ addr->user_message = smtp_return_error_details
+ ? string_sprintf("%s for <%s>.\n"
"The mail server(s) for the domain may be temporarily unreachable, or\n"
"they may be permanently unreachable from this server. In the latter case,\n%s",
dullmsg, addr->address,
options & vopt_is_recipient
- ? "the address will never be accepted."
+ ? "the address will never be accepted."
: "you need to change the address or create an MX record for its domain\n"
"if it is supposed to be generally accessible from the Internet.\n"
- "Talk to your mail administrator for details.");
+ "Talk to your mail administrator for details.")
+ : dullmsg;
/* Force a specific error code */
/* Come here from within the cache-reading code on fast-track exit. */
END_CALLOUT:
-if (dbm_file != NULL) dbfn_close(dbm_file);
+tls_modify_variables(&tls_in);
return yield;
}
addr2 = *addr;
HDEBUG(D_acl) debug_printf("----------- %s cutthrough setup ------------\n",
rcpt_count > 1 ? "more" : "start");
-rc= verify_address(&addr2, NULL,
+rc = verify_address(&addr2, NULL,
vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache,
CUTTHROUGH_CMD_TIMEOUT, -1, -1,
NULL, NULL, NULL);
+addr->message = addr2.message;
+addr->user_message = addr2.user_message;
HDEBUG(D_acl) debug_printf("----------- end cutthrough setup ------------\n");
return rc;
}
/* Get and check response from cutthrough target */
static uschar
-cutthrough_response(char expect, uschar ** copy)
+cutthrough_response(char expect, uschar ** copy, int timeout)
{
smtp_inblock inblock;
uschar inbuffer[4096];
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))
+if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, timeout))
cancel_cutthrough_connection("target timeout on read");
if(copy != NULL)
cutthrough_flush_send();
/* Assume nothing buffered. If it was it gets ignored. */
-return cutthrough_response('3', NULL) == '3';
+return cutthrough_response('3', NULL, CUTTHROUGH_DATA_TIMEOUT) == '3';
}
-/* fd and use_crlf args only to match write_chunk() */
+/* fd and tctx args only to match write_chunk() */
static BOOL
-cutthrough_write_chunk(int fd, uschar * s, int len, BOOL use_crlf)
+cutthrough_write_chunk(int fd, transport_ctx * tctx, uschar * s, int len)
{
uschar * s2;
while(s && (s2 = Ustrchr(s, '\n')))
BOOL
cutthrough_headers_send(void)
{
+transport_ctx tctx;
+
if(cutthrough.fd < 0)
return FALSE;
*/
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))
+tctx.tblock = cutthrough.addr.transport;
+tctx.addr = &cutthrough.addr;
+tctx.check_string = US".";
+tctx.escape_string = US"..";
+tctx.options = topt_use_crlf;
+
+if (!transport_headers_send(cutthrough.fd, &tctx, &cutthrough_write_chunk))
return FALSE;
HDEBUG(D_acl) debug_printf("----------- done cutthrough headers send ------------\n");
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 */
+
+ /* Wait a short time for response, and discard it */
+ cutthrough_response('2', NULL, 1);
#ifdef SUPPORT_TLS
tls_close(FALSE, TRUE);
#endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
(void)close(cutthrough.fd);
cutthrough.fd = -1;
HDEBUG(D_acl) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why);
)
return cutthrough.addr.message;
-res = cutthrough_response('2', &cutthrough.addr.message);
+res = cutthrough_response('2', &cutthrough.addr.message, CUTTHROUGH_DATA_TIMEOUT);
for (addr = &cutthrough.addr; addr; addr = addr->next)
{
addr->message = cutthrough.addr.message;
* Check header names for 8-bit characters *
*************************************************/
-/* This function checks for invalid charcters in header names. See
+/* This function checks for invalid characters in header names. See
RFC 5322, 2.2. and RFC 6532, 3.
Arguments:
to the incoming interface address. If the sender host address is an IPv6
address, the incoming interface address will also be IPv6. */
-host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6;
-sock = ip_socket(SOCK_STREAM, host_af);
-if (sock < 0) return;
+host_af = Ustrchr(sender_host_address, ':') == NULL ? AF_INET : AF_INET6;
+if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return;
if (ip_bind(sock, host_af, interface_address, 0) < 0)
{
goto END_OFF;
}
-if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout)
- < 0)
+if (ip_connect(sock, host_af, sender_host_address, port,
+ rfc1413_query_timeout, TRUE) < 0)
{
if (errno == ETIMEDOUT && LOGGING(ident_timeout))
- {
log_write(0, LOG_MAIN, "ident connection to %s timed out",
sender_host_address);
- }
else
- {
DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n",
sender_host_address, strerror(errno));
- }
goto END_OFF;
}
}
/* If the pattern is an IP address, optionally followed by a bitmask count, do
-a (possibly masked) comparision with the current IP address. */
+a (possibly masked) comparison with the current IP address. */
if (string_is_ip_address(ss, &maskoffset) != 0)
return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
(void)tree_insertnode(&dnsbl_cache, t);
}
- /* Do the DNS loopup . */
+ /* Do the DNS lookup . */
HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query);
cb->rc = dns_basic_lookup(&dnsa, query, T_A);
git://git.exim.org / exim.git / blobdiff