-/* $Cambridge: exim/src/src/verify.c,v 1.1 2004/10/07 10:39:01 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* 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
#include "exim.h"
+#include "transports/smtp.h"
+
+#define CUTTHROUGH_CMD_TIMEOUT 30 /* timeout for cutthrough-routing calls */
+#define CUTTHROUGH_DATA_TIMEOUT 60 /* timeout for cutthrough-routing calls */
+static smtp_outblock ctblock;
+uschar ctbuffer[8192];
/* Structure for caching DNSBL lookups */
typedef struct dnsbl_cache_block {
+ time_t expiry;
dns_address *rhs;
uschar *text;
int rc;
static tree_node *dnsbl_cache = NULL;
+/* Bits for match_type in one_check_dnsbl() */
+
+#define MT_NOT 1
+#define MT_ALL 2
+
+static uschar cutthrough_response(int, char, uschar **, int);
+
+
/*************************************************
* 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;
time_t now;
dbdata_callout_cache *cache_record;
-cache_record = dbfn_read_with_length(dbm_file, key, &length);
-
-if (cache_record == NULL)
+if (!(cache_record = dbfn_read_with_length(dbm_file, key, &length)))
{
- 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;
}
-/*************************************************
-* 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)
- 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_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
+/* Check the callout cache.
+Options * pm_mailfrom may be modified by cache partial results.
-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 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)
{
-BOOL is_recipient = (options & vopt_is_recipient) != 0;
-BOOL callout_no_cache = (options & vopt_callout_no_cache) != 0;
-BOOL callout_random = (options & vopt_callout_random) != 0;
-
-int yield = OK;
-BOOL done = FALSE;
-uschar *address_key;
-uschar *from_address;
-uschar *random_local_part = NULL;
+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;
-
-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 (is_recipient)
- {
- if ((options & vopt_callout_recipsender) != 0)
- {
- address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
- from_address = sender_address;
- }
- else if ((options & vopt_callout_recippmaster) != 0)
- {
- 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. */
-if (callout_no_cache)
+if (options & vopt_callout_no_cache)
{
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)
{
- /* 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_res = 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)
- 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;
- goto END_CALLOUT;
+ *yield = FAIL;
+ *failure_ptr = US"mail";
+ dbfn_close(dbm_file);
+ return TRUE;
}
/* If a previous check on a "random" local part was accepted, we assume
the data in the new record. If a random check is required but hasn't been
done, skip the remaining cache processing. */
- if (callout_random) switch(cache_record->random_result)
+ if (options & vopt_callout_random) switch(cache_record->random_result)
{
case ccache_accept:
- HDEBUG(D_verify)
- debug_printf("callout cache: domain accepts random addresses\n");
- goto END_CALLOUT; /* Default yield is OK */
+ HDEBUG(D_verify)
+ debug_printf("callout cache: domain accepts random addresses\n");
+ 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");
- callout_random = FALSE;
- new_domain_record.random_result = ccache_reject;
- new_domain_record.random_stamp = cache_record->random_stamp;
- break;
+ HDEBUG(D_verify)
+ debug_printf("callout cache: domain rejects random addresses\n");
+ *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;
+ HDEBUG(D_verify)
+ debug_printf("callout cache: need to check random address handling "
+ "(not cached or cache expired)\n");
+ 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;
- 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";
- 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;
- }
-
-/* 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)
- {
- 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);
+ return TRUE;
}
+return FALSE;
+}
-/* Default the overall callout timeout if not set, and record the time we are
-starting so that we can enforce it. */
-
-if (callout_overall < 0) callout_overall = 4 * 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)
- {
- 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];
+/* 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;
- clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
- clearflag(addr, af_verify_nsfail); /* null sender callout flag */
+/* 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.
- /* Skip this host if we don't have an IP address for it. */
+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 (host->address == NULL)
+if (dom_rec->result != ccache_unknown)
+ if (!(dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE)))
{
- DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
- host->name);
- continue;
+ HDEBUG(D_verify) debug_printf("callout cache: not available\n");
}
-
- /* Check the overall callout timeout */
-
- if (time(NULL) - callout_start_time >= callout_overall)
+ else
{
- HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
- break;
+ (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);
}
- /* Set IPv4 or IPv6 */
-
- host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
+/* If a definite result was obtained for the callout, cache it unless caching
+is disabled. */
- /* 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 (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);
+ }
+ }
- 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;
+if (dbm_file) dbfn_close(dbm_file);
+}
- /* Set HELO string according to the protocol */
- if (Ustrcmp(tf->protocol, "lmtp") == 0) helo = US"LHLO";
+/* 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.
- HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
+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.
- /* Set up the buffer for reading SMTP response packets. */
+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;
- inblock.buffer = inbuffer;
- inblock.buffersize = sizeof(inbuffer);
- inblock.ptr = inbuffer;
- inblock.ptrend = inbuffer;
+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, ':') ? AF_INET6 : AF_INET;
+
+ 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, SCMD_FLUSH, "RCPT TO:<%.1000s>\r\n",
+ transport_rcpt_address(addr,
+ addr->transport->rcpt_include_affixes)) >= 0 &&
+ cutthrough_response(cutthrough.fd, '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(TRUE, US"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(TRUE, US"incompatible connection");
+return done;
+}
- /* 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;
+/*************************************************
+* Do callout verification for an address *
+*************************************************/
- /* Connect to the host; on failure, just loop for the next one, but we
- set the error for the last one. */
+/* 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.
- inblock.sock = outblock.sock =
- smtp_connect(host, host_af, port, interface, callout, TRUE);
- if (inblock.sock < 0)
- {
- addr->message = string_sprintf("could not connect to %s [%s]: %s",
- host->name, host->address, strerror(errno));
- continue;
- }
+Arguments:
+ addr the address that's been routed
+ host_list the list of hosts to try
+ tf the transport feedback block
- /* 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. */
+ 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
+ vopt_callout_hold => lazy close connection
+ se_mailfrom MAIL FROM address for sender verify; NULL => ""
+ pm_mailfrom if non-NULL, do the postmaster check with this sender
- Ustrcpy(big_buffer, "initial connection");
+Returns: OK/FAIL/DEFER
+*/
- done =
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+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;
- smtp_write_command(&outblock, FALSE, "%s %s\r\n", helo,
- smtp_active_hostname) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+new_domain_record.result = ccache_unknown;
+new_domain_record.postmaster_result = ccache_unknown;
+new_domain_record.random_result = ccache_unknown;
- smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n",
- from_address) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
+memset(&new_address_record, 0, sizeof(new_address_record));
- /* 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. */
+/* 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 (!done)
+if (options & vopt_is_recipient)
+ if (options & vopt_callout_recipsender)
{
- if (errno == 0 && responsebuffer[0] == '5')
- {
- setflag(addr, af_verify_nsfail);
- if (from_address[0] == 0) new_domain_record.result = ccache_reject;
- }
+ 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);
}
-
- /* 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:<>. */
-
else
{
- new_domain_record.result = ccache_accept;
+ from_address = US"";
+ address_key = addr->address;
+ }
- /* Do the random local part check first */
+/* For a sender callout, we must adjust the key if the mailfrom address is not
+empty. */
- 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,
- addr->domain) >= 0 &&
- smtp_read_response(&inblock, randombuffer,
- sizeof(randombuffer), '2', callout);
+else
+ {
+ from_address = se_mailfrom ? se_mailfrom : US"";
+ address_key = *from_address
+ ? string_sprintf("%s/<%s>", addr->address, from_address) : addr->address;
+ }
- /* Remember when we last did a random test */
+if (cached_callout_lookup(addr, address_key, from_address,
+ &options, &pm_mailfrom, &yield, failure_ptr,
+ &new_domain_record, &old_domain_cache_result))
+ {
+ cancel_cutthrough_connection(TRUE, US"cache-hit");
+ goto END_CALLOUT;
+ }
- new_domain_record.random_stamp = time(NULL);
+if (!addr->transport)
+ {
+ HDEBUG(D_verify) debug_printf("cannot callout via null transport\n");
+ }
+else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0)
+ log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp",
+ addr->transport->name, addr->transport->driver_name);
+else
+ {
+ smtp_transport_options_block *ob =
+ (smtp_transport_options_block *)addr->transport->options_block;
+ host_item * host;
- /* If accepted, we aren't going to do any further tests below. */
+ /* 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 randomising. */
- if (random_ok)
- {
- new_domain_record.random_result = ccache_accept;
- }
+ 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);
- /* 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. */
+ /* Default the connect and overall callout timeouts if not set, and record the
+ time we are starting so that we can enforce it. */
- else if (errno == 0)
- {
- if (randombuffer[0] == '5')
- new_domain_record.random_result = ccache_reject;
+ if (callout_overall < 0) callout_overall = 4 * callout;
+ if (callout_connect < 0) callout_connect = callout;
+ callout_start_time = time(NULL);
- done =
- smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+ /* 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. */
- smtp_write_command(&outblock, FALSE, "MAIL FROM:<>\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
- }
- else done = FALSE; /* Some timeout/connection problem */
- } /* Random check */
+ if (smtp_out && !disable_callout_flush) mac_smtp_fflush();
- /* 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. */
+ clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
+ clearflag(addr, af_verify_nsfail); /* null sender callout flag */
- if (new_domain_record.random_result != ccache_accept && done)
- {
- done =
- smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
- addr->address) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
+/* 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. */
- if (done)
- new_address_record.result = ccache_accept;
- else if (errno == 0 && responsebuffer[0] == '5')
- new_address_record.result = ccache_reject;
+ /* 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
+ )
+ done = cutthrough_multi(addr, host_list, tf, &yield);
- /* Do postmaster check if requested */
+ /* 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. */
- if (done && pm_mailfrom != NULL)
- {
- 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) &&
-
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout);
-
- new_domain_record.postmaster_stamp = time(NULL);
-
- if (done)
- new_domain_record.postmaster_result = ccache_accept;
- else if (errno == 0 && responsebuffer[0] == '5')
- {
- setflag(addr, af_verify_pmfail);
- new_domain_record.postmaster_result = ccache_reject;
- }
- }
- } /* Random not accepted */
- } /* MAIL FROM:<> accepted */
+ for (host = host_list; host && !done; host = host->next)
+ {
+ int host_af;
+ int port = 25;
+ uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
+ smtp_context sx;
- /* 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 (!host->address)
+ {
+ DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
+ host->name);
+ continue;
+ }
- 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. */
+ /* Check the overall callout timeout */
- if (!done)
- {
- if (errno == ETIMEDOUT)
+ if (time(NULL) - callout_start_time >= callout_overall)
+ {
+ HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
+ break;
+ }
+
+ /* Set IPv4 or IPv6 */
+
+ 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).
+ 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. */
+
+ deliver_host = host->name;
+ deliver_host_address = host->address;
+ deliver_host_port = host->port;
+ deliver_domain = addr->domain;
+ transport_name = addr->transport->name;
+
+ 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);
+
+ 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 */
+
+ yield = smtp_setup_conn(&sx, FALSE);
+#ifdef SUPPORT_TLS
+ if ( yield == DEFER
+ && addr->basic_errno == ERRNO_TLSFAILURE
+ && ob->tls_tempfail_tryclear
+ && verify_check_given_host(&ob->hosts_require_tls, host) != OK
+ )
{
- HDEBUG(D_verify) debug_printf("SMTP timeout\n");
+ log_write(0, LOG_MAIN,
+ "%s: callout unencrypted to %s [%s] (not in hosts_require_tls)",
+ addr->message, host->name, host->address);
+ addr->transport_return = PENDING_DEFER;
+ yield = smtp_setup_conn(&sx, TRUE);
}
- else if (errno == 0)
+#endif
+ if (yield != OK)
{
- if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped");
+ errno = addr->basic_errno;
+ transport_name = NULL;
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
+
+ /* Failure to accept HELO is cached; this blocks the whole domain for all
+ senders. I/O errors and defer responses are not cached. */
+
+ if (yield == FAIL && (errno == 0 || errno == ERRNO_SMTPCLOSED))
+ {
+ setflag(addr, af_verify_nsfail);
+ new_domain_record.result = ccache_reject;
+ done = TRUE;
+ }
+ else
+ done = FALSE;
+ goto no_conn;
+ }
- addr->message =
- string_sprintf("response to \"%s\" from %s [%s] was: %s",
- big_buffer, host->name, host->address,
- string_printing(responsebuffer));
+ /* If we needed to authenticate, smtp_setup_conn() did that. Copy
+ the AUTH info for logging */
- 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->authenticator = client_authenticator;
+ addr->auth_id = client_authenticated_id;
- /* Hard rejection ends the process */
+ 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;
- if (responsebuffer[0] == '5') /* Address rejected */
- {
- yield = FAIL;
- done = TRUE;
- }
- }
- }
+ new_domain_record.result = old_domain_cache_result == ccache_reject_mfnull
+ ? ccache_reject_mfnull : ccache_accept;
- /* End the SMTP conversation and close the connection. */
+ /* Do the random local part check first. Temporarily replace the recipient
+ with the "random" value */
- (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
- close(inblock.sock);
- } /* Loop through all hosts, while !done */
+ if (random_local_part)
+ {
+ uschar * main_address = addr->address;
+ const uschar * rcpt_domain = addr->domain;
+
+#ifdef SUPPORT_I18N
+ 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
-/* 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.
+ /* This would be ok for 1st rcpt of a cutthrough (the case handled here;
+ subsequents are done in cutthrough_multi()), but no way to
+ handle a subsequent because of the RSET vaporising the MAIL FROM.
+ So refuse to support any. Most cutthrough use will not involve
+ random_local_part, so no loss. */
+ cancel_cutthrough_connection(TRUE, US"random-recipient");
-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 or ccache_reject. */
+ addr->address = string_sprintf("%s@%.1000s",
+ random_local_part, rcpt_domain);
+ done = FALSE;
-if (!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:\n"
- " result=%d postmaster=%d random=%d\n",
- new_domain_record.result,
- new_domain_record.postmaster_result,
- new_domain_record.random_result);
- }
- }
+ /* 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.
+
+ Avoid using a SIZE option on the MAIL for all randon-rcpt checks.
+ */
-/* If a definite result was obtained for the callout, cache it unless caching
-is disabled. */
+ sx.avoid_option = OPTION_SIZE;
-if (done)
- {
- if (!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)
+ /* Remember when we last did a random test */
+ new_domain_record.random_stamp = time(NULL);
+
+ if (smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0)
+ switch(addr->transport_return)
+ {
+ case PENDING_OK: /* random was accepted, unfortunately */
+ new_domain_record.random_result = ccache_accept;
+ yield = OK; /* Only usable verify result we can return */
+ done = TRUE;
+ goto no_conn;
+ case FAIL: /* rejected: the preferred result */
+ new_domain_record.random_result = ccache_reject;
+ sx.avoid_option = 0;
+
+ /* 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, SCMD_FLUSH, "RSET\r\n") >= 0 &&
+ smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
+ '2', callout)))
+ break;
+
+ HDEBUG(D_acl|D_v)
+ debug_printf_indent("problem after random/rset/mfrom; reopen conn\n");
+ random_local_part = NULL;
+#ifdef SUPPORT_TLS
+ tls_close(FALSE, TRUE);
+#endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" 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;
+ case DEFER: /* 4xx response to random */
+ break; /* Just to be clear. ccache_unknown, !done. */
+ }
+
+ /* 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;
+
+ /* Main verify. For rcpt-verify use SIZE if we know it and we're not cacheing;
+ for sndr-verify never use it. */
+
+ if (done)
+ {
+ if (!(options & vopt_is_recipient && options & vopt_callout_no_cache))
+ sx.avoid_option = OPTION_SIZE;
+
+ done = FALSE;
+ switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
+ {
+ 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 */
+ }
+ }
+
+ addr->auth_sndr = client_authenticated_sender;
+
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
+
+ /* Do postmaster check if requested; if a full check is required, we
+ check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
+
+ if (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(TRUE, US"postmaster verify");
+ HDEBUG(D_acl|D_v) debug_printf_indent("Cutthrough cancelled by presence of postmaster verify\n");
+
+ done = smtp_write_command(&sx.outblock, SCMD_FLUSH, "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;
+ sx.avoid_option = OPTION_SIZE;
+
+ 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, SCMD_FLUSH,
+ "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
+
+ 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. */
+
+no_conn:
+ switch(errno)
+ {
+ case ETIMEDOUT:
+ HDEBUG(D_verify) debug_printf("SMTP timeout\n");
+ sx.send_quit = FALSE;
+ break;
+
+#ifdef SUPPORT_I18N
+ case ERRNO_UTF8_FWD:
+ {
+ extern int acl_where; /* src/acl.c */
+ errno = 0;
+ addr->message = string_sprintf(
+ "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
+ case ECONNREFUSED:
+ sx.send_quit = FALSE;
+ break;
+
+ case 0:
+ if (*sx.buffer == 0) Ustrcpy(sx.buffer, US"connection dropped");
+
+ /*XXX test here is ugly; seem to have a split of responsibility for
+ building this message. Need to rationalise. 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));
+
+ 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);
+
+ /* 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 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. Ditto for a lazy-close
+ verify. */
+
+ if ( (cutthrough.delivery || options & vopt_callout_hold)
+ && rcpt_count == 1
+ && done
+ && yield == OK
+ && (options & (vopt_callout_recipsender|vopt_callout_recippmaster|vopt_success_on_redirect))
+ == vopt_callout_recipsender
+ && !random_local_part
+ && !pm_mailfrom
+ && cutthrough.fd < 0
+ && !sx.lmtp
+ )
{
- HDEBUG(D_verify) debug_printf("no callout cache available\n");
+ HDEBUG(D_acl|D_v) debug_printf_indent("holding verify callout open for %s\n",
+ cutthrough.delivery
+ ? "cutthrough delivery" : "potential further verifies and delivery");
+
+ cutthrough.callout_hold_only = !cutthrough.delivery;
+ cutthrough.is_tls = tls_out.active >= 0;
+ cutthrough.fd = sx.outblock.sock; /* We assume no buffer in use in the outblock */
+ cutthrough.nrcpt = 1;
+ cutthrough.transport = addr->transport->name;
+ cutthrough.interface = interface;
+ cutthrough.snd_port = sending_port;
+ cutthrough.peer_options = smtp_peer_options;
+ cutthrough.host = *host;
+ {
+ int oldpool = store_pool;
+ store_pool = POOL_PERM;
+ cutthrough.snd_ip = string_copy(sending_ip_address);
+ cutthrough.host.name = string_copy(host->name);
+ cutthrough.host.address = string_copy(host->address);
+ store_pool = oldpool;
+ }
+ 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
{
- (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\n",
- (new_address_record.result == ccache_accept)? "positive" : "negative");
+ /* Ensure no cutthrough on multiple verifies that were incompatible */
+ if (options & vopt_callout_recipsender)
+ cancel_cutthrough_connection(TRUE, US"not usable for cutthrough");
+ if (sx.send_quit)
+ {
+ (void) smtp_write_command(&sx.outblock, SCMD_FLUSH, "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);
+#endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" 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
+ }
}
- }
- } /* done */
+
+ 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. */
+
+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",
- is_recipient? "recipient" : "sender");
+ 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,
- is_recipient?
- "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.");
+ options & vopt_is_recipient
+ ? "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.")
+ : 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;
}
+/* Called after recipient-acl to get a cutthrough connection open when
+ one was requested and a recipient-verify wasn't subsequently done.
+*/
+int
+open_cutthrough_connection( address_item * addr )
+{
+address_item addr2;
+int rc;
+
+/* 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_indent("----------- %s cutthrough setup ------------\n",
+ rcpt_count > 1 ? "more" : "start");
+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_indent("----------- end cutthrough setup ------------\n");
+return rc;
+}
+
+
+
+/* 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, FALSE) :
+#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_indent("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 */
+static BOOL
+cutthrough_puts(uschar * cp, int n)
+{
+if (cutthrough.fd < 0) return TRUE;
+if (_cutthrough_puts(cp, n)) return TRUE;
+cancel_cutthrough_connection(TRUE, US"transmit failed");
+return FALSE;
+}
+
+void
+cutthrough_data_puts(uschar * cp, int n)
+{
+if (cutthrough.delivery) (void) cutthrough_puts(cp, n);
+return;
+}
+
+
+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(TRUE, US"transmit failed");
+return FALSE;
+}
+
+
+static BOOL
+cutthrough_put_nl(void)
+{
+return cutthrough_puts(US"\r\n", 2);
+}
+
+
+void
+cutthrough_data_put_nl(void)
+{
+cutthrough_data_puts(US"\r\n", 2);
+}
+
+
+/* Get and check response from cutthrough target */
+static uschar
+cutthrough_response(int fd, char expect, uschar ** copy, int timeout)
+{
+smtp_inblock inblock;
+uschar inbuffer[4096];
+uschar responsebuffer[4096];
+
+inblock.buffer = inbuffer;
+inblock.buffersize = sizeof(inbuffer);
+inblock.ptr = inbuffer;
+inblock.ptrend = inbuffer;
+inblock.sock = fd;
+/* this relies on (inblock.sock == tls_out.active) */
+if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, timeout))
+ cancel_cutthrough_connection(TRUE, US"target timeout on read");
+
+if(copy)
+ {
+ 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 || cutthrough.callout_hold_only)
+ return FALSE;
+
+HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" 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(cutthrough.fd, '3', NULL, CUTTHROUGH_DATA_TIMEOUT) == '3';
+}
+
+
+/* tctx arg only to match write_chunk() */
+static BOOL
+cutthrough_write_chunk(transport_ctx * tctx, uschar * s, int len)
+{
+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)
+{
+transport_ctx tctx;
+
+if(cutthrough.fd < 0 || cutthrough.callout_hold_only)
+ 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_indent("----------- start cutthrough headers send -----------\n");
+
+tctx.u.fd = cutthrough.fd;
+tctx.tblock = cutthrough.addr.transport;
+tctx.addr = &cutthrough.addr;
+tctx.check_string = US".";
+tctx.escape_string = US"..";
+/*XXX check under spool_files_wireformat. Might be irrelevant */
+tctx.options = topt_use_crlf;
+
+if (!transport_headers_send(&tctx, &cutthrough_write_chunk))
+ return FALSE;
+
+HDEBUG(D_acl) debug_printf_indent("----------- done cutthrough headers send ------------\n");
+return TRUE;
+}
+
+
+static void
+close_cutthrough_connection(const uschar * why)
+{
+int fd = cutthrough.fd;
+if(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_indent(" SMTP>> QUIT\n");
+ _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */
+ _cutthrough_flush_send();
+ cutthrough.fd = -1; /* avoid recursion via read timeout */
+
+ /* Wait a short time for response, and discard it */
+ cutthrough_response(fd, '2', NULL, 1);
+
+#ifdef SUPPORT_TLS
+ tls_close(FALSE, TRUE);
+#endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
+ (void)close(fd);
+ HDEBUG(D_acl) debug_printf_indent("----------- cutthrough shutdown (%s) ------------\n", why);
+ }
+ctblock.ptr = ctbuffer;
+}
+
+void
+cancel_cutthrough_connection(BOOL close_noncutthrough_verifies, const uschar * why)
+{
+if (cutthrough.delivery || close_noncutthrough_verifies)
+ close_cutthrough_connection(why);
+cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
+}
+
+
+void
+release_cutthrough_connection(const uschar * why)
+{
+if (cutthrough.fd < 0) return;
+HDEBUG(D_acl) debug_printf_indent("release cutthrough conn: %s\n", why);
+cutthrough.fd = -1;
+cutthrough.delivery = cutthrough.callout_hold_only = 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_indent(" 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(cutthrough.fd, '2', &cutthrough.addr.message, CUTTHROUGH_DATA_TIMEOUT);
+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(US"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, FALSE, 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
vopt_callout_recippmaster => use postmaster for recipient
callout if > 0, specifies that callout is required, and gives timeout
- for individual connections and commands
+ 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
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, uschar *se_mailfrom, uschar *pm_mailfrom, BOOL *routed)
+ 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_test_mode? v_none :
- is_recipient? v_recipient : v_sender;
+ options & vopt_is_recipient? v_recipient : v_sender;
address_item *addr_list;
address_item *addr_new = NULL;
address_item *addr_remote = NULL;
address_item *addr_local = NULL;
address_item *addr_succeed = NULL;
+uschar **failure_ptr = options & vopt_is_recipient
+ ? &recipient_verify_failure : &sender_verify_failure;
uschar *ko_prefix, *cr;
uschar *address = vaddr->address;
uschar *save_sender;
uschar null_sender[] = { 0 }; /* Ensure writeable memory */
+/* Clear, just in case */
+
+*failure_ptr = NULL;
+
/* Set up a prefix and suffix for error message which allow us to use the same
output statements both in EXPN mode (where an SMTP response is needed) and when
debugging with an output file. */
if ((options & vopt_qualify) == 0)
{
if (f != NULL)
- fprintf(f, "%sA domain is required for \"%s\"%s\n", ko_prefix, address,
- cr);
+ respond_printf(f, "%sA domain is required for \"%s\"%s\n",
+ ko_prefix, address, cr);
+ *failure_ptr = US"qualify";
return FAIL;
}
- address = rewrite_address_qualify(address, is_recipient);
+ address = rewrite_address_qualify(address, options & vopt_is_recipient);
}
DEBUG(D_verify)
if (global_rewrite_rules != NULL)
{
uschar *old = address;
- address = rewrite_address(address, is_recipient, FALSE,
+ address = rewrite_address(address, options & vopt_is_recipient, FALSE,
global_rewrite_rules, rewrite_existflags);
if (address != old)
{
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 (so no returns allowed from here on). */
+
+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). */
save_sender = sender_address;
+/* Observability variable for router/transport use */
+
+verify_mode = options & vopt_is_recipient ? US"R" : US"S";
+
/* Update the address structure with the possibly qualified and rewritten
address. Set it up as the starting address on the chain of new addresses. */
full_info is set, and this can only be set locally. Remote enquiries just get
information about the top level address, not anything that it generated. */
-while (addr_new != NULL)
+while (addr_new)
{
int rc;
address_item *addr = addr_new;
/* 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
+ ? 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
$sender_address to <> because that is what it will be if we were trying to
send a bounce to the sender. */
- if (routed != NULL) *routed = FALSE;
+ if (routed) *routed = FALSE;
if ((rc = deliver_split_address(addr)) == OK)
{
- if (!is_recipient) sender_address = null_sender;
+ if (!(options & vopt_is_recipient)) sender_address = null_sender;
rc = route_address(addr, &addr_local, &addr_remote, &addr_new,
&addr_succeed, verify_type);
sender_address = save_sender; /* Put back the real sender */
if (rc == OK)
{
- if (routed != NULL) *routed = TRUE;
+ if (routed) *routed = TRUE;
if (callout > 0)
{
- host_item *host_list = addr->host_list;
-
- /* Default, if no remote transport, to NULL for the interface (=> any),
- "smtp" for the port, and "smtp" for the protocol. */
-
- transport_feedback tf = { NULL, US"smtp", US"smtp", NULL, FALSE, FALSE };
+ transport_instance * tp;
+ host_item * host_list = addr->host_list;
+
+ /* Make up some data for use in the case where there is no remote
+ transport. */
+
+ transport_feedback tf = {
+ .interface = NULL, /* interface (=> any) */
+ .port = US"smtp",
+ .protocol = US"smtp",
+ .hosts = NULL,
+ .helo_data = US"$smtp_active_hostname",
+ .hosts_override = FALSE,
+ .hosts_randomize = FALSE,
+ .gethostbyname = FALSE,
+ .qualify_single = TRUE,
+ .search_parents = FALSE
+ };
/* 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
sending a message to this address. */
- if (addr->transport != NULL && !addr->transport->info->local)
+ if ((tp = addr->transport) && !tp->info->local)
{
- (void)(addr->transport->setup)(addr->transport, addr, &tf, NULL);
+ (void)(tp->setup)(tp, 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
host list of the transport's hosts, and find the IP addresses */
- if (tf.hosts != NULL && (host_list == NULL || tf.hosts_override))
+ if (tf.hosts && (!host_list || 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)
+ if (!s)
{
log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts "
"\"%s\" in %s transport for callout: %s", tf.hosts,
- addr->transport->name, expand_string_message);
+ tp->name, expand_string_message);
}
else
{
- uschar *canonical_name;
- host_item *host;
+ 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. */
+ 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 = host->next)
+ for (host = host_list; host; host = nexthost)
{
- if (tf.gethostbyname || string_is_ip_address(host->name, NULL))
- (void)host_find_byname(host, NULL, &canonical_name, TRUE);
+ nexthost = host->next;
+ 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;
- (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
- &canonical_name, NULL);
- }
+ {
+ dnssec_domains * dnssec_domains = NULL;
+ if (Ustrcmp(tp->driver_name, "smtp") == 0)
+ {
+ smtp_transport_options_block * ob =
+ (smtp_transport_options_block *) tp->options_block;
+ dnssec_domains = &ob->dnssec;
+ }
+
+ (void) host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
+ dnssec_domains, NULL, NULL);
+ }
}
}
}
}
- /* Can only do a callout if we have at least one host! */
+ /* 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)
+ if (host_list)
{
HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n");
if (host_checking && !host_checking_callout)
}
else
{
+#ifdef SUPPORT_TLS
+ deliver_set_expansions(addr);
+#endif
rc = do_callout(addr, host_list, &tf, callout, callout_overall,
- options, se_mailfrom, pm_mailfrom);
+ callout_connect, options, se_mailfrom, pm_mailfrom);
}
}
else
}
}
+ /* Otherwise, any failure is a routing failure */
+
+ 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 == FAIL)
{
allok = FALSE;
- if (f != NULL)
+ if (f)
{
- fprintf(f, "%s%s %s", ko_prefix, address,
- address_test_mode? "is undeliverable" : "failed to verify");
+ 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));
- if (addr->message != NULL)
- fprintf(f, ":\n %s", addr->message);
+ respond_printf(f, ": %s", strerror(addr->basic_errno));
+ if (addr->message)
+ respond_printf(f, ": %s", addr->message);
+ }
+
+ /* Show parents iff doing full info */
+
+ if (full_info) while (p)
+ {
+ respond_printf(f, "%s\n <-- %s", cr, p->address);
+ p = p->parent;
}
- fprintf(f, "%s\n", cr);
+ respond_printf(f, "%s\n", cr);
}
+ cancel_cutthrough_connection(TRUE, US"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;
+ }
+ yield = FAIL;
}
/* Soft failure */
else if (rc == DEFER)
{
allok = FALSE;
- if (f != NULL)
+ if (f)
{
- 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));
- if (addr->message != NULL)
- fprintf(f, ":\n %s", addr->message);
+ respond_printf(f, ": %s", strerror(addr->basic_errno));
+ if (addr->message)
+ respond_printf(f, ": %s", addr->message);
else if (addr->basic_errno <= 0)
- fprintf(f, ":\n unknown error");
+ respond_printf(f, ": unknown error");
+ }
+
+ /* Show parents iff doing full info */
+
+ if (full_info) while (p)
+ {
+ respond_printf(f, "%s\n <-- %s", cr, p->address);
+ p = p->parent;
}
+ respond_printf(f, "%s\n", cr);
+ }
+ cancel_cutthrough_connection(TRUE, US"routing soft fail");
- fprintf(f, "%s\n", cr);
+ if (!full_info)
+ {
+ yield = copy_error(vaddr, addr, DEFER);
+ goto out;
}
- if (!full_info) return copy_error(vaddr, addr, DEFER);
- else if (yield == OK) yield = DEFER;
+ 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)
{
uschar *ok_prefix = US"250-";
- if (addr_new == NULL)
- {
- if (addr_local == NULL && addr_remote == NULL)
- fprintf(f, "250 mail to <%s> is discarded\r\n", address);
+
+ if (!addr_new)
+ if (!addr_local && !addr_remote)
+ respond_printf(f, "250 mail to <%s> is discarded\r\n", address);
else
- fprintf(f, "250 <%s>\r\n", address);
- }
- else while (addr_new != NULL)
+ respond_printf(f, "250 <%s>\r\n", address);
+
+ else do
{
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);
- }
- return OK;
+ if (!addr_new) ok_prefix = US"250 ";
+ respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
+ } while (addr_new);
+ yield = OK;
+ goto out;
}
/* Successful routing other than EXPN. */
just a single new address as a special case, and continues on to verify the
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 */
+ if ( !full_info /* Stop if short info wanted AND */
+ && ( ( !addr_new /* No new address OR */
+ || addr_new->next /* More than one new address OR */
+ || testflag(addr_new, af_pfr) /* New address is pfr */
+ )
+ || /* OR */
+ ( addr_new /* 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 (f) 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;
+
+ /* If stopped because more than one new address, cannot cutthrough */
+
+ if (addr_new && addr_new->next)
+ cancel_cutthrough_connection(TRUE, US"multiple addresses from routing");
+
+ yield = OK;
+ goto out;
}
}
} /* Loop for generated addresses */
or autoreplies, and there were no errors or deferments, the message is to be
discarded, usually because of the use of :blackhole: in an alias file. */
-if (allok && addr_local == NULL && addr_remote == NULL)
+if (allok && !addr_local && !addr_remote)
+ {
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++)
- {
- while (addr_list != NULL)
+for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
+ while (addr_list)
{
address_item *addr = addr_list;
address_item *p = addr->parent;
+ transport_instance * tp = addr->transport;
+
addr_list = addr->next;
fprintf(f, "%s", CS addr->address);
- while (p != NULL)
+#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))
{
- fprintf(f, "\n <-- %s", p->address);
- p = p->parent;
+ tree_node *tnode;
+ if ((tnode = tree_search(tree_duplicates, addr->unique)))
+ fprintf(f, " [duplicate, would not be delivered]");
+ else tree_add_duplicate(addr->unique, addr);
}
+
+ /* Now show its parents */
+
+ for (p = addr->parent; p; p = p->parent)
+ fprintf(f, "\n <-- %s", p->address);
fprintf(f, "\n ");
/* Show router, and transport */
- fprintf(f, "router = %s, ", addr->router->name);
- fprintf(f, "transport = %s\n", (addr->transport == NULL)? US"unset" :
- addr->transport->name);
+ fprintf(f, "router = %s, transport = %s\n",
+ addr->router->name, tp ? tp->name : US"unset");
/* Show any hosts that are set up by a router unless the transport
is going to override them; fiddle a bit to get a nice format. */
- if (addr->host_list != NULL && addr->transport != NULL &&
- !addr->transport->overrides_hosts)
+ if (addr->host_list && tp && !tp->overrides_hosts)
{
host_item *h;
int maxlen = 0;
int maxaddlen = 0;
- for (h = addr->host_list; h != NULL; h = h->next)
- {
+ for (h = addr->host_list; h; h = h->next)
+ { /* get max lengths of host names, addrs */
int len = Ustrlen(h->name);
if (len > maxlen) maxlen = len;
- len = (h->address != NULL)? Ustrlen(h->address) : 7;
+ len = h->address ? Ustrlen(h->address) : 7;
if (len > maxaddlen) maxaddlen = len;
}
- for (h = addr->host_list; h != NULL; h = h->next)
- {
- int len = Ustrlen(h->name);
- fprintf(f, " host %s ", h->name);
- while (len++ < maxlen) fprintf(f, " ");
- if (h->address != NULL)
- {
- fprintf(f, "[%s] ", h->address);
- len = Ustrlen(h->address);
- }
- else if (!addr->transport->info->local) /* Omit [unknown] for local */
- {
- fprintf(f, "[unknown] ");
- len = 7;
- }
- else len = -3;
- while (len++ < maxaddlen) fprintf(f," ");
- if (h->mx >= 0) fprintf(f, "MX=%d", h->mx);
+ for (h = addr->host_list; h; h = h->next)
+ {
+ fprintf(f, " host %-*s ", maxlen, h->name);
+
+ if (h->address)
+ fprintf(f, "[%s%-*c", h->address, maxaddlen+1 - Ustrlen(h->address), ']');
+ else if (tp->info->local)
+ fprintf(f, " %-*s ", maxaddlen, ""); /* Omit [unknown] for local */
+ else
+ fprintf(f, "[%s%-*c", "unknown", maxaddlen+1 - 7, ']');
+
+ if (h->mx >= 0) fprintf(f, " MX=%d", h->mx);
if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port);
- if (h->status == hstatus_unusable) fprintf(f, " ** unusable **");
- fprintf(f, "\n");
+ if (running_in_test_harness && h->dnssec == DS_YES) fputs(" AD", f);
+ if (h->status == hstatus_unusable) fputs(" ** unusable **", f);
+ fputc('\n', f);
}
}
}
- }
-return yield; /* Will be DEFER or FAIL if any one address has */
+/* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
+the -bv or -bt case). */
+
+out:
+verify_mode = NULL;
+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, (int)(tt - h->text), h->text, verb, len, s));
- return FAIL;
+ yield = FAIL;
+ break; /* Out of address loop */
}
/* Advance to the next address */
s = ss + (terminator? 1:0);
while (isspace(*s)) s++;
} /* Next address */
- } /* Next header */
-
-return OK;
-}
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
+ } /* Next header unless yield has been set FALSE */
+return yield;
+}
/*************************************************
-* Find if verified sender *
+* Check header names for 8-bit characters *
*************************************************/
-/* Usually, just a single address is verified as the sender of the message.
-However, Exim can be made to verify other addresses as well (often related in
-some way), and this is useful in some environments. There may therefore be a
-chain of such addresses that have previously been tested. This function finds
-whether a given address is on the chain.
+/* This function checks for invalid characters in header names. See
+RFC 5322, 2.2. and RFC 6532, 3.
-Arguments: the address to be verified
-Returns: pointer to an address item, or NULL
+Arguments:
+ msgptr where to put an error message
+
+Returns: OK
+ FAIL
*/
-address_item *
+int
+verify_check_header_names_ascii(uschar **msgptr)
+{
+header_line *h;
+uschar *colon, *s;
+
+for (h = header_list; h; 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;
+}
+
+
+
+/*************************************************
+* Find if verified sender *
+*************************************************/
+
+/* Usually, just a single address is verified as the sender of the message.
+However, Exim can be made to verify other addresses as well (often related in
+some way), and this is useful in some environments. There may therefore be a
+chain of such addresses that have previously been tested. This function finds
+whether a given address is on the chain.
+
+Arguments: the address to be verified
+Returns: pointer to an address item, or NULL
+*/
+
+address_item *
verify_checked_sender(uschar *sender)
{
address_item *addr;
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)
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, 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\"",
+ (int)(endname - h->text), h->text, *log_msgptr, (int)(ss - s), s);
+ yield = FAIL;
+ done = TRUE;
+ break;
}
- /* Else go ahead with the sender verification. But is isn't *the*
+ /* Else go ahead with the sender verification. But it isn't *the*
sender of the message, so set vopt_fake_sender to stop sender_address
being replaced after rewriting or qualification. */
{
vaddr = deliver_make_addr(address, FALSE);
new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender,
- callout, callout_overall, se_mailfrom, pm_mailfrom, NULL);
+ 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",
+ (int)(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";
int sock, host_af, qlen;
int received_sender_port, received_interface_port, n;
uschar *p;
+blob early_data;
uschar buffer[2048];
/* Default is no ident. Check whether we want to do an ident check for this
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)
+/* Construct and send the query. */
+
+qlen = snprintf(CS buffer, sizeof(buffer), "%d , %d\r\n",
+ sender_host_port, interface_port);
+early_data.data = buffer;
+early_data.len = qlen;
+
+if (ip_connect(sock, host_af, sender_host_address, port,
+ rfc1413_query_timeout, &early_data) < 0)
{
- if (errno == ETIMEDOUT && (log_extra_selector & LX_ident_timeout) != 0)
- {
+ if (errno == ETIMEDOUT && LOGGING(ident_timeout))
log_write(0, LOG_MAIN, "ident connection to %s timed out",
sender_host_address);
- }
else
- {
DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n",
sender_host_address, strerror(errno));
- }
- goto END_OFF;
- }
-
-/* Construct and send the query. */
-
-sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port);
-qlen = Ustrlen(buffer);
-if (send(sock, buffer, qlen, 0) < 0)
- {
- DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno));
goto END_OFF;
}
/* 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. */
+a (possibly masked) comparison with the current IP address. */
-if (string_is_ip_address(ss, &maskoffset))
+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. */
+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. */
+
+ if (!(handle = search_open(filename, search_type, 0, NULL, 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);
+
+ /* Using byname rather than bydns here means we cannot determine dnssec
+ status. On the other hand it is unclear how that could be either
+ propagated up or enforced. */
+
+ rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE);
if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
{
host_item *hh;
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;
-check_host_block cb;
-cb.host_name = host_name;
-cb.host_address = host_address;
+const uschar *save_host_address = deliver_host_address;
+check_host_block cb = { .host_name = host_name, .host_address = host_address };
-if (valueptr != NULL) *valueptr = NULL;
+if (valueptr) *valueptr = NULL;
/* If the host address starts off ::ffff: it is an IPv6 address in
IPv4-compatible mode. Find the IPv4 part for checking against IPv4
addresses. */
-cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)?
- host_address + 7 : host_address;
-
-return match_check_list(listptr, 0, &hostlist_anchor, &local_cache_bits,
- check_host, &cb, MCL_HOST,
- (host_address == sender_host_address)? US"host" : host_address, valueptr);
+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
+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. */
+
+deliver_host_address = host_address;
+rc = match_check_list(
+ listptr, /* the list */
+ 0, /* separator character */
+ &hostlist_anchor, /* anchor pointer */
+ &local_cache_bits, /* cache pointer */
+ check_host, /* function for testing */
+ &cb, /* argument for function */
+ MCL_HOST, /* type of check */
+ (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;
}
+/*************************************************
+* 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. 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
+ 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 *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 ( (t = tree_search(dnsbl_cache, query))
+ && (cb = t->data.ptr)->expiry > time(NULL)
+ )
+
+/* Previous lookup was cached */
+
+ {
+ HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
+ }
+
+/* If not cached from a previous lookup, we must do a DNS lookup, and
+cache the result in permanent memory. */
+
+else
+ {
+ uint ttl = 3600;
+
+ store_pool = POOL_PERM;
+
+ if (t)
+ {
+ HDEBUG(D_dnsbl) debug_printf("cached data found but past valid time; ");
+ }
+
+ else
+ { /* Set up a tree entry to cache the lookup */
+ t = store_get(sizeof(tree_node) + Ustrlen(query));
+ Ustrcpy(t->name, query);
+ t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
+ (void)tree_insertnode(&dnsbl_cache, t);
+ }
+
+ /* Do the DNS lookup . */
+
+ HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query);
+ cb->rc = dns_basic_lookup(&dnsa, query, T_A);
+ cb->text_set = FALSE;
+ cb->text = NULL;
+ cb->rhs = NULL;
+
+ /* If the lookup succeeded, cache the RHS address. The code allows for
+ more than one address - this was for complete generality and the possible
+ use of A6 records. However, A6 records have been reduced to experimental
+ status (August 2001) and may die out. So they may never get used at all,
+ let alone in dnsbl records. However, leave the code here, just in case.
+
+ Quite apart from one A6 RR generating multiple addresses, there are DNS
+ lists that return more than one A record, so we must handle multiple
+ addresses generated in that way as well.
+
+ Mark the cache entry with the "now" plus the minimum of the address TTLs,
+ or some suitably far-future time if none were found. */
+
+ if (cb->rc == DNS_SUCCEED)
+ {
+ dns_record *rr;
+ dns_address **addrp = &(cb->rhs);
+ for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ rr;
+ rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
+ {
+ if (rr->type == T_A)
+ {
+ dns_address *da = dns_address_from_rr(&dnsa, rr);
+ if (da)
+ {
+ *addrp = da;
+ while (da->next != NULL) da = da->next;
+ addrp = &(da->next);
+ if (ttl > rr->ttl) ttl = rr->ttl;
+ }
+ }
+ }
+
+ /* If we didn't find any A records, change the return code. This can
+ happen when there is a CNAME record but there are no A records for what
+ it points to. */
+
+ if (cb->rhs == NULL) cb->rc = DNS_NODATA;
+ }
+
+ cb->expiry = time(NULL)+ttl;
+ store_pool = old_pool;
+ }
+
+/* We now have the result of the DNS lookup, either newly done, or cached
+from a previous call. If the lookup succeeded, check against the address
+list if there is one. This may be a positive equality list (introduced by
+"="), a negative equality list (introduced by "!="), a positive bitmask
+list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
+
+if (cb->rc == DNS_SUCCEED)
+ {
+ dns_address *da = NULL;
+ uschar *addlist = cb->rhs->address;
+
+ /* For A and AAAA records, there may be multiple addresses from multiple
+ records. For A6 records (currently not expected to be used) there may be
+ multiple addresses from a single record. */
+
+ for (da = cb->rhs->next; da != NULL; da = da->next)
+ addlist = string_sprintf("%s, %s", addlist, da->address);
+
+ HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
+ query, addlist);
+
+ /* Address list check; this can be either for equality, or via a bitmask.
+ In the latter case, all the bits must match. */
+
+ if (iplist != 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)
+ {
+ 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];
+ int mask = 0;
+
+ /* At present, all known DNS blocking lists use A records, with
+ IPv4 addresses on the RHS encoding the information they return. I
+ wonder if this will linger on as the last vestige of IPv4 when IPv6
+ is ubiquitous? Anyway, for now we use paranoia code to completely
+ ignore IPv6 addresses. The default mask is 0, which always matches.
+ We change this only for IPv4 addresses in the list. */
+
+ if (host_aton(da->address, address) == 1) mask = address[0];
+
+ /* Scan the returned addresses, skipping any that are IPv6 */
+
+ while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
+ {
+ if (host_aton(ip, address) != 1) continue;
+ if ((address[0] & mask) == address[0]) break;
+ }
+ }
+
+ /* 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 (((match_type & MT_ALL) != 0) == (res == NULL)) break;
+ }
+
+ /* If da == NULL, either
+
+ (a) No IP address in an any ('=') list matched, or
+ (b) An IP address in an all ('==') list didn't match
+
+ so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on
+ the list. */
+
+ 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 %s for %s%c%s\n",
+ res,
+ ((match_type & MT_ALL) == 0)? "" : "=",
+ bitmask? '&' : '=', iplist);
+ }
+ return FAIL;
+ }
+ }
+
+ /* Either there was no IP list, or the record matched, 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)
+ {
+ cb->text_set = TRUE;
+ if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED)
+ {
+ dns_record *rr;
+ for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ rr != NULL;
+ rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
+ if (rr->type == T_TXT) break;
+ if (rr != NULL)
+ {
+ int len = (rr->data)[0];
+ if (len > 511) len = 127;
+ store_pool = POOL_PERM;
+ cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1));
+ store_pool = old_pool;
+ }
+ }
+ }
+
+ dnslist_value = addlist;
+ dnslist_text = cb->text;
+ return OK;
+ }
+
+/* There was a problem with the DNS lookup */
+
+if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA)
+ {
+ log_write(L_dnslist_defer, LOG_MAIN,
+ "DNS list lookup defer (probably timeout) for %s: %s", query,
+ (defer_return == OK)? US"assumed in list" :
+ (defer_return == FAIL)? US"assumed not in list" :
+ US"returned DEFER");
+ return defer_return;
+ }
+
+/* No entry was found in the DNS; continue for next domain */
+
+HDEBUG(D_dnsbl)
+ {
+ debug_printf("DNS lookup for %s failed\n", query);
+ debug_printf("=> that means %s is not listed at %s\n",
+ keydomain, domain);
+ }
+
+return FAIL;
}
+
/*************************************************
* Check host against DNS black lists *
*************************************************/
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
Arguments:
+ where the acl type
listptr the domain/address/data list
+ log_msgptr log message on error
Returns: OK successful lookup (i.e. the address is on the list), or
lookup deferred after +include_unknown
*/
int
-verify_check_dnsbl(uschar **listptr)
+verify_check_dnsbl(int where, const uschar ** listptr, uschar ** log_msgptr)
{
int sep = 0;
int defer_return = FAIL;
-int old_pool = store_pool;
-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 */
revadd[0] = 0;
+/* In case this is the first time the DNS resolver is being used. */
+
+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)
{
- BOOL frc;
+ int rc;
BOOL bitmask = FALSE;
- dns_answer dnsa;
- dns_scan dnss;
+ int match_type = 0;
+ uschar *domain_txt;
+ uschar *comma;
uschar *iplist;
uschar *key;
- tree_node *t;
- dnsbl_cache_block *cb;
HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain);
/* See if there's explicit data to be looked up */
- key = Ustrchr(domain, '/');
- if (key != NULL) *key++ = 0;
+ if ((key = Ustrchr(domain, '/'))) *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)
+ if (!(iplist = Ustrchr(domain, '=')))
{
bitmask = TRUE;
iplist = Ustrchr(domain, '&');
}
- if (iplist != NULL)
+ if (iplist) /* 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);
}
}
- /* Construct the query by adding the domain onto either the sending host
- address, or the given key string. */
+ /* Check the alternate domain if present */
- 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);
- }
- else
+ if (domain_txt != domain) for (s = domain_txt; *s != 0; s++)
{
- frc = string_format(query, sizeof(query), "%s.%s", key, domain);
- }
-
- if (!frc)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
- "(ignored): %s...", query);
- continue;
+ if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_')
+ {
+ log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
+ "strange characters - is this right?", domain_txt);
+ break;
+ }
}
- /* Look for this query in the cache. */
-
- t = tree_search(dnsbl_cache, query);
+ /* 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 not cached from a previous lookup, we must do a DNS lookup, and
- cache the result in permanent memory. */
-
- if (t == NULL)
+ if (key == NULL)
{
- store_pool = POOL_PERM;
-
- /* In case this is the first time the DNS resolver is being used. */
-
- dns_init(FALSE, FALSE);
-
- /* Set up a tree entry to cache the lookup */
-
- t = store_get(sizeof(tree_node) + Ustrlen(query));
- Ustrcpy(t->name, query);
- t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
- (void)tree_insertnode(&dnsbl_cache, t);
-
- /* Do the DNS loopup . */
-
- HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query);
- cb->rc = dns_basic_lookup(&dnsa, query, T_A);
- cb->text_set = FALSE;
- cb->text = NULL;
- cb->rhs = NULL;
-
- /* If the lookup succeeded, cache the RHS address. The code allows for
- more than one address - this was for complete generality and the possible
- use of A6 records. However, A6 records have been reduced to experimental
- status (August 2001) and may die out. So they may never get used at all,
- let alone in dnsbl records. However, leave the code here, just in case.
-
- Quite apart from one A6 RR generating multiple addresses, there are DNS
- lists that return more than one A record, so we must handle multiple
- addresses generated in that way as well. */
-
- if (cb->rc == DNS_SUCCEED)
+ if (where == ACL_WHERE_NOTSMTP_START || where == ACL_WHERE_NOTSMTP)
{
- dns_record *rr;
- dns_address **addrp = &(cb->rhs);
- for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
- {
- if (rr->type == T_A)
- {
- dns_address *da = dns_address_from_rr(&dnsa, rr);
- if (da != NULL)
- {
- *addrp = da;
- while (da->next != NULL) da = da->next;
- addrp = &(da->next);
- }
- }
- }
-
- /* If we didn't find any A records, change the return code. This can
- happen when there is a CNAME record but there are no A records for what
- it points to. */
-
- if (cb->rhs == NULL) cb->rc = DNS_NODATA;
+ *log_msgptr = string_sprintf
+ ("cannot test auto-keyed dnslists condition in %s ACL",
+ acl_wherenames[where]);
+ return ERROR;
}
-
- store_pool = old_pool;
+ if (sender_host_address == NULL) return FAIL; /* can never match */
+ if (revadd[0] == 0) invert_address(revadd, sender_host_address);
+ 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_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 */
}
- /* Previous lookup was cached */
+ /* If there is a key string, it can be a list of domains or IP addresses to
+ be concatenated with the main domain. */
else
{
- HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
- cb = t->data.ptr;
- }
-
- /* We now have the result of the DNS lookup, either newly done, or cached
- from a previous call. If the lookup succeeded, check against the address
- list if there is one. This may be a positive equality list (introduced by
- "="), a negative equality list (introduced by "!="), a positive bitmask
- list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
-
- if (cb->rc == DNS_SUCCEED)
- {
- dns_address *da = NULL;
- uschar *addlist = cb->rhs->address;
-
- /* For A and AAAA records, there may be multiple addresses from multiple
- records. For A6 records (currently not expected to be used) there may be
- multiple addresses from a single record. */
-
- for (da = cb->rhs->next; da != NULL; da = da->next)
- addlist = string_sprintf("%s, %s", addlist, da->address);
-
- HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
- query, addlist);
-
- /* Address list check; this can be either for equality, or via a bitmask.
- In the latter case, all the bits must match. */
-
- if (iplist != NULL)
+ int keysep = 0;
+ BOOL defer = FALSE;
+ uschar *keydomain;
+ uschar keybuffer[256];
+ uschar keyrevadd[128];
+
+ while ((keydomain = string_nextinlist(CUSS &key, &keysep, keybuffer,
+ sizeof(keybuffer))) != NULL)
{
- int ipsep = ',';
- uschar ip[46];
- uschar *ptr = iplist;
+ uschar *prepend = keydomain;
- while (string_nextinlist(&ptr, &ipsep, ip, sizeof(ip)) != NULL)
+ if (string_is_ip_address(keydomain, NULL) != 0)
{
- /* Handle exact matching */
- if (!bitmask)
- {
- for (da = cb->rhs; da != NULL; da = da->next)
- {
- if (Ustrcmp(CS da->address, ip) == 0) break;
- }
- }
- /* Handle bitmask matching */
- else
- {
- int address[4];
- int mask = 0;
-
- /* At present, all known DNS blocking lists use A records, with
- IPv4 addresses on the RHS encoding the information they return. I
- wonder if this will linger on as the last vestige of IPv4 when IPv6
- is ubiquitous? Anyway, for now we use paranoia code to completely
- 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];
-
- /* Scan the returned addresses, skipping any that are IPv6 */
-
- for (da = cb->rhs; da != NULL; da = da->next)
- {
- if (host_aton(da->address, address) != 1) continue;
- if ((address[0] & mask) == mask) break;
- }
- }
-
- /* Break out if a match has been found */
-
- if (da != NULL) break;
+ invert_address(keyrevadd, keydomain);
+ prepend = keyrevadd;
}
- /* If either
-
- (a) No IP address in a positive list matched, or
- (b) An IP address in a negative list did match
-
- then behave as if the DNSBL lookup had not succeeded, i.e. the host is
- not on the list. */
-
- if (invert_result != (da == NULL))
- {
- HDEBUG(D_dnsbl)
- {
- 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);
- }
- continue; /* With next DNSBL domain */
- }
- }
+ rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist,
+ bitmask, match_type, defer_return);
- /* Either there was no IP list, or the record matched. Look up a TXT record
- if it hasn't previously been done. */
-
- if (!cb->text_set)
- {
- cb->text_set = TRUE;
- if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED)
+ if (rc == OK)
{
- dns_record *rr;
- for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
- if (rr->type == T_TXT) break;
- if (rr != NULL)
- {
- int len = (rr->data)[0];
- if (len > 511) len = 127;
- store_pool = POOL_PERM;
- cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1));
- store_pool = old_pool;
- }
+ 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;
}
- }
-
- HDEBUG(D_dnsbl)
- {
- debug_printf("=> that means %s is listed at %s\n",
- (key == NULL)? sender_host_address : key, domain);
- }
-
- dnslist_domain = string_copy(domain);
- dnslist_value = addlist;
- dnslist_text = cb->text;
- return OK;
- }
-
- /* There was a problem with the DNS lookup */
- if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA)
- {
- log_write(L_dnslist_defer, LOG_MAIN,
- "DNS list lookup defer (probably timeout) for %s: %s", query,
- (defer_return == OK)? US"assumed in list" :
- (defer_return == FAIL)? US"assumed not in list" :
- US"returned DEFER");
- return defer_return;
- }
+ /* 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. */
- /* No entry was found in the DNS; continue for next domain */
+ if (rc == DEFER) defer = TRUE;
+ } /* continue with next keystring domain/address */
- HDEBUG(D_dnsbl)
- {
- debug_printf("DNS lookup for %s failed\n", query);
- debug_printf("=> that means %s is not listed at %s\n",
- (key == NULL)? sender_host_address : key, domain);
+ if (defer) return DEFER;
}
- } /* Continue with next domain */
+ } /* continue with next dnsdb outer domain */
return FAIL;
}
+/* vi: aw ai sw=2
+*/
/* End of verify.c */
projects / exim.git / blobdiff