-/* $Cambridge: exim/src/src/verify.c,v 1.23 2005/07/23 20:46:42 tom Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2005 */
+/* 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(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;
if (cache_record == NULL)
{
- HDEBUG(D_verify) debug_printf("callout cache: no %s record found\n", type);
+ HDEBUG(D_verify) debug_printf("callout cache: no %s record found for %s\n", type, key);
return NULL;
}
if (now - cache_record->time_stamp > expire)
{
- HDEBUG(D_verify) debug_printf("callout cache: %s record expired\n", type);
+ HDEBUG(D_verify) debug_printf("callout cache: %s record expired for %s\n", type, key);
return NULL;
}
cache_record->random_result = ccache_unknown;
}
-HDEBUG(D_verify) debug_printf("callout cache: found %s record\n", type);
+HDEBUG(D_verify) debug_printf("callout cache: found %s record for %s\n", type, key);
return cache_record;
}
-/*************************************************
-* Do callout verification for an address *
-*************************************************/
-
-/* This function is called from verify_address() when the address has routed to
-a host list, and a callout has been requested. Callouts are expensive; that is
-why a cache is used to improve the efficiency.
-
-Arguments:
- addr the address that's been routed
- host_list the list of hosts to try
- tf the transport feedback block
+/* Check the callout cache.
+Options * pm_mailfrom may be modified by cache partial results.
- ifstring "interface" option from transport, or NULL
- portstring "port" option from transport, or NULL
- protocolstring "protocol" option from transport, or NULL
- callout the per-command callout timeout
- callout_overall the overall callout timeout (if < 0 use 4*callout)
- callout_connect the callout connection timeout (if < 0 use callout)
- options the verification options - these bits are used:
- vopt_is_recipient => this is a recipient address
- vopt_callout_no_cache => don't use callout cache
- vopt_callout_fullpm => if postmaster check, do full one
- vopt_callout_random => do the "random" thing
- vopt_callout_recipsender => use real sender for recipient
- vopt_callout_recippmaster => use postmaster for recipient
- se_mailfrom MAIL FROM address for sender verify; NULL => ""
- pm_mailfrom if non-NULL, do the postmaster check with this sender
-
-Returns: OK/FAIL/DEFER
+Return: TRUE if result found
*/
-static int
-do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
- int callout, int callout_overall, int callout_connect, int options,
- uschar *se_mailfrom, uschar *pm_mailfrom)
+static BOOL
+cached_callout_lookup(address_item * addr, uschar * address_key,
+ uschar * from_address, int * opt_ptr, uschar ** pm_ptr,
+ int * yield, uschar ** failure_ptr,
+ dbdata_callout_cache * new_domain_record, int * old_domain_res)
{
-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;
-uschar **failure_ptr = is_recipient?
- &recipient_verify_failure : &sender_verify_failure;
+int options = *opt_ptr;
open_db dbblock;
open_db *dbm_file = NULL;
-dbdata_callout_cache new_domain_record;
-dbdata_callout_cache_address new_address_record;
-host_item *host;
-time_t callout_start_time;
-
-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;
+ *yield = FAIL;
*failure_ptr = US"mail";
- goto END_CALLOUT;
+ dbfn_close(dbm_file);
+ return TRUE;
}
/* If a previous check on a "random" local part was accepted, we assume
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;
- *failure_ptr = US"postmaster";
- setflag(addr, af_verify_pmfail);
- addr->user_message = US"(result of earlier verification reused).";
- goto END_CALLOUT;
- }
+ {
+ setflag(addr, af_verify_pmfail);
+ HDEBUG(D_verify)
+ debug_printf("callout cache: domain does not accept "
+ "RCPT TO:<postmaster@domain>\n");
+ *yield = FAIL;
+ *failure_ptr = US"postmaster";
+ setflag(addr, af_verify_pmfail);
+ addr->user_message = US"(result of earlier verification reused).";
+ dbfn_close(dbm_file);
+ return TRUE;
+ }
if (cache_record->postmaster_result == ccache_unknown)
- {
- HDEBUG(D_verify)
- debug_printf("callout cache: need to check RCPT "
- "TO:<postmaster@domain> (not cached or cache expired)\n");
- goto END_CACHE;
- }
+ {
+ HDEBUG(D_verify)
+ debug_printf("callout cache: need to check RCPT "
+ "TO:<postmaster@domain> (not cached or cache expired)\n");
+ dbfn_close(dbm_file);
+ return FALSE;
+ }
/* If cache says OK, set pm_mailfrom NULL to prevent a redundant
postmaster check if the address itself has to be checked. Also ensure
*/
HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT "
-
"TO:<postmaster@domain>\n");
- pm_mailfrom = NULL;
- new_domain_record.postmaster_result = ccache_accept;
- new_domain_record.postmaster_stamp = cache_record->postmaster_stamp;
+ "TO:<postmaster@domain>\n");
+ *pm_ptr = NULL;
+ new_domain_record->postmaster_result = ccache_accept;
+ new_domain_record->postmaster_stamp = cache_record->postmaster_stamp;
}
}
sender address if we are doing a recipient callout with a non-empty sender).
*/
- cache_address_record = (dbdata_callout_cache_address *)
- get_callout_cache_record(dbm_file,
- address_key, US"address",
- callout_cache_positive_expire,
- callout_cache_negative_expire);
+ if (!(cache_address_record = (dbdata_callout_cache_address *)
+ get_callout_cache_record(dbm_file, address_key, US"address",
+ callout_cache_positive_expire, callout_cache_negative_expire)))
+ {
+ dbfn_close(dbm_file);
+ return FALSE;
+ }
- if (cache_address_record != NULL)
+ if (cache_address_record->result == ccache_accept)
{
- if (cache_address_record->result == ccache_accept)
- {
- HDEBUG(D_verify)
- debug_printf("callout cache: address record is positive\n");
- }
- else
- {
- HDEBUG(D_verify)
- debug_printf("callout cache: address record is negative\n");
- addr->user_message = US"Previous (cached) callout verification failure";
- *failure_ptr = US"recipient";
- yield = FAIL;
- }
- goto END_CALLOUT;
+ HDEBUG(D_verify)
+ debug_printf("callout cache: address record is positive\n");
+ }
+ else
+ {
+ HDEBUG(D_verify)
+ debug_printf("callout cache: address record is negative\n");
+ addr->user_message = US"Previous (cached) callout verification failure";
+ *failure_ptr = US"recipient";
+ *yield = FAIL;
}
/* Close the cache database while we actually do the callout for real. */
- END_CACHE:
dbfn_close(dbm_file);
- dbm_file = NULL;
- }
-
-/* 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 connect and overall callout timeouts if not set, and record the
-time we are starting so that we can enforce it. */
-
-if (callout_overall < 0) callout_overall = 4 * callout;
-if (callout_connect < 0) callout_connect = callout;
-callout_start_time = time(NULL);
-
-/* Now make connections to the hosts and do real callouts. The list of hosts
-is passed in as an argument. */
-for (host = host_list; host != NULL && !done; host = host->next)
- {
- smtp_inblock inblock;
- smtp_outblock outblock;
- int host_af;
- int port = 25;
- BOOL send_quit = TRUE;
- uschar *helo = US"HELO";
- uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
- uschar inbuffer[4096];
- uschar outbuffer[1024];
- uschar responsebuffer[4096];
+/* 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, ':') == NULL)? AF_INET:AF_INET6;
+
+ if (!smtp_get_interface(tf->interface, host_af, addr, &interface,
+ US"callout") ||
+ !smtp_get_port(tf->port, addr, &port, US"callout"))
+ log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
+ addr->message);
+
+ if ( ( interface == cutthrough.interface
+ || ( interface
+ && cutthrough.interface
+ && Ustrcmp(interface, cutthrough.interface) == 0
+ ) )
+ && port == cutthrough.host.port
+ )
+ {
+ uschar * resp = NULL;
+
+ /* Match! Send the RCPT TO, set done from the response */
+ done =
+ smtp_write_command(&ctblock, FALSE, "RCPT TO:<%.1000s>\r\n",
+ transport_rcpt_address(addr,
+ addr->transport->rcpt_include_affixes)) >= 0 &&
+ cutthrough_response('2', &resp, CUTTHROUGH_DATA_TIMEOUT) == '2';
+
+ /* This would go horribly wrong if a callout fail was ignored by ACL.
+ We punt by abandoning cutthrough on a reject, like the
+ first-rcpt does. */
+
+ if (done)
+ {
+ address_item * na = store_get(sizeof(address_item));
+ *na = cutthrough.addr;
+ cutthrough.addr = *addr;
+ cutthrough.addr.host_used = &cutthrough.host;
+ cutthrough.addr.next = na;
+
+ cutthrough.nrcpt++;
+ }
+ else
+ {
+ cancel_cutthrough_connection("recipient rejected");
+ if (!resp || errno == ETIMEDOUT)
+ {
+ HDEBUG(D_verify) debug_printf("SMTP timeout\n");
+ }
+ else if (errno == 0)
+ {
+ if (*resp == 0)
+ Ustrcpy(resp, US"connection dropped");
+
+ addr->message =
+ string_sprintf("response to \"%s\" was: %s",
+ big_buffer, string_printing(resp));
+
+ addr->user_message =
+ string_sprintf("Callout verification failed:\n%s", resp);
+
+ /* Hard rejection ends the process */
+
+ if (resp[0] == '5') /* Address rejected */
+ {
+ *yield = FAIL;
+ done = TRUE;
+ }
+ }
+ }
+ }
+ break; /* host_list */
+ }
+if (!done)
+ cancel_cutthrough_connection("incompatible connection");
+return done;
+}
- /* 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. Use the callout_connect timeout. */
+/* 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_connect, 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
+ 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)
{
- *failure_ptr = US"mail";
- 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))
+ 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;
-
- 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",
- from_address) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
- }
- else done = FALSE; /* Some timeout/connection problem */
- } /* Random check */
+ if (callout_overall < 0) callout_overall = 4 * callout;
+ if (callout_connect < 0) callout_connect = callout;
+ callout_start_time = time(NULL);
- /* If the host is accepting all local parts, as determined by the "random"
- check, we don't need to waste time doing any further checking. */
-
- if (new_domain_record.random_result != ccache_accept && done)
- {
- /* Get the rcpt_include_affixes flag from the transport if there is one,
- but assume FALSE if there is not. */
+ /* 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. */
- done =
- smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
- transport_rcpt_address(addr,
- (addr->transport == NULL)? FALSE :
- addr->transport->rcpt_include_affixes)) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
+ if (smtp_out && !disable_callout_flush) mac_smtp_fflush();
- if (done)
- new_address_record.result = ccache_accept;
- else if (errno == 0 && responsebuffer[0] == '5')
- {
- *failure_ptr = US"recipient";
- new_address_record.result = ccache_reject;
- }
+ clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
+ clearflag(addr, af_verify_nsfail); /* null sender callout flag */
- /* Do postmaster check if requested; if a full check is required, we
- check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
+/* 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 && pm_mailfrom != NULL)
- {
- done =
- smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout) &&
+ /* 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);
- smtp_write_command(&outblock, FALSE,
- "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout) &&
+ /* 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. */
- /* First try using the current domain */
+ 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;
- ((
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout)
- )
+ if (!host->address)
+ {
+ DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
+ host->name);
+ continue;
+ }
- ||
+ /* Check the overall callout timeout */
- /* If that doesn't work, and a full check is requested,
- try without the domain. */
+ if (time(NULL) - callout_start_time >= callout_overall)
+ {
+ HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
+ break;
+ }
- (
- (options & vopt_callout_fullpm) != 0 &&
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<postmaster>\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout)
- ));
+ /* 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
+ )
+ {
+ 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);
+ }
+#endif
+ if (yield != OK)
+ {
+ 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;
+ }
- /* Sort out the cache record */
+ /* If we needed to authenticate, smtp_setup_conn() did that. Copy
+ the AUTH info for logging */
- new_domain_record.postmaster_stamp = time(NULL);
+ addr->authenticator = client_authenticator;
+ addr->auth_id = client_authenticated_id;
- if (done)
- new_domain_record.postmaster_result = ccache_accept;
- else if (errno == 0 && responsebuffer[0] == '5')
- {
- *failure_ptr = US"postmaster";
- setflag(addr, af_verify_pmfail);
- new_domain_record.postmaster_result = ccache_reject;
- }
- }
- } /* Random not accepted */
- } /* MAIL FROM: accepted */
+ 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;
- /* 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
+ new_domain_record.result = old_domain_cache_result == ccache_reject_mfnull
+ ? ccache_reject_mfnull : ccache_accept;
- 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. */
+ /* Do the random local part check first. Temporarily replace the recipient
+ with the "random" value */
- if (!done)
- {
- if (errno == ETIMEDOUT)
- {
- HDEBUG(D_verify) debug_printf("SMTP timeout\n");
- send_quit = FALSE;
- }
- else if (errno == 0)
+ if (random_local_part)
{
- if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped");
+ 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
- addr->message =
- string_sprintf("response to \"%s\" from %s [%s] was: %s",
- big_buffer, host->name, host->address,
- string_printing(responsebuffer));
+ /* This would be ok for 1st rcpt of a cutthrough (XXX do we have a count?) , but no way to
+ handle a subsequent because of the RSET. So refuse to support any. */
+ cancel_cutthrough_connection("random-recipient");
- 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->address = string_sprintf("%s@%.1000s",
+ random_local_part, rcpt_domain);
+ done = FALSE;
- /* Hard rejection ends the process */
+ /* 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.
+ */
- if (responsebuffer[0] == '5') /* Address rejected */
- {
- yield = FAIL;
- done = TRUE;
- }
+ /* 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:
+ new_domain_record.random_result = ccache_accept;
+ break;
+ case FAIL:
+ new_domain_record.random_result = ccache_reject;
+
+ /* Between each check, issue RSET, because some servers accept only
+ one recipient after MAIL FROM:<>.
+ XXX We don't care about that for postmaster_full. Should we? */
+
+ if ((done =
+ smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0 &&
+ smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
+ '2', callout)))
+ break;
+
+ 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;
+ }
+
+ /* 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;
- /* End the SMTP conversation and close the connection. */
+ /* Main verify. If the host is accepting all local parts, as determined
+ by the "random" check, we don't need to waste time doing any further
+ checking. */
- if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
- (void)close(inblock.sock);
- } /* Loop through all hosts, while !done */
+ if (done)
+ {
+ 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 */
+ }
+ }
-/* 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.
+ addr->auth_sndr = client_authenticated_sender;
-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. */
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
-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);
- }
- }
+ /* 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 a definite result was obtained for the callout, cache it unless caching
-is disabled. */
+ if (done && pm_mailfrom)
+ {
+ /* Could possibly shift before main verify, just above, and be ok
+ for cutthrough. But no way to handle a subsequent rcpt, so just
+ refuse any */
+ cancel_cutthrough_connection("postmaster verify");
+ HDEBUG(D_acl|D_v) debug_printf_indent("Cutthrough cancelled by presence of postmaster verify\n");
-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)
+ done = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0
+ && smtp_read_response(&sx.inblock, sx.buffer,
+ sizeof(sx.buffer), '2', callout);
+
+ if (done)
+ {
+ uschar * main_address = addr->address;
+
+ /*XXX oops, affixes */
+ addr->address = string_sprintf("postmaster@%.1000s", addr->domain);
+ addr->transport_return = PENDING_DEFER;
+
+ sx.from_addr = pm_mailfrom;
+ sx.first_addr = sx.sync_addr = addr;
+ sx.ok = FALSE;
+ sx.send_rset = TRUE;
+ sx.completed_addr = FALSE;
+
+ if( smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0
+ && addr->transport_return == PENDING_OK
+ )
+ done = TRUE;
+ else
+ done = (options & vopt_callout_fullpm) != 0
+ && smtp_write_command(&sx.outblock, FALSE,
+ "RCPT TO:<postmaster>\r\n") >= 0
+ && smtp_read_response(&sx.inblock, sx.buffer,
+ sizeof(sx.buffer), '2', callout);
+
+ /* Sort out the cache record */
+
+ new_domain_record.postmaster_stamp = time(NULL);
+
+ if (done)
+ new_domain_record.postmaster_result = ccache_accept;
+ else if (errno == 0 && sx.buffer[0] == '5')
+ {
+ *failure_ptr = US"postmaster";
+ setflag(addr, af_verify_pmfail);
+ new_domain_record.postmaster_result = ccache_reject;
+ }
+
+ addr->address = main_address;
+ }
+ }
+ /* For any failure of the main check, other than a negative response, we just
+ close the connection and carry on. We can identify a negative response by the
+ fact that errno is zero. For I/O errors it will be non-zero
+
+ 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 reationalise. Where is it done
+ before here, and when not?
+ Not == 5xx resp to MAIL on main-verify
+ */
+ if (!addr->message) addr->message =
+ string_sprintf("response to \"%s\" was: %s",
+ big_buffer, string_printing(sx.buffer));
+
+ 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 */
+ if ( cutthrough.delivery
+ && 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 cutthrough delivery\n");
+
+ cutthrough.fd = sx.outblock.sock; /* We assume no buffer in use in the outblock */
+ cutthrough.nrcpt = 1;
+ cutthrough.interface = interface;
+ cutthrough.host = *host;
+ cutthrough.addr = *addr; /* Save the address_item for later logging */
+ cutthrough.addr.next = NULL;
+ cutthrough.addr.host_used = &cutthrough.host;
+ if (addr->parent)
+ *(cutthrough.addr.parent = store_get(sizeof(address_item))) =
+ *addr->parent;
+ ctblock.buffer = ctbuffer;
+ ctblock.buffersize = sizeof(ctbuffer);
+ ctblock.ptr = ctbuffer;
+ /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */
+ ctblock.sock = cutthrough.fd;
}
else
{
- (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 address verifies */
+ if (options & vopt_callout_recipsender)
+ cancel_cutthrough_connection("not usable for cutthrough");
+ if (sx.send_quit)
+ {
+ (void) smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
+
+ /* Wait a short time for response, and discard it */
+ smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
+ '2', 1);
+ }
+
+ if (sx.inblock.sock >= 0)
+ {
+#ifdef SUPPORT_TLS
+ tls_close(FALSE, TRUE);
+#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) :
+#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 */
+BOOL
+cutthrough_puts(uschar * cp, int n)
+{
+if (cutthrough.fd < 0) return TRUE;
+if (_cutthrough_puts(cp, n)) return TRUE;
+cancel_cutthrough_connection("transmit failed");
+return FALSE;
+}
+
+
+static BOOL
+_cutthrough_flush_send(void)
+{
+int n= ctblock.ptr-ctblock.buffer;
+
+if(n>0)
+ if(!cutthrough_send(n))
+ return FALSE;
+return TRUE;
+}
+
+
+/* Send out any bufferred output. Return boolean success. */
+BOOL
+cutthrough_flush_send(void)
+{
+if (_cutthrough_flush_send()) return TRUE;
+cancel_cutthrough_connection("transmit failed");
+return FALSE;
+}
+
+
+BOOL
+cutthrough_put_nl(void)
+{
+return cutthrough_puts(US"\r\n", 2);
+}
+
+
+/* Get and check response from cutthrough target */
+static uschar
+cutthrough_response(char expect, uschar ** copy, 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 = cutthrough.fd;
+/* this relies on (inblock.sock == tls_out.active) */
+if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, timeout))
+ cancel_cutthrough_connection("target timeout on read");
+
+if(copy != NULL)
+ {
+ uschar * cp;
+ *copy = cp = string_copy(responsebuffer);
+ /* Trim the trailing end of line */
+ cp += Ustrlen(responsebuffer);
+ if(cp > *copy && cp[-1] == '\n') *--cp = '\0';
+ if(cp > *copy && cp[-1] == '\r') *--cp = '\0';
+ }
+
+return responsebuffer[0];
+}
+
+
+/* Negotiate dataphase with the cutthrough target, returning success boolean */
+BOOL
+cutthrough_predata(void)
+{
+if(cutthrough.fd < 0)
+ return FALSE;
+
+HDEBUG(D_transport|D_acl|D_v) debug_printf_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('3', NULL, CUTTHROUGH_DATA_TIMEOUT) == '3';
+}
+
+
+/* fd and tctx args only to match write_chunk() */
+static BOOL
+cutthrough_write_chunk(int fd, 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)
+ 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.tblock = cutthrough.addr.transport;
+tctx.addr = &cutthrough.addr;
+tctx.check_string = US".";
+tctx.escape_string = US"..";
+tctx.options = topt_use_crlf;
+
+if (!transport_headers_send(cutthrough.fd, &tctx, &cutthrough_write_chunk))
+ return FALSE;
+
+HDEBUG(D_acl) debug_printf_indent("----------- done cutthrough headers send ------------\n");
+return TRUE;
+}
+
+
+static void
+close_cutthrough_connection(const char * why)
+{
+if(cutthrough.fd >= 0)
+ {
+ /* We could be sending this after a bunch of data, but that is ok as
+ the only way to cancel the transfer in dataphase is to drop the tcp
+ conn before the final dot.
+ */
+ ctblock.ptr = ctbuffer;
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n");
+ _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */
+ _cutthrough_flush_send();
+
+ /* Wait a short time for response, and discard it */
+ cutthrough_response('2', NULL, 1);
+
+ #ifdef SUPPORT_TLS
+ tls_close(FALSE, TRUE);
+ #endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
+ (void)close(cutthrough.fd);
+ cutthrough.fd = -1;
+ HDEBUG(D_acl) debug_printf_indent("----------- cutthrough shutdown (%s) ------------\n", why);
+ }
+ctblock.ptr = ctbuffer;
+}
+
+void
+cancel_cutthrough_connection(const char * why)
+{
+close_cutthrough_connection(why);
+cutthrough.delivery = FALSE;
+}
+
+
+
+
+/* Have senders final-dot. Send one to cutthrough target, and grab the response.
+ Log an OK response as a transmission.
+ Close the connection.
+ Return smtp response-class digit.
+*/
+uschar *
+cutthrough_finaldot(void)
+{
+uschar res;
+address_item * addr;
+HDEBUG(D_transport|D_acl|D_v) debug_printf_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('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("delivered");
+ break;
+
+ case '4':
+ delivery_log(LOG_MAIN, addr, 0,
+ US"tmp-reject from cutthrough after DATA:");
+ break;
+
+ case '5':
+ delivery_log(LOG_MAIN|LOG_REJECT, addr, 0,
+ US"rejected after DATA:");
+ break;
+
+ default:
+ break;
+ }
+ }
+return cutthrough.addr.message;
+}
+
+
+
/*************************************************
* Copy error to toplevel address *
*************************************************/
vaddr->user_message = addr->user_message;
vaddr->basic_errno = addr->basic_errno;
vaddr->more_errno = addr->more_errno;
+ vaddr->prop.address_data = addr->prop.address_data;
+ copyflag(vaddr, addr, af_pass_message);
}
return yield;
}
+/**************************************************
+* printf that automatically handles TLS if needed *
+***************************************************/
+
+/* This function is used by verify_address() as a substitute for all fprintf()
+calls; a direct fprintf() will not produce output in a TLS SMTP session, such
+as a response to an EXPN command. smtp_in.c makes smtp_printf available but
+that assumes that we always use the smtp_out FILE* when not using TLS or the
+ssl buffer when we are. Instead we take a FILE* parameter and check to see if
+that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
+fprintf().
+
+Arguments:
+ f the candidate FILE* to write to
+ format format string
+ ... optional arguments
+
+Returns:
+ nothing
+*/
+
+static void PRINTF_FUNCTION(2,3)
+respond_printf(FILE *f, const char *format, ...)
+{
+va_list ap;
+
+va_start(ap, format);
+if (smtp_out && (f == smtp_out))
+ smtp_vprintf(format, ap);
+else
+ vfprintf(f, format, ap);
+va_end(ap);
+}
+
+
+
/*************************************************
* Verify an email address *
*************************************************/
{
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 = is_recipient?
- &recipient_verify_failure : &sender_verify_failure;
+uschar **failure_ptr = options & vopt_is_recipient
+ ? &recipient_verify_failure : &sender_verify_failure;
uschar *ko_prefix, *cr;
uschar *address = vaddr->address;
uschar *save_sender;
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
$sender_address to <> because that is what it will be if we were trying to
send a bounce to the sender. */
- if (routed != NULL) *routed = FALSE;
+ if (routed) *routed = FALSE;
if ((rc = deliver_split_address(addr)) == OK)
{
- if (!is_recipient) sender_address = null_sender;
+ if (!(options & vopt_is_recipient)) sender_address = null_sender;
rc = route_address(addr, &addr_local, &addr_remote, &addr_new,
&addr_succeed, verify_type);
sender_address = save_sender; /* Put back the real sender */
if (rc == OK)
{
- if (routed != NULL) *routed = TRUE;
+ if (routed) *routed = TRUE;
if (callout > 0)
{
- host_item *host_list = addr->host_list;
-
- /* Default, if no remote transport, to NULL for the interface (=> any),
- "smtp" for the port, and "smtp" for the protocol. */
-
- transport_feedback tf = { NULL, US"smtp", US"smtp", NULL, FALSE, FALSE };
+ transport_instance * tp;
+ host_item * host_list = addr->host_list;
+
+ /* Make up some data for use in the case where there is no remote
+ transport. */
+
+ transport_feedback tf = {
+ NULL, /* interface (=> any) */
+ US"smtp", /* port */
+ US"smtp", /* protocol */
+ NULL, /* hosts */
+ US"$smtp_active_hostname", /* helo_data */
+ FALSE, /* hosts_override */
+ FALSE, /* hosts_randomize */
+ FALSE, /* gethostbyname */
+ TRUE, /* qualify_single */
+ FALSE /* search_parents */
+ };
/* If verification yielded a remote transport, we want to use that
transport's options, so as to mimic what would happen if we were really
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;
+ int flags;
host_item *host, *nexthost;
host_build_hostlist(&host_list, s, tf.hosts_randomize);
additional host items being inserted into the chain. Hence we must
save the next host first. */
- for (host = host_list; host != NULL; host = nexthost)
+ 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; host = nexthost)
{
nexthost = host->next;
if (tf.gethostbyname ||
- string_is_ip_address(host->name, NULL) > 0)
- (void)host_find_byname(host, NULL, &canonical_name, TRUE);
+ 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! 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,
callout_connect, options, se_mailfrom, pm_mailfrom);
}
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("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("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 */
- || /* OR */
- (addr_new != NULL && /* At least one new address AND */
- success_on_redirect))) /* success_on_redirect is set */
+ 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("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);
#ifdef EXPERIMENTAL_SRS
- if(addr->p.srs_sender)
- fprintf(f, " [srs = %s]", addr->p.srs_sender);
+ if(addr->prop.srs_sender)
+ fprintf(f, " [srs = %s]", addr->prop.srs_sender);
#endif
- while (p != NULL)
+
+ /* 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);
}
}
}
- }
-/* Will be DEFER or FAIL if any one address has, only for full_info (which is
+/* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
the -bv or -bt case). */
+out:
+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, tt - h->text, h->text, verb, len, s));
- return FAIL;
+ yield = FAIL;
+ break; /* Out of address loop */
}
/* Advance to the next address */
s = ss + (terminator? 1:0);
while (isspace(*s)) s++;
} /* Next address */
- } /* Next header */
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
+ } /* Next header unless yield has been set FALSE */
+
+return yield;
+}
+
+
+/*************************************************
+* Check header names for 8-bit characters *
+*************************************************/
+
+/* This function checks for invalid characters in header names. See
+RFC 5322, 2.2. and RFC 6532, 3.
+
+Arguments:
+ msgptr where to put an error message
+
+Returns: OK
+ FAIL
+*/
+
+int
+verify_check_header_names_ascii(uschar **msgptr)
+{
+header_line *h;
+uschar *colon, *s;
+
+for (h = header_list; h != NULL; h = h->next)
+ {
+ colon = Ustrchr(h->text, ':');
+ for(s = h->text; s < colon; s++)
+ {
+ if ((*s < 33) || (*s > 126))
+ {
+ *msgptr = string_sprintf("Invalid character in header \"%.*s\" found",
+ colon - h->text, h->text);
+ return FAIL;
+ }
+ }
+ }
return OK;
}
+/*************************************************
+* Check for blind recipients *
+*************************************************/
+
+/* This function checks that every (envelope) recipient is mentioned in either
+the To: or Cc: header lines, thus detecting blind carbon copies.
+
+There are two ways of scanning that could be used: either scan the header lines
+and tick off the recipients, or scan the recipients and check the header lines.
+The original proposed patch did the former, but I have chosen to do the latter,
+because (a) it requires no memory and (b) will use fewer resources when there
+are many addresses in To: and/or Cc: and only one or two envelope recipients.
+
+Arguments: none
+Returns: OK if there are no blind recipients
+ FAIL if there is at least one blind recipient
+*/
+
+int
+verify_check_notblind(void)
+{
+int i;
+for (i = 0; i < recipients_count; i++)
+ {
+ header_line *h;
+ BOOL found = FALSE;
+ uschar *address = recipients_list[i].address;
+
+ for (h = header_list; !found && h != NULL; h = h->next)
+ {
+ uschar *colon, *s;
+
+ if (h->type != htype_to && h->type != htype_cc) continue;
+
+ colon = Ustrchr(h->text, ':');
+ s = colon + 1;
+ while (isspace(*s)) s++;
+
+ /* Loop for multiple addresses in the header, enabling group syntax. Note
+ that we have to reset this after the header has been scanned. */
+
+ parse_allow_group = TRUE;
+
+ while (*s != 0)
+ {
+ uschar *ss = parse_find_address_end(s, FALSE);
+ uschar *recipient,*errmess;
+ int terminator = *ss;
+ int start, end, domain;
+
+ /* Temporarily terminate the string at this point, and extract the
+ operative address within, allowing group syntax. */
+
+ *ss = 0;
+ recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
+ *ss = terminator;
+
+ /* If we found a valid recipient that has a domain, compare it with the
+ envelope recipient. Local parts are compared case-sensitively, domains
+ case-insensitively. By comparing from the start with length "domain", we
+ include the "@" at the end, which ensures that we are comparing the whole
+ local part of each address. */
+
+ if (recipient != NULL && domain != 0)
+ {
+ found = Ustrncmp(recipient, address, domain) == 0 &&
+ strcmpic(recipient + domain, address + domain) == 0;
+ if (found) break;
+ }
+
+ /* Advance to the next address */
+
+ s = ss + (terminator? 1:0);
+ while (isspace(*s)) s++;
+ } /* Next address */
+
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
+ } /* Next header (if found is false) */
+
+ if (!found) return FAIL;
+ } /* Next recipient */
+
+return OK;
+}
uschar *pm_mailfrom, int options, int *verrno)
{
static int header_types[] = { htype_sender, htype_reply_to, htype_from };
+BOOL done = FALSE;
int yield = FAIL;
int i;
-for (i = 0; i < 3; i++)
+for (i = 0; i < 3 && !done; i++)
{
header_line *h;
- for (h = header_list; h != NULL; h = h->next)
+ for (h = header_list; h != NULL && !done; h = h->next)
{
int terminator, new_ok;
uschar *s, *ss, *endname;
if (h->type != header_types[i]) continue;
s = endname = Ustrchr(h->text, ':') + 1;
+ /* Scan the addresses in the header, enabling group syntax. Note that we
+ have to reset this after the header has been scanned. */
+
+ parse_allow_group = TRUE;
+
while (*s != 0)
{
address_item *vaddr;
else
{
int start, end, domain;
- uschar *address = parse_extract_address(s, log_msgptr, &start,
- &end, &domain, FALSE);
+ uschar *address = parse_extract_address(s, log_msgptr, &start, &end,
+ &domain, FALSE);
*ss = terminator;
+ /* If we found an empty address, just carry on with the next one, but
+ kill the message. */
+
+ if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0)
+ {
+ *log_msgptr = NULL;
+ s = ss;
+ continue;
+ }
+
/* If verification failed because of a syntax error, fail this
function, and ensure that the failing address gets added to the error
message. */
if (address == NULL)
{
new_ok = FAIL;
- if (*log_msgptr != NULL)
- {
- while (ss > s && isspace(ss[-1])) ss--;
- *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
- "scanning for sender: %s in \"%.*s\"",
- endname - h->text, h->text, *log_msgptr, ss - s, s);
- return FAIL;
- }
+ while (ss > s && isspace(ss[-1])) ss--;
+ *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
+ "scanning for sender: %s in \"%.*s\"",
+ endname - h->text, h->text, *log_msgptr, ss - s, s);
+ yield = FAIL;
+ done = TRUE;
+ break;
}
/* Else go ahead with the sender verification. But it isn't *the*
/* Success or defer */
- if (new_ok == OK) return OK;
+ if (new_ok == OK)
+ {
+ yield = OK;
+ done = TRUE;
+ break;
+ }
+
if (new_ok == DEFER) yield = DEFER;
/* Move on to any more addresses in the header */
s = ss;
- }
- }
- }
+ } /* Next address */
+
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
+ } /* Next header, unless done */
+ } /* Next header type unless done */
if (yield == FAIL && *log_msgptr == NULL)
*log_msgptr = US"there is no valid sender in any header line";
to the incoming interface address. If the sender host address is an IPv6
address, the incoming interface address will also be IPv6. */
-host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6;
-sock = ip_socket(SOCK_STREAM, host_af);
-if (sock < 0) return;
+host_af = Ustrchr(sender_host_address, ':') == NULL ? AF_INET : AF_INET6;
+if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return;
if (ip_bind(sock, host_af, interface_address, 0) < 0)
{
goto END_OFF;
}
-if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout)
- < 0)
+if (ip_connect(sock, host_af, sender_host_address, port,
+ rfc1413_query_timeout, TRUE) < 0)
{
- if (errno == ETIMEDOUT && (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;
}
/* The rest of the line is the data we want. We turn it into printing
characters when we save it, so that it cannot mess up the format of any logging
or Received: lines into which it gets inserted. We keep a maximum of 127
-characters. */
+characters. The deconst cast is ok as we fed a nonconst to string_printing() */
-sender_ident = string_printing(string_copyn(p, 127));
+sender_ident = US string_printing(string_copyn(p, 127));
DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident);
END_OFF:
*/
int
-check_host(void *arg, uschar *ss, uschar **valueptr, uschar **error)
+check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error)
{
check_host_block *cb = (check_host_block *)arg;
int mlen = -1;
BOOL iplookup = FALSE;
BOOL isquery = FALSE;
BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0;
-uschar *t = ss;
+const uschar *t;
uschar *semicolon;
uschar **aliases;
}
/* If the pattern is an IP address, optionally followed by a bitmask count, do
-a (possibly masked) comparision with the current IP address. */
+a (possibly masked) comparison with the current IP address. */
-if (string_is_ip_address(ss, &maskoffset) > 0)
+if (string_is_ip_address(ss, &maskoffset) != 0)
return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
+/* 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))
+ {
+ *error = US"malformed IPv4 address or address mask";
+ return ERROR;
+ }
+
/* See if there is a semicolon in the pattern */
semicolon = Ustrchr(ss, ';');
/* If we are doing an IP address only match, then all lookups must be IP
-address lookups. */
+address lookups, even if there is no "net-". */
if (isiponly)
{
}
/* 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. 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. */
-
-else if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL)
+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. */
+
+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;
/* Do the IP address lookup if that is indeed what we have */
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
- 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. */
+ /* 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".
+ */
- if (mac_islookup(search_type, lookup_querystyle))
+ 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
+ else /* Single-key style */
{
+ int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)?
+ ':' : '.';
insize = host_aton(cb->host_address, incoming);
host_mask(insize, incoming, mlen);
- (void)host_nmtoa(insize, incoming, mlen, buffer, '.');
+ (void)host_nmtoa(insize, incoming, mlen, buffer, sep);
key = buffer;
filename = semicolon + 1;
}
/* Now do the actual lookup; note that there is no search_close() because
of the caching arrangements. */
- handle = search_open(filename, search_type, 0, NULL, NULL);
- if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
- search_error_message);
+ 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;
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;
-uschar *save_host_address = deliver_host_address;
+const uschar *save_host_address = deliver_host_address;
check_host_block cb;
cb.host_name = host_name;
cb.host_address = host_address;
+/*************************************************
+* Check the given host item matches a list *
+*************************************************/
+int
+verify_check_given_host(uschar **listptr, host_item *host)
+{
+return verify_check_this_host(CUSS listptr, NULL, host->name, host->address, NULL);
+}
+
/*************************************************
* Check the remote host matches a list *
*************************************************/
int
verify_check_host(uschar **listptr)
{
-return verify_check_this_host(listptr, sender_host_cache, NULL,
+return verify_check_this_host(CUSS listptr, sender_host_cache, NULL,
(sender_host_address == NULL)? US"" : sender_host_address, NULL);
}
/*************************************************
-* Invert an IP address for a DNS black list *
+* Invert an IP address *
*************************************************/
-/*
+/* Originally just used for DNS xBL lists, now also used for the
+reverse_ip expansion operator.
+
Arguments:
buffer where to put the answer
address the address to invert
*/
-static void
+void
invert_address(uschar *buffer, uschar *address)
{
int bin[4];
}
}
#endif
+
+/* Remove trailing period -- this is needed so that both arbitrary
+dnsbl keydomains and inverted addresses may be combined with the
+same format string, "%s.%s" */
+
+*(--bptr) = 0;
}
* Perform a single dnsbl lookup *
*************************************************/
-/* This function is called from verify_check_dnsbl() below.
+/* This function is called from verify_check_dnsbl() below. It is also called
+recursively from within itself when domain and domain_txt are different
+pointers, in order to get the TXT record from the alternate domain.
Arguments:
- domain the outer dnsbl domain (for debug message)
+ domain the outer dnsbl domain
+ domain_txt alternate domain to lookup TXT record on success; when the
+ same domain is to be used, domain_txt == domain (that is,
+ the pointers must be identical, not just the text)
keydomain the current keydomain (for debug message)
- query the domain to be looked up
- iplist the list of matching IP addresses
+ prepend subdomain to lookup (like keydomain, but
+ reversed if IP address)
+ iplist the list of matching IP addresses, or NULL for "any"
bitmask true if bitmask matching is wanted
- invert_result true if result to be inverted
+ match_type condition for 'succeed' result
+ 0 => Any RR in iplist (=)
+ 1 => No RR in iplist (!=)
+ 2 => All RRs in iplist (==)
+ 3 => Some RRs not in iplist (!==)
+ the two bits are defined as MT_NOT and MT_ALL
defer_return what to return for a defer
Returns: OK if lookup succeeded
*/
static int
-one_check_dnsbl(uschar *domain, uschar *keydomain, uschar *query,
- uschar *iplist, BOOL bitmask, BOOL invert_result, int defer_return)
+one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain,
+ uschar *prepend, uschar *iplist, BOOL bitmask, int match_type,
+ int defer_return)
{
dns_answer dnsa;
dns_scan dnss;
tree_node *t;
dnsbl_cache_block *cb;
int old_pool = store_pool;
+uschar query[256]; /* DNS domain max length */
+
+/* Construct the specific query domainname */
+
+if (!string_format(query, sizeof(query), "%s.%s", prepend, domain))
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
+ "(ignored): %s...", query);
+ return FAIL;
+ }
/* Look for this query in the cache. */
-t = tree_search(dnsbl_cache, query);
+if ( (t = tree_search(dnsbl_cache, query))
+ && (cb = t->data.ptr)->expiry > time(NULL)
+ )
+
+/* Previous lookup was cached */
+
+ {
+ HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
+ }
/* If not cached from a previous lookup, we must do a DNS lookup, and
cache the result in permanent memory. */
-if (t == NULL)
+else
{
+ uint ttl = 3600;
+
store_pool = POOL_PERM;
- /* Set up a tree entry to cache the lookup */
+ if (t)
+ {
+ HDEBUG(D_dnsbl) debug_printf("cached data found but past valid time; ");
+ }
- t = store_get(sizeof(tree_node) + Ustrlen(query));
- Ustrcpy(t->name, query);
- t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
- (void)tree_insertnode(&dnsbl_cache, t);
+ else
+ { /* Set up a tree entry to cache the lookup */
+ t = store_get(sizeof(tree_node) + Ustrlen(query));
+ Ustrcpy(t->name, query);
+ t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
+ (void)tree_insertnode(&dnsbl_cache, t);
+ }
- /* Do the DNS loopup . */
+ /* 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);
Quite apart from one A6 RR generating multiple addresses, there are DNS
lists that return more than one A record, so we must handle multiple
- addresses generated in that way as well. */
+ addresses generated in that way as well.
+
+ Mark the cache entry with the "now" plus the minimum of the address TTLs,
+ or some suitably far-future time if none were found. */
if (cb->rc == DNS_SUCCEED)
{
dns_record *rr;
dns_address **addrp = &(cb->rhs);
for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
+ rr;
rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
{
if (rr->type == T_A)
{
dns_address *da = dns_address_from_rr(&dnsa, rr);
- if (da != NULL)
+ if (da)
{
*addrp = da;
while (da->next != NULL) da = da->next;
addrp = &(da->next);
+ if (ttl > rr->ttl) ttl = rr->ttl;
}
}
}
if (cb->rhs == NULL) cb->rc = DNS_NODATA;
}
+ cb->expiry = time(NULL)+ttl;
store_pool = old_pool;
}
-/* Previous lookup was cached */
-
-else
- {
- HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
- cb = t->data.ptr;
- }
-
/* We now have the result of the DNS lookup, either newly done, or cached
from a previous call. If the lookup succeeded, check against the address
list if there is one. This may be a positive equality list (introduced by
if (iplist != NULL)
{
- int ipsep = ',';
- uschar ip[46];
- uschar *ptr = iplist;
-
- while (string_nextinlist(&ptr, &ipsep, ip, sizeof(ip)) != NULL)
+ for (da = cb->rhs; da != NULL; da = da->next)
{
+ int ipsep = ',';
+ uschar ip[46];
+ const uschar *ptr = iplist;
+ uschar *res;
+
/* Handle exact matching */
+
if (!bitmask)
{
- for (da = cb->rhs; da != NULL; da = da->next)
+ while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
{
if (Ustrcmp(CS da->address, ip) == 0) break;
}
}
+
/* Handle bitmask matching */
+
else
{
int address[4];
ignore IPv6 addresses. The default mask is 0, which always matches.
We change this only for IPv4 addresses in the list. */
- if (host_aton(ip, address) == 1) mask = address[0];
+ if (host_aton(da->address, address) == 1) mask = address[0];
/* Scan the returned addresses, skipping any that are IPv6 */
- for (da = cb->rhs; da != NULL; da = da->next)
+ while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
{
- if (host_aton(da->address, address) != 1) continue;
- if ((address[0] & mask) == mask) break;
+ if (host_aton(ip, address) != 1) continue;
+ if ((address[0] & mask) == address[0]) break;
}
}
- /* Break out if a match has been found */
+ /* If either
+
+ (a) An IP address in an any ('=') list matched, or
+ (b) No IP address in an all ('==') list matched
- if (da != NULL) break;
+ then we're done searching. */
+
+ if (((match_type & MT_ALL) != 0) == (res == NULL)) break;
}
- /* If either
+ /* If da == NULL, either
- (a) No IP address in a positive list matched, or
- (b) An IP address in a negative list did match
+ (a) No IP address in an any ('=') list matched, or
+ (b) An IP address in an all ('==') list didn't match
- then behave as if the DNSBL lookup had not succeeded, i.e. the host is
- not on the list. */
+ so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on
+ the list. */
- if (invert_result != (da == NULL))
+ if ((match_type == MT_NOT || match_type == MT_ALL) != (da == NULL))
{
HDEBUG(D_dnsbl)
{
+ uschar *res = NULL;
+ switch(match_type)
+ {
+ case 0:
+ res = US"was no match";
+ break;
+ case MT_NOT:
+ res = US"was an exclude match";
+ break;
+ case MT_ALL:
+ res = US"was an IP address that did not match";
+ break;
+ case MT_NOT|MT_ALL:
+ res = US"were no IP addresses that did not match";
+ break;
+ }
debug_printf("=> but we are not accepting this block class because\n");
- debug_printf("=> there was %s match for %c%s\n",
- invert_result? "an exclude":"no", bitmask? '&' : '=', iplist);
+ debug_printf("=> there %s for %s%c%s\n",
+ res,
+ ((match_type & MT_ALL) == 0)? "" : "=",
+ bitmask? '&' : '=', iplist);
}
return FAIL;
}
}
- /* Either there was no IP list, or the record matched. Look up a TXT record
- if it hasn't previously been done. */
+ /* Either there was no IP list, or the record matched, implying that the
+ domain is on the list. We now want to find a corresponding TXT record. If an
+ alternate domain is specified for the TXT record, call this function
+ recursively to look that up; this has the side effect of re-checking that
+ there is indeed an A record at the alternate domain. */
+
+ if (domain_txt != domain)
+ return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL,
+ FALSE, match_type, defer_return);
+
+ /* If there is no alternate domain, look up a TXT record in the main domain
+ if it has not previously been cached. */
if (!cb->text_set)
{
If no key is given, what is looked up in the domain is the inverted IP address
of the current client host. If a key is given, it is used to construct the
-domain for the lookup. For example,
+domain for the lookup. For example:
dsn.rfc-ignorant.org/$sender_address_domain
value in $dnslist_text. We also cache everything in a tree, to optimize
multiple lookups.
+The TXT record is normally looked up in the same domain as the A record, but
+when many lists are combined in a single DNS domain, this will not be a very
+specific message. It is possible to specify a different domain for looking up
+TXT records; this is given before the main domain, comma-separated. For
+example:
+
+ dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \
+ socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3
+
+The caching ensures that only one lookup in dnsbl.sorbs.net is done.
+
Note: an address for testing RBL is 192.203.178.39
Note: an address for testing DUL is 192.203.178.4
Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org
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;
-BOOL invert_result = FALSE;
-uschar *list = *listptr;
+const uschar *list = *listptr;
uschar *domain;
uschar *s;
uschar buffer[1024];
-uschar query[256]; /* DNS domain max length */
uschar revadd[128]; /* Long enough for IPv6 address */
/* Indicate that the inverted IP address is not yet set up */
/* In case this is the first time the DNS resolver is being used. */
-dns_init(FALSE, FALSE);
+dns_init(FALSE, FALSE, FALSE); /*XXX dnssec? */
/* Loop through all the domains supplied, until something matches */
while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
{
int rc;
- BOOL frc;
BOOL bitmask = FALSE;
+ int match_type = 0;
+ uschar *domain_txt;
+ uschar *comma;
uschar *iplist;
uschar *key;
/* 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);
}
}
+ /* Check the alternate domain if present */
+
+ if (domain_txt != domain) for (s = domain_txt; *s != 0; s++)
+ {
+ if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_')
+ {
+ log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
+ "strange characters - is this right?", domain_txt);
+ break;
+ }
+ }
+
/* If there is no key string, construct the query by adding the domain name
onto the inverted host address, and perform a single DNS lookup. */
if (key == NULL)
{
- if (sender_host_address == NULL) return FAIL; /* can never match */
- if (revadd[0] == 0) invert_address(revadd, sender_host_address);
- frc = string_format(query, sizeof(query), "%s%s", revadd, domain);
-
- if (!frc)
+ if (where == ACL_WHERE_NOTSMTP_START || where == ACL_WHERE_NOTSMTP)
{
- log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
- "(ignored): %s...", query);
- continue;
+ *log_msgptr = string_sprintf
+ ("cannot test auto-keyed dnslists condition in %s ACL",
+ acl_wherenames[where]);
+ return ERROR;
}
-
- rc = one_check_dnsbl(domain, sender_host_address, query, iplist, bitmask,
- invert_result, defer_return);
-
+ 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);
+ dnslist_domain = string_copy(domain_txt);
+ dnslist_matched = string_copy(sender_host_address);
HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
- sender_host_address, domain);
+ sender_host_address, dnslist_domain);
}
-
if (rc != FAIL) return rc; /* OK or DEFER */
}
BOOL defer = FALSE;
uschar *keydomain;
uschar keybuffer[256];
+ uschar keyrevadd[128];
- while ((keydomain = string_nextinlist(&key, &keysep, keybuffer,
+ while ((keydomain = string_nextinlist(CUSS &key, &keysep, keybuffer,
sizeof(keybuffer))) != NULL)
{
- if (string_is_ip_address(keydomain, NULL) > 0)
- {
- uschar keyrevadd[128];
- invert_address(keyrevadd, keydomain);
- frc = string_format(query, sizeof(query), "%s%s", keyrevadd, domain);
- }
- else
- {
- frc = string_format(query, sizeof(query), "%s.%s", keydomain, domain);
- }
+ uschar *prepend = keydomain;
- if (!frc)
+ if (string_is_ip_address(keydomain, NULL) != 0)
{
- log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
- "(ignored): %s...", query);
- continue;
+ invert_address(keyrevadd, keydomain);
+ prepend = keyrevadd;
}
- rc = one_check_dnsbl(domain, keydomain, query, iplist, bitmask,
- invert_result, defer_return);
+ rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist,
+ bitmask, match_type, defer_return);
if (rc == OK)
{
- dnslist_domain = string_copy(domain);
+ dnslist_domain = string_copy(domain_txt);
+ dnslist_matched = string_copy(keydomain);
HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
- keydomain, domain);
+ keydomain, dnslist_domain);
return OK;
}
return FAIL;
}
+/* vi: aw ai sw=2
+*/
/* End of verify.c */
git://git.exim.org / exim.git / blobdiff