-/* $Cambridge: exim/src/src/verify.c,v 1.5 2004/11/12 16:54:55 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* Copyright (c) The Exim Maintainers 2020 - 2022 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Functions concerned with verifying things. The original code for callout
caching was contributed by Kevin Fleming (but I hacked it around a bit). */
#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_context ctctx;
+uschar ctbuffer[8192];
-/* Structure for caching DNSBL lookups */
-
-typedef struct dnsbl_cache_block {
- dns_address *rhs;
- uschar *text;
- int rc;
- BOOL text_set;
-} dnsbl_cache_block;
-
-
-/* Anchor for DNSBL cache */
-static tree_node *dnsbl_cache = NULL;
+static uschar cutthrough_response(client_conn_ctx *, char, uschar **, int);
*/
static dbdata_callout_cache *
-get_callout_cache_record(open_db *dbm_file, uschar *key, uschar *type,
+get_callout_cache_record(open_db *dbm_file, const uschar *key, uschar *type,
int positive_expire, int negative_expire)
{
BOOL negative;
time_t now;
dbdata_callout_cache *cache_record;
-cache_record = dbfn_read_with_length(dbm_file, key, &length);
-
-if (cache_record == NULL)
+if (!(cache_record = dbfn_read_with_length(dbm_file, key, &length)))
{
- HDEBUG(D_verify) debug_printf("callout cache: no %s record found\n", type);
+ HDEBUG(D_verify) debug_printf_indent("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_indent("callout cache: %s record expired for %s\n", type, key);
return NULL;
}
{
if (length == sizeof(dbdata_callout_cache_obs))
{
- dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache));
+ dbdata_callout_cache * new = store_get(sizeof(dbdata_callout_cache), GET_UNTAINTED);
memcpy(new, cache_record, length);
new->postmaster_stamp = new->random_stamp = new->time_stamp;
cache_record = new;
cache_record->random_result = ccache_unknown;
}
-HDEBUG(D_verify) debug_printf("callout cache: found %s record\n", type);
+HDEBUG(D_verify) debug_printf_indent("callout cache: found %s record for %s\n", type, key);
return cache_record;
}
+/* Check the callout cache.
+Options * pm_mailfrom may be modified by cache partial results.
+
+Return: TRUE if result found
+*/
+
+static BOOL
+cached_callout_lookup(address_item * addr, uschar * address_key,
+ uschar * from_address, int * opt_ptr, uschar ** pm_ptr,
+ int * yield, uschar ** failure_ptr,
+ dbdata_callout_cache * new_domain_record, int * old_domain_res)
+{
+int options = *opt_ptr;
+open_db dbblock;
+open_db *dbm_file = NULL;
+
+/* Open the callout cache database, if it exists, for reading only at this
+stage, unless caching has been disabled. */
+
+if (options & vopt_callout_no_cache)
+ {
+ HDEBUG(D_verify) debug_printf_indent("callout cache: disabled by no_cache\n");
+ }
+else if (!(dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE, TRUE)))
+ {
+ HDEBUG(D_verify) debug_printf_indent("callout cache: not available\n");
+ }
+else
+ {
+ /* 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)
+ {
+ /* 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)
+ {
+ HDEBUG(D_verify)
+ debug_printf_indent("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;
+ *failure_ptr = US"mail";
+ dbfn_close(dbm_file);
+ return TRUE;
+ }
+
+ /* If a previous check on a "random" local part was accepted, we assume
+ that the server does not do any checking on local parts. There is therefore
+ no point in doing the callout, because it will always be successful. If a
+ random check previously failed, arrange not to do it again, but preserve
+ the data in the new record. If a random check is required but hasn't been
+ done, skip the remaining cache processing. */
+
+ if (options & vopt_callout_random) switch(cache_record->random_result)
+ {
+ case ccache_accept:
+ HDEBUG(D_verify)
+ debug_printf_indent("callout cache: domain accepts random addresses\n");
+ *failure_ptr = US"random";
+ dbfn_close(dbm_file);
+ return TRUE; /* Default yield is OK */
+
+ case ccache_reject:
+ HDEBUG(D_verify)
+ debug_printf_indent("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_indent("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,
+ there is again no point in carrying on. If a postmaster check is required,
+ but has not been done before, we are going to have to do a callout, so skip
+ remaining cache processing. */
+
+ if (*pm_ptr)
+ {
+ if (cache_record->postmaster_result == ccache_reject)
+ {
+ setflag(addr, af_verify_pmfail);
+ HDEBUG(D_verify)
+ debug_printf_indent("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_indent("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
+ that the value in the cache record is preserved (with its old timestamp).
+ */
+
+ HDEBUG(D_verify) debug_printf_indent("callout cache: domain accepts RCPT "
+ "TO:<postmaster@domain>\n");
+ *pm_ptr = NULL;
+ new_domain_record->postmaster_result = ccache_accept;
+ new_domain_record->postmaster_stamp = cache_record->postmaster_stamp;
+ }
+ }
+
+ /* We can't give a result based on information about the domain. See if there
+ is an unexpired cache record for this specific address (combined with the
+ sender address if we are doing a recipient callout with a non-empty sender).
+ */
+
+ 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->result == ccache_accept)
+ {
+ HDEBUG(D_verify)
+ debug_printf_indent("callout cache: address record is positive\n");
+ }
+ else
+ {
+ HDEBUG(D_verify)
+ debug_printf_indent("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. */
+
+ dbfn_close(dbm_file);
+ return TRUE;
+ }
+return FALSE;
+}
+
+
+/* Write results to callout cache
+*/
+static void
+cache_callout_write(dbdata_callout_cache * dom_rec, const uschar * domain,
+ int done, dbdata_callout_cache_address * addr_rec, uschar * address_key)
+{
+open_db dbblock;
+open_db *dbm_file = NULL;
+
+/* If we get here with done == TRUE, a successful callout happened, and yield
+will be set OK or FAIL according to the response to the RCPT command.
+Otherwise, we looped through the hosts but couldn't complete the business.
+However, there may be domain-specific information to cache in both cases.
+
+The value of the result field in the new_domain record is ccache_unknown if
+there was an error before or with MAIL FROM:, and errno was not zero,
+implying some kind of I/O error. We don't want to write the cache in that case.
+Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
+
+if (dom_rec->result != ccache_unknown)
+ if (!(dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE, TRUE)))
+ {
+ HDEBUG(D_verify) debug_printf_indent("callout cache: not available\n");
+ }
+ else
+ {
+ (void)dbfn_write(dbm_file, domain, dom_rec,
+ (int)sizeof(dbdata_callout_cache));
+ HDEBUG(D_verify) debug_printf_indent("wrote callout cache domain record for %s:\n"
+ " result=%d postmaster=%d random=%d\n",
+ domain,
+ dom_rec->result,
+ dom_rec->postmaster_result,
+ dom_rec->random_result);
+ }
+
+/* If a definite result was obtained for the callout, cache it unless caching
+is disabled. */
+
+if (done && addr_rec->result != ccache_unknown)
+ {
+ if (!dbm_file)
+ dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE, TRUE);
+ if (!dbm_file)
+ {
+ HDEBUG(D_verify) debug_printf_indent("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_indent("wrote %s callout cache address record for %s\n",
+ addr_rec->result == ccache_accept ? "positive" : "negative",
+ address_key);
+ }
+ }
+
+if (dbm_file) dbfn_close(dbm_file);
+}
+
+
+/* Cutthrough-multi. If the existing cached cutthrough connection matches
+the one we would make for a subsequent recipient, use it. Send the RCPT TO
+and check the result, nonpipelined as it may be wanted immediately for
+recipient-verification.
+
+It seems simpler to deal with this case separately from the main callout loop.
+We will need to remember it has sent, or not, so that rcpt-acl tail code
+can do it there for the non-rcpt-verify case. For this we keep an addresscount.
+
+Return: TRUE for a definitive result for the recipient
+*/
+static int
+cutthrough_multi(address_item * addr, host_item * host_list,
+ transport_feedback * tf, int * yield)
+{
+BOOL done = FALSE;
+
+if (addr->transport == cutthrough.addr.transport)
+ for (host_item * host = host_list; host; host = host->next)
+ if (Ustrcmp(host->address, cutthrough.host.address) == 0)
+ {
+ int host_af;
+ uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
+ int port = 25;
+
+ deliver_host = host->name;
+ deliver_host_address = host->address;
+ deliver_host_port = host->port;
+ deliver_domain = addr->domain;
+ transport_name = addr->transport->name;
+
+ host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
+
+ if ( !smtp_get_interface(tf->interface, host_af, addr, &interface,
+ US"callout")
+ || !smtp_get_port(tf->port, addr, &port, US"callout")
+ )
+ log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
+ addr->message);
+
+ smtp_port_for_connect(host, port);
+
+ if ( ( interface == cutthrough.interface
+ || ( interface
+ && cutthrough.interface
+ && Ustrcmp(interface, cutthrough.interface) == 0
+ ) )
+ && host->port == cutthrough.host.port
+ )
+ {
+ uschar * resp = NULL;
+
+ /* Match! Send the RCPT TO, set done from the response */
+ done =
+ smtp_write_command(&ctctx, SCMD_FLUSH, "RCPT TO:<%.1000s>\r\n",
+ transport_rcpt_address(addr,
+ addr->transport->rcpt_include_affixes)) >= 0
+ && cutthrough_response(&cutthrough.cctx, '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), GET_UNTAINTED);
+ *na = cutthrough.addr;
+ cutthrough.addr = *addr;
+ cutthrough.addr.host_used = &cutthrough.host;
+ cutthrough.addr.next = na;
+
+ cutthrough.nrcpt++;
+ }
+ else
+ {
+ cancel_cutthrough_connection(TRUE, US"recipient rejected");
+ if (!resp || errno == ETIMEDOUT)
+ {
+ HDEBUG(D_verify) debug_printf("SMTP timeout\n");
+ }
+ else if (errno == 0)
+ {
+ if (*resp == 0)
+ Ustrcpy(resp, US"connection dropped");
+
+ addr->message =
+ string_sprintf("response to \"%s\" was: %s",
+ big_buffer, string_printing(resp));
+
+ addr->user_message =
+ string_sprintf("Callout verification failed:\n%s", resp);
+
+ /* Hard rejection ends the process */
+
+ if (resp[0] == '5') /* Address rejected */
+ {
+ *yield = FAIL;
+ done = TRUE;
+ }
+ }
+ }
+ }
+ break; /* host_list */
+ }
+if (!done)
+ cancel_cutthrough_connection(TRUE, US"incompatible connection");
+return done;
+}
+
+
+
+
+/* A rcpt callout, or cached record of one, verified the address.
+Set $domain_data and $local_part_data to detainted versions.
+*/
+static void
+callout_verified_rcpt(const address_item * addr)
+{
+address_item a = {.address = addr->address};
+if (deliver_split_address(&a) != OK) return;
+deliver_localpart_data = string_copy_taint(a.local_part, GET_UNTAINTED);
+deliver_domain_data = string_copy_taint(a.domain, GET_UNTAINTED);
+}
+
+
/*************************************************
* Do callout verification for an address *
*************************************************/
options the verification options - these bits are used:
vopt_is_recipient => this is a recipient address
vopt_callout_no_cache => don't use callout cache
+ vopt_callout_fullpm => if postmaster check, do full one
vopt_callout_random => do the "random" thing
vopt_callout_recipsender => use real sender for recipient
vopt_callout_recippmaster => use postmaster for recipient
+ vopt_callout_hold => lazy close connection
se_mailfrom MAIL FROM address for sender verify; NULL => ""
pm_mailfrom if non-NULL, do the postmaster check with this sender
static int
do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
- int callout, int callout_overall, int callout_connect, int options,
+ int callout, int callout_overall, int callout_connect, int options,
uschar *se_mailfrom, uschar *pm_mailfrom)
{
-BOOL is_recipient = (options & vopt_is_recipient) != 0;
-BOOL callout_no_cache = (options & vopt_callout_no_cache) != 0;
-BOOL callout_random = (options & vopt_callout_random) != 0;
-
int yield = OK;
+int old_domain_cache_result = ccache_accept;
BOOL done = FALSE;
uschar *address_key;
uschar *from_address;
uschar *random_local_part = NULL;
-uschar **failure_ptr = is_recipient?
- &recipient_verify_failure : &sender_verify_failure;
-open_db dbblock;
-open_db *dbm_file = 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;
-host_item *host;
time_t callout_start_time;
new_domain_record.result = ccache_unknown;
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)
+if (options & vopt_is_recipient)
+ if (options & vopt_callout_recipsender)
{
- address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
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) != 0)
+ 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);
- from_address = string_sprintf("postmaster@%s", qualify_domain_sender);
}
- }
+ else
+ {
+ from_address = US"";
+ address_key = addr->address;
+ }
/* For a sender callout, we must adjust the key if the mailfrom address is not
empty. */
else
{
- from_address = (se_mailfrom == NULL)? US"" : se_mailfrom;
- if (from_address[0] != 0)
- address_key = string_sprintf("%s/<%s>", addr->address, from_address);
+ from_address = se_mailfrom ? se_mailfrom : US"";
+ address_key = *from_address
+ ? string_sprintf("%s/<%s>", addr->address, from_address) : addr->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 (cached_callout_lookup(addr, address_key, from_address,
+ &options, &pm_mailfrom, &yield, failure_ptr,
+ &new_domain_record, &old_domain_cache_result))
{
- HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n");
+ cancel_cutthrough_connection(TRUE, US"cache-hit");
+ goto END_CALLOUT;
}
-else if ((dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)) == NULL)
+
+if (!addr->transport)
{
- HDEBUG(D_verify) debug_printf("callout cache: not available\n");
+ HDEBUG(D_verify) debug_printf("cannot callout via null transport\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 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
{
- 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);
+ smtp_transport_options_block *ob =
+ (smtp_transport_options_block *)addr->transport->options_block;
+ smtp_context * sx = NULL;
- /* If an unexpired cache record was found for this domain, see if the callout
- process can be short-circuited. */
+ /* 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 (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);
- if (cache_record != NULL)
+ /* Compile regex' used by client-side smtp */
+
+ smtp_deliver_init();
+
+ /* Default the connect and overall callout timeouts if not set, and record the
+ time we are starting so that we can enforce it. */
+
+ if (callout_overall < 0) callout_overall = 4 * callout;
+ if (callout_connect < 0) callout_connect = callout;
+ callout_start_time = time(NULL);
+
+ /* Before doing a real callout, if this is an SMTP connection, flush the SMTP
+ output because a callout might take some time. When PIPELINING is active and
+ there are many recipients, the total time for doing lots of callouts can add up
+ and cause the client to time out. So in this case we forgo the PIPELINING
+ optimization. */
+
+ if (smtp_out && !f.disable_callout_flush) mac_smtp_fflush();
+
+ clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
+ clearflag(addr, af_verify_nsfail); /* null sender callout flag */
+
+/* cutthrough-multi: if a nonfirst rcpt has the same routing as the first,
+and we are holding a cutthrough conn open, we can just append the rcpt to
+that conn for verification purposes (and later delivery also). Simplest
+coding means skipping this whole loop and doing the append separately. */
+
+ /* Can we re-use an open cutthrough connection? */
+ if ( cutthrough.cctx.sock >= 0
+ && (options & (vopt_callout_recipsender | vopt_callout_recippmaster))
+ == vopt_callout_recipsender
+ && !random_local_part
+ && !pm_mailfrom
+ )
+ done = cutthrough_multi(addr, host_list, tf, &yield);
+
+ /* 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. */
+
+ for (host_item * host = host_list; host && !done; host = host->next)
{
- /* If an early command (up to and including MAIL FROM:<>) was rejected,
- there is no point carrying on. The callout fails. */
+ int host_af;
+ int port = 25;
+ uschar * interface = NULL; /* Outgoing interface to use; NULL => any */
- if (cache_record->result == ccache_reject)
+ if (!host->address)
{
- 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");
- setflag(addr, af_verify_nsfail);
- addr->user_message = US"(result of an earlier callout reused).";
- yield = FAIL;
- *failure_ptr = US"mail";
- goto END_CALLOUT;
+ DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
+ host->name);
+ continue;
}
- /* If a previous check on a "random" local part was accepted, we assume
- that the server does not do any checking on local parts. There is therefore
- no point in doing the callout, because it will always be successful. If a
- random check previously failed, arrange not to do it again, but preserve
- the data in the new record. If a random check is required but hasn't been
- done, skip the remaining cache processing. */
+ /* Check the overall callout timeout */
- if (callout_random) switch(cache_record->random_result)
+ if (time(NULL) - callout_start_time >= callout_overall)
{
- case ccache_accept:
- HDEBUG(D_verify)
- debug_printf("callout cache: domain accepts random addresses\n");
- goto END_CALLOUT; /* 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;
+ HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
break;
+ }
- default:
- HDEBUG(D_verify)
- debug_printf("callout cache: need to check random address handling "
- "(not cached or cache expired)\n");
- goto END_CACHE;
+ /* 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);
+
+ if (!sx) sx = store_get(sizeof(*sx), GET_TAINTED); /* tainted buffers */
+ memset(sx, 0, sizeof(*sx));
+
+ sx->addrlist = sx->first_addr = addr;
+ sx->conn_args.host = host;
+ sx->conn_args.host_af = host_af,
+ sx->port = port;
+ sx->conn_args.interface = interface;
+ sx->helo_data = tf->helo_data;
+ sx->conn_args.tblock = addr->transport;
+ sx->conn_args.sock = -1;
+ 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);
+#ifndef DISABLE_TLS
+ if ( yield == DEFER
+ && addr->basic_errno == ERRNO_TLSFAILURE
+ && ob->tls_tempfail_tryclear
+ && verify_check_given_host(CUSS &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;
}
- /* If a postmaster check is requested, but there was a previous failure,
- there is again no point in carrying on. If a postmaster check is required,
- but has not been done before, we are going to have to do a callout, so skip
- remaining cache processing. */
+ /* If we needed to authenticate, smtp_setup_conn() did that. Copy
+ the AUTH info for logging */
+
+ addr->authenticator = client_authenticator;
+ addr->auth_id = client_authenticated_id;
- if (pm_mailfrom != NULL)
+ 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;
+
+ new_domain_record.result = old_domain_cache_result == ccache_reject_mfnull
+ ? ccache_reject_mfnull : ccache_accept;
+
+ /* Do the random local part check first. Temporarily replace the recipient
+ with the "random" value */
+
+ if (random_local_part)
{
- 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;
- }
- 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;
- }
+ uschar * main_address = addr->address;
+ const uschar * rcpt_domain = addr->domain;
+
+#ifdef SUPPORT_I18N
+ uschar * errstr = NULL;
+ if ( testflag(addr, af_utf8_downcvt)
+ && (rcpt_domain = string_domain_utf8_to_alabel(rcpt_domain,
+ &errstr), errstr)
+ )
+ {
+ addr->message = errstr;
+ errno = ERRNO_EXPANDFAIL;
+ setflag(addr, af_verify_nsfail);
+ done = FALSE;
+ rcpt_domain = US""; /*XXX errorhandling! */
+ }
+#endif
- /* If cache says OK, set pm_mailfrom NULL to prevent a redundant
- postmaster check if the address itself has to be checked. Also ensure
- that the value in the cache record is preserved (with its old timestamp).
- */
+ /* This would be ok for 1st rcpt of a cutthrough (the case handled here;
+ subsequents are done in cutthrough_multi()), but no way to
+ handle a subsequent because of the RSET vaporising the MAIL FROM.
+ So refuse to support any. Most cutthrough use will not involve
+ random_local_part, so no loss. */
+ cancel_cutthrough_connection(TRUE, US"random-recipient");
- 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;
- }
- }
+ addr->address = string_sprintf("%s@%.1000s",
+ random_local_part, rcpt_domain);
+ done = FALSE;
- /* We can't give a result based on information about the domain. See if there
- is an unexpired cache record for this specific address (combined with the
- sender address if we are doing a recipient callout with a non-empty sender).
- */
+ /* If accepted, we aren't going to do any further tests below.
+ Otherwise, cache a real negative response, and get back to the right
+ state to send RCPT. Unless there's some problem such as a dropped
+ connection, we expect to succeed, because the commands succeeded above.
+ However, some servers drop the connection after responding to an
+ invalid recipient, so on (any) error we drop and remake the connection.
+ XXX We don't care about that for postmaster_full. Should we?
+
+ XXX could we add another flag to the context, and have the common
+ code emit the RSET too? Even pipelined after the RCPT...
+ Then the main-verify call could use it if there's to be a subsequent
+ postmaster-verify.
+ The sync_responses() would need to be taught about it and we'd
+ need another return code filtering out to here.
+
+ Avoid using a SIZE option on the MAIL for all random-rcpt checks.
+ */
- 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);
+ sx->avoid_option = OPTION_SIZE;
- if (cache_address_record != NULL)
- {
- if (cache_address_record->result == ccache_accept)
- {
- HDEBUG(D_verify)
- debug_printf("callout cache: address record is positive\n");
+ /* Remember when we last did a random test */
+ new_domain_record.random_stamp = time(NULL);
+
+ if (smtp_write_mail_and_rcpt_cmds(sx, &yield) == 0)
+ switch(addr->transport_return)
+ {
+ case PENDING_OK: /* random was accepted, unfortunately */
+ new_domain_record.random_result = ccache_accept;
+ yield = OK; /* Only usable verify result we can return */
+ done = TRUE;
+ *failure_ptr = US"random";
+ goto no_conn;
+ case FAIL: /* rejected: the preferred result */
+ new_domain_record.random_result = ccache_reject;
+ sx->avoid_option = 0;
+
+ /* Between each check, issue RSET, because some servers accept only
+ one recipient after MAIL FROM:<>.
+ XXX We don't care about that for postmaster_full. Should we? */
+
+ if ((done =
+ smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0 &&
+ smtp_read_response(sx, 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;
+#ifndef DISABLE_TLS
+ tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
+#endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
+ (void)close(sx->cctx.sock);
+ sx->cctx.sock = -1;
+#ifndef DISABLE_EVENT
+ (void) event_raise(addr->transport->event_action,
+ US"tcp:close", NULL, NULL);
+#endif
+ addr->address = main_address;
+ addr->transport_return = PENDING_DEFER;
+ sx->first_addr = sx->sync_addr = addr;
+ sx->ok = FALSE;
+ sx->send_rset = TRUE;
+ sx->completed_addr = FALSE;
+ goto tls_retry_connection;
+ case DEFER: /* 4xx response to random */
+ break; /* Just to be clear. ccache_unknown, !done. */
+ }
+
+ /* Re-setup for main verify, or for the error message when failing */
+ addr->address = main_address;
+ addr->transport_return = PENDING_DEFER;
+ sx->first_addr = sx->sync_addr = addr;
+ sx->ok = FALSE;
+ sx->send_rset = TRUE;
+ sx->completed_addr = FALSE;
}
else
+ done = TRUE;
+
+ /* Main verify. For rcpt-verify use SIZE if we know it and we're not cacheing;
+ for sndr-verify never use it. */
+
+ if (done)
{
- 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;
+ if (!(options & vopt_is_recipient && options & vopt_callout_no_cache))
+ sx->avoid_option = OPTION_SIZE;
+
+ done = FALSE;
+ switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
+ {
+ case 0: switch(addr->transport_return) /* ok so far */
+ {
+ case PENDING_OK: done = TRUE;
+ new_address_record.result = ccache_accept;
+ break;
+ case FAIL: done = TRUE;
+ yield = FAIL;
+ *failure_ptr = US"recipient";
+ new_address_record.result = ccache_reject;
+ break;
+ default: break;
+ }
+ break;
+
+ case -1: /* MAIL response error */
+ *failure_ptr = US"mail";
+ if (errno == 0 && sx->buffer[0] == '5')
+ {
+ setflag(addr, af_verify_nsfail);
+ if (from_address[0] == 0)
+ new_domain_record.result = ccache_reject_mfnull;
+ }
+ break;
+ /* non-MAIL read i/o error */
+ /* non-MAIL response timeout */
+ /* internal error; channel still usable */
+ default: break; /* transmit failed */
+ }
}
- goto END_CALLOUT;
- }
-
- /* Close the cache database while we actually do the callout for real. */
- END_CACHE:
- dbfn_close(dbm_file);
- dbm_file = NULL;
- }
+ addr->auth_sndr = client_authenticated_sender;
-/* 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. */
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
-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);
- }
+ /* Do postmaster check if requested; if a full check is required, we
+ check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
-/* Default the connect and overall callout timeouts if not set, and record the
-time we are starting so that we can enforce it. */
+ if (done && pm_mailfrom)
+ {
+ /* Could possibly shift before main verify, just above, and be ok
+ for cutthrough. But no way to handle a subsequent rcpt, so just
+ refuse any */
+ cancel_cutthrough_connection(TRUE, US"postmaster verify");
+ HDEBUG(D_acl|D_v) debug_printf_indent("Cutthrough cancelled by presence of postmaster verify\n");
-if (callout_overall < 0) callout_overall = 4 * callout;
-if (callout_connect < 0) callout_connect = callout;
-callout_start_time = time(NULL);
+ done = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0
+ && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', callout);
-/* Now make connections to the hosts and do real callouts. The list of hosts
-is passed in as an argument. */
+ if (done)
+ {
+ uschar * main_address = addr->address;
+
+ /*XXX oops, affixes */
+ addr->address = string_sprintf("postmaster@%.1000s", addr->domain);
+ addr->transport_return = PENDING_DEFER;
+
+ sx->from_addr = pm_mailfrom;
+ sx->first_addr = sx->sync_addr = addr;
+ sx->ok = FALSE;
+ sx->send_rset = TRUE;
+ sx->completed_addr = FALSE;
+ sx->avoid_option = OPTION_SIZE;
+
+ if( smtp_write_mail_and_rcpt_cmds(sx, &yield) == 0
+ && addr->transport_return == PENDING_OK
+ )
+ done = TRUE;
+ else
+ done = (options & vopt_callout_fullpm) != 0
+ && smtp_write_command(sx, SCMD_FLUSH,
+ "RCPT TO:<postmaster>\r\n") >= 0
+ && smtp_read_response(sx, 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 = US"response to \"EHLO\" did not include SMTPUTF8";
+ addr->user_message = acl_where == ACL_WHERE_RCPT
+ ? US"533 no support for internationalised mailbox name"
+ : US"550 mailbox unavailable";
+ yield = FAIL;
+ done = TRUE;
+ }
+ break;
+#endif
+ case ECONNREFUSED:
+ sx->send_quit = FALSE;
+ break;
+
+ case 0:
+ if (*sx->buffer == 0) Ustrcpy(sx->buffer, US"connection dropped");
+
+ /*XXX test here is ugly; seem to have a split of responsibility for
+ building this message. Need to rationalise. Where is it done
+ before here, and when not?
+ Not == 5xx resp to MAIL on main-verify
+ */
+ if (!addr->message) addr->message =
+ string_sprintf("response to \"%s\" was: %s",
+ big_buffer, string_printing(sx->buffer));
+
+ /* RFC 5321 section 4.2: the text portion of the response may have only
+ HT, SP, Printable US-ASCII. Deal with awkward chars by cutting the
+ received message off before passing it onward. Newlines are ok; they
+ just become a multiline response (but wrapped in the error code we
+ produce). */
+
+ for (uschar * s = sx->buffer;
+ *s && s < sx->buffer + sizeof(sx->buffer);
+ s++)
+ {
+ uschar c = *s;
+ if (c != '\t' && c != '\n' && (c < ' ' || c > '~'))
+ {
+ if (s - sx->buffer < sizeof(sx->buffer) - 12)
+ memcpy(s, "(truncated)", 12);
+ else
+ *s = '\0';
+ break;
+ }
+ }
+ 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;
+ }
-for (host = host_list; host != NULL && !done; host = host->next)
- {
- smtp_inblock inblock;
- smtp_outblock outblock;
- int host_af;
- int port = 25;
- uschar *helo = US"HELO";
- uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
- uschar inbuffer[4096];
- uschar outbuffer[1024];
- uschar responsebuffer[4096];
+ /* End the SMTP conversation and close the connection. */
- clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
- clearflag(addr, af_verify_nsfail); /* null sender callout flag */
+ /* Cutthrough - on a successful connect and recipient-verify with
+ use-sender and we are 1st rcpt and have no cutthrough conn so far
+ here is where we want to leave the conn open. Ditto for a lazy-close
+ verify. */
- /* Skip this host if we don't have an IP address for it. */
+ if (cutthrough.delivery)
+ {
+ if (addr->transport->filter_command)
+ {
+ cutthrough.delivery= FALSE;
+ HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of transport filter\n");
+ }
+#ifndef DISABLE_DKIM
+ /* DKIM signing needs to add a header after seeing the whole body, so we cannot just copy
+ body bytes to the outbound as they are received, which is the intent of cutthrough. */
+ if (ob->dkim.dkim_domain)
+ {
+ cutthrough.delivery= FALSE;
+ HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
+ }
+#endif
+#ifdef EXPERIMENTAL_ARC
+ if (ob->arc_sign)
+ {
+ cutthrough.delivery= FALSE;
+ HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of ARC signing\n");
+ }
+#endif
+ }
- if (host->address == NULL)
- {
- DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
- host->name);
- continue;
- }
+ if ( (cutthrough.delivery || options & vopt_callout_hold)
+ && rcpt_count == 1
+ && done
+ && yield == OK
+ && (options & (vopt_callout_recipsender|vopt_callout_recippmaster|vopt_success_on_redirect))
+ == vopt_callout_recipsender
+ && !random_local_part
+ && !pm_mailfrom
+ && cutthrough.cctx.sock < 0
+ && !sx->lmtp
+ )
+ {
+ HDEBUG(D_acl|D_v) debug_printf_indent("holding verify callout open for %s\n",
+ cutthrough.delivery
+ ? "cutthrough delivery" : "potential further verifies and delivery");
+
+ cutthrough.callout_hold_only = !cutthrough.delivery;
+ cutthrough.is_tls = tls_out.active.sock >= 0;
+ /* We assume no buffer in use in the outblock */
+ cutthrough.cctx = sx->cctx;
+ cutthrough.nrcpt = 1;
+ cutthrough.transport = addr->transport->name;
+ cutthrough.interface = interface;
+ cutthrough.snd_port = sending_port;
+ cutthrough.peer_options = smtp_peer_options;
+ cutthrough.host = *host;
+ {
+ int oldpool = store_pool;
+ store_pool = POOL_PERM;
+ cutthrough.snd_ip = string_copy(sending_ip_address);
+ cutthrough.host.name = string_copy(host->name);
+ cutthrough.host.address = string_copy(host->address);
+ store_pool = oldpool;
+ }
+
+ /* Save the address_item and parent chain for later logging */
+ cutthrough.addr = *addr;
+ cutthrough.addr.next = NULL;
+ cutthrough.addr.host_used = &cutthrough.host;
+ for (address_item * caddr = &cutthrough.addr, * parent = addr->parent;
+ parent;
+ caddr = caddr->parent, parent = parent->parent)
+ *(caddr->parent = store_get(sizeof(address_item), GET_UNTAINTED)) = *parent;
+
+ ctctx.outblock.buffer = ctbuffer;
+ ctctx.outblock.buffersize = sizeof(ctbuffer);
+ ctctx.outblock.ptr = ctbuffer;
+ /* ctctx.outblock.cmd_count = 0; ctctx.outblock.authenticating = FALSE; */
+ ctctx.outblock.cctx = &cutthrough.cctx;
+ }
+ else
+ {
+ /* Ensure no cutthrough on multiple verifies that were incompatible */
+ if (options & vopt_callout_recipsender)
+ cancel_cutthrough_connection(TRUE, US"not usable for cutthrough");
+ if (sx->send_quit)
+ if (smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n") != -1)
+ /* Wait a short time for response, and discard it */
+ smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
+
+ if (sx->cctx.sock >= 0)
+ {
+#ifndef DISABLE_TLS
+ if (sx->cctx.tls_ctx)
+ {
+ tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
+ sx->cctx.tls_ctx = NULL;
+ }
+#endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
+ (void)close(sx->cctx.sock);
+ sx->cctx.sock = -1;
+ smtp_debug_cmd_report();
+#ifndef DISABLE_EVENT
+ (void) event_raise(addr->transport->event_action, US"tcp:close", NULL, NULL);
+#endif
+ }
+ }
- /* Check the overall callout timeout */
+ if (!done || yield != OK)
+ addr->message = string_sprintf("%s [%s] : %s", host->name, host->address,
+ addr->message);
+ } /* Loop through all hosts, while !done */
+ }
- if (time(NULL) - callout_start_time >= callout_overall)
- {
- HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
- break;
- }
+/* 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. */
- /* Set IPv4 or IPv6 */
+if (!(options & vopt_callout_no_cache))
+ cache_callout_write(&new_domain_record, addr->domain,
+ done, &new_address_record, address_key);
- host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
+/* 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. */
- /* 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)
+ {
+ uschar * dullmsg = string_sprintf("Could not complete %s verify callout",
+ options & vopt_is_recipient ? "recipient" : "sender");
+ yield = DEFER;
- 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;
+ addr->message = host_list->next || !addr->message
+ ? dullmsg : string_sprintf("%s: %s", dullmsg, addr->message);
- /* Set HELO string according to the protocol */
+ addr->user_message = smtp_return_error_details
+ ? string_sprintf("%s for <%s>.\n"
+ "The mail server(s) for the domain may be temporarily unreachable, or\n"
+ "they may be permanently unreachable from this server. In the latter case,\n%s",
+ dullmsg, addr->address,
+ options & vopt_is_recipient
+ ? "the address will never be accepted."
+ : "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;
- if (Ustrcmp(tf->protocol, "lmtp") == 0) helo = US"LHLO";
+ /* Force a specific error code */
- HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
+ addr->basic_errno = ERRNO_CALLOUTDEFER;
+ }
- /* Set up the buffer for reading SMTP response packets. */
+/* Come here from within the cache-reading code on fast-track exit. */
- inblock.buffer = inbuffer;
- inblock.buffersize = sizeof(inbuffer);
- inblock.ptr = inbuffer;
- inblock.ptrend = inbuffer;
+END_CALLOUT:
+tls_modify_variables(&tls_in); /* return variables to inbound values */
+return yield;
+}
- /* Set up the buffer for holding SMTP commands while pipelining */
- outblock.buffer = outbuffer;
- outblock.buffersize = sizeof(outbuffer);
- outblock.ptr = outbuffer;
- outblock.cmd_count = 0;
- outblock.authenticating = FALSE;
- /* Connect to the host; on failure, just loop for the next one, but we
- set the error for the last one. Use the callout_connect timeout. */
+/* 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;
- 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;
- }
+/* 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;
+}
- /* 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. */
- Ustrcpy(big_buffer, "initial connection");
- done =
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+/* Send given number of bytes from the buffer */
+static BOOL
+cutthrough_send(int n)
+{
+if(cutthrough.cctx.sock < 0)
+ return TRUE;
+
+if(
+#ifndef DISABLE_TLS
+ cutthrough.is_tls
+ ? tls_write(cutthrough.cctx.tls_ctx, ctctx.outblock.buffer, n, FALSE)
+ :
+#endif
+ send(cutthrough.cctx.sock, ctctx.outblock.buffer, n, 0) > 0
+ )
+{
+ transport_count += n;
+ ctctx.outblock.ptr= ctctx.outblock.buffer;
+ return TRUE;
+}
- smtp_write_command(&outblock, FALSE, "%s %s\r\n", helo,
- smtp_active_hostname) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+HDEBUG(D_transport|D_acl) debug_printf_indent("cutthrough_send failed: %s\n", strerror(errno));
+return FALSE;
+}
- smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n",
- from_address) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
- /* 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. */
- if (!done)
- {
- *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;
- }
- }
+static BOOL
+_cutthrough_puts(uschar * cp, int n)
+{
+while(n--)
+ {
+ if(ctctx.outblock.ptr >= ctctx.outblock.buffer+ctctx.outblock.buffersize)
+ if(!cutthrough_send(ctctx.outblock.buffersize))
+ return FALSE;
+
+ *ctctx.outblock.ptr++ = *cp++;
+ }
+return TRUE;
+}
- /* 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:<>. */
+/* Buffered output of counted data block. Return boolean success */
+static BOOL
+cutthrough_puts(uschar * cp, int n)
+{
+if (cutthrough.cctx.sock < 0) return TRUE;
+if (_cutthrough_puts(cp, n)) return TRUE;
+cancel_cutthrough_connection(TRUE, US"transmit failed");
+return FALSE;
+}
- else
- {
- new_domain_record.result = ccache_accept;
+void
+cutthrough_data_puts(uschar * cp, int n)
+{
+if (cutthrough.delivery) (void) cutthrough_puts(cp, n);
+return;
+}
- /* Do the random local part check first */
- if (random_local_part != NULL)
- {
- uschar randombuffer[1024];
- BOOL random_ok =
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part,
- addr->domain) >= 0 &&
- smtp_read_response(&inblock, randombuffer,
- sizeof(randombuffer), '2', callout);
+static BOOL
+_cutthrough_flush_send(void)
+{
+int n = ctctx.outblock.ptr - ctctx.outblock.buffer;
- /* Remember when we last did a random test */
+if(n>0)
+ if(!cutthrough_send(n))
+ return FALSE;
+return TRUE;
+}
- new_domain_record.random_stamp = time(NULL);
- /* If accepted, we aren't going to do any further tests below. */
+/* Send out any bufferred output. Return boolean success. */
+BOOL
+cutthrough_flush_send(void)
+{
+if (_cutthrough_flush_send()) return TRUE;
+cancel_cutthrough_connection(TRUE, US"transmit failed");
+return FALSE;
+}
- if (random_ok)
- {
- new_domain_record.random_result = ccache_accept;
- }
- /* Otherwise, cache a real negative response, and get back to the right
- state to send RCPT. Unless there's some problem such as a dropped
- connection, we expect to succeed, because the commands succeeded above. */
+static BOOL
+cutthrough_put_nl(void)
+{
+return cutthrough_puts(US"\r\n", 2);
+}
- 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) &&
+void
+cutthrough_data_put_nl(void)
+{
+cutthrough_data_puts(US"\r\n", 2);
+}
- smtp_write_command(&outblock, FALSE, "MAIL FROM:<>\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
- }
- else done = FALSE; /* Some timeout/connection problem */
- } /* Random check */
- /* If the host is accepting all local parts, as determined by the "random"
- check, we don't need to waste time doing any further checking. */
+/* Get and check response from cutthrough target */
+static uschar
+cutthrough_response(client_conn_ctx * cctx, char expect, uschar ** copy, int timeout)
+{
+smtp_context sx = {0};
+uschar inbuffer[4096];
+uschar responsebuffer[4096];
+
+sx.inblock.buffer = inbuffer;
+sx.inblock.buffersize = sizeof(inbuffer);
+sx.inblock.ptr = inbuffer;
+sx.inblock.ptrend = inbuffer;
+sx.inblock.cctx = cctx;
+if(!smtp_read_response(&sx, responsebuffer, sizeof(responsebuffer), expect, timeout))
+ cancel_cutthrough_connection(TRUE, US"target timeout on read");
+
+if(copy)
+ {
+ uschar * cp;
+ *copy = cp = string_copy(responsebuffer);
+ /* Trim the trailing end of line */
+ cp += Ustrlen(responsebuffer);
+ if(cp > *copy && cp[-1] == '\n') *--cp = '\0';
+ if(cp > *copy && cp[-1] == '\r') *--cp = '\0';
+ }
- if (new_domain_record.random_result != ccache_accept && done)
- {
- done =
- smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
- addr->address) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
+return responsebuffer[0];
+}
- 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;
- }
- /* Do postmaster check if requested */
+/* Negotiate dataphase with the cutthrough target, returning success boolean */
+BOOL
+cutthrough_predata(void)
+{
+if(cutthrough.cctx.sock < 0 || cutthrough.callout_hold_only)
+ return FALSE;
- if (done && pm_mailfrom != NULL)
- {
- done =
- smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout) &&
-
- smtp_write_command(&outblock, FALSE,
- "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout) &&
-
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout);
-
- new_domain_record.postmaster_stamp = time(NULL);
-
- if (done)
- new_domain_record.postmaster_result = ccache_accept;
- else if (errno == 0 && responsebuffer[0] == '5')
- {
- *failure_ptr = US"postmaster";
- setflag(addr, af_verify_pmfail);
- new_domain_record.postmaster_result = ccache_reject;
- }
- }
- } /* Random not accepted */
- } /* MAIL FROM:<> accepted */
+smtp_debug_cmd(US"DATA", 0);
+cutthrough_puts(US"DATA\r\n", 6);
+cutthrough_flush_send();
- /* 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
+/* Assume nothing buffered. If it was it gets ignored. */
+return cutthrough_response(&cutthrough.cctx, '3', NULL, CUTTHROUGH_DATA_TIMEOUT) == '3';
+}
- Set up different error texts for logging and for sending back to the caller
- as an SMTP response. Log in all cases, using a one-line format. For sender
- callouts, give a full response to the caller, but for recipient callouts,
- don't give the IP address because this may be an internal host whose identity
- is not to be widely broadcast. */
- if (!done)
- {
- if (errno == ETIMEDOUT)
- {
- HDEBUG(D_verify) debug_printf("SMTP timeout\n");
- }
- else if (errno == 0)
- {
- if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped");
+/* tctx arg only to match write_chunk() */
+static BOOL
+cutthrough_write_chunk(transport_ctx * tctx, uschar * s, int len)
+{
+uschar * s2;
+while(s && (s2 = Ustrchr(s, '\n')))
+ {
+ if(!cutthrough_puts(s, s2-s) || !cutthrough_put_nl())
+ return FALSE;
+ s = s2+1;
+ }
+return TRUE;
+}
- addr->message =
- string_sprintf("response to \"%s\" from %s [%s] was: %s",
- big_buffer, host->name, host->address,
- string_printing(responsebuffer));
- addr->user_message = is_recipient?
- string_sprintf("Callout verification failed:\n%s", responsebuffer)
- :
- string_sprintf("Called: %s\nSent: %s\nResponse: %s",
- host->address, big_buffer, responsebuffer);
+/* 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;
- /* Hard rejection ends the process */
+if(cutthrough.cctx.sock < 0 || cutthrough.callout_hold_only)
+ return FALSE;
- if (responsebuffer[0] == '5') /* Address rejected */
- {
- yield = FAIL;
- done = TRUE;
- }
- }
- }
+/* 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");
- /* End the SMTP conversation and close the connection. */
+tctx.u.fd = cutthrough.cctx.sock;
+tctx.tblock = cutthrough.addr.transport;
+tctx.addr = &cutthrough.addr;
+tctx.check_string = US".";
+tctx.escape_string = US"..";
+/*XXX check under spool_files_wireformat. Might be irrelevant */
+tctx.options = topt_use_crlf;
- (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
- close(inblock.sock);
- } /* Loop through all hosts, while !done */
+if (!transport_headers_send(&tctx, &cutthrough_write_chunk))
+ return FALSE;
-/* 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.
+HDEBUG(D_acl) debug_printf_indent("----------- done cutthrough headers send ------------\n");
+return TRUE;
+}
-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. */
-if (!callout_no_cache && new_domain_record.result != ccache_unknown)
+static void
+close_cutthrough_connection(const uschar * why)
+{
+int fd = cutthrough.cctx.sock;
+if(fd >= 0)
{
- 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
+ /* 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.
+ */
+ client_conn_ctx tmp_ctx = cutthrough.cctx;
+ ctctx.outblock.ptr = ctbuffer;
+ smtp_debug_cmd(US"QUIT", 0);
+ _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */
+ _cutthrough_flush_send();
+ cutthrough.cctx.sock = -1; /* avoid recursion via read timeout */
+ cutthrough.nrcpt = 0; /* permit re-cutthrough on subsequent message */
+
+ /* Wait a short time for response, and discard it */
+ cutthrough_response(&tmp_ctx, '2', NULL, 1);
+
+#ifndef DISABLE_TLS
+ if (cutthrough.is_tls)
{
- (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);
+ tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
+ cutthrough.cctx.tls_ctx = NULL;
+ cutthrough.is_tls = FALSE;
}
+#endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
+ (void)close(fd);
+ smtp_debug_cmd_report();
+ HDEBUG(D_acl) debug_printf_indent("----------- cutthrough shutdown (%s) ------------\n", why);
}
+ctctx.outblock.ptr = ctbuffer;
+}
-/* If a definite result was obtained for the callout, cache it unless caching
-is disabled. */
+void
+cancel_cutthrough_connection(BOOL close_noncutthrough_verifies, const uschar * why)
+{
+if (cutthrough.delivery || close_noncutthrough_verifies)
+ close_cutthrough_connection(why);
+cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
+}
-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)
- {
- HDEBUG(D_verify) debug_printf("no callout cache available\n");
- }
- else
- {
- (void)dbfn_write(dbm_file, address_key, &new_address_record,
- (int)sizeof(dbdata_callout_cache_address));
- HDEBUG(D_verify) debug_printf("wrote %s callout cache address record\n",
- (new_address_record.result == ccache_accept)? "positive" : "negative");
- }
- }
- } /* done */
-/* 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. */
+void
+release_cutthrough_connection(const uschar * why)
+{
+if (cutthrough.cctx.sock < 0) return;
+HDEBUG(D_acl) debug_printf_indent("release cutthrough conn: %s\n", why);
+cutthrough.cctx.sock = -1;
+cutthrough.cctx.tls_ctx = NULL;
+cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
+}
-else /* !done */
- {
- uschar *dullmsg = string_sprintf("Could not complete %s verify callout",
- is_recipient? "recipient" : "sender");
- yield = DEFER;
- if (host_list->next != NULL || addr->message == NULL) addr->message = dullmsg;
- addr->user_message = (!smtp_return_error_details)? dullmsg :
- 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.");
- /* Force a specific error code */
+/* 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;
+HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> .\n");
+
+/* Assume data finshed with new-line */
+if( !cutthrough_puts(US".", 1)
+ || !cutthrough_put_nl()
+ || !cutthrough_flush_send()
+ )
+ return cutthrough.addr.message;
+
+res = cutthrough_response(&cutthrough.cctx, '2', &cutthrough.addr.message,
+ CUTTHROUGH_DATA_TIMEOUT);
+for (address_item * addr = &cutthrough.addr; addr; addr = addr->next)
+ {
+ addr->message = cutthrough.addr.message;
+ switch(res)
+ {
+ case '2':
+ delivery_log(LOG_MAIN, addr, (int)'>', NULL);
+ close_cutthrough_connection(US"delivered");
+ break;
- addr->basic_errno = ERRNO_CALLOUTDEFER;
- }
+ case '4':
+ delivery_log(LOG_MAIN, addr, 0,
+ US"tmp-reject from cutthrough after DATA:");
+ break;
-/* Come here from within the cache-reading code on fast-track exit. */
+ case '5':
+ delivery_log(LOG_MAIN|LOG_REJECT, addr, 0,
+ US"rejected after DATA:");
+ break;
-END_CALLOUT:
-if (dbm_file != NULL) dbfn_close(dbm_file);
-return yield;
+ default:
+ break;
+ }
+ }
+return cutthrough.addr.message;
}
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;
+ vaddr->prop.variables = NULL;
+ tree_dup((tree_node **)&vaddr->prop.variables, addr->prop.variables);
+ copyflag(vaddr, addr, af_pass_message);
}
return yield;
}
+/**************************************************
+* printf that automatically handles TLS if needed *
+***************************************************/
+
+/* This function is used by verify_address() as a substitute for all fprintf()
+calls; a direct fprintf() will not produce output in a TLS SMTP session, such
+as a response to an EXPN command. smtp_in.c makes smtp_printf available but
+that assumes that we always use the smtp_out FILE* when not using TLS or the
+ssl buffer when we are. Instead we take a FILE* parameter and check to see if
+that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
+fprintf().
+
+Arguments:
+ f the candidate FILE* to write to
+ format format string
+ ... optional arguments
+
+Returns:
+ nothing
+*/
+
+static void PRINTF_FUNCTION(2,3)
+respond_printf(FILE *f, const char *format, ...)
+{
+va_list ap;
+
+va_start(ap, format);
+if (smtp_out && (f == smtp_out))
+ smtp_vprintf(format, FALSE, ap);
+else
+ vfprintf(f, format, ap);
+va_end(ap);
+}
+
+
+
/*************************************************
* Verify an email address *
*************************************************/
Arguments:
vaddr contains the address to verify; the next field in this block
must be NULL
- f if not NULL, write the result to this file
+ fp if not NULL, write the result to this file
options various option bits:
vopt_fake_sender => this sender verify is not for the real
sender (it was verify=sender=xxxx or an address from a
rewriting and messages from callouts
vopt_qualify => qualify an unqualified address; else error
vopt_expn => called from SMTP EXPN command
+ vopt_success_on_redirect => when a new address is generated
+ the verification instantly succeeds
These ones are used by do_callout() -- the options variable
is passed to it.
+ vopt_callout_fullpm => if postmaster check, do full one
vopt_callout_no_cache => don't use callout cache
vopt_callout_random => do the "random" thing
vopt_callout_recipsender => use real sender for recipient
for individual commands
callout_overall if > 0, gives overall timeout for the callout function;
if < 0, a default is used (see do_callout())
- callout_connect the connection timeout for callouts
+ callout_connect the connection timeout for callouts
se_mailfrom when callout is requested to verify a sender, use this
in MAIL FROM; NULL => ""
pm_mailfrom when callout is requested, if non-NULL, do the postmaster
*/
int
-verify_address(address_item *vaddr, FILE *f, int options, int callout,
- int callout_overall, int callout_connect, uschar *se_mailfrom,
+verify_address(address_item * vaddr, FILE * fp, int options, int callout,
+ int callout_overall, int callout_connect, uschar * se_mailfrom,
uschar *pm_mailfrom, BOOL *routed)
{
BOOL allok = TRUE;
-BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0);
-BOOL is_recipient = (options & vopt_is_recipient) != 0;
+BOOL full_info = fp ? debug_selector != 0 : FALSE;
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;
+int verify_type = expn ? v_expn :
+ f.address_test_mode ? v_none :
+ 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 (parse_find_at(address) == NULL)
{
- if ((options & vopt_qualify) == 0)
+ if (!(options & vopt_qualify))
{
- if (f != NULL)
- fprintf(f, "%sA domain is required for \"%s\"%s\n", ko_prefix, address,
- cr);
- *failure_ptr = US"qualify";
+ if (fp)
+ respond_printf(fp, "%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);
+ /* deconst ok as address was not const */
+ address = US rewrite_address_qualify(address, options & vopt_is_recipient);
}
DEBUG(D_verify)
{
debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
- debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address);
+ debug_printf("%s %s\n", f.address_test_mode? "Testing" : "Verifying", address);
}
/* Rewrite and report on it. Clear the domain and local part caches - these
may have been set by domains and local part tests during an ACL. */
-if (global_rewrite_rules != NULL)
+if (global_rewrite_rules)
{
uschar *old = address;
- address = rewrite_address(address, is_recipient, FALSE,
+ /* deconst ok as address was not const */
+ address = US rewrite_address(address, options & vopt_is_recipient, FALSE,
global_rewrite_rules, rewrite_existflags);
if (address != old)
{
- for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0;
- for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0;
- if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address);
+ for (int i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0;
+ for (int i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0;
+ if (fp && !expn) fprintf(fp, "Address rewritten as: %s\n", address);
}
}
/* If this is the real sender address, we must update sender_address at
this point, because it may be referred to in the routers. */
-if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0)
+if (!(options & (vopt_fake_sender|vopt_is_recipient)))
sender_address = address;
/* If the address was rewritten to <> no verification can be done, and we have
to return OK. This rewriting is permitted only for sender addresses; for other
addresses, such rewriting fails. */
-if (address[0] == 0) return OK;
+if (!address[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;
if (testflag(addr, af_pfr))
{
allok = FALSE;
- if (f != NULL)
+ if (fp)
{
BOOL allow;
if (addr->address[0] == '>')
{
allow = testflag(addr, af_allow_reply);
- fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1);
+ fprintf(fp, "%s -> mail %s", addr->parent->address, addr->address + 1);
}
else
{
- allow = (addr->address[0] == '|')?
- testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file);
- fprintf(f, "%s -> %s", addr->parent->address, addr->address);
+ allow = addr->address[0] == '|'
+ ? testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file);
+ fprintf(fp, "%s -> %s", addr->parent->address, addr->address);
}
if (addr->basic_errno == ERRNO_BADTRANSPORT)
- fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n"
+ fprintf(fp, "\n*** Error in setting up pipe, file, or autoreply:\n"
"%s\n", addr->message);
else if (allow)
- fprintf(f, "\n transport = %s\n", addr->transport->name);
+ fprintf(fp, "\n transport = %s\n", addr->transport->name);
else
- fprintf(f, " *** forbidden ***\n");
+ fprintf(fp, " *** forbidden ***\n");
}
continue;
}
/* 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
$sender_address to <> because that is what it will be if we were trying to
send a bounce to the sender. */
- if (routed != NULL) *routed = FALSE;
+ if (routed) *routed = FALSE;
if ((rc = deliver_split_address(addr)) == OK)
{
- if (!is_recipient) sender_address = null_sender;
+ if (!(options & vopt_is_recipient)) sender_address = null_sender;
rc = route_address(addr, &addr_local, &addr_remote, &addr_new,
&addr_succeed, verify_type);
sender_address = save_sender; /* Put back the real sender */
if (rc == OK)
{
- if (routed != NULL) *routed = TRUE;
+ BOOL local_verify = FALSE;
+
+ if (routed) *routed = TRUE;
if (callout > 0)
{
- host_item *host_list = addr->host_list;
-
- /* Default, if no remote transport, to NULL for the interface (=> any),
- "smtp" for the port, and "smtp" for the protocol. */
-
- transport_feedback tf = { NULL, US"smtp", US"smtp", NULL, FALSE, FALSE };
+ transport_instance * tp;
+ host_item * host_list = addr->host_list;
+
+ /* Make up some data for use in the case where there is no remote
+ transport. */
+
+ transport_feedback tf = {
+ .interface = NULL, /* interface (=> any) */
+ .port = US"smtp",
+ .protocol = US"smtp",
+ .hosts = NULL,
+ .helo_data = US"$smtp_active_hostname",
+ .hosts_override = FALSE,
+ .hosts_randomize = FALSE,
+ .gethostbyname = FALSE,
+ .qualify_single = TRUE,
+ .search_parents = FALSE
+ };
/* If verification yielded a remote transport, we want to use that
transport's options, so as to mimic what would happen if we were really
sending a message to this address. */
- if (addr->transport != NULL && !addr->transport->info->local)
- {
- (void)(addr->transport->setup)(addr->transport, addr, &tf, 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))
- {
- uschar *s;
-
- 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;
-
- if (s == NULL)
- {
- 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);
- }
- else
- {
- uschar *canonical_name;
- host_item *host, *nexthost;
- host_build_hostlist(&host_list, s, tf.hosts_randomize);
-
- /* Just ignore failures to find a host address. If we don't manage
- to find any addresses, the callout will defer. Note that more than
- one address may be found for a single host, which will result in
- additional host items being inserted into the chain. Hence we must
- save the next host first. */
-
- for (host = host_list; host != NULL; host = nexthost)
- {
- nexthost = host->next;
- if (tf.gethostbyname || string_is_ip_address(host->name, NULL))
- (void)host_find_byname(host, NULL, &canonical_name, 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);
- }
- }
- }
- }
- }
-
- /* Can only do a callout if we have at least one host! If the callout
+ if ((tp = addr->transport))
+ if (!tp->info->local)
+ {
+ (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 && (!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 = save_deliver_domain;
+ deliver_localpart = save_deliver_localpart;
+
+ if (!s)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts "
+ "\"%s\" in %s transport for callout: %s", tf.hosts,
+ tp->name, expand_string_message);
+ }
+ else
+ {
+ int flags;
+ host_build_hostlist(&host_list, s, tf.hosts_randomize);
+
+ /* Just ignore failures to find a host address. If we don't manage
+ to find any addresses, the callout will defer. Note that more than
+ one address may be found for a single host, which will result in
+ additional host items being inserted into the chain. Hence we must
+ save the next host first. */
+
+ flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
+ if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
+ if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
+
+ for (host_item * host = host_list, * nexthost; host; host = nexthost)
+ {
+ nexthost = host->next;
+ if (tf.gethostbyname ||
+ string_is_ip_address(host->name, NULL) != 0)
+ (void)host_find_byname(host, NULL, flags, NULL, TRUE);
+ else
+ {
+ const dnssec_domains * dsp = NULL;
+ if (Ustrcmp(tp->driver_name, "smtp") == 0)
+ {
+ smtp_transport_options_block * ob =
+ (smtp_transport_options_block *) tp->options_block;
+ dsp = &ob->dnssec;
+ }
+
+ (void) host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
+ dsp, NULL, NULL);
+ }
+ }
+ }
+ }
+ }
+ else if ( options & vopt_quota
+ && Ustrcmp(tp->driver_name, "appendfile") == 0)
+ local_verify = TRUE;
+
+ /* 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)
+ if (host_checking && !f.host_checking_callout)
{
HDEBUG(D_verify)
debug_printf("... callout omitted by default when host testing\n"
}
else
{
+#ifndef DISABLE_TLS
+ deliver_set_expansions(addr);
+#endif
rc = do_callout(addr, host_list, &tf, callout, callout_overall,
callout_connect, options, se_mailfrom, pm_mailfrom);
+#ifndef DISABLE_TLS
+ deliver_set_expansions(NULL);
+#endif
+ if ( options & vopt_is_recipient
+ && rc == OK
+ /* set to "random", with OK, for an accepted random */
+ && !recipient_verify_failure
+ )
+ callout_verified_rcpt(addr);
}
}
+ else if (local_verify)
+ {
+ HDEBUG(D_verify) debug_printf("Attempting quota verification\n");
+
+ deliver_set_expansions(addr);
+ deliver_local(addr, TRUE);
+ rc = addr->transport_return;
+ }
else
- {
HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor "
- "transport provided a host list\n");
- }
+ "transport provided a host list, or transport is not smtp\n");
}
}
-
+
/* Otherwise, any failure is a routing failure */
-
- else *failure_ptr = US"route";
+
+ else *failure_ptr = US"route";
/* A router may return REROUTED if it has set up a child address as a result
of a change of domain name (typically from widening). In this case we always
if (rc == FAIL)
{
allok = FALSE;
- if (f != NULL)
+ if (fp)
{
- fprintf(f, "%s%s %s", ko_prefix, address,
- address_test_mode? "is undeliverable" : "failed to verify");
- if (!expn && admin_user)
+ address_item *p = addr->parent;
+
+ respond_printf(fp, "%s%s %s", ko_prefix,
+ full_info ? addr->address : address,
+ f.address_test_mode ? "is undeliverable" : "failed to verify");
+ if (!expn && f.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(fp, ": %s", strerror(addr->basic_errno));
+ if (addr->message)
+ respond_printf(fp, ": %s", addr->message);
+ }
+
+ /* Show parents iff doing full info */
+
+ if (full_info) while (p)
+ {
+ respond_printf(fp, "%s\n <-- %s", cr, p->address);
+ p = p->parent;
}
- fprintf(f, "%s\n", cr);
+ respond_printf(fp, "%s\n", cr);
}
+ cancel_cutthrough_connection(TRUE, US"routing hard fail");
- if (!full_info) return copy_error(vaddr, addr, FAIL);
- else yield = FAIL;
+ if (!full_info)
+ {
+ yield = copy_error(vaddr, addr, FAIL);
+ goto out;
+ }
+ yield = FAIL;
}
/* Soft failure */
else if (rc == DEFER)
{
allok = FALSE;
- if (f != NULL)
+ if (fp)
{
- fprintf(f, "%s%s cannot be resolved at this time", ko_prefix, address);
- if (!expn && admin_user)
+ address_item *p = addr->parent;
+ respond_printf(fp, "%s%s cannot be resolved at this time", ko_prefix,
+ full_info? addr->address : address);
+ if (!expn && f.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(fp, ": %s", strerror(addr->basic_errno));
+ if (addr->message)
+ respond_printf(fp, ": %s", addr->message);
else if (addr->basic_errno <= 0)
- fprintf(f, ":\n unknown error");
+ respond_printf(fp, ": unknown error");
+ }
+
+ /* Show parents iff doing full info */
+
+ if (full_info) while (p)
+ {
+ respond_printf(fp, "%s\n <-- %s", cr, p->address);
+ p = p->parent;
}
+ respond_printf(fp, "%s\n", cr);
+ }
+ cancel_cutthrough_connection(TRUE, US"routing soft fail");
- fprintf(f, "%s\n", cr);
+ if (!full_info)
+ {
+ yield = copy_error(vaddr, addr, DEFER);
+ goto out;
}
- if (!full_info) return copy_error(vaddr, addr, DEFER);
- else if (yield == OK) yield = DEFER;
+ if (yield == OK) yield = DEFER;
}
/* If we are handling EXPN, we do not want to continue to route beyond
- the top level. */
+ the top level (whose address is in "address"). */
else if (expn)
{
uschar *ok_prefix = US"250-";
- if (addr_new == NULL)
- {
- if (addr_local == NULL && addr_remote == NULL)
- fprintf(f, "250 mail to <%s> is discarded\r\n", address);
+
+ if (!addr_new)
+ if (!addr_local && !addr_remote)
+ respond_printf(fp, "250 mail to <%s> is discarded\r\n", address);
else
- fprintf(f, "250 <%s>\r\n", address);
- }
- else while (addr_new != NULL)
+ respond_printf(fp, "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(fp, "%s<%s>\r\n", ok_prefix, addr2->address);
+ } while (addr_new);
+ yield = OK;
+ goto out;
}
/* Successful routing other than EXPN. */
just a single new address as a special case, and continues on to verify the
generated address. */
- if (!full_info && /* Stop if short info wanted AND */
- (addr_new == NULL || /* No new address OR */
- addr_new->next != NULL || /* More than one new address OR */
- testflag(addr_new, af_pfr))) /* New address is pfr */
+ if ( !full_info /* Stop if short info wanted AND */
+ && ( ( !addr_new /* No new address OR */
+ || addr_new->next /* More than one new address OR */
+ || testflag(addr_new, af_pfr) /* New address is pfr */
+ )
+ || /* OR */
+ ( addr_new /* At least one new address AND */
+ && success_on_redirect /* success_on_redirect is set */
+ ) )
+ )
{
- if (f != NULL) fprintf(f, "%s %s\n", address,
- address_test_mode? "is deliverable" : "verified");
+ if (fp) fprintf(fp, "%s %s\n",
+ address, f.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;
+ vaddr->prop.variables = NULL;
+ tree_dup((tree_node **)&vaddr->prop.variables, addr->prop.variables);
+
+ /* If stopped because more than one new address, cannot cutthrough */
+
+ if (addr_new && addr_new->next)
+ cancel_cutthrough_connection(TRUE, US"multiple addresses from routing");
+
+ yield = OK;
+ goto out;
}
}
} /* Loop for generated addresses */
/* Display the full results of the successful routing, including any generated
-addresses. Control gets here only when full_info is set, which requires f not
+addresses. Control gets here only when full_info is set, which requires fp not
to be NULL, and this occurs only when a top-level verify is called with the
debugging switch on.
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)
- fprintf(f, "mail to %s is discarded\n", address);
-
-else for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
+if (allok && !addr_local && !addr_remote)
{
- while (addr_list != NULL)
+ fprintf(fp, "mail to %s is discarded\n", address);
+ goto out;
+ }
+
+for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
+ while (addr_list)
{
address_item *addr = addr_list;
- address_item *p = addr->parent;
+ transport_instance * tp = addr->transport;
+
addr_list = addr->next;
- fprintf(f, "%s", CS addr->address);
- while (p != NULL)
+ fprintf(fp, "%s", CS addr->address);
+
+ /* 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(fp, " [duplicate, would not be delivered]");
+ else tree_add_duplicate(addr->unique, addr);
}
- fprintf(f, "\n ");
+
+ /* Now show its parents */
+
+ for (address_item * p = addr->parent; p; p = p->parent)
+ fprintf(fp, "\n <-- %s", p->address);
+ fprintf(fp, "\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(fp, "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 (host_item * 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);
- if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port);
- if (h->status == hstatus_unusable) fprintf(f, " ** unusable **");
- fprintf(f, "\n");
+ for (host_item * h = addr->host_list; h; h = h->next)
+ {
+ fprintf(fp, " host %-*s ", maxlen, h->name);
+
+ if (h->address)
+ fprintf(fp, "[%s%-*c", h->address, maxaddlen+1 - Ustrlen(h->address), ']');
+ else if (tp->info->local)
+ fprintf(fp, " %-*s ", maxaddlen, ""); /* Omit [unknown] for local */
+ else
+ fprintf(fp, "[%s%-*c", "unknown", maxaddlen+1 - 7, ']');
+
+ if (h->mx >= 0) fprintf(fp, " MX=%d", h->mx);
+ if (h->port != PORT_NONE) fprintf(fp, " port=%d", h->port);
+ if (f.running_in_test_harness && h->dnssec == DS_YES) fputs(" AD", fp);
+ if (h->status == hstatus_unusable) fputs(" ** unusable **", fp);
+ fputc('\n', fp);
}
}
}
- }
-/* Will be DEFER or FAIL if any one address has, only for full_info (which is
+/* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
the -bv or -bt case). */
-return yield;
+out:
+verify_mode = NULL;
+tls_modify_variables(&tls_in); /* return variables to inbound values */
+
+return yield;
}
*************************************************/
/* This function checks those header lines that contain addresses, and verifies
-that all the addresses therein are syntactially correct.
+that all the addresses therein are 5322-syntactially correct.
Arguments:
msgptr where to put an error message
int
verify_check_headers(uschar **msgptr)
{
-header_line *h;
uschar *colon, *s;
+int yield = OK;
-for (h = header_list; h != NULL; h = h->next)
+for (header_line * h = header_list; h && yield == OK; h = h->next)
{
if (h->type != htype_from &&
h->type != htype_reply_to &&
colon = Ustrchr(h->text, ':');
s = colon + 1;
- while (isspace(*s)) s++;
+ Uskip_whitespace(&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 */
+ f.parse_allow_group = TRUE;
- while (*s != 0)
+ while (*s)
{
uschar *ss = parse_find_address_end(s, FALSE);
uschar *recipient, *errmess;
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);
*ss = terminator;
- /* Permit an unqualified address only if the message is local, or if the
- sending host is configured to be permitted to send them. */
+ /* Permit an unqualified address only if the message is local, or if the
+ sending host is configured to be permitted to send them. */
+
+ if (recipient && !domain)
+ {
+ if (h->type == htype_from || h->type == htype_sender)
+ {
+ if (!f.allow_unqualified_sender) recipient = NULL;
+ }
+ else
+ {
+ if (!f.allow_unqualified_recipient) recipient = NULL;
+ }
+ if (!recipient) errmess = US"unqualified address not permitted";
+ }
+
+ /* It's an error if no address could be extracted, except for the special
+ case of an empty address. */
+
+ if (!recipient && Ustrcmp(errmess, "empty address") != 0)
+ {
+ 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 or the header name. */
+
+ while (t > s && isspace(t[-1])) t--;
+ while (tt > h->text && isspace(tt[-1])) tt--;
+
+ /* 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
+ quote in a humungous To: header creates an "address" that is longer
+ than string_sprintf can handle. */
+
+ len = t - s;
+ if (len > 1024)
+ {
+ len = 1024;
+ verb = US"begins";
+ }
+
+ /* deconst cast ok as we're passing a non-const to string_printing() */
+ *msgptr = US string_printing(
+ string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
+ errmess, (int)(tt - h->text), h->text, verb, len, s));
+
+ yield = FAIL;
+ break; /* Out of address loop */
+ }
+
+ /* Advance to the next address */
+
+ s = ss + (terminator ? 1 : 0);
+ Uskip_whitespace(&s);
+ } /* Next address */
+
+ f.parse_allow_group = FALSE;
+ f.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)
+{
+uschar *colon;
+
+for (header_line * h = header_list; h; h = h->next)
+ {
+ colon = Ustrchr(h->text, ':');
+ for(uschar * s = h->text; s < colon; s++)
+ if ((*s < 33) || (*s > 126))
+ {
+ *msgptr = string_sprintf("Invalid character in header \"%.*s\" found",
+ (int)(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: case_sensitive true if case sensitive matching should be used
+Returns: OK if there are no blind recipients
+ FAIL if there is at least one blind recipient
+*/
+
+int
+verify_check_notblind(BOOL case_sensitive)
+{
+for (int i = 0; i < recipients_count; i++)
+ {
+ BOOL found = FALSE;
+ uschar *address = recipients_list[i].address;
+
+ for (header_line * h = header_list; !found && h; h = h->next)
+ {
+ uschar *colon, *s;
+
+ if (h->type != htype_to && h->type != htype_cc) continue;
- if (recipient != NULL && domain == 0)
- {
- if (h->type == htype_from || h->type == htype_sender)
- {
- if (!allow_unqualified_sender) recipient = NULL;
- }
- else
- {
- if (!allow_unqualified_recipient) recipient = NULL;
- }
- if (recipient == NULL) errmess = US"unqualified address not permitted";
- }
+ colon = Ustrchr(h->text, ':');
+ s = colon + 1;
+ Uskip_whitespace(&s);
- /* It's an error if no address could be extracted, except for the special
- case of an empty address. */
+ /* Loop for multiple addresses in the header, enabling group syntax. Note
+ that we have to reset this after the header has been scanned. */
- if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
+ f.parse_allow_group = TRUE;
+
+ while (*s)
{
- uschar *verb = US"is";
- uschar *t = ss;
- int len;
+ uschar * ss = parse_find_address_end(s, FALSE);
+ uschar * recipient, * errmess;
+ int terminator = *ss;
+ int start, end, domain;
- /* Arrange not to include any white space at the end in the
- error message. */
+ /* Temporarily terminate the string at this point, and extract the
+ operative address within, allowing group syntax. */
- while (t > s && isspace(t[-1])) t--;
+ *ss = 0;
+ recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
+ *ss = terminator;
- /* Add the address which 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
- quote in a humungous To: header creates an "address" that is longer
- than string_sprintf can handle. */
+ /* If we found a valid recipient that has a domain, compare it with the
+ envelope recipient. Local parts are compared with case-sensitivity
+ according to the routine arg, 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. */
- len = t - s;
- if (len > 1024)
- {
- len = 1024;
- verb = US"begins";
- }
+ if (recipient && domain != 0)
+ if ((found = (case_sensitive
+ ? Ustrncmp(recipient, address, domain) == 0
+ : strncmpic(recipient, address, domain) == 0)
+ && strcmpic(recipient + domain, address + domain) == 0))
+ break;
- *msgptr = string_printing(
- string_sprintf("%s: failing address in \"%.*s\" header %s: %.*s",
- errmess, colon - h->text, h->text, verb, len, s));
+ /* Advance to the next address */
- return FAIL;
- }
+ s = ss + (terminator ? 1:0);
+ Uskip_whitespace(&s);
+ } /* Next address */
- /* Advance to the next address */
+ f.parse_allow_group = FALSE;
+ f.parse_found_group = FALSE;
+ } /* Next header (if found is false) */
- s = ss + (terminator? 1:0);
- while (isspace(*s)) s++;
- } /* Next address */
- } /* Next header */
+ if (!found) return FAIL;
+ } /* Next recipient */
return OK;
}
-
/*************************************************
* Find if verified sender *
*************************************************/
address_item *
verify_checked_sender(uschar *sender)
{
-address_item *addr;
-for (addr = sender_verified_list; addr != NULL; addr = addr->next)
- if (Ustrcmp(sender, addr->address) == 0) break;
-return addr;
+for (address_item * addr = sender_verified_list; addr; addr = addr->next)
+ if (Ustrcmp(sender, addr->address) == 0) return addr;
+return NULL;
}
log_msgptr points to where to put a log error message
callout timeout for callout check (passed to verify_address())
callout_overall overall callout timeout (ditto)
- callout_connect connect callout timeout (ditto)
+ callout_connect connect callout timeout (ditto)
se_mailfrom mailfrom for verify; NULL => ""
pm_mailfrom sender for pm callout check (passed to verify_address())
options callout options (passed to verify_address())
+ verrno where to put the address basic_errno
If log_msgptr is set to something without setting user_msgptr, the caller
normally uses log_msgptr for both things.
int
verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr,
- int callout, int callout_overall, int callout_connect, uschar *se_mailfrom,
- uschar *pm_mailfrom, int options)
+ int callout, int callout_overall, int callout_connect, uschar *se_mailfrom,
+ uschar *pm_mailfrom, int options, int *verrno)
{
static int header_types[] = { htype_sender, htype_reply_to, htype_from };
+BOOL done = FALSE;
int yield = FAIL;
-int i;
-for (i = 0; i < 3; i++)
- {
- header_line *h;
- for (h = header_list; h != NULL; h = h->next)
+for (int i = 0; i < 3 && !done; i++)
+ for (header_line * 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. */
+
+ f.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 && 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)
+ if (!address)
{
new_ok = FAIL;
- if (*log_msgptr != NULL)
- {
- while (ss > s && isspace(ss[-1])) ss--;
- *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
- "scanning for sender: %s in \"%.*s\"",
- endname - h->text, h->text, *log_msgptr, ss - s, s);
- return FAIL;
- }
+ while (ss > s && isspace(ss[-1])) ss--;
+ *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
+ "scanning for sender: %s in \"%.*s\"",
+ (int)(endname - h->text), h->text, *log_msgptr, (int)(ss - s), s);
+ yield = FAIL;
+ done = TRUE;
+ break;
}
- /* Else go ahead with the sender verification. But is isn't *the*
+ /* Else go ahead with the sender verification. But it isn't *the*
sender of the message, so set vopt_fake_sender to stop sender_address
being replaced after rewriting or qualification. */
{
vaddr = deliver_make_addr(address, FALSE);
new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender,
- callout, callout_overall, callout_connect, se_mailfrom,
+ callout, callout_overall, callout_connect, se_mailfrom,
pm_mailfrom, NULL);
}
}
last of these will be returned to the user if all three fail. We do not
set a log message - the generic one below will be used. */
- if (new_ok != OK && smtp_return_error_details)
+ if (new_ok != OK)
{
- *user_msgptr = string_sprintf("Rejected after DATA: "
- "could not verify \"%.*s\" header address\n%s: %s",
- endname - h->text, h->text, vaddr->address, vaddr->message);
+ *verrno = vaddr->basic_errno;
+ if (smtp_return_error_details)
+ *user_msgptr = string_sprintf("Rejected after DATA: "
+ "could not verify \"%.*s\" header address\n%s: %s",
+ (int)(endname - h->text), h->text, vaddr->address, vaddr->message);
}
/* Success or defer */
- if (new_ok == OK) return OK;
+ if (new_ok == OK)
+ {
+ yield = OK;
+ done = TRUE;
+ break;
+ }
+
if (new_ok == DEFER) yield = DEFER;
/* Move on to any more addresses in the header */
s = ss;
- }
- }
- }
+ } /* Next address */
+
+ f.parse_allow_group = FALSE;
+ f.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";
void
verify_get_ident(int port)
{
-int sock, host_af, qlen;
+client_conn_ctx ident_conn_ctx = {0};
+int host_af, qlen;
int received_sender_port, received_interface_port, n;
uschar *p;
+blob early_data;
uschar buffer[2048];
/* Default is no ident. Check whether we want to do an ident check for this
to the incoming interface address. If the sender host address is an IPv6
address, the incoming interface address will also be IPv6. */
-host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6;
-sock = ip_socket(SOCK_STREAM, host_af);
-if (sock < 0) return;
+host_af = Ustrchr(sender_host_address, ':') == NULL ? AF_INET : AF_INET6;
+if ((ident_conn_ctx.sock = ip_socket(SOCK_STREAM, host_af)) < 0) return;
-if (ip_bind(sock, host_af, interface_address, 0) < 0)
+if (ip_bind(ident_conn_ctx.sock, host_af, interface_address, 0) < 0)
{
DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n",
strerror(errno));
goto END_OFF;
}
-if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout)
- < 0)
+/* Construct and send the query. */
+
+qlen = snprintf(CS buffer, sizeof(buffer), "%d , %d\r\n",
+ sender_host_port, interface_port);
+early_data.data = buffer;
+early_data.len = qlen;
+
+/*XXX we trust that the query is idempotent */
+if (ip_connect(ident_conn_ctx.sock, host_af, sender_host_address, port,
+ rfc1413_query_timeout, &early_data) < 0)
{
- if (errno == ETIMEDOUT && (log_extra_selector & LX_ident_timeout) != 0)
- {
+ if (errno == ETIMEDOUT && LOGGING(ident_timeout))
log_write(0, LOG_MAIN, "ident connection to %s timed out",
sender_host_address);
- }
else
- {
DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n",
sender_host_address, strerror(errno));
- }
- goto END_OFF;
- }
-
-/* Construct and send the query. */
-
-sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port);
-qlen = Ustrlen(buffer);
-if (send(sock, buffer, qlen, 0) < 0)
- {
- DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno));
goto END_OFF;
}
int size = sizeof(buffer) - (p - buffer);
if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */
- count = ip_recv(sock, p, size, rfc1413_query_timeout);
+ count = ip_recv(&ident_conn_ctx, p, size, time(NULL) + rfc1413_query_timeout);
if (count <= 0) goto END_OFF; /* Read error or EOF */
/* Scan what we just read, to see if we have reached the terminating \r\n. Be
/* The rest of the line is the data we want. We turn it into printing
characters when we save it, so that it cannot mess up the format of any logging
or Received: lines into which it gets inserted. We keep a maximum of 127
-characters. */
+characters. The deconst cast is ok as we fed a nonconst to string_printing() */
-sender_ident = string_printing(string_copyn(p, 127));
+sender_ident = US string_printing(string_copyn(p, 127));
DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident);
END_OFF:
-close(sock);
+(void)close(ident_conn_ctx.sock);
return;
}
error for error message when returning ERROR
The block contains:
- host_name the host name or NULL, implying use sender_host_name and
- sender_host_aliases, looking them up if required
+ host_name (a) the host name, or
+ (b) NULL, implying use sender_host_name and
+ sender_host_aliases, looking them up if required, or
+ (c) the empty string, meaning that only IP address matches
+ are permitted
host_address the host address
host_ipv4 the IPv4 address taken from an IPv6 one
Returns: OK matched
FAIL did not match
DEFER lookup deferred
- ERROR failed to find the host name or IP address
- unknown lookup type specified
+ ERROR (a) failed to find the host name or IP address, or
+ (b) unknown lookup type specified, or
+ (c) host name encountered when only IP addresses are
+ being matched
*/
-static int
-check_host(void *arg, uschar *ss, uschar **valueptr, uschar **error)
+int
+check_host(void * arg, const uschar * ss, const uschar ** valueptr, uschar ** error)
{
-check_host_block *cb = (check_host_block *)arg;
+check_host_block * cb = (check_host_block *)arg;
+int mlen = -1;
int maskoffset;
-BOOL isquery = FALSE;
-uschar *semicolon, *t;
-uschar **aliases;
+BOOL iplookup = FALSE, isquery = FALSE;
+BOOL isiponly = cb->host_name && !cb->host_name[0];
+const uschar * t;
+uschar * semicolon, * endname, * opts;
+uschar ** aliases;
/* Optimize for the special case when the pattern is "*". */
-if (*ss == '*' && ss[1] == 0) return OK;
+if (*ss == '*' && !ss[1]) return OK;
/* If the pattern is empty, it matches only in the case when there is no host -
this can occur in ACL checking for SMTP input using the -bs option. In this
situation, the host address is the empty string. */
-if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL;
-if (*ss == 0) return FAIL;
+if (!cb->host_address[0]) return *ss ? FAIL : OK;
+if (!*ss) return FAIL;
-/* If the pattern is precisely "@" then match against the primary host name;
-if it's "@[]" match against the local host's IP addresses. */
+/* If the pattern is precisely "@" then match against the primary host name,
+provided that host name matching is permitted; if it's "@[]" match against the
+local host's IP addresses. */
if (*ss == '@')
- {
- if (ss[1] == 0) ss = primary_hostname;
+ if (ss[1] == 0)
+ {
+ if (isiponly) return ERROR;
+ ss = primary_hostname;
+ }
else if (Ustrcmp(ss, "@[]") == 0)
{
- ip_address_item *ip;
- for (ip = host_find_interfaces(); ip != NULL; ip = ip->next)
+ for (ip_address_item * ip = host_find_interfaces(); ip; ip = ip->next)
if (Ustrcmp(ip->address, cb->host_address) == 0) return OK;
return FAIL;
}
- }
/* If the pattern is an IP address, optionally followed by a bitmask count, do
-a (possibly masked) comparision with the current IP address. */
+a (possibly masked) comparison with the current IP address. */
-if (string_is_ip_address(ss, &maskoffset))
+if (string_is_ip_address(ss, &maskoffset) != 0)
return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
-/* If the item is of the form net[n]-lookup;<file|query> then it is a lookup on
-a masked IP network, in textual form. The net- stuff really only applies to
-single-key lookups where the key is implicit. For query-style lookups the key
-is specified in the query. From release 4.30, the use of net- for query style
-is no longer needed, but we retain it for backward compatibility. */
-
-if (Ustrncmp(ss, "net", 3) == 0 && (semicolon = Ustrchr(ss, ';')) != NULL)
+/* The pattern is not an IP address. A common error that people make is to omit
+one component of an IPv4 address, either by accident, or believing that, for
+example, 1.2.3/24 is the same as 1.2.3.0/24, or 1.2.3 is the same as 1.2.3.0,
+which it isn't. (Those applications that do accept 1.2.3 as an IP address
+interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an
+ancient specification.) To aid in debugging these cases, we give a specific
+error if the pattern contains only digits and dots or contains a slash preceded
+only by digits and dots (a slash at the start indicates a file name and of
+course slashes may be present in lookups, but not preceded only by digits and
+dots). */
+
+for (t = ss; isdigit(*t) || *t == '.'; ) t++;
+if (!*t || (*t == '/' && t != ss))
{
- int mlen = 0;
- for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
- if (*t++ == '-')
- {
- int insize;
- int search_type;
- int incoming[4];
- void *handle;
- uschar *filename, *key, *result;
- uschar buffer[64];
+ *error = US"malformed IPv4 address or address mask";
+ return ERROR;
+ }
- /* If no mask was supplied, set a negative value */
+/* See if there is a semicolon in the pattern, separating a searchtype
+prefix. If there is one then check for comma-sep options. */
- if (mlen == 0 && t == ss+4) mlen = -1;
+if ((semicolon = Ustrchr(ss, ';')))
+ if ((opts = Ustrchr(ss, ',')) && opts < semicolon)
+ {
+ endname = opts++;
+ opts = string_copyn(opts, semicolon - opts);
+ }
+ else
+ {
+ endname = semicolon;
+ opts = NULL;
+ }
- /* Find the search type */
+/* If we are doing an IP address only match, then all lookups must be IP
+address lookups, even if there is no "net-". */
- search_type = search_findtype(t, semicolon - t);
+if (isiponly)
+ iplookup = semicolon != NULL;
- if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
- search_error_message);
+/* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
+a lookup on a masked IP network, in textual form. We obey this code even if we
+have already set iplookup, so as to skip over the "net-" prefix and to set the
+mask length. The net- stuff really only applies to single-key lookups where the
+key is implicit. For query-style lookups the key is specified in the query.
+From release 4.30, the use of net- for query style is no longer needed, but we
+retain it for backward compatibility. */
- /* Adjust parameters for the type of lookup. For a query-style
- lookup, there is no file name, and the "key" is just the query. For
- a single-key lookup, the key is the current IP address, masked
- appropriately, and reconverted to text form, with the mask appended. */
+if (Ustrncmp(ss, "net", 3) == 0 && semicolon)
+ {
+ mlen = 0;
+ for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
+ if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */
+ iplookup = *t++ == '-';
+ }
+else
+ t = ss;
- if (mac_islookup(search_type, lookup_querystyle))
- {
- filename = NULL;
- key = semicolon + 1;
- }
- else
- {
- insize = host_aton(cb->host_address, incoming);
- host_mask(insize, incoming, mlen);
- (void)host_nmtoa(insize, incoming, mlen, buffer);
- key = buffer;
- filename = semicolon + 1;
- }
+/* Do the IP address lookup if that is indeed what we have */
- /* Now do the actual lookup; note that there is no search_close() because
- of the caching arrangements. */
+if (iplookup)
+ {
+ int insize;
+ int search_type;
+ int incoming[4];
+ void *handle;
+ uschar *filename, *key, *result;
+ uschar buffer[64];
+
+ /* Find the search type */
+
+ search_type = search_findtype(t, endname - t);
+
+ if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
+ search_error_message);
+
+ /* Adjust parameters for the type of lookup. For a query-style lookup, there
+ is no file name, and the "key" is just the query. For query-style with a file
+ name, we have to fish the file off the start of the query. For a single-key
+ lookup, the key is the current IP address, masked appropriately, and
+ reconverted to text form, with the mask appended. For IPv6 addresses, specify
+ dot separators instead of colons, except when the lookup type is "iplsearch".
+ */
- handle = search_open(filename, search_type, 0, NULL, NULL);
- if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
- search_error_message);
- result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
- if (valueptr != NULL) *valueptr = result;
- return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
+ if (mac_islookup(search_type, lookup_absfilequery))
+ {
+ filename = semicolon + 1;
+ key = filename;
+ while (*key != 0 && !isspace(*key)) key++;
+ filename = string_copyn(filename, key - filename);
+ while (isspace(*key)) key++;
+ }
+ else if (mac_islookup(search_type, lookup_querystyle))
+ {
+ filename = NULL;
+ key = semicolon + 1;
+ }
+ else /* Single-key style */
+ {
+ int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)?
+ ':' : '.';
+ insize = host_aton(cb->host_address, incoming);
+ host_mask(insize, incoming, mlen);
+ (void)host_nmtoa(insize, incoming, mlen, buffer, sep);
+ key = buffer;
+ filename = semicolon + 1;
}
+
+ /* Now do the actual lookup; note that there is no search_close() because
+ of the caching arrangements. */
+
+ if (!(handle = search_open(filename, search_type, 0, NULL, NULL)))
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", search_error_message);
+
+ result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL, opts);
+ if (valueptr) *valueptr = result;
+ return result ? OK : f.search_find_defer ? DEFER: FAIL;
}
/* The pattern is not an IP address or network reference of any kind. That is,
-it is a host name pattern. Check the characters of the pattern to see if they
-comprise only letters, digits, full stops, and hyphens (the constituents of
-domain names). Allow underscores, as they are all too commonly found. Sigh.
-Also, if allow_utf8_domains is set, allow top-bit characters. */
+it is a host name pattern. If this is an IP only match, there's an error in the
+host list. */
+
+if (isiponly)
+ {
+ *error = US"cannot match host name in match_ip list";
+ return ERROR;
+ }
-for (t = ss; *t != 0; t++)
+/* Check the characters of the pattern to see if they comprise only letters,
+digits, full stops, and hyphens (the constituents of domain names). Allow
+underscores, as they are all too commonly found. Sigh. Also, if
+allow_utf8_domains is set, allow top-bit characters. */
+
+for (t = ss; *t; t++)
if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' &&
(!allow_utf8_domains || *t < 128)) break;
its IP address and match against that. Note that a multi-homed host will add
items to the chain. */
-if (*t == 0)
+if (!*t)
{
int rc;
host_item h;
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;
- }
+ for (host_item * hh = &h; hh; hh = hh->next)
+ if (host_is_in_net(hh->address, cb->host_address, 0)) return OK;
return FAIL;
}
if (rc == HOST_FIND_AGAIN) return DEFER;
outgoing hosts, the name is always given explicitly. If it is NULL, it means we
must use sender_host_name and its aliases, looking them up if necessary. */
-if (cb->host_name != NULL) /* Explicit host name given */
- return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE,
- valueptr);
+if (cb->host_name) /* Explicit host name given */
+ return match_check_string(cb->host_name, ss, -1,
+ MCS_PARTIAL | MCS_CASELESS | MCS_AT_SPECIAL | cb->flags, valueptr);
/* Host name not given; in principle we need the sender host name and its
aliases. However, for query-style lookups, we do not need the name if the
$sender_host_name causes it to be looked up, so we don't need to do the lookup
on spec. */
-if ((semicolon = Ustrchr(ss, ';')) != NULL)
+if ((semicolon = Ustrchr(ss, ';')))
{
- uschar *affix;
+ const uschar * affix, * opts;
int partial, affixlen, starflags, id;
*semicolon = 0;
- id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags);
+ id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags,
+ &opts);
*semicolon=';';
if (id < 0) /* Unknown lookup type */
search_error_message, ss);
return DEFER;
}
- isquery = mac_islookup(id, lookup_querystyle);
+ isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery);
}
if (isquery)
{
- switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr))
+ switch(match_check_string(US"", ss, -1,
+ MCS_PARTIAL| MCS_CASELESS| MCS_AT_SPECIAL | (cb->flags & MCS_CACHEABLE),
+ valueptr))
{
case OK: return OK;
case DEFER: return DEFER;
/* Not a query-style lookup; must ensure the host name is present, and then we
do a check on the name and all its aliases. */
-if (sender_host_name == NULL)
+if (!sender_host_name)
{
HDEBUG(D_host_lookup)
debug_printf("sender host name required, to match against %s\n", ss);
/* Match on the sender host name, using the general matching function */
-switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE,
- valueptr))
+switch(match_check_string(sender_host_name, ss, -1,
+ MCS_PARTIAL| MCS_CASELESS| MCS_AT_SPECIAL | (cb->flags & MCS_CACHEABLE),
+ valueptr))
{
case OK: return OK;
case DEFER: return DEFER;
/* If there are aliases, try matching on them. */
aliases = sender_host_aliases;
-while (*aliases != NULL)
- {
- switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr))
+while (*aliases)
+ switch(match_check_string(*aliases++, ss, -1,
+ MCS_PARTIAL| MCS_CASELESS| MCS_AT_SPECIAL | (cb->flags & MCS_CACHEABLE),
+ valueptr))
{
case OK: return OK;
case DEFER: return DEFER;
}
- }
return FAIL;
}
"+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;
-check_host_block cb;
-cb.host_name = host_name;
-cb.host_address = host_address;
+const uschar *save_host_address = deliver_host_address;
+check_host_block cb = { .host_name = host_name, .host_address = host_address };
-if (valueptr != NULL) *valueptr = NULL;
+if (valueptr) *valueptr = NULL;
/* If the host address starts off ::ffff: it is an IPv6 address in
IPv4-compatible mode. Find the IPv4 part for checking against IPv4
addresses. */
-cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)?
- host_address + 7 : host_address;
+cb.host_ipv4 = Ustrncmp(host_address, "::ffff:", 7) == 0
+ ? host_address + 7 : host_address;
-/* During the running of the check, put the IP address into $host_address. In
-the case of calls from the smtp transport, it will already be there. However,
-in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
+/* During the running of the check, put the IP address into $host_address. In
+the case of calls from the smtp transport, it will already be there. However,
+in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
the safe side, any existing setting is preserved, though as I write this
(November 2004) I can't see any cases where it is actually needed. */
check_host, /* function for testing */
&cb, /* argument for function */
MCL_HOST, /* type of check */
- (host_address == sender_host_address)?
- US"host" : host_address, /* text for debugging */
+ host_address == sender_host_address
+ ? US"host" : host_address, /* text for debugging */
valueptr); /* where to pass back data */
deliver_host_address = save_host_address;
-return rc;
+return rc;
}
+/*************************************************
+* Check the given host item matches a list *
+*************************************************/
+int
+verify_check_given_host(const uschar **listptr, const host_item *host)
+{
+return verify_check_this_host(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,
- (sender_host_address == NULL)? US"" : sender_host_address, NULL);
+return verify_check_this_host(CUSS listptr, sender_host_cache, NULL,
+ sender_host_address ? sender_host_address : US"", 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];
if (host_aton(address, bin) == 1)
{
- int i;
int x = bin[0];
- for (i = 0; i < 4; i++)
+ for (int i = 0; i < 4; i++)
{
sprintf(CS bptr, "%d.", x & 255);
while (*bptr) bptr++;
#if HAVE_IPV6
else
- {
- int i, j;
- for (j = 3; j >= 0; j--)
+ for (int j = 3; j >= 0; j--)
{
int x = bin[j];
- for (i = 0; i < 8; i++)
+ for (int i = 0; i < 8; i++)
{
sprintf(CS bptr, "%x.", x & 15);
while (*bptr) bptr++;
x >>= 4;
}
}
- }
#endif
-}
-
-
-
-/*************************************************
-* Check host against DNS black lists *
-*************************************************/
-/* This function runs checks against a list of DNS black lists, until one
-matches. Each item on the list can be of the form
+/* 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" */
- domain=ip-address/key
+*(--bptr) = 0;
+}
-The domain is the right-most domain that is used for the query, for example,
-blackholes.mail-abuse.org. If the IP address is present, there is a match only
-if the DNS lookup returns a matching IP address. Several addresses may be
-given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2.
-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,
- dsn.rfc-ignorant.org/$sender_address_domain
+/****************************************************
+ Verify a local user account for quota sufficiency
+****************************************************/
-After finding a match in the DNS, the domain is placed in $dnslist_domain, and
-then we check for a TXT record for an error message, and if found, save its
-value in $dnslist_text. We also cache everything in a tree, to optimize
-multiple lookups.
+/* The real work, done via a re-exec for privs, calls
+down to the transport for the quota check.
-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
+Route and transport (in recipient-verify mode) the
+given recipient.
-Arguments:
- listptr the domain/address/data list
+A routing result indicating any transport type other than appendfile
+results in a fail.
-Returns: OK successful lookup (i.e. the address is on the list), or
- lookup deferred after +include_unknown
- FAIL name not found, or no data found for the given type, or
- lookup deferred after +exclude_unknown (default)
- DEFER lookup failure, if +defer_unknown was set
+Return, on stdout, a result string containing:
+- highlevel result code (OK, DEFER, FAIL)
+- errno
+- where string
+- message string
*/
-int
-verify_check_dnsbl(uschar **listptr)
+void
+verify_quota(uschar * address)
{
-int sep = 0;
-int defer_return = FAIL;
-int old_pool = store_pool;
-BOOL invert_result = FALSE;
-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 */
+address_item vaddr = {.address = address};
+BOOL routed;
+uschar * msg = US"\0";
+int rc, len = 1;
-/* Indicate that the inverted IP address is not yet set up */
-
-revadd[0] = 0;
-
-/* Loop through all the domains supplied, until something matches */
-
-while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
+if ((rc = verify_address(&vaddr, NULL, vopt_is_recipient | vopt_quota,
+ 1, 0, 0, NULL, NULL, &routed)) != OK)
{
- BOOL frc;
- BOOL bitmask = FALSE;
- dns_answer dnsa;
- dns_scan dnss;
- uschar *iplist;
- uschar *key;
- tree_node *t;
- dnsbl_cache_block *cb;
-
- HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain);
-
- /* Deal with special values that change the behaviour on defer */
-
- if (domain[0] == '+')
- {
- if (strcmpic(domain, US"+include_unknown") == 0) defer_return = OK;
- else if (strcmpic(domain, US"+exclude_unknown") == 0) defer_return = FAIL;
- else if (strcmpic(domain, US"+defer_unknown") == 0) defer_return = DEFER;
- else
- log_write(0, LOG_MAIN|LOG_PANIC, "unknown item in dnslist (ignored): %s",
- domain);
- continue;
- }
-
- /* See if there's explicit data to be looked up */
-
- key = Ustrchr(domain, '/');
- if (key != NULL) *key++ = 0;
-
- /* See if there's a list of addresses supplied after the domain name. This is
- introduced by an = or a & character; if preceded by ! we invert the result.
- */
-
- iplist = Ustrchr(domain, '=');
- if (iplist == NULL)
- {
- bitmask = TRUE;
- iplist = Ustrchr(domain, '&');
- }
-
- if (iplist != NULL)
- {
- if (iplist > domain && iplist[-1] == '!')
- {
- invert_result = TRUE;
- iplist[-1] = 0;
- }
- *iplist++ = 0;
- }
-
- /* Check that what we have left is a sensible domain name. There is no reason
- why these domains should in fact use the same syntax as hosts and email
- domains, but in practice they seem to. However, there is little point in
- actually causing an error here, because that would no doubt hold up incoming
- mail. Instead, I'll just log it. */
-
- for (s = domain; *s != 0; s++)
+ uschar * where = recipient_verify_failure;
+ msg = acl_verify_message ? acl_verify_message : vaddr.message;
+ if (!msg) msg = US"";
+ if (rc == DEFER && vaddr.basic_errno == ERRNO_EXIMQUOTA)
{
- if (!isalnum(*s) && *s != '-' && *s != '.')
- {
- log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
- "strange characters - is this right?", domain);
- break;
- }
+ rc = FAIL; /* DEFER -> FAIL */
+ where = US"quota";
+ vaddr.basic_errno = 0;
}
+ else if (!where) where = US"";
- /* Construct the query by adding the domain onto either the sending host
- address, or the given key string. */
-
- if (key == NULL)
- {
- if (sender_host_address == NULL) return FAIL; /* can never match */
- if (revadd[0] == 0) invert_address(revadd, sender_host_address);
- frc = string_format(query, sizeof(query), "%s%s", revadd, domain);
- }
- else
- {
- frc = string_format(query, sizeof(query), "%s.%s", key, domain);
- }
+ len = 5 + Ustrlen(msg) + 1 + Ustrlen(where);
+ msg = string_sprintf("%c%c%c%c%c%s%c%s", (uschar)rc,
+ (vaddr.basic_errno >> 24) & 0xff, (vaddr.basic_errno >> 16) & 0xff,
+ (vaddr.basic_errno >> 8) & 0xff, vaddr.basic_errno & 0xff,
+ where, '\0', msg);
+ }
- if (!frc)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
- "(ignored): %s...", query);
- continue;
- }
+DEBUG(D_verify) debug_printf_indent("verify_quota: len %d\n", len);
+write(1, msg, len);
+return;
+}
- /* Look for this query in the cache. */
- t = tree_search(dnsbl_cache, query);
+/******************************************************************************/
- /* If not cached from a previous lookup, we must do a DNS lookup, and
- cache the result in permanent memory. */
+/* Quota cache lookup. We use the callout hints db also for the quota cache.
+Return TRUE if a nonexpired record was found, having filled in the yield
+argument.
+*/
- if (t == NULL)
- {
- store_pool = POOL_PERM;
+static BOOL
+cached_quota_lookup(const uschar * rcpt, int * yield,
+ int pos_cache, int neg_cache)
+{
+open_db dbblock, *dbm_file = NULL;
+dbdata_callout_cache_address * cache_address_record;
- /* In case this is the first time the DNS resolver is being used. */
+if (!pos_cache && !neg_cache)
+ return FALSE;
+if (!(dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE, TRUE)))
+ {
+ HDEBUG(D_verify) debug_printf_indent("quota cache: not available\n");
+ return FALSE;
+ }
+if (!(cache_address_record = (dbdata_callout_cache_address *)
+ get_callout_cache_record(dbm_file, rcpt, US"address",
+ pos_cache, neg_cache)))
+ {
+ dbfn_close(dbm_file);
+ return FALSE;
+ }
+if (cache_address_record->result == ccache_accept)
+ *yield = OK;
+dbfn_close(dbm_file);
+return TRUE;
+}
- dns_init(FALSE, FALSE);
+/* Quota cache write */
- /* Set up a tree entry to cache the lookup */
+static void
+cache_quota_write(const uschar * rcpt, int yield, int pos_cache, int neg_cache)
+{
+open_db dbblock, *dbm_file = NULL;
+dbdata_callout_cache_address cache_address_record;
- 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);
+if (!pos_cache && !neg_cache)
+ return;
+if (!(dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE, TRUE)))
+ {
+ HDEBUG(D_verify) debug_printf_indent("quota cache: not available\n");
+ return;
+ }
- /* Do the DNS loopup . */
+cache_address_record.result = yield == OK ? ccache_accept : ccache_reject;
- HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query);
- cb->rc = dns_basic_lookup(&dnsa, query, T_A);
- cb->text_set = FALSE;
- cb->text = NULL;
- cb->rhs = NULL;
+(void)dbfn_write(dbm_file, rcpt, &cache_address_record,
+ (int)sizeof(dbdata_callout_cache_address));
+HDEBUG(D_verify) debug_printf_indent("wrote %s quota cache record for %s\n",
+ yield == OK ? "positive" : "negative", rcpt);
- /* If the lookup succeeded, cache the RHS address. The code allows for
- more than one address - this was for complete generality and the possible
- use of A6 records. However, A6 records have been reduced to experimental
- status (August 2001) and may die out. So they may never get used at all,
- let alone in dnsbl records. However, leave the code here, just in case.
+dbfn_close(dbm_file);
+return;
+}
- Quite apart from one A6 RR generating multiple addresses, there are DNS
- lists that return more than one A record, so we must handle multiple
- addresses generated in that way as well. */
- if (cb->rc == DNS_SUCCEED)
- {
- dns_record *rr;
- dns_address **addrp = &(cb->rhs);
- for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
- {
- if (rr->type == T_A)
- {
- dns_address *da = dns_address_from_rr(&dnsa, rr);
- if (da != NULL)
- {
- *addrp = da;
- while (da->next != NULL) da = da->next;
- addrp = &(da->next);
- }
- }
- }
+/* To evaluate a local user's quota, starting in ACL, we need to
+fork & exec to regain privileges, to that we can change to the user's
+identity for access to their files.
- /* If we didn't find any A records, change the return code. This can
- happen when there is a CNAME record but there are no A records for what
- it points to. */
+Arguments:
+ rcpt Recipient account
+ pos_cache Number of seconds to cache a positive result (delivery
+ to be accepted). Zero to disable caching.
+ neg_cache Number of seconds to cache a negative result. Zero to disable.
+ msg Pointer to result string pointer
- if (cb->rhs == NULL) cb->rc = DNS_NODATA;
- }
+Return: OK/DEFER/FAIL code
+*/
- store_pool = old_pool;
- }
+int
+verify_quota_call(const uschar * rcpt, int pos_cache, int neg_cache,
+ uschar ** msg)
+{
+int pfd[2], pid, save_errno, yield = FAIL;
+void (*oldsignal)(int);
+const uschar * where = US"socketpair";
- /* Previous lookup was cached */
+*msg = NULL;
- else
+if (cached_quota_lookup(rcpt, &yield, pos_cache, neg_cache))
+ {
+ HDEBUG(D_verify) debug_printf_indent("quota cache: address record is %s\n",
+ yield == OK ? "positive" : "negative");
+ if (yield != OK)
{
- HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
- cb = t->data.ptr;
+ recipient_verify_failure = US"quota";
+ acl_verify_message = *msg =
+ US"Previous (cached) quota verification failure";
}
+ return yield;
+ }
- /* We now have the result of the DNS lookup, either newly done, or cached
- from a previous call. If the lookup succeeded, check against the address
- list if there is one. This may be a positive equality list (introduced by
- "="), a negative equality list (introduced by "!="), a positive bitmask
- list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
-
- if (cb->rc == DNS_SUCCEED)
- {
- dns_address *da = NULL;
- uschar *addlist = cb->rhs->address;
-
- /* For A and AAAA records, there may be multiple addresses from multiple
- records. For A6 records (currently not expected to be used) there may be
- multiple addresses from a single record. */
-
- for (da = cb->rhs->next; da != NULL; da = da->next)
- addlist = string_sprintf("%s, %s", addlist, da->address);
-
- HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
- query, addlist);
-
- /* Address list check; this can be either for equality, or via a bitmask.
- In the latter case, all the bits must match. */
-
- if (iplist != NULL)
- {
- int ipsep = ',';
- uschar ip[46];
- uschar *ptr = iplist;
-
- while (string_nextinlist(&ptr, &ipsep, ip, sizeof(ip)) != NULL)
- {
- /* Handle exact matching */
- if (!bitmask)
- {
- for (da = cb->rhs; da != NULL; da = da->next)
- {
- if (Ustrcmp(CS da->address, ip) == 0) break;
- }
- }
- /* Handle bitmask matching */
- else
- {
- int address[4];
- int mask = 0;
-
- /* At present, all known DNS blocking lists use A records, with
- IPv4 addresses on the RHS encoding the information they return. I
- wonder if this will linger on as the last vestige of IPv4 when IPv6
- is ubiquitous? Anyway, for now we use paranoia code to completely
- ignore IPv6 addresses. The default mask is 0, which always matches.
- We change this only for IPv4 addresses in the list. */
-
- if (host_aton(ip, address) == 1) mask = address[0];
-
- /* Scan the returned addresses, skipping any that are IPv6 */
-
- for (da = cb->rhs; da != NULL; da = da->next)
- {
- if (host_aton(da->address, address) != 1) continue;
- if ((address[0] & mask) == mask) break;
- }
- }
-
- /* Break out if a match has been found */
-
- if (da != NULL) break;
- }
+if (pipe(pfd) != 0)
+ goto fail;
- /* If either
+where = US"fork";
+oldsignal = signal(SIGCHLD, SIG_DFL);
+if ((pid = exim_fork(US"quota-verify")) < 0)
+ {
+ save_errno = errno;
+ close(pfd[pipe_write]);
+ close(pfd[pipe_read]);
+ errno = save_errno;
+ goto fail;
+ }
- (a) No IP address in a positive list matched, or
- (b) An IP address in a negative list did match
+if (pid == 0) /* child */
+ {
+ close(pfd[pipe_read]);
+ force_fd(pfd[pipe_write], 1); /* stdout to pipe */
+ close(pfd[pipe_write]);
+ dup2(1, 0);
+ if (debug_fd > 0) force_fd(debug_fd, 2);
+
+ child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 3,
+ US"-MCq", string_sprintf("%d", message_size), rcpt);
+ /*NOTREACHED*/
+ }
- then behave as if the DNSBL lookup had not succeeded, i.e. the host is
- not on the list. */
+save_errno = errno;
+close(pfd[pipe_write]);
- if (invert_result != (da == NULL))
- {
- HDEBUG(D_dnsbl)
- {
- debug_printf("=> but we are not accepting this block class because\n");
- debug_printf("=> there was %s match for %c%s\n",
- invert_result? "an exclude":"no", bitmask? '&' : '=', iplist);
- }
- continue; /* With next DNSBL domain */
- }
- }
+if (pid < 0)
+ {
+ DEBUG(D_verify) debug_printf_indent(" fork: %s\n", strerror(save_errno));
+ }
+else
+ {
+ uschar buf[128];
+ int n = read(pfd[pipe_read], buf, sizeof(buf));
+ int status;
- /* Either there was no IP list, or the record matched. Look up a TXT record
- if it hasn't previously been done. */
+ waitpid(pid, &status, 0);
+ if (status == 0)
+ {
+ uschar * s;
- if (!cb->text_set)
+ if (n > 0) yield = buf[0];
+ if (n > 4)
+ save_errno = (buf[1] << 24) | (buf[2] << 16) | (buf[3] << 8) | buf[4];
+ if ((recipient_verify_failure = n > 5
+ ? string_copyn_taint(buf+5, n-5, GET_UNTAINTED) : NULL))
{
- cb->text_set = TRUE;
- if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED)
- {
- dns_record *rr;
- for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
- if (rr->type == T_TXT) break;
- if (rr != NULL)
- {
- int len = (rr->data)[0];
- if (len > 511) len = 127;
- store_pool = POOL_PERM;
- cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1));
- store_pool = old_pool;
- }
- }
+ int m;
+ s = buf + 5 + Ustrlen(recipient_verify_failure) + 1;
+ m = n - (s - buf);
+ acl_verify_message = *msg =
+ m > 0 ? string_copyn_taint(s, m, GET_UNTAINTED) : NULL;
}
- HDEBUG(D_dnsbl)
- {
- debug_printf("=> that means %s is listed at %s\n",
- (key == NULL)? sender_host_address : key, domain);
- }
+ DEBUG(D_verify) debug_printf_indent("verify call response:"
+ " len %d yield %s errno '%s' where '%s' msg '%s'\n",
+ n, rc_names[yield], strerror(save_errno), recipient_verify_failure, *msg);
- dnslist_domain = string_copy(domain);
- dnslist_value = addlist;
- dnslist_text = cb->text;
- return OK;
+ if ( yield == OK
+ || save_errno == 0 && Ustrcmp(recipient_verify_failure, "quota") == 0)
+ cache_quota_write(rcpt, yield, pos_cache, neg_cache);
+ else DEBUG(D_verify)
+ debug_printf_indent("result not cacheable\n");
}
-
- /* There was a problem with the DNS lookup */
-
- if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA)
+ else
{
- log_write(L_dnslist_defer, LOG_MAIN,
- "DNS list lookup defer (probably timeout) for %s: %s", query,
- (defer_return == OK)? US"assumed in list" :
- (defer_return == FAIL)? US"assumed not in list" :
- US"returned DEFER");
- return defer_return;
+ DEBUG(D_verify)
+ debug_printf_indent("verify call response: waitpid status 0x%04x\n", status);
}
+ }
- /* No entry was found in the DNS; continue for next domain */
-
- HDEBUG(D_dnsbl)
- {
- debug_printf("DNS lookup for %s failed\n", query);
- debug_printf("=> that means %s is not listed at %s\n",
- (key == NULL)? sender_host_address : key, domain);
- }
- } /* Continue with next domain */
+close(pfd[pipe_read]);
+signal(SIGCHLD, oldsignal);
+errno = save_errno;
+return yield;
-return FAIL;
+fail:
+DEBUG(D_verify) debug_printf_indent("verify_quota_call fail in %s\n", where);
+return yield;
}
+
+/* vi: aw ai sw=2
+*/
/* End of verify.c */
git://git.exim.org / exim.git / blobdiff