-/* $Cambridge: exim/src/src/verify.c,v 1.1 2004/10/07 10:39:01 ph10 Exp $ */
+/* $Cambridge: exim/src/src/verify.c,v 1.52 2008/09/29 11:41:07 nm4 Exp $ */
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* Copyright (c) University of Cambridge 1995 - 2007 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions concerned with verifying things. The original code for callout
static tree_node *dnsbl_cache = NULL;
+/* Bits for match_type in one_check_dnsbl() */
+
+#define MT_NOT 1
+#define MT_ALL 2
+
+
/*************************************************
* Retrieve a callout cache record *
portstring "port" option from transport, or NULL
protocolstring "protocol" option from transport, or NULL
callout the per-command callout timeout
- callout_overall the overall callout timeout (if < 0; use 4*callout)
+ callout_overall the overall callout timeout (if < 0 use 4*callout)
+ callout_connect the callout connection timeout (if < 0 use callout)
options the verification options - these bits are used:
vopt_is_recipient => this is a recipient address
vopt_callout_no_cache => don't use callout cache
+ vopt_callout_fullpm => if postmaster check, do full one
vopt_callout_random => do the "random" thing
vopt_callout_recipsender => use real sender for recipient
vopt_callout_recippmaster => use postmaster for recipient
static int
do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
- int callout, int callout_overall, int options, uschar *se_mailfrom,
- uschar *pm_mailfrom)
+ 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 *save_deliver_domain = deliver_domain;
+uschar **failure_ptr = is_recipient?
+ &recipient_verify_failure : &sender_verify_failure;
open_db dbblock;
open_db *dbm_file = NULL;
dbdata_callout_cache new_domain_record;
if (cache_record != NULL)
{
- /* If an early command (up to and including MAIL FROM:<>) was rejected,
- there is no point carrying on. The callout fails. */
-
- if (cache_record->result == ccache_reject)
+ /* In most cases, if an early command (up to and including MAIL FROM:<>)
+ was rejected, there is no point carrying on. The callout fails. However, if
+ we are doing a recipient verification with use_sender or use_postmaster
+ set, a previous failure of MAIL FROM:<> doesn't count, because this time we
+ will be using a non-empty sender. We have to remember this situation so as
+ not to disturb the cached domain value if this whole verification succeeds
+ (we don't want it turning into "accept"). */
+
+ old_domain_cache_result = cache_record->result;
+
+ if (cache_record->result == ccache_reject ||
+ (*from_address == 0 && cache_record->result == ccache_reject_mfnull))
{
setflag(addr, af_verify_nsfail);
HDEBUG(D_verify)
setflag(addr, af_verify_nsfail);
addr->user_message = US"(result of an earlier callout reused).";
yield = FAIL;
+ *failure_ptr = US"mail";
goto END_CALLOUT;
}
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;
HDEBUG(D_verify)
debug_printf("callout cache: address record is negative\n");
addr->user_message = US"Previous (cached) callout verification failure";
+ *failure_ptr = US"recipient";
yield = FAIL;
}
goto END_CALLOUT;
"callout_random_local_part: %s", expand_string_message);
}
-/* Default the overall callout timeout if not set, and record the time we are
-starting so that we can enforce it. */
+/* Default the connect and overall callout timeouts if not set, and record the
+time we are starting so that we can enforce it. */
if (callout_overall < 0) callout_overall = 4 * callout;
+if (callout_connect < 0) callout_connect = callout;
callout_start_time = time(NULL);
+/* Before doing a real callout, if this is an SMTP connection, flush the SMTP
+output because a callout might take some time. When PIPELINING is active and
+there are many recipients, the total time for doing lots of callouts can add up
+and cause the client to time out. So in this case we forgo the PIPELINING
+optimization. */
+
+if (smtp_out != NULL && !disable_callout_flush) mac_smtp_fflush();
+
/* Now make connections to the hosts and do real callouts. The list of hosts
is passed in as an argument. */
smtp_outblock outblock;
int host_af;
int port = 25;
+ BOOL send_quit = TRUE;
+ uschar *active_hostname = smtp_active_hostname;
uschar *helo = US"HELO";
uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
uschar inbuffer[4096];
host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
- /* 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. */
+ /* 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_domain = addr->domain;
+
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;
/* Set HELO string according to the protocol */
outblock.authenticating = FALSE;
/* Connect to the host; on failure, just loop for the next one, but we
- set the error for the last one. */
+ set the error for the last one. Use the callout_connect timeout. */
inblock.sock = outblock.sock =
- smtp_connect(host, host_af, port, interface, callout, TRUE);
+ 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));
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
continue;
}
- /* 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. */
+ /* Expand the helo_data string to find the host name to use. */
+
+ if (tf->helo_data != NULL)
+ {
+ uschar *s = expand_string(tf->helo_data);
+ if (s == NULL)
+ log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: failed to expand transport's "
+ "helo_data value for callout: %s", addr->address,
+ expand_string_message);
+ else active_hostname = s;
+ }
+
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
+
+ /* Wait for initial response, and send HELO. The smtp_write_command()
+ function leaves its command in big_buffer. This is used in error responses.
+ Initialize it in case the connection is rejected. */
Ustrcpy(big_buffer, "initial connection");
done =
smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
'2', callout) &&
-
smtp_write_command(&outblock, FALSE, "%s %s\r\n", helo,
- smtp_active_hostname) >= 0 &&
+ active_hostname) >= 0 &&
smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+ '2', callout);
+
+ /* Failure to accept HELO is cached; this blocks the whole domain for all
+ senders. I/O errors and defer responses are not cached. */
+
+ if (!done)
+ {
+ *failure_ptr = US"mail"; /* At or before MAIL */
+ if (errno == 0 && responsebuffer[0] == '5')
+ {
+ setflag(addr, af_verify_nsfail);
+ new_domain_record.result = ccache_reject;
+ }
+ }
+ /* Send the MAIL command */
+
+ else done =
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 the host does not accept MAIL FROM:<>, arrange to cache this
+ information, but again, don't record anything for an I/O error or a defer. Do
+ not cache rejections of MAIL when a non-empty sender has been used, because
+ that blocks the whole domain for all senders. */
if (!done)
{
+ *failure_ptr = US"mail"; /* At or before MAIL */
if (errno == 0 && responsebuffer[0] == '5')
{
setflag(addr, af_verify_nsfail);
- if (from_address[0] == 0) new_domain_record.result = ccache_reject;
+ if (from_address[0] == 0)
+ new_domain_record.result = ccache_reject_mfnull;
}
}
/* Otherwise, proceed to check a "random" address (if required), then the
given address, and the postmaster address (if required). Between each check,
issue RSET, because some servers accept only one recipient after MAIL
- FROM:<>. */
+ FROM:<>.
+
+ Before doing this, set the result in the domain cache record to "accept",
+ unless its previous value was ccache_reject_mfnull. In that case, the domain
+ rejects MAIL FROM:<> and we want to continue to remember that. When that is
+ the case, we have got here only in the case of a recipient verification with
+ a non-null sender. */
else
{
- new_domain_record.result = ccache_accept;
+ new_domain_record.result =
+ (old_domain_cache_result == ccache_reject_mfnull)?
+ ccache_reject_mfnull: ccache_accept;
/* Do the random local part check first */
smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
'2', callout) &&
- smtp_write_command(&outblock, FALSE, "MAIL FROM:<>\r\n") >= 0 &&
+ smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n",
+ from_address) >= 0 &&
smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
'2', callout);
}
if (new_domain_record.random_result != ccache_accept && done)
{
+ /* Get the rcpt_include_affixes flag from the transport if there is one,
+ but assume FALSE if there is not. */
+
done =
smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
- addr->address) >= 0 &&
+ transport_rcpt_address(addr,
+ (addr->transport == NULL)? FALSE :
+ addr->transport->rcpt_include_affixes)) >= 0 &&
smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
'2', callout);
if (done)
new_address_record.result = ccache_accept;
else if (errno == 0 && responsebuffer[0] == '5')
+ {
+ *failure_ptr = US"recipient";
new_address_record.result = ccache_reject;
+ }
- /* Do postmaster check if requested */
+ /* Do postmaster check if requested; if a full check is required, we
+ check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
if (done && pm_mailfrom != NULL)
{
smtp_read_response(&inblock, responsebuffer,
sizeof(responsebuffer), '2', callout) &&
+ /* First try using the current domain */
+
+ ((
smtp_write_command(&outblock, FALSE,
"RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 &&
smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout);
+ sizeof(responsebuffer), '2', callout)
+ )
+
+ ||
+
+ /* If that doesn't work, and a full check is requested,
+ try without the domain. */
+
+ (
+ (options & vopt_callout_fullpm) != 0 &&
+ smtp_write_command(&outblock, FALSE,
+ "RCPT TO:<postmaster>\r\n") >= 0 &&
+ smtp_read_response(&inblock, responsebuffer,
+ sizeof(responsebuffer), '2', callout)
+ ));
+
+ /* Sort out the cache record */
new_domain_record.postmaster_stamp = time(NULL);
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 */
+ } /* MAIL FROM: accepted */
/* For any failure of the main check, other than a negative response, we just
close the connection and carry on. We can identify a negative response by the
if (errno == ETIMEDOUT)
{
HDEBUG(D_verify) debug_printf("SMTP timeout\n");
+ send_quit = FALSE;
}
else if (errno == 0)
{
/* End the SMTP conversation and close the connection. */
- (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
- close(inblock.sock);
+ if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
+ (void)close(inblock.sock);
} /* Loop through all hosts, while !done */
/* If we get here with done == TRUE, a successful callout happened, and yield
However, there may be domain-specific information to cache in both cases.
The value of the result field in the new_domain record is ccache_unknown if
-there was an error before or with MAIL FROM:<>, and errno was not zero,
+there was an error before or with MAIL FROM:, and errno was not zero,
implying some kind of I/O error. We don't want to write the cache in that case.
-Otherwise the value is ccache_accept or ccache_reject. */
+Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
if (!callout_no_cache && new_domain_record.result != ccache_unknown)
{
vaddr->user_message = addr->user_message;
vaddr->basic_errno = addr->basic_errno;
vaddr->more_errno = addr->more_errno;
+ vaddr->p.address_data = addr->p.address_data;
+ copyflag(vaddr, addr, af_pass_message);
}
return yield;
}
+/**************************************************
+* printf that automatically handles TLS if needed *
+***************************************************/
+
+/* This function is used by verify_address() as a substitute for all fprintf()
+calls; a direct fprintf() will not produce output in a TLS SMTP session, such
+as a response to an EXPN command. smtp_in.c makes smtp_printf available but
+that assumes that we always use the smtp_out FILE* when not using TLS or the
+ssl buffer when we are. Instead we take a FILE* parameter and check to see if
+that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
+fprintf().
+
+Arguments:
+ f the candidate FILE* to write to
+ format format string
+ ... optional arguments
+
+Returns:
+ nothing
+*/
+
+static void PRINTF_FUNCTION(2,3)
+respond_printf(FILE *f, char *format, ...)
+{
+va_list ap;
+
+va_start(ap, format);
+if (smtp_out && (f == smtp_out))
+ smtp_vprintf(format, ap);
+else
+ fprintf(f, format, ap);
+va_end(ap);
+}
+
+
+
/*************************************************
* Verify an email address *
*************************************************/
rewriting and messages from callouts
vopt_qualify => qualify an unqualified address; else error
vopt_expn => called from SMTP EXPN command
+ vopt_success_on_redirect => when a new address is generated
+ the verification instantly succeeds
These ones are used by do_callout() -- the options variable
is passed to it.
+ vopt_callout_fullpm => if postmaster check, do full one
vopt_callout_no_cache => don't use callout cache
vopt_callout_random => do the "random" thing
vopt_callout_recipsender => use real sender for recipient
vopt_callout_recippmaster => use postmaster for recipient
callout if > 0, specifies that callout is required, and gives timeout
- for individual connections and commands
+ for individual commands
callout_overall if > 0, gives overall timeout for the callout function;
if < 0, a default is used (see do_callout())
+ callout_connect the connection timeout for callouts
se_mailfrom when callout is requested to verify a sender, use this
in MAIL FROM; NULL => ""
pm_mailfrom when callout is requested, if non-NULL, do the postmaster
int
verify_address(address_item *vaddr, FILE *f, int options, int callout,
- int callout_overall, uschar *se_mailfrom, uschar *pm_mailfrom, BOOL *routed)
+ int callout_overall, int callout_connect, uschar *se_mailfrom,
+ uschar *pm_mailfrom, BOOL *routed)
{
BOOL allok = TRUE;
BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0);
BOOL is_recipient = (options & vopt_is_recipient) != 0;
BOOL expn = (options & vopt_expn) != 0;
-
+BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0;
int i;
int yield = OK;
int verify_type = expn? v_expn :
address_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 *ko_prefix, *cr;
uschar *address = vaddr->address;
uschar *save_sender;
uschar null_sender[] = { 0 }; /* Ensure writeable memory */
+/* Clear, just in case */
+
+*failure_ptr = NULL;
+
/* Set up a prefix and suffix for error message which allow us to use the same
output statements both in EXPN mode (where an SMTP response is needed) and when
debugging with an output file. */
if ((options & vopt_qualify) == 0)
{
if (f != NULL)
- fprintf(f, "%sA domain is required for \"%s\"%s\n", ko_prefix, address,
- cr);
+ respond_printf(f, "%sA domain is required for \"%s\"%s\n",
+ ko_prefix, address, cr);
+ *failure_ptr = US"qualify";
return FAIL;
}
address = rewrite_address_qualify(address, is_recipient);
{
host_item *host_list = addr->host_list;
- /* Default, if no remote transport, to NULL for the interface (=> any),
- "smtp" for the port, and "smtp" for the protocol. */
-
- transport_feedback tf = { NULL, US"smtp", US"smtp", NULL, FALSE, FALSE };
+ /* Make up some data for use in the case where there is no remote
+ transport. */
+
+ transport_feedback tf = {
+ NULL, /* interface (=> any) */
+ US"smtp", /* port */
+ US"smtp", /* protocol */
+ NULL, /* hosts */
+ US"$smtp_active_hostname", /* helo_data */
+ FALSE, /* hosts_override */
+ FALSE, /* hosts_randomize */
+ FALSE, /* gethostbyname */
+ TRUE, /* qualify_single */
+ FALSE /* search_parents */
+ };
/* If verification yielded a remote transport, we want to use that
transport's options, so as to mimic what would happen if we were really
if (addr->transport != NULL && !addr->transport->info->local)
{
- (void)(addr->transport->setup)(addr->transport, addr, &tf, NULL);
+ (void)(addr->transport->setup)(addr->transport, addr, &tf, 0, 0, NULL);
/* If the transport has hosts and the router does not, or if the
transport is configured to override the router's hosts, we must build a
if (tf.hosts != NULL && (host_list == NULL || tf.hosts_override))
{
uschar *s;
+ uschar *save_deliver_domain = deliver_domain;
+ uschar *save_deliver_localpart = deliver_localpart;
host_list = NULL; /* Ignore the router's hosts */
deliver_domain = addr->domain;
deliver_localpart = addr->local_part;
s = expand_string(tf.hosts);
- deliver_domain = deliver_localpart = NULL;
+ deliver_domain = save_deliver_domain;
+ deliver_localpart = save_deliver_localpart;
if (s == NULL)
{
}
else
{
+ int flags;
uschar *canonical_name;
- host_item *host;
+ host_item *host, *nexthost;
host_build_hostlist(&host_list, s, tf.hosts_randomize);
/* Just ignore failures to find a host address. If we don't manage
- to find any addresses, the callout will defer. */
+ to find any addresses, the callout will defer. Note that more than
+ one address may be found for a single host, which will result in
+ additional host items being inserted into the chain. Hence we must
+ save the next host first. */
+
+ flags = HOST_FIND_BY_A;
+ if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
+ if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
- for (host = host_list; host != NULL; host = host->next)
+ for (host = host_list; host != NULL; host = nexthost)
{
- if (tf.gethostbyname || string_is_ip_address(host->name, NULL))
- (void)host_find_byname(host, NULL, &canonical_name, TRUE);
+ nexthost = host->next;
+ if (tf.gethostbyname ||
+ string_is_ip_address(host->name, NULL) != 0)
+ (void)host_find_byname(host, NULL, flags, &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! */
+ /* Can only do a callout if we have at least one host! If the callout
+ fails, it will have set ${sender,recipient}_verify_failure. */
if (host_list != NULL)
{
else
{
rc = do_callout(addr, host_list, &tf, callout, callout_overall,
- options, se_mailfrom, pm_mailfrom);
+ callout_connect, options, se_mailfrom, pm_mailfrom);
}
}
else
}
}
+ /* Otherwise, any failure is a routing failure */
+
+ else *failure_ptr = US"route";
+
/* A router may return REROUTED if it has set up a child address as a result
of a change of domain name (typically from widening). In this case we always
want to continue to verify the new child. */
allok = FALSE;
if (f != NULL)
{
- fprintf(f, "%s%s %s", ko_prefix, address,
+ address_item *p = addr->parent;
+
+ respond_printf(f, "%s%s %s", ko_prefix,
+ full_info? addr->address : address,
address_test_mode? "is undeliverable" : "failed to verify");
if (!expn && admin_user)
{
if (addr->basic_errno > 0)
- fprintf(f, ": %s", strerror(addr->basic_errno));
+ respond_printf(f, ": %s", strerror(addr->basic_errno));
if (addr->message != NULL)
- fprintf(f, ":\n %s", addr->message);
+ respond_printf(f, ": %s", addr->message);
}
- fprintf(f, "%s\n", cr);
+
+ /* Show parents iff doing full info */
+
+ if (full_info) while (p != NULL)
+ {
+ respond_printf(f, "%s\n <-- %s", cr, p->address);
+ p = p->parent;
+ }
+ respond_printf(f, "%s\n", cr);
}
if (!full_info) return copy_error(vaddr, addr, FAIL);
allok = FALSE;
if (f != NULL)
{
- fprintf(f, "%s%s cannot be resolved at this time", ko_prefix, address);
+ address_item *p = addr->parent;
+ respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix,
+ full_info? addr->address : address);
if (!expn && admin_user)
{
if (addr->basic_errno > 0)
- fprintf(f, ":\n %s", strerror(addr->basic_errno));
+ respond_printf(f, ": %s", strerror(addr->basic_errno));
if (addr->message != NULL)
- fprintf(f, ":\n %s", addr->message);
+ respond_printf(f, ": %s", addr->message);
else if (addr->basic_errno <= 0)
- fprintf(f, ":\n unknown error");
+ respond_printf(f, ": unknown error");
}
- fprintf(f, "%s\n", cr);
+ /* Show parents iff doing full info */
+
+ if (full_info) while (p != NULL)
+ {
+ respond_printf(f, "%s\n <-- %s", cr, p->address);
+ p = p->parent;
+ }
+ respond_printf(f, "%s\n", cr);
}
if (!full_info) return copy_error(vaddr, addr, DEFER);
else if (yield == OK) yield = DEFER;
}
/* If we are handling EXPN, we do not want to continue to route beyond
- the top level. */
+ the top level (whose address is in "address"). */
else if (expn)
{
if (addr_new == NULL)
{
if (addr_local == NULL && addr_remote == NULL)
- fprintf(f, "250 mail to <%s> is discarded\r\n", address);
+ respond_printf(f, "250 mail to <%s> is discarded\r\n", address);
else
- fprintf(f, "250 <%s>\r\n", address);
+ respond_printf(f, "250 <%s>\r\n", address);
}
else while (addr_new != NULL)
{
address_item *addr2 = addr_new;
addr_new = addr2->next;
if (addr_new == NULL) ok_prefix = US"250 ";
- fprintf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
+ respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
}
return OK;
}
generated address. */
if (!full_info && /* Stop if short info wanted AND */
- (addr_new == NULL || /* No new address OR */
- addr_new->next != NULL || /* More than one new address OR */
- testflag(addr_new, af_pfr))) /* New address is pfr */
+ (((addr_new == NULL || /* No new address OR */
+ addr_new->next != NULL || /* More than one new address OR */
+ testflag(addr_new, af_pfr))) /* New address is pfr */
+ || /* OR */
+ (addr_new != NULL && /* At least one new address AND */
+ success_on_redirect))) /* success_on_redirect is set */
{
if (f != NULL) fprintf(f, "%s %s\n", address,
address_test_mode? "is deliverable" : "verified");
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);
+ return yield;
+ }
-else for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
+for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
{
while (addr_list != NULL)
{
addr_list = addr->next;
fprintf(f, "%s", CS addr->address);
+#ifdef EXPERIMENTAL_SRS
+ if(addr->p.srs_sender)
+ fprintf(f, " [srs = %s]", addr->p.srs_sender);
+#endif
+
+ /* If the address is a duplicate, show something about it. */
+
+ if (!testflag(addr, af_pfr))
+ {
+ tree_node *tnode;
+ if ((tnode = tree_search(tree_duplicates, addr->unique)) != NULL)
+ fprintf(f, " [duplicate, would not be delivered]");
+ else tree_add_duplicate(addr->unique, addr);
+ }
+
+ /* Now show its parents */
+
while (p != NULL)
{
fprintf(f, "\n <-- %s", p->address);
}
}
-return yield; /* Will be DEFER or FAIL if any one address has */
+/* Will be DEFER or FAIL if any one address has, only for full_info (which is
+the -bv or -bt case). */
+
+return yield;
}
{
header_line *h;
uschar *colon, *s;
+int yield = OK;
-for (h = header_list; h != NULL; h = h->next)
+for (h = header_list; h != NULL && yield == OK; h = h->next)
{
if (h->type != htype_from &&
h->type != htype_reply_to &&
s = colon + 1;
while (isspace(*s)) s++;
- parse_allow_group = TRUE; /* Allow group syntax */
+ /* Loop for multiple addresses in the header, enabling group syntax. Note
+ that we have to reset this after the header has been scanned. */
- /* Loop for multiple addresses in the header */
+ parse_allow_group = TRUE;
while (*s != 0)
{
int start, end, domain;
/* Temporarily terminate the string at this point, and extract the
- operative address within. */
+ operative address within, allowing group syntax. */
*ss = 0;
recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
{
uschar *verb = US"is";
uschar *t = ss;
+ uschar *tt = colon;
int len;
/* Arrange not to include any white space at the end in the
- error message. */
+ error message or the header name. */
while (t > s && isspace(t[-1])) t--;
+ while (tt > h->text && isspace(tt[-1])) tt--;
- /* Add the address which failed to the error message, since in a
+ /* Add the address that failed to the error message, since in a
header with very many addresses it is sometimes hard to spot
which one is at fault. However, limit the amount of address to
quote - cases have been seen where, for example, a missing double
}
*msgptr = string_printing(
- string_sprintf("%s: failing address in \"%.*s\" header %s: %.*s",
- errmess, colon - h->text, h->text, verb, len, s));
+ string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
+ errmess, tt - h->text, h->text, verb, len, s));
- return FAIL;
+ yield = FAIL;
+ break; /* Out of address loop */
}
/* Advance to the next address */
s = ss + (terminator? 1:0);
while (isspace(*s)) s++;
} /* Next address */
- } /* Next header */
-return OK;
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
+ } /* Next header unless yield has been set FALSE */
+
+return yield;
}
+/*************************************************
+* Check for blind recipients *
+*************************************************/
+
+/* This function checks that every (envelope) recipient is mentioned in either
+the To: or Cc: header lines, thus detecting blind carbon copies.
+
+There are two ways of scanning that could be used: either scan the header lines
+and tick off the recipients, or scan the recipients and check the header lines.
+The original proposed patch did the former, but I have chosen to do the latter,
+because (a) it requires no memory and (b) will use fewer resources when there
+are many addresses in To: and/or Cc: and only one or two envelope recipients.
+
+Arguments: none
+Returns: OK if there are no blind recipients
+ FAIL if there is at least one blind recipient
+*/
+
+int
+verify_check_notblind(void)
+{
+int i;
+for (i = 0; i < recipients_count; i++)
+ {
+ header_line *h;
+ BOOL found = FALSE;
+ uschar *address = recipients_list[i].address;
+
+ for (h = header_list; !found && h != NULL; h = h->next)
+ {
+ uschar *colon, *s;
+
+ if (h->type != htype_to && h->type != htype_cc) continue;
+
+ colon = Ustrchr(h->text, ':');
+ s = colon + 1;
+ while (isspace(*s)) s++;
+
+ /* Loop for multiple addresses in the header, enabling group syntax. Note
+ that we have to reset this after the header has been scanned. */
+
+ parse_allow_group = TRUE;
+
+ while (*s != 0)
+ {
+ uschar *ss = parse_find_address_end(s, FALSE);
+ uschar *recipient,*errmess;
+ int terminator = *ss;
+ int start, end, domain;
+
+ /* Temporarily terminate the string at this point, and extract the
+ operative address within, allowing group syntax. */
+
+ *ss = 0;
+ recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
+ *ss = terminator;
+
+ /* If we found a valid recipient that has a domain, compare it with the
+ envelope recipient. Local parts are compared case-sensitively, domains
+ case-insensitively. By comparing from the start with length "domain", we
+ include the "@" at the end, which ensures that we are comparing the whole
+ local part of each address. */
+
+ if (recipient != NULL && domain != 0)
+ {
+ found = Ustrncmp(recipient, address, domain) == 0 &&
+ strcmpic(recipient + domain, address + domain) == 0;
+ if (found) break;
+ }
+
+ /* Advance to the next address */
+
+ s = ss + (terminator? 1:0);
+ while (isspace(*s)) s++;
+ } /* Next address */
+
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
+ } /* Next header (if found is false) */
+
+ if (!found) return FAIL;
+ } /* Next recipient */
+
+return OK;
+}
+
+
/*************************************************
* Find if verified sender *
log_msgptr points to where to put a log error message
callout timeout for callout check (passed to verify_address())
callout_overall overall callout timeout (ditto)
+ callout_connect connect callout timeout (ditto)
se_mailfrom mailfrom for verify; NULL => ""
pm_mailfrom sender for pm callout check (passed to verify_address())
options callout options (passed to verify_address())
+ verrno where to put the address basic_errno
If log_msgptr is set to something without setting user_msgptr, the caller
normally uses log_msgptr for both things.
int
verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr,
- int callout, int callout_overall, uschar *se_mailfrom, uschar *pm_mailfrom,
- int options)
+ int callout, int callout_overall, int callout_connect, uschar *se_mailfrom,
+ uschar *pm_mailfrom, int options, int *verrno)
{
static int header_types[] = { htype_sender, htype_reply_to, htype_from };
+BOOL done = FALSE;
int yield = FAIL;
int i;
-for (i = 0; i < 3; i++)
+for (i = 0; i < 3 && !done; i++)
{
header_line *h;
- for (h = header_list; h != NULL; h = h->next)
+ for (h = header_list; h != NULL && !done; h = h->next)
{
int terminator, new_ok;
uschar *s, *ss, *endname;
if (h->type != header_types[i]) continue;
s = endname = Ustrchr(h->text, ':') + 1;
+ /* Scan the addresses in the header, enabling group syntax. Note that we
+ have to reset this after the header has been scanned. */
+
+ parse_allow_group = TRUE;
+
while (*s != 0)
{
address_item *vaddr;
else
{
int start, end, domain;
- uschar *address = parse_extract_address(s, log_msgptr, &start,
- &end, &domain, FALSE);
+ uschar *address = parse_extract_address(s, log_msgptr, &start, &end,
+ &domain, FALSE);
*ss = terminator;
+ /* If we found an empty address, just carry on with the next one, but
+ kill the message. */
+
+ if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0)
+ {
+ *log_msgptr = NULL;
+ s = ss;
+ continue;
+ }
+
/* If verification failed because of a syntax error, fail this
function, and ensure that the failing address gets added to the error
message. */
if (address == NULL)
{
new_ok = FAIL;
- if (*log_msgptr != NULL)
- {
- while (ss > s && isspace(ss[-1])) ss--;
- *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
- "scanning for sender: %s in \"%.*s\"",
- endname - h->text, h->text, *log_msgptr, ss - s, s);
- return FAIL;
- }
+ while (ss > s && isspace(ss[-1])) ss--;
+ *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
+ "scanning for sender: %s in \"%.*s\"",
+ endname - h->text, h->text, *log_msgptr, ss - s, s);
+ yield = FAIL;
+ done = TRUE;
+ break;
}
- /* Else go ahead with the sender verification. But is isn't *the*
+ /* Else go ahead with the sender verification. But it isn't *the*
sender of the message, so set vopt_fake_sender to stop sender_address
being replaced after rewriting or qualification. */
{
vaddr = deliver_make_addr(address, FALSE);
new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender,
- callout, callout_overall, se_mailfrom, pm_mailfrom, NULL);
+ callout, callout_overall, callout_connect, se_mailfrom,
+ pm_mailfrom, NULL);
}
}
last of these will be returned to the user if all three fail. We do not
set a log message - the generic one below will be used. */
- if (new_ok != OK && smtp_return_error_details)
+ if (new_ok != OK)
{
- *user_msgptr = string_sprintf("Rejected after DATA: "
- "could not verify \"%.*s\" header address\n%s: %s",
- endname - h->text, h->text, vaddr->address, vaddr->message);
+ *verrno = vaddr->basic_errno;
+ if (smtp_return_error_details)
+ {
+ *user_msgptr = string_sprintf("Rejected after DATA: "
+ "could not verify \"%.*s\" header address\n%s: %s",
+ endname - h->text, h->text, vaddr->address, vaddr->message);
+ }
}
/* Success or defer */
- if (new_ok == OK) return OK;
+ if (new_ok == OK)
+ {
+ yield = OK;
+ done = TRUE;
+ break;
+ }
+
if (new_ok == DEFER) yield = DEFER;
/* Move on to any more addresses in the header */
s = ss;
- }
- }
- }
+ } /* Next address */
+
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
+ } /* Next header, unless done */
+ } /* Next header type unless done */
if (yield == FAIL && *log_msgptr == NULL)
*log_msgptr = US"there is no valid sender in any header line";
DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident);
END_OFF:
-close(sock);
+(void)close(sock);
return;
}
error for error message when returning ERROR
The block contains:
- host_name the host name or NULL, implying use sender_host_name and
- sender_host_aliases, looking them up if required
+ host_name (a) the host name, or
+ (b) NULL, implying use sender_host_name and
+ sender_host_aliases, looking them up if required, or
+ (c) the empty string, meaning that only IP address matches
+ are permitted
host_address the host address
host_ipv4 the IPv4 address taken from an IPv6 one
Returns: OK matched
FAIL did not match
DEFER lookup deferred
- ERROR failed to find the host name or IP address
- unknown lookup type specified
+ ERROR (a) failed to find the host name or IP address, or
+ (b) unknown lookup type specified, or
+ (c) host name encountered when only IP addresses are
+ being matched
*/
-static int
+int
check_host(void *arg, uschar *ss, uschar **valueptr, uschar **error)
{
check_host_block *cb = (check_host_block *)arg;
+int mlen = -1;
int maskoffset;
+BOOL iplookup = FALSE;
BOOL isquery = FALSE;
-uschar *semicolon, *t;
+BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0;
+uschar *t;
+uschar *semicolon;
uschar **aliases;
/* Optimize for the special case when the pattern is "*". */
if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL;
if (*ss == 0) return FAIL;
-/* If the pattern is precisely "@" then match against the primary host name;
-if it's "@[]" match against the local host's IP addresses. */
+/* If the pattern is precisely "@" then match against the primary host name,
+provided that host name matching is permitted; if it's "@[]" match against the
+local host's IP addresses. */
if (*ss == '@')
{
- if (ss[1] == 0) ss = primary_hostname;
+ if (ss[1] == 0)
+ {
+ if (isiponly) return ERROR;
+ ss = primary_hostname;
+ }
else if (Ustrcmp(ss, "@[]") == 0)
{
ip_address_item *ip;
/* If the pattern is an IP address, optionally followed by a bitmask count, do
a (possibly masked) comparision with the current IP address. */
-if (string_is_ip_address(ss, &maskoffset))
+if (string_is_ip_address(ss, &maskoffset) != 0)
return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
-/* If the item is of the form net[n]-lookup;<file|query> then it is a lookup on
-a masked IP network, in textual form. The net- stuff really only applies to
-single-key lookups where the key is implicit. For query-style lookups the key
-is specified in the query. From release 4.30, the use of net- for query style
-is no longer needed, but we retain it for backward compatibility. */
-
-if (Ustrncmp(ss, "net", 3) == 0 && (semicolon = Ustrchr(ss, ';')) != NULL)
+/* The pattern is not an IP address. A common error that people make is to omit
+one component of an IPv4 address, either by accident, or believing that, for
+example, 1.2.3/24 is the same as 1.2.3.0/24, or 1.2.3 is the same as 1.2.3.0,
+which it isn't. (Those applications that do accept 1.2.3 as an IP address
+interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an
+ancient specification.) To aid in debugging these cases, we give a specific
+error if the pattern contains only digits and dots or contains a slash preceded
+only by digits and dots (a slash at the start indicates a file name and of
+course slashes may be present in lookups, but not preceded only by digits and
+dots). */
+
+for (t = ss; isdigit(*t) || *t == '.'; t++);
+if (*t == 0 || (*t == '/' && t != ss))
{
- int mlen = 0;
- for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
- if (*t++ == '-')
- {
- int insize;
- int search_type;
- int incoming[4];
- void *handle;
- uschar *filename, *key, *result;
- uschar buffer[64];
+ *error = US"malformed IPv4 address or address mask";
+ return ERROR;
+ }
- /* If no mask was supplied, set a negative value */
+/* See if there is a semicolon in the pattern */
- if (mlen == 0 && t == ss+4) mlen = -1;
+semicolon = Ustrchr(ss, ';');
- /* Find the search type */
+/* If we are doing an IP address only match, then all lookups must be IP
+address lookups, even if there is no "net-". */
- search_type = search_findtype(t, semicolon - t);
+if (isiponly)
+ {
+ iplookup = semicolon != NULL;
+ }
- if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
- search_error_message);
+/* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
+a lookup on a masked IP network, in textual form. We obey this code even if we
+have already set iplookup, so as to skip over the "net-" prefix and to set the
+mask length. The net- stuff really only applies to single-key lookups where the
+key is implicit. For query-style lookups the key is specified in the query.
+From release 4.30, the use of net- for query style is no longer needed, but we
+retain it for backward compatibility. */
- /* Adjust parameters for the type of lookup. For a query-style
- lookup, there is no file name, and the "key" is just the query. For
- a single-key lookup, the key is the current IP address, masked
- appropriately, and reconverted to text form, with the mask appended. */
+if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL)
+ {
+ mlen = 0;
+ for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
+ if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */
+ iplookup = (*t++ == '-');
+ }
+else t = ss;
- if (mac_islookup(search_type, lookup_querystyle))
- {
- filename = NULL;
- key = semicolon + 1;
- }
- else
- {
- insize = host_aton(cb->host_address, incoming);
- host_mask(insize, incoming, mlen);
- (void)host_nmtoa(insize, incoming, mlen, buffer);
- key = buffer;
- filename = semicolon + 1;
- }
+/* Do the IP address lookup if that is indeed what we have */
- /* Now do the actual lookup; note that there is no search_close() because
- of the caching arrangements. */
+if (iplookup)
+ {
+ int insize;
+ int search_type;
+ int incoming[4];
+ void *handle;
+ uschar *filename, *key, *result;
+ uschar buffer[64];
+
+ /* Find the search type */
+
+ search_type = search_findtype(t, semicolon - t);
+
+ if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
+ search_error_message);
+
+ /* Adjust parameters for the type of lookup. For a query-style lookup, there
+ is no file name, and the "key" is just the query. For query-style with a file
+ name, we have to fish the file off the start of the query. For a single-key
+ lookup, the key is the current IP address, masked appropriately, and
+ reconverted to text form, with the mask appended. For IPv6 addresses, specify
+ dot separators instead of colons, except when the lookup type is "iplsearch".
+ */
- handle = search_open(filename, search_type, 0, NULL, NULL);
- if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
- search_error_message);
- result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
- if (valueptr != NULL) *valueptr = result;
- return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
+ if (mac_islookup(search_type, lookup_absfilequery))
+ {
+ filename = semicolon + 1;
+ key = filename;
+ while (*key != 0 && !isspace(*key)) key++;
+ filename = string_copyn(filename, key - filename);
+ while (isspace(*key)) key++;
}
+ else if (mac_islookup(search_type, lookup_querystyle))
+ {
+ filename = NULL;
+ key = semicolon + 1;
+ }
+ else /* Single-key style */
+ {
+ int sep = (Ustrcmp(lookup_list[search_type].name, "iplsearch") == 0)?
+ ':' : '.';
+ insize = host_aton(cb->host_address, incoming);
+ host_mask(insize, incoming, mlen);
+ (void)host_nmtoa(insize, incoming, mlen, buffer, sep);
+ key = buffer;
+ filename = semicolon + 1;
+ }
+
+ /* Now do the actual lookup; note that there is no search_close() because
+ of the caching arrangements. */
+
+ handle = search_open(filename, search_type, 0, NULL, NULL);
+ if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
+ search_error_message);
+ result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
+ if (valueptr != NULL) *valueptr = result;
+ return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
}
/* The pattern is not an IP address or network reference of any kind. That is,
-it is a host name pattern. Check the characters of the pattern to see if they
-comprise only letters, digits, full stops, and hyphens (the constituents of
-domain names). Allow underscores, as they are all too commonly found. Sigh.
-Also, if allow_utf8_domains is set, allow top-bit characters. */
+it is a host name pattern. If this is an IP only match, there's an error in the
+host list. */
+
+if (isiponly)
+ {
+ *error = US"cannot match host name in match_ip list";
+ return ERROR;
+ }
+
+/* Check the characters of the pattern to see if they comprise only letters,
+digits, full stops, and hyphens (the constituents of domain names). Allow
+underscores, as they are all too commonly found. Sigh. Also, if
+allow_utf8_domains is set, allow top-bit characters. */
for (t = ss; *t != 0; t++)
if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' &&
h.name = ss;
h.address = NULL;
h.mx = MX_NONE;
- rc = host_find_byname(&h, NULL, NULL, FALSE);
+
+ rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE);
if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
{
host_item *hh;
for (hh = &h; hh != NULL; hh = hh->next)
{
- if (Ustrcmp(hh->address, (Ustrchr(hh->address, ':') == NULL)?
- cb->host_ipv4 : cb->host_address) == 0)
- return OK;
+ if (host_is_in_net(hh->address, cb->host_address, 0)) return OK;
}
return FAIL;
}
search_error_message, ss);
return DEFER;
}
- isquery = mac_islookup(id, lookup_querystyle);
+ isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery);
}
if (isquery)
verify_check_this_host(uschar **listptr, unsigned int *cache_bits,
uschar *host_name, uschar *host_address, 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;
cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)?
host_address + 7 : host_address;
-return match_check_list(listptr, 0, &hostlist_anchor, &local_cache_bits,
- check_host, &cb, MCL_HOST,
- (host_address == sender_host_address)? US"host" : host_address, valueptr);
+/* During the running of the check, put the IP address into $host_address. In
+the case of calls from the smtp transport, it will already be there. However,
+in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
+the safe side, any existing setting is preserved, though as I write this
+(November 2004) I can't see any cases where it is actually needed. */
+
+deliver_host_address = host_address;
+rc = match_check_list(
+ listptr, /* the list */
+ 0, /* separator character */
+ &hostlist_anchor, /* anchor pointer */
+ &local_cache_bits, /* cache pointer */
+ check_host, /* function for testing */
+ &cb, /* argument for function */
+ MCL_HOST, /* type of check */
+ (host_address == sender_host_address)?
+ US"host" : host_address, /* text for debugging */
+ valueptr); /* where to pass back data */
+deliver_host_address = save_host_address;
+return rc;
}
}
}
#endif
+
+/* Remove trailing period -- this is needed so that both arbitrary
+dnsbl keydomains and inverted addresses may be combined with the
+same format string, "%s.%s" */
+
+*(--bptr) = 0;
+}
+
+
+
+/*************************************************
+* Perform a single dnsbl lookup *
+*************************************************/
+
+/* This function is called from verify_check_dnsbl() below. It is also called
+recursively from within itself when domain and domain_txt are different
+pointers, in order to get the TXT record from the alternate domain.
+
+Arguments:
+ domain the outer dnsbl domain
+ domain_txt alternate domain to lookup TXT record on success; when the
+ same domain is to be used, domain_txt == domain (that is,
+ the pointers must be identical, not just the text)
+ keydomain the current keydomain (for debug message)
+ prepend subdomain to lookup (like keydomain, but
+ reversed if IP address)
+ iplist the list of matching IP addresses, or NULL for "any"
+ bitmask true if bitmask matching is wanted
+ match_type condition for 'succeed' result
+ 0 => Any RR in iplist (=)
+ 1 => No RR in iplist (!=)
+ 2 => All RRs in iplist (==)
+ 3 => Some RRs not in iplist (!==)
+ the two bits are defined as MT_NOT and MT_ALL
+ defer_return what to return for a defer
+
+Returns: OK if lookup succeeded
+ FAIL if not
+*/
+
+static int
+one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain,
+ uschar *prepend, uschar *iplist, BOOL bitmask, int match_type,
+ int defer_return)
+{
+dns_answer dnsa;
+dns_scan dnss;
+tree_node *t;
+dnsbl_cache_block *cb;
+int old_pool = store_pool;
+uschar query[256]; /* DNS domain max length */
+
+/* Construct the specific query domainname */
+
+if (!string_format(query, sizeof(query), "%s.%s", prepend, domain))
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
+ "(ignored): %s...", query);
+ return FAIL;
+ }
+
+/* Look for this query in the cache. */
+
+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. */
+
+if (t == NULL)
+ {
+ store_pool = POOL_PERM;
+
+ /* Set up a tree entry to cache the lookup */
+
+ t = store_get(sizeof(tree_node) + Ustrlen(query));
+ Ustrcpy(t->name, query);
+ t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
+ (void)tree_insertnode(&dnsbl_cache, t);
+
+ /* Do the DNS loopup . */
+
+ HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query);
+ cb->rc = dns_basic_lookup(&dnsa, query, T_A);
+ cb->text_set = FALSE;
+ cb->text = NULL;
+ cb->rhs = NULL;
+
+ /* If the lookup succeeded, cache the RHS address. The code allows for
+ more than one address - this was for complete generality and the possible
+ use of A6 records. However, A6 records have been reduced to experimental
+ status (August 2001) and may die out. So they may never get used at all,
+ let alone in dnsbl records. However, leave the code here, just in case.
+
+ Quite apart from one A6 RR generating multiple addresses, there are DNS
+ lists that return more than one A record, so we must handle multiple
+ addresses generated in that way as well. */
+
+ if (cb->rc == DNS_SUCCEED)
+ {
+ dns_record *rr;
+ dns_address **addrp = &(cb->rhs);
+ for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ rr != NULL;
+ rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
+ {
+ if (rr->type == T_A)
+ {
+ dns_address *da = dns_address_from_rr(&dnsa, rr);
+ if (da != NULL)
+ {
+ *addrp = da;
+ while (da->next != NULL) da = da->next;
+ addrp = &(da->next);
+ }
+ }
+ }
+
+ /* If we didn't find any A records, change the return code. This can
+ happen when there is a CNAME record but there are no A records for what
+ it points to. */
+
+ if (cb->rhs == NULL) cb->rc = DNS_NODATA;
+ }
+
+ store_pool = old_pool;
+ }
+
+/* Previous lookup was cached */
+
+else
+ {
+ HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
+ cb = t->data.ptr;
+ }
+
+/* We now have the result of the DNS lookup, either newly done, or cached
+from a previous call. If the lookup succeeded, check against the address
+list if there is one. This may be a positive equality list (introduced by
+"="), a negative equality list (introduced by "!="), a positive bitmask
+list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
+
+if (cb->rc == DNS_SUCCEED)
+ {
+ dns_address *da = NULL;
+ uschar *addlist = cb->rhs->address;
+
+ /* For A and AAAA records, there may be multiple addresses from multiple
+ records. For A6 records (currently not expected to be used) there may be
+ multiple addresses from a single record. */
+
+ for (da = cb->rhs->next; da != NULL; da = da->next)
+ addlist = string_sprintf("%s, %s", addlist, da->address);
+
+ HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
+ query, addlist);
+
+ /* Address list check; this can be either for equality, or via a bitmask.
+ In the latter case, all the bits must match. */
+
+ if (iplist != NULL)
+ {
+ for (da = cb->rhs; da != NULL; da = da->next)
+ {
+ int ipsep = ',';
+ uschar ip[46];
+ uschar *ptr = iplist;
+ uschar *res;
+
+ /* Handle exact matching */
+
+ if (!bitmask)
+ {
+ while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
+ {
+ if (Ustrcmp(CS da->address, ip) == 0) break;
+ }
+ }
+
+ /* Handle bitmask matching */
+
+ else
+ {
+ int address[4];
+ int mask = 0;
+
+ /* At present, all known DNS blocking lists use A records, with
+ IPv4 addresses on the RHS encoding the information they return. I
+ wonder if this will linger on as the last vestige of IPv4 when IPv6
+ is ubiquitous? Anyway, for now we use paranoia code to completely
+ ignore IPv6 addresses. The default mask is 0, which always matches.
+ We change this only for IPv4 addresses in the list. */
+
+ if (host_aton(da->address, address) == 1) mask = address[0];
+
+ /* Scan the returned addresses, skipping any that are IPv6 */
+
+ while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
+ {
+ if (host_aton(ip, address) != 1) continue;
+ if ((address[0] & mask) == address[0]) break;
+ }
+ }
+
+ /* If either
+
+ (a) An IP address in an any ('=') list matched, or
+ (b) No IP address in an all ('==') list matched
+
+ then we're done searching. */
+
+ if (((match_type & MT_ALL) != 0) == (res == NULL)) break;
+ }
+
+ /* If da == NULL, either
+
+ (a) No IP address in an any ('=') list matched, or
+ (b) An IP address in an all ('==') list didn't match
+
+ so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on
+ the list. */
+
+ if ((match_type == MT_NOT || match_type == MT_ALL) != (da == NULL))
+ {
+ HDEBUG(D_dnsbl)
+ {
+ uschar *res = NULL;
+ switch(match_type)
+ {
+ case 0:
+ res = US"was no match";
+ break;
+ case MT_NOT:
+ res = US"was an exclude match";
+ break;
+ case MT_ALL:
+ res = US"was an IP address that did not match";
+ break;
+ case MT_NOT|MT_ALL:
+ res = US"were no IP addresses that did not match";
+ break;
+ }
+ debug_printf("=> but we are not accepting this block class because\n");
+ debug_printf("=> there %s for %s%c%s\n",
+ res,
+ ((match_type & MT_ALL) == 0)? "" : "=",
+ bitmask? '&' : '=', iplist);
+ }
+ return FAIL;
+ }
+ }
+
+ /* Either there was no IP list, or the record matched, implying that the
+ domain is on the list. We now want to find a corresponding TXT record. If an
+ alternate domain is specified for the TXT record, call this function
+ recursively to look that up; this has the side effect of re-checking that
+ there is indeed an A record at the alternate domain. */
+
+ if (domain_txt != domain)
+ return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL,
+ FALSE, match_type, defer_return);
+
+ /* If there is no alternate domain, look up a TXT record in the main domain
+ if it has not previously been cached. */
+
+ if (!cb->text_set)
+ {
+ cb->text_set = TRUE;
+ if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED)
+ {
+ dns_record *rr;
+ for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ rr != NULL;
+ rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
+ if (rr->type == T_TXT) break;
+ if (rr != NULL)
+ {
+ int len = (rr->data)[0];
+ if (len > 511) len = 127;
+ store_pool = POOL_PERM;
+ cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1));
+ store_pool = old_pool;
+ }
+ }
+ }
+
+ dnslist_value = addlist;
+ dnslist_text = cb->text;
+ return OK;
+ }
+
+/* There was a problem with the DNS lookup */
+
+if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA)
+ {
+ log_write(L_dnslist_defer, LOG_MAIN,
+ "DNS list lookup defer (probably timeout) for %s: %s", query,
+ (defer_return == OK)? US"assumed in list" :
+ (defer_return == FAIL)? US"assumed not in list" :
+ US"returned DEFER");
+ return defer_return;
+ }
+
+/* No entry was found in the DNS; continue for next domain */
+
+HDEBUG(D_dnsbl)
+ {
+ debug_printf("DNS lookup for %s failed\n", query);
+ debug_printf("=> that means %s is not listed at %s\n",
+ keydomain, domain);
+ }
+
+return FAIL;
}
+
/*************************************************
* Check host against DNS black lists *
*************************************************/
If no key is given, what is looked up in the domain is the inverted IP address
of the current client host. If a key is given, it is used to construct the
-domain for the lookup. For example,
+domain for the lookup. For example:
dsn.rfc-ignorant.org/$sender_address_domain
value in $dnslist_text. We also cache everything in a tree, to optimize
multiple lookups.
+The TXT record is normally looked up in the same domain as the A record, but
+when many lists are combined in a single DNS domain, this will not be a very
+specific message. It is possible to specify a different domain for looking up
+TXT records; this is given before the main domain, comma-separated. For
+example:
+
+ dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \
+ socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3
+
+The caching ensures that only one lookup in dnsbl.sorbs.net is done.
+
Note: an address for testing RBL is 192.203.178.39
Note: an address for testing DUL is 192.203.178.4
Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org
{
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 */
/* Indicate that the inverted IP address is not yet set up */
revadd[0] = 0;
+/* In case this is the first time the DNS resolver is being used. */
+
+dns_init(FALSE, FALSE);
+
/* Loop through all the domains supplied, until something matches */
while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
{
- BOOL frc;
+ int rc;
BOOL bitmask = FALSE;
- dns_answer dnsa;
- dns_scan dnss;
+ int match_type = 0;
+ uschar *domain_txt;
+ uschar *comma;
uschar *iplist;
uschar *key;
- tree_node *t;
- dnsbl_cache_block *cb;
HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain);
if (key != NULL) *key++ = 0;
/* See if there's a list of addresses supplied after the domain name. This is
- introduced by an = or a & character; if preceded by ! we invert the result.
- */
+ introduced by an = or a & character; if preceded by = we require all matches
+ and if preceded by ! we invert the result. */
iplist = Ustrchr(domain, '=');
if (iplist == NULL)
iplist = Ustrchr(domain, '&');
}
- if (iplist != NULL)
+ if (iplist != NULL) /* Found either = or & */
{
- if (iplist > domain && iplist[-1] == '!')
+ if (iplist > domain && iplist[-1] == '!') /* Handle preceding ! */
{
- invert_result = TRUE;
+ match_type |= MT_NOT;
iplist[-1] = 0;
}
- *iplist++ = 0;
+
+ *iplist++ = 0; /* Terminate domain, move on */
+
+ /* If we found = (bitmask == FALSE), check for == or =& */
+
+ if (!bitmask && (*iplist == '=' || *iplist == '&'))
+ {
+ bitmask = *iplist++ == '&';
+ match_type |= MT_ALL;
+ }
+ }
+
+ /* If there is a comma in the domain, it indicates that a second domain for
+ looking up TXT records is provided, before the main domain. Otherwise we must
+ set domain_txt == domain. */
+
+ domain_txt = domain;
+ comma = Ustrchr(domain, ',');
+ if (comma != NULL)
+ {
+ *comma++ = 0;
+ domain = comma;
}
/* Check that what we have left is a sensible domain name. There is no reason
}
}
- /* 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);
- }
+ /* Check the alternate domain if present */
- if (!frc)
+ if (domain_txt != domain) for (s = domain_txt; *s != 0; s++)
{
- log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
- "(ignored): %s...", query);
- continue;
+ if (!isalnum(*s) && *s != '-' && *s != '.')
+ {
+ log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
+ "strange characters - is this right?", domain_txt);
+ break;
+ }
}
- /* Look for this query in the cache. */
-
- t = tree_search(dnsbl_cache, query);
-
- /* If not cached from a previous lookup, we must do a DNS lookup, and
- cache the result in permanent memory. */
+ /* If there is no key string, construct the query by adding the domain name
+ onto the inverted host address, and perform a single DNS lookup. */
- if (t == NULL)
+ if (key == NULL)
{
- store_pool = POOL_PERM;
-
- /* In case this is the first time the DNS resolver is being used. */
-
- dns_init(FALSE, FALSE);
-
- /* Set up a tree entry to cache the lookup */
-
- t = store_get(sizeof(tree_node) + Ustrlen(query));
- Ustrcpy(t->name, query);
- t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
- (void)tree_insertnode(&dnsbl_cache, t);
-
- /* Do the DNS loopup . */
-
- HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query);
- cb->rc = dns_basic_lookup(&dnsa, query, T_A);
- cb->text_set = FALSE;
- cb->text = NULL;
- cb->rhs = NULL;
-
- /* If the lookup succeeded, cache the RHS address. The code allows for
- more than one address - this was for complete generality and the possible
- use of A6 records. However, A6 records have been reduced to experimental
- status (August 2001) and may die out. So they may never get used at all,
- let alone in dnsbl records. However, leave the code here, just in case.
-
- Quite apart from one A6 RR generating multiple addresses, there are DNS
- lists that return more than one A record, so we must handle multiple
- addresses generated in that way as well. */
-
- if (cb->rc == DNS_SUCCEED)
+ if (sender_host_address == NULL) return FAIL; /* can never match */
+ if (revadd[0] == 0) invert_address(revadd, sender_host_address);
+ rc = one_check_dnsbl(domain, domain_txt, sender_host_address, revadd,
+ iplist, bitmask, match_type, defer_return);
+ if (rc == OK)
{
- dns_record *rr;
- dns_address **addrp = &(cb->rhs);
- for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
- {
- if (rr->type == T_A)
- {
- dns_address *da = dns_address_from_rr(&dnsa, rr);
- if (da != NULL)
- {
- *addrp = da;
- while (da->next != NULL) da = da->next;
- addrp = &(da->next);
- }
- }
- }
-
- /* If we didn't find any A records, change the return code. This can
- happen when there is a CNAME record but there are no A records for what
- it points to. */
-
- if (cb->rhs == NULL) cb->rc = DNS_NODATA;
+ dnslist_domain = string_copy(domain_txt);
+ dnslist_matched = string_copy(sender_host_address);
+ HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
+ sender_host_address, dnslist_domain);
}
-
- store_pool = old_pool;
+ if (rc != FAIL) return rc; /* OK or DEFER */
}
- /* Previous lookup was cached */
+ /* If there is a key string, it can be a list of domains or IP addresses to
+ be concatenated with the main domain. */
else
{
- HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
- cb = t->data.ptr;
- }
-
- /* We now have the result of the DNS lookup, either newly done, or cached
- from a previous call. If the lookup succeeded, check against the address
- list if there is one. This may be a positive equality list (introduced by
- "="), a negative equality list (introduced by "!="), a positive bitmask
- list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
-
- if (cb->rc == DNS_SUCCEED)
- {
- dns_address *da = NULL;
- uschar *addlist = cb->rhs->address;
-
- /* For A and AAAA records, there may be multiple addresses from multiple
- records. For A6 records (currently not expected to be used) there may be
- multiple addresses from a single record. */
-
- for (da = cb->rhs->next; da != NULL; da = da->next)
- addlist = string_sprintf("%s, %s", addlist, da->address);
-
- HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
- query, addlist);
-
- /* Address list check; this can be either for equality, or via a bitmask.
- In the latter case, all the bits must match. */
-
- if (iplist != NULL)
+ int keysep = 0;
+ BOOL defer = FALSE;
+ uschar *keydomain;
+ uschar keybuffer[256];
+ uschar keyrevadd[128];
+
+ while ((keydomain = string_nextinlist(&key, &keysep, keybuffer,
+ sizeof(keybuffer))) != NULL)
{
- int ipsep = ',';
- uschar ip[46];
- uschar *ptr = iplist;
+ uschar *prepend = keydomain;
- while (string_nextinlist(&ptr, &ipsep, ip, sizeof(ip)) != NULL)
+ if (string_is_ip_address(keydomain, NULL) != 0)
{
- /* Handle exact matching */
- if (!bitmask)
- {
- for (da = cb->rhs; da != NULL; da = da->next)
- {
- if (Ustrcmp(CS da->address, ip) == 0) break;
- }
- }
- /* Handle bitmask matching */
- else
- {
- int address[4];
- int mask = 0;
-
- /* At present, all known DNS blocking lists use A records, with
- IPv4 addresses on the RHS encoding the information they return. I
- wonder if this will linger on as the last vestige of IPv4 when IPv6
- is ubiquitous? Anyway, for now we use paranoia code to completely
- ignore IPv6 addresses. The default mask is 0, which always matches.
- We change this only for IPv4 addresses in the list. */
-
- if (host_aton(ip, address) == 1) mask = address[0];
-
- /* Scan the returned addresses, skipping any that are IPv6 */
-
- for (da = cb->rhs; da != NULL; da = da->next)
- {
- if (host_aton(da->address, address) != 1) continue;
- if ((address[0] & mask) == mask) break;
- }
- }
-
- /* Break out if a match has been found */
-
- if (da != NULL) break;
+ invert_address(keyrevadd, keydomain);
+ prepend = keyrevadd;
}
- /* If either
-
- (a) No IP address in a positive list matched, or
- (b) An IP address in a negative list did match
-
- then behave as if the DNSBL lookup had not succeeded, i.e. the host is
- not on the list. */
+ rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist,
+ bitmask, match_type, defer_return);
- if (invert_result != (da == NULL))
+ if (rc == OK)
{
- 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 */
+ dnslist_domain = string_copy(domain_txt);
+ dnslist_matched = string_copy(keydomain);
+ HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
+ keydomain, dnslist_domain);
+ return OK;
}
- }
- /* Either there was no IP list, or the record matched. Look up a TXT record
- if it hasn't previously been done. */
+ /* If the lookup deferred, remember this fact. We keep trying the rest
+ of the list to see if we get a useful result, and if we don't, we return
+ DEFER at the end. */
- if (!cb->text_set)
- {
- cb->text_set = TRUE;
- if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED)
- {
- dns_record *rr;
- for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
- if (rr->type == T_TXT) break;
- if (rr != NULL)
- {
- int len = (rr->data)[0];
- if (len > 511) len = 127;
- store_pool = POOL_PERM;
- cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1));
- store_pool = old_pool;
- }
- }
- }
+ if (rc == DEFER) defer = TRUE;
+ } /* continue with next keystring domain/address */
- HDEBUG(D_dnsbl)
- {
- debug_printf("=> that means %s is listed at %s\n",
- (key == NULL)? sender_host_address : key, domain);
- }
-
- dnslist_domain = string_copy(domain);
- dnslist_value = addlist;
- dnslist_text = cb->text;
- return OK;
- }
-
- /* There was a problem with the DNS lookup */
-
- if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA)
- {
- log_write(L_dnslist_defer, LOG_MAIN,
- "DNS list lookup defer (probably timeout) for %s: %s", query,
- (defer_return == OK)? US"assumed in list" :
- (defer_return == FAIL)? US"assumed not in list" :
- US"returned DEFER");
- return defer_return;
- }
-
- /* 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);
+ if (defer) return DEFER;
}
- } /* Continue with next domain */
+ } /* continue with next dnsdb outer domain */
return FAIL;
}
git://git.exim.org / exim.git / blobdiff