-/* $Cambridge: exim/src/src/verify.c,v 1.42 2006/10/09 14:36:25 ph10 Exp $ */
+/* $Cambridge: exim/src/src/verify.c,v 1.55 2010/06/05 23:50:18 pdp Exp $ */
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2006 */
+/* Copyright (c) University of Cambridge 1995 - 2009 */
/* 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 *
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. */
log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
addr->message);
- /* 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 (active_hostname == NULL)
- log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: failed to expand transport's "
- "helo_data value for callout: %s", expand_string_message);
- else active_hostname = s;
- }
-
- deliver_host = deliver_host_address = NULL;
- deliver_domain = save_deliver_domain;
-
/* Set HELO string according to the protocol */
if (Ustrcmp(tf->protocol, "lmtp") == 0) helo = US"LHLO";
{
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;
}
+ /* 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. */
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
+ vfprintf(f, format, ap);
+va_end(ap);
+}
+
+
+
/*************************************************
* Verify an email address *
*************************************************/
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_item *p = addr->parent;
- fprintf(f, "%s%s %s", ko_prefix, full_info? addr->address : address,
+ 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, ": %s", addr->message);
+ respond_printf(f, ": %s", addr->message);
}
/* Show parents iff doing full info */
if (full_info) while (p != NULL)
{
- fprintf(f, "%s\n <-- %s", cr, p->address);
+ respond_printf(f, "%s\n <-- %s", cr, p->address);
p = p->parent;
}
- fprintf(f, "%s\n", cr);
+ respond_printf(f, "%s\n", cr);
}
if (!full_info) return copy_error(vaddr, addr, FAIL);
if (f != NULL)
{
address_item *p = addr->parent;
- fprintf(f, "%s%s cannot be resolved at this time", ko_prefix,
+ 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, ": %s", strerror(addr->basic_errno));
+ respond_printf(f, ": %s", strerror(addr->basic_errno));
if (addr->message != NULL)
- fprintf(f, ": %s", addr->message);
+ respond_printf(f, ": %s", addr->message);
else if (addr->basic_errno <= 0)
- fprintf(f, ": unknown error");
+ respond_printf(f, ": unknown error");
}
/* Show parents iff doing full info */
if (full_info) while (p != NULL)
{
- fprintf(f, "%s\n <-- %s", cr, p->address);
+ respond_printf(f, "%s\n <-- %s", cr, p->address);
p = p->parent;
}
- fprintf(f, "%s\n", cr);
+ respond_printf(f, "%s\n", cr);
}
-
if (!full_info) return copy_error(vaddr, addr, DEFER);
else if (yield == OK) yield = DEFER;
}
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;
}
{
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);
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;
}
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);
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;
uschar *pm_mailfrom, int options, int *verrno)
{
static int header_types[] = { htype_sender, htype_reply_to, htype_from };
+BOOL done = FALSE;
int yield = FAIL;
int i;
-for (i = 0; i < 3; i++)
+for (i = 0; i < 3 && !done; i++)
{
header_line *h;
- for (h = header_list; h != NULL; h = h->next)
+ for (h = header_list; h != NULL && !done; h = h->next)
{
int terminator, new_ok;
uschar *s, *ss, *endname;
if (h->type != header_types[i]) continue;
s = endname = Ustrchr(h->text, ':') + 1;
+ /* Scan the addresses in the header, enabling group syntax. Note that we
+ have to reset this after the header has been scanned. */
+
+ parse_allow_group = TRUE;
+
while (*s != 0)
{
address_item *vaddr;
else
{
int start, end, domain;
- uschar *address = parse_extract_address(s, log_msgptr, &start,
- &end, &domain, FALSE);
+ uschar *address = parse_extract_address(s, log_msgptr, &start, &end,
+ &domain, FALSE);
*ss = terminator;
+ /* If we found an empty address, just carry on with the next one, but
+ kill the message. */
+
+ if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0)
+ {
+ *log_msgptr = NULL;
+ s = ss;
+ continue;
+ }
+
/* If verification failed because of a syntax error, fail this
function, and ensure that the failing address gets added to the error
message. */
if (address == NULL)
{
new_ok = FAIL;
- if (*log_msgptr != NULL)
- {
- while (ss > s && isspace(ss[-1])) ss--;
- *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
- "scanning for sender: %s in \"%.*s\"",
- endname - h->text, h->text, *log_msgptr, ss - s, s);
- return FAIL;
- }
+ while (ss > s && isspace(ss[-1])) ss--;
+ *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
+ "scanning for sender: %s in \"%.*s\"",
+ endname - h->text, h->text, *log_msgptr, ss - s, s);
+ yield = FAIL;
+ done = TRUE;
+ break;
}
/* Else go ahead with the sender verification. But it isn't *the*
/* Success or defer */
- if (new_ok == OK) return OK;
+ if (new_ok == OK)
+ {
+ yield = OK;
+ done = TRUE;
+ break;
+ }
+
if (new_ok == DEFER) yield = DEFER;
/* Move on to any more addresses in the header */
s = ss;
- }
- }
- }
+ } /* Next address */
+
+ parse_allow_group = FALSE;
+ parse_found_group = FALSE;
+ } /* Next header, unless done */
+ } /* Next header type unless done */
if (yield == FAIL && *log_msgptr == NULL)
*log_msgptr = US"there is no valid sender in any header line";
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. */
+ dot separators instead of colons, except when the lookup type is "iplsearch".
+ */
if (mac_islookup(search_type, lookup_absfilequery))
{
filename = NULL;
key = semicolon + 1;
}
- else
+ else /* Single-key style */
{
+ int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)?
+ ':' : '.';
insize = host_aton(cb->host_address, incoming);
host_mask(insize, incoming, mlen);
- (void)host_nmtoa(insize, incoming, mlen, buffer, '.');
+ (void)host_nmtoa(insize, incoming, mlen, buffer, sep);
key = buffer;
filename = semicolon + 1;
}
/*************************************************
-* 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];
reversed if IP address)
iplist the list of matching IP addresses, or NULL for "any"
bitmask true if bitmask matching is wanted
- invert_result true if result to be inverted
+ match_type condition for 'succeed' result
+ 0 => Any RR in iplist (=)
+ 1 => No RR in iplist (!=)
+ 2 => All RRs in iplist (==)
+ 3 => Some RRs not in iplist (!==)
+ the two bits are defined as MT_NOT and MT_ALL
defer_return what to return for a defer
Returns: OK if lookup succeeded
static int
one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain,
- uschar *prepend, uschar *iplist, BOOL bitmask, BOOL invert_result,
+ uschar *prepend, uschar *iplist, BOOL bitmask, int match_type,
int defer_return)
{
dns_answer dnsa;
if (iplist != NULL)
{
- int ipsep = ',';
- uschar ip[46];
- uschar *ptr = iplist;
-
- while (string_nextinlist(&ptr, &ipsep, ip, sizeof(ip)) != NULL)
+ for (da = cb->rhs; da != NULL; da = da->next)
{
+ int ipsep = ',';
+ uschar ip[46];
+ uschar *ptr = iplist;
+ uschar *res;
+
/* Handle exact matching */
+
if (!bitmask)
{
- for (da = cb->rhs; da != NULL; da = da->next)
+ while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
{
if (Ustrcmp(CS da->address, ip) == 0) break;
}
}
+
/* Handle bitmask matching */
+
else
{
int address[4];
ignore IPv6 addresses. The default mask is 0, which always matches.
We change this only for IPv4 addresses in the list. */
- if (host_aton(ip, address) == 1) mask = address[0];
+ if (host_aton(da->address, address) == 1) mask = address[0];
/* Scan the returned addresses, skipping any that are IPv6 */
- for (da = cb->rhs; da != NULL; da = da->next)
+ while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
{
- if (host_aton(da->address, address) != 1) continue;
- if ((address[0] & mask) == mask) break;
+ if (host_aton(ip, address) != 1) continue;
+ if ((address[0] & mask) == address[0]) break;
}
}
- /* Break out if a match has been found */
+ /* If either
+
+ (a) An IP address in an any ('=') list matched, or
+ (b) No IP address in an all ('==') list matched
- if (da != NULL) break;
+ then we're done searching. */
+
+ if (((match_type & MT_ALL) != 0) == (res == NULL)) break;
}
- /* If either
+ /* If da == NULL, either
- (a) No IP address in a positive list matched, or
- (b) An IP address in a negative list did match
+ (a) No IP address in an any ('=') list matched, or
+ (b) An IP address in an all ('==') list didn't match
- then behave as if the DNSBL lookup had not succeeded, i.e. the host is
- not on the list. */
+ so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on
+ the list. */
- if (invert_result != (da == NULL))
+ if ((match_type == MT_NOT || match_type == MT_ALL) != (da == NULL))
{
HDEBUG(D_dnsbl)
{
+ uschar *res = NULL;
+ switch(match_type)
+ {
+ case 0:
+ res = US"was no match";
+ break;
+ case MT_NOT:
+ res = US"was an exclude match";
+ break;
+ case MT_ALL:
+ res = US"was an IP address that did not match";
+ break;
+ case MT_NOT|MT_ALL:
+ res = US"were no IP addresses that did not match";
+ break;
+ }
debug_printf("=> but we are not accepting this block class because\n");
- debug_printf("=> there was %s match for %c%s\n",
- invert_result? "an exclude":"no", bitmask? '&' : '=', iplist);
+ debug_printf("=> there %s for %s%c%s\n",
+ res,
+ ((match_type & MT_ALL) == 0)? "" : "=",
+ bitmask? '&' : '=', iplist);
}
return FAIL;
}
if (domain_txt != domain)
return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL,
- FALSE, invert_result, defer_return);
+ 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. */
{
int sep = 0;
int defer_return = FAIL;
-BOOL invert_result = FALSE;
uschar *list = *listptr;
uschar *domain;
uschar *s;
{
int rc;
BOOL bitmask = FALSE;
+ int match_type = 0;
uschar *domain_txt;
uschar *comma;
uschar *iplist;
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
for (s = domain; *s != 0; s++)
{
- if (!isalnum(*s) && *s != '-' && *s != '.')
+ if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_')
{
log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
"strange characters - is this right?", domain);
if (domain_txt != domain) for (s = domain_txt; *s != 0; s++)
{
- if (!isalnum(*s) && *s != '-' && *s != '.')
+ if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_')
{
log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
"strange characters - is this right?", domain_txt);
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, invert_result, defer_return);
+ iplist, bitmask, match_type, defer_return);
if (rc == OK)
{
dnslist_domain = string_copy(domain_txt);
+ dnslist_matched = string_copy(sender_host_address);
HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
sender_host_address, dnslist_domain);
}
}
rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist,
- bitmask, invert_result, defer_return);
+ bitmask, match_type, defer_return);
if (rc == OK)
{
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;
projects / exim.git / blobdiff