*************************************************/
/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions for finding hosts, either by gethostbyname(), gethostbyaddr(), or
time_msec = get_time_in_ms();
retval = dns_lookup(dnsa, name, type, fully_qualified_name);
if ((time_msec = get_time_in_ms() - time_msec) > slow_lookup_log)
- log_long_lookup(US"name", name, time_msec);
+ log_long_lookup(dns_text_type(type), name, time_msec);
return retval;
}
DEBUG(D_host_lookup)
debug_printf("using host_fake_gethostbyname for %s (%s)\n", name,
- (af == AF_INET)? "IPv4" : "IPv6");
+ af == AF_INET ? "IPv4" : "IPv6");
/* Handle unqualified "localhost" */
if (Ustrcmp(name, "localhost") == 0)
- lname = (af == AF_INET)? US"127.0.0.1" : US"::1";
+ lname = af == AF_INET ? US"127.0.0.1" : US"::1";
/* Handle a literal IP address */
if ((ipa = string_is_ip_address(lname, NULL)) != 0)
- {
- if ((ipa == 4 && af == AF_INET) ||
- (ipa == 6 && af == AF_INET6))
+ if ( ipa == 4 && af == AF_INET
+ || ipa == 6 && af == AF_INET6)
{
int x[4];
yield = store_get(sizeof(struct hostent), FALSE);
*error_num = HOST_NOT_FOUND;
return NULL;
}
- }
/* Handle a host name */
else
{
- int type = (af == AF_INET)? T_A:T_AAAA;
+ int type = af == AF_INET ? T_A:T_AAAA;
int rc = dns_lookup_timerwrap(dnsa, lname, type, NULL);
int count = 0;
int sep = 0;
uschar *s;
ip_address_item * yield = NULL, * last = NULL, * next;
+BOOL taint = is_tainted(list);
while ((s = string_nextinlist(&list, &sep, NULL, 0)))
{
address above. The field in the ip_address_item is large enough to hold an
IPv6 address. */
- next = store_get(sizeof(ip_address_item), FALSE);
+ next = store_get(sizeof(ip_address_item), taint);
next->next = NULL;
Ustrcpy(next->address, s);
next->port = port;
if ( slow_lookup_log
&& (time_msec = get_time_in_ms() - time_msec) > slow_lookup_log
)
- log_long_lookup(US"name", sender_host_address, time_msec);
+ log_long_lookup(US"gethostbyaddr", sender_host_address, time_msec);
/* Failed to look up the host. */
int sep = 0;
uschar *save_hostname;
uschar **aliases;
-uschar buffer[256];
uschar *ordername;
const uschar *list = host_lookup_order;
dns_answer * dnsa = store_get_dns_answer();
/* Do lookups directly in the DNS or via gethostbyaddr() (or equivalent), in
the order specified by the host_lookup_order option. */
-while ((ordername = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
+while ((ordername = string_nextinlist(&list, &sep, NULL, 0)))
{
if (strcmpic(ordername, US"bydns") == 0)
{
+ uschar * name = dns_build_reverse(sender_host_address);
+
dns_init(FALSE, FALSE, FALSE); /* dnssec ctrl by dns_dnssec_ok glbl */
- dns_build_reverse(sender_host_address, buffer);
- rc = dns_lookup_timerwrap(dnsa, buffer, T_PTR, NULL);
+ rc = dns_lookup_timerwrap(dnsa, name, T_PTR, NULL);
/* The first record we come across is used for the name; others are
considered to be aliases. We have to scan twice, in order to find out the
int af;
#endif
+#ifndef DISABLE_TLS
+/* Copy the host name at this point to the value which is used for
+TLS certificate name checking, before anything modifies it. */
+
+host->certname = host->name;
+#endif
+
/* Make sure DNS options are set as required. This appears to be necessary in
some circumstances when the get..byname() function actually calls the DNS. */
if ( slow_lookup_log
&& (time_msec = get_time_in_ms() - time_msec) > slow_lookup_log)
- log_long_lookup(US"name", host->name, time_msec);
+ log_long_lookup(US"gethostbyname", host->name, time_msec);
- if (hostdata == NULL)
+ if (!hostdata)
{
uschar *error;
switch (error_num)
case TRY_AGAIN: error = US"TRY_AGAIN"; break;
case NO_RECOVERY: error = US"NO_RECOVERY"; break;
case NO_DATA: error = US"NO_DATA"; break;
- #if NO_DATA != NO_ADDRESS
+ #if NO_DATA != NO_ADDRESS
case NO_ADDRESS: error = US"NO_ADDRESS"; break;
- #endif
+ #endif
default: error = US"?"; break;
}
DEBUG(D_host_lookup) debug_printf("%s returned %d (%s)\n",
+ f.running_in_test_harness ? "host_fake_gethostbyname" :
#if HAVE_IPV6
#if HAVE_GETIPNODEBYNAME
- (af == AF_INET6)? "getipnodebyname(af=inet6)" : "getipnodebyname(af=inet)",
+ af == AF_INET6 ? "getipnodebyname(af=inet6)" : "getipnodebyname(af=inet)",
#else
- (af == AF_INET6)? "gethostbyname2(af=inet6)" : "gethostbyname2(af=inet)",
+ af == AF_INET6 ? "gethostbyname2(af=inet6)" : "gethostbyname2(af=inet)",
#endif
#else
"gethostbyname",
{
host_item *next = store_get(sizeof(host_item), FALSE);
next->name = host->name;
+#ifndef DISABLE_TLS
+ next->certname = host->certname;
+#endif
next->mx = host->mx;
next->address = text_address;
next->port = PORT_NONE;
NULL. If temp_error is set, at least one of the lookups gave a temporary error,
so we pass that back. */
-if (host->address == NULL)
+if (!host->address)
{
uschar *msg =
#ifndef STAND_ALONE
- (message_id[0] == 0 && smtp_in != NULL)?
- string_sprintf("no IP address found for host %s (during %s)", host->name,
+ message_id[0] == 0 && smtp_in
+ ? string_sprintf("no IP address found for host %s (during %s)", host->name,
smtp_get_connection_info()) :
#endif
string_sprintf("no IP address found for host %s", host->name);
BOOL dnssec_fail = FALSE;
int i;
+#ifndef DISABLE_TLS
+/* Copy the host name at this point to the value which is used for
+TLS certificate name checking, before any CNAME-following modifies it. */
+
+host->certname = host->name;
+#endif
+
/* If allow_ip is set, a name which is an IP address returns that value
as its address. This is used for MX records when allow_mx_to_ip is set, for
those sites that feel they have to flaunt the RFC rules. */
return yield;
}
+
+
+
+#ifdef SUPPORT_DANE
+/* Lookup TLSA record for host/port.
+Return: OK success with dnssec; DANE mode
+ DEFER Do not use this host now, may retry later
+ FAIL_FORCED No TLSA record; DANE not usable
+ FAIL Do not use this connection
+*/
+
+int
+tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
+{
+uschar buffer[300];
+const uschar * fullname = buffer;
+int rc;
+BOOL sec;
+
+/* TLSA lookup string */
+(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
+
+rc = dns_lookup_timerwrap(dnsa, buffer, T_TLSA, &fullname);
+sec = dns_is_secure(dnsa);
+DEBUG(D_transport)
+ debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
+
+switch (rc)
+ {
+ case DNS_AGAIN:
+ return DEFER; /* just defer this TLS'd conn */
+
+ case DNS_SUCCEED:
+ if (sec)
+ {
+ DEBUG(D_transport)
+ {
+ dns_scan dnss;
+ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
+ if (rr->type == T_TLSA && rr->size > 3)
+ {
+ uint16_t payload_length = rr->size - 3;
+ uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
+
+ sp += sprintf(CS sp, "%d ", *p++); /* usage */
+ sp += sprintf(CS sp, "%d ", *p++); /* selector */
+ sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
+ while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
+ sp += sprintf(CS sp, "%02x", *p++);
+
+ debug_printf(" %s\n", s);
+ }
+ }
+ return OK;
+ }
+ log_write(0, LOG_MAIN,
+ "DANE error: TLSA lookup for %s not DNSSEC", host->name);
+ /*FALLTRHOUGH*/
+
+ case DNS_NODATA: /* no TLSA RR for this lookup */
+ case DNS_NOMATCH: /* no records at all for this lookup */
+ return dane_required ? FAIL : FAIL_FORCED;
+
+ default:
+ case DNS_FAIL:
+ return dane_required ? FAIL : DEFER;
+ }
+}
+#endif /*SUPPORT_DANE*/
+
+
+
/*************************************************
**************************************************
* Stand-alone test program *
git://git.exim.org / exim.git / blobdiff