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/* $OpenBSD: ruleset.c,v 1.33 2016/08/31 15:24:04 gilles Exp $ */
/*
* Copyright (c) 2009 Gilles Chehade <gilles@poolp.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <event.h>
#include <imsg.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include "smtpd.h"
#include "log.h"
static int ruleset_check_source(struct table *,
const struct sockaddr_storage *, int);
static int ruleset_check_mailaddr(struct table *, const struct mailaddr *);
struct rule *
ruleset_match(const struct envelope *evp)
{
const struct mailaddr *maddr = &evp->dest;
const struct sockaddr_storage *ss = &evp->ss;
struct rule *r;
int ret;
TAILQ_FOREACH(r, env->sc_rules, r_entry) {
if (r->r_tag[0] != '\0') {
ret = strcmp(r->r_tag, evp->tag);
if (ret != 0 && !r->r_nottag)
continue;
if (ret == 0 && r->r_nottag)
continue;
}
if (r->r_wantauth && !(evp->flags & EF_AUTHENTICATED))
continue;
ret = ruleset_check_source(r->r_sources, ss, evp->flags);
if (ret == -1) {
errno = EAGAIN;
return (NULL);
}
if ((ret == 0 && !r->r_notsources) || (ret != 0 && r->r_notsources))
continue;
if (r->r_senders) {
ret = ruleset_check_mailaddr(r->r_senders, &evp->sender);
if (ret == -1) {
errno = EAGAIN;
return (NULL);
}
if ((ret == 0 && !r->r_notsenders) || (ret != 0 && r->r_notsenders))
continue;
}
if (r->r_recipients) {
ret = ruleset_check_mailaddr(r->r_recipients, &evp->dest);
if (ret == -1) {
errno = EAGAIN;
return (NULL);
}
if ((ret == 0 && !r->r_notrecipients) || (ret != 0 && r->r_notrecipients))
continue;
}
ret = r->r_destination == NULL ? 1 :
table_lookup(r->r_destination, NULL, maddr->domain, K_DOMAIN,
NULL);
if (ret == -1) {
errno = EAGAIN;
return NULL;
}
if ((ret == 0 && !r->r_notdestination) || (ret != 0 && r->r_notdestination))
continue;
goto matched;
}
errno = 0;
log_trace(TRACE_RULES, "no rule matched");
return (NULL);
matched:
log_trace(TRACE_RULES, "rule matched: %s", rule_to_text(r));
return r;
}
static int
ruleset_check_source(struct table *table, const struct sockaddr_storage *ss,
int evpflags)
{
const char *key;
if (evpflags & (EF_AUTHENTICATED | EF_INTERNAL))
key = "local";
else
key = ss_to_text(ss);
switch (table_lookup(table, NULL, key, K_NETADDR, NULL)) {
case 1:
return 1;
case -1:
log_warnx("warn: failure to perform a table lookup on table %s",
table->t_name);
return -1;
default:
break;
}
return 0;
}
static int
ruleset_check_mailaddr(struct table *table, const struct mailaddr *maddr)
{
const char *key;
key = mailaddr_to_text(maddr);
if (key == NULL)
return -1;
switch (table_lookup(table, NULL, key, K_MAILADDR, NULL)) {
case 1:
return 1;
case -1:
log_warnx("warn: failure to perform a table lookup on table %s",
table->t_name);
return -1;
default:
break;
}
return 0;
}
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