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/* $OpenBSD: ruleset.c,v 1.36 2018/06/16 19:41:26 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_match_table_lookup(struct table *table, const char *key, enum table_service service)
{
switch (table_lookup(table, NULL, key, service, 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_match_tag(struct rule *r, const struct envelope *evp)
{
int ret;
struct table *table;
if (!r->flag_tag)
return 1;
table = table_find(env, r->table_tag, NULL);
if ((ret = ruleset_match_table_lookup(table, evp->tag, K_STRING)) < 0)
return ret;
return r->flag_tag < 0 ? !ret : ret;
}
static int
ruleset_match_from(struct rule *r, const struct envelope *evp)
{
int ret;
const char *key;
struct table *table;
if (!r->flag_from)
return 1;
if (r->flag_from_socket) {
/* XXX - socket needs to be distinguished from "local" */
return -1;
}
/* XXX - socket should also be considered local */
if (evp->flags & EF_INTERNAL)
key = "local";
else
key = ss_to_text(&evp->ss);
table = table_find(env, r->table_from, NULL);
if ((ret = ruleset_match_table_lookup(table, key, K_NETADDR)) < 0)
return -1;
return r->flag_from < 0 ? !ret : ret;
}
static int
ruleset_match_to(struct rule *r, const struct envelope *evp)
{
int ret;
struct table *table;
if (!r->flag_for)
return 1;
table = table_find(env, r->table_for, NULL);
if ((ret = ruleset_match_table_lookup(table, evp->dest.domain,
K_DOMAIN)) < 0)
return -1;
return r->flag_for < 0 ? !ret : ret;
}
static int
ruleset_match_smtp_helo(struct rule *r, const struct envelope *evp)
{
int ret;
struct table *table;
if (!r->flag_smtp_helo)
return 1;
table = table_find(env, r->table_smtp_helo, NULL);
if ((ret = ruleset_match_table_lookup(table, evp->helo, K_DOMAIN)) < 0)
return -1;
return r->flag_smtp_helo < 0 ? !ret : ret;
}
static int
ruleset_match_smtp_starttls(struct rule *r, const struct envelope *evp)
{
if (!r->flag_smtp_starttls)
return 1;
/* XXX - not until TLS flag is added to envelope */
return -1;
}
static int
ruleset_match_smtp_auth(struct rule *r, const struct envelope *evp)
{
int ret;
if (!r->flag_smtp_auth)
return 1;
if (!(evp->flags & EF_AUTHENTICATED))
ret = 0;
else if (r->table_smtp_auth) {
/* XXX - not until smtp_session->username is added to envelope */
/*
* table = table_find(m->from_table, NULL);
* key = evp->username;
* return ruleset_match_table_lookup(table, key, K_CREDENTIALS);
*/
return -1;
}
else
ret = 1;
return r->flag_smtp_auth < 0 ? !ret : ret;
}
static int
ruleset_match_smtp_mail_from(struct rule *r, const struct envelope *evp)
{
int ret;
const char *key;
struct table *table;
if (!r->flag_smtp_mail_from)
return 1;
if ((key = mailaddr_to_text(&evp->sender)) == NULL)
return -1;
table = table_find(env, r->table_smtp_mail_from, NULL);
if ((ret = ruleset_match_table_lookup(table, key, K_MAILADDR)) < 0)
return -1;
return r->flag_smtp_mail_from < 0 ? !ret : ret;
}
static int
ruleset_match_smtp_rcpt_to(struct rule *r, const struct envelope *evp)
{
int ret;
const char *key;
struct table *table;
if (!r->flag_smtp_rcpt_to)
return 1;
if ((key = mailaddr_to_text(&evp->dest)) == NULL)
return -1;
table = table_find(env, r->table_smtp_rcpt_to, NULL);
if ((ret = ruleset_match_table_lookup(table, key, K_MAILADDR)) < 0)
return -1;
return r->flag_smtp_rcpt_to < 0 ? !ret : ret;
}
struct rule *
ruleset_match(const struct envelope *evp)
{
struct rule *r;
int i = 0;
#define MATCH_EVAL(x) \
switch ((x)) { \
case -1: goto tempfail; \
case 0: continue; \
default: break; \
}
TAILQ_FOREACH(r, env->sc_rules, r_entry) {
++i;
MATCH_EVAL(ruleset_match_tag(r, evp));
MATCH_EVAL(ruleset_match_from(r, evp));
MATCH_EVAL(ruleset_match_to(r, evp));
MATCH_EVAL(ruleset_match_smtp_helo(r, evp));
MATCH_EVAL(ruleset_match_smtp_auth(r, evp));
MATCH_EVAL(ruleset_match_smtp_starttls(r, evp));
MATCH_EVAL(ruleset_match_smtp_mail_from(r, evp));
MATCH_EVAL(ruleset_match_smtp_rcpt_to(r, evp));
goto matched;
}
#undef MATCH_EVAL
errno = 0;
log_trace(TRACE_RULES, "no rule matched");
return (NULL);
tempfail:
errno = EAGAIN;
log_trace(TRACE_RULES, "temporary failure in processing of a rule");
return (NULL);
matched:
log_trace(TRACE_RULES, "rule #%d matched: %s", i, rule_to_text(r));
return r;
}
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