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/* $OpenBSD: ruleset.c,v 1.11 2010/02/28 12:23:12 gilles Exp $ */
/*
* Copyright (c) 2009 Gilles Chehade <gilles@openbsd.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/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <db.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "smtpd.h"
struct rule *ruleset_match(struct smtpd *, char *tag, struct path *, struct sockaddr_storage *);
int ruleset_check_source(struct map *, struct sockaddr_storage *);
int ruleset_match_mask(struct sockaddr_storage *, struct netaddr *);
int ruleset_inet4_match(struct sockaddr_in *, struct netaddr *);
int ruleset_inet6_match(struct sockaddr_in6 *, struct netaddr *);
struct rule *
ruleset_match(struct smtpd *env, char *tag, struct path *path, struct sockaddr_storage *ss)
{
struct rule *r;
struct cond *cond;
struct map *map;
struct mapel *me;
TAILQ_FOREACH(r, env->sc_rules, r_entry) {
if (r->r_tag[0] != '\0' && strcmp(r->r_tag, tag) != 0)
continue;
if (ss != NULL &&
(!(path->flags & F_PATH_AUTHENTICATED) &&
! ruleset_check_source(r->r_sources, ss)))
continue;
TAILQ_FOREACH(cond, &r->r_conditions, c_entry) {
if (cond->c_type == C_ALL) {
path->cond = cond;
return r;
}
if (cond->c_type == C_DOM) {
map = map_find(env, cond->c_map);
if (map == NULL)
fatal("failed to lookup map.");
switch (map->m_src) {
case S_NONE:
TAILQ_FOREACH(me, &map->m_contents, me_entry) {
if (hostname_match(path->domain, me->me_key.med_string)) {
path->cond = cond;
return r;
}
}
break;
case S_DB:
if (map_lookup(env, map->m_id, path->domain) != NULL) {
path->cond = cond;
return r;
}
break;
default:
log_info("unsupported map source for domain map");
continue;
}
}
if (cond->c_type == C_VDOM) {
if (aliases_vdomain_exists(env, cond->c_map, path->domain)) {
path->cond = cond;
return r;
}
}
}
}
return NULL;
}
int
ruleset_check_source(struct map *map, struct sockaddr_storage *ss)
{
struct mapel *me;
if (ss == NULL) {
/* This happens when caller is part of an internal
* lookup (ie: alias resolved to a remote address)
*/
return 1;
}
TAILQ_FOREACH(me, &map->m_contents, me_entry) {
if (ss->ss_family != me->me_key.med_addr.ss.ss_family)
continue;
if (ss->ss_len != me->me_key.med_addr.ss.ss_len)
continue;
if (ruleset_match_mask(ss, &me->me_key.med_addr))
return 1;
}
return 0;
}
int
ruleset_match_mask(struct sockaddr_storage *ss, struct netaddr *ssmask)
{
if (ss->ss_family == AF_INET)
return ruleset_inet4_match((struct sockaddr_in *)ss, ssmask);
if (ss->ss_family == AF_INET6)
return ruleset_inet6_match((struct sockaddr_in6 *)ss, ssmask);
return (0);
}
int
ruleset_inet4_match(struct sockaddr_in *ss, struct netaddr *ssmask)
{
in_addr_t mask;
int i;
/* a.b.c.d/8 -> htonl(0xff000000) */
mask = 0;
for (i = 0; i < ssmask->bits; ++i)
mask = (mask >> 1) | 0x80000000;
mask = htonl(mask);
/* (addr & mask) == (net & mask) */
if ((ss->sin_addr.s_addr & mask) ==
(((struct sockaddr_in *)ssmask)->sin_addr.s_addr & mask))
return 1;
return 0;
}
int
ruleset_inet6_match(struct sockaddr_in6 *ss, struct netaddr *ssmask)
{
struct in6_addr *in;
struct in6_addr *inmask;
struct in6_addr mask;
int i;
bzero(&mask, sizeof(mask));
for (i = 0; i < ssmask->bits / 8; i++)
mask.s6_addr[i] = 0xff;
i = ssmask->bits % 8;
if (i)
mask.s6_addr[ssmask->bits / 8] = 0xff00 >> i;
in = &ss->sin6_addr;
inmask = &((struct sockaddr_in6 *)&ssmask->ss)->sin6_addr;
for (i = 0; i < 16; i++) {
if ((in->s6_addr[i] & mask.s6_addr[i]) !=
(inmask->s6_addr[i] & mask.s6_addr[i]))
return (0);
}
return (1);
}
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