AST-2010-003 git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@248946 65c4cc65-6c06-0410-ace0-fbb531ad65f3
542 lines
13 KiB
C
542 lines
13 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2006, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Various sorts of access control
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*
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* \author Mark Spencer <markster@digium.com>
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/network.h"
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#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__Darwin__)
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#include <fcntl.h>
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#include <net/route.h>
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#endif
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#if defined(SOLARIS)
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#include <sys/sockio.h>
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#include <net/if.h>
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#elif defined(HAVE_GETIFADDRS)
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#include <ifaddrs.h>
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#endif
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#include "asterisk/acl.h"
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#include "asterisk/channel.h"
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#include "asterisk/utils.h"
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#include "asterisk/lock.h"
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#include "asterisk/srv.h"
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#if (!defined(SOLARIS) && !defined(HAVE_GETIFADDRS))
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static int get_local_address(struct in_addr *ourip)
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{
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return -1;
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}
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#else
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static void score_address(const struct sockaddr_in *sin, struct in_addr *best_addr, int *best_score)
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{
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const char *address;
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int score;
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address = ast_inet_ntoa(sin->sin_addr);
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/* RFC 1700 alias for the local network */
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if (address[0] == '0') {
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score = -25;
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/* RFC 1700 localnet */
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} else if (strncmp(address, "127", 3) == 0) {
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score = -20;
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/* RFC 1918 non-public address space */
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} else if (strncmp(address, "10.", 3) == 0) {
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score = -5;
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/* RFC 1918 non-public address space */
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} else if (strncmp(address, "172", 3) == 0) {
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/* 172.16.0.0 - 172.19.255.255, but not 172.160.0.0 - 172.169.255.255 */
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if (address[4] == '1' && address[5] >= '6' && address[6] == '.') {
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score = -5;
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/* 172.20.0.0 - 172.29.255.255, but not 172.200.0.0 - 172.255.255.255 nor 172.2.0.0 - 172.2.255.255 */
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} else if (address[4] == '2' && address[6] == '.') {
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score = -5;
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/* 172.30.0.0 - 172.31.255.255 */
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} else if (address[4] == '3' && address[5] <= '1') {
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score = -5;
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/* All other 172 addresses are public */
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} else {
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score = 0;
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}
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/* RFC 2544 Benchmark test range (198.18.0.0 - 198.19.255.255, but not 198.180.0.0 - 198.199.255.255) */
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} else if (strncmp(address, "198.1", 5) == 0 && address[5] >= '8' && address[6] == '.') {
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score = -10;
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/* RFC 1918 non-public address space */
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} else if (strncmp(address, "192.168", 7) == 0) {
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score = -5;
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/* RFC 3330 Zeroconf network */
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} else if (strncmp(address, "169.254", 7) == 0) {
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/*!\note Better score than a test network, but not quite as good as RFC 1918
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* address space. The reason is that some Linux distributions automatically
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* configure a Zeroconf address before trying DHCP, so we want to prefer a
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* DHCP lease to a Zeroconf address.
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*/
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score = -10;
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/* RFC 3330 Test network */
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} else if (strncmp(address, "192.0.2.", 8) == 0) {
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score = -15;
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/* Every other address should be publically routable */
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} else {
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score = 0;
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}
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if (score > *best_score) {
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*best_score = score;
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memcpy(best_addr, &sin->sin_addr, sizeof(*best_addr));
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}
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}
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static int get_local_address(struct in_addr *ourip)
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{
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int s, res = -1;
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#ifdef SOLARIS
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struct lifreq *ifr = NULL;
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struct lifnum ifn;
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struct lifconf ifc;
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struct sockaddr_in *sa;
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char *buf = NULL;
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int bufsz, x;
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#endif /* SOLARIS */
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#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__)
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struct ifaddrs *ifap, *ifaphead;
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int rtnerr;
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const struct sockaddr_in *sin;
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#endif /* BSD_OR_LINUX */
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struct in_addr best_addr;
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int best_score = -100;
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memset(&best_addr, 0, sizeof(best_addr));
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#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__)
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rtnerr = getifaddrs(&ifaphead);
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if (rtnerr) {
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perror(NULL);
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return -1;
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}
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#endif /* BSD_OR_LINUX */
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s = socket(AF_INET, SOCK_STREAM, 0);
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if (s > 0) {
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#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__)
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for (ifap = ifaphead; ifap; ifap = ifap->ifa_next) {
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if (ifap->ifa_addr && ifap->ifa_addr->sa_family == AF_INET) {
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sin = (const struct sockaddr_in *) ifap->ifa_addr;
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score_address(sin, &best_addr, &best_score);
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res = 0;
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if (best_score == 0) {
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break;
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}
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}
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}
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#endif /* BSD_OR_LINUX */
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/* There is no reason whatsoever that this shouldn't work on Linux or BSD also. */
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#ifdef SOLARIS
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/* Get a count of interfaces on the machine */
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ifn.lifn_family = AF_INET;
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ifn.lifn_flags = 0;
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ifn.lifn_count = 0;
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if (ioctl(s, SIOCGLIFNUM, &ifn) < 0) {
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close(s);
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return -1;
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}
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bufsz = ifn.lifn_count * sizeof(struct lifreq);
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if (!(buf = malloc(bufsz))) {
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close(s);
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return -1;
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}
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memset(buf, 0, bufsz);
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/* Get a list of interfaces on the machine */
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ifc.lifc_len = bufsz;
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ifc.lifc_buf = buf;
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ifc.lifc_family = AF_INET;
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ifc.lifc_flags = 0;
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if (ioctl(s, SIOCGLIFCONF, &ifc) < 0) {
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close(s);
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free(buf);
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return -1;
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}
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for (ifr = ifc.lifc_req, x = 0; x < ifn.lifn_count; ifr++, x++) {
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sa = (struct sockaddr_in *)&(ifr->lifr_addr);
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score_address(sa, &best_addr, &best_score);
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res = 0;
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if (best_score == 0) {
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break;
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}
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}
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free(buf);
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#endif /* SOLARIS */
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close(s);
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}
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#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__)
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freeifaddrs(ifaphead);
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#endif /* BSD_OR_LINUX */
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if (res == 0 && ourip) {
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memcpy(ourip, &best_addr, sizeof(*ourip));
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}
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return res;
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}
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#endif /* HAVE_GETIFADDRS */
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/* Free HA structure */
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void ast_free_ha(struct ast_ha *ha)
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{
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struct ast_ha *hal;
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while (ha) {
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hal = ha;
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ha = ha->next;
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ast_free(hal);
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}
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}
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/* Copy HA structure */
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void ast_copy_ha(const struct ast_ha *from, struct ast_ha *to)
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{
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memcpy(&to->netaddr, &from->netaddr, sizeof(from->netaddr));
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memcpy(&to->netmask, &from->netmask, sizeof(from->netmask));
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to->sense = from->sense;
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}
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/* Create duplicate of ha structure */
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static struct ast_ha *ast_duplicate_ha(struct ast_ha *original)
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{
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struct ast_ha *new_ha;
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if ((new_ha = ast_calloc(1, sizeof(*new_ha)))) {
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/* Copy from original to new object */
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ast_copy_ha(original, new_ha);
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}
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return new_ha;
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}
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/* Create duplicate HA link list */
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/* Used in chan_sip2 templates */
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struct ast_ha *ast_duplicate_ha_list(struct ast_ha *original)
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{
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struct ast_ha *start = original;
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struct ast_ha *ret = NULL;
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struct ast_ha *current, *prev = NULL;
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while (start) {
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current = ast_duplicate_ha(start); /* Create copy of this object */
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if (prev) {
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prev->next = current; /* Link previous to this object */
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}
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if (!ret) {
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ret = current; /* Save starting point */
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}
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start = start->next; /* Go to next object */
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prev = current; /* Save pointer to this object */
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}
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return ret; /* Return start of list */
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}
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struct ast_ha *ast_append_ha(const char *sense, const char *stuff, struct ast_ha *path, int *error)
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{
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struct ast_ha *ha;
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char *nm;
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struct ast_ha *prev = NULL;
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struct ast_ha *ret;
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int x;
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char *tmp = ast_strdupa(stuff);
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ret = path;
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while (path) {
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prev = path;
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path = path->next;
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}
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if (!(ha = ast_calloc(1, sizeof(*ha)))) {
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return ret;
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}
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if (!(nm = strchr(tmp, '/'))) {
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/* assume /32. Yes, htonl does not do anything for this particular mask
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but we better use it to show we remember about byte order */
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ha->netmask.s_addr = htonl(0xFFFFFFFF);
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} else {
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*nm = '\0';
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nm++;
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if (!strchr(nm, '.')) {
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if ((sscanf(nm, "%30d", &x) == 1) && (x >= 0) && (x <= 32)) {
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if (x == 0) {
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/* This is special-cased to prevent unpredictable
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* behavior of shifting left 32 bits
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*/
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ha->netmask.s_addr = 0;
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} else {
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ha->netmask.s_addr = htonl(0xFFFFFFFF << (32 - x));
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}
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} else {
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ast_log(LOG_WARNING, "Invalid CIDR in %s\n", stuff);
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ast_free(ha);
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if (error) {
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*error = 1;
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}
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return ret;
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}
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} else if (!inet_aton(nm, &ha->netmask)) {
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ast_log(LOG_WARNING, "Invalid mask in %s\n", stuff);
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ast_free(ha);
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if (error) {
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*error = 1;
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}
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return ret;
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}
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}
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if (!inet_aton(tmp, &ha->netaddr)) {
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ast_log(LOG_WARNING, "Invalid IP address in %s\n", stuff);
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ast_free(ha);
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if (error) {
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*error = 1;
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}
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return ret;
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}
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ha->netaddr.s_addr &= ha->netmask.s_addr;
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ha->sense = strncasecmp(sense, "p", 1) ? AST_SENSE_DENY : AST_SENSE_ALLOW;
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ha->next = NULL;
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if (prev) {
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prev->next = ha;
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} else {
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ret = ha;
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}
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ast_debug(1, "%s/%s sense %d appended to acl for peer\n", ast_strdupa(ast_inet_ntoa(ha->netaddr)), ast_strdupa(ast_inet_ntoa(ha->netmask)), ha->sense);
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return ret;
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}
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int ast_apply_ha(struct ast_ha *ha, struct sockaddr_in *sin)
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{
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/* Start optimistic */
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int res = AST_SENSE_ALLOW;
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while (ha) {
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#if 0 /* debugging code */
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char iabuf[INET_ADDRSTRLEN];
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char iabuf2[INET_ADDRSTRLEN];
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/* DEBUG */
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ast_copy_string(iabuf, ast_inet_ntoa(sin->sin_addr), sizeof(iabuf));
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ast_copy_string(iabuf2, ast_inet_ntoa(ha->netaddr), sizeof(iabuf2));
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ast_debug(1, "##### Testing %s with %s\n", iabuf, iabuf2);
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#endif
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/* For each rule, if this address and the netmask = the net address
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apply the current rule */
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if ((sin->sin_addr.s_addr & ha->netmask.s_addr) == ha->netaddr.s_addr) {
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res = ha->sense;
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}
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ha = ha->next;
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}
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return res;
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}
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int ast_get_ip_or_srv(struct sockaddr_in *sin, const char *value, const char *service)
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{
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struct hostent *hp;
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struct ast_hostent ahp;
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char srv[256];
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char host[256];
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int tportno = ntohs(sin->sin_port);
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if (service) {
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snprintf(srv, sizeof(srv), "%s.%s", service, value);
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if (ast_get_srv(NULL, host, sizeof(host), &tportno, srv) > 0) {
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sin->sin_port = htons(tportno);
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value = host;
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}
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}
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if ((hp = ast_gethostbyname(value, &ahp))) {
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memcpy(&sin->sin_addr, hp->h_addr, sizeof(sin->sin_addr));
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} else {
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ast_log(LOG_WARNING, "Unable to lookup '%s'\n", value);
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return -1;
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}
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return 0;
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}
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struct dscp_codepoint {
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char *name;
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unsigned int space;
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};
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/* IANA registered DSCP codepoints */
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static const struct dscp_codepoint dscp_pool1[] = {
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{ "CS0", 0x00 },
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{ "CS1", 0x08 },
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{ "CS2", 0x10 },
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{ "CS3", 0x18 },
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{ "CS4", 0x20 },
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{ "CS5", 0x28 },
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{ "CS6", 0x30 },
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{ "CS7", 0x38 },
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{ "AF11", 0x0A },
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{ "AF12", 0x0C },
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{ "AF13", 0x0E },
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{ "AF21", 0x12 },
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{ "AF22", 0x14 },
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{ "AF23", 0x16 },
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{ "AF31", 0x1A },
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{ "AF32", 0x1C },
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{ "AF33", 0x1E },
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{ "AF41", 0x22 },
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{ "AF42", 0x24 },
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{ "AF43", 0x26 },
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{ "EF", 0x2E },
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};
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int ast_str2cos(const char *value, unsigned int *cos)
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{
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int fval;
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if (sscanf(value, "%30d", &fval) == 1) {
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if (fval < 8) {
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*cos = fval;
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return 0;
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}
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}
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return -1;
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}
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int ast_str2tos(const char *value, unsigned int *tos)
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{
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int fval;
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unsigned int x;
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if (sscanf(value, "%30i", &fval) == 1) {
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*tos = fval & 0xFF;
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return 0;
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}
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for (x = 0; x < ARRAY_LEN(dscp_pool1); x++) {
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if (!strcasecmp(value, dscp_pool1[x].name)) {
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*tos = dscp_pool1[x].space << 2;
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return 0;
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}
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}
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return -1;
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}
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const char *ast_tos2str(unsigned int tos)
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{
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unsigned int x;
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for (x = 0; x < ARRAY_LEN(dscp_pool1); x++) {
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if (dscp_pool1[x].space == (tos >> 2)) {
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return dscp_pool1[x].name;
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}
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}
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return "unknown";
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}
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int ast_get_ip(struct sockaddr_in *sin, const char *value)
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{
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return ast_get_ip_or_srv(sin, value, NULL);
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}
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int ast_ouraddrfor(struct in_addr *them, struct in_addr *us)
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{
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int s;
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struct sockaddr_in sin;
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socklen_t slen;
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if ((s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
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ast_log(LOG_ERROR, "Cannot create socket\n");
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return -1;
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}
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sin.sin_family = AF_INET;
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sin.sin_port = htons(5060);
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sin.sin_addr = *them;
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if (connect(s, (struct sockaddr *)&sin, sizeof(sin))) {
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ast_log(LOG_WARNING, "Cannot connect\n");
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close(s);
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return -1;
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}
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slen = sizeof(sin);
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if (getsockname(s, (struct sockaddr *)&sin, &slen)) {
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ast_log(LOG_WARNING, "Cannot get socket name\n");
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close(s);
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return -1;
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}
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close(s);
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ast_debug(3, "Found IP address for this socket\n");
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*us = sin.sin_addr;
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return 0;
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}
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int ast_find_ourip(struct in_addr *ourip, struct sockaddr_in bindaddr)
|
|
{
|
|
char ourhost[MAXHOSTNAMELEN] = "";
|
|
struct ast_hostent ahp;
|
|
struct hostent *hp;
|
|
struct in_addr saddr;
|
|
|
|
/* just use the bind address if it is nonzero */
|
|
if (ntohl(bindaddr.sin_addr.s_addr)) {
|
|
memcpy(ourip, &bindaddr.sin_addr, sizeof(*ourip));
|
|
ast_debug(3, "Attached to given IP address\n");
|
|
return 0;
|
|
}
|
|
/* try to use our hostname */
|
|
if (gethostname(ourhost, sizeof(ourhost) - 1)) {
|
|
ast_log(LOG_WARNING, "Unable to get hostname\n");
|
|
} else {
|
|
if ((hp = ast_gethostbyname(ourhost, &ahp))) {
|
|
memcpy(ourip, hp->h_addr, sizeof(*ourip));
|
|
ast_debug(3, "Found one IP address based on local hostname %s.\n", ourhost);
|
|
return 0;
|
|
}
|
|
}
|
|
ast_debug(3, "Trying to check A.ROOT-SERVERS.NET and get our IP address for that connection\n");
|
|
/* A.ROOT-SERVERS.NET. */
|
|
if (inet_aton("198.41.0.4", &saddr) && !ast_ouraddrfor(&saddr, ourip)) {
|
|
return 0;
|
|
}
|
|
return get_local_address(ourip);
|
|
}
|
|
|