ASTERISK-23919 #close Reported by Malcolm Davenport Review: https://reviewboard.asterisk.org/r/3802 git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@419592 65c4cc65-6c06-0410-ace0-fbb531ad65f3
599 lines
16 KiB
C
599 lines
16 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2005, Mikael Magnusson
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*
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* Mikael Magnusson <mikma@users.sourceforge.net>
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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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* Builds on libSRTP http://srtp.sourceforge.net
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*/
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/*! \file res_srtp.c
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*
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* \brief Secure RTP (SRTP)
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*
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* Secure RTP (SRTP)
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* Specified in RFC 3711.
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*
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* \author Mikael Magnusson <mikma@users.sourceforge.net>
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*/
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/*** MODULEINFO
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<depend>srtp</depend>
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<support_level>core</support_level>
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***/
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/* See https://wiki.asterisk.org/wiki/display/AST/Secure+Calling */
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include <srtp/srtp.h>
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#include "asterisk/lock.h"
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#include "asterisk/sched.h"
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#include "asterisk/module.h"
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#include "asterisk/options.h"
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#include "asterisk/rtp_engine.h"
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#include "asterisk/astobj2.h"
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struct ast_srtp {
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struct ast_rtp_instance *rtp;
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struct ao2_container *policies;
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srtp_t session;
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const struct ast_srtp_cb *cb;
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void *data;
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int warned;
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unsigned char buf[8192 + AST_FRIENDLY_OFFSET];
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unsigned char rtcpbuf[8192 + AST_FRIENDLY_OFFSET];
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};
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struct ast_srtp_policy {
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srtp_policy_t sp;
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};
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/*! Tracks whether or not we've initialized the libsrtp library */
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static int g_initialized = 0;
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/* SRTP functions */
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static int ast_srtp_create(struct ast_srtp **srtp, struct ast_rtp_instance *rtp, struct ast_srtp_policy *policy);
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static int ast_srtp_replace(struct ast_srtp **srtp, struct ast_rtp_instance *rtp, struct ast_srtp_policy *policy);
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static void ast_srtp_destroy(struct ast_srtp *srtp);
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static int ast_srtp_add_stream(struct ast_srtp *srtp, struct ast_srtp_policy *policy);
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static int ast_srtp_change_source(struct ast_srtp *srtp, unsigned int from_ssrc, unsigned int to_ssrc);
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static int ast_srtp_unprotect(struct ast_srtp *srtp, void *buf, int *len, int rtcp);
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static int ast_srtp_protect(struct ast_srtp *srtp, void **buf, int *len, int rtcp);
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static void ast_srtp_set_cb(struct ast_srtp *srtp, const struct ast_srtp_cb *cb, void *data);
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static int ast_srtp_get_random(unsigned char *key, size_t len);
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/* Policy functions */
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static struct ast_srtp_policy *ast_srtp_policy_alloc(void);
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static void ast_srtp_policy_destroy(struct ast_srtp_policy *policy);
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static int ast_srtp_policy_set_suite(struct ast_srtp_policy *policy, enum ast_srtp_suite suite);
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static int ast_srtp_policy_set_master_key(struct ast_srtp_policy *policy, const unsigned char *key, size_t key_len, const unsigned char *salt, size_t salt_len);
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static void ast_srtp_policy_set_ssrc(struct ast_srtp_policy *policy, unsigned long ssrc, int inbound);
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static struct ast_srtp_res srtp_res = {
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.create = ast_srtp_create,
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.replace = ast_srtp_replace,
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.destroy = ast_srtp_destroy,
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.add_stream = ast_srtp_add_stream,
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.change_source = ast_srtp_change_source,
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.set_cb = ast_srtp_set_cb,
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.unprotect = ast_srtp_unprotect,
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.protect = ast_srtp_protect,
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.get_random = ast_srtp_get_random
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};
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static struct ast_srtp_policy_res policy_res = {
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.alloc = ast_srtp_policy_alloc,
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.destroy = ast_srtp_policy_destroy,
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.set_suite = ast_srtp_policy_set_suite,
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.set_master_key = ast_srtp_policy_set_master_key,
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.set_ssrc = ast_srtp_policy_set_ssrc
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};
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static const char *srtp_errstr(int err)
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{
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switch(err) {
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case err_status_ok:
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return "nothing to report";
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case err_status_fail:
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return "unspecified failure";
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case err_status_bad_param:
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return "unsupported parameter";
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case err_status_alloc_fail:
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return "couldn't allocate memory";
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case err_status_dealloc_fail:
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return "couldn't deallocate properly";
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case err_status_init_fail:
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return "couldn't initialize";
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case err_status_terminus:
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return "can't process as much data as requested";
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case err_status_auth_fail:
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return "authentication failure";
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case err_status_cipher_fail:
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return "cipher failure";
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case err_status_replay_fail:
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return "replay check failed (bad index)";
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case err_status_replay_old:
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return "replay check failed (index too old)";
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case err_status_algo_fail:
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return "algorithm failed test routine";
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case err_status_no_such_op:
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return "unsupported operation";
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case err_status_no_ctx:
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return "no appropriate context found";
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case err_status_cant_check:
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return "unable to perform desired validation";
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case err_status_key_expired:
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return "can't use key any more";
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default:
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return "unknown";
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}
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}
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static int policy_hash_fn(const void *obj, const int flags)
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{
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const struct ast_srtp_policy *policy = obj;
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return policy->sp.ssrc.type == ssrc_specific ? policy->sp.ssrc.value : policy->sp.ssrc.type;
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}
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static int policy_cmp_fn(void *obj, void *arg, int flags)
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{
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const struct ast_srtp_policy *one = obj, *two = arg;
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return one->sp.ssrc.type == two->sp.ssrc.type && one->sp.ssrc.value == two->sp.ssrc.value;
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}
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static struct ast_srtp_policy *find_policy(struct ast_srtp *srtp, const srtp_policy_t *policy, int flags)
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{
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struct ast_srtp_policy tmp = {
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.sp = {
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.ssrc.type = policy->ssrc.type,
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.ssrc.value = policy->ssrc.value,
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},
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};
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return ao2_t_find(srtp->policies, &tmp, flags, "Looking for policy");
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}
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static struct ast_srtp *res_srtp_new(void)
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{
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struct ast_srtp *srtp;
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if (!(srtp = ast_calloc(1, sizeof(*srtp)))) {
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ast_log(LOG_ERROR, "Unable to allocate memory for srtp\n");
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return NULL;
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}
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if (!(srtp->policies = ao2_t_container_alloc(5, policy_hash_fn, policy_cmp_fn, "SRTP policy container"))) {
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ast_free(srtp);
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return NULL;
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}
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srtp->warned = 1;
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return srtp;
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}
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/*
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struct ast_srtp_policy
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*/
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static void srtp_event_cb(srtp_event_data_t *data)
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{
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switch (data->event) {
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case event_ssrc_collision:
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ast_debug(1, "SSRC collision\n");
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break;
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case event_key_soft_limit:
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ast_debug(1, "event_key_soft_limit\n");
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break;
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case event_key_hard_limit:
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ast_debug(1, "event_key_hard_limit\n");
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break;
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case event_packet_index_limit:
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ast_debug(1, "event_packet_index_limit\n");
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break;
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}
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}
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static void ast_srtp_policy_set_ssrc(struct ast_srtp_policy *policy,
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unsigned long ssrc, int inbound)
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{
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if (ssrc) {
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policy->sp.ssrc.type = ssrc_specific;
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policy->sp.ssrc.value = ssrc;
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} else {
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policy->sp.ssrc.type = inbound ? ssrc_any_inbound : ssrc_any_outbound;
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}
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}
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static void policy_destructor(void *obj)
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{
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struct ast_srtp_policy *policy = obj;
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if (policy->sp.key) {
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ast_free(policy->sp.key);
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policy->sp.key = NULL;
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}
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}
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static struct ast_srtp_policy *ast_srtp_policy_alloc()
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{
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struct ast_srtp_policy *tmp;
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if (!(tmp = ao2_t_alloc(sizeof(*tmp), policy_destructor, "Allocating policy"))) {
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ast_log(LOG_ERROR, "Unable to allocate memory for srtp_policy\n");
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}
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return tmp;
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}
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static void ast_srtp_policy_destroy(struct ast_srtp_policy *policy)
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{
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ao2_t_ref(policy, -1, "Destroying policy");
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}
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static int policy_set_suite(crypto_policy_t *p, enum ast_srtp_suite suite)
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{
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switch (suite) {
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case AST_AES_CM_128_HMAC_SHA1_80:
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p->cipher_type = AES_128_ICM;
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p->cipher_key_len = 30;
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p->auth_type = HMAC_SHA1;
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p->auth_key_len = 20;
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p->auth_tag_len = 10;
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p->sec_serv = sec_serv_conf_and_auth;
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return 0;
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case AST_AES_CM_128_HMAC_SHA1_32:
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p->cipher_type = AES_128_ICM;
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p->cipher_key_len = 30;
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p->auth_type = HMAC_SHA1;
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p->auth_key_len = 20;
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p->auth_tag_len = 4;
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p->sec_serv = sec_serv_conf_and_auth;
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return 0;
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default:
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ast_log(LOG_ERROR, "Invalid crypto suite: %u\n", suite);
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return -1;
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}
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}
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static int ast_srtp_policy_set_suite(struct ast_srtp_policy *policy, enum ast_srtp_suite suite)
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{
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return policy_set_suite(&policy->sp.rtp, suite) | policy_set_suite(&policy->sp.rtcp, suite);
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}
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static int ast_srtp_policy_set_master_key(struct ast_srtp_policy *policy, const unsigned char *key, size_t key_len, const unsigned char *salt, size_t salt_len)
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{
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size_t size = key_len + salt_len;
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unsigned char *master_key;
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if (policy->sp.key) {
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ast_free(policy->sp.key);
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policy->sp.key = NULL;
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}
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if (!(master_key = ast_calloc(1, size))) {
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return -1;
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}
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memcpy(master_key, key, key_len);
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memcpy(master_key + key_len, salt, salt_len);
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policy->sp.key = master_key;
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return 0;
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}
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static int ast_srtp_get_random(unsigned char *key, size_t len)
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{
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return crypto_get_random(key, len) != err_status_ok ? -1: 0;
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}
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static void ast_srtp_set_cb(struct ast_srtp *srtp, const struct ast_srtp_cb *cb, void *data)
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{
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if (!srtp) {
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return;
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}
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srtp->cb = cb;
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srtp->data = data;
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}
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/* Vtable functions */
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static int ast_srtp_unprotect(struct ast_srtp *srtp, void *buf, int *len, int rtcp)
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{
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int res = 0;
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int i;
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int retry = 0;
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struct ast_rtp_instance_stats stats = {0,};
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tryagain:
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for (i = 0; i < 2; i++) {
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res = rtcp ? srtp_unprotect_rtcp(srtp->session, buf, len) : srtp_unprotect(srtp->session, buf, len);
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if (res != err_status_no_ctx) {
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break;
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}
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if (srtp->cb && srtp->cb->no_ctx) {
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if (ast_rtp_instance_get_stats(srtp->rtp, &stats, AST_RTP_INSTANCE_STAT_REMOTE_SSRC)) {
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break;
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}
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if (srtp->cb->no_ctx(srtp->rtp, stats.remote_ssrc, srtp->data) < 0) {
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break;
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}
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} else {
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break;
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}
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}
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if (retry == 0 && res == err_status_replay_old) {
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ast_log(AST_LOG_NOTICE, "SRTP unprotect failed with %s, retrying\n", srtp_errstr(res));
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if (srtp->session) {
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struct ast_srtp_policy *policy;
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struct ao2_iterator it;
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int policies_count;
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/* dealloc first */
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ast_debug(5, "SRTP destroy before re-create\n");
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srtp_dealloc(srtp->session);
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/* get the count */
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policies_count = ao2_container_count(srtp->policies);
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/* get the first to build up */
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it = ao2_iterator_init(srtp->policies, 0);
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policy = ao2_iterator_next(&it);
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ast_debug(5, "SRTP try to re-create\n");
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if (policy) {
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int res_srtp_create = srtp_create(&srtp->session, &policy->sp);
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if (res_srtp_create == err_status_ok) {
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ast_debug(5, "SRTP re-created with first policy\n");
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ao2_t_ref(policy, -1, "Unreffing first policy for re-creating srtp session");
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/* if we have more than one policy, add them */
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if (policies_count > 1) {
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ast_debug(5, "Add all the other %d policies\n",
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policies_count - 1);
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while ((policy = ao2_iterator_next(&it))) {
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srtp_add_stream(srtp->session, &policy->sp);
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ao2_t_ref(policy, -1, "Unreffing n-th policy for re-creating srtp session");
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}
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}
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retry++;
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ao2_iterator_destroy(&it);
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goto tryagain;
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}
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ast_log(LOG_ERROR, "SRTP session could not be re-created after unprotect failure: %s\n", srtp_errstr(res_srtp_create));
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/* If srtp_create() fails with a previously alloced session, it will have been dealloced before returning. */
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srtp->session = NULL;
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ao2_t_ref(policy, -1, "Unreffing first policy after srtp_create failed");
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}
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ao2_iterator_destroy(&it);
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}
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}
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if (!srtp->session) {
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errno = EINVAL;
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return -1;
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}
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if (res != err_status_ok && res != err_status_replay_fail ) {
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if ((srtp->warned >= 10) && !((srtp->warned - 10) % 100)) {
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ast_log(AST_LOG_WARNING, "SRTP unprotect failed with: %s %d\n", srtp_errstr(res), srtp->warned);
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srtp->warned = 11;
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} else {
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srtp->warned++;
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}
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errno = EAGAIN;
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return -1;
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}
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return *len;
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}
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static int ast_srtp_protect(struct ast_srtp *srtp, void **buf, int *len, int rtcp)
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{
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int res;
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unsigned char *localbuf;
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if ((*len + SRTP_MAX_TRAILER_LEN) > sizeof(srtp->buf)) {
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return -1;
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}
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localbuf = rtcp ? srtp->rtcpbuf : srtp->buf;
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memcpy(localbuf, *buf, *len);
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if ((res = rtcp ? srtp_protect_rtcp(srtp->session, localbuf, len) : srtp_protect(srtp->session, localbuf, len)) != err_status_ok && res != err_status_replay_fail) {
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ast_log(LOG_WARNING, "SRTP protect: %s\n", srtp_errstr(res));
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return -1;
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}
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*buf = localbuf;
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return *len;
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}
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static int ast_srtp_create(struct ast_srtp **srtp, struct ast_rtp_instance *rtp, struct ast_srtp_policy *policy)
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{
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struct ast_srtp *temp;
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if (!(temp = res_srtp_new())) {
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return -1;
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}
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ast_module_ref(ast_module_info->self);
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/* Any failures after this point can use ast_srtp_destroy to destroy the instance */
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if (srtp_create(&temp->session, &policy->sp) != err_status_ok) {
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/* Session either wasn't created or was created and dealloced. */
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temp->session = NULL;
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ast_srtp_destroy(temp);
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return -1;
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}
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temp->rtp = rtp;
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*srtp = temp;
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ao2_t_link((*srtp)->policies, policy, "Created initial policy");
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return 0;
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}
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static int ast_srtp_replace(struct ast_srtp **srtp, struct ast_rtp_instance *rtp, struct ast_srtp_policy *policy)
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{
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if ((*srtp) != NULL) {
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ast_srtp_destroy(*srtp);
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}
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return ast_srtp_create(srtp, rtp, policy);
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}
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static void ast_srtp_destroy(struct ast_srtp *srtp)
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{
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if (srtp->session) {
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srtp_dealloc(srtp->session);
|
|
}
|
|
|
|
ao2_t_callback(srtp->policies, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, NULL, NULL, "Unallocate policy");
|
|
ao2_t_ref(srtp->policies, -1, "Destroying container");
|
|
|
|
ast_free(srtp);
|
|
ast_module_unref(ast_module_info->self);
|
|
}
|
|
|
|
static int ast_srtp_add_stream(struct ast_srtp *srtp, struct ast_srtp_policy *policy)
|
|
{
|
|
struct ast_srtp_policy *match;
|
|
|
|
/* For existing streams, replace if its an SSRC stream, or bail if its a wildcard */
|
|
if ((match = find_policy(srtp, &policy->sp, OBJ_POINTER))) {
|
|
if (policy->sp.ssrc.type != ssrc_specific) {
|
|
ast_log(AST_LOG_WARNING, "Cannot replace an existing wildcard policy\n");
|
|
ao2_t_ref(match, -1, "Unreffing already existing policy");
|
|
return -1;
|
|
} else {
|
|
if (srtp_remove_stream(srtp->session, match->sp.ssrc.value) != err_status_ok) {
|
|
ast_log(AST_LOG_WARNING, "Failed to remove SRTP stream for SSRC %u\n", match->sp.ssrc.value);
|
|
}
|
|
ao2_t_unlink(srtp->policies, match, "Remove existing match policy");
|
|
ao2_t_ref(match, -1, "Unreffing already existing policy");
|
|
}
|
|
}
|
|
|
|
ast_debug(3, "Adding new policy for %s %u\n",
|
|
policy->sp.ssrc.type == ssrc_specific ? "SSRC" : "type",
|
|
policy->sp.ssrc.type == ssrc_specific ? policy->sp.ssrc.value : policy->sp.ssrc.type);
|
|
if (srtp_add_stream(srtp->session, &policy->sp) != err_status_ok) {
|
|
ast_log(AST_LOG_WARNING, "Failed to add SRTP stream for %s %u\n",
|
|
policy->sp.ssrc.type == ssrc_specific ? "SSRC" : "type",
|
|
policy->sp.ssrc.type == ssrc_specific ? policy->sp.ssrc.value : policy->sp.ssrc.type);
|
|
return -1;
|
|
}
|
|
|
|
ao2_t_link(srtp->policies, policy, "Added additional stream");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ast_srtp_change_source(struct ast_srtp *srtp, unsigned int from_ssrc, unsigned int to_ssrc)
|
|
{
|
|
struct ast_srtp_policy *match;
|
|
struct srtp_policy_t sp = {
|
|
.ssrc.type = ssrc_specific,
|
|
.ssrc.value = from_ssrc,
|
|
};
|
|
err_status_t status;
|
|
|
|
/* If we find a match, return and unlink it from the container so we
|
|
* can change the SSRC (which is part of the hash) and then have
|
|
* ast_srtp_add_stream link it back in if all is well */
|
|
if ((match = find_policy(srtp, &sp, OBJ_POINTER | OBJ_UNLINK))) {
|
|
match->sp.ssrc.value = to_ssrc;
|
|
if (ast_srtp_add_stream(srtp, match)) {
|
|
ast_log(LOG_WARNING, "Couldn't add stream\n");
|
|
} else if ((status = srtp_remove_stream(srtp->session, from_ssrc))) {
|
|
ast_debug(3, "Couldn't remove stream (%u)\n", status);
|
|
}
|
|
ao2_t_ref(match, -1, "Unreffing found policy in change_source");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void res_srtp_shutdown(void)
|
|
{
|
|
srtp_install_event_handler(NULL);
|
|
ast_rtp_engine_unregister_srtp();
|
|
#ifdef HAVE_SRTP_SHUTDOWN
|
|
srtp_shutdown();
|
|
#endif
|
|
g_initialized = 0;
|
|
}
|
|
|
|
static int res_srtp_init(void)
|
|
{
|
|
if (g_initialized) {
|
|
return 0;
|
|
}
|
|
|
|
if (srtp_init() != err_status_ok) {
|
|
ast_log(AST_LOG_WARNING, "Failed to initialize libsrtp\n");
|
|
return -1;
|
|
}
|
|
|
|
srtp_install_event_handler(srtp_event_cb);
|
|
|
|
if (ast_rtp_engine_register_srtp(&srtp_res, &policy_res)) {
|
|
ast_log(AST_LOG_WARNING, "Failed to register SRTP with rtp engine\n");
|
|
res_srtp_shutdown();
|
|
return -1;
|
|
}
|
|
|
|
g_initialized = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Exported functions
|
|
*/
|
|
|
|
static int load_module(void)
|
|
{
|
|
return res_srtp_init();
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
res_srtp_shutdown();
|
|
return 0;
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "Secure RTP (SRTP)",
|
|
.support_level = AST_MODULE_SUPPORT_CORE,
|
|
.load = load_module,
|
|
.unload = unload_module,
|
|
.load_pri = AST_MODPRI_CHANNEL_DEPEND,
|
|
);
|