2022-07-26 12:01:04 +00:00
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/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2022, Commend International
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*
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* Maximilian Fridrich <m.fridrich@commend.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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/*** MODULEINFO
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<depend>pjproject</depend>
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<depend>res_pjsip</depend>
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<depend>res_pjsip_session</depend>
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include <pjsip.h>
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#include <pjsip_ua.h>
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#include "asterisk/res_pjsip.h"
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#include "asterisk/res_pjsip_session.h"
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#include "asterisk/module.h"
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#include "asterisk/causes.h"
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#include "asterisk/threadpool.h"
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2023-05-02 08:55:39 +00:00
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/*! \brief Private data structure used with the modules's datastore */
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struct rfc3329_store_data {
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int last_rx_status_code;
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};
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static void datastore_destroy_cb(void *data)
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{
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struct rfc3329_store_data *d = data;
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if (d) {
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ast_free(d);
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}
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}
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/*! \brief The channel datastore the module uses to store state */
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static const struct ast_datastore_info rfc3329_store_datastore = {
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.type = "rfc3329_store",
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.destroy = datastore_destroy_cb
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};
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2022-07-26 12:01:04 +00:00
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static void rfc3329_incoming_response(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
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{
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2023-05-02 08:55:39 +00:00
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RAII_VAR(struct ast_datastore *, datastore, ast_sip_session_get_datastore(session, "rfc3329_store"), ao2_cleanup);
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2022-07-26 12:01:04 +00:00
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static const pj_str_t str_security_server = { "Security-Server", 15 };
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struct ast_sip_contact_status *contact_status = NULL;
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struct ast_sip_security_mechanism *mech;
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2023-05-02 08:55:39 +00:00
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struct rfc3329_store_data *store_data;
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2022-07-26 12:01:04 +00:00
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pjsip_generic_string_hdr *header;
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char buf[128];
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char *hdr_val;
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char *mechanism;
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if (!session || !session->endpoint || !session->endpoint->security_negotiation
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2023-05-02 08:55:39 +00:00
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|| !session->contact || !(contact_status = ast_sip_get_contact_status(session->contact))
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|| !session->inv_session->dlg) {
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2022-07-26 12:01:04 +00:00
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return;
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}
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ao2_lock(contact_status);
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if (AST_VECTOR_SIZE(&contact_status->security_mechanisms)) {
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goto out;
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}
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2023-05-02 08:55:39 +00:00
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if (!datastore
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&& (datastore = ast_sip_session_alloc_datastore(&rfc3329_store_datastore, "rfc3329_store"))
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&& (store_data = ast_calloc(1, sizeof(struct rfc3329_store_data)))) {
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store_data->last_rx_status_code = rdata->msg_info.msg->line.status.code;
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datastore->data = store_data;
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ast_sip_session_add_datastore(session, datastore);
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} else {
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ast_log(AST_LOG_WARNING, "Could not store session data. Still attempting requests, but they might be missing necessary headers.\n");
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}
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2022-07-26 12:01:04 +00:00
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header = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &str_security_server, NULL);
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for (; header;
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header = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &str_security_server, header->next)) {
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/* Parse Security-Server headers and add to contact status to use for future requests. */
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ast_copy_pj_str(buf, &header->hvalue, sizeof(buf));
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hdr_val = ast_skip_blanks(buf);
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while ((mechanism = ast_strsep(&hdr_val, ',', AST_STRSEP_ALL))) {
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if (!ast_sip_str_to_security_mechanism(&mech, mechanism)) {
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AST_VECTOR_APPEND(&contact_status->security_mechanisms, mech);
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}
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}
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}
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out:
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ao2_unlock(contact_status);
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ao2_cleanup(contact_status);
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}
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2023-05-02 08:55:39 +00:00
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static void add_outgoing_request_headers(struct ast_sip_endpoint *endpoint, struct ast_sip_contact *contact, struct pjsip_tx_data *tdata,
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struct ast_datastore *datastore)
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2022-07-26 12:01:04 +00:00
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{
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static const pj_str_t security_verify = { "Security-Verify", 15 };
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struct pjsip_generic_string_hdr *hdr = NULL;
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struct ast_sip_contact_status *contact_status = NULL;
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2023-05-02 08:55:39 +00:00
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struct rfc3329_store_data *store_data;
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2022-07-26 12:01:04 +00:00
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if (endpoint->security_negotiation != AST_SIP_SECURITY_NEG_MEDIASEC) {
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return;
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}
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contact_status = ast_sip_get_contact_status(contact);
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hdr = pjsip_msg_find_hdr_by_name(tdata->msg, &security_verify, NULL);
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if (contact_status == NULL) {
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return;
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}
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ao2_lock(contact_status);
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if (AST_VECTOR_SIZE(&contact_status->security_mechanisms) && hdr == NULL) {
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/* Add Security-Verify headers (with q-value) */
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ast_sip_add_security_headers(&contact_status->security_mechanisms, "Security-Verify", 0, tdata);
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2023-05-02 08:55:39 +00:00
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}
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if (datastore) {
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store_data = datastore->data;
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if (store_data->last_rx_status_code == 401) {
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/* Add Security-Client headers (no q-value) */
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ast_sip_add_security_headers(&endpoint->security_mechanisms, "Security-Client", 0, tdata);
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}
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2022-07-26 12:01:04 +00:00
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}
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ao2_unlock(contact_status);
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ao2_cleanup(contact_status);
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}
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static void rfc3329_outgoing_request(struct ast_sip_session *session, struct pjsip_tx_data *tdata)
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{
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2023-05-02 08:55:39 +00:00
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RAII_VAR(struct ast_datastore *, datastore, ast_sip_session_get_datastore(session, "rfc3329_store"), ao2_cleanup);
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2022-07-26 12:01:04 +00:00
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if (session->contact == NULL) {
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return;
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}
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2023-05-02 08:55:39 +00:00
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add_outgoing_request_headers(session->endpoint, session->contact, tdata, datastore);
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2022-07-26 12:01:04 +00:00
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}
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static struct ast_sip_session_supplement rfc3329_supplement = {
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.incoming_response = rfc3329_incoming_response,
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.outgoing_request = rfc3329_outgoing_request,
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};
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static void rfc3329_options_request(struct ast_sip_endpoint *endpoint, struct ast_sip_contact *contact, struct pjsip_tx_data *tdata)
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{
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2023-05-02 08:55:39 +00:00
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add_outgoing_request_headers(endpoint, contact, tdata, NULL);
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2022-07-26 12:01:04 +00:00
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}
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static struct ast_sip_supplement rfc3329_options_supplement = {
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.method = "OPTIONS",
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.outgoing_request = rfc3329_options_request,
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};
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static int load_module(void)
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{
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ast_sip_session_register_supplement(&rfc3329_supplement);
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ast_sip_register_supplement(&rfc3329_options_supplement);
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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ast_sip_session_unregister_supplement(&rfc3329_supplement);
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2023-05-02 08:55:39 +00:00
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ast_sip_unregister_supplement(&rfc3329_options_supplement);
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2022-07-26 12:01:04 +00:00
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return 0;
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}
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2023-05-02 08:55:39 +00:00
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP RFC3329 Support (partial)",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND,
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.requires = "res_pjsip,res_pjsip_session",
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);
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