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273 lines
8.3 KiB
273 lines
8.3 KiB
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, Digium, Inc.
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*
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* Mark Michelson <mmichelson@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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/*** MODULEINFO
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<depend>pjproject</depend>
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<depend>res_pjsip</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 "asterisk/res_pjsip.h"
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#include "asterisk/module.h"
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#include "asterisk/logger.h"
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#include "asterisk/sorcery.h"
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#include "asterisk/acl.h"
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/*** DOCUMENTATION
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<configInfo name="res_pjsip_acl" language="en_US">
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<synopsis>SIP ACL module</synopsis>
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<description><para>
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<emphasis>ACL</emphasis>
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</para>
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<para>The ACL module used by <literal>res_pjsip</literal>. This module is
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independent of <literal>endpoints</literal> and operates on all inbound
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SIP communication using res_pjsip.
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</para><para>
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It should be noted that this module can also reference ACLs from
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<filename>acl.conf</filename>.
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</para><para>
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There are two main ways of creating an access list: <literal>IP-Domain</literal>
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and <literal>Contact Header</literal>. It is possible to create a combined ACL using
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both IP and Contact.
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</para></description>
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<configFile name="pjsip.conf">
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<configObject name="acl">
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<synopsis>Access Control List</synopsis>
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<configOption name="acl">
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<synopsis>Name of IP ACL</synopsis>
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<description><para>
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This matches sections configured in <literal>acl.conf</literal>
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</para></description>
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</configOption>
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<configOption name="contactacl">
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<synopsis>Name of Contact ACL</synopsis>
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<description><para>
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This matches sections configured in <literal>acl.conf</literal>
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</para></description>
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</configOption>
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<configOption name="contactdeny">
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<synopsis>List of Contact Header addresses to Deny</synopsis>
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</configOption>
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<configOption name="contactpermit">
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<synopsis>List of Contact Header addresses to Permit</synopsis>
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</configOption>
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<configOption name="deny">
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<synopsis>List of IP-domains to deny access from</synopsis>
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</configOption>
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<configOption name="permit">
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<synopsis>List of IP-domains to allow access from</synopsis>
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</configOption>
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<configOption name="type">
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<synopsis>Must be of type 'security'.</synopsis>
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</configOption>
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</configObject>
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</configFile>
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</configInfo>
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***/
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static int apply_acl(pjsip_rx_data *rdata, struct ast_acl_list *acl)
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{
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struct ast_sockaddr addr;
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if (ast_acl_list_is_empty(acl)) {
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return 0;
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}
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memset(&addr, 0, sizeof(addr));
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ast_sockaddr_parse(&addr, rdata->pkt_info.src_name, PARSE_PORT_FORBID);
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ast_sockaddr_set_port(&addr, rdata->pkt_info.src_port);
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if (ast_apply_acl(acl, &addr, "SIP ACL: ") != AST_SENSE_ALLOW) {
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ast_log(LOG_WARNING, "Incoming SIP message from %s did not pass ACL test\n", ast_sockaddr_stringify(&addr));
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return 1;
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}
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return 0;
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}
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static int extract_contact_addr(pjsip_contact_hdr *contact, struct ast_sockaddr **addrs)
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{
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pjsip_sip_uri *sip_uri;
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char host[256];
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if (!contact) {
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return 0;
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}
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if (!PJSIP_URI_SCHEME_IS_SIP(contact->uri) && !PJSIP_URI_SCHEME_IS_SIPS(contact->uri)) {
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return 0;
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}
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sip_uri = pjsip_uri_get_uri(contact->uri);
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ast_copy_pj_str(host, &sip_uri->host, sizeof(host));
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return ast_sockaddr_resolve(addrs, host, PARSE_PORT_FORBID, AST_AF_UNSPEC);
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}
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static int apply_contact_acl(pjsip_rx_data *rdata, struct ast_acl_list *contact_acl)
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{
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int num_contact_addrs;
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int forbidden = 0;
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struct ast_sockaddr *contact_addrs;
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int i;
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pjsip_contact_hdr *contact = (pjsip_contact_hdr *)&rdata->msg_info.msg->hdr;
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if (ast_acl_list_is_empty(contact_acl)) {
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return 0;
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}
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while ((contact = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_CONTACT, contact->next))) {
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num_contact_addrs = extract_contact_addr(contact, &contact_addrs);
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if (num_contact_addrs <= 0) {
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continue;
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}
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for (i = 0; i < num_contact_addrs; ++i) {
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if (ast_apply_acl(contact_acl, &contact_addrs[i], "SIP Contact ACL: ") != AST_SENSE_ALLOW) {
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ast_log(LOG_WARNING, "Incoming SIP message from %s did not pass ACL test\n", ast_sockaddr_stringify(&contact_addrs[i]));
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forbidden = 1;
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break;
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}
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}
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ast_free(contact_addrs);
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if (forbidden) {
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/* No use checking other contacts if we already have failed ACL check */
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break;
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}
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}
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return forbidden;
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}
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#define SIP_SORCERY_ACL_TYPE "acl"
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/*!
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* \brief SIP ACL details and configuration.
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*/
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struct ast_sip_acl {
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SORCERY_OBJECT(details);
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struct ast_acl_list *acl;
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struct ast_acl_list *contact_acl;
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};
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static int check_acls(void *obj, void *arg, int flags)
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{
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struct ast_sip_acl *sip_acl = obj;
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pjsip_rx_data *rdata = arg;
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if (apply_acl(rdata, sip_acl->acl) ||
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apply_contact_acl(rdata, sip_acl->contact_acl)) {
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return CMP_MATCH | CMP_STOP;
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}
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return 0;
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}
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static pj_bool_t acl_on_rx_msg(pjsip_rx_data *rdata)
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{
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RAII_VAR(struct ao2_container *, acls, ast_sorcery_retrieve_by_fields(
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ast_sip_get_sorcery(), SIP_SORCERY_ACL_TYPE,
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AST_RETRIEVE_FLAG_MULTIPLE | AST_RETRIEVE_FLAG_ALL, NULL), ao2_cleanup);
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RAII_VAR(struct ast_sip_acl *, matched_acl, NULL, ao2_cleanup);
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if (!acls) {
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ast_log(LOG_ERROR, "Unable to retrieve ACL sorcery data\n");
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return PJ_FALSE;
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}
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if ((matched_acl = ao2_callback(acls, 0, check_acls, rdata))) {
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if (rdata->msg_info.msg->line.req.method.id != PJSIP_ACK_METHOD) {
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pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 403, NULL, NULL, NULL);
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}
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return PJ_TRUE;
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}
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return PJ_FALSE;
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}
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static int acl_handler(const struct aco_option *opt, struct ast_variable *var, void *obj)
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{
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struct ast_sip_acl *sip_acl = obj;
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int error = 0;
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int ignore;
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if (!strncmp(var->name, "contact", 7)) {
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ast_append_acl(var->name + 7, var->value, &sip_acl->contact_acl, &error, &ignore);
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} else {
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ast_append_acl(var->name, var->value, &sip_acl->acl, &error, &ignore);
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}
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return error;
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}
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static pjsip_module acl_module = {
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.name = { "ACL Module", 14 },
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/* This should run after a logger but before anything else */
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.priority = 1,
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.on_rx_request = acl_on_rx_msg,
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};
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static void acl_destroy(void *obj)
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{
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struct ast_sip_acl *sip_acl = obj;
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sip_acl->acl = ast_free_acl_list(sip_acl->acl);
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sip_acl->contact_acl = ast_free_acl_list(sip_acl->contact_acl);
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}
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static void *acl_alloc(const char *name)
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{
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struct ast_sip_acl *sip_acl =
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ast_sorcery_generic_alloc(sizeof(*sip_acl), acl_destroy);
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return sip_acl;
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}
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static int load_module(void)
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{
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ast_sorcery_apply_default(ast_sip_get_sorcery(), SIP_SORCERY_ACL_TYPE,
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"config", "pjsip.conf,criteria=type=acl");
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if (ast_sorcery_object_register(ast_sip_get_sorcery(), SIP_SORCERY_ACL_TYPE,
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acl_alloc, NULL, NULL)) {
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ast_log(LOG_ERROR, "Failed to register SIP %s object with sorcery\n",
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SIP_SORCERY_ACL_TYPE);
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return AST_MODULE_LOAD_DECLINE;
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}
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ast_sorcery_object_field_register(ast_sip_get_sorcery(), SIP_SORCERY_ACL_TYPE, "type", "", OPT_NOOP_T, 0, 0);
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ast_sorcery_object_field_register_custom(ast_sip_get_sorcery(), SIP_SORCERY_ACL_TYPE, "permit", "", acl_handler, NULL, 0, 0);
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ast_sorcery_object_field_register_custom(ast_sip_get_sorcery(), SIP_SORCERY_ACL_TYPE, "deny", "", acl_handler, NULL, 0, 0);
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ast_sorcery_object_field_register_custom(ast_sip_get_sorcery(), SIP_SORCERY_ACL_TYPE, "acl", "", acl_handler, NULL, 0, 0);
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ast_sorcery_object_field_register_custom(ast_sip_get_sorcery(), SIP_SORCERY_ACL_TYPE, "contactpermit", "", acl_handler, NULL, 0, 0);
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ast_sorcery_object_field_register_custom(ast_sip_get_sorcery(), SIP_SORCERY_ACL_TYPE, "contactdeny", "", acl_handler, NULL, 0, 0);
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ast_sorcery_object_field_register_custom(ast_sip_get_sorcery(), SIP_SORCERY_ACL_TYPE, "contactacl", "", acl_handler, NULL, 0, 0);
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ast_sip_register_service(&acl_module);
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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_unregister_service(&acl_module);
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP ACL Resource",
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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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);
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