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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2012, Digium, Inc.
*
* Michael L. Young <elgueromexicano@gmail.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*!
* \file
*
* \brief Generate security events in the SIP channel
*
* \author Michael L. Young <elgueromexicano@gmail.com>
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: 412115 $")
#include "include/sip.h"
#include "include/security_events.h"
/*! \brief Determine transport type used to receive request*/
static enum ast_security_event_transport_type security_event_get_transport(const struct sip_pvt *p)
{
int res = 0;
switch (p->socket.type) {
case SIP_TRANSPORT_UDP:
return AST_SECURITY_EVENT_TRANSPORT_UDP;
case SIP_TRANSPORT_TCP:
case SIP_TRANSPORT_WS:
return AST_SECURITY_EVENT_TRANSPORT_TCP;
case SIP_TRANSPORT_TLS:
case SIP_TRANSPORT_WSS:
return AST_SECURITY_EVENT_TRANSPORT_TLS;
}
return res;
}
void sip_report_invalid_peer(const struct sip_pvt *p)
{
char session_id[32];
struct ast_security_event_inval_acct_id inval_acct_id = {
.common.event_type = AST_SECURITY_EVENT_INVAL_ACCT_ID,
.common.version = AST_SECURITY_EVENT_INVAL_ACCT_ID_VERSION,
.common.service = "SIP",
.common.account_id = p->exten,
.common.local_addr = {
.addr = &p->ourip,
.transport = security_event_get_transport(p)
},
.common.remote_addr = {
.addr = &p->sa,
.transport = security_event_get_transport(p)
},
.common.session_id = session_id,
};
snprintf(session_id, sizeof(session_id), "%p", p);
ast_security_event_report(AST_SEC_EVT(&inval_acct_id));
}
void sip_report_failed_acl(const struct sip_pvt *p, const char *aclname)
{
char session_id[32];
struct ast_security_event_failed_acl failed_acl_event = {
.common.event_type = AST_SECURITY_EVENT_FAILED_ACL,
.common.version = AST_SECURITY_EVENT_FAILED_ACL_VERSION,
.common.service = "SIP",
.common.account_id = p->exten,
.common.local_addr = {
.addr = &p->ourip,
.transport = security_event_get_transport(p)
},
.common.remote_addr = {
.addr = &p->sa,
.transport = security_event_get_transport(p)
},
.common.session_id = session_id,
.acl_name = aclname,
};
snprintf(session_id, sizeof(session_id), "%p", p);
ast_security_event_report(AST_SEC_EVT(&failed_acl_event));
}
void sip_report_inval_password(const struct sip_pvt *p, const char *response_challenge, const char *response_hash)
{
char session_id[32];
struct ast_security_event_inval_password inval_password = {
.common.event_type = AST_SECURITY_EVENT_INVAL_PASSWORD,
.common.version = AST_SECURITY_EVENT_INVAL_PASSWORD_VERSION,
.common.service = "SIP",
.common.account_id = p->exten,
.common.local_addr = {
.addr = &p->ourip,
.transport = security_event_get_transport(p)
},
.common.remote_addr = {
.addr = &p->sa,
.transport = security_event_get_transport(p)
},
.common.session_id = session_id,
.challenge = p->nonce,
.received_challenge = response_challenge,
.received_hash = response_hash,
};
snprintf(session_id, sizeof(session_id), "%p", p);
ast_security_event_report(AST_SEC_EVT(&inval_password));
}
void sip_report_auth_success(const struct sip_pvt *p, uint32_t *using_password)
{
char session_id[32];
struct ast_security_event_successful_auth successful_auth = {
.common.event_type = AST_SECURITY_EVENT_SUCCESSFUL_AUTH,
.common.version = AST_SECURITY_EVENT_SUCCESSFUL_AUTH_VERSION,
.common.service = "SIP",
.common.account_id = p->exten,
.common.local_addr = {
.addr = &p->ourip,
.transport = security_event_get_transport(p)
},
.common.remote_addr = {
.addr = &p->sa,
.transport = security_event_get_transport(p)
},
.common.session_id = session_id,
.using_password = using_password,
};
snprintf(session_id, sizeof(session_id), "%p", p);
ast_security_event_report(AST_SEC_EVT(&successful_auth));
}
void sip_report_session_limit(const struct sip_pvt *p)
{
char session_id[32];
struct ast_security_event_session_limit session_limit = {
.common.event_type = AST_SECURITY_EVENT_SESSION_LIMIT,
.common.version = AST_SECURITY_EVENT_SESSION_LIMIT_VERSION,
.common.service = "SIP",
.common.account_id = p->exten,
.common.local_addr = {
.addr = &p->ourip,
.transport = security_event_get_transport(p)
},
.common.remote_addr = {
.addr = &p->sa,
.transport = security_event_get_transport(p)
},
.common.session_id = session_id,
};
snprintf(session_id, sizeof(session_id), "%p", p);
ast_security_event_report(AST_SEC_EVT(&session_limit));
}
void sip_report_failed_challenge_response(const struct sip_pvt *p, const char *response, const char *expected_response)
{
char session_id[32];
char account_id[256];
struct ast_security_event_chal_resp_failed chal_resp_failed = {
.common.event_type = AST_SECURITY_EVENT_CHAL_RESP_FAILED,
.common.version = AST_SECURITY_EVENT_CHAL_RESP_FAILED_VERSION,
.common.service = "SIP",
.common.account_id = account_id,
.common.local_addr = {
.addr = &p->ourip,
.transport = security_event_get_transport(p)
},
.common.remote_addr = {
.addr = &p->sa,
.transport = security_event_get_transport(p)
},
.common.session_id = session_id,
.challenge = p->nonce,
.response = response,
.expected_response = expected_response,
};
if (!ast_strlen_zero(p->from)) { /* When dialing, show account making call */
ast_copy_string(account_id, p->from, sizeof(account_id));
} else {
ast_copy_string(account_id, p->exten, sizeof(account_id));
}
snprintf(session_id, sizeof(session_id), "%p", p);
ast_security_event_report(AST_SEC_EVT(&chal_resp_failed));
}
void sip_report_chal_sent(const struct sip_pvt *p)
{
char session_id[32];
char account_id[256];
struct ast_security_event_chal_sent chal_sent = {
.common.event_type = AST_SECURITY_EVENT_CHAL_SENT,
.common.version = AST_SECURITY_EVENT_CHAL_SENT_VERSION,
.common.service = "SIP",
.common.account_id = account_id,
.common.local_addr = {
.addr = &p->ourip,
.transport = security_event_get_transport(p)
},
.common.remote_addr = {
.addr = &p->sa,
.transport = security_event_get_transport(p)
},
.common.session_id = session_id,
.challenge = p->nonce,
};
if (!ast_strlen_zero(p->from)) { /* When dialing, show account making call */
ast_copy_string(account_id, p->from, sizeof(account_id));
} else {
ast_copy_string(account_id, p->exten, sizeof(account_id));
}
snprintf(session_id, sizeof(session_id), "%p", p);
ast_security_event_report(AST_SEC_EVT(&chal_sent));
}
void sip_report_inval_transport(const struct sip_pvt *p, const char *transport)
{
char session_id[32];
struct ast_security_event_inval_transport inval_transport = {
.common.event_type = AST_SECURITY_EVENT_INVAL_TRANSPORT,
.common.version = AST_SECURITY_EVENT_INVAL_TRANSPORT_VERSION,
.common.service = "SIP",
.common.account_id = p->exten,
.common.local_addr = {
.addr = &p->ourip,
.transport = security_event_get_transport(p)
},
.common.remote_addr = {
.addr = &p->sa,
.transport = security_event_get_transport(p)
},
.common.session_id = session_id,
.transport = transport,
};
snprintf(session_id, sizeof(session_id), "%p", p);
ast_security_event_report(AST_SEC_EVT(&inval_transport));
}
int sip_report_security_event(const struct sip_pvt *p, const struct sip_request *req, const int res) {
struct sip_peer *peer_report;
enum check_auth_result res_report = res;
struct ast_str *buf;
char *c;
const char *authtoken;
char *reqheader, *respheader;
int result = 0;
char aclname[256];
struct digestkeys keys[] = {
[K_RESP] = { "response=", "" },
[K_URI] = { "uri=", "" },
[K_USER] = { "username=", "" },
[K_NONCE] = { "nonce=", "" },
[K_LAST] = { NULL, NULL}
};
peer_report = sip_find_peer(p->exten, NULL, TRUE, FINDPEERS, FALSE, 0);
switch(res_report) {
case AUTH_DONT_KNOW:
break;
case AUTH_SUCCESSFUL:
if (peer_report) {
if (ast_strlen_zero(peer_report->secret) && ast_strlen_zero(peer_report->md5secret)) {
sip_report_auth_success(p, (uint32_t *) 0);
} else {
sip_report_auth_success(p, (uint32_t *) 1);
}
}
break;
case AUTH_CHALLENGE_SENT:
sip_report_chal_sent(p);
break;
case AUTH_SECRET_FAILED:
case AUTH_USERNAME_MISMATCH:
sip_auth_headers(WWW_AUTH, &respheader, &reqheader);
authtoken = sip_get_header(req, reqheader);
buf = ast_str_thread_get(&check_auth_buf, CHECK_AUTH_BUF_INITLEN);
ast_str_set(&buf, 0, "%s", authtoken);
c = buf->str;
sip_digest_parser(c, keys);
if (res_report == AUTH_SECRET_FAILED) {
sip_report_inval_password(p, keys[K_NONCE].s, keys[K_RESP].s);
} else {
if (peer_report) {
sip_report_failed_challenge_response(p, keys[K_USER].s, peer_report->username);
}
}
break;
case AUTH_NOT_FOUND:
/* with sip_cfg.alwaysauthreject on, generates 2 events */
sip_report_invalid_peer(p);
break;
case AUTH_UNKNOWN_DOMAIN:
snprintf(aclname, sizeof(aclname), "domain_must_match");
sip_report_failed_acl(p, aclname);
break;
case AUTH_PEER_NOT_DYNAMIC:
snprintf(aclname, sizeof(aclname), "peer_not_dynamic");
sip_report_failed_acl(p, aclname);
break;
case AUTH_ACL_FAILED:
/* with sip_cfg.alwaysauthreject on, generates 2 events */
snprintf(aclname, sizeof(aclname), "device_must_match_acl");
sip_report_failed_acl(p, aclname);
break;
case AUTH_BAD_TRANSPORT:
sip_report_inval_transport(p, sip_get_transport(req->socket.type));
break;
case AUTH_RTP_FAILED:
break;
case AUTH_SESSION_LIMIT:
sip_report_session_limit(p);
break;
}
if (peer_report) {
sip_unref_peer(peer_report, "sip_report_security_event: sip_unref_peer: from handle_incoming");
}
return result;
}
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