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pjsip_transport_events: Fix possible use after free on transport

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It was possible for a module that registered for transport monitor
events to pass in a pjsip_transport that had already been freed.
This caused pjsip_transport_events to crash when looking up the
monitor for the transport.  The fix is a two pronged approach.

1. We now increment the reference count on pjsip_transports when we
create monitors for them, then decrement the count when the
transport is going to be destroyed.

2. There are now APIs to register and unregister monitor callbacks
by "transport key" which is a string concatenation of the remote ip
address and port.  This way the module needing to monitor the
transport doesn't have to hold on to the transport object itself to
unregister.  It just has to save the transport_key.

* Added the pjsip_transport reference increment and decrement.

* Changed the internal transport monitor container key from the
  transport->obj_name (which may not be unique anyway) to the
  transport_key.

* Added a helper macro AST_SIP_MAKE_REMOTE_IPADDR_PORT_STR() that
  fills a buffer with the transport_key using a passed-in
  pjsip_transport.

* Added the following functions:
  ast_sip_transport_monitor_register_key
  ast_sip_transport_monitor_register_replace_key
  ast_sip_transport_monitor_unregister_key
  and marked their non-key counterparts as deprecated.

* Updated res_pjsip_pubsub and res_pjsip_outbound_register to use
  the new "key" monitor functions.

NOTE: res_pjsip_registrar also uses the transport monitor
functionality but doesn't have a persistent object other than
contact to store a transport key.  At this time, it continues to
use the non-key monitor functions.

ASTERISK-30244

Change-Id: I1a20baf2a8643c272dcf819871d6c395f148f00b
(cherry picked from commit 7684c9e907)
This commit is contained in:
George Joseph
2022-10-10 08:35:54 -06:00
committed by Friendly Automation
parent b515b50c08
commit 120aca73ba
4 changed files with 307 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
res/res_pjsip_outbound_registration.c
View File

@@ -993,6 +993,8 @@ struct registration_response {
pjsip_rx_data *rdata;
/*! \brief Request for which the response was received */
pjsip_tx_data *old_request;
/*! \brief Key for the reliable transport in use */
char transport_key[IP6ADDR_COLON_PORT_BUFLEN];
};
/*! \brief Registration response structure destructor */
@@ -1108,13 +1110,10 @@ static int monitor_matcher(void *a, void *b)
return strcmp(ma, mb) == 0;
}
static void registration_transport_monitor_setup(pjsip_transport *transport, const char *registration_name)
static void registration_transport_monitor_setup(const char *transport_key, const char *registration_name)
{
char *monitor;
if (!PJSIP_TRANSPORT_IS_RELIABLE(transport)) {
return;
}
monitor = ao2_alloc_options(strlen(registration_name) + 1, NULL,
AO2_ALLOC_OPT_LOCK_NOLOCK);
if (!monitor) {
@@ -1127,8 +1126,8 @@ static void registration_transport_monitor_setup(pjsip_transport *transport, con
* register the monitor. We might get into a message spamming infinite
* loop of registration, shutdown, reregistration...
*/
ast_sip_transport_monitor_register(transport, registration_transport_shutdown_cb,
monitor);
ast_sip_transport_monitor_register_replace_key(transport_key, registration_transport_shutdown_cb,
monitor, monitor_matcher);
ao2_ref(monitor, -1);
}
@@ -1322,14 +1321,18 @@ static int handle_registration_response(void *data)
schedule_registration(response->client_state, next_registration_round);
/* See if we should monitor for transport shutdown */
registration_transport_monitor_setup(response->rdata->tp_info.transport,
response->client_state->registration_name);
if (PJSIP_TRANSPORT_IS_RELIABLE(response->rdata->tp_info.transport)) {
registration_transport_monitor_setup(response->transport_key,
response->client_state->registration_name);
}
} else {
ast_debug(1, "Outbound unregistration to '%s' with client '%s' successful\n", server_uri, client_uri);
update_client_state_status(response->client_state, SIP_REGISTRATION_UNREGISTERED);
ast_sip_transport_monitor_unregister(response->rdata->tp_info.transport,
registration_transport_shutdown_cb, response->client_state->registration_name,
monitor_matcher);
if (PJSIP_TRANSPORT_IS_RELIABLE(response->rdata->tp_info.transport)) {
ast_sip_transport_monitor_unregister_key(response->transport_key,
registration_transport_shutdown_cb, response->client_state->registration_name,
monitor_matcher);
}
}
save_response_fields_to_transport(response);
@@ -1445,6 +1448,9 @@ static void sip_outbound_registration_response_cb(struct pjsip_regc_cbparam *par
response->old_request = tsx->last_tx;
pjsip_tx_data_add_ref(response->old_request);
pjsip_rx_data_clone(param->rdata, 0, &response->rdata);
AST_SIP_MAKE_REMOTE_IPADDR_PORT_STR(param->rdata->tp_info.transport,
response->transport_key);
} else {
/* old_request steals the reference */
response->old_request = client_state->last_tdata;