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asterisk
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Highlightning even more bugs in the current tcp/tls implementation. 

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@148473 f38db490-d61c-443f-a65b-d21fe96a405b
This commit is contained in:
oej 2008-10-13 15:49:01 +00:00
parent a65cf386c5
commit b8439e4fb9
2 changed files with 111 additions and 31 deletions
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134
channels/chan_sip.c
View File

@ -729,6 +729,8 @@ static char default_mohsuggest[MAX_MUSICCLASS]; /*!< Global setting for moh c
static char default_parkinglot[AST_MAX_CONTEXT]; /*!< Parkinglot */
static int default_maxcallbitrate; /*!< Maximum bitrate for call */
static struct ast_codec_pref default_prefs; /*!< Default codec prefs */
static unsigned int default_transports; /*!< Default Transports (enum sip_transport) that are acceptable */
static unsigned int default_primary_transport; /*!< Default primary Transport (enum sip_transport) for outbound connections to devices */
/*! \brief a place to store all global settings for the sip channel driver */
struct sip_settings {
@ -1484,7 +1486,7 @@ struct sip_mailbox {
struct sip_peer {
char name[80]; /*!< peer->name is the unique name of this object */
struct sip_socket socket; /*!< Socket used for this peer */
unsigned int transports:3; /*!< Transports (enum sip_transport) that are acceptable for this peer */
unsigned int transports:3; /*!< Transports (enum sip_transport) that are acceptable for this peer */
char secret[80]; /*!< Password */
char md5secret[80]; /*!< Password in MD5 */
struct sip_auth *auth; /*!< Realm authentication list */
@ -2000,7 +2002,7 @@ static int do_magic_pickup(struct ast_channel *channel, const char *extension, c
else if (!(peer->transports & tmpl->socket.type)) {\
ast_log(LOG_ERROR, \
"'%s' is not a valid transport for '%s'. we only use '%s'! ending call.\n", \
get_transport(tmpl->socket.type), peer->name, get_transport_list(peer) \
get_transport(tmpl->socket.type), peer->name, get_transport_list(peer->transports) \
); \
ret = 1; \
} else if (peer->socket.type & SIP_TRANSPORT_TLS) { \
@ -2300,7 +2302,7 @@ static struct server_args sip_tcp_desc = {
.master = AST_PTHREADT_NULL,
.tls_cfg = NULL,
.poll_timeout = -1,
.name = "sip tcp server",
.name = "SIP TCP server",
.accept_fn = ast_tcptls_server_root,
.worker_fn = sip_tcp_worker_fn,
};
@ -2311,7 +2313,7 @@ static struct server_args sip_tls_desc = {
.master = AST_PTHREADT_NULL,
.tls_cfg = &sip_tls_cfg,
.poll_timeout = -1,
.name = "sip tls server",
.name = "SIP TLS server",
.accept_fn = ast_tcptls_server_root,
.worker_fn = sip_tcp_worker_fn,
};
@ -2385,6 +2387,8 @@ static void *_sip_tcp_helper_thread(struct sip_pvt *pvt, struct ast_tcptls_sessi
else
me->type = SIP_TRANSPORT_TCP;
ast_debug(2, "Starting thread for %s server\n", ser->ssl ? "SSL" : "TCP");
AST_LIST_LOCK(&threadl);
AST_LIST_INSERT_TAIL(&threadl, me, list);
AST_LIST_UNLOCK(&threadl);
@ -2411,7 +2415,7 @@ static void *_sip_tcp_helper_thread(struct sip_pvt *pvt, struct ast_tcptls_sessi
}
res = ast_wait_for_input(ser->fd, -1);
if (res < 0) {
ast_debug(1, "ast_wait_for_input returned %d\n", res);
ast_debug(2, "SIP %s server :: ast_wait_for_input returned %d\n", ser->ssl ? "SSL": "TCP", res);
goto cleanup;
}
@ -2430,6 +2434,7 @@ static void *_sip_tcp_helper_thread(struct sip_pvt *pvt, struct ast_tcptls_sessi
}
copy_request(&reqcpy, &req);
parse_request(&reqcpy);
/* In order to know how much to read, we need the content-length header */
if (sscanf(get_header(&reqcpy, "Content-Length"), "%d", &cl)) {
while (cl > 0) {
ast_mutex_lock(&ser->lock);
@ -2445,6 +2450,9 @@ static void *_sip_tcp_helper_thread(struct sip_pvt *pvt, struct ast_tcptls_sessi
req.len = req.data->used;
}
}
/*! \todo XXX If there's no Content-Length or if the content-lenght and what
we receive is not the same - we should generate an error */
req.socket.ser = ser;
handle_request_do(&req, &ser->requestor);
}
@ -2466,6 +2474,8 @@ cleanup2:
ast_free(req.data);
req.data = NULL;
}
ast_debug(2, "Shutting down thread for %s server\n", ser->ssl ? "SSL" : "TCP");
ao2_ref(ser, -1);
@ -2774,8 +2784,9 @@ static inline int sip_debug_test_pvt(struct sip_pvt *p)
return sip_debug_test_addr(sip_real_dst(p));
}
static inline const char *get_transport_list(struct sip_peer *peer) {
switch (peer->transports) {
/*! \brief Return configuration of transports for a device */
static inline const char *get_transport_list(unsigned int transports) {
switch (transports) {
case SIP_TRANSPORT_UDP:
return "UDP";
case SIP_TRANSPORT_TCP:
@ -2789,11 +2800,12 @@ static inline const char *get_transport_list(struct sip_peer *peer) {
case SIP_TRANSPORT_TCP | SIP_TRANSPORT_TLS:
return "TLS,TCP";
default:
return peer->transports ?
return transports ?
"TLS,TCP,UDP" : "UNKNOWN";
}
}
/*! \brief Return transport as string */
static inline const char *get_transport(enum sip_transport t)
{
switch (t) {
@ -2808,6 +2820,12 @@ static inline const char *get_transport(enum sip_transport t)
return "UNKNOWN";
}
/*! \brief Return transport of dialog.
\note this is based on a false assumption. We don't always use the
outbound proxy for all requests in a dialog. It depends on the
"force" parameter. The FIRST request is always sent to the ob proxy.
\todo Fix this function to work correctly
*/
static inline const char *get_transport_pvt(struct sip_pvt *p)
{
if (p->outboundproxy && p->outboundproxy->transport)
@ -2826,7 +2844,7 @@ static int __sip_xmit(struct sip_pvt *p, struct ast_str *data, int len)
int res = 0;
const struct sockaddr_in *dst = sip_real_dst(p);
ast_debug(1, "Trying to put '%.10s' onto %s socket destined for %s:%d\n", data->str, get_transport_pvt(p), ast_inet_ntoa(dst->sin_addr), htons(dst->sin_port));
ast_debug(2, "Trying to put '%.10s' onto %s socket destined for %s:%d\n", data->str, get_transport_pvt(p), ast_inet_ntoa(dst->sin_addr), htons(dst->sin_port));
if (sip_prepare_socket(p) < 0)
return XMIT_ERROR;
@ -2840,7 +2858,7 @@ static int __sip_xmit(struct sip_pvt *p, struct ast_str *data, int len)
if (p->socket.ser->f)
res = ast_tcptls_server_write(p->socket.ser, data->str, len);
else
ast_debug(1, "No p->socket.ser->f len=%d\n", len);
ast_debug(2, "No p->socket.ser->f len=%d\n", len);
}
if (p->socket.ser)
@ -3117,14 +3135,15 @@ static enum sip_result __sip_reliable_xmit(struct sip_pvt *p, int seqno, int res
/* If the transport is something reliable (TCP or TLS) then don't really send this reliably */
/* I removed the code from retrans_pkt that does the same thing so it doesn't get loaded into the scheduler */
/* According to the RFC some packets need to be retransmitted even if its TCP, so this needs to get revisited */
/*! \todo According to the RFC some packets need to be retransmitted even if its TCP, so this needs to get revisited */
if (!(p->socket.type & SIP_TRANSPORT_UDP)) {
xmitres = __sip_xmit(dialog_ref(p, "pasing dialog ptr into callback..."), data, len); /* Send packet */
xmitres = __sip_xmit(dialog_ref(p, "passing dialog ptr into callback..."), data, len); /* Send packet */
if (xmitres == XMIT_ERROR) { /* Serious network trouble, no need to try again */
append_history(p, "XmitErr", "%s", fatal ? "(Critical)" : "(Non-critical)");
return AST_FAILURE;
} else
} else {
return AST_SUCCESS;
}
}
if (!(pkt = ast_calloc(1, sizeof(*pkt) + len + 1)))
@ -4402,7 +4421,7 @@ static int create_addr(struct sip_pvt *dialog, const char *opeer, struct sockadd
/* Let's see if we can find the host in DNS. First try DNS SRV records,
then hostname lookup */
/*! \todo Fix this function. When we ask SRC, we should check all transports
/*! \todo Fix this function. When we ask for SRV, we should check all transports
In the future, we should first check NAPTR to find out transport preference
*/
hostn = peername;
@ -8976,8 +8995,10 @@ static void build_contact(struct sip_pvt *p)
ast_string_field_build(p, our_contact, "<sip:%s%s%s:%d>", p->exten, ast_strlen_zero(p->exten) ? "" : "@", ast_inet_ntoa(p->ourip.sin_addr), ntohs(p->socket.port));
else
ast_string_field_build(p, our_contact, "<sip:%s%s%s>", p->exten, ast_strlen_zero(p->exten) ? "" : "@", ast_inet_ntoa(p->ourip.sin_addr));
} else
} else {
/*! \todo We should not always add port here. Port is only added if it's non-standard (see code above) */
ast_string_field_build(p, our_contact, "<sip:%s%s%s:%d;transport=%s>", p->exten, ast_strlen_zero(p->exten) ? "" : "@", ast_inet_ntoa(p->ourip.sin_addr), ntohs(p->socket.port), get_transport_pvt(p));
}
}
/*! \brief Build the Remote Party-ID & From using callingpres options */
@ -10459,6 +10480,15 @@ static int __set_address_from_contact(const char *fullcontact, struct sockaddr_i
contact2 = contact2_buf;
/* We have only the part in <brackets> here so we just need to parse a SIP URI.*/
/*! \brief This code is wrong, it assumes that the contact we receive will use the
same transport as the request. It's not a valid assumption. The contact for
a udp connection can be a SIPS uri, or request ;transport=tcp
\todo Fix this buggy code. It doesn't even parse transport!!!!
Note: The outbound proxy could be using UDP between the proxy and Asterisk.
We still need to be able to send to the remote agent through the proxy.
*/
if (tcp) {
if (parse_uri(contact, "sips:", &contact, NULL, &host, &pt, NULL)) {
if (parse_uri(contact2, "sip:", &contact, NULL, &host, &pt, NULL))
@ -10491,6 +10521,7 @@ static int set_address_from_contact(struct sip_pvt *pvt)
if (ast_test_flag(&pvt->flags[0], SIP_NAT_ROUTE)) {
/* NAT: Don't trust the contact field. Just use what they came to us
with. */
/*! \todo We need to save the TRANSPORT here too */
pvt->sa = pvt->recv;
return 0;
}
@ -11092,7 +11123,7 @@ static enum check_auth_result register_verify(struct sip_pvt *p, struct sockaddr
ast_log(LOG_NOTICE, "Invalid to address: '%s' from %s (missing sip:) trying to use anyway...\n", c, ast_inet_ntoa(sin->sin_addr));
}
/* XXX here too we interpret a missing @domain as a name-only
/*! \todo XXX here too we interpret a missing @domain as a name-only
* URI, whereas the RFC says this is a domain-only uri.
*/
/* Strip off the domain name */
@ -11126,6 +11157,7 @@ static enum check_auth_result register_verify(struct sip_pvt *p, struct sockaddr
}
if (peer) {
/*! \todo OEJ Remove this - there's never RTP in a REGISTER dialog... */
/* Set Frame packetization */
if (p->rtp) {
ast_rtp_codec_setpref(p->rtp, &peer->prefs);
@ -13409,7 +13441,8 @@ static char *_sip_show_peer(int type, int fd, struct mansession *s, const struct
ast_cli(fd, " ToHost : %s\n", peer->tohost);
ast_cli(fd, " Addr->IP : %s Port %d\n", peer->addr.sin_addr.s_addr ? ast_inet_ntoa(peer->addr.sin_addr) : "(Unspecified)", ntohs(peer->addr.sin_port));
ast_cli(fd, " Defaddr->IP : %s Port %d\n", ast_inet_ntoa(peer->defaddr.sin_addr), ntohs(peer->defaddr.sin_port));
ast_cli(fd, " Transport : %s\n", get_transport(peer->socket.type));
ast_cli(fd, " Prim.Transp. : %s\n", get_transport(peer->socket.type));
ast_cli(fd, " Allowed.Trsp : %s\n", get_transport_list(peer->transports));
if (!ast_strlen_zero(global_regcontext))
ast_cli(fd, " Reg. exten : %s\n", peer->regexten);
ast_cli(fd, " Def. Username: %s\n", peer->username);
@ -13917,6 +13950,8 @@ static char *sip_show_settings(struct ast_cli_entry *e, int cmd, struct ast_cli_
ast_cli(a->fd, "\nDefault Settings:\n");
ast_cli(a->fd, "-----------------\n");
ast_cli(a->fd, " Allowed transports: %s\n", get_transport_list(default_transports));
ast_cli(a->fd, " Outbound transport: %s\n", get_transport(default_primary_transport));
ast_cli(a->fd, " Context: %s\n", default_context);
ast_cli(a->fd, " Nat: %s\n", nat2str(ast_test_flag(&global_flags[0], SIP_NAT)));
ast_cli(a->fd, " DTMF: %s\n", dtmfmode2str(ast_test_flag(&global_flags[0], SIP_DTMF)));
@ -15420,7 +15455,7 @@ static void check_pendings(struct sip_pvt *p)
/* Actually don't destroy us yet, wait for the 487 on our original
INVITE, but do set an autodestruct just in case we never get it. */
else {
/* We have a pending outbound invite, don't send someting
/* We have a pending outbound invite, don't send something
new in-transaction */
if (p->pendinginvite)
return;
@ -19597,6 +19632,7 @@ static int sipsock_read(int *id, int fd, short events, void *ignore)
return 1;
}
/*! \brief Handle incoming SIP message - request or response */
static int handle_request_do(struct sip_request *req, struct sockaddr_in *sin)
{
struct sip_pvt *p;
@ -19609,7 +19645,7 @@ static int handle_request_do(struct sip_request *req, struct sockaddr_in *sin)
if (pedanticsipchecking)
req->len = lws2sws(req->data->str, req->len); /* Fix multiline headers */
if (req->debug) {
ast_verbose("\n<--- SIP read from %s://%s:%d --->\n%s\n<------------->\n",
ast_verbose("\n<--- SIP read from %s:%s:%d --->\n%s\n<------------->\n",
get_transport(req->socket.type), ast_inet_ntoa(sin->sin_addr),
ntohs(sin->sin_port), req->data->str);
}
@ -19698,7 +19734,7 @@ static int sip_standard_port(struct sip_socket s)
return s.port == htons(STANDARD_SIP_PORT);
}
/*! \todo document this function. */
/*! \todo Find thread for TCP/TLS session (based on IP/Port */
static struct ast_tcptls_session_instance *sip_tcp_locate(struct sockaddr_in *s)
{
struct sip_threadinfo *th;
@ -19716,7 +19752,7 @@ static struct ast_tcptls_session_instance *sip_tcp_locate(struct sockaddr_in *s)
return NULL;
}
/*! \todo document this function. */
/*! \todo Get socket for dialog, prepare if needed, and return file handle */
static int sip_prepare_socket(struct sip_pvt *p)
{
struct sip_socket *s = &p->socket;
@ -19728,8 +19764,11 @@ static int sip_prepare_socket(struct sip_pvt *p)
};
if (s->fd != -1)
return s->fd;
return s->fd; /* This socket is already active */
/*! \todo Check this... This might be wrong, depending on the proxy configuration
If proxy is in "force" mode its correct.
*/
if (p->outboundproxy && p->outboundproxy->transport) {
s->type = p->outboundproxy->transport;
}
@ -19741,7 +19780,7 @@ static int sip_prepare_socket(struct sip_pvt *p)
ca.sin = *(sip_real_dst(p));
if ((ser = sip_tcp_locate(&ca.sin))) {
if ((ser = sip_tcp_locate(&ca.sin))) { /* Check if we have a thread handling a socket connected to this IP/port */
s->fd = ser->fd;
if (s->ser) {
ao2_ref(s->ser, -1);
@ -19768,7 +19807,7 @@ static int sip_prepare_socket(struct sip_pvt *p)
if (s->ser) {
/* the pvt socket already has a server instance ... */
} else {
s->ser = ast_tcptls_client_start(&ca);
s->ser = ast_tcptls_client_start(&ca); /* Start a client connection to this address */
}
if (!s->ser) {
@ -21548,8 +21587,10 @@ static struct sip_peer *build_peer(const char *name, struct ast_variable *v, str
}
if (!peer->socket.type) {
peer->transports = SIP_TRANSPORT_UDP;
peer->socket.type = SIP_TRANSPORT_UDP;
/* Set default set of transports */
peer->transports = default_transports;
/* Set default primary transport */
peer->socket.type = default_primary_transport;
}
if (fullcontact->used > 0) {
@ -21737,6 +21778,7 @@ static int reload_config(enum channelreloadreason reason)
default_tls_cfg.cipher = ast_strdup("");
default_tls_cfg.cafile = ast_strdup("");
default_tls_cfg.capath = ast_strdup("");
/* Initialize copy of current global_regcontext for later use in removing stale contexts */
ast_copy_string(oldcontexts, global_regcontext, sizeof(oldcontexts));
@ -21762,6 +21804,8 @@ static int reload_config(enum channelreloadreason reason)
global_outboundproxy.ip.sin_port = htons(STANDARD_SIP_PORT);
global_outboundproxy.ip.sin_family = AF_INET; /*!< Type of address: IPv4 */
global_outboundproxy.force = FALSE; /*!< Don't force proxy usage, use route: headers */
default_transports = 0; /*!< Reset default transport to zero here, default value later on */
default_primary_transport = 0; /*!< Reset default primary transport to zero here, default value later on */
ourport_tcp = STANDARD_SIP_PORT;
ourport_tls = STANDARD_TLS_PORT;
bindaddr.sin_port = htons(STANDARD_SIP_PORT);
@ -21903,6 +21947,25 @@ static int reload_config(enum channelreloadreason reason)
global_timer_b = global_t1 * 64;
} else if (!strcasecmp(v->name, "t1min")) {
global_t1min = atoi(v->value);
} else if (!strcasecmp(v->name, "transport") && !ast_strlen_zero(v->value)) {
char *val = ast_strdupa(v->value);
char *trans;
while ((trans = strsep(&val, ","))) {
trans = ast_skip_blanks(trans);
if (!strncasecmp(trans, "udp", 3))
default_transports |= SIP_TRANSPORT_UDP;
else if (!strncasecmp(trans, "tcp", 3))
default_transports |= SIP_TRANSPORT_TCP;
else if (!strncasecmp(trans, "tls", 3))
default_transports |= SIP_TRANSPORT_TLS;
else
ast_log(LOG_NOTICE, "'%s' is not a valid transport type. if no other is specified, udp will be used.\n", trans);
if (default_primary_transport == 0) {
default_primary_transport = default_transports;
}
}
} else if (!strcasecmp(v->name, "tcpenable")) {
sip_tcp_desc.sin.sin_family = ast_false(v->value) ? 0 : AF_INET;
ast_debug(2, "Enabling TCP socket for listening\n");
@ -22253,6 +22316,10 @@ static int reload_config(enum channelreloadreason reason)
ast_log(LOG_WARNING, "To disallow external domains, you need to configure local SIP domains.\n");
allow_external_domains = 1;
}
/* If not configured, set default transports */
if (default_transports == 0) {
default_transports = default_primary_transport = SIP_TRANSPORT_UDP;
}
/* Build list of authentication to various SIP realms, i.e. service providers */
for (v = ast_variable_browse(cfg, "authentication"); v ; v = v->next) {
@ -22406,13 +22473,24 @@ static int reload_config(enum channelreloadreason reason)
/* Start TCP server */
ast_tcptls_server_start(&sip_tcp_desc);
if (sip_tcp_desc.accept_fd == -1 && sip_tcp_desc.sin.sin_family == AF_INET) {
/* TCP server start failed. Tell the admin */
ast_log(LOG_ERROR, "SIP TCP Server start failed. Not listening on TCP socket.\n");
sip_tcp_desc.sin.sin_family = 0;
} else {
ast_debug(2, "SIP TCP server started\n");
}
/* Start TLS server if needed */
memcpy(sip_tls_desc.tls_cfg, &default_tls_cfg, sizeof(default_tls_cfg));
if (ast_ssl_setup(sip_tls_desc.tls_cfg))
if (ast_ssl_setup(sip_tls_desc.tls_cfg)) {
ast_tcptls_server_start(&sip_tls_desc);
else if (sip_tls_desc.tls_cfg->enabled) {
if (default_tls_cfg.enabled && sip_tls_desc.accept_fd == -1) {
ast_log(LOG_ERROR, "TLS Server start failed. Not listening on TLS socket.\n");
sip_tls_desc.tls_cfg = NULL;
}
} else if (sip_tls_desc.tls_cfg->enabled) {
sip_tls_desc.tls_cfg = NULL;
ast_log(LOG_WARNING, "SIP TLS server did not load because of errors.\n");
}

8
main/tcptls.c
View File

@ -319,13 +319,14 @@ void ast_tcptls_server_start(struct server_args *desc)
close(desc->accept_fd);
/* If there's no new server, stop here */
if (desc->sin.sin_family == 0)
if (desc->sin.sin_family == 0) {
ast_debug(2, "Server disabled: %s\n", desc->name);
return;
}
desc->accept_fd = socket(AF_INET, SOCK_STREAM, 0);
if (desc->accept_fd < 0) {
ast_log(LOG_ERROR, "Unable to allocate socket for %s: %s\n",
desc->name, strerror(errno));
ast_log(LOG_ERROR, "Unable to allocate socket for %s: %s\n", desc->name, strerror(errno));
return;
}
@ -368,6 +369,7 @@ void ast_tcptls_server_stop(struct server_args *desc)
if (desc->accept_fd != -1)
close(desc->accept_fd);
desc->accept_fd = -1;
ast_debug(2, "Stopped server :: %s\n", desc->name);
}
/*! \brief