2 Nov
2016
2 Nov
'16
9:35 a.m.
Hi All.
After some try to configure kamailio 4.4.3 to act as SPI TLS client for Cisco SIP TLS
gateways I have found one issue.
If I do client configuration for tls
[client:10.1.23.19:5061]
verify_certificate = yes
ca_list = /etc/kamailio/CAs/ca1.pem
[client:10.1.23.29:5061]
verify_certificate = yes
ca_list = /etc/kamailio/CAs/ca2.pem
[client:default]
verify_certificate = no
require_certificate = no
Kamailo always do default profile selection (I do configuration without server_name or
server_id, with it kamailio works fine but there are some troubles to make selection of
this parameters from
config script, I need additional checks and queries)
after some research in tls module source code I have added some debug information in file
tls_server.c:
```
if (c->flags & F_CONN_PASSIVE) {
state=S_TLS_ACCEPTING;
dom = tls_lookup_cfg(cfg, TLS_DOMAIN_SRV,
&c->rcv.dst_ip, c->rcv.dst_port, 0, 0);
} else {
state=S_TLS_CONNECTING;
sname = tls_get_connect_server_name();
srvid = tls_get_connect_server_id();
// -------------------------------------------------------------
DBG("Entered client config loockup (c->rcv.dst_port %d)\n",
c->rcv.dst_port);
DBG("Entered client config loockup (&c->rcv.dst_ip
%s)\n", ip_addr2a(&c->rcv.dst_ip));
DBG("Entered client config loockup (c->rcv.src_port %d)\n",
c->rcv.src_port);
DBG("Entered client config loockup (&c->rcv.src_ip
%s)\n", ip_addr2a(&c->rcv.src_ip));
// -------------------------------------------------------------
dom = tls_lookup_cfg(cfg, TLS_DOMAIN_CLI,
&c->rcv.dst_ip, c->rcv.dst_port, sname, srvid);
}
```
After making a test call:
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: <core>
[parser/msg_parser.c:597]: parse_msg(): method: <INVITE>
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: <core>
[parser/msg_parser.c:599]: parse_msg(): uri:
<sip:9098@10.1.23.19:5061;transport=TLS>
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: <core>
[parser/msg_parser.c:601]: parse_msg(): version: <SIP/2.0>
I see:
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: <core> [ip_addr.c:229]:
print_ip(): tcpconn_new: new tcp connection: 10.1.23.19
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: <core> [tcp_main.c:985]:
tcpconn_new(): on port 5061, type 3
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: <core> [tcp_main.c:1295]:
tcpconn_add(): hashes: 1394:0:0, 1
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: tls [tls_server.c:197]:
tls_complete_init(): completing tls connection initialization
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: tls [tls_server.c:160]:
tls_get_connect_server_name(): xavp with outbound server name not found
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: tls [tls_server.c:140]:
tls_get_connect_server_id(): xavp with outbound server id not found
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: tls [tls_server.c:219]:
tls_complete_init(): Entered client config loockup (c->rcv.dst_port 40123)
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: tls [tls_server.c:220]:
tls_complete_init(): Entered client config loockup (&c->rcv.dst_ip 10.1.23.23)
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: tls [tls_server.c:221]:
tls_complete_init(): Entered client config loockup (c->rcv.src_port 5061)
Oct 26 09:23:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: tls [tls_server.c:222]:
tls_complete_init(): Entered client config loockup (&c->rcv.src_ip 10.1.23.19)
Where:
**&c->rcv.dst_ip 10.1.23.23** - it is my local kamailio tls socket ip address to
make tls connect from
**c->rcv.dst_port 40123** - it is my local kamailio tls socket port
**&c->rcv.src_ip 10.1.23.19** - ip of my TLS device to make tls connection to
**c->rcv.src_port 5061** - port of my TLS device to make tls connection to
so if I change line
```
dom = tls_lookup_cfg(cfg, TLS_DOMAIN_CLI,
&c->rcv.dst_ip, c->rcv.dst_port, sname, srvid);
to
```
```
dom = tls_lookup_cfg(cfg, TLS_DOMAIN_CLI,
&c->rcv.src_ip, c->rcv.src_port, sname, srvid);
```
I got correct client domain selection from tls.cfg:
Oct 26 09:33:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: tls [tls_server.c:233]:
tls_complete_init(): Using initial TLS domain TLSc<10.1.23.19:5061> (dom
0x7fd2eefa3d68 ctx 0x7fd2ef7e70a8 sn [])
Oct 26 09:33:56 sip1 /usr/sbin/kamailio[20712]: DEBUG: tls [tls_domain.c:703]:
sr_ssl_ctx_info_callback(): SSL handshake started
You can view, comment on, or merge this pull request online at:
https://github.com/kamailio/kamailio/pull/842
-- Commit Summary --
* Merge pull request #3 from kamailio/master
* modules/tls: fix TLS client config selection based on dst ip and port
-- File Changes --
M modules/tls/tls_server.c (2)
-- Patch Links --
https://github.com/kamailio/kamailio/pull/842.patch
https://github.com/kamailio/kamailio/pull/842.diff
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https://github.com/kamailio/kamailio/pull/842