[SR-Users] dispatch REGISTER over TLS

[Daniel-Constantin Mierla]

Hello,

On 06.11.19 20:46, Karsten Horsmann wrote:
> Hi, 
>
> the sips Uri schemata is not used for tls with dispatcher.

jumping in to clarify a bit about sips protocol schema. It doesn't imply
TLS as one may think HTTPS does it for HTTP. The sips is mandating that
the traffic goes over secure links, which can be IPSec/VPN or even just
private network, so it is ok using UDP or TCP when sips is present.

In SIP, if TLS is wanted, then transport=tls has to be added to the URI.

As for dispatcher, one more clarification: trasport=tls in attrs has
nothing to do with the destination address, so that has to be in the
value of the destination field, as Karsten gave in his example.

And, as general note: better do not use sips at all, it can mess up some
nodes in the path, if you are not sure about the need of sips -- just do
uri;trasport=tls.

Cheers,
Daniel

>
> Here an example for flatfile dispatcher.list (need corrected values). 
>
> The socket line must match an listen directive in your Kamailio.cfg. 
>
>
> root at sbc1:~# cat /etc/kamailio/dispatcher.list
> # setid(integer) destination(sip uri) flags (integer, optional),
> priority(int,opt), attrs (str,optional)
> 1007 sip:sip.pstnhub.microsoft.com
> <http://sip.pstnhub.microsoft.com>;transport=tls 0 3
> socket=tls:212.xx.xx.xx:5061;ping_from=sip:sbc-d01.yourdomain
>
> Cheers 
> Karsten 
>
> sthustfo <sthustfo at gmail.com <mailto:sthustfo at gmail.com>> schrieb am
> Mi., 6. Nov. 2019, 20:32:
>
>     I have a basic setup where kamailio receives SIP over websocket
>     (no WSS) and forwards to SIP server over TLS. I have enabled TLS
>     in kamailio.cfg and added dispatcher node as sips:SIP_SERVER:5061
>     and transport=tls.
>
>     +----+-------+------------------------+-------+----------+---------------+----------------+
>     | id | setid | destination            | flags | priority | attrs  
>           | description    |
>     +----+-------+------------------------+-------+----------+---------------+----------------+
>     |  4 |     1 | sips:10.0.0.100:5061 <http://10.0.0.100:5061> |    
>     0 |        0 | transport=tls | SIP SERVER |
>     +----+-------+------------------------+-------+----------+---------------+----------------+
>
>     Now when REGISTER is received over websocket, kamailio is
>     responding with error code 500 and phrase "500 I'm terribly sorry,
>     server error occurred (7/SL)". And on the console I see the
>     following error messages.
>
>     12(33858) DEBUG: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} <core>
>     [core/md5utils.c:67]: MD5StringArray(): MD5 calculated:
>     f1ecf7bcb659b07fe81e332e100044e5
>     12(33858) ERROR: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} tm
>     [ut.h:315]: uri2dst2(): no corresponding socket found for
>     "10.0.0.100" af 2 (tls:10.0.0.100:5061 <http://10.0.0.100:5061>)
>     12(33858) ERROR: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} tm
>     [t_fwd.c:467]: prepare_new_uac(): can't fwd to af 2, proto 3  (no
>     corresponding listening socket)
>     12(33858) ERROR: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} tm
>     [t_fwd.c:1735]: t_forward_nonack(): failure to add branches
>     12(33858) DEBUG: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} tm
>     [t_funcs.c:334]: t_relay_to(): t_forward_nonack returned error -7 (-7)
>     12(33858) DEBUG: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} tm
>     [t_funcs.c:352]: t_relay_to(): -7 error reply generation delayed
>     12(33858) exec: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} ***
>     cfgtrace:request_route=[RELAY] c=[/etc/kamailio/kamailio.cfg]
>     l=587 a=24 n=sl_reply_error
>     12(33858) DEBUG: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} <core>
>     [core/msg_translator.c:162]: check_via_address(): (10.0.0.14,
>     hsvmphm3ps12.invalid, 0)
>     12(33858) DEBUG: {1 2521 REGISTER o9q7ujqgin33qgp00abijv}
>     websocket [ws_conn.c:452]: wsconn_get(): wsconn_get for id [3]
>
>     *tls.cfg contents*
>     [client:default]
>     method = TLSv1
>     verify_certificate = yes
>     require_certificate = yes
>     private_key = /home/test/kamailio/internal.key
>     certificate = /home/test/kamailio/internal.crt
>     ca_list = /home/test/kamailio/ca_list.pem
>
>     Any reason why this error is seen? Any inputs appreciated.
>
>     Thanks.
>     _______________________________________________
>     Kamailio (SER) - Users Mailing List
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>
>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio World Conference - April 27-29, 2020, in Berlin -- www.kamailioworld.com

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