Hello Rob!

Yes, I'm using Letsencrypt while I'm testing. But I would like to be able to use different certificates with different sockets.

I found this discussion https://github.com/kamailio/kamailio/issues/2413. Looks like I need to use "tls_set_connect_server_id()" instead of setting $xavp(tls=>server_name)" and "$xavp(tls[0]=>server_id)". Unfortunately I'm currently using Kamailio v5.4 on my test system and this function is not available. I will update Kamailio and give it another try. Then I will update everyone in the hope it will be useful for someone :)

Thank you!

Regards, Volodymyr Ivanets

чт, 29 лип. 2021 о 19:07 Rob van den Bulk <rob.van.den.bulk@gmail.com> пише:

Hello, are u using letsencrypt?

U can use a multi domain.

Muti domain names in one certificate 

Outlook voor Android downloaden

---

From: sr-users <sr-users-bounces@lists.kamailio.org> on behalf of Володимир Іванець <volodyaivanets@gmail.com>
Sent: Thursday, July 29, 2021 4:44:16 PM
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
Subject: [SR-Users] Integration with multiple MS Teams instances

 

Hello all!

I was able to connect Kamailio with MS Teams and now trying to add one more Teams instance. It looks like I have some misconfiguration or there is a bug.

My test server has 2 domain records pointing at it (kamailio.domain1.com and kamailio.domain2.com). My tls.cfg configuration file looks like this. As you can see the Default section is configured with a kamailio.domain1.com sertificate:

[server:default]

method = TLSv1.0+

require_certificate = no

verify_certificate = no

private_key = /var/kamailio/certificates/kamailio.domain1.com/server/key.pem

certificate = /var/kamailio/certificates/kamailio.domain1.com/server/cert.pem

ca_list = /var/kamailio/certificates/kamailio.domain1.com/CA/cert.pem

[client:default]

method = TLSv1.0+

require_certificate = no

verify_certificate = no

private_key = /var/kamailio/certificates/kamailio.domain1.com/server/key.pem

certificate = /var/kamailio/certificates/kamailio.domain1.com/server/cert.pem

ca_list = /var/kamailio/certificates/kamailio.domain1.com/CA/cert.pem

[server:172.16.30.206:5062]

method = TLSv1.0+

require_certificate = no

verify_certificate = no

private_key = /var/kamailio/certificates/kamailio.domain1.com/server/key.pem

certificate = /var/kamailio/certificates/kamailio.domain1.com/server/cert.pem

ca_list = /var/kamailio/certificates/kamailio.domain1.com/CA/cert.pem

server_name = "kamailio.domain1.com"

server_id = ""kamailio.domain1.com"

[client:172.16.30.206:5062]

method = TLSv1.0+

require_certificate = no

verify_certificate = no

private_key = /var/kamailio/certificates/kamailio.domain1.com/server/key.pem

certificate = /var/kamailio/certificates/kamailio.domain1.com/server/cert.pem

ca_list = /var/kamailio/certificates/kamailio.domain1.com/CA/cert.pem

[server:172.16.30.206:5063]

method = TLSv1.0+

require_certificate = no

verify_certificate = no

private_key = /var/kamailio/certificates/kamailio.domain2.com/server/key.pem

certificate = /var/kamailio/certificates/kamailio.domain2.com/server/cert.pem

ca_list = /var/kamailio/certificates/kamailio.domain2.com/CA/cert.pem

server_name = "kamailio.domain2.com"

server_id = ""kamailio.domain2.com"

[client:172.16.30.206:5063]

method = TLSv1.0+

require_certificate = no

verify_certificate = no

private_key = /var/kamailio/certificates/kamailio.domain2.com/server/key.pem

certificate = /var/kamailio/certificates/kamailio.domain2.com/server/cert.pem

ca_list = /var/kamailio/certificates/kamailio.domain2.com/CA/cert.pem

The dispatcher configuration table looks like this:

+----+-------+----------------------------------------------+-------+----------+--------------------------------------------------------------------+-------------+

| id | setid | destination                                  | flags | priority | attrs                                                              | description |

+----+-------+----------------------------------------------+-------+----------+--------------------------------------------------------------------+-------------+

|  1 |     1 | sip:sip.pstnhub.microsoft.com;transport=tls  |     0 |        3 | socket=tls:172.16.30.206:5062;ping_from=sip:kamailio.domain1.com   | MS Teams 1  |

|  2 |     2 | sip:sip.pstnhub.microsoft.com;transport=tls  |     0 |        3 | socket=tls:172.16.30.206:5063;ping_from=sip:kamailio.domain2.com   | MS Teams 2  |

+----+-------+----------------------------------------------+-------+----------+--------------------------------------------------------------------+-------------+

When Kamailio is started only connection with the first trunk is established:

# kamcmd tls.list

{

        id: 1

        timeout: 0

        src_ip: 52.114.75.24

        src_port: 5061

        dst_ip: 172.16.30.206

        dst_port: 0

        cipher: ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH     Au=RSA  Enc=AESGCM(256) Mac=AEAD

        ct_wq_size: 0

        enc_rd_buf: 0

        flags: 2

        state: established

}

{

        id: 2

        timeout: 0

        src_ip: 52.114.75.24

        src_port: 7810

        dst_ip: 172.16.30.206

        dst_port: 5062

        cipher: AES256-GCM-SHA384       TLSv1.2 Kx=RSA      Au=RSA  Enc=AESGCM(256) Mac=AEAD

        ct_wq_size: 0

        enc_rd_buf: 0

        flags: 2

        state: established

}

{

        id: 3

        timeout: 596

        src_ip: 52.114.75.24

        src_port: 7811

        dst_ip: 172.16.30.206

        dst_port: 5062

        cipher: AES256-GCM-SHA384       TLSv1.2 Kx=RSA      Au=RSA  Enc=AESGCM(256) Mac=AEAD

        ct_wq_size: 0

        enc_rd_buf: 0

        flags: 2

        state: established

}

Here is what I can see in Kamailio log file when it sends an OPTIONS request to the second trunk. Kamailio uses Default tls configuration and MS Teams don't accept it:

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: ALERT: <script>: == TRACE. tm:local-request. fs is tls:172.16.30.206:5063

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: tm [uac.c:352]: t_run_local_req(): apply new updates without Via to sip msg

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/msg_translator.c:1796]: check_boundaries(): no multi-part body

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:610]: parse_msg(): SIP Request:

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:612]: parse_msg():  method:  <OPTIONS>

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:614]: parse_msg():  uri:     <sip:sip.pstnhub.microsoft.com;transport=tls>

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:616]: parse_msg():  version: <SIP/2.0>

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/parse_via.c:1303]: parse_via_param(): Found param type 232, <branch> = <z9hG4bK169b.6411b4c3000000000000000000000000.0>; state=16

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/parse_via.c:2639]: parse_via(): end of header reached, state=5

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:498]: parse_headers(): Via found, flags=2

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:500]: parse_headers(): this is the first via

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/parse_addr_spec.c:864]: parse_addr_spec(): end of header reached, state=10

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:171]: get_hdr_field(): <To> [47]; uri=[sip:sip.pstnhub.microsoft.com;transport=tls]

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:174]: get_hdr_field(): to body (47)[<sip:sip.pstnhub.microsoft.com;transport=tls>^M

], to tag (0)[]

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:152]: get_hdr_field(): cseq <CSeq>: <10> <OPTIONS>

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:185]: get_hdr_field(): content_length=0

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:89]: get_hdr_field(): found end of header

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:610]: parse_msg(): SIP Request:

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:612]: parse_msg():  method:  <OPTIONS>

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:614]: parse_msg():  uri:     <sip:sip.pstnhub.microsoft.com;transport=tls>

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:616]: parse_msg():  version: <SIP/2.0>

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/parse_via.c:1303]: parse_via_param(): Found param type 232, <branch> = <z9hG4bK169b.6411b4c3000000000000000000000000.0>; state=16

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/parse_via.c:2639]: parse_via(): end of header reached, state=5

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:498]: parse_headers(): Via found, flags=2

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:500]: parse_headers(): this is the first via

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/parse_addr_spec.c:864]: parse_addr_spec(): end of header reached, state=10

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:171]: get_hdr_field(): <To> [47]; uri=[sip:sip.pstnhub.microsoft.com;transport=tls]

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:174]: get_hdr_field(): to body (47)[<sip:sip.pstnhub.microsoft.com;transport=tls>^M

], to tag (0)[]

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/parser/msg_parser.c:152]: get_hdr_field(): cseq <CSeq>: <10> <OPTIONS>

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: tm [uac.c:189]: uac_refresh_hdr_shortcuts(): cseq: [CSeq: 10]

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/tcp_main.c:1993]: tcp_send(): no open tcp connection found, opening new one

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/ip_addr.c:229]: print_ip(): tcpconn_new: new tcp connection: 52.114.75.24

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/tcp_main.c:1175]: tcpconn_new(): on port 5061, type 3, socket -1

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: <core> [core/tcp_main.c:1498]: tcpconn_add(): hashes: 2831:67:0, 1

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: tls [tls_server.c:199]: tls_complete_init(): completing tls connection initialization

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: tls [tls_server.c:162]: tls_get_connect_server_name(): xavp with outbound server name not found

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: tls [tls_server.c:142]: tls_get_connect_server_id(): xavp with outbound server id not found

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: tls [tls_server.c:228]: tls_complete_init(): Using initial TLS domain TLSc<default> (dom 0x7f35509da688 ctx 0x7f3550b7a568 sn [])

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: tls [tls_domain.c:1177]: tls_lookup_private_key(): Private key lookup for SSL_CTX-0x7f3550b7a568: (nil)

Jul 29 16:46:14 kamailio /usr/sbin/kamailio[11809]: DEBUG: tls [tls_domain.c:747]: sr_ssl_ctx_info_callback(): SSL handshake started

...

If I change the Default configuration to use kamailio.domain2.com certificate, the second trunk will connect but the first one will fail.

I tried to set "$xavp(tls=>server_name)" and "$xavp(tls[0]=>server_id)" variables to the event_route[tm:local-request] section but log still stated that server Name and ID were not found.

Can someone please point me in the right direction, how can I make Kamailio use the correct certificates when establishing multiple TLS connections?

Thanks a lot!

Regards, Volodymyr Ivanets

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