[Freeswitch-users] WebRTC using rtp_sdes_suites=AES_CM_128_HMAC_SHA1_80

[Michael Jerris]

on DTLS this setting is currently a no-op and the suites it uses are hard coded.

> On May 9, 2018, at 2:21 PM, Mirko Brankovic <mirkobrankovic at gmail.com> wrote:
> 
> Hi,
> I had a same problem.
> Was debugging a different handshake problem, and wanted to try other chipers, but failed.
> Looks like the setting is not applied at all, and would be nice to use cheeper (network wise) encroption
> 
> On Wed, May 9, 2018, 00:52 Aqs Younas <aqsyounas at gmail.com <mailto:aqsyounas at gmail.com>> wrote:
> I would also be interested to know if you make this work. 
> 
> Best Regards, 
> 
> Aqs Younas
> 
> On 8 May 2018 at 22:11, Jerry Chinn <JHChinn at thenavisway.com <mailto:JHChinn at thenavisway.com>> wrote:
> Good Day,
> 
> Running FS 1.6.17 on CentOS 7.4
> 
>  
> 
> We are running WebRTC and are required to use AEAD_AES_256_GCM_8 or AEAD_AES_128_GCM_8 for security.
> 
> I have eliminated all of the options in the vars file except rtp_sdes_suites=AEAD_AES_256_GCM_8|AEAD_AES_128_GCM_8.
> 
>  
> 
> Calls are successfully completing, however, in debug we are seeing AES_CM_128_HMAC_SHA1_80 as the sdes suite for srtp:dtls.
> 
>  
> 
> 2018-05-04 22:38:30.429310 [INFO] switch_rtp.c:3185 Changing audio DTLS state from HANDSHAKE to SETUP
> 
> 2018-05-04 22:38:30.450549 [INFO] switch_rtp.c:3094 audio Fingerprint Verified.
> 
> 2018-05-04 22:38:30.450549 [INFO] switch_rtp.c:3908 Activating audio Secure RTP SEND
> 
> 2018-05-04 22:38:30.450549 [DEBUG] switch_core_sqldb.c:2617 Secure Type: srtp:dtls:AES_CM_128_HMAC_SHA1_80
> 
> 2018-05-04 22:38:30.450549 [INFO] switch_rtp.c:3886 Activating audio Secure RTP RECV
> 
> 2018-05-04 22:38:30.450549 [INFO] switch_rtp.c:3134 Changing audio DTLS state from SETUP to READY
> 
> 2018-05-04 22:38:30.450549 [DEBUG] switch_core_sqldb.c:2617 Secure Type: srtp:dtls:AES_CM_128_HMAC_SHA1_80
> 
> 2018-05-04 22:38:30.450549 [DEBUG] switch_rtp.c:1885 rtcp_stats_init: audio ssrc[3910337773] base_seq[2433]
> 
>  
> 
> Any ideas on how or where to change this to the desired encryption protocol?
> 
>  
> 
> Jerry Chinn
> 
> Telecom VoIP Specialist
> 
> .
> 
>  
> 
> 
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