[Freeswitch-users] To decypt webrtc audio

Fri Oct 31 16:35:36 MSK 2014

The way I use rtpengine, it rewrites SDP between the browser and Asterisk
1.4, terminating DTLS and ICE. Between the browser and rtpengine is
RTP/SAVPF, while between rtpengine and Asterisk is RTP/AVP. rtpengine
generates its keys in what I assume to be the same way the browsers do.

On 31 October 2014 10:51, Anthony Minessale <anthony.minessale at gmail.com>
wrote:

> The tool from pjsip mentioned above requires the keys for the srtp
> decryption.  Does the one you mention do it differently?
>
>
> On Friday, October 31, 2014, Ben Langfeld <ben at langfeld.co.uk> wrote:
>
>> Anthony, I think I'm not understanding your concern. Could you explain
>> what you mean by logging the keys?
>>
>> On 30 October 2014 21:01, Anthony Minessale <anthony.minessale at gmail.com>
>> wrote:
>>
>>> The bigger question is how to log the keys without compromising the
>>> point of why its all encrypted.
>>> It would take some careful consideration.
>>>
>>>
>>> On Thu, Oct 30, 2014 at 12:32 PM, Ben Langfeld <ben at langfeld.co.uk>
>>> wrote:
>>>
>>>> rtpengine does indeed allow decryption of DTLS encrypted RTP. I use it
>>>> in front of Asterisk 1.4 for exactly that (and ICE resolution).
>>>>
>>>> On 30 October 2014 14:55, Carlos Ruiz Díaz <carlos.ruizdiaz at gmail.com>
>>>> wrote:
>>>>
>>>>> rtpengine doesn't provide any mean to do any kind of decryption. The
>>>>> keys, however, are easily accessible if you are willing to modify the
>>>>> original software to create such functionality.
>>>>>
>>>>> Regards,
>>>>> Carlos
>>>>>
>>>>> On Thu, Oct 30, 2014 at 10:47 AM, Anthony Minessale <
>>>>> anthony.minessale at gmail.com> wrote:
>>>>>
>>>>>> This is a philosophical debate as to weather or not making the key
>>>>>> available somewhere it can be obtained from nullifies the intended security.
>>>>>>
>>>>>>
>>>>>> On Thu, Oct 30, 2014 at 5:33 AM, Ben Langfeld <ben at langfeld.co.uk>
>>>>>> wrote:
>>>>>>
>>>>>>> Look into rtpengine and perhaps Kamailio to control it.
>>>>>>>
>>>>>>> On 30 October 2014 04:41, Varghese Paul <varghesepaul87 at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hi all,
>>>>>>>>
>>>>>>>> We are using freeswitch for handling webrtc calls and the
>>>>>>>> negotiation in DTLS mode.
>>>>>>>>
>>>>>>>> We are looking for a tool to decrypt the traffic between the webrtc
>>>>>>>> client and freeswitch server. I know there is already a tool pcaputils from
>>>>>>>> PJSIP for decrypting the SRTP traffic. Since we are using in DTLS mode we
>>>>>>>> can't use this.
>>>>>>>>
>>>>>>>> Can any one suggest any tool/method to decrypt the webrtc audio?
>>>>>>>>
>>>>>>>> Regards
>>>>>>>>
>>>>>>>> Varghese Paul
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> _________________________________________________________________________
>>>>>>>> Professional FreeSWITCH Consulting Services:
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>>>>>>>>
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>>>>>>>>
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>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _________________________________________________________________________
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>>>>>>>
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>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>>>>>>
>>>>>> ☞ http://freeswitch.org/  ☞ http://cluecon.com/  ☞
>>>>>> http://twitter.com/FreeSWITCH
>>>>>> ☞ irc.freenode.net #freeswitch ☞ *http://freeswitch.org/g+
>>>>>> <http://freeswitch.org/g+>*
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>>>>>>
>>>>>>
>>>>>>
>>>>>> _________________________________________________________________________
>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>> consulting at freeswitch.org
>>>>>> http://www.freeswitchsolutions.com
>>>>>>
>>>>>> Official FreeSWITCH Sites
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>>>>>> http://www.cluecon.com
>>>>>>
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>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Carlos
>>>>> http://caruizdiaz.com
>>>>>
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
>>>>> consulting at freeswitch.org
>>>>> http://www.freeswitchsolutions.com
>>>>>
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>>>>>
>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
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>>>> http://www.freeswitchsolutions.com
>>>>
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>>>
>>>
>>>
>>> --
>>> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>>>
>>> ☞ http://freeswitch.org/  ☞ http://cluecon.com/  ☞
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>>>
>>>
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>>>
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>>
>>
>
> --
> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>
> ☞ http://freeswitch.org/  ☞ http://cluecon.com/  ☞
> http://twitter.com/FreeSWITCH
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>
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>
>
>
> _________________________________________________________________________
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>
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>
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