[asterisk-dev] [Code Review] SRTP support for Asterisk

[David Vossel]

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Some IAX2 comments.


/trunk/channels/chan_iax2.c
<https://reviewboard.asterisk.org/r/191/#comment4397>

    I'm not sure why this is necessary.  It should be impossible for this condition to ever happen.   cai.encmethods is set to the iax2_encryption variable, and iax2_encryption is guaranteed to be set if the IAX_FORCE_ENCRYPT flag is set.



/trunk/channels/chan_iax2.c
<https://reviewboard.asterisk.org/r/191/#comment4398>

    If the IAX_FORCE_ENCRYPT flag is being set here, then it seems like the iaxs[callno]->encmethods should be verified to be set here as well, otherwise it would be possible to have IAX_FORCE_ENCRYPT set with no possible encryption methods for the iax_pvt.... Use the get_encrypt_methods() function to set the encmethods.



/trunk/channels/chan_iax2.c
<https://reviewboard.asterisk.org/r/191/#comment4399>

    I'm not sure if this matters or not, but it is possible for the pvt->encmethods to be set but encryption to not be used for the call.  Unless the IAX_FORCE_ENCRYPT flag is set, encryption only occurs if both sides of the call support it.


- David


On 2010-05-04 20:07:15, Terry Wilson wrote:
> 
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> https://reviewboard.asterisk.org/r/191/
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> (Updated 2010-05-04 20:07:15)
> 
> 
> Review request for Asterisk Developers.
> 
> 
> Summary
> -------
> 
> SRTP support for Asterisk using Sdescriptions. This has been sitting around for a while, so I figured that it should at least get some review.  Full description of setup at http://lists.digium.com/pipermail/asterisk-dev/2009-January/036029.html
> 
> 
> This addresses bug 5413.
>     https://issues.asterisk.org/view.php?id=5413
> 
> 
> Diffs
> -----
> 
>   /trunk/CHANGES 259665 
>   /trunk/build_tools/menuselect-deps.in 259665 
>   /trunk/channels/chan_iax2.c 259665 
>   /trunk/channels/chan_sip.c 259665 
>   /trunk/channels/sip/dialplan_functions.c 259665 
>   /trunk/channels/sip/include/sdp_crypto.h PRE-CREATION 
>   /trunk/channels/sip/include/sip.h 259665 
>   /trunk/channels/sip/include/srtp.h PRE-CREATION 
>   /trunk/channels/sip/sdp_crypto.c PRE-CREATION 
>   /trunk/channels/sip/srtp.c PRE-CREATION 
>   /trunk/configure UNKNOWN 
>   /trunk/configure.ac 259665 
>   /trunk/funcs/func_channel.c 259665 
>   /trunk/include/asterisk/autoconfig.h.in 259665 
>   /trunk/include/asterisk/frame.h 259665 
>   /trunk/include/asterisk/global_datastores.h 259665 
>   /trunk/include/asterisk/res_srtp.h PRE-CREATION 
>   /trunk/include/asterisk/rtp_engine.h 259665 
>   /trunk/main/asterisk.exports.in 259665 
>   /trunk/main/channel.c 259665 
>   /trunk/main/global_datastores.c 259665 
>   /trunk/main/rtp_engine.c 259665 
>   /trunk/makeopts.in 259665 
>   /trunk/res/res_rtp_asterisk.c 259665 
>   /trunk/res/res_srtp.c PRE-CREATION 
>   /trunk/res/res_srtp.exports.in PRE-CREATION 
> 
> Diff: https://reviewboard.asterisk.org/r/191/diff
> 
> 
> Testing
> -------
> 
> 4 external tests written covering:
> Running with res_srtp noloaded to emulate a user not having libsrtp installed (to make sure we don't accidentally rely on SRTP support)
> Making a call with a user with encrypted=yes when libsrtp support is not enabled fails
> Making a call with encrypted=yes when libsrtp present results in an encrypted call (which also tests the CHANNEL(secure_media) function
> Using CHANNEL(secure_bridge_media) results in the outgoing call attempting to use encryption
> 
> In addition, I have tested a Polycom VVX-1500 to ensure that video + audio SRTP works.
> 
> 
> Thanks,
> 
> Terry
> 
>