[asterisk-bugs] [JIRA] (ASTERISK-22961) [patch] DTLS-SRTP not working with SHA-256

[NITESH BANSAL (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-22961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=213747#comment-213747 ] 

NITESH BANSAL commented on ASTERISK-22961:
------------------------------------------

Hi Jay,

I have written the patch only for Asterisk 11.4, i did not get the chance to try it with other Asterisk versions.
Regarding the JS hack, well i am using JSSIP library to build my webrtc app.
But it should be very straight forward for you to do this.
Search for the function createOffer() in your JS code, there is a callback function passed to it for successful completion. You could use that callback function 
to access the SDP and overwrite it. SDP is accessible in RTCPeerConnection.localDescription.sdp

Regards,
Nitesh Bansal
                
> [patch] DTLS-SRTP not working with SHA-256
> ------------------------------------------
>
>                 Key: ASTERISK-22961
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22961
>             Project: Asterisk
>          Issue Type: Improvement
>      Security Level: None
>          Components: Channels/chan_sip/SRTP, Channels/chan_sip/WebSocket
>    Affects Versions: 11.6.0, 12.0.0-beta2
>            Reporter: Jay Jideliov
>         Attachments: 11.7 patched.zip, asterisk_dtls.patch, chan_sip.c, ice_session.c, res_rtp_asterisk.c, res_rtp_asterisk.c, srtp_dtls.patch
>
>
> Recently it became possible to use websocket on asterisk without a proxy previously necessary to make calls from the web browser. Although partial support has been added, full browser cross-operability has not been achieved yet. However, it seems to be a relatively easy task.
> Tested on Chrome+SIPML5+Asterisk 11, the connection can be established and works fine. However, due to the fact that Firefox sends SHA-256 packets which are not supported by asterisk, hence the support for this browser is limited by this issue.
> Step 1: Adding certificates to support DTLS
> dtlsenable = yes
> dtlsverify = no
> dtlscertfile=/etc/asterisk/keys/softphone.pem
> dtlsprivatekey=/etc/asterisk/keys/key.pem
> dtlscafile=/etc/asterisk/keys/key.pem
> Step 2: Making a call
> [Nov 25 15:05:50] WARNING[5628][C-0000005c]: chan_sip.c:11034 process_sdp_a_dtls: Unsupported fingerprint hash type 'sha-2' received on dialog '38f43a1f-15cd-ad69-c2b3-72c21b9de5fd'

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