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

[Thomas Guebels (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-22961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=218442#comment-218442 ] 

Thomas Guebels commented on ASTERISK-22961:
-------------------------------------------

For me the dtls-srtp patch works great on asterisk 11, for outbound calls in Firefox 28 or Chrome 35.
I just had to make a small change to allow inbound calls, from asterisk to the browsers: no a=fingerprint line was sent in the SDP of the INVITE from asterisk.

However, since Firefox 29 it seems DTLS is broken again:
{noformat}
     -- [RTCP] Received a DTLS message
     -- [RTCP]   >> >> writing 15 bytes on read_BIO (to have it read later)
     -- [RTCP]   >> >> >> actually wrote 15 bytes (should NOT retry)
     -- dtls_info_callback: read, where=16388, ret=554
     --   >> 3RFINA, F, BC
     -- [RTCP]  >> >> read -1 bytes from SSL
     -- [RTP]   >> Still waiting for the DTLS handshake to complete, discarding packet (172)
     -- [RTP] Received a DTLS message
     -- [RTP]   >> >> writing 15 bytes on read_BIO (to have it read later)
     -- [RTP]   >> >> >> actually wrote 15 bytes (should NOT retry)
     -- dtls_info_callback: read, where=16388, ret=554
     --   >> 3RFINA, F, BC
     -- [RTP]  >> >> read -1 bytes from SSL
res_rtp_asterisk.c: DTLS failure occurred on RTP instance '0xa3da5d4', terminating
{noformat}

> [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, backtrace (1).txt, chan_sip.c, dtls_retransmission.patch, ice_session.c, jssip no ring.txt, res_rtp_asterisk.c, res_rtp_asterisk.c, srtp_dtls.patch, srtp_dtls.patch, wireshark.txt
>
>
> 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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