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

[JoshE (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-22961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=218537#comment-218537 ] 

JoshE commented on ASTERISK-22961:
----------------------------------

The backtrace I attached to this ticket as backtrace (1).txt shows the crash scenario I observed, and I observed it frequently enough to believe it's probably real, at least for the traffic pattern on this particular box.  The setup I have is a mixture of inbound and outbound WebRTC and standard SIP/UDP and SIP/TCP calls on a box.  Call leg count is typically 100 or more.

Not sure what you all were doing with volume or if the mixture of traffic on the box is different, but it seems to occur for me with this patch set included.

> [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, 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'



--
This message was sent by Atlassian JIRA
(v6.2#6252)