[Bug 791539] New: rtspsrc – When username and password authentication is enabled on the server, authorization block in the RTSP message is not updated correctly.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791539

            Bug ID: 791539
           Summary: rtspsrc – When username and password authentication is
                    enabled on the server, authorization block in the RTSP
                    message is not updated correctly.
    Classification: Platform
           Product: GStreamer
           Version: 1.10.4
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: iotanormal at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Every ~2 minutes AXIS encoder expires nonce used for “digest” authentication. 
If an RTSP message, such as “Play/Pause” is received after expiration, an
“Unauthorized” response with a new nonce is replied.   Gstreamer re-sends the
message with a new “Authorization” appended at the end of old “Authorization”
block, instead of replacing the old one.  The server rejects the request
message again and a new nonce is issued in the reply.  The same cycle continues
for 7 more times (total of 9 tries).  Each time the “Authorization” list in the
message is growing.  After the 9th try, Gstreamer generates the following bus
errors:
    [rtspsrc] Not authorized to access resource.
    [rtspsrc] Could not write to resource.

If a heartbeat message happened to be sent instead of the “Play” or “Pause,”
the authorization block is replaced correctly on the next try and connection
stays alive.

Here is a test case that generates the error condition:

Time(sec)    Action/Events
0        Play
45        Pause <-this resets the heartbeat cycle to open up a window for
testing bus error later
100         heartbeat
120        Digest authentication times out at this point.  Next rtsp message
will update nonce
155        heartbeat  <-  nonce gets updated.  Digest authentication timeout is
reset
210        heartbeat
265        heartbeat
275        120 seconds from last nonce update.  Digest authentication times out
at this point
(285-310)      sending “Play” within this period will safely cause a bus error
320        next scheduled heartbeat

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