[Bug 350732] [NEW] IAX2 encryption: calls end abrutly due to normal packet loss

[Launchpad Bug Tracker]

You have been subscribed to a public bug by François Marier (fmarier):

Binary package hint: asterisk

As described upstream, IAX2 encryption is broken in the Jaunty version
of asterisk:

  If an iax channel is encrypted, and a retransmit frame is sent, that packet's iseqno
  is updated while it is encrypted. This causes the entire frame to be corrupted. When
  the corrupted frame is sent, the other side decrypts it and sends a VNAK back because
  the decrypted frame doesn't make any sense. When we get the VNAK, we look through the
  sent queue and send the same corrupted frame causing a loop. To fix this, encrypted
  frames requiring retransmission are decrypted, updated, then re-encrypted. Since
  key-rotation may change the key held by the pvt struct, the keys used for
  encryption/decryption are held within the iax_frame to guarantee they remain correct.

This makes it practically impossible to turn IAX2 encryption in most of my calls
because the connection constantly cuts off. So it's a very serious bug for anybody using
encryption with Asterisk.

I have attached a debdiff which applies the upstream patch on the
current Jaunty version.

** Affects: asterisk
     Importance: Unknown
         Status: Unknown

** Affects: asterisk (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: asterisk (Debian)
     Importance: Unknown
         Status: Unknown

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IAX2 encryption: calls end abrutly due to normal packet loss
https://bugs.launchpad.net/bugs/350732
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