Bug 3430

Summary: The PGP/MIME plugin cannot decrypt messages broken by Microsoft Exchange
Product: Claws Mail (GTK 2) Reporter: Ramón Cahenzli <rca>
Component: Plugins/Privacy/PGPAssignee: users
Status: NEW ---    
Severity: enhancement    
Priority: P3    
Version: 3.12.0   
Hardware: All   
OS: All   

Description Ramón Cahenzli 2015-05-21 16:46:06 UTC 
The PGP/MIME plugin gets (rightfully) confused when it encounters a PGP/MIME message that was broken by Microsoft Exchange. The problem in the server is well-known since 2008 [1].

The Enigmail team handles this issue by detecting whether it's looking at such a broken message and decrypting the correct part. It even offers to repair the message for the user, so that it gets stored in a proper fashion. The code for detecting is in Enigmail's enigmailConvert.jsm [2].

Maybe the PGP/MIME plugin could be extended to show the same behavior? I would start myself, but my last contact with C was in 1996 and I surely won't let that anywhere near privacy-related code :)


[1] https://social.technet.microsoft.com/Forums/en-US/0f90b1be-6e7e-4658-b577-2bcfec02f7c9/exchange-2007-messes-up-pgp-encrypted-messages?forum=exchangesvrsecuremessaginglegacy

[2] http://sourceforge.net/p/enigmail/source/ci/master/tree/package/enigmailConvert.jsm