573730 - Unable to see/detach .p7m attachments of Content-Type: application/pkcs7-mime

Status: RESOLVED DUPLICATE of bug 243833

(MailNews Core :: MIME, defect)

Description

[logan]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3
Build Identifier: 1.5-3.1RC2

When receiving a .p7m file encrypted by entrust, Thunderbird eats it. we are unable to save the attachment. Thunderbird does not even show the attachment in the attachments window. As we're dealing with sensitive data, the unknown third party solution "Smart P7M Support" is not an option. I have confirmed the bug in my own office from versions 2.0.0.23 through 3.1RC2, and the linked bug report for mailnews core dates it back to 2004. I've saved some headers.

From: [redacted]
Organization: [redacted]
User-Agent: Thunderbird 2.0.0.23 (Windows/20090812)
MIME-Version: 1.0
To: [redacted]
Subject: [Fwd: Does this email have an attachment?]
Content-Type: multipart/mixed;
 boundary="------------090503070006030307050508"
X-RCPT-TO: [redacted]
Status: R
X-UIDL: 479334550

This is a multi-part message in MIME format.
--------------090503070006030307050508
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit


--------------090503070006030307050508
Content-Type: message/rfc822;
 name="Does this email have an attachment?.eml"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="Does this email have an attachment?.eml"

------_=_NextPart_002_01CB115C.04256859
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Checking to see if this attachment comes to you and you can open it????

=20

[person's name address and phone]

=20

------_=_NextPart_002_01CB115C.04256859--

------_=_NextPart_001_01CB115C.04256859
Content-Type: application/pkcs7-mime;
	name="Sensitive Document.pdf.p7m"
Content-Transfer-Encoding: base64
Content-Description: Sensitive Document.pdf.p7m
Content-Disposition: attachment;
	filename="Sensitive Document.pdf.p7m"
[~1000 lines of gibberish, presumably the encrypted file]

Reproducible: Always

Steps to Reproduce:
1. Use entrust to encrypt file to .p7m
2. Receive file as an attachment in Thunderbird
Actual Results:  
The attachment was not retrievable except by forwarding to someone running outlook or the use of an unknown third party attachment located at https://nic-nac-project.org/~kaosmos/p7mHandler-en.html

Expected Results:  
The ability to save the .p7m file to desktop.

Comment 1

[[:Aureliano Buendía]]

Bug #243833 is New: dhy do you have open a duplicate?

Comment 2

[intendentedelleacque]

I am the "unknown third part" (i.e. the developer of the extension): I understand your doubts, but the code of the extension is totally open and readable by everyone, so you can trust it at 100%