[PATCH v6 2/3] emacs: quote MML tags in replies

[Pieter Praet]

From: Aaron Ecay <aaronecay at gmail.com>

Emacs message-mode uses certain text strings to indicate how to attach
files to outgoing mail.  If these are present in the text of an email,
and a user is tricked into replying to the message, the user’s files
could be exposed.

Edited-by: Pieter Praet <pieter at praet.org>:  Rebased to release branch.
---
 NEWS                 |   11 +++++++++++
 emacs/notmuch-mua.el |    7 ++++++-
 test/emacs           |    1 -
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/NEWS b/NEWS
index 3d2c2a8..a089e67 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,17 @@ Fix error handling in python bindings.
   exceptions to indicate the error condition. Any subsequent calls
   into libnotmuch caused segmentation faults.
 
+Quote MML tags in replies
+
+  MML tags are text codes that Emacs uses to indicate attachments
+  (among other things) in messages being composed.  The Emacs
+  interface did not quote MML tags in the quoted text of a reply.
+  User could be tricked into replying to a maliciously formatted
+  message and not editing out the MML tags from the quoted text.  This
+  could lead to files from the user's machine being attached to the
+  outgoing message.  The Emacs interface now quotes these tags in
+  reply text, so that they do not effect outgoing messages.
+
 
 Notmuch 0.11 (2012-01-13)
 =========================
diff --git a/emacs/notmuch-mua.el b/emacs/notmuch-mua.el
index 7114e48..3e93d7c 100644
--- a/emacs/notmuch-mua.el
+++ b/emacs/notmuch-mua.el
@@ -111,7 +111,12 @@ list."
     (insert body))
   (set-buffer-modified-p nil)
 
-  (message-goto-body))
+  (message-goto-body)
+  ;; Original message may contain (malicious) MML tags.  We must
+  ;; properly quote them in the reply.  Note that using `point-max'
+  ;; instead of `mark' here is wrong.  The buffer may include user's
+  ;; signature which should not be MML-quoted.
+  (mml-quote-region (point) (point-max)))
 
 (defun notmuch-mua-forward-message ()
   (message-forward)
diff --git a/test/emacs b/test/emacs
index db8e4ad..2d066ed 100755
--- a/test/emacs
+++ b/test/emacs
@@ -274,7 +274,6 @@ EOF
 test_expect_equal_file OUTPUT EXPECTED
 
 test_begin_subtest "Quote MML tags in reply"
-test_subtest_known_broken
 message_id='test-emacs-mml-quoting at message.id'
 add_message [id]="$message_id" \
 	    "[subject]='$test_subtest_name'" \
-- 
1.7.8.1