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emacs: mua: check for misplaced secure mml tags

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Emacs message-send seems to ignore a secure mml tag anywhere except at
the start of the body, and it must be followed by a newline. Since
this is almost certainly not desired we check for it, and require user
confirmation before sending.

As the setup before message-send or message-send-and-exit is getting
more complicated it is convenient to unify the two correspoinding
notmuch functions.
This commit is contained in:
Mark Walters 2016-10-08 21:05:23 +01:00 committed by David Bremner
parent 025bf3cd4a
commit 9259c7971d
1 changed files with 48 additions and 4 deletions
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46
emacs/notmuch-mua.el
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@ -490,12 +490,56 @@ will be addressed to all recipients of the source message."
(notmuch-mua-reply query-string sender reply-all)
(deactivate-mark)))
(defun notmuch-mua-check-no-misplaced-secure-tag ()
"Query user if there is a misplaced secure mml tag.
Emacs message-send will (probably) ignore a secure mml tag unless
it is at the start of the body. Returns t if there is no such
tag, or the user confirms they mean it."
(save-excursion
(let ((body-start (progn (message-goto-body) (point))))
(goto-char (point-max))
(or
;; We are always fine if there is no secure tag.
(not (search-backward "<#secure" nil 't))
;; There is a secure tag, so it must be at the start of the
;; body, with no secure tag earlier (i.e., in the headers).
(and (= (point) body-start)
(not (search-backward "<#secure" nil 't)))
;; The user confirms they means it.
(yes-or-no-p "\
There is a <#secure> tag not at the start of the body. It is
likely that the message will be sent unsigned and unencrypted.
Really send? ")))))
(defun notmuch-mua-check-secure-tag-has-newline ()
"Query if the secure mml tag has a newline following it.
Emacs message-send will (probably) ignore a correctly placed
secure mml tag unless it is followed by a newline. Returns t if
any secure tag is followed by a newline, or the user confirms
they mean it."
(save-excursion
(message-goto-body)
(or
;; There is no (correctly placed) secure tag.
(not (looking-at "<#secure"))
;; The secure tag is followed by a newline.
(looking-at "<#secure[^\n>]*>\n")
;; The user confirms they means it.
(yes-or-no-p "\
The <#secure> tag at the start of the body is not followed by a
newline. It is likely that the message will be sent unsigned and
unencrypted. Really send? "))))
(defun notmuch-mua-send-common (arg &optional exit)
(interactive "P")
(when (and (notmuch-mua-check-no-misplaced-secure-tag)
(notmuch-mua-check-secure-tag-has-newline))
(letf (((symbol-function 'message-do-fcc) #'notmuch-maildir-message-do-fcc))
(if exit
(message-send-and-exit arg)
(message-send arg))))
(message-send arg)))))
(defun notmuch-mua-send-and-exit (&optional arg)
(interactive "P")