1 ;;; mml1991.el --- Old PGP message format (RFC 1991) support for MML
3 ;; Copyright (C) 1998-2011 Free Software Foundation, Inc.
5 ;; Author: Sascha Lüdecke <sascha@meta-x.de>,
6 ;; Simon Josefsson <simon@josefsson.org> (Mailcrypt interface, Gnus glue)
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software: you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation, either version 3 of the License, or
14 ;; (at your option) any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
29 ;; For Emacs <22.2 and XEmacs.
30 (unless (fboundp 'declare-function) (defmacro declare-function (&rest r)))
32 (if (locate-library "password-cache")
33 (require 'password-cache)
43 (defvar mc-pgp-always-sign)
45 (autoload 'quoted-printable-decode-region "qp")
46 (autoload 'quoted-printable-encode-region "qp")
48 (autoload 'mm-decode-content-transfer-encoding "mm-bodies")
49 (autoload 'mm-encode-content-transfer-encoding "mm-bodies")
50 (autoload 'message-options-get "message")
51 (autoload 'message-options-set "message")
53 (defvar mml1991-use mml2015-use
54 "The package used for PGP.")
56 (defvar mml1991-function-alist
57 '((mailcrypt mml1991-mailcrypt-sign
58 mml1991-mailcrypt-encrypt)
63 "Alist of PGP functions.")
65 (defvar mml1991-cache-passphrase mml-secure-cache-passphrase
66 "If t, cache passphrase.")
68 (defvar mml1991-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
69 "How many seconds the passphrase is cached.
70 Whether the passphrase is cached at all is controlled by
71 `mml1991-cache-passphrase'.")
73 (defvar mml1991-signers nil
74 "A list of your own key ID which will be used to sign a message.")
76 (defvar mml1991-encrypt-to-self nil
77 "If t, add your own key ID to recipient list when encryption.")
81 (autoload 'mc-sign-generic "mc-toplev")
83 (defvar mml1991-decrypt-function 'mailcrypt-decrypt)
84 (defvar mml1991-verify-function 'mailcrypt-verify)
86 (defun mml1991-mailcrypt-sign (cont)
87 (let ((text (current-buffer))
89 (result-buffer (get-buffer-create "*GPG Result*")))
90 ;; Save MIME Content[^ ]+: headers from signing
91 (goto-char (point-min))
92 (while (looking-at "^Content[^ ]+:") (forward-line))
94 (setq headers (buffer-string))
95 (delete-region (point-min) (point)))
96 (goto-char (point-max))
99 (quoted-printable-decode-region (point-min) (point-max))
101 (setq signature (current-buffer))
102 (insert-buffer-substring text)
103 (unless (mc-sign-generic (message-options-get 'message-sender)
105 (unless (> (point-max) (point-min))
106 (pop-to-buffer result-buffer)
107 (error "Sign error")))
108 (goto-char (point-min))
109 (while (re-search-forward "\r+$" nil t)
110 (replace-match "" t t))
111 (quoted-printable-encode-region (point-min) (point-max))
113 (delete-region (point-min) (point-max))
114 (if headers (insert headers))
116 (insert-buffer-substring signature)
117 (goto-char (point-max)))))
119 (declare-function mc-encrypt-generic "ext:mc-toplev"
120 (&optional recipients scheme start end from sign))
122 (defun mml1991-mailcrypt-encrypt (cont &optional sign)
123 (let ((text (current-buffer))
125 (or mc-pgp-always-sign
127 (eq t (or (message-options-get 'message-sign-encrypt)
129 'message-sign-encrypt
130 (or (y-or-n-p "Sign the message? ")
134 (result-buffer (get-buffer-create "*GPG Result*")))
135 ;; Strip MIME Content[^ ]: headers since it will be ASCII ARMORED
136 (goto-char (point-min))
137 (while (looking-at "^Content[^ ]+:") (forward-line))
139 (delete-region (point-min) (point)))
141 (inline (mm-disable-multibyte))
142 (setq cipher (current-buffer))
143 (insert-buffer-substring text)
144 (unless (mc-encrypt-generic
146 (message-options-get 'message-recipients)
147 (message-options-set 'message-recipients
148 (read-string "Recipients: ")))
150 (point-min) (point-max)
151 (message-options-get 'message-sender)
153 (unless (> (point-max) (point-min))
154 (pop-to-buffer result-buffer)
155 (error "Encrypt error")))
156 (goto-char (point-min))
157 (while (re-search-forward "\r+$" nil t)
158 (replace-match "" t t))
160 (delete-region (point-min) (point-max))
161 ;;(insert "Content-Type: application/pgp-encrypted\n\n")
162 ;;(insert "Version: 1\n\n")
164 (insert-buffer-substring cipher)
165 (goto-char (point-max)))))
169 (autoload 'pgg-sign-region "pgg")
170 (autoload 'pgg-encrypt-region "pgg")
172 (defvar pgg-default-user-id)
173 (defvar pgg-errors-buffer)
174 (defvar pgg-output-buffer)
176 (defun mml1991-pgg-sign (cont)
177 (let ((pgg-text-mode t)
178 (pgg-default-user-id (or (message-options-get 'mml-sender)
179 pgg-default-user-id))
181 ;; Don't sign headers.
182 (goto-char (point-min))
183 (when (re-search-forward "^$" nil t)
184 (setq headers (buffer-substring (point-min) (point)))
186 (narrow-to-region (point-min) (point))
187 (setq cte (mail-fetch-field "content-transfer-encoding")))
189 (delete-region (point-min) (point))
191 (setq cte (intern (downcase cte)))
192 (mm-decode-content-transfer-encoding cte)))
193 (unless (pgg-sign-region (point-min) (point-max) t)
194 (pop-to-buffer pgg-errors-buffer)
195 (error "Encrypt error"))
196 (delete-region (point-min) (point-max))
197 (mm-with-unibyte-current-buffer
198 (insert-buffer-substring pgg-output-buffer)
199 (goto-char (point-min))
200 (while (re-search-forward "\r+$" nil t)
201 (replace-match "" t t))
203 (mm-encode-content-transfer-encoding cte))
204 (goto-char (point-min))
210 (defun mml1991-pgg-encrypt (cont &optional sign)
211 (goto-char (point-min))
212 (when (re-search-forward "^$" nil t)
213 (let ((cte (save-restriction
214 (narrow-to-region (point-min) (point))
215 (mail-fetch-field "content-transfer-encoding"))))
216 ;; Strip MIME headers since it will be ASCII armored.
218 (delete-region (point-min) (point))
220 (mm-decode-content-transfer-encoding (intern (downcase cte))))))
221 (unless (let ((pgg-text-mode t))
223 (point-min) (point-max)
226 (message-options-get 'message-recipients)
227 (message-options-set 'message-recipients
228 (read-string "Recipients: ")))
231 (pop-to-buffer pgg-errors-buffer)
232 (error "Encrypt error"))
233 (delete-region (point-min) (point-max))
235 (insert-buffer-substring pgg-output-buffer)
240 (defvar epg-user-id-alist)
242 (autoload 'epg-make-context "epg")
243 (autoload 'epg-passphrase-callback-function "epg")
244 (autoload 'epa-select-keys "epa")
245 (autoload 'epg-list-keys "epg")
246 (autoload 'epg-context-set-armor "epg")
247 (autoload 'epg-context-set-textmode "epg")
248 (autoload 'epg-context-set-signers "epg")
249 (autoload 'epg-context-set-passphrase-callback "epg")
250 (autoload 'epg-key-sub-key-list "epg")
251 (autoload 'epg-sub-key-capability "epg")
252 (autoload 'epg-sub-key-validity "epg")
253 (autoload 'epg-sub-key-fingerprint "epg")
254 (autoload 'epg-sign-string "epg")
255 (autoload 'epg-encrypt-string "epg")
256 (autoload 'epg-configuration "epg-config")
257 (autoload 'epg-expand-group "epg-config")
259 (defvar mml1991-epg-secret-key-id-list nil)
261 (defun mml1991-epg-passphrase-callback (context key-id ignore)
263 (epg-passphrase-callback-function context key-id nil)
264 (let* ((entry (assoc key-id epg-user-id-alist))
267 (format "GnuPG passphrase for %s: "
275 (let ((password-cache-expiry mml1991-passphrase-cache-expiry))
276 (password-cache-add key-id passphrase))
277 (setq mml1991-epg-secret-key-id-list
278 (cons key-id mml1991-epg-secret-key-id-list))
279 (copy-sequence passphrase)))))
281 (defun mml1991-epg-find-usable-key (keys usage)
284 (let ((pointer (epg-key-sub-key-list (car keys))))
286 (if (and (memq usage (epg-sub-key-capability (car pointer)))
287 (not (memq 'disabled (epg-sub-key-capability (car pointer))))
288 (not (memq (epg-sub-key-validity (car pointer))
289 '(revoked expired))))
290 (throw 'found (car keys)))
291 (setq pointer (cdr pointer))))
292 (setq keys (cdr keys)))))
294 ;; XXX: since gpg --list-secret-keys does not return validity of each
295 ;; key, `mml1991-epg-find-usable-key' defined above is not enough for
296 ;; secret keys. The function `mml1991-epg-find-usable-secret-key'
297 ;; below looks at appropriate public keys to check usability.
298 (defun mml1991-epg-find-usable-secret-key (context name usage)
299 (let ((secret-keys (epg-list-keys context name t))
301 (while (and (not secret-key) secret-keys)
302 (if (mml1991-epg-find-usable-key
303 (epg-list-keys context (epg-sub-key-fingerprint
304 (car (epg-key-sub-key-list
305 (car secret-keys)))))
307 (setq secret-key (car secret-keys)
309 (setq secret-keys (cdr secret-keys))))
312 (defun mml1991-epg-sign (cont)
313 (let ((context (epg-make-context))
314 headers cte signer-key signers signature)
315 (if (eq mm-sign-option 'guided)
316 (setq signers (epa-select-keys context "Select keys for signing.
317 If no one is selected, default secret key is used. "
320 (setq signers (delq nil
324 (mml1991-epg-find-usable-secret-key
326 (unless (or signer-key
329 "No secret key for %s; skip it? "
331 (error "No secret key for %s" name))
334 (epg-context-set-armor context t)
335 (epg-context-set-textmode context t)
336 (epg-context-set-signers context signers)
337 (if mml1991-cache-passphrase
338 (epg-context-set-passphrase-callback
340 #'mml1991-epg-passphrase-callback))
341 ;; Don't sign headers.
342 (goto-char (point-min))
343 (when (re-search-forward "^$" nil t)
344 (setq headers (buffer-substring (point-min) (point)))
346 (narrow-to-region (point-min) (point))
347 (setq cte (mail-fetch-field "content-transfer-encoding")))
349 (delete-region (point-min) (point))
351 (setq cte (intern (downcase cte)))
352 (mm-decode-content-transfer-encoding cte)))
353 (condition-case error
354 (setq signature (epg-sign-string context (buffer-string) 'clear)
355 mml1991-epg-secret-key-id-list nil)
357 (while mml1991-epg-secret-key-id-list
358 (password-cache-remove (car mml1991-epg-secret-key-id-list))
359 (setq mml1991-epg-secret-key-id-list
360 (cdr mml1991-epg-secret-key-id-list)))
361 (signal (car error) (cdr error))))
362 (delete-region (point-min) (point-max))
363 (mm-with-unibyte-current-buffer
365 (goto-char (point-min))
366 (while (re-search-forward "\r+$" nil t)
367 (replace-match "" t t))
369 (mm-encode-content-transfer-encoding cte))
370 (goto-char (point-min))
376 (defun mml1991-epg-encrypt (cont &optional sign)
377 (goto-char (point-min))
378 (when (re-search-forward "^$" nil t)
379 (let ((cte (save-restriction
380 (narrow-to-region (point-min) (point))
381 (mail-fetch-field "content-transfer-encoding"))))
382 ;; Strip MIME headers since it will be ASCII armored.
384 (delete-region (point-min) (point))
386 (mm-decode-content-transfer-encoding (intern (downcase cte))))))
387 (let ((context (epg-make-context))
389 (if (message-options-get 'message-recipients)
391 (message-options-get 'message-recipients)
393 recipient-key signer-key cipher signers config)
394 (when mml1991-encrypt-to-self
395 (unless mml1991-signers
396 (error "mml1991-signers is not set"))
397 (setq recipients (nconc recipients mml1991-signers)))
398 ;; We should remove this check if epg-0.0.6 is released.
399 (if (and (condition-case nil
400 (require 'epg-config)
402 (functionp #'epg-expand-group))
403 (setq config (epg-configuration)
406 (mapcar (lambda (recipient)
407 (or (epg-expand-group config recipient)
410 (if (eq mm-encrypt-option 'guided)
412 (epa-select-keys context "Select recipients for encryption.
413 If no one is selected, symmetric encryption will be performed. "
418 (setq recipient-key (mml1991-epg-find-usable-key
419 (epg-list-keys context name)
421 (unless (or recipient-key
423 (format "No public key for %s; skip it? "
425 (error "No public key for %s" name))
429 (error "No recipient specified")))
431 (if (eq mm-sign-option 'guided)
432 (setq signers (epa-select-keys context "Select keys for signing.
433 If no one is selected, default secret key is used. "
436 (setq signers (delq nil
439 (mml1991-epg-find-usable-secret-key
442 (epg-context-set-signers context signers))
443 (epg-context-set-armor context t)
444 (epg-context-set-textmode context t)
445 (if mml1991-cache-passphrase
446 (epg-context-set-passphrase-callback
448 #'mml1991-epg-passphrase-callback))
449 (condition-case error
451 (epg-encrypt-string context (buffer-string) recipients sign)
452 mml1991-epg-secret-key-id-list nil)
454 (while mml1991-epg-secret-key-id-list
455 (password-cache-remove (car mml1991-epg-secret-key-id-list))
456 (setq mml1991-epg-secret-key-id-list
457 (cdr mml1991-epg-secret-key-id-list)))
458 (signal (car error) (cdr error))))
459 (delete-region (point-min) (point-max))
460 (insert "\n" cipher))
464 (defun mml1991-encrypt (cont &optional sign)
465 (let ((func (nth 2 (assq mml1991-use mml1991-function-alist))))
467 (funcall func cont sign)
468 (error "Cannot find encrypt function"))))
471 (defun mml1991-sign (cont)
472 (let ((func (nth 1 (assq mml1991-use mml1991-function-alist))))
475 (error "Cannot find sign function"))))
480 ;; coding: iso-8859-1
483 ;;; mml1991.el ends here