1 ;;; mml2015.el --- MIME Security with Pretty Good Privacy (PGP)
3 ;; Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
4 ;; 2008, 2009, 2010 Free Software Foundation, Inc.
6 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
7 ;; Keywords: PGP MIME MML
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/>.
26 ;; RFC 2015 is updated by RFC 3156, this file should be compatible
33 (unless (fboundp 'declare-function) (defmacro declare-function (&rest r)))
35 (if (locate-library "password-cache")
36 (require 'password-cache)
39 (eval-when-compile (require 'cl))
45 (defvar mc-pgp-always-sign)
47 (declare-function epg-check-configuration "ext:epg-config"
48 (config &optional minimum-version))
49 (declare-function epg-configuration "ext:epg-config" ())
51 (defvar mml2015-use (or
55 (epg-check-configuration (epg-configuration))
60 ;; Avoid the "Recursive load suspected" error
62 (let ((recursive-load-depth-limit 100))
64 (and (fboundp 'pgg-sign-region)
69 (and (fboundp 'gpg-sign-detached)
73 (and (fboundp 'mc-encrypt-generic)
74 (fboundp 'mc-sign-generic)
75 (fboundp 'mc-cleanup-recipient-headers)
77 "The package used for PGP/MIME.
78 Valid packages include `epg', `pgg', `gpg' and `mailcrypt'.")
80 ;; Something is not RFC2015.
81 (defvar mml2015-function-alist
82 '((mailcrypt mml2015-mailcrypt-sign
83 mml2015-mailcrypt-encrypt
84 mml2015-mailcrypt-verify
85 mml2015-mailcrypt-decrypt
86 mml2015-mailcrypt-clear-verify
87 mml2015-mailcrypt-clear-decrypt)
92 mml2015-gpg-clear-verify
93 mml2015-gpg-clear-decrypt)
98 mml2015-pgg-clear-verify
99 mml2015-pgg-clear-decrypt)
100 (epg mml2015-epg-sign
104 mml2015-epg-clear-verify
105 mml2015-epg-clear-decrypt))
106 "Alist of PGP/MIME functions.")
108 (defvar mml2015-result-buffer nil)
110 (defcustom mml2015-unabbrev-trust-alist
111 '(("TRUST_UNDEFINED" . nil)
112 ("TRUST_NEVER" . nil)
113 ("TRUST_MARGINAL" . t)
115 ("TRUST_ULTIMATE" . t))
116 "Map GnuPG trust output values to a boolean saying if you trust the key."
118 :group 'mime-security
119 :type '(repeat (cons (regexp :tag "GnuPG output regexp")
120 (boolean :tag "Trust key"))))
122 (defcustom mml2015-verbose mml-secure-verbose
123 "If non-nil, ask the user about the current operation more verbosely."
124 :group 'mime-security
127 (defcustom mml2015-cache-passphrase mml-secure-cache-passphrase
128 "If t, cache passphrase."
129 :group 'mime-security
132 (defcustom mml2015-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
133 "How many seconds the passphrase is cached.
134 Whether the passphrase is cached at all is controlled by
135 `mml2015-cache-passphrase'."
136 :group 'mime-security
139 (defcustom mml2015-signers nil
140 "A list of your own key ID which will be used to sign a message."
141 :group 'mime-security
142 :type '(repeat (string :tag "Key ID")))
144 (defcustom mml2015-encrypt-to-self nil
145 "If t, add your own key ID to recipient list when encryption."
146 :group 'mime-security
149 (defcustom mml2015-always-trust t
150 "If t, GnuPG skip key validation on encryption."
151 :group 'mime-security
154 ;; Extract plaintext from cleartext signature. IMO, this kind of task
155 ;; should be done by GnuPG rather than Elisp, but older PGP backends
156 ;; (such as Mailcrypt, PGG, and gpg.el) discard the output from GnuPG.
157 (defun mml2015-extract-cleartext-signature ()
159 ;; <54a15d860801080142l70b95d7dkac4bf51a86196011@mail.gmail.com>: ``I still
160 ;; believe that the right way is to use the plaintext output from GnuPG as
161 ;; it is, and mml2015-extract-cleartext-signature is just a kludge for
162 ;; misdesigned libraries like PGG, which have no ability to do that. So, I
163 ;; think it should not have descriptive documentation.''
165 ;; This function doesn't handle NotDashEscaped correctly. EasyPG handles it
167 ;; http://thread.gmane.org/gmane.emacs.gnus.general/66062/focus=66082
168 ;; http://thread.gmane.org/gmane.emacs.gnus.general/65087/focus=65109
169 (goto-char (point-min))
171 ;; We need to be careful not to strip beyond the armor headers.
172 ;; Previously, an attacker could replace the text inside our
173 ;; markup with trailing garbage by injecting whitespace into the
175 (while (looking-at "Hash:") ; The only header allowed in cleartext
176 (forward-line)) ; signatures according to RFC2440.
177 (when (looking-at "[\t ]*$")
179 (delete-region (point-min) (point))
180 (if (re-search-forward "^-----BEGIN PGP SIGNATURE-----" nil t)
181 (delete-region (match-beginning 0) (point-max)))
182 (goto-char (point-min))
183 (while (re-search-forward "^- " nil t)
184 (replace-match "" t t)
187 ;;; mailcrypt wrapper
189 (autoload 'mailcrypt-decrypt "mailcrypt")
190 (autoload 'mailcrypt-verify "mailcrypt")
191 (autoload 'mc-pgp-always-sign "mailcrypt")
192 (autoload 'mc-encrypt-generic "mc-toplev")
193 (autoload 'mc-cleanup-recipient-headers "mc-toplev")
194 (autoload 'mc-sign-generic "mc-toplev")
196 (defvar mc-default-scheme)
199 (defvar mml2015-decrypt-function 'mailcrypt-decrypt)
200 (defvar mml2015-verify-function 'mailcrypt-verify)
202 (defun mml2015-format-error (err)
203 (if (stringp (cadr err))
205 (format "%S" (cdr err))))
207 (defun mml2015-mailcrypt-decrypt (handle ctl)
209 (let (child handles result)
210 (unless (setq child (mm-find-part-by-type
212 "application/octet-stream" nil t))
213 (mm-set-handle-multipart-parameter
214 mm-security-handle 'gnus-info "Corrupted")
215 (throw 'error handle))
217 (mm-insert-part child)
220 (funcall mml2015-decrypt-function)
222 (mm-set-handle-multipart-parameter
223 mm-security-handle 'gnus-details (mml2015-format-error err))
226 (mm-set-handle-multipart-parameter
227 mm-security-handle 'gnus-details "Quit.")
230 (mm-set-handle-multipart-parameter
231 mm-security-handle 'gnus-info "Failed")
232 (throw 'error handle))
233 (setq handles (mm-dissect-buffer t)))
234 (mm-destroy-parts handle)
235 (mm-set-handle-multipart-parameter
236 mm-security-handle 'gnus-info
238 (let ((sig (with-current-buffer mml2015-result-buffer
239 (mml2015-gpg-extract-signature-details))))
240 (concat ", Signer: " sig))))
241 (if (listp (car handles))
245 (defun mml2015-mailcrypt-clear-decrypt ()
249 (funcall mml2015-decrypt-function)
251 (mm-set-handle-multipart-parameter
252 mm-security-handle 'gnus-details (mml2015-format-error err))
255 (mm-set-handle-multipart-parameter
256 mm-security-handle 'gnus-details "Quit.")
259 (mm-set-handle-multipart-parameter
260 mm-security-handle 'gnus-info "OK")
261 (mm-set-handle-multipart-parameter
262 mm-security-handle 'gnus-info "Failed"))))
264 (defun mml2015-fix-micalg (alg)
266 ;; Mutt/1.2.5i has seen sending micalg=php-sha1
267 (upcase (if (string-match "^p[gh]p-" alg)
268 (substring alg (match-end 0))
271 (defun mml2015-mailcrypt-verify (handle ctl)
274 (unless (setq part (mm-find-raw-part-by-type
275 ctl (or (mm-handle-multipart-ctl-parameter
277 "application/pgp-signature")
279 (mm-set-handle-multipart-parameter
280 mm-security-handle 'gnus-info "Corrupted")
281 (throw 'error handle))
283 (insert "-----BEGIN PGP SIGNED MESSAGE-----\n")
284 (insert (format "Hash: %s\n\n"
285 (or (mml2015-fix-micalg
286 (mm-handle-multipart-ctl-parameter
290 (narrow-to-region (point) (point))
292 (goto-char (point-min))
294 (if (looking-at "^-")
297 (unless (setq part (mm-find-part-by-type
298 (cdr handle) "application/pgp-signature" nil t))
299 (mm-set-handle-multipart-parameter
300 mm-security-handle 'gnus-info "Corrupted")
301 (throw 'error handle))
303 (narrow-to-region (point) (point))
304 (mm-insert-part part)
305 (goto-char (point-min))
306 (if (re-search-forward "^-----BEGIN PGP [^-]+-----\r?$" nil t)
307 (replace-match "-----BEGIN PGP SIGNATURE-----" t t))
308 (if (re-search-forward "^-----END PGP [^-]+-----\r?$" nil t)
309 (replace-match "-----END PGP SIGNATURE-----" t t)))
310 (let ((mc-gpg-debug-buffer (get-buffer-create " *gnus gpg debug*")))
311 (unless (condition-case err
313 (funcall mml2015-verify-function)
314 (if (get-buffer " *mailcrypt stderr temp")
315 (mm-set-handle-multipart-parameter
316 mm-security-handle 'gnus-details
317 (with-current-buffer " *mailcrypt stderr temp"
319 (if (get-buffer " *mailcrypt stdout temp")
320 (kill-buffer " *mailcrypt stdout temp"))
321 (if (get-buffer " *mailcrypt stderr temp")
322 (kill-buffer " *mailcrypt stderr temp"))
323 (if (get-buffer " *mailcrypt status temp")
324 (kill-buffer " *mailcrypt status temp"))
325 (if (get-buffer mc-gpg-debug-buffer)
326 (kill-buffer mc-gpg-debug-buffer)))
328 (mm-set-handle-multipart-parameter
329 mm-security-handle 'gnus-details (mml2015-format-error err))
332 (mm-set-handle-multipart-parameter
333 mm-security-handle 'gnus-details "Quit.")
335 (mm-set-handle-multipart-parameter
336 mm-security-handle 'gnus-info "Failed")
337 (throw 'error handle))))
338 (mm-set-handle-multipart-parameter
339 mm-security-handle 'gnus-info "OK")
342 (defun mml2015-mailcrypt-clear-verify ()
343 (let ((mc-gpg-debug-buffer (get-buffer-create " *gnus gpg debug*")))
344 (if (condition-case err
346 (funcall mml2015-verify-function)
347 (if (get-buffer " *mailcrypt stderr temp")
348 (mm-set-handle-multipart-parameter
349 mm-security-handle 'gnus-details
350 (with-current-buffer " *mailcrypt stderr temp"
352 (if (get-buffer " *mailcrypt stdout temp")
353 (kill-buffer " *mailcrypt stdout temp"))
354 (if (get-buffer " *mailcrypt stderr temp")
355 (kill-buffer " *mailcrypt stderr temp"))
356 (if (get-buffer " *mailcrypt status temp")
357 (kill-buffer " *mailcrypt status temp"))
358 (if (get-buffer mc-gpg-debug-buffer)
359 (kill-buffer mc-gpg-debug-buffer)))
361 (mm-set-handle-multipart-parameter
362 mm-security-handle 'gnus-details (mml2015-format-error err))
365 (mm-set-handle-multipart-parameter
366 mm-security-handle 'gnus-details "Quit.")
368 (mm-set-handle-multipart-parameter
369 mm-security-handle 'gnus-info "OK")
370 (mm-set-handle-multipart-parameter
371 mm-security-handle 'gnus-info "Failed")))
372 (mml2015-extract-cleartext-signature))
374 (defun mml2015-mailcrypt-sign (cont)
375 (mc-sign-generic (message-options-get 'message-sender)
377 (let ((boundary (mml-compute-boundary cont))
379 (goto-char (point-min))
380 (unless (re-search-forward "^-----BEGIN PGP SIGNED MESSAGE-----\r?$" nil t)
381 (error "Cannot find signed begin line"))
382 (goto-char (match-beginning 0))
384 (unless (looking-at "Hash:[ \t]*\\([a-zA-Z0-9]+\\)")
385 (error "Cannot not find PGP hash"))
386 (setq hash (match-string 1))
387 (unless (re-search-forward "^$" nil t)
388 (error "Cannot not find PGP message"))
390 (delete-region (point-min) (point))
391 (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
393 (insert (format "\tmicalg=pgp-%s; protocol=\"application/pgp-signature\"\n"
395 (insert (format "\n--%s\n" boundary))
397 (goto-char (point-max))
398 (unless (re-search-backward "^-----END PGP SIGNATURE-----\r?$" nil t)
399 (error "Cannot find signature part"))
400 (replace-match "-----END PGP MESSAGE-----" t t)
401 (goto-char (match-beginning 0))
402 (unless (re-search-backward "^-----BEGIN PGP SIGNATURE-----\r?$"
404 (error "Cannot find signature part"))
405 (replace-match "-----BEGIN PGP MESSAGE-----" t t)
406 (goto-char (match-beginning 0))
408 (narrow-to-region point (point))
410 (while (re-search-forward "^- -" nil t)
411 (replace-match "-" t t))
412 (goto-char (point-max)))
413 (insert (format "--%s\n" boundary))
414 (insert "Content-Type: application/pgp-signature\n\n")
415 (goto-char (point-max))
416 (insert (format "--%s--\n" boundary))
417 (goto-char (point-max))))
419 ;; We require mm-decode, which requires mm-bodies, which autoloads
420 ;; message-options-get (!).
421 (declare-function message-options-set "message" (symbol value))
423 (defun mml2015-mailcrypt-encrypt (cont &optional sign)
424 (let ((mc-pgp-always-sign
425 (or mc-pgp-always-sign
427 (eq t (or (message-options-get 'message-sign-encrypt)
429 'message-sign-encrypt
430 (or (y-or-n-p "Sign the message? ")
433 (mm-with-unibyte-current-buffer
435 (or (message-options-get 'message-recipients)
436 (message-options-set 'message-recipients
437 (mc-cleanup-recipient-headers
438 (read-string "Recipients: "))))
440 (message-options-get 'message-sender))))
441 (goto-char (point-min))
442 (unless (looking-at "-----BEGIN PGP MESSAGE-----")
443 (error "Fail to encrypt the message"))
444 (let ((boundary (mml-compute-boundary cont)))
445 (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
447 (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
448 (insert (format "--%s\n" boundary))
449 (insert "Content-Type: application/pgp-encrypted\n\n")
450 (insert "Version: 1\n\n")
451 (insert (format "--%s\n" boundary))
452 (insert "Content-Type: application/octet-stream\n\n")
453 (goto-char (point-max))
454 (insert (format "--%s--\n" boundary))
455 (goto-char (point-max))))
459 (autoload 'gpg-decrypt "gpg")
460 (autoload 'gpg-verify "gpg")
461 (autoload 'gpg-verify-cleartext "gpg")
462 (autoload 'gpg-sign-detached "gpg")
463 (autoload 'gpg-sign-encrypt "gpg")
464 (autoload 'gpg-encrypt "gpg")
465 (autoload 'gpg-passphrase-read "gpg")
467 (defun mml2015-gpg-passphrase ()
468 (or (message-options-get 'gpg-passphrase)
469 (message-options-set 'gpg-passphrase (gpg-passphrase-read))))
471 (defun mml2015-gpg-decrypt-1 ()
472 (let ((cipher (current-buffer)) plain result)
473 (if (with-temp-buffer
475 (gpg-decrypt cipher (setq plain (current-buffer))
476 mml2015-result-buffer nil)
477 (mm-set-handle-multipart-parameter
478 mm-security-handle 'gnus-details
479 (with-current-buffer mml2015-result-buffer
483 (insert-buffer-substring plain)
484 (goto-char (point-min))
485 (while (search-forward "\r\n" nil t)
486 (replace-match "\n" t t))))
488 ;; Some wrong with the return value, check plain text buffer.
489 (if (> (point-max) (point-min))
493 (defun mml2015-gpg-decrypt (handle ctl)
494 (let ((mml2015-decrypt-function 'mml2015-gpg-decrypt-1))
495 (mml2015-mailcrypt-decrypt handle ctl)))
497 (defun mml2015-gpg-clear-decrypt ()
499 (setq result (mml2015-gpg-decrypt-1))
501 (mm-set-handle-multipart-parameter
502 mm-security-handle 'gnus-info "OK")
503 (mm-set-handle-multipart-parameter
504 mm-security-handle 'gnus-info "Failed"))))
506 (defun mml2015-gpg-pretty-print-fpr (fingerprint)
508 (fpr-length (string-width fingerprint))
511 (setq fingerprint (string-to-list fingerprint))
513 (setq fpr-length (- fpr-length 4))
514 (setq slice (butlast fingerprint fpr-length))
515 (setq fingerprint (nthcdr 4 fingerprint))
516 (setq n-slice (1+ n-slice))
522 (otherwise (concat " " slice))))))
525 (defun mml2015-gpg-extract-signature-details ()
526 (goto-char (point-min))
527 (let* ((expired (re-search-forward
528 "^\\[GNUPG:\\] SIGEXPIRED$"
530 (signer (and (re-search-forward
531 "^\\[GNUPG:\\] GOODSIG \\([0-9A-Za-z]*\\) \\(.*\\)$"
533 (cons (match-string 1) (match-string 2))))
534 (fprint (and (re-search-forward
535 "^\\[GNUPG:\\] VALIDSIG \\([0-9a-zA-Z]*\\) "
538 (trust (and (re-search-forward
539 "^\\[GNUPG:\\] \\(TRUST_.*\\)$"
543 (cdr (assoc trust mml2015-unabbrev-trust-alist))))
544 (cond ((and signer fprint)
546 (unless trust-good-enough-p
547 (concat "\nUntrusted, Fingerprint: "
548 (mml2015-gpg-pretty-print-fpr fprint)))
550 (format "\nWARNING: Signature from expired key (%s)"
553 "^\\(gpg: \\)?Good signature from \"\\(.*\\)\"$" nil t)
556 "From unknown user"))))
558 (defun mml2015-gpg-verify (handle ctl)
560 (let (part message signature info-is-set-p)
561 (unless (setq part (mm-find-raw-part-by-type
562 ctl (or (mm-handle-multipart-ctl-parameter
564 "application/pgp-signature")
566 (mm-set-handle-multipart-parameter
567 mm-security-handle 'gnus-info "Corrupted")
568 (throw 'error handle))
570 (setq message (current-buffer))
572 ;; Convert <LF> to <CR><LF> in signed text. If --textmode is
573 ;; specified when signing, the conversion is not necessary.
574 (goto-char (point-min))
577 (unless (eq (char-before) ?\r)
582 (setq signature (current-buffer))
583 (unless (setq part (mm-find-part-by-type
584 (cdr handle) "application/pgp-signature" nil t))
585 (mm-set-handle-multipart-parameter
586 mm-security-handle 'gnus-info "Corrupted")
587 (throw 'error handle))
588 (mm-insert-part part)
589 (unless (condition-case err
591 (gpg-verify message signature mml2015-result-buffer)
592 (mm-set-handle-multipart-parameter
593 mm-security-handle 'gnus-details
594 (with-current-buffer mml2015-result-buffer
597 (mm-set-handle-multipart-parameter
598 mm-security-handle 'gnus-details (mml2015-format-error err))
599 (mm-set-handle-multipart-parameter
600 mm-security-handle 'gnus-info "Error.")
601 (setq info-is-set-p t)
604 (mm-set-handle-multipart-parameter
605 mm-security-handle 'gnus-details "Quit.")
606 (mm-set-handle-multipart-parameter
607 mm-security-handle 'gnus-info "Quit.")
608 (setq info-is-set-p t)
610 (unless info-is-set-p
611 (mm-set-handle-multipart-parameter
612 mm-security-handle 'gnus-info "Failed"))
613 (throw 'error handle)))
614 (mm-set-handle-multipart-parameter
615 mm-security-handle 'gnus-info
616 (with-current-buffer mml2015-result-buffer
617 (mml2015-gpg-extract-signature-details))))
620 (defun mml2015-gpg-clear-verify ()
621 (if (condition-case err
623 (gpg-verify-cleartext (current-buffer) mml2015-result-buffer)
624 (mm-set-handle-multipart-parameter
625 mm-security-handle 'gnus-details
626 (with-current-buffer mml2015-result-buffer
629 (mm-set-handle-multipart-parameter
630 mm-security-handle 'gnus-details (mml2015-format-error err))
633 (mm-set-handle-multipart-parameter
634 mm-security-handle 'gnus-details "Quit.")
636 (mm-set-handle-multipart-parameter
637 mm-security-handle 'gnus-info
638 (with-current-buffer mml2015-result-buffer
639 (mml2015-gpg-extract-signature-details)))
640 (mm-set-handle-multipart-parameter
641 mm-security-handle 'gnus-info "Failed"))
642 (mml2015-extract-cleartext-signature))
644 (defun mml2015-gpg-sign (cont)
645 (let ((boundary (mml-compute-boundary cont))
646 (text (current-buffer)) signature)
647 (goto-char (point-max))
651 (unless (gpg-sign-detached text (setq signature (current-buffer))
652 mml2015-result-buffer
654 (message-options-get 'message-sender)
655 t t) ; armor & textmode
656 (unless (> (point-max) (point-min))
657 (pop-to-buffer mml2015-result-buffer)
658 (error "Sign error")))
659 (goto-char (point-min))
660 (while (re-search-forward "\r+$" nil t)
661 (replace-match "" t t))
663 (goto-char (point-min))
664 (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
666 ;;; FIXME: what is the micalg?
667 (insert "\tmicalg=pgp-sha1; protocol=\"application/pgp-signature\"\n")
668 (insert (format "\n--%s\n" boundary))
669 (goto-char (point-max))
670 (insert (format "\n--%s\n" boundary))
671 (insert "Content-Type: application/pgp-signature\n\n")
672 (insert-buffer-substring signature)
673 (goto-char (point-max))
674 (insert (format "--%s--\n" boundary))
675 (goto-char (point-max)))))
677 (defun mml2015-gpg-encrypt (cont &optional sign)
678 (let ((boundary (mml-compute-boundary cont))
679 (text (current-buffer))
681 (mm-with-unibyte-current-buffer
683 ;; set up a function to call the correct gpg encrypt routine
684 ;; with the right arguments. (FIXME: this should be done
686 (flet ((gpg-encrypt-func
687 (sign plaintext ciphertext result recipients &optional
688 passphrase sign-with-key armor textmode)
691 plaintext ciphertext result recipients passphrase
692 sign-with-key armor textmode)
694 plaintext ciphertext result recipients passphrase
696 (unless (gpg-encrypt-func
697 sign ; passed in when using signencrypt
698 text (setq cipher (current-buffer))
699 mml2015-result-buffer
702 (message-options-get 'message-recipients)
703 (message-options-set 'message-recipients
704 (read-string "Recipients: ")))
707 (message-options-get 'message-sender)
708 t t) ; armor & textmode
709 (unless (> (point-max) (point-min))
710 (pop-to-buffer mml2015-result-buffer)
711 (error "Encrypt error"))))
712 (goto-char (point-min))
713 (while (re-search-forward "\r+$" nil t)
714 (replace-match "" t t))
716 (delete-region (point-min) (point-max))
717 (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
719 (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
720 (insert (format "--%s\n" boundary))
721 (insert "Content-Type: application/pgp-encrypted\n\n")
722 (insert "Version: 1\n\n")
723 (insert (format "--%s\n" boundary))
724 (insert "Content-Type: application/octet-stream\n\n")
725 (insert-buffer-substring cipher)
726 (goto-char (point-max))
727 (insert (format "--%s--\n" boundary))
728 (goto-char (point-max))))))
732 (defvar pgg-default-user-id)
733 (defvar pgg-errors-buffer)
734 (defvar pgg-output-buffer)
736 (autoload 'pgg-decrypt-region "pgg")
737 (autoload 'pgg-verify-region "pgg")
738 (autoload 'pgg-sign-region "pgg")
739 (autoload 'pgg-encrypt-region "pgg")
740 (autoload 'pgg-parse-armor "pgg-parse")
742 (defun mml2015-pgg-decrypt (handle ctl)
744 (let ((pgg-errors-buffer mml2015-result-buffer)
745 child handles result decrypt-status)
746 (unless (setq child (mm-find-part-by-type
748 "application/octet-stream" nil t))
749 (mm-set-handle-multipart-parameter
750 mm-security-handle 'gnus-info "Corrupted")
751 (throw 'error handle))
753 (mm-insert-part child)
754 (if (condition-case err
756 (pgg-decrypt-region (point-min) (point-max))
758 (with-current-buffer mml2015-result-buffer
760 (mm-set-handle-multipart-parameter
761 mm-security-handle 'gnus-details
764 (mm-set-handle-multipart-parameter
765 mm-security-handle 'gnus-details (mml2015-format-error err))
768 (mm-set-handle-multipart-parameter
769 mm-security-handle 'gnus-details "Quit.")
771 (with-current-buffer pgg-output-buffer
772 (goto-char (point-min))
773 (while (search-forward "\r\n" nil t)
774 (replace-match "\n" t t))
775 (setq handles (mm-dissect-buffer t))
776 (mm-destroy-parts handle)
777 (mm-set-handle-multipart-parameter
778 mm-security-handle 'gnus-info "OK")
779 (mm-set-handle-multipart-parameter
780 mm-security-handle 'gnus-details
781 (concat decrypt-status
782 (when (stringp (car handles))
783 "\n" (mm-handle-multipart-ctl-parameter
784 handles 'gnus-details))))
785 (if (listp (car handles))
788 (mm-set-handle-multipart-parameter
789 mm-security-handle 'gnus-info "Failed")
790 (throw 'error handle))))))
792 (defun mml2015-pgg-clear-decrypt ()
793 (let ((pgg-errors-buffer mml2015-result-buffer))
795 (pgg-decrypt-region (point-min) (point-max))
796 (mm-set-handle-multipart-parameter
797 mm-security-handle 'gnus-details
798 (with-current-buffer mml2015-result-buffer
802 ;; Treat data which pgg returns as a unibyte string.
803 (mm-disable-multibyte)
804 (insert-buffer-substring pgg-output-buffer)
805 (goto-char (point-min))
806 (while (search-forward "\r\n" nil t)
807 (replace-match "\n" t t))
808 (mm-set-handle-multipart-parameter
809 mm-security-handle 'gnus-info "OK"))
810 (mm-set-handle-multipart-parameter
811 mm-security-handle 'gnus-info "Failed"))))
813 (defun mml2015-pgg-verify (handle ctl)
814 (let ((pgg-errors-buffer mml2015-result-buffer)
815 signature-file part signature)
816 (if (or (null (setq part (mm-find-raw-part-by-type
817 ctl (or (mm-handle-multipart-ctl-parameter
819 "application/pgp-signature")
821 (null (setq signature (mm-find-part-by-type
822 (cdr handle) "application/pgp-signature" nil t))))
824 (mm-set-handle-multipart-parameter
825 mm-security-handle 'gnus-info "Corrupted")
829 ;; Convert <LF> to <CR><LF> in signed text. If --textmode is
830 ;; specified when signing, the conversion is not necessary.
831 (goto-char (point-min))
834 (unless (eq (char-before) ?\r)
838 (with-temp-file (setq signature-file (mm-make-temp-file "pgg"))
839 (mm-insert-part signature))
840 (if (condition-case err
842 (pgg-verify-region (point-min) (point-max)
844 (goto-char (point-min))
845 (while (search-forward "\r\n" nil t)
846 (replace-match "\n" t t))
847 (mm-set-handle-multipart-parameter
848 mm-security-handle 'gnus-details
849 (concat (with-current-buffer pgg-output-buffer
851 (with-current-buffer pgg-errors-buffer
854 (mm-set-handle-multipart-parameter
855 mm-security-handle 'gnus-details (mml2015-format-error err))
858 (mm-set-handle-multipart-parameter
859 mm-security-handle 'gnus-details "Quit.")
862 (delete-file signature-file)
863 (mm-set-handle-multipart-parameter
864 mm-security-handle 'gnus-info
865 (with-current-buffer pgg-errors-buffer
866 (mml2015-gpg-extract-signature-details))))
867 (delete-file signature-file)
868 (mm-set-handle-multipart-parameter
869 mm-security-handle 'gnus-info "Failed")))))
872 (defun mml2015-pgg-clear-verify ()
873 (let ((pgg-errors-buffer mml2015-result-buffer)
874 (text (buffer-string))
875 (coding-system buffer-file-coding-system))
876 (if (condition-case err
878 (mm-with-unibyte-buffer
879 (insert (mm-encode-coding-string text coding-system))
880 (pgg-verify-region (point-min) (point-max) nil t))
881 (goto-char (point-min))
882 (while (search-forward "\r\n" nil t)
883 (replace-match "\n" t t))
884 (mm-set-handle-multipart-parameter
885 mm-security-handle 'gnus-details
886 (concat (with-current-buffer pgg-output-buffer
888 (with-current-buffer pgg-errors-buffer
891 (mm-set-handle-multipart-parameter
892 mm-security-handle 'gnus-details (mml2015-format-error err))
895 (mm-set-handle-multipart-parameter
896 mm-security-handle 'gnus-details "Quit.")
898 (mm-set-handle-multipart-parameter
899 mm-security-handle 'gnus-info
900 (with-current-buffer pgg-errors-buffer
901 (mml2015-gpg-extract-signature-details)))
902 (mm-set-handle-multipart-parameter
903 mm-security-handle 'gnus-info "Failed")))
904 (mml2015-extract-cleartext-signature))
906 (defun mml2015-pgg-sign (cont)
907 (let ((pgg-errors-buffer mml2015-result-buffer)
908 (boundary (mml-compute-boundary cont))
909 (pgg-default-user-id (or (message-options-get 'mml-sender)
910 pgg-default-user-id))
913 (unless (pgg-sign-region (point-min) (point-max))
914 (pop-to-buffer mml2015-result-buffer)
915 (error "Sign error"))
916 (goto-char (point-min))
917 (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
919 (if (setq entry (assq 2 (pgg-parse-armor
920 (with-current-buffer pgg-output-buffer
922 (setq entry (assq 'hash-algorithm (cdr entry))))
923 (insert (format "\tmicalg=%s; "
925 (downcase (format "pgp-%s" (cdr entry)))
927 (insert "protocol=\"application/pgp-signature\"\n")
928 (insert (format "\n--%s\n" boundary))
929 (goto-char (point-max))
930 (insert (format "\n--%s\n" boundary))
931 (insert "Content-Type: application/pgp-signature\n\n")
932 (insert-buffer-substring pgg-output-buffer)
933 (goto-char (point-max))
934 (insert (format "--%s--\n" boundary))
935 (goto-char (point-max))))
937 (defun mml2015-pgg-encrypt (cont &optional sign)
938 (let ((pgg-errors-buffer mml2015-result-buffer)
940 (boundary (mml-compute-boundary cont)))
941 (unless (pgg-encrypt-region (point-min) (point-max)
944 (message-options-get 'message-recipients)
945 (message-options-set 'message-recipients
946 (read-string "Recipients: ")))
949 (pop-to-buffer mml2015-result-buffer)
950 (error "Encrypt error"))
951 (delete-region (point-min) (point-max))
952 (goto-char (point-min))
953 (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
955 (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
956 (insert (format "--%s\n" boundary))
957 (insert "Content-Type: application/pgp-encrypted\n\n")
958 (insert "Version: 1\n\n")
959 (insert (format "--%s\n" boundary))
960 (insert "Content-Type: application/octet-stream\n\n")
961 (insert-buffer-substring pgg-output-buffer)
962 (goto-char (point-max))
963 (insert (format "--%s--\n" boundary))
964 (goto-char (point-max))))
968 (defvar epg-user-id-alist)
969 (defvar epg-digest-algorithm-alist)
970 (defvar inhibit-redisplay)
972 (autoload 'epg-make-context "epg")
973 (autoload 'epg-context-set-armor "epg")
974 (autoload 'epg-context-set-textmode "epg")
975 (autoload 'epg-context-set-signers "epg")
976 (autoload 'epg-context-result-for "epg")
977 (autoload 'epg-new-signature-digest-algorithm "epg")
978 (autoload 'epg-verify-result-to-string "epg")
979 (autoload 'epg-list-keys "epg")
980 (autoload 'epg-decrypt-string "epg")
981 (autoload 'epg-verify-string "epg")
982 (autoload 'epg-sign-string "epg")
983 (autoload 'epg-encrypt-string "epg")
984 (autoload 'epg-passphrase-callback-function "epg")
985 (autoload 'epg-context-set-passphrase-callback "epg")
986 (autoload 'epg-key-sub-key-list "epg")
987 (autoload 'epg-sub-key-capability "epg")
988 (autoload 'epg-sub-key-validity "epg")
989 (autoload 'epg-configuration "epg-config")
990 (autoload 'epg-expand-group "epg-config")
991 (autoload 'epa-select-keys "epa")
993 (defvar mml2015-epg-secret-key-id-list nil)
995 (defun mml2015-epg-passphrase-callback (context key-id ignore)
997 (epg-passphrase-callback-function context key-id nil)
998 (let* ((password-cache-key-id
1005 (if (eq key-id 'PIN)
1006 "Passphrase for PIN: "
1007 (if (setq entry (assoc key-id epg-user-id-alist))
1008 (format "Passphrase for %s %s: " key-id (cdr entry))
1009 (format "Passphrase for %s: " key-id)))
1010 password-cache-key-id)))
1012 (let ((password-cache-expiry mml2015-passphrase-cache-expiry))
1013 (password-cache-add password-cache-key-id passphrase))
1014 (setq mml2015-epg-secret-key-id-list
1015 (cons password-cache-key-id mml2015-epg-secret-key-id-list))
1016 (copy-sequence passphrase)))))
1018 (defun mml2015-epg-find-usable-key (keys usage)
1021 (let ((pointer (epg-key-sub-key-list (car keys))))
1023 (if (and (memq usage (epg-sub-key-capability (car pointer)))
1024 (not (memq (epg-sub-key-validity (car pointer))
1025 '(revoked expired))))
1026 (throw 'found (car keys)))
1027 (setq pointer (cdr pointer))))
1028 (setq keys (cdr keys)))))
1030 (defun mml2015-epg-decrypt (handle ctl)
1032 (let ((inhibit-redisplay t)
1033 context plain child handles result decrypt-status)
1034 (unless (setq child (mm-find-part-by-type
1036 "application/octet-stream" nil t))
1037 (mm-set-handle-multipart-parameter
1038 mm-security-handle 'gnus-info "Corrupted")
1039 (throw 'error handle))
1040 (setq context (epg-make-context))
1041 (if mml2015-cache-passphrase
1042 (epg-context-set-passphrase-callback
1044 #'mml2015-epg-passphrase-callback))
1045 (condition-case error
1046 (setq plain (epg-decrypt-string context (mm-get-part child))
1047 mml2015-epg-secret-key-id-list nil)
1049 (while mml2015-epg-secret-key-id-list
1050 (password-cache-remove (car mml2015-epg-secret-key-id-list))
1051 (setq mml2015-epg-secret-key-id-list
1052 (cdr mml2015-epg-secret-key-id-list)))
1053 (mm-set-handle-multipart-parameter
1054 mm-security-handle 'gnus-info "Failed")
1055 (if (eq (car error) 'quit)
1056 (mm-set-handle-multipart-parameter
1057 mm-security-handle 'gnus-details "Quit.")
1058 (mm-set-handle-multipart-parameter
1059 mm-security-handle 'gnus-details (mml2015-format-error error)))
1060 (throw 'error handle)))
1063 (goto-char (point-min))
1064 (while (search-forward "\r\n" nil t)
1065 (replace-match "\n" t t))
1066 (setq handles (mm-dissect-buffer t))
1067 (mm-destroy-parts handle)
1068 (if (epg-context-result-for context 'verify)
1069 (mm-set-handle-multipart-parameter
1070 mm-security-handle 'gnus-info
1072 (epg-verify-result-to-string
1073 (epg-context-result-for context 'verify))))
1074 (mm-set-handle-multipart-parameter
1075 mm-security-handle 'gnus-info "OK"))
1076 (if (stringp (car handles))
1077 (mm-set-handle-multipart-parameter
1078 mm-security-handle 'gnus-details
1079 (mm-handle-multipart-ctl-parameter handles 'gnus-details))))
1080 (if (listp (car handles))
1084 (defun mml2015-epg-clear-decrypt ()
1085 (let ((inhibit-redisplay t)
1086 (context (epg-make-context))
1088 (if mml2015-cache-passphrase
1089 (epg-context-set-passphrase-callback
1091 #'mml2015-epg-passphrase-callback))
1092 (condition-case error
1093 (setq plain (epg-decrypt-string context (buffer-string))
1094 mml2015-epg-secret-key-id-list nil)
1096 (while mml2015-epg-secret-key-id-list
1097 (password-cache-remove (car mml2015-epg-secret-key-id-list))
1098 (setq mml2015-epg-secret-key-id-list
1099 (cdr mml2015-epg-secret-key-id-list)))
1100 (mm-set-handle-multipart-parameter
1101 mm-security-handle 'gnus-info "Failed")
1102 (if (eq (car error) 'quit)
1103 (mm-set-handle-multipart-parameter
1104 mm-security-handle 'gnus-details "Quit.")
1105 (mm-set-handle-multipart-parameter
1106 mm-security-handle 'gnus-details (mml2015-format-error error)))))
1109 ;; Treat data which epg returns as a unibyte string.
1110 (mm-disable-multibyte)
1112 (goto-char (point-min))
1113 (while (search-forward "\r\n" nil t)
1114 (replace-match "\n" t t))
1115 (mm-set-handle-multipart-parameter
1116 mm-security-handle 'gnus-info "OK")
1117 (if (epg-context-result-for context 'verify)
1118 (mm-set-handle-multipart-parameter
1119 mm-security-handle 'gnus-details
1120 (epg-verify-result-to-string
1121 (epg-context-result-for context 'verify)))))))
1123 (defun mml2015-epg-verify (handle ctl)
1125 (let ((inhibit-redisplay t)
1126 context plain signature-file part signature)
1127 (when (or (null (setq part (mm-find-raw-part-by-type
1128 ctl (or (mm-handle-multipart-ctl-parameter
1130 "application/pgp-signature")
1132 (null (setq signature (mm-find-part-by-type
1133 (cdr handle) "application/pgp-signature"
1135 (mm-set-handle-multipart-parameter
1136 mm-security-handle 'gnus-info "Corrupted")
1137 (throw 'error handle))
1138 (setq part (mm-replace-in-string part "\n" "\r\n" t)
1139 signature (mm-get-part signature)
1140 context (epg-make-context))
1141 (condition-case error
1142 (setq plain (epg-verify-string context signature part))
1144 (mm-set-handle-multipart-parameter
1145 mm-security-handle 'gnus-info "Failed")
1146 (if (eq (car error) 'quit)
1147 (mm-set-handle-multipart-parameter
1148 mm-security-handle 'gnus-details "Quit.")
1149 (mm-set-handle-multipart-parameter
1150 mm-security-handle 'gnus-details (mml2015-format-error error)))
1151 (throw 'error handle)))
1152 (mm-set-handle-multipart-parameter
1153 mm-security-handle 'gnus-info
1154 (epg-verify-result-to-string (epg-context-result-for context 'verify)))
1157 (defun mml2015-epg-clear-verify ()
1158 (let ((inhibit-redisplay t)
1159 (context (epg-make-context))
1160 (signature (mm-encode-coding-string (buffer-string)
1161 coding-system-for-write))
1163 (condition-case error
1164 (setq plain (epg-verify-string context signature))
1166 (mm-set-handle-multipart-parameter
1167 mm-security-handle 'gnus-info "Failed")
1168 (if (eq (car error) 'quit)
1169 (mm-set-handle-multipart-parameter
1170 mm-security-handle 'gnus-details "Quit.")
1171 (mm-set-handle-multipart-parameter
1172 mm-security-handle 'gnus-details (mml2015-format-error error)))))
1175 (mm-set-handle-multipart-parameter
1176 mm-security-handle 'gnus-info
1177 (epg-verify-result-to-string
1178 (epg-context-result-for context 'verify)))
1179 (delete-region (point-min) (point-max))
1180 (insert (mm-decode-coding-string plain coding-system-for-read)))
1181 (mml2015-extract-cleartext-signature))))
1183 (defun mml2015-epg-sign (cont)
1184 (let* ((inhibit-redisplay t)
1185 (context (epg-make-context))
1186 (boundary (mml-compute-boundary cont))
1189 (or (message-options-get 'mml2015-epg-signers)
1190 (message-options-set
1191 'mml2015-epg-signers
1192 (if (eq mm-sign-option 'guided)
1193 (epa-select-keys context "\
1194 Select keys for signing.
1195 If no one is selected, default secret key is used. "
1201 (setq signer-key (mml2015-epg-find-usable-key
1202 (epg-list-keys context signer t)
1204 (unless (or signer-key
1207 "No secret key for %s; skip it? "
1209 (error "No secret key for %s" signer))
1211 mml2015-signers)))))))
1213 (epg-context-set-armor context t)
1214 (epg-context-set-textmode context t)
1215 (epg-context-set-signers context signers)
1216 (if mml2015-cache-passphrase
1217 (epg-context-set-passphrase-callback
1219 #'mml2015-epg-passphrase-callback))
1220 (condition-case error
1221 (setq signature (epg-sign-string context (buffer-string) t)
1222 mml2015-epg-secret-key-id-list nil)
1224 (while mml2015-epg-secret-key-id-list
1225 (password-cache-remove (car mml2015-epg-secret-key-id-list))
1226 (setq mml2015-epg-secret-key-id-list
1227 (cdr mml2015-epg-secret-key-id-list)))
1228 (signal (car error) (cdr error))))
1229 (if (epg-context-result-for context 'sign)
1230 (setq micalg (epg-new-signature-digest-algorithm
1231 (car (epg-context-result-for context 'sign)))))
1232 (goto-char (point-min))
1233 (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
1236 (insert (format "\tmicalg=pgp-%s; "
1239 epg-digest-algorithm-alist))))))
1240 (insert "protocol=\"application/pgp-signature\"\n")
1241 (insert (format "\n--%s\n" boundary))
1242 (goto-char (point-max))
1243 (insert (format "\n--%s\n" boundary))
1244 (insert "Content-Type: application/pgp-signature\n\n")
1246 (goto-char (point-max))
1247 (insert (format "--%s--\n" boundary))
1248 (goto-char (point-max))))
1250 (defun mml2015-epg-encrypt (cont &optional sign)
1251 (let ((inhibit-redisplay t)
1252 (context (epg-make-context))
1253 (config (epg-configuration))
1254 (recipients (message-options-get 'mml2015-epg-recipients))
1256 (boundary (mml-compute-boundary cont))
1257 recipient-key signer-key)
1263 (or (epg-expand-group config recipient)
1264 (list (concat "<" recipient ">"))))
1266 (or (message-options-get 'message-recipients)
1267 (message-options-set 'message-recipients
1268 (read-string "Recipients: ")))
1269 "[ \f\t\n\r\v,]+"))))
1270 (when mml2015-encrypt-to-self
1271 (unless mml2015-signers
1272 (error "mml2015-signers not set"))
1273 (setq recipients (nconc recipients mml2015-signers)))
1274 (if (eq mm-encrypt-option 'guided)
1276 (epa-select-keys context "\
1277 Select recipients for encryption.
1278 If no one is selected, symmetric encryption will be performed. "
1284 (setq recipient-key (mml2015-epg-find-usable-key
1285 (epg-list-keys context recipient)
1287 (unless (or recipient-key
1289 (format "No public key for %s; skip it? "
1291 (error "No public key for %s" recipient))
1295 (error "No recipient specified")))
1296 (message-options-set 'mml2015-epg-recipients recipients))
1299 (or (message-options-get 'mml2015-epg-signers)
1300 (message-options-set
1301 'mml2015-epg-signers
1302 (if (eq mm-sign-option 'guided)
1303 (epa-select-keys context "\
1304 Select keys for signing.
1305 If no one is selected, default secret key is used. "
1311 (setq signer-key (mml2015-epg-find-usable-key
1312 (epg-list-keys context signer t)
1314 (unless (or signer-key
1317 "No secret key for %s; skip it? "
1319 (error "No secret key for %s" signer))
1321 mml2015-signers)))))))
1322 (epg-context-set-signers context signers))
1323 (epg-context-set-armor context t)
1324 (epg-context-set-textmode context t)
1325 (if mml2015-cache-passphrase
1326 (epg-context-set-passphrase-callback
1328 #'mml2015-epg-passphrase-callback))
1329 (condition-case error
1331 (epg-encrypt-string context (buffer-string) recipients sign
1332 mml2015-always-trust)
1333 mml2015-epg-secret-key-id-list nil)
1335 (while mml2015-epg-secret-key-id-list
1336 (password-cache-remove (car mml2015-epg-secret-key-id-list))
1337 (setq mml2015-epg-secret-key-id-list
1338 (cdr mml2015-epg-secret-key-id-list)))
1339 (signal (car error) (cdr error))))
1340 (delete-region (point-min) (point-max))
1341 (goto-char (point-min))
1342 (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
1344 (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
1345 (insert (format "--%s\n" boundary))
1346 (insert "Content-Type: application/pgp-encrypted\n\n")
1347 (insert "Version: 1\n\n")
1348 (insert (format "--%s\n" boundary))
1349 (insert "Content-Type: application/octet-stream\n\n")
1351 (goto-char (point-max))
1352 (insert (format "--%s--\n" boundary))
1353 (goto-char (point-max))))
1357 (autoload 'gnus-buffer-live-p "gnus-util")
1358 (autoload 'gnus-get-buffer-create "gnus")
1360 (defun mml2015-clean-buffer ()
1361 (if (gnus-buffer-live-p mml2015-result-buffer)
1362 (with-current-buffer mml2015-result-buffer
1365 (setq mml2015-result-buffer
1366 (gnus-get-buffer-create " *MML2015 Result*"))
1369 (defsubst mml2015-clear-decrypt-function ()
1370 (nth 6 (assq mml2015-use mml2015-function-alist)))
1372 (defsubst mml2015-clear-verify-function ()
1373 (nth 5 (assq mml2015-use mml2015-function-alist)))
1376 (defun mml2015-decrypt (handle ctl)
1377 (mml2015-clean-buffer)
1378 (let ((func (nth 4 (assq mml2015-use mml2015-function-alist))))
1380 (funcall func handle ctl)
1384 (defun mml2015-decrypt-test (handle ctl)
1388 (defun mml2015-verify (handle ctl)
1389 (mml2015-clean-buffer)
1390 (let ((func (nth 3 (assq mml2015-use mml2015-function-alist))))
1392 (funcall func handle ctl)
1396 (defun mml2015-verify-test (handle ctl)
1400 (defun mml2015-encrypt (cont &optional sign)
1401 (mml2015-clean-buffer)
1402 (let ((func (nth 2 (assq mml2015-use mml2015-function-alist))))
1404 (funcall func cont sign)
1405 (error "Cannot find encrypt function"))))
1408 (defun mml2015-sign (cont)
1409 (mml2015-clean-buffer)
1410 (let ((func (nth 1 (assq mml2015-use mml2015-function-alist))))
1413 (error "Cannot find sign function"))))
1416 (defun mml2015-self-encrypt ()
1417 (mml2015-encrypt nil))
1421 ;; arch-tag: b04701d5-0b09-44d8-bed8-de901bf435f2
1422 ;;; mml2015.el ends here