Include blockinput.h.
[emacs.git] / lisp / pgg.el
blobf6a5a96d2b84aa87e0816737b5f99ed7f6574719
1 ;;; pgg.el --- glue for the various PGP implementations.
3 ;; Copyright (C) 1999, 2000, 2002, 2003, 2004,
4 ;; 2005, 2006, 2007 Free Software Foundation, Inc.
6 ;; Author: Daiki Ueno <ueno@unixuser.org>
7 ;; Symmetric encryption added by: Sascha Wilde <wilde@sha-bang.de>
8 ;; Created: 1999/10/28
9 ;; Keywords: PGP
11 ;; This file is part of GNU Emacs.
13 ;; GNU Emacs is free software; you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; any later version.
18 ;; GNU Emacs is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with GNU Emacs; see the file COPYING. If not, write to the
25 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
26 ;; Boston, MA 02110-1301, USA.
28 ;;; Commentary:
30 ;;; Code:
32 (require 'pgg-def)
33 (require 'pgg-parse)
34 (autoload 'run-at-time "timer")
36 ;; Don't merge these two `eval-when-compile's.
37 (eval-when-compile
38 (require 'cl))
40 ;;; @ utility functions
41 ;;;
43 (defun pgg-invoke (func scheme &rest args)
44 (progn
45 (require (intern (format "pgg-%s" scheme)))
46 (apply 'funcall (intern (format "pgg-%s-%s" scheme func)) args)))
48 (put 'pgg-save-coding-system 'lisp-indent-function 2)
50 (defmacro pgg-save-coding-system (start end &rest body)
51 `(if (interactive-p)
52 (let ((buffer (current-buffer)))
53 (with-temp-buffer
54 (let (buffer-undo-list)
55 (insert-buffer-substring buffer ,start ,end)
56 (encode-coding-region (point-min)(point-max)
57 buffer-file-coding-system)
58 (prog1 (save-excursion ,@body)
59 (push nil buffer-undo-list)
60 (ignore-errors (undo))))))
61 (save-restriction
62 (narrow-to-region ,start ,end)
63 ,@body)))
65 (defun pgg-temp-buffer-show-function (buffer)
66 (let ((window (or (get-buffer-window buffer 'visible)
67 (split-window-vertically))))
68 (set-window-buffer window buffer)
69 (shrink-window-if-larger-than-buffer window)))
71 ;; XXX `pgg-display-output-buffer' is a horrible name for this function.
72 ;; It should be something like `pgg-situate-output-or-display-error'.
73 (defun pgg-display-output-buffer (start end status)
74 "Situate en/decryption results or pop up an error buffer.
76 Text from START to END is replaced by contents of output buffer if STATUS
77 is true, or else the output buffer is displayed."
78 (if status
79 (pgg-situate-output start end)
80 (pgg-display-error-buffer)))
82 (defun pgg-situate-output (start end)
83 "Place en/decryption result in place of current text from START to END."
84 (delete-region start end)
85 (insert-buffer-substring pgg-output-buffer)
86 (decode-coding-region start (point) buffer-file-coding-system))
88 (defun pgg-display-error-buffer ()
89 "Pop up an error buffer indicating the reason for an en/decryption failure."
90 (let ((temp-buffer-show-function
91 (function pgg-temp-buffer-show-function)))
92 (with-output-to-temp-buffer pgg-echo-buffer
93 (set-buffer standard-output)
94 (insert-buffer-substring pgg-errors-buffer))))
96 (defvar pgg-passphrase-cache (make-vector 7 0))
98 (defvar pgg-pending-timers (make-vector 7 0)
99 "Hash table for managing scheduled pgg cache management timers.
101 We associate key and timer, so the timer can be cancelled if a new
102 timeout for the key is set while an old one is still pending.")
104 (defun pgg-read-passphrase (prompt &optional key notruncate)
105 "Using PROMPT, obtain passphrase for KEY from cache or user.
107 Truncate the key to 8 trailing characters unless NOTRUNCATE is true
108 \(default false).
110 Custom variables `pgg-cache-passphrase' and `pgg-passphrase-cache-expiry'
111 regulate cache behavior."
112 (or (pgg-read-passphrase-from-cache key notruncate)
113 (read-passwd prompt)))
115 (defun pgg-read-passphrase-from-cache (key &optional notruncate)
116 "Obtain passphrase for KEY from time-limited passphrase cache.
118 Truncate the key to 8 trailing characters unless NOTRUNCATE is true
119 \(default false).
121 Custom variables `pgg-cache-passphrase' and `pgg-passphrase-cache-expiry'
122 regulate cache behavior."
123 (and pgg-cache-passphrase
124 key (or notruncate
125 (setq key (pgg-truncate-key-identifier key)))
126 (symbol-value (intern-soft key pgg-passphrase-cache))))
128 (defun pgg-add-passphrase-to-cache (key passphrase &optional notruncate)
129 "Associate KEY with PASSPHRASE in time-limited passphrase cache.
131 Truncate the key to 8 trailing characters unless NOTRUNCATE is true
132 \(default false).
134 Custom variables `pgg-cache-passphrase' and `pgg-passphrase-cache-expiry'
135 regulate cache behavior."
137 (let* ((key (if notruncate key (pgg-truncate-key-identifier key)))
138 (interned-timer-key (intern-soft key pgg-pending-timers))
139 (old-timer (symbol-value interned-timer-key))
140 new-timer)
141 (when old-timer
142 (cancel-timer old-timer)
143 (unintern interned-timer-key pgg-pending-timers))
144 (set (intern key pgg-passphrase-cache)
145 passphrase)
146 (set (intern key pgg-pending-timers)
147 (pgg-run-at-time pgg-passphrase-cache-expiry nil
148 #'pgg-remove-passphrase-from-cache
149 key notruncate))))
151 (if (fboundp 'clear-string)
152 (defalias 'pgg-clear-string 'clear-string)
153 (defun pgg-clear-string (string)
154 (fillarray string ?_)))
156 (defun pgg-remove-passphrase-from-cache (key &optional notruncate)
157 "Omit passphrase associated with KEY in time-limited passphrase cache.
159 Truncate the key to 8 trailing characters unless NOTRUNCATE is true
160 \(default false).
162 This is a no-op if there is not entry for KEY (eg, it's already expired.
164 The memory for the passphrase is filled with underscores to clear any
165 references to it.
167 Custom variables `pgg-cache-passphrase' and `pgg-passphrase-cache-expiry'
168 regulate cache behavior."
169 (let* ((passphrase (pgg-read-passphrase-from-cache key notruncate))
170 (key (if notruncate key (pgg-truncate-key-identifier key)))
171 (interned-timer-key (intern-soft key pgg-pending-timers))
172 (old-timer (symbol-value interned-timer-key)))
173 (when passphrase
174 (pgg-clear-string passphrase)
175 (unintern key pgg-passphrase-cache))
176 (when old-timer
177 (pgg-cancel-timer old-timer)
178 (unintern interned-timer-key pgg-pending-timers))))
180 (eval-when-compile
181 (defmacro pgg-run-at-time-1 (time repeat function args)
182 (when (featurep 'xemacs)
183 (if (condition-case nil
184 (let ((delete-itimer 'delete-itimer)
185 (itimer-driver-start 'itimer-driver-start)
186 (itimer-value 'itimer-value)
187 (start-itimer 'start-itimer))
188 (unless (or (symbol-value 'itimer-process)
189 (symbol-value 'itimer-timer))
190 (funcall itimer-driver-start))
191 ;; Check whether there is a bug to which the difference of
192 ;; the present time and the time when the itimer driver was
193 ;; woken up is subtracted from the initial itimer value.
194 (let* ((inhibit-quit t)
195 (ctime (current-time))
196 (itimer-timer-last-wakeup
197 (prog1
198 ctime
199 (setcar ctime (1- (car ctime)))))
200 (itimer-list nil)
201 (itimer (funcall start-itimer "pgg-run-at-time"
202 'ignore 5)))
203 (sleep-for 0.1) ;; Accept the timeout interrupt.
204 (prog1
205 (> (funcall itimer-value itimer) 0)
206 (funcall delete-itimer itimer))))
207 (error nil))
208 `(let ((time ,time))
209 (apply #'start-itimer "pgg-run-at-time"
210 ,function (if time (max time 1e-9) 1e-9)
211 ,repeat nil t ,args)))
212 `(let ((time ,time)
213 (itimers (list nil)))
214 (setcar
215 itimers
216 (apply #'start-itimer "pgg-run-at-time"
217 (lambda (itimers repeat function &rest args)
218 (let ((itimer (car itimers)))
219 (if repeat
220 (progn
221 (set-itimer-function
222 itimer
223 (lambda (itimer repeat function &rest args)
224 (set-itimer-restart itimer repeat)
225 (set-itimer-function itimer function)
226 (set-itimer-function-arguments itimer args)
227 (apply function args)))
228 (set-itimer-function-arguments
229 itimer
230 (append (list itimer repeat function) args)))
231 (set-itimer-function
232 itimer
233 (lambda (itimer function &rest args)
234 (delete-itimer itimer)
235 (apply function args)))
236 (set-itimer-function-arguments
237 itimer
238 (append (list itimer function) args)))))
239 1e-9 (if time (max time 1e-9) 1e-9)
240 nil t itimers ,repeat ,function ,args))))))
242 (eval-and-compile
243 (if (featurep 'xemacs)
244 (progn
245 (defun pgg-run-at-time (time repeat function &rest args)
246 "Emulating function run as `run-at-time'.
247 TIME should be nil meaning now, or a number of seconds from now.
248 Return an itimer object which can be used in either `delete-itimer'
249 or `cancel-timer'."
250 (pgg-run-at-time-1 time repeat function args))
251 (defun pgg-cancel-timer (timer)
252 "Emulate cancel-timer for xemacs."
253 (let ((delete-itimer 'delete-itimer))
254 (funcall delete-itimer timer)))
256 (defalias 'pgg-run-at-time 'run-at-time)
257 (defalias 'pgg-cancel-timer 'cancel-timer)))
259 (defmacro pgg-convert-lbt-region (start end lbt)
260 `(let ((pgg-conversion-end (set-marker (make-marker) ,end)))
261 (goto-char ,start)
262 (case ,lbt
263 (CRLF
264 (while (progn
265 (end-of-line)
266 (> (marker-position pgg-conversion-end) (point)))
267 (insert "\r")
268 (forward-line 1)))
270 (while (re-search-forward "\r$" pgg-conversion-end t)
271 (replace-match ""))))))
273 (put 'pgg-as-lbt 'lisp-indent-function 3)
275 (defmacro pgg-as-lbt (start end lbt &rest body)
276 `(let ((inhibit-read-only t)
277 buffer-read-only
278 buffer-undo-list)
279 (pgg-convert-lbt-region ,start ,end ,lbt)
280 (let ((,end (point)))
281 ,@body)
282 (push nil buffer-undo-list)
283 (ignore-errors (undo))))
285 (put 'pgg-process-when-success 'lisp-indent-function 0)
287 (defmacro pgg-process-when-success (&rest body)
288 `(with-current-buffer pgg-output-buffer
289 (if (zerop (buffer-size)) nil ,@body t)))
291 (defalias 'pgg-make-temp-file
292 (if (fboundp 'make-temp-file)
293 'make-temp-file
294 (lambda (prefix &optional dir-flag)
295 (let ((file (expand-file-name
296 (make-temp-name prefix)
297 (if (fboundp 'temp-directory)
298 (temp-directory)
299 temporary-file-directory))))
300 (if dir-flag
301 (make-directory file))
302 file))))
304 ;;; @ interface functions
307 ;;;###autoload
308 (defun pgg-encrypt-region (start end rcpts &optional sign passphrase)
309 "Encrypt the current region between START and END for RCPTS.
311 If optional argument SIGN is non-nil, do a combined sign and encrypt.
313 If optional PASSPHRASE is not specified, it will be obtained from the
314 passphrase cache or user."
315 (interactive
316 (list (region-beginning)(region-end)
317 (split-string (read-string "Recipients: ") "[ \t,]+")))
318 (let ((status
319 (pgg-save-coding-system start end
320 (pgg-invoke "encrypt-region" (or pgg-scheme pgg-default-scheme)
321 (point-min) (point-max) rcpts sign passphrase))))
322 (when (interactive-p)
323 (pgg-display-output-buffer start end status))
324 status))
326 ;;;###autoload
327 (defun pgg-encrypt-symmetric-region (start end &optional passphrase)
328 "Encrypt the current region between START and END symmetric with passphrase.
330 If optional PASSPHRASE is not specified, it will be obtained from the
331 cache or user."
332 (interactive "r")
333 (let ((status
334 (pgg-save-coding-system start end
335 (pgg-invoke "encrypt-symmetric-region"
336 (or pgg-scheme pgg-default-scheme)
337 (point-min) (point-max) passphrase))))
338 (when (interactive-p)
339 (pgg-display-output-buffer start end status))
340 status))
342 ;;;###autoload
343 (defun pgg-encrypt-symmetric (&optional start end passphrase)
344 "Encrypt the current buffer using a symmetric, rather than key-pair, cipher.
346 If optional arguments START and END are specified, only encrypt within
347 the region.
349 If optional PASSPHRASE is not specified, it will be obtained from the
350 passphrase cache or user."
351 (interactive)
352 (let* ((start (or start (point-min)))
353 (end (or end (point-max)))
354 (status (pgg-encrypt-symmetric-region start end passphrase)))
355 (when (interactive-p)
356 (pgg-display-output-buffer start end status))
357 status))
359 ;;;###autoload
360 (defun pgg-encrypt (rcpts &optional sign start end passphrase)
361 "Encrypt the current buffer for RCPTS.
363 If optional argument SIGN is non-nil, do a combined sign and encrypt.
365 If optional arguments START and END are specified, only encrypt within
366 the region.
368 If optional PASSPHRASE is not specified, it will be obtained from the
369 passphrase cache or user."
370 (interactive (list (split-string (read-string "Recipients: ") "[ \t,]+")))
371 (let* ((start (or start (point-min)))
372 (end (or end (point-max)))
373 (status (pgg-encrypt-region start end rcpts sign passphrase)))
374 (when (interactive-p)
375 (pgg-display-output-buffer start end status))
376 status))
378 ;;;###autoload
379 (defun pgg-decrypt-region (start end &optional passphrase)
380 "Decrypt the current region between START and END.
382 If optional PASSPHRASE is not specified, it will be obtained from the
383 passphrase cache or user."
384 (interactive "r")
385 (let* ((buf (current-buffer))
386 (status
387 (pgg-save-coding-system start end
388 (pgg-invoke "decrypt-region" (or pgg-scheme pgg-default-scheme)
389 (point-min) (point-max) passphrase))))
390 (when (interactive-p)
391 (pgg-display-output-buffer start end status))
392 status))
394 ;;;###autoload
395 (defun pgg-decrypt (&optional start end passphrase)
396 "Decrypt the current buffer.
398 If optional arguments START and END are specified, only decrypt within
399 the region.
401 If optional PASSPHRASE is not specified, it will be obtained from the
402 passphrase cache or user."
403 (interactive "")
404 (let* ((start (or start (point-min)))
405 (end (or end (point-max)))
406 (status (pgg-decrypt-region start end passphrase)))
407 (when (interactive-p)
408 (pgg-display-output-buffer start end status))
409 status))
411 ;;;###autoload
412 (defun pgg-sign-region (start end &optional cleartext passphrase)
413 "Make the signature from text between START and END.
415 If the optional 3rd argument CLEARTEXT is non-nil, it does not create
416 a detached signature.
418 If this function is called interactively, CLEARTEXT is enabled
419 and the the output is displayed.
421 If optional PASSPHRASE is not specified, it will be obtained from the
422 passphrase cache or user."
423 (interactive "r")
424 (let ((status (pgg-save-coding-system start end
425 (pgg-invoke "sign-region" (or pgg-scheme pgg-default-scheme)
426 (point-min) (point-max)
427 (or (interactive-p) cleartext)
428 passphrase))))
429 (when (interactive-p)
430 (pgg-display-output-buffer start end status))
431 status))
433 ;;;###autoload
434 (defun pgg-sign (&optional cleartext start end passphrase)
435 "Sign the current buffer.
437 If the optional argument CLEARTEXT is non-nil, it does not create a
438 detached signature.
440 If optional arguments START and END are specified, only sign data
441 within the region.
443 If this function is called interactively, CLEARTEXT is enabled
444 and the the output is displayed.
446 If optional PASSPHRASE is not specified, it will be obtained from the
447 passphrase cache or user."
448 (interactive "")
449 (let* ((start (or start (point-min)))
450 (end (or end (point-max)))
451 (status (pgg-sign-region start end
452 (or (interactive-p) cleartext)
453 passphrase)))
454 (when (interactive-p)
455 (pgg-display-output-buffer start end status))
456 status))
458 ;;;###autoload
459 (defun pgg-verify-region (start end &optional signature fetch)
460 "Verify the current region between START and END.
461 If the optional 3rd argument SIGNATURE is non-nil, it is treated as
462 the detached signature of the current region.
464 If the optional 4th argument FETCH is non-nil, we attempt to fetch the
465 signer's public key from `pgg-default-keyserver-address'."
466 (interactive "r")
467 (let* ((packet
468 (if (null signature) nil
469 (with-temp-buffer
470 (buffer-disable-undo)
471 (if (fboundp 'set-buffer-multibyte)
472 (set-buffer-multibyte nil))
473 (insert-file-contents signature)
474 (cdr (assq 2 (pgg-decode-armor-region
475 (point-min)(point-max)))))))
476 (key (cdr (assq 'key-identifier packet)))
477 status keyserver)
478 (and (stringp key)
479 pgg-query-keyserver
480 (setq key (concat "0x" (pgg-truncate-key-identifier key)))
481 (null (pgg-lookup-key key))
482 (or fetch (interactive-p))
483 (y-or-n-p (format "Key %s not found; attempt to fetch? " key))
484 (setq keyserver
485 (or (cdr (assq 'preferred-key-server packet))
486 pgg-default-keyserver-address))
487 (pgg-fetch-key keyserver key))
488 (setq status
489 (pgg-save-coding-system start end
490 (pgg-invoke "verify-region" (or pgg-scheme pgg-default-scheme)
491 (point-min) (point-max) signature)))
492 (when (interactive-p)
493 (let ((temp-buffer-show-function
494 (function pgg-temp-buffer-show-function)))
495 (with-output-to-temp-buffer pgg-echo-buffer
496 (set-buffer standard-output)
497 (insert-buffer-substring (if status pgg-output-buffer
498 pgg-errors-buffer)))))
499 status))
501 ;;;###autoload
502 (defun pgg-verify (&optional signature fetch start end)
503 "Verify the current buffer.
504 If the optional argument SIGNATURE is non-nil, it is treated as
505 the detached signature of the current region.
506 If the optional argument FETCH is non-nil, we attempt to fetch the
507 signer's public key from `pgg-default-keyserver-address'.
508 If optional arguments START and END are specified, only verify data
509 within the region."
510 (interactive "")
511 (let* ((start (or start (point-min)))
512 (end (or end (point-max)))
513 (status (pgg-verify-region start end signature fetch)))
514 (when (interactive-p)
515 (let ((temp-buffer-show-function
516 (function pgg-temp-buffer-show-function)))
517 (with-output-to-temp-buffer pgg-echo-buffer
518 (set-buffer standard-output)
519 (insert-buffer-substring (if status pgg-output-buffer
520 pgg-errors-buffer)))))
521 status))
523 ;;;###autoload
524 (defun pgg-insert-key ()
525 "Insert the ASCII armored public key."
526 (interactive)
527 (pgg-invoke "insert-key" (or pgg-scheme pgg-default-scheme)))
529 ;;;###autoload
530 (defun pgg-snarf-keys-region (start end)
531 "Import public keys in the current region between START and END."
532 (interactive "r")
533 (pgg-save-coding-system start end
534 (pgg-invoke "snarf-keys-region" (or pgg-scheme pgg-default-scheme)
535 start end)))
537 ;;;###autoload
538 (defun pgg-snarf-keys ()
539 "Import public keys in the current buffer."
540 (interactive "")
541 (pgg-snarf-keys-region (point-min) (point-max)))
543 (defun pgg-lookup-key (string &optional type)
544 (pgg-invoke "lookup-key" (or pgg-scheme pgg-default-scheme) string type))
546 (defvar pgg-insert-url-function (function pgg-insert-url-with-w3))
548 (defun pgg-insert-url-with-w3 (url)
549 (ignore-errors
550 (require 'url)
551 (let (buffer-file-name)
552 (url-insert-file-contents url))))
554 (defvar pgg-insert-url-extra-arguments nil)
555 (defvar pgg-insert-url-program nil)
557 (defun pgg-insert-url-with-program (url)
558 (let ((args (copy-sequence pgg-insert-url-extra-arguments))
559 process)
560 (insert
561 (with-temp-buffer
562 (setq process
563 (apply #'start-process " *PGG url*" (current-buffer)
564 pgg-insert-url-program (nconc args (list url))))
565 (set-process-sentinel process #'ignore)
566 (while (eq 'run (process-status process))
567 (accept-process-output process 5))
568 (delete-process process)
569 (if (and process (eq 'run (process-status process)))
570 (interrupt-process process))
571 (buffer-string)))))
573 (defun pgg-fetch-key (keyserver key)
574 "Attempt to fetch a KEY from KEYSERVER for addition to PGP or GnuPG keyring."
575 (with-current-buffer (get-buffer-create pgg-output-buffer)
576 (buffer-disable-undo)
577 (erase-buffer)
578 (let ((proto (if (string-match "^[a-zA-Z\\+\\.\\\\-]+:" keyserver)
579 (substring keyserver 0 (1- (match-end 0))))))
580 (save-excursion
581 (funcall pgg-insert-url-function
582 (if proto keyserver
583 (format "http://%s:11371/pks/lookup?op=get&search=%s"
584 keyserver key))))
585 (when (re-search-forward "^-+BEGIN" nil 'last)
586 (delete-region (point-min) (match-beginning 0))
587 (when (re-search-forward "^-+END" nil t)
588 (delete-region (progn (end-of-line) (point))
589 (point-max)))
590 (insert "\n")
591 (with-temp-buffer
592 (insert-buffer-substring pgg-output-buffer)
593 (pgg-snarf-keys-region (point-min)(point-max)))))))
596 (provide 'pgg)
598 ;;; arch-tag: 9cc705dd-1e6a-4c90-8dce-c3561f9a2cf4
599 ;;; pgg.el ends here