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1 | ;;; pgg-gpg.el --- GnuPG support for PGG. |
2 | ||
e84b4b86 | 3 | ;; Copyright (C) 1999, 2000, 2002, 2003, 2004, |
5df4f04c | 4 | ;; 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
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5 | |
6 | ;; Author: Daiki Ueno <ueno@unixuser.org> | |
60c6189d RS |
7 | ;; Symmetric encryption and gpg-agent support added by: |
8 | ;; Sascha Wilde <wilde@sha-bang.de> | |
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9 | ;; Created: 1999/10/28 |
10 | ;; Keywords: PGP, OpenPGP, GnuPG | |
11 | ||
12 | ;; This file is part of GNU Emacs. | |
13 | ||
eb3fa2cf | 14 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
23f87bed | 15 | ;; it under the terms of the GNU General Public License as published by |
eb3fa2cf GM |
16 | ;; the Free Software Foundation, either version 3 of the License, or |
17 | ;; (at your option) any later version. | |
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18 | |
19 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
20 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | ;; GNU General Public License for more details. | |
23 | ||
24 | ;; You should have received a copy of the GNU General Public License | |
eb3fa2cf | 25 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
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26 | |
27 | ;;; Code: | |
28 | ||
29 | (eval-when-compile | |
30ceaa68 | 30 | (require 'cl) ; for gpg macros |
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31 | (require 'pgg)) |
32 | ||
33 | (defgroup pgg-gpg () | |
4a836a63 | 34 | "GnuPG interface." |
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35 | :group 'pgg) |
36 | ||
37 | (defcustom pgg-gpg-program "gpg" | |
38 | "The GnuPG executable." | |
39 | :group 'pgg-gpg | |
40 | :type 'string) | |
41 | ||
42 | (defcustom pgg-gpg-extra-args nil | |
43 | "Extra arguments for every GnuPG invocation." | |
44 | :group 'pgg-gpg | |
45 | :type '(repeat (string :tag "Argument"))) | |
46 | ||
47 | (defcustom pgg-gpg-recipient-argument "--recipient" | |
48 | "GnuPG option to specify recipient." | |
49 | :group 'pgg-gpg | |
50 | :type '(choice (const :tag "New `--recipient' option" "--recipient") | |
51 | (const :tag "Old `--remote-user' option" "--remote-user"))) | |
52 | ||
2016560b | 53 | (defcustom pgg-gpg-use-agent t |
60c6189d RS |
54 | "Whether to use gnupg agent for key caching." |
55 | :group 'pgg-gpg | |
56 | :type 'boolean) | |
57 | ||
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58 | (defvar pgg-gpg-user-id nil |
59 | "GnuPG ID of your default identity.") | |
60 | ||
30ceaa68 | 61 | (defun pgg-gpg-process-region (start end passphrase program args) |
4ebb03e6 | 62 | (let* ((use-agent (and (null passphrase) (pgg-gpg-use-agent-p))) |
60c6189d | 63 | (output-file-name (pgg-make-temp-file "pgg-output")) |
23f87bed | 64 | (args |
30ceaa68 | 65 | `("--status-fd" "2" |
60c6189d RS |
66 | ,@(if use-agent '("--use-agent") |
67 | (if passphrase '("--passphrase-fd" "0"))) | |
30ceaa68 RF |
68 | "--yes" ; overwrite |
69 | "--output" ,output-file-name | |
70 | ,@pgg-gpg-extra-args ,@args)) | |
71 | (output-buffer pgg-output-buffer) | |
72 | (errors-buffer pgg-errors-buffer) | |
276e2740 | 73 | (orig-mode (default-file-modes)) |
30ceaa68 | 74 | (process-connection-type nil) |
8fbdffe5 MB |
75 | (inhibit-redisplay t) |
76 | process status exit-status | |
77 | passphrase-with-newline | |
78 | encoded-passphrase-with-new-line) | |
30ceaa68 RF |
79 | (with-current-buffer (get-buffer-create errors-buffer) |
80 | (buffer-disable-undo) | |
81 | (erase-buffer)) | |
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82 | (unwind-protect |
83 | (progn | |
84 | (set-default-file-modes 448) | |
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85 | (let ((coding-system-for-write 'binary)) |
86 | (setq process | |
87 | (apply #'start-process "*GnuPG*" errors-buffer | |
88 | program args))) | |
89 | (set-process-sentinel process #'ignore) | |
90 | (when passphrase | |
8fbdffe5 | 91 | (setq passphrase-with-newline (concat passphrase "\n")) |
31a7c2ff | 92 | (if pgg-passphrase-coding-system |
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93 | (progn |
94 | (setq encoded-passphrase-with-new-line | |
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95 | (encode-coding-string |
96 | passphrase-with-newline | |
97 | (coding-system-change-eol-conversion | |
98 | pgg-passphrase-coding-system 'unix))) | |
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99 | (pgg-clear-string passphrase-with-newline)) |
100 | (setq encoded-passphrase-with-new-line passphrase-with-newline | |
101 | passphrase-with-newline nil)) | |
102 | (process-send-string process encoded-passphrase-with-new-line)) | |
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103 | (process-send-region process start end) |
104 | (process-send-eof process) | |
105 | (while (eq 'run (process-status process)) | |
106 | (accept-process-output process 5)) | |
bdf49c67 CY |
107 | ;; Accept any remaining pending output coming after the |
108 | ;; status change. | |
109 | (accept-process-output process 5) | |
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110 | (setq status (process-status process) |
111 | exit-status (process-exit-status process)) | |
112 | (delete-process process) | |
30ceaa68 RF |
113 | (with-current-buffer (get-buffer-create output-buffer) |
114 | (buffer-disable-undo) | |
115 | (erase-buffer) | |
116 | (if (file-exists-p output-file-name) | |
bd707233 SJ |
117 | (let ((coding-system-for-read (if pgg-text-mode |
118 | 'raw-text | |
119 | 'binary))) | |
30ceaa68 RF |
120 | (insert-file-contents output-file-name))) |
121 | (set-buffer errors-buffer) | |
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122 | (if (memq status '(stop signal)) |
123 | (error "%s exited abnormally: '%s'" program exit-status)) | |
124 | (if (= 127 exit-status) | |
125 | (error "%s could not be found" program)))) | |
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126 | (if passphrase-with-newline |
127 | (pgg-clear-string passphrase-with-newline)) | |
128 | (if encoded-passphrase-with-new-line | |
129 | (pgg-clear-string encoded-passphrase-with-new-line)) | |
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130 | (if (and process (eq 'run (process-status process))) |
131 | (interrupt-process process)) | |
30ceaa68 RF |
132 | (if (file-exists-p output-file-name) |
133 | (delete-file output-file-name)) | |
134 | (set-default-file-modes orig-mode)))) | |
135 | ||
136 | (defun pgg-gpg-possibly-cache-passphrase (passphrase &optional key notruncate) | |
60c6189d RS |
137 | (if (and passphrase |
138 | pgg-cache-passphrase | |
30ceaa68 RF |
139 | (progn |
140 | (goto-char (point-min)) | |
141 | (re-search-forward "^\\[GNUPG:] \\(GOOD_PASSPHRASE\\>\\)\\|\\(SIG_CREATED\\)" nil t))) | |
142 | (pgg-add-passphrase-to-cache | |
143 | (or key | |
144 | (progn | |
145 | (goto-char (point-min)) | |
146 | (if (re-search-forward | |
147 | "^\\[GNUPG:] NEED_PASSPHRASE\\(_PIN\\)? \\w+ ?\\w*" nil t) | |
148 | (substring (match-string 0) -8)))) | |
149 | passphrase | |
150 | notruncate))) | |
151 | ||
152 | (defvar pgg-gpg-all-secret-keys 'unknown) | |
153 | ||
154 | (defun pgg-gpg-lookup-all-secret-keys () | |
155 | "Return all secret keys present in secret key ring." | |
156 | (when (eq pgg-gpg-all-secret-keys 'unknown) | |
157 | (setq pgg-gpg-all-secret-keys '()) | |
158 | (let ((args (list "--with-colons" "--no-greeting" "--batch" | |
159 | "--list-secret-keys"))) | |
160 | (with-temp-buffer | |
161 | (apply #'call-process pgg-gpg-program nil t nil args) | |
162 | (goto-char (point-min)) | |
163 | (while (re-search-forward | |
164 | "^\\(sec\\|pub\\):[^:]*:[^:]*:[^:]*:\\([^:]*\\)" nil t) | |
165 | (push (substring (match-string 2) 8) | |
166 | pgg-gpg-all-secret-keys))))) | |
167 | pgg-gpg-all-secret-keys) | |
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168 | |
169 | (defun pgg-gpg-lookup-key (string &optional type) | |
170 | "Search keys associated with STRING." | |
171 | (let ((args (list "--with-colons" "--no-greeting" "--batch" | |
172 | (if type "--list-secret-keys" "--list-keys") | |
173 | string))) | |
174 | (with-temp-buffer | |
175 | (apply #'call-process pgg-gpg-program nil t nil args) | |
176 | (goto-char (point-min)) | |
177 | (if (re-search-forward "^\\(sec\\|pub\\):[^:]*:[^:]*:[^:]*:\\([^:]*\\)" | |
178 | nil t) | |
179 | (substring (match-string 2) 8))))) | |
180 | ||
30ceaa68 RF |
181 | (defun pgg-gpg-lookup-key-owner (string &optional all) |
182 | "Search keys associated with STRING and return owner of identified key. | |
183 | ||
184 | The value may be just the bare key id, or it may be a combination of the | |
185 | user name associated with the key and the key id, with the key id enclosed | |
186 | in \"<...>\" angle brackets. | |
187 | ||
188 | Optional ALL non-nil means search all keys, including secret keys." | |
189 | (let ((args (list "--with-colons" "--no-greeting" "--batch" | |
190 | (if all "--list-secret-keys" "--list-keys") | |
191 | string)) | |
f91e3313 | 192 | (key-regexp (concat "^\\(sec\\|pub\\|uid\\)" |
30ceaa68 | 193 | ":[^:]*:[^:]*:[^:]*:\\([^:]*\\):[^:]*" |
f91e3313 | 194 | ":[^:]*:[^:]*:[^:]*:\\([^:]+\\):"))) |
30ceaa68 RF |
195 | (with-temp-buffer |
196 | (apply #'call-process pgg-gpg-program nil t nil args) | |
197 | (goto-char (point-min)) | |
198 | (if (re-search-forward key-regexp | |
199 | nil t) | |
200 | (match-string 3))))) | |
201 | ||
202 | (defun pgg-gpg-key-id-from-key-owner (key-owner) | |
203 | (cond ((not key-owner) nil) | |
204 | ;; Extract bare key id from outermost paired angle brackets, if any: | |
205 | ((string-match "[^<]*<\\(.+\\)>[^>]*" key-owner) | |
206 | (substring key-owner (match-beginning 1)(match-end 1))) | |
207 | (key-owner))) | |
208 | ||
df570e6f | 209 | (defun pgg-gpg-encrypt-region (start end recipients &optional sign passphrase) |
23f87bed | 210 | "Encrypt the current region between START and END. |
df570e6f | 211 | |
30ceaa68 RF |
212 | If optional argument SIGN is non-nil, do a combined sign and encrypt. |
213 | ||
214 | If optional PASSPHRASE is not specified, it will be obtained from the | |
215 | passphrase cache or user." | |
23f87bed | 216 | (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id)) |
30ceaa68 | 217 | (passphrase (or passphrase |
60c6189d | 218 | (when (and sign (not (pgg-gpg-use-agent-p))) |
30ceaa68 RF |
219 | (pgg-read-passphrase |
220 | (format "GnuPG passphrase for %s: " | |
221 | pgg-gpg-user-id) | |
222 | pgg-gpg-user-id)))) | |
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223 | (args |
224 | (append | |
30ceaa68 RF |
225 | (list "--batch" "--armor" "--always-trust" "--encrypt") |
226 | (if pgg-text-mode (list "--textmode")) | |
23f87bed | 227 | (if sign (list "--sign" "--local-user" pgg-gpg-user-id)) |
bb4c0f16 | 228 | (if (or recipients pgg-encrypt-for-me) |
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229 | (apply #'nconc |
230 | (mapcar (lambda (rcpt) | |
231 | (list pgg-gpg-recipient-argument rcpt)) | |
232 | (append recipients | |
233 | (if pgg-encrypt-for-me | |
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234 | (list pgg-gpg-user-id))))))))) |
235 | (pgg-gpg-process-region start end passphrase pgg-gpg-program args) | |
236 | (when sign | |
237 | (with-current-buffer pgg-errors-buffer | |
238 | ;; Possibly cache passphrase under, e.g. "jas", for future sign. | |
239 | (pgg-gpg-possibly-cache-passphrase passphrase pgg-gpg-user-id) | |
240 | ;; Possibly cache passphrase under, e.g. B565716F, for future decrypt. | |
241 | (pgg-gpg-possibly-cache-passphrase passphrase))) | |
242 | (pgg-process-when-success))) | |
23f87bed | 243 | |
df570e6f | 244 | (defun pgg-gpg-encrypt-symmetric-region (start end &optional passphrase) |
30ceaa68 RF |
245 | "Encrypt the current region between START and END with symmetric cipher. |
246 | ||
247 | If optional PASSPHRASE is not specified, it will be obtained from the | |
248 | passphrase cache or user." | |
249 | (let* ((passphrase (or passphrase | |
60c6189d RS |
250 | (when (not (pgg-gpg-use-agent-p)) |
251 | (pgg-read-passphrase | |
252 | "GnuPG passphrase for symmetric encryption: ")))) | |
30ceaa68 RF |
253 | (args |
254 | (append (list "--batch" "--armor" "--symmetric" ) | |
255 | (if pgg-text-mode (list "--textmode"))))) | |
256 | (pgg-gpg-process-region start end passphrase pgg-gpg-program args) | |
257 | (pgg-process-when-success))) | |
df570e6f EZ |
258 | |
259 | (defun pgg-gpg-decrypt-region (start end &optional passphrase) | |
30ceaa68 RF |
260 | "Decrypt the current region between START and END. |
261 | ||
262 | If optional PASSPHRASE is not specified, it will be obtained from the | |
263 | passphrase cache or user." | |
264 | (let* ((current-buffer (current-buffer)) | |
265 | (message-keys (with-temp-buffer | |
266 | (insert-buffer-substring current-buffer) | |
267 | (pgg-decode-armor-region (point-min) (point-max)))) | |
268 | (secret-keys (pgg-gpg-lookup-all-secret-keys)) | |
269 | ;; XXX the user is stuck if they need to use the passphrase for | |
270 | ;; any but the first secret key for which the message is | |
271 | ;; encrypted. ideally, we would incrementally give them a | |
272 | ;; chance with subsequent keys each time they fail with one. | |
273 | (key (pgg-gpg-select-matching-key message-keys secret-keys)) | |
274 | (key-owner (and key (pgg-gpg-lookup-key-owner key t))) | |
275 | (key-id (pgg-gpg-key-id-from-key-owner key-owner)) | |
276 | (pgg-gpg-user-id (or key-id key | |
277 | pgg-gpg-user-id pgg-default-user-id)) | |
278 | (passphrase (or passphrase | |
60c6189d RS |
279 | (when (not (pgg-gpg-use-agent-p)) |
280 | (pgg-read-passphrase | |
281 | (format (if (pgg-gpg-symmetric-key-p message-keys) | |
282 | "Passphrase for symmetric decryption: " | |
283 | "GnuPG passphrase for %s: ") | |
284 | (or key-owner "??")) | |
285 | pgg-gpg-user-id)))) | |
30ceaa68 RF |
286 | (args '("--batch" "--decrypt"))) |
287 | (pgg-gpg-process-region start end passphrase pgg-gpg-program args) | |
288 | (with-current-buffer pgg-errors-buffer | |
289 | (pgg-gpg-possibly-cache-passphrase passphrase pgg-gpg-user-id) | |
290 | (goto-char (point-min)) | |
291 | (re-search-forward "^\\[GNUPG:] DECRYPTION_OKAY\\>" nil t)))) | |
292 | ||
293 | ;;;###autoload | |
294 | (defun pgg-gpg-symmetric-key-p (message-keys) | |
295 | "True if decoded armor MESSAGE-KEYS has symmetric encryption indicator." | |
296 | (let (result) | |
297 | (dolist (key message-keys result) | |
298 | (when (and (eq (car key) 3) | |
299 | (member '(symmetric-key-algorithm) key)) | |
300 | (setq result key))))) | |
301 | ||
302 | (defun pgg-gpg-select-matching-key (message-keys secret-keys) | |
303 | "Choose a key from MESSAGE-KEYS that matches one of the keys in SECRET-KEYS." | |
304 | (loop for message-key in message-keys | |
305 | for message-key-id = (and (equal (car message-key) 1) | |
306 | (cdr (assq 'key-identifier | |
307 | (cdr message-key)))) | |
308 | for key = (and message-key-id (pgg-lookup-key message-key-id 'encrypt)) | |
309 | when (and key (member key secret-keys)) return key)) | |
23f87bed | 310 | |
df570e6f | 311 | (defun pgg-gpg-sign-region (start end &optional cleartext passphrase) |
23f87bed MB |
312 | "Make detached signature from text between START and END." |
313 | (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id)) | |
30ceaa68 | 314 | (passphrase (or passphrase |
60c6189d RS |
315 | (when (not (pgg-gpg-use-agent-p)) |
316 | (pgg-read-passphrase | |
317 | (format "GnuPG passphrase for %s: " | |
318 | pgg-gpg-user-id) | |
319 | pgg-gpg-user-id)))) | |
23f87bed | 320 | (args |
34128042 | 321 | (append (list (if cleartext "--clearsign" "--detach-sign") |
30ceaa68 | 322 | "--armor" "--batch" "--verbose" |
34128042 | 323 | "--local-user" pgg-gpg-user-id) |
30ceaa68 RF |
324 | (if pgg-text-mode (list "--textmode")))) |
325 | (inhibit-read-only t) | |
326 | buffer-read-only) | |
327 | (pgg-gpg-process-region start end passphrase pgg-gpg-program args) | |
328 | (with-current-buffer pgg-errors-buffer | |
329 | ;; Possibly cache passphrase under, e.g. "jas", for future sign. | |
330 | (pgg-gpg-possibly-cache-passphrase passphrase pgg-gpg-user-id) | |
331 | ;; Possibly cache passphrase under, e.g. B565716F, for future decrypt. | |
332 | (pgg-gpg-possibly-cache-passphrase passphrase)) | |
333 | (pgg-process-when-success))) | |
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334 | |
335 | (defun pgg-gpg-verify-region (start end &optional signature) | |
336 | "Verify region between START and END as the detached signature SIGNATURE." | |
30ceaa68 | 337 | (let ((args '("--batch" "--verify"))) |
23f87bed MB |
338 | (when (stringp signature) |
339 | (setq args (append args (list signature)))) | |
30ceaa68 RF |
340 | (setq args (append args '("-"))) |
341 | (pgg-gpg-process-region start end nil pgg-gpg-program args) | |
342 | (with-current-buffer pgg-errors-buffer | |
343 | (goto-char (point-min)) | |
344 | (while (re-search-forward "^gpg: \\(.*\\)\n" nil t) | |
345 | (with-current-buffer pgg-output-buffer | |
346 | (insert-buffer-substring pgg-errors-buffer | |
347 | (match-beginning 1) (match-end 0))) | |
348 | (delete-region (match-beginning 0) (match-end 0))) | |
349 | (goto-char (point-min)) | |
350 | (re-search-forward "^\\[GNUPG:] GOODSIG\\>" nil t)))) | |
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351 | |
352 | (defun pgg-gpg-insert-key () | |
353 | "Insert public key at point." | |
354 | (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id)) | |
30ceaa68 RF |
355 | (args (list "--batch" "--export" "--armor" |
356 | pgg-gpg-user-id))) | |
357 | (pgg-gpg-process-region (point)(point) nil pgg-gpg-program args) | |
23f87bed MB |
358 | (insert-buffer-substring pgg-output-buffer))) |
359 | ||
360 | (defun pgg-gpg-snarf-keys-region (start end) | |
361 | "Add all public keys in region between START and END to the keyring." | |
30ceaa68 RF |
362 | (let ((args '("--import" "--batch" "-")) status) |
363 | (pgg-gpg-process-region start end nil pgg-gpg-program args) | |
364 | (set-buffer pgg-errors-buffer) | |
365 | (goto-char (point-min)) | |
366 | (when (re-search-forward "^\\[GNUPG:] IMPORT_RES\\>" nil t) | |
367 | (setq status (buffer-substring (match-end 0) | |
368 | (progn (end-of-line)(point))) | |
369 | status (vconcat (mapcar #'string-to-number (split-string status)))) | |
370 | (erase-buffer) | |
371 | (insert (format "Imported %d key(s). | |
372 | \tArmor contains %d key(s) [%d bad, %d old].\n" | |
373 | (+ (aref status 2) | |
374 | (aref status 10)) | |
375 | (aref status 0) | |
376 | (aref status 1) | |
377 | (+ (aref status 4) | |
378 | (aref status 11))) | |
379 | (if (zerop (aref status 9)) | |
380 | "" | |
381 | "\tSecret keys are imported.\n"))) | |
382 | (append-to-buffer pgg-output-buffer (point-min)(point-max)) | |
383 | (pgg-process-when-success))) | |
4803386d | 384 | |
60c6189d RS |
385 | (defun pgg-gpg-update-agent () |
386 | "Try to connet to gpg-agent and send UPDATESTARTUPTTY." | |
387 | (if (fboundp 'make-network-process) | |
388 | (let* ((agent-info (getenv "GPG_AGENT_INFO")) | |
389 | (socket (and agent-info | |
390 | (string-match "^\\([^:]*\\)" agent-info) | |
391 | (match-string 1 agent-info))) | |
392 | (conn (and socket | |
393 | (make-network-process :name "gpg-agent-process" | |
394 | :host 'local :family 'local | |
395 | :service socket)))) | |
396 | (when (and conn (eq (process-status conn) 'open)) | |
397 | (process-send-string conn "UPDATESTARTUPTTY\n") | |
398 | (delete-process conn) | |
399 | t)) | |
400 | ;; We can't check, so assume gpg-agent is up. | |
401 | t)) | |
402 | ||
403 | (defun pgg-gpg-use-agent-p () | |
404 | "Return t if `pgg-gpg-use-agent' is t and gpg-agent is available." | |
405 | (and pgg-gpg-use-agent (pgg-gpg-update-agent))) | |
406 | ||
23f87bed MB |
407 | (provide 'pgg-gpg) |
408 | ||
cbee283d | 409 | ;; arch-tag: 2aa5d5d8-93a0-4865-9312-33e29830e000 |
23f87bed | 410 | ;;; pgg-gpg.el ends here |