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revision 1.1 by schwab, Thu Jul 22 16:45:51 2004 UTC revision 1.2 by miles, Sat Sep 4 13:13:43 2004 UTC
# Line 0  Line 1 
1    ;;; pgg-pgp.el --- PGP 2.* and 6.* support for PGG.
2    
3    ;; Copyright (C) 1999, 2000, 2003 Free Software Foundation, Inc.
4    
5    ;; Author: Daiki Ueno <ueno@unixuser.org>
6    ;; Created: 1999/11/02
7    ;; Keywords: PGP, OpenPGP
8    
9    ;; This file is part of GNU Emacs.
10    
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 2, or (at your option)
14    ;; any later version.
15    
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.
20    
21    ;; You should have received a copy of the GNU General Public License
22    ;; along with GNU Emacs; see the file COPYING.  If not, write to the
23    ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24    ;; Boston, MA 02111-1307, USA.
25    
26    ;;; Code:
27    
28    (eval-when-compile
29      (require 'cl)                         ; for pgg macros
30      (require 'pgg))
31    
32    (defgroup pgg-pgp ()
33      "PGP 2.* and 6.* interface"
34      :group 'pgg)
35    
36    (defcustom pgg-pgp-program "pgp"
37      "PGP 2.* and 6.* executable."
38      :group 'pgg-pgp
39      :type 'string)
40    
41    (defcustom pgg-pgp-shell-file-name "/bin/sh"
42      "File name to load inferior shells from.
43    Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"."
44      :group 'pgg-pgp
45      :type 'string)
46    
47    (defcustom pgg-pgp-shell-command-switch "-c"
48      "Switch used to have the shell execute its command line argument."
49      :group 'pgg-pgp
50      :type 'string)
51    
52    (defcustom pgg-pgp-extra-args nil
53      "Extra arguments for every PGP invocation."
54      :group 'pgg-pgp
55      :type '(choice
56              (const :tag "None" nil)
57              (string :tag "Arguments")))
58    
59    (defvar pgg-pgp-user-id nil
60      "PGP ID of your default identity.")
61    
62    (defun pgg-pgp-process-region (start end passphrase program args)
63      (let* ((errors-file-name (pgg-make-temp-file "pgg-errors"))
64             (args
65              (append args
66                      pgg-pgp-extra-args
67                      (list (concat "2>" errors-file-name))))
68             (shell-file-name pgg-pgp-shell-file-name)
69             (shell-command-switch pgg-pgp-shell-command-switch)
70             (process-environment process-environment)
71             (output-buffer pgg-output-buffer)
72             (errors-buffer pgg-errors-buffer)
73             (process-connection-type nil)
74             process status exit-status)
75        (with-current-buffer (get-buffer-create output-buffer)
76          (buffer-disable-undo)
77          (erase-buffer))
78        (when passphrase
79          (setenv "PGPPASSFD" "0"))
80        (unwind-protect
81            (progn
82              (let ((coding-system-for-read 'binary)
83                    (coding-system-for-write 'binary))
84                (setq process
85                      (apply #'funcall
86                             #'start-process-shell-command "*PGP*" output-buffer
87                             program args)))
88              (set-process-sentinel process #'ignore)
89              (when passphrase
90                (process-send-string process (concat passphrase "\n")))
91              (process-send-region process start end)
92              (process-send-eof process)
93              (while (eq 'run (process-status process))
94                (accept-process-output process 5))
95              (setq status (process-status process)
96                    exit-status (process-exit-status process))
97              (delete-process process)
98              (with-current-buffer output-buffer
99                (pgg-convert-lbt-region (point-min)(point-max) 'LF)
100    
101                (if (memq status '(stop signal))
102                    (error "%s exited abnormally: '%s'" program exit-status))
103                (if (= 127 exit-status)
104                    (error "%s could not be found" program))
105    
106                (set-buffer (get-buffer-create errors-buffer))
107                (buffer-disable-undo)
108                (erase-buffer)
109                (insert-file-contents errors-file-name)))
110          (if (and process (eq 'run (process-status process)))
111              (interrupt-process process))
112          (condition-case nil
113              (delete-file errors-file-name)
114            (file-error nil)))))
115    
116    (defun pgg-pgp-lookup-key (string &optional type)
117      "Search keys associated with STRING."
118      (let ((args (list "+batchmode" "+language=en" "-kv" string)))
119        (with-current-buffer (get-buffer-create pgg-output-buffer)
120          (buffer-disable-undo)
121          (erase-buffer)
122          (apply #'call-process pgg-pgp-program nil t nil args)
123          (goto-char (point-min))
124          (cond
125           ((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
126            (buffer-substring (point)(+ 8 (point))))
127           ((re-search-forward "^Type" nil t);PGP 6.*
128            (beginning-of-line 2)
129            (substring
130             (nth 2 (split-string
131                     (buffer-substring (point)(progn (end-of-line) (point)))))
132             2))))))
133    
134    (defun pgg-pgp-encrypt-region (start end recipients)
135      "Encrypt the current region between START and END."
136      (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
137             (args
138              `("+encrypttoself=off +verbose=1" "+batchmode"
139                "+language=us" "-fate"
140                ,@(if recipients
141                      (mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
142                              (append recipients
143                                      (if pgg-encrypt-for-me
144                                          (list pgg-pgp-user-id))))))))
145        (pgg-pgp-process-region start end nil pgg-pgp-program args)
146        (pgg-process-when-success nil)))
147    
148    (defun pgg-pgp-decrypt-region (start end)
149      "Decrypt the current region between START and END."
150      (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
151             (passphrase
152              (pgg-read-passphrase
153               (format "PGP passphrase for %s: " pgg-pgp-user-id)
154               (pgg-pgp-lookup-key pgg-pgp-user-id 'encrypt)))
155             (args
156              '("+verbose=1" "+batchmode" "+language=us" "-f")))
157        (pgg-pgp-process-region start end passphrase pgg-pgp-program args)
158        (pgg-process-when-success nil)))
159    
160    (defun pgg-pgp-sign-region (start end &optional clearsign)
161      "Make detached signature from text between START and END."
162      (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
163             (passphrase
164              (pgg-read-passphrase
165               (format "PGP passphrase for %s: " pgg-pgp-user-id)
166               (pgg-pgp-lookup-key pgg-pgp-user-id 'sign)))
167             (args
168              (list (if clearsign "-fast" "-fbast")
169                    "+verbose=1" "+language=us" "+batchmode"
170                    "-u" pgg-pgp-user-id)))
171        (pgg-pgp-process-region start end passphrase pgg-pgp-program args)
172        (pgg-process-when-success
173          (goto-char (point-min))
174          (when (re-search-forward "^-+BEGIN PGP" nil t);XXX
175            (let ((packet
176                   (cdr (assq 2 (pgg-parse-armor-region
177                                 (progn (beginning-of-line 2)
178                                        (point))
179                                 (point-max))))))
180              (if pgg-cache-passphrase
181                  (pgg-add-passphrase-cache
182                   (cdr (assq 'key-identifier packet))
183                   passphrase)))))))
184    
185    (defun pgg-pgp-verify-region (start end &optional signature)
186      "Verify region between START and END as the detached signature SIGNATURE."
187      (let* ((orig-file (pgg-make-temp-file "pgg"))
188             (args '("+verbose=1" "+batchmode" "+language=us"))
189             (orig-mode (default-file-modes)))
190        (unwind-protect
191            (progn
192              (set-default-file-modes 448)
193              (let ((coding-system-for-write 'binary)
194                    jka-compr-compression-info-list jam-zcat-filename-list)
195                (write-region start end orig-file)))
196          (set-default-file-modes orig-mode))
197        (if (stringp signature)
198            (progn
199              (copy-file signature (setq signature (concat orig-file ".asc")))
200              (setq args (append args (list signature orig-file))))
201          (setq args (append args (list orig-file))))
202        (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
203        (delete-file orig-file)
204        (if signature (delete-file signature))
205        (pgg-process-when-success
206          (goto-char (point-min))
207          (let ((case-fold-search t))
208            (while (re-search-forward "^warning: " nil t)
209              (delete-region (match-beginning 0)
210                             (progn (beginning-of-line 2) (point)))))
211          (goto-char (point-min))
212          (when (re-search-forward "^\\.$" nil t)
213            (delete-region (point-min)
214                           (progn (beginning-of-line 2)
215                                  (point)))))))
216    
217    (defun pgg-pgp-insert-key ()
218      "Insert public key at point."
219      (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
220             (args
221              (list "+verbose=1" "+batchmode" "+language=us" "-kxaf"
222                    (concat "\"" pgg-pgp-user-id "\""))))
223        (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
224        (insert-buffer-substring pgg-output-buffer)))
225    
226    (defun pgg-pgp-snarf-keys-region (start end)
227      "Add all public keys in region between START and END to the keyring."
228      (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
229             (key-file (pgg-make-temp-file "pgg"))
230             (args
231              (list "+verbose=1" "+batchmode" "+language=us" "-kaf"
232                    key-file)))
233        (let ((coding-system-for-write 'raw-text-dos))
234          (write-region start end key-file))
235        (pgg-pgp-process-region start end nil pgg-pgp-program args)
236        (delete-file key-file)
237        (pgg-process-when-success nil)))
238    
239    (provide 'pgg-pgp)
240    
241    ;;; arch-tag: 076b7801-37b2-49a6-97c3-218fdecde33c
242    ;;; pgg-pgp.el ends here

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