|
4
|
1 ;;; tm-pgp.el --- tm-view internal methods for PGP.
|
|
|
2
|
|
16
|
3 ;; Copyright (C) 1995,1996,1997 MORIOKA Tomohiko
|
|
4
|
4
|
|
|
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
|
|
|
6 ;; Created: 1995/12/7
|
|
16
|
7 ;; Version: $Id: tm-pgp.el,v 1.4 1997/02/02 05:06:20 steve Exp $
|
|
4
|
8 ;; Keywords: mail, news, MIME, multimedia, PGP, security
|
|
|
9
|
|
|
10 ;; This file is part of tm (Tools for MIME).
|
|
|
11
|
|
|
12 ;; This program is free software; you can redistribute it and/or
|
|
|
13 ;; modify it under the terms of the GNU General Public License as
|
|
|
14 ;; published by the Free Software Foundation; either version 2, or (at
|
|
|
15 ;; your option) any later version.
|
|
|
16
|
|
|
17 ;; This program is distributed in the hope that it will be useful, but
|
|
|
18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
20 ;; General Public License for more details.
|
|
|
21
|
|
|
22 ;; You should have received a copy of the GNU General Public License
|
|
|
23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
|
|
|
24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
|
25 ;; Boston, MA 02111-1307, USA.
|
|
|
26
|
|
|
27 ;;; Commentary:
|
|
|
28
|
|
|
29 ;; This module is based on 2 drafts about PGP MIME integration:
|
|
|
30
|
|
16
|
31 ;; - RFC 2015: "MIME Security with Pretty Good Privacy (PGP)"
|
|
4
|
32 ;; by Michael Elkins <elkins@aero.org> (1996/6)
|
|
|
33 ;;
|
|
16
|
34 ;; - draft-kazu-pgp-mime-00.txt: "PGP MIME Integration"
|
|
|
35 ;; by Kazuhiko Yamamoto <kazu@is.aist-nara.ac.jp>
|
|
|
36 ;; (1995/10; expired)
|
|
4
|
37 ;;
|
|
16
|
38 ;; These drafts may be contrary to each other. You should decide
|
|
|
39 ;; which you support. (Maybe you should use PGP/MIME)
|
|
4
|
40
|
|
|
41 ;;; Code:
|
|
|
42
|
|
|
43 (require 'tm-play)
|
|
|
44
|
|
16
|
45 (defvar pgp-verify-function
|
|
|
46 'mc-verify "*PGP verify function.")
|
|
|
47
|
|
|
48 (defvar pgp-decrypt-function
|
|
|
49 'mc-decrypt "*PGP decrypt function.")
|
|
|
50
|
|
|
51 (defvar pgp-fetch-key-function
|
|
|
52 'mc-pgp-fetch-key "*PGP fetch key function.")
|
|
|
53
|
|
|
54 (defvar pgp-snarf-keys-function
|
|
|
55 'mc-snarf-keys "*PGP snarf keys function.")
|
|
|
56
|
|
|
57 (autoload pgp-verify-function "mc-toplev")
|
|
|
58 (autoload pgp-decrypt-function "mc-toplev")
|
|
|
59 (autoload pgp-fetch-key-function "mc-toplev")
|
|
|
60 (autoload pgp-snarf-keys-function "mc-toplev")
|
|
|
61
|
|
4
|
62
|
|
|
63 ;;; @ internal method for application/pgp
|
|
|
64 ;;;
|
|
|
65 ;;; It is based on draft-kazu-pgp-mime-00.txt
|
|
|
66
|
|
|
67 (defun mime-article/view-application/pgp (beg end cal)
|
|
|
68 (let* ((cnum (mime-article/point-content-number beg))
|
|
|
69 (cur-buf (current-buffer))
|
|
|
70 (new-name (format "%s-%s" (buffer-name) cnum))
|
|
|
71 (mother mime::article/preview-buffer)
|
|
|
72 (mode major-mode)
|
|
16
|
73 code-converter
|
|
|
74 (str (buffer-substring beg end))
|
|
|
75 )
|
|
4
|
76 (switch-to-buffer new-name)
|
|
|
77 (erase-buffer)
|
|
|
78 (insert str)
|
|
|
79 (cond ((progn
|
|
|
80 (goto-char (point-min))
|
|
|
81 (re-search-forward "^-+BEGIN PGP SIGNED MESSAGE-+$" nil t)
|
|
|
82 )
|
|
16
|
83 (funcall pgp-verify-function)
|
|
4
|
84 (goto-char (point-min))
|
|
|
85 (delete-region
|
|
|
86 (point-min)
|
|
|
87 (and
|
|
|
88 (re-search-forward "^-+BEGIN PGP SIGNED MESSAGE-+\n\n")
|
|
|
89 (match-end 0))
|
|
|
90 )
|
|
|
91 (delete-region
|
|
|
92 (and (re-search-forward "^-+BEGIN PGP SIGNATURE-+")
|
|
|
93 (match-beginning 0))
|
|
|
94 (point-max)
|
|
|
95 )
|
|
|
96 (goto-char (point-min))
|
|
|
97 (while (re-search-forward "^- -" nil t)
|
|
|
98 (replace-match "-")
|
|
|
99 )
|
|
|
100 (setq code-converter
|
|
|
101 (or
|
|
|
102 (cdr (assq mode mime-viewer/code-converter-alist))
|
|
|
103 (function mime-viewer/default-code-convert-region)))
|
|
|
104 )
|
|
|
105 ((progn
|
|
|
106 (goto-char (point-min))
|
|
|
107 (re-search-forward "^-+BEGIN PGP MESSAGE-+$" nil t)
|
|
|
108 )
|
|
16
|
109 (as-binary-process (funcall pgp-decrypt-function))
|
|
4
|
110 (goto-char (point-min))
|
|
|
111 (delete-region (point-min)
|
|
|
112 (and
|
|
|
113 (search-forward "\n\n")
|
|
|
114 (match-end 0)))
|
|
|
115 (setq code-converter (function mime-charset/decode-buffer))
|
|
|
116 ))
|
|
|
117 (setq major-mode 'mime/show-message-mode)
|
|
|
118 (setq mime::article/code-converter code-converter)
|
|
|
119 (mime/viewer-mode mother)
|
|
|
120 ))
|
|
|
121
|
|
|
122 (set-atype 'mime/content-decoding-condition
|
|
|
123 '((type . "application/pgp")
|
|
|
124 (method . mime-article/view-application/pgp)
|
|
|
125 ))
|
|
|
126
|
|
|
127 (set-atype 'mime/content-decoding-condition
|
|
|
128 '((type . "text/x-pgp")
|
|
|
129 (method . mime-article/view-application/pgp)
|
|
|
130 ))
|
|
|
131
|
|
|
132
|
|
|
133 ;;; @ Internal method for application/pgp-signature
|
|
|
134 ;;;
|
|
16
|
135 ;;; It is based on RFC 2015.
|
|
4
|
136
|
|
|
137 (defvar tm-pgp::default-language 'en
|
|
|
138 "*Symbol of language for pgp.
|
|
|
139 It should be ISO 639 2 letter language code such as en, ja, ...")
|
|
|
140
|
|
|
141 (defvar tm-pgp::good-signature-regexp-alist
|
|
|
142 '((en . "Good signature from user.*$"))
|
|
|
143 "Alist of language vs regexp to detect ``Good signature''.")
|
|
|
144
|
|
|
145 (defvar tm-pgp::key-expected-regexp-alist
|
|
|
146 '((en . "Key matching expected Key ID \\(\\S +\\) not found"))
|
|
|
147 "Alist of language vs regexp to detect ``Key expected''.")
|
|
|
148
|
|
|
149 (defun mime::article/call-pgp-to-check-signature (output-buffer orig-file)
|
|
|
150 (save-excursion
|
|
|
151 (set-buffer output-buffer)
|
|
|
152 (erase-buffer)
|
|
|
153 )
|
|
|
154 (let* ((lang (or tm-pgp::default-language 'en))
|
|
|
155 (status
|
|
|
156 (call-process-region (point-min)(point-max)
|
|
|
157 "pgp" nil output-buffer nil orig-file
|
|
|
158 (format "+language=%s" lang)
|
|
|
159 ))
|
|
|
160 (regexp (cdr (assq lang tm-pgp::good-signature-regexp-alist)))
|
|
|
161 )
|
|
|
162 (if (= status 0)
|
|
|
163 (save-excursion
|
|
|
164 (set-buffer output-buffer)
|
|
|
165 (goto-char (point-min))
|
|
|
166 (message
|
|
|
167 (cond ((not (stringp regexp))
|
|
|
168 "Please specify right regexp for specified language")
|
|
|
169 ((re-search-forward regexp nil t)
|
|
|
170 (buffer-substring (match-beginning 0) (match-end 0))
|
|
|
171 )
|
|
|
172 (t
|
|
|
173 "Bad signature"
|
|
|
174 )))
|
|
|
175 ))))
|
|
|
176
|
|
|
177 (defun mime-article/check-pgp-signature (beg end cal)
|
|
|
178 (let* ((encoding (cdr (assq 'encoding cal)))
|
|
|
179 (cnum (mime-article/point-content-number beg))
|
|
|
180 (rcnum (reverse cnum))
|
|
|
181 (rmcnum (cdr rcnum))
|
|
|
182 (knum (car rcnum))
|
|
|
183 (onum (if (> knum 0)
|
|
|
184 (1- knum)
|
|
|
185 (1+ knum)))
|
|
|
186 (oinfo (mime-article/rcnum-to-cinfo (cons onum rmcnum)
|
|
|
187 mime::article/content-info))
|
|
|
188 status str kbuf
|
|
|
189 (basename (expand-file-name "tm" mime/tmp-dir))
|
|
|
190 (orig-file (make-temp-name basename))
|
|
|
191 (sig-file (concat orig-file ".sig"))
|
|
|
192 )
|
|
|
193 (save-excursion
|
|
|
194 (setq str (buffer-substring
|
|
|
195 (mime::content-info/point-min oinfo)
|
|
|
196 (mime::content-info/point-max oinfo)
|
|
|
197 ))
|
|
|
198 (set-buffer (get-buffer-create mime/temp-buffer-name))
|
|
|
199 (insert str)
|
|
|
200 (goto-char (point-min))
|
|
|
201 (while (re-search-forward "\n" nil t)
|
|
|
202 (replace-match "\r\n")
|
|
|
203 )
|
|
16
|
204 (as-binary-output-file (write-file orig-file))
|
|
4
|
205 (kill-buffer (current-buffer))
|
|
|
206 )
|
|
|
207 (save-excursion
|
|
|
208 (mime-article/show-output-buffer)
|
|
|
209 )
|
|
|
210 (save-excursion
|
|
|
211 (setq str (buffer-substring
|
|
|
212 (save-excursion
|
|
|
213 (goto-char beg)
|
|
|
214 (and (search-forward "\n\n")
|
|
|
215 (match-end 0)))
|
|
|
216 end))
|
|
|
217 (set-buffer (setq kbuf (get-buffer-create mime/temp-buffer-name)))
|
|
|
218 (insert str)
|
|
|
219 (mime-decode-region (point-min)(point-max) encoding)
|
|
16
|
220 (as-binary-output-file (write-file sig-file))
|
|
4
|
221 (or (mime::article/call-pgp-to-check-signature
|
|
|
222 mime/output-buffer-name orig-file)
|
|
|
223 (let (pgp-id)
|
|
|
224 (save-excursion
|
|
|
225 (set-buffer mime/output-buffer-name)
|
|
|
226 (goto-char (point-min))
|
|
|
227 (let ((regexp (cdr (assq (or tm-pgp::default-language 'en)
|
|
|
228 tm-pgp::key-expected-regexp-alist))))
|
|
|
229 (cond ((not (stringp regexp))
|
|
|
230 (message
|
|
|
231 "Please specify right regexp for specified language")
|
|
|
232 )
|
|
|
233 ((re-search-forward regexp nil t)
|
|
|
234 (setq pgp-id
|
|
|
235 (concat "0x" (buffer-substring-no-properties
|
|
|
236 (match-beginning 1)
|
|
|
237 (match-end 1))))
|
|
|
238 ))))
|
|
|
239 (if (and pgp-id
|
|
|
240 (y-or-n-p
|
|
|
241 (format "Key %s not found; attempt to fetch? " pgp-id))
|
|
|
242 )
|
|
|
243 (progn
|
|
16
|
244 (funcall pgp-fetch-key-function (cons nil pgp-id))
|
|
4
|
245 (mime::article/call-pgp-to-check-signature
|
|
|
246 mime/output-buffer-name orig-file)
|
|
|
247 ))
|
|
|
248 ))
|
|
|
249 (let ((other-window-scroll-buffer mime/output-buffer-name))
|
|
|
250 (scroll-other-window 8)
|
|
|
251 )
|
|
|
252 (kill-buffer kbuf)
|
|
|
253 (delete-file orig-file)
|
|
|
254 (delete-file sig-file)
|
|
|
255 )))
|
|
|
256
|
|
|
257 (set-atype 'mime/content-decoding-condition
|
|
|
258 '((type . "application/pgp-signature")
|
|
|
259 (method . mime-article/check-pgp-signature)
|
|
|
260 ))
|
|
|
261
|
|
|
262
|
|
|
263 ;;; @ Internal method for application/pgp-encrypted
|
|
|
264 ;;;
|
|
16
|
265 ;;; It is based on RFC 2015.
|
|
4
|
266
|
|
|
267 (defun mime-article/decrypt-pgp (beg end cal)
|
|
|
268 (let* ((cnum (mime-article/point-content-number beg))
|
|
|
269 (rcnum (reverse cnum))
|
|
|
270 (rmcnum (cdr rcnum))
|
|
|
271 (knum (car rcnum))
|
|
|
272 (onum (if (> knum 0)
|
|
|
273 (1- knum)
|
|
|
274 (1+ knum)))
|
|
|
275 (oinfo (mime-article/rcnum-to-cinfo (cons onum rmcnum)
|
|
|
276 mime::article/content-info))
|
|
|
277 (obeg (mime::content-info/point-min oinfo))
|
|
|
278 (oend (mime::content-info/point-max oinfo))
|
|
|
279 )
|
|
|
280 (mime-article/view-application/pgp obeg oend cal)
|
|
|
281 ))
|
|
|
282
|
|
|
283 (set-atype 'mime/content-decoding-condition
|
|
|
284 '((type . "application/pgp-encrypted")
|
|
|
285 (method . mime-article/decrypt-pgp)
|
|
|
286 ))
|
|
|
287
|
|
|
288
|
|
|
289 ;;; @ Internal method for application/pgp-keys
|
|
|
290 ;;;
|
|
16
|
291 ;;; It is based on RFC 2015.
|
|
4
|
292
|
|
|
293 (defun mime-article/add-pgp-keys (beg end cal)
|
|
|
294 (let* ((cnum (mime-article/point-content-number beg))
|
|
|
295 (cur-buf (current-buffer))
|
|
|
296 (new-name (format "%s-%s" (buffer-name) cnum))
|
|
|
297 (mother mime::article/preview-buffer)
|
|
|
298 (charset (cdr (assoc "charset" cal)))
|
|
|
299 (encoding (cdr (assq 'encoding cal)))
|
|
|
300 (mode major-mode)
|
|
|
301 str)
|
|
|
302 (setq str (buffer-substring beg end))
|
|
|
303 (switch-to-buffer new-name)
|
|
|
304 (setq buffer-read-only nil)
|
|
|
305 (erase-buffer)
|
|
|
306 (insert str)
|
|
|
307 (goto-char (point-min))
|
|
|
308 (if (re-search-forward "^\n" nil t)
|
|
|
309 (delete-region (point-min) (match-end 0))
|
|
|
310 )
|
|
|
311 (mime-decode-region (point-min)(point-max) encoding)
|
|
16
|
312 (funcall pgp-snarf-keys-function)
|
|
4
|
313 (kill-buffer (current-buffer))
|
|
|
314 ))
|
|
|
315
|
|
|
316 (set-atype 'mime/content-decoding-condition
|
|
|
317 '((type . "application/pgp-keys")
|
|
|
318 (method . mime-article/add-pgp-keys)
|
|
|
319 ))
|
|
|
320
|
|
|
321
|
|
|
322 ;;; @ end
|
|
|
323 ;;;
|
|
|
324
|
|
|
325 (provide 'tm-pgp)
|
|
|
326
|
|
|
327 (run-hooks 'tm-pgp-load-hook)
|
|
|
328
|
|
|
329 ;;; tm-pgp.el ends here
|
