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1 | ;;; mml-sec.el --- A package with security functions for MML documents |
2 | ;; Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. | |
3 | ||
4 | ;; Author: Simon Josefsson <simon@josefsson.org> | |
5 | ||
6 | ;; This file is part of GNU Emacs. | |
7 | ||
8 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
9 | ;; it under the terms of the GNU General Public License as published by | |
10 | ;; the Free Software Foundation; either version 2, or (at your option) | |
11 | ;; any later version. | |
12 | ||
13 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
14 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | ;; GNU General Public License for more details. | |
17 | ||
18 | ;; You should have received a copy of the GNU General Public License | |
19 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
20 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | ;; Boston, MA 02111-1307, USA. | |
22 | ||
23 | ;;; Commentary: | |
24 | ||
25 | ;;; Code: | |
26 | ||
27 | (require 'mml-smime) | |
28 | (eval-when-compile (require 'cl)) | |
29 | (autoload 'mml2015-sign "mml2015") | |
30 | (autoload 'mml2015-encrypt "mml2015") | |
31 | (autoload 'mml1991-sign "mml1991") | |
32 | (autoload 'mml1991-encrypt "mml1991") | |
33 | (autoload 'message-goto-body "message") | |
34 | (autoload 'mml-insert-tag "mml") | |
35 | ||
36 | (defvar mml-sign-alist | |
37 | '(("smime" mml-smime-sign-buffer mml-smime-sign-query) | |
38 | ("pgp" mml-pgp-sign-buffer list) | |
39 | ("pgpauto" mml-pgpauto-sign-buffer list) | |
40 | ("pgpmime" mml-pgpmime-sign-buffer list)) | |
41 | "Alist of MIME signer functions.") | |
42 | ||
43 | (defcustom mml-default-sign-method "pgpmime" | |
44 | "Default sign method. | |
45 | The string must have an entry in `mml-sign-alist'." | |
46 | :type '(choice (const "smime") | |
47 | (const "pgp") | |
48 | (const "pgpauto") | |
49 | (const "pgpmime") | |
50 | string) | |
51 | :group 'message) | |
52 | ||
53 | (defvar mml-encrypt-alist | |
54 | '(("smime" mml-smime-encrypt-buffer mml-smime-encrypt-query) | |
55 | ("pgp" mml-pgp-encrypt-buffer list) | |
56 | ("pgpauto" mml-pgpauto-sign-buffer list) | |
57 | ("pgpmime" mml-pgpmime-encrypt-buffer list)) | |
58 | "Alist of MIME encryption functions.") | |
59 | ||
60 | (defcustom mml-default-encrypt-method "pgpmime" | |
61 | "Default encryption method. | |
62 | The string must have an entry in `mml-encrypt-alist'." | |
63 | :type '(choice (const "smime") | |
64 | (const "pgp") | |
65 | (const "pgpauto") | |
66 | (const "pgpmime") | |
67 | string) | |
68 | :group 'message) | |
69 | ||
70 | (defcustom mml-signencrypt-style-alist | |
71 | '(("smime" separate) | |
72 | ("pgp" combined) | |
73 | ("pgpauto" combined) | |
74 | ("pgpmime" combined)) | |
75 | "Alist specifying if `signencrypt' results in two separate operations or not. | |
76 | The first entry indicates the MML security type, valid entries include | |
77 | the strings \"smime\", \"pgp\", and \"pgpmime\". The second entry is | |
78 | a symbol `separate' or `combined' where `separate' means that MML signs | |
79 | and encrypt messages in a two step process, and `combined' means that MML | |
80 | signs and encrypt the message in one step. | |
81 | ||
82 | Note that the output generated by using a `combined' mode is NOT | |
83 | understood by all PGP implementations, in particular PGP version | |
84 | 2 does not support it! See Info node `(message)Security' for | |
85 | details." | |
e79f14a4 | 86 | :group 'message |
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87 | :type '(repeat (list (choice (const :tag "S/MIME" "smime") |
88 | (const :tag "PGP" "pgp") | |
89 | (const :tag "PGP/MIME" "pgpmime") | |
90 | (string :tag "User defined")) | |
91 | (choice (const :tag "Separate" separate) | |
92 | (const :tag "Combined" combined))))) | |
93 | ||
94 | ;;; Configuration/helper functions | |
95 | ||
96 | (defun mml-signencrypt-style (method &optional style) | |
97 | "Function for setting/getting the signencrypt-style used. Takes two | |
98 | arguments, the method (e.g. \"pgp\") and optionally the mode | |
99 | \(e.g. combined). If the mode is omitted, the current value is returned. | |
100 | ||
101 | For example, if you prefer to use combined sign & encrypt with | |
102 | smime, putting the following in your Gnus startup file will | |
103 | enable that behavior: | |
104 | ||
105 | \(mml-set-signencrypt-style \"smime\" combined) | |
106 | ||
107 | You can also customize or set `mml-signencrypt-style-alist' instead." | |
108 | (let ((style-item (assoc method mml-signencrypt-style-alist))) | |
109 | (if style-item | |
110 | (if (or (eq style 'separate) | |
111 | (eq style 'combined)) | |
112 | ;; valid style setting? | |
113 | (setf (second style-item) style) | |
114 | ;; otherwise, just return the current value | |
115 | (second style-item)) | |
c1d7d285 | 116 | (message "Warning, attempt to set invalid signencrypt style")))) |
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117 | |
118 | ;;; Security functions | |
119 | ||
120 | (defun mml-smime-sign-buffer (cont) | |
121 | (or (mml-smime-sign cont) | |
122 | (error "Signing failed... inspect message logs for errors"))) | |
123 | ||
124 | (defun mml-smime-encrypt-buffer (cont &optional sign) | |
125 | (when sign | |
126 | (message "Combined sign and encrypt S/MIME not support yet") | |
127 | (sit-for 1)) | |
128 | (or (mml-smime-encrypt cont) | |
129 | (error "Encryption failed... inspect message logs for errors"))) | |
130 | ||
131 | (defun mml-pgp-sign-buffer (cont) | |
132 | (or (mml1991-sign cont) | |
133 | (error "Signing failed... inspect message logs for errors"))) | |
134 | ||
135 | (defun mml-pgp-encrypt-buffer (cont &optional sign) | |
136 | (or (mml1991-encrypt cont sign) | |
137 | (error "Encryption failed... inspect message logs for errors"))) | |
138 | ||
139 | (defun mml-pgpmime-sign-buffer (cont) | |
140 | (or (mml2015-sign cont) | |
141 | (error "Signing failed... inspect message logs for errors"))) | |
142 | ||
143 | (defun mml-pgpmime-encrypt-buffer (cont &optional sign) | |
144 | (or (mml2015-encrypt cont sign) | |
145 | (error "Encryption failed... inspect message logs for errors"))) | |
146 | ||
147 | (defun mml-pgpauto-sign-buffer (cont) | |
148 | (message-goto-body) | |
149 | (or (if (re-search-backward "Content-Type: *multipart/.*" nil t) ; there must be a better way... | |
150 | (mml2015-sign cont) | |
151 | (mml1991-sign cont)) | |
152 | (error "Encryption failed... inspect message logs for errors"))) | |
153 | ||
154 | (defun mml-pgpauto-encrypt-buffer (cont &optional sign) | |
155 | (message-goto-body) | |
156 | (or (if (re-search-backward "Content-Type: *multipart/.*" nil t) ; there must be a better way... | |
157 | (mml2015-encrypt cont sign) | |
158 | (mml1991-encrypt cont sign)) | |
159 | (error "Encryption failed... inspect message logs for errors"))) | |
160 | ||
161 | (defun mml-secure-part (method &optional sign) | |
162 | (save-excursion | |
163 | (let ((tags (funcall (nth 2 (assoc method (if sign mml-sign-alist | |
164 | mml-encrypt-alist)))))) | |
165 | (cond ((re-search-backward | |
166 | "<#\\(multipart\\|part\\|external\\|mml\\)" nil t) | |
167 | (goto-char (match-end 0)) | |
168 | (insert (if sign " sign=" " encrypt=") method) | |
169 | (while tags | |
170 | (let ((key (pop tags)) | |
171 | (value (pop tags))) | |
172 | (when value | |
173 | ;; Quote VALUE if it contains suspicious characters. | |
174 | (when (string-match "[\"'\\~/*;() \t\n]" value) | |
175 | (setq value (prin1-to-string value))) | |
176 | (insert (format " %s=%s" key value)))))) | |
177 | ((or (re-search-backward | |
178 | (concat "^" (regexp-quote mail-header-separator) "\n") nil t) | |
179 | (re-search-forward | |
180 | (concat "^" (regexp-quote mail-header-separator) "\n") nil t)) | |
181 | (goto-char (match-end 0)) | |
182 | (apply 'mml-insert-tag 'part (cons (if sign 'sign 'encrypt) | |
183 | (cons method tags)))) | |
184 | (t (error "The message is corrupted. No mail header separator")))))) | |
185 | ||
186 | (defun mml-secure-sign-pgp () | |
187 | "Add MML tags to PGP sign this MML part." | |
188 | (interactive) | |
189 | (mml-secure-part "pgp" 'sign)) | |
190 | ||
191 | (defun mml-secure-sign-pgpauto () | |
192 | "Add MML tags to PGP-auto sign this MML part." | |
193 | (interactive) | |
194 | (mml-secure-part "pgpauto" 'sign)) | |
195 | ||
196 | (defun mml-secure-sign-pgpmime () | |
197 | "Add MML tags to PGP/MIME sign this MML part." | |
198 | (interactive) | |
199 | (mml-secure-part "pgpmime" 'sign)) | |
200 | ||
201 | (defun mml-secure-sign-smime () | |
202 | "Add MML tags to S/MIME sign this MML part." | |
203 | (interactive) | |
204 | (mml-secure-part "smime" 'sign)) | |
205 | ||
206 | (defun mml-secure-encrypt-pgp () | |
207 | "Add MML tags to PGP encrypt this MML part." | |
208 | (interactive) | |
209 | (mml-secure-part "pgp")) | |
210 | ||
211 | (defun mml-secure-encrypt-pgpmime () | |
212 | "Add MML tags to PGP/MIME encrypt this MML part." | |
213 | (interactive) | |
214 | (mml-secure-part "pgpmime")) | |
215 | ||
216 | (defun mml-secure-encrypt-smime () | |
217 | "Add MML tags to S/MIME encrypt this MML part." | |
218 | (interactive) | |
219 | (mml-secure-part "smime")) | |
220 | ||
221 | ;; defuns that add the proper <#secure ...> tag to the top of the message body | |
222 | (defun mml-secure-message (method &optional modesym) | |
223 | (let ((mode (prin1-to-string modesym)) | |
224 | insert-loc) | |
225 | (mml-unsecure-message) | |
226 | (save-excursion | |
227 | (goto-char (point-min)) | |
228 | (cond ((re-search-forward | |
229 | (concat "^" (regexp-quote mail-header-separator) "\n") nil t) | |
230 | (goto-char (setq insert-loc (match-end 0))) | |
231 | (unless (looking-at "<#secure") | |
232 | (mml-insert-tag | |
233 | 'secure 'method method 'mode mode))) | |
234 | (t (error | |
235 | "The message is corrupted. No mail header separator")))) | |
236 | (when (eql insert-loc (point)) | |
237 | (forward-line 1)))) | |
238 | ||
239 | (defun mml-unsecure-message () | |
240 | "Remove security related MML tags from message." | |
241 | (interactive) | |
242 | (save-excursion | |
243 | (goto-char (point-max)) | |
244 | (when (re-search-backward "^<#secure.*>\n" nil t) | |
245 | (delete-region (match-beginning 0) (match-end 0))))) | |
246 | ||
247 | (defun mml-secure-message-sign-smime () | |
248 | "Add MML tag to encrypt/sign the entire message." | |
249 | (interactive) | |
250 | (mml-secure-message "smime" 'sign)) | |
251 | ||
252 | (defun mml-secure-message-sign-pgp () | |
253 | "Add MML tag to encrypt/sign the entire message." | |
254 | (interactive) | |
255 | (mml-secure-message "pgp" 'sign)) | |
256 | ||
257 | (defun mml-secure-message-sign-pgpmime () | |
258 | "Add MML tag to encrypt/sign the entire message." | |
259 | (interactive) | |
260 | (mml-secure-message "pgpmime" 'sign)) | |
261 | ||
262 | (defun mml-secure-message-sign-pgpauto () | |
263 | "Add MML tag to encrypt/sign the entire message." | |
264 | (interactive) | |
265 | (mml-secure-message "pgpauto" 'sign)) | |
266 | ||
267 | (defun mml-secure-message-encrypt-smime (&optional dontsign) | |
268 | "Add MML tag to encrypt and sign the entire message. | |
269 | If called with a prefix argument, only encrypt (do NOT sign)." | |
270 | (interactive "P") | |
271 | (mml-secure-message "smime" (if dontsign 'encrypt 'signencrypt))) | |
272 | ||
273 | (defun mml-secure-message-encrypt-pgp (&optional dontsign) | |
274 | "Add MML tag to encrypt and sign the entire message. | |
275 | If called with a prefix argument, only encrypt (do NOT sign)." | |
276 | (interactive "P") | |
277 | (mml-secure-message "pgp" (if dontsign 'encrypt 'signencrypt))) | |
278 | ||
279 | (defun mml-secure-message-encrypt-pgpmime (&optional dontsign) | |
280 | "Add MML tag to encrypt and sign the entire message. | |
281 | If called with a prefix argument, only encrypt (do NOT sign)." | |
282 | (interactive "P") | |
283 | (mml-secure-message "pgpmime" (if dontsign 'encrypt 'signencrypt))) | |
284 | ||
285 | (defun mml-secure-message-encrypt-pgpauto (&optional dontsign) | |
286 | "Add MML tag to encrypt and sign the entire message. | |
287 | If called with a prefix argument, only encrypt (do NOT sign)." | |
288 | (interactive "P") | |
289 | (mml-secure-message "pgpauto" (if dontsign 'encrypt 'signencrypt))) | |
290 | ||
291 | (provide 'mml-sec) | |
292 | ||
293 | ;;; arch-tag: 111c56e7-df5e-4287-87d7-93ed2911ec6c | |
294 | ;;; mml-sec.el ends here |