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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'." | |
bf247b6e | 46 | :version "22.1" |
23f87bed MB |
47 | :type '(choice (const "smime") |
48 | (const "pgp") | |
49 | (const "pgpauto") | |
50 | (const "pgpmime") | |
51 | string) | |
52 | :group 'message) | |
53 | ||
54 | (defvar mml-encrypt-alist | |
55 | '(("smime" mml-smime-encrypt-buffer mml-smime-encrypt-query) | |
56 | ("pgp" mml-pgp-encrypt-buffer list) | |
57 | ("pgpauto" mml-pgpauto-sign-buffer list) | |
58 | ("pgpmime" mml-pgpmime-encrypt-buffer list)) | |
59 | "Alist of MIME encryption functions.") | |
60 | ||
61 | (defcustom mml-default-encrypt-method "pgpmime" | |
62 | "Default encryption method. | |
63 | The string must have an entry in `mml-encrypt-alist'." | |
bf247b6e | 64 | :version "22.1" |
23f87bed MB |
65 | :type '(choice (const "smime") |
66 | (const "pgp") | |
67 | (const "pgpauto") | |
68 | (const "pgpmime") | |
69 | string) | |
70 | :group 'message) | |
71 | ||
72 | (defcustom mml-signencrypt-style-alist | |
73 | '(("smime" separate) | |
74 | ("pgp" combined) | |
75 | ("pgpauto" combined) | |
76 | ("pgpmime" combined)) | |
77 | "Alist specifying if `signencrypt' results in two separate operations or not. | |
78 | The first entry indicates the MML security type, valid entries include | |
79 | the strings \"smime\", \"pgp\", and \"pgpmime\". The second entry is | |
80 | a symbol `separate' or `combined' where `separate' means that MML signs | |
81 | and encrypt messages in a two step process, and `combined' means that MML | |
82 | signs and encrypt the message in one step. | |
83 | ||
84 | Note that the output generated by using a `combined' mode is NOT | |
85 | understood by all PGP implementations, in particular PGP version | |
86 | 2 does not support it! See Info node `(message)Security' for | |
87 | details." | |
bf247b6e | 88 | :version "22.1" |
e79f14a4 | 89 | :group 'message |
23f87bed MB |
90 | :type '(repeat (list (choice (const :tag "S/MIME" "smime") |
91 | (const :tag "PGP" "pgp") | |
92 | (const :tag "PGP/MIME" "pgpmime") | |
93 | (string :tag "User defined")) | |
94 | (choice (const :tag "Separate" separate) | |
95 | (const :tag "Combined" combined))))) | |
96 | ||
97 | ;;; Configuration/helper functions | |
98 | ||
99 | (defun mml-signencrypt-style (method &optional style) | |
100 | "Function for setting/getting the signencrypt-style used. Takes two | |
101 | arguments, the method (e.g. \"pgp\") and optionally the mode | |
102 | \(e.g. combined). If the mode is omitted, the current value is returned. | |
103 | ||
104 | For example, if you prefer to use combined sign & encrypt with | |
105 | smime, putting the following in your Gnus startup file will | |
106 | enable that behavior: | |
107 | ||
108 | \(mml-set-signencrypt-style \"smime\" combined) | |
109 | ||
110 | You can also customize or set `mml-signencrypt-style-alist' instead." | |
111 | (let ((style-item (assoc method mml-signencrypt-style-alist))) | |
112 | (if style-item | |
113 | (if (or (eq style 'separate) | |
114 | (eq style 'combined)) | |
115 | ;; valid style setting? | |
116 | (setf (second style-item) style) | |
117 | ;; otherwise, just return the current value | |
118 | (second style-item)) | |
c1d7d285 | 119 | (message "Warning, attempt to set invalid signencrypt style")))) |
23f87bed MB |
120 | |
121 | ;;; Security functions | |
122 | ||
123 | (defun mml-smime-sign-buffer (cont) | |
124 | (or (mml-smime-sign cont) | |
125 | (error "Signing failed... inspect message logs for errors"))) | |
126 | ||
127 | (defun mml-smime-encrypt-buffer (cont &optional sign) | |
128 | (when sign | |
129 | (message "Combined sign and encrypt S/MIME not support yet") | |
130 | (sit-for 1)) | |
131 | (or (mml-smime-encrypt cont) | |
132 | (error "Encryption failed... inspect message logs for errors"))) | |
133 | ||
134 | (defun mml-pgp-sign-buffer (cont) | |
135 | (or (mml1991-sign cont) | |
136 | (error "Signing failed... inspect message logs for errors"))) | |
137 | ||
138 | (defun mml-pgp-encrypt-buffer (cont &optional sign) | |
139 | (or (mml1991-encrypt cont sign) | |
140 | (error "Encryption failed... inspect message logs for errors"))) | |
141 | ||
142 | (defun mml-pgpmime-sign-buffer (cont) | |
143 | (or (mml2015-sign cont) | |
144 | (error "Signing failed... inspect message logs for errors"))) | |
145 | ||
146 | (defun mml-pgpmime-encrypt-buffer (cont &optional sign) | |
147 | (or (mml2015-encrypt cont sign) | |
148 | (error "Encryption failed... inspect message logs for errors"))) | |
149 | ||
150 | (defun mml-pgpauto-sign-buffer (cont) | |
151 | (message-goto-body) | |
152 | (or (if (re-search-backward "Content-Type: *multipart/.*" nil t) ; there must be a better way... | |
153 | (mml2015-sign cont) | |
154 | (mml1991-sign cont)) | |
155 | (error "Encryption failed... inspect message logs for errors"))) | |
156 | ||
157 | (defun mml-pgpauto-encrypt-buffer (cont &optional sign) | |
158 | (message-goto-body) | |
159 | (or (if (re-search-backward "Content-Type: *multipart/.*" nil t) ; there must be a better way... | |
160 | (mml2015-encrypt cont sign) | |
161 | (mml1991-encrypt cont sign)) | |
162 | (error "Encryption failed... inspect message logs for errors"))) | |
163 | ||
164 | (defun mml-secure-part (method &optional sign) | |
165 | (save-excursion | |
166 | (let ((tags (funcall (nth 2 (assoc method (if sign mml-sign-alist | |
167 | mml-encrypt-alist)))))) | |
168 | (cond ((re-search-backward | |
169 | "<#\\(multipart\\|part\\|external\\|mml\\)" nil t) | |
170 | (goto-char (match-end 0)) | |
171 | (insert (if sign " sign=" " encrypt=") method) | |
172 | (while tags | |
173 | (let ((key (pop tags)) | |
174 | (value (pop tags))) | |
175 | (when value | |
176 | ;; Quote VALUE if it contains suspicious characters. | |
177 | (when (string-match "[\"'\\~/*;() \t\n]" value) | |
178 | (setq value (prin1-to-string value))) | |
179 | (insert (format " %s=%s" key value)))))) | |
180 | ((or (re-search-backward | |
181 | (concat "^" (regexp-quote mail-header-separator) "\n") nil t) | |
182 | (re-search-forward | |
183 | (concat "^" (regexp-quote mail-header-separator) "\n") nil t)) | |
184 | (goto-char (match-end 0)) | |
185 | (apply 'mml-insert-tag 'part (cons (if sign 'sign 'encrypt) | |
186 | (cons method tags)))) | |
187 | (t (error "The message is corrupted. No mail header separator")))))) | |
188 | ||
189 | (defun mml-secure-sign-pgp () | |
190 | "Add MML tags to PGP sign this MML part." | |
191 | (interactive) | |
192 | (mml-secure-part "pgp" 'sign)) | |
193 | ||
194 | (defun mml-secure-sign-pgpauto () | |
195 | "Add MML tags to PGP-auto sign this MML part." | |
196 | (interactive) | |
197 | (mml-secure-part "pgpauto" 'sign)) | |
198 | ||
199 | (defun mml-secure-sign-pgpmime () | |
200 | "Add MML tags to PGP/MIME sign this MML part." | |
201 | (interactive) | |
202 | (mml-secure-part "pgpmime" 'sign)) | |
203 | ||
204 | (defun mml-secure-sign-smime () | |
205 | "Add MML tags to S/MIME sign this MML part." | |
206 | (interactive) | |
207 | (mml-secure-part "smime" 'sign)) | |
208 | ||
209 | (defun mml-secure-encrypt-pgp () | |
210 | "Add MML tags to PGP encrypt this MML part." | |
211 | (interactive) | |
212 | (mml-secure-part "pgp")) | |
213 | ||
214 | (defun mml-secure-encrypt-pgpmime () | |
215 | "Add MML tags to PGP/MIME encrypt this MML part." | |
216 | (interactive) | |
217 | (mml-secure-part "pgpmime")) | |
218 | ||
219 | (defun mml-secure-encrypt-smime () | |
220 | "Add MML tags to S/MIME encrypt this MML part." | |
221 | (interactive) | |
222 | (mml-secure-part "smime")) | |
223 | ||
224 | ;; defuns that add the proper <#secure ...> tag to the top of the message body | |
225 | (defun mml-secure-message (method &optional modesym) | |
226 | (let ((mode (prin1-to-string modesym)) | |
227 | insert-loc) | |
228 | (mml-unsecure-message) | |
229 | (save-excursion | |
230 | (goto-char (point-min)) | |
231 | (cond ((re-search-forward | |
232 | (concat "^" (regexp-quote mail-header-separator) "\n") nil t) | |
233 | (goto-char (setq insert-loc (match-end 0))) | |
234 | (unless (looking-at "<#secure") | |
235 | (mml-insert-tag | |
236 | 'secure 'method method 'mode mode))) | |
237 | (t (error | |
238 | "The message is corrupted. No mail header separator")))) | |
239 | (when (eql insert-loc (point)) | |
240 | (forward-line 1)))) | |
241 | ||
242 | (defun mml-unsecure-message () | |
243 | "Remove security related MML tags from message." | |
244 | (interactive) | |
245 | (save-excursion | |
246 | (goto-char (point-max)) | |
247 | (when (re-search-backward "^<#secure.*>\n" nil t) | |
248 | (delete-region (match-beginning 0) (match-end 0))))) | |
249 | ||
250 | (defun mml-secure-message-sign-smime () | |
251 | "Add MML tag to encrypt/sign the entire message." | |
252 | (interactive) | |
253 | (mml-secure-message "smime" 'sign)) | |
254 | ||
255 | (defun mml-secure-message-sign-pgp () | |
256 | "Add MML tag to encrypt/sign the entire message." | |
257 | (interactive) | |
258 | (mml-secure-message "pgp" 'sign)) | |
259 | ||
260 | (defun mml-secure-message-sign-pgpmime () | |
261 | "Add MML tag to encrypt/sign the entire message." | |
262 | (interactive) | |
263 | (mml-secure-message "pgpmime" 'sign)) | |
264 | ||
265 | (defun mml-secure-message-sign-pgpauto () | |
266 | "Add MML tag to encrypt/sign the entire message." | |
267 | (interactive) | |
268 | (mml-secure-message "pgpauto" 'sign)) | |
269 | ||
270 | (defun mml-secure-message-encrypt-smime (&optional dontsign) | |
271 | "Add MML tag to encrypt and sign the entire message. | |
272 | If called with a prefix argument, only encrypt (do NOT sign)." | |
273 | (interactive "P") | |
274 | (mml-secure-message "smime" (if dontsign 'encrypt 'signencrypt))) | |
275 | ||
276 | (defun mml-secure-message-encrypt-pgp (&optional dontsign) | |
277 | "Add MML tag to encrypt and sign the entire message. | |
278 | If called with a prefix argument, only encrypt (do NOT sign)." | |
279 | (interactive "P") | |
280 | (mml-secure-message "pgp" (if dontsign 'encrypt 'signencrypt))) | |
281 | ||
282 | (defun mml-secure-message-encrypt-pgpmime (&optional dontsign) | |
283 | "Add MML tag to encrypt and sign the entire message. | |
284 | If called with a prefix argument, only encrypt (do NOT sign)." | |
285 | (interactive "P") | |
286 | (mml-secure-message "pgpmime" (if dontsign 'encrypt 'signencrypt))) | |
287 | ||
288 | (defun mml-secure-message-encrypt-pgpauto (&optional dontsign) | |
289 | "Add MML tag to encrypt and sign the entire message. | |
290 | If called with a prefix argument, only encrypt (do NOT sign)." | |
291 | (interactive "P") | |
292 | (mml-secure-message "pgpauto" (if dontsign 'encrypt 'signencrypt))) | |
293 | ||
294 | (provide 'mml-sec) | |
295 | ||
296 | ;;; arch-tag: 111c56e7-df5e-4287-87d7-93ed2911ec6c | |
297 | ;;; mml-sec.el ends here |