| 1 | ;;; pgg-pgp.el --- PGP 2.* and 6.* support for PGG. |
| 2 | |
| 3 | ;; Copyright (C) 1999, 2000, 2002, 2003, 2004, |
| 4 | ;; 2005 Free Software Foundation, Inc. |
| 5 | |
| 6 | ;; Author: Daiki Ueno <ueno@unixuser.org> |
| 7 | ;; Created: 1999/11/02 |
| 8 | ;; Keywords: PGP, OpenPGP |
| 9 | |
| 10 | ;; This file is part of GNU Emacs. |
| 11 | |
| 12 | ;; GNU Emacs is free software; you can redistribute it and/or modify |
| 13 | ;; it under the terms of the GNU General Public License as published by |
| 14 | ;; the Free Software Foundation; either version 2, or (at your option) |
| 15 | ;; any later version. |
| 16 | |
| 17 | ;; GNU Emacs is distributed in the hope that it will be useful, |
| 18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | ;; GNU 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., 51 Franklin Street, Fifth Floor, |
| 25 | ;; Boston, MA 02110-1301, USA. |
| 26 | |
| 27 | ;;; Code: |
| 28 | |
| 29 | (eval-when-compile |
| 30 | (require 'cl) ; for pgg macros |
| 31 | (require 'pgg)) |
| 32 | |
| 33 | (defgroup pgg-pgp () |
| 34 | "PGP 2.* and 6.* interface." |
| 35 | :group 'pgg) |
| 36 | |
| 37 | (defcustom pgg-pgp-program "pgp" |
| 38 | "PGP 2.* and 6.* executable." |
| 39 | :group 'pgg-pgp |
| 40 | :type 'string) |
| 41 | |
| 42 | (defcustom pgg-pgp-shell-file-name "/bin/sh" |
| 43 | "File name to load inferior shells from. |
| 44 | Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"." |
| 45 | :group 'pgg-pgp |
| 46 | :type 'string) |
| 47 | |
| 48 | (defcustom pgg-pgp-shell-command-switch "-c" |
| 49 | "Switch used to have the shell execute its command line argument." |
| 50 | :group 'pgg-pgp |
| 51 | :type 'string) |
| 52 | |
| 53 | (defcustom pgg-pgp-extra-args nil |
| 54 | "Extra arguments for every PGP invocation." |
| 55 | :group 'pgg-pgp |
| 56 | :type '(choice |
| 57 | (const :tag "None" nil) |
| 58 | (string :tag "Arguments"))) |
| 59 | |
| 60 | (defvar pgg-pgp-user-id nil |
| 61 | "PGP ID of your default identity.") |
| 62 | |
| 63 | (defun pgg-pgp-process-region (start end passphrase program args) |
| 64 | (let* ((errors-file-name (pgg-make-temp-file "pgg-errors")) |
| 65 | (args |
| 66 | (append args |
| 67 | pgg-pgp-extra-args |
| 68 | (list (concat "2>" errors-file-name)))) |
| 69 | (shell-file-name pgg-pgp-shell-file-name) |
| 70 | (shell-command-switch pgg-pgp-shell-command-switch) |
| 71 | (process-environment process-environment) |
| 72 | (output-buffer pgg-output-buffer) |
| 73 | (errors-buffer pgg-errors-buffer) |
| 74 | (process-connection-type nil) |
| 75 | process status exit-status) |
| 76 | (with-current-buffer (get-buffer-create output-buffer) |
| 77 | (buffer-disable-undo) |
| 78 | (erase-buffer)) |
| 79 | (when passphrase |
| 80 | (setenv "PGPPASSFD" "0")) |
| 81 | (unwind-protect |
| 82 | (progn |
| 83 | (let ((coding-system-for-read 'binary) |
| 84 | (coding-system-for-write 'binary)) |
| 85 | (setq process |
| 86 | (apply #'funcall |
| 87 | #'start-process-shell-command "*PGP*" output-buffer |
| 88 | program args))) |
| 89 | (set-process-sentinel process #'ignore) |
| 90 | (when passphrase |
| 91 | (process-send-string process (concat passphrase "\n"))) |
| 92 | (process-send-region process start end) |
| 93 | (process-send-eof process) |
| 94 | (while (eq 'run (process-status process)) |
| 95 | (accept-process-output process 5)) |
| 96 | (setq status (process-status process) |
| 97 | exit-status (process-exit-status process)) |
| 98 | (delete-process process) |
| 99 | (with-current-buffer output-buffer |
| 100 | (pgg-convert-lbt-region (point-min)(point-max) 'LF) |
| 101 | |
| 102 | (if (memq status '(stop signal)) |
| 103 | (error "%s exited abnormally: '%s'" program exit-status)) |
| 104 | (if (= 127 exit-status) |
| 105 | (error "%s could not be found" program)) |
| 106 | |
| 107 | (set-buffer (get-buffer-create errors-buffer)) |
| 108 | (buffer-disable-undo) |
| 109 | (erase-buffer) |
| 110 | (insert-file-contents errors-file-name))) |
| 111 | (if (and process (eq 'run (process-status process))) |
| 112 | (interrupt-process process)) |
| 113 | (condition-case nil |
| 114 | (delete-file errors-file-name) |
| 115 | (file-error nil))))) |
| 116 | |
| 117 | (defun pgg-pgp-lookup-key (string &optional type) |
| 118 | "Search keys associated with STRING." |
| 119 | (let ((args (list "+batchmode" "+language=en" "-kv" string))) |
| 120 | (with-current-buffer (get-buffer-create pgg-output-buffer) |
| 121 | (buffer-disable-undo) |
| 122 | (erase-buffer) |
| 123 | (apply #'call-process pgg-pgp-program nil t nil args) |
| 124 | (goto-char (point-min)) |
| 125 | (cond |
| 126 | ((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.* |
| 127 | (buffer-substring (point)(+ 8 (point)))) |
| 128 | ((re-search-forward "^Type" nil t);PGP 6.* |
| 129 | (beginning-of-line 2) |
| 130 | (substring |
| 131 | (nth 2 (split-string |
| 132 | (buffer-substring (point)(progn (end-of-line) (point))))) |
| 133 | 2)))))) |
| 134 | |
| 135 | (defun pgg-pgp-encrypt-region (start end recipients &optional sign passphrase) |
| 136 | "Encrypt the current region between START and END." |
| 137 | (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id)) |
| 138 | (passphrase (or passphrase |
| 139 | (when sign |
| 140 | (pgg-read-passphrase |
| 141 | (format "PGP passphrase for %s: " |
| 142 | pgg-pgp-user-id) |
| 143 | pgg-pgp-user-id)))) |
| 144 | (args |
| 145 | (append |
| 146 | `("+encrypttoself=off +verbose=1" "+batchmode" |
| 147 | "+language=us" "-fate" |
| 148 | ,@(if recipients |
| 149 | (mapcar (lambda (rcpt) (concat "\"" rcpt "\"")) |
| 150 | (append recipients |
| 151 | (if pgg-encrypt-for-me |
| 152 | (list pgg-pgp-user-id)))))) |
| 153 | (if sign '("-s" "-u" pgg-pgp-user-id))))) |
| 154 | (pgg-pgp-process-region start end nil pgg-pgp-program args) |
| 155 | (pgg-process-when-success nil))) |
| 156 | |
| 157 | (defun pgg-pgp-decrypt-region (start end &optional passphrase) |
| 158 | "Decrypt the current region between START and END. |
| 159 | |
| 160 | If optional PASSPHRASE is not specified, it will be obtained from the |
| 161 | passphrase cache or user." |
| 162 | (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id)) |
| 163 | (key (pgg-pgp-lookup-key pgg-pgp-user-id 'encrypt)) |
| 164 | (passphrase |
| 165 | (or passphrase |
| 166 | (pgg-read-passphrase |
| 167 | (format "PGP passphrase for %s: " pgg-pgp-user-id) key))) |
| 168 | (args |
| 169 | '("+verbose=1" "+batchmode" "+language=us" "-f"))) |
| 170 | (pgg-pgp-process-region start end passphrase pgg-pgp-program args) |
| 171 | (pgg-process-when-success |
| 172 | (if pgg-cache-passphrase |
| 173 | (pgg-add-passphrase-to-cache key passphrase))))) |
| 174 | |
| 175 | (defun pgg-pgp-sign-region (start end &optional clearsign passphrase) |
| 176 | "Make detached signature from text between START and END. |
| 177 | |
| 178 | If optional PASSPHRASE is not specified, it will be obtained from the |
| 179 | passphrase cache or user." |
| 180 | (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id)) |
| 181 | (passphrase |
| 182 | (or passphrase |
| 183 | (pgg-read-passphrase |
| 184 | (format "PGP passphrase for %s: " pgg-pgp-user-id) |
| 185 | (pgg-pgp-lookup-key pgg-pgp-user-id 'sign)))) |
| 186 | (args |
| 187 | (list (if clearsign "-fast" "-fbast") |
| 188 | "+verbose=1" "+language=us" "+batchmode" |
| 189 | "-u" pgg-pgp-user-id))) |
| 190 | (pgg-pgp-process-region start end passphrase pgg-pgp-program args) |
| 191 | (pgg-process-when-success |
| 192 | (goto-char (point-min)) |
| 193 | (when (re-search-forward "^-+BEGIN PGP" nil t);XXX |
| 194 | (let ((packet |
| 195 | (cdr (assq 2 (pgg-parse-armor-region |
| 196 | (progn (beginning-of-line 2) |
| 197 | (point)) |
| 198 | (point-max)))))) |
| 199 | (if pgg-cache-passphrase |
| 200 | (pgg-add-passphrase-to-cache |
| 201 | (cdr (assq 'key-identifier packet)) |
| 202 | passphrase))))))) |
| 203 | |
| 204 | (defun pgg-pgp-verify-region (start end &optional signature) |
| 205 | "Verify region between START and END as the detached signature SIGNATURE." |
| 206 | (let* ((orig-file (pgg-make-temp-file "pgg")) |
| 207 | (args '("+verbose=1" "+batchmode" "+language=us")) |
| 208 | (orig-mode (default-file-modes))) |
| 209 | (unwind-protect |
| 210 | (progn |
| 211 | (set-default-file-modes 448) |
| 212 | (let ((coding-system-for-write 'binary) |
| 213 | jka-compr-compression-info-list jam-zcat-filename-list) |
| 214 | (write-region start end orig-file))) |
| 215 | (set-default-file-modes orig-mode)) |
| 216 | (if (stringp signature) |
| 217 | (progn |
| 218 | (copy-file signature (setq signature (concat orig-file ".asc"))) |
| 219 | (setq args (append args (list signature orig-file)))) |
| 220 | (setq args (append args (list orig-file)))) |
| 221 | (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args) |
| 222 | (delete-file orig-file) |
| 223 | (if signature (delete-file signature)) |
| 224 | (pgg-process-when-success |
| 225 | (goto-char (point-min)) |
| 226 | (let ((case-fold-search t)) |
| 227 | (while (re-search-forward "^warning: " nil t) |
| 228 | (delete-region (match-beginning 0) |
| 229 | (progn (beginning-of-line 2) (point))))) |
| 230 | (goto-char (point-min)) |
| 231 | (when (re-search-forward "^\\.$" nil t) |
| 232 | (delete-region (point-min) |
| 233 | (progn (beginning-of-line 2) |
| 234 | (point))))))) |
| 235 | |
| 236 | (defun pgg-pgp-insert-key () |
| 237 | "Insert public key at point." |
| 238 | (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id)) |
| 239 | (args |
| 240 | (list "+verbose=1" "+batchmode" "+language=us" "-kxaf" |
| 241 | (concat "\"" pgg-pgp-user-id "\"")))) |
| 242 | (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args) |
| 243 | (insert-buffer-substring pgg-output-buffer))) |
| 244 | |
| 245 | (defun pgg-pgp-snarf-keys-region (start end) |
| 246 | "Add all public keys in region between START and END to the keyring." |
| 247 | (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id)) |
| 248 | (key-file (pgg-make-temp-file "pgg")) |
| 249 | (args |
| 250 | (list "+verbose=1" "+batchmode" "+language=us" "-kaf" |
| 251 | key-file))) |
| 252 | (let ((coding-system-for-write 'raw-text-dos)) |
| 253 | (write-region start end key-file)) |
| 254 | (pgg-pgp-process-region start end nil pgg-pgp-program args) |
| 255 | (delete-file key-file) |
| 256 | (pgg-process-when-success nil))) |
| 257 | |
| 258 | (provide 'pgg-pgp) |
| 259 | |
| 260 | ;;; arch-tag: 076b7801-37b2-49a6-97c3-218fdecde33c |
| 261 | ;;; pgg-pgp.el ends here |