lisp/pgg-pgp.el

   1 ;;; pgg-pgp.el --- PGP 2.* and 6.* support for PGG.
   2
   3 ;; Copyright (C) 1999, 2000, 2002, 2003, 2004,
   4 ;;   2005, 2006 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