pgg-pgp.el

   1 ;;; pgg-pgp.el --- PGP 2.* and 6.* support for PGG.
   2
   3 ;; Copyright (C) 1999 Daiki Ueno
   4
   5 ;; Author: Daiki Ueno <ueno@ueda.info.waseda.ac.jp>
   6 ;; Created: 1999/11/02
   7 ;; Keywords: PGP, OpenPGP
   8
   9 ;; This file is part of SEMI (Secure Emacs MIME Interface).
  10
  11 ;; This program is free software; you can redistribute it and/or
  12 ;; modify it under the terms of the GNU General Public License as
  13 ;; published by the Free Software Foundation; either version 2, or (at
  14 ;; your option) any later version.
  15
  16 ;; This program is distributed in the hope that it will be useful, but
  17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19 ;; General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Code:
  27
  28 (eval-when-compile (require 'pgg))
  29
  30 (defgroup pgg-pgp ()
  31   "PGP 2.* and 6.* interface"
  32   :group 'pgg)
  33
  34 (defcustom pgg-pgp-program "pgp"
  35   "PGP 2.* and 6.* executable."
  36   :group 'pgg-pgp
  37   :type 'string)
  38
  39 (defcustom pgg-pgp-shell-file-name "/bin/sh"
  40   "File name to load inferior shells from.  Bourne shell or its equivalent
  41 \(not tcsh) is needed for \"2>\"."
  42   :group 'pgg-pgp
  43   :type 'string)
  44
  45 (defcustom pgg-pgp-shell-command-switch "-c"
  46   "Switch used to have the shell execute its command line argument."
  47   :group 'pgg-pgp
  48   :type 'string)
  49
  50 (defcustom pgg-pgp-extra-args nil
  51   "Extra arguments for every PGP invocation."
  52   :group 'pgg-pgp
  53   :type 'string)
  54
  55 (eval-and-compile
  56   (luna-define-class pgg-scheme-pgp (pgg-scheme))
  57   )
  58
  59 (defvar pgg-pgp-user-id nil
  60   "GnuPG ID of your default identity.")
  61
  62 (defvar pgg-scheme-pgp-instance nil)
  63
  64 ;;;###autoload
  65 (defun pgg-make-scheme-pgp ()
  66   (or pgg-scheme-pgp-instance
  67       (setq pgg-scheme-pgp-instance
  68             (luna-make-entity 'pgg-scheme-pgp))))
  69
  70 (defun pgg-pgp-process-region (start end passphrase program args)
  71   (let* ((errors-file-name
  72           (concat temporary-file-directory
  73                   (make-temp-name "pgg-errors")))
  74          (args
  75           (append args
  76                   pgg-pgp-extra-args
  77                   (list (concat "2>" errors-file-name))))
  78          (shell-file-name pgg-pgp-shell-file-name)
  79          (shell-command-switch pgg-pgp-shell-command-switch)
  80          (output-buffer pgg-output-buffer)
  81          (errors-buffer pgg-errors-buffer)
  82          (process-connection-type nil)
  83          process status exit-status)
  84     (with-current-buffer (get-buffer-create output-buffer)
  85       (buffer-disable-undo)
  86       (erase-buffer))
  87     (when passphrase
  88       (setenv "PGPPASSFD" "0"))
  89     (setq process
  90           (apply #'start-process-shell-command "*PGP*" output-buffer
  91                  program args))
  92     (set-process-sentinel process 'ignore)
  93     (when passphrase
  94       (process-send-string process (concat passphrase "\n")))
  95     (process-send-region process start end)
  96     (process-send-eof process)
  97     (while (eq 'run (process-status process))
  98       (accept-process-output process 5))
  99     (setq status (process-status process)
 100           exit-status (process-exit-status process))
 101     (delete-process process)
 102     (with-current-buffer output-buffer
 103       (goto-char (point-min))
 104       (while (search-forward "\r$" nil t)
 105         (replace-match ""))
 106       (if (memq status '(stop signal))
 107           (error "%s exited abnormally: '%s'" program exit-status))
 108       (if (= 127 exit-status)
 109           (error "%s could not be found" program))
 110
 111       (set-buffer (get-buffer-create errors-buffer))
 112       (buffer-disable-undo)
 113       (erase-buffer)
 114       (insert-file-contents errors-file-name)
 115       (delete-file errors-file-name)
 116
 117       (if (and process (eq 'run (process-status process)))
 118           (interrupt-process process))
 119       )
 120     ))
 121
 122 (luna-define-method lookup-key-string ((scheme pgg-scheme-pgp)
 123                                        string &optional type)
 124   (let ((args (list "+batchmode" "+language=en" "-kv" string)))
 125     (with-current-buffer (get-buffer-create pgg-output-buffer)
 126       (buffer-disable-undo)
 127       (erase-buffer)
 128       (apply #'call-process pgg-pgp-program nil t args)
 129       (goto-char (point-min))
 130       (cond
 131        ((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
 132         (buffer-substring (point)(+ 8 (point))))
 133        ((re-search-forward "^Type" nil t);PGP 6.*
 134         (beginning-of-line 2)
 135         (substring
 136          (nth 2 (split-string
 137                  (buffer-substring (point)
 138                                    (progn (end-of-line) (point)))
 139                  ))
 140          2))))
 141     ))
 142
 143 (luna-define-method encrypt-region ((scheme pgg-scheme-pgp)
 144                                     start end recipients)
 145   (let* ((pgg-pgp-user-id pgg-default-user-id)
 146          (passphrase
 147           (pgg-read-passphrase
 148            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 149            (luna-send scheme 'lookup-key-string
 150                       scheme pgg-pgp-user-id 'encrypt)))
 151          (args
 152           `("+encrypttoself=off +verbose=1" "+batchmode"
 153             "+language=us" "-fate"
 154             ,@(if recipients
 155                   (mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
 156                           recipients)))))
 157     (pgg-pgp-process-region start end passphrase
 158                             pgg-pgp-program args)
 159     (pgg-process-when-success
 160       (let ((packet
 161              (cdr (assq 1 (pgg-parse-armor-region
 162                            (point-min)(point-max))))))
 163         (pgg-add-passphrase-cache
 164          (cdr (assq 'key-identifier packet))
 165          passphrase)))
 166     ))
 167
 168 (luna-define-method decrypt-region ((scheme pgg-scheme-pgp)
 169                                     start end)
 170   (let* ((pgg-pgp-user-id pgg-default-user-id)
 171          (passphrase
 172           (pgg-read-passphrase
 173            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 174            (luna-send scheme 'lookup-key-string
 175                       scheme pgg-pgp-user-id 'encrypt)))
 176          (args
 177           '("+verbose=1" "+batchmode" "+language=us" "-f")))
 178     (pgg-pgp-process-region start end passphrase
 179                             pgg-pgp-program args)
 180     (pgg-process-when-success nil)
 181     ))
 182
 183 (luna-define-method sign-region ((scheme pgg-scheme-pgp)
 184                                  start end &optional clearsign)
 185   (let* ((pgg-pgp-user-id pgg-default-user-id)
 186          (passphrase
 187           (pgg-read-passphrase
 188            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 189            (luna-send scheme 'lookup-key-string
 190                       scheme pgg-pgp-user-id 'sign)))
 191          (args
 192           (list (if clearsign "-fast" "-fbast")
 193                 "+verbose=1" "+language=us" "+batchmode"
 194                 "-u" pgg-pgp-user-id)))
 195     (pgg-pgp-process-region start end passphrase
 196                              pgg-pgp-program args)
 197     (pgg-process-when-success
 198       (goto-char (point-min))
 199       (when (re-search-forward "^-+BEGIN PGP" nil t);XXX
 200         (let ((packet
 201                (cdr (assq 2 (pgg-parse-armor-region
 202                              (progn (beginning-of-line 2)
 203                                     (point))
 204                              (point-max))))))
 205           (pgg-add-passphrase-cache
 206            (cdr (assq 'key-identifier packet))
 207            passphrase))))
 208     ))
 209
 210 (luna-define-method verify-region ((scheme pgg-scheme-pgp)
 211                                    start end &optional signature)
 212   (let* ((basename (expand-file-name "pgg" temporary-file-directory))
 213          (orig-file (make-temp-name basename))
 214          (args '("+verbose=1" "+batchmode" "+language=us")))
 215     (write-region-as-binary start end orig-file)
 216     (when (stringp signature)
 217       (copy-file signature (setq signature (concat orig-file ".asc")))
 218       (setq args (append args (list signature orig-file)))
 219       )
 220     (pgg-pgp-process-region (point-min)(point-max) nil
 221                             pgg-pgp-program args)
 222     (delete-file orig-file)
 223     (if signature (delete-file signature))
 224     (pgg-process-when-success nil)
 225     ))
 226
 227 (luna-define-method insert-key ((scheme pgg-scheme-pgp))
 228   (let* ((pgg-pgp-user-id pgg-default-user-id)
 229          (args
 230           (list "+verbose=1" "+batchmode" "+language=us" "-kxaf"
 231                 (concat "\"" pgg-pgp-user-id "\""))))
 232     (pgg-pgp-process-region (point)(point) nil
 233                              pgg-pgp-program args)
 234     (insert-buffer-substring pgg-output-buffer)
 235     ))
 236
 237 (luna-define-method snarf-keys-region ((scheme pgg-scheme-pgp)
 238                                        start end)
 239   (let* ((pgg-pgp-user-id pgg-default-user-id)
 240          (basename (expand-file-name "pgg" temporary-file-directory))
 241          (key-file (make-temp-name basename))
 242          (args
 243           (list "+verbose=1" "+batchmode" "+language=us" "-kaf"
 244                 key-file)))
 245     (write-region-as-raw-text-CRLF start end key-file)
 246     (pgg-pgp-process-region start end nil
 247                             pgg-pgp-program args)
 248     (delete-file key-file)
 249     (pgg-process-when-success nil)
 250     ))
 251
 252 (provide 'pgg-pgp)
 253
 254 ;;; pgg-pgp.el ends here