pgg-pgp5.el

   1 ;;; pgg-pgp5.el --- PGP 5.* support for PGG.
   2
   3 ;; Copyright (C) 1999,2000 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-pgp5 ()
  31   "PGP 5.* interface"
  32   :group 'pgg)
  33
  34 (defcustom pgg-pgp5-pgpe-program "pgpe"
  35   "PGP 5.* 'pgpe' executable."
  36   :group 'pgg-pgp5
  37   :type 'string)
  38
  39 (defcustom pgg-pgp5-pgps-program "pgps"
  40   "PGP 5.* 'pgps' executable."
  41   :group 'pgg-pgp5
  42   :type 'string)
  43
  44 (defcustom pgg-pgp5-pgpk-program "pgpk"
  45   "PGP 5.* 'pgpk' executable."
  46   :group 'pgg-pgp5
  47   :type 'string)
  48
  49 (defcustom pgg-pgp5-pgpv-program "pgpv"
  50   "PGP 5.* 'pgpv' executable."
  51   :group 'pgg-pgp5
  52   :type 'string)
  53
  54 (defcustom pgg-pgp5-shell-file-name "/bin/sh"
  55   "File name to load inferior shells from.
  56 Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"."
  57   :group 'pgg-pgp5
  58   :type 'string)
  59
  60 (defcustom pgg-pgp5-shell-command-switch "-c"
  61   "Switch used to have the shell execute its command line argument."
  62   :group 'pgg-pgp5
  63   :type 'string)
  64
  65 (defcustom pgg-pgp5-extra-args nil
  66   "Extra arguments for every PGP 5.* invocation."
  67   :group 'pgg-pgp5
  68   :type 'string)
  69
  70 (eval-and-compile
  71   (luna-define-class pgg-scheme-pgp5 (pgg-scheme)))
  72
  73 (defvar pgg-pgp5-user-id nil
  74   "PGP 5.* ID of your default identity.")
  75
  76 (defvar pgg-scheme-pgp5-instance nil)
  77
  78 ;;;###autoload
  79 (defun pgg-make-scheme-pgp5 ()
  80   (or pgg-scheme-pgp5-instance
  81       (setq pgg-scheme-pgp5-instance
  82             (luna-make-entity 'pgg-scheme-pgp5))))
  83
  84 (defun pgg-pgp5-process-region (start end passphrase program args)
  85   (let* ((errors-file-name
  86           (concat temporary-file-directory
  87                   (make-temp-name "pgg-errors")))
  88          (args
  89           (append args
  90                   pgg-pgp5-extra-args
  91                   (list (concat "2>" errors-file-name))))
  92          (shell-file-name pgg-pgp5-shell-file-name)
  93          (shell-command-switch pgg-pgp5-shell-command-switch)
  94          (process-environment process-environment)
  95          (output-buffer pgg-output-buffer)
  96          (errors-buffer pgg-errors-buffer)
  97          (process-connection-type nil)
  98          process status exit-status)
  99     (with-current-buffer (get-buffer-create output-buffer)
 100       (buffer-disable-undo)
 101       (erase-buffer))
 102     (when passphrase
 103       (setenv "PGPPASSFD" "0"))
 104     (unwind-protect
 105         (progn
 106           (as-binary-process
 107            (setq process
 108                  (apply #'start-process-shell-command "*PGP*" output-buffer
 109                         program args)))
 110           (set-process-sentinel process #'ignore)
 111           (when passphrase
 112             (process-send-string process (concat passphrase "\n")))
 113           (process-send-region process start end)
 114           (process-send-eof process)
 115           (while (eq 'run (process-status process))
 116             (accept-process-output process 5))
 117           (setq status (process-status process)
 118                 exit-status (process-exit-status process))
 119           (delete-process process)
 120           (with-current-buffer output-buffer
 121             (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 122
 123             (if (memq status '(stop signal))
 124                 (error "%s exited abnormally: '%s'" program exit-status))
 125             (if (= 127 exit-status)
 126                 (error "%s could not be found" program))
 127
 128             (set-buffer (get-buffer-create errors-buffer))
 129             (buffer-disable-undo)
 130             (erase-buffer)
 131             (insert-file-contents errors-file-name)))
 132       (if (and process (eq 'run (process-status process)))
 133           (interrupt-process process))
 134       (condition-case nil
 135           (delete-file errors-file-name)
 136         (file-error nil)))))
 137
 138 (luna-define-method pgg-scheme-lookup-key ((scheme pgg-scheme-pgp5)
 139                                                   string &optional type)
 140   (let ((args (list "+language=en" "-l" string)))
 141     (with-current-buffer (get-buffer-create pgg-output-buffer)
 142       (buffer-disable-undo)
 143       (erase-buffer)
 144       (apply #'call-process pgg-pgp5-pgpk-program nil t nil args)
 145       (goto-char (point-min))
 146       (when (re-search-forward "^sec" nil t)
 147         (substring
 148          (nth 2 (split-string
 149                  (buffer-substring (match-end 0)(progn (end-of-line)(point)))))
 150          2)))))
 151
 152 (luna-define-method pgg-scheme-encrypt-region ((scheme pgg-scheme-pgp5)
 153                                                start end recipients)
 154   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 155          (args
 156           `("+NoBatchInvalidKeys=off" "-fat" "+batchmode=1"
 157             ,@(if recipients
 158                   (apply #'append
 159                          (mapcar (lambda (rcpt)
 160                                    (list "-r"
 161                                          (concat "\"" rcpt "\"")))
 162                                  (append recipients
 163                                          (if pgg-encrypt-for-me
 164                                              (list pgg-pgp5-user-id)))))))))
 165     (pgg-pgp5-process-region start end nil pgg-pgp5-pgpe-program args)
 166     (pgg-process-when-success nil)))
 167
 168 (luna-define-method pgg-scheme-decrypt-region ((scheme pgg-scheme-pgp5)
 169                                                start end)
 170   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 171          (passphrase
 172           (pgg-read-passphrase
 173            (format "PGP passphrase for %s: " pgg-pgp5-user-id)
 174            (pgg-scheme-lookup-key scheme pgg-pgp5-user-id 'encrypt)))
 175          (args
 176           '("+verbose=1" "+batchmode=1" "+language=us" "-f")))
 177     (pgg-pgp5-process-region start end passphrase pgg-pgp5-pgpv-program args)
 178     (pgg-process-when-success nil)))
 179
 180 (luna-define-method pgg-scheme-sign-region ((scheme pgg-scheme-pgp5)
 181                                             start end &optional clearsign)
 182   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 183          (passphrase
 184           (pgg-read-passphrase
 185            (format "PGP passphrase for %s: " pgg-pgp5-user-id)
 186            (pgg-scheme-lookup-key scheme pgg-pgp5-user-id 'sign)))
 187          (args
 188           (list (if clearsign "-fat" "-fbat")
 189                 "+verbose=1" "+language=us" "+batchmode=1"
 190                 "-u" pgg-pgp5-user-id)))
 191     (pgg-pgp5-process-region start end passphrase pgg-pgp5-pgps-program args)
 192     (pgg-process-when-success
 193       (when (re-search-forward "^-+BEGIN PGP SIGNATURE" 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-cache
 201                (cdr (assq 'key-identifier packet))
 202                passphrase)))))))
 203
 204 (luna-define-method pgg-scheme-verify-region ((scheme pgg-scheme-pgp5)
 205                                               start end &optional signature)
 206   (let* ((basename (expand-file-name "pgg" temporary-file-directory))
 207          (orig-file (make-temp-name basename))
 208          (args '("+verbose=1" "+batchmode=1" "+language=us"))
 209          (orig-mode (default-file-modes)))
 210     (unwind-protect
 211         (progn
 212           (set-default-file-modes 448)
 213           (write-region-as-binary start end orig-file))
 214       (set-default-file-modes orig-mode))
 215     (when (stringp signature)
 216       (copy-file signature (setq signature (concat orig-file ".asc")))
 217       (setq args (append args (list signature))))
 218     (pgg-pgp5-process-region (point)(point) nil pgg-pgp5-pgpv-program args)
 219     (delete-file orig-file)
 220     (if signature (delete-file signature))
 221     (with-current-buffer pgg-errors-buffer
 222       (goto-char (point-min))
 223       (if (re-search-forward "^Good signature" nil t)
 224           (progn
 225             (set-buffer pgg-output-buffer)
 226             (insert-buffer-substring pgg-errors-buffer)
 227             t)
 228         nil))))
 229
 230 (luna-define-method pgg-scheme-insert-key ((scheme pgg-scheme-pgp5))
 231   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 232          (args
 233           (list "+verbose=1" "+batchmode=1" "+language=us" "-x"
 234                 (concat "\"" pgg-pgp5-user-id "\""))))
 235     (pgg-pgp5-process-region (point)(point) nil pgg-pgp5-pgpk-program args)
 236     (insert-buffer-substring pgg-output-buffer)))
 237
 238 (luna-define-method pgg-scheme-snarf-keys-region ((scheme pgg-scheme-pgp5)
 239                                                   start end)
 240   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 241          (basename (expand-file-name "pgg" temporary-file-directory))
 242          (key-file (make-temp-name basename))
 243          (args
 244           (list "+verbose=1" "+batchmode=1" "+language=us" "-a"
 245                 key-file)))
 246     (write-region-as-raw-text-CRLF start end key-file)
 247     (pgg-pgp5-process-region start end nil pgg-pgp5-pgpk-program args)
 248     (delete-file key-file)
 249     (pgg-process-when-success nil)))
 250
 251 (provide 'pgg-pgp5)
 252
 253 ;;; pgg-pgp5.el ends here