mime/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 (require 'mel) ; binary-to-text-funcall, binary-write-decoded-region
  29 (eval-when-compile (require 'pgg))
  30
  31 (defgroup pgg-pgp5 ()
  32   "PGP 5.* interface"
  33   :group 'pgg)
  34
  35 (defcustom pgg-pgp5-pgpe-program "pgpe"
  36   "PGP 5.* 'pgpe' executable."
  37   :group 'pgg-pgp5
  38   :type 'string)
  39
  40 (defcustom pgg-pgp5-pgps-program "pgps"
  41   "PGP 5.* 'pgps' executable."
  42   :group 'pgg-pgp5
  43   :type 'string)
  44
  45 (defcustom pgg-pgp5-pgpk-program "pgpk"
  46   "PGP 5.* 'pgpk' executable."
  47   :group 'pgg-pgp5
  48   :type 'string)
  49
  50 (defcustom pgg-pgp5-pgpv-program "pgpv"
  51   "PGP 5.* 'pgpv' executable."
  52   :group 'pgg-pgp5
  53   :type 'string)
  54
  55 (defcustom pgg-pgp5-shell-file-name "/bin/sh"
  56   "File name to load inferior shells from.
  57 Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"."
  58   :group 'pgg-pgp5
  59   :type 'string)
  60
  61 (defcustom pgg-pgp5-shell-command-switch "-c"
  62   "Switch used to have the shell execute its command line argument."
  63   :group 'pgg-pgp5
  64   :type 'string)
  65
  66 (defcustom pgg-pgp5-extra-args nil
  67   "Extra arguments for every PGP 5.* invocation."
  68   :group 'pgg-pgp5
  69   :type 'string)
  70
  71 (eval-and-compile
  72   (luna-define-class pgg-scheme-pgp5 (pgg-scheme)))
  73
  74 (defvar pgg-pgp5-user-id nil
  75   "PGP 5.* ID of your default identity.")
  76
  77 (defvar pgg-scheme-pgp5-instance nil)
  78
  79 ;;;###autoload
  80 (defun pgg-make-scheme-pgp5 ()
  81   (or pgg-scheme-pgp5-instance
  82       (setq pgg-scheme-pgp5-instance
  83             (luna-make-entity 'pgg-scheme-pgp5))))
  84
  85 (defun pgg-pgp5-process-region (start end passphrase program args)
  86   (let* ((errors-file-name
  87           (concat temporary-file-directory
  88                   (make-temp-name "pgg-errors")))
  89          (args
  90           (append args
  91                   pgg-pgp5-extra-args
  92                   (list (concat "2>" errors-file-name))))
  93          (shell-file-name pgg-pgp5-shell-file-name)
  94          (shell-command-switch pgg-pgp5-shell-command-switch)
  95          (process-environment process-environment)
  96          (output-buffer pgg-output-buffer)
  97          (errors-buffer pgg-errors-buffer)
  98          (process-connection-type nil)
  99          process status exit-status)
 100     (with-current-buffer (get-buffer-create output-buffer)
 101       (buffer-disable-undo)
 102       (erase-buffer))
 103     (when passphrase
 104       (setenv "PGPPASSFD" "0"))
 105     (unwind-protect
 106         (progn
 107           (setq process
 108                 (apply #'binary-funcall
 109                        #'start-process-shell-command "*PGP*" output-buffer
 110                        program args))
 111           (set-process-sentinel process #'ignore)
 112           (when passphrase
 113             (process-send-string process (concat passphrase "\n")))
 114           (process-send-region process start end)
 115           (process-send-eof process)
 116           (while (eq 'run (process-status process))
 117             (accept-process-output process 5))
 118           (setq status (process-status process)
 119                 exit-status (process-exit-status process))
 120           (delete-process process)
 121           (with-current-buffer output-buffer
 122             (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 123
 124             (if (memq status '(stop signal))
 125                 (error "%s exited abnormally: '%s'" program exit-status))
 126             (if (= 127 exit-status)
 127                 (error "%s could not be found" program))
 128
 129             (set-buffer (get-buffer-create errors-buffer))
 130             (buffer-disable-undo)
 131             (erase-buffer)
 132             (insert-file-contents errors-file-name)))
 133       (if (and process (eq 'run (process-status process)))
 134           (interrupt-process process))
 135       (condition-case nil
 136           (delete-file errors-file-name)
 137         (file-error nil)))))
 138
 139 (luna-define-method pgg-scheme-lookup-key ((scheme pgg-scheme-pgp5)
 140                                                   string &optional type)
 141   (let ((args (list "+language=en" "-l" string)))
 142     (with-current-buffer (get-buffer-create pgg-output-buffer)
 143       (buffer-disable-undo)
 144       (erase-buffer)
 145       (apply #'call-process pgg-pgp5-pgpk-program nil t nil args)
 146       (goto-char (point-min))
 147       (when (re-search-forward "^sec" nil t)
 148         (substring
 149          (nth 2 (split-string
 150                  (buffer-substring (match-end 0)(progn (end-of-line)(point)))))
 151          2)))))
 152
 153 (luna-define-method pgg-scheme-encrypt-region ((scheme pgg-scheme-pgp5)
 154                                                start end recipients)
 155   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 156          (args
 157           `("+NoBatchInvalidKeys=off" "-fat" "+batchmode=1"
 158             ,@(if recipients
 159                   (apply #'append
 160                          (mapcar (lambda (rcpt)
 161                                    (list "-r"
 162                                          (concat "\"" rcpt "\"")))
 163                                  (append recipients
 164                                          (if pgg-encrypt-for-me
 165                                              (list pgg-pgp5-user-id)))))))))
 166     (pgg-pgp5-process-region start end nil pgg-pgp5-pgpe-program args)
 167     (pgg-process-when-success nil)))
 168
 169 (luna-define-method pgg-scheme-decrypt-region ((scheme pgg-scheme-pgp5)
 170                                                start end)
 171   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 172          (passphrase
 173           (pgg-read-passphrase
 174            (format "PGP passphrase for %s: " pgg-pgp5-user-id)
 175            (pgg-scheme-lookup-key scheme pgg-pgp5-user-id 'encrypt)))
 176          (args
 177           '("+verbose=1" "+batchmode=1" "+language=us" "-f")))
 178     (pgg-pgp5-process-region start end passphrase pgg-pgp5-pgpv-program args)
 179     (pgg-process-when-success nil)))
 180
 181 (luna-define-method pgg-scheme-sign-region ((scheme pgg-scheme-pgp5)
 182                                             start end &optional clearsign)
 183   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 184          (passphrase
 185           (pgg-read-passphrase
 186            (format "PGP passphrase for %s: " pgg-pgp5-user-id)
 187            (pgg-scheme-lookup-key scheme pgg-pgp5-user-id 'sign)))
 188          (args
 189           (list (if clearsign "-fat" "-fbat")
 190                 "+verbose=1" "+language=us" "+batchmode=1"
 191                 "-u" pgg-pgp5-user-id)))
 192     (pgg-pgp5-process-region start end passphrase pgg-pgp5-pgps-program args)
 193     (pgg-process-when-success
 194       (when (re-search-forward "^-+BEGIN PGP SIGNATURE" nil t);XXX
 195         (let ((packet
 196                (cdr (assq 2 (pgg-parse-armor-region
 197                              (progn (beginning-of-line 2)
 198                                     (point))
 199                              (point-max))))))
 200           (if pgg-cache-passphrase
 201               (pgg-add-passphrase-cache
 202                (cdr (assq 'key-identifier packet))
 203                passphrase)))))))
 204
 205 (luna-define-method pgg-scheme-verify-region ((scheme pgg-scheme-pgp5)
 206                                               start end &optional signature)
 207   (let* ((basename (expand-file-name "pgg" temporary-file-directory))
 208          (orig-file (make-temp-name basename))
 209          (args '("+verbose=1" "+batchmode=1" "+language=us"))
 210          (orig-mode (default-file-modes)))
 211     (unwind-protect
 212         (progn
 213           (set-default-file-modes 448)
 214           (binary-write-decoded-region start end orig-file))
 215       (set-default-file-modes orig-mode))
 216     (when (stringp signature)
 217       (copy-file signature (setq signature (concat orig-file ".asc")))
 218       (setq args (append args (list signature))))
 219     (pgg-pgp5-process-region (point)(point) nil pgg-pgp5-pgpv-program args)
 220     (delete-file orig-file)
 221     (if signature (delete-file signature))
 222     (with-current-buffer pgg-errors-buffer
 223       (goto-char (point-min))
 224       (if (re-search-forward "^Good signature" nil t)
 225           (progn
 226             (set-buffer pgg-output-buffer)
 227             (insert-buffer-substring pgg-errors-buffer)
 228             t)
 229         nil))))
 230
 231 (luna-define-method pgg-scheme-insert-key ((scheme pgg-scheme-pgp5))
 232   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 233          (args
 234           (list "+verbose=1" "+batchmode=1" "+language=us" "-x"
 235                 (concat "\"" pgg-pgp5-user-id "\""))))
 236     (pgg-pgp5-process-region (point)(point) nil pgg-pgp5-pgpk-program args)
 237     (insert-buffer-substring pgg-output-buffer)))
 238
 239 (luna-define-method pgg-scheme-snarf-keys-region ((scheme pgg-scheme-pgp5)
 240                                                   start end)
 241   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 242          (basename (expand-file-name "pgg" temporary-file-directory))
 243          (key-file (make-temp-name basename))
 244          (args
 245           (list "+verbose=1" "+batchmode=1" "+language=us" "-a"
 246                 key-file)))
 247     (let ((coding-system-for-write 'raw-text-dos))
 248       (write-region start end key-file))
 249     (pgg-pgp5-process-region start end nil pgg-pgp5-pgpk-program args)
 250     (delete-file key-file)
 251     (pgg-process-when-success nil)))
 252
 253 (provide 'pgg-pgp5)
 254
 255 ;;; pgg-pgp5.el ends here