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   "The GnuPG executable."
  41   :group 'pgg-pgp
  42   :type 'string)
  43
  44 (defcustom pgg-pgp-extra-args nil
  45   "Extra arguments for every PGP invocation."
  46   :group 'pgg-pgp
  47   :type 'string)
  48
  49 (eval-and-compile
  50   (luna-define-class pgg-scheme-pgp (pgg-scheme))
  51   )
  52
  53 (defvar pgg-pgp-user-id nil
  54   "GnuPG ID of your default identity.")
  55
  56 (defvar pgg-scheme-pgp-instance nil)
  57
  58 ;;;###autoload
  59 (defun pgg-make-scheme-pgp ()
  60   (or pgg-scheme-pgp-instance
  61       (setq pgg-scheme-pgp-instance
  62             (luna-make-entity 'pgg-scheme-pgp))))
  63
  64 (defun pgg-pgp-process-region (start end passphrase program args)
  65   (let* ((errors-file-name
  66           (concat temporary-file-directory
  67                   (make-temp-name "pgg-errors")))
  68          (args
  69           (append args
  70                   pgg-pgp-extra-args
  71                   (list (concat "2>" errors-file-name))))
  72          (shell-file-name pgg-pgp-shell-file-name)
  73          (output-buffer pgg-output-buffer)
  74          (errors-buffer pgg-errors-buffer)
  75          (process-connection-type nil)
  76          process status exit-status)
  77     (with-current-buffer (get-buffer-create output-buffer)
  78       (buffer-disable-undo)
  79       (erase-buffer))
  80     (when passphrase
  81       (setenv "PGPPASSFD" "0"))
  82     (setq process
  83           (apply #'start-process-shell-command "*PGP*" output-buffer
  84                  program args))
  85     (set-process-sentinel process 'ignore)
  86     (when passphrase
  87       (process-send-string process (concat passphrase "\n")))
  88     (process-send-region process start end)
  89     (process-send-eof process)
  90     (while (eq 'run (process-status process))
  91       (accept-process-output process 5))
  92     (setq status (process-status process)
  93           exit-status (process-exit-status process))
  94     (delete-process process)
  95     (with-current-buffer output-buffer
  96       (goto-char (point-min))
  97       (while (search-forward "\r$" nil t)
  98         (replace-match ""))
  99       (if (memq status '(stop signal))
 100           (error "%s exited abnormally: '%s'" program exit-status))
 101       (if (= 127 exit-status)
 102           (error "%s could not be found" program))
 103
 104       (set-buffer (get-buffer-create errors-buffer))
 105       (buffer-disable-undo)
 106       (erase-buffer)
 107       (insert-file-contents errors-file-name)
 108       (delete-file errors-file-name)
 109
 110       (if (and process (eq 'run (process-status process)))
 111           (interrupt-process process))
 112       )
 113     ))
 114
 115 (luna-define-method lookup-key-string ((scheme pgg-scheme-pgp)
 116                                        string &optional type)
 117   (let ((args (list "+batchmode" "+language=en" "-kv" string)))
 118     (with-current-buffer (get-buffer-create pgg-output-buffer)
 119       (buffer-disable-undo)
 120       (erase-buffer)
 121       (apply #'call-process pgg-pgp-program nil t args)
 122       (goto-char (point-min))
 123       (cond
 124        ((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
 125         (buffer-substring (point)(+ 8 (point))))
 126        ((re-search-forward "^Type" nil t);PGP 6.*
 127         (beginning-of-line 2)
 128         (substring
 129          (nth 2 (split-string
 130                  (buffer-substring (point)
 131                                    (progn (end-of-line) (point)))
 132                  ))
 133          2))))
 134     ))
 135
 136 (luna-define-method encrypt-region ((scheme pgg-scheme-pgp)
 137                                     start end recipients)
 138   (let* ((pgg-pgp-user-id pgg-default-user-id)
 139          (passphrase
 140           (pgg-read-passphrase
 141            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 142            (luna-send scheme 'lookup-key-string
 143                       scheme pgg-pgp-user-id 'encrypt)))
 144          (args
 145           `("+encrypttoself=off +verbose=1" "+batchmode"
 146             "+language=us" "-fate"
 147             ,@(if recipients
 148                   (mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
 149                           recipients)))))
 150     (pgg-pgp-process-region start end passphrase
 151                             pgg-pgp-program args)
 152     (pgg-process-when-success
 153       (let ((packet
 154              (cdr (assq 1 (pgg-parse-armor-region
 155                            (point-min)(point-max))))))
 156         (pgg-add-passphrase-cache
 157          (cdr (assq 'key-identifier packet))
 158          passphrase)))
 159     ))
 160
 161 (luna-define-method decrypt-region ((scheme pgg-scheme-pgp)
 162                                     start end)
 163   (let* ((pgg-pgp-user-id pgg-default-user-id)
 164          (passphrase
 165           (pgg-read-passphrase
 166            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 167            (luna-send scheme 'lookup-key-string
 168                       scheme pgg-pgp-user-id 'encrypt)))
 169          (args
 170           '("+verbose=1" "+batchmode" "+language=us" "-f")))
 171     (pgg-pgp-process-region start end passphrase
 172                             pgg-pgp-program args)
 173     (pgg-process-when-success nil)
 174     ))
 175
 176 (luna-define-method sign-region ((scheme pgg-scheme-pgp)
 177                                  start end &optional clearsign)
 178   (let* ((pgg-pgp-user-id pgg-default-user-id)
 179          (passphrase
 180           (pgg-read-passphrase
 181            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 182            (luna-send scheme 'lookup-key-string
 183                       scheme pgg-pgp-user-id 'sign)))
 184          (args
 185           (list (if clearsign "-fast" "-fbast")
 186                 "+verbose=1" "+language=us" "+batchmode"
 187                 "-u" pgg-pgp-user-id)))
 188     (pgg-pgp-process-region start end passphrase
 189                              pgg-pgp-program args)
 190     (pgg-process-when-success
 191       (goto-char (point-min))
 192       (while (re-search-forward "\r$" end t)
 193         (replace-match ""))
 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           (pgg-add-passphrase-cache
 201            (cdr (assq 'key-identifier packet))
 202            passphrase))))
 203     ))
 204
 205 (luna-define-method verify-region ((scheme pgg-scheme-pgp)
 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" "+language=us")))
 210     (write-region-as-binary start end orig-file)
 211     (when (stringp signature)
 212       (copy-file signature (setq signature (concat orig-file ".asc")))
 213       (setq args (append args (list signature orig-file)))
 214       )
 215     (pgg-pgp-process-region (point-min)(point-max) nil
 216                             pgg-pgp-program args)
 217     (delete-file orig-file)
 218     (if signature (delete-file signature))
 219     (pgg-process-when-success nil)
 220     ))
 221
 222 (luna-define-method insert-key ((scheme pgg-scheme-pgp))
 223   (let* ((pgg-pgp-user-id pgg-default-user-id)
 224          (args
 225           (list "+verbose=1" "+batchmode" "+language=us" "-kxaf"
 226                 (concat "\"" pgg-pgp-user-id "\""))))
 227     (pgg-pgp-process-region (point)(point) nil
 228                              pgg-pgp-program args)
 229     (insert-buffer-substring pgg-output-buffer)
 230     ))
 231
 232 (luna-define-method snarf-keys-region ((scheme pgg-scheme-pgp)
 233                                        start end)
 234   (let* ((pgg-pgp-user-id pgg-default-user-id)
 235          (basename (expand-file-name "pgg" temporary-file-directory))
 236          (key-file (make-temp-name basename))
 237          (args
 238           (list "+verbose=1" "+batchmode" "+language=us" "-kaf"
 239                 key-file)))
 240     (write-region-as-raw-text-CRLF start end key-file)
 241     (pgg-pgp-process-region start end nil
 242                             pgg-pgp-program args)
 243     (delete-file key-file)
 244     ))
 245
 246 (provide 'pgg-pgp)
 247
 248 ;;; pgg-pgp.el ends here