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     (setq process
  81           (apply #'start-process-shell-command "*PGP*" output-buffer
  82                  program args))
  83     (set-process-sentinel process 'ignore)
  84     (when passphrase
  85       (setenv "PGPPASSFD" "0")
  86       (process-send-string process (concat passphrase "\n")))
  87     (process-send-region process start end)
  88     (process-send-eof process)
  89     (while (eq 'run (process-status process))
  90       (accept-process-output process 5))
  91     (setq status (process-status process)
  92           exit-status (process-exit-status process))
  93     (delete-process process)
  94     (with-current-buffer output-buffer
  95       (goto-char (point-min))
  96       (while (search-forward "\r$" nil t)
  97         (replace-match ""))
  98       (if (memq status '(stop signal))
  99           (error "%s exited abnormally: '%s'" program exit-status))
 100       (if (= 127 exit-status)
 101           (error "%s could not be found" program))
 102
 103       (set-buffer (get-buffer-create errors-buffer))
 104       (buffer-disable-undo)
 105       (erase-buffer)
 106       (insert-file-contents errors-file-name)
 107       (delete-file errors-file-name)
 108
 109       (if (and process (eq 'run (process-status process)))
 110           (interrupt-process process))
 111       )
 112     ))
 113
 114 (luna-define-method lookup-key-string ((scheme pgg-scheme-pgp)
 115                                        string &optional type)
 116   (let ((args (list "+batchmode" "+language=en" "-kv" string)))
 117     (pgg-pgp-process-region (point)(point) nil
 118                             pgg-pgp-program args)
 119     (with-current-buffer pgg-output-buffer
 120       (goto-char (point-min))
 121       (cond
 122        ((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
 123         (buffer-substring (point)(+ 8 (point))))
 124        ((re-search-forward "^Type" nil t);PGP 6.*
 125         (beginning-of-line 2)
 126         (substring
 127          (nth 2 (split-string
 128                  (buffer-substring (point)
 129                                    (progn (end-of-line) (point)))
 130                  ))
 131          2))))
 132     ))
 133
 134 (luna-define-method encrypt-region ((scheme pgg-scheme-pgp)
 135                                     start end recipients)
 136   (let* ((pgg-pgp-user-id pgg-default-user-id)
 137          (passphrase
 138           (pgg-read-passphrase
 139            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 140            (luna-send scheme 'lookup-key-string
 141                       scheme pgg-pgp-user-id 'encrypt)))
 142          (args
 143           `("+encrypttoself=off +verbose=1" "+batchmode"
 144             "+language=us" "-fate"
 145             ,@(if recipients
 146                   (mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
 147                           recipients)))))
 148     (pgg-pgp-process-region start end passphrase
 149                             pgg-pgp-program args)
 150     (with-current-buffer pgg-output-buffer
 151       (if (zerop (buffer-size))
 152           (insert-buffer-substring pgg-errors-buffer)
 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     (with-current-buffer pgg-output-buffer
 174       (when (zerop (buffer-size))
 175         (insert-buffer-substring pgg-errors-buffer)))
 176     ))
 177
 178 (luna-define-method sign-region ((scheme pgg-scheme-pgp)
 179                                  start end)
 180   (let* ((pgg-pgp-user-id pgg-default-user-id)
 181          (passphrase
 182           (pgg-read-passphrase
 183            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 184            (luna-send scheme 'lookup-key-string
 185                       scheme pgg-pgp-user-id 'sign)))
 186          (args
 187           (list "-fbast" "+verbose=1" "+language=us" "+batchmode"
 188                 "-u" pgg-pgp-user-id)))
 189     (pgg-pgp-process-region start end passphrase
 190                              pgg-pgp-program args)
 191     (with-current-buffer pgg-output-buffer
 192       (if (zerop (buffer-size))
 193           (insert-buffer-substring pgg-errors-buffer)
 194         (let ((packet
 195                (cdr (assq 2 (pgg-parse-armor-region
 196                              (point-min)(point-max))))))
 197           (pgg-add-passphrase-cache
 198            (cdr (assq 'key-identifier packet))
 199            passphrase))))
 200     ))
 201
 202 (luna-define-method verify-region ((scheme pgg-scheme-pgp)
 203                                    start end &optional signature)
 204   (let* ((basename (expand-file-name "pgg" temporary-file-directory))
 205          (orig-file (make-temp-name basename))
 206          (args '("+verbose=1" "+batchmode" "+language=us")))
 207     (write-region-as-binary start end orig-file)
 208     (when (stringp signature)
 209       (copy-file signature (setq signature (concat orig-file ".asc")))
 210       (setq args (append args (list signature orig-file)))
 211       )
 212     (pgg-pgp-process-region (point-min)(point-max) nil
 213                             pgg-pgp-program args)
 214     (delete-file orig-file)
 215     (delete-file signature)
 216     (set-buffer pgg-output-buffer)
 217     (with-current-buffer pgg-output-buffer
 218       (when (zerop (buffer-size))
 219         (insert-buffer-substring pgg-errors-buffer)))
 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