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       (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 104
 105       (if (memq status '(stop signal))
 106           (error "%s exited abnormally: '%s'" program exit-status))
 107       (if (= 127 exit-status)
 108           (error "%s could not be found" program))
 109
 110       (set-buffer (get-buffer-create errors-buffer))
 111       (buffer-disable-undo)
 112       (erase-buffer)
 113       (insert-file-contents errors-file-name)
 114       (delete-file errors-file-name)
 115
 116       (if (and process (eq 'run (process-status process)))
 117           (interrupt-process process))
 118       )
 119     ))
 120
 121 (luna-define-method lookup-key-string ((scheme pgg-scheme-pgp)
 122                                        string &optional type)
 123   (let ((args (list "+batchmode" "+language=en" "-kv" string)))
 124     (with-current-buffer (get-buffer-create pgg-output-buffer)
 125       (buffer-disable-undo)
 126       (erase-buffer)
 127       (apply #'call-process pgg-pgp-program nil t args)
 128       (goto-char (point-min))
 129       (cond
 130        ((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
 131         (buffer-substring (point)(+ 8 (point))))
 132        ((re-search-forward "^Type" nil t);PGP 6.*
 133         (beginning-of-line 2)
 134         (substring
 135          (nth 2 (split-string
 136                  (buffer-substring (point)
 137                                    (progn (end-of-line) (point)))
 138                  ))
 139          2))))
 140     ))
 141
 142 (luna-define-method encrypt-region ((scheme pgg-scheme-pgp)
 143                                     start end recipients)
 144   (let* ((pgg-pgp-user-id pgg-default-user-id)
 145          (args
 146           `("+encrypttoself=off +verbose=1" "+batchmode"
 147             "+language=us" "-fate"
 148             ,@(if recipients
 149                   (mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
 150                           (append recipients
 151                                   (if pgg-encrypt-for-me
 152                                       (list pgg-pgp-user-id))))))
 153           ))
 154     (pgg-pgp-process-region start end nil
 155                             pgg-pgp-program args)
 156     (pgg-process-when-success nil)
 157     ))
 158
 159 (luna-define-method decrypt-region ((scheme pgg-scheme-pgp)
 160                                     start end)
 161   (let* ((pgg-pgp-user-id pgg-default-user-id)
 162          (passphrase
 163           (pgg-read-passphrase
 164            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 165            (luna-send scheme 'lookup-key-string
 166                       scheme pgg-pgp-user-id 'encrypt)))
 167          (args
 168           '("+verbose=1" "+batchmode" "+language=us" "-f")))
 169     (pgg-pgp-process-region start end passphrase
 170                             pgg-pgp-program args)
 171     (pgg-process-when-success nil)
 172     ))
 173
 174 (luna-define-method sign-region ((scheme pgg-scheme-pgp)
 175                                  start end &optional clearsign)
 176   (let* ((pgg-pgp-user-id pgg-default-user-id)
 177          (passphrase
 178           (pgg-read-passphrase
 179            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 180            (luna-send scheme 'lookup-key-string
 181                       scheme pgg-pgp-user-id 'sign)))
 182          (args
 183           (list (if clearsign "-fast" "-fbast")
 184                 "+verbose=1" "+language=us" "+batchmode"
 185                 "-u" pgg-pgp-user-id))
 186          (inhibit-read-only t)
 187          buffer-read-only)
 188     (pgg-as-lbt start end 'CRLF
 189       (pgg-pgp-process-region start end passphrase
 190                               pgg-pgp-program args)
 191       )
 192     (pgg-process-when-success
 193       (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 194       (goto-char (point-min))
 195       (when (re-search-forward "^-+BEGIN PGP" nil t);XXX
 196         (let ((packet
 197                (cdr (assq 2 (pgg-parse-armor-region
 198                              (progn (beginning-of-line 2)
 199                                     (point))
 200                              (point-max))))))
 201           (pgg-add-passphrase-cache
 202            (cdr (assq 'key-identifier packet))
 203            passphrase))))
 204     ))
 205
 206 (luna-define-method verify-region ((scheme pgg-scheme-pgp)
 207                                    start end &optional signature)
 208   (let* ((basename (expand-file-name "pgg" temporary-file-directory))
 209          (orig-file (make-temp-name basename))
 210          (args '("+verbose=1" "+batchmode" "+language=us")))
 211     (write-region-as-binary start end orig-file)
 212     (when (stringp signature)
 213       (copy-file signature (setq signature (concat orig-file ".asc")))
 214       (setq args (append args (list signature orig-file)))
 215       )
 216     (pgg-pgp-process-region (point-min)(point-max) nil
 217                             pgg-pgp-program args)
 218     (delete-file orig-file)
 219     (if signature (delete-file signature))
 220     (pgg-process-when-success
 221       (goto-char (point-min))
 222       (let ((case-fold-search t))
 223         (while (re-search-forward "^warning: " nil t)
 224           (delete-region (match-beginning 0)
 225                          (progn (beginning-of-line 2) (point)))))
 226       (goto-char (point-min))
 227       (when (re-search-forward "^\\.$" nil t)
 228         (delete-region (point-min)
 229                        (progn (beginning-of-line 2)
 230                               (point)))))
 231     ))
 232
 233 (luna-define-method insert-key ((scheme pgg-scheme-pgp))
 234   (let* ((pgg-pgp-user-id pgg-default-user-id)
 235          (args
 236           (list "+verbose=1" "+batchmode" "+language=us" "-kxaf"
 237                 (concat "\"" pgg-pgp-user-id "\""))))
 238     (pgg-pgp-process-region (point)(point) nil
 239                              pgg-pgp-program args)
 240     (insert-buffer-substring pgg-output-buffer)
 241     ))
 242
 243 (luna-define-method snarf-keys-region ((scheme pgg-scheme-pgp)
 244                                        start end)
 245   (let* ((pgg-pgp-user-id pgg-default-user-id)
 246          (basename (expand-file-name "pgg" temporary-file-directory))
 247          (key-file (make-temp-name basename))
 248          (args
 249           (list "+verbose=1" "+batchmode" "+language=us" "-kaf"
 250                 key-file)))
 251     (write-region-as-raw-text-CRLF start end key-file)
 252     (pgg-pgp-process-region start end nil
 253                             pgg-pgp-program args)
 254     (delete-file key-file)
 255     (pgg-process-when-success nil)
 256     ))
 257
 258 (provide 'pgg-pgp)
 259
 260 ;;; pgg-pgp.el ends here