pgg-pgp.el

   1 ;;; pgg-pgp.el --- PGP 2.* and 6.* 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-pgp ()
  32   "PGP 2.* and 6.* interface"
  33   :group 'pgg)
  34
  35 (defcustom pgg-pgp-program "pgp"
  36   "PGP 2.* and 6.* executable."
  37   :group 'pgg-pgp
  38   :type 'string)
  39
  40 (defcustom pgg-pgp-shell-file-name "/bin/sh"
  41   "File name to load inferior shells from.
  42 Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"."
  43   :group 'pgg-pgp
  44   :type 'string)
  45
  46 (defcustom pgg-pgp-shell-command-switch "-c"
  47   "Switch used to have the shell execute its command line argument."
  48   :group 'pgg-pgp
  49   :type 'string)
  50
  51 (defcustom pgg-pgp-extra-args nil
  52   "Extra arguments for every PGP invocation."
  53   :group 'pgg-pgp
  54   :type 'string)
  55
  56 (eval-and-compile
  57   (luna-define-class pgg-scheme-pgp (pgg-scheme)))
  58
  59 (defvar pgg-pgp-user-id nil
  60   "PGP ID of your default identity.")
  61
  62 (defvar pgg-pgp-messages-coding-system pgg-messages-coding-system
  63   "Coding system used when reading from a PGP external process.")
  64
  65 (defvar pgg-scheme-pgp-instance nil)
  66
  67 ;;;###autoload
  68 (defun pgg-make-scheme-pgp ()
  69   (or pgg-scheme-pgp-instance
  70       (setq pgg-scheme-pgp-instance
  71             (luna-make-entity 'pgg-scheme-pgp))))
  72
  73 (defun pgg-pgp-process-region (start end passphrase program args)
  74   (let* ((errors-file-name
  75           (concat temporary-file-directory
  76                   (make-temp-name "pgg-errors")))
  77          (args
  78           (append args
  79                   pgg-pgp-extra-args
  80                   (list (concat "2>" errors-file-name))))
  81          (shell-file-name pgg-pgp-shell-file-name)
  82          (shell-command-switch pgg-pgp-shell-command-switch)
  83          (process-environment process-environment)
  84          (output-buffer pgg-output-buffer)
  85          (errors-buffer pgg-errors-buffer)
  86          (process-connection-type nil)
  87          process status exit-status)
  88     (with-current-buffer (get-buffer-create output-buffer)
  89       (buffer-disable-undo)
  90       (erase-buffer))
  91     (when passphrase
  92       (setenv "PGPPASSFD" "0"))
  93     (unwind-protect
  94         (progn
  95           (setq process
  96                 (apply #'binary-to-text-funcall
  97                        pgg-pgp-messages-coding-system
  98                        #'start-process-shell-command "*PGP*" output-buffer
  99                        program args))
 100           (set-process-sentinel process #'ignore)
 101           (when passphrase
 102             (process-send-string process (concat passphrase "\n")))
 103           (process-send-region process start end)
 104           (process-send-eof process)
 105           (while (eq 'run (process-status process))
 106             (accept-process-output process 5))
 107           (setq status (process-status process)
 108                 exit-status (process-exit-status process))
 109           (delete-process process)
 110           (with-current-buffer output-buffer
 111             (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 112
 113             (if (memq status '(stop signal))
 114                 (error "%s exited abnormally: '%s'" program exit-status))
 115             (if (= 127 exit-status)
 116                 (error "%s could not be found" program))
 117
 118             (set-buffer (get-buffer-create errors-buffer))
 119             (buffer-disable-undo)
 120             (erase-buffer)
 121             (insert-file-contents errors-file-name)))
 122       (if (and process (eq 'run (process-status process)))
 123           (interrupt-process process))
 124       (condition-case nil
 125           (delete-file errors-file-name)
 126         (file-error nil)))))
 127
 128 (luna-define-method pgg-scheme-lookup-key ((scheme pgg-scheme-pgp)
 129                                                   string &optional type)
 130   (let ((args (list "+batchmode" "+language=en" "-kv" string)))
 131     (with-current-buffer (get-buffer-create pgg-output-buffer)
 132       (buffer-disable-undo)
 133       (erase-buffer)
 134       (apply #'call-process pgg-pgp-program nil t nil args)
 135       (goto-char (point-min))
 136       (cond
 137        ((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
 138         (buffer-substring (point)(+ 8 (point))))
 139        ((re-search-forward "^Type" nil t);PGP 6.*
 140         (beginning-of-line 2)
 141         (substring
 142          (nth 2 (split-string
 143                  (buffer-substring (point)(progn (end-of-line) (point)))))
 144          2))))))
 145
 146 (luna-define-method pgg-scheme-encrypt-region ((scheme pgg-scheme-pgp)
 147                                                start end recipients)
 148   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 149          (args
 150           `("+encrypttoself=off +verbose=1" "+batchmode"
 151             "+language=us" "-fate"
 152             ,@(if recipients
 153                   (mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
 154                           (append recipients
 155                                   (if pgg-encrypt-for-me
 156                                       (list pgg-pgp-user-id))))))))
 157     (pgg-pgp-process-region start end nil pgg-pgp-program args)
 158     (pgg-process-when-success nil)))
 159
 160 (luna-define-method pgg-scheme-decrypt-region ((scheme pgg-scheme-pgp)
 161                                                start end)
 162   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 163          (passphrase
 164           (pgg-read-passphrase
 165            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 166            (pgg-scheme-lookup-key scheme pgg-pgp-user-id 'encrypt)))
 167          (args
 168           '("+verbose=1" "+batchmode" "+language=us" "-f")))
 169     (pgg-pgp-process-region start end passphrase pgg-pgp-program args)
 170     (pgg-process-when-success nil)))
 171
 172 (luna-define-method pgg-scheme-sign-region ((scheme pgg-scheme-pgp)
 173                                             start end &optional clearsign)
 174   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 175          (passphrase
 176           (pgg-read-passphrase
 177            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 178            (pgg-scheme-lookup-key scheme pgg-pgp-user-id 'sign)))
 179          (args
 180           (list (if clearsign "-fast" "-fbast")
 181                 "+verbose=1" "+language=us" "+batchmode"
 182                 "-u" pgg-pgp-user-id)))
 183     (pgg-pgp-process-region start end passphrase pgg-pgp-program args)
 184     (pgg-process-when-success
 185       (goto-char (point-min))
 186       (when (re-search-forward "^-+BEGIN PGP" nil t);XXX
 187         (let ((packet
 188                (cdr (assq 2 (pgg-parse-armor-region
 189                              (progn (beginning-of-line 2)
 190                                     (point))
 191                              (point-max))))))
 192           (if pgg-cache-passphrase
 193               (pgg-add-passphrase-cache
 194                (cdr (assq 'key-identifier packet))
 195                passphrase)))))))
 196
 197 (luna-define-method pgg-scheme-verify-region ((scheme pgg-scheme-pgp)
 198                                               start end &optional signature)
 199   (let* ((basename (expand-file-name "pgg" temporary-file-directory))
 200          (orig-file (make-temp-name basename))
 201          (args '("+verbose=1" "+batchmode" "+language=us"))
 202          (orig-mode (default-file-modes)))
 203     (unwind-protect
 204         (progn
 205           (set-default-file-modes 448)
 206           (binary-write-decoded-region start end orig-file))
 207       (set-default-file-modes orig-mode))
 208     (when (stringp signature)
 209       (copy-file signature (setq signature (concat orig-file ".asc")))
 210       (setq args (append args (list signature orig-file))))
 211     (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
 212     (delete-file orig-file)
 213     (if signature (delete-file signature))
 214     (pgg-process-when-success
 215       (goto-char (point-min))
 216       (let ((case-fold-search t))
 217         (while (re-search-forward "^warning: " nil t)
 218           (delete-region (match-beginning 0)
 219                          (progn (beginning-of-line 2) (point)))))
 220       (goto-char (point-min))
 221       (when (re-search-forward "^\\.$" nil t)
 222         (delete-region (point-min)
 223                        (progn (beginning-of-line 2)
 224                               (point)))))))
 225
 226 (luna-define-method pgg-scheme-insert-key ((scheme pgg-scheme-pgp))
 227   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 228          (args
 229           (list "+verbose=1" "+batchmode" "+language=us" "-kxaf"
 230                 (concat "\"" pgg-pgp-user-id "\""))))
 231     (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
 232     (insert-buffer-substring pgg-output-buffer)))
 233
 234 (luna-define-method pgg-scheme-snarf-keys-region ((scheme pgg-scheme-pgp)
 235                                                   start end)
 236   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 237          (basename (expand-file-name "pgg" temporary-file-directory))
 238          (key-file (make-temp-name basename))
 239          (args
 240           (list "+verbose=1" "+batchmode" "+language=us" "-kaf"
 241                 key-file)))
 242     (let ((coding-system-for-write 'raw-text-dos))
 243       (write-region start end key-file))
 244     (pgg-pgp-process-region start end nil pgg-pgp-program args)
 245     (delete-file key-file)
 246     (pgg-process-when-success nil)))
 247
 248 (provide 'pgg-pgp)
 249
 250 ;;; pgg-pgp.el ends here