lisp/pgg-pgp5.el

   1 ;;; pgg-pgp5.el --- PGP 5.* support for PGG.
   2
   3 ;; Copyright (C) 1999, 2000, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   5
   6 ;; Author: Daiki Ueno <ueno@unixuser.org>
   7 ;; Created: 1999/11/02
   8 ;; Keywords: PGP, OpenPGP
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Code:
  26
  27 (eval-when-compile
  28   (require 'cl)                         ; for pgg macros
  29   (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 '(choice
  70           (const :tag "None" nil)
  71           (string :tag "Arguments")))
  72
  73 (defvar pgg-pgp5-user-id nil
  74   "PGP 5.* ID of your default identity.")
  75
  76 (defun pgg-pgp5-process-region (start end passphrase program args)
  77   (let* ((errors-file-name (pgg-make-temp-file "pgg-errors"))
  78          (args
  79           (append args
  80                   pgg-pgp5-extra-args
  81                   (list (concat "2>" errors-file-name))))
  82          (shell-file-name pgg-pgp5-shell-file-name)
  83          (shell-command-switch pgg-pgp5-shell-command-switch)
  84          (process-environment process-environment)
  85          (output-buffer pgg-output-buffer)
  86          (errors-buffer pgg-errors-buffer)
  87          (process-connection-type nil)
  88          process status exit-status)
  89     (with-current-buffer (get-buffer-create output-buffer)
  90       (buffer-disable-undo)
  91       (erase-buffer))
  92     (when passphrase
  93       (setenv "PGPPASSFD" "0"))
  94     (unwind-protect
  95         (progn
  96           (let ((coding-system-for-read 'binary)
  97                 (coding-system-for-write 'binary))
  98             (setq process
  99                   (apply #'funcall
 100                          #'start-process-shell-command "*PGP*" output-buffer
 101                          program args)))
 102           (set-process-sentinel process #'ignore)
 103           (when passphrase
 104             (process-send-string process (concat passphrase "\n")))
 105           (process-send-region process start end)
 106           (process-send-eof process)
 107           (while (eq 'run (process-status process))
 108             (accept-process-output process 5))
 109           (setq status (process-status process)
 110                 exit-status (process-exit-status process))
 111           (delete-process process)
 112           (with-current-buffer output-buffer
 113             (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 114
 115             (if (memq status '(stop signal))
 116                 (error "%s exited abnormally: '%s'" program exit-status))
 117             (if (= 127 exit-status)
 118                 (error "%s could not be found" program))
 119
 120             (set-buffer (get-buffer-create errors-buffer))
 121             (buffer-disable-undo)
 122             (erase-buffer)
 123             (insert-file-contents errors-file-name)))
 124       (if (and process (eq 'run (process-status process)))
 125           (interrupt-process process))
 126       (condition-case nil
 127           (delete-file errors-file-name)
 128         (file-error nil)))))
 129
 130 (defun pgg-pgp5-lookup-key (string &optional type)
 131   "Search keys associated with STRING."
 132   (let ((args (list "+language=en" "-l" string)))
 133     (with-current-buffer (get-buffer-create pgg-output-buffer)
 134       (buffer-disable-undo)
 135       (erase-buffer)
 136       (apply #'call-process pgg-pgp5-pgpk-program nil t nil args)
 137       (goto-char (point-min))
 138       (when (re-search-forward "^sec" nil t)
 139         (substring
 140          (nth 2 (split-string
 141                  (buffer-substring (match-end 0)(progn (end-of-line)(point)))))
 142          2)))))
 143
 144 (defun pgg-pgp5-encrypt-region (start end recipients &optional sign passphrase)
 145   "Encrypt the current region between START and END."
 146   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 147          (passphrase (or passphrase
 148                          (when sign
 149                            (pgg-read-passphrase
 150                             (format "PGP passphrase for %s: "
 151                                     pgg-pgp5-user-id)
 152                             pgg-pgp5-user-id))))
 153          (args
 154           (append
 155            `("+NoBatchInvalidKeys=off" "-fat" "+batchmode=1"
 156              ,@(if (or recipients pgg-encrypt-for-me)
 157                    (apply #'append
 158                           (mapcar (lambda (rcpt)
 159                                     (list "-r"
 160                                           (concat "\"" rcpt "\"")))
 161                                   (append recipients
 162                                           (if pgg-encrypt-for-me
 163                                               (list pgg-pgp5-user-id)))))))
 164            (if sign '("-s" "-u" pgg-pgp5-user-id)))))
 165     (pgg-pgp5-process-region start end nil pgg-pgp5-pgpe-program args)
 166     (pgg-process-when-success nil)))
 167
 168 (defun pgg-pgp5-decrypt-region (start end &optional passphrase)
 169   "Decrypt the current region between START and END."
 170   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 171          (passphrase
 172           (or passphrase
 173               (pgg-read-passphrase
 174                (format "PGP passphrase for %s: " pgg-pgp5-user-id)
 175                (pgg-pgp5-lookup-key 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 (defun pgg-pgp5-sign-region (start end &optional clearsign passphrase)
 182   "Make detached signature from text between START and END."
 183   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 184          (passphrase
 185           (or passphrase
 186               (pgg-read-passphrase
 187                (format "PGP passphrase for %s: " pgg-pgp5-user-id)
 188                (pgg-pgp5-lookup-key pgg-pgp5-user-id 'sign))))
 189          (args
 190           (list (if clearsign "-fat" "-fbat")
 191                 "+verbose=1" "+language=us" "+batchmode=1"
 192                 "-u" pgg-pgp5-user-id)))
 193     (pgg-pgp5-process-region start end passphrase pgg-pgp5-pgps-program args)
 194     (pgg-process-when-success
 195       (when (re-search-forward "^-+BEGIN PGP SIGNATURE" 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           (if pgg-cache-passphrase
 202               (pgg-add-passphrase-to-cache
 203                (cdr (assq 'key-identifier packet))
 204                passphrase)))))))
 205
 206 (defun pgg-pgp5-verify-region (start end &optional signature)
 207   "Verify region between START and END as the detached signature SIGNATURE."
 208   (let ((orig-file (pgg-make-temp-file "pgg"))
 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           (let ((coding-system-for-write 'binary)
 215                 jka-compr-compression-info-list jam-zcat-filename-list)
 216             (write-region start end orig-file)))
 217       (set-default-file-modes orig-mode))
 218     (when (stringp signature)
 219       (copy-file signature (setq signature (concat orig-file ".asc")))
 220       (setq args (append args (list signature))))
 221     (pgg-pgp5-process-region (point)(point) nil pgg-pgp5-pgpv-program args)
 222     (delete-file orig-file)
 223     (if signature (delete-file signature))
 224     (with-current-buffer pgg-errors-buffer
 225       (goto-char (point-min))
 226       (if (re-search-forward "^Good signature" nil t)
 227           (progn
 228             (set-buffer pgg-output-buffer)
 229             (insert-buffer-substring pgg-errors-buffer)
 230             t)
 231         nil))))
 232
 233 (defun pgg-pgp5-insert-key ()
 234   "Insert public key at point."
 235   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 236          (args
 237           (list "+verbose=1" "+batchmode=1" "+language=us" "-x"
 238                 (concat "\"" pgg-pgp5-user-id "\""))))
 239     (pgg-pgp5-process-region (point)(point) nil pgg-pgp5-pgpk-program args)
 240     (insert-buffer-substring pgg-output-buffer)))
 241
 242 (defun pgg-pgp5-snarf-keys-region (start end)
 243   "Add all public keys in region between START and END to the keyring."
 244   (let* ((pgg-pgp5-user-id (or pgg-pgp5-user-id pgg-default-user-id))
 245          (key-file (pgg-make-temp-file "pgg"))
 246          (args
 247           (list "+verbose=1" "+batchmode=1" "+language=us" "-a"
 248                 key-file)))
 249     (let ((coding-system-for-write 'raw-text-dos))
 250       (write-region start end key-file))
 251     (pgg-pgp5-process-region start end nil pgg-pgp5-pgpk-program args)
 252     (delete-file key-file)
 253     (pgg-process-when-success nil)))
 254
 255 (provide 'pgg-pgp5)
 256
 257 ;; arch-tag: 3dbd1073-6b3a-466c-9f55-5c587ffa6d7b
 258 ;;; pgg-pgp5.el ends here