lisp/pgg-pgp.el

   1 ;;; pgg-pgp.el --- PGP 2.* and 6.* support for PGG.
   2
   3 ;; Copyright (C) 1999, 2000, 2002, 2003, 2004,
   4 ;;   2005 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 2, or (at your option)
  15 ;; 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; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Code:
  28
  29 (eval-when-compile
  30   (require 'cl)                         ; for pgg macros
  31   (require 'pgg))
  32
  33 (defgroup pgg-pgp ()
  34   "PGP 2.* and 6.* interface."
  35   :group 'pgg)
  36
  37 (defcustom pgg-pgp-program "pgp"
  38   "PGP 2.* and 6.* executable."
  39   :group 'pgg-pgp
  40   :type 'string)
  41
  42 (defcustom pgg-pgp-shell-file-name "/bin/sh"
  43   "File name to load inferior shells from.
  44 Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"."
  45   :group 'pgg-pgp
  46   :type 'string)
  47
  48 (defcustom pgg-pgp-shell-command-switch "-c"
  49   "Switch used to have the shell execute its command line argument."
  50   :group 'pgg-pgp
  51   :type 'string)
  52
  53 (defcustom pgg-pgp-extra-args nil
  54   "Extra arguments for every PGP invocation."
  55   :group 'pgg-pgp
  56   :type '(choice
  57           (const :tag "None" nil)
  58           (string :tag "Arguments")))
  59
  60 (defvar pgg-pgp-user-id nil
  61   "PGP ID of your default identity.")
  62
  63 (defun pgg-pgp-process-region (start end passphrase program args)
  64   (let* ((errors-file-name (pgg-make-temp-file "pgg-errors"))
  65          (args
  66           (append args
  67                   pgg-pgp-extra-args
  68                   (list (concat "2>" errors-file-name))))
  69          (shell-file-name pgg-pgp-shell-file-name)
  70          (shell-command-switch pgg-pgp-shell-command-switch)
  71          (process-environment process-environment)
  72          (output-buffer pgg-output-buffer)
  73          (errors-buffer pgg-errors-buffer)
  74          (process-connection-type nil)
  75          process status exit-status)
  76     (with-current-buffer (get-buffer-create output-buffer)
  77       (buffer-disable-undo)
  78       (erase-buffer))
  79     (when passphrase
  80       (setenv "PGPPASSFD" "0"))
  81     (unwind-protect
  82         (progn
  83           (let ((coding-system-for-read 'binary)
  84                 (coding-system-for-write 'binary))
  85             (setq process
  86                   (apply #'funcall
  87                          #'start-process-shell-command "*PGP*" output-buffer
  88                          program args)))
  89           (set-process-sentinel process #'ignore)
  90           (when passphrase
  91             (process-send-string process (concat passphrase "\n")))
  92           (process-send-region process start end)
  93           (process-send-eof process)
  94           (while (eq 'run (process-status process))
  95             (accept-process-output process 5))
  96           (setq status (process-status process)
  97                 exit-status (process-exit-status process))
  98           (delete-process process)
  99           (with-current-buffer output-buffer
 100             (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 101
 102             (if (memq status '(stop signal))
 103                 (error "%s exited abnormally: '%s'" program exit-status))
 104             (if (= 127 exit-status)
 105                 (error "%s could not be found" program))
 106
 107             (set-buffer (get-buffer-create errors-buffer))
 108             (buffer-disable-undo)
 109             (erase-buffer)
 110             (insert-file-contents errors-file-name)))
 111       (if (and process (eq 'run (process-status process)))
 112           (interrupt-process process))
 113       (condition-case nil
 114           (delete-file errors-file-name)
 115         (file-error nil)))))
 116
 117 (defun pgg-pgp-lookup-key (string &optional type)
 118   "Search keys associated with STRING."
 119   (let ((args (list "+batchmode" "+language=en" "-kv" string)))
 120     (with-current-buffer (get-buffer-create pgg-output-buffer)
 121       (buffer-disable-undo)
 122       (erase-buffer)
 123       (apply #'call-process pgg-pgp-program nil t nil args)
 124       (goto-char (point-min))
 125       (cond
 126        ((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
 127         (buffer-substring (point)(+ 8 (point))))
 128        ((re-search-forward "^Type" nil t);PGP 6.*
 129         (beginning-of-line 2)
 130         (substring
 131          (nth 2 (split-string
 132                  (buffer-substring (point)(progn (end-of-line) (point)))))
 133          2))))))
 134
 135 (defun pgg-pgp-encrypt-region (start end recipients)
 136   "Encrypt the current region between START and END."
 137   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 138          (args
 139           `("+encrypttoself=off +verbose=1" "+batchmode"
 140             "+language=us" "-fate"
 141             ,@(if recipients
 142                   (mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
 143                           (append recipients
 144                                   (if pgg-encrypt-for-me
 145                                       (list pgg-pgp-user-id))))))))
 146     (pgg-pgp-process-region start end nil pgg-pgp-program args)
 147     (pgg-process-when-success nil)))
 148
 149 (defun pgg-pgp-decrypt-region (start end)
 150   "Decrypt the current region between START and END."
 151   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 152          (key (pgg-pgp-lookup-key pgg-pgp-user-id 'encrypt))
 153          (passphrase
 154           (pgg-read-passphrase
 155            (format "PGP passphrase for %s: " pgg-pgp-user-id) key))
 156          (args
 157           '("+verbose=1" "+batchmode" "+language=us" "-f")))
 158     (pgg-pgp-process-region start end passphrase pgg-pgp-program args)
 159     (pgg-process-when-success
 160       (if pgg-cache-passphrase
 161           (pgg-add-passphrase-cache key passphrase)))))
 162
 163 (defun pgg-pgp-sign-region (start end &optional clearsign)
 164   "Make detached signature from text between START and END."
 165   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 166          (passphrase
 167           (pgg-read-passphrase
 168            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 169            (pgg-pgp-lookup-key pgg-pgp-user-id 'sign)))
 170          (args
 171           (list (if clearsign "-fast" "-fbast")
 172                 "+verbose=1" "+language=us" "+batchmode"
 173                 "-u" pgg-pgp-user-id)))
 174     (pgg-pgp-process-region start end passphrase pgg-pgp-program args)
 175     (pgg-process-when-success
 176       (goto-char (point-min))
 177       (when (re-search-forward "^-+BEGIN PGP" nil t);XXX
 178         (let ((packet
 179                (cdr (assq 2 (pgg-parse-armor-region
 180                              (progn (beginning-of-line 2)
 181                                     (point))
 182                              (point-max))))))
 183           (if pgg-cache-passphrase
 184               (pgg-add-passphrase-cache
 185                (cdr (assq 'key-identifier packet))
 186                passphrase)))))))
 187
 188 (defun pgg-pgp-verify-region (start end &optional signature)
 189   "Verify region between START and END as the detached signature SIGNATURE."
 190   (let* ((orig-file (pgg-make-temp-file "pgg"))
 191          (args '("+verbose=1" "+batchmode" "+language=us"))
 192          (orig-mode (default-file-modes)))
 193     (unwind-protect
 194         (progn
 195           (set-default-file-modes 448)
 196           (let ((coding-system-for-write 'binary)
 197                 jka-compr-compression-info-list jam-zcat-filename-list)
 198             (write-region start end orig-file)))
 199       (set-default-file-modes orig-mode))
 200     (if (stringp signature)
 201         (progn
 202           (copy-file signature (setq signature (concat orig-file ".asc")))
 203           (setq args (append args (list signature orig-file))))
 204       (setq args (append args (list orig-file))))
 205     (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
 206     (delete-file orig-file)
 207     (if signature (delete-file signature))
 208     (pgg-process-when-success
 209       (goto-char (point-min))
 210       (let ((case-fold-search t))
 211         (while (re-search-forward "^warning: " nil t)
 212           (delete-region (match-beginning 0)
 213                          (progn (beginning-of-line 2) (point)))))
 214       (goto-char (point-min))
 215       (when (re-search-forward "^\\.$" nil t)
 216         (delete-region (point-min)
 217                        (progn (beginning-of-line 2)
 218                               (point)))))))
 219
 220 (defun pgg-pgp-insert-key ()
 221   "Insert public key at point."
 222   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 223          (args
 224           (list "+verbose=1" "+batchmode" "+language=us" "-kxaf"
 225                 (concat "\"" pgg-pgp-user-id "\""))))
 226     (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
 227     (insert-buffer-substring pgg-output-buffer)))
 228
 229 (defun pgg-pgp-snarf-keys-region (start end)
 230   "Add all public keys in region between START and END to the keyring."
 231   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 232          (key-file (pgg-make-temp-file "pgg"))
 233          (args
 234           (list "+verbose=1" "+batchmode" "+language=us" "-kaf"
 235                 key-file)))
 236     (let ((coding-system-for-write 'raw-text-dos))
 237       (write-region start end key-file))
 238     (pgg-pgp-process-region start end nil pgg-pgp-program args)
 239     (delete-file key-file)
 240     (pgg-process-when-success nil)))
 241
 242 (provide 'pgg-pgp)
 243
 244 ;;; arch-tag: 076b7801-37b2-49a6-97c3-218fdecde33c
 245 ;;; pgg-pgp.el ends here