lisp/gnus/pgg-pgp.el

   1 ;;; pgg-pgp.el --- PGP 2.* and 6.* support for PGG.
   2
   3 ;; Copyright (C) 1999, 2000, 2003 Free Software Foundation, Inc.
   4
   5 ;; Author: Daiki Ueno <ueno@unixuser.org>
   6 ;; Created: 1999/11/02
   7 ;; Keywords: PGP, OpenPGP
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU 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
  29   (require 'cl)                         ; for pgg macros
  30   (require 'pgg))
  31
  32 (defgroup pgg-pgp ()
  33   "PGP 2.* and 6.* interface"
  34   :group 'pgg)
  35
  36 (defcustom pgg-pgp-program "pgp"
  37   "PGP 2.* and 6.* executable."
  38   :group 'pgg-pgp
  39   :type 'string)
  40
  41 (defcustom pgg-pgp-shell-file-name "/bin/sh"
  42   "File name to load inferior shells from.
  43 Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"."
  44   :group 'pgg-pgp
  45   :type 'string)
  46
  47 (defcustom pgg-pgp-shell-command-switch "-c"
  48   "Switch used to have the shell execute its command line argument."
  49   :group 'pgg-pgp
  50   :type 'string)
  51
  52 (defcustom pgg-pgp-extra-args nil
  53   "Extra arguments for every PGP invocation."
  54   :group 'pgg-pgp
  55   :type '(choice
  56           (const :tag "None" nil)
  57           (string :tag "Arguments")))
  58
  59 (defvar pgg-pgp-user-id nil
  60   "PGP ID of your default identity.")
  61
  62 (defun pgg-pgp-process-region (start end passphrase program args)
  63   (let* ((errors-file-name (pgg-make-temp-file "pgg-errors"))
  64          (args
  65           (append args
  66                   pgg-pgp-extra-args
  67                   (list (concat "2>" errors-file-name))))
  68          (shell-file-name pgg-pgp-shell-file-name)
  69          (shell-command-switch pgg-pgp-shell-command-switch)
  70          (process-environment process-environment)
  71          (output-buffer pgg-output-buffer)
  72          (errors-buffer pgg-errors-buffer)
  73          (process-connection-type nil)
  74          process status exit-status)
  75     (with-current-buffer (get-buffer-create output-buffer)
  76       (buffer-disable-undo)
  77       (erase-buffer))
  78     (when passphrase
  79       (setenv "PGPPASSFD" "0"))
  80     (unwind-protect
  81         (progn
  82           (let ((coding-system-for-read 'binary)
  83                 (coding-system-for-write 'binary))
  84             (setq process
  85                   (apply #'funcall
  86                          #'start-process-shell-command "*PGP*" output-buffer
  87                          program args)))
  88           (set-process-sentinel process #'ignore)
  89           (when passphrase
  90             (process-send-string process (concat passphrase "\n")))
  91           (process-send-region process start end)
  92           (process-send-eof process)
  93           (while (eq 'run (process-status process))
  94             (accept-process-output process 5))
  95           (setq status (process-status process)
  96                 exit-status (process-exit-status process))
  97           (delete-process process)
  98           (with-current-buffer output-buffer
  99             (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 100
 101             (if (memq status '(stop signal))
 102                 (error "%s exited abnormally: '%s'" program exit-status))
 103             (if (= 127 exit-status)
 104                 (error "%s could not be found" program))
 105
 106             (set-buffer (get-buffer-create errors-buffer))
 107             (buffer-disable-undo)
 108             (erase-buffer)
 109             (insert-file-contents errors-file-name)))
 110       (if (and process (eq 'run (process-status process)))
 111           (interrupt-process process))
 112       (condition-case nil
 113           (delete-file errors-file-name)
 114         (file-error nil)))))
 115
 116 (defun pgg-pgp-lookup-key (string &optional type)
 117   "Search keys associated with STRING."
 118   (let ((args (list "+batchmode" "+language=en" "-kv" string)))
 119     (with-current-buffer (get-buffer-create pgg-output-buffer)
 120       (buffer-disable-undo)
 121       (erase-buffer)
 122       (apply #'call-process pgg-pgp-program nil t nil args)
 123       (goto-char (point-min))
 124       (cond
 125        ((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
 126         (buffer-substring (point)(+ 8 (point))))
 127        ((re-search-forward "^Type" nil t);PGP 6.*
 128         (beginning-of-line 2)
 129         (substring
 130          (nth 2 (split-string
 131                  (buffer-substring (point)(progn (end-of-line) (point)))))
 132          2))))))
 133
 134 (defun pgg-pgp-encrypt-region (start end recipients)
 135   "Encrypt the current region between START and END."
 136   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 137          (args
 138           `("+encrypttoself=off +verbose=1" "+batchmode"
 139             "+language=us" "-fate"
 140             ,@(if recipients
 141                   (mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
 142                           (append recipients
 143                                   (if pgg-encrypt-for-me
 144                                       (list pgg-pgp-user-id))))))))
 145     (pgg-pgp-process-region start end nil pgg-pgp-program args)
 146     (pgg-process-when-success nil)))
 147
 148 (defun pgg-pgp-decrypt-region (start end)
 149   "Decrypt the current region between START and END."
 150   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 151          (passphrase
 152           (pgg-read-passphrase
 153            (format "PGP passphrase for %s: " pgg-pgp-user-id)
 154            (pgg-pgp-lookup-key pgg-pgp-user-id 'encrypt)))
 155          (args
 156           '("+verbose=1" "+batchmode" "+language=us" "-f")))
 157     (pgg-pgp-process-region start end passphrase pgg-pgp-program args)
 158     (pgg-process-when-success nil)))
 159
 160 (defun pgg-pgp-sign-region (start end &optional clearsign)
 161   "Make detached signature from text between START and 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-pgp-lookup-key pgg-pgp-user-id 'sign)))
 167          (args
 168           (list (if clearsign "-fast" "-fbast")
 169                 "+verbose=1" "+language=us" "+batchmode"
 170                 "-u" pgg-pgp-user-id)))
 171     (pgg-pgp-process-region start end passphrase pgg-pgp-program args)
 172     (pgg-process-when-success
 173       (goto-char (point-min))
 174       (when (re-search-forward "^-+BEGIN PGP" nil t);XXX
 175         (let ((packet
 176                (cdr (assq 2 (pgg-parse-armor-region
 177                              (progn (beginning-of-line 2)
 178                                     (point))
 179                              (point-max))))))
 180           (if pgg-cache-passphrase
 181               (pgg-add-passphrase-cache
 182                (cdr (assq 'key-identifier packet))
 183                passphrase)))))))
 184
 185 (defun pgg-pgp-verify-region (start end &optional signature)
 186   "Verify region between START and END as the detached signature SIGNATURE."
 187   (let* ((orig-file (pgg-make-temp-file "pgg"))
 188          (args '("+verbose=1" "+batchmode" "+language=us"))
 189          (orig-mode (default-file-modes)))
 190     (unwind-protect
 191         (progn
 192           (set-default-file-modes 448)
 193           (let ((coding-system-for-write 'binary)
 194                 jka-compr-compression-info-list jam-zcat-filename-list)
 195             (write-region start end orig-file)))
 196       (set-default-file-modes orig-mode))
 197     (if (stringp signature)
 198         (progn
 199           (copy-file signature (setq signature (concat orig-file ".asc")))
 200           (setq args (append args (list signature orig-file))))
 201       (setq args (append args (list orig-file))))
 202     (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
 203     (delete-file orig-file)
 204     (if signature (delete-file signature))
 205     (pgg-process-when-success
 206       (goto-char (point-min))
 207       (let ((case-fold-search t))
 208         (while (re-search-forward "^warning: " nil t)
 209           (delete-region (match-beginning 0)
 210                          (progn (beginning-of-line 2) (point)))))
 211       (goto-char (point-min))
 212       (when (re-search-forward "^\\.$" nil t)
 213         (delete-region (point-min)
 214                        (progn (beginning-of-line 2)
 215                               (point)))))))
 216
 217 (defun pgg-pgp-insert-key ()
 218   "Insert public key at point."
 219   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 220          (args
 221           (list "+verbose=1" "+batchmode" "+language=us" "-kxaf"
 222                 (concat "\"" pgg-pgp-user-id "\""))))
 223     (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
 224     (insert-buffer-substring pgg-output-buffer)))
 225
 226 (defun pgg-pgp-snarf-keys-region (start end)
 227   "Add all public keys in region between START and END to the keyring."
 228   (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
 229          (key-file (pgg-make-temp-file "pgg"))
 230          (args
 231           (list "+verbose=1" "+batchmode" "+language=us" "-kaf"
 232                 key-file)))
 233     (let ((coding-system-for-write 'raw-text-dos))
 234       (write-region start end key-file))
 235     (pgg-pgp-process-region start end nil pgg-pgp-program args)
 236     (delete-file key-file)
 237     (pgg-process-when-success nil)))
 238
 239 (provide 'pgg-pgp)
 240
 241 ;;; arch-tag: 076b7801-37b2-49a6-97c3-218fdecde33c
 242 ;;; pgg-pgp.el ends here