pgg-gpg.el

   1 ;;; pgg-gpg.el --- GnuPG support for PGG.
   2
   3 ;; Copyright (C) 1999,2000 Daiki Ueno
   4
   5 ;; Author: Daiki Ueno <ueno@ueda.info.waseda.ac.jp>
   6 ;; Created: 1999/10/28
   7 ;; Keywords: PGP, OpenPGP, GnuPG
   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-gpg ()
  31   "GnuPG interface"
  32   :group 'pgg)
  33
  34 (defcustom pgg-gpg-program "gpg"
  35   "The GnuPG executable."
  36   :group 'pgg-gpg
  37   :type 'string)
  38
  39 (defcustom pgg-gpg-shell-file-name "/bin/sh"
  40   "File name to load inferior shells from.
  41 Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"."
  42   :group 'pgg-gpg
  43   :type 'string)
  44
  45 (defcustom pgg-gpg-shell-command-switch "-c"
  46   "Switch used to have the shell execute its command line argument."
  47   :group 'pgg-gpg
  48   :type 'string)
  49
  50 (defcustom pgg-gpg-extra-args nil
  51   "Extra arguments for every GnuPG invocation."
  52   :group 'pgg-gpg
  53   :type 'string)
  54
  55 (eval-and-compile
  56   (luna-define-class pgg-scheme-gpg (pgg-scheme)))
  57
  58 (defvar pgg-gpg-user-id nil
  59   "GnuPG ID of your default identity.")
  60
  61 (defvar pgg-scheme-gpg-instance nil)
  62
  63 ;;;###autoload
  64 (defun pgg-make-scheme-gpg ()
  65   (or pgg-scheme-gpg-instance
  66       (setq pgg-scheme-gpg-instance
  67             (luna-make-entity 'pgg-scheme-gpg))))
  68
  69 (defun pgg-gpg-process-region (start end passphrase program args)
  70   (let* ((errors-file-name
  71           (concat temporary-file-directory
  72                   (make-temp-name "pgg-errors")))
  73          (status-file-name
  74           (concat temporary-file-directory
  75                   (make-temp-name "pgg-status")))
  76          (args
  77           (append
  78            `("--status-fd" "3"
  79              ,@(if passphrase '("--passphrase-fd" "0"))
  80              ,@pgg-gpg-extra-args)
  81            args
  82            (list (concat "2>" errors-file-name)
  83                  (concat "3>" status-file-name))))
  84          (shell-file-name pgg-gpg-shell-file-name)
  85          (shell-command-switch pgg-gpg-shell-command-switch)
  86          (output-buffer pgg-output-buffer)
  87          (errors-buffer pgg-errors-buffer)
  88          (status-buffer pgg-status-buffer)
  89          (process-connection-type nil)
  90          process status exit-status)
  91     (with-current-buffer (get-buffer-create output-buffer)
  92       (buffer-disable-undo)
  93       (erase-buffer))
  94     (as-binary-process
  95      (setq process
  96            (apply #'start-process-shell-command "*GnuPG*" output-buffer
  97                   program args)))
  98     (set-process-sentinel process #'ignore)
  99     (when passphrase
 100       (process-send-string process (concat passphrase "\n")))
 101     (process-send-region process start end)
 102     (process-send-eof process)
 103     (while (eq 'run (process-status process))
 104       (accept-process-output process 5))
 105     (setq status (process-status process)
 106           exit-status (process-exit-status process))
 107     (delete-process process)
 108     (with-current-buffer output-buffer
 109       (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 110
 111       (if (memq status '(stop signal))
 112           (error "%s exited abnormally: '%s'" program exit-status))
 113       (if (= 127 exit-status)
 114           (error "%s could not be found" program))
 115
 116       (set-buffer (get-buffer-create errors-buffer))
 117       (buffer-disable-undo)
 118       (erase-buffer)
 119       (insert-file-contents errors-file-name)
 120       (delete-file errors-file-name)
 121
 122       (set-buffer (get-buffer-create status-buffer))
 123       (buffer-disable-undo)
 124       (erase-buffer)
 125       (insert-file-contents status-file-name)
 126       (delete-file status-file-name)
 127
 128       (if (and process (eq 'run (process-status process)))
 129           (interrupt-process process)))))
 130
 131 (luna-define-method pgg-scheme-lookup-key ((scheme pgg-scheme-gpg)
 132                                            string &optional type)
 133   (let ((args (list "--with-colons" "--no-greeting" "--batch"
 134                     (if type "--list-secret-keys" "--list-keys")
 135                     string)))
 136     (with-current-buffer (get-buffer-create pgg-output-buffer)
 137       (buffer-disable-undo)
 138       (erase-buffer)
 139       (apply #'call-process pgg-gpg-program nil t nil args)
 140       (goto-char (point-min))
 141       (when (re-search-forward "^\\(sec\\|pub\\):"  nil t)
 142         (substring
 143          (nth 3 (split-string
 144                  (buffer-substring (match-end 0)
 145                                    (progn (end-of-line)(point)))
 146                  ":"))
 147          8)))))
 148
 149 (luna-define-method pgg-scheme-encrypt-region ((scheme pgg-scheme-gpg)
 150                                                start end recipients)
 151   (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
 152          (args
 153           `("--batch" "--armor" "--always-trust" "--encrypt"
 154             ,@(if recipients
 155                   (apply #'append
 156                          (mapcar (lambda (rcpt)
 157                                    (list "--remote-user"
 158                                          (concat "\"" rcpt "\"")))
 159                                  (append recipients
 160                                          (if pgg-encrypt-for-me
 161                                              (list pgg-gpg-user-id)))))))))
 162     (pgg-as-lbt start end 'CRLF
 163       (pgg-gpg-process-region start end nil pgg-gpg-program args))
 164     (pgg-process-when-success
 165       (pgg-convert-lbt-region (point-min)(point-max) 'LF))))
 166
 167 (luna-define-method pgg-scheme-decrypt-region ((scheme pgg-scheme-gpg)
 168                                                start end)
 169   (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
 170          (passphrase
 171           (pgg-read-passphrase
 172            (format "GnuPG passphrase for %s: " pgg-gpg-user-id)
 173            (pgg-scheme-lookup-key scheme pgg-gpg-user-id 'encrypt)))
 174          (args '("--batch" "--decrypt")))
 175     (pgg-gpg-process-region start end passphrase pgg-gpg-program args)
 176     (pgg-process-when-success nil)))
 177
 178 (luna-define-method pgg-scheme-sign-region ((scheme pgg-scheme-gpg)
 179                                             start end &optional cleartext)
 180   (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
 181          (passphrase
 182           (pgg-read-passphrase
 183            (format "GnuPG passphrase for %s: " pgg-gpg-user-id)
 184            (pgg-scheme-lookup-key scheme pgg-gpg-user-id 'sign)))
 185          (args
 186           (list (if cleartext "--clearsign" "--detach-sign")
 187                 "--armor" "--batch" "--verbose"
 188                 "--local-user" pgg-gpg-user-id))
 189          (inhibit-read-only t)
 190          buffer-read-only)
 191     (pgg-as-lbt start end 'CRLF
 192       (pgg-gpg-process-region start end passphrase pgg-gpg-program args))
 193     (pgg-process-when-success
 194       (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 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-cache
 203                (cdr (assq 'key-identifier packet))
 204                passphrase)))))))
 205
 206 (luna-define-method pgg-scheme-verify-region ((scheme pgg-scheme-gpg)
 207                                               start end &optional signature)
 208   (let ((args '("--batch" "--verify")))
 209     (when (stringp signature)
 210       (setq args (append args (list signature))))
 211     (pgg-gpg-process-region start end nil pgg-gpg-program args)
 212     (save-excursion
 213       (set-buffer pgg-errors-buffer)
 214       (goto-char (point-min))
 215       (while (re-search-forward "^gpg: " nil t)
 216         (replace-match ""))
 217       (goto-char (point-min))
 218       (let ((case-fold-search t))
 219         (while (re-search-forward "^warning: " nil t)
 220           (delete-region (match-beginning 0)
 221                          (progn (beginning-of-line 2) (point)))))
 222       (set-buffer pgg-status-buffer)
 223       (goto-char (point-min))
 224       (if (re-search-forward "^\\[GNUPG:] +GOODSIG +" nil t)
 225           (progn
 226             (set-buffer pgg-output-buffer)
 227             (insert-buffer-substring pgg-errors-buffer)
 228             t)
 229         nil))))
 230
 231 (luna-define-method pgg-scheme-insert-key ((scheme pgg-scheme-gpg))
 232   (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
 233          (args (list "--batch" "--export" "--armor"
 234                      (concat "\"" pgg-gpg-user-id "\""))))
 235     (pgg-gpg-process-region (point)(point) nil pgg-gpg-program args)
 236     (insert-buffer-substring pgg-output-buffer)))
 237
 238 (luna-define-method pgg-scheme-snarf-keys-region ((scheme pgg-scheme-gpg)
 239                                                   start end)
 240   (let ((args '("--import" "--batch" "-")) status)
 241     (pgg-gpg-process-region start end nil pgg-gpg-program args)
 242     (set-buffer pgg-status-buffer)
 243     (goto-char (point-min))
 244     (when (re-search-forward "^\\[GNUPG:] +IMPORT_RES +" nil t)
 245       (setq status (buffer-substring (match-end 0)
 246                                      (progn (end-of-line)
 247                                             (point)))
 248             status (vconcat (mapcar #'string-to-int
 249                                     (split-string status))))
 250       (erase-buffer)
 251       (insert (format "Imported %d key(s).
 252 \tArmor contains %d key(s) [%d bad, %d old].\n"
 253                       (+ (aref status 2)
 254                          (aref status 10))
 255                       (aref status 0)
 256                       (aref status 1)
 257                       (+ (aref status 4)
 258                          (aref status 11)))
 259               (if (zerop (aref status 9))
 260                   ""
 261                 "\tSecret keys are imported.\n")))
 262     (append-to-buffer pgg-output-buffer
 263                       (point-min)(point-max))
 264     (pgg-process-when-success nil)))
 265
 266 (provide 'pgg-gpg)
 267
 268 ;;; pgg-gpg.el ends here