pgg-gpg.el

   1 ;;; pgg-gpg.el --- GnuPG support for PGG.
   2
   3 ;; Copyright (C) 1999 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   "The GnuPG executable."
  41   :group 'pgg-gpg
  42   :type 'string)
  43
  44 (defcustom pgg-gpg-extra-args nil
  45   "Extra arguments for every GnuPG invocation."
  46   :group 'pgg-gpg
  47   :type 'string)
  48
  49 (eval-and-compile
  50   (luna-define-class pgg-scheme-gpg (pgg-scheme))
  51   )
  52
  53 (defvar pgg-gpg-user-id nil
  54   "GnuPG ID of your default identity.")
  55
  56 (defvar pgg-scheme-gpg-instance nil)
  57
  58 ;;;###autoload
  59 (defun pgg-make-scheme-gpg ()
  60   (or pgg-scheme-gpg-instance
  61       (setq pgg-scheme-gpg-instance
  62             (luna-make-entity 'pgg-scheme-gpg))))
  63
  64 (defun pgg-gpg-process-region (start end passphrase program args)
  65   (let* ((errors-file-name
  66           (concat temporary-file-directory
  67                   (make-temp-name "pgg-errors")))
  68          (status-file-name
  69           (concat temporary-file-directory
  70                   (make-temp-name "pgg-status")))
  71          (args
  72           (append
  73            `("--status-fd" "3"
  74              ,@(if passphrase '("--passphrase-fd" "0"))
  75              ,@pgg-gpg-extra-args)
  76            args
  77            (list (concat "2>" errors-file-name)
  78                  (concat "3>" status-file-name))))
  79          (shell-file-name pgg-gpg-shell-file-name)
  80          (output-buffer pgg-output-buffer)
  81          (errors-buffer pgg-errors-buffer)
  82          (status-buffer pgg-status-buffer)
  83          (process-connection-type nil)
  84          process status exit-status)
  85     (with-current-buffer (get-buffer-create output-buffer)
  86       (buffer-disable-undo)
  87       (erase-buffer))
  88     (setq process
  89           (apply #'start-process-shell-command "*GnuPG*" output-buffer
  90                  program args))
  91     (set-process-sentinel process 'ignore)
  92     (when passphrase
  93       (process-send-string process (concat passphrase "\n")))
  94     (process-send-region process start end)
  95     (process-send-eof process)
  96     (while (eq 'run (process-status process))
  97       (accept-process-output process 5))
  98     (setq status (process-status process)
  99           exit-status (process-exit-status process))
 100     (delete-process process)
 101     (with-current-buffer output-buffer
 102       (goto-char (point-min))
 103       (while (search-forward "\r$" nil t)
 104         (replace-match ""))
 105       (if (memq status '(stop signal))
 106           (error "%s exited abnormally: '%s'" program exit-status))
 107       (if (= 127 exit-status)
 108           (error "%s could not be found" program))
 109
 110       (set-buffer (get-buffer-create errors-buffer))
 111       (buffer-disable-undo)
 112       (erase-buffer)
 113       (insert-file-contents errors-file-name)
 114       (delete-file errors-file-name)
 115
 116       (set-buffer (get-buffer-create status-buffer))
 117       (buffer-disable-undo)
 118       (erase-buffer)
 119       (insert-file-contents status-file-name)
 120       (delete-file status-file-name)
 121
 122       (if (and process (eq 'run (process-status process)))
 123           (interrupt-process process))
 124       )
 125     ))
 126
 127 (luna-define-method lookup-key-string ((scheme pgg-scheme-gpg)
 128                                        string &optional type)
 129   (let ((args (list "--with-colons" "--no-greeting" "--batch"
 130                     (if type "--list-secret-keys" "--list-keys")
 131                     string)))
 132     (pgg-gpg-process-region (point)(point) nil pgg-gpg-program args)
 133     (with-current-buffer pgg-output-buffer
 134       (goto-char (point-min))
 135       (when (re-search-forward "^\\(sec\\|pub\\):"  nil t)
 136         (substring
 137          (nth 3 (split-string
 138                  (buffer-substring (match-end 0)
 139                                    (progn (end-of-line)(point)))
 140                  ":"))
 141          8)))
 142     ))
 143
 144 (luna-define-method encrypt-region ((scheme pgg-scheme-gpg)
 145                                     start end recipients)
 146   (let* ((pgg-gpg-user-id pgg-default-user-id)
 147          (passphrase
 148           (pgg-read-passphrase
 149            (format "GnuPG passphrase for %s: " pgg-gpg-user-id)
 150            (luna-send scheme 'lookup-key-string
 151                       scheme pgg-gpg-user-id 'encrypt)))
 152          (args
 153           `("--batch" "--armor" "--textmode" "--always-trust" "--encrypt"
 154             ,@(if recipients
 155                   (apply #'append
 156                          (mapcar (lambda (rcpt)
 157                                    (list "--remote-user"
 158                                          (concat "\"" rcpt "\"")))
 159                                  recipients))))))
 160     (pgg-gpg-process-region start end passphrase pgg-gpg-program args)
 161     (with-current-buffer pgg-output-buffer
 162       (if (zerop (buffer-size))
 163           (insert-buffer-substring pgg-errors-buffer)
 164         (let ((packet
 165                (cdr (assq 1 (pgg-parse-armor-region
 166                              (point-min)(point-max))))))
 167           (pgg-add-passphrase-cache
 168            (cdr (assq 'key-identifier packet))
 169            passphrase))))
 170     ))
 171
 172 (luna-define-method decrypt-region ((scheme pgg-scheme-gpg)
 173                                     start end)
 174   (let* ((pgg-gpg-user-id pgg-default-user-id)
 175          (passphrase
 176           (pgg-read-passphrase
 177            (format "GnuPG passphrase for %s: " pgg-gpg-user-id)
 178            (luna-send scheme 'lookup-key-string
 179                       scheme pgg-gpg-user-id 'encrypt)))
 180          (args '("--batch" "--decrypt")))
 181     (pgg-gpg-process-region start end passphrase pgg-gpg-program args)
 182     (with-current-buffer pgg-output-buffer
 183       (when (zerop (buffer-size))
 184         (insert-buffer-substring pgg-errors-buffer)))
 185     ))
 186
 187 (luna-define-method sign-region ((scheme pgg-scheme-gpg)
 188                                  start end)
 189   (let* ((pgg-gpg-user-id pgg-default-user-id)
 190          (passphrase
 191           (pgg-read-passphrase
 192            (format "GnuPG passphrase for %s: " pgg-gpg-user-id)
 193            (luna-send scheme 'lookup-key-string
 194                       scheme pgg-gpg-user-id 'sign)))
 195          (args
 196           (list "--detach-sign" "--armor" "--batch" "--verbose"
 197                 "--local-user" pgg-gpg-user-id)))
 198     (goto-char start)
 199     (setq end (set-marker (make-marker) (point-max)))
 200     (while (progn (end-of-line) (> (marker-position end) (point)))
 201       (insert "\r")
 202       (forward-line 1))
 203     (pgg-gpg-process-region start end passphrase pgg-gpg-program args)
 204     (goto-char start)
 205     (while (re-search-forward "\r$" end t)
 206       (replace-match ""))
 207     (with-current-buffer pgg-output-buffer
 208       (if (zerop (buffer-size))
 209           (insert-buffer-substring pgg-errors-buffer)
 210         (let ((packet
 211                (cdr (assq 2 (pgg-parse-armor-region
 212                              (point-min)(point-max))))))
 213           (pgg-add-passphrase-cache
 214            (cdr (assq 'key-identifier packet))
 215            passphrase))))
 216     ))
 217
 218 (luna-define-method verify-region ((scheme pgg-scheme-gpg)
 219                                    start end &optional signature)
 220   (let ((args '("--batch" "--verify")))
 221     (when (stringp signature)
 222       (setq args (append args (list signature))))
 223     (pgg-gpg-process-region start end nil pgg-gpg-program args)
 224     (set-buffer pgg-errors-buffer)
 225     (goto-char (point-min))
 226     (while (re-search-forward "^gpg: " nil t)
 227       (replace-match ""))
 228     (goto-char (point-min))
 229     (let ((case-fold-search t))
 230       (while (re-search-forward "^warning: " nil t)
 231         (delete-region (match-beginning 0)
 232                        (progn (beginning-of-line 2) (point)))))
 233     (append-to-buffer pgg-output-buffer
 234                       (point-min)(point-max))
 235     ))
 236
 237 (luna-define-method insert-key ((scheme pgg-scheme-gpg))
 238   (let* ((pgg-gpg-user-id pgg-default-user-id)
 239          (args (list "--batch" "--export" "--armor"
 240                      (concat "\"" pgg-gpg-user-id "\""))))
 241     (pgg-gpg-process-region (point)(point) nil pgg-gpg-program args)
 242     (insert-buffer-substring pgg-output-buffer)
 243     ))
 244
 245 (luna-define-method snarf-keys-region ((scheme pgg-scheme-gpg)
 246                                        start end)
 247   (let ((args '("--import" "--batch")) status)
 248     (pgg-gpg-process-region start end nil pgg-gpg-program args)
 249     (set-buffer pgg-status-buffer)
 250     (goto-char (point-min))
 251     (when (re-search-forward "^\\[GNUPG:] +IMPORT_RES +" nil t)
 252       (setq status (buffer-substring (match-end 0)
 253                                      (progn (end-of-line)
 254                                             (point)))
 255             status (vconcat (split-string status)))
 256       (erase-buffer)
 257       (insert (aref status 0) "keys seen\n"
 258               (format "\t%d bad, %d new, %d old\n"
 259                       (string-to-int (aref status 1))
 260                       (+ (string-to-int (aref status 2))
 261                          (string-to-int (aref status 10)))
 262                       (+ (string-to-int (aref status 4))
 263                          (string-to-int (aref status 11))))
 264               (if (zerop (aref status 9))
 265                   ""
 266                 "\tSecret keys are imported\n")))
 267     (append-to-buffer pgg-output-buffer
 268                       (point-min)(point-max))
 269     (with-current-buffer pgg-output-buffer
 270       (when (zerop (buffer-size))
 271         (insert-buffer-substring pgg-errors-buffer)))
 272     ))
 273
 274 (provide 'pgg-gpg)
 275
 276 ;;; pgg-gpg.el ends here
 277