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   "File name to load inferior shells from.  Bourne shell or its equivalent
  41 \(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
  59 (defvar pgg-gpg-user-id nil
  60   "GnuPG ID of your default identity.")
  61
  62 (defvar pgg-scheme-gpg-instance nil)
  63
  64 ;;;###autoload
  65 (defun pgg-make-scheme-gpg ()
  66   (or pgg-scheme-gpg-instance
  67       (setq pgg-scheme-gpg-instance
  68             (luna-make-entity 'pgg-scheme-gpg))))
  69
  70 (defun pgg-gpg-process-region (start end passphrase program args)
  71   (let* ((errors-file-name
  72           (concat temporary-file-directory
  73                   (make-temp-name "pgg-errors")))
  74          (status-file-name
  75           (concat temporary-file-directory
  76                   (make-temp-name "pgg-status")))
  77          (args
  78           (append
  79            `("--status-fd" "3"
  80              ,@(if passphrase '("--passphrase-fd" "0"))
  81              ,@pgg-gpg-extra-args)
  82            args
  83            (list (concat "2>" errors-file-name)
  84                  (concat "3>" status-file-name))))
  85          (shell-file-name pgg-gpg-shell-file-name)
  86          (shell-command-switch pgg-gpg-shell-command-switch)
  87          (output-buffer pgg-output-buffer)
  88          (errors-buffer pgg-errors-buffer)
  89          (status-buffer pgg-status-buffer)
  90          (process-connection-type nil)
  91          process status exit-status)
  92     (with-current-buffer (get-buffer-create output-buffer)
  93       (buffer-disable-undo)
  94       (erase-buffer))
  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     ))
 132
 133 (luna-define-method lookup-key-string ((scheme pgg-scheme-gpg)
 134                                        string &optional type)
 135   (let ((args (list "--with-colons" "--no-greeting" "--batch"
 136                     (if type "--list-secret-keys" "--list-keys")
 137                     string)))
 138     (pgg-gpg-process-region (point)(point) nil pgg-gpg-program args)
 139     (with-current-buffer pgg-output-buffer
 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
 150 (luna-define-method encrypt-region ((scheme pgg-scheme-gpg)
 151                                     start end recipients)
 152   (let* ((pgg-gpg-user-id pgg-default-user-id)
 153          (passphrase
 154           (pgg-read-passphrase
 155            (format "GnuPG passphrase for %s: " pgg-gpg-user-id)
 156            (luna-send scheme 'lookup-key-string
 157                       scheme pgg-gpg-user-id 'encrypt)))
 158          (args
 159           `("--batch" "--armor" "--always-trust" "--encrypt"
 160             ,@(if recipients
 161                   (apply #'append
 162                          (mapcar (lambda (rcpt)
 163                                    (list "--remote-user"
 164                                          (concat "\"" rcpt "\"")))
 165                                  recipients))))))
 166     (pgg-as-lbt start end 'CRLF
 167       (pgg-gpg-process-region start end passphrase
 168                               pgg-gpg-program args)
 169       )
 170     (pgg-process-when-success
 171       (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 172       (let ((packet
 173              (cdr (assq 1 (pgg-parse-armor-region
 174                            (point-min)(point-max))))))
 175         (pgg-add-passphrase-cache
 176          (cdr (assq 'key-identifier packet))
 177          passphrase)))
 178     ))
 179
 180 (luna-define-method decrypt-region ((scheme pgg-scheme-gpg)
 181                                     start end)
 182   (let* ((pgg-gpg-user-id pgg-default-user-id)
 183          (passphrase
 184           (pgg-read-passphrase
 185            (format "GnuPG passphrase for %s: " pgg-gpg-user-id)
 186            (luna-send scheme 'lookup-key-string
 187                       scheme pgg-gpg-user-id 'encrypt)))
 188          (args '("--batch" "--decrypt")))
 189     (pgg-gpg-process-region start end passphrase pgg-gpg-program args)
 190     (pgg-process-when-success nil)
 191     ))
 192
 193 (luna-define-method sign-region ((scheme pgg-scheme-gpg)
 194                                  start end &optional cleartext)
 195   (let* ((pgg-gpg-user-id pgg-default-user-id)
 196          (passphrase
 197           (pgg-read-passphrase
 198            (format "GnuPG passphrase for %s: " pgg-gpg-user-id)
 199            (luna-send scheme 'lookup-key-string
 200                       scheme pgg-gpg-user-id 'sign)))
 201          (args
 202           (list (if cleartext "--clearsign" "--detach-sign")
 203                 "--armor" "--batch" "--verbose"
 204                 "--local-user" pgg-gpg-user-id))
 205          (inhibit-read-only t)
 206          buffer-read-only)
 207     (pgg-as-lbt start end 'CRLF
 208       (pgg-gpg-process-region start end passphrase pgg-gpg-program args)
 209       )
 210     (pgg-process-when-success
 211       (pgg-convert-lbt-region (point-min)(point-max) 'LF)
 212       (when (re-search-forward "^-+BEGIN PGP SIGNATURE" nil t);XXX
 213         (let ((packet
 214                (cdr (assq 2 (pgg-parse-armor-region
 215                              (progn (beginning-of-line 2)
 216                                     (point))
 217                              (point-max))))))
 218           (pgg-add-passphrase-cache
 219            (cdr (assq 'key-identifier packet))
 220            passphrase))))
 221     ))
 222
 223 (luna-define-method verify-region ((scheme pgg-scheme-gpg)
 224                                    start end &optional signature)
 225   (let ((args '("--batch" "--verify")))
 226     (when (stringp signature)
 227       (setq args (append args (list signature))))
 228     (pgg-gpg-process-region start end nil pgg-gpg-program args)
 229     (save-excursion
 230       (set-buffer pgg-errors-buffer)
 231       (goto-char (point-min))
 232       (while (re-search-forward "^gpg: " nil t)
 233         (replace-match ""))
 234       (goto-char (point-min))
 235       (let ((case-fold-search t))
 236         (while (re-search-forward "^warning: " nil t)
 237           (delete-region (match-beginning 0)
 238                          (progn (beginning-of-line 2) (point)))))
 239       (set-buffer pgg-status-buffer)
 240       (goto-char (point-min))
 241       (if (re-search-forward "^\\[GNUPG:] +GOODSIG +" nil t)
 242           (progn
 243             (set-buffer pgg-output-buffer)
 244             (insert-buffer-substring pgg-errors-buffer)
 245             t)
 246         nil))
 247     ))
 248
 249 (luna-define-method insert-key ((scheme pgg-scheme-gpg))
 250   (let* ((pgg-gpg-user-id pgg-default-user-id)
 251          (args (list "--batch" "--export" "--armor"
 252                      (concat "\"" pgg-gpg-user-id "\""))))
 253     (pgg-gpg-process-region (point)(point) nil pgg-gpg-program args)
 254     (insert-buffer-substring pgg-output-buffer)
 255     ))
 256
 257 (luna-define-method snarf-keys-region ((scheme pgg-scheme-gpg)
 258                                        start end)
 259   (let ((args '("--import" "--batch" "-")) status)
 260     (pgg-gpg-process-region start end nil pgg-gpg-program args)
 261     (set-buffer pgg-status-buffer)
 262     (goto-char (point-min))
 263     (when (re-search-forward "^\\[GNUPG:] +IMPORT_RES +" nil t)
 264       (setq status (buffer-substring (match-end 0)
 265                                      (progn (end-of-line)
 266                                             (point)))
 267             status (vconcat (mapcar #'string-to-int
 268                                     (split-string status))))
 269       (erase-buffer)
 270       (insert (format "Imported %d key(s).
 271 \tArmor contains %d key(s) [%d bad, %d old].\n"
 272                       (+ (aref status 2)
 273                          (aref status 10))
 274                       (aref status 0)
 275                       (aref status 1)
 276                       (+ (aref status 4)
 277                          (aref status 11)))
 278               (if (zerop (aref status 9))
 279                   ""
 280                 "\tSecret keys are imported.\n")))
 281     (append-to-buffer pgg-output-buffer
 282                       (point-min)(point-max))
 283     (pgg-process-when-success nil)
 284     ))
 285
 286 (provide 'pgg-gpg)
 287
 288 ;;; pgg-gpg.el ends here
 289