257 lines
8.9 KiB
EmacsLisp
257 lines
8.9 KiB
EmacsLisp
;;; pgg-gpg.el --- GnuPG support for PGG.
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;; Copyright (C) 1999,2000 Free Software Foundation, Inc.
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;; Author: Daiki Ueno <ueno@unixuser.org>
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;; Created: 1999/10/28
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;; Keywords: PGP, OpenPGP, GnuPG
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;; This file is part of SEMI (Secure Emacs MIME Interface).
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;; This program is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation; either version 2, or (at
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;; your option) any later version.
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;; This program is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Code:
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(require 'mel) ; binary-to-text-funcall
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(eval-when-compile (require 'pgg))
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(defgroup pgg-gpg ()
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"GnuPG interface"
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:group 'pgg)
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(defcustom pgg-gpg-program "gpg"
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"The GnuPG executable."
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:group 'pgg-gpg
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:type 'string)
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(defcustom pgg-gpg-extra-args nil
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"Extra arguments for every GnuPG invocation."
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:group 'pgg-gpg
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:type 'string)
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(eval-and-compile
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(luna-define-class pgg-scheme-gpg (pgg-scheme)))
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(defvar pgg-gpg-user-id nil
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"GnuPG ID of your default identity.")
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(defvar pgg-gpg-messages-coding-system pgg-messages-coding-system
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"Coding system used when reading from a GnuPG external process.")
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(defvar pgg-gpg-messages-locale pgg-messages-locale
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"Locale set before running a GnuPG external process.")
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(defvar pgg-scheme-gpg-instance nil)
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;;;###autoload
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(defun pgg-make-scheme-gpg ()
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(or pgg-scheme-gpg-instance
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(setq pgg-scheme-gpg-instance
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(luna-make-entity 'pgg-scheme-gpg))))
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(defun pgg-gpg-process-region (start end passphrase program args)
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(let* ((output-file-name (make-temp-file
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(expand-file-name "pgg-output"
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temporary-file-directory)))
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(args
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`("--status-fd" "2"
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,@(if passphrase '("--passphrase-fd" "0"))
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"--yes" ; overwrite
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"--output" ,output-file-name
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,@pgg-gpg-extra-args ,@args))
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(output-buffer pgg-output-buffer)
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(errors-buffer pgg-errors-buffer)
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(process-connection-type nil)
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(process-environment process-environment)
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process status exit-status)
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(when pgg-gpg-messages-locale
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(setq process-environment (copy-sequence process-environment))
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(setenv "LC_ALL" pgg-gpg-messages-locale)
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(setenv "LANGUAGE" pgg-gpg-messages-locale))
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(with-current-buffer (get-buffer-create errors-buffer)
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(buffer-disable-undo)
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(erase-buffer))
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(unwind-protect
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(progn
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(setq process
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(apply #'binary-to-text-funcall
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pgg-gpg-messages-coding-system
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#'start-process "*GnuPG*" errors-buffer
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program args))
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(set-process-sentinel process #'ignore)
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(when passphrase
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(process-send-string process (concat passphrase "\n")))
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(process-send-region process start end)
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(process-send-eof process)
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(while (eq 'run (process-status process))
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(accept-process-output process 5))
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(setq status (process-status process)
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exit-status (process-exit-status process))
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(delete-process process)
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(with-current-buffer (get-buffer-create output-buffer)
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(buffer-disable-undo)
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(erase-buffer)
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(if (file-exists-p output-file-name)
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(let ((coding-system-for-read 'raw-text-dos))
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(insert-file-contents output-file-name)))
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(set-buffer errors-buffer)
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(if (memq status '(stop signal))
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(error "%s exited abnormally: '%s'" program exit-status))
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(if (= 127 exit-status)
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(error "%s could not be found" program))))
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(if (and process (eq 'run (process-status process)))
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(interrupt-process process))
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(if (file-exists-p output-file-name)
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(delete-file output-file-name)))))
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(defun pgg-gpg-possibly-cache-passphrase (passphrase)
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(if (and pgg-cache-passphrase
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(progn
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(goto-char (point-min))
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(re-search-forward "^\\[GNUPG:] GOOD_PASSPHRASE\\>" nil t)))
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(pgg-add-passphrase-cache
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(progn
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(goto-char (point-min))
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(if (re-search-forward
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"^\\[GNUPG:] NEED_PASSPHRASE \\w+ ?\\w*" nil t)
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(substring (match-string 0) -8)))
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passphrase)))
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(luna-define-method pgg-scheme-lookup-key ((scheme pgg-scheme-gpg)
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string &optional type)
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(let ((args (list "--with-colons" "--no-greeting" "--batch"
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(if type "--list-secret-keys" "--list-keys")
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string)))
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(with-temp-buffer
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(apply #'call-process pgg-gpg-program nil t nil args)
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(goto-char (point-min))
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(if (re-search-forward "^\\(sec\\|pub\\):" nil t)
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(substring
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(nth 3 (split-string
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(buffer-substring (match-end 0)
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(progn (end-of-line)(point)))
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":")) 8)))))
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(luna-define-method pgg-scheme-encrypt-region ((scheme pgg-scheme-gpg)
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start end recipients)
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(let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
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(args
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`("--batch" "--armor" "--always-trust" "--encrypt"
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,@(if recipients
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(apply #'nconc
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(mapcar (lambda (rcpt)
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(list "--remote-user" rcpt))
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(append recipients
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(if pgg-encrypt-for-me
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(list pgg-gpg-user-id)))))))))
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(pgg-as-lbt start end 'CRLF
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(pgg-gpg-process-region start end nil pgg-gpg-program args))
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(pgg-process-when-success)))
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(luna-define-method pgg-scheme-decrypt-region ((scheme pgg-scheme-gpg)
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start end)
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(let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
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(passphrase
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(pgg-read-passphrase
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(format "GnuPG passphrase for %s: " pgg-gpg-user-id)
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(pgg-scheme-lookup-key scheme pgg-gpg-user-id 'encrypt)))
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(args '("--batch" "--decrypt")))
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(pgg-gpg-process-region start end passphrase pgg-gpg-program args)
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(with-current-buffer pgg-errors-buffer
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(pgg-gpg-possibly-cache-passphrase passphrase)
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(goto-char (point-min))
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(re-search-forward "^\\[GNUPG:] DECRYPTION_OKAY\\>" nil t))))
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(luna-define-method pgg-scheme-sign-region ((scheme pgg-scheme-gpg)
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start end &optional cleartext)
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(let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
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(passphrase
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(pgg-read-passphrase
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(format "GnuPG passphrase for %s: " pgg-gpg-user-id)
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(pgg-scheme-lookup-key scheme pgg-gpg-user-id 'sign)))
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(args
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(list (if cleartext "--clearsign" "--detach-sign")
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"--armor" "--batch" "--verbose"
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"--local-user" pgg-gpg-user-id))
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(inhibit-read-only t)
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buffer-read-only)
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(pgg-as-lbt start end 'CRLF
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(pgg-gpg-process-region start end passphrase pgg-gpg-program args))
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(with-current-buffer pgg-errors-buffer
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(pgg-gpg-possibly-cache-passphrase passphrase))
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(pgg-process-when-success)))
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(luna-define-method pgg-scheme-verify-region ((scheme pgg-scheme-gpg)
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start end &optional signature)
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(let ((args '("--batch" "--verify")))
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(when (stringp signature)
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(setq args (append args (list signature))))
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(setq args (append args '("-")))
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(pgg-gpg-process-region start end nil pgg-gpg-program args)
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(with-current-buffer pgg-errors-buffer
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(goto-char (point-min))
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(while (re-search-forward "^gpg: " nil t)
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(replace-match ""))
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(goto-char (point-min))
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(prog1 (re-search-forward "^\\[GNUPG:] GOODSIG\\>" nil t)
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(goto-char (point-min))
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(delete-matching-lines "^\\[GNUPG:] ")
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;; XXX: copy contents of pgg-errors-buffer into
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;; pgg-output-buffer for backward compatibility.
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(with-current-buffer pgg-output-buffer
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(set-buffer-multibyte t)
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(insert-buffer-substring pgg-errors-buffer))))))
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(luna-define-method pgg-scheme-insert-key ((scheme pgg-scheme-gpg))
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(let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
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(args (list "--batch" "--export" "--armor"
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pgg-gpg-user-id)))
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(pgg-gpg-process-region (point)(point) nil pgg-gpg-program args)
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(insert-buffer-substring pgg-output-buffer)))
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(luna-define-method pgg-scheme-snarf-keys-region ((scheme pgg-scheme-gpg)
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start end)
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(let ((args '("--import" "--batch" "-")) status)
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(pgg-gpg-process-region start end nil pgg-gpg-program args)
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(set-buffer pgg-errors-buffer)
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(goto-char (point-min))
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(when (re-search-forward "^\\[GNUPG:] IMPORT_RES\\>" nil t)
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(setq status (buffer-substring (match-end 0)
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(progn (end-of-line)(point)))
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status (vconcat (mapcar #'string-to-int (split-string status))))
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(erase-buffer)
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(insert (format "Imported %d key(s).
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\tArmor contains %d key(s) [%d bad, %d old].\n"
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(+ (aref status 2)
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(aref status 10))
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(aref status 0)
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(aref status 1)
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(+ (aref status 4)
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(aref status 11)))
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(if (zerop (aref status 9))
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""
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"\tSecret keys are imported.\n"))
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;; XXX: copy contents of pgg-errors-buffer into
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;; pgg-output-buffer for backward compatibility.
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(with-current-buffer pgg-output-buffer
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(set-buffer-multibyte t)
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(insert-buffer-substring pgg-errors-buffer))
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t)))
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(provide 'pgg-gpg)
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;;; pgg-gpg.el ends here
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