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;;; pgg-gpg.el --- GnuPG support for PGG.
;; Copyright (C) 1999,2000 Free Software Foundation, Inc.
;; Author: Daiki Ueno <ueno@unixuser.org>
;; Created: 1999/10/28
;; Keywords: PGP, OpenPGP, GnuPG
;; This file is part of SEMI (Secure Emacs MIME Interface).
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2, or (at
;; your option) any later version.
;; This program is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Code:
(require 'mel) ; binary-to-text-funcall
(eval-when-compile (require 'pgg))
(defgroup pgg-gpg ()
"GnuPG interface"
:group 'pgg)
(defcustom pgg-gpg-program "gpg"
"The GnuPG executable."
:group 'pgg-gpg
:type 'string)
(defcustom pgg-gpg-extra-args nil
"Extra arguments for every GnuPG invocation."
:group 'pgg-gpg
:type 'string)
(eval-and-compile
(luna-define-class pgg-scheme-gpg (pgg-scheme)))
(defvar pgg-gpg-user-id nil
"GnuPG ID of your default identity.")
(defvar pgg-gpg-messages-coding-system pgg-messages-coding-system
"Coding system used when reading from a GnuPG external process.")
(defvar pgg-gpg-messages-locale pgg-messages-locale
"Locale set before running a GnuPG external process.")
(defvar pgg-scheme-gpg-instance nil)
;;;###autoload
(defun pgg-make-scheme-gpg ()
(or pgg-scheme-gpg-instance
(setq pgg-scheme-gpg-instance
(luna-make-entity 'pgg-scheme-gpg))))
(defun pgg-gpg-process-region (start end passphrase program args)
(let* ((output-file-name (make-temp-file
(expand-file-name "pgg-output"
temporary-file-directory)))
(args
`("--status-fd" "2"
,@(if passphrase '("--passphrase-fd" "0"))
"--yes" ; overwrite
"--output" ,output-file-name
,@pgg-gpg-extra-args ,@args))
(output-buffer pgg-output-buffer)
(errors-buffer pgg-errors-buffer)
(process-connection-type nil)
(process-environment process-environment)
process status exit-status)
(when pgg-gpg-messages-locale
(setq process-environment (copy-sequence process-environment))
(setenv "LC_ALL" pgg-gpg-messages-locale)
(setenv "LANGUAGE" pgg-gpg-messages-locale))
(with-current-buffer (get-buffer-create errors-buffer)
(buffer-disable-undo)
(erase-buffer))
(unwind-protect
(progn
(setq process
(apply #'binary-to-text-funcall
pgg-gpg-messages-coding-system
#'start-process "*GnuPG*" errors-buffer
program args))
(set-process-sentinel process #'ignore)
(when passphrase
(process-send-string process (concat passphrase "\n")))
(process-send-region process start end)
(process-send-eof process)
(while (eq 'run (process-status process))
(accept-process-output process 5))
(setq status (process-status process)
exit-status (process-exit-status process))
(delete-process process)
(with-current-buffer (get-buffer-create output-buffer)
(buffer-disable-undo)
(erase-buffer)
(if (file-exists-p output-file-name)
(let ((coding-system-for-read 'raw-text-dos))
(insert-file-contents output-file-name)))
(set-buffer errors-buffer)
(if (memq status '(stop signal))
(error "%s exited abnormally: '%s'" program exit-status))
(if (= 127 exit-status)
(error "%s could not be found" program))))
(if (and process (eq 'run (process-status process)))
(interrupt-process process))
(if (file-exists-p output-file-name)
(delete-file output-file-name)))))
(defun pgg-gpg-possibly-cache-passphrase (passphrase)
(if (and pgg-cache-passphrase
(progn
(goto-char (point-min))
(re-search-forward "^\\[GNUPG:] GOOD_PASSPHRASE\\>" nil t)))
(pgg-add-passphrase-cache
(progn
(goto-char (point-min))
(if (re-search-forward
"^\\[GNUPG:] NEED_PASSPHRASE \\w+ ?\\w*" nil t)
(substring (match-string 0) -8)))
passphrase)))
(luna-define-method pgg-scheme-lookup-key ((scheme pgg-scheme-gpg)
string &optional type)
(let ((args (list "--with-colons" "--no-greeting" "--batch"
(if type "--list-secret-keys" "--list-keys")
string)))
(with-temp-buffer
(apply #'call-process pgg-gpg-program nil t nil args)
(goto-char (point-min))
(if (re-search-forward "^\\(sec\\|pub\\):[^:]*:[^:]*:[^:]*:\\([^:]*\\)"
nil t)
(substring (match-string 2) 8)))))
(luna-define-method pgg-scheme-encrypt-region ((scheme pgg-scheme-gpg)
start end recipients)
(let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
(args
`("--batch" "--armor" "--always-trust" "--encrypt"
,@(if recipients
(apply #'nconc
(mapcar (lambda (rcpt)
(list "--remote-user" rcpt))
(append recipients
(if pgg-encrypt-for-me
(list pgg-gpg-user-id)))))))))
(pgg-as-lbt start end 'CRLF
(pgg-gpg-process-region start end nil pgg-gpg-program args))
(pgg-process-when-success)))
(luna-define-method pgg-scheme-decrypt-region ((scheme pgg-scheme-gpg)
start end)
(let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
(passphrase
(pgg-read-passphrase
(format "GnuPG passphrase for %s: " pgg-gpg-user-id)
(pgg-scheme-lookup-key scheme pgg-gpg-user-id 'encrypt)))
(args '("--batch" "--decrypt")))
(pgg-gpg-process-region start end passphrase pgg-gpg-program args)
(with-current-buffer pgg-errors-buffer
(pgg-gpg-possibly-cache-passphrase passphrase)
(goto-char (point-min))
(re-search-forward "^\\[GNUPG:] DECRYPTION_OKAY\\>" nil t))))
(luna-define-method pgg-scheme-sign-region ((scheme pgg-scheme-gpg)
start end &optional cleartext)
(let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
(passphrase
(pgg-read-passphrase
(format "GnuPG passphrase for %s: " pgg-gpg-user-id)
(pgg-scheme-lookup-key scheme pgg-gpg-user-id 'sign)))
(args
(list (if cleartext "--clearsign" "--detach-sign")
"--armor" "--batch" "--verbose"
"--local-user" pgg-gpg-user-id))
(inhibit-read-only t)
buffer-read-only)
(pgg-as-lbt start end 'CRLF
(pgg-gpg-process-region start end passphrase pgg-gpg-program args))
(with-current-buffer pgg-errors-buffer
(pgg-gpg-possibly-cache-passphrase passphrase))
(pgg-process-when-success)))
(luna-define-method pgg-scheme-verify-region ((scheme pgg-scheme-gpg)
start end &optional signature)
(let ((args '("--batch" "--verify")))
(when (stringp signature)
(setq args (append args (list signature))))
(setq args (append args '("-")))
(pgg-gpg-process-region start end nil pgg-gpg-program args)
(with-current-buffer pgg-errors-buffer
(goto-char (point-min))
(while (re-search-forward "^gpg: " nil t)
(replace-match ""))
(goto-char (point-min))
(prog1 (re-search-forward "^\\[GNUPG:] GOODSIG\\>" nil t)
(goto-char (point-min))
(delete-matching-lines "^\\[GNUPG:] ")
;; XXX: copy contents of pgg-errors-buffer into
;; pgg-output-buffer for backward compatibility.
(with-current-buffer pgg-output-buffer
(set-buffer-multibyte t)
(insert-buffer-substring pgg-errors-buffer))))))
(luna-define-method pgg-scheme-insert-key ((scheme pgg-scheme-gpg))
(let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
(args (list "--batch" "--export" "--armor"
pgg-gpg-user-id)))
(pgg-gpg-process-region (point)(point) nil pgg-gpg-program args)
(insert-buffer-substring pgg-output-buffer)))
(luna-define-method pgg-scheme-snarf-keys-region ((scheme pgg-scheme-gpg)
start end)
(let ((args '("--import" "--batch" "-")) status)
(pgg-gpg-process-region start end nil pgg-gpg-program args)
(set-buffer pgg-errors-buffer)
(goto-char (point-min))
(when (re-search-forward "^\\[GNUPG:] IMPORT_RES\\>" nil t)
(setq status (buffer-substring (match-end 0)
(progn (end-of-line)(point)))
status (vconcat (mapcar #'string-to-int (split-string status))))
(erase-buffer)
(insert (format "Imported %d key(s).
\tArmor contains %d key(s) [%d bad, %d old].\n"
(+ (aref status 2)
(aref status 10))
(aref status 0)
(aref status 1)
(+ (aref status 4)
(aref status 11)))
(if (zerop (aref status 9))
""
"\tSecret keys are imported.\n"))
;; XXX: copy contents of pgg-errors-buffer into
;; pgg-output-buffer for backward compatibility.
(with-current-buffer pgg-output-buffer
(set-buffer-multibyte t)
(insert-buffer-substring pgg-errors-buffer))
t)))
(provide 'pgg-gpg)
;;; pgg-gpg.el ends here
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