From 213eb88df7a48d406d3c9aea4f00d656df95fe03 Mon Sep 17 00:00:00 2001 From: tmorioka Date: Thu, 27 Feb 1997 08:09:32 +0000 Subject: [PATCH] *** empty log message *** --- mime-pgp.el | 315 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 315 insertions(+) create mode 100644 mime-pgp.el diff --git a/mime-pgp.el b/mime-pgp.el new file mode 100644 index 0000000..cef68e1 --- /dev/null +++ b/mime-pgp.el @@ -0,0 +1,315 @@ +;;; mime-pgp.el --- mime-view internal methods for PGP. + +;; Copyright (C) 1995,1996,1997 MORIOKA Tomohiko + +;; Author: MORIOKA Tomohiko +;; Created: 1995/12/7 +;; Version: $Id: mime-pgp.el,v 0.0 1997-02-27 08:09:32 tmorioka Exp $ +;; Keywords: mail, news, MIME, multimedia, PGP, security + +;; This file is part of SEMI (SEMI is Emacs MIME Interfaces). + +;; 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., 59 Temple Place - Suite 330, +;; Boston, MA 02111-1307, USA. + +;;; Commentary: + +;; This module is based on 2 drafts about PGP MIME integration: + +;; - RFC 2015: "MIME Security with Pretty Good Privacy (PGP)" +;; by Michael Elkins (1996/6) +;; +;; - draft-kazu-pgp-mime-00.txt: "PGP MIME Integration" +;; by Kazuhiko Yamamoto +;; (1995/10; expired) +;; +;; These drafts may be contrary to each other. You should decide +;; which you support. (Maybe you should use PGP/MIME) + +;;; Code: + +(require 'mime-play) + + +;;; @ internal method for application/pgp +;;; +;;; It is based on draft-kazu-pgp-mime-00.txt + +(defun mime-article/view-application/pgp (beg end cal) + (let* ((cnum (mime-article/point-content-number beg)) + (cur-buf (current-buffer)) + (p-win (or (get-buffer-window mime::article/preview-buffer) + (get-largest-window))) + (new-name (format "%s-%s" (buffer-name) cnum)) + (mother mime::article/preview-buffer) + (mode major-mode) + code-converter + (str (buffer-substring beg end)) + ) + (set-buffer (get-buffer-create new-name)) + (erase-buffer) + (insert str) + (cond ((progn + (goto-char (point-min)) + (re-search-forward "^-+BEGIN PGP SIGNED MESSAGE-+$" nil t) + ) + (funcall (pgp-function 'verify)) + (goto-char (point-min)) + (delete-region + (point-min) + (and + (re-search-forward "^-+BEGIN PGP SIGNED MESSAGE-+\n\n") + (match-end 0)) + ) + (delete-region + (and (re-search-forward "^-+BEGIN PGP SIGNATURE-+") + (match-beginning 0)) + (point-max) + ) + (goto-char (point-min)) + (while (re-search-forward "^- -" nil t) + (replace-match "-") + ) + (setq code-converter + (or + (cdr (assq mode mime-viewer/code-converter-alist)) + (function mime-viewer/default-code-convert-region))) + ) + ((progn + (goto-char (point-min)) + (re-search-forward "^-+BEGIN PGP MESSAGE-+$" nil t) + ) + (as-binary-process (funcall (pgp-function 'decrypt))) + (goto-char (point-min)) + (delete-region (point-min) + (and + (search-forward "\n\n") + (match-end 0))) + (setq code-converter (function mime-charset/decode-buffer)) + )) + (setq major-mode 'mime/show-message-mode) + (setq mime::article/code-converter code-converter) + (save-window-excursion (mime/viewer-mode mother)) + (set-window-buffer p-win mime::article/preview-buffer) + )) + +(set-atype 'mime/content-decoding-condition + '((type . "application/pgp") + (method . mime-article/view-application/pgp) + )) + +(set-atype 'mime/content-decoding-condition + '((type . "text/x-pgp") + (method . mime-article/view-application/pgp) + )) + + +;;; @ Internal method for application/pgp-signature +;;; +;;; It is based on RFC 2015. + +(defvar mime-pgp-default-language 'en + "*Symbol of language for pgp. +It should be ISO 639 2 letter language code such as en, ja, ...") + +(defvar mime-pgp-good-signature-regexp-alist + '((en . "Good signature from user.*$")) + "Alist of language vs regexp to detect ``Good signature''.") + +(defvar mime-pgp-key-expected-regexp-alist + '((en . "Key matching expected Key ID \\(\\S +\\) not found")) + "Alist of language vs regexp to detect ``Key expected''.") + +(defun mime::article/call-pgp-to-check-signature (output-buffer orig-file) + (save-excursion + (set-buffer output-buffer) + (erase-buffer) + ) + (let* ((lang (or mime-pgp-default-language 'en)) + (status + (call-process-region (point-min)(point-max) + "pgp" nil output-buffer nil orig-file + (format "+language=%s" lang) + )) + (regexp (cdr (assq lang mime-pgp-good-signature-regexp-alist))) + ) + (if (= status 0) + (save-excursion + (set-buffer output-buffer) + (goto-char (point-min)) + (message + (cond ((not (stringp regexp)) + "Please specify right regexp for specified language") + ((re-search-forward regexp nil t) + (buffer-substring (match-beginning 0) (match-end 0)) + ) + (t + "Bad signature" + ))) + )))) + +(defun mime-article/check-pgp-signature (beg end cal) + (let* ((encoding (cdr (assq 'encoding cal))) + (cnum (mime-article/point-content-number beg)) + (rcnum (reverse cnum)) + (rmcnum (cdr rcnum)) + (knum (car rcnum)) + (onum (if (> knum 0) + (1- knum) + (1+ knum))) + (oinfo (mime-article/rcnum-to-cinfo (cons onum rmcnum) + mime::article/content-info)) + status str kbuf + (basename (expand-file-name "tm" mime/tmp-dir)) + (orig-file (make-temp-name basename)) + (sig-file (concat orig-file ".sig")) + ) + (save-excursion + (setq str (buffer-substring + (mime::content-info/point-min oinfo) + (mime::content-info/point-max oinfo) + )) + (set-buffer (get-buffer-create mime/temp-buffer-name)) + (insert str) + (goto-char (point-min)) + (while (re-search-forward "\n" nil t) + (replace-match "\r\n") + ) + (as-binary-output-file (write-file orig-file)) + (kill-buffer (current-buffer)) + ) + (save-excursion + (mime-article/show-output-buffer) + ) + (save-excursion + (setq str (buffer-substring + (save-excursion + (goto-char beg) + (and (search-forward "\n\n") + (match-end 0))) + end)) + (set-buffer (setq kbuf (get-buffer-create mime/temp-buffer-name))) + (insert str) + (mime-decode-region (point-min)(point-max) encoding) + (as-binary-output-file (write-file sig-file)) + (or (mime::article/call-pgp-to-check-signature + mime/output-buffer-name orig-file) + (let (pgp-id) + (save-excursion + (set-buffer mime/output-buffer-name) + (goto-char (point-min)) + (let ((regexp (cdr (assq (or mime-pgp-default-language 'en) + mime-pgp-key-expected-regexp-alist)))) + (cond ((not (stringp regexp)) + (message + "Please specify right regexp for specified language") + ) + ((re-search-forward regexp nil t) + (setq pgp-id + (concat "0x" (buffer-substring-no-properties + (match-beginning 1) + (match-end 1)))) + )))) + (if (and pgp-id + (y-or-n-p + (format "Key %s not found; attempt to fetch? " pgp-id)) + ) + (progn + (funcall (pgp-function 'fetch-key) (cons nil pgp-id)) + (mime::article/call-pgp-to-check-signature + mime/output-buffer-name orig-file) + )) + )) + (let ((other-window-scroll-buffer mime/output-buffer-name)) + (scroll-other-window 8) + ) + (kill-buffer kbuf) + (delete-file orig-file) + (delete-file sig-file) + ))) + +(set-atype 'mime/content-decoding-condition + '((type . "application/pgp-signature") + (method . mime-article/check-pgp-signature) + )) + + +;;; @ Internal method for application/pgp-encrypted +;;; +;;; It is based on RFC 2015. + +(defun mime-article/decrypt-pgp (beg end cal) + (let* ((cnum (mime-article/point-content-number beg)) + (rcnum (reverse cnum)) + (rmcnum (cdr rcnum)) + (knum (car rcnum)) + (onum (if (> knum 0) + (1- knum) + (1+ knum))) + (oinfo (mime-article/rcnum-to-cinfo (cons onum rmcnum) + mime::article/content-info)) + (obeg (mime::content-info/point-min oinfo)) + (oend (mime::content-info/point-max oinfo)) + ) + (mime-article/view-application/pgp obeg oend cal) + )) + +(set-atype 'mime/content-decoding-condition + '((type . "application/pgp-encrypted") + (method . mime-article/decrypt-pgp) + )) + + +;;; @ Internal method for application/pgp-keys +;;; +;;; It is based on RFC 2015. + +(defun mime-article/add-pgp-keys (beg end cal) + (let* ((cnum (mime-article/point-content-number beg)) + (cur-buf (current-buffer)) + (new-name (format "%s-%s" (buffer-name) cnum)) + (mother mime::article/preview-buffer) + (charset (cdr (assoc "charset" cal))) + (encoding (cdr (assq 'encoding cal))) + (mode major-mode) + str) + (setq str (buffer-substring beg end)) + (switch-to-buffer new-name) + (setq buffer-read-only nil) + (erase-buffer) + (insert str) + (goto-char (point-min)) + (if (re-search-forward "^\n" nil t) + (delete-region (point-min) (match-end 0)) + ) + (mime-decode-region (point-min)(point-max) encoding) + (funcall (pgp-function 'snarf-keys)) + (kill-buffer (current-buffer)) + )) + +(set-atype 'mime/content-decoding-condition + '((type . "application/pgp-keys") + (method . mime-article/add-pgp-keys) + )) + + +;;; @ end +;;; + +(provide 'mime-pgp) + +(run-hooks 'mime-pgp-load-hook) + +;;; mime-pgp.el ends here -- 1.7.10.4