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1 ;;; tm-pgp.el --- tm-view internal methods for PGP.
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3 ;; Copyright (C) 1995,1996,1997 MORIOKA Tomohiko
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Created: 1995/12/7
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7 ;; Version: $Id: tm-pgp.el,v 1.3 1997/02/15 22:21:29 steve Exp $
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8 ;; Keywords: mail, news, MIME, multimedia, PGP, security
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9
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10 ;; This file is part of tm (Tools for MIME).
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11
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12 ;; This program is free software; you can redistribute it and/or
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13 ;; modify it under the terms of the GNU General Public License as
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14 ;; published by the Free Software Foundation; either version 2, or (at
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15 ;; your option) any later version.
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16
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17 ;; This program is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Commentary:
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28
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29 ;; This module is based on 2 drafts about PGP MIME integration:
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30
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31 ;; - RFC 2015: "MIME Security with Pretty Good Privacy (PGP)"
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32 ;; by Michael Elkins <elkins@aero.org> (1996/6)
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33 ;;
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34 ;; - draft-kazu-pgp-mime-00.txt: "PGP MIME Integration"
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35 ;; by Kazuhiko Yamamoto <kazu@is.aist-nara.ac.jp>
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36 ;; (1995/10; expired)
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37 ;;
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38 ;; These drafts may be contrary to each other. You should decide
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39 ;; which you support. (Maybe you should use PGP/MIME)
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40
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41 ;;; Code:
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42
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43 (require 'tm-play)
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44
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45
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46 ;;; @ internal method for application/pgp
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47 ;;;
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48 ;;; It is based on draft-kazu-pgp-mime-00.txt
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49
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50 (defun mime-article/view-application/pgp (beg end cal)
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51 (let* ((cnum (mime-article/point-content-number beg))
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52 (cur-buf (current-buffer))
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53 (p-win (or (get-buffer-window mime::article/preview-buffer)
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54 (get-largest-window)))
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55 (new-name (format "%s-%s" (buffer-name) cnum))
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56 (mother mime::article/preview-buffer)
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57 (mode major-mode)
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58 code-converter
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59 (str (buffer-substring beg end))
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60 )
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61 (set-buffer (get-buffer-create new-name))
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62 (erase-buffer)
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63 (insert str)
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64 (cond ((progn
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65 (goto-char (point-min))
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66 (re-search-forward "^-+BEGIN PGP SIGNED MESSAGE-+$" nil t)
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67 )
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68 (funcall (pgp-function 'verify))
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69 (goto-char (point-min))
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70 (delete-region
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71 (point-min)
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72 (and
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73 (re-search-forward "^-+BEGIN PGP SIGNED MESSAGE-+\n\n")
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74 (match-end 0))
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75 )
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76 (delete-region
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77 (and (re-search-forward "^-+BEGIN PGP SIGNATURE-+")
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78 (match-beginning 0))
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79 (point-max)
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80 )
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81 (goto-char (point-min))
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82 (while (re-search-forward "^- -" nil t)
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83 (replace-match "-")
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84 )
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85 (setq code-converter
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86 (or
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87 (cdr (assq mode mime-viewer/code-converter-alist))
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88 (function mime-viewer/default-code-convert-region)))
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89 )
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90 ((progn
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91 (goto-char (point-min))
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92 (re-search-forward "^-+BEGIN PGP MESSAGE-+$" nil t)
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93 )
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94 (as-binary-process (funcall (pgp-function 'decrypt)))
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95 (goto-char (point-min))
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96 (delete-region (point-min)
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97 (and
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98 (search-forward "\n\n")
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99 (match-end 0)))
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100 (setq code-converter (function mime-charset/decode-buffer))
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101 ))
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102 (setq major-mode 'mime/show-message-mode)
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103 (setq mime::article/code-converter code-converter)
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104 (save-window-excursion (mime/viewer-mode mother))
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105 (set-window-buffer p-win mime::article/preview-buffer)
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106 ))
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107
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108 (set-atype 'mime/content-decoding-condition
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109 '((type . "application/pgp")
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110 (method . mime-article/view-application/pgp)
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111 ))
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112
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113 (set-atype 'mime/content-decoding-condition
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114 '((type . "text/x-pgp")
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115 (method . mime-article/view-application/pgp)
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116 ))
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117
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118
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119 ;;; @ Internal method for application/pgp-signature
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120 ;;;
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121 ;;; It is based on RFC 2015.
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122
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123 (defvar tm-pgp::default-language 'en
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124 "*Symbol of language for pgp.
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125 It should be ISO 639 2 letter language code such as en, ja, ...")
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126
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127 (defvar tm-pgp::good-signature-regexp-alist
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128 '((en . "Good signature from user.*$"))
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129 "Alist of language vs regexp to detect ``Good signature''.")
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130
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131 (defvar tm-pgp::key-expected-regexp-alist
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132 '((en . "Key matching expected Key ID \\(\\S +\\) not found"))
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133 "Alist of language vs regexp to detect ``Key expected''.")
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134
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135 (defun mime::article/call-pgp-to-check-signature (output-buffer orig-file)
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136 (save-excursion
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137 (set-buffer output-buffer)
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138 (erase-buffer)
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139 )
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140 (let* ((lang (or tm-pgp::default-language 'en))
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141 (status
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142 (call-process-region (point-min)(point-max)
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143 "pgp" nil output-buffer nil orig-file
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144 (format "+language=%s" lang)
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145 ))
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146 (regexp (cdr (assq lang tm-pgp::good-signature-regexp-alist)))
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147 )
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148 (if (= status 0)
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149 (save-excursion
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150 (set-buffer output-buffer)
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151 (goto-char (point-min))
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152 (message
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153 (cond ((not (stringp regexp))
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154 "Please specify right regexp for specified language")
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155 ((re-search-forward regexp nil t)
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156 (buffer-substring (match-beginning 0) (match-end 0))
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157 )
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158 (t
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159 "Bad signature"
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160 )))
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161 ))))
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162
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163 (defun mime-article/check-pgp-signature (beg end cal)
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164 (let* ((encoding (cdr (assq 'encoding cal)))
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165 (cnum (mime-article/point-content-number beg))
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166 (rcnum (reverse cnum))
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167 (rmcnum (cdr rcnum))
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168 (knum (car rcnum))
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169 (onum (if (> knum 0)
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170 (1- knum)
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171 (1+ knum)))
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172 (oinfo (mime-article/rcnum-to-cinfo (cons onum rmcnum)
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173 mime::article/content-info))
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174 status str kbuf
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175 (basename (expand-file-name "tm" mime/tmp-dir))
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176 (orig-file (make-temp-name basename))
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177 (sig-file (concat orig-file ".sig"))
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178 )
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179 (save-excursion
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180 (setq str (buffer-substring
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181 (mime::content-info/point-min oinfo)
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182 (mime::content-info/point-max oinfo)
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183 ))
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184 (set-buffer (get-buffer-create mime/temp-buffer-name))
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185 (insert str)
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186 (goto-char (point-min))
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187 (while (re-search-forward "\n" nil t)
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188 (replace-match "\r\n")
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189 )
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190 (as-binary-output-file (write-file orig-file))
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191 (kill-buffer (current-buffer))
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192 )
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193 (save-excursion
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194 (mime-article/show-output-buffer)
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195 )
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196 (save-excursion
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197 (setq str (buffer-substring
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198 (save-excursion
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199 (goto-char beg)
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200 (and (search-forward "\n\n")
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201 (match-end 0)))
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202 end))
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203 (set-buffer (setq kbuf (get-buffer-create mime/temp-buffer-name)))
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204 (insert str)
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205 (mime-decode-region (point-min)(point-max) encoding)
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206 (as-binary-output-file (write-file sig-file))
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207 (or (mime::article/call-pgp-to-check-signature
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208 mime/output-buffer-name orig-file)
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209 (let (pgp-id)
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210 (save-excursion
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211 (set-buffer mime/output-buffer-name)
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212 (goto-char (point-min))
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213 (let ((regexp (cdr (assq (or tm-pgp::default-language 'en)
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214 tm-pgp::key-expected-regexp-alist))))
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215 (cond ((not (stringp regexp))
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216 (message
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217 "Please specify right regexp for specified language")
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218 )
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219 ((re-search-forward regexp nil t)
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220 (setq pgp-id
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221 (concat "0x" (buffer-substring-no-properties
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222 (match-beginning 1)
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223 (match-end 1))))
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224 ))))
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225 (if (and pgp-id
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226 (y-or-n-p
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227 (format "Key %s not found; attempt to fetch? " pgp-id))
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228 )
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229 (progn
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230 (funcall (pgp-function 'fetch-key) (cons nil pgp-id))
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231 (mime::article/call-pgp-to-check-signature
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232 mime/output-buffer-name orig-file)
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233 ))
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234 ))
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235 (let ((other-window-scroll-buffer mime/output-buffer-name))
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236 (scroll-other-window 8)
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237 )
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238 (kill-buffer kbuf)
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239 (delete-file orig-file)
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240 (delete-file sig-file)
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241 )))
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242
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243 (set-atype 'mime/content-decoding-condition
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244 '((type . "application/pgp-signature")
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245 (method . mime-article/check-pgp-signature)
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246 ))
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247
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248
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249 ;;; @ Internal method for application/pgp-encrypted
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250 ;;;
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251 ;;; It is based on RFC 2015.
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252
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253 (defun mime-article/decrypt-pgp (beg end cal)
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254 (let* ((cnum (mime-article/point-content-number beg))
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255 (rcnum (reverse cnum))
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256 (rmcnum (cdr rcnum))
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257 (knum (car rcnum))
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258 (onum (if (> knum 0)
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259 (1- knum)
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260 (1+ knum)))
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261 (oinfo (mime-article/rcnum-to-cinfo (cons onum rmcnum)
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262 mime::article/content-info))
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263 (obeg (mime::content-info/point-min oinfo))
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264 (oend (mime::content-info/point-max oinfo))
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265 )
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266 (mime-article/view-application/pgp obeg oend cal)
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267 ))
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268
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269 (set-atype 'mime/content-decoding-condition
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270 '((type . "application/pgp-encrypted")
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271 (method . mime-article/decrypt-pgp)
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272 ))
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273
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274
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275 ;;; @ Internal method for application/pgp-keys
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276 ;;;
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277 ;;; It is based on RFC 2015.
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278
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279 (defun mime-article/add-pgp-keys (beg end cal)
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280 (let* ((cnum (mime-article/point-content-number beg))
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281 (cur-buf (current-buffer))
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282 (new-name (format "%s-%s" (buffer-name) cnum))
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283 (mother mime::article/preview-buffer)
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284 (charset (cdr (assoc "charset" cal)))
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285 (encoding (cdr (assq 'encoding cal)))
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286 (mode major-mode)
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287 str)
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288 (setq str (buffer-substring beg end))
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289 (switch-to-buffer new-name)
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290 (setq buffer-read-only nil)
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291 (erase-buffer)
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292 (insert str)
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293 (goto-char (point-min))
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294 (if (re-search-forward "^\n" nil t)
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295 (delete-region (point-min) (match-end 0))
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296 )
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297 (mime-decode-region (point-min)(point-max) encoding)
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298 (funcall (pgp-function 'snarf-keys))
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299 (kill-buffer (current-buffer))
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300 ))
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301
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302 (set-atype 'mime/content-decoding-condition
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303 '((type . "application/pgp-keys")
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304 (method . mime-article/add-pgp-keys)
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305 ))
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306
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307
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308 ;;; @ end
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309 ;;;
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310
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311 (provide 'tm-pgp)
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312
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313 (run-hooks 'tm-pgp-load-hook)
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314
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315 ;;; tm-pgp.el ends here
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