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1 ;; mc-remail.el --- Remailer support for Mailcrypt
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2
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3 ;; Copyright (C) 1995 Patrick LoPresti <patl@lcs.mit.edu>
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4
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5 ;;{{{ Licensing
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6
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7 ;; This file is intended to be used with GNU Emacs.
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8
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9 ;; This program is free software; you can redistribute it and/or modify
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10 ;; it under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; This program is distributed in the hope that it will be useful,
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15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 ;; GNU General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with GNU Emacs; see the file COPYING. If not, write to
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21 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ;;}}}
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24 ;;{{{ Load required packages
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25
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26 (require 'mail-utils)
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27 (require 'sendmail)
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28 (require 'mailcrypt)
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29
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30 (eval-and-compile
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31 (if (not mc-xemacs-p)
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32 (progn
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33 (autoload 'mc-cleanup-recipient-headers "mc-toplev")
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34 (autoload 'mc-encrypt-message "mc-toplev"))))
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35
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36 (eval-and-compile
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37 (condition-case nil (require 'mailalias) (error nil)))
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38
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39 ;;}}}
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40 ;;{{{ Functions dealing with remailer structures
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41
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42 (defsubst mc-remailer-create (addr id props pre-encr post-encr)
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43 "Create a remailer structure.
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44
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45 ADDR is the remailer's Email address, a string.
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46
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47 ID is the remailer's public key ID (a string) or nil if the same as
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48 ADDR.
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49
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50 PROPS is a list of properties, as strings.
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51
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52 PRE-ENCR is a list of pre-encryption functions. Its elements will be
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53 called with the remailer structure itself as argument.
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54
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55 POST-ENCR is similar, but for post-encryption functions."
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56 (list 'remailer addr id props pre-encr post-encr))
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57
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58 (defsubst mc-remailerp (remailer)
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59 "Test whether REMAILER is a valid remailer struct."
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60 (and (listp remailer) (eq 'remailer (car-safe remailer))))
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61
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62 (defsubst mc-remailer-address (remailer)
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63 "Return the Email address of REMAILER."
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64 (nth 1 remailer))
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65
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66 (defsubst mc-remailer-userid (remailer)
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67 "Return the userid with which to look up the public key for REMAILER."
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68 (or (nth 2 remailer)
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69 (mc-strip-address (mc-remailer-address remailer))))
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70
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71 (defsubst mc-remailer-properties (remailer)
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72 "Return the property list for REMAILER"
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73 (nth 3 remailer))
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74
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75 (defsubst mc-remailer-pre-encrypt-hooks (remailer)
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76 "Return the list of pre-encryption hooks for REMAILER."
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77 (nth 4 remailer))
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78
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79 (defsubst mc-remailer-post-encrypt-hooks (remailer)
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80 "Return the list of post-encryption hooks for REMAILER."
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81 (nth 5 remailer))
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82
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83 (defun mc-remailer-remove-property (remailer prop)
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84 (let ((props (append (mc-remailer-properties remailer) nil)))
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85 (setq props (delete prop props))
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86 (mc-remailer-create
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87 (mc-remailer-address remailer)
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88 (mc-remailer-userid remailer)
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89 props
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90 (mc-remailer-pre-encrypt-hooks remailer)
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91 (mc-remailer-post-encrypt-hooks remailer))))
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92
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93 ;;}}}
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94 ;;{{{ User variables
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95
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96 (defvar mc-response-block-included-headers
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97 '("From" "To" "Newsgroups")
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98 "List of header fields to include in response blocks.
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99
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100 These will be copied into the deepest layer of the response block to
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101 help you identify it when it is used to Email you.")
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102
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103
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104 (defvar mc-remailer-tag "(*REMAILER*)"
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105 "A string which marks an Email address as belonging to a remailer.")
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106
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107 (defvar mc-levien-file-name "~/.remailers"
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108 "The file containing a Levien format list of remailers.
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109
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110 The file is read by `mc-read-levien-file' and `mc-reread-levien-file'.
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111
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112 The file should include lines of the following form (other lines
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113 are ignored):
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114
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115 $remailer{\"NAME\"} = \"<EMAIL ADDRESS> PROPERTIES\";
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116
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117 PROPERTIES is a space-separated set of strings.
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118
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119 This format is named after Raphael Levien, who maintains a list of
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120 active remailers. Do \"finger remailer-list@kiwi.cs.berkeley.edu\"
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121 for the latest copy of his list.")
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122
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123 (defvar mc-remailer-user-chains nil
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124 "An alist of remailer chains defined by the user.
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125
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126 Format is
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127
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128 ((NAME . REMAILER-LIST)
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129 (NAME . REMAILER-LIST)
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130 ...)
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131
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132 NAME must be a string.
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133
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134 REMAILER-LIST may be an arbitrary sequence, not just a list. Its
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135 elements may be any of the following:
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136
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137 1) A remailer structure created by `mc-remailer-create'. This is
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138 the base case.
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139
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140 2) A string naming another remailer chain to be spliced in
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141 at this point.
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142
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143 3) A positive integer N representing a chain to be spliced in at this
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144 point and consisting of a random permutation of the top N remailers
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145 as ordered in the file `mc-levien-file-name'.
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146
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147 4) An arbitrary Lisp form to be evaluated, which should
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148 return another REMAILER-LIST to be recursively processed and
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149 spliced in at this point.
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150
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151 The complete alist of chains is given by the union of the two lists
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152 `mc-remailer-internal-chains' and `mc-remailer-user-chains'.")
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153
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154 (defvar mc-remailer-internal-chains nil
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155 "List of \"internal\" remailer chains.
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156
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157 This variable is normally generated automatically from a human-readable
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158 list of remailers; see, for example, the function `mc-reread-levien-file'.
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159
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160 To define your own chains, you probably want to use the variable
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161 `mc-remailer-user-chains'. See that variable's documentation for
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162 format information.")
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163
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164 (defvar mc-remailer-internal-ranking nil
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165 "Ordered list of remailers, most reliable first.
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166
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167 This variable is normally generated automatically from a human-readable
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168 list of remailers; see, for example, the function `mc-reread-levien-file'.")
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169
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170 (defvar mc-remailer-user-response-block
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171 (function
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172 (lambda (addr lines block)
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173 (concat
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174 ";;;\n"
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175 (format
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176 "To reply to this message, take the following %d-line block, remove\n"
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177 lines)
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178 "leading \"- \" constructs (if any), and place it at the top of a\n"
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179 (format "message to %s :\n" addr)
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180 block)))
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181 "A function called to generate response block text.
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182
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183 Value should be a function taking three arguments (ADDR LINES BLOCK).
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184 ADDR is the address to which the response should be sent.
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185 LINES is the number of lines in the encrypted response block.
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186 BLOCK is the response block itself.
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187 Function should return a string to be inserted into the buffer
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188 by mc-remailer-insert-response-block.")
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189
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190 (defvar mc-remailer-pseudonyms nil
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191 "*A list of your pseudonyms.
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192
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193 This is a list of strings. Completion against it will be available
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194 when you are prompted for your pseudonym.")
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195
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196 (defvar mc-remailer-preserved-headers
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197 '("References" "Followup-to" "In-reply-to")
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198 "*Header fields which are preserved as hashmark headers when rewriting.
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199
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200 This is a list of strings naming the preserved headers. Note that
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201 \"Subject\", \"Newsgroups\", and \"To\" are handled specially and
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202 should not be included in this list.")
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203
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204 ;;}}}
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205 ;;{{{ Handling Levien format remailer lists
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206
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207 (defun mc-parse-levien-buffer ()
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208 ;; Parse a buffer in Levien format.
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209 (goto-char (point-min))
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210 (let (chains remailer remailer-name ranking)
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211 (while
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212 (re-search-forward
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213 "^\\$remailer{\"\\(.+\\)\"}[ \t]*=[ \t]*\"\\(.*\\)\";"
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214 nil t)
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215 (let ((name (buffer-substring-no-properties
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216 (match-beginning 1) (match-end 1)))
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217 property-list address
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218 (value-start (match-beginning 2))
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219 (value-end (match-end 2)))
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220 (goto-char value-start)
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221 (while (re-search-forward "[^ \t]+" value-end 'no-error)
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222 (setq property-list
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223 (append
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224 property-list
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225 (list (buffer-substring-no-properties
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226 (match-beginning 0) (match-end 0))))))
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227 (setq address (car property-list)
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228 property-list (cdr property-list)
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229 remailer-name name)
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230 (if (not
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231 (or (member "mix" property-list)
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232 (and (or (member "pgp" property-list)
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233 (member "pgp." property-list))
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234 (or (member "cpunk" property-list)
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235 (member "eric" property-list)))))
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236 (setq remailer nil)
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237 (setq remailer
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238 (mc-remailer-create
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239 address ; Address
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240 (if (member "pgp." property-list)
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241 name) ; User ID
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242 property-list
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243 '(mc-generic-pre-encrypt-function) ; Pre-encrypt hooks
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244 '(mc-generic-post-encrypt-function) ; Post-encrypt hooks
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245 ))))
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246 (if (not (null remailer))
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247 (setq chains (cons (list remailer-name remailer) chains))))
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248 (goto-char (point-min))
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249 (if (re-search-forward "----------" nil t)
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250 (while (re-search-forward "^\\([a-zA-Z0-9\\-]+\\) " nil t)
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251 (setq remailer-name (buffer-substring-no-properties
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252 (match-beginning 1) (match-end 1)))
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253 (if (assoc remailer-name chains)
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254 (setq ranking (append ranking (list remailer-name))))))
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255 (cons chains ranking)))
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256
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257 (defun mc-read-levien-file ()
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258 "Read the Levien format file specified in `mc-levien-file-name'.
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259 Return an alist of length-1 chains, one for each remailer, named
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260 after the remailer. Only include remailers supporting PGP
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261 encryption."
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262 (save-excursion
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263 (if (file-readable-p mc-levien-file-name)
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264 (prog2
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265 (find-file-read-only mc-levien-file-name)
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266 (mc-parse-levien-buffer)
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267 (bury-buffer)))))
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268
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269 (defun mc-reread-levien-file ()
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270 "Read the Levien format file specified in `mc-levien-file-name'.
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271
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272 Place result in `mc-remailer-internal-chains' and `mc-remailer-internal-ranking'.
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273
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274 See the documentation for the variable `mc-levien-file-name' for
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275 a description of Levien file format."
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276 (interactive)
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277 (let ((parsed-levien-file (mc-read-levien-file)))
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278 (setq mc-remailer-internal-chains (car parsed-levien-file)
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279 mc-remailer-internal-ranking (cdr parsed-levien-file))))
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280
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281 ;;}}}
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282 ;;{{{ Arbitrary chain choice
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283
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284 (defun mc-remailer-choose-first (n &optional l)
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285 (cond
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286 ((= n 0) nil)
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287 ((null l) (mc-remailer-choose-first n mc-remailer-internal-ranking))
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288 (t (cons (car l) (mc-remailer-choose-first (1- n) (cdr l))))))
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289
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290 (defun mc-remailer-choose-chain (n)
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291 (if (null mc-remailer-internal-ranking)
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292 (error "No ranking information, cannot choose the %d best remailer%s"
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293 n (if (> n 1) "s" "")))
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294 (append (shuffle-vector (vconcat (mc-remailer-choose-first n)))
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295 nil))
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296
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297 ;;}}}
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298 ;;{{{ Canonicalization function
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299
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300 (defun mc-remailer-canonicalize-elmt (elmt chains-alist)
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301 (cond
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302 ((mc-remailerp elmt) (list elmt))
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303 ((stringp elmt)
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304 (mc-remailer-canonicalize-chain (cdr (assoc elmt chains-alist))
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305 chains-alist))
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306 ((integerp elmt)
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307 (mc-remailer-canonicalize-chain (mc-remailer-choose-chain elmt)
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308 chains-alist))
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309 (t (mc-remailer-canonicalize-chain (eval elmt) chains-alist))))
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310
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311 (defun mc-remailer-canonicalize-chain (chain &optional chains-alist)
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312 ;; Canonicalize a remailer chain with respect to CHAINS-ALIST.
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313 ;; That is, use CHAINS-ALIST to resolve strings.
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314 ;; Here is where we implement the functionality described in
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315 ;; the documentation for the variable `mc-remailer-user-chains'.
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316 (if (null chains-alist)
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317 (setq chains-alist (mc-remailer-make-chains-alist)))
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318 (cond
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319 ((null chain) nil)
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320 ;; Handle case where chain is actually a string or a single
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321 ;; remailer.
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322 ((or (stringp chain) (mc-remailerp chain) (integerp chain))
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323 (mc-remailer-canonicalize-elmt chain chains-alist))
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324 (t
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325 (let ((first (elt chain 0))
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326 (rest (cdr (append chain nil))))
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327 (append
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328 (mc-remailer-canonicalize-elmt first chains-alist)
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329 (mc-remailer-canonicalize-chain rest chains-alist))))))
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330
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331 ;;}}}
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332 ;;{{{ Auxiliaries for mail header munging
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333
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334 (defsubst mc-nuke-field (field &optional bounds)
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335 ;; Delete all fields exactly matching regexp FIELD from header,
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336 ;; bounded by BOUNDS. Default is entire visible region of buffer.
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337 (mc-get-fields field bounds t))
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338
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339 (defun mc-replace-field (field-name replacement header)
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340 (save-excursion
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341 (save-restriction
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342 (if (not (string-match "^[ \t]" replacement))
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343 (setq replacement (concat " " replacement)))
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344 (if (not (string-match "\n$" replacement))
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345 (setq replacement (concat replacement "\n")))
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346 (let ((case-fold-search t)
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347 (field-regexp (regexp-quote field-name)))
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348 (narrow-to-region (car header) (cdr header))
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349 (goto-char (point-min))
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350 (re-search-forward
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351 (concat "^" field-regexp ":" mc-field-body-regexp)
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352 nil t)
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353 (mc-nuke-field field-regexp header)
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354 (insert field-name ":" replacement)))))
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355
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356 (defun mc-find-main-header (&optional ignored)
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357 ;; Find the main header of the mail message; return as a pair of
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358 ;; markers (START . END).
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359 (save-excursion
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360 (goto-char (point-min))
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361 (re-search-forward
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362 (concat "^" (regexp-quote mail-header-separator) "\n"))
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363 (forward-line -1)
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364 (cons (copy-marker (point-min)) (copy-marker (point)))))
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365
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366 (defun mc-find-colon-header (&optional insert)
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367 ;; Find the header with a "::" immediately after the
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368 ;; mail-header-separator. Return region enclosing header. Optional
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369 ;; arg INSERT means insert the header if it does not exist already.
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370 (save-excursion
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371 (goto-char (point-min))
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372 (re-search-forward
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373 (concat "^" (regexp-quote mail-header-separator) "\n"))
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374 (if (or (and (looking-at "::\n") (forward-line 1))
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375 (and insert
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376 (progn
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377 (insert-before-markers "::\n\n")
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|
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378 (forward-line -1))))
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|
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379 (let ((start (point)))
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|
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380 (re-search-forward "^$" nil 'move)
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|
|
381 (cons (copy-marker start) (copy-marker (point)))))))
|
|
|
382
|
|
|
383 (defun mc-find-hash-header (&optional insert)
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|
384 (save-excursion
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385 (goto-char (point-min))
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|
386 (re-search-forward
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|
|
387 (concat "^" (regexp-quote mail-header-separator) "\n"))
|
|
|
388 (if (or (and (looking-at "##\n") (forward-line 1))
|
|
|
389 (and (looking-at "::\n")
|
|
|
390 (re-search-forward "^\n" nil 'move)
|
|
|
391 (looking-at "##\n")
|
|
|
392 (forward-line 1))
|
|
|
393 (and insert
|
|
|
394 (progn
|
|
|
395 (insert-before-markers "##\n\n")
|
|
|
396 (forward-line -1))))
|
|
|
397 (let ((start (point)))
|
|
|
398 (re-search-forward "^$" nil 'move)
|
|
|
399 (cons (copy-marker start) (copy-marker (point)))))))
|
|
|
400
|
|
|
401
|
|
|
402 (defsubst mc-replace-main-field (field replacement)
|
|
|
403 (mc-replace-field field replacement (mc-find-main-header t)))
|
|
|
404
|
|
|
405 (defsubst mc-replace-hash-field (field replacement)
|
|
|
406 (mc-replace-field field replacement (mc-find-hash-header t)))
|
|
|
407
|
|
|
408 (defsubst mc-replace-colon-field (field replacement)
|
|
|
409 (mc-replace-field field replacement (mc-find-colon-header t)))
|
|
|
410
|
|
|
411 (defun mc-recipient-is-remailerp ()
|
|
|
412 (let ((to (mc-get-fields "To" (mc-find-main-header))))
|
|
|
413 (and to
|
|
|
414 (string-match (regexp-quote mc-remailer-tag) (cdr (car to))))))
|
|
|
415
|
|
|
416 ;;}}}
|
|
|
417 ;;{{{ Pre-encryption and post-encryption hook defaults
|
|
|
418
|
|
|
419 (defun mc-generic-post-encrypt-function (remailer)
|
|
|
420 (let ((main-header (mc-find-main-header))
|
|
|
421 (colon-header (mc-find-colon-header t)))
|
|
|
422 (mc-replace-field "Encrypted" "PGP" colon-header)
|
|
|
423 (mc-replace-field
|
|
|
424 "To"
|
|
|
425 (concat (mc-remailer-address remailer) " " mc-remailer-tag)
|
|
|
426 main-header)))
|
|
|
427
|
|
|
428 (defun mc-generic-pre-encrypt-function (remailer)
|
|
|
429 (let ((addr (mc-remailer-address remailer))
|
|
|
430 (props (mc-remailer-properties remailer))
|
|
|
431 (main-header (mc-find-main-header))
|
|
|
432 (colon-header (mc-find-colon-header t))
|
|
|
433 to to-field preserved-regexp preserved)
|
|
|
434
|
|
|
435 (setq preserved-regexp
|
|
|
436 (mc-disjunction-regexp mc-remailer-preserved-headers))
|
|
|
437 (setq preserved (mc-get-fields preserved-regexp main-header t))
|
|
|
438 (if preserved (goto-char (cdr (mc-find-hash-header t))))
|
|
|
439 (mapcar (function
|
|
|
440 (lambda (c)
|
|
|
441 (insert (car c) ":"
|
|
|
442 (mc-eliminate-continuation-lines (cdr c)))))
|
|
|
443 preserved)
|
|
|
444
|
|
|
445 (if (and (mc-find-hash-header) (not (member "hash" props)))
|
|
|
446 (error "Remailer %s does not support hashmarks" addr))
|
|
|
447
|
|
|
448 (if (mc-get-fields "Newsgroups" main-header)
|
|
|
449 (cond ((not (member "post" props))
|
|
|
450 (error "Remailer %s does not support posting" addr))
|
|
|
451 ((not (member "hash" props))
|
|
|
452 (error "Remailer %s does not support hashmarks" addr))
|
|
|
453 (t (mc-rewrite-news-to-mail remailer)))
|
|
|
454 (and (featurep 'mailalias)
|
|
|
455 (not (featurep 'mail-abbrevs))
|
|
|
456 mail-aliases
|
|
|
457 (expand-mail-aliases (car main-header) (cdr main-header)))
|
|
|
458 (setq to (mc-strip-addresses
|
|
|
459 (mapcar 'cdr (mc-get-fields "To" main-header))))
|
|
|
460 (if (string-match "," to)
|
|
|
461 (error "Remailer %s does not support multiple recipients." addr))
|
|
|
462 (setq to-field
|
|
|
463 (if (mc-get-fields "From" colon-header)
|
|
|
464 "Send-To"
|
|
|
465 (cond
|
|
|
466 ((member "eric" props) "Anon-Send-To")
|
|
|
467 ((member "cpunk" props) "Request-Remailing-To")
|
|
|
468 (t (error "Remailer %s is not type-1" addr)))))
|
|
|
469 (mc-replace-field to-field to colon-header)
|
|
|
470 (mc-nuke-field "Reply-to" main-header))))
|
|
|
471
|
|
|
472 ;;}}}
|
|
|
473 ;;{{{ Misc. random
|
|
|
474
|
|
|
475 (defun mc-disjunction-regexp (regexps)
|
|
|
476 ;; Take a list of regular expressions and return a single
|
|
|
477 ;; regular expression which matches anything that any of the
|
|
|
478 ;; original regexps match.
|
|
|
479 (concat "\\("
|
|
|
480 (mapconcat 'identity regexps "\\)\\|\\(")
|
|
|
481 "\\)"))
|
|
|
482
|
|
|
483 (defun mc-user-mail-address ()
|
|
|
484 "Figure out the user's Email address as best we can."
|
|
|
485 (mc-strip-address
|
|
|
486 (cond ((and (boundp 'gnus-user-from-line)
|
|
|
487 (stringp gnus-user-from-line))
|
|
|
488 gnus-user-from-line)
|
|
|
489 ((stringp mail-default-reply-to) mail-default-reply-to)
|
|
|
490 ((boundp 'user-mail-address) user-mail-address)
|
|
|
491 (t (concat (user-login-name) "@" (system-name))))))
|
|
|
492
|
|
|
493 (defun mc-eliminate-continuation-lines (string)
|
|
|
494 (while (string-match "\n[\t ]+" string)
|
|
|
495 (setq string (replace-match " " t nil string)))
|
|
|
496 string)
|
|
|
497
|
|
|
498 (defun mc-remailer-make-chains-alist ()
|
|
|
499 (if (null mc-remailer-internal-chains)
|
|
|
500 (mc-reread-levien-file))
|
|
|
501 (append mc-remailer-internal-chains mc-remailer-user-chains))
|
|
|
502
|
|
|
503 ;;;###autoload
|
|
|
504 (defun mc-remailer-insert-pseudonym ()
|
|
|
505 "Insert pseudonym as a From field in the hash-mark header.
|
|
|
506
|
|
|
507 See the documentation for the variable `mc-remailer-pseudonyms' for
|
|
|
508 more information."
|
|
|
509 (interactive)
|
|
|
510 (let ((completion-ignore-case t)
|
|
|
511 pseudonym)
|
|
|
512 (setq pseudonym
|
|
|
513 (cond ((null mc-remailer-pseudonyms)
|
|
|
514 (read-from-minibuffer "Pseudonym: "))
|
|
|
515 (t
|
|
|
516 (completing-read "Pseudonym: "
|
|
|
517 (mapcar 'list mc-remailer-pseudonyms)))))
|
|
|
518 (if (not (string-match "\\S +@\\S +" pseudonym))
|
|
|
519 (setq pseudonym (concat pseudonym " <x@x.x>")))
|
|
|
520 (mc-replace-colon-field "From" pseudonym)))
|
|
|
521
|
|
|
522 ;;}}}
|
|
|
523 ;;{{{ Mixmaster support
|
|
|
524 (defvar mc-mixmaster-path nil
|
|
|
525 "*Path to the Mixmaster binary. If defined, Mixmaster chains will
|
|
|
526 be passed to this program for rewriting.")
|
|
|
527
|
|
|
528 (defvar mc-mixmaster-list-path nil
|
|
|
529 "*Path to the Mixmaster type2.list file.")
|
|
|
530
|
|
|
531 (defun mc-demix (&rest chain)
|
|
|
532 "Use arguments as a remailer-list and return a new list with the
|
|
|
533 \"mix\" property removed from all the elements."
|
|
|
534 (mapcar (function (lambda (r) (mc-remailer-remove-property r "mix")))
|
|
|
535 (mc-remailer-canonicalize-chain chain)))
|
|
|
536
|
|
|
537 (defun mc-mixmaster-process (beg end recipients preserved mix-chain)
|
|
|
538 ;; Run a region through Mixmaster.
|
|
|
539 (let (ret)
|
|
|
540 (if (not (markerp end))
|
|
|
541 (setq end (copy-marker end)))
|
|
|
542 (goto-char beg)
|
|
|
543 (mapcar (function (lambda (x) (insert x ?\n))) recipients)
|
|
|
544 (insert ?\n)
|
|
|
545 (mapcar (function (lambda (x) (insert x))) preserved)
|
|
|
546 (insert ?\n)
|
|
|
547 (setq mix-chain (mapcar (function (lambda (x) (format "%d" x))) mix-chain))
|
|
|
548 ;; Handle case of empty message
|
|
|
549 (if (< end (point)) (setq end (point)))
|
|
|
550 (setq ret
|
|
|
551 (apply 'call-process-region beg end mc-mixmaster-path t t nil
|
|
|
552 "-f" "-o" "stdout" "-l" mix-chain))
|
|
|
553 (if (not (eq ret 0)) (error "Mixmaster barfed."))
|
|
|
554 (goto-char beg)
|
|
|
555 (re-search-forward "^::$")
|
|
|
556 (delete-region beg (match-beginning 0))))
|
|
|
557
|
|
|
558 (defun mc-mixmaster-build-alist (&optional n)
|
|
|
559 ;; Construct an alist mapping Mixmaster Email addresses to integers.
|
|
|
560 ;; FIXME; this is terrible
|
|
|
561 (let (buf)
|
|
|
562 (save-excursion
|
|
|
563 (unwind-protect
|
|
|
564 (progn
|
|
|
565 (setq n (or n 1))
|
|
|
566 (setq buf (find-file-noselect mc-mixmaster-list-path))
|
|
|
567 (set-buffer buf)
|
|
|
568 (if (re-search-forward "^[^ \t]+[ \t]+\\([^ \t]+\\)" nil t)
|
|
|
569 (cons (cons (buffer-substring-no-properties
|
|
|
570 (match-beginning 1) (match-end 1))
|
|
|
571 n)
|
|
|
572 (mc-mixmaster-build-alist (+ n 1)))))
|
|
|
573 (if buf (kill-buffer buf))))))
|
|
|
574
|
|
|
575 (defvar mc-mixmaster-alist nil)
|
|
|
576
|
|
|
577 (defsubst mc-mixmaster-alist ()
|
|
|
578 (or mc-mixmaster-alist
|
|
|
579 (setq mc-mixmaster-alist (mc-mixmaster-build-alist))))
|
|
|
580
|
|
|
581 (defun mc-mixmaster-translate-chain (chain)
|
|
|
582 ;; Take a chain of Mixmaster remailers and convert it to the list
|
|
|
583 ;; of integers which represents them.
|
|
|
584 (if (or (null chain)
|
|
|
585 (not (member "mix" (mc-remailer-properties (car chain)))))
|
|
|
586 nil
|
|
|
587 (cons (cdr (assoc (mc-strip-address (mc-remailer-address (car chain)))
|
|
|
588 (mc-mixmaster-alist)))
|
|
|
589 (mc-mixmaster-translate-chain (cdr chain)))))
|
|
|
590
|
|
|
591 (defun mc-mixmaster-skip (chain)
|
|
|
592 ;; Return the largest possible suffix of CHAIN whose first element
|
|
|
593 ;; is not a Mixmaster.
|
|
|
594 (cond ((null chain) nil)
|
|
|
595 ((not (member "mix" (mc-remailer-properties (car chain))))
|
|
|
596 chain)
|
|
|
597 (t (mc-mixmaster-skip (cdr chain)))))
|
|
|
598
|
|
|
599 (defun mc-rewrite-for-mixmaster (chain &optional pause)
|
|
|
600 ;; Rewrite the current mail buffer for a chain of Mixmasters.
|
|
|
601 (let ((mix-chain (mc-mixmaster-translate-chain chain))
|
|
|
602 (main-header (mc-find-main-header))
|
|
|
603 (colon-header (mc-find-colon-header))
|
|
|
604 (hash-header (mc-find-hash-header))
|
|
|
605 recipients preserved newsgroups first last rest preserved-regexp)
|
|
|
606
|
|
|
607 ;; Figure out FIRST and LAST. FIRST is the first Mixmaster in the
|
|
|
608 ;; chain. LAST is the last.
|
|
|
609 (setq first (car chain)
|
|
|
610 rest chain)
|
|
|
611 (while (and rest (member "mix" (mc-remailer-properties (car rest))))
|
|
|
612 (setq last (car rest)
|
|
|
613 rest (cdr rest)))
|
|
|
614
|
|
|
615 ;; If recipient is not a remailer, deal with hashmark and colon
|
|
|
616 ;; headers and get rid of them.
|
|
|
617 (if (mc-recipient-is-remailerp)
|
|
|
618 nil
|
|
|
619 (if hash-header
|
|
|
620 (progn
|
|
|
621 (setq preserved (mc-get-fields nil hash-header))
|
|
|
622 (goto-char (car hash-header))
|
|
|
623 (forward-line -1)
|
|
|
624 (delete-region (point) (+ (cdr hash-header) 1))))
|
|
|
625 ;; Preserve pseduonym line...
|
|
|
626 (if colon-header
|
|
|
627 (progn
|
|
|
628 (setq preserved
|
|
|
629 (append (mc-get-fields "From" colon-header) preserved))
|
|
|
630 (goto-char (car colon-header))
|
|
|
631 (forward-line -1)
|
|
|
632 (delete-region (point) (+ (cdr colon-header) 1)))))
|
|
|
633
|
|
|
634 ;; Expand aliases and get recipients.
|
|
|
635 (and (featurep 'mailalias)
|
|
|
636 (not (featurep 'mail-abbrevs))
|
|
|
637 mail-aliases
|
|
|
638 (expand-mail-aliases (car main-header) (cdr main-header)))
|
|
|
639 (setq recipients
|
|
|
640 (mc-cleanup-recipient-headers
|
|
|
641 (mapconcat 'cdr (mc-get-fields "To" main-header t) ", ")))
|
|
|
642 (setq newsgroups (mc-get-fields "Newsgroups" nil t))
|
|
|
643 ;; Mixmaster does not support posting...
|
|
|
644 ;;; (if (and newsgroups
|
|
|
645 ;;; (not (member "post" (mc-remailer-properties last))))
|
|
|
646 (if newsgroups
|
|
|
647 (error "Remailer %s does not support posting"
|
|
|
648 (mc-remailer-address last)))
|
|
|
649 (setq
|
|
|
650 recipients
|
|
|
651 (append (mapcar
|
|
|
652 (function (lambda (c) (concat "Post:" (cdr c)))) newsgroups)
|
|
|
653 recipients))
|
|
|
654
|
|
|
655 (setq
|
|
|
656 preserved-regexp
|
|
|
657 (mc-disjunction-regexp (cons "Subject" mc-remailer-preserved-headers)))
|
|
|
658
|
|
|
659 (setq preserved
|
|
|
660 (append (mc-get-fields preserved-regexp main-header t) preserved))
|
|
|
661
|
|
|
662 ;; Convert preserved header alist to simple list of strings
|
|
|
663 (setq preserved
|
|
|
664 (mapcar
|
|
|
665 (function
|
|
|
666 (lambda (c)
|
|
|
667 (concat (car c) ":"
|
|
|
668 (mc-eliminate-continuation-lines (cdr c)))))
|
|
|
669 preserved))
|
|
|
670
|
|
|
671 ;; Do the conversion
|
|
|
672 (goto-char (cdr main-header))
|
|
|
673 (forward-line 1)
|
|
|
674 (mc-mixmaster-process (point) (point-max) recipients preserved
|
|
|
675 mix-chain)
|
|
|
676
|
|
|
677 (mc-replace-field "To"
|
|
|
678 (concat
|
|
|
679 (mc-remailer-address first) " " mc-remailer-tag)
|
|
|
680 main-header)))
|
|
|
681
|
|
|
682 ;;}}}
|
|
|
683 ;;{{{ High level message rewriting
|
|
|
684
|
|
|
685 (defun mc-rewrite-news-to-mail (remailer)
|
|
|
686 (let ((main-header (mc-find-main-header))
|
|
|
687 newsgroups)
|
|
|
688 (setq newsgroups (mc-get-fields "Newsgroups" main-header t))
|
|
|
689 (mc-replace-colon-field "Post-To" (cdr (car newsgroups)))
|
|
|
690 (mail-mode)))
|
|
|
691
|
|
|
692 (defun mc-rewrite-for-remailer (remailer &optional pause)
|
|
|
693 ;; Rewrite the current mail buffer for a single remailer. This
|
|
|
694 ;; includes running the pre-encryption hooks, modifying the To:
|
|
|
695 ;; field, encrypting with the remailer's public key, and running the
|
|
|
696 ;; post-encryption hooks.
|
|
|
697 (let ((addr (mc-remailer-address remailer))
|
|
|
698 (main-header (mc-find-main-header)))
|
|
|
699 ;; If recipient is already a remailer, make sure the "::" and "##"
|
|
|
700 ;; headers get to it
|
|
|
701 (if (mc-recipient-is-remailerp)
|
|
|
702 (progn
|
|
|
703 (goto-char (cdr main-header))
|
|
|
704 (forward-line 1)
|
|
|
705 (insert "::\n\n")))
|
|
|
706
|
|
|
707 (mapcar
|
|
|
708 (function (lambda (hook) (funcall hook remailer)))
|
|
|
709 (mc-remailer-pre-encrypt-hooks remailer))
|
|
|
710
|
|
|
711 ;; Move "Subject" lines down.
|
|
|
712 (goto-char (car (mc-find-colon-header t)))
|
|
|
713 (mapcar
|
|
|
714 (function (lambda (f) (insert (car f) ":" (cdr f))))
|
|
|
715 (mc-get-fields "Subject" main-header t))
|
|
|
716
|
|
|
717 (if pause
|
|
|
718 (let ((cursor-in-echo-area t))
|
|
|
719 (message "SPC to encrypt for %s : " addr)
|
|
|
720 (read-char-exclusive)))
|
|
|
721 (setq main-header (mc-find-main-header))
|
|
|
722 (goto-char (cdr main-header))
|
|
|
723 (forward-line 1)
|
|
|
724 (if (let ((mc-pgp-always-sign 'never)
|
|
|
725 (mc-encrypt-for-me nil))
|
|
|
726 (mc-encrypt-message (mc-remailer-userid remailer) nil (point)))
|
|
|
727 (progn
|
|
|
728 (mapcar
|
|
|
729 (function (lambda (hook) (funcall hook remailer)))
|
|
|
730 (mc-remailer-post-encrypt-hooks remailer))
|
|
|
731 (mc-nuke-field "Comment")
|
|
|
732 (mc-nuke-field "From"))
|
|
|
733 (error "Unable to encrypt message to %s"
|
|
|
734 (mc-remailer-userid remailer)))))
|
|
|
735
|
|
|
736 (defun mc-rewrite-for-chain (chain &optional pause)
|
|
|
737 ;; Rewrite the current buffer for a chain of remailers.
|
|
|
738 ;; CHAIN must be in canonical form.
|
|
|
739 (let (rest)
|
|
|
740 (if mc-mixmaster-path
|
|
|
741 (setq rest (mc-mixmaster-skip chain))
|
|
|
742 (setq rest chain))
|
|
|
743 (if (null chain) nil
|
|
|
744 (mc-rewrite-for-chain
|
|
|
745 (if (eq rest chain) (cdr rest) rest) pause)
|
|
|
746 (if (eq rest chain)
|
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|
747 (mc-rewrite-for-remailer (car chain) pause)
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|
|
748 (mc-rewrite-for-mixmaster chain pause)))))
|
|
|
749
|
|
|
750 (defun mc-unparse-chain (chain)
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|
|
751 ;; Unparse CHAIN into a string suitable for printing.
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|
|
752 (if (null chain)
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|
|
753 nil
|
|
|
754 (concat (mc-remailer-address (car chain)) "\n"
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|
|
755 (mc-unparse-chain (cdr chain)))))
|
|
|
756
|
|
|
757 (defun mc-disallow-field (field &optional header)
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|
|
758 (let ((case-fold-search t))
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|
|
759 (if (null header)
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|
|
760 (setq header (mc-find-main-header)))
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|
|
761 (goto-char (car header))
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|
|
762 (if (re-search-forward (concat "^" (regexp-quote field) ":")
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|
|
763 (cdr header) t)
|
|
|
764
|
|
|
765 (progn
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|
|
766 (goto-char (match-beginning 0))
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|
|
767 (error "Cannot use a %s field." field)))))
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|
|
768
|
|
|
769 ;;;###autoload
|
|
|
770 (defun mc-remailer-encrypt-for-chain (&optional pause)
|
|
|
771 "Encrypt message for a remailer chain, prompting for chain to use.
|
|
|
772
|
|
|
773 With \\[universal-argument], pause before each encryption."
|
|
|
774 (interactive "P")
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|
|
775 (let ((chains (mc-remailer-make-chains-alist))
|
|
|
776 (buffer (get-buffer-create mc-buffer-name))
|
|
|
777 chain-name chain)
|
|
|
778 (mc-disallow-field "CC")
|
|
|
779 (mc-disallow-field "FCC")
|
|
|
780 (mc-disallow-field "BCC")
|
|
|
781 (setq chain-name
|
|
|
782 (completing-read
|
|
|
783 "Choose a remailer or chain: " chains nil 'strict-match))
|
|
|
784 (setq chain
|
|
|
785 (mc-remailer-canonicalize-chain
|
|
|
786 (cdr (assoc chain-name chains))
|
|
|
787 chains))
|
|
|
788 (mc-rewrite-for-chain chain pause)
|
|
|
789 (if chain
|
|
|
790 (save-excursion
|
|
|
791 (set-buffer buffer)
|
|
|
792 (erase-buffer)
|
|
|
793 (insert "Rewritten for chain `" chain-name "':\n\n"
|
|
|
794 (mc-unparse-chain chain))
|
|
|
795 (message "Done. See %s buffer for details." mc-buffer-name)))))
|
|
|
796
|
|
|
797 ;;}}}
|
|
|
798 ;;{{{ Response block generation
|
|
|
799
|
|
|
800 ;;;###autoload
|
|
|
801 (defun mc-remailer-insert-response-block (&optional arg)
|
|
|
802 "Insert response block at point, prompting for chain to use.
|
|
|
803
|
|
|
804 With \\[universal-argument], enter a recursive edit of the innermost
|
|
|
805 layer of the block before encrypting it."
|
|
|
806 (interactive "p")
|
|
|
807 (let (buf main-header to addr block lines)
|
|
|
808 (save-excursion
|
|
|
809 (setq buf
|
|
|
810 (mc-remailer-make-response-block (if (> arg 1) t)))
|
|
|
811 (set-buffer buf)
|
|
|
812 (setq main-header (mc-find-main-header))
|
|
|
813 (setq to (cdr (car (mc-get-fields "To" main-header))))
|
|
|
814 (setq addr (concat "<" (mc-strip-address to) ">"))
|
|
|
815 (goto-char (cdr main-header))
|
|
|
816 (forward-line 1)
|
|
|
817 (setq block (buffer-substring-no-properties
|
|
|
818 (point) (point-max))
|
|
|
819 lines (count-lines (point) (point-max)))
|
|
|
820 (kill-buffer buf))
|
|
|
821 (let ((opoint (point)))
|
|
|
822 (insert (funcall mc-remailer-user-response-block
|
|
|
823 addr lines block))
|
|
|
824 (goto-char opoint))
|
|
|
825 (mc-nuke-field "Reply-to" (mc-find-main-header))
|
|
|
826 (mc-replace-hash-field "Reply-to" addr)))
|
|
|
827
|
|
|
828 (defun mc-remailer-make-response-block (&optional recurse)
|
|
|
829 ;; Return a buffer which contains a response block
|
|
|
830 ;; for the user, and a To: header for the remailer to use.
|
|
|
831 (let ((buf (generate-new-buffer " *Remailer Response Block*"))
|
|
|
832 (original-buf (current-buffer))
|
|
|
833 (mc-mixmaster-path nil)
|
|
|
834 all-headers included-regexp included)
|
|
|
835 (setq all-headers (mc-find-main-header))
|
|
|
836 (setcdr all-headers
|
|
|
837 (max
|
|
|
838 (cdr all-headers)
|
|
|
839 (or (cdr-safe (mc-find-colon-header)) 0)
|
|
|
840 (or (cdr-safe (mc-find-hash-header)) 0)))
|
|
|
841 (save-excursion
|
|
|
842 (setq
|
|
|
843 included-regexp
|
|
|
844 (mc-disjunction-regexp mc-response-block-included-headers))
|
|
|
845 (setq included (mc-get-fields included-regexp all-headers))
|
|
|
846 (set-buffer buf)
|
|
|
847 (insert "To: " (mc-user-mail-address) "\n" mail-header-separator "\n")
|
|
|
848 (insert ";; Response block created " (current-time-string) "\n")
|
|
|
849 (mapcar (function (lambda (c) (insert "; " (car c) ":" (cdr c))))
|
|
|
850 included)
|
|
|
851 (if recurse
|
|
|
852 (progn
|
|
|
853 (switch-to-buffer buf)
|
|
|
854 (message "Editing response block ; %s when done."
|
|
|
855 (substitute-command-keys "\\[exit-recursive-edit]"))
|
|
|
856 (recursive-edit)))
|
|
|
857 (set-buffer buf)
|
|
|
858 (mc-remailer-encrypt-for-chain)
|
|
|
859 (switch-to-buffer original-buf))
|
|
|
860 buf))
|
|
|
861
|
|
|
862 ;;}}}
|
