prosody
10dc228a45a4
util/sasl/digest-md5.lua

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util/sasl/digest-md5.lua @ 6351:10dc228a45a4

mod_blocklist: Correct comment
author Kim Alvefur <zash@zash.se>
date Tue, 12 Aug 2014 15:40:00 +0200
parent 5301:6279caf921f1
child 6777:5de6b93d0190
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- sasl.lua v0.4
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2 -- Copyright (C) 2008-2010 Tobias Markmann
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3 --
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4 -- All rights reserved.
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5 --
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6 -- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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7 --
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8 -- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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9 -- * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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10 -- * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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11 --
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12 -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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13
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14 local tostring = tostring;
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15 local type = type;
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16
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17 local s_gmatch = string.gmatch;
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18 local s_match = string.match;
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19 local t_concat = table.concat;
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20 local t_insert = table.insert;
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21 local to_byte, to_char = string.byte, string.char;
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22
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23 local md5 = require "util.hashes".md5;
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24 local log = require "util.logger".init("sasl");
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25 local generate_uuid = require "util.uuid".generate;
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26 local nodeprep = require "util.encodings".stringprep.nodeprep;
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27
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28 module "sasl.digest-md5"
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29
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30 --=========================
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31 --SASL DIGEST-MD5 according to RFC 2831
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32
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33 --[[
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34 Supported Authentication Backends
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35
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36 digest_md5:
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37 function(username, domain, realm, encoding) -- domain and realm are usually the same; for some broken
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38 -- implementations it's not
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39 return digesthash, state;
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40 end
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41
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42 digest_md5_test:
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43 function(username, domain, realm, encoding, digesthash)
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44 return true or false, state;
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45 end
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46 ]]
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47
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48 local function digest(self, message)
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49 --TODO complete support for authzid
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50
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51 local function serialize(message)
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52 local data = ""
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53
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54 -- testing all possible values
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55 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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56 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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57 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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58 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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59 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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60 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
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61 data = data:gsub(",$", "")
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62 return data
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63 end
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64
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65 local function utf8tolatin1ifpossible(passwd)
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66 local i = 1;
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67 while i <= #passwd do
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68 local passwd_i = to_byte(passwd:sub(i, i));
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69 if passwd_i > 0x7F then
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70 if passwd_i < 0xC0 or passwd_i > 0xC3 then
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71 return passwd;
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72 end
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73 i = i + 1;
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74 passwd_i = to_byte(passwd:sub(i, i));
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75 if passwd_i < 0x80 or passwd_i > 0xBF then
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76 return passwd;
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77 end
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78 end
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79 i = i + 1;
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80 end
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81
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82 local p = {};
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83 local j = 0;
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84 i = 1;
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85 while (i <= #passwd) do
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86 local passwd_i = to_byte(passwd:sub(i, i));
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87 if passwd_i > 0x7F then
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88 i = i + 1;
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89 local passwd_i_1 = to_byte(passwd:sub(i, i));
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90 t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
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91 else
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92 t_insert(p, to_char(passwd_i));
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93 end
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94 i = i + 1;
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95 end
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96 return t_concat(p);
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97 end
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98 local function latin1toutf8(str)
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99 local p = {};
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100 for ch in s_gmatch(str, ".") do
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101 ch = to_byte(ch);
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102 if (ch < 0x80) then
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103 t_insert(p, to_char(ch));
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104 elseif (ch < 0xC0) then
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105 t_insert(p, to_char(0xC2, ch));
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106 else
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107 t_insert(p, to_char(0xC3, ch - 64));
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108 end
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109 end
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110 return t_concat(p);
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111 end
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112 local function parse(data)
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113 local message = {}
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114 -- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0")
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115 for k, v in s_gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
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116 message[k] = v;
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117 end
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118 return message;
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119 end
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120
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121 if not self.nonce then
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122 self.nonce = generate_uuid();
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123 self.step = 0;
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124 self.nonce_count = {};
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125 end
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126
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127 self.step = self.step + 1;
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128 if (self.step == 1) then
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129 local challenge = serialize({ nonce = self.nonce,
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130 qop = "auth",
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131 charset = "utf-8",
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132 algorithm = "md5-sess",
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133 realm = self.realm});
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134 return "challenge", challenge;
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135 elseif (self.step == 2) then
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136 local response = parse(message);
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137 -- check for replay attack
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138 if response["nc"] then
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139 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
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140 end
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141
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142 -- check for username, it's REQUIRED by RFC 2831
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143 local username = response["username"];
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144 local _nodeprep = self.profile.nodeprep;
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145 if username and _nodeprep ~= false then
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146 username = (_nodeprep or nodeprep)(username); -- FIXME charset
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147 end
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148 if not username or username == "" then
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149 return "failure", "malformed-request";
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150 end
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151 self.username = username;
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152
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153 -- check for nonce, ...
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154 if not response["nonce"] then
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155 return "failure", "malformed-request";
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156 else
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157 -- check if it's the right nonce
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158 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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159 end
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160
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161 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
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162 if not response["qop"] then response["qop"] = "auth" end
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163
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164 if response["realm"] == nil or response["realm"] == "" then
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165 response["realm"] = "";
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166 elseif response["realm"] ~= self.realm then
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167 return "failure", "not-authorized", "Incorrect realm value";
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168 end
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169
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170 local decoder;
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171 if response["charset"] == nil then
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172 decoder = utf8tolatin1ifpossible;
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173 elseif response["charset"] ~= "utf-8" then
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174 return "failure", "incorrect-encoding", "The client's response uses "..response["charset"].." for encoding with isn't supported by sasl.lua. Supported encodings are latin or utf-8.";
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175 end
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176
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177 local domain = "";
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178 local protocol = "";
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179 if response["digest-uri"] then
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180 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
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181 if protocol == nil or domain == nil then return "failure", "malformed-request" end
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182 else
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183 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
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184 end
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185
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186 --TODO maybe realm support
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e4c5d0d21ac7 util.sasl.digest-md5: Fixing some variable access.
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187 local Y, state;
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188 if self.profile.plain then
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2b0b8fe68df2 util.sasl.*, mod_auth_*, mod_saslauth: Pass SASL handler as first parameter to SASL profile callbacks.
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189 local password, state = self.profile.plain(self, response["username"], self.realm)
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190 if state == nil then return "failure", "not-authorized"
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191 elseif state == false then return "failure", "account-disabled" end
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192 Y = md5(response["username"]..":"..response["realm"]..":"..password);
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193 elseif self.profile["digest-md5"] then
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194 Y, state = self.profile["digest-md5"](self, response["username"], self.realm, response["realm"], response["charset"])
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195 if state == nil then return "failure", "not-authorized"
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196 elseif state == false then return "failure", "account-disabled" end
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197 elseif self.profile["digest-md5-test"] then
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198 -- TODO
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199 end
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200 --local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
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201 --if Y == nil then return "failure", "not-authorized"
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202 --elseif Y == false then return "failure", "account-disabled" end
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203 local A1 = "";
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204 if response.authzid then
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205 if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then
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206 -- COMPAT
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207 log("warn", "Client is violating RFC 3920 (section 6.1, point 7).");
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208 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
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209 else
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210 return "failure", "invalid-authzid";
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211 end
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212 else
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213 A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
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214 end
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215 local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
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216
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217 local HA1 = md5(A1, true);
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218 local HA2 = md5(A2, true);
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219
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220 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
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221 local response_value = md5(KD, true);
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222
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223 if response_value == response["response"] then
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224 -- calculate rspauth
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225 A2 = ":"..protocol.."/"..domain;
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226
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227 HA1 = md5(A1, true);
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228 HA2 = md5(A2, true);
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229
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230 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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231 local rspauth = md5(KD, true);
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232 self.authenticated = true;
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25e1a544a096 util.sasl.digest-md5: Revert changeset 6094a4e2b6f3 as it breaks some clients, re-visit some time down the line
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233 --TODO: considering sending the rspauth in a success node for saving one roundtrip; allowed according to http://tools.ietf.org/html/draft-saintandre-rfc3920bis-09#section-7.3.6
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diff changeset
234 return "challenge", serialize({rspauth = rspauth});
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235 else
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236 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
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237 end
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238 elseif self.step == 3 then
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239 if self.authenticated ~= nil then return "success"
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240 else return "failure", "malformed-request" end
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241 end
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242 end
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243
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244 function init(registerMechanism)
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245 registerMechanism("DIGEST-MD5", {"plain"}, digest);
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246 end
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247
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65482a852c4d util.sasl.*: Add 'sasl.' prefix to module names
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248 return _M;