prosody
6731dff05c99
util/sasl/scram.lua

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util/sasl/scram.lua @ 3100:6731dff05c99

util.sasl.scram: Parsing client-first-message in a more strict way. (thanks Marc Santamaria)
author Tobias Markmann <tm@ayena.de>
date Sat, 22 May 2010 13:58:15 +0200
parent 3099:2c4d06e7e3d3
child 3101:9e4439378cf8
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 s_match = string.match;
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15 local type = type
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16 local string = string
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17 local base64 = require "util.encodings".base64;
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18 local hmac_sha1 = require "util.hmac".sha1;
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19 local sha1 = require "util.hashes".sha1;
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20 local generate_uuid = require "util.uuid".generate;
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21 local saslprep = require "util.encodings".stringprep.saslprep;
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22 local log = require "util.logger".init("sasl");
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23 local t_concat = table.concat;
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24 local char = string.char;
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25 local byte = string.byte;
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26
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27 module "scram"
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28
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29 --=========================
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30 --SASL SCRAM-SHA-1 according to draft-ietf-sasl-scram-10
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31
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32 --[[
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33 Supported Authentication Backends
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34
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35 scram-{MECH}:
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36 function(username, realm)
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37 return salted_password, iteration_count, salt, state;
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38 end
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39 ]]
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40
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41 local default_i = 4096
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42
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43 local function bp( b )
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44 local result = ""
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45 for i=1, b:len() do
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46 result = result.."\\"..b:byte(i)
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47 end
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48 return result
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49 end
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50
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51 local xor_map = {0;1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;1;0;3;2;5;4;7;6;9;8;11;10;13;12;15;14;2;3;0;1;6;7;4;5;10;11;8;9;14;15;12;13;3;2;1;0;7;6;5;4;11;10;9;8;15;14;13;12;4;5;6;7;0;1;2;3;12;13;14;15;8;9;10;11;5;4;7;6;1;0;3;2;13;12;15;14;9;8;11;10;6;7;4;5;2;3;0;1;14;15;12;13;10;11;8;9;7;6;5;4;3;2;1;0;15;14;13;12;11;10;9;8;8;9;10;11;12;13;14;15;0;1;2;3;4;5;6;7;9;8;11;10;13;12;15;14;1;0;3;2;5;4;7;6;10;11;8;9;14;15;12;13;2;3;0;1;6;7;4;5;11;10;9;8;15;14;13;12;3;2;1;0;7;6;5;4;12;13;14;15;8;9;10;11;4;5;6;7;0;1;2;3;13;12;15;14;9;8;11;10;5;4;7;6;1;0;3;2;14;15;12;13;10;11;8;9;6;7;4;5;2;3;0;1;15;14;13;12;11;10;9;8;7;6;5;4;3;2;1;0;};
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52
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53 local result = {};
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54 local function binaryXOR( a, b )
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55 for i=1, #a do
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56 local x, y = byte(a, i), byte(b, i);
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57 local lowx, lowy = x % 16, y % 16;
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58 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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59 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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60 local r = hir * 16 + lowr;
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61 result[i] = char(r)
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62 end
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63 return t_concat(result);
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64 end
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65
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66 -- hash algorithm independent Hi(PBKDF2) implementation
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67 local function Hi(hmac, str, salt, i)
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68 local Ust = hmac(str, salt.."\0\0\0\1");
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69 local res = Ust;
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70 for n=1,i-1 do
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71 local Und = hmac(str, Ust)
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72 res = binaryXOR(res, Und)
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73 Ust = Und
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74 end
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75 return res
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76 end
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77
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78 local function validate_username(username)
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79 -- check for forbidden char sequences
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80 for eq in username:gmatch("=(.?.?)") do
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81 if eq ~= "2D" and eq ~= "3D" then
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82 return false
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83 end
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84 end
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85
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86 -- replace =2D with , and =3D with =
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87 username = username:gsub("=2D", ",");
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88 username = username:gsub("=3D", "=");
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89
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90 -- apply SASLprep
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91 username = saslprep(username);
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92 return username;
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93 end
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94
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95 local function scram_gen(hash_name, H_f, HMAC_f)
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96 local function scram_hash(self, message)
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97 if not self.state then self["state"] = {} end
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98
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99 if not self.state.name then
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100 -- we are processing client_first_message
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101 local client_first_message = message;
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102
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103 -- TODO: fail if authzid is provided, since we don't support them yet
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104 self.state["client_first_message"] = client_first_message;
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105 self.state["gs2_cbind_flag"], self.state["authzid"], self.state["name"], self.state["clientnonce"] = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
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106
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107 -- we don't do any channel binding yet
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108 if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
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109 return "failure", "malformed-request";
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110 end
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111
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112 if not self.state.name or not self.state.clientnonce then
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113 return "failure", "malformed-request", "Channel binding isn't support at this time.";
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114 end
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115
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116 self.state.name = validate_username(self.state.name);
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117 if not self.state.name then
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118 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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119 return "failure", "malformed-request", "Invalid username.";
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120 end
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121
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122 self.state["servernonce"] = generate_uuid();
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123
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124 -- retreive credentials
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125 if self.profile.plain then
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126 local password, state = self.profile.plain(self.state.name, self.realm)
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127 if state == nil then return "failure", "not-authorized"
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128 elseif state == false then return "failure", "account-disabled" end
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129
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130 password = saslprep(password);
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131 if not password then
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132 log("debug", "Password violates SASLprep.");
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133 return "failure", "not-authorized", "Invalid password."
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134 end
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135 self.state.salt = generate_uuid();
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136 self.state.iteration_count = default_i;
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137 self.state.salted_password = Hi(HMAC_f, password, self.state.salt, default_i);
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138 elseif self.profile["scram_"..hash_name] then
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139 local salted_password, iteration_count, salt, state = self.profile["scram-"..hash_name](self.state.name, self.realm);
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140 if state == nil then return "failure", "not-authorized"
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141 elseif state == false then return "failure", "account-disabled" end
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142
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143 self.state.salted_password = salted_password;
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144 self.state.iteration_count = iteration_count;
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145 self.state.salt = salt
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146 end
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147
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148 local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..self.state.iteration_count;
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149 self.state["server_first_message"] = server_first_message;
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150 return "challenge", server_first_message
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151 else
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152 if type(message) ~= "string" then return "failure", "malformed-request" end
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153 -- we are processing client_final_message
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154 local client_final_message = message;
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155
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156 -- TODO: more strict parsing of client_final_message
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157 self.state["proof"] = client_final_message:match("p=(.+)");
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158 self.state["nonce"] = client_final_message:match("r=(.+),p=");
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159 self.state["channelbinding"] = client_final_message:match("c=(.+),r=");
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160
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161 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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162 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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163 end
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164
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165 if self.state.nonce ~= self.state.servernonce then
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166 return "failure", "malformed-request", "Wrong nonce in client-second-message.";
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167 end
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168
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169 local SaltedPassword = self.state.salted_password;
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170 local ClientKey = HMAC_f(SaltedPassword, "Client Key")
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171 local ServerKey = HMAC_f(SaltedPassword, "Server Key")
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172 local StoredKey = H_f(ClientKey)
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173 local AuthMessage = "n=" .. s_match(self.state.client_first_message,"n=(.+)") .. "," .. self.state.server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+")
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174 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
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175 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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176 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
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177
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178 if base64.encode(ClientProof) == self.state.proof then
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179 local server_final_message = "v="..base64.encode(ServerSignature);
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180 self["username"] = self.state.name;
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181 return "success", server_final_message;
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182 else
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183 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
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184 end
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185 end
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186 end
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187 return scram_hash;
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188 end
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189
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190 function init(registerMechanism)
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191 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
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192 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hash_name:lower())}, scram_gen(hash_name:lower(), hash, hmac_hash));
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193 end
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194
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195 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
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196 end
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197
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198 return _M;