prosody
b0515ed4d9d7
util/sasl/scram.lua

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util/sasl/scram.lua @ 2996:b0515ed4d9d7

util.sasl: 2009 -> 2010 in copyright header.
author Tobias Markmann <tm@ayena.de>
date Fri, 12 Mar 2010 18:37:51 +0100
parent 2995:175002d404b8
child 3016:b6046df19898
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 self.state["client_first_message"] = client_first_message;
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103 self.state["name"] = client_first_message:match("n=(.+),r=")
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104 self.state["clientnonce"] = client_first_message:match("r=([^,]+)")
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105
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106 if not self.state.name or not self.state.clientnonce then
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107 return "failure", "malformed-request";
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108 end
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109
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110 self.state.name = validate_username(self.state.name);
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111 if not self.state.name then
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112 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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113 return "failure", "malformed-request", "Invalid username.";
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114 end
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115
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116 self.state["servernonce"] = generate_uuid();
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117
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118 -- retreive credentials
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119 if self.profile.plain then
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120 password, state = self.profile.plain(self.state.name, self.realm)
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121 if state == nil then return "failure", "not-authorized"
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122 elseif state == false then return "failure", "account-disabled" end
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123
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124 password = saslprep(password);
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125 if not password then
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126 log("debug", "Password violates SASLprep.");
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127 return "failure", "not-authorized", "Invalid password."
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128 end
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129 self.state.salt = generate_uuid();
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130 self.state.iteration_count = default_i;
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131 self.state.salted_password = Hi(HMAC_f, password, self.state.salt, default_i);
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132 elseif self.profile["scram_"..hash_name] then
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133 salted_password, iteration_count, salt, state = self.profile["scram-"..hash_name](self.state.name, self.realm);
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134 if state == nil then return "failure", "not-authorized"
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135 elseif state == false then return "failure", "account-disabled" end
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136
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137 self.state.salted_password = salted_password;
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138 self.state.iteration_count = iteration_count;
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139 self.state.salt = salt
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140 end
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141
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142 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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143 self.state["server_first_message"] = server_first_message;
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144 return "challenge", server_first_message
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145 else
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146 if type(message) ~= "string" then return "failure", "malformed-request" end
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147 -- we are processing client_final_message
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148 local client_final_message = message;
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149
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150 self.state["proof"] = client_final_message:match("p=(.+)");
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151 self.state["nonce"] = client_final_message:match("r=(.+),p=");
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152 self.state["channelbinding"] = client_final_message:match("c=(.+),r=");
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153 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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154 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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155 end
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156
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157 local SaltedPassword = self.state.salted_password;
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158 local ClientKey = HMAC_f(SaltedPassword, "Client Key")
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159 local ServerKey = HMAC_f(SaltedPassword, "Server Key")
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160 local StoredKey = H_f(ClientKey)
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161 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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162 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
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163 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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164 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
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165
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166 if base64.encode(ClientProof) == self.state.proof then
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167 local server_final_message = "v="..base64.encode(ServerSignature);
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168 self["username"] = self.state.name;
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169 return "success", server_final_message;
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170 else
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171 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
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172 end
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173 end
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174 end
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175 return scram_hash;
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176 end
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177
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178 function init(registerMechanism)
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179 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
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180 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hash_name:lower())}, scram_gen(hash_name:lower(), hash, hmac_hash));
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181 end
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182
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183 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
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184 end
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185
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186 return _M;