prosody
87cf90ca8923
util/sasl/scram.lua

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util/sasl/scram.lua @ 3103:87cf90ca8923

util.sasl.scram: Split up long line.
author Tobias Markmann <tm@ayena.de>
date Sat, 22 May 2010 14:58:24 +0200
parent 3102:5cd408e36359
child 3104:32150b4a8603
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"]
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106 = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
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107
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108 -- we don't do any channel binding yet
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109 if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
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110 return "failure", "malformed-request";
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111 end
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112
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113 if not self.state.name or not self.state.clientnonce then
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114 return "failure", "malformed-request", "Channel binding isn't support at this time.";
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115 end
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116
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117 self.state.name = validate_username(self.state.name);
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118 if not self.state.name then
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119 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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120 return "failure", "malformed-request", "Invalid username.";
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121 end
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122
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123 self.state["servernonce"] = generate_uuid();
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124
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125 -- retreive credentials
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126 if self.profile.plain then
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127 local password, state = self.profile.plain(self.state.name, self.realm)
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128 if state == nil then return "failure", "not-authorized"
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129 elseif state == false then return "failure", "account-disabled" end
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130
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131 password = saslprep(password);
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132 if not password then
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133 log("debug", "Password violates SASLprep.");
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134 return "failure", "not-authorized", "Invalid password."
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135 end
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136 self.state.salt = generate_uuid();
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137 self.state.iteration_count = default_i;
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138 self.state.salted_password = Hi(HMAC_f, password, self.state.salt, default_i);
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139 elseif self.profile["scram_"..hash_name] then
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140 local salted_password, iteration_count, salt, state = self.profile["scram-"..hash_name](self.state.name, self.realm);
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141 if state == nil then return "failure", "not-authorized"
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142 elseif state == false then return "failure", "account-disabled" end
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143
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144 self.state.salted_password = salted_password;
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145 self.state.iteration_count = iteration_count;
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146 self.state.salt = salt
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147 end
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148
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149 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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150 self.state["server_first_message"] = server_first_message;
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151 return "challenge", server_first_message
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152 else
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153 if type(message) ~= "string" then return "failure", "malformed-request" end
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154 -- we are processing client_final_message
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155 local client_final_message = message;
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156
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157 self.state["channelbinding"], self.state["nonce"], self.state["proof"] = client_final_message:match("^c=(.*),r=(.*),.*p=(.*)");
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158
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159 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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160 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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161 end
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162
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163 if self.state.nonce ~= self.state.clientnonce..self.state.servernonce then
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164 return "failure", "malformed-request", "Wrong nonce in client-final-message.";
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165 end
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166
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167 local SaltedPassword = self.state.salted_password;
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168 local ClientKey = HMAC_f(SaltedPassword, "Client Key")
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169 local ServerKey = HMAC_f(SaltedPassword, "Server Key")
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170 local StoredKey = H_f(ClientKey)
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171 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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172 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
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173 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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174 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
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175
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176 if base64.encode(ClientProof) == self.state.proof then
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177 local server_final_message = "v="..base64.encode(ServerSignature);
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178 self["username"] = self.state.name;
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179 return "success", server_final_message;
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180 else
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181 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
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182 end
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183 end
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184 end
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185 return scram_hash;
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186 end
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187
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188 function init(registerMechanism)
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189 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
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190 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hash_name:lower())}, scram_gen(hash_name:lower(), hash, hmac_hash));
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191 end
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192
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193 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
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194 end
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195
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196 return _M;