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66046a78e9c8
util/sasl/scram.lua

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util/sasl/scram.lua @ 3093:66046a78e9c8

util.sasl.plain: Adding plain_hashed authentication backend support.
author Tobias Markmann <tm@ayena.de>
date Sun, 28 Feb 2010 22:50:25 +0100
parent 2648:538dd5f1810a
child 2990:21933063dd9f
child 3094:5f625411b463
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 -- sasl.lua v0.4
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2 -- Copyright (C) 2008-2009 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 local default_i = 4096
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32
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33 local function bp( b )
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34 local result = ""
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35 for i=1, b:len() do
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36 result = result.."\\"..b:byte(i)
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37 end
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38 return result
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39 end
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40
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41 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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42
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43 local result = {};
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44 local function binaryXOR( a, b )
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45 for i=1, #a do
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46 local x, y = byte(a, i), byte(b, i);
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47 local lowx, lowy = x % 16, y % 16;
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48 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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49 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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50 local r = hir * 16 + lowr;
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51 result[i] = char(r)
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52 end
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53 return t_concat(result);
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54 end
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55
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56 -- hash algorithm independent Hi(PBKDF2) implementation
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57 local function Hi(hmac, str, salt, i)
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58 local Ust = hmac(str, salt.."\0\0\0\1");
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59 local res = Ust;
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60 for n=1,i-1 do
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61 local Und = hmac(str, Ust)
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62 res = binaryXOR(res, Und)
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63 Ust = Und
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64 end
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65 return res
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66 end
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67
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68 local function validate_username(username)
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69 -- check for forbidden char sequences
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70 for eq in username:gmatch("=(.?.?)") do
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71 if eq ~= "2D" and eq ~= "3D" then
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72 return false
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73 end
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74 end
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75
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76 -- replace =2D with , and =3D with =
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77 username = username:gsub("=2D", ",");
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78 username = username:gsub("=3D", "=");
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79
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80 -- apply SASLprep
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81 username = saslprep(username);
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82 return username;
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83 end
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84
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85 local function scram_sha_1(self, message)
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86 if not self.state then self["state"] = {} end
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87
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88 if not self.state.name then
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89 -- we are processing client_first_message
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90 local client_first_message = message;
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91 self.state["client_first_message"] = client_first_message;
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92 self.state["name"] = client_first_message:match("n=(.+),r=")
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93 self.state["clientnonce"] = client_first_message:match("r=([^,]+)")
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94
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95 if not self.state.name or not self.state.clientnonce then
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96 return "failure", "malformed-request";
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97 end
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98
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99 self.state.name = validate_username(self.state.name);
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100 if not self.state.name then
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101 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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102 return "failure", "malformed-request", "Invalid username.";
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103 end
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104
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105 self.state["servernonce"] = generate_uuid();
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106 self.state["salt"] = generate_uuid();
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107
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108 local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..default_i;
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109 self.state["server_first_message"] = server_first_message;
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110 return "challenge", server_first_message
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111 else
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112 if type(message) ~= "string" then return "failure", "malformed-request" end
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113 -- we are processing client_final_message
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114 local client_final_message = message;
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115
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116 self.state["proof"] = client_final_message:match("p=(.+)");
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117 self.state["nonce"] = client_final_message:match("r=(.+),p=");
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118 self.state["channelbinding"] = client_final_message:match("c=(.+),r=");
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119 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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120 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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121 end
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122
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123 local password, state;
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124 if self.profile.plain then
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125 password, state = self.profile.plain(self.state.name, self.realm)
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126 if state == nil then return "failure", "not-authorized"
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127 elseif state == false then return "failure", "account-disabled" end
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128 password = saslprep(password);
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129 if not password then
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130 log("debug", "Password violates SASLprep.");
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131 return "failure", "not-authorized", "Invalid password."
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132 end
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133 end
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134
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135 local SaltedPassword = Hi(hmac_sha1, password, self.state.salt, default_i)
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136 local ClientKey = hmac_sha1(SaltedPassword, "Client Key")
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137 local ServerKey = hmac_sha1(SaltedPassword, "Server Key")
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138 local StoredKey = sha1(ClientKey)
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139 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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140 local ClientSignature = hmac_sha1(StoredKey, AuthMessage)
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141 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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142 local ServerSignature = hmac_sha1(ServerKey, AuthMessage)
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143
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144 if base64.encode(ClientProof) == self.state.proof then
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145 local server_final_message = "v="..base64.encode(ServerSignature);
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146 self["username"] = self.state.name;
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147 return "success", server_final_message;
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148 else
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149 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
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150 end
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151 end
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152 end
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153
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154 function init(registerMechanism)
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155 registerMechanism("SCRAM-SHA-1", {"plain"}, scram_sha_1);
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156 end
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157
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158 return _M;