prosody
443e388988e7
util/sasl/scram.lua

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util/sasl/scram.lua @ 2350:443e388988e7

modulemanager: Fire item-removed events on module unload.
author Waqas Hussain <waqas20@gmail.com>
date Thu, 10 Dec 2009 03:02:04 +0500
parent 2314:c2e1bde4d84d
child 2648:538dd5f1810a
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) 2008-2009 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 xor = require "bit".bxor
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19 local hmac_sha1 = require "util.hmac".sha1;
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20 local sha1 = require "util.hashes".sha1;
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21 local generate_uuid = require "util.uuid".generate;
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22 local saslprep = require "util.encodings".stringprep.saslprep;
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23 local log = require "util.logger".init("sasl");
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24 local t_concat = table.concat;
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25 local char = string.char;
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26 local byte = string.byte;
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27
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28 module "scram"
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29
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30 --=========================
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31 --SASL SCRAM-SHA-1 according to draft-ietf-sasl-scram-10
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32 local default_i = 4096
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33
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34 local function bp( b )
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35 local result = ""
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36 for i=1, b:len() do
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37 result = result.."\\"..b:byte(i)
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38 end
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39 return result
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40 end
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41
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42 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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43
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44 local result = {};
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45 local function binaryXOR( a, b )
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46 for i=1, #a do
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47 local x, y = byte(a, i), byte(b, i);
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48 local lowx, lowy = x % 16, y % 16;
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49 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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50 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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51 local r = hir * 16 + lowr;
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52 result[i] = char(r)
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53 end
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54 return t_concat(result);
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55 end
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56
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57 -- hash algorithm independent Hi(PBKDF2) implementation
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58 local function Hi(hmac, str, salt, i)
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59 local Ust = hmac(str, salt.."\0\0\0\1");
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60 local res = Ust;
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61 for n=1,i-1 do
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62 local Und = hmac(str, Ust)
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63 res = binaryXOR(res, Und)
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64 Ust = Und
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65 end
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66 return res
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67 end
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68
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69 local function validate_username(username)
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70 -- check for forbidden char sequences
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71 for eq in username:gmatch("=(.?.?)") do
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72 if eq ~= "2D" and eq ~= "3D" then
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73 return false
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74 end
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75 end
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76
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77 -- replace =2D with , and =3D with =
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78 username = username:gsub("=2D", ",");
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79 username = username:gsub("=3D", "=");
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80
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81 -- apply SASLprep
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82 username = saslprep(username);
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83 return username;
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84 end
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85
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86 local function scram_sha_1(self, message)
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87 if not self.state then self["state"] = {} end
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88
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89 if not self.state.name then
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90 -- we are processing client_first_message
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91 local client_first_message = message;
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92 self.state["client_first_message"] = client_first_message;
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93 self.state["name"] = client_first_message:match("n=(.+),r=")
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94 self.state["clientnonce"] = client_first_message:match("r=([^,]+)")
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95
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96 if not self.state.name or not self.state.clientnonce then
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97 return "failure", "malformed-request";
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98 end
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99
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100 self.state.name = validate_username(self.state.name);
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101 if not self.state.name then
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102 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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103 return "failure", "malformed-request", "Invalid username.";
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104 end
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105
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106 self.state["servernonce"] = generate_uuid();
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107 self.state["salt"] = generate_uuid();
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108
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109 local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..default_i;
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110 self.state["server_first_message"] = server_first_message;
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111 return "challenge", server_first_message
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112 else
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113 if type(message) ~= "string" then return "failure", "malformed-request" end
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114 -- we are processing client_final_message
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115 local client_final_message = message;
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116
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117 self.state["proof"] = client_final_message:match("p=(.+)");
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118 self.state["nonce"] = client_final_message:match("r=(.+),p=");
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119 self.state["channelbinding"] = client_final_message:match("c=(.+),r=");
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120 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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121 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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122 end
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123
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124 local password, state;
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125 if self.profile.plain then
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126 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 password = saslprep(password);
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130 if not password then
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131 log("debug", "Password violates SASLprep.");
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132 return "failure", "not-authorized", "Invalid password."
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133 end
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134 end
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135
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136 local SaltedPassword = Hi(hmac_sha1, password, self.state.salt, default_i)
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137 local ClientKey = hmac_sha1(SaltedPassword, "Client Key")
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138 local ServerKey = hmac_sha1(SaltedPassword, "Server Key")
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139 local StoredKey = sha1(ClientKey)
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140 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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141 local ClientSignature = hmac_sha1(StoredKey, AuthMessage)
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142 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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143 local ServerSignature = hmac_sha1(ServerKey, AuthMessage)
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144
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145 if base64.encode(ClientProof) == self.state.proof then
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146 local server_final_message = "v="..base64.encode(ServerSignature);
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147 self["username"] = self.state.name;
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148 return "success", server_final_message;
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149 else
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150 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
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151 end
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152 end
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153 end
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154
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155 function init(registerMechanism)
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156 registerMechanism("SCRAM-SHA-1", {"plain"}, scram_sha_1);
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157 end
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158
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159 return _M;