prosody
8e842989ced2
util/sasl/scram.lua

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util/sasl/scram.lua @ 3080:8e842989ced2

util.sasl.plain: Typo.
author Tobias Markmann <tm@ayena.de>
date Sat, 22 May 2010 20:34:32 +0200
parent 3079:e144a4989e70
child 3081:4ee34d07e042
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) 2008-2010 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 function saltedPasswordSHA1(password, salt, iteration_count)
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96 local salted_password
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97 if type(password) ~= "string" and type(salt) ~= "string" and type(iteration_count) ~= "number" then
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98 return false, "inappropriate argument types"
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99 end
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100 if iteration_count < 4096 then
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101 log("warning", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
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102 end
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103
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104 return true, Hi(hmac_sha1, password, salt, iteration_count);
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105 end
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106
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107 local function scram_gen(hash_name, H_f, HMAC_f)
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108 local function scram_hash(self, message)
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109 if not self.state then self["state"] = {} end
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110
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111 if not self.state.name then
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112 -- we are processing client_first_message
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113 local client_first_message = message;
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114
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115 -- TODO: fail if authzid is provided, since we don't support them yet
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116 self.state["client_first_message"] = client_first_message;
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117 self.state["gs2_cbind_flag"], self.state["authzid"], self.state["name"], self.state["clientnonce"]
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118 = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
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119
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120 -- we don't do any channel binding yet
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121 if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
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122 return "failure", "malformed-request";
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123 end
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124
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125 if not self.state.name or not self.state.clientnonce then
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126 return "failure", "malformed-request", "Channel binding isn't support at this time.";
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127 end
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128
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129 self.state.name = validate_username(self.state.name);
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130 if not self.state.name then
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131 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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132 return "failure", "malformed-request", "Invalid username.";
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133 end
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134
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135 self.state["servernonce"] = generate_uuid();
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136
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137 -- retreive credentials
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138 if self.profile.plain then
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139 local password, state = self.profile.plain(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 password = saslprep(password);
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144 if not password then
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145 log("debug", "Password violates SASLprep.");
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146 return "failure", "not-authorized", "Invalid password."
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147 end
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148
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149 self.state.salt = generate_uuid();
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150 self.state.iteration_count = default_i;
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151
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152 local succ = false;
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153 succ, self.state.salted_password = saltedPasswordSHA1(password, self.state.salt, default_i, self.state.iteration_count);
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154 if not succ then
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155 log("error", "Generating salted password failed. Reason: %s", self.state.salted_password);
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156 return "failure", "temporary-auth-failure";
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157 end
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158 elseif self.profile["scram_"..hash_name] then
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159 local salted_password, iteration_count, salt, state = self.profile["scram-"..hash_name](self.state.name, self.realm);
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160 if state == nil then return "failure", "not-authorized"
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161 elseif state == false then return "failure", "account-disabled" end
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162
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163 self.state.salted_password = salted_password;
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164 self.state.iteration_count = iteration_count;
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165 self.state.salt = salt
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166 end
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167
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168 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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169 self.state["server_first_message"] = server_first_message;
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170 return "challenge", server_first_message
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171 else
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172 if type(message) ~= "string" then return "failure", "malformed-request" end
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173 -- we are processing client_final_message
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174 local client_final_message = message;
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175
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176 self.state["channelbinding"], self.state["nonce"], self.state["proof"] = client_final_message:match("^c=(.*),r=(.*),.*p=(.*)");
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177
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178 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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179 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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180 end
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181
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182 if self.state.nonce ~= self.state.clientnonce..self.state.servernonce then
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183 return "failure", "malformed-request", "Wrong nonce in client-final-message.";
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184 end
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185
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186 local SaltedPassword = self.state.salted_password;
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187 local ClientKey = HMAC_f(SaltedPassword, "Client Key")
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188 local ServerKey = HMAC_f(SaltedPassword, "Server Key")
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189 local StoredKey = H_f(ClientKey)
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190 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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191 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
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192 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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193 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
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194
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195 if base64.encode(ClientProof) == self.state.proof then
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196 local server_final_message = "v="..base64.encode(ServerSignature);
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197 self["username"] = self.state.name;
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198 return "success", server_final_message;
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199 else
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200 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
2199
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201 end
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202 end
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203 end
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204 return scram_hash;
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205 end
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206
41d42d253a1d Initial commit of SCRAM SASL mechanism.
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207 function init(registerMechanism)
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208 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
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209 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hash_name:lower())}, scram_gen(hash_name:lower(), hash, hmac_hash));
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210 end
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211
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21933063dd9f util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 2648
diff changeset
212 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
213 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
214
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
215 return _M;