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c1ac08fa2533
util/sasl/scram.lua

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util/sasl/scram.lua @ 3119:c1ac08fa2533

Merge 0.7->trunk
author Matthew Wild <mwild1@gmail.com>
date Mon, 24 May 2010 16:52:12 +0100
parent 3117:f4e7ca2aa2f7
parent 3118:95ddd75ed3c5
child 3121:27f895bac9c0
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" or type(salt) ~= "string" or 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 type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
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112 if not self.state.name then
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113 -- we are processing client_first_message
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114 local client_first_message = message;
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115
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116 -- TODO: fail if authzid is provided, since we don't support them yet
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117 self.state["client_first_message"] = client_first_message;
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118 self.state["gs2_cbind_flag"], self.state["authzid"], self.state["name"], self.state["clientnonce"]
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119 = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
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120
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121 -- we don't do any channel binding yet
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122 if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
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123 return "failure", "malformed-request";
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124 end
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125
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126 if not self.state.name or not self.state.clientnonce then
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127 return "failure", "malformed-request", "Channel binding isn't support at this time.";
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128 end
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129
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130 self.state.name = validate_username(self.state.name);
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131 if not self.state.name then
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132 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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133 return "failure", "malformed-request", "Invalid username.";
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134 end
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135
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136 self.state["servernonce"] = generate_uuid();
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137
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138 -- retreive credentials
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139 if self.profile.plain then
3098
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140 local password, state = self.profile.plain(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 password = saslprep(password);
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145 if not password then
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146 log("debug", "Password violates SASLprep.");
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147 return "failure", "not-authorized", "Invalid password."
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148 end
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149
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150 self.state.salt = generate_uuid();
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151 self.state.iteration_count = default_i;
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152
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153 local succ = false;
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154 succ, self.state.salted_password = saltedPasswordSHA1(password, self.state.salt, default_i, self.state.iteration_count);
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155 if not succ then
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156 log("error", "Generating salted password failed. Reason: %s", self.state.salted_password);
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157 return "failure", "temporary-auth-failure";
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158 end
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159 elseif self.profile["scram_"..hash_name] then
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diff changeset
160 local salted_password, iteration_count, salt, state = self.profile["scram-"..hash_name](self.state.name, self.realm);
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161 if state == nil then return "failure", "not-authorized"
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162 elseif state == false then return "failure", "account-disabled" end
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163
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164 self.state.salted_password = salted_password;
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165 self.state.iteration_count = iteration_count;
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166 self.state.salt = salt
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167 end
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168
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169 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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170 self.state["server_first_message"] = server_first_message;
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171 return "challenge", server_first_message
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172 else
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173 -- we are processing client_final_message
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174 local client_final_message = message;
3099
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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
3101
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diff changeset
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)
3099
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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
08a6b91bfe7b SASLprep usernames and passwords.
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diff changeset
201 end
2196
614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
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diff changeset
202 end
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
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203 end
3096
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204 return scram_hash;
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
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205 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
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parents:
diff changeset
206
41d42d253a1d Initial commit of SCRAM SASL mechanism.
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parents:
diff changeset
207 function init(registerMechanism)
3096
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208 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
3098
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diff changeset
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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diff changeset
212 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
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41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
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213 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
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214
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6d576a66ca63 util.sasl.scram: Adjusting authentication backend name to conform with the style already used by the plain module.
Tobias Markmann <tm@ayena.de>
parents: 3106
diff changeset
215 return _M;