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util/sasl/scram.lua

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util/sasl/scram.lua @ 3121:27f895bac9c0

Merge trunk/Tobias->trunk
author Matthew Wild <mwild1@gmail.com>
date Mon, 24 May 2010 19:39:07 +0100
parent 3119:c1ac08fa2533
parent 3120:6f1b7260925c
child 3124:21e60658767d
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 -- MECH being a standard hash name (like those at IANA's hash registry) with '-' replaced with '_'
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37 function(username, realm)
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38 return salted_password, iteration_count, salt, state;
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39 end
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40 ]]
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41
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42 local default_i = 4096
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43
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44 local function bp( b )
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45 local result = ""
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46 for i=1, b:len() do
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47 result = result.."\\"..b:byte(i)
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48 end
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49 return result
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50 end
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51
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52 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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53
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54 local result = {};
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55 local function binaryXOR( a, b )
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56 for i=1, #a do
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57 local x, y = byte(a, i), byte(b, i);
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58 local lowx, lowy = x % 16, y % 16;
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59 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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60 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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61 local r = hir * 16 + lowr;
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62 result[i] = char(r)
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63 end
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64 return t_concat(result);
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65 end
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66
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67 -- hash algorithm independent Hi(PBKDF2) implementation
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68 local function Hi(hmac, str, salt, i)
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69 local Ust = hmac(str, salt.."\0\0\0\1");
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70 local res = Ust;
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71 for n=1,i-1 do
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72 local Und = hmac(str, Ust)
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73 res = binaryXOR(res, Und)
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74 Ust = Und
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75 end
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76 return res
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77 end
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78
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79 local function validate_username(username)
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80 -- check for forbidden char sequences
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81 for eq in username:gmatch("=(.?.?)") do
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82 if eq ~= "2D" and eq ~= "3D" then
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83 return false
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84 end
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85 end
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86
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87 -- replace =2D with , and =3D with =
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88 username = username:gsub("=2D", ",");
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89 username = username:gsub("=3D", "=");
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90
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91 -- apply SASLprep
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92 username = saslprep(username);
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93 return username;
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94 end
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95
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96 local function hashprep( hashname )
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97 local hash = hashname:lower()
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98 hash = hash:gsub("-", "_")
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99 return hash
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100 end
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101
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102 function saltedPasswordSHA1(password, salt, iteration_count)
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103 local salted_password
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104 if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
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105 return false, "inappropriate argument types"
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106 end
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107 if iteration_count < 4096 then
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108 log("warning", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
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109 end
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110
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111 return true, Hi(hmac_sha1, password, salt, iteration_count);
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112 end
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113
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114 local function scram_gen(hash_name, H_f, HMAC_f)
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115 local function scram_hash(self, message)
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116 if not self.state then self["state"] = {} end
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diff changeset
117
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diff changeset
118 if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
3096
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119 if not self.state.name then
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120 -- we are processing client_first_message
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121 local client_first_message = message;
3099
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122
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123 -- TODO: fail if authzid is provided, since we don't support them yet
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124 self.state["client_first_message"] = client_first_message;
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125 self.state["gs2_cbind_flag"], self.state["authzid"], self.state["name"], self.state["clientnonce"]
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126 = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
3100
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127
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128 -- we don't do any channel binding yet
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129 if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
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130 return "failure", "malformed-request";
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131 end
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132
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133 if not self.state.name or not self.state.clientnonce then
3099
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134 return "failure", "malformed-request", "Channel binding isn't support at this time.";
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135 end
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08a6b91bfe7b SASLprep usernames and passwords.
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136
3096
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137 self.state.name = validate_username(self.state.name);
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138 if not self.state.name then
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139 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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140 return "failure", "malformed-request", "Invalid username.";
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141 end
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614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
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142
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143 self.state["servernonce"] = generate_uuid();
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144
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145 -- retreive credentials
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146 if self.profile.plain then
3098
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Waqas Hussain <waqas20@gmail.com>
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diff changeset
147 local password, state = self.profile.plain(self.state.name, self.realm)
3096
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148 if state == nil then return "failure", "not-authorized"
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149 elseif state == false then return "failure", "account-disabled" end
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150
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151 password = saslprep(password);
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152 if not password then
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153 log("debug", "Password violates SASLprep.");
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154 return "failure", "not-authorized", "Invalid password."
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155 end
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156
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157 self.state.salt = generate_uuid();
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158 self.state.iteration_count = default_i;
3104
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159
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diff changeset
160 local succ = false;
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161 succ, self.state.salted_password = saltedPasswordSHA1(password, self.state.salt, default_i, self.state.iteration_count);
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162 if not succ then
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diff changeset
163 log("error", "Generating salted password failed. Reason: %s", self.state.salted_password);
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164 return "failure", "temporary-auth-failure";
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165 end
3120
6f1b7260925c util.sasl.*: Adjusting authentication provider names. All '-' replaced with '_'
Tobias Markmann <tm@ayena.de>
parents: 3117
diff changeset
166 elseif self.profile["scram_"..hashprep(hash_name)] then
3098
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Waqas Hussain <waqas20@gmail.com>
parents: 3097
diff changeset
167 local salted_password, iteration_count, salt, state = self.profile["scram-"..hash_name](self.state.name, self.realm);
3096
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168 if state == nil then return "failure", "not-authorized"
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169 elseif state == false then return "failure", "account-disabled" end
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170
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171 self.state.salted_password = salted_password;
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172 self.state.iteration_count = iteration_count;
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173 self.state.salt = salt
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174 end
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175
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176 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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177 self.state["server_first_message"] = server_first_message;
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178 return "challenge", server_first_message
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179 else
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180 -- we are processing client_final_message
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181 local client_final_message = message;
3099
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182
3102
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Tobias Markmann <tm@ayena.de>
parents: 3101
diff changeset
183 self.state["channelbinding"], self.state["nonce"], self.state["proof"] = client_final_message:match("^c=(.*),r=(.*),.*p=(.*)");
3099
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184
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185 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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186 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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187 end
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188
3101
9e4439378cf8 util.sasl.scram: Fix in nonce check of client-final-message.
Tobias Markmann <tm@ayena.de>
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diff changeset
189 if self.state.nonce ~= self.state.clientnonce..self.state.servernonce then
9e4439378cf8 util.sasl.scram: Fix in nonce check of client-final-message.
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parents: 3100
diff changeset
190 return "failure", "malformed-request", "Wrong nonce in client-final-message.";
3099
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191 end
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192
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193 local SaltedPassword = self.state.salted_password;
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194 local ClientKey = HMAC_f(SaltedPassword, "Client Key")
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195 local ServerKey = HMAC_f(SaltedPassword, "Server Key")
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196 local StoredKey = H_f(ClientKey)
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197 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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198 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
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diff changeset
199 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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diff changeset
200 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
3099
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parents: 3098
diff changeset
201
3096
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202 if base64.encode(ClientProof) == self.state.proof then
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203 local server_final_message = "v="..base64.encode(ServerSignature);
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204 self["username"] = self.state.name;
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205 return "success", server_final_message;
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206 else
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207 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
2199
08a6b91bfe7b SASLprep usernames and passwords.
Tobias Markmann <tm@ayena.de>
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diff changeset
208 end
2196
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diff changeset
209 end
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
210 end
3096
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diff changeset
211 return scram_hash;
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
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diff changeset
212 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
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213
41d42d253a1d Initial commit of SCRAM SASL mechanism.
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parents:
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214 function init(registerMechanism)
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parents: 3094
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215 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
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6f1b7260925c util.sasl.*: Adjusting authentication provider names. All '-' replaced with '_'
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216 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hashprep(hash_name))}, scram_gen(hash_name:lower(), hash, hmac_hash));
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parents: 3094
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217 end
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2c4d06e7e3d3 util.sasl.scram: Check nonce in client final message. Check channel binding flag in client first message. Adding some TODOs on more strict parsing. (thanks Marc Santamaria)
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parents: 3098
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218
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e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
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parents: 3094
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219 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
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parents:
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220 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
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parents:
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221
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6d576a66ca63 util.sasl.scram: Adjusting authentication backend name to conform with the style already used by the plain module.
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parents: 3106
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222 return _M;