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util/sasl/scram.lua

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util/sasl/scram.lua @ 4204:edd7b0610c2c

util.sasl.scram: Fix bug in validate_username function. (Thanks Florob)
author Tobias Markmann <tm@ayena.de>
date Thu, 24 Feb 2011 18:56:19 +0100
parent 4113:65482a852c4d
child 4368:916834f22d1b
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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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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 "sasl.scram"
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28
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29 --=========================
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30 --SASL SCRAM-SHA-1 according to RFC 5802
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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 stored_key, server_key, 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 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 ~= "2C" 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 =2C with , and =3D with =
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88 username = username:gsub("=2C", ",");
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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 return hashname:lower():gsub("-", "_");
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98 end
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99
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100 function getAuthenticationDatabaseSHA1(password, salt, iteration_count)
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101 if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
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102 return false, "inappropriate argument types"
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103 end
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104 if iteration_count < 4096 then
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105 log("warn", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
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106 end
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107 local salted_password = Hi(hmac_sha1, password, salt, iteration_count);
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108 local stored_key = sha1(hmac_sha1(salted_password, "Client Key"))
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109 local server_key = hmac_sha1(salted_password, "Server Key");
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110 return true, stored_key, server_key
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111 end
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112
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113 local function scram_gen(hash_name, H_f, HMAC_f)
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114 local function scram_hash(self, message)
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115 if not self.state then self["state"] = {} end
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116
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117 if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
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118 if not self.state.name then
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119 -- we are processing client_first_message
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120 local client_first_message = message;
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121
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122 -- TODO: fail if authzid is provided, since we don't support them yet
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123 self.state["client_first_message"] = client_first_message;
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124 self.state["gs2_cbind_flag"], self.state["authzid"], self.state["name"], self.state["clientnonce"]
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125 = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
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126
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127 -- we don't do any channel binding yet
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128 if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
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129 return "failure", "malformed-request";
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130 end
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131
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132 if not self.state.name or not self.state.clientnonce then
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133 return "failure", "malformed-request", "Channel binding isn't support at this time.";
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134 end
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135
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136 self.state.name = validate_username(self.state.name);
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137 if not self.state.name then
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138 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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139 return "failure", "malformed-request", "Invalid username.";
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140 end
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141
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142 self.state["servernonce"] = generate_uuid();
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143
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144 -- retreive credentials
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145 if self.profile.plain then
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146 local password, state = self.profile.plain(self, self.state.name, self.realm)
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147 if state == nil then return "failure", "not-authorized"
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148 elseif state == false then return "failure", "account-disabled" end
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149
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150 password = saslprep(password);
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151 if not password then
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152 log("debug", "Password violates SASLprep.");
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153 return "failure", "not-authorized", "Invalid password."
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154 end
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155
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156 self.state.salt = generate_uuid();
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157 self.state.iteration_count = default_i;
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158
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159 local succ = false;
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160 succ, self.state.stored_key, self.state.server_key = getAuthenticationDatabaseSHA1(password, self.state.salt, default_i, self.state.iteration_count);
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161 if not succ then
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162 log("error", "Generating authentication database failed. Reason: %s", self.state.stored_key);
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163 return "failure", "temporary-auth-failure";
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164 end
3122
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165 elseif self.profile["scram_"..hashprep(hash_name)] then
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Waqas Hussain <waqas20@gmail.com>
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diff changeset
166 local stored_key, server_key, iteration_count, salt, state = self.profile["scram_"..hashprep(hash_name)](self, self.state.name, self.realm);
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167 if state == nil then return "failure", "not-authorized"
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168 elseif state == false then return "failure", "account-disabled" end
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169
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170 self.state.stored_key = stored_key;
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171 self.state.server_key = server_key;
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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;
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182
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183 self.state["channelbinding"], self.state["nonce"], self.state["proof"] = client_final_message:match("^c=(.*),r=(.*),.*p=(.*)");
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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
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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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diff changeset
190 return "failure", "malformed-request", "Wrong nonce in client-final-message.";
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191 end
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192
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193 local ServerKey = self.state.server_key;
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194 local StoredKey = self.state.stored_key;
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195
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196 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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197 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
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198 local ClientKey = binaryXOR(ClientSignature, base64.decode(self.state.proof))
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199 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
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200
3206
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diff changeset
201 if StoredKey == H_f(ClientKey) then
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202 local server_final_message = "v="..base64.encode(ServerSignature);
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203 self["username"] = self.state.name;
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204 return "success", server_final_message;
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205 else
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206 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
2199
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207 end
2196
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diff changeset
208 end
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
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209 end
3096
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210 return scram_hash;
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41d42d253a1d Initial commit of SCRAM SASL mechanism.
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211 end
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41d42d253a1d Initial commit of SCRAM SASL mechanism.
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213 function init(registerMechanism)
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214 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
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215 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hashprep(hash_name))}, scram_gen(hash_name:lower(), hash, hmac_hash));
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216 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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217
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218 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
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219 end
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220
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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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221 return _M;