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86fab046813f
util/sasl/scram.lua

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util/sasl/scram.lua @ 5317:86fab046813f

mod_pubsub: Broadcast items correctly on new subscriptions
author Kim Alvefur <zash@zash.se>
date Mon, 28 Jan 2013 01:06:05 +0100
parent 5301:6279caf921f1
child 5537:15464633d8fb
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) 2008-2010 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 nodeprep = require "util.encodings".stringprep.nodeprep;
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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 "sasl.scram"
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29
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30 --=========================
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31 --SASL SCRAM-SHA-1 according to RFC 5802
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32
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33 --[[
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34 Supported Authentication Backends
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35
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36 scram_{MECH}:
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37 -- MECH being a standard hash name (like those at IANA's hash registry) with '-' replaced with '_'
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38 function(username, realm)
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39 return stored_key, server_key, iteration_count, salt, state;
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40 end
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41 ]]
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42
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43 local default_i = 4096
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44
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45 local function bp( b )
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46 local result = ""
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47 for i=1, b:len() do
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48 result = result.."\\"..b:byte(i)
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49 end
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50 return result
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51 end
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52
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53 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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54
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55 local result = {};
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56 local function binaryXOR( a, b )
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57 for i=1, #a do
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58 local x, y = byte(a, i), byte(b, i);
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59 local lowx, lowy = x % 16, y % 16;
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60 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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61 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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62 local r = hir * 16 + lowr;
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63 result[i] = char(r)
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64 end
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65 return t_concat(result);
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66 end
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67
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68 -- hash algorithm independent Hi(PBKDF2) implementation
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69 function Hi(hmac, str, salt, i)
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70 local Ust = hmac(str, salt.."\0\0\0\1");
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71 local res = Ust;
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72 for n=1,i-1 do
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73 local Und = hmac(str, Ust)
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74 res = binaryXOR(res, Und)
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75 Ust = Und
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76 end
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77 return res
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78 end
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79
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80 local function validate_username(username, _nodeprep)
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81 -- check for forbidden char sequences
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82 for eq in username:gmatch("=(.?.?)") do
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83 if eq ~= "2C" and eq ~= "3D" then
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84 return false
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85 end
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86 end
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87
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88 -- replace =2C with , and =3D with =
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89 username = username:gsub("=2C", ",");
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90 username = username:gsub("=3D", "=");
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91
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92 -- apply SASLprep
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93 username = saslprep(username);
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94
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95 if username and _nodeprep ~= false then
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96 username = (_nodeprep or nodeprep)(username);
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97 end
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98
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99 return username and #username>0 and username;
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100 end
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101
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102 local function hashprep(hashname)
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103 return hashname:lower():gsub("-", "_");
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104 end
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105
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106 function getAuthenticationDatabaseSHA1(password, salt, iteration_count)
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107 if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
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108 return false, "inappropriate argument types"
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109 end
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110 if iteration_count < 4096 then
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111 log("warn", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
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112 end
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113 local salted_password = Hi(hmac_sha1, password, salt, iteration_count);
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114 local stored_key = sha1(hmac_sha1(salted_password, "Client Key"))
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115 local server_key = hmac_sha1(salted_password, "Server Key");
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116 return true, stored_key, server_key
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117 end
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118
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119 local function scram_gen(hash_name, H_f, HMAC_f)
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120 local function scram_hash(self, message)
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121 if not self.state then self["state"] = {} end
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122
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123 if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
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124 if not self.state.name then
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125 -- we are processing client_first_message
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126 local client_first_message = message;
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127
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128 -- TODO: fail if authzid is provided, since we don't support them yet
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129 self.state["client_first_message"] = client_first_message;
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130 self.state["gs2_cbind_flag"], self.state["authzid"], self.state["name"], self.state["clientnonce"]
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131 = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
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132
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133 -- we don't do any channel binding yet
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134 if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
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135 return "failure", "malformed-request";
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136 end
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137
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138 if not self.state.name or not self.state.clientnonce then
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139 return "failure", "malformed-request", "Channel binding isn't support at this time.";
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140 end
2199
08a6b91bfe7b SASLprep usernames and passwords.
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141
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142 self.state.name = validate_username(self.state.name, self.profile.nodeprep);
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143 if not self.state.name then
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144 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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145 return "failure", "malformed-request", "Invalid username.";
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146 end
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147
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148 self.state["servernonce"] = generate_uuid();
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149
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150 -- retreive credentials
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151 if self.profile.plain then
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152 local password, state = self.profile.plain(self, self.state.name, self.realm)
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153 if state == nil then return "failure", "not-authorized"
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154 elseif state == false then return "failure", "account-disabled" end
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155
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156 password = saslprep(password);
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157 if not password then
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158 log("debug", "Password violates SASLprep.");
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159 return "failure", "not-authorized", "Invalid password."
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160 end
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161
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162 self.state.salt = generate_uuid();
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163 self.state.iteration_count = default_i;
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164
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165 local succ = false;
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166 succ, self.state.stored_key, self.state.server_key = getAuthenticationDatabaseSHA1(password, self.state.salt, default_i, self.state.iteration_count);
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167 if not succ then
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168 log("error", "Generating authentication database failed. Reason: %s", self.state.stored_key);
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169 return "failure", "temporary-auth-failure";
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170 end
3122
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diff changeset
171 elseif self.profile["scram_"..hashprep(hash_name)] then
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diff changeset
172 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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173 if state == nil then return "failure", "not-authorized"
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174 elseif state == false then return "failure", "account-disabled" end
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175
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176 self.state.stored_key = stored_key;
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177 self.state.server_key = server_key;
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178 self.state.iteration_count = iteration_count;
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179 self.state.salt = salt
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180 end
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181
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182 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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183 self.state["server_first_message"] = server_first_message;
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184 return "challenge", server_first_message
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185 else
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186 -- we are processing client_final_message
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187 local client_final_message = message;
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188
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189 self.state["channelbinding"], self.state["nonce"], self.state["proof"] = client_final_message:match("^c=(.*),r=(.*),.*p=(.*)");
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190
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191 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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192 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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193 end
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194
3101
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Tobias Markmann <tm@ayena.de>
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diff changeset
195 if self.state.nonce ~= self.state.clientnonce..self.state.servernonce then
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diff changeset
196 return "failure", "malformed-request", "Wrong nonce in client-final-message.";
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197 end
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198
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199 local ServerKey = self.state.server_key;
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200 local StoredKey = self.state.stored_key;
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diff changeset
201
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202 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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203 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
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204 local ClientKey = binaryXOR(ClientSignature, base64.decode(self.state.proof))
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205 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
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206
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diff changeset
207 if StoredKey == H_f(ClientKey) then
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208 local server_final_message = "v="..base64.encode(ServerSignature);
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209 self["username"] = self.state.name;
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210 return "success", server_final_message;
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211 else
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212 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
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213 end
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614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
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214 end
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215 end
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216 return scram_hash;
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217 end
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218
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219 function init(registerMechanism)
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220 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
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221 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hashprep(hash_name))}, scram_gen(hash_name:lower(), hash, hmac_hash));
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222 end
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223
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224 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
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225 end
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226
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227 return _M;