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util/sasl/scram.lua

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util/sasl/scram.lua @ 3205:2dcd826bbbc6

mod_auth_internal_hashed: Store StoredKey and ServerKey instead of salted hashed password.
author Tobias Markmann <tm@ayena.de>
date Tue, 08 Jun 2010 10:47:55 +0200
parent 3196:d35b181a895a
child 3206:ff1d3f751da1
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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 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 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 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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parents: 3094
diff changeset
114 local function scram_hash(self, message)
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parents: 3094
diff changeset
115 if not self.state then self["state"] = {} end
2194
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Tobias Markmann <tm@ayena.de>
parents:
diff changeset
116
3106
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parents: 3104
diff changeset
117 if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
3096
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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;
3099
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121
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122 -- TODO: fail if authzid is provided, since we don't support them yet
3096
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diff changeset
123 self.state["client_first_message"] = client_first_message;
3103
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Tobias Markmann <tm@ayena.de>
parents: 3102
diff changeset
124 self.state["gs2_cbind_flag"], self.state["authzid"], self.state["name"], self.state["clientnonce"]
87cf90ca8923 util.sasl.scram: Split up long line.
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parents: 3102
diff changeset
125 = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
3100
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Tobias Markmann <tm@ayena.de>
parents: 3099
diff changeset
126
3099
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127 -- we don't do any channel binding yet
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Tobias Markmann <tm@ayena.de>
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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
3099
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133 return "failure", "malformed-request", "Channel binding isn't support at this time.";
3096
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diff changeset
134 end
2199
08a6b91bfe7b SASLprep usernames and passwords.
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diff changeset
135
3096
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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
2196
614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
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diff changeset
141
3096
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parents: 3094
diff changeset
142 self.state["servernonce"] = generate_uuid();
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143
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144 -- retreive credentials
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parents: 3094
diff changeset
145 if self.profile.plain then
3098
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Waqas Hussain <waqas20@gmail.com>
parents: 3097
diff changeset
146 local password, state = self.profile.plain(self.state.name, self.realm)
3096
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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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diff changeset
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
3104
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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;
3104
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158
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diff changeset
159 local succ = false;
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diff changeset
160 succ, self.state.salted_password = saltedPasswordSHA1(password, self.state.salt, default_i, self.state.iteration_count);
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161 if not succ then
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diff changeset
162 log("error", "Generating salted password failed. Reason: %s", self.state.salted_password);
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Tobias Markmann <tm@ayena.de>
parents: 3103
diff changeset
163 return "failure", "temporary-auth-failure";
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parents: 3103
diff changeset
164 end
3122
579f17b9f948 util.sasl.*: Adjusting authentication provider names. All '-' replaced with '_'
Tobias Markmann <tm@ayena.de>
parents: 3118
diff changeset
165 elseif self.profile["scram_"..hashprep(hash_name)] then
3123
0f21abc745ef util.sasl.scram: Fix remaining - in profile name
Matthew Wild <mwild1@gmail.com>
parents: 3122
diff changeset
166 local salted_password, iteration_count, salt, state = self.profile["scram_"..hashprep(hash_name)](self.state.name, self.realm);
3096
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diff changeset
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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parents: 3094
diff changeset
170 self.state.salted_password = salted_password;
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171 self.state.iteration_count = iteration_count;
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172 self.state.salt = salt
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diff changeset
173 end
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diff changeset
174
3096
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175 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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176 self.state["server_first_message"] = server_first_message;
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177 return "challenge", server_first_message
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178 else
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179 -- we are processing client_final_message
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180 local client_final_message = message;
3099
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181
3102
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Tobias Markmann <tm@ayena.de>
parents: 3101
diff changeset
182 self.state["channelbinding"], self.state["nonce"], self.state["proof"] = client_final_message:match("^c=(.*),r=(.*),.*p=(.*)");
3099
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183
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184 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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185 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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186 end
3099
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diff changeset
187
3101
9e4439378cf8 util.sasl.scram: Fix in nonce check of client-final-message.
Tobias Markmann <tm@ayena.de>
parents: 3100
diff changeset
188 if self.state.nonce ~= self.state.clientnonce..self.state.servernonce then
9e4439378cf8 util.sasl.scram: Fix in nonce check of client-final-message.
Tobias Markmann <tm@ayena.de>
parents: 3100
diff changeset
189 return "failure", "malformed-request", "Wrong nonce in client-final-message.";
3099
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parents: 3098
diff changeset
190 end
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191
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192 local SaltedPassword = self.state.salted_password;
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193 local ClientKey = HMAC_f(SaltedPassword, "Client Key")
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194 local ServerKey = HMAC_f(SaltedPassword, "Server Key")
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195 local StoredKey = H_f(ClientKey)
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diff changeset
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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diff changeset
198 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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diff changeset
199 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
3099
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parents: 3098
diff changeset
200
3096
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diff changeset
201 if base64.encode(ClientProof) == self.state.proof 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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diff changeset
206 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
207 end
2196
614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
Tobias Markmann <tm@ayena.de>
parents: 2194
diff changeset
208 end
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
209 end
3096
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diff changeset
210 return scram_hash;
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
211 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
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212
41d42d253a1d Initial commit of SCRAM SASL mechanism.
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parents:
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213 function init(registerMechanism)
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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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214 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
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579f17b9f948 util.sasl.*: Adjusting authentication provider names. All '-' replaced with '_'
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parents: 3118
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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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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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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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parents: 3098
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217
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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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218 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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219 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
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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.
Tobias Markmann <tm@ayena.de>
parents: 3106
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221 return _M;