prosody
62089c9c142d
util/sasl/scram.lua

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util/sasl/scram.lua @ 5538:62089c9c142d

util.hashes, util.sasl.scram: Implement SCRAM-SHA1's Hi in C
author Florian Zeitz <florob@babelmonkeys.de>
date Sun, 28 Apr 2013 02:28:42 +0200
parent 5537:15464633d8fb
child 5776:bd0ff8ae98a8
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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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.hashes".hmac_sha1;
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19 local sha1 = require "util.hashes".sha1;
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20 local Hi = require "util.hashes".scram_Hi_sha1;
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21 local generate_uuid = require "util.uuid".generate;
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22 local saslprep = require "util.encodings".stringprep.saslprep;
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23 local nodeprep = require "util.encodings".stringprep.nodeprep;
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24 local log = require "util.logger".init("sasl");
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25 local t_concat = table.concat;
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26 local char = string.char;
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27 local byte = string.byte;
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28
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29 module "sasl.scram"
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31 --=========================
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32 --SASL SCRAM-SHA-1 according to RFC 5802
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33
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34 --[[
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35 Supported Authentication Backends
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36
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37 scram_{MECH}:
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38 -- MECH being a standard hash name (like those at IANA's hash registry) with '-' replaced with '_'
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39 function(username, realm)
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40 return stored_key, server_key, iteration_count, salt, state;
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41 end
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42 ]]
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43
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44 local default_i = 4096
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45
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46 local function bp( b )
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47 local result = ""
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48 for i=1, b:len() do
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49 result = result.."\\"..b:byte(i)
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50 end
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51 return result
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52 end
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53
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54 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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55
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56 local result = {};
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57 local function binaryXOR( a, b )
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58 for i=1, #a do
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59 local x, y = byte(a, i), byte(b, i);
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60 local lowx, lowy = x % 16, y % 16;
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61 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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62 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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63 local r = hir * 16 + lowr;
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64 result[i] = char(r)
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65 end
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66 return t_concat(result);
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67 end
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68
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69 local function validate_username(username, _nodeprep)
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70 -- check for forbidden char sequences
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71 for eq in username:gmatch("=(.?.?)") do
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72 if eq ~= "2C" and eq ~= "3D" then
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73 return false
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74 end
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75 end
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76
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77 -- replace =2C with , and =3D with =
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78 username = username:gsub("=2C", ",");
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79 username = username:gsub("=3D", "=");
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80
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81 -- apply SASLprep
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82 username = saslprep(username);
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83
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84 if username and _nodeprep ~= false then
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85 username = (_nodeprep or nodeprep)(username);
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86 end
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87
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88 return username and #username>0 and username;
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89 end
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90
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91 local function hashprep(hashname)
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92 return hashname:lower():gsub("-", "_");
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93 end
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94
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95 function getAuthenticationDatabaseSHA1(password, salt, iteration_count)
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96 if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
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97 return false, "inappropriate argument types"
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98 end
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99 if iteration_count < 4096 then
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100 log("warn", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
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101 end
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102 local salted_password = Hi(password, salt, iteration_count);
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103 local stored_key = sha1(hmac_sha1(salted_password, "Client Key"))
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104 local server_key = hmac_sha1(salted_password, "Server Key");
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105 return true, stored_key, server_key
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106 end
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107
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108 local function scram_gen(hash_name, H_f, HMAC_f)
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109 local function scram_hash(self, message)
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110 if not self.state then self["state"] = {} end
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111
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112 if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
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113 if not self.state.name then
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114 -- we are processing client_first_message
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115 local client_first_message = message;
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116
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117 -- TODO: fail if authzid is provided, since we don't support them yet
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118 self.state["client_first_message"] = client_first_message;
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119 self.state["gs2_cbind_flag"], self.state["authzid"], self.state["name"], self.state["clientnonce"]
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120 = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
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121
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122 -- we don't do any channel binding yet
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123 if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
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124 return "failure", "malformed-request";
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125 end
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126
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127 if not self.state.name or not self.state.clientnonce then
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128 return "failure", "malformed-request", "Channel binding isn't support at this time.";
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129 end
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130
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131 self.state.name = validate_username(self.state.name, self.profile.nodeprep);
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132 if not self.state.name then
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133 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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134 return "failure", "malformed-request", "Invalid username.";
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135 end
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136
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137 self.state["servernonce"] = generate_uuid();
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138
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139 -- retreive credentials
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140 if self.profile.plain then
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141 local password, state = self.profile.plain(self, self.state.name, self.realm)
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142 if state == nil then return "failure", "not-authorized"
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143 elseif state == false then return "failure", "account-disabled" end
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144
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145 password = saslprep(password);
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146 if not password then
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147 log("debug", "Password violates SASLprep.");
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148 return "failure", "not-authorized", "Invalid password."
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149 end
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150
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151 self.state.salt = generate_uuid();
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152 self.state.iteration_count = default_i;
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153
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154 local succ = false;
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155 succ, self.state.stored_key, self.state.server_key = getAuthenticationDatabaseSHA1(password, self.state.salt, default_i, self.state.iteration_count);
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156 if not succ then
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157 log("error", "Generating authentication database failed. Reason: %s", self.state.stored_key);
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158 return "failure", "temporary-auth-failure";
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159 end
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160 elseif self.profile["scram_"..hashprep(hash_name)] then
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161 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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162 if state == nil then return "failure", "not-authorized"
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163 elseif state == false then return "failure", "account-disabled" end
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164
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165 self.state.stored_key = stored_key;
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166 self.state.server_key = server_key;
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167 self.state.iteration_count = iteration_count;
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168 self.state.salt = salt
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169 end
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170
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171 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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172 self.state["server_first_message"] = server_first_message;
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173 return "challenge", server_first_message
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174 else
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175 -- we are processing client_final_message
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176 local client_final_message = message;
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177
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178 self.state["channelbinding"], self.state["nonce"], self.state["proof"] = client_final_message:match("^c=(.*),r=(.*),.*p=(.*)");
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179
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180 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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181 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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182 end
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183
3101
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Tobias Markmann <tm@ayena.de>
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diff changeset
184 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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185 return "failure", "malformed-request", "Wrong nonce in client-final-message.";
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186 end
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187
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188 local ServerKey = self.state.server_key;
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189 local StoredKey = self.state.stored_key;
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190
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191 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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192 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
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193 local ClientKey = binaryXOR(ClientSignature, base64.decode(self.state.proof))
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194 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
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195
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196 if StoredKey == H_f(ClientKey) then
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197 local server_final_message = "v="..base64.encode(ServerSignature);
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198 self["username"] = self.state.name;
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199 return "success", server_final_message;
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200 else
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201 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
2199
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202 end
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203 end
2194
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204 end
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205 return scram_hash;
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206 end
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207
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208 function init(registerMechanism)
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209 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
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210 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hashprep(hash_name))}, scram_gen(hash_name:lower(), hash, hmac_hash));
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211 end
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212
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213 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
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214 end
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215
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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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216 return _M;