prosody
21e60658767d
util/sasl/scram.lua

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util/sasl/scram.lua @ 3124:21e60658767d

Merge 0.7->trunk
author Matthew Wild <mwild1@gmail.com>
date Mon, 24 May 2010 19:46:12 +0100
parent 3121:27f895bac9c0
parent 3123:0f21abc745ef
child 3154:104f05235cef
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 -- sasl.lua v0.4
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2 -- Copyright (C) 2008-2010 Tobias Markmann
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3 --
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4 -- All rights reserved.
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5 --
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6 -- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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7 --
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8 -- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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9 -- * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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10 -- * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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11 --
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12 -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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13
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14 local s_match = string.match;
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15 local type = type
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16 local string = string
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17 local base64 = require "util.encodings".base64;
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18 local hmac_sha1 = require "util.hmac".sha1;
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19 local sha1 = require "util.hashes".sha1;
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20 local generate_uuid = require "util.uuid".generate;
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21 local saslprep = require "util.encodings".stringprep.saslprep;
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22 local log = require "util.logger".init("sasl");
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23 local t_concat = table.concat;
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24 local char = string.char;
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25 local byte = string.byte;
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26
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27 module "scram"
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28
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29 --=========================
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30 --SASL SCRAM-SHA-1 according to draft-ietf-sasl-scram-10
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31
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32 --[[
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33 Supported Authentication Backends
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34
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35 scram_{MECH}:
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36 -- MECH being a standard hash name (like those at IANA's hash registry) with '-' replaced with '_'
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37 function(username, realm)
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38 return salted_password, iteration_count, salt, state;
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39 end
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40 ]]
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41
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42 local default_i = 4096
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43
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44 local function bp( b )
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45 local result = ""
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46 for i=1, b:len() do
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47 result = result.."\\"..b:byte(i)
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48 end
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49 return result
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50 end
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51
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52 local xor_map = {0;1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;1;0;3;2;5;4;7;6;9;8;11;10;13;12;15;14;2;3;0;1;6;7;4;5;10;11;8;9;14;15;12;13;3;2;1;0;7;6;5;4;11;10;9;8;15;14;13;12;4;5;6;7;0;1;2;3;12;13;14;15;8;9;10;11;5;4;7;6;1;0;3;2;13;12;15;14;9;8;11;10;6;7;4;5;2;3;0;1;14;15;12;13;10;11;8;9;7;6;5;4;3;2;1;0;15;14;13;12;11;10;9;8;8;9;10;11;12;13;14;15;0;1;2;3;4;5;6;7;9;8;11;10;13;12;15;14;1;0;3;2;5;4;7;6;10;11;8;9;14;15;12;13;2;3;0;1;6;7;4;5;11;10;9;8;15;14;13;12;3;2;1;0;7;6;5;4;12;13;14;15;8;9;10;11;4;5;6;7;0;1;2;3;13;12;15;14;9;8;11;10;5;4;7;6;1;0;3;2;14;15;12;13;10;11;8;9;6;7;4;5;2;3;0;1;15;14;13;12;11;10;9;8;7;6;5;4;3;2;1;0;};
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53
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54 local result = {};
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55 local function binaryXOR( a, b )
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56 for i=1, #a do
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57 local x, y = byte(a, i), byte(b, i);
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58 local lowx, lowy = x % 16, y % 16;
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59 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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60 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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61 local r = hir * 16 + lowr;
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62 result[i] = char(r)
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63 end
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64 return t_concat(result);
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65 end
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66
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67 -- hash algorithm independent Hi(PBKDF2) implementation
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68 local function Hi(hmac, str, salt, i)
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69 local Ust = hmac(str, salt.."\0\0\0\1");
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70 local res = Ust;
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71 for n=1,i-1 do
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72 local Und = hmac(str, Ust)
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73 res = binaryXOR(res, Und)
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74 Ust = Und
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75 end
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76 return res
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77 end
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78
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79 local function validate_username(username)
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80 -- check for forbidden char sequences
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81 for eq in username:gmatch("=(.?.?)") do
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82 if eq ~= "2D" and eq ~= "3D" then
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83 return false
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84 end
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85 end
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86
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87 -- replace =2D with , and =3D with =
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88 username = username:gsub("=2D", ",");
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89 username = username:gsub("=3D", "=");
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90
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91 -- apply SASLprep
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92 username = saslprep(username);
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93 return username;
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94 end
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95
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96 local function hashprep( hashname )
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97 local hash = hashname:lower()
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98 hash = hash:gsub("-", "_")
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99 return hash
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100 end
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101
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102 function saltedPasswordSHA1(password, salt, iteration_count)
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103 local salted_password
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104 if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
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105 return false, "inappropriate argument types"
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106 end
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107 if iteration_count < 4096 then
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108 log("warning", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
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109 end
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110
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111 return true, Hi(hmac_sha1, password, salt, iteration_count);
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112 end
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113
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114 local function scram_gen(hash_name, H_f, HMAC_f)
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Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
115 local function scram_hash(self, message)
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parents: 3094
diff changeset
116 if not self.state then self["state"] = {} end
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
117
3106
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parents: 3104
diff changeset
118 if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
3096
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diff changeset
119 if not self.state.name then
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120 -- we are processing client_first_message
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diff changeset
121 local client_first_message = message;
3099
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diff changeset
122
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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123 -- TODO: fail if authzid is provided, since we don't support them yet
3096
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diff changeset
124 self.state["client_first_message"] = client_first_message;
3103
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Tobias Markmann <tm@ayena.de>
parents: 3102
diff changeset
125 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
126 = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
3100
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Tobias Markmann <tm@ayena.de>
parents: 3099
diff changeset
127
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128 -- we don't do any channel binding yet
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Tobias Markmann <tm@ayena.de>
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diff changeset
129 if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
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130 return "failure", "malformed-request";
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131 end
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132
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133 if not self.state.name or not self.state.clientnonce then
3099
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parents: 3098
diff changeset
134 return "failure", "malformed-request", "Channel binding isn't support at this time.";
3096
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diff changeset
135 end
2199
08a6b91bfe7b SASLprep usernames and passwords.
Tobias Markmann <tm@ayena.de>
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diff changeset
136
3096
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137 self.state.name = validate_username(self.state.name);
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138 if not self.state.name then
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diff changeset
139 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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140 return "failure", "malformed-request", "Invalid username.";
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diff changeset
141 end
2196
614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
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diff changeset
142
3096
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parents: 3094
diff changeset
143 self.state["servernonce"] = generate_uuid();
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144
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diff changeset
145 -- retreive credentials
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parents: 3094
diff changeset
146 if self.profile.plain then
3098
e5d349c0acde util.sasl.scram: Fixed global access.
Waqas Hussain <waqas20@gmail.com>
parents: 3097
diff changeset
147 local password, state = self.profile.plain(self.state.name, self.realm)
3096
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148 if state == nil then return "failure", "not-authorized"
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diff changeset
149 elseif state == false then return "failure", "account-disabled" end
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150
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diff changeset
151 password = saslprep(password);
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152 if not password then
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153 log("debug", "Password violates SASLprep.");
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154 return "failure", "not-authorized", "Invalid password."
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155 end
3104
32150b4a8603 util.sasl.scram: Providing an API function to generate a salted password for the SCRAM-SHA-1 mechanism.
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diff changeset
156
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157 self.state.salt = generate_uuid();
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158 self.state.iteration_count = default_i;
3104
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diff changeset
159
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parents: 3103
diff changeset
160 local succ = false;
32150b4a8603 util.sasl.scram: Providing an API function to generate a salted password for the SCRAM-SHA-1 mechanism.
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diff changeset
161 succ, self.state.salted_password = saltedPasswordSHA1(password, self.state.salt, default_i, self.state.iteration_count);
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diff changeset
162 if not succ then
32150b4a8603 util.sasl.scram: Providing an API function to generate a salted password for the SCRAM-SHA-1 mechanism.
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parents: 3103
diff changeset
163 log("error", "Generating salted password failed. Reason: %s", self.state.salted_password);
32150b4a8603 util.sasl.scram: Providing an API function to generate a salted password for the SCRAM-SHA-1 mechanism.
Tobias Markmann <tm@ayena.de>
parents: 3103
diff changeset
164 return "failure", "temporary-auth-failure";
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parents: 3103
diff changeset
165 end
3122
579f17b9f948 util.sasl.*: Adjusting authentication provider names. All '-' replaced with '_'
Tobias Markmann <tm@ayena.de>
parents: 3118
diff changeset
166 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
167 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
168 if state == nil then return "failure", "not-authorized"
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diff changeset
169 elseif state == false then return "failure", "account-disabled" end
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170
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parents: 3094
diff changeset
171 self.state.salted_password = salted_password;
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172 self.state.iteration_count = iteration_count;
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173 self.state.salt = salt
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parents: 3094
diff changeset
174 end
2196
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diff changeset
175
3096
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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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diff changeset
181 local client_final_message = message;
3099
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
diff changeset
182
3102
5cd408e36359 util.sasl.scram: Parsing client-final-message in a more strict way. (thanks Marc Santamaria)
Tobias Markmann <tm@ayena.de>
parents: 3101
diff changeset
183 self.state["channelbinding"], self.state["nonce"], self.state["proof"] = client_final_message:match("^c=(.*),r=(.*),.*p=(.*)");
3099
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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184
3096
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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
3099
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diff changeset
188
3101
9e4439378cf8 util.sasl.scram: Fix in nonce check of client-final-message.
Tobias Markmann <tm@ayena.de>
parents: 3100
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.
Tobias Markmann <tm@ayena.de>
parents: 3100
diff changeset
190 return "failure", "malformed-request", "Wrong nonce in client-final-message.";
3099
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)
Tobias Markmann <tm@ayena.de>
parents: 3098
diff changeset
191 end
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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diff changeset
192
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193 local SaltedPassword = self.state.salted_password;
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diff changeset
194 local ClientKey = HMAC_f(SaltedPassword, "Client Key")
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195 local ServerKey = HMAC_f(SaltedPassword, "Server Key")
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diff changeset
196 local StoredKey = H_f(ClientKey)
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Tobias Markmann <tm@ayena.de>
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diff changeset
197 local AuthMessage = "n=" .. s_match(self.state.client_first_message,"n=(.+)") .. "," .. self.state.server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+")
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diff changeset
198 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
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diff changeset
199 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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diff changeset
200 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
3099
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)
Tobias Markmann <tm@ayena.de>
parents: 3098
diff changeset
201
3096
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diff changeset
202 if base64.encode(ClientProof) == self.state.proof then
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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203 local server_final_message = "v="..base64.encode(ServerSignature);
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diff changeset
204 self["username"] = self.state.name;
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diff changeset
205 return "success", server_final_message;
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diff changeset
206 else
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diff changeset
207 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
2199
08a6b91bfe7b SASLprep usernames and passwords.
Tobias Markmann <tm@ayena.de>
parents: 2198
diff changeset
208 end
2196
614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
Tobias Markmann <tm@ayena.de>
parents: 2194
diff changeset
209 end
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
210 end
3096
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diff changeset
211 return scram_hash;
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
212 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
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213
41d42d253a1d Initial commit of SCRAM SASL mechanism.
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parents:
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214 function init(registerMechanism)
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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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215 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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216 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hashprep(hash_name))}, scram_gen(hash_name:lower(), hash, hmac_hash));
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parents: 3094
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217 end
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2c4d06e7e3d3 util.sasl.scram: Check nonce in client final message. Check channel binding flag in client first message. Adding some TODOs on more strict parsing. (thanks Marc Santamaria)
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parents: 3098
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218
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e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
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parents: 3094
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219 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
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parents:
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220 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
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221
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6d576a66ca63 util.sasl.scram: Adjusting authentication backend name to conform with the style already used by the plain module.
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parents: 3106
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222 return _M;