prosody
78c9b5255b27
util/sasl/scram.lua

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util/sasl/scram.lua @ 2210:78c9b5255b27

Adding some human readable error messages.
author Tobias Markmann <tm@ayena.de>
date Thu, 19 Nov 2009 17:17:52 +0100
parent 2206:5f54100bb426
child 2255:92e329e1cd99
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) 2008-2009 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 xor = require "bit".bxor
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19 local hmac_sha1 = require "util.hmac".sha1;
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20 local sha1 = require "util.hashes".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 log = require "util.logger".init("sasl");
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24
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25 module "scram"
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26
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27 --=========================
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28 --SASL SCRAM-SHA-1 according to draft-ietf-sasl-scram-10
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29 local default_i = 4096
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30
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31 local function bp( b )
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32 local result = ""
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33 for i=1, b:len() do
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34 result = result.."\\"..b:byte(i)
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35 end
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36 return result
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37 end
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38
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39 local function binaryXOR( a, b )
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40 if a:len() > b:len() then
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41 b = string.rep("\0", a:len() - b:len())..b
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42 elseif string.len(a) < string.len(b) then
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43 a = string.rep("\0", b:len() - a:len())..a
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44 end
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45 local result = ""
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46 for i=1, a:len() do
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47 result = result..string.char(xor(a:byte(i), 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 -- hash algorithm independent Hi(PBKDF2) implementation
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53 local function Hi(hmac, str, salt, i)
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54 local Ust = hmac(str, salt.."\0\0\0\1");
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55 local res = Ust;
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56 for n=1,i-1 do
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57 Und = hmac(str, Ust)
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58 res = binaryXOR(res, Und)
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59 Ust = Und
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60 end
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61 return res
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62 end
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63
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64 local function validate_username(username)
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65 -- check for forbidden char sequences
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66 for eq in username:gmatch("=(.?.?)") do
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67 if eq ~= "2D" and eq ~= "3D" then
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68 return false
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69 end
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70 end
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71
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72 -- replace =2D with , and =3D with =
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73 username:gsub("=2D", ",");
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74 username:gsub("=3D", "=");
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75
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76 -- apply SASLprep
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77 username = saslprep(username);
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78 return username;
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79 end
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80
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81 local function scram_sha_1(self, message)
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82 if not self.state then self["state"] = {} end
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83
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84 if not self.state.name then
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85 -- we are processing client_first_message
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86 local client_first_message = message;
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87 self.state["client_first_message"] = client_first_message;
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88 self.state["name"] = client_first_message:match("n=(.+),r=")
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89 self.state["clientnonce"] = client_first_message:match("r=([^,]+)")
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90
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91 if not self.state.name or not self.state.clientnonce then
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92 return "failure", "malformed-request";
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93 end
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94
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95 self.state.name = validate_username(self.state.name);
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96 if not self.state.name then
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97 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
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98 return "failure", "malformed-request", "Invalid username.";
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99 end
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100
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101 self.state["servernonce"] = generate_uuid();
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102 self.state["salt"] = generate_uuid();
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103
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104 local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..default_i;
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105 self.state["server_first_message"] = server_first_message;
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106 return "challenge", server_first_message
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107 else
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108 if type(message) ~= "string" then return "failure", "malformed-request" end
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109 -- we are processing client_final_message
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110 local client_final_message = message;
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111
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112 self.state["proof"] = client_final_message:match("p=(.+)");
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113 self.state["nonce"] = client_final_message:match("r=(.+),p=");
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114 self.state["channelbinding"] = client_final_message:match("c=(.+),r=");
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115 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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116 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
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117 end
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118
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119 local password;
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120 if self.profile.plain then
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121 password, state = self.profile.plain(self.state.name, self.realm)
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122 if state == nil then return "failure", "not-authorized"
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123 elseif state == false then return "failure", "account-disabled" end
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124 password = saslprep(password);
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125 if not password then
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126 log("debug", "Password violates SASLprep.");
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127 return "failure", "not-authorized", "Invalid password."
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128 end
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129 end
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130
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131 local SaltedPassword = Hi(hmac_sha1, password, self.state.salt, default_i)
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132 local ClientKey = hmac_sha1(SaltedPassword, "Client Key")
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133 local ServerKey = hmac_sha1(SaltedPassword, "Server Key")
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134 local StoredKey = sha1(ClientKey)
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135 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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136 local ClientSignature = hmac_sha1(StoredKey, AuthMessage)
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137 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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138 local ServerSignature = hmac_sha1(ServerKey, AuthMessage)
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139
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140 if base64.encode(ClientProof) == self.state.proof then
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141 local server_final_message = "v="..base64.encode(ServerSignature);
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142 self["username"] = self.state.name;
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143 return "success", server_final_message;
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144 else
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145 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
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146 end
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147 end
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148 end
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149
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150 function init(registerMechanism)
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151 registerMechanism("SCRAM-SHA-1", {"plain"}, scram_sha_1);
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152 end
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153
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154 return _M;