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614c839c30c5
util/sasl/scram.lua

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util/sasl/scram.lua @ 2196:614c839c30c5

Completed SCRAM-SHA-1 implementation to a ready-to-test state.
author Tobias Markmann <tm@ayena.de>
date Tue, 17 Nov 2009 11:03:54 +0100
parent 2194:41d42d253a1d
child 2197:1509cabb8321
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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
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16 local base64 = require "util.encodings".base64;
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17 local xor = require "bit".bxor
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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
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22 module "plain"
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23
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24 --=========================
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25 --SASL SCRAM-SHA-1 according to draft-ietf-sasl-scram-10
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26 local default_i = 4096
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27
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28 local function bp( b )
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29 local result = ""
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30 for i=1, b:len() do
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31 result = result.."\\"..b:byte(i)
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32 end
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33 return result
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34 end
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35
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36 local function binaryXOR( a, b )
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37 if string.len(a) > string.len(b) then
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38 b = string.rep("\0", a:len() - b:len())..b
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39 elseif string.len(a) < string.len(b) then
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40 a = string.rep("\0", b:len() - a:len())..a
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41 end
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42 local result = ""
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43 for i=1, a:len() do
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44 result = result..string.char(xor(a:byte(i), b:byte(i)))
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45 end
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46 return result
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47 end
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48
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49 -- hash algorithm independent Hi(PBKDF2) implementation
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50 local function Hi(hmac, str, salt, i)
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51 local Ust = hmac(str, salt.."\0\0\0\1");
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52 local res = Ust;
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53 for n=1,i-1 do
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54 Und = hmac(str, Ust)
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55 res = binaryXOR(res, Und)
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56 Ust = Und
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57 end
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58 return res
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59 end
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60
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61 local function validate_username(username)
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62 -- check for forbidden char sequences
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63
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64 -- replace =2D with , and =3D with =
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65
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66 -- apply SASLprep
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67 return username;
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68 end
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69
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70 local function scram_sha_1(self, message)
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71 if not self.state then self["state"] = {} end
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72
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73 if not self.state.name then
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74 -- we are processing client_first_message
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75 local client_first_message = message;
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76 self.state["name"] = client_first_message:match("n=(.+),r=")
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77 self.state["clientnonce"] = client_first_message:match("r=([^,]+)")
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78
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79 self.state.name = validate_username(self.state.name);
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80 if not self.state.name or not self.state.clientnonce then
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81 return "failure", "malformed-request";
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82 end
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83 self.state["servernonce"] = generate_uuid();
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84 self.state["salt"] = generate_uuid();
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85
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86 local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..default_i;
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87 return "challenge", server_first_message
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88 else
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89 -- we are processing client_final_message
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90 local client_final_message = message;
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91
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92 self.state["proof"] = client_final_message:match("p=(.+)");
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93 self.state["nonce"] = client_final_message:match("r=(.+),p=");
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94 self.state["channelbinding"] = client_final_message:match("c=(.+),r=");
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95 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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96 return "failure", "malformed-request";
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97 end
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98
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99 local password;
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100 if self.profile.plain then
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101 password, state = self.profile.plain(self.state.name, self.realm)
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102 if state == nil then return "failure", "not-authorized"
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103 elseif state == false then return "failure", "account-disabled" end
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104 end
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105
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106 local SaltedPassword = Hi(hmac_sha1, password, self.state.salt, default_i)
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107 local ClientKey = hmac_sha1(SaltedPassword, "Client Key")
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108 local ServerKey = hmac_sha1(SaltedPassword, "Server Key")
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109 local StoredKey = sha1(ClientKey)
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110 local AuthMessage = "n=" .. s_match(client_first_message,"n=(.+)") .. "," .. server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+")
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111 local ClientSignature = hmac_sha1(StoredKey, AuthMessage)
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112 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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113 local ServerSignature = hmac_sha1(ServerKey, AuthMessage)
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114
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115 if base64.encode(ClientProof) == self.state.proof then
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116 local server_final_message = "v="..base64.encode(ServerSignature);
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117 return "success", server_final_message;
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118 else
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119 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
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120 end
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121 end
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122 end
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123
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124 function init(registerMechanism)
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125 registerMechanism("SCRAM-SHA-1", {"plain"}, scram_sha_1);
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126 end
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127
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128 return _M;