prosody
1509cabb8321
util/sasl/scram.lua

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util/sasl/scram.lua @ 2197:1509cabb8321

Add check for forbidden char sequences in validate_username().
author Tobias Markmann <tm@ayena.de>
date Tue, 17 Nov 2009 11:31:59 +0100
parent 2196:614c839c30c5
child 2198:d18b4d22b8da
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
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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 for eq in s:gmatch("=(.?.?)") do
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64 if eq ~= "2D" and eq ~= "3D" then return false end end return true;
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65 -- replace =2D with , and =3D with =
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66
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67 -- apply SASLprep
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68 return username;
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69 end
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70
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71 local function scram_sha_1(self, message)
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72 if not self.state then self["state"] = {} end
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73
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74 if not self.state.name then
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75 -- we are processing client_first_message
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76 local client_first_message = message;
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77 self.state["name"] = client_first_message:match("n=(.+),r=")
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78 self.state["clientnonce"] = client_first_message:match("r=([^,]+)")
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79
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80 self.state.name = validate_username(self.state.name);
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81 if not self.state.name or not self.state.clientnonce then
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82 return "failure", "malformed-request";
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83 end
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84 self.state["servernonce"] = generate_uuid();
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85 self.state["salt"] = generate_uuid();
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86
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87 local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..default_i;
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88 return "challenge", server_first_message
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89 else
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90 -- we are processing client_final_message
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91 local client_final_message = message;
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92
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93 self.state["proof"] = client_final_message:match("p=(.+)");
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94 self.state["nonce"] = client_final_message:match("r=(.+),p=");
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95 self.state["channelbinding"] = client_final_message:match("c=(.+),r=");
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96 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
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97 return "failure", "malformed-request";
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98 end
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99
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100 local password;
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101 if self.profile.plain then
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102 password, state = self.profile.plain(self.state.name, self.realm)
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103 if state == nil then return "failure", "not-authorized"
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104 elseif state == false then return "failure", "account-disabled" end
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105 end
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106
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107 local SaltedPassword = Hi(hmac_sha1, password, self.state.salt, default_i)
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108 local ClientKey = hmac_sha1(SaltedPassword, "Client Key")
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109 local ServerKey = hmac_sha1(SaltedPassword, "Server Key")
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110 local StoredKey = sha1(ClientKey)
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111 local AuthMessage = "n=" .. s_match(client_first_message,"n=(.+)") .. "," .. server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+")
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112 local ClientSignature = hmac_sha1(StoredKey, AuthMessage)
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113 local ClientProof = binaryXOR(ClientKey, ClientSignature)
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114 local ServerSignature = hmac_sha1(ServerKey, AuthMessage)
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115
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116 if base64.encode(ClientProof) == self.state.proof then
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117 local server_final_message = "v="..base64.encode(ServerSignature);
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118 return "success", server_final_message;
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119 else
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120 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
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121 end
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122 end
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123 end
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124
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125 function init(registerMechanism)
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126 registerMechanism("SCRAM-SHA-1", {"plain"}, scram_sha_1);
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127 end
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128
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129 return _M;