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fa8cfe830fef
util/sasl/scram.lua

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util/sasl/scram.lua @ 5836:fa8cfe830fef

util.sasl.scram: Adding reference to RFC 5929 'Channel Bindings for TLS'.
author Tobias Markmann <tm@ayena.de>
date Mon, 17 Jan 2011 16:50:21 +0100
parent 5835:a5f4de8c0b40
child 5837:574e91531994
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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 tostring = tostring;
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18 local base64 = require "util.encodings".base64;
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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 local t_concat = table.concat;
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25 local char = string.char;
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26 local byte = string.byte;
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27
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28 module "scram"
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30 --=========================
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31 --SASL SCRAM-SHA-1 according to RFC 5802
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32
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33 --[[
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34 Supported Authentication Backends
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35
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36 scram_{MECH}:
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37 -- MECH being a standard hash name (like those at IANA's hash registry) with '-' replaced with '_'
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38 function(username, realm)
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39 return stored_key, server_key, iteration_count, salt, state;
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40 end
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41
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42 Supported Channel Binding Backends
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43
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44 'tls-unique' according to RFC 5929
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45 ]]
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46
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47 local default_i = 4096
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48
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49 local function bp( b )
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50 local result = ""
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51 for i=1, b:len() do
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52 result = result.."\\"..b:byte(i)
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53 end
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54 return result
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55 end
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56
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57 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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58
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59 local result = {};
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60 local function binaryXOR( a, b )
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61 for i=1, #a do
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62 local x, y = byte(a, i), byte(b, i);
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63 local lowx, lowy = x % 16, y % 16;
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64 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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65 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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66 local r = hir * 16 + lowr;
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67 result[i] = char(r)
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68 end
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69 return t_concat(result);
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70 end
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71
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72 -- hash algorithm independent Hi(PBKDF2) implementation
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73 function Hi(hmac, str, salt, i)
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74 local Ust = hmac(str, salt.."\0\0\0\1");
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75 local res = Ust;
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76 for n=1,i-1 do
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77 local Und = hmac(str, Ust)
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78 res = binaryXOR(res, Und)
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79 Ust = Und
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80 end
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81 return res
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82 end
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83
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84 local function validate_username(username)
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85 -- check for forbidden char sequences
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86 for eq in username:gmatch("=(.?.?)") do
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87 if eq ~= "2D" and eq ~= "3D" then
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88 return false
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89 end
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90 end
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91
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92 -- replace =2D with , and =3D with =
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93 username = username:gsub("=2D", ",");
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94 username = username:gsub("=3D", "=");
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95
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96 -- apply SASLprep
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97 username = saslprep(username);
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98 return username;
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99 end
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100
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101 local function hashprep(hashname)
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102 return hashname:lower():gsub("-", "_");
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103 end
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104
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105 function getAuthenticationDatabaseSHA1(password, salt, iteration_count)
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106 if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
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107 return false, "inappropriate argument types"
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108 end
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109 if iteration_count < 4096 then
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110 log("warn", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
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111 end
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112 local salted_password = Hi(hmac_sha1, password, salt, iteration_count);
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113 local stored_key = sha1(hmac_sha1(salted_password, "Client Key"))
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diff changeset
114 local server_key = hmac_sha1(salted_password, "Server Key");
2dcd826bbbc6 mod_auth_internal_hashed: Store StoredKey and ServerKey instead of salted hashed password.
Tobias Markmann <tm@ayena.de>
parents: 3196
diff changeset
115 return true, stored_key, server_key
3104
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Tobias Markmann <tm@ayena.de>
parents: 3103
diff changeset
116 end
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
117
3096
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diff changeset
118 local function scram_gen(hash_name, H_f, HMAC_f)
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
119 local function scram_hash(self, message)
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120 if not self.state then self["state"] = {} end
5833
b1fa865ee6b2 util.sasl.scram: Use self.profile.cb for detection whether channel binding is supported or not.
Tobias Markmann <tm@ayena.de>
parents: 5829
diff changeset
121 local support_channel_binding = false;
b1fa865ee6b2 util.sasl.scram: Use self.profile.cb for detection whether channel binding is supported or not.
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parents: 5829
diff changeset
122 if self.profile.cb then support_channel_binding = true; end
b1fa865ee6b2 util.sasl.scram: Use self.profile.cb for detection whether channel binding is supported or not.
Tobias Markmann <tm@ayena.de>
parents: 5829
diff changeset
123
3106
f4341cac3ae1 util.sasl.scram: Fixing issue #177.
Tobias Markmann <tm@ayena.de>
parents: 3104
diff changeset
124 if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
3096
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
diff changeset
125 if not self.state.name 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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parents: 3094
diff changeset
126 -- we are processing client_first_message
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Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
127 local client_first_message = message;
5828
24de22c01f8d Adding some code for channel binding advertising.
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parents: 3981
diff changeset
128 log("debug", client_first_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
129 -- TODO: fail if authzid is provided, since we don't support them yet
3096
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parents: 3094
diff changeset
130 self.state["client_first_message"] = client_first_message;
5828
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parents: 3981
diff changeset
131 self.state["gs2_cbind_flag"], self.state["gs2_cbind_name"], self.state["authzid"], self.state["name"], self.state["clientnonce"]
24de22c01f8d Adding some code for channel binding advertising.
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parents: 3981
diff changeset
132 = client_first_message:match("^(%a)=?([%a%-]*),(.*),n=(.*),r=([^,]*).*");
3100
6731dff05c99 util.sasl.scram: Parsing client-first-message in a more strict way. (thanks Marc Santamaria)
Tobias Markmann <tm@ayena.de>
parents: 3099
diff changeset
133
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
134 -- we don't do any channel binding yet
5828
24de22c01f8d Adding some code for channel binding advertising.
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parents: 3981
diff changeset
135 log("debug", "Decoded: cbind_flag: %s, cbind_name: %s, authzid: %s, name: %s, clientnonce: %s", tostring(self.state.gs2_cbind_flag),
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
136 tostring(self.state.gs2_cbind_name),
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
137 tostring(self.state.authzid),
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
138 tostring(self.state.name),
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
139 tostring(self.state.clientnonce));
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
140 if support_channel_binding then
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
141 if string.sub(self.state.gs2_cbind_flag, 0, 1) == "y" then
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
142 return "failure", "malformed-request";
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
143 end
5829
40c16475194e Check whether we support the proposed channel binding type.
Tobias Markmann <tm@ayena.de>
parents: 5828
diff changeset
144
40c16475194e Check whether we support the proposed channel binding type.
Tobias Markmann <tm@ayena.de>
parents: 5828
diff changeset
145 -- check whether we support the proposed channel binding type
40c16475194e Check whether we support the proposed channel binding type.
Tobias Markmann <tm@ayena.de>
parents: 5828
diff changeset
146 if not self.profile.cb[self.state.gs2_cbind_name] then
40c16475194e Check whether we support the proposed channel binding type.
Tobias Markmann <tm@ayena.de>
parents: 5828
diff changeset
147 return "failure", "malformed-request", "Proposed channel binding type isn't supported.";
40c16475194e Check whether we support the proposed channel binding type.
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parents: 5828
diff changeset
148 end
5828
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
149 else
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
150 if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
151 return "failure", "malformed-request";
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
152 end
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
153 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)
Tobias Markmann <tm@ayena.de>
parents: 3098
diff changeset
154
3096
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parents: 3094
diff changeset
155 if not self.state.name or not self.state.clientnonce then
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
156 return "failure", "malformed-request", "Channel binding isn't support at this time.";
3096
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
157 end
2199
08a6b91bfe7b SASLprep usernames and passwords.
Tobias Markmann <tm@ayena.de>
parents: 2198
diff changeset
158
3096
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
159 self.state.name = validate_username(self.state.name);
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
160 if not self.state.name then
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
161 log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
162 return "failure", "malformed-request", "Invalid username.";
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
163 end
2196
614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
Tobias Markmann <tm@ayena.de>
parents: 2194
diff changeset
164
3096
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
165 self.state["servernonce"] = generate_uuid();
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
166
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
167 -- retreive credentials
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
168 if self.profile.plain then
3981
2b0b8fe68df2 util.sasl.*, mod_auth_*, mod_saslauth: Pass SASL handler as first parameter to SASL profile callbacks.
Waqas Hussain <waqas20@gmail.com>
parents: 3540
diff changeset
169 local password, state = self.profile.plain(self, self.state.name, self.realm)
3096
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
170 if state == nil then return "failure", "not-authorized"
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
171 elseif state == false then return "failure", "account-disabled" end
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
172
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
173 password = saslprep(password);
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
174 if not password then
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
175 log("debug", "Password violates SASLprep.");
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
176 return "failure", "not-authorized", "Invalid password."
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
177 end
3104
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
178
3096
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
179 self.state.salt = generate_uuid();
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
180 self.state.iteration_count = default_i;
3104
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
181
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
182 local succ = false;
3206
ff1d3f751da1 util.sasl.scram: Authenticate clients by calculated StoredKey instead of ClientProof.
Tobias Markmann <tm@ayena.de>
parents: 3205
diff changeset
183 succ, self.state.stored_key, self.state.server_key = getAuthenticationDatabaseSHA1(password, self.state.salt, default_i, self.state.iteration_count);
3104
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
184 if not succ then
3206
ff1d3f751da1 util.sasl.scram: Authenticate clients by calculated StoredKey instead of ClientProof.
Tobias Markmann <tm@ayena.de>
parents: 3205
diff changeset
185 log("error", "Generating authentication database failed. Reason: %s", self.state.stored_key);
3104
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
186 return "failure", "temporary-auth-failure";
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
187 end
3122
579f17b9f948 util.sasl.*: Adjusting authentication provider names. All '-' replaced with '_'
Tobias Markmann <tm@ayena.de>
parents: 3118
diff changeset
188 elseif self.profile["scram_"..hashprep(hash_name)] then
3981
2b0b8fe68df2 util.sasl.*, mod_auth_*, mod_saslauth: Pass SASL handler as first parameter to SASL profile callbacks.
Waqas Hussain <waqas20@gmail.com>
parents: 3540
diff changeset
189 local stored_key, server_key, iteration_count, salt, state = self.profile["scram_"..hashprep(hash_name)](self, self.state.name, self.realm);
3096
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
190 if state == nil then return "failure", "not-authorized"
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
191 elseif state == false then return "failure", "account-disabled" end
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
192
3206
ff1d3f751da1 util.sasl.scram: Authenticate clients by calculated StoredKey instead of ClientProof.
Tobias Markmann <tm@ayena.de>
parents: 3205
diff changeset
193 self.state.stored_key = stored_key;
ff1d3f751da1 util.sasl.scram: Authenticate clients by calculated StoredKey instead of ClientProof.
Tobias Markmann <tm@ayena.de>
parents: 3205
diff changeset
194 self.state.server_key = server_key;
3096
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
195 self.state.iteration_count = iteration_count;
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
196 self.state.salt = salt
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
197 end
2196
614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
Tobias Markmann <tm@ayena.de>
parents: 2194
diff changeset
198
3096
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
199 local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..self.state.iteration_count;
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
200 self.state["server_first_message"] = server_first_message;
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
201 return "challenge", server_first_message
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
202 else
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
203 -- we are processing client_final_message
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
204 local client_final_message = message;
5828
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
205 log("debug", "client_final_message: %s", client_final_message);
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
206 self.state["channelbinding"], self.state["nonce"], self.state["proof"] = client_final_message:match("^c=(.*),r=(.*),.*p=(.*)");
5835
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
207
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
208 if self.state.gs2_cbind_name then
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
209 local client_gs2_header = base64.decode(self.state.channelbinding)
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
210 local our_client_gs2_header = "p="..self.state.gs2_cbind_name..","..self.state["authzid"]..","..self.profile.cb[self.state.gs2_cbind_name](self);
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
211
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
212 if client_gs2_header ~= our_client_gs2_header then
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
213 return "failure", "malformed-request", "Invalid channel binding value.";
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
214 end
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
215 else
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
216 if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
217 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
a5f4de8c0b40 util.sasl.scram: Validate channel binding data of client final message.
Tobias Markmann <tm@ayena.de>
parents: 5833
diff changeset
218 end
3096
e69282792686 util.sasl: Abstracting out the hash function used since SCRAM is independent of it. Adding scram-{mech} authentication backend support.
Tobias Markmann <tm@ayena.de>
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219 end
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220
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221 if self.state.nonce ~= self.state.clientnonce..self.state.servernonce then
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222 return "failure", "malformed-request", "Wrong nonce in client-final-message.";
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223 end
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224
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ff1d3f751da1 util.sasl.scram: Authenticate clients by calculated StoredKey instead of ClientProof.
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225 local ServerKey = self.state.server_key;
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226 local StoredKey = self.state.stored_key;
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227
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228 local AuthMessage = "n=" .. s_match(self.state.client_first_message,"n=(.+)") .. "," .. self.state.server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+")
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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229 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
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230 local ClientKey = binaryXOR(ClientSignature, base64.decode(self.state.proof))
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parents: 3094
diff changeset
231 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
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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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232
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ff1d3f751da1 util.sasl.scram: Authenticate clients by calculated StoredKey instead of ClientProof.
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parents: 3205
diff changeset
233 if StoredKey == H_f(ClientKey) then
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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
diff changeset
234 local server_final_message = "v="..base64.encode(ServerSignature);
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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235 self["username"] = self.state.name;
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
diff changeset
236 return "success", server_final_message;
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
diff changeset
237 else
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
diff changeset
238 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
239 end
2196
614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
Tobias Markmann <tm@ayena.de>
parents: 2194
diff changeset
240 end
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
241 end
3096
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
diff changeset
242 return scram_hash;
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
243 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
244
41d42d253a1d Initial commit of SCRAM SASL mechanism.
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parents:
diff changeset
245 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
diff changeset
246 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
3122
579f17b9f948 util.sasl.*: Adjusting authentication provider names. All '-' replaced with '_'
Tobias Markmann <tm@ayena.de>
parents: 3118
diff changeset
247 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hashprep(hash_name))}, scram_gen(hash_name:lower(), hash, hmac_hash));
5828
24de22c01f8d Adding some code for channel binding advertising.
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parents: 3981
diff changeset
248
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
249 -- register channel binding equivalent
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
250 registerMechanism("SCRAM-"..hash_name.."-PLUS", {"plain", "scram_"..(hashprep(hash_name))}, scram_gen(hash_name:lower(), hash, hmac_hash));
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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.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
251 end
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
252
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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.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
253 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
254 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
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parents:
diff changeset
255
3107
6d576a66ca63 util.sasl.scram: Adjusting authentication backend name to conform with the style already used by the plain module.
Tobias Markmann <tm@ayena.de>
parents: 3106
diff changeset
256 return _M;