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61f748d363e1
util/sasl/scram.lua

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util/sasl/scram.lua @ 5870:61f748d363e1

util.sasl.scram: Cache profile name instead of concatenating when used
author Kim Alvefur <zash@zash.se>
date Sun, 13 Oct 2013 01:36:28 +0200
parent 5869:35780ef2d689
child 5871:e80916ce8d32
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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14 local s_match = string.match;
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15 local type = type
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16 local base64 = require "util.encodings".base64;
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17 local hmac_sha1 = require "util.hashes".hmac_sha1;
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18 local sha1 = require "util.hashes".sha1;
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19 local Hi = require "util.hashes".scram_Hi_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 nodeprep = require "util.encodings".stringprep.nodeprep;
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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 "sasl.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 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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50
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51 local result = {};
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52 local function binaryXOR( a, b )
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53 for i=1, #a do
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54 local x, y = byte(a, i), byte(b, i);
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55 local lowx, lowy = x % 16, y % 16;
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56 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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57 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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58 local r = hir * 16 + lowr;
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59 result[i] = char(r)
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60 end
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61 return t_concat(result);
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62 end
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63
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64 local function validate_username(username, _nodeprep)
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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 ~= "2C" 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 =2C with , and =3D with =
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73 username = username:gsub("=2C", ",");
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74 username = 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
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79 if username and _nodeprep ~= false then
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80 username = (_nodeprep or nodeprep)(username);
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81 end
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82
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83 return username and #username>0 and username;
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84 end
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85
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86 local function hashprep(hashname)
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87 return hashname:lower():gsub("-", "_");
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88 end
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89
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90 function getAuthenticationDatabaseSHA1(password, salt, iteration_count)
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91 if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
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92 return false, "inappropriate argument types"
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93 end
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94 if iteration_count < 4096 then
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95 log("warn", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
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96 end
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97 local salted_password = Hi(password, salt, iteration_count);
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98 local stored_key = sha1(hmac_sha1(salted_password, "Client Key"))
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99 local server_key = hmac_sha1(salted_password, "Server Key");
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100 return true, stored_key, server_key
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101 end
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102
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103 local function scram_gen(hash_name, H_f, HMAC_f)
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104 local profile_name = "scram_" .. hashprep(hash_name);
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Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
105 local function scram_hash(self, message)
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
106 local support_channel_binding = false;
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
107 if self.profile.cb then support_channel_binding = true; end
5776
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
108
3106
f4341cac3ae1 util.sasl.scram: Fixing issue #177.
Tobias Markmann <tm@ayena.de>
parents: 3104
diff changeset
109 if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
110 local state = self.state;
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
111 if not state then
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
112 -- we are processing client_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
113 local client_first_message = message;
5776
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
114
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
115 -- TODO: fail if authzid is provided, since we don't support them yet
5869
35780ef2d689 util.sasl.scram: Rewrite patterns and capture client-first-message-bare, client-final-message-without-proof
Kim Alvefur <zash@zash.se>
parents: 5868
diff changeset
116 local gs2_header, gs2_cbind_flag, gs2_cbind_name, authzid, client_first_message_bare, name, clientnonce
35780ef2d689 util.sasl.scram: Rewrite patterns and capture client-first-message-bare, client-final-message-without-proof
Kim Alvefur <zash@zash.se>
parents: 5868
diff changeset
117 = s_match(client_first_message, "^(([pny])=?([^,]*),([^,]*),)(m?=?[^,]*,?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
118
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
119 if not gs2_cbind_flag then
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
120 return "failure", "malformed-request";
5839
a65b56348034 util.sasl.scram: Checking the GS2 header for valid start flag.
Tobias Markmann <tm@ayena.de>
parents: 5837
diff changeset
121 end
a65b56348034 util.sasl.scram: Checking the GS2 header for valid start flag.
Tobias Markmann <tm@ayena.de>
parents: 5837
diff changeset
122
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
123 if support_channel_binding and gs2_cbind_flag == "y" then
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
124 -- "y" -> client does support channel binding
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
125 -- but thinks the server does not.
5828
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
126 return "failure", "malformed-request";
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
127 end
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
128
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
129 if gs2_cbind_flag == "n" then
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
130 -- "n" -> client doesn't support channel binding.
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
131 support_channel_binding = false;
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
132 end
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
133
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
134 if support_channel_binding and gs2_cbind_flag == "p" then
5829
40c16475194e Check whether we support the proposed channel binding type.
Tobias Markmann <tm@ayena.de>
parents: 5828
diff changeset
135 -- check whether we support the proposed channel binding type
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
136 if not self.profile.cb[gs2_cbind_name] then
5829
40c16475194e Check whether we support the proposed channel binding type.
Tobias Markmann <tm@ayena.de>
parents: 5828
diff changeset
137 return "failure", "malformed-request", "Proposed channel binding type isn't supported.";
40c16475194e Check whether we support the proposed channel binding type.
Tobias Markmann <tm@ayena.de>
parents: 5828
diff changeset
138 end
5828
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
139 else
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
140 -- no channel binding,
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
141 gs2_cbind_name = nil;
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
142 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
143
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
144 name = validate_username(name, self.profile.nodeprep);
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
145 if not name then
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
146 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
147 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
148 end
5776
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
149
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
150 -- retreive credentials
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
151 local stored_key, server_key, salt, iteration_count;
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
152 if self.profile.plain then
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
153 local password, state = self.profile.plain(self, 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
154 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
155 elseif state == false then return "failure", "account-disabled" end
5776
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
156
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 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
158 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
159 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
160 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
161 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
162
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
163 salt = generate_uuid();
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
164 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
165
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
166 local succ = false;
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
167 succ, stored_key, server_key = getAuthenticationDatabaseSHA1(password, salt, 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
168 if not succ then
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
169 log("error", "Generating authentication database failed. Reason: %s", 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
170 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
171 end
5870
61f748d363e1 util.sasl.scram: Cache profile name instead of concatenating when used
Kim Alvefur <zash@zash.se>
parents: 5869
diff changeset
172 elseif self.profile[profile_name] then
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
173 local state;
5870
61f748d363e1 util.sasl.scram: Cache profile name instead of concatenating when used
Kim Alvefur <zash@zash.se>
parents: 5869
diff changeset
174 stored_key, server_key, iteration_count, salt, state = self.profile[profile_name](self, 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
175 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
176 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
177 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
178
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
179 local nonce = clientnonce .. generate_uuid();
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
180 local server_first_message = "r="..nonce..",s="..base64.encode(salt)..",i="..iteration_count;
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
181 self.state = {
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
182 gs2_header = gs2_header;
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
183 gs2_cbind_name = gs2_cbind_name;
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
184 name = name;
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
185 nonce = nonce;
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
186
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
187 server_key = server_key;
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
188 stored_key = stored_key;
5869
35780ef2d689 util.sasl.scram: Rewrite patterns and capture client-first-message-bare, client-final-message-without-proof
Kim Alvefur <zash@zash.se>
parents: 5868
diff changeset
189 client_first_message_bare = client_first_message_bare;
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
190 server_first_message = server_first_message;
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
191 }
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
192 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
193 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
194 -- 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
195 local client_final_message = message;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
196
5869
35780ef2d689 util.sasl.scram: Rewrite patterns and capture client-first-message-bare, client-final-message-without-proof
Kim Alvefur <zash@zash.se>
parents: 5868
diff changeset
197 local client_final_message_without_proof, channelbinding, nonce, proof
35780ef2d689 util.sasl.scram: Rewrite patterns and capture client-first-message-bare, client-final-message-without-proof
Kim Alvefur <zash@zash.se>
parents: 5868
diff changeset
198 = s_match(client_final_message, "(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
199
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
200 if not proof or not nonce or not channelbinding then
5840
4b484e8feafc sasl.util.scarm: Rearrage some code so it makes more sense.
Tobias Markmann <tm@ayena.de>
parents: 5839
diff changeset
201 return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
4b484e8feafc sasl.util.scarm: Rearrage some code so it makes more sense.
Tobias Markmann <tm@ayena.de>
parents: 5839
diff changeset
202 end
4b484e8feafc sasl.util.scarm: Rearrage some code so it makes more sense.
Tobias Markmann <tm@ayena.de>
parents: 5839
diff changeset
203
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
204 local client_gs2_header = base64.decode(channelbinding)
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
205 local our_client_gs2_header = state["gs2_header"]
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
206 if state.gs2_cbind_name then
5840
4b484e8feafc sasl.util.scarm: Rearrage some code so it makes more sense.
Tobias Markmann <tm@ayena.de>
parents: 5839
diff changeset
207 -- we support channelbinding, so check if the value is valid
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
208 our_client_gs2_header = our_client_gs2_header .. self.profile.cb[state.gs2_cbind_name](self);
5867
72d49d1e2d11 util.sasl.scram: Compare gs2-header to cbind-input (Thanks Tobias)
Kim Alvefur <zash@zash.se>
parents: 5856
diff changeset
209 end
72d49d1e2d11 util.sasl.scram: Compare gs2-header to cbind-input (Thanks Tobias)
Kim Alvefur <zash@zash.se>
parents: 5856
diff changeset
210 if client_gs2_header ~= our_client_gs2_header then
72d49d1e2d11 util.sasl.scram: Compare gs2-header to cbind-input (Thanks Tobias)
Kim Alvefur <zash@zash.se>
parents: 5856
diff changeset
211 return "failure", "malformed-request", "Invalid channel binding value.";
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
212 end
3099
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Tobias Markmann <tm@ayena.de>
parents: 3098
diff changeset
213
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
214 if nonce ~= state.nonce then
3101
9e4439378cf8 util.sasl.scram: Fix in nonce check of client-final-message.
Tobias Markmann <tm@ayena.de>
parents: 3100
diff changeset
215 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
216 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
217
5868
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Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
218 local ServerKey = state.server_key;
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
219 local StoredKey = state.stored_key;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
220
5869
35780ef2d689 util.sasl.scram: Rewrite patterns and capture client-first-message-bare, client-final-message-without-proof
Kim Alvefur <zash@zash.se>
parents: 5868
diff changeset
221 local AuthMessage = state.client_first_message_bare .. "," .. state.server_first_message .. "," .. client_final_message_without_proof
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
222 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
223 local ClientKey = binaryXOR(ClientSignature, base64.decode(proof))
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
224 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
225
3206
ff1d3f751da1 util.sasl.scram: Authenticate clients by calculated StoredKey instead of ClientProof.
Tobias Markmann <tm@ayena.de>
parents: 3205
diff changeset
226 if StoredKey == H_f(ClientKey) then
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
227 local server_final_message = "v="..base64.encode(ServerSignature);
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
228 self["username"] = state.name;
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
229 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.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
230 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
231 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
232 end
2196
614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
Tobias Markmann <tm@ayena.de>
parents: 2194
diff changeset
233 end
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
234 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>
parents: 3094
diff changeset
235 return scram_hash;
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
236 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
237
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
238 function init(registerMechanism)
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
239 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
240 registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hashprep(hash_name))}, scram_gen(hash_name:lower(), hash, hmac_hash));
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
241
5828
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
242 -- register channel binding equivalent
5841
1b0c7e7c6be8 Only advertise mechanisms needing channel binding if a channel binding backend is avaliable.
Tobias Markmann <tm@ayena.de>
parents: 5840
diff changeset
243 registerMechanism("SCRAM-"..hash_name.."-PLUS", {"plain", "scram_"..(hashprep(hash_name))}, scram_gen(hash_name:lower(), hash, hmac_hash), {"tls-unique"});
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
244 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
245
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
246 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
247 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
248
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
249 return _M;