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5de663cef508
util/sasl/scram.lua

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util/sasl/scram.lua @ 8558:5de663cef508

util_pubsub_spec: Beginnings of tests for util.pubsub
author Kim Alvefur <zash@zash.se>
date Sat, 03 Mar 2018 20:55:46 +0100
parent 8555:4f0f5b49bb03
child 8728:41c959c5c84b
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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 local _ENV = nil;
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29 -- luacheck: std none
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30
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31 --=========================
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32 --SASL SCRAM-SHA-1 according to RFC 5802
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34 --[[
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35 Supported Authentication Backends
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36
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37 scram_{MECH}:
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38 -- MECH being a standard hash name (like those at IANA's hash registry) with '-' replaced with '_'
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39 function(username, realm)
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40 return stored_key, server_key, iteration_count, salt, state;
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41 end
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42
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43 Supported Channel Binding Backends
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44
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45 'tls-unique' according to RFC 5929
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46 ]]
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47
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48 local default_i = 4096
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49
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50 local xor_map = {
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51 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,
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52 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,
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53 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,
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54 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,
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55 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,
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56 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,
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57 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,
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58 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,
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59 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,
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60 14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,
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61 };
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62
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63 local result = {};
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64 local function binaryXOR( a, b )
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65 for i=1, #a do
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66 local x, y = byte(a, i), byte(b, i);
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67 local lowx, lowy = x % 16, y % 16;
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68 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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69 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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70 local r = hir * 16 + lowr;
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71 result[i] = char(r)
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72 end
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73 return t_concat(result);
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74 end
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75
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76 local function validate_username(username, _nodeprep)
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77 -- check for forbidden char sequences
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78 for eq in username:gmatch("=(.?.?)") do
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79 if eq ~= "2C" and eq ~= "3D" then
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80 return false
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81 end
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82 end
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83
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84 -- replace =2C with , and =3D with =
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85 username = username:gsub("=2C", ",");
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86 username = username:gsub("=3D", "=");
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87
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88 -- apply SASLprep
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89 username = saslprep(username);
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90
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91 if username and _nodeprep ~= false then
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92 username = (_nodeprep or nodeprep)(username);
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93 end
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94
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95 return username and #username>0 and username;
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96 end
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97
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98 local function hashprep(hashname)
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99 return hashname:lower():gsub("-", "_");
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100 end
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101
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102 local function getAuthenticationDatabaseSHA1(password, salt, iteration_count)
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103 if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
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104 return false, "inappropriate argument types"
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105 end
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106 if iteration_count < 4096 then
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107 log("warn", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
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108 end
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62089c9c142d util.hashes, util.sasl.scram: Implement SCRAM-SHA1's Hi in C
Florian Zeitz <florob@babelmonkeys.de>
parents: 5537
diff changeset
109 local salted_password = Hi(password, salt, iteration_count);
3205
2dcd826bbbc6 mod_auth_internal_hashed: Store StoredKey and ServerKey instead of salted hashed password.
Tobias Markmann <tm@ayena.de>
parents: 3196
diff changeset
110 local stored_key = sha1(hmac_sha1(salted_password, "Client Key"))
2dcd826bbbc6 mod_auth_internal_hashed: Store StoredKey and ServerKey instead of salted hashed password.
Tobias Markmann <tm@ayena.de>
parents: 3196
diff changeset
111 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
112 return true, stored_key, server_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
113 end
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
114
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
115 local function scram_gen(hash_name, H_f, HMAC_f)
5870
61f748d363e1 util.sasl.scram: Cache profile name instead of concatenating when used
Kim Alvefur <zash@zash.se>
parents: 5869
diff changeset
116 local profile_name = "scram_" .. hashprep(hash_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
117 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
118 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
119 if self.profile.cb then support_channel_binding = true; end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
120
3106
f4341cac3ae1 util.sasl.scram: Fixing issue #177.
Tobias Markmann <tm@ayena.de>
parents: 3104
diff changeset
121 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
122 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
123 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
124 -- 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
125 local client_first_message = message;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
126
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
127 -- TODO: fail if authzid is provided, since we don't support them yet
5871
e80916ce8d32 util.sasl.scram: Rename variable for clarity
Kim Alvefur <zash@zash.se>
parents: 5870
diff changeset
128 local gs2_header, gs2_cbind_flag, gs2_cbind_name, authzid, client_first_message_bare, username, clientnonce
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
129 = 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
130
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
131 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
132 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
133 end
a65b56348034 util.sasl.scram: Checking the GS2 header for valid start flag.
Tobias Markmann <tm@ayena.de>
parents: 5837
diff changeset
134
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
135 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
136 -- "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
137 -- but thinks the server does not.
5828
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
138 return "failure", "malformed-request";
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
139 end
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
140
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
141 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
142 -- "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
143 support_channel_binding = false;
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
144 end
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
145
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
146 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
147 -- 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
148 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
149 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
150 end
5828
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
151 else
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
152 -- 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
153 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
154 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
155
5871
e80916ce8d32 util.sasl.scram: Rename variable for clarity
Kim Alvefur <zash@zash.se>
parents: 5870
diff changeset
156 username = validate_username(username, self.profile.nodeprep);
e80916ce8d32 util.sasl.scram: Rename variable for clarity
Kim Alvefur <zash@zash.se>
parents: 5870
diff changeset
157 if not username 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
158 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
159 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
160 end
8095
57192cf193c7 util.sasl.plain,scram: Record username in sasl state earlier
Kim Alvefur <zash@zash.se>
parents: 7218
diff changeset
161 self.username = username;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
162
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
163 -- 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
164 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
165 if self.profile.plain then
7216
65e36b81d56a util.sasl.scram: Rename variable to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 6786
diff changeset
166 local password, status = self.profile.plain(self, username, self.realm)
65e36b81d56a util.sasl.scram: Rename variable to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 6786
diff changeset
167 if status == nil then return "failure", "not-authorized"
65e36b81d56a util.sasl.scram: Rename variable to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 6786
diff changeset
168 elseif status == false then return "failure", "account-disabled" end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
169
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 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
171 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
172 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
173 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
174 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
175
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
176 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
177 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
178
7217
0a43b7ffa3af util.sasl.scram: Remove unused initial value [luacheck]
Kim Alvefur <zash@zash.se>
parents: 7216
diff changeset
179 local succ;
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
180 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
181 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
182 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
183 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
184 end
5870
61f748d363e1 util.sasl.scram: Cache profile name instead of concatenating when used
Kim Alvefur <zash@zash.se>
parents: 5869
diff changeset
185 elseif self.profile[profile_name] then
7216
65e36b81d56a util.sasl.scram: Rename variable to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 6786
diff changeset
186 local status;
65e36b81d56a util.sasl.scram: Rename variable to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 6786
diff changeset
187 stored_key, server_key, iteration_count, salt, status = self.profile[profile_name](self, username, self.realm);
7218
6226307f6ac4 util.sasl.scram: Rename variable in places missed in 65e36b81d56a (thanks mt)
Kim Alvefur <zash@zash.se>
parents: 7217
diff changeset
188 if status == nil then return "failure", "not-authorized"
6226307f6ac4 util.sasl.scram: Rename variable in places missed in 65e36b81d56a (thanks mt)
Kim Alvefur <zash@zash.se>
parents: 7217
diff changeset
189 elseif status == false then return "failure", "account-disabled" 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
190 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
191
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
192 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
193 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
194 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
195 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
196 gs2_cbind_name = gs2_cbind_name;
5871
e80916ce8d32 util.sasl.scram: Rename variable for clarity
Kim Alvefur <zash@zash.se>
parents: 5870
diff changeset
197 username = username;
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
198 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
199
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 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
201 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
202 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
203 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
204 }
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
205 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
206 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
207 -- 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
208 local client_final_message = message;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
209
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
210 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
211 = 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
212
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
213 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
214 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
215 end
4b484e8feafc sasl.util.scarm: Rearrage some code so it makes more sense.
Tobias Markmann <tm@ayena.de>
parents: 5839
diff changeset
216
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
217 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
218 local our_client_gs2_header = state["gs2_header"]
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219 if state.gs2_cbind_name then
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4b484e8feafc sasl.util.scarm: Rearrage some code so it makes more sense.
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220 -- we support channelbinding, so check if the value is valid
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221 our_client_gs2_header = our_client_gs2_header .. self.profile.cb[state.gs2_cbind_name](self);
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Kim Alvefur <zash@zash.se>
parents: 5856
diff changeset
222 end
72d49d1e2d11 util.sasl.scram: Compare gs2-header to cbind-input (Thanks Tobias)
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parents: 5856
diff changeset
223 if client_gs2_header ~= our_client_gs2_header then
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224 return "failure", "malformed-request", "Invalid channel binding value.";
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225 end
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parents: 3098
diff changeset
226
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diff changeset
227 if nonce ~= state.nonce then
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9e4439378cf8 util.sasl.scram: Fix in nonce check of client-final-message.
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parents: 3100
diff changeset
228 return "failure", "malformed-request", "Wrong nonce in client-final-message.";
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Tobias Markmann <tm@ayena.de>
parents: 3098
diff changeset
229 end
5776
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
230
5868
bc37c6758f3a util.sasl.scram: Create the state table as late as possible, keep state in locals for faster access
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parents: 5867
diff changeset
231 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>
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diff changeset
232 local StoredKey = state.stored_key;
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
233
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
234 local AuthMessage = state.client_first_message_bare .. "," .. state.server_first_message .. "," .. client_final_message_without_proof
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parents: 3094
diff changeset
235 local ClientSignature = HMAC_f(StoredKey, AuthMessage)
5868
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Kim Alvefur <zash@zash.se>
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diff changeset
236 local ClientKey = binaryXOR(ClientSignature, base64.decode(proof))
3096
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parents: 3094
diff changeset
237 local ServerSignature = HMAC_f(ServerKey, AuthMessage)
3099
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Tobias Markmann <tm@ayena.de>
parents: 3098
diff changeset
238
3206
ff1d3f751da1 util.sasl.scram: Authenticate clients by calculated StoredKey instead of ClientProof.
Tobias Markmann <tm@ayena.de>
parents: 3205
diff changeset
239 if StoredKey == H_f(ClientKey) then
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Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
240 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.
Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
241 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
242 else
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parents: 3094
diff changeset
243 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
244 end
2196
614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
Tobias Markmann <tm@ayena.de>
parents: 2194
diff changeset
245 end
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
246 end
3096
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parents: 3094
diff changeset
247 return scram_hash;
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
248 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
249
6786
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Kim Alvefur <zash@zash.se>
parents: 5871
diff changeset
250 local function init(registerMechanism)
3096
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Tobias Markmann <tm@ayena.de>
parents: 3094
diff changeset
251 local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
8382
e5d00bf4a4d5 util: Various minor changes to please [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8095
diff changeset
252 registerMechanism("SCRAM-"..hash_name,
e5d00bf4a4d5 util: Various minor changes to please [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8095
diff changeset
253 {"plain", "scram_"..(hashprep(hash_name))},
e5d00bf4a4d5 util: Various minor changes to please [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8095
diff changeset
254 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
255
5828
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
256 -- register channel binding equivalent
8382
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Kim Alvefur <zash@zash.se>
parents: 8095
diff changeset
257 registerMechanism("SCRAM-"..hash_name.."-PLUS",
e5d00bf4a4d5 util: Various minor changes to please [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8095
diff changeset
258 {"plain", "scram_"..(hashprep(hash_name))},
e5d00bf4a4d5 util: Various minor changes to please [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8095
diff changeset
259 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
260 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
261
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
262 registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
2194
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
263 end
41d42d253a1d Initial commit of SCRAM SASL mechanism.
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
264
6786
3deeb38d79ab util.sasl.scram: Get rid of module call
Kim Alvefur <zash@zash.se>
parents: 5871
diff changeset
265 return {
3deeb38d79ab util.sasl.scram: Get rid of module call
Kim Alvefur <zash@zash.se>
parents: 5871
diff changeset
266 getAuthenticationDatabaseSHA1 = getAuthenticationDatabaseSHA1;
3deeb38d79ab util.sasl.scram: Get rid of module call
Kim Alvefur <zash@zash.se>
parents: 5871
diff changeset
267 init = init;
3deeb38d79ab util.sasl.scram: Get rid of module call
Kim Alvefur <zash@zash.se>
parents: 5871
diff changeset
268 }