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util/sasl/scram.lua

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util/sasl/scram.lua @ 13270:14bbfb2cc8dd default tip

lint: Teach luacheck about module:once Silence warning for using this introduced in 9c62ffbdf2ae
author Kim Alvefur <zash@zash.se>
date Sun, 15 Oct 2023 16:43:14 +0200
parent 12975:d10957394a3c
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rev   line source
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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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13
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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 "prosody.util.encodings".base64;
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17 local hashes = require "prosody.util.hashes";
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18 local generate_uuid = require "prosody.util.uuid".generate;
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19 local saslprep = require "prosody.util.encodings".stringprep.saslprep;
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20 local nodeprep = require "prosody.util.encodings".stringprep.nodeprep;
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21 local log = require "prosody.util.logger".init("sasl");
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22 local binaryXOR = require "prosody.util.strbitop".sxor;
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23
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24 local _ENV = nil;
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25 -- luacheck: std none
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26
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27 --=========================
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28 --SASL SCRAM-SHA-1 according to RFC 5802
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29
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30 --[[
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31 Supported Authentication Backends
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32
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33 scram_{MECH}:
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34 -- MECH being a standard hash name (like those at IANA's hash registry) with '-' replaced with '_'
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35 function(username, realm)
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36 return stored_key, server_key, iteration_count, salt, state;
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37 end
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38
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39 Supported Channel Binding Backends
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40
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41 'tls-unique' according to RFC 5929
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42 ]]
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43
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44 local default_i = 10000
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45
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46 local function validate_username(username, _nodeprep)
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47 -- check for forbidden char sequences
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48 for eq in username:gmatch("=(.?.?)") do
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49 if eq ~= "2C" and eq ~= "3D" then
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50 return false
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51 end
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52 end
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53
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54 -- replace =2C with , and =3D with =
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55 username = username:gsub("=2C", ",");
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56 username = username:gsub("=3D", "=");
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57
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58 -- apply SASLprep
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59 username = saslprep(username);
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60
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61 if username and _nodeprep ~= false then
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62 username = (_nodeprep or nodeprep)(username);
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63 end
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64
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65 return username and #username>0 and username;
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66 end
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67
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68 local function hashprep(hashname)
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69 return hashname:lower():gsub("-", "_");
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70 end
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71
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72 local function get_scram_hasher(H, HMAC, Hi)
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73 return function (password, salt, iteration_count)
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74 if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
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75 return false, "inappropriate argument types"
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76 end
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77 if iteration_count < 4096 then
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78 log("warn", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
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79 end
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80 password = saslprep(password);
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81 if not password then
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82 return false, "password fails SASLprep";
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83 end
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84 local salted_password = Hi(password, salt, iteration_count);
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85 local stored_key = H(HMAC(salted_password, "Client Key"))
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86 local server_key = HMAC(salted_password, "Server Key");
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87 return true, stored_key, server_key
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88 end
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89 end
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90
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91 local function scram_gen(hash_name, H_f, HMAC_f, get_auth_db, expect_cb)
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92 local profile_name = "scram_" .. hashprep(hash_name);
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93 local function scram_hash(self, message)
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94 local support_channel_binding = false;
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95 if self.profile.cb then support_channel_binding = true; end
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96
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97 if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
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98 local state = self.state;
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99 if not state then
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100 -- we are processing client_first_message
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101 local client_first_message = message;
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102
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103 -- TODO: fail if authzid is provided, since we don't support them yet
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104 local gs2_header, gs2_cbind_flag, gs2_cbind_name, authzid, client_first_message_bare, username, clientnonce
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105 = s_match(client_first_message, "^(([pny])=?([^,]*),([^,]*),)(m?=?[^,]*,?n=([^,]*),r=([^,]*),?.*)$");
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106
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107 if not gs2_cbind_flag then
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108 return "failure", "malformed-request";
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109 end
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110
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111 if support_channel_binding and gs2_cbind_flag == "y" then
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diff changeset
112 -- "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
113 -- but thinks the server does not.
12941
e77c607e8da8 util.sasl.scram: Fix off-by-one indentation
Kim Alvefur <zash@zash.se>
parents: 12596
diff changeset
114 return "failure", "malformed-request";
e77c607e8da8 util.sasl.scram: Fix off-by-one indentation
Kim Alvefur <zash@zash.se>
parents: 12596
diff changeset
115 end
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
116
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
117 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
118 -- "n" -> client doesn't support channel binding.
10774
207691ad98fe util.sasl.scram: Mention if clients try PLUS without channel binding
Kim Alvefur <zash@zash.se>
parents: 10499
diff changeset
119 if expect_cb then
207691ad98fe util.sasl.scram: Mention if clients try PLUS without channel binding
Kim Alvefur <zash@zash.se>
parents: 10499
diff changeset
120 log("debug", "Client unexpectedly doesn't support channel binding");
207691ad98fe util.sasl.scram: Mention if clients try PLUS without channel binding
Kim Alvefur <zash@zash.se>
parents: 10499
diff changeset
121 -- XXX Is it sensible to abort if the client starts -PLUS but doesn't use channel binding?
207691ad98fe util.sasl.scram: Mention if clients try PLUS without channel binding
Kim Alvefur <zash@zash.se>
parents: 10499
diff changeset
122 end
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
123 support_channel_binding = false;
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
124 end
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
125
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
126 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
127 -- check whether we support the proposed channel binding type
5868
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Kim Alvefur <zash@zash.se>
parents: 5867
diff changeset
128 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
129 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
130 end
5828
24de22c01f8d Adding some code for channel binding advertising.
Tobias Markmann <tm@ayena.de>
parents: 3981
diff changeset
131 else
5844
4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
Kim Alvefur <zash@zash.se>
parents: 5843
diff changeset
132 -- 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
133 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
134 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
135
5871
e80916ce8d32 util.sasl.scram: Rename variable for clarity
Kim Alvefur <zash@zash.se>
parents: 5870
diff changeset
136 username = validate_username(username, self.profile.nodeprep);
e80916ce8d32 util.sasl.scram: Rename variable for clarity
Kim Alvefur <zash@zash.se>
parents: 5870
diff changeset
137 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
138 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
139 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
140 end
8095
57192cf193c7 util.sasl.plain,scram: Record username in sasl state earlier
Kim Alvefur <zash@zash.se>
parents: 7218
diff changeset
141 self.username = username;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
142
8728
41c959c5c84b Fix spelling throughout the codebase [codespell]
Kim Alvefur <zash@zash.se>
parents: 8555
diff changeset
143 -- retrieve 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
144 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
145 if self.profile.plain then
12945
d2c1c327a4d1 util.sasl.{scram,plain}: Pass authzid to SASL profile callback
Kim Alvefur <zash@zash.se>
parents: 12941
diff changeset
146 local password, status = self.profile.plain(self, username, self.realm, authzid)
7216
65e36b81d56a util.sasl.scram: Rename variable to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 6786
diff changeset
147 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
148 elseif status == false then return "failure", "account-disabled" 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 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
151 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
152 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
153 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
154 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
155
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
156 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
157 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
158
7217
0a43b7ffa3af util.sasl.scram: Remove unused initial value [luacheck]
Kim Alvefur <zash@zash.se>
parents: 7216
diff changeset
159 local succ;
10216
a51d017e6173 util.sasl.scram: Factor out SHA-1 specific getAuthenticationDatabaseSHA1
Kim Alvefur <zash@zash.se>
parents: 8728
diff changeset
160 succ, stored_key, server_key = get_auth_db(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
161 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
162 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
163 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
164 end
5870
61f748d363e1 util.sasl.scram: Cache profile name instead of concatenating when used
Kim Alvefur <zash@zash.se>
parents: 5869
diff changeset
165 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
166 local status;
12945
d2c1c327a4d1 util.sasl.{scram,plain}: Pass authzid to SASL profile callback
Kim Alvefur <zash@zash.se>
parents: 12941
diff changeset
167 stored_key, server_key, iteration_count, salt, status = self.profile[profile_name](self, username, self.realm, authzid);
7218
6226307f6ac4 util.sasl.scram: Rename variable in places missed in 65e36b81d56a (thanks mt)
Kim Alvefur <zash@zash.se>
parents: 7217
diff changeset
168 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
169 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
170 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
171
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
172 local nonce = clientnonce .. generate_uuid();
10306
c0a94419c28e util.sasl.scram: Avoid implicit coersion of number to string
Kim Alvefur <zash@zash.se>
parents: 10295
diff changeset
173 local server_first_message = ("r=%s,s=%s,i=%d"):format(nonce, base64.encode(salt), iteration_count);
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
174 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
175 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
176 gs2_cbind_name = gs2_cbind_name;
12024
9184bdda22be util.sasl.scram: Store username property rather than cached local (#399)
Matthew Wild <mwild1@gmail.com>
parents: 11174
diff changeset
177 username = self.username; -- Reference property instead of local, in case it was modified by the profile
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
178 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
179
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 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
181 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
182 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
183 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
184 }
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
185 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
186 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
187 -- 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
188 local client_final_message = message;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
189
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
190 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
191 = 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
192
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
193 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
194 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
195 end
4b484e8feafc sasl.util.scarm: Rearrage some code so it makes more sense.
Tobias Markmann <tm@ayena.de>
parents: 5839
diff changeset
196
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
197 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
198 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
199 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
200 -- 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
201 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
202 end
72d49d1e2d11 util.sasl.scram: Compare gs2-header to cbind-input (Thanks Tobias)
Kim Alvefur <zash@zash.se>
parents: 5856
diff changeset
203 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
204 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
205 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
206
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
207 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
208 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
209 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
210
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
211 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
212 local StoredKey = state.stored_key;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5538
diff changeset
213
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
214 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
215 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
216 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
217 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
218
3206
ff1d3f751da1 util.sasl.scram: Authenticate clients by calculated StoredKey instead of ClientProof.
Tobias Markmann <tm@ayena.de>
parents: 3205
diff changeset
219 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
220 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
221 return "success", server_final_message;
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222 else
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223 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
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08a6b91bfe7b SASLprep usernames and passwords.
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224 end
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614c839c30c5 Completed SCRAM-SHA-1 implementation to a ready-to-test state.
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225 end
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41d42d253a1d Initial commit of SCRAM SASL mechanism.
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226 end
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227 return scram_hash;
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228 end
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229
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230 local auth_db_getters = {}
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231 local function init(registerMechanism)
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232 local function registerSCRAMMechanism(hash_name, hash, hmac_hash, pbkdf2)
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233 local get_auth_db = get_scram_hasher(hash, hmac_hash, pbkdf2);
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234 auth_db_getters[hash_name] = get_auth_db;
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235 registerMechanism("SCRAM-"..hash_name,
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236 {"plain", "scram_"..(hashprep(hash_name))},
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237 scram_gen(hash_name:lower(), hash, hmac_hash, get_auth_db));
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4f545674b0bc util.sasl.scram: Simplify validation of client-first-message
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238
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24de22c01f8d Adding some code for channel binding advertising.
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239 -- register channel binding equivalent
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240 registerMechanism("SCRAM-"..hash_name.."-PLUS",
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241 {"plain", "scram_"..(hashprep(hash_name))},
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242 scram_gen(hash_name:lower(), hash, hmac_hash, get_auth_db, true), {"tls-unique", "tls-exporter"});
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243 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)
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parents: 3098
diff changeset
244
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245 registerSCRAMMechanism("SHA-1", hashes.sha1, hashes.hmac_sha1, hashes.pbkdf2_hmac_sha1);
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246 registerSCRAMMechanism("SHA-256", hashes.sha256, hashes.hmac_sha256, hashes.pbkdf2_hmac_sha256);
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247 end
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248
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249 return {
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250 get_hash = get_scram_hasher;
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diff changeset
251 hashers = auth_db_getters;
10295
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diff changeset
252 getAuthenticationDatabaseSHA1 = get_scram_hasher(hashes.sha1, hashes.hmac_sha1, hashes.pbkdf2_hmac_sha1); -- COMPAT
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diff changeset
253 init = init;
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254 }