1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
-- Copyright (C) 2010 Jeff Mitchell
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local max = math.max;
local scram_hashers = require "util.sasl.scram".hashers;
local usermanager = require "core.usermanager";
local generate_uuid = require "util.uuid".generate;
local new_sasl = require "util.sasl".new;
local hex = require"util.hex";
local to_hex, from_hex = hex.to, hex.from;
local saslprep = require "util.encodings".stringprep.saslprep;
local log = module._log;
local host = module.host;
local accounts = module:open_store("accounts");
local hash_name = module:get_option_string("password_hash", "SHA-1");
local get_auth_db = assert(scram_hashers[hash_name], "SCRAM-"..hash_name.." not supported by SASL library");
local scram_name = "scram_"..hash_name:gsub("%-","_"):lower();
-- Default; can be set per-user
local default_iteration_count = 4096;
-- define auth provider
local provider = {};
function provider.test_password(username, password)
log("debug", "test password for user '%s'", username);
local credentials = accounts:get(username) or {};
password = saslprep(password);
if not password then
return nil, "Password fails SASLprep.";
end
if credentials.password ~= nil and string.len(credentials.password) ~= 0 then
if saslprep(credentials.password) ~= password then
return nil, "Auth failed. Provided password is incorrect.";
end
if provider.set_password(username, credentials.password) == nil then
return nil, "Auth failed. Could not set hashed password from plaintext.";
else
return true;
end
end
if credentials.iteration_count == nil or credentials.salt == nil or string.len(credentials.salt) == 0 then
return nil, "Auth failed. Stored salt and iteration count information is not complete.";
end
local valid, stored_key, server_key = get_auth_db(password, credentials.salt, credentials.iteration_count);
local stored_key_hex = to_hex(stored_key);
local server_key_hex = to_hex(server_key);
if valid and stored_key_hex == credentials.stored_key and server_key_hex == credentials.server_key then
return true;
else
return nil, "Auth failed. Invalid username, password, or password hash information.";
end
end
function provider.set_password(username, password)
log("debug", "set_password for username '%s'", username);
local account = accounts:get(username);
if account then
account.salt = generate_uuid();
account.iteration_count = max(account.iteration_count or 0, default_iteration_count);
local valid, stored_key, server_key = get_auth_db(password, account.salt, account.iteration_count);
if not valid then
return valid, stored_key;
end
local stored_key_hex = to_hex(stored_key);
local server_key_hex = to_hex(server_key);
account.stored_key = stored_key_hex
account.server_key = server_key_hex
account.password = nil;
return accounts:set(username, account);
end
return nil, "Account not available.";
end
function provider.user_exists(username)
local account = accounts:get(username);
if not account then
log("debug", "account not found for username '%s'", username);
return nil, "Auth failed. Invalid username";
end
return true;
end
function provider.users()
return accounts:users();
end
function provider.create_user(username, password)
if password == nil then
return accounts:set(username, {});
end
local salt = generate_uuid();
local valid, stored_key, server_key = get_auth_db(password, salt, default_iteration_count);
if not valid then
return valid, stored_key;
end
local stored_key_hex = to_hex(stored_key);
local server_key_hex = to_hex(server_key);
return accounts:set(username, {
stored_key = stored_key_hex, server_key = server_key_hex,
salt = salt, iteration_count = default_iteration_count
});
end
function provider.delete_user(username)
return accounts:set(username, nil);
end
function provider.get_sasl_handler()
local testpass_authentication_profile = {
plain_test = function(_, username, password, realm)
return usermanager.test_password(username, realm, password), true;
end,
[scram_name] = function(_, username)
local credentials = accounts:get(username);
if not credentials then return; end
if credentials.password then
if provider.set_password(username, credentials.password) == nil then
return nil, "Auth failed. Could not set hashed password from plaintext.";
end
credentials = accounts:get(username);
if not credentials then return; end
end
local stored_key, server_key = credentials.stored_key, credentials.server_key;
local iteration_count, salt = credentials.iteration_count, credentials.salt;
stored_key = stored_key and from_hex(stored_key);
server_key = server_key and from_hex(server_key);
return stored_key, server_key, iteration_count, salt, true;
end
};
return new_sasl(host, testpass_authentication_profile);
end
module:provides("auth", provider);
|
