2 -- Copyright (C) 2008-2009 Tobias Markmann
4 -- All rights reserved.
6 -- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
8 -- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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.
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.
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.
15 local md5 = require "util.hashes".md5;
16 local log = require "util.logger".init("sasl");
17 local tostring = tostring;
18 local st = require "util.stanza";
19 local set = require "util.set";
20 local array = require "util.array";
21 local pairs, ipairs = pairs, ipairs;
22 local t_insert, t_concat = table.insert, table.concat;
23 local to_unicode = require "util.encodings".idna.to_unicode;
24 local s_match = string.match;
25 local gmatch = string.gmatch
27 local math = require "math"
31 local setmetatable = setmetatable;
32 local assert = assert;
33 local dofile = dofile;
34 local require = require;
36 require "util.iterators"
39 local array = require "util.array"
43 Authentication Backend Prototypes:
45 state = false : disabled
46 state = true : enabled
47 state = nil : non-existant
50 function(username, realm)
51 return password, state;
55 function(username, realm, password)
56 return true or false, state;
60 function(username, domain, realm, encoding) -- domain and realm are usually the same; for some broken
61 -- implementations it's not
62 return digesthash, state;
66 function(username, domain, realm, encoding, digesthash)
67 return true or false, state;
72 method.__index = method;
73 local mechanisms = {};
74 local backend_mechanism = {};
76 -- register a new SASL mechanims
77 local function registerMechanism(name, backends, f)
78 assert(type(name) == "string", "Parameter name MUST be a string.");
79 assert(type(backends) == "string" or type(backends) == "table", "Parameter backends MUST be either a string or a table.");
80 assert(type(f) == "function", "Parameter f MUST be a function.");
82 for _, backend_name in ipairs(backends) do
83 if backend_mechanism[backend_name] == nil then backend_mechanism[backend_name] = {}; end
84 t_insert(backend_mechanism[backend_name], name);
88 -- create a new SASL object which can be used to authenticate clients
89 function new(realm, profile, forbidden)
90 sasl_i = {profile = profile};
92 s = setmetatable(sasl_i, method);
93 s:forbidden(sasl_i, forbidden)
97 -- set the forbidden mechanisms
98 function method:forbidden( forbidden )
101 self.forbidden = set.new(forbidden);
104 return array.collect(self.forbidden:items());
108 -- get a list of possible SASL mechanims to use
109 function method:mechanisms()
110 local mechanisms = {}
111 for backend, f in pairs(self.profile) do
112 if backend_mechanism[backend] then
113 for _, mechanism in ipairs(backend_mechanism[backend]) do
114 if not sasl_i.forbidden:contains(mechanism) then
115 mechanisms[mechanism] = true;
120 self["possible_mechanisms"] = mechanisms;
121 return array.collect(keys(mechanisms));
124 -- select a mechanism to use
125 function method:select(mechanism)
130 self.mech_i = mechanisms[mechanism]
131 if self.mech_i == nil then
137 -- feed new messages to process into the library
138 function method:process(message)
139 --if message == "" or message == nil then return "failure", "malformed-request" end
140 return self.mech_i(self, message);
143 -- load the mechanisms
144 load_mechs = {"plain", "digest-md5", "anonymous", "scram"}
145 for _, mech in ipairs(load_mechs) do
146 local name = "util.sasl."..mech;
147 local m = require(name);
148 m.init(registerMechanism)