--- sasl.lua v0.2
--- Copyright (C) 2008 Tobias Markmann
+-- sasl.lua v0.4
+-- Copyright (C) 2008-2009 Tobias Markmann
--
-- All rights reserved.
--
local type = type
local error = error
local print = print
-local idna_ascii = require "util.encodings".idna.to_ascii
-local idna_unicode = require "util.encodings".idna.to_unicode
module "sasl"
if authentication == nil or password == nil then return "failure", "malformed-request" end
- local password_encoding, correct_password = self.password_handler(authentication, self.realm, "PLAIN")
+ local password_encoding, correct_password = self.password_handler(authentication, self.realm, self.realm, "PLAIN")
if correct_password == nil then return "failure", "not-authorized"
elseif correct_password == false then return "failure", "account-disabled" end
return object
end
+
+-- implementing RFC 2831
local function new_digest_md5(realm, password_handler)
- --TODO maybe support for authzid
+ --TODO complete support for authzid
local function serialize(message)
local data = ""
local function parse(data)
message = {}
for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
- message[k] = v
+ message[k] = v;
end
- return message
+ return message;
end
- local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler}
+ local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler};
- --TODO: something better than math.random would be nice, maybe OpenSSL's random number generator
- object.nonce = generate_uuid()
- object.step = 0
- object.nonce_count = {}
+ object.nonce = generate_uuid();
+ object.step = 0;
+ object.nonce_count = {};
function object.feed(self, message)
- self.step = self.step + 1
+ self.step = self.step + 1;
if (self.step == 1) then
local challenge = serialize({ nonce = object.nonce,
qop = "auth",
charset = "utf-8",
algorithm = "md5-sess",
realm = self.realm});
- return "challenge", challenge
+ return "challenge", challenge;
elseif (self.step == 2) then
- local response = parse(message)
+ local response = parse(message);
-- check for replay attack
if response["nc"] then
if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
-- check for username, it's REQUIRED by RFC 2831
if not response["username"] then
- return "failure", "malformed-request"
+ return "failure", "malformed-request";
end
- self["username"] = response["username"]
+ self["username"] = response["username"];
-- check for nonce, ...
if not response["nonce"] then
- return "failure", "malformed-request"
+ return "failure", "malformed-request";
else
-- check if it's the right nonce
if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
if not response["qop"] then response["qop"] = "auth" end
- if response["realm"] == nil then
+ if response["realm"] == nil or response["realm"] == "" then
response["realm"] = "";
- elseif response["realm"] ~= self.realm and response["realm"] ~= "" then
+ elseif response["realm"] ~= self.realm then
return "failure", "not-authorized", "Incorrect realm value";
end
if response["charset"] == nil then
decoder = utf8tolatin1ifpossible;
elseif response["charset"] ~= "utf-8" then
- return "failure", "incorrect-encoding", "The client's response uses "..response["charset"].." for encoding with isn't supported by sasl.lua. Supported encodings are latin or utf-8."
+ return "failure", "incorrect-encoding", "The client's response uses "..response["charset"].." for encoding with isn't supported by sasl.lua. Supported encodings are latin or utf-8.";
end
- local domain = ""
- local protocol = ""
+ local domain = "";
+ local protocol = "";
if response["digest-uri"] then
- protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$")
+ protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
if protocol == nil or domain == nil then return "failure", "malformed-request" end
else
return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
end
--TODO maybe realm support
- self.username = response["username"]
- local password_encoding, Y = self.password_handler(response["username"], response["realm"], "DIGEST-MD5", decoder)
+ self.username = response["username"];
+ local password_encoding, Y = self.password_handler(response["username"], domain, response["realm"], "DIGEST-MD5", decoder);
if Y == nil then return "failure", "not-authorized"
elseif Y == false then return "failure", "account-disabled" end
-
- local A1 = Y..":"..response["nonce"]..":"..response["cnonce"]--:authzid
+ local A1 = "";
+ if response.authzid then
+ if response.authzid == self.username.."@"..self.realm then
+ -- COMPAT
+ log("warn", "Client is violating XMPP RFC. See section 6.1 of RFC 3920.");
+ A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
+ else
+ A1 = "?";
+ end
+ else
+ A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
+ end
local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
- local HA1 = md5(A1, true)
- local HA2 = md5(A2, true)
+ local HA1 = md5(A1, true);
+ local HA2 = md5(A2, true);
- local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
- local response_value = md5(KD, true)
+ local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
+ local response_value = md5(KD, true);
if response_value == response["response"] then
-- calculate rspauth
A2 = ":"..protocol.."/"..domain;
- HA1 = md5(A1, true)
- HA2 = md5(A2, true)
+ HA1 = md5(A1, true);
+ HA2 = md5(A2, true);
KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
- local rspauth = md5(KD, true)
- self.authenticated = true
- return "challenge", serialize({rspauth = rspauth})
+ local rspauth = md5(KD, true);
+ self.authenticated = true;
+ return "challenge", serialize({rspauth = rspauth});
else
return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
end
else return "failure", "malformed-request" end
end
end
+ return object;
+end
+
+local function new_anonymous(realm, password_handler)
+ local object = { mechanism = "ANONYMOUS", realm = realm, password_handler = password_handler}
+ function object.feed(self, message)
+ return "success"
+ end
+ object["username"] = generate_uuid()
return object
end
+
function new(mechanism, realm, password_handler)
local object
if mechanism == "PLAIN" then object = new_plain(realm, password_handler)
elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, password_handler)
+ elseif mechanism == "ANONYMOUS" then object = new_anonymous(realm, password_handler)
else
log("debug", "Unsupported SASL mechanism: "..tostring(mechanism));
return nil
projects / prosody.git / blobdiff