-- sasl.lua v0.4
-- Copyright (C) 2008-2009 Tobias Markmann
---
+--
-- All rights reserved.
---
+--
-- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
---
+--
-- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
-- * 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.
-- * 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.
---
+--
-- 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.
module "sasl"
-local function new_plain(realm, password_handler)
- local object = { mechanism = "PLAIN", realm = realm, password_handler = password_handler}
+-- Credentials handler:
+-- Arguments: ("PLAIN", user, host, password)
+-- Returns: true (success) | false (fail) | nil (user unknown)
+local function new_plain(realm, credentials_handler)
+ local object = { mechanism = "PLAIN", realm = realm, credentials_handler = credentials_handler}
function object.feed(self, message)
-
if message == "" or message == nil then return "failure", "malformed-request" end
local response = message
local authorization = s_match(response, "([^&%z]+)")
local authentication = s_match(response, "%z([^&%z]+)%z")
local password = s_match(response, "%z[^&%z]+%z([^&%z]+)")
-
- if authentication == nil or password == nil then return "failure", "malformed-request" end
-
- 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
-
- local claimed_password = ""
- if password_encoding == nil then claimed_password = password
- else claimed_password = password_encoding(password) end
-
- self.username = authentication
- if claimed_password == correct_password then
- return "success"
- else
- return "failure", "not-authorized"
- end
- end
- return object
-end
+ if authentication == nil or password == nil then return "failure", "malformed-request" end
+ self.username = authentication
+ local auth_success = self.credentials_handler("PLAIN", self.username, self.realm, password)
+
+ if auth_success then
+ return "success"
+ elseif auth_success == nil then
+ return "failure", "account-disabled"
+ else
+ return "failure", "not-authorized"
+ end
+ end
+ return object
+end
+-- credentials_handler:
+-- Arguments: (mechanism, node, domain, realm, decoder)
+-- Returns: Password encoding, (plaintext) password
-- implementing RFC 2831
-local function new_digest_md5(realm, password_handler)
+local function new_digest_md5(realm, credentials_handler)
--TODO complete support for authzid
local function serialize(message)
local data = ""
-
+
if type(message) ~= "table" then error("serialize needs an argument of type table.") end
-
+
-- testing all possible values
+ if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
if message["charset"] then data = data..[[charset=]]..message.charset.."," end
if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
- if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
data = data:gsub(",$", "")
return data
end
-
+
local function utf8tolatin1ifpossible(passwd)
local i = 1;
while i <= #passwd do
return message;
end
- local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler};
-
+ local object = { mechanism = "DIGEST-MD5", realm = realm, credentials_handler = credentials_handler};
+
object.nonce = generate_uuid();
object.step = 0;
object.nonce_count = {};
-
+
function object.feed(self, message)
self.step = self.step + 1;
if (self.step == 1) then
- local challenge = serialize({ nonce = object.nonce,
+ local challenge = serialize({ nonce = object.nonce,
qop = "auth",
charset = "utf-8",
algorithm = "md5-sess",
if response["nc"] then
if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
end
-
+
-- check for username, it's REQUIRED by RFC 2831
if not response["username"] then
return "failure", "malformed-request";
end
self["username"] = response["username"];
-
+
-- check for nonce, ...
if not response["nonce"] then
return "failure", "malformed-request";
-- check if it's the right nonce
if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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 or response["realm"] == "" then
response["realm"] = "";
elseif response["realm"] ~= self.realm then
return "failure", "not-authorized", "Incorrect realm value";
end
-
+
local decoder;
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.";
end
-
+
local domain = "";
local protocol = "";
if response["digest-uri"] then
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"], to_unicode(domain), response["realm"], "DIGEST-MD5", decoder);
+ local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
if Y == nil then return "failure", "not-authorized"
elseif Y == false then return "failure", "account-disabled" end
local A1 = "";
A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
end
local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
-
+
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);
-
+
if response_value == response["response"] then
-- calculate rspauth
A2 = ":"..protocol.."/"..domain;
-
+
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});
else
return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
- end
+ end
elseif self.step == 3 then
if self.authenticated ~= nil then return "success"
else return "failure", "malformed-request" end
return object;
end
-local function new_anonymous(realm, password_handler)
- local object = { mechanism = "ANONYMOUS", realm = realm, password_handler = password_handler}
+-- Credentials handler: Can be nil. If specified, should take the mechanism as
+-- the only argument, and return true for OK, or false for not-OK (TODO)
+local function new_anonymous(realm, credentials_handler)
+ local object = { mechanism = "ANONYMOUS", realm = realm, credentials_handler = credentials_handler}
function object.feed(self, message)
return "success"
end
end
-function new(mechanism, realm, password_handler)
+function new(mechanism, realm, credentials_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)
+ if mechanism == "PLAIN" then object = new_plain(realm, credentials_handler)
+ elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, credentials_handler)
+ elseif mechanism == "ANONYMOUS" then object = new_anonymous(realm, credentials_handler)
else
log("debug", "Unsupported SASL mechanism: "..tostring(mechanism));
return nil
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