+-- 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.
-local md5 = require "md5"
+
+local md5 = require "util.hashes".md5;
local log = require "util.logger".init("sasl");
local tostring = tostring;
local st = require "util.stanza";
local generate_uuid = require "util.uuid".generate;
+local t_insert, t_concat = table.insert, table.concat;
+local to_byte, to_char = string.byte, string.char;
local s_match = string.match;
local gmatch = string.gmatch
local string = string
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"
local function new_plain(realm, password_handler)
local object = { mechanism = "PLAIN", realm = realm, password_handler = password_handler}
- object.feed = function(self, message)
- --print(message:gsub("%W", function (c) return string.format("\\%d", string.byte(c)) end));
-
- 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]+)")
-
- local password_encoding, correct_password = self.password_handler(authentication, self.realm, "PLAIN")
-
- 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
- log("debug", "success")
- return "success"
- else
- log("debug", "failure")
- return "failure", "not-authorized"
- end
- end
+ 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, "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
return data
end
+ local function utf8tolatin1ifpossible(passwd)
+ local i = 1;
+ while i <= #passwd do
+ local passwd_i = to_byte(passwd:sub(i, i));
+ if passwd_i > 0x7F then
+ if passwd_i < 0xC0 or passwd_i > 0xC3 then
+ return passwd;
+ end
+ i = i + 1;
+ passwd_i = to_byte(passwd:sub(i, i));
+ if passwd_i < 0x80 or passwd_i > 0xBF then
+ return passwd;
+ end
+ end
+ i = i + 1;
+ end
+
+ local p = {};
+ local j = 0;
+ i = 1;
+ while (i <= #passwd) do
+ local passwd_i = to_byte(passwd:sub(i, i));
+ if passwd_i > 0x7F then
+ i = i + 1;
+ local passwd_i_1 = to_byte(passwd:sub(i, i));
+ t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
+ else
+ t_insert(p, to_char(passwd_i));
+ end
+ i = i + 1;
+ end
+ return t_concat(p);
+ end
+ local function latin1toutf8(str)
+ local p = {};
+ for ch in gmatch(str, ".") do
+ ch = to_byte(ch);
+ if (ch < 0x80) then
+ t_insert(p, to_char(ch));
+ elseif (ch < 0xC0) then
+ t_insert(p, to_char(0xC2, ch));
+ else
+ t_insert(p, to_char(0xC3, ch - 64));
+ end
+ end
+ return t_concat(p);
+ end
local function parse(data)
message = {}
- log("debug", "parse-message: "..data)
- for k, v in gmatch(data, [[([%w%-]+)="?([%w%-%/%.%+=]+)"?,?]]) do
+ for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
message[k] = v
- log("debug", " "..k.." = "..v)
end
return message
end
object.nonce_count = {}
function object.feed(self, message)
- log("debug", "SASL step: "..self.step)
self.step = self.step + 1
if (self.step == 1) then
local challenge = serialize({ nonce = object.nonce,
charset = "utf-8",
algorithm = "md5-sess",
realm = self.realm});
- log("debug", "challenge: "..challenge)
return "challenge", challenge
elseif (self.step == 2) then
local response = parse(message)
if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
end
- if not response["cnonce"] 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 response["realm"] = "" end
+ if response["realm"] == nil or response["realm"] == "" then
+ response["realm"] = self.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
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")
+ local password_encoding, Y = self.password_handler(response["username"], 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 A2 = "AUTHENTICATE:"..protocol.."/"..domain
+ local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
- local HA1 = md5.sumhexa(A1)
- local HA2 = md5.sumhexa(A2)
+ 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.sumhexa(KD)
+ local response_value = md5(KD, true)
- log("debug", "response_value: "..response_value);
- log("debug", "response: "..response["response"]);
if response_value == response["response"] then
-- calculate rspauth
- A2 = ":"..protocol.."/"..domain
+ A2 = ":"..protocol.."/"..domain;
- HA1 = md5.sumhexa(A1)
- HA2 = md5.sumhexa(A2)
+ HA1 = md5(A1, true)
+ HA2 = md5(A2, true)
KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
- local rspauth = md5.sumhexa(KD)
-
+ 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
elseif self.step == 3 then
- return "success"
+ if self.authenticated ~= nil then return "success"
+ 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
+ --TODO: From XEP-0175 "It is RECOMMENDED for the node identifier to be a UUID as specified in RFC 4122 [5]." So util.uuid() should (or have an option to) behave as specified in RFC 4122.
+ 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
return object
end
-return _M;
\ No newline at end of file
+return _M;
projects / prosody.git / blobdiff