diff options
Diffstat (limited to 'util')
| -rw-r--r-- | util/sasl.lua | 303 | ||||
| -rw-r--r-- | util/sasl/anonymous.lua | 35 | ||||
| -rw-r--r-- | util/sasl/digest-md5.lua | 232 | ||||
| -rw-r--r-- | util/sasl/plain.lua | 55 |
4 files changed, 406 insertions, 219 deletions
diff --git a/util/sasl.lua b/util/sasl.lua index b6fc6d66..c8aa16a2 100644 --- a/util/sasl.lua +++ b/util/sasl.lua @@ -16,9 +16,8 @@ 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 pairs, ipairs = pairs, ipairs; local t_insert, t_concat = table.insert, table.concat; -local to_byte, to_char = string.byte, string.char; local to_unicode = require "util.encodings".idna.to_unicode; local s_match = string.match; local gmatch = string.gmatch @@ -27,244 +26,110 @@ local math = require "math" local type = type local error = error local print = print +local setmetatable = setmetatable; +local assert = assert; +local dofile = dofile; +local require = require; -module "sasl" - --- 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 - self.username = authentication - local auth_success = self.credentials_handler("PLAIN", self.username, self.realm, password) +require "util.iterators" +local keys = keys - 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, credentials_handler) - --TODO complete support for authzid +local array = require "util.array" +module "sasl" - local function serialize(message) - local data = "" +--[[ +Authentication Backend Prototypes: - if type(message) ~= "table" then error("serialize needs an argument of type table.") end +state = false : disabled +state = true : enabled +state = nil : non-existant - -- 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["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end - data = data:gsub(",$", "") - return data +plain: + function(username, realm) + return password, state; 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 +plain-test: + function(username, realm, password) + return true or false, state; + 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); +digest-md5: + function(username, domain, realm, encoding) -- domain and realm are usually the same; for some broken + -- implementations it's not + return digesthash, state; 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); + +digest-md5-test: + function(username, domain, realm, encoding, digesthash) + return true or false, state; end - local function parse(data) - local message = {} - for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder - message[k] = v; - end - return message; +]] + +local method = {}; +method.__index = method; +local mechanisms = {}; +local backend_mechanism = {}; + +-- register a new SASL mechanims +local function registerMechanism(name, backends, f) + assert(type(name) == "string", "Parameter name MUST be a string."); + assert(type(backends) == "string" or type(backends) == "table", "Parameter backends MUST be either a string or a table."); + assert(type(f) == "function", "Parameter f MUST be a function."); + mechanisms[name] = f + for _, backend_name in ipairs(backends) do + if backend_mechanism[backend_name] == nil then backend_mechanism[backend_name] = {}; end + t_insert(backend_mechanism[backend_name], name); end +end - 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, - qop = "auth", - charset = "utf-8", - algorithm = "md5-sess", - realm = self.realm}); - return "challenge", challenge; - elseif (self.step == 2) then - local response = parse(message); - -- check for replay attack - 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"; - else - -- 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 - 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.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 = ""; - if response.authzid then - if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then - -- COMPAT - log("warn", "Client is violating RFC 3920 (section 6.1, point 7)."); - A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid; - else - return "failure", "invalid-authzid"; - 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 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); +-- create a new SASL object which can be used to authenticate clients +function new(realm, profile) + sasl_i = {profile = profile}; + sasl_i.realm = realm; + return setmetatable(sasl_i, method); +end - 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." +-- get a list of possible SASL mechanims to use +function method:mechanisms() + local mechanisms = {} + for backend, f in pairs(self.profile) do + print(backend) + if backend_mechanism[backend] then + for _, mechanism in ipairs(backend_mechanism[backend]) do + mechanisms[mechanism] = true; end - elseif self.step == 3 then - if self.authenticated ~= nil then return "success" - else return "failure", "malformed-request" end end end - return object; + self["possible_mechanisms"] = mechanisms; + return array.collect(keys(mechanisms)); end --- 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 - object["username"] = generate_uuid() - return object +-- select a mechanism to use +function method:select(mechanism) + if self.mech_i then + return false; + end + + self.mech_i = mechanisms[mechanism] + if self.mech_i == nil then + return false; + end + return true; end +-- feed new messages to process into the library +function method:process(message) + --if message == "" or message == nil then return "failure", "malformed-request" end + return self.mech_i(self, message); +end -function new(mechanism, realm, credentials_handler) - local object - 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 - end - return object +-- load the mechanisms +load_mechs = {"plain", "digest-md5", "anonymous"} +for _, mech in ipairs(load_mechs) do + local name = "util.sasl."..mech; + local m = require(name); + m.init(registerMechanism) end return _M; diff --git a/util/sasl/anonymous.lua b/util/sasl/anonymous.lua new file mode 100644 index 00000000..8f2a7708 --- /dev/null +++ b/util/sasl/anonymous.lua @@ -0,0 +1,35 @@ +-- 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 s_match = string.match; + +local log = require "util.logger".init("sasl"); + +module "anonymous" + +--========================= +--SASL ANONYMOUS according to RFC 4505 +local function anonymous(self, message) + local username; + repeat + username = generate_uuid(); + until self.profile.anonymous(username, self.realm); + self["username"] = username; + return "success" +end + +function init(registerMechanism) + registerMechanism("ANONYMOUS", {"anonymous"}, anonymous); +end + +return _M;
\ No newline at end of file diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua new file mode 100644 index 00000000..a4a4f811 --- /dev/null +++ b/util/sasl/digest-md5.lua @@ -0,0 +1,232 @@ +-- 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 tostring = tostring; +local type = type; + +local s_gmatch = string.gmatch; +local s_match = string.match; +local t_concat = table.concat; +local t_insert = table.insert; +local to_byte, to_char = string.byte, string.char; + +local md5 = require "util.hashes".md5; +local log = require "util.logger".init("sasl"); +local generate_uuid = require "util.uuid".generate; + +module "plain" + +--========================= +--SASL DIGEST-MD5 according to RFC 2831 +local function digest_response() + + return response, A1, A2 +end + +local function digest(self, message) + --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["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 + 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 s_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) + local message = {} + for k, v in s_gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder + message[k] = v; + end + return message; + end + + if not self.nonce then + self.nonce = generate_uuid(); + self.step = 0; + self.nonce_count = {}; + end + + self.step = self.step + 1; + if (self.step == 1) then + local challenge = serialize({ nonce = self.nonce, + qop = "auth", + charset = "utf-8", + algorithm = "md5-sess", + realm = self.realm}); + return "challenge", challenge; + elseif (self.step == 2) then + local response = parse(message); + -- check for replay attack + 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"; + else + -- 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 + 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"]; + if self.profile.plain then + local password, state = self.profile.plain(response["username"], self.realm) + if state == nil then return "failure", "not-authorized" + elseif state == false then return "failure", "account-disabled" end + Y = md5(response["username"]..":"..response["realm"]..":"..password); + elseif self.profile["digest-md5"] then + local Y, state = self.profile["digest-md5"](response["username"], self.realm, response["realm"], response["charset"]) + if state == nil then return "failure", "not-authorized" + elseif state == false then return "failure", "account-disabled" end + elseif self.profile["digest-md5-test"] then + -- TODO + end + --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 = ""; + if response.authzid then + if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then + -- COMPAT + log("warn", "Client is violating RFC 3920 (section 6.1, point 7)."); + A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid; + else + return "failure", "invalid-authzid"; + 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 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; + --TODO: considering sending the rspauth in a success node for saving one roundtrip; allowed according to http://tools.ietf.org/html/draft-saintandre-rfc3920bis-09#section-7.3.6 + 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 + if self.authenticated ~= nil then return "success" + else return "failure", "malformed-request" end + end +end + +function init(registerMechanism) + registerMechanism("DIGEST-MD5", {"plain"}, digest); +end + +return _M;
\ No newline at end of file diff --git a/util/sasl/plain.lua b/util/sasl/plain.lua new file mode 100644 index 00000000..08056053 --- /dev/null +++ b/util/sasl/plain.lua @@ -0,0 +1,55 @@ +-- 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 s_match = string.match; + +module "plain" + +--========================= +--SASL PLAIN according to RFC 4616 +local function plain(self, message) + 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 correct, state = false, false; + if self.profile.plain then + local correct_password; + correct_password, state = self.profile.plain(authentication, self.realm); + if correct_password == password then correct = true; else correct = false; end + elseif self.profile.plain_test then + correct, state = self.profile.plain_test(authentication, self.realm, password); + end + + self.username = authentication + if not state then + return "failure", "account-disabled"; + end + + if correct then + return "success"; + else + return "failure", "not-authorized"; + end +end + +function init(registerMechanism) + registerMechanism("PLAIN", {"plain", "plain_test"}, plain); +end + +return _M;
\ No newline at end of file |