From 5554c334177b01d969cd5feb4d73ec2af0c80e7a Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Thu, 12 Nov 2009 21:57:37 +0100 Subject: Move each mechanism in an own file. --- util/sasl/digest-md5.lua | 194 +++++++++++++++++++++++++++++++++++++++++++++++ util/sasl/plain.lua | 53 +++++++++++++ 2 files changed, 247 insertions(+) create mode 100644 util/sasl/digest-md5.lua create mode 100644 util/sasl/plain.lua (limited to 'util/sasl') diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua new file mode 100644 index 00000000..8acbce4b --- /dev/null +++ b/util/sasl/digest-md5.lua @@ -0,0 +1,194 @@ +-- 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. + + +--========================= +--SASL DIGEST-MD5 according to RFC 2831 +local function sasl_mechanism_digest_md5(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 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 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 = 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.."@"..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 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 + elseif self.step == 3 then + if self.authenticated ~= nil then return "success" + else return "failure", "malformed-request" end + end +end \ No newline at end of file diff --git a/util/sasl/plain.lua b/util/sasl/plain.lua new file mode 100644 index 00000000..898657f0 --- /dev/null +++ b/util/sasl/plain.lua @@ -0,0 +1,53 @@ +-- 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 registerMechanism = registerMechanism + +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 + +registerMechanism("PLAIN", {"plain", "plain_test"}, plain); + +return _M; \ No newline at end of file -- cgit v1.2.3 From 72e185fa03df69754ea24322db832e85b015c379 Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Fri, 13 Nov 2009 09:21:19 +0100 Subject: Getting PLAIN mechanism work with the new API. --- util/sasl/plain.lua | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'util/sasl') diff --git a/util/sasl/plain.lua b/util/sasl/plain.lua index 898657f0..08056053 100644 --- a/util/sasl/plain.lua +++ b/util/sasl/plain.lua @@ -11,7 +11,7 @@ -- -- 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 registerMechanism = registerMechanism +local s_match = string.match; module "plain" @@ -48,6 +48,8 @@ local function plain(self, message) end end -registerMechanism("PLAIN", {"plain", "plain_test"}, plain); +function init(registerMechanism) + registerMechanism("PLAIN", {"plain", "plain_test"}, plain); +end return _M; \ No newline at end of file -- cgit v1.2.3 From ed841d20a7881697a28a5497067df53f128348e3 Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Fri, 13 Nov 2009 10:54:17 +0100 Subject: Add support for plain profile in digest-md5 implementation. --- util/sasl/digest-md5.lua | 51 ++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 43 insertions(+), 8 deletions(-) (limited to 'util/sasl') diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua index 8acbce4b..1ff0f62b 100644 --- a/util/sasl/digest-md5.lua +++ b/util/sasl/digest-md5.lua @@ -11,10 +11,29 @@ -- -- 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 sasl_mechanism_digest_md5(self, message) +local function digest_response() + + return response, A1, A2 +end + +local function digest(self, message) --TODO complete support for authzid local function serialize(message) @@ -68,7 +87,7 @@ local function sasl_mechanism_digest_md5(self, message) end local function latin1toutf8(str) local p = {}; - for ch in gmatch(str, ".") do + for ch in s_gmatch(str, ".") do ch = to_byte(ch); if (ch < 0x80) then t_insert(p, to_char(ch)); @@ -82,7 +101,7 @@ local function sasl_mechanism_digest_md5(self, message) end local function parse(data) local message = {} - for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder + for k, v in s_gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder message[k] = v; end return message; @@ -96,7 +115,7 @@ local function sasl_mechanism_digest_md5(self, message) self.step = self.step + 1; if (self.step == 1) then - local challenge = serialize({ nonce = object.nonce, + local challenge = serialize({ nonce = self.nonce, qop = "auth", charset = "utf-8", algorithm = "md5-sess", @@ -150,9 +169,19 @@ local function sasl_mechanism_digest_md5(self, message) --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 + 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"]..":"..self.realm..":"..password); + elseif self.profile["digest-md5"] then + --local Y, state = self.profile["digest-md5"](response["username"], self.realm, response["charset"]) + elseif self.profile["digest-md5-test"] then + + 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.."@"..self.realm then @@ -191,4 +220,10 @@ local function sasl_mechanism_digest_md5(self, message) if self.authenticated ~= nil then return "success" else return "failure", "malformed-request" end end -end \ No newline at end of file +end + +function init(registerMechanism) + registerMechanism("DIGEST-MD5", {"plain"}, digest); +end + +return _M; \ No newline at end of file -- cgit v1.2.3 From f66117f6255fa37f0e049131ade72232251c32f1 Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Fri, 13 Nov 2009 11:10:06 +0100 Subject: Broken DIGEST-MD5 client support again. --- util/sasl/digest-md5.lua | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'util/sasl') diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua index 1ff0f62b..df0a5b47 100644 --- a/util/sasl/digest-md5.lua +++ b/util/sasl/digest-md5.lua @@ -173,11 +173,11 @@ local function digest(self, message) 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"]..":"..self.realm..":"..password); + 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["charset"]) 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" -- cgit v1.2.3 From 8c36b99f27aaa438ce12c8183df357d3c6bd916d Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Fri, 13 Nov 2009 11:24:22 +0100 Subject: Adding support for digest-md5 profile in DIGEST-MD5 implementation. --- util/sasl/digest-md5.lua | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'util/sasl') diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua index df0a5b47..3f50e232 100644 --- a/util/sasl/digest-md5.lua +++ b/util/sasl/digest-md5.lua @@ -175,7 +175,9 @@ local function digest(self, message) 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["charset"]) + 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 -- cgit v1.2.3 From 9a77245fd19b2421169ed765b4820678073fade2 Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Fri, 13 Nov 2009 14:31:03 +0100 Subject: Adding a note for possible round trip savings. --- util/sasl/digest-md5.lua | 1 + 1 file changed, 1 insertion(+) (limited to 'util/sasl') diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua index 3f50e232..ba042933 100644 --- a/util/sasl/digest-md5.lua +++ b/util/sasl/digest-md5.lua @@ -214,6 +214,7 @@ local function digest(self, message) 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." -- cgit v1.2.3 From 9a1b93edc7b012cc75a0f4bf5a5fe64cd300f6d8 Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Tue, 17 Nov 2009 00:56:41 +0100 Subject: Initial commit of SCRAM SASL mechanism. --- util/sasl/scram.lua | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 util/sasl/scram.lua (limited to 'util/sasl') diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua new file mode 100644 index 00000000..b7507f3e --- /dev/null +++ b/util/sasl/scram.lua @@ -0,0 +1,90 @@ +-- 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 base64 = require "util.encodings".base64; +local xor = require "bit".bxor +local hmac_sha1 = require "util.hmac".sha1; +local sha1 = require "util.hashes".sha1; + +module "plain" + +--========================= +--SASL SCRAM-SHA-1 according to draft-ietf-sasl-scram-10 +local default_i = 4096 + +local function bp( b ) + local result = "" + for i=1, b:len() do + result = result.."\\"..b:byte(i) + end + return result +end + +local function binaryXOR( a, b ) + if string.len(a) > string.len(b) then + b = string.rep("\0", a:len() - b:len())..b + elseif string.len(a) < string.len(b) then + a = string.rep("\0", b:len() - a:len())..a + end + local result = "" + for i=1, a:len() do + result = result..string.char(xor(a:byte(i), b:byte(i))) + end + return result +end + +-- hash algorithm independent Hi(PBKDF2) implementation +local function Hi(hmac, str, salt, i) + local Ust = hmac(str, salt.."\0\0\0\1"); + local res = Ust; + for n=1,i-1 do + Und = hmac(str, Ust) + res = binaryXOR(res, Und) + Ust = Und + end + return res +end + +local function validate_username(username) + -- check for forbidden char sequences + + -- replace =2D with , and =3D with = + + -- apply SASLprep + return username; +end + +local function scram_sha_1(self, message) + if not self.state then self["state"] = {} end + + if not self.state.name then + -- we are processing client_first_message + self.state["name"] = string.match(client_first_message, "n=(.+),r=") + self.state["clientnonce"] = string.match(client_first_message, "r=([^,]+)") + + self.state.name = validate_username(self.state.name); + if not self.state.name then + return "failure", "malformed-request"; + end + else + -- we are processing client_final_message + end +end + +function init(registerMechanism) + registerMechanism("SCRAM-SHA-1", {"plain"}, scram_sha_1); +end + +return _M; \ No newline at end of file -- cgit v1.2.3 From edd37a1e348c6f989351cc9b682bbbae4f6a2a1c Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Tue, 17 Nov 2009 09:33:15 +0100 Subject: Added missing require for generate_uuid. --- util/sasl/anonymous.lua | 1 + 1 file changed, 1 insertion(+) (limited to 'util/sasl') diff --git a/util/sasl/anonymous.lua b/util/sasl/anonymous.lua index 8f2a7708..65650294 100644 --- a/util/sasl/anonymous.lua +++ b/util/sasl/anonymous.lua @@ -14,6 +14,7 @@ local s_match = string.match; local log = require "util.logger".init("sasl"); +local generate_uuid = require "util.uuid".generate; module "anonymous" -- cgit v1.2.3 From 1fa16fc88c2492df997fa5471eb282e977602c25 Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Tue, 17 Nov 2009 11:03:54 +0100 Subject: Completed SCRAM-SHA-1 implementation to a ready-to-test state. --- util/sasl/scram.lua | 44 +++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 41 insertions(+), 3 deletions(-) (limited to 'util/sasl') diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua index b7507f3e..9362cca7 100644 --- a/util/sasl/scram.lua +++ b/util/sasl/scram.lua @@ -17,6 +17,7 @@ local base64 = require "util.encodings".base64; local xor = require "bit".bxor local hmac_sha1 = require "util.hmac".sha1; local sha1 = require "util.hashes".sha1; +local generate_uuid = require "util.uuid".generate; module "plain" @@ -71,15 +72,52 @@ local function scram_sha_1(self, message) if not self.state.name then -- we are processing client_first_message - self.state["name"] = string.match(client_first_message, "n=(.+),r=") - self.state["clientnonce"] = string.match(client_first_message, "r=([^,]+)") + local client_first_message = message; + self.state["name"] = client_first_message:match("n=(.+),r=") + self.state["clientnonce"] = client_first_message:match("r=([^,]+)") self.state.name = validate_username(self.state.name); - if not self.state.name then + if not self.state.name or not self.state.clientnonce then return "failure", "malformed-request"; end + self.state["servernonce"] = generate_uuid(); + self.state["salt"] = generate_uuid(); + + local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..default_i; + return "challenge", server_first_message else -- we are processing client_final_message + local client_final_message = message; + + self.state["proof"] = client_final_message:match("p=(.+)"); + self.state["nonce"] = client_final_message:match("r=(.+),p="); + self.state["channelbinding"] = client_final_message:match("c=(.+),r="); + if not self.state.proof or not self.state.nonce or not self.state.channelbinding then + return "failure", "malformed-request"; + end + + local password; + if self.profile.plain then + password, state = self.profile.plain(self.state.name, self.realm) + if state == nil then return "failure", "not-authorized" + elseif state == false then return "failure", "account-disabled" end + end + + local SaltedPassword = Hi(hmac_sha1, password, self.state.salt, default_i) + local ClientKey = hmac_sha1(SaltedPassword, "Client Key") + local ServerKey = hmac_sha1(SaltedPassword, "Server Key") + local StoredKey = sha1(ClientKey) + local AuthMessage = "n=" .. s_match(client_first_message,"n=(.+)") .. "," .. server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+") + local ClientSignature = hmac_sha1(StoredKey, AuthMessage) + local ClientProof = binaryXOR(ClientKey, ClientSignature) + local ServerSignature = hmac_sha1(ServerKey, AuthMessage) + + if base64.encode(ClientProof) == self.state.proof then + local server_final_message = "v="..base64.encode(ServerSignature); + return "success", server_final_message; + else + return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."; + end end end -- cgit v1.2.3 From 12c7adc2e7a748941853a43102ec73e07d51850b Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Tue, 17 Nov 2009 11:31:59 +0100 Subject: Add check for forbidden char sequences in validate_username(). --- util/sasl/scram.lua | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'util/sasl') diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua index 9362cca7..c3bc9600 100644 --- a/util/sasl/scram.lua +++ b/util/sasl/scram.lua @@ -60,7 +60,8 @@ end local function validate_username(username) -- check for forbidden char sequences - + for eq in s:gmatch("=(.?.?)") do + if eq ~= "2D" and eq ~= "3D" then return false end end return true; -- replace =2D with , and =3D with = -- apply SASLprep -- cgit v1.2.3 From b0f89bf88505895e77bfda26c0e2720c14bf2918 Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Tue, 17 Nov 2009 22:39:18 +0100 Subject: Making interop with libpurple. (Thanks darkrain). --- util/sasl/scram.lua | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) (limited to 'util/sasl') diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua index c3bc9600..a347e2f3 100644 --- a/util/sasl/scram.lua +++ b/util/sasl/scram.lua @@ -12,7 +12,8 @@ -- 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 type = type +local string = string local base64 = require "util.encodings".base64; local xor = require "bit".bxor local hmac_sha1 = require "util.hmac".sha1; @@ -34,7 +35,7 @@ local function bp( b ) end local function binaryXOR( a, b ) - if string.len(a) > string.len(b) then + if a:len() > b:len() then b = string.rep("\0", a:len() - b:len())..b elseif string.len(a) < string.len(b) then a = string.rep("\0", b:len() - a:len())..a @@ -60,8 +61,12 @@ end local function validate_username(username) -- check for forbidden char sequences - for eq in s:gmatch("=(.?.?)") do - if eq ~= "2D" and eq ~= "3D" then return false end end return true; + for eq in username:gmatch("=(.?.?)") do + if eq ~= "2D" and eq ~= "3D" then + return false + end + end + -- replace =2D with , and =3D with = -- apply SASLprep @@ -74,6 +79,7 @@ local function scram_sha_1(self, message) if not self.state.name then -- we are processing client_first_message local client_first_message = message; + self.state["client_first_message"] = client_first_message; self.state["name"] = client_first_message:match("n=(.+),r=") self.state["clientnonce"] = client_first_message:match("r=([^,]+)") @@ -85,8 +91,10 @@ local function scram_sha_1(self, message) self.state["salt"] = generate_uuid(); local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..default_i; + self.state["server_first_message"] = server_first_message; return "challenge", server_first_message else + if type(message) ~= "string" then return "failure", "malformed-request" end -- we are processing client_final_message local client_final_message = message; @@ -108,13 +116,14 @@ local function scram_sha_1(self, message) local ClientKey = hmac_sha1(SaltedPassword, "Client Key") local ServerKey = hmac_sha1(SaltedPassword, "Server Key") local StoredKey = sha1(ClientKey) - local AuthMessage = "n=" .. s_match(client_first_message,"n=(.+)") .. "," .. server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+") + local AuthMessage = "n=" .. s_match(self.state.client_first_message,"n=(.+)") .. "," .. self.state.server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+") local ClientSignature = hmac_sha1(StoredKey, AuthMessage) local ClientProof = binaryXOR(ClientKey, ClientSignature) local ServerSignature = hmac_sha1(ServerKey, AuthMessage) if base64.encode(ClientProof) == self.state.proof then local server_final_message = "v="..base64.encode(ServerSignature); + self["username"] = self.state.name; return "success", server_final_message; else return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."; -- cgit v1.2.3 From 7815630d28c0ffe23c63c54eeb4f401252b61d0f Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Wed, 18 Nov 2009 11:59:50 +0100 Subject: SASLprep usernames and passwords. --- util/sasl/scram.lua | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'util/sasl') diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua index a347e2f3..7d60ef86 100644 --- a/util/sasl/scram.lua +++ b/util/sasl/scram.lua @@ -19,6 +19,8 @@ local xor = require "bit".bxor local hmac_sha1 = require "util.hmac".sha1; local sha1 = require "util.hashes".sha1; local generate_uuid = require "util.uuid".generate; +local saslprep = require "util.encodings".stringprep.saslprep; +local log = require "util.logger".init("sasl"); module "plain" @@ -70,6 +72,7 @@ local function validate_username(username) -- replace =2D with , and =3D with = -- apply SASLprep + username = saslprep(username); return username; end @@ -83,10 +86,16 @@ local function scram_sha_1(self, message) self.state["name"] = client_first_message:match("n=(.+),r=") self.state["clientnonce"] = client_first_message:match("r=([^,]+)") - self.state.name = validate_username(self.state.name); if not self.state.name or not self.state.clientnonce then return "failure", "malformed-request"; end + + self.state.name = validate_username(self.state.name); + if not self.state.name then + log("debug", "Username violates either SASLprep or contains forbidden character sequences.") + return "failure", "malformed-request"; + end + self.state["servernonce"] = generate_uuid(); self.state["salt"] = generate_uuid(); @@ -110,6 +119,11 @@ local function scram_sha_1(self, message) password, state = self.profile.plain(self.state.name, self.realm) if state == nil then return "failure", "not-authorized" elseif state == false then return "failure", "account-disabled" end + password = saslprep(password); + if not password then + log("debug", "Password violates SASLprep."); + return "failure", "not-authorized" + end end local SaltedPassword = Hi(hmac_sha1, password, self.state.salt, default_i) -- cgit v1.2.3 From fd57560a965a70db6591a5847a12dc320c2cdf0f Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Wed, 18 Nov 2009 22:02:32 +0100 Subject: SASLprep authentication and password in SASL PLAIN implementation. --- util/sasl/plain.lua | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'util/sasl') diff --git a/util/sasl/plain.lua b/util/sasl/plain.lua index 08056053..d9fdb9a2 100644 --- a/util/sasl/plain.lua +++ b/util/sasl/plain.lua @@ -12,6 +12,8 @@ -- 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 saslprep = require "util.encodings".stringprep.saslprep; +local log = require "util.logger".init("sasl"); module "plain" @@ -26,6 +28,14 @@ local function plain(self, message) if authentication == nil or password == nil then return "failure", "malformed-request"; end + + -- SASLprep password and authentication + authentication = saslprep(authentication); + password = saslprep(password); + + if (not password) or (password == "") or (not authentication) or (authentication == "") then + log("debug", "Username or password violates either SASLprep."); + end local correct, state = false, false; if self.profile.plain then -- cgit v1.2.3 From 6117baa28d8658b16a4de88f4183bef42bed8e0a Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Thu, 19 Nov 2009 00:04:14 +0100 Subject: Handle , and = in usernames for SCRAM. --- util/sasl/scram.lua | 2 ++ 1 file changed, 2 insertions(+) (limited to 'util/sasl') diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua index 7d60ef86..a7b21d0d 100644 --- a/util/sasl/scram.lua +++ b/util/sasl/scram.lua @@ -70,6 +70,8 @@ local function validate_username(username) end -- replace =2D with , and =3D with = + username:gsub("=2D", ","); + username:gsub("=3D", "="); -- apply SASLprep username = saslprep(username); -- cgit v1.2.3 From d5511aa898fea7f142f3b61799ea0724b4b8877f Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Thu, 19 Nov 2009 15:29:09 +0100 Subject: Typo. --- util/sasl/digest-md5.lua | 2 +- util/sasl/scram.lua | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'util/sasl') diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua index a4a4f811..1429a5c6 100644 --- a/util/sasl/digest-md5.lua +++ b/util/sasl/digest-md5.lua @@ -24,7 +24,7 @@ local md5 = require "util.hashes".md5; local log = require "util.logger".init("sasl"); local generate_uuid = require "util.uuid".generate; -module "plain" +module "digest-md5" --========================= --SASL DIGEST-MD5 according to RFC 2831 diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua index a7b21d0d..f7b8300a 100644 --- a/util/sasl/scram.lua +++ b/util/sasl/scram.lua @@ -22,7 +22,7 @@ local generate_uuid = require "util.uuid".generate; local saslprep = require "util.encodings".stringprep.saslprep; local log = require "util.logger".init("sasl"); -module "plain" +module "scram" --========================= --SASL SCRAM-SHA-1 according to draft-ietf-sasl-scram-10 -- cgit v1.2.3 From 547b733736f76dac6fce0757ec73742377f5f99b Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Thu, 19 Nov 2009 17:08:58 +0100 Subject: Fail if username or password don't pass SASLprep. --- util/sasl/plain.lua | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'util/sasl') diff --git a/util/sasl/plain.lua b/util/sasl/plain.lua index d9fdb9a2..5c7ff68a 100644 --- a/util/sasl/plain.lua +++ b/util/sasl/plain.lua @@ -34,7 +34,8 @@ local function plain(self, message) password = saslprep(password); if (not password) or (password == "") or (not authentication) or (authentication == "") then - log("debug", "Username or password violates either SASLprep."); + log("debug", "Username or password violates SASLprep."); + return "failure", "malformed-request"; end local correct, state = false, false; -- cgit v1.2.3 From b32b0e118daa6a32b464bf21e7c091041eec0dbb Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Thu, 19 Nov 2009 17:17:52 +0100 Subject: Adding some human readable error messages. --- util/sasl/plain.lua | 4 ++-- util/sasl/scram.lua | 6 +++--- 2 files changed, 5 insertions(+), 5 deletions(-) (limited to 'util/sasl') diff --git a/util/sasl/plain.lua b/util/sasl/plain.lua index 5c7ff68a..46a86bb9 100644 --- a/util/sasl/plain.lua +++ b/util/sasl/plain.lua @@ -35,7 +35,7 @@ local function plain(self, message) if (not password) or (password == "") or (not authentication) or (authentication == "") then log("debug", "Username or password violates SASLprep."); - return "failure", "malformed-request"; + return "failure", "malformed-request", "Invalid username or password."; end local correct, state = false, false; @@ -55,7 +55,7 @@ local function plain(self, message) if correct then return "success"; else - return "failure", "not-authorized"; + return "failure", "not-authorized", "Unable to authorize you with the authentication credentials you've sent."; end end diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua index f7b8300a..4413e2a6 100644 --- a/util/sasl/scram.lua +++ b/util/sasl/scram.lua @@ -95,7 +95,7 @@ local function scram_sha_1(self, message) self.state.name = validate_username(self.state.name); if not self.state.name then log("debug", "Username violates either SASLprep or contains forbidden character sequences.") - return "failure", "malformed-request"; + return "failure", "malformed-request", "Invalid username."; end self.state["servernonce"] = generate_uuid(); @@ -113,7 +113,7 @@ local function scram_sha_1(self, message) self.state["nonce"] = client_final_message:match("r=(.+),p="); self.state["channelbinding"] = client_final_message:match("c=(.+),r="); if not self.state.proof or not self.state.nonce or not self.state.channelbinding then - return "failure", "malformed-request"; + return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message."; end local password; @@ -124,7 +124,7 @@ local function scram_sha_1(self, message) password = saslprep(password); if not password then log("debug", "Password violates SASLprep."); - return "failure", "not-authorized" + return "failure", "not-authorized", "Invalid password." end end -- cgit v1.2.3 From 315e7ac799abb96f627be4c5b27648f007b89be7 Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Thu, 19 Nov 2009 17:20:38 +0100 Subject: Reduce needed roundtrips during DIGEST-MD5 login. --- util/sasl/digest-md5.lua | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'util/sasl') diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua index 1429a5c6..e80ed63a 100644 --- a/util/sasl/digest-md5.lua +++ b/util/sasl/digest-md5.lua @@ -214,8 +214,7 @@ local function digest(self, message) 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}); + return "success", serialize({rspauth = rspauth}); else return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated." end -- cgit v1.2.3 From 212ef3eca2cb953331e3d41d07c37b2812e6e0b9 Mon Sep 17 00:00:00 2001 From: Tobias Markmann Date: Wed, 25 Nov 2009 19:46:22 +0100 Subject: SASL: Using locally mapped s_gmatch instead of unavailable gmatch. --- util/sasl/digest-md5.lua | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'util/sasl') diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua index 557858b3..f8e0e393 100644 --- a/util/sasl/digest-md5.lua +++ b/util/sasl/digest-md5.lua @@ -102,7 +102,7 @@ local function digest(self, message) local function parse(data) local message = {} -- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0") - for k, v in gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder + for k, v in s_gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder message[k] = v; end return message; -- cgit v1.2.3