# HG changeset patch
# User Tobias Markmann <tm@ayena.de>
# Date 1258493958 -3600
# Node ID d18b4d22b8dad8e9d450b3c8c63549a705b6ad31
# Parent  1509cabb8321fa965771477630e1b8f3d4a47c83
Making interop with libpurple. (Thanks darkrain).

diff -r 1509cabb8321 -r d18b4d22b8da util/sasl.lua
--- a/util/sasl.lua	Tue Nov 17 11:31:59 2009 +0100
+++ b/util/sasl.lua	Tue Nov 17 22:39:18 2009 +0100
@@ -125,7 +125,7 @@
 end
 
 -- load the mechanisms
-load_mechs = {"plain", "digest-md5", "anonymous"}
+load_mechs = {"plain", "digest-md5", "anonymous", "scram"}
 for _, mech in ipairs(load_mechs) do
 	local name = "util.sasl."..mech;
 	local m = require(name);
diff -r 1509cabb8321 -r d18b4d22b8da util/sasl/scram.lua
--- a/util/sasl/scram.lua	Tue Nov 17 11:31:59 2009 +0100
+++ b/util/sasl/scram.lua	Tue Nov 17 22:39:18 2009 +0100
@@ -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 @@
 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 @@
 
 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 @@
 	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 @@
 		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 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.";