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-rw-r--r--util/sasl.lua71
1 files changed, 41 insertions, 30 deletions
diff --git a/util/sasl.lua b/util/sasl.lua
index a36aa9ca..54715613 100644
--- a/util/sasl.lua
+++ b/util/sasl.lua
@@ -60,8 +60,10 @@ local function new_plain(realm, password_handler)
return object
end
+
+-- implementing RFC 2831
local function new_digest_md5(realm, password_handler)
- --TODO maybe support for authzid
+ --TODO complete support for authzid
local function serialize(message)
local data = ""
@@ -129,29 +131,29 @@ local function new_digest_md5(realm, password_handler)
local function parse(data)
message = {}
for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
- message[k] = v
+ message[k] = v;
end
- return message
+ return message;
end
- local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler}
+ local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler};
--TODO: something better than math.random would be nice, maybe OpenSSL's random number generator
- object.nonce = generate_uuid()
- object.step = 0
- object.nonce_count = {}
+ object.nonce = generate_uuid();
+ object.step = 0;
+ object.nonce_count = {};
function object.feed(self, message)
- self.step = self.step + 1
+ 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
+ return "challenge", challenge;
elseif (self.step == 2) then
- local response = parse(message)
+ local response = parse(message);
-- check for replay attack
if response["nc"] then
if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
@@ -159,13 +161,13 @@ local function new_digest_md5(realm, password_handler)
-- check for username, it's REQUIRED by RFC 2831
if not response["username"] then
- return "failure", "malformed-request"
+ return "failure", "malformed-request";
end
- self["username"] = response["username"]
+ self["username"] = response["username"];
-- check for nonce, ...
if not response["nonce"] then
- return "failure", "malformed-request"
+ return "failure", "malformed-request";
else
-- check if it's the right nonce
if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
@@ -184,44 +186,53 @@ local function new_digest_md5(realm, password_handler)
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."
+ 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 = ""
+ local domain = "";
+ local protocol = "";
if response["digest-uri"] then
- protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$")
+ protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
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"]
+ self.username = response["username"];
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 A1 = "";
+ if response.authzid then
+ if response.authzid == self.username.."@"..self.realm then
+ 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 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)
+ 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)
+ 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})
+ 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
@@ -230,7 +241,7 @@ local function new_digest_md5(realm, password_handler)
else return "failure", "malformed-request" end
end
end
- return object
+ return object;
end
local function new_anonymous(realm, password_handler)