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-rw-r--r--util/sasl.lua105
1 files changed, 50 insertions, 55 deletions
diff --git a/util/sasl.lua b/util/sasl.lua
index f2ff6592..1f4eff54 100644
--- a/util/sasl.lua
+++ b/util/sasl.lua
@@ -8,6 +8,7 @@ local st = require "util.stanza";
local generate_uuid = require "util.uuid".generate;
local s_match = string.match;
local gmatch = string.gmatch
+local string = string
local math = require "math"
local type = type
local error = error
@@ -32,39 +33,14 @@ local function new_plain(onAuth, onSuccess, onFail, onWrite)
self.onSuccess(authentication)
else
self.onWrite(st.stanza("failure", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):tag("temporary-auth-failure"));
+ self.onFail("Wrong password.")
end
end
return object
end
-
---[[
-SERVER:
-nonce="3145176401",qop="auth",charset=utf-8,algorithm=md5-sess
-
-CLIENT: username="tobiasfar",nonce="3145176401",cnonce="pJiW7hzeZLvOSAf7gBzwTzLWe4obYOVDlnNESzQCzGg=",nc=00000001,digest-uri="xmpp/jabber.org",qop=auth,response=99a93ba75235136e6403c3a2ba37089d,charset=utf-8
-
-username="tobias",nonce="4406697386",cnonce="wUnT7vYrOB0V8D/lKd5bhpaNCk+hLJwc8T4CBCqp7WM=",nc=00000001,digest-uri="xmpp/luaetta.ath.cx",qop=auth,response=d202b8a1bdf8204816fb23c5f87b6b63,charset=utf-8
-
-SERVER:
-rspauth=ab66d28c260e97da577ce3aac46a8991
-]]--
local function new_digest_md5(onAuth, onSuccess, onFail, onWrite)
- local function H(s)
- return md5.sum(s)
- end
-
- local function KD(k, s)
- return H(k..":"..s)
- end
-
- local function HEX(n)
- return md5.sumhexa(n)
- end
-
- local function HMAC(k, s)
- return crypto.hmac.digest("md5", s, k, true)
- end
+ --TODO maybe support for authzid
local function serialize(message)
local data = ""
@@ -76,15 +52,18 @@ local function new_digest_md5(onAuth, onSuccess, onFail, onWrite)
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.algorith.."," end
+ if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
+ if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
data = data:gsub(",$", "")
return data
end
local function parse(data)
message = {}
- for k, v in gmatch(data, [[([%w%-]+)="?([%w%-%/%.]+)"?,?]]) do
+ log("debug", "parse-message: "..data)
+ for k, v in gmatch(data, [[([%w%-]+)="?([%w%-%/%.%+=]+)"?,?]]) do
message[k] = v
+ log("debug", " "..k.." = "..v)
end
return message
end
@@ -93,8 +72,8 @@ local function new_digest_md5(onAuth, onSuccess, onFail, onWrite)
onWrite = onWrite }
--TODO: something better than math.random would be nice, maybe OpenSSL's random number generator
- object.nonce = math.random(0, 9)
- for i = 1, 9 do object.nonce = object.nonce..math.random(0, 9) end
+ object.nonce = generate_uuid()
+ log("debug", "SASL nonce: "..object.nonce)
object.step = 1
object.nonce_count = {}
local challenge = base64.encode(serialize({ nonce = object.nonce,
@@ -103,6 +82,7 @@ local function new_digest_md5(onAuth, onSuccess, onFail, onWrite)
algorithm = "md5-sess"} ));
object.onWrite(st.stanza("challenge", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):text(challenge))
object.feed = function(self, stanza)
+ log("debug", "SASL step: "..self.step)
if stanza.name ~= "response" and stanza.name ~= "auth" then self.onFail("invalid-stanza-tag") end
if stanza.attr.xmlns ~= "urn:ietf:params:xml:ns:xmpp-sasl" then self.onFail("invalid-stanza-namespace") end
if stanza.name == "auth" then return end
@@ -110,62 +90,77 @@ local function new_digest_md5(onAuth, onSuccess, onFail, onWrite)
if (self.step == 2) then
local response = parse(base64.decode(stanza[1]))
-- check for replay attack
- if response["nonce-count"] then
- if self.nonce_count[response["nonce-count"]] then self.onFail("not-authorized") end
+ if response["nc"] then
+ if self.nonce_count[response["nc"]] then self.onFail("not-authorized") end
end
-- check for username, it's REQUIRED by RFC 2831
if not response["username"] then
self.onFail("malformed-request")
end
+ self["username"] = response["username"]
-- check for nonce, ...
if not response["nonce"] then
self.onFail("malformed-request")
else
-- check if it's the right nonce
- if response["nonce"] ~= self.nonce then self.onFail("malformed-request") end
+ if response["nonce"] ~= tostring(self.nonce) then self.onFail("malformed-request") end
end
if not response["cnonce"] then self.onFail("malformed-request") end
if not response["qop"] then response["qop"] = "auth" end
- local hostname = ""
+ if response["realm"] == nil then response["realm"] = "" end
+
+ local domain = ""
local protocol = ""
if response["digest-uri"] then
- protocol, hostname = response["digest-uri"]:match("(%w+)/(.*)$")
+ protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$")
else
error("No digest-uri")
end
-- compare response_value with own calculation
--local A1 = usermanager.get_md5(response["username"], hostname)..":"..response["nonce"]..response["cnonce"]
- local A1 = H("tobias:luaetta.ath.cx:tobias")..":"..response["nonce"]..response["cnonce"]
- local A2 = "AUTHENTICATE:"..response["digest-uri"]
- local response_value = HEX(KD(HEX(H(A1)), response["nonce"]..":"..response["nonce-count"]..":"..response["cnonce-value"]..":"..response["qop"]..":"..HEX(H(A2))))
+ --FIXME actual username and password here :P
+ local X = "tobias:"..response["realm"]..":tobias"
+ local Y = md5.sum(X)
+ local A1 = Y..":"..response["nonce"]..":"..response["cnonce"]--:authzid
+ local A2 = "AUTHENTICATE:"..protocol.."/"..domain
- log("debug", "response_value: "..response_value);
+ local HA1 = md5.sumhexa(A1)
+ local HA2 = md5.sumhexa(A2)
- if response["qop"] == "auth" then
+ local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
+ local response_value = md5.sumhexa(KD)
+ log("debug", "response_value: "..response_value);
+ log("debug", "response: "..response["response"]);
+ if response_value == response["response"] then
+ -- calculate rspauth
+ A2 = ":"..protocol.."/"..domain
+
+ HA1 = md5.sumhexa(A1)
+ HA2 = md5.sumhexa(A2)
+
+ KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
+ local rspauth = md5.sumhexa(KD)
+
+ self.onWrite(st.stanza("challenge", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):text(base64.encode(serialize({rspauth = rspauth}))))
else
-
+ self.onWrite(st.stanza("response", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}))
+ self.onFail()
+ end
+ elseif self.step == 3 then
+ if stanza.name == "response" then
+ self.onWrite(st.stanza("success", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}))
+ self.onSuccess(self.username)
+ else
+ self.onFail("Third step isn't a response stanza.")
end
-
- --local response_value = HEX(KD(HEX(H(A1)), response["nonce"]..":"..response["nonce-count"]..":"..response["cnonce-value"]..":"..response["qop"]..":"..HEX(H(A2))))
-
end
- --[[
- local authorization = s_match(response, "([^&%z]+)")
- local authentication = s_match(response, "%z([^&%z]+)%z")
- local password = s_match(response, "%z[^&%z]+%z([^&%z]+)")
- if self.onAuth(authentication, password) == true then
- self.onWrite(st.stanza("success", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}))
- self.onSuccess(authentication)
- else
- self.onWrite(st.stanza("failure", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):tag("temporary-auth-failure"));
- end]]--
end
return object
end
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 19:45:56 +0000