Need help to fix client connection

[/dev/not/null]

This is my python wow server emulator for 2.4.3. Currently client stucks on 'Connected' after SMSG_AUTH_RESPONSE.
Help me please with debugging the problem.

As I can see from wireshark client sends nothing after SMSG_AUTH_RESPONSE, but I wish it should send CMSG_CHAR_ENUM.

[drolean]

i believe your problem is here wowcore/AuthSessionManager.py at 878f24ff0ad3f6776dcab6d2a42c659134b93f04 . sergio-ivanuzzo/wowcore . GitHub

this packet must be transmitted with encrypt header

[/dev/not/null]

i believe your problem is here wowcore/AuthSessionManager.py at 878f24ff0ad3f6776dcab6d2a42c659134b93f04 . sergio-ivanuzzo/wowcore . GitHub

this packet must be transmitted with encrypt header

Unfortunately, even when encryption is set before SMSG_AUTH_RESPONSE, this not help. Client still stucks on 'Connected'.
When I connecting, this output from wow client console:

GRUNT: state: LOGIN_STATE_CONNECTING result: LOGIN_OK
GRUNT: state: LOGIN_STATE_CONNECTED result: LOGIN_OK 127.0.0.1:3724
GRUNT: state: LOGIN_STATE_AUTHENTICATING result: LOGIN_OK
GRUNT: state: LOGIN_STATE_CHECKSUM result: LOGIN_OK
GRUNT: state: LOGIN_STATE_HANDSHAKING result: LOGIN_OK
GRUNT: state: LOGIN_STATE_AUTHENTICATED result: LOGIN_OK
ClientConnection Initiating: COP_CONNECT code=CSTATUS_CONNECTING
ClientConnection Completed: COP_CONNECT code=RESPONSE_CONNECTED result=TRUE
ClientConnection Initiating: COP_AUTHENTICATE code=CSTATUS_AUTHENTICATING
GRUNT: state: LOGIN_STATE_DISCONNECTED result: LOGIN_OK

Client returns GRUNT: state: LOGIN_STATE_DISCONNECTED result: LOGIN_OK because LoginServer close connection after returning Realmlist.
When I leave connection alive, wow client console returns next output:

GRUNT: state: LOGIN_STATE_CONNECTING result: LOGIN_OK
GRUNT: state: LOGIN_STATE_CONNECTED result: LOGIN_OK 127.0.0.1:3724
GRUNT: state: LOGIN_STATE_AUTHENTICATING result: LOGIN_OK
GRUNT: state: LOGIN_STATE_CHECKSUM result: LOGIN_OK
GRUNT: state: LOGIN_STATE_HANDSHAKING result: LOGIN_OK
GRUNT: state: LOGIN_STATE_AUTHENTICATED result: LOGIN_OK
ClientConnection Initiating: COP_CONNECT code=CSTATUS_CONNECTING
ClientConnection Completed: COP_CONNECT code=RESPONSE_CONNECTED result=TRUE
ClientConnection Initiating: COP_AUTHENTICATE code=CSTATUS_AUTHENTICATING

After that client hangs on 'Connected' too, but with another console output.

[/dev/not/null]

Well, after thinking and debugging I know what the reason now. Client stucks on 'Connected' because of my encryption alg is not correct. Python byte value should be in range of (0, 256), so my encryption code had to take this limitation. My code below:

class HeaderCrypt(object):

    ENCRYPT_HEADER_SIZE = 4
    DECRYPT_HEADER_SIZE = 6

    def __init__(self, session_key):
        self.session_key = session_key
        self.send_i = 0
        self.send_j = 0
        self.recv_i = 0
        self.recv_j = 0

    def encrypt(self, data):
        assert len(data) >= HeaderCrypt.ENCRYPT_HEADER_SIZE
        encrypted_header = [0] * HeaderCrypt.ENCRYPT_HEADER_SIZE

        for index in range(HeaderCrypt.ENCRYPT_HEADER_SIZE):
            enc = (data[index] ^ self.session_key[self.send_i]) + self.send_j
            enc %= 0x100
            encrypted_header[index] = self.send_j = enc
            self.send_i = (self.send_i + 1) % len(self.session_key)

        return bytes(encrypted_header) + data[HeaderCrypt.ENCRYPT_HEADER_SIZE:]

    def decrypt(self, data):
        assert len(data) >= HeaderCrypt.DECRYPT_HEADER_SIZE
        decrypted_header = [0] * HeaderCrypt.DECRYPT_HEADER_SIZE

        for index in range(self.DECRYPT_HEADER_SIZE):
            dec = (data[index] - self.recv_j) ^ self.session_key[self.recv_i]
            dec %= 0x100
            decrypted_header[index] = dec
            self.recv_j = data[index]
            self.recv_i = (self.recv_i + 1) % len(self.session_key)

        return bytes(decrypted_header) + data[HeaderCrypt.DECRYPT_HEADER_SIZE:]

Now I'm trying to understand how to fix my alg. Any help would be appreciated.

[/dev/not/null]

Solved this! All I need (according to Mangos source code) is adding key generating:

    def _generate_key(self, session_key):
        seed = b'8\xa7\x83\x15\xf8\x92%0q\x98g\xb1\x8c\x04\xe2\xaa'
        hashed = hmac.new(seed, session_key, sha1)
        return hashed.digest()

This is the key for HeaderCrypt.