TACACs implementation from many moons ago
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Type Name Latest commit message Commit time
Failed to load latest commit information.
jnetlib
.gitignore
README.md

README.md

Java Network Library

built to encompass such things as Cisco's TACACS protocol -- by @Jay_Colson

Cisco TACACS protocol information

/**
 * @author Jay_Colson, Copyright 2000
 * @version v0.10, 06/13/2000
 */
packet construction:

HEADER
4 bits - major version (0xc)
4 bits - minor version (0x0 default, 0x1 minor_ver_one)
8 bits - type (0x01 authentication, 0x02 authorization, 0x03 accounting)
8 bits - seq_no (first packet must be 1, clients only send odd, server sends even)
8 bits - flags (0x01 is unencrypted flag, 0x04 is single connect flag)
32 bits - session_id (id for session, does not change for duration, random generated)
32 bits - length (length of packet BODY, not including the HEADER)

BODY
Authentication START packet
	8 bits - action (0x01 Login, 0x02 Chpass, 0x04 Sendauth)
	8 bits - priv_lvl (0x0f Max, 0x00 Min)
	8 bits - authen_type (0x01 ascii, 0x02 pap, 0x03 chap, 0x04 arap, 0x05 mschap)
	8 bits - service (0x00 nonw, 0x01 login, 0x02 enable, 0x03 ppp, ....)
	8 bits - user_len 
	8 bits - port_len
	8 bits - rem-addr_len
	8 bits - data_len
	? bits - user (username optional in START packet)
	? bits - port (ascii name of client port - tty01)
	? bits - rem_addr (ascii string desc client remote location)
	? bits - data (used to send data for action and authen_type)
	
Authentication REPLY packet
	8 bits - status (0x01 pass, 0x02 fail, 0x03 getdata, 0x04 getuser, 0x05 getpass, 0x06 restart, 0x07 error, 0x21 follow)
	8 bits - flags (0x01 noecho)
	16 bits - server_msg_len
	16 bits - data_len
	? bits - server_msg (message to be displayed to user, optional)
	? bits - data (data intended for NAS, not user)
	
Authentication CONTINUE packet
	16 bits - user_msg_len
	16 bits - data_len
	8 bits - flags (0x01 abort)
	? bits - user_msg (data user/NAS responds with to server_msg from REPLY)
	? bits - data (used to send data for action and authen_type)