do_auth8
Program allowing more granular control than tac_plus.
Usage
do_auth -u
user
[-i
Ip
Address]
[-d
Device
address]
[-f
Config
filename]
[-l
Log
file]
[-D
Debug
mode]
Overview
do_auth is a python program written to work as an authorization script for tacacs to allow greater flexability in tacacs authentication. It allows a user to be part of many predefined groups that can allow different access to different devices based on ip, user, and source address.
Groups are assigned to users in the [users] section. A user must be assigned to one or more groups, one per line. Groups are defined in brackets, but can be any name. Each group can have up to 6 options as defined below.
host_deny Deny any user coming from this host. Optional.
host_allow Allow users from this range. Mandatory with -i.
device_deny Deny any device with this IP. Optional.
device_permit Allow this range. Mandatory if -d is specified.
command_deny Deny these commands. Optional.
command_permit Allow these commands. Mandatory.
The options are parsed in order till a match is found. Obviously, for login, the commands section is not parsed. If a match is not found, or a deny is found, we move on to the next group. At the end, we have an implicit deny if no groups match. All tacacs keys passed on login to do_auth are returned. (except cmd*) It is possible to modify them, but I haven't implemented this yet as I don't need it. Future versions may have an av_pair & append_av_pair option.
Options
-
-u -
Username. Mandatory. $user
-
-i -
Ip address of user. Optional. If not specified, all host_ entries are ignored and can be omitted. $address
-
-d -
Device address. Optional. If not specified, all device_ entries are ignored and can be omitted. $name
-
-f -
Config Filename. Default is do_auth.ini.
-
-l -
Logfile. Default is log.txt.
-
-D -
Activate debug mode.
Examples
do_auth -i $address -u $user -d $name -l /var/log/do_auth.log -f /etc/tacacs+/do_auth.ini
Exit status
do_auth returns 0 to allow, 1 to deny authorization.