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User authentication
TACACS+ user configuration
When configured to use TACACS+ support, the Connect IT Mini device uses a remote TACACS+ server
for user authentication (password verification) and authorization (assigning the access level of the
user). Additional TACACS+ servers can be configured as backup servers for user authentication.
This section outlines how to configure a TACACS+ server to be used for user authentication on your
Connect IT Mini device.
Example TACACS+ configuration
With TACACS+, users are defined in the server configuration file. On Ubuntu, the default location and
filename for the server configuration file is /etc/tacacs+/tac_plus.conf.
Note
TACACS+ configuration, including filenames and locations, may vary depending on your platform
and installation. This example assumes a Ubuntu installation.
To define users:
1. Open the TACACS+ server configuration file in a text editor. For example:
$ sudo gedit /etc/tacacs+/tac_plus.conf
2. Add users to the file using the following format. This example will create two users, one with
admin and serial access, and one with only serial access.
user = user1 {
name ="User1 for Connect IT Mini"
pap = cleartext password1
service = system {
groupname = admin,serial
}
}
user = user2 {
name ="User2 for Connect IT Mini"
pap = cleartext password2
service = system {
groupname = serial
}
}
The groupname attribute is optional. If used, the value must correspond to authentication
groups configured on your Connect IT Mini. Alternatively, if the user is also configured as a local
user on the Connect IT Mini device and the LDAP server authenticates the user but does not
return any groups, the local configuration determines the list of groups. See
groups
for more information about authentication groups. The groupname attribute can
contain one group or multiple groups in a comma-separated list.
3. Save and close the file.
4. Verify that your changes did not introduce any syntax errors:
$ sudo tac_plus -C /etc/tacacs+/tac_plus.conf -P
If successful, this command will echo the configuration file to standard out. If the command
encounters any syntax errors, a message similar to this will display:
Digi Connect IT® Mini User Guide
Terminal Access Controller Access-Control System Plus (TACACS+)
Authentication
413
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