You can configure NIOS to authenticate admins against TACACS+ (Terminal Access Controller Access-Control System Plus) servers. TACACS+ provides separate authentication, authorization, and accounting services. To ensure reliable delivery, it uses TCP as its transport protocol, and to ensure confidentiality, all protocol exchanges between the TACACS+ server and its clients are encrypted. For detailed information about TACACS+, refer to the Internet draft
http://tools.ietf.org/html/draft-grant-tacacs-02.
In addition, you can configure a custom service, infoblox, on the TACACS+ server, and then define a user group and specify the group name in the custom attribute infoblox-admin-group. Ensure that you apply the user group to the custom service infoblox. On NIOS, you define a group with the same name and add it to the authentication policy.
Then when the TACACS+ server responds to an authentication and authorization request and includes the infoblox-admin-group attribute, NIOS can match the group name with the group in the authentication policy and automatically assign the admin to that group.
Figure 4.7 illustrates the TACACS+ authentication and authorization process when PAP/CHAP authentication is used.
Figure 4.7 TACACS+ Authentication | Drawio |
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| TACACS+ Accounting |
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| TACACS+ Accounting |
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TACACS+ Accounting When you enable TACACS+ accounting, NIOS sends the TACACS+ accounting server a TACACS+ accounting event with the same information that it sends to the Audit Log for any user command/event. NIOS sends an accounting start packet when a user first logs in successfully using TACACS+ authentication, and it sends an accounting STOP packet when a user logs out of the GUI or CLI or when a GUI or CLI session times out. If a product restarts or software failure occurs, NIOS drops any outstanding accounting packets. Note that audit log entries that are greater than 3,600 characters are truncated in accounting events sent to TACAS+ servers.
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