nss_tacplus8

Usage

Overview

The nss_tacplus module is a loadable NSS module which provides a minimal identity service using a TACACS+ backend.

Due to the limitations of the TACACS+ protocol, the functionality provided by the nss_tacplus module is very limited: it can look up a user by name, but not by uid, and it cannot enumerate users.

To look up a user, the nss_tacplus module submits an authorization request with authentication method TAC_PLUS_AUTHEN_METH_NOT_SET, authentication type TAC_PLUS_AUTHEN_TYPE_NOT_SET, and authentication service TAC_PLUS_AUTHEN_SVC_LOGIN, for the “shell” service. If the response status is either TAC_PLUS_AUTHOR_STATUS_PASS_ADD or TAC_PLUS_AUTHOR_STATUS_PASS_REPL, the user is considered to exist and the nss_tacplus module fills out a struct passwd for it.

The following attributes, if included in the response from the TACACS+ server, are used to construct the response:

UID

Numeric user ID. Must be between 0 and UID_MAX. Defaults to 65534.

GID

Numeric primary group ID. Must be between 0 and GID_MAX. Defaults to 65534.

CLASS

Login class. Left blank if not provided.

GECOS

Display name. If not provided, the user name is used instead.

HOME

Home directory. Defaults to /.

SHELL

Shell. Defaults to /bin/sh.

Case is ignored when matching attribute names. If an attribute is included multiple times, the last value takes effect.