NAME
nss_tacplus – TACACS+ nsswitch module
SYNOPSIS
passwd: files tacplus
DESCRIPTION
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.
SEE ALSO
HISTORY
The nss_tacplus module and this manual page were written by Dag-Erling Smørgrav ⟨[email protected]⟩ for Klara Systems.