tacplus_servers.5

.TH tacplus_servers 5
.\" Copyright 2017,2018 Cumulus Networks, Inc.  All rights reserved.
.SH NAME
/etc/tacplus_servers \- TACACS+ client configuration file
.SH SYNOPSIS
.B /etc/tacplus_servers
is a common configuration file for the tacplus client libraries and tools.
.SH DESCRIPTION
Providing a common configuration file for the tacplus client tools and libraries
simplifies configuration.  For most uses, this is the only configuration file
that needs to be modified to enable TACACS+ client use.
.PP
By default, all components read this file, enabling a single point of
configuration for the TACACS server(s), debug settings, etc.
.PP
Because this file contains the shared secret key(s), it should not have
world read permissions (it should be mode 600 and owned by root) in order
to be secure.
This means that some components (such as NSS) may not be able to read this
file when running as non-root users; these components have additional
configuration files for that reason.  Typically the
.B secret
keyword should not be used in those files, unless they are also not world-readable.
.PP
There are also additional configuration files that apply to the separate
components.
.PP
Not all components use all variables; some configuration variables are
ignored by one or more components.
.PP
.TP
.I debug=Number
Output debugging information via syslog(3).
Debugging is heavy, including passwords. Do not leave debugging enabled on a production switch once you have completed troubleshooting.  Currently most components only check to see if it is non-zero.  Some components will print additional debug if set to
.BR 2 .
.TP
.I  "server=IP_ADDRESS | HOSTNAME"
Adds a TACACS+ server to the servers list. Servers will be queried in turn
until a match is found, or no servers remain in the list. Can be specified up
to 7 times.  When the IP_ADDR form is used, it can be optionally followed by a
port number, preceded by a ":".  The default port is 49.  An IP address is
preferred, rather than a hostname, since some components may start prior to
networking.  May occur in any order with the
.I secret
parameter (below).
.TP
.I secret=STRING
Secret key used to encrypt/decrypt packets sent to/received from the server.
Can be specified more than once, and can be in any order with respect to the
server= parameter.   When fewer
.I secret
parameters are specified than
.I server
parameters, the last secret given is used for each of the remaining servers.
This parameter should only be put into files such as /etc/tacplus_servers that
are not world readable.
.TP
.I source_ip=IPv4_ADDRESS
Set the IPv4 address used as the source IP address when communicating with
the TACACS+ server.  IPv6 addresses are not supported, nor are hostnames.
The address must work when passsed to the
.BR bind ()
system call, that is, it must be valid for interface being used.
.TP
.I timeout=SECONDS
Sets the TACACS+ server(s) per-connection timeout. The default value is 10 seconds.
During login, there are usually at least 4 connections made to the TACACS+
server, so a server that is down could lead to multiple timeouts.
The libnss functionality typically sets a smaller timeout in it's
own configuration file
.IR /etc/tacplus_nss.conf .
.TP
.I login=STRING
TACACS+ authentication service (pap, chap, or login). The default value is pap.
.TP
.I acct_all=1
Configuration option for audisp_tacplus and pam_tacplus sending accounting records to all supplied servers (1), or the first server to respond (0). The default value is 1.
When sending accounting records, the record is sent to all servers in the list if
acct_all=1, which is the default.  Set to
.B 0
if the accounting records should only be sent to the first server that responds.
This is also normally used by the
.I audisp-tacplus
per-command accounting daemon, because it's default configuration file sources this file.
.TP
.I user_homedir=1
This is not enabled by default.   When enabled, separate home directories for
each TACACS+ user are created when the TACACS+ user first logs in.  By default
the home directory in the mapping accounts in
.I /etc/passwd
(/home/tacacs0 ... /home/tacacs15) are used.
This is not honored for accounts with restricted shells (when per-command
authorization is enabled).  When set, if the home directory does not exist, it
is created with the
.I mkhomedir_helper
program, in the same manner as pam_mkhomedir.
.TP
.I vrf=VRFNAME
If the management network is in a VRF, set this variable to the VRF name. This
would  usually  be  "mgmt".  When this variable is set, the connection to the
TACACS+ accounting servers is made through the named VRF.  The client processes
must be restarted after this is changed.  Because the NSS libraries become part
of processes such as sshd, this typically requires a reboot.
.TP
.I service=shell
TACACS+ accounting and authorization service. Examples include shell, pap,
ppp, and slip.
The default value is shell.
.TP
.I protocol=ssh
TACACS+ protocol field. This option is use dependent.
PAM uses the SSH protocol.
.TP
.I include=/file/name
Open the listed file, and continue to read configuration from that file,
if the open is successful.  This avoids duplication of configuration information.
A maximum of 8 configuration files may be used.
.SH "SEE ALSO"
.BR tacplus_nss.conf (5),
.BR audisp-tacplus (8),
.BR pam_mkhomedir (8),
.BR tacplus-auth (8),
.BR tacplus-restrict (8)
.SH FILES
.I /etc/audisp/plugins.d/audisp-tacplus.conf
- audisp plugin configuration
.br
.I /etc/audisp/audisp-tac_plus.conf
- tacplus client configuration file for accounting.  Any of the variables in
this manual page may be added to this file, if you only want them to affect
the TACACS+ accounting.
.br
.I /etc/tacplus_nss.conf
- tacplus NSS client library configuration file.
If you want to debug just NSS lookups, or have configuration variables that can
be used by programs that do not run with root privileges, add the configuration
variables listed in this manual page to this file
.SH AUTHOR
Dave Olson <olson@cumulusnetworks.com>