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# Copyright 1998 Juniper Networks, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
LIB= tacplus
SRCS= taclib.c
CFLAGS+= -Wall
DPADD+= ${LIBMD}
LDADD+= -lmd
SHLIB_MAJOR= 1
SHLIB_MINOR= 0
MAN3+= libtacplus.3
MAN5+= tacplus.conf.5
beforeinstall:
${INSTALL} ${COPY} -o ${BINOWN} -g ${BINGRP} -m 444 \
${.CURDIR}/taclib.h ${DESTDIR}/usr/include
.include <bsd.lib.mk>

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.\" Copyright 1998 Juniper Networks, Inc.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd September 2, 1998
.Dt LIBTACPLUS 3
.Os FreeBSD
.Sh NAME
.Nm libtacplus
.Nd TACACS+ client library
.Sh SYNOPSIS
.Fd #include <taclib.h>
.Ft int
.Fn tac_add_server "struct tac_handle *h" "const char *host" "int port" "const char *secret" "int timeout" "int flags"
.Ft void
.Fn tac_close "struct tac_handle *h"
.Ft int
.Fn tac_config "struct tac_handle *h" "const char *path"
.Ft int
.Fn tac_create_authen "struct tac_handle *h" "int action" "int type" "int service"
.Ft void *
.Fn tac_get_data "struct tac_handle *h" "size_t *len"
.Ft char *
.Fn tac_get_msg "struct tac_handle *h"
.Ft struct tac_handle *
.Fn tac_open "void"
.Ft int
.Fn tac_send_authen "struct tac_handle *h"
.Ft int
.Fn tac_set_data "struct tac_handle *h" "const void *data" "size_t data_len"
.Ft int
.Fn tac_set_msg "struct tac_handle *h" "const char *msg"
.Ft int
.Fn tac_set_port "struct tac_handle *h" "const char *port"
.Ft int
.Fn tac_set_priv "struct tac_handle *h" "int priv"
.Ft int
.Fn tac_set_rem_addr "struct tac_handle *h" "const char *addr"
.Ft int
.Fn tac_set_user "struct tac_handle *h" "const char *user"
.Ft const char *
.Fn tac_strerror "struct tac_handle *h"
.Sh DESCRIPTION
The
.Nm
library implements the client side of the TACACS+ network access
control protocol. TACACS+ allows clients to perform authentication,
authorization, and accounting by means of network requests to remote
servers. This library currently supports only the authentication
portion of the protocol.
.Sh INITIALIZATION
To use the library, an application must first call
.Fn tac_open
to obtain a
.Va struct tac_handle * ,
which provides context for subsequent operations.
Calls to
.Fn tac_open
always succeed unless insufficient virtual memory is available. If
the necessary memory cannot be allocated,
.Fn tac_open
returns
.Dv NULL .
.Pp
Before issuing any TACACS+ requests, the library must be made aware
of the servers it can contact. The easiest way to configure the
library is to call
.Fn tac_config .
.Fn tac_config
causes the library to read a configuration file whose format is
described in
.Xr tacplus.conf 5 .
The pathname of the configuration file is passed as the
.Va file
argument to
.Fn tac_config .
This argument may also be given as
.Dv NULL ,
in which case the standard configuration file
.Pa /etc/tacplus.conf
is used.
.Fn tac_config
returns 0 on success, or -1 if an error occurs.
.Pp
The library can also be configured programmatically by calls to
.Fn tac_add_server .
The
.Va host
parameter specifies the server host, either as a fully qualified
domain name or as a dotted-quad IP address in text form.
The
.Va port
parameter specifies the TCP port to contact on the server. If
.Va port
is given as 0, the library uses port 49, the standard TACACS+ port.
The shared secret for the server host is passed to the
.Va secret
parameter. It may be any null-terminated string of bytes.
The timeout for receiving replies from the server is passed to the
.Va timeout
parameter, in units of seconds.
The
.Va flags
parameter is a bit mask of flags to specify various characteristics of
the server. It may contain:
.Pp
.Bl -tag -width Fl
.It Dv TAC_SRVR_SINGLE_CONNECT
Causes the library to attempt to negotiate single connection mode
when communicating with the server. In single connection mode, the
original TCP connection is held open for multiple TACACS+ sessions.
Older servers do not support this mode, and some of them become
confused if the client attempts to negotiate it.
.El
.Pp
.Fn tac_add_server
returns 0 on success, or -1 if an error occurs.
.Pp
.Fn tac_add_server
may be called multiple times, and it may be used together with
.Fn tac_config .
At most 10 servers may be specified.
When multiple servers are given, they are tried in round-robin
fashion until a working, accessible server is found. Once the
library finds such a server, it continues to use it as long as it
works.
.Sh CREATING A TACACS+ AUTHENTICATION REQUEST
To begin constructing a new authentication request, call
.Fn tac_create_authen .
The
.Va action ,
.Va type ,
and
.Va service
arguments must be be set to appropriate values as defined in the
TACACS+ protocol specification. The
.Aq taclib.h
header file contains symbolic constants for these values.
.Pp
After creating a request with
.Fn tac_create_authen ,
various optional parameters may be attached to it through calls to
.Fn tac_set_data ,
.Fn tac_set_port ,
.Fn tac_set_priv ,
.Fn tac_set_rem_addr ,
and
.Fn tac_set_user .
The library creates its own copies of any strings provided to these
functions, so that it is not necessary for the caller to preserve
them. By default, each of these parameters is empty except for the
privilege level, which defaults to
.Ql USER
privilege.
.Sh SENDING THE AUTHENTICATION REQUEST AND RECEIVING THE RESPONSE
After the TACACS+ request has been constructed, it is sent by means
of
.Fn tac_send_authen .
This function connects to a server if not already connected, sends
the request, and waits for a reply. On failure,
.Fn tac_send_authen
returns -1. Otherwise, it returns the TACACS+ status code and flags,
packed into an integer value. The status can be extracted using the
macro
.Fn TAC_AUTHEN_STATUS .
Possible status codes, defined in
.Aq taclib.h ,
include:
.Pp
.Bl -item -compact -offset indent
.It
.Dv TAC_AUTHEN_STATUS_PASS
.It
.Dv TAC_AUTHEN_STATUS_FAIL
.It
.Dv TAC_AUTHEN_STATUS_GETDATA
.It
.Dv TAC_AUTHEN_STATUS_GETUSER
.It
.Dv TAC_AUTHEN_STATUS_GETPASS
.It
.Dv TAC_AUTHEN_STATUS_RESTART
.It
.Dv TAC_AUTHEN_STATUS_ERROR
.It
.Dv TAC_AUTHEN_STATUS_FOLLOW
.El
.Pp
The only flag is the no-echo flag, which can be tested using the
macro
.Fn TAC_AUTHEN_NOECHO .
.Sh EXTRACTING INFORMATION FROM THE SERVER'S RESPONSE
An authentication response packet from the server may contain a
server message, a data string, or both. After a successful call to
.Fn tac_send_authen ,
this information may be retrieved from the response by calling
.Fn tac_get_msg
and
.Fn tac_get_data .
These functions return dynamically-allocated copies of the
information from the packet. The caller is responsible for freeing
the copies when it no longer needs them. The data returned from
these functions is guaranteed to be terminated by a null byte.
.Pp
In the case of
.Fn tac_get_data ,
the
.Va len
argument points to a location into which the library will store the
actual length of the received data, not including the null
terminator. This argument may be given as
.Dv NULL
if the caller is not interested in the length.
.Sh SENDING AUTHENTICATION CONTINUE PACKETS
If
.Fn tac_send_authen
returns a value containing one of the status codes
.Dv TAC_AUTHEN_STATUS_GETDATA ,
.Dv TAC_AUTHEN_STATUS_GETUSER ,
or
.Dv TAC_AUTHEN_STATUS_GETPASS ,
then the client must provide additional information to the server by
means of a TACACS+ CONTINUE packet. To do so, the application must
first set the packet's user message and/or data fields using
.Fn tac_set_msg
and
.Fn tac_set_data .
The client then sends the CONTINUE packet with
.Fn tac_send_authen .
N.B.,
.Fn tac_create_authen
should
.Em not
be called to construct a CONTINUE packet; it is used only for the
initial authentication request.
.Pp
When it receives the CONTINUE packet, the server may again request
more information by returning
.Dv TAC_AUTHEN_STATUS_GETDATA ,
.Dv TAC_AUTHEN_STATUS_GETUSER ,
or
.Dv TAC_AUTHEN_STATUS_GETPASS .
The application should send further CONTINUEs until some other
status is received from the server.
.Sh OBTAINING ERROR MESSAGES
Those functions which accept a
.Va struct tac_handle *
argument record an error message if they fail. The error message
can be retrieved by calling
.Fn tac_strerror .
The message text is overwritten on each new error for the given
.Va struct tac_handle * .
Thus the message must be copied if it is to be preserved through
subsequent library calls using the same handle.
.Sh CLEANUP
To free the resources used by the TACACS+ library, call
.Fn tac_close .
.Sh RETURN VALUES
The following functions return a non-negative value on success. If
they detect an error, they return -1 and record an error message
which can be retrieved using
.Fn tac_strerror .
.Pp
.Bl -item -offset indent -compact
.It
.Fn tac_add_server
.It
.Fn tac_config
.It
.Fn tac_create_authen
.It
.Fn tac_send_authen
.It
.Fn tac_set_data
.It
.Fn tac_set_msg
.It
.Fn tac_set_port
.It
.Fn tac_set_priv
.It
.Fn tac_set_rem_addr
.It
.Fn tac_set_user
.El
.Pp
The following functions return a
.No non- Ns Dv NULL
pointer on success. If they are unable to allocate sufficient
virtual memory, they return
.Dv NULL
and record an error message which can be retrieved using
.Fn tac_strerror .
.Pp
.Bl -item -offset indent -compact
.It
.Fn tac_get_data
.It
.Fn tac_get_msg
.El
.Pp
The following functions return a
.No non- Ns Dv NULL
pointer on success. If they are unable to allocate sufficient
virtual memory, they return
.Dv NULL ,
without recording an error message.
.Pp
.Bl -item -offset indent -compact
.It
.Fn tac_open
.El
.Sh FILES
.Pa /etc/tacplus.conf
.Sh SEE ALSO
.Xr tacplus.conf 5
.Rs
.%A D. Carrel and Lol Grant
.%T The TACACS+ Protocol, Version 1.78
.%O draft-grant-tacacs-02.txt (Internet Draft)
.Re
.Sh AUTHORS
This software was written by
.An John Polstra ,
and donated to the FreeBSD project by Juniper Networks, Inc.

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/*-
* Copyright 1998 Juniper Networks, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _TACLIB_H_
#define _TACLIB_H_
#include <sys/types.h>
struct tac_handle;
/* Flags for tac_add_server(). */
#define TAC_SRVR_SINGLE_CONNECT 0x04 /* Keep connection open for multiple
sessions. */
/* Disassembly of tac_send_authen() return value. */
#define TAC_AUTHEN_STATUS(s) ((s) & 0xff)
#define TAC_AUTHEN_NOECHO(s) ((s) & (1<<8))
/* Privilege levels */
#define TAC_PRIV_LVL_MIN 0x00
#define TAC_PRIV_LVL_USER 0x01
#define TAC_PRIV_LVL_ROOT 0x0f
#define TAC_PRIV_LVL_MAX 0x0f
/* Authentication actions */
#define TAC_AUTHEN_LOGIN 0x01
#define TAC_AUTHEN_CHPASS 0x02
#define TAC_AUTHEN_SENDPASS 0x03
#define TAC_AUTHEN_SENDAUTH 0x04
/* Authentication types */
#define TAC_AUTHEN_TYPE_ASCII 0x01
#define TAC_AUTHEN_TYPE_PAP 0x02
#define TAC_AUTHEN_TYPE_CHAP 0x03
#define TAC_AUTHEN_TYPE_ARAP 0x04
#define TAC_AUTHEN_TYPE_MSCHAP 0x05
/* Authentication services */
#define TAC_AUTHEN_SVC_NONE 0x00
#define TAC_AUTHEN_SVC_LOGIN 0x01
#define TAC_AUTHEN_SVC_ENABLE 0x02
#define TAC_AUTHEN_SVC_PPP 0x03
#define TAC_AUTHEN_SVC_ARAP 0x04
#define TAC_AUTHEN_SVC_PT 0x05
#define TAC_AUTHEN_SVC_RCMD 0x06
#define TAC_AUTHEN_SVC_X25 0x07
#define TAC_AUTHEN_SVC_NASI 0x08
#define TAC_AUTHEN_SVC_FWPROXY 0x09
/* Authentication reply status codes */
#define TAC_AUTHEN_STATUS_PASS 0x01
#define TAC_AUTHEN_STATUS_FAIL 0x02
#define TAC_AUTHEN_STATUS_GETDATA 0x03
#define TAC_AUTHEN_STATUS_GETUSER 0x04
#define TAC_AUTHEN_STATUS_GETPASS 0x05
#define TAC_AUTHEN_STATUS_RESTART 0x06
#define TAC_AUTHEN_STATUS_ERROR 0x07
#define TAC_AUTHEN_STATUS_FOLLOW 0x21
__BEGIN_DECLS
int tac_add_server(struct tac_handle *,
const char *, int, const char *, int, int);
void tac_close(struct tac_handle *);
int tac_config(struct tac_handle *, const char *);
int tac_create_authen(struct tac_handle *, int, int, int);
void *tac_get_data(struct tac_handle *, size_t *);
char *tac_get_msg(struct tac_handle *);
struct tac_handle *tac_open(void);
int tac_send_authen(struct tac_handle *);
int tac_set_data(struct tac_handle *,
const void *, size_t);
int tac_set_msg(struct tac_handle *, const char *);
int tac_set_port(struct tac_handle *, const char *);
int tac_set_priv(struct tac_handle *, int);
int tac_set_rem_addr(struct tac_handle *, const char *);
int tac_set_user(struct tac_handle *, const char *);
const char *tac_strerror(struct tac_handle *);
__END_DECLS
#endif /* _TACLIB_H_ */

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/*-
* Copyright 1998 Juniper Networks, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef TACLIB_PRIVATE_H
#define TACLIB_PRIVATE_H
#include "taclib.h"
/* Defaults */
#define PATH_TACPLUS_CONF "/etc/tacplus.conf"
#define TACPLUS_PORT 49
#define TIMEOUT 3 /* In seconds */
/* Limits */
#define BODYSIZE 8150 /* Maximum message body size */
#define ERRSIZE 128 /* Maximum error message length */
#define MAXCONFLINE 1024 /* Maximum config file line length */
#define MAXSERVERS 10 /* Maximum number of servers to try */
/* Protocol constants. */
#define HDRSIZE 12 /* Size of message header */
/* Protocol version number */
#define TAC_VER_MAJOR 0xc /* Major version number */
/* Protocol packet types */
#define TAC_AUTHEN 0x01 /* Authentication */
#define TAC_AUTHOR 0x02 /* Authorization */
#define TAC_ACCT 0x03 /* Accouting */
/* Protocol header flags */
#define TAC_UNENCRYPTED 0x01
#define TAC_SINGLE_CONNECT 0x04
struct tac_server {
struct sockaddr_in addr; /* Address of server */
char *secret; /* Shared secret */
int timeout; /* Timeout in seconds */
int flags;
};
/*
* An optional string of bytes specified by the client for inclusion in
* a request. The data is always a dynamically allocated copy that
* belongs to the library. It is copied into the request packet just
* before sending the request.
*/
struct clnt_str {
void *data;
size_t len;
};
/*
* An optional string of bytes from a server response. The data resides
* in the response packet itself, and must not be freed.
*/
struct srvr_str {
const void *data;
size_t len;
};
struct tac_authen_start {
u_int8_t action;
u_int8_t priv_lvl;
u_int8_t authen_type;
u_int8_t service;
u_int8_t user_len;
u_int8_t port_len;
u_int8_t rem_addr_len;
u_int8_t data_len;
unsigned char rest[1];
};
struct tac_authen_reply {
u_int8_t status;
u_int8_t flags;
u_int16_t msg_len;
u_int16_t data_len;
unsigned char rest[1];
};
struct tac_authen_cont {
u_int16_t user_msg_len;
u_int16_t data_len;
u_int8_t flags;
unsigned char rest[1];
};
struct tac_msg {
u_int8_t version;
u_int8_t type;
u_int8_t seq_no;
u_int8_t flags;
u_int8_t session_id[4];
u_int32_t length;
union {
struct tac_authen_start authen_start;
struct tac_authen_reply authen_reply;
struct tac_authen_cont authen_cont;
unsigned char body[BODYSIZE];
} u;
};
struct tac_handle {
int fd; /* Socket file descriptor */
struct tac_server servers[MAXSERVERS]; /* Servers to contact */
int num_servers; /* Number of valid server entries */
int cur_server; /* Server we are currently using */
int single_connect; /* Use a single connection */
int last_seq_no;
char errmsg[ERRSIZE]; /* Most recent error message */
struct clnt_str user;
struct clnt_str port;
struct clnt_str rem_addr;
struct clnt_str data;
struct clnt_str user_msg;
struct tac_msg request;
struct tac_msg response;
int srvr_pos; /* Scan position in response body */
struct srvr_str srvr_msg;
struct srvr_str srvr_data;
};
#endif

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.\" Copyright 1998 Juniper Networks, Inc.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd July 29, 1998
.Dt TACPLUS.CONF 5
.Os FreeBSD
.Sh NAME
.Nm tacplus.conf
.Nd TACACS+ client configuration file
.Sh SYNOPSIS
.Pa /etc/tacplus.conf
.Sh DESCRIPTION
.Nm
contains the information necessary to configure the TACACS+ client
library. It is parsed by
.Xr tac_config 3 .
The file contains one or more lines of text, each describing a
single TACACS+ server which is to be used by the library. Leading
white space is ignored, as are empty lines and lines containing
only comments.
.Pp
A TACACS+ server is described by two to four fields on a line. The
fields are separated by white space. The
.Ql #
character at the beginning of a field begins a comment, which extends
to the end of the line. A field may be enclosed in double quotes,
in which case it may contain white space and/or begin with the
.Ql #
character. Within a quoted string, the double quote character can
be represented by
.Ql \e\&" ,
and the backslash can be represented by
.Ql \e\e .
No other escape sequences are supported.
.Pp
The first field specifies
the server host, either as a fully qualified domain name or as a
dotted-quad IP address. The host may optionally be followed by a
.Ql \&:
and a numeric port number, without intervening white space. If the
port specification is omitted, it defaults to 49, the standard TACACS+
port.
.Pp
The second field contains the shared secret, which should be known
only to the client and server hosts. It is an arbitrary string
of characters, though it must be enclosed in double quotes if it
contains white space or is empty. An empty secret disables the
normal encryption mechanism, causing all data to cross the network in
cleartext.
.Pp
The third field contains a decimal integer specifying the timeout
in seconds for communicating with the server. The timeout applies
separately to each connect, write, and read operation. If this field
is omitted, it defaults to 3 seconds.
.Pp
The optional fourth field may contain the string
.Ql single-connection .
If this option is included, the library will attempt to negotiate
with the server to keep the TCP connection open for multiple
sessions. Some older TACACS+ servers become confused if this option
is specified.
.Pp
Up to 10 TACACS+ servers may be specified. The servers are tried in
order, until a valid response is received or the list is exhausted.
.Pp
The standard location for this file is
.Pa /etc/tacplus.conf .
An alternate pathname may be specified in the call to
.Xr tac_config 3 .
Since the file contains sensitive information in the form of the
shared secrets, it should not be readable except by root.
.Sh FILES
.Pa /etc/tacplus.conf
.Sh EXAMPLES
.Bd -literal
# A simple entry using all the defaults:
tacserver.domain.com OurLittleSecret
# A server using a non-standard port, with an increased timeout and
# the "single-connection" option.
auth.domain.com:4333 "Don't tell!!" 15 single-connection
# A server specified by its IP address:
192.168.27.81 $X*#..38947ax-+=
.Ed
.Sh SEE ALSO
.Xr libtacplus 3
.Sh AUTHORS
This documentation was written by
.An John Polstra ,
and donated to the FreeBSD project by Juniper Networks, Inc.