mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-16 10:20:30 +00:00
94 lines
3.5 KiB
Groff
94 lines
3.5 KiB
Groff
.TH HOSTS_ACCESS 3
|
|
.SH NAME
|
|
hosts_access, hosts_ctl, request_init, request_set \- access control library
|
|
.SH SYNOPSIS
|
|
.nf
|
|
#include "tcpd.h"
|
|
|
|
extern int allow_severity;
|
|
extern int deny_severity;
|
|
|
|
struct request_info *request_init(request, key, value, ..., 0)
|
|
struct request_info *request;
|
|
|
|
struct request_info *request_set(request, key, value, ..., 0)
|
|
struct request_info *request;
|
|
|
|
int hosts_access(request)
|
|
struct request_info *request;
|
|
|
|
int hosts_ctl(daemon, client_name, client_addr, client_user)
|
|
char *daemon;
|
|
char *client_name;
|
|
char *client_addr;
|
|
char *client_user;
|
|
.fi
|
|
.SH DESCRIPTION
|
|
The routines described in this document are part of the \fIlibwrap.a\fR
|
|
library. They implement a rule-based access control language with
|
|
optional shell commands that are executed when a rule fires.
|
|
.PP
|
|
request_init() initializes a structure with information about a client
|
|
request. request_set() updates an already initialized request
|
|
structure. Both functions take a variable-length list of key-value
|
|
pairs and return their first argument. The argument lists are
|
|
terminated with a zero key value. All string-valued arguments are
|
|
copied. The expected keys (and corresponding value types) are:
|
|
.IP "RQ_FILE (int)"
|
|
The file descriptor associated with the request.
|
|
.IP "RQ_CLIENT_NAME (char *)"
|
|
The client host name.
|
|
.IP "RQ_CLIENT_ADDR (char *)"
|
|
A printable representation of the client network address.
|
|
.IP "RQ_CLIENT_SIN (struct sockaddr_in *)"
|
|
An internal representation of the client network address and port. The
|
|
contents of the structure are not copied.
|
|
.IP "RQ_SERVER_NAME (char *)"
|
|
The hostname associated with the server endpoint address.
|
|
.IP "RQ_SERVER_ADDR (char *)"
|
|
A printable representation of the server endpoint address.
|
|
.IP "RQ_SERVER_SIN (struct sockaddr_in *)"
|
|
An internal representation of the server endpoint address and port.
|
|
The contents of the structure are not copied.
|
|
.IP "RQ_DAEMON (char *)"
|
|
The name of the daemon process running on the server host.
|
|
.IP "RQ_USER (char *)"
|
|
The name of the user on whose behalf the client host makes the request.
|
|
.PP
|
|
hosts_access() consults the access control tables described in the
|
|
\fIhosts_access(5)\fR manual page. When internal endpoint information
|
|
is available, host names and client user names are looked up on demand,
|
|
using the request structure as a cache. hosts_access() returns zero if
|
|
access should be denied.
|
|
.PP
|
|
hosts_ctl() is a wrapper around the request_init() and hosts_access()
|
|
routines with a perhaps more convenient interface (though it does not
|
|
pass on enough information to support automated client username
|
|
lookups). The client host address, client host name and username
|
|
arguments should contain valid data or STRING_UNKNOWN. hosts_ctl()
|
|
returns zero if access should be denied.
|
|
.PP
|
|
The \fIallow_severity\fR and \fIdeny_severity\fR variables determine
|
|
how accepted and rejected requests may be logged. They must be provided
|
|
by the caller and may be modified by rules in the access control
|
|
tables.
|
|
.SH DIAGNOSTICS
|
|
Problems are reported via the syslog daemon.
|
|
.SH SEE ALSO
|
|
hosts_access(5), format of the access control tables.
|
|
hosts_options(5), optional extensions to the base language.
|
|
.SH FILES
|
|
/etc/hosts.allow, /etc/hosts.deny, access control tables.
|
|
.SH BUGS
|
|
hosts_access() uses the strtok() library function. This may interfere
|
|
with other code that relies on strtok().
|
|
.SH AUTHOR
|
|
.na
|
|
.nf
|
|
Wietse Venema (wietse@wzv.win.tue.nl)
|
|
Department of Mathematics and Computing Science
|
|
Eindhoven University of Technology
|
|
Den Dolech 2, P.O. Box 513,
|
|
5600 MB Eindhoven, The Netherlands
|
|
\" @(#) hosts_access.3 1.8 96/02/11 17:01:26
|