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