162 lines
4.0 KiB
Groff
162 lines
4.0 KiB
Groff
.\" from: krb_realmofhost.3,v 4.1 89/01/23 11:10:47 jtkohl Exp $
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.\" $Id: krb_realmofhost.3,v 1.1.1.1 1994/09/30 14:50:07 csgr Exp $
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.\" Copyright 1989 by the Massachusetts Institute of Technology.
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.\"
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.\" For copying and distribution information,
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.\" please see the file <Copyright.MIT>.
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.\"
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.TH KRB_REALMOFHOST 3 "Kerberos Version 4.0" "MIT Project Athena"
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.SH NAME
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krb_realmofhost, krb_get_phost, krb_get_krbhst, krb_get_admhst,
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krb_get_lrealm \- additional Kerberos utility routines
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.SH SYNOPSIS
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.nf
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.nj
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.ft B
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#include <kerberosIV/krb.h>
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#include <kerberosIV/des.h>
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#include <netinet/in.h>
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.PP
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.ft B
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char *krb_realmofhost(host)
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char *host;
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.PP
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.ft B
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char *krb_get_phost(alias)
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char *alias;
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.PP
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.ft B
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krb_get_krbhst(host,realm,n)
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char *host;
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char *realm;
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int n;
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.PP
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.ft B
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krb_get_admhst(host,realm,n)
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char *host;
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char *realm;
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int n;
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.PP
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.ft B
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krb_get_lrealm(realm,n)
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char *realm;
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int n;
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.fi
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.ft R
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.SH DESCRIPTION
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.I krb_realmofhost
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returns the Kerberos realm of the host
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.IR host ,
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as determined by the translation table
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.IR /etc/kerberosIV/krb.realms .
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.I host
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should be the fully-qualified domain-style primary host name of the host
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in question. In order to prevent certain security attacks, this routine
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must either have
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.I a priori
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knowledge of a host's realm, or obtain such information securely.
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.PP
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The format of the translation file is described by
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.IR krb.realms (5).
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If
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.I host
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exactly matches a host_name line, the corresponding realm
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is returned.
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Otherwise, if the domain portion of
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.I host
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matches a domain_name line, the corresponding realm
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is returned.
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If
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.I host
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contains a domain, but no translation is found,
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.IR host 's
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domain is converted to upper-case and returned.
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If
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.I host
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contains no discernable domain, or an error occurs,
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the local realm name, as supplied by
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.IR krb_get_lrealm (3),
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is returned.
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.PP
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.I krb_get_phost
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converts the hostname
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.I alias
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(which can be either an official name or an alias) into the instance
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name to be used in obtaining Kerberos tickets for most services,
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including the Berkeley rcmd suite (rlogin, rcp, rsh).
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.br
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The current convention is to return the first segment of the official
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domain-style name after conversion to lower case.
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.PP
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.I krb_get_krbhst
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fills in
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.I host
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with the hostname of the
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.IR n th
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host running a Kerberos key distribution center (KDC)
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for realm
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.IR realm ,
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as specified in the configuration file (\fI/etc/kerberosIV/krb.conf\fR).
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The configuration file is described by
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.IR krb.conf (5).
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If the host is successfully filled in, the routine
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returns KSUCCESS.
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If the file cannot be opened, and
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.I n
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equals 1, then the value of KRB_HOST as defined in
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.I <krb.h>
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is filled in, and KSUCCESS is returned. If there are fewer than
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.I n
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hosts running a Kerberos KDC for the requested realm, or the
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configuration file is malformed, the routine
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returns KFAILURE.
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.PP
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.I krb_get_admhst
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fills in
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.I host
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with the hostname of the
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.IR n th
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host running a Kerberos KDC database administration server
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for realm
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.IR realm ,
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as specified in the configuration file (\fI/etc/kerberosIV/krb.conf\fR).
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If the file cannot be opened or is malformed, or there are fewer than
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.I n
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hosts running a Kerberos KDC database administration server,
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the routine returns KFAILURE.
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.PP
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The character arrays used as return values for
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.IR krb_get_krbhst ,
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.IR krb_get_admhst ,
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should be large enough to
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hold any hostname (MAXHOSTNAMELEN from <sys/param.h>).
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.PP
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.I krb_get_lrealm
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fills in
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.I realm
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with the
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.IR n th
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realm of the local host, as specified in the configuration file.
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.I realm
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should be at least REALM_SZ (from
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.IR <krb.h>) characters long.
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.PP
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.SH SEE ALSO
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kerberos(3), krb.conf(5), krb.realms(5)
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.SH FILES
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.TP 20n
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/etc/kerberosIV/krb.realms
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translation file for host-to-realm mapping.
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.TP
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/etc/kerberosIV/krb.conf
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local realm-name and realm/server configuration file.
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.SH BUGS
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The current convention for instance names is too limited; the full
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domain name should be used.
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.PP
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.I krb_get_lrealm
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currently only supports
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.I n
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= 1. It should really consult the user's ticket cache to determine the
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user's current realm, rather than consulting a file on the host.
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