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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* lib/krb5/os/def_realm.c
*
* Copyright 1990,1991,2009 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* krb5_get_default_realm(), krb5_set_default_realm(),
* krb5_free_default_realm() functions.
*/
#include "k5-int.h"
#include "os-proto.h"
#include <stdio.h>
#ifdef KRB5_DNS_LOOKUP
#ifdef WSHELPER
#include <wshelper.h>
#else /* WSHELPER */
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <netdb.h>
#endif /* WSHELPER */
/* for old Unixes and friends ... */
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif
#define MAX_DNS_NAMELEN (15*(MAXHOSTNAMELEN + 1)+1)
#endif /* KRB5_DNS_LOOKUP */
/*
* Retrieves the default realm to be used if no user-specified realm is
* available. [e.g. to interpret a user-typed principal name with the
* realm omitted for convenience]
*
* returns system errors, NOT_ENOUGH_SPACE, KV5M_CONTEXT
*/
/*
* Implementation: the default realm is stored in a configuration file,
* named by krb5_config_file; the first token in this file is taken as
* the default local realm name.
*/
krb5_error_code KRB5_CALLCONV
krb5_get_default_realm(krb5_context context, char **lrealm)
{
char *realm = 0;
krb5_error_code retval;
if (!context || (context->magic != KV5M_CONTEXT))
return KV5M_CONTEXT;
if (!context->default_realm) {
/*
* XXX should try to figure out a reasonable default based
* on the host's DNS domain.
*/
context->default_realm = 0;
if (context->profile != 0) {
retval = profile_get_string(context->profile, KRB5_CONF_LIBDEFAULTS,
KRB5_CONF_DEFAULT_REALM, 0, 0,
&realm);
if (!retval && realm) {
context->default_realm = strdup(realm);
if (!context->default_realm) {
profile_release_string(realm);
return ENOMEM;
}
profile_release_string(realm);
}
}
#ifndef KRB5_DNS_LOOKUP
else
return KRB5_CONFIG_CANTOPEN;
#else /* KRB5_DNS_LOOKUP */
if (context->default_realm == 0) {
int use_dns = _krb5_use_dns_realm(context);
if ( use_dns ) {
/*
* Since this didn't appear in our config file, try looking
* it up via DNS. Look for a TXT records of the form:
*
* _kerberos.<localhost>
* _kerberos.<domainname>
* _kerberos.<searchlist>
*
*/
char localhost[MAX_DNS_NAMELEN+1];
char * p;
krb5int_get_fq_local_hostname (localhost, sizeof(localhost));
if ( localhost[0] ) {
p = localhost;
do {
retval = krb5_try_realm_txt_rr("_kerberos", p,
&context->default_realm);
p = strchr(p,'.');
if (p)
p++;
} while (retval && p && p[0]);
if (retval)
retval = krb5_try_realm_txt_rr("_kerberos", "",
&context->default_realm);
} else {
retval = krb5_try_realm_txt_rr("_kerberos", "",
&context->default_realm);
}
if (retval) {
return(KRB5_CONFIG_NODEFREALM);
}
}
}
#endif /* KRB5_DNS_LOOKUP */
}
if (context->default_realm == 0)
return(KRB5_CONFIG_NODEFREALM);
if (context->default_realm[0] == 0) {
free (context->default_realm);
context->default_realm = 0;
return KRB5_CONFIG_NODEFREALM;
}
realm = context->default_realm;
if (!(*lrealm = strdup(realm)))
return ENOMEM;
return(0);
}
krb5_error_code KRB5_CALLCONV
krb5_set_default_realm(krb5_context context, const char *lrealm)
{
if (!context || (context->magic != KV5M_CONTEXT))
return KV5M_CONTEXT;
if (context->default_realm) {
free(context->default_realm);
context->default_realm = 0;
}
/* Allow the user to clear the default realm setting by passing in
NULL */
if (!lrealm) return 0;
context->default_realm = strdup(lrealm);
if (!context->default_realm)
return ENOMEM;
return(0);
}
void KRB5_CALLCONV
krb5_free_default_realm(krb5_context context, char *lrealm)
{
free (lrealm);
}
krb5_error_code
krb5int_get_domain_realm_mapping(krb5_context context, const char *host, char ***realmsp)
{
char **retrealms;
char *realm, *cp, *temp_realm;
krb5_error_code retval;
char temp_host[MAX_DNS_NAMELEN+1];
/* do sanity check and lower-case */
retval = krb5int_clean_hostname(context, host, temp_host, sizeof temp_host);
if (retval)
return retval;
/*
Search for the best match for the host or domain.
Example: Given a host a.b.c.d, try to match on:
1) a.b.c.d 2) .b.c.d. 3) b.c.d 4) .c.d 5) c.d 6) .d 7) d
*/
cp = temp_host;
realm = (char *)NULL;
temp_realm = 0;
while (cp ) {
retval = profile_get_string(context->profile, KRB5_CONF_DOMAIN_REALM, cp,
0, (char *)NULL, &temp_realm);
if (retval)
return retval;
if (temp_realm != (char *)NULL)
break; /* Match found */
/* Setup for another test */
if (*cp == '.') {
cp++;
} else {
cp = strchr(cp, '.');
}
}
if (temp_realm != (char*)NULL) {
realm = strdup(temp_realm);
profile_release_string(temp_realm);
if (!realm) {
return ENOMEM;
}
}
retrealms = (char **)calloc(2, sizeof(*retrealms));
if (!retrealms) {
if (realm != (char *)NULL)
free(realm);
return ENOMEM;
}
retrealms[0] = realm;
retrealms[1] = 0;
*realmsp = retrealms;
return 0;
}
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