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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2020 Nexenta by DDN, Inc. All rights reserved.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/note.h>
#include <synch.h>
#include <thread.h>
#include <ads/dsgetdc.h>
#include "idmapd.h"
#include "libadutils.h"
#include "locate_plugin.h"
/* osconf.h - sigh */
#define KRB5_DEFAULT_PORT 88
#define DEFAULT_KADM5_PORT 749
#define DEFAULT_KPASSWD_PORT 464
/*
* This is an "override plugin" used by libkrb5. See:
* lib/gss_mechs/mech_krb5/krb5/os/locate_kdc.c
*
* The interface is based on:
* http://web.mit.edu/~kerberos/krb5-1.12/doc/plugindev/locate.html
*/
/*
* Called by krb5int_locate_server / override_locate_server
*/
krb5_error_code
_krb5_override_service_locator(
void *arg0,
enum locate_service_type svc,
const char *realm,
int socktype,
int family,
int (*cbfunc)(void *, int, struct sockaddr *),
void *cbdata)
{
_NOTE(ARGUNUSED(arg0))
idmap_pg_config_t *pgcfg;
ad_disc_ds_t *ds;
int rc = KRB5_PLUGIN_NO_HANDLE;
short port;
/*
* Is this a service we want to override?
*/
switch (svc) {
case locate_service_kdc:
case locate_service_master_kdc:
port = htons(KRB5_DEFAULT_PORT);
break;
case locate_service_kadmin:
port = htons(DEFAULT_KADM5_PORT);
break;
case locate_service_kpasswd:
port = htons(DEFAULT_KPASSWD_PORT);
break;
case locate_service_krb524:
default:
return (rc);
}
RDLOCK_CONFIG();
pgcfg = &_idmapdstate.cfg->pgcfg;
/*
* Is this a realm we want to override?
*/
if (pgcfg->domain_name == NULL)
goto out;
if (0 != strcasecmp(realm, pgcfg->domain_name))
goto out;
/*
* Yes, this is our domain. Have a DC?
*/
if ((ds = pgcfg->domain_controller) == NULL) {
rc = KRB5_REALM_CANT_RESOLVE;
goto out;
}
if ((ds->flags & DS_KDC_FLAG) == 0) {
idmapdlog(LOG_WARNING, "Domain Controller is not a KDC: "
"Kerberos auth may be slow");
goto out;
}
switch (family) {
case AF_UNSPEC:
break; /* OK */
case AF_INET:
case AF_INET6:
if (family == ds->addr.ss_family)
break; /* OK */
/* else fallthrough */
default:
rc = KRB5_ERR_NO_SERVICE;
goto out;
}
/*
* Provide the service address we have.
*/
switch (ds->addr.ss_family) {
case AF_INET: {
struct sockaddr_in sin;
struct sockaddr_in *dsa = (void *)&ds->addr;
(void) memset(&sin, 0, sizeof (sin));
sin.sin_family = AF_INET;
sin.sin_port = port;
(void) memcpy(&sin.sin_addr, &dsa->sin_addr,
sizeof (sin.sin_addr));
rc = cbfunc(cbdata, socktype, (struct sockaddr *)&sin);
break;
}
case AF_INET6: {
struct sockaddr_in6 sin6;
struct sockaddr_in6 *dsa6 = (void *)&ds->addr;
(void) memset(&sin6, 0, sizeof (sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_port = port;
(void) memcpy(&sin6.sin6_addr, &dsa6->sin6_addr,
sizeof (sin6.sin6_addr));
rc = cbfunc(cbdata, socktype, (struct sockaddr *)&sin6);
break;
}
default:
rc = KRB5_ERR_NO_SERVICE;
goto out;
}
/* rc from cbfunc is special. */
if (rc)
rc = ENOMEM;
out:
UNLOCK_CONFIG();
return (rc);
}
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