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/*
* Copyright (c) 1997-2005 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kdc_locl.h"
#ifdef HAVE_UTIL_H
#include <util.h>
#endif
#ifdef HAVE_CAPNG
#include <cap-ng.h>
#endif
sig_atomic_t exit_flag = 0;
#ifdef SUPPORT_DETACH
int detach_from_console = -1;
#endif
static RETSIGTYPE
sigterm(int sig)
{
exit_flag = sig;
}
/*
* Allow dropping root bit, since heimdal reopens the database all the
* time the database needs to be owned by the user you are switched
* too. A better solution is to split the kdc in to more processes and
* run the network facing part with very low privilege.
*/
static void
switch_environment(void)
{
#ifdef HAVE_GETEUID
if ((runas_string || chroot_string) && geteuid() != 0)
errx(1, "no running as root, can't switch user/chroot");
if (chroot_string && chroot(chroot_string) != 0)
errx(1, "chroot(%s)", "chroot_string failed");
if (runas_string) {
struct passwd *pw;
pw = getpwnam(runas_string);
if (pw == NULL)
errx(1, "unknown user %s", runas_string);
if (initgroups(pw->pw_name, pw->pw_gid) < 0)
err(1, "initgroups failed");
#ifndef HAVE_CAPNG
if (setgid(pw->pw_gid) < 0)
err(1, "setgid(%s) failed", runas_string);
if (setuid(pw->pw_uid) < 0)
err(1, "setuid(%s)", runas_string);
#else
capng_clear (CAPNG_EFFECTIVE | CAPNG_PERMITTED);
if (capng_updatev (CAPNG_ADD, CAPNG_EFFECTIVE | CAPNG_PERMITTED,
CAP_NET_BIND_SERVICE, CAP_SETPCAP, -1) < 0)
err(1, "capng_updateev");
if (capng_change_id(pw->pw_uid, pw->pw_gid,
CAPNG_CLEAR_BOUNDING) < 0)
err(1, "capng_change_id(%s)", runas_string);
#endif
}
#endif
}
int
main(int argc, char **argv)
{
krb5_error_code ret;
krb5_context context;
krb5_kdc_configuration *config;
setprogname(argv[0]);
ret = krb5_init_context(&context);
if (ret == KRB5_CONFIG_BADFORMAT)
errx (1, "krb5_init_context failed to parse configuration file");
else if (ret)
errx (1, "krb5_init_context failed: %d", ret);
ret = krb5_kt_register(context, &hdb_kt_ops);
if (ret)
errx (1, "krb5_kt_register(HDB) failed: %d", ret);
config = configure(context, argc, argv);
#ifdef HAVE_SIGACTION
{
struct sigaction sa;
sa.sa_flags = 0;
sa.sa_handler = sigterm;
sigemptyset(&sa.sa_mask);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
#ifdef SIGXCPU
sigaction(SIGXCPU, &sa, NULL);
#endif
sa.sa_handler = SIG_IGN;
#ifdef SIGPIPE
sigaction(SIGPIPE, &sa, NULL);
#endif
}
#else
signal(SIGINT, sigterm);
signal(SIGTERM, sigterm);
#ifdef SIGXCPU
signal(SIGXCPU, sigterm);
#endif
#ifdef SIGPIPE
signal(SIGPIPE, SIG_IGN);
#endif
#endif
#ifdef SUPPORT_DETACH
if (detach_from_console)
daemon(0, 0);
#endif
#ifdef __APPLE__
bonjour_announce(context, config);
#endif
pidfile(NULL);
switch_environment();
loop(context, config);
krb5_free_context(context);
return 0;
}
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