crypto/external/bsd/heimdal/dist/kdc/main.c

   1 /*      $NetBSD: main.c,v 1.1.1.2 2014/04/24 12:45:27 pettai Exp $      */
   2
   3 /*
   4  * Copyright (c) 1997-2005 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  *
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  *
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  *
  21  * 3. Neither the name of the Institute nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #include "kdc_locl.h"
  39 #ifdef HAVE_UTIL_H
  40 #include <util.h>
  41 #endif
  42
  43 #ifdef HAVE_CAPNG
  44 #include <cap-ng.h>
  45 #endif
  46
  47 sig_atomic_t exit_flag = 0;
  48
  49 #ifdef SUPPORT_DETACH
  50 int detach_from_console = -1;
  51 #endif
  52
  53 static RETSIGTYPE
  54 sigterm(int sig)
  55 {
  56     exit_flag = sig;
  57 }
  58
  59 /*
  60  * Allow dropping root bit, since heimdal reopens the database all the
  61  * time the database needs to be owned by the user you are switched
  62  * too. A better solution is to split the kdc in to more processes and
  63  * run the network facing part with very low privilege.
  64  */
  65
  66 static void
  67 switch_environment(void)
  68 {
  69 #ifdef HAVE_GETEUID
  70     if ((runas_string || chroot_string) && geteuid() != 0)
  71         errx(1, "no running as root, can't switch user/chroot");
  72
  73     if (chroot_string) {
  74         if (chroot(chroot_string))
  75             err(1, "chroot(%s) failed", chroot_string);
  76         if (chdir("/"))
  77             err(1, "chdir(/) after chroot failed");
  78     }
  79
  80     if (runas_string) {
  81         struct passwd *pw;
  82
  83         pw = getpwnam(runas_string);
  84         if (pw == NULL)
  85             errx(1, "unknown user %s", runas_string);
  86
  87         if (initgroups(pw->pw_name, pw->pw_gid) < 0)
  88             err(1, "initgroups failed");
  89
  90 #ifndef HAVE_CAPNG
  91         if (setgid(pw->pw_gid) < 0)
  92             err(1, "setgid(%s) failed", runas_string);
  93
  94         if (setuid(pw->pw_uid) < 0)
  95             err(1, "setuid(%s)", runas_string);
  96 #else
  97         capng_clear (CAPNG_EFFECTIVE | CAPNG_PERMITTED);
  98         if (capng_updatev (CAPNG_ADD, CAPNG_EFFECTIVE | CAPNG_PERMITTED,
  99                            CAP_NET_BIND_SERVICE, CAP_SETPCAP, -1) < 0)
 100             err(1, "capng_updateev");
 101
 102         if (capng_change_id(pw->pw_uid, pw->pw_gid,
 103                             CAPNG_CLEAR_BOUNDING) < 0)
 104             err(1, "capng_change_id(%s)", runas_string);
 105 #endif
 106     }
 107 #endif
 108 }
 109
 110
 111 int
 112 main(int argc, char **argv)
 113 {
 114     krb5_error_code ret;
 115     krb5_context context;
 116     krb5_kdc_configuration *config;
 117
 118     setprogname(argv[0]);
 119
 120     ret = krb5_init_context(&context);
 121     if (ret == KRB5_CONFIG_BADFORMAT)
 122         errx (1, "krb5_init_context failed to parse configuration file");
 123     else if (ret)
 124         errx (1, "krb5_init_context failed: %d", ret);
 125
 126     ret = krb5_kt_register(context, &hdb_kt_ops);
 127     if (ret)
 128         errx (1, "krb5_kt_register(HDB) failed: %d", ret);
 129
 130     config = configure(context, argc, argv);
 131
 132 #ifdef HAVE_SIGACTION
 133     {
 134         struct sigaction sa;
 135
 136         sa.sa_flags = 0;
 137         sa.sa_handler = sigterm;
 138         sigemptyset(&sa.sa_mask);
 139
 140         sigaction(SIGINT, &sa, NULL);
 141         sigaction(SIGTERM, &sa, NULL);
 142 #ifdef SIGXCPU
 143         sigaction(SIGXCPU, &sa, NULL);
 144 #endif
 145
 146         sa.sa_handler = SIG_IGN;
 147 #ifdef SIGPIPE
 148         sigaction(SIGPIPE, &sa, NULL);
 149 #endif
 150     }
 151 #else
 152     signal(SIGINT, sigterm);
 153     signal(SIGTERM, sigterm);
 154 #ifdef SIGXCPU
 155     signal(SIGXCPU, sigterm);
 156 #endif
 157 #ifdef SIGPIPE
 158     signal(SIGPIPE, SIG_IGN);
 159 #endif
 160 #endif
 161 #ifdef SUPPORT_DETACH
 162     if (detach_from_console)
 163         daemon(0, 0);
 164 #endif
 165 #ifdef __APPLE__
 166     bonjour_announce(context, config);
 167 #endif
 168     pidfile(NULL);
 169
 170     switch_environment();
 171
 172     loop(context, config);
 173     krb5_free_context(context);
 174     return 0;
 175 }