src/tests/asu.c

   1 /*
   2  * Copyright (c) 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 #include <sys/types.h>
  39 #include <sys/param.h>
  40 #include <sys/ioctl.h>
  41 #include <stdio.h>
  42 #include <pwd.h>
  43 #include <unistd.h>
  44 #include <grp.h>
  45
  46 #include <err.h>
  47
  48 static void
  49 usage(int exit_val)
  50 {
  51     fprintf(stderr, "asu user program [arguments ...]\n");
  52     exit(exit_val);
  53 }
  54
  55 int
  56 main(int argc, char **argv)
  57 {
  58     const char *user, *prog;
  59
  60
  61     if (argc < 3)
  62         usage(1);
  63
  64     user = argv[1];
  65     prog = argv[2];
  66
  67     if (getuid() == 0) {
  68         struct passwd *pw;
  69         gid_t groups[1];
  70         uid_t uid;
  71         gid_t gid;
  72
  73         pw = getpwnam(user);
  74         if (pw == NULL)
  75             errx(1, "no such user %s", user);
  76
  77         uid = pw->pw_uid;
  78         gid = pw->pw_gid;
  79         groups[0] = gid;
  80
  81         if (setgroups(1, groups))
  82             errx(1, "setgroups failed");
  83
  84         setgid(gid);
  85         setuid(uid);
  86         setegid(gid);
  87         seteuid(uid);
  88     }
  89 #if 0
  90     if (k_hasafs()) {
  91         int ret = k_setpag();
  92         if (ret < 0)
  93             warn("k_setpag");
  94     }
  95 #endif
  96
  97     execvp(prog, &argv[2]);
  98
  99     return 0;
 100 }