tests/lib/libc/sys/t_setuid.c

   1 /* $NetBSD: t_setuid.c,v 1.1 2011/07/07 06:57:54 jruoho Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jukka Ruohonen.
   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  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #include <sys/cdefs.h>
  32 __RCSID("$NetBSD: t_setuid.c,v 1.1 2011/07/07 06:57:54 jruoho Exp $");
  33
  34 #include <sys/wait.h>
  35
  36 #include <atf-c.h>
  37 #include <errno.h>
  38 #include <pwd.h>
  39 #include <stdlib.h>
  40 #include <unistd.h>
  41
  42 ATF_TC(setuid_perm);
  43 ATF_TC_HEAD(setuid_perm, tc)
  44 {
  45         atf_tc_set_md_var(tc, "descr", "Test setuid(0) as normal user");
  46         atf_tc_set_md_var(tc, "require.user", "unprivileged");
  47 }
  48
  49 ATF_TC_BODY(setuid_perm, tc)
  50 {
  51         errno = 0;
  52
  53         ATF_REQUIRE(setuid(0) == -1);
  54         ATF_REQUIRE(errno == EPERM);
  55 }
  56
  57 ATF_TC(setuid_real);
  58 ATF_TC_HEAD(setuid_real, tc)
  59 {
  60         atf_tc_set_md_var(tc, "descr", "Test setuid(2) with real UID");
  61 }
  62
  63 ATF_TC_BODY(setuid_real, tc)
  64 {
  65         uid_t uid = getuid();
  66
  67         ATF_REQUIRE(setuid(uid) == 0);
  68
  69         ATF_REQUIRE(getuid() == uid);
  70         ATF_REQUIRE(geteuid() == uid);
  71 }
  72
  73 ATF_TC(setuid_root);
  74 ATF_TC_HEAD(setuid_root, tc)
  75 {
  76         atf_tc_set_md_var(tc, "descr", "A basic test of setuid(2)");
  77         atf_tc_set_md_var(tc, "require.user", "root");
  78 }
  79
  80 ATF_TC_BODY(setuid_root, tc)
  81 {
  82         struct passwd *pw;
  83         int rv, sta;
  84         pid_t pid;
  85         uid_t uid;
  86
  87         while ((pw = getpwent()) != NULL) {
  88
  89                 pid = fork();
  90                 ATF_REQUIRE(pid >= 0);
  91
  92                 if (pid == 0) {
  93
  94                         rv = setuid(pw->pw_uid);
  95
  96                         if (rv != 0)
  97                                 _exit(EXIT_FAILURE);
  98
  99                         uid = getuid();
 100
 101                         if (uid != pw->pw_uid)
 102                                 _exit(EXIT_FAILURE);
 103
 104                         _exit(EXIT_SUCCESS);
 105                 }
 106
 107                 (void)wait(&sta);
 108
 109                 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
 110                         atf_tc_fail("failed to change UID to %u", pw->pw_uid);
 111         }
 112 }
 113
 114 ATF_TP_ADD_TCS(tp)
 115 {
 116
 117         ATF_TP_ADD_TC(tp, setuid_perm);
 118         ATF_TP_ADD_TC(tp, setuid_real);
 119         ATF_TP_ADD_TC(tp, setuid_root);
 120
 121         return atf_no_error();
 122 }