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140 lines
2.6 KiB
C
140 lines
2.6 KiB
C
/*
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* Copyright (c) 1999-2001 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*
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*/
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/*
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** This program checks to see if your version of seteuid works.
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** Compile it, make it set-user-ID root, and run it as yourself (NOT as
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** root). If it won't compile or outputs any MAYDAY messages, don't
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** define USESETEUID in conf.h.
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**
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** NOTE: It is not sufficient to have seteuid in your library.
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** You must also have saved uids that function properly.
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**
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** Compilation is trivial -- just "cc t_seteuid.c". Make it set-user-ID
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** root and then execute it as a non-root user.
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdio.h>
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#ifndef lint
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static char id[] = "@(#)$Id: t_seteuid.c,v 8.8 2001/09/23 03:35:41 ca Exp $";
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#endif /* ! lint */
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#ifdef __hpux
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# define seteuid(e) setresuid(-1, e, -1)
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#endif /* __hpux */
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static void
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printuids(str, r, e)
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char *str;
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uid_t r, e;
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{
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printf("%s (should be %d/%d): r/euid=%d/%d\n", str, (int) r, (int) e,
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(int) getuid(), (int) geteuid());
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}
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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int fail = 0;
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uid_t realuid = getuid();
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printuids("initial uids", realuid, 0);
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if (geteuid() != 0)
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{
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printf("SETUP ERROR: re-run set-user-ID root\n");
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exit(1);
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}
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if (getuid() == 0)
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{
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printf("SETUP ERROR: must be run by a non-root user\n");
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exit(1);
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}
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if (seteuid(1) < 0)
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printf("seteuid(1) failure\n");
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printuids("after seteuid(1)", realuid, 1);
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if (geteuid() != 1)
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{
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fail++;
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printf("MAYDAY! Wrong effective uid\n");
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}
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/* do activity here */
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if (seteuid(0) < 0)
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{
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fail++;
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printf("seteuid(0) failure\n");
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}
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printuids("after seteuid(0)", realuid, 0);
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if (geteuid() != 0)
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{
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fail++;
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printf("MAYDAY! Wrong effective uid\n");
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}
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if (getuid() != realuid)
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{
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fail++;
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printf("MAYDAY! Wrong real uid\n");
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}
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printf("\n");
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if (seteuid(2) < 0)
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{
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fail++;
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printf("seteuid(2) failure\n");
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}
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printuids("after seteuid(2)", realuid, 2);
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if (geteuid() != 2)
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{
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fail++;
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printf("MAYDAY! Wrong effective uid\n");
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}
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/* do activity here */
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if (seteuid(0) < 0)
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{
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fail++;
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printf("seteuid(0) failure\n");
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}
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printuids("after seteuid(0)", realuid, 0);
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if (geteuid() != 0)
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{
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fail++;
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printf("MAYDAY! Wrong effective uid\n");
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}
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if (getuid() != realuid)
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{
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fail++;
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printf("MAYDAY! Wrong real uid\n");
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}
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if (fail)
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{
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printf("\nThis system cannot use seteuid\n");
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exit(1);
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}
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printf("\nIt is safe to define USESETEUID on this system\n");
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exit(0);
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}
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