120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
/*
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* Copyright (c) 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 setgid works.
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** Compile it, make it set-group-ID guest, and run it as yourself (NOT as
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** root and not as member of the group guest).
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**
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** Compilation is trivial -- just "cc t_setgid.c". Make it set-group-ID,
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** guest 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_setgid.c,v 1.6 2001/09/23 03:35:41 ca Exp $";
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#endif /* ! lint */
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static void
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printgids(str, r, e)
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char *str;
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gid_t r, e;
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{
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printf("%s (should be %d/%d): r/egid=%d/%d\n", str, (int) r, (int) e,
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(int) getgid(), (int) getegid());
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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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int res;
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gid_t realgid = getgid();
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gid_t effgid = getegid();
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printgids("initial gids", realgid, effgid);
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if (effgid == realgid)
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{
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printf("SETUP ERROR: re-run set-group-ID guest\n");
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exit(1);
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}
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#if SM_CONF_SETREGID
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res = setregid(effgid, effgid);
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#else /* SM_CONF_SETREGID */
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res = setgid(effgid);
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#endif /* SM_CONF_SETREGID */
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printf("setgid(%d)=%d %s\n", (int) effgid, res,
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res < 0 ? "failure" : "ok");
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#if SM_CONF_SETREGID
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printgids("after setregid()", effgid, effgid);
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#else /* SM_CONF_SETREGID */
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printgids("after setgid()", effgid, effgid);
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#endif /* SM_CONF_SETREGID */
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if (getegid() != effgid)
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{
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fail++;
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printf("MAYDAY! Wrong effective gid\n");
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}
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if (getgid() != effgid)
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{
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fail++;
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printf("MAYDAY! Wrong real gid\n");
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}
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/* do activity here */
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if (setgid(0) == 0)
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{
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fail++;
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printf("MAYDAY! setgid(0) succeeded (should have failed)\n");
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}
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else
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{
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printf("setgid(0) failed (this is correct)\n");
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}
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printgids("after setgid(0)", effgid, effgid);
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if (getegid() != effgid)
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{
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fail++;
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printf("MAYDAY! Wrong effective gid\n");
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}
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if (getgid() != effgid)
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{
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fail++;
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printf("MAYDAY! Wrong real gid\n");
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}
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printf("\n");
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if (fail > 0)
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{
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printf("\nThis system cannot use %s to set the real gid to the effective gid\nand clear the saved gid.\n",
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#if SM_CONF_SETREGID
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"setregid"
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#else /* SM_CONF_SETREGID */
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"setgid"
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#endif /* SM_CONF_SETREGID */
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);
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exit(1);
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}
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printf("\nIt is possible to use setgid on this system\n");
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exit(0);
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}
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