130 lines
2.3 KiB
C
130 lines
2.3 KiB
C
/*
|
|
** This program checks to see if your version of seteuid works.
|
|
** Compile it, make it setuid root, and run it as yourself (NOT as
|
|
** root). If it won't compile or outputs any MAYDAY messages, don't
|
|
** define USESETEUID in conf.h.
|
|
**
|
|
** NOTE: It is not sufficient to have seteuid in your library.
|
|
** You must also have saved uids that function properly.
|
|
**
|
|
** Compilation is trivial -- just "cc t_seteuid.c". Make it setuid,
|
|
** root and then execute it as a non-root user.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
|
|
#ifndef lint
|
|
static char id[] = "@(#)$Id: t_seteuid.c,v 8.4 1999/08/28 00:25:28 gshapiro Exp $";
|
|
#endif /* ! lint */
|
|
|
|
#ifdef __hpux
|
|
# define seteuid(e) setresuid(-1, e, -1)
|
|
#endif /* __hpux */
|
|
|
|
static void
|
|
printuids(str, r, e)
|
|
char *str;
|
|
int r, e;
|
|
{
|
|
printf("%s (should be %d/%d): r/euid=%d/%d\n", str, r, e,
|
|
getuid(), geteuid());
|
|
}
|
|
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
int fail = 0;
|
|
uid_t realuid = getuid();
|
|
|
|
printuids("initial uids", realuid, 0);
|
|
|
|
if (geteuid() != 0)
|
|
{
|
|
printf("SETUP ERROR: re-run setuid root\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (getuid() == 0)
|
|
{
|
|
printf("SETUP ERROR: must be run by a non-root user\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (seteuid(1) < 0)
|
|
printf("seteuid(1) failure\n");
|
|
printuids("after seteuid(1)", realuid, 1);
|
|
|
|
if (geteuid() != 1)
|
|
{
|
|
fail++;
|
|
printf("MAYDAY! Wrong effective uid\n");
|
|
}
|
|
|
|
/* do activity here */
|
|
|
|
if (seteuid(0) < 0)
|
|
{
|
|
fail++;
|
|
printf("seteuid(0) failure\n");
|
|
}
|
|
printuids("after seteuid(0)", realuid, 0);
|
|
|
|
if (geteuid() != 0)
|
|
{
|
|
fail++;
|
|
printf("MAYDAY! Wrong effective uid\n");
|
|
}
|
|
if (getuid() != realuid)
|
|
{
|
|
fail++;
|
|
printf("MAYDAY! Wrong real uid\n");
|
|
}
|
|
printf("\n");
|
|
|
|
if (seteuid(2) < 0)
|
|
{
|
|
fail++;
|
|
printf("seteuid(2) failure\n");
|
|
}
|
|
printuids("after seteuid(2)", realuid, 2);
|
|
|
|
if (geteuid() != 2)
|
|
{
|
|
fail++;
|
|
printf("MAYDAY! Wrong effective uid\n");
|
|
}
|
|
|
|
/* do activity here */
|
|
|
|
if (seteuid(0) < 0)
|
|
{
|
|
fail++;
|
|
printf("seteuid(0) failure\n");
|
|
}
|
|
printuids("after seteuid(0)", realuid, 0);
|
|
|
|
if (geteuid() != 0)
|
|
{
|
|
fail++;
|
|
printf("MAYDAY! Wrong effective uid\n");
|
|
}
|
|
if (getuid() != realuid)
|
|
{
|
|
fail++;
|
|
printf("MAYDAY! Wrong real uid\n");
|
|
}
|
|
|
|
if (fail)
|
|
{
|
|
printf("\nThis system cannot use seteuid\n");
|
|
exit(1);
|
|
}
|
|
|
|
printf("\nIt is safe to define USESETEUID on this system\n");
|
|
exit(0);
|
|
}
|