NetBSD/usr.sbin/sendmail/test/t_setreuid.c

83 lines
1.8 KiB
C

/*
** This program checks to see if your version of setreuid 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 HASSETREUID in conf.h.
**
** Compilation is trivial -- just "cc t_setreuid.c".
*/
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#ifdef __hpux
#define setreuid(r, e) setresuid(r, e, -1)
#endif
main()
{
uid_t realuid = getuid();
printuids("initial uids", realuid, 0);
if (geteuid() != 0)
{
printf("re-run setuid root\n");
exit(1);
}
if (setreuid(0, 1) < 0)
printf("setreuid(0, 1) failure\n");
printuids("after setreuid(0, 1)", 0, 1);
if (geteuid() != 1)
printf("MAYDAY! Wrong effective uid\n");
/* do activity here */
if (setreuid(-1, 0) < 0)
printf("setreuid(-1, 0) failure\n");
printuids("after setreuid(-1, 0)", 0, 0);
if (setreuid(realuid, 0) < 0)
printf("setreuid(%d, 0) failure\n", realuid);
printuids("after setreuid(realuid, 0)", realuid, 0);
if (geteuid() != 0)
printf("MAYDAY! Wrong effective uid\n");
if (getuid() != realuid)
printf("MAYDAY! Wrong real uid\n");
printf("\n");
if (setreuid(0, 2) < 0)
printf("setreuid(0, 2) failure\n");
printuids("after setreuid(0, 2)", 0, 2);
if (geteuid() != 2)
printf("MAYDAY! Wrong effective uid\n");
/* do activity here */
if (setreuid(-1, 0) < 0)
printf("setreuid(-1, 0) failure\n");
printuids("after setreuid(-1, 0)", 0, 0);
if (setreuid(realuid, 0) < 0)
printf("setreuid(%d, 0) failure\n", realuid);
printuids("after setreuid(realuid, 0)", realuid, 0);
if (geteuid() != 0)
printf("MAYDAY! Wrong effective uid\n");
if (getuid() != realuid)
printf("MAYDAY! Wrong real uid\n");
exit(0);
}
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());
}