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/*
** 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". Make it setuid,
** root and then execute it as a non-root user.
*/
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#ifdef __hpux
#define setreuid(r, e) setresuid(r, e, -1)
#endif
main()
{
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 (setreuid(0, 1) < 0)
{
fail++;
printf("setreuid(0, 1) failure\n");
}
printuids("after setreuid(0, 1)", 0, 1);
if (geteuid() != 1)
{
fail++;
printf("MAYDAY! Wrong effective uid\n");
}
/* do activity here */
if (setreuid(-1, 0) < 0)
{
fail++;
printf("setreuid(-1, 0) failure\n");
}
printuids("after setreuid(-1, 0)", 0, 0);
if (setreuid(realuid, 0) < 0)
{
fail++;
printf("setreuid(%d, 0) failure\n", realuid);
}
printuids("after setreuid(realuid, 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 (setreuid(0, 2) < 0)
{
fail++;
printf("setreuid(0, 2) failure\n");
}
printuids("after setreuid(0, 2)", 0, 2);
if (geteuid() != 2)
{
fail++;
printf("MAYDAY! Wrong effective uid\n");
}
/* do activity here */
if (setreuid(-1, 0) < 0)
{
fail++;
printf("setreuid(-1, 0) failure\n");
}
printuids("after setreuid(-1, 0)", 0, 0);
if (setreuid(realuid, 0) < 0)
{
fail++;
printf("setreuid(%d, 0) failure\n", realuid);
}
printuids("after setreuid(realuid, 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 setreuid\n");
exit(1);
}
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());
}
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