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/*
* Several 'setreuid()' replacements for those systems that
* don't have it, or have it under different names...
*/
#include "hostenv.h"
/*
* From Ross Ridge's Xenix port:
* - setreuid, setreuid, *sigh* this going to a big mondo problem porting
* Zmailer to a box without it or SysVR3's saved set-user ID. Xenix is
* one of these beasties, so I resorted to a desperate hack: I wrote
* setreuid function that opens /dev/kmem and fiddles with the u area.
*/
/*
* Simpleton ports of HPUX setresuid() to setreuid() replacement..
* Though maybe it is better to be done on macrolevel ?
* This REQUIRES "SETREUID" in the hostenv/HPUX8 -file!
*/
/* Several tricks for IBM AIX for Zmailer
by Matti Aarnio <mea@utu.fi> <mea@nic.funet.fi>
Mostly these are pulled in from various sources :)
On your AIX machine, see:
/usr/lpp/bos/bsdport(.tr)
file for the information about how to do the porting of
BSD-oriented software into AIX systems.
(A PostScript rendered version is on Zmailers doc/aix-bsdport.ps)
*/
#if (defined(AIX) || defined(_AIX)) && !defined(_AIX41)
#include <sys/types.h>
#include <sys/param.h>
#include <sys/id.h>
#include <sys/priv.h>
int
setreuid(ruid,euid)
uid_t ruid, euid;
{
/* Pulled in from WUARCHIVE's FTPD source.. */
/* AIX 3 lossage. Don't ask. It's undocumented. */
/* [mea]: WU-people did err, it IS documented; AIX is just
a bit peculiar.. */
priv_t priv;
priv.pv_priv[0] = 0;
priv.pv_priv[1] = 0;
setgroups(NULL, NULL);
if (setpriv(PRIV_SET|PRIV_INHERITED|PRIV_EFFECTIVE|PRIV_BEQUEATH,
&priv, sizeof(priv_t)) < 0)
return -1;
if (ruid != (uid_t)-1)
if (setuidx(ID_REAL|ID_EFFECTIVE, ruid) < 0)
return -1;
if (euid != (uid_t)-1)
if (seteuid(euid) < 0)
return -1;
#ifdef UID_DEBUG
lreply(230, "ruid=%d, euid=%d, suid=%d, luid=%d", getuidx(ID_REAL),
getuidx(ID_EFFECTIVE), getuidx(ID_SAVED), getuidx(ID_LOGIN));
lreply(230, "rgid=%d, egid=%d, sgid=%d, lgid=%d", getgidx(ID_REAL),
getgidx(ID_EFFECTIVE), getgidx(ID_SAVED), getgidx(ID_LOGIN));
#endif
return 0;
}
#else /* Not AIX */
#ifdef HAVE_SETREUID /* AIX has a sort of setreuid() at its libc, however
it does not work... All others either have it, or
don't, and need emulation: */
/* static int dummy = 0; */
#else /* .. else need emulation */
#ifdef HAVE_SETEUID /* Pure SysVR4 ? */
int setreuid(ruid, euid)
uid_t ruid, euid;
{
/* THIS IS NOT PURE IMPLEMENTATION! */
/* INTENTION IS TO PROVIDE SOMETHING WORKABLE
WITHOUT TOO COMPLEX A PROGRAM... */
int rc = 0;
if (euid >= 0) {
rc = seteuid(euid);
if (ruid < 0)
return rc;
}
if (ruid >= 0)
return setuid(ruid);
return rc;
}
#else
#ifdef __hpux /* HP-UX ?? */
#include <sys/types.h>
int
setreuid(ruid, euid)
uid_t ruid, euid;
{
return setresuid(ruid,euid,(uid_t)-1);
}
#else /* Not HPUX 9.xx, (8.xx ?) */
/* Else something else funny.. */
/* We go via SysVr3 methods, which are horrible.. */
#ifdef SYSV
/* Uhh... We open process uarea from kernel memory, and poke it
directly. Seriously NOT FUN, but ... */
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/signal.h>
#include <sys/page.h>
#include <sys/seg.h>
#include <sys/sysmacros.h>
#include <sys/user.h>
#undef TEST
#ifndef TEST
#include "libsupport.h"
#include "sysprotos.h"
#endif
static struct user uu;
static int kmem_fd = -1;
static int
read_u() {
if (lseek(kmem_fd, (long) SPTADDR, 0) == -1) {
perror("lseek failed!");
return -1;
}
if (read(kmem_fd, &uu, sizeof uu) == -1) {
perror("read failed!");
return -1;
}
return 0;
}
static int
write_uid(int uid, int euid) {
if (lseek(kmem_fd,
(char *) &uu.u_ruid - (char *) &uu + (long) SPTADDR,
0) == -1L) {
perror("lseek failed!");
return -1;
}
uu.u_ruid = uid;
if (write(kmem_fd, &uu.u_ruid, sizeof uu.u_ruid) == -1) {
perror("write failed!");
return -1;
}
if (lseek(kmem_fd,
(char *) &uu.u_uid - (char *) &uu + (long) SPTADDR,
0) == -1L) {
perror("lseek failed!");
return -1;
}
uu.u_uid = euid;
if (write(kmem_fd, &uu.u_uid, sizeof uu.u_uid) == -1) {
perror("write failed!");
return -1;
}
return 0;
}
int
setreuid(int uid, int euid) {
int cmask;
if (kmem_fd == -1) {
kmem_fd = open("/dev/kmem", O_RDWR);
if (kmem_fd == -1) {
return -1;
}
if (read_u() == -1) {
abort(); /* kvm IO-error ! */
}
cmask = umask(0);
umask(cmask);
if (uu.u_ruid != getuid() || uu.u_rgid != getgid()
|| uu.u_uid != geteuid() || uu.u_gid != getegid()
|| uu.u_cmask != cmask) {
fprintf(stderr, "setreuid check failed!\n");
abort(); /* kvm IO-error ! */
}
if (fcntl(kmem_fd, F_SETFD, 1) == -1) {
perror("fcntl failed!");
abort(); /* kvm IO-error ! */
}
}
if (uid == -1) {
uid = getuid();
} else if ((unsigned) uid >= MAXUID) {
errno = EINVAL;
return -1;
}
if (euid == -1) {
euid = geteuid();
} else if ((unsigned) euid >= MAXUID) {
errno = EINVAL;
return -1;
}
if (write_uid(uid, euid) == -1) {
abort(); /* kvm IO-error ! */
}
return 0;
}
#ifdef TEST
main() {
kmem_fd = open("/dev/kmem", O_RDWR);
if (kmem_fd == -1) {
perror("open failed!");
return 1;
}
printf("SPTADDR = %#lx\n", SPTADDR);
if (read_u() == -1) {
return 1;
}
printf("u_uid: %d u_gid: %d u_rgid: %d u_ruid: %d\n",
uu.u_uid, uu.u_gid, uu.u_rgid, uu.u_ruid);
printf("u_cmask: %#03o u_limit: %ld\n", uu.u_cmask, (long) uu.u_limit);
printf("u_psargs: '%-0.40s'\n", uu.u_psargs);
setreuid(0, 1);
printf("\ngeteuid() = %d\n", geteuid());
if (read_u() == -1) {
return 1;
}
printf("u_uid: %d u_gid: %d u_rgid: %d u_ruid: %d\n",
uu.u_uid, uu.u_gid, uu.u_rgid, uu.u_ruid);
printf("u_cmask: %#03o u_limit: %ld\n", uu.u_cmask, (long) uu.u_limit);
printf("u_psargs: '%-0.40s'\n", uu.u_psargs);
setreuid(0, 0);
printf("\ngeteuid() = %d\n", geteuid());
close(kmem_fd);
return 0;
}
#endif
#else /* not SYSV - 386 ? ... */
static int foovar = 0; /* some systems want something into .o -file */
#endif /* Not SYSV */
#endif /* Not SYSV, not __hpux */
#endif /* HAVE_SETEUID */
#endif /* HAVE_SETREUID */
#endif /* Not AIX either.. */
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