#include "config.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <pwd.h>
#include <errno.h>
#include <grp.h>
#ifdef HAVE_LOGIN_CAP_H
# include <login_cap.h>
#endif
#include "sudo.h"
#ifndef lint
static const char rcsid[] = "$Sudo: set_perms.c,v 1.12 2002/01/22 02:00:25 millert Exp $";
#endif
static void runas_setup __P((void));
static void fatal __P((char *, int));
#if !defined(NO_SAVED_IDS) && defined(_SC_SAVED_IDS) && defined(_SC_VERSION)
void
set_perms_posix(perm, sudo_mode)
int perm;
int sudo_mode;
{
int error;
switch (perm) {
case PERM_ROOT:
if (seteuid(0))
fatal("seteuid(0) failed, your operating system may have broken POSIX saved ID support\nTry running configure with --disable-saved-ids", 0);
break;
case PERM_FULL_ROOT:
(void) seteuid(0);
if (setuid(0))
fatal("setuid(0)", 1);
break;
case PERM_USER:
(void) setegid(user_gid);
if (seteuid(user_uid))
fatal("seteuid(user_uid)", 1);
break;
case PERM_FULL_USER:
(void) setgid(user_gid);
if (setuid(user_uid))
fatal("setuid(user_uid)", 1);
break;
case PERM_RUNAS:
runas_setup();
if (def_flag(I_STAY_SETUID))
error = seteuid(runas_pw->pw_uid);
else
error = setuid(runas_pw->pw_uid);
if (error)
fatal("unable to change to runas uid", 1);
break;
case PERM_SUDOERS:
if (setegid(SUDOERS_GID))
fatal("unable to change to sudoers gid", 1);
if (SUDOERS_UID == 0) {
if ((SUDOERS_MODE & 040) && seteuid(1))
fatal("seteuid(1)", 1);
} else {
if (seteuid(SUDOERS_UID))
fatal("seteuid(SUDOERS_UID)", 1);
}
break;
}
}
#endif
#ifdef HAVE_SETREUID
void
set_perms_fallback(perm, sudo_mode)
int perm;
int sudo_mode;
{
int error;
switch (perm) {
case PERM_FULL_ROOT:
case PERM_ROOT:
if (setuid(0))
fatal("setuid(0) failed, your operating system may have broken POSIX saved ID support\nTry running configure with --disable-setreuid", 0);
break;
case PERM_USER:
(void) setegid(user_gid);
if (setreuid(0, user_uid))
fatal("setreuid(0, user_uid)", 1);
break;
case PERM_FULL_USER:
(void) setgid(user_gid);
if (setuid(user_uid))
fatal("setuid(user_uid)", 1);
break;
case PERM_RUNAS:
runas_setup();
if (def_flag(I_STAY_SETUID))
error = setreuid(user_uid, runas_pw->pw_uid);
else
error = setuid(runas_pw->pw_uid);
if (error)
fatal("unable to change to runas uid", 1);
break;
case PERM_SUDOERS:
if (setegid(SUDOERS_GID))
fatal("unable to change to sudoers gid", 1);
if (SUDOERS_UID == 0) {
if ((SUDOERS_MODE & 040) && setreuid(0, 1))
fatal("setreuid(0, 1)", 1);
} else {
if (setreuid(0, SUDOERS_UID))
fatal("setreuid(0, SUDOERS_UID)", 1);
}
break;
}
}
#else
void
set_perms_fallback(perm, sudo_mode)
int perm;
int sudo_mode;
{
if (setuid(0))
fatal("setuid(0)", 1);
switch (perm) {
case PERM_USER:
(void) setegid(user_gid);
if (seteuid(user_uid))
fatal("seteuid(user_uid)", 1);
break;
case PERM_FULL_USER:
(void) setgid(user_gid);
if (setuid(user_uid))
fatal("setuid(user_uid)", 1);
break;
case PERM_RUNAS:
runas_setup();
if (setuid(runas_pw->pw_uid))
fatal("unable to change to runas uid", 1);
break;
case PERM_SUDOERS:
if (setegid(SUDOERS_GID))
fatal("unable to change to sudoers gid", 1);
if (SUDOERS_UID == 0) {
if ((SUDOERS_MODE & 040) && seteuid(1))
fatal("seteuid(1)", 1);
} else {
if (seteuid(SUDOERS_UID))
fatal("seteuid(SUDOERS_UID)", 1);
}
break;
}
}
#endif
static void
runas_setup()
{
#ifdef HAVE_LOGIN_CAP_H
int error, flags;
extern login_cap_t *lc;
#endif
if (runas_pw->pw_name != NULL) {
#ifdef HAVE_PAM
pam_prep_user(runas_pw);
#endif
#ifdef HAVE_LOGIN_CAP_H
if (def_flag(I_USE_LOGINCLASS)) {
flags = LOGIN_SETRESOURCES|LOGIN_SETPRIORITY;
if (!def_flag(I_PRESERVE_GROUPS))
flags |= LOGIN_SETGROUP;
else if (setgid(runas_pw->pw_gid))
perror("cannot set gid to runas gid");
error = setusercontext(lc, runas_pw,
runas_pw->pw_uid, flags);
if (error)
perror("unable to set user context");
} else
#endif
{
if (setgid(runas_pw->pw_gid))
perror("cannot set gid to runas gid");
#ifdef HAVE_INITGROUPS
if (!def_flag(I_PRESERVE_GROUPS) &&
initgroups(*user_runas, runas_pw->pw_gid) < 0)
perror("cannot set group vector");
#endif
}
}
}
static void
fatal(str, printerr)
char *str;
{
if (str) {
if (printerr)
perror(str);
else {
fputs(str, stderr);
fputc('\n', stderr);
}
}
exit(1);
}