700 lines
15 KiB
C
700 lines
15 KiB
C
/* $NetBSD: kern_prot.c,v 1.57 2000/04/21 16:15:39 minoura Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1989, 1990, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_prot.c 8.9 (Berkeley) 2/14/95
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*/
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/*
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* System calls related to processes and protection
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*/
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#include "opt_compat_freebsd.h"
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#include "opt_compat_ibcs2.h"
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#include "opt_compat_sunos.h"
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#include "opt_compat_linux.h"
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#include "opt_compat_43.h"
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#include "opt_compat_osf1.h"
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#include <sys/param.h>
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#include <sys/acct.h>
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#include <sys/systm.h>
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#include <sys/ucred.h>
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#include <sys/proc.h>
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#include <sys/timeb.h>
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#include <sys/times.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/syscallargs.h>
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/* ARGSUSED */
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int
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sys_getpid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_pid;
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_IBCS2) || \
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defined(COMPAT_FREEBSD) || defined(COMPAT_OSF1) || \
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(defined(COMPAT_LINUX) && defined(__alpha__))
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retval[1] = p->p_pptr->p_pid;
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#endif
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return (0);
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}
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/* ARGSUSED */
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int
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sys_getppid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_pptr->p_pid;
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return (0);
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}
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/* Get process group ID; note that POSIX getpgrp takes no parameter */
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int
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sys_getpgrp(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_pgrp->pg_id;
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return (0);
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}
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/*
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* Return the process group ID of the session leader (session ID)
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* for the specified process.
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*/
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int
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sys_getsid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_getsid_args /* {
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syscalldarg(pid_t) pid;
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} */ *uap = v;
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if (SCARG(uap, pid) == 0)
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goto found;
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if ((p = pfind(SCARG(uap, pid))) == 0)
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return (ESRCH);
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found:
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*retval = p->p_session->s_sid;
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return 0;
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}
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int
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sys_getpgid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_getpgid_args /* {
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syscallarg(pid_t) pid;
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} */ *uap = v;
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if (SCARG(uap, pid) == 0)
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goto found;
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if ((p = pfind(SCARG(uap, pid))) == 0)
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return (ESRCH);
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found:
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*retval = p->p_pgid;
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return 0;
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}
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/* ARGSUSED */
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int
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sys_getuid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_cred->p_ruid;
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_IBCS2) || \
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defined(COMPAT_FREEBSD) || defined(COMPAT_OSF1) || \
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(defined(COMPAT_LINUX) && defined(__alpha__))
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retval[1] = p->p_ucred->cr_uid;
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#endif
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return (0);
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}
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/* ARGSUSED */
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int
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sys_geteuid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_ucred->cr_uid;
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return (0);
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}
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/* ARGSUSED */
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int
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sys_getgid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_cred->p_rgid;
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_FREEBSD) || \
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defined(COMPAT_OSF1) || (defined(COMPAT_LINUX) && defined(alpha))
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retval[1] = p->p_ucred->cr_gid;
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#endif
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return (0);
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}
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/*
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* Get effective group ID. The "egid" is groups[0], and could be obtained
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* via getgroups. This syscall exists because it is somewhat painful to do
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* correctly in a library function.
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*/
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/* ARGSUSED */
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int
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sys_getegid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_ucred->cr_gid;
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return (0);
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}
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int
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sys_getgroups(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_getgroups_args /* {
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syscallarg(int) gidsetsize;
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syscallarg(gid_t *) gidset;
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} */ *uap = v;
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struct pcred *pc = p->p_cred;
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int ngrp;
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int error;
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ngrp = SCARG(uap, gidsetsize);
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if (ngrp == 0) {
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*retval = pc->pc_ucred->cr_ngroups;
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return (0);
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}
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if (ngrp < pc->pc_ucred->cr_ngroups)
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return (EINVAL);
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ngrp = pc->pc_ucred->cr_ngroups;
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error = copyout((caddr_t)pc->pc_ucred->cr_groups,
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(caddr_t)SCARG(uap, gidset), ngrp * sizeof(gid_t));
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if (error)
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return (error);
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*retval = ngrp;
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return (0);
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}
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/* ARGSUSED */
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int
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sys_setsid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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if (p->p_pgid == p->p_pid || pgfind(p->p_pid)) {
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return (EPERM);
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} else {
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(void)enterpgrp(p, p->p_pid, 1);
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*retval = p->p_pid;
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return (0);
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}
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}
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/*
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* set process group (setpgid/old setpgrp)
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*
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* caller does setpgid(targpid, targpgid)
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*
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* pgid must be in valid range (EINVAL)
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* pid must be caller or child of caller (ESRCH)
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* if a child
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* pid must be in same session (EPERM)
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* pid can't have done an exec (EACCES)
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* if pgid != pid
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* there must exist some pid in same session having pgid (EPERM)
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* pid must not be session leader (EPERM)
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*/
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/* ARGSUSED */
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int
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sys_setpgid(curp, v, retval)
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struct proc *curp;
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void *v;
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register_t *retval;
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{
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struct sys_setpgid_args /* {
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syscallarg(int) pid;
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syscallarg(int) pgid;
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} */ *uap = v;
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struct proc *targp; /* target process */
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struct pgrp *pgrp; /* target pgrp */
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if (SCARG(uap, pgid) < 0)
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return (EINVAL);
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if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != curp->p_pid) {
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if ((targp = pfind(SCARG(uap, pid))) == 0 || !inferior(targp))
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return (ESRCH);
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if (targp->p_session != curp->p_session)
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return (EPERM);
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if (targp->p_flag & P_EXEC)
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return (EACCES);
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} else
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targp = curp;
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if (SESS_LEADER(targp))
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return (EPERM);
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if (SCARG(uap, pgid) == 0)
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SCARG(uap, pgid) = targp->p_pid;
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else if (SCARG(uap, pgid) != targp->p_pid)
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if ((pgrp = pgfind(SCARG(uap, pgid))) == 0 ||
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pgrp->pg_session != curp->p_session)
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return (EPERM);
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return (enterpgrp(targp, SCARG(uap, pgid), 0));
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}
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/* ARGSUSED */
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int
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sys_setuid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setuid_args /* {
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syscallarg(uid_t) uid;
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} */ *uap = v;
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struct pcred *pc = p->p_cred;
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uid_t uid;
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int error;
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uid = SCARG(uap, uid);
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if (uid != pc->p_ruid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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/*
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* Everything's okay, do it.
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* Transfer proc count to new user.
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* Copy credentials so other references do not see our changes.
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*/
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(void)chgproccnt(pc->p_ruid, -1);
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(void)chgproccnt(uid, 1);
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_uid = uid;
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pc->p_ruid = uid;
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pc->p_svuid = uid;
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p_sugid(p);
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return (0);
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}
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/* ARGSUSED */
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int
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sys_seteuid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_seteuid_args /* {
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syscallarg(uid_t) euid;
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} */ *uap = v;
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struct pcred *pc = p->p_cred;
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uid_t euid;
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int error;
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euid = SCARG(uap, euid);
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if (euid != pc->p_ruid && euid != pc->p_svuid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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/*
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* Everything's okay, do it. Copy credentials so other references do
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* not see our changes.
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*/
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_uid = euid;
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p_sugid(p);
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return (0);
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}
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int
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sys_setreuid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setreuid_args /* {
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syscallarg(uid_t) ruid;
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syscallarg(uid_t) euid;
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} */ *uap = v;
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struct pcred *pc = p->p_cred;
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uid_t ruid, euid;
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int error;
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ruid = SCARG(uap, ruid);
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euid = SCARG(uap, euid);
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if (ruid != (uid_t)-1 &&
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ruid != pc->p_ruid && ruid != pc->pc_ucred->cr_uid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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if (euid != (uid_t)-1 &&
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euid != pc->p_ruid && euid != pc->pc_ucred->cr_uid &&
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euid != pc->p_svuid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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if (euid != (uid_t)-1) {
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_uid = euid;
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}
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if (ruid != (uid_t)-1) {
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(void)chgproccnt(pc->p_ruid, -1);
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(void)chgproccnt(ruid, 1);
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pc->p_ruid = ruid;
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pc->p_svuid = pc->pc_ucred->cr_uid;
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}
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if (euid != (uid_t)-1 && ruid != (uid_t)-1)
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p_sugid(p);
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return (0);
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}
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/* ARGSUSED */
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int
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sys_setgid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setgid_args /* {
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syscallarg(gid_t) gid;
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} */ *uap = v;
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struct pcred *pc = p->p_cred;
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gid_t gid;
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int error;
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gid = SCARG(uap, gid);
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if (gid != pc->p_rgid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_gid = gid;
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pc->p_rgid = gid;
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pc->p_svgid = gid;
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p_sugid(p);
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return (0);
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}
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/* ARGSUSED */
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int
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sys_setegid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setegid_args /* {
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syscallarg(gid_t) egid;
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} */ *uap = v;
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struct pcred *pc = p->p_cred;
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gid_t egid;
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int error;
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egid = SCARG(uap, egid);
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if (egid != pc->p_rgid && egid != pc->p_svgid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_gid = egid;
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p_sugid(p);
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return (0);
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}
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int
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sys_setregid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setregid_args /* {
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syscallarg(gid_t) rgid;
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syscallarg(gid_t) egid;
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} */ *uap = v;
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struct pcred *pc = p->p_cred;
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gid_t rgid, egid;
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int error;
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rgid = SCARG(uap, rgid);
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egid = SCARG(uap, egid);
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if (rgid != (gid_t)-1 &&
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rgid != pc->p_rgid && rgid != pc->pc_ucred->cr_gid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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if (egid != (gid_t)-1 &&
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egid != pc->p_rgid && egid != pc->pc_ucred->cr_gid &&
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egid != pc->p_svgid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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if (egid != (gid_t)-1) {
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_gid = egid;
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}
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if (rgid != (gid_t)-1) {
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pc->p_rgid = rgid;
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pc->p_svgid = pc->pc_ucred->cr_gid;
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}
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if (egid != (gid_t)-1 && rgid != (gid_t)-1)
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p_sugid(p);
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return (0);
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}
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int
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sys_issetugid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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/*
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* Note: OpenBSD sets a P_SUGIDEXEC flag set at execve() time,
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* we use P_SUGID because we consider changing the owners as
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* "tainting" as well.
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* This is significant for procs that start as root and "become"
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* a user without an exec - programs cannot know *everything*
|
|
* that libc *might* have put in their data segment.
|
|
*/
|
|
*retval = (p->p_flag & P_SUGID) != 0;
|
|
return 0;
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
sys_setgroups(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_setgroups_args /* {
|
|
syscallarg(int) gidsetsize;
|
|
syscallarg(const gid_t *) gidset;
|
|
} */ *uap = v;
|
|
struct pcred *pc = p->p_cred;
|
|
int ngrp;
|
|
int error;
|
|
|
|
if ((error = suser(pc->pc_ucred, &p->p_acflag)) != 0)
|
|
return (error);
|
|
ngrp = SCARG(uap, gidsetsize);
|
|
if ((u_int)ngrp > NGROUPS)
|
|
return (EINVAL);
|
|
pc->pc_ucred = crcopy(pc->pc_ucred);
|
|
error = copyin(SCARG(uap, gidset), pc->pc_ucred->cr_groups,
|
|
ngrp * sizeof(gid_t));
|
|
if (error)
|
|
return (error);
|
|
pc->pc_ucred->cr_ngroups = ngrp;
|
|
p_sugid(p);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check if gid is a member of the group set.
|
|
*/
|
|
int
|
|
groupmember(gid, cred)
|
|
gid_t gid;
|
|
struct ucred *cred;
|
|
{
|
|
gid_t *gp;
|
|
gid_t *egp;
|
|
|
|
egp = &(cred->cr_groups[cred->cr_ngroups]);
|
|
for (gp = cred->cr_groups; gp < egp; gp++)
|
|
if (*gp == gid)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Test whether the specified credentials imply "super-user"
|
|
* privilege; if so, and we have accounting info, set the flag
|
|
* indicating use of super-powers.
|
|
* Returns 0 or error.
|
|
*/
|
|
int
|
|
suser(cred, acflag)
|
|
struct ucred *cred;
|
|
u_short *acflag;
|
|
{
|
|
if (cred->cr_uid == 0) {
|
|
if (acflag)
|
|
*acflag |= ASU;
|
|
return (0);
|
|
}
|
|
return (EPERM);
|
|
}
|
|
|
|
/*
|
|
* Allocate a zeroed cred structure.
|
|
*/
|
|
struct ucred *
|
|
crget()
|
|
{
|
|
struct ucred *cr;
|
|
|
|
MALLOC(cr, struct ucred *, sizeof(*cr), M_CRED, M_WAITOK);
|
|
memset((caddr_t)cr, 0, sizeof(*cr));
|
|
cr->cr_ref = 1;
|
|
return (cr);
|
|
}
|
|
|
|
/*
|
|
* Free a cred structure.
|
|
* Throws away space when ref count gets to 0.
|
|
*/
|
|
void
|
|
crfree(cr)
|
|
struct ucred *cr;
|
|
{
|
|
int s;
|
|
|
|
s = splimp(); /* ??? */
|
|
if (--cr->cr_ref == 0)
|
|
FREE((caddr_t)cr, M_CRED);
|
|
(void) splx(s);
|
|
}
|
|
|
|
/*
|
|
* Copy cred structure to a new one and free the old one.
|
|
*/
|
|
struct ucred *
|
|
crcopy(cr)
|
|
struct ucred *cr;
|
|
{
|
|
struct ucred *newcr;
|
|
|
|
if (cr->cr_ref == 1)
|
|
return (cr);
|
|
newcr = crget();
|
|
*newcr = *cr;
|
|
crfree(cr);
|
|
newcr->cr_ref = 1;
|
|
return (newcr);
|
|
}
|
|
|
|
/*
|
|
* Dup cred struct to a new held one.
|
|
*/
|
|
struct ucred *
|
|
crdup(cr)
|
|
struct ucred *cr;
|
|
{
|
|
struct ucred *newcr;
|
|
|
|
newcr = crget();
|
|
*newcr = *cr;
|
|
newcr->cr_ref = 1;
|
|
return (newcr);
|
|
}
|
|
|
|
/*
|
|
* Get login name, if available.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sys___getlogin(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys___getlogin_args /* {
|
|
syscallarg(char *) namebuf;
|
|
syscallarg(size_t) namelen;
|
|
} */ *uap = v;
|
|
|
|
if (SCARG(uap, namelen) > sizeof(p->p_pgrp->pg_session->s_login))
|
|
SCARG(uap, namelen) = sizeof(p->p_pgrp->pg_session->s_login);
|
|
return (copyout((caddr_t) p->p_pgrp->pg_session->s_login,
|
|
(caddr_t) SCARG(uap, namebuf), SCARG(uap, namelen)));
|
|
}
|
|
|
|
/*
|
|
* Set login name.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sys_setlogin(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_setlogin_args /* {
|
|
syscallarg(const char *) namebuf;
|
|
} */ *uap = v;
|
|
int error;
|
|
|
|
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
|
|
return (error);
|
|
error = copyinstr(SCARG(uap, namebuf), p->p_pgrp->pg_session->s_login,
|
|
sizeof(p->p_pgrp->pg_session->s_login) - 1, (size_t *)0);
|
|
if (error == ENAMETOOLONG)
|
|
error = EINVAL;
|
|
return (error);
|
|
}
|