636 lines
13 KiB
C
636 lines
13 KiB
C
/*
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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 8.6 (Berkeley) 1/21/94
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* $Id: kern_prot.c,v 1.13 1995/10/08 00:06:07 swallace Exp $
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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 <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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struct getpid_args {
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int dummy;
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};
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/* ARGSUSED */
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int
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getpid(p, uap, retval)
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struct proc *p;
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struct getpid_args *uap;
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int *retval;
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{
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*retval = p->p_pid;
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
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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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struct getppid_args {
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int dummy;
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};
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/* ARGSUSED */
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int
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getppid(p, uap, retval)
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struct proc *p;
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struct getppid_args *uap;
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int *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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struct getpgrp_args {
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int dummy;
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};
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int
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getpgrp(p, uap, retval)
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struct proc *p;
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struct getpgrp_args *uap;
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int *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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struct getuid_args {
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int dummy;
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};
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/* ARGSUSED */
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int
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getuid(p, uap, retval)
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struct proc *p;
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struct getuid_args *uap;
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int *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)
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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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struct geteuid_args {
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int dummy;
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};
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/* ARGSUSED */
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int
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geteuid(p, uap, retval)
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struct proc *p;
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struct geteuid_args *uap;
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int *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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struct getgid_args {
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int dummy;
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};
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/* ARGSUSED */
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int
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getgid(p, uap, retval)
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struct proc *p;
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struct getgid_args *uap;
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int *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)
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retval[1] = p->p_ucred->cr_groups[0];
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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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struct getegid_args {
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int dummy;
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};
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/* ARGSUSED */
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int
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getegid(p, uap, retval)
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struct proc *p;
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struct getegid_args *uap;
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int *retval;
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{
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*retval = p->p_ucred->cr_groups[0];
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return (0);
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}
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struct getgroups_args {
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u_int gidsetsize;
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gid_t *gidset;
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};
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int
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getgroups(p, uap, retval)
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struct proc *p;
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register struct getgroups_args *uap;
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int *retval;
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{
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register struct pcred *pc = p->p_cred;
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register u_int ngrp;
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int error;
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if ((ngrp = uap->gidsetsize) == 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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if ((error = copyout((caddr_t)pc->pc_ucred->cr_groups,
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(caddr_t)uap->gidset, ngrp * sizeof(gid_t))))
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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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struct getsid_args {
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int dummy;
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};
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/* ARGSUSED */
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int
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setsid(p, uap, retval)
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register struct proc *p;
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struct getsid_args *uap;
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int *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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* 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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struct setpgid_args {
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int pid; /* target process id */
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int pgid; /* target pgrp id */
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};
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/* ARGSUSED */
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int
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setpgid(curp, uap, retval)
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struct proc *curp;
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register struct setpgid_args *uap;
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int *retval;
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{
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register struct proc *targp; /* target process */
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register struct pgrp *pgrp; /* target pgrp */
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if (uap->pid != 0 && uap->pid != curp->p_pid) {
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if ((targp = pfind(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 (uap->pgid == 0)
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uap->pgid = targp->p_pid;
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else if (uap->pgid != targp->p_pid)
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if ((pgrp = pgfind(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, uap->pgid, 0));
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}
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struct setuid_args {
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uid_t uid;
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};
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/* ARGSUSED */
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int
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setuid(p, uap, retval)
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struct proc *p;
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struct setuid_args *uap;
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int *retval;
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{
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register struct pcred *pc = p->p_cred;
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register uid_t uid;
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int error;
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uid = uap->uid;
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if (uid != pc->p_ruid && uid != 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.
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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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if (pc->pc_ucred->cr_uid == 0 && uid != pc->p_ruid) {
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(void)chgproccnt(pc->p_ruid, -1);
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(void)chgproccnt(uid, 1);
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}
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pc->pc_ucred = crcopy(pc->pc_ucred);
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if (pc->pc_ucred->cr_uid == 0) {
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pc->p_ruid = uid;
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pc->p_svuid = uid;
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}
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pc->pc_ucred->cr_uid = uid;
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p->p_flag |= P_SUGID;
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return (0);
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}
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struct seteuid_args {
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uid_t euid;
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};
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/* ARGSUSED */
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int
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seteuid(p, uap, retval)
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struct proc *p;
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struct seteuid_args *uap;
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int *retval;
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{
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register struct pcred *pc = p->p_cred;
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register uid_t euid;
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int error;
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euid = 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->p_flag |= P_SUGID;
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return (0);
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}
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struct setgid_args {
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gid_t gid;
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};
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/* ARGSUSED */
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int
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setgid(p, uap, retval)
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struct proc *p;
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struct setgid_args *uap;
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int *retval;
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{
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register struct pcred *pc = p->p_cred;
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register gid_t gid;
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int error;
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gid = uap->gid;
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if (gid != pc->p_rgid && gid != 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_groups[0] = gid;
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if (pc->pc_ucred->cr_uid == 0) {
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pc->p_rgid = gid;
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pc->p_svgid = gid;
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}
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p->p_flag |= P_SUGID;
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return (0);
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}
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struct setegid_args {
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gid_t egid;
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};
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/* ARGSUSED */
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int
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setegid(p, uap, retval)
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struct proc *p;
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struct setegid_args *uap;
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int *retval;
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{
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register struct pcred *pc = p->p_cred;
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register gid_t egid;
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int error;
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egid = 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_groups[0] = egid;
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p->p_flag |= P_SUGID;
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return (0);
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}
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struct setgroups_args {
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u_int gidsetsize;
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gid_t *gidset;
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};
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/* ARGSUSED */
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int
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setgroups(p, uap, retval)
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struct proc *p;
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struct setgroups_args *uap;
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int *retval;
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{
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register struct pcred *pc = p->p_cred;
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register u_int ngrp;
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int error;
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if ((error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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ngrp = uap->gidsetsize;
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if (ngrp < 1 || ngrp > NGROUPS)
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return (EINVAL);
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pc->pc_ucred = crcopy(pc->pc_ucred);
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if ((error = copyin((caddr_t)uap->gidset,
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(caddr_t)pc->pc_ucred->cr_groups, ngrp * sizeof(gid_t))))
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return (error);
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pc->pc_ucred->cr_ngroups = ngrp;
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p->p_flag |= P_SUGID;
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return (0);
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}
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struct setreuid_args {
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uid_t ruid;
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uid_t euid;
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};
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/* ARGSUSED */
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int
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setreuid(p, uap, retval)
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register struct proc *p;
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struct setreuid_args *uap;
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int *retval;
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{
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register struct pcred *pc = p->p_cred;
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register uid_t ruid, euid;
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int error;
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ruid = uap->ruid;
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euid = uap->euid;
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if ((ruid != (uid_t)-1 && ruid != pc->p_ruid && ruid != pc->p_svuid ||
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euid != (uid_t)-1 && 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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pc->pc_ucred = crcopy(pc->pc_ucred);
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if (euid != (uid_t)-1)
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pc->pc_ucred->cr_uid = euid;
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if (ruid != (uid_t)-1 && ruid != pc->p_ruid) {
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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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}
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if (ruid != (uid_t)-1 || pc->pc_ucred->cr_uid != pc->p_ruid)
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pc->p_svuid = pc->pc_ucred->cr_uid;
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p->p_flag |= P_SUGID;
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return (0);
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}
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struct setregid_args {
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gid_t rgid;
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gid_t egid;
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};
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/* ARGSUSED */
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int
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setregid(p, uap, retval)
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register struct proc *p;
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struct setregid_args *uap;
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int *retval;
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{
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register struct pcred *pc = p->p_cred;
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register gid_t rgid, egid;
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int error;
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rgid = uap->rgid;
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egid = uap->egid;
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if ((rgid != (gid_t)-1 && rgid != pc->p_rgid && rgid != pc->p_svgid ||
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egid != (gid_t)-1 && 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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if (egid != (gid_t)-1)
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pc->pc_ucred->cr_groups[0] = egid;
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if (rgid != (gid_t)-1)
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pc->p_rgid = rgid;
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if (rgid != (gid_t)-1 || pc->pc_ucred->cr_groups[0] != pc->p_rgid)
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pc->p_svgid = pc->pc_ucred->cr_groups[0];
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p->p_flag |= P_SUGID;
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return (0);
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}
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/*
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* Check if gid is a member of the group set.
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*/
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int
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groupmember(gid, cred)
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gid_t gid;
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register struct ucred *cred;
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{
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register gid_t *gp;
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gid_t *egp;
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egp = &(cred->cr_groups[cred->cr_ngroups]);
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for (gp = cred->cr_groups; gp < egp; gp++)
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if (*gp == gid)
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return (1);
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return (0);
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}
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/*
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* Test whether the specified credentials imply "super-user"
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* privilege; if so, and we have accounting info, set the flag
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* indicating use of super-powers.
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* Returns 0 or error.
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*/
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int
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suser(cred, acflag)
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struct ucred *cred;
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u_short *acflag;
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{
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if (cred->cr_uid == 0) {
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if (acflag)
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*acflag |= ASU;
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return (0);
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}
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return (EPERM);
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}
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/*
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* Allocate a zeroed cred structure.
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*/
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struct ucred *
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crget()
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|
{
|
|
register struct ucred *cr;
|
|
|
|
MALLOC(cr, struct ucred *, sizeof(*cr), M_CRED, M_WAITOK);
|
|
bzero((caddr_t)cr, 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.
|
|
*/
|
|
struct getlogin_args {
|
|
char *namebuf;
|
|
u_int namelen;
|
|
};
|
|
/* ARGSUSED */
|
|
int
|
|
getlogin(p, uap, retval)
|
|
struct proc *p;
|
|
struct getlogin_args *uap;
|
|
int *retval;
|
|
{
|
|
|
|
if (uap->namelen > sizeof (p->p_pgrp->pg_session->s_login))
|
|
uap->namelen = sizeof (p->p_pgrp->pg_session->s_login);
|
|
return (copyout((caddr_t) p->p_pgrp->pg_session->s_login,
|
|
(caddr_t) uap->namebuf, uap->namelen));
|
|
}
|
|
|
|
/*
|
|
* Set login name.
|
|
*/
|
|
struct setlogin_args {
|
|
char *namebuf;
|
|
};
|
|
/* ARGSUSED */
|
|
int
|
|
setlogin(p, uap, retval)
|
|
struct proc *p;
|
|
struct setlogin_args *uap;
|
|
int *retval;
|
|
{
|
|
int error;
|
|
|
|
if ((error = suser(p->p_ucred, &p->p_acflag)))
|
|
return (error);
|
|
error = copyinstr((caddr_t) uap->namebuf,
|
|
(caddr_t) p->p_pgrp->pg_session->s_login,
|
|
sizeof (p->p_pgrp->pg_session->s_login) - 1, (u_int *)0);
|
|
if (error == ENAMETOOLONG)
|
|
error = EINVAL;
|
|
return (error);
|
|
}
|