1a7cd1a210
mac_check_vnode_poll(), mac_check_vnode_read(), mac_check_vnode_write(). This improves the consistency with other existing vnode checks, and allows policies to avoid implementing switch statements to determine what operations they do and do not want to authorize. Obtained from: TrustedBSD Project Sponsored by: DARPA, NAI Labs
284 lines
6.9 KiB
C
284 lines
6.9 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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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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* @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
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* $FreeBSD$
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*/
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/*
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* Indirect driver for controlling tty.
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*/
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mac.h>
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#include <sys/mutex.h>
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#include <sys/sx.h>
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#include <sys/proc.h>
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#include <sys/ttycom.h>
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#include <sys/vnode.h>
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static d_open_t cttyopen;
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static d_read_t cttyread;
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static d_write_t cttywrite;
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static d_ioctl_t cttyioctl;
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static d_poll_t cttypoll;
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#define CDEV_MAJOR 1
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static struct cdevsw ctty_cdevsw = {
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/* open */ cttyopen,
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/* close */ nullclose,
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/* read */ cttyread,
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/* write */ cttywrite,
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/* ioctl */ cttyioctl,
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/* poll */ cttypoll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "ctty",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ D_TTY,
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};
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#define cttyvp(td) ((td)->td_proc->p_flag & P_CONTROLT ? (td)->td_proc->p_session->s_ttyvp : NULL)
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/*ARGSUSED*/
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static int
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cttyopen(dev, flag, mode, td)
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dev_t dev;
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int flag, mode;
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struct thread *td;
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{
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struct vnode *ttyvp;
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int error;
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PROC_LOCK(td->td_proc);
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SESS_LOCK(td->td_proc->p_session);
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ttyvp = cttyvp(td);
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SESS_UNLOCK(td->td_proc->p_session);
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PROC_UNLOCK(td->td_proc);
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if (ttyvp == NULL)
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return (ENXIO);
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vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
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#ifdef MAC
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error = mac_check_vnode_open(td->td_ucred, ttyvp, flag);
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if (error) {
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VOP_UNLOCK(ttyvp, 0, td);
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return (error);
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}
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#endif
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error = VOP_OPEN(ttyvp, flag, NOCRED, td);
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VOP_UNLOCK(ttyvp, 0, td);
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return (error);
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}
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/*ARGSUSED*/
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static int
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cttyread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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struct thread *td = uio->uio_td;
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register struct vnode *ttyvp;
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int error;
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PROC_LOCK(td->td_proc);
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SESS_LOCK(td->td_proc->p_session);
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ttyvp = cttyvp(td);
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SESS_UNLOCK(td->td_proc->p_session);
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PROC_UNLOCK(td->td_proc);
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if (ttyvp == NULL)
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return (EIO);
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vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
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#ifdef MAC
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/* XXX: Shouldn't the cred below be td->td_ucred not NOCRED? */
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error = mac_check_vnode_read(td->td_ucred, ttyvp);
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if (error == 0)
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#endif
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error = VOP_READ(ttyvp, uio, flag, NOCRED);
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VOP_UNLOCK(ttyvp, 0, td);
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return (error);
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}
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/*ARGSUSED*/
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static int
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cttywrite(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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struct thread *td = uio->uio_td;
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struct vnode *ttyvp;
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struct mount *mp;
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int error;
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PROC_LOCK(td->td_proc);
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SESS_LOCK(td->td_proc->p_session);
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ttyvp = cttyvp(td);
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SESS_UNLOCK(td->td_proc->p_session);
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PROC_UNLOCK(td->td_proc);
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if (ttyvp == NULL)
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return (EIO);
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mp = NULL;
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if (ttyvp->v_type != VCHR &&
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(error = vn_start_write(ttyvp, &mp, V_WAIT | PCATCH)) != 0)
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return (error);
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vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
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#ifdef MAC
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/* XXX: shouldn't the cred below be td->td_ucred not NOCRED? */
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error = mac_check_vnode_write(td->td_ucred, ttyvp);
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if (error == 0)
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#endif
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error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
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VOP_UNLOCK(ttyvp, 0, td);
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vn_finished_write(mp);
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return (error);
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}
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/*ARGSUSED*/
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static int
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cttyioctl(dev, cmd, addr, flag, td)
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dev_t dev;
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u_long cmd;
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caddr_t addr;
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int flag;
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struct thread *td;
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{
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struct vnode *ttyvp;
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int error;
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PROC_LOCK(td->td_proc);
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SESS_LOCK(td->td_proc->p_session);
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ttyvp = cttyvp(td);
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SESS_UNLOCK(td->td_proc->p_session);
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PROC_UNLOCK(td->td_proc);
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if (ttyvp == NULL)
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return (EIO);
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if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
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return EINVAL; /* to controlling tty -- infinite recursion */
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if (cmd == TIOCNOTTY) {
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PROC_LOCK(td->td_proc);
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SESS_LOCK(td->td_proc->p_session);
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error = 0;
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if (!SESS_LEADER(td->td_proc))
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td->td_proc->p_flag &= ~P_CONTROLT;
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else
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error = EINVAL;
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SESS_UNLOCK(td->td_proc->p_session);
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PROC_UNLOCK(td->td_proc);
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return (error);
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}
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/* XXXMAC: Should this be td->td_ucred below? */
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return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, td));
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}
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/*ARGSUSED*/
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static int
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cttypoll(dev, events, td)
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dev_t dev;
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int events;
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struct thread *td;
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{
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struct vnode *ttyvp;
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#ifdef MAC
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int error;
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#endif
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PROC_LOCK(td->td_proc);
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SESS_LOCK(td->td_proc->p_session);
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ttyvp = cttyvp(td);
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SESS_UNLOCK(td->td_proc->p_session);
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PROC_UNLOCK(td->td_proc);
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if (ttyvp == NULL)
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/* try operation to get EOF/failure */
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return (seltrue(dev, events, td));
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#ifdef MAC
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vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
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error = mac_check_vnode_poll(td->td_ucred, ttyvp);
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VOP_UNLOCK(ttyvp, 0, td);
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if (error)
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return (error);
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#endif
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return (VOP_POLL(ttyvp, events, td->td_ucred, td));
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}
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static void ctty_clone(void *arg, char *name, int namelen, dev_t *dev);
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static dev_t ctty;
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static void
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ctty_clone(void *arg, char *name, int namelen, dev_t *dev)
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{
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struct vnode *vp;
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if (*dev != NODEV)
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return;
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if (strcmp(name, "tty"))
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return;
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vp = cttyvp(curthread);
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if (vp == NULL) {
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if (ctty)
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*dev = ctty;
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} else
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*dev = vp->v_rdev;
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}
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static void ctty_drvinit(void *unused);
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static void
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ctty_drvinit(unused)
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void *unused;
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{
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if (devfs_present) {
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EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000);
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ctty = make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "ctty");
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} else {
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make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "tty");
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}
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}
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SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
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