177142e458
for mac_check_vnode_{poll,read,stat,write}(). Pass in fp->f_cred
when calling these checks with a struct file available. Otherwise,
pass NOCRED. All currently MAC policies use active_cred, but
could now offer the cached credential semantic used for the base
system security model.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
285 lines
7.0 KiB
C
285 lines
7.0 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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/* XXX: Shouldn't this cred be td->td_ucred not NOCRED? */
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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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error = mac_check_vnode_read(td->td_ucred, NOCRED, ttyvp);
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if (error == 0)
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#endif
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/* XXX: Shouldn't this cred be td->td_ucred not NOCRED? */
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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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error = mac_check_vnode_write(td->td_ucred, NOCRED, ttyvp);
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if (error == 0)
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#endif
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/* XXX: shouldn't this cred be td->td_ucred not NOCRED? */
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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, NOCRED, 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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