157 lines
4.5 KiB
C
157 lines
4.5 KiB
C
/* $OpenBSD: tty_tty.c,v 1.32 2022/08/14 01:58:28 jsg Exp $ */
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/* $NetBSD: tty_tty.c,v 1.13 1996/03/30 22:24:46 christos Exp $ */
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/*-
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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. 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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*/
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/*
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* Indirect driver for controlling tty.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/tty.h>
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#include <sys/vnode.h>
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#include <sys/lock.h>
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#include <sys/fcntl.h>
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#define cttyvp(p) \
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((p)->p_p->ps_flags & PS_CONTROLT ? \
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(p)->p_p->ps_session->s_ttyvp : NULL)
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int
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cttyopen(dev_t dev, int flag, int mode, struct proc *p)
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{
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struct vnode *ttyvp = cttyvp(p);
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int error;
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if (ttyvp == NULL)
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return (ENXIO);
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vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
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error = VOP_OPEN(ttyvp, flag, NOCRED, p);
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VOP_UNLOCK(ttyvp);
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return (error);
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}
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int
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cttyread(dev_t dev, struct uio *uio, int flag)
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{
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struct vnode *ttyvp = cttyvp(uio->uio_procp);
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int error;
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if (ttyvp == NULL)
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return (EIO);
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vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
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error = VOP_READ(ttyvp, uio, flag, NOCRED);
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VOP_UNLOCK(ttyvp);
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return (error);
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}
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int
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cttywrite(dev_t dev, struct uio *uio, int flag)
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{
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struct vnode *ttyvp = cttyvp(uio->uio_procp);
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int error;
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if (ttyvp == NULL)
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return (EIO);
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vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
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error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
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VOP_UNLOCK(ttyvp);
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return (error);
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}
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int
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cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
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{
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struct vnode *ttyvp = cttyvp(p);
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struct session *sess;
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int error, secs;
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if (ttyvp == NULL)
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return (EIO);
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if (cmd == TIOCSCTTY) /* XXX */
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return (EINVAL);
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if (cmd == TIOCNOTTY) {
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if (!SESS_LEADER(p->p_p)) {
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atomic_clearbits_int(&p->p_p->ps_flags, PS_CONTROLT);
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return (0);
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} else
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return (EINVAL);
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}
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switch (cmd) {
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case TIOCSETVERAUTH:
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if ((error = suser(p)))
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return error;
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secs = *(int *)addr;
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if (secs < 1 || secs > 3600)
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return EINVAL;
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sess = p->p_p->ps_pgrp->pg_session;
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sess->s_verauthuid = p->p_ucred->cr_ruid;
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sess->s_verauthppid = p->p_p->ps_pptr->ps_pid;
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timeout_add_sec(&sess->s_verauthto, secs);
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return 0;
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case TIOCCLRVERAUTH:
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sess = p->p_p->ps_pgrp->pg_session;
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timeout_del(&sess->s_verauthto);
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zapverauth(sess);
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return 0;
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case TIOCCHKVERAUTH:
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/*
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* It's not clear when or what these checks are for.
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* How can we reach this code with a different ruid?
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* The ppid check is also more porous than desired.
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* Nevertheless, the checks reflect the original intention;
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* namely, that it be the same user using the same shell.
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*/
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sess = p->p_p->ps_pgrp->pg_session;
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if (sess->s_verauthuid == p->p_ucred->cr_ruid &&
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sess->s_verauthppid == p->p_p->ps_pptr->ps_pid)
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return 0;
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return EPERM;
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}
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return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
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}
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int
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cttykqfilter(dev_t dev, struct knote *kn)
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{
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struct vnode *ttyvp = cttyvp(curproc);
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if (ttyvp == NULL) {
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if (kn->kn_flags & (__EV_POLL | __EV_SELECT))
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return (seltrue_kqfilter(dev, kn));
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return (ENXIO);
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}
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return (VOP_KQFILTER(ttyvp, FREAD|FWRITE, kn));
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}
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