796 lines
16 KiB
C
796 lines
16 KiB
C
/* $NetBSD: sys_term.c,v 1.44 2007/01/17 21:44:50 hubertf Exp $ */
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/*
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* Copyright (c) 1989, 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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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)sys_term.c 8.4+1 (Berkeley) 5/30/95";
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#else
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__RCSID("$NetBSD: sys_term.c,v 1.44 2007/01/17 21:44:50 hubertf Exp $");
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#endif
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#endif /* not lint */
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#include "telnetd.h"
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#include "pathnames.h"
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#include <util.h>
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#include <vis.h>
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#include <utmp.h>
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struct utmp wtmp;
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#define SCPYN(a, b) (void) strncpy(a, b, sizeof(a))
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#define SCMPN(a, b) strncmp(a, b, sizeof(a))
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struct termios termbuf, termbuf2; /* pty control structure */
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void getptyslave(void);
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int cleanopen(char *);
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char **addarg(char **, char *);
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void scrub_env(void);
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int getent(char *, char *);
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char *getstr(const char *, char **);
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#ifdef KRB5
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extern void kerberos5_cleanup(void);
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#endif
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/*
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* init_termbuf()
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* copy_termbuf(cp)
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* set_termbuf()
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*
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* These three routines are used to get and set the "termbuf" structure
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* to and from the kernel. init_termbuf() gets the current settings.
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* copy_termbuf() hands in a new "termbuf" to write to the kernel, and
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* set_termbuf() writes the structure into the kernel.
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*/
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void
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init_termbuf(void)
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{
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(void) tcgetattr(pty, &termbuf);
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termbuf2 = termbuf;
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}
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#if defined(LINEMODE) && defined(TIOCPKT_IOCTL)
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void
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copy_termbuf(char *cp, int len)
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{
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if (len > sizeof(termbuf))
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len = sizeof(termbuf);
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memmove((char *)&termbuf, cp, len);
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termbuf2 = termbuf;
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}
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#endif /* defined(LINEMODE) && defined(TIOCPKT_IOCTL) */
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void
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set_termbuf(void)
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{
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/*
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* Only make the necessary changes.
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*/
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if (memcmp((char *)&termbuf, (char *)&termbuf2, sizeof(termbuf)))
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(void) tcsetattr(pty, TCSANOW, &termbuf);
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}
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/*
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* spcset(func, valp, valpp)
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*
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* This function takes various special characters (func), and
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* sets *valp to the current value of that character, and
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* *valpp to point to where in the "termbuf" structure that
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* value is kept.
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*
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* It returns the SLC_ level of support for this function.
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*/
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int
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spcset(int func, cc_t *valp, cc_t **valpp)
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{
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#define setval(a, b) *valp = termbuf.c_cc[a]; \
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*valpp = &termbuf.c_cc[a]; \
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return(b);
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#define defval(a) *valp = ((cc_t)a); *valpp = (cc_t *)0; return(SLC_DEFAULT);
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switch(func) {
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case SLC_EOF:
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setval(VEOF, SLC_VARIABLE);
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case SLC_EC:
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setval(VERASE, SLC_VARIABLE);
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case SLC_EL:
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setval(VKILL, SLC_VARIABLE);
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case SLC_IP:
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setval(VINTR, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
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case SLC_ABORT:
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setval(VQUIT, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
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case SLC_XON:
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setval(VSTART, SLC_VARIABLE);
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case SLC_XOFF:
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setval(VSTOP, SLC_VARIABLE);
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case SLC_EW:
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setval(VWERASE, SLC_VARIABLE);
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case SLC_RP:
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setval(VREPRINT, SLC_VARIABLE);
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case SLC_LNEXT:
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setval(VLNEXT, SLC_VARIABLE);
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case SLC_AO:
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setval(VDISCARD, SLC_VARIABLE|SLC_FLUSHOUT);
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case SLC_SUSP:
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setval(VSUSP, SLC_VARIABLE|SLC_FLUSHIN);
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case SLC_FORW1:
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setval(VEOL, SLC_VARIABLE);
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case SLC_FORW2:
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setval(VEOL2, SLC_VARIABLE);
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case SLC_AYT:
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setval(VSTATUS, SLC_VARIABLE);
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case SLC_BRK:
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case SLC_SYNCH:
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case SLC_EOR:
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defval(0);
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default:
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*valp = 0;
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*valpp = 0;
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return(SLC_NOSUPPORT);
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}
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}
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/*
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* getpty()
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*
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* Allocate a pty. As a side effect, the external character
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* array "line" contains the name of the slave side.
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*
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* Returns the file descriptor of the opened pty.
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*/
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#ifndef __GNUC__
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char *line = NULL16STR;
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#else
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static char Xline[] = NULL16STR;
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char *line = Xline;
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#endif
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static int ptyslavefd; /* for cleanopen() */
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int
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getpty(int *ptynum)
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{
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int ptyfd;
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ptyfd = openpty(ptynum, &ptyslavefd, line, NULL, NULL);
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if (ptyfd == 0)
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return *ptynum;
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ptyslavefd = -1;
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return (-1);
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}
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#ifdef LINEMODE
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/*
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* tty_flowmode() Find out if flow control is enabled or disabled.
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* tty_linemode() Find out if linemode (external processing) is enabled.
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* tty_setlinemod(on) Turn on/off linemode.
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* tty_isecho() Find out if echoing is turned on.
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* tty_setecho(on) Enable/disable character echoing.
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* tty_israw() Find out if terminal is in RAW mode.
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* tty_binaryin(on) Turn on/off BINARY on input.
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* tty_binaryout(on) Turn on/off BINARY on output.
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* tty_isediting() Find out if line editing is enabled.
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* tty_istrapsig() Find out if signal trapping is enabled.
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* tty_setedit(on) Turn on/off line editing.
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* tty_setsig(on) Turn on/off signal trapping.
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* tty_issofttab() Find out if tab expansion is enabled.
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* tty_setsofttab(on) Turn on/off soft tab expansion.
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* tty_islitecho() Find out if typed control chars are echoed literally
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* tty_setlitecho() Turn on/off literal echo of control chars
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* tty_tspeed(val) Set transmit speed to val.
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* tty_rspeed(val) Set receive speed to val.
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*/
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int
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tty_linemode(void)
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{
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return(termbuf.c_lflag & EXTPROC);
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}
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void
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tty_setlinemode(int on)
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{
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set_termbuf();
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(void) ioctl(pty, TIOCEXT, (char *)&on);
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init_termbuf();
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}
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#endif /* LINEMODE */
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int
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tty_isecho(void)
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{
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return (termbuf.c_lflag & ECHO);
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}
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int
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tty_flowmode(void)
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{
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return((termbuf.c_iflag & IXON) ? 1 : 0);
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}
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int
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tty_restartany(void)
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{
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return((termbuf.c_iflag & IXANY) ? 1 : 0);
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}
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void
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tty_setecho(int on)
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{
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if (on)
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termbuf.c_lflag |= ECHO;
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else
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termbuf.c_lflag &= ~ECHO;
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}
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int
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tty_israw(void)
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{
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return(!(termbuf.c_lflag & ICANON));
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}
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void
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tty_binaryin(int on)
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{
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if (on) {
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termbuf.c_iflag &= ~ISTRIP;
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} else {
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termbuf.c_iflag |= ISTRIP;
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}
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}
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void
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tty_binaryout(int on)
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{
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if (on) {
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termbuf.c_cflag &= ~(CSIZE|PARENB);
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termbuf.c_cflag |= CS8;
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termbuf.c_oflag &= ~OPOST;
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} else {
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termbuf.c_cflag &= ~CSIZE;
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termbuf.c_cflag |= CS7|PARENB;
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termbuf.c_oflag |= OPOST;
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}
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}
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int
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tty_isbinaryin(void)
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{
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return(!(termbuf.c_iflag & ISTRIP));
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}
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int
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tty_isbinaryout(void)
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{
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return(!(termbuf.c_oflag&OPOST));
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}
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#ifdef LINEMODE
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int
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tty_isediting(void)
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{
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return(termbuf.c_lflag & ICANON);
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}
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int
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tty_istrapsig(void)
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{
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return(termbuf.c_lflag & ISIG);
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}
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void
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tty_setedit(int on)
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{
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if (on)
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termbuf.c_lflag |= ICANON;
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else
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termbuf.c_lflag &= ~ICANON;
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}
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void
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tty_setsig(int on)
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{
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if (on)
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termbuf.c_lflag |= ISIG;
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else
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termbuf.c_lflag &= ~ISIG;
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}
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#endif /* LINEMODE */
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int
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tty_issofttab(void)
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{
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# ifdef OXTABS
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return (termbuf.c_oflag & OXTABS);
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# endif
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# ifdef TABDLY
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return ((termbuf.c_oflag & TABDLY) == TAB3);
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# endif
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}
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void
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tty_setsofttab(int on)
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{
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if (on) {
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# ifdef OXTABS
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termbuf.c_oflag |= OXTABS;
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# endif
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# ifdef TABDLY
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termbuf.c_oflag &= ~TABDLY;
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termbuf.c_oflag |= TAB3;
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# endif
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} else {
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# ifdef OXTABS
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termbuf.c_oflag &= ~OXTABS;
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# endif
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# ifdef TABDLY
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termbuf.c_oflag &= ~TABDLY;
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termbuf.c_oflag |= TAB0;
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# endif
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}
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}
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int
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tty_islitecho(void)
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{
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# ifdef ECHOCTL
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return (!(termbuf.c_lflag & ECHOCTL));
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# endif
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# ifdef TCTLECH
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return (!(termbuf.c_lflag & TCTLECH));
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# endif
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# if !defined(ECHOCTL) && !defined(TCTLECH)
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return (0); /* assumes ctl chars are echoed '^x' */
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# endif
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}
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void
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tty_setlitecho(int on)
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{
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# ifdef ECHOCTL
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if (on)
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termbuf.c_lflag &= ~ECHOCTL;
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else
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termbuf.c_lflag |= ECHOCTL;
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# endif
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# ifdef TCTLECH
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if (on)
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termbuf.c_lflag &= ~TCTLECH;
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else
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termbuf.c_lflag |= TCTLECH;
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# endif
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}
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int
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tty_iscrnl(void)
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{
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return (termbuf.c_iflag & ICRNL);
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}
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void
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tty_tspeed(int val)
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{
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cfsetospeed(&termbuf, val);
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}
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void
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tty_rspeed(int val)
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{
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cfsetispeed(&termbuf, val);
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}
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/*
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* getptyslave()
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*
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* Open the slave side of the pty, and do any initialization
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* that is necessary. The return value is a file descriptor
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* for the slave side.
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*/
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extern int def_tspeed, def_rspeed;
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extern int def_row, def_col;
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void
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getptyslave(void)
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{
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int t = -1;
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#ifdef LINEMODE
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int waslm;
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#endif
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struct winsize ws;
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/*
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* Opening the slave side may cause initilization of the
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* kernel tty structure. We need remember the state of
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* if linemode was turned on
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* terminal window size
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* terminal speed
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* so that we can re-set them if we need to.
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*/
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#ifdef LINEMODE
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waslm = tty_linemode();
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#endif
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/*
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* Make sure that we don't have a controlling tty, and
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* that we are the session (process group) leader.
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*/
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t = open(_PATH_TTY, O_RDWR);
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if (t >= 0) {
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(void) ioctl(t, TIOCNOTTY, (char *)0);
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(void) close(t);
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}
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t = cleanopen(line);
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if (t < 0)
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fatalperror(net, line);
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/*
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* set up the tty modes as we like them to be.
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*/
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init_termbuf();
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if (def_row || def_col) {
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memset((char *)&ws, 0, sizeof(ws));
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ws.ws_col = def_col;
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ws.ws_row = def_row;
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(void)ioctl(t, TIOCSWINSZ, (char *)&ws);
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}
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/*
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* Settings for sgtty based systems
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*/
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/*
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* Settings for all other termios/termio based
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* systems, other than 4.4BSD. In 4.4BSD the
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* kernel does the initial terminal setup.
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*/
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tty_rspeed((def_rspeed > 0) ? def_rspeed : 9600);
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tty_tspeed((def_tspeed > 0) ? def_tspeed : 9600);
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#ifdef LINEMODE
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if (waslm)
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tty_setlinemode(1);
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#endif /* LINEMODE */
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/*
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* Set the tty modes, and make this our controlling tty.
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*/
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set_termbuf();
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if (login_tty(t) == -1)
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fatalperror(net, "login_tty");
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if (net > 2)
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(void) close(net);
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if (pty > 2) {
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(void) close(pty);
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pty = -1;
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}
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}
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/*
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* Open the specified slave side of the pty,
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* making sure that we have a clean tty.
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*/
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int
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cleanopen(char *ttyline)
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{
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return ptyslavefd;
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}
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/*
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* startslave(host)
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*
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* Given a hostname, do whatever
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* is necessary to startup the login process on the slave side of the pty.
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*/
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/* ARGSUSED */
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void
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startslave(char *host, int autologin, char *autoname)
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{
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int i;
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#ifdef AUTHENTICATION
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if (!autoname || !autoname[0])
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autologin = 0;
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if (autologin < auth_level) {
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fatal(net, "Authorization failed");
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exit(1);
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}
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#endif
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if ((i = fork()) < 0)
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fatalperror(net, "fork");
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if (i) {
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} else {
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getptyslave();
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start_login(host, autologin, autoname);
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/*NOTREACHED*/
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}
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}
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char *envinit[3];
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void
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init_env(void)
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{
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char **envp;
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|
|
envp = envinit;
|
|
if ((*envp = getenv("TZ")))
|
|
*envp++ -= 3;
|
|
*envp = 0;
|
|
environ = envinit;
|
|
}
|
|
|
|
|
|
/*
|
|
* start_login(host)
|
|
*
|
|
* Assuming that we are now running as a child processes, this
|
|
* function will turn us into the login process.
|
|
*/
|
|
extern char *gettyname;
|
|
|
|
void
|
|
start_login(char *host, int autologin, char *name)
|
|
{
|
|
char **argv;
|
|
#define TABBUFSIZ 512
|
|
char defent[TABBUFSIZ];
|
|
char defstrs[TABBUFSIZ];
|
|
#undef TABBUFSIZ
|
|
const char *loginprog = NULL;
|
|
extern struct sockaddr_storage from;
|
|
char buf[sizeof(from) * 4 + 1];
|
|
|
|
scrub_env();
|
|
|
|
/*
|
|
* -a : pass on the address of the host.
|
|
* -h : pass on name of host.
|
|
* WARNING: -h and -a are accepted by login
|
|
* if and only if getuid() == 0.
|
|
* -p : don't clobber the environment (so terminal type stays set).
|
|
*
|
|
* -f : force this login, he has already been authenticated
|
|
*/
|
|
argv = addarg(0, "login");
|
|
|
|
argv = addarg(argv, "-a");
|
|
(void)strvisx(buf, (const char *)(const void *)&from, sizeof(from),
|
|
VIS_WHITE);
|
|
argv = addarg(argv, buf);
|
|
|
|
argv = addarg(argv, "-h");
|
|
argv = addarg(argv, host);
|
|
|
|
argv = addarg(argv, "-p");
|
|
#ifdef LINEMODE
|
|
/*
|
|
* Set the environment variable "LINEMODE" to either
|
|
* "real" or "kludge" if we are operating in either
|
|
* real or kludge linemode.
|
|
*/
|
|
if (lmodetype == REAL_LINEMODE)
|
|
setenv("LINEMODE", "real", 1);
|
|
# ifdef KLUDGELINEMODE
|
|
else if (lmodetype == KLUDGE_LINEMODE || lmodetype == KLUDGE_OK)
|
|
setenv("LINEMODE", "kludge", 1);
|
|
# endif
|
|
#endif
|
|
#ifdef SECURELOGIN
|
|
/*
|
|
* don't worry about the -f that might get sent.
|
|
* A -s is supposed to override it anyhow.
|
|
*/
|
|
if (require_secure_login)
|
|
argv = addarg(argv, "-s");
|
|
#endif
|
|
#ifdef AUTHENTICATION
|
|
if (auth_level >= 0 && autologin == AUTH_VALID) {
|
|
argv = addarg(argv, "-f");
|
|
argv = addarg(argv, "--");
|
|
argv = addarg(argv, name);
|
|
} else
|
|
#endif
|
|
if (getenv("USER")) {
|
|
argv = addarg(argv, "--");
|
|
argv = addarg(argv, getenv("USER"));
|
|
/*
|
|
* Assume that login will set the USER variable
|
|
* correctly. For SysV systems, this means that
|
|
* USER will no longer be set, just LOGNAME by
|
|
* login. (The problem is that if the auto-login
|
|
* fails, and the user then specifies a different
|
|
* account name, he can get logged in with both
|
|
* LOGNAME and USER in his environment, but the
|
|
* USER value will be wrong.
|
|
*/
|
|
unsetenv("USER");
|
|
}
|
|
if (getent(defent, gettyname) == 1) {
|
|
char *cp = defstrs;
|
|
|
|
loginprog = getstr("lo", &cp);
|
|
}
|
|
if (loginprog == NULL)
|
|
loginprog = _PATH_LOGIN;
|
|
closelog();
|
|
/*
|
|
* This sleep(1) is in here so that telnetd can
|
|
* finish up with the tty. There's a race condition
|
|
* the login banner message gets lost...
|
|
*/
|
|
sleep(1);
|
|
execv(loginprog, argv);
|
|
|
|
syslog(LOG_ERR, "%s: %m", loginprog);
|
|
fatalperror(net, loginprog);
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
char **
|
|
addarg(char **argv, char *val)
|
|
{
|
|
char **cpp;
|
|
char **nargv;
|
|
|
|
if (argv == NULL) {
|
|
/*
|
|
* 10 entries, a leading length, and a null
|
|
*/
|
|
argv = (char **)malloc(sizeof(*argv) * 12);
|
|
if (argv == NULL)
|
|
return(NULL);
|
|
*argv++ = (char *)10;
|
|
*argv = (char *)0;
|
|
}
|
|
for (cpp = argv; *cpp; cpp++)
|
|
;
|
|
if (cpp == &argv[(long)argv[-1]]) {
|
|
--argv;
|
|
nargv = (char **)realloc(argv,
|
|
sizeof(*argv) * ((long)(*argv) + 10 + 2));
|
|
if (argv == NULL) {
|
|
fatal(net, "not enough memory");
|
|
/*NOTREACHED*/
|
|
}
|
|
argv = nargv;
|
|
*argv = (char *)((long)(*argv) + 10);
|
|
argv++;
|
|
cpp = &argv[(long)argv[-1] - 10];
|
|
}
|
|
*cpp++ = val;
|
|
*cpp = 0;
|
|
return(argv);
|
|
}
|
|
|
|
/*
|
|
* scrub_env()
|
|
*
|
|
* We only accept the environment variables listed below.
|
|
*/
|
|
|
|
void
|
|
scrub_env(void)
|
|
{
|
|
static const char *reject[] = {
|
|
"TERMCAP=/",
|
|
NULL
|
|
};
|
|
|
|
static const char *acceptstr[] = {
|
|
"XAUTH=", "XAUTHORITY=", "DISPLAY=",
|
|
"TERM=",
|
|
"EDITOR=",
|
|
"PAGER=",
|
|
"LOGNAME=",
|
|
"POSIXLY_CORRECT=",
|
|
"TERMCAP=",
|
|
"PRINTER=",
|
|
NULL
|
|
};
|
|
|
|
char **cpp, **cpp2;
|
|
const char **p;
|
|
|
|
for (cpp2 = cpp = environ; *cpp; cpp++) {
|
|
int reject_it = 0;
|
|
|
|
for(p = reject; *p; p++)
|
|
if(strncmp(*cpp, *p, strlen(*p)) == 0) {
|
|
reject_it = 1;
|
|
break;
|
|
}
|
|
if (reject_it)
|
|
continue;
|
|
|
|
for(p = acceptstr; *p; p++)
|
|
if(strncmp(*cpp, *p, strlen(*p)) == 0)
|
|
break;
|
|
if(*p != NULL)
|
|
*cpp2++ = *cpp;
|
|
}
|
|
*cpp2 = NULL;
|
|
}
|
|
|
|
/*
|
|
* cleanup()
|
|
*
|
|
* This is the routine to call when we are all through, to
|
|
* clean up anything that needs to be cleaned up.
|
|
*/
|
|
/* ARGSUSED */
|
|
void
|
|
cleanup(int sig)
|
|
{
|
|
char *p, c;
|
|
|
|
p = line + sizeof(_PATH_DEV) - 1;
|
|
#ifdef SUPPORT_UTMP
|
|
if (logout(p))
|
|
logwtmp(p, "", "");
|
|
#endif
|
|
#ifdef SUPPORT_UTMPX
|
|
if (logoutx(p, 0, DEAD_PROCESS))
|
|
logwtmpx(p, "", "", 0, DEAD_PROCESS);
|
|
#endif
|
|
(void)chmod(line, 0666);
|
|
(void)chown(line, 0, 0);
|
|
c = *p; *p = 'p';
|
|
(void)chmod(line, 0666);
|
|
(void)chown(line, 0, 0);
|
|
*p = c;
|
|
if (ttyaction(line, "telnetd", "root"))
|
|
syslog(LOG_ERR, "%s: ttyaction failed", line);
|
|
(void) shutdown(net, 2);
|
|
exit(1);
|
|
}
|