124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/*****************************************************************************
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*
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* $Id: chowntty.c,v 1.2 2003/08/15 20:05:36 mbroek Exp $
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* Purpose ...............: MBSE BBS Shadow Password Suite
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* Original Source .......: Shadow Password Suite
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* Original Copyright ....: Julianne Frances Haugh and others.
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*
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*****************************************************************************
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* Copyright (C) 1997-2001
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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#include "../config.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <syslog.h>
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#include <stdio.h>
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#include <grp.h>
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#include "mblogin.h"
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#include <pwd.h>
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#include "getdef.h"
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#include "chowntty.h"
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/*
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* is_my_tty -- determine if "tty" is the same as TTY stdin is using
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*/
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int is_my_tty(const char *tty)
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{
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struct stat by_name, by_fd;
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if (stat (tty, &by_name) || fstat (0, &by_fd))
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return 0;
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if (by_name.st_rdev != by_fd.st_rdev)
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return 0;
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else
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return 1;
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}
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/*
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* chown_tty() sets the login tty to be owned by the new user ID
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* with TTYPERM modes
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*/
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void chown_tty(const char *tty, const struct passwd *info)
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{
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char buf[200], full_tty[200];
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char *group; /* TTY group name or number */
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struct group *grent;
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gid_t gid;
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/*
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* * See if login.defs has some value configured for the port group
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* * ID. Otherwise, use the user's primary group ID.
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* */
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if (! (group = getdef_str ("TTYGROUP")))
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gid = info->pw_gid;
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else if (group[0] >= '0' && group[0] <= '9')
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gid = atoi (group);
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else if ((grent = getgrnam (group)))
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gid = grent->gr_gid;
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else
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gid = info->pw_gid;
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/*
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* Change the permissions on the TTY to be owned by the user with
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* the group as determined above.
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*/
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if (*tty != '/') {
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snprintf(full_tty, sizeof full_tty, "/dev/%s", tty);
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tty = full_tty;
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}
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if (! is_my_tty (tty)) {
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syslog(LOG_WARNING, "unable to determine TTY name, got %s\n", tty);
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closelog();
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exit (1);
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}
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if (chown(tty, info->pw_uid, gid) || chmod(tty, 0600)) {
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snprintf(buf, sizeof buf, "Unable to change tty %s", tty);
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syslog(LOG_WARNING, "unable to change tty `%s' for user `%s'\n", tty, info->pw_name);
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closelog();
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perror (buf);
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exit(1);
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}
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#ifdef __linux__
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/*
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* Please don't add code to chown /dev/vcs* to the user logging in -
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* it's a potential security hole. I wouldn't like the previous user
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* to hold the file descriptor open and watch my screen. We don't
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* have the *BSD revoke() system call yet, and vhangup() only works
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* for tty devices (which vcs* is not). --marekm
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*/
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#endif
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}
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