126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/*
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* Copyright 1989 - 1994, Julianne Frances Haugh
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* 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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* 4. Neither the name of Julianne F. Haugh 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 JULIE HAUGH 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 JULIE HAUGH 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 <config.h>
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#include "rcsid.h"
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RCSID ("$Id: chowntty.c,v 1.11 2005/03/31 05:14:50 kloczek Exp $")
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <errno.h>
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#include <grp.h>
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#include "prototypes.h"
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#include "defines.h"
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#include <pwd.h>
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#include "getdef.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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static 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_WARN,
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"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) ||
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chmod (tty, getdef_num ("TTYPERM", 0600))) {
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int err = errno;
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snprintf (buf, sizeof buf, _("Unable to change tty %s"), tty);
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perror (buf);
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SYSLOG ((LOG_WARN,
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"unable to change tty `%s' for user `%s'\n", tty,
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info->pw_name));
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closelog ();
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if (!(err == EROFS && info->pw_uid == 0))
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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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