c7302b61ef
Files with no license use the default 3-clauses BSD license. The copyright were mostly not recorded; they were updated according to the Changelog. "Julianne Frances Haugh and contributors" changed to "copyright holders and contributors".
130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
/*
|
|
* Copyright (c) 1989 - 1994, Julianne Frances Haugh
|
|
* Copyright (c) 1996 - 2001, Marek Michałkiewicz
|
|
* Copyright (c) 2003 - 2005, Tomasz Kłoczko
|
|
* Copyright (c) 2007 , Nicolas François
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the copyright holders or contributors may not be used to
|
|
* endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
|
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#ident "$Id$"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <grp.h>
|
|
#include "prototypes.h"
|
|
#include "defines.h"
|
|
#include <pwd.h>
|
|
#include "getdef.h"
|
|
/*
|
|
* is_my_tty -- determine if "tty" is the same as TTY stdin is using
|
|
*/
|
|
static int is_my_tty (const char *tty)
|
|
{
|
|
struct stat by_name, by_fd;
|
|
|
|
if (stat (tty, &by_name) || fstat (0, &by_fd))
|
|
return 0;
|
|
|
|
if (by_name.st_rdev != by_fd.st_rdev)
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* chown_tty() sets the login tty to be owned by the new user ID
|
|
* with TTYPERM modes
|
|
*/
|
|
|
|
void chown_tty (const char *tty, const struct passwd *info)
|
|
{
|
|
char buf[200], full_tty[200];
|
|
char *group; /* TTY group name or number */
|
|
struct group *grent;
|
|
gid_t gid;
|
|
|
|
/*
|
|
* See if login.defs has some value configured for the port group
|
|
* ID. Otherwise, use the user's primary group ID.
|
|
*/
|
|
|
|
if (!(group = getdef_str ("TTYGROUP")))
|
|
gid = info->pw_gid;
|
|
else if (group[0] >= '0' && group[0] <= '9')
|
|
gid = atoi (group);
|
|
else if ((grent = getgrnam (group))) /* local, no need for xgetgrnam */
|
|
gid = grent->gr_gid;
|
|
else
|
|
gid = info->pw_gid;
|
|
|
|
/*
|
|
* Change the permissions on the TTY to be owned by the user with
|
|
* the group as determined above.
|
|
*/
|
|
|
|
if (*tty != '/') {
|
|
snprintf (full_tty, sizeof full_tty, "/dev/%s", tty);
|
|
tty = full_tty;
|
|
}
|
|
|
|
if (!is_my_tty (tty)) {
|
|
SYSLOG ((LOG_WARN,
|
|
"unable to determine TTY name, got %s\n", tty));
|
|
closelog ();
|
|
exit (1);
|
|
}
|
|
|
|
if (chown (tty, info->pw_uid, gid) ||
|
|
chmod (tty, getdef_num ("TTYPERM", 0600))) {
|
|
int err = errno;
|
|
|
|
snprintf (buf, sizeof buf, _("Unable to change tty %s"), tty);
|
|
perror (buf);
|
|
SYSLOG ((LOG_WARN,
|
|
"unable to change tty `%s' for user `%s'\n", tty,
|
|
info->pw_name));
|
|
closelog ();
|
|
|
|
if (err != EROFS)
|
|
exit (1);
|
|
}
|
|
#ifdef __linux__
|
|
/*
|
|
* Please don't add code to chown /dev/vcs* to the user logging in -
|
|
* it's a potential security hole. I wouldn't like the previous user
|
|
* to hold the file descriptor open and watch my screen. We don't
|
|
* have the *BSD revoke() system call yet, and vhangup() only works
|
|
* for tty devices (which vcs* is not). --marekm
|
|
*/
|
|
#endif
|
|
}
|
|
|