shadow/libmisc/sub.c

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/*
* Copyright 1989 - 1991, Julianne Frances Haugh
* 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. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH 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 JULIE HAUGH 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>
#include "rcsid.h"
RCSID("$Id: sub.c,v 1.6 1999/03/07 19:14:43 marekm Exp $")
#include <sys/types.h>
#include "prototypes.h"
#include "defines.h"
#include <pwd.h>
#define BAD_SUBROOT2 "invalid root `%s' for user `%s'\n"
#define NO_SUBROOT2 "no subsystem root `%s' for user `%s'\n"
/*
* subsystem - change to subsystem root
*
* A subsystem login is indicated by the presense of a "*" as
* the first character of the login shell. The given home
* directory will be used as the root of a new filesystem which
* the user is actually logged into.
*/
void
subsystem(const struct passwd *pw)
{
/*
* The new root directory must begin with a "/" character.
*/
if (pw->pw_dir[0] != '/') {
printf(_("Invalid root directory \"%s\"\n"), pw->pw_dir);
SYSLOG((LOG_WARN, BAD_SUBROOT2, pw->pw_dir, pw->pw_name));
closelog();
exit (1);
}
/*
* The directory must be accessible and the current process
* must be able to change into it.
*/
if (chdir (pw->pw_dir) || chroot (pw->pw_dir)) {
printf(_("Can't change root directory to \"%s\"\n"), pw->pw_dir);
SYSLOG((LOG_WARN, NO_SUBROOT2, pw->pw_dir, pw->pw_name));
closelog();
exit (1);
}
}