110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/* uudir.c
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Create a directory owned by uucp. This is Unix specific.
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Copyright (C) 1992 Ian Lance Taylor
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This file is part of the Taylor UUCP package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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The author of the program may be contacted at ian@airs.com or
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c/o AIRS, P.O. Box 520, Waltham, MA 02254.
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$Log: uudir.c,v $
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Revision 1.1.1.1 1993/03/21 09:45:37 cgd
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initial import of 386bsd-0.1 sources
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Revision 1.1 1992/02/09 05:11:42 ian
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Initial revision
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*/
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#include "uucp.h"
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#if USE_RCS_ID
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char uudir_rcsid[] = "$Id: uudir.c,v 1.1.1.1 1993/03/21 09:45:37 cgd Exp $";
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#endif
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#include <pwd.h>
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#if USE_STDIO && HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "sysdep.h"
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/* External functions. */
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extern int setuid ();
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extern struct passwd *getpwnam ();
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/* This is a simple program which sets its real uid to uucp and then
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invokes /bin/mkdir. It is only used if the system does not support
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the mkdir system call. It must be installed suid to root.
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This program is needed because the UUCP programs will be run suid
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to uucp. On a system without the mkdir system call, /bin/mkdir is
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a suid root program. This means that /bin/mkdir always creates
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directories using the real uid, rather than the effective uid.
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This is wrong, since the UUCP programs always want to create
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directories that are owned by uucp. Therefore, this simple suid
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root program is used to force /bin/mkdir into making a directory
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owned by uucp.
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If we made the program publically executable, this would mean that
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anybody could create a directory owned by uucp. This is probably
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not a good thing, but since the program must be owned by root we
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can't simply make it executable only by uucp. Therefore, the
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Makefile hides the program away in /usr/lib/uucp/util, and makes
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that directory searchable only by uucp. This should prevent
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anybody else from getting to the program.
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This is not a perfect solution, since any suid root program is by
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definition a potential security hole. I really can't see any way
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to avoid this, though. */
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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struct passwd *q;
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const char *zprog, *zname;
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/* We don't print any error messages, since this program should
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never be run directly by a user. */
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if (argc != 2)
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exit (EXIT_FAILURE);
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/* OWNER is passed in from the Makefile. It will normally be
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"uucp". */
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q = getpwnam (OWNER);
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if (q == NULL)
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exit (EXIT_FAILURE);
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if (setuid (q->pw_uid) < 0)
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exit (EXIT_FAILURE);
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zprog = MKDIR_PROGRAM;
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zname = strrchr (zprog, '/');
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if (zname == NULL)
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zname = zprog;
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else
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++zname;
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(void) execl (zprog, zname, argv[1], (char *) NULL);
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exit (EXIT_FAILURE);
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}
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