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If su(1) is run without an effective uid of 0, generate an error to

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the user indicating that su is not running setuid, which may help
suggest to the user that it should be setuid, or should not be
running from a file system mounted nosuid.

Suggsted by:	Ivan Voras <ivoras at fer dot hr>
MFC after:	2 weeks
This commit is contained in:
Robert Watson 2005-01-17 19:57:59 +00:00
parent 02f8f932bc
commit c8fbd1ec9b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=140392
1 changed files with 33 additions and 3 deletions
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36
usr.bin/su/su.c
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@ -1,7 +1,5 @@
/*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 2002 Networks Associates Technologies, Inc.
* Copyright (c) 2002, 2005 Networks Associates Technologies, Inc.
* All rights reserved.
*
* Portions of this software were developed for the FreeBSD Project by
@ -17,6 +15,31 @@
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
/*-
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
@ -184,6 +207,13 @@ main(int argc, char *argv[])
if (strlen(user) > MAXLOGNAME - 1)
errx(1, "username too long");
/*
* Try to provide more helpful debugging output if su(1) is running
* non-setuid, or was run from a file system not mounted setuid.
*/
if (geteuid() != 0)
errx(1, "not running setuid");
nargv = malloc(sizeof(char *) * (size_t)(argc + 4));
if (nargv == NULL)
errx(1, "malloc failure");