Reimplement nologin(8) as a C program. This allows us to statically
link it at low cost and avoid environment poisoning attacks associated with LD_LIBRARY_PATH. Suggested by: rwatson
This commit is contained in:
David Schultz
parent
0bfbe7b935
commit
71ff2d08cd
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=122842
@ -1,7 +1,14 @@
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# @(#)Makefile 8.2 (Berkeley) 4/22/94
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# $FreeBSD$
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SCRIPTS=nologin.sh
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PROG= nologin
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MAN= nologin.5 nologin.8
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# It is important that nologin be statically linked for security
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# reasons. A dynamic non-setuid binary can be linked against a trojan
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# libc by setting LD_LIBRARY_PATH appropriately. Both sshd(8) and
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# login(1) make it possible to log in with an unsanitized environment,
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# rendering a dynamic nologin binary virtually useless.
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NOSHARED= YES
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.include <bsd.prog.mk>
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21
sbin/nologin/nologin.c
Normal file
21
sbin/nologin/nologin.c
Normal file
@ -0,0 +1,21 @@
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/*-
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* This program is in the public domain. I couldn't bring myself to
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* declare Copyright on a variant of Hello World.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#define MESSAGE "This account is currently not available.\n"
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int
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main(int argc, char *argv[])
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{
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write(STDOUT_FILENO, MESSAGE, sizeof(MESSAGE));
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_exit(1);
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}
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@ -1,39 +0,0 @@
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#!/bin/sh -p
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#
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# Copyright (c) 1992, 1993
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# The Regents of the University of California. 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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# 3. All advertising materials mentioning features or use of this software
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# must display the following acknowledgement:
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# This product includes software developed by the University of
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# California, Berkeley and its contributors.
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# 4. Neither the name of the University 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 THE REGENTS 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 THE REGENTS 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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# @(#)nologin.sh 8.1 (Berkeley) 6/5/93
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# $FreeBSD$
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#
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echo 'This account is currently not available.'
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exit 1
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@ -1,7 +1,14 @@
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# @(#)Makefile 8.2 (Berkeley) 4/22/94
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# $FreeBSD$
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SCRIPTS=nologin.sh
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PROG= nologin
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MAN= nologin.5 nologin.8
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# It is important that nologin be statically linked for security
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# reasons. A dynamic non-setuid binary can be linked against a trojan
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# libc by setting LD_LIBRARY_PATH appropriately. Both sshd(8) and
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# login(1) make it possible to log in with an unsanitized environment,
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# rendering a dynamic nologin binary virtually useless.
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NOSHARED= YES
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.include <bsd.prog.mk>
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21
usr.sbin/nologin/nologin.c
Normal file
21
usr.sbin/nologin/nologin.c
Normal file
@ -0,0 +1,21 @@
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/*-
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* This program is in the public domain. I couldn't bring myself to
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* declare Copyright on a variant of Hello World.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#define MESSAGE "This account is currently not available.\n"
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int
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main(int argc, char *argv[])
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{
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write(STDOUT_FILENO, MESSAGE, sizeof(MESSAGE));
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_exit(1);
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}
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@ -1,39 +0,0 @@
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#!/bin/sh -p
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#
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# Copyright (c) 1992, 1993
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# The Regents of the University of California. 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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# 3. All advertising materials mentioning features or use of this software
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# must display the following acknowledgement:
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# This product includes software developed by the University of
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# California, Berkeley and its contributors.
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# 4. Neither the name of the University 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 THE REGENTS 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 THE REGENTS 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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# @(#)nologin.sh 8.1 (Berkeley) 6/5/93
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# $FreeBSD$
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#
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echo 'This account is currently not available.'
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exit 1
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