Add support for per-user /tmp.
Enabled via per_user_tmp in /etc/rc.conf (default off). See security(8) and rc.conf(5) for more details. Lots of input from thorpej@ & christos@, thanks!
This commit is contained in:
elad
parent
3044852cc5
commit
5e2e282f9c
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@ -1,4 +1,4 @@
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# $NetBSD: mi,v 1.184 2006/11/12 03:02:50 christos Exp $
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# $NetBSD: mi,v 1.185 2007/02/04 08:19:26 elad Exp $
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#
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# Note: end-user configuration files that are moved to another location
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# should not be marked "obsolete"; they should just be removed from
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@ -206,6 +206,7 @@
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./etc/rc.d/nfslocking etc-nfsserver-rc
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./etc/rc.d/ntpd etc-ntp-rc
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./etc/rc.d/ntpdate etc-ntp-rc
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./etc/rc.d/perusertmp etc-sys-rc
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./etc/rc.d/pf etc-net-rc
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./etc/rc.d/pf_boot etc-net-rc
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./etc/rc.d/pflogd etc-net-rc
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@ -1,4 +1,4 @@
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# $NetBSD: rc.conf,v 1.82 2006/12/30 11:06:04 elad Exp $
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# $NetBSD: rc.conf,v 1.83 2007/02/04 08:19:26 elad Exp $
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#
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# /etc/defaults/rc.conf --
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# default configuration of /etc/rc.conf
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@ -103,6 +103,8 @@ lkm=NO # Run /etc/rc.lkm. /usr needs to be part of /, or
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savecore=YES savecore_flags="-z"
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savecore_dir="/var/crash"
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per_user_tmp=NO # per-user /tmp directories
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per_user_tmp_dir="/private/tmp" # real storage for /tmp
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clear_tmp=YES # clear /tmp after reboot
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update_motd=YES # updates /etc/motd
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dmesg=YES dmesg_flags="" # write /var/run/dmesg.boot
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@ -1,4 +1,4 @@
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# $NetBSD: special,v 1.108 2006/12/14 02:28:30 reed Exp $
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# $NetBSD: special,v 1.109 2007/02/04 08:19:26 elad Exp $
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# @(#)special 8.2 (Berkeley) 1/23/94
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#
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# This file may be overwritten on upgrades.
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@ -222,6 +222,7 @@
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./etc/rc.d/nfslocking type=file mode=0555
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./etc/rc.d/ntpd type=file mode=0555
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./etc/rc.d/ntpdate type=file mode=0555
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./etc/rc.d/perusertmp type=file mode=0555
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./etc/rc.d/pf type=file mode=0555
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./etc/rc.d/pf_boot type=file mode=0555
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./etc/rc.d/pflogd type=file mode=0555
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@ -311,6 +312,9 @@
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./etc/racoon/racoon.conf type=file mode=0644 optional
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./etc/racoon/psk.txt type=file mode=0600 optional tags=nodiff
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./private type=dir mode=0755 optional
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./private/tmp type=dir mode=0111 optional ignore
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./root type=dir mode=0755
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./root/.cshrc type=file mode=0644
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./root/.klogin type=file mode=0600 optional
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@ -1,6 +1,6 @@
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#!/bin/sh
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#
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# $NetBSD: cleartmp,v 1.7 2006/10/07 23:08:03 elad Exp $
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# $NetBSD: cleartmp,v 1.8 2007/02/04 08:19:26 elad Exp $
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#
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# PROVIDE: cleartmp
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@ -16,13 +16,19 @@ stop_cmd=":"
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cleartmp_start()
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{
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echo "Clearing /tmp."
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echo "Clearing temporary files."
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#
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# Prune quickly with one rm, then use find to clean up
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# /tmp/[lq]* (this is not needed with mfs /tmp, but
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# doesn't hurt anything).
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#
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(cd /tmp && rm -rf [a-km-pr-zA-Z]* &&
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if [ \( X"${per_user_tmp}" = X"YES" \) -a \( -d ${per_user_tmp_dir} \) ]; then
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tmp_dir=${per_user_tmp_dir}
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else
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tmp_dir="/tmp"
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fi
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(cd ${tmp_dir} && rm -rf [a-km-pr-zA-Z]* &&
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find -x . ! -name . ! -name lost+found ! -name quota.user \
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! -name quota.group -exec rm -rf -- {} \; -type d -prune)
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}
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@ -0,0 +1,48 @@
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#!/bin/sh
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#
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# $NetBSD: perusertmp,v 1.1 2007/02/04 08:19:26 elad Exp $
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#
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# PROVIDE: perusertmp
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# REQUIRE: mountall
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# BEFORE: cleartmp
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$_rc_subr_loaded . /etc/rc.subr
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name="perusertmp"
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rcvar="per_user_tmp"
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start_cmd="perusertmp_start"
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stop_cmd=":"
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perusertmp_start()
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{
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echo "Preparing per-user /tmp."
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# If /tmp is a mount point, we can't do anything.
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if [ -d "/tmp" ]; then
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local mount_point
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mount_point=$(cd /tmp && /bin/df . | /usr/bin/tail -1 | /usr/bin/awk '{print $6}')
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if [ X"${mount_point}" = X"/tmp" ]; then
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echo "WARNING: /tmp is mounted."
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exit 1
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fi
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fi
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# Enable magic symlinks.
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/sbin/sysctl -qw vfs.generic.magiclinks=1
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# Fixup real temporary directory.
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if [ ! -d ${per_user_tmp_dir} ]; then
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/bin/mkdir ${per_user_tmp_dir}
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fi
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/usr/sbin/chown root:wheel ${per_user_tmp_dir}
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/bin/chmod 0111 ${per_user_tmp_dir}
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# Create magic link for /tmp.
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/bin/rm -rf /tmp
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/bin/ln -s ${per_user_tmp_dir}/@uid /tmp
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}
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load_rc_config $name
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run_rc_command "$1"
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@ -1,4 +1,4 @@
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/* $NetBSD: login_cap.c,v 1.26 2006/12/20 16:47:13 christos Exp $ */
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/* $NetBSD: login_cap.c,v 1.27 2007/02/04 08:19:26 elad Exp $ */
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/*-
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* Copyright (c) 1995,1997 Berkeley Software Design, Inc. All rights reserved.
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@ -36,13 +36,14 @@
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: login_cap.c,v 1.26 2006/12/20 16:47:13 christos Exp $");
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__RCSID("$NetBSD: login_cap.c,v 1.27 2007/02/04 08:19:26 elad Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/param.h>
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#include <assert.h>
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#include <ctype.h>
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@ -557,6 +558,7 @@ setclasscontext(const char *class, u_int flags)
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int
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setusercontext(login_cap_t *lc, struct passwd *pwd, uid_t uid, u_int flags)
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{
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char per_user_tmp[MAXPATHLEN + 1];
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login_cap_t *flc;
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quad_t p;
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int i;
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@ -606,6 +608,33 @@ setusercontext(login_cap_t *lc, struct passwd *pwd, uid_t uid, u_int flags)
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}
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}
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/* Create per-user temporary directories if needed. */
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if (readlink("/tmp", per_user_tmp, sizeof(per_user_tmp)) != -1) {
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static const char atuid[] = "/@uid";
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char *lp;
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/* Check if it's magic symlink. */
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lp = strstr(per_user_tmp, atuid);
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if (lp != NULL && *(lp + (sizeof(atuid) - 1)) == '\0') {
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lp++;
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if ((sizeof(per_user_tmp) - (lp - per_user_tmp)) < 64) {
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syslog(LOG_ERR, "real temporary path too long");
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login_close(flc);
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return (-1);
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}
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(void)sprintf(lp, "/%u", pwd->pw_uid); /* safe */
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if (mkdir(per_user_tmp, S_IRWXU) != -1) {
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(void)chown(per_user_tmp, pwd->pw_uid,
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pwd->pw_gid);
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} else {
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syslog(LOG_ERR, "can't create `%s' directory",
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per_user_tmp);
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}
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}
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}
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errno = 0;
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if (flags & LOGIN_SETLOGIN)
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if (setlogin(pwd->pw_name) < 0) {
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syslog(LOG_ERR, "setlogin(%s) failure: %m",
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@ -1,5 +1,5 @@
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# $NetBSD: shlib_version,v 1.42 2006/12/14 20:09:36 he Exp $
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# $NetBSD: shlib_version,v 1.43 2007/02/04 08:19:26 elad Exp $
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# Remember to update distrib/sets/lists/base/shl.* when changing
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#
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major=7
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minor=12
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minor=13
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@ -1,4 +1,4 @@
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.\" $NetBSD: rc.conf.5,v 1.111 2006/12/23 09:12:35 wiz Exp $
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.\" $NetBSD: rc.conf.5,v 1.112 2007/02/04 08:19:26 elad Exp $
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.\"
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.\" Copyright (c) 1996 Matthew R. Green
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.\" Copyright (c) 1997 Curt J. Sampson
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@ -32,7 +32,7 @@
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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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.Dd December 4, 2006
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.Dd February 4, 2007
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.Dt RC.CONF 5
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.Os
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.Sh NAME
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@ -313,6 +313,18 @@ to trim logfiles before syslogd starts.
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Intended for laptop users.
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Passes
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.Sy newsyslog_flags .
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.It Sy per_user_tmp
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.Sq YES
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or
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.Sq NO .
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Enables a per-user
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.Pa /tmp
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directory.
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.Sy per_user_tmp_dir
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can be used to override the default location of the
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.Dq real
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temporary directories,
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.Dq Pa /private/tmp .
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.It Sy savecore
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.Sq YES
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or
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@ -1,4 +1,4 @@
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.\" $NetBSD: security.8,v 1.13 2007/02/02 02:42:00 elad Exp $
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.\" $NetBSD: security.8,v 1.14 2007/02/04 08:19:26 elad Exp $
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.\"
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.\" Copyright (c) 2006 Elad Efrat <elad@NetBSD.org>
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.\" All rights reserved.
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@ -25,7 +25,7 @@
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd February 2, 2007
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.Dd February 4, 2007
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.Dt SECURITY 8
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.Os
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.Sh NAME
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@ -46,6 +46,10 @@ Veriexec (file integrity)
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.It
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Exploit mitigation
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.It
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Per-user
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.Pa /tmp
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directory
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.It
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Information filtering
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.El
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.Sh VERIEXEC
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@ -297,6 +301,34 @@ Use of
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is especially encouraged on platforms without per-page execute bit granularity
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such as
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.Em i386 .
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.Sh PER-USER TEMPORARY STORAGE
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It is possible to configure per-user temporary storage to avoid potential
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security issues (race conditions, etc.) in programs that do not make secure
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usage of
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.Pa /tmp .
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.Pp
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To enable per-user temporary storage, add the following line to
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.Xr rc.conf 5 :
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.Bd -literal -offset indent
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per_user_tmp=YES
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.Ed
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.Pp
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If
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.Pa /tmp
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is a mount point, you will also need to update its
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.Xr fstab 5
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entry to use
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.Dq /private/tmp
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(or whatever directory you want, if you override the default using the
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.Dq per_user_tmp_dir
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.Xr rc.conf 5
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keyword) instead of
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.Dq /tmp .
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.Pp
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Following that, run:
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.Bd -literal -offset indent
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# /etc/rc.d/perusertmp start
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.Ed
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.Sh INFORMATION FILTERING
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.Nx
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provides administrators the ability to restrict information passed from
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