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#!/bin/bash
# fixfiles
#
# Script to restore labels on a SELinux box
#
# Copyright (C) 2004-2009 Red Hat, Inc.
# Authors: Dan Walsh <dwalsh@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#
# Get all mounted rw file systems that support seclabel
#
get_labeled_mounts() {
# /dev is not listed in the mountab
FS="`mount | egrep -v '\((|.*,)bind(,.*|)\)' | awk '/\(rw/{print $3}';` /dev"
for i in $FS; do 
    grep --silent "$i ".*seclabel /proc/self/mounts && echo $i
done
}

exclude_dirs_from_relabelling() {
    exclude_from_relabelling=
    if [ -e /etc/selinux/fixfiles_exclude_dirs ]
    then
    while read i
    do
        # skip blank line and comment
        # skip not absolute path
        # skip not directory
        [ -z "${i}" ] && continue
        [[ "${i}" =~ "^[[:blank:]]*#" ]] && continue
        [[ ! "${i}" =~ ^/.* ]] && continue
        [[ ! -d "${i}" ]] && continue
        exclude_from_relabelling="$exclude_from_relabelling -e $i"
        logit "skipping the directory $i from relabelling"
    done < /etc/selinux/fixfiles_exclude_dirs
    fi
    echo "$exclude_from_relabelling"
}

exclude_dirs() {
    exclude=
    for i in /sys /proc /dev /run /mnt /var/tmp /var/lib/BackupPC /home /tmp /dev; do
    [ -e $i ]  && exclude="$exclude -e $i";
    done
    exclude="$exclude `exclude_dirs_from_relabelling`"
    echo "$exclude"
}

#
# Set global Variables
#
fullFlag=0
FORCEFLAG=""
DIRS=""
RPMILES=""
LOGFILE=`tty`
if [ $? != 0 ]; then
    LOGFILE="/dev/null"
fi
SYSLOGFLAG="-l"
LOGGER=/usr/sbin/logger
SETFILES=/sbin/setfiles
RESTORECON=/sbin/restorecon
FILESYSTEMS=`get_labeled_mounts`
SELINUXTYPE="targeted"
if [ -e /etc/selinux/config ]; then
    . /etc/selinux/config
    FC=/etc/selinux/${SELINUXTYPE}/contexts/files/file_contexts 
else
    FC=/etc/security/selinux/file_contexts
fi

#
# Log to either syslog or a LOGFILE
#
logit () {
if [ -n $LOGFILE ]; then
    echo $1 >> $LOGFILE
fi
}
#
# Compare PREVious File Context to currently installed File Context and 
# run restorecon on all files affected by the differences.
#
diff_filecontext() {
if [ -f ${PREFC} -a -x /usr/bin/diff ]; then
	TEMPFILE=`mktemp ${FC}.XXXXXXXXXX`
	test -z "$TEMPFILE" && exit
	PREFCTEMPFILE=`mktemp ${PREFC}.XXXXXXXXXX`
	sed -r -e 's,:s0, ,g' $PREFC | sort -u > ${PREFCTEMPFILE}
	sed -r -e 's,:s0, ,g' $FC | sort -u | \
	/usr/bin/diff -b ${PREFCTEMPFILE} - | \
	    grep '^[<>]'|cut -c3-| grep ^/ | \
	    egrep -v '(^/home|^/root|^/tmp|^/dev)' |\
	sed -r -e 's,[[:blank:]].*,,g' \
               -e 's|\(([/[:alnum:]]+)\)\?|{\1,}|g' \
	       -e 's|([/[:alnum:]])\?|{\1,}|g' \
               -e 's|\?.*|*|g' \
	       -e 's|\(.*|*|g' \
	       -e 's|\[.*|*|g' \
               -e 's|\.\*.*|*|g' \
               -e 's|\.\+.*|*|g' | \
	    # These two sorts need to be separate commands \
	sort -u | \
	sort -d | \
        while read pattern ; \
	    do if ! echo "$pattern" | grep -q -f ${TEMPFILE} 2>/dev/null; then \
                  echo "$pattern"; \
                  case "$pattern" in *"*") \
	               echo "$pattern" | sed -e 's,^,^,' -e 's,\*$,,g' >> ${TEMPFILE};;  
                  esac; \
               fi; \
            done | \
		      ${RESTORECON} -i -f - -R -p  `exclude_dirs`; \
	rm -f ${TEMPFILE} ${PREFCTEMPFILE}
fi
}

rpmlist() {
rpm -q --qf '[%{FILESTATES} %{FILENAMES}\n]' "$1" | grep '^0 ' | cut -f2- -d ' '
[ ${PIPESTATUS[0]} != 0 ] && echo "$1 not found" >/dev/stderr
}

# 
# restore
# if called with -n will only check file context
#
restore () {

if ! selinuxenabled; then
       echo $"SELinux is disabled."
       exit 1
fi

OPTION=$1
shift

if [ ! -z "$PREFC" ]; then
    diff_filecontext $*
    exit $?
fi
if [ ! -z "$RPMFILES" ]; then
    for i in `echo "$RPMFILES" | sed 's/,/ /g'`; do
	rpmlist $i | ${RESTORECON} ${FORCEFLAG} $* -R -i -f - 2>&1 | cat >> $LOGFILE
    done
    exit $?
fi
if [ ! -z "$FILEPATH" ]; then
    ${RESTORECON} ${FORCEFLAG} -R $* $FILEPATH 2>&1 | cat >> $LOGFILE
    return
fi
[ -x /usr/sbin/genhomedircon ] && /usr/sbin/genhomedircon
#
exclude_dirs="`exclude_dirs_from_relabelling`"
if [ -n "${exclude_dirs}" ]
then
    TEMPFCFILE=`mktemp ${FC}.XXXXXXXXXX`
    TEMPFCBACKUP=`mktemp ${FC}.XXXXXXXXXX.backup`
    test -z "$TEMPFCFILE" && exit
    /bin/cp -p ${FC} ${TEMPFCFILE} &>/dev/null || exit
    /bin/cp -p ${FC} ${TEMPFCBACKUP} &>/dev/null || exit
    tmpdirs=${tempdirs//-e/}
    for p in ${tmpdirs}
    do
        p="${p%/}"
        p1="${p}(/.*)? -- <<none>>"
        echo "${p1}" >> $TEMPFCFILE
        logit "skipping the directory ${p} from relabelling"
    done
/bin/cp $TEMPFCFILE $FC &>/dev/null || exit
fi
${SETFILES} $exclude_dirs -q ${SYSLOGFLAG} ${FORCEFLAG} $* ${FC} ${FILESYSTEMS} 2>&1 | cat >> $LOGFILE
if [ ${OPTION} != "Relabel" ]; then
    return
fi
if [ -n "${exclude_dirs}" ];then
    /bin/cp -p ${TEMPFCBACKUP} ${FC} &>/dev/null || exit
    rm -rf ${TEMPFCBACKUP}
fi
rm -rf /tmp/gconfd-* /tmp/pulse-* /tmp/orbit-* $TEMPFCFILE
find /tmp \( -context "*:file_t*" -o -context "*:unlabeled_t*" \) -exec chcon -t tmp_t {} \;
find /var/tmp \( -context "*:file_t*" -o -context "*:unlabeled_t*" \) -exec chcon -t tmp_t {} \;
exit 0
}

fullrelabel() {
    logit "Cleaning out /tmp"
    find /tmp/ -mindepth 1 -delete
    restore Relabel
}

relabel() {
    if ! selinuxenabled; then
        echo $"SELinux is disabled."
        exit 1
    fi

    if [ ! -z "$RPMFILES" ]; then
	restore Relabel
    fi

    if [ $fullFlag == 1  ]; then
	fullrelabel
    fi

    echo -n "
    Files in the /tmp directory may be labeled incorrectly, this command 
    can remove all files in /tmp.  If you choose to remove files from /tmp, 
    a reboot will be required after completion.
    
    Do you wish to clean out the /tmp directory [N]? "
    read answer
    if [ "$answer" = y -o  "$answer" = Y ]; then 
	fullrelabel
    else
	restore Relabel
    fi
}

process() {
#
# Make sure they specified one of the three valid commands
#
case "$1" in
    restore) restore Relabel -p ;;
    check) restore Check -n -v;;
    verify) restore Verify -n -o -;;
    relabel) relabel;;
    onboot)
	touch /.autorelabel
	echo "System will relabel on next boot"
	;;
    *)
    usage
    exit 1
esac
}
usage() {
      	echo $"""
Usage: $0 [-F] [-l logfile ] { check | restore| [-f] relabel | verify } [[dir/file] ... ] 
or
Usage: $0 [-F] -R rpmpackage[,rpmpackage...] [-l logfile ] { check | restore | verify }
or
Usage: $0 [-F] -C PREVIOUS_FILECONTEXT { check | restore | verify }
or
Usage: $0 onboot
"""
}

if [ $# = 0 ]; then
	usage
	exit 1
fi

# See how we were called.
while getopts "C:FfR:l:" i; do
    case "$i" in
	f)
		fullFlag=1
		;;
        R)
		RPMFILES=$OPTARG
		;;
        l)
		LOGFILE=$OPTARG
		;;
        C)
		PREFC=$OPTARG
		;;
	F)
		FORCEFLAG="-F"
		;;
	*)
	    usage
	    exit 1
esac
done

# Move out processed options from arguments
shift $(( OPTIND - 1 ))

# Check for the command
command=$1
if [ -z $command ]; then
    usage
fi

# Move out command from arguments
shift

#
# check if they specified both DIRS and RPMFILES
#

if [ ! -z "$RPMFILES" ]; then
    process $command
    if [ $# -gt 0 ]; then
	    usage
    fi
else
    if [ -z "$1" ]; then
	process $command
    else
	while [ -n "$1" ]; do 
	    FILEPATH=$1
	    process $command 
	    shift
    	done
    fi
fi
exit $?
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