#!/bin/bash
# fixfiles
#
# Script to restore labels on a SELinux box
#
# Copyright (C) 2004 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

#
# Set global Variables
#
fullFlag=0
FORCEFLAG=""
DIRS=""
RPMILES=""
OUTFILES=""
LOGFILE=`tty`
SYSLOGFLAG="-l"
LOGGER=/usr/sbin/logger
SETFILES=/sbin/setfiles
RESTORECON=/sbin/restorecon
FILESYSTEMSRW=`mount | grep -v "context=" | egrep -v '\((|.*,)bind(,.*|)\)' | awk '/(ext[23]| xfs | jfs ).*\(rw/{print $3}';`
FILESYSTEMSRO=`mount | grep -v "context=" | egrep -v '\((|.*,)bind(,.*|)\)' | awk '/(ext[23]| xfs | jfs ).*\(ro/{print $3}';`
FILESYSTEMS="$FILESYSTEMSRW $FILESYSTEMSRO"
SELINUXTYPE="targeted"
if [ -e /etc/selinux/config ]; then
    . /etc/selinux/config
    FC=/etc/selinux/${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 's,\*$,,g' >> ${TEMPFILE};;  
                  esac; \
               fi; \
            done | \
	while read pattern ; do find $pattern \
		      ! \( -fstype ext2 -o -fstype ext3 -o -fstype jfs -o -fstype xfs \) -prune  -o \
		      \( -wholename /home -o -wholename /root -o -wholename /tmp -wholename /dev \) -prune -o -print; \
		      done 2> /dev/null | \
	 ${RESTORECON} $2 -v -f - 
	rm -f ${TEMPFILE} ${PREFCTEMPFILE}
fi
}
#
# Log all Read Only file systems 
#
LogReadOnly() {
if [ ! -z "$FILESYSTEMSRO" ]; then
    logit "Warning: Skipping the following R/O filesystems:"
    logit "$FILESYSTEMSRO"
fi
}

rpmlist() {
rpm -q --qf '[%{FILESTATES} %{FILENAMES}\n]' "$1" | grep '^0 ' | cut -f2- -d ' '
}

# 
# restore
# if called with -n will only check file context
#
restore () {
if [ ! -z "$PREFC" ]; then
    diff_filecontext $1
    exit $?
fi
if [ ! -z "$RPMFILES" ]; then
    for i in `echo "$RPMFILES" | sed 's/,/ /g'`; do
	rpmlist $i | ${RESTORECON} ${OUTFILES} ${FORCEFLAG} $* -i -f - 2>&1 >> $LOGFILE
    done
    exit $?
fi
if [ ! -z "$DIRS" ]; then
    if [ -x /usr/bin/find ]; then
	for d in ${DIRS} ; do find $d \
	    ! \( -fstype ext2 -o -fstype ext3 -o -fstype jfs -o -fstype xfs \) -prune  -o -print | \
	    ${RESTORECON} ${OUTFILES} ${FORCEFLAG} $* -f - 2>&1 >> $LOGFILE
	done
    else
	${RESTORECON} ${OUTFILES} ${FORCEFLAG} -R $* $DIRS 2>&1 >> $LOGFILE
    fi

    exit $?
fi
LogReadOnly
if [  -n "${FILESYSTEMSRW}" ]; then
    ${SETFILES} ${OUTFILES} ${SYSLOGFLAG} ${FORCEFLAG} $* ${FC} ${FILESYSTEMSRW} 2>&1 >> $LOGFILE
else
    echo >&2 "fixfiles: No suitable file systems found"
fi
exit $?
}

fullrelabel() {
    logit "Cleaning out /tmp"
    rm -rf /tmp/.??* /tmp/*
    LogReadOnly
    restore
}

relabel() {
    if [ ! -z "$RPMFILES" ]; then
	restore 
    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
    fi
}

usage() {
      	echo $"Usage: $0 [-l logfile ] [-o outputfile ] { check | restore|[-F] relabel } [[dir] ... ] "
	echo or
      	echo $"Usage: $0 -R rpmpackage[,rpmpackage...] -C PREVIOUS_FILECONTEXT [-l logfile ] [-o outputfile ] { check | restore }"
}

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

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


# Check for the command
eval command=\$${OPTIND}
let OPTIND=$OPTIND+1
if [ -z $command ]; then
    usage
fi

#
# check if they specified both DIRS and RPMFILES
#

if [ ! -z "$RPMFILES" ]; then
    if [ $OPTIND -le $# ]; then
	    usage
    fi
else
    while [ $OPTIND -le $# ]; do
	eval DIR=\$${OPTIND}
	DIRS="$DIRS $DIR"
	let OPTIND=$OPTIND+1
    done
fi
#
# Make sure they specified one of the three valid commands
#
case "$command" in
    restore) restore -p ;;
    check) restore -n -v ;;
    verify) restore -n -o -;;
    relabel) relabel;;
    *)
    usage
    exit 1
esac