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| #!/bin/bash
# init
execName=$(basename $0)
tmpDir=$(mktemp -d /tmp/$execName.XXXXXX)
tmpFile=$tmpDir/$execName
# manage arguments
if [[ $# != 1 ]]
then
echo "Usage: $execName <Type_Enforcement_file>"
exit 1
fi
dstDir=$(dirname $1)
dstFile=$(basename $1)
dstFile=${dstFile%.te}
if [[ ! -s $1 ]]
then
echo "WARNING: <Type_Enforcement_file> non-existent or empty, creating it..."
touch $1
fi
cp $1 $tmpFile.te.src
# create new type enforcement file from audit file
audit2allow -m local -l -i /var/log/audit/audit.log > $tmpFile.te.add
# set header file
echo "
module local 1.0;
require {" > $tmpFile.te.new
# format and merge type lines
awk '
/^[[:space:]]*type / \
{
sub("^[[:space:]]*", " ")
print
}' $tmpFile.te.src > $tmpFile.type.src
awk '
/^[[:space:]]*type / \
{
sub("^[[:space:]]*", " ")
print
}' $tmpFile.te.add > $tmpFile.type.add
sort -u -k 2,2 $tmpFile.type.src $tmpFile.type.add >> $tmpFile.te.new
# format and merge class lines
awk '
/^[[:space:]]*class / \
{
sub("^[[:space:]]*", " ")
if ($0 !~ "[{}]")
{
$2=$2 " {"
if (length($NF) == 1) $NF="}" $NF
else sub(".$", " };", $NF)
}
print
}' $tmpFile.te.src | sort -k 3,3 > $tmpFile.class.src
awk '
/^[[:space:]]*class / \
{
sub("^[[:space:]]*", " ")
if ($0 !~ "[{}]")
{
$2=$2 " {"
if (length($NF) == 1) {$NF="}" $NF}
else {sub(".$", " };", $NF)}
}
print
}' $tmpFile.te.add | sort -k 3,3 > $tmpFile.class.add
[[ ! -s $tmpFile.class.src ]] && cp $tmpFile.class.add $tmpFile.class.src
while read srcLine
do
options=$(echo "$srcLine" | awk '
BEGIN {OFS="\n"}
{
for (i=4; i<NF; i++) {print $i}
}')
className=$(echo "$srcLine" | awk '{print $2}')
addOptions=$(awk -v c=$className '
BEGIN {OFS="\n"}
$2 == c \
{
for (i=4; i<NF; i++) {print $i}
}' $tmpFile.class.add)
[[ -n $addOptions ]] && options+=$'\n'$addOptions
line=" class $className { $(echo "$options" | sort -u | tr "\n" " ")};"
echo "$line" >> $tmpFile.te.new
done < $tmpFile.class.src
# close require block
echo "}" >> $tmpFile.te.new
# sort rules and format options
awk '
/^allow / \
{
if ($4 !~ "^{")
{
$4="{ " $4
sub(".$", " };", $NF)
}
print
}' $tmpFile.te.src $tmpFile.te.add |
sort -k 2,3 > $tmpFile.te.rules
# merge rules with same first three fields
cp -f $tmpFile.te.rules $tmpFile.te.rules.to.merge
> $tmpFile.te.rules.merged
while read ruleLine
do
selector=$(echo $ruleLine | cut -d " " -f 1-3)
options=$(awk -v s="$selector" '
BEGIN {OFS="\n"}
{
if ($0 ~ "^"s) {for (i=5; i<NF; i++) {print $i}}
}' $tmpFile.te.rules.to.merge)
mergedOptions=$(echo "$options" | sort -u | tr "\n" " ")
echo "$selector { $mergedOptions };" >> $tmpFile.te.rules.merged
sed -i '/^'"$selector"'/d' $tmpFile.te.rules.to.merge
done < $tmpFile.te.rules
sort -u -k 1,3 $tmpFile.te.rules.merged > $tmpFile.te.rules.uniq
# format rules by blocks
awk '
{
if ($2 != prevApp)
{
prevApp=$2
printf "\n#============= %s ==============\n", $2
}
print
}' $tmpFile.te.rules.uniq >> $tmpFile.te.new
# compile file
checkmodule -M -m -o $tmpFile.mod $tmpFile.te.new
# create policy package file
semodule_package -o $tmpFile.pp -m $tmpFile.mod
# replace policy package file
cp -f $tmpFile.pp $dstDir/$dstFile.pp
# replace type enforcement file
cp -f $tmpFile.te.new $dstDir/$dstFile.te
# clean temp dir up
rm -rf $tmpDir
# tell the next step to do, to install updated SELinux rules
echo "Now, run the command 'semodule -i $dstDir/$dstFile.pp'" |
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