Files
blue-team-tools/.github/workflows/matchgrep.sh
T
2022-02-22 15:23:05 +01:00

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#!/bin/bash
infile=$1
fps=$2
if [[ -z ${infile} || -z ${fps} ]]; then
>&2 echo "usage: $0 [json-file] [FPs.csv]"
exit 1
fi
if [[ ! -f ${infile} || ! -r ${infile} ]]; then
>&2 echo "${infile} is not a valid, readable file"
exit 2
fi
if [[ ! -f ${fps} || ! -r ${fps} ]]; then
>&2 echo "${fps} is not a valid, readable file"
exit 2
fi
# Exclude all rules with level "low"
findings=$(grep -v '"RuleLevel":"low"' ${infile})
{
read # Skip CSV header
while IFS=\; read -r id name fpstring; do
findings=$(echo "${findings}" | grep -iEv "\"RuleId\":\"${id}\".*${fpstring}")
done
} < ${fps}
if [[ -z ${findings} ]]; then
echo "No matches found."
else
>&2 echo "Found matches:"
echo "${findings}"
>&2 echo
>&2 echo "Match overview:"
echo ${findings} | jq -c '. | {RuleId, RuleTitle, RuleLevel}' | sort | uniq -c | sort -nr >&2
>&2 echo
>&2 echo "You either need to tune your rule(s) for false positives or add a false positive filter to .github/workflows/known-FPs.csv"
exit 3
fi