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91 lines
4.5 KiB
Bash
Executable File
91 lines
4.5 KiB
Bash
Executable File
#!/bin/sh
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#
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# In-container half of the ARTEX Sigma backend-portability test. run.sh launches
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# this inside a Python container with the Sigma rule tree mounted read-only at
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# /sigma. It installs a pinned sigma-cli (pySigma) plus four stable backends and
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# proves that the rules convert beyond the single Splunk example the README used
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# to show, and that the documented per-backend guidance is true for OUR rules.
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#
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# The base Sigma test (../sigma/) proves the rules are correct against Splunk.
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# This test proves they are PORTABLE, and pins the two facts the README's
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# "Validate and convert" section now documents:
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#
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# 1. Correlations are portable the WHOLE tree (atomic + correlation)
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# beyond Splunk converts on splunk, Elasticsearch eql,
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# and Grafana loki (exit 0), and the enrich
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# indicator value survives into each query.
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# 2. The atomic-only fallback works backends that do not support Sigma
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# where correlations are not correlation conversion (Elasticsearch
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# supported lucene, Microsoft kusto) still convert
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# the five atomic rules (exit 0), with the
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# enrich indicator surviving.
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#
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# Every assertion is POSITIVE (a capability that must keep working), so the test
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# only fails on a genuine regression: a rule that stops converting, or a backend
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# that drops support. It deliberately does not assert the negative "backend X
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# cannot do correlations" — that would break when a backend improves. The honest
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# limitation is documented in ../README.md, reproduced by this test's commands.
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#
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# POSIX sh (the slim image ships dash). Exits non-zero if any assertion fails.
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set -eu
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VERSION="${SIGMA_CLI_VERSION:-3.1.0}"
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pip install --quiet --disable-pip-version-check "sigma-cli==${VERSION}" >/dev/null 2>&1
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# elasticsearch ships the lucene + eql targets; the others are one plugin each.
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for plugin in splunk elasticsearch loki kusto; do
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sigma plugin install "$plugin" >/dev/null 2>&1
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done
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ENRICH='artex-enrich/1.0'
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ATOMICS='/sigma/artex_enrich_user_agent.yml /sigma/artex_selfupdate_egress.yml /sigma/artex_guard_audit_framing.yml /sigma/artex_recording_proxy_ca.yml /sigma/destructive_command_hunting.yml'
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fail=0
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note() { printf ' %s\n' "$1"; }
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pass() { note "PASS $1"; }
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bad() { note "FAIL $1"; fail=1; }
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# Backends escape regex metacharacters differently (lucene: artex\-enrich\/1.0,
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# loki: artex\-enrich/1\.0, splunk/eql/kusto: artex-enrich/1.0). Strip backslashes
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# before matching so the indicator-survival check is robust across all of them
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# without asserting any one backend's escaping syntax.
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has_enrich() { printf '%s' "$1" | tr -d '\\' | grep -qF "$ENRICH"; }
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echo "== 1/2 correlations are portable: the whole tree converts beyond Splunk =="
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# Whole-tree conversion includes the four correlation rules, which reference
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# their atomic base rules by id. If a backend compiles the whole tree at exit 0
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# it supports Sigma correlation conversion for our rules.
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for target in splunk eql loki; do
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if out="$(sigma convert -t "$target" --without-pipeline /sigma 2>&1)" \
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&& has_enrich "$out"; then
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pass "whole tree (atomic + correlation) converts on '$target', enrich indicator survives"
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else
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bad "whole-tree conversion on '$target' failed or dropped the enrich indicator"
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printf '%s' "$out" | grep -iE 'error|not supported' | head -2 | sed 's/^/ /'
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fi
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done
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echo "== 2/2 atomic-only fallback: the five atomic rules convert where correlations are not supported =="
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# Lucene and kusto (the Microsoft Sentinel / Defender backend) do not convert
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# Sigma correlations at the pinned versions, so a defender deploys the five
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# atomic rules and expresses the correlation logic natively. That fallback must
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# work: all five atomic rules convert and the enrich indicator survives.
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for target in lucene kusto; do
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if out="$(sigma convert -t "$target" --without-pipeline $ATOMICS 2>&1)" \
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&& has_enrich "$out"; then
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pass "five atomic rules convert on '$target', enrich indicator survives"
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else
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bad "atomic-only conversion on '$target' failed or dropped the enrich indicator"
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printf '%s' "$out" | grep -iE 'error|not supported' | head -2 | sed 's/^/ /'
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fi
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done
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echo
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echo "reference: sigma-cli ${VERSION}; backends splunk, elasticsearch (lucene/eql), loki, kusto (latest compatible), pySigma"
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if [ "$fail" -eq 0 ]; then
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echo "RESULT: PASS"
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else
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echo "RESULT: FAIL"
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fi
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exit "$fail"
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