2018-12-11 15:29:09 +01:00
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import sys
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import io
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import json
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2018-07-11 23:43:42 +02:00
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try:
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2019-01-21 14:14:19 +01:00
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from sigma.parser.collection import SigmaCollectionParser
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from sigma.configuration import SigmaConfiguration
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from sigma.backends.base import BackendOptions
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from sigma.backends.discovery import getBackend
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2018-09-08 02:53:15 +02:00
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except ImportError:
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2018-07-11 23:43:42 +02:00
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print("sigma or yaml is missing, use 'pip3 install sigmatools' to install it.")
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misperrors = {'error': 'Error'}
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mispattributes = {'input': ['sigma'], 'output': ['text']}
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moduleinfo = {'version': '0.1', 'author': 'Christian Studer', 'module-type': ['expansion', 'hover'],
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'description': 'An expansion hover module to display the result of sigma queries.'}
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moduleconfig = []
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sigma_targets = ('es-dsl', 'es-qs', 'graylog', 'kibana', 'xpack-watcher', 'logpoint', 'splunk', 'grep', 'wdatp', 'splunkxml', 'arcsight', 'qualys')
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2018-12-11 15:29:09 +01:00
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2018-07-11 23:43:42 +02:00
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def handler(q=False):
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if q is False:
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return False
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request = json.loads(q)
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if not request.get('sigma'):
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misperrors['error'] = 'Sigma rule missing'
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return misperrors
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config = SigmaConfiguration()
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backend_options = BackendOptions(None)
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f = io.TextIOWrapper(io.BytesIO(request.get('sigma').encode()), encoding='utf-8')
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parser = SigmaCollectionParser(f, config, None)
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targets = []
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old_stdout = sys.stdout
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result = io.StringIO()
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sys.stdout = result
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for t in sigma_targets:
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backend = getBackend(t)(config, backend_options, None)
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try:
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parser.generate(backend)
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backend.finalize()
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print("#NEXT")
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targets.append(t)
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2018-12-11 15:29:09 +01:00
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except Exception:
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2018-07-11 23:43:42 +02:00
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continue
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sys.stdout = old_stdout
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results = result.getvalue()[:-5].split('#NEXT')
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2018-12-11 15:29:09 +01:00
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d_result = {t: r.strip() for t, r in zip(targets, results)}
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2018-07-11 23:43:42 +02:00
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return {'results': [{'types': mispattributes['output'], 'values': d_result}]}
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2018-12-11 15:29:09 +01:00
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2018-07-11 23:43:42 +02:00
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def introspection():
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return mispattributes
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2018-12-11 15:29:09 +01:00
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2018-07-11 23:43:42 +02:00
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def version():
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moduleinfo['config'] = moduleconfig
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return moduleinfo
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