osquery-defense-kit/policy/gcp-service-account-keys-mdfind.sql

-- Indicative of stored GCP service account keys just sitting around unencrypted
--
-- tags: persistent state filesystem
-- platform: darwin
SELECT
  file.path,
  file.size,
  datetime(file.btime, 'unixepoch') AS file_created,
  magic.data,
  hash.sha256,
  u.username,
  ea.value AS url
FROM
  mdfind
  JOIN file ON mdfind.path = file.path
  LEFT JOIN users u ON file.uid = u.uid
  LEFT JOIN hash ON mdfind.path = hash.path
  LEFT JOIN extended_attributes ea ON mdfind.path = ea.path
  AND ea.key = 'where_from'
  LEFT JOIN magic ON mdfind.path = magic.path
  LEFT JOIN signature ON mdfind.path = signature.path
WHERE
  mdfind.query = "kMDItemFSName == '*.json'"
  AND (
    file.filename LIKE "%-%-%.json"
    OR file.filename LIKE '%service%.json'
    OR file.filename LIKE '%acct%.json'
    OR file.filename LIKE '%key%.json'
    OR file.filename LIKE '%account%.json'
    OR file.filename LIKE '%-sa.json'
    OR file.filename LIKE 'sa%.json'
    OR file.filename LIKE '%s%r%v%acc%t%json'
    OR file.filename LIKE '%prod.json'
    OR file.filename LIKE 'prod%.json'
  )
  AND file.size BETWEEN 2311 AND 2385 -- Don't alert on tokens that begin with the username-, as they may be personal
  AND NOT INSTR(file.filename, CONCAT (u.username, "-")) == 1 -- Don't alert on tokens that begin with the users full name and a dash
  AND NOT (
    LENGTH(u.username) > 4
    AND INSTR(file.filename, SUBSTR(u.username, 3,8)) > 0
  )
  AND NOT INSTR(
    file.filename,
    REPLACE(LOWER(TRIM(u.description)), " ", "-")
  ) == 1
  -- Common locations of test or demo keys
  AND NOT file.directory LIKE '%/go/pkg/%'
  AND NOT file.directory LIKE '%/go/src/%'
  AND NOT file.directory LIKE '%/pkg/mod/%'
  AND NOT file.directory LIKE '%/aws-sdk/apis'
  AND NOT file.directory LIKE '%/mock-infras/%'
  AND NOT file.directory LIKE '%/testdata%'
  AND NOT file.directory LIKE '%/third_party/%'
  AND NOT file.directory LIKE '%/generated/%'
  AND NOT file.directory LIKE '%/json%'
  AND NOT file.directory LIKE '%/schemas'
  AND NOT file.directory LIKE '/Users/%/Library/Application Support/%'
  AND NOT file.directory LIKE '%demo'
  AND NOT file.filename LIKE 'ntia-conformance-%'
  AND NOT file.filename LIKE '%spdx%'
  -- Common filenames that are non-controversial
  --  AND NOT file.filename LIKE 'redshift-%'
  -- AND NOT file.filename LIKE 'update-%'
  -- AND NOT file.filename LIKE 'pool-%'
  -- AND NOT file.filename LIKE 'organizations-%'
  -- AND NOT file.filename LIKE '%-paginators.json'
  -- Well known demo keys
  AND NOT hash.sha256 IN (
    '2d330d059f4af4d314a85418fb031ee628f41dcf3e31fbce46858e52e73180c4',
    '8d740893c1f9163ddfd8c193d9a95caf15da3740b42f2739c4b107ad12661809',
    '998ddcb7d1a7c2931c8546576873e47b399f23cef719227052f245c8240c6528',
    'af1a2f8e9d581bb1504e3d8801d15d962fdf12ee7ebcf2bb9c475c8b92da6472',
    '6e55f3eccad59a615189c82cbcbd1133ce94509f7c5d42e3e7fbd00e65f0731f',
    '11ffc5141b4b0071c0796914deef68d012c4f4c289931c5587fe89d7d6dca0a1',
    '2d330d059f4af4d314a85418fb031ee628f41dcf3e31fbce46858e52e73180c4',
    'b68896dc8e8c23ade371cf8b5c9d25853d81b4cfa5baa2bc0200d9242a903d80',
    'cea85342377ef1bce115629c3d9d3ec405964a43545805c9f7ace98940aa0be2',
    'ef2c928c69403e023a332002d8c5c430e1022850b12f834563f6aec111d99f14'
  )
GROUP BY
  file.path