thanhnvandClaude Opus 4.8
e70f0815ab
- SEC-08 pii-mask: fail-closed on missing rules / broken regex (no unmasked leak) - SEC-09: input-size cap + fail-closed reads (security-check/drift-detect/context-compress); non-UTF8 no longer crashes - SEC-19: control-plane store POSIX flock + atomic tmp+rename write - SEC-20: new toolchain-verify.sh (missing/PATH-shadowed/in-workspace binary -> refuse); wired into harness-preflight - SEC-21: model-call timeout 180->60s configurable + per-run call budget - SEC-11 realized by SEC-17 prod profile (no code) - 5 fail-able test suites wired into ci-harness-gate.sh; test-integrity manifest regenerated Verify: SEC+integrity gate 16/0, run-casan4 0-FAIL, adversarial 44/44, no regressions. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
86 lines
3.0 KiB
Python
Executable File
86 lines
3.0 KiB
Python
Executable File
#!/usr/bin/env python3
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"""CASAN H4 PII masker driven by .specify/security/pii-rules.yaml.
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Reads content on stdin, applies every `action: mask` rule from the rules
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file, and writes the masked content to stdout. Type-specific replacement
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tokens are preserved so downstream evidence stays stable
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(***MASKED_EMAIL***, ***MASKED_PHONE***, ***MASKED_ID***).
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This makes pii-rules.yaml the source of truth for PII masking instead of
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dead config: editing/removing a rule changes runtime behavior.
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"""
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import re
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import sys
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REPLACEMENT_BY_TYPE = {
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"email": "***MASKED_EMAIL***",
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"phone": "***MASKED_PHONE***",
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"personal_id": "***MASKED_ID***",
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"address": "***MASKED_ADDRESS***",
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}
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def load_rules(path):
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rules, cur = [], {}
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with open(path, encoding="utf-8") as fh:
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for raw in fh:
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s = raw.strip()
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m = re.match(r"-\s*id:\s*(\S+)", s)
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if m:
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if cur:
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rules.append(cur)
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cur = {"id": m.group(1)}
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continue
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m = re.match(r'type:\s*"?([^"\s]+)"?', s)
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if m:
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cur["type"] = m.group(1)
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continue
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m = re.match(r'regex:\s*"(.*)"\s*$', s)
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if m:
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# YAML double-quoted: collapse \\ -> \ to recover the real regex.
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cur["regex"] = m.group(1).replace("\\\\", "\\")
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continue
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m = re.match(r"action:\s*(\S+)", s)
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if m:
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cur["action"] = m.group(1)
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continue
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if cur:
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rules.append(cur)
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return rules
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def main():
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data = sys.stdin.read()
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# SEC-08 (M-06): FAIL CLOSED. Previously a missing rules file, an unreadable
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# file, or a broken rule regex all emitted the RAW data — so a mask rule that
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# failed to load silently leaked the PII it was meant to hide. Now any such
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# condition emits NOTHING and exits non-zero: no unmasked content ever escapes.
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if len(sys.argv) < 2:
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sys.stderr.write("PII_MASK_FAIL no rules file provided (fail-closed)\n")
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return 1
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try:
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rules = load_rules(sys.argv[1])
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except OSError as exc:
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sys.stderr.write(f"PII_MASK_FAIL rules file unreadable (fail-closed): {exc}\n")
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return 1
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# Pre-compile every mask rule; a broken regex is fatal (that PII type would
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# otherwise pass through unmasked). Validate all BEFORE emitting anything.
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compiled = []
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for rule in rules:
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if rule.get("action") != "mask" or "regex" not in rule:
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continue
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token = REPLACEMENT_BY_TYPE.get(rule.get("type", ""), "***MASKED***")
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try:
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compiled.append((re.compile(rule["regex"]), token))
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except re.error as exc:
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sys.stderr.write(f"PII_MASK_FAIL bad regex in rule {rule.get('id')} (fail-closed): {exc}\n")
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return 1
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for rx, token in compiled:
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data = rx.sub(token, data)
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sys.stdout.write(data)
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return 0
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if __name__ == "__main__":
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raise SystemExit(main())
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