jcv-dev
551b42eab5
Close the gaps between the documented contract (API-STANDARD, TENANCY, ENTITLEMENTS) and the implementation, and remove committed build artifacts. Security: - verify + process inbound webhooks (HMAC/handler verify, size limit, timestamp tolerance, idempotency via InboundEvent.external_id) - real 2FA login flow (pre-auth challenge; tokens only after verify/recovery) - wire HybridPermission into security/audit views; add API-key rotate and users/<id>/permissions|roles endpoints - tenant-scoped throttling on by default; webhook replay protection - verify MercadoPago webhook signatures - login brute-force guard, configurable password policy, real ALTCHA PoW Correctness: - apply verified billing webhooks idempotently (subscription/entitlement/ invoice/PaymentTransaction); scheduled payment lifecycle jobs - capture audit update diffs automatically; add audit retention purge - working notification retries, per-channel rate limits, log retention - pluggable virus scanner, upload-size limit, pipeline toggle - feature rollout %/environment targeting; settings-driven registrations - workflow guards (instance cap, route depth, self-assignment, clone on re-entry) - wire every previously-dead INFRASYNTH_* setting; drop truly dead ones Delivery: - README + CHANGELOG; CI format check + coverage gate - keep test media out of the tree; untrack .coverage, __pycache__, egg-info, docs/ and invoice artifacts
74 lines
2.6 KiB
Python
74 lines
2.6 KiB
Python
import hashlib
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import secrets
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from datetime import timedelta
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from django.utils import timezone
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from infrasynth.shared.settings_utils import get_setting
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from ..models import ALTCHAChallenge
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class ALTCHAService:
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"""Self-hosted proof-of-work challenge (anti-spam).
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The client must find an integer ``number`` such that the SHA-256 of
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``salt + number`` is divisible by ``difficulty``. Expected work is
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``difficulty`` hashes, so the default of 10 000 is a strong-enough speed
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bump while staying cheap for a real browser.
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"""
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def create_challenge(self) -> dict:
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difficulty = int(get_setting("INFRASYNTH_SECURITY", "ALTCHA_DIFFICULTY", 10000))
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expiry_seconds = int(get_setting("INFRASYNTH_SECURITY", "ALTCHA_CHALLENGE_EXPIRY_SECONDS", 300))
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challenge_id = secrets.token_hex(32)
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salt = secrets.token_hex(16)
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expires_at = timezone.now() + timedelta(seconds=expiry_seconds)
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ALTCHAChallenge.objects.create(
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challenge_id=challenge_id,
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salt=salt,
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difficulty=difficulty,
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expires_at=expires_at,
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)
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return {
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"challenge_id": challenge_id,
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"salt": salt,
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"difficulty": difficulty,
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"algorithm": "SHA-256",
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}
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def verify(self, challenge_id: str, solution: str, number) -> bool:
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try:
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number = int(number)
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except (TypeError, ValueError):
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return False
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try:
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challenge = ALTCHAChallenge.objects.get(challenge_id=challenge_id, is_verified=False)
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except ALTCHAChallenge.DoesNotExist:
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return False
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if challenge.expires_at < timezone.now():
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return False
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expected = hashlib.sha256(f"{challenge.salt}{number}".encode()).hexdigest()
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if not solution or solution != expected:
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return False
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if int(expected, 16) % challenge.difficulty != 0:
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return False
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challenge.is_verified = True
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challenge.save(update_fields=["is_verified"])
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return True
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def compute_solution(self, salt: str, difficulty: int, *, max_iterations: int = 5_000_000) -> tuple[str, int]:
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"""Reference solver (clients do this in JS; used in tests/tools)."""
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difficulty = max(1, int(difficulty))
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number = 0
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while number < max_iterations:
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h = hashlib.sha256(f"{salt}{number}".encode()).hexdigest()
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if int(h, 16) % difficulty == 0:
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return h, number
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number += 1
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raise RuntimeError("Could not find an ALTCHA solution within max_iterations.")
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