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| from functools import lru_cache | |
| from base64 import b64decode | |
| import requests | |
| from cryptography import x509 | |
| from cryptography.hazmat.backends import default_backend | |
| from cryptography.hazmat.primitives import hashes | |
| from cryptography.hazmat.primitives.asymmetric import padding | |
| def get_raw_msmt(measurement_uid): | |
| r = requests.get(f"https://api.ooni.io/api/v1/raw_measurement?measurement_uid={measurement_uid}") | |
| return r.json() | |
| @lru_cache(maxsize=None) | |
| def load_cert_from_url(url): | |
| d = requests.get(url) | |
| return x509.load_pem_x509_certificate(d.text.encode('ascii')) | |
| def load_cert_from_measurement(raw_msmt): | |
| raw_cert = b64decode(raw_msmt['test_keys']['tls_handshakes'][0]['peer_certificates'][0]['data']) | |
| return x509.load_der_x509_certificate(raw_cert, default_backend()) | |
| POTENTIAL_ROOT_CAS = [ | |
| "https://crt.sh/?d=4478765041", | |
| "https://crt.sh/?d=4833570779", | |
| "https://crt.sh/?d=4739909320", | |
| "https://crt.sh/?d=4633597326", | |
| "https://crt.sh/?d=3967758934", | |
| "https://crt.sh/?d=12281942153", | |
| "https://crt.sh/?d=11106964945", | |
| "https://crt.sh/?d=14682080594", | |
| "https://crt.sh/?d=3764973485", | |
| "https://isca.gov.kz/Information_Security_Certification_Authority_CA_pem.crt", | |
| ] | |
| def find_root_ca(cert): | |
| for url in POTENTIAL_ROOT_CAS: | |
| issuer_cert = load_cert_from_url(url) | |
| issuer_pub_key = issuer_cert.public_key() | |
| try: | |
| issuer_pub_key.verify( | |
| cert.signature, | |
| cert.tbs_certificate_bytes, | |
| padding.PKCS1v15(), | |
| cert.signature_hash_algorithm, | |
| ) | |
| return (url, issuer_cert) | |
| except Exception as e: | |
| pass | |
| return (None, None) | |
| OONI_MEASUREMENTS = [ | |
| "20210808015758.022737_KZ_webconnectivity_3b9213f9ee4f2d06", | |
| "20210914080702.850310_KZ_webconnectivity_88ece394d9a0fcdc", | |
| "20231016130600.035487_KZ_webconnectivity_4a5c38a0f8bea740", | |
| "20240317052821.044604_KZ_webconnectivity_3752cbf5dac624e9", | |
| "20231118140134.149173_KZ_webconnectivity_a93dfc958ab79ec2", | |
| "20240418133819.497733_KZ_webconnectivity_bd3a0d69cd5e8aca", | |
| "20240901151413.637888_KZ_webconnectivity_c351db70f739197a" | |
| ] | |
| def print_cert_meta(cert, prefix=""): | |
| fp = cert.fingerprint(hashes.SHA1()).hex() | |
| serial = cert.serial_number | |
| issuer = cert.issuer.rfc4514_string() | |
| nvb = cert.not_valid_before.strftime("%Y-%m-%d %H:%M:%S") | |
| nva = cert.not_valid_after.strftime("%Y-%m-%d %H:%M:%S") | |
| print(f"{prefix}Fingerprint: {fp}") | |
| print(f"{prefix}Serial: {serial}") | |
| print(f"{prefix}Not valid before: {nvb}") | |
| print(f"{prefix}Not valid after: {nva}") | |
| def print_meta(msmt_uid, cert, root_ca_url, root_ca): | |
| print(f"[ooni measurement](https://explorer.ooni.org/m/{msmt_uid})") | |
| print("```") | |
| print_cert_meta(cert) | |
| print(f"Issuer: {cert.issuer.rfc4514_string()}") | |
| if root_ca_url: | |
| print(f"Root CA Cert: {root_ca_url}") | |
| print_cert_meta(root_ca, prefix="Root CA ") | |
| else: | |
| print("Root CA Unknown") | |
| print("```") | |
| for msmt_uid in sorted(OONI_MEASUREMENTS): | |
| raw_msmt = get_raw_msmt(msmt_uid) | |
| cert = load_cert_from_measurement(raw_msmt) | |
| root_ca_url, root_ca = find_root_ca(cert) | |
| print_meta(msmt_uid, cert, root_ca_url, root_ca) |
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