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smdpp: verify cert chain

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Change-Id: I1e4e4b1b032dc6a8b7d15bd80d533a50fe0cff15
This commit is contained in:
Eric Wild
2025-06-25 10:22:42 +02:00
parent dc5fdd34bf
commit f98b1a0080
1 changed files with 20 additions and 7 deletions
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27
osmo-smdpp.py
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@@ -311,6 +311,20 @@ class SmDppHttpServer:
return cert
return None
def validate_certificate_chain_for_verification(self, euicc_ci_pkid_list: List[bytes]) -> bool:
"""Validate that SM-DP+ has valid certificate chains for the given CI PKIDs."""
for ci_pkid in euicc_ci_pkid_list:
ci_cert = self.ci_get_cert_for_pkid(ci_pkid)
if ci_cert:
# Check if our DPauth certificate chains to this CI
try:
cs = CertificateSet(ci_cert)
cs.verify_cert_chain(self.dp_auth.cert)
return True
except VerifyError:
continue
return False
def __init__(self, server_hostname: str, ci_certs_path: str, common_cert_path: str, use_brainpool: bool = False):
self.server_hostname = server_hostname
self.upp_dir = os.path.realpath(os.path.join(DATA_DIR, 'upp'))
@@ -394,6 +408,12 @@ class SmDppHttpServer:
pkid_list = euiccInfo1['euiccCiPKIdListForSigning']
if 'euiccCiPKIdListForSigningV3' in euiccInfo1:
pkid_list = pkid_list + euiccInfo1['euiccCiPKIdListForSigningV3']
# Validate that SM-DP+ supports certificate chains for verification
verification_pkid_list = euiccInfo1.get('euiccCiPKIdListForVerification', [])
if verification_pkid_list and not self.validate_certificate_chain_for_verification(verification_pkid_list):
raise ApiError('8.8.4', '3.7', 'The SM-DP+ has no CERT.DPauth.SIG which chains to one of the eSIM CA Root CA Certificate with a Public Key supported by the eUICC')
# verify it supports one of the keys indicated by euiccCiPKIdListForSigning
ci_cert = None
for x in pkid_list:
@@ -408,13 +428,6 @@ class SmDppHttpServer:
if not ci_cert:
raise ApiError('8.8.2', '3.1', 'None of the proposed Public Key Identifiers is supported by the SM-DP+')
# TODO: Determine the set of CERT.DPauth.SIG that satisfy the following criteria:
# * Part of a certificate chain ending at one of the eSIM CA RootCA Certificate, whose Public Keys is
# supported by the eUICC (indicated by euiccCiPKIdListForVerification).
# * Using a certificate chain that the eUICC and the LPA both support:
#euiccInfo1['euiccCiPKIdListForVerification']
# raise ApiError('8.8.4', '3.7', 'The SM-DP+ has no CERT.DPauth.SIG which chains to one of the eSIM CA Root CA CErtificate with a Public Key supported by the eUICC')
# Generate a TransactionID which is used to identify the ongoing RSP session. The TransactionID
# SHALL be unique within the scope and lifetime of each SM-DP+.
transactionId = uuid.uuid4().hex.upper()