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osmo-smdpp: Implement 'other' notification signature validation

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"other" notifications (enable, disable, delete) contain ECDSA
signatures that also need verification.

Change-Id: If610058b7af6f9fc7822576c93f9970e2ce9aba9
This commit is contained in:
Harald Welte
2024-07-15 20:24:49 +02:00
parent 3ad3da8995
commit 5370178ca2
1 changed files with 24 additions and 4 deletions
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28
osmo-smdpp.py
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@@ -35,7 +35,7 @@ import asn1tools
from pySim.utils import h2b, b2h, swap_nibbles
import pySim.esim.rsp as rsp
from pySim.esim import saip
from pySim.esim import saip, PMO
from pySim.esim.es8p import *
from pySim.esim.x509_cert import oid, cert_policy_has_oid, cert_get_auth_key_id
from pySim.esim.x509_cert import CertAndPrivkey, CertificateSet, cert_get_subject_key_id, VerifyError
@@ -494,13 +494,33 @@ class SmDppHttpServer:
pird_bin = rsp.asn1.encode('ProfileInstallationResultData', pird)
# verify eUICC signature
if not self._ecdsa_verify(ss.euicc_cert, profileInstallRes['euiccSignPIR'], pird_bin):
print("Unable to verify eUICC signature")
raise Exception('ECDSA signature verification failed on notification')
print("Profile Installation Final Result: ", pird['finalResult'])
# remove session state
del self.rss[transactionId]
elif pendingNotification[0] == 'otherSignedNotification':
# TODO
pass
otherSignedNotif = pendingNotification[1]
# TODO: use some kind of partially-parsed original data, don't re-encode?
euiccCertificate_bin = rsp.asn1.encode('Certificate', otherSignedNotif['euiccCertificate'])
eumCertificate_bin = rsp.asn1.encode('Certificate', otherSignedNotif['eumCertificate'])
euicc_cert = x509.load_der_x509_certificate(euiccCertificate_bin)
eum_cert = x509.load_der_x509_certificate(eumCertificate_bin)
ci_cert_id = cert_get_auth_key_id(eum_cert)
# Verify the validity of the eUICC certificate chain
cs = CertificateSet(self.ci_get_cert_for_pkid(ci_cert_id))
cs.add_intermediate_cert(eum_cert)
# TODO v3: otherCertsInChain
cs.verify_cert_chain(euicc_cert)
tbs_bin = rsp.asn1.encode('NotificationMetadata', otherSignedNotif['tbsOtherNotification'])
if not self._ecdsa_verify(euicc_cert, otherSignedNotif['euiccNotificationSignature'], tbs_bin):
raise Exception('ECDSA signature verification failed on notification')
other_notif = otherSignedNotif['tbsOtherNotification']
pmo = PMO.from_bitstring(other_notif['profileManagementOperation'])
eid = euicc_cert.subject.get_attributes_for_oid(x509.oid.NameOID.SERIAL_NUMBER)[0].value
iccid = other_notif.get('iccid', None)
if iccid:
iccid = swap_nibbles(b2h(iccid))
print("handleNotification: EID %s: %s of %s" % (eid, pmo, iccid))
else:
raise ValueError(pendingNotification)