def _assign_keys(self, as_):
isd_as_id = as_.isd_as_str()
chain = self.loader.certs[isd_as_id]
as_.certificate_chain = chain
assert (chain['0']['Subject'] == isd_as_id)
as_.sig_pub_key = chain['0']['SubjectSignKey']
as_.enc_pub_key = chain['0']['SubjectEncKey']
as_.sig_priv_key = self.loader.keys_sig[isd_as_id]
as_.enc_priv_key = self.loader.keys_decrypt[isd_as_id]
as_.master_as_key = self.loader.master0s[isd_as_id]
if as_.is_core:
trc = self.loader.trcs[as_.isd.isd_id]
as_.core_offline_priv_key = self.loader.core_keys_offline[
isd_as_id]
as_.core_offline_pub_key = trc['CoreASes'][isd_as_id]['OfflineKey']
as_.core_online_priv_key = self.loader.core_keys_online[isd_as_id]
as_.core_online_pub_key = trc['CoreASes'][isd_as_id]['OnlineKey']
as_.core_sig_priv_key = self.loader.core_keys_sig[isd_as_id]
as_.core_sig_pub_key = base64.b64encode(
SigningKey(base64.b64decode(
as_.core_sig_priv_key)).verify_key._key).decode()
core_cert = Certificate(
chain['1']) # load the one from the json file and adapt it
core_cert.subject = as_.isd_as_str()
core_cert.issuer = as_.isd_as_str() # self signed
core_cert.subject_enc_key = ''
core_cert.subject_sig_key = as_.core_sig_pub_key
core_cert.sign(base64.b64decode(as_.core_online_priv_key))
as_.core_certificate = core_cert.dict()
# redo the AS cert in the chain
cert = Certificate(chain['0'])
cert.issuer = as_.isd_as_str()
cert.sign(base64.b64decode(as_.core_sig_priv_key))
as_.certificate_chain = {'0': cert.dict(), '1': core_cert.dict()}
as_.save()
def generate_as_certificate_chain(subject_as, issuing_as):
"""
Create or update the AS Certificate for `subject_as`, issued by `issuing_as`.
If the AS already has an AS Certificate, the version number is incremented for the
new certificate.
Requires that `issuing_as` is a core AS with an existing/up to date Core AS Certificate.
Requires that the ASes are in the same ISD and that the TRC exists/is up to date.
:param AS subject_as: Subject AS
:param AS issuing_AS: Issuing AS
:returns: the AS Certificate chain as a dict
"""
assert issuing_as.is_core
assert issuing_as.core_certificate
assert issuing_as.isd == subject_as.isd
isd = issuing_as.isd
assert isd.trc
trc_version = isd.trc['Version']
if subject_as.certificate_chain:
version = subject_as.certificate_chain["0"]['Version'] + 1
else:
version = 1
core_as_cert = Certificate(issuing_as.core_certificate)
cert = Certificate.from_values(
subject=subject_as.isd_as_str(),
issuer=issuing_as.isd_as_str(),
trc_version=trc_version,
version=version,
comment="AS Certificate",
can_issue=False,
validity_period=core_as_cert.expiration_time - int(time.time()) - 1,
subject_enc_key=base64.b64decode(
subject_as.enc_pub_key), # will be encoded again, but WTH
subject_sig_key=base64.b64decode(subject_as.sig_pub_key),
iss_priv_key=base64.b64decode(issuing_as.core_sig_priv_key))
# CertificateChain does NOT have a dict method (only "to_json"), so we just do this manually:
cert_chain_dict = {"0": cert.dict(), "1": core_as_cert.dict()}
return cert_chain_dict
