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###############################################################################
#
# The MIT License (MIT)
#
# Copyright (c) Crossbar.io Technologies GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
###############################################################################
from binascii import a2b_hex
from typing import List, Tuple, Dict, Any, Union
from autobahn.xbr._eip712_delegate_certificate import EIP712DelegateCertificate
from autobahn.xbr._eip712_authority_certificate import EIP712AuthorityCertificate
def parse_certificate_chain(certificates: List[Tuple[Dict[str, Any], str]]) \
-> List[Union[EIP712DelegateCertificate, EIP712AuthorityCertificate]]:
"""
:param certificates:
:return:
"""
# parse the whole certificate chain
cert_chain = []
cert_sigs = []
for cert_data, cert_sig in certificates:
if cert_data['primaryType'] == 'EIP712DelegateCertificate':
cert = EIP712DelegateCertificate.parse(cert_data['message'])
elif cert_data['primaryType'] == 'EIP712AuthorityCertificate':
cert = EIP712AuthorityCertificate.parse(cert_data['message'])
else:
assert False, 'should not arrive here'
cert_chain.append(cert)
cert_sigs.append(cert_sig)
# FIXME: allow length 2 and length > 3
assert len(cert_chain) == 3
# Certificate Chain Rules (CCR):
#
# 1. **CCR-1**: The `chainId` and `verifyingContract` must match for all certificates to what we expect, and `validFrom` before current block number on the respective chain.
# 2. **CCR-2**: The `realm` must match for all certificates to the respective realm.
# 3. **CCR-3**: The type of the first certificate in the chain must be a `EIP712DelegateCertificate`, and all subsequent certificates must be of type `EIP712AuthorityCertificate`.
# 4. **CCR-4**: The last certificate must be self-signed (`issuer` equals `subject`), it is a root CA certificate.
# 5. **CCR-5**: The intermediate certificate's `issuer` must be equal to the `subject` of the previous certificate.
# 6. **CCR-6**: The root certificate must be `validFrom` before the intermediate certificate
# 7. **CCR-7**: The `capabilities` of intermediate certificate must be a subset of the root cert
# 8. **CCR-8**: The intermediate certificate's `subject` must be the delegate certificate `delegate`
# 9. **CCR-9**: The intermediate certificate must be `validFrom` before the delegate certificate
# 10. **CCR-10**: The root certificate's signature must be valid and signed by the root certificate's `issuer`.
# 11. **CCR-11**: The intermediate certificate's signature must be valid and signed by the intermediate certificate's `issuer`.
# 12. **CCR-12**: The delegate certificate's signature must be valid and signed by the `delegate`.
# CCR-1
chainId = 1
verifyingContract = a2b_hex('0xf766Dc789CF04CD18aE75af2c5fAf2DA6650Ff57'[2:])
for cert in cert_chain:
assert cert.chainId == chainId
assert cert.verifyingContract == verifyingContract
# CCR-2
realm = a2b_hex('0xA6e693CC4A2b4F1400391a728D26369D9b82ef96'[2:])
for cert in cert_chain[1:]:
assert cert.realm == realm
# CCR-3
assert isinstance(cert_chain[0], EIP712DelegateCertificate)
for i in [1, len(cert_chain) - 1]:
assert isinstance(cert_chain[i], EIP712AuthorityCertificate)
# CCR-4
assert cert_chain[2].subject == cert_chain[2].issuer
# CCR-5
assert cert_chain[1].issuer == cert_chain[2].subject
# CCR-6
assert cert_chain[2].validFrom <= cert_chain[1].validFrom
# CCR-7
assert cert_chain[2].capabilities == cert_chain[2].capabilities | cert_chain[1].capabilities
# CCR-8
assert cert_chain[1].subject == cert_chain[0].delegate
# CCR-9
assert cert_chain[1].validFrom <= cert_chain[0].validFrom
# CCR-10
_issuer = cert_chain[2].recover(a2b_hex(cert_sigs[2]))
assert _issuer == cert_chain[2].issuer
# CCR-11
_issuer = cert_chain[1].recover(a2b_hex(cert_sigs[1]))
assert _issuer == cert_chain[1].issuer
# CCR-12
_issuer = cert_chain[0].recover(a2b_hex(cert_sigs[0]))
assert _issuer == cert_chain[0].delegate
return cert_chain
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