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# -------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for
# license information.
# --------------------------------------------------------------------------
"""
FILE: verify_service_async.py
DESCRIPTION:
This sample demonstrates methods that may be used to check conditions about the Confidential
Ledger service. This sample will print the results of verification methods.
USAGE:
python verify_service_async.py
Set the environment variables with your own values before running the sample:
1) CONFIDENTIALLEDGER_ENDPOINT - the endpoint of the Confidential Ledger.
"""
import asyncio
import hashlib
import logging
import os
import sys
import tempfile
from azure.confidentialledger.aio import ConfidentialLedgerClient
from azure.confidentialledger.certificate.aio import (
ConfidentialLedgerCertificateClient,
)
from azure.identity.aio import DefaultAzureCredential
logging.basicConfig(level=logging.ERROR)
LOG = logging.getLogger()
async def main():
# Set the values of the client ID, tenant ID, and client secret of the AAD application as
# environment variables:
# AZURE_CLIENT_ID, AZURE_TENANT_ID, AZURE_CLIENT_SECRET, CONFIDENTIALLEDGER_ENDPOINT
try:
ledger_endpoint = os.environ["CONFIDENTIALLEDGER_ENDPOINT"]
except KeyError:
LOG.error(
"Missing environment variable 'CONFIDENTIALLEDGER_ENDPOINT' - "
"please set it before running the example"
)
sys.exit(1)
# Under the current URI format, the ledger id is the first part of the ledger endpoint.
# i.e. https://<ledger id>.confidential-ledger.azure.com
ledger_id = ledger_endpoint.replace("https://", "").split(".")[0]
identity_service_client = ConfidentialLedgerCertificateClient() # type: ignore[call-arg]
async with identity_service_client:
ledger_certificate = await identity_service_client.get_ledger_identity(
ledger_id
)
# The Confidential Ledger's TLS certificate must be written to a file to be used by the
# ConfidentialLedgerClient. Here, we write it to a temporary file so that is is cleaned up
# automatically when the program exits.
with tempfile.TemporaryDirectory() as tempdir:
ledger_cert_file = os.path.join(tempdir, f"{ledger_id}.pem")
with open(ledger_cert_file, "w") as outfile:
outfile.write(ledger_certificate["ledgerTlsCertificate"])
print(
f"Ledger certificate has been written to {ledger_cert_file}. "
"It will be deleted when the script completes."
)
# Build a client through AAD
credential = DefaultAzureCredential()
ledger_client = ConfidentialLedgerClient(
ledger_endpoint,
credential=credential,
ledger_certificate_path=ledger_cert_file,
)
# Using the async objects as a context manager ensures they are properly closed after use.
async with credential:
async with ledger_client:
print("Retrieving information that can be used to validate a Confidential Ledger.")
print(
"Consortium members can manage and alter the "
"Confidential Ledger. Microsoft participates in the consortium to maintain the "
"Confidential Ledger instance."
)
consortium = ledger_client.list_consortium_members()
async for member in consortium:
print(
f'\tMember {member["id"]} has certificate (truncated) '
f'{member["certificate"][:24]}...'
)
print(
"The constitution is a collection of JavaScript code that defines actions "
"available to members and vets proposals by members to execute those actions."
)
constitution = await ledger_client.get_constitution()
assert (
constitution["digest"].lower() ==
hashlib.sha256(constitution["script"].encode()).hexdigest().lower()
)
print(f'\tConstitution (truncated): {constitution["script"][:24]}...')
print(f'\tConstitution digest: {constitution["digest"]}')
print(
"Enclave quotes contain material that can be used to cryptographically verify "
"the validity and contents of an enclave."
)
ledger_enclaves = await ledger_client.get_enclave_quotes()
for node_id, quote in ledger_enclaves["enclaveQuotes"].items():
print(
f"\tMRENCLAVE for node {node_id}: {quote['mrenclave']}"
)
if __name__ == "__main__":
asyncio.run(main())
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