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Implement Refreshable Chained AWS Session for Multi-Account Role Assumption #59

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Implement Refreshable Chained AWS Session for Multi-Account Role Assumption #59

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e9517ec
setup token chain using the AWS proxy account
sgandhi1311 Oct 30, 2024
6d09902
Refactor the code
sgandhi1311 Oct 30, 2024
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2 changes: 1 addition & 1 deletion tap_dynamodb/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@

LOGGER = singer.get_logger()

REQUIRED_CONFIG_KEYS = ["account_id", "external_id", "role_name", "region_name"]
REQUIRED_CONFIG_KEYS = ["account_id", "external_id", "role_name", "region_name", "proxy_account_id", "proxy_external_id", "proxy_role_name"]

def do_discover(config):
'''
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64 changes: 46 additions & 18 deletions tap_dynamodb/dynamodb.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,8 @@
AssumeRoleCredentialFetcher,
CredentialResolver,
DeferredRefreshableCredentials,
JSONFileCache
JSONFileCache,
RefreshableCredentials
)
from botocore.session import Session
from botocore.config import Config
Expand Down Expand Up @@ -49,33 +50,60 @@ def load(self):

@retry_pattern()
def setup_aws_client(config):
"""
Setup the aws session for making the API calls
"""
role_arn = "arn:aws:iam::{}:role/{}".format(config['account_id'].replace('-', ''),
config['role_name'])

session = Session()
fetcher = AssumeRoleCredentialFetcher(
session.create_client,
session.get_credentials(),
role_arn,
proxy_role_arn = "arn:aws:iam::{}:role/{}".format(config['proxy_account_id'].replace('-', ''),config['proxy_role_name'])
cust_role_arn = "arn:aws:iam::{}:role/{}".format(config['account_id'].replace('-', ''),config['role_name'])

# Step 1: Assume Role in Account Proxy and set up refreshable session
session_proxy = Session()
fetcher_proxy = AssumeRoleCredentialFetcher(
client_creator=session_proxy.create_client,
source_credentials=session_proxy.get_credentials(),
role_arn=proxy_role_arn,
extra_args={
'DurationSeconds': 3600,
'RoleSessionName': 'TapDynamodDB',
'RoleSessionName': 'ProxySession',
'ExternalId': config['proxy_external_id']
},
cache=JSONFileCache()
)

# Refreshable credentials for Account Proxy
refreshable_credentials_proxy = RefreshableCredentials.create_from_metadata(
metadata=fetcher_proxy.fetch_credentials(),
refresh_using=fetcher_proxy.fetch_credentials,
method="sts-assume-role"
)

# Step 2: Use Proxy Account's session to assume Role in Customer Account
session_cust = Session()
fetcher_cust = AssumeRoleCredentialFetcher(
client_creator=session_cust.create_client,
source_credentials=refreshable_credentials_proxy,
role_arn=cust_role_arn,
extra_args={
'DurationSeconds': 3600,
'RoleSessionName': 'CustSession',
'ExternalId': config['external_id']
},
cache=JSONFileCache()
)

refreshable_session = Session()
refreshable_session.register_component(
# # Refreshable credentials for Account Customer
# refreshable_credentials_c = RefreshableCredentials.create_from_metadata(
# metadata=fetcher_cust.fetch_credentials(),
# refresh_using=fetcher_cust.fetch_credentials,
# method="sts-assume-role"
# )

# Set up refreshable session for Customer Account
refreshable_session_cust = Session()
refreshable_session_cust.register_component(
'credential_provider',
CredentialResolver([AssumeRoleProvider(fetcher)])
CredentialResolver([AssumeRoleProvider(fetcher_cust)])
)

LOGGER.info("Attempting to assume_role on RoleArn: %s", role_arn)
boto3.setup_default_session(botocore_session=refreshable_session)
LOGGER.info("Attempting to assume_role on RoleArn: %s", cust_role_arn)
boto3.setup_default_session(botocore_session=refreshable_session_cust)

def get_request_timeout(config):
# if request_timeout is other than 0,"0" or "" then use request_timeout
Expand Down