Squid external ACL helper that allows use of AWS instance metadata
This module implements the Squid External ACL Helper interface, and allows for use of EC2 instance metadata in ACL entries. It uses the client’s source address (either public or private) as a key to determine which instance initiated a request through the proxy, and allows use of instance metadata (such as Instance ID, VPC, or Security Group membership) as a rule target.
If the request can be mapped to an EC2 instance, the module will populate the EC2 Instance ID into the request’s ‘user’ field, for consumption by additional ACLs or output to logs. This occurs regardless of whether or not the ACL matched.
This module requires Python 3.4 or better, due to its use of the asyncio framework (aioredis, etc)
This module requires a Redis server to cache AWS instance metadata. Redis clusters are not currently supported; use of a local Redis instance is recommended.
This module uses Boto3 to retrieve EC2 instance metadata from AWS. You should have a working AWS API environment (~/.aws/credentials, environment variables, or EC2 IAM Role) that allows calling EC2’s describe-instances method against the account that Squid is running in.
Consult README.md on GitHub for usage instructions.
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