![]() "Resource": "arn:aws:ssm:*::document/AWS-StartPortForwardingSession" "arn:aws:ssm:*::document/AWS-StartPortForwardingSession" Here is one example that would allow a user to establish a session with any instances tagged with platform = acme We have several policies in place depending on the access required for a specific user. In our use case, we tag everything in AWS using several dimensions so tags are a great way to easily grant access. Session manager access control is configured using standard IAM policies. A custom Elastic Beanstalk extension to manage keys for SSH tunnels over session manager sessions.Some custom tooling we wrote around session manager.How we’ve setup session manager access control with IAM.Rather than rehash setup, I’ll cover a few items which we needed to customize. There are many great articles on how to set up and configure session manager (not the least of which is the official AWS blog post which introduced the feature). As a huge bonus, SSH can be tunnelled over a session manager session! This can be used to provide access to private RDS databases.Access control is via standard IAM policies and can be configured for tag based resource access.All user sessions and commands are logged to Cloudwatch logs (or S3) with optional encryption via KMS.No inbound security group rules are required for public instances - all communication is via the Systems Manager service.VPC endpoints to Systems Manager are all that is required. Instances in private subnets can be connected to even without a NAT gateway being present.There is! AWS Systems Manager Session Manager (let’s call it session manager for short.) Session manager allows one to make an interactive shell connection to an EC2 instance with several key features: ![]() ![]() Surely there has to be something better for managing access control for shell sessions? We had instances locked down fairly tight using security groups and only allowing SSH from a VPN source IP, which worked well, but we still had the problem of shared keys (AWS Elastic Beanstalk uses a single SSH key for all instances in the Beanstalk). Hostname ec2-y.y.y.y. Rewind, we generally subscribe to the “ treat your servers like cattle, not pets” mantra yet we still have the occasional requirement to log in to EC2 instances using SSH. ![]() So I'm thinking to something like this:ĬLIENT-ssm_session-BASTION-ssh-INSTANCEīut in that case we would need to create an SSH tunnel each instance we want to connect and keep track of the local ports, I don't think it's feasible if we want to connect to a remote instance on the fly like we do now with this ssh config: Host bastion We would like to get rid of SSH of course, but we still want to use the bastion to connect to the instances, since for a number of reasons we can't/don't want to install the SSM agent on them. We currently have a classic setup with a SSH bastion host and a bunch of instances we connect to through this bastion host. If you're posting a technical query, please include the following details, so that we can help you more efficiently:ĭoes this sidebar need an addition or correction? Tell us here public IP addresses or hostnames, account numbers, email addresses) before posting! ✻ Smokey says: do not build swimming pools, or decorative water features, to fight climate change! Note: ensure to redact or obfuscate all confidential or identifying information (eg. News, articles and tools covering Amazon Web Services (AWS), including S3, EC2, SQS, RDS, DynamoDB, IAM, CloudFormation, AWS-CDK, Route 53, CloudFront, Lambda, VPC, Cloudwatch, Glacier and more.
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