Access attempts are logged in AWS CloudTrail.Inbound security group rules are not required for the jump host, as Session Manager is an outbound connection.More easily connecting to workloads in private and isolated subnets.Wego’s new architecture has a number of advantages, including: They found that this solution runs at lower cost than AWS Client VPN and is sufficient for the use case of developers accessing online development environments. Wego designed this architecture, and it was practical and stable for day-to-day use. In this blog post, we layered a VPN over SSH that, in turn, is layered over Session Manager, plus we used temporary SSH keys. You can now connect directly from the developer’s workstation to the RDS DB instance based on its IP address. Make sure the security group for the RDS DB instance allows network access from the jump host. To start sshuttle, use the following command pattern: $ sshuttle -r To install sshuttle, use one of the documented commands: $ pip3 install sshuttle From the developer’s perspective, this works transparently, as if it is regular network traffic. Why do we need to tunnel VPN over SSH, rather than using the earlier TCP over Session Manager? After all, you could use port forwarding to remote hosts using Session Manager as explained in the AWS blog post Use port forwarding in AWS Systems Manager Session Manager to connect to remote hosts.Ī lightweight VPN solution, like sshuttle, simplifies the connectivity by allowing you to forward traffic from Amazon EC2 to Amazon RDS. Tunneling VPN over SSH over Session Manager It runs across a wide range of Linux distributions and on macOS (Figure 6).įigure 6. It is based on Python and released under the LGPL 2.1 license. sshuttle is a transparent proxy server that works as a VPN over SSH. In this section, we adopt a third-party, open-source tool that is not supported by AWS, called sshuttle. Tunneling VPN over SSH, then over Session Manager To install the public key into the EC2 instance, insert: $ aws ec2-instance-connect send-ssh-public-key \įor example: $ aws ec2-instance-connect send-ssh-public-key \Ĭonnect to the EC2 instance within 60 seconds and delete the key after use. To generate a temporary SSH key pair, insert: $ ssh-keygen -t rsa -f my_key Make sure your IAM role or user has the required permissions. This blog post assumes you are using Amazon Linux on the EC2 instance with all pre-requisites installed. Connecting to SSH with temporary keysĮnsure the EC2 instance connect plugin is installed on your workstation: pip3 install ec2instanceconnectcli On the command line, it allows us to install our own temporary access credentials into a private EC2 instance for the duration of 60 seconds (Figure 5).įigure 5. It makes it easier to work with short-lived keys. This is where EC2 Instance Connect comes to the rescue! Replace SSH keys with EC2 Instance ConnectĮC2 Instance Connect is available both on the AWS console and the command line. However, it can be tedious to manage short-lived credentials. You can now connect to the EC2 instance over SSH with the following command: ssh -i example: ssh -i my_key your key-file is a short-lived credential, as recommended by the AWS Well-Architected Framework, as it narrows the window of opportunity for a security breach. To allow a short-hand notation for SSH over SSM, add the following configuration to the ~/.ssh/config configuration file: host i-* mi-* Prox圜ommand sh -c "aws ssm start-session -target %h \ -document-name AWS-StartSSHSession \ -parameters 'portNumber=%p'" Tunneling SSH traffic over Session Manager In this architecture, Session Manager serves as the main entry point for incoming network traffic.įigure 4. Figure 2 demonstrates how Wego moved the jump host from a public subnet to a private subnet. Session Manager helps minimize the likeliness of a security breach. Moving the jump host to a private subnet with Session Manager Despite restrictions to the allowed source IP addresses, exposing Port 22 to the internet can increase the likeliness of a security breach it is possible to spoof (mimic) an allowed IP address and attempt a denial of service attack. In Wego’s previous architecture, the jump host was connected to the internet for terminal access through the secure shell (SSH) protocol, which accepts traffic at Port 22. The diagram illustrates a VPN tunnel between the developer’s desktop and the VPC. The public subnet contains an Amazon Elastic Compute Cloud (Amazon EC2) instance that serves as jump host. Figure 1 demonstrates a network architecture with both public and private subnets.
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