In rare situations, a single bastion host can also be a single point of failure for accessing the internal systems. Challenges with Bastion HostsĪn AWS Bastion Host is a good start to securing infrastructure access for a company from external threats, but implementing it, especially for larger organization sizes has some major challenges that need to be considered: High Availability Terraform scripts for a similar setup are also available here.
Choose VPC and more when creating a new VPC to configure the subnets:ĪWS’s Reference Deployment provides a reference implementation. Jan 4 04:54:56 ip-172-31-25-53 systemd-logind: Removed session 42617.įor an additional layer of security, put the bastion host in a public subnet and the remaining infra in a private subnet. Jan 4 04:54:56 ip-172-31-25-53 sshd: pam_unix(sshd:session): session closed for user admin Openssh on Linux includes logs of successful and failed login attempts, typically in /var/log/auth.log: Jan 4 04:54:55 ip-172-31-25-53 sshd: Accepted publickey for admin from 3.131.228.105 port 53574 ssh2: RSA SHA256:ac6wLNaNL7NpWhfJSSD+T3nHnNQQeXJkyBJKi4kO9Zo If there is a fixed set of IP addresses from which the bastion host will be accessed, allow only those in the inbound rules. When this is an issue, consider allocating an Elastic IP (or Static IP) to the Bastion host. The Bastion host's public IP is likely to change on machine restart.
Additional Considerations Elastic IP (or Static IP) Last login: Tue Jan 3 00:52:15 2023 from ssh -i aws.pem -J option can be used for connecting to the server in a single command. Verify the Setup Connecting directly to the server/DB fails $ ssh -i aws.pem connect to host 13.127.194.184 port 22: Connection timed outĬonnecting via Bastion host works $ ssh -i aws.pem ip-172-31-25-53 4.19.0-21-cloud-amd64 #1 SMP Debian 4.19.249-2 () x86_64 Associate this security group with the rest of your infrastructure. Create a security group to allow SSH access to the bastion host from 0.0.0.0/0 and associate this security group with the bastion host.Ĭreate another security group to allow SSH access only from the bastion host’s IP. Security groups on AWS are used to allow inbound connections on specified ports from specified IPs. This instance will NOT require high CPU/memory resources as it will not run any services except those required for its function as a bastion host. Create an EC2 instance to be used as a bastion host.
Later we also outline additional considerations for a more sophisticated setup.
AWS BASTION HOST QUICK START HOW TO
The below steps show how to create a simple AWS Bastion Host (or jump server) for your infrastructure. Access policies and audit infrastructure are set up just on the bastion host instead on each and every DB and server. All the other business-critical infrastructure is accessed through this bastion host. Organizations instead designate a hardened intermediary server (or jump server) that is the only one open for external ssh access. But exposing these servers for public access also exposes them to attacks. Remote access to databases and other servers is often required for administrative chores and troubleshooting. From a security perspective, a Bastion host is the only node in the network exposed for external access. A Bastion Host (or a jump server) is a dedicated computer used to access infrastructure resources and helps compartmentalize them.
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