![]() ![]() For my setup, I have picked the default SSE-S3 (AES-256) encryptionĬloudWatch logs are encrypted with KMS and a Customer Master Keyįor completeness, I include an encrypted S3 bucket example written in CloudFormation:Īws ssm start-session -target instance-id Single manipulation executed in the terminal, including its output) both on S3 and/or CloudWatch.įurthermore, both for S3 and CloudWatch, there’s the option to enable encryption, which I would On top of that, AWS Session Manager offers the ability to store all session data (literally every Also, CloudTrail keeps track of all API Calls Session is easy to trace back to a specific person. In contrast to plain old SSH access where key pairs are often shared (although that shouldn’t be theĬase), a session initiated with AWS Session Manager is bound to a single IAM user. When it comes to logging and auditing, it’s where AWS Session Manager really You’re all set: meaning that you can create a secure shell connection from the CLI, the WebĬonsole, or even set up an SSH session tunnelled through Session Manager.To allow instance access to Session Manager. The next step is to tweak your EC2 instance.That’s because SSM Agent is preinstalled, by default on Amazon Linux and a bunch of Given that Amazon Linux 2 is our preferred OS, it was easy to enable AWS Session Manager in ourĮnvironment. Shell access mainly because it’s the most secure pick out of the three, and it’s simple to set Given all the above, we decided to go for AWS Session Manager as our preferred solution for secure Logging and auditing capabilities are provided through integration CloudWatch, CloudTrail, and S3įurthermore, it supports both terminal access through the Amazon webĪlthough with the last option, you might lose some benefits (more on that later).One-click access to instances from the console and CLI.Cross-platform support for both Windows and Linux.Centralized access control to instances using IAM policies.VPCĮndpoints to Systems Manager are all that is required Instances in private subnets can be connected to, even without a NAT gateway present.No open inbound ports and no need to manage bastion hosts or SSH keys, no public IP.The main benefits of Session Manager are: ![]() The last option to scrutinize is AWS SSM SessionĪnother AWS service to obtain secure shell access. Option 3: AWS Systems Manager Session Manager Linux 2 or Ubuntu (16.04 or later) are supported, and Windows support is completely left out. Furthermore, it offers limited OS support. This also means it’s not an option for instances On top of these advantages,ĮC2 Connect is simple to use and offers an ‘out of the box’ solution that does not require extraĮC2 Instance Connect, however, does not answer some of my main security concerns: both a public IPĪnd an open port to the world are still required. When compared to vanilla SSH, Instance Connect adds some nice security enhancements (CentralizedĪccess control, Short-lived keys, Auditability and Ubiquitous access). I consider EC2 Instance Connect as the new kid on the Even correctly set up today, somebody could easily overwrite your hardened settings Whenever possible I try to avoid exposing an SSH service to It’s the best-known option butĪlso the one which is most under attack. Pitfall to avoid is an insecure setup that allows root login, text password, etc. I won’t detail this option because I assume most of you are already familiar with it. So let’s jump into the details of every option. Like to find out each option’s advantages and disadvantages. In this regard: my main quest is to find the most secure option. What are the options?īefore diving deeper into the topic let’s go over the available options for Secure Shell access onĪWS first. Secure Access without opening any extra ports. Picking the best way for secure shell access to an AWS EC2 instance by offering a solution to enable So whenever I can avoid opening an inbound port, I’ll prefer that solution. The problem I have with opening inbound ports on security groups is that this always involves risks. SSH) or 3389 (for RDP) on your remote host (if you use the standard ports). Technically this means that you need to allow inbound traffic on port 22 (for ![]() Way to get remote shell access on Linux is through SSH (while its Window’s counterpart relies on RDPįor that purpose). Into an instance to try something out or to do some troubleshooting. Although I’m a firm believer in Immutable Infrastructure, sometimes it’s just handy to quickly log ![]()
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