Security can be easily overlooked when building a product, especially when working with an outsourced engineering team. You want to trust them, so you give them access to your servers. But then you discover fraudulent activity, and, well, you start to panic.
- For creating New Pem key: Go to EC2 Dashboard Key Pair Create Key Pair. This will download pem key file for you. For SSH access: You can add your idrsa.pub to instance /.ssh/auth. file. After that, you can ssh to it by using ssh ubuntu@ip; You can use the pem key which is associated with that instance by using ssh -i 'file.pem' ubuntu@ip.
- Step 1: Create a new key pair. Create a new key pair using either the Amazon EC2 console or a third-party tool. If you want to name your new key pair exactly the same as the lost private key, you must first delete the existing key pair.
- If you create the key via the ec2 console, AWS will keep the public key in the system automatically and your browser will download the private key. See Creating a Key Pair Using Amazon EC2. (this second approach will save you having to upload it to ec2 keypairs). This method also works with the awskeypair resource, however you'll have to.
- Apr 10, 2020 When the key pair is created, use new console, old console, AWS CLI or PowerShell to import the keys to Amazon AWS. Go to Amazon EC2 to access the Amazon EC2 console and import the just created keys. Just like with creating a key pair, choose key pairs but instead of creating a new key pair, select import key pairs.
In hindsight, you realize you never should have shared your Secure Shell (SSH) key, instead storing it in a vault with restricted user access. If, however, someone has a private SSH key to your Amazon Web Services (AWS) Elastic Compute Cloud (EC2) instance and you’re worried about a malicious attack, you have two options to revoke their access:
Start new t1.micro EC2 instance, using new key pair. Make sure you create it in the same subnet, otherwise you will have to terminate the instance and create it again. SSH to the new micro instance and copy content of /.ssh/authorizedkeys somewhere on your computer. Jul 15, 2014 This article will discuss EC2 key pairs and how they can be used to connect to Windows and Linux instances. Amazon AWS uses keys to encrypt and decrypt login information. At the basic level, a sender uses a public key to encrypt data, which its receiver then decrypts using another private key. These two keys.
- Create a new key-pair in the AWS console and boot up a new instance (assuming the attacker is removed from IAM users). This requires configuring the instance, which can be time-consuming — especially when you have several of them.
- Replace the public key in ~/.ssh/authorized_keys on your existing instance so the attacker can no longer unlock it with their private key.
Here’s a summary of how to replace the keys mentioned in option No. 2 above:
Ec2 Generate New Key Pair Code
(For more, DigitalOcean has a great tutorial on setting up SSH keys.)
- On your local machine in the terminal, generate a new key pair:
ssh-keygen -t rsa
- When prompted to save the file, hit Enter for the default location or choose your own path.
- When prompted for a passphrase, you can leave the field empty. Although it does not hurt to have more security, if the key pair is used elsewhere for CI or automation, you will need to leave the passphrase empty — machines cannot guess passphrases.
- Copy the public key you just saved on your machine to your EC2 authorized keys file:
cat ~/.ssh/id_rsa.pub | ssh [email protected] 'mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys
where ~/.ssh/id_rsa.pub is the new key on your machine and [email protected] is the username and IP address of your EC2 instance. - At this point, your new public key should be on your EC2 instance in the authorized_keys file, and all you have to do is remove the old one. Make sure you can SSH into your EC2 instance with the new key first.
- Once you’re in, you can remove the old key using
vim ~/.ssh/authorized_keys
Just go to the line with the old key and remove it:dd
Note: If you tried editing the file and didn’t save it, or the connection was interrupted, an .authorized_keys.swp file will be created, and the next time you try to edit your authorized_keys, you will get a nasty message. Just delete the .swp file, and you should be good to edit. - Save the file.
Ec2 Generate New Key Pair Key
Make sure to update the key if you’re using it elsewhere, like on a continuous integration (CI) server. Otherwise you’ll be scratching your head when none of your builds are working.