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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.
Mar 31, 2017 In this Recreate a lost Private Key process what I did have I created a new public-private key pair by generating one locally then uploading the key pair to AWS. In that way when I create a new EC2 instance I can assign the key pair I just created and access the boxes via SSH. To create a key pair. Command: aws ec2 create-key-pair -key-name MyKeyPair. The output is an ASCII version of the private key and key fingerprint. You need to save the key to a file. For more information, see Using Key Pairs in the AWS Command Line Interface User Guide. If you don't already have an SSH key, you must generate a new SSH key.If you're unsure whether you already have an SSH key, check for existing keys. If you don't want to reenter your passphrase every time you use your SSH key, you can add your key to the SSH agent, which manages your SSH keys and remembers your passphrase. Registering an IAM User's Public SSH Key Create an SSH key pair. The simplest approach is to generate the key pair locally. Sign into the AWS OpsWorks Stacks console as an IAM user with self-management enabled. Select My Settings, which displays the settings for the signed-in IAM user. Save the text file in the same folder where you saved the private key, using the.pub extension to indicate that the file contains a public key. If you or others are going to use an SSH client that requires the OpenSSH format for private keys (such as the ssh utility on Linux), export the private key: On the Conversions menu, choose Export.
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Generate New Ssh Key Aws Login
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:
Aws Create Ssh Key Pair
- 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:
This Automation document uses the EC2Rescue for Linux tool on the specified EC2 instance to automatically generate and add a new SSH (Public/Private) key pair. The new SSH private key for your instance is encrypted and saved in the Parameter Store. The parameter name is /ec2rl/openssh/instanceid/key.
(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.
Generate New Ssh Key Mac
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.