This document will show you how to generate a personal SSH key pair and upload the public key to RightScale for use with Server Login Control. If using a personal key pair, users can easily SSH to cloud instances without going through the RightScale Dashboard.Rather than creating a cloud-specific or RightScale-specific key pair, users can continue to use their preexisting, personal key pair.Private keys are never shared between users.Public-key authorization can be used even in clouds that do not natively support SSH public-key authentication.The server grants and revokes trust in real time as a user's server_login privileges are granted and revoked.When compared to the traditional technique of binding a single, shared SSH key to the server at launch time, Server Login Control has the following advantages: Now since you gave the server the public key (=piggy bank), it can encrypt something (say a random number), send it back and only you can decrypt this number, since only you have the private key.įor more detailed information on how this works, head over to the References.Servers that support Server Login Control populate their SSH authorized-keys file with multiple trusted keys based on policy received from the RightScale Dashboard, typically inserting one public key per user with server_login permission. In this way you can distribute all the piggy banks you like and if someone put something in there and sends it back, only you can open it with your private key. A public key is like an indestructible piggy bank: Everybody can put something (data) into it, but nobody can get it back out again. The basic principle is that of asymmetrical cryptography being employed by using a public-private-key-pair. You should also make sure, that correct file access permission are set. If the key of your local machine is not contained in the authorized_keys on the server, repeat the steps of copying the key to the server. In that case you should check, whether the authorized_keys file really contains the key by executing: If it still asks for your password, something went wrong. Regardless of the method used, the next time you ssh to the server, it should use the key and instead of prompting for the user's pass word, prompt for the pass phrase of the key (if you chose to employ one). You will be prompted for your password and the program will manage the rest. $ ssh-copy-id is your username on the remote host. Instead of performing the copying of the ssh key to the server manually, you can use the program ssh-copy-id to achieve the same goal: ssh directory beforehand if it does not exist): vim) to paste the key into the file (creating the. This can be done, by opening an ssh connection via password and then using an editor (e.g. This public key now has to be copied to the server into the ~/.ssh/authorized_keys file. With the files id_rsa being your private and id_rsa.pub being your public key.Ĭopy the public key to the server Method A If you did not specify a different file, the key normaly gets generated into the folder (Your key is basically just a file sitting on your computer and a passphrase protects your key, if someone happens to steal/copy that file). You can then optionally protect your key with a passphrase. Where you can specify the max length of the key up to 16384 bits. You should start by generating a key pair: Someone could intercept your password, since it has to be send to the server at some point in some form.Someone could bruteforce or guess your password, since many passwords are commonly weak or used for multiple applications.When you connect to a server, authenticating via a password there are two main problems:
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