2017-11-01 11:56:40 -04:00
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# GitLab and SSH keys
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2014-04-24 18:48:22 -04:00
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2016-09-28 09:45:28 -04:00
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Git is a distributed version control system, which means you can work locally
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but you can also share or "push" your changes to other servers.
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Before you can push your changes to a GitLab server
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you need a secure communication channel for sharing information.
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The SSH protocol provides this security and allows you to authenticate to the
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GitLab remote server without supplying your username or password each time.
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For a more detailed explanation of how the SSH protocol works, read
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[this nice tutorial by DigitalOcean](https://www.digitalocean.com/community/tutorials/understanding-the-ssh-encryption-and-connection-process).
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## Requirements
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The only requirement is to have the OpenSSH client installed on your system. This
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comes pre-installed on GNU/Linux and macOS, but not on Windows.
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2018-08-03 06:14:29 -04:00
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Depending on your Windows version, there are different methods to work with
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SSH keys.
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2018-08-03 06:14:29 -04:00
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### Installing the SSH client for Windows 10
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2016-12-09 06:49:07 -05:00
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2018-08-03 06:14:29 -04:00
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Starting with Windows 10, you can
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[install the Windows Subsystem for Linux (WSL)](https://docs.microsoft.com/en-us/windows/wsl/install-win10)
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where you can run Linux distributions directly on Windows, without the overhead
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of a virtual machine. Once installed and set up, you'll have the Git and SSH
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clients at your disposal.
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2016-12-09 06:49:07 -05:00
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2018-08-03 06:14:29 -04:00
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### Installing the SSH client for Windows 8.1 and Windows 7
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The easiest way to install Git and the SSH client on Windows 8.1 and Windows 7
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is [Git for Windows](https://gitforwindows.com). It provides a BASH
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emulation (Git Bash) used for running Git from the command line and the
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`ssh-keygen` command that is useful to create SSH keys as you'll learn below.
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NOTE: **Alternative tools:**
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Although not explored in this page, you can use some alternative tools.
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[Cygwin](https://www.cygwin.com) is a large collection of GNU and open source
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tools which provide functionality similar to a Unix distribution.
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[PuttyGen](https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html)
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provides a graphical user interface to [create SSH keys](https://tartarus.org/~simon/putty-snapshots/htmldoc/Chapter8.html#pubkey-puttygen).
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## Types of SSH keys and which to choose
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GitLab supports RSA, DSA, ECDSA, and ED25519 keys. Their difference lies on
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the signing algorithm, and some of them have advantages over the others. For
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more information, you can read this
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[nice article on ArchWiki](https://wiki.archlinux.org/index.php/SSH_keys#Choosing_the_authentication_key_type).
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We'll focus on ED25519 and RSA and here.
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NOTE: **Note:**
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As an admin, you can restrict
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[which keys should be permitted and their minimum length](../security/ssh_keys_restrictions.md).
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By default, all keys are permitted, which is also the case for
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[GitLab.com](../user/gitlab_com/index.md#ssh-host-keys-fingerprints).
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2018-08-03 06:14:29 -04:00
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## ED25519 SSH keys
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Following [best practices](https://linux-audit.com/using-ed25519-openssh-keys-instead-of-dsa-rsa-ecdsa/),
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you should always favor [ED25519](https://ed25519.cr.yp.to/) SSH keys, since they
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are more secure and have better performance over the other types.
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2018-08-03 06:14:29 -04:00
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They were introduced in OpenSSH 6.5, so any modern OS should include the
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option to create them. If for any reason your OS or the GitLab instance you
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interact with doesn't support this, you can fallback to RSA.
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## RSA SSH keys
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RSA keys are the most common ones and therefore the most compatible with
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servers that may have an old OpenSSH version. Use them if the GitLab server
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doesn't work with ED25519 keys.
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The minimum key size is 1024 bits, defaulting to 2048. If you wish to generate a
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stronger RSA key pair, specify the `-b` flag with a higher bit value than the
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default.
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The old, default password encoding for SSH private keys keys is
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[insecure](https://latacora.singles/2018/08/03/the-default-openssh.html);
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it's only a single round of an MD5 hash. Since OpenSSH version 6.5, you should
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use the `-o` option to `ssh-keygen` to encode your private key in a new, more
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secure format.
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If you already have an RSA SSH key pair to use with GitLab, consider upgrading it
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to use the more secure password encryption format by using the following command
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on the private key:
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```bash
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ssh-keygen -o -f ~/.ssh/id_rsa
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```
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2017-03-02 05:22:40 -05:00
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2016-09-28 09:45:28 -04:00
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## Generating a new SSH key pair
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Before creating an SSH key pair, make sure to read about the
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[different types of keys](#types-of-ssh-keys-and-which-to-choose) to understand
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their differences.
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To create a new SSH key pair:
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1. Open a terminal on Linux or macOS, or Git Bash / WSL on Windows.
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1. Generate a new ED25519 SSH key pair:
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2016-12-09 06:49:07 -05:00
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```bash
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ssh-keygen -t ed25519 -C "email@example.com"
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```
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2016-05-24 23:42:22 -04:00
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2018-08-03 06:14:29 -04:00
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Or, if you want to use RSA:
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2018-08-03 06:14:29 -04:00
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```bash
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ssh-keygen -o -t rsa -b 4096 -C "email@example.com"
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```
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The `-C` flag adds a comment in the key in case you have multiple of them
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and want to tell which is which. It is optional.
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1. Next, you will be prompted to input a file path to save your SSH key pair to.
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If you don't already have an SSH key pair, use the suggested path by pressing
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<kbd>Enter</kbd>. Using the suggested path will normally allow your SSH client
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to automatically use the SSH key pair with no additional configuration.
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2018-08-03 06:14:29 -04:00
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If you already have an SSH key pair with the suggested file path, you will need
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to input a new file path and [declare what host](#working-with-non-default-ssh-key-pair-paths)
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this SSH key pair will be used for in your `~/.ssh/config` file.
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2018-08-03 06:14:29 -04:00
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1. Once the path is decided, you will be prompted to input a password to
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secure your new SSH key pair. It's a best practice to use a password,
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but it's not required and you can skip creating it by pressing
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<kbd>Enter</kbd> twice.
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2018-08-03 06:14:29 -04:00
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If, in any case, you want to add or change the password of your SSH key pair,
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you can use the `-p`flag:
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2018-08-03 06:14:29 -04:00
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```
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ssh-keygen -p -o -f <keyname>
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```
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2018-08-03 06:14:29 -04:00
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Now, it's time to add the newly created public key to your GitLab account.
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2018-08-03 06:14:29 -04:00
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## Adding an SSH key to your GitLab account
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1. Copy your **public** SSH key to the clipboard by using one of the commands below
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depending on your Operating System:
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2016-12-09 06:49:07 -05:00
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**macOS:**
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2016-12-09 06:49:07 -05:00
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```bash
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pbcopy < ~/.ssh/id_ed25519.pub
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```
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**WSL / GNU/Linux (requires the xclip package):**
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```bash
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xclip -sel clip < ~/.ssh/id_ed25519.pub
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```
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**Git Bash on Windows:**
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```bash
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cat ~/.ssh/id_ed25519.pub | clip
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```
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2018-08-03 06:14:29 -04:00
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You can also open the key in a graphical editor and copy it from there,
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but be careful not to accidentally change anything.
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NOTE: **Note:**
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If you opted to create an RSA key, the name might differ.
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2018-08-03 06:14:29 -04:00
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1. Add your public SSH key to your GitLab account by clicking your avatar
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in the upper right corner and selecting **Settings**. From there on,
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navigate to **SSH Keys** and paste your public key in the "Key" section.
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If you created the key with a comment, this will appear under "Title".
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If not, give your key an identifiable title like _Work Laptop_ or
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_Home Workstation_, and click **Add key**.
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2018-08-03 06:14:29 -04:00
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NOTE: **Note:**
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If you manually copied your public SSH key make sure you copied the entire
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key starting with `ssh-ed25519` (or `ssh-rsa`) and ending with your email.
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## Testing that everything is set up correctly
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To test whether your SSH key was added correctly, run the following command in
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your terminal (replacing `gitlab.com` with your GitLab's instance domain):
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2018-08-03 06:14:29 -04:00
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```bash
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ssh -T git@gitlab.com
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```
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You should receive a _Welcome to GitLab, `@username`!_ message.
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If the welcome message doesn't appear, run SSH's verbose mode by replacing `-T`
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with `-vvvT` to understand where the error is.
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## Working with non-default SSH key pair paths
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If you used a non-default file path for your GitLab SSH key pair,
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you must configure your SSH client to find your GitLab private SSH key
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for connections to GitLab.
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Open a terminal and use the following commands
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(replacing `other_id_rsa` with your private SSH key):
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2017-03-02 05:22:40 -05:00
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```bash
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eval $(ssh-agent -s)
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ssh-add ~/.ssh/other_id_rsa
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```
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To retain these settings, you'll need to save them to a configuration file.
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For OpenSSH clients this is configured in the `~/.ssh/config` file. In this
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file you can set up configurations for multiple hosts, like GitLab.com, your
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own GitLab instance, GitHub, Bitbucket, etc.
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2017-03-02 05:22:40 -05:00
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Below are two example host configurations using their own SSH key:
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2018-08-03 06:14:29 -04:00
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```conf
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# GitLab.com
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Host gitlab.com
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Preferredauthentications publickey
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IdentityFile ~/.ssh/gitlab_com_rsa
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2018-08-03 06:14:29 -04:00
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# Private GitLab instance
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Host gitlab.company.com
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Preferredauthentications publickey
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IdentityFile ~/.ssh/example_com_rsa
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```
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Public SSH keys need to be unique to GitLab, as they will bind to your account.
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Your SSH key is the only identifier you'll have when pushing code via SSH,
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that's why it needs to uniquely map to a single user.
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## Deploy keys
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### Per-repository deploy keys
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Deploy keys allow read-only or read-write (if enabled) access to one or
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multiple projects with a single SSH key pair.
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This is really useful for cloning repositories to your Continuous
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Integration (CI) server. By using deploy keys, you don't have to set up a
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dummy user account.
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If you are a project maintainer or owner, you can add a deploy key in the
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project settings under the section 'Repository'. Specify a title for the new
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deploy key and paste a public SSH key. After this, the machine that uses
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the corresponding private SSH key has read-only or read-write (if enabled)
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access to the project.
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You can't add the same deploy key twice using the form.
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If you want to add the same key to another project, please enable it in the
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list that says 'Deploy keys from projects available to you'. All the deploy
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keys of all the projects you have access to are available. This project
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access can happen through being a direct member of the project, or through
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a group.
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Deploy keys can be shared between projects, you just need to add them to each
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project.
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2018-03-05 06:44:42 -05:00
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### Global shared deploy keys
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2018-08-03 22:44:52 -04:00
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Global Shared Deploy keys allow read-only or read-write (if enabled) access to
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be configured on any repository in the entire GitLab installation.
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This is really useful for integrating repositories to secured, shared Continuous
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Integration (CI) services or other shared services.
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GitLab administrators can set up the Global Shared Deploy key in GitLab and
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add the private key to any shared systems. Individual repositories opt into
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exposing their repository using these keys when a project maintainers (or higher)
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authorizes a Global Shared Deploy key to be used with their project.
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2018-03-05 06:44:42 -05:00
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Global Shared Keys can provide greater security compared to Per-Project Deploy
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Keys since an administrator of the target integrated system is the only one
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who needs to know and configure the private key.
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GitLab administrators set up Global Deploy keys in the Admin area under the
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|
section **Deploy Keys**. Ensure keys have a meaningful title as that will be
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2018-05-25 02:18:42 -04:00
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the primary way for project maintainers and owners to identify the correct Global
|
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Deploy key to add. For instance, if the key gives access to a SaaS CI instance,
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|
use the name of that service in the key name if that is all it is used for.
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|
When creating Global Shared Deploy keys, give some thought to the granularity
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2018-08-03 22:44:52 -04:00
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|
of keys - they could be of very narrow usage such as just a specific service or
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|
of broader usage for something like "Anywhere you need to give read access to
|
2018-03-05 06:44:42 -05:00
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|
your repository".
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|
2018-08-03 22:44:52 -04:00
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Once a GitLab administrator adds the Global Deployment key, project maintainers
|
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|
and owners can add it in project's **Settings > Repository** section by expanding the
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|
|
**Deploy Key** section and clicking **Enable** next to the appropriate key listed
|
2018-03-05 06:44:42 -05:00
|
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|
under **Public deploy keys available to any project**.
|
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|
NOTE: **Note:**
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|
The heading **Public deploy keys available to any project** only appears
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|
if there is at least one Global Deploy Key configured.
|
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|
CAUTION: **Warning:**
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|
|
Defining Global Deploy Keys does not expose any given repository via
|
2018-04-27 04:50:05 -04:00
|
|
|
the key until that repository adds the Global Deploy Key to their project.
|
2018-03-05 06:44:42 -05:00
|
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|
In this way the Global Deploy Keys enable access by other systems, but do
|
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|
not implicitly give any access just by setting them up.
|
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|
|
|
2015-04-14 18:31:26 -04:00
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|
|
## Applications
|
|
|
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|
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|
|
### Eclipse
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|
|
2017-03-02 05:22:40 -05:00
|
|
|
How to add your SSH key to Eclipse: https://wiki.eclipse.org/EGit/User_Guide#Eclipse_SSH_Configuration
|
2016-12-09 06:49:07 -05:00
|
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|
|
2017-08-30 07:00:39 -04:00
|
|
|
## SSH on the GitLab server
|
|
|
|
|
|
|
|
GitLab integrates with the system-installed SSH daemon, designating a user
|
|
|
|
(typically named `git`) through which all access requests are handled. Users
|
|
|
|
connecting to the GitLab server over SSH are identified by their SSH key instead
|
|
|
|
of their username.
|
|
|
|
|
|
|
|
SSH *client* operations performed on the GitLab server wil be executed as this
|
|
|
|
user. Although it is possible to modify the SSH configuration for this user to,
|
|
|
|
e.g., provide a private SSH key to authenticate these requests by, this practice
|
|
|
|
is **not supported** and is strongly discouraged as it presents significant
|
|
|
|
security risks.
|
|
|
|
|
|
|
|
The GitLab check process includes a check for this condition, and will direct you
|
|
|
|
to this section if your server is configured like this, e.g.:
|
|
|
|
|
|
|
|
```
|
|
|
|
$ gitlab-rake gitlab:check
|
|
|
|
# ...
|
|
|
|
Git user has default SSH configuration? ... no
|
|
|
|
Try fixing it:
|
|
|
|
mkdir ~/gitlab-check-backup-1504540051
|
|
|
|
sudo mv /var/lib/git/.ssh/id_rsa ~/gitlab-check-backup-1504540051
|
|
|
|
sudo mv /var/lib/git/.ssh/id_rsa.pub ~/gitlab-check-backup-1504540051
|
|
|
|
For more information see:
|
|
|
|
doc/ssh/README.md in section "SSH on the GitLab server"
|
|
|
|
Please fix the error above and rerun the checks.
|
|
|
|
```
|
|
|
|
|
|
|
|
Remove the custom configuration as soon as you're able to. These customizations
|
|
|
|
are *explicitly not supported* and may stop working at any time.
|
|
|
|
|
2017-03-02 05:22:40 -05:00
|
|
|
## Troubleshooting
|
|
|
|
|
|
|
|
If on Git clone you are prompted for a password like `git@gitlab.com's password:`
|
|
|
|
something is wrong with your SSH setup.
|
|
|
|
|
|
|
|
- Ensure that you generated your SSH key pair correctly and added the public SSH
|
|
|
|
key to your GitLab profile
|
2017-11-01 11:56:40 -04:00
|
|
|
- Try manually registering your private SSH key using `ssh-agent` as documented
|
2017-03-02 05:22:40 -05:00
|
|
|
earlier in this document
|
|
|
|
- Try to debug the connection by running `ssh -Tv git@example.com`
|
|
|
|
(replacing `example.com` with your GitLab domain)
|