120 lines
5.7 KiB
Markdown
120 lines
5.7 KiB
Markdown
---
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type: reference, howto
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---
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# Vault Authentication with GitLab OpenID Connect
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> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/issues/22323) in GitLab 9.0
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[Vault](https://www.vaultproject.io/) is a secrets management application offered by HashiCorp.
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It allows you to store and manage sensitive information such as secret environment variables, encryption keys, and authentication tokens.
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Vault offers Identity-based Access, which means Vault users can authenticate through several of their preferred cloud providers.
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In this document, we'll explain how Vault users can authenticate themselves through GitLab by utilizing our OpenID authentication feature.
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The following assumes you already have Vault installed and running.
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1. **Get the OpenID Connect client ID and secret from GitLab:**
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First you'll need to create a GitLab application to obtain an application ID and secret for authenticating into Vault. To do this, sign in to GitLab and follow these steps:
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1. On GitLab, click your avatar on the top-right corner, and select your user **Settings > Applications**.
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1. Fill out the application **Name** and [**Redirect URI**](https://www.vaultproject.io/docs/auth/jwt.html#redirect-uris),
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making sure to select the **OpenID** scope.
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1. Save application.
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1. Copy client ID and secret, or keep the page open for reference.
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1. **Enable OIDC auth on Vault:**
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OpenID Connect is not enabled in Vault by default. This needs to be enabled in the terminal.
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Open a terminal session and run the following command to enable the OpenID Connect authentication provider in Vault:
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```shell
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vault auth enable oidc
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```
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You should see the following output in the terminal:
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```shell
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Success! Enabled oidc auth method at: oidc/
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```
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1. **Write the OIDC config:**
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Next, Vault needs to be given the application ID and secret generated by GitLab.
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In the terminal session, run the following command to give Vault access to the GitLab application you've just created with an OpenID scope. This allows Vault to authenticate through GitLab.
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Replace `your_application_id` and `your_secret` in the example below with the application ID and secret generated for your app:
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```shell
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$ vault write auth/oidc/config \
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oidc_discovery_url="https://gitlab.com" \
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oidc_client_id="your_application_id" \
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oidc_client_secret="your_secret" \
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default_role="demo" \
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bound_issuer="localhost"
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```
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You should see the following output in the terminal:
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```shell
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Success! Data written to: auth/oidc/config
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```
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1. **Write the OIDC Role Config:**
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Now that Vault has a GitLab application ID and secret, it needs to know the [**Redirect URIs**](https://www.vaultproject.io/docs/auth/jwt.html#redirect-uris) and scopes given to GitLab during the application creation process. The redirect URIs need to match where your Vault instance is running. The `oidc_scopes` field needs to include the `openid`. Similarly to the previous step, replace `your_application_id` with the generated application ID from GitLab:
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This configuration is saved under the name of the role you are creating. In this case, we are creating a `demo` role. Later, we'll show how you can access this role through the Vault CLI.
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```shell
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vault write auth/oidc/role/demo \
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user_claim="sub" \
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allowed_redirect_uris="http://localhost:8250/oidc/callback,http://127.0.0.1:8200/ui/vault/auth/oidc/oidc/callback" \
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bound_audiences="your_application_id" \
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role_type="oidc" \
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oidc_scopes="openid" \
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policies=demo \
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ttl=1h
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```
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1. **Sign in to Vault:**
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1. Go to your Vault UI (example: [http://127.0.0.1:8200/ui/vault/auth?with=oidc](http://127.0.0.1:8200/ui/vault/auth?with=oidc)).
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1. If the `OIDC` method is not currently selected, open the dropdown and select it.
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1. Click the **Sign in With GitLab** button, which will open a modal window:
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1. Click **Authorize** on the modal to allow Vault to sign in through GitLab. This will redirect you back to your Vault UI as a signed-in user.
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1. **Sign in using the Vault CLI** (optional):
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Vault also allows you to sign in via their CLI.
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After writing the same configurations from above, you can run the command below in your terminal to sign in with the role configuration created in step 4 above:
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```shell
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vault login -method=oidc port=8250 role=demo
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```
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Here is a short explaination of what this command does:
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1. In the **Write the OIDC Role Config** (step 4), we created a role called `demo`. We set `role=demo` so Vault knows which configuration we'd like to login in with.
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1. To set Vault to use the `OIDC` sign-in method, we set `-method=oidc`.
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1. To set the port that GitLab should redirect to, we set `port=8250` or another port number that matches the port given to GitLab when listing [Redirect URIs](https://www.vaultproject.io/docs/auth/jwt.html#redirect-uris).
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Once you run the command above, it will present a link in the terminal.
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Click the link in the terminal and a tab will open in the browser confirming you're signed into Vault via OIDC:
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The terminal will output:
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```
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Success! You are now authenticated. The token information displayed below
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is already stored in the token helper. You do NOT need to run "vault login"
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again. Future Vault requests will automatically use this token.
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```
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