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Add docs for K8s auth method

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Tuan Dang
2024-05-14 18:02:05 -07:00
parent 2b91ec5ae9
commit 0d89aa8607
8 changed files with 245 additions and 8 deletions
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8
backend/src/services/identity-kubernetes-auth/identity-kubernetes-auth-service.ts
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@@ -115,9 +115,11 @@ export const identityKubernetesAuthServiceFactory = ({
"Content-Type": "application/json",
Authorization: `Bearer ${tokenReviewerJwt}`
},
httpsAgent: new https.Agent({
ca: caCert,
rejectUnauthorized: false // TODO: change to [true]
...(caCert && {
httpsAgent: new https.Agent({
ca: caCert,
rejectUnauthorized: true
})
})
}
);

2
docs/documentation/platform/identities/aws-auth.mdx
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@@ -39,7 +39,7 @@ then Infisical returns a short-lived access token that can be used to make authe
To be more specific:
1. The client IAM principal signs a `GetCallerIdentity` query using the [AWS Signature v4 algorithm](https://docs.aws.amazon.com/IAM/latest/UserGuide/create-signed-request.html); this is done using the credentials from the AWS environment where the IAM principal is running.
2. The client sends the signed query data to Infisical including the request method, request body, and request headers.
2. The client sends the signed query data to Infisical including the request method, request body, and request headers at the `/api/v1/auth/aws-auth/login` endpoint.
3. Infisical reconstructs the query and sends it to AWS STS API via the [sts:GetCallerIdentity](https://docs.aws.amazon.com/STS/latest/APIReference/API_GetCallerIdentity.html) method for verification and obtains the identity associated with the IAM principal.
4. Infisical checks the identity's properties against set criteria such **Allowed Principal ARNs**.
5. If all is well, Infisical returns a short-lived access token that the IAM principal can use to make authenticated requests to the Infisical API.

4
docs/documentation/platform/identities/gcp-auth.mdx
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@@ -46,7 +46,7 @@ then Infisical returns a short-lived access token that can be used to make authe
To be more specific:
1. The client running on a GCP service obtains an [ID token](https://cloud.google.com/docs/authentication/get-id-token) constituting the identity for a GCP resource such as a GCE instance or Cloud Function; this is a unique JWT token that includes details about the instance as well as Google's [RS256 signature](https://datatracker.ietf.org/doc/html/rfc7518#section-3.3).
2. The client sends the ID token to Infisical.
2. The client sends the ID token to Infisical at the `/api/v1/auth/gcp-auth/login` endpoint.
3. Infisical verifies the token against Google's [public OAuth2 certificates](https://www.googleapis.com/oauth2/v3/certs).
4. Infisical checks if the entity behind the ID token is allowed to authenticate with Infisical based on set criteria such as **Allowed Service Account Emails**.
5. If all is well, Infisical returns a short-lived access token that the client can use to make authenticated requests to the Infisical API.
@@ -208,7 +208,7 @@ then Infisical returns a short-lived access token that can be used to make authe
To be more specific:
1. The client generates a signed JWT token using the `projects.serviceAccounts.signJwt` [API method](https://cloud.google.com/iam/docs/reference/credentials/rest/v1/projects.serviceAccounts/signJwt); this is done using the service account credentials associated with the client.
2. The client sends the signed JWT token to Infisical.
2. The client sends the signed JWT token to Infisical at the `/api/v1/auth/gcp-auth/login` endpoint.
3. Infisical verifies the signed JWT token.
4. Infisical checks if the service account behind the JWT token is allowed to authenticate with Infisical based **Allowed Service Account Emails**.
5. If all is well, Infisical returns a short-lived access token that the client can use to make authenticated requests to the Infisical API.

233
docs/documentation/platform/identities/kubernetes-auth.mdx Normal file
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@@ -0,0 +1,233 @@
---
title: Kubernetes Auth
description: "Learn how to authenticate with Infisical in Kubernetes"
---
**Kubernetes Auth** is a Kubernetes-native authentication method for applications (e.g. pods) to access Infisical.
## Diagram
The following sequence digram illustrates the Kubernetes Auth workflow for authenticating applications running in pods with Infisical.
```mermaid
sequenceDiagram
participant Pod as Pod
participant Infis as Infisical
participant KubernetesServer as K8s API Server
Note over Pod: Step 1: Service Account JWT Token Retrieval
Note over Pod,Infis: Step 2: JWT Token Login Operation
Pod->>Infis: Send JWT token to /api/v1/auth/kubernetes-auth/login
Infis->>KubernetesServer: Forward JWT token for validation
KubernetesServer-->>Infis: Return identity info for JWT
Note over Infis: Step 3: Identity Property Verification
Infis->>Pod: Return short-lived access token
Note over Pod,Infis: Step 4: Access Infisical API with Token
Pod->>Infis: Make authenticated requests using the short-lived access token
```
## Concept
At a high-level, Infisical authenticates an application in Kubernetes by verifying its identity and checking that it meets specific requirements (e.g. it is bound to an allowed service account) at the `/api/v1/auth/kubernetes-auth/login` endpoint. If successful,
then Infisical returns a short-lived access token that can be used to make authenticated requests to the Infisical API.
To be more specific:
1. The application retrieves its [service account credential](https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/#opt-out-of-api-credential-automounting) that is a JWT token at the `/var/run/secrets/kubernetes.io/serviceaccount/token` pod path.
2. The application sends the JWT token to Infisical at the `/api/v1/auth/kubernetes-auth/login` endpoint after which Infisical forwards the JWT token to the Kubernetes API Server at the [TokenReview API](https://kubernetes.io/docs/reference/kubernetes-api/authentication-resources/token-review-v1/). Infisical is able to authenticate and interact with the TokenReview API by using a long-lived service account JWT token itself (referred to onward as the token reviewer JWT token).
3. Infisical checks the identity's properties against set criteria such **Allowed Service Account Names** and **Allowed Namespaces**.
4. If all is well, Infisical returns a short-lived access token that the application can use to make authenticated requests to the Infisical API.
<Note>
We recommend using one of Infisical's clients like SDKs or the Infisical Agent
to authenticate with Infisical using Kubernetes Auth as they handle the
authentication process including service account credential retrieval for you.
Also, note that Infisical needs access to send requests to the Kubernetes API Server
as part of the Kubernetes Auth workflow.
</Note>
## Guide
In the following steps, we explore how to create and use identities for your applications in Kubernetes to access the Infisical API using the Kubernetes Auth authentication method.
<Steps>
<Step title="Obtaining the token reviewer JWT for Infisical">
1.1. Start by creating a service account in your Kubernetes cluster that will be used by Infisical to authenticate with the Kubernetes API Server.
```bash
kubectl create serviceaccount infisical-auth -n default
```
1.2. Bind the service account to the `system:auth-delegator` cluster role. As described [here](https://kubernetes.io/docs/reference/access-authn-authz/rbac/#other-component-roles), this role allows delegated authentication and authorization checks, specifically for Infisical to access the [TokenReview API](https://kubernetes.io/docs/reference/kubernetes-api/authentication-resources/token-review-v1/). You can apply the following configuration file:
```yaml
apiVersion: [rbac.authorization.k8s.io/v1](http://rbac.authorization.k8s.io/v1)
kind: ClusterRoleBinding
metadata:
name: role-tokenreview-binding
namespace: default
roleRef:
apiGroup: [rbac.authorization.k8s.io](http://rbac.authorization.k8s.io/)
kind: ClusterRole
name: system:auth-delegator
subjects:
- kind: ServiceAccount
name: infisical-auth
namespace: default
```
1.3. Next, create a long-lived service account JWT token (i.e. the token reviewer JWT token) for the service account using this configuration file for a new `Secret` resource:
```yaml
apiVersion: v1
kind: Secret
metadata:
name: infisical-auth-token
annotations:
¦ kubernetes.io/service-account.name: "infisical-auth"
type: kubernetes.io/service-account-token
```
1.4. Link the secret in step 1.3 to the service account in step 1.1:
```bash
kubectl patch serviceaccount infisical-auth -p '{"secrets": [{"name": "infisical-auth-token"}]}' -n default
```
1.5. Finally, retrieve the token reviewer JWT token from the secret.
```bash
kubectl get secret infisical-auth-token -n default -o=jsonpath='{.data.token}' | base64 --decode
```
Keep this JWT token handy as you will need it for the **Token Reviewer JWT** field when configuring the Kubernetes Auth authentication method for the identity in step 2.
</Step>
<Step title="Creating an identity">
To create an identity, head to your Organization Settings > Access Control > Machine Identities and press **Create identity**.
![identities organization](/images/platform/identities/identities-org.png)
When creating an identity, you specify an organization level [role](/documentation/platform/role-based-access-controls) for it to assume; you can configure roles in Organization Settings > Access Control > Organization Roles.
![identities organization create](/images/platform/identities/identities-org-create.png)
Now input a few details for your new identity. Here's some guidance for each field:
- Name (required): A friendly name for the identity.
- Role (required): A role from the **Organization Roles** tab for the identity to assume. The organization role assigned will determine what organization level resources this identity can have access to.
Once you've created an identity, you'll be prompted to configure the authentication method for it. Here, select **Kubernetes Auth**.
![identities organization create auth method](/images/platform/identities/identities-org-create-kubernetes-auth-method.png)
Here's some more guidance on each field:
- Kubernetes Host / Base Kubernetes API URL: The host string, host:port pair, or URL to the base of the Kubernetes API server. This can usually be obtained by running `kubectl cluster-info`.
- Token Reviewer JWT: A long-lived service account JWT token for Infisical to access the [TokenReview API](https://kubernetes.io/docs/reference/kubernetes-api/authentication-resources/token-review-v1/) to validate other service account JWT tokens submitted by applications/pods. This is the JWT token obtained from step 1.5.
- Allowed Service Account Names: A comma-separated list of trusted service account names that are allowed to authenticate with Infisical.
- Allowed Namespaces: A comma-separated list of trusted namespaces that service accounts must belong to authenticate with Infisical.
- Allowed Audience: An optional audience claim that the service account JWT token must have to authenticate with Infisical.
- CA Certificate: The PEM-encoded CA cert for the Kubernetes API server. This is used by the TLS client for secure communication with the Kubernetes API server.
- Access Token TTL (default is `2592000` equivalent to 30 days): The lifetime for an acccess token in seconds. This value will be referenced at renewal time.
- Access Token Max TTL (default is `2592000` equivalent to 30 days): The maximum lifetime for an acccess token in seconds. This value will be referenced at renewal time.
- Access Token Max Number of Uses (default is `0`): The maximum number of times that an access token can be used; a value of `0` implies infinite number of uses.
- Access Token Trusted IPs: The IPs or CIDR ranges that access tokens can be used from. By default, each token is given the `0.0.0.0/0`, allowing usage from any network address.
</Step>
<Step title="Adding an identity to a project">
To enable the identity to access project-level resources such as secrets within a specific project, you should add it to that project.
To do this, head over to the project you want to add the identity to and go to Project Settings > Access Control > Machine Identities and press **Add identity**.
Next, select the identity you want to add to the project and the project level role you want to allow it to assume. The project role assigned will determine what project level resources this identity can have access to.
![identities project](/images/platform/identities/identities-project.png)
![identities project create](/images/platform/identities/identities-project-create.png)
</Step>
<Step title="Accessing the Infisical API with the identity">
To access the Infisical API as the identity, you should first make sure that the pod running your application is bound to a service account specified in the **Allowed Service Account Names** field of the identity's Kubernetes Auth authentication method configuration in step 2.
Once bound, the pod will receive automatically mounted service account credentials that is a JWT token at the `/var/run/secrets/kubernetes.io/serviceaccount/token` path. This token should be used to authenticate with Infisical at the `/api/v1/auth/kubernetes-auth/login` endpoint.
For information on how to configure sevice accounts for pods, refer to the guide [here](https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/).
We provide a code example below of how you might retrieve the JWT token and use it to authenticate with Infisical to gain access to the [Infisical API](/api-reference/overview/introduction).
<Accordion
title="Sample code for inside an application"
>
The shown example uses Node.js but you can use any other language to retrieve the service account JWT token and use it to authenticate with Infisical.
```javascript
const fs = require("fs");
try {
const tokenPath = "/var/run/secrets/kubernetes.io/serviceaccount/token";
const jwtToken = fs.readFileSync(tokenPath, "utf8");
const infisicalUrl = "https://app.infisical.com"; // or your self-hosted Infisical URL
const identityId = "<your-identity-id>";
const { data } = await axios.post(
`{infisicalUrl}/api/v1/auth/kubernetes-auth/login`,
{
identityId,
jwtToken,
}
);
console.log("result data: ", data); // access token here
} catch(err) {
console.error(err);
}
```
</Accordion>
<Tip>
We recommend using one of Infisical's clients like SDKs or the Infisical Agent to authenticate with Infisical using Kubernetes Auth as they handle the authentication process including service account credential retrieval for you.
</Tip>
<Note>
Each identity access token has a time-to-live (TLL) which you can infer from the response of the login operation;
the default TTL is `7200` seconds which can be adjusted.
If an identity access token expires, it can no longer authenticate with the Infisical API. In this case,
a new access token should be obtained by performing another login operation.
</Note>
</Step>
</Steps>
**FAQ**
<AccordionGroup>
<Accordion title="Why is the Infisical API rejecting my service account JWT token?">
There are a few reasons for why this might happen:
- The Kubernetes Auth authentication method configuration is invalid.
- The service account JWT token has expired is malformed or invalid.
- The service account associated with the JWT token does not meet the criteria set forth in the Kubernetes Auth authentication method configuration such as **Allowed Service Account Names** and **Allowed Namespaces**.
</Accordion>
<Accordion title="Why is the Infisical API rejecting my access token?">
There are a few reasons for why this might happen:
- The access token has expired.
- The identity is insufficently permissioned to interact with the resources you wish to access.
- The client access token is being used from an untrusted IP.
</Accordion>
<Accordion title="What is access token renewal and TTL/Max TTL?">
A identity access token can have a time-to-live (TTL) or incremental lifetime after which it expires.
In certain cases, you may want to extend the lifespan of an access token; to do so, you must set a max TTL parameter.
A token can be renewed any number of time and each call to renew it will extend the toke life by increments of access token TTL.
Regardless of how frequently an access token is renewed, its lifespan remains bound to the maximum TTL determined at its creation
</Accordion>
</AccordionGroup>

3
docs/documentation/platform/identities/machine-identities.mdx
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@@ -7,7 +7,7 @@ description: "Learn how to use Machine Identities to programmatically interact w
An Infisical machine identity is an entity that represents a workload or application that require access to various resources in Infisical. This is conceptually similar to an IAM user in AWS or service account in Google Cloud Platform (GCP).
Each identity must authenticate with the Infisical API using a supported authentication method like [Universal Auth](/documentation/platform/identities/universal-auth), [AWS Auth](/documentation/platform/identities/aws-auth), or [GCP Auth](/documentation/platform/identities/gcp-auth) to get back a short-lived access token to be used in subsequent requests.
Each identity must authenticate with the Infisical API using a supported authentication method like [Universal Auth](/documentation/platform/identities/universal-auth), [Kubernetes Auth](/documentation/platform/identities/kubernetes-auth), [AWS Auth](/documentation/platform/identities/aws-auth), or [GCP Auth](/documentation/platform/identities/gcp-auth) to get back a short-lived access token to be used in subsequent requests.
![organization identities](/images/platform/organization/organization-machine-identities.png)
@@ -38,6 +38,7 @@ Machine Identity support for the rest of the clients is planned to be released i
To interact with various resources in Infisical, Machine Identities are able to authenticate using:
- [Universal Auth](/documentation/platform/identities/universal-auth): A platform-agnostic authentication method that can be configured on an identity suitable to authenticate from any platform/environment.
- [Kubernetes Auth](/documentation/platform/identities/kubernetes-auth): A Kubernetes-native authentication method for applications (e.g. pods) to authenticate with Infisical.
- [AWS Auth](/documentation/platform/identities/aws-auth): An AWS-native authentication method for IAM principals like EC2 instances or Lambda functions to authenticate with Infisical.
- [GCP Auth](/documentation/platform/identities/gcp-auth): A GCP-native authentication method for GCP resources (e.g. Compute Engine, App Engine, Cloud Run, Google Kubernetes Engine, IAM service accounts, etc.) to authenticate with Infisical.

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docs/documentation/platform/identities/universal-auth.mdx
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@@ -31,7 +31,7 @@ then Infisical returns a short-lived access token that can be used to make authe
To be more specific:
1. The client submits a **Client ID** and **Client Secret** to Infisical.
1. The client submits a **Client ID** and **Client Secret** to Infisical at the `/api/v1/auth/universal-auth/login` endpoint.
2. Infisical verifies the credential pair.
3. If all is well, Infisical returns a short-lived access token that the client can use to make authenticated requests to the Infisical API.

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docs/mint.json
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@@ -153,6 +153,7 @@
"documentation/platform/auth-methods/email-password",
"documentation/platform/token",
"documentation/platform/identities/universal-auth",
"documentation/platform/identities/kubernetes-auth",
"documentation/platform/identities/gcp-auth",
"documentation/platform/identities/aws-auth",
"documentation/platform/mfa",