App Secrets using Wingman

Objective

This document provides instructions on how to encrypt your application secrets using the F5® Distributed Cloud Services Blindfold and how to decrypt from your vk8s application. To learn more about Blindfold and secrets management, see Blindfold.

The following image illustrates the sequence of actions performed by Distributed Cloud Services in securing the secrets:

Figure: Distributed Cloud Services Blindfold

Using the instructions provided in this guide, you can encrypt application secrets and store them in code or configmap.

Prerequisites

The following prerequisites apply:

• A Distributed Cloud Services Account. If you do not have an account, see Create an Account.

• An application running on vk8s. If you do not have an application running on vk8s, see Deploy Application.

• The vesctl tool. Download vesctl on your local machine, as it is used to apply the Blindfold to the TLS certificate.

• A minimum of monitor role in the Shared namespace is required.

Accessing secrets in Application

Workflow

Applying Blindfold to the secret of your cloud application includes performing the following sequence of actions:

Note: You must download the API credentials in PKCS #12 file format.

Create a Secret Policy

The secret policy allows Wingman running as sidecar in your application access to the secret.

Create a secret policy using the instructions provided in the Secrets Policy document. This example assumes that a policy named demo-secret-policy is created.

Note: Wingman sidecar communicates with Distributed Cloud Services. Therefore, traffic flows from vK8s pods to Distributed Cloud Services.

Prepare Credentials and Policy

openssl pkcs12 -nokeys -in demo-api-credentials.p12 -out demo-api.crt

openssl pkcs12 -nocerts -nodes -in demo-api-credentials.p12 -out demo-api.key

vesctl --cert file:///demo-api.crt --key file:///demo-api.key -u https://demo-api.console.ves.volterra.io/api request secrets get-public-key > demo-api-pubkey

data:
  keyVersion: 1
  modulusBase64:   rc3DxZa69sWeIn9NRrHGcZlZaXLHWYjc57jIS76Z47AcU0jDmodz3lNEysVO2swNAUn8p6yiuvf8Vj4LUuWB++LdP2yYX5ftEHmMgnHVq4AdKFBp5zbrh15g7mS0lpdX/xG6h0+IdHyrWPoIg/hZwYyV9xmIOcFc1Jk5PZC554hchHbToQ==
  publicExponentBase64: A6ur/Xk=
  tenant: volterra-demo1

vesctl --cert file:///demo-api.crt --key file:///demo-api.key -u https://demo-api.console.ves.volterra.io/api request secrets get-policy-document --namespace volterra-demo --name demo-secret-policy > demo-secret-policy

data:
  name: demo-secret-policy
  namespace: volterra-demo
  policyId: "101"
  policyInfo:
    rules:
    - action: ALLOW
      clientSelector:
        expressions:
        - app = demo-tls-server
  tenant: volterrra-demo1

Encrypt your Application Secret Using Blindfold

Use vesctl to encrypt secret using Blindfold and store the returned encrypted secret for using it in the application.

This is secret data that should only be seen by the application pod:

cat secretfile.data

This example stores the output to a file named secret.enc:

vesctl --cert file:///demo-api.crt --key file:///demo-api.key -u https://demo-api.console.ves.volterra.io/api request secrets encrypt --policy-document demo-secret-policy --public-key demo-api-pubkey secretfile.data > secret.enc

Note: Provide the certificate, key, public key, and policy document obtained in the Prepare Credentials and Policy chapter.

The following output capture shows a sample encrypted key:

Encrypted Secret (Base64 encoded):
AAAACWN1c3RvbWVyMQAAAAEAAAAAAAAAaAIAAAAFA6ur/XkAAAEArc3DxZa69sWeIn9NRrHGcZlZaXLHWYjc57jIS76Z47AcU0jDmodz3lNEysVO2s

This encrypted secret can be provided to the application pod via several means - put the encrypted secret in code, provided via configmap, provided via Kubernetes secret, etc.

Decrypt your Application Secret

The application needs to make a REST call to Wingman (running a REST server on localhost:8070) to decrypt the secret. API specifications are specified here.

cat input.json

{
  "type": "blindfold",
  "location": "string:///AAAACWN1c3RvbWVyMQAAAAEAAAAAAAAAaAIAAAAFA6ur/XkAAAEArc3DxZa69sWeIn9NRrHGcZlZaXLHWYjc57jIS76Z47AcU0jDmodz3lNEysVO2s"
}

The following is an example curl request and output:

curl -XPOST http://localhost:8070/secret/unseal -d @input.json
VGhpcyBpcyBzZWNyZXQgZGF0YSB0aGF0IHNob3VsZCBvbmx5IGJlIHNlZW4gYnkgYXBwbGljYXRpb24gcG9kLg==

The output of the REST call is a decrypted secret in Base64 encoding format. If we get the original secret back, perform Base64 decoding of the output string value.

This is secret data that should only be seen by the application pod:

echo "VGhpcyBpcyBzZWNyZXQgZGF0YSB0aGF0IHNob3VsZCBvbmx5IGJlIHNlZW4gYnkgYXBwbGljYXRpb24gcG9kLg==" | base64 -D

Disable Wingman

Wingman default sidecar injection can be optionally disabled to reduce overhead if Distributed Cloud secrets management services is not needed or if third-party secrets is used instead.

The following is an example:

spec:
  template:
    metadata:
      annotations:
        ves.io/wingman-injection-mode: disable

Concepts

• System Overview
• Core Concepts
• Virtual Host
• Blindfold

API References

• Virtual Host
• Secret Policy
• Wingman API Reference