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Sidecar Injector for the Conjur Kubernetes Authenticator and Secretless

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CyberArk Sidecar Injector

Sidecars are used in Kubernetes to introduce additional features to application pods. Manual sidecar injection can be cumbersome and repetitive. CyberArk Sidecar Injector enables automatic sidecar injection through it being a mutating admission webhook controller. This means when CyberArk Sidecar Injector is deployed and enabled in a namespace, any pod created in that namespace with the appropriate annotations will result in automated sidecar injection.

CyberArk Sidecar Injector provides support for a selection of available sidecars that are configurable through annotations.

Note that unlike manual injection, automatic injection occurs at the pod-level. You will not see any change to the deployment itself. Instead you will want to check individual pods (via kubectl describe) to see the injected sidecar.

##Status: Beta

The CyberArk Sidecar Injector is currently in beta.

Naming and functionality are still subject to breaking changes.

Certification Level

The Secrets Provider push to File feature is a Certified level project. Certified projects have been reviewed and are supported by CyberArk. For more detailed information on our certification levels, see our community guidelines.

This document shows how to deploy and use the CyberArk Sidecar Injector mutating admission webhook controller which injects sidecar container(s) into a pod prior to persistence of the underlying object.

Prerequisites

Kubernetes 1.16.0 or above with the admissionregistration.k8s.io/v1 API enabled. Verify that by the following command:

~$ kubectl api-versions | grep admissionregistration.k8s.io/v1

The result should be:

admissionregistration.k8s.io/v1

In addition, the MutatingAdmissionWebhook and ValidatingAdmissionWebhook admission controllers should be added and listed in the correct order in the admission-control flag of kube-apiserver. Please see the Kubernetes documentation. It is likely that this is set by default if your cluster is running on GKE.

If using minikube, start your cluster as follows:

~$ minikube start --kubernetes-version=v1.10.0

Available Sidecars

This section enumerates the available sidecars. The choice of sidecar is made via annotations - see the Configuration section for details.

  1. Secretless
  2. Authenticator
  3. Secrets Provider

Secretless

See the README

Injects:

  • a newly created Volume named secretless-config sourced from a ConfigMap
  • a configurable Secretless container with:
    • a Volume Mount at /etc/secretless of the secretless-config Volume

Authenticator

See the README

Injects:

  • a newly created shareable in-memory Volume named conjur-access-token used to store the access token
  • a configurable Authenticator container with:
    • a Volume Mount at /run/conjur of the conjur-access-token Volume
  • a read-only Volume Mount at /run/conjur of the conjur-access-token Volume for each of the containers whose names appears in the comma-separated list of container names that you may configure.

Secrets Provider

See the README

Injects:

  • Newly created shareable in-memory Volumes named podInfo and conjur-secrets.
  • a configurable Secrets Provider container
  • Volume Mounts at /conjur/secrets and /conjur/podinfo

Requires:

  • a configMap in the namespace that the sidecar resides in. The config map can be the Golden config or the Conjur connect config map.
  • The sidecar deployment manifest must include the conjur-connect configmap or the Golden configmap

For example to add the Golden config to the sidecar manifest:

    envFrom:
      - configMapRef:
          name: conjur-configmap

Mandatory TLS

Supporting TLS for external webhook server is required because admission is a high security operation. As part of the installation process, we need to create a TLS certificate signed by a trusted CA (shown below is the Kubernetes CA but you can use your own) to secure the communication between the webhook server and kube-apiserver. For the complete steps of creating and approving Certificate Signing Requests(CSR), please refer to Managing TLS in a cluster.

Docker Image

The docker image for the mutating admission webhook server is publicly available on Dockerhub as cyberark/sidecar-injector.

The docker image entrypoint is the server binary. The binary supports the following flags:

Usage of cyberark-sidecar-injector:
  -authenticator-image string
        Container image for the Kubernetes Authenticator sidecar (default "cyberark/conjur-kubernetes-authenticator:latest")
  -noHTTPS
        Run Webhook server as HTTP (not HTTPS).
  -port int
        Webhook server port. (default 443)
  -secretless-image string
        Container image for the Secretless sidecar (default "cyberark/secretless-broker:latest")
  -tlsCertFile string
        Path to file containing the x509 Certificate for HTTPS. (default "/etc/webhook/certs/cert.pem")
  -tlsKeyFile string
        Path to file containing the x509 Private Key for HTTPS. (default "/etc/webhook/certs/key.pem")
  -version
        Show current version

Installation

Installation is possible either

Installing the Sidecar Injector (Manually)

Dedicated Namespace

Create a namespace injectors, where you will deploy the CyberArk Sidecar Injector Webhook components.

  1. Create namespace 
    ~$ kubectl create namespace injectors

Deploy Sidecar Injector

  1. Create a signed cert/key pair and store it in a Kubernetes secret that will be consumed by sidecar injector deployment

    ~$ ./deployment/webhook-create-signed-cert.sh \
    --service cyberark-sidecar-injector \
    --secret cyberark-sidecar-injector \
    --namespace injectors

  2. Patch the MutatingWebhookConfiguration by setting caBundle with correct value from Kubernetes cluster

    ~$ cat deployment/mutatingwebhook.yaml | \
    deployment/webhook-patch-ca-bundle.sh \
      --namespace-selector-label cyberark-sidecar-injector \
      --service cyberark-sidecar-injector \
      --namespace injectors > \
    deployment/mutatingwebhook-ca-bundle.yaml

  3. Generate sidecar injector deployment manifest. Note: add --secrets-provider if using secrets provider.

    ~$ ./deployment/deployment.yaml.sh \
     --deployment-api-version apps/v1 \
     --sidecar-injector-image cyberark/sidecar-injector:latest \
     --secretless-image cyberark/secretless-broker:latest \
     --authenticator-image cyberark/conjur-kubernetes-authenticator:latest \
     --secrets-provider-image cyberark/secrets-provider-for-k8s:latest
     > ./deployment/deployment.yaml

  4. Deploy resources

    ~$ kubectl -n injectors apply -f deployment/deployment.yaml
~$ kubectl -n injectors apply -f deployment/service.yaml
~$ kubectl -n injectors apply -f deployment/mutatingwebhook-ca-bundle.yaml
~$ kubectl -n injectors apply -f deployment/crd.yaml

Verify Sidecar Injector Installation

  1. The sidecar injector webhook should be running 
    ~$ kubectl -n injectors get pods
    NAME                                                  READY     STATUS    RESTARTS   AGE
cyberark-sidecar-injector-bbb689d69-882dd   1/1       Running   0          5m

    ~$ kubectl -n injectors get deployment
    NAME                                  DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
cyberark-sidecar-injector             1         1         1            1           5m

Installing the Sidecar Injector (Helm)

To install the sidecar injector in the injectors namespace run the following:

helm --namespace injectors \
 install \
 --set "deploymentApiVersion=apps/v1" \
 --set "caBundle=$(kubectl -n kube-system \
   get configmap \
   extension-apiserver-authentication \
   -o=jsonpath='{.data.client-ca-file}' \
 )" \
 ./helm/cyberark-sidecar-injector/  --generate-name

Optionally, if you want to specify the Secretless, Conjur Authenticator and/or Secrets Provider Docker image references, you can specify this in the helm install command:

helm --namespace injectors \
 install \
 --set "deploymentApiVersion=apps/v1" \
 --set "caBundle=$(kubectl -n kube-system \
    get configmap \
    extension-apiserver-authentication \
    -o=jsonpath='{.data.client-ca-file}' \
  )" \
 --set secretlessImage=path/to/secretless/container/image/repo/and/tag" \
 --set authenticatorImage=path/to/authenticator/container/image/repo/and/tag" \
 --set secretsProviderImage=path/to/secretsProvider/container/image/repo/and/tag" \
 ./helm/cyberark-sidecar-injector/  --generate-name

Below is example output from the helm install command:

...

NOTES:
## Instructions
Before you can proceed to use the sidecar-injector, there's one last step.
You will need to approve the CSR (Certificate Signing Request) made by the
sidecar-injector.
This allows the sidecar-injector to communicate securely with the Kubernetes API.

### Watch initContainer logs for when CSR is created
kubectl -n injectors logs deployment/cyberark-sidecar-injector -c
init-webhook -f

### You can check and inspect the CSR
kubectl describe csr "cyberark-sidecar-injector.injectors"

### Approve the CSR
kubectl certificate approve "cyberark-sidecar-injector.injectors"

Now that everything is setup you can enjoy the Cyberark Sidecar Injector.
This is the general workflow:

1. Annotate your application to enable the injector and to configure the sidecar (see
README.md)
2. Webhook intercepts and injects containers as needed

Enjoy.

Make sure to read the NOTES section once the chart is installed; instructions are provided on how to accept the CSR request. The CSR request must be approved.

Using the Sidecar Injector

Configuration

The configurable parameters should be set as annotations on the Pod template spec and NOT on the Deployment, Job or otherwise*. The sidecar injector will not inject the sidecar into pods by default. Add the conjur.org/inject annotation with value true to the Pod template spec to enable injection. Injection will not go ahead if the annotations are not on the Pod template spec.

Note: Configurable parameters of the Sidecar Injector have changed!

For Sidecar injector versions 0.1.1 and below the parameters used sidecar-injector.cyberark.com/xxx. This has been updated to conjur.org/xxx in version 0.2.0 and above.

The following table lists the configurable parameters of the Sidecar Injector and their default values.

Parameter Description Default
conjur.org/inject Enable the Sidecar Injector by setting to true nil (required)
conjur.org/secretless-config ConfigMap holding Secretless configuration nil (required for secretless)
conjur.org/conjurAuthConfig ConfigMap holding Conjur authentication configuration nil (required for authenticator
conjur.org/conjurConnConfig ConfigMap holding Conjur connection configuration nil (required for authenticator
conjur.org/inject-type Injected Sidecar type (secretless, authenticator or secrets-provider) nil (required)
conjur.org/conjur-inject-volumes Comma-separated list of the names of containers, in the pod, that will be injected with conjur-access-token or conjur-secrets and conjur-status VolumeMounts. (e.g. app-container-1,app-container-2) nil (applies to authenticator and secrets provider)
conjur.org/container-mode Sidecar Container mode (init or sidecar) (secretless only supports sidecar) defaults to sidecar
conjur.org/container-name Sidecar Container name nil (only applies to authenticator and secrets-provider)
conjur.org/container-image Sidecar Container image defaults to the value configured for the sidecar-injector at startup, using the -secretless-image or -authenticator-image or -secrets-provider CLI arguments.

conjur.org/secretless-config

There are three options for the value of secretless-config:

  1. configmapName 1. configfile#configmapname 1. k8s/crd#crdName

Option one is legacy, providing backwards compatibility by only specifying a configmap name. The general format is provider#identifier.

If a config map is referenced, it should contain the following path:

  • secretless.yml - Secretless Configuration File

For help using a CRD to configure secretless, Refer to the secretless CRD readme.

conjur.org/conjurConnConfig

Expected to contain the following paths:

  • CONJUR_VERSION - the version of your Conjur instance (4 or 5)
  • CONJUR_APPLIANCE_URL - the URL of the Conjur appliance instance you are connecting to
  • CONJUR_AUTHN_URL - the URL of the authenticator service endpoint
  • CONJUR_ACCOUNT - the account name for the Conjur instance you are connecting to
  • CONJUR_SSL_CERTIFICATE - the x509 certificate that was created when Conjur was initiated

conjur.org/conjurAuthConfig

Expected to contain the following path:

  • CONJUR_AUTHN_LOGIN - Host login for pod e.g. namespace/service_account/some_service_account

Secretless Sidecar Injection Example

For this section, you'll work from a test namespace $TEST_APP_NAMESPACE_NAME (see below). Later you will label this namespace with cyberark-sidecar-injector=enabled so as to allow the cyberark-sidecar-injector to operate on pods created in this namespace.

  1. Set test namespace environment variable

    export TEST_APP_NAMESPACE_NAME=secretless-sidecar-test

  2. Create test namespace

    ~$ kubectl create namespace ${TEST_APP_NAMESPACE_NAME}

  3. Label the default namespace with cyberark-sidecar-injector=enabled

    ~$ kubectl label \
  namespace ${TEST_APP_NAMESPACE_NAME} \
  cyberark-sidecar-injector=enabled

~$ kubectl get namespace \
  -L cyberark-sidecar-injector
    NAME                            STATUS    AGE       CYBERARK-SIDECAR-INJECTOR
default                         Active    18h
kube-public                     Active    18h
kube-system                     Active    18h
cyberark-sidecar-injector       Active    18h
secretless-sidecar-test         Active    18h       enabled

  4. Create Secretless ConfigMap

    This configuration sets up an http service authenticator listening on 0.0.0.0:3000 using the basic_auth authentication strategy. The service authenticator is passed the actual values for the user and password using the literal secret provider.

    As shown below, the username and password are the literal values my-username and secretpassword, respectively.

    ~$ cat << EOL | kubectl -n ${TEST_APP_NAMESPACE_NAME} create configmap secretless --from-file=secretless.yml=/dev/stdin
version: "2"
services:
  my-service-proxy:
    protocol: http
    listenOn: tcp://0.0.0.0:3000
    credentials:
      username: my-username
      password: secretpassword
    config:
      authenticationStrategy: basic_auth
      authenticateURLsMatching:
        - ^http.*
EOL

  5. Deploy an echo server app with the Secretless Sidecar:

    The app is an echo server listening on port 8080, which echoes the request header of any requests sent to it.

    The Secretless Sidecar is injected into the application pod on pod creation via the sidecar injector. The injection is configured via annotations.

    • The secretless ConfigMap is used as a source for Secretless configuration.
    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} \
  delete pod \
  test-app --ignore-not-found

~$ cat << EOF | kubectl -n ${TEST_APP_NAMESPACE_NAME} create -f -
apiVersion: v1
kind: Pod
metadata:
  name: test-app
  annotations:
    conjur.org/inject: "yes"
    conjur.org/secretless-config: "secretless"
    conjur.org/inject-type: "secretless"
  labels:
    app: test-app
spec:
  containers:
    - name: app
      env:
        - name: http_proxy
          value: "http://0.0.0.0:3000"
      image: googlecontainer/echoserver:1.1
EOF

  6. Verify Secretless sidecar container injected

    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} get pods
    NAME                     READY     STATUS        RESTARTS   AGE
test-app                 2/2       Running       0          1m

  7. Test Secretless

    In this step, you test Secretless by execing into the application pod's main container and issuing an HTTP request against the echo server proxied by Secretless.

    The pod spec for the echo server sets the environment variable http_proxy within the application to the Secretless http service authenticator's address http://0.0.0.0:3000. This allows Secretless to inject HTTP Authorization headers when proxying the request, as per the Secretless configuration above.

    The HTTP Authorization headers are extracted and base64 decoded from the response to retrieve the username and password.

    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} \
  exec test-app \
  -c app \
  -i \
  -- \
  curl --silent localhost:8080 \
    | grep authorization \
    | sed -e s/^authorization=Basic\ // \
    | base64 --decode; echo

    my-username:secretpassword

Conjur Authenticator/Secretless Sidecar/Secrets Provider Injection Example

For this section, you'll work from a test namespace $TEST_APP_NAMESPACE_NAME (see below). Later you will label this namespace with cyberark-sidecar-injector=enabled so as to allow the cyberark-sidecar-injector to operate on pods created in this namespace.

  1. Setup a Conjur appliance running with the Kubernetes authenticator installed and enabled. e.g. run ./start in kubernetes-conjur-deploy

  2. Load Conjur policy to create a host for the service account $TEST_APP_SERVICE_ACCOUNT. e.g. test-app-secretless is made available by walking through kubernetes-conjur-demo up to and including ./3_init_conjur_cert_authority.sh

  3. Set up environment variables, if not already set from kubernetes-conjur-demo

    # REQUIRED values, identical to those used for
# kubernetes-conjur-deploy and kubernetes-conjur-demo
export CONJUR_VERSION=...
export CONJUR_NAMESPACE_NAME=...
export CONJUR_ACCOUNT=...
export AUTHENTICATOR_ID=...
export TEST_APP_NAMESPACE_NAME=...

  4. Set up pod-specific environment variables - modify to match your environment

    # REQUIRED values
export TEST_APP_SERVICE_ACCOUNT=test-app-secretless
export containerMode=sidecar

  5. Generate derived Conjur connection environment variables

    # derived values
## CONJUR_APPLIANCE_URL
CONJUR_APPLIANCE_URL="https://conjur-follower.${CONJUR_NAMESPACE_NAME}.svc.cluster.local/api"
## CONJUR_AUTHN_URL
CONJUR_AUTHN_URL="https://conjur-follower.${CONJUR_NAMESPACE_NAME}.svc.cluster.local/api/authn-k8s/${AUTHENTICATOR_ID}"
## CONJUR_AUTHN_LOGIN
if [ ${CONJUR_VERSION} == '4' ]; then
  CONJUR_AUTHN_LOGIN=${TEST_APP_NAMESPACE_NAME}/service_account/${TEST_APP_SERVICE_ACCOUNT}
else
  CONJUR_AUTHN_LOGIN=host/conjur/authn-k8s/${AUTHENTICATOR_ID}/apps/${TEST_APP_NAMESPACE_NAME}/service_account/${TEST_APP_SERVICE_ACCOUNT}
fi
## CONJUR_SSL_CERTIFICATE
### get one of the follower pod names
follower_pod_name=$(kubectl -n ${CONJUR_NAMESPACE_NAME} \
  get pods \
  -l role=follower --no-headers \
  | awk '{ print $1 }' | head -1);

CONJUR_SSL_CERTIFICATE=$(kubectl -n ${CONJUR_NAMESPACE_NAME} \
  exec \
  $follower_pod_name \
  -- cat /opt/conjur/etc/ssl/conjur.pem)

  6. Create test namespace

    ~$ kubectl create namespace ${TEST_APP_NAMESPACE_NAME}

  7. Label the default namespace with cyberark-sidecar-injector=enabled

    ~$ kubectl label \
  namespace ${TEST_APP_NAMESPACE_NAME} \
  cyberark-sidecar-injector=enabled

~$ kubectl get namespace -L cyberark-sidecar-injector
    NAME                            STATUS    AGE       CYBERARK-SIDECAR-INJECTOR
default                         Active    18h
kube-public                     Active    18h
kube-system                     Active    18h
cyberark-sidecar-injector       Active    18h
conjur-sidecar-test             Active    18h       enabled

  8. Create service account (might already exist from kubernetes-conjur-demo) to be used by the application pod

    This service account maps to the Conjur identity for the pod

    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} \
create serviceaccount ${TEST_APP_SERVICE_ACCOUNT}

  9. Create Conjur ConfigMap

    This ConfigMap named conjur stores the connection details to the Conjur appliance. These details are necessary for both the Authenticator and Secretless sidecars to communicate with the Conjur appliance.

    ~$ cat << EOL | kubectl -n ${TEST_APP_NAMESPACE_NAME} apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
  name: conjur
data:
  CONJUR_ACCOUNT: "${CONJUR_ACCOUNT}"
  CONJUR_VERSION: "${CONJUR_VERSION}"
  CONJUR_APPLIANCE_URL: "${CONJUR_APPLIANCE_URL}"
  CONJUR_AUTHN_URL: "${CONJUR_AUTHN_URL}"
  CONJUR_SSL_CERTIFICATE: |
$(echo "${CONJUR_SSL_CERTIFICATE}" | awk '{ print "    " $0 }')
  CONJUR_AUTHN_LOGIN: "${CONJUR_AUTHN_LOGIN}"
EOL

  10. You can now leverage Conjur by either

    1. Deploying the Authenticator Sidecar or
    2. Deploying the Secretless Sidecar or
    3. Deploying the Secrets Provider Sidecar

Deploy Authenticator Sidecar

  1. Deploy an app with the Authenticator Sidecar:

    The Authenticator Sidecar is injected into the application pod on pod creation via the sidecar injector. The injection is configured via annotations.

    • The conjur ConfigMap is used for both Conjur Authentication and Connection configuration
    • The conjur.org/container-name is set to "secretless" because the corresponding Conjur identity to the service account used expects the sidecar container to be named secretless.
    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} \
  delete pod \
  test-app --ignore-not-found

~$ cat << EOF | kubectl -n ${TEST_APP_NAMESPACE_NAME} apply -f -
apiVersion: v1
kind: Pod
metadata:
  annotations:
    conjur.org/conjurAuthConfig: conjur
    conjur.org/conjurConnConfig: conjur
    conjur.org/container-mode: ${containerMode}
    conjur.org/conjur-token-receivers: "app"
    conjur.org/inject: "yes"
    conjur.org/inject-type: authenticator
    conjur.org/container-name: secretless
  labels:
    app: test-app
  name: test-app
spec:
  containers:
  - image: googlecontainer/echoserver:1.1
    name: app
  serviceAccountName: ${TEST_APP_SERVICE_ACCOUNT}
EOF

  2. Verify Authenticator sidecar container injected

    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} get pods
    NAME                     READY     STATUS        RESTARTS   AGE
test-app                 2/2       Running       0          1m

  3. Test Authenticator

    In this step, you test the Authenticator by execing into the application pod's main container and read the contents of /run/conjur/access-token.

    The /run/conjur/access-token file contains the access token which is injected by the Authenticator sidecar upon successful authentication against the Conjur appliance. Note that this file is volume mounted into the application pod's main container as a result of the annotation conjur.org/conjur-token-receivers being set to that container's name.

    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} \
  exec test-app \
  -c app \
  -i \
  -- \
  cat /run/conjur/access-token | jq .
    {
  "data": "host/conjur/authn-k8s/sidecar-test/apps/sidecar-example-app/service_account/test-app-secretless",
  "timestamp": "2018-09-20 16:54:04 UTC",
  "signature": "aICQDREA2S-ulOxu8yMWqT9o8h_JDKuuDKIJOFBbQsL_uKZuovManGn-q2Yr4wdT9f_kJdgCNsxh9q54w2ciptn5sAFB3YzDAmqfUzjWv9pIwel2o7N2nuzIw-h7Ho6hA2PQ8V1Iz3NSILCT2JAnWDTi_--bplxqa6g72-j0xprkuFMkDvj2cd084WtMMWXii4W_5WG6BWA9jtnd72-tzhoaU4LFSRfSK7LON8aDdzyFexkM1IbjIuiF1sASBIsvnuY2GeghNDO8VciKh6dXe-sBqNlISlYOTOaQoEMIxA8Nm2t9jeYxmDHJ0IFkTmneeC2dgaJWWoF7MtfJnyPvwn_Z-bF49hkcYDL37-xJxUHPDA4QoU_4p82oqgC3NPnI",
  "key": "11cd239ab55175a3c0f93a7376abe663"
}

Deploy Secretless Sidecar

  1. Create Secretless ConfigMap:

    This configuration sets up an http service authenticator on 0.0.0.0:3000 using the basic_auth authentication strategy that retrieves user and password using the conjur secret provider.

    The username and password are set and stored within the Conjur appliance.

    ~$ cat << EOL | kubectl -n ${TEST_APP_NAMESPACE_NAME} create configmap secretless --from-file=secretless.yml=/dev/stdin
services:
  my-service-proxy:
    protocol: http
    listenOn: tcp://0.0.0.0:3000
    credentials:
      username:
        from: conjur
        get: test-secretless-app-db/username
      password:
        from: conjur
        get: test-secretless-app-db/password
    config:
      authenticationStrategy: basic_auth
      authenticateURLsMatching:
        - ^http.*
EOL

  2. Deploy an echo server app with the Secretless Sidecar:

    The app is an echo server listening on port 8080, which echoes the request header of any requests sent to it.

    The Secretless Sidecar is injected into the application pod on pod creation via the sidecar injector. The injection is configured via annotations.

    • The conjur ConfigMap is used for both Conjur Authentication and Connection configuration
    • The secretless ConfigMap is used as a source for Secretless configuration.
    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} \
delete pod \
test-app --ignore-not-found

~$ cat << EOF | kubectl -n ${TEST_APP_NAMESPACE_NAME} apply -f -
apiVersion: v1
kind: Pod
metadata:
  annotations:
    conjur.org/conjurAuthConfig: conjur
    conjur.org/conjurConnConfig: conjur
    conjur.org/inject: "yes"
    conjur.org/inject-type: secretless
    conjur.org/secretless-config: secretless
  labels:
    app: test-app
  name: test-app
spec:
  containers:
  - env:
      - name: http_proxy
        value: "http://0.0.0.0:3000"
    image: googlecontainer/echoserver:1.1
    name: app
  serviceAccountName: ${TEST_APP_SERVICE_ACCOUNT}
EOF

  3. Verify Secretless sidecar container injected

    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} get pods
    NAME                     READY     STATUS        RESTARTS   AGE
test-app                 2/2       Running       0          1m

  4. Test Secretless with Conjur

    In this step, you test Secretless by execing into the application pod's main container and issuing an HTTP request against the echo server proxied by Secretless.

    The pod spec for the echo server sets the environment variable http_proxy within the application to the Secretless http service authenticator's address http://0.0.0.0:3000. This allows Secretless to inject HTTP Authorization headers when proxying the request, as per the Secretless configuration above.

    The HTTP Authorization headers are extracted and base64 decoded from the response to retrieve the username and password.

    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} \
  exec test-app \
  -c app \
  -i \
  -- \
  curl --silent localhost:8080 \
    | grep authorization \
    | sed -e s/^authorization=Basic\ // \
    | base64 --decode; echo
    "test_app:84674b2874a5d7c952e7fec8"

Deploy Secrets Provider Sidecar

  1. Deploy an app with the Secrets Provider Sidecar:

    The Secrets Provider Sidecar is injected into the application pod on pod creation via the sidecar injector. The injection is configured via annotations.

  • The conjur.org/container-name is set to "cyberark-secrets-provider-for-k8s".

    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} \
  delete pod \
  test-app --ignore-not-found

~$ cat << EOF | kubectl -n ${TEST_APP_NAMESPACE_NAME} apply -f -
apiVersion: v1
kind: Pod
metadata:
  annotations:
    conjur.org/inject: "true"
    conjur.org/inject-type: "secrets-provider"
    conjur.org/container-name: "cyberark-secrets-provider-for-k8s"
    conjur.org/container-image: "docker.io/cyberark/secrets-provider-for-k8s:edge"
    conjur.org/conjur-token-receivers: "test-app"
    conjur.org/authn-identity: host/conjur/authn-k8s/my-authenticator-id/apps/test-app-secrets-provider-p2f
    conjur.org/container-mode: init
    conjur.org/secrets-destination: file
    conjur.org/conjur-secrets.test-app: |
      - admin-username: username
      - admin-password: password
    conjur.org/conjur-secrets-policy-path.test-app: test-secrets-provider-p2f-app-db/
    conjur.org/secret-file-path.test-app: "./application.yaml"
    conjur.org/secret-file-format.test-app: "yaml"
  labels:
    app: test-app
  name: test-app
spec:
  containers:
  - image: googlecontainer/echoserver:1.1
    name: app
  serviceAccountName: ${TEST_APP_SERVICE_ACCOUNT}
EOF

  1. Verify Authenticator sidecar container injected

    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} get pods
    NAME                     READY     STATUS        RESTARTS   AGE
test-app                 2/2       Running       0          1m

  2. Test Secrets Provider

    In this step, you test the Secrets Provider by execing into the application pod's main container and read the file /conjur/secrets/application.yaml.

    The /conjur/secrets/application.yaml file contains the secrets that are injected by the Secrets Provider sidecar upon successful authentication against the Conjur appliance. Note that this file is volume mounted into the application pod's main container as a result of the annotation conjur.org/conjur-inject-volumes being set to that container's name.

    ~$ kubectl -n ${TEST_APP_NAMESPACE_NAME} \
  exec test-app \
  -c app \
  -i \
  -- \
  cat /conjur/secrets/application.yaml
    "admin-username": "test_app"
"admin-password": "9622c67ebd1f5fa94ef114da"

Contributing

We welcome contributions of all kinds to this repository. For instructions on how to get started and descriptions of our development workflows, please see our contributing guide.

License

The Sidecar Injector is licensed under Apache License 2.0 - see LICENSE for more details.

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Sidecar Injector for the Conjur Kubernetes Authenticator and Secretless

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kubernetes conjur conjbot-notify sidecar-injector secretless conjur-community-team

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v0.1.0 Latest
Jun 9, 2020
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