ONVIF for IP Cameras

Background

ONVIF is a standard used by many IP cameras and defines discovery and access for RTSP camera streams. Along with an ONVIF Discovery Handler, Akri has provided a generic ONVIF Configuration for initiating ONVIF discovery. Akri has also provided a sample broker (akri-onvif-video-broker), which acts as a frame server.

Using Akri's default ONVIF Configuration to discover and utilize ONVIF cameras looks like the following:

An operator applies the ONVIF Configuration to the cluster (by enabling ONVIF when installing the Akri Helm chart). They also specific a broker image -- akri-onvif-video-broker in the figure.
The Akri Agent uses the ONVIF Discovery Handler to discover the IP cameras and creates Instances for each discovered camera.
The Akri Controller sees the Instances and deploys akri-onvif-video-broker pods, which were specified in the Configuration. The Controller also creates a Kubernetes service for each ONVIF camera along with one service for all the ONVIF cameras.

All of Akri's components can be deployed by specifying values in its Helm chart during an installation. This section will cover the values that should be set to (1) deploy the ONVIF Discovery Handlers and (2) apply a Configuration that tells Akri to discover devices using that Discovery Handler.

Deploying the ONVIF Discovery Handler

In order for the Agent to know how to discover IP cameras an ONVIF Discovery Handler must exist. Akri supports an Agent image that includes all supported Discovery Handlers. This Agent will be used if agent.full=true. By default, a slim Agent without any embedded Discovery Handlers is deployed and the required Discovery Handlers can be deployed as DaemonSets. This documentation will use that strategy, deploying ONVIF Discovery Handlers by specifying onvif.discovery.enabled=true when installing Akri.

ONVIF Configuration Settings

Instead of having to assemble your own ONVIF Configuration yaml, we have provided a Helm template. Helm allows us to parametrize the commonly modified fields in our configuration files, and we have provided many for ONVIF (to see them, run helm inspect values akri-helm-charts/akri). More information about the Akri Helm charts can be found in the user guide. To apply the ONVIF Configuration to your cluster, simply set onvif.configuration.enabled=true along with any of the following additional Configuration settings when installing Akri.

Discovery Handler Discovery Details Settings

Discovery Handlers are passed discovery details that are set in a Configuration to determine what to discover, filter out of discovery, and so on. The ONVIF Discovery Handler, supports the following discovery details:

*Onvif device uuid: the address property of the Endpoint Reference [ONVIF Core Specification 7.3.1 Endpoint reference] can be used as the device id to identify the device. The address property in Endpoint Reference is in the Uniform Resource Name: Universally Unique Identifier (URN:UUID) format. The same UUID can be retrieved by the GetEndpointReference command after a camera is discovered by Probe message.

Broker Pod Settings

If you would like non-terminating workloads ("broker" Pods) to be deployed automatically to discovered cameras, a broker image should be specified (under brokerPod) in the Configuration. Alternatively, if it meets your scenario, you could use the Akri frame server broker ("ghcr.io/project-akri/akri/onvif-video-broker"). If you would rather manually deploy pods to utilize the cameras advertized by Akri, don't specify a broker pod and see our documentation on requesting resources advertized by Akri.

Note only a brokerJob OR brokerPod should be specified.

Broker Job Settings

If you would like terminating Jobs to be deployed automatically to discovered cameras, a broker image should be specified (under brokerJob) in the Configuration. A Kubernetes Job deploys a set number of terminating Pods.

Note only a brokerJob OR brokerPod should be specified.

Disabling Automatic Service Creation

By default, if a broker Pod is specified, the generic ONVIF Configuration will create services for all the brokers of a specific Akri Instance and all the brokers of an Akri Configuration. The creation of these services can be disabled.

Capacity Setting

By default, if a broker Pod is specified, a single broker Pod is deployed to each device. To modify the Configuration so that a camera is accessed by more or fewer nodes via broker Pods, update the onvif.configuration.capacity setting to reflect the correct number. For example, if your high availability needs are met by having 1 redundant pod, you can update the Configuration like this by setting onvif.configuration.capacity=2.

Discovery Handler Discovery Properties Settings

Agent read the content of discoveryProperties in Configuration and generate a string key-value pair list to Discovery Handler. The Onvif discovery handler leverage the discoveryProperties to read the credentials for authenticated discovery. There are two attributes required for Onvif discovery handler to perform authenticated discovery:

an id that can unique identify a camera
a credential (username/password) to authenticate the access to a camera

Onvif discovery handler gets the device uuid when discovering Onvif camera devices, and use the id to look up for matching credential from the string key-value pair list passed by Agent.

Organize Credentials in Akri Configuration and Kubernetes Secrets

All secret information are kept in Kubernetes Secrets. In Configuration, we need to create a mapping for the secret information so Agent can read the secret information and pass it with the mapping to Onvif Discovery Handler. With the mapping and secret information, Onvif Discovery Handler can look up credential using device ids.

There are 3 ways to organize secret information:

Device credential list
Device credential ref list
Device credential entry

All three ways can be used in the same Configuration, the order above is the order of Onvif Discovery Handler processing the secret information. If there is any secret information duplication between different groups, the latter overwrites the prior entries. If there is any duplication within the same group, it’s up to the Onvif Discovery Handler to decide which one wins when processing the entries, and it’s not guaranteed the order is always the same.

Device credential list

Here is an example of Device credential list. In Configuration, an entry named “device_credential_list” is listed in discoveryProperties. The value contains an array of device secret lists. The device secret lists are entries that point to the actual Kubernetes Secret key.

    discoveryProperties:
    - name: "device_credential_list"
      value: |+
        [
          "secret_list1",
          "secret_list2"
        ]
    - name: "secret_list1"
      valueFrom:
        secretKeyRef:
          name: "onvif-auth-secret"
          namespace: "onvif-auth-secret-namespace"
          key: "secret_list1"
          optional: false
    - name: "secret_list2"
      valueFrom:
        secretKeyRef:
          name: "onvif-auth-secret"
          namespace: "onvif-auth-secret-namespace"
          key: "secret_list2"
          optional: false

In Kubernetes Secret onvif-auth-secret, the secret_list1 and secret_list2 contain the actual secret information for a list of devices. The entry uses the device id as key and the value is a json object with username and password. The password can be optionally encoded with base64 (with “base64encoded” set to true).

apiVersion: v1
kind: Secret
metadata:
  name: onvif-auth-secret
  namespace: onvif-auth-secret-namespace
type: Opaque
stringData:
  secret_list1: |+
    {
      "6821dc67-8438-5588-1547-4d1349048438" : { "username" : "admin", "password" : "adminpassword" },
      "6a67158b-42b1-400b-8afe-1bec9a5d7919" : { "username" : "user1", "password" : "SGFwcHlEYXk=", "base64encoded": true }
    }
  secret_list2: |+
    {
      "5f5a69c2-e0ae-504f-829b-00fcdab169cc" : { "username" : "admin", "password" : "admin" }
    }

Device credential ref list

Device credential ref list is similar to Device credential list except the device ids are listed and the credentials are references to another entries in the Akri discoveryProperties. The key name for device credential ref list is “device_credential_ref_list”.

For example, the device credential ref list below contains an array of “device id”->”credential reference” objects. The credential of device id “5f5a69c2-e0ae-504f-829b-00fcdab169cc” is refered to (username-> device1_username, password->device1_password). The device1_username and device1_password are entries in Akri discoverProperties that point to the actual secret information in Kubernetes Secrets. Note different device ids may use the same secret reference.

    - name: "device_credential_ref_list"
      value: |+
        [
          "secret_ref_list1",
          "secret_ref_list2"
        ]
    - name: "secret_ref_list1"
      value: |+
        {
          "5f5a69c2-e0ae-504f-829b-00fcdab169cc" : { "username_ref" : "device1_username", "password_ref" : "device1_password" },
          "6a67158b-42b1-400b-8afe-1bec9a5d7909":  { "username_ref" : "device2_username", "password_ref" : "device2_password" }
        }
    - name: "secret_ref_list2"
      value: |+
        {
          "7a67158b-42b1-400b-8afe-1bec9a5d790a":  { "username_ref" : "device2_username", "password_ref" : "device2_password" }
        }
    - name: "device1_username"
      valueFrom:
        secretKeyRef:
          name: "onvif-auth-secret"
          namespace: "onvif-auth-secret-namespace"
          key: "device1_username"
          optional: false
    - name: "device1_password"
      valueFrom:
        secretKeyRef:
          name: "onvif-auth-secret"
          namespace: "onvif-auth-secret-namespace"
          key: "device1_password"
          optional: true
    - name: "device2_username"
      valueFrom:
        secretKeyRef:
          name: "onvif-auth-secret"
          namespace: "onvif-auth-secret-namespace"
          key: "device2_username"
          optional: false
    - name: "device2_password"
      valueFrom:
        secretKeyRef:
          name: "onvif-auth-secret"
          namespace: "onvif-auth-secret-namespace"
          key: "device2_password"
          optional: true

The actual secret information is in Kubernetes Secret onvif-auth-secret

apiVersion: v1
kind: Secret
metadata:
  name: onvif-auth-secret
  namespace: onvif-auth-secret-namespace
type: Opaque
stringData:
  device1_username: "admin"
  device1_password: "admin"
  device2_username: "cam2_user"
  device2_password: "cam2_pwd"

Device credential entry

Device credential entry is a direct mapping from device id to its credential, using "username_<device-id>" and "password_<device id>" as key names, note that device_id is in uuid string format, need to convert to C_IDENTIFIER format for use it in discoveryProperties key name.

In addition to the "username_<device-id>" and "password_<device-id>" keys, Onvif Discovery Handler looks for two specific key names "username_default" and "password_default" that, if specified, Onvif Discovery Handler uses it as a fall back username/password value. If Onvif Discovery Handler cannot find a match credential by looking up the device id, and "username_default"/"password_default" are specified, Onvif Discovery Handler uses the default username/password to authenticate the device discovery.

    discoveryProperties:
    - name: "username_6a67158b_42b1_400b_8afe_1bec9a5d7909"
      valueFrom:
        secretKeyRef:
          name: "onvif-auth-secret"
          namespace: "onvif-auth-secret-namespace"
          key: "username_6a67158b_42b1_400b_8afe_1bec9a5d7909"
          optional: false
    - name: "password_6a67158b_42b1_400b_8afe_1bec9a5d7909"
      valueFrom:
        secretKeyRef:
          name: "onvif-auth-secret"
          namespace: "onvif-auth-secret-namespace"
          key: "password_6a67158b_42b1_400b_8afe_1bec9a5d7909"
          optional: false

The actual secret information is in Kubernetes Secret onvif-auth-secret

apiVersion: v1
kind: Secret
metadata:
  name: onvif-auth-secret
  namespace: onvif-auth-secret-namespace
type: Opaque
stringData:
  username_6a67158b_42b1_400b_8afe_1bec9a5d7909: "admin"
  password_6a67158b_42b1_400b_8afe_1bec9a5d7909: "admin"

Installing Akri with the ONVIF Configuration and Discovery Handler

Leveraging the above settings, Akri can be installed with the ONVIF Discovery Handler and an ONVIF Configuration that specifies the Akri frame server broker:

helm repo add akri-helm-charts https://project-akri.github.io/akri/
helm install akri akri-helm-charts/akri \
    --set onvif.discovery.enabled=true \
    --set onvif.configuration.enabled=true \
    --set onvif.configuration.brokerPod.image.repository="ghcr.io/project-akri/akri/onvif-video-broker" \
    --set onvif.configuration.brokerPod.image.tag="latest"

No discovery details were provided to filter the Discovery Handler's search so the Discovery Handler will find any ONVIF camera on the network and will deploy up to one broker pod to each camera, since capacity defaults to one. The brokers will supply the automatically created Instance Services and the Configuration Service with frames.

The following installation examples have been given to show how to the ONVIF Configuration can be tailored to you cluster:

Filtering ONVIF cameras
Changing the discovery timeout

Filtering ONVIF cameras

The ONVIF Discovery Handler supports basic filter capabilities has been provided. Discovery details can be set in the Configuration that tell the Discovery Handler to either include or exclude specific IP addresses, MAC addresses, ONVIF scopes, or device uuids.

For example, the following enables discovery of every camera that does not have an IP address of 10.0.0.1:

helm repo add akri-helm-charts https://project-akri.github.io/akri/
helm install akri akri-helm-charts/akri \
    --set onvif.discovery.enabled=true \
    --set onvif.configuration.enabled=true \
    --set onvif.configuration.brokerPod.image.repository="ghcr.io/project-akri/akri/onvif-video-broker" \
    --set onvif.configuration.discoveryDetails.ipAddresses.action=Exclude \
    --set onvif.configuration.discoveryDetails.ipAddresses.items[0]=10.0.0.1

The following enables discovery of every camera that uuid is not 3fa1fe68-b915-4053-a3e1-ac15a21f5f91:

helm repo add akri-helm-charts https://project-akri.github.io/akri/
helm install akri akri-helm-charts/akri \
    --set onvif.discovery.enabled=true \
    --set onvif.configuration.enabled=true \
    --set onvif.configuration.brokerPod.image.repository="ghcr.io/project-akri/akri/onvif-video-broker" \
    --set onvif.configuration.discoveryDetails.uuids.action=Exclude \
    --set onvif.configuration.discoveryDetails.uuids.items[0]="3fa1fe68-b915-4053-a3e1-ac15a21f5f91"

You can enable cluster access for every camera with a specific name, you can modify the Configuration like so:

helm repo add akri-helm-charts https://project-akri.github.io/akri/
helm install akri akri-helm-charts/akri \
    --set onvif.discovery.enabled=true \
    --set onvif.configuration.enabled=true \
    --set onvif.configuration.brokerPod.image.repository="ghcr.io/project-akri/akri/onvif-video-broker" \
    --set onvif.configuration.discoveryDetails.scopes.action=Include \
    --set onvif.configuration.discoveryDetails.scopes.items[0]="onvif://www.onvif.configuration.org/name/GreatONVIFCamera" \
    --set onvif.configuration.discoveryDetails.scopes.items[1]="onvif://www.onvif.configuration.org/name/AwesomeONVIFCamera"

Changing the discovery timeout

The ONVIF Discovery Handler will search for up to discoveryTimeoutSeconds for IP cameras. This timeout can be increased or decreased as desired, and defaults to 1 second if not configured. It can be set in the Configuration like this:

helm repo add akri-helm-charts https://project-akri.github.io/akri/
helm install akri akri-helm-charts/akri \
    --set onvif.discovery.enabled=true \
    --set onvif.configuration.enabled=true \
    --set onvif.configuration.brokerPod.image.repository="ghcr.io/project-akri/akri/onvif-video-broker" \
    --set onvif.configuration.discoveryDetails.discoveryTimeoutSeconds=2

Accessing Secret data in Broker

The Onvif sample broker (akri-onvif-video-broker) can be configured to access Secret and ConfigMap data, if configured, it expects the Secret and ConfigMap data are mounted as files. The sample broker checks the environment variables CREDENTIAL_DIRECTORY for the directory that contains Secret data and CREDENTIAL_CONFIGMAP_DIRECTORY for direcctory contains configMap data. CREDENTIAL_CONFIGMAP_DIRECTORY is optional. When the sample broker launched, the uuids of discovered Onvif devices are set in the environment variables ONVIF_DEVICE_UUID_{INSTANCE_HASH_ID}, the sample broker picks the first one found from the environment variables ONVIF_DEVICE_UUID_{INSTANCE_HASH_ID} as device uuid and get match credential from files under CREDENTIAL_DIRECTORY and CREDENTIAL_CONFIGMAP_DIRECTORY. The schema of how the Secret/ConfigMap files are organized aligned to the schema that Onvif Discovery Handler used for passing the secret data, as follow:

The sample broker first looks for files under CREDENTIAL_DIRECTORY with file name "username_<device_uuid>" for username and "password_<device_uuid>" for password, where device_uuid is the device uuid string that replaces all '-' with underscore ''. If file "username<device_uuid>" exists, but "password_<device_uuid>" doesn't exist, the sample broker uses empty string as password. The sample broker also looks for files "username_default" and "password_default", if found, the username and password is used as fallback username/password if a credential with matched device uuid can not be found.
If the sample broker can not find a matched credential from the username/password secret files directly, it looks for credentials from the device credential ref list device_credential_ref_list. The sample broker try to get a file name device_credential_ref_list from CREDENTIAL_CONFIGMAP_DIRECTORY, and if the file does not exists, it tries to get the same file name under CREDENTIAL_DIRECTORY. The credential ref list should contains reference entries to the actual credentals. The sample broker look up the device uuid from the list to get the credential referece and read the actual credential files from CREDENTIAL_DIRECTORY. Similar to the fallback credenial "username_default" and "password_default", a credential ref entry with key "default" indicates the fallback credental.
if the sample broker can not find a matched credental from credential ref list, it looks for credentials from crdential list device_credential_list. The sample broker try to get a file name device_credential_list from CREDENTIAL_CONFIGMAP_DIRECTORY, and if the file does not exist, it tries to get the same file name under CREDENTIAL_DIRECTORY. The credential list should contains actual credential entries. The sample broker look up the device uuid from the list to get the credential. Similarly, a credential entry with key "default" indicates the fallback credental.

The following example shows how the credential information is organized in Secret and ConfigMap. There are 4 credentials specified in this example, credential for device id "5f5a69c2-e0ae-504f-829b-00fcdab169cc", "3fa1fe68-b915-4053-a3e1-ac15a21f5f91", "6a67158b-42b1-400b-8afe-1bec9a5d7909" and a fallback credential "username_default"/"password_default".

apiVersion: v1
kind: ConfigMap
metadata:
  name: onvif-auth-configmap
data:
  device_credential_ref_list: |+ 
    [ "credential_ref_list1" ]
  credential_ref_list1: |+
    {
        "5f5a69c2-e0ae-504f-829b-00fcdab169cc":
            {
                "username_ref" : "device2_username",
                "password_ref" : "device2_password"
            }
    }
---
apiVersion: v1
kind: Secret
metadata:
  name: onvif-auth-secret
type: Opaque
stringData:
  device_credential_list: |+ 
    [ "credential_list" ]
  credential_list: |+
    {
        "3fa1fe68-b915-4053-a3e1-ac15a21f5f91" :
            {
                "username" : "user1",
                "password" : "SGFwcHlEYXk=",
                "base64encoded": true
            }
    }
  username_6a67158b_42b1_400b_8afe_1bec9a5d7909: "admin"
  password_6a67158b_42b1_400b_8afe_1bec9a5d7909: "admin"
  device2_username: "user2"
  device2_password: "abcde"
  username_default: "user1"
  password_default: "12345"

Modifying a Configuration

Akri has provided further documentation on modifying the broker PodSpec, instanceServiceSpec, or configurationServiceSpec More information about how to modify an installed Configuration, add additional Configurations to a cluster, or delete a Configuration can be found in the Customizing an Akri Installation document.

Implementation details

The ONVIF implementation can be understood by looking at several things:

OnvifDiscoveryDetails defines the required properties
OnvifDiscoveryHandler defines ONVIF camera discovery
samples/brokers/onvif-video-broker defines the ONVIF broker

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