resources.certificateSigningRequests

CertificateSigningRequest objects provide a mechanism to obtain x509 certificates by submitting a certificate signing request, and having it asynchronously approved and issued.

Kubelets use this API to obtain:

  1. client certificates to authenticate to kube-apiserver (with the “kubernetes.io/kube-apiserver-client-kubelet” signerName).
  2. serving certificates for TLS endpoints kube-apiserver can connect to securely (with the “kubernetes.io/kubelet-serving” signerName).

This API can be used to request client certificates to authenticate to kube-apiserver (with the “kubernetes.io/kube-apiserver-client” signerName), or to obtain certificates from custom non-Kubernetes signers.

Type: attribute set of (submodule)

Default: { }

Declared by:

resources.certificateSigningRequests.<name>.apiVersion

APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.kind

Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata

Type: null or (submodule)

Declared by:

resources.certificateSigningRequests.<name>.metadata.annotations

Annotations is an unstructured key value map stored with a resource that may be set by external tools to store and retrieve arbitrary metadata. They are not queryable and should be preserved when modifying objects. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations

Type: null or (attribute set of (string))

Declared by:

resources.certificateSigningRequests.<name>.metadata.creationTimestamp

CreationTimestamp is a timestamp representing the server time when this object was created. It is not guaranteed to be set in happens-before order across separate operations. Clients may not set this value. It is represented in RFC3339 form and is in UTC.

Populated by the system. Read-only. Null for lists. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.deletionGracePeriodSeconds

Number of seconds allowed for this object to gracefully terminate before it will be removed from the system. Only set when deletionTimestamp is also set. May only be shortened. Read-only.

Type: null or signed integer

Declared by:

resources.certificateSigningRequests.<name>.metadata.deletionTimestamp

DeletionTimestamp is RFC 3339 date and time at which this resource will be deleted. This field is set by the server when a graceful deletion is requested by the user, and is not directly settable by a client. The resource is expected to be deleted (no longer visible from resource lists, and not reachable by name) after the time in this field, once the finalizers list is empty. As long as the finalizers list contains items, deletion is blocked. Once the deletionTimestamp is set, this value may not be unset or be set further into the future, although it may be shortened or the resource may be deleted prior to this time. For example, a user may request that a pod is deleted in 30 seconds. The Kubelet will react by sending a graceful termination signal to the containers in the pod. After that 30 seconds, the Kubelet will send a hard termination signal (SIGKILL) to the container and after cleanup, remove the pod from the API. In the presence of network partitions, this object may still exist after this timestamp, until an administrator or automated process can determine the resource is fully terminated. If not set, graceful deletion of the object has not been requested.

Populated by the system when a graceful deletion is requested. Read-only. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.finalizers

Must be empty before the object is deleted from the registry. Each entry is an identifier for the responsible component that will remove the entry from the list. If the deletionTimestamp of the object is non-nil, entries in this list can only be removed. Finalizers may be processed and removed in any order. Order is NOT enforced because it introduces significant risk of stuck finalizers. finalizers is a shared field, any actor with permission can reorder it. If the finalizer list is processed in order, then this can lead to a situation in which the component responsible for the first finalizer in the list is waiting for a signal (field value, external system, or other) produced by a component responsible for a finalizer later in the list, resulting in a deadlock. Without enforced ordering finalizers are free to order amongst themselves and are not vulnerable to ordering changes in the list.

Type: null or (list of (string))

Declared by:

resources.certificateSigningRequests.<name>.metadata.generateName

GenerateName is an optional prefix, used by the server, to generate a unique name ONLY IF the Name field has not been provided. If this field is used, the name returned to the client will be different than the name passed. This value will also be combined with a unique suffix. The provided value has the same validation rules as the Name field, and may be truncated by the length of the suffix required to make the value unique on the server.

If this field is specified and the generated name exists, the server will return a 409.

Applied only if Name is not specified. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#idempotency

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.generation

A sequence number representing a specific generation of the desired state. Populated by the system. Read-only.

Type: null or signed integer

Declared by:

resources.certificateSigningRequests.<name>.metadata.labels

Map of string keys and values that can be used to organize and categorize (scope and select) objects. May match selectors of replication controllers and services. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels

Type: null or (attribute set of (string))

Declared by:

resources.certificateSigningRequests.<name>.metadata.managedFields

ManagedFields maps workflow-id and version to the set of fields that are managed by that workflow. This is mostly for internal housekeeping, and users typically shouldn’t need to set or understand this field. A workflow can be the user’s name, a controller’s name, or the name of a specific apply path like “ci-cd”. The set of fields is always in the version that the workflow used when modifying the object.

Type: null or (list of (submodule))

Declared by:

resources.certificateSigningRequests.<name>.metadata.managedFields.*.apiVersion

APIVersion defines the version of this resource that this field set applies to. The format is “group/version” just like the top-level APIVersion field. It is necessary to track the version of a field set because it cannot be automatically converted.

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.managedFields.*.fieldsType

FieldsType is the discriminator for the different fields format and version. There is currently only one possible value: “FieldsV1”

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.managedFields.*.fieldsV1

FieldsV1 holds the first JSON version format as described in the “FieldsV1” type.

Type: null or (submodule)

Declared by:

resources.certificateSigningRequests.<name>.metadata.managedFields.*.manager

Manager is an identifier of the workflow managing these fields.

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.managedFields.*.operation

Operation is the type of operation which lead to this ManagedFieldsEntry being created. The only valid values for this field are ‘Apply’ and ‘Update’.

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.managedFields.*.subresource

Subresource is the name of the subresource used to update that object, or empty string if the object was updated through the main resource. The value of this field is used to distinguish between managers, even if they share the same name. For example, a status update will be distinct from a regular update using the same manager name. Note that the APIVersion field is not related to the Subresource field and it always corresponds to the version of the main resource.

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.managedFields.*.time

Time is the timestamp of when the ManagedFields entry was added. The timestamp will also be updated if a field is added, the manager changes any of the owned fields value or removes a field. The timestamp does not update when a field is removed from the entry because another manager took it over.

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.name

Name must be unique within a namespace. Is required when creating resources, although some resources may allow a client to request the generation of an appropriate name automatically. Name is primarily intended for creation idempotence and configuration definition. Cannot be updated. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names#names

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.namespace

Namespace defines the space within which each name must be unique. An empty namespace is equivalent to the “default” namespace, but “default” is the canonical representation. Not all objects are required to be scoped to a namespace - the value of this field for those objects will be empty.

Must be a DNS_LABEL. Cannot be updated. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.ownerReferences

List of objects depended by this object. If ALL objects in the list have been deleted, this object will be garbage collected. If this object is managed by a controller, then an entry in this list will point to this controller, with the controller field set to true. There cannot be more than one managing controller.

Type: null or (attribute set of (submodule) or list of (submodule))

Declared by:

resources.certificateSigningRequests.<name>.metadata.ownerReferences.<name>._priority

This option has no description.

Type: null or signed integer

Default: null

Declared by:

resources.certificateSigningRequests.<name>.metadata.ownerReferences.<name>.apiVersion

API version of the referent.

Type: string

Declared by:

resources.certificateSigningRequests.<name>.metadata.ownerReferences.<name>.blockOwnerDeletion

If true, AND if the owner has the “foregroundDeletion” finalizer, then the owner cannot be deleted from the key-value store until this reference is removed. See https://kubernetes.io/docs/concepts/architecture/garbage-collection/#foreground-deletion for how the garbage collector interacts with this field and enforces the foreground deletion. Defaults to false. To set this field, a user needs “delete” permission of the owner, otherwise 422 (Unprocessable Entity) will be returned.

Type: null or boolean

Declared by:

resources.certificateSigningRequests.<name>.metadata.ownerReferences.<name>.controller

If true, this reference points to the managing controller.

Type: null or boolean

Declared by:

resources.certificateSigningRequests.<name>.metadata.ownerReferences.<name>.kind

Kind of the referent. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds

Type: string

Declared by:

resources.certificateSigningRequests.<name>.metadata.ownerReferences.<name>.name

Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names#names

Type: string

Declared by:

resources.certificateSigningRequests.<name>.metadata.ownerReferences.<name>.uid

UID of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names#uids

Type: string

Declared by:

resources.certificateSigningRequests.<name>.metadata.resourceVersion

An opaque value that represents the internal version of this object that can be used by clients to determine when objects have changed. May be used for optimistic concurrency, change detection, and the watch operation on a resource or set of resources. Clients must treat these values as opaque and passed unmodified back to the server. They may only be valid for a particular resource or set of resources.

Populated by the system. Read-only. Value must be treated as opaque by clients and . More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#concurrency-control-and-consistency

Type: null or (string)

Declared by:

Deprecated: selfLink is a legacy read-only field that is no longer populated by the system.

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.metadata.uid

UID is the unique in time and space value for this object. It is typically generated by the server on successful creation of a resource and is not allowed to change on PUT operations.

Populated by the system. Read-only. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names#uids

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.spec

spec contains the certificate request, and is immutable after creation. Only the request, signerName, expirationSeconds, and usages fields can be set on creation. Other fields are derived by Kubernetes and cannot be modified by users.

Type: submodule

Declared by:

resources.certificateSigningRequests.<name>.spec.expirationSeconds

expirationSeconds is the requested duration of validity of the issued certificate. The certificate signer may issue a certificate with a different validity duration so a client must check the delta between the notBefore and and notAfter fields in the issued certificate to determine the actual duration.

The v1.22+ in-tree implementations of the well-known Kubernetes signers will honor this field as long as the requested duration is not greater than the maximum duration they will honor per the --cluster-signing-duration CLI flag to the Kubernetes controller manager.

Certificate signers may not honor this field for various reasons:

  1. Old signer that is unaware of the field (such as the in-tree implementations prior to v1.22)
  2. Signer whose configured maximum is shorter than the requested duration
  3. Signer whose configured minimum is longer than the requested duration

The minimum valid value for expirationSeconds is 600, i.e. 10 minutes.

Type: null or signed integer

Declared by:

resources.certificateSigningRequests.<name>.spec.extra

extra contains extra attributes of the user that created the CertificateSigningRequest. Populated by the API server on creation and immutable.

Type: null or (attribute set of (string))

Declared by:

resources.certificateSigningRequests.<name>.spec.groups

groups contains group membership of the user that created the CertificateSigningRequest. Populated by the API server on creation and immutable.

Type: null or (list of (string))

Declared by:

resources.certificateSigningRequests.<name>.spec.request

request contains an x509 certificate signing request encoded in a “CERTIFICATE REQUEST” PEM block. When serialized as JSON or YAML, the data is additionally base64-encoded.

Type: string

Declared by:

resources.certificateSigningRequests.<name>.spec.signerName

signerName indicates the requested signer, and is a qualified name.

List/watch requests for CertificateSigningRequests can filter on this field using a “spec.signerName=NAME” fieldSelector.

Well-known Kubernetes signers are:

  1. “kubernetes.io/kube-apiserver-client”: issues client certificates that can be used to authenticate to kube-apiserver. Requests for this signer are never auto-approved by kube-controller-manager, can be issued by the “csrsigning” controller in kube-controller-manager.
  2. “kubernetes.io/kube-apiserver-client-kubelet”: issues client certificates that kubelets use to authenticate to kube-apiserver. Requests for this signer can be auto-approved by the “csrapproving” controller in kube-controller-manager, and can be issued by the “csrsigning” controller in kube-controller-manager.
  3. “kubernetes.io/kubelet-serving” issues serving certificates that kubelets use to serve TLS endpoints, which kube-apiserver can connect to securely. Requests for this signer are never auto-approved by kube-controller-manager, and can be issued by the “csrsigning” controller in kube-controller-manager.

More details are available at https://k8s.io/docs/reference/access-authn-authz/certificate-signing-requests/#kubernetes-signers

Custom signerNames can also be specified. The signer defines:

  1. Trust distribution: how trust (CA bundles) are distributed.
  2. Permitted subjects: and behavior when a disallowed subject is requested.
  3. Required, permitted, or forbidden x509 extensions in the request (including whether subjectAltNames are allowed, which types, restrictions on allowed values) and behavior when a disallowed extension is requested.
  4. Required, permitted, or forbidden key usages / extended key usages.
  5. Expiration/certificate lifetime: whether it is fixed by the signer, configurable by the admin.
  6. Whether or not requests for CA certificates are allowed.

Type: string

Declared by:

resources.certificateSigningRequests.<name>.spec.uid

uid contains the uid of the user that created the CertificateSigningRequest. Populated by the API server on creation and immutable.

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.spec.usages

usages specifies a set of key usages requested in the issued certificate.

Requests for TLS client certificates typically request: “digital signature”, “key encipherment”, “client auth”.

Requests for TLS serving certificates typically request: “key encipherment”, “digital signature”, “server auth”.

Valid values are: “signing”, “digital signature”, “content commitment”, “key encipherment”, “key agreement”, “data encipherment”, “cert sign”, “crl sign”, “encipher only”, “decipher only”, “any”, “server auth”, “client auth”, “code signing”, “email protection”, “s/mime”, “ipsec end system”, “ipsec tunnel”, “ipsec user”, “timestamping”, “ocsp signing”, “microsoft sgc”, “netscape sgc”

Type: null or (list of (string))

Declared by:

resources.certificateSigningRequests.<name>.spec.username

username contains the name of the user that created the CertificateSigningRequest. Populated by the API server on creation and immutable.

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.status

status contains information about whether the request is approved or denied, and the certificate issued by the signer, or the failure condition indicating signer failure.

Type: null or (submodule)

Declared by:

resources.certificateSigningRequests.<name>.status.certificate

certificate is populated with an issued certificate by the signer after an Approved condition is present. This field is set via the /status subresource. Once populated, this field is immutable.

If the certificate signing request is denied, a condition of type “Denied” is added and this field remains empty. If the signer cannot issue the certificate, a condition of type “Failed” is added and this field remains empty.

Validation requirements:

  1. certificate must contain one or more PEM blocks.
  2. All PEM blocks must have the “CERTIFICATE” label, contain no headers, and the encoded data must be a BER-encoded ASN.1 Certificate structure as described in section 4 of RFC5280.
  3. Non-PEM content may appear before or after the “CERTIFICATE” PEM blocks and is unvalidated, to allow for explanatory text as described in section 5.2 of RFC7468.

If more than one PEM block is present, and the definition of the requested spec.signerName does not indicate otherwise, the first block is the issued certificate, and subsequent blocks should be treated as intermediate certificates and presented in TLS handshakes.

The certificate is encoded in PEM format.

When serialized as JSON or YAML, the data is additionally base64-encoded, so it consists of:

base64(
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
)

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.status.conditions

conditions applied to the request. Known conditions are “Approved”, “Denied”, and “Failed”.

Type: null or (list of (submodule))

Declared by:

resources.certificateSigningRequests.<name>.status.conditions.*.lastTransitionTime

lastTransitionTime is the time the condition last transitioned from one status to another. If unset, when a new condition type is added or an existing condition’s status is changed, the server defaults this to the current time.

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.status.conditions.*.lastUpdateTime

lastUpdateTime is the time of the last update to this condition

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.status.conditions.*.message

message contains a human readable message with details about the request state

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.status.conditions.*.reason

reason indicates a brief reason for the request state

Type: null or (string)

Declared by:

resources.certificateSigningRequests.<name>.status.conditions.*.status

status of the condition, one of True, False, Unknown. Approved, Denied, and Failed conditions may not be “False” or “Unknown”.

Type: string

Declared by:

resources.certificateSigningRequests.<name>.status.conditions.*.type

type of the condition. Known conditions are “Approved”, “Denied”, and “Failed”.

An “Approved” condition is added via the /approval subresource, indicating the request was approved and should be issued by the signer.

A “Denied” condition is added via the /approval subresource, indicating the request was denied and should not be issued by the signer.

A “Failed” condition is added via the /status subresource, indicating the signer failed to issue the certificate.

Approved and Denied conditions are mutually exclusive. Approved, Denied, and Failed conditions cannot be removed once added.

Only one condition of a given type is allowed.

Type: string

Declared by: