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WantsAuthorizer admission plugin support
The next step of PSP admission is to be able to limit the PSPs used based on user information. To do this the admission plugin would need to make authz checks for the `user.Info` in the request. This code allows a plugin to request the injection of an authorizer to allow it to make the authz checks.
Note: this could be done with a SAR, however since admission is running in the api server using the SAR would incur an extra hop vs using the authorizer directly.
@deads2k @derekwaynecarr
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clean api server cruft
Some cruft has developed over refactors. Remove that cruft.
@liggitt probably last in the chain so far
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Enable service account signing key rotation
fixes#21007
```release-note
The kube-apiserver --service-account-key-file option can be specified multiple times, or can point to a file containing multiple keys, to enable rotation of signing keys.
```
This PR enables the apiserver authenticator to verify service account tokens signed by different private keys. This can be done two different ways:
* including multiple keys in the specified keyfile (e.g. `--service-account-key-file=keys.pem`)
* specifying multiple key files (e.g. `--service-account-key-file current-key.pem --service-account-key-file=old-key.pem`)
This is part of enabling signing key rotation:
1. update apiserver(s) to verify tokens signed with a new public key while still allowing tokens signed with the current public key (which is what this PR enables)
2. give controllermanager the new private key to sign new tokens with
3. remove old service account tokens (determined by verifying signature or by checking creationTimestamp) once they are no longer in use (determined using garbage collection or magic) or some other algorithm (24 hours after rotation, etc). For the deletion to immediately revoke the token, `--service-account-lookup` must be enabled on the apiserver.
4. once all old tokens are gone, update apiservers again, removing the old public key.
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Set deserialization cache size based on target memory usage
**Special notes for your reviewer**:
This is the PR we talked about yesterday.
**Release note**:
```release-note
To reduce memory usage to reasonable levels in smaller clusters, kube-apiserver now sets the deserialization cache size based on the target memory usage.
```
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Allow anonymous API server access, decorate authenticated users with system:authenticated group
When writing authorization policy, it is often necessary to allow certain actions to any authenticated user. For example, creating a service or configmap, and granting read access to all users
It is also frequently necessary to allow actions to any unauthenticated user. For example, fetching discovery APIs might be part of an authentication process, and therefore need to be able to be read without access to authentication credentials.
This PR:
* Adds an option to allow anonymous requests to the secured API port. If enabled, requests to the secure port that are not rejected by other configured authentication methods are treated as anonymous requests, and given a username of `system:anonymous` and a group of `system:unauthenticated`. Note: this should only be used with an `--authorization-mode` other than `AlwaysAllow`
* Decorates user.Info returned from configured authenticators with the group `system:authenticated`.
This is related to defining a default set of roles and bindings for RBAC (https://github.com/kubernetes/features/issues/2). The bootstrap policy should allow all users (anonymous or authenticated) to request the discovery APIs.
```release-note
kube-apiserver learned the '--anonymous-auth' flag, which defaults to true. When enabled, requests to the secure port that are not rejected by other configured authentication methods are treated as anonymous requests, and given a username of 'system:anonymous' and a group of 'system:unauthenticated'.
Authenticated users are decorated with a 'system:authenticated' group.
NOTE: anonymous access is enabled by default. If you rely on authentication alone to authorize access, change to use an authorization mode other than AlwaysAllow, or or set '--anonymous-auth=false'.
```
c.f. https://github.com/kubernetes/kubernetes/issues/29177#issuecomment-244191596
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Allow secure access to apiserver from Admission Controllers
* Allow options.InsecurePort to be set to 0 to switch off insecure access
* In NewSelfClient, Set the TLSClientConfig to the cert and key files
if InsecurePort is switched off
* Mint a bearer token that allows the client(s) created in NewSelfClient
to talk to the api server
* Add a new authenticator that checks for this specific bearer token
Fixes#13598
* Allow options.InsecurePort to be set to 0 to switch off insecure access
* In NewSelfClient, Set the TLSClientConfig to the cert and key files
if InsecurePort is switched off
* Mint a bearer token that allows the client(s) created in NewSelfClient
to talk to the api server
* Add a new authenticator that checks for this specific bearer token
Fixes#13598
Automatic merge from submit-queue
Cleanup non-rest apiserver handlers
- rename MuxHelper -> PathRecorderMux
- move non-rest handlers into routes packages within genericapiserver and `pkg/routes` (those from master)
- move ui and logs handlers out of genericapiserver (they are
not generic)
- make version handler configurable (`config.EnableVersion`)
- rename MuxHelper -> PathRecorderMux
- move non-rest handlers into routes packages within genericapiserver and
`pkg/routes` (those from master)
- move ui and logs handlers out of genericapiserver (they are
not generic)
- make version handler configurable (`config.EnableVersion`)
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pkg/genericapiserver/options: don't import pkg/apiserver
Refactor the authorization options for the API server so
pkg/apiserver isn't directly imported by the options package.
Closes#28544
cc @smarterclayton
@madhusudancs, @nikhiljindal I've updated `federation/cmd/federation-apiserver/app/server.go` to include the RBAC options with this change. I don't know if this was intentionally left out in the first place but would like your feedback.
Automatic merge from submit-queue
make the resource prefix in etcd configurable for cohabitation
This looks big, its not as bad as it seems.
When you have different resources cohabiting, the resource name used for the etcd directory needs to be configurable. HPA in two different groups worked fine before. Now we're looking at something like RC<->RS. They normally store into two different etcd directories. This code allows them to be configured to store into the same location.
To maintain consistency across all resources, I allowed the `StorageFactory` to indicate which `ResourcePrefix` should be used inside `RESTOptions` which already contains storage information.
@lavalamp affects cohabitation.
@smarterclayton @mfojtik prereq for our rc<->rs and d<->dc story.
The codec factory should support two distinct interfaces - negotiating
for a serializer with a client, vs reading or writing data to a storage
form (etcd, disk, etc). Make the EncodeForVersion and DecodeToVersion
methods only take Encoder and Decoder, and slight refactoring elsewhere.
In the storage factory, use a content type to control what serializer to
pick, and use the universal deserializer. This ensures that storage can
read JSON (which might be from older objects) while only writing
protobuf. Add exceptions for those resources that may not be able to
write to protobuf (specifically third party resources, but potentially
others in the future).
