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Core now installs a shared CA to be be used by cluster microservices making key distribution easier. Use that rather than self-signing.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| /* | ||
| Copyright 2024 the Unikorn Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package client | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "errors" | ||
| "fmt" | ||
| "net/http" | ||
|
|
||
| "github.com/spf13/pflag" | ||
| "go.opentelemetry.io/otel" | ||
| "go.opentelemetry.io/otel/propagation" | ||
|
|
||
| "github.com/unikorn-cloud/core/pkg/authorization/accesstoken" | ||
| "github.com/unikorn-cloud/region/pkg/openapi" | ||
|
|
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| corev1 "k8s.io/api/core/v1" | ||
|
|
||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| ) | ||
|
|
||
| var ( | ||
| // ErrFormatError is returned when a secret doesn't meet the specification. | ||
| ErrFormatError = errors.New("secret incorrectly formatted") | ||
| ) | ||
|
|
||
| // Client wraps up the raw OpenAPI client with things to make it useable e.g. | ||
| // authorization and TLS. | ||
| type Client struct { | ||
| // client is a Kubenetes client. | ||
| client client.Client | ||
| // namespace is the namespace the client is running in. | ||
| namespace string | ||
| // host is the region host name. | ||
| host string | ||
| // caSecretNamespace tells us where to source the CA secret. | ||
| caSecretNamespace string | ||
| // caSecretName is the root CA secret of the region endpoint. | ||
| caSecretName string | ||
| } | ||
|
|
||
| // New creates a new client. | ||
| func New(client client.Client, namespace string) *Client { | ||
| return &Client{ | ||
| client: client, | ||
| namespace: namespace, | ||
| } | ||
| } | ||
|
|
||
| // AddFlags adds the options to the CLI flags. | ||
| func (c *Client) AddFlags(f *pflag.FlagSet) { | ||
| f.StringVar(&c.host, "region-host", "", "Region endpoint URL.") | ||
| f.StringVar(&c.caSecretNamespace, "region-ca-secret-namespace", "", "Region endpoint CA certificate secret namespace.") | ||
| f.StringVar(&c.caSecretName, "region-ca-secret-name", "", "Region endpoint CA certificate secret.") | ||
| } | ||
|
|
||
| // tlsClientConfig abstracts away private TLS CAs or self signed certificates. | ||
| func (c *Client) tlsClientConfig(ctx context.Context) (*tls.Config, error) { | ||
| if c.caSecretName == "" { | ||
| //nolint:nilnil | ||
| return nil, nil | ||
| } | ||
|
|
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| namespace := c.namespace | ||
|
|
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| if c.caSecretNamespace != "" { | ||
| namespace = c.caSecretNamespace | ||
| } | ||
|
|
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| secret := &corev1.Secret{} | ||
|
|
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| if err := c.client.Get(ctx, client.ObjectKey{Namespace: namespace, Name: c.caSecretName}, secret); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if secret.Type != corev1.SecretTypeTLS { | ||
| return nil, fmt.Errorf("%w: issuer CA not of type kubernetes.io/tls", ErrFormatError) | ||
| } | ||
|
|
||
| cert, ok := secret.Data[corev1.TLSCertKey] | ||
| if !ok { | ||
| return nil, fmt.Errorf("%w: issuer CA missing tls.crt", ErrFormatError) | ||
| } | ||
|
|
||
| certPool := x509.NewCertPool() | ||
|
|
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| if ok := certPool.AppendCertsFromPEM(cert); !ok { | ||
| return nil, fmt.Errorf("%w: failed to load region CA certificate", ErrFormatError) | ||
| } | ||
|
|
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| config := &tls.Config{ | ||
| RootCAs: certPool, | ||
| MinVersion: tls.VersionTLS13, | ||
| } | ||
|
|
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| return config, nil | ||
| } | ||
|
|
||
| // httpClient returns a new http client that will transparently do oauth2 header | ||
| // injection and refresh token updates. | ||
| func (c *Client) httpClient(ctx context.Context) (*http.Client, error) { | ||
| // Handle non-system CA certificates for the OIDC discovery protocol | ||
| // and oauth2 token refresh. This will return nil if none is specified | ||
| // and default to the system roots. | ||
| tlsClientConfig, err := c.tlsClientConfig(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| client := &http.Client{ | ||
| Transport: &http.Transport{ | ||
| TLSClientConfig: tlsClientConfig, | ||
| }, | ||
| } | ||
|
|
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| return client, nil | ||
| } | ||
|
|
||
| // accessTokenInjector implements OAuth2 bearer token authorization. | ||
| func accessTokenInjector(ctx context.Context, req *http.Request) error { | ||
| req.Header.Set("Authorization", "bearer "+accesstoken.FromContext(ctx)) | ||
|
|
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| otel.GetTextMapPropagator().Inject(ctx, propagation.HeaderCarrier(req.Header)) | ||
|
|
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| return nil | ||
| } | ||
|
|
||
| // Client returns a new OpenAPI client that can be used to access the API. | ||
| func (c *Client) Client(ctx context.Context) (*openapi.ClientWithResponses, error) { | ||
| httpClient, err := c.httpClient(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| client, err := openapi.NewClientWithResponses(c.host, openapi.WithHTTPClient(httpClient), openapi.WithRequestEditorFn(accessTokenInjector)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return client, nil | ||
| } |
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