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login-add-eks-cluster-support (#1102)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,228 @@ | ||
| package login | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
||
| "github.com/giantswarm/k8sclient/v7/pkg/k8sclient" | ||
| "github.com/giantswarm/microerror" | ||
| "github.com/spf13/afero" | ||
| v1 "k8s.io/api/core/v1" | ||
| "k8s.io/client-go/tools/clientcmd" | ||
| clientcmdapi "k8s.io/client-go/tools/clientcmd/api" | ||
| eks "sigs.k8s.io/cluster-api-provider-aws/controlplane/eks/api/v1beta1" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| "sigs.k8s.io/yaml" | ||
|
|
||
| "github.com/giantswarm/kubectl-gs/v2/pkg/kubeconfig" | ||
| ) | ||
|
|
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| type eksClusterConfig struct { | ||
| clusterName string | ||
| certCA []byte | ||
| controlPlaneEndpoint string | ||
| filePath string | ||
| loginOptions LoginOptions | ||
| region string | ||
|
|
||
| awsProfileName string | ||
| } | ||
|
|
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| // storeWCClientCertCredentials saves the created client certificate credentials into the kubectl config. | ||
| func storeWCAWSIAMKubeconfig(k8sConfigAccess clientcmd.ConfigAccess, c eksClusterConfig, mcContextName string) (string, bool, error) { | ||
| config, err := k8sConfigAccess.GetStartingConfig() | ||
| if err != nil { | ||
| return "", false, microerror.Mask(err) | ||
| } | ||
|
|
||
| if mcContextName == "" { | ||
| mcContextName = config.CurrentContext | ||
| } | ||
| contextName := kubeconfig.GenerateWCAWSIAMKubeContextName(mcContextName, c.clusterName) | ||
| userName := fmt.Sprintf("%s-user", contextName) | ||
| clusterName := contextName | ||
|
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| contextExists := false | ||
|
|
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| { | ||
| // Create authenticated user. | ||
| user, exists := config.AuthInfos[userName] | ||
| if !exists { | ||
| user = clientcmdapi.NewAuthInfo() | ||
| } | ||
|
|
||
| user.Exec = awsIAMExec(c.clusterName, c.region) | ||
|
|
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| if c.awsProfileName != "" { | ||
| user.Exec.Env = []clientcmdapi.ExecEnvVar{ | ||
| { | ||
| Name: "AWS_DEFAULT_PROFILE", | ||
| Value: c.awsProfileName, | ||
| }, | ||
| } | ||
| } | ||
| // Add user information to config. | ||
| config.AuthInfos[userName] = user | ||
| } | ||
|
|
||
| { | ||
| // Create authenticated cluster. | ||
| cluster, exists := config.Clusters[clusterName] | ||
| if !exists { | ||
| cluster = clientcmdapi.NewCluster() | ||
| } | ||
|
|
||
| cluster.Server = c.controlPlaneEndpoint | ||
| cluster.CertificateAuthority = "" | ||
| cluster.CertificateAuthorityData = c.certCA | ||
|
|
||
| // Add cluster configuration to config. | ||
| config.Clusters[clusterName] = cluster | ||
| } | ||
|
|
||
| { | ||
| // Create authenticated context. | ||
| var context *clientcmdapi.Context | ||
| context, contextExists = config.Contexts[contextName] | ||
| if !contextExists { | ||
| context = clientcmdapi.NewContext() | ||
| } | ||
|
|
||
| context.Cluster = clusterName | ||
| context.AuthInfo = userName | ||
|
|
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| // Add context configuration to config. | ||
| config.Contexts[contextName] = context | ||
|
|
||
| // Select newly created context as current or revert to origin context if that is desired | ||
| if c.loginOptions.switchToWCContext { | ||
| config.CurrentContext = contextName | ||
| } else if c.loginOptions.originContext != "" { | ||
| config.CurrentContext = c.loginOptions.originContext | ||
| } | ||
| } | ||
|
|
||
| err = clientcmd.ModifyConfig(k8sConfigAccess, *config, false) | ||
| if err != nil { | ||
| return "", contextExists, microerror.Mask(err) | ||
| } | ||
|
|
||
| return contextName, contextExists, nil | ||
| } | ||
|
|
||
| // printWCAWSIamCredentials saves the created client certificate credentials into a separate kubectl config file. | ||
| func printWCAWSIamCredentials(k8sConfigAccess clientcmd.ConfigAccess, fs afero.Fs, c eksClusterConfig, mcContextName string) (string, bool, error) { | ||
| config, err := k8sConfigAccess.GetStartingConfig() | ||
| if err != nil { | ||
| return "", false, microerror.Mask(err) | ||
| } | ||
|
|
||
| if mcContextName == "" { | ||
| mcContextName = config.CurrentContext | ||
| } | ||
| contextName := kubeconfig.GenerateWCAWSIAMKubeContextName(mcContextName, c.clusterName) | ||
|
|
||
| kubeconfig := clientcmdapi.Config{ | ||
| APIVersion: "v1", | ||
| Kind: "Config", | ||
| Clusters: map[string]*clientcmdapi.Cluster{ | ||
| contextName: { | ||
| Server: c.controlPlaneEndpoint, | ||
| CertificateAuthorityData: c.certCA, | ||
| }, | ||
| }, | ||
| Contexts: map[string]*clientcmdapi.Context{ | ||
| contextName: { | ||
| Cluster: contextName, | ||
| AuthInfo: fmt.Sprintf("%s-user", contextName), | ||
| }, | ||
| }, | ||
| AuthInfos: map[string]*clientcmdapi.AuthInfo{ | ||
| fmt.Sprintf("%s-user", contextName): { | ||
| Exec: awsIAMExec(c.clusterName, c.region), | ||
| }, | ||
| }, | ||
| CurrentContext: contextName, | ||
| } | ||
| if c.awsProfileName != "" { | ||
| kubeconfig.AuthInfos[fmt.Sprintf("%s-user", contextName)].Exec.Env = []clientcmdapi.ExecEnvVar{ | ||
| { | ||
| Name: "AWS_DEFAULT_PROFILE", | ||
| Value: c.awsProfileName, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| err = mergeKubeconfigs(fs, c.filePath, kubeconfig, contextName) | ||
| if err != nil { | ||
| return "", false, microerror.Mask(err) | ||
| } | ||
|
|
||
| // Change back to the origin context if needed | ||
| if c.loginOptions.originContext != "" && config.CurrentContext != "" && c.loginOptions.originContext != config.CurrentContext { | ||
| // Because we are still in the MC context we need to switch back to the origin context after creating the WC kubeconfig file | ||
| config.CurrentContext = c.loginOptions.originContext | ||
| err = clientcmd.ModifyConfig(k8sConfigAccess, *config, false) | ||
| if err != nil { | ||
| return "", false, microerror.Mask(err) | ||
| } | ||
| } | ||
|
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| return contextName, false, nil | ||
| } | ||
|
|
||
| type kubeconfigFile struct { | ||
| Clusters []kubeCluster `json:"clusters"` | ||
| } | ||
|
|
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| type kubeCluster struct { | ||
| Cluster kubeClusterSpec `json:"cluster"` | ||
| } | ||
|
|
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| type kubeClusterSpec struct { | ||
| CertificateAuthorityData []byte `json:"certificate-authority-data"` | ||
| } | ||
|
|
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| func fetchEKSCAData(ctx context.Context, c k8sclient.Interface, clusterName string, clusterNamespace string) ([]byte, error) { | ||
| var secret v1.Secret | ||
| err := c.CtrlClient().Get(ctx, client.ObjectKey{Name: eksKubeconfigSecretName(clusterName), Namespace: clusterNamespace}, &secret) | ||
| if err != nil { | ||
| return nil, microerror.Mask(err) | ||
| } | ||
|
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| secretData := secret.Data["value"] | ||
|
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| kConfig := &kubeconfigFile{} | ||
|
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| err = yaml.Unmarshal(secretData, kConfig) | ||
| if err != nil { | ||
| return nil, microerror.Mask(err) | ||
| } | ||
| return kConfig.Clusters[0].Cluster.CertificateAuthorityData, err | ||
| } | ||
|
|
||
| func fetchEKSRegion(ctx context.Context, c k8sclient.Interface, clusterName string, clusterNamespace string) (string, error) { | ||
| var eksCluster eks.AWSManagedControlPlane | ||
| err := c.CtrlClient().Get(ctx, client.ObjectKey{Name: clusterName, Namespace: clusterNamespace}, &eksCluster) | ||
| if err != nil { | ||
| return "", microerror.Mask(err) | ||
| } | ||
|
|
||
| return eksCluster.Spec.Region, nil | ||
| } | ||
|
|
||
| func eksKubeconfigSecretName(clusterName string) string { | ||
| return fmt.Sprintf("%s-user-kubeconfig", clusterName) | ||
| } | ||
|
|
||
| func awsIAMExec(clusterName string, region string) *clientcmdapi.ExecConfig { | ||
| return &clientcmdapi.ExecConfig{ | ||
| APIVersion: "client.authentication.k8s.io/v1beta1", | ||
| Command: "aws", | ||
| Args: awsKubeconfigExecArgs(clusterName, region), | ||
| } | ||
| } | ||
|
|
||
| func awsKubeconfigExecArgs(clusterName string, region string) []string { | ||
| return []string{"--region", region, "eks", "get-token", "--cluster-name", clusterName, "--output", "json"} | ||
| } |
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