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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| /* | ||
| Copyright 2022 The Kubernetes 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 scope | ||
|
|
||
| import ( | ||
| "context" | ||
| "os" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/Azure/azure-sdk-for-go/sdk/azcore" | ||
| "github.com/Azure/azure-sdk-for-go/sdk/azcore/policy" | ||
| "github.com/Azure/azure-sdk-for-go/sdk/azidentity" | ||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| /* | ||
| AZWI (Azure Workload Identity) required deploying AZWI mutating admission webhook | ||
| for self managed clusters e.g. Kind. | ||
| The webhook injects the following environment variables to the pod that | ||
| uses a service account with a annotation `azure.workload.identity/use=true` | ||
| |-----------------------------------------------------------------------------------| | ||
| |AZURE_AUTHORITY_HOST | The Azure Active Directory (AAD) endpoint. | | ||
| |AZURE_CLIENT_ID | The application/client ID of the Azure AD | | ||
| | | application or user-assigned managed identity. | | ||
| |AZURE_TENANT_ID | The tenant ID of the Azure subscription. | | ||
| |AZURE_FEDERATED_TOKEN_FILE | The path of the projected service account token file. | | ||
| |-----------------------------------------------------------------------------------| | ||
| In addition to the service account, it also projects a signed service account token to the | ||
| workload's volume(in this case the capz pod). The volume name is `azure-identity-token` | ||
| which is mounted at path `/var/run/secrets/azure/tokens/azure-identity-token` to the pod. | ||
| */ | ||
|
|
||
| const ( | ||
| // AzureFedratedTokenFileENVKey is the env key for AZURE_FEDERATED_TOKEN_FILE. | ||
| AzureFedratedTokenFileENVKey = "AZURE_FEDERATED_TOKEN_FILE" | ||
| // AzureClientIDENVKey is the env key for AZURE_CLIENT_ID. | ||
| AzureClientIDENVKey = "AZURE_CLIENT_ID" | ||
| // AzureTenantIDENVKey is the env key for AZURE_TENANT_ID. | ||
| AzureTenantIDENVKey = "AZURE_TENANT_ID" | ||
| ) | ||
|
|
||
| type workloadIdentityCredential struct { | ||
| assertion string | ||
| file string | ||
| cred *azidentity.ClientAssertionCredential | ||
| lastRead time.Time | ||
| } | ||
|
|
||
| // WorkloadIdentityCredentialOptions contains the configurable options for azwi. | ||
| type WorkloadIdentityCredentialOptions struct { | ||
| ClientID string | ||
| TenantID string | ||
| TokenFilePath string | ||
| azcore.ClientOptions | ||
| } | ||
|
|
||
| // NewWorkloadIdentityCredentialOptions returns an empty instance of WorkloadIdentityCredentialOptions. | ||
| func NewWorkloadIdentityCredentialOptions() *WorkloadIdentityCredentialOptions { | ||
| return &WorkloadIdentityCredentialOptions{} | ||
| } | ||
|
|
||
| // WithClientID sets client ID to WorkloadIdentityCredentialOptions. | ||
| func (w *WorkloadIdentityCredentialOptions) WithClientID(clientID string) *WorkloadIdentityCredentialOptions { | ||
| w.ClientID = clientID | ||
| return w | ||
| } | ||
|
|
||
| // WithTenantID sets tenant ID to WorkloadIdentityCredentialOptions. | ||
| func (w *WorkloadIdentityCredentialOptions) WithTenantID(tenantID string) *WorkloadIdentityCredentialOptions { | ||
| w.TenantID = tenantID | ||
| return w | ||
| } | ||
|
|
||
| // GetProjectedTokenPath return projected token file path from the env variable. | ||
| func GetProjectedTokenPath() (string, error) { | ||
| tokenPath := os.Getenv(AzureFedratedTokenFileENVKey) | ||
| if strings.TrimSpace(tokenPath) == "" { | ||
| return "", errors.New("projected token path not injected") | ||
| } | ||
| return tokenPath, nil | ||
| } | ||
|
|
||
| // WithDefaults sets token file path. It also sets the client tenant ID from injected env in | ||
| // case empty values are passed. | ||
| func (w *WorkloadIdentityCredentialOptions) WithDefaults() (*WorkloadIdentityCredentialOptions, error) { | ||
| tokenFilePath, err := GetProjectedTokenPath() | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "failed to get token file path for identity") | ||
| } | ||
| w.TokenFilePath = tokenFilePath | ||
|
|
||
| // Fallback to using client ID from env variable if not set. | ||
| if strings.TrimSpace(w.ClientID) == "" { | ||
| w.ClientID = os.Getenv(AzureClientIDENVKey) | ||
| if strings.TrimSpace(w.ClientID) == "" { | ||
| return nil, errors.New("empty client ID") | ||
| } | ||
| } | ||
|
|
||
| // // Fallback to using tenant ID from env variable. | ||
| if strings.TrimSpace(w.TenantID) == "" { | ||
| w.TenantID = os.Getenv(AzureTenantIDENVKey) | ||
| if strings.TrimSpace(w.TenantID) == "" { | ||
| return nil, errors.New("empty tenant ID") | ||
| } | ||
| } | ||
| return w, nil | ||
| } | ||
|
|
||
| // NewWorkloadIdentityCredential returns a workload identity credential. | ||
| func NewWorkloadIdentityCredential(options *WorkloadIdentityCredentialOptions) (*workloadIdentityCredential, error) { | ||
| w := &workloadIdentityCredential{file: options.TokenFilePath} | ||
| cred, err := azidentity.NewClientAssertionCredential(options.TenantID, options.ClientID, w.getAssertion, &azidentity.ClientAssertionCredentialOptions{ClientOptions: options.ClientOptions}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| w.cred = cred | ||
| return w, nil | ||
| } | ||
|
|
||
| // GetToken returns the token for azwi. | ||
| func (w *workloadIdentityCredential) GetToken(ctx context.Context, opts policy.TokenRequestOptions) (azcore.AccessToken, error) { | ||
| return w.cred.GetToken(ctx, opts) | ||
| } | ||
|
|
||
| func (w *workloadIdentityCredential) getAssertion(context.Context) (string, error) { | ||
| if now := time.Now(); w.lastRead.Add(5 * time.Minute).Before(now) { | ||
| content, err := os.ReadFile(w.file) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| w.assertion = string(content) | ||
| w.lastRead = now | ||
| } | ||
| return w.assertion, nil | ||
| } |
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