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Merge pull request #274 from dlom/CCO-320
CCO-320: Add support for Azure workload identity tokens
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| /* | ||
| Copyright 2023 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" | ||
| ) | ||
|
|
||
| /* | ||
| For workload identity to work we need the following. | ||
| |-----------------------------------------------------------------------------------| | ||
| |AZURE_AUTHORITY_HOST | The Azure Active Directory (AAD) endpoint. | | ||
| |AZURE_CLIENT_ID | The 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. | | ||
| |-----------------------------------------------------------------------------------| | ||
| With the current implementation, AZURE_CLIENT_ID and AZURE_TENANT_ID are read via AzureClusterIdentity | ||
| object and fallback to reading from env variables if not found on AzureClusterIdentity. | ||
| AZURE_FEDERATED_TOKEN_FILE is the path of the projected service account token which is by default | ||
| "/var/run/secrets/azure/tokens/azure-identity-token". | ||
| The path can be overridden by setting "AZURE_FEDERATED_TOKEN_FILE" env variable. | ||
| */ | ||
|
|
||
| const ( | ||
| // azureFederatedTokenFileEnvKey is the env key for AZURE_FEDERATED_TOKEN_FILE. | ||
| azureFederatedTokenFileEnvKey = "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" | ||
| // azureTokenFilePath is the path of the projected token. | ||
| azureTokenFilePath = "/var/run/secrets/azure/tokens/azure-identity-token" // #nosec G101 | ||
| // azureFederatedTokenFileRefreshTime is the time interval after which it should be read again. | ||
| azureFederatedTokenFileRefreshTime = 5 * time.Minute | ||
| ) | ||
|
|
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| type workloadIdentityCredential struct { | ||
| assertion string | ||
| file string | ||
| cred *azidentity.ClientAssertionCredential | ||
| lastRead time.Time | ||
| } | ||
|
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| // WorkloadIdentityCredentialOptions contains the configurable options for azwi. | ||
| type WorkloadIdentityCredentialOptions struct { | ||
| azcore.ClientOptions | ||
| ClientID string | ||
| TenantID string | ||
| TokenFilePath string | ||
| } | ||
|
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| // NewWorkloadIdentityCredentialOptions returns an empty instance of WorkloadIdentityCredentialOptions. | ||
| func NewWorkloadIdentityCredentialOptions() *WorkloadIdentityCredentialOptions { | ||
| return &WorkloadIdentityCredentialOptions{} | ||
| } | ||
|
|
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| // WithClientID sets client ID to WorkloadIdentityCredentialOptions. | ||
| func (w *WorkloadIdentityCredentialOptions) WithClientID(clientID string) *WorkloadIdentityCredentialOptions { | ||
| w.ClientID = strings.TrimSpace(clientID) | ||
| return w | ||
| } | ||
|
|
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| // WithTenantID sets tenant ID to WorkloadIdentityCredentialOptions. | ||
| func (w *WorkloadIdentityCredentialOptions) WithTenantID(tenantID string) *WorkloadIdentityCredentialOptions { | ||
| w.TenantID = strings.TrimSpace(tenantID) | ||
| return w | ||
| } | ||
|
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| // getProjectedTokenPath return projected token file path from the env variable. | ||
| func getProjectedTokenPath() string { | ||
| tokenPath := strings.TrimSpace(os.Getenv(azureFederatedTokenFileEnvKey)) | ||
| if tokenPath == "" { | ||
| return azureTokenFilePath | ||
| } | ||
| return tokenPath | ||
| } | ||
|
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| // 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) { | ||
| w.TokenFilePath = getProjectedTokenPath() | ||
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| // Fallback to using client ID from env variable if not set. | ||
| if w.ClientID == "" { | ||
| w.ClientID = strings.TrimSpace(os.Getenv(azureClientIDEnvKey)) | ||
| if w.ClientID == "" { | ||
| return nil, errors.New("empty client ID") | ||
| } | ||
| } | ||
|
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| // Fallback to using tenant ID from env variable. | ||
| if w.TenantID == "" { | ||
| w.TenantID = strings.TrimSpace(os.Getenv(azureTenantIDEnvKey)) | ||
| if w.TenantID == "" { | ||
| return nil, errors.New("empty tenant ID") | ||
| } | ||
| } | ||
| return w, nil | ||
| } | ||
|
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| // NewWorkloadIdentityCredential returns a workload identity credential. | ||
| func NewWorkloadIdentityCredential(options *WorkloadIdentityCredentialOptions) (azcore.TokenCredential, 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 | ||
| } | ||
|
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| // 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) | ||
| } | ||
|
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| func (w *workloadIdentityCredential) getAssertion(context.Context) (string, error) { | ||
| if now := time.Now(); w.lastRead.Add(azureFederatedTokenFileRefreshTime).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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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,6 @@ | ||
| apiVersion: v1 | ||
| kind: ServiceAccount | ||
| metadata: | ||
| labels: | ||
| name: manager | ||
| namespace: system | ||
| namespace: system |
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