104 lines
3.8 KiB
Go
104 lines
3.8 KiB
Go
/*
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Copyright 2023 The Flux authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package azkv
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import (
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"errors"
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"fmt"
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"os"
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"strings"
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"github.com/Azure/azure-sdk-for-go/sdk/azcore"
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"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
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)
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// DefaultTokenCredential is a modification of azidentity.NewDefaultAzureCredential,
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// specifically adapted to not shell out to the Azure CLI.
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//
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// It attempts to return an azcore.TokenCredential based on the following order:
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//
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// - azidentity.NewEnvironmentCredential if environment variables AZURE_CLIENT_ID,
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// AZURE_CLIENT_ID is set with either one of the following: (AZURE_CLIENT_SECRET)
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// or (AZURE_CLIENT_CERTIFICATE_PATH and AZURE_CLIENT_CERTIFICATE_PATH) or
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// (AZURE_USERNAME, AZURE_PASSWORD)
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// - azidentity.WorkloadIdentityCredential if environment variable configuration
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// (AZURE_AUTHORITY_HOST, AZURE_CLIENT_ID, AZURE_FEDERATED_TOKEN_FILE, AZURE_TENANT_ID)
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// is set by the Azure workload identity webhook.
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// - azidentity.ManagedIdentityCredential if only AZURE_CLIENT_ID env variable is set.
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func DefaultTokenCredential() (azcore.TokenCredential, error) {
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var (
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azureClientID = "AZURE_CLIENT_ID"
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azureFederatedTokenFile = "AZURE_FEDERATED_TOKEN_FILE"
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azureAuthorityHost = "AZURE_AUTHORITY_HOST"
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azureTenantID = "AZURE_TENANT_ID"
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)
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var errorMessages []string
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options := &azidentity.DefaultAzureCredentialOptions{}
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envCred, err := azidentity.NewEnvironmentCredential(&azidentity.EnvironmentCredentialOptions{
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ClientOptions: options.ClientOptions, DisableInstanceDiscovery: options.DisableInstanceDiscovery},
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)
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if err == nil {
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return envCred, nil
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} else {
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errorMessages = append(errorMessages, "EnvironmentCredential: "+err.Error())
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}
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// workload identity requires values for AZURE_AUTHORITY_HOST, AZURE_CLIENT_ID, AZURE_FEDERATED_TOKEN_FILE, AZURE_TENANT_ID
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haveWorkloadConfig := false
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clientID, haveClientID := os.LookupEnv(azureClientID)
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if haveClientID {
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if file, ok := os.LookupEnv(azureFederatedTokenFile); ok {
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if _, ok := os.LookupEnv(azureAuthorityHost); ok {
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if tenantID, ok := os.LookupEnv(azureTenantID); ok {
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haveWorkloadConfig = true
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workloadCred, err := azidentity.NewWorkloadIdentityCredential(&azidentity.WorkloadIdentityCredentialOptions{
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ClientID: clientID,
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TenantID: tenantID,
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TokenFilePath: file,
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ClientOptions: options.ClientOptions,
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DisableInstanceDiscovery: options.DisableInstanceDiscovery,
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})
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if err == nil {
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return workloadCred, nil
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} else {
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errorMessages = append(errorMessages, "Workload Identity"+": "+err.Error())
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}
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}
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}
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}
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}
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if !haveWorkloadConfig {
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err := errors.New("missing environment variables for workload identity. Check webhook and pod configuration")
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errorMessages = append(errorMessages, fmt.Sprintf("Workload Identity: %s", err))
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}
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o := &azidentity.ManagedIdentityCredentialOptions{ClientOptions: options.ClientOptions}
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if haveClientID {
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o.ID = azidentity.ClientID(clientID)
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}
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miCred, err := azidentity.NewManagedIdentityCredential(o)
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if err == nil {
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return miCred, nil
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} else {
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errorMessages = append(errorMessages, "ManagedIdentity"+": "+err.Error())
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}
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return nil, errors.New(strings.Join(errorMessages, "\n"))
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}
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