ceph-csi/vendor/github.com/Azure/azure-sdk-for-go/sdk/azidentity/MIGRATION.md

Migrating from autorest/adal to azidentity

azidentity provides Microsoft Entra ID (formerly Azure Active Directory) authentication for the newest Azure SDK modules (github.com/azure-sdk-for-go/sdk/...). Older Azure SDK packages (github.com/azure-sdk-for-go/services/...) use types from github.com/go-autorest/autorest/adal instead.

This guide shows common authentication code using autorest/adal and its equivalent using azidentity.

Table of contents

• Acquire a token
• Client certificate authentication
• Client secret authentication
• Configuration
• Device code authentication
• Managed identity
• Use azidentity credentials with older packages

Configuration

autorest/adal

Token providers require a token audience (resource identifier) and an instance of adal.OAuthConfig, which requires a Microsoft Entra endpoint and tenant:

import "github.com/Azure/go-autorest/autorest/adal"

oauthCfg, err := adal.NewOAuthConfig("https://login.chinacloudapi.cn", tenantID)
handle(err)

spt, err := adal.NewServicePrincipalTokenWithSecret(
    *oauthCfg, clientID, "https://management.chinacloudapi.cn/", &adal.ServicePrincipalTokenSecret{ClientSecret: secret},
)

azidentity

A credential instance can acquire tokens for any audience. The audience for each token is determined by the client requesting it. Credentials require endpoint configuration only for sovereign or private clouds. The azcore/cloud package has predefined configuration for sovereign clouds such as Azure China:

import (
    "github.com/Azure/azure-sdk-for-go/sdk/azcore/cloud"
    "github.com/Azure/azure-sdk-for-go/sdk/azidentity"
)

clientOpts := azcore.ClientOptions{Cloud: cloud.AzureChina}

cred, err := azidentity.NewClientSecretCredential(
    tenantID, clientID, secret, &azidentity.ClientSecretCredentialOptions{ClientOptions: clientOpts},
)
handle(err)

Client secret authentication

autorest/adal

import (
    "github.com/Azure/azure-sdk-for-go/services/resources/mgmt/2018-06-01/subscriptions"
    "github.com/Azure/go-autorest/autorest"
    "github.com/Azure/go-autorest/autorest/adal"
)

oauthCfg, err := adal.NewOAuthConfig("https://login.microsoftonline.com", tenantID)
handle(err)
spt, err := adal.NewServicePrincipalTokenWithSecret(
    *oauthCfg, clientID, "https://management.azure.com/", &adal.ServicePrincipalTokenSecret{ClientSecret: secret},
)
handle(err)

client := subscriptions.NewClient()
client.Authorizer = autorest.NewBearerAuthorizer(spt)

azidentity

import (
    "github.com/Azure/azure-sdk-for-go/sdk/azidentity"
    "github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resources/armsubscriptions"
)

cred, err := azidentity.NewClientSecretCredential(tenantID, clientID, secret, nil)
handle(err)

client, err := armsubscriptions.NewClient(cred, nil)
handle(err)

Client certificate authentication

autorest/adal

import (
    "os"

    "github.com/Azure/azure-sdk-for-go/services/resources/mgmt/2018-06-01/subscriptions"
    "github.com/Azure/go-autorest/autorest"
    "github.com/Azure/go-autorest/autorest/adal"
)
certData, err := os.ReadFile("./example.pfx")
handle(err)

certificate, rsaPrivateKey, err := decodePkcs12(certData, "")
handle(err)

oauthCfg, err := adal.NewOAuthConfig("https://login.microsoftonline.com", tenantID)
handle(err)

spt, err := adal.NewServicePrincipalTokenFromCertificate(
    *oauthConfig, clientID, certificate, rsaPrivateKey, "https://management.azure.com/",
)

client := subscriptions.NewClient()
client.Authorizer = autorest.NewBearerAuthorizer(spt)

azidentity

import (
    "os"

    "github.com/Azure/azure-sdk-for-go/sdk/azidentity"
    "github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resources/armsubscriptions"
)

certData, err := os.ReadFile("./example.pfx")
handle(err)

certs, key, err := azidentity.ParseCertificates(certData, nil)
handle(err)

cred, err = azidentity.NewClientCertificateCredential(tenantID, clientID, certs, key, nil)
handle(err)

client, err := armsubscriptions.NewClient(cred, nil)
handle(err)

Managed identity

autorest/adal

import (
    "github.com/Azure/azure-sdk-for-go/services/resources/mgmt/2018-06-01/subscriptions"
    "github.com/Azure/go-autorest/autorest"
    "github.com/Azure/go-autorest/autorest/adal"
)

spt, err := adal.NewServicePrincipalTokenFromManagedIdentity("https://management.azure.com/", nil)
handle(err)

client := subscriptions.NewClient()
client.Authorizer = autorest.NewBearerAuthorizer(spt)

azidentity

import (
    "github.com/Azure/azure-sdk-for-go/sdk/azidentity"
    "github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resources/armsubscriptions"
)

cred, err := azidentity.NewManagedIdentityCredential(nil)
handle(err)

client, err := armsubscriptions.NewClient(cred, nil)
handle(err)

User-assigned identities

autorest/adal:

import "github.com/Azure/go-autorest/autorest/adal"

opts := &adal.ManagedIdentityOptions{ClientID: "..."}
spt, err := adal.NewServicePrincipalTokenFromManagedIdentity("https://management.azure.com/")
handle(err)

azidentity:

import "github.com/Azure/azure-sdk-for-go/sdk/azidentity"

opts := azidentity.ManagedIdentityCredentialOptions{ID: azidentity.ClientID("...")}
cred, err := azidentity.NewManagedIdentityCredential(&opts)
handle(err)

Device code authentication

autorest/adal

import (
    "fmt"
    "net/http"

    "github.com/Azure/azure-sdk-for-go/services/resources/mgmt/2018-06-01/subscriptions"
    "github.com/Azure/go-autorest/autorest"
    "github.com/Azure/go-autorest/autorest/adal"
)

oauthClient := &http.Client{}
oauthCfg, err := adal.NewOAuthConfig("https://login.microsoftonline.com", tenantID)
handle(err)
resource := "https://management.azure.com/"
deviceCode, err := adal.InitiateDeviceAuth(oauthClient, *oauthCfg, clientID, resource)
handle(err)

// display instructions, wait for the user to authenticate
fmt.Println(*deviceCode.Message)
token, err := adal.WaitForUserCompletion(oauthClient, deviceCode)
handle(err)

spt, err := adal.NewServicePrincipalTokenFromManualToken(*oauthCfg, clientID, resource, *token)
handle(err)

client := subscriptions.NewClient()
client.Authorizer = autorest.NewBearerAuthorizer(spt)

azidentity

import (
    "github.com/Azure/azure-sdk-for-go/sdk/azidentity"
    "github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resources/armsubscriptions"
)

cred, err := azidentity.NewDeviceCodeCredential(nil)
handle(err)

client, err := armsubscriptions.NewSubscriptionsClient(cred, nil)
handle(err)

azidentity.DeviceCodeCredential will guide a user through authentication, printing instructions to the console by default. The user prompt is customizable. For more information, see the package documentation.

Acquire a token

autorest/adal

import "github.com/Azure/go-autorest/autorest/adal"

oauthCfg, err := adal.NewOAuthConfig("https://login.microsoftonline.com", tenantID)
handle(err)

spt, err := adal.NewServicePrincipalTokenWithSecret(
    *oauthCfg, clientID, "https://vault.azure.net", &adal.ServicePrincipalTokenSecret{ClientSecret: secret},
)

err = spt.Refresh()
if err == nil {
    token := spt.Token
}

azidentity

In ordinary usage, application code doesn't need to request tokens from credentials directly. Azure SDK clients handle token acquisition and refreshing internally. However, applications may call GetToken() to do so. All credential types have this method.

import (
    "github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
    "github.com/Azure/azure-sdk-for-go/sdk/azidentity"
)

cred, err := azidentity.NewClientSecretCredential(tenantID, clientID, secret, nil)
handle(err)

tk, err := cred.GetToken(
    context.TODO(), policy.TokenRequestOptions{Scopes: []string{"https://vault.azure.net/.default"}},
)
if err == nil {
    token := tk.Token
}

Note that azidentity credentials use the Microsoft Entra endpoint, which requires OAuth 2 scopes instead of the resource identifiers autorest/adal expects. For more information, see Microsoft Entra ID documentation.

Use azidentity credentials with older packages

The azidext module provides an adapter for azidentity credential types. The adapter enables using the credential types with older Azure SDK clients. For example:

import (
    "github.com/Azure/azure-sdk-for-go/sdk/azidentity"
    "github.com/Azure/azure-sdk-for-go/services/resources/mgmt/2018-06-01/subscriptions"
    "github.com/jongio/azidext/go/azidext"
)

cred, err := azidentity.NewClientSecretCredential(tenantID, clientID, secret, nil)
handle(err)

client := subscriptions.NewClient()
client.Authorizer = azidext.NewTokenCredentialAdapter(cred, []string{"https://management.azure.com//.default"})