/
adal.go
359 lines (312 loc) · 9.28 KB
/
adal.go
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package main
// Copyright 2017 Microsoft Corporation
//
// 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.
import (
"flag"
"fmt"
"log"
"strings"
"crypto/rsa"
"crypto/x509"
"io/ioutil"
"net/http"
"os/user"
"github.com/Azure/go-autorest/autorest/adal"
)
const (
deviceMode = "device"
clientSecretMode = "secret"
clientCertMode = "cert"
refreshMode = "refresh"
msiDefaultMode = "msiDefault"
msiClientIDMode = "msiClientID"
msiResourceIDMode = "msiResourceID"
activeDirectoryEndpoint = "https://login.microsoftonline.com/"
)
type option struct {
name string
value string
}
var (
mode string
resource string
tenantID string
applicationID string
identityResourceID string
applicationSecret string
certificatePath string
tokenCachePath string
)
func checkMandatoryOptions(mode string, options ...option) {
for _, option := range options {
if strings.TrimSpace(option.value) == "" {
log.Fatalf("Authentication mode '%s' requires mandatory option '%s'.", mode, option.name)
}
}
}
func defaultTokenCachePath() string {
usr, err := user.Current()
if err != nil {
log.Fatal(err)
}
defaultTokenPath := usr.HomeDir + "/.adal/accessToken.json"
return defaultTokenPath
}
func init() {
flag.StringVar(&mode, "mode", "device", "authentication mode (device, secret, cert, refresh)")
flag.StringVar(&resource, "resource", "", "resource for which the token is requested")
flag.StringVar(&tenantID, "tenantId", "", "tenant id")
flag.StringVar(&applicationID, "applicationId", "", "application id")
flag.StringVar(&applicationSecret, "secret", "", "application secret")
flag.StringVar(&certificatePath, "certificatePath", "", "path to pk12/PFC application certificate")
flag.StringVar(&tokenCachePath, "tokenCachePath", defaultTokenCachePath(), "location of oath token cache")
flag.StringVar(&identityResourceID, "identityResourceID", "", "managedIdentity azure resource id")
flag.Parse()
switch mode = strings.TrimSpace(mode); mode {
case msiDefaultMode:
checkMandatoryOptions(msiDefaultMode,
option{name: "resource", value: resource},
option{name: "tenantId", value: tenantID},
)
case msiClientIDMode:
checkMandatoryOptions(msiClientIDMode,
option{name: "resource", value: resource},
option{name: "tenantId", value: tenantID},
option{name: "applicationId", value: applicationID},
)
case msiResourceIDMode:
checkMandatoryOptions(msiResourceIDMode,
option{name: "resource", value: resource},
option{name: "tenantId", value: tenantID},
option{name: "identityResourceID", value: identityResourceID},
)
case clientSecretMode:
checkMandatoryOptions(clientSecretMode,
option{name: "resource", value: resource},
option{name: "tenantId", value: tenantID},
option{name: "applicationId", value: applicationID},
option{name: "secret", value: applicationSecret},
)
case clientCertMode:
checkMandatoryOptions(clientCertMode,
option{name: "resource", value: resource},
option{name: "tenantId", value: tenantID},
option{name: "applicationId", value: applicationID},
option{name: "certificatePath", value: certificatePath},
)
case deviceMode:
checkMandatoryOptions(deviceMode,
option{name: "resource", value: resource},
option{name: "tenantId", value: tenantID},
option{name: "applicationId", value: applicationID},
)
case refreshMode:
checkMandatoryOptions(refreshMode,
option{name: "resource", value: resource},
option{name: "tenantId", value: tenantID},
option{name: "applicationId", value: applicationID},
)
default:
log.Fatalln("Authentication modes 'secret, 'cert', 'device' or 'refresh' are supported.")
}
}
func acquireTokenClientSecretFlow(oauthConfig adal.OAuthConfig,
appliationID string,
applicationSecret string,
resource string,
callbacks ...adal.TokenRefreshCallback) (*adal.ServicePrincipalToken, error) {
spt, err := adal.NewServicePrincipalToken(
oauthConfig,
appliationID,
applicationSecret,
resource,
callbacks...)
if err != nil {
return nil, err
}
return spt, spt.Refresh()
}
func decodePkcs12(pkcs []byte, password string) (*x509.Certificate, *rsa.PrivateKey, error) {
return adal.DecodePfxCertificateData(pkcs, password)
}
func acquireTokenMSIFlow(applicationID string,
identityResourceID string,
resource string,
callbacks ...adal.TokenRefreshCallback) (*adal.ServicePrincipalToken, error) {
// only one of them can be present:
if applicationID != "" && identityResourceID != "" {
return nil, fmt.Errorf("didn't expect applicationID and identityResourceID at same time")
}
msiEndpoint, _ := adal.GetMSIVMEndpoint()
var spt *adal.ServicePrincipalToken
var err error
// both can be empty, systemAssignedMSI scenario
if applicationID == "" && identityResourceID == "" {
spt, err = adal.NewServicePrincipalTokenFromMSI(msiEndpoint, resource, callbacks...)
}
// msi login with clientID
if applicationID != "" {
spt, err = adal.NewServicePrincipalTokenFromMSIWithUserAssignedID(msiEndpoint, resource, applicationID, callbacks...)
}
// msi login with resourceID
if identityResourceID != "" {
spt, err = adal.NewServicePrincipalTokenFromMSIWithIdentityResourceID(msiEndpoint, resource, identityResourceID, callbacks...)
}
if err != nil {
return nil, err
}
return spt, spt.Refresh()
}
func acquireTokenClientCertFlow(oauthConfig adal.OAuthConfig,
applicationID string,
applicationCertPath string,
resource string,
callbacks ...adal.TokenRefreshCallback) (*adal.ServicePrincipalToken, error) {
certData, err := ioutil.ReadFile(certificatePath)
if err != nil {
return nil, fmt.Errorf("failed to read the certificate file (%s): %v", certificatePath, err)
}
certificate, rsaPrivateKey, err := decodePkcs12(certData, "")
if err != nil {
return nil, fmt.Errorf("failed to decode pkcs12 certificate while creating spt: %v", err)
}
spt, err := adal.NewServicePrincipalTokenFromCertificate(
oauthConfig,
applicationID,
certificate,
rsaPrivateKey,
resource,
callbacks...)
if err != nil {
return nil, err
}
return spt, spt.Refresh()
}
func acquireTokenDeviceCodeFlow(oauthConfig adal.OAuthConfig,
applicationID string,
resource string,
callbacks ...adal.TokenRefreshCallback) (*adal.ServicePrincipalToken, error) {
oauthClient := &http.Client{}
deviceCode, err := adal.InitiateDeviceAuth(
oauthClient,
oauthConfig,
applicationID,
resource)
if err != nil {
return nil, fmt.Errorf("Failed to start device auth flow: %s", err)
}
fmt.Println(*deviceCode.Message)
token, err := adal.WaitForUserCompletion(oauthClient, deviceCode)
if err != nil {
return nil, fmt.Errorf("Failed to finish device auth flow: %s", err)
}
spt, err := adal.NewServicePrincipalTokenFromManualToken(
oauthConfig,
applicationID,
resource,
*token,
callbacks...)
return spt, err
}
func refreshToken(oauthConfig adal.OAuthConfig,
applicationID string,
resource string,
tokenCachePath string,
callbacks ...adal.TokenRefreshCallback) (*adal.ServicePrincipalToken, error) {
token, err := adal.LoadToken(tokenCachePath)
if err != nil {
return nil, fmt.Errorf("failed to load token from cache: %v", err)
}
spt, err := adal.NewServicePrincipalTokenFromManualToken(
oauthConfig,
applicationID,
resource,
*token,
callbacks...)
if err != nil {
return nil, err
}
return spt, spt.Refresh()
}
func saveToken(spt adal.Token) error {
if tokenCachePath != "" {
err := adal.SaveToken(tokenCachePath, 0600, spt)
if err != nil {
return err
}
log.Printf("Acquired token was saved in '%s' file\n", tokenCachePath)
return nil
}
return fmt.Errorf("empty path for token cache")
}
func main() {
oauthConfig, err := adal.NewOAuthConfig(activeDirectoryEndpoint, tenantID)
if err != nil {
panic(err)
}
callback := func(token adal.Token) error {
return saveToken(token)
}
log.Printf("Authenticating with mode '%s'\n", mode)
switch mode {
case clientSecretMode:
_, err = acquireTokenClientSecretFlow(
*oauthConfig,
applicationID,
applicationSecret,
resource,
callback)
case clientCertMode:
_, err = acquireTokenClientCertFlow(
*oauthConfig,
applicationID,
certificatePath,
resource,
callback)
case deviceMode:
var spt *adal.ServicePrincipalToken
spt, err = acquireTokenDeviceCodeFlow(
*oauthConfig,
applicationID,
resource,
callback)
if err == nil {
err = saveToken(spt.Token())
}
case msiResourceIDMode:
fallthrough
case msiClientIDMode:
fallthrough
case msiDefaultMode:
var spt *adal.ServicePrincipalToken
spt, err = acquireTokenMSIFlow(
applicationID,
identityResourceID,
resource,
callback)
if err == nil {
err = saveToken(spt.Token())
}
case refreshMode:
_, err = refreshToken(
*oauthConfig,
applicationID,
resource,
tokenCachePath,
callback)
}
if err != nil {
log.Fatalf("Failed to acquire a token for resource %s. Error: %v", resource, err)
}
}