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authutils.go
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authutils.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"os/user"
"strings"
"github.com/Azure/go-autorest/autorest/adal"
)
const (
msiEndpoint = "http://localhost:50342/oauth2/token"
activeDirectoryEndpoint = "https://login.microsoftonline.com/"
armResource = "https://management.core.windows.net/"
clientAppID = "04b07795-8ddb-461a-bbee-02f9e1bf7b46"
commonTenant = "common"
)
type responseJSON struct {
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
Resource string `json:"resource"`
TokenType string `json:"token_type"`
}
type tenant struct {
ID string `json:"id"`
TenantID string `json:"tenantId"`
}
type tenantList struct {
Value []tenant `json:"value"`
}
func defaultTokenCachePath(tenant string) string {
usr, err := user.Current()
if err != nil {
log.Fatal(err)
}
defaultTokenPath := fmt.Sprintf("%s/.armclient/accessToken.%s.json", usr.HomeDir, strings.ToLower(tenant))
return defaultTokenPath
}
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, tenant string) error {
err := adal.SaveToken(defaultTokenCachePath(tenant), 0600, spt)
if err != nil {
return err
}
return nil
}
func getTenants(commonTenantToken string) (ret []string, e error) {
url, err := getRequestURL("/tenants?api-version=2015-01-01")
if err != nil {
return nil, err
}
client := &http.Client{}
req, _ := http.NewRequest(http.MethodGet, url, nil)
req.Header.Set("Authorization", commonTenantToken)
req.Header.Set("User-Agent", userAgentStr)
req.Header.Set("x-ms-client-request-id", newUUID())
req.Header.Set("Accept", "application/json")
response, err := client.Do(req)
if err != nil {
return nil, errors.New("Failed to list tenants: " + err.Error())
}
defer response.Body.Close()
buf, err := ioutil.ReadAll(response.Body)
var tenants tenantList
json.Unmarshal(buf, &tenants)
for _, t := range tenants.Value {
ret = append(ret, t.TenantID)
log.Printf("Tenant found: %s", t.TenantID)
}
return ret, nil
}
func acquireAuthTokenDeviceFlow(tenantID string) (string, error) {
oauthConfig, err := adal.NewOAuthConfig(activeDirectoryEndpoint, tenantID)
if err != nil {
panic(err)
}
callback := func(token adal.Token) error {
return saveToken(token, tenantID)
}
if _, err := os.Stat(defaultTokenCachePath(tenantID)); err == nil {
token, err := adal.LoadToken(defaultTokenCachePath(tenantID))
if err != nil {
return "", err
}
var spt *adal.ServicePrincipalToken
if token.IsExpired() {
spt, err = refreshToken(*oauthConfig, clientAppID, armResource, defaultTokenCachePath(tenantID), callback)
if err == nil {
return fmt.Sprintf("%s %s", spt.Type, spt.AccessToken), nil
}
} else {
return fmt.Sprintf("%s %s", token.Type, token.AccessToken), nil
}
}
if tenantID != commonTenant {
_, err := acquireAuthTokenDeviceFlow(commonTenant)
if err != nil {
return "", err
}
spt, err := refreshToken(*oauthConfig, clientAppID, armResource, defaultTokenCachePath(commonTenant), callback)
if err != nil {
return "", err
}
return fmt.Sprintf("%s %s", spt.Type, spt.AccessToken), nil
}
var spt *adal.ServicePrincipalToken
spt, err = acquireTokenDeviceCodeFlow(
*oauthConfig,
clientAppID,
armResource,
callback)
if err == nil {
err = saveToken(spt.Token, tenantID)
}
return fmt.Sprintf("%s %s", spt.Type, spt.AccessToken), nil
}
func acquireAuthTokenMSI() (string, error) {
msiendpoint, _ := url.Parse(msiEndpoint)
parameters := url.Values{}
parameters.Add("resource", armResource)
msiendpoint.RawQuery = parameters.Encode()
req, err := http.NewRequest("GET", msiendpoint.String(), nil)
if err != nil {
return "", err
}
req.Header.Add("Metadata", "true")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
return "", err
}
responseBytes, err := ioutil.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
return "", err
}
var r responseJSON
err = json.Unmarshal(responseBytes, &r)
if err != nil {
return "", err
}
return r.TokenType + " " + r.AccessToken, nil
}
func acquireAuthToken() (string, error) {
_, isCloudShell := os.LookupEnv("ACC_CLOUD")
if !isCloudShell {
token, err := acquireAuthTokenDeviceFlow(commonTenant)
if err != nil {
return "", err
}
tenants, err := getTenants(token)
if err != nil {
return "", errors.New("Failed to list tenants: " + err.Error())
}
var tokens []string
for _, t := range tenants {
token, err := acquireAuthTokenDeviceFlow(t)
if err != nil {
log.Println("Failed to login to tenant: ", t)
} else {
tokens = append(tokens, token)
}
}
return tokens[0], nil
}
token, err := acquireAuthTokenMSI()
if err != nil {
return "", err
}
return token, nil
}