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import type * as Msal from '@azure/msal-node';
import type * as NodeForge from 'node-forge';
import { FileTokenStorage } from './auth/FileTokenStorage';
import { msalCachePlugin } from './auth/msalCachePlugin';
import { TokenStorage } from './auth/TokenStorage';
import type { AuthServer } from './AuthServer';
import { Logger } from './cli';
import { CommandError } from './Command';
import config from './config';
import request from './request';
export interface Hash<TValue> {
[key: string]: TValue;
}
interface AccessToken {
expiresOn: Date | string | null;
accessToken: string;
}
export interface InteractiveAuthorizationCodeResponse {
code: string;
redirectUri: string;
}
export interface InteractiveAuthorizationErrorResponse {
error: string;
errorDescription: string;
}
export class Service {
connected: boolean = false;
authType: AuthType = AuthType.DeviceCode;
userName?: string;
password?: string;
certificateType: CertificateType = CertificateType.Unknown;
certificate?: string;
thumbprint?: string;
accessTokens: Hash<AccessToken>;
spoUrl?: string;
tenantId?: string;
// ID of the Azure AD app used to authenticate
appId: string;
// ID of the tenant where the Azure AD app is registered; common if multitenant
tenant: string;
constructor() {
this.accessTokens = {};
this.appId = config.cliAadAppId;
this.tenant = config.tenant;
}
public logout(): void {
this.connected = false;
this.accessTokens = {};
this.authType = AuthType.DeviceCode;
this.userName = undefined;
this.password = undefined;
this.certificateType = CertificateType.Unknown;
this.certificate = undefined;
this.thumbprint = undefined;
this.spoUrl = undefined;
this.tenantId = undefined;
this.appId = config.cliAadAppId;
this.tenant = config.tenant;
}
}
export enum AuthType {
DeviceCode,
Password,
Certificate,
Identity,
Browser
}
export enum CertificateType {
Unknown,
Base64,
Binary
}
export class Auth {
private _authServer: AuthServer | undefined;
private deviceCodeRequest?: Msal.DeviceCodeRequest;
private _service: Service;
private clientApplication: Msal.ClientApplication | undefined;
public get service(): Service {
return this._service;
}
public get defaultResource(): string {
return 'https://graph.microsoft.com';
}
constructor() {
this._service = new Service();
}
public async restoreAuth(): Promise<void> {
// check if auth has been restored previously
if (this._service.connected) {
return Promise.resolve();
}
try {
const service: Service = await this.getServiceConnectionInfo<Service>();
this._service = Object.assign(this._service, service);
}
catch {
}
}
public async ensureAccessToken(resource: string, logger: Logger, debug: boolean = false, fetchNew: boolean = false): Promise<string> {
const now: Date = new Date();
const accessToken: AccessToken | undefined = this.service.accessTokens[resource];
const expiresOn: Date = accessToken && accessToken.expiresOn ?
// if expiresOn is serialized from the service file, it's set as a string
// if it's coming from MSAL, it's a Date
typeof accessToken.expiresOn === 'string' ? new Date(accessToken.expiresOn) : accessToken.expiresOn
: new Date(0);
if (!fetchNew && accessToken && expiresOn > now) {
if (debug) {
logger.logToStderr(`Existing access token ${accessToken.accessToken} still valid. Returning...`);
}
return accessToken.accessToken;
}
else {
if (debug) {
if (!accessToken) {
logger.logToStderr(`No token found for resource ${resource}`);
}
else {
logger.logToStderr(`Access token expired. Token: ${accessToken.accessToken}, ExpiresAt: ${accessToken.expiresOn}`);
}
}
}
let getTokenPromise: ((resource: string, logger: Logger, debug: boolean, fetchNew: boolean) => Promise<AccessToken | null>) | undefined;
// when using cert, you can't retrieve token silently, because there is
// no account. Also cert auth instantiates clientApplication itself
// after inspecting the specified cert and calculating thumbprint if one
// wasn't specified
if (this.service.authType !== AuthType.Certificate) {
this.clientApplication = this.getClientApplication(logger, debug);
if (this.clientApplication) {
const accounts = await this.clientApplication.getTokenCache().getAllAccounts();
if (accounts.length > 0) {
getTokenPromise = this.ensureAccessTokenSilent.bind(this);
}
}
}
if (!getTokenPromise) {
switch (this.service.authType) {
case AuthType.DeviceCode:
getTokenPromise = this.ensureAccessTokenWithDeviceCode.bind(this);
break;
case AuthType.Password:
getTokenPromise = this.ensureAccessTokenWithPassword.bind(this);
break;
case AuthType.Certificate:
getTokenPromise = this.ensureAccessTokenWithCertificate.bind(this);
break;
case AuthType.Identity:
getTokenPromise = this.ensureAccessTokenWithIdentity.bind(this);
break;
case AuthType.Browser:
getTokenPromise = this.ensureAccessTokenWithBrowser.bind(this);
break;
}
}
const response = await getTokenPromise(resource, logger, debug, fetchNew);
if (!response) {
if (debug) {
logger.logToStderr(`getTokenPromise authentication result is null`);
}
throw `Failed to retrieve an access token. Please try again`;
}
else {
if (debug) {
logger.logToStderr('Response');
logger.logToStderr(response);
logger.logToStderr('');
}
}
this.service.accessTokens[resource] = {
expiresOn: response.expiresOn,
accessToken: response.accessToken
};
this.service.connected = true;
try {
await this.storeConnectionInfo();
}
catch (ex) {
// error could happen due to an issue with persisting the access
// token which shouldn't fail the overall token retrieval process
if (debug) {
logger.logToStderr(new CommandError(ex));
}
}
return response.accessToken;
}
private getClientApplication(logger: Logger, debug: boolean): Msal.ClientApplication | undefined {
switch (this.service.authType) {
case AuthType.DeviceCode:
case AuthType.Password:
case AuthType.Browser:
return this.getPublicClient(logger, debug);
case AuthType.Certificate:
return this.getConfidentialClient(logger, debug, this.service.thumbprint as string, this.service.password);
case AuthType.Identity:
// msal-node doesn't support managed identity so we need to do it manually
return undefined;
}
}
private getAuthClientConfiguration(logger: Logger, debug: boolean, certificateThumbprint?: string, certificatePrivateKey?: string): Msal.Configuration {
const msal: typeof Msal = require('@azure/msal-node');
const { LogLevel } = msal;
const cert = !certificateThumbprint ? undefined : {
thumbprint: certificateThumbprint,
privateKey: certificatePrivateKey as string
};
return {
auth: {
clientId: this.service.appId,
authority: `https://login.microsoftonline.com/${this.service.tenant}`,
clientCertificate: cert
},
cache: {
cachePlugin: msalCachePlugin
},
system: {
loggerOptions: {
// loggerCallback is called by MSAL which we're not testing
/* c8 ignore next 4 */
loggerCallback: (level: Msal.LogLevel, message: string) => {
if (level === LogLevel.Error || debug) {
logger.logToStderr(message);
}
},
piiLoggingEnabled: false,
logLevel: debug ? LogLevel.Verbose : LogLevel.Error
}
}
};
}
private getPublicClient(logger: Logger, debug: boolean) {
const msal: typeof Msal = require('@azure/msal-node');
const { PublicClientApplication } = msal;
if (this.service.authType === AuthType.Password &&
this.service.tenant === 'common') {
// common is not supported for the password flow and must be changed to
// organizations
this.service.tenant = 'organizations';
}
return new PublicClientApplication(this.getAuthClientConfiguration(logger, debug));
}
private getConfidentialClient(logger: Logger, debug: boolean, certificateThumbprint: string, certificatePrivateKey?: string) {
const msal: typeof Msal = require('@azure/msal-node');
const { ConfidentialClientApplication } = msal;
return new ConfidentialClientApplication(this.getAuthClientConfiguration(logger, debug, certificateThumbprint, certificatePrivateKey));
}
private retrieveAuthCodeWithBrowser(resource: string, logger: Logger, debug: boolean): Promise<InteractiveAuthorizationCodeResponse> {
return new Promise<InteractiveAuthorizationCodeResponse>((resolve: (error: InteractiveAuthorizationCodeResponse) => void, reject: (error: InteractiveAuthorizationErrorResponse) => void): void => {
// _authServer is never set before hitting this line, but this check
// is implemented so that we can support lazy loading
// but also stub it for testing
/* c8 ignore next 3 */
if (!this._authServer) {
this._authServer = require('./AuthServer').default;
}
(this._authServer as AuthServer).initializeServer(this.service, resource, resolve, reject, logger, debug);
});
}
private async ensureAccessTokenWithBrowser(resource: string, logger: Logger, debug: boolean): Promise<AccessToken | null> {
if (debug) {
logger.logToStderr(`Retrieving new access token using interactive browser session...`);
}
const response = await this.retrieveAuthCodeWithBrowser(resource, logger, debug);
if (debug) {
logger.logToStderr(`The service returned the code '${response.code}'`);
}
return (this.clientApplication as Msal.PublicClientApplication).acquireTokenByCode({
code: response.code,
redirectUri: response.redirectUri,
scopes: [`${resource}/.default`]
});
}
private async ensureAccessTokenSilent(resource: string, logger: Logger, debug: boolean, fetchNew: boolean): Promise<AccessToken | null> {
if (debug) {
logger.logToStderr(`Retrieving new access token silently`);
}
const accounts = await (this.clientApplication as Msal.ClientApplication)
.getTokenCache().getAllAccounts();
return (this.clientApplication as Msal.ClientApplication).acquireTokenSilent({
account: accounts[0],
scopes: [`${resource}/.default`],
forceRefresh: fetchNew
});
}
private async ensureAccessTokenWithDeviceCode(resource: string, logger: Logger, debug: boolean): Promise<AccessToken | null> {
if (debug) {
logger.logToStderr(`Starting Auth.ensureAccessTokenWithDeviceCode. resource: ${resource}, debug: ${debug}`);
}
this.deviceCodeRequest = {
// deviceCodeCallback is called by MSAL which we're not testing
/* c8 ignore next 9 */
deviceCodeCallback: response => {
if (debug) {
logger.logToStderr('Response:');
logger.logToStderr(response);
logger.logToStderr('');
}
logger.log(response.message);
},
scopes: [`${resource}/.default`]
};
return (this.clientApplication as Msal.PublicClientApplication).acquireTokenByDeviceCode(this.deviceCodeRequest) as Promise<AccessToken | null>;
}
private async ensureAccessTokenWithPassword(resource: string, logger: Logger, debug: boolean): Promise<AccessToken | null> {
if (debug) {
logger.logToStderr(`Retrieving new access token using credentials...`);
}
return (this.clientApplication as Msal.PublicClientApplication).acquireTokenByUsernamePassword({
username: this.service.userName as string,
password: encodeURIComponent(this.service.password as string),
scopes: [`${resource}/.default`]
});
}
private async ensureAccessTokenWithCertificate(resource: string, logger: Logger, debug: boolean): Promise<AccessToken | null> {
const nodeForge: typeof NodeForge = require('node-forge');
const { pem, pki, asn1, pkcs12 } = nodeForge;
if (debug) {
logger.logToStderr(`Retrieving new access token using certificate...`);
}
let cert: string = '';
const buf = Buffer.from(this.service.certificate as string, 'base64');
if (this.service.certificateType === CertificateType.Unknown || this.service.certificateType === CertificateType.Base64) {
// First time this method is called, we don't know if certificate is PEM or PFX (type is Unknown)
// We assume it is PEM but when parsing of PEM fails, we assume it could be PFX
// Type is persisted on service so subsequent calls only run through the correct parsing flow
try {
cert = buf.toString('utf8');
const pemObjs: NodeForge.pem.ObjectPEM[] = pem.decode(cert);
if (this.service.thumbprint === undefined) {
const pemCertObj: NodeForge.pem.ObjectPEM = pemObjs.find(pem => pem.type === "CERTIFICATE") as NodeForge.pem.ObjectPEM;
const pemCertStr: string = pem.encode(pemCertObj);
const pemCert: NodeForge.pki.Certificate = pki.certificateFromPem(pemCertStr);
this.service.thumbprint = this.calculateThumbprint(pemCert);
}
}
catch (e) {
this.service.certificateType = CertificateType.Binary;
}
}
if (this.service.certificateType === CertificateType.Binary) {
const p12Asn1 = asn1.fromDer(buf.toString('binary'), false);
const p12Parsed = pkcs12.pkcs12FromAsn1(p12Asn1, false, this.service.password);
let keyBags: any = p12Parsed.getBags({ bagType: pki.oids.pkcs8ShroudedKeyBag });
const pkcs8ShroudedKeyBag = keyBags[pki.oids.pkcs8ShroudedKeyBag][0];
if (debug) {
// check if there is something in the keyBag as well as
// the pkcs8ShroudedKeyBag. This will give us more information
// whether there is a cert that can potentially store keys in the keyBag.
// I could not find a way to add something to the keyBag with all
// my attempts, but lets keep it here for troubleshooting purposes.
logger.logToStderr(`pkcs8ShroudedKeyBagkeyBags length is ${[pki.oids.pkcs8ShroudedKeyBag].length}`);
keyBags = p12Parsed.getBags({ bagType: pki.oids.keyBag });
logger.logToStderr(`keyBag length is ${keyBags[pki.oids.keyBag].length}`);
}
// convert a Forge private key to an ASN.1 RSAPrivateKey
const rsaPrivateKey = pki.privateKeyToAsn1(pkcs8ShroudedKeyBag.key);
// wrap an RSAPrivateKey ASN.1 object in a PKCS#8 ASN.1 PrivateKeyInfo
const privateKeyInfo = pki.wrapRsaPrivateKey(rsaPrivateKey);
// convert a PKCS#8 ASN.1 PrivateKeyInfo to PEM
cert = pki.privateKeyInfoToPem(privateKeyInfo);
if (this.service.thumbprint === undefined) {
const certBags: {
[key: string]: NodeForge.pkcs12.Bag[] | undefined;
localKeyId?: NodeForge.pkcs12.Bag[];
friendlyName?: NodeForge.pkcs12.Bag[];
} = p12Parsed.getBags({ bagType: pki.oids.certBag });
const certBag: NodeForge.pkcs12.Bag = (certBags[pki.oids.certBag] as NodeForge.pkcs12.Bag[])[0];
this.service.thumbprint = this.calculateThumbprint(certBag.cert as NodeForge.pki.Certificate);
}
}
this.clientApplication = this.getConfidentialClient(logger, debug, this.service.thumbprint as string, cert);
return (this.clientApplication as Msal.ConfidentialClientApplication).acquireTokenByClientCredential({
scopes: [`${resource}/.default`]
});
}
private async ensureAccessTokenWithIdentity(resource: string, logger: Logger, debug: boolean): Promise<AccessToken | null> {
const userName = this.service.userName;
if (debug) {
logger.logToStderr('Will try to retrieve access token using identity...');
}
const requestOptions: any = {
url: '',
headers: {
accept: 'application/json',
Metadata: true,
'x-anonymous': true
},
responseType: 'json'
};
if (process.env.IDENTITY_ENDPOINT && process.env.IDENTITY_HEADER) {
if (debug) {
logger.logToStderr('IDENTITY_ENDPOINT and IDENTITY_HEADER env variables found it is Azure Function, WebApp...');
}
requestOptions.url = `${process.env.IDENTITY_ENDPOINT}?resource=${encodeURIComponent(resource)}&api-version=2019-08-01`;
requestOptions.headers['X-IDENTITY-HEADER'] = process.env.IDENTITY_HEADER;
}
else if (process.env.MSI_ENDPOINT && process.env.MSI_SECRET) {
if (debug) {
logger.logToStderr('MSI_ENDPOINT and MSI_SECRET env variables found it is Azure Function or WebApp, but using the old names of the env variables...');
}
requestOptions.url = `${process.env.MSI_ENDPOINT}?resource=${encodeURIComponent(resource)}&api-version=2019-08-01`;
requestOptions.headers['X-IDENTITY-HEADER'] = process.env.MSI_SECRET;
}
else if (process.env.IDENTITY_ENDPOINT) {
if (debug) {
logger.logToStderr('IDENTITY_ENDPOINT env variable found it is Azure Could Shell...');
}
if (userName && process.env.ACC_CLOUD) {
// reject for now since the Azure Cloud Shell does not support user-managed identity
return Promise.reject('Azure Cloud Shell does not support user-managed identity. You can execute the command without the --userName option to login with user identity');
}
requestOptions.url = `${process.env.IDENTITY_ENDPOINT}?resource=${encodeURIComponent(resource)}`;
}
else if (process.env.MSI_ENDPOINT) {
if (debug) {
logger.logToStderr('MSI_ENDPOINT env variable found it is Azure Could Shell, but using the old names of the env variables...');
}
if (userName && process.env.ACC_CLOUD) {
// reject for now since the Azure Cloud Shell does not support user-managed identity
return Promise.reject('Azure Cloud Shell does not support user-managed identity. You can execute the command without the --userName option to login with user identity');
}
requestOptions.url = `${process.env.MSI_ENDPOINT}?resource=${encodeURIComponent(resource)}`;
}
else {
if (debug) {
logger.logToStderr('IDENTITY_ENDPOINT and MSI_ENDPOINT env variables not found. Attempt to get Managed Identity token by using the Azure Virtual Machine API...');
}
requestOptions.url = `http://169.254.169.254/metadata/identity/oauth2/token?resource=${encodeURIComponent(resource)}&api-version=2018-02-01`;
}
if (userName) {
// if name present then the identity is user-assigned managed identity
// the name option in this case is either client_id or principal_id (object_id)
// of the managed identity service principal
requestOptions.url += `&client_id=${encodeURIComponent(userName as string)}`;
if (debug) {
logger.logToStderr('Wil try to get token using client_id param...');
}
}
try {
const accessTokenResponse = await request.get<{ access_token: string; expires_on: string }>(requestOptions);
return {
accessToken: accessTokenResponse.access_token,
expiresOn: new Date(parseInt(accessTokenResponse.expires_on) * 1000)
};
}
catch (e) {
if (!userName) {
throw e;
}
// since the userName option can be either client_id or principal_id (object_id)
// and the first attempt was using client_id
// now lets see if the api returned 'not found' response and
// try to get token using principal_id (object_id)
let isNotFoundResponse = false;
if (e.error && e.error.Message) {
// check if it is Azure Function api 'not found' response
isNotFoundResponse = (e.error.Message.indexOf("No Managed Identity found") !== -1);
}
else if (e.error && e.error.error_description) {
// check if it is Azure VM api 'not found' response
isNotFoundResponse = (e.error.error_description === "Identity not found");
}
if (!isNotFoundResponse) {
// it is not a 'not found' response then exit with error
throw e;
}
if (debug) {
logger.logToStderr('Wil try to get token using principal_id (also known as object_id) param ...');
}
requestOptions.url = requestOptions.url.replace('&client_id=', '&principal_id=');
requestOptions.headers['x-anonymous'] = true;
try {
const accessTokenResponse = await request.get<{ access_token: string; expires_on: string }>(requestOptions);
return {
accessToken: accessTokenResponse.access_token,
expiresOn: new Date(parseInt(accessTokenResponse.expires_on) * 1000)
};
}
catch (err) {
// will give up and not try any further with the 'msi_res_id' (resource id) query string param
// since it does not work with the Azure Functions api, but just with the Azure VM api
if (err.error.code === 'EACCES') {
// the CLI does not know if managed identity is actually assigned when EACCES code thrown
// so show meaningful message since the raw error response could be misleading
return Promise.reject('Error while logging with Managed Identity. Please check if a Managed Identity is assigned to the current Azure resource.');
}
else {
throw err;
}
}
}
}
private calculateThumbprint(certificate: NodeForge.pki.Certificate): string {
const nodeForge: typeof NodeForge = require('node-forge');
const { md, asn1, pki } = nodeForge;
const messageDigest: NodeForge.md.MessageDigest = md.sha1.create();
messageDigest.update(asn1.toDer(pki.certificateToAsn1(certificate)).getBytes());
return messageDigest.digest().toHex();
}
public static getResourceFromUrl(url: string): string {
let resource: string = url;
const pos: number = resource.indexOf('/', 8);
if (pos > -1) {
resource = resource.substr(0, pos);
}
if (resource === 'https://api.bap.microsoft.com') {
// api.bap.microsoft.com is not a valid resource
// we need to use https://management.azure.com/ instead
resource = 'https://management.azure.com/';
}
return resource;
}
private async getServiceConnectionInfo<TConn>(): Promise<TConn> {
const tokenStorage = this.getTokenStorage();
const json: string = await tokenStorage.get();
return JSON.parse(json);
}
public storeConnectionInfo(): Promise<void> {
const tokenStorage = this.getTokenStorage();
return tokenStorage.set(JSON.stringify(this.service));
}
public async clearConnectionInfo(): Promise<void> {
const tokenStorage = this.getTokenStorage();
await tokenStorage.remove();
// we need to manually clear MSAL cache, because MSAL doesn't have support
// for logging out when using cert-based auth
const msalCache = this.getMsalCacheStorage();
await msalCache.remove();
}
public getTokenStorage(): TokenStorage {
return new FileTokenStorage(FileTokenStorage.connectionInfoFilePath());
}
private getMsalCacheStorage(): TokenStorage {
return new FileTokenStorage(FileTokenStorage.msalCacheFilePath());
}
public static isAppOnlyAuth(accessToken: string): boolean | undefined {
let isAppOnlyAuth: boolean | undefined;
if (!accessToken || accessToken.length === 0) {
return isAppOnlyAuth;
}
const chunks = accessToken.split('.');
if (chunks.length !== 3) {
return isAppOnlyAuth;
}
const tokenString: string = Buffer.from(chunks[1], 'base64').toString();
try {
const token: any = JSON.parse(tokenString);
isAppOnlyAuth = !token.upn;
}
catch {
}
return isAppOnlyAuth;
}
}
export default new Auth();
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