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import { decode, encode } from 'base64-arraybuffer';
import { hexDump, getMessageType } from './misc';
import { sspi, AcceptSecurityContextInput } from '../../lib/api';
import { SSO } from './SSO';
import { ServerContextHandleManager } from './ServerContextHandleManager';
import dbg from 'debug';
import { AuthOptions, Middleware, NextFunction } from './interfaces';
import { IncomingMessage, ServerResponse } from 'http';
const debug = dbg('node-expose-sspi:auth');
/**
* Tries to get SSO information from browser. If success, the SSO info
* is stored under req.sso
*
* @export
* @param {AuthOptions} [options={}]
* @returns {RequestHandler}
*/
export function auth(Ioptions: AuthOptions = {}): Middleware {
const opts: AuthOptions = {
useActiveDirectory: true,
useGroups: true,
useOwner: false,
useCookies: true,
groupFilterRegex: '.*',
allowsGuest: false,
allowsAnonymousLogon: false,
};
Object.assign(opts, options);
let { credential, tsExpiry } = sspi.AcquireCredentialsHandle({
packageName: 'Negotiate',
});
const checkCredentials = (): void => {
Iif (tsExpiry < new Date()) {
// renew server credentials
sspi.FreeCredentialsHandle(credential);
const renewed = sspi.AcquireCredentialsHandle({
packageName: 'Negotiate',
});
credential = renewed.credential;
tsExpiry = renewed.tsExpiry;
}
};
const schManager = new ServerContextHandleManager(10000);
// returns the node middleware.
return (
req: IncomingMessage,
res: ServerResponse,
next: NextFunction
): void => {
(async (): Promise<void> => {
try {
const authorization = req.headers.authorization;
if (!authorization) {
debug('no authorization key in header');
res.statusCode = 401;
res.setHeader('WWW-Authenticate', 'Negotiate');
return res.end();
}
Iif (!authorization.startsWith('Negotiate ')) {
res.statusCode = 400;
return res.end(`Malformed authentication token: ${authorization}`);
}
checkCredentials();
const cookieToken = opts.useCookies
? schManager.initCookie(req, res)
: undefined;
debug('cookieToken: ', cookieToken);
const token = authorization.substring('Negotiate '.length);
const messageType = getMessageType(token);
debug('messageType: ', messageType);
const buffer = decode(token);
debug(hexDump(buffer));
// test if first token
if (
messageType === 'NTLM_NEGOTIATE_01' ||
messageType === 'Kerberos_1'
) {
await schManager.waitForReleased(cookieToken);
debug('schManager waitForReleased finished.');
const ssoMethod = messageType.startsWith('NTLM') ? 'NTLM' : 'Kerberos';
schManager.setMethod(ssoMethod, cookieToken);
}
const input: AcceptSecurityContextInput = {
credential,
clientSecurityContext: {
SecBufferDesc: {
ulVersion: 0,
buffers: [buffer],
},
},
};
const serverContextHandle = schManager.getServerContextHandle(
cookieToken
);
if (serverContextHandle) {
debug('adding to input a serverContextHandle (not first exchange)');
input.contextHandle = serverContextHandle;
}
debug('input just before calling AcceptSecurityContext', input);
const serverSecurityContext = sspi.AcceptSecurityContext(input);
debug(
'serverSecurityContext just after AcceptSecurityContext',
serverSecurityContext
);
Iif (
!['SEC_E_OK', 'SEC_I_CONTINUE_NEEDED'].includes(
serverSecurityContext.SECURITY_STATUS
)
) {
// 'SEC_I_COMPLETE_AND_CONTINUE', 'SEC_I_COMPLETE_NEEDED' are considered as errors because it is used
// only by 'Digest' SSP. (not by Negotiate, Kerberos or NTLM)
throw new Error(
'AcceptSecurityContext error: ' +
serverSecurityContext.SECURITY_STATUS
);
}
schManager.set(serverSecurityContext.contextHandle, cookieToken);
debug('AcceptSecurityContext output buffer');
debug(hexDump(serverSecurityContext.SecBufferDesc.buffers[0]));
if (serverSecurityContext.SECURITY_STATUS === 'SEC_I_CONTINUE_NEEDED') {
res.statusCode = 401;
res.setHeader(
'WWW-Authenticate',
'Negotiate ' +
encode(serverSecurityContext.SecBufferDesc.buffers[0])
);
return res.end();
}
const lastServerContextHandle = schManager.getServerContextHandle(
cookieToken
);
const method = schManager.getMethod(cookieToken);
const sso = new SSO(lastServerContextHandle, method);
sso.setOptions(opts);
await sso.load();
req.sso = sso.getJSON();
sspi.DeleteSecurityContext(lastServerContextHandle);
schManager.release(cookieToken);
// check if user is allowed.
Iif (
!opts.allowsAnonymousLogon &&
req.sso.user.name === 'ANONYMOUS LOGON'
) {
res.statusCode = 401;
return res.end('Anonymous login not authorized.');
}
Iif (!opts.allowsGuest && req.sso.user.name === 'Guest') {
res.statusCode = 401;
return res.end('Guest not authorized.');
}
// user authenticated and allowed.
res.setHeader(
'WWW-Authenticate',
'Negotiate ' + encode(serverSecurityContext.SecBufferDesc.buffers[0])
);
return next();
} catch (e) {
schManager.release();
console.error(e);
next(createError(400, `Error while doing SSO: ${e.message}`));
}
})();
};
}
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