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GeezerVison is showing github.com — javaxt-express/src/javaxt/express/Authenticator.java at master · javaxt-project/javaxt-express Expand file tree/ Copy pathAuthenticator.javaMore file actions 545 lines (451 loc) · 19.3 KB / Copy pathAuthenticator.javaFile metadata and controls545 lines (451 loc) · 19.3 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 package javaxt.express; import java.io.IOException; import java.util.concurrent.ConcurrentHashMap; import javaxt.http.servlet.HttpServletRequest; import javaxt.http.servlet.HttpServletResponse; import javaxt.http.servlet.ServletException; //****************************************************************************** //** Authenticator //****************************************************************************** /** * This class is an implementation of a javaxt.http.servlet.Authenticator * used to authenticate requests in a javaxt.http.servlet.HttpServlet. * Instances of this class are passed to the setAuthenticator() method in * the HttpServlet class. Once the HttpServlet has an Authenticator, it can * be used to retrieve credentials, get user principle, etc. Example: * <pre> public class WebApp extends HttpServlet { public WebApp(){ setAuthenticator(new javaxt.express.Authenticator()); } public void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String[] credentials = getCredentials(); //Calls Authenticator! String username = credentials[0]; String password = credentials[1]; } } </pre> * * The getCredentials() method provided by this class supports both "BASIC" * and "NTLM" authentication methods. * * The following snippit demonstrates how to perform "BASIC" authentication * with a username and password. This example assumes that there is a User * class that implements the java.security.Principal interface. The getUser() * and setUser() methods in this example are used to update an internal cache. * The cache is used to map a username to a User and is primarily used to * help reduce database queries. Entries in the cache are invalidated after * 30 seconds. * <pre> setAuthenticator(new javaxt.express.Authenticator(){ public java.security.Principal getPrinciple(){ User user = (User) getUser(); if (user!=null) return user; try{ String[] credentials = getCredentials(); String username = credentials[0]; String password = credentials[1]; if (username!=null && password!=null){ //TODO: Find user in the database } } catch(Exception e){ } setUser(user); return user; } }); </pre> * * With "NTLM" authentication, only the username is returned by the * getCredentials() method. The password will be null. This is because the * user has already been authenticated by another provider (e.g. AD). All * that's left to do is to map the username to a User/Principal via the * getPrinciple() method. * * Additional authentication methods can be added by overriding the * getCredentials() method. * * This class also includes a handleRequest() method that can be used to * simplify authentication workflows used in JavaXT web applications. * ******************************************************************************/ public class Authenticator implements javaxt.http.servlet.Authenticator, Cloneable { //Local variables private String authType; private String authInfo; private String[] credentials; private HttpServletRequest request; //set via reflection in newInstance //Global variables private static final ConcurrentHashMap<String, Object[]> cache = new ConcurrentHashMap<>(); private static final long cacheExpiration = 30000; //30 seconds //************************************************************************** //** newInstance //************************************************************************** /** Creates a new instance of this class. This method is called by the * HttpServletRequest class every time an HTTP request is made to the * server. */ public Authenticator newInstance(HttpServletRequest request){ try{ //Create new Authenticator Object obj = this.clone(); //Get Authenticator class Class c = this.getClass(); java.lang.reflect.Field field; try{ c.getDeclaredField("request"); } catch(NoSuchFieldException e){ c = c.getSuperclass(); } //Update private fields field = c.getDeclaredField("request"); field.setAccessible(true); field.set(obj, request); return (Authenticator) obj; } catch(Exception e){ e.printStackTrace(); throw new RuntimeException(); } } //************************************************************************** //** authenticate //************************************************************************** /** Used to authenticate an HTTP request. If the getPrinciple() method fails * to return a user, this method throws a ServletException. Override as * needed. */ public void authenticate() throws ServletException { java.security.Principal user = getPrinciple(); if (user==null) throw new ServletException(); } //************************************************************************** //** getPrinciple //************************************************************************** /** Returns the java.security.Principal associated with an HTTP request. * This method should be overridden as shown in the example above. * Otherwise, this method will return null and any calls to the * authenticate() method will throw a ServletException. */ public java.security.Principal getPrinciple(){ return null; } //************************************************************************** //** getCredentials //************************************************************************** /** Returns an array representing user credentials associated with an HTTP * request. In the case of "BASIC" authentication, the credentials contain * the username and password. In the case of "NTLM" authentication, the * credentials only contain a username. Override as needed. */ public String[] getCredentials() { if (credentials==null){ String authType = getAuthType(); if (authType==null) authType = ""; if (authType.equals("BASIC")){ //Decode the string String auth = new String( javaxt.utils.Base64.decode(authInfo) ); //Parse credentials String username = auth.substring(0, auth.indexOf(":")); String password = auth.substring(auth.indexOf(":")+1); credentials = new String[]{username, password}; } else if (authType.equals("NTLM")){ byte[] msg = javaxt.utils.Base64.decode(authInfo); int off = 0, length, offset; if (msg[8] == 3) { off = 30; length = msg[off+17]*256 + msg[off+16]; offset = msg[off+19]*256 + msg[off+8]; //String computerName = new String(msg, offset, length); //System.out.println("computerName: " + computerName); //Get domain name length = msg[off+1]*256 + msg[off]; offset = msg[off+3]*256 + msg[off+2]; String str = new String(msg, offset, length); StringBuilder domainName = new StringBuilder(); for (int i=0; i<str.length(); i++){ int c = str.charAt(i); if (c!=0) domainName.append((char) c); } if (domainName.length()==0) domainName = null; //Get username length = msg[off+9]*256 + msg[off+8]; offset = msg[off+11]*256 + msg[off+10]; str = new String(msg, offset, length); StringBuilder username = new StringBuilder(); for (int i=0; i<str.length(); i++){ int c = str.charAt(i); if (c!=0) username.append((char) c); } if (username.length()==0) username = null; if (domainName!=null && username!=null){ credentials = new String[]{username.toString(), null}; } } } } return credentials; } //************************************************************************** //** getAuthType //************************************************************************** /** Returns the authentication scheme used to authenticate clients (e.g. * "BASIC", "NTLM", etc). By default, this class parses the "Authorization" * HTTP request header to determine the authentication scheme. Override as * needed. */ public String getAuthType(){ if (authType==null){ String authorization = request.getHeader("Authorization"); if (authorization!=null){ int idx = authorization.indexOf(" "); authType = authorization.substring(0, idx).toUpperCase(); authInfo = authorization.substring(idx+1); } } return authType; } //************************************************************************** //** isUserInRole //************************************************************************** /** This method is a legacy feature from the Java Servlet API. Returns * false. Override as needed. */ public boolean isUserInRole(String role){ return false; } //************************************************************************** //** getUsername //************************************************************************** /** Returns the first entry in the array returned by getCredentials(). * Override as needed. */ protected String getUsername(){ String[] credentials = getCredentials(); return (credentials!=null) ? credentials[0] : null; } //************************************************************************** //** getUser //************************************************************************** /** Returns a User from the cache. The username returned from getUsername() * is used to find the User in the cache. Override as needed. */ protected User getUser(){ User user = null; String username = getUsername(); if (username!=null){ //Check if the credentials correspond to a logout request. See the //handleRequest() method for more information. //if (username.equals("logout") && password.equals("logout")) return; synchronized(cache){ Object[] arr = cache.get(username); if (arr!=null){ long lastUpdate = (long) arr[1]; if (System.currentTimeMillis()-lastUpdate<cacheExpiration){ user = (User) arr[0]; } else{ cache.remove(username); cache.notifyAll(); } } } } return user; } //************************************************************************** //** setUser //************************************************************************** /** Used to add a User to the cache. The username returned from getUsername() * is used as the key in the cache. Override as needed. */ protected void setUser(User user){ if (user!=null){ String username = getUsername(); if (username!=null){ synchronized(cache){ cache.put(username, new Object[]{user, System.currentTimeMillis()}); cache.notifyAll(); } } } } //************************************************************************** //** getRequest //************************************************************************** /** Returns the HttpServletRequest used to instantiate this instance of the * Authenticator. */ public HttpServletRequest getRequest(){ return request; } //************************************************************************** //** handleRequest //************************************************************************** /** Used to process an authentication workflow. Returns true if a response * was generated for the client. Example usage: <pre> public void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Authenticator authenticator = (Authenticator) getAuthenticator(request); if (authenticator.handleRequest(service, response)) return; //If we're still here, generate a response! } </pre> * * @param service Directive, typically extracted from the first path segment * after the servlet path in the request URL. Options include "login", * "logoff" (or "logout"), and "whoami". * @param response An HttpServletResponse object to be updated. * @return Returns true if this method was able to process the directive and * update the HttpServletResponse. Nothing else should be written to the * response. If false is returned, continue processing the request and * generate your own response. */ public boolean handleRequest(String service, HttpServletResponse response) throws ServletException, IOException { //Send NTLM response as needed boolean ntlm = (authType!=null && authType.equals("NTLM")); if (ntlm){ String ua = request.getHeader("user-agent"); if (ua!=null){ if (ua.contains("MSIE ") || ua.contains("Trident/") || ua.contains("Edge/") || ua.contains("Edg/")){ if (sendNTLMResponse(request, response)) return true; } else{ ntlm = false; } } } boolean requestHandled = true; if (service.equals("login")){ String username = getUsername(); if (username==null){ if (ntlm){ response.setStatus(401, "Access Denied"); response.setHeader("WWW-Authenticate", "NTLM"); } else{ response.setStatus(401, "Access Denied"); response.setHeader("WWW-Authenticate", "Basic realm=\"Access Denied\""); //<--Prompt the user for thier credentials response.setHeader("Cache-Control", "no-cache, no-transform"); response.setContentType("text/plain"); response.write("Unauthorized"); } } else{ try{ request.authenticate(); User user = getUser(); response.setContentType("text/plain"); response.write(user.getID()+""); } catch(Exception e){ response.setStatus(403, "Not Authorized"); response.setHeader("Cache-Control", "no-cache, no-transform"); response.setContentType("text/plain"); response.write("Unauthorized"); } } } else if (service.equals("logoff") || service.equalsIgnoreCase("logout")){ String username = getUsername(); if (username!=null){ synchronized(cache){ cache.remove(username); cache.notifyAll(); } } if (ntlm){ response.setStatus(401, "Access Denied"); response.setHeader("WWW-Authenticate", "NTLM"); } else{ response.setStatus(401, "Access Denied"); Boolean prompt = new javaxt.utils.Value(request.getParameter("prompt")).toBoolean(); //<--Hack for Firefox if (prompt!=null && prompt==true){ response.setHeader("WWW-Authenticate", "Basic realm=\"" + "This site is restricted. Please enter your username and password.\""); } response.setHeader("Cache-Control", "no-cache, no-transform"); response.setContentType("text/plain"); response.write("Unauthorized"); } } else if (service.equals("whoami")){ User user = getUser(); if (user==null){ //If the request has credentials, try authenticating the user String username = getUsername(); if (!(username==null || username.equals("logout"))){ try{ request.authenticate(); user = getUser(); } catch(Exception e){} } } if (user==null){ response.setStatus(400, "Bad Request"); response.write(""); } else{ response.setHeader("Cache-Control", "no-cache, no-transform"); response.setContentType("text/plain"); response.write(user.getID()+""); } } else{ requestHandled = false; } return requestHandled; } //************************************************************************** //** sendNTLMResponse //************************************************************************** /** Returns true if an NTLM response was returned to the client */ public static boolean sendNTLMResponse(HttpServletRequest request, HttpServletResponse response){ String authorization = request.getHeader("Authorization"); if (authorization==null){ response.setStatus(response.SC_UNAUTHORIZED); response.setHeader("WWW-Authenticate", "NTLM"); response.setContentLength(0); return true; } else{ byte[] msg = javaxt.utils.Base64.decode(authorization.substring(5)); if (msg[8] == 1) { //Send NTLM type2 response response.setStatus(response.SC_UNAUTHORIZED); response.setHeader("WWW-Authenticate", "NTLM " + NTLM_TYPE_2); response.setContentLength(0); return true; } } return false; } private static String NTLM_TYPE_2; static{ byte z = 0; byte[] msg1 = { (byte) 'N', (byte) 'T', (byte) 'L', (byte) 'M', //ntlm (byte) 'S', (byte) 'S', (byte) 'P', //ssp z, (byte) 2, //type 2 z, z, z, z, z, z, z, (byte) 40, z, z, z, (byte) 1, (byte) 130, (byte) 8, //super important! z, z, (byte) 2, (byte) 2, (byte) 2, z, z, z, z, z, z, z, z, z, z, z, z }; NTLM_TYPE_2 = javaxt.utils.Base64.encode(msg1).trim(); } } |
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