y - Net Developer

Recommendations

Info

CHAPTER 7 ■ IMPLEMENTING WCF SECURITY 215ramrameshreddy.blog.comHow can you address these security concerns? What does WCF offer to counter theseissues? You’ll take a closer look at what WCF has to offer in the next section.Introducing the WCF Security FeaturesMicrosoft has invested a lot of effort in guaranteeing the security in the Vista platform.Microsoft counterparts viewed its security as a weakness in the early 1990s. Since then,Microsoft has done a commendable job shrugging off that stigma. You may remember theinitiative to ensure “secure code” and the “trusted access security” campaigns that Microsoftimplemented to address this issue. Microsoft’s objective was to educate developers so they willaddress security needs in the fundamental design.Windows 2003 Server implemented security as “highest security turned on” by default.You had to downgrade the security privileges to obtain access to resources. WCF is also basedon the “guilty until proven innocent” and “all user input is evil” concepts. Any distributedapplication is prone to many forms of malicious attacks by intruders. The modern distributedsoftware architectures leverage public networks such as the Internet to send businesssensitiveinformation. This information can be compromised at various locations (such as bypacket sniffing on the wire, malicious systems administrators at routing destinations, and soon). Therefore, the security model for WCF needs to be comprehensive to handle all thesethreats. The core of WCF security is to address four important features:Confidentiality: Is the information confidential between the sender and the receiver? Thisfeature will ensure that “unauthorized” parties do not get the opportunity to view themessage. You usually achieve this by utilizing encryption algorithms.Integrity: This feature ensures that the receiver of the message gets the same informationthat the sender sends without any data tampering. You usually sign messages using digitalsignatures to achieve integrity.Authentication: This is to verify who the sender is and who the receiver is. Are they knownto the system or the application?Authorization: At the authorization stage, you know who the sender or the receiver is.However, you also need to know whether they are authorized to perform the action theyare requesting from the application.These are the key features the WCF security model attempts to address. You achieve thephysical implementation of addressing these issues by configuring bindings in WCF. WCFoffers a rich set of binding to address these security issues. You also have the flexibility ofextending or creating custom bindings to address specific security needs if necessary. In thenext section, you’ll investigate how to use bindings in WCF to implement security.ramrameshreddyramrameshreddySecurity Features of BindingsBindings define one or more WS-* protocols that WCF supports. Every binding addresses twoimportant aspects of messaging. These aspects are the encoding and transport of the message.Encoding defines the way messages are serialized. Transport defines the mechanisms that getthe messages from the sender to the receiver. Let’s look at the BasicHttpBinding binding as anexample. It uses the WS-I Basic Profile XML encoding and HTTP for transport. This binding is
amrameshreddy.blog.com216 CHAPTER 7 ■ IMPLEMENTING WCF SECURITYramrameshreddy.blog.comdesigned to support interoperable scenarios with other platforms. Therefore, it does not implementsecurity by default. (However, you can extend this binding to implement security byutilizing custom code.) You need to utilize WsHttpBinding or WsDualHttpBinding to implementsecurity.■Note Please consult Chapter 3 for an extensive discussion of bindings. This chapter will concentrateonly on the security implications and extensions of bindings. However, it is important to note that the binaryencodedbindings (that is, Net*Binding) require WCF on both the sender and the receiver ends because ofoptimization and performance reasons. NetMsmqBinding is used for asynchronous scenarios.NetTcpBinding and NetNamedPipeBinding support reliable sessions and transactions.You can also build your custom binding by utilizing the System.ServiceModel.Channelsnamespace. You can define security features, encoding, and serialization options that are suitableto your requirements using the classes available in this namespace. Similarly, you canalso utilize the ProtectionLevel binding property to enforce integrity and confidentiality. Theoptions available for the ProtectionLevel property are as follows:None: Only authenticate the binding.Sign: Ensure integrity in the transmitted data.EncryptAndSign: Ensure both confidentially and integrity.Protection LevelsWCF security encrypts and signs the messages by default. This could lead to “overkill” in someinstances. Therefore, you can implement integrity where confidentiality is not a requirement(such as when debugging code by developers). In such cases, WCF provides the facility to setthe protection level on the message. The following application file snippet illustrates how toachieve this using configuration files; the messages are required to be signed only before theyare sent:ramrameshreddyramrameshreddyMessage exchange patterns (MEPs) determine how the messages are sent from the senderto the receiver. How are these message patterns implemented in WCF? Can you implement securityon all these bindings for one-way and request-reply patterns? WCF does implement security
Page 1 and 2:
amrameshreddy.blog.comTHE EXPERT’
Page 3 and 4:
amrameshreddy.blog.comPro WCF: Prac
Page 5 and 6:
amrameshreddy.blog.comramrameshredd
Page 10 and 11:
amrameshreddy.blog.comApplying Beha
Page 13 and 14:
amrameshreddy.blog.comxii ■CONTEN
Page 15 and 16:
amrameshreddy.blog.comxiv ■CONTEN
Page 17 and 18:
Page 19 and 20:
amrameshreddy.blog.comxviii ■FORE
Page 21 and 22:
amrameshreddy.blog.comxx ■ABOUT T
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
amrameshreddy.blog.comxxviii ■INT
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
amrameshreddy.blog.com4 CHAPTER 1
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196: amrameshreddy.blog.com164 CHAPTER 5
Page 209 and 210: amrameshreddy.blog.comramrameshredd
Page 245: amrameshreddy.blog.com214 CHAPTER 7
Page 297 and 298:
Page 299 and 300:
Page 301 and 302:
Page 303 and 304:
Page 305 and 306:
Page 307 and 308:
Page 309 and 310:
Page 311 and 312:
Page 313 and 314:
Page 315 and 316:
Page 317 and 318:
Page 319 and 320:
Page 321 and 322:
Page 323 and 324:
Page 325 and 326:
Page 327 and 328:
Page 329 and 330:
Page 331 and 332:
Page 333 and 334:
Page 335 and 336:
Page 337 and 338:
Page 339 and 340:
Page 341 and 342:
Page 343 and 344:
Page 345 and 346:
Page 347 and 348:
Page 349 and 350:
Page 351 and 352:
Page 353 and 354:
Page 355 and 356:
Page 357 and 358:
Page 359 and 360:
Page 361 and 362:
Page 363 and 364:
Page 365 and 366:
Page 367 and 368:
Page 369 and 370:
Page 371 and 372:
Page 373 and 374:
Page 375 and 376:
Page 377 and 378:
Page 379 and 380:
Page 381 and 382:
Page 383 and 384:
Page 385 and 386:
Page 387 and 388:
Page 389 and 390:
Page 391 and 392:
Page 393 and 394:
Page 395 and 396:
Page 397 and 398:
Page 399 and 400:
Page 401 and 402:
Page 403 and 404:
Page 405 and 406:
Page 407 and 408:
Page 409 and 410:
Page 411 and 412:
Page 413 and 414:
Page 415 and 416:
Page 417 and 418:
Page 419 and 420:
Page 421 and 422:
Page 423 and 424:
Page 425 and 426:
Page 427 and 428:
Page 429 and 430:
Page 431 and 432:
Page 433 and 434:
Page 435 and 436:
Page 437 and 438:
Page 439 and 440:
Page 441 and 442:
Page 443 and 444:
Page 445 and 446:
Page 447 and 448:
Page 449 and 450:
Page 451 and 452:
Page 453 and 454:
Page 455 and 456:
Page 457 and 458:
amrameshreddy.blog.com426 APPENDIX
Page 459 and 460:
Page 461 and 462:
Page 463 and 464:
Page 465 and 466:
Page 467 and 468:
Page 469 and 470:
Page 471 and 472:
Page 473 and 474:
Page 475 and 476:
Page 477 and 478:
Page 479 and 480:
Page 481 and 482:
Page 483 and 484:
Page 485 and 486:
Page 487 and 488:
amrameshreddy.blog.com456 ■INDEXr
Page 489 and 490:
Page 491 and 492:
Page 493 and 494:
Page 495 and 496:
Page 497 and 498:
Page 499 and 500:
Page 501 and 502:
Page 503 and 504:
Page 505 and 506:
show all

y - Net Developer

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?