1 /* 2 * SSL3 Protocol 3 * 4 * This Source Code Form is subject to the terms of the Mozilla Public 5 * License, v. 2.0. If a copy of the MPL was not distributed with this 6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 7 8 /* TLS extension code moved here from ssl3ecc.c */ 9 10 #include "nssrenam.h" 11 #include "nss.h" 12 #include "ssl.h" 13 #include "sslimpl.h" 14 #include "sslproto.h" 15 #include "pk11pub.h" 16 #ifdef NO_PKCS11_BYPASS 17 #include "blapit.h" 18 #else 19 #include "blapi.h" 20 #endif 21 #include "prinit.h" 22 23 static unsigned char key_name[SESS_TICKET_KEY_NAME_LEN]; 24 static PK11SymKey *session_ticket_enc_key_pkcs11 = NULL; 25 static PK11SymKey *session_ticket_mac_key_pkcs11 = NULL; 26 27 #ifndef NO_PKCS11_BYPASS 28 static unsigned char session_ticket_enc_key[AES_256_KEY_LENGTH]; 29 static unsigned char session_ticket_mac_key[SHA256_LENGTH]; 30 31 static PRBool session_ticket_keys_initialized = PR_FALSE; 32 #endif 33 static PRCallOnceType generate_session_keys_once; 34 35 /* forward static function declarations */ 36 static SECStatus ssl3_ParseEncryptedSessionTicket(sslSocket *ss, 37 SECItem *data, EncryptedSessionTicket *enc_session_ticket); 38 static SECStatus ssl3_AppendToItem(SECItem *item, const unsigned char *buf, 39 PRUint32 bytes); 40 static SECStatus ssl3_AppendNumberToItem(SECItem *item, PRUint32 num, 41 PRInt32 lenSize); 42 static SECStatus ssl3_GetSessionTicketKeysPKCS11(sslSocket *ss, 43 PK11SymKey **aes_key, PK11SymKey **mac_key); 44 #ifndef NO_PKCS11_BYPASS 45 static SECStatus ssl3_GetSessionTicketKeys(const unsigned char **aes_key, 46 PRUint32 *aes_key_length, const unsigned char **mac_key, 47 PRUint32 *mac_key_length); 48 #endif 49 static PRInt32 ssl3_SendRenegotiationInfoXtn(sslSocket * ss, 50 PRBool append, PRUint32 maxBytes); 51 static SECStatus ssl3_HandleRenegotiationInfoXtn(sslSocket *ss, 52 PRUint16 ex_type, SECItem *data); 53 static SECStatus ssl3_ClientHandleNextProtoNegoXtn(sslSocket *ss, 54 PRUint16 ex_type, SECItem *data); 55 static SECStatus ssl3_ClientHandleAppProtoXtn(sslSocket *ss, 56 PRUint16 ex_type, SECItem *data); 57 static SECStatus ssl3_ServerHandleNextProtoNegoXtn(sslSocket *ss, 58 PRUint16 ex_type, SECItem *data); 59 static PRInt32 ssl3_ClientSendAppProtoXtn(sslSocket *ss, PRBool append, 60 PRUint32 maxBytes); 61 static PRInt32 ssl3_ClientSendNextProtoNegoXtn(sslSocket *ss, PRBool append, 62 PRUint32 maxBytes); 63 static PRInt32 ssl3_SendUseSRTPXtn(sslSocket *ss, PRBool append, 64 PRUint32 maxBytes); 65 static SECStatus ssl3_HandleUseSRTPXtn(sslSocket * ss, PRUint16 ex_type, 66 SECItem *data); 67 static SECStatus ssl3_ClientHandleChannelIDXtn(sslSocket *ss, 68 PRUint16 ex_type, SECItem *data); 69 static PRInt32 ssl3_ClientSendChannelIDXtn(sslSocket *ss, PRBool append, 70 PRUint32 maxBytes); 71 static SECStatus ssl3_ServerSendStatusRequestXtn(sslSocket * ss, 72 PRBool append, PRUint32 maxBytes); 73 static SECStatus ssl3_ServerHandleStatusRequestXtn(sslSocket *ss, 74 PRUint16 ex_type, SECItem *data); 75 static SECStatus ssl3_ClientHandleStatusRequestXtn(sslSocket *ss, 76 PRUint16 ex_type, 77 SECItem *data); 78 static PRInt32 ssl3_ClientSendStatusRequestXtn(sslSocket * ss, PRBool append, 79 PRUint32 maxBytes); 80 static PRInt32 ssl3_ClientSendSigAlgsXtn(sslSocket *ss, PRBool append, 81 PRUint32 maxBytes); 82 static SECStatus ssl3_ServerHandleSigAlgsXtn(sslSocket *ss, PRUint16 ex_type, 83 SECItem *data); 84 static PRInt32 ssl3_ClientSendSignedCertTimestampXtn(sslSocket *ss, 85 PRBool append, 86 PRUint32 maxBytes); 87 static SECStatus ssl3_ClientHandleSignedCertTimestampXtn(sslSocket *ss, 88 PRUint16 ex_type, 89 SECItem *data); 90 91 /* 92 * Write bytes. Using this function means the SECItem structure 93 * cannot be freed. The caller is expected to call this function 94 * on a shallow copy of the structure. 95 */ 96 static SECStatus 97 ssl3_AppendToItem(SECItem *item, const unsigned char *buf, PRUint32 bytes) 98 { 99 if (bytes > item->len) 100 return SECFailure; 101 102 PORT_Memcpy(item->data, buf, bytes); 103 item->data += bytes; 104 item->len -= bytes; 105 return SECSuccess; 106 } 107 108 /* 109 * Write a number in network byte order. Using this function means the 110 * SECItem structure cannot be freed. The caller is expected to call 111 * this function on a shallow copy of the structure. 112 */ 113 static SECStatus 114 ssl3_AppendNumberToItem(SECItem *item, PRUint32 num, PRInt32 lenSize) 115 { 116 SECStatus rv; 117 PRUint8 b[4]; 118 PRUint8 * p = b; 119 120 switch (lenSize) { 121 case 4: 122 *p++ = (PRUint8) (num >> 24); 123 case 3: 124 *p++ = (PRUint8) (num >> 16); 125 case 2: 126 *p++ = (PRUint8) (num >> 8); 127 case 1: 128 *p = (PRUint8) num; 129 } 130 rv = ssl3_AppendToItem(item, &b[0], lenSize); 131 return rv; 132 } 133 134 static SECStatus ssl3_SessionTicketShutdown(void* appData, void* nssData) 135 { 136 if (session_ticket_enc_key_pkcs11) { 137 PK11_FreeSymKey(session_ticket_enc_key_pkcs11); 138 session_ticket_enc_key_pkcs11 = NULL; 139 } 140 if (session_ticket_mac_key_pkcs11) { 141 PK11_FreeSymKey(session_ticket_mac_key_pkcs11); 142 session_ticket_mac_key_pkcs11 = NULL; 143 } 144 PORT_Memset(&generate_session_keys_once, 0, 145 sizeof(generate_session_keys_once)); 146 return SECSuccess; 147 } 148 149 150 static PRStatus 151 ssl3_GenerateSessionTicketKeysPKCS11(void *data) 152 { 153 SECStatus rv; 154 sslSocket *ss = (sslSocket *)data; 155 SECKEYPrivateKey *svrPrivKey = ss->serverCerts[kt_rsa].SERVERKEY; 156 SECKEYPublicKey *svrPubKey = ss->serverCerts[kt_rsa].serverKeyPair->pubKey; 157 158 if (svrPrivKey == NULL || svrPubKey == NULL) { 159 SSL_DBG(("%d: SSL[%d]: Pub or priv key(s) is NULL.", 160 SSL_GETPID(), ss->fd)); 161 goto loser; 162 } 163 164 /* Get a copy of the session keys from shared memory. */ 165 PORT_Memcpy(key_name, SESS_TICKET_KEY_NAME_PREFIX, 166 sizeof(SESS_TICKET_KEY_NAME_PREFIX)); 167 if (!ssl_GetSessionTicketKeysPKCS11(svrPrivKey, svrPubKey, 168 ss->pkcs11PinArg, &key_name[SESS_TICKET_KEY_NAME_PREFIX_LEN], 169 &session_ticket_enc_key_pkcs11, &session_ticket_mac_key_pkcs11)) 170 return PR_FAILURE; 171 172 rv = NSS_RegisterShutdown(ssl3_SessionTicketShutdown, NULL); 173 if (rv != SECSuccess) 174 goto loser; 175 176 return PR_SUCCESS; 177 178 loser: 179 ssl3_SessionTicketShutdown(NULL, NULL); 180 return PR_FAILURE; 181 } 182 183 static SECStatus 184 ssl3_GetSessionTicketKeysPKCS11(sslSocket *ss, PK11SymKey **aes_key, 185 PK11SymKey **mac_key) 186 { 187 if (PR_CallOnceWithArg(&generate_session_keys_once, 188 ssl3_GenerateSessionTicketKeysPKCS11, ss) != PR_SUCCESS) 189 return SECFailure; 190 191 if (session_ticket_enc_key_pkcs11 == NULL || 192 session_ticket_mac_key_pkcs11 == NULL) 193 return SECFailure; 194 195 *aes_key = session_ticket_enc_key_pkcs11; 196 *mac_key = session_ticket_mac_key_pkcs11; 197 return SECSuccess; 198 } 199 200 #ifndef NO_PKCS11_BYPASS 201 static PRStatus 202 ssl3_GenerateSessionTicketKeys(void) 203 { 204 PORT_Memcpy(key_name, SESS_TICKET_KEY_NAME_PREFIX, 205 sizeof(SESS_TICKET_KEY_NAME_PREFIX)); 206 207 if (!ssl_GetSessionTicketKeys(&key_name[SESS_TICKET_KEY_NAME_PREFIX_LEN], 208 session_ticket_enc_key, session_ticket_mac_key)) 209 return PR_FAILURE; 210 211 session_ticket_keys_initialized = PR_TRUE; 212 return PR_SUCCESS; 213 } 214 215 static SECStatus 216 ssl3_GetSessionTicketKeys(const unsigned char **aes_key, 217 PRUint32 *aes_key_length, const unsigned char **mac_key, 218 PRUint32 *mac_key_length) 219 { 220 if (PR_CallOnce(&generate_session_keys_once, 221 ssl3_GenerateSessionTicketKeys) != PR_SUCCESS) 222 return SECFailure; 223 224 if (!session_ticket_keys_initialized) 225 return SECFailure; 226 227 *aes_key = session_ticket_enc_key; 228 *aes_key_length = sizeof(session_ticket_enc_key); 229 *mac_key = session_ticket_mac_key; 230 *mac_key_length = sizeof(session_ticket_mac_key); 231 232 return SECSuccess; 233 } 234 #endif 235 236 /* Table of handlers for received TLS hello extensions, one per extension. 237 * In the second generation, this table will be dynamic, and functions 238 * will be registered here. 239 */ 240 /* This table is used by the server, to handle client hello extensions. */ 241 static const ssl3HelloExtensionHandler clientHelloHandlers[] = { 242 { ssl_server_name_xtn, &ssl3_HandleServerNameXtn }, 243 #ifdef NSS_ENABLE_ECC 244 { ssl_elliptic_curves_xtn, &ssl3_HandleSupportedCurvesXtn }, 245 { ssl_ec_point_formats_xtn, &ssl3_HandleSupportedPointFormatsXtn }, 246 #endif 247 { ssl_session_ticket_xtn, &ssl3_ServerHandleSessionTicketXtn }, 248 { ssl_renegotiation_info_xtn, &ssl3_HandleRenegotiationInfoXtn }, 249 { ssl_next_proto_nego_xtn, &ssl3_ServerHandleNextProtoNegoXtn }, 250 { ssl_use_srtp_xtn, &ssl3_HandleUseSRTPXtn }, 251 { ssl_cert_status_xtn, &ssl3_ServerHandleStatusRequestXtn }, 252 { ssl_signature_algorithms_xtn, &ssl3_ServerHandleSigAlgsXtn }, 253 { -1, NULL } 254 }; 255 256 /* These two tables are used by the client, to handle server hello 257 * extensions. */ 258 static const ssl3HelloExtensionHandler serverHelloHandlersTLS[] = { 259 { ssl_server_name_xtn, &ssl3_HandleServerNameXtn }, 260 /* TODO: add a handler for ssl_ec_point_formats_xtn */ 261 { ssl_session_ticket_xtn, &ssl3_ClientHandleSessionTicketXtn }, 262 { ssl_renegotiation_info_xtn, &ssl3_HandleRenegotiationInfoXtn }, 263 { ssl_next_proto_nego_xtn, &ssl3_ClientHandleNextProtoNegoXtn }, 264 { ssl_app_layer_protocol_xtn, &ssl3_ClientHandleAppProtoXtn }, 265 { ssl_use_srtp_xtn, &ssl3_HandleUseSRTPXtn }, 266 { ssl_channel_id_xtn, &ssl3_ClientHandleChannelIDXtn }, 267 { ssl_cert_status_xtn, &ssl3_ClientHandleStatusRequestXtn }, 268 { ssl_signed_certificate_timestamp_xtn, 269 &ssl3_ClientHandleSignedCertTimestampXtn }, 270 { -1, NULL } 271 }; 272 273 static const ssl3HelloExtensionHandler serverHelloHandlersSSL3[] = { 274 { ssl_renegotiation_info_xtn, &ssl3_HandleRenegotiationInfoXtn }, 275 { -1, NULL } 276 }; 277 278 /* Tables of functions to format TLS hello extensions, one function per 279 * extension. 280 * These static tables are for the formatting of client hello extensions. 281 * The server's table of hello senders is dynamic, in the socket struct, 282 * and sender functions are registered there. 283 */ 284 static const 285 ssl3HelloExtensionSender clientHelloSendersTLS[SSL_MAX_EXTENSIONS] = { 286 { ssl_server_name_xtn, &ssl3_SendServerNameXtn }, 287 { ssl_renegotiation_info_xtn, &ssl3_SendRenegotiationInfoXtn }, 288 #ifdef NSS_ENABLE_ECC 289 { ssl_elliptic_curves_xtn, &ssl3_SendSupportedCurvesXtn }, 290 { ssl_ec_point_formats_xtn, &ssl3_SendSupportedPointFormatsXtn }, 291 #endif 292 { ssl_session_ticket_xtn, &ssl3_SendSessionTicketXtn }, 293 { ssl_next_proto_nego_xtn, &ssl3_ClientSendNextProtoNegoXtn }, 294 { ssl_app_layer_protocol_xtn, &ssl3_ClientSendAppProtoXtn }, 295 { ssl_use_srtp_xtn, &ssl3_SendUseSRTPXtn }, 296 { ssl_channel_id_xtn, &ssl3_ClientSendChannelIDXtn }, 297 { ssl_cert_status_xtn, &ssl3_ClientSendStatusRequestXtn }, 298 { ssl_signature_algorithms_xtn, &ssl3_ClientSendSigAlgsXtn }, 299 { ssl_signed_certificate_timestamp_xtn, 300 &ssl3_ClientSendSignedCertTimestampXtn } 301 /* any extra entries will appear as { 0, NULL } */ 302 }; 303 304 static const 305 ssl3HelloExtensionSender clientHelloSendersSSL3[SSL_MAX_EXTENSIONS] = { 306 { ssl_renegotiation_info_xtn, &ssl3_SendRenegotiationInfoXtn } 307 /* any extra entries will appear as { 0, NULL } */ 308 }; 309 310 static PRBool 311 arrayContainsExtension(const PRUint16 *array, PRUint32 len, PRUint16 ex_type) 312 { 313 int i; 314 for (i = 0; i < len; i++) { 315 if (ex_type == array[i]) 316 return PR_TRUE; 317 } 318 return PR_FALSE; 319 } 320 321 PRBool 322 ssl3_ExtensionNegotiated(sslSocket *ss, PRUint16 ex_type) { 323 TLSExtensionData *xtnData = &ss->xtnData; 324 return arrayContainsExtension(xtnData->negotiated, 325 xtnData->numNegotiated, ex_type); 326 } 327 328 static PRBool 329 ssl3_ClientExtensionAdvertised(sslSocket *ss, PRUint16 ex_type) { 330 TLSExtensionData *xtnData = &ss->xtnData; 331 return arrayContainsExtension(xtnData->advertised, 332 xtnData->numAdvertised, ex_type); 333 } 334 335 /* Format an SNI extension, using the name from the socket's URL, 336 * unless that name is a dotted decimal string. 337 * Used by client and server. 338 */ 339 PRInt32 340 ssl3_SendServerNameXtn(sslSocket * ss, PRBool append, 341 PRUint32 maxBytes) 342 { 343 SECStatus rv; 344 if (!ss) 345 return 0; 346 if (!ss->sec.isServer) { 347 PRUint32 len; 348 PRNetAddr netAddr; 349 350 /* must have a hostname */ 351 if (!ss->url || !ss->url[0]) 352 return 0; 353 /* must not be an IPv4 or IPv6 address */ 354 if (PR_SUCCESS == PR_StringToNetAddr(ss->url, &netAddr)) { 355 /* is an IP address (v4 or v6) */ 356 return 0; 357 } 358 len = PORT_Strlen(ss->url); 359 if (append && maxBytes >= len + 9) { 360 /* extension_type */ 361 rv = ssl3_AppendHandshakeNumber(ss, ssl_server_name_xtn, 2); 362 if (rv != SECSuccess) return -1; 363 /* length of extension_data */ 364 rv = ssl3_AppendHandshakeNumber(ss, len + 5, 2); 365 if (rv != SECSuccess) return -1; 366 /* length of server_name_list */ 367 rv = ssl3_AppendHandshakeNumber(ss, len + 3, 2); 368 if (rv != SECSuccess) return -1; 369 /* Name Type (sni_host_name) */ 370 rv = ssl3_AppendHandshake(ss, "\0", 1); 371 if (rv != SECSuccess) return -1; 372 /* HostName (length and value) */ 373 rv = ssl3_AppendHandshakeVariable(ss, (PRUint8 *)ss->url, len, 2); 374 if (rv != SECSuccess) return -1; 375 if (!ss->sec.isServer) { 376 TLSExtensionData *xtnData = &ss->xtnData; 377 xtnData->advertised[xtnData->numAdvertised++] = 378 ssl_server_name_xtn; 379 } 380 } 381 return len + 9; 382 } 383 /* Server side */ 384 if (append && maxBytes >= 4) { 385 rv = ssl3_AppendHandshakeNumber(ss, ssl_server_name_xtn, 2); 386 if (rv != SECSuccess) return -1; 387 /* length of extension_data */ 388 rv = ssl3_AppendHandshakeNumber(ss, 0, 2); 389 if (rv != SECSuccess) return -1; 390 } 391 return 4; 392 } 393 394 /* handle an incoming SNI extension, by ignoring it. */ 395 SECStatus 396 ssl3_HandleServerNameXtn(sslSocket * ss, PRUint16 ex_type, SECItem *data) 397 { 398 SECItem *names = NULL; 399 PRUint32 listCount = 0, namesPos = 0, i; 400 TLSExtensionData *xtnData = &ss->xtnData; 401 SECItem ldata; 402 PRInt32 listLenBytes = 0; 403 404 if (!ss->sec.isServer) { 405 /* Verify extension_data is empty. */ 406 if (data->data || data->len || 407 !ssl3_ExtensionNegotiated(ss, ssl_server_name_xtn)) { 408 /* malformed or was not initiated by the client.*/ 409 return SECFailure; 410 } 411 return SECSuccess; 412 } 413 414 /* Server side - consume client data and register server sender. */ 415 /* do not parse the data if don't have user extension handling function. */ 416 if (!ss->sniSocketConfig) { 417 return SECSuccess; 418 } 419 /* length of server_name_list */ 420 listLenBytes = ssl3_ConsumeHandshakeNumber(ss, 2, &data->data, &data->len); 421 if (listLenBytes == 0 || listLenBytes != data->len) { 422 return SECFailure; 423 } 424 ldata = *data; 425 /* Calculate the size of the array.*/ 426 while (listLenBytes > 0) { 427 SECItem litem; 428 SECStatus rv; 429 PRInt32 type; 430 /* Name Type (sni_host_name) */ 431 type = ssl3_ConsumeHandshakeNumber(ss, 1, &ldata.data, &ldata.len); 432 if (!ldata.len) { 433 return SECFailure; 434 } 435 rv = ssl3_ConsumeHandshakeVariable(ss, &litem, 2, &ldata.data, &ldata.len); 436 if (rv != SECSuccess) { 437 return SECFailure; 438 } 439 /* Adjust total length for cunsumed item, item len and type.*/ 440 listLenBytes -= litem.len + 3; 441 if (listLenBytes > 0 && !ldata.len) { 442 return SECFailure; 443 } 444 listCount += 1; 445 } 446 if (!listCount) { 447 return SECFailure; 448 } 449 names = PORT_ZNewArray(SECItem, listCount); 450 if (!names) { 451 return SECFailure; 452 } 453 for (i = 0;i < listCount;i++) { 454 int j; 455 PRInt32 type; 456 SECStatus rv; 457 PRBool nametypePresent = PR_FALSE; 458 /* Name Type (sni_host_name) */ 459 type = ssl3_ConsumeHandshakeNumber(ss, 1, &data->data, &data->len); 460 /* Check if we have such type in the list */ 461 for (j = 0;j < listCount && names[j].data;j++) { 462 if (names[j].type == type) { 463 nametypePresent = PR_TRUE; 464 break; 465 } 466 } 467 /* HostName (length and value) */ 468 rv = ssl3_ConsumeHandshakeVariable(ss, &names[namesPos], 2, 469 &data->data, &data->len); 470 if (rv != SECSuccess) { 471 goto loser; 472 } 473 if (nametypePresent == PR_FALSE) { 474 namesPos += 1; 475 } 476 } 477 /* Free old and set the new data. */ 478 if (xtnData->sniNameArr) { 479 PORT_Free(ss->xtnData.sniNameArr); 480 } 481 xtnData->sniNameArr = names; 482 xtnData->sniNameArrSize = namesPos; 483 xtnData->negotiated[xtnData->numNegotiated++] = ssl_server_name_xtn; 484 485 return SECSuccess; 486 487 loser: 488 PORT_Free(names); 489 return SECFailure; 490 } 491 492 /* Called by both clients and servers. 493 * Clients sends a filled in session ticket if one is available, and otherwise 494 * sends an empty ticket. Servers always send empty tickets. 495 */ 496 PRInt32 497 ssl3_SendSessionTicketXtn( 498 sslSocket * ss, 499 PRBool append, 500 PRUint32 maxBytes) 501 { 502 PRInt32 extension_length; 503 NewSessionTicket *session_ticket = NULL; 504 505 /* Ignore the SessionTicket extension if processing is disabled. */ 506 if (!ss->opt.enableSessionTickets) 507 return 0; 508 509 /* Empty extension length = extension_type (2-bytes) + 510 * length(extension_data) (2-bytes) 511 */ 512 extension_length = 4; 513 514 /* If we are a client then send a session ticket if one is availble. 515 * Servers that support the extension and are willing to negotiate the 516 * the extension always respond with an empty extension. 517 */ 518 if (!ss->sec.isServer) { 519 sslSessionID *sid = ss->sec.ci.sid; 520 session_ticket = &sid->u.ssl3.sessionTicket; 521 if (session_ticket->ticket.data) { 522 if (ss->xtnData.ticketTimestampVerified) { 523 extension_length += session_ticket->ticket.len; 524 } else if (!append && 525 (session_ticket->ticket_lifetime_hint == 0 || 526 (session_ticket->ticket_lifetime_hint + 527 session_ticket->received_timestamp > ssl_Time()))) { 528 extension_length += session_ticket->ticket.len; 529 ss->xtnData.ticketTimestampVerified = PR_TRUE; 530 } 531 } 532 } 533 534 if (append && maxBytes >= extension_length) { 535 SECStatus rv; 536 /* extension_type */ 537 rv = ssl3_AppendHandshakeNumber(ss, ssl_session_ticket_xtn, 2); 538 if (rv != SECSuccess) 539 goto loser; 540 if (session_ticket && session_ticket->ticket.data && 541 ss->xtnData.ticketTimestampVerified) { 542 rv = ssl3_AppendHandshakeVariable(ss, session_ticket->ticket.data, 543 session_ticket->ticket.len, 2); 544 ss->xtnData.ticketTimestampVerified = PR_FALSE; 545 } else { 546 rv = ssl3_AppendHandshakeNumber(ss, 0, 2); 547 } 548 if (rv != SECSuccess) 549 goto loser; 550 551 if (!ss->sec.isServer) { 552 TLSExtensionData *xtnData = &ss->xtnData; 553 xtnData->advertised[xtnData->numAdvertised++] = 554 ssl_session_ticket_xtn; 555 } 556 } else if (maxBytes < extension_length) { 557 PORT_Assert(0); 558 return 0; 559 } 560 return extension_length; 561 562 loser: 563 ss->xtnData.ticketTimestampVerified = PR_FALSE; 564 return -1; 565 } 566 567 /* handle an incoming Next Protocol Negotiation extension. */ 568 static SECStatus 569 ssl3_ServerHandleNextProtoNegoXtn(sslSocket * ss, PRUint16 ex_type, SECItem *data) 570 { 571 if (ss->firstHsDone || data->len != 0) { 572 /* Clients MUST send an empty NPN extension, if any. */ 573 PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID); 574 return SECFailure; 575 } 576 577 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 578 579 /* TODO: server side NPN support would require calling 580 * ssl3_RegisterServerHelloExtensionSender here in order to echo the 581 * extension back to the client. */ 582 583 return SECSuccess; 584 } 585 586 /* ssl3_ValidateNextProtoNego checks that the given block of data is valid: none 587 * of the lengths may be 0 and the sum of the lengths must equal the length of 588 * the block. */ 589 SECStatus 590 ssl3_ValidateNextProtoNego(const unsigned char* data, unsigned int length) 591 { 592 unsigned int offset = 0; 593 594 while (offset < length) { 595 unsigned int newOffset = offset + 1 + (unsigned int) data[offset]; 596 /* Reject embedded nulls to protect against buggy applications that 597 * store protocol identifiers in null-terminated strings. 598 */ 599 if (newOffset > length || data[offset] == 0) { 600 PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID); 601 return SECFailure; 602 } 603 offset = newOffset; 604 } 605 606 if (offset > length) { 607 PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID); 608 return SECFailure; 609 } 610 611 return SECSuccess; 612 } 613 614 static SECStatus 615 ssl3_ClientHandleNextProtoNegoXtn(sslSocket *ss, PRUint16 ex_type, 616 SECItem *data) 617 { 618 SECStatus rv; 619 unsigned char resultBuffer[255]; 620 SECItem result = { siBuffer, resultBuffer, 0 }; 621 622 PORT_Assert(!ss->firstHsDone); 623 624 if (ssl3_ExtensionNegotiated(ss, ssl_app_layer_protocol_xtn)) { 625 PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); 626 return SECFailure; 627 } 628 629 rv = ssl3_ValidateNextProtoNego(data->data, data->len); 630 if (rv != SECSuccess) 631 return rv; 632 633 /* ss->nextProtoCallback cannot normally be NULL if we negotiated the 634 * extension. However, It is possible that an application erroneously 635 * cleared the callback between the time we sent the ClientHello and now. 636 */ 637 PORT_Assert(ss->nextProtoCallback != NULL); 638 if (!ss->nextProtoCallback) { 639 /* XXX Use a better error code. This is an application error, not an 640 * NSS bug. */ 641 PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); 642 return SECFailure; 643 } 644 645 rv = ss->nextProtoCallback(ss->nextProtoArg, ss->fd, data->data, data->len, 646 result.data, &result.len, sizeof resultBuffer); 647 if (rv != SECSuccess) 648 return rv; 649 /* If the callback wrote more than allowed to |result| it has corrupted our 650 * stack. */ 651 if (result.len > sizeof resultBuffer) { 652 PORT_SetError(SEC_ERROR_OUTPUT_LEN); 653 return SECFailure; 654 } 655 656 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 657 658 SECITEM_FreeItem(&ss->ssl3.nextProto, PR_FALSE); 659 return SECITEM_CopyItem(NULL, &ss->ssl3.nextProto, &result); 660 } 661 662 static SECStatus 663 ssl3_ClientHandleAppProtoXtn(sslSocket *ss, PRUint16 ex_type, SECItem *data) 664 { 665 const unsigned char* d = data->data; 666 PRUint16 name_list_len; 667 SECItem protocol_name; 668 669 if (ssl3_ExtensionNegotiated(ss, ssl_next_proto_nego_xtn)) { 670 PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); 671 return SECFailure; 672 } 673 674 /* The extension data from the server has the following format: 675 * uint16 name_list_len; 676 * uint8 len; 677 * uint8 protocol_name[len]; */ 678 if (data->len < 4 || data->len > 2 + 1 + 255) { 679 PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID); 680 return SECFailure; 681 } 682 683 name_list_len = ((PRUint16) d[0]) << 8 | 684 ((PRUint16) d[1]); 685 if (name_list_len != data->len - 2 || 686 d[2] != data->len - 3) { 687 PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID); 688 return SECFailure; 689 } 690 691 protocol_name.data = data->data + 3; 692 protocol_name.len = data->len - 3; 693 694 SECITEM_FreeItem(&ss->ssl3.nextProto, PR_FALSE); 695 ss->ssl3.nextProtoState = SSL_NEXT_PROTO_SELECTED; 696 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 697 return SECITEM_CopyItem(NULL, &ss->ssl3.nextProto, &protocol_name); 698 } 699 700 static PRInt32 701 ssl3_ClientSendNextProtoNegoXtn(sslSocket * ss, PRBool append, 702 PRUint32 maxBytes) 703 { 704 PRInt32 extension_length; 705 706 /* Renegotiations do not send this extension. */ 707 if (!ss->nextProtoCallback || ss->firstHsDone) { 708 return 0; 709 } 710 711 extension_length = 4; 712 713 if (append && maxBytes >= extension_length) { 714 SECStatus rv; 715 rv = ssl3_AppendHandshakeNumber(ss, ssl_next_proto_nego_xtn, 2); 716 if (rv != SECSuccess) 717 goto loser; 718 rv = ssl3_AppendHandshakeNumber(ss, 0, 2); 719 if (rv != SECSuccess) 720 goto loser; 721 ss->xtnData.advertised[ss->xtnData.numAdvertised++] = 722 ssl_next_proto_nego_xtn; 723 } else if (maxBytes < extension_length) { 724 return 0; 725 } 726 727 return extension_length; 728 729 loser: 730 return -1; 731 } 732 733 static PRInt32 734 ssl3_ClientSendAppProtoXtn(sslSocket * ss, PRBool append, PRUint32 maxBytes) 735 { 736 PRInt32 extension_length; 737 unsigned char *alpn_protos = NULL; 738 739 /* Renegotiations do not send this extension. */ 740 if (!ss->opt.nextProtoNego.data || ss->firstHsDone) { 741 return 0; 742 } 743 744 extension_length = 2 /* extension type */ + 2 /* extension length */ + 745 2 /* protocol name list length */ + 746 ss->opt.nextProtoNego.len; 747 748 if (append && maxBytes >= extension_length) { 749 /* NPN requires that the client's fallback protocol is first in the 750 * list. However, ALPN sends protocols in preference order. So we 751 * allocate a buffer and move the first protocol to the end of the 752 * list. */ 753 SECStatus rv; 754 const unsigned int len = ss->opt.nextProtoNego.len; 755 756 alpn_protos = PORT_Alloc(len); 757 if (alpn_protos == NULL) { 758 return SECFailure; 759 } 760 if (len > 0) { 761 /* Each protocol string is prefixed with a single byte length. */ 762 unsigned int i = ss->opt.nextProtoNego.data[0] + 1; 763 if (i <= len) { 764 memcpy(alpn_protos, &ss->opt.nextProtoNego.data[i], len - i); 765 memcpy(alpn_protos + len - i, ss->opt.nextProtoNego.data, i); 766 } else { 767 /* This seems to be invalid data so we'll send as-is. */ 768 memcpy(alpn_protos, ss->opt.nextProtoNego.data, len); 769 } 770 } 771 772 rv = ssl3_AppendHandshakeNumber(ss, ssl_app_layer_protocol_xtn, 2); 773 if (rv != SECSuccess) 774 goto loser; 775 rv = ssl3_AppendHandshakeNumber(ss, extension_length - 4, 2); 776 if (rv != SECSuccess) 777 goto loser; 778 rv = ssl3_AppendHandshakeVariable(ss, alpn_protos, len, 2); 779 PORT_Free(alpn_protos); 780 alpn_protos = NULL; 781 if (rv != SECSuccess) 782 goto loser; 783 ss->xtnData.advertised[ss->xtnData.numAdvertised++] = 784 ssl_app_layer_protocol_xtn; 785 } else if (maxBytes < extension_length) { 786 return 0; 787 } 788 789 return extension_length; 790 791 loser: 792 if (alpn_protos) 793 PORT_Free(alpn_protos); 794 return -1; 795 } 796 797 static SECStatus 798 ssl3_ClientHandleChannelIDXtn(sslSocket *ss, PRUint16 ex_type, 799 SECItem *data) 800 { 801 PORT_Assert(ss->getChannelID != NULL); 802 803 if (data->len) { 804 PORT_SetError(SSL_ERROR_BAD_CHANNEL_ID_DATA); 805 return SECFailure; 806 } 807 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 808 return SECSuccess; 809 } 810 811 static PRInt32 812 ssl3_ClientSendChannelIDXtn(sslSocket * ss, PRBool append, 813 PRUint32 maxBytes) 814 { 815 PRInt32 extension_length = 4; 816 817 if (!ss->getChannelID) 818 return 0; 819 820 if (maxBytes < extension_length) { 821 PORT_Assert(0); 822 return 0; 823 } 824 825 if (ss->sec.ci.sid->cached != never_cached && 826 ss->sec.ci.sid->u.ssl3.originalHandshakeHash.len == 0) { 827 /* We can't do ChannelID on a connection if we're resuming and didn't 828 * do ChannelID on the original connection: without ChannelID on the 829 * original connection we didn't record the handshake hashes needed for 830 * the signature. */ 831 return 0; 832 } 833 834 if (append) { 835 SECStatus rv; 836 rv = ssl3_AppendHandshakeNumber(ss, ssl_channel_id_xtn, 2); 837 if (rv != SECSuccess) 838 goto loser; 839 rv = ssl3_AppendHandshakeNumber(ss, 0, 2); 840 if (rv != SECSuccess) 841 goto loser; 842 ss->xtnData.advertised[ss->xtnData.numAdvertised++] = 843 ssl_channel_id_xtn; 844 } 845 846 return extension_length; 847 848 loser: 849 return -1; 850 } 851 852 static SECStatus 853 ssl3_ClientHandleStatusRequestXtn(sslSocket *ss, PRUint16 ex_type, 854 SECItem *data) 855 { 856 /* The echoed extension must be empty. */ 857 if (data->len != 0) 858 return SECFailure; 859 860 /* Keep track of negotiated extensions. */ 861 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 862 863 return SECSuccess; 864 } 865 866 static PRInt32 867 ssl3_ServerSendStatusRequestXtn( 868 sslSocket * ss, 869 PRBool append, 870 PRUint32 maxBytes) 871 { 872 PRInt32 extension_length; 873 SECStatus rv; 874 int i; 875 PRBool haveStatus = PR_FALSE; 876 877 for (i = kt_null; i < kt_kea_size; i++) { 878 /* TODO: This is a temporary workaround. 879 * The correct code needs to see if we have an OCSP response for 880 * the server certificate being used, rather than if we have any 881 * OCSP response. See also ssl3_SendCertificateStatus. 882 */ 883 if (ss->certStatusArray[i] && ss->certStatusArray[i]->len) { 884 haveStatus = PR_TRUE; 885 break; 886 } 887 } 888 if (!haveStatus) 889 return 0; 890 891 extension_length = 2 + 2; 892 if (append && maxBytes >= extension_length) { 893 /* extension_type */ 894 rv = ssl3_AppendHandshakeNumber(ss, ssl_cert_status_xtn, 2); 895 if (rv != SECSuccess) 896 return -1; 897 /* length of extension_data */ 898 rv = ssl3_AppendHandshakeNumber(ss, 0, 2); 899 if (rv != SECSuccess) 900 return -1; 901 } 902 903 return extension_length; 904 } 905 906 /* ssl3_ClientSendStatusRequestXtn builds the status_request extension on the 907 * client side. See RFC 4366 section 3.6. */ 908 static PRInt32 909 ssl3_ClientSendStatusRequestXtn(sslSocket * ss, PRBool append, 910 PRUint32 maxBytes) 911 { 912 PRInt32 extension_length; 913 914 if (!ss->opt.enableOCSPStapling) 915 return 0; 916 917 /* extension_type (2-bytes) + 918 * length(extension_data) (2-bytes) + 919 * status_type (1) + 920 * responder_id_list length (2) + 921 * request_extensions length (2) 922 */ 923 extension_length = 9; 924 925 if (append && maxBytes >= extension_length) { 926 SECStatus rv; 927 TLSExtensionData *xtnData; 928 929 /* extension_type */ 930 rv = ssl3_AppendHandshakeNumber(ss, ssl_cert_status_xtn, 2); 931 if (rv != SECSuccess) 932 return -1; 933 rv = ssl3_AppendHandshakeNumber(ss, extension_length - 4, 2); 934 if (rv != SECSuccess) 935 return -1; 936 rv = ssl3_AppendHandshakeNumber(ss, 1 /* status_type ocsp */, 1); 937 if (rv != SECSuccess) 938 return -1; 939 /* A zero length responder_id_list means that the responders are 940 * implicitly known to the server. */ 941 rv = ssl3_AppendHandshakeNumber(ss, 0, 2); 942 if (rv != SECSuccess) 943 return -1; 944 /* A zero length request_extensions means that there are no extensions. 945 * Specifically, we don't set the id-pkix-ocsp-nonce extension. This 946 * means that the server can replay a cached OCSP response to us. */ 947 rv = ssl3_AppendHandshakeNumber(ss, 0, 2); 948 if (rv != SECSuccess) 949 return -1; 950 951 xtnData = &ss->xtnData; 952 xtnData->advertised[xtnData->numAdvertised++] = ssl_cert_status_xtn; 953 } else if (maxBytes < extension_length) { 954 PORT_Assert(0); 955 return 0; 956 } 957 return extension_length; 958 } 959 960 /* 961 * NewSessionTicket 962 * Called from ssl3_HandleFinished 963 */ 964 SECStatus 965 ssl3_SendNewSessionTicket(sslSocket *ss) 966 { 967 int i; 968 SECStatus rv; 969 NewSessionTicket ticket; 970 SECItem plaintext; 971 SECItem plaintext_item = {0, NULL, 0}; 972 SECItem ciphertext = {0, NULL, 0}; 973 PRUint32 ciphertext_length; 974 PRBool ms_is_wrapped; 975 unsigned char wrapped_ms[SSL3_MASTER_SECRET_LENGTH]; 976 SECItem ms_item = {0, NULL, 0}; 977 SSL3KEAType effectiveExchKeyType = ssl_kea_null; 978 PRUint32 padding_length; 979 PRUint32 message_length; 980 PRUint32 cert_length; 981 PRUint8 length_buf[4]; 982 PRUint32 now; 983 PK11SymKey *aes_key_pkcs11; 984 PK11SymKey *mac_key_pkcs11; 985 #ifndef NO_PKCS11_BYPASS 986 const unsigned char *aes_key; 987 const unsigned char *mac_key; 988 PRUint32 aes_key_length; 989 PRUint32 mac_key_length; 990 PRUint64 aes_ctx_buf[MAX_CIPHER_CONTEXT_LLONGS]; 991 AESContext *aes_ctx; 992 const SECHashObject *hashObj = NULL; 993 PRUint64 hmac_ctx_buf[MAX_MAC_CONTEXT_LLONGS]; 994 HMACContext *hmac_ctx; 995 #endif 996 CK_MECHANISM_TYPE cipherMech = CKM_AES_CBC; 997 PK11Context *aes_ctx_pkcs11; 998 CK_MECHANISM_TYPE macMech = CKM_SHA256_HMAC; 999 PK11Context *hmac_ctx_pkcs11; 1000 unsigned char computed_mac[TLS_EX_SESS_TICKET_MAC_LENGTH]; 1001 unsigned int computed_mac_length; 1002 unsigned char iv[AES_BLOCK_SIZE]; 1003 SECItem ivItem; 1004 SECItem *srvName = NULL; 1005 PRUint32 srvNameLen = 0; 1006 CK_MECHANISM_TYPE msWrapMech = 0; /* dummy default value, 1007 * must be >= 0 */ 1008 1009 SSL_TRC(3, ("%d: SSL3[%d]: send session_ticket handshake", 1010 SSL_GETPID(), ss->fd)); 1011 1012 PORT_Assert( ss->opt.noLocks || ssl_HaveXmitBufLock(ss)); 1013 PORT_Assert( ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); 1014 1015 ticket.ticket_lifetime_hint = TLS_EX_SESS_TICKET_LIFETIME_HINT; 1016 cert_length = (ss->opt.requestCertificate && ss->sec.ci.sid->peerCert) ? 1017 3 + ss->sec.ci.sid->peerCert->derCert.len : 0; 1018 1019 /* Get IV and encryption keys */ 1020 ivItem.data = iv; 1021 ivItem.len = sizeof(iv); 1022 rv = PK11_GenerateRandom(iv, sizeof(iv)); 1023 if (rv != SECSuccess) goto loser; 1024 1025 #ifndef NO_PKCS11_BYPASS 1026 if (ss->opt.bypassPKCS11) { 1027 rv = ssl3_GetSessionTicketKeys(&aes_key, &aes_key_length, 1028 &mac_key, &mac_key_length); 1029 } else 1030 #endif 1031 { 1032 rv = ssl3_GetSessionTicketKeysPKCS11(ss, &aes_key_pkcs11, 1033 &mac_key_pkcs11); 1034 } 1035 if (rv != SECSuccess) goto loser; 1036 1037 if (ss->ssl3.pwSpec->msItem.len && ss->ssl3.pwSpec->msItem.data) { 1038 /* The master secret is available unwrapped. */ 1039 ms_item.data = ss->ssl3.pwSpec->msItem.data; 1040 ms_item.len = ss->ssl3.pwSpec->msItem.len; 1041 ms_is_wrapped = PR_FALSE; 1042 } else { 1043 /* Extract the master secret wrapped. */ 1044 sslSessionID sid; 1045 PORT_Memset(&sid, 0, sizeof(sslSessionID)); 1046 1047 if (ss->ssl3.hs.kea_def->kea == kea_ecdhe_rsa) { 1048 effectiveExchKeyType = kt_rsa; 1049 } else { 1050 effectiveExchKeyType = ss->ssl3.hs.kea_def->exchKeyType; 1051 } 1052 1053 rv = ssl3_CacheWrappedMasterSecret(ss, &sid, ss->ssl3.pwSpec, 1054 effectiveExchKeyType); 1055 if (rv == SECSuccess) { 1056 if (sid.u.ssl3.keys.wrapped_master_secret_len > sizeof(wrapped_ms)) 1057 goto loser; 1058 memcpy(wrapped_ms, sid.u.ssl3.keys.wrapped_master_secret, 1059 sid.u.ssl3.keys.wrapped_master_secret_len); 1060 ms_item.data = wrapped_ms; 1061 ms_item.len = sid.u.ssl3.keys.wrapped_master_secret_len; 1062 msWrapMech = sid.u.ssl3.masterWrapMech; 1063 } else { 1064 /* TODO: else send an empty ticket. */ 1065 goto loser; 1066 } 1067 ms_is_wrapped = PR_TRUE; 1068 } 1069 /* Prep to send negotiated name */ 1070 srvName = &ss->ssl3.pwSpec->srvVirtName; 1071 if (srvName->data && srvName->len) { 1072 srvNameLen = 2 + srvName->len; /* len bytes + name len */ 1073 } 1074 1075 ciphertext_length = 1076 sizeof(PRUint16) /* ticket_version */ 1077 + sizeof(SSL3ProtocolVersion) /* ssl_version */ 1078 + sizeof(ssl3CipherSuite) /* ciphersuite */ 1079 + 1 /* compression */ 1080 + 10 /* cipher spec parameters */ 1081 + 1 /* SessionTicket.ms_is_wrapped */ 1082 + 1 /* effectiveExchKeyType */ 1083 + 4 /* msWrapMech */ 1084 + 2 /* master_secret.length */ 1085 + ms_item.len /* master_secret */ 1086 + 1 /* client_auth_type */ 1087 + cert_length /* cert */ 1088 + 1 /* server name type */ 1089 + srvNameLen /* name len + length field */ 1090 + sizeof(ticket.ticket_lifetime_hint); 1091 padding_length = AES_BLOCK_SIZE - 1092 (ciphertext_length % AES_BLOCK_SIZE); 1093 ciphertext_length += padding_length; 1094 1095 message_length = 1096 sizeof(ticket.ticket_lifetime_hint) /* ticket_lifetime_hint */ 1097 + 2 /* length field for NewSessionTicket.ticket */ 1098 + SESS_TICKET_KEY_NAME_LEN /* key_name */ 1099 + AES_BLOCK_SIZE /* iv */ 1100 + 2 /* length field for NewSessionTicket.ticket.encrypted_state */ 1101 + ciphertext_length /* encrypted_state */ 1102 + TLS_EX_SESS_TICKET_MAC_LENGTH; /* mac */ 1103 1104 if (SECITEM_AllocItem(NULL, &plaintext_item, ciphertext_length) == NULL) 1105 goto loser; 1106 1107 plaintext = plaintext_item; 1108 1109 /* ticket_version */ 1110 rv = ssl3_AppendNumberToItem(&plaintext, TLS_EX_SESS_TICKET_VERSION, 1111 sizeof(PRUint16)); 1112 if (rv != SECSuccess) goto loser; 1113 1114 /* ssl_version */ 1115 rv = ssl3_AppendNumberToItem(&plaintext, ss->version, 1116 sizeof(SSL3ProtocolVersion)); 1117 if (rv != SECSuccess) goto loser; 1118 1119 /* ciphersuite */ 1120 rv = ssl3_AppendNumberToItem(&plaintext, ss->ssl3.hs.cipher_suite, 1121 sizeof(ssl3CipherSuite)); 1122 if (rv != SECSuccess) goto loser; 1123 1124 /* compression */ 1125 rv = ssl3_AppendNumberToItem(&plaintext, ss->ssl3.hs.compression, 1); 1126 if (rv != SECSuccess) goto loser; 1127 1128 /* cipher spec parameters */ 1129 rv = ssl3_AppendNumberToItem(&plaintext, ss->sec.authAlgorithm, 1); 1130 if (rv != SECSuccess) goto loser; 1131 rv = ssl3_AppendNumberToItem(&plaintext, ss->sec.authKeyBits, 4); 1132 if (rv != SECSuccess) goto loser; 1133 rv = ssl3_AppendNumberToItem(&plaintext, ss->sec.keaType, 1); 1134 if (rv != SECSuccess) goto loser; 1135 rv = ssl3_AppendNumberToItem(&plaintext, ss->sec.keaKeyBits, 4); 1136 if (rv != SECSuccess) goto loser; 1137 1138 /* master_secret */ 1139 rv = ssl3_AppendNumberToItem(&plaintext, ms_is_wrapped, 1); 1140 if (rv != SECSuccess) goto loser; 1141 rv = ssl3_AppendNumberToItem(&plaintext, effectiveExchKeyType, 1); 1142 if (rv != SECSuccess) goto loser; 1143 rv = ssl3_AppendNumberToItem(&plaintext, msWrapMech, 4); 1144 if (rv != SECSuccess) goto loser; 1145 rv = ssl3_AppendNumberToItem(&plaintext, ms_item.len, 2); 1146 if (rv != SECSuccess) goto loser; 1147 rv = ssl3_AppendToItem(&plaintext, ms_item.data, ms_item.len); 1148 if (rv != SECSuccess) goto loser; 1149 1150 /* client_identity */ 1151 if (ss->opt.requestCertificate && ss->sec.ci.sid->peerCert) { 1152 rv = ssl3_AppendNumberToItem(&plaintext, CLIENT_AUTH_CERTIFICATE, 1); 1153 if (rv != SECSuccess) goto loser; 1154 rv = ssl3_AppendNumberToItem(&plaintext, 1155 ss->sec.ci.sid->peerCert->derCert.len, 3); 1156 if (rv != SECSuccess) goto loser; 1157 rv = ssl3_AppendToItem(&plaintext, 1158 ss->sec.ci.sid->peerCert->derCert.data, 1159 ss->sec.ci.sid->peerCert->derCert.len); 1160 if (rv != SECSuccess) goto loser; 1161 } else { 1162 rv = ssl3_AppendNumberToItem(&plaintext, 0, 1); 1163 if (rv != SECSuccess) goto loser; 1164 } 1165 1166 /* timestamp */ 1167 now = ssl_Time(); 1168 rv = ssl3_AppendNumberToItem(&plaintext, now, 1169 sizeof(ticket.ticket_lifetime_hint)); 1170 if (rv != SECSuccess) goto loser; 1171 1172 if (srvNameLen) { 1173 /* Name Type (sni_host_name) */ 1174 rv = ssl3_AppendNumberToItem(&plaintext, srvName->type, 1); 1175 if (rv != SECSuccess) goto loser; 1176 /* HostName (length and value) */ 1177 rv = ssl3_AppendNumberToItem(&plaintext, srvName->len, 2); 1178 if (rv != SECSuccess) goto loser; 1179 rv = ssl3_AppendToItem(&plaintext, srvName->data, srvName->len); 1180 if (rv != SECSuccess) goto loser; 1181 } else { 1182 /* No Name */ 1183 rv = ssl3_AppendNumberToItem(&plaintext, (char)TLS_STE_NO_SERVER_NAME, 1184 1); 1185 if (rv != SECSuccess) goto loser; 1186 } 1187 1188 PORT_Assert(plaintext.len == padding_length); 1189 for (i = 0; i < padding_length; i++) 1190 plaintext.data[i] = (unsigned char)padding_length; 1191 1192 if (SECITEM_AllocItem(NULL, &ciphertext, ciphertext_length) == NULL) { 1193 rv = SECFailure; 1194 goto loser; 1195 } 1196 1197 /* Generate encrypted portion of ticket. */ 1198 #ifndef NO_PKCS11_BYPASS 1199 if (ss->opt.bypassPKCS11) { 1200 aes_ctx = (AESContext *)aes_ctx_buf; 1201 rv = AES_InitContext(aes_ctx, aes_key, aes_key_length, iv, 1202 NSS_AES_CBC, 1, AES_BLOCK_SIZE); 1203 if (rv != SECSuccess) goto loser; 1204 1205 rv = AES_Encrypt(aes_ctx, ciphertext.data, &ciphertext.len, 1206 ciphertext.len, plaintext_item.data, 1207 plaintext_item.len); 1208 if (rv != SECSuccess) goto loser; 1209 } else 1210 #endif 1211 { 1212 aes_ctx_pkcs11 = PK11_CreateContextBySymKey(cipherMech, 1213 CKA_ENCRYPT, aes_key_pkcs11, &ivItem); 1214 if (!aes_ctx_pkcs11) 1215 goto loser; 1216 1217 rv = PK11_CipherOp(aes_ctx_pkcs11, ciphertext.data, 1218 (int *)&ciphertext.len, ciphertext.len, 1219 plaintext_item.data, plaintext_item.len); 1220 PK11_Finalize(aes_ctx_pkcs11); 1221 PK11_DestroyContext(aes_ctx_pkcs11, PR_TRUE); 1222 if (rv != SECSuccess) goto loser; 1223 } 1224 1225 /* Convert ciphertext length to network order. */ 1226 length_buf[0] = (ciphertext.len >> 8) & 0xff; 1227 length_buf[1] = (ciphertext.len ) & 0xff; 1228 1229 /* Compute MAC. */ 1230 #ifndef NO_PKCS11_BYPASS 1231 if (ss->opt.bypassPKCS11) { 1232 hmac_ctx = (HMACContext *)hmac_ctx_buf; 1233 hashObj = HASH_GetRawHashObject(HASH_AlgSHA256); 1234 if (HMAC_Init(hmac_ctx, hashObj, mac_key, 1235 mac_key_length, PR_FALSE) != SECSuccess) 1236 goto loser; 1237 1238 HMAC_Begin(hmac_ctx); 1239 HMAC_Update(hmac_ctx, key_name, SESS_TICKET_KEY_NAME_LEN); 1240 HMAC_Update(hmac_ctx, iv, sizeof(iv)); 1241 HMAC_Update(hmac_ctx, (unsigned char *)length_buf, 2); 1242 HMAC_Update(hmac_ctx, ciphertext.data, ciphertext.len); 1243 HMAC_Finish(hmac_ctx, computed_mac, &computed_mac_length, 1244 sizeof(computed_mac)); 1245 } else 1246 #endif 1247 { 1248 SECItem macParam; 1249 macParam.data = NULL; 1250 macParam.len = 0; 1251 hmac_ctx_pkcs11 = PK11_CreateContextBySymKey(macMech, 1252 CKA_SIGN, mac_key_pkcs11, &macParam); 1253 if (!hmac_ctx_pkcs11) 1254 goto loser; 1255 1256 rv = PK11_DigestBegin(hmac_ctx_pkcs11); 1257 rv = PK11_DigestOp(hmac_ctx_pkcs11, key_name, 1258 SESS_TICKET_KEY_NAME_LEN); 1259 rv = PK11_DigestOp(hmac_ctx_pkcs11, iv, sizeof(iv)); 1260 rv = PK11_DigestOp(hmac_ctx_pkcs11, (unsigned char *)length_buf, 2); 1261 rv = PK11_DigestOp(hmac_ctx_pkcs11, ciphertext.data, ciphertext.len); 1262 rv = PK11_DigestFinal(hmac_ctx_pkcs11, computed_mac, 1263 &computed_mac_length, sizeof(computed_mac)); 1264 PK11_DestroyContext(hmac_ctx_pkcs11, PR_TRUE); 1265 if (rv != SECSuccess) goto loser; 1266 } 1267 1268 /* Serialize the handshake message. */ 1269 rv = ssl3_AppendHandshakeHeader(ss, new_session_ticket, message_length); 1270 if (rv != SECSuccess) goto loser; 1271 1272 rv = ssl3_AppendHandshakeNumber(ss, ticket.ticket_lifetime_hint, 1273 sizeof(ticket.ticket_lifetime_hint)); 1274 if (rv != SECSuccess) goto loser; 1275 1276 rv = ssl3_AppendHandshakeNumber(ss, 1277 message_length - sizeof(ticket.ticket_lifetime_hint) - 2, 2); 1278 if (rv != SECSuccess) goto loser; 1279 1280 rv = ssl3_AppendHandshake(ss, key_name, SESS_TICKET_KEY_NAME_LEN); 1281 if (rv != SECSuccess) goto loser; 1282 1283 rv = ssl3_AppendHandshake(ss, iv, sizeof(iv)); 1284 if (rv != SECSuccess) goto loser; 1285 1286 rv = ssl3_AppendHandshakeVariable(ss, ciphertext.data, ciphertext.len, 2); 1287 if (rv != SECSuccess) goto loser; 1288 1289 rv = ssl3_AppendHandshake(ss, computed_mac, computed_mac_length); 1290 if (rv != SECSuccess) goto loser; 1291 1292 loser: 1293 if (plaintext_item.data) 1294 SECITEM_FreeItem(&plaintext_item, PR_FALSE); 1295 if (ciphertext.data) 1296 SECITEM_FreeItem(&ciphertext, PR_FALSE); 1297 1298 return rv; 1299 } 1300 1301 /* When a client receives a SessionTicket extension a NewSessionTicket 1302 * message is expected during the handshake. 1303 */ 1304 SECStatus 1305 ssl3_ClientHandleSessionTicketXtn(sslSocket *ss, PRUint16 ex_type, 1306 SECItem *data) 1307 { 1308 if (data->len != 0) 1309 return SECFailure; 1310 1311 /* Keep track of negotiated extensions. */ 1312 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 1313 return SECSuccess; 1314 } 1315 1316 SECStatus 1317 ssl3_ServerHandleSessionTicketXtn(sslSocket *ss, PRUint16 ex_type, 1318 SECItem *data) 1319 { 1320 SECStatus rv; 1321 SECItem *decrypted_state = NULL; 1322 SessionTicket *parsed_session_ticket = NULL; 1323 sslSessionID *sid = NULL; 1324 SSL3Statistics *ssl3stats; 1325 1326 /* Ignore the SessionTicket extension if processing is disabled. */ 1327 if (!ss->opt.enableSessionTickets) 1328 return SECSuccess; 1329 1330 /* Keep track of negotiated extensions. */ 1331 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 1332 1333 /* Parse the received ticket sent in by the client. We are 1334 * lenient about some parse errors, falling back to a fullshake 1335 * instead of terminating the current connection. 1336 */ 1337 if (data->len == 0) { 1338 ss->xtnData.emptySessionTicket = PR_TRUE; 1339 } else { 1340 int i; 1341 SECItem extension_data; 1342 EncryptedSessionTicket enc_session_ticket; 1343 unsigned char computed_mac[TLS_EX_SESS_TICKET_MAC_LENGTH]; 1344 unsigned int computed_mac_length; 1345 #ifndef NO_PKCS11_BYPASS 1346 const SECHashObject *hashObj; 1347 const unsigned char *aes_key; 1348 const unsigned char *mac_key; 1349 PRUint32 aes_key_length; 1350 PRUint32 mac_key_length; 1351 PRUint64 hmac_ctx_buf[MAX_MAC_CONTEXT_LLONGS]; 1352 HMACContext *hmac_ctx; 1353 PRUint64 aes_ctx_buf[MAX_CIPHER_CONTEXT_LLONGS]; 1354 AESContext *aes_ctx; 1355 #endif 1356 PK11SymKey *aes_key_pkcs11; 1357 PK11SymKey *mac_key_pkcs11; 1358 PK11Context *hmac_ctx_pkcs11; 1359 CK_MECHANISM_TYPE macMech = CKM_SHA256_HMAC; 1360 PK11Context *aes_ctx_pkcs11; 1361 CK_MECHANISM_TYPE cipherMech = CKM_AES_CBC; 1362 unsigned char * padding; 1363 PRUint32 padding_length; 1364 unsigned char *buffer; 1365 unsigned int buffer_len; 1366 PRInt32 temp; 1367 SECItem cert_item; 1368 PRInt8 nameType = TLS_STE_NO_SERVER_NAME; 1369 1370 /* Turn off stateless session resumption if the client sends a 1371 * SessionTicket extension, even if the extension turns out to be 1372 * malformed (ss->sec.ci.sid is non-NULL when doing session 1373 * renegotiation.) 1374 */ 1375 if (ss->sec.ci.sid != NULL) { 1376 if (ss->sec.uncache) 1377 ss->sec.uncache(ss->sec.ci.sid); 1378 ssl_FreeSID(ss->sec.ci.sid); 1379 ss->sec.ci.sid = NULL; 1380 } 1381 1382 extension_data.data = data->data; /* Keep a copy for future use. */ 1383 extension_data.len = data->len; 1384 1385 if (ssl3_ParseEncryptedSessionTicket(ss, data, &enc_session_ticket) 1386 != SECSuccess) 1387 return SECFailure; 1388 1389 /* Get session ticket keys. */ 1390 #ifndef NO_PKCS11_BYPASS 1391 if (ss->opt.bypassPKCS11) { 1392 rv = ssl3_GetSessionTicketKeys(&aes_key, &aes_key_length, 1393 &mac_key, &mac_key_length); 1394 } else 1395 #endif 1396 { 1397 rv = ssl3_GetSessionTicketKeysPKCS11(ss, &aes_key_pkcs11, 1398 &mac_key_pkcs11); 1399 } 1400 if (rv != SECSuccess) { 1401 SSL_DBG(("%d: SSL[%d]: Unable to get/generate session ticket keys.", 1402 SSL_GETPID(), ss->fd)); 1403 goto loser; 1404 } 1405 1406 /* If the ticket sent by the client was generated under a key different 1407 * from the one we have, bypass ticket processing. 1408 */ 1409 if (PORT_Memcmp(enc_session_ticket.key_name, key_name, 1410 SESS_TICKET_KEY_NAME_LEN) != 0) { 1411 SSL_DBG(("%d: SSL[%d]: Session ticket key_name sent mismatch.", 1412 SSL_GETPID(), ss->fd)); 1413 goto no_ticket; 1414 } 1415 1416 /* Verify the MAC on the ticket. MAC verification may also 1417 * fail if the MAC key has been recently refreshed. 1418 */ 1419 #ifndef NO_PKCS11_BYPASS 1420 if (ss->opt.bypassPKCS11) { 1421 hmac_ctx = (HMACContext *)hmac_ctx_buf; 1422 hashObj = HASH_GetRawHashObject(HASH_AlgSHA256); 1423 if (HMAC_Init(hmac_ctx, hashObj, mac_key, 1424 sizeof(session_ticket_mac_key), PR_FALSE) != SECSuccess) 1425 goto no_ticket; 1426 HMAC_Begin(hmac_ctx); 1427 HMAC_Update(hmac_ctx, extension_data.data, 1428 extension_data.len - TLS_EX_SESS_TICKET_MAC_LENGTH); 1429 if (HMAC_Finish(hmac_ctx, computed_mac, &computed_mac_length, 1430 sizeof(computed_mac)) != SECSuccess) 1431 goto no_ticket; 1432 } else 1433 #endif 1434 { 1435 SECItem macParam; 1436 macParam.data = NULL; 1437 macParam.len = 0; 1438 hmac_ctx_pkcs11 = PK11_CreateContextBySymKey(macMech, 1439 CKA_SIGN, mac_key_pkcs11, &macParam); 1440 if (!hmac_ctx_pkcs11) { 1441 SSL_DBG(("%d: SSL[%d]: Unable to create HMAC context: %d.", 1442 SSL_GETPID(), ss->fd, PORT_GetError())); 1443 goto no_ticket; 1444 } else { 1445 SSL_DBG(("%d: SSL[%d]: Successfully created HMAC context.", 1446 SSL_GETPID(), ss->fd)); 1447 } 1448 rv = PK11_DigestBegin(hmac_ctx_pkcs11); 1449 rv = PK11_DigestOp(hmac_ctx_pkcs11, extension_data.data, 1450 extension_data.len - TLS_EX_SESS_TICKET_MAC_LENGTH); 1451 if (rv != SECSuccess) { 1452 PK11_DestroyContext(hmac_ctx_pkcs11, PR_TRUE); 1453 goto no_ticket; 1454 } 1455 rv = PK11_DigestFinal(hmac_ctx_pkcs11, computed_mac, 1456 &computed_mac_length, sizeof(computed_mac)); 1457 PK11_DestroyContext(hmac_ctx_pkcs11, PR_TRUE); 1458 if (rv != SECSuccess) 1459 goto no_ticket; 1460 } 1461 if (NSS_SecureMemcmp(computed_mac, enc_session_ticket.mac, 1462 computed_mac_length) != 0) { 1463 SSL_DBG(("%d: SSL[%d]: Session ticket MAC mismatch.", 1464 SSL_GETPID(), ss->fd)); 1465 goto no_ticket; 1466 } 1467 1468 /* We ignore key_name for now. 1469 * This is ok as MAC verification succeeded. 1470 */ 1471 1472 /* Decrypt the ticket. */ 1473 1474 /* Plaintext is shorter than the ciphertext due to padding. */ 1475 decrypted_state = SECITEM_AllocItem(NULL, NULL, 1476 enc_session_ticket.encrypted_state.len); 1477 1478 #ifndef NO_PKCS11_BYPASS 1479 if (ss->opt.bypassPKCS11) { 1480 aes_ctx = (AESContext *)aes_ctx_buf; 1481 rv = AES_InitContext(aes_ctx, aes_key, 1482 sizeof(session_ticket_enc_key), enc_session_ticket.iv, 1483 NSS_AES_CBC, 0,AES_BLOCK_SIZE); 1484 if (rv != SECSuccess) { 1485 SSL_DBG(("%d: SSL[%d]: Unable to create AES context.", 1486 SSL_GETPID(), ss->fd)); 1487 goto no_ticket; 1488 } 1489 1490 rv = AES_Decrypt(aes_ctx, decrypted_state->data, 1491 &decrypted_state->len, decrypted_state->len, 1492 enc_session_ticket.encrypted_state.data, 1493 enc_session_ticket.encrypted_state.len); 1494 if (rv != SECSuccess) 1495 goto no_ticket; 1496 } else 1497 #endif 1498 { 1499 SECItem ivItem; 1500 ivItem.data = enc_session_ticket.iv; 1501 ivItem.len = AES_BLOCK_SIZE; 1502 aes_ctx_pkcs11 = PK11_CreateContextBySymKey(cipherMech, 1503 CKA_DECRYPT, aes_key_pkcs11, &ivItem); 1504 if (!aes_ctx_pkcs11) { 1505 SSL_DBG(("%d: SSL[%d]: Unable to create AES context.", 1506 SSL_GETPID(), ss->fd)); 1507 goto no_ticket; 1508 } 1509 1510 rv = PK11_CipherOp(aes_ctx_pkcs11, decrypted_state->data, 1511 (int *)&decrypted_state->len, decrypted_state->len, 1512 enc_session_ticket.encrypted_state.data, 1513 enc_session_ticket.encrypted_state.len); 1514 PK11_Finalize(aes_ctx_pkcs11); 1515 PK11_DestroyContext(aes_ctx_pkcs11, PR_TRUE); 1516 if (rv != SECSuccess) 1517 goto no_ticket; 1518 } 1519 1520 /* Check padding. */ 1521 padding_length = 1522 (PRUint32)decrypted_state->data[decrypted_state->len - 1]; 1523 if (padding_length == 0 || padding_length > AES_BLOCK_SIZE) 1524 goto no_ticket; 1525 1526 padding = &decrypted_state->data[decrypted_state->len - padding_length]; 1527 for (i = 0; i < padding_length; i++, padding++) { 1528 if (padding_length != (PRUint32)*padding) 1529 goto no_ticket; 1530 } 1531 1532 /* Deserialize session state. */ 1533 buffer = decrypted_state->data; 1534 buffer_len = decrypted_state->len; 1535 1536 parsed_session_ticket = PORT_ZAlloc(sizeof(SessionTicket)); 1537 if (parsed_session_ticket == NULL) { 1538 rv = SECFailure; 1539 goto loser; 1540 } 1541 1542 /* Read ticket_version (which is ignored for now.) */ 1543 temp = ssl3_ConsumeHandshakeNumber(ss, 2, &buffer, &buffer_len); 1544 if (temp < 0) goto no_ticket; 1545 parsed_session_ticket->ticket_version = (SSL3ProtocolVersion)temp; 1546 1547 /* Read SSLVersion. */ 1548 temp = ssl3_ConsumeHandshakeNumber(ss, 2, &buffer, &buffer_len); 1549 if (temp < 0) goto no_ticket; 1550 parsed_session_ticket->ssl_version = (SSL3ProtocolVersion)temp; 1551 1552 /* Read cipher_suite. */ 1553 temp = ssl3_ConsumeHandshakeNumber(ss, 2, &buffer, &buffer_len); 1554 if (temp < 0) goto no_ticket; 1555 parsed_session_ticket->cipher_suite = (ssl3CipherSuite)temp; 1556 1557 /* Read compression_method. */ 1558 temp = ssl3_ConsumeHandshakeNumber(ss, 1, &buffer, &buffer_len); 1559 if (temp < 0) goto no_ticket; 1560 parsed_session_ticket->compression_method = (SSLCompressionMethod)temp; 1561 1562 /* Read cipher spec parameters. */ 1563 temp = ssl3_ConsumeHandshakeNumber(ss, 1, &buffer, &buffer_len); 1564 if (temp < 0) goto no_ticket; 1565 parsed_session_ticket->authAlgorithm = (SSLSignType)temp; 1566 temp = ssl3_ConsumeHandshakeNumber(ss, 4, &buffer, &buffer_len); 1567 if (temp < 0) goto no_ticket; 1568 parsed_session_ticket->authKeyBits = (PRUint32)temp; 1569 temp = ssl3_ConsumeHandshakeNumber(ss, 1, &buffer, &buffer_len); 1570 if (temp < 0) goto no_ticket; 1571 parsed_session_ticket->keaType = (SSLKEAType)temp; 1572 temp = ssl3_ConsumeHandshakeNumber(ss, 4, &buffer, &buffer_len); 1573 if (temp < 0) goto no_ticket; 1574 parsed_session_ticket->keaKeyBits = (PRUint32)temp; 1575 1576 /* Read wrapped master_secret. */ 1577 temp = ssl3_ConsumeHandshakeNumber(ss, 1, &buffer, &buffer_len); 1578 if (temp < 0) goto no_ticket; 1579 parsed_session_ticket->ms_is_wrapped = (PRBool)temp; 1580 1581 temp = ssl3_ConsumeHandshakeNumber(ss, 1, &buffer, &buffer_len); 1582 if (temp < 0) goto no_ticket; 1583 parsed_session_ticket->exchKeyType = (SSL3KEAType)temp; 1584 1585 temp = ssl3_ConsumeHandshakeNumber(ss, 4, &buffer, &buffer_len); 1586 if (temp < 0) goto no_ticket; 1587 parsed_session_ticket->msWrapMech = (CK_MECHANISM_TYPE)temp; 1588 1589 temp = ssl3_ConsumeHandshakeNumber(ss, 2, &buffer, &buffer_len); 1590 if (temp < 0) goto no_ticket; 1591 parsed_session_ticket->ms_length = (PRUint16)temp; 1592 if (parsed_session_ticket->ms_length == 0 || /* sanity check MS. */ 1593 parsed_session_ticket->ms_length > 1594 sizeof(parsed_session_ticket->master_secret)) 1595 goto no_ticket; 1596 1597 /* Allow for the wrapped master secret to be longer. */ 1598 if (buffer_len < sizeof(SSL3_MASTER_SECRET_LENGTH)) 1599 goto no_ticket; 1600 PORT_Memcpy(parsed_session_ticket->master_secret, buffer, 1601 parsed_session_ticket->ms_length); 1602 buffer += parsed_session_ticket->ms_length; 1603 buffer_len -= parsed_session_ticket->ms_length; 1604 1605 /* Read client_identity */ 1606 temp = ssl3_ConsumeHandshakeNumber(ss, 1, &buffer, &buffer_len); 1607 if (temp < 0) 1608 goto no_ticket; 1609 parsed_session_ticket->client_identity.client_auth_type = 1610 (ClientAuthenticationType)temp; 1611 switch(parsed_session_ticket->client_identity.client_auth_type) { 1612 case CLIENT_AUTH_ANONYMOUS: 1613 break; 1614 case CLIENT_AUTH_CERTIFICATE: 1615 rv = ssl3_ConsumeHandshakeVariable(ss, &cert_item, 3, 1616 &buffer, &buffer_len); 1617 if (rv != SECSuccess) goto no_ticket; 1618 rv = SECITEM_CopyItem(NULL, &parsed_session_ticket->peer_cert, 1619 &cert_item); 1620 if (rv != SECSuccess) goto no_ticket; 1621 break; 1622 default: 1623 goto no_ticket; 1624 } 1625 /* Read timestamp. */ 1626 temp = ssl3_ConsumeHandshakeNumber(ss, 4, &buffer, &buffer_len); 1627 if (temp < 0) 1628 goto no_ticket; 1629 parsed_session_ticket->timestamp = (PRUint32)temp; 1630 1631 /* Read server name */ 1632 nameType = 1633 ssl3_ConsumeHandshakeNumber(ss, 1, &buffer, &buffer_len); 1634 if (nameType != TLS_STE_NO_SERVER_NAME) { 1635 SECItem name_item; 1636 rv = ssl3_ConsumeHandshakeVariable(ss, &name_item, 2, &buffer, 1637 &buffer_len); 1638 if (rv != SECSuccess) goto no_ticket; 1639 rv = SECITEM_CopyItem(NULL, &parsed_session_ticket->srvName, 1640 &name_item); 1641 if (rv != SECSuccess) goto no_ticket; 1642 parsed_session_ticket->srvName.type = nameType; 1643 } 1644 1645 /* Done parsing. Check that all bytes have been consumed. */ 1646 if (buffer_len != padding_length) 1647 goto no_ticket; 1648 1649 /* Use the ticket if it has not expired, otherwise free the allocated 1650 * memory since the ticket is of no use. 1651 */ 1652 if (parsed_session_ticket->timestamp != 0 && 1653 parsed_session_ticket->timestamp + 1654 TLS_EX_SESS_TICKET_LIFETIME_HINT > ssl_Time()) { 1655 1656 sid = ssl3_NewSessionID(ss, PR_TRUE); 1657 if (sid == NULL) { 1658 rv = SECFailure; 1659 goto loser; 1660 } 1661 1662 /* Copy over parameters. */ 1663 sid->version = parsed_session_ticket->ssl_version; 1664 sid->u.ssl3.cipherSuite = parsed_session_ticket->cipher_suite; 1665 sid->u.ssl3.compression = parsed_session_ticket->compression_method; 1666 sid->authAlgorithm = parsed_session_ticket->authAlgorithm; 1667 sid->authKeyBits = parsed_session_ticket->authKeyBits; 1668 sid->keaType = parsed_session_ticket->keaType; 1669 sid->keaKeyBits = parsed_session_ticket->keaKeyBits; 1670 1671 /* Copy master secret. */ 1672 #ifndef NO_PKCS11_BYPASS 1673 if (ss->opt.bypassPKCS11 && 1674 parsed_session_ticket->ms_is_wrapped) 1675 goto no_ticket; 1676 #endif 1677 if (parsed_session_ticket->ms_length > 1678 sizeof(sid->u.ssl3.keys.wrapped_master_secret)) 1679 goto no_ticket; 1680 PORT_Memcpy(sid->u.ssl3.keys.wrapped_master_secret, 1681 parsed_session_ticket->master_secret, 1682 parsed_session_ticket->ms_length); 1683 sid->u.ssl3.keys.wrapped_master_secret_len = 1684 parsed_session_ticket->ms_length; 1685 sid->u.ssl3.exchKeyType = parsed_session_ticket->exchKeyType; 1686 sid->u.ssl3.masterWrapMech = parsed_session_ticket->msWrapMech; 1687 sid->u.ssl3.keys.msIsWrapped = 1688 parsed_session_ticket->ms_is_wrapped; 1689 sid->u.ssl3.masterValid = PR_TRUE; 1690 sid->u.ssl3.keys.resumable = PR_TRUE; 1691 1692 /* Copy over client cert from session ticket if there is one. */ 1693 if (parsed_session_ticket->peer_cert.data != NULL) { 1694 if (sid->peerCert != NULL) 1695 CERT_DestroyCertificate(sid->peerCert); 1696 sid->peerCert = CERT_NewTempCertificate(ss->dbHandle, 1697 &parsed_session_ticket->peer_cert, NULL, PR_FALSE, PR_TRUE); 1698 if (sid->peerCert == NULL) { 1699 rv = SECFailure; 1700 goto loser; 1701 } 1702 } 1703 if (parsed_session_ticket->srvName.data != NULL) { 1704 sid->u.ssl3.srvName = parsed_session_ticket->srvName; 1705 } 1706 ss->statelessResume = PR_TRUE; 1707 ss->sec.ci.sid = sid; 1708 } 1709 } 1710 1711 if (0) { 1712 no_ticket: 1713 SSL_DBG(("%d: SSL[%d]: Session ticket parsing failed.", 1714 SSL_GETPID(), ss->fd)); 1715 ssl3stats = SSL_GetStatistics(); 1716 SSL_AtomicIncrementLong(& ssl3stats->hch_sid_ticket_parse_failures ); 1717 } 1718 rv = SECSuccess; 1719 1720 loser: 1721 /* ss->sec.ci.sid == sid if it did NOT come here via goto statement 1722 * in that case do not free sid 1723 */ 1724 if (sid && (ss->sec.ci.sid != sid)) { 1725 ssl_FreeSID(sid); 1726 sid = NULL; 1727 } 1728 if (decrypted_state != NULL) { 1729 SECITEM_FreeItem(decrypted_state, PR_TRUE); 1730 decrypted_state = NULL; 1731 } 1732 1733 if (parsed_session_ticket != NULL) { 1734 if (parsed_session_ticket->peer_cert.data) { 1735 SECITEM_FreeItem(&parsed_session_ticket->peer_cert, PR_FALSE); 1736 } 1737 PORT_ZFree(parsed_session_ticket, sizeof(SessionTicket)); 1738 } 1739 1740 return rv; 1741 } 1742 1743 /* 1744 * Read bytes. Using this function means the SECItem structure 1745 * cannot be freed. The caller is expected to call this function 1746 * on a shallow copy of the structure. 1747 */ 1748 static SECStatus 1749 ssl3_ConsumeFromItem(SECItem *item, unsigned char **buf, PRUint32 bytes) 1750 { 1751 if (bytes > item->len) 1752 return SECFailure; 1753 1754 *buf = item->data; 1755 item->data += bytes; 1756 item->len -= bytes; 1757 return SECSuccess; 1758 } 1759 1760 static SECStatus 1761 ssl3_ParseEncryptedSessionTicket(sslSocket *ss, SECItem *data, 1762 EncryptedSessionTicket *enc_session_ticket) 1763 { 1764 if (ssl3_ConsumeFromItem(data, &enc_session_ticket->key_name, 1765 SESS_TICKET_KEY_NAME_LEN) != SECSuccess) 1766 return SECFailure; 1767 if (ssl3_ConsumeFromItem(data, &enc_session_ticket->iv, 1768 AES_BLOCK_SIZE) != SECSuccess) 1769 return SECFailure; 1770 if (ssl3_ConsumeHandshakeVariable(ss, &enc_session_ticket->encrypted_state, 1771 2, &data->data, &data->len) != SECSuccess) 1772 return SECFailure; 1773 if (ssl3_ConsumeFromItem(data, &enc_session_ticket->mac, 1774 TLS_EX_SESS_TICKET_MAC_LENGTH) != SECSuccess) 1775 return SECFailure; 1776 if (data->len != 0) /* Make sure that we have consumed all bytes. */ 1777 return SECFailure; 1778 1779 return SECSuccess; 1780 } 1781 1782 /* go through hello extensions in buffer "b". 1783 * For each one, find the extension handler in the table, and 1784 * if present, invoke that handler. 1785 * Servers ignore any extensions with unknown extension types. 1786 * Clients reject any extensions with unadvertised extension types. 1787 */ 1788 SECStatus 1789 ssl3_HandleHelloExtensions(sslSocket *ss, SSL3Opaque **b, PRUint32 *length) 1790 { 1791 const ssl3HelloExtensionHandler * handlers; 1792 1793 if (ss->sec.isServer) { 1794 handlers = clientHelloHandlers; 1795 } else if (ss->version > SSL_LIBRARY_VERSION_3_0) { 1796 handlers = serverHelloHandlersTLS; 1797 } else { 1798 handlers = serverHelloHandlersSSL3; 1799 } 1800 1801 while (*length) { 1802 const ssl3HelloExtensionHandler * handler; 1803 SECStatus rv; 1804 PRInt32 extension_type; 1805 SECItem extension_data; 1806 1807 /* Get the extension's type field */ 1808 extension_type = ssl3_ConsumeHandshakeNumber(ss, 2, b, length); 1809 if (extension_type < 0) /* failure to decode extension_type */ 1810 return SECFailure; /* alert already sent */ 1811 1812 /* get the data for this extension, so we can pass it or skip it. */ 1813 rv = ssl3_ConsumeHandshakeVariable(ss, &extension_data, 2, b, length); 1814 if (rv != SECSuccess) 1815 return rv; 1816 1817 /* Check whether the server sent an extension which was not advertised 1818 * in the ClientHello. 1819 */ 1820 if (!ss->sec.isServer && 1821 !ssl3_ClientExtensionAdvertised(ss, extension_type)) 1822 return SECFailure; /* TODO: send unsupported_extension alert */ 1823 1824 /* Check whether an extension has been sent multiple times. */ 1825 if (ssl3_ExtensionNegotiated(ss, extension_type)) 1826 return SECFailure; 1827 1828 /* find extension_type in table of Hello Extension Handlers */ 1829 for (handler = handlers; handler->ex_type >= 0; handler++) { 1830 /* if found, call this handler */ 1831 if (handler->ex_type == extension_type) { 1832 rv = (*handler->ex_handler)(ss, (PRUint16)extension_type, 1833 &extension_data); 1834 /* Ignore this result */ 1835 /* Treat all bad extensions as unrecognized types. */ 1836 break; 1837 } 1838 } 1839 } 1840 return SECSuccess; 1841 } 1842 1843 /* Add a callback function to the table of senders of server hello extensions. 1844 */ 1845 SECStatus 1846 ssl3_RegisterServerHelloExtensionSender(sslSocket *ss, PRUint16 ex_type, 1847 ssl3HelloExtensionSenderFunc cb) 1848 { 1849 int i; 1850 ssl3HelloExtensionSender *sender = &ss->xtnData.serverSenders[0]; 1851 1852 for (i = 0; i < SSL_MAX_EXTENSIONS; ++i, ++sender) { 1853 if (!sender->ex_sender) { 1854 sender->ex_type = ex_type; 1855 sender->ex_sender = cb; 1856 return SECSuccess; 1857 } 1858 /* detect duplicate senders */ 1859 PORT_Assert(sender->ex_type != ex_type); 1860 if (sender->ex_type == ex_type) { 1861 /* duplicate */ 1862 break; 1863 } 1864 } 1865 PORT_Assert(i < SSL_MAX_EXTENSIONS); /* table needs to grow */ 1866 PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); 1867 return SECFailure; 1868 } 1869 1870 /* call each of the extension senders and return the accumulated length */ 1871 PRInt32 1872 ssl3_CallHelloExtensionSenders(sslSocket *ss, PRBool append, PRUint32 maxBytes, 1873 const ssl3HelloExtensionSender *sender) 1874 { 1875 PRInt32 total_exten_len = 0; 1876 int i; 1877 1878 if (!sender) { 1879 sender = ss->version > SSL_LIBRARY_VERSION_3_0 ? 1880 &clientHelloSendersTLS[0] : &clientHelloSendersSSL3[0]; 1881 } 1882 1883 for (i = 0; i < SSL_MAX_EXTENSIONS; ++i, ++sender) { 1884 if (sender->ex_sender) { 1885 PRInt32 extLen = (*sender->ex_sender)(ss, append, maxBytes); 1886 if (extLen < 0) 1887 return -1; 1888 maxBytes -= extLen; 1889 total_exten_len += extLen; 1890 } 1891 } 1892 return total_exten_len; 1893 } 1894 1895 1896 /* Extension format: 1897 * Extension number: 2 bytes 1898 * Extension length: 2 bytes 1899 * Verify Data Length: 1 byte 1900 * Verify Data (TLS): 12 bytes (client) or 24 bytes (server) 1901 * Verify Data (SSL): 36 bytes (client) or 72 bytes (server) 1902 */ 1903 static PRInt32 1904 ssl3_SendRenegotiationInfoXtn( 1905 sslSocket * ss, 1906 PRBool append, 1907 PRUint32 maxBytes) 1908 { 1909 PRInt32 len, needed; 1910 1911 /* In draft-ietf-tls-renegotiation-03, it is NOT RECOMMENDED to send 1912 * both the SCSV and the empty RI, so when we send SCSV in 1913 * the initial handshake, we don't also send RI. 1914 */ 1915 if (!ss || ss->ssl3.hs.sendingSCSV) 1916 return 0; 1917 len = !ss->firstHsDone ? 0 : 1918 (ss->sec.isServer ? ss->ssl3.hs.finishedBytes * 2 1919 : ss->ssl3.hs.finishedBytes); 1920 needed = 5 + len; 1921 if (append && maxBytes >= needed) { 1922 SECStatus rv; 1923 /* extension_type */ 1924 rv = ssl3_AppendHandshakeNumber(ss, ssl_renegotiation_info_xtn, 2); 1925 if (rv != SECSuccess) return -1; 1926 /* length of extension_data */ 1927 rv = ssl3_AppendHandshakeNumber(ss, len + 1, 2); 1928 if (rv != SECSuccess) return -1; 1929 /* verify_Data from previous Finished message(s) */ 1930 rv = ssl3_AppendHandshakeVariable(ss, 1931 ss->ssl3.hs.finishedMsgs.data, len, 1); 1932 if (rv != SECSuccess) return -1; 1933 if (!ss->sec.isServer) { 1934 TLSExtensionData *xtnData = &ss->xtnData; 1935 xtnData->advertised[xtnData->numAdvertised++] = 1936 ssl_renegotiation_info_xtn; 1937 } 1938 } 1939 return needed; 1940 } 1941 1942 static SECStatus 1943 ssl3_ServerHandleStatusRequestXtn(sslSocket *ss, PRUint16 ex_type, 1944 SECItem *data) 1945 { 1946 SECStatus rv = SECSuccess; 1947 1948 /* remember that we got this extension. */ 1949 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 1950 PORT_Assert(ss->sec.isServer); 1951 /* prepare to send back the appropriate response */ 1952 rv = ssl3_RegisterServerHelloExtensionSender(ss, ex_type, 1953 ssl3_ServerSendStatusRequestXtn); 1954 return rv; 1955 } 1956 1957 /* This function runs in both the client and server. */ 1958 static SECStatus 1959 ssl3_HandleRenegotiationInfoXtn(sslSocket *ss, PRUint16 ex_type, SECItem *data) 1960 { 1961 SECStatus rv = SECSuccess; 1962 PRUint32 len = 0; 1963 1964 if (ss->firstHsDone) { 1965 len = ss->sec.isServer ? ss->ssl3.hs.finishedBytes 1966 : ss->ssl3.hs.finishedBytes * 2; 1967 } 1968 if (data->len != 1 + len || 1969 data->data[0] != len || (len && 1970 NSS_SecureMemcmp(ss->ssl3.hs.finishedMsgs.data, 1971 data->data + 1, len))) { 1972 /* Can we do this here? Or, must we arrange for the caller to do it? */ 1973 (void)SSL3_SendAlert(ss, alert_fatal, handshake_failure); 1974 PORT_SetError(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE); 1975 return SECFailure; 1976 } 1977 /* remember that we got this extension and it was correct. */ 1978 ss->peerRequestedProtection = 1; 1979 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 1980 if (ss->sec.isServer) { 1981 /* prepare to send back the appropriate response */ 1982 rv = ssl3_RegisterServerHelloExtensionSender(ss, ex_type, 1983 ssl3_SendRenegotiationInfoXtn); 1984 } 1985 return rv; 1986 } 1987 1988 static PRInt32 1989 ssl3_SendUseSRTPXtn(sslSocket *ss, PRBool append, PRUint32 maxBytes) 1990 { 1991 PRUint32 ext_data_len; 1992 PRInt16 i; 1993 SECStatus rv; 1994 1995 if (!ss) 1996 return 0; 1997 1998 if (!ss->sec.isServer) { 1999 /* Client side */ 2000 2001 if (!IS_DTLS(ss) || !ss->ssl3.dtlsSRTPCipherCount) 2002 return 0; /* Not relevant */ 2003 2004 ext_data_len = 2 + 2 * ss->ssl3.dtlsSRTPCipherCount + 1; 2005 2006 if (append && maxBytes >= 4 + ext_data_len) { 2007 /* Extension type */ 2008 rv = ssl3_AppendHandshakeNumber(ss, ssl_use_srtp_xtn, 2); 2009 if (rv != SECSuccess) return -1; 2010 /* Length of extension data */ 2011 rv = ssl3_AppendHandshakeNumber(ss, ext_data_len, 2); 2012 if (rv != SECSuccess) return -1; 2013 /* Length of the SRTP cipher list */ 2014 rv = ssl3_AppendHandshakeNumber(ss, 2015 2 * ss->ssl3.dtlsSRTPCipherCount, 2016 2); 2017 if (rv != SECSuccess) return -1; 2018 /* The SRTP ciphers */ 2019 for (i = 0; i < ss->ssl3.dtlsSRTPCipherCount; i++) { 2020 rv = ssl3_AppendHandshakeNumber(ss, 2021 ss->ssl3.dtlsSRTPCiphers[i], 2022 2); 2023 } 2024 /* Empty MKI value */ 2025 ssl3_AppendHandshakeVariable(ss, NULL, 0, 1); 2026 2027 ss->xtnData.advertised[ss->xtnData.numAdvertised++] = 2028 ssl_use_srtp_xtn; 2029 } 2030 2031 return 4 + ext_data_len; 2032 } 2033 2034 /* Server side */ 2035 if (append && maxBytes >= 9) { 2036 /* Extension type */ 2037 rv = ssl3_AppendHandshakeNumber(ss, ssl_use_srtp_xtn, 2); 2038 if (rv != SECSuccess) return -1; 2039 /* Length of extension data */ 2040 rv = ssl3_AppendHandshakeNumber(ss, 5, 2); 2041 if (rv != SECSuccess) return -1; 2042 /* Length of the SRTP cipher list */ 2043 rv = ssl3_AppendHandshakeNumber(ss, 2, 2); 2044 if (rv != SECSuccess) return -1; 2045 /* The selected cipher */ 2046 rv = ssl3_AppendHandshakeNumber(ss, ss->ssl3.dtlsSRTPCipherSuite, 2); 2047 if (rv != SECSuccess) return -1; 2048 /* Empty MKI value */ 2049 ssl3_AppendHandshakeVariable(ss, NULL, 0, 1); 2050 } 2051 2052 return 9; 2053 } 2054 2055 static SECStatus 2056 ssl3_HandleUseSRTPXtn(sslSocket * ss, PRUint16 ex_type, SECItem *data) 2057 { 2058 SECStatus rv; 2059 SECItem ciphers = {siBuffer, NULL, 0}; 2060 PRUint16 i; 2061 unsigned int j; 2062 PRUint16 cipher = 0; 2063 PRBool found = PR_FALSE; 2064 SECItem litem; 2065 2066 if (!ss->sec.isServer) { 2067 /* Client side */ 2068 if (!data->data || !data->len) { 2069 /* malformed */ 2070 return SECFailure; 2071 } 2072 2073 /* Get the cipher list */ 2074 rv = ssl3_ConsumeHandshakeVariable(ss, &ciphers, 2, 2075 &data->data, &data->len); 2076 if (rv != SECSuccess) { 2077 return SECFailure; 2078 } 2079 /* Now check that the number of ciphers listed is 1 (len = 2) */ 2080 if (ciphers.len != 2) { 2081 return SECFailure; 2082 } 2083 2084 /* Get the selected cipher */ 2085 cipher = (ciphers.data[0] << 8) | ciphers.data[1]; 2086 2087 /* Now check that this is one of the ciphers we offered */ 2088 for (i = 0; i < ss->ssl3.dtlsSRTPCipherCount; i++) { 2089 if (cipher == ss->ssl3.dtlsSRTPCiphers[i]) { 2090 found = PR_TRUE; 2091 break; 2092 } 2093 } 2094 2095 if (!found) { 2096 return SECFailure; 2097 } 2098 2099 /* Get the srtp_mki value */ 2100 rv = ssl3_ConsumeHandshakeVariable(ss, &litem, 1, 2101 &data->data, &data->len); 2102 if (rv != SECSuccess) { 2103 return SECFailure; 2104 } 2105 2106 /* We didn't offer an MKI, so this must be 0 length */ 2107 /* XXX RFC 5764 Section 4.1.3 says: 2108 * If the client detects a nonzero-length MKI in the server's 2109 * response that is different than the one the client offered, 2110 * then the client MUST abort the handshake and SHOULD send an 2111 * invalid_parameter alert. 2112 * 2113 * Due to a limitation of the ssl3_HandleHelloExtensions function, 2114 * returning SECFailure here won't abort the handshake. It will 2115 * merely cause the use_srtp extension to be not negotiated. We 2116 * should fix this. See NSS bug 753136. 2117 */ 2118 if (litem.len != 0) { 2119 return SECFailure; 2120 } 2121 2122 if (data->len != 0) { 2123 /* malformed */ 2124 return SECFailure; 2125 } 2126 2127 /* OK, this looks fine. */ 2128 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ssl_use_srtp_xtn; 2129 ss->ssl3.dtlsSRTPCipherSuite = cipher; 2130 return SECSuccess; 2131 } 2132 2133 /* Server side */ 2134 if (!IS_DTLS(ss) || !ss->ssl3.dtlsSRTPCipherCount) { 2135 /* Ignore the extension if we aren't doing DTLS or no DTLS-SRTP 2136 * preferences have been set. */ 2137 return SECSuccess; 2138 } 2139 2140 if (!data->data || data->len < 5) { 2141 /* malformed */ 2142 return SECFailure; 2143 } 2144 2145 /* Get the cipher list */ 2146 rv = ssl3_ConsumeHandshakeVariable(ss, &ciphers, 2, 2147 &data->data, &data->len); 2148 if (rv != SECSuccess) { 2149 return SECFailure; 2150 } 2151 /* Check that the list is even length */ 2152 if (ciphers.len % 2) { 2153 return SECFailure; 2154 } 2155 2156 /* Walk through the offered list and pick the most preferred of our 2157 * ciphers, if any */ 2158 for (i = 0; !found && i < ss->ssl3.dtlsSRTPCipherCount; i++) { 2159 for (j = 0; j + 1 < ciphers.len; j += 2) { 2160 cipher = (ciphers.data[j] << 8) | ciphers.data[j + 1]; 2161 if (cipher == ss->ssl3.dtlsSRTPCiphers[i]) { 2162 found = PR_TRUE; 2163 break; 2164 } 2165 } 2166 } 2167 2168 /* Get the srtp_mki value */ 2169 rv = ssl3_ConsumeHandshakeVariable(ss, &litem, 1, &data->data, &data->len); 2170 if (rv != SECSuccess) { 2171 return SECFailure; 2172 } 2173 2174 if (data->len != 0) { 2175 return SECFailure; /* Malformed */ 2176 } 2177 2178 /* Now figure out what to do */ 2179 if (!found) { 2180 /* No matching ciphers */ 2181 return SECSuccess; 2182 } 2183 2184 /* OK, we have a valid cipher and we've selected it */ 2185 ss->ssl3.dtlsSRTPCipherSuite = cipher; 2186 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ssl_use_srtp_xtn; 2187 2188 return ssl3_RegisterServerHelloExtensionSender(ss, ssl_use_srtp_xtn, 2189 ssl3_SendUseSRTPXtn); 2190 } 2191 2192 /* ssl3_ServerHandleSigAlgsXtn handles the signature_algorithms extension 2193 * from a client. 2194 * See https://tools.ietf.org/html/rfc5246#section-7.4.1.4.1 */ 2195 static SECStatus 2196 ssl3_ServerHandleSigAlgsXtn(sslSocket * ss, PRUint16 ex_type, SECItem *data) 2197 { 2198 SECStatus rv; 2199 SECItem algorithms; 2200 const unsigned char *b; 2201 unsigned int numAlgorithms, i; 2202 2203 /* Ignore this extension if we aren't doing TLS 1.2 or greater. */ 2204 if (ss->version < SSL_LIBRARY_VERSION_TLS_1_2) { 2205 return SECSuccess; 2206 } 2207 2208 /* Keep track of negotiated extensions. */ 2209 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 2210 2211 rv = ssl3_ConsumeHandshakeVariable(ss, &algorithms, 2, &data->data, 2212 &data->len); 2213 if (rv != SECSuccess) { 2214 return SECFailure; 2215 } 2216 /* Trailing data, empty value, or odd-length value is invalid. */ 2217 if (data->len != 0 || algorithms.len == 0 || (algorithms.len & 1) != 0) { 2218 PORT_SetError(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO); 2219 return SECFailure; 2220 } 2221 2222 numAlgorithms = algorithms.len/2; 2223 2224 /* We don't care to process excessive numbers of algorithms. */ 2225 if (numAlgorithms > 512) { 2226 numAlgorithms = 512; 2227 } 2228 2229 ss->ssl3.hs.clientSigAndHash = 2230 PORT_NewArray(SSL3SignatureAndHashAlgorithm, numAlgorithms); 2231 if (!ss->ssl3.hs.clientSigAndHash) { 2232 return SECFailure; 2233 } 2234 ss->ssl3.hs.numClientSigAndHash = 0; 2235 2236 b = algorithms.data; 2237 for (i = 0; i < numAlgorithms; i++) { 2238 unsigned char tls_hash = *(b++); 2239 unsigned char tls_sig = *(b++); 2240 SECOidTag hash = ssl3_TLSHashAlgorithmToOID(tls_hash); 2241 2242 if (hash == SEC_OID_UNKNOWN) { 2243 /* We ignore formats that we don't understand. */ 2244 continue; 2245 } 2246 /* tls_sig support will be checked later in 2247 * ssl3_PickSignatureHashAlgorithm. */ 2248 ss->ssl3.hs.clientSigAndHash[i].hashAlg = hash; 2249 ss->ssl3.hs.clientSigAndHash[i].sigAlg = tls_sig; 2250 ss->ssl3.hs.numClientSigAndHash++; 2251 } 2252 2253 if (!ss->ssl3.hs.numClientSigAndHash) { 2254 /* We didn't understand any of the client's requested signature 2255 * formats. We'll use the defaults. */ 2256 PORT_Free(ss->ssl3.hs.clientSigAndHash); 2257 ss->ssl3.hs.clientSigAndHash = NULL; 2258 } 2259 2260 return SECSuccess; 2261 } 2262 2263 /* ssl3_ClientSendSigAlgsXtn sends the signature_algorithm extension for TLS 2264 * 1.2 ClientHellos. */ 2265 static PRInt32 2266 ssl3_ClientSendSigAlgsXtn(sslSocket * ss, PRBool append, PRUint32 maxBytes) 2267 { 2268 static const unsigned char signatureAlgorithms[] = { 2269 /* This block is the contents of our signature_algorithms extension, in 2270 * wire format. See 2271 * https://tools.ietf.org/html/rfc5246#section-7.4.1.4.1 */ 2272 tls_hash_sha256, tls_sig_rsa, 2273 tls_hash_sha384, tls_sig_rsa, 2274 tls_hash_sha1, tls_sig_rsa, 2275 #ifdef NSS_ENABLE_ECC 2276 tls_hash_sha256, tls_sig_ecdsa, 2277 tls_hash_sha384, tls_sig_ecdsa, 2278 tls_hash_sha1, tls_sig_ecdsa, 2279 #endif 2280 tls_hash_sha256, tls_sig_dsa, 2281 tls_hash_sha1, tls_sig_dsa, 2282 }; 2283 PRInt32 extension_length; 2284 2285 if (ss->version < SSL_LIBRARY_VERSION_TLS_1_2) { 2286 return 0; 2287 } 2288 2289 extension_length = 2290 2 /* extension type */ + 2291 2 /* extension length */ + 2292 2 /* supported_signature_algorithms length */ + 2293 sizeof(signatureAlgorithms); 2294 2295 if (append && maxBytes >= extension_length) { 2296 SECStatus rv; 2297 rv = ssl3_AppendHandshakeNumber(ss, ssl_signature_algorithms_xtn, 2); 2298 if (rv != SECSuccess) 2299 goto loser; 2300 rv = ssl3_AppendHandshakeNumber(ss, extension_length - 4, 2); 2301 if (rv != SECSuccess) 2302 goto loser; 2303 rv = ssl3_AppendHandshakeVariable(ss, signatureAlgorithms, 2304 sizeof(signatureAlgorithms), 2); 2305 if (rv != SECSuccess) 2306 goto loser; 2307 ss->xtnData.advertised[ss->xtnData.numAdvertised++] = 2308 ssl_signature_algorithms_xtn; 2309 } else if (maxBytes < extension_length) { 2310 PORT_Assert(0); 2311 return 0; 2312 } 2313 2314 return extension_length; 2315 2316 loser: 2317 return -1; 2318 } 2319 2320 unsigned int 2321 ssl3_CalculatePaddingExtensionLength(unsigned int clientHelloLength) 2322 { 2323 unsigned int recordLength = 1 /* handshake message type */ + 2324 3 /* handshake message length */ + 2325 clientHelloLength; 2326 unsigned int extensionLength; 2327 2328 if (recordLength < 256 || recordLength >= 512) { 2329 return 0; 2330 } 2331 2332 extensionLength = 512 - recordLength; 2333 /* Extensions take at least four bytes to encode. */ 2334 if (extensionLength < 4) { 2335 extensionLength = 4; 2336 } 2337 2338 return extensionLength; 2339 } 2340 2341 /* ssl3_AppendPaddingExtension possibly adds an extension which ensures that a 2342 * ClientHello record is either < 256 bytes or is >= 512 bytes. This ensures 2343 * that we don't trigger bugs in F5 products. */ 2344 PRInt32 2345 ssl3_AppendPaddingExtension(sslSocket *ss, unsigned int extensionLen, 2346 PRUint32 maxBytes) 2347 { 2348 unsigned int paddingLen = extensionLen - 4; 2349 unsigned char padding[256]; 2350 2351 if (extensionLen == 0) { 2352 return 0; 2353 } 2354 2355 if (extensionLen < 4 || 2356 extensionLen > maxBytes || 2357 paddingLen > sizeof(padding)) { 2358 PORT_Assert(0); 2359 return -1; 2360 } 2361 2362 if (SECSuccess != ssl3_AppendHandshakeNumber(ss, ssl_padding_xtn, 2)) 2363 return -1; 2364 if (SECSuccess != ssl3_AppendHandshakeNumber(ss, paddingLen, 2)) 2365 return -1; 2366 memset(padding, 0, paddingLen); 2367 if (SECSuccess != ssl3_AppendHandshake(ss, padding, paddingLen)) 2368 return -1; 2369 2370 return extensionLen; 2371 } 2372 2373 /* ssl3_ClientSendSignedCertTimestampXtn sends the signed_certificate_timestamp 2374 * extension for TLS ClientHellos. */ 2375 static PRInt32 2376 ssl3_ClientSendSignedCertTimestampXtn(sslSocket *ss, PRBool append, 2377 PRUint32 maxBytes) 2378 { 2379 PRInt32 extension_length = 2 /* extension_type */ + 2380 2 /* length(extension_data) */; 2381 2382 /* Only send the extension if processing is enabled. */ 2383 if (!ss->opt.enableSignedCertTimestamps) 2384 return 0; 2385 2386 if (append && maxBytes >= extension_length) { 2387 SECStatus rv; 2388 /* extension_type */ 2389 rv = ssl3_AppendHandshakeNumber(ss, 2390 ssl_signed_certificate_timestamp_xtn, 2391 2); 2392 if (rv != SECSuccess) 2393 goto loser; 2394 /* zero length */ 2395 rv = ssl3_AppendHandshakeNumber(ss, 0, 2); 2396 if (rv != SECSuccess) 2397 goto loser; 2398 ss->xtnData.advertised[ss->xtnData.numAdvertised++] = 2399 ssl_signed_certificate_timestamp_xtn; 2400 } else if (maxBytes < extension_length) { 2401 PORT_Assert(0); 2402 return 0; 2403 } 2404 2405 return extension_length; 2406 loser: 2407 return -1; 2408 } 2409 2410 static SECStatus 2411 ssl3_ClientHandleSignedCertTimestampXtn(sslSocket *ss, PRUint16 ex_type, 2412 SECItem *data) 2413 { 2414 /* We do not yet know whether we'll be resuming a session or creating 2415 * a new one, so we keep a pointer to the data in the TLSExtensionData 2416 * structure. This pointer is only valid in the scope of 2417 * ssl3_HandleServerHello, and, if not resuming a session, the data is 2418 * copied once a new session structure has been set up. 2419 * All parsing is currently left to the application and we accept 2420 * everything, including empty data. 2421 */ 2422 SECItem *scts = &ss->xtnData.signedCertTimestamps; 2423 PORT_Assert(!scts->data && !scts->len); 2424 2425 if (!data->len) { 2426 /* Empty extension data: RFC 6962 mandates non-empty contents. */ 2427 return SECFailure; 2428 } 2429 *scts = *data; 2430 /* Keep track of negotiated extensions. */ 2431 ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type; 2432 return SECSuccess; 2433 } 2434
