net/socket/ssl_server_socket_nss.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/socket/ssl_server_socket_nss.h"
   6
   7 #if defined(OS_WIN)
   8 #include <winsock2.h>
   9 #endif
  10
  11 #if defined(USE_SYSTEM_SSL)
  12 #include <dlfcn.h>
  13 #endif
  14 #if defined(OS_MACOSX)
  15 #include <Security/Security.h>
  16 #endif
  17 #include <certdb.h>
  18 #include <cryptohi.h>
  19 #include <hasht.h>
  20 #include <keyhi.h>
  21 #include <nspr.h>
  22 #include <nss.h>
  23 #include <pk11pub.h>
  24 #include <secerr.h>
  25 #include <sechash.h>
  26 #include <ssl.h>
  27 #include <sslerr.h>
  28 #include <sslproto.h>
  29
  30 #include <limits>
  31
  32 #include "base/callback_helpers.h"
  33 #include "base/lazy_instance.h"
  34 #include "base/memory/ref_counted.h"
  35 #include "crypto/rsa_private_key.h"
  36 #include "crypto/nss_util_internal.h"
  37 #include "net/base/io_buffer.h"
  38 #include "net/base/net_errors.h"
  39 #include "net/base/net_log.h"
  40 #include "net/socket/nss_ssl_util.h"
  41
  42 // SSL plaintext fragments are shorter than 16KB. Although the record layer
  43 // overhead is allowed to be 2K + 5 bytes, in practice the overhead is much
  44 // smaller than 1KB. So a 17KB buffer should be large enough to hold an
  45 // entire SSL record.
  46 static const int kRecvBufferSize = 17 * 1024;
  47 static const int kSendBufferSize = 17 * 1024;
  48
  49 #define GotoState(s) next_handshake_state_ = s
  50
  51 namespace net {
  52
  53 namespace {
  54
  55 bool g_nss_server_sockets_init = false;
  56
  57 class NSSSSLServerInitSingleton {
  58  public:
  59   NSSSSLServerInitSingleton() {
  60     EnsureNSSSSLInit();
  61
  62     SSL_ConfigServerSessionIDCache(64, 28800, 28800, NULL);
  63     g_nss_server_sockets_init = true;
  64   }
  65
  66   ~NSSSSLServerInitSingleton() {
  67     SSL_ShutdownServerSessionIDCache();
  68     g_nss_server_sockets_init = false;
  69   }
  70 };
  71
  72 static base::LazyInstance<NSSSSLServerInitSingleton>
  73     g_nss_ssl_server_init_singleton = LAZY_INSTANCE_INITIALIZER;
  74
  75 }  // namespace
  76
  77 void EnableSSLServerSockets() {
  78   g_nss_ssl_server_init_singleton.Get();
  79 }
  80
  81 scoped_ptr<SSLServerSocket> CreateSSLServerSocket(
  82     scoped_ptr<StreamSocket> socket,
  83     X509Certificate* cert,
  84     crypto::RSAPrivateKey* key,
  85     const SSLConfig& ssl_config) {
  86   DCHECK(g_nss_server_sockets_init) << "EnableSSLServerSockets() has not been"
  87                                     << " called yet!";
  88
  89   return scoped_ptr<SSLServerSocket>(
  90       new SSLServerSocketNSS(socket.Pass(), cert, key, ssl_config));
  91 }
  92
  93 SSLServerSocketNSS::SSLServerSocketNSS(
  94     scoped_ptr<StreamSocket> transport_socket,
  95     scoped_refptr<X509Certificate> cert,
  96     crypto::RSAPrivateKey* key,
  97     const SSLConfig& ssl_config)
  98     : transport_send_busy_(false),
  99       transport_recv_busy_(false),
 100       user_read_buf_len_(0),
 101       user_write_buf_len_(0),
 102       nss_fd_(NULL),
 103       nss_bufs_(NULL),
 104       transport_socket_(transport_socket.Pass()),
 105       ssl_config_(ssl_config),
 106       cert_(cert),
 107       next_handshake_state_(STATE_NONE),
 108       completed_handshake_(false) {
 109   // TODO(hclam): Need a better way to clone a key.
 110   std::vector<uint8> key_bytes;
 111   CHECK(key->ExportPrivateKey(&key_bytes));
 112   key_.reset(crypto::RSAPrivateKey::CreateFromPrivateKeyInfo(key_bytes));
 113   CHECK(key_.get());
 114 }
 115
 116 SSLServerSocketNSS::~SSLServerSocketNSS() {
 117   if (nss_fd_ != NULL) {
 118     PR_Close(nss_fd_);
 119     nss_fd_ = NULL;
 120   }
 121 }
 122
 123 int SSLServerSocketNSS::Handshake(const CompletionCallback& callback) {
 124   net_log_.BeginEvent(NetLog::TYPE_SSL_SERVER_HANDSHAKE);
 125
 126   int rv = Init();
 127   if (rv != OK) {
 128     LOG(ERROR) << "Failed to initialize NSS";
 129     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_SERVER_HANDSHAKE, rv);
 130     return rv;
 131   }
 132
 133   rv = InitializeSSLOptions();
 134   if (rv != OK) {
 135     LOG(ERROR) << "Failed to initialize SSL options";
 136     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_SERVER_HANDSHAKE, rv);
 137     return rv;
 138   }
 139
 140   // Set peer address. TODO(hclam): This should be in a separate method.
 141   PRNetAddr peername;
 142   memset(&peername, 0, sizeof(peername));
 143   peername.raw.family = AF_INET;
 144   memio_SetPeerName(nss_fd_, &peername);
 145
 146   GotoState(STATE_HANDSHAKE);
 147   rv = DoHandshakeLoop(OK);
 148   if (rv == ERR_IO_PENDING) {
 149     user_handshake_callback_ = callback;
 150   } else {
 151     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_SERVER_HANDSHAKE, rv);
 152   }
 153
 154   return rv > OK ? OK : rv;
 155 }
 156
 157 int SSLServerSocketNSS::ExportKeyingMaterial(const base::StringPiece& label,
 158                                              bool has_context,
 159                                              const base::StringPiece& context,
 160                                              unsigned char* out,
 161                                              unsigned int outlen) {
 162   if (!IsConnected())
 163     return ERR_SOCKET_NOT_CONNECTED;
 164   SECStatus result = SSL_ExportKeyingMaterial(
 165       nss_fd_, label.data(), label.size(), has_context,
 166       reinterpret_cast<const unsigned char*>(context.data()),
 167       context.length(), out, outlen);
 168   if (result != SECSuccess) {
 169     LogFailedNSSFunction(net_log_, "SSL_ExportKeyingMaterial", "");
 170     return MapNSSError(PORT_GetError());
 171   }
 172   return OK;
 173 }
 174
 175 int SSLServerSocketNSS::GetTLSUniqueChannelBinding(std::string* out) {
 176   if (!IsConnected())
 177     return ERR_SOCKET_NOT_CONNECTED;
 178   unsigned char buf[64];
 179   unsigned int len;
 180   SECStatus result = SSL_GetChannelBinding(nss_fd_,
 181                                            SSL_CHANNEL_BINDING_TLS_UNIQUE,
 182                                            buf, &len, arraysize(buf));
 183   if (result != SECSuccess) {
 184     LogFailedNSSFunction(net_log_, "SSL_GetChannelBinding", "");
 185     return MapNSSError(PORT_GetError());
 186   }
 187   out->assign(reinterpret_cast<char*>(buf), len);
 188   return OK;
 189 }
 190
 191 int SSLServerSocketNSS::Connect(const CompletionCallback& callback) {
 192   NOTIMPLEMENTED();
 193   return ERR_NOT_IMPLEMENTED;
 194 }
 195
 196 int SSLServerSocketNSS::Read(IOBuffer* buf, int buf_len,
 197                              const CompletionCallback& callback) {
 198   DCHECK(user_read_callback_.is_null());
 199   DCHECK(user_handshake_callback_.is_null());
 200   DCHECK(!user_read_buf_.get());
 201   DCHECK(nss_bufs_);
 202   DCHECK(!callback.is_null());
 203
 204   user_read_buf_ = buf;
 205   user_read_buf_len_ = buf_len;
 206
 207   DCHECK(completed_handshake_);
 208
 209   int rv = DoReadLoop(OK);
 210
 211   if (rv == ERR_IO_PENDING) {
 212     user_read_callback_ = callback;
 213   } else {
 214     user_read_buf_ = NULL;
 215     user_read_buf_len_ = 0;
 216   }
 217   return rv;
 218 }
 219
 220 int SSLServerSocketNSS::Write(IOBuffer* buf, int buf_len,
 221                               const CompletionCallback& callback) {
 222   DCHECK(user_write_callback_.is_null());
 223   DCHECK(!user_write_buf_.get());
 224   DCHECK(nss_bufs_);
 225   DCHECK(!callback.is_null());
 226
 227   user_write_buf_ = buf;
 228   user_write_buf_len_ = buf_len;
 229
 230   int rv = DoWriteLoop(OK);
 231
 232   if (rv == ERR_IO_PENDING) {
 233     user_write_callback_ = callback;
 234   } else {
 235     user_write_buf_ = NULL;
 236     user_write_buf_len_ = 0;
 237   }
 238   return rv;
 239 }
 240
 241 int SSLServerSocketNSS::SetReceiveBufferSize(int32 size) {
 242   return transport_socket_->SetReceiveBufferSize(size);
 243 }
 244
 245 int SSLServerSocketNSS::SetSendBufferSize(int32 size) {
 246   return transport_socket_->SetSendBufferSize(size);
 247 }
 248
 249 bool SSLServerSocketNSS::IsConnected() const {
 250   // TODO(wtc): Find out if we should check transport_socket_->IsConnected()
 251   // as well.
 252   return completed_handshake_;
 253 }
 254
 255 void SSLServerSocketNSS::Disconnect() {
 256   transport_socket_->Disconnect();
 257 }
 258
 259 bool SSLServerSocketNSS::IsConnectedAndIdle() const {
 260   return completed_handshake_ && transport_socket_->IsConnectedAndIdle();
 261 }
 262
 263 int SSLServerSocketNSS::GetPeerAddress(IPEndPoint* address) const {
 264   if (!IsConnected())
 265     return ERR_SOCKET_NOT_CONNECTED;
 266   return transport_socket_->GetPeerAddress(address);
 267 }
 268
 269 int SSLServerSocketNSS::GetLocalAddress(IPEndPoint* address) const {
 270   if (!IsConnected())
 271     return ERR_SOCKET_NOT_CONNECTED;
 272   return transport_socket_->GetLocalAddress(address);
 273 }
 274
 275 const BoundNetLog& SSLServerSocketNSS::NetLog() const {
 276   return net_log_;
 277 }
 278
 279 void SSLServerSocketNSS::SetSubresourceSpeculation() {
 280   transport_socket_->SetSubresourceSpeculation();
 281 }
 282
 283 void SSLServerSocketNSS::SetOmniboxSpeculation() {
 284   transport_socket_->SetOmniboxSpeculation();
 285 }
 286
 287 bool SSLServerSocketNSS::WasEverUsed() const {
 288   return transport_socket_->WasEverUsed();
 289 }
 290
 291 bool SSLServerSocketNSS::UsingTCPFastOpen() const {
 292   return transport_socket_->UsingTCPFastOpen();
 293 }
 294
 295 bool SSLServerSocketNSS::WasNpnNegotiated() const {
 296   NOTIMPLEMENTED();
 297   return false;
 298 }
 299
 300 NextProto SSLServerSocketNSS::GetNegotiatedProtocol() const {
 301   // NPN is not supported by this class.
 302   return kProtoUnknown;
 303 }
 304
 305 bool SSLServerSocketNSS::GetSSLInfo(SSLInfo* ssl_info) {
 306   NOTIMPLEMENTED();
 307   return false;
 308 }
 309
 310 int SSLServerSocketNSS::InitializeSSLOptions() {
 311   // Transport connected, now hook it up to nss
 312   nss_fd_ = memio_CreateIOLayer(kRecvBufferSize, kSendBufferSize);
 313   if (nss_fd_ == NULL) {
 314     return ERR_OUT_OF_MEMORY;  // TODO(port): map NSPR error code.
 315   }
 316
 317   // Grab pointer to buffers
 318   nss_bufs_ = memio_GetSecret(nss_fd_);
 319
 320   /* Create SSL state machine */
 321   /* Push SSL onto our fake I/O socket */
 322   nss_fd_ = SSL_ImportFD(NULL, nss_fd_);
 323   if (nss_fd_ == NULL) {
 324     LogFailedNSSFunction(net_log_, "SSL_ImportFD", "");
 325     return ERR_OUT_OF_MEMORY;  // TODO(port): map NSPR/NSS error code.
 326   }
 327   // TODO(port): set more ssl options!  Check errors!
 328
 329   int rv;
 330
 331   rv = SSL_OptionSet(nss_fd_, SSL_SECURITY, PR_TRUE);
 332   if (rv != SECSuccess) {
 333     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_SECURITY");
 334     return ERR_UNEXPECTED;
 335   }
 336
 337   rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_SSL2, PR_FALSE);
 338   if (rv != SECSuccess) {
 339     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_ENABLE_SSL2");
 340     return ERR_UNEXPECTED;
 341   }
 342
 343   SSLVersionRange version_range;
 344   version_range.min = ssl_config_.version_min;
 345   version_range.max = ssl_config_.version_max;
 346   rv = SSL_VersionRangeSet(nss_fd_, &version_range);
 347   if (rv != SECSuccess) {
 348     LogFailedNSSFunction(net_log_, "SSL_VersionRangeSet", "");
 349     return ERR_NO_SSL_VERSIONS_ENABLED;
 350   }
 351
 352   if (ssl_config_.require_forward_secrecy) {
 353     const PRUint16* const ssl_ciphers = SSL_GetImplementedCiphers();
 354     const PRUint16 num_ciphers = SSL_GetNumImplementedCiphers();
 355
 356     // Require forward security by iterating over the cipher suites and
 357     // disabling all those that don't use ECDHE.
 358     for (unsigned i = 0; i < num_ciphers; i++) {
 359       SSLCipherSuiteInfo info;
 360       if (SSL_GetCipherSuiteInfo(ssl_ciphers[i], &info, sizeof(info)) ==
 361           SECSuccess) {
 362         if (strcmp(info.keaTypeName, "ECDHE") != 0) {
 363           SSL_CipherPrefSet(nss_fd_, ssl_ciphers[i], PR_FALSE);
 364         }
 365       }
 366     }
 367   }
 368
 369   for (std::vector<uint16>::const_iterator it =
 370            ssl_config_.disabled_cipher_suites.begin();
 371        it != ssl_config_.disabled_cipher_suites.end(); ++it) {
 372     // This will fail if the specified cipher is not implemented by NSS, but
 373     // the failure is harmless.
 374     SSL_CipherPrefSet(nss_fd_, *it, PR_FALSE);
 375   }
 376
 377   // Server socket doesn't need session tickets.
 378   rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_SESSION_TICKETS, PR_FALSE);
 379   if (rv != SECSuccess) {
 380     LogFailedNSSFunction(
 381         net_log_, "SSL_OptionSet", "SSL_ENABLE_SESSION_TICKETS");
 382   }
 383
 384   // Doing this will force PR_Accept perform handshake as server.
 385   rv = SSL_OptionSet(nss_fd_, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE);
 386   if (rv != SECSuccess) {
 387     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_HANDSHAKE_AS_CLIENT");
 388     return ERR_UNEXPECTED;
 389   }
 390
 391   rv = SSL_OptionSet(nss_fd_, SSL_HANDSHAKE_AS_SERVER, PR_TRUE);
 392   if (rv != SECSuccess) {
 393     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_HANDSHAKE_AS_SERVER");
 394     return ERR_UNEXPECTED;
 395   }
 396
 397   rv = SSL_OptionSet(nss_fd_, SSL_REQUEST_CERTIFICATE, PR_FALSE);
 398   if (rv != SECSuccess) {
 399     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_REQUEST_CERTIFICATE");
 400     return ERR_UNEXPECTED;
 401   }
 402
 403   rv = SSL_OptionSet(nss_fd_, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
 404   if (rv != SECSuccess) {
 405     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_REQUIRE_CERTIFICATE");
 406     return ERR_UNEXPECTED;
 407   }
 408
 409   rv = SSL_AuthCertificateHook(nss_fd_, OwnAuthCertHandler, this);
 410   if (rv != SECSuccess) {
 411     LogFailedNSSFunction(net_log_, "SSL_AuthCertificateHook", "");
 412     return ERR_UNEXPECTED;
 413   }
 414
 415   rv = SSL_HandshakeCallback(nss_fd_, HandshakeCallback, this);
 416   if (rv != SECSuccess) {
 417     LogFailedNSSFunction(net_log_, "SSL_HandshakeCallback", "");
 418     return ERR_UNEXPECTED;
 419   }
 420
 421   // Get a certificate of CERTCertificate structure.
 422   std::string der_string;
 423   if (!X509Certificate::GetDEREncoded(cert_->os_cert_handle(), &der_string))
 424     return ERR_UNEXPECTED;
 425
 426   SECItem der_cert;
 427   der_cert.data = reinterpret_cast<unsigned char*>(const_cast<char*>(
 428       der_string.data()));
 429   der_cert.len  = der_string.length();
 430   der_cert.type = siDERCertBuffer;
 431
 432   // Parse into a CERTCertificate structure.
 433   CERTCertificate* cert = CERT_NewTempCertificate(
 434       CERT_GetDefaultCertDB(), &der_cert, NULL, PR_FALSE, PR_TRUE);
 435   if (!cert) {
 436     LogFailedNSSFunction(net_log_, "CERT_NewTempCertificate", "");
 437     return MapNSSError(PORT_GetError());
 438   }
 439
 440   // Get a key of SECKEYPrivateKey* structure.
 441   std::vector<uint8> key_vector;
 442   if (!key_->ExportPrivateKey(&key_vector)) {
 443     CERT_DestroyCertificate(cert);
 444     return ERR_UNEXPECTED;
 445   }
 446
 447   SECKEYPrivateKeyStr* private_key = NULL;
 448   PK11SlotInfo* slot = PK11_GetInternalSlot();
 449   if (!slot) {
 450     CERT_DestroyCertificate(cert);
 451     return ERR_UNEXPECTED;
 452   }
 453
 454   SECItem der_private_key_info;
 455   der_private_key_info.data =
 456       const_cast<unsigned char*>(&key_vector.front());
 457   der_private_key_info.len = key_vector.size();
 458   // The server's RSA private key must be imported into NSS with the
 459   // following key usage bits:
 460   // - KU_KEY_ENCIPHERMENT, required for the RSA key exchange algorithm.
 461   // - KU_DIGITAL_SIGNATURE, required for the DHE_RSA and ECDHE_RSA key
 462   //   exchange algorithms.
 463   const unsigned int key_usage = KU_KEY_ENCIPHERMENT | KU_DIGITAL_SIGNATURE;
 464   rv =  PK11_ImportDERPrivateKeyInfoAndReturnKey(
 465       slot, &der_private_key_info, NULL, NULL, PR_FALSE, PR_FALSE,
 466       key_usage, &private_key, NULL);
 467   PK11_FreeSlot(slot);
 468   if (rv != SECSuccess) {
 469     CERT_DestroyCertificate(cert);
 470     return ERR_UNEXPECTED;
 471   }
 472
 473   // Assign server certificate and private key.
 474   SSLKEAType cert_kea = NSS_FindCertKEAType(cert);
 475   rv = SSL_ConfigSecureServer(nss_fd_, cert, private_key, cert_kea);
 476   CERT_DestroyCertificate(cert);
 477   SECKEY_DestroyPrivateKey(private_key);
 478
 479   if (rv != SECSuccess) {
 480     PRErrorCode prerr = PR_GetError();
 481     LOG(ERROR) << "Failed to config SSL server: " << prerr;
 482     LogFailedNSSFunction(net_log_, "SSL_ConfigureSecureServer", "");
 483     return ERR_UNEXPECTED;
 484   }
 485
 486   // Tell SSL we're a server; needed if not letting NSPR do socket I/O
 487   rv = SSL_ResetHandshake(nss_fd_, PR_TRUE);
 488   if (rv != SECSuccess) {
 489     LogFailedNSSFunction(net_log_, "SSL_ResetHandshake", "");
 490     return ERR_UNEXPECTED;
 491   }
 492
 493   return OK;
 494 }
 495
 496 void SSLServerSocketNSS::OnSendComplete(int result) {
 497   if (next_handshake_state_ == STATE_HANDSHAKE) {
 498     // In handshake phase.
 499     OnHandshakeIOComplete(result);
 500     return;
 501   }
 502
 503   // TODO(byungchul): This state machine is not correct. Copy the state machine
 504   // of SSLClientSocketNSS::OnSendComplete() which handles it better.
 505   if (!completed_handshake_)
 506     return;
 507
 508   if (user_write_buf_.get()) {
 509     int rv = DoWriteLoop(result);
 510     if (rv != ERR_IO_PENDING)
 511       DoWriteCallback(rv);
 512   } else {
 513     // Ensure that any queued ciphertext is flushed.
 514     DoTransportIO();
 515   }
 516 }
 517
 518 void SSLServerSocketNSS::OnRecvComplete(int result) {
 519   if (next_handshake_state_ == STATE_HANDSHAKE) {
 520     // In handshake phase.
 521     OnHandshakeIOComplete(result);
 522     return;
 523   }
 524
 525   // Network layer received some data, check if client requested to read
 526   // decrypted data.
 527   if (!user_read_buf_.get() || !completed_handshake_)
 528     return;
 529
 530   int rv = DoReadLoop(result);
 531   if (rv != ERR_IO_PENDING)
 532     DoReadCallback(rv);
 533 }
 534
 535 void SSLServerSocketNSS::OnHandshakeIOComplete(int result) {
 536   int rv = DoHandshakeLoop(result);
 537   if (rv == ERR_IO_PENDING)
 538     return;
 539
 540   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_SERVER_HANDSHAKE, rv);
 541   if (!user_handshake_callback_.is_null())
 542     DoHandshakeCallback(rv);
 543 }
 544
 545 // Return 0 for EOF,
 546 // > 0 for bytes transferred immediately,
 547 // < 0 for error (or the non-error ERR_IO_PENDING).
 548 int SSLServerSocketNSS::BufferSend(void) {
 549   if (transport_send_busy_)
 550     return ERR_IO_PENDING;
 551
 552   const char* buf1;
 553   const char* buf2;
 554   unsigned int len1, len2;
 555   if (memio_GetWriteParams(nss_bufs_, &buf1, &len1, &buf2, &len2)) {
 556     // The error code itself is ignored, so just return ERR_ABORTED.
 557     return ERR_ABORTED;
 558   }
 559   const unsigned int len = len1 + len2;
 560
 561   int rv = 0;
 562   if (len) {
 563     scoped_refptr<IOBuffer> send_buffer(new IOBuffer(len));
 564     memcpy(send_buffer->data(), buf1, len1);
 565     memcpy(send_buffer->data() + len1, buf2, len2);
 566     rv = transport_socket_->Write(
 567         send_buffer.get(),
 568         len,
 569         base::Bind(&SSLServerSocketNSS::BufferSendComplete,
 570                    base::Unretained(this)));
 571     if (rv == ERR_IO_PENDING) {
 572       transport_send_busy_ = true;
 573     } else {
 574       memio_PutWriteResult(nss_bufs_, MapErrorToNSS(rv));
 575     }
 576   }
 577
 578   return rv;
 579 }
 580
 581 void SSLServerSocketNSS::BufferSendComplete(int result) {
 582   memio_PutWriteResult(nss_bufs_, MapErrorToNSS(result));
 583   transport_send_busy_ = false;
 584   OnSendComplete(result);
 585 }
 586
 587 int SSLServerSocketNSS::BufferRecv(void) {
 588   if (transport_recv_busy_) return ERR_IO_PENDING;
 589
 590   char* buf;
 591   int nb = memio_GetReadParams(nss_bufs_, &buf);
 592   int rv;
 593   if (!nb) {
 594     // buffer too full to read into, so no I/O possible at moment
 595     rv = ERR_IO_PENDING;
 596   } else {
 597     recv_buffer_ = new IOBuffer(nb);
 598     rv = transport_socket_->Read(
 599         recv_buffer_.get(),
 600         nb,
 601         base::Bind(&SSLServerSocketNSS::BufferRecvComplete,
 602                    base::Unretained(this)));
 603     if (rv == ERR_IO_PENDING) {
 604       transport_recv_busy_ = true;
 605     } else {
 606       if (rv > 0)
 607         memcpy(buf, recv_buffer_->data(), rv);
 608       memio_PutReadResult(nss_bufs_, MapErrorToNSS(rv));
 609       recv_buffer_ = NULL;
 610     }
 611   }
 612   return rv;
 613 }
 614
 615 void SSLServerSocketNSS::BufferRecvComplete(int result) {
 616   if (result > 0) {
 617     char* buf;
 618     memio_GetReadParams(nss_bufs_, &buf);
 619     memcpy(buf, recv_buffer_->data(), result);
 620   }
 621   recv_buffer_ = NULL;
 622   memio_PutReadResult(nss_bufs_, MapErrorToNSS(result));
 623   transport_recv_busy_ = false;
 624   OnRecvComplete(result);
 625 }
 626
 627 // Do as much network I/O as possible between the buffer and the
 628 // transport socket. Return true if some I/O performed, false
 629 // otherwise (error or ERR_IO_PENDING).
 630 bool SSLServerSocketNSS::DoTransportIO() {
 631   bool network_moved = false;
 632   if (nss_bufs_ != NULL) {
 633     int rv;
 634     // Read and write as much data as we can. The loop is neccessary
 635     // because Write() may return synchronously.
 636     do {
 637       rv = BufferSend();
 638       if (rv > 0)
 639         network_moved = true;
 640     } while (rv > 0);
 641     if (BufferRecv() >= 0)
 642       network_moved = true;
 643   }
 644   return network_moved;
 645 }
 646
 647 int SSLServerSocketNSS::DoPayloadRead() {
 648   DCHECK(user_read_buf_.get());
 649   DCHECK_GT(user_read_buf_len_, 0);
 650   int rv = PR_Read(nss_fd_, user_read_buf_->data(), user_read_buf_len_);
 651   if (rv >= 0)
 652     return rv;
 653   PRErrorCode prerr = PR_GetError();
 654   if (prerr == PR_WOULD_BLOCK_ERROR) {
 655     return ERR_IO_PENDING;
 656   }
 657   rv = MapNSSError(prerr);
 658   net_log_.AddEvent(NetLog::TYPE_SSL_READ_ERROR,
 659                     CreateNetLogSSLErrorCallback(rv, prerr));
 660   return rv;
 661 }
 662
 663 int SSLServerSocketNSS::DoPayloadWrite() {
 664   DCHECK(user_write_buf_.get());
 665   int rv = PR_Write(nss_fd_, user_write_buf_->data(), user_write_buf_len_);
 666   if (rv >= 0)
 667     return rv;
 668   PRErrorCode prerr = PR_GetError();
 669   if (prerr == PR_WOULD_BLOCK_ERROR) {
 670     return ERR_IO_PENDING;
 671   }
 672   rv = MapNSSError(prerr);
 673   net_log_.AddEvent(NetLog::TYPE_SSL_WRITE_ERROR,
 674                     CreateNetLogSSLErrorCallback(rv, prerr));
 675   return rv;
 676 }
 677
 678 int SSLServerSocketNSS::DoHandshakeLoop(int last_io_result) {
 679   int rv = last_io_result;
 680   do {
 681     // Default to STATE_NONE for next state.
 682     // (This is a quirk carried over from the windows
 683     // implementation.  It makes reading the logs a bit harder.)
 684     // State handlers can and often do call GotoState just
 685     // to stay in the current state.
 686     State state = next_handshake_state_;
 687     GotoState(STATE_NONE);
 688     switch (state) {
 689       case STATE_HANDSHAKE:
 690         rv = DoHandshake();
 691         break;
 692       case STATE_NONE:
 693       default:
 694         rv = ERR_UNEXPECTED;
 695         LOG(DFATAL) << "unexpected state " << state;
 696         break;
 697     }
 698
 699     // Do the actual network I/O
 700     bool network_moved = DoTransportIO();
 701     if (network_moved && next_handshake_state_ == STATE_HANDSHAKE) {
 702       // In general we exit the loop if rv is ERR_IO_PENDING.  In this
 703       // special case we keep looping even if rv is ERR_IO_PENDING because
 704       // the transport IO may allow DoHandshake to make progress.
 705       rv = OK;  // This causes us to stay in the loop.
 706     }
 707   } while (rv != ERR_IO_PENDING && next_handshake_state_ != STATE_NONE);
 708   return rv;
 709 }
 710
 711 int SSLServerSocketNSS::DoReadLoop(int result) {
 712   DCHECK(completed_handshake_);
 713   DCHECK(next_handshake_state_ == STATE_NONE);
 714
 715   if (result < 0)
 716     return result;
 717
 718   if (!nss_bufs_) {
 719     LOG(DFATAL) << "!nss_bufs_";
 720     int rv = ERR_UNEXPECTED;
 721     net_log_.AddEvent(NetLog::TYPE_SSL_READ_ERROR,
 722                       CreateNetLogSSLErrorCallback(rv, 0));
 723     return rv;
 724   }
 725
 726   bool network_moved;
 727   int rv;
 728   do {
 729     rv = DoPayloadRead();
 730     network_moved = DoTransportIO();
 731   } while (rv == ERR_IO_PENDING && network_moved);
 732   return rv;
 733 }
 734
 735 int SSLServerSocketNSS::DoWriteLoop(int result) {
 736   DCHECK(completed_handshake_);
 737   DCHECK_EQ(next_handshake_state_, STATE_NONE);
 738
 739   if (result < 0)
 740     return result;
 741
 742   if (!nss_bufs_) {
 743     LOG(DFATAL) << "!nss_bufs_";
 744     int rv = ERR_UNEXPECTED;
 745     net_log_.AddEvent(NetLog::TYPE_SSL_WRITE_ERROR,
 746                       CreateNetLogSSLErrorCallback(rv, 0));
 747     return rv;
 748   }
 749
 750   bool network_moved;
 751   int rv;
 752   do {
 753     rv = DoPayloadWrite();
 754     network_moved = DoTransportIO();
 755   } while (rv == ERR_IO_PENDING && network_moved);
 756   return rv;
 757 }
 758
 759 int SSLServerSocketNSS::DoHandshake() {
 760   int net_error = OK;
 761   SECStatus rv = SSL_ForceHandshake(nss_fd_);
 762
 763   if (rv == SECSuccess) {
 764     completed_handshake_ = true;
 765   } else {
 766     PRErrorCode prerr = PR_GetError();
 767     net_error = MapNSSError(prerr);
 768
 769     // If not done, stay in this state
 770     if (net_error == ERR_IO_PENDING) {
 771       GotoState(STATE_HANDSHAKE);
 772     } else {
 773       LOG(ERROR) << "handshake failed; NSS error code " << prerr
 774                  << ", net_error " << net_error;
 775       net_log_.AddEvent(NetLog::TYPE_SSL_HANDSHAKE_ERROR,
 776                         CreateNetLogSSLErrorCallback(net_error, prerr));
 777     }
 778   }
 779   return net_error;
 780 }
 781
 782 void SSLServerSocketNSS::DoHandshakeCallback(int rv) {
 783   DCHECK_NE(rv, ERR_IO_PENDING);
 784   ResetAndReturn(&user_handshake_callback_).Run(rv > OK ? OK : rv);
 785 }
 786
 787 void SSLServerSocketNSS::DoReadCallback(int rv) {
 788   DCHECK(rv != ERR_IO_PENDING);
 789   DCHECK(!user_read_callback_.is_null());
 790
 791   user_read_buf_ = NULL;
 792   user_read_buf_len_ = 0;
 793   ResetAndReturn(&user_read_callback_).Run(rv);
 794 }
 795
 796 void SSLServerSocketNSS::DoWriteCallback(int rv) {
 797   DCHECK(rv != ERR_IO_PENDING);
 798   DCHECK(!user_write_callback_.is_null());
 799
 800   user_write_buf_ = NULL;
 801   user_write_buf_len_ = 0;
 802   ResetAndReturn(&user_write_callback_).Run(rv);
 803 }
 804
 805 // static
 806 // NSS calls this if an incoming certificate needs to be verified.
 807 // Do nothing but return SECSuccess.
 808 // This is called only in full handshake mode.
 809 // Peer certificate is retrieved in HandshakeCallback() later, which is called
 810 // in full handshake mode or in resumption handshake mode.
 811 SECStatus SSLServerSocketNSS::OwnAuthCertHandler(void* arg,
 812                                                  PRFileDesc* socket,
 813                                                  PRBool checksig,
 814                                                  PRBool is_server) {
 815   // TODO(hclam): Implement.
 816   // Tell NSS to not verify the certificate.
 817   return SECSuccess;
 818 }
 819
 820 // static
 821 // NSS calls this when handshake is completed.
 822 // After the SSL handshake is finished we need to verify the certificate.
 823 void SSLServerSocketNSS::HandshakeCallback(PRFileDesc* socket,
 824                                            void* arg) {
 825   // TODO(hclam): Implement.
 826 }
 827
 828 int SSLServerSocketNSS::Init() {
 829   // Initialize the NSS SSL library in a threadsafe way.  This also
 830   // initializes the NSS base library.
 831   EnsureNSSSSLInit();
 832   if (!NSS_IsInitialized())
 833     return ERR_UNEXPECTED;
 834
 835   EnableSSLServerSockets();
 836   return OK;
 837 }
 838
 839 }  // namespace net