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/lazy_instance.h"
  33 #include "base/memory/ref_counted.h"
  34 #include "crypto/rsa_private_key.h"
  35 #include "crypto/nss_util_internal.h"
  36 #include "net/base/io_buffer.h"
  37 #include "net/base/net_errors.h"
  38 #include "net/base/net_log.h"
  39 #include "net/socket/nss_ssl_util.h"
  40 #include "net/socket/ssl_error_params.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(1024, 5, 5, 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   return completed_handshake_;
 251 }
 252
 253 void SSLServerSocketNSS::Disconnect() {
 254   transport_socket_->Disconnect();
 255 }
 256
 257 bool SSLServerSocketNSS::IsConnectedAndIdle() const {
 258   return completed_handshake_ && transport_socket_->IsConnectedAndIdle();
 259 }
 260
 261 int SSLServerSocketNSS::GetPeerAddress(IPEndPoint* address) const {
 262   if (!IsConnected())
 263     return ERR_SOCKET_NOT_CONNECTED;
 264   return transport_socket_->GetPeerAddress(address);
 265 }
 266
 267 int SSLServerSocketNSS::GetLocalAddress(IPEndPoint* address) const {
 268   if (!IsConnected())
 269     return ERR_SOCKET_NOT_CONNECTED;
 270   return transport_socket_->GetLocalAddress(address);
 271 }
 272
 273 const BoundNetLog& SSLServerSocketNSS::NetLog() const {
 274   return net_log_;
 275 }
 276
 277 void SSLServerSocketNSS::SetSubresourceSpeculation() {
 278   transport_socket_->SetSubresourceSpeculation();
 279 }
 280
 281 void SSLServerSocketNSS::SetOmniboxSpeculation() {
 282   transport_socket_->SetOmniboxSpeculation();
 283 }
 284
 285 bool SSLServerSocketNSS::WasEverUsed() const {
 286   return transport_socket_->WasEverUsed();
 287 }
 288
 289 bool SSLServerSocketNSS::UsingTCPFastOpen() const {
 290   return transport_socket_->UsingTCPFastOpen();
 291 }
 292
 293 bool SSLServerSocketNSS::WasNpnNegotiated() const {
 294   return false;
 295 }
 296
 297 NextProto SSLServerSocketNSS::GetNegotiatedProtocol() const {
 298   // NPN is not supported by this class.
 299   return kProtoUnknown;
 300 }
 301
 302 bool SSLServerSocketNSS::GetSSLInfo(SSLInfo* ssl_info) {
 303   NOTIMPLEMENTED();
 304   return false;
 305 }
 306
 307 int SSLServerSocketNSS::InitializeSSLOptions() {
 308   // Transport connected, now hook it up to nss
 309   nss_fd_ = memio_CreateIOLayer(kRecvBufferSize, kSendBufferSize);
 310   if (nss_fd_ == NULL) {
 311     return ERR_OUT_OF_MEMORY;  // TODO(port): map NSPR error code.
 312   }
 313
 314   // Grab pointer to buffers
 315   nss_bufs_ = memio_GetSecret(nss_fd_);
 316
 317   /* Create SSL state machine */
 318   /* Push SSL onto our fake I/O socket */
 319   nss_fd_ = SSL_ImportFD(NULL, nss_fd_);
 320   if (nss_fd_ == NULL) {
 321     LogFailedNSSFunction(net_log_, "SSL_ImportFD", "");
 322     return ERR_OUT_OF_MEMORY;  // TODO(port): map NSPR/NSS error code.
 323   }
 324   // TODO(port): set more ssl options!  Check errors!
 325
 326   int rv;
 327
 328   rv = SSL_OptionSet(nss_fd_, SSL_SECURITY, PR_TRUE);
 329   if (rv != SECSuccess) {
 330     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_SECURITY");
 331     return ERR_UNEXPECTED;
 332   }
 333
 334   rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_SSL2, PR_FALSE);
 335   if (rv != SECSuccess) {
 336     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_ENABLE_SSL2");
 337     return ERR_UNEXPECTED;
 338   }
 339
 340   SSLVersionRange version_range;
 341   version_range.min = ssl_config_.version_min;
 342   version_range.max = ssl_config_.version_max;
 343   rv = SSL_VersionRangeSet(nss_fd_, &version_range);
 344   if (rv != SECSuccess) {
 345     LogFailedNSSFunction(net_log_, "SSL_VersionRangeSet", "");
 346     return ERR_NO_SSL_VERSIONS_ENABLED;
 347   }
 348
 349   if (ssl_config_.require_forward_secrecy) {
 350     const PRUint16* const ssl_ciphers = SSL_GetImplementedCiphers();
 351     const PRUint16 num_ciphers = SSL_GetNumImplementedCiphers();
 352
 353     // Require forward security by iterating over the cipher suites and
 354     // disabling all those that don't use ECDHE.
 355     for (unsigned i = 0; i < num_ciphers; i++) {
 356       SSLCipherSuiteInfo info;
 357       if (SSL_GetCipherSuiteInfo(ssl_ciphers[i], &info, sizeof(info)) ==
 358           SECSuccess) {
 359         if (strcmp(info.keaTypeName, "ECDHE") != 0) {
 360           SSL_CipherPrefSet(nss_fd_, ssl_ciphers[i], PR_FALSE);
 361         }
 362       }
 363     }
 364   }
 365
 366   for (std::vector<uint16>::const_iterator it =
 367            ssl_config_.disabled_cipher_suites.begin();
 368        it != ssl_config_.disabled_cipher_suites.end(); ++it) {
 369     // This will fail if the specified cipher is not implemented by NSS, but
 370     // the failure is harmless.
 371     SSL_CipherPrefSet(nss_fd_, *it, PR_FALSE);
 372   }
 373
 374   // Server socket doesn't need session tickets.
 375   rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_SESSION_TICKETS, PR_FALSE);
 376   if (rv != SECSuccess) {
 377     LogFailedNSSFunction(
 378         net_log_, "SSL_OptionSet", "SSL_ENABLE_SESSION_TICKETS");
 379   }
 380
 381   // Doing this will force PR_Accept perform handshake as server.
 382   rv = SSL_OptionSet(nss_fd_, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE);
 383   if (rv != SECSuccess) {
 384     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_HANDSHAKE_AS_CLIENT");
 385     return ERR_UNEXPECTED;
 386   }
 387
 388   rv = SSL_OptionSet(nss_fd_, SSL_HANDSHAKE_AS_SERVER, PR_TRUE);
 389   if (rv != SECSuccess) {
 390     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_HANDSHAKE_AS_SERVER");
 391     return ERR_UNEXPECTED;
 392   }
 393
 394   rv = SSL_OptionSet(nss_fd_, SSL_REQUEST_CERTIFICATE, PR_FALSE);
 395   if (rv != SECSuccess) {
 396     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_REQUEST_CERTIFICATE");
 397     return ERR_UNEXPECTED;
 398   }
 399
 400   rv = SSL_OptionSet(nss_fd_, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
 401   if (rv != SECSuccess) {
 402     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_REQUIRE_CERTIFICATE");
 403     return ERR_UNEXPECTED;
 404   }
 405
 406   rv = SSL_AuthCertificateHook(nss_fd_, OwnAuthCertHandler, this);
 407   if (rv != SECSuccess) {
 408     LogFailedNSSFunction(net_log_, "SSL_AuthCertificateHook", "");
 409     return ERR_UNEXPECTED;
 410   }
 411
 412   rv = SSL_HandshakeCallback(nss_fd_, HandshakeCallback, this);
 413   if (rv != SECSuccess) {
 414     LogFailedNSSFunction(net_log_, "SSL_HandshakeCallback", "");
 415     return ERR_UNEXPECTED;
 416   }
 417
 418   // Get a certificate of CERTCertificate structure.
 419   std::string der_string;
 420   if (!X509Certificate::GetDEREncoded(cert_->os_cert_handle(), &der_string))
 421     return ERR_UNEXPECTED;
 422
 423   SECItem der_cert;
 424   der_cert.data = reinterpret_cast<unsigned char*>(const_cast<char*>(
 425       der_string.data()));
 426   der_cert.len  = der_string.length();
 427   der_cert.type = siDERCertBuffer;
 428
 429   // Parse into a CERTCertificate structure.
 430   CERTCertificate* cert = CERT_NewTempCertificate(
 431       CERT_GetDefaultCertDB(), &der_cert, NULL, PR_FALSE, PR_TRUE);
 432   if (!cert) {
 433     LogFailedNSSFunction(net_log_, "CERT_NewTempCertificate", "");
 434     return MapNSSError(PORT_GetError());
 435   }
 436
 437   // Get a key of SECKEYPrivateKey* structure.
 438   std::vector<uint8> key_vector;
 439   if (!key_->ExportPrivateKey(&key_vector)) {
 440     CERT_DestroyCertificate(cert);
 441     return ERR_UNEXPECTED;
 442   }
 443
 444   SECKEYPrivateKeyStr* private_key = NULL;
 445   PK11SlotInfo* slot = crypto::GetPrivateNSSKeySlot();
 446   if (!slot) {
 447     CERT_DestroyCertificate(cert);
 448     return ERR_UNEXPECTED;
 449   }
 450
 451   SECItem der_private_key_info;
 452   der_private_key_info.data =
 453       const_cast<unsigned char*>(&key_vector.front());
 454   der_private_key_info.len = key_vector.size();
 455   // The server's RSA private key must be imported into NSS with the
 456   // following key usage bits:
 457   // - KU_KEY_ENCIPHERMENT, required for the RSA key exchange algorithm.
 458   // - KU_DIGITAL_SIGNATURE, required for the DHE_RSA and ECDHE_RSA key
 459   //   exchange algorithms.
 460   const unsigned int key_usage = KU_KEY_ENCIPHERMENT | KU_DIGITAL_SIGNATURE;
 461   rv =  PK11_ImportDERPrivateKeyInfoAndReturnKey(
 462       slot, &der_private_key_info, NULL, NULL, PR_FALSE, PR_FALSE,
 463       key_usage, &private_key, NULL);
 464   PK11_FreeSlot(slot);
 465   if (rv != SECSuccess) {
 466     CERT_DestroyCertificate(cert);
 467     return ERR_UNEXPECTED;
 468   }
 469
 470   // Assign server certificate and private key.
 471   SSLKEAType cert_kea = NSS_FindCertKEAType(cert);
 472   rv = SSL_ConfigSecureServer(nss_fd_, cert, private_key, cert_kea);
 473   CERT_DestroyCertificate(cert);
 474   SECKEY_DestroyPrivateKey(private_key);
 475
 476   if (rv != SECSuccess) {
 477     PRErrorCode prerr = PR_GetError();
 478     LOG(ERROR) << "Failed to config SSL server: " << prerr;
 479     LogFailedNSSFunction(net_log_, "SSL_ConfigureSecureServer", "");
 480     return ERR_UNEXPECTED;
 481   }
 482
 483   // Tell SSL we're a server; needed if not letting NSPR do socket I/O
 484   rv = SSL_ResetHandshake(nss_fd_, PR_TRUE);
 485   if (rv != SECSuccess) {
 486     LogFailedNSSFunction(net_log_, "SSL_ResetHandshake", "");
 487     return ERR_UNEXPECTED;
 488   }
 489
 490   return OK;
 491 }
 492
 493 void SSLServerSocketNSS::OnSendComplete(int result) {
 494   if (next_handshake_state_ == STATE_HANDSHAKE) {
 495     // In handshake phase.
 496     OnHandshakeIOComplete(result);
 497     return;
 498   }
 499
 500   if (!completed_handshake_)
 501     return;
 502
 503   if (user_write_buf_.get()) {
 504     int rv = DoWriteLoop(result);
 505     if (rv != ERR_IO_PENDING)
 506       DoWriteCallback(rv);
 507   } else {
 508     // Ensure that any queued ciphertext is flushed.
 509     DoTransportIO();
 510   }
 511 }
 512
 513 void SSLServerSocketNSS::OnRecvComplete(int result) {
 514   if (next_handshake_state_ == STATE_HANDSHAKE) {
 515     // In handshake phase.
 516     OnHandshakeIOComplete(result);
 517     return;
 518   }
 519
 520   // Network layer received some data, check if client requested to read
 521   // decrypted data.
 522   if (!user_read_buf_.get() || !completed_handshake_)
 523     return;
 524
 525   int rv = DoReadLoop(result);
 526   if (rv != ERR_IO_PENDING)
 527     DoReadCallback(rv);
 528 }
 529
 530 void SSLServerSocketNSS::OnHandshakeIOComplete(int result) {
 531   int rv = DoHandshakeLoop(result);
 532   if (rv != ERR_IO_PENDING) {
 533     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_SERVER_HANDSHAKE, rv);
 534     if (!user_handshake_callback_.is_null())
 535       DoHandshakeCallback(rv);
 536   }
 537 }
 538
 539 // Return 0 for EOF,
 540 // > 0 for bytes transferred immediately,
 541 // < 0 for error (or the non-error ERR_IO_PENDING).
 542 int SSLServerSocketNSS::BufferSend(void) {
 543   if (transport_send_busy_)
 544     return ERR_IO_PENDING;
 545
 546   const char* buf1;
 547   const char* buf2;
 548   unsigned int len1, len2;
 549   memio_GetWriteParams(nss_bufs_, &buf1, &len1, &buf2, &len2);
 550   const unsigned int len = len1 + len2;
 551
 552   int rv = 0;
 553   if (len) {
 554     scoped_refptr<IOBuffer> send_buffer(new IOBuffer(len));
 555     memcpy(send_buffer->data(), buf1, len1);
 556     memcpy(send_buffer->data() + len1, buf2, len2);
 557     rv = transport_socket_->Write(
 558         send_buffer.get(),
 559         len,
 560         base::Bind(&SSLServerSocketNSS::BufferSendComplete,
 561                    base::Unretained(this)));
 562     if (rv == ERR_IO_PENDING) {
 563       transport_send_busy_ = true;
 564     } else {
 565       memio_PutWriteResult(nss_bufs_, MapErrorToNSS(rv));
 566     }
 567   }
 568
 569   return rv;
 570 }
 571
 572 void SSLServerSocketNSS::BufferSendComplete(int result) {
 573   memio_PutWriteResult(nss_bufs_, MapErrorToNSS(result));
 574   transport_send_busy_ = false;
 575   OnSendComplete(result);
 576 }
 577
 578 int SSLServerSocketNSS::BufferRecv(void) {
 579   if (transport_recv_busy_) return ERR_IO_PENDING;
 580
 581   char* buf;
 582   int nb = memio_GetReadParams(nss_bufs_, &buf);
 583   int rv;
 584   if (!nb) {
 585     // buffer too full to read into, so no I/O possible at moment
 586     rv = ERR_IO_PENDING;
 587   } else {
 588     recv_buffer_ = new IOBuffer(nb);
 589     rv = transport_socket_->Read(
 590         recv_buffer_.get(),
 591         nb,
 592         base::Bind(&SSLServerSocketNSS::BufferRecvComplete,
 593                    base::Unretained(this)));
 594     if (rv == ERR_IO_PENDING) {
 595       transport_recv_busy_ = true;
 596     } else {
 597       if (rv > 0)
 598         memcpy(buf, recv_buffer_->data(), rv);
 599       memio_PutReadResult(nss_bufs_, MapErrorToNSS(rv));
 600       recv_buffer_ = NULL;
 601     }
 602   }
 603   return rv;
 604 }
 605
 606 void SSLServerSocketNSS::BufferRecvComplete(int result) {
 607   if (result > 0) {
 608     char* buf;
 609     memio_GetReadParams(nss_bufs_, &buf);
 610     memcpy(buf, recv_buffer_->data(), result);
 611   }
 612   recv_buffer_ = NULL;
 613   memio_PutReadResult(nss_bufs_, MapErrorToNSS(result));
 614   transport_recv_busy_ = false;
 615   OnRecvComplete(result);
 616 }
 617
 618 // Do as much network I/O as possible between the buffer and the
 619 // transport socket. Return true if some I/O performed, false
 620 // otherwise (error or ERR_IO_PENDING).
 621 bool SSLServerSocketNSS::DoTransportIO() {
 622   bool network_moved = false;
 623   if (nss_bufs_ != NULL) {
 624     int rv;
 625     // Read and write as much data as we can. The loop is neccessary
 626     // because Write() may return synchronously.
 627     do {
 628       rv = BufferSend();
 629       if (rv > 0)
 630         network_moved = true;
 631     } while (rv > 0);
 632     if (BufferRecv() >= 0)
 633       network_moved = true;
 634   }
 635   return network_moved;
 636 }
 637
 638 int SSLServerSocketNSS::DoPayloadRead() {
 639   DCHECK(user_read_buf_.get());
 640   DCHECK_GT(user_read_buf_len_, 0);
 641   int rv = PR_Read(nss_fd_, user_read_buf_->data(), user_read_buf_len_);
 642   if (rv >= 0)
 643     return rv;
 644   PRErrorCode prerr = PR_GetError();
 645   if (prerr == PR_WOULD_BLOCK_ERROR) {
 646     return ERR_IO_PENDING;
 647   }
 648   rv = MapNSSError(prerr);
 649   net_log_.AddEvent(NetLog::TYPE_SSL_READ_ERROR,
 650                     CreateNetLogSSLErrorCallback(rv, prerr));
 651   return rv;
 652 }
 653
 654 int SSLServerSocketNSS::DoPayloadWrite() {
 655   DCHECK(user_write_buf_.get());
 656   int rv = PR_Write(nss_fd_, user_write_buf_->data(), user_write_buf_len_);
 657   if (rv >= 0)
 658     return rv;
 659   PRErrorCode prerr = PR_GetError();
 660   if (prerr == PR_WOULD_BLOCK_ERROR) {
 661     return ERR_IO_PENDING;
 662   }
 663   rv = MapNSSError(prerr);
 664   net_log_.AddEvent(NetLog::TYPE_SSL_WRITE_ERROR,
 665                     CreateNetLogSSLErrorCallback(rv, prerr));
 666   return rv;
 667 }
 668
 669 int SSLServerSocketNSS::DoHandshakeLoop(int last_io_result) {
 670   int rv = last_io_result;
 671   do {
 672     // Default to STATE_NONE for next state.
 673     // (This is a quirk carried over from the windows
 674     // implementation.  It makes reading the logs a bit harder.)
 675     // State handlers can and often do call GotoState just
 676     // to stay in the current state.
 677     State state = next_handshake_state_;
 678     GotoState(STATE_NONE);
 679     switch (state) {
 680       case STATE_HANDSHAKE:
 681         rv = DoHandshake();
 682         break;
 683       case STATE_NONE:
 684       default:
 685         rv = ERR_UNEXPECTED;
 686         LOG(DFATAL) << "unexpected state " << state;
 687         break;
 688     }
 689
 690     // Do the actual network I/O
 691     bool network_moved = DoTransportIO();
 692     if (network_moved && next_handshake_state_ == STATE_HANDSHAKE) {
 693       // In general we exit the loop if rv is ERR_IO_PENDING.  In this
 694       // special case we keep looping even if rv is ERR_IO_PENDING because
 695       // the transport IO may allow DoHandshake to make progress.
 696       rv = OK;  // This causes us to stay in the loop.
 697     }
 698   } while (rv != ERR_IO_PENDING && next_handshake_state_ != STATE_NONE);
 699   return rv;
 700 }
 701
 702 int SSLServerSocketNSS::DoReadLoop(int result) {
 703   DCHECK(completed_handshake_);
 704   DCHECK(next_handshake_state_ == STATE_NONE);
 705
 706   if (result < 0)
 707     return result;
 708
 709   if (!nss_bufs_) {
 710     LOG(DFATAL) << "!nss_bufs_";
 711     int rv = ERR_UNEXPECTED;
 712     net_log_.AddEvent(NetLog::TYPE_SSL_READ_ERROR,
 713                       CreateNetLogSSLErrorCallback(rv, 0));
 714     return rv;
 715   }
 716
 717   bool network_moved;
 718   int rv;
 719   do {
 720     rv = DoPayloadRead();
 721     network_moved = DoTransportIO();
 722   } while (rv == ERR_IO_PENDING && network_moved);
 723   return rv;
 724 }
 725
 726 int SSLServerSocketNSS::DoWriteLoop(int result) {
 727   DCHECK(completed_handshake_);
 728   DCHECK(next_handshake_state_ == STATE_NONE);
 729
 730   if (result < 0)
 731     return result;
 732
 733   if (!nss_bufs_) {
 734     LOG(DFATAL) << "!nss_bufs_";
 735     int rv = ERR_UNEXPECTED;
 736     net_log_.AddEvent(NetLog::TYPE_SSL_WRITE_ERROR,
 737                       CreateNetLogSSLErrorCallback(rv, 0));
 738     return rv;
 739   }
 740
 741   bool network_moved;
 742   int rv;
 743   do {
 744     rv = DoPayloadWrite();
 745     network_moved = DoTransportIO();
 746   } while (rv == ERR_IO_PENDING && network_moved);
 747   return rv;
 748 }
 749
 750 int SSLServerSocketNSS::DoHandshake() {
 751   int net_error = OK;
 752   SECStatus rv = SSL_ForceHandshake(nss_fd_);
 753
 754   if (rv == SECSuccess) {
 755     completed_handshake_ = true;
 756   } else {
 757     PRErrorCode prerr = PR_GetError();
 758     net_error = MapNSSError(prerr);
 759
 760     // If not done, stay in this state
 761     if (net_error == ERR_IO_PENDING) {
 762       GotoState(STATE_HANDSHAKE);
 763     } else {
 764       LOG(ERROR) << "handshake failed; NSS error code " << prerr
 765                  << ", net_error " << net_error;
 766       net_log_.AddEvent(NetLog::TYPE_SSL_HANDSHAKE_ERROR,
 767                         CreateNetLogSSLErrorCallback(net_error, prerr));
 768     }
 769   }
 770   return net_error;
 771 }
 772
 773 void SSLServerSocketNSS::DoHandshakeCallback(int rv) {
 774   DCHECK_NE(rv, ERR_IO_PENDING);
 775
 776   CompletionCallback c = user_handshake_callback_;
 777   user_handshake_callback_.Reset();
 778   c.Run(rv > OK ? OK : rv);
 779 }
 780
 781 void SSLServerSocketNSS::DoReadCallback(int rv) {
 782   DCHECK(rv != ERR_IO_PENDING);
 783   DCHECK(!user_read_callback_.is_null());
 784
 785   // Since Run may result in Read being called, clear |user_read_callback_|
 786   // up front.
 787   CompletionCallback c = user_read_callback_;
 788   user_read_callback_.Reset();
 789   user_read_buf_ = NULL;
 790   user_read_buf_len_ = 0;
 791   c.Run(rv);
 792 }
 793
 794 void SSLServerSocketNSS::DoWriteCallback(int rv) {
 795   DCHECK(rv != ERR_IO_PENDING);
 796   DCHECK(!user_write_callback_.is_null());
 797
 798   // Since Run may result in Write being called, clear |user_write_callback_|
 799   // up front.
 800   CompletionCallback c = user_write_callback_;
 801   user_write_callback_.Reset();
 802   user_write_buf_ = NULL;
 803   user_write_buf_len_ = 0;
 804   c.Run(rv);
 805 }
 806
 807 // static
 808 // NSS calls this if an incoming certificate needs to be verified.
 809 // Do nothing but return SECSuccess.
 810 // This is called only in full handshake mode.
 811 // Peer certificate is retrieved in HandshakeCallback() later, which is called
 812 // in full handshake mode or in resumption handshake mode.
 813 SECStatus SSLServerSocketNSS::OwnAuthCertHandler(void* arg,
 814                                                  PRFileDesc* socket,
 815                                                  PRBool checksig,
 816                                                  PRBool is_server) {
 817   // TODO(hclam): Implement.
 818   // Tell NSS to not verify the certificate.
 819   return SECSuccess;
 820 }
 821
 822 // static
 823 // NSS calls this when handshake is completed.
 824 // After the SSL handshake is finished we need to verify the certificate.
 825 void SSLServerSocketNSS::HandshakeCallback(PRFileDesc* socket,
 826                                            void* arg) {
 827   // TODO(hclam): Implement.
 828 }
 829
 830 int SSLServerSocketNSS::Init() {
 831   // Initialize the NSS SSL library in a threadsafe way.  This also
 832   // initializes the NSS base library.
 833   EnsureNSSSSLInit();
 834   if (!NSS_IsInitialized())
 835     return ERR_UNEXPECTED;
 836
 837   EnableSSLServerSockets();
 838   return OK;
 839 }
 840
 841 }  // namespace net