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/nss_util_internal.h"
  36 #include "crypto/rsa_private_key.h"
  37 #include "net/base/io_buffer.h"
  38 #include "net/base/net_errors.h"
  39 #include "net/log/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 void SSLServerSocketNSS::GetConnectionAttempts(ConnectionAttempts* out) const {
 311   out->clear();
 312 }
 313
 314 int SSLServerSocketNSS::InitializeSSLOptions() {
 315   // Transport connected, now hook it up to nss
 316   nss_fd_ = memio_CreateIOLayer(kRecvBufferSize, kSendBufferSize);
 317   if (nss_fd_ == NULL) {
 318     return ERR_OUT_OF_MEMORY;  // TODO(port): map NSPR error code.
 319   }
 320
 321   // Grab pointer to buffers
 322   nss_bufs_ = memio_GetSecret(nss_fd_);
 323
 324   /* Create SSL state machine */
 325   /* Push SSL onto our fake I/O socket */
 326   nss_fd_ = SSL_ImportFD(NULL, nss_fd_);
 327   if (nss_fd_ == NULL) {
 328     LogFailedNSSFunction(net_log_, "SSL_ImportFD", "");
 329     return ERR_OUT_OF_MEMORY;  // TODO(port): map NSPR/NSS error code.
 330   }
 331   // TODO(port): set more ssl options!  Check errors!
 332
 333   int rv;
 334
 335   rv = SSL_OptionSet(nss_fd_, SSL_SECURITY, PR_TRUE);
 336   if (rv != SECSuccess) {
 337     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_SECURITY");
 338     return ERR_UNEXPECTED;
 339   }
 340
 341   rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_SSL2, PR_FALSE);
 342   if (rv != SECSuccess) {
 343     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_ENABLE_SSL2");
 344     return ERR_UNEXPECTED;
 345   }
 346
 347   SSLVersionRange version_range;
 348   version_range.min = ssl_config_.version_min;
 349   version_range.max = ssl_config_.version_max;
 350   rv = SSL_VersionRangeSet(nss_fd_, &version_range);
 351   if (rv != SECSuccess) {
 352     LogFailedNSSFunction(net_log_, "SSL_VersionRangeSet", "");
 353     return ERR_NO_SSL_VERSIONS_ENABLED;
 354   }
 355
 356   if (ssl_config_.require_ecdhe) {
 357     const PRUint16* const ssl_ciphers = SSL_GetImplementedCiphers();
 358     const PRUint16 num_ciphers = SSL_GetNumImplementedCiphers();
 359
 360     // Iterate over the cipher suites and disable those that don't use ECDHE.
 361     for (unsigned i = 0; i < num_ciphers; i++) {
 362       SSLCipherSuiteInfo info;
 363       if (SSL_GetCipherSuiteInfo(ssl_ciphers[i], &info, sizeof(info)) ==
 364           SECSuccess) {
 365         if (strcmp(info.keaTypeName, "ECDHE") != 0) {
 366           SSL_CipherPrefSet(nss_fd_, ssl_ciphers[i], PR_FALSE);
 367         }
 368       }
 369     }
 370   }
 371
 372   for (std::vector<uint16>::const_iterator it =
 373            ssl_config_.disabled_cipher_suites.begin();
 374        it != ssl_config_.disabled_cipher_suites.end(); ++it) {
 375     // This will fail if the specified cipher is not implemented by NSS, but
 376     // the failure is harmless.
 377     SSL_CipherPrefSet(nss_fd_, *it, PR_FALSE);
 378   }
 379
 380   // Server socket doesn't need session tickets.
 381   rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_SESSION_TICKETS, PR_FALSE);
 382   if (rv != SECSuccess) {
 383     LogFailedNSSFunction(
 384         net_log_, "SSL_OptionSet", "SSL_ENABLE_SESSION_TICKETS");
 385   }
 386
 387   // Doing this will force PR_Accept perform handshake as server.
 388   rv = SSL_OptionSet(nss_fd_, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE);
 389   if (rv != SECSuccess) {
 390     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_HANDSHAKE_AS_CLIENT");
 391     return ERR_UNEXPECTED;
 392   }
 393
 394   rv = SSL_OptionSet(nss_fd_, SSL_HANDSHAKE_AS_SERVER, PR_TRUE);
 395   if (rv != SECSuccess) {
 396     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_HANDSHAKE_AS_SERVER");
 397     return ERR_UNEXPECTED;
 398   }
 399
 400   rv = SSL_OptionSet(nss_fd_, SSL_REQUEST_CERTIFICATE, PR_FALSE);
 401   if (rv != SECSuccess) {
 402     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_REQUEST_CERTIFICATE");
 403     return ERR_UNEXPECTED;
 404   }
 405
 406   rv = SSL_OptionSet(nss_fd_, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
 407   if (rv != SECSuccess) {
 408     LogFailedNSSFunction(net_log_, "SSL_OptionSet", "SSL_REQUIRE_CERTIFICATE");
 409     return ERR_UNEXPECTED;
 410   }
 411
 412   rv = SSL_AuthCertificateHook(nss_fd_, OwnAuthCertHandler, this);
 413   if (rv != SECSuccess) {
 414     LogFailedNSSFunction(net_log_, "SSL_AuthCertificateHook", "");
 415     return ERR_UNEXPECTED;
 416   }
 417
 418   rv = SSL_HandshakeCallback(nss_fd_, HandshakeCallback, this);
 419   if (rv != SECSuccess) {
 420     LogFailedNSSFunction(net_log_, "SSL_HandshakeCallback", "");
 421     return ERR_UNEXPECTED;
 422   }
 423
 424   // Get a certificate of CERTCertificate structure.
 425   std::string der_string;
 426   if (!X509Certificate::GetDEREncoded(cert_->os_cert_handle(), &der_string))
 427     return ERR_UNEXPECTED;
 428
 429   SECItem der_cert;
 430   der_cert.data = reinterpret_cast<unsigned char*>(const_cast<char*>(
 431       der_string.data()));
 432   der_cert.len  = der_string.length();
 433   der_cert.type = siDERCertBuffer;
 434
 435   // Parse into a CERTCertificate structure.
 436   CERTCertificate* cert = CERT_NewTempCertificate(
 437       CERT_GetDefaultCertDB(), &der_cert, NULL, PR_FALSE, PR_TRUE);
 438   if (!cert) {
 439     LogFailedNSSFunction(net_log_, "CERT_NewTempCertificate", "");
 440     return MapNSSError(PORT_GetError());
 441   }
 442
 443   // Get a key of SECKEYPrivateKey* structure.
 444   std::vector<uint8> key_vector;
 445   if (!key_->ExportPrivateKey(&key_vector)) {
 446     CERT_DestroyCertificate(cert);
 447     return ERR_UNEXPECTED;
 448   }
 449
 450   SECKEYPrivateKeyStr* private_key = NULL;
 451   PK11SlotInfo* slot = PK11_GetInternalSlot();
 452   if (!slot) {
 453     CERT_DestroyCertificate(cert);
 454     return ERR_UNEXPECTED;
 455   }
 456
 457   SECItem der_private_key_info;
 458   der_private_key_info.data =
 459       const_cast<unsigned char*>(&key_vector.front());
 460   der_private_key_info.len = key_vector.size();
 461   // The server's RSA private key must be imported into NSS with the
 462   // following key usage bits:
 463   // - KU_KEY_ENCIPHERMENT, required for the RSA key exchange algorithm.
 464   // - KU_DIGITAL_SIGNATURE, required for the DHE_RSA and ECDHE_RSA key
 465   //   exchange algorithms.
 466   const unsigned int key_usage = KU_KEY_ENCIPHERMENT | KU_DIGITAL_SIGNATURE;
 467   rv =  PK11_ImportDERPrivateKeyInfoAndReturnKey(
 468       slot, &der_private_key_info, NULL, NULL, PR_FALSE, PR_FALSE,
 469       key_usage, &private_key, NULL);
 470   PK11_FreeSlot(slot);
 471   if (rv != SECSuccess) {
 472     CERT_DestroyCertificate(cert);
 473     return ERR_UNEXPECTED;
 474   }
 475
 476   // Assign server certificate and private key.
 477   SSLKEAType cert_kea = NSS_FindCertKEAType(cert);
 478   rv = SSL_ConfigSecureServer(nss_fd_, cert, private_key, cert_kea);
 479   CERT_DestroyCertificate(cert);
 480   SECKEY_DestroyPrivateKey(private_key);
 481
 482   if (rv != SECSuccess) {
 483     PRErrorCode prerr = PR_GetError();
 484     LOG(ERROR) << "Failed to config SSL server: " << prerr;
 485     LogFailedNSSFunction(net_log_, "SSL_ConfigureSecureServer", "");
 486     return ERR_UNEXPECTED;
 487   }
 488
 489   // Tell SSL we're a server; needed if not letting NSPR do socket I/O
 490   rv = SSL_ResetHandshake(nss_fd_, PR_TRUE);
 491   if (rv != SECSuccess) {
 492     LogFailedNSSFunction(net_log_, "SSL_ResetHandshake", "");
 493     return ERR_UNEXPECTED;
 494   }
 495
 496   return OK;
 497 }
 498
 499 void SSLServerSocketNSS::OnSendComplete(int result) {
 500   if (next_handshake_state_ == STATE_HANDSHAKE) {
 501     // In handshake phase.
 502     OnHandshakeIOComplete(result);
 503     return;
 504   }
 505
 506   // TODO(byungchul): This state machine is not correct. Copy the state machine
 507   // of SSLClientSocketNSS::OnSendComplete() which handles it better.
 508   if (!completed_handshake_)
 509     return;
 510
 511   if (user_write_buf_.get()) {
 512     int rv = DoWriteLoop(result);
 513     if (rv != ERR_IO_PENDING)
 514       DoWriteCallback(rv);
 515   } else {
 516     // Ensure that any queued ciphertext is flushed.
 517     DoTransportIO();
 518   }
 519 }
 520
 521 void SSLServerSocketNSS::OnRecvComplete(int result) {
 522   if (next_handshake_state_ == STATE_HANDSHAKE) {
 523     // In handshake phase.
 524     OnHandshakeIOComplete(result);
 525     return;
 526   }
 527
 528   // Network layer received some data, check if client requested to read
 529   // decrypted data.
 530   if (!user_read_buf_.get() || !completed_handshake_)
 531     return;
 532
 533   int rv = DoReadLoop(result);
 534   if (rv != ERR_IO_PENDING)
 535     DoReadCallback(rv);
 536 }
 537
 538 void SSLServerSocketNSS::OnHandshakeIOComplete(int result) {
 539   int rv = DoHandshakeLoop(result);
 540   if (rv == ERR_IO_PENDING)
 541     return;
 542
 543   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_SERVER_HANDSHAKE, rv);
 544   if (!user_handshake_callback_.is_null())
 545     DoHandshakeCallback(rv);
 546 }
 547
 548 // Return 0 for EOF,
 549 // > 0 for bytes transferred immediately,
 550 // < 0 for error (or the non-error ERR_IO_PENDING).
 551 int SSLServerSocketNSS::BufferSend(void) {
 552   if (transport_send_busy_)
 553     return ERR_IO_PENDING;
 554
 555   const char* buf1;
 556   const char* buf2;
 557   unsigned int len1, len2;
 558   if (memio_GetWriteParams(nss_bufs_, &buf1, &len1, &buf2, &len2)) {
 559     // The error code itself is ignored, so just return ERR_ABORTED.
 560     return ERR_ABORTED;
 561   }
 562   const size_t len = len1 + len2;
 563
 564   int rv = 0;
 565   if (len) {
 566     scoped_refptr<IOBuffer> send_buffer(new IOBuffer(len));
 567     memcpy(send_buffer->data(), buf1, len1);
 568     memcpy(send_buffer->data() + len1, buf2, len2);
 569     rv = transport_socket_->Write(
 570         send_buffer.get(),
 571         len,
 572         base::Bind(&SSLServerSocketNSS::BufferSendComplete,
 573                    base::Unretained(this)));
 574     if (rv == ERR_IO_PENDING) {
 575       transport_send_busy_ = true;
 576     } else {
 577       memio_PutWriteResult(nss_bufs_, MapErrorToNSS(rv));
 578     }
 579   }
 580
 581   return rv;
 582 }
 583
 584 void SSLServerSocketNSS::BufferSendComplete(int result) {
 585   memio_PutWriteResult(nss_bufs_, MapErrorToNSS(result));
 586   transport_send_busy_ = false;
 587   OnSendComplete(result);
 588 }
 589
 590 int SSLServerSocketNSS::BufferRecv(void) {
 591   if (transport_recv_busy_) return ERR_IO_PENDING;
 592
 593   char* buf;
 594   int nb = memio_GetReadParams(nss_bufs_, &buf);
 595   int rv;
 596   if (!nb) {
 597     // buffer too full to read into, so no I/O possible at moment
 598     rv = ERR_IO_PENDING;
 599   } else {
 600     recv_buffer_ = new IOBuffer(nb);
 601     rv = transport_socket_->Read(
 602         recv_buffer_.get(),
 603         nb,
 604         base::Bind(&SSLServerSocketNSS::BufferRecvComplete,
 605                    base::Unretained(this)));
 606     if (rv == ERR_IO_PENDING) {
 607       transport_recv_busy_ = true;
 608     } else {
 609       if (rv > 0)
 610         memcpy(buf, recv_buffer_->data(), rv);
 611       memio_PutReadResult(nss_bufs_, MapErrorToNSS(rv));
 612       recv_buffer_ = NULL;
 613     }
 614   }
 615   return rv;
 616 }
 617
 618 void SSLServerSocketNSS::BufferRecvComplete(int result) {
 619   if (result > 0) {
 620     char* buf;
 621     memio_GetReadParams(nss_bufs_, &buf);
 622     memcpy(buf, recv_buffer_->data(), result);
 623   }
 624   recv_buffer_ = NULL;
 625   memio_PutReadResult(nss_bufs_, MapErrorToNSS(result));
 626   transport_recv_busy_ = false;
 627   OnRecvComplete(result);
 628 }
 629
 630 // Do as much network I/O as possible between the buffer and the
 631 // transport socket. Return true if some I/O performed, false
 632 // otherwise (error or ERR_IO_PENDING).
 633 bool SSLServerSocketNSS::DoTransportIO() {
 634   bool network_moved = false;
 635   if (nss_bufs_ != NULL) {
 636     int rv;
 637     // Read and write as much data as we can. The loop is neccessary
 638     // because Write() may return synchronously.
 639     do {
 640       rv = BufferSend();
 641       if (rv > 0)
 642         network_moved = true;
 643     } while (rv > 0);
 644     if (BufferRecv() >= 0)
 645       network_moved = true;
 646   }
 647   return network_moved;
 648 }
 649
 650 int SSLServerSocketNSS::DoPayloadRead() {
 651   DCHECK(user_read_buf_.get());
 652   DCHECK_GT(user_read_buf_len_, 0);
 653   int rv = PR_Read(nss_fd_, user_read_buf_->data(), user_read_buf_len_);
 654   if (rv >= 0)
 655     return rv;
 656   PRErrorCode prerr = PR_GetError();
 657   if (prerr == PR_WOULD_BLOCK_ERROR) {
 658     return ERR_IO_PENDING;
 659   }
 660   rv = MapNSSError(prerr);
 661   net_log_.AddEvent(NetLog::TYPE_SSL_READ_ERROR,
 662                     CreateNetLogSSLErrorCallback(rv, prerr));
 663   return rv;
 664 }
 665
 666 int SSLServerSocketNSS::DoPayloadWrite() {
 667   DCHECK(user_write_buf_.get());
 668   int rv = PR_Write(nss_fd_, user_write_buf_->data(), user_write_buf_len_);
 669   if (rv >= 0)
 670     return rv;
 671   PRErrorCode prerr = PR_GetError();
 672   if (prerr == PR_WOULD_BLOCK_ERROR) {
 673     return ERR_IO_PENDING;
 674   }
 675   rv = MapNSSError(prerr);
 676   net_log_.AddEvent(NetLog::TYPE_SSL_WRITE_ERROR,
 677                     CreateNetLogSSLErrorCallback(rv, prerr));
 678   return rv;
 679 }
 680
 681 int SSLServerSocketNSS::DoHandshakeLoop(int last_io_result) {
 682   int rv = last_io_result;
 683   do {
 684     // Default to STATE_NONE for next state.
 685     // (This is a quirk carried over from the windows
 686     // implementation.  It makes reading the logs a bit harder.)
 687     // State handlers can and often do call GotoState just
 688     // to stay in the current state.
 689     State state = next_handshake_state_;
 690     GotoState(STATE_NONE);
 691     switch (state) {
 692       case STATE_HANDSHAKE:
 693         rv = DoHandshake();
 694         break;
 695       case STATE_NONE:
 696       default:
 697         rv = ERR_UNEXPECTED;
 698         LOG(DFATAL) << "unexpected state " << state;
 699         break;
 700     }
 701
 702     // Do the actual network I/O
 703     bool network_moved = DoTransportIO();
 704     if (network_moved && next_handshake_state_ == STATE_HANDSHAKE) {
 705       // In general we exit the loop if rv is ERR_IO_PENDING.  In this
 706       // special case we keep looping even if rv is ERR_IO_PENDING because
 707       // the transport IO may allow DoHandshake to make progress.
 708       rv = OK;  // This causes us to stay in the loop.
 709     }
 710   } while (rv != ERR_IO_PENDING && next_handshake_state_ != STATE_NONE);
 711   return rv;
 712 }
 713
 714 int SSLServerSocketNSS::DoReadLoop(int result) {
 715   DCHECK(completed_handshake_);
 716   DCHECK(next_handshake_state_ == STATE_NONE);
 717
 718   if (result < 0)
 719     return result;
 720
 721   if (!nss_bufs_) {
 722     LOG(DFATAL) << "!nss_bufs_";
 723     int rv = ERR_UNEXPECTED;
 724     net_log_.AddEvent(NetLog::TYPE_SSL_READ_ERROR,
 725                       CreateNetLogSSLErrorCallback(rv, 0));
 726     return rv;
 727   }
 728
 729   bool network_moved;
 730   int rv;
 731   do {
 732     rv = DoPayloadRead();
 733     network_moved = DoTransportIO();
 734   } while (rv == ERR_IO_PENDING && network_moved);
 735   return rv;
 736 }
 737
 738 int SSLServerSocketNSS::DoWriteLoop(int result) {
 739   DCHECK(completed_handshake_);
 740   DCHECK_EQ(next_handshake_state_, STATE_NONE);
 741
 742   if (result < 0)
 743     return result;
 744
 745   if (!nss_bufs_) {
 746     LOG(DFATAL) << "!nss_bufs_";
 747     int rv = ERR_UNEXPECTED;
 748     net_log_.AddEvent(NetLog::TYPE_SSL_WRITE_ERROR,
 749                       CreateNetLogSSLErrorCallback(rv, 0));
 750     return rv;
 751   }
 752
 753   bool network_moved;
 754   int rv;
 755   do {
 756     rv = DoPayloadWrite();
 757     network_moved = DoTransportIO();
 758   } while (rv == ERR_IO_PENDING && network_moved);
 759   return rv;
 760 }
 761
 762 int SSLServerSocketNSS::DoHandshake() {
 763   int net_error = OK;
 764   SECStatus rv = SSL_ForceHandshake(nss_fd_);
 765
 766   if (rv == SECSuccess) {
 767     completed_handshake_ = true;
 768   } else {
 769     PRErrorCode prerr = PR_GetError();
 770     net_error = MapNSSError(prerr);
 771
 772     // If not done, stay in this state
 773     if (net_error == ERR_IO_PENDING) {
 774       GotoState(STATE_HANDSHAKE);
 775     } else {
 776       LOG(ERROR) << "handshake failed; NSS error code " << prerr
 777                  << ", net_error " << net_error;
 778       net_log_.AddEvent(NetLog::TYPE_SSL_HANDSHAKE_ERROR,
 779                         CreateNetLogSSLErrorCallback(net_error, prerr));
 780     }
 781   }
 782   return net_error;
 783 }
 784
 785 void SSLServerSocketNSS::DoHandshakeCallback(int rv) {
 786   DCHECK_NE(rv, ERR_IO_PENDING);
 787   ResetAndReturn(&user_handshake_callback_).Run(rv > OK ? OK : rv);
 788 }
 789
 790 void SSLServerSocketNSS::DoReadCallback(int rv) {
 791   DCHECK(rv != ERR_IO_PENDING);
 792   DCHECK(!user_read_callback_.is_null());
 793
 794   user_read_buf_ = NULL;
 795   user_read_buf_len_ = 0;
 796   ResetAndReturn(&user_read_callback_).Run(rv);
 797 }
 798
 799 void SSLServerSocketNSS::DoWriteCallback(int rv) {
 800   DCHECK(rv != ERR_IO_PENDING);
 801   DCHECK(!user_write_callback_.is_null());
 802
 803   user_write_buf_ = NULL;
 804   user_write_buf_len_ = 0;
 805   ResetAndReturn(&user_write_callback_).Run(rv);
 806 }
 807
 808 // static
 809 // NSS calls this if an incoming certificate needs to be verified.
 810 // Do nothing but return SECSuccess.
 811 // This is called only in full handshake mode.
 812 // Peer certificate is retrieved in HandshakeCallback() later, which is called
 813 // in full handshake mode or in resumption handshake mode.
 814 SECStatus SSLServerSocketNSS::OwnAuthCertHandler(void* arg,
 815                                                  PRFileDesc* socket,
 816                                                  PRBool checksig,
 817                                                  PRBool is_server) {
 818   // TODO(hclam): Implement.
 819   // Tell NSS to not verify the certificate.
 820   return SECSuccess;
 821 }
 822
 823 // static
 824 // NSS calls this when handshake is completed.
 825 // After the SSL handshake is finished we need to verify the certificate.
 826 void SSLServerSocketNSS::HandshakeCallback(PRFileDesc* socket,
 827                                            void* arg) {
 828   // TODO(hclam): Implement.
 829 }
 830
 831 int SSLServerSocketNSS::Init() {
 832   // Initialize the NSS SSL library in a threadsafe way.  This also
 833   // initializes the NSS base library.
 834   EnsureNSSSSLInit();
 835   if (!NSS_IsInitialized())
 836     return ERR_UNEXPECTED;
 837
 838   EnableSSLServerSockets();
 839   return OK;
 840 }
 841
 842 }  // namespace net