2 * Copyright 2015 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <folly/io/async/AsyncSSLSocket.h>
19 #include <folly/io/async/EventBase.h>
21 #include <boost/noncopyable.hpp>
24 #include <netinet/in.h>
25 #include <netinet/tcp.h>
26 #include <openssl/err.h>
27 #include <openssl/asn1.h>
28 #include <openssl/ssl.h>
29 #include <sys/types.h>
30 #include <sys/socket.h>
34 #include <folly/Bits.h>
35 #include <folly/SocketAddress.h>
36 #include <folly/SpinLock.h>
37 #include <folly/io/IOBuf.h>
38 #include <folly/io/Cursor.h>
40 using folly::SocketAddress;
41 using folly::SSLContext;
43 using std::shared_ptr;
47 using folly::SpinLock;
48 using folly::SpinLockGuard;
49 using folly::io::Cursor;
50 using std::unique_ptr;
54 using folly::AsyncSocket;
55 using folly::AsyncSocketException;
56 using folly::AsyncSSLSocket;
57 using folly::Optional;
59 // We have one single dummy SSL context so that we can implement attach
60 // and detach methods in a thread safe fashion without modifying opnessl.
61 static SSLContext *dummyCtx = nullptr;
62 static SpinLock dummyCtxLock;
64 // Numbers chosen as to not collide with functions in ssl.h
65 const uint8_t TASYNCSSLSOCKET_F_PERFORM_READ = 90;
66 const uint8_t TASYNCSSLSOCKET_F_PERFORM_WRITE = 91;
68 // If given min write size is less than this, buffer will be allocated on
69 // stack, otherwise it is allocated on heap
70 const size_t MAX_STACK_BUF_SIZE = 2048;
72 // This converts "illegal" shutdowns into ZERO_RETURN
73 inline bool zero_return(int error, int rc) {
74 return (error == SSL_ERROR_ZERO_RETURN || (rc == 0 && errno == 0));
77 class AsyncSSLSocketConnector: public AsyncSocket::ConnectCallback,
78 public AsyncSSLSocket::HandshakeCB {
81 AsyncSSLSocket *sslSocket_;
82 AsyncSSLSocket::ConnectCallback *callback_;
87 ~AsyncSSLSocketConnector() override {}
90 AsyncSSLSocketConnector(AsyncSSLSocket *sslSocket,
91 AsyncSocket::ConnectCallback *callback,
93 sslSocket_(sslSocket),
96 startTime_(std::chrono::duration_cast<std::chrono::milliseconds>(
97 std::chrono::steady_clock::now().time_since_epoch()).count()) {
100 void connectSuccess() noexcept override {
101 VLOG(7) << "client socket connected";
103 int64_t timeoutLeft = 0;
105 auto curTime = std::chrono::duration_cast<std::chrono::milliseconds>(
106 std::chrono::steady_clock::now().time_since_epoch()).count();
108 timeoutLeft = timeout_ - (curTime - startTime_);
109 if (timeoutLeft <= 0) {
110 AsyncSocketException ex(AsyncSocketException::TIMED_OUT,
111 "SSL connect timed out");
117 sslSocket_->sslConn(this, timeoutLeft);
120 void connectErr(const AsyncSocketException& ex) noexcept override {
121 LOG(ERROR) << "TCP connect failed: " << ex.what();
126 void handshakeSuc(AsyncSSLSocket* sock) noexcept override {
127 VLOG(7) << "client handshake success";
129 callback_->connectSuccess();
134 void handshakeErr(AsyncSSLSocket* socket,
135 const AsyncSocketException& ex) noexcept override {
136 LOG(ERROR) << "client handshakeErr: " << ex.what();
141 void fail(const AsyncSocketException &ex) {
142 // fail is a noop if called twice
144 AsyncSSLSocket::ConnectCallback *cb = callback_;
148 sslSocket_->closeNow();
149 // closeNow can call handshakeErr if it hasn't been called already.
150 // So this may have been deleted, no member variable access beyond this
152 // Note that closeNow may invoke writeError callbacks if the socket had
153 // write data pending connection completion.
158 // XXX: implement an equivalent to corking for platforms with TCP_NOPUSH?
159 #ifdef TCP_CORK // Linux-only
161 * Utility class that corks a TCP socket upon construction or uncorks
162 * the socket upon destruction
164 class CorkGuard : private boost::noncopyable {
166 CorkGuard(int fd, bool multipleWrites, bool haveMore, bool* corked):
167 fd_(fd), haveMore_(haveMore), corked_(corked) {
169 // socket is already corked; nothing to do
172 if (multipleWrites || haveMore) {
173 // We are performing multiple writes in this performWrite() call,
174 // and/or there are more calls to performWrite() that will be invoked
175 // later, so enable corking
177 setsockopt(fd_, IPPROTO_TCP, TCP_CORK, &flag, sizeof(flag));
184 // more data to come; don't uncork yet
188 // socket isn't corked; nothing to do
193 setsockopt(fd_, IPPROTO_TCP, TCP_CORK, &flag, sizeof(flag));
203 class CorkGuard : private boost::noncopyable {
205 CorkGuard(int, bool, bool, bool*) {}
209 void setup_SSL_CTX(SSL_CTX *ctx) {
210 #ifdef SSL_MODE_RELEASE_BUFFERS
211 SSL_CTX_set_mode(ctx,
212 SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
213 SSL_MODE_ENABLE_PARTIAL_WRITE
214 | SSL_MODE_RELEASE_BUFFERS
217 SSL_CTX_set_mode(ctx,
218 SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
219 SSL_MODE_ENABLE_PARTIAL_WRITE
222 // SSL_CTX_set_mode is a Macro
223 #ifdef SSL_MODE_WRITE_IOVEC
224 SSL_CTX_set_mode(ctx,
225 SSL_CTX_get_mode(ctx)
226 | SSL_MODE_WRITE_IOVEC);
231 BIO_METHOD eorAwareBioMethod;
233 void* initEorBioMethod(void) {
234 memcpy(&eorAwareBioMethod, BIO_s_socket(), sizeof(eorAwareBioMethod));
235 // override the bwrite method for MSG_EOR support
236 eorAwareBioMethod.bwrite = AsyncSSLSocket::eorAwareBioWrite;
238 // Note that the eorAwareBioMethod.type and eorAwareBioMethod.name are not
239 // set here. openssl code seems to be checking ".type == BIO_TYPE_SOCKET" and
240 // then have specific handlings. The eorAwareBioWrite should be compatible
241 // with the one in openssl.
243 // Return something here to enable AsyncSSLSocket to call this method using
244 // a function-scoped static.
248 } // anonymous namespace
252 SSLException::SSLException(int sslError, int errno_copy):
253 AsyncSocketException(
254 AsyncSocketException::SSL_ERROR,
255 ERR_error_string(sslError, msg_),
256 sslError == SSL_ERROR_SYSCALL ? errno_copy : 0), error_(sslError) {}
259 * Create a client AsyncSSLSocket
261 AsyncSSLSocket::AsyncSSLSocket(const shared_ptr<SSLContext> &ctx,
262 EventBase* evb, bool deferSecurityNegotiation) :
265 handshakeTimeout_(this, evb) {
267 if (deferSecurityNegotiation) {
268 sslState_ = STATE_UNENCRYPTED;
273 * Create a server/client AsyncSSLSocket
275 AsyncSSLSocket::AsyncSSLSocket(const shared_ptr<SSLContext>& ctx,
276 EventBase* evb, int fd, bool server,
277 bool deferSecurityNegotiation) :
278 AsyncSocket(evb, fd),
281 handshakeTimeout_(this, evb) {
284 SSL_CTX_set_info_callback(ctx_->getSSLCtx(),
285 AsyncSSLSocket::sslInfoCallback);
287 if (deferSecurityNegotiation) {
288 sslState_ = STATE_UNENCRYPTED;
292 #if OPENSSL_VERSION_NUMBER >= 0x1000105fL && !defined(OPENSSL_NO_TLSEXT)
294 * Create a client AsyncSSLSocket and allow tlsext_hostname
295 * to be sent in Client Hello.
297 AsyncSSLSocket::AsyncSSLSocket(const shared_ptr<SSLContext> &ctx,
299 const std::string& serverName,
300 bool deferSecurityNegotiation) :
301 AsyncSSLSocket(ctx, evb, deferSecurityNegotiation) {
302 tlsextHostname_ = serverName;
306 * Create a client AsyncSSLSocket from an already connected fd
307 * and allow tlsext_hostname to be sent in Client Hello.
309 AsyncSSLSocket::AsyncSSLSocket(const shared_ptr<SSLContext>& ctx,
310 EventBase* evb, int fd,
311 const std::string& serverName,
312 bool deferSecurityNegotiation) :
313 AsyncSSLSocket(ctx, evb, fd, false, deferSecurityNegotiation) {
314 tlsextHostname_ = serverName;
318 AsyncSSLSocket::~AsyncSSLSocket() {
319 VLOG(3) << "actual destruction of AsyncSSLSocket(this=" << this
320 << ", evb=" << eventBase_ << ", fd=" << fd_
321 << ", state=" << int(state_) << ", sslState="
322 << sslState_ << ", events=" << eventFlags_ << ")";
325 void AsyncSSLSocket::init() {
326 // Do this here to ensure we initialize this once before any use of
327 // AsyncSSLSocket instances and not as part of library load.
328 static const auto eorAwareBioMethodInitializer = initEorBioMethod();
329 setup_SSL_CTX(ctx_->getSSLCtx());
332 void AsyncSSLSocket::closeNow() {
333 // Close the SSL connection.
334 if (ssl_ != nullptr && fd_ != -1) {
335 int rc = SSL_shutdown(ssl_);
337 rc = SSL_shutdown(ssl_);
344 if (sslSession_ != nullptr) {
345 SSL_SESSION_free(sslSession_);
346 sslSession_ = nullptr;
349 sslState_ = STATE_CLOSED;
351 if (handshakeTimeout_.isScheduled()) {
352 handshakeTimeout_.cancelTimeout();
355 DestructorGuard dg(this);
357 if (handshakeCallback_) {
358 AsyncSocketException ex(AsyncSocketException::END_OF_FILE,
359 "SSL connection closed locally");
360 HandshakeCB* callback = handshakeCallback_;
361 handshakeCallback_ = nullptr;
362 callback->handshakeErr(this, ex);
365 if (ssl_ != nullptr) {
371 AsyncSocket::closeNow();
374 void AsyncSSLSocket::shutdownWrite() {
375 // SSL sockets do not support half-shutdown, so just perform a full shutdown.
377 // (Performing a full shutdown here is more desirable than doing nothing at
378 // all. The purpose of shutdownWrite() is normally to notify the other end
379 // of the connection that no more data will be sent. If we do nothing, the
380 // other end will never know that no more data is coming, and this may result
381 // in protocol deadlock.)
385 void AsyncSSLSocket::shutdownWriteNow() {
389 bool AsyncSSLSocket::good() const {
390 return (AsyncSocket::good() &&
391 (sslState_ == STATE_ACCEPTING || sslState_ == STATE_CONNECTING ||
392 sslState_ == STATE_ESTABLISHED || sslState_ == STATE_UNENCRYPTED));
395 // The TAsyncTransport definition of 'good' states that the transport is
396 // ready to perform reads and writes, so sslState_ == UNINIT must report !good.
397 // connecting can be true when the sslState_ == UNINIT because the AsyncSocket
398 // is connected but we haven't initiated the call to SSL_connect.
399 bool AsyncSSLSocket::connecting() const {
401 (AsyncSocket::connecting() ||
402 (AsyncSocket::good() && (sslState_ == STATE_UNINIT ||
403 sslState_ == STATE_CONNECTING))));
406 bool AsyncSSLSocket::isEorTrackingEnabled() const {
407 const BIO *wb = SSL_get_wbio(ssl_);
408 return wb && wb->method == &eorAwareBioMethod;
411 void AsyncSSLSocket::setEorTracking(bool track) {
412 BIO *wb = SSL_get_wbio(ssl_);
414 throw AsyncSocketException(AsyncSocketException::INVALID_STATE,
415 "setting EOR tracking without an initialized "
420 if (wb->method != &eorAwareBioMethod) {
421 // only do this if we didn't
422 wb->method = &eorAwareBioMethod;
423 BIO_set_app_data(wb, this);
425 minEorRawByteNo_ = 0;
427 } else if (wb->method == &eorAwareBioMethod) {
428 wb->method = BIO_s_socket();
429 BIO_set_app_data(wb, nullptr);
431 minEorRawByteNo_ = 0;
433 CHECK(wb->method == BIO_s_socket());
437 size_t AsyncSSLSocket::getRawBytesWritten() const {
439 if (!ssl_ || !(b = SSL_get_wbio(ssl_))) {
443 return BIO_number_written(b);
446 size_t AsyncSSLSocket::getRawBytesReceived() const {
448 if (!ssl_ || !(b = SSL_get_rbio(ssl_))) {
452 return BIO_number_read(b);
456 void AsyncSSLSocket::invalidState(HandshakeCB* callback) {
457 LOG(ERROR) << "AsyncSSLSocket(this=" << this << ", fd=" << fd_
458 << ", state=" << int(state_) << ", sslState=" << sslState_ << ", "
459 << "events=" << eventFlags_ << ", server=" << short(server_) << "): "
460 << "sslAccept/Connect() called in invalid "
461 << "state, handshake callback " << handshakeCallback_ << ", new callback "
463 assert(!handshakeTimeout_.isScheduled());
464 sslState_ = STATE_ERROR;
466 AsyncSocketException ex(AsyncSocketException::INVALID_STATE,
467 "sslAccept() called with socket in invalid state");
470 callback->handshakeErr(this, ex);
473 // Check the socket state not the ssl state here.
474 if (state_ != StateEnum::CLOSED || state_ != StateEnum::ERROR) {
475 failHandshake(__func__, ex);
479 void AsyncSSLSocket::sslAccept(HandshakeCB* callback, uint32_t timeout,
480 const SSLContext::SSLVerifyPeerEnum& verifyPeer) {
481 DestructorGuard dg(this);
482 assert(eventBase_->isInEventBaseThread());
483 verifyPeer_ = verifyPeer;
485 // Make sure we're in the uninitialized state
486 if (!server_ || (sslState_ != STATE_UNINIT &&
487 sslState_ != STATE_UNENCRYPTED) ||
488 handshakeCallback_ != nullptr) {
489 return invalidState(callback);
492 sslState_ = STATE_ACCEPTING;
493 handshakeCallback_ = callback;
496 handshakeTimeout_.scheduleTimeout(timeout);
499 /* register for a read operation (waiting for CLIENT HELLO) */
500 updateEventRegistration(EventHandler::READ, EventHandler::WRITE);
503 #if OPENSSL_VERSION_NUMBER >= 0x009080bfL
504 void AsyncSSLSocket::attachSSLContext(
505 const std::shared_ptr<SSLContext>& ctx) {
507 // Check to ensure we are in client mode. Changing a server's ssl
508 // context doesn't make sense since clients of that server would likely
509 // become confused when the server's context changes.
513 DCHECK(ctx->getSSLCtx());
516 // In order to call attachSSLContext, detachSSLContext must have been
517 // previously called which sets the socket's context to the dummy
518 // context. Thus we must acquire this lock.
519 SpinLockGuard guard(dummyCtxLock);
520 SSL_set_SSL_CTX(ssl_, ctx->getSSLCtx());
523 void AsyncSSLSocket::detachSSLContext() {
526 // We aren't using the initial_ctx for now, and it can introduce race
527 // conditions in the destructor of the SSL object.
528 #ifndef OPENSSL_NO_TLSEXT
529 if (ssl_->initial_ctx) {
530 SSL_CTX_free(ssl_->initial_ctx);
531 ssl_->initial_ctx = nullptr;
534 SpinLockGuard guard(dummyCtxLock);
535 if (nullptr == dummyCtx) {
536 // We need to lazily initialize the dummy context so we don't
537 // accidentally override any programmatic settings to openssl
538 dummyCtx = new SSLContext;
540 // We must remove this socket's references to its context right now
541 // since this socket could get passed to any thread. If the context has
542 // had its locking disabled, just doing a set in attachSSLContext()
543 // would not be thread safe.
544 SSL_set_SSL_CTX(ssl_, dummyCtx->getSSLCtx());
548 #if OPENSSL_VERSION_NUMBER >= 0x1000105fL && !defined(OPENSSL_NO_TLSEXT)
549 void AsyncSSLSocket::switchServerSSLContext(
550 const std::shared_ptr<SSLContext>& handshakeCtx) {
552 if (sslState_ != STATE_ACCEPTING) {
553 // We log it here and allow the switch.
554 // It should not affect our re-negotiation support (which
555 // is not supported now).
556 VLOG(6) << "fd=" << getFd()
557 << " renegotation detected when switching SSL_CTX";
560 setup_SSL_CTX(handshakeCtx->getSSLCtx());
561 SSL_CTX_set_info_callback(handshakeCtx->getSSLCtx(),
562 AsyncSSLSocket::sslInfoCallback);
563 handshakeCtx_ = handshakeCtx;
564 SSL_set_SSL_CTX(ssl_, handshakeCtx->getSSLCtx());
567 bool AsyncSSLSocket::isServerNameMatch() const {
574 SSL_SESSION *ss = SSL_get_session(ssl_);
579 if(!ss->tlsext_hostname) {
582 return (tlsextHostname_.compare(ss->tlsext_hostname) ? false : true);
585 void AsyncSSLSocket::setServerName(std::string serverName) noexcept {
586 tlsextHostname_ = std::move(serverName);
591 void AsyncSSLSocket::timeoutExpired() noexcept {
592 if (state_ == StateEnum::ESTABLISHED &&
593 (sslState_ == STATE_CACHE_LOOKUP ||
594 sslState_ == STATE_RSA_ASYNC_PENDING)) {
595 sslState_ = STATE_ERROR;
596 // We are expecting a callback in restartSSLAccept. The cache lookup
597 // and rsa-call necessarily have pointers to this ssl socket, so delay
598 // the cleanup until he calls us back.
600 assert(state_ == StateEnum::ESTABLISHED &&
601 (sslState_ == STATE_CONNECTING || sslState_ == STATE_ACCEPTING));
602 DestructorGuard dg(this);
603 AsyncSocketException ex(AsyncSocketException::TIMED_OUT,
604 (sslState_ == STATE_CONNECTING) ?
605 "SSL connect timed out" : "SSL accept timed out");
606 failHandshake(__func__, ex);
610 int AsyncSSLSocket::sslExDataIndex_ = -1;
611 std::mutex AsyncSSLSocket::mutex_;
613 int AsyncSSLSocket::getSSLExDataIndex() {
614 if (sslExDataIndex_ < 0) {
615 std::lock_guard<std::mutex> g(mutex_);
616 if (sslExDataIndex_ < 0) {
617 sslExDataIndex_ = SSL_get_ex_new_index(0,
618 (void*)"AsyncSSLSocket data index", nullptr, nullptr, nullptr);
621 return sslExDataIndex_;
624 AsyncSSLSocket* AsyncSSLSocket::getFromSSL(const SSL *ssl) {
625 return static_cast<AsyncSSLSocket *>(SSL_get_ex_data(ssl,
626 getSSLExDataIndex()));
629 void AsyncSSLSocket::failHandshake(const char* fn,
630 const AsyncSocketException& ex) {
633 if (handshakeTimeout_.isScheduled()) {
634 handshakeTimeout_.cancelTimeout();
636 if (handshakeCallback_ != nullptr) {
637 HandshakeCB* callback = handshakeCallback_;
638 handshakeCallback_ = nullptr;
639 callback->handshakeErr(this, ex);
645 void AsyncSSLSocket::invokeHandshakeCB() {
646 if (handshakeTimeout_.isScheduled()) {
647 handshakeTimeout_.cancelTimeout();
649 if (handshakeCallback_) {
650 HandshakeCB* callback = handshakeCallback_;
651 handshakeCallback_ = nullptr;
652 callback->handshakeSuc(this);
656 void AsyncSSLSocket::connect(ConnectCallback* callback,
657 const folly::SocketAddress& address,
659 const OptionMap &options,
660 const folly::SocketAddress& bindAddr)
663 assert(state_ == StateEnum::UNINIT);
664 assert(sslState_ == STATE_UNINIT);
665 AsyncSSLSocketConnector *connector =
666 new AsyncSSLSocketConnector(this, callback, timeout);
667 AsyncSocket::connect(connector, address, timeout, options, bindAddr);
670 void AsyncSSLSocket::applyVerificationOptions(SSL * ssl) {
671 // apply the settings specified in verifyPeer_
672 if (verifyPeer_ == SSLContext::SSLVerifyPeerEnum::USE_CTX) {
673 if(ctx_->needsPeerVerification()) {
674 SSL_set_verify(ssl, ctx_->getVerificationMode(),
675 AsyncSSLSocket::sslVerifyCallback);
678 if (verifyPeer_ == SSLContext::SSLVerifyPeerEnum::VERIFY ||
679 verifyPeer_ == SSLContext::SSLVerifyPeerEnum::VERIFY_REQ_CLIENT_CERT) {
680 SSL_set_verify(ssl, SSLContext::getVerificationMode(verifyPeer_),
681 AsyncSSLSocket::sslVerifyCallback);
686 void AsyncSSLSocket::sslConn(HandshakeCB* callback, uint64_t timeout,
687 const SSLContext::SSLVerifyPeerEnum& verifyPeer) {
688 DestructorGuard dg(this);
689 assert(eventBase_->isInEventBaseThread());
691 verifyPeer_ = verifyPeer;
693 // Make sure we're in the uninitialized state
694 if (server_ || (sslState_ != STATE_UNINIT && sslState_ !=
695 STATE_UNENCRYPTED) ||
696 handshakeCallback_ != nullptr) {
697 return invalidState(callback);
700 sslState_ = STATE_CONNECTING;
701 handshakeCallback_ = callback;
704 ssl_ = ctx_->createSSL();
705 } catch (std::exception &e) {
706 sslState_ = STATE_ERROR;
707 AsyncSocketException ex(AsyncSocketException::INTERNAL_ERROR,
708 "error calling SSLContext::createSSL()");
709 LOG(ERROR) << "AsyncSSLSocket::sslConn(this=" << this << ", fd="
710 << fd_ << "): " << e.what();
711 return failHandshake(__func__, ex);
714 applyVerificationOptions(ssl_);
716 SSL_set_fd(ssl_, fd_);
717 if (sslSession_ != nullptr) {
718 SSL_set_session(ssl_, sslSession_);
719 SSL_SESSION_free(sslSession_);
720 sslSession_ = nullptr;
722 #if OPENSSL_VERSION_NUMBER >= 0x1000105fL && !defined(OPENSSL_NO_TLSEXT)
723 if (tlsextHostname_.size()) {
724 SSL_set_tlsext_host_name(ssl_, tlsextHostname_.c_str());
728 SSL_set_ex_data(ssl_, getSSLExDataIndex(), this);
731 handshakeTimeout_.scheduleTimeout(timeout);
737 SSL_SESSION *AsyncSSLSocket::getSSLSession() {
738 if (ssl_ != nullptr && sslState_ == STATE_ESTABLISHED) {
739 return SSL_get1_session(ssl_);
745 void AsyncSSLSocket::setSSLSession(SSL_SESSION *session, bool takeOwnership) {
746 sslSession_ = session;
747 if (!takeOwnership && session != nullptr) {
748 // Increment the reference count
749 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION);
753 void AsyncSSLSocket::getSelectedNextProtocol(const unsigned char** protoName,
754 unsigned* protoLen) const {
755 if (!getSelectedNextProtocolNoThrow(protoName, protoLen)) {
756 throw AsyncSocketException(AsyncSocketException::NOT_SUPPORTED,
757 "NPN not supported");
761 bool AsyncSSLSocket::getSelectedNextProtocolNoThrow(
762 const unsigned char** protoName,
763 unsigned* protoLen) const {
764 *protoName = nullptr;
766 #ifdef OPENSSL_NPN_NEGOTIATED
767 SSL_get0_next_proto_negotiated(ssl_, protoName, protoLen);
774 bool AsyncSSLSocket::getSSLSessionReused() const {
775 if (ssl_ != nullptr && sslState_ == STATE_ESTABLISHED) {
776 return SSL_session_reused(ssl_);
781 const char *AsyncSSLSocket::getNegotiatedCipherName() const {
782 return (ssl_ != nullptr) ? SSL_get_cipher_name(ssl_) : nullptr;
785 const char *AsyncSSLSocket::getSSLServerName() const {
786 #ifdef SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
787 return (ssl_ != nullptr) ? SSL_get_servername(ssl_, TLSEXT_NAMETYPE_host_name)
790 throw AsyncSocketException(AsyncSocketException::NOT_SUPPORTED,
791 "SNI not supported");
795 const char *AsyncSSLSocket::getSSLServerNameNoThrow() const {
797 return getSSLServerName();
798 } catch (AsyncSocketException& ex) {
803 int AsyncSSLSocket::getSSLVersion() const {
804 return (ssl_ != nullptr) ? SSL_version(ssl_) : 0;
807 int AsyncSSLSocket::getSSLCertSize() const {
809 X509 *cert = (ssl_ != nullptr) ? SSL_get_certificate(ssl_) : nullptr;
811 EVP_PKEY *key = X509_get_pubkey(cert);
812 certSize = EVP_PKEY_bits(key);
818 bool AsyncSSLSocket::willBlock(int ret, int *errorOut) noexcept {
819 int error = *errorOut = SSL_get_error(ssl_, ret);
820 if (error == SSL_ERROR_WANT_READ) {
821 // Register for read event if not already.
822 updateEventRegistration(EventHandler::READ, EventHandler::WRITE);
824 } else if (error == SSL_ERROR_WANT_WRITE) {
825 VLOG(3) << "AsyncSSLSocket(fd=" << fd_
826 << ", state=" << int(state_) << ", sslState="
827 << sslState_ << ", events=" << eventFlags_ << "): "
828 << "SSL_ERROR_WANT_WRITE";
829 // Register for write event if not already.
830 updateEventRegistration(EventHandler::WRITE, EventHandler::READ);
832 #ifdef SSL_ERROR_WANT_SESS_CACHE_LOOKUP
833 } else if (error == SSL_ERROR_WANT_SESS_CACHE_LOOKUP) {
834 // We will block but we can't register our own socket. The callback that
835 // triggered this code will re-call handleAccept at the appropriate time.
837 // We can only get here if the linked libssl.so has support for this feature
838 // as well, otherwise SSL_get_error cannot return our error code.
839 sslState_ = STATE_CACHE_LOOKUP;
841 // Unregister for all events while blocked here
842 updateEventRegistration(EventHandler::NONE,
843 EventHandler::READ | EventHandler::WRITE);
845 // The timeout (if set) keeps running here
848 #ifdef SSL_ERROR_WANT_RSA_ASYNC_PENDING
849 } else if (error == SSL_ERROR_WANT_RSA_ASYNC_PENDING) {
850 // Our custom openssl function has kicked off an async request to do
851 // modular exponentiation. When that call returns, a callback will
852 // be invoked that will re-call handleAccept.
853 sslState_ = STATE_RSA_ASYNC_PENDING;
855 // Unregister for all events while blocked here
856 updateEventRegistration(
858 EventHandler::READ | EventHandler::WRITE
861 // The timeout (if set) keeps running here
865 // SSL_ERROR_ZERO_RETURN is processed here so we can get some detail
867 long lastError = ERR_get_error();
868 VLOG(6) << "AsyncSSLSocket(fd=" << fd_ << ", "
869 << "state=" << state_ << ", "
870 << "sslState=" << sslState_ << ", "
871 << "events=" << std::hex << eventFlags_ << "): "
872 << "SSL error: " << error << ", "
873 << "errno: " << errno << ", "
874 << "ret: " << ret << ", "
875 << "read: " << BIO_number_read(SSL_get_rbio(ssl_)) << ", "
876 << "written: " << BIO_number_written(SSL_get_wbio(ssl_)) << ", "
877 << "func: " << ERR_func_error_string(lastError) << ", "
878 << "reason: " << ERR_reason_error_string(lastError);
879 if (error != SSL_ERROR_SYSCALL) {
880 if (error == SSL_ERROR_SSL) {
881 *errorOut = lastError;
883 if ((unsigned long)lastError < 0x8000) {
894 void AsyncSSLSocket::checkForImmediateRead() noexcept {
895 // openssl may have buffered data that it read from the socket already.
896 // In this case we have to process it immediately, rather than waiting for
897 // the socket to become readable again.
898 if (ssl_ != nullptr && SSL_pending(ssl_) > 0) {
899 AsyncSocket::handleRead();
904 AsyncSSLSocket::restartSSLAccept()
906 VLOG(3) << "AsyncSSLSocket::restartSSLAccept() this=" << this << ", fd=" << fd_
907 << ", state=" << int(state_) << ", "
908 << "sslState=" << sslState_ << ", events=" << eventFlags_;
909 DestructorGuard dg(this);
911 sslState_ == STATE_CACHE_LOOKUP ||
912 sslState_ == STATE_RSA_ASYNC_PENDING ||
913 sslState_ == STATE_ERROR ||
914 sslState_ == STATE_CLOSED
916 if (sslState_ == STATE_CLOSED) {
917 // I sure hope whoever closed this socket didn't delete it already,
918 // but this is not strictly speaking an error
921 if (sslState_ == STATE_ERROR) {
922 // go straight to fail if timeout expired during lookup
923 AsyncSocketException ex(AsyncSocketException::TIMED_OUT,
924 "SSL accept timed out");
925 failHandshake(__func__, ex);
928 sslState_ = STATE_ACCEPTING;
929 this->handleAccept();
933 AsyncSSLSocket::handleAccept() noexcept {
934 VLOG(3) << "AsyncSSLSocket::handleAccept() this=" << this
935 << ", fd=" << fd_ << ", state=" << int(state_) << ", "
936 << "sslState=" << sslState_ << ", events=" << eventFlags_;
938 assert(state_ == StateEnum::ESTABLISHED &&
939 sslState_ == STATE_ACCEPTING);
941 /* lazily create the SSL structure */
943 ssl_ = ctx_->createSSL();
944 } catch (std::exception &e) {
945 sslState_ = STATE_ERROR;
946 AsyncSocketException ex(AsyncSocketException::INTERNAL_ERROR,
947 "error calling SSLContext::createSSL()");
948 LOG(ERROR) << "AsyncSSLSocket::handleAccept(this=" << this
949 << ", fd=" << fd_ << "): " << e.what();
950 return failHandshake(__func__, ex);
952 SSL_set_fd(ssl_, fd_);
953 SSL_set_ex_data(ssl_, getSSLExDataIndex(), this);
955 applyVerificationOptions(ssl_);
958 if (server_ && parseClientHello_) {
959 SSL_set_msg_callback_arg(ssl_, this);
960 SSL_set_msg_callback(ssl_, &AsyncSSLSocket::clientHelloParsingCallback);
964 int ret = SSL_accept(ssl_);
967 if (willBlock(ret, &error)) {
970 sslState_ = STATE_ERROR;
971 SSLException ex(error, errno);
972 return failHandshake(__func__, ex);
976 handshakeComplete_ = true;
977 updateEventRegistration(0, EventHandler::READ | EventHandler::WRITE);
979 // Move into STATE_ESTABLISHED in the normal case that we are in
981 sslState_ = STATE_ESTABLISHED;
983 VLOG(3) << "AsyncSSLSocket " << this << ": fd " << fd_
984 << " successfully accepted; state=" << int(state_)
985 << ", sslState=" << sslState_ << ", events=" << eventFlags_;
987 // Remember the EventBase we are attached to, before we start invoking any
988 // callbacks (since the callbacks may call detachEventBase()).
989 EventBase* originalEventBase = eventBase_;
991 // Call the accept callback.
994 // Note that the accept callback may have changed our state.
995 // (set or unset the read callback, called write(), closed the socket, etc.)
996 // The following code needs to handle these situations correctly.
998 // If the socket has been closed, readCallback_ and writeReqHead_ will
999 // always be nullptr, so that will prevent us from trying to read or write.
1001 // The main thing to check for is if eventBase_ is still originalEventBase.
1002 // If not, we have been detached from this event base, so we shouldn't
1003 // perform any more operations.
1004 if (eventBase_ != originalEventBase) {
1008 AsyncSocket::handleInitialReadWrite();
1012 AsyncSSLSocket::handleConnect() noexcept {
1013 VLOG(3) << "AsyncSSLSocket::handleConnect() this=" << this
1014 << ", fd=" << fd_ << ", state=" << int(state_) << ", "
1015 << "sslState=" << sslState_ << ", events=" << eventFlags_;
1017 if (state_ < StateEnum::ESTABLISHED) {
1018 return AsyncSocket::handleConnect();
1021 assert(state_ == StateEnum::ESTABLISHED &&
1022 sslState_ == STATE_CONNECTING);
1026 int ret = SSL_connect(ssl_);
1029 if (willBlock(ret, &error)) {
1032 sslState_ = STATE_ERROR;
1033 SSLException ex(error, errno);
1034 return failHandshake(__func__, ex);
1038 handshakeComplete_ = true;
1039 updateEventRegistration(0, EventHandler::READ | EventHandler::WRITE);
1041 // Move into STATE_ESTABLISHED in the normal case that we are in
1042 // STATE_CONNECTING.
1043 sslState_ = STATE_ESTABLISHED;
1045 VLOG(3) << "AsyncSSLSocket %p: fd %d successfully connected; "
1046 << "state=" << int(state_) << ", sslState=" << sslState_
1047 << ", events=" << eventFlags_;
1049 // Remember the EventBase we are attached to, before we start invoking any
1050 // callbacks (since the callbacks may call detachEventBase()).
1051 EventBase* originalEventBase = eventBase_;
1053 // Call the handshake callback.
1054 invokeHandshakeCB();
1056 // Note that the connect callback may have changed our state.
1057 // (set or unset the read callback, called write(), closed the socket, etc.)
1058 // The following code needs to handle these situations correctly.
1060 // If the socket has been closed, readCallback_ and writeReqHead_ will
1061 // always be nullptr, so that will prevent us from trying to read or write.
1063 // The main thing to check for is if eventBase_ is still originalEventBase.
1064 // If not, we have been detached from this event base, so we shouldn't
1065 // perform any more operations.
1066 if (eventBase_ != originalEventBase) {
1070 AsyncSocket::handleInitialReadWrite();
1073 void AsyncSSLSocket::setReadCB(ReadCallback *callback) {
1074 #ifdef SSL_MODE_MOVE_BUFFER_OWNERSHIP
1075 // turn on the buffer movable in openssl
1076 if (!isBufferMovable_ && callback != nullptr && callback->isBufferMovable()) {
1077 SSL_set_mode(ssl_, SSL_get_mode(ssl_) | SSL_MODE_MOVE_BUFFER_OWNERSHIP);
1078 isBufferMovable_ = true;
1082 AsyncSocket::setReadCB(callback);
1085 void AsyncSSLSocket::prepareReadBuffer(void** buf, size_t* buflen) noexcept {
1086 CHECK(readCallback_);
1087 if (isBufferMovable_) {
1091 // buf is necessary for SSLSocket without SSL_MODE_MOVE_BUFFER_OWNERSHIP
1092 readCallback_->getReadBuffer(buf, buflen);
1097 AsyncSSLSocket::handleRead() noexcept {
1098 VLOG(5) << "AsyncSSLSocket::handleRead() this=" << this << ", fd=" << fd_
1099 << ", state=" << int(state_) << ", "
1100 << "sslState=" << sslState_ << ", events=" << eventFlags_;
1101 if (state_ < StateEnum::ESTABLISHED) {
1102 return AsyncSocket::handleRead();
1106 if (sslState_ == STATE_ACCEPTING) {
1111 else if (sslState_ == STATE_CONNECTING) {
1118 AsyncSocket::handleRead();
1122 AsyncSSLSocket::performRead(void** buf, size_t* buflen, size_t* offset) {
1123 VLOG(4) << "AsyncSSLSocket::performRead() this=" << this
1124 << ", buf=" << *buf << ", buflen=" << *buflen;
1126 if (sslState_ == STATE_UNENCRYPTED) {
1127 return AsyncSocket::performRead(buf, buflen, offset);
1132 if (!isBufferMovable_) {
1133 bytes = SSL_read(ssl_, *buf, *buflen);
1135 #ifdef SSL_MODE_MOVE_BUFFER_OWNERSHIP
1137 bytes = SSL_read_buf(ssl_, buf, (int *) offset, (int *) buflen);
1141 if (server_ && renegotiateAttempted_) {
1142 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1143 << ", sslstate=" << sslState_ << ", events=" << eventFlags_
1144 << "): client intitiated SSL renegotiation not permitted";
1145 // We pack our own SSLerr here with a dummy function
1146 errno = ERR_PACK(ERR_LIB_USER, TASYNCSSLSOCKET_F_PERFORM_READ,
1147 SSL_CLIENT_RENEGOTIATION_ATTEMPT);
1152 int error = SSL_get_error(ssl_, bytes);
1153 if (error == SSL_ERROR_WANT_READ) {
1154 // The caller will register for read event if not already.
1155 return READ_BLOCKING;
1156 } else if (error == SSL_ERROR_WANT_WRITE) {
1157 // TODO: Even though we are attempting to read data, SSL_read() may
1158 // need to write data if renegotiation is being performed. We currently
1159 // don't support this and just fail the read.
1160 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1161 << ", sslState=" << sslState_ << ", events=" << eventFlags_
1162 << "): unsupported SSL renegotiation during read",
1163 errno = ERR_PACK(ERR_LIB_USER, TASYNCSSLSOCKET_F_PERFORM_READ,
1164 SSL_INVALID_RENEGOTIATION);
1168 // TODO: Fix this code so that it can return a proper error message
1169 // to the callback, rather than relying on AsyncSocket code which
1170 // can't handle SSL errors.
1171 long lastError = ERR_get_error();
1173 VLOG(6) << "AsyncSSLSocket(fd=" << fd_ << ", "
1174 << "state=" << state_ << ", "
1175 << "sslState=" << sslState_ << ", "
1176 << "events=" << std::hex << eventFlags_ << "): "
1177 << "bytes: " << bytes << ", "
1178 << "error: " << error << ", "
1179 << "errno: " << errno << ", "
1180 << "func: " << ERR_func_error_string(lastError) << ", "
1181 << "reason: " << ERR_reason_error_string(lastError);
1183 if (zero_return(error, bytes)) {
1186 if (error != SSL_ERROR_SYSCALL) {
1187 if ((unsigned long)lastError < 0x8000) {
1196 appBytesReceived_ += bytes;
1201 void AsyncSSLSocket::handleWrite() noexcept {
1202 VLOG(5) << "AsyncSSLSocket::handleWrite() this=" << this << ", fd=" << fd_
1203 << ", state=" << int(state_) << ", "
1204 << "sslState=" << sslState_ << ", events=" << eventFlags_;
1205 if (state_ < StateEnum::ESTABLISHED) {
1206 return AsyncSocket::handleWrite();
1209 if (sslState_ == STATE_ACCEPTING) {
1215 if (sslState_ == STATE_CONNECTING) {
1222 AsyncSocket::handleWrite();
1225 int AsyncSSLSocket::interpretSSLError(int rc, int error) {
1226 if (error == SSL_ERROR_WANT_READ) {
1227 // TODO: Even though we are attempting to write data, SSL_write() may
1228 // need to read data if renegotiation is being performed. We currently
1229 // don't support this and just fail the write.
1230 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1231 << ", sslState=" << sslState_ << ", events=" << eventFlags_
1232 << "): " << "unsupported SSL renegotiation during write",
1233 errno = ERR_PACK(ERR_LIB_USER, TASYNCSSLSOCKET_F_PERFORM_WRITE,
1234 SSL_INVALID_RENEGOTIATION);
1238 // TODO: Fix this code so that it can return a proper error message
1239 // to the callback, rather than relying on AsyncSocket code which
1240 // can't handle SSL errors.
1241 long lastError = ERR_get_error();
1242 VLOG(3) << "ERROR: AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1243 << ", sslState=" << sslState_ << ", events=" << eventFlags_ << "): "
1244 << "SSL error: " << error << ", errno: " << errno
1245 << ", func: " << ERR_func_error_string(lastError)
1246 << ", reason: " << ERR_reason_error_string(lastError);
1247 if (error != SSL_ERROR_SYSCALL) {
1248 if ((unsigned long)lastError < 0x8000) {
1255 if (!zero_return(error, rc)) {
1263 ssize_t AsyncSSLSocket::performWrite(const iovec* vec,
1266 uint32_t* countWritten,
1267 uint32_t* partialWritten) {
1268 if (sslState_ == STATE_UNENCRYPTED) {
1269 return AsyncSocket::performWrite(
1270 vec, count, flags, countWritten, partialWritten);
1272 if (sslState_ != STATE_ESTABLISHED) {
1273 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1274 << ", sslState=" << sslState_
1275 << ", events=" << eventFlags_ << "): "
1276 << "TODO: AsyncSSLSocket currently does not support calling "
1277 << "write() before the handshake has fully completed";
1278 errno = ERR_PACK(ERR_LIB_USER, TASYNCSSLSOCKET_F_PERFORM_WRITE,
1283 bool cork = isSet(flags, WriteFlags::CORK);
1284 CorkGuard guard(fd_, count > 1, cork, &corked_);
1287 //#ifdef SSL_MODE_WRITE_IOVEC
1288 if (ssl_->expand == nullptr &&
1289 ssl_->compress == nullptr &&
1290 (ssl_->mode & SSL_MODE_WRITE_IOVEC)) {
1291 return performWriteIovec(vec, count, flags, countWritten, partialWritten);
1295 // Declare a buffer used to hold small write requests. It could point to a
1296 // memory block either on stack or on heap. If it is on heap, we release it
1297 // manually when scope exits
1298 char* combinedBuf{nullptr};
1300 // Note, always keep this check consistent with what we do below
1301 if (combinedBuf != nullptr && minWriteSize_ > MAX_STACK_BUF_SIZE) {
1302 delete[] combinedBuf;
1307 *partialWritten = 0;
1308 ssize_t totalWritten = 0;
1309 size_t bytesStolenFromNextBuffer = 0;
1310 for (uint32_t i = 0; i < count; i++) {
1311 const iovec* v = vec + i;
1312 size_t offset = bytesStolenFromNextBuffer;
1313 bytesStolenFromNextBuffer = 0;
1314 size_t len = v->iov_len - offset;
1320 buf = ((const char*)v->iov_base) + offset;
1324 uint32_t buffersStolen = 0;
1325 if ((len < minWriteSize_) && ((i + 1) < count)) {
1326 // Combine this buffer with part or all of the next buffers in
1327 // order to avoid really small-grained calls to SSL_write().
1328 // Each call to SSL_write() produces a separate record in
1329 // the egress SSL stream, and we've found that some low-end
1330 // mobile clients can't handle receiving an HTTP response
1331 // header and the first part of the response body in two
1332 // separate SSL records (even if those two records are in
1333 // the same TCP packet).
1335 if (combinedBuf == nullptr) {
1336 if (minWriteSize_ > MAX_STACK_BUF_SIZE) {
1337 // Allocate the buffer on heap
1338 combinedBuf = new char[minWriteSize_];
1340 // Allocate the buffer on stack
1341 combinedBuf = (char*)alloca(minWriteSize_);
1344 assert(combinedBuf != nullptr);
1346 memcpy(combinedBuf, buf, len);
1348 // INVARIANT: i + buffersStolen == complete chunks serialized
1349 uint32_t nextIndex = i + buffersStolen + 1;
1350 bytesStolenFromNextBuffer = std::min(vec[nextIndex].iov_len,
1351 minWriteSize_ - len);
1352 memcpy(combinedBuf + len, vec[nextIndex].iov_base,
1353 bytesStolenFromNextBuffer);
1354 len += bytesStolenFromNextBuffer;
1355 if (bytesStolenFromNextBuffer < vec[nextIndex].iov_len) {
1356 // couldn't steal the whole buffer
1359 bytesStolenFromNextBuffer = 0;
1362 } while ((i + buffersStolen + 1) < count && (len < minWriteSize_));
1363 bytes = eorAwareSSLWrite(
1364 ssl_, combinedBuf, len,
1365 (isSet(flags, WriteFlags::EOR) && i + buffersStolen + 1 == count));
1368 bytes = eorAwareSSLWrite(ssl_, buf, len,
1369 (isSet(flags, WriteFlags::EOR) && i + 1 == count));
1373 int error = SSL_get_error(ssl_, bytes);
1374 if (error == SSL_ERROR_WANT_WRITE) {
1375 // The caller will register for write event if not already.
1376 *partialWritten = offset;
1377 return totalWritten;
1379 int rc = interpretSSLError(bytes, error);
1382 } // else fall through to below to correctly record totalWritten
1385 totalWritten += bytes;
1387 if (bytes == (ssize_t)len) {
1388 // The full iovec is written.
1389 (*countWritten) += 1 + buffersStolen;
1393 bytes += offset; // adjust bytes to account for all of v
1394 while (bytes >= (ssize_t)v->iov_len) {
1395 // We combined this buf with part or all of the next one, and
1396 // we managed to write all of this buf but not all of the bytes
1397 // from the next one that we'd hoped to write.
1398 bytes -= v->iov_len;
1402 *partialWritten = bytes;
1403 return totalWritten;
1407 return totalWritten;
1411 //#ifdef SSL_MODE_WRITE_IOVEC
1412 ssize_t AsyncSSLSocket::performWriteIovec(const iovec* vec,
1415 uint32_t* countWritten,
1416 uint32_t* partialWritten) {
1418 for (uint32_t j = 0; j < count; j++) {
1419 tot += vec[j].iov_len;
1422 ssize_t totalWritten = SSL_write_iovec(ssl_, vec, count);
1425 *partialWritten = 0;
1426 if (totalWritten <= 0) {
1427 return interpretSSLError(totalWritten, SSL_get_error(ssl_, totalWritten));
1429 ssize_t bytes = totalWritten, i = 0;
1430 while (i < count && bytes >= (ssize_t)vec[i].iov_len) {
1431 // we managed to write all of this buf
1432 bytes -= vec[i].iov_len;
1436 *partialWritten = bytes;
1438 VLOG(4) << "SSL_write_iovec() writes " << tot
1439 << ", returns " << totalWritten << " bytes"
1440 << ", max_send_fragment=" << ssl_->max_send_fragment
1441 << ", count=" << count << ", countWritten=" << *countWritten;
1443 return totalWritten;
1448 int AsyncSSLSocket::eorAwareSSLWrite(SSL *ssl, const void *buf, int n,
1450 if (eor && SSL_get_wbio(ssl)->method == &eorAwareBioMethod) {
1451 if (appEorByteNo_) {
1452 // cannot track for more than one app byte EOR
1453 CHECK(appEorByteNo_ == appBytesWritten_ + n);
1455 appEorByteNo_ = appBytesWritten_ + n;
1458 // 1. It is fine to keep updating minEorRawByteNo_.
1459 // 2. It is _min_ in the sense that SSL record will add some overhead.
1460 minEorRawByteNo_ = getRawBytesWritten() + n;
1463 n = sslWriteImpl(ssl, buf, n);
1465 appBytesWritten_ += n;
1466 if (appEorByteNo_) {
1467 if (getRawBytesWritten() >= minEorRawByteNo_) {
1468 minEorRawByteNo_ = 0;
1470 if(appBytesWritten_ == appEorByteNo_) {
1473 CHECK(appBytesWritten_ < appEorByteNo_);
1481 AsyncSSLSocket::sslInfoCallback(const SSL *ssl, int where, int ret) {
1482 AsyncSSLSocket *sslSocket = AsyncSSLSocket::getFromSSL(ssl);
1483 if (sslSocket->handshakeComplete_ && (where & SSL_CB_HANDSHAKE_START)) {
1484 sslSocket->renegotiateAttempted_ = true;
1488 int AsyncSSLSocket::eorAwareBioWrite(BIO *b, const char *in, int inl) {
1493 AsyncSSLSocket *tsslSock;
1495 iov.iov_base = const_cast<char *>(in);
1497 memset(&msg, 0, sizeof(msg));
1502 reinterpret_cast<AsyncSSLSocket*>(BIO_get_app_data(b));
1504 tsslSock->minEorRawByteNo_ &&
1505 tsslSock->minEorRawByteNo_ <= BIO_number_written(b) + inl) {
1510 ret = sendmsg(b->num, &msg, flags);
1511 BIO_clear_retry_flags(b);
1513 if (BIO_sock_should_retry(ret))
1514 BIO_set_retry_write(b);
1519 int AsyncSSLSocket::sslVerifyCallback(int preverifyOk,
1520 X509_STORE_CTX* x509Ctx) {
1521 SSL* ssl = (SSL*) X509_STORE_CTX_get_ex_data(
1522 x509Ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1523 AsyncSSLSocket* self = AsyncSSLSocket::getFromSSL(ssl);
1525 VLOG(3) << "AsyncSSLSocket::sslVerifyCallback() this=" << self << ", "
1526 << "fd=" << self->fd_ << ", preverifyOk=" << preverifyOk;
1527 return (self->handshakeCallback_) ?
1528 self->handshakeCallback_->handshakeVer(self, preverifyOk, x509Ctx) :
1532 void AsyncSSLSocket::enableClientHelloParsing() {
1533 parseClientHello_ = true;
1534 clientHelloInfo_.reset(new ClientHelloInfo());
1537 void AsyncSSLSocket::resetClientHelloParsing(SSL *ssl) {
1538 SSL_set_msg_callback(ssl, nullptr);
1539 SSL_set_msg_callback_arg(ssl, nullptr);
1540 clientHelloInfo_->clientHelloBuf_.clear();
1544 AsyncSSLSocket::clientHelloParsingCallback(int written, int version,
1545 int contentType, const void *buf, size_t len, SSL *ssl, void *arg)
1547 AsyncSSLSocket *sock = static_cast<AsyncSSLSocket*>(arg);
1549 sock->resetClientHelloParsing(ssl);
1552 if (contentType != SSL3_RT_HANDSHAKE) {
1553 sock->resetClientHelloParsing(ssl);
1560 auto& clientHelloBuf = sock->clientHelloInfo_->clientHelloBuf_;
1561 clientHelloBuf.append(IOBuf::wrapBuffer(buf, len));
1563 Cursor cursor(clientHelloBuf.front());
1564 if (cursor.read<uint8_t>() != SSL3_MT_CLIENT_HELLO) {
1565 sock->resetClientHelloParsing(ssl);
1569 if (cursor.totalLength() < 3) {
1570 clientHelloBuf.trimEnd(len);
1571 clientHelloBuf.append(IOBuf::copyBuffer(buf, len));
1575 uint32_t messageLength = cursor.read<uint8_t>();
1576 messageLength <<= 8;
1577 messageLength |= cursor.read<uint8_t>();
1578 messageLength <<= 8;
1579 messageLength |= cursor.read<uint8_t>();
1580 if (cursor.totalLength() < messageLength) {
1581 clientHelloBuf.trimEnd(len);
1582 clientHelloBuf.append(IOBuf::copyBuffer(buf, len));
1586 sock->clientHelloInfo_->clientHelloMajorVersion_ = cursor.read<uint8_t>();
1587 sock->clientHelloInfo_->clientHelloMinorVersion_ = cursor.read<uint8_t>();
1589 cursor.skip(4); // gmt_unix_time
1590 cursor.skip(28); // random_bytes
1592 cursor.skip(cursor.read<uint8_t>()); // session_id
1594 uint16_t cipherSuitesLength = cursor.readBE<uint16_t>();
1595 for (int i = 0; i < cipherSuitesLength; i += 2) {
1596 sock->clientHelloInfo_->
1597 clientHelloCipherSuites_.push_back(cursor.readBE<uint16_t>());
1600 uint8_t compressionMethodsLength = cursor.read<uint8_t>();
1601 for (int i = 0; i < compressionMethodsLength; ++i) {
1602 sock->clientHelloInfo_->
1603 clientHelloCompressionMethods_.push_back(cursor.readBE<uint8_t>());
1606 if (cursor.totalLength() > 0) {
1607 uint16_t extensionsLength = cursor.readBE<uint16_t>();
1608 while (extensionsLength) {
1609 sock->clientHelloInfo_->
1610 clientHelloExtensions_.push_back(cursor.readBE<uint16_t>());
1611 extensionsLength -= 2;
1612 uint16_t extensionDataLength = cursor.readBE<uint16_t>();
1613 extensionsLength -= 2;
1614 cursor.skip(extensionDataLength);
1615 extensionsLength -= extensionDataLength;
1618 } catch (std::out_of_range& e) {
1619 // we'll use what we found and cleanup below.
1620 VLOG(4) << "AsyncSSLSocket::clientHelloParsingCallback(): "
1621 << "buffer finished unexpectedly." << " AsyncSSLSocket socket=" << sock;
1624 sock->resetClientHelloParsing(ssl);