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::getSSLExDataIndex() {
611 static auto index = SSL_get_ex_new_index(
612 0, (void*)"AsyncSSLSocket data index", nullptr, nullptr, nullptr);
616 AsyncSSLSocket* AsyncSSLSocket::getFromSSL(const SSL *ssl) {
617 return static_cast<AsyncSSLSocket *>(SSL_get_ex_data(ssl,
618 getSSLExDataIndex()));
621 void AsyncSSLSocket::failHandshake(const char* fn,
622 const AsyncSocketException& ex) {
625 if (handshakeTimeout_.isScheduled()) {
626 handshakeTimeout_.cancelTimeout();
628 if (handshakeCallback_ != nullptr) {
629 HandshakeCB* callback = handshakeCallback_;
630 handshakeCallback_ = nullptr;
631 callback->handshakeErr(this, ex);
637 void AsyncSSLSocket::invokeHandshakeCB() {
638 if (handshakeTimeout_.isScheduled()) {
639 handshakeTimeout_.cancelTimeout();
641 if (handshakeCallback_) {
642 HandshakeCB* callback = handshakeCallback_;
643 handshakeCallback_ = nullptr;
644 callback->handshakeSuc(this);
648 void AsyncSSLSocket::connect(ConnectCallback* callback,
649 const folly::SocketAddress& address,
651 const OptionMap &options,
652 const folly::SocketAddress& bindAddr)
655 assert(state_ == StateEnum::UNINIT);
656 assert(sslState_ == STATE_UNINIT);
657 AsyncSSLSocketConnector *connector =
658 new AsyncSSLSocketConnector(this, callback, timeout);
659 AsyncSocket::connect(connector, address, timeout, options, bindAddr);
662 void AsyncSSLSocket::applyVerificationOptions(SSL * ssl) {
663 // apply the settings specified in verifyPeer_
664 if (verifyPeer_ == SSLContext::SSLVerifyPeerEnum::USE_CTX) {
665 if(ctx_->needsPeerVerification()) {
666 SSL_set_verify(ssl, ctx_->getVerificationMode(),
667 AsyncSSLSocket::sslVerifyCallback);
670 if (verifyPeer_ == SSLContext::SSLVerifyPeerEnum::VERIFY ||
671 verifyPeer_ == SSLContext::SSLVerifyPeerEnum::VERIFY_REQ_CLIENT_CERT) {
672 SSL_set_verify(ssl, SSLContext::getVerificationMode(verifyPeer_),
673 AsyncSSLSocket::sslVerifyCallback);
678 void AsyncSSLSocket::sslConn(HandshakeCB* callback, uint64_t timeout,
679 const SSLContext::SSLVerifyPeerEnum& verifyPeer) {
680 DestructorGuard dg(this);
681 assert(eventBase_->isInEventBaseThread());
683 verifyPeer_ = verifyPeer;
685 // Make sure we're in the uninitialized state
686 if (server_ || (sslState_ != STATE_UNINIT && sslState_ !=
687 STATE_UNENCRYPTED) ||
688 handshakeCallback_ != nullptr) {
689 return invalidState(callback);
692 sslState_ = STATE_CONNECTING;
693 handshakeCallback_ = callback;
696 ssl_ = ctx_->createSSL();
697 } catch (std::exception &e) {
698 sslState_ = STATE_ERROR;
699 AsyncSocketException ex(AsyncSocketException::INTERNAL_ERROR,
700 "error calling SSLContext::createSSL()");
701 LOG(ERROR) << "AsyncSSLSocket::sslConn(this=" << this << ", fd="
702 << fd_ << "): " << e.what();
703 return failHandshake(__func__, ex);
706 applyVerificationOptions(ssl_);
708 SSL_set_fd(ssl_, fd_);
709 if (sslSession_ != nullptr) {
710 SSL_set_session(ssl_, sslSession_);
711 SSL_SESSION_free(sslSession_);
712 sslSession_ = nullptr;
714 #if OPENSSL_VERSION_NUMBER >= 0x1000105fL && !defined(OPENSSL_NO_TLSEXT)
715 if (tlsextHostname_.size()) {
716 SSL_set_tlsext_host_name(ssl_, tlsextHostname_.c_str());
720 SSL_set_ex_data(ssl_, getSSLExDataIndex(), this);
723 handshakeTimeout_.scheduleTimeout(timeout);
729 SSL_SESSION *AsyncSSLSocket::getSSLSession() {
730 if (ssl_ != nullptr && sslState_ == STATE_ESTABLISHED) {
731 return SSL_get1_session(ssl_);
737 void AsyncSSLSocket::setSSLSession(SSL_SESSION *session, bool takeOwnership) {
738 sslSession_ = session;
739 if (!takeOwnership && session != nullptr) {
740 // Increment the reference count
741 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION);
745 void AsyncSSLSocket::getSelectedNextProtocol(const unsigned char** protoName,
746 unsigned* protoLen) const {
747 if (!getSelectedNextProtocolNoThrow(protoName, protoLen)) {
748 throw AsyncSocketException(AsyncSocketException::NOT_SUPPORTED,
749 "NPN not supported");
753 bool AsyncSSLSocket::getSelectedNextProtocolNoThrow(
754 const unsigned char** protoName,
755 unsigned* protoLen) const {
756 *protoName = nullptr;
758 #ifdef OPENSSL_NPN_NEGOTIATED
759 SSL_get0_next_proto_negotiated(ssl_, protoName, protoLen);
766 bool AsyncSSLSocket::getSSLSessionReused() const {
767 if (ssl_ != nullptr && sslState_ == STATE_ESTABLISHED) {
768 return SSL_session_reused(ssl_);
773 const char *AsyncSSLSocket::getNegotiatedCipherName() const {
774 return (ssl_ != nullptr) ? SSL_get_cipher_name(ssl_) : nullptr;
777 const char *AsyncSSLSocket::getSSLServerName() const {
778 #ifdef SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
779 return (ssl_ != nullptr) ? SSL_get_servername(ssl_, TLSEXT_NAMETYPE_host_name)
782 throw AsyncSocketException(AsyncSocketException::NOT_SUPPORTED,
783 "SNI not supported");
787 const char *AsyncSSLSocket::getSSLServerNameNoThrow() const {
789 return getSSLServerName();
790 } catch (AsyncSocketException& ex) {
795 int AsyncSSLSocket::getSSLVersion() const {
796 return (ssl_ != nullptr) ? SSL_version(ssl_) : 0;
799 int AsyncSSLSocket::getSSLCertSize() const {
801 X509 *cert = (ssl_ != nullptr) ? SSL_get_certificate(ssl_) : nullptr;
803 EVP_PKEY *key = X509_get_pubkey(cert);
804 certSize = EVP_PKEY_bits(key);
810 bool AsyncSSLSocket::willBlock(int ret, int *errorOut) noexcept {
811 int error = *errorOut = SSL_get_error(ssl_, ret);
812 if (error == SSL_ERROR_WANT_READ) {
813 // Register for read event if not already.
814 updateEventRegistration(EventHandler::READ, EventHandler::WRITE);
816 } else if (error == SSL_ERROR_WANT_WRITE) {
817 VLOG(3) << "AsyncSSLSocket(fd=" << fd_
818 << ", state=" << int(state_) << ", sslState="
819 << sslState_ << ", events=" << eventFlags_ << "): "
820 << "SSL_ERROR_WANT_WRITE";
821 // Register for write event if not already.
822 updateEventRegistration(EventHandler::WRITE, EventHandler::READ);
824 #ifdef SSL_ERROR_WANT_SESS_CACHE_LOOKUP
825 } else if (error == SSL_ERROR_WANT_SESS_CACHE_LOOKUP) {
826 // We will block but we can't register our own socket. The callback that
827 // triggered this code will re-call handleAccept at the appropriate time.
829 // We can only get here if the linked libssl.so has support for this feature
830 // as well, otherwise SSL_get_error cannot return our error code.
831 sslState_ = STATE_CACHE_LOOKUP;
833 // Unregister for all events while blocked here
834 updateEventRegistration(EventHandler::NONE,
835 EventHandler::READ | EventHandler::WRITE);
837 // The timeout (if set) keeps running here
840 #ifdef SSL_ERROR_WANT_RSA_ASYNC_PENDING
841 } else if (error == SSL_ERROR_WANT_RSA_ASYNC_PENDING) {
842 // Our custom openssl function has kicked off an async request to do
843 // modular exponentiation. When that call returns, a callback will
844 // be invoked that will re-call handleAccept.
845 sslState_ = STATE_RSA_ASYNC_PENDING;
847 // Unregister for all events while blocked here
848 updateEventRegistration(
850 EventHandler::READ | EventHandler::WRITE
853 // The timeout (if set) keeps running here
857 // SSL_ERROR_ZERO_RETURN is processed here so we can get some detail
859 long lastError = ERR_get_error();
860 VLOG(6) << "AsyncSSLSocket(fd=" << fd_ << ", "
861 << "state=" << state_ << ", "
862 << "sslState=" << sslState_ << ", "
863 << "events=" << std::hex << eventFlags_ << "): "
864 << "SSL error: " << error << ", "
865 << "errno: " << errno << ", "
866 << "ret: " << ret << ", "
867 << "read: " << BIO_number_read(SSL_get_rbio(ssl_)) << ", "
868 << "written: " << BIO_number_written(SSL_get_wbio(ssl_)) << ", "
869 << "func: " << ERR_func_error_string(lastError) << ", "
870 << "reason: " << ERR_reason_error_string(lastError);
871 if (error != SSL_ERROR_SYSCALL) {
872 if (error == SSL_ERROR_SSL) {
873 *errorOut = lastError;
875 if ((unsigned long)lastError < 0x8000) {
886 void AsyncSSLSocket::checkForImmediateRead() noexcept {
887 // openssl may have buffered data that it read from the socket already.
888 // In this case we have to process it immediately, rather than waiting for
889 // the socket to become readable again.
890 if (ssl_ != nullptr && SSL_pending(ssl_) > 0) {
891 AsyncSocket::handleRead();
896 AsyncSSLSocket::restartSSLAccept()
898 VLOG(3) << "AsyncSSLSocket::restartSSLAccept() this=" << this << ", fd=" << fd_
899 << ", state=" << int(state_) << ", "
900 << "sslState=" << sslState_ << ", events=" << eventFlags_;
901 DestructorGuard dg(this);
903 sslState_ == STATE_CACHE_LOOKUP ||
904 sslState_ == STATE_RSA_ASYNC_PENDING ||
905 sslState_ == STATE_ERROR ||
906 sslState_ == STATE_CLOSED
908 if (sslState_ == STATE_CLOSED) {
909 // I sure hope whoever closed this socket didn't delete it already,
910 // but this is not strictly speaking an error
913 if (sslState_ == STATE_ERROR) {
914 // go straight to fail if timeout expired during lookup
915 AsyncSocketException ex(AsyncSocketException::TIMED_OUT,
916 "SSL accept timed out");
917 failHandshake(__func__, ex);
920 sslState_ = STATE_ACCEPTING;
921 this->handleAccept();
925 AsyncSSLSocket::handleAccept() noexcept {
926 VLOG(3) << "AsyncSSLSocket::handleAccept() this=" << this
927 << ", fd=" << fd_ << ", state=" << int(state_) << ", "
928 << "sslState=" << sslState_ << ", events=" << eventFlags_;
930 assert(state_ == StateEnum::ESTABLISHED &&
931 sslState_ == STATE_ACCEPTING);
933 /* lazily create the SSL structure */
935 ssl_ = ctx_->createSSL();
936 } catch (std::exception &e) {
937 sslState_ = STATE_ERROR;
938 AsyncSocketException ex(AsyncSocketException::INTERNAL_ERROR,
939 "error calling SSLContext::createSSL()");
940 LOG(ERROR) << "AsyncSSLSocket::handleAccept(this=" << this
941 << ", fd=" << fd_ << "): " << e.what();
942 return failHandshake(__func__, ex);
944 SSL_set_fd(ssl_, fd_);
945 SSL_set_ex_data(ssl_, getSSLExDataIndex(), this);
947 applyVerificationOptions(ssl_);
950 if (server_ && parseClientHello_) {
951 SSL_set_msg_callback_arg(ssl_, this);
952 SSL_set_msg_callback(ssl_, &AsyncSSLSocket::clientHelloParsingCallback);
956 int ret = SSL_accept(ssl_);
959 if (willBlock(ret, &error)) {
962 sslState_ = STATE_ERROR;
963 SSLException ex(error, errno);
964 return failHandshake(__func__, ex);
968 handshakeComplete_ = true;
969 updateEventRegistration(0, EventHandler::READ | EventHandler::WRITE);
971 // Move into STATE_ESTABLISHED in the normal case that we are in
973 sslState_ = STATE_ESTABLISHED;
975 VLOG(3) << "AsyncSSLSocket " << this << ": fd " << fd_
976 << " successfully accepted; state=" << int(state_)
977 << ", sslState=" << sslState_ << ", events=" << eventFlags_;
979 // Remember the EventBase we are attached to, before we start invoking any
980 // callbacks (since the callbacks may call detachEventBase()).
981 EventBase* originalEventBase = eventBase_;
983 // Call the accept callback.
986 // Note that the accept callback may have changed our state.
987 // (set or unset the read callback, called write(), closed the socket, etc.)
988 // The following code needs to handle these situations correctly.
990 // If the socket has been closed, readCallback_ and writeReqHead_ will
991 // always be nullptr, so that will prevent us from trying to read or write.
993 // The main thing to check for is if eventBase_ is still originalEventBase.
994 // If not, we have been detached from this event base, so we shouldn't
995 // perform any more operations.
996 if (eventBase_ != originalEventBase) {
1000 AsyncSocket::handleInitialReadWrite();
1004 AsyncSSLSocket::handleConnect() noexcept {
1005 VLOG(3) << "AsyncSSLSocket::handleConnect() this=" << this
1006 << ", fd=" << fd_ << ", state=" << int(state_) << ", "
1007 << "sslState=" << sslState_ << ", events=" << eventFlags_;
1009 if (state_ < StateEnum::ESTABLISHED) {
1010 return AsyncSocket::handleConnect();
1013 assert(state_ == StateEnum::ESTABLISHED &&
1014 sslState_ == STATE_CONNECTING);
1018 int ret = SSL_connect(ssl_);
1021 if (willBlock(ret, &error)) {
1024 sslState_ = STATE_ERROR;
1025 SSLException ex(error, errno);
1026 return failHandshake(__func__, ex);
1030 handshakeComplete_ = true;
1031 updateEventRegistration(0, EventHandler::READ | EventHandler::WRITE);
1033 // Move into STATE_ESTABLISHED in the normal case that we are in
1034 // STATE_CONNECTING.
1035 sslState_ = STATE_ESTABLISHED;
1037 VLOG(3) << "AsyncSSLSocket %p: fd %d successfully connected; "
1038 << "state=" << int(state_) << ", sslState=" << sslState_
1039 << ", events=" << eventFlags_;
1041 // Remember the EventBase we are attached to, before we start invoking any
1042 // callbacks (since the callbacks may call detachEventBase()).
1043 EventBase* originalEventBase = eventBase_;
1045 // Call the handshake callback.
1046 invokeHandshakeCB();
1048 // Note that the connect callback may have changed our state.
1049 // (set or unset the read callback, called write(), closed the socket, etc.)
1050 // The following code needs to handle these situations correctly.
1052 // If the socket has been closed, readCallback_ and writeReqHead_ will
1053 // always be nullptr, so that will prevent us from trying to read or write.
1055 // The main thing to check for is if eventBase_ is still originalEventBase.
1056 // If not, we have been detached from this event base, so we shouldn't
1057 // perform any more operations.
1058 if (eventBase_ != originalEventBase) {
1062 AsyncSocket::handleInitialReadWrite();
1065 void AsyncSSLSocket::setReadCB(ReadCallback *callback) {
1066 #ifdef SSL_MODE_MOVE_BUFFER_OWNERSHIP
1067 // turn on the buffer movable in openssl
1068 if (!isBufferMovable_ && callback != nullptr && callback->isBufferMovable()) {
1069 SSL_set_mode(ssl_, SSL_get_mode(ssl_) | SSL_MODE_MOVE_BUFFER_OWNERSHIP);
1070 isBufferMovable_ = true;
1074 AsyncSocket::setReadCB(callback);
1077 void AsyncSSLSocket::prepareReadBuffer(void** buf, size_t* buflen) noexcept {
1078 CHECK(readCallback_);
1079 if (isBufferMovable_) {
1083 // buf is necessary for SSLSocket without SSL_MODE_MOVE_BUFFER_OWNERSHIP
1084 readCallback_->getReadBuffer(buf, buflen);
1089 AsyncSSLSocket::handleRead() noexcept {
1090 VLOG(5) << "AsyncSSLSocket::handleRead() this=" << this << ", fd=" << fd_
1091 << ", state=" << int(state_) << ", "
1092 << "sslState=" << sslState_ << ", events=" << eventFlags_;
1093 if (state_ < StateEnum::ESTABLISHED) {
1094 return AsyncSocket::handleRead();
1098 if (sslState_ == STATE_ACCEPTING) {
1103 else if (sslState_ == STATE_CONNECTING) {
1110 AsyncSocket::handleRead();
1114 AsyncSSLSocket::performRead(void** buf, size_t* buflen, size_t* offset) {
1115 VLOG(4) << "AsyncSSLSocket::performRead() this=" << this
1116 << ", buf=" << *buf << ", buflen=" << *buflen;
1118 if (sslState_ == STATE_UNENCRYPTED) {
1119 return AsyncSocket::performRead(buf, buflen, offset);
1124 if (!isBufferMovable_) {
1125 bytes = SSL_read(ssl_, *buf, *buflen);
1127 #ifdef SSL_MODE_MOVE_BUFFER_OWNERSHIP
1129 bytes = SSL_read_buf(ssl_, buf, (int *) offset, (int *) buflen);
1133 if (server_ && renegotiateAttempted_) {
1134 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1135 << ", sslstate=" << sslState_ << ", events=" << eventFlags_
1136 << "): client intitiated SSL renegotiation not permitted";
1137 // We pack our own SSLerr here with a dummy function
1138 errno = ERR_PACK(ERR_LIB_USER, TASYNCSSLSOCKET_F_PERFORM_READ,
1139 SSL_CLIENT_RENEGOTIATION_ATTEMPT);
1144 int error = SSL_get_error(ssl_, bytes);
1145 if (error == SSL_ERROR_WANT_READ) {
1146 // The caller will register for read event if not already.
1147 return READ_BLOCKING;
1148 } else if (error == SSL_ERROR_WANT_WRITE) {
1149 // TODO: Even though we are attempting to read data, SSL_read() may
1150 // need to write data if renegotiation is being performed. We currently
1151 // don't support this and just fail the read.
1152 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1153 << ", sslState=" << sslState_ << ", events=" << eventFlags_
1154 << "): unsupported SSL renegotiation during read",
1155 errno = ERR_PACK(ERR_LIB_USER, TASYNCSSLSOCKET_F_PERFORM_READ,
1156 SSL_INVALID_RENEGOTIATION);
1160 // TODO: Fix this code so that it can return a proper error message
1161 // to the callback, rather than relying on AsyncSocket code which
1162 // can't handle SSL errors.
1163 long lastError = ERR_get_error();
1165 VLOG(6) << "AsyncSSLSocket(fd=" << fd_ << ", "
1166 << "state=" << state_ << ", "
1167 << "sslState=" << sslState_ << ", "
1168 << "events=" << std::hex << eventFlags_ << "): "
1169 << "bytes: " << bytes << ", "
1170 << "error: " << error << ", "
1171 << "errno: " << errno << ", "
1172 << "func: " << ERR_func_error_string(lastError) << ", "
1173 << "reason: " << ERR_reason_error_string(lastError);
1175 if (zero_return(error, bytes)) {
1178 if (error != SSL_ERROR_SYSCALL) {
1179 if ((unsigned long)lastError < 0x8000) {
1188 appBytesReceived_ += bytes;
1193 void AsyncSSLSocket::handleWrite() noexcept {
1194 VLOG(5) << "AsyncSSLSocket::handleWrite() this=" << this << ", fd=" << fd_
1195 << ", state=" << int(state_) << ", "
1196 << "sslState=" << sslState_ << ", events=" << eventFlags_;
1197 if (state_ < StateEnum::ESTABLISHED) {
1198 return AsyncSocket::handleWrite();
1201 if (sslState_ == STATE_ACCEPTING) {
1207 if (sslState_ == STATE_CONNECTING) {
1214 AsyncSocket::handleWrite();
1217 int AsyncSSLSocket::interpretSSLError(int rc, int error) {
1218 if (error == SSL_ERROR_WANT_READ) {
1219 // TODO: Even though we are attempting to write data, SSL_write() may
1220 // need to read data if renegotiation is being performed. We currently
1221 // don't support this and just fail the write.
1222 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1223 << ", sslState=" << sslState_ << ", events=" << eventFlags_
1224 << "): " << "unsupported SSL renegotiation during write",
1225 errno = ERR_PACK(ERR_LIB_USER, TASYNCSSLSOCKET_F_PERFORM_WRITE,
1226 SSL_INVALID_RENEGOTIATION);
1230 // TODO: Fix this code so that it can return a proper error message
1231 // to the callback, rather than relying on AsyncSocket code which
1232 // can't handle SSL errors.
1233 long lastError = ERR_get_error();
1234 VLOG(3) << "ERROR: AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1235 << ", sslState=" << sslState_ << ", events=" << eventFlags_ << "): "
1236 << "SSL error: " << error << ", errno: " << errno
1237 << ", func: " << ERR_func_error_string(lastError)
1238 << ", reason: " << ERR_reason_error_string(lastError);
1239 if (error != SSL_ERROR_SYSCALL) {
1240 if ((unsigned long)lastError < 0x8000) {
1247 if (!zero_return(error, rc)) {
1255 ssize_t AsyncSSLSocket::performWrite(const iovec* vec,
1258 uint32_t* countWritten,
1259 uint32_t* partialWritten) {
1260 if (sslState_ == STATE_UNENCRYPTED) {
1261 return AsyncSocket::performWrite(
1262 vec, count, flags, countWritten, partialWritten);
1264 if (sslState_ != STATE_ESTABLISHED) {
1265 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1266 << ", sslState=" << sslState_
1267 << ", events=" << eventFlags_ << "): "
1268 << "TODO: AsyncSSLSocket currently does not support calling "
1269 << "write() before the handshake has fully completed";
1270 errno = ERR_PACK(ERR_LIB_USER, TASYNCSSLSOCKET_F_PERFORM_WRITE,
1275 bool cork = isSet(flags, WriteFlags::CORK);
1276 CorkGuard guard(fd_, count > 1, cork, &corked_);
1279 //#ifdef SSL_MODE_WRITE_IOVEC
1280 if (ssl_->expand == nullptr &&
1281 ssl_->compress == nullptr &&
1282 (ssl_->mode & SSL_MODE_WRITE_IOVEC)) {
1283 return performWriteIovec(vec, count, flags, countWritten, partialWritten);
1287 // Declare a buffer used to hold small write requests. It could point to a
1288 // memory block either on stack or on heap. If it is on heap, we release it
1289 // manually when scope exits
1290 char* combinedBuf{nullptr};
1292 // Note, always keep this check consistent with what we do below
1293 if (combinedBuf != nullptr && minWriteSize_ > MAX_STACK_BUF_SIZE) {
1294 delete[] combinedBuf;
1299 *partialWritten = 0;
1300 ssize_t totalWritten = 0;
1301 size_t bytesStolenFromNextBuffer = 0;
1302 for (uint32_t i = 0; i < count; i++) {
1303 const iovec* v = vec + i;
1304 size_t offset = bytesStolenFromNextBuffer;
1305 bytesStolenFromNextBuffer = 0;
1306 size_t len = v->iov_len - offset;
1312 buf = ((const char*)v->iov_base) + offset;
1316 uint32_t buffersStolen = 0;
1317 if ((len < minWriteSize_) && ((i + 1) < count)) {
1318 // Combine this buffer with part or all of the next buffers in
1319 // order to avoid really small-grained calls to SSL_write().
1320 // Each call to SSL_write() produces a separate record in
1321 // the egress SSL stream, and we've found that some low-end
1322 // mobile clients can't handle receiving an HTTP response
1323 // header and the first part of the response body in two
1324 // separate SSL records (even if those two records are in
1325 // the same TCP packet).
1327 if (combinedBuf == nullptr) {
1328 if (minWriteSize_ > MAX_STACK_BUF_SIZE) {
1329 // Allocate the buffer on heap
1330 combinedBuf = new char[minWriteSize_];
1332 // Allocate the buffer on stack
1333 combinedBuf = (char*)alloca(minWriteSize_);
1336 assert(combinedBuf != nullptr);
1338 memcpy(combinedBuf, buf, len);
1340 // INVARIANT: i + buffersStolen == complete chunks serialized
1341 uint32_t nextIndex = i + buffersStolen + 1;
1342 bytesStolenFromNextBuffer = std::min(vec[nextIndex].iov_len,
1343 minWriteSize_ - len);
1344 memcpy(combinedBuf + len, vec[nextIndex].iov_base,
1345 bytesStolenFromNextBuffer);
1346 len += bytesStolenFromNextBuffer;
1347 if (bytesStolenFromNextBuffer < vec[nextIndex].iov_len) {
1348 // couldn't steal the whole buffer
1351 bytesStolenFromNextBuffer = 0;
1354 } while ((i + buffersStolen + 1) < count && (len < minWriteSize_));
1355 bytes = eorAwareSSLWrite(
1356 ssl_, combinedBuf, len,
1357 (isSet(flags, WriteFlags::EOR) && i + buffersStolen + 1 == count));
1360 bytes = eorAwareSSLWrite(ssl_, buf, len,
1361 (isSet(flags, WriteFlags::EOR) && i + 1 == count));
1365 int error = SSL_get_error(ssl_, bytes);
1366 if (error == SSL_ERROR_WANT_WRITE) {
1367 // The caller will register for write event if not already.
1368 *partialWritten = offset;
1369 return totalWritten;
1371 int rc = interpretSSLError(bytes, error);
1374 } // else fall through to below to correctly record totalWritten
1377 totalWritten += bytes;
1379 if (bytes == (ssize_t)len) {
1380 // The full iovec is written.
1381 (*countWritten) += 1 + buffersStolen;
1385 bytes += offset; // adjust bytes to account for all of v
1386 while (bytes >= (ssize_t)v->iov_len) {
1387 // We combined this buf with part or all of the next one, and
1388 // we managed to write all of this buf but not all of the bytes
1389 // from the next one that we'd hoped to write.
1390 bytes -= v->iov_len;
1394 *partialWritten = bytes;
1395 return totalWritten;
1399 return totalWritten;
1403 //#ifdef SSL_MODE_WRITE_IOVEC
1404 ssize_t AsyncSSLSocket::performWriteIovec(const iovec* vec,
1407 uint32_t* countWritten,
1408 uint32_t* partialWritten) {
1410 for (uint32_t j = 0; j < count; j++) {
1411 tot += vec[j].iov_len;
1414 ssize_t totalWritten = SSL_write_iovec(ssl_, vec, count);
1417 *partialWritten = 0;
1418 if (totalWritten <= 0) {
1419 return interpretSSLError(totalWritten, SSL_get_error(ssl_, totalWritten));
1421 ssize_t bytes = totalWritten, i = 0;
1422 while (i < count && bytes >= (ssize_t)vec[i].iov_len) {
1423 // we managed to write all of this buf
1424 bytes -= vec[i].iov_len;
1428 *partialWritten = bytes;
1430 VLOG(4) << "SSL_write_iovec() writes " << tot
1431 << ", returns " << totalWritten << " bytes"
1432 << ", max_send_fragment=" << ssl_->max_send_fragment
1433 << ", count=" << count << ", countWritten=" << *countWritten;
1435 return totalWritten;
1440 int AsyncSSLSocket::eorAwareSSLWrite(SSL *ssl, const void *buf, int n,
1442 if (eor && SSL_get_wbio(ssl)->method == &eorAwareBioMethod) {
1443 if (appEorByteNo_) {
1444 // cannot track for more than one app byte EOR
1445 CHECK(appEorByteNo_ == appBytesWritten_ + n);
1447 appEorByteNo_ = appBytesWritten_ + n;
1450 // 1. It is fine to keep updating minEorRawByteNo_.
1451 // 2. It is _min_ in the sense that SSL record will add some overhead.
1452 minEorRawByteNo_ = getRawBytesWritten() + n;
1455 n = sslWriteImpl(ssl, buf, n);
1457 appBytesWritten_ += n;
1458 if (appEorByteNo_) {
1459 if (getRawBytesWritten() >= minEorRawByteNo_) {
1460 minEorRawByteNo_ = 0;
1462 if(appBytesWritten_ == appEorByteNo_) {
1465 CHECK(appBytesWritten_ < appEorByteNo_);
1473 AsyncSSLSocket::sslInfoCallback(const SSL *ssl, int where, int ret) {
1474 AsyncSSLSocket *sslSocket = AsyncSSLSocket::getFromSSL(ssl);
1475 if (sslSocket->handshakeComplete_ && (where & SSL_CB_HANDSHAKE_START)) {
1476 sslSocket->renegotiateAttempted_ = true;
1480 int AsyncSSLSocket::eorAwareBioWrite(BIO *b, const char *in, int inl) {
1485 AsyncSSLSocket *tsslSock;
1487 iov.iov_base = const_cast<char *>(in);
1489 memset(&msg, 0, sizeof(msg));
1494 reinterpret_cast<AsyncSSLSocket*>(BIO_get_app_data(b));
1496 tsslSock->minEorRawByteNo_ &&
1497 tsslSock->minEorRawByteNo_ <= BIO_number_written(b) + inl) {
1502 ret = sendmsg(b->num, &msg, flags);
1503 BIO_clear_retry_flags(b);
1505 if (BIO_sock_should_retry(ret))
1506 BIO_set_retry_write(b);
1511 int AsyncSSLSocket::sslVerifyCallback(int preverifyOk,
1512 X509_STORE_CTX* x509Ctx) {
1513 SSL* ssl = (SSL*) X509_STORE_CTX_get_ex_data(
1514 x509Ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1515 AsyncSSLSocket* self = AsyncSSLSocket::getFromSSL(ssl);
1517 VLOG(3) << "AsyncSSLSocket::sslVerifyCallback() this=" << self << ", "
1518 << "fd=" << self->fd_ << ", preverifyOk=" << preverifyOk;
1519 return (self->handshakeCallback_) ?
1520 self->handshakeCallback_->handshakeVer(self, preverifyOk, x509Ctx) :
1524 void AsyncSSLSocket::enableClientHelloParsing() {
1525 parseClientHello_ = true;
1526 clientHelloInfo_.reset(new ClientHelloInfo());
1529 void AsyncSSLSocket::resetClientHelloParsing(SSL *ssl) {
1530 SSL_set_msg_callback(ssl, nullptr);
1531 SSL_set_msg_callback_arg(ssl, nullptr);
1532 clientHelloInfo_->clientHelloBuf_.clear();
1536 AsyncSSLSocket::clientHelloParsingCallback(int written, int version,
1537 int contentType, const void *buf, size_t len, SSL *ssl, void *arg)
1539 AsyncSSLSocket *sock = static_cast<AsyncSSLSocket*>(arg);
1541 sock->resetClientHelloParsing(ssl);
1544 if (contentType != SSL3_RT_HANDSHAKE) {
1545 sock->resetClientHelloParsing(ssl);
1552 auto& clientHelloBuf = sock->clientHelloInfo_->clientHelloBuf_;
1553 clientHelloBuf.append(IOBuf::wrapBuffer(buf, len));
1555 Cursor cursor(clientHelloBuf.front());
1556 if (cursor.read<uint8_t>() != SSL3_MT_CLIENT_HELLO) {
1557 sock->resetClientHelloParsing(ssl);
1561 if (cursor.totalLength() < 3) {
1562 clientHelloBuf.trimEnd(len);
1563 clientHelloBuf.append(IOBuf::copyBuffer(buf, len));
1567 uint32_t messageLength = cursor.read<uint8_t>();
1568 messageLength <<= 8;
1569 messageLength |= cursor.read<uint8_t>();
1570 messageLength <<= 8;
1571 messageLength |= cursor.read<uint8_t>();
1572 if (cursor.totalLength() < messageLength) {
1573 clientHelloBuf.trimEnd(len);
1574 clientHelloBuf.append(IOBuf::copyBuffer(buf, len));
1578 sock->clientHelloInfo_->clientHelloMajorVersion_ = cursor.read<uint8_t>();
1579 sock->clientHelloInfo_->clientHelloMinorVersion_ = cursor.read<uint8_t>();
1581 cursor.skip(4); // gmt_unix_time
1582 cursor.skip(28); // random_bytes
1584 cursor.skip(cursor.read<uint8_t>()); // session_id
1586 uint16_t cipherSuitesLength = cursor.readBE<uint16_t>();
1587 for (int i = 0; i < cipherSuitesLength; i += 2) {
1588 sock->clientHelloInfo_->
1589 clientHelloCipherSuites_.push_back(cursor.readBE<uint16_t>());
1592 uint8_t compressionMethodsLength = cursor.read<uint8_t>();
1593 for (int i = 0; i < compressionMethodsLength; ++i) {
1594 sock->clientHelloInfo_->
1595 clientHelloCompressionMethods_.push_back(cursor.readBE<uint8_t>());
1598 if (cursor.totalLength() > 0) {
1599 uint16_t extensionsLength = cursor.readBE<uint16_t>();
1600 while (extensionsLength) {
1601 TLSExtension extensionType = static_cast<TLSExtension>(
1602 cursor.readBE<uint16_t>());
1603 sock->clientHelloInfo_->
1604 clientHelloExtensions_.push_back(extensionType);
1605 extensionsLength -= 2;
1606 uint16_t extensionDataLength = cursor.readBE<uint16_t>();
1607 extensionsLength -= 2;
1609 if (extensionType == TLSExtension::SIGNATURE_ALGORITHMS) {
1611 extensionDataLength -= 2;
1612 while (extensionDataLength) {
1613 HashAlgorithm hashAlg = static_cast<HashAlgorithm>(
1614 cursor.readBE<uint8_t>());
1615 SignatureAlgorithm sigAlg = static_cast<SignatureAlgorithm>(
1616 cursor.readBE<uint8_t>());
1617 extensionDataLength -= 2;
1618 sock->clientHelloInfo_->
1619 clientHelloSigAlgs_.emplace_back(hashAlg, sigAlg);
1622 cursor.skip(extensionDataLength);
1623 extensionsLength -= extensionDataLength;
1627 } catch (std::out_of_range& e) {
1628 // we'll use what we found and cleanup below.
1629 VLOG(4) << "AsyncSSLSocket::clientHelloParsingCallback(): "
1630 << "buffer finished unexpectedly." << " AsyncSSLSocket socket=" << sock;
1633 sock->resetClientHelloParsing(ssl);