2 * Copyright 2016 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>
20 #include <folly/portability/Sockets.h>
22 #include <boost/noncopyable.hpp>
25 #include <openssl/err.h>
26 #include <openssl/asn1.h>
27 #include <openssl/ssl.h>
28 #include <sys/types.h>
31 #include <folly/Bits.h>
32 #include <folly/SocketAddress.h>
33 #include <folly/SpinLock.h>
34 #include <folly/io/IOBuf.h>
35 #include <folly/io/Cursor.h>
36 #include <folly/portability/Unistd.h>
38 using folly::SocketAddress;
39 using folly::SSLContext;
41 using std::shared_ptr;
45 using folly::SpinLock;
46 using folly::SpinLockGuard;
47 using folly::io::Cursor;
48 using std::unique_ptr;
52 using folly::AsyncSocket;
53 using folly::AsyncSocketException;
54 using folly::AsyncSSLSocket;
55 using folly::Optional;
56 using folly::SSLContext;
57 using folly::ssl::OpenSSLUtils;
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 // If given min write size is less than this, buffer will be allocated on
65 // stack, otherwise it is allocated on heap
66 const size_t MAX_STACK_BUF_SIZE = 2048;
68 // This converts "illegal" shutdowns into ZERO_RETURN
69 inline bool zero_return(int error, int rc) {
70 return (error == SSL_ERROR_ZERO_RETURN || (rc == 0 && errno == 0));
73 class AsyncSSLSocketConnector: public AsyncSocket::ConnectCallback,
74 public AsyncSSLSocket::HandshakeCB {
77 AsyncSSLSocket *sslSocket_;
78 AsyncSSLSocket::ConnectCallback *callback_;
83 ~AsyncSSLSocketConnector() override {}
86 AsyncSSLSocketConnector(AsyncSSLSocket *sslSocket,
87 AsyncSocket::ConnectCallback *callback,
89 sslSocket_(sslSocket),
92 startTime_(std::chrono::duration_cast<std::chrono::milliseconds>(
93 std::chrono::steady_clock::now().time_since_epoch()).count()) {
96 void connectSuccess() noexcept override {
97 VLOG(7) << "client socket connected";
99 int64_t timeoutLeft = 0;
101 auto curTime = std::chrono::duration_cast<std::chrono::milliseconds>(
102 std::chrono::steady_clock::now().time_since_epoch()).count();
104 timeoutLeft = timeout_ - (curTime - startTime_);
105 if (timeoutLeft <= 0) {
106 AsyncSocketException ex(AsyncSocketException::TIMED_OUT,
107 "SSL connect timed out");
113 sslSocket_->sslConn(this, timeoutLeft);
116 void connectErr(const AsyncSocketException& ex) noexcept override {
117 VLOG(1) << "TCP connect failed: " << ex.what();
122 void handshakeSuc(AsyncSSLSocket* /* sock */) noexcept override {
123 VLOG(7) << "client handshake success";
125 callback_->connectSuccess();
130 void handshakeErr(AsyncSSLSocket* /* socket */,
131 const AsyncSocketException& ex) noexcept override {
132 VLOG(1) << "client handshakeErr: " << ex.what();
137 void fail(const AsyncSocketException &ex) {
138 // fail is a noop if called twice
140 AsyncSSLSocket::ConnectCallback *cb = callback_;
144 sslSocket_->closeNow();
145 // closeNow can call handshakeErr if it hasn't been called already.
146 // So this may have been deleted, no member variable access beyond this
148 // Note that closeNow may invoke writeError callbacks if the socket had
149 // write data pending connection completion.
154 // XXX: implement an equivalent to corking for platforms with TCP_NOPUSH?
155 #ifdef TCP_CORK // Linux-only
157 * Utility class that corks a TCP socket upon construction or uncorks
158 * the socket upon destruction
160 class CorkGuard : private boost::noncopyable {
162 CorkGuard(int fd, bool multipleWrites, bool haveMore, bool* corked):
163 fd_(fd), haveMore_(haveMore), corked_(corked) {
165 // socket is already corked; nothing to do
168 if (multipleWrites || haveMore) {
169 // We are performing multiple writes in this performWrite() call,
170 // and/or there are more calls to performWrite() that will be invoked
171 // later, so enable corking
173 setsockopt(fd_, IPPROTO_TCP, TCP_CORK, &flag, sizeof(flag));
180 // more data to come; don't uncork yet
184 // socket isn't corked; nothing to do
189 setsockopt(fd_, IPPROTO_TCP, TCP_CORK, &flag, sizeof(flag));
199 class CorkGuard : private boost::noncopyable {
201 CorkGuard(int, bool, bool, bool*) {}
205 void setup_SSL_CTX(SSL_CTX *ctx) {
206 #ifdef SSL_MODE_RELEASE_BUFFERS
207 SSL_CTX_set_mode(ctx,
208 SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
209 SSL_MODE_ENABLE_PARTIAL_WRITE
210 | SSL_MODE_RELEASE_BUFFERS
213 SSL_CTX_set_mode(ctx,
214 SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
215 SSL_MODE_ENABLE_PARTIAL_WRITE
218 // SSL_CTX_set_mode is a Macro
219 #ifdef SSL_MODE_WRITE_IOVEC
220 SSL_CTX_set_mode(ctx,
221 SSL_CTX_get_mode(ctx)
222 | SSL_MODE_WRITE_IOVEC);
227 BIO_METHOD sslWriteBioMethod;
229 void* initsslWriteBioMethod(void) {
230 memcpy(&sslWriteBioMethod, BIO_s_socket(), sizeof(sslWriteBioMethod));
231 // override the bwrite method for MSG_EOR support
232 OpenSSLUtils::setCustomBioWriteMethod(
233 &sslWriteBioMethod, AsyncSSLSocket::bioWrite);
235 // Note that the sslWriteBioMethod.type and sslWriteBioMethod.name are not
236 // set here. openssl code seems to be checking ".type == BIO_TYPE_SOCKET" and
237 // then have specific handlings. The sslWriteBioWrite should be compatible
238 // with the one in openssl.
240 // Return something here to enable AsyncSSLSocket to call this method using
241 // a function-scoped static.
245 } // anonymous namespace
250 * Create a client AsyncSSLSocket
252 AsyncSSLSocket::AsyncSSLSocket(const shared_ptr<SSLContext> &ctx,
253 EventBase* evb, bool deferSecurityNegotiation) :
256 handshakeTimeout_(this, evb),
257 connectionTimeout_(this, evb) {
259 if (deferSecurityNegotiation) {
260 sslState_ = STATE_UNENCRYPTED;
265 * Create a server/client AsyncSSLSocket
267 AsyncSSLSocket::AsyncSSLSocket(const shared_ptr<SSLContext>& ctx,
268 EventBase* evb, int fd, bool server,
269 bool deferSecurityNegotiation) :
270 AsyncSocket(evb, fd),
273 handshakeTimeout_(this, evb),
274 connectionTimeout_(this, evb) {
277 SSL_CTX_set_info_callback(ctx_->getSSLCtx(),
278 AsyncSSLSocket::sslInfoCallback);
280 if (deferSecurityNegotiation) {
281 sslState_ = STATE_UNENCRYPTED;
285 #if OPENSSL_VERSION_NUMBER >= 0x1000105fL && !defined(OPENSSL_NO_TLSEXT)
287 * Create a client AsyncSSLSocket and allow tlsext_hostname
288 * to be sent in Client Hello.
290 AsyncSSLSocket::AsyncSSLSocket(const shared_ptr<SSLContext> &ctx,
292 const std::string& serverName,
293 bool deferSecurityNegotiation) :
294 AsyncSSLSocket(ctx, evb, deferSecurityNegotiation) {
295 tlsextHostname_ = serverName;
299 * Create a client AsyncSSLSocket from an already connected fd
300 * and allow tlsext_hostname to be sent in Client Hello.
302 AsyncSSLSocket::AsyncSSLSocket(const shared_ptr<SSLContext>& ctx,
303 EventBase* evb, int fd,
304 const std::string& serverName,
305 bool deferSecurityNegotiation) :
306 AsyncSSLSocket(ctx, evb, fd, false, deferSecurityNegotiation) {
307 tlsextHostname_ = serverName;
311 AsyncSSLSocket::~AsyncSSLSocket() {
312 VLOG(3) << "actual destruction of AsyncSSLSocket(this=" << this
313 << ", evb=" << eventBase_ << ", fd=" << fd_
314 << ", state=" << int(state_) << ", sslState="
315 << sslState_ << ", events=" << eventFlags_ << ")";
318 void AsyncSSLSocket::init() {
319 // Do this here to ensure we initialize this once before any use of
320 // AsyncSSLSocket instances and not as part of library load.
321 static const auto sslWriteBioMethodInitializer = initsslWriteBioMethod();
322 (void)sslWriteBioMethodInitializer;
324 setup_SSL_CTX(ctx_->getSSLCtx());
327 void AsyncSSLSocket::closeNow() {
328 // Close the SSL connection.
329 if (ssl_ != nullptr && fd_ != -1) {
330 int rc = SSL_shutdown(ssl_);
332 rc = SSL_shutdown(ssl_);
339 if (sslSession_ != nullptr) {
340 SSL_SESSION_free(sslSession_);
341 sslSession_ = nullptr;
344 sslState_ = STATE_CLOSED;
346 if (handshakeTimeout_.isScheduled()) {
347 handshakeTimeout_.cancelTimeout();
350 DestructorGuard dg(this);
353 AsyncSocketException(
354 AsyncSocketException::END_OF_FILE,
355 "SSL connection closed locally"));
357 if (ssl_ != nullptr) {
363 AsyncSocket::closeNow();
366 void AsyncSSLSocket::shutdownWrite() {
367 // SSL sockets do not support half-shutdown, so just perform a full shutdown.
369 // (Performing a full shutdown here is more desirable than doing nothing at
370 // all. The purpose of shutdownWrite() is normally to notify the other end
371 // of the connection that no more data will be sent. If we do nothing, the
372 // other end will never know that no more data is coming, and this may result
373 // in protocol deadlock.)
377 void AsyncSSLSocket::shutdownWriteNow() {
381 bool AsyncSSLSocket::good() const {
382 return (AsyncSocket::good() &&
383 (sslState_ == STATE_ACCEPTING || sslState_ == STATE_CONNECTING ||
384 sslState_ == STATE_ESTABLISHED || sslState_ == STATE_UNENCRYPTED));
387 // The TAsyncTransport definition of 'good' states that the transport is
388 // ready to perform reads and writes, so sslState_ == UNINIT must report !good.
389 // connecting can be true when the sslState_ == UNINIT because the AsyncSocket
390 // is connected but we haven't initiated the call to SSL_connect.
391 bool AsyncSSLSocket::connecting() const {
393 (AsyncSocket::connecting() ||
394 (AsyncSocket::good() && (sslState_ == STATE_UNINIT ||
395 sslState_ == STATE_CONNECTING))));
398 std::string AsyncSSLSocket::getApplicationProtocol() noexcept {
399 const unsigned char* protoName = nullptr;
400 unsigned protoLength;
401 if (getSelectedNextProtocolNoThrow(&protoName, &protoLength)) {
402 return std::string(reinterpret_cast<const char*>(protoName), protoLength);
407 bool AsyncSSLSocket::isEorTrackingEnabled() const {
411 void AsyncSSLSocket::setEorTracking(bool track) {
412 if (trackEor_ != track) {
415 minEorRawByteNo_ = 0;
419 size_t AsyncSSLSocket::getRawBytesWritten() const {
420 // The bio(s) in the write path are in a chain
421 // each bio flushes to the next and finally written into the socket
422 // to get the rawBytesWritten on the socket,
423 // get the write bytes of the last bio
425 if (!ssl_ || !(b = SSL_get_wbio(ssl_))) {
428 BIO* next = BIO_next(b);
429 while (next != NULL) {
434 return BIO_number_written(b);
437 size_t AsyncSSLSocket::getRawBytesReceived() const {
439 if (!ssl_ || !(b = SSL_get_rbio(ssl_))) {
443 return BIO_number_read(b);
447 void AsyncSSLSocket::invalidState(HandshakeCB* callback) {
448 LOG(ERROR) << "AsyncSSLSocket(this=" << this << ", fd=" << fd_
449 << ", state=" << int(state_) << ", sslState=" << sslState_ << ", "
450 << "events=" << eventFlags_ << ", server=" << short(server_)
451 << "): " << "sslAccept/Connect() called in invalid "
452 << "state, handshake callback " << handshakeCallback_
453 << ", new callback " << callback;
454 assert(!handshakeTimeout_.isScheduled());
455 sslState_ = STATE_ERROR;
457 AsyncSocketException ex(AsyncSocketException::INVALID_STATE,
458 "sslAccept() called with socket in invalid state");
460 handshakeEndTime_ = std::chrono::steady_clock::now();
462 callback->handshakeErr(this, ex);
465 // Check the socket state not the ssl state here.
466 if (state_ != StateEnum::CLOSED || state_ != StateEnum::ERROR) {
467 failHandshake(__func__, ex);
471 void AsyncSSLSocket::sslAccept(HandshakeCB* callback, uint32_t timeout,
472 const SSLContext::SSLVerifyPeerEnum& verifyPeer) {
473 DestructorGuard dg(this);
474 assert(eventBase_->isInEventBaseThread());
475 verifyPeer_ = verifyPeer;
477 // Make sure we're in the uninitialized state
478 if (!server_ || (sslState_ != STATE_UNINIT &&
479 sslState_ != STATE_UNENCRYPTED) ||
480 handshakeCallback_ != nullptr) {
481 return invalidState(callback);
484 // Cache local and remote socket addresses to keep them available
485 // after socket file descriptor is closed.
486 if (cacheAddrOnFailure_ && -1 != getFd()) {
487 cacheLocalPeerAddr();
490 handshakeStartTime_ = std::chrono::steady_clock::now();
491 // Make end time at least >= start time.
492 handshakeEndTime_ = handshakeStartTime_;
494 sslState_ = STATE_ACCEPTING;
495 handshakeCallback_ = callback;
498 handshakeTimeout_.scheduleTimeout(timeout);
501 /* register for a read operation (waiting for CLIENT HELLO) */
502 updateEventRegistration(EventHandler::READ, EventHandler::WRITE);
505 #if OPENSSL_VERSION_NUMBER >= 0x009080bfL
506 void AsyncSSLSocket::attachSSLContext(
507 const std::shared_ptr<SSLContext>& ctx) {
509 // Check to ensure we are in client mode. Changing a server's ssl
510 // context doesn't make sense since clients of that server would likely
511 // become confused when the server's context changes.
515 DCHECK(ctx->getSSLCtx());
518 // In order to call attachSSLContext, detachSSLContext must have been
519 // previously called which sets the socket's context to the dummy
520 // context. Thus we must acquire this lock.
521 SpinLockGuard guard(dummyCtxLock);
522 SSL_set_SSL_CTX(ssl_, ctx->getSSLCtx());
525 void AsyncSSLSocket::detachSSLContext() {
528 // We aren't using the initial_ctx for now, and it can introduce race
529 // conditions in the destructor of the SSL object.
530 #ifndef OPENSSL_NO_TLSEXT
531 if (ssl_->initial_ctx) {
532 SSL_CTX_free(ssl_->initial_ctx);
533 ssl_->initial_ctx = nullptr;
536 SpinLockGuard guard(dummyCtxLock);
537 if (nullptr == dummyCtx) {
538 // We need to lazily initialize the dummy context so we don't
539 // accidentally override any programmatic settings to openssl
540 dummyCtx = new SSLContext;
542 // We must remove this socket's references to its context right now
543 // since this socket could get passed to any thread. If the context has
544 // had its locking disabled, just doing a set in attachSSLContext()
545 // would not be thread safe.
546 SSL_set_SSL_CTX(ssl_, dummyCtx->getSSLCtx());
550 #if OPENSSL_VERSION_NUMBER >= 0x1000105fL && !defined(OPENSSL_NO_TLSEXT)
551 void AsyncSSLSocket::switchServerSSLContext(
552 const std::shared_ptr<SSLContext>& handshakeCtx) {
554 if (sslState_ != STATE_ACCEPTING) {
555 // We log it here and allow the switch.
556 // It should not affect our re-negotiation support (which
557 // is not supported now).
558 VLOG(6) << "fd=" << getFd()
559 << " renegotation detected when switching SSL_CTX";
562 setup_SSL_CTX(handshakeCtx->getSSLCtx());
563 SSL_CTX_set_info_callback(handshakeCtx->getSSLCtx(),
564 AsyncSSLSocket::sslInfoCallback);
565 handshakeCtx_ = handshakeCtx;
566 SSL_set_SSL_CTX(ssl_, handshakeCtx->getSSLCtx());
569 bool AsyncSSLSocket::isServerNameMatch() const {
576 SSL_SESSION *ss = SSL_get_session(ssl_);
581 if(!ss->tlsext_hostname) {
584 return (tlsextHostname_.compare(ss->tlsext_hostname) ? false : true);
587 void AsyncSSLSocket::setServerName(std::string serverName) noexcept {
588 tlsextHostname_ = std::move(serverName);
593 void AsyncSSLSocket::timeoutExpired() noexcept {
594 if (state_ == StateEnum::ESTABLISHED &&
595 (sslState_ == STATE_CACHE_LOOKUP ||
596 sslState_ == STATE_ASYNC_PENDING)) {
597 sslState_ = STATE_ERROR;
598 // We are expecting a callback in restartSSLAccept. The cache lookup
599 // and rsa-call necessarily have pointers to this ssl socket, so delay
600 // the cleanup until he calls us back.
601 } else if (state_ == StateEnum::CONNECTING) {
602 assert(sslState_ == STATE_CONNECTING);
603 DestructorGuard dg(this);
604 AsyncSocketException ex(AsyncSocketException::TIMED_OUT,
605 "Fallback connect timed out during TFO");
606 failHandshake(__func__, ex);
608 assert(state_ == StateEnum::ESTABLISHED &&
609 (sslState_ == STATE_CONNECTING || sslState_ == STATE_ACCEPTING));
610 DestructorGuard dg(this);
611 AsyncSocketException ex(AsyncSocketException::TIMED_OUT,
612 (sslState_ == STATE_CONNECTING) ?
613 "SSL connect timed out" : "SSL accept timed out");
614 failHandshake(__func__, ex);
618 int AsyncSSLSocket::getSSLExDataIndex() {
619 static auto index = SSL_get_ex_new_index(
620 0, (void*)"AsyncSSLSocket data index", nullptr, nullptr, nullptr);
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) {
632 if (handshakeTimeout_.isScheduled()) {
633 handshakeTimeout_.cancelTimeout();
635 invokeHandshakeErr(ex);
639 void AsyncSSLSocket::invokeHandshakeErr(const AsyncSocketException& ex) {
640 handshakeEndTime_ = std::chrono::steady_clock::now();
641 if (handshakeCallback_ != nullptr) {
642 HandshakeCB* callback = handshakeCallback_;
643 handshakeCallback_ = nullptr;
644 callback->handshakeErr(this, ex);
648 void AsyncSSLSocket::invokeHandshakeCB() {
649 handshakeEndTime_ = std::chrono::steady_clock::now();
650 if (handshakeTimeout_.isScheduled()) {
651 handshakeTimeout_.cancelTimeout();
653 if (handshakeCallback_) {
654 HandshakeCB* callback = handshakeCallback_;
655 handshakeCallback_ = nullptr;
656 callback->handshakeSuc(this);
660 void AsyncSSLSocket::cacheLocalPeerAddr() {
661 SocketAddress address;
663 getLocalAddress(&address);
664 getPeerAddress(&address);
665 } catch (const std::system_error& e) {
666 // The handle can be still valid while the connection is already closed.
667 if (e.code() != std::error_code(ENOTCONN, std::system_category())) {
673 void AsyncSSLSocket::connect(ConnectCallback* callback,
674 const folly::SocketAddress& address,
676 const OptionMap &options,
677 const folly::SocketAddress& bindAddr)
680 assert(state_ == StateEnum::UNINIT);
681 assert(sslState_ == STATE_UNINIT);
682 AsyncSSLSocketConnector *connector =
683 new AsyncSSLSocketConnector(this, callback, timeout);
684 AsyncSocket::connect(connector, address, timeout, options, bindAddr);
687 void AsyncSSLSocket::applyVerificationOptions(SSL * ssl) {
688 // apply the settings specified in verifyPeer_
689 if (verifyPeer_ == SSLContext::SSLVerifyPeerEnum::USE_CTX) {
690 if(ctx_->needsPeerVerification()) {
691 SSL_set_verify(ssl, ctx_->getVerificationMode(),
692 AsyncSSLSocket::sslVerifyCallback);
695 if (verifyPeer_ == SSLContext::SSLVerifyPeerEnum::VERIFY ||
696 verifyPeer_ == SSLContext::SSLVerifyPeerEnum::VERIFY_REQ_CLIENT_CERT) {
697 SSL_set_verify(ssl, SSLContext::getVerificationMode(verifyPeer_),
698 AsyncSSLSocket::sslVerifyCallback);
703 bool AsyncSSLSocket::setupSSLBio() {
704 auto wb = BIO_new(&sslWriteBioMethod);
710 OpenSSLUtils::setBioAppData(wb, this);
711 OpenSSLUtils::setBioFd(wb, fd_, BIO_NOCLOSE);
712 SSL_set_bio(ssl_, wb, wb);
716 void AsyncSSLSocket::sslConn(HandshakeCB* callback, uint64_t timeout,
717 const SSLContext::SSLVerifyPeerEnum& verifyPeer) {
718 DestructorGuard dg(this);
719 assert(eventBase_->isInEventBaseThread());
721 // Cache local and remote socket addresses to keep them available
722 // after socket file descriptor is closed.
723 if (cacheAddrOnFailure_ && -1 != getFd()) {
724 cacheLocalPeerAddr();
727 verifyPeer_ = verifyPeer;
729 // Make sure we're in the uninitialized state
730 if (server_ || (sslState_ != STATE_UNINIT && sslState_ !=
731 STATE_UNENCRYPTED) ||
732 handshakeCallback_ != nullptr) {
733 return invalidState(callback);
736 sslState_ = STATE_CONNECTING;
737 handshakeCallback_ = callback;
740 ssl_ = ctx_->createSSL();
741 } catch (std::exception &e) {
742 sslState_ = STATE_ERROR;
743 AsyncSocketException ex(AsyncSocketException::INTERNAL_ERROR,
744 "error calling SSLContext::createSSL()");
745 LOG(ERROR) << "AsyncSSLSocket::sslConn(this=" << this << ", fd="
746 << fd_ << "): " << e.what();
747 return failHandshake(__func__, ex);
750 if (!setupSSLBio()) {
751 sslState_ = STATE_ERROR;
752 AsyncSocketException ex(
753 AsyncSocketException::INTERNAL_ERROR, "error creating SSL bio");
754 return failHandshake(__func__, ex);
757 applyVerificationOptions(ssl_);
759 if (sslSession_ != nullptr) {
760 sessionResumptionAttempted_ = true;
761 SSL_set_session(ssl_, sslSession_);
762 SSL_SESSION_free(sslSession_);
763 sslSession_ = nullptr;
765 #if OPENSSL_VERSION_NUMBER >= 0x1000105fL && !defined(OPENSSL_NO_TLSEXT)
766 if (tlsextHostname_.size()) {
767 SSL_set_tlsext_host_name(ssl_, tlsextHostname_.c_str());
771 SSL_set_ex_data(ssl_, getSSLExDataIndex(), this);
773 handshakeConnectTimeout_ = timeout;
777 // This could be called multiple times, during normal ssl connections
778 // and after TFO fallback.
779 void AsyncSSLSocket::startSSLConnect() {
780 handshakeStartTime_ = std::chrono::steady_clock::now();
781 // Make end time at least >= start time.
782 handshakeEndTime_ = handshakeStartTime_;
783 if (handshakeConnectTimeout_ > 0) {
784 handshakeTimeout_.scheduleTimeout(handshakeConnectTimeout_);
789 SSL_SESSION *AsyncSSLSocket::getSSLSession() {
790 if (ssl_ != nullptr && sslState_ == STATE_ESTABLISHED) {
791 return SSL_get1_session(ssl_);
797 const SSL* AsyncSSLSocket::getSSL() const {
801 void AsyncSSLSocket::setSSLSession(SSL_SESSION *session, bool takeOwnership) {
802 sslSession_ = session;
803 if (!takeOwnership && session != nullptr) {
804 // Increment the reference count
805 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION);
809 void AsyncSSLSocket::getSelectedNextProtocol(
810 const unsigned char** protoName,
812 SSLContext::NextProtocolType* protoType) const {
813 if (!getSelectedNextProtocolNoThrow(protoName, protoLen, protoType)) {
814 throw AsyncSocketException(AsyncSocketException::NOT_SUPPORTED,
815 "NPN not supported");
819 bool AsyncSSLSocket::getSelectedNextProtocolNoThrow(
820 const unsigned char** protoName,
822 SSLContext::NextProtocolType* protoType) const {
823 *protoName = nullptr;
825 #if OPENSSL_VERSION_NUMBER >= 0x1000200fL && !defined(OPENSSL_NO_TLSEXT)
826 SSL_get0_alpn_selected(ssl_, protoName, protoLen);
829 *protoType = SSLContext::NextProtocolType::ALPN;
834 #ifdef OPENSSL_NPN_NEGOTIATED
835 SSL_get0_next_proto_negotiated(ssl_, protoName, protoLen);
837 *protoType = SSLContext::NextProtocolType::NPN;
846 bool AsyncSSLSocket::getSSLSessionReused() const {
847 if (ssl_ != nullptr && sslState_ == STATE_ESTABLISHED) {
848 return SSL_session_reused(ssl_);
853 const char *AsyncSSLSocket::getNegotiatedCipherName() const {
854 return (ssl_ != nullptr) ? SSL_get_cipher_name(ssl_) : nullptr;
858 const char* AsyncSSLSocket::getSSLServerNameFromSSL(SSL* ssl) {
859 if (ssl == nullptr) {
862 #ifdef SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
863 return SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
869 const char *AsyncSSLSocket::getSSLServerName() const {
870 #ifdef SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
871 return getSSLServerNameFromSSL(ssl_);
873 throw AsyncSocketException(AsyncSocketException::NOT_SUPPORTED,
874 "SNI not supported");
878 const char *AsyncSSLSocket::getSSLServerNameNoThrow() const {
879 return getSSLServerNameFromSSL(ssl_);
882 int AsyncSSLSocket::getSSLVersion() const {
883 return (ssl_ != nullptr) ? SSL_version(ssl_) : 0;
886 const char *AsyncSSLSocket::getSSLCertSigAlgName() const {
887 X509 *cert = (ssl_ != nullptr) ? SSL_get_certificate(ssl_) : nullptr;
889 int nid = OBJ_obj2nid(cert->sig_alg->algorithm);
890 return OBJ_nid2ln(nid);
895 int AsyncSSLSocket::getSSLCertSize() const {
897 X509 *cert = (ssl_ != nullptr) ? SSL_get_certificate(ssl_) : nullptr;
899 EVP_PKEY *key = X509_get_pubkey(cert);
900 certSize = EVP_PKEY_bits(key);
906 const X509* AsyncSSLSocket::getSelfCert() const {
907 return (ssl_ != nullptr) ? SSL_get_certificate(ssl_) : nullptr;
910 bool AsyncSSLSocket::willBlock(int ret,
912 unsigned long* errErrorOut) noexcept {
914 int error = *sslErrorOut = SSL_get_error(ssl_, ret);
915 if (error == SSL_ERROR_WANT_READ) {
916 // Register for read event if not already.
917 updateEventRegistration(EventHandler::READ, EventHandler::WRITE);
919 } else if (error == SSL_ERROR_WANT_WRITE) {
920 VLOG(3) << "AsyncSSLSocket(fd=" << fd_
921 << ", state=" << int(state_) << ", sslState="
922 << sslState_ << ", events=" << eventFlags_ << "): "
923 << "SSL_ERROR_WANT_WRITE";
924 // Register for write event if not already.
925 updateEventRegistration(EventHandler::WRITE, EventHandler::READ);
927 #ifdef SSL_ERROR_WANT_SESS_CACHE_LOOKUP
928 } else if (error == SSL_ERROR_WANT_SESS_CACHE_LOOKUP) {
929 // We will block but we can't register our own socket. The callback that
930 // triggered this code will re-call handleAccept at the appropriate time.
932 // We can only get here if the linked libssl.so has support for this feature
933 // as well, otherwise SSL_get_error cannot return our error code.
934 sslState_ = STATE_CACHE_LOOKUP;
936 // Unregister for all events while blocked here
937 updateEventRegistration(EventHandler::NONE,
938 EventHandler::READ | EventHandler::WRITE);
940 // The timeout (if set) keeps running here
944 #ifdef SSL_ERROR_WANT_RSA_ASYNC_PENDING
945 || error == SSL_ERROR_WANT_RSA_ASYNC_PENDING
947 #ifdef SSL_ERROR_WANT_ECDSA_ASYNC_PENDING
948 || error == SSL_ERROR_WANT_ECDSA_ASYNC_PENDING
951 // Our custom openssl function has kicked off an async request to do
952 // rsa/ecdsa private key operation. When that call returns, a callback will
953 // be invoked that will re-call handleAccept.
954 sslState_ = STATE_ASYNC_PENDING;
956 // Unregister for all events while blocked here
957 updateEventRegistration(
959 EventHandler::READ | EventHandler::WRITE
962 // The timeout (if set) keeps running here
965 unsigned long lastError = *errErrorOut = ERR_get_error();
966 VLOG(6) << "AsyncSSLSocket(fd=" << fd_ << ", "
967 << "state=" << state_ << ", "
968 << "sslState=" << sslState_ << ", "
969 << "events=" << std::hex << eventFlags_ << "): "
970 << "SSL error: " << error << ", "
971 << "errno: " << errno << ", "
972 << "ret: " << ret << ", "
973 << "read: " << BIO_number_read(SSL_get_rbio(ssl_)) << ", "
974 << "written: " << BIO_number_written(SSL_get_wbio(ssl_)) << ", "
975 << "func: " << ERR_func_error_string(lastError) << ", "
976 << "reason: " << ERR_reason_error_string(lastError);
981 void AsyncSSLSocket::checkForImmediateRead() noexcept {
982 // openssl may have buffered data that it read from the socket already.
983 // In this case we have to process it immediately, rather than waiting for
984 // the socket to become readable again.
985 if (ssl_ != nullptr && SSL_pending(ssl_) > 0) {
986 AsyncSocket::handleRead();
991 AsyncSSLSocket::restartSSLAccept()
993 VLOG(3) << "AsyncSSLSocket::restartSSLAccept() this=" << this
994 << ", fd=" << fd_ << ", state=" << int(state_) << ", "
995 << "sslState=" << sslState_ << ", events=" << eventFlags_;
996 DestructorGuard dg(this);
998 sslState_ == STATE_CACHE_LOOKUP ||
999 sslState_ == STATE_ASYNC_PENDING ||
1000 sslState_ == STATE_ERROR ||
1001 sslState_ == STATE_CLOSED);
1002 if (sslState_ == STATE_CLOSED) {
1003 // I sure hope whoever closed this socket didn't delete it already,
1004 // but this is not strictly speaking an error
1007 if (sslState_ == STATE_ERROR) {
1008 // go straight to fail if timeout expired during lookup
1009 AsyncSocketException ex(AsyncSocketException::TIMED_OUT,
1010 "SSL accept timed out");
1011 failHandshake(__func__, ex);
1014 sslState_ = STATE_ACCEPTING;
1015 this->handleAccept();
1019 AsyncSSLSocket::handleAccept() noexcept {
1020 VLOG(3) << "AsyncSSLSocket::handleAccept() this=" << this
1021 << ", fd=" << fd_ << ", state=" << int(state_) << ", "
1022 << "sslState=" << sslState_ << ", events=" << eventFlags_;
1024 assert(state_ == StateEnum::ESTABLISHED &&
1025 sslState_ == STATE_ACCEPTING);
1027 /* lazily create the SSL structure */
1029 ssl_ = ctx_->createSSL();
1030 } catch (std::exception &e) {
1031 sslState_ = STATE_ERROR;
1032 AsyncSocketException ex(AsyncSocketException::INTERNAL_ERROR,
1033 "error calling SSLContext::createSSL()");
1034 LOG(ERROR) << "AsyncSSLSocket::handleAccept(this=" << this
1035 << ", fd=" << fd_ << "): " << e.what();
1036 return failHandshake(__func__, ex);
1039 if (!setupSSLBio()) {
1040 sslState_ = STATE_ERROR;
1041 AsyncSocketException ex(
1042 AsyncSocketException::INTERNAL_ERROR, "error creating write bio");
1043 return failHandshake(__func__, ex);
1046 SSL_set_ex_data(ssl_, getSSLExDataIndex(), this);
1048 applyVerificationOptions(ssl_);
1051 if (server_ && parseClientHello_) {
1052 SSL_set_msg_callback(ssl_, &AsyncSSLSocket::clientHelloParsingCallback);
1053 SSL_set_msg_callback_arg(ssl_, this);
1056 int ret = SSL_accept(ssl_);
1059 unsigned long errError;
1060 int errnoCopy = errno;
1061 if (willBlock(ret, &sslError, &errError)) {
1064 sslState_ = STATE_ERROR;
1065 SSLException ex(sslError, errError, ret, errnoCopy);
1066 return failHandshake(__func__, ex);
1070 handshakeComplete_ = true;
1071 updateEventRegistration(0, EventHandler::READ | EventHandler::WRITE);
1073 // Move into STATE_ESTABLISHED in the normal case that we are in
1075 sslState_ = STATE_ESTABLISHED;
1077 VLOG(3) << "AsyncSSLSocket " << this << ": fd " << fd_
1078 << " successfully accepted; state=" << int(state_)
1079 << ", sslState=" << sslState_ << ", events=" << eventFlags_;
1081 // Remember the EventBase we are attached to, before we start invoking any
1082 // callbacks (since the callbacks may call detachEventBase()).
1083 EventBase* originalEventBase = eventBase_;
1085 // Call the accept callback.
1086 invokeHandshakeCB();
1088 // Note that the accept callback may have changed our state.
1089 // (set or unset the read callback, called write(), closed the socket, etc.)
1090 // The following code needs to handle these situations correctly.
1092 // If the socket has been closed, readCallback_ and writeReqHead_ will
1093 // always be nullptr, so that will prevent us from trying to read or write.
1095 // The main thing to check for is if eventBase_ is still originalEventBase.
1096 // If not, we have been detached from this event base, so we shouldn't
1097 // perform any more operations.
1098 if (eventBase_ != originalEventBase) {
1102 AsyncSocket::handleInitialReadWrite();
1106 AsyncSSLSocket::handleConnect() noexcept {
1107 VLOG(3) << "AsyncSSLSocket::handleConnect() this=" << this
1108 << ", fd=" << fd_ << ", state=" << int(state_) << ", "
1109 << "sslState=" << sslState_ << ", events=" << eventFlags_;
1111 if (state_ < StateEnum::ESTABLISHED) {
1112 return AsyncSocket::handleConnect();
1116 (state_ == StateEnum::FAST_OPEN || state_ == StateEnum::ESTABLISHED) &&
1117 sslState_ == STATE_CONNECTING);
1120 auto originalState = state_;
1121 int ret = SSL_connect(ssl_);
1124 unsigned long errError;
1125 int errnoCopy = errno;
1126 if (willBlock(ret, &sslError, &errError)) {
1127 // We fell back to connecting state due to TFO
1128 if (state_ == StateEnum::CONNECTING) {
1129 DCHECK_EQ(StateEnum::FAST_OPEN, originalState);
1130 if (handshakeTimeout_.isScheduled()) {
1131 handshakeTimeout_.cancelTimeout();
1136 sslState_ = STATE_ERROR;
1137 SSLException ex(sslError, errError, ret, errnoCopy);
1138 return failHandshake(__func__, ex);
1142 handshakeComplete_ = true;
1143 updateEventRegistration(0, EventHandler::READ | EventHandler::WRITE);
1145 // Move into STATE_ESTABLISHED in the normal case that we are in
1146 // STATE_CONNECTING.
1147 sslState_ = STATE_ESTABLISHED;
1149 VLOG(3) << "AsyncSSLSocket " << this << ": "
1150 << "fd " << fd_ << " successfully connected; "
1151 << "state=" << int(state_) << ", sslState=" << sslState_
1152 << ", events=" << eventFlags_;
1154 // Remember the EventBase we are attached to, before we start invoking any
1155 // callbacks (since the callbacks may call detachEventBase()).
1156 EventBase* originalEventBase = eventBase_;
1158 // Call the handshake callback.
1159 invokeHandshakeCB();
1161 // Note that the connect callback may have changed our state.
1162 // (set or unset the read callback, called write(), closed the socket, etc.)
1163 // The following code needs to handle these situations correctly.
1165 // If the socket has been closed, readCallback_ and writeReqHead_ will
1166 // always be nullptr, so that will prevent us from trying to read or write.
1168 // The main thing to check for is if eventBase_ is still originalEventBase.
1169 // If not, we have been detached from this event base, so we shouldn't
1170 // perform any more operations.
1171 if (eventBase_ != originalEventBase) {
1175 AsyncSocket::handleInitialReadWrite();
1178 void AsyncSSLSocket::invokeConnectErr(const AsyncSocketException& ex) {
1179 connectionTimeout_.cancelTimeout();
1180 AsyncSocket::invokeConnectErr(ex);
1183 void AsyncSSLSocket::invokeConnectSuccess() {
1184 connectionTimeout_.cancelTimeout();
1185 if (sslState_ == SSLStateEnum::STATE_CONNECTING) {
1186 // If we failed TFO, we'd fall back to trying to connect the socket,
1187 // to setup things like timeouts.
1190 // still invoke the base class since it re-sets the connect time.
1191 AsyncSocket::invokeConnectSuccess();
1194 void AsyncSSLSocket::scheduleConnectTimeout() {
1195 if (sslState_ == SSLStateEnum::STATE_CONNECTING) {
1196 // We fell back from TFO, and need to set the timeouts.
1197 // We will not have a connect callback in this case, thus if the timer
1198 // expires we would have no-one to notify.
1199 // Thus we should reset even the connect timers to point to the handshake
1201 assert(connectCallback_ == nullptr);
1202 // We use a different connect timeout here than the handshake timeout, so
1203 // that we can disambiguate the 2 timers.
1204 int timeout = connectTimeout_.count();
1206 if (!connectionTimeout_.scheduleTimeout(timeout)) {
1207 throw AsyncSocketException(
1208 AsyncSocketException::INTERNAL_ERROR,
1209 withAddr("failed to schedule AsyncSSLSocket connect timeout"));
1214 AsyncSocket::scheduleConnectTimeout();
1217 void AsyncSSLSocket::setReadCB(ReadCallback *callback) {
1218 #ifdef SSL_MODE_MOVE_BUFFER_OWNERSHIP
1219 // turn on the buffer movable in openssl
1220 if (bufferMovableEnabled_ && ssl_ != nullptr && !isBufferMovable_ &&
1221 callback != nullptr && callback->isBufferMovable()) {
1222 SSL_set_mode(ssl_, SSL_get_mode(ssl_) | SSL_MODE_MOVE_BUFFER_OWNERSHIP);
1223 isBufferMovable_ = true;
1227 AsyncSocket::setReadCB(callback);
1230 void AsyncSSLSocket::setBufferMovableEnabled(bool enabled) {
1231 bufferMovableEnabled_ = enabled;
1234 void AsyncSSLSocket::prepareReadBuffer(void** buf, size_t* buflen) noexcept {
1235 CHECK(readCallback_);
1236 if (isBufferMovable_) {
1240 // buf is necessary for SSLSocket without SSL_MODE_MOVE_BUFFER_OWNERSHIP
1241 readCallback_->getReadBuffer(buf, buflen);
1246 AsyncSSLSocket::handleRead() noexcept {
1247 VLOG(5) << "AsyncSSLSocket::handleRead() this=" << this << ", fd=" << fd_
1248 << ", state=" << int(state_) << ", "
1249 << "sslState=" << sslState_ << ", events=" << eventFlags_;
1250 if (state_ < StateEnum::ESTABLISHED) {
1251 return AsyncSocket::handleRead();
1255 if (sslState_ == STATE_ACCEPTING) {
1260 else if (sslState_ == STATE_CONNECTING) {
1267 AsyncSocket::handleRead();
1270 AsyncSocket::ReadResult
1271 AsyncSSLSocket::performRead(void** buf, size_t* buflen, size_t* offset) {
1272 VLOG(4) << "AsyncSSLSocket::performRead() this=" << this << ", buf=" << *buf
1273 << ", buflen=" << *buflen;
1275 if (sslState_ == STATE_UNENCRYPTED) {
1276 return AsyncSocket::performRead(buf, buflen, offset);
1280 if (!isBufferMovable_) {
1281 bytes = SSL_read(ssl_, *buf, *buflen);
1283 #ifdef SSL_MODE_MOVE_BUFFER_OWNERSHIP
1285 bytes = SSL_read_buf(ssl_, buf, (int *) offset, (int *) buflen);
1289 if (server_ && renegotiateAttempted_) {
1290 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1291 << ", sslstate=" << sslState_ << ", events=" << eventFlags_
1292 << "): client intitiated SSL renegotiation not permitted";
1295 folly::make_unique<SSLException>(SSLError::CLIENT_RENEGOTIATION));
1298 int error = SSL_get_error(ssl_, bytes);
1299 if (error == SSL_ERROR_WANT_READ) {
1300 // The caller will register for read event if not already.
1301 if (errno == EWOULDBLOCK || errno == EAGAIN) {
1302 return ReadResult(READ_BLOCKING);
1304 return ReadResult(READ_ERROR);
1306 } else if (error == SSL_ERROR_WANT_WRITE) {
1307 // TODO: Even though we are attempting to read data, SSL_read() may
1308 // need to write data if renegotiation is being performed. We currently
1309 // don't support this and just fail the read.
1310 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1311 << ", sslState=" << sslState_ << ", events=" << eventFlags_
1312 << "): unsupported SSL renegotiation during read";
1315 folly::make_unique<SSLException>(SSLError::INVALID_RENEGOTIATION));
1317 if (zero_return(error, bytes)) {
1318 return ReadResult(bytes);
1320 long errError = ERR_get_error();
1321 VLOG(6) << "AsyncSSLSocket(fd=" << fd_ << ", "
1322 << "state=" << state_ << ", "
1323 << "sslState=" << sslState_ << ", "
1324 << "events=" << std::hex << eventFlags_ << "): "
1325 << "bytes: " << bytes << ", "
1326 << "error: " << error << ", "
1327 << "errno: " << errno << ", "
1328 << "func: " << ERR_func_error_string(errError) << ", "
1329 << "reason: " << ERR_reason_error_string(errError);
1332 folly::make_unique<SSLException>(error, errError, bytes, errno));
1335 appBytesReceived_ += bytes;
1336 return ReadResult(bytes);
1340 void AsyncSSLSocket::handleWrite() noexcept {
1341 VLOG(5) << "AsyncSSLSocket::handleWrite() this=" << this << ", fd=" << fd_
1342 << ", state=" << int(state_) << ", "
1343 << "sslState=" << sslState_ << ", events=" << eventFlags_;
1344 if (state_ < StateEnum::ESTABLISHED) {
1345 return AsyncSocket::handleWrite();
1348 if (sslState_ == STATE_ACCEPTING) {
1354 if (sslState_ == STATE_CONNECTING) {
1361 AsyncSocket::handleWrite();
1364 AsyncSocket::WriteResult AsyncSSLSocket::interpretSSLError(int rc, int error) {
1365 if (error == SSL_ERROR_WANT_READ) {
1366 // Even though we are attempting to write data, SSL_write() may
1367 // need to read data if renegotiation is being performed. We currently
1368 // don't support this and just fail the write.
1369 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1370 << ", sslState=" << sslState_ << ", events=" << eventFlags_
1372 << "unsupported SSL renegotiation during write";
1375 folly::make_unique<SSLException>(SSLError::INVALID_RENEGOTIATION));
1377 if (zero_return(error, rc)) {
1378 return WriteResult(0);
1380 auto errError = ERR_get_error();
1381 VLOG(3) << "ERROR: AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1382 << ", sslState=" << sslState_ << ", events=" << eventFlags_ << "): "
1383 << "SSL error: " << error << ", errno: " << errno
1384 << ", func: " << ERR_func_error_string(errError)
1385 << ", reason: " << ERR_reason_error_string(errError);
1388 folly::make_unique<SSLException>(error, errError, rc, errno));
1392 AsyncSocket::WriteResult AsyncSSLSocket::performWrite(
1396 uint32_t* countWritten,
1397 uint32_t* partialWritten) {
1398 if (sslState_ == STATE_UNENCRYPTED) {
1399 return AsyncSocket::performWrite(
1400 vec, count, flags, countWritten, partialWritten);
1402 if (sslState_ != STATE_ESTABLISHED) {
1403 LOG(ERROR) << "AsyncSSLSocket(fd=" << fd_ << ", state=" << int(state_)
1404 << ", sslState=" << sslState_
1405 << ", events=" << eventFlags_ << "): "
1406 << "TODO: AsyncSSLSocket currently does not support calling "
1407 << "write() before the handshake has fully completed";
1409 WRITE_ERROR, folly::make_unique<SSLException>(SSLError::EARLY_WRITE));
1412 bool cork = isSet(flags, WriteFlags::CORK);
1413 CorkGuard guard(fd_, count > 1, cork, &corked_);
1415 // Declare a buffer used to hold small write requests. It could point to a
1416 // memory block either on stack or on heap. If it is on heap, we release it
1417 // manually when scope exits
1418 char* combinedBuf{nullptr};
1420 // Note, always keep this check consistent with what we do below
1421 if (combinedBuf != nullptr && minWriteSize_ > MAX_STACK_BUF_SIZE) {
1422 delete[] combinedBuf;
1427 *partialWritten = 0;
1428 ssize_t totalWritten = 0;
1429 size_t bytesStolenFromNextBuffer = 0;
1430 for (uint32_t i = 0; i < count; i++) {
1431 const iovec* v = vec + i;
1432 size_t offset = bytesStolenFromNextBuffer;
1433 bytesStolenFromNextBuffer = 0;
1434 size_t len = v->iov_len - offset;
1440 buf = ((const char*)v->iov_base) + offset;
1443 uint32_t buffersStolen = 0;
1444 if ((len < minWriteSize_) && ((i + 1) < count)) {
1445 // Combine this buffer with part or all of the next buffers in
1446 // order to avoid really small-grained calls to SSL_write().
1447 // Each call to SSL_write() produces a separate record in
1448 // the egress SSL stream, and we've found that some low-end
1449 // mobile clients can't handle receiving an HTTP response
1450 // header and the first part of the response body in two
1451 // separate SSL records (even if those two records are in
1452 // the same TCP packet).
1454 if (combinedBuf == nullptr) {
1455 if (minWriteSize_ > MAX_STACK_BUF_SIZE) {
1456 // Allocate the buffer on heap
1457 combinedBuf = new char[minWriteSize_];
1459 // Allocate the buffer on stack
1460 combinedBuf = (char*)alloca(minWriteSize_);
1463 assert(combinedBuf != nullptr);
1465 memcpy(combinedBuf, buf, len);
1467 // INVARIANT: i + buffersStolen == complete chunks serialized
1468 uint32_t nextIndex = i + buffersStolen + 1;
1469 bytesStolenFromNextBuffer = std::min(vec[nextIndex].iov_len,
1470 minWriteSize_ - len);
1471 memcpy(combinedBuf + len, vec[nextIndex].iov_base,
1472 bytesStolenFromNextBuffer);
1473 len += bytesStolenFromNextBuffer;
1474 if (bytesStolenFromNextBuffer < vec[nextIndex].iov_len) {
1475 // couldn't steal the whole buffer
1478 bytesStolenFromNextBuffer = 0;
1481 } while ((i + buffersStolen + 1) < count && (len < minWriteSize_));
1482 bytes = eorAwareSSLWrite(
1483 ssl_, combinedBuf, len,
1484 (isSet(flags, WriteFlags::EOR) && i + buffersStolen + 1 == count));
1487 bytes = eorAwareSSLWrite(ssl_, buf, len,
1488 (isSet(flags, WriteFlags::EOR) && i + 1 == count));
1492 int error = SSL_get_error(ssl_, bytes);
1493 if (error == SSL_ERROR_WANT_WRITE) {
1494 // The caller will register for write event if not already.
1495 *partialWritten = offset;
1496 return WriteResult(totalWritten);
1498 auto writeResult = interpretSSLError(bytes, error);
1499 if (writeResult.writeReturn < 0) {
1501 } // else fall through to below to correctly record totalWritten
1504 totalWritten += bytes;
1506 if (bytes == (ssize_t)len) {
1507 // The full iovec is written.
1508 (*countWritten) += 1 + buffersStolen;
1512 bytes += offset; // adjust bytes to account for all of v
1513 while (bytes >= (ssize_t)v->iov_len) {
1514 // We combined this buf with part or all of the next one, and
1515 // we managed to write all of this buf but not all of the bytes
1516 // from the next one that we'd hoped to write.
1517 bytes -= v->iov_len;
1521 *partialWritten = bytes;
1522 return WriteResult(totalWritten);
1526 return WriteResult(totalWritten);
1529 int AsyncSSLSocket::eorAwareSSLWrite(SSL *ssl, const void *buf, int n,
1531 if (eor && trackEor_) {
1532 if (appEorByteNo_) {
1533 // cannot track for more than one app byte EOR
1534 CHECK(appEorByteNo_ == appBytesWritten_ + n);
1536 appEorByteNo_ = appBytesWritten_ + n;
1539 // 1. It is fine to keep updating minEorRawByteNo_.
1540 // 2. It is _min_ in the sense that SSL record will add some overhead.
1541 minEorRawByteNo_ = getRawBytesWritten() + n;
1544 n = sslWriteImpl(ssl, buf, n);
1546 appBytesWritten_ += n;
1547 if (appEorByteNo_) {
1548 if (getRawBytesWritten() >= minEorRawByteNo_) {
1549 minEorRawByteNo_ = 0;
1551 if(appBytesWritten_ == appEorByteNo_) {
1554 CHECK(appBytesWritten_ < appEorByteNo_);
1561 void AsyncSSLSocket::sslInfoCallback(const SSL* ssl, int where, int ret) {
1562 AsyncSSLSocket *sslSocket = AsyncSSLSocket::getFromSSL(ssl);
1563 if (sslSocket->handshakeComplete_ && (where & SSL_CB_HANDSHAKE_START)) {
1564 sslSocket->renegotiateAttempted_ = true;
1566 if (where & SSL_CB_READ_ALERT) {
1567 const char* type = SSL_alert_type_string(ret);
1569 const char* desc = SSL_alert_desc_string(ret);
1570 sslSocket->alertsReceived_.emplace_back(
1571 *type, StringPiece(desc, std::strlen(desc)));
1576 int AsyncSSLSocket::bioWrite(BIO* b, const char* in, int inl) {
1580 AsyncSSLSocket* tsslSock;
1582 iov.iov_base = const_cast<char*>(in);
1584 memset(&msg, 0, sizeof(msg));
1588 auto appData = OpenSSLUtils::getBioAppData(b);
1591 tsslSock = reinterpret_cast<AsyncSSLSocket*>(appData);
1594 if (tsslSock->trackEor_ && tsslSock->minEorRawByteNo_ &&
1595 tsslSock->minEorRawByteNo_ <= BIO_number_written(b) + inl) {
1600 flags |= MSG_NOSIGNAL;
1603 auto result = tsslSock->sendSocketMessage(
1604 OpenSSLUtils::getBioFd(b, nullptr), &msg, flags);
1605 BIO_clear_retry_flags(b);
1606 if (!result.exception && result.writeReturn <= 0) {
1607 if (OpenSSLUtils::getBioShouldRetryWrite(result.writeReturn)) {
1608 BIO_set_retry_write(b);
1611 return result.writeReturn;
1614 int AsyncSSLSocket::sslVerifyCallback(
1616 X509_STORE_CTX* x509Ctx) {
1617 SSL* ssl = (SSL*) X509_STORE_CTX_get_ex_data(
1618 x509Ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
1619 AsyncSSLSocket* self = AsyncSSLSocket::getFromSSL(ssl);
1621 VLOG(3) << "AsyncSSLSocket::sslVerifyCallback() this=" << self << ", "
1622 << "fd=" << self->fd_ << ", preverifyOk=" << preverifyOk;
1623 return (self->handshakeCallback_) ?
1624 self->handshakeCallback_->handshakeVer(self, preverifyOk, x509Ctx) :
1628 void AsyncSSLSocket::enableClientHelloParsing() {
1629 parseClientHello_ = true;
1630 clientHelloInfo_.reset(new ssl::ClientHelloInfo());
1633 void AsyncSSLSocket::resetClientHelloParsing(SSL *ssl) {
1634 SSL_set_msg_callback(ssl, nullptr);
1635 SSL_set_msg_callback_arg(ssl, nullptr);
1636 clientHelloInfo_->clientHelloBuf_.clear();
1639 void AsyncSSLSocket::clientHelloParsingCallback(int written,
1646 AsyncSSLSocket *sock = static_cast<AsyncSSLSocket*>(arg);
1648 sock->resetClientHelloParsing(ssl);
1651 if (contentType != SSL3_RT_HANDSHAKE) {
1658 auto& clientHelloBuf = sock->clientHelloInfo_->clientHelloBuf_;
1659 clientHelloBuf.append(IOBuf::wrapBuffer(buf, len));
1661 Cursor cursor(clientHelloBuf.front());
1662 if (cursor.read<uint8_t>() != SSL3_MT_CLIENT_HELLO) {
1663 sock->resetClientHelloParsing(ssl);
1667 if (cursor.totalLength() < 3) {
1668 clientHelloBuf.trimEnd(len);
1669 clientHelloBuf.append(IOBuf::copyBuffer(buf, len));
1673 uint32_t messageLength = cursor.read<uint8_t>();
1674 messageLength <<= 8;
1675 messageLength |= cursor.read<uint8_t>();
1676 messageLength <<= 8;
1677 messageLength |= cursor.read<uint8_t>();
1678 if (cursor.totalLength() < messageLength) {
1679 clientHelloBuf.trimEnd(len);
1680 clientHelloBuf.append(IOBuf::copyBuffer(buf, len));
1684 sock->clientHelloInfo_->clientHelloMajorVersion_ = cursor.read<uint8_t>();
1685 sock->clientHelloInfo_->clientHelloMinorVersion_ = cursor.read<uint8_t>();
1687 cursor.skip(4); // gmt_unix_time
1688 cursor.skip(28); // random_bytes
1690 cursor.skip(cursor.read<uint8_t>()); // session_id
1692 uint16_t cipherSuitesLength = cursor.readBE<uint16_t>();
1693 for (int i = 0; i < cipherSuitesLength; i += 2) {
1694 sock->clientHelloInfo_->
1695 clientHelloCipherSuites_.push_back(cursor.readBE<uint16_t>());
1698 uint8_t compressionMethodsLength = cursor.read<uint8_t>();
1699 for (int i = 0; i < compressionMethodsLength; ++i) {
1700 sock->clientHelloInfo_->
1701 clientHelloCompressionMethods_.push_back(cursor.readBE<uint8_t>());
1704 if (cursor.totalLength() > 0) {
1705 uint16_t extensionsLength = cursor.readBE<uint16_t>();
1706 while (extensionsLength) {
1707 ssl::TLSExtension extensionType =
1708 static_cast<ssl::TLSExtension>(cursor.readBE<uint16_t>());
1709 sock->clientHelloInfo_->
1710 clientHelloExtensions_.push_back(extensionType);
1711 extensionsLength -= 2;
1712 uint16_t extensionDataLength = cursor.readBE<uint16_t>();
1713 extensionsLength -= 2;
1714 extensionsLength -= extensionDataLength;
1716 if (extensionType == ssl::TLSExtension::SIGNATURE_ALGORITHMS) {
1718 extensionDataLength -= 2;
1719 while (extensionDataLength) {
1720 ssl::HashAlgorithm hashAlg =
1721 static_cast<ssl::HashAlgorithm>(cursor.readBE<uint8_t>());
1722 ssl::SignatureAlgorithm sigAlg =
1723 static_cast<ssl::SignatureAlgorithm>(cursor.readBE<uint8_t>());
1724 extensionDataLength -= 2;
1725 sock->clientHelloInfo_->
1726 clientHelloSigAlgs_.emplace_back(hashAlg, sigAlg);
1729 cursor.skip(extensionDataLength);
1733 } catch (std::out_of_range& e) {
1734 // we'll use what we found and cleanup below.
1735 VLOG(4) << "AsyncSSLSocket::clientHelloParsingCallback(): "
1736 << "buffer finished unexpectedly." << " AsyncSSLSocket socket=" << sock;
1739 sock->resetClientHelloParsing(ssl);