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|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/socket/ssl_server_socket_openssl.h"
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <utility>
#include "base/callback_helpers.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "crypto/openssl_util.h"
#include "crypto/rsa_private_key.h"
#include "crypto/scoped_openssl_types.h"
#include "net/base/net_errors.h"
#include "net/ssl/openssl_ssl_util.h"
#include "net/ssl/scoped_openssl_types.h"
#define GotoState(s) next_handshake_state_ = s
namespace net {
void EnableSSLServerSockets() {
// No-op because CreateSSLServerSocket() calls crypto::EnsureOpenSSLInit().
}
scoped_ptr<SSLServerSocket> CreateSSLServerSocket(
scoped_ptr<StreamSocket> socket,
X509Certificate* certificate,
crypto::RSAPrivateKey* key,
const SSLServerConfig& ssl_config) {
crypto::EnsureOpenSSLInit();
return scoped_ptr<SSLServerSocket>(new SSLServerSocketOpenSSL(
std::move(socket), certificate, key, ssl_config));
}
SSLServerSocketOpenSSL::SSLServerSocketOpenSSL(
scoped_ptr<StreamSocket> transport_socket,
scoped_refptr<X509Certificate> certificate,
crypto::RSAPrivateKey* key,
const SSLServerConfig& ssl_config)
: transport_send_busy_(false),
transport_recv_busy_(false),
transport_recv_eof_(false),
user_read_buf_len_(0),
user_write_buf_len_(0),
transport_write_error_(OK),
ssl_(NULL),
transport_bio_(NULL),
transport_socket_(std::move(transport_socket)),
ssl_config_(ssl_config),
cert_(certificate),
next_handshake_state_(STATE_NONE),
completed_handshake_(false) {
// TODO(byungchul): Need a better way to clone a key.
std::vector<uint8_t> key_bytes;
CHECK(key->ExportPrivateKey(&key_bytes));
key_.reset(crypto::RSAPrivateKey::CreateFromPrivateKeyInfo(key_bytes));
CHECK(key_.get());
}
SSLServerSocketOpenSSL::~SSLServerSocketOpenSSL() {
if (ssl_) {
// Calling SSL_shutdown prevents the session from being marked as
// unresumable.
SSL_shutdown(ssl_);
SSL_free(ssl_);
ssl_ = NULL;
}
if (transport_bio_) {
BIO_free_all(transport_bio_);
transport_bio_ = NULL;
}
}
int SSLServerSocketOpenSSL::Handshake(const CompletionCallback& callback) {
net_log_.BeginEvent(NetLog::TYPE_SSL_SERVER_HANDSHAKE);
// Set up new ssl object.
int rv = Init();
if (rv != OK) {
LOG(ERROR) << "Failed to initialize OpenSSL: rv=" << rv;
net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_SERVER_HANDSHAKE, rv);
return rv;
}
// Set SSL to server mode. Handshake happens in the loop below.
SSL_set_accept_state(ssl_);
GotoState(STATE_HANDSHAKE);
rv = DoHandshakeLoop(OK);
if (rv == ERR_IO_PENDING) {
user_handshake_callback_ = callback;
} else {
net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_SERVER_HANDSHAKE, rv);
}
return rv > OK ? OK : rv;
}
int SSLServerSocketOpenSSL::ExportKeyingMaterial(
const base::StringPiece& label,
bool has_context,
const base::StringPiece& context,
unsigned char* out,
unsigned int outlen) {
if (!IsConnected())
return ERR_SOCKET_NOT_CONNECTED;
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
int rv = SSL_export_keying_material(
ssl_, out, outlen, label.data(), label.size(),
reinterpret_cast<const unsigned char*>(context.data()),
context.length(), context.length() > 0);
if (rv != 1) {
int ssl_error = SSL_get_error(ssl_, rv);
LOG(ERROR) << "Failed to export keying material;"
<< " returned " << rv
<< ", SSL error code " << ssl_error;
return MapOpenSSLError(ssl_error, err_tracer);
}
return OK;
}
int SSLServerSocketOpenSSL::GetTLSUniqueChannelBinding(std::string* out) {
NOTIMPLEMENTED();
return ERR_NOT_IMPLEMENTED;
}
int SSLServerSocketOpenSSL::Read(IOBuffer* buf, int buf_len,
const CompletionCallback& callback) {
DCHECK(user_read_callback_.is_null());
DCHECK(user_handshake_callback_.is_null());
DCHECK(!user_read_buf_.get());
DCHECK(!callback.is_null());
user_read_buf_ = buf;
user_read_buf_len_ = buf_len;
DCHECK(completed_handshake_);
int rv = DoReadLoop(OK);
if (rv == ERR_IO_PENDING) {
user_read_callback_ = callback;
} else {
user_read_buf_ = NULL;
user_read_buf_len_ = 0;
}
return rv;
}
int SSLServerSocketOpenSSL::Write(IOBuffer* buf, int buf_len,
const CompletionCallback& callback) {
DCHECK(user_write_callback_.is_null());
DCHECK(!user_write_buf_.get());
DCHECK(!callback.is_null());
user_write_buf_ = buf;
user_write_buf_len_ = buf_len;
int rv = DoWriteLoop(OK);
if (rv == ERR_IO_PENDING) {
user_write_callback_ = callback;
} else {
user_write_buf_ = NULL;
user_write_buf_len_ = 0;
}
return rv;
}
int SSLServerSocketOpenSSL::SetReceiveBufferSize(int32_t size) {
return transport_socket_->SetReceiveBufferSize(size);
}
int SSLServerSocketOpenSSL::SetSendBufferSize(int32_t size) {
return transport_socket_->SetSendBufferSize(size);
}
int SSLServerSocketOpenSSL::Connect(const CompletionCallback& callback) {
NOTIMPLEMENTED();
return ERR_NOT_IMPLEMENTED;
}
void SSLServerSocketOpenSSL::Disconnect() {
transport_socket_->Disconnect();
}
bool SSLServerSocketOpenSSL::IsConnected() const {
// TODO(wtc): Find out if we should check transport_socket_->IsConnected()
// as well.
return completed_handshake_;
}
bool SSLServerSocketOpenSSL::IsConnectedAndIdle() const {
return completed_handshake_ && transport_socket_->IsConnectedAndIdle();
}
int SSLServerSocketOpenSSL::GetPeerAddress(IPEndPoint* address) const {
if (!IsConnected())
return ERR_SOCKET_NOT_CONNECTED;
return transport_socket_->GetPeerAddress(address);
}
int SSLServerSocketOpenSSL::GetLocalAddress(IPEndPoint* address) const {
if (!IsConnected())
return ERR_SOCKET_NOT_CONNECTED;
return transport_socket_->GetLocalAddress(address);
}
const BoundNetLog& SSLServerSocketOpenSSL::NetLog() const {
return net_log_;
}
void SSLServerSocketOpenSSL::SetSubresourceSpeculation() {
transport_socket_->SetSubresourceSpeculation();
}
void SSLServerSocketOpenSSL::SetOmniboxSpeculation() {
transport_socket_->SetOmniboxSpeculation();
}
bool SSLServerSocketOpenSSL::WasEverUsed() const {
return transport_socket_->WasEverUsed();
}
bool SSLServerSocketOpenSSL::UsingTCPFastOpen() const {
return transport_socket_->UsingTCPFastOpen();
}
bool SSLServerSocketOpenSSL::WasNpnNegotiated() const {
NOTIMPLEMENTED();
return false;
}
NextProto SSLServerSocketOpenSSL::GetNegotiatedProtocol() const {
// NPN is not supported by this class.
return kProtoUnknown;
}
bool SSLServerSocketOpenSSL::GetSSLInfo(SSLInfo* ssl_info) {
NOTIMPLEMENTED();
return false;
}
void SSLServerSocketOpenSSL::GetConnectionAttempts(
ConnectionAttempts* out) const {
out->clear();
}
int64_t SSLServerSocketOpenSSL::GetTotalReceivedBytes() const {
return transport_socket_->GetTotalReceivedBytes();
}
void SSLServerSocketOpenSSL::OnSendComplete(int result) {
if (next_handshake_state_ == STATE_HANDSHAKE) {
// In handshake phase.
OnHandshakeIOComplete(result);
return;
}
// TODO(byungchul): This state machine is not correct. Copy the state machine
// of SSLClientSocketOpenSSL::OnSendComplete() which handles it better.
if (!completed_handshake_)
return;
if (user_write_buf_.get()) {
int rv = DoWriteLoop(result);
if (rv != ERR_IO_PENDING)
DoWriteCallback(rv);
} else {
// Ensure that any queued ciphertext is flushed.
DoTransportIO();
}
}
void SSLServerSocketOpenSSL::OnRecvComplete(int result) {
if (next_handshake_state_ == STATE_HANDSHAKE) {
// In handshake phase.
OnHandshakeIOComplete(result);
return;
}
// Network layer received some data, check if client requested to read
// decrypted data.
if (!user_read_buf_.get() || !completed_handshake_)
return;
int rv = DoReadLoop(result);
if (rv != ERR_IO_PENDING)
DoReadCallback(rv);
}
void SSLServerSocketOpenSSL::OnHandshakeIOComplete(int result) {
int rv = DoHandshakeLoop(result);
if (rv == ERR_IO_PENDING)
return;
net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SSL_SERVER_HANDSHAKE, rv);
if (!user_handshake_callback_.is_null())
DoHandshakeCallback(rv);
}
// Return 0 for EOF,
// > 0 for bytes transferred immediately,
// < 0 for error (or the non-error ERR_IO_PENDING).
int SSLServerSocketOpenSSL::BufferSend() {
if (transport_send_busy_)
return ERR_IO_PENDING;
if (!send_buffer_.get()) {
// Get a fresh send buffer out of the send BIO.
size_t max_read = BIO_pending(transport_bio_);
if (!max_read)
return 0; // Nothing pending in the OpenSSL write BIO.
send_buffer_ = new DrainableIOBuffer(new IOBuffer(max_read), max_read);
int read_bytes = BIO_read(transport_bio_, send_buffer_->data(), max_read);
DCHECK_GT(read_bytes, 0);
CHECK_EQ(static_cast<int>(max_read), read_bytes);
}
int rv = transport_socket_->Write(
send_buffer_.get(),
send_buffer_->BytesRemaining(),
base::Bind(&SSLServerSocketOpenSSL::BufferSendComplete,
base::Unretained(this)));
if (rv == ERR_IO_PENDING) {
transport_send_busy_ = true;
} else {
TransportWriteComplete(rv);
}
return rv;
}
void SSLServerSocketOpenSSL::BufferSendComplete(int result) {
transport_send_busy_ = false;
TransportWriteComplete(result);
OnSendComplete(result);
}
void SSLServerSocketOpenSSL::TransportWriteComplete(int result) {
DCHECK(ERR_IO_PENDING != result);
if (result < 0) {
// Got a socket write error; close the BIO to indicate this upward.
//
// TODO(davidben): The value of |result| gets lost. Feed the error back into
// the BIO so it gets (re-)detected in OnSendComplete. Perhaps with
// BIO_set_callback.
DVLOG(1) << "TransportWriteComplete error " << result;
(void)BIO_shutdown_wr(SSL_get_wbio(ssl_));
// Match the fix for http://crbug.com/249848 in NSS by erroring future reads
// from the socket after a write error.
//
// TODO(davidben): Avoid having read and write ends interact this way.
transport_write_error_ = result;
(void)BIO_shutdown_wr(transport_bio_);
send_buffer_ = NULL;
} else {
DCHECK(send_buffer_.get());
send_buffer_->DidConsume(result);
DCHECK_GE(send_buffer_->BytesRemaining(), 0);
if (send_buffer_->BytesRemaining() <= 0)
send_buffer_ = NULL;
}
}
int SSLServerSocketOpenSSL::BufferRecv() {
if (transport_recv_busy_)
return ERR_IO_PENDING;
// Determine how much was requested from |transport_bio_| that was not
// actually available.
size_t requested = BIO_ctrl_get_read_request(transport_bio_);
if (requested == 0) {
// This is not a perfect match of error codes, as no operation is
// actually pending. However, returning 0 would be interpreted as
// a possible sign of EOF, which is also an inappropriate match.
return ERR_IO_PENDING;
}
// Known Issue: While only reading |requested| data is the more correct
// implementation, it has the downside of resulting in frequent reads:
// One read for the SSL record header (~5 bytes) and one read for the SSL
// record body. Rather than issuing these reads to the underlying socket
// (and constantly allocating new IOBuffers), a single Read() request to
// fill |transport_bio_| is issued. As long as an SSL client socket cannot
// be gracefully shutdown (via SSL close alerts) and re-used for non-SSL
// traffic, this over-subscribed Read()ing will not cause issues.
size_t max_write = BIO_ctrl_get_write_guarantee(transport_bio_);
if (!max_write)
return ERR_IO_PENDING;
recv_buffer_ = new IOBuffer(max_write);
int rv = transport_socket_->Read(
recv_buffer_.get(),
max_write,
base::Bind(&SSLServerSocketOpenSSL::BufferRecvComplete,
base::Unretained(this)));
if (rv == ERR_IO_PENDING) {
transport_recv_busy_ = true;
} else {
rv = TransportReadComplete(rv);
}
return rv;
}
void SSLServerSocketOpenSSL::BufferRecvComplete(int result) {
result = TransportReadComplete(result);
OnRecvComplete(result);
}
int SSLServerSocketOpenSSL::TransportReadComplete(int result) {
DCHECK(ERR_IO_PENDING != result);
if (result <= 0) {
DVLOG(1) << "TransportReadComplete result " << result;
// Received 0 (end of file) or an error. Either way, bubble it up to the
// SSL layer via the BIO. TODO(joth): consider stashing the error code, to
// relay up to the SSL socket client (i.e. via DoReadCallback).
if (result == 0)
transport_recv_eof_ = true;
(void)BIO_shutdown_wr(transport_bio_);
} else if (transport_write_error_ < 0) {
// Mirror transport write errors as read failures; transport_bio_ has been
// shut down by TransportWriteComplete, so the BIO_write will fail, failing
// the CHECK. http://crbug.com/335557.
result = transport_write_error_;
} else {
DCHECK(recv_buffer_.get());
int ret = BIO_write(transport_bio_, recv_buffer_->data(), result);
// A write into a memory BIO should always succeed.
DCHECK_EQ(result, ret);
}
recv_buffer_ = NULL;
transport_recv_busy_ = false;
return result;
}
// Do as much network I/O as possible between the buffer and the
// transport socket. Return true if some I/O performed, false
// otherwise (error or ERR_IO_PENDING).
bool SSLServerSocketOpenSSL::DoTransportIO() {
bool network_moved = false;
int rv;
// Read and write as much data as possible. The loop is necessary because
// Write() may return synchronously.
do {
rv = BufferSend();
if (rv != ERR_IO_PENDING && rv != 0)
network_moved = true;
} while (rv > 0);
if (!transport_recv_eof_ && BufferRecv() != ERR_IO_PENDING)
network_moved = true;
return network_moved;
}
int SSLServerSocketOpenSSL::DoPayloadRead() {
DCHECK(user_read_buf_.get());
DCHECK_GT(user_read_buf_len_, 0);
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
int rv = SSL_read(ssl_, user_read_buf_->data(), user_read_buf_len_);
if (rv >= 0)
return rv;
int ssl_error = SSL_get_error(ssl_, rv);
OpenSSLErrorInfo error_info;
int net_error = MapOpenSSLErrorWithDetails(ssl_error, err_tracer,
&error_info);
if (net_error != ERR_IO_PENDING) {
net_log_.AddEvent(
NetLog::TYPE_SSL_READ_ERROR,
CreateNetLogOpenSSLErrorCallback(net_error, ssl_error, error_info));
}
return net_error;
}
int SSLServerSocketOpenSSL::DoPayloadWrite() {
DCHECK(user_write_buf_.get());
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
int rv = SSL_write(ssl_, user_write_buf_->data(), user_write_buf_len_);
if (rv >= 0)
return rv;
int ssl_error = SSL_get_error(ssl_, rv);
OpenSSLErrorInfo error_info;
int net_error = MapOpenSSLErrorWithDetails(ssl_error, err_tracer,
&error_info);
if (net_error != ERR_IO_PENDING) {
net_log_.AddEvent(
NetLog::TYPE_SSL_WRITE_ERROR,
CreateNetLogOpenSSLErrorCallback(net_error, ssl_error, error_info));
}
return net_error;
}
int SSLServerSocketOpenSSL::DoHandshakeLoop(int last_io_result) {
int rv = last_io_result;
do {
// Default to STATE_NONE for next state.
// (This is a quirk carried over from the windows
// implementation. It makes reading the logs a bit harder.)
// State handlers can and often do call GotoState just
// to stay in the current state.
State state = next_handshake_state_;
GotoState(STATE_NONE);
switch (state) {
case STATE_HANDSHAKE:
rv = DoHandshake();
break;
case STATE_NONE:
default:
rv = ERR_UNEXPECTED;
LOG(DFATAL) << "unexpected state " << state;
break;
}
// Do the actual network I/O
bool network_moved = DoTransportIO();
if (network_moved && next_handshake_state_ == STATE_HANDSHAKE) {
// In general we exit the loop if rv is ERR_IO_PENDING. In this
// special case we keep looping even if rv is ERR_IO_PENDING because
// the transport IO may allow DoHandshake to make progress.
rv = OK; // This causes us to stay in the loop.
}
} while (rv != ERR_IO_PENDING && next_handshake_state_ != STATE_NONE);
return rv;
}
int SSLServerSocketOpenSSL::DoReadLoop(int result) {
DCHECK(completed_handshake_);
DCHECK(next_handshake_state_ == STATE_NONE);
if (result < 0)
return result;
bool network_moved;
int rv;
do {
rv = DoPayloadRead();
network_moved = DoTransportIO();
} while (rv == ERR_IO_PENDING && network_moved);
return rv;
}
int SSLServerSocketOpenSSL::DoWriteLoop(int result) {
DCHECK(completed_handshake_);
DCHECK_EQ(next_handshake_state_, STATE_NONE);
if (result < 0)
return result;
bool network_moved;
int rv;
do {
rv = DoPayloadWrite();
network_moved = DoTransportIO();
} while (rv == ERR_IO_PENDING && network_moved);
return rv;
}
int SSLServerSocketOpenSSL::DoHandshake() {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
int net_error = OK;
int rv = SSL_do_handshake(ssl_);
if (rv == 1) {
completed_handshake_ = true;
} else {
int ssl_error = SSL_get_error(ssl_, rv);
OpenSSLErrorInfo error_info;
net_error = MapOpenSSLErrorWithDetails(ssl_error, err_tracer, &error_info);
// If not done, stay in this state
if (net_error == ERR_IO_PENDING) {
GotoState(STATE_HANDSHAKE);
} else {
LOG(ERROR) << "handshake failed; returned " << rv
<< ", SSL error code " << ssl_error
<< ", net_error " << net_error;
net_log_.AddEvent(
NetLog::TYPE_SSL_HANDSHAKE_ERROR,
CreateNetLogOpenSSLErrorCallback(net_error, ssl_error, error_info));
}
}
return net_error;
}
void SSLServerSocketOpenSSL::DoHandshakeCallback(int rv) {
DCHECK_NE(rv, ERR_IO_PENDING);
ResetAndReturn(&user_handshake_callback_).Run(rv > OK ? OK : rv);
}
void SSLServerSocketOpenSSL::DoReadCallback(int rv) {
DCHECK(rv != ERR_IO_PENDING);
DCHECK(!user_read_callback_.is_null());
user_read_buf_ = NULL;
user_read_buf_len_ = 0;
ResetAndReturn(&user_read_callback_).Run(rv);
}
void SSLServerSocketOpenSSL::DoWriteCallback(int rv) {
DCHECK(rv != ERR_IO_PENDING);
DCHECK(!user_write_callback_.is_null());
user_write_buf_ = NULL;
user_write_buf_len_ = 0;
ResetAndReturn(&user_write_callback_).Run(rv);
}
int SSLServerSocketOpenSSL::Init() {
DCHECK(!ssl_);
DCHECK(!transport_bio_);
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
ScopedSSL_CTX ssl_ctx(SSL_CTX_new(SSLv23_server_method()));
if (ssl_config_.require_client_cert)
SSL_CTX_set_verify(ssl_ctx.get(), SSL_VERIFY_PEER, NULL);
ssl_ = SSL_new(ssl_ctx.get());
if (!ssl_)
return ERR_UNEXPECTED;
BIO* ssl_bio = NULL;
// 0 => use default buffer sizes.
if (!BIO_new_bio_pair(&ssl_bio, 0, &transport_bio_, 0))
return ERR_UNEXPECTED;
DCHECK(ssl_bio);
DCHECK(transport_bio_);
SSL_set_bio(ssl_, ssl_bio, ssl_bio);
// Set certificate and private key.
DCHECK(cert_->os_cert_handle());
#if defined(USE_OPENSSL_CERTS)
if (SSL_use_certificate(ssl_, cert_->os_cert_handle()) != 1) {
LOG(ERROR) << "Cannot set certificate.";
return ERR_UNEXPECTED;
}
#else
// Convert OSCertHandle to X509 structure.
std::string der_string;
if (!X509Certificate::GetDEREncoded(cert_->os_cert_handle(), &der_string))
return ERR_UNEXPECTED;
const unsigned char* der_string_array =
reinterpret_cast<const unsigned char*>(der_string.data());
ScopedX509 x509(d2i_X509(NULL, &der_string_array, der_string.length()));
if (!x509.get())
return ERR_UNEXPECTED;
// On success, SSL_use_certificate acquires a reference to |x509|.
if (SSL_use_certificate(ssl_, x509.get()) != 1) {
LOG(ERROR) << "Cannot set certificate.";
return ERR_UNEXPECTED;
}
#endif // USE_OPENSSL_CERTS
DCHECK(key_->key());
if (SSL_use_PrivateKey(ssl_, key_->key()) != 1) {
LOG(ERROR) << "Cannot set private key.";
return ERR_UNEXPECTED;
}
DCHECK_LT(SSL3_VERSION, ssl_config_.version_min);
DCHECK_LT(SSL3_VERSION, ssl_config_.version_max);
SSL_set_min_version(ssl_, ssl_config_.version_min);
SSL_set_max_version(ssl_, ssl_config_.version_max);
// OpenSSL defaults some options to on, others to off. To avoid ambiguity,
// set everything we care about to an absolute value.
SslSetClearMask options;
options.ConfigureFlag(SSL_OP_NO_COMPRESSION, true);
SSL_set_options(ssl_, options.set_mask);
SSL_clear_options(ssl_, options.clear_mask);
// Same as above, this time for the SSL mode.
SslSetClearMask mode;
mode.ConfigureFlag(SSL_MODE_RELEASE_BUFFERS, true);
SSL_set_mode(ssl_, mode.set_mask);
SSL_clear_mode(ssl_, mode.clear_mask);
// See SSLServerConfig::disabled_cipher_suites for description of the suites
// disabled by default. Note that !SHA256 and !SHA384 only remove HMAC-SHA256
// and HMAC-SHA384 cipher suites, not GCM cipher suites with SHA256 or SHA384
// as the handshake hash.
std::string command("DEFAULT:!SHA256:!SHA384:!AESGCM+AES256:!aPSK");
if (ssl_config_.require_ecdhe)
command.append(":!kRSA:!kDHE");
// Remove any disabled ciphers.
for (uint16_t id : ssl_config_.disabled_cipher_suites) {
const SSL_CIPHER* cipher = SSL_get_cipher_by_value(id);
if (cipher) {
command.append(":!");
command.append(SSL_CIPHER_get_name(cipher));
}
}
int rv = SSL_set_cipher_list(ssl_, command.c_str());
// If this fails (rv = 0) it means there are no ciphers enabled on this SSL.
// This will almost certainly result in the socket failing to complete the
// handshake at which point the appropriate error is bubbled up to the client.
LOG_IF(WARNING, rv != 1) << "SSL_set_cipher_list('" << command
<< "') returned " << rv;
return OK;
}
} // namespace net
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