diff options
Diffstat (limited to 'third_party/libwebrtc/rtc_base/socket_adapters.cc')
| -rw-r--r-- | third_party/libwebrtc/rtc_base/socket_adapters.cc | 665 |
1 files changed, 665 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/socket_adapters.cc b/third_party/libwebrtc/rtc_base/socket_adapters.cc new file mode 100644 index 0000000000..4ec93ae3e9 --- /dev/null +++ b/third_party/libwebrtc/rtc_base/socket_adapters.cc @@ -0,0 +1,665 @@ +/* + * Copyright 2004 The WebRTC Project Authors. All rights reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#if defined(_MSC_VER) && _MSC_VER < 1300 +#pragma warning(disable : 4786) +#endif + +#include "rtc_base/socket_adapters.h" + +#include <algorithm> + +#include "absl/strings/match.h" +#include "absl/strings/string_view.h" +#include "rtc_base/buffer.h" +#include "rtc_base/byte_buffer.h" +#include "rtc_base/checks.h" +#include "rtc_base/http_common.h" +#include "rtc_base/logging.h" +#include "rtc_base/strings/string_builder.h" +#include "rtc_base/zero_memory.h" + +namespace rtc { + +BufferedReadAdapter::BufferedReadAdapter(Socket* socket, size_t size) + : AsyncSocketAdapter(socket), + buffer_size_(size), + data_len_(0), + buffering_(false) { + buffer_ = new char[buffer_size_]; +} + +BufferedReadAdapter::~BufferedReadAdapter() { + delete[] buffer_; +} + +int BufferedReadAdapter::Send(const void* pv, size_t cb) { + if (buffering_) { + // TODO: Spoof error better; Signal Writeable + SetError(EWOULDBLOCK); + return -1; + } + return AsyncSocketAdapter::Send(pv, cb); +} + +int BufferedReadAdapter::Recv(void* pv, size_t cb, int64_t* timestamp) { + if (buffering_) { + SetError(EWOULDBLOCK); + return -1; + } + + size_t read = 0; + + if (data_len_) { + read = std::min(cb, data_len_); + memcpy(pv, buffer_, read); + data_len_ -= read; + if (data_len_ > 0) { + memmove(buffer_, buffer_ + read, data_len_); + } + pv = static_cast<char*>(pv) + read; + cb -= read; + } + + // FIX: If cb == 0, we won't generate another read event + + int res = AsyncSocketAdapter::Recv(pv, cb, timestamp); + if (res >= 0) { + // Read from socket and possibly buffer; return combined length + return res + static_cast<int>(read); + } + + if (read > 0) { + // Failed to read from socket, but still read something from buffer + return static_cast<int>(read); + } + + // Didn't read anything; return error from socket + return res; +} + +void BufferedReadAdapter::BufferInput(bool on) { + buffering_ = on; +} + +void BufferedReadAdapter::OnReadEvent(Socket* socket) { + RTC_DCHECK(socket == GetSocket()); + + if (!buffering_) { + AsyncSocketAdapter::OnReadEvent(socket); + return; + } + + if (data_len_ >= buffer_size_) { + RTC_LOG(LS_ERROR) << "Input buffer overflow"; + RTC_DCHECK_NOTREACHED(); + data_len_ = 0; + } + + int len = AsyncSocketAdapter::Recv(buffer_ + data_len_, + buffer_size_ - data_len_, nullptr); + if (len < 0) { + // TODO: Do something better like forwarding the error to the user. + RTC_LOG_ERR(LS_INFO) << "Recv"; + return; + } + + data_len_ += len; + + ProcessInput(buffer_, &data_len_); +} + +/////////////////////////////////////////////////////////////////////////////// + +// This is a SSL v2 CLIENT_HELLO message. +// TODO: Should this have a session id? The response doesn't have a +// certificate, so the hello should have a session id. +static const uint8_t kSslClientHello[] = { + 0x80, 0x46, // msg len + 0x01, // CLIENT_HELLO + 0x03, 0x01, // SSL 3.1 + 0x00, 0x2d, // ciphersuite len + 0x00, 0x00, // session id len + 0x00, 0x10, // challenge len + 0x01, 0x00, 0x80, 0x03, 0x00, 0x80, 0x07, 0x00, 0xc0, // ciphersuites + 0x06, 0x00, 0x40, 0x02, 0x00, 0x80, 0x04, 0x00, 0x80, // + 0x00, 0x00, 0x04, 0x00, 0xfe, 0xff, 0x00, 0x00, 0x0a, // + 0x00, 0xfe, 0xfe, 0x00, 0x00, 0x09, 0x00, 0x00, 0x64, // + 0x00, 0x00, 0x62, 0x00, 0x00, 0x03, 0x00, 0x00, 0x06, // + 0x1f, 0x17, 0x0c, 0xa6, 0x2f, 0x00, 0x78, 0xfc, // challenge + 0x46, 0x55, 0x2e, 0xb1, 0x83, 0x39, 0xf1, 0xea // +}; + +// static +ArrayView<const uint8_t> AsyncSSLSocket::SslClientHello() { + // Implicit conversion directly from kSslClientHello to ArrayView fails when + // built with gcc. + return {kSslClientHello, sizeof(kSslClientHello)}; +} + +// This is a TLSv1 SERVER_HELLO message. +static const uint8_t kSslServerHello[] = { + 0x16, // handshake message + 0x03, 0x01, // SSL 3.1 + 0x00, 0x4a, // message len + 0x02, // SERVER_HELLO + 0x00, 0x00, 0x46, // handshake len + 0x03, 0x01, // SSL 3.1 + 0x42, 0x85, 0x45, 0xa7, 0x27, 0xa9, 0x5d, 0xa0, // server random + 0xb3, 0xc5, 0xe7, 0x53, 0xda, 0x48, 0x2b, 0x3f, // + 0xc6, 0x5a, 0xca, 0x89, 0xc1, 0x58, 0x52, 0xa1, // + 0x78, 0x3c, 0x5b, 0x17, 0x46, 0x00, 0x85, 0x3f, // + 0x20, // session id len + 0x0e, 0xd3, 0x06, 0x72, 0x5b, 0x5b, 0x1b, 0x5f, // session id + 0x15, 0xac, 0x13, 0xf9, 0x88, 0x53, 0x9d, 0x9b, // + 0xe8, 0x3d, 0x7b, 0x0c, 0x30, 0x32, 0x6e, 0x38, // + 0x4d, 0xa2, 0x75, 0x57, 0x41, 0x6c, 0x34, 0x5c, // + 0x00, 0x04, // RSA/RC4-128/MD5 + 0x00 // null compression +}; + +// static +ArrayView<const uint8_t> AsyncSSLSocket::SslServerHello() { + return {kSslServerHello, sizeof(kSslServerHello)}; +} + +AsyncSSLSocket::AsyncSSLSocket(Socket* socket) + : BufferedReadAdapter(socket, 1024) {} + +int AsyncSSLSocket::Connect(const SocketAddress& addr) { + // Begin buffering before we connect, so that there isn't a race condition + // between potential senders and receiving the OnConnectEvent signal + BufferInput(true); + return BufferedReadAdapter::Connect(addr); +} + +void AsyncSSLSocket::OnConnectEvent(Socket* socket) { + RTC_DCHECK(socket == GetSocket()); + // TODO: we could buffer output too... + const int res = DirectSend(kSslClientHello, sizeof(kSslClientHello)); + if (res != sizeof(kSslClientHello)) { + RTC_LOG(LS_ERROR) << "Sending fake SSL ClientHello message failed."; + Close(); + SignalCloseEvent(this, 0); + } +} + +void AsyncSSLSocket::ProcessInput(char* data, size_t* len) { + if (*len < sizeof(kSslServerHello)) + return; + + if (memcmp(kSslServerHello, data, sizeof(kSslServerHello)) != 0) { + RTC_LOG(LS_ERROR) << "Received non-matching fake SSL ServerHello message."; + Close(); + SignalCloseEvent(this, 0); // TODO: error code? + return; + } + + *len -= sizeof(kSslServerHello); + if (*len > 0) { + memmove(data, data + sizeof(kSslServerHello), *len); + } + + bool remainder = (*len > 0); + BufferInput(false); + SignalConnectEvent(this); + + // FIX: if SignalConnect causes the socket to be destroyed, we are in trouble + if (remainder) + SignalReadEvent(this); +} + +/////////////////////////////////////////////////////////////////////////////// + +AsyncHttpsProxySocket::AsyncHttpsProxySocket(Socket* socket, + absl::string_view user_agent, + const SocketAddress& proxy, + absl::string_view username, + const CryptString& password) + : BufferedReadAdapter(socket, 1024), + proxy_(proxy), + agent_(user_agent), + user_(username), + pass_(password), + force_connect_(false), + state_(PS_ERROR), + context_(0) {} + +AsyncHttpsProxySocket::~AsyncHttpsProxySocket() { + delete context_; +} + +int AsyncHttpsProxySocket::Connect(const SocketAddress& addr) { + int ret; + RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::Connect(" + << proxy_.ToSensitiveString() << ")"; + dest_ = addr; + state_ = PS_INIT; + if (ShouldIssueConnect()) { + BufferInput(true); + } + ret = BufferedReadAdapter::Connect(proxy_); + // TODO: Set state_ appropriately if Connect fails. + return ret; +} + +SocketAddress AsyncHttpsProxySocket::GetRemoteAddress() const { + return dest_; +} + +int AsyncHttpsProxySocket::Close() { + headers_.clear(); + state_ = PS_ERROR; + dest_.Clear(); + delete context_; + context_ = nullptr; + return BufferedReadAdapter::Close(); +} + +Socket::ConnState AsyncHttpsProxySocket::GetState() const { + if (state_ < PS_TUNNEL) { + return CS_CONNECTING; + } else if (state_ == PS_TUNNEL) { + return CS_CONNECTED; + } else { + return CS_CLOSED; + } +} + +void AsyncHttpsProxySocket::OnConnectEvent(Socket* socket) { + RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::OnConnectEvent"; + if (!ShouldIssueConnect()) { + state_ = PS_TUNNEL; + BufferedReadAdapter::OnConnectEvent(socket); + return; + } + SendRequest(); +} + +void AsyncHttpsProxySocket::OnCloseEvent(Socket* socket, int err) { + RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::OnCloseEvent(" << err << ")"; + if ((state_ == PS_WAIT_CLOSE) && (err == 0)) { + state_ = PS_ERROR; + Connect(dest_); + } else { + BufferedReadAdapter::OnCloseEvent(socket, err); + } +} + +void AsyncHttpsProxySocket::ProcessInput(char* data, size_t* len) { + size_t start = 0; + for (size_t pos = start; state_ < PS_TUNNEL && pos < *len;) { + if (state_ == PS_SKIP_BODY) { + size_t consume = std::min(*len - pos, content_length_); + pos += consume; + start = pos; + content_length_ -= consume; + if (content_length_ == 0) { + EndResponse(); + } + continue; + } + + if (data[pos++] != '\n') + continue; + + size_t length = pos - start - 1; + if ((length > 0) && (data[start + length - 1] == '\r')) + --length; + + data[start + length] = 0; + ProcessLine(data + start, length); + start = pos; + } + + *len -= start; + if (*len > 0) { + memmove(data, data + start, *len); + } + + if (state_ != PS_TUNNEL) + return; + + bool remainder = (*len > 0); + BufferInput(false); + SignalConnectEvent(this); + + // FIX: if SignalConnect causes the socket to be destroyed, we are in trouble + if (remainder) + SignalReadEvent(this); // TODO: signal this?? +} + +bool AsyncHttpsProxySocket::ShouldIssueConnect() const { + // TODO: Think about whether a more sophisticated test + // than dest port == 80 is needed. + return force_connect_ || (dest_.port() != 80); +} + +void AsyncHttpsProxySocket::SendRequest() { + rtc::StringBuilder ss; + ss << "CONNECT " << dest_.ToString() << " HTTP/1.0\r\n"; + ss << "User-Agent: " << agent_ << "\r\n"; + ss << "Host: " << dest_.HostAsURIString() << "\r\n"; + ss << "Content-Length: 0\r\n"; + ss << "Proxy-Connection: Keep-Alive\r\n"; + ss << headers_; + ss << "\r\n"; + std::string str = ss.str(); + DirectSend(str.c_str(), str.size()); + state_ = PS_LEADER; + expect_close_ = true; + content_length_ = 0; + headers_.clear(); + + RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket >> " << str; +} + +void AsyncHttpsProxySocket::ProcessLine(char* data, size_t len) { + RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket << " << data; + + if (len == 0) { + if (state_ == PS_TUNNEL_HEADERS) { + state_ = PS_TUNNEL; + } else if (state_ == PS_ERROR_HEADERS) { + Error(defer_error_); + return; + } else if (state_ == PS_SKIP_HEADERS) { + if (content_length_) { + state_ = PS_SKIP_BODY; + } else { + EndResponse(); + return; + } + } else { + if (!unknown_mechanisms_.empty()) { + RTC_LOG(LS_ERROR) << "Unsupported authentication methods: " + << unknown_mechanisms_; + } + // Unexpected end of headers + Error(0); + return; + } + } else if (state_ == PS_LEADER) { + unsigned int code; + if (sscanf(data, "HTTP/%*u.%*u %u", &code) != 1) { + Error(0); + return; + } + switch (code) { + case 200: + // connection good! + state_ = PS_TUNNEL_HEADERS; + return; +#if defined(HTTP_STATUS_PROXY_AUTH_REQ) && (HTTP_STATUS_PROXY_AUTH_REQ != 407) +#error Wrong code for HTTP_STATUS_PROXY_AUTH_REQ +#endif + case 407: // HTTP_STATUS_PROXY_AUTH_REQ + state_ = PS_AUTHENTICATE; + return; + default: + defer_error_ = 0; + state_ = PS_ERROR_HEADERS; + return; + } + } else if ((state_ == PS_AUTHENTICATE) && + absl::StartsWithIgnoreCase(data, "Proxy-Authenticate:")) { + std::string response, auth_method; + switch (HttpAuthenticate(absl::string_view(data + 19, len - 19), proxy_, + "CONNECT", "/", user_, pass_, context_, response, + auth_method)) { + case HAR_IGNORE: + RTC_LOG(LS_VERBOSE) << "Ignoring Proxy-Authenticate: " << auth_method; + if (!unknown_mechanisms_.empty()) + unknown_mechanisms_.append(", "); + unknown_mechanisms_.append(auth_method); + break; + case HAR_RESPONSE: + headers_ = "Proxy-Authorization: "; + headers_.append(response); + headers_.append("\r\n"); + state_ = PS_SKIP_HEADERS; + unknown_mechanisms_.clear(); + break; + case HAR_CREDENTIALS: + defer_error_ = SOCKET_EACCES; + state_ = PS_ERROR_HEADERS; + unknown_mechanisms_.clear(); + break; + case HAR_ERROR: + defer_error_ = 0; + state_ = PS_ERROR_HEADERS; + unknown_mechanisms_.clear(); + break; + } + } else if (absl::StartsWithIgnoreCase(data, "Content-Length:")) { + content_length_ = strtoul(data + 15, 0, 0); + } else if (absl::StartsWithIgnoreCase(data, "Proxy-Connection: Keep-Alive")) { + expect_close_ = false; + /* + } else if (absl::StartsWithIgnoreCase(data, "Connection: close") { + expect_close_ = true; + */ + } +} + +void AsyncHttpsProxySocket::EndResponse() { + if (!expect_close_) { + SendRequest(); + return; + } + + // No point in waiting for the server to close... let's close now + // TODO: Refactor out PS_WAIT_CLOSE + state_ = PS_WAIT_CLOSE; + BufferedReadAdapter::Close(); + OnCloseEvent(this, 0); +} + +void AsyncHttpsProxySocket::Error(int error) { + BufferInput(false); + Close(); + SetError(error); + SignalCloseEvent(this, error); +} + +/////////////////////////////////////////////////////////////////////////////// + +AsyncSocksProxySocket::AsyncSocksProxySocket(Socket* socket, + const SocketAddress& proxy, + absl::string_view username, + const CryptString& password) + : BufferedReadAdapter(socket, 1024), + state_(SS_ERROR), + proxy_(proxy), + user_(username), + pass_(password) {} + +AsyncSocksProxySocket::~AsyncSocksProxySocket() = default; + +int AsyncSocksProxySocket::Connect(const SocketAddress& addr) { + int ret; + dest_ = addr; + state_ = SS_INIT; + BufferInput(true); + ret = BufferedReadAdapter::Connect(proxy_); + // TODO: Set state_ appropriately if Connect fails. + return ret; +} + +SocketAddress AsyncSocksProxySocket::GetRemoteAddress() const { + return dest_; +} + +int AsyncSocksProxySocket::Close() { + state_ = SS_ERROR; + dest_.Clear(); + return BufferedReadAdapter::Close(); +} + +Socket::ConnState AsyncSocksProxySocket::GetState() const { + if (state_ < SS_TUNNEL) { + return CS_CONNECTING; + } else if (state_ == SS_TUNNEL) { + return CS_CONNECTED; + } else { + return CS_CLOSED; + } +} + +void AsyncSocksProxySocket::OnConnectEvent(Socket* socket) { + SendHello(); +} + +void AsyncSocksProxySocket::ProcessInput(char* data, size_t* len) { + RTC_DCHECK(state_ < SS_TUNNEL); + + ByteBufferReader response(data, *len); + + if (state_ == SS_HELLO) { + uint8_t ver, method; + if (!response.ReadUInt8(&ver) || !response.ReadUInt8(&method)) + return; + + if (ver != 5) { + Error(0); + return; + } + + if (method == 0) { + SendConnect(); + } else if (method == 2) { + SendAuth(); + } else { + Error(0); + return; + } + } else if (state_ == SS_AUTH) { + uint8_t ver, status; + if (!response.ReadUInt8(&ver) || !response.ReadUInt8(&status)) + return; + + if ((ver != 1) || (status != 0)) { + Error(SOCKET_EACCES); + return; + } + + SendConnect(); + } else if (state_ == SS_CONNECT) { + uint8_t ver, rep, rsv, atyp; + if (!response.ReadUInt8(&ver) || !response.ReadUInt8(&rep) || + !response.ReadUInt8(&rsv) || !response.ReadUInt8(&atyp)) + return; + + if ((ver != 5) || (rep != 0)) { + Error(0); + return; + } + + uint16_t port; + if (atyp == 1) { + uint32_t addr; + if (!response.ReadUInt32(&addr) || !response.ReadUInt16(&port)) + return; + RTC_LOG(LS_VERBOSE) << "Bound on " << addr << ":" << port; + } else if (atyp == 3) { + uint8_t length; + std::string addr; + if (!response.ReadUInt8(&length) || !response.ReadString(&addr, length) || + !response.ReadUInt16(&port)) + return; + RTC_LOG(LS_VERBOSE) << "Bound on " << addr << ":" << port; + } else if (atyp == 4) { + std::string addr; + if (!response.ReadString(&addr, 16) || !response.ReadUInt16(&port)) + return; + RTC_LOG(LS_VERBOSE) << "Bound on <IPV6>:" << port; + } else { + Error(0); + return; + } + + state_ = SS_TUNNEL; + } + + // Consume parsed data + *len = response.Length(); + memmove(data, response.Data(), *len); + + if (state_ != SS_TUNNEL) + return; + + bool remainder = (*len > 0); + BufferInput(false); + SignalConnectEvent(this); + + // FIX: if SignalConnect causes the socket to be destroyed, we are in trouble + if (remainder) + SignalReadEvent(this); // TODO: signal this?? +} + +void AsyncSocksProxySocket::SendHello() { + ByteBufferWriter request; + request.WriteUInt8(5); // Socks Version + if (user_.empty()) { + request.WriteUInt8(1); // Authentication Mechanisms + request.WriteUInt8(0); // No authentication + } else { + request.WriteUInt8(2); // Authentication Mechanisms + request.WriteUInt8(0); // No authentication + request.WriteUInt8(2); // Username/Password + } + DirectSend(request.Data(), request.Length()); + state_ = SS_HELLO; +} + +void AsyncSocksProxySocket::SendAuth() { + ByteBufferWriterT<ZeroOnFreeBuffer<char>> request; + request.WriteUInt8(1); // Negotiation Version + request.WriteUInt8(static_cast<uint8_t>(user_.size())); + request.WriteString(user_); // Username + request.WriteUInt8(static_cast<uint8_t>(pass_.GetLength())); + size_t len = pass_.GetLength() + 1; + char* sensitive = new char[len]; + pass_.CopyTo(sensitive, true); + request.WriteBytes(sensitive, pass_.GetLength()); // Password + ExplicitZeroMemory(sensitive, len); + delete[] sensitive; + DirectSend(request.Data(), request.Length()); + state_ = SS_AUTH; +} + +void AsyncSocksProxySocket::SendConnect() { + ByteBufferWriter request; + request.WriteUInt8(5); // Socks Version + request.WriteUInt8(1); // CONNECT + request.WriteUInt8(0); // Reserved + if (dest_.IsUnresolvedIP()) { + std::string hostname = dest_.hostname(); + request.WriteUInt8(3); // DOMAINNAME + request.WriteUInt8(static_cast<uint8_t>(hostname.size())); + request.WriteString(hostname); // Destination Hostname + } else { + request.WriteUInt8(1); // IPV4 + request.WriteUInt32(dest_.ip()); // Destination IP + } + request.WriteUInt16(dest_.port()); // Destination Port + DirectSend(request.Data(), request.Length()); + state_ = SS_CONNECT; +} + +void AsyncSocksProxySocket::Error(int error) { + state_ = SS_ERROR; + BufferInput(false); + Close(); + SetError(SOCKET_EACCES); + SignalCloseEvent(this, error); +} + +} // namespace rtc |