| /* |
| * 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 <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <time.h> |
| |
| #if defined(WEBRTC_WIN) |
| #include <windows.h> |
| #include <winsock2.h> |
| #include <ws2tcpip.h> |
| |
| #define SECURITY_WIN32 |
| #include <security.h> |
| #endif |
| |
| #include <algorithm> |
| |
| #include "rtc_base/buffer.h" |
| #include "rtc_base/bytebuffer.h" |
| #include "rtc_base/checks.h" |
| #include "rtc_base/httpcommon.h" |
| #include "rtc_base/logging.h" |
| #include "rtc_base/socketadapters.h" |
| #include "rtc_base/strings/string_builder.h" |
| #include "rtc_base/stringutils.h" |
| #include "rtc_base/zero_memory.h" |
| |
| namespace rtc { |
| |
| BufferedReadAdapter::BufferedReadAdapter(AsyncSocket* 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 |
| socket_->SetError(EWOULDBLOCK); |
| return -1; |
| } |
| return AsyncSocketAdapter::Send(pv, cb); |
| } |
| |
| int BufferedReadAdapter::Recv(void* pv, size_t cb, int64_t* timestamp) { |
| if (buffering_) { |
| socket_->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(AsyncSocket* socket) { |
| RTC_DCHECK(socket == socket_); |
| |
| if (!buffering_) { |
| AsyncSocketAdapter::OnReadEvent(socket); |
| return; |
| } |
| |
| if (data_len_ >= buffer_size_) { |
| RTC_LOG(LS_ERROR) << "Input buffer overflow"; |
| RTC_NOTREACHED(); |
| data_len_ = 0; |
| } |
| |
| int len = |
| socket_->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(INFO) << "Recv"; |
| return; |
| } |
| |
| data_len_ += len; |
| |
| ProcessInput(buffer_, &data_len_); |
| } |
| |
| AsyncProxyServerSocket::AsyncProxyServerSocket(AsyncSocket* socket, |
| size_t buffer_size) |
| : BufferedReadAdapter(socket, buffer_size) {} |
| |
| AsyncProxyServerSocket::~AsyncProxyServerSocket() = default; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // 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 // |
| }; |
| |
| // 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 |
| }; |
| |
| AsyncSSLSocket::AsyncSSLSocket(AsyncSocket* 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(AsyncSocket* socket) { |
| RTC_DCHECK(socket == socket_); |
| // TODO: we could buffer output too... |
| const int res = DirectSend(kSslClientHello, sizeof(kSslClientHello)); |
| RTC_DCHECK_EQ(sizeof(kSslClientHello), res); |
| } |
| |
| void AsyncSSLSocket::ProcessInput(char* data, size_t* len) { |
| if (*len < sizeof(kSslServerHello)) |
| return; |
| |
| if (memcmp(kSslServerHello, data, sizeof(kSslServerHello)) != 0) { |
| 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); |
| } |
| |
| AsyncSSLServerSocket::AsyncSSLServerSocket(AsyncSocket* socket) |
| : BufferedReadAdapter(socket, 1024) { |
| BufferInput(true); |
| } |
| |
| void AsyncSSLServerSocket::ProcessInput(char* data, size_t* len) { |
| // We only accept client hello messages. |
| if (*len < sizeof(kSslClientHello)) { |
| return; |
| } |
| |
| if (memcmp(kSslClientHello, data, sizeof(kSslClientHello)) != 0) { |
| Close(); |
| SignalCloseEvent(this, 0); |
| return; |
| } |
| |
| *len -= sizeof(kSslClientHello); |
| |
| // Clients should not send more data until the handshake is completed. |
| RTC_DCHECK(*len == 0); |
| |
| // Send a server hello back to the client. |
| DirectSend(kSslServerHello, sizeof(kSslServerHello)); |
| |
| // Handshake completed for us, redirect input to our parent. |
| BufferInput(false); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| AsyncHttpsProxySocket::AsyncHttpsProxySocket(AsyncSocket* socket, |
| const std::string& user_agent, |
| const SocketAddress& proxy, |
| const std::string& 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(AsyncSocket* socket) { |
| RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::OnConnectEvent"; |
| if (!ShouldIssueConnect()) { |
| state_ = PS_TUNNEL; |
| BufferedReadAdapter::OnConnectEvent(socket); |
| return; |
| } |
| SendRequest(); |
| } |
| |
| void AsyncHttpsProxySocket::OnCloseEvent(AsyncSocket* 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 len = pos - start - 1; |
| if ((len > 0) && (data[start + len - 1] == '\r')) |
| --len; |
| |
| data[start + len] = 0; |
| ProcessLine(data + start, len); |
| 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 { |
| static bool report = false; |
| if (!unknown_mechanisms_.empty() && !report) { |
| report = true; |
| std::string msg( |
| "Unable to connect to the Google Talk service due to an " |
| "incompatibility " |
| "with your proxy.\r\nPlease help us resolve this issue by " |
| "submitting the " |
| "following information to us using our technical issue submission " |
| "form " |
| "at:\r\n\r\n" |
| "http://www.google.com/support/talk/bin/request.py\r\n\r\n" |
| "We apologize for the inconvenience.\r\n\r\n" |
| "Information to submit to Google: "); |
| // std::string msg("Please report the following information to |
| // foo@bar.com:\r\nUnknown methods: "); |
| msg.append(unknown_mechanisms_); |
| #if defined(WEBRTC_WIN) |
| MessageBoxA(0, msg.c_str(), "Oops!", MB_OK); |
| #endif |
| #if defined(WEBRTC_POSIX) |
| // TODO: Raise a signal so the UI can be separated. |
| RTC_LOG(LS_ERROR) << "Oops!\n\n" << msg; |
| #endif |
| } |
| // 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) && |
| (_strnicmp(data, "Proxy-Authenticate:", 19) == 0)) { |
| std::string response, auth_method; |
| switch (HttpAuthenticate(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 (_strnicmp(data, "Content-Length:", 15) == 0) { |
| content_length_ = strtoul(data + 15, 0, 0); |
| } else if (_strnicmp(data, "Proxy-Connection: Keep-Alive", 28) == 0) { |
| expect_close_ = false; |
| /* |
| } else if (_strnicmp(data, "Connection: close", 17) == 0) { |
| 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(AsyncSocket* socket, |
| const SocketAddress& proxy, |
| const std::string& 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(AsyncSocket* 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 len; |
| std::string addr; |
| if (!response.ReadUInt8(&len) || !response.ReadString(&addr, len) || |
| !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); |
| } |
| |
| AsyncSocksProxyServerSocket::AsyncSocksProxyServerSocket(AsyncSocket* socket) |
| : AsyncProxyServerSocket(socket, kBufferSize), state_(SS_HELLO) { |
| BufferInput(true); |
| } |
| |
| void AsyncSocksProxyServerSocket::ProcessInput(char* data, size_t* len) { |
| // TODO: See if the whole message has arrived |
| RTC_DCHECK(state_ < SS_CONNECT_PENDING); |
| |
| ByteBufferReader response(data, *len); |
| if (state_ == SS_HELLO) { |
| HandleHello(&response); |
| } else if (state_ == SS_AUTH) { |
| HandleAuth(&response); |
| } else if (state_ == SS_CONNECT) { |
| HandleConnect(&response); |
| } |
| |
| // Consume parsed data |
| *len = response.Length(); |
| memmove(data, response.Data(), *len); |
| } |
| |
| void AsyncSocksProxyServerSocket::DirectSend(const ByteBufferWriter& buf) { |
| BufferedReadAdapter::DirectSend(buf.Data(), buf.Length()); |
| } |
| |
| void AsyncSocksProxyServerSocket::HandleHello(ByteBufferReader* request) { |
| uint8_t ver, num_methods; |
| if (!request->ReadUInt8(&ver) || !request->ReadUInt8(&num_methods)) { |
| Error(0); |
| return; |
| } |
| |
| if (ver != 5) { |
| Error(0); |
| return; |
| } |
| |
| // Handle either no-auth (0) or user/pass auth (2) |
| uint8_t method = 0xFF; |
| if (num_methods > 0 && !request->ReadUInt8(&method)) { |
| Error(0); |
| return; |
| } |
| |
| // TODO: Ask the server which method to use. |
| SendHelloReply(method); |
| if (method == 0) { |
| state_ = SS_CONNECT; |
| } else if (method == 2) { |
| state_ = SS_AUTH; |
| } else { |
| state_ = SS_ERROR; |
| } |
| } |
| |
| void AsyncSocksProxyServerSocket::SendHelloReply(uint8_t method) { |
| ByteBufferWriter response; |
| response.WriteUInt8(5); // Socks Version |
| response.WriteUInt8(method); // Auth method |
| DirectSend(response); |
| } |
| |
| void AsyncSocksProxyServerSocket::HandleAuth(ByteBufferReader* request) { |
| uint8_t ver, user_len, pass_len; |
| std::string user, pass; |
| if (!request->ReadUInt8(&ver) || !request->ReadUInt8(&user_len) || |
| !request->ReadString(&user, user_len) || !request->ReadUInt8(&pass_len) || |
| !request->ReadString(&pass, pass_len)) { |
| Error(0); |
| return; |
| } |
| |
| // TODO: Allow for checking of credentials. |
| SendAuthReply(0); |
| state_ = SS_CONNECT; |
| } |
| |
| void AsyncSocksProxyServerSocket::SendAuthReply(uint8_t result) { |
| ByteBufferWriter response; |
| response.WriteUInt8(1); // Negotiation Version |
| response.WriteUInt8(result); |
| DirectSend(response); |
| } |
| |
| void AsyncSocksProxyServerSocket::HandleConnect(ByteBufferReader* request) { |
| uint8_t ver, command, reserved, addr_type; |
| uint32_t ip; |
| uint16_t port; |
| if (!request->ReadUInt8(&ver) || !request->ReadUInt8(&command) || |
| !request->ReadUInt8(&reserved) || !request->ReadUInt8(&addr_type) || |
| !request->ReadUInt32(&ip) || !request->ReadUInt16(&port)) { |
| Error(0); |
| return; |
| } |
| |
| if (ver != 5 || command != 1 || reserved != 0 || addr_type != 1) { |
| Error(0); |
| return; |
| } |
| |
| SignalConnectRequest(this, SocketAddress(ip, port)); |
| state_ = SS_CONNECT_PENDING; |
| } |
| |
| void AsyncSocksProxyServerSocket::SendConnectResult(int result, |
| const SocketAddress& addr) { |
| if (state_ != SS_CONNECT_PENDING) |
| return; |
| |
| ByteBufferWriter response; |
| response.WriteUInt8(5); // Socks version |
| response.WriteUInt8((result != 0)); // 0x01 is generic error |
| response.WriteUInt8(0); // reserved |
| response.WriteUInt8(1); // IPv4 address |
| response.WriteUInt32(addr.ip()); |
| response.WriteUInt16(addr.port()); |
| DirectSend(response); |
| BufferInput(false); |
| state_ = SS_TUNNEL; |
| } |
| |
| void AsyncSocksProxyServerSocket::Error(int error) { |
| state_ = SS_ERROR; |
| BufferInput(false); |
| Close(); |
| SetError(SOCKET_EACCES); |
| SignalCloseEvent(this, error); |
| } |
| |
| } // namespace rtc |