| /* |
| * 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); |
| } |
| |
| } // namespace rtc |
