1 files changed, 0 insertions, 280 deletions
diff --git a/third_party/libwebrtc/pc/srtp_filter.cc b/third_party/libwebrtc/pc/srtp_filter.cc
deleted file mode 100644
index b8be63cd22..0000000000
--- a/third_party/libwebrtc/pc/srtp_filter.cc
+++ /dev/null
@@ -1,280 +0,0 @@
-/*
- *  Copyright 2009 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.
- */
-
-#include "pc/srtp_filter.h"
-
-#include <string.h>
-
-#include <string>
-
-#include "absl/strings/match.h"
-#include "rtc_base/logging.h"
-#include "rtc_base/ssl_stream_adapter.h"
-#include "rtc_base/third_party/base64/base64.h"
-#include "rtc_base/zero_memory.h"
-
-namespace cricket {
-
-SrtpFilter::SrtpFilter() {}
-
-SrtpFilter::~SrtpFilter() {}
-
-bool SrtpFilter::IsActive() const {
-  return state_ >= ST_ACTIVE;
-}
-
-bool SrtpFilter::Process(const std::vector<CryptoParams>& cryptos,
-                         webrtc::SdpType type,
-                         ContentSource source) {
-  bool ret = false;
-  switch (type) {
-    case webrtc::SdpType::kOffer:
-      ret = SetOffer(cryptos, source);
-      break;
-    case webrtc::SdpType::kPrAnswer:
-      ret = SetProvisionalAnswer(cryptos, source);
-      break;
-    case webrtc::SdpType::kAnswer:
-      ret = SetAnswer(cryptos, source);
-      break;
-    default:
-      break;
-  }
-
-  if (!ret) {
-    return false;
-  }
-
-  return true;
-}
-
-bool SrtpFilter::SetOffer(const std::vector<CryptoParams>& offer_params,
-                          ContentSource source) {
-  if (!ExpectOffer(source)) {
-    RTC_LOG(LS_ERROR) << "Wrong state to update SRTP offer";
-    return false;
-  }
-  return StoreParams(offer_params, source);
-}
-
-bool SrtpFilter::SetAnswer(const std::vector<CryptoParams>& answer_params,
-                           ContentSource source) {
-  return DoSetAnswer(answer_params, source, true);
-}
-
-bool SrtpFilter::SetProvisionalAnswer(
-    const std::vector<CryptoParams>& answer_params,
-    ContentSource source) {
-  return DoSetAnswer(answer_params, source, false);
-}
-
-bool SrtpFilter::ExpectOffer(ContentSource source) {
-  return ((state_ == ST_INIT) || (state_ == ST_ACTIVE) ||
-          (state_ == ST_SENTOFFER && source == CS_LOCAL) ||
-          (state_ == ST_SENTUPDATEDOFFER && source == CS_LOCAL) ||
-          (state_ == ST_RECEIVEDOFFER && source == CS_REMOTE) ||
-          (state_ == ST_RECEIVEDUPDATEDOFFER && source == CS_REMOTE));
-}
-
-bool SrtpFilter::StoreParams(const std::vector<CryptoParams>& params,
-                             ContentSource source) {
-  offer_params_ = params;
-  if (state_ == ST_INIT) {
-    state_ = (source == CS_LOCAL) ? ST_SENTOFFER : ST_RECEIVEDOFFER;
-  } else if (state_ == ST_ACTIVE) {
-    state_ =
-        (source == CS_LOCAL) ? ST_SENTUPDATEDOFFER : ST_RECEIVEDUPDATEDOFFER;
-  }
-  return true;
-}
-
-bool SrtpFilter::ExpectAnswer(ContentSource source) {
-  return ((state_ == ST_SENTOFFER && source == CS_REMOTE) ||
-          (state_ == ST_RECEIVEDOFFER && source == CS_LOCAL) ||
-          (state_ == ST_SENTUPDATEDOFFER && source == CS_REMOTE) ||
-          (state_ == ST_RECEIVEDUPDATEDOFFER && source == CS_LOCAL) ||
-          (state_ == ST_SENTPRANSWER_NO_CRYPTO && source == CS_LOCAL) ||
-          (state_ == ST_SENTPRANSWER && source == CS_LOCAL) ||
-          (state_ == ST_RECEIVEDPRANSWER_NO_CRYPTO && source == CS_REMOTE) ||
-          (state_ == ST_RECEIVEDPRANSWER && source == CS_REMOTE));
-}
-
-bool SrtpFilter::DoSetAnswer(const std::vector<CryptoParams>& answer_params,
-                             ContentSource source,
-                             bool final) {
-  if (!ExpectAnswer(source)) {
-    RTC_LOG(LS_ERROR) << "Invalid state for SRTP answer";
-    return false;
-  }
-
-  // If the answer doesn't requests crypto complete the negotiation of an
-  // unencrypted session.
-  // Otherwise, finalize the parameters and apply them.
-  if (answer_params.empty()) {
-    if (final) {
-      return ResetParams();
-    } else {
-      // Need to wait for the final answer to decide if
-      // we should go to Active state.
-      state_ = (source == CS_LOCAL) ? ST_SENTPRANSWER_NO_CRYPTO
-                                    : ST_RECEIVEDPRANSWER_NO_CRYPTO;
-      return true;
-    }
-  }
-  CryptoParams selected_params;
-  if (!NegotiateParams(answer_params, &selected_params))
-    return false;
-
-  const CryptoParams& new_send_params =
-      (source == CS_REMOTE) ? selected_params : answer_params[0];
-  const CryptoParams& new_recv_params =
-      (source == CS_REMOTE) ? answer_params[0] : selected_params;
-  if (!ApplySendParams(new_send_params) || !ApplyRecvParams(new_recv_params)) {
-    return false;
-  }
-  applied_send_params_ = new_send_params;
-  applied_recv_params_ = new_recv_params;
-
-  if (final) {
-    offer_params_.clear();
-    state_ = ST_ACTIVE;
-  } else {
-    state_ = (source == CS_LOCAL) ? ST_SENTPRANSWER : ST_RECEIVEDPRANSWER;
-  }
-  return true;
-}
-
-bool SrtpFilter::NegotiateParams(const std::vector<CryptoParams>& answer_params,
-                                 CryptoParams* selected_params) {
-  // We're processing an accept. We should have exactly one set of params,
-  // unless the offer didn't mention crypto, in which case we shouldn't be here.
-  bool ret = (answer_params.size() == 1U && !offer_params_.empty());
-  if (ret) {
-    // We should find a match between the answer params and the offered params.
-    std::vector<CryptoParams>::const_iterator it;
-    for (it = offer_params_.begin(); it != offer_params_.end(); ++it) {
-      if (answer_params[0].Matches(*it)) {
-        break;
-      }
-    }
-
-    if (it != offer_params_.end()) {
-      *selected_params = *it;
-    } else {
-      ret = false;
-    }
-  }
-
-  if (!ret) {
-    RTC_LOG(LS_WARNING) << "Invalid parameters in SRTP answer";
-  }
-  return ret;
-}
-
-bool SrtpFilter::ResetParams() {
-  offer_params_.clear();
-  applied_send_params_ = CryptoParams();
-  applied_recv_params_ = CryptoParams();
-  send_crypto_suite_ = absl::nullopt;
-  recv_crypto_suite_ = absl::nullopt;
-  send_key_.Clear();
-  recv_key_.Clear();
-  state_ = ST_INIT;
-  return true;
-}
-
-bool SrtpFilter::ApplySendParams(const CryptoParams& send_params) {
-  if (applied_send_params_.crypto_suite == send_params.crypto_suite &&
-      applied_send_params_.key_params == send_params.key_params) {
-    RTC_LOG(LS_INFO) << "Applying the same SRTP send parameters again. No-op.";
-
-    // We do not want to reset the ROC if the keys are the same. So just return.
-    return true;
-  }
-
-  send_crypto_suite_ = rtc::SrtpCryptoSuiteFromName(send_params.crypto_suite);
-  if (send_crypto_suite_ == rtc::kSrtpInvalidCryptoSuite) {
-    RTC_LOG(LS_WARNING) << "Unknown crypto suite(s) received:"
-                           " send crypto_suite "
-                        << send_params.crypto_suite;
-    return false;
-  }
-
-  int send_key_len, send_salt_len;
-  if (!rtc::GetSrtpKeyAndSaltLengths(*send_crypto_suite_, &send_key_len,
-                                     &send_salt_len)) {
-    RTC_LOG(LS_ERROR) << "Could not get lengths for crypto suite(s):"
-                         " send crypto_suite "
-                      << send_params.crypto_suite;
-    return false;
-  }
-
-  send_key_ = rtc::ZeroOnFreeBuffer<uint8_t>(send_key_len + send_salt_len);
-  return ParseKeyParams(send_params.key_params, send_key_.data(),
-                        send_key_.size());
-}
-
-bool SrtpFilter::ApplyRecvParams(const CryptoParams& recv_params) {
-  if (applied_recv_params_.crypto_suite == recv_params.crypto_suite &&
-      applied_recv_params_.key_params == recv_params.key_params) {
-    RTC_LOG(LS_INFO) << "Applying the same SRTP recv parameters again. No-op.";
-
-    // We do not want to reset the ROC if the keys are the same. So just return.
-    return true;
-  }
-
-  recv_crypto_suite_ = rtc::SrtpCryptoSuiteFromName(recv_params.crypto_suite);
-  if (recv_crypto_suite_ == rtc::kSrtpInvalidCryptoSuite) {
-    RTC_LOG(LS_WARNING) << "Unknown crypto suite(s) received:"
-                           " recv crypto_suite "
-                        << recv_params.crypto_suite;
-    return false;
-  }
-
-  int recv_key_len, recv_salt_len;
-  if (!rtc::GetSrtpKeyAndSaltLengths(*recv_crypto_suite_, &recv_key_len,
-                                     &recv_salt_len)) {
-    RTC_LOG(LS_ERROR) << "Could not get lengths for crypto suite(s):"
-                         " recv crypto_suite "
-                      << recv_params.crypto_suite;
-    return false;
-  }
-
-  recv_key_ = rtc::ZeroOnFreeBuffer<uint8_t>(recv_key_len + recv_salt_len);
-  return ParseKeyParams(recv_params.key_params, recv_key_.data(),
-                        recv_key_.size());
-}
-
-bool SrtpFilter::ParseKeyParams(const std::string& key_params,
-                                uint8_t* key,
-                                size_t len) {
-  // example key_params: "inline:YUJDZGVmZ2hpSktMbW9QUXJzVHVWd3l6MTIzNDU2"
-
-  // Fail if key-method is wrong.
-  if (!absl::StartsWith(key_params, "inline:")) {
-    return false;
-  }
-
-  // Fail if base64 decode fails, or the key is the wrong size.
-  std::string key_b64(key_params.substr(7)), key_str;
-  if (!rtc::Base64::Decode(key_b64, rtc::Base64::DO_STRICT, &key_str,
-                           nullptr) ||
-      key_str.size() != len) {
-    return false;
-  }
-
-  memcpy(key, key_str.c_str(), len);
-  // TODO(bugs.webrtc.org/8905): Switch to ZeroOnFreeBuffer for storing
-  // sensitive data.
-  rtc::ExplicitZeroMemory(&key_str[0], key_str.size());
-  return true;
-}
-
-}  // namespace cricket