Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 259 insertions, 0 deletions

diff --git a/dom/media/webrtc/transport/SrtpFlow.cpp b/dom/media/webrtc/transport/SrtpFlow.cpp
new file mode 100644
index 0000000000..827d1a0f6d
--- /dev/null
+++ b/dom/media/webrtc/transport/SrtpFlow.cpp
@@ -0,0 +1,259 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Original author: ekr@rtfm.com
+
+#include "logging.h"
+#include "SrtpFlow.h"
+
+#include "srtp.h"
+
+#include "transportlayerdtls.h"
+
+#include "mozilla/RefPtr.h"
+
+using namespace mozilla;
+
+namespace mozilla {
+
+MOZ_MTLOG_MODULE("mtransport")
+bool SrtpFlow::initialized;  // Static
+
+SrtpFlow::~SrtpFlow() {
+  if (session_) {
+    srtp_dealloc(session_);
+  }
+}
+
+unsigned int SrtpFlow::KeySize(int cipher_suite) {
+  srtp_profile_t profile = static_cast<srtp_profile_t>(cipher_suite);
+  return srtp_profile_get_master_key_length(profile);
+}
+
+unsigned int SrtpFlow::SaltSize(int cipher_suite) {
+  srtp_profile_t profile = static_cast<srtp_profile_t>(cipher_suite);
+  return srtp_profile_get_master_salt_length(profile);
+}
+
+RefPtr<SrtpFlow> SrtpFlow::Create(int cipher_suite, bool inbound,
+                                  const void* key, size_t key_len) {
+  nsresult res = Init();
+  if (!NS_SUCCEEDED(res)) return nullptr;
+
+  RefPtr<SrtpFlow> flow = new SrtpFlow();
+
+  if (!key) {
+    MOZ_MTLOG(ML_ERROR, "Null SRTP key specified");
+    return nullptr;
+  }
+
+  if ((key_len > SRTP_MAX_KEY_LENGTH) || (key_len < SRTP_MIN_KEY_LENGTH)) {
+    MOZ_ASSERT(false, "Invalid SRTP key length");
+    return nullptr;
+  }
+
+  srtp_policy_t policy;
+  memset(&policy, 0, sizeof(srtp_policy_t));
+
+  // Note that we set the same cipher suite for RTP and RTCP
+  // since any flow can only have one cipher suite with DTLS-SRTP
+  switch (cipher_suite) {
+    case kDtlsSrtpAeadAes256Gcm:
+      MOZ_MTLOG(ML_DEBUG, "Setting SRTP cipher suite SRTP_AEAD_AES_256_GCM");
+      srtp_crypto_policy_set_aes_gcm_256_16_auth(&policy.rtp);
+      srtp_crypto_policy_set_aes_gcm_256_16_auth(&policy.rtcp);
+      break;
+    case kDtlsSrtpAeadAes128Gcm:
+      MOZ_MTLOG(ML_DEBUG, "Setting SRTP cipher suite SRTP_AEAD_AES_128_GCM");
+      srtp_crypto_policy_set_aes_gcm_128_16_auth(&policy.rtp);
+      srtp_crypto_policy_set_aes_gcm_128_16_auth(&policy.rtcp);
+      break;
+    case kDtlsSrtpAes128CmHmacSha1_80:
+      MOZ_MTLOG(ML_DEBUG,
+                "Setting SRTP cipher suite SRTP_AES128_CM_HMAC_SHA1_80");
+      srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&policy.rtp);
+      srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&policy.rtcp);
+      break;
+    case kDtlsSrtpAes128CmHmacSha1_32:
+      MOZ_MTLOG(ML_DEBUG,
+                "Setting SRTP cipher suite SRTP_AES128_CM_HMAC_SHA1_32");
+      srtp_crypto_policy_set_aes_cm_128_hmac_sha1_32(&policy.rtp);
+      srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(
+          &policy.rtcp);  // 80-bit per RFC 5764
+      break;              // S 4.1.2.
+    default:
+      MOZ_MTLOG(ML_ERROR, "Request to set unknown SRTP cipher suite");
+      return nullptr;
+  }
+  // This key is copied into the srtp_t object, so we don't
+  // need to keep it.
+  policy.key =
+      const_cast<unsigned char*>(static_cast<const unsigned char*>(key));
+  policy.ssrc.type = inbound ? ssrc_any_inbound : ssrc_any_outbound;
+  policy.ssrc.value = 0;
+  policy.window_size =
+      1024;  // Use the Chrome value.  Needs to be revisited.  Default is 128
+  policy.allow_repeat_tx = 1;  // Use Chrome value; needed for NACK mode to work
+  policy.next = nullptr;
+
+  // Now make the session
+  srtp_err_status_t r = srtp_create(&flow->session_, &policy);
+  if (r != srtp_err_status_ok) {
+    MOZ_MTLOG(ML_ERROR, "Error creating srtp session");
+    return nullptr;
+  }
+
+  return flow;
+}
+
+nsresult SrtpFlow::CheckInputs(bool protect, void* in, int in_len, int max_len,
+                               int* out_len) {
+  MOZ_ASSERT(in);
+  if (!in) {
+    MOZ_MTLOG(ML_ERROR, "NULL input value");
+    return NS_ERROR_NULL_POINTER;
+  }
+
+  if (in_len < 0) {
+    MOZ_MTLOG(ML_ERROR, "Input length is negative");
+    return NS_ERROR_ILLEGAL_VALUE;
+  }
+
+  if (max_len < 0) {
+    MOZ_MTLOG(ML_ERROR, "Max output length is negative");
+    return NS_ERROR_ILLEGAL_VALUE;
+  }
+
+  if (protect) {
+    if ((max_len < SRTP_MAX_EXPANSION) ||
+        ((max_len - SRTP_MAX_EXPANSION) < in_len)) {
+      MOZ_MTLOG(ML_ERROR, "Output too short");
+      return NS_ERROR_ILLEGAL_VALUE;
+    }
+  } else {
+    if (in_len > max_len) {
+      MOZ_MTLOG(ML_ERROR, "Output too short");
+      return NS_ERROR_ILLEGAL_VALUE;
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult SrtpFlow::ProtectRtp(void* in, int in_len, int max_len, int* out_len) {
+  nsresult res = CheckInputs(true, in, in_len, max_len, out_len);
+  if (NS_FAILED(res)) return res;
+
+  int len = in_len;
+  srtp_err_status_t r = srtp_protect(session_, in, &len);
+
+  if (r != srtp_err_status_ok) {
+    MOZ_MTLOG(ML_ERROR, "Error protecting SRTP packet");
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_ASSERT(len <= max_len);
+  *out_len = len;
+
+  MOZ_MTLOG(ML_DEBUG,
+            "Successfully protected an SRTP packet of len " << *out_len);
+
+  return NS_OK;
+}
+
+nsresult SrtpFlow::UnprotectRtp(void* in, int in_len, int max_len,
+                                int* out_len) {
+  nsresult res = CheckInputs(false, in, in_len, max_len, out_len);
+  if (NS_FAILED(res)) return res;
+
+  int len = in_len;
+  srtp_err_status_t r = srtp_unprotect(session_, in, &len);
+
+  if (r != srtp_err_status_ok) {
+    MOZ_MTLOG(ML_ERROR, "Error unprotecting SRTP packet error=" << (int)r);
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_ASSERT(len <= max_len);
+  *out_len = len;
+
+  MOZ_MTLOG(ML_DEBUG,
+            "Successfully unprotected an SRTP packet of len " << *out_len);
+
+  return NS_OK;
+}
+
+nsresult SrtpFlow::ProtectRtcp(void* in, int in_len, int max_len,
+                               int* out_len) {
+  nsresult res = CheckInputs(true, in, in_len, max_len, out_len);
+  if (NS_FAILED(res)) return res;
+
+  int len = in_len;
+  srtp_err_status_t r = srtp_protect_rtcp(session_, in, &len);
+
+  if (r != srtp_err_status_ok) {
+    MOZ_MTLOG(ML_ERROR, "Error protecting SRTCP packet");
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_ASSERT(len <= max_len);
+  *out_len = len;
+
+  MOZ_MTLOG(ML_DEBUG,
+            "Successfully protected an SRTCP packet of len " << *out_len);
+
+  return NS_OK;
+}
+
+nsresult SrtpFlow::UnprotectRtcp(void* in, int in_len, int max_len,
+                                 int* out_len) {
+  nsresult res = CheckInputs(false, in, in_len, max_len, out_len);
+  if (NS_FAILED(res)) return res;
+
+  int len = in_len;
+  srtp_err_status_t r = srtp_unprotect_rtcp(session_, in, &len);
+
+  if (r != srtp_err_status_ok) {
+    MOZ_MTLOG(ML_ERROR, "Error unprotecting SRTCP packet error=" << (int)r);
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_ASSERT(len <= max_len);
+  *out_len = len;
+
+  MOZ_MTLOG(ML_DEBUG,
+            "Successfully unprotected an SRTCP packet of len " << *out_len);
+
+  return NS_OK;
+}
+
+// Statics
+void SrtpFlow::srtp_event_handler(srtp_event_data_t* data) {
+  // TODO(ekr@rtfm.com): Implement this
+  MOZ_CRASH();
+}
+
+nsresult SrtpFlow::Init() {
+  if (!initialized) {
+    srtp_err_status_t r = srtp_init();
+    if (r != srtp_err_status_ok) {
+      MOZ_MTLOG(ML_ERROR, "Could not initialize SRTP");
+      MOZ_ASSERT(PR_FALSE);
+      return NS_ERROR_FAILURE;
+    }
+
+    r = srtp_install_event_handler(&SrtpFlow::srtp_event_handler);
+    if (r != srtp_err_status_ok) {
+      MOZ_MTLOG(ML_ERROR, "Could not install SRTP event handler");
+      MOZ_ASSERT(PR_FALSE);
+      return NS_ERROR_FAILURE;
+    }
+
+    initialized = true;
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla