4dde3df3b5
BUG=None Review-Url: https://codereview.webrtc.org/2976443002 Cr-Commit-Position: refs/heads/master@{#18935}
110 lines
3.9 KiB
C++
110 lines
3.9 KiB
C++
/*
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* Copyright 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_PC_SRTPSESSION_H_
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#define WEBRTC_PC_SRTPSESSION_H_
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#include <vector>
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#include "webrtc/rtc_base/basictypes.h"
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#include "webrtc/rtc_base/thread_checker.h"
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// Forward declaration to avoid pulling in libsrtp headers here
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struct srtp_event_data_t;
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struct srtp_ctx_t_;
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namespace cricket {
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// Class that wraps a libSRTP session.
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class SrtpSession {
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public:
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SrtpSession();
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~SrtpSession();
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// Configures the session for sending data using the specified
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// cipher-suite and key. Receiving must be done by a separate session.
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bool SetSend(int cs, const uint8_t* key, size_t len);
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bool UpdateSend(int cs, const uint8_t* key, size_t len);
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// Configures the session for receiving data using the specified
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// cipher-suite and key. Sending must be done by a separate session.
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bool SetRecv(int cs, const uint8_t* key, size_t len);
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bool UpdateRecv(int cs, const uint8_t* key, size_t len);
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void SetEncryptedHeaderExtensionIds(
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const std::vector<int>& encrypted_header_extension_ids);
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// Encrypts/signs an individual RTP/RTCP packet, in-place.
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// If an HMAC is used, this will increase the packet size.
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bool ProtectRtp(void* data, int in_len, int max_len, int* out_len);
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// Overloaded version, outputs packet index.
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bool ProtectRtp(void* data,
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int in_len,
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int max_len,
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int* out_len,
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int64_t* index);
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bool ProtectRtcp(void* data, int in_len, int max_len, int* out_len);
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// Decrypts/verifies an invidiual RTP/RTCP packet.
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// If an HMAC is used, this will decrease the packet size.
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bool UnprotectRtp(void* data, int in_len, int* out_len);
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bool UnprotectRtcp(void* data, int in_len, int* out_len);
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// Helper method to get authentication params.
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bool GetRtpAuthParams(uint8_t** key, int* key_len, int* tag_len);
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int GetSrtpOverhead() const;
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// If external auth is enabled, SRTP will write a dummy auth tag that then
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// later must get replaced before the packet is sent out. Only supported for
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// non-GCM cipher suites and can be checked through "IsExternalAuthActive"
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// if it is actually used. This method is only valid before the RTP params
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// have been set.
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void EnableExternalAuth();
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bool IsExternalAuthEnabled() const;
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// A SRTP session supports external creation of the auth tag if a non-GCM
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// cipher is used. This method is only valid after the RTP params have
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// been set.
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bool IsExternalAuthActive() const;
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// Calls srtp_shutdown if it's initialized.
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static void Terminate();
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private:
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bool DoSetKey(int type, int cs, const uint8_t* key, size_t len);
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bool SetKey(int type, int cs, const uint8_t* key, size_t len);
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bool UpdateKey(int type, int cs, const uint8_t* key, size_t len);
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bool SetEncryptedHeaderExtensionIds(
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int type,
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const std::vector<int>& encrypted_header_extension_ids);
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// Returns send stream current packet index from srtp db.
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bool GetSendStreamPacketIndex(void* data, int in_len, int64_t* index);
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static bool Init();
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void HandleEvent(const srtp_event_data_t* ev);
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static void HandleEventThunk(srtp_event_data_t* ev);
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rtc::ThreadChecker thread_checker_;
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srtp_ctx_t_* session_ = nullptr;
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int rtp_auth_tag_len_ = 0;
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int rtcp_auth_tag_len_ = 0;
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static bool inited_;
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static rtc::GlobalLockPod lock_;
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int last_send_seq_num_ = -1;
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bool external_auth_active_ = false;
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bool external_auth_enabled_ = false;
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std::vector<int> encrypted_header_extension_ids_;
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RTC_DISALLOW_COPY_AND_ASSIGN(SrtpSession);
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};
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} // namespace cricket
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#endif // WEBRTC_PC_SRTPSESSION_H_
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