mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-30 15:36:57 +08:00
ae662fa083
之前默认随机创建dtls证书，导致每次启动证书都不一致，而Firefox要求同主机的dtls证书必须一致，所以导致每次服务重启，Firefox可能拒绝dtls握手。 并且在集群模式下，如果Firefox接入多个不同集群实例的webrtc服务，也可能导致webrtc dtls握手失败。
1444 lines
43 KiB
C++
1444 lines
43 KiB
C++
/**
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ISC License
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Copyright © 2015, Iñaki Baz Castillo <ibc@aliax.net>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#define MS_CLASS "RTC::DtlsTransport"
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// #define MS_LOG_DEV_LEVEL 3
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#include "DtlsTransport.hpp"
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#include "logger.h"
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#include <openssl/asn1.h>
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/rsa.h>
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#include <cstdio> // std::sprintf(), std::fopen()
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#include <cstring> // std::memcpy(), std::strcmp()
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#include "Util/util.h"
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#include "Util/SSLBox.h"
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#include "Util/SSLUtil.h"
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using namespace std;
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#define LOG_OPENSSL_ERROR(desc) \
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do \
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{ \
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if (ERR_peek_error() == 0) \
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MS_ERROR("OpenSSL error [desc:'%s']", desc); \
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else \
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{ \
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int64_t err; \
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while ((err = ERR_get_error()) != 0) \
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{ \
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MS_ERROR("OpenSSL error [desc:'%s', error:'%s']", desc, ERR_error_string(err, nullptr)); \
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} \
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ERR_clear_error(); \
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} \
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} while (false)
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/* Static methods for OpenSSL callbacks. */
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inline static int onSslCertificateVerify(int /*preverifyOk*/, X509_STORE_CTX* /*ctx*/)
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{
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MS_TRACE();
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// Always valid since DTLS certificates are self-signed.
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return 1;
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}
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inline static unsigned int onSslDtlsTimer(SSL* /*ssl*/, unsigned int timerUs)
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{
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if (timerUs == 0)
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return 100000;
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else if (timerUs >= 4000000)
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return 4000000;
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else
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return 2 * timerUs;
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}
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namespace RTC
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{
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/* Static. */
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// clang-format off
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static constexpr int DtlsMtu{ 1350 };
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// AES-HMAC: http://tools.ietf.org/html/rfc3711
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static constexpr size_t SrtpMasterKeyLength{ 16 };
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static constexpr size_t SrtpMasterSaltLength{ 14 };
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static constexpr size_t SrtpMasterLength{ SrtpMasterKeyLength + SrtpMasterSaltLength };
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// AES-GCM: http://tools.ietf.org/html/rfc7714
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static constexpr size_t SrtpAesGcm256MasterKeyLength{ 32 };
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static constexpr size_t SrtpAesGcm256MasterSaltLength{ 12 };
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static constexpr size_t SrtpAesGcm256MasterLength{ SrtpAesGcm256MasterKeyLength + SrtpAesGcm256MasterSaltLength };
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static constexpr size_t SrtpAesGcm128MasterKeyLength{ 16 };
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static constexpr size_t SrtpAesGcm128MasterSaltLength{ 12 };
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static constexpr size_t SrtpAesGcm128MasterLength{ SrtpAesGcm128MasterKeyLength + SrtpAesGcm128MasterSaltLength };
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// clang-format on
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/* Class variables. */
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// clang-format off
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std::map<std::string, DtlsTransport::FingerprintAlgorithm> DtlsTransport::string2FingerprintAlgorithm =
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{
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{ "sha-1", DtlsTransport::FingerprintAlgorithm::SHA1 },
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{ "sha-224", DtlsTransport::FingerprintAlgorithm::SHA224 },
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{ "sha-256", DtlsTransport::FingerprintAlgorithm::SHA256 },
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{ "sha-384", DtlsTransport::FingerprintAlgorithm::SHA384 },
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{ "sha-512", DtlsTransport::FingerprintAlgorithm::SHA512 }
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};
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std::map<DtlsTransport::FingerprintAlgorithm, std::string> DtlsTransport::fingerprintAlgorithm2String =
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{
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{ DtlsTransport::FingerprintAlgorithm::SHA1, "sha-1" },
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{ DtlsTransport::FingerprintAlgorithm::SHA224, "sha-224" },
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{ DtlsTransport::FingerprintAlgorithm::SHA256, "sha-256" },
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{ DtlsTransport::FingerprintAlgorithm::SHA384, "sha-384" },
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{ DtlsTransport::FingerprintAlgorithm::SHA512, "sha-512" }
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};
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std::map<std::string, DtlsTransport::Role> DtlsTransport::string2Role =
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{
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{ "auto", DtlsTransport::Role::AUTO },
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{ "client", DtlsTransport::Role::CLIENT },
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{ "server", DtlsTransport::Role::SERVER }
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};
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std::vector<DtlsTransport::SrtpCryptoSuiteMapEntry> DtlsTransport::srtpCryptoSuites =
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{
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{ RTC::SrtpSession::CryptoSuite::AEAD_AES_256_GCM, "SRTP_AEAD_AES_256_GCM" },
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{ RTC::SrtpSession::CryptoSuite::AEAD_AES_128_GCM, "SRTP_AEAD_AES_128_GCM" },
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{ RTC::SrtpSession::CryptoSuite::AES_CM_128_HMAC_SHA1_80, "SRTP_AES128_CM_SHA1_80" },
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{ RTC::SrtpSession::CryptoSuite::AES_CM_128_HMAC_SHA1_32, "SRTP_AES128_CM_SHA1_32" }
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};
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// clang-format on
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INSTANCE_IMP(DtlsTransport::DtlsEnvironment);
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/* Class methods. */
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DtlsTransport::DtlsEnvironment::DtlsEnvironment()
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{
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MS_TRACE();
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// Generate a X509 certificate and private key (unless PEM files are provided).
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auto ssl = toolkit::SSL_Initor::Instance().getSSLCtx("", true);
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if (!ssl || !ReadCertificateAndPrivateKeyFromContext(ssl.get())) {
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GenerateCertificateAndPrivateKey();
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}
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// Create a global SSL_CTX.
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CreateSslCtx();
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// Generate certificate fingerprints.
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GenerateFingerprints();
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}
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DtlsTransport::DtlsEnvironment::~DtlsEnvironment()
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{
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MS_TRACE();
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if (privateKey)
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EVP_PKEY_free(privateKey);
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if (certificate)
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X509_free(certificate);
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if (sslCtx)
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SSL_CTX_free(sslCtx);
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}
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void DtlsTransport::DtlsEnvironment::GenerateCertificateAndPrivateKey()
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{
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MS_TRACE();
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int ret{ 0 };
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EC_KEY* ecKey{ nullptr };
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X509_NAME* certName{ nullptr };
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std::string subject =
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std::string("mediasoup") + to_string(rand() % 999999 + 100000);
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// Create key with curve.
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ecKey = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
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if (!ecKey)
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{
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LOG_OPENSSL_ERROR("EC_KEY_new_by_curve_name() failed");
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goto error;
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}
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EC_KEY_set_asn1_flag(ecKey, OPENSSL_EC_NAMED_CURVE);
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// NOTE: This can take some time.
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ret = EC_KEY_generate_key(ecKey);
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if (ret == 0)
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{
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LOG_OPENSSL_ERROR("EC_KEY_generate_key() failed");
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goto error;
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}
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// Create a private key object.
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privateKey = EVP_PKEY_new();
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if (!privateKey)
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{
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LOG_OPENSSL_ERROR("EVP_PKEY_new() failed");
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goto error;
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}
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// NOLINTNEXTLINE(cppcoreguidelines-pro-type-cstyle-cast)
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ret = EVP_PKEY_assign_EC_KEY(privateKey, ecKey);
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if (ret == 0)
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{
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LOG_OPENSSL_ERROR("EVP_PKEY_assign_EC_KEY() failed");
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goto error;
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}
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// The EC key now belongs to the private key, so don't clean it up separately.
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ecKey = nullptr;
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// Create the X509 certificate.
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certificate = X509_new();
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if (!certificate)
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{
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LOG_OPENSSL_ERROR("X509_new() failed");
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goto error;
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}
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// Set version 3 (note that 0 means version 1).
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X509_set_version(certificate, 2);
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// Set serial number (avoid default 0).
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ASN1_INTEGER_set(
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X509_get_serialNumber(certificate),
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static_cast<uint64_t>(rand() % 999999 + 100000));
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// Set valid period.
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X509_gmtime_adj(X509_get_notBefore(certificate), -315360000); // -10 years.
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X509_gmtime_adj(X509_get_notAfter(certificate), 315360000); // 10 years.
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// Set the public key for the certificate using the key.
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ret = X509_set_pubkey(certificate, privateKey);
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if (ret == 0)
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{
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LOG_OPENSSL_ERROR("X509_set_pubkey() failed");
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goto error;
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}
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// Set certificate fields.
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certName = X509_get_subject_name(certificate);
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if (!certName)
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{
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LOG_OPENSSL_ERROR("X509_get_subject_name() failed");
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goto error;
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}
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X509_NAME_add_entry_by_txt(
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certName, "O", MBSTRING_ASC, reinterpret_cast<const uint8_t*>(subject.c_str()), -1, -1, 0);
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X509_NAME_add_entry_by_txt(
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certName, "CN", MBSTRING_ASC, reinterpret_cast<const uint8_t*>(subject.c_str()), -1, -1, 0);
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// It is self-signed so set the issuer name to be the same as the subject.
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ret = X509_set_issuer_name(certificate, certName);
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if (ret == 0)
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{
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LOG_OPENSSL_ERROR("X509_set_issuer_name() failed");
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goto error;
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}
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// Sign the certificate with its own private key.
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ret = X509_sign(certificate, privateKey, EVP_sha1());
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if (ret == 0)
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{
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LOG_OPENSSL_ERROR("X509_sign() failed");
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goto error;
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}
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return;
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error:
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if (ecKey)
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EC_KEY_free(ecKey);
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if (privateKey)
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EVP_PKEY_free(privateKey); // NOTE: This also frees the EC key.
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if (certificate)
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X509_free(certificate);
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MS_THROW_ERROR("DTLS certificate and private key generation failed");
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}
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bool DtlsTransport::DtlsEnvironment::ReadCertificateAndPrivateKeyFromContext(SSL_CTX *ctx)
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{
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MS_TRACE();
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certificate = SSL_CTX_get0_certificate(ctx);
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if (!certificate) {
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return false;
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}
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X509_up_ref(certificate);
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privateKey = SSL_CTX_get0_privatekey(ctx);
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if (!privateKey) {
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return false;
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}
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EVP_PKEY_up_ref(privateKey);
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InfoL << "Load webrtc dtls certificate: " << toolkit::SSLUtil::getServerName(certificate);
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return true;
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}
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void DtlsTransport::DtlsEnvironment::CreateSslCtx()
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{
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MS_TRACE();
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std::string dtlsSrtpCryptoSuites;
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int ret;
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/* Set the global DTLS context. */
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// Both DTLS 1.0 and 1.2 (requires OpenSSL >= 1.1.0).
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sslCtx = SSL_CTX_new(DTLS_method());
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if (!sslCtx)
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{
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LOG_OPENSSL_ERROR("SSL_CTX_new() failed");
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goto error;
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}
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ret = SSL_CTX_use_certificate(sslCtx, certificate);
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if (ret == 0)
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{
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LOG_OPENSSL_ERROR("SSL_CTX_use_certificate() failed");
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goto error;
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}
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ret = SSL_CTX_use_PrivateKey(sslCtx, privateKey);
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if (ret == 0)
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{
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LOG_OPENSSL_ERROR("SSL_CTX_use_PrivateKey() failed");
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goto error;
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}
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ret = SSL_CTX_check_private_key(sslCtx);
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if (ret == 0)
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{
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LOG_OPENSSL_ERROR("SSL_CTX_check_private_key() failed");
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goto error;
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}
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// Set options.
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SSL_CTX_set_options(
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sslCtx,
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SSL_OP_CIPHER_SERVER_PREFERENCE | SSL_OP_NO_TICKET | SSL_OP_SINGLE_ECDH_USE |
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SSL_OP_NO_QUERY_MTU);
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// Don't use sessions cache.
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SSL_CTX_set_session_cache_mode(sslCtx, SSL_SESS_CACHE_OFF);
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// Read always as much into the buffer as possible.
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// NOTE: This is the default for DTLS, but a bug in non latest OpenSSL
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// versions makes this call required.
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SSL_CTX_set_read_ahead(sslCtx, 1);
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SSL_CTX_set_verify_depth(sslCtx, 4);
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// Require certificate from peer.
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SSL_CTX_set_verify(
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sslCtx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, onSslCertificateVerify);
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// Set SSL info callback.
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SSL_CTX_set_info_callback(sslCtx, [](const SSL* ssl, int where, int ret){
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static_cast<RTC::DtlsTransport*>(SSL_get_ex_data(ssl, 0))->OnSslInfo(where, ret);
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});
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// Set ciphers.
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ret = SSL_CTX_set_cipher_list(
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sslCtx, "DEFAULT:!NULL:!aNULL:!SHA256:!SHA384:!aECDH:!AESGCM+AES256:!aPSK");
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if (ret == 0)
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{
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LOG_OPENSSL_ERROR("SSL_CTX_set_cipher_list() failed");
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goto error;
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}
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// Enable ECDH ciphers.
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// DOC: http://en.wikibooks.org/wiki/OpenSSL/Diffie-Hellman_parameters
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// NOTE: https://code.google.com/p/chromium/issues/detail?id=406458
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// NOTE: https://bugs.ruby-lang.org/issues/12324
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// For OpenSSL >= 1.0.2.
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SSL_CTX_set_ecdh_auto(sslCtx, 1);
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// Set the "use_srtp" DTLS extension.
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for (auto it = DtlsTransport::srtpCryptoSuites.begin();
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it != DtlsTransport::srtpCryptoSuites.end();
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++it)
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{
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if (it != DtlsTransport::srtpCryptoSuites.begin())
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dtlsSrtpCryptoSuites += ":";
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SrtpCryptoSuiteMapEntry* cryptoSuiteEntry = std::addressof(*it);
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dtlsSrtpCryptoSuites += cryptoSuiteEntry->name;
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}
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MS_DEBUG_2TAGS(dtls, srtp, "setting SRTP cryptoSuites for DTLS: %s", dtlsSrtpCryptoSuites.c_str());
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// NOTE: This function returns 0 on success.
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ret = SSL_CTX_set_tlsext_use_srtp(sslCtx, dtlsSrtpCryptoSuites.c_str());
|
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|
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if (ret != 0)
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{
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MS_ERROR(
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"SSL_CTX_set_tlsext_use_srtp() failed when entering '%s'", dtlsSrtpCryptoSuites.c_str());
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LOG_OPENSSL_ERROR("SSL_CTX_set_tlsext_use_srtp() failed");
|
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goto error;
|
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}
|
|
|
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return;
|
|
|
|
error:
|
|
|
|
if (sslCtx)
|
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{
|
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SSL_CTX_free(sslCtx);
|
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sslCtx = nullptr;
|
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}
|
|
|
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MS_THROW_ERROR("SSL context creation failed");
|
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}
|
|
|
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void DtlsTransport::DtlsEnvironment::GenerateFingerprints()
|
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{
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MS_TRACE();
|
|
|
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for (auto& kv : DtlsTransport::string2FingerprintAlgorithm)
|
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{
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const std::string& algorithmString = kv.first;
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FingerprintAlgorithm algorithm = kv.second;
|
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uint8_t binaryFingerprint[EVP_MAX_MD_SIZE];
|
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unsigned int size{ 0 };
|
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char hexFingerprint[(EVP_MAX_MD_SIZE * 3) + 1];
|
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const EVP_MD* hashFunction;
|
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int ret;
|
|
|
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switch (algorithm)
|
|
{
|
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case FingerprintAlgorithm::SHA1:
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hashFunction = EVP_sha1();
|
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break;
|
|
|
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case FingerprintAlgorithm::SHA224:
|
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hashFunction = EVP_sha224();
|
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break;
|
|
|
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case FingerprintAlgorithm::SHA256:
|
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hashFunction = EVP_sha256();
|
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break;
|
|
|
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case FingerprintAlgorithm::SHA384:
|
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hashFunction = EVP_sha384();
|
|
break;
|
|
|
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case FingerprintAlgorithm::SHA512:
|
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hashFunction = EVP_sha512();
|
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break;
|
|
|
|
default:
|
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MS_THROW_ERROR("unknown algorithm");
|
|
}
|
|
|
|
ret = X509_digest(certificate, hashFunction, binaryFingerprint, &size);
|
|
|
|
if (ret == 0)
|
|
{
|
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MS_ERROR("X509_digest() failed");
|
|
MS_THROW_ERROR("Fingerprints generation failed");
|
|
}
|
|
|
|
// Convert to hexadecimal format in uppercase with colons.
|
|
for (unsigned int i{ 0 }; i < size; ++i)
|
|
{
|
|
std::sprintf(hexFingerprint + (i * 3), "%.2X:", binaryFingerprint[i]);
|
|
}
|
|
hexFingerprint[(size * 3) - 1] = '\0';
|
|
|
|
MS_DEBUG_TAG(dtls, "%-7s fingerprint: %s", algorithmString.c_str(), hexFingerprint);
|
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|
|
// Store it in the vector.
|
|
DtlsTransport::Fingerprint fingerprint;
|
|
|
|
fingerprint.algorithm = DtlsTransport::GetFingerprintAlgorithm(algorithmString);
|
|
fingerprint.value = hexFingerprint;
|
|
|
|
localFingerprints.push_back(fingerprint);
|
|
}
|
|
}
|
|
|
|
/* Instance methods. */
|
|
|
|
DtlsTransport::DtlsTransport(EventPoller::Ptr poller,Listener* listener) : poller(std::move(poller)), listener(listener)
|
|
{
|
|
MS_TRACE();
|
|
env = DtlsEnvironment::Instance().shared_from_this();
|
|
|
|
/* Set SSL. */
|
|
|
|
this->ssl = SSL_new(env->sslCtx);
|
|
|
|
if (!this->ssl)
|
|
{
|
|
LOG_OPENSSL_ERROR("SSL_new() failed");
|
|
|
|
goto error;
|
|
}
|
|
|
|
// Set this as custom data.
|
|
SSL_set_ex_data(this->ssl, 0, static_cast<void*>(this));
|
|
|
|
this->sslBioFromNetwork = BIO_new(BIO_s_mem());
|
|
|
|
if (!this->sslBioFromNetwork)
|
|
{
|
|
LOG_OPENSSL_ERROR("BIO_new() failed");
|
|
|
|
SSL_free(this->ssl);
|
|
|
|
goto error;
|
|
}
|
|
|
|
this->sslBioToNetwork = BIO_new(BIO_s_mem());
|
|
|
|
if (!this->sslBioToNetwork)
|
|
{
|
|
LOG_OPENSSL_ERROR("BIO_new() failed");
|
|
|
|
BIO_free(this->sslBioFromNetwork);
|
|
SSL_free(this->ssl);
|
|
|
|
goto error;
|
|
}
|
|
|
|
SSL_set_bio(this->ssl, this->sslBioFromNetwork, this->sslBioToNetwork);
|
|
|
|
// Set the MTU so that we don't send packets that are too large with no fragmentation.
|
|
SSL_set_mtu(this->ssl, DtlsMtu);
|
|
DTLS_set_link_mtu(this->ssl, DtlsMtu);
|
|
|
|
// Set callback handler for setting DTLS timer interval.
|
|
DTLS_set_timer_cb(this->ssl, onSslDtlsTimer);
|
|
|
|
return;
|
|
|
|
error:
|
|
|
|
// NOTE: At this point SSL_set_bio() was not called so we must free BIOs as
|
|
// well.
|
|
if (this->sslBioFromNetwork)
|
|
BIO_free(this->sslBioFromNetwork);
|
|
|
|
if (this->sslBioToNetwork)
|
|
BIO_free(this->sslBioToNetwork);
|
|
|
|
if (this->ssl)
|
|
SSL_free(this->ssl);
|
|
|
|
// NOTE: If this is not catched by the caller the program will abort, but
|
|
// this should never happen.
|
|
MS_THROW_ERROR("DtlsTransport instance creation failed");
|
|
}
|
|
|
|
DtlsTransport::~DtlsTransport()
|
|
{
|
|
MS_TRACE();
|
|
|
|
if (IsRunning())
|
|
{
|
|
// Send close alert to the peer.
|
|
SSL_shutdown(this->ssl);
|
|
SendPendingOutgoingDtlsData();
|
|
}
|
|
|
|
if (this->ssl)
|
|
{
|
|
SSL_free(this->ssl);
|
|
|
|
this->ssl = nullptr;
|
|
this->sslBioFromNetwork = nullptr;
|
|
this->sslBioToNetwork = nullptr;
|
|
}
|
|
|
|
// Close the DTLS timer.
|
|
this->timer = nullptr;
|
|
}
|
|
|
|
void DtlsTransport::Dump() const
|
|
{
|
|
MS_TRACE();
|
|
|
|
std::string state{ "new" };
|
|
std::string role{ "none " };
|
|
|
|
switch (this->state)
|
|
{
|
|
case DtlsState::CONNECTING:
|
|
state = "connecting";
|
|
break;
|
|
case DtlsState::CONNECTED:
|
|
state = "connected";
|
|
break;
|
|
case DtlsState::FAILED:
|
|
state = "failed";
|
|
break;
|
|
case DtlsState::CLOSED:
|
|
state = "closed";
|
|
break;
|
|
default:;
|
|
}
|
|
|
|
switch (this->localRole)
|
|
{
|
|
case Role::AUTO:
|
|
role = "auto";
|
|
break;
|
|
case Role::SERVER:
|
|
role = "server";
|
|
break;
|
|
case Role::CLIENT:
|
|
role = "client";
|
|
break;
|
|
default:;
|
|
}
|
|
|
|
MS_DUMP("<DtlsTransport>");
|
|
MS_DUMP(" state : %s", state.c_str());
|
|
MS_DUMP(" role : %s", role.c_str());
|
|
MS_DUMP(" handshake done: : %s", this->handshakeDone ? "yes" : "no");
|
|
MS_DUMP("</DtlsTransport>");
|
|
}
|
|
|
|
void DtlsTransport::Run(Role localRole)
|
|
{
|
|
MS_TRACE();
|
|
|
|
MS_ASSERT(
|
|
localRole == Role::CLIENT || localRole == Role::SERVER,
|
|
"local DTLS role must be 'client' or 'server'");
|
|
|
|
Role previousLocalRole = this->localRole;
|
|
|
|
if (localRole == previousLocalRole)
|
|
{
|
|
MS_ERROR("same local DTLS role provided, doing nothing");
|
|
|
|
return;
|
|
}
|
|
|
|
// If the previous local DTLS role was 'client' or 'server' do reset.
|
|
if (previousLocalRole == Role::CLIENT || previousLocalRole == Role::SERVER)
|
|
{
|
|
MS_DEBUG_TAG(dtls, "resetting DTLS due to local role change");
|
|
|
|
Reset();
|
|
}
|
|
|
|
// Update local role.
|
|
this->localRole = localRole;
|
|
|
|
// Set state and notify the listener.
|
|
this->state = DtlsState::CONNECTING;
|
|
this->listener->OnDtlsTransportConnecting(this);
|
|
|
|
switch (this->localRole)
|
|
{
|
|
case Role::CLIENT:
|
|
{
|
|
MS_DEBUG_TAG(dtls, "running [role:client]");
|
|
|
|
SSL_set_connect_state(this->ssl);
|
|
SSL_do_handshake(this->ssl);
|
|
SendPendingOutgoingDtlsData();
|
|
SetTimeout();
|
|
|
|
break;
|
|
}
|
|
|
|
case Role::SERVER:
|
|
{
|
|
MS_DEBUG_TAG(dtls, "running [role:server]");
|
|
|
|
SSL_set_accept_state(this->ssl);
|
|
SSL_do_handshake(this->ssl);
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
{
|
|
MS_ABORT("invalid local DTLS role");
|
|
}
|
|
}
|
|
}
|
|
|
|
bool DtlsTransport::SetRemoteFingerprint(Fingerprint fingerprint)
|
|
{
|
|
MS_TRACE();
|
|
|
|
MS_ASSERT(
|
|
fingerprint.algorithm != FingerprintAlgorithm::NONE, "no fingerprint algorithm provided");
|
|
|
|
this->remoteFingerprint = fingerprint;
|
|
|
|
// The remote fingerpring may have been set after DTLS handshake was done,
|
|
// so we may need to process it now.
|
|
if (this->handshakeDone && this->state != DtlsState::CONNECTED)
|
|
{
|
|
MS_DEBUG_TAG(dtls, "handshake already done, processing it right now");
|
|
|
|
return ProcessHandshake();
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void DtlsTransport::ProcessDtlsData(const uint8_t* data, size_t len)
|
|
{
|
|
MS_TRACE();
|
|
|
|
int written;
|
|
int read;
|
|
|
|
if (!IsRunning())
|
|
{
|
|
MS_ERROR("cannot process data while not running");
|
|
|
|
return;
|
|
}
|
|
|
|
// Write the received DTLS data into the sslBioFromNetwork.
|
|
written =
|
|
BIO_write(this->sslBioFromNetwork, static_cast<const void*>(data), static_cast<int>(len));
|
|
|
|
if (written != static_cast<int>(len))
|
|
{
|
|
MS_WARN_TAG(
|
|
dtls,
|
|
"OpenSSL BIO_write() wrote less (%zu bytes) than given data (%zu bytes)",
|
|
static_cast<size_t>(written),
|
|
len);
|
|
}
|
|
|
|
// Must call SSL_read() to process received DTLS data.
|
|
read = SSL_read(this->ssl, static_cast<void*>(DtlsTransport::sslReadBuffer), SslReadBufferSize);
|
|
|
|
// Send data if it's ready.
|
|
SendPendingOutgoingDtlsData();
|
|
|
|
// Check SSL status and return if it is bad/closed.
|
|
if (!CheckStatus(read))
|
|
return;
|
|
|
|
// Set/update the DTLS timeout.
|
|
if (!SetTimeout())
|
|
return;
|
|
|
|
// Application data received. Notify to the listener.
|
|
if (read > 0)
|
|
{
|
|
// It is allowed to receive DTLS data even before validating remote fingerprint.
|
|
if (!this->handshakeDone)
|
|
{
|
|
MS_WARN_TAG(dtls, "ignoring application data received while DTLS handshake not done");
|
|
|
|
return;
|
|
}
|
|
|
|
// Notify the listener.
|
|
this->listener->OnDtlsTransportApplicationDataReceived(
|
|
this, (uint8_t*)DtlsTransport::sslReadBuffer, static_cast<size_t>(read));
|
|
}
|
|
}
|
|
|
|
void DtlsTransport::SendApplicationData(const uint8_t* data, size_t len)
|
|
{
|
|
MS_TRACE();
|
|
|
|
// We cannot send data to the peer if its remote fingerprint is not validated.
|
|
if (this->state != DtlsState::CONNECTED)
|
|
{
|
|
MS_WARN_TAG(dtls, "cannot send application data while DTLS is not fully connected");
|
|
|
|
return;
|
|
}
|
|
|
|
if (len == 0)
|
|
{
|
|
MS_WARN_TAG(dtls, "ignoring 0 length data");
|
|
|
|
return;
|
|
}
|
|
|
|
int written;
|
|
|
|
written = SSL_write(this->ssl, static_cast<const void*>(data), static_cast<int>(len));
|
|
|
|
if (written < 0)
|
|
{
|
|
LOG_OPENSSL_ERROR("SSL_write() failed");
|
|
|
|
if (!CheckStatus(written))
|
|
return;
|
|
}
|
|
else if (written != static_cast<int>(len))
|
|
{
|
|
MS_WARN_TAG(
|
|
dtls, "OpenSSL SSL_write() wrote less (%d bytes) than given data (%zu bytes)", written, len);
|
|
}
|
|
|
|
// Send data.
|
|
SendPendingOutgoingDtlsData();
|
|
}
|
|
|
|
void DtlsTransport::Reset()
|
|
{
|
|
MS_TRACE();
|
|
|
|
int ret;
|
|
|
|
if (!IsRunning())
|
|
return;
|
|
|
|
MS_WARN_TAG(dtls, "resetting DTLS transport");
|
|
|
|
// Stop the DTLS timer.
|
|
this->timer = nullptr;
|
|
|
|
// We need to reset the SSL instance so we need to "shutdown" it, but we
|
|
// don't want to send a Close Alert to the peer, so just don't call
|
|
// SendPendingOutgoingDTLSData().
|
|
SSL_shutdown(this->ssl);
|
|
|
|
this->localRole = Role::NONE;
|
|
this->state = DtlsState::NEW;
|
|
this->handshakeDone = false;
|
|
this->handshakeDoneNow = false;
|
|
|
|
// Reset SSL status.
|
|
// NOTE: For this to properly work, SSL_shutdown() must be called before.
|
|
// NOTE: This may fail if not enough DTLS handshake data has been received,
|
|
// but we don't care so just clear the error queue.
|
|
ret = SSL_clear(this->ssl);
|
|
|
|
if (ret == 0)
|
|
ERR_clear_error();
|
|
}
|
|
|
|
inline bool DtlsTransport::CheckStatus(int returnCode)
|
|
{
|
|
MS_TRACE();
|
|
|
|
int err;
|
|
bool wasHandshakeDone = this->handshakeDone;
|
|
|
|
err = SSL_get_error(this->ssl, returnCode);
|
|
|
|
switch (err)
|
|
{
|
|
case SSL_ERROR_NONE:
|
|
break;
|
|
|
|
case SSL_ERROR_SSL:
|
|
LOG_OPENSSL_ERROR("SSL status: SSL_ERROR_SSL");
|
|
break;
|
|
|
|
case SSL_ERROR_WANT_READ:
|
|
break;
|
|
|
|
case SSL_ERROR_WANT_WRITE:
|
|
MS_WARN_TAG(dtls, "SSL status: SSL_ERROR_WANT_WRITE");
|
|
break;
|
|
|
|
case SSL_ERROR_WANT_X509_LOOKUP:
|
|
MS_DEBUG_TAG(dtls, "SSL status: SSL_ERROR_WANT_X509_LOOKUP");
|
|
break;
|
|
|
|
case SSL_ERROR_SYSCALL:
|
|
LOG_OPENSSL_ERROR("SSL status: SSL_ERROR_SYSCALL");
|
|
break;
|
|
|
|
case SSL_ERROR_ZERO_RETURN:
|
|
break;
|
|
|
|
case SSL_ERROR_WANT_CONNECT:
|
|
MS_WARN_TAG(dtls, "SSL status: SSL_ERROR_WANT_CONNECT");
|
|
break;
|
|
|
|
case SSL_ERROR_WANT_ACCEPT:
|
|
MS_WARN_TAG(dtls, "SSL status: SSL_ERROR_WANT_ACCEPT");
|
|
break;
|
|
|
|
default:
|
|
MS_WARN_TAG(dtls, "SSL status: unknown error");
|
|
}
|
|
|
|
// Check if the handshake (or re-handshake) has been done right now.
|
|
if (this->handshakeDoneNow)
|
|
{
|
|
this->handshakeDoneNow = false;
|
|
this->handshakeDone = true;
|
|
|
|
// Stop the timer.
|
|
this->timer = nullptr;
|
|
|
|
// Process the handshake just once (ignore if DTLS renegotiation).
|
|
if (!wasHandshakeDone && this->remoteFingerprint.algorithm != FingerprintAlgorithm::NONE)
|
|
return ProcessHandshake();
|
|
|
|
return true;
|
|
}
|
|
// Check if the peer sent close alert or a fatal error happened.
|
|
else if (((SSL_get_shutdown(this->ssl) & SSL_RECEIVED_SHUTDOWN) != 0) || err == SSL_ERROR_SSL || err == SSL_ERROR_SYSCALL)
|
|
{
|
|
if (this->state == DtlsState::CONNECTED)
|
|
{
|
|
MS_DEBUG_TAG(dtls, "disconnected");
|
|
|
|
Reset();
|
|
|
|
// Set state and notify the listener.
|
|
this->state = DtlsState::CLOSED;
|
|
this->listener->OnDtlsTransportClosed(this);
|
|
}
|
|
else
|
|
{
|
|
MS_WARN_TAG(dtls, "connection failed");
|
|
|
|
Reset();
|
|
|
|
// Set state and notify the listener.
|
|
this->state = DtlsState::FAILED;
|
|
this->listener->OnDtlsTransportFailed(this);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
inline void DtlsTransport::SendPendingOutgoingDtlsData()
|
|
{
|
|
MS_TRACE();
|
|
|
|
if (BIO_eof(this->sslBioToNetwork))
|
|
return;
|
|
|
|
int64_t read;
|
|
char* data{ nullptr };
|
|
|
|
read = BIO_get_mem_data(this->sslBioToNetwork, &data); // NOLINT
|
|
|
|
if (read <= 0)
|
|
return;
|
|
|
|
MS_DEBUG_DEV("%" PRIu64 " bytes of DTLS data ready to sent to the peer", read);
|
|
|
|
// Notify the listener.
|
|
this->listener->OnDtlsTransportSendData(
|
|
this, reinterpret_cast<uint8_t*>(data), static_cast<size_t>(read));
|
|
|
|
// Clear the BIO buffer.
|
|
// NOTE: the (void) avoids the -Wunused-value warning.
|
|
(void)BIO_reset(this->sslBioToNetwork);
|
|
}
|
|
|
|
inline bool DtlsTransport::SetTimeout()
|
|
{
|
|
MS_TRACE();
|
|
|
|
MS_ASSERT(
|
|
this->state == DtlsState::CONNECTING || this->state == DtlsState::CONNECTED,
|
|
"invalid DTLS state");
|
|
|
|
int64_t ret;
|
|
struct timeval dtlsTimeout{ 0, 0 };
|
|
uint64_t timeoutMs;
|
|
|
|
// NOTE: If ret == 0 then ignore the value in dtlsTimeout.
|
|
// NOTE: No DTLSv_1_2_get_timeout() or DTLS_get_timeout() in OpenSSL 1.1.0-dev.
|
|
ret = DTLSv1_get_timeout(this->ssl, static_cast<void*>(&dtlsTimeout)); // NOLINT
|
|
|
|
if (ret == 0)
|
|
return true;
|
|
|
|
timeoutMs = (dtlsTimeout.tv_sec * static_cast<uint64_t>(1000)) + (dtlsTimeout.tv_usec / 1000);
|
|
|
|
if (timeoutMs == 0)
|
|
{
|
|
return true;
|
|
}
|
|
else if (timeoutMs < 30000)
|
|
{
|
|
MS_DEBUG_DEV("DTLS timer set in %" PRIu64 "ms", timeoutMs);
|
|
|
|
weak_ptr<DtlsTransport> weak_self = shared_from_this();
|
|
this->timer = std::make_shared<Timer>(timeoutMs / 1000.0f, [weak_self](){
|
|
auto strong_self = weak_self.lock();
|
|
if(strong_self){
|
|
strong_self->OnTimer();
|
|
}
|
|
return true;
|
|
}, this->poller);
|
|
|
|
return true;
|
|
}
|
|
// NOTE: Don't start the timer again if the timeout is greater than 30 seconds.
|
|
else
|
|
{
|
|
MS_WARN_TAG(dtls, "DTLS timeout too high (%" PRIu64 "ms), resetting DLTS", timeoutMs);
|
|
|
|
Reset();
|
|
|
|
// Set state and notify the listener.
|
|
this->state = DtlsState::FAILED;
|
|
this->listener->OnDtlsTransportFailed(this);
|
|
|
|
return false;
|
|
}
|
|
}
|
|
|
|
inline bool DtlsTransport::ProcessHandshake()
|
|
{
|
|
MS_TRACE();
|
|
|
|
MS_ASSERT(this->handshakeDone, "handshake not done yet");
|
|
MS_ASSERT(
|
|
this->remoteFingerprint.algorithm != FingerprintAlgorithm::NONE, "remote fingerprint not set");
|
|
|
|
// Validate the remote fingerprint.
|
|
if (!CheckRemoteFingerprint())
|
|
{
|
|
Reset();
|
|
|
|
// Set state and notify the listener.
|
|
this->state = DtlsState::FAILED;
|
|
this->listener->OnDtlsTransportFailed(this);
|
|
|
|
return false;
|
|
}
|
|
|
|
// Get the negotiated SRTP crypto suite.
|
|
RTC::SrtpSession::CryptoSuite srtpCryptoSuite = GetNegotiatedSrtpCryptoSuite();
|
|
|
|
if (srtpCryptoSuite != RTC::SrtpSession::CryptoSuite::NONE)
|
|
{
|
|
// Extract the SRTP keys (will notify the listener with them).
|
|
ExtractSrtpKeys(srtpCryptoSuite);
|
|
|
|
return true;
|
|
}
|
|
|
|
// NOTE: We assume that "use_srtp" DTLS extension is required even if
|
|
// there is no audio/video.
|
|
MS_WARN_2TAGS(dtls, srtp, "SRTP crypto suite not negotiated");
|
|
|
|
Reset();
|
|
|
|
// Set state and notify the listener.
|
|
this->state = DtlsState::FAILED;
|
|
this->listener->OnDtlsTransportFailed(this);
|
|
|
|
return false;
|
|
}
|
|
|
|
inline bool DtlsTransport::CheckRemoteFingerprint()
|
|
{
|
|
MS_TRACE();
|
|
|
|
MS_ASSERT(
|
|
this->remoteFingerprint.algorithm != FingerprintAlgorithm::NONE, "remote fingerprint not set");
|
|
|
|
X509* certificate;
|
|
uint8_t binaryFingerprint[EVP_MAX_MD_SIZE];
|
|
unsigned int size{ 0 };
|
|
char hexFingerprint[(EVP_MAX_MD_SIZE * 3) + 1];
|
|
const EVP_MD* hashFunction;
|
|
int ret;
|
|
|
|
certificate = SSL_get_peer_certificate(this->ssl);
|
|
|
|
if (!certificate)
|
|
{
|
|
MS_WARN_TAG(dtls, "no certificate was provided by the peer");
|
|
|
|
return false;
|
|
}
|
|
|
|
switch (this->remoteFingerprint.algorithm)
|
|
{
|
|
case FingerprintAlgorithm::SHA1:
|
|
hashFunction = EVP_sha1();
|
|
break;
|
|
|
|
case FingerprintAlgorithm::SHA224:
|
|
hashFunction = EVP_sha224();
|
|
break;
|
|
|
|
case FingerprintAlgorithm::SHA256:
|
|
hashFunction = EVP_sha256();
|
|
break;
|
|
|
|
case FingerprintAlgorithm::SHA384:
|
|
hashFunction = EVP_sha384();
|
|
break;
|
|
|
|
case FingerprintAlgorithm::SHA512:
|
|
hashFunction = EVP_sha512();
|
|
break;
|
|
|
|
default:
|
|
MS_ABORT("unknown algorithm");
|
|
}
|
|
|
|
// Compare the remote fingerprint with the value given via signaling.
|
|
ret = X509_digest(certificate, hashFunction, binaryFingerprint, &size);
|
|
|
|
if (ret == 0)
|
|
{
|
|
MS_ERROR("X509_digest() failed");
|
|
|
|
X509_free(certificate);
|
|
|
|
return false;
|
|
}
|
|
|
|
// Convert to hexadecimal format in uppercase with colons.
|
|
for (unsigned int i{ 0 }; i < size; ++i)
|
|
{
|
|
std::sprintf(hexFingerprint + (i * 3), "%.2X:", binaryFingerprint[i]);
|
|
}
|
|
hexFingerprint[(size * 3) - 1] = '\0';
|
|
|
|
if (this->remoteFingerprint.value != hexFingerprint)
|
|
{
|
|
MS_WARN_TAG(
|
|
dtls,
|
|
"fingerprint in the remote certificate (%s) does not match the announced one (%s)",
|
|
hexFingerprint,
|
|
this->remoteFingerprint.value.c_str());
|
|
X509_free(certificate);
|
|
return false;
|
|
}
|
|
|
|
MS_DEBUG_TAG(dtls, "valid remote fingerprint");
|
|
|
|
// Get the remote certificate in PEM format.
|
|
|
|
BIO* bio = BIO_new(BIO_s_mem());
|
|
|
|
// Ensure the underlying BUF_MEM structure is also freed.
|
|
// NOTE: Avoid stupid "warning: value computed is not used [-Wunused-value]" since
|
|
// BIO_set_close() always returns 1.
|
|
(void)BIO_set_close(bio, BIO_CLOSE);
|
|
|
|
ret = PEM_write_bio_X509(bio, certificate);
|
|
|
|
if (ret != 1)
|
|
{
|
|
LOG_OPENSSL_ERROR("PEM_write_bio_X509() failed");
|
|
|
|
X509_free(certificate);
|
|
BIO_free(bio);
|
|
|
|
return false;
|
|
}
|
|
|
|
BUF_MEM* mem;
|
|
|
|
BIO_get_mem_ptr(bio, &mem); // NOLINT[cppcoreguidelines-pro-type-cstyle-cast]
|
|
|
|
if (!mem || !mem->data || mem->length == 0u)
|
|
{
|
|
LOG_OPENSSL_ERROR("BIO_get_mem_ptr() failed");
|
|
|
|
X509_free(certificate);
|
|
BIO_free(bio);
|
|
|
|
return false;
|
|
}
|
|
|
|
this->remoteCert = std::string(mem->data, mem->length);
|
|
|
|
X509_free(certificate);
|
|
BIO_free(bio);
|
|
|
|
return true;
|
|
}
|
|
|
|
inline void DtlsTransport::ExtractSrtpKeys(RTC::SrtpSession::CryptoSuite srtpCryptoSuite)
|
|
{
|
|
MS_TRACE();
|
|
|
|
size_t srtpKeyLength{ 0 };
|
|
size_t srtpSaltLength{ 0 };
|
|
size_t srtpMasterLength{ 0 };
|
|
|
|
switch (srtpCryptoSuite)
|
|
{
|
|
case RTC::SrtpSession::CryptoSuite::AES_CM_128_HMAC_SHA1_80:
|
|
case RTC::SrtpSession::CryptoSuite::AES_CM_128_HMAC_SHA1_32:
|
|
{
|
|
srtpKeyLength = SrtpMasterKeyLength;
|
|
srtpSaltLength = SrtpMasterSaltLength;
|
|
srtpMasterLength = SrtpMasterLength;
|
|
|
|
break;
|
|
}
|
|
|
|
case RTC::SrtpSession::CryptoSuite::AEAD_AES_256_GCM:
|
|
{
|
|
srtpKeyLength = SrtpAesGcm256MasterKeyLength;
|
|
srtpSaltLength = SrtpAesGcm256MasterSaltLength;
|
|
srtpMasterLength = SrtpAesGcm256MasterLength;
|
|
|
|
break;
|
|
}
|
|
|
|
case RTC::SrtpSession::CryptoSuite::AEAD_AES_128_GCM:
|
|
{
|
|
srtpKeyLength = SrtpAesGcm128MasterKeyLength;
|
|
srtpSaltLength = SrtpAesGcm128MasterSaltLength;
|
|
srtpMasterLength = SrtpAesGcm128MasterLength;
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
{
|
|
MS_ABORT("unknown SRTP crypto suite");
|
|
}
|
|
}
|
|
|
|
auto* srtpMaterial = new uint8_t[srtpMasterLength * 2];
|
|
uint8_t* srtpLocalKey{ nullptr };
|
|
uint8_t* srtpLocalSalt{ nullptr };
|
|
uint8_t* srtpRemoteKey{ nullptr };
|
|
uint8_t* srtpRemoteSalt{ nullptr };
|
|
auto* srtpLocalMasterKey = new uint8_t[srtpMasterLength];
|
|
auto* srtpRemoteMasterKey = new uint8_t[srtpMasterLength];
|
|
int ret;
|
|
|
|
ret = SSL_export_keying_material(
|
|
this->ssl, srtpMaterial, srtpMasterLength * 2, "EXTRACTOR-dtls_srtp", 19, nullptr, 0, 0);
|
|
|
|
MS_ASSERT(ret != 0, "SSL_export_keying_material() failed");
|
|
|
|
switch (this->localRole)
|
|
{
|
|
case Role::SERVER:
|
|
{
|
|
srtpRemoteKey = srtpMaterial;
|
|
srtpLocalKey = srtpRemoteKey + srtpKeyLength;
|
|
srtpRemoteSalt = srtpLocalKey + srtpKeyLength;
|
|
srtpLocalSalt = srtpRemoteSalt + srtpSaltLength;
|
|
|
|
break;
|
|
}
|
|
|
|
case Role::CLIENT:
|
|
{
|
|
srtpLocalKey = srtpMaterial;
|
|
srtpRemoteKey = srtpLocalKey + srtpKeyLength;
|
|
srtpLocalSalt = srtpRemoteKey + srtpKeyLength;
|
|
srtpRemoteSalt = srtpLocalSalt + srtpSaltLength;
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
{
|
|
MS_ABORT("no DTLS role set");
|
|
}
|
|
}
|
|
|
|
// Create the SRTP local master key.
|
|
std::memcpy(srtpLocalMasterKey, srtpLocalKey, srtpKeyLength);
|
|
std::memcpy(srtpLocalMasterKey + srtpKeyLength, srtpLocalSalt, srtpSaltLength);
|
|
// Create the SRTP remote master key.
|
|
std::memcpy(srtpRemoteMasterKey, srtpRemoteKey, srtpKeyLength);
|
|
std::memcpy(srtpRemoteMasterKey + srtpKeyLength, srtpRemoteSalt, srtpSaltLength);
|
|
|
|
// Set state and notify the listener.
|
|
this->state = DtlsState::CONNECTED;
|
|
this->listener->OnDtlsTransportConnected(
|
|
this,
|
|
srtpCryptoSuite,
|
|
srtpLocalMasterKey,
|
|
srtpMasterLength,
|
|
srtpRemoteMasterKey,
|
|
srtpMasterLength,
|
|
this->remoteCert);
|
|
|
|
delete[] srtpMaterial;
|
|
delete[] srtpLocalMasterKey;
|
|
delete[] srtpRemoteMasterKey;
|
|
}
|
|
|
|
inline RTC::SrtpSession::CryptoSuite DtlsTransport::GetNegotiatedSrtpCryptoSuite()
|
|
{
|
|
MS_TRACE();
|
|
|
|
RTC::SrtpSession::CryptoSuite negotiatedSrtpCryptoSuite = RTC::SrtpSession::CryptoSuite::NONE;
|
|
|
|
// Ensure that the SRTP crypto suite has been negotiated.
|
|
// NOTE: This is a OpenSSL type.
|
|
SRTP_PROTECTION_PROFILE* sslSrtpCryptoSuite = SSL_get_selected_srtp_profile(this->ssl);
|
|
|
|
if (!sslSrtpCryptoSuite)
|
|
return negotiatedSrtpCryptoSuite;
|
|
|
|
// Get the negotiated SRTP crypto suite.
|
|
for (auto& srtpCryptoSuite : DtlsTransport::srtpCryptoSuites)
|
|
{
|
|
SrtpCryptoSuiteMapEntry* cryptoSuiteEntry = std::addressof(srtpCryptoSuite);
|
|
|
|
if (std::strcmp(sslSrtpCryptoSuite->name, cryptoSuiteEntry->name) == 0)
|
|
{
|
|
MS_DEBUG_2TAGS(dtls, srtp, "chosen SRTP crypto suite: %s", cryptoSuiteEntry->name);
|
|
|
|
negotiatedSrtpCryptoSuite = cryptoSuiteEntry->cryptoSuite;
|
|
}
|
|
}
|
|
|
|
MS_ASSERT(
|
|
negotiatedSrtpCryptoSuite != RTC::SrtpSession::CryptoSuite::NONE,
|
|
"chosen SRTP crypto suite is not an available one");
|
|
|
|
return negotiatedSrtpCryptoSuite;
|
|
}
|
|
|
|
inline void DtlsTransport::OnSslInfo(int where, int ret)
|
|
{
|
|
MS_TRACE();
|
|
|
|
int w = where & -SSL_ST_MASK;
|
|
const char* role;
|
|
|
|
if ((w & SSL_ST_CONNECT) != 0)
|
|
role = "client";
|
|
else if ((w & SSL_ST_ACCEPT) != 0)
|
|
role = "server";
|
|
else
|
|
role = "undefined";
|
|
|
|
if ((where & SSL_CB_LOOP) != 0)
|
|
{
|
|
MS_DEBUG_TAG(dtls, "[role:%s, action:'%s']", role, SSL_state_string_long(this->ssl));
|
|
}
|
|
else if ((where & SSL_CB_ALERT) != 0)
|
|
{
|
|
const char* alertType;
|
|
|
|
switch (*SSL_alert_type_string(ret))
|
|
{
|
|
case 'W':
|
|
alertType = "warning";
|
|
break;
|
|
|
|
case 'F':
|
|
alertType = "fatal";
|
|
break;
|
|
|
|
default:
|
|
alertType = "undefined";
|
|
}
|
|
|
|
if ((where & SSL_CB_READ) != 0)
|
|
{
|
|
MS_WARN_TAG(dtls, "received DTLS %s alert: %s", alertType, SSL_alert_desc_string_long(ret));
|
|
}
|
|
else if ((where & SSL_CB_WRITE) != 0)
|
|
{
|
|
MS_DEBUG_TAG(dtls, "sending DTLS %s alert: %s", alertType, SSL_alert_desc_string_long(ret));
|
|
}
|
|
else
|
|
{
|
|
MS_DEBUG_TAG(dtls, "DTLS %s alert: %s", alertType, SSL_alert_desc_string_long(ret));
|
|
}
|
|
}
|
|
else if ((where & SSL_CB_EXIT) != 0)
|
|
{
|
|
if (ret == 0)
|
|
MS_DEBUG_TAG(dtls, "[role:%s, failed:'%s']", role, SSL_state_string_long(this->ssl));
|
|
else if (ret < 0)
|
|
MS_DEBUG_TAG(dtls, "role: %s, waiting:'%s']", role, SSL_state_string_long(this->ssl));
|
|
}
|
|
else if ((where & SSL_CB_HANDSHAKE_START) != 0)
|
|
{
|
|
MS_DEBUG_TAG(dtls, "DTLS handshake start");
|
|
}
|
|
else if ((where & SSL_CB_HANDSHAKE_DONE) != 0)
|
|
{
|
|
MS_DEBUG_TAG(dtls, "DTLS handshake done");
|
|
|
|
this->handshakeDoneNow = true;
|
|
}
|
|
|
|
// NOTE: checking SSL_get_shutdown(this->ssl) & SSL_RECEIVED_SHUTDOWN here upon
|
|
// receipt of a close alert does not work (the flag is set after this callback).
|
|
}
|
|
|
|
inline void DtlsTransport::OnTimer()
|
|
{
|
|
MS_TRACE();
|
|
|
|
// Workaround for https://github.com/openssl/openssl/issues/7998.
|
|
if (this->handshakeDone)
|
|
{
|
|
// MS_DEBUG_DEV("handshake is done so return");
|
|
return;
|
|
}
|
|
|
|
DTLSv1_handle_timeout(this->ssl);
|
|
|
|
// If required, send DTLS data.
|
|
SendPendingOutgoingDtlsData();
|
|
|
|
// Set the DTLS timer again.
|
|
SetTimeout();
|
|
}
|
|
} // namespace RTC
|