1 // Copyright 2021 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 #pragma once 16 17 #include "pw_preprocessor/compiler.h" 18 19 PW_MODIFY_DIAGNOSTICS_PUSH(); 20 PW_MODIFY_DIAGNOSTIC(ignored, "-Wswitch-enum"); 21 #include "mbedtls/certs.h" 22 #include "mbedtls/ctr_drbg.h" 23 #include "mbedtls/entropy.h" 24 #include "mbedtls/error.h" 25 #include "mbedtls/ssl.h" 26 PW_MODIFY_DIAGNOSTICS_POP(); 27 28 #include "pw_status/status.h" 29 #include "pw_tls_client/options.h" 30 31 namespace pw::tls_client::backend { 32 class SessionImplementation { 33 public: 34 SessionImplementation(SessionOptions options); 35 ~SessionImplementation(); 36 Status Setup(); SetTlsStatus(TLSStatus status)37 void SetTlsStatus(TLSStatus status) { tls_status_ = status; } GetTlsStatus()38 TLSStatus GetTlsStatus() { return tls_status_; } 39 40 // The method is for test only. When given a non-Ok status, it will override 41 // the status returned by entropy source pw::tls_client::GetRandomBytes(); 42 static void SetEntropySourceStatus(Status status); 43 44 private: 45 // mbedtls entropy 46 mbedtls_entropy_context entropy_ctx_; 47 mbedtls_ctr_drbg_context drbg_ctx_; 48 49 // SSL data structure 50 mbedtls_ssl_context ssl_ctx_; 51 52 // Configuration data structure 53 mbedtls_ssl_config ssl_config_; 54 55 // A copy of the option when creating the client. 56 SessionOptions session_options_; 57 58 TLSStatus tls_status_ = TLSStatus::kOk; 59 60 static int MbedTlsWrite(void* ctx, const uint8_t* buf, size_t len); 61 static int MbedTlsRead(void* ctx, unsigned char* buf, size_t len); 62 static int MbedTlsEntropySource(void* ctx, 63 unsigned char* out, 64 size_t len, 65 size_t* output_length); 66 67 static Status entropy_source_status_; 68 }; 69 70 } // namespace pw::tls_client::backend 71