1 // Copyright 2021 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://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, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 /////////////////////////////////////////////////////////////////////////////// 16 17 #include "tink/internal/fips_utils.h" 18 19 #include <atomic> 20 21 #include "absl/base/attributes.h" 22 #include "absl/status/status.h" 23 #include "openssl/crypto.h" 24 #include "tink/util/status.h" 25 26 namespace crypto { 27 namespace tink { 28 namespace internal { 29 30 #ifdef TINK_USE_ONLY_FIPS 31 ABSL_CONST_INIT const bool kUseOnlyFips = true; 32 #else 33 ABSL_CONST_INIT const bool kUseOnlyFips = false; 34 #endif 35 36 static std::atomic<bool> is_fips_restricted(false); 37 SetFipsRestricted()38void SetFipsRestricted() { is_fips_restricted = true; } 39 UnSetFipsRestricted()40void UnSetFipsRestricted() { is_fips_restricted = false; } 41 IsFipsModeEnabled()42bool IsFipsModeEnabled() { return kUseOnlyFips || is_fips_restricted; } 43 IsFipsEnabledInSsl()44bool IsFipsEnabledInSsl() { 45 #ifdef OPENSSL_IS_BORINGSSL 46 return FIPS_mode(); 47 #else 48 return false; 49 #endif 50 } 51 ChecksFipsCompatibility(FipsCompatibility fips_status)52util::Status ChecksFipsCompatibility(FipsCompatibility fips_status) { 53 switch (fips_status) { 54 case FipsCompatibility::kNotFips: 55 if (IsFipsModeEnabled()) { 56 return util::Status(absl::StatusCode::kInternal, 57 "Primitive not available in FIPS only mode."); 58 } else { 59 return util::OkStatus(); 60 } 61 case FipsCompatibility::kRequiresBoringCrypto: 62 if ((IsFipsModeEnabled()) && !IsFipsEnabledInSsl()) { 63 return util::Status( 64 absl::StatusCode::kInternal, 65 "BoringSSL not built with the BoringCrypto module. If you want to " 66 "use FIPS only mode you have to build BoringSSL in FIPS Mode."); 67 68 } else { 69 return util::OkStatus(); 70 } 71 default: 72 return util::Status(absl::StatusCode::kInternal, 73 "Could not determine FIPS status."); 74 } 75 } 76 77 } // namespace internal 78 } // namespace tink 79 } // namespace crypto 80