diff options
Diffstat (limited to 'crypto/openssl_util.cc')
-rw-r--r-- | crypto/openssl_util.cc | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/crypto/openssl_util.cc b/crypto/openssl_util.cc new file mode 100644 index 0000000000..964d83b843 --- /dev/null +++ b/crypto/openssl_util.cc @@ -0,0 +1,132 @@ +// Copyright (c) 2011 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#include "crypto/openssl_util.h" + +#include <openssl/err.h> +#include <openssl/ssl.h> +#include <openssl/cpu.h> + +#include "base/logging.h" +#include "base/memory/scoped_vector.h" +#include "base/memory/singleton.h" +#include "base/strings/string_piece.h" +#include "base/synchronization/lock.h" +#include "build/build_config.h" + +#if defined(OS_ANDROID) && defined(ARCH_CPU_ARMEL) +#include <cpu-features.h> +#include "base/cpu.h" +#endif + +namespace crypto { + +namespace { + +void CurrentThreadId(CRYPTO_THREADID* id) { + CRYPTO_THREADID_set_numeric( + id, static_cast<unsigned long>(base::PlatformThread::CurrentId())); +} + +// Singleton for initializing and cleaning up the OpenSSL library. +class OpenSSLInitSingleton { + public: + static OpenSSLInitSingleton* GetInstance() { + // We allow the SSL environment to leak for multiple reasons: + // - it is used from a non-joinable worker thread that is not stopped on + // shutdown, hence may still be using OpenSSL library after the AtExit + // runner has completed. + // - There are other OpenSSL related singletons (e.g. the client socket + // context) who's cleanup depends on the global environment here, but + // we can't control the order the AtExit handlers will run in so + // allowing the global environment to leak at least ensures it is + // available for those other singletons to reliably cleanup. + return Singleton<OpenSSLInitSingleton, + LeakySingletonTraits<OpenSSLInitSingleton> >::get(); + } + private: + friend struct DefaultSingletonTraits<OpenSSLInitSingleton>; + OpenSSLInitSingleton() { +#if defined(OS_ANDROID) && defined(ARCH_CPU_ARMEL) + const bool has_neon = + (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0; + // CRYPTO_set_NEON_capable is called before |SSL_library_init| because this + // stops BoringSSL from probing for NEON support via SIGILL in the case + // that getauxval isn't present. + CRYPTO_set_NEON_capable(has_neon); + // See https://code.google.com/p/chromium/issues/detail?id=341598 + base::CPU cpu; + CRYPTO_set_NEON_functional(!cpu.has_broken_neon()); +#endif + + SSL_load_error_strings(); + SSL_library_init(); + int num_locks = CRYPTO_num_locks(); + locks_.reserve(num_locks); + for (int i = 0; i < num_locks; ++i) + locks_.push_back(new base::Lock()); + CRYPTO_set_locking_callback(LockingCallback); + CRYPTO_THREADID_set_callback(CurrentThreadId); + } + + ~OpenSSLInitSingleton() { + CRYPTO_set_locking_callback(NULL); + EVP_cleanup(); + ERR_free_strings(); + } + + static void LockingCallback(int mode, int n, const char* file, int line) { + OpenSSLInitSingleton::GetInstance()->OnLockingCallback(mode, n, file, line); + } + + void OnLockingCallback(int mode, int n, const char* file, int line) { + CHECK_LT(static_cast<size_t>(n), locks_.size()); + if (mode & CRYPTO_LOCK) + locks_[n]->Acquire(); + else + locks_[n]->Release(); + } + + // These locks are used and managed by OpenSSL via LockingCallback(). + ScopedVector<base::Lock> locks_; + + DISALLOW_COPY_AND_ASSIGN(OpenSSLInitSingleton); +}; + +// Callback routine for OpenSSL to print error messages. |str| is a +// NULL-terminated string of length |len| containing diagnostic information +// such as the library, function and reason for the error, the file and line +// where the error originated, plus potentially any context-specific +// information about the error. |context| contains a pointer to user-supplied +// data, which is currently unused. +// If this callback returns a value <= 0, OpenSSL will stop processing the +// error queue and return, otherwise it will continue calling this function +// until all errors have been removed from the queue. +int OpenSSLErrorCallback(const char* str, size_t len, void* context) { + DVLOG(1) << "\t" << base::StringPiece(str, len); + return 1; +} + +} // namespace + +void EnsureOpenSSLInit() { + (void)OpenSSLInitSingleton::GetInstance(); +} + +void ClearOpenSSLERRStack(const tracked_objects::Location& location) { + if (logging::DEBUG_MODE && VLOG_IS_ON(1)) { + uint32_t error_num = ERR_peek_error(); + if (error_num == 0) + return; + + std::string message; + location.Write(true, true, &message); + DVLOG(1) << "OpenSSL ERR_get_error stack from " << message; + ERR_print_errors_cb(&OpenSSLErrorCallback, NULL); + } else { + ERR_clear_error(); + } +} + +} // namespace crypto |