1 files changed, 215 insertions, 0 deletions
diff --git a/src/common/ceph_crypto.cc b/src/common/ceph_crypto.cc
new file mode 100644
index 000000000..e1f8705c9
--- /dev/null
+++ b/src/common/ceph_crypto.cc
@@ -0,0 +1,215 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2010-2011 Dreamhost
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include <vector>
+
+#include "common/ceph_context.h"
+#include "common/ceph_mutex.h"
+#include "common/config.h"
+#include "ceph_crypto.h"
+
+#include <openssl/evp.h>
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#  include <openssl/conf.h>
+#  include <openssl/engine.h>
+#  include <openssl/err.h>
+#endif /* OPENSSL_VERSION_NUMBER < 0x10100000L */
+
+namespace TOPNSPC::crypto::ssl {
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+static std::atomic_uint32_t crypto_refs;
+
+
+static auto ssl_mutexes = ceph::make_lock_container<ceph::shared_mutex>(
+  static_cast<size_t>(std::max(CRYPTO_num_locks(), 0)),
+  [](const size_t i) {
+    return ceph::make_shared_mutex(
+      std::string("ssl-mutex-") + std::to_string(i));
+  });
+
+static struct {
+  // we could use e.g. unordered_set instead at the price of providing
+  // std::hash<...> specialization. However, we can live with duplicates
+  // quite well while the benefit is not worth the effort.
+  std::vector<CRYPTO_THREADID> tids;
+  ceph::mutex lock = ceph::make_mutex("crypto::ssl::init_records::lock");;
+} init_records;
+
+static void
+ssl_locking_callback(
+  const int mode,
+  const int mutex_num,
+  [[maybe_unused]] const char *file,
+  [[maybe_unused]] const int line)
+{
+  if (mutex_num < 0 || static_cast<size_t>(mutex_num) >= ssl_mutexes.size()) {
+    ceph_assert_always("openssl passed wrong mutex index" == nullptr);
+  }
+
+  if (mode & CRYPTO_READ) {
+    if (mode & CRYPTO_LOCK) {
+      ssl_mutexes[mutex_num].lock_shared();
+    } else if (mode & CRYPTO_UNLOCK) {
+      ssl_mutexes[mutex_num].unlock_shared();
+    }
+  } else if (mode & CRYPTO_WRITE) {
+    if (mode & CRYPTO_LOCK) {
+      ssl_mutexes[mutex_num].lock();
+    } else if (mode & CRYPTO_UNLOCK) {
+      ssl_mutexes[mutex_num].unlock();
+    }
+  }
+}
+
+static unsigned long
+ssl_get_thread_id(void)
+{
+  static_assert(sizeof(unsigned long) >= sizeof(pthread_t));
+  /* pthread_t may be any data type, so a simple cast to unsigned long
+   * can rise a warning/error, depending on the platform.
+   * Here memcpy is used as an anything-to-anything cast. */
+  unsigned long ret = 0;
+  pthread_t t = pthread_self();
+  memcpy(&ret, &t, sizeof(pthread_t));
+  return ret;
+}
+#endif /* not OPENSSL_VERSION_NUMBER < 0x10100000L */
+
+static void init() {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  if (++crypto_refs == 1) {
+    // according to
+    // https://wiki.openssl.org/index.php/Library_Initialization#libcrypto_Initialization
+    OpenSSL_add_all_algorithms();
+    ERR_load_crypto_strings();
+
+    // initialize locking callbacks, needed for thread safety.
+    // http://www.openssl.org/support/faq.html#PROG1
+    CRYPTO_set_locking_callback(&ssl_locking_callback);
+    CRYPTO_set_id_callback(&ssl_get_thread_id);
+
+    OPENSSL_config(nullptr);
+  }
+
+  // we need to record IDs of all threads calling the initialization in
+  // order to *manually* free per-thread memory OpenSSL *automagically*
+  // allocated in ERR_get_state().
+  // XXX: this solution/nasty hack is IMPERFECT. A leak will appear when
+  // a client init()ializes the crypto subsystem with one thread and then
+  // uses it from another one in a way that results in ERR_get_state().
+  // XXX: for discussion about another approaches please refer to:
+  // https://www.mail-archive.com/openssl-users@openssl.org/msg59070.html
+  {
+    std::lock_guard l(init_records.lock);
+    CRYPTO_THREADID tmp;
+    CRYPTO_THREADID_current(&tmp);
+    init_records.tids.emplace_back(std::move(tmp));
+  }
+#endif /* OPENSSL_VERSION_NUMBER < 0x10100000L */
+}
+
+static void shutdown() {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  if (--crypto_refs != 0) {
+    return;
+  }
+
+  // drop error queue for each thread that called the init() function to
+  // satisfy valgrind.
+  {
+    std::lock_guard l(init_records.lock);
+
+    // NOTE: in OpenSSL 1.0.2g the signature is:
+    //    void ERR_remove_thread_state(const CRYPTO_THREADID *tid);
+    // but in 1.1.0j it has been changed to
+    //    void ERR_remove_thread_state(void *);
+    // We're basing on the OPENSSL_VERSION_NUMBER check to preserve
+    // const-correctness without failing builds on modern envs.
+    for (const auto& tid : init_records.tids) {
+      ERR_remove_thread_state(&tid);
+    }
+  }
+
+  // Shutdown according to
+  // https://wiki.openssl.org/index.php/Library_Initialization#Cleanup
+  // http://stackoverflow.com/questions/29845527/how-to-properly-uninitialize-openssl
+  //
+  // The call to CONF_modules_free() has been introduced after a valgring run.
+  CRYPTO_set_locking_callback(nullptr);
+  CRYPTO_set_id_callback(nullptr);
+  ENGINE_cleanup();
+  CONF_modules_free();
+  CONF_modules_unload(1);
+  ERR_free_strings();
+  EVP_cleanup();
+  CRYPTO_cleanup_all_ex_data();
+
+  // NOTE: don't clear ssl_mutexes as we should be ready for init-deinit-init
+  // sequence.
+#endif /* OPENSSL_VERSION_NUMBER < 0x10100000L */
+}
+
+void zeroize_for_security(void* const s, const size_t n) {
+  OPENSSL_cleanse(s, n);
+}
+
+} // namespace TOPNSPC::crypto::openssl
+
+
+namespace TOPNSPC::crypto {
+void init() {
+  ssl::init();
+}
+
+void shutdown([[maybe_unused]] const bool shared) {
+  ssl::shutdown();
+}
+
+void zeroize_for_security(void* const s, const size_t n) {
+  ssl::zeroize_for_security(s, n);
+}
+
+ssl::OpenSSLDigest::OpenSSLDigest(const EVP_MD * _type)
+  : mpContext(EVP_MD_CTX_create())
+  , mpType(_type) {
+  this->Restart();
+}
+
+ssl::OpenSSLDigest::~OpenSSLDigest() {
+  EVP_MD_CTX_destroy(mpContext);
+}
+
+void ssl::OpenSSLDigest::Restart() {
+  EVP_DigestInit_ex(mpContext, mpType, NULL);
+}
+
+void ssl::OpenSSLDigest::SetFlags(int flags) {
+  EVP_MD_CTX_set_flags(mpContext, flags);
+  this->Restart();
+}
+
+void ssl::OpenSSLDigest::Update(const unsigned char *input, size_t length) {
+  if (length) {
+    EVP_DigestUpdate(mpContext, const_cast<void *>(reinterpret_cast<const void *>(input)), length);
+  }
+}
+
+void ssl::OpenSSLDigest::Final(unsigned char *digest) {
+  unsigned int s;
+  EVP_DigestFinal_ex(mpContext, digest, &s);
+}
+
+}