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diff --git a/src/ceph/src/rgw/rgw_auth_keystone.h b/src/ceph/src/rgw/rgw_auth_keystone.h
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+++ b/src/ceph/src/rgw/rgw_auth_keystone.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+
+#ifndef CEPH_RGW_AUTH_KEYSTONE_H
+#define CEPH_RGW_AUTH_KEYSTONE_H
+
+#include <utility>
+#include <boost/optional.hpp>
+#include <boost/utility/string_view.hpp>
+
+#include "rgw_auth.h"
+#include "rgw_rest_s3.h"
+#include "rgw_common.h"
+#include "rgw_keystone.h"
+
+namespace rgw {
+namespace auth {
+namespace keystone {
+
+/* Dedicated namespace for Keystone-related auth engines. We need it because
+ * Keystone offers three different authentication mechanisms (token, EC2 and
+ * regular user/pass). RadosGW actually does support the first two. */
+
+class TokenEngine : public rgw::auth::Engine {
+  CephContext* const cct;
+
+  using acl_strategy_t = rgw::auth::RemoteApplier::acl_strategy_t;
+  using auth_info_t = rgw::auth::RemoteApplier::AuthInfo;
+  using result_t = rgw::auth::Engine::result_t;
+  using token_envelope_t = rgw::keystone::TokenEnvelope;
+
+  const rgw::auth::TokenExtractor* const extractor;
+  const rgw::auth::RemoteApplier::Factory* const apl_factory;
+  rgw::keystone::Config& config;
+  rgw::keystone::TokenCache& token_cache;
+
+  /* Helper methods. */
+  bool is_applicable(const std::string& token) const noexcept;
+  token_envelope_t decode_pki_token(const std::string& token) const;
+
+  boost::optional<token_envelope_t>
+  get_from_keystone(const std::string& token) const;
+
+  acl_strategy_t get_acl_strategy(const token_envelope_t& token) const;
+  auth_info_t get_creds_info(const token_envelope_t& token,
+                             const std::vector<std::string>& admin_roles
+                            ) const noexcept;
+  result_t authenticate(const std::string& token,
+                        const req_state* s) const;
+
+public:
+  TokenEngine(CephContext* const cct,
+              const rgw::auth::TokenExtractor* const extractor,
+              const rgw::auth::RemoteApplier::Factory* const apl_factory,
+              rgw::keystone::Config& config,
+              rgw::keystone::TokenCache& token_cache)
+    : cct(cct),
+      extractor(extractor),
+      apl_factory(apl_factory),
+      config(config),
+      token_cache(token_cache) {
+  }
+
+  const char* get_name() const noexcept override {
+    return "rgw::auth::keystone::TokenEngine";
+  }
+
+  result_t authenticate(const req_state* const s) const override {
+    return authenticate(extractor->get_token(s), s);
+  }
+}; /* class TokenEngine */
+
+
+class EC2Engine : public rgw::auth::s3::AWSEngine {
+  using acl_strategy_t = rgw::auth::RemoteApplier::acl_strategy_t;
+  using auth_info_t = rgw::auth::RemoteApplier::AuthInfo;
+  using result_t = rgw::auth::Engine::result_t;
+  using token_envelope_t = rgw::keystone::TokenEnvelope;
+
+  const rgw::auth::RemoteApplier::Factory* const apl_factory;
+  rgw::keystone::Config& config;
+  rgw::keystone::TokenCache& token_cache;
+
+  /* Helper methods. */
+  acl_strategy_t get_acl_strategy(const token_envelope_t& token) const;
+  auth_info_t get_creds_info(const token_envelope_t& token,
+                             const std::vector<std::string>& admin_roles
+                            ) const noexcept;
+  std::pair<boost::optional<token_envelope_t>, int>
+  get_from_keystone(const boost::string_view& access_key_id,
+                    const std::string& string_to_sign,
+                    const boost::string_view& signature) const;
+  result_t authenticate(const boost::string_view& access_key_id,
+                        const boost::string_view& signature,
+                        const string_to_sign_t& string_to_sign,
+                        const signature_factory_t&,
+                        const completer_factory_t& completer_factory,
+                        const req_state* s) const override;
+public:
+  EC2Engine(CephContext* const cct,
+            const rgw::auth::s3::AWSEngine::VersionAbstractor* const ver_abstractor,
+            const rgw::auth::RemoteApplier::Factory* const apl_factory,
+            rgw::keystone::Config& config,
+            /* The token cache is used ONLY for the retrieving admin token.
+             * Due to the architecture of AWS Auth S3 credentials cannot be
+             * cached at all. */
+            rgw::keystone::TokenCache& token_cache)
+    : AWSEngine(cct, *ver_abstractor),
+      apl_factory(apl_factory),
+      config(config),
+      token_cache(token_cache) {
+  }
+
+  using AWSEngine::authenticate;
+
+  const char* get_name() const noexcept override {
+    return "rgw::auth::keystone::EC2Engine";
+  }
+
+}; /* class EC2Engine */
+
+}; /* namespace keystone */
+}; /* namespace auth */
+}; /* namespace rgw */
+
+#endif /* CEPH_RGW_AUTH_KEYSTONE_H */