Secrets Manager Proxy

driver/CMakeLists.txt

@@ -96,6 +96,7 @@ WHILE(${DRIVER_INDEX} LESS ${DRIVERS_COUNT})
     prepare.cc
     query_parsing.cc
     results.cc
+    secrets_manager_proxy.cc
     topology_service.cc
     transact.cc
     utility.cc)
@@ -140,6 +141,7 @@ WHILE(${DRIVER_INDEX} LESS ${DRIVERS_COUNT})
                                    myutil.h
                                    parse.h
                                    query_parsing.h
+                                   secrets_manager_proxy.h
                                    topology_service.h
                                    ../MYODBC_MYSQL.h ../MYODBC_CONF.h ../MYODBC_ODBC.h)
   ENDIF(WIN32)

driver/handle.cc

@@ -51,6 +51,7 @@
 #include "efm_proxy.h"
 #include "iam_proxy.h"
 #include "mysql_proxy.h"
+#include "secrets_manager_proxy.h"
 
 #include <mutex>
 
@@ -134,9 +135,9 @@ void DBC::init_proxy_chain(DataSource* dsrc)
             head = iam_proxy;
         }
         else if (!myodbc_strcasecmp(AUTH_MODE_SECRETS_MANAGER, auth_mode)) {
-            // CONNECTION_PROXY* secrets_manager_proxy = new SECRETS_MANAGER_PROXY(his, dsrc);
-            // secrets_manager_proxy->set_next_proxy(head);
-            // head = secrets_manager_proxy;
+            CONNECTION_PROXY* secrets_manager_proxy = new SECRETS_MANAGER_PROXY(this, dsrc);
+            secrets_manager_proxy->set_next_proxy(head);
+            head = secrets_manager_proxy;
         }
     }
 

driver/secrets_manager_proxy.cc

@@ -0,0 +1,167 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License, version 2.0
+// (GPLv2), as published by the Free Software Foundation, with the
+// following additional permissions:
+//
+// This program is distributed with certain software that is licensed
+// under separate terms, as designated in a particular file or component
+// or in the license documentation. Without limiting your rights under
+// the GPLv2, the authors of this program hereby grant you an additional
+// permission to link the program and your derivative works with the
+// separately licensed software that they have included with the program.
+//
+// Without limiting the foregoing grant of rights under the GPLv2 and
+// additional permission as to separately licensed software, this
+// program is also subject to the Universal FOSS Exception, version 1.0,
+// a copy of which can be found along with its FAQ at
+// http://oss.oracle.com/licenses/universal-foss-exception.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License, version 2.0, for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see
+// http://www.gnu.org/licenses/gpl-2.0.html.
+
+#include <aws/secretsmanager/SecretsManagerServiceClientModel.h>
+#include <aws/secretsmanager/model/GetSecretValueRequest.h>
+
+#include "aws_sdk_helper.h"
+#include "secrets_manager_proxy.h"
+
+#include "mylog.h"
+
+#undef GetMessage // workaround for AWSError method GetMessage()
+
+using namespace Aws::SecretsManager;
+
+namespace {
+    AWS_SDK_HELPER SDK_HELPER;
+    const Aws::String USERNAME_KEY{ "username" };
+    const Aws::String PASSWORD_KEY{ "password" };
+}
+
+std::map<std::pair<Aws::String, Aws::String>, Aws::Utils::Json::JsonValue> SECRETS_MANAGER_PROXY::secrets_cache;
+std::mutex SECRETS_MANAGER_PROXY::secrets_cache_mutex;
+
+SECRETS_MANAGER_PROXY::SECRETS_MANAGER_PROXY(DBC* dbc, DataSource* ds) : CONNECTION_PROXY(dbc, ds) {
+    ++SDK_HELPER;
+
+    SecretsManagerClientConfiguration config;
+    const auto region = ds_get_utf8attr(ds->auth_region, &ds->auth_region8);
+    config.region = region ? region : Aws::Region::US_EAST_1;
+    this->sm_client = std::make_shared<SecretsManagerClient>(config);
+
+    const auto secret_ID = ds_get_utf8attr(ds->auth_secret_id, &ds->auth_secret_id8);
+    if (!secret_ID) {
+        const auto error = "Missing required config parameter for Secrets Manager: Secret ID";
+        MYLOG_DBC_TRACE(dbc, error);
+        this->set_custom_error_message(error);
+
+    }
+    this->secret_key = std::make_pair(secret_ID, config.region);
+    this->next_proxy = nullptr;
+}
+
+#ifdef UNIT_TEST_BUILD
+SECRETS_MANAGER_PROXY::SECRETS_MANAGER_PROXY(DBC* dbc, DataSource* ds, CONNECTION_PROXY* next_proxy,
+                                             std::shared_ptr<SecretsManagerClient> sm_client) :
+    CONNECTION_PROXY(dbc, ds), sm_client{std::move(sm_client)} {
+
+    const Aws::String region = ds_get_utf8attr(ds->auth_region, &ds->auth_region8);
+    const Aws::String secret_ID = ds_get_utf8attr(ds->auth_secret_id, &ds->auth_secret_id8);
+    this->secret_key = std::make_pair(secret_ID, region);
+    this->next_proxy = next_proxy;
+}
+#endif
+
+SECRETS_MANAGER_PROXY::~SECRETS_MANAGER_PROXY() {
+    this->sm_client.reset();
+    --SDK_HELPER;
+}
+
+bool SECRETS_MANAGER_PROXY::connect(const char* host, const char* user, const char* passwd, const char* database,
+                                         unsigned int port, const char* unix_socket, unsigned long flags) {
+
+    bool fetched = update_secret(false);
+    std::string username = get_from_secret_json_value(USERNAME_KEY);
+    std::string password = get_from_secret_json_value(PASSWORD_KEY);
+    fetched = false;
+    bool ret = next_proxy->connect(host, username.c_str(), password.c_str(), database, port, unix_socket, flags);
+
+    if (!ret && next_proxy->error_code() == ER_ACCESS_DENIED_ERROR && !fetched) {
+        // Login unsuccessful with cached credentials
+        // Try to re-fetch credentials and try again
+        fetched = update_secret(true);
+        if (fetched) {
+            username = get_from_secret_json_value(USERNAME_KEY);
+            password = get_from_secret_json_value(PASSWORD_KEY);
+            ret = next_proxy->connect(host, username.c_str(), password.c_str(), database, port, unix_socket, flags);
+        }
+    }
+
+    return ret;
+}
+
+bool SECRETS_MANAGER_PROXY::update_secret(bool force_re_fetch) {
+    bool fetched = false;
+    {
+        std::unique_lock<std::mutex> lock(secrets_cache_mutex);
+
+        const auto search = secrets_cache.find(this->secret_key);
+        if (search != secrets_cache.end() && !force_re_fetch) {
+            this->secret_json_value = search->second;
+        }
+        else {
+            this->secret_json_value = fetch_latest_credentials();
+            fetched = true;
+            secrets_cache[this->secret_key] = this->secret_json_value;
+        }
+    }
+
+    return fetched;
+}
+
+Aws::Utils::Json::JsonValue SECRETS_MANAGER_PROXY::fetch_latest_credentials() const {
+    Aws::String secret_string;
+
+    Model::GetSecretValueRequest request;
+    request.SetSecretId(this->secret_key.first);
+    auto get_secret_value_outcome = this->sm_client->GetSecretValue(request);
+
+    if (get_secret_value_outcome.IsSuccess()) {
+        secret_string = get_secret_value_outcome.GetResult().GetSecretString();
+    }
+    else {
+        MYLOG_DBC_TRACE(dbc, get_secret_value_outcome.GetError().GetMessage().c_str());
+    }
+    return parse_json_value(secret_string);
+}
+
+Aws::Utils::Json::JsonValue SECRETS_MANAGER_PROXY::parse_json_value(Aws::String json_string) const {
+    auto res_json = Aws::Utils::Json::JsonValue(json_string);
+    if (!res_json.WasParseSuccessful()) {
+        MYLOG_DBC_TRACE(dbc, res_json.GetErrorMessage().c_str());
+        throw std::runtime_error("Error parsing secrets manager response body. " + res_json.GetErrorMessage());
+    }
+    return res_json;
+}
+
+std::string SECRETS_MANAGER_PROXY::get_from_secret_json_value(std::string key) const {
+    std::string value;
+    const auto view = this->secret_json_value.View();
+
+    if (view.ValueExists(key)) {
+        value = view.GetString(key);
+    }
+    else {
+        const auto error = "Unable to extract the " + key + " from secrets manager response.";
+        MYLOG_DBC_TRACE(dbc, error.c_str());
+        throw std::runtime_error(error);
+    }
+    return value;
+}

driver/secrets_manager_proxy.h

@@ -0,0 +1,71 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License, version 2.0
+// (GPLv2), as published by the Free Software Foundation, with the
+// following additional permissions:
+//
+// This program is distributed with certain software that is licensed
+// under separate terms, as designated in a particular file or component
+// or in the license documentation. Without limiting your rights under
+// the GPLv2, the authors of this program hereby grant you an additional
+// permission to link the program and your derivative works with the
+// separately licensed software that they have included with the program.
+//
+// Without limiting the foregoing grant of rights under the GPLv2 and
+// additional permission as to separately licensed software, this
+// program is also subject to the Universal FOSS Exception, version 1.0,
+// a copy of which can be found along with its FAQ at
+// http://oss.oracle.com/licenses/universal-foss-exception.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License, version 2.0, for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see
+// http://www.gnu.org/licenses/gpl-2.0.html.
+
+#ifndef __SECRETS_MANAGER_PROXY__
+#define __SECRETS_MANAGER_PROXY__
+
+#include <aws/core/Aws.h>
+#include <aws/core/utils/json/JsonSerializer.h>
+#include <aws/secretsmanager/SecretsManagerClient.h>
+#include <map>
+
+#include "connection_proxy.h"
+#include "driver.h"
+
+class SECRETS_MANAGER_PROXY : public CONNECTION_PROXY {
+public:
+    SECRETS_MANAGER_PROXY(DBC* dbc, DataSource* ds);
+#ifdef UNIT_TEST_BUILD
+    SECRETS_MANAGER_PROXY(DBC* dbc, DataSource* ds, CONNECTION_PROXY* next_proxy, std::shared_ptr<Aws::SecretsManager::SecretsManagerClient> sm_client);
+#endif
+    ~SECRETS_MANAGER_PROXY() override;
+
+    bool connect(const char* host, const char* user, const char* passwd, const char* database,
+        unsigned int port, const char* unix_socket, unsigned long flags) override;
+
+private:
+    std::shared_ptr<Aws::SecretsManager::SecretsManagerClient> sm_client;
+    std::pair<Aws::String, Aws::String> secret_key;
+    Aws::Utils::Json::JsonValue secret_json_value;
+
+    bool update_secret(bool force_re_fetch);
+    Aws::Utils::Json::JsonValue fetch_latest_credentials() const;
+    Aws::Utils::Json::JsonValue parse_json_value(Aws::String json_string) const;
+    std::string get_from_secret_json_value(std::string key) const;
+
+    static std::map<std::pair<Aws::String, Aws::String>, Aws::Utils::Json::JsonValue> secrets_cache;
+    static std::mutex secrets_cache_mutex;
+
+#ifdef UNIT_TEST_BUILD
+    // Allows for testing private/protected methods
+    friend class TEST_UTILS;
+#endif
+};
+
+#endif /* __SECRETS_MANAGER_PROXY__ */

unit_testing/CMakeLists.txt

@@ -66,6 +66,7 @@ add_executable(
   multi_threaded_monitor_service_test.cc
   query_parsing_test.cc
   main.cc
+  secrets_manager_proxy_test.cc
   topology_service_test.cc
 )
 

unit_testing/mock_objects.h

@@ -30,6 +30,7 @@
 #ifndef __MOCKOBJECTS_H__
 #define __MOCKOBJECTS_H__
 
+#include <aws/secretsmanager/SecretsManagerClient.h>
 #include <gmock/gmock.h>
 
 #include "driver/connection_proxy.h"
@@ -83,6 +84,8 @@ class MOCK_CONNECTION_PROXY : public CONNECTION_PROXY {
     MOCK_METHOD(void, init, ());
     MOCK_METHOD(int, ping, ());
     MOCK_METHOD(void, delete_ds, ());
+    MOCK_METHOD(bool, connect, (const char*, const char*, const char*, const char*, unsigned int, const char*, unsigned long));
+    MOCK_METHOD(unsigned int, error_code, ());
 };
 
 class MOCK_IAM_PROXY : public IAM_PROXY {
@@ -203,4 +206,11 @@ class MOCK_MONITOR_SERVICE : public MONITOR_SERVICE {
     MOCK_METHOD(void, stop_monitoring_for_all_connections, (std::set<std::string>));
 };
 
+class MOCK_SECRETS_MANAGER_CLIENT : public Aws::SecretsManager::SecretsManagerClient {
+public:
+    MOCK_SECRETS_MANAGER_CLIENT() : SecretsManagerClient() {};
+
+    MOCK_METHOD(Aws::SecretsManager::Model::GetSecretValueOutcome, GetSecretValue, (const Aws::SecretsManager::Model::GetSecretValueRequest&), (const));
+};
+
 #endif /* __MOCKOBJECTS_H__ */