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storage_object_csek_samples.cc
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storage_object_csek_samples.cc
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "google/cloud/storage/client.h"
#include "google/cloud/storage/examples/storage_examples_common.h"
#include "google/cloud/storage/parallel_upload.h"
#include "google/cloud/credentials.h"
#include "google/cloud/internal/getenv.h"
#include <iostream>
#include <map>
#include <random>
#include <string>
#include <thread>
#include <utility>
#include <vector>
namespace {
std::string GenerateEncryptionKey() {
//! [generate encryption key] [START storage_generate_encryption_key]
// Create a pseudo-random number generator (PRNG), this is included for
// demonstration purposes only. You should consult your security team about
// best practices to initialize PRNG. In particular, you should verify that
// the C++ library and operating system provide enough entropy to meet the
// security policies in your organization.
// Use the Mersenne-Twister Engine in this example:
// https://en.cppreference.com/w/cpp/numeric/random/mersenne_twister_engine
// Any C++ PRNG can be used below, the choice is arbitrary.
using GeneratorType = std::mt19937_64;
// Create the default random device to fetch entropy.
std::random_device rd;
// Compute how much entropy we need to initialize the GeneratorType:
constexpr auto kRequiredEntropyWords =
GeneratorType::state_size *
(GeneratorType::word_size / std::numeric_limits<unsigned int>::digits);
// Capture the entropy bits into a vector.
std::vector<std::uint64_t> entropy(kRequiredEntropyWords);
std::generate(entropy.begin(), entropy.end(), [&rd] { return rd(); });
// Create the PRNG with the fetched entropy.
std::seed_seq seed(entropy.begin(), entropy.end());
// initialized with enough entropy such that the encryption keys are not
// predictable. Note that the default constructor for all the generators in
// the C++ standard library produce predictable keys.
std::mt19937_64 gen(seed);
namespace gcs = ::google::cloud::storage;
gcs::EncryptionKeyData data = gcs::CreateKeyFromGenerator(gen);
std::cout << "Base64 encoded key = " << data.key << "\n"
<< "Base64 encoded SHA256 of key = " << data.sha256 << "\n";
//! [generate encryption key] [END storage_generate_encryption_key]
return data.key;
}
void GenerateEncryptionKeyCommand(std::vector<std::string> const& argv) {
if (!argv.empty() || argv.front() == "--help") {
throw google::cloud::storage::examples::Usage{"generate-encryption-key"};
}
GenerateEncryptionKey();
}
void WriteEncryptedObject(google::cloud::storage::Client client,
std::vector<std::string> const& argv) {
//! [insert encrypted object] [START storage_upload_encrypted_file]
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name,
std::string const& object_name, std::string const& base64_aes256_key) {
StatusOr<gcs::ObjectMetadata> object_metadata = client.InsertObject(
bucket_name, object_name, "top secret",
gcs::EncryptionKey::FromBase64Key(base64_aes256_key));
if (!object_metadata) throw std::move(object_metadata).status();
std::cout << "The object " << object_metadata->name()
<< " was created in bucket " << object_metadata->bucket()
<< "\nFull metadata: " << *object_metadata << "\n";
}
//! [insert encrypted object] [END storage_upload_encrypted_file]
(std::move(client), argv.at(0), argv.at(1), argv.at(2));
}
void ReadEncryptedObject(google::cloud::storage::Client client,
std::vector<std::string> const& argv) {
//! [read encrypted object] [START storage_download_encrypted_file]
namespace gcs = ::google::cloud::storage;
[](gcs::Client client, std::string const& bucket_name,
std::string const& object_name, std::string const& base64_aes256_key) {
gcs::ObjectReadStream stream =
client.ReadObject(bucket_name, object_name,
gcs::EncryptionKey::FromBase64Key(base64_aes256_key));
std::string data(std::istreambuf_iterator<char>{stream}, {});
if (stream.bad()) throw google::cloud::Status(stream.status());
std::cout << "The object contents are: " << data << "\n";
}
//! [read encrypted object] [END storage_download_encrypted_file]
(std::move(client), argv.at(0), argv.at(1), argv.at(2));
}
void ComposeObjectFromEncryptedObjects(google::cloud::storage::Client client,
std::vector<std::string> const& argv) {
auto it = argv.cbegin();
auto bucket_name = *it++;
auto destination_object_name = *it++;
auto base64_aes256_key = *it++;
std::vector<google::cloud::storage::ComposeSourceObject> compose_objects;
do {
// NOLINTNEXTLINE(modernize-use-emplace) - brace initialization
compose_objects.push_back({*it++, {}, {}});
} while (it != argv.cend());
//! [compose object csek]
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name,
std::string const& destination_object_name,
std::string const& base64_aes256_key,
std::vector<gcs::ComposeSourceObject> const& compose_objects) {
StatusOr<gcs::ObjectMetadata> composed_object = client.ComposeObject(
bucket_name, compose_objects, destination_object_name,
gcs::EncryptionKey::FromBase64Key(base64_aes256_key));
if (!composed_object) throw std::move(composed_object).status();
std::cout << "Composed new object " << composed_object->name()
<< " in bucket " << composed_object->bucket()
<< "\nFull metadata: " << *composed_object << "\n";
}
//! [compose object csek]
(std::move(client), bucket_name, destination_object_name, base64_aes256_key,
std::move(compose_objects));
}
void CopyEncryptedObject(google::cloud::storage::Client client,
std::vector<std::string> const& argv) {
//! [copy encrypted object]
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& source_bucket_name,
std::string const& source_object_name,
std::string const& destination_bucket_name,
std::string const& destination_object_name,
std::string const& key_base64) {
StatusOr<gcs::ObjectMetadata> new_copy_meta = client.CopyObject(
source_bucket_name, source_object_name, destination_bucket_name,
destination_object_name, gcs::EncryptionKey::FromBase64Key(key_base64));
if (!new_copy_meta) throw std::move(new_copy_meta).status();
std::cout << "Successfully copied " << source_object_name << " in bucket "
<< source_bucket_name << " to bucket " << new_copy_meta->bucket()
<< " with name " << new_copy_meta->name()
<< ".\nThe full metadata after the copy is: " << *new_copy_meta
<< "\n";
}
//! [copy encrypted object]
(std::move(client), argv.at(0), argv.at(1), argv.at(2), argv.at(3),
argv.at(4));
}
void RotateEncryptionKey(google::cloud::storage::Client client,
std::vector<std::string> const& argv) {
//! [rotate encryption key] [START storage_rotate_encryption_key]
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name,
std::string const& object_name, std::string const& old_key_base64,
std::string const& new_key_base64) {
StatusOr<gcs::ObjectMetadata> object_metadata =
client.RewriteObjectBlocking(
bucket_name, object_name, bucket_name, object_name,
gcs::SourceEncryptionKey::FromBase64Key(old_key_base64),
gcs::EncryptionKey::FromBase64Key(new_key_base64));
if (!object_metadata) throw std::move(object_metadata).status();
std::cout << "Rotated key on object " << object_metadata->name()
<< " in bucket " << object_metadata->bucket()
<< "\nFull Metadata: " << *object_metadata << "\n";
}
//! [rotate encryption key] [END storage_rotate_encryption_key]
(std::move(client), argv.at(0), argv.at(1), argv.at(2), argv.at(3));
}
void RunAll(std::vector<std::string> const& argv) {
namespace examples = ::google::cloud::storage::examples;
namespace gcs = ::google::cloud::storage;
if (!argv.empty()) throw examples::Usage{"auto"};
examples::CheckEnvironmentVariablesAreSet({
"GOOGLE_CLOUD_PROJECT",
"GOOGLE_CLOUD_CPP_STORAGE_TEST_BUCKET_NAME",
});
auto const project_id =
google::cloud::internal::GetEnv("GOOGLE_CLOUD_PROJECT").value();
auto const bucket_name = google::cloud::internal::GetEnv(
"GOOGLE_CLOUD_CPP_STORAGE_TEST_BUCKET_NAME")
.value();
auto generator = google::cloud::internal::DefaultPRNG(std::random_device{}());
auto const object_name =
examples::MakeRandomObjectName(generator, "ob-resumable-upload-");
auto client = gcs::Client();
auto const encrypted_object_name =
examples::MakeRandomObjectName(generator, "enc-obj-");
auto const encrypted_composed_object_name =
examples::MakeRandomObjectName(generator, "composed-enc-obj-");
auto const encrypted_copied_object_name =
examples::MakeRandomObjectName(generator, "copied-enc-obj-");
std::cout << "\nRunning GenerateEncryptionKey() example" << std::endl;
auto const key = GenerateEncryptionKey();
std::cout << "\nRunning WriteEncryptedObject() example" << std::endl;
WriteEncryptedObject(client, {bucket_name, encrypted_object_name, key});
std::cout << "\nRunning ReadEncryptedObject() example [1]" << std::endl;
ReadEncryptedObject(client, {bucket_name, encrypted_object_name, key});
std::cout << "\nRunning ComposeObjectFromEncryptedObjects() example"
<< std::endl;
ComposeObjectFromEncryptedObjects(
client, {bucket_name, encrypted_composed_object_name, key,
encrypted_object_name, encrypted_object_name});
std::cout << "\nRunning ReadEncryptedObject() example [2]" << std::endl;
ReadEncryptedObject(client,
{bucket_name, encrypted_composed_object_name, key});
std::cout << "\nRunning CopyEncryptedObject() example" << std::endl;
CopyEncryptedObject(client, {bucket_name, encrypted_object_name, bucket_name,
encrypted_copied_object_name, key});
std::cout << "\nRunning ReadEncryptedObject() example [3]" << std::endl;
ReadEncryptedObject(client, {bucket_name, encrypted_copied_object_name, key});
std::cout << "\nRunning RotateEncryptionKey() example" << std::endl;
auto const newkey = GenerateEncryptionKey();
RotateEncryptionKey(client,
{bucket_name, encrypted_object_name, key, newkey});
std::cout << "\nCleanup" << std::endl;
(void)client.DeleteObject(bucket_name, encrypted_copied_object_name);
(void)client.DeleteObject(bucket_name, encrypted_composed_object_name);
(void)client.DeleteObject(bucket_name, encrypted_object_name);
}
} // namespace
int main(int argc, char* argv[]) {
namespace examples = ::google::cloud::storage::examples;
auto make_entry = [](std::string const& name,
std::vector<std::string> arg_names,
examples::ClientCommand const& cmd) {
arg_names.insert(arg_names.begin(), {"<bucket-name>", "<object-name>"});
return examples::CreateCommandEntry(name, std::move(arg_names), cmd);
};
examples::Example example({
{"generate-encryption-key", GenerateEncryptionKeyCommand},
make_entry("write-encrypted-object", {"<base64-encoded-aes256-key>"},
WriteEncryptedObject),
make_entry("read-encrypted-object", {"<base64-encoded-aes256-key>"},
ReadEncryptedObject),
make_entry("compose-object-from-encrypted-objects",
{"<base64-encoded-aes256-key>", "<source-object>",
"[source-object...]"},
ComposeObjectFromEncryptedObjects),
examples::CreateCommandEntry(
"copy-encrypted-object",
{"<source-bucket-name>", "<source-object-name>",
"<destination-bucket-name>", "<destination-object-name>",
"<encryption-key-base64>"},
CopyEncryptedObject),
make_entry("rotate-encryption-key",
{"<old-encryption-key>", "<new-encryption-key>"},
RotateEncryptionKey),
{"auto", RunAll},
});
return example.Run(argc, argv);
}