Summary: This PR adds support for encrypting data stored by RocksDB when written to disk. It adds an `EncryptedEnv` override of the `Env` class with matching overrides for sequential&random access files. The encryption itself is done through a configurable `EncryptionProvider`. This class creates is asked to create `BlockAccessCipherStream` for a file. This is where the actual encryption/decryption is being done. Currently there is a Counter mode implementation of `BlockAccessCipherStream` with a `ROT13` block cipher (NOTE the `ROT13` is for demo purposes only!!). The Counter operation mode uses an initial counter & random initialization vector (IV). Both are created randomly for each file and stored in a 4K (default size) block that is prefixed to that file. The `EncryptedEnv` implementation is such that clients of the `Env` class do not see this prefix (nor data, nor in filesize). The largest part of the prefix block is also encrypted, and there is room left for implementation specific settings/values/keys in there. To test the encryption, the `DBTestBase` class has been extended to consider a new environment variable called `ENCRYPTED_ENV`. If set, the test will setup a encrypted instance of the `Env` class to use for all tests. Typically you would run it like this: ``` ENCRYPTED_ENV=1 make check_some ``` There is also an added test that checks that some data inserted into the database is or is not "visible" on disk. With `ENCRYPTED_ENV` active it must not find plain text strings, with `ENCRYPTED_ENV` unset, it must find the plain text strings. Closes https://github.com/facebook/rocksdb/pull/2424 Differential Revision: D5322178 Pulled By: sdwilsh fbshipit-source-id: 253b0a9c2c498cc98f580df7f2623cbf7678a27fmain
Ewout Prangsma
8 years ago
committed by
Facebook Github Bot
parent
7061912c23
commit
51778612c9
@ -0,0 +1,96 @@ |
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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// This source code is also licensed under the GPLv2 license found in the
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// COPYING file in the root directory of this source tree.
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//
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#include "db/db_test_util.h" |
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#include "port/stack_trace.h" |
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#include "rocksdb/perf_context.h" |
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#if !defined(ROCKSDB_LITE) |
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#include "util/sync_point.h" |
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#endif |
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#include <iostream> |
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#include <string> |
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namespace rocksdb { |
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class DBEncryptionTest : public DBTestBase { |
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public: |
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DBEncryptionTest() : DBTestBase("/db_encryption_test") {} |
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}; |
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#ifndef ROCKSDB_LITE |
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TEST_F(DBEncryptionTest, CheckEncrypted) { |
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ASSERT_OK(Put("foo567", "v1.fetdq")); |
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ASSERT_OK(Put("bar123", "v2.dfgkjdfghsd")); |
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Close(); |
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// Open all files and look for the values we've put in there.
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// They should not be found if encrypted, otherwise
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// they should be found.
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std::vector<std::string> fileNames; |
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auto status = env_->GetChildren(dbname_, &fileNames); |
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ASSERT_OK(status); |
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auto defaultEnv = Env::Default(); |
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int hits = 0; |
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for (auto it = fileNames.begin() ; it != fileNames.end(); ++it) { |
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if ((*it == "..") || (*it == ".")) { |
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continue; |
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} |
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auto filePath = dbname_ + "/" + *it; |
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unique_ptr<SequentialFile> seqFile; |
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auto envOptions = EnvOptions(CurrentOptions()); |
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status = defaultEnv->NewSequentialFile(filePath, &seqFile, envOptions); |
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ASSERT_OK(status); |
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uint64_t fileSize; |
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status = defaultEnv->GetFileSize(filePath, &fileSize); |
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ASSERT_OK(status); |
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std::string scratch; |
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scratch.reserve(fileSize); |
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Slice data; |
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status = seqFile->Read(fileSize, &data, (char*)scratch.data()); |
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ASSERT_OK(status); |
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if (data.ToString().find("foo567") != std::string::npos) { |
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hits++;
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//std::cout << "Hit in " << filePath << "\n";
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} |
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if (data.ToString().find("v1.fetdq") != std::string::npos) { |
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hits++;
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//std::cout << "Hit in " << filePath << "\n";
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} |
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if (data.ToString().find("bar123") != std::string::npos) { |
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hits++;
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//std::cout << "Hit in " << filePath << "\n";
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} |
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if (data.ToString().find("v2.dfgkjdfghsd") != std::string::npos) { |
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hits++;
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//std::cout << "Hit in " << filePath << "\n";
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} |
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if (data.ToString().find("dfgk") != std::string::npos) { |
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hits++;
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//std::cout << "Hit in " << filePath << "\n";
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} |
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} |
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if (encrypted_env_) { |
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ASSERT_EQ(hits, 0); |
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} else { |
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ASSERT_GE(hits, 4); |
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} |
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} |
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#endif // ROCKSDB_LITE
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} // namespace rocksdb
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int main(int argc, char** argv) { |
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rocksdb::port::InstallStackTraceHandler(); |
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::testing::InitGoogleTest(&argc, argv); |
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return RUN_ALL_TESTS(); |
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} |
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@ -0,0 +1,911 @@ |
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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// This source code is also licensed under the GPLv2 license found in the
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// COPYING file in the root directory of this source tree.
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#ifndef ROCKSDB_LITE |
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#include <algorithm> |
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#include <cctype> |
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#include <iostream> |
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#include "rocksdb/env_encryption.h" |
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#include "util/aligned_buffer.h" |
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#include "util/coding.h" |
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#include "util/random.h" |
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#endif |
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namespace rocksdb { |
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#ifndef ROCKSDB_LITE |
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class EncryptedSequentialFile : public SequentialFile { |
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private: |
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std::unique_ptr<SequentialFile> file_; |
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std::unique_ptr<BlockAccessCipherStream> stream_; |
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uint64_t offset_; |
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size_t prefixLength_; |
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public: |
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// Default ctor. Given underlying sequential file is supposed to be at
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// offset == prefixLength.
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EncryptedSequentialFile(SequentialFile* f, BlockAccessCipherStream* s, size_t prefixLength) |
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: file_(f), stream_(s), offset_(prefixLength), prefixLength_(prefixLength) { |
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} |
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// Read up to "n" bytes from the file. "scratch[0..n-1]" may be
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// written by this routine. Sets "*result" to the data that was
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// read (including if fewer than "n" bytes were successfully read).
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// May set "*result" to point at data in "scratch[0..n-1]", so
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// "scratch[0..n-1]" must be live when "*result" is used.
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// If an error was encountered, returns a non-OK status.
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//
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// REQUIRES: External synchronization
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virtual Status Read(size_t n, Slice* result, char* scratch) override { |
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assert(scratch); |
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Status status = file_->Read(n, result, scratch); |
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if (!status.ok()) { |
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return status; |
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} |
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status = stream_->Decrypt(offset_, (char*)result->data(), result->size()); |
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offset_ += result->size(); // We've already ready data from disk, so update offset_ even if decryption fails.
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return status; |
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} |
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// Skip "n" bytes from the file. This is guaranteed to be no
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// slower that reading the same data, but may be faster.
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//
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// If end of file is reached, skipping will stop at the end of the
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// file, and Skip will return OK.
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//
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// REQUIRES: External synchronization
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virtual Status Skip(uint64_t n) override { |
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auto status = file_->Skip(n); |
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if (!status.ok()) { |
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return status; |
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} |
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offset_ += n; |
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return status; |
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} |
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// Indicates the upper layers if the current SequentialFile implementation
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// uses direct IO.
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virtual bool use_direct_io() const override {
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return file_->use_direct_io();
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} |
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// Use the returned alignment value to allocate
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// aligned buffer for Direct I/O
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virtual size_t GetRequiredBufferAlignment() const override {
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return file_->GetRequiredBufferAlignment();
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} |
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// Remove any kind of caching of data from the offset to offset+length
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// of this file. If the length is 0, then it refers to the end of file.
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// If the system is not caching the file contents, then this is a noop.
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virtual Status InvalidateCache(size_t offset, size_t length) override { |
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return file_->InvalidateCache(offset + prefixLength_, length); |
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} |
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// Positioned Read for direct I/O
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// If Direct I/O enabled, offset, n, and scratch should be properly aligned
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virtual Status PositionedRead(uint64_t offset, size_t n, Slice* result, char* scratch) override { |
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assert(scratch); |
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offset += prefixLength_; // Skip prefix
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auto status = file_->PositionedRead(offset, n, result, scratch); |
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if (!status.ok()) { |
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return status; |
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} |
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offset_ = offset + result->size(); |
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status = stream_->Decrypt(offset, (char*)result->data(), result->size()); |
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return status; |
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} |
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}; |
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// A file abstraction for randomly reading the contents of a file.
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class EncryptedRandomAccessFile : public RandomAccessFile { |
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private: |
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std::unique_ptr<RandomAccessFile> file_; |
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std::unique_ptr<BlockAccessCipherStream> stream_; |
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size_t prefixLength_; |
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public: |
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EncryptedRandomAccessFile(RandomAccessFile* f, BlockAccessCipherStream* s, size_t prefixLength) |
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: file_(f), stream_(s), prefixLength_(prefixLength) { } |
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// Read up to "n" bytes from the file starting at "offset".
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// "scratch[0..n-1]" may be written by this routine. Sets "*result"
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// to the data that was read (including if fewer than "n" bytes were
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// successfully read). May set "*result" to point at data in
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// "scratch[0..n-1]", so "scratch[0..n-1]" must be live when
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// "*result" is used. If an error was encountered, returns a non-OK
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// status.
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//
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// Safe for concurrent use by multiple threads.
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// If Direct I/O enabled, offset, n, and scratch should be aligned properly.
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virtual Status Read(uint64_t offset, size_t n, Slice* result, char* scratch) const override { |
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assert(scratch); |
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offset += prefixLength_; |
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auto status = file_->Read(offset, n, result, scratch); |
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if (!status.ok()) { |
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return status; |
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} |
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status = stream_->Decrypt(offset, (char*)result->data(), result->size()); |
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return status; |
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} |
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// Readahead the file starting from offset by n bytes for caching.
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virtual Status Prefetch(uint64_t offset, size_t n) override { |
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//return Status::OK();
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return file_->Prefetch(offset + prefixLength_, n); |
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} |
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// Tries to get an unique ID for this file that will be the same each time
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// the file is opened (and will stay the same while the file is open).
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// Furthermore, it tries to make this ID at most "max_size" bytes. If such an
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// ID can be created this function returns the length of the ID and places it
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// in "id"; otherwise, this function returns 0, in which case "id"
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// may not have been modified.
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//
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// This function guarantees, for IDs from a given environment, two unique ids
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// cannot be made equal to eachother by adding arbitrary bytes to one of
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// them. That is, no unique ID is the prefix of another.
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//
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// This function guarantees that the returned ID will not be interpretable as
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// a single varint.
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//
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// Note: these IDs are only valid for the duration of the process.
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virtual size_t GetUniqueId(char* id, size_t max_size) const override { |
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return file_->GetUniqueId(id, max_size); |
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}; |
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virtual void Hint(AccessPattern pattern) override { |
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file_->Hint(pattern); |
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} |
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// Indicates the upper layers if the current RandomAccessFile implementation
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// uses direct IO.
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virtual bool use_direct_io() const override { |
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return file_->use_direct_io();
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} |
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// Use the returned alignment value to allocate
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// aligned buffer for Direct I/O
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virtual size_t GetRequiredBufferAlignment() const override {
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return file_->GetRequiredBufferAlignment();
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} |
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// Remove any kind of caching of data from the offset to offset+length
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// of this file. If the length is 0, then it refers to the end of file.
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// If the system is not caching the file contents, then this is a noop.
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virtual Status InvalidateCache(size_t offset, size_t length) override { |
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return file_->InvalidateCache(offset + prefixLength_, length); |
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} |
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}; |
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// A file abstraction for sequential writing. The implementation
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// must provide buffering since callers may append small fragments
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// at a time to the file.
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class EncryptedWritableFile : public WritableFileWrapper { |
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private: |
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std::unique_ptr<WritableFile> file_; |
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std::unique_ptr<BlockAccessCipherStream> stream_; |
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size_t prefixLength_; |
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public: |
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// Default ctor. Prefix is assumed to be written already.
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EncryptedWritableFile(WritableFile* f, BlockAccessCipherStream* s, size_t prefixLength) |
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: WritableFileWrapper(f), file_(f), stream_(s), prefixLength_(prefixLength) { } |
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Status Append(const Slice& data) override {
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AlignedBuffer buf; |
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Status status; |
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Slice dataToAppend(data);
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if (data.size() > 0) { |
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auto offset = file_->GetFileSize(); // size including prefix
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// Encrypt in cloned buffer
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buf.Alignment(GetRequiredBufferAlignment()); |
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buf.AllocateNewBuffer(data.size()); |
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memmove(buf.BufferStart(), data.data(), data.size()); |
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status = stream_->Encrypt(offset, buf.BufferStart(), data.size()); |
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if (!status.ok()) { |
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return status; |
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} |
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dataToAppend = Slice(buf.BufferStart(), data.size()); |
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} |
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status = file_->Append(dataToAppend);
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if (!status.ok()) { |
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return status; |
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} |
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return status; |
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} |
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Status PositionedAppend(const Slice& data, uint64_t offset) override { |
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AlignedBuffer buf; |
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Status status; |
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Slice dataToAppend(data);
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offset += prefixLength_; |
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if (data.size() > 0) { |
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// Encrypt in cloned buffer
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buf.Alignment(GetRequiredBufferAlignment()); |
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buf.AllocateNewBuffer(data.size()); |
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memmove(buf.BufferStart(), data.data(), data.size()); |
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status = stream_->Encrypt(offset, buf.BufferStart(), data.size()); |
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if (!status.ok()) { |
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return status; |
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} |
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dataToAppend = Slice(buf.BufferStart(), data.size()); |
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} |
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status = file_->PositionedAppend(dataToAppend, offset); |
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if (!status.ok()) { |
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return status; |
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} |
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return status; |
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} |
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// Indicates the upper layers if the current WritableFile implementation
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// uses direct IO.
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virtual bool use_direct_io() const override { return file_->use_direct_io(); } |
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// Use the returned alignment value to allocate
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// aligned buffer for Direct I/O
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virtual size_t GetRequiredBufferAlignment() const override { return file_->GetRequiredBufferAlignment(); }
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/*
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* Get the size of valid data in the file. |
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*/ |
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virtual uint64_t GetFileSize() override { |
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return file_->GetFileSize() - prefixLength_; |
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} |
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// Truncate is necessary to trim the file to the correct size
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// before closing. It is not always possible to keep track of the file
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// size due to whole pages writes. The behavior is undefined if called
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// with other writes to follow.
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virtual Status Truncate(uint64_t size) override { |
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return file_->Truncate(size + prefixLength_); |
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} |
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// Remove any kind of caching of data from the offset to offset+length
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// of this file. If the length is 0, then it refers to the end of file.
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// If the system is not caching the file contents, then this is a noop.
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// This call has no effect on dirty pages in the cache.
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virtual Status InvalidateCache(size_t offset, size_t length) override { |
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return file_->InvalidateCache(offset + prefixLength_, length); |
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} |
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// Sync a file range with disk.
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// offset is the starting byte of the file range to be synchronized.
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// nbytes specifies the length of the range to be synchronized.
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// This asks the OS to initiate flushing the cached data to disk,
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// without waiting for completion.
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// Default implementation does nothing.
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virtual Status RangeSync(uint64_t offset, uint64_t nbytes) override {
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return file_->RangeSync(offset + prefixLength_, nbytes); |
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} |
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// PrepareWrite performs any necessary preparation for a write
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// before the write actually occurs. This allows for pre-allocation
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// of space on devices where it can result in less file
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// fragmentation and/or less waste from over-zealous filesystem
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// pre-allocation.
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virtual void PrepareWrite(size_t offset, size_t len) override { |
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file_->PrepareWrite(offset + prefixLength_, len); |
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} |
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// Pre-allocates space for a file.
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virtual Status Allocate(uint64_t offset, uint64_t len) override { |
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return file_->Allocate(offset + prefixLength_, len); |
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} |
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}; |
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// A file abstraction for random reading and writing.
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class EncryptedRandomRWFile : public RandomRWFile { |
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private: |
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std::unique_ptr<RandomRWFile> file_; |
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std::unique_ptr<BlockAccessCipherStream> stream_; |
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size_t prefixLength_; |
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public: |
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EncryptedRandomRWFile(RandomRWFile* f, BlockAccessCipherStream* s, size_t prefixLength) |
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: file_(f), stream_(s), prefixLength_(prefixLength) {} |
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// Indicates if the class makes use of direct I/O
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// If false you must pass aligned buffer to Write()
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virtual bool use_direct_io() const override { return file_->use_direct_io(); } |
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// Use the returned alignment value to allocate
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// aligned buffer for Direct I/O
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virtual size_t GetRequiredBufferAlignment() const override {
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return file_->GetRequiredBufferAlignment();
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} |
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// Write bytes in `data` at offset `offset`, Returns Status::OK() on success.
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// Pass aligned buffer when use_direct_io() returns true.
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virtual Status Write(uint64_t offset, const Slice& data) override { |
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AlignedBuffer buf; |
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Status status; |
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Slice dataToWrite(data);
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offset += prefixLength_; |
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if (data.size() > 0) { |
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// Encrypt in cloned buffer
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buf.Alignment(GetRequiredBufferAlignment()); |
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buf.AllocateNewBuffer(data.size()); |
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memmove(buf.BufferStart(), data.data(), data.size()); |
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status = stream_->Encrypt(offset, buf.BufferStart(), data.size()); |
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if (!status.ok()) { |
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return status; |
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} |
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dataToWrite = Slice(buf.BufferStart(), data.size()); |
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} |
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status = file_->Write(offset, dataToWrite); |
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return status; |
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} |
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// Read up to `n` bytes starting from offset `offset` and store them in
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// result, provided `scratch` size should be at least `n`.
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// Returns Status::OK() on success.
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virtual Status Read(uint64_t offset, size_t n, Slice* result, char* scratch) const override {
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assert(scratch); |
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offset += prefixLength_; |
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auto status = file_->Read(offset, n, result, scratch); |
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if (!status.ok()) { |
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return status; |
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} |
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status = stream_->Decrypt(offset, (char*)result->data(), result->size()); |
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return status; |
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} |
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virtual Status Flush() override { |
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return file_->Flush(); |
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} |
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virtual Status Sync() override { |
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return file_->Sync(); |
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} |
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virtual Status Fsync() override {
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return file_->Fsync(); |
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} |
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virtual Status Close() override { |
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return file_->Close(); |
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} |
||||
}; |
||||
|
||||
// EncryptedEnv implements an Env wrapper that adds encryption to files stored on disk.
|
||||
class EncryptedEnv : public EnvWrapper { |
||||
public: |
||||
EncryptedEnv(Env* base_env, EncryptionProvider *provider) |
||||
: EnvWrapper(base_env) { |
||||
provider_ = provider; |
||||
} |
||||
|
||||
// NewSequentialFile opens a file for sequential reading.
|
||||
virtual Status NewSequentialFile(const std::string& fname, |
||||
std::unique_ptr<SequentialFile>* result, |
||||
const EnvOptions& options) override { |
||||
result->reset(); |
||||
if (options.use_mmap_reads) { |
||||
return Status::InvalidArgument(); |
||||
} |
||||
// Open file using underlying Env implementation
|
||||
std::unique_ptr<SequentialFile> underlying; |
||||
auto status = EnvWrapper::NewSequentialFile(fname, &underlying, options); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
// Read prefix (if needed)
|
||||
AlignedBuffer prefixBuf; |
||||
Slice prefixSlice; |
||||
size_t prefixLength = provider_->GetPrefixLength(); |
||||
if (prefixLength > 0) { |
||||
// Read prefix
|
||||
prefixBuf.Alignment(underlying->GetRequiredBufferAlignment()); |
||||
prefixBuf.AllocateNewBuffer(prefixLength); |
||||
status = underlying->Read(prefixLength, &prefixSlice, prefixBuf.BufferStart()); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
} |
||||
// Create cipher stream
|
||||
std::unique_ptr<BlockAccessCipherStream> stream; |
||||
status = provider_->CreateCipherStream(fname, options, prefixSlice, &stream); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
(*result) = std::unique_ptr<SequentialFile>(new EncryptedSequentialFile(underlying.release(), stream.release(), prefixLength)); |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// NewRandomAccessFile opens a file for random read access.
|
||||
virtual Status NewRandomAccessFile(const std::string& fname, |
||||
unique_ptr<RandomAccessFile>* result, |
||||
const EnvOptions& options) override { |
||||
result->reset(); |
||||
if (options.use_mmap_reads) { |
||||
return Status::InvalidArgument(); |
||||
} |
||||
// Open file using underlying Env implementation
|
||||
std::unique_ptr<RandomAccessFile> underlying; |
||||
auto status = EnvWrapper::NewRandomAccessFile(fname, &underlying, options); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
// Read prefix (if needed)
|
||||
AlignedBuffer prefixBuf; |
||||
Slice prefixSlice; |
||||
size_t prefixLength = provider_->GetPrefixLength(); |
||||
if (prefixLength > 0) { |
||||
// Read prefix
|
||||
prefixBuf.Alignment(underlying->GetRequiredBufferAlignment()); |
||||
prefixBuf.AllocateNewBuffer(prefixLength); |
||||
status = underlying->Read(0, prefixLength, &prefixSlice, prefixBuf.BufferStart()); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
} |
||||
// Create cipher stream
|
||||
std::unique_ptr<BlockAccessCipherStream> stream; |
||||
status = provider_->CreateCipherStream(fname, options, prefixSlice, &stream); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
(*result) = std::unique_ptr<RandomAccessFile>(new EncryptedRandomAccessFile(underlying.release(), stream.release(), prefixLength)); |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// NewWritableFile opens a file for sequential writing.
|
||||
virtual Status NewWritableFile(const std::string& fname, |
||||
unique_ptr<WritableFile>* result, |
||||
const EnvOptions& options) override { |
||||
result->reset(); |
||||
if (options.use_mmap_writes) { |
||||
return Status::InvalidArgument(); |
||||
} |
||||
// Open file using underlying Env implementation
|
||||
std::unique_ptr<WritableFile> underlying; |
||||
Status status = EnvWrapper::NewWritableFile(fname, &underlying, options); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
// Initialize & write prefix (if needed)
|
||||
AlignedBuffer prefixBuf; |
||||
Slice prefixSlice; |
||||
size_t prefixLength = provider_->GetPrefixLength(); |
||||
if (prefixLength > 0) { |
||||
// Initialize prefix
|
||||
prefixBuf.Alignment(underlying->GetRequiredBufferAlignment()); |
||||
prefixBuf.AllocateNewBuffer(prefixLength); |
||||
provider_->CreateNewPrefix(fname, prefixBuf.BufferStart(), prefixLength); |
||||
prefixSlice = Slice(prefixBuf.BufferStart(), prefixLength); |
||||
// Write prefix
|
||||
status = underlying->Append(prefixSlice); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
} |
||||
// Create cipher stream
|
||||
std::unique_ptr<BlockAccessCipherStream> stream; |
||||
status = provider_->CreateCipherStream(fname, options, prefixSlice, &stream); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
(*result) = std::unique_ptr<WritableFile>(new EncryptedWritableFile(underlying.release(), stream.release(), prefixLength)); |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// Create an object that writes to a new file with the specified
|
||||
// name. Deletes any existing file with the same name and creates a
|
||||
// new file. On success, stores a pointer to the new file in
|
||||
// *result and returns OK. On failure stores nullptr in *result and
|
||||
// returns non-OK.
|
||||
//
|
||||
// The returned file will only be accessed by one thread at a time.
|
||||
virtual Status ReopenWritableFile(const std::string& fname, |
||||
unique_ptr<WritableFile>* result, |
||||
const EnvOptions& options) override { |
||||
result->reset(); |
||||
if (options.use_mmap_writes) { |
||||
return Status::InvalidArgument(); |
||||
} |
||||
// Open file using underlying Env implementation
|
||||
std::unique_ptr<WritableFile> underlying; |
||||
Status status = EnvWrapper::ReopenWritableFile(fname, &underlying, options); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
// Initialize & write prefix (if needed)
|
||||
AlignedBuffer prefixBuf; |
||||
Slice prefixSlice; |
||||
size_t prefixLength = provider_->GetPrefixLength(); |
||||
if (prefixLength > 0) { |
||||
// Initialize prefix
|
||||
prefixBuf.Alignment(underlying->GetRequiredBufferAlignment()); |
||||
prefixBuf.AllocateNewBuffer(prefixLength); |
||||
provider_->CreateNewPrefix(fname, prefixBuf.BufferStart(), prefixLength); |
||||
prefixSlice = Slice(prefixBuf.BufferStart(), prefixLength); |
||||
// Write prefix
|
||||
status = underlying->Append(prefixSlice); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
} |
||||
// Create cipher stream
|
||||
std::unique_ptr<BlockAccessCipherStream> stream; |
||||
status = provider_->CreateCipherStream(fname, options, prefixSlice, &stream); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
(*result) = std::unique_ptr<WritableFile>(new EncryptedWritableFile(underlying.release(), stream.release(), prefixLength)); |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// Reuse an existing file by renaming it and opening it as writable.
|
||||
virtual Status ReuseWritableFile(const std::string& fname, |
||||
const std::string& old_fname, |
||||
unique_ptr<WritableFile>* result, |
||||
const EnvOptions& options) override { |
||||
result->reset(); |
||||
if (options.use_mmap_writes) { |
||||
return Status::InvalidArgument(); |
||||
} |
||||
// Open file using underlying Env implementation
|
||||
std::unique_ptr<WritableFile> underlying; |
||||
Status status = EnvWrapper::ReuseWritableFile(fname, old_fname, &underlying, options); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
// Initialize & write prefix (if needed)
|
||||
AlignedBuffer prefixBuf; |
||||
Slice prefixSlice; |
||||
size_t prefixLength = provider_->GetPrefixLength(); |
||||
if (prefixLength > 0) { |
||||
// Initialize prefix
|
||||
prefixBuf.Alignment(underlying->GetRequiredBufferAlignment()); |
||||
prefixBuf.AllocateNewBuffer(prefixLength); |
||||
provider_->CreateNewPrefix(fname, prefixBuf.BufferStart(), prefixLength); |
||||
prefixSlice = Slice(prefixBuf.BufferStart(), prefixLength); |
||||
// Write prefix
|
||||
status = underlying->Append(prefixSlice); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
} |
||||
// Create cipher stream
|
||||
std::unique_ptr<BlockAccessCipherStream> stream; |
||||
status = provider_->CreateCipherStream(fname, options, prefixSlice, &stream); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
(*result) = std::unique_ptr<WritableFile>(new EncryptedWritableFile(underlying.release(), stream.release(), prefixLength)); |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// Open `fname` for random read and write, if file dont exist the file
|
||||
// will be created. On success, stores a pointer to the new file in
|
||||
// *result and returns OK. On failure returns non-OK.
|
||||
//
|
||||
// The returned file will only be accessed by one thread at a time.
|
||||
virtual Status NewRandomRWFile(const std::string& fname, |
||||
unique_ptr<RandomRWFile>* result, |
||||
const EnvOptions& options) override { |
||||
result->reset(); |
||||
if (options.use_mmap_reads || options.use_mmap_writes) { |
||||
return Status::InvalidArgument(); |
||||
} |
||||
// Check file exists
|
||||
bool isNewFile = !FileExists(fname).ok(); |
||||
|
||||
// Open file using underlying Env implementation
|
||||
std::unique_ptr<RandomRWFile> underlying; |
||||
Status status = EnvWrapper::NewRandomRWFile(fname, &underlying, options); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
// Read or Initialize & write prefix (if needed)
|
||||
AlignedBuffer prefixBuf; |
||||
Slice prefixSlice; |
||||
size_t prefixLength = provider_->GetPrefixLength(); |
||||
if (prefixLength > 0) { |
||||
prefixBuf.Alignment(underlying->GetRequiredBufferAlignment()); |
||||
prefixBuf.AllocateNewBuffer(prefixLength); |
||||
if (!isNewFile) { |
||||
// File already exists, read prefix
|
||||
status = underlying->Read(0, prefixLength, &prefixSlice, prefixBuf.BufferStart()); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
} else { |
||||
// File is new, initialize & write prefix
|
||||
provider_->CreateNewPrefix(fname, prefixBuf.BufferStart(), prefixLength); |
||||
prefixSlice = Slice(prefixBuf.BufferStart(), prefixLength); |
||||
// Write prefix
|
||||
status = underlying->Write(0, prefixSlice); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
} |
||||
} |
||||
// Create cipher stream
|
||||
std::unique_ptr<BlockAccessCipherStream> stream; |
||||
status = provider_->CreateCipherStream(fname, options, prefixSlice, &stream); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
(*result) = std::unique_ptr<RandomRWFile>(new EncryptedRandomRWFile(underlying.release(), stream.release(), prefixLength)); |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// Store in *result the attributes of the children of the specified directory.
|
||||
// In case the implementation lists the directory prior to iterating the files
|
||||
// and files are concurrently deleted, the deleted files will be omitted from
|
||||
// result.
|
||||
// The name attributes are relative to "dir".
|
||||
// Original contents of *results are dropped.
|
||||
// Returns OK if "dir" exists and "*result" contains its children.
|
||||
// NotFound if "dir" does not exist, the calling process does not have
|
||||
// permission to access "dir", or if "dir" is invalid.
|
||||
// IOError if an IO Error was encountered
|
||||
virtual Status GetChildrenFileAttributes(const std::string& dir, std::vector<FileAttributes>* result) override { |
||||
auto status = EnvWrapper::GetChildrenFileAttributes(dir, result); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
size_t prefixLength = provider_->GetPrefixLength(); |
||||
for (auto it = std::begin(*result); it!=std::end(*result); ++it) { |
||||
assert(it->size_bytes >= prefixLength); |
||||
it->size_bytes -= prefixLength; |
||||
} |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// Store the size of fname in *file_size.
|
||||
virtual Status GetFileSize(const std::string& fname, uint64_t* file_size) override { |
||||
auto status = EnvWrapper::GetFileSize(fname, file_size); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
size_t prefixLength = provider_->GetPrefixLength(); |
||||
assert(*file_size >= prefixLength); |
||||
*file_size -= prefixLength; |
||||
return Status::OK();
|
||||
} |
||||
|
||||
private: |
||||
EncryptionProvider *provider_; |
||||
}; |
||||
|
||||
|
||||
// Returns an Env that encrypts data when stored on disk and decrypts data when
|
||||
// read from disk.
|
||||
Env* NewEncryptedEnv(Env* base_env, EncryptionProvider* provider) { |
||||
return new EncryptedEnv(base_env, provider); |
||||
} |
||||
|
||||
// Encrypt one or more (partial) blocks of data at the file offset.
|
||||
// Length of data is given in dataSize.
|
||||
Status BlockAccessCipherStream::Encrypt(uint64_t fileOffset, char *data, size_t dataSize) { |
||||
// Calculate block index
|
||||
auto blockSize = BlockSize(); |
||||
uint64_t blockIndex = fileOffset / blockSize; |
||||
size_t blockOffset = fileOffset % blockSize; |
||||
unique_ptr<char[]> blockBuffer; |
||||
|
||||
std::string scratch; |
||||
AllocateScratch(scratch); |
||||
|
||||
// Encrypt individual blocks.
|
||||
while (1) { |
||||
char *block = data; |
||||
size_t n = std::min(dataSize, blockSize - blockOffset); |
||||
if (n != blockSize) { |
||||
// We're not encrypting a full block.
|
||||
// Copy data to blockBuffer
|
||||
if (!blockBuffer.get()) { |
||||
// Allocate buffer
|
||||
blockBuffer = unique_ptr<char[]>(new char[blockSize]); |
||||
} |
||||
block = blockBuffer.get(); |
||||
// Copy plain data to block buffer
|
||||
memmove(block + blockOffset, data, n); |
||||
} |
||||
auto status = EncryptBlock(blockIndex, block, (char*)scratch.data()); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
if (block != data) { |
||||
// Copy encrypted data back to `data`.
|
||||
memmove(data, block + blockOffset, n); |
||||
} |
||||
dataSize -= n; |
||||
if (dataSize == 0) { |
||||
return Status::OK(); |
||||
} |
||||
data += n; |
||||
blockOffset = 0; |
||||
blockIndex++; |
||||
} |
||||
} |
||||
|
||||
// Decrypt one or more (partial) blocks of data at the file offset.
|
||||
// Length of data is given in dataSize.
|
||||
Status BlockAccessCipherStream::Decrypt(uint64_t fileOffset, char *data, size_t dataSize) { |
||||
// Calculate block index
|
||||
auto blockSize = BlockSize(); |
||||
uint64_t blockIndex = fileOffset / blockSize; |
||||
size_t blockOffset = fileOffset % blockSize; |
||||
unique_ptr<char[]> blockBuffer; |
||||
|
||||
std::string scratch; |
||||
AllocateScratch(scratch); |
||||
|
||||
// Decrypt individual blocks.
|
||||
while (1) { |
||||
char *block = data; |
||||
size_t n = std::min(dataSize, blockSize - blockOffset); |
||||
if (n != blockSize) { |
||||
// We're not decrypting a full block.
|
||||
// Copy data to blockBuffer
|
||||
if (!blockBuffer.get()) { |
||||
// Allocate buffer
|
||||
blockBuffer = unique_ptr<char[]>(new char[blockSize]); |
||||
} |
||||
block = blockBuffer.get(); |
||||
// Copy encrypted data to block buffer
|
||||
memmove(block + blockOffset, data, n); |
||||
} |
||||
auto status = DecryptBlock(blockIndex, block, (char*)scratch.data()); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
if (block != data) { |
||||
// Copy decrypted data back to `data`.
|
||||
memmove(data, block + blockOffset, n); |
||||
} |
||||
dataSize -= n; |
||||
if (dataSize == 0) { |
||||
return Status::OK(); |
||||
} |
||||
data += n; |
||||
blockOffset = 0; |
||||
blockIndex++; |
||||
} |
||||
} |
||||
|
||||
// Encrypt a block of data.
|
||||
// Length of data is equal to BlockSize().
|
||||
Status ROT13BlockCipher::Encrypt(char *data) { |
||||
for (size_t i = 0; i < blockSize_; ++i) { |
||||
data[i] += 13; |
||||
} |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// Decrypt a block of data.
|
||||
// Length of data is equal to BlockSize().
|
||||
Status ROT13BlockCipher::Decrypt(char *data) { |
||||
return Encrypt(data); |
||||
} |
||||
|
||||
// Allocate scratch space which is passed to EncryptBlock/DecryptBlock.
|
||||
void CTRCipherStream::AllocateScratch(std::string& scratch) { |
||||
auto blockSize = cipher_.BlockSize(); |
||||
scratch.reserve(blockSize); |
||||
} |
||||
|
||||
// Encrypt a block of data at the given block index.
|
||||
// Length of data is equal to BlockSize();
|
||||
Status CTRCipherStream::EncryptBlock(uint64_t blockIndex, char *data, char* scratch) { |
||||
|
||||
// Create nonce + counter
|
||||
auto blockSize = cipher_.BlockSize(); |
||||
memmove(scratch, iv_.data(), blockSize); |
||||
EncodeFixed64(scratch, blockIndex + initialCounter_); |
||||
|
||||
// Encrypt nonce+counter
|
||||
auto status = cipher_.Encrypt(scratch); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
|
||||
// XOR data with ciphertext.
|
||||
for (size_t i = 0; i < blockSize; i++) { |
||||
data[i] = data[i] ^ scratch[i]; |
||||
} |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// Decrypt a block of data at the given block index.
|
||||
// Length of data is equal to BlockSize();
|
||||
Status CTRCipherStream::DecryptBlock(uint64_t blockIndex, char *data, char* scratch) { |
||||
// For CTR decryption & encryption are the same
|
||||
return EncryptBlock(blockIndex, data, scratch); |
||||
} |
||||
|
||||
// GetPrefixLength returns the length of the prefix that is added to every file
|
||||
// and used for storing encryption options.
|
||||
// For optimal performance, the prefix length should be a multiple of
|
||||
// the a page size.
|
||||
size_t CTREncryptionProvider::GetPrefixLength() { |
||||
return defaultPrefixLength; |
||||
} |
||||
|
||||
// decodeCTRParameters decodes the initial counter & IV from the given
|
||||
// (plain text) prefix.
|
||||
static void decodeCTRParameters(const char *prefix, size_t blockSize, uint64_t &initialCounter, Slice &iv) { |
||||
// First block contains 64-bit initial counter
|
||||
initialCounter = DecodeFixed64(prefix); |
||||
// Second block contains IV
|
||||
iv = Slice(prefix + blockSize, blockSize); |
||||
} |
||||
|
||||
// CreateNewPrefix initialized an allocated block of prefix memory
|
||||
// for a new file.
|
||||
Status CTREncryptionProvider::CreateNewPrefix(const std::string& fname, char *prefix, size_t prefixLength) { |
||||
// Create & seed rnd.
|
||||
Random rnd((uint32_t)Env::Default()->NowMicros()); |
||||
// Fill entire prefix block with random values.
|
||||
for (size_t i = 0; i < prefixLength; i++) { |
||||
prefix[i] = rnd.Uniform(256) & 0xFF; |
||||
} |
||||
// Take random data to extract initial counter & IV
|
||||
auto blockSize = cipher_.BlockSize(); |
||||
uint64_t initialCounter; |
||||
Slice prefixIV; |
||||
decodeCTRParameters(prefix, blockSize, initialCounter, prefixIV); |
||||
|
||||
// Now populate the rest of the prefix, starting from the third block.
|
||||
PopulateSecretPrefixPart(prefix + (2 * blockSize), prefixLength - (2 * blockSize), blockSize); |
||||
|
||||
// Encrypt the prefix, starting from block 2 (leave block 0, 1 with initial counter & IV unencrypted)
|
||||
CTRCipherStream cipherStream(cipher_, prefixIV.data(), initialCounter); |
||||
auto status = cipherStream.Encrypt(0, prefix + (2 * blockSize), prefixLength - (2 * blockSize)); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// PopulateSecretPrefixPart initializes the data into a new prefix block
|
||||
// in plain text.
|
||||
// Returns the amount of space (starting from the start of the prefix)
|
||||
// that has been initialized.
|
||||
size_t CTREncryptionProvider::PopulateSecretPrefixPart(char *prefix, size_t prefixLength, size_t blockSize) { |
||||
// Nothing to do here, put in custom data in override when needed.
|
||||
return 0; |
||||
} |
||||
|
||||
Status CTREncryptionProvider::CreateCipherStream(const std::string& fname, const EnvOptions& options, Slice &prefix, unique_ptr<BlockAccessCipherStream>* result) { |
||||
// Read plain text part of prefix.
|
||||
auto blockSize = cipher_.BlockSize(); |
||||
uint64_t initialCounter; |
||||
Slice iv; |
||||
decodeCTRParameters(prefix.data(), blockSize, initialCounter, iv); |
||||
|
||||
// Decrypt the encrypted part of the prefix, starting from block 2 (block 0, 1 with initial counter & IV are unencrypted)
|
||||
CTRCipherStream cipherStream(cipher_, iv.data(), initialCounter); |
||||
auto status = cipherStream.Decrypt(0, (char*)prefix.data() + (2 * blockSize), prefix.size() - (2 * blockSize)); |
||||
if (!status.ok()) { |
||||
return status; |
||||
} |
||||
|
||||
// Create cipher stream
|
||||
return CreateCipherStreamFromPrefix(fname, options, initialCounter, iv, prefix, result); |
||||
} |
||||
|
||||
// CreateCipherStreamFromPrefix creates a block access cipher stream for a file given
|
||||
// given name and options. The given prefix is already decrypted.
|
||||
Status CTREncryptionProvider::CreateCipherStreamFromPrefix(const std::string& fname, const EnvOptions& options, |
||||
uint64_t initialCounter, const Slice& iv, const Slice& prefix, unique_ptr<BlockAccessCipherStream>* result) { |
||||
(*result) = unique_ptr<BlockAccessCipherStream>(new CTRCipherStream(cipher_, iv.data(), initialCounter)); |
||||
return Status::OK(); |
||||
} |
||||
|
||||
#endif // ROCKSDB_LITE
|
||||
|
||||
} // namespace rocksdb
|
||||
@ -0,0 +1,198 @@ |
||||
// Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
|
||||
// This source code is licensed under the BSD-style license found in the
|
||||
// LICENSE file in the root directory of this source tree. An additional grant
|
||||
// of patent rights can be found in the PATENTS file in the same directory.
|
||||
// This source code is also licensed under the GPLv2 license found in the
|
||||
// COPYING file in the root directory of this source tree.
|
||||
|
||||
#pragma once |
||||
|
||||
#if !defined(ROCKSDB_LITE) |
||||
|
||||
#include <string> |
||||
|
||||
#include "env.h" |
||||
|
||||
namespace rocksdb { |
||||
|
||||
class EncryptionProvider; |
||||
|
||||
// Returns an Env that encrypts data when stored on disk and decrypts data when
|
||||
// read from disk.
|
||||
Env* NewEncryptedEnv(Env* base_env, EncryptionProvider* provider); |
||||
|
||||
// BlockAccessCipherStream is the base class for any cipher stream that
|
||||
// supports random access at block level (without requiring data from other blocks).
|
||||
// E.g. CTR (Counter operation mode) supports this requirement.
|
||||
class BlockAccessCipherStream { |
||||
public: |
||||
virtual ~BlockAccessCipherStream() {}; |
||||
|
||||
// BlockSize returns the size of each block supported by this cipher stream.
|
||||
virtual size_t BlockSize() = 0; |
||||
|
||||
// Encrypt one or more (partial) blocks of data at the file offset.
|
||||
// Length of data is given in dataSize.
|
||||
virtual Status Encrypt(uint64_t fileOffset, char *data, size_t dataSize); |
||||
|
||||
// Decrypt one or more (partial) blocks of data at the file offset.
|
||||
// Length of data is given in dataSize.
|
||||
virtual Status Decrypt(uint64_t fileOffset, char *data, size_t dataSize); |
||||
|
||||
protected: |
||||
// Allocate scratch space which is passed to EncryptBlock/DecryptBlock.
|
||||
virtual void AllocateScratch(std::string&) = 0; |
||||
|
||||
// Encrypt a block of data at the given block index.
|
||||
// Length of data is equal to BlockSize();
|
||||
virtual Status EncryptBlock(uint64_t blockIndex, char *data, char* scratch) = 0; |
||||
|
||||
// Decrypt a block of data at the given block index.
|
||||
// Length of data is equal to BlockSize();
|
||||
virtual Status DecryptBlock(uint64_t blockIndex, char *data, char* scratch) = 0; |
||||
}; |
||||
|
||||
// BlockCipher
|
||||
class BlockCipher { |
||||
public: |
||||
virtual ~BlockCipher() {}; |
||||
|
||||
// BlockSize returns the size of each block supported by this cipher stream.
|
||||
virtual size_t BlockSize() = 0; |
||||
|
||||
// Encrypt a block of data.
|
||||
// Length of data is equal to BlockSize().
|
||||
virtual Status Encrypt(char *data) = 0; |
||||
|
||||
// Decrypt a block of data.
|
||||
// Length of data is equal to BlockSize().
|
||||
virtual Status Decrypt(char *data) = 0; |
||||
}; |
||||
|
||||
// Implements a BlockCipher using ROT13.
|
||||
//
|
||||
// Note: This is a sample implementation of BlockCipher,
|
||||
// it is NOT considered safe and should NOT be used in production.
|
||||
class ROT13BlockCipher : public BlockCipher { |
||||
private:
|
||||
size_t blockSize_; |
||||
public: |
||||
ROT13BlockCipher(size_t blockSize)
|
||||
: blockSize_(blockSize) {} |
||||
virtual ~ROT13BlockCipher() {}; |
||||
|
||||
// BlockSize returns the size of each block supported by this cipher stream.
|
||||
virtual size_t BlockSize() override { return blockSize_; } |
||||
|
||||
// Encrypt a block of data.
|
||||
// Length of data is equal to BlockSize().
|
||||
virtual Status Encrypt(char *data) override; |
||||
|
||||
// Decrypt a block of data.
|
||||
// Length of data is equal to BlockSize().
|
||||
virtual Status Decrypt(char *data) override; |
||||
}; |
||||
|
||||
// CTRCipherStream implements BlockAccessCipherStream using an
|
||||
// Counter operations mode.
|
||||
// See https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation
|
||||
//
|
||||
// Note: This is a possible implementation of BlockAccessCipherStream,
|
||||
// it is considered suitable for use.
|
||||
class CTRCipherStream final : public BlockAccessCipherStream { |
||||
private: |
||||
BlockCipher& cipher_; |
||||
std::string iv_; |
||||
uint64_t initialCounter_; |
||||
public: |
||||
CTRCipherStream(BlockCipher& c, const char *iv, uint64_t initialCounter)
|
||||
: cipher_(c), iv_(iv, c.BlockSize()), initialCounter_(initialCounter) {}; |
||||
virtual ~CTRCipherStream() {}; |
||||
|
||||
// BlockSize returns the size of each block supported by this cipher stream.
|
||||
virtual size_t BlockSize() override { return cipher_.BlockSize(); } |
||||
|
||||
protected: |
||||
// Allocate scratch space which is passed to EncryptBlock/DecryptBlock.
|
||||
virtual void AllocateScratch(std::string&) override; |
||||
|
||||
// Encrypt a block of data at the given block index.
|
||||
// Length of data is equal to BlockSize();
|
||||
virtual Status EncryptBlock(uint64_t blockIndex, char *data, char *scratch) override; |
||||
|
||||
// Decrypt a block of data at the given block index.
|
||||
// Length of data is equal to BlockSize();
|
||||
virtual Status DecryptBlock(uint64_t blockIndex, char *data, char *scratch) override; |
||||
}; |
||||
|
||||
// The encryption provider is used to create a cipher stream for a specific file.
|
||||
// The returned cipher stream will be used for actual encryption/decryption
|
||||
// actions.
|
||||
class EncryptionProvider { |
||||
public: |
||||
virtual ~EncryptionProvider() {}; |
||||
|
||||
// GetPrefixLength returns the length of the prefix that is added to every file
|
||||
// and used for storing encryption options.
|
||||
// For optimal performance, the prefix length should be a multiple of
|
||||
// the a page size.
|
||||
virtual size_t GetPrefixLength() = 0; |
||||
|
||||
// CreateNewPrefix initialized an allocated block of prefix memory
|
||||
// for a new file.
|
||||
virtual Status CreateNewPrefix(const std::string& fname, char *prefix, size_t prefixLength) = 0; |
||||
|
||||
// CreateCipherStream creates a block access cipher stream for a file given
|
||||
// given name and options.
|
||||
virtual Status CreateCipherStream(const std::string& fname, const EnvOptions& options, |
||||
Slice& prefix, unique_ptr<BlockAccessCipherStream>* result) = 0; |
||||
}; |
||||
|
||||
// This encryption provider uses a CTR cipher stream, with a given block cipher
|
||||
// and IV.
|
||||
//
|
||||
// Note: This is a possible implementation of EncryptionProvider,
|
||||
// it is considered suitable for use, provided a safe BlockCipher is used.
|
||||
class CTREncryptionProvider : public EncryptionProvider { |
||||
private: |
||||
BlockCipher& cipher_; |
||||
protected: |
||||
const static size_t defaultPrefixLength = 4096; |
||||
|
||||
public: |
||||
CTREncryptionProvider(BlockCipher& c)
|
||||
: cipher_(c) {}; |
||||
virtual ~CTREncryptionProvider() {} |
||||
|
||||
// GetPrefixLength returns the length of the prefix that is added to every file
|
||||
// and used for storing encryption options.
|
||||
// For optimal performance, the prefix length should be a multiple of
|
||||
// the a page size.
|
||||
virtual size_t GetPrefixLength() override; |
||||
|
||||
// CreateNewPrefix initialized an allocated block of prefix memory
|
||||
// for a new file.
|
||||
virtual Status CreateNewPrefix(const std::string& fname, char *prefix, size_t prefixLength) override; |
||||
|
||||
// CreateCipherStream creates a block access cipher stream for a file given
|
||||
// given name and options.
|
||||
virtual Status CreateCipherStream(const std::string& fname, const EnvOptions& options, |
||||
Slice& prefix, unique_ptr<BlockAccessCipherStream>* result) override; |
||||
|
||||
protected: |
||||
// PopulateSecretPrefixPart initializes the data into a new prefix block
|
||||
// that will be encrypted. This function will store the data in plain text.
|
||||
// It will be encrypted later (before written to disk).
|
||||
// Returns the amount of space (starting from the start of the prefix)
|
||||
// that has been initialized.
|
||||
virtual size_t PopulateSecretPrefixPart(char *prefix, size_t prefixLength, size_t blockSize); |
||||
|
||||
// CreateCipherStreamFromPrefix creates a block access cipher stream for a file given
|
||||
// given name and options. The given prefix is already decrypted.
|
||||
virtual Status CreateCipherStreamFromPrefix(const std::string& fname, const EnvOptions& options, |
||||
uint64_t initialCounter, const Slice& iv, const Slice& prefix, unique_ptr<BlockAccessCipherStream>* result); |
||||
}; |
||||
|
||||
} // namespace rocksdb
|
||||
|
||||
#endif // !defined(ROCKSDB_LITE)
|
||||
Loading…
Reference in new issue