910 lines
33 KiB
C++
910 lines
33 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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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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}
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};
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// EncryptedEnv implements an Env wrapper that adds encryption to files stored on disk.
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class EncryptedEnv : public EnvWrapper {
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public:
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EncryptedEnv(Env* base_env, EncryptionProvider *provider)
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: EnvWrapper(base_env) {
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provider_ = provider;
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}
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// NewSequentialFile opens a file for sequential reading.
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virtual Status NewSequentialFile(const std::string& fname,
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std::unique_ptr<SequentialFile>* result,
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const EnvOptions& options) override {
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result->reset();
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if (options.use_mmap_reads) {
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return Status::InvalidArgument();
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}
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// Open file using underlying Env implementation
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std::unique_ptr<SequentialFile> underlying;
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auto status = EnvWrapper::NewSequentialFile(fname, &underlying, options);
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if (!status.ok()) {
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return status;
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}
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// Read prefix (if needed)
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AlignedBuffer prefixBuf;
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Slice prefixSlice;
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size_t prefixLength = provider_->GetPrefixLength();
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if (prefixLength > 0) {
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// Read prefix
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prefixBuf.Alignment(underlying->GetRequiredBufferAlignment());
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prefixBuf.AllocateNewBuffer(prefixLength);
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status = underlying->Read(prefixLength, &prefixSlice, prefixBuf.BufferStart());
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if (!status.ok()) {
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return status;
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}
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}
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// Create cipher stream
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std::unique_ptr<BlockAccessCipherStream> stream;
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status = provider_->CreateCipherStream(fname, options, prefixSlice, &stream);
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if (!status.ok()) {
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return status;
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}
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(*result) = std::unique_ptr<SequentialFile>(new EncryptedSequentialFile(underlying.release(), stream.release(), prefixLength));
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return Status::OK();
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}
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// NewRandomAccessFile opens a file for random read access.
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virtual Status NewRandomAccessFile(const std::string& fname,
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unique_ptr<RandomAccessFile>* result,
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const EnvOptions& options) override {
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result->reset();
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if (options.use_mmap_reads) {
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return Status::InvalidArgument();
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}
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// Open file using underlying Env implementation
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std::unique_ptr<RandomAccessFile> underlying;
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auto status = EnvWrapper::NewRandomAccessFile(fname, &underlying, options);
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if (!status.ok()) {
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return status;
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}
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// Read prefix (if needed)
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AlignedBuffer prefixBuf;
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Slice prefixSlice;
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size_t prefixLength = provider_->GetPrefixLength();
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if (prefixLength > 0) {
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// Read prefix
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prefixBuf.Alignment(underlying->GetRequiredBufferAlignment());
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prefixBuf.AllocateNewBuffer(prefixLength);
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status = underlying->Read(0, prefixLength, &prefixSlice, prefixBuf.BufferStart());
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if (!status.ok()) {
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return status;
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}
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}
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// Create cipher stream
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std::unique_ptr<BlockAccessCipherStream> stream;
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status = provider_->CreateCipherStream(fname, options, prefixSlice, &stream);
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if (!status.ok()) {
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return status;
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}
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(*result) = std::unique_ptr<RandomAccessFile>(new EncryptedRandomAccessFile(underlying.release(), stream.release(), prefixLength));
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return Status::OK();
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}
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// NewWritableFile opens a file for sequential writing.
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virtual Status NewWritableFile(const std::string& fname,
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unique_ptr<WritableFile>* result,
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const EnvOptions& options) override {
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result->reset();
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if (options.use_mmap_writes) {
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return Status::InvalidArgument();
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}
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// Open file using underlying Env implementation
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std::unique_ptr<WritableFile> underlying;
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Status status = EnvWrapper::NewWritableFile(fname, &underlying, options);
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if (!status.ok()) {
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return status;
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}
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// Initialize & write prefix (if needed)
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AlignedBuffer prefixBuf;
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Slice prefixSlice;
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size_t prefixLength = provider_->GetPrefixLength();
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if (prefixLength > 0) {
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// Initialize prefix
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prefixBuf.Alignment(underlying->GetRequiredBufferAlignment());
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prefixBuf.AllocateNewBuffer(prefixLength);
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provider_->CreateNewPrefix(fname, prefixBuf.BufferStart(), prefixLength);
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prefixSlice = Slice(prefixBuf.BufferStart(), prefixLength);
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// Write prefix
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status = underlying->Append(prefixSlice);
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if (!status.ok()) {
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return status;
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}
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}
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// Create cipher stream
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std::unique_ptr<BlockAccessCipherStream> stream;
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status = provider_->CreateCipherStream(fname, options, prefixSlice, &stream);
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if (!status.ok()) {
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return status;
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}
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(*result) = std::unique_ptr<WritableFile>(new EncryptedWritableFile(underlying.release(), stream.release(), prefixLength));
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return Status::OK();
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}
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// Create an object that writes to a new file with the specified
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// name. Deletes any existing file with the same name and creates a
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// 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
|