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h2database
提交 3effa5c1 authored 作者: Thomas Mueller's avatar Thomas Mueller
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MVStore: encrypted stores are now supported - unaligned file sizes

上级 abe8ba70
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正在显示 包含 176 行增加 和 70 行删除
h2/src/main/org/h2/store/fs/FilePathCrypt.java
浏览文件 @ 3effa5c1
......@@ -6,6 +6,7 @@
*/
package org.h2.store.fs;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
......@@ -13,7 +14,6 @@ import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.util.Arrays;
import org.h2.message.DbException;
import org.h2.mvstore.DataUtils;
import org.h2.security.AES;
import org.h2.security.BlockCipher;
......@@ -26,7 +26,7 @@ import org.h2.util.StringUtils;
*/
public class FilePathCrypt extends FilePathWrapper {
private static final String SCHEME = "crypt2";
private static final String SCHEME = "crypt";
/**
* Register this file system.
......@@ -39,7 +39,7 @@ public class FilePathCrypt extends FilePathWrapper {
String[] parsed = parse(name);
FileChannel file = FileUtils.open(parsed[1], mode);
byte[] passwordBytes = StringUtils.convertHexToBytes(parsed[0]);
return new FileCrypt2(passwordBytes, file);
return new FileCrypt(name, passwordBytes, file);
}
public String getScheme() {
......@@ -56,24 +56,20 @@ public class FilePathCrypt extends FilePathWrapper {
}
public long size() {
long len = getBase().size();
return Math.max(0, len - FileCrypt2.HEADER_LENGTH);
long size = getBase().size() - FileCrypt.HEADER_LENGTH;
size = Math.max(0, size);
if ((size & FileCrypt.BLOCK_SIZE_MASK) != 0) {
size -= FileCrypt.BLOCK_SIZE;
}
return size;
}
public OutputStream newOutputStream(boolean append) {
try {
public OutputStream newOutputStream(boolean append) throws IOException {
return new FileChannelOutputStream(open("rw"), append);
} catch (IOException e) {
throw DbException.convertIOException(e, name);
}
}
public InputStream newInputStream() {
try {
public InputStream newInputStream() throws IOException {
return new FileChannelInputStream(open("r"));
} catch (IOException e) {
throw DbException.convertIOException(e, name);
}
}
/**
......@@ -84,13 +80,13 @@ public class FilePathCrypt extends FilePathWrapper {
*/
private String[] parse(String fileName) {
if (!fileName.startsWith(getScheme())) {
DbException.throwInternalError(fileName + " doesn't start with " + getScheme());
throw new IllegalArgumentException(fileName + " doesn't start with " + getScheme());
}
fileName = fileName.substring(getScheme().length() + 1);
int idx = fileName.indexOf(':');
String password;
if (idx < 0) {
DbException.throwInternalError(fileName + " doesn't contain encryption algorithm and password");
throw new IllegalArgumentException(fileName + " doesn't contain encryption algorithm and password");
}
password = fileName.substring(0, idx);
fileName = fileName.substring(idx + 1);
......@@ -100,21 +96,24 @@ public class FilePathCrypt extends FilePathWrapper {
/**
* An encrypted file with a read cache.
*/
public static class FileCrypt2 extends FileBase {
public static class FileCrypt extends FileBase {
/**
* The block size.
*/
// TODO use a block size of 2048 and a header size of 4096
static final int BLOCK_SIZE = 4096;
/**
* The block size bit mask.
*/
static final int BLOCK_SIZE_MASK = BLOCK_SIZE - 1;
/**
* The length of the file header. Using a smaller header is possible, but
* would mean reads and writes are not aligned to the block size.
*/
static final int HEADER_LENGTH = BLOCK_SIZE;
// TODO improve the header
private static final byte[] HEADER = "H2crypt\n".getBytes();
private static final int SALT_POS = HEADER.length;
......@@ -133,24 +132,37 @@ public class FilePathCrypt extends FilePathWrapper {
private final XTS xts;
/**
* The current position within the file, from a user perspective.
*/
private long pos;
public FileCrypt2(byte[] passwordBytes, FileChannel base) throws IOException {
// TODO rename 'password' to 'options' (comma separated)
/**
* The current file size, from a user perspective.
*/
private long size;
private final String name;
public FileCrypt(String name, byte[] passwordBytes, FileChannel base) throws IOException {
this.name = name;
this.base = base;
boolean newFile = base.size() < HEADER_LENGTH;
this.size = base.size() - HEADER_LENGTH;
boolean newFile = size < 0;
byte[] salt;
if (newFile) {
byte[] header = Arrays.copyOf(HEADER, BLOCK_SIZE);
salt = MathUtils.secureRandomBytes(SALT_LENGTH);
System.arraycopy(salt, 0, header, SALT_POS, salt.length);
DataUtils.writeFully(base, 0, ByteBuffer.wrap(header));
size = 0;
} else {
salt = new byte[SALT_LENGTH];
DataUtils.readFully(base, SALT_POS, ByteBuffer.wrap(salt));
if ((size & BLOCK_SIZE_MASK) != 0) {
size -= BLOCK_SIZE;
}
}
// TODO support Fog (and maybe Fog2)
// Fog cipher = new Fog();
AES cipher = new AES();
cipher.setKey(SHA256.getPBKDF2(passwordBytes, salt, HASH_ITERATIONS, 16));
xts = new XTS(cipher);
......@@ -179,44 +191,112 @@ public class FilePathCrypt extends FilePathWrapper {
public int read(ByteBuffer dst, long position) throws IOException {
int len = dst.remaining();
if (position % BLOCK_SIZE != 0) {
if (len == 0) {
return 0;
}
len = (int) Math.min(len, size - position);
if (position >= size) {
return -1;
} else if (position < 0) {
throw new IllegalArgumentException("pos: " + position);
}
if (len % BLOCK_SIZE != 0) {
throw new IllegalArgumentException("len: " + len);
if ((position & BLOCK_SIZE_MASK) != 0 ||
(len & BLOCK_SIZE_MASK) != 0) {
// either the position or the len is unaligned:
// read aligned, and then truncate
long p = position / BLOCK_SIZE * BLOCK_SIZE;
int offset = (int) (position - p);
int l = (len + offset + BLOCK_SIZE - 1) / BLOCK_SIZE * BLOCK_SIZE;
ByteBuffer temp = ByteBuffer.allocate(l);
readInternal(temp, p, l);
temp.flip();
temp.limit(offset + len);
temp.position(offset);
dst.put(temp);
return len;
}
readInternal(dst, position, len);
return len;
}
private void readInternal(ByteBuffer dst, long position, int len) throws IOException {
int x = dst.position();
len = base.read(dst, position + HEADER_LENGTH);
readFully(base, position + HEADER_LENGTH, dst);
long block = position / BLOCK_SIZE;
int l = len;
while (l > 0) {
while (len > 0) {
xts.decrypt(block++, BLOCK_SIZE, dst.array(), x);
x += BLOCK_SIZE;
l -= BLOCK_SIZE;
len -= BLOCK_SIZE;
}
return len;
}
private static void readFully(FileChannel file, long pos, ByteBuffer dst) throws IOException {
do {
int len = file.read(dst, pos);
if (len < 0) {
throw new EOFException();
}
pos += len;
} while (dst.remaining() > 0);
}
public int write(ByteBuffer src, long position) throws IOException {
int len = src.remaining();
// TODO support non-block aligned file length / reads / writes
if (position % BLOCK_SIZE != 0) {
throw new IllegalArgumentException("pos: " + position);
if ((position & BLOCK_SIZE_MASK) != 0 ||
(len & BLOCK_SIZE_MASK) != 0) {
// either the position or the len is unaligned:
// read aligned, and then truncate
long p = position / BLOCK_SIZE * BLOCK_SIZE;
int offset = (int) (position - p);
int l = (len + offset + BLOCK_SIZE - 1) / BLOCK_SIZE * BLOCK_SIZE;
ByteBuffer temp = ByteBuffer.allocate(l);
int available = (int) (size - p + BLOCK_SIZE - 1) / BLOCK_SIZE * BLOCK_SIZE;
int readLen = Math.min(l, available);
if (readLen > 0) {
readInternal(temp, p, readLen);
temp.rewind();
}
temp.limit(offset + len);
temp.position(offset);
temp.put(src);
temp.limit(l);
temp.rewind();
writeInternal(temp, p, l);
long p2 = position + len;
size = Math.max(size, p2);
int plus = (int) (size & BLOCK_SIZE_MASK);
if (plus > 0) {
temp = ByteBuffer.allocate(plus);
DataUtils.writeFully(base, p + HEADER_LENGTH + l, temp);
}
return len;
}
if (len % BLOCK_SIZE != 0) {
throw new IllegalArgumentException("len: " + len);
writeInternal(src, position, len);
long p2 = position + len;
size = Math.max(size, p2);
return len;
}
private void writeInternal(ByteBuffer src, long position, int len) throws IOException {
ByteBuffer crypt = ByteBuffer.allocate(len);
crypt.put(src);
crypt.flip();
long block = position / BLOCK_SIZE;
int x = 0;
while (len > 0) {
int x = 0, l = len;
while (l > 0) {
xts.encrypt(block++, BLOCK_SIZE, crypt.array(), x);
x += BLOCK_SIZE;
len -= BLOCK_SIZE;
l -= BLOCK_SIZE;
}
return base.write(crypt, position + BLOCK_SIZE);
writeFully(base, position + HEADER_LENGTH, crypt);
}
private static void writeFully(FileChannel file, long pos, ByteBuffer src) throws IOException {
int off = 0;
do {
int len = file.write(src, pos + off);
off += len;
} while (src.remaining() > 0);
}
public int write(ByteBuffer src) throws IOException {
......@@ -228,14 +308,24 @@ public class FilePathCrypt extends FilePathWrapper {
}
public long size() throws IOException {
return base.size() - HEADER_LENGTH;
return size;
}
public FileChannel truncate(long newSize) throws IOException {
if (newSize % BLOCK_SIZE != 0) {
if (newSize > size) {
return this;
}
if (newSize < 0) {
throw new IllegalArgumentException("newSize: " + newSize);
}
base.truncate(newSize + BLOCK_SIZE);
int offset = (int) (newSize & BLOCK_SIZE_MASK);
if (offset > 0) {
base.truncate(newSize + HEADER_LENGTH + BLOCK_SIZE);
} else {
base.truncate(newSize + HEADER_LENGTH);
}
this.size = newSize;
pos = Math.min(pos, size);
return this;
}
......@@ -248,7 +338,7 @@ public class FilePathCrypt extends FilePathWrapper {
}
public String toString() {
return SCHEME + ":" + base.toString();
return name;
}
}
......@@ -262,7 +352,7 @@ public class FilePathCrypt extends FilePathWrapper {
static class XTS {
/**
* Galois Field feedback.
* Galois field feedback.
*/
private static final int GF_128_FEEDBACK = 0x87;
......@@ -277,6 +367,14 @@ public class FilePathCrypt extends FilePathWrapper {
this.cipher = cipher;
}
/**
* Encrypt the data.
*
* @param id the (sector) id
* @param len the number of bytes
* @param data the data
* @param offset the offset within the data
*/
void encrypt(long id, int len, byte[] data, int offset) {
byte[] tweak = initTweak(id);
int i = 0;
......@@ -297,6 +395,14 @@ public class FilePathCrypt extends FilePathWrapper {
}
}
/**
* Decrypt the data.
*
* @param id the (sector) id
* @param len the number of bytes
* @param data the data
* @param offset the offset within the data
*/
void decrypt(long id, int len, byte[] data, int offset) {
byte[] tweak = initTweak(id), tweakEnd = tweak;
int i = 0;
......@@ -335,7 +441,7 @@ public class FilePathCrypt extends FilePathWrapper {
}
}
static void updateTweak(byte[] tweak) {
private static void updateTweak(byte[] tweak) {
byte ci = 0, co = 0;
for (int i = 0; i < CIPHER_BLOCK_SIZE; i++) {
co = (byte) ((tweak[i] >> 7) & 1);
......@@ -347,7 +453,7 @@ public class FilePathCrypt extends FilePathWrapper {
}
}
static void swap(byte[] data, int source, int target, int len) {
private static void swap(byte[] data, int source, int target, int len) {
for (int i = 0; i < len; i++) {
byte temp = data[source + i];
data[source + i] = data[target + i];
......
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