Java example source code file (SSLStreams.java)
The SSLStreams.java Java example source code
/*
* Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.net.httpserver;
import java.net.*;
import java.nio.*;
import java.io.*;
import java.nio.channels.*;
import java.util.concurrent.locks.*;
import javax.net.ssl.*;
import javax.net.ssl.SSLEngineResult.*;
import com.sun.net.httpserver.*;
/**
* given a non-blocking SocketChannel, it produces
* (blocking) streams which encrypt/decrypt the SSL content
* and handle the SSL handshaking automatically.
*/
class SSLStreams {
SSLContext sslctx;
SocketChannel chan;
TimeSource time;
ServerImpl server;
SSLEngine engine;
EngineWrapper wrapper;
OutputStream os;
InputStream is;
/* held by thread doing the hand-shake on this connection */
Lock handshaking = new ReentrantLock();
SSLStreams (ServerImpl server, SSLContext sslctx, SocketChannel chan) throws IOException {
this.server = server;
this.time= (TimeSource)server;
this.sslctx= sslctx;
this.chan= chan;
InetSocketAddress addr =
(InetSocketAddress)chan.socket().getRemoteSocketAddress();
engine = sslctx.createSSLEngine (addr.getHostName(), addr.getPort());
engine.setUseClientMode (false);
HttpsConfigurator cfg = server.getHttpsConfigurator();
configureEngine (cfg, addr);
wrapper = new EngineWrapper (chan, engine);
}
private void configureEngine(HttpsConfigurator cfg, InetSocketAddress addr){
if (cfg != null) {
Parameters params = new Parameters (cfg, addr);
//BEGIN_TIGER_EXCLUDE
cfg.configure (params);
SSLParameters sslParams = params.getSSLParameters();
if (sslParams != null) {
engine.setSSLParameters (sslParams);
} else
//END_TIGER_EXCLUDE
{
/* tiger compatibility */
if (params.getCipherSuites() != null) {
try {
engine.setEnabledCipherSuites (
params.getCipherSuites()
);
} catch (IllegalArgumentException e) { /* LOG */}
}
engine.setNeedClientAuth (params.getNeedClientAuth());
engine.setWantClientAuth (params.getWantClientAuth());
if (params.getProtocols() != null) {
try {
engine.setEnabledProtocols (
params.getProtocols()
);
} catch (IllegalArgumentException e) { /* LOG */}
}
}
}
}
class Parameters extends HttpsParameters {
InetSocketAddress addr;
HttpsConfigurator cfg;
Parameters (HttpsConfigurator cfg, InetSocketAddress addr) {
this.addr = addr;
this.cfg = cfg;
}
public InetSocketAddress getClientAddress () {
return addr;
}
public HttpsConfigurator getHttpsConfigurator() {
return cfg;
}
//BEGIN_TIGER_EXCLUDE
SSLParameters params;
public void setSSLParameters (SSLParameters p) {
params = p;
}
SSLParameters getSSLParameters () {
return params;
}
//END_TIGER_EXCLUDE
}
/**
* cleanup resources allocated inside this object
*/
void close () throws IOException {
wrapper.close();
}
/**
* return the SSL InputStream
*/
InputStream getInputStream () throws IOException {
if (is == null) {
is = new InputStream();
}
return is;
}
/**
* return the SSL OutputStream
*/
OutputStream getOutputStream () throws IOException {
if (os == null) {
os = new OutputStream();
}
return os;
}
SSLEngine getSSLEngine () {
return engine;
}
/**
* request the engine to repeat the handshake on this session
* the handshake must be driven by reads/writes on the streams
* Normally, not necessary to call this.
*/
void beginHandshake() throws SSLException {
engine.beginHandshake();
}
class WrapperResult {
SSLEngineResult result;
/* if passed in buffer was not big enough then the
* a reallocated buffer is returned here
*/
ByteBuffer buf;
}
int app_buf_size;
int packet_buf_size;
enum BufType {
PACKET, APPLICATION
};
private ByteBuffer allocate (BufType type) {
return allocate (type, -1);
}
private ByteBuffer allocate (BufType type, int len) {
assert engine != null;
synchronized (this) {
int size;
if (type == BufType.PACKET) {
if (packet_buf_size == 0) {
SSLSession sess = engine.getSession();
packet_buf_size = sess.getPacketBufferSize();
}
if (len > packet_buf_size) {
packet_buf_size = len;
}
size = packet_buf_size;
} else {
if (app_buf_size == 0) {
SSLSession sess = engine.getSession();
app_buf_size = sess.getApplicationBufferSize();
}
if (len > app_buf_size) {
app_buf_size = len;
}
size = app_buf_size;
}
return ByteBuffer.allocate (size);
}
}
/* reallocates the buffer by :-
* 1. creating a new buffer double the size of the old one
* 2. putting the contents of the old buffer into the new one
* 3. set xx_buf_size to the new size if it was smaller than new size
*
* flip is set to true if the old buffer needs to be flipped
* before it is copied.
*/
private ByteBuffer realloc (ByteBuffer b, boolean flip, BufType type) {
synchronized (this) {
int nsize = 2 * b.capacity();
ByteBuffer n = allocate (type, nsize);
if (flip) {
b.flip();
}
n.put(b);
b = n;
}
return b;
}
/**
* This is a thin wrapper over SSLEngine and the SocketChannel,
* which guarantees the ordering of wraps/unwraps with respect to the underlying
* channel read/writes. It handles the UNDER/OVERFLOW status codes
* It does not handle the handshaking status codes, or the CLOSED status code
* though once the engine is closed, any attempt to read/write to it
* will get an exception. The overall result is returned.
* It functions synchronously/blocking
*/
class EngineWrapper {
SocketChannel chan;
SSLEngine engine;
Object wrapLock, unwrapLock;
ByteBuffer unwrap_src, wrap_dst;
boolean closed = false;
int u_remaining; // the number of bytes left in unwrap_src after an unwrap()
EngineWrapper (SocketChannel chan, SSLEngine engine) throws IOException {
this.chan = chan;
this.engine = engine;
wrapLock = new Object();
unwrapLock = new Object();
unwrap_src = allocate(BufType.PACKET);
wrap_dst = allocate(BufType.PACKET);
}
void close () throws IOException {
}
/* try to wrap and send the data in src. Handles OVERFLOW.
* Might block if there is an outbound blockage or if another
* thread is calling wrap(). Also, might not send any data
* if an unwrap is needed.
*/
WrapperResult wrapAndSend(ByteBuffer src) throws IOException {
return wrapAndSendX(src, false);
}
WrapperResult wrapAndSendX(ByteBuffer src, boolean ignoreClose) throws IOException {
if (closed && !ignoreClose) {
throw new IOException ("Engine is closed");
}
Status status;
WrapperResult r = new WrapperResult();
synchronized (wrapLock) {
wrap_dst.clear();
do {
r.result = engine.wrap (src, wrap_dst);
status = r.result.getStatus();
if (status == Status.BUFFER_OVERFLOW) {
wrap_dst = realloc (wrap_dst, true, BufType.PACKET);
}
} while (status == Status.BUFFER_OVERFLOW);
if (status == Status.CLOSED && !ignoreClose) {
closed = true;
return r;
}
if (r.result.bytesProduced() > 0) {
wrap_dst.flip();
int l = wrap_dst.remaining();
assert l == r.result.bytesProduced();
while (l>0) {
l -= chan.write (wrap_dst);
}
}
}
return r;
}
/* block until a complete message is available and return it
* in dst, together with the Result. dst may have been re-allocated
* so caller should check the returned value in Result
* If handshaking is in progress then, possibly no data is returned
*/
WrapperResult recvAndUnwrap(ByteBuffer dst) throws IOException {
Status status = Status.OK;
WrapperResult r = new WrapperResult();
r.buf = dst;
if (closed) {
throw new IOException ("Engine is closed");
}
boolean needData;
if (u_remaining > 0) {
unwrap_src.compact();
unwrap_src.flip();
needData = false;
} else {
unwrap_src.clear();
needData = true;
}
synchronized (unwrapLock) {
int x;
do {
if (needData) {
do {
x = chan.read (unwrap_src);
} while (x == 0);
if (x == -1) {
throw new IOException ("connection closed for reading");
}
unwrap_src.flip();
}
r.result = engine.unwrap (unwrap_src, r.buf);
status = r.result.getStatus();
if (status == Status.BUFFER_UNDERFLOW) {
if (unwrap_src.limit() == unwrap_src.capacity()) {
/* buffer not big enough */
unwrap_src = realloc (
unwrap_src, false, BufType.PACKET
);
} else {
/* Buffer not full, just need to read more
* data off the channel. Reset pointers
* for reading off SocketChannel
*/
unwrap_src.position (unwrap_src.limit());
unwrap_src.limit (unwrap_src.capacity());
}
needData = true;
} else if (status == Status.BUFFER_OVERFLOW) {
r.buf = realloc (r.buf, true, BufType.APPLICATION);
needData = false;
} else if (status == Status.CLOSED) {
closed = true;
r.buf.flip();
return r;
}
} while (status != Status.OK);
}
u_remaining = unwrap_src.remaining();
return r;
}
}
/**
* send the data in the given ByteBuffer. If a handshake is needed
* then this is handled within this method. When this call returns,
* all of the given user data has been sent and any handshake has been
* completed. Caller should check if engine has been closed.
*/
public WrapperResult sendData (ByteBuffer src) throws IOException {
WrapperResult r=null;
while (src.remaining() > 0) {
r = wrapper.wrapAndSend(src);
Status status = r.result.getStatus();
if (status == Status.CLOSED) {
doClosure ();
return r;
}
HandshakeStatus hs_status = r.result.getHandshakeStatus();
if (hs_status != HandshakeStatus.FINISHED &&
hs_status != HandshakeStatus.NOT_HANDSHAKING)
{
doHandshake(hs_status);
}
}
return r;
}
/**
* read data thru the engine into the given ByteBuffer. If the
* given buffer was not large enough, a new one is allocated
* and returned. This call handles handshaking automatically.
* Caller should check if engine has been closed.
*/
public WrapperResult recvData (ByteBuffer dst) throws IOException {
/* we wait until some user data arrives */
WrapperResult r = null;
assert dst.position() == 0;
while (dst.position() == 0) {
r = wrapper.recvAndUnwrap (dst);
dst = (r.buf != dst) ? r.buf: dst;
Status status = r.result.getStatus();
if (status == Status.CLOSED) {
doClosure ();
return r;
}
HandshakeStatus hs_status = r.result.getHandshakeStatus();
if (hs_status != HandshakeStatus.FINISHED &&
hs_status != HandshakeStatus.NOT_HANDSHAKING)
{
doHandshake (hs_status);
}
}
dst.flip();
return r;
}
/* we've received a close notify. Need to call wrap to send
* the response
*/
void doClosure () throws IOException {
try {
handshaking.lock();
ByteBuffer tmp = allocate(BufType.APPLICATION);
WrapperResult r;
do {
tmp.clear();
tmp.flip ();
r = wrapper.wrapAndSendX (tmp, true);
} while (r.result.getStatus() != Status.CLOSED);
} finally {
handshaking.unlock();
}
}
/* do the (complete) handshake after acquiring the handshake lock.
* If two threads call this at the same time, then we depend
* on the wrapper methods being idempotent. eg. if wrapAndSend()
* is called with no data to send then there must be no problem
*/
@SuppressWarnings("fallthrough")
void doHandshake (HandshakeStatus hs_status) throws IOException {
try {
handshaking.lock();
ByteBuffer tmp = allocate(BufType.APPLICATION);
while (hs_status != HandshakeStatus.FINISHED &&
hs_status != HandshakeStatus.NOT_HANDSHAKING)
{
WrapperResult r = null;
switch (hs_status) {
case NEED_TASK:
Runnable task;
while ((task = engine.getDelegatedTask()) != null) {
/* run in current thread, because we are already
* running an external Executor
*/
task.run();
}
/* fall thru - call wrap again */
case NEED_WRAP:
tmp.clear();
tmp.flip();
r = wrapper.wrapAndSend(tmp);
break;
case NEED_UNWRAP:
tmp.clear();
r = wrapper.recvAndUnwrap (tmp);
if (r.buf != tmp) {
tmp = r.buf;
}
assert tmp.position() == 0;
break;
}
hs_status = r.result.getHandshakeStatus();
}
} finally {
handshaking.unlock();
}
}
/**
* represents an SSL input stream. Multiple https requests can
* be sent over one stream. closing this stream causes an SSL close
* input.
*/
class InputStream extends java.io.InputStream {
ByteBuffer bbuf;
boolean closed = false;
/* this stream eof */
boolean eof = false;
boolean needData = true;
InputStream () {
bbuf = allocate (BufType.APPLICATION);
}
public int read (byte[] buf, int off, int len) throws IOException {
if (closed) {
throw new IOException ("SSL stream is closed");
}
if (eof) {
return 0;
}
int available=0;
if (!needData) {
available = bbuf.remaining();
needData = (available==0);
}
if (needData) {
bbuf.clear();
WrapperResult r = recvData (bbuf);
bbuf = r.buf== bbuf? bbuf: r.buf;
if ((available=bbuf.remaining()) == 0) {
eof = true;
return 0;
} else {
needData = false;
}
}
/* copy as much as possible from buf into users buf */
if (len > available) {
len = available;
}
bbuf.get (buf, off, len);
return len;
}
public int available () throws IOException {
return bbuf.remaining();
}
public boolean markSupported () {
return false; /* not possible with SSLEngine */
}
public void reset () throws IOException {
throw new IOException ("mark/reset not supported");
}
public long skip (long s) throws IOException {
int n = (int)s;
if (closed) {
throw new IOException ("SSL stream is closed");
}
if (eof) {
return 0;
}
int ret = n;
while (n > 0) {
if (bbuf.remaining() >= n) {
bbuf.position (bbuf.position()+n);
return ret;
} else {
n -= bbuf.remaining();
bbuf.clear();
WrapperResult r = recvData (bbuf);
bbuf = r.buf==bbuf? bbuf: r.buf;
}
}
return ret; /* not reached */
}
/**
* close the SSL connection. All data must have been consumed
* before this is called. Otherwise an exception will be thrown.
* [Note. May need to revisit this. not quite the normal close() symantics
*/
public void close () throws IOException {
eof = true;
engine.closeInbound ();
}
public int read (byte[] buf) throws IOException {
return read (buf, 0, buf.length);
}
byte single[] = new byte [1];
public int read () throws IOException {
int n = read (single, 0, 1);
if (n == 0) {
return -1;
} else {
return single[0] & 0xFF;
}
}
}
/**
* represents an SSL output stream. plain text data written to this stream
* is encrypted by the stream. Multiple HTTPS responses can be sent on
* one stream. closing this stream initiates an SSL closure
*/
class OutputStream extends java.io.OutputStream {
ByteBuffer buf;
boolean closed = false;
byte single[] = new byte[1];
OutputStream() {
buf = allocate(BufType.APPLICATION);
}
public void write(int b) throws IOException {
single[0] = (byte)b;
write (single, 0, 1);
}
public void write(byte b[]) throws IOException {
write (b, 0, b.length);
}
public void write(byte b[], int off, int len) throws IOException {
if (closed) {
throw new IOException ("output stream is closed");
}
while (len > 0) {
int l = len > buf.capacity() ? buf.capacity() : len;
buf.clear();
buf.put (b, off, l);
len -= l;
off += l;
buf.flip();
WrapperResult r = sendData (buf);
if (r.result.getStatus() == Status.CLOSED) {
closed = true;
if (len > 0) {
throw new IOException ("output stream is closed");
}
}
}
}
public void flush() throws IOException {
/* no-op */
}
public void close() throws IOException {
WrapperResult r=null;
engine.closeOutbound();
closed = true;
HandshakeStatus stat = HandshakeStatus.NEED_WRAP;
buf.clear();
while (stat == HandshakeStatus.NEED_WRAP) {
r = wrapper.wrapAndSend (buf);
stat = r.result.getHandshakeStatus();
}
assert r.result.getStatus() == Status.CLOSED;
}
}
}
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