| /* |
| * Copyright (c) 2015, 2016, 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 jdk.incubator.http; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.SocketChannel; |
| import java.util.Arrays; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReentrantLock; |
| import javax.net.ssl.SSLEngineResult.HandshakeStatus; |
| import javax.net.ssl.SSLEngineResult.Status; |
| import javax.net.ssl.*; |
| import jdk.incubator.http.internal.common.Log; |
| import jdk.incubator.http.internal.common.Utils; |
| import static javax.net.ssl.SSLEngineResult.HandshakeStatus.*; |
| |
| /** |
| * Implements the mechanics of SSL by managing an SSLEngine object. |
| * One of these is associated with each SSLConnection. |
| */ |
| class SSLDelegate { |
| |
| final SSLEngine engine; |
| final EngineWrapper wrapper; |
| final Lock handshaking = new ReentrantLock(); |
| final SSLParameters sslParameters; |
| final SocketChannel chan; |
| final HttpClientImpl client; |
| |
| // alpn[] may be null |
| SSLDelegate(SocketChannel chan, HttpClientImpl client, String[] alpn) |
| throws IOException |
| { |
| SSLContext context = client.sslContext(); |
| engine = context.createSSLEngine(); |
| engine.setUseClientMode(true); |
| SSLParameters sslp = client.sslParameters() |
| .orElseGet(context::getSupportedSSLParameters); |
| sslParameters = Utils.copySSLParameters(sslp); |
| if (alpn != null) { |
| sslParameters.setApplicationProtocols(alpn); |
| Log.logSSL(() -> "Setting application protocols: " + Arrays.toString(alpn)); |
| } else { |
| Log.logSSL("No application protocols proposed"); |
| } |
| engine.setSSLParameters(sslParameters); |
| wrapper = new EngineWrapper(chan, engine); |
| this.chan = chan; |
| this.client = client; |
| } |
| |
| SSLParameters getSSLParameters() { |
| return sslParameters; |
| } |
| |
| private static long countBytes(ByteBuffer[] buffers, int start, int number) { |
| long c = 0; |
| for (int i=0; i<number; i++) { |
| c+= buffers[start+i].remaining(); |
| } |
| return c; |
| } |
| |
| |
| static class WrapperResult { |
| static WrapperResult createOK() { |
| WrapperResult r = new WrapperResult(); |
| r.buf = null; |
| r.result = new SSLEngineResult(Status.OK, NOT_HANDSHAKING, 0, 0); |
| return r; |
| } |
| 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 |
| } |
| |
| ByteBuffer allocate (BufType type) { |
| return allocate (type, -1); |
| } |
| |
| // TODO: Use buffer pool for this |
| 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) { |
| // TODO: there should be the linear growth, rather than exponential as |
| // we definitely know the maximum amount of space required to unwrap |
| 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 { |
| } |
| |
| WrapperResult wrapAndSend(ByteBuffer src, boolean ignoreClose) |
| throws IOException |
| { |
| ByteBuffer[] buffers = new ByteBuffer[1]; |
| buffers[0] = src; |
| return wrapAndSend(buffers, 0, 1, ignoreClose); |
| } |
| |
| /* 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, |
| int offset, |
| int len, |
| 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, offset, len, 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; |
| 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; |
| } |
| } |
| |
| WrapperResult sendData (ByteBuffer src) throws IOException { |
| ByteBuffer[] buffers = new ByteBuffer[1]; |
| buffers[0] = src; |
| return sendData(buffers, 0, 1); |
| } |
| |
| /** |
| * 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. |
| */ |
| WrapperResult sendData (ByteBuffer[] src, int offset, int len) throws IOException { |
| WrapperResult r = WrapperResult.createOK(); |
| while (countBytes(src, offset, len) > 0) { |
| r = wrapper.wrapAndSend(src, offset, len, false); |
| 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. |
| */ |
| WrapperResult recvData (ByteBuffer dst) throws IOException { |
| /* we wait until some user data arrives */ |
| int mark = dst.position(); |
| WrapperResult r = null; |
| int pos = dst.position(); |
| while (dst.position() == pos) { |
| 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); |
| } |
| } |
| Utils.flipToMark(dst, mark); |
| 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.wrapAndSend(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 { |
| boolean wasBlocking = false; |
| try { |
| wasBlocking = chan.isBlocking(); |
| handshaking.lock(); |
| chan.configureBlocking(true); |
| 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, false); |
| 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(); |
| } |
| Log.logSSL(getSessionInfo()); |
| if (!wasBlocking) { |
| chan.configureBlocking(false); |
| } |
| } finally { |
| handshaking.unlock(); |
| } |
| } |
| |
| static void printParams(SSLParameters p) { |
| System.out.println("SSLParameters:"); |
| if (p == null) { |
| System.out.println("Null params"); |
| return; |
| } |
| for (String cipher : p.getCipherSuites()) { |
| System.out.printf("cipher: %s\n", cipher); |
| } |
| for (String approto : p.getApplicationProtocols()) { |
| System.out.printf("application protocol: %s\n", approto); |
| } |
| for (String protocol : p.getProtocols()) { |
| System.out.printf("protocol: %s\n", protocol); |
| } |
| if (p.getServerNames() != null) { |
| for (SNIServerName sname : p.getServerNames()) { |
| System.out.printf("server name: %s\n", sname.toString()); |
| } |
| } |
| } |
| |
| String getSessionInfo() { |
| StringBuilder sb = new StringBuilder(); |
| String application = engine.getApplicationProtocol(); |
| SSLSession sess = engine.getSession(); |
| String cipher = sess.getCipherSuite(); |
| String protocol = sess.getProtocol(); |
| sb.append("Handshake complete alpn: ") |
| .append(application) |
| .append(", Cipher: ") |
| .append(cipher) |
| .append(", Protocol: ") |
| .append(protocol); |
| return sb.toString(); |
| } |
| } |