Correctly handle non handshake commands when using SniHandler
Motivation: As we can only handle handshake commands to parse SNI we should try to skip alert and change cipher spec commands a few times before we fallback to use a default SslContext. Modifications: - Use default SslContext if no application data command was received - Use default SslContext if after 4 commands we not received a handshake command - Simplify code - Eliminate multiple volatile fields - Rename SslConstants to SslUtils - Share code between SslHandler and SniHandler by moving stuff to SslUtils Result: Correct handling of non handshake commands and cleaner code.
This commit is contained in:
Norman Maurer
parent
951bacb0ca
commit
27118ec53a
@ -37,14 +37,19 @@ import java.util.Locale;
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*/
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public class SniHandler extends ByteToMessageDecoder {
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// Maximal number of ssl records to inspect before fallback to the default SslContext.
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private static final int MAX_SSL_RECORDS = 4;
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private static final InternalLogger logger =
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InternalLoggerFactory.getInstance(SniHandler.class);
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private static final Selection EMPTY_SELECTION = new Selection(null, null);
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private final DomainNameMapping<SslContext> mapping;
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private boolean handshaken;
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private volatile String hostname;
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private volatile SslContext selectedContext;
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private boolean handshakeFailed;
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private volatile Selection selection = EMPTY_SELECTION;
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/**
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* Create a SNI detection handler with configured {@link SslContext}
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@ -59,127 +64,159 @@ public class SniHandler extends ByteToMessageDecoder {
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}
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this.mapping = (DomainNameMapping<SslContext>) mapping;
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handshaken = false;
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}
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/**
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* @return the selected hostname
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*/
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public String hostname() {
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return hostname;
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return selection.hostname;
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}
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/**
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* @return the selected sslcontext
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*/
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public SslContext sslContext() {
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return selectedContext;
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return selection.context;
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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if (!handshaken && in.readableBytes() >= 5) {
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String hostname = sniHostNameFromHandshakeInfo(in);
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if (hostname != null) {
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hostname = IDN.toASCII(hostname, IDN.ALLOW_UNASSIGNED).toLowerCase(Locale.US);
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if (!handshakeFailed && in.readableBytes() >= SslUtils.SSL_RECORD_HEADER_LENGTH) {
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int writerIndex = in.writerIndex();
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int readerIndex = in.readerIndex();
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try {
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loop: for (int i = 0; i < MAX_SSL_RECORDS; i++) {
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int command = in.getUnsignedByte(readerIndex);
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// tls, but not handshake command
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switch (command) {
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case SslUtils.SSL_CONTENT_TYPE_CHANGE_CIPHER_SPEC:
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case SslUtils.SSL_CONTENT_TYPE_ALERT:
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int len = SslUtils.getEncryptedPacketLength(in, readerIndex);
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// Not an SSL/TLS packet
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if (len == -1) {
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handshakeFailed = true;
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NotSslRecordException e = new NotSslRecordException(
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"not an SSL/TLS record: " + ByteBufUtil.hexDump(in));
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in.skipBytes(in.readableBytes());
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ctx.fireExceptionCaught(e);
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SslUtils.notifyHandshakeFailure(ctx, e);
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return;
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}
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if (writerIndex - readerIndex - SslUtils.SSL_RECORD_HEADER_LENGTH < len) {
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// Not enough data
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return;
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}
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// increase readerIndex and try again.
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readerIndex += len;
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continue;
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case SslUtils.SSL_CONTENT_TYPE_HANDSHAKE:
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int majorVersion = in.getUnsignedByte(readerIndex + 1);
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// SSLv3 or TLS
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if (majorVersion == 3) {
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int packetLength = in.getUnsignedShort(readerIndex + 3)
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+ SslUtils.SSL_RECORD_HEADER_LENGTH;
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if (in.readableBytes() < packetLength) {
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// client hello incomplete try again to decode once more data is ready.
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return;
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}
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// See https://tools.ietf.org/html/rfc5246#section-7.4.1.2
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//
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// Decode the ssl client hello packet.
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// We have to skip bytes until SessionID (which sum to 43 bytes).
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//
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// struct {
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// ProtocolVersion client_version;
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// Random random;
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// SessionID session_id;
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// CipherSuite cipher_suites<2..2^16-2>;
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// CompressionMethod compression_methods<1..2^8-1>;
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// select (extensions_present) {
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// case false:
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// struct {};
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// case true:
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// Extension extensions<0..2^16-1>;
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// };
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// } ClientHello;
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//
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int offset = readerIndex + 43;
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int sessionIdLength = in.getUnsignedByte(offset);
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offset += sessionIdLength + 1;
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int cipherSuitesLength = in.getUnsignedShort(offset);
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offset += cipherSuitesLength + 2;
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int compressionMethodLength = in.getUnsignedByte(offset);
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offset += compressionMethodLength + 1;
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int extensionsLength = in.getUnsignedShort(offset);
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offset += 2;
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int extensionsLimit = offset + extensionsLength;
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while (offset < extensionsLimit) {
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int extensionType = in.getUnsignedShort(offset);
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offset += 2;
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int extensionLength = in.getUnsignedShort(offset);
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offset += 2;
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// SNI
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// See https://tools.ietf.org/html/rfc6066#page-6
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if (extensionType == 0) {
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int serverNameType = in.getUnsignedByte(offset + 2);
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if (serverNameType == 0) {
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int serverNameLength = in.getUnsignedShort(offset + 3);
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String hostname = in.toString(offset + 5, serverNameLength,
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CharsetUtil.UTF_8);
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select(ctx, IDN.toASCII(hostname,
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IDN.ALLOW_UNASSIGNED).toLowerCase(Locale.US));
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return;
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} else {
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// invalid enum value
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break loop;
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}
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}
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offset += extensionLength;
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}
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}
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// Fall-through
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default:
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//not tls, ssl or application data, do not try sni
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break loop;
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}
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}
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} catch (Throwable e) {
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// unexpected encoding, ignore sni and use default
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if (logger.isDebugEnabled()) {
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logger.debug("Unexpected client hello packet: " + ByteBufUtil.hexDump(in), e);
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}
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}
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this.hostname = hostname;
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// the mapping will return default context when this.hostname is null
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selectedContext = mapping.map(hostname);
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}
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if (handshaken) {
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SslHandler sslHandler = selectedContext.newHandler(ctx.alloc());
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ctx.pipeline().replace(this, SslHandler.class.getName(), sslHandler);
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// Just select the default SslContext
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select(ctx, null);
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}
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}
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private String sniHostNameFromHandshakeInfo(ByteBuf in) {
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int readerIndex = in.readerIndex();
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try {
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int command = in.getUnsignedByte(readerIndex);
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private void select(ChannelHandlerContext ctx, String hostname) {
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SslContext selectedContext = mapping.map(hostname);
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selection = new Selection(selectedContext, hostname);
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SslHandler sslHandler = selectedContext.newHandler(ctx.alloc());
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ctx.pipeline().replace(this, SslHandler.class.getName(), sslHandler);
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}
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// tls, but not handshake command
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switch (command) {
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case SslConstants.SSL_CONTENT_TYPE_CHANGE_CIPHER_SPEC:
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case SslConstants.SSL_CONTENT_TYPE_ALERT:
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case SslConstants.SSL_CONTENT_TYPE_APPLICATION_DATA:
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return null;
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case SslConstants.SSL_CONTENT_TYPE_HANDSHAKE:
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break;
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default:
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//not tls or sslv3, do not try sni
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handshaken = true;
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return null;
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}
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private static final class Selection {
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final SslContext context;
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final String hostname;
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int majorVersion = in.getUnsignedByte(readerIndex + 1);
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// SSLv3 or TLS
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if (majorVersion == 3) {
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int packetLength = in.getUnsignedShort(readerIndex + 3) + 5;
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if (in.readableBytes() >= packetLength) {
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// decode the ssl client hello packet
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// we have to skip some var-length fields
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int offset = readerIndex + 43;
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int sessionIdLength = in.getUnsignedByte(offset);
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offset += sessionIdLength + 1;
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int cipherSuitesLength = in.getUnsignedShort(offset);
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offset += cipherSuitesLength + 2;
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int compressionMethodLength = in.getUnsignedByte(offset);
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offset += compressionMethodLength + 1;
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int extensionsLength = in.getUnsignedShort(offset);
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offset += 2;
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int extensionsLimit = offset + extensionsLength;
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while (offset < extensionsLimit) {
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int extensionType = in.getUnsignedShort(offset);
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offset += 2;
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int extensionLength = in.getUnsignedShort(offset);
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offset += 2;
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// SNI
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if (extensionType == 0) {
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handshaken = true;
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int serverNameType = in.getUnsignedByte(offset + 2);
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if (serverNameType == 0) {
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int serverNameLength = in.getUnsignedShort(offset + 3);
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return in.toString(offset + 5, serverNameLength,
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CharsetUtil.UTF_8);
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} else {
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// invalid enum value
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return null;
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}
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}
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offset += extensionLength;
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}
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handshaken = true;
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return null;
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} else {
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// client hello incomplete
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return null;
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}
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} else {
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handshaken = true;
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return null;
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}
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} catch (Throwable e) {
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// unexpected encoding, ignore sni and use default
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if (logger.isDebugEnabled()) {
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logger.debug("Unexpected client hello packet: " + ByteBufUtil.hexDump(in), e);
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}
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handshaken = true;
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return null;
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Selection(SslContext context, String hostname) {
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this.context = context;
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this.hostname = hostname;
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}
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}
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}
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@ -1,45 +0,0 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.ssl;
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/**
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* Constants for SSL packets.
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*/
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final class SslConstants {
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/**
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* change cipher spec
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*/
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public static final int SSL_CONTENT_TYPE_CHANGE_CIPHER_SPEC = 20;
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/**
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* alert
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*/
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public static final int SSL_CONTENT_TYPE_ALERT = 21;
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/**
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* handshake
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*/
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public static final int SSL_CONTENT_TYPE_HANDSHAKE = 22;
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/**
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* application data
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*/
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public static final int SSL_CONTENT_TYPE_APPLICATION_DATA = 23;
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private SslConstants() {
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}
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}
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@ -66,6 +66,8 @@ import java.util.concurrent.ScheduledFuture;
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import java.util.concurrent.TimeUnit;
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import java.util.regex.Pattern;
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import static io.netty.handler.ssl.SslUtils.getEncryptedPacketLength;
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/**
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* Adds <a href="http://en.wikipedia.org/wiki/Transport_Layer_Security">SSL
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* · TLS</a> and StartTLS support to a {@link Channel}. Please refer
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@ -813,84 +815,13 @@ public class SslHandler extends ByteToMessageDecoder implements ChannelOutboundH
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* Is thrown if the given {@link ByteBuf} has not at least 5 bytes to read.
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*/
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public static boolean isEncrypted(ByteBuf buffer) {
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if (buffer.readableBytes() < 5) {
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throw new IllegalArgumentException("buffer must have at least 5 readable bytes");
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if (buffer.readableBytes() < SslUtils.SSL_RECORD_HEADER_LENGTH) {
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throw new IllegalArgumentException(
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"buffer must have at least " + SslUtils.SSL_RECORD_HEADER_LENGTH + " readable bytes");
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}
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return getEncryptedPacketLength(buffer, buffer.readerIndex()) != -1;
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}
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/**
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* Return how much bytes can be read out of the encrypted data. Be aware that this method will not increase
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* the readerIndex of the given {@link ByteBuf}.
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*
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* @param buffer
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* The {@link ByteBuf} to read from. Be aware that it must have at least 5 bytes to read,
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* otherwise it will throw an {@link IllegalArgumentException}.
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* @return length
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* The length of the encrypted packet that is included in the buffer. This will
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* return {@code -1} if the given {@link ByteBuf} is not encrypted at all.
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* @throws IllegalArgumentException
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* Is thrown if the given {@link ByteBuf} has not at least 5 bytes to read.
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*/
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private static int getEncryptedPacketLength(ByteBuf buffer, int offset) {
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int packetLength = 0;
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// SSLv3 or TLS - Check ContentType
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boolean tls;
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switch (buffer.getUnsignedByte(offset)) {
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case 20: // change_cipher_spec
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case 21: // alert
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case 22: // handshake
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case 23: // application_data
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tls = true;
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break;
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default:
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// SSLv2 or bad data
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tls = false;
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}
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if (tls) {
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// SSLv3 or TLS - Check ProtocolVersion
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int majorVersion = buffer.getUnsignedByte(offset + 1);
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if (majorVersion == 3) {
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// SSLv3 or TLS
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packetLength = buffer.getUnsignedShort(offset + 3) + 5;
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if (packetLength <= 5) {
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// Neither SSLv3 or TLSv1 (i.e. SSLv2 or bad data)
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tls = false;
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}
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} else {
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// Neither SSLv3 or TLSv1 (i.e. SSLv2 or bad data)
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tls = false;
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}
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}
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if (!tls) {
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// SSLv2 or bad data - Check the version
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boolean sslv2 = true;
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int headerLength = (buffer.getUnsignedByte(offset) & 0x80) != 0 ? 2 : 3;
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int majorVersion = buffer.getUnsignedByte(offset + headerLength + 1);
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if (majorVersion == 2 || majorVersion == 3) {
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// SSLv2
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if (headerLength == 2) {
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packetLength = (buffer.getShort(offset) & 0x7FFF) + 2;
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} else {
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packetLength = (buffer.getShort(offset) & 0x3FFF) + 3;
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}
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if (packetLength <= headerLength) {
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sslv2 = false;
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}
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} else {
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sslv2 = false;
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}
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if (!sslv2) {
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return -1;
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}
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}
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return packetLength;
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws SSLException {
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final int startOffset = in.readerIndex();
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@ -913,7 +844,7 @@ public class SslHandler extends ByteToMessageDecoder implements ChannelOutboundH
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while (totalLength < OpenSslEngine.MAX_ENCRYPTED_PACKET_LENGTH) {
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final int readableBytes = endOffset - offset;
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if (readableBytes < 5) {
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if (readableBytes < SslUtils.SSL_RECORD_HEADER_LENGTH) {
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break;
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}
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@ -1299,8 +1230,7 @@ public class SslHandler extends ByteToMessageDecoder implements ChannelOutboundH
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private void notifyHandshakeFailure(Throwable cause) {
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if (handshakePromise.tryFailure(cause)) {
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ctx.fireUserEventTriggered(new SslHandshakeCompletionEvent(cause));
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ctx.close();
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SslUtils.notifyHandshakeFailure(ctx, cause);
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}
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}
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127
handler/src/main/java/io/netty/handler/ssl/SslUtils.java
Normal file
127
handler/src/main/java/io/netty/handler/ssl/SslUtils.java
Normal file
@ -0,0 +1,127 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
|
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* version 2.0 (the "License"); you may not use this file except in compliance
|
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* with the License. You may obtain a copy of the License at:
|
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*
|
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* http://www.apache.org/licenses/LICENSE-2.0
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*
|
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* Unless required by applicable law or agreed to in writing, software
|
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
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* License for the specific language governing permissions and limitations
|
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* under the License.
|
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*/
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package io.netty.handler.ssl;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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/**
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* Constants for SSL packets.
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*/
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final class SslUtils {
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/**
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* change cipher spec
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*/
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public static final int SSL_CONTENT_TYPE_CHANGE_CIPHER_SPEC = 20;
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/**
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* alert
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*/
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public static final int SSL_CONTENT_TYPE_ALERT = 21;
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/**
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* handshake
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*/
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public static final int SSL_CONTENT_TYPE_HANDSHAKE = 22;
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/**
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* application data
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*/
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public static final int SSL_CONTENT_TYPE_APPLICATION_DATA = 23;
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/**
|
||||
* the length of the ssl record header (in bytes)
|
||||
*/
|
||||
public static final int SSL_RECORD_HEADER_LENGTH = 5;
|
||||
|
||||
/**
|
||||
* Return how much bytes can be read out of the encrypted data. Be aware that this method will not increase
|
||||
* the readerIndex of the given {@link ByteBuf}.
|
||||
*
|
||||
* @param buffer
|
||||
* The {@link ByteBuf} to read from. Be aware that it must have at least
|
||||
* {@link #SSL_RECORD_HEADER_LENGTH} bytes to read,
|
||||
* otherwise it will throw an {@link IllegalArgumentException}.
|
||||
* @return length
|
||||
* The length of the encrypted packet that is included in the buffer. This will
|
||||
* return {@code -1} if the given {@link ByteBuf} is not encrypted at all.
|
||||
* @throws IllegalArgumentException
|
||||
* Is thrown if the given {@link ByteBuf} has not at least {@link #SSL_RECORD_HEADER_LENGTH}
|
||||
* bytes to read.
|
||||
*/
|
||||
static int getEncryptedPacketLength(ByteBuf buffer, int offset) {
|
||||
int packetLength = 0;
|
||||
|
||||
// SSLv3 or TLS - Check ContentType
|
||||
boolean tls;
|
||||
switch (buffer.getUnsignedByte(offset)) {
|
||||
case SSL_CONTENT_TYPE_CHANGE_CIPHER_SPEC:
|
||||
case SSL_CONTENT_TYPE_ALERT:
|
||||
case SSL_CONTENT_TYPE_HANDSHAKE:
|
||||
case SSL_CONTENT_TYPE_APPLICATION_DATA:
|
||||
tls = true;
|
||||
break;
|
||||
default:
|
||||
// SSLv2 or bad data
|
||||
tls = false;
|
||||
}
|
||||
|
||||
if (tls) {
|
||||
// SSLv3 or TLS - Check ProtocolVersion
|
||||
int majorVersion = buffer.getUnsignedByte(offset + 1);
|
||||
if (majorVersion == 3) {
|
||||
// SSLv3 or TLS
|
||||
packetLength = buffer.getUnsignedShort(offset + 3) + SSL_RECORD_HEADER_LENGTH;
|
||||
if (packetLength <= SSL_RECORD_HEADER_LENGTH) {
|
||||
// Neither SSLv3 or TLSv1 (i.e. SSLv2 or bad data)
|
||||
tls = false;
|
||||
}
|
||||
} else {
|
||||
// Neither SSLv3 or TLSv1 (i.e. SSLv2 or bad data)
|
||||
tls = false;
|
||||
}
|
||||
}
|
||||
|
||||
if (!tls) {
|
||||
// SSLv2 or bad data - Check the version
|
||||
int headerLength = (buffer.getUnsignedByte(offset) & 0x80) != 0 ? 2 : 3;
|
||||
int majorVersion = buffer.getUnsignedByte(offset + headerLength + 1);
|
||||
if (majorVersion == 2 || majorVersion == 3) {
|
||||
// SSLv2
|
||||
if (headerLength == 2) {
|
||||
packetLength = (buffer.getShort(offset) & 0x7FFF) + 2;
|
||||
} else {
|
||||
packetLength = (buffer.getShort(offset) & 0x3FFF) + 3;
|
||||
}
|
||||
if (packetLength <= headerLength) {
|
||||
return -1;
|
||||
}
|
||||
} else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
return packetLength;
|
||||
}
|
||||
|
||||
static void notifyHandshakeFailure(ChannelHandlerContext ctx, Throwable cause) {
|
||||
ctx.fireUserEventTriggered(new SslHandshakeCompletionEvent(cause));
|
||||
ctx.close();
|
||||
}
|
||||
|
||||
private SslUtils() {
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user