UploadPack: Add a PreUploadHook to monitor and control behavior
Embedding applications can use this hook to watch actions within UploadPack and possibly reject them. This could be useful to prevent clones of a large repository from this server, or to stop abusive negotiation rounds that offer thousands of objects in a single batch. Change-Id: Id96f1885ac4d61f22c80b6418fff54184b7348ba Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
parent
af3562f7f7
commit
64b524e3ca
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@ -44,6 +44,7 @@
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package org.eclipse.jgit.http.server;
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import static javax.servlet.http.HttpServletResponse.SC_FORBIDDEN;
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import static javax.servlet.http.HttpServletResponse.SC_SERVICE_UNAVAILABLE;
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import static javax.servlet.http.HttpServletResponse.SC_UNAUTHORIZED;
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import static org.eclipse.jgit.http.server.ServletUtils.ATTRIBUTE_HANDLER;
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import static org.eclipse.jgit.http.server.ServletUtils.getRepository;
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@ -63,6 +64,7 @@
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import org.eclipse.jgit.lib.Repository;
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import org.eclipse.jgit.transport.PacketLineOut;
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import org.eclipse.jgit.transport.RefAdvertiser.PacketLineOutRefAdvertiser;
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import org.eclipse.jgit.transport.UploadPackMayNotContinueException;
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import org.eclipse.jgit.transport.resolver.ServiceNotAuthorizedException;
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import org.eclipse.jgit.transport.resolver.ServiceNotEnabledException;
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@ -119,10 +121,10 @@ private void service(ServletRequest request, ServletResponse response)
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throws IOException {
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final HttpServletRequest req = (HttpServletRequest) request;
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final HttpServletResponse rsp = (HttpServletResponse) response;
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final SmartOutputStream buf = new SmartOutputStream(req, rsp);
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try {
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rsp.setContentType("application/x-" + svc + "-advertisement");
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final SmartOutputStream buf = new SmartOutputStream(req, rsp);
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final PacketLineOut out = new PacketLineOut(buf);
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out.writeString("# service=" + svc + "\n");
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out.end();
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@ -133,6 +135,12 @@ private void service(ServletRequest request, ServletResponse response)
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} catch (ServiceNotEnabledException e) {
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rsp.sendError(SC_FORBIDDEN);
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} catch (UploadPackMayNotContinueException e) {
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if (e.isOutput())
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buf.close();
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else
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rsp.sendError(SC_SERVICE_UNAVAILABLE);
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}
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}
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@ -45,6 +45,7 @@
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import static javax.servlet.http.HttpServletResponse.SC_FORBIDDEN;
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import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
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import static javax.servlet.http.HttpServletResponse.SC_SERVICE_UNAVAILABLE;
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import static javax.servlet.http.HttpServletResponse.SC_UNAUTHORIZED;
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import static javax.servlet.http.HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE;
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import static org.eclipse.jgit.http.server.ServletUtils.ATTRIBUTE_HANDLER;
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@ -67,6 +68,7 @@
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import org.eclipse.jgit.lib.Repository;
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import org.eclipse.jgit.transport.RefAdvertiser.PacketLineOutRefAdvertiser;
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import org.eclipse.jgit.transport.UploadPack;
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import org.eclipse.jgit.transport.UploadPackMayNotContinueException;
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import org.eclipse.jgit.transport.resolver.ServiceNotAuthorizedException;
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import org.eclipse.jgit.transport.resolver.ServiceNotEnabledException;
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import org.eclipse.jgit.transport.resolver.UploadPackFactory;
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@ -171,6 +173,11 @@ public void flush() throws IOException {
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up.upload(getInputStream(req), out, null);
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out.close();
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} catch (UploadPackMayNotContinueException e) {
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if (!e.isOutput())
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rsp.sendError(SC_SERVICE_UNAVAILABLE);
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return;
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} catch (IOException e) {
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getServletContext().log(HttpServerText.get().internalErrorDuringUploadPack, e);
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rsp.reset();
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@ -0,0 +1,158 @@
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/*
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* Copyright (C) 2011, Google Inc.
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* and other copyright owners as documented in the project's IP log.
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*
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* This program and the accompanying materials are made available
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* under the terms of the Eclipse Distribution License v1.0 which
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* accompanies this distribution, is reproduced below, and is
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* - Neither the name of the Eclipse Foundation, Inc. nor the
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* names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.eclipse.jgit.transport;
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import java.util.Collection;
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import org.eclipse.jgit.lib.ObjectId;
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/**
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* Hook invoked by {@link UploadPack} before during critical phases.
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* <p>
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* If any hook function throws {@link UploadPackMayNotContinueException} then
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* processing stops immediately and the exception is thrown up the call stack.
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* Most phases of UploadPack will try to report the exception's message text to
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* the end-user over the client's protocol connection.
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*/
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public interface PreUploadHook {
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/** A simple no-op hook. */
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public static final PreUploadHook NULL = new PreUploadHook() {
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public void onPreAdvertiseRefs(UploadPack up)
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throws UploadPackMayNotContinueException {
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// Do nothing.
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}
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public void onBeginNegotiateRound(UploadPack up,
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Collection<? extends ObjectId> wants, int cntOffered)
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throws UploadPackMayNotContinueException {
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// Do nothing.
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}
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public void onEndNegotiateRound(UploadPack up,
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Collection<? extends ObjectId> wants, int cntCommon,
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int cntNotFound, boolean ready)
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throws UploadPackMayNotContinueException {
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// Do nothing.
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}
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public void onSendPack(UploadPack up,
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Collection<? extends ObjectId> wants,
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Collection<? extends ObjectId> haves)
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throws UploadPackMayNotContinueException {
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// Do nothing.
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}
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};
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/**
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* Invoked just before {@link UploadPack#sendAdvertisedRefs(RefAdvertiser)}.
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*
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* @param up
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* the upload pack instance handling the connection.
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* @throws UploadPackMayNotContinueException
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* abort; the message will be sent to the user.
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*/
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public void onPreAdvertiseRefs(UploadPack up)
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throws UploadPackMayNotContinueException;
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/**
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* Invoked before negotiation round is started.
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*
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* @param up
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* the upload pack instance handling the connection.
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* @param wants
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* the list of wanted objects.
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* @param cntOffered
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* number of objects the client has offered.
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* @throws UploadPackMayNotContinueException
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* abort; the message will be sent to the user.
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*/
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public void onBeginNegotiateRound(UploadPack up,
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Collection<? extends ObjectId> wants, int cntOffered)
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throws UploadPackMayNotContinueException;
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/**
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* Invoked after a negotiation round is completed.
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*
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* @param up
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* the upload pack instance handling the connection.
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* @param wants
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* the list of wanted objects.
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* @param cntCommon
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* number of objects this round found to be common. In a smart
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* HTTP transaction this includes the objects that were
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* previously found to be common.
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* @param cntNotFound
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* number of objects in this round the local repository does not
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* have, but that were offered as potential common bases.
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* @param ready
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* true if a pack is ready to be sent (the commit graph was
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* successfully cut).
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* @throws UploadPackMayNotContinueException
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* abort; the message will be sent to the user.
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*/
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public void onEndNegotiateRound(UploadPack up,
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Collection<? extends ObjectId> wants, int cntCommon,
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int cntNotFound, boolean ready)
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throws UploadPackMayNotContinueException;
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/**
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* Invoked just before a pack will be sent to the client.
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*
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* @param up
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* the upload pack instance handling the connection.
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* @param wants
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* the list of wanted objects. These may be RevObject or
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* RevCommit if the processed parsed them. Implementors should
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* not rely on the values being parsed.
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* @param haves
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* the list of common objects. Empty on an initial clone request.
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* These may be RevObject or RevCommit if the processed parsed
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* them. Implementors should not rely on the values being parsed.
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* @throws UploadPackMayNotContinueException
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* abort; the message will be sent to the user.
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*/
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public void onSendPack(UploadPack up, Collection<? extends ObjectId> wants,
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Collection<? extends ObjectId> haves)
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throws UploadPackMayNotContinueException;
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}
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@ -142,6 +142,9 @@ public class UploadPack {
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/** Filter used while advertising the refs to the client. */
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private RefFilter refFilter;
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/** Hook handling the various upload phases. */
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private PreUploadHook preUploadHook = PreUploadHook.NULL;
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/** Capabilities requested by the client. */
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private final Set<String> options = new HashSet<String>();
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@ -220,6 +223,9 @@ public final RevWalk getRevWalk() {
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/** @return all refs which were advertised to the client. */
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public final Map<String, Ref> getAdvertisedRefs() {
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if (refs == null) {
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refs = refFilter.filter(db.getAllRefs());
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}
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return refs;
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}
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@ -281,6 +287,21 @@ public void setRefFilter(final RefFilter refFilter) {
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this.refFilter = refFilter != null ? refFilter : RefFilter.DEFAULT;
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}
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/** @return the configured upload hook. */
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public PreUploadHook getPreUploadHook() {
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return preUploadHook;
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}
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/**
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* Set the hook that controls how this instance will behave.
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*
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* @param hook
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* the hook; if null no special actions are taken.
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*/
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public void setPreUploadHook(PreUploadHook hook) {
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preUploadHook = hook != null ? hook : PreUploadHook.NULL;
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}
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/**
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* Set the configuration used by the pack generator.
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*
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sendAdvertisedRefs(new PacketLineOutRefAdvertiser(pckOut));
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else {
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advertised = new HashSet<ObjectId>();
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refs = refFilter.filter(db.getAllRefs());
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for (Ref ref : refs.values()) {
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for (Ref ref : getAdvertisedRefs().values()) {
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if (ref.getObjectId() != null)
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advertised.add(ref.getObjectId());
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}
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}
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recvWants();
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if (wantIds.isEmpty())
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if (wantIds.isEmpty()) {
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preUploadHook.onBeginNegotiateRound(this, wantIds, 0);
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preUploadHook.onEndNegotiateRound(this, wantIds, 0, 0, false);
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return;
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}
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if (options.contains(OPTION_MULTI_ACK_DETAILED))
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multiAck = MultiAck.DETAILED;
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@ -396,8 +419,21 @@ else if (options.contains(OPTION_MULTI_ACK))
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* the advertisement formatter.
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* @throws IOException
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* the formatter failed to write an advertisement.
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* @throws UploadPackMayNotContinueException
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* the hook denied advertisement.
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*/
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public void sendAdvertisedRefs(final RefAdvertiser adv) throws IOException {
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public void sendAdvertisedRefs(final RefAdvertiser adv) throws IOException,
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UploadPackMayNotContinueException {
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try {
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preUploadHook.onPreAdvertiseRefs(this);
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} catch (UploadPackMayNotContinueException fail) {
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if (fail.getMessage() != null) {
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adv.writeOne("ERR " + fail.getMessage());
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fail.setOutput();
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}
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throw fail;
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}
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adv.init(db);
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adv.advertiseCapability(OPTION_INCLUDE_TAG);
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adv.advertiseCapability(OPTION_MULTI_ACK_DETAILED);
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@ -408,8 +444,7 @@ public void sendAdvertisedRefs(final RefAdvertiser adv) throws IOException {
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adv.advertiseCapability(OPTION_THIN_PACK);
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adv.advertiseCapability(OPTION_NO_PROGRESS);
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adv.setDerefTags(true);
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refs = refFilter.filter(db.getAllRefs());
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advertised = adv.send(refs);
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advertised = adv.send(getAdvertisedRefs());
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adv.end();
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}
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@ -487,6 +522,16 @@ else if (multiAck != MultiAck.OFF)
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private ObjectId processHaveLines(List<ObjectId> peerHas, ObjectId last)
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throws IOException {
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try {
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preUploadHook.onBeginNegotiateRound(this, wantIds, peerHas.size());
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} catch (UploadPackMayNotContinueException fail) {
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if (fail.getMessage() != null) {
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pckOut.writeString("ERR " + fail.getMessage() + "\n");
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fail.setOutput();
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}
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throw fail;
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}
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if (peerHas.isEmpty())
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return last;
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@ -504,6 +549,7 @@ private ObjectId processHaveLines(List<ObjectId> peerHas, ObjectId last)
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needMissing = true;
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}
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int haveCnt = 0;
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AsyncRevObjectQueue q = walk.parseAny(toParse, needMissing);
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try {
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for (;;) {
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@ -557,6 +603,7 @@ private ObjectId processHaveLines(List<ObjectId> peerHas, ObjectId last)
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}
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last = obj;
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haveCnt++;
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if (obj instanceof RevCommit) {
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RevCommit c = (RevCommit) obj;
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@ -590,12 +637,15 @@ private ObjectId processHaveLines(List<ObjectId> peerHas, ObjectId last)
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} finally {
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q.release();
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}
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int missCnt = peerHas.size() - haveCnt;
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// If we don't have one of the objects but we're also willing to
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// create a pack at this point, let the client know so it stops
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// telling us about its history.
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//
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boolean didOkToGiveUp = false;
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boolean sentReady = false;
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if (0 < missCnt) {
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for (int i = peerHas.size() - 1; i >= 0; i--) {
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ObjectId id = peerHas.get(i);
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if (walk.lookupOrNull(id) == null) {
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@ -609,16 +659,30 @@ private ObjectId processHaveLines(List<ObjectId> peerHas, ObjectId last)
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break;
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case DETAILED:
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pckOut.writeString("ACK " + id.name() + " ready\n");
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sentReady = true;
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break;
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}
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}
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break;
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}
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}
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}
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if (multiAck == MultiAck.DETAILED && !didOkToGiveUp && okToGiveUp()) {
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ObjectId id = peerHas.get(peerHas.size() - 1);
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pckOut.writeString("ACK " + id.name() + " ready\n");
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sentReady = true;
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}
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try {
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preUploadHook.onEndNegotiateRound(this, wantAll, //
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haveCnt, missCnt, sentReady);
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} catch (UploadPackMayNotContinueException fail) {
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if (fail.getMessage() != null) {
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pckOut.writeString("ERR " + fail.getMessage() + "\n");
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fail.setOutput();
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}
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throw fail;
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}
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peerHas.clear();
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@ -697,6 +761,24 @@ private void sendPack() throws IOException {
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}
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}
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try {
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if (wantAll.isEmpty()) {
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preUploadHook.onSendPack(this, wantIds, commonBase);
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} else {
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preUploadHook.onSendPack(this, wantAll, commonBase);
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}
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} catch (UploadPackMayNotContinueException noPack) {
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if (sideband && noPack.getMessage() != null) {
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noPack.setOutput();
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SideBandOutputStream err = new SideBandOutputStream(
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SideBandOutputStream.CH_ERROR,
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SideBandOutputStream.SMALL_BUF, rawOut);
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err.write(Constants.encode(noPack.getMessage()));
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err.flush();
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}
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throw noPack;
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}
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PackConfig cfg = packConfig;
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if (cfg == null)
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cfg = new PackConfig(db);
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|
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@ -0,0 +1,77 @@
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/*
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* Copyright (C) 2011, Google Inc.
|
||||
* and other copyright owners as documented in the project's IP log.
|
||||
*
|
||||
* This program and the accompanying materials are made available
|
||||
* under the terms of the Eclipse Distribution License v1.0 which
|
||||
* accompanies this distribution, is reproduced below, and is
|
||||
* available at http://www.eclipse.org/org/documents/edl-v10.php
|
||||
*
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or
|
||||
* without modification, are permitted provided that the following
|
||||
* conditions are met:
|
||||
*
|
||||
* - Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* - Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
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* - Neither the name of the Eclipse Foundation, Inc. nor the
|
||||
* names of its contributors may be used to endorse or promote
|
||||
* products derived from this software without specific prior
|
||||
* written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
|
||||
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
||||
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
||||
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
||||
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
package org.eclipse.jgit.transport;
|
||||
|
||||
import java.io.IOException;
|
||||
|
||||
/** Indicates UploadPack may not continue execution. */
|
||||
public class UploadPackMayNotContinueException extends IOException {
|
||||
private static final long serialVersionUID = 1L;
|
||||
|
||||
private boolean output;
|
||||
|
||||
/** Initialize with no message. */
|
||||
public UploadPackMayNotContinueException() {
|
||||
// Do not set a message.
|
||||
}
|
||||
|
||||
/**
|
||||
* @param msg
|
||||
* a message explaining why it cannot continue. This message may
|
||||
* be shown to an end-user.
|
||||
*/
|
||||
public UploadPackMayNotContinueException(String msg) {
|
||||
super(msg);
|
||||
}
|
||||
|
||||
/** @return true if the message was already output to the client. */
|
||||
public boolean isOutput() {
|
||||
return output;
|
||||
}
|
||||
|
||||
/** Mark this message has being sent to the client. */
|
||||
public void setOutput() {
|
||||
output = true;
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue