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com.google.gerrit.httpd.GitOverHttpServlet Maven / Gradle / Ivy
// Copyright (C) 2010 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.httpd;
import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
import static org.eclipse.jgit.http.server.GitSmartHttpTools.sendError;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.cache.Cache;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Lists;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.data.Capable;
import com.google.gerrit.entities.Project;
import com.google.gerrit.extensions.registration.DynamicSet;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.server.AccessPath;
import com.google.gerrit.server.AnonymousUser;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.RequestInfo;
import com.google.gerrit.server.RequestListener;
import com.google.gerrit.server.audit.HttpAuditEvent;
import com.google.gerrit.server.cache.CacheModule;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.git.PermissionAwareRepositoryManager;
import com.google.gerrit.server.git.TracingHook;
import com.google.gerrit.server.git.TransferConfig;
import com.google.gerrit.server.git.UploadPackInitializer;
import com.google.gerrit.server.git.UsersSelfAdvertiseRefsHook;
import com.google.gerrit.server.git.receive.AsyncReceiveCommits;
import com.google.gerrit.server.git.validators.UploadValidators;
import com.google.gerrit.server.group.GroupAuditService;
import com.google.gerrit.server.logging.TraceContext;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.permissions.ProjectPermission;
import com.google.gerrit.server.plugincontext.PluginSetContext;
import com.google.gerrit.server.project.ProjectCache;
import com.google.gerrit.server.project.ProjectState;
import com.google.gerrit.server.util.time.TimeUtil;
import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.google.inject.TypeLiteral;
import com.google.inject.name.Named;
import java.io.IOException;
import java.text.MessageFormat;
import java.time.Duration;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicLong;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import org.eclipse.jgit.errors.PackProtocolException;
import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.eclipse.jgit.http.server.GitServlet;
import org.eclipse.jgit.http.server.GitSmartHttpTools;
import org.eclipse.jgit.http.server.HttpServerText;
import org.eclipse.jgit.http.server.ServletUtils;
import org.eclipse.jgit.http.server.UploadPackErrorHandler;
import org.eclipse.jgit.http.server.resolver.AsIsFileService;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.PostUploadHook;
import org.eclipse.jgit.transport.PostUploadHookChain;
import org.eclipse.jgit.transport.PreUploadHook;
import org.eclipse.jgit.transport.PreUploadHookChain;
import org.eclipse.jgit.transport.ReceivePack;
import org.eclipse.jgit.transport.ServiceMayNotContinueException;
import org.eclipse.jgit.transport.UploadPack;
import org.eclipse.jgit.transport.resolver.ReceivePackFactory;
import org.eclipse.jgit.transport.resolver.RepositoryResolver;
import org.eclipse.jgit.transport.resolver.ServiceNotAuthorizedException;
import org.eclipse.jgit.transport.resolver.ServiceNotEnabledException;
import org.eclipse.jgit.transport.resolver.UploadPackFactory;
/** Serves Git repositories over HTTP. */
@Singleton
public class GitOverHttpServlet extends GitServlet {
private static final long serialVersionUID = 1L;
private static final String ATT_STATE = ProjectState.class.getName();
private static final String ATT_ARC = AsyncReceiveCommits.class.getName();
private static final String ID_CACHE = "adv_bases";
public static final String URL_REGEX;
public static final String GIT_COMMAND_STATUS_HEADER = "X-git-command-status";
private enum GIT_COMMAND_STATUS {
OK(0),
FAIL(-1);
private final int exitStatus;
GIT_COMMAND_STATUS(int exitStatus) {
this.exitStatus = exitStatus;
}
@Override
public String toString() {
return Integer.toString(exitStatus);
}
}
static {
StringBuilder url = new StringBuilder();
url.append("^(?:/a)?(?:/p/|/)(.*/(?:info/refs");
for (String name : GitSmartHttpTools.VALID_SERVICES) {
url.append('|').append(name);
}
url.append("))$");
URL_REGEX = url.toString();
}
static class GitOverHttpServletModule extends AbstractModule {
private final boolean enableReceive;
GitOverHttpServletModule(boolean enableReceive) {
this.enableReceive = enableReceive;
}
@Override
protected void configure() {
bind(Resolver.class);
bind(UploadFactory.class);
bind(UploadFilter.class);
bind(new TypeLiteral>() {})
.to(enableReceive ? ReceiveFactory.class : DisabledReceiveFactory.class);
bind(ReceiveFilter.class);
install(
new CacheModule() {
@Override
protected void configure() {
cache(ID_CACHE, AdvertisedObjectsCacheKey.class, new TypeLiteral>() {})
.maximumWeight(4096)
.expireAfterWrite(Duration.ofMinutes(10));
}
});
// Don't bind Metrics, which is bound in a parent injector in tests.
}
}
@VisibleForTesting
@Singleton
public static class Metrics {
// Recording requests separately in this class is only necessary because of a bug in the
// implementation of the generic RequestMetricsFilter; see
// https://gerrit-review.googlesource.com/c/gerrit/+/211692
private final AtomicLong requestsStarted = new AtomicLong();
void requestStarted() {
requestsStarted.incrementAndGet();
}
public long getRequestsStarted() {
return requestsStarted.get();
}
}
static class HttpServletResponseWithStatusWrapper extends HttpServletResponseWrapper {
private int responseStatus;
HttpServletResponseWithStatusWrapper(HttpServletResponse response) {
super(response);
/* Even if we could read the status from response, we assume that it is all
* fine because we entered the filter without any prior issues.
* When Google will have upgraded to Servlet 3.0, we could actually
* call response.getStatus() and the code will be clearer.
*/
responseStatus = HttpServletResponse.SC_OK;
}
@Override
public void setStatus(int sc) {
responseStatus = sc;
super.setStatus(sc);
}
@SuppressWarnings("deprecation")
@Override
public void setStatus(int sc, String sm) {
responseStatus = sc;
super.setStatus(sc, sm);
}
@Override
public void sendError(int sc) throws IOException {
this.responseStatus = sc;
super.sendError(sc);
}
@Override
public void sendError(int sc, String msg) throws IOException {
this.responseStatus = sc;
super.sendError(sc, msg);
}
@Override
public void sendRedirect(String location) throws IOException {
this.responseStatus = HttpServletResponse.SC_MOVED_TEMPORARILY;
super.sendRedirect(location);
}
public int getResponseStatus() {
return responseStatus;
}
}
@Inject
GitOverHttpServlet(
Resolver resolver,
UploadFactory upload,
UploadFilter uploadFilter,
GerritUploadPackErrorHandler uploadPackErrorHandler,
ReceivePackFactory receive,
ReceiveFilter receiveFilter) {
setRepositoryResolver(resolver);
setAsIsFileService(AsIsFileService.DISABLED);
setUploadPackFactory(upload);
setUploadPackErrorHandler(uploadPackErrorHandler);
addUploadPackFilter(uploadFilter);
setReceivePackFactory(receive);
addReceivePackFilter(receiveFilter);
}
private static String extractWhat(HttpServletRequest request) {
StringBuilder commandName = new StringBuilder(request.getRequestURL());
if (request.getQueryString() != null) {
commandName.append("?").append(request.getQueryString());
}
return commandName.toString();
}
private static ListMultimap extractParameters(HttpServletRequest request) {
if (request.getQueryString() == null) {
return ImmutableListMultimap.of();
}
// Explicit cast is required to compile under Servlet API 2.5, where the return type is raw Map.
@SuppressWarnings("cast")
Map parameterMap = (Map) request.getParameterMap();
ImmutableListMultimap.Builder b = ImmutableListMultimap.builder();
parameterMap.forEach(b::putAll);
return b.build();
}
static class Resolver implements RepositoryResolver {
private final GitRepositoryManager manager;
private final PermissionBackend permissionBackend;
private final Provider userProvider;
private final ProjectCache projectCache;
@Inject
Resolver(
GitRepositoryManager manager,
PermissionBackend permissionBackend,
Provider userProvider,
ProjectCache projectCache) {
this.manager = manager;
this.permissionBackend = permissionBackend;
this.userProvider = userProvider;
this.projectCache = projectCache;
}
@Override
public Repository open(HttpServletRequest req, String projectName)
throws RepositoryNotFoundException, ServiceNotAuthorizedException,
ServiceNotEnabledException, ServiceMayNotContinueException {
while (projectName.endsWith("/")) {
projectName = projectName.substring(0, projectName.length() - 1);
}
if (projectName.endsWith(".git")) {
// Be nice and drop the trailing ".git" suffix, which we never keep
// in our database, but clients might mistakenly provide anyway.
//
projectName = projectName.substring(0, projectName.length() - 4);
while (projectName.endsWith("/")) {
projectName = projectName.substring(0, projectName.length() - 1);
}
}
CurrentUser user = userProvider.get();
user.setAccessPath(AccessPath.GIT);
try {
Project.NameKey nameKey = Project.nameKey(projectName);
ProjectState state =
projectCache
.get(nameKey)
.orElseThrow(() -> new RepositoryNotFoundException(nameKey.get()));
if (!state.statePermitsRead()) {
throw new RepositoryNotFoundException(nameKey.get());
}
req.setAttribute(ATT_STATE, state);
try {
permissionBackend.user(user).project(nameKey).check(ProjectPermission.ACCESS);
} catch (AuthException e) {
if (user instanceof AnonymousUser) {
throw new ServiceNotAuthorizedException();
}
throw new RepositoryNotFoundException(nameKey.get(), e);
}
return manager.openRepository(nameKey);
} catch (IOException | PermissionBackendException err) {
throw new ServiceMayNotContinueException(projectName + " unavailable", err);
}
}
}
static class UploadFactory implements UploadPackFactory {
private final TransferConfig config;
private final DynamicSet preUploadHooks;
private final DynamicSet postUploadHooks;
private final PluginSetContext uploadPackInitializers;
private final PermissionBackend permissionBackend;
@Inject
UploadFactory(
TransferConfig tc,
DynamicSet preUploadHooks,
DynamicSet postUploadHooks,
PluginSetContext uploadPackInitializers,
PermissionBackend permissionBackend) {
this.config = tc;
this.preUploadHooks = preUploadHooks;
this.postUploadHooks = postUploadHooks;
this.uploadPackInitializers = uploadPackInitializers;
this.permissionBackend = permissionBackend;
}
@Override
public UploadPack create(HttpServletRequest req, Repository repo) {
ProjectState state = (ProjectState) req.getAttribute(ATT_STATE);
UploadPack up =
new UploadPack(
PermissionAwareRepositoryManager.wrap(
repo, permissionBackend.currentUser().project(state.getNameKey())));
up.setPackConfig(config.getPackConfig());
up.setTimeout(config.getTimeout());
up.setPreUploadHook(PreUploadHookChain.newChain(Lists.newArrayList(preUploadHooks)));
up.setPostUploadHook(PostUploadHookChain.newChain(Lists.newArrayList(postUploadHooks)));
String header = req.getHeader("Git-Protocol");
if (header != null) {
String[] params = header.split(":");
up.setExtraParameters(Arrays.asList(params));
}
uploadPackInitializers.runEach(initializer -> initializer.init(state.getNameKey(), up));
return up;
}
}
static class UploadFilter implements Filter {
private final UploadValidators.Factory uploadValidatorsFactory;
private final PermissionBackend permissionBackend;
private final Provider userProvider;
private final GroupAuditService groupAuditService;
private final Metrics metrics;
private final PluginSetContext requestListeners;
private final UsersSelfAdvertiseRefsHook usersSelfAdvertiseRefsHook;
private final Provider sessionProvider;
@Inject
UploadFilter(
UploadValidators.Factory uploadValidatorsFactory,
PermissionBackend permissionBackend,
Provider userProvider,
GroupAuditService groupAuditService,
Metrics metrics,
PluginSetContext requestListeners,
UsersSelfAdvertiseRefsHook usersSelfAdvertiseRefsHook,
Provider sessionProvider) {
this.uploadValidatorsFactory = uploadValidatorsFactory;
this.permissionBackend = permissionBackend;
this.userProvider = userProvider;
this.groupAuditService = groupAuditService;
this.metrics = metrics;
this.requestListeners = requestListeners;
this.usersSelfAdvertiseRefsHook = usersSelfAdvertiseRefsHook;
this.sessionProvider = sessionProvider;
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain next)
throws IOException, ServletException {
metrics.requestStarted();
// The Resolver above already checked READ access for us.
Repository repo = ServletUtils.getRepository(request);
ProjectState state = (ProjectState) request.getAttribute(ATT_STATE);
UploadPack up = (UploadPack) request.getAttribute(ServletUtils.ATTRIBUTE_HANDLER);
PermissionBackend.ForProject perm =
permissionBackend.currentUser().project(state.getNameKey());
HttpServletResponseWithStatusWrapper responseWrapper =
new HttpServletResponseWithStatusWrapper((HttpServletResponse) response);
HttpServletRequest httpRequest = (HttpServletRequest) request;
String sessionId = getSessionIdOrNull(sessionProvider);
try (TraceContext traceContext = TraceContext.open()) {
RequestInfo requestInfo =
RequestInfo.builder(
RequestInfo.RequestType.GIT_UPLOAD, userProvider.get(), traceContext)
.project(state.getNameKey())
.build();
requestListeners.runEach(l -> l.onRequest(requestInfo));
try {
if (!perm.test(ProjectPermission.RUN_UPLOAD_PACK)) {
GitSmartHttpTools.sendError(
(HttpServletRequest) request,
responseWrapper,
HttpServletResponse.SC_FORBIDDEN,
"upload-pack not permitted on this server");
return;
}
} catch (PermissionBackendException e) {
responseWrapper.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
throw new ServletException(e);
}
// We use getRemoteHost() here instead of getRemoteAddr() because REMOTE_ADDR
// may have been overridden by a proxy server -- we'll try to avoid this.
UploadValidators uploadValidators =
uploadValidatorsFactory.create(state.getProject(), repo, request.getRemoteHost());
up.setPreUploadHook(
PreUploadHookChain.newChain(
Lists.newArrayList(up.getPreUploadHook(), uploadValidators)));
if (state.isAllUsers()) {
up.setAdvertiseRefsHook(usersSelfAdvertiseRefsHook);
}
try (TracingHook tracingHook = new TracingHook()) {
up.setProtocolV2Hook(tracingHook);
next.doFilter(httpRequest, responseWrapper);
}
} finally {
groupAuditService.dispatch(
new HttpAuditEvent(
sessionId,
userProvider.get(),
extractWhat(httpRequest),
TimeUtil.nowMs(),
extractParameters(httpRequest),
httpRequest.getMethod(),
httpRequest,
responseWrapper.getResponseStatus(),
responseWrapper));
}
}
@Override
public void init(FilterConfig config) {}
@Override
public void destroy() {}
}
static class GerritUploadPackErrorHandler implements UploadPackErrorHandler {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
@Override
public void upload(HttpServletRequest req, HttpServletResponse rsp, UploadPackRunnable r)
throws IOException {
rsp.setHeader(GIT_COMMAND_STATUS_HEADER, GIT_COMMAND_STATUS.FAIL.toString());
try {
r.upload();
rsp.setHeader(GIT_COMMAND_STATUS_HEADER, GIT_COMMAND_STATUS.OK.toString());
} catch (ServiceMayNotContinueException e) {
if (!e.isOutput() && !rsp.isCommitted()) {
rsp.reset();
sendError(req, rsp, e.getStatusCode(), e.getMessage());
}
} catch (Throwable e) {
logger.atSevere().withCause(e).log(
"%s",
MessageFormat.format(
HttpServerText.get().internalErrorDuringUploadPack,
ServletUtils.getRepository(req)));
if (!rsp.isCommitted()) {
rsp.reset();
String msg = e instanceof PackProtocolException ? e.getMessage() : null;
sendError(req, rsp, SC_INTERNAL_SERVER_ERROR, msg);
}
}
}
}
static class ReceiveFactory implements ReceivePackFactory {
private final AsyncReceiveCommits.Factory factory;
private final Provider userProvider;
@Inject
ReceiveFactory(AsyncReceiveCommits.Factory factory, Provider userProvider) {
this.factory = factory;
this.userProvider = userProvider;
}
@Override
public ReceivePack create(HttpServletRequest req, Repository db)
throws ServiceNotAuthorizedException {
final ProjectState state = (ProjectState) req.getAttribute(ATT_STATE);
if (!userProvider.get().isIdentifiedUser()) {
// Anonymous users are not permitted to push.
throw new ServiceNotAuthorizedException();
}
AsyncReceiveCommits arc =
factory.create(state, userProvider.get().asIdentifiedUser(), db, null);
ReceivePack rp = arc.getReceivePack();
req.setAttribute(ATT_ARC, arc);
return rp;
}
}
static class DisabledReceiveFactory implements ReceivePackFactory {
@Override
public ReceivePack create(HttpServletRequest req, Repository db)
throws ServiceNotEnabledException {
throw new ServiceNotEnabledException();
}
}
static class ReceiveFilter implements Filter {
private final Cache> cache;
private final PermissionBackend permissionBackend;
private final Provider userProvider;
private final GroupAuditService groupAuditService;
private final Metrics metrics;
private final Provider sessionProvider;
@Inject
ReceiveFilter(
@Named(ID_CACHE) Cache> cache,
PermissionBackend permissionBackend,
Provider userProvider,
GroupAuditService groupAuditService,
Metrics metrics,
Provider sessionProvider) {
this.cache = cache;
this.permissionBackend = permissionBackend;
this.userProvider = userProvider;
this.groupAuditService = groupAuditService;
this.metrics = metrics;
this.sessionProvider = sessionProvider;
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
metrics.requestStarted();
boolean isGet = "GET".equalsIgnoreCase(((HttpServletRequest) request).getMethod());
AsyncReceiveCommits arc = (AsyncReceiveCommits) request.getAttribute(ATT_ARC);
// Send refs down the wire.
ReceivePack rp = arc.getReceivePack();
rp.getAdvertiseRefsHook().advertiseRefs(rp);
ProjectState state = (ProjectState) request.getAttribute(ATT_STATE);
HttpServletResponseWithStatusWrapper responseWrapper =
new HttpServletResponseWithStatusWrapper((HttpServletResponse) response);
HttpServletRequest httpRequest = (HttpServletRequest) request;
Capable canUpload;
try {
try {
if (!permissionBackend
.currentUser()
.project(state.getNameKey())
.test(ProjectPermission.RUN_RECEIVE_PACK)) {
GitSmartHttpTools.sendError(
httpRequest,
responseWrapper,
HttpServletResponse.SC_FORBIDDEN,
"receive-pack not permitted on this server");
return;
}
canUpload = arc.canUpload();
} catch (PermissionBackendException e) {
throw new RuntimeException(e);
}
} finally {
groupAuditService.dispatch(
new HttpAuditEvent(
getSessionIdOrNull(sessionProvider),
userProvider.get(),
extractWhat(httpRequest),
TimeUtil.nowMs(),
extractParameters(httpRequest),
httpRequest.getMethod(),
httpRequest,
responseWrapper.getResponseStatus(),
responseWrapper));
}
if (canUpload != Capable.OK) {
GitSmartHttpTools.sendError(
httpRequest,
responseWrapper,
HttpServletResponse.SC_FORBIDDEN,
"\n" + canUpload.getMessage());
return;
}
if (!rp.isCheckReferencedObjectsAreReachable()) {
chain.doFilter(request, responseWrapper);
return;
}
if (!userProvider.get().isIdentifiedUser()) {
chain.doFilter(request, responseWrapper);
return;
}
AdvertisedObjectsCacheKey cacheKey =
AdvertisedObjectsCacheKey.create(userProvider.get().getAccountId(), state.getNameKey());
if (isGet) {
cache.invalidate(cacheKey);
} else {
Set ids = cache.getIfPresent(cacheKey);
if (ids != null) {
rp.getAdvertisedObjects().addAll(ids);
cache.invalidate(cacheKey);
}
}
chain.doFilter(request, responseWrapper);
if (isGet) {
cache.put(cacheKey, Collections.unmodifiableSet(new HashSet<>(rp.getAdvertisedObjects())));
}
}
@Override
public void init(FilterConfig arg0) {}
@Override
public void destroy() {}
}
private static String getSessionIdOrNull(Provider sessionProvider) {
WebSession session = sessionProvider.get();
if (session.isSignedIn()) {
return session.getSessionId();
}
return null;
}
}
