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// Copyright (C) 2013 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 com.google.gerrit.httpd.restapi.RestApiServlet.replyError;
import static javax.servlet.http.HttpServletResponse.SC_FORBIDDEN;
import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.extensions.registration.DynamicItem;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.account.AccountResolver;
import com.google.gerrit.server.config.AuthConfig;
import com.google.gerrit.server.permissions.GlobalPermission;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.inject.servlet.ServletModule;
import java.io.IOException;
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 org.eclipse.jgit.errors.ConfigInvalidException;
/** Allows running a request as another user account. */
@Singleton
class RunAsFilter implements Filter {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private static final String RUN_AS = "X-Gerrit-RunAs";
static class Module extends ServletModule {
@Override
protected void configureServlets() {
filter("/*").through(RunAsFilter.class);
}
}
private final boolean enabled;
private final DynamicItem<WebSession> session;
private final PermissionBackend permissionBackend;
private final AccountResolver accountResolver;
@Inject
RunAsFilter(
AuthConfig config,
DynamicItem<WebSession> session,
PermissionBackend permissionBackend,
AccountResolver accountResolver) {
this.enabled = config.isRunAsEnabled();
this.session = session;
this.permissionBackend = permissionBackend;
this.accountResolver = accountResolver;
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
String runas = req.getHeader(RUN_AS);
if (runas != null) {
if (!enabled) {
replyError(req, res, SC_FORBIDDEN, RUN_AS + " disabled by auth.enableRunAs = false", null);
return;
}
CurrentUser self = session.get().getUser();
try {
if (!self.isIdentifiedUser()) {
// Always disallow for anonymous users, even if permitted by the ACL,
// because that would be crazy.
throw new AuthException("denied");
}
permissionBackend.user(self).check(GlobalPermission.RUN_AS);
} catch (AuthException e) {
replyError(req, res, SC_FORBIDDEN, "not permitted to use " + RUN_AS, null);
return;
} catch (PermissionBackendException e) {
logger.atWarning().withCause(e).log("cannot check runAs");
replyError(req, res, SC_INTERNAL_SERVER_ERROR, RUN_AS + " unavailable", null);
return;
}
Account target;
try {
target = accountResolver.find(runas);
} catch (OrmException | IOException | ConfigInvalidException e) {
logger.atWarning().withCause(e).log("cannot resolve account for %s", RUN_AS);
replyError(req, res, SC_INTERNAL_SERVER_ERROR, "cannot resolve " + RUN_AS, e);
return;
}
if (target == null) {
replyError(req, res, SC_FORBIDDEN, "no account matches " + RUN_AS, null);
return;
}
session.get().setUserAccountId(target.getId());
}
chain.doFilter(req, res);
}
@Override
public void init(FilterConfig filterConfig) {}
@Override
public void destroy() {}
}
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