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// Copyright (C) 2018 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.server.restapi.project;
import static com.google.gerrit.entities.RefNames.REFS_HEADS;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;
import com.google.gerrit.entities.Account;
import com.google.gerrit.entities.BranchNameKey;
import com.google.gerrit.extensions.api.config.AccessCheckInfo;
import com.google.gerrit.extensions.api.config.AccessCheckInput;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.extensions.restapi.RestReadView;
import com.google.gerrit.server.account.AccountResolver;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.logging.TraceContext;
import com.google.gerrit.server.permissions.DefaultPermissionMappings;
import com.google.gerrit.server.permissions.GlobalPermission;
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.permissions.RefPermission;
import com.google.gerrit.server.project.ProjectResource;
import com.google.inject.Inject;
import java.io.IOException;
import java.util.Optional;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.lib.Repository;
import org.kohsuke.args4j.Option;
public class CheckAccess implements RestReadView {
private final AccountResolver accountResolver;
private final PermissionBackend permissionBackend;
private final GitRepositoryManager gitRepositoryManager;
@Inject
CheckAccess(
AccountResolver resolver,
PermissionBackend permissionBackend,
GitRepositoryManager gitRepositoryManager) {
this.accountResolver = resolver;
this.permissionBackend = permissionBackend;
this.gitRepositoryManager = gitRepositoryManager;
}
@Option(name = "--ref", usage = "ref name to check permission for")
String refName;
@Option(name = "--account", usage = "account to check acccess for")
String account;
@Option(name = "--perm", usage = "permission to check; default: read of any ref.")
String permission;
public Response apply(ProjectResource rsrc, AccessCheckInput input)
throws PermissionBackendException, RestApiException, IOException, ConfigInvalidException {
permissionBackend.user(rsrc.getUser()).check(GlobalPermission.VIEW_ACCESS);
rsrc.getProjectState().checkStatePermitsRead();
if (input == null) {
throw new BadRequestException("input is required");
}
if (Strings.isNullOrEmpty(input.account)) {
throw new BadRequestException("input requires 'account'");
}
try (TraceContext traceContext = TraceContext.open()) {
traceContext.enableAclLogging();
Account.Id match = accountResolver.resolve(input.account).asUnique().account().id();
try {
permissionBackend
.absentUser(match)
.project(rsrc.getNameKey())
.check(ProjectPermission.ACCESS);
} catch (AuthException e) {
return Response.ok(
createInfo(
HttpServletResponse.SC_FORBIDDEN,
String.format("user %s cannot see project %s", match, rsrc.getName())));
}
RefPermission refPerm;
if (!Strings.isNullOrEmpty(input.permission)) {
if (Strings.isNullOrEmpty(input.ref)) {
throw new BadRequestException("must set 'ref' when specifying 'permission'");
}
Optional rp = DefaultPermissionMappings.refPermission(input.permission);
if (!rp.isPresent()) {
throw new BadRequestException(
String.format("'%s' is not recognized as ref permission", input.permission));
}
refPerm = rp.get();
} else {
refPerm = RefPermission.READ;
}
String message = null;
if (!Strings.isNullOrEmpty(input.ref)) {
try {
permissionBackend
.absentUser(match)
.ref(BranchNameKey.create(rsrc.getNameKey(), input.ref))
.check(refPerm);
} catch (AuthException e) {
return Response.ok(
createInfo(
HttpServletResponse.SC_FORBIDDEN,
String.format(
"user %s lacks permission %s for %s in project %s",
match, input.permission, input.ref, rsrc.getName())));
}
} else {
// We say access is okay if there are no refs, but this warrants a warning,
// as access denied looks the same as no branches to the user.
try (Repository repo = gitRepositoryManager.openRepository(rsrc.getNameKey())) {
if (repo.getRefDatabase().getRefsByPrefix(REFS_HEADS).isEmpty()) {
message = "access is OK, but repository has no branches under refs/heads/";
}
}
}
return Response.ok(createInfo(HttpServletResponse.SC_OK, message));
}
}
private AccessCheckInfo createInfo(int statusCode, String message) {
AccessCheckInfo info = new AccessCheckInfo();
info.status = statusCode;
info.message = message;
info.debugLogs = TraceContext.getAclLogRecords();
if (info.debugLogs.isEmpty()) {
info.debugLogs =
ImmutableList.of("Found no rules that apply, so defaulting to no permission");
}
return info;
}
@Override
public Response apply(ProjectResource rsrc)
throws PermissionBackendException, RestApiException, IOException, ConfigInvalidException {
AccessCheckInput input = new AccessCheckInput();
input.ref = refName;
input.account = account;
input.permission = permission;
return apply(rsrc, input);
}
}
