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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.sandbox;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.collect.ImmutableMap;
import com.google.common.io.ByteStreams;
import com.google.devtools.build.lib.shell.Command;
import com.google.devtools.build.lib.shell.CommandException;
import com.google.devtools.build.lib.shell.KillableObserver;
import com.google.devtools.build.lib.shell.TimeoutKillableObserver;
import com.google.devtools.build.lib.util.OS;
import com.google.devtools.build.lib.vfs.Path;
import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Helper class for running the namespace sandbox. This runner prepares environment inside the
* sandbox, handles sandbox output, performs cleanup and changes invocation if necessary.
*/
final class DarwinSandboxRunner extends SandboxRunner {
private static final String SANDBOX_EXEC = "/usr/bin/sandbox-exec";
private final Path sandboxExecRoot;
private final Path argumentsFilePath;
private final Set<Path> writableDirs;
private final Path runUnderPath;
DarwinSandboxRunner(
Path sandboxPath,
Path sandboxExecRoot,
Set<Path> writableDirs,
Path runUnderPath,
boolean verboseFailures) {
super(verboseFailures);
this.sandboxExecRoot = sandboxExecRoot;
this.argumentsFilePath = sandboxPath.getRelative("sandbox.sb");
this.writableDirs = writableDirs;
this.runUnderPath = runUnderPath;
}
static boolean isSupported() {
// Check osx version, only >=10.11 is supported.
// And we should check if sandbox still work when it gets 11.x
String osxVersion = OS.getVersion();
String[] parts = osxVersion.split("\\.");
if (parts.length < 2 || parts.length > 3) {
// Can be 10.xx or 10.xx.yy format
return false;
}
try {
int v0 = Integer.parseInt(parts[0]);
int v1 = Integer.parseInt(parts[1]);
if (v0 != 10 || v1 < 11) {
return false;
}
} catch (NumberFormatException e) {
return false;
}
List<String> args = new ArrayList<>();
args.add(SANDBOX_EXEC);
args.add("-p");
args.add("(version 1) (allow default)");
args.add("/usr/bin/true");
ImmutableMap<String, String> env = ImmutableMap.of();
File cwd = new File("/usr/bin");
Command cmd = new Command(args.toArray(new String[0]), env, cwd);
try {
cmd.execute(
/* stdin */ new byte[] {},
Command.NO_OBSERVER,
ByteStreams.nullOutputStream(),
ByteStreams.nullOutputStream(),
/* killSubprocessOnInterrupt */ true);
} catch (CommandException e) {
return false;
}
return true;
}
@Override
protected Command getCommand(
List<String> arguments,
Map<String, String> environment,
int timeout,
boolean allowNetwork,
boolean useFakeHostname,
boolean useFakeUsername)
throws IOException {
writeConfig(allowNetwork);
List<String> commandLineArgs = new ArrayList<>();
commandLineArgs.add(SANDBOX_EXEC);
commandLineArgs.add("-f");
commandLineArgs.add(argumentsFilePath.getPathString());
commandLineArgs.addAll(arguments);
return new Command(
commandLineArgs.toArray(new String[0]), environment, sandboxExecRoot.getPathFile());
}
private void writeConfig(boolean allowNetwork) throws IOException {
try (PrintWriter out =
new PrintWriter(
new BufferedWriter(
new OutputStreamWriter(argumentsFilePath.getOutputStream(), UTF_8)))) {
// Note: In Apple's sandbox configuration language, the *last* matching rule wins.
out.println("(version 1)");
out.println("(debug deny)");
out.println("(allow default)");
if (!allowNetwork) {
out.println("(deny network*)");
}
out.println("(allow network* (local ip \"localhost:*\"))");
out.println("(allow network* (remote ip \"localhost:*\"))");
if (runUnderPath != null) {
out.println("(allow file-read* (subpath \"" + runUnderPath + "\"))");
}
// Almost everything else is read-only.
out.println("(deny file-write* (subpath \"/\"))");
allowWriteSubpath(out, sandboxExecRoot);
for (Path path : writableDirs) {
allowWriteSubpath(out, path);
}
}
}
private void allowWriteSubpath(PrintWriter out, Path path) throws IOException {
out.println("(allow file-write* (subpath \"" + path.getPathString() + "\"))");
Path resolvedPath = path.resolveSymbolicLinks();
if (!resolvedPath.equals(path)) {
out.println("(allow file-write* (subpath \"" + resolvedPath.getPathString() + "\"))");
}
}
@Override
protected KillableObserver getCommandObserver(int timeout) {
return (timeout >= 0) ? new TimeoutKillableObserver(timeout * 1000) : Command.NO_OBSERVER;
}
@Override
protected int getSignalOnTimeout() {
return 15; /* SIGTERM */
}
}
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