1 /*
2 * Copyright (C) 2024 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "host/commands/process_sandboxer/policies.h"
18
19 #include <syscall.h>
20
21 #include <sandboxed_api/sandbox2/policybuilder.h>
22 #include <sandboxed_api/sandbox2/util/bpf_helper.h>
23
24 #include "host/commands/process_sandboxer/filesystem.h"
25
26 namespace cuttlefish::process_sandboxer {
27
ModemSimulatorPolicy(const HostInfo & host)28 sandbox2::PolicyBuilder ModemSimulatorPolicy(const HostInfo& host) {
29 return BaselinePolicy(host, host.HostToolExe("modem_simulator"))
30 .AddDirectory(JoinPath(host.host_artifacts_path, "/etc/modem_simulator"))
31 .AddDirectory(host.log_dir, /* is_ro= */ false)
32 .AddDirectory(host.runtime_dir, /* is_ro= */ false) // modem_nvram.json
33 .AddFile(host.cuttlefish_config_path)
34 .AddPolicyOnSyscall(
35 __NR_setsockopt,
36 [](bpf_labels& labels) -> std::vector<sock_filter> {
37 return {
38 ARG_32(1),
39 JNE32(SOL_SOCKET, JUMP(&labels, cf_setsockopt_end)),
40 ARG_32(2),
41 JEQ32(SO_REUSEADDR, ALLOW),
42 LABEL(&labels, cf_setsockopt_end),
43 };
44 })
45 .AddPolicyOnSyscall(__NR_socket, {ARG_32(0), JEQ32(AF_UNIX, ALLOW)})
46 .AllowHandleSignals()
47 .AllowPipe()
48 .AllowSafeFcntl()
49 .AllowSelect()
50 .AllowSyscall(__NR_accept)
51 .AllowSyscall(__NR_bind)
52 .AllowSyscall(__NR_clone) // multithreading
53 .AllowSyscall(__NR_listen)
54 .AllowTCGETS();
55 }
56
57 } // namespace cuttlefish::process_sandboxer
58