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 <sys/mman.h>
20 #include <sys/socket.h>
21 #include <syscall.h>
22
23 #include <sandboxed_api/sandbox2/policybuilder.h>
24 #include <sandboxed_api/sandbox2/util/bpf_helper.h>
25
26 namespace cuttlefish::process_sandboxer {
27
ControlEnvProxyServerPolicy(const HostInfo & host)28 sandbox2::PolicyBuilder ControlEnvProxyServerPolicy(const HostInfo& host) {
29 return BaselinePolicy(host, host.HostToolExe("control_env_proxy_server"))
30 .AddDirectory(host.instance_uds_dir, /* is_ro= */ false)
31 .AddFile("/dev/urandom") // For gRPC
32 .AddPolicyOnSyscall(__NR_madvise,
33 {ARG_32(2), JEQ32(MADV_DONTNEED, ALLOW)})
34 .AddPolicyOnSyscall(__NR_socket, {ARG_32(0), JEQ32(AF_UNIX, ALLOW),
35 JEQ32(AF_INET, ERRNO(EACCES)),
36 JEQ32(AF_INET6, ERRNO(EACCES))})
37 .AddPolicyOnSyscalls(
38 {__NR_getsockopt, __NR_setsockopt},
39 [](bpf_labels& labels) -> std::vector<sock_filter> {
40 return {
41 ARG_32(1), // level
42 JNE32(SOL_SOCKET,
43 JUMP(&labels, cf_control_env_proxy_server_sockopt_end)),
44 ARG_32(2), // optname
45 JEQ32(SO_REUSEPORT, ALLOW),
46 LABEL(&labels, cf_control_env_proxy_server_sockopt_end),
47 };
48 })
49 .AllowChmod()
50 .AllowEventFd()
51 .AllowReaddir()
52 .AllowSafeFcntl()
53 .AllowSleep()
54 .AllowSyscall(__NR_accept)
55 .AllowSyscall(__NR_bind)
56 .AllowSyscall(__NR_clone) // Multi-threading
57 .AllowSyscall(__NR_connect)
58 .AllowSyscall(__NR_getpeername)
59 .AllowSyscall(__NR_getsockname)
60 .AllowSyscall(__NR_listen)
61 .AllowSyscall(__NR_recvmsg)
62 .AllowSyscall(__NR_shutdown)
63 .AllowSyscall(__NR_sendmsg)
64 .AllowSyscall(__NR_sched_getparam)
65 .AllowSyscall(__NR_sched_getscheduler)
66 .AllowSyscall(__NR_sched_yield);
67 }
68
69 } // namespace cuttlefish::process_sandboxer
70