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 <linux/filter.h>
20 #include <sys/mman.h>
21 #include <sys/socket.h>
22 #include <syscall.h>
23
24 #include <vector>
25
26 #include <sandboxed_api/sandbox2/policybuilder.h>
27 #include <sandboxed_api/sandbox2/util/bpf_helper.h>
28
29 namespace cuttlefish::process_sandboxer {
30
CasimirControlServerPolicy(const HostInfo & host)31 sandbox2::PolicyBuilder CasimirControlServerPolicy(const HostInfo& host) {
32 return BaselinePolicy(host, host.HostToolExe("casimir_control_server"))
33 .AddDirectory(host.EnvironmentsUdsDir(), /* is_ro= */ false)
34 .AddDirectory(host.InstanceUdsDir(), /* is_ro= */ false)
35 .AddFile("/dev/urandom") // For gRPC
36 .AddPolicyOnSyscall(__NR_madvise,
37 {ARG_32(2), JEQ32(MADV_DONTNEED, ALLOW)})
38 .AddPolicyOnSyscall(
39 __NR_socket, {ARG_32(0), JEQ32(AF_UNIX, ALLOW), JEQ32(AF_INET, ALLOW),
40 JEQ32(AF_INET6, ALLOW)})
41 .AddPolicyOnSyscalls(
42 {__NR_getsockopt, __NR_setsockopt},
43 [](bpf_labels& labels) -> std::vector<sock_filter> {
44 return {
45 ARG_32(1), // level
46 JNE32(SOL_SOCKET,
47 JUMP(&labels, cf_control_env_proxy_server_sockopt_end)),
48 ARG_32(2), // optname
49 JEQ32(SO_REUSEPORT, ALLOW),
50 LABEL(&labels, cf_control_env_proxy_server_sockopt_end),
51 };
52 })
53 .AllowEventFd()
54 .AllowSafeFcntl()
55 .AllowSleep()
56 .AllowSyscall(__NR_accept)
57 .AllowSyscall(__NR_bind)
58 .AllowSyscall(__NR_clone) // Multithreading
59 .AllowSyscall(__NR_connect)
60 .AllowSyscall(__NR_getpeername)
61 .AllowSyscall(__NR_getsockname)
62 .AllowSyscall(__NR_listen)
63 .AllowSyscall(__NR_recvmsg)
64 .AllowSyscall(__NR_sched_getparam)
65 .AllowSyscall(__NR_sched_getscheduler)
66 .AllowSyscall(__NR_sched_yield)
67 .AllowSyscall(__NR_sendmsg)
68 .AllowSyscall(__NR_shutdown)
69 .AllowTCGETS();
70 }
71
72 } // namespace cuttlefish::process_sandboxer
73