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