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 <netinet/tcp.h>
20 #include <sys/mman.h>
21 #include <sys/socket.h>
22 #include <syscall.h>
23
24 #include <sandboxed_api/sandbox2/allow_unrestricted_networking.h>
25 #include <sandboxed_api/sandbox2/policybuilder.h>
26 #include <sandboxed_api/sandbox2/util/bpf_helper.h>
27
28 namespace cuttlefish::process_sandboxer {
29
OpenWrtControlServerPolicy(const HostInfo & host)30 sandbox2::PolicyBuilder OpenWrtControlServerPolicy(const HostInfo& host) {
31 return BaselinePolicy(host, host.HostToolExe("openwrt_control_server"))
32 .AddDirectory(host.instance_uds_dir, /* is_ro= */ false)
33 .AddDirectory(host.log_dir)
34 .AddFile("/dev/urandom") // For gRPC
35 .AddPolicyOnSyscall(__NR_madvise,
36 {ARG_32(2), JEQ32(MADV_DONTNEED, ALLOW)})
37 .AddPolicyOnSyscall(
38 __NR_socket, {ARG_32(0), JEQ32(AF_UNIX, ALLOW), JEQ32(AF_INET, ALLOW),
39 JEQ32(AF_INET6, ALLOW)})
40 .AddPolicyOnSyscalls(
41 {__NR_getsockopt, __NR_setsockopt},
42 [](bpf_labels& labels) -> std::vector<sock_filter> {
43 return {
44 ARG_32(1), // level
45 JEQ32(IPPROTO_TCP,
46 JUMP(&labels, cf_open_wrt_control_server_sockopt_ip)),
47 JNE32(SOL_SOCKET,
48 JUMP(&labels, cf_open_wrt_control_server_sockopt_end)),
49 // SOL_SOCKET
50 ARG_32(2), // optname
51 JEQ32(SO_ERROR, ALLOW),
52 JEQ32(SO_REUSEPORT, ALLOW),
53 JUMP(&labels, cf_open_wrt_control_server_sockopt_end),
54 // IPPROTO_TCP
55 LABEL(&labels, cf_open_wrt_control_server_sockopt_ip),
56 ARG_32(2), // optname
57 JEQ32(TCP_NODELAY, ALLOW),
58 LABEL(&labels, cf_open_wrt_control_server_sockopt_end),
59 };
60 })
61 .Allow(sandbox2::UnrestrictedNetworking()) // HTTP calls to luci
62 .AllowEventFd()
63 .AllowSafeFcntl()
64 .AllowHandleSignals()
65 .AllowPipe()
66 .AllowSleep()
67 .AllowSyscall(__NR_accept)
68 .AllowSyscall(__NR_bind)
69 .AllowSyscall(__NR_clone) // Multithreading
70 .AllowSyscall(__NR_connect)
71 .AllowSyscall(__NR_getpeername)
72 .AllowSyscall(__NR_getsockname)
73 .AllowSyscall(__NR_listen)
74 .AllowSyscall(__NR_recvfrom)
75 .AllowSyscall(__NR_recvmsg)
76 .AllowSyscall(__NR_sched_getparam)
77 .AllowSyscall(__NR_sched_getscheduler)
78 .AllowSyscall(__NR_sched_yield)
79 .AllowSyscall(__NR_sendmsg)
80 .AllowSyscall(__NR_sendto)
81 .AllowSyscall(__NR_shutdown);
82 }
83
84 } // namespace cuttlefish::process_sandboxer
85