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/ioctl.h>
20 #include <sys/mman.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
VhostDeviceVsockPolicy(const HostInfo & host)28 sandbox2::PolicyBuilder VhostDeviceVsockPolicy(const HostInfo& host) {
29 return BaselinePolicy(host, host.HostToolExe("vhost_device_vsock"))
30 .AddDirectory(host.vsock_device_dir, /* is_ro= */ false)
31 .AddPolicyOnMmap([](bpf_labels& labels) -> std::vector<sock_filter> {
32 return {
33 ARG_32(2), // prot
34 JNE32(PROT_READ | PROT_WRITE, JUMP(&labels, cf_webrtc_mmap_end)),
35 ARG_32(3), // flags
36 JEQ32(MAP_STACK | MAP_PRIVATE | MAP_ANONYMOUS, ALLOW),
37 JEQ32(MAP_NORESERVE | MAP_SHARED, ALLOW),
38 LABEL(&labels, cf_webrtc_mmap_end),
39 };
40 })
41 .AddPolicyOnSyscall(__NR_ioctl, {ARG_32(1), JEQ32(FIONBIO, ALLOW)})
42 .AddPolicyOnSyscall(__NR_socket, {ARG_32(0), JEQ32(AF_UNIX, ALLOW)})
43 .AllowDup()
44 .AllowEpoll()
45 .AllowEpollWait()
46 .AllowEventFd()
47 .AllowHandleSignals()
48 .AllowPrctlSetName()
49 .AllowSafeFcntl()
50 .AllowSyscall(__NR_accept4)
51 .AllowSyscall(__NR_bind)
52 .AllowSyscall(__NR_clone)
53 .AllowSyscall(__NR_connect)
54 .AllowSyscall(__NR_getrandom) // AllowGetRandom won't take GRND_INSECURE
55 .AllowSyscall(__NR_listen)
56 .AllowSyscall(__NR_recvfrom)
57 .AllowSyscall(__NR_recvmsg)
58 .AllowSyscall(__NR_sendmsg)
59 .AllowUnlink();
60 }
61
62 } // namespace cuttlefish::process_sandboxer
63