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/ip_icmp.h>
20 #include <netinet/tcp.h>
21 #include <sys/mman.h>
22 #include <sys/prctl.h>
23 #include <sys/syscall.h>
24
25 #include <sandboxed_api/sandbox2/allow_unrestricted_networking.h>
26 #include <sandboxed_api/sandbox2/policybuilder.h>
27 #include <sandboxed_api/sandbox2/util/bpf_helper.h>
28
29 #include "host/commands/process_sandboxer/filesystem.h"
30
31 namespace cuttlefish::process_sandboxer {
32
WebRtcOperatorPolicy(const HostInfo & host)33 sandbox2::PolicyBuilder WebRtcOperatorPolicy(const HostInfo& host) {
34 return BaselinePolicy(host, host.HostToolExe("webrtc_operator"))
35 .AddDirectory(host.log_dir, /* is_ro= */ false)
36 .AddDirectory(
37 JoinPath(host.host_artifacts_path, "usr", "share", "webrtc"))
38 .AddFile("/dev/urandom") // For libwebsockets
39 .AddFile(host.cuttlefish_config_path)
40 .AllowEventFd()
41 .AllowHandleSignals()
42 .AddPolicyOnSyscall(
43 __NR_madvise,
44 {ARG_32(2), JEQ32(MADV_WIPEONFORK, ALLOW), JEQ32(0xffffffff, ALLOW)})
45 .AddPolicyOnSyscall(__NR_prctl,
46 {ARG_32(0), JEQ32(PR_CAPBSET_READ, ALLOW)})
47 .AddPolicyOnSyscall(__NR_socket, {ARG_32(0), JEQ32(AF_INET, ALLOW)})
48 .AddPolicyOnSyscall(
49 __NR_setsockopt,
50 [](bpf_labels& labels) -> std::vector<sock_filter> {
51 return {ARG_32(1), // level
52 JEQ32(IPPROTO_ICMP,
53 JUMP(&labels, cf_webrtc_operator_setsockopt_icmp)),
54 JNE32(IPPROTO_TCP,
55 JUMP(&labels, cf_webrtc_operator_setsockopt_end)),
56 // IPPROTO_TCP
57 ARG_32(2), // optname
58 JEQ32(TCP_NODELAY, ALLOW),
59 JUMP(&labels, cf_webrtc_operator_setsockopt_end),
60 // IPPROTO_ICMP
61 LABEL(&labels, cf_webrtc_operator_setsockopt_icmp),
62 ARG_32(2), // optname
63 JEQ32(ICMP_REDIR_NETTOS, ALLOW),
64 LABEL(&labels, cf_webrtc_operator_setsockopt_end)};
65 })
66 .Allow(sandbox2::UnrestrictedNetworking())
67 .AllowSafeFcntl()
68 .AllowSyscall(__NR_accept)
69 .AllowSyscall(__NR_bind)
70 .AllowSyscall(__NR_getpeername)
71 .AllowSyscall(__NR_getsockname)
72 .AllowSyscall(__NR_listen)
73 .AllowTCGETS();
74 }
75
76 } // namespace cuttlefish::process_sandboxer
77