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Update SELinux policy

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This commit is contained in:
vvb2060
2023-03-15 00:24:33 +08:00
committed by John Wu
parent c0c9204848
commit bc94ea4334
3 changed files with 10 additions and 97 deletions
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native/src/sepolicy/rules.cpp
+9 -86
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@@ -8,9 +8,6 @@ void sepolicy::magisk_rules() {
// Temp suppress warnings
set_log_level_state(LogLevel::Warn, false);
// This indicates API 26+
bool new_rules = exists("untrusted_app_25");
// Prevent anything to change sepolicy except ourselves
deny(ALL, "kernel", "security", "load_policy");
@@ -39,84 +36,15 @@ void sepolicy::magisk_rules() {
allow(ALL, SEPOL_FILE_TYPE, "lnk_file", ALL);
allow(ALL, SEPOL_FILE_TYPE, "sock_file", ALL);
if (new_rules) {
// Make client type literally untrusted_app
type(SEPOL_CLIENT_DOMAIN, "domain");
typeattribute(SEPOL_CLIENT_DOMAIN, "coredomain");
typeattribute(SEPOL_CLIENT_DOMAIN, "appdomain");
typeattribute(SEPOL_CLIENT_DOMAIN, "untrusted_app_all");
typeattribute(SEPOL_CLIENT_DOMAIN, "netdomain");
typeattribute(SEPOL_CLIENT_DOMAIN, "bluetoothdomain");
type(SEPOL_EXEC_TYPE, "file_type");
typeattribute(SEPOL_EXEC_TYPE, "exec_type");
// Basic su client needs
allow(SEPOL_CLIENT_DOMAIN, SEPOL_EXEC_TYPE, "file", ALL);
allow(SEPOL_CLIENT_DOMAIN, SEPOL_CLIENT_DOMAIN, ALL, ALL);
const char *pts[]{"devpts", "untrusted_app_devpts", "untrusted_app_25_devpts"};
for (auto type : pts) {
allow(SEPOL_CLIENT_DOMAIN, type, "chr_file", "getattr");
allow(SEPOL_CLIENT_DOMAIN, type, "chr_file", "read");
allow(SEPOL_CLIENT_DOMAIN, type, "chr_file", "write");
allow(SEPOL_CLIENT_DOMAIN, type, "chr_file", "ioctl");
}
// Allow these processes to access MagiskSU
vector<const char *> clients{ "shell", "update_engine", "appdomain" };
for (auto type : clients) {
if (!exists(type))
continue;
// exec magisk
allow(type, SEPOL_EXEC_TYPE, "file", "read");
allow(type, SEPOL_EXEC_TYPE, "file", "open");
allow(type, SEPOL_EXEC_TYPE, "file", "getattr");
allow(type, SEPOL_EXEC_TYPE, "file", "execute");
allow(SEPOL_CLIENT_DOMAIN, type, "process", "sigchld");
// Auto transit to client domain
allow(type, SEPOL_CLIENT_DOMAIN, "process", "transition");
dontaudit(type, SEPOL_CLIENT_DOMAIN, "process", "siginh");
dontaudit(type, SEPOL_CLIENT_DOMAIN, "process", "rlimitinh");
dontaudit(type, SEPOL_CLIENT_DOMAIN, "process", "noatsecure");
// Kill client process
allow(type, SEPOL_CLIENT_DOMAIN, "process", "signal");
}
// type transition require actual types, not attributes
const char *app_types[]{
"system_app", "priv_app", "platform_app", "untrusted_app", "untrusted_app_25",
"untrusted_app_27", "untrusted_app_29", "untrusted_app_30", "untrusted_app_32"};
clients.pop_back();
clients.insert(clients.end(), app_types, app_types + std::size(app_types));
for (auto type : clients) {
// Auto transit to client domain
type_transition(type, SEPOL_EXEC_TYPE, "process", SEPOL_CLIENT_DOMAIN);
}
// Allow system_server to manage magisk_client
allow("system_server", SEPOL_CLIENT_DOMAIN, "process", "getpgid");
allow("system_server", SEPOL_CLIENT_DOMAIN, "process", "sigkill");
// Don't allow pesky processes to monitor audit deny logs when poking magisk daemon socket
dontaudit(ALL, SEPOL_PROC_DOMAIN, "unix_stream_socket", ALL);
// Only allow client processes and zygote to connect to magisk daemon socket
allow(SEPOL_CLIENT_DOMAIN, SEPOL_PROC_DOMAIN, "unix_stream_socket", ALL);
allow("zygote", SEPOL_PROC_DOMAIN, "unix_stream_socket", ALL);
} else {
// Fallback to poking holes in sandbox as Android 4.3 to 7.1 set PR_SET_NO_NEW_PRIVS
// Allow these processes to access MagiskSU
const char *clients[] { "init", "shell", "appdomain", "zygote" };
for (auto type : clients) {
if (!exists(type))
continue;
allow(type, SEPOL_PROC_DOMAIN, "unix_stream_socket", "connectto");
allow(type, SEPOL_PROC_DOMAIN, "unix_stream_socket", "getopt");
}
// Allow these processes to access MagiskSU
const char *clients[]{"zygote", "shell",
"system_app", "platform_app", "priv_app",
"untrusted_app", "untrusted_app_all"};
for (auto type: clients) {
if (!exists(type))
continue;
allow(type, SEPOL_PROC_DOMAIN, "unix_stream_socket", "connectto");
allow(type, SEPOL_PROC_DOMAIN, "unix_stream_socket", "getopt");
}
// Let everyone access tmpfs files (for SAR sbin overlay)
@@ -137,10 +65,6 @@ void sepolicy::magisk_rules() {
// Let init run stuffs
allow("kernel", SEPOL_PROC_DOMAIN, "fd", "use");
allow("init", SEPOL_PROC_DOMAIN, "process", ALL);
allow("init", SEPOL_EXEC_TYPE, "file", "read");
allow("init", SEPOL_EXEC_TYPE, "file", "open");
allow("init", SEPOL_EXEC_TYPE, "file", "getattr");
allow("init", SEPOL_EXEC_TYPE, "file", "execute");
// suRights
allow("servicemanager", SEPOL_PROC_DOMAIN, "dir", "search");
@@ -187,7 +111,6 @@ void sepolicy::magisk_rules() {
// Shut llkd up
dontaudit("llkd", SEPOL_PROC_DOMAIN, "process", "ptrace");
dontaudit("llkd", SEPOL_CLIENT_DOMAIN, "process", "ptrace");
// Keep /data/adb/* context
deny("init", "adb_data_file", "dir", "search");