Migrate uid_granted_root to Rust

native/src/core/daemon.rs

@@ -41,6 +41,8 @@ impl BootStateFlags {
     }
 }
 
+pub const AID_ROOT: i32 = 0;
+pub const AID_SHELL: i32 = 2000;
 pub const AID_APP_START: i32 = 10000;
 pub const AID_APP_END: i32 = 19999;
 pub const AID_USER_OFFSET: i32 = 100000;
@@ -49,6 +51,10 @@ pub const fn to_app_id(uid: i32) -> i32 {
     uid % AID_USER_OFFSET
 }
 
+pub const fn to_user_id(uid: i32) -> i32 {
+    uid / AID_USER_OFFSET
+}
+
 #[derive(Default)]
 pub struct MagiskD {
     pub sql_connection: Mutex<Option<Sqlite3>>,

native/src/core/db.rs

@@ -25,14 +25,14 @@ fn sqlite_err_str(code: i32) -> &'static Utf8CStr {
 #[error("sqlite3: {}", sqlite_err_str(self.0))]
 pub struct SqliteError(i32);
 
-pub type SqliteResult = Result<(), SqliteError>;
+pub type SqliteResult<T> = Result<T, SqliteError>;
 
 pub trait SqliteReturn {
-    fn sql_result(self) -> SqliteResult;
+    fn sql_result(self) -> SqliteResult<()>;
 }
 
 impl SqliteReturn for i32 {
-    fn sql_result(self) -> SqliteResult {
+    fn sql_result(self) -> SqliteResult<()> {
         if self != 0 {
             Err(SqliteError(self))
         } else {
@@ -217,7 +217,7 @@ impl MagiskD {
         self.db_exec_impl(sql, args, None, ptr::null_mut())
     }
 
-    pub fn set_db_setting(&self, key: DbEntryKey, value: i32) -> SqliteResult {
+    pub fn set_db_setting(&self, key: DbEntryKey, value: i32) -> SqliteResult<()> {
         self.db_exec(
             "INSERT OR REPLACE INTO settings (key,value) VALUES(?,?)",
             &[Text(key.to_str()), Integer(value as i64)],
@@ -250,10 +250,12 @@ impl MagiskD {
         val
     }
 
-    pub fn get_db_settings(&self, cfg: &mut DbSettings) -> SqliteResult {
+    pub fn get_db_settings(&self) -> SqliteResult<DbSettings> {
+        let mut cfg = DbSettings::default();
         cfg.zygisk = self.is_emulator;
-        self.db_exec_with_rows("SELECT * FROM settings", &[], cfg)
-            .sql_result()
+        self.db_exec_with_rows("SELECT * FROM settings", &[], &mut cfg)
+            .sql_result()?;
+        Ok(cfg)
     }
 
     pub fn get_db_string(&self, key: DbEntryKey) -> String {
@@ -272,7 +274,7 @@ impl MagiskD {
         val
     }
 
-    pub fn rm_db_string(&self, key: DbEntryKey) -> SqliteResult {
+    pub fn rm_db_string(&self, key: DbEntryKey) -> SqliteResult<()> {
         self.db_exec("DELETE FROM strings WHERE key=?", &[Text(key.to_str())])
             .sql_result()
     }
@@ -301,7 +303,11 @@ impl MagiskD {
 
 impl MagiskD {
     pub fn get_db_settings_for_cxx(&self, cfg: &mut DbSettings) -> bool {
-        self.get_db_settings(cfg).log().is_ok()
+        cfg.zygisk = self.is_emulator;
+        self.db_exec_with_rows("SELECT * FROM settings", &[], cfg)
+            .sql_result()
+            .log()
+            .is_ok()
     }
 
     pub fn set_db_setting_for_cxx(&self, key: DbEntryKey, value: i32) -> bool {

native/src/core/include/core.hpp

@@ -53,7 +53,6 @@ void init_thread_pool();
 void exec_task(std::function<void()> &&task);
 
 // Daemon handlers
-void boot_stage_handler(int client, int code);
 void denylist_handler(int client, const sock_cred *cred);
 void su_daemon_handler(int client, const sock_cred *cred);
 void zygisk_handler(int client, const sock_cred *cred);

native/src/core/lib.rs

@@ -182,6 +182,7 @@ pub mod ffi {
         fn boot_stage_handler(&self, client: i32, code: i32);
         fn preserve_stub_apk(&self);
         fn prune_su_access(&self);
+        fn uid_granted_root(&self, mut uid: i32) -> bool;
         #[cxx_name = "get_manager"]
         unsafe fn get_manager_for_cxx(&self, user: i32, ptr: *mut CxxString, install: bool) -> i32;
 

native/src/core/su/mod.rs

@@ -1,7 +1,9 @@
-use crate::daemon::{to_app_id, MagiskD, AID_APP_END, AID_APP_START};
+use crate::daemon::{
+    to_app_id, to_user_id, MagiskD, AID_APP_END, AID_APP_START, AID_ROOT, AID_SHELL,
+};
 use crate::db::DbArg::Integer;
 use crate::db::{SqlTable, SqliteResult, SqliteReturn};
-use crate::ffi::{DbValues, RootSettings, SuPolicy};
+use crate::ffi::{DbValues, MultiuserMode, RootAccess, RootSettings, SuPolicy};
 use base::ResultExt;
 
 impl Default for SuPolicy {
@@ -44,7 +46,7 @@ impl SqlTable for UidList {
 }
 
 impl MagiskD {
-    fn get_root_settings(&self, uid: i32, settings: &mut RootSettings) -> SqliteResult {
+    fn get_root_settings(&self, uid: i32, settings: &mut RootSettings) -> SqliteResult<()> {
         self.db_exec_with_rows(
             "SELECT policy, logging, notification FROM policies \
              WHERE uid=? AND (until=0 OR until>strftime('%s', 'now'))",
@@ -87,6 +89,55 @@ impl MagiskD {
             self.db_exec("DELETE FROM policies WHERE uid=?", &[Integer(uid as i64)]);
         }
     }
+
+    pub fn uid_granted_root(&self, mut uid: i32) -> bool {
+        if uid == AID_ROOT {
+            return true;
+        }
+
+        let cfg = match self.get_db_settings().log() {
+            Ok(cfg) => cfg,
+            Err(_) => return false,
+        };
+
+        // Check user root access settings
+        match cfg.root_access {
+            RootAccess::Disabled => return false,
+            RootAccess::AppsOnly => {
+                if uid == AID_SHELL {
+                    return false;
+                }
+            }
+            RootAccess::AdbOnly => {
+                if uid != AID_SHELL {
+                    return false;
+                }
+            }
+            _ => {}
+        }
+
+        // Check multiuser settings
+        match cfg.multiuser_mode {
+            MultiuserMode::OwnerOnly => {
+                if to_user_id(uid) != 0 {
+                    return false;
+                }
+            }
+            MultiuserMode::OwnerManaged => uid = to_app_id(uid),
+            _ => {}
+        }
+
+        let mut granted = false;
+        let mut output_fn =
+            |_: &[String], values: &DbValues| granted = values.get_int(0) == SuPolicy::Allow.repr;
+        self.db_exec_with_rows(
+            "SELECT policy FROM policies WHERE uid=? AND (until=0 OR until>strftime('%s', 'now'))",
+            &[Integer(uid as i64)],
+            &mut output_fn,
+        );
+
+        granted
+    }
 }
 
 pub fn get_default_root_settings() -> RootSettings {

native/src/core/su/su_daemon.cpp

@@ -44,7 +44,8 @@ void su_info::refresh() {
 
 void su_info::check_db() {
     eval_uid = uid;
-    MagiskD().get_db_settings(cfg);
+    auto &daemon = MagiskD();
+    daemon.get_db_settings(cfg);
 
     // Check multiuser settings
     switch (cfg.multiuser_mode) {
@@ -63,59 +64,16 @@ void su_info::check_db() {
     }
 
     if (eval_uid > 0) {
-        if (!MagiskD().get_root_settings(eval_uid, access))
+        if (!daemon.get_root_settings(eval_uid, access))
             return;
     }
 
     // We need to check our manager
     if (access.policy == SuPolicy::Query || access.log || access.notify) {
-        mgr_uid = MagiskD().get_manager(to_user_id(eval_uid), &mgr_pkg, true);
+        mgr_uid = daemon.get_manager(to_user_id(eval_uid), &mgr_pkg, true);
     }
 }
 
-bool uid_granted_root(int uid) {
-    if (uid == AID_ROOT)
-        return true;
-
-    auto cfg = DbSettings();
-    MagiskD().get_db_settings(cfg);
-
-    // Check user root access settings
-    switch (cfg.root_access) {
-    case RootAccess::Disabled:
-        return false;
-    case RootAccess::AppsOnly:
-        if (uid == AID_SHELL)
-            return false;
-        break;
-    case RootAccess::AdbOnly:
-        if (uid != AID_SHELL)
-            return false;
-        break;
-    case RootAccess::AppsAndAdb:
-        break;
-    }
-
-    // Check multiuser settings
-    switch (cfg.multiuser_mode) {
-    case MultiuserMode::OwnerOnly:
-        if (to_user_id(uid) != 0)
-            return false;
-        break;
-    case MultiuserMode::OwnerManaged:
-        uid = to_app_id(uid);
-        break;
-    case MultiuserMode::User:
-    default:
-        break;
-    }
-
-    bool granted = false;
-    db_exec("SELECT policy FROM policies WHERE uid=? AND (until=0 OR until>strftime('%s', 'now'))",
-            { uid }, [&](auto, const DbValues &v) { granted = v.get_int(0) == +SuPolicy::Allow; });
-    return granted;
-}
-
 static shared_ptr<su_info> get_su_info(unsigned uid) {
     if (uid == AID_ROOT) {
         auto info = make_shared<su_info>(uid);

native/src/core/zygisk/entry.cpp

@@ -122,23 +122,23 @@ static void connect_companion(int client, bool is_64_bit) {
     send_fd(zygiskd_socket, client);
 }
 
-extern bool uid_granted_root(int uid);
 static void get_process_info(int client, const sock_cred *cred) {
     int uid = read_int(client);
     string process = read_string(client);
+    auto &daemon = MagiskD();
 
     uint32_t flags = 0;
 
     if (is_deny_target(uid, process)) {
         flags |= PROCESS_ON_DENYLIST;
     }
-    if (MagiskD().get_manager(to_user_id(uid), nullptr, false) == uid) {
+    if (daemon.get_manager(to_user_id(uid), nullptr, false) == uid) {
         flags |= PROCESS_IS_MAGISK_APP;
     }
     if (denylist_enforced) {
         flags |= DENYLIST_ENFORCING;
     }
-    if (uid_granted_root(uid)) {
+    if (daemon.uid_granted_root(uid)) {
         flags |= PROCESS_GRANTED_ROOT;
     }