mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-12-23 00:17:42 +00:00
003e44fb84
We used to construct /sbin tmpfs overlay in early-init stage after SELinux is properly initialized. However the way it is implemented (forking daemon from magiskinit with complicated file waiting triggers) is extremely complicated and error prone. This commit moves the construction of the sbin overlay to pre-init stage. The catch is that since SELinux is not present at that point, proper selabel has to be reconstructed afterwards. Some additional SEPolicy rules are added to make sure init can access magisk binaries, and the secontext relabeling task is assigned to the main Magisk daemon.
196 lines
8.1 KiB
C++
196 lines
8.1 KiB
C++
#include <magisk.h>
|
|
|
|
#include "magiskpolicy.h"
|
|
#include "sepolicy.h"
|
|
|
|
static void allowSuClient(const char *target) {
|
|
if (!sepol_exists(target))
|
|
return;
|
|
sepol_allow(target, SEPOL_PROC_DOMAIN, "unix_stream_socket", "connectto");
|
|
sepol_allow(target, SEPOL_PROC_DOMAIN, "unix_stream_socket", "getopt");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, target, "fd", "use");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, target, "fifo_file", ALL);
|
|
|
|
// Allow binder service
|
|
sepol_allow(target, SEPOL_PROC_DOMAIN, "binder", "call");
|
|
sepol_allow(target, SEPOL_PROC_DOMAIN, "binder", "transfer");
|
|
|
|
// Allow termios ioctl
|
|
sepol_allow(target, "devpts", "chr_file", "ioctl");
|
|
sepol_allow(target, "untrusted_app_devpts", "chr_file", "ioctl");
|
|
sepol_allow(target, "untrusted_app_25_devpts", "chr_file", "ioctl");
|
|
sepol_allow(target, "untrusted_app_all_devpts", "chr_file", "ioctl");
|
|
if (policydb->policyvers >= POLICYDB_VERSION_XPERMS_IOCTL) {
|
|
sepol_allowxperm(target, "devpts", "chr_file", "0x5400-0x54FF");
|
|
sepol_allowxperm(target, "untrusted_app_devpts", "chr_file", "0x5400-0x54FF");
|
|
sepol_allowxperm(target, "untrusted_app_25_devpts", "chr_file", "0x5400-0x54FF");
|
|
sepol_allowxperm(target, "untrusted_app_all_devpts", "chr_file", "0x5400-0x54FF");
|
|
}
|
|
}
|
|
|
|
void sepol_magisk_rules() {
|
|
// Temp suppress warnings
|
|
auto bak = log_cb.w;
|
|
log_cb.w = nop_log;
|
|
|
|
// First prevent anything to change sepolicy except ourselves
|
|
sepol_deny(ALL, "kernel", "security", "load_policy");
|
|
|
|
if (!sepol_exists(SEPOL_PROC_DOMAIN))
|
|
sepol_create(SEPOL_PROC_DOMAIN);
|
|
if (!sepol_exists(SEPOL_FILE_DOMAIN))
|
|
sepol_create(SEPOL_FILE_DOMAIN);
|
|
sepol_permissive(SEPOL_PROC_DOMAIN);
|
|
|
|
sepol_attradd(SEPOL_PROC_DOMAIN, "mlstrustedsubject");
|
|
sepol_attradd(SEPOL_PROC_DOMAIN, "netdomain");
|
|
sepol_attradd(SEPOL_PROC_DOMAIN, "bluetoothdomain");
|
|
sepol_attradd(SEPOL_FILE_DOMAIN, "mlstrustedobject");
|
|
|
|
// Let init daemon transit context
|
|
sepol_allow("kernel", "kernel", "process", "setcurrent");
|
|
sepol_allow("kernel", SEPOL_PROC_DOMAIN, "process", "dyntransition");
|
|
|
|
// Let init run stuffs
|
|
sepol_allow("kernel", SEPOL_PROC_DOMAIN, "fd", "use");
|
|
sepol_allow("init", SEPOL_PROC_DOMAIN, "process", ALL);
|
|
sepol_allow("init", "tmpfs", "file", "getattr");
|
|
sepol_allow("init", "tmpfs", "file", "execute");
|
|
|
|
// Shell, properties, logs
|
|
if (sepol_exists("default_prop"))
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "default_prop", "property_service", "set");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "init", "unix_stream_socket", "connectto");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "rootfs", "filesystem", "remount");
|
|
if (sepol_exists("logd"))
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "logd", "unix_stream_socket", "connectto");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, SEPOL_PROC_DOMAIN, ALL, ALL);
|
|
|
|
// For sepolicy live patching
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "kernel", "security", "read_policy");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "kernel", "security", "load_policy");
|
|
|
|
// Allow these processes to access MagiskSU
|
|
allowSuClient("init");
|
|
allowSuClient("shell");
|
|
allowSuClient("system_app");
|
|
allowSuClient("priv_app");
|
|
allowSuClient("platform_app");
|
|
allowSuClient("untrusted_app");
|
|
allowSuClient("untrusted_app_25");
|
|
allowSuClient("untrusted_app_27");
|
|
allowSuClient("update_engine");
|
|
|
|
// suRights
|
|
sepol_allow("servicemanager", SEPOL_PROC_DOMAIN, "dir", "search");
|
|
sepol_allow("servicemanager", SEPOL_PROC_DOMAIN, "dir", "read");
|
|
sepol_allow("servicemanager", SEPOL_PROC_DOMAIN, "file", "open");
|
|
sepol_allow("servicemanager", SEPOL_PROC_DOMAIN, "file", "read");
|
|
sepol_allow("servicemanager", SEPOL_PROC_DOMAIN, "process", "getattr");
|
|
sepol_allow("servicemanager", SEPOL_PROC_DOMAIN, "binder", "transfer");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "servicemanager", "dir", "search");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "servicemanager", "dir", "read");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "servicemanager", "file", "open");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "servicemanager", "file", "read");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "servicemanager", "process", "getattr");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "servicemanager", "binder", "transfer");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "servicemanager", "binder", "call");
|
|
sepol_allow(ALL, SEPOL_PROC_DOMAIN, "process", "sigchld");
|
|
|
|
// allowLog
|
|
sepol_allow("logd", SEPOL_PROC_DOMAIN, "dir", "search");
|
|
sepol_allow("logd", SEPOL_PROC_DOMAIN, "file", "read");
|
|
sepol_allow("logd", SEPOL_PROC_DOMAIN, "file", "open");
|
|
sepol_allow("logd", SEPOL_PROC_DOMAIN, "file", "getattr");
|
|
|
|
// suBackL0
|
|
sepol_allow("system_server", SEPOL_PROC_DOMAIN, "binder", "call");
|
|
sepol_allow("system_server", SEPOL_PROC_DOMAIN, "binder", "transfer");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "system_server", "binder", "call");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "system_server", "binder", "transfer");
|
|
|
|
// suBackL6
|
|
sepol_allow("surfaceflinger", "app_data_file", "dir", ALL);
|
|
sepol_allow("surfaceflinger", "app_data_file", "file", ALL);
|
|
sepol_allow("surfaceflinger", "app_data_file", "lnk_file", ALL);
|
|
sepol_attradd("surfaceflinger", "mlstrustedsubject");
|
|
|
|
// suMiscL6
|
|
if (sepol_exists("audioserver"))
|
|
sepol_allow("audioserver", "audioserver", "process", "execmem");
|
|
|
|
// Liveboot
|
|
sepol_allow("surfaceflinger", SEPOL_PROC_DOMAIN, "process", "ptrace");
|
|
sepol_allow("surfaceflinger", SEPOL_PROC_DOMAIN, "binder", "transfer");
|
|
sepol_allow("surfaceflinger", SEPOL_PROC_DOMAIN, "binder", "call");
|
|
sepol_allow("surfaceflinger", SEPOL_PROC_DOMAIN, "fd", "use");
|
|
sepol_allow("debuggerd", SEPOL_PROC_DOMAIN, "process", "ptrace");
|
|
|
|
// dumpsys
|
|
sepol_allow(ALL, SEPOL_PROC_DOMAIN, "fd", "use");
|
|
sepol_allow(ALL, SEPOL_PROC_DOMAIN, "fifo_file", "write");
|
|
sepol_allow(ALL, SEPOL_PROC_DOMAIN, "fifo_file", "read");
|
|
sepol_allow(ALL, SEPOL_PROC_DOMAIN, "fifo_file", "open");
|
|
sepol_allow(ALL, SEPOL_PROC_DOMAIN, "fifo_file", "getattr");
|
|
|
|
// bootctl
|
|
sepol_allow("hwservicemanager", SEPOL_PROC_DOMAIN, "dir", "search");
|
|
sepol_allow("hwservicemanager", SEPOL_PROC_DOMAIN, "file", "read");
|
|
sepol_allow("hwservicemanager", SEPOL_PROC_DOMAIN, "file", "open");
|
|
sepol_allow("hwservicemanager", SEPOL_PROC_DOMAIN, "process", "getattr");
|
|
sepol_allow("hwservicemanager", SEPOL_PROC_DOMAIN, "binder", "transfer");
|
|
|
|
// For mounting loop devices, mirrors, tmpfs
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "kernel", "process", "setsched");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "labeledfs", "filesystem", "mount");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "labeledfs", "filesystem", "unmount");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "tmpfs", "filesystem", "mount");
|
|
sepol_allow(SEPOL_PROC_DOMAIN, "tmpfs", "filesystem", "unmount");
|
|
sepol_allow("kernel", ALL, "file", "read");
|
|
|
|
// Allow su to do anything to any files/dir/links
|
|
sepol_allow(SEPOL_PROC_DOMAIN, ALL, "file", ALL);
|
|
sepol_allow(SEPOL_PROC_DOMAIN, ALL, "dir", ALL);
|
|
sepol_allow(SEPOL_PROC_DOMAIN, ALL, "lnk_file", ALL);
|
|
sepol_allow(SEPOL_PROC_DOMAIN, ALL, "blk_file", ALL);
|
|
sepol_allow(SEPOL_PROC_DOMAIN, ALL, "sock_file", ALL);
|
|
sepol_allow(SEPOL_PROC_DOMAIN, ALL, "chr_file", ALL);
|
|
sepol_allow(SEPOL_PROC_DOMAIN, ALL, "fifo_file", ALL);
|
|
|
|
// Allow all binder transactions
|
|
sepol_allow(ALL, SEPOL_PROC_DOMAIN, "binder", ALL);
|
|
|
|
// Super files
|
|
sepol_allow(ALL, SEPOL_FILE_DOMAIN, "file", ALL);
|
|
sepol_allow(ALL, SEPOL_FILE_DOMAIN, "dir", ALL);
|
|
sepol_allow(ALL, SEPOL_FILE_DOMAIN, "fifo_file", ALL);
|
|
sepol_allow(ALL, SEPOL_FILE_DOMAIN, "chr_file", ALL);
|
|
sepol_allow(SEPOL_FILE_DOMAIN, ALL, "filesystem", "associate");
|
|
|
|
// For changing attributes
|
|
sepol_allow("rootfs", "tmpfs", "filesystem", "associate");
|
|
|
|
// Xposed
|
|
sepol_allow("untrusted_app", "untrusted_app", "capability", "setgid");
|
|
sepol_allow("system_server", "dex2oat_exec", "file", ALL);
|
|
|
|
// Support deodexed ROM on Oreo
|
|
sepol_allow("zygote", "dalvikcache_data_file", "file", "execute");
|
|
|
|
// Support deodexed ROM on Pie (Samsung)
|
|
sepol_allow("system_server", "dalvikcache_data_file", "file", "write");
|
|
sepol_allow("system_server", "dalvikcache_data_file", "file", "execute");
|
|
|
|
// Allow update engine to source addon.d.sh
|
|
sepol_allow("update_engine", "adb_data_file", "dir", ALL);
|
|
|
|
// Remove all dontaudit
|
|
avtab_ptr_t av;
|
|
avtab_for_each(&policydb->te_avtab, av, {
|
|
if (av->key.specified == AVTAB_AUDITDENY || av->key.specified == AVTAB_XPERMS_DONTAUDIT)
|
|
avtab_remove_node(&policydb->te_avtab, av);
|
|
})
|
|
|
|
log_cb.w = bak;
|
|
}
|