2234f9ff57
The current neverallow rule (compile time assertion)
neverallow { domain -gatekeeperd -system_server } gatekeeper_service:service_manager find;
asserts that no rule is present which allows processes other than
system_server from asking servicemanager for a gatekeeperd token.
However, if system_server leaks the token to other processes, it may
be possible for those processes to access gatekeeperd directly, bypassing
servicemanager.
Add a neverallow rule to assert that no process other than system_server
are allowed to make binder calls to gatekeeperd. Even if another process
was to manage to get a binder token to gatekeeperd, it would be useless.
Remove binder_service() from gatekeeperd. The original use of the
binder_service() macro was to widely publish a binder service.
If this macro is present and the calling process has a gatekeeperd
binder token, it's implicitly possible for the following processes
to make a binder call to gatekeeperd:
* all app processes
* dumpstate
* system_server
* mediaserver
* surfaceflinger
Removing binder_service revokes this implicit access.
Add explicit access for system_server to make binder calls to
gatekeeperd.
Add explicit access for gatekeeperd to make calls to keystore.
This was implicitly granted via binder_service() before, but now
needs to be explicit.
Change-Id: I23c1573d04ab670a42660d5922b39eecf4265b66
447 lines
16 KiB
Text
447 lines
16 KiB
Text
#
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# System Server aka system_server spawned by zygote.
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# Most of the framework services run in this process.
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#
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type system_server, domain, mlstrustedsubject;
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# Define a type for tmpfs-backed ashmem regions.
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tmpfs_domain(system_server)
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# Dalvik Compiler JIT Mapping.
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allow system_server self:process execmem;
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allow system_server ashmem_device:chr_file execute;
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allow system_server system_server_tmpfs:file execute;
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# For art.
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allow system_server dalvikcache_data_file:file execute;
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allow system_server dalvikcache_data_file:dir r_dir_perms;
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# /data/resource-cache
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allow system_server resourcecache_data_file:file r_file_perms;
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allow system_server resourcecache_data_file:dir r_dir_perms;
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# ptrace to processes in the same domain for debugging crashes.
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allow system_server self:process ptrace;
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# Child of the zygote.
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allow system_server zygote:fd use;
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allow system_server zygote:process sigchld;
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allow system_server zygote_tmpfs:file read;
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# May kill zygote on crashes.
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allow system_server zygote:process sigkill;
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# Read /system/bin/app_process.
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allow system_server zygote_exec:file r_file_perms;
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# Needed to close the zygote socket, which involves getopt / getattr
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allow system_server zygote:unix_stream_socket { getopt getattr };
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# system server gets network and bluetooth permissions.
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net_domain(system_server)
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bluetooth_domain(system_server)
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# These are the capabilities assigned by the zygote to the
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# system server.
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allow system_server self:capability {
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kill
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net_admin
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net_bind_service
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net_broadcast
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net_raw
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sys_boot
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sys_nice
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sys_resource
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sys_time
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sys_tty_config
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};
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wakelock_use(system_server)
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# Triggered by /proc/pid accesses, not allowed.
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dontaudit system_server self:capability sys_ptrace;
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# Trigger module auto-load.
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allow system_server kernel:system module_request;
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# Use netlink uevent sockets.
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allow system_server self:netlink_kobject_uevent_socket create_socket_perms;
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# Use generic netlink sockets.
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allow system_server self:netlink_socket create_socket_perms;
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# Set and get routes directly via netlink.
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allow system_server self:netlink_route_socket nlmsg_write;
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# Kill apps.
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allow system_server appdomain:process { sigkill signal };
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# Set scheduling info for apps.
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allow system_server appdomain:process { getsched setsched };
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allow system_server mediaserver:process { getsched setsched };
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# Read /proc/pid data for all domains. This is used by ProcessCpuTracker
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# within system_server to keep track of memory and CPU usage for
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# all processes on the device.
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r_dir_file(system_server, domain)
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# Read/Write to /proc/net/xt_qtaguid/ctrl and and /dev/xt_qtaguid.
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allow system_server qtaguid_proc:file rw_file_perms;
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allow system_server qtaguid_device:chr_file rw_file_perms;
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# Write to /proc/sysrq-trigger.
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allow system_server proc_sysrq:file rw_file_perms;
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# Read /sys/kernel/debug/wakeup_sources.
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allow system_server debugfs:file r_file_perms;
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# WifiWatchdog uses a packet_socket
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allow system_server self:packet_socket create_socket_perms;
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# 3rd party VPN clients require a tun_socket to be created
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allow system_server self:tun_socket create_socket_perms;
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# Notify init of death.
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allow system_server init:process sigchld;
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# Talk to init and various daemons via sockets.
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unix_socket_connect(system_server, property, init)
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unix_socket_connect(system_server, installd, installd)
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unix_socket_connect(system_server, lmkd, lmkd)
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unix_socket_connect(system_server, mtpd, mtp)
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unix_socket_connect(system_server, netd, netd)
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unix_socket_connect(system_server, vold, vold)
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unix_socket_connect(system_server, zygote, zygote)
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unix_socket_connect(system_server, gps, gpsd)
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unix_socket_connect(system_server, racoon, racoon)
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unix_socket_send(system_server, wpa, wpa)
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# Communicate over a socket created by surfaceflinger.
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allow system_server surfaceflinger:unix_stream_socket { read write setopt };
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# Perform Binder IPC.
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binder_use(system_server)
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binder_call(system_server, binderservicedomain)
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binder_call(system_server, gatekeeperd)
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binder_call(system_server, appdomain)
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binder_call(system_server, dumpstate)
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binder_service(system_server)
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# Ask debuggerd to dump backtraces for native stacks of interest.
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allow system_server { mediaserver sdcardd surfaceflinger inputflinger }:debuggerd dump_backtrace;
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# Read /proc/pid files for dumping stack traces of native processes.
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r_dir_file(system_server, mediaserver)
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r_dir_file(system_server, sdcardd)
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r_dir_file(system_server, surfaceflinger)
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r_dir_file(system_server, inputflinger)
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# Use sockets received over binder from various services.
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allow system_server mediaserver:tcp_socket rw_socket_perms;
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allow system_server mediaserver:udp_socket rw_socket_perms;
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# Check SELinux permissions.
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selinux_check_access(system_server)
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# XXX Label sysfs files with a specific type?
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allow system_server sysfs:file rw_file_perms;
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allow system_server sysfs_nfc_power_writable:file rw_file_perms;
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allow system_server sysfs_devices_system_cpu:file w_file_perms;
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# Access devices.
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allow system_server device:dir r_dir_perms;
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allow system_server mdns_socket:sock_file rw_file_perms;
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allow system_server alarm_device:chr_file rw_file_perms;
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allow system_server gpu_device:chr_file rw_file_perms;
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allow system_server iio_device:chr_file rw_file_perms;
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allow system_server input_device:dir r_dir_perms;
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allow system_server input_device:chr_file rw_file_perms;
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allow system_server radio_device:chr_file r_file_perms;
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allow system_server tty_device:chr_file rw_file_perms;
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allow system_server usbaccessory_device:chr_file rw_file_perms;
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allow system_server video_device:dir r_dir_perms;
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allow system_server video_device:chr_file rw_file_perms;
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allow system_server adbd_socket:sock_file rw_file_perms;
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allow system_server audio_device:dir r_dir_perms;
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allow system_server audio_device:chr_file r_file_perms;
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# tun device used for 3rd party vpn apps
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allow system_server tun_device:chr_file rw_file_perms;
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# Manage system data files.
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allow system_server system_data_file:dir create_dir_perms;
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allow system_server system_data_file:notdevfile_class_set create_file_perms;
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allow system_server keychain_data_file:dir create_dir_perms;
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allow system_server keychain_data_file:file create_file_perms;
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# Manage /data/app.
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allow system_server apk_data_file:dir create_dir_perms;
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allow system_server apk_data_file:file { create_file_perms link };
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allow system_server apk_tmp_file:dir create_dir_perms;
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allow system_server apk_tmp_file:file create_file_perms;
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# Manage /data/app-private.
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allow system_server apk_private_data_file:dir create_dir_perms;
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allow system_server apk_private_data_file:file create_file_perms;
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allow system_server apk_private_tmp_file:dir create_dir_perms;
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allow system_server apk_private_tmp_file:file create_file_perms;
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# Manage files within asec containers.
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allow system_server asec_apk_file:dir create_dir_perms;
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allow system_server asec_apk_file:file create_file_perms;
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allow system_server asec_public_file:file create_file_perms;
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# Manage /data/anr.
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allow system_server anr_data_file:dir create_dir_perms;
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allow system_server anr_data_file:file create_file_perms;
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# Manage /data/backup.
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allow system_server backup_data_file:dir create_dir_perms;
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allow system_server backup_data_file:file create_file_perms;
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# Read from /data/dalvik-cache/profiles
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allow system_server dalvikcache_profiles_data_file:dir rw_dir_perms;
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allow system_server dalvikcache_profiles_data_file:file create_file_perms;
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# Write to /data/system/heapdump
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allow system_server heapdump_data_file:dir rw_dir_perms;
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allow system_server heapdump_data_file:file create_file_perms;
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# Manage /data/misc/adb.
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allow system_server adb_keys_file:dir create_dir_perms;
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allow system_server adb_keys_file:file create_file_perms;
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# Manage /data/misc/sms.
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# TODO: Split into a separate type?
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allow system_server radio_data_file:dir create_dir_perms;
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allow system_server radio_data_file:file create_file_perms;
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# Manage /data/misc/systemkeys.
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allow system_server systemkeys_data_file:dir create_dir_perms;
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allow system_server systemkeys_data_file:file create_file_perms;
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# Access /data/tombstones.
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allow system_server tombstone_data_file:dir r_dir_perms;
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allow system_server tombstone_data_file:file r_file_perms;
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# Manage /data/misc/vpn.
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allow system_server vpn_data_file:dir create_dir_perms;
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allow system_server vpn_data_file:file create_file_perms;
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# Manage /data/misc/wifi.
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allow system_server wifi_data_file:dir create_dir_perms;
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allow system_server wifi_data_file:file create_file_perms;
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# Manage /data/misc/zoneinfo.
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allow system_server zoneinfo_data_file:dir create_dir_perms;
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allow system_server zoneinfo_data_file:file create_file_perms;
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# Walk /data/data subdirectories.
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# Types extracted from seapp_contexts type= fields.
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allow system_server { system_app_data_file bluetooth_data_file nfc_data_file radio_data_file shell_data_file app_data_file }:dir { getattr read search };
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# Also permit for unlabeled /data/data subdirectories and
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# for unlabeled asec containers on upgrades from 4.2.
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allow system_server unlabeled:dir r_dir_perms;
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# Read pkg.apk file before it has been relabeled by vold.
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allow system_server unlabeled:file r_file_perms;
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# Populate com.android.providers.settings/databases/settings.db.
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allow system_server system_app_data_file:dir create_dir_perms;
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allow system_server system_app_data_file:file create_file_perms;
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# Receive and use open app data files passed over binder IPC.
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# Types extracted from seapp_contexts type= fields.
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allow system_server { system_app_data_file bluetooth_data_file nfc_data_file radio_data_file shell_data_file app_data_file }:file { getattr read write };
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# Receive and use open /data/media files passed over binder IPC.
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allow system_server media_rw_data_file:file { getattr read write };
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# Read /file_contexts and /data/security/file_contexts
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security_access_policy(system_server)
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# Relabel apk files.
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allow system_server { apk_tmp_file apk_private_tmp_file }:{ dir file } { relabelfrom relabelto };
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allow system_server { apk_data_file apk_private_data_file }:{ dir file } { relabelfrom relabelto };
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# Relabel wallpaper.
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allow system_server system_data_file:file relabelfrom;
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allow system_server wallpaper_file:file relabelto;
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allow system_server wallpaper_file:file { rw_file_perms unlink };
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# Relabel /data/anr.
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allow system_server system_data_file:dir relabelfrom;
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allow system_server anr_data_file:dir relabelto;
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# Property Service write
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allow system_server system_prop:property_service set;
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allow system_server dhcp_prop:property_service set;
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allow system_server net_radio_prop:property_service set;
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allow system_server system_radio_prop:property_service set;
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allow system_server debug_prop:property_service set;
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allow system_server powerctl_prop:property_service set;
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allow system_server fingerprint_prop:property_service set;
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# ctl interface
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allow system_server ctl_default_prop:property_service set;
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allow system_server ctl_dhcp_pan_prop:property_service set;
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allow system_server ctl_bugreport_prop:property_service set;
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# Create a socket for receiving info from wpa.
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type_transition system_server wifi_data_file:sock_file system_wpa_socket;
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type_transition system_server wpa_socket:sock_file system_wpa_socket;
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allow system_server wpa_socket:dir rw_dir_perms;
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allow system_server system_wpa_socket:sock_file create_file_perms;
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# Remove sockets created by wpa_supplicant
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allow system_server wpa_socket:sock_file unlink;
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# Create a socket for connections from debuggerd.
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type_transition system_server system_data_file:sock_file system_ndebug_socket "ndebugsocket";
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allow system_server system_ndebug_socket:sock_file create_file_perms;
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# Manage cache files.
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allow system_server cache_file:dir { relabelfrom create_dir_perms };
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allow system_server cache_file:file { relabelfrom create_file_perms };
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# Run system programs, e.g. dexopt.
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allow system_server system_file:file x_file_perms;
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# LocationManager(e.g, GPS) needs to read and write
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# to uart driver and ctrl proc entry
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allow system_server gps_device:chr_file rw_file_perms;
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allow system_server gps_control:file rw_file_perms;
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# Allow system_server to use app-created sockets and pipes.
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allow system_server appdomain:{ tcp_socket udp_socket } { getattr getopt setopt read write shutdown };
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allow system_server appdomain:{ fifo_file unix_stream_socket } { getattr read write };
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# Allow abstract socket connection
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allow system_server rild:unix_stream_socket connectto;
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# BackupManagerService lets PMS create a data backup file
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allow system_server cache_backup_file:file create_file_perms;
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# Relabel /data/backup
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allow system_server backup_data_file:dir { relabelto relabelfrom };
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# Relabel /cache/.*\.{data|restore}
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allow system_server cache_backup_file:file { relabelto relabelfrom };
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# LocalTransport creates and relabels /cache/backup
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allow system_server cache_backup_file:dir { relabelto relabelfrom create_dir_perms };
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# Allow system to talk to usb device
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allow system_server usb_device:chr_file rw_file_perms;
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allow system_server usb_device:dir r_dir_perms;
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# Allow system to talk to sensors
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allow system_server sensors_device:chr_file rw_file_perms;
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# Read from HW RNG (needed by EntropyMixer).
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allow system_server hw_random_device:chr_file r_file_perms;
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# Read and delete files under /dev/fscklogs.
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r_dir_file(system_server, fscklogs)
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allow system_server fscklogs:dir { write remove_name };
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allow system_server fscklogs:file unlink;
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# For SELinuxPolicyInstallReceiver
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selinux_manage_policy(system_server)
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# logd access, system_server inherit logd write socket
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# (urge is to deprecate this long term)
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allow system_server zygote:unix_dgram_socket write;
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# Read from log daemon.
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read_logd(system_server)
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# Be consistent with DAC permissions. Allow system_server to write to
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# /sys/module/lowmemorykiller/parameters/adj
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# /sys/module/lowmemorykiller/parameters/minfree
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allow system_server sysfs_lowmemorykiller:file { getattr w_file_perms };
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# Read /sys/fs/pstore/console-ramoops
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# Don't worry about overly broad permissions for now, as there's
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# only one file in /sys/fs/pstore
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allow system_server pstorefs:dir r_dir_perms;
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allow system_server pstorefs:file r_file_perms;
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allow system_server drmserver_service:service_manager find;
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allow system_server healthd_service:service_manager find;
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allow system_server keystore_service:service_manager find;
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allow system_server gatekeeper_service:service_manager find;
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allow system_server mediaserver_service:service_manager find;
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allow system_server nfc_service:service_manager find;
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allow system_server radio_service:service_manager find;
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allow system_server system_server_service:service_manager { add find };
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allow system_server surfaceflinger_service:service_manager find;
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allow system_server keystore:keystore_key {
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test
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get
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insert
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delete
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exist
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saw
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reset
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password
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lock
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unlock
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zero
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sign
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verify
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grant
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duplicate
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clear_uid
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reset_uid
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sync_uid
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password_uid
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add_auth
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};
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# Allow system server to search and write to the persistent factory reset
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# protection partition. This block device does not get wiped in a factory reset.
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allow system_server block_device:dir search;
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allow system_server frp_block_device:blk_file rw_file_perms;
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# Clean up old cgroups
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allow system_server cgroup:dir { remove_name rmdir };
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# /oem access
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r_dir_file(system_server, oemfs)
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# Allow resolving per-user storage symlinks
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allow system_server { mnt_user_file storage_file }:dir { getattr search };
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allow system_server { mnt_user_file storage_file }:lnk_file { getattr read };
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# Allow statfs() on storage devices, which happens fast enough that
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# we shouldn't be killed during unsafe removal
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allow system_server sdcard_type:dir { getattr search };
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# Traverse into expanded storage
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allow system_server mnt_expand_file:dir r_dir_perms;
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###
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### Neverallow rules
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###
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### system_server should NEVER do any of this
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# Do not allow opening files from external storage as unsafe ejection
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# could cause the kernel to kill the system_server.
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neverallow system_server sdcard_type:dir { open read write };
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neverallow system_server sdcard_type:file rw_file_perms;
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# system server should never be opening zygote spawned app data
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# files directly. Rather, they should always be passed via a
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# file descriptor.
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# Types extracted from seapp_contexts type= fields, excluding
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# those types that system_server needs to open directly.
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neverallow system_server { bluetooth_data_file nfc_data_file shell_data_file app_data_file }:file open;
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# system_server should never be executing dex2oat. This is either
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# a bug (for example, bug 16317188), or represents an attempt by
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# system server to dynamically load a dex file, something we do not
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# want to allow.
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neverallow system_server dex2oat_exec:file no_x_file_perms;
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# The only block device system_server should be accessing is
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# the frp_block_device. This helps avoid a system_server to root
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# escalation by writing to raw block devices.
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neverallow system_server { dev_type -frp_block_device }:blk_file no_rw_file_perms;
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