| ### |
| ### Untrusted_app_all. |
| ### |
| ### This file defines the rules shared by all untrusted app domains except |
| ### ephemeral_app for instant apps. |
| ### Apps are labeled based on mac_permissions.xml (maps signer and |
| ### optionally package name to seinfo value) and seapp_contexts (maps UID |
| ### and optionally seinfo value to domain for process and type for data |
| ### directory). The untrusted_app_all attribute is assigned to all default |
| ### seapp_contexts for any app with UID between APP_AID (10000) |
| ### and AID_ISOLATED_START (99000) if the app has no specific seinfo |
| ### value as determined from mac_permissions.xml. In current AOSP, this |
| ### attribute is assigned to all non-system apps as well as to any system apps |
| ### that are not signed by the platform key. To move |
| ### a system app into a specific domain, add a signer entry for it to |
| ### mac_permissions.xml and assign it one of the pre-existing seinfo values |
| ### or define and use a new seinfo value in both mac_permissions.xml and |
| ### seapp_contexts. |
| ### |
| ### Note that rules that should apply to all untrusted apps must be in app.te or also |
| ### added to ephemeral_app.te. |
| |
| # Some apps ship with shared libraries and binaries that they write out |
| # to their sandbox directory and then execute. |
| allow untrusted_app_all { app_data_file privapp_data_file }:file { rx_file_perms }; |
| |
| # ASEC |
| allow untrusted_app_all asec_apk_file:file r_file_perms; |
| allow untrusted_app_all asec_apk_file:dir r_dir_perms; |
| # Execute libs in asec containers. |
| allow untrusted_app_all asec_public_file:file { execute }; |
| |
| # Used by Finsky / Android "Verify Apps" functionality when |
| # running "adb install foo.apk". |
| # TODO: Long term, we don't want apps probing into shell data files. |
| # Figure out a way to remove these rules. |
| allow untrusted_app_all shell_data_file:file r_file_perms; |
| allow untrusted_app_all shell_data_file:dir r_dir_perms; |
| |
| # Allow traceur to pass file descriptors through a content provider to untrusted apps |
| # for the purpose of sharing files through e.g. gmail |
| allow untrusted_app_all trace_data_file:file { getattr read }; |
| |
| # untrusted apps should not be able to open trace data files, they should depend |
| # upon traceur to pass a file descriptor |
| neverallow untrusted_app_all trace_data_file:dir *; |
| neverallow untrusted_app_all trace_data_file:file { no_w_file_perms open }; |
| |
| # Allow to read staged apks. |
| allow untrusted_app_all { apk_tmp_file apk_private_tmp_file }:file {read getattr}; |
| |
| # Read and write system app data files passed over Binder. |
| # Motivating case was /data/data/com.android.settings/cache/*.jpg for |
| # cropping or taking user photos. |
| allow untrusted_app_all system_app_data_file:file { read write getattr }; |
| |
| # |
| # Rules migrated from old app domains coalesced into untrusted_app. |
| # This includes what used to be media_app, shared_app, and release_app. |
| # |
| |
| # Access to /data/media. |
| allow untrusted_app_all media_rw_data_file:dir create_dir_perms; |
| allow untrusted_app_all media_rw_data_file:file create_file_perms; |
| |
| # Traverse into /mnt/media_rw for bypassing FUSE daemon |
| # TODO: narrow this to just MediaProvider |
| allow untrusted_app_all mnt_media_rw_file:dir search; |
| |
| # allow cts to query all services |
| allow untrusted_app_all servicemanager:service_manager list; |
| |
| allow untrusted_app_all audioserver_service:service_manager find; |
| allow untrusted_app_all cameraserver_service:service_manager find; |
| allow untrusted_app_all drmserver_service:service_manager find; |
| allow untrusted_app_all mediaserver_service:service_manager find; |
| allow untrusted_app_all mediaextractor_service:service_manager find; |
| allow untrusted_app_all mediacodec_service:service_manager find; |
| allow untrusted_app_all mediametrics_service:service_manager find; |
| allow untrusted_app_all mediadrmserver_service:service_manager find; |
| allow untrusted_app_all nfc_service:service_manager find; |
| allow untrusted_app_all radio_service:service_manager find; |
| allow untrusted_app_all app_api_service:service_manager find; |
| allow untrusted_app_all vr_manager_service:service_manager find; |
| |
| # Allow GMS core to access perfprofd output, which is stored |
| # in /data/misc/perfprofd/. GMS core will need to list all |
| # data stored in that directory to process them one by one. |
| userdebug_or_eng(` |
| allow untrusted_app_all perfprofd_data_file:file r_file_perms; |
| allow untrusted_app_all perfprofd_data_file:dir r_dir_perms; |
| ') |
| |
| # gdbserver for ndk-gdb ptrace attaches to app process. |
| allow untrusted_app_all self:process ptrace; |
| |
| # Cts: HwRngTest |
| allow untrusted_app_all sysfs_hwrandom:dir search; |
| allow untrusted_app_all sysfs_hwrandom:file r_file_perms; |
| |
| # Allow apps to view preloaded media content |
| allow untrusted_app_all preloads_media_file:dir r_dir_perms; |
| allow untrusted_app_all preloads_media_file:file r_file_perms; |
| allow untrusted_app_all preloads_data_file:dir search; |
| |
| # Allow untrusted apps read / execute access to /vendor/app for there can |
| # be pre-installed vendor apps that package a library within themselves. |
| # TODO (b/37784178) Consider creating a special type for /vendor/app installed |
| # apps. |
| allow untrusted_app_all vendor_app_file:dir { open getattr read search }; |
| allow untrusted_app_all vendor_app_file:file { open getattr read execute }; |
| allow untrusted_app_all vendor_app_file:lnk_file { open getattr read }; |
| |
| # Write app-specific trace data to the Perfetto traced damon. This requires |
| # connecting to its producer socket and obtaining a (per-process) tmpfs fd. |
| allow untrusted_app_all traced:fd use; |
| allow untrusted_app_all traced_tmpfs:file { read write getattr map }; |
| unix_socket_connect(untrusted_app_all, traced_producer, traced) |
| |
| # allow untrusted apps to use UDP sockets provided by the system server but not |
| # modify them other than to connect |
| allow untrusted_app_all system_server:udp_socket { |
| connect getattr read recvfrom sendto write getopt setopt }; |
| |
| # This is allowed for targetSdkVersion <= 25 but disallowed on newer versions. |
| dontaudit untrusted_app_all net_dns_prop:file read; |
| |
| # These have been disallowed since Android O. |
| # For P, we assume that apps are safely handling the denial. |
| dontaudit untrusted_app_all proc_stat:file read; |
| dontaudit untrusted_app_all proc_vmstat:file read; |
| dontaudit untrusted_app_all proc_uptime:file read; |
| |
| # Allow the allocation and use of ptys |
| # Used by: https://play.google.com/store/apps/details?id=jackpal.androidterm |
| create_pty(untrusted_app_all) |
| |
| # /proc/net access. |
| # TODO(b/9496886) Audit access for removal. |
| # VPN apps require access to /proc/net/{tcp,udp} so access will need to be |
| # limited through a mechanism other than SELinux. |
| r_dir_file(untrusted_app_all, proc_net_type) |
| userdebug_or_eng(` |
| auditallow untrusted_app_all { |
| proc_net_type |
| -proc_net_vpn |
| }:{ dir file lnk_file } { getattr open read }; |
| ') |
| |
| # Attempts to write to system_data_file is generally a sign |
| # that apps are attempting to access encrypted storage before |
| # the ACTION_USER_UNLOCKED intent is delivered. Suppress this |
| # denial to prevent third party apps from spamming the logs. |
| dontaudit untrusted_app_all system_data_file:dir write; |