1### 2### Untrusted_app_all. 3### 4### This file defines the rules shared by all untrusted app domains except 5### apps which target the v2 security sandbox (ephemeral_app for instant apps, 6### untrusted_v2_app for fully installed v2 apps). 7### Apps are labeled based on mac_permissions.xml (maps signer and 8### optionally package name to seinfo value) and seapp_contexts (maps UID 9### and optionally seinfo value to domain for process and type for data 10### directory). The untrusted_app_all attribute is assigned to all default 11### seapp_contexts for any app with UID between APP_AID (10000) 12### and AID_ISOLATED_START (99000) if the app has no specific seinfo 13### value as determined from mac_permissions.xml. In current AOSP, this 14### attribute is assigned to all non-system apps as well as to any system apps 15### that are not signed by the platform key. To move 16### a system app into a specific domain, add a signer entry for it to 17### mac_permissions.xml and assign it one of the pre-existing seinfo values 18### or define and use a new seinfo value in both mac_permissions.xml and 19### seapp_contexts. 20### 21### Note that rules that should apply to all untrusted apps must be in app.te or also 22### added to untrusted_v2_app.te and ephemeral_app.te. 23 24# Legacy text relocations 25allow untrusted_app_all apk_data_file:file execmod; 26 27# Some apps ship with shared libraries and binaries that they write out 28# to their sandbox directory and then execute. 29allow untrusted_app_all app_data_file:file { rx_file_perms execmod }; 30 31# ASEC 32allow untrusted_app_all asec_apk_file:file r_file_perms; 33allow untrusted_app_all asec_apk_file:dir r_dir_perms; 34# Execute libs in asec containers. 35allow untrusted_app_all asec_public_file:file { execute execmod }; 36 37# Used by Finsky / Android "Verify Apps" functionality when 38# running "adb install foo.apk". 39# TODO: Long term, we don't want apps probing into shell data files. 40# Figure out a way to remove these rules. 41allow untrusted_app_all shell_data_file:file r_file_perms; 42allow untrusted_app_all shell_data_file:dir r_dir_perms; 43 44# Allow traceur to pass file descriptors through a content provider to untrusted apps 45# for the purpose of sharing files through e.g. gmail 46allow untrusted_app_all trace_data_file:file { getattr read }; 47 48# untrusted apps should not be able to open trace data files, they should depend 49# upon traceur to pass a file descriptor 50neverallow untrusted_app_all trace_data_file:dir *; 51neverallow untrusted_app_all trace_data_file:file { no_w_file_perms open }; 52 53# Allow to read staged apks. 54allow untrusted_app_all { apk_tmp_file apk_private_tmp_file }:file {read getattr}; 55 56# Read and write system app data files passed over Binder. 57# Motivating case was /data/data/com.android.settings/cache/*.jpg for 58# cropping or taking user photos. 59allow untrusted_app_all system_app_data_file:file { read write getattr }; 60 61# 62# Rules migrated from old app domains coalesced into untrusted_app. 63# This includes what used to be media_app, shared_app, and release_app. 64# 65 66# Access to /data/media. 67allow untrusted_app_all media_rw_data_file:dir create_dir_perms; 68allow untrusted_app_all media_rw_data_file:file create_file_perms; 69 70# Traverse into /mnt/media_rw for bypassing FUSE daemon 71# TODO: narrow this to just MediaProvider 72allow untrusted_app_all mnt_media_rw_file:dir search; 73 74# allow cts to query all services 75allow untrusted_app_all servicemanager:service_manager list; 76 77allow untrusted_app_all audioserver_service:service_manager find; 78allow untrusted_app_all cameraserver_service:service_manager find; 79allow untrusted_app_all drmserver_service:service_manager find; 80allow untrusted_app_all mediaserver_service:service_manager find; 81allow untrusted_app_all mediaextractor_service:service_manager find; 82allow untrusted_app_all mediacodec_service:service_manager find; 83allow untrusted_app_all mediametrics_service:service_manager find; 84allow untrusted_app_all mediadrmserver_service:service_manager find; 85allow untrusted_app_all nfc_service:service_manager find; 86allow untrusted_app_all radio_service:service_manager find; 87allow untrusted_app_all app_api_service:service_manager find; 88allow untrusted_app_all vr_manager_service:service_manager find; 89 90# Allow GMS core to access perfprofd output, which is stored 91# in /data/misc/perfprofd/. GMS core will need to list all 92# data stored in that directory to process them one by one. 93userdebug_or_eng(` 94 allow untrusted_app_all perfprofd_data_file:file r_file_perms; 95 allow untrusted_app_all perfprofd_data_file:dir r_dir_perms; 96') 97 98# gdbserver for ndk-gdb ptrace attaches to app process. 99allow untrusted_app_all self:process ptrace; 100 101# Cts: HwRngTest 102allow untrusted_app_all sysfs_hwrandom:dir search; 103allow untrusted_app_all sysfs_hwrandom:file r_file_perms; 104 105# Allow apps to view preloaded media content 106allow untrusted_app_all preloads_media_file:dir r_dir_perms; 107allow untrusted_app_all preloads_media_file:file r_file_perms; 108allow untrusted_app_all preloads_data_file:dir search; 109 110# Allow untrusted apps read / execute access to /vendor/app for there can 111# be pre-installed vendor apps that package a library within themselves. 112# TODO (b/37784178) Consider creating a special type for /vendor/app installed 113# apps. 114allow untrusted_app_all vendor_app_file:dir { open getattr read search }; 115allow untrusted_app_all vendor_app_file:file { open getattr read execute }; 116allow untrusted_app_all vendor_app_file:lnk_file { open getattr read }; 117 118# Write app-specific trace data to the Perfetto traced damon. This requires 119# connecting to its producer socket and obtaining a (per-process) tmpfs fd. 120allow untrusted_app_all traced:fd use; 121allow untrusted_app_all traced_tmpfs:file { read write getattr map }; 122unix_socket_connect(untrusted_app_all, traced_producer, traced) 123 124# allow untrusted apps to use UDP sockets provided by the system server but not 125# modify them other than to connect 126allow untrusted_app_all system_server:udp_socket { 127 connect getattr read recvfrom sendto write getopt setopt }; 128 129# Allow the allocation and use of ptys 130# Used by: https://play.google.com/store/apps/details?id=jackpal.androidterm 131create_pty(untrusted_app_all) 132 133# This is allowed for targetSdkVersion <= 25 but disallowed on newer versions. 134dontaudit untrusted_app_all net_dns_prop:file read; 135 136# These have been disallowed since Android O. 137# For P, we assume that apps are safely handling the denial. 138dontaudit untrusted_app_all proc_stat:file read; 139dontaudit untrusted_app_all proc_vmstat:file read; 140dontaudit untrusted_app_all proc_uptime:file read; 141