5f34265c5a
* commit 'a910a287d81bf5e9885af9e5be60ed444964a86a': Remove untrusted_app access to tmp apk files
152 lines
6.1 KiB
Text
152 lines
6.1 KiB
Text
###
|
|
### Untrusted apps.
|
|
###
|
|
### This file defines the rules for untrusted 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 domain is the default assignment in
|
|
### 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
|
|
### domain 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.
|
|
###
|
|
### untrusted_app includes all the appdomain rules, plus the
|
|
### additional following rules:
|
|
###
|
|
|
|
type untrusted_app, domain;
|
|
app_domain(untrusted_app)
|
|
net_domain(untrusted_app)
|
|
bluetooth_domain(untrusted_app)
|
|
|
|
# Some apps ship with shared libraries and binaries that they write out
|
|
# to their sandbox directory and then execute.
|
|
allow untrusted_app app_data_file:file { rx_file_perms execmod };
|
|
|
|
# Third party vpn apps receive an open tun fd from the framework for
|
|
# device traffic. Do not allow untrusted app to directly open tun_device
|
|
allow untrusted_app tun_device:chr_file { read write getattr ioctl append };
|
|
|
|
# ASEC
|
|
allow untrusted_app asec_apk_file:file r_file_perms;
|
|
# Execute libs in asec containers.
|
|
allow untrusted_app asec_public_file:file { execute execmod };
|
|
|
|
# Allow the allocation and use of ptys
|
|
# Used by: https://play.google.com/store/apps/details?id=jackpal.androidterm
|
|
create_pty(untrusted_app)
|
|
|
|
# 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 shell_data_file:file r_file_perms;
|
|
allow untrusted_app shell_data_file:dir r_dir_perms;
|
|
|
|
# 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 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 /dev/mtp_usb.
|
|
allow untrusted_app mtp_device:chr_file rw_file_perms;
|
|
|
|
# Access to /data/media.
|
|
allow untrusted_app media_rw_data_file:dir create_dir_perms;
|
|
allow untrusted_app 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 mnt_media_rw_file:dir search;
|
|
|
|
# allow cts to query all services
|
|
allow untrusted_app servicemanager:service_manager list;
|
|
|
|
allow untrusted_app drmserver_service:service_manager find;
|
|
allow untrusted_app mediaserver_service:service_manager find;
|
|
allow untrusted_app nfc_service:service_manager find;
|
|
allow untrusted_app radio_service:service_manager find;
|
|
allow untrusted_app surfaceflinger_service:service_manager find;
|
|
allow untrusted_app app_api_service:service_manager find;
|
|
|
|
# only allow unprivileged socket ioctl commands
|
|
allow untrusted_app self:{ rawip_socket tcp_socket udp_socket } unpriv_sock_ioctls;
|
|
|
|
# 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 perfprofd_data_file:file r_file_perms;
|
|
allow untrusted_app perfprofd_data_file:dir r_dir_perms;
|
|
')
|
|
|
|
# gdbserver for ndk-gdb ptrace attaches to app process.
|
|
allow untrusted_app self:process ptrace;
|
|
|
|
# Programs routinely attempt to scan through /system, looking
|
|
# for files. Suppress the denials when they occur.
|
|
dontaudit untrusted_app exec_type:file getattr;
|
|
|
|
###
|
|
### neverallow rules
|
|
###
|
|
|
|
# Receive or send uevent messages.
|
|
neverallow untrusted_app domain:netlink_kobject_uevent_socket *;
|
|
|
|
# Receive or send generic netlink messages
|
|
neverallow untrusted_app domain:netlink_socket *;
|
|
|
|
# Too much leaky information in debugfs. It's a security
|
|
# best practice to ensure these files aren't readable.
|
|
neverallow untrusted_app debugfs:file read;
|
|
|
|
# Do not allow untrusted apps to register services.
|
|
# Only trusted components of Android should be registering
|
|
# services.
|
|
neverallow untrusted_app service_manager_type:service_manager add;
|
|
|
|
# Do not allow untrusted_apps to connect to the property service
|
|
# or set properties. b/10243159
|
|
neverallow untrusted_app property_socket:sock_file write;
|
|
neverallow untrusted_app init:unix_stream_socket connectto;
|
|
neverallow untrusted_app property_type:property_service set;
|
|
|
|
# Do not allow untrusted_app to be assigned mlstrustedsubject.
|
|
# This would undermine the per-user isolation model being
|
|
# enforced via levelFrom=user in seapp_contexts and the mls
|
|
# constraints. As there is no direct way to specify a neverallow
|
|
# on attribute assignment, this relies on the fact that fork
|
|
# permission only makes sense within a domain (hence should
|
|
# never be granted to any other domain within mlstrustedsubject)
|
|
# and untrusted_app is allowed fork permission to itself.
|
|
neverallow untrusted_app mlstrustedsubject:process fork;
|
|
|
|
# Do not allow untrusted_app to hard link to any files.
|
|
# In particular, if untrusted_app links to other app data
|
|
# files, installd will not be able to guarantee the deletion
|
|
# of the linked to file. Hard links also contribute to security
|
|
# bugs, so we want to ensure untrusted_app never has this
|
|
# capability.
|
|
neverallow untrusted_app file_type:file link;
|
|
|
|
# Do not allow untrusted_app to access network MAC address file
|
|
neverallow untrusted_app sysfs_mac_address:file no_rw_file_perms;
|
|
|
|
# Do not allow untrusted app to directly open tun_device
|
|
neverallow untrusted_app tun_device:chr_file open;
|
|
|
|
# Do not allow untrusted_app access to /cache
|
|
neverallow untrusted_app cache_file:dir ~{ r_dir_perms };
|
|
neverallow untrusted_app cache_file:file ~{ read getattr };
|