1### 2### sdk_sandbox_all 3### 4### This file defines the rules shared by all sdk_sandbox_all domains. 5### Apps are labeled based on mac_permissions.xml (maps signer and 6### optionally package name to seinfo value) and seapp_contexts (maps UID 7### and optionally seinfo value to domain for process and type for data 8### directory). The sdk_sandbox_all_all attribute is assigned to all default 9### seapp_contexts for any app with UID between FIRST_SDK_SANDBOX_UID (20000) 10### and LAST_SDK_SANDBOX_UID (29999) if the app has no specific seinfo 11### value as determined from mac_permissions.xml. 12 13allow sdk_sandbox_all system_linker_exec:file execute_no_trans; 14 15# Required to read CTS tests data from the shell_data_file location. 16allow sdk_sandbox_all shell_data_file:file r_file_perms; 17allow sdk_sandbox_all shell_data_file:dir r_dir_perms; 18 19# allow sdk sandbox to use UDP sockets provided by the system server but not 20# modify them other than to connect 21allow sdk_sandbox_all system_server:udp_socket { 22 connect getattr read recvfrom sendto write getopt setopt }; 23 24# allow sandbox to search in sdk system server directory 25# additionally, for webview to work, getattr has been permitted 26allow sdk_sandbox_all sdk_sandbox_system_data_file:dir { getattr search }; 27# allow sandbox to create files and dirs in sdk data directory 28allow sdk_sandbox_all sdk_sandbox_data_file:dir create_dir_perms; 29allow sdk_sandbox_all sdk_sandbox_data_file:file create_file_perms; 30 31# allow apps to pass open fds to the sdk sandbox 32allow sdk_sandbox_all { app_data_file privapp_data_file }:file { getattr read }; 33 34### 35### neverallow rules 36### 37 38neverallow sdk_sandbox_all { app_data_file privapp_data_file sdk_sandbox_data_file }:file { execute execute_no_trans }; 39 40# Receive or send uevent messages. 41neverallow sdk_sandbox_all domain:netlink_kobject_uevent_socket *; 42 43# Receive or send generic netlink messages 44neverallow sdk_sandbox_all domain:netlink_socket *; 45 46# Too much leaky information in debugfs. It's a security 47# best practice to ensure these files aren't readable. 48neverallow sdk_sandbox_all debugfs:file read; 49 50# execute gpu_device 51neverallow sdk_sandbox_all gpu_device:chr_file execute; 52 53# access files in /sys with the default sysfs label 54neverallow sdk_sandbox_all sysfs:file *; 55 56# Avoid reads from generically labeled /proc files 57# Create a more specific label if needed 58neverallow sdk_sandbox_all proc:file { no_rw_file_perms no_x_file_perms }; 59 60# Directly access external storage 61neverallow sdk_sandbox_all { sdcard_type media_rw_data_file }:file {open create}; 62neverallow sdk_sandbox_all { sdcard_type media_rw_data_file }:dir search; 63 64# Avoid reads to proc_net, it contains too much device wide information about 65# ongoing connections. 66neverallow sdk_sandbox_all proc_net:file no_rw_file_perms; 67 68# SDK sandbox processes have their own storage not related to app_data_file or privapp_data_file 69neverallow sdk_sandbox_all { app_data_file privapp_data_file }:dir no_rw_file_perms; 70neverallow sdk_sandbox_all { app_data_file privapp_data_file }:file ~{ getattr read }; 71 72# SDK sandbox processes don't have any access to external storage 73neverallow sdk_sandbox_all { media_rw_data_file }:dir no_rw_file_perms; 74neverallow sdk_sandbox_all { media_rw_data_file }:file no_rw_file_perms; 75 76neverallow { sdk_sandbox_all } tmpfs:dir no_rw_file_perms; 77 78neverallow sdk_sandbox_all hal_drm_service:service_manager find; 79 80# Only certain system components should have access to sdk_sandbox_system_data_file 81# sdk_sandbox only needs search. Restricted in follow up neverallow rule. 82neverallow { 83 domain 84 -init 85 -installd 86 -system_server 87 -vold_prepare_subdirs 88} sdk_sandbox_system_data_file:dir { relabelfrom }; 89 90neverallow { 91 domain 92 -init 93 -installd 94 -sdk_sandbox_all 95 -system_server 96 -vold_prepare_subdirs 97 -zygote 98} sdk_sandbox_system_data_file:dir { create_dir_perms relabelto }; 99 100# Only certain system components should have access to sdk_sandbox_all_system_data_file 101# sdk_sandbox_all only needs search. Restricted in follow up neverallow rule. 102neverallow { 103 domain 104 -init 105 -installd 106 -system_server 107 -vold_prepare_subdirs 108} sdk_sandbox_system_data_file:dir { relabelfrom }; 109 110neverallow { 111 domain 112 -init 113 -installd 114 -sdk_sandbox_all 115 -system_server 116 -vold_prepare_subdirs 117 -zygote 118} sdk_sandbox_system_data_file:dir { create_dir_perms relabelto }; 119 120# sdk_sandbox_all only needs to traverse through the sdk_sandbox_all_system_data_file 121neverallow sdk_sandbox_all sdk_sandbox_system_data_file:dir ~{ getattr search }; 122 123# Only dirs should be created at sdk_sandbox_all_system_data_file level 124neverallow { domain -init } sdk_sandbox_system_data_file:file *; 125 126