PWN-Hunter/android_system_sepolicy
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Do not allow untrusted_app to open tun_device

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Third party vpn apps must receive open tun fd from the framework
for device traffic.

neverallow untrusted_app open perm and auditallow bluetooth
access to see if the neverallow rule can be expanded to include
all of appdomain.

Bug: 24677682
Change-Id: I68685587228a1044fe1e0f96d4dc08c2adbebe78
This commit is contained in:
Jeff Vander Stoep 2015-10-06 09:11:02 -07:00 committed by Jeffrey Vander Stoep
parent a10f789d28
commit de53051a82
2 changed files with 11 additions and 2 deletions
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6
bluetooth.te
View File

@ -14,8 +14,12 @@ allow bluetooth bluetooth_socket:sock_file create_file_perms;
# bluetooth factory file accesses.
r_dir_file(bluetooth, bluetooth_efs_file)
# Device accesses.
# TODO why does bluetooth require access to tun_device? If not,
# remove access and tighten down neverallow rule so that appdomain is
# not allowed to open (as opposed to just untrusted_app)
# Device accesses. b/24744295
allow bluetooth { tun_device uhid_device hci_attach_dev }:chr_file rw_file_perms;
auditallow bluetooth tun_device:chr_file rw_file_perms;
# Other domains that can create and use bluetooth sockets.
# SELinux does not presently define a specific socket class for

7
untrusted_app.te
View File

@ -29,7 +29,9 @@ bluetooth_domain(untrusted_app)
# to their sandbox directory and then execute.
allow untrusted_app app_data_file:file { rx_file_perms execmod };
allow untrusted_app tun_device:chr_file rw_file_perms;
# 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;
@ -157,3 +159,6 @@ 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;