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69 lines
2.6 KiB
69 lines
2.6 KiB
4 months ago
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###
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### Ephemeral apps.
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###
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### This file defines the security policy for apps with the ephemeral
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### feature.
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###
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### The ephemeral_app domain is a reduced permissions sandbox allowing
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### ephemeral applications to be safely installed and run. Non ephemeral
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### applications may also opt-in to ephemeral to take advantage of the
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### additional security features.
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###
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### PackageManager flags an app as ephemeral at install time.
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typeattribute ephemeral_app coredomain;
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net_domain(ephemeral_app)
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app_domain(ephemeral_app)
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# Allow ephemeral apps to read/write files in visible storage if provided fds
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allow ephemeral_app { sdcard_type media_rw_data_file }:file {read write getattr ioctl lock append};
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# services
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allow ephemeral_app audioserver_service:service_manager find;
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allow ephemeral_app cameraserver_service:service_manager find;
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allow ephemeral_app mediaserver_service:service_manager find;
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allow ephemeral_app mediaextractor_service:service_manager find;
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allow ephemeral_app mediacodec_service:service_manager find;
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allow ephemeral_app mediametrics_service:service_manager find;
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allow ephemeral_app mediadrmserver_service:service_manager find;
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allow ephemeral_app mediacasserver_service:service_manager find;
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allow ephemeral_app surfaceflinger_service:service_manager find;
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allow ephemeral_app radio_service:service_manager find;
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allow ephemeral_app ephemeral_app_api_service:service_manager find;
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###
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### neverallow rules
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###
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# Executable content should never be loaded from an ephemeral app home directory.
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neverallow ephemeral_app app_data_file:file { execute execute_no_trans };
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# Receive or send uevent messages.
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neverallow ephemeral_app domain:netlink_kobject_uevent_socket *;
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# Receive or send generic netlink messages
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neverallow ephemeral_app domain:netlink_socket *;
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# Too much leaky information in debugfs. It's a security
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# best practice to ensure these files aren't readable.
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neverallow ephemeral_app debugfs:file read;
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# execute gpu_device
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neverallow ephemeral_app gpu_device:chr_file execute;
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# access files in /sys with the default sysfs label
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neverallow ephemeral_app sysfs:file *;
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# Avoid reads from generically labeled /proc files
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# Create a more specific label if needed
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neverallow ephemeral_app proc:file { no_rw_file_perms no_x_file_perms };
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# Directly access external storage
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neverallow ephemeral_app { sdcard_type media_rw_data_file }:file {open create};
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neverallow ephemeral_app { sdcard_type media_rw_data_file }:dir search;
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# Avoid reads to proc_net, it contains too much device wide information about
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# ongoing connections.
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neverallow ephemeral_app proc_net:file no_rw_file_perms;
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