2013-07-12 16:33:29 -07:00
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###
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### Untrusted apps.
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###
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2014-02-21 10:26:20 -08:00
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### This file defines the rules for untrusted apps.
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### Apps are labeled based on mac_permissions.xml (maps signer and
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### optionally package name to seinfo value) and seapp_contexts (maps UID
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### and optionally seinfo value to domain for process and type for data
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### directory). The untrusted_app domain is the default assignment in
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### seapp_contexts for any app with UID between APP_AID (10000)
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### and AID_ISOLATED_START (99000) if the app has no specific seinfo
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### value as determined from mac_permissions.xml. In current AOSP, this
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### domain is assigned to all non-system apps as well as to any system apps
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Coalesce shared_app, media_app, release_app into untrusted_app.
This change folds the shared_app, media_app, and release_app
domains into untrusted_app, reducing the set of app domains down
to just distinct domains for the fixed UID apps (e.g. system_app, bluetooth,
nfc, radio), a single domain for apps signed by the platform key
(platform_app), and a single domain for all other apps (untrusted_app).
Thus, SELinux only distinguishes when already distinguished by a predefined
Android ID (AID) or by the platform certificate (which get the signature-only
Android permissions and thus may require special OS-level accesses).
It is still possible to introduce specific app domains for specific
apps by adding signer and package stanzas to mac_permissions.xml,
but this can be done on an as-needed basis for specialized apps that
require particular OS-level permissions outside the usual set.
As there is now only a single platform app domains, get rid of the
platformappdomain attribute and platform_app_domain() macro. We used
to add mlstrustedsubject to those domains but drop this since we are not
using MLS in AOSP presently; we can revisit which domains need it if/when
we use MLS.
Since we are dropping the shared, media, and release seinfo entries from
seapp_contexts, drop them from mac_permissions.xml as well. However,
we leave the keys.conf entries in case someone wants to add a signer
entry in the future for specific apps signed by those keys to
mac_permissions.xml.
Change-Id: I877192cca07360c4a3c0ef475f016cc273e1d968
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-04-04 06:09:25 -07:00
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### that are not signed by the platform key. To move
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2014-02-21 10:26:20 -08:00
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### a system app into a specific domain, add a signer entry for it to
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### mac_permissions.xml and assign it one of the pre-existing seinfo values
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### or define and use a new seinfo value in both mac_permissions.xml and
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### seapp_contexts.
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2013-07-12 16:33:29 -07:00
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###
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### untrusted_app includes all the appdomain rules, plus the
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### additional following rules:
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###
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type untrusted_app, domain;
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app_domain(untrusted_app)
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net_domain(untrusted_app)
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bluetooth_domain(untrusted_app)
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untrusted_app.te / isolated_app.te / app.te first pass
This is my first attempt at creating an enforcing SELinux domain for
apps, untrusted_apps, and isolated_apps. Much of these rules are based on the
contents of app.te as of commit 11153ef34928ab9d13658606695cba192aa03e21
with extensive modifications, some of which are included below.
* Allow communication with netd/dnsproxyd, to allow netd to handle
dns requests
* Allow binder communications with the DNS server
* Allow binder communications with surfaceflinger
* Allow an app to bind to tcp/udp ports
* Allow all domains to read files from the root partition, assuming
the DAC allows access.
In addition, I added a bunch of "neverallow" rules, to assert that
certain capabilities are never added.
This change has a high probability of breaking someone, somewhere.
If it does, then I'm happy to fix the breakage, rollback this change,
or put untrusted_app into permissive mode.
Change-Id: I83f220135d20ab4f70fbd7be9401b5b1def1fe35
2013-07-12 18:45:56 -07:00
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2013-12-11 06:08:09 -08:00
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# Some apps ship with shared libraries and binaries that they write out
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# to their sandbox directory and then execute.
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2014-06-02 14:49:10 -07:00
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allow untrusted_app app_data_file:file { rx_file_perms execmod };
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2013-12-11 06:08:09 -08:00
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untrusted_app.te / isolated_app.te / app.te first pass
This is my first attempt at creating an enforcing SELinux domain for
apps, untrusted_apps, and isolated_apps. Much of these rules are based on the
contents of app.te as of commit 11153ef34928ab9d13658606695cba192aa03e21
with extensive modifications, some of which are included below.
* Allow communication with netd/dnsproxyd, to allow netd to handle
dns requests
* Allow binder communications with the DNS server
* Allow binder communications with surfaceflinger
* Allow an app to bind to tcp/udp ports
* Allow all domains to read files from the root partition, assuming
the DAC allows access.
In addition, I added a bunch of "neverallow" rules, to assert that
certain capabilities are never added.
This change has a high probability of breaking someone, somewhere.
If it does, then I'm happy to fix the breakage, rollback this change,
or put untrusted_app into permissive mode.
Change-Id: I83f220135d20ab4f70fbd7be9401b5b1def1fe35
2013-07-12 18:45:56 -07:00
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allow untrusted_app tun_device:chr_file rw_file_perms;
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# ASEC
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allow untrusted_app asec_apk_file:file r_file_perms;
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2014-02-04 08:36:41 -08:00
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# Execute libs in asec containers.
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2014-06-02 14:49:10 -07:00
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allow untrusted_app asec_public_file:file { execute execmod };
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untrusted_app.te / isolated_app.te / app.te first pass
This is my first attempt at creating an enforcing SELinux domain for
apps, untrusted_apps, and isolated_apps. Much of these rules are based on the
contents of app.te as of commit 11153ef34928ab9d13658606695cba192aa03e21
with extensive modifications, some of which are included below.
* Allow communication with netd/dnsproxyd, to allow netd to handle
dns requests
* Allow binder communications with the DNS server
* Allow binder communications with surfaceflinger
* Allow an app to bind to tcp/udp ports
* Allow all domains to read files from the root partition, assuming
the DAC allows access.
In addition, I added a bunch of "neverallow" rules, to assert that
certain capabilities are never added.
This change has a high probability of breaking someone, somewhere.
If it does, then I'm happy to fix the breakage, rollback this change,
or put untrusted_app into permissive mode.
Change-Id: I83f220135d20ab4f70fbd7be9401b5b1def1fe35
2013-07-12 18:45:56 -07:00
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# Allow the allocation and use of ptys
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# Used by: https://play.google.com/store/apps/details?id=jackpal.androidterm
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2013-09-27 06:44:32 -07:00
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create_pty(untrusted_app)
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2013-07-15 15:48:34 -07:00
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# Used by Finsky / Android "Verify Apps" functionality when
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# running "adb install foo.apk".
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# TODO: Long term, we don't want apps probing into shell data files.
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# Figure out a way to remove these rules.
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2013-09-04 16:12:33 -07:00
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allow untrusted_app shell_data_file:file r_file_perms;
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2013-07-15 15:48:34 -07:00
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allow untrusted_app shell_data_file:dir r_dir_perms;
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Coalesce shared_app, media_app, release_app into untrusted_app.
This change folds the shared_app, media_app, and release_app
domains into untrusted_app, reducing the set of app domains down
to just distinct domains for the fixed UID apps (e.g. system_app, bluetooth,
nfc, radio), a single domain for apps signed by the platform key
(platform_app), and a single domain for all other apps (untrusted_app).
Thus, SELinux only distinguishes when already distinguished by a predefined
Android ID (AID) or by the platform certificate (which get the signature-only
Android permissions and thus may require special OS-level accesses).
It is still possible to introduce specific app domains for specific
apps by adding signer and package stanzas to mac_permissions.xml,
but this can be done on an as-needed basis for specialized apps that
require particular OS-level permissions outside the usual set.
As there is now only a single platform app domains, get rid of the
platformappdomain attribute and platform_app_domain() macro. We used
to add mlstrustedsubject to those domains but drop this since we are not
using MLS in AOSP presently; we can revisit which domains need it if/when
we use MLS.
Since we are dropping the shared, media, and release seinfo entries from
seapp_contexts, drop them from mac_permissions.xml as well. However,
we leave the keys.conf entries in case someone wants to add a signer
entry in the future for specific apps signed by those keys to
mac_permissions.xml.
Change-Id: I877192cca07360c4a3c0ef475f016cc273e1d968
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-04-04 06:09:25 -07:00
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2015-03-05 15:40:04 -08:00
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# Read and write system app data files passed over Binder.
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# Motivating case was /data/data/com.android.settings/cache/*.jpg for
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# cropping or taking user photos.
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allow untrusted_app system_app_data_file:file { read write getattr };
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Coalesce shared_app, media_app, release_app into untrusted_app.
This change folds the shared_app, media_app, and release_app
domains into untrusted_app, reducing the set of app domains down
to just distinct domains for the fixed UID apps (e.g. system_app, bluetooth,
nfc, radio), a single domain for apps signed by the platform key
(platform_app), and a single domain for all other apps (untrusted_app).
Thus, SELinux only distinguishes when already distinguished by a predefined
Android ID (AID) or by the platform certificate (which get the signature-only
Android permissions and thus may require special OS-level accesses).
It is still possible to introduce specific app domains for specific
apps by adding signer and package stanzas to mac_permissions.xml,
but this can be done on an as-needed basis for specialized apps that
require particular OS-level permissions outside the usual set.
As there is now only a single platform app domains, get rid of the
platformappdomain attribute and platform_app_domain() macro. We used
to add mlstrustedsubject to those domains but drop this since we are not
using MLS in AOSP presently; we can revisit which domains need it if/when
we use MLS.
Since we are dropping the shared, media, and release seinfo entries from
seapp_contexts, drop them from mac_permissions.xml as well. However,
we leave the keys.conf entries in case someone wants to add a signer
entry in the future for specific apps signed by those keys to
mac_permissions.xml.
Change-Id: I877192cca07360c4a3c0ef475f016cc273e1d968
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-04-04 06:09:25 -07:00
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#
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# Rules migrated from old app domains coalesced into untrusted_app.
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# This includes what used to be media_app, shared_app, and release_app.
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#
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# Access /dev/mtp_usb.
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allow untrusted_app mtp_device:chr_file rw_file_perms;
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# Access to /data/media.
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allow untrusted_app media_rw_data_file:dir create_dir_perms;
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allow untrusted_app media_rw_data_file:file create_file_perms;
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# Write to /cache.
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allow untrusted_app cache_file:dir create_dir_perms;
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allow untrusted_app cache_file:file create_file_perms;
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2014-05-13 14:45:00 -07:00
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2014-12-11 16:01:27 -08:00
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allow untrusted_app drmserver_service:service_manager find;
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allow untrusted_app mediaserver_service:service_manager find;
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allow untrusted_app nfc_service:service_manager find;
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allow untrusted_app radio_service:service_manager find;
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allow untrusted_app surfaceflinger_service:service_manager find;
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allow untrusted_app system_server_service:service_manager find;
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2014-12-16 15:45:26 -08:00
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allow untrusted_app tmp_system_server_service:service_manager find;
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service_manager_local_audit_domain(untrusted_app)
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auditallow untrusted_app {
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tmp_system_server_service
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-accessibility_service
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-account_service
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-activity_service
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-appops_service
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-appwidget_service
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-assetatlas_service
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-audio_service
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2015-01-15 15:12:18 -08:00
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-backup_service
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2015-03-03 11:20:15 -08:00
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-battery_service
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2015-01-15 15:12:18 -08:00
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-batterystats_service
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2014-12-16 15:45:26 -08:00
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-bluetooth_manager_service
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-connectivity_service
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-content_service
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2015-03-03 11:20:15 -08:00
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-country_detector_service
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-default_android_service
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2014-12-16 15:45:26 -08:00
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-device_policy_service
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-display_service
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-dropbox_service
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-input_method_service
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-input_service
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-jobscheduler_service
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2015-03-03 11:20:15 -08:00
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-launcherapps_service
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2015-01-15 15:12:18 -08:00
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-location_service
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2015-03-03 11:20:15 -08:00
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-lock_settings_service
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-media_router_service
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-media_session_service
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-meminfo_service
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2015-01-15 15:12:18 -08:00
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-mount_service
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2015-03-03 11:20:15 -08:00
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-netpolicy_service
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2015-01-15 15:12:18 -08:00
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-netstats_service
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2015-01-16 17:27:25 -08:00
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-network_management_service
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2015-01-15 15:12:18 -08:00
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-network_score_service
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2014-12-16 15:45:26 -08:00
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-notification_service
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-persistent_data_block_service
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-power_service
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-registry_service
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2015-03-03 11:20:15 -08:00
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-search_service
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-sensorservice_service
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2014-12-16 15:45:26 -08:00
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-textservices_service
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-trust_service
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2015-01-15 15:12:18 -08:00
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-uimode_service
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2014-12-16 15:45:26 -08:00
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-user_service
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2015-01-16 17:27:25 -08:00
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-vibrator_service
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2015-03-03 11:20:15 -08:00
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-voiceinteraction_service
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-wallpaper_service
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2014-12-16 15:45:26 -08:00
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-webviewupdate_service
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-wifi_service
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2015-03-03 11:20:15 -08:00
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-wifip2p_service
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2014-12-16 15:45:26 -08:00
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}:service_manager find;
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2014-07-07 13:56:27 -07:00
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2014-05-13 14:45:00 -07:00
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###
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### neverallow rules
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###
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2014-09-21 23:35:24 -07:00
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# Receive or send uevent messages.
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2015-01-28 17:46:30 -08:00
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neverallow untrusted_app domain:netlink_kobject_uevent_socket *;
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# Receive or send generic netlink messages
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neverallow untrusted_app domain:netlink_socket *;
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2014-09-21 23:35:24 -07:00
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2014-05-13 14:45:00 -07:00
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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 untrusted_app debugfs:file read;
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2014-07-07 09:27:53 -07:00
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# Do not allow untrusted apps to register services.
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# Only trusted components of Android should be registering
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# services.
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neverallow untrusted_app service_manager_type:service_manager add;
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2014-07-09 18:58:04 -07:00
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2014-07-09 19:03:08 -07:00
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# Do not allow untrusted_apps to connect to the property service
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2014-07-09 18:58:04 -07:00
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# or set properties. b/10243159
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neverallow untrusted_app property_socket:sock_file write;
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neverallow untrusted_app init:unix_stream_socket connectto;
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neverallow untrusted_app property_type:property_service set;
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2014-08-06 18:09:35 -07:00
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# Allow verifier to access staged apks.
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allow untrusted_app { apk_tmp_file apk_private_tmp_file }:dir r_dir_perms;
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2014-10-14 15:07:49 -07:00
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allow untrusted_app { apk_tmp_file apk_private_tmp_file }:file r_file_perms;
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