9ba844fea1
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>
66 lines
2.5 KiB
Text
66 lines
2.5 KiB
Text
###
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### Untrusted apps.
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###
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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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### that are not signed by the platform key. To move
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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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###
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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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permissive_or_unconfined(untrusted_app)
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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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# 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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allow untrusted_app app_data_file:file rx_file_perms;
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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:dir { getattr };
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allow untrusted_app asec_apk_file:file r_file_perms;
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# Execute libs in asec containers.
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allow untrusted_app asec_public_file:file execute;
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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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create_pty(untrusted_app)
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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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allow untrusted_app shell_data_file:file r_file_perms;
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allow untrusted_app shell_data_file:dir r_dir_perms;
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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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