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178 lines
8.0 KiB
178 lines
8.0 KiB
4 months ago
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###
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### Untrusted_app_all.
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###
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### This file defines the rules shared by all untrusted app domains except
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### ephemeral_app for instant apps and isolated_app (which has a reduced
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### permission set).
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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_all attribute is assigned to all default
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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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### attribute 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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### Note that rules that should apply to all untrusted apps must be in app.te or also
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### added to ephemeral_app.te.
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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_all privapp_data_file:file { r_file_perms execute };
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allow untrusted_app_all app_data_file:file { r_file_perms execute };
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auditallow untrusted_app_all app_data_file:file execute;
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# Chrome Crashpad uses the the dynamic linker to load native executables
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# from an APK (b/112050209, crbug.com/928422)
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allow untrusted_app_all system_linker_exec:file execute_no_trans;
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# Follow priv-app symlinks. This is used for dynamite functionality.
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allow untrusted_app_all privapp_data_file:lnk_file r_file_perms;
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# Allow handling of less common filesystem objects
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allow untrusted_app_all app_data_file:{ lnk_file sock_file fifo_file } create_file_perms;
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# Allow loading and deleting executable shared libraries
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# within an application home directory. Such shared libraries would be
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# created by things like renderscript or via other mechanisms.
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allow untrusted_app_all app_exec_data_file:file { r_file_perms execute unlink };
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# ASEC
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allow untrusted_app_all asec_apk_file:file r_file_perms;
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allow untrusted_app_all asec_apk_file:dir r_dir_perms;
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# Execute libs in asec containers.
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allow untrusted_app_all asec_public_file:file { execute };
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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_all shell_data_file:file r_file_perms;
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allow untrusted_app_all shell_data_file:dir r_dir_perms;
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# Allow traceur to pass file descriptors through a content provider to untrusted apps
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# for the purpose of sharing files through e.g. gmail
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allow untrusted_app_all trace_data_file:file { getattr read };
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# untrusted apps should not be able to open trace data files, they should depend
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# upon traceur to pass a file descriptor
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neverallow untrusted_app_all trace_data_file:dir *;
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neverallow untrusted_app_all trace_data_file:file { no_w_file_perms open };
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# neverallow untrusted apps accessing debugfs_tracing
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neverallow untrusted_app_all debugfs_tracing:file no_rw_file_perms;
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# Allow to read staged apks.
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allow untrusted_app_all { apk_tmp_file apk_private_tmp_file }:file {read getattr};
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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_all system_app_data_file:file { read write getattr };
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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 to /data/media.
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allow untrusted_app_all media_rw_data_file:dir create_dir_perms;
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allow untrusted_app_all media_rw_data_file:file create_file_perms;
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# allow cts to query all services
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allow untrusted_app_all servicemanager:service_manager list;
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allow untrusted_app_all audioserver_service:service_manager find;
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allow untrusted_app_all cameraserver_service:service_manager find;
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allow untrusted_app_all drmserver_service:service_manager find;
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allow untrusted_app_all mediaserver_service:service_manager find;
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allow untrusted_app_all mediaextractor_service:service_manager find;
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allow untrusted_app_all mediametrics_service:service_manager find;
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allow untrusted_app_all mediadrmserver_service:service_manager find;
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allow untrusted_app_all nfc_service:service_manager find;
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allow untrusted_app_all radio_service:service_manager find;
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allow untrusted_app_all app_api_service:service_manager find;
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allow untrusted_app_all vr_manager_service:service_manager find;
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# gdbserver for ndk-gdb ptrace attaches to app process.
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allow untrusted_app_all self:process ptrace;
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# Android Studio Instant Run has the application connect to a
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# runas_app socket listening in the abstract namespace.
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# https://developer.android.com/studio/run/
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# b/123297648
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allow untrusted_app_all runas_app:unix_stream_socket connectto;
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# Untrusted apps need to be able to send a SIGCHLD to runas_app
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# when running under a debugger (b/123612207)
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allow untrusted_app_all runas_app:process sigchld;
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# Cts: HwRngTest
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allow untrusted_app_all sysfs_hwrandom:dir search;
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allow untrusted_app_all sysfs_hwrandom:file r_file_perms;
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# Allow apps to view preloaded media content
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allow untrusted_app_all preloads_media_file:dir r_dir_perms;
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allow untrusted_app_all preloads_media_file:file r_file_perms;
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allow untrusted_app_all preloads_data_file:dir search;
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# Allow untrusted apps read / execute access to /vendor/app for there can
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# be pre-installed vendor apps that package a library within themselves.
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# TODO (b/37784178) Consider creating a special type for /vendor/app installed
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# apps.
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allow untrusted_app_all vendor_app_file:dir { open getattr read search };
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allow untrusted_app_all vendor_app_file:file { r_file_perms execute };
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allow untrusted_app_all vendor_app_file:lnk_file { open getattr read };
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# Write app-specific trace data to the Perfetto traced damon. This requires
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# connecting to its producer socket and obtaining a (per-process) tmpfs fd.
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perfetto_producer(untrusted_app_all)
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# Allow profiling if the app opts in by being marked profileable/debuggable.
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can_profile_heap(untrusted_app_all)
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can_profile_perf(untrusted_app_all)
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# allow untrusted apps to use UDP sockets provided by the system server but not
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# modify them other than to connect
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allow untrusted_app_all system_server:udp_socket {
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connect getattr read recvfrom sendto write getopt setopt };
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# Allow the renderscript compiler to be run.
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domain_auto_trans(untrusted_app_all, rs_exec, rs)
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# suppress denials caused by debugfs_tracing
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dontaudit untrusted_app_all debugfs_tracing:file rw_file_perms;
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# This is allowed for targetSdkVersion <= 25 but disallowed on newer versions.
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dontaudit untrusted_app_all net_dns_prop:file read;
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# These have been disallowed since Android O.
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# For P, we assume that apps are safely handling the denial.
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dontaudit untrusted_app_all proc_stat:file read;
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dontaudit untrusted_app_all proc_vmstat:file read;
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dontaudit untrusted_app_all proc_uptime:file read;
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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_all)
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# Allow access to kcov via its ioctl interface for coverage
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# guided kernel fuzzing.
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userdebug_or_eng(`
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allow untrusted_app_all debugfs_kcov:file rw_file_perms;
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allowxperm untrusted_app_all debugfs_kcov:file ioctl { KCOV_INIT_TRACE KCOV_ENABLE KCOV_DISABLE };
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# The use of debugfs kcov is considered a breach of the kernel integrity
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# according to the heuristic of lockdown.
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allow untrusted_app_all self:lockdown integrity;
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')
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# Allow signalling simpleperf domain, which is the domain that the simpleperf
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# profiler runs as when executed by the app. The signals are used to control
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# the profiler (which would be profiling the app that is sending the signal).
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allow untrusted_app_all simpleperf:process signal;
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