1# installer daemon 2type installd, domain; 3type installd_exec, exec_type, file_type; 4typeattribute installd mlstrustedsubject; 5allow installd self:global_capability_class_set { chown dac_override fowner fsetid setgid setuid sys_admin }; 6 7# Allow labeling of files under /data/app/com.example/oat/ 8allow installd dalvikcache_data_file:dir relabelto; 9allow installd dalvikcache_data_file:file { relabelto link }; 10 11# Allow movement of APK files between volumes 12allow installd apk_data_file:dir { create_dir_perms relabelfrom }; 13allow installd apk_data_file:file { create_file_perms relabelfrom link }; 14allow installd apk_data_file:lnk_file { create r_file_perms unlink }; 15 16allow installd asec_apk_file:file r_file_perms; 17allow installd apk_tmp_file:file { r_file_perms unlink }; 18allow installd apk_tmp_file:dir { relabelfrom create_dir_perms }; 19allow installd oemfs:dir r_dir_perms; 20allow installd oemfs:file r_file_perms; 21allow installd cgroup:dir create_dir_perms; 22allow installd mnt_expand_file:dir { search getattr }; 23# Check validity of SELinux context before use. 24selinux_check_context(installd) 25 26r_dir_file(installd, rootfs) 27# Scan through APKs in /system/app and /system/priv-app 28r_dir_file(installd, system_file) 29# Scan through APKs in /vendor/app 30r_dir_file(installd, vendor_app_file) 31# Scan through Runtime Resource Overlay APKs in /vendor/overlay 32r_dir_file(installd, vendor_overlay_file) 33# Get file context 34allow installd file_contexts_file:file r_file_perms; 35# Get seapp_context 36allow installd seapp_contexts_file:file r_file_perms; 37 38# Search /data/app-asec and stat files in it. 39allow installd asec_image_file:dir search; 40allow installd asec_image_file:file getattr; 41 42# Create /data/user and /data/user/0 if necessary. 43# Also required to initially create /data/data subdirectories 44# and lib symlinks before the setfilecon call. May want to 45# move symlink creation after setfilecon in installd. 46allow installd system_data_file:dir create_dir_perms; 47# Also, allow read for lnk_file so that we can process /data/user/0 links when 48# optimizing application code. 49allow installd system_data_file:lnk_file { create getattr read setattr unlink }; 50 51# Upgrade /data/media for multi-user if necessary. 52allow installd media_rw_data_file:dir create_dir_perms; 53allow installd media_rw_data_file:file { getattr unlink }; 54# restorecon new /data/media directory. 55allow installd system_data_file:dir relabelfrom; 56allow installd media_rw_data_file:dir relabelto; 57 58# Delete /data/media files through sdcardfs, instead of going behind its back 59allow installd tmpfs:dir r_dir_perms; 60allow installd storage_file:dir search; 61allow installd sdcardfs:dir { search open read write remove_name getattr rmdir }; 62allow installd sdcardfs:file { getattr unlink }; 63 64# Upgrade /data/misc/keychain for multi-user if necessary. 65allow installd misc_user_data_file:dir create_dir_perms; 66allow installd misc_user_data_file:file create_file_perms; 67allow installd keychain_data_file:dir create_dir_perms; 68allow installd keychain_data_file:file {r_file_perms unlink}; 69 70# Create /data/.layout_version.* file 71allow installd install_data_file:file create_file_perms; 72 73# Create files under /data/dalvik-cache. 74allow installd dalvikcache_data_file:dir create_dir_perms; 75allow installd dalvikcache_data_file:file create_file_perms; 76allow installd dalvikcache_data_file:lnk_file getattr; 77 78# Create files under /data/resource-cache. 79allow installd resourcecache_data_file:dir rw_dir_perms; 80allow installd resourcecache_data_file:file create_file_perms; 81 82# Upgrade from unlabeled userdata. 83# Just need enough to remove and/or relabel it. 84allow installd unlabeled:dir { getattr search relabelfrom rw_dir_perms rmdir }; 85allow installd unlabeled:notdevfile_class_set { getattr relabelfrom rename unlink setattr }; 86# Read pkg.apk file for input during dexopt. 87allow installd unlabeled:file r_file_perms; 88 89# Upgrade from before system_app_data_file was used for system UID apps. 90# Just need enough to relabel it and to unlink removed package files. 91# Directory access covered by earlier rule above. 92allow installd system_data_file:notdevfile_class_set { getattr relabelfrom unlink }; 93 94# Manage /data/data subdirectories, including initially labeling them 95# upon creation via setfilecon or running restorecon_recursive, 96# setting owner/mode, creating symlinks within them, and deleting them 97# upon package uninstall. 98# Types extracted from seapp_contexts type= fields. 99allow installd { 100 system_app_data_file 101 bluetooth_data_file 102 nfc_data_file 103 radio_data_file 104 shell_data_file 105 app_data_file 106}:dir { create_dir_perms relabelfrom relabelto }; 107 108allow installd { 109 system_app_data_file 110 bluetooth_data_file 111 nfc_data_file 112 radio_data_file 113 shell_data_file 114 app_data_file 115}:notdevfile_class_set { create_file_perms relabelfrom relabelto }; 116 117# Similar for the files under /data/misc/profiles/ 118allow installd user_profile_data_file:dir create_dir_perms; 119allow installd user_profile_data_file:file create_file_perms; 120allow installd user_profile_data_file:dir rmdir; 121allow installd user_profile_data_file:file unlink; 122 123# Files created/updated by profman dumps. 124allow installd profman_dump_data_file:dir { search add_name write }; 125allow installd profman_dump_data_file:file { create setattr open write }; 126 127# Create and use pty created by android_fork_execvp(). 128allow installd devpts:chr_file rw_file_perms; 129 130# execute toybox for app relocation 131allow installd toolbox_exec:file rx_file_perms; 132 133# Allow installd to publish a binder service and make binder calls. 134binder_use(installd) 135add_service(installd, installd_service) 136allow installd dumpstate:fifo_file { getattr write }; 137 138# Allow installd to call into the system server so it can check permissions. 139binder_call(installd, system_server) 140allow installd permission_service:service_manager find; 141 142# Allow installd to read and write quotas 143allow installd block_device:dir { search }; 144allow installd labeledfs:filesystem { quotaget quotamod }; 145 146# Allow installd to delete from /data/preloads when trimming data caches 147# TODO b/34690396 Remove when time-based purge policy for preloads is implemented in system_server 148allow installd preloads_data_file:file { r_file_perms unlink }; 149allow installd preloads_data_file:dir { r_dir_perms write remove_name rmdir }; 150allow installd preloads_media_file:file { r_file_perms unlink }; 151allow installd preloads_media_file:dir { r_dir_perms write remove_name rmdir }; 152 153### 154### Neverallow rules 155### 156 157# only system_server, installd and dumpstate may interact with installd over binder 158neverallow { domain -system_server -dumpstate -installd } installd_service:service_manager find; 159neverallow { domain -system_server -dumpstate } installd:binder call; 160neverallow installd { domain -system_server -servicemanager userdebug_or_eng(`-su') }:binder call; 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