From 7b8be35ddfc1d53f20b857d39be04b15b9971181 Mon Sep 17 00:00:00 2001
From: Tom Cherry <tomcherry@google.com>
Date: Thu, 3 May 2018 17:00:16 -0700
Subject: [PATCH] Finer grained permissions for ctl. properties
Currently, permissions for ctl. property apply to each action verb, so
if a domain has permissions for controlling service 'foo', then it can
start, stop, and restart foo.
This change implements finer grainer permissions such that permission
can be given to strictly start a given service, but not stop or
restart it. This new permission scheme is mandatory for the new
control functions, sigstop_on, sigstop_off, interface_start,
interface_stop, interface_restart.
Bug: 78511553
Test: see appropriate successes and failures based on permissions
Merged-In: Ibe0cc0d6028fb0ed7d6bcba626721e0d84cc20fa
Change-Id: Ibe0cc0d6028fb0ed7d6bcba626721e0d84cc20fa
(cherry picked from commit 2208f96e9e6264553fcc8a58b86f4f21a092468c)
---
prebuilts/api/26.0/26.0.cil | 2 +-
private/compat/26.0/26.0.cil | 2 +-
private/compat/26.0/26.0.ignore.cil | 4 ++++
private/compat/27.0/27.0.cil | 2 +-
private/compat/27.0/27.0.ignore.cil | 4 ++++
private/hwservicemanager.te | 3 +--
private/property_contexts | 10 ++++++++++
public/property.te | 28 ++++++++++++++++++++++++++++
8 files changed, 50 insertions(+), 5 deletions(-)
diff --git a/prebuilts/api/26.0/26.0.cil b/prebuilts/api/26.0/26.0.cil
index 4e35ce805..f4c8a4ae6 100644
--- a/prebuilts/api/26.0/26.0.cil
+++ b/prebuilts/api/26.0/26.0.cil
@@ -102,7 +102,7 @@
(typeattributeset ctl_bootanim_prop_26_0 (ctl_bootanim_prop))
(typeattributeset ctl_bugreport_prop_26_0 (ctl_bugreport_prop))
(typeattributeset ctl_console_prop_26_0 (ctl_console_prop))
-(typeattributeset ctl_default_prop_26_0 (ctl_default_prop))
+(typeattributeset ctl_default_prop_26_0 (ctl_default_prop ctl_restart_prop ctl_start_prop ctl_stop_prop))
(typeattributeset ctl_dumpstate_prop_26_0 (ctl_dumpstate_prop))
(typeattributeset ctl_fuse_prop_26_0 (ctl_fuse_prop))
(typeattributeset ctl_mdnsd_prop_26_0 (ctl_mdnsd_prop))
diff --git a/private/compat/26.0/26.0.cil b/private/compat/26.0/26.0.cil
index 8f4db87ab..ee53d77cf 100644
--- a/private/compat/26.0/26.0.cil
+++ b/private/compat/26.0/26.0.cil
@@ -118,7 +118,7 @@
(typeattributeset ctl_bootanim_prop_26_0 (ctl_bootanim_prop))
(typeattributeset ctl_bugreport_prop_26_0 (ctl_bugreport_prop))
(typeattributeset ctl_console_prop_26_0 (ctl_console_prop))
-(typeattributeset ctl_default_prop_26_0 (ctl_default_prop))
+(typeattributeset ctl_default_prop_26_0 (ctl_default_prop ctl_restart_prop ctl_start_prop ctl_stop_prop))
(typeattributeset ctl_dumpstate_prop_26_0 (ctl_dumpstate_prop))
(typeattributeset ctl_fuse_prop_26_0 (ctl_fuse_prop))
(typeattributeset ctl_mdnsd_prop_26_0 (ctl_mdnsd_prop))
diff --git a/private/compat/26.0/26.0.ignore.cil b/private/compat/26.0/26.0.ignore.cil
index 8b4d69ca5..b6782217e 100644
--- a/private/compat/26.0/26.0.ignore.cil
+++ b/private/compat/26.0/26.0.ignore.cil
@@ -17,6 +17,10 @@
broadcastradio_service
cgroup_bpf
crossprofileapps_service
+ ctl_interface_restart_prop
+ ctl_interface_start_prop
+ ctl_interface_stop_prop
+ ctl_sigstop_prop
e2fs
e2fs_exec
exfat
diff --git a/private/compat/27.0/27.0.cil b/private/compat/27.0/27.0.cil
index a329389cd..9f661b230 100644
--- a/private/compat/27.0/27.0.cil
+++ b/private/compat/27.0/27.0.cil
@@ -823,7 +823,7 @@
(typeattributeset ctl_bootanim_prop_27_0 (ctl_bootanim_prop))
(typeattributeset ctl_bugreport_prop_27_0 (ctl_bugreport_prop))
(typeattributeset ctl_console_prop_27_0 (ctl_console_prop))
-(typeattributeset ctl_default_prop_27_0 (ctl_default_prop))
+(typeattributeset ctl_default_prop_27_0 (ctl_default_prop ctl_restart_prop ctl_start_prop ctl_stop_prop))
(typeattributeset ctl_dumpstate_prop_27_0 (ctl_dumpstate_prop))
(typeattributeset ctl_fuse_prop_27_0 (ctl_fuse_prop))
(typeattributeset ctl_mdnsd_prop_27_0 (ctl_mdnsd_prop))
diff --git a/private/compat/27.0/27.0.ignore.cil b/private/compat/27.0/27.0.ignore.cil
index d2ab47477..06f85fc05 100644
--- a/private/compat/27.0/27.0.ignore.cil
+++ b/private/compat/27.0/27.0.ignore.cil
@@ -15,6 +15,10 @@
bpfloader_exec
cgroup_bpf
crossprofileapps_service
+ ctl_interface_restart_prop
+ ctl_interface_start_prop
+ ctl_interface_stop_prop
+ ctl_sigstop_prop
exfat
exported2_config_prop
exported2_default_prop
diff --git a/private/hwservicemanager.te b/private/hwservicemanager.te
index 45b62d075..0705cc711 100644
--- a/private/hwservicemanager.te
+++ b/private/hwservicemanager.te
@@ -5,5 +5,4 @@ init_daemon_domain(hwservicemanager)
add_hwservice(hwservicemanager, hidl_manager_hwservice)
add_hwservice(hwservicemanager, hidl_token_hwservice)
-set_prop(hwservicemanager, ctl_default_prop)
-set_prop(hwservicemanager, ctl_dumpstate_prop)
+set_prop(hwservicemanager, ctl_interface_start_prop)
diff --git a/private/property_contexts b/private/property_contexts
index 1b2743284..32be0b377 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -104,6 +104,16 @@ ctl.bugreport u:object_r:ctl_bugreport_prop:s0
ctl.console u:object_r:ctl_console_prop:s0
ctl. u:object_r:ctl_default_prop:s0
+# Don't allow blind access to all services
+ctl.sigstop_on$ u:object_r:ctl_sigstop_prop:s0
+ctl.sigstop_off$ u:object_r:ctl_sigstop_prop:s0
+ctl.start$ u:object_r:ctl_start_prop:s0
+ctl.stop$ u:object_r:ctl_stop_prop:s0
+ctl.restart$ u:object_r:ctl_restart_prop:s0
+ctl.interface_start$ u:object_r:ctl_interface_start_prop:s0
+ctl.interface_stop$ u:object_r:ctl_interface_stop_prop:s0
+ctl.interface_restart$ u:object_r:ctl_interface_restart_prop:s0
+
# NFC properties
nfc. u:object_r:nfc_prop:s0
diff --git a/public/property.te b/public/property.te
index de8e4bec9..f8dfb0484 100644
--- a/public/property.te
+++ b/public/property.te
@@ -11,8 +11,15 @@ type ctl_console_prop, property_type;
type ctl_default_prop, property_type;
type ctl_dumpstate_prop, property_type;
type ctl_fuse_prop, property_type;
+type ctl_interface_restart_prop, property_type;
+type ctl_interface_start_prop, property_type;
+type ctl_interface_stop_prop, property_type;
type ctl_mdnsd_prop, property_type;
+type ctl_restart_prop, property_type;
type ctl_rildaemon_prop, property_type;
+type ctl_sigstop_prop, property_type;
+type ctl_start_prop, property_type;
+type ctl_stop_prop, property_type;
type dalvik_prop, property_type, core_property_type;
type debuggerd_prop, property_type, core_property_type;
type debug_prop, property_type, core_property_type;
@@ -123,6 +130,27 @@ neverallow * {
-vold_prop
}:file no_rw_file_perms;
+# sigstop property is only used for debugging; should only be set by su which is permissive
+# for userdebug/eng
+neverallow {
+ domain
+ -init
+ -vendor_init
+} ctl_sigstop_prop:property_service set;
+
+# Don't audit legacy ctl. property handling. We only want the newer permission check to appear
+# in the audit log
+dontaudit domain {
+ ctl_bootanim_prop
+ ctl_bugreport_prop
+ ctl_console_prop
+ ctl_default_prop
+ ctl_dumpstate_prop
+ ctl_fuse_prop
+ ctl_mdnsd_prop
+ ctl_rildaemon_prop
+}:property_service set;
+
compatible_property_only(`
# Prevent properties from being set
neverallow {
--
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