PWN-Hunter/android_system_sepolicy
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SELinux policy for secure persistent netd storage

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This is used to persist RFC 7217 stable secrets across device reboots.

Test: as follows
    - Manually tested that stable_secret is generated on first use and
      persists until reset of user data partition (factory reset).
    - Tested that "adb shell getprop" was denied access to
      persist.netd.stable_secret after running "adb unroot".
Bug: 17613910

Change-Id: I4dad00fb189d697aceaffae49ad63987c7e45054
This commit is contained in:
Joel Scherpelz 2017-06-08 13:59:41 +09:00
parent 1847a38b4a
commit ef1fd98b6a
3 changed files with 11 additions and 0 deletions
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1
private/property_contexts
View File

@ -50,6 +50,7 @@ persist.logd.logpersistd u:object_r:logpersistd_logging_prop:s0
logd.logpersistd u:object_r:logpersistd_logging_prop:s0
persist.log.tag u:object_r:log_tag_prop:s0
persist.mmc. u:object_r:mmc_prop:s0
persist.netd. u:object_r:netd_prop:s0
persist.sys. u:object_r:system_prop:s0
persist.sys.safemode u:object_r:safemode_prop:s0
ro.sys.safemode u:object_r:safemode_prop:s0

9
public/netd.te
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@ -58,6 +58,7 @@ allow netd dnsmasq:process signal;
allow netd clatd:process signal;
set_prop(netd, ctl_mdnsd_prop)
set_prop(netd, netd_prop)
# Allow netd to publish a binder service and make binder calls.
binder_use(netd)
@ -104,3 +105,11 @@ neverallow netd { app_data_file system_data_file }:dir_file_class_set write;
neverallow { domain -system_server -dumpstate -netd } netd_service:service_manager find;
neverallow { domain -system_server -dumpstate } netd:binder call;
neverallow netd { domain -system_server -servicemanager userdebug_or_eng(`-su') }:binder call;
# persist.netd.stable_secret contains RFC 7217 secret key which should never be
# leaked to other processes. Make sure it never leaks.
neverallow { domain -netd -init } netd_prop:file r_file_perms;
# We want to ensure that no other process ever tries tampering with persist.netd.stable_secret,
# the RFC 7217 secret key managed by netd. Doing so could compromise user privacy.
neverallow { domain -netd -init } netd_prop:property_service set;

1
public/property.te
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@ -30,6 +30,7 @@ type log_tag_prop, property_type, log_property_type;
type mmc_prop, property_type;
type net_dns_prop, property_type;
type net_radio_prop, property_type, core_property_type;
type netd_prop, property_type;
type nfc_prop, property_type, core_property_type;
type overlay_prop, property_type;
type pan_result_prop, property_type, core_property_type;