From 13dec5fa5b860871afea47f85842706095e40527 Mon Sep 17 00:00:00 2001
From: Paul Lawrence <paullawrence@google.com>
Date: Tue, 28 Apr 2015 22:06:29 +0000
Subject: [PATCH] Securely encrypt the master key
Move all key management into vold
Reuse vold's existing key management through the crypto footer
to manage the device wide keys.
Use ro.crypto.type flag to determine crypto type, which prevents
any issues when running in block encrypted mode, as well as speeding
up boot in block or no encryption.
This is one of four changes to enable this functionality:
https://android-review.googlesource.com/#/c/148586/
https://android-review.googlesource.com/#/c/148604/
https://android-review.googlesource.com/#/c/148606/
https://android-review.googlesource.com/#/c/148607/
Bug: 18151196
Change-Id: I3208b76147df9da83d34cf9034675b0689b6c3a5
---
domain.te | 1 +
init.te | 6 +-----
vold.te | 8 ++++++--
3 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/domain.te b/domain.te
index 7bc2292d5..44612414f 100644
--- a/domain.te
+++ b/domain.te
@@ -93,6 +93,7 @@ allow domain urandom_device:chr_file rw_file_perms;
allow domain random_device:chr_file rw_file_perms;
allow domain properties_device:file r_file_perms;
allow domain init:key search;
+allow domain vold:key search;
# logd access
write_logd(domain)
diff --git a/init.te b/init.te
index 9f624ba77..89ddac79e 100644
--- a/init.te
+++ b/init.te
@@ -257,11 +257,7 @@ allow init pstorefs:file r_file_perms;
# linux keyring configuration
allow init init:key { write search setattr };
-# Allow init to link temp fs to unencrypted data on userdata
-allow init tmpfs:lnk_file { create read getattr relabelfrom };
-
-# Allow init to manipulate /data/unencrypted
-allow init unencrypted_data_file:{ file lnk_file } create_file_perms;
+# Allow init to create /data/unencrypted
allow init unencrypted_data_file:dir create_dir_perms;
unix_socket_connect(init, vold, vold)
diff --git a/vold.te b/vold.te
index e72822c93..2cbb306d1 100644
--- a/vold.te
+++ b/vold.te
@@ -143,14 +143,18 @@ allow vold userdata_block_device:blk_file rw_file_perms;
# Access metadata block device used for encryption meta-data.
allow vold metadata_block_device:blk_file rw_file_perms;
-# Allow init to manipulate /data/unencrypted
-allow vold unencrypted_data_file:{ file lnk_file } create_file_perms;
+# Allow vold to manipulate /data/unencrypted
+allow vold unencrypted_data_file:{ file } create_file_perms;
allow vold unencrypted_data_file:dir create_dir_perms;
# Give vold a place where only vold can store files; everyone else is off limits
allow vold vold_data_file:dir rw_dir_perms;
allow vold vold_data_file:file create_file_perms;
+# linux keyring configuration
+allow vold init:key { write search setattr };
+allow vold vold:key { write search setattr };
+
neverallow { domain -vold } vold_data_file:dir ~{ open create read getattr setattr search relabelto };
neverallow { domain -vold } vold_data_file:notdevfile_class_set ~{ relabelto getattr };
neverallow { domain -vold -init } vold_data_file:dir *;
--
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