DivestOS/Patches/Copperhead-13.0/android_frameworks_base/2.patch

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2016-12-21 19:30:02 -05:00
From a798817de09cc787850ee957c7326fb36dc6c5a5 Mon Sep 17 00:00:00 2001
From: Daniel Micay <danielmicay@gmail.com>
Date: Thu, 3 Dec 2015 14:27:34 -0500
Subject: [PATCH] support separate encryption/lockscreen passwords
This adds the necessary infrastructure for allowing users to opt-in to a
distinct device encryption passphrase. The passwords are still tied
together by default. This makes it possible to use a complex encryption
passphrase without losing the convenience of a very simple lockscreen
pin.
This feature can be combined with a forced reboot after a chosen number
of failed unlocking attempts to prevent brute-forcing by requiring the
entry of the encryption password instead.
---
core/java/android/provider/Settings.java | 7 +++
.../android/internal/widget/LockPatternUtils.java | 72 +++++++++++++++++++++-
.../com/android/server/LockSettingsService.java | 1 +
3 files changed, 77 insertions(+), 3 deletions(-)
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index e107fd1..a6be540 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -4850,6 +4850,13 @@ public static boolean putFloatForUser(ContentResolver cr, String name, float val
"lock_screen_allow_private_notifications";
/**
+ * Separate password for encryption and the lockscreen.
+ * @hide
+ */
+ public static final String LOCK_SEPARATE_ENCRYPTION_PASSWORD =
+ "lock_separate_encryption_password";
+
+ /**
* Set by the system to track if the user needs to see the call to action for
* the lockscreen notification policy.
* @hide
diff --git a/core/java/com/android/internal/widget/LockPatternUtils.java b/core/java/com/android/internal/widget/LockPatternUtils.java
index ae22b50..25f56e7 100644
--- a/core/java/com/android/internal/widget/LockPatternUtils.java
+++ b/core/java/com/android/internal/widget/LockPatternUtils.java
@@ -457,7 +457,8 @@ public void clearLock(int userHandle) {
// well, we tried...
}
- if (userHandle == UserHandle.USER_OWNER) {
+ if (userHandle == UserHandle.USER_OWNER
+ && !isSeparateEncryptionPasswordEnabled()) {
// Set the encryption password to default.
updateEncryptionPassword(StorageManager.CRYPT_TYPE_DEFAULT, null);
}
@@ -518,7 +519,8 @@ public void saveLockPattern(List<LockPatternView.Cell> pattern, String savedPatt
// Update the device encryption password.
if (userId == UserHandle.USER_OWNER
- && LockPatternUtils.isDeviceEncryptionEnabled()) {
+ && LockPatternUtils.isDeviceEncryptionEnabled()
+ && !isSeparateEncryptionPasswordEnabled()) {
if (!shouldEncryptWithCredentials(true)) {
clearEncryptionPassword();
} else {
@@ -727,7 +729,8 @@ public void saveLockPassword(String password, String savedPassword, int quality,
// Update the device encryption password.
if (userHandle == UserHandle.USER_OWNER
- && LockPatternUtils.isDeviceEncryptionEnabled()) {
+ && LockPatternUtils.isDeviceEncryptionEnabled()
+ && !isSeparateEncryptionPasswordEnabled()) {
if (!shouldEncryptWithCredentials(true)) {
clearEncryptionPassword();
} else {
@@ -1071,6 +1074,69 @@ public void setVisiblePasswordEnabled(boolean enabled, int userId) {
}
}
+ private void updateEncryptionPasswordFromPassword(String password) {
+ if (!TextUtils.isEmpty(password)) {
+ int computedQuality = computePasswordQuality(password);
+ boolean numeric = computedQuality
+ == DevicePolicyManager.PASSWORD_QUALITY_NUMERIC;
+ boolean numericComplex = computedQuality
+ == DevicePolicyManager.PASSWORD_QUALITY_NUMERIC_COMPLEX;
+ int type = numeric || numericComplex ? StorageManager.CRYPT_TYPE_PIN
+ : StorageManager.CRYPT_TYPE_PASSWORD;
+ updateEncryptionPassword(type, password);
+ } else {
+ clearEncryptionPassword();
+ }
+ }
+
+ /**
+ * Set the encryption password separately from the lockscreen password.
+ *
+ * @param password The password to save
+ */
+ public void setSeparateEncryptionPassword(String password) {
+ updateEncryptionPasswordFromPassword(password);
+ setSeparateEncryptionPasswordEnabled(true);
+ }
+
+ /**
+ * Replace the separate encryption password by tying it to the lockscreen
+ * password. No change will occur if the provided lockscreen password is
+ * incorrect.
+ *
+ * @param password The current lockscreen password
+ * @return Whether the lockscreen password was correct.
+ */
+ public void replaceSeparateEncryptionPassword(String password) {
+ updateEncryptionPasswordFromPassword(password);
+ setSeparateEncryptionPasswordEnabled(false);
+ }
+
+ /**
+ * Replace the separate encryption password by tying it to the lockscreen
+ * pattern. No change will occur if the provided lockscreen password is
+ * incorrect.
+ *
+ * @param pattern The current lockscreen pattern
+ * @return Whether the lockscreen pattern was correct.
+ */
+ public void replaceSeparateEncryptionPasswordWithPattern(List<LockPatternView.Cell> pattern) {
+ String stringPattern = patternToString(pattern);
+ updateEncryptionPassword(StorageManager.CRYPT_TYPE_PATTERN, stringPattern);
+ setSeparateEncryptionPasswordEnabled(false);
+ }
+
+ /**
+ * @return Whether the encryption password is separate from the lockscreen password.
+ */
+ public boolean isSeparateEncryptionPasswordEnabled() {
+ return getBoolean(Settings.Secure.LOCK_SEPARATE_ENCRYPTION_PASSWORD, false, UserHandle.USER_OWNER);
+ }
+
+ private void setSeparateEncryptionPasswordEnabled(boolean enabled) {
+ setBoolean(Settings.Secure.LOCK_SEPARATE_ENCRYPTION_PASSWORD, enabled, UserHandle.USER_OWNER);
+ }
+
/**
* @return Whether tactile feedback for the pattern is enabled.
*/
diff --git a/services/core/java/com/android/server/LockSettingsService.java b/services/core/java/com/android/server/LockSettingsService.java
index bb0615d..6e05fde 100644
--- a/services/core/java/com/android/server/LockSettingsService.java
+++ b/services/core/java/com/android/server/LockSettingsService.java
@@ -813,6 +813,7 @@ public void requireStrongAuth(int strongAuthReason, int userId) {
Secure.LOCK_PATTERN_SIZE,
Secure.LOCK_DOTS_VISIBLE,
Secure.LOCK_SHOW_ERROR_PATH,
+ Secure.LOCK_SEPARATE_ENCRYPTION_PASSWORD
};
// Reading these settings needs the contacts permission