From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Pratyush Date: Wed, 17 Aug 2022 08:30:59 +0200 Subject: [PATCH] add option of always randomizing MAC addresses Co-authored-by: renlord --- framework/api/current.txt | 1 + .../java/android/net/wifi/WifiConfiguration.java | 13 ++++++++++--- .../com/android/server/wifi/WifiConfigManager.java | 7 ++++++- .../android/server/wifi/WifiConfigurationUtil.java | 2 +- 4 files changed, 18 insertions(+), 5 deletions(-) diff --git a/framework/api/current.txt b/framework/api/current.txt index 40d2765497..8566ca7fc7 100644 --- a/framework/api/current.txt +++ b/framework/api/current.txt @@ -172,6 +172,7 @@ package android.net.wifi { method @Deprecated public void writeToParcel(android.os.Parcel, int); field @Deprecated public String BSSID; field @Deprecated public String FQDN; + field @Deprecated public static final int RANDOMIZATION_ALWAYS = 100; // 0x64 field @Deprecated public static final int RANDOMIZATION_AUTO = 3; // 0x3 field @Deprecated public static final int RANDOMIZATION_NONE = 0; // 0x0 field @Deprecated public static final int RANDOMIZATION_NON_PERSISTENT = 2; // 0x2 diff --git a/framework/java/android/net/wifi/WifiConfiguration.java b/framework/java/android/net/wifi/WifiConfiguration.java index 0b63780ca2..0ead2c76c0 100644 --- a/framework/java/android/net/wifi/WifiConfiguration.java +++ b/framework/java/android/net/wifi/WifiConfiguration.java @@ -1856,7 +1856,8 @@ public class WifiConfiguration implements Parcelable { RANDOMIZATION_NONE, RANDOMIZATION_PERSISTENT, RANDOMIZATION_NON_PERSISTENT, - RANDOMIZATION_AUTO}) + RANDOMIZATION_AUTO, + RANDOMIZATION_ALWAYS}) public @interface MacRandomizationSetting {} /** @@ -1880,16 +1881,22 @@ public class WifiConfiguration implements Parcelable { */ public static final int RANDOMIZATION_AUTO = 3; + /** + * Generate a randomize MAC always + */ + public static final int RANDOMIZATION_ALWAYS = 100; + /** * Level of MAC randomization for this network. * One of {@link #RANDOMIZATION_NONE}, {@link #RANDOMIZATION_AUTO}, * {@link #RANDOMIZATION_PERSISTENT} or {@link #RANDOMIZATION_NON_PERSISTENT}. - * By default this field is set to {@link #RANDOMIZATION_AUTO}. + * {@link #RANDOMIZATION_PERSISTENT} or {@link #RANDOMIZATION_NON_PERSISTENT} or RANDOMIZATION_ALWAYS. + * By default this field is set to RANDOMIZATION_ALWAYS in GrapheneOS. * @hide */ @SystemApi @MacRandomizationSetting - public int macRandomizationSetting = RANDOMIZATION_AUTO; + public int macRandomizationSetting = RANDOMIZATION_ALWAYS; /** * Set the MAC randomization setting for this network. diff --git a/service/java/com/android/server/wifi/WifiConfigManager.java b/service/java/com/android/server/wifi/WifiConfigManager.java index ec6359f900..143f8b98e2 100644 --- a/service/java/com/android/server/wifi/WifiConfigManager.java +++ b/service/java/com/android/server/wifi/WifiConfigManager.java @@ -491,6 +491,10 @@ public class WifiConfigManager { * @return */ public boolean shouldUseNonPersistentRandomization(WifiConfiguration config) { + if (config.macRandomizationSetting == WifiConfiguration.RANDOMIZATION_ALWAYS) { + return true; + } + if (!isMacRandomizationSupported() || config.macRandomizationSetting == WifiConfiguration.RANDOMIZATION_NONE) { return false; @@ -640,7 +644,8 @@ public class WifiConfigManager { private MacAddress updateRandomizedMacIfNeeded(WifiConfiguration config) { boolean shouldUpdateMac = config.randomizedMacExpirationTimeMs < mClock.getWallClockMillis() || mClock.getWallClockMillis() - - config.randomizedMacLastModifiedTimeMs >= NON_PERSISTENT_MAC_REFRESH_MS_MAX; + - config.randomizedMacLastModifiedTimeMs >= NON_PERSISTENT_MAC_REFRESH_MS_MAX || + config.macRandomizationSetting == WifiConfiguration.RANDOMIZATION_ALWAYS; if (!shouldUpdateMac) { return config.getRandomizedMacAddress(); } diff --git a/service/java/com/android/server/wifi/WifiConfigurationUtil.java b/service/java/com/android/server/wifi/WifiConfigurationUtil.java index a1bfb7a9cb..c6ca8766d7 100644 --- a/service/java/com/android/server/wifi/WifiConfigurationUtil.java +++ b/service/java/com/android/server/wifi/WifiConfigurationUtil.java @@ -265,7 +265,7 @@ public class WifiConfigurationUtil { public static boolean hasMacRandomizationSettingsChanged(WifiConfiguration existingConfig, WifiConfiguration newConfig) { if (existingConfig == null) { - return newConfig.macRandomizationSetting != WifiConfiguration.RANDOMIZATION_AUTO; + return newConfig.macRandomizationSetting != WifiConfiguration.RANDOMIZATION_ALWAYS; } return newConfig.macRandomizationSetting != existingConfig.macRandomizationSetting; }