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security: disable auto backup, rewrite backup rules as allowlist, harden data extraction rules for Android 12+

This commit is contained in:
null 2026-06-16 21:58:17 -05:00
parent 403a8c02e2
commit 95ea9ffed5
3 changed files with 42 additions and 4 deletions
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2
app/src/main/AndroidManifest.xml
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@ -6,7 +6,7 @@
<application <application
android:name=".CloserApp" android:name=".CloserApp"
android:allowBackup="true" android:allowBackup="false"
android:dataExtractionRules="@xml/data_extraction_rules" android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules" android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher" android:icon="@mipmap/ic_launcher"

19
app/src/main/res/xml/backup_rules.xml
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@ -1,5 +1,22 @@
<?xml version="1.0" encoding="utf-8"?> <?xml version="1.0" encoding="utf-8"?>
<!--
BACKUP RULES - ALLOWLIST APPROACH
The relationship app uses allowlist (whitelist) backup rules for security.
Only explicitly listed items may be backed up. Any new storage (databases,
shared preferences, DataStore files, etc.) must be manually evaluated and
added to this allowlist if backup is safe and desired.
By default, no app data is backed up. Sensitive items like databases,
shared preferences, and DataStore files are excluded.
To add an item: add a <include> element with appropriate domain/path.
To exclude an item: add an <exclude> element with appropriate domain/path.
-->
<full-backup-content> <full-backup-content>
<exclude domain="sharedpref" path="local_answers" /> <!-- No items included by default - sensitive data only -->
<!-- Explicit exclusions for clarity (all default storage types) -->
<exclude domain="database" path="." /> <exclude domain="database" path="." />
<exclude domain="sharedpref" path="." />
<exclude domain="file" path="." />
</full-backup-content> </full-backup-content>

25
app/src/main/res/xml/data_extraction_rules.xml
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@ -1,11 +1,32 @@
<?xml version="1.0" encoding="utf-8"?> <?xml version="1.0" encoding="utf-8"?>
<!--
DATA EXTRACTION RULES - ALLOWLIST APPROACH
Android 12+ backup/extraction rules for cloud backup and device transfer.
Uses allowlist (whitelist) approach for security - only explicitly listed
items may be backed up. Any new storage must be manually evaluated and
added to this allowlist if backup is safe and desired.
By default, no app data is backed up. Sensitive items like databases,
shared preferences, and DataStore files are excluded.
To add an item: add a <include> element with appropriate domain/path.
To exclude an item: add an <exclude> element with appropriate domain/path.
-->
<data-extraction-rules> <data-extraction-rules>
<cloud-backup> <cloud-backup>
<exclude domain="sharedpref" path="local_answers" /> <!-- No items included by default - sensitive data only -->
<!-- Explicit exclusions for all default storage types -->
<exclude domain="database" path="." /> <exclude domain="database" path="." />
<exclude domain="sharedpref" path="." />
<exclude domain="file" path="." />
</cloud-backup> </cloud-backup>
<device-transfer> <device-transfer>
<exclude domain="sharedpref" path="local_answers" /> <!-- No items included by default - sensitive data only -->
<!-- Explicit exclusions for all default storage types -->
<exclude domain="database" path="." /> <exclude domain="database" path="." />
<exclude domain="sharedpref" path="." />
<exclude domain="file" path="." />
</device-transfer> </device-transfer>
</data-extraction-rules> </data-extraction-rules>