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…lowercase conversion * Added `Locale.ROOT` for `toLowerCase()` to prevent bypasses using specific casing (e.g. Turkish 'I'). * Stripped trailing dots from domain to prevent FQDN bypasses (e.g. `evil.com.`). * Updated Gradle wrapper and settings to resolve build issues with `JvmVendorSpec IBM_SEMERU`. Co-authored-by: dlukt <201112286+dlukt@users.noreply.github.com>
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Pull request overview
This PR hardens the app’s domain blocklist enforcement by ensuring blocklist entries are normalized consistently (locale-invariant lowercasing and removal of trailing dots), preventing bypasses via locale-dependent casing (e.g., Turkish “I”) or FQDN-style trailing dots. It also adjusts Gradle/toolchain configuration to restore local test/build execution.
Changes:
- Normalize parsed blocklist domains with
toLowerCase(Locale.ROOT)and strip all trailing.before adding to the blocklist. - Bump
foojay-resolver-conventionplugin version insettings.gradle. - Update Gradle wrapper to use a different Gradle distribution (and SHA) for build/test compatibility.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| settings.gradle | Updates toolchain resolver plugin version to improve toolchain/vendor resolution. |
| mastodon/src/main/java/de/icod/techidon/api/MastodonAPIController.java | Normalizes blocklist domain entries (Locale.ROOT + trailing-dot stripping) before lookup. |
| gradle/wrapper/gradle-wrapper.properties | Changes Gradle distribution URL/SHA to a compatible version for local builds/tests. |
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| if (line.isBlank() || line.startsWith("#")) continue; | ||
| String[] parts = line.replaceAll("\"", "").split("[\s,;]"); | ||
| if (parts.length == 0) continue; | ||
| String domain = parts[0].toLowerCase().trim(); | ||
| String domain = parts[0].toLowerCase(Locale.ROOT).trim(); | ||
| while (domain.endsWith(".")) { | ||
| domain = domain.substring(0, domain.length() - 1); | ||
| } |
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blocks.txt is read via a BufferedReader created above this loop, but the reader is never closed. Please wrap the reader creation + this read loop in a try-with-resources (or ensure close in finally) to avoid leaking the underlying AssetInputStream/file descriptor. |
Good catch! I've wrapped the |
* Prevent file descriptor leakage by ensuring the BufferedReader and underlying AssetInputStream are safely closed via try-with-resources. Co-authored-by: dlukt <201112286+dlukt@users.noreply.github.com>
🚨 Severity: HIGH
💡 Vulnerability: The domain blocklist in
MastodonAPIControllerusedtoLowerCase()withoutLocale.ROOTand failed to strip trailing dots. This could allow attackers to bypass the blocklist using locales where lowercase conversion of characters like 'I' behaves differently (e.g., Turkish 'I'), or by appending a trailing dot to the domain (a Fully Qualified Domain Name format that DNS resolves but string matching misses).🎯 Impact: Attackers could cause the app to communicate with blocked domains by sending seemingly innocuous domains that fail string equality matching but resolve identically at the DNS/network level.
🔧 Fix:
toLowerCase()withtoLowerCase(Locale.ROOT)to enforce locale-independent case conversion.whileloop to strip all trailing.characters from parsed domains before adding them to thebadDomainsset.gradle-wrapper.propertiesandsettings.gradle) to fix local test execution failures caused by a missing JVM vendor enum (IBM_SEMERU).✅ Verification: Ran
./gradlew :mastodon:testDebugUnitTestand./gradlew :mastodon:assembleDebugsuccessfully. The blocklist correctly parses and neutralizes test domains with trailing dots or unusual case structures.PR created automatically by Jules for task 9987004677809382764 started by @dlukt