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obfuz
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Ignore a previous symbol mapping when names are randomised 

Reusing the previous build's mapping returns every pre-existing symbol to its
old name, which silently undoes the randomisation while every build-side check
still passes. Deleting the mapping file before each build worked but left the
guarantee resting on the caller.
pull/36/head
Gabriel Olivato 2026-08-19 18:05:15 +01:00
parent dcf38b3f0f
commit 72397812cd
3 changed files with 18 additions and 5 deletions
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4
Editor/ObfusPasses/SymbolObfus/NameMakers/NameScope.cs
View File

@ -45,12 +45,12 @@ namespace Obfuz.ObfusPasses.SymbolObfus.NameMakers
_wordSet = wordSet; _wordSet = wordSet;
_nextIndex = 0; _nextIndex = 0;
_random = seed != 0 ? new System.Random(seed) : null; _random = seed != 0 ? new System.Random(seed) : null;
int space = 1; long space = 1;
for (int i = 0; i < 4; i++) for (int i = 0; i < 4; i++)
{ {
space *= wordSet.Count; space *= wordSet.Count;
} }
_nameSpace = space; _nameSpace = (int)System.Math.Min(space, int.MaxValue);
} }
protected override void BuildNewName(StringBuilder nameBuilder, string originalName, string lastName) protected override void BuildNewName(StringBuilder nameBuilder, string originalName, string lastName)

15
Editor/ObfusPasses/SymbolObfus/RenameRecordMap.cs
View File

@ -1,4 +1,4 @@
// Copyright 2025 Code Philosophy // Copyright 2025 Code Philosophy
// //
// Permission is hereby granted, free of charge, to any person obtaining a copy // Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal // of this software and associated documentation files (the "Software"), to deal
@ -120,16 +120,29 @@ namespace Obfuz.ObfusPasses.SymbolObfus
private readonly Dictionary<VirtualMethodGroup, RenameRecord> _virtualMethodGroups = new Dictionary<VirtualMethodGroup, RenameRecord>(); private readonly Dictionary<VirtualMethodGroup, RenameRecord> _virtualMethodGroups = new Dictionary<VirtualMethodGroup, RenameRecord>();
private readonly bool _reusePreviousNames;
public RenameRecordMap(string mappingFile, bool debug, bool keepUnknownSymbolInSymbolMappingFile) public RenameRecordMap(string mappingFile, bool debug, bool keepUnknownSymbolInSymbolMappingFile)
: this(mappingFile, debug, keepUnknownSymbolInSymbolMappingFile, true)
{
}
public RenameRecordMap(string mappingFile, bool debug, bool keepUnknownSymbolInSymbolMappingFile, bool reusePreviousNames)
{ {
_mappingFile = mappingFile; _mappingFile = mappingFile;
_debug = debug; _debug = debug;
_keepUnknownSymbolInSymbolMappingFile = keepUnknownSymbolInSymbolMappingFile; _keepUnknownSymbolInSymbolMappingFile = keepUnknownSymbolInSymbolMappingFile;
_reusePreviousNames = reusePreviousNames;
} }
public void Init(List<ModuleDef> assemblies, INameMaker nameMaker) public void Init(List<ModuleDef> assemblies, INameMaker nameMaker)
{
// With a randomised name seed, reusing the previous build's mapping would hand every
// pre-existing symbol its old name back and silently undo the randomisation.
if (_reusePreviousNames)
{ {
LoadXmlMappingFile(_mappingFile); LoadXmlMappingFile(_mappingFile);
}
foreach (ModuleDef mod in assemblies) foreach (ModuleDef mod in assemblies)
{ {
string name = mod.Assembly.Name; string name = mod.Assembly.Name;

2
Editor/ObfusPasses/SymbolObfus/SymbolRename.cs
View File

@ -64,7 +64,7 @@ namespace Obfuz.ObfusPasses.SymbolObfus
_useConsistentNamespaceObfuscation = settings.useConsistentNamespaceObfuscation; _useConsistentNamespaceObfuscation = settings.useConsistentNamespaceObfuscation;
_mappingXmlPath = settings.symbolMappingFile; _mappingXmlPath = settings.symbolMappingFile;
_obfuscationRuleFiles = settings.ruleFiles.ToList(); _obfuscationRuleFiles = settings.ruleFiles.ToList();
_renameRecordMap = new RenameRecordMap(settings.symbolMappingFile, settings.debug, settings.keepUnknownSymbolInSymbolMappingFile); _renameRecordMap = new RenameRecordMap(settings.symbolMappingFile, settings.debug, settings.keepUnknownSymbolInSymbolMappingFile, settings.nameRandomSeed == 0);
_virtualMethodGroupCalculator = new VirtualMethodGroupCalculator(); _virtualMethodGroupCalculator = new VirtualMethodGroupCalculator();
_nameMaker = settings.debug ? NameMakerFactory.CreateDebugNameMaker() : NameMakerFactory.CreateNameMakerBaseASCIICharSet(settings.obfuscatedNamePrefix, settings.nameRandomSeed); _nameMaker = settings.debug ? NameMakerFactory.CreateDebugNameMaker() : NameMakerFactory.CreateNameMakerBaseASCIICharSet(settings.obfuscatedNamePrefix, settings.nameRandomSeed);
_customPolicyTypes = settings.customRenamePolicyTypes; _customPolicyTypes = settings.customRenamePolicyTypes;