| 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158 | 1x
1x
1x
1x
1x
1x
1x
1x
1x
1x
1x
1x
1x
2622x
2622x
2622x
2622x
2622x
3x
2619x
2619x
2619x
3618x
2619x
2619x
2619x
2619x
2619x
2619x
495400x
495400x
163732x
| import { injectable, inject } from 'inversify';
import { ServiceIdentifiers } from './container/ServiceIdentifiers';
import * as estraverse from 'estraverse';
import * as ESTree from 'estree';
import { TNodeTransformersFactory } from './types/container/TNodeTransformersFactory';
import { TVisitorDirection } from './types/TVisitorDirection';
import { ICustomNode } from './interfaces/custom-nodes/ICustomNode';
import { IObfuscationEventEmitter } from './interfaces/event-emitters/IObfuscationEventEmitter';
import { IObfuscator } from './interfaces/IObfuscator';
import { IOptions } from './interfaces/options/IOptions';
import { INodeTransformer } from './interfaces/node-transformers/INodeTransformer';
import { IStackTraceAnalyzer } from './interfaces/stack-trace-analyzer/IStackTraceAnalyzer';
import { IStorage } from './interfaces/storages/IStorage';
import { NodeTransformers } from './enums/container/NodeTransformers';
import { NodeType } from './enums/NodeType';
import { ObfuscationEvents } from './enums/ObfuscationEvents';
import { VisitorDirection } from './enums/VisitorDirection';
import { Node } from './node/Node';
import { NodeUtils } from './node/NodeUtils';
@injectable()
export class Obfuscator implements IObfuscator {
/**
* @type {Map<string, NodeTransformers[]>}
*/
private static readonly nodeControlFlowTransformersMap: Map <string, NodeTransformers[]> = new Map <string, NodeTransformers[]> ([
[NodeType.FunctionDeclaration, [NodeTransformers.FunctionControlFlowTransformer]],
[NodeType.FunctionExpression, [NodeTransformers.FunctionControlFlowTransformer]]
]);
/**
* @type {Map<string, NodeTransformers[]>}
*/
private static readonly nodeObfuscatorsMap: Map <string, NodeTransformers[]> = new Map <string, NodeTransformers[]> ([
[NodeType.ArrowFunctionExpression, [NodeTransformers.FunctionObfuscator]],
[NodeType.ClassDeclaration, [NodeTransformers.FunctionDeclarationObfuscator]],
[NodeType.CatchClause, [NodeTransformers.CatchClauseObfuscator]],
[NodeType.FunctionDeclaration, [
NodeTransformers.FunctionDeclarationObfuscator,
NodeTransformers.FunctionObfuscator
]],
[NodeType.FunctionExpression, [NodeTransformers.FunctionObfuscator]],
[NodeType.MemberExpression, [NodeTransformers.MemberExpressionObfuscator]],
[NodeType.MethodDefinition, [NodeTransformers.MethodDefinitionObfuscator]],
[NodeType.ObjectExpression, [NodeTransformers.ObjectExpressionObfuscator]],
[NodeType.VariableDeclaration, [NodeTransformers.VariableDeclarationObfuscator]],
[NodeType.LabeledStatement, [NodeTransformers.LabeledStatementObfuscator]],
[NodeType.Literal, [NodeTransformers.LiteralObfuscator]]
]);
/**
* @type {TNodeTransformersFactory}
*/
private readonly nodeTransformersFactory: TNodeTransformersFactory;
/**
* @type {IObfuscationEventEmitter}
*/
private readonly obfuscationEventEmitter: IObfuscationEventEmitter;
/**
* @type {IOptions}
*/
private readonly options: IOptions;
/**
* @type {IStackTraceAnalyzer}
*/
private readonly stackTraceAnalyzer: IStackTraceAnalyzer;
/**
* @param stackTraceAnalyzer
* @param obfuscationEventEmitter
* @param nodeTransformersFactory
* @param options
*/
constructor (
@inject(ServiceIdentifiers.IStackTraceAnalyzer) stackTraceAnalyzer: IStackTraceAnalyzer,
@inject(ServiceIdentifiers.IObfuscationEventEmitter) obfuscationEventEmitter: IObfuscationEventEmitter,
@inject(ServiceIdentifiers['Factory<INodeTransformer[]>']) nodeTransformersFactory: TNodeTransformersFactory,
@inject(ServiceIdentifiers.IOptions) options: IOptions
) {
this.stackTraceAnalyzer = stackTraceAnalyzer;
this.obfuscationEventEmitter = obfuscationEventEmitter;
this.nodeTransformersFactory = nodeTransformersFactory;
this.options = options;
}
/**
* @param astTree
* @param customNodesStorage
* @returns {ESTree.Program}
*/
public obfuscateAstTree (astTree: ESTree.Program, customNodesStorage: IStorage<ICustomNode>): ESTree.Program {
if (Node.isProgramNode(astTree) && !astTree.body.length) {
return astTree;
}
NodeUtils.parentize(astTree);
// prepare custom nodes
customNodesStorage.initialize(this.stackTraceAnalyzer.analyze(astTree.body));
customNodesStorage
.getStorage()
.forEach((customNode: ICustomNode) => {
this.obfuscationEventEmitter.once(customNode.getAppendEvent(), customNode.appendNode.bind(customNode));
});
this.obfuscationEventEmitter.emit(ObfuscationEvents.BeforeObfuscation, astTree);
// first pass: control flow flattening
Iif (this.options.controlFlowFlattening) {
this.transformAstTree(
astTree,
VisitorDirection.leave,
this.nodeTransformersFactory(Obfuscator.nodeControlFlowTransformersMap)
);
}
// second pass: nodes obfuscation
this.transformAstTree(
astTree,
VisitorDirection.enter,
this.nodeTransformersFactory(Obfuscator.nodeObfuscatorsMap)
);
this.obfuscationEventEmitter.emit(ObfuscationEvents.AfterObfuscation, astTree);
return astTree;
}
/**
* @param astTree
* @param direction
* @param nodeTransformersConcreteFactory
*/
private transformAstTree (
astTree: ESTree.Program,
direction: TVisitorDirection,
nodeTransformersConcreteFactory: (nodeType: string) => INodeTransformer[]
): void {
estraverse.traverse(astTree, {
[direction]: (node: ESTree.Node, parentNode: ESTree.Node): void => {
const nodeTransformers: INodeTransformer[] = nodeTransformersConcreteFactory(node.type);
nodeTransformers.forEach((nodeTransformer: INodeTransformer) => {
nodeTransformer.transformNode(node, parentNode);
});
}
});
}
}
|