Fix array/hash unknown index handling

[presidentbeef]

E.g. [1,2,3][x] should be treated as returning a safe (although unknown) literal.

[dryrunsecurity]

DryRun Security Summary

The pull request aims to improve the functionality and robustness of an application security tool by refactoring and enhancing the AliasProcessor class's ability to analyze Ruby code more accurately and efficiently.

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Summary:

The code changes in this pull request appear to be focused on improving the functionality and robustness of an application security tool or framework, specifically the AliasProcessor class. The changes include updates to the test suite for the AliasProcessor class, as well as refactoring and improvements to the core processing logic.

From a security perspective, the changes are primarily focused on enhancing the ability of the AliasProcessor to accurately analyze and process Ruby code, which is crucial for identifying potential security vulnerabilities. The test suite covers a wide range of language constructs and edge cases, ensuring that the AliasProcessor can handle various scenarios that may arise in real-world applications.

The refactoring of the AliasProcessor class also aims to improve the overall performance and maintainability of the tool, which can indirectly benefit the security analysis capabilities. However, the changes do not directly address any specific security vulnerabilities, but rather focus on improving the underlying functionality of the tool.

Files Changed:

1. test/tests/alias_processor.rb: This file contains a comprehensive test suite for the AliasProcessor class, covering various scenarios related to array indexing, hash handling, control flow analysis, string manipulation, and the core functionality of the AliasProcessor itself. These tests are crucial for ensuring the reliability and accuracy of the security analysis performed by the tool.

2. lib/brakeman/processors/alias_processor.rb: This file contains the implementation of the Brakeman::AliasProcessor class, which is responsible for processing Ruby code and replacing variable aliases with their actual values. The changes in this file focus on improving the handling of various Ruby language constructs, such as array and hash access, method calls, and control flow statements. These improvements can enhance the ability of the tool to accurately analyze the flow of data through an application, which is essential for identifying potential security vulnerabilities.

Overall, the changes in this pull request appear to be focused on improving the functionality and robustness of an application security tool or framework, with a particular emphasis on enhancing the accuracy and performance of the AliasProcessor component. While the changes do not directly address any specific security vulnerabilities, they can indirectly contribute to the overall effectiveness of the security analysis performed by the tool.

Code Analysis

We ran 9 analyzers against 2 files and 0 analyzers had findings. 9 analyzers had no findings.

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