RAG-style attack test and related enhancements

[abutbul]

Overview

This pull request introduces several enhancements to the ps-fuzz testing framework, including a new test, embedding configurations, unit tests, some minor refactoring, and additional dependencies. These changes aim to improve the flexibility of the testing framework.

Changes

A new attack named "Hidden Parrot Attack" demonstrates how malicious instructions can be embedded in vector databases to compromise RAG system behavior. The implementation is located in [rag_poisoning.py]

Embedding Configuration:

• Added support for embedding providers (ollama, open_ai) and models, including configuration for base URLs.
• Embedding-specific base URLs can now be configured independently of the main provider URLs.

Base URL Support:

• Introduced support for configuring base URLs for ollama and open_ai providers. (You can mix and match!)
• Base URLs can be set via the configuration file, command-line arguments, or interactive menus.

Refactoring:

• Refactored provider and model prompts to reduce duplication and improve maintainability.
• Introduced helper functions for building client and embedding configurations.

Added Dependencies

• chromadb: Added for vector database operations in the RAG poisoning attack.
• tiktoken: Added for tokenization support in embedding-related operations.
  • Updated setup.py and pyproject.toml (nodding at legacy package setup) to include the new dependencies.

Impact

The embedding configuration enhancements enable more advanced attack simulations, further strengthening our testing framework. rag_poisoning attack demonstrate easily exploitable vulnerability in many vector-DB backed RAG pipelines.

Testing

• The new test have been integrated into the existing test suite and validated for correctness and performance impact.
• Skipped tests are now properly reported with detailed logs.

P.S. I realize adding skipping status to tests is out of scope, however, I have ran some edge tests with missing libraries/configuration. Test pipeline errors reported as failed(vulnerable) in the default summary view rather than reporting as skipped. There is existing boilerplate for errors(⚠) to avoid breaking legacy, I added skipped. All that said, I may be missing a better way to report.