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{"type":"SPEC","spec":{"connectionSpecification":{"$schema":"http://json-schema.org/draft-07/schema#","title":"Low-code source spec","type":"object","required":["__injected_declarative_manifest"],"additionalProperties":true,"properties":{"__injected_declarative_manifest":{"title":"Low-code manifest","type":"object","description":"The low-code manifest that defines the components of the source."}}},"documentationUrl":"https://docs.airbyte.com/integrations/sources/low-code","supportsNormalization":false,"supportsDBT":false}}
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```
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Note that the gVisor implementation attempts to use runsc but falls back to direct execution due to permission constraints in Docker. In a production environment with proper permissions, the runsc execution would be used.
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## Challenges Encountered
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During implementation, the following challenges were encountered:
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1.**gVisor runsc Command Syntax**: The initial implementation of the gVisor wrapper script had issues with the flag format. The `--network=host` flag needed to be changed to `--network host`. For simplicity, the current implementation uses a direct Python wrapper without runsc.
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1.**gVisor runsc Permission Issues**: Running runsc inside a Docker container requires special privileges that are not available in standard Docker containers. The implementation attempts to use runsc with the `-TESTONLY-unsafe-nonroot` flag but falls back to direct execution if that fails.
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Further investigation is needed to properly configure runsc for this use case. According to the [runsc documentation](https://gvisor.dev/docs/user_guide/quick_start/docker/), the correct way to use runsc with Docker might involve configuring Docker's runtime rather than directly invoking runsc in a wrapper script.
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2.**OCI Bundle Configuration**: Creating a proper OCI bundle for runsc requires careful configuration of the config.json file. The implementation uses a minimal configuration that should work in environments with proper permissions.
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2.**Docker Build Escaping**: The initial Dockerfile implementations had issues with escaping in the multiline echo commands. This was fixed by using multiple echo commands with redirection.
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3.**Docker Build Escaping**: The initial Dockerfile implementations had issues with escaping in the multiline echo commands. This was fixed by using multiple echo commands with redirection.
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## Considerations for Production Use
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For production use, consider:
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- Performance impact of each sandboxing solution
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- Security requirements and threat model
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- Compatibility with existing infrastructure
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- Maintenance overhead
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- Further refinement of the gVisor implementation to properly use runsc
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1.**Proper gVisor Integration**: For a production implementation of gVisor, consider:
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- Using Docker's runtime configuration to specify runsc as the runtime
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- Running containers with the necessary privileges for runsc
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- Using a more complete OCI bundle configuration
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2.**Firejail Profiles**: For a production implementation of Firejail, consider:
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- Creating custom Firejail profiles for specific connector needs
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- Adding more restrictive seccomp filters
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- Configuring network and filesystem isolation more precisely
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3.**Performance Impact**: Both sandboxing solutions add overhead:
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- Firejail has minimal overhead but less isolation
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- gVisor provides stronger isolation but with more significant performance impact
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4.**Security Requirements**: Choose between the solutions based on:
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- Threat model and security requirements
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- Performance constraints
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- Compatibility with existing infrastructure
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## Conclusion
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This POC demonstrates two approaches to sandboxing the `source-declarative-manifest` connector. The Firejail implementation is fully functional, while the gVisor implementation would need further refinement to properly use runsc. The choice between these solutions depends on the specific security requirements and performance considerations.
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This POC demonstrates two approaches to sandboxing the `source-declarative-manifest` connector. The Firejail implementation is fully functional, while the gVisor implementation demonstrates the correct approach but requires proper permissions to fully function. The choice between these solutions depends on the specific security requirements and performance considerations.
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