Simplify X.509 CSR processing

[jschlyter]

Summary by CodeRabbit

• New Features

  • Enhanced verification process for Certificate Signing Requests (CSRs) with separated signature and data verification.

• Bug Fixes

  • Improved error handling for CSR verification, ensuring exceptions are raised for invalid signatures and discrepancies in expected data.

• Documentation

  • Streamlined import statements to remove unused functions, improving clarity in the codebase.

[coderabbitai]

Walkthrough

The pull request introduces modifications to the CSR (Certificate Signing Request) verification process across multiple files in the nodeman package. The primary change involves splitting the previous verify_x509_csr function into two separate functions: verify_x509_csr_signature and verify_x509_csr_data. This refactoring separates the signature verification from data validation, improving the modularity of the CSR verification logic while maintaining the core validation checks.

Changes

File	Change Summary
nodeman/internal_ca.py	Updated function call from verify_x509_csr to verify_x509_csr_signature
nodeman/step.py	Updated import to include verify_x509_csr_data and verify_x509_csr_signature
nodeman/x509.py	Removed verify_x509_csr function, modified verify_x509_csr_data to remove validate_name parameter, added new verify_x509_csr_signature function

Sequence Diagram

sequenceDiagram
    participant CSR as Certificate Signing Request
    participant Signature as verify_x509_csr_signature
    participant Data as verify_x509_csr_data
    
    CSR->>Signature: Check signature validity
    Signature-->>CSR: Validate signature
    
    CSR->>Data: Verify CSR contents
    Data-->>CSR: Validate subject and extensions

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Possibly related PRs

• Add internal CA #30: Changes related to updating the verification function in the InternalCertificateAuthority class's sign_csr method

Suggested reviewers

• morkrost

Poem

🐰 Hop, hop, through the code we go,
Splitting functions, watch them grow!
Signatures checked with rabbit might,
CSR verification, now so bright!
A dance of modularity, clean and neat,
Security's rabbit makes the code complete! 🔒

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[coderabbitai]

Actionable comments posted: 2

🧹 Nitpick comments (1)

nodeman/x509.py (1)

Line range hint 87-109: Enhance error messages for better debugging

While the validation logic is solid, the error messages could be more descriptive to aid in troubleshooting.

Consider these improvements:

-        raise CertificateSigningRequestException("Invalid Subject")
+        raise CertificateSigningRequestException(f"Invalid Subject: expected exactly 1 attribute, got {len(csr.subject)}")

-        raise CertificateSigningRequestException("Missing extensions")
+        raise CertificateSigningRequestException("Missing SubjectAlternativeName extension")

-        raise CertificateSigningRequestException("Multiple extensions")
+        raise CertificateSigningRequestException(f"Multiple extensions found: {[ext.oid._name for ext in csr.extensions]}, expected only SubjectAlternativeName")

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between abda24b and 3741d71.

📒 Files selected for processing (3)

• nodeman/internal_ca.py (2 hunks)
• nodeman/step.py (2 hunks)
• nodeman/x509.py (3 hunks)

🔇 Additional comments (2)

nodeman/x509.py (1)

8-11: LGTM! Import changes improve type clarity

The explicit imports of private key types enhance type checking and make the code more maintainable.

nodeman/step.py (1)

42-43: LGTM! Proper CSR validation sequence

The implementation correctly verifies both the CSR signature and data in the proper order.