Spectral OWASP linting rules

[rartych]

What type of PR is this?

• enhancement/feature

What this PR does / why we need it:

This PR adds Spectral OWASP linting rules to be used in reusable linting workflows.

• .spectral-owasp.yaml includes OWASP rules selected in https://github.com/camaraproject/Commonalities/blob/main/documentation/Linting-rules.md
• .spectral-owasp-target.yaml modifies severity of api4 rules to target values
• .spectral-camara.yaml aggregates rulesests (already defined and OWASP) as Megalinter requires only one input parameter for ruleset file
• spectral-oas.yml - refactored workflow for manually launched Spectral linting (including OWASP target ruleset)
• pr_validation.yml - changed ruleset file to .spectral-camara.yaml

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Changelog input

Spectral OWASP linting rules added to reusable linting workflows

Additional documentation

[Kevsy]

@rartych looks good, but why are so many rules excluded (off) by default - was that the outcome of earlier discussions?

[rartych]

why are so many rules excluded (off) by default - was that the outcome of earlier discussions?

Yes I tried to review all the rules in camaraproject/Commonalities#539 and its sub-issues.
The reasons to exclude some rules are:

• CAMARA APIs use advanced Auth schemes (defined by ICM) - not covered in the rules
• some security features are not specified in CAMARA and left to implementation/API Gateway configuration (rate limiting, intended environment in server descriptions using terms like local, staging, production)
• some rules are for OAS 3.1 (they OAS 3.0 counterparts named as -legacy are active)

Of course the selection can be modified if needed.
Other question is: If CAMARA specific rules for OWASP recommendations can be added beyond the official Spectral ruleset?

[Kevsy]

Yes I tried to review all the rules in camaraproject/Commonalities#539 and its sub-issues.

Thanks, I suspected that was the case - but good to confirm.

Other question is: If CAMARA specific rules for OWASP recommendations can be added beyond the official Spectral ruleset?

I believe that should be allowed. If they are rules for existing OWASP recommendations, they could be including in the *owasp*yaml files, if they are complementary security rules they could be included in spectral-camara.yaml