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John T. Myers 28e1ff7b40 feat(policy): add deny rules to network policy schema (#822)
* feat(policy): add deny rules to network policy schema

Closes #565

Add L7 deny rules that block specific requests even when allowed by
access presets or explicit allow rules. Deny rules mirror the full
capability set of allow rules (method, path, query params, SQL command)
and take precedence -- if a request matches any deny rule, it is blocked
regardless of allow rules.

This enables the "allow everything except these specific operations"
pattern without enumerating every allowed endpoint. For example, granting
read-write access to GitHub while blocking PR approvals, branch
protection changes, and ruleset modifications.

* fix(policy): deny query matching fails closed, mirror allow-side validation

Addresses PR review findings P1 and P3:

P1: Deny-side query matching now uses fail-closed semantics. If ANY
value for a query key matches the deny matcher, the deny fires. The
previous implementation reused allow-side "all values must match"
logic which allowed ?force=true&force=false to bypass a deny on
force=true.

P3: Deny-side query validation now mirrors the full allow-side checks:
empty any lists, non-string matcher values, glob+any mutual exclusion,
glob type checks, and glob syntax warnings are all validated.
2026-04-14 21:52:14 -07:00
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