📝 Docs / Security threat-model + advisory process (#43)#48
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Closes #43.
Adds a written security boundary + disclosure process — documents (and makes auditable) the protections already implemented.
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SECURITY.md— supported versions, private reporting channel, threat-model table (XXE/entity-expansion, signature forgery, weak algorithms, key substitution via documentKeyInfo, issuer/audience/recipient/destination, time-based replay), the trust boundary statement (trust is bound to configured IdP fingerprints, never document-suppliedKeyInfo), the algorithm policy (RSA-SHA256 accepted / RSA-SHA1 rejected), non-goals (SP-only; no IdP/OIDC), and coordinated-disclosure.docs/advisories/TEMPLATE.md— CVE-style write-up template.All statements were checked against the code on
main(allow_entities: falsesites;DsigRSA-SHA1 rejection + fingerprint binding). The doc also links the in-progress hardening (#39 XSW, #38 corpus, #32 centralisation) as explicitly not-yet-complete.Docs only — no code changes.