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Encrypt three sensitive secrets that were stored in plaintext: OIDC client_secret, SMTP smtp_password, TOTP totp_secret. AES-256-GCM via pm-core::crypto helper. New per-install key at /etc/patch-manager/keys/secret-encryption.key, separate from health-check.key for blast-radius isolation. MASKED placeholder behavior in API responses is preserved.
23 files changed, +1248 / -28. Closes#6.
Hardens the IP allowlist in require_auth against the two bypasses filed in #3.
1. Bypass via missing X-Forwarded-For (no IP to check, allowlist skipped).
2. Spoofing via attacker-controlled X-Forwarded-For (header trusted unconditionally).
Resolves both by deriving the client IP from the socket peer (ConnectInfo<SocketAddr>) and only honoring X-Forwarded-For when the immediate peer is in a new security.trusted_proxies allowlist (default empty = strict). Fails closed with 403 forbidden_ip when a non-empty allowlist is configured and the client IP cannot be determined. Empty ip_whitelist continues to mean allow all (preserved for dev installs).
27 pm-auth tests pass (12 new resolver + 8 new middleware + 7 existing). Spec: tasks/ip-allowlist-spec.md.
