Relay trusted proxies - #98
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Add --trusted-proxy (repeatable / CERTRELAY_TRUSTED_PROXIES, IP or CIDR). When set, the --remote-ip-header value is only honored for connections whose socket peer falls in a trusted range — so a directly-reachable origin can't be used to spoof e.g. cf-connecting-ip past the per-IP rate limits. When unset (default), the header is trusted from any peer, so existing relays that rely on a Cloudflare-only firewall are unaffected.
Add --rate-limit-allow (repeatable / CERTRELAY_RATE_LIMIT_ALLOW, exact IPs). Listed IPs skip every per-IP rate limiter and don't consume a token, so they can't be starved. The match is against the resolved client IP, so behind a proxy it inherits --trusted-proxy spoof-resistance. Empty (default) = everyone is limited, unchanged.
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