clientIP: add trustedproxy, return first untrusted IP instead of the last one #2892
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We cannot trust any IP not included in $conf['trustedproxy'].
…last one This fixes #2828, where malicious clients passed in customized HTTP header to keep its IP address off records. This is inspired by Sympony's Request::setTrustedProxies, but I don't want to implement everything including IP CIDR matching (IPv4 + IPv6), so I decided to reuse the local IP checker in place powered by regexp. Now admins can customize this "local" (trusted) proxy list using $conf['trustedproxy'], and by default it will allow any local IPs. If in the future there is a need to implement array-based CIDR matching, $conf['trustedproxies'] can be used for the new config name.
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This fixes #2828, where malicious clients passed in customized HTTP header to keep its IP address off records.
This is inspired by Sympony's Request::setTrustedProxies, but I don't want to implement everything including IP CIDR matching (IPv4 + IPv6), so I decided to reuse the local IP checker in place powered by regexp. Now admins can customize this "local" (trusted) proxy list using $conf['trustedproxy'], and by default it will allow any local IPs.
If in the future there is a need to implement array-based CIDR matching, $conf['trustedproxies'] can be used for the new config name.