/* GoToSocial Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program. If not, see . */ package netutil import ( "net/netip" ) var ( // IPv6Reserved contains IPv6 reserved IP prefixes. // https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml IPv6Reserved = [...]netip.Prefix{ netip.MustParsePrefix("::1/128"), // Loopback netip.MustParsePrefix("::/128"), // Unspecified address netip.MustParsePrefix("::ffff:0:0/96"), // IPv4-mapped address netip.MustParsePrefix("64:ff9b::/96"), // IPv4/IPv6 translation, RFC 6052 netip.MustParsePrefix("64:ff9b:1::/48"), // IPv4/IPv6 translation, RFC 8215 netip.MustParsePrefix("100::/64"), // Discard prefix, RFC 6666 netip.MustParsePrefix("2001::/23"), // IETF Protocol Assignments, RFC 2928 netip.MustParsePrefix("2001:db8::/32"), // Test, doc, examples netip.MustParsePrefix("2002::/16"), // 6to4 netip.MustParsePrefix("2620:4f:8000::/48"), // Direct Delegation AS112 Service, RFC 7534 netip.MustParsePrefix("fc00::/7"), // Unique Local netip.MustParsePrefix("fe80::/10"), // Link-local netip.MustParsePrefix("fec0::/10"), // Site-local, deprecated netip.MustParsePrefix("ff00::/8"), // Multicast } // IPv4Reserved contains IPv4 reserved IP prefixes. // https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml IPv4Reserved = [...]netip.Prefix{ netip.MustParsePrefix("0.0.0.0/8"), // Current network netip.MustParsePrefix("10.0.0.0/8"), // Private netip.MustParsePrefix("100.64.0.0/10"), // RFC6598 netip.MustParsePrefix("127.0.0.0/8"), // Loopback netip.MustParsePrefix("169.254.0.0/16"), // Link-local netip.MustParsePrefix("172.16.0.0/12"), // Private netip.MustParsePrefix("192.0.0.0/24"), // RFC6890 netip.MustParsePrefix("192.0.2.0/24"), // Test, doc, examples netip.MustParsePrefix("192.31.196.0/24"), // AS112-v4, RFC 7535 netip.MustParsePrefix("192.52.193.0/24"), // AMT, RFC 7450 netip.MustParsePrefix("192.88.99.0/24"), // IPv6 to IPv4 relay netip.MustParsePrefix("192.168.0.0/16"), // Private netip.MustParsePrefix("192.175.48.0/24"), // Direct Delegation AS112 Service, RFC 7534 netip.MustParsePrefix("198.18.0.0/15"), // Benchmarking tests netip.MustParsePrefix("198.51.100.0/24"), // Test, doc, examples netip.MustParsePrefix("203.0.113.0/24"), // Test, doc, examples netip.MustParsePrefix("224.0.0.0/4"), // Multicast netip.MustParsePrefix("240.0.0.0/4"), // Reserved (includes broadcast / 255.255.255.255) } ) // ValidateAddr will parse a netip.AddrPort from string, and return the result of ValidateIP() on addr. func ValidateAddr(s string) bool { ipport, err := netip.ParseAddrPort(s) if err != nil { return false } return ValidateIP(ipport.Addr()) } // ValidateIP returns whether IP is an IPv4/6 address in non-reserved, public ranges. func ValidateIP(ip netip.Addr) bool { switch { // IPv4: check if IPv4 in reserved nets case ip.Is4(): for _, reserved := range IPv4Reserved { if reserved.Contains(ip) { return false } } return true // IPv6: check if IP in IPv6 reserved nets case ip.Is6(): for _, reserved := range IPv6Reserved { if reserved.Contains(ip) { return false } } return true // Assume malicious by default default: return false } }