79 lines
2.6 KiB
Go
79 lines
2.6 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package netutil
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import (
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"net/netip"
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)
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var (
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// IPv6GlobalUnicast is the global IPv6 unicast IP prefix.
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IPv6GlobalUnicast = netip.MustParsePrefix("ff00::/8")
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// IPvReserved contains IPv4 reserved IP prefixes.
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IPv4Reserved = [...]netip.Prefix{
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netip.MustParsePrefix("0.0.0.0/8"), // Current network
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netip.MustParsePrefix("10.0.0.0/8"), // Private
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netip.MustParsePrefix("100.64.0.0/10"), // RFC6598
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netip.MustParsePrefix("127.0.0.0/8"), // Loopback
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netip.MustParsePrefix("169.254.0.0/16"), // Link-local
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netip.MustParsePrefix("172.16.0.0/12"), // Private
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netip.MustParsePrefix("192.0.0.0/24"), // RFC6890
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netip.MustParsePrefix("192.0.2.0/24"), // Test, doc, examples
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netip.MustParsePrefix("192.88.99.0/24"), // IPv6 to IPv4 relay
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netip.MustParsePrefix("192.168.0.0/16"), // Private
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netip.MustParsePrefix("198.18.0.0/15"), // Benchmarking tests
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netip.MustParsePrefix("198.51.100.0/24"), // Test, doc, examples
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netip.MustParsePrefix("203.0.113.0/24"), // Test, doc, examples
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netip.MustParsePrefix("224.0.0.0/4"), // Multicast
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netip.MustParsePrefix("240.0.0.0/4"), // Reserved (includes broadcast / 255.255.255.255)
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}
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)
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// ValidateAddr will parse a netip.AddrPort from string, and return the result of ValidateIP() on addr.
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func ValidateAddr(s string) bool {
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ipport, err := netip.ParseAddrPort(s)
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if err != nil {
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return false
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}
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return ValidateIP(ipport.Addr())
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}
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// ValidateIP returns whether IP is an IPv4/6 address in non-reserved, public ranges.
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func ValidateIP(ip netip.Addr) bool {
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switch {
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// IPv4: check if IPv4 in reserved nets
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case ip.Is4():
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for _, reserved := range IPv4Reserved {
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if reserved.Contains(ip) {
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return false
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}
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}
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return true
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// IPv6: check if in global unicast (public internet)
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case ip.Is6():
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return IPv6GlobalUnicast.Contains(ip)
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// Assume malicious by default
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default:
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return false
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}
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}
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