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746f3fa4e6
* [bugfix] Ensure requests happen over TCP It's possible for the network to be udp4 or udp6. This is rather unlikely to occur, but since we're given the network anyway as part of the Sanitize function getting called we might as well check for it. * [chore] Align reserved v6 blocks to IANA registry * [chore] Add test for ValidateIP The net and netip packages diverge in that net.ParseIP will consider an IPv4-mapped address to be an IPv4 address and as such it would get caught by the IPv4Reserved list. However, netip considers it an IPv6 address, so we need to ensure the mapped range is in IPv6Reserved. * [chore] Align reserved v4 blocks to IANA registry This includes a number of tests for /32's explicitly called out in the registry to ensure we always consider those invalid.
113 lines
4.7 KiB
Go
113 lines
4.7 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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// IPv6Reserved contains IPv6 reserved IP prefixes.
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// https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml
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IPv6Reserved = [...]netip.Prefix{
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netip.MustParsePrefix("::1/128"), // Loopback
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netip.MustParsePrefix("::/128"), // Unspecified address
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netip.MustParsePrefix("::ffff:0:0/96"), // IPv4-mapped address
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netip.MustParsePrefix("64:ff9b::/96"), // IPv4/IPv6 translation, RFC 6052
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netip.MustParsePrefix("64:ff9b:1::/48"), // IPv4/IPv6 translation, RFC 8215
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netip.MustParsePrefix("100::/64"), // Discard prefix, RFC 6666
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netip.MustParsePrefix("2001::/23"), // IETF Protocol Assignments, RFC 2928
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netip.MustParsePrefix("2001::/32"), // Teredo
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netip.MustParsePrefix("2001:1::1/128"), // Port Control Protocol Anycast, RFC 7723
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netip.MustParsePrefix("2001:1::2/128"), // Traversal Using Relays around NAT Anycast, RFC 8155
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netip.MustParsePrefix("2001:2::/48"), // Benchmarking, RFC 5180
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netip.MustParsePrefix("2001:3::/32"), // AMT, RFC 7450
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netip.MustParsePrefix("2001:4:112::/48"), // AS112-v6, RFC 7535
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netip.MustParsePrefix("2001:10::/28"), // ORCHID, deprecated
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netip.MustParsePrefix("2001:20::/28"), // ORCHIDv2
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netip.MustParsePrefix("2001:db8::/32"), // Test, doc, examples
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netip.MustParsePrefix("2002::/16"), // 6to4
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netip.MustParsePrefix("2620:4f:8000::/48"), // Direct Delegation AS112 Service, RFC 7534
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netip.MustParsePrefix("fc00::/7"), // Unique Local
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netip.MustParsePrefix("fe80::/10"), // Link-local
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netip.MustParsePrefix("fec0::/10"), // Site-local, deprecated
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netip.MustParsePrefix("ff00::/8"), // Multicast
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}
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// IPv4Reserved contains IPv4 reserved IP prefixes.
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// https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
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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("192.0.0.0/29"), // IPv4 Service Continuity Prefix, RFC 7335
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netip.MustParsePrefix("192.0.2.0/24"), // Test, doc, examples
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netip.MustParsePrefix("192.31.196.0/24"), // AS112-v4, RFC 7535
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netip.MustParsePrefix("192.52.193.0/24"), // AMT, RFC 7450
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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("192.175.48.0/24"), // Direct Delegation AS112 Service, RFC 7534
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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 IP in IPv6 reserved nets
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case ip.Is6():
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for _, reserved := range IPv6Reserved {
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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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// 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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