gotosocial/internal/netutil/validate.go
Daenney 5e2bf0bdca
[chore] Improve copyright header handling ()
* [chore] Remove years from all license headers

Years or year ranges aren't required in license headers. Many projects
have removed them in recent years and it avoids a bit of yearly toil.

In many cases our copyright claim was also a bit dodgy since we added
the 2021-2023 header to files created after 2021 but you can't claim
copyright into the past that way.

* [chore] Add license header check

This ensures a license header is always added to any new file. This
avoids maintainers/reviewers needing to remember to check for and ask
for it in case a contribution doesn't include it.

* [chore] Add missing license headers

* [chore] Further updates to license header

* Use the more common // indentend comment format
* Remove the hack we had for the linter now that we use the // format
* Add SPDX license identifier
2023-03-12 16:00:57 +01:00

102 lines
4 KiB
Go

// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// 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 <http://www.gnu.org/licenses/>.
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
}
}