95 lines
2.4 KiB
Go
95 lines
2.4 KiB
Go
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// Copyright 2021 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package hostmatcher
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import (
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"net"
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"path/filepath"
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"strings"
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"code.gitea.io/gitea/modules/util"
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)
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// HostMatchList is used to check if a host or IP is in a list.
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// If you only need to do wildcard matching, consider to use modules/matchlist
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type HostMatchList struct {
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hosts []string
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ipNets []*net.IPNet
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}
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// MatchBuiltinAll all hosts are matched
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const MatchBuiltinAll = "*"
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// MatchBuiltinExternal A valid non-private unicast IP, all hosts on public internet are matched
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const MatchBuiltinExternal = "external"
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// MatchBuiltinPrivate RFC 1918 (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and RFC 4193 (FC00::/7). Also called LAN/Intranet.
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const MatchBuiltinPrivate = "private"
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// MatchBuiltinLoopback 127.0.0.0/8 for IPv4 and ::1/128 for IPv6, localhost is included.
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const MatchBuiltinLoopback = "loopback"
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// ParseHostMatchList parses the host list HostMatchList
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func ParseHostMatchList(hostList string) *HostMatchList {
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hl := &HostMatchList{}
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for _, s := range strings.Split(hostList, ",") {
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s = strings.ToLower(strings.TrimSpace(s))
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if s == "" {
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continue
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}
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_, ipNet, err := net.ParseCIDR(s)
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if err == nil {
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hl.ipNets = append(hl.ipNets, ipNet)
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} else {
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hl.hosts = append(hl.hosts, s)
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}
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}
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return hl
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}
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// MatchesHostOrIP checks if the host or IP matches an allow/deny(block) list
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func (hl *HostMatchList) MatchesHostOrIP(host string, ip net.IP) bool {
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var matched bool
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host = strings.ToLower(host)
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ipStr := ip.String()
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loop:
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for _, hostInList := range hl.hosts {
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switch hostInList {
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case "":
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continue
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case MatchBuiltinAll:
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matched = true
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break loop
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case MatchBuiltinExternal:
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if matched = ip.IsGlobalUnicast() && !util.IsIPPrivate(ip); matched {
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break loop
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}
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case MatchBuiltinPrivate:
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if matched = util.IsIPPrivate(ip); matched {
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break loop
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}
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case MatchBuiltinLoopback:
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if matched = ip.IsLoopback(); matched {
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break loop
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}
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default:
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if matched, _ = filepath.Match(hostInList, host); matched {
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break loop
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}
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if matched, _ = filepath.Match(hostInList, ipStr); matched {
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break loop
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}
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}
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}
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if !matched {
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for _, ipNet := range hl.ipNets {
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if matched = ipNet.Contains(ip); matched {
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break
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}
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}
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}
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return matched
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}
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