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116 lines
3.0 KiB
116 lines
3.0 KiB
// Copyright 2020 Lauris BH. 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 proxy
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import (
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"net"
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)
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// ForwardedHeadersOptions represents options for forwarded header middleware
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type ForwardedHeadersOptions struct {
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// ForwardLimit limits the number of entries in the headers that will be processed.
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// The default value is 1. Set to 0 to disable the limit.
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ForwardLimit int
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// TrustingAllProxies option sets to trust all proxies.
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TrustingAllProxies bool
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// KnownProxies represents addresses of trusted proxies.
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TrustedProxies []net.IP
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// TrustedNetworks represents addresses of trusted networks.
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TrustedNetworks []*net.IPNet
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}
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var defaultOptions = &ForwardedHeadersOptions{
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ForwardLimit: 1,
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TrustedProxies: []net.IP{
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net.IPv4(127, 0, 0, 1),
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},
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}
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// NewForwardedHeadersOptions creates new middleware options
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func NewForwardedHeadersOptions() *ForwardedHeadersOptions {
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return &ForwardedHeadersOptions{
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ForwardLimit: defaultOptions.ForwardLimit,
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TrustedProxies: defaultOptions.TrustedProxies,
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TrustedNetworks: defaultOptions.TrustedNetworks,
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}
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}
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// WithForwardLimit sets number of entries to be processed
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func (opts *ForwardedHeadersOptions) WithForwardLimit(limit int) *ForwardedHeadersOptions {
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opts.ForwardLimit = limit
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return opts
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}
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// TrustAllProxies sets to trust all proxies
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func (opts *ForwardedHeadersOptions) TrustAllProxies() *ForwardedHeadersOptions {
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opts.TrustingAllProxies = true
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return opts
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}
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// ClearTrustedProxies clears trusted proxy list
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func (opts *ForwardedHeadersOptions) ClearTrustedProxies() *ForwardedHeadersOptions {
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opts.TrustingAllProxies = false
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opts.TrustedProxies = make([]net.IP, 0)
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return opts
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}
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// AddTrustedProxy adds proxy IP to trusted proxy list
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func (opts *ForwardedHeadersOptions) AddTrustedProxy(ip string) *ForwardedHeadersOptions {
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// Special option to trust all proxies if IP address is set as wildcard
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if ip == "*" {
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opts.TrustingAllProxies = true
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return opts
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}
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ipaddr := net.ParseIP(ip)
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if ipaddr == nil {
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return opts
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}
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opts.TrustedProxies = append(opts.TrustedProxies, ipaddr)
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return opts
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}
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// ClearTrustedNetworks clears trusted network list
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func (opts *ForwardedHeadersOptions) ClearTrustedNetworks() *ForwardedHeadersOptions {
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opts.TrustedNetworks = make([]*net.IPNet, 0)
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return opts
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}
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// AddTrustedNetwork adds network to trusted network list
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func (opts *ForwardedHeadersOptions) AddTrustedNetwork(cidr string) *ForwardedHeadersOptions {
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_, netmask, err := net.ParseCIDR(cidr)
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if err != nil || netmask == nil {
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return opts
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}
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opts.TrustedNetworks = append(opts.TrustedNetworks, netmask)
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return opts
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}
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func (opts *ForwardedHeadersOptions) isTrustedProxy(ip net.IP) bool {
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if opts.TrustingAllProxies {
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return true
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}
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if ip == nil {
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return false
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}
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for _, tip := range opts.TrustedProxies {
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if tip.Equal(ip) {
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return true
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}
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}
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for _, tnet := range opts.TrustedNetworks {
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if tnet.Contains(ip) {
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return true
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}
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}
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return false
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}
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