92466129ec
* Improve URL validation for external wiki and external issues * Do not allow also localhost address for external URLs
78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
// Copyright 2018 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 validation
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import (
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"net"
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"net/url"
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"strings"
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"code.gitea.io/gitea/modules/setting"
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)
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var loopbackIPBlocks []*net.IPNet
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func init() {
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for _, cidr := range []string{
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"127.0.0.0/8", // IPv4 loopback
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"::1/128", // IPv6 loopback
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} {
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if _, block, err := net.ParseCIDR(cidr); err == nil {
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loopbackIPBlocks = append(loopbackIPBlocks, block)
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}
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}
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}
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func isLoopbackIP(ip string) bool {
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pip := net.ParseIP(ip)
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if pip == nil {
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return false
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}
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for _, block := range loopbackIPBlocks {
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if block.Contains(pip) {
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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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// IsValidURL checks if URL is valid
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func IsValidURL(uri string) bool {
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if u, err := url.ParseRequestURI(uri); err != nil ||
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(u.Scheme != "http" && u.Scheme != "https") ||
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!validPort(portOnly(u.Host)) {
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return false
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}
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return true
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}
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// IsAPIURL checks if URL is current Gitea instance API URL
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func IsAPIURL(uri string) bool {
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return strings.HasPrefix(strings.ToLower(uri), strings.ToLower(setting.AppURL+"api"))
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}
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// IsValidExternalURL checks if URL is valid external URL
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func IsValidExternalURL(uri string) bool {
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if !IsValidURL(uri) || IsAPIURL(uri) {
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return false
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}
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u, err := url.ParseRequestURI(uri)
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if err != nil {
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return false
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}
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// Currently check only if not loopback IP is provided to keep compatibility
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if isLoopbackIP(u.Hostname()) || strings.ToLower(u.Hostname()) == "localhost" {
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return false
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}
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// TODO: Later it should be added to allow local network IP addreses
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// only if allowed by special setting
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return true
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}
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