mirror of
https://github.com/strukturag/nextcloud-spreed-signaling
synced 2026-03-14 14:35:44 +01:00
93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
/**
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* Standalone signaling server for the Nextcloud Spreed app.
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* Copyright (C) 2026 struktur AG
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*
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* @author Joachim Bauch <bauch@struktur.de>
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*
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* @license GNU AGPL version 3 or any later version
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*
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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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*
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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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*
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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 client
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import (
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"net"
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"net/http"
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"slices"
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"strings"
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"github.com/strukturag/nextcloud-spreed-signaling/v2/container"
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)
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var (
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DefaultTrustedProxies = container.DefaultPrivateIPs()
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)
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func GetRealUserIP(r *http.Request, trusted *container.IPList) string {
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addr := r.RemoteAddr
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if host, _, err := net.SplitHostPort(addr); err == nil {
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addr = host
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}
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ip := net.ParseIP(addr)
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if len(ip) == 0 {
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return addr
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}
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// Don't check any headers if the server can be reached by untrusted clients directly.
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if trusted == nil || !trusted.Contains(ip) {
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return addr
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}
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if realIP := r.Header.Get("X-Real-IP"); realIP != "" {
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if ip := net.ParseIP(realIP); len(ip) > 0 {
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return realIP
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}
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}
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// See https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For#selecting_an_ip_address
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forwarded := strings.Split(strings.Join(r.Header.Values("X-Forwarded-For"), ","), ",")
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if len(forwarded) > 0 {
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slices.Reverse(forwarded)
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var lastTrusted string
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for _, hop := range forwarded {
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hop = strings.TrimSpace(hop)
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// Make sure to remove any port.
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if host, _, err := net.SplitHostPort(hop); err == nil {
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hop = host
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}
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ip := net.ParseIP(hop)
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if len(ip) == 0 {
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continue
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}
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if trusted.Contains(ip) {
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lastTrusted = hop
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continue
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}
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return hop
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}
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// If all entries in the "X-Forwarded-For" list are trusted, the left-most
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// will be the client IP. This can happen if a subnet is trusted and the
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// client also has an IP from this subnet.
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if lastTrusted != "" {
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return lastTrusted
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}
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}
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return addr
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}
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