4c57d201a4
The source headers, LICENSE files, and license metadata had drifted apart. Align the entire project to MIT: - Convert every source-file header to the MIT text across all comment styles (Go, TS, TSX, JS, MJS, SQL, CSS, GraphQL, shell), including SPDX-License-Identifier tags - Set the root and cookie-banner LICENSE files to the MIT text with a "MIT License" title line - Switch the package.json license fields, Docker image label, and cookie-banner README to MIT - Update docs and the genmodels header generator accordingly - Normalize copyright lines to a single format (Copyright (c) <year(s)> Probo Inc <hello@probo.com>.): unify the hello@getprobo.com and hello@probo.inc emails to hello@probo.com and the comma-separated years to a hyphenated range Genuine third-party references are intentionally left untouched: the Lucide icon attributions (Lucide is ISC) and the trivy dependency license allowlist. Signed-off-by: Sacha Al Himdani <sacha@probo.com>
113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package trustedproxy
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import (
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"fmt"
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"net"
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"net/http"
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"strings"
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)
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var forwardedHeaders = []string{
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"Forwarded",
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"X-Forwarded-For",
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}
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// NewMiddleware returns an HTTP middleware that strips forwarded
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// headers from requests that did not originate from one of the given
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// trusted proxies. Each entry in trusted may be either a single IP
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// address (e.g. "10.0.0.1") or a CIDR range (e.g. "10.0.0.0/24").
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// When the list is empty every request is treated as untrusted and
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// the headers are always removed. An error is returned if any entry
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// is neither a valid IP nor a valid CIDR.
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func NewMiddleware(trusted []string) (func(http.Handler) http.Handler, error) {
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ips, nets, err := parseTrusted(trusted)
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if err != nil {
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return nil, err
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}
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if !isTrusted(r.RemoteAddr, ips, nets) {
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for _, h := range forwardedHeaders {
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r.Header.Del(h)
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}
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}
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next.ServeHTTP(w, r)
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})
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}, nil
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}
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func parseTrusted(trusted []string) ([]net.IP, []*net.IPNet, error) {
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ips := make([]net.IP, 0, len(trusted))
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nets := make([]*net.IPNet, 0, len(trusted))
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for _, entry := range trusted {
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if strings.Contains(entry, "/") {
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_, ipNet, err := net.ParseCIDR(entry)
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if err != nil {
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return nil, nil, fmt.Errorf("cannot parse CIDR %q: %w", entry, err)
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}
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nets = append(nets, ipNet)
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continue
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}
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ip := net.ParseIP(entry)
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if ip == nil {
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return nil, nil, fmt.Errorf("cannot parse IP address %q", entry)
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}
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ips = append(ips, ip)
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}
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return ips, nets, nil
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}
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func isTrusted(remoteAddr string, ips []net.IP, nets []*net.IPNet) bool {
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host, _, err := net.SplitHostPort(remoteAddr)
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if err != nil {
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host = remoteAddr
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}
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ip := net.ParseIP(host)
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if ip == nil {
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return false
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}
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for _, t := range ips {
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if t.Equal(ip) {
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return true
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}
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}
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for _, n := range nets {
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if n.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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