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forgejo/modules/hostmatcher/http.go
Giteabot dab40cd5f4
Support allowed hosts for webhook to work with proxy (#27655) (#27675)
Backport #27655 by @wolfogre

When `webhook.PROXY_URL` has been set, the old code will check if the
proxy host is in `ALLOWED_HOST_LIST` or reject requests through the
proxy. It requires users to add the proxy host to `ALLOWED_HOST_LIST`.
However, it actually allows all requests to any port on the host, when
the proxy host is probably an internal address.

But things may be even worse. `ALLOWED_HOST_LIST` doesn't really work
when requests are sent to the allowed proxy, and the proxy could forward
them to any hosts.

This PR fixes it by:

- If the proxy has been set, always allow connectioins to the host and
port.
- Check `ALLOWED_HOST_LIST` before forwarding.

Co-authored-by: Jason Song <i@wolfogre.com>
2023-10-18 15:07:52 +02:00

70 lines
2.6 KiB
Go

// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package hostmatcher
import (
"context"
"fmt"
"net"
"net/url"
"syscall"
"time"
)
// NewDialContext returns a DialContext for Transport, the DialContext will do allow/block list check
func NewDialContext(usage string, allowList, blockList *HostMatchList) func(ctx context.Context, network, addr string) (net.Conn, error) {
return NewDialContextWithProxy(usage, allowList, blockList, nil)
}
func NewDialContextWithProxy(usage string, allowList, blockList *HostMatchList, proxy *url.URL) func(ctx context.Context, network, addr string) (net.Conn, error) {
// How Go HTTP Client works with redirection:
// transport.RoundTrip URL=http://domain.com, Host=domain.com
// transport.DialContext addrOrHost=domain.com:80
// dialer.Control tcp4:11.22.33.44:80
// transport.RoundTrip URL=http://www.domain.com/, Host=(empty here, in the direction, HTTP client doesn't fill the Host field)
// transport.DialContext addrOrHost=domain.com:80
// dialer.Control tcp4:11.22.33.44:80
return func(ctx context.Context, network, addrOrHost string) (net.Conn, error) {
dialer := net.Dialer{
// default values comes from http.DefaultTransport
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
Control: func(network, ipAddr string, c syscall.RawConn) error {
host, port, err := net.SplitHostPort(addrOrHost)
if err != nil {
return err
}
if proxy != nil {
// Always allow the host of the proxy, but only on the specified port.
if host == proxy.Hostname() && port == proxy.Port() {
return nil
}
}
// in Control func, the addr was already resolved to IP:PORT format, there is no cost to do ResolveTCPAddr here
tcpAddr, err := net.ResolveTCPAddr(network, ipAddr)
if err != nil {
return fmt.Errorf("%s can only call HTTP servers via TCP, deny '%s(%s:%s)', err=%w", usage, host, network, ipAddr, err)
}
var blockedError error
if blockList.MatchHostOrIP(host, tcpAddr.IP) {
blockedError = fmt.Errorf("%s can not call blocked HTTP servers (check your %s setting), deny '%s(%s)'", usage, blockList.SettingKeyHint, host, ipAddr)
}
// if we have an allow-list, check the allow-list first
if !allowList.IsEmpty() {
if !allowList.MatchHostOrIP(host, tcpAddr.IP) {
return fmt.Errorf("%s can only call allowed HTTP servers (check your %s setting), deny '%s(%s)'", usage, allowList.SettingKeyHint, host, ipAddr)
}
}
// otherwise, we always follow the blocked list
return blockedError
},
}
return dialer.DialContext(ctx, network, addrOrHost)
}
}