mirror of
https://github.com/gravitational/teleport.git
synced 2026-11-02 14:59:53 +08:00
Gavin Frazar
1858aafa15
* Fix http proxy basic auth * Update docs about HTTP CONNECT env var formats
103 lines
2.9 KiB
Go
103 lines
2.9 KiB
Go
/*
|
|
Copyright 2022 Gravitational, Inc.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package proxy
|
|
|
|
import (
|
|
"net/http"
|
|
"net/url"
|
|
"strings"
|
|
|
|
"github.com/gravitational/trace"
|
|
"golang.org/x/net/http/httpproxy"
|
|
)
|
|
|
|
// GetProxyURL gets the HTTP proxy address to use for a given address, if any.
|
|
func GetProxyURL(dialAddr string) *url.URL {
|
|
addrURL, err := parse(dialAddr)
|
|
if err != nil || addrURL == nil {
|
|
return nil
|
|
}
|
|
|
|
proxyFunc := httpproxy.FromEnvironment().ProxyFunc()
|
|
if addrURL.Scheme != "" {
|
|
proxyURL, err := proxyFunc(addrURL)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return proxyURL
|
|
}
|
|
|
|
for _, scheme := range []string{"https", "http"} {
|
|
addrURL.Scheme = scheme
|
|
proxyURL, err := proxyFunc(addrURL)
|
|
if err == nil && proxyURL != nil {
|
|
return proxyURL
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// parse parses an absolute URL. Unlike url.Parse, absolute URLs without a scheme are allowed.
|
|
func parse(addr string) (*url.URL, error) {
|
|
if addr == "" {
|
|
return nil, nil
|
|
}
|
|
addrURL, err := url.Parse(addr)
|
|
if err == nil && addrURL.Host != "" {
|
|
return addrURL, nil
|
|
}
|
|
|
|
// url.Parse won't correctly parse an absolute URL without a scheme, so try again with a scheme.
|
|
addrURL, err2 := url.Parse("http://" + addr)
|
|
if err2 != nil {
|
|
return nil, trace.NewAggregate(err, err2)
|
|
}
|
|
addrURL.Scheme = ""
|
|
return addrURL, nil
|
|
}
|
|
|
|
// HTTPFallbackRoundTripper is a wrapper for http.Transport that downgrades requests
|
|
// to plain HTTP when using a plain HTTP proxy at localhost.
|
|
type HTTPFallbackRoundTripper struct {
|
|
*http.Transport
|
|
isProxyHTTPLocalhost bool
|
|
}
|
|
|
|
// NewHTTPFallbackRoundTripper creates a new initialized HTTP fallback roundtripper.
|
|
func NewHTTPFallbackRoundTripper(transport *http.Transport, insecure bool) *HTTPFallbackRoundTripper {
|
|
proxyConfig := httpproxy.FromEnvironment()
|
|
rt := HTTPFallbackRoundTripper{
|
|
Transport: transport,
|
|
isProxyHTTPLocalhost: strings.HasPrefix(proxyConfig.HTTPProxy, "http://localhost"),
|
|
}
|
|
if rt.TLSClientConfig != nil {
|
|
rt.TLSClientConfig.InsecureSkipVerify = insecure
|
|
}
|
|
return &rt
|
|
}
|
|
|
|
// RoundTrip executes a single HTTP transaction. Part of the RoundTripper interface.
|
|
func (rt *HTTPFallbackRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
|
|
tlsConfig := rt.Transport.TLSClientConfig
|
|
// Use plain HTTP if proxying via http://localhost in insecure mode.
|
|
if rt.isProxyHTTPLocalhost && tlsConfig != nil && tlsConfig.InsecureSkipVerify {
|
|
req.URL.Scheme = "http"
|
|
}
|
|
return rt.Transport.RoundTrip(req)
|
|
}
|