107 lines
2.9 KiB
Go
107 lines
2.9 KiB
Go
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/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package proxy
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import (
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"crypto/tls"
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"fmt"
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"net"
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"net/http"
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"net/url"
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"github.com/golang/glog"
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utilnet "k8s.io/apimachinery/pkg/util/net"
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"k8s.io/apimachinery/third_party/forked/golang/netutil"
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)
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func DialURL(url *url.URL, transport http.RoundTripper) (net.Conn, error) {
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dialAddr := netutil.CanonicalAddr(url)
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dialer, _ := utilnet.Dialer(transport)
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switch url.Scheme {
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case "http":
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if dialer != nil {
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return dialer("tcp", dialAddr)
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}
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return net.Dial("tcp", dialAddr)
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case "https":
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// Get the tls config from the transport if we recognize it
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var tlsConfig *tls.Config
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var tlsConn *tls.Conn
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var err error
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tlsConfig, _ = utilnet.TLSClientConfig(transport)
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if dialer != nil {
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// We have a dialer; use it to open the connection, then
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// create a tls client using the connection.
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netConn, err := dialer("tcp", dialAddr)
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if err != nil {
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return nil, err
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}
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if tlsConfig == nil {
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// tls.Client requires non-nil config
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glog.Warningf("using custom dialer with no TLSClientConfig. Defaulting to InsecureSkipVerify")
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// tls.Handshake() requires ServerName or InsecureSkipVerify
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tlsConfig = &tls.Config{
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InsecureSkipVerify: true,
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}
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} else if len(tlsConfig.ServerName) == 0 && !tlsConfig.InsecureSkipVerify {
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// tls.Handshake() requires ServerName or InsecureSkipVerify
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// infer the ServerName from the hostname we're connecting to.
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inferredHost := dialAddr
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if host, _, err := net.SplitHostPort(dialAddr); err == nil {
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inferredHost = host
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}
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// Make a copy to avoid polluting the provided config
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tlsConfigCopy := utilnet.CloneTLSConfig(tlsConfig)
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tlsConfigCopy.ServerName = inferredHost
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tlsConfig = tlsConfigCopy
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}
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tlsConn = tls.Client(netConn, tlsConfig)
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if err := tlsConn.Handshake(); err != nil {
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netConn.Close()
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return nil, err
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}
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} else {
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// Dial
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tlsConn, err = tls.Dial("tcp", dialAddr, tlsConfig)
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if err != nil {
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return nil, err
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}
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}
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// Return if we were configured to skip validation
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if tlsConfig != nil && tlsConfig.InsecureSkipVerify {
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return tlsConn, nil
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}
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// Verify
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host, _, _ := net.SplitHostPort(dialAddr)
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if err := tlsConn.VerifyHostname(host); err != nil {
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tlsConn.Close()
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return nil, err
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}
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return tlsConn, nil
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default:
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return nil, fmt.Errorf("Unknown scheme: %s", url.Scheme)
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}
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}
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