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TLS communitcation between agents and analyzer
UDP and TLS can be used as communication socket DTLS in golang is not ready yet, but the most promising implementation : github.com/pixelbender/go-dtls/dtls will be compatible (API) with go crypto/tls implementation. Close skydive-project#121 Change-Id: I91b0d1e1374c336b0febe63f2b9ebc338f1712dc Signed-off-by: Nicolas PLANEL <nplanel@redhat.com>
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/* | ||
* Copyright (C) 2016 Red Hat, Inc. | ||
* | ||
* Licensed to the Apache Software Foundation (ASF) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. The ASF licenses this file | ||
* to you 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. | ||
* | ||
*/ | ||
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package analyzer | ||
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import ( | ||
"crypto/tls" | ||
// "crypto/x509" | ||
"errors" | ||
"fmt" | ||
// "io/ioutil" | ||
"net" | ||
"time" | ||
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"github.com/skydive-project/skydive/common" | ||
"github.com/skydive-project/skydive/config" | ||
"github.com/skydive-project/skydive/logging" | ||
) | ||
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var ErrAgentAnalyzerFakeUDPTimeout = errors.New("UDP connection fake timeout") | ||
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type AgentAnalyzerConnectionType int | ||
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const ( | ||
UDP AgentAnalyzerConnectionType = 1 + iota | ||
TLS | ||
) | ||
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type AgentAnalyzerServerConn struct { | ||
mode AgentAnalyzerConnectionType | ||
udpConn *net.UDPConn | ||
tlsConn net.Conn | ||
tlsListen net.Listener | ||
} | ||
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func (a *AgentAnalyzerServerConn) Accept() (*AgentAnalyzerServerConn, error) { | ||
var err error | ||
if a.mode == TLS { | ||
a.tlsConn, err = a.tlsListen.Accept() | ||
if err != nil { | ||
return nil, err | ||
} | ||
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if tlsConn, ok := a.tlsConn.(*tls.Conn); ok { | ||
err = tlsConn.Handshake() | ||
if err != nil { | ||
logging.GetLogger().Errorf("handshake error %v", err) | ||
return nil, err | ||
} | ||
state := tlsConn.ConnectionState() | ||
if state.HandshakeComplete == false { | ||
logging.GetLogger().Warning("TLS Handshake is not complete") | ||
} | ||
} | ||
return &AgentAnalyzerServerConn{ | ||
mode: TLS, | ||
tlsConn: a.tlsConn, | ||
}, nil | ||
} | ||
if a.mode == UDP { | ||
return a, ErrAgentAnalyzerFakeUDPTimeout | ||
} | ||
return nil, errors.New("Connection mode is not set properly") | ||
} | ||
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func (a *AgentAnalyzerServerConn) Close() { | ||
switch a.mode { | ||
case TLS: | ||
logging.GetLogger().Critical("tls server close") | ||
err := a.tlsConn.Close() | ||
if err != nil { | ||
logging.GetLogger().Errorf("Close error %v", err) | ||
} | ||
case UDP: | ||
err := a.udpConn.Close() | ||
if err != nil { | ||
logging.GetLogger().Errorf("Close error %v", err) | ||
} | ||
} | ||
} | ||
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func (a *AgentAnalyzerServerConn) SetDeadline(t time.Time) { | ||
switch a.mode { | ||
case TLS: | ||
err := a.tlsConn.SetReadDeadline(t) | ||
if err != nil { | ||
logging.GetLogger().Errorf("SetReadDeadline %v", err) | ||
} | ||
case UDP: | ||
err := a.udpConn.SetDeadline(t) | ||
if err != nil { | ||
logging.GetLogger().Errorf("SetDeadline %v", err) | ||
} | ||
} | ||
} | ||
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func (a *AgentAnalyzerServerConn) Read(data []byte) (int, error) { | ||
switch a.mode { | ||
case TLS: | ||
n, err := a.tlsConn.Read(data) | ||
return n, err | ||
case UDP: | ||
n, _, err := a.udpConn.ReadFromUDP(data) | ||
return n, err | ||
} | ||
return 0, errors.New("Mode didn't exist") | ||
} | ||
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func NewAgentAnalyzerServerConn(addr *net.UDPAddr) (a *AgentAnalyzerServerConn, err error) { | ||
a = &AgentAnalyzerServerConn{mode: UDP} | ||
certpem := config.GetConfig().GetString("analyzer.X509_cert") | ||
keypem := config.GetConfig().GetString("analyzer.X509_key") | ||
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if len(certpem) > 0 && len(keypem) > 0 { | ||
cert, err := tls.LoadX509KeyPair(certpem, keypem) | ||
if err != nil { | ||
logging.GetLogger().Fatalf("Can't read X509 key pair set in config : cert '%s' key '%s'", certpem, keypem) | ||
return nil, err | ||
} | ||
cfgTLS := &tls.Config{ | ||
ClientAuth: tls.RequireAndVerifyClientCert, | ||
Certificates: []tls.Certificate{cert}, | ||
} | ||
a.tlsListen, err = tls.Listen("tcp", fmt.Sprintf("%s:%d", common.IPToString(addr.IP), addr.Port+1), cfgTLS) | ||
if err != nil { | ||
return nil, err | ||
} | ||
a.mode = TLS | ||
logging.GetLogger().Info("Analyzer listen agents on TLS socket") | ||
return a, nil | ||
} | ||
a.udpConn, err = net.ListenUDP("udp", addr) | ||
logging.GetLogger().Info("Analyzer listen agents on UDP socket") | ||
return a, err | ||
} | ||
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type AgentAnalyzerClientConn struct { | ||
udpConn *net.UDPConn | ||
tlsConnClient *tls.Conn | ||
} | ||
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func (a *AgentAnalyzerClientConn) Close() { | ||
if a.tlsConnClient != nil { | ||
logging.GetLogger().Critical("tls close") | ||
a.tlsConnClient.Close() | ||
return | ||
} | ||
a.udpConn.Close() | ||
} | ||
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func (a *AgentAnalyzerClientConn) Write(b []byte) (int, error) { | ||
if a.tlsConnClient != nil { | ||
logging.GetLogger().Criticalf("tls write %d", len(b)) | ||
return a.tlsConnClient.Write(b) | ||
} | ||
return a.udpConn.Write(b) | ||
} | ||
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func NewAgentAnalyzerClientConn(addr *net.UDPAddr) (a *AgentAnalyzerClientConn, err error) { | ||
a = &AgentAnalyzerClientConn{} | ||
certpem := config.GetConfig().GetString("agent.X509_cert") | ||
if len(certpem) > 0 { | ||
time.Sleep(time.Second) | ||
logging.GetLogger().Critical("TLS client connection ... Dial" + fmt.Sprintf("%s:%d", common.IPToString(addr.IP), addr.Port+1)) | ||
/* | ||
rootPEM, err := ioutil.ReadFile(certpem) | ||
if err != nil { | ||
logging.GetLogger().Fatalf("Failed to open root certificate '%s' : %s", certpem, err.Error()) | ||
} | ||
roots := x509.NewCertPool() | ||
ok := roots.AppendCertsFromPEM([]byte(rootPEM)) | ||
if !ok { | ||
logging.GetLogger().Fatal("Failed to parse root certificate " + certpem) | ||
} | ||
cfgTLS := &tls.Config{RootCAs: roots} | ||
*/ | ||
cfgTLS := &tls.Config{InsecureSkipVerify: true} | ||
a.tlsConnClient, err = tls.Dial("tcp", fmt.Sprintf("%s:%d", common.IPToString(addr.IP), addr.Port+1), cfgTLS) | ||
if err != nil { | ||
logging.GetLogger().Errorf("TLS error %s %v %v %s", fmt.Sprintf("%s:%d", common.IPToString(addr.IP), addr.Port+1), cfgTLS, err, err.Error()) | ||
return nil, err | ||
} | ||
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logging.GetLogger().Critical("TLS cnx state ... ") | ||
state := a.tlsConnClient.ConnectionState() | ||
if state.HandshakeComplete == false { | ||
logging.GetLogger().Warning("TLS Handshake is not complete") | ||
} | ||
logging.GetLogger().Debug("TLS Handshake is complete") | ||
logging.GetLogger().Critical("TLS client connection complete") | ||
return a, nil | ||
} | ||
a.udpConn, err = net.DialUDP("udp", nil, addr) | ||
if err != nil { | ||
return nil, err | ||
} | ||
logging.GetLogger().Critical("UDP client connection complete") | ||
return a, nil | ||
} |
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