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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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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,230 @@ | ||
| /* | ||
| * 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. | ||
| * | ||
| */ | ||
|
|
||
| package analyzer | ||
|
|
||
| import ( | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "errors" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "net" | ||
| "time" | ||
|
|
||
| "github.com/skydive-project/skydive/common" | ||
| "github.com/skydive-project/skydive/config" | ||
| "github.com/skydive-project/skydive/logging" | ||
| ) | ||
|
|
||
| var ErrAgentAnalyzerFakeUDPTimeout = errors.New("UDP connection fake timeout") | ||
|
|
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| type AgentAnalyzerConnectionType int | ||
|
|
||
| const ( | ||
| UDP AgentAnalyzerConnectionType = 1 + iota | ||
| TLS | ||
| ) | ||
|
|
||
| type AgentAnalyzerServerConn struct { | ||
| mode AgentAnalyzerConnectionType | ||
| udpConn *net.UDPConn | ||
| tlsConn net.Conn | ||
| tlsListen net.Listener | ||
| } | ||
|
|
||
| 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 | ||
| } | ||
|
|
||
| tlsConn, ok := a.tlsConn.(*tls.Conn) | ||
| if !ok { | ||
| logging.GetLogger().Fatalf("This is not a TLS connection %v", a.tlsConn) | ||
| } | ||
| err = tlsConn.Handshake() | ||
| if err != nil { | ||
| 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") | ||
| } | ||
|
|
||
| func (a *AgentAnalyzerServerConn) Close() { | ||
| switch a.mode { | ||
| case TLS: | ||
| 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) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| 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) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| 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") | ||
| } | ||
|
|
||
| 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") | ||
|
|
||
| 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 | ||
| } | ||
| 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, | ||
| 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 | ||
| } | ||
|
|
||
| type AgentAnalyzerClientConn struct { | ||
| udpConn *net.UDPConn | ||
| tlsConnClient *tls.Conn | ||
| } | ||
|
|
||
| func (a *AgentAnalyzerClientConn) Close() { | ||
| if a.tlsConnClient != nil { | ||
| a.tlsConnClient.Close() | ||
| return | ||
| } | ||
| a.udpConn.Close() | ||
| } | ||
|
|
||
| func (a *AgentAnalyzerClientConn) Write(b []byte) (int, error) { | ||
| if a.tlsConnClient != nil { | ||
| return a.tlsConnClient.Write(b) | ||
| } | ||
| return a.udpConn.Write(b) | ||
| } | ||
|
|
||
| func NewAgentAnalyzerClientConn(addr *net.UDPAddr) (a *AgentAnalyzerClientConn, err error) { | ||
| a = &AgentAnalyzerClientConn{} | ||
| certpem := config.GetConfig().GetString("agent.X509_cert") | ||
| keypem := config.GetConfig().GetString("agent.X509_key") | ||
|
|
||
| if len(certpem) > 0 && len(keypem) > 0 { | ||
| time.Sleep(time.Second) | ||
| 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 | ||
| } | ||
| 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{ | ||
| Certificates: []tls.Certificate{cert}, | ||
| RootCAs: roots, | ||
| } | ||
| logging.GetLogger().Debug("TLS client connection ... Dial " + fmt.Sprintf("%s:%d", common.IPToString(addr.IP), addr.Port+1)) | ||
| 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 | ||
| } | ||
| state := a.tlsConnClient.ConnectionState() | ||
| if state.HandshakeComplete == false { | ||
| logging.GetLogger().Warning("TLS Handshake is not complete") | ||
| } | ||
| logging.GetLogger().Debug("TLS Handshake is complete") | ||
| return a, nil | ||
| } | ||
| a.udpConn, err = net.DialUDP("udp", nil, addr) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| logging.GetLogger().Debug("UDP client dialup done") | ||
| return a, nil | ||
| } |
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