TLS support for TCP logger

cmd/config_logging.go

@@ -1,9 +1,12 @@
 package cmd
 
 import (
+	"crypto/tls"
+	"crypto/x509"
 	"github.com/mitchellh/mapstructure"
 	"github.com/pkg/errors"
 	"github.com/zrepl/zrepl/logger"
+	"io/ioutil"
 	"os"
 	"time"
 )
@@ -34,6 +37,11 @@ func parseLogging(i interface{}) (c *LoggingConfig, err error) {
 			Net           string
 			Address       string
 			RetryInterval string `mapstructure:"retry_interval"`
+			TLS           *struct {
+				CA   string
+				Cert string
+				Key  string
+			}
 		}
 		Syslog struct {
 			Enable        bool
@@ -91,6 +99,38 @@ func parseLogging(i interface{}) (c *LoggingConfig, err error) {
 
 		out.Net, out.Address = asMap.TCP.Net, asMap.TCP.Address
 
+		if asMap.TCP.TLS != nil {
+
+			cert, err := tls.LoadX509KeyPair(asMap.TCP.TLS.Cert, asMap.TCP.TLS.Key)
+			if err != nil {
+				return nil, errors.Wrap(err, "cannot load client cert")
+			}
+
+			var rootCAs *x509.CertPool
+			if asMap.TCP.TLS.CA == "" {
+				if rootCAs, err = x509.SystemCertPool(); err != nil {
+					return nil, errors.Wrap(err, "cannot open system cert pool")
+				}
+			} else {
+				rootCAs = x509.NewCertPool()
+				rootCAPEM, err := ioutil.ReadFile(asMap.TCP.TLS.CA)
+				if err != nil {
+					return nil, errors.Wrap(err, "cannot load CA cert")
+				}
+				if !rootCAs.AppendCertsFromPEM(rootCAPEM) {
+					return nil, errors.New("cannot parse CA cert")
+				}
+			}
+			if err != nil && asMap.TCP.TLS.CA == "" {
+				return nil, errors.Wrap(err, "cannot load root ca pool")
+			}
+
+			out.TLS = &tls.Config{
+				Certificates: []tls.Certificate{cert},
+				RootCAs:      rootCAs,
+			}
+		}
+
 		c.Outlets.Add(out, lvl)
 	}
 

cmd/config_test.go

@@ -22,10 +22,14 @@ func TestSampleConfigsAreParsedWithoutErrors(t *testing.T) {
 
 	for _, p := range paths {
 
-		_, err := ParseConfig(p)
+		c, err := ParseConfig(p)
 		if err != nil {
 			t.Errorf("error parsing %s:\n%+v", p, err)
 		}
+
+		t.Logf("file: %s", p)
+		t.Log(pretty.Sprint(c))
+
 	}
 
 }

cmd/logging_outlets.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"context"
+	"crypto/tls"
 	"github.com/pkg/errors"
 	"github.com/zrepl/zrepl/logger"
 	"io"
@@ -29,6 +30,7 @@ type TCPOutlet struct {
 	Formatter     EntryFormatter
 	Net, Address  string
 	Dialer        net.Dialer
+	TLS           *tls.Config
 	RetryInterval time.Duration
 	conn          net.Conn
 	retry         time.Time
@@ -46,8 +48,14 @@ func (h *TCPOutlet) WriteEntry(ctx context.Context, e logger.Entry) error {
 			return nil // this is not an error toward the logger
 			//return errors.New("TCP hook reconnect prohibited by retry interval")
 		}
-		h.conn, err = h.Dialer.DialContext(ctx, h.Net, h.Address)
+
+		if h.TLS != nil {
+			h.conn, err = tls.DialWithDialer(&h.Dialer, h.Net, h.Address, h.TLS)
+		} else {
+			h.conn, err = h.Dialer.DialContext(ctx, h.Net, h.Address)
+		}
 		if err != nil {
+			h.conn = nil
 			h.retry = time.Now()
 			return errors.Wrap(err, "cannot dial")
 		}
@@ -55,6 +63,7 @@ func (h *TCPOutlet) WriteEntry(ctx context.Context, e logger.Entry) error {
 
 	_, err = h.conn.Write(b)
 	if err != nil {
+		return errors.Wrap(err, "cannot write")
 		h.conn.Close()
 		h.conn = nil
 		return err

cmd/sampleconf/random/logging.yml

@@ -9,6 +9,10 @@ global:
       net: tcp
       address: 127.0.0.1:8080
       retry_interval: 1s
+      tls: # if not specified, use plain TCP
+        ca: sampleconf/random/logging/logserver.crt
+        cert: sampleconf/random/logging/client.crt
+        key: sampleconf/random/logging/client.key
     syslog:
       enable: true
       format: logfmt

cmd/sampleconf/random/logging/client.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDIzCCAgsCAQEwDQYJKoZIhvcNAQELBQAwWTELMAkGA1UEBhMCQVUxEzARBgNV
+BAgMClNvbWUtU3RhdGUxITAfBgNVBAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0
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+-----END CERTIFICATE-----

cmd/sampleconf/random/logging/client.csr

@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE REQUEST-----
+MIICmzCCAYMCAQAwVjELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUx
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+yhyjGfN0q0jHyHdpckBhgzS7IIdo6P66AIlm4qpHM7Scra3JaGM7oaZPamJ6f8U=
+-----END CERTIFICATE REQUEST-----

cmd/sampleconf/random/logging/client.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQC3/ElNSWoCl4kb
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+ifnel8XWUG0ROybsr1tk4mzW
+-----END PRIVATE KEY-----

cmd/sampleconf/random/logging/logserver.crt

@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDiDCCAnCgAwIBAgIJALhp/WvTQeg/MA0GCSqGSIb3DQEBCwUAMFkxCzAJBgNV
+BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX
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+-----END CERTIFICATE-----

cmd/sampleconf/random/logging/logserver.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCrN0y2H14Vd4Wq
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+5CbIivB0QCjeQIA8dOQpE8E=
+-----END PRIVATE KEY-----