From a27b07458898482709820b778301d80892839c1e Mon Sep 17 00:00:00 2001
From: Dheeraj Dwivedi <dhruv.x@gmail.com>
Date: Wed, 14 Jun 2017 02:12:11 +0530
Subject: [PATCH] Add secure connection support to graphite output (#2602)

---
 etc/telegraf.conf                    |  7 +++++
 plugins/outputs/graphite/README.md   | 25 +++++++++++++++++
 plugins/outputs/graphite/graphite.go | 42 +++++++++++++++++++++++++++-
 3 files changed, 73 insertions(+), 1 deletion(-)

diff --git a/etc/telegraf.conf b/etc/telegraf.conf
index 5c105a30a..8aa9427c4 100644
--- a/etc/telegraf.conf
+++ b/etc/telegraf.conf
@@ -270,6 +270,13 @@
 #   template = "host.tags.measurement.field"
 #   ## timeout in seconds for the write connection to graphite
 #   timeout = 2
+#
+#   ## Optional SSL Config
+#   ssl_ca = "/etc/telegraf/ca.pem"
+#   ssl_cert = "/etc/telegraf/cert.pem"
+#   ssl_key = "/etc/telegraf/key.pem"
+#   ## Use SSL but skip chain & host verification
+#   insecure_skip_verify = false
 
 
 # # Send telegraf metrics to graylog(s)
diff --git a/plugins/outputs/graphite/README.md b/plugins/outputs/graphite/README.md
index 3e2369e21..1b173962f 100644
--- a/plugins/outputs/graphite/README.md
+++ b/plugins/outputs/graphite/README.md
@@ -19,6 +19,13 @@ via raw TCP.
   template = "host.tags.measurement.field"
   ## timeout in seconds for the write connection to graphite
   timeout = 2
+
+  ## Optional SSL Config
+  # ssl_ca = "/etc/telegraf/ca.pem"
+  # ssl_cert = "/etc/telegraf/cert.pem"
+  # ssl_key = "/etc/telegraf/key.pem"
+  ## Use SSL but skip chain & host verification
+  # insecure_skip_verify = false
 ```
 
 Parameters:
@@ -28,9 +35,27 @@ Parameters:
     Timeout  int
     Template string
 
+    // Path to CA file
+    SSLCA string
+    // Path to host cert file
+    SSLCert string
+    // Path to cert key file
+    SSLKey string
+    // Skip SSL verification
+    InsecureSkipVerify bool
+
+### Required parameters:
+
 * `servers`: List of strings, ["mygraphiteserver:2003"].
 * `prefix`: String use to prefix all sent metrics.
 * `timeout`: Connection timeout in seconds.
 * `template`: Template for graphite output format, see
 https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
 for more details.
+
+### Optional parameters:
+
+* `ssl_ca`: SSL CA
+* `ssl_cert`: SSL CERT
+* `ssl_key`: SSL key
+* `insecure_skip_verify`: Use SSL but skip chain & host verification (default: false)
diff --git a/plugins/outputs/graphite/graphite.go b/plugins/outputs/graphite/graphite.go
index 8d4447cdd..180217214 100644
--- a/plugins/outputs/graphite/graphite.go
+++ b/plugins/outputs/graphite/graphite.go
@@ -1,6 +1,7 @@
 package graphite
 
 import (
+	"crypto/tls"
 	"errors"
 	"io"
 	"log"
@@ -9,6 +10,7 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal"
 	"github.com/influxdata/telegraf/plugins/outputs"
 	"github.com/influxdata/telegraf/plugins/serializers"
 )
@@ -20,6 +22,18 @@ type Graphite struct {
 	Template string
 	Timeout  int
 	conns    []net.Conn
+
+	// Path to CA file
+	SSLCA string `toml:"ssl_ca"`
+	// Path to host cert file
+	SSLCert string `toml:"ssl_cert"`
+	// Path to cert key file
+	SSLKey string `toml:"ssl_key"`
+	// Skip SSL verification
+	InsecureSkipVerify bool
+
+	// tls config
+	tlsConfig *tls.Config
 }
 
 var sampleConfig = `
@@ -34,6 +48,13 @@ var sampleConfig = `
   template = "host.tags.measurement.field"
   ## timeout in seconds for the write connection to graphite
   timeout = 2
+
+  ## Optional SSL Config
+  # ssl_ca = "/etc/telegraf/ca.pem"
+  # ssl_cert = "/etc/telegraf/cert.pem"
+  # ssl_key = "/etc/telegraf/key.pem"
+  ## Use SSL but skip chain & host verification
+  # insecure_skip_verify = false
 `
 
 func (g *Graphite) Connect() error {
@@ -44,10 +65,29 @@ func (g *Graphite) Connect() error {
 	if len(g.Servers) == 0 {
 		g.Servers = append(g.Servers, "localhost:2003")
 	}
+
+	// Set tls config
+	var err error
+	g.tlsConfig, err = internal.GetTLSConfig(
+		g.SSLCert, g.SSLKey, g.SSLCA, g.InsecureSkipVerify)
+	if err != nil {
+		return err
+	}
+
 	// Get Connections
 	var conns []net.Conn
 	for _, server := range g.Servers {
-		conn, err := net.DialTimeout("tcp", server, time.Duration(g.Timeout)*time.Second)
+		// Dialer with timeout
+		d := net.Dialer{Timeout: time.Duration(g.Timeout) * time.Second}
+
+		// Get secure connection if tls config is set
+		var conn net.Conn
+		if g.tlsConfig != nil {
+			conn, err = tls.DialWithDialer(&d, "tcp", server, g.tlsConfig)
+		} else {
+			conn, err = d.Dial("tcp", server)
+		}
+
 		if err == nil {
 			conns = append(conns, conn)
 		}