Merge pull request danielqsj#101 from squ1d123/scram

Scram

README.md

@@ -98,6 +98,7 @@ This image is configurable using different flags
 | sasl.handshake               | true       | Only set this to false if using a non-Kafka SASL proxy                                              |
 | sasl.username                |            | SASL user name                                                                                      |
 | sasl.password                |            | SASL user password                                                                                  |
+| sasl.mechanism               |            | SASL mechanism can be plain, scram-sha512, scram-sha256
 | tls.enabled                  | false      | Connect using TLS                                                                                   |
 | tls.ca-file                  |            | The optional certificate authority file for TLS client authentication                               |
 | tls.cert-file                |            | The optional certificate file for client authentication                                             |

go.mod

@@ -0,0 +1,31 @@
+module github.com/danielqsj/kafka_exporter
+
+go 1.12
+
+require (
+	github.com/Shopify/sarama v1.22.1
+	github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc
+	github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf
+	github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973
+	github.com/davecgh/go-spew v1.1.1
+	github.com/eapache/go-resiliency v1.1.0
+	github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21
+	github.com/eapache/queue v1.1.0
+	github.com/golang/protobuf v1.2.0
+	github.com/golang/snappy v0.0.1
+	github.com/konsorten/go-windows-terminal-sequences v1.0.1
+	github.com/krallistic/kazoo-go v0.0.0-20170526135507-a15279744f4e
+	github.com/matttproud/golang_protobuf_extensions v1.0.1
+	github.com/pierrec/lz4 v0.0.0-20190327172049-315a67e90e41
+	github.com/prometheus/client_golang v0.8.0
+	github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910
+	github.com/prometheus/common v0.0.0-20181116084131-1f2c4f3cd6db
+	github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d
+	github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a
+	github.com/samuel/go-zookeeper v0.0.0-20180130194729-c4fab1ac1bec
+	github.com/sirupsen/logrus v1.2.0
+	github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c
+	golang.org/x/crypto v0.0.0-20190404164418-38d8ce5564a5
+	golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e
+	gopkg.in/alecthomas/kingpin.v2 v2.2.6
+)

go.sum

@@ -0,0 +1,85 @@
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kafka_exporter.go

@@ -66,6 +66,7 @@ type kafkaOpts struct {
 	useSASLHandshake         bool
 	saslUsername             string
 	saslPassword             string
+	saslMechanism            string
 	useTLS                   bool
 	tlsCAFile                string
 	tlsCertFile              string
@@ -124,6 +125,21 @@ func NewExporter(opts kafkaOpts, topicFilter string, groupFilter string) (*Expor
 	config.Version = kafkaVersion
 
 	if opts.useSASL {
+		// Convert to lowercase so that SHA512 and SHA256 is still valid
+		opts.saslMechanism = strings.ToLower(opts.saslMechanism)
+		switch opts.saslMechanism {
+		case "scram-sha512":
+			config.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: SHA512} }
+			config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA512)
+		case "scram-sha256":
+			config.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: SHA256} }
+			config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA256)
+
+		case "plain":
+		default:
+			plog.Fatalf("invalid sasl mechanism \"%s\": can only be \"scram-sha256\", \"scram-sha512\" or \"plain\"", opts.saslMechanism)
+		}
+
 		config.Net.SASL.Enable = true
 		config.Net.SASL.Handshake = opts.useSASLHandshake
 
@@ -481,6 +497,7 @@ func main() {
 	kingpin.Flag("sasl.handshake", "Only set this to false if using a non-Kafka SASL proxy.").Default("true").BoolVar(&opts.useSASLHandshake)
 	kingpin.Flag("sasl.username", "SASL user name.").Default("").StringVar(&opts.saslUsername)
 	kingpin.Flag("sasl.password", "SASL user password.").Default("").StringVar(&opts.saslPassword)
+	kingpin.Flag("sasl.mechanism", "The SASL SCRAM SHA algorithm sha256 or sha512 as mechanism").Default("").StringVar(&opts.saslMechanism)
 	kingpin.Flag("tls.enabled", "Connect using TLS.").Default("false").BoolVar(&opts.useTLS)
 	kingpin.Flag("tls.ca-file", "The optional certificate authority file for TLS client authentication.").Default("").StringVar(&opts.tlsCAFile)
 	kingpin.Flag("tls.cert-file", "The optional certificate file for client authentication.").Default("").StringVar(&opts.tlsCertFile)

scram_client.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"crypto/sha256"
+	"crypto/sha512"
+	"hash"
+
+	"github.com/xdg/scram"
+)
+
+var SHA256 scram.HashGeneratorFcn = func() hash.Hash { return sha256.New() }
+var SHA512 scram.HashGeneratorFcn = func() hash.Hash { return sha512.New() }
+
+type XDGSCRAMClient struct {
+	*scram.Client
+	*scram.ClientConversation
+	scram.HashGeneratorFcn
+}
+
+func (x *XDGSCRAMClient) Begin(userName, password, authzID string) (err error) {
+	x.Client, err = x.HashGeneratorFcn.NewClient(userName, password, authzID)
+	if err != nil {
+		return err
+	}
+	x.ClientConversation = x.Client.NewConversation()
+	return nil
+}
+
+func (x *XDGSCRAMClient) Step(challenge string) (response string, err error) {
+	response, err = x.ClientConversation.Step(challenge)
+	return
+}
+
+func (x *XDGSCRAMClient) Done() bool {
+	return x.ClientConversation.Done()
+}