Cherry-pick #22996 to 7.x: [Packetbeat] Update ingress/egress traffic…

… directionality (#23048)

* [Packetbeat] Update ingress/egress traffic directionality (#22996)

* [Packetbeat] Update ingress/egress traffic directionality

* Fix yml indentation

* Fix up changelog

* rename to internal_networks and use network conditions

* Fix up broken link

* Stupid bad merges

* Re-add eroneously deleted entry

(cherry picked from commit cc2dd9f)

* Fix changelog

CHANGELOG.next.asciidoc

@@ -83,6 +83,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 
 - Added redact_headers configuration option, to allow HTTP request headers to be redacted whilst keeping the header field included in the beat. {pull}15353[15353]
 - Add dns.question.subdomain and dns.question.top_level_domain fields. {pull}14578[14578]
+- Update how Packetbeat classifies network directionality to bring it in line with ECS 1.7 {pull}22996[22996]
 
 *Winlogbeat*
 

packetbeat/_meta/config/beat.reference.yml.tmpl

@@ -13,6 +13,16 @@
 # keyword to sniff on all connected interfaces.
 packetbeat.interfaces.device: {{ call .device .GOOS }}
 
+# The network CIDR blocks that are considered "internal" networks for
+# the purpose of network perimeter boundary classification. The valid
+# values for internal_networks are the same as those that can be used
+# with processor network conditions.
+#
+# For a list of available values see:
+# https://www.elastic.co/guide/en/beats/packetbeat/current/defining-processors.html#condition-network
+packetbeat.interfaces.internal_networks:
+  - private
+
 # Packetbeat supports three sniffer types:
 # * pcap, which uses the libpcap library and works on most platforms, but it's
 # not the fastest option.

packetbeat/_meta/config/beat.yml.tmpl

@@ -13,6 +13,16 @@
 # "any" keyword to sniff on all connected interfaces.
 packetbeat.interfaces.device: {{ call .device .GOOS }}
 
+# The network CIDR blocks that are considered "internal" networks for
+# the purpose of network perimeter boundary classification. The valid
+# values for internal_networks are the same as those that can be used
+# with processor network conditions.
+#
+# For a list of available values see:
+# https://www.elastic.co/guide/en/beats/packetbeat/current/defining-processors.html#condition-network
+packetbeat.interfaces.internal_networks:
+  - private
+
 {{header "Flows"}}
 
 # Set `enabled: false` or comment out all options to disable flows reporting.

packetbeat/beater/processor.go

@@ -118,6 +118,7 @@ func (p *processorFactory) Create(pipeline beat.PipelineConnector, cfg *common.C
 		p.beat.Publisher,
 		config.IgnoreOutgoing,
 		config.Interfaces.File == "",
+		config.Interfaces.InternalNetworks,
 	)
 	if err != nil {
 		return nil, err

packetbeat/config/config.go

@@ -75,14 +75,15 @@ func (c Config) ICMP() (*common.Config, error) {
 }
 
 type InterfacesConfig struct {
-	Device                string `config:"device"`
-	Type                  string `config:"type"`
-	File                  string `config:"file"`
-	WithVlans             bool   `config:"with_vlans"`
-	BpfFilter             string `config:"bpf_filter"`
-	Snaplen               int    `config:"snaplen"`
-	BufferSizeMb          int    `config:"buffer_size_mb"`
-	EnableAutoPromiscMode bool   `config:"auto_promisc_mode"`
+	Device                string   `config:"device"`
+	Type                  string   `config:"type"`
+	File                  string   `config:"file"`
+	WithVlans             bool     `config:"with_vlans"`
+	BpfFilter             string   `config:"bpf_filter"`
+	Snaplen               int      `config:"snaplen"`
+	BufferSizeMb          int      `config:"buffer_size_mb"`
+	EnableAutoPromiscMode bool     `config:"auto_promisc_mode"`
+	InternalNetworks      []string `config:"internal_networks"`
 	TopSpeed              bool
 	Dumpfile              string
 	OneAtATime            bool

packetbeat/docs/packetbeat-options.asciidoc

@@ -270,6 +270,16 @@ see the following published transactions (when `ignore_outgoing` is true):
  - Beat2: t1
  - Beat3: t2
 
+ [float]
+==== `internal_networks`
+
+If the `internal_networks` option is specified, when monitoring network taps or mirror ports, Packetbeat
+will attempt to classify the network directionality of traffic not intended for this host as it
+relates to a network perimeter. Any CIDR block specified in `internal_networks` is treated internal to
+the perimeter, and any IP address falling outside of these CIDR blocks is considered external.
+
+This is useful when Packetbeat is running on an appliance that sits at a network boundary such as
+a firewall or VPN. Note that this only affects how the directionality of network traffic is classified.
 
 [[configuration-flows]]
 == Configure flows to monitor network traffic

packetbeat/packetbeat.reference.yml

@@ -13,6 +13,16 @@
 # keyword to sniff on all connected interfaces.
 packetbeat.interfaces.device: any
 
+# The network CIDR blocks that are considered "internal" networks for
+# the purpose of network perimeter boundary classification. The valid
+# values for internal_networks are the same as those that can be used
+# with processor network conditions.
+#
+# For a list of available values see:
+# https://www.elastic.co/guide/en/beats/packetbeat/current/defining-processors.html#condition-network
+packetbeat.interfaces.internal_networks:
+  - private
+
 # Packetbeat supports three sniffer types:
 # * pcap, which uses the libpcap library and works on most platforms, but it's
 # not the fastest option.

packetbeat/packetbeat.yml

@@ -13,6 +13,16 @@
 # "any" keyword to sniff on all connected interfaces.
 packetbeat.interfaces.device: any
 
+# The network CIDR blocks that are considered "internal" networks for
+# the purpose of network perimeter boundary classification. The valid
+# values for internal_networks are the same as those that can be used
+# with processor network conditions.
+#
+# For a list of available values see:
+# https://www.elastic.co/guide/en/beats/packetbeat/current/defining-processors.html#condition-network
+packetbeat.interfaces.internal_networks:
+  - private
+
 # =================================== Flows ====================================
 
 # Set `enabled: false` or comment out all options to disable flows reporting.

packetbeat/pb/event.go

@@ -29,6 +29,7 @@ import (
 	"github.com/elastic/beats/v7/libbeat/beat"
 	"github.com/elastic/beats/v7/libbeat/common"
 	"github.com/elastic/beats/v7/libbeat/common/flowhash"
+	"github.com/elastic/beats/v7/libbeat/conditions"
 	"github.com/elastic/ecs/code/go/ecs"
 )
 
@@ -42,6 +43,10 @@ const (
 	Inbound  = "inbound"
 	Outbound = "outbound"
 	Internal = "internal"
+	External = "external"
+	Egress   = "egress"
+	Ingress  = "ingress"
+	Unknown  = "unknown"
 )
 
 // Fields contains common fields used in Packetbeat events. Protocol
@@ -216,7 +221,7 @@ func makeProcess(p *common.Process) *ecs.Process {
 }
 
 // ComputeValues computes derived values like network.bytes and writes them to f.
-func (f *Fields) ComputeValues(localIPs []net.IP) error {
+func (f *Fields) ComputeValues(localIPs []net.IP, internalNetworks []string) error {
 	var flow flowhash.Flow
 
 	// network.bytes
@@ -266,27 +271,16 @@ func (f *Fields) ComputeValues(localIPs []net.IP) error {
 	}
 
 	// network.direction
-	if len(localIPs) > 0 && f.Network.Direction == "" {
-		if flow.SourceIP != nil {
-			for _, ip := range localIPs {
-				if flow.SourceIP.Equal(ip) {
-					f.Network.Direction = Outbound
-					break
-				}
-			}
-		}
-		if flow.DestinationIP != nil {
-			for _, ip := range localIPs {
-				if flow.DestinationIP.Equal(ip) {
-					if f.Network.Direction == Outbound {
-						f.Network.Direction = Internal
-					} else {
-						f.Network.Direction = Inbound
-					}
-					break
-				}
+	if f.Network.Direction == "" {
+		direction := hostBasedDirection(flow.SourceIP, flow.DestinationIP, localIPs)
+		if len(internalNetworks) > 0 && direction == Unknown {
+			var err error
+			direction, err = perimeterBasedDirection(flow.SourceIP, flow.DestinationIP, internalNetworks)
+			if err != nil {
+				return err
 			}
 		}
+		f.Network.Direction = direction
 	}
 
 	// process (dest process will take priority)
@@ -323,6 +317,51 @@ func (f *Fields) ComputeValues(localIPs []net.IP) error {
 	return nil
 }
 
+func hostBasedDirection(source, destination net.IP, ips []net.IP) string {
+	if destination != nil {
+		if destination.IsLoopback() || destination.IsLinkLocalUnicast() || destination.IsLinkLocalMulticast() {
+			return Ingress
+		}
+		for _, ip := range ips {
+			if destination.Equal(ip) {
+				return Ingress
+			}
+		}
+	}
+	if source != nil {
+		if source.IsLoopback() || source.IsLinkLocalUnicast() || source.IsLinkLocalMulticast() {
+			return Egress
+		}
+		for _, ip := range ips {
+			if source.Equal(ip) {
+				return Egress
+			}
+		}
+	}
+	return Unknown
+}
+
+func perimeterBasedDirection(source, destination net.IP, internalNetworks []string) (string, error) {
+	sourceInternal, err := conditions.NetworkContains(source, internalNetworks...)
+	if err != nil {
+		return Unknown, err
+	}
+	destinationInternal, err := conditions.NetworkContains(destination, internalNetworks...)
+	if err != nil {
+		return Unknown, err
+	}
+	if sourceInternal && destinationInternal {
+		return Internal, nil
+	}
+	if sourceInternal {
+		return Outbound, nil
+	}
+	if destinationInternal {
+		return Inbound, nil
+	}
+	return External, nil
+}
+
 // MarshalMapStr marshals the fields into MapStr. It returns an error if there
 // is a problem writing the keys to the given map (like if an intermediate key
 // exists and is not a map).

packetbeat/pb/event_test.go

@@ -57,7 +57,7 @@ func TestComputeValues(t *testing.T) {
 
 	localAddrs := []net.IP{net.ParseIP("127.0.0.1")}
 
-	if err := f.ComputeValues(localAddrs); err != nil {
+	if err := f.ComputeValues(localAddrs, nil); err != nil {
 		t.Fatal(err)
 	}
 
@@ -66,7 +66,7 @@ func TestComputeValues(t *testing.T) {
 	assert.EqualValues(t, f.Network.Bytes, 300)
 	assert.NotZero(t, f.Network.CommunityID)
 	assert.Equal(t, f.Network.Type, "ipv4")
-	assert.Equal(t, f.Network.Direction, "outbound")
+	assert.Equal(t, f.Network.Direction, "ingress")
 }
 
 func TestIsEmptyValue(t *testing.T) {

packetbeat/protos/amqp/amqp_test.go

@@ -38,7 +38,7 @@ type eventStore struct {
 }
 
 func (e *eventStore) publish(event beat.Event) {
-	publish.MarshalPacketbeatFields(&event, nil)
+	publish.MarshalPacketbeatFields(&event, nil, nil)
 	e.events = append(e.events, event)
 }
 

packetbeat/protos/dhcpv4/dhcpv4_test.go

@@ -126,6 +126,7 @@ func TestParseDHCPRequest(t *testing.T) {
 			},
 			"network": common.MapStr{
 				"type":         "ipv4",
+				"direction":    "unknown",
 				"transport":    "udp",
 				"protocol":     "dhcpv4",
 				"bytes":        272,
@@ -159,7 +160,7 @@ func TestParseDHCPRequest(t *testing.T) {
 
 	actual := p.parseDHCPv4(pkt)
 	if assert.NotNil(t, actual) {
-		publish.MarshalPacketbeatFields(actual, nil)
+		publish.MarshalPacketbeatFields(actual, nil, nil)
 		t.Logf("DHCP event: %+v", actual)
 		assertEqual(t, expected, *actual)
 	}
@@ -210,6 +211,7 @@ func TestParseDHCPACK(t *testing.T) {
 			},
 			"network": common.MapStr{
 				"type":         "ipv4",
+				"direction":    "unknown",
 				"transport":    "udp",
 				"protocol":     "dhcpv4",
 				"bytes":        300,
@@ -241,7 +243,7 @@ func TestParseDHCPACK(t *testing.T) {
 
 	actual := p.parseDHCPv4(pkt)
 	if assert.NotNil(t, actual) {
-		publish.MarshalPacketbeatFields(actual, nil)
+		publish.MarshalPacketbeatFields(actual, nil, nil)
 		t.Logf("DHCP event: %+v", actual)
 		assertEqual(t, expected, *actual)
 	}

packetbeat/protos/dns/dns_test.go

@@ -82,7 +82,7 @@ type eventStore struct {
 }
 
 func (e *eventStore) publish(event beat.Event) {
-	publish.MarshalPacketbeatFields(&event, nil)
+	publish.MarshalPacketbeatFields(&event, nil, nil)
 	e.events = append(e.events, event)
 }
 

packetbeat/protos/http/http_test.go

@@ -51,7 +51,7 @@ type eventStore struct {
 }
 
 func (e *eventStore) publish(event beat.Event) {
-	publish.MarshalPacketbeatFields(&event, nil)
+	publish.MarshalPacketbeatFields(&event, nil, nil)
 	e.events = append(e.events, event)
 }
 

packetbeat/protos/mysql/mysql_test.go

@@ -44,7 +44,7 @@ type eventStore struct {
 }
 
 func (e *eventStore) publish(event beat.Event) {
-	publish.MarshalPacketbeatFields(&event, nil)
+	publish.MarshalPacketbeatFields(&event, nil, nil)
 	e.events = append(e.events, event)
 }
 

packetbeat/protos/pgsql/pgsql_test.go

@@ -41,7 +41,7 @@ type eventStore struct {
 }
 
 func (e *eventStore) publish(event beat.Event) {
-	publish.MarshalPacketbeatFields(&event, nil)
+	publish.MarshalPacketbeatFields(&event, nil, nil)
 	e.events = append(e.events, event)
 }
 

packetbeat/protos/tls/tls_test.go

@@ -40,7 +40,7 @@ type eventStore struct {
 }
 
 const (
-	expectedClientHello = `{"client":{"ip":"192.168.0.1","port":6512},"destination":{"domain":"example.org","ip":"192.168.0.2","port":27017},"event":{"category":["network_traffic","network"],"dataset":"tls","kind":"event","type":["connection","protocol"]},"network":{"community_id":"1:jKfewJN/czjTuEpVvsKdYXXiMzs=","protocol":"tls","transport":"tcp","type":"ipv4"},"related":{"ip":["192.168.0.1","192.168.0.2"]},"server":{"domain":"example.org","ip":"192.168.0.2","port":27017},"source":{"ip":"192.168.0.1","port":6512},"status":"Error","tls":{"client":{"ja3":"94c485bca29d5392be53f2b8cf7f4304","server_name":"example.org","supported_ciphers":["TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256","TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256","TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256","TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256","TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA","TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA","TLS_RSA_WITH_AES_128_GCM_SHA256","TLS_RSA_WITH_AES_256_GCM_SHA384","TLS_RSA_WITH_AES_128_CBC_SHA","TLS_RSA_WITH_AES_256_CBC_SHA","TLS_RSA_WITH_3DES_EDE_CBC_SHA"]},"detailed":{"client_certificate_requested":false,"client_hello":{"extensions":{"_unparsed_":["renegotiation_info","23","status_request","18","30032"],"application_layer_protocol_negotiation":["h2","http/1.1"],"ec_points_formats":["uncompressed"],"server_name_indication":["example.org"],"session_ticket":"","signature_algorithms":["ecdsa_secp256r1_sha256","rsa_pss_sha256","rsa_pkcs1_sha256","ecdsa_secp384r1_sha384","rsa_pss_sha384","rsa_pkcs1_sha384","rsa_pss_sha512","rsa_pkcs1_sha512","rsa_pkcs1_sha1"],"supported_groups":["x25519","secp256r1","secp384r1"]},"supported_compression_methods":["NULL"],"version":"3.3"},"version":"TLS 1.2"},"established":false,"resumed":false,"version":"1.2","version_protocol":"tls"},"type":"tls"}`
+	expectedClientHello = `{"client":{"ip":"192.168.0.1","port":6512},"destination":{"domain":"example.org","ip":"192.168.0.2","port":27017},"event":{"category":["network_traffic","network"],"dataset":"tls","kind":"event","type":["connection","protocol"]},"network":{"community_id":"1:jKfewJN/czjTuEpVvsKdYXXiMzs=","direction":"unknown","protocol":"tls","transport":"tcp","type":"ipv4"},"related":{"ip":["192.168.0.1","192.168.0.2"]},"server":{"domain":"example.org","ip":"192.168.0.2","port":27017},"source":{"ip":"192.168.0.1","port":6512},"status":"Error","tls":{"client":{"ja3":"94c485bca29d5392be53f2b8cf7f4304","server_name":"example.org","supported_ciphers":["TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256","TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256","TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256","TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256","TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA","TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA","TLS_RSA_WITH_AES_128_GCM_SHA256","TLS_RSA_WITH_AES_256_GCM_SHA384","TLS_RSA_WITH_AES_128_CBC_SHA","TLS_RSA_WITH_AES_256_CBC_SHA","TLS_RSA_WITH_3DES_EDE_CBC_SHA"]},"detailed":{"client_certificate_requested":false,"client_hello":{"extensions":{"_unparsed_":["renegotiation_info","23","status_request","18","30032"],"application_layer_protocol_negotiation":["h2","http/1.1"],"ec_points_formats":["uncompressed"],"server_name_indication":["example.org"],"session_ticket":"","signature_algorithms":["ecdsa_secp256r1_sha256","rsa_pss_sha256","rsa_pkcs1_sha256","ecdsa_secp384r1_sha384","rsa_pss_sha384","rsa_pkcs1_sha384","rsa_pss_sha512","rsa_pkcs1_sha512","rsa_pkcs1_sha1"],"supported_groups":["x25519","secp256r1","secp384r1"]},"supported_compression_methods":["NULL"],"version":"3.3"},"version":"TLS 1.2"},"established":false,"resumed":false,"version":"1.2","version_protocol":"tls"},"type":"tls"}`
 	expectedServerHello = `{"extensions":{"_unparsed_":["renegotiation_info","status_request"],"application_layer_protocol_negotiation":["h2"],"ec_points_formats":["uncompressed","ansiX962_compressed_prime","ansiX962_compressed_char2"],"session_ticket":""},"selected_compression_method":"NULL","version":"3.3"}`
 	rawClientHello      = "16030100c2010000be03033367dfae0d46ec0651e49cca2ae47317e8989df710" +
 		"ee7570a88b9a7d5d56b3af00001c3a3ac02bc02fc02cc030cca9cca8c013c014" +
@@ -57,7 +57,7 @@ const (
 )
 
 func (e *eventStore) publish(event beat.Event) {
-	publish.MarshalPacketbeatFields(&event, nil)
+	publish.MarshalPacketbeatFields(&event, nil, nil)
 	e.events = append(e.events, event)
 }