Secure Networking for Kubernetes

SecureNetworking for Kubernetes

@mikegstoweMike Stowe

AboutMe

• API & Security Fanatic

• Open Source Contributor

• Speaker, Author, Consultant

• 10+ years Hacking Professional Code

• Community Guy at Tigera

https://www.mikestowe.com

AboutMe

• API & Security Fanatic

• Open Source Contributor

• Speaker, Author, Consultant

• 10+ years Hacking Professional Code

• Community Guy at Tigera

https://www.mikestowe.com

Felix

Let’s get started

Microservices are scalable…Yay!

Microservices are scalable…Yay!

Microservices increase network complexity!?

Containers are deployedfaster than typical VMs 900x

source: https://www.slideshare.net/Flux7Labs/performance-of-docker-vs-vms

60sec45sec 50ms50ms

DistributedContainer basedenvironments increaseworkloads for hosts by 10xsource: https://sysdig.com/blog/sysdig-docker-usage-report-2017/

While orchestratedcontainers haveashorter lifespan…bymore than

source: https://www.datadoghq.com/docker-adoption/

25x

Which creates a churnper host ofmore than 250x

Traditional SDNsdon’twork formicroservices architectures

InOtherWords

Microservices are secure…Yay!

Microservices are secure…Yay!

Microservices increase attack surface!?

SampleApproach toaMicroservices BasedArchitectures

Attack Surfaceof SampleArchitecture

Attack Surfaceof Real-WorldMicroservices BasedArchitectures

Each Service hasMultipleNetworkAttackPoints

Application (Layer 7)

Presentation(Layer 6)

Session (Layer 5)

Transport(Layer 4)

Network (Layer 3)

Data Link (Layer 2)

Physical (Layer 1)

HTTP, FTP, Telnet

Encryption, ASCII, Graphics (GIF, JPEG)

SQL, RPC

SPX, TCP, UDP

IP, IPX, DDP, Apple Talk

PPP, FDDI, IEEE 802.5, HDLC, FR

FDDI, B8ZS, RJ45

Percent of IoTDevicesVulnerable to anAttack

70%source: http://h20195.www2.hp.com/V2/GetDocument.aspx?docname=4AA5-4759ENW&cc=us&lc=en

Percent ofWebServiceswithHighRiskVulnerabilities

60%source: https://betanews.com/2016/06/08/web-services-mobile-apis-security-vulnerabilities/

API

OSVulnerabilities (in 2014)

24source: https://techtalk.gfi.com/most-vulnerable-operating-systems-and-applications-in-2014/

Mac OS X

Windows Server

Linux Kernel

2664

741267

$252M

$35M in IT Repairs

Security is important… it’s hard…and it needs to be implementedateach layer.

InOtherWords

There are several open sourceprojects designed tomakenetworkingand security easier.

TheGoodNews

Flannel for networking



Session (Layer 5)

Transport(Layer 4)

Network (Layer 3)

Data Link (Layer 2)

Physical (Layer 1)

Flannel provides easy tousenetworking viaVXLANoverlays.

While flexible, it is oneof theeasiest open sourcenetworking solutions available today.

Project Calico for L3-4 security



Session (Layer 5)

Transport(Layer 4)

Network (Layer 3)

Data Link (Layer 2)

Physical (Layer 1)

Enforcedat thehost node, Project Calicoallowsyou to restrict access (incomingandoutgoing) atthenetworkand transport layers.

This layer is critical as it prevents compromisedservices or pods fromhaving free range/ accesswithin thenetwork.

Istio for L5-7networking& security



Session (Layer 5)

Transport(Layer 4)

Network (Layer 3)

Data Link (Layer 2)

Physical (Layer 1)

Enforced inside thepodasa sidecar, Istio allowsyou to restrict access (incomingandoutgoing) attheapplication, presentation, and session layers.

This layer is the first defenseas it preventsmanyofthemost common types of attacks, and is able todetermalicious users before they reach thenetwork.



Session (Layer 5)

Transport(Layer 4)

Network (Layer 3)

Data Link (Layer 2)

Physical (Layer 1)

HTTP, FTP, Telnet


SQL, RPC

SPX, TCP, UDP



FDDI, B8ZS, RJ45

ReducingAttack Surface via Policy Enforcement

By combining Calico and Istio, you are to enforce policies onLayers 3-7.

While Istio operates inside thepod to restrict access to otherproxy-enabled pods, Calico isenforced at the host node, helping prevent attacks fromcompromised services.

» http://bit.ly/istio_calico

Installing

InstallationOptions

1

2

3

Install Flannel and Calico individually, then manually configure

Install just Calico for networking and isolation policies, and then configure manually

Use Canal, an installer script that installs and configures Flannel with Calico

InstallationOptions

1

2 https://docs.projectcalico.org

https://coreos.com/flannel

InstallationOptions3 Use Canal, an installer script that installs and configures

Flannel with Calico

kubectl apply -f https://raw.githubusercontent.com/projectcalico/canal/master/k8s-install/1.6/rbac.yaml

kubectl apply -f https://raw.githubusercontent.com/projectcalico/canal/master/k8s-install/1.6/canal.yaml

kubectl apply -f https://raw.githubusercontent.com/projectcalico/canal/master/k8s-install/canal.yaml

1.6+

1.5

InstallationOptions3 Use Canal, an installer script that installs and configures

Flannel with Calico

https://github.com/projectcalico/canal

Configuring Policies

Configuring Policies1 Create policy files

kind: PodapiVersion: v1metadata:name: clientnamespace: policy-demolabels:run: client

spec:containers:- name: busyboximage: busyboxargs:- sleep- "10000"

kind: NetworkPolicyapiVersion: extensions/v1beta1metadata:name: access-nginxnamespace: policy-demo

spec:podSelector:matchLabels:run: nginx

ingress:- from:- podSelector:

matchLabels:run: client

pod.yaml network-policy.yaml


2 Create a namespace called “policy-demo” as previously specified in our policy YAML files.

kubectl create ns policy-demo


3 Launch and expose pods in “policy-demo” namespace

kubectl run --namespace=policy-demo nginx --replicas=2 --image=nginx

kubectl expose --namespace=policy-demo deployment nginx --port=80



4 Enable isolation within Kubernetes

kubectl annotate ns policy-demo "net.beta.kubernetes.io/network-policy={\"ingress\":{\"isolation\":\"DefaultDeny\"}}"



5 Apply network-policy.yaml, allowing access from client pods.

kubectl create -f network-policy.yaml


More advanced policies can be defined by using ingress and egress, as well as utilizing actions and tags.

kind: profilemetadata:name: k8s_ns.advanced-policy-demotags: - k8s_ns.advanced-policy-demospec:

egress:- action: allow

destination: {}source: {}

ingress: - action: deny

destination: {}source: {}

DoingMorewith Calico

You can also apply multiple policies (with lower order taking precedence) based on selectors, protocols, ports, source, destination, and ICMP (Internet Control Message Protocol).

kind: policy metadata:

name: advanced-policy-demo.allow-dnsspec:

selector: has(calico/k8s_ns) order: 400 egress:- action: allow

protocol: udpdestination:

selector: calico/k8s_ns == 'kube-system' && k8s-app == 'kube-dns'

ports: [53]

DoingMorewith Calico

Try It Yourselfprojectcalico.org/demo

Installing

Installing

1

2

3

Download and extract the installation file

Check RBAC Settings

curl -L https://git.io/getIstio | sh -

Add the istioctl client to your PATH

export PATH=$PWD/bin:$PATH

kubectl api-versions | grep rbac

RBACSettingsMapIf error – continue to step

If it returns ”alpha” WITHOUT “beta” run the following configuration:

If it returns “beta” or both “beta” and “alpha” run Istio RBAC configuration:

kubectl apply -f install/kubernetes/istio-rbac-alpha.yaml

kubectl apply -f install/kubernetes/istio-rbac-beta.yaml

If you receive a “Forbidden” error, create clusterrolebinding:

kubectl create clusterrolebinding myname-cluster-admin-binding --clusterrole=cluster-admin [email protected]

4

Installing

4 Install Istio without the Auth module:

kubectl apply -f install/kubernetes/istio.yaml

Advanced: Install Istio with the Auth module:

kubectl apply -f install/kubernetes/istio-auth.yaml


Configuring Ingress1 Create simple-istio-policy.yaml file

apiVersion: extensions/v1beta1kind: Ingressmetadata:name: simple-istio-ingressannotations:kubernetes.io/ingress.class: istio

spec:rules:- http:

paths:- path: /headersbackend:serviceName: httpbinservicePort: 8000

- path: /delay/.*backend:serviceName: httpbinservicePort: 8000

Configuring Ingress

2 Apply simple-istio-policy.yaml

kubectl create -f simple-istio-policy.yaml

Configuring Egress

1 Create simple-egress-istio-policy.yaml file

apiVersion: v1kind: Servicemetadata:name: securegooglespec:type: ExternalNameexternalName: www.google.comports:- port: 443# important to set protocol namename: https

Configuring Egress

2 Apply simple-egress-istio-policy.yaml

kubectl create -f simple-egress-istio-policy.yaml

Beyond ingress and egress policy management at the pod level, Istio comes with many more features including:

• Request Routing and Load Balancing

• Managing Request Timeouts

• Fault Injection and Rate Limiting

• Simple Access Control and Logging

DoingMorewith Istio

LearnMoreatistio.io

WrappingUp



Session (Layer 5)

Transport(Layer 4)

Network (Layer 3)

Data Link (Layer 2)

Physical (Layer 1)

HTTP, FTP, Telnet


SQL, RPC

SPX, TCP, UDP



FDDI, B8ZS, RJ45

TheEndResult

You now have a network that isboth scalable, and more secure. Helping protect yourapplications, user data, andinfrastructure from a myriad ofattacks by significantly reducingthe attack surface.

However, this is still just thebeginning, as security meansaddressing each layer withmultiple barriers.

GetHelp& EarnAwesomePrizes

Join the Tigera MVP Program

http://mvp.tigera.io

Get Support and Free Help on Slack: http://projectcalico.org/community

Security is about layers. Onions have layers. Ogres have layers. Has anyone ever hacked

anOnionor anOgre?

THANKYOU!!!!@mikegstowe @tigeraio

Secure Networking for Kubernetes

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