Deploying TLS Securely

First, let's just agree that supporting SSLv3 is no longer a good idea, and that all old versions of SSL should be disabled by default.  In fact, if I could add one item to the Top 10 Hardcore Security Features in 11.5, it would be SSLv3 being disabled by default in the Client SSL profile: SOL15022 - SSLv3 protocol is disabled in the DEFAULT SSL ciphers.  This change in behavior is very safe from a browser support perspective, especially with IE6 seeing the last nails in its coffin. Wikipedia has a nice entry on the broad browser support for TLS 1.0, and the rapidly growing support of TLS 1.1 and 1.2. 

The death of IE6 and the rapid growth of browser-share for both Google Chrome and Mozilla FireFox, which are auto-updating, bodes well for TLS 1.1 and 1.2.  Many reports estimate Chrome and FireFox combined for between 60-80% browser share in 2013, with Chrome leading the way at 40-60%.  IE8-10 still have some significant presence, but TLS 1.1 and 1.2 support is easily turned on in these browsers, though this might increase customer support call volume a bit. (Citations: 1, 2, 3)

So, BIG-IP is an excellent platform for enforcing good transport encryption of your application.  Via the Client SSL profile, it's fairly easy to set the certificate and key, the supported ciphers, and even SSL/TLS versions supported.  A well-covered topic on DevCentral, the TLS handshake itself subject to many attacks, such as BEAST, CRIME/BREACH. and Lucky 13 to name only a few.  Our good friend David Holmes wrote up a nice post awhile back on "Getting Good Grades on your SSL", and referenced the great tool available on SSLLabs.com, called Pulse.  SSL Labs also has a detailed paper on TLS Best Practices that's a primary reference for the BIG-IP configurations that will help you shine in your next Pulse report. You may also want to check out the good work our friends at OWASP are doing with their TLS Protection Cheat Sheet.

So, let's get to work on improving that report card from Pulse.  First, you'll want to make sure you've got a handle on SOL10167 and SOL8802, which cover the Client SSL Profile and configuring cipher strength, respectively.  Attack-by-attack, we'll cover some settings that will help you mitigate via BIG-IP:

  • Renegotiation attacks: When this attack vector against SSL 3.0 and all versions of TLS was first published in August 2009, there seemed to be no immediate remediation, but a 2-line iRule disabling Renegotiation provided an immediate fix for any F5 administrator.  Subsequent versions of TMOS since v10.1.0 have added a checkbox to disable renegotiation altogether, however, disabling renegotiation introduces some other security problems and incompatibility with client certificates.  RFC5746 for secure renegotiation has since been proposed, and is implemented in TMOS since v10.2.3.  All modern browsers support secure renegotiation, but in order to support any older browsers, choose the "Require" option to accept initial handshakes only from those unpatched clients.
  • CRIME, BEAST, TIME, and Lucky 13: Fortunately for me, all the heavy-lifting has been done by our own Jeff Costlow, and I encourage you to review his excellent post on TLS from last year.

Summary of recommendations:

  • Disable SSLv2 and SSLv3 (No SSLv2, No SSLv3 in Client SSL profile).
  • Disable TLSv1.0 (No TLS 1.0) if you are concerned about BEAST, but beware possible browser support issues.
  • Require Secure Renegotiation
  • Use a cipher string a little stronger than the DEFAULT, for example:
    • "!SSLv2:!EXPORT:ECDHE+AES-GCM:ECDHE+AES:ECDHE+3DES:RSA+AES-GCM:RSA+AES:RSA+3DES:-MD5:-SSLv3:-RC4"
    • If you're running 11.5.0 or better, you may want to consider ordering AES-GCM at the top of preference.
  • Stay up to date on current versions of TMOS, the evolving capabilities to control TLS handshaking, and new vulnerabilities.

How is controlling and enforcing good, strong TLS-handshaking influencing your BIG-IP infrastructure? I'm interested to hear in the comments below.

 
Published Mar 10, 2014
Version 1.0

9 Comments

  • IIRC, with modify, you need to pass the attributes you are wanting to patch in as kwargs instead of setting the attributes directly as with the update method.

    • Bhudson's avatar
      Bhudson
      Icon for Nimbostratus rankNimbostratus

      Thanks Jason. Amended code below works as desired. Chalk this up to a mistake with understanding kwargs and python. Executing the code below yields a curl command that shows the data element correctly as well.

       

      from f5.bigip import ManagementRoot

      from f5.utils.responses.handlers import Stats

      import json

       

      mgmt = ManagementRoot(hostname=<myIPHere>, username=<myusername>, password=<mypassword>, token=True, debug=True);

       

      myPool = mgmt.tm.ltm.pools.pool.load(partition='Common', name='<pool name>')

       

      myPoolMembers = myPool.members_s.get_collection()

       

      for poolMember in myPoolMembers:

      print(poolMember.raw)

      poolMember.modify(session='user-disabled')

       

      # Here only to get curl commands for debug purposes

      for x in mgmt.debug_output:

      print()

      print(x)

       

       

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Using Direct Server Return (DSR) in Kubernetes can have benefits when you have workloads that require low latency, high throughput, and/or you want to preserve the source IP address of the connection. The following will guide you through how to configure Kubernetes and BIG-IP to use DSR for traffic to a Kubernetes Pod.

Why DSR?

I’m not a huge fan of DSR. It’s a weird way of having a client send traffic to a Load Balancer (LB), the LB forwards to a backend server WITHOUT rewriting the destination address, and the backend server responds directly back to the client.

It looks WEIRD! But there are some benefits, the backend server sees the original client IP address without the need for the LB to be in the return path of traffic and the LB only has to handle one side of the connection. This is also the downside because it’s not straightforward to do any type of intelligent LB if you only see half the conversation. It also involves doing weird things on your backend servers to configure loopback devices so that it will answer for the traffic when it is received, but not create an IP conflict on the network.

DSR in Kubernetes

The following uses IP Virtual Server (IPVS) to setup DSR in Kubernetes. IPVS has been supported in Kubernetes since 1.11. When using IPVS it replaces IP Tables for the kube-proxy (internal LB). When you provision a LoadBalancer or NodePort service (method to expose traffic outside the cluster) you can add “externalTrafficPolicy: Local” to enable DSR. This is mentioned in the Kubernetes documentation for GCP and Azure environments.

DSR in BIG-IP

On the BIG-IP DSR is referred to as “nPath”. K11116 discusses the steps involved in getting it setup. The steps create a profile that will disable destination address translation and allow the BIG-IP to not maintain the state of TCP connections (since it will only see half the conversation).

Putting the Pieces Together

To enable DSR from Kubernetes the first step is to create a LoadBalancer service where you define the external LB IP address. 



apiVersion: v1\nkind: Service\nmetadata:\n name: my-frontend\nspec:\n ports:\n - port: 80\n   protocol: TCP\n   targetPort: 80\n type: LoadBalancer\n loadBalancerIP: 10.1.10.10\n externalTrafficPolicy: Local\n selector:\n   run: my-frontend\n\n


After you create the service you need to update Service to add the following status (example in YAML format, this needs to be done via the API vs. kubectl):


 status:\n   loadBalancer:\n     ingress:\n     - ip: 10.1.10.10\n\n


Once this is done you run “ipvsadm -ln” to verify that you now have an IPVS rule to rewrite the destination address to the Pod IP Address.


IP Virtual Server version 1.2.1 (size=4096)\nProt LocalAddress:Port Scheduler Flags\n -> RemoteAddress:Port          Forward Weight ActiveConn InActConn\n..\nTCP 10.1.10.10:80 rr\n -> 10.233.90.25:80             Masq   1     0         0\n -> 10.233.90.28:80             Masq   1     0         0\n…\n\n


You can verify that DSR is working by connecting to the external IP address and observing that the MAC address that the traffic is sent to is different than the MAC address that the reply is sent from.


$ sudo tcpdump -i eth1 -nnn -e host 10.1.10.10\n…\n01:30:02.579765 06:ba:49:38:53:f0 > 06:1f:8a:6c:8e:d2, ethertype IPv4 (0x0800), length 143: 10.1.10.100.37664 > 10.1.10.10.80: Flags [P.], seq 1:78, ack 1, win 229, options [nop,nop,TS val 3625903493 ecr 3191715024], length 77: HTTP: GET /txt HTTP/1.1 \n01:30:02.582457 06:d2:0a:b1:14:20 > 06:ba:49:38:53:f0, ethertype IPv4 (0x0800), length 66: 10.1.10.10.80 > 10.1.10.100.37664: Flags [.], ack 78, win 227, options [nop,nop,TS val 3191715027 ecr 3625903493], length 0 \n01:30:02.584176 06:d2:0a:b1:14:20 > 06:ba:49:38:53:f0, ethertype IPv4 (0x0800), length 692: 10.1.10.10.80 > 10.1.10.100.37664: Flags [P.], seq 1:627, ack 78, win 227, options [nop,nop,TS val 3191715028 ecr 3625903493], length 626: HTTP: HTTP/1.1 200 OK\n...\n


Automate it

Using Container Ingress Services we can automate this setup with the following AS3 declaration (note the formatting is off and this will not copy-and-paste cleanly, only provided for illustrative purposes).


kind: ConfigMap\napiVersion: v1\nmetadata:\n  name: f5demo-as3-configmap\n  namespace: default\n  labels:\n    f5type: virtual-server\n    as3: \"true\"\ndata:\n  template: |\n{\n  \"class\": \"AS3\",\n  \"action\": \"deploy\",\n  \"declaration\": {\n    \"class\": \"ADC\",\n    \"schemaVersion\": \"3.10.0\",\n    \"id\": \"DSR Demo\",\n    \"AS3\": {\n      \"class\": \"Tenant\",\n      \"MyApps\": {\n        \"class\": \"Application\",\n        \"template\": \"shared\",\n        \"frontend_pool\": {\n          \"members\": [\n            {\n              \"servicePort\": 80,\n              \"serverAddresses\": []\n            }\n          ],\n          \"monitors\": [\n            \"http\"\n          ],\n          \"class\": \"Pool\"\n        },\n        \"l2dsr_http\": {\n          \"layer4\": \"tcp\",\n          \"pool\": \"frontend_pool\",\n          \"persistenceMethods\": [],\n          \"sourcePortAction\": \"preserve-strict\",\n          \"translateServerAddress\": false,\n          \"translateServerPort\": false,\n          \"class\": \"Service_L4\",\n          \"profileL4\": {\n            \"use\": \"fastl4_dsr\"\n          },\n          \"virtualAddresses\": [\n            \"10.1.10.10\"\n          ],\n          \"virtualPort\": 80,\n          \"snat\": \"none\"\n        },\n        \"dsrhash\": {\n          \"hashAlgorithm\": \"carp\",\n          \"class\": \"Persist\",\n          \"timeout\": \"indefinite\",\n          \"persistenceMethod\": \"source-address\"\n        },\n        \"fastl4_dsr\": {\n          \"looseClose\": true,\n          \"looseInitialization\": true,\n          \"resetOnTimeout\": false,\n          \"class\": \"L4_Profile\"\n        }\n      }\n    }\n  }\n}\n\n


You can then have the BIG-IP automatically pick-up the location of the pods by annotating the service.



apiVersion: v1\nkind: Service\nmetadata:\n  name: my-frontend\n  labels:\n    run: my-frontend\n    cis.f5.com/as3-tenant: AS3\n    cis.f5.com/as3-app: MyApps\n    cis.f5.com/as3-pool: frontend_pool\n...\n


Not so weird?

DSR is a weird way to load balance traffic, but it can have some benefits. For a more exhaustive list of the reasons not to do DSR; we can reach back to 2008 for the following gem from Lori MacVittie. What is old is new again!


","body@stringLength":"9776","rawBody":"

Using Direct Server Return (DSR) in Kubernetes can have benefits when you have workloads that require low latency, high throughput, and/or you want to preserve the source IP address of the connection. The following will guide you through how to configure Kubernetes and BIG-IP to use DSR for traffic to a Kubernetes Pod.

Why DSR?

I’m not a huge fan of DSR. It’s a weird way of having a client send traffic to a Load Balancer (LB), the LB forwards to a backend server WITHOUT rewriting the destination address, and the backend server responds directly back to the client.

It looks WEIRD! But there are some benefits, the backend server sees the original client IP address without the need for the LB to be in the return path of traffic and the LB only has to handle one side of the connection. This is also the downside because it’s not straightforward to do any type of intelligent LB if you only see half the conversation. It also involves doing weird things on your backend servers to configure loopback devices so that it will answer for the traffic when it is received, but not create an IP conflict on the network.

DSR in Kubernetes

The following uses IP Virtual Server (IPVS) to setup DSR in Kubernetes. IPVS has been supported in Kubernetes since 1.11. When using IPVS it replaces IP Tables for the kube-proxy (internal LB). When you provision a LoadBalancer or NodePort service (method to expose traffic outside the cluster) you can add “externalTrafficPolicy: Local” to enable DSR. This is mentioned in the Kubernetes documentation for GCP and Azure environments.

DSR in BIG-IP

On the BIG-IP DSR is referred to as “nPath”. K11116 discusses the steps involved in getting it setup. The steps create a profile that will disable destination address translation and allow the BIG-IP to not maintain the state of TCP connections (since it will only see half the conversation).

Putting the Pieces Together

To enable DSR from Kubernetes the first step is to create a LoadBalancer service where you define the external LB IP address. 



apiVersion: v1\nkind: Service\nmetadata:\n name: my-frontend\nspec:\n ports:\n - port: 80\n   protocol: TCP\n   targetPort: 80\n type: LoadBalancer\n loadBalancerIP: 10.1.10.10\n externalTrafficPolicy: Local\n selector:\n   run: my-frontend\n\n


After you create the service you need to update Service to add the following status (example in YAML format, this needs to be done via the API vs. kubectl):


 status:\n   loadBalancer:\n     ingress:\n     - ip: 10.1.10.10\n\n


Once this is done you run “ipvsadm -ln” to verify that you now have an IPVS rule to rewrite the destination address to the Pod IP Address.


IP Virtual Server version 1.2.1 (size=4096)\nProt LocalAddress:Port Scheduler Flags\n -> RemoteAddress:Port          Forward Weight ActiveConn InActConn\n..\nTCP 10.1.10.10:80 rr\n -> 10.233.90.25:80             Masq   1     0         0\n -> 10.233.90.28:80             Masq   1     0         0\n…\n\n


You can verify that DSR is working by connecting to the external IP address and observing that the MAC address that the traffic is sent to is different than the MAC address that the reply is sent from.


$ sudo tcpdump -i eth1 -nnn -e host 10.1.10.10\n…\n01:30:02.579765 06:ba:49:38:53:f0 > 06:1f:8a:6c:8e:d2, ethertype IPv4 (0x0800), length 143: 10.1.10.100.37664 > 10.1.10.10.80: Flags [P.], seq 1:78, ack 1, win 229, options [nop,nop,TS val 3625903493 ecr 3191715024], length 77: HTTP: GET /txt HTTP/1.1 \n01:30:02.582457 06:d2:0a:b1:14:20 > 06:ba:49:38:53:f0, ethertype IPv4 (0x0800), length 66: 10.1.10.10.80 > 10.1.10.100.37664: Flags [.], ack 78, win 227, options [nop,nop,TS val 3191715027 ecr 3625903493], length 0 \n01:30:02.584176 06:d2:0a:b1:14:20 > 06:ba:49:38:53:f0, ethertype IPv4 (0x0800), length 692: 10.1.10.10.80 > 10.1.10.100.37664: Flags [P.], seq 1:627, ack 78, win 227, options [nop,nop,TS val 3191715028 ecr 3625903493], length 626: HTTP: HTTP/1.1 200 OK\n...\n


Automate it

Using Container Ingress Services we can automate this setup with the following AS3 declaration (note the formatting is off and this will not copy-and-paste cleanly, only provided for illustrative purposes).


kind: ConfigMap\napiVersion: v1\nmetadata:\n  name: f5demo-as3-configmap\n  namespace: default\n  labels:\n    f5type: virtual-server\n    as3: \"true\"\ndata:\n  template: |\n{\n  \"class\": \"AS3\",\n  \"action\": \"deploy\",\n  \"declaration\": {\n    \"class\": \"ADC\",\n    \"schemaVersion\": \"3.10.0\",\n    \"id\": \"DSR Demo\",\n    \"AS3\": {\n      \"class\": \"Tenant\",\n      \"MyApps\": {\n        \"class\": \"Application\",\n        \"template\": \"shared\",\n        \"frontend_pool\": {\n          \"members\": [\n            {\n              \"servicePort\": 80,\n              \"serverAddresses\": []\n            }\n          ],\n          \"monitors\": [\n            \"http\"\n          ],\n          \"class\": \"Pool\"\n        },\n        \"l2dsr_http\": {\n          \"layer4\": \"tcp\",\n          \"pool\": \"frontend_pool\",\n          \"persistenceMethods\": [],\n          \"sourcePortAction\": \"preserve-strict\",\n          \"translateServerAddress\": false,\n          \"translateServerPort\": false,\n          \"class\": \"Service_L4\",\n          \"profileL4\": {\n            \"use\": \"fastl4_dsr\"\n          },\n          \"virtualAddresses\": [\n            \"10.1.10.10\"\n          ],\n          \"virtualPort\": 80,\n          \"snat\": \"none\"\n        },\n        \"dsrhash\": {\n          \"hashAlgorithm\": \"carp\",\n          \"class\": \"Persist\",\n          \"timeout\": \"indefinite\",\n          \"persistenceMethod\": \"source-address\"\n        },\n        \"fastl4_dsr\": {\n          \"looseClose\": true,\n          \"looseInitialization\": true,\n          \"resetOnTimeout\": false,\n          \"class\": \"L4_Profile\"\n        }\n      }\n    }\n  }\n}\n\n


You can then have the BIG-IP automatically pick-up the location of the pods by annotating the service.



apiVersion: v1\nkind: Service\nmetadata:\n  name: my-frontend\n  labels:\n    run: my-frontend\n    cis.f5.com/as3-tenant: AS3\n    cis.f5.com/as3-app: MyApps\n    cis.f5.com/as3-pool: frontend_pool\n...\n


Not so weird?

DSR is a weird way to load balance traffic, but it can have some benefits. For a more exhaustive list of the reasons not to do DSR; we can reach back to 2008 for the following gem from Lori MacVittie. What is old is new again!


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FYI, if you want to emulate this in your lab, here is how I did the update via the API.

$ kubectl proxy --port=8001

next you need to dump the status of the service

$  curl -s http://localhost:8001/api/v1/namespaces/default/services/my-frontend/status  > service.json

edit the output to add the ingress.

...\n  \"status\": {\n    \"loadBalancer\": {\n      \"ingress\": [\n        {\n          \"ip\": \"10.1.10.10\"\n        }\n      ]\n    }\n  }\n}

Then update the status.

curl -s http://localhost:8001/api/v1/namespaces/default/services/my-frontend/status -X PUT --data-binary @service.json -H content-type:application/json -v
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