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Code Issues Releases Wiki Activity

Fixes Issue #494 - add tests for CIS 1.5 (#530)

Browse Source 
* Initial commit.

* Add master and node config.

* Add section 5 of CIS 1.5.1.

* Split sections into section files

* Fix YAML issues.

* adds target translation

* adds target translation

* adds cis-1.5 mapping

* fixed tests

* fixes are per PR

* fixed intergration test

* integration kind test file to appropriate ks8 version

* fixed etcd text

* fixed README

* fixed text

* etcd: fixed grep path

* etcd: fixes

* fixed error message bug

* Update README.md

Co-Authored-By: Liz Rice <liz@lizrice.com>

* Update README.md

Co-Authored-By: Liz Rice <liz@lizrice.com>

* fixes as per PR review
This commit is contained in:
Roberto Rojas 2019-12-05 15:55:44 -05:00 committed by GitHub
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24
README.md
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@ -42,12 +42,13 @@ Table of Contents
## CIS Kubernetes Benchmark support
kube-bench supports the tests for Kubernetes as defined in the CIS Benchmarks 1.3.0 to 1.4.1 respectively.
kube-bench supports the tests for Kubernetes as defined in the CIS Benchmarks 1.3.0 to 1.5.0 respectively.
| CIS Kubernetes Benchmark | kube-bench config | Kubernetes versions |
|---|---|---|
| 1.3.0| cis-1.3 | 1.11-1.12 |
| 1.4.1| cis-1.4 | 1.13- |
| 1.4.1| cis-1.4 | 1.13-1.14 |
| 1.5.0 | cis-1.5 | 1.15- |
By default, kube-bench will determine the test set to run based on the Kubernetes version running on the machine.
@ -97,6 +98,25 @@ Alternatively, you can specify `--benchmark` to run a specific CIS Benchmark ver
kube-bench node --benchmark cis-1.4
```
If you want to target specific CIS Benchmark `target` (i.e master, node, etcd, etc...)
you can use the `run --targets` subcommand.
```
kube-bench --benchmark cis-1.4 run --targets master,node
```
or
```
kube-bench --benchmark cis-1.5 run --targets master,node,etcd,policies
```
The following table shows the valid targets based on the CIS Benchmark version.
| CIS Benchmark | Targets |
|---|---|
| cis-1.3| master, node |
| cis-1.4| master, node |
| cis-1.5| master, controlplane, node, etcd, policies |
If no targets are specified, `kube-bench` will determine the appropriate targets based on the CIS Benchmark version.
`controls` for the various versions of CIS Benchmark can be found in directories
with same name as the CIS Benchmark versions under `cfg/`, for example `cfg/cis-1.4`.

2
cfg/cis-1.5/config.yaml Normal file
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@ -0,0 +1,2 @@
---
## Version-specific settings that override the values in cfg/config.yaml

35
cfg/cis-1.5/controlplane.yaml Normal file
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@ -0,0 +1,35 @@
---
controls:
version: 1.5
id: 3
text: "Control Plane Configuration"
type: "controlplane"
groups:
- id: 3.1
text: "Authentication and Authorization"
checks:
- id: 3.1.1
text: "Client certificate authentication should not be used for users (Not Scored) "
type: "manual"
remediation: |
Alternative mechanisms provided by Kubernetes such as the use of OIDC should be
implemented in place of client certificates.
scored: false
- id: 3.2
text: "Logging"
checks:
- id: 3.2.1
text: "Ensure that a minimal audit policy is created (Scored) "
type: "manual"
remediation: |
Create an audit policy file for your cluster.
scored: true
- id: 3.2.2
text: "Ensure that the audit policy covers key security concerns (Not Scored) "
type: "manual"
remediation: |
Consider modification of the audit policy in use on the cluster to include these items, at a
minimum.
scored: false

131
cfg/cis-1.5/etcd.yaml Normal file
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@ -0,0 +1,131 @@
---
controls:
version: 1.15
id: 2
text: "Etcd Node Configuration"
type: "etcd"
groups:
- id: 2
text: "Etcd Node Configuration Files"
checks:
- id: 2.1
text: "Ensure that the --cert-file and --key-file arguments are set as appropriate (Scored)"
audit: "/bin/ps -ef | /bin/grep $etcdbin | /bin/grep -v grep"
tests:
bin_op: and
test_items:
- flag: "--cert-file"
set: true
- flag: "--key-file"
set: true
remediation: |
Follow the etcd service documentation and configure TLS encryption.
Then, edit the etcd pod specification file /etc/kubernetes/manifests/etcd.yaml
on the master node and set the below parameters.
--cert-file=</path/to/ca-file>
--key-file=</path/to/key-file>
scored: true
- id: 2.2
text: "Ensure that the --client-cert-auth argument is set to true (Scored)"
audit: "/bin/ps -ef | /bin/grep $etcdbin | /bin/grep -v grep"
tests:
test_items:
- flag: "--client-cert-auth"
compare:
op: eq
value: true
set: true
remediation: |
Edit the etcd pod specification file $etcdconf on the master
node and set the below parameter.
--client-cert-auth="true"
scored: true
- id: 2.3
text: "Ensure that the --auto-tls argument is not set to true (Scored)"
audit: "/bin/ps -ef | /bin/grep $etcdbin | /bin/grep -v grep"
tests:
bin_op: or
test_items:
- flag: "--auto-tls"
set: false
- flag: "--auto-tls"
compare:
op: eq
value: false
remediation: |
Edit the etcd pod specification file $etcdconf on the master
node and either remove the --auto-tls parameter or set it to false.
--auto-tls=false
scored: true
- id: 2.4
text: "Ensure that the --peer-cert-file and --peer-key-file arguments are
set as appropriate (Scored)"
audit: "/bin/ps -ef | /bin/grep $etcdbin | /bin/grep -v grep"
tests:
bin_op: and
test_items:
- flag: "--peer-cert-file"
set: true
- flag: "--peer-key-file"
set: true
remediation: |
Follow the etcd service documentation and configure peer TLS encryption as appropriate
for your etcd cluster. Then, edit the etcd pod specification file $etcdconf on the
master node and set the below parameters.
--peer-client-file=</path/to/peer-cert-file>
--peer-key-file=</path/to/peer-key-file>
scored: true
- id: 2.5
text: "Ensure that the --peer-client-cert-auth argument is set to true (Scored)"
audit: "/bin/ps -ef | /bin/grep $etcdbin | /bin/grep -v grep"
tests:
test_items:
- flag: "--peer-client-cert-auth"
compare:
op: eq
value: true
set: true
remediation: |
Edit the etcd pod specification file $etcdconf on the master
node and set the below parameter.
--peer-client-cert-auth=true
scored: true
- id: 2.6
text: "Ensure that the --peer-auto-tls argument is not set to true (Scored)"
audit: "/bin/ps -ef | /bin/grep $etcdbin | /bin/grep -v grep"
tests:
bin_op: or
test_items:
- flag: "--peer-auto-tls"
set: false
- flag: "--peer-auto-tls"
compare:
op: eq
value: false
set: true
remediation: |
Edit the etcd pod specification file $etcdconf on the master
node and either remove the --peer-auto-tls parameter or set it to false.
--peer-auto-tls=false
scored: true
- id: 2.7
text: "Ensure that a unique Certificate Authority is used for etcd (Not Scored)"
audit: "/bin/ps -ef | /bin/grep $etcdbin | /bin/grep -v grep"
tests:
test_items:
- flag: "--trusted-ca-file"
set: true
remediation: |
[Manual test]
Follow the etcd documentation and create a dedicated certificate authority setup for the
etcd service.
Then, edit the etcd pod specification file $etcdconf on the
master node and set the below parameter.
--trusted-ca-file=</path/to/ca-file>
scored: false

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505
cfg/cis-1.5/node.yaml Normal file
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@ -0,0 +1,505 @@
---
controls:
version: 1.5
id: 4
text: "Worker Node Security Configuration"
type: "node"
groups:
- id: 4.1
text: "Worker Node Configuration Files"
checks:
- id: 4.1.1
text: "Ensure that the kubelet service file permissions are set to 644 or more restrictive (Scored)"
audit: '/bin/sh -c ''if test -e $kubeletsvc; then stat -c %a $kubeletsvc; fi'' '
tests:
test_items:
- flag: "644"
set: true
compare:
op: eq
value: "644"
- flag: "640"
set: true
compare:
op: eq
value: "640"
- flag: "600"
set: true
compare:
op: eq
value: "600"
bin_op: or
remediation: |
Run the below command (based on the file location on your system) on the each worker node.
For example,
chmod 755 $kubeletsvc
scored: true
- id: 4.1.2
text: "Ensure that the kubelet service file ownership is set to root:root (Scored)"
audit: '/bin/sh -c ''if test -e $kubeletsvc; then stat -c %U:%G $kubeletsvc; fi'' '
tests:
test_items:
- flag: root:root
set: true
remediation: |
Run the below command (based on the file location on your system) on the each worker node.
For example,
chown root:root $kubeletsvc
scored: true
- id: 4.1.3
text: "Ensure that the proxy kubeconfig file permissions are set to 644 or more restrictive (Scored)"
audit: '/bin/sh -c ''if test -e $proxykubeconfig; then stat -c %a $proxykubeconfig; fi'' '
tests:
test_items:
- flag: "644"
set: true
compare:
op: eq
value: "644"
- flag: "640"
set: true
compare:
op: eq
value: "640"
- flag: "600"
set: true
compare:
op: eq
value: "600"
bin_op: or
remediation: |
Run the below command (based on the file location on your system) on the each worker node.
For example,
chmod 644 $proykubeconfig
scored: true
- id: 4.1.4
text: "Ensure that the proxy kubeconfig file ownership is set to root:root (Scored)"
audit: '/bin/sh -c ''if test -e $proxykubeconfig; then stat -c %U:%G $proxykubeconfig; fi'' '
tests:
test_items:
- flag: root:root
set: true
remediation: |
Run the below command (based on the file location on your system) on the each worker node.
For example, chown root:root $proxykubeconfig
scored: true
- id: 4.1.5
text: "Ensure that the kubelet.conf file permissions are set to 644 or more restrictive (Scored)"
audit: '/bin/sh -c ''if test -e $kubeletkubeconfig; then stat -c %a $kubeletkubeconfig; fi'' '
tests:
test_items:
- flag: "644"
set: true
compare:
op: eq
value: "644"
- flag: "640"
set: true
compare:
op: eq
value: "640"
- flag: "600"
set: true
compare:
op: eq
value: "600"
bin_op: or
remediation: |
Run the below command (based on the file location on your system) on the each worker node.
For example,
chmod 644 $kubeletkubeconfig
scored: true
- id: 4.1.6
text: "Ensure that the kubelet.conf file ownership is set to root:root (Scored)"
audit: '/bin/sh -c ''if test -e $kubeletkubeconfig; then stat -c %U:%G $kubeletkubeconfig; fi'' '
tests:
test_items:
- flag: root:root
set: true
compare:
op: eq
value: root:root
remediation: |
Run the below command (based on the file location on your system) on the each worker node.
For example,
chown root:root $kubeletkubeconfig
scored: true
- id: 4.1.7
text: "Ensure that the certificate authorities file permissions are set to 644 or more restrictive (Scored)"
types: "manual"
remediation: |
Run the following command to modify the file permissions of the
--client-ca-file chmod 644 <filename>
scored: true
- id: 4.1.8
text: "Ensure that the client certificate authorities file ownership is set to root:root (Scored)"
audit: '/bin/sh -c ''if test -e $kubeletcafile; then stat -c %U:%G $kubeletcafile; fi'' '
tests:
test_items:
- flag: root:root
set: true
compare:
op: eq
value: root:root
remediation: |
Run the following command to modify the ownership of the --client-ca-file.
chown root:root <filename>
scored: true
- id: 4.1.9
text: "Ensure that the kubelet configuration file has permissions set to 644 or more restrictive (Scored)"
audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c %a $kubeletconf; fi'' '
tests:
test_items:
- flag: "644"
set: true
compare:
op: eq
value: "644"
- flag: "640"
set: true
compare:
op: eq
value: "640"
- flag: "600"
set: true
compare:
op: eq
value: "600"
bin_op: or
remediation: |
Run the following command (using the config file location identied in the Audit step)
chmod 644 $kubeletconf
scored: true
- id: 4.1.10
text: "Ensure that the kubelet configuration file ownership is set to root:root (Scored)"
audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c %U:%G $kubeletconf; fi'' '
tests:
test_items:
- flag: root:root
set: true
remediation: |
Run the following command (using the config file location identied in the Audit step)
chown root:root $kubeletconf
scored: true
- id: 4.2
text: "Kubelet"
checks:
- id: 4.2.1
text: "Ensure that the --anonymous-auth argument is set to false (Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: "--anonymous-auth"
path: '{.authentication.anonymous.enabled}'
set: true
compare:
op: eq
value: false
remediation: |
If using a Kubelet config file, edit the file to set authentication: anonymous: enabled to
false.
If using executable arguments, edit the kubelet service file
$kubeletsvc on each worker node and
set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
--anonymous-auth=false
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: true
- id: 4.2.2
text: "Ensure that the --authorization-mode argument is not set to AlwaysAllow (Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: --authorization-mode
path: '{.authorization.mode}'
set: true
compare:
op: nothave
value: AlwaysAllow
remediation: |
If using a Kubelet config file, edit the file to set authorization: mode to Webhook. If
using executable arguments, edit the kubelet service file
$kubeletsvc on each worker node and
set the below parameter in KUBELET_AUTHZ_ARGS variable.
--authorization-mode=Webhook
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: true
- id: 4.2.3
text: "Ensure that the --client-ca-file argument is set as appropriate (Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: --client-ca-file
path: '{.authentication.x509.clientCAFile}'
set: true
remediation: |
If using a Kubelet config file, edit the file to set authentication: x509: clientCAFile to
the location of the client CA file.
If using command line arguments, edit the kubelet service file
$kubeletsvc on each worker node and
set the below parameter in KUBELET_AUTHZ_ARGS variable.
--client-ca-file=<path/to/client-ca-file>
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: true
- id: 4.2.4
text: "Ensure that the --read-only-port argument is set to 0 (Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: "--read-only-port"
path: '{.readOnlyPort}'
set: true
compare:
op: eq
value: 0
remediation: |
If using a Kubelet config file, edit the file to set readOnlyPort to 0.
If using command line arguments, edit the kubelet service file
$kubeletsvc on each worker node and
set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
--read-only-port=0
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: true
- id: 4.2.5
text: "Ensure that the --streaming-connection-idle-timeout argument is not set to 0 (Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: --streaming-connection-idle-timeout
path: '{.streamingConnectionIdleTimeout}'
set: true
compare:
op: noteq
value: 0
- flag: --streaming-connection-idle-timeout
path: '{.streamingConnectionIdleTimeout}'
set: false
bin_op: or
remediation: |
If using a Kubelet config file, edit the file to set streamingConnectionIdleTimeout to a
value other than 0.
If using command line arguments, edit the kubelet service file
$kubeletsvc on each worker node and
set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
--streaming-connection-idle-timeout=5m
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: true
- id: 4.2.6
text: "Ensure that the --protect-kernel-defaults argument is set to true (Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: --protect-kernel-defaults
path: '{.protectKernelDefaults}'
set: true
compare:
op: eq
value: true
remediation: |
If using a Kubelet config file, edit the file to set protectKernelDefaults: true.
If using command line arguments, edit the kubelet service file
$kubeletsvc on each worker node and
set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
--protect-kernel-defaults=true
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: true
- id: 4.2.7
text: "Ensure that the --make-iptables-util-chains argument is set to true (Scored) "
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: --make-iptables-util-chains
path: '{.makeIPTablesUtilChains}'
set: true
compare:
op: eq
value: true
- flag: --make-iptables-util-chains
path: '{.makeIPTablesUtilChains}'
set: false
bin_op: or
remediation: |
If using a Kubelet config file, edit the file to set makeIPTablesUtilChains: true.
If using command line arguments, edit the kubelet service file
$kubeletsvc on each worker node and
remove the --make-iptables-util-chains argument from the
KUBELET_SYSTEM_PODS_ARGS variable.
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: true
- id: 4.2.8
text: "Ensure that the --hostname-override argument is not set (Not Scored)"
# This is one of those properties that can only be set as a command line argument.
# To check if the property is set as expected, we need to parse the kubelet command
# instead reading the Kubelet Configuration file.
audit: "/bin/ps -fC $kubeletbin "
tests:
test_items:
- flag: --hostname-override
set: false
remediation: |
Edit the kubelet service file $kubeletsvc
on each worker node and remove the --hostname-override argument from the
KUBELET_SYSTEM_PODS_ARGS variable.
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: false
- id: 4.2.9
text: "Ensure that the --event-qps argument is set to 0 or a level which ensures appropriate event capture (Not Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: --event-qps
path: '{.eventRecordQPS}'
set: true
compare:
op: eq
value: 0
remediation: |
If using a Kubelet config file, edit the file to set eventRecordQPS: to an appropriate level.
If using command line arguments, edit the kubelet service file
$kubeletsvc on each worker node and
set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: false
- id: 4.2.10
text: "Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: --tls-cert-file
path: '{.tlsCertFile}'
set: true
- flag: --tls-private-key-file
path: '{.tlsPrivateKeyFile}'
set: true
remediation: |
If using a Kubelet config file, edit the file to set tlsCertFile to the location
of the certificate file to use to identify this Kubelet, and tlsPrivateKeyFile
to the location of the corresponding private key file.
If using command line arguments, edit the kubelet service file
$kubeletsvc on each worker node and
set the below parameters in KUBELET_CERTIFICATE_ARGS variable.
--tls-cert-file=<path/to/tls-certificate-file>
--tls-private-key-file=<path/to/tls-key-file>
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: true
- id: 4.2.11
text: "Ensure that the --rotate-certificates argument is not set to false (Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: --rotate-certificates
path: '{.rotateCertificates}'
set: true
compare:
op: eq
value: true
- flag: --rotate-certificates
path: '{.rotateCertificates}'
set: false
bin_op: or
remediation: |
If using a Kubelet config file, edit the file to add the line rotateCertificates: true or
remove it altogether to use the default value.
If using command line arguments, edit the kubelet service file
$kubeletsvc on each worker node and
remove --rotate-certificates=false argument from the KUBELET_CERTIFICATE_ARGS
variable.
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: true
- id: 4.2.12
text: "Ensure that the RotateKubeletServerCertificate argument is set to true (Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: RotateKubeletServerCertificate
path: '{.featureGates.RotateKubeletServerCertificate}'
set: true
compare:
op: eq
value: true
remediation: |
Edit the kubelet service file $kubeletsvc
on each worker node and set the below parameter in KUBELET_CERTIFICATE_ARGS variable.
--feature-gates=RotateKubeletServerCertificate=true
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: true
- id: 4.2.13
text: "Ensure that the Kubelet only makes use of Strong Cryptographic Ciphers (Not Scored)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/cat $kubeletconf"
tests:
test_items:
- flag: --tls-cipher-suites
path: '{range .tlsCipherSuites[:]}{}{'',''}{end}'
set: true
compare:
op: valid_elements
value: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256
remediation: |
If using a Kubelet config file, edit the file to set TLSCipherSuites: to
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256
or to a subset of these values.
If using executable arguments, edit the kubelet service file
$kubeletsvc on each worker node and
set the --tls-cipher-suites parameter as follows, or to a subset of these values.
--tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
scored: false

239
cfg/cis-1.5/policies.yaml Normal file
View File

@ -0,0 +1,239 @@
---
controls:
version: 1.5
id: 5
text: "Kubernetes Policies"
type: "policies"
groups:
- id: 5.1
text: "RBAC and Service Accounts"
checks:
- id: 5.1.1
text: "Ensure that the cluster-admin role is only used where required (Not Scored)"
type: "manual"
remediation: |
Identify all clusterrolebindings to the cluster-admin role. Check if they are used and
if they need this role or if they could use a role with fewer privileges.
Where possible, first bind users to a lower privileged role and then remove the
clusterrolebinding to the cluster-admin role :
kubectl delete clusterrolebinding [name]
scored: false
- id: 5.1.2
text: "Minimize access to secrets (Not Scored)"
type: "manual"
remediation: |
Where possible, remove get, list and watch access to secret objects in the cluster.
scored: false
- id: 5.1.3
text: "Minimize wildcard use in Roles and ClusterRoles (Not Scored)"
type: "manual"
remediation: |
Where possible replace any use of wildcards in clusterroles and roles with specific
objects or actions.
scored: false
- id: 5.1.4
text: "Minimize access to create pods (Not Scored)"
type: "manual"
Remediation: |
Where possible, remove create access to pod objects in the cluster.
scored: false
- id: 5.1.5
text: "Ensure that default service accounts are not actively used. (Scored)"
type: "manual"
remediation: |
Create explicit service accounts wherever a Kubernetes workload requires specific access
to the Kubernetes API server.
Modify the configuration of each default service account to include this value
automountServiceAccountToken: false
scored: true
- id: 5.1.6
text: "Ensure that Service Account Tokens are only mounted where necessary (Not Scored)"
type: "manual"
remediation: |
Modify the definition of pods and service accounts which do not need to mount service
account tokens to disable it.
scored: false
- id: 5.2
text: "Pod Security Policies"
checks:
- id: 5.2.1
text: "Minimize the admission of privileged containers (Not Scored)"
type: "manual"
remediation: |
Create a PSP as described in the Kubernetes documentation, ensuring that
the .spec.privileged field is omitted or set to false.
scored: false
- id: 5.2.2
text: "Minimize the admission of containers wishing to share the host process ID namespace (Scored)"
type: "manual"
remediation: |
Create a PSP as described in the Kubernetes documentation, ensuring that the
.spec.hostPID field is omitted or set to false.
scored: true
- id: 5.2.3
text: "Minimize the admission of containers wishing to share the host IPC namespace (Scored)"
type: "manual"
remediation: |
Create a PSP as described in the Kubernetes documentation, ensuring that the
.spec.hostIPC field is omitted or set to false.
scored: true
- id: 5.2.4
text: "Minimize the admission of containers wishing to share the host network namespace (Scored)"
type: "manual"
remediation: |
Create a PSP as described in the Kubernetes documentation, ensuring that the
.spec.hostNetwork field is omitted or set to false.
scored: true
- id: 5.2.5
text: "Minimize the admission of containers with allowPrivilegeEscalation (Scored)"
type: "manual"
remediation: |
Create a PSP as described in the Kubernetes documentation, ensuring that the
.spec.allowPrivilegeEscalation field is omitted or set to false.
scored: true
- id: 5.2.6
text: "Minimize the admission of root containers (Not Scored)"
type: "manual"
remediation: |
Create a PSP as described in the Kubernetes documentation, ensuring that the
.spec.runAsUser.rule is set to either MustRunAsNonRoot or MustRunAs with the range of
UIDs not including 0.
scored: false
- id: 5.2.7
text: "Minimize the admission of containers with the NET_RAW capability (Not Scored)"
type: "manual"
remediation: |
Create a PSP as described in the Kubernetes documentation, ensuring that the
.spec.requiredDropCapabilities is set to include either NET_RAW or ALL.
scored: false
- id: 5.2.8
text: "Minimize the admission of containers with added capabilities (Not Scored)"
type: "manual"
remediation: |
Ensure that allowedCapabilities is not present in PSPs for the cluster unless
it is set to an empty array.
scored: false
- id: 5.2.9
text: "Minimize the admission of containers with capabilities assigned (Not Scored) "
type: "manual"
remediation: |
Review the use of capabilites in applications runnning on your cluster. Where a namespace
contains applicaions which do not require any Linux capabities to operate consider adding
a PSP which forbids the admission of containers which do not drop all capabilities.
scored: false
- id: 5.3
text: "Network Policies and CNI"
checks:
- id: 5.3.1
text: "Ensure that the CNI in use supports Network Policies (Not Scored)"
type: "manual"
remediation: |
If the CNI plugin in use does not support network policies, consideration should be given to
making use of a different plugin, or finding an alternate mechanism for restricting traffic
in the Kubernetes cluster.
scored: false
- id: 5.3.2
text: "Ensure that all Namespaces have Network Policies defined (Scored)"
type: "manual"
remediation: |
Follow the documentation and create NetworkPolicy objects as you need them.
scored: true
- id: 5.4
text: "Secrets Management"
checks:
- id: 5.4.1
text: "Prefer using secrets as files over secrets as environment variables (Not Scored)"
type: "manual"
remediation: |
if possible, rewrite application code to read secrets from mounted secret files, rather than
from environment variables.
scored: false
- id: 5.4.2
text: "Consider external secret storage (Not Scored)"
type: "manual"
remediation: |
Refer to the secrets management options offered by your cloud provider or a third-party
secrets management solution.
scored: false
- id: 5.5
text: "Extensible Admission Control"
checks:
- id: 5.5.1
text: "Configure Image Provenance using ImagePolicyWebhook admission controller (Not Scored)"
type: "manual"
remediation: |
Follow the Kubernetes documentation and setup image provenance.
scored: false
- id: 5.6
text: "General Policies"
checks:
- id: 5.6.1
text: "Create administrative boundaries between resources using namespaces (Not Scored)"
type: "manual"
remediation: |
Follow the documentation and create namespaces for objects in your deployment as you need
them.
scored: false
- id: 5.6.2
text: "Ensure that the seccomp profile is set to docker/default in your pod definitions (Not Scored)"
type: "manual"
remediation: |
Seccomp is an alpha feature currently. By default, all alpha features are disabled. So, you
would need to enable alpha features in the apiserver by passing "--feature-
gates=AllAlpha=true" argument.
Edit the /etc/kubernetes/apiserver file on the master node and set the KUBE_API_ARGS
parameter to "--feature-gates=AllAlpha=true"
KUBE_API_ARGS="--feature-gates=AllAlpha=true"
Based on your system, restart the kube-apiserver service. For example:
systemctl restart kube-apiserver.service
Use annotations to enable the docker/default seccomp profile in your pod definitions. An
example is as below:
apiVersion: v1
kind: Pod
metadata:
name: trustworthy-pod
annotations:
seccomp.security.alpha.kubernetes.io/pod: docker/default
spec:
containers:
- name: trustworthy-container
image: sotrustworthy:latest
scored: false
- id: 5.6.3
text: "Apply Security Context to Your Pods and Containers (Not Scored)"
type: "manual"
remediation: |
Follow the Kubernetes documentation and apply security contexts to your pods. For a
suggested list of security contexts, you may refer to the CIS Security Benchmark for Docker
Containers.
scored: false
- id: 5.6.4
text: "The default namespace should not be used (Scored)"
type: "manual"
remediation: |
Ensure that namespaces are created to allow for appropriate segregation of Kubernetes
resources and that all new resources are created in a specific namespace.
scored: true

25
cfg/config.yaml
View File

@ -142,11 +142,34 @@ node:
defaultconf: /etc/kubernetes/addons/kube-proxy-daemonset.yaml
defaultkubeconfig: "/etc/kubernetes/proxy.conf"
etcd:
components:
- etcd
etcd:
bins:
- "etcd"
confs:
- /etc/kubernetes/manifests/etcd.yaml
- /etc/kubernetes/manifests/etcd.manifest
- /etc/etcd/etcd.conf
- /var/snap/etcd/common/etcd.conf.yml
defaultconf: /etc/kubernetes/manifests/etcd.yaml
controlplane:
components: []
policies:
components: []
version_mapping:
"1.11": "cis-1.3"
"1.12": "cis-1.3"
"1.13": "cis-1.4"
"1.14": "cis-1.4"
"1.15": "cis-1.4"
"1.15": "cis-1.5"
"1.16": "cis-1.5"
"1.17": "cis-1.5"
"ocp-3.10": "rh-0.7"
"ocp-3.11": "rh-0.7"

7
check/check.go
View File

@ -49,6 +49,13 @@ const (
// FEDERATED a federated deployment.
FEDERATED NodeType = "federated"
// ETCD an etcd node
ETCD NodeType = "etcd"
// CONTROLPLANE a control plane node
CONTROLPLANE NodeType = "controlplane"
// POLICIES a node to run policies from
POLICIES NodeType = "policies"
// MANUAL Check Type
MANUAL string = "manual"
)

59
cmd/common.go
View File

@ -219,6 +219,12 @@ func loadConfig(nodetype check.NodeType) string {
file = masterFile
case check.NODE:
file = nodeFile
case check.CONTROLPLANE:
file = controlplaneFile
case check.ETCD:
file = etcdFile
case check.POLICIES:
file = policiesFile
}
benchmarkVersion, err := getBenchmarkVersion(kubeVersion, benchmarkVersion, viper.GetViper())
@ -313,22 +319,32 @@ func getBenchmarkVersion(kubeVersion, benchmarkVersion string, v *viper.Viper) (
// isMaster verify if master components are running on the node.
func isMaster() bool {
glog.V(2).Info("Checking if the current node is running master components")
masterConf := viper.Sub(string(check.MASTER))
if masterConf == nil {
glog.V(2).Info("No master components found to be running")
return isThisNodeRunning(check.MASTER)
}
// isEtcd verify if etcd components are running on the node.
func isEtcd() bool {
return isThisNodeRunning(check.ETCD)
}
func isThisNodeRunning(nodeType check.NodeType) bool {
glog.V(2).Infof("Checking if the current node is running %s components", nodeType)
etcdConf := viper.Sub(string(nodeType))
if etcdConf == nil {
glog.V(2).Infof("No %s components found to be running", nodeType)
return false
}
components, err := getBinariesFunc(masterConf, check.MASTER)
components, err := getBinariesFunc(etcdConf, nodeType)
if err != nil {
glog.V(2).Info(err)
return false
}
if len(components) == 0 {
glog.V(2).Info("No master binaries specified")
glog.V(2).Infof("No %s binaries specified", nodeType)
return false
}
return true
}
@ -360,3 +376,34 @@ func PrintOutput(output string, outputFile string) {
}
}
}
var benchmarkVersionToTargetsMap = map[string][]string{
"cis-1.3": []string{string(check.MASTER), string(check.NODE)},
"cis-1.4": []string{string(check.MASTER), string(check.NODE)},
"cis-1.5": []string{string(check.MASTER), string(check.NODE), string(check.CONTROLPLANE), string(check.ETCD), string(check.POLICIES)},
}
// validTargets helps determine if the targets
// are legitimate for the benchmarkVersion.
func validTargets(benchmarkVersion string, targets []string) bool {
providedTargets, found := benchmarkVersionToTargetsMap[benchmarkVersion]
if !found {
return false
}
for _, pt := range targets {
f := false
for _, t := range providedTargets {
if pt == strings.ToLower(t) {
f = true
break
}
}
if !f {
return false
}
}
return true
}

48
cmd/common_test.go
View File

@ -192,7 +192,10 @@ func TestMapToCISVersion(t *testing.T) {
{kubeVersion: "1.11", succeed: true, exp: "cis-1.3"},
{kubeVersion: "1.12", succeed: true, exp: "cis-1.3"},
{kubeVersion: "1.13", succeed: true, exp: "cis-1.4"},
{kubeVersion: "1.16", succeed: true, exp: "cis-1.4"},
{kubeVersion: "1.14", succeed: true, exp: "cis-1.4"},
{kubeVersion: "1.15", succeed: true, exp: "cis-1.5"},
{kubeVersion: "1.16", succeed: true, exp: "cis-1.5"},
{kubeVersion: "1.17", succeed: true, exp: "cis-1.5"},
{kubeVersion: "ocp-3.10", succeed: true, exp: "rh-0.7"},
{kubeVersion: "ocp-3.11", succeed: true, exp: "rh-0.7"},
{kubeVersion: "unknown", succeed: false, exp: "", expErr: "unable to find a matching Benchmark Version match for kubernetes version: unknown"},
@ -340,6 +343,49 @@ func TestGetBenchmarkVersion(t *testing.T) {
}
}
func TestValidTargets(t *testing.T) {
cases := []struct {
name string
benchmark string
targets []string
expected bool
}{
{
name: "cis-1.3 no etcd",
benchmark: "cis-1.3",
targets: []string{"master", "etcd"},
expected: false,
},
{
name: "cis-1.4 valid",
benchmark: "cis-1.4",
targets: []string{"master", "node"},
expected: true,
},
{
name: "cis-1.5 no dummy",
benchmark: "cis-1.5",
targets: []string{"master", "node", "controlplane", "etcd", "dummy"},
expected: false,
},
{
name: "cis-1.5 valid",
benchmark: "cis-1.5",
targets: []string{"master", "node", "controlplane", "etcd", "policies"},
expected: true,
},
}
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
ret := validTargets(c.benchmark, c.targets)
if ret != c.expected {
t.Fatalf("Expected %t, got %t", c.expected, ret)
}
})
}
}
func loadConfigForTest() (*viper.Viper, error) {
viperWithData := viper.New()
viperWithData.SetConfigFile(filepath.Join("..", cfgDir, "config.yaml"))

37
cmd/root.go
View File

@ -44,6 +44,9 @@ var (
pgSQL bool
masterFile = "master.yaml"
nodeFile = "node.yaml"
etcdFile = "etcd.yaml"
controlplaneFile = "controlplane.yaml"
policiesFile = "policies.yaml"
noResults bool
noSummary bool
noRemediations bool
@ -59,14 +62,40 @@ var RootCmd = &cobra.Command{
Short: "Run CIS Benchmarks checks against a Kubernetes deployment",
Long: `This tool runs the CIS Kubernetes Benchmark (https://www.cisecurity.org/benchmark/kubernetes/)`,
Run: func(cmd *cobra.Command, args []string) {
benchmarkVersion, err := getBenchmarkVersion(kubeVersion, benchmarkVersion, viper.GetViper())
if err != nil {
exitWithError(err)
}
if isMaster() {
glog.V(1).Info("== Running master checks ==\n")
filename := loadConfig(check.MASTER)
runChecks(check.MASTER, filename)
runChecks(check.MASTER, loadConfig(check.MASTER))
// Control Plane is only valid for CIS 1.5 and later,
// this a gatekeeper for previous versions
if validTargets(benchmarkVersion, []string{string(check.CONTROLPLANE)}) {
glog.V(1).Info("== Running control plane checks ==\n")
runChecks(check.CONTROLPLANE, loadConfig(check.CONTROLPLANE))
}
}
// Etcd is only valid for CIS 1.5 and later,
// this a gatekeeper for previous versions.
if isEtcd() && validTargets(benchmarkVersion, []string{string(check.ETCD)}) {
glog.V(1).Info("== Running etcd checks ==\n")
runChecks(check.ETCD, loadConfig(check.ETCD))
}
glog.V(1).Info("== Running node checks ==\n")
filename := loadConfig(check.NODE)
runChecks(check.NODE, filename)
runChecks(check.NODE, loadConfig(check.NODE))
// Policies is only valid for CIS 1.5 and later,
// this a gatekeeper for previous versions.
if validTargets(benchmarkVersion, []string{string(check.POLICIES)}) {
glog.V(1).Info("== Running policies checks ==\n")
runChecks(check.POLICIES, loadConfig(check.POLICIES))
}
},
}

37
cmd/run.go
View File

@ -14,10 +14,10 @@ import (
func init() {
RootCmd.AddCommand(runCmd)
runCmd.Flags().StringSliceP("sections", "s", []string{},
`Specify sections of the benchmark to run. These names need to match the filenames in the cfg/<version> directory.
For example, to run the tests specified in master.yaml and etcd.yaml, specify --sections=master,etcd
If no sections are specified, run tests from all files in the cfg/<version> directory.
runCmd.Flags().StringSliceP("targets", "s", []string{},
`Specify targets of the benchmark to run. These names need to match the filenames in the cfg/<version> directory.
For example, to run the tests specified in master.yaml and etcd.yaml, specify --targets=master,etcd
If no targets are specified, run tests from all files in the cfg/<version> directory.
`)
}
@ -27,7 +27,7 @@ var runCmd = &cobra.Command{
Short: "Run tests",
Long: `Run tests. If no arguments are specified, runs tests from all files`,
Run: func(cmd *cobra.Command, args []string) {
sections, err := cmd.Flags().GetStringSlice("sections")
targets, err := cmd.Flags().GetStringSlice("targets")
if err != nil {
exitWithError(err)
}
@ -37,20 +37,24 @@ var runCmd = &cobra.Command{
exitWithError(err)
}
glog.V(2).Infof("Checking targets %v for %v", targets, benchmarkVersion)
if len(targets) > 0 && !validTargets(benchmarkVersion, targets) {
exitWithError(fmt.Errorf(fmt.Sprintf(`The specified --targets "%s" does not apply to the CIS Benchmark %s \n Valid targets %v`, strings.Join(targets, ","), benchmarkVersion, benchmarkVersionToTargetsMap[benchmarkVersion])))
}
// Merge version-specific config if any.
path := filepath.Join(cfgDir, benchmarkVersion)
mergeConfig(path)
err = run(sections, benchmarkVersion)
err = run(targets, benchmarkVersion)
if err != nil {
fmt.Printf("Error in run: %v\n", err)
}
},
}
func run(sections []string, benchmarkVersion string) (err error) {
yamlFiles, err := getTestYamlFiles(sections, benchmarkVersion)
func run(targets []string, benchmarkVersion string) (err error) {
yamlFiles, err := getTestYamlFiles(targets, benchmarkVersion)
if err != nil {
return err
}
@ -66,12 +70,11 @@ func run(sections []string, benchmarkVersion string) (err error) {
return nil
}
func getTestYamlFiles(sections []string, benchmarkVersion string) (yamlFiles []string, err error) {
// Check that the specified sections have corresponding YAML files in the config directory
func getTestYamlFiles(targets []string, benchmarkVersion string) (yamlFiles []string, err error) {
// Check that the specified targets have corresponding YAML files in the config directory
configFileDirectory := filepath.Join(cfgDir, benchmarkVersion)
for _, section := range sections {
filename := section + ".yaml"
for _, target := range targets {
filename := translate(target) + ".yaml"
file := filepath.Join(configFileDirectory, filename)
if _, err := os.Stat(file); err != nil {
return nil, fmt.Errorf("file %s not found for version %s", filename, benchmarkVersion)
@ -79,7 +82,7 @@ func getTestYamlFiles(sections []string, benchmarkVersion string) (yamlFiles []s
yamlFiles = append(yamlFiles, file)
}
// If no sections were specified, we will run tests from all the files in the directory
// If no targets were specified, we will run tests from all the files in the directory
if len(yamlFiles) == 0 {
yamlFiles, err = getYamlFilesFromDir(configFileDirectory)
if err != nil {
@ -89,3 +92,7 @@ func getTestYamlFiles(sections []string, benchmarkVersion string) (yamlFiles []s
return yamlFiles, err
}
func translate(target string) string {
return strings.Replace(strings.ToLower(target), "worker", "node", -1)
}

56
cmd/run_test.go
View File

@ -10,34 +10,34 @@ import (
func TestGetTestYamlFiles(t *testing.T) {
cases := []struct {
name string
sections []string
targets []string
benchmark string
succeed bool
expCount int
}{
{
name: "Specify two sections",
sections: []string{"one", "two"},
name: "Specify two targets",
targets: []string{"one", "two"},
benchmark: "benchmark",
succeed: true,
expCount: 2,
},
{
name: "Specify a section that doesn't exist",
sections: []string{"one", "missing"},
name: "Specify a target that doesn't exist",
targets: []string{"one", "missing"},
benchmark: "benchmark",
succeed: false,
},
{
name: "No sections specified - should return everything except config.yaml",
sections: []string{},
name: "No targets specified - should return everything except config.yaml",
targets: []string{},
benchmark: "benchmark",
succeed: true,
expCount: 3,
},
{
name: "Specify benchmark that doesn't exist",
sections: []string{"one"},
targets: []string{"one"},
benchmark: "missing",
succeed: false,
},
@ -67,7 +67,7 @@ func TestGetTestYamlFiles(t *testing.T) {
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
yamlFiles, err := getTestYamlFiles(c.sections, c.benchmark)
yamlFiles, err := getTestYamlFiles(c.targets, c.benchmark)
if err != nil && c.succeed {
t.Fatalf("Error %v", err)
}
@ -82,3 +82,41 @@ func TestGetTestYamlFiles(t *testing.T) {
})
}
}
func TestTranslate(t *testing.T) {
cases := []struct {
name string
original string
expected string
}{
{
name: "keep",
original: "controlplane",
expected: "controlplane",
},
{
name: "translate",
original: "worker",
expected: "node",
},
{
name: "translateLower",
original: "Worker",
expected: "node",
},
{
name: "Lower",
original: "ETCD",
expected: "etcd",
},
}
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
ret := translate(c.original)
if ret != c.expected {
t.Fatalf("Expected %q, got %q", c.expected, ret)
}
})
}
}

12
cmd/util.go
View File

@ -391,12 +391,18 @@ The following %q programs have been searched, but none of them have been found:
These program names are provided in the config.yaml, section '%s.%s.bins'
`
componentRoleName := "master node"
componentType := "master"
var componentRoleName, componentType string
switch nodetype {
if nodetype == check.NODE {
case check.NODE:
componentRoleName = "worker node"
componentType = "node"
case check.ETCD:
componentRoleName = "etcd node"
componentType = "etcd"
default:
componentRoleName = "master node"
componentType = "master"
}
binList := ""

6
integration/integration_test.go
View File

@ -40,19 +40,19 @@ func TestRunWithKind(t *testing.T) {
}{
{
TestName: "job",
KindCfg: "./testdata/add-tls-kind.yaml",
KindCfg: "./testdata/add-tls-kind-k8s114.yaml",
KubebenchYAML: "../job.yaml",
ExpectedFile: "./testdata/job.data",
},
{
TestName: "job-node",
KindCfg: "./testdata/add-tls-kind.yaml",
KindCfg: "./testdata/add-tls-kind-k8s114.yaml",
KubebenchYAML: "../job-node.yaml",
ExpectedFile: "./testdata/job-node.data",
},
{
TestName: "job-master",
KindCfg: "./testdata/add-tls-kind.yaml",
KindCfg: "./testdata/add-tls-kind-k8s114.yaml",
KubebenchYAML: "../job-master.yaml",
ExpectedFile: "./testdata/job-master.data",
},

8
integration/testdata/add-tls-kind.yaml → integration/testdata/add-tls-kind-k8s114.yaml vendored
View File

@ -10,4 +10,10 @@ kubeadmConfigPatchesJson6902:
patch: |
- op: add
path: /tlsCipherSuites
value: ["TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256","TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"]
value: ["TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256","TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"]
nodes:
# the control plane node config
- role: control-plane
image: "kindest/node:v1.14.6"