PKI Automation

pki_scripts/ca-config.json

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+{
+    "signing": {
+        "default": {
+            "expiry": "8760h"
+        },
+        "profiles": {
+            "kubernetes": {
+                "usages": ["signing", "key encipherment", "server auth", "client auth"],
+                "expiry": "8760h"
+            }
+        }
+    }
+}

pki_scripts/cert_data.json

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+{
+    "CN": "${CN}",
+    "key": {
+        "algo": "$KEY_ALGO",
+        "size": $KEY_SIZE
+    },
+    "names": [{
+        "C": "${COUNTRY}",
+        "L": "${LOCALITY}",
+        "O": "${ORG}",
+        "OU": "${ORG_UNIT}",
+        "ST": "${STATE_PROV}"
+    }]
+}

pki_scripts/pki.sh

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+#!/bin/bash
+######################################################
+# Tutorial Author: Abel Perez Martinez
+# Tutorial: https://github.com/abelperezok/kubernetes-raspberry-pi-cluster-hat
+# Script Author: Bryan McWhirt
+# Description: 
+#   This is a bash script that automates the
+#   creation of the PKI. Make sure you understand
+#   what is being done or you will run into issues.
+#   I wrote this as it was tedious to do every time 
+#   I started over to experiment.
+# 
+# Usage:
+#   Fill in your information for:
+#       COUNTRY, STATE_PROV, LOCALITY, ORG, ORG_UNIT,
+#       KUBERNETES_PUBLIC_ADDRESS
+#   Verify you INTERNAL_IP_BASE matches the one here.
+#   Abel's documentation uses 172.19.181. but mine 
+#   was 172.19.180.
+#
+# Copy this file and ca-config.json to ~/ on the 
+#   orchistrator node.
+#
+# chmod 740 ~/pki.sh
+#
+# cd ~
+#
+# ./pki.sh
+######################################################
+declare -x COUNTRY=""
+declare -x STATE_PROV=""
+declare -x LOCALITY=""
+declare -x ORG=""
+declare -x ORG_UNIT=""
+declare -x KUBERNETES_PUBLIC_ADDRESS=
+declare -x INTERNAL_IP_BASE=172.19.180.
+declare -ax NODES=(1 2 3 4)
+declare -x KEY_ALGO="rsa"
+declare -x KEY_SIZE=2048
+declare -ax CSR_FILE=(ca admin p1 p2 p3 p4\
+ kube-controller-manager kube-proxy\
+ kube-scheduler kubernetes service-account)
+declare -ax CSR_CN=(Kubernetes admin system:node:p1\
+ system:node:p2 system:node:p3 system:node:p4\
+ system:kube-controller-manager system:kube-proxy\
+ system:kube-scheduler kubernetes  service-accounts)
+
+declare -x KUBERNETES_HOSTNAMES=kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.svc.cluster.local
+
+# Make the pki directory and copy in the ca config.
+mkdir -p ~/pki
+cp ca-config.json ~/pki
+cp cert_data.json ~/pki
+cd ~/pki
+
+
+# gen_csr file cn
+# E.g. gen_csr admin-csr admin
+function gen_csr {
+    CN=${2} envsubst < ../cert_data.json > ${1}-csr.json
+}
+
+# Create the JSON config files.
+COUNT=0
+for cn in ${CSR_CN[@]}; do
+    gen_csr ${CSR_FILE[COUNT]} ${cn}
+    ((COUNT=COUNT+1))
+done
+
+
+# Generate the Certificate Authority.
+# The ca-config.json has no real variables so it is included.
+cfssl gencert -initca ca-csr.json | cfssljson -bare ca
+
+for cert in ${STD[@]}; do
+ cfssl gencert  -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes $cert-csr.json | cfssljson -bare $cert
+done
+
+# Generate node certificates.
+for node in ${NODES[*]}; do
+    INTERNAL_IP=${INTERNAL_IP_BASE}${node}
+    cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -hostname=p${node},${INTERNAL_IP} -profile=kubernetes p${node}-csr.json | cfssljson -bare p${node}
+done
+
+# Generate API certificate.
+cfssl gencert \
+  -ca=ca.pem \
+  -ca-key=ca-key.pem \
+  -config=ca-config.json \
+  -hostname=10.32.0.1,${INTERNAL_IP_BASE}254,rpi-k8s-master,rpi-k8s-master.local,${KUBERNETES_PUBLIC_ADDRESS},127.0.0.1,${KUBERNETES_HOSTNAMES} \
+  -profile=kubernetes \
+  kubernetes-csr.json | cfssljson -bare kubernetes