Switch to generating certs with openssl.

2025-12-14 18:24:24 -05:00
parent 771ec2e38a
commit 1606d569d0
23 changed files with 476 additions and 324 deletions
--- a/nix/kubernetes/keys/package/k8s-ca/files/ca-csr.json
+++ b/nix/kubernetes/keys/package/k8s-ca/files/ca-csr.json
@@ -1,16 +0,0 @@
-{
-  "CN": "Kubernetes",
-  "key": {
-    "algo": "rsa",
-    "size": 2048
-  },
-  "names": [
-    {
-      "C": "US",
-      "L": "Portland",
-      "O": "Kubernetes",
-      "OU": "CA",
-      "ST": "Oregon"
-    }
-  ]
-}
--- a/nix/kubernetes/keys/package/k8s-ca/files/ca.conf
+++ b/nix/kubernetes/keys/package/k8s-ca/files/ca.conf
@@ -0,0 +1,291 @@
+[req]
+distinguished_name = req_distinguished_name
+prompt             = no
+x509_extensions    = ca_x509_extensions
+
+[ca_x509_extensions]
+basicConstraints = CA:TRUE
+keyUsage         = cRLSign, keyCertSign
+
+[req_distinguished_name]
+C   = US
+ST  = Washington
+L   = Seattle
+CN  = CA
+
+[admin]
+distinguished_name = admin_distinguished_name
+prompt             = no
+req_extensions     = default_req_extensions
+
+[admin_distinguished_name]
+CN = admin
+O  = system:masters
+
+# Service Accounts
+#
+# The Kubernetes Controller Manager leverages a key pair to generate
+# and sign service account tokens as described in the
+# [managing service accounts](https://kubernetes.io/docs/admin/service-accounts-admin/)
+# documentation.
+
+[service-accounts]
+distinguished_name = service-accounts_distinguished_name
+prompt             = no
+req_extensions     = default_req_extensions
+
+[service-accounts_distinguished_name]
+CN = service-accounts
+
+# Worker Nodes
+#
+# Kubernetes uses a [special-purpose authorization mode](https://kubernetes.io/docs/admin/authorization/node/)
+# called Node Authorizer, that specifically authorizes API requests made
+# by [Kubelets](https://kubernetes.io/docs/concepts/overview/components/#kubelet).
+# In order to be authorized by the Node Authorizer, Kubelets must use a credential
+# that identifies them as being in the `system:nodes` group, with a username
+# of `system:node:<nodeName>`.
+
+[controller0]
+distinguished_name = controller0_distinguished_name
+prompt             = no
+req_extensions     = controller0_req_extensions
+
+[controller0_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth, serverAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client
+nsComment            = "controller0 Certificate"
+subjectAltName       = DNS:controller0, IP:127.0.0.1
+subjectKeyIdentifier = hash
+
+[controller0_distinguished_name]
+CN = system:node:controller0
+O  = system:nodes
+C  = US
+ST = Washington
+L  = Seattle
+
+[controller1]
+distinguished_name = controller1_distinguished_name
+prompt             = no
+req_extensions     = controller1_req_extensions
+
+[controller1_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth, serverAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client
+nsComment            = "controller1 Certificate"
+subjectAltName       = DNS:controller1, IP:127.0.0.1
+subjectKeyIdentifier = hash
+
+[controller1_distinguished_name]
+CN = system:node:controller1
+O  = system:nodes
+C  = US
+ST = Washington
+L  = Seattle
+
+[controller2]
+distinguished_name = controller2_distinguished_name
+prompt             = no
+req_extensions     = controller2_req_extensions
+
+[controller2_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth, serverAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client
+nsComment            = "controller2 Certificate"
+subjectAltName       = DNS:controller2, IP:127.0.0.1
+subjectKeyIdentifier = hash
+
+[controller2_distinguished_name]
+CN = system:node:controller2
+O  = system:nodes
+C  = US
+ST = Washington
+L  = Seattle
+
+[worker0]
+distinguished_name = worker0_distinguished_name
+prompt             = no
+req_extensions     = worker0_req_extensions
+
+[worker0_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth, serverAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client
+nsComment            = "worker0 Certificate"
+subjectAltName       = DNS:worker0, IP:127.0.0.1
+subjectKeyIdentifier = hash
+
+[worker0_distinguished_name]
+CN = system:node:worker0
+O  = system:nodes
+C  = US
+ST = Washington
+L  = Seattle
+
+[worker1]
+distinguished_name = worker1_distinguished_name
+prompt             = no
+req_extensions     = worker1_req_extensions
+
+[worker1_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth, serverAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client
+nsComment            = "worker1 Certificate"
+subjectAltName       = DNS:worker1, IP:127.0.0.1
+subjectKeyIdentifier = hash
+
+[worker1_distinguished_name]
+CN = system:node:worker1
+O  = system:nodes
+C  = US
+ST = Washington
+L  = Seattle
+
+[worker2]
+distinguished_name = worker2_distinguished_name
+prompt             = no
+req_extensions     = worker2_req_extensions
+
+[worker2_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth, serverAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client
+nsComment            = "worker2 Certificate"
+subjectAltName       = DNS:worker2, IP:127.0.0.1
+subjectKeyIdentifier = hash
+
+[worker2_distinguished_name]
+CN = system:node:worker2
+O  = system:nodes
+C  = US
+ST = Washington
+L  = Seattle
+
+
+
+# Kube Proxy Section
+[kube-proxy]
+distinguished_name = kube-proxy_distinguished_name
+prompt             = no
+req_extensions     = kube-proxy_req_extensions
+
+[kube-proxy_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth, serverAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client
+nsComment            = "Kube Proxy Certificate"
+subjectAltName       = DNS:kube-proxy, IP:127.0.0.1
+subjectKeyIdentifier = hash
+
+[kube-proxy_distinguished_name]
+CN = system:kube-proxy
+O  = system:node-proxier
+C  = US
+ST = Washington
+L  = Seattle
+
+
+# Controller Manager
+[kube-controller-manager]
+distinguished_name = kube-controller-manager_distinguished_name
+prompt             = no
+req_extensions     = kube-controller-manager_req_extensions
+
+[kube-controller-manager_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth, serverAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client
+nsComment            = "Kube Controller Manager Certificate"
+subjectAltName       = DNS:kube-controller-manager, IP:127.0.0.1
+subjectKeyIdentifier = hash
+
+[kube-controller-manager_distinguished_name]
+CN = system:kube-controller-manager
+O  = system:kube-controller-manager
+C  = US
+ST = Washington
+L  = Seattle
+
+
+# Scheduler
+[kube-scheduler]
+distinguished_name = kube-scheduler_distinguished_name
+prompt             = no
+req_extensions     = kube-scheduler_req_extensions
+
+[kube-scheduler_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth, serverAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client
+nsComment            = "Kube Scheduler Certificate"
+subjectAltName       = DNS:kube-scheduler, IP:127.0.0.1
+subjectKeyIdentifier = hash
+
+[kube-scheduler_distinguished_name]
+CN = system:kube-scheduler
+O  = system:system:kube-scheduler
+C  = US
+ST = Washington
+L  = Seattle
+
+
+# API Server
+#
+# The Kubernetes API server is automatically assigned the `kubernetes`
+# internal dns name, which will be linked to the first IP address (`10.32.0.1`)
+# from the address range (`10.32.0.0/24`) reserved for internal cluster
+# services.
+
+[kube-api-server]
+distinguished_name = kube-api-server_distinguished_name
+prompt             = no
+req_extensions     = kube-api-server_req_extensions
+
+[kube-api-server_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth, serverAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client, server
+nsComment            = "Kube API Server Certificate"
+subjectAltName       = @kube-api-server_alt_names
+subjectKeyIdentifier = hash
+
+[kube-api-server_alt_names]
+IP.0  = 127.0.0.1
+IP.1  = 10.32.0.1
+DNS.0 = kubernetes
+DNS.1 = kubernetes.default
+DNS.2 = kubernetes.default.svc
+DNS.3 = kubernetes.default.svc.cluster
+DNS.4 = kubernetes.svc.cluster.local
+DNS.5 = server.kubernetes.local
+DNS.6 = api-server.kubernetes.local
+
+[kube-api-server_distinguished_name]
+CN = kubernetes
+C  = US
+ST = Washington
+L  = Seattle
+
+
+[default_req_extensions]
+basicConstraints     = CA:FALSE
+extendedKeyUsage     = clientAuth
+keyUsage             = critical, digitalSignature, keyEncipherment
+nsCertType           = client
+nsComment            = "Admin Client Certificate"
+subjectKeyIdentifier = hash
--- a/nix/kubernetes/keys/package/k8s-ca/package.nix
+++ b/nix/kubernetes/keys/package/k8s-ca/package.nix
@@ -9,13 +9,12 @@
 # distPhase
 {
  stdenv,
-  sqlite,
-  cfssl,
+  openssl,
  ...
 }:
 stdenv.mkDerivation (finalAttrs: {
  name = "k8s-ca";
-  nativeBuildInputs = [ cfssl ];
+  nativeBuildInputs = [ openssl ];
  buildInputs = [ ];

  unpackPhase = "true";
@@ -23,6 +22,11 @@ stdenv.mkDerivation (finalAttrs: {
  installPhase = ''
    mkdir -p "$out"
    cd "$out"
-    cfssl gencert -initca ${./files/ca-csr.json} | cfssljson -bare ca
+
+    openssl genrsa -out ca.key 4096
+    openssl req -x509 -new -sha512 -noenc \
+            -key ca.key -days 3653 \
+            -config ${./files/ca.conf} \
+            -out ca.crt
  '';
 })