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nixpkgs/nixos/tests/kubernetes/certs.nix

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Nix

{
pkgs ? import <nixpkgs> {},
externalDomain ? "myawesomecluster.cluster.yourdomain.net",
serviceClusterIp ? "10.0.0.1",
kubelets,
...
}:
let
runWithCFSSL = name: cmd:
let secrets = pkgs.runCommand "${name}-cfss.json" {
buildInputs = [ pkgs.cfssl pkgs.jq ];
outputs = [ "out" "cert" "key" "csr" ];
}
''
(
echo "${cmd}"
cfssl ${cmd} > tmp
cat tmp | jq -r .key > $key
cat tmp | jq -r .cert > $cert
cat tmp | jq -r .csr > $csr
touch $out
) 2>&1 | fold -w 80 -s
'';
in {
key = secrets.key;
cert = secrets.cert;
csr = secrets.csr;
};
writeCFSSL = content:
pkgs.runCommand content.name {
buildInputs = [ pkgs.cfssl pkgs.jq ];
} ''
mkdir -p $out
cd $out
json=${pkgs.lib.escapeShellArg (builtins.toJSON content)}
# for a given $field in the $json, treat the associated value as a
# file path and substitute the contents thereof into the $json
# object.
expandFileField() {
local field=$1
if jq -e --arg field "$field" 'has($field)'; then
local path="$(echo "$json" | jq -r ".$field")"
json="$(echo "$json" | jq --arg val "$(cat "$path")" ".$field = \$val")"
fi
}
expandFileField key
expandFileField ca
expandFileField cert
echo "$json" | cfssljson -bare ${content.name}
'';
noCSR = content: pkgs.lib.filterAttrs (n: v: n != "csr") content;
noKey = content: pkgs.lib.filterAttrs (n: v: n != "key") content;
writeFile = content:
if pkgs.lib.isDerivation content
then content
else pkgs.writeText "content" (builtins.toJSON content);
createServingCertKey = { ca, cn, hosts? [], size ? 2048, name ? cn }:
noCSR (
(runWithCFSSL name "gencert -ca=${writeFile ca.cert} -ca-key=${writeFile ca.key} -profile=server -config=${writeFile ca.config} ${writeFile {
CN = cn;
hosts = hosts;
key = { algo = "rsa"; inherit size; };
}}") // { inherit name; }
);
createClientCertKey = { ca, cn, groups ? [], size ? 2048, name ? cn }:
noCSR (
(runWithCFSSL name "gencert -ca=${writeFile ca.cert} -ca-key=${writeFile ca.key} -profile=client -config=${writeFile ca.config} ${writeFile {
CN = cn;
names = map (group: {O = group;}) groups;
hosts = [""];
key = { algo = "rsa"; inherit size; };
}}") // { inherit name; }
);
createSigningCertKey = { C ? "xx", ST ? "x", L ? "x", O ? "x", OU ? "x", CN ? "ca", emailAddress ? "x", expiry ? "43800h", size ? 2048, name ? CN }:
(noCSR (runWithCFSSL CN "genkey -initca ${writeFile {
key = { algo = "rsa"; inherit size; };
names = [{ inherit C ST L O OU CN emailAddress; }];
}}")) // {
inherit name;
config.signing = {
default.expiry = expiry;
profiles = {
server = {
inherit expiry;
usages = [
"signing"
"key encipherment"
"server auth"
];
};
client = {
inherit expiry;
usages = [
"signing"
"key encipherment"
"client auth"
];
};
peer = {
inherit expiry;
usages = [
"signing"
"key encipherment"
"server auth"
"client auth"
];
};
};
};
};
ca = createSigningCertKey {};
kube-apiserver = createServingCertKey {
inherit ca;
cn = "kube-apiserver";
hosts = ["kubernetes.default" "kubernetes.default.svc" "localhost" "api.${externalDomain}" serviceClusterIp];
};
kubelet = createServingCertKey {
inherit ca;
cn = "kubelet";
hosts = ["*.${externalDomain}"];
};
service-accounts = createServingCertKey {
inherit ca;
cn = "kube-service-accounts";
};
etcd = createServingCertKey {
inherit ca;
cn = "etcd";
hosts = ["etcd.${externalDomain}"];
};
etcd-client = createClientCertKey {
inherit ca;
cn = "etcd-client";
};
kubelet-client = createClientCertKey {
inherit ca;
cn = "kubelet-client";
groups = ["system:masters"];
};
apiserver-client = {
kubelet = hostname: createClientCertKey {
inherit ca;
name = "apiserver-client-kubelet-${hostname}";
cn = "system:node:${hostname}.${externalDomain}";
groups = ["system:nodes"];
};
kube-proxy = createClientCertKey {
inherit ca;
name = "apiserver-client-kube-proxy";
cn = "system:kube-proxy";
groups = ["system:kube-proxy" "system:nodes"];
};
kube-controller-manager = createClientCertKey {
inherit ca;
name = "apiserver-client-kube-controller-manager";
cn = "system:kube-controller-manager";
groups = ["system:masters"];
};
kube-scheduler = createClientCertKey {
inherit ca;
name = "apiserver-client-kube-scheduler";
cn = "system:kube-scheduler";
groups = ["system:kube-scheduler"];
};
admin = createClientCertKey {
inherit ca;
cn = "admin";
groups = ["system:masters"];
};
};
in {
master = pkgs.buildEnv {
name = "master-keys";
paths = [
(writeCFSSL (noKey ca))
(writeCFSSL kube-apiserver)
(writeCFSSL kubelet-client)
(writeCFSSL apiserver-client.kube-controller-manager)
(writeCFSSL apiserver-client.kube-scheduler)
(writeCFSSL service-accounts)
(writeCFSSL etcd)
];
};
worker = pkgs.buildEnv {
name = "worker-keys";
paths = [
(writeCFSSL (noKey ca))
(writeCFSSL kubelet)
(writeCFSSL apiserver-client.kube-proxy)
(writeCFSSL etcd-client)
] ++ map (hostname: writeCFSSL (apiserver-client.kubelet hostname)) kubelets;
};
admin = writeCFSSL apiserver-client.admin;
}