SSL certificates for etcd cluster.

Added generation of SSL certificates for etcd cluster internal communication. Turned on on gci & trusty.
kubernetes · Nov 8, 2016 · 4425ed1 · 4425ed1
1 parent 4dbc532
commit 4425ed1
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Showing 8 changed files with 160 additions and 6 deletions.
diff --git a/cluster/common.sh b/cluster/common.sh
@@ -702,6 +702,10 @@ MANIFEST_URL_HEADER: $(yaml-quote ${MANIFEST_URL_HEADER:-})
 NUM_NODES: $(yaml-quote ${NUM_NODES})
 STORAGE_BACKEND: $(yaml-quote ${STORAGE_BACKEND:-etcd2})
 ENABLE_GARBAGE_COLLECTOR: $(yaml-quote ${ENABLE_GARBAGE_COLLECTOR:-})
+ETCD_CA_KEY: $(yaml-quote ${ETCD_CA_KEY_BASE64:-})
+ETCD_CA_CERT: $(yaml-quote ${ETCD_CA_CERT_BASE64:-})
+ETCD_PEER_KEY: $(yaml-quote ${ETCD_PEER_KEY_BASE64:-})
+ETCD_PEER_CERT: $(yaml-quote ${ETCD_PEER_CERT_BASE64:-})
 EOF
     # ETCD_IMAGE (if set) allows to use a custom etcd image.
     if [ -n "${ETCD_IMAGE:-}" ]; then

diff --git a/cluster/gce/configure-vm.sh b/cluster/gce/configure-vm.sh
@@ -458,6 +458,7 @@ num_nodes: $(echo "${NUM_NODES:-}" | sed -e "s/'/''/g")
 e2e_storage_test_environment: '$(echo "$E2E_STORAGE_TEST_ENVIRONMENT" | sed -e "s/'/''/g")'
 kube_uid: '$(echo "${KUBE_UID}" | sed -e "s/'/''/g")'
 initial_etcd_cluster: '$(echo "${INITIAL_ETCD_CLUSTER:-}" | sed -e "s/'/''/g")'
+etcd_over_ssl: 'false'
 hostname: $(hostname -s)
 EOF
     if [ -n "${STORAGE_BACKEND:-}" ]; then

diff --git a/cluster/gce/gci/configure-helper.sh b/cluster/gce/gci/configure-helper.sh
@@ -375,6 +375,15 @@ current-context: service-account-context
 EOF
 }
 
+function create-master-etcd-auth {
+  if [[ -n "${ETCD_CA_CERT:-}" && -n "${ETCD_PEER_KEY:-}" && -n "${ETCD_PEER_CERT:-}" ]]; then
+    local -r auth_dir="/etc/srv/kubernetes"
+    echo "${ETCD_CA_CERT}" | base64 --decode | gunzip > "${auth_dir}/etcd-ca.crt"
+    echo "${ETCD_PEER_KEY}" | base64 --decode > "${auth_dir}/etcd-peer.key"
+    echo "${ETCD_PEER_CERT}" | base64 --decode | gunzip > "${auth_dir}/etcd-peer.crt"
+  fi
+}
+
 function assemble-docker-flags {
   echo "Assemble docker command line flags"
   local docker_opts="-p /var/run/docker.pid --iptables=false --ip-masq=false"
@@ -604,14 +613,23 @@ function prepare-etcd-manifest {
   local host_name=$(hostname)
   local etcd_cluster=""
   local cluster_state="new"
+  local etcd_protocol="http"
+  local etcd_creds=""
+
+  if [[ -n "${ETCD_CA_KEY:-}" && -n "${ETCD_CA_CERT:-}" && -n "${ETCD_PEER_KEY:-}" && -n "${ETCD_PEER_CERT:-}" ]]; then
+    local etcd_creds=" --peer-trusted-ca-file /etc/srv/kubernetes/etcd-ca.crt --peer-cert-file /etc/srv/kubernetes/etcd-peer.crt --peer-key-file /etc/srv/kubernetes/etcd-peer.key -peer-client-cert-auth "
+    local etcd_protocol="https"
+  fi
+
   for host in $(echo "${INITIAL_ETCD_CLUSTER:-${host_name}}" | tr "," "\n"); do
-    etcd_host="etcd-${host}=http://${host}:$3"
+    etcd_host="etcd-${host}=${etcd_protocol}://${host}:$3"
     if [[ -n "${etcd_cluster}" ]]; then
       etcd_cluster+=","
       cluster_state="existing"
     fi
     etcd_cluster+="${etcd_host}"
   done
+
   local -r temp_file="/tmp/$5"
   cp "${KUBE_HOME}/kube-manifests/kubernetes/gci-trusty/etcd.manifest" "${temp_file}"
   remove-salt-config-comments "${temp_file}"
@@ -633,6 +651,8 @@ function prepare-etcd-manifest {
   else
     sed -i -e "s@{{ *pillar\.get('etcd_docker_tag', '\(.*\)') *}}@\1@g" "${temp_file}"
   fi
+  sed -i -e "s@{{ *etcd_protocol *}}@$etcd_protocol@g" "${temp_file}"
+  sed -i -e "s@{{ *etcd_creds *}}@$etcd_creds@g" "${temp_file}"
   if [[ -n "${ETCD_VERSION:-}" ]]; then
     sed -i -e "s@{{ *pillar\.get('etcd_version', '\(.*\)') *}}@${ETCD_VERSION}@g" "${temp_file}"
   else
@@ -1205,6 +1225,7 @@ if [[ "${KUBERNETES_MASTER:-}" == "true" ]]; then
   mount-master-pd
   create-master-auth
   create-master-kubelet-auth
+  create-master-etcd-auth
 else
   create-kubelet-kubeconfig
   create-kubeproxy-kubeconfig

diff --git a/cluster/gce/gci/master-helper.sh b/cluster/gce/gci/master-helper.sh
@@ -49,6 +49,16 @@ function replicate-master-instance() {
   # Substitute INITIAL_ETCD_CLUSTER to enable etcd clustering.
   kube_env="$(echo "${kube_env}" | grep -v "INITIAL_ETCD_CLUSTER")"
   kube_env="$(echo -e "${kube_env}\nINITIAL_ETCD_CLUSTER: '${existing_master_replicas},${REPLICA_NAME}'")"
+  ETCD_CA_KEY="$(echo "${kube_env}" | grep "ETCD_CA_KEY" |  sed "s/^.*: '//" | sed "s/'$//")"
+  ETCD_CA_CERT="$(echo "${kube_env}" | grep "ETCD_CA_CERT" |  sed "s/^.*: '//" | sed "s/'$//")"
+
+  create-etcd-certs "${ETCD_CA_CERT}" "${ETCD_CA_KEY}"
+
+  kube_env="$(echo "${kube_env}" | grep -v "ETCD_PEER_KEY")"
+  kube_env="$(echo -e "${kube_env}\nETCD_PEER_KEY: '${ETCD_PEER_KEY_BASE64}'")"
+  kube_env="$(echo "${kube_env}" | grep -v "ETCD_PEER_CERT")"
+  kube_env="$(echo -e "${kube_env}\nETCD_PEER_CERT: '${ETCD_PEER_CERT_BASE64}'")"
+
   echo "${kube_env}" > ${KUBE_TEMP}/master-kube-env.yaml
   get-metadata "${existing_master_zone}" "${existing_master_name}" cluster-name > "${KUBE_TEMP}/cluster-name.txt"
   get-metadata "${existing_master_zone}" "${existing_master_name}" gci-update-strategy > "${KUBE_TEMP}/gci-update.txt"
@@ -58,6 +68,7 @@ function replicate-master-instance() {
   create-master-instance-internal "${REPLICA_NAME}"
 }
 
+
 function create-master-instance-internal() {
   local -r master_name="${1}"
   local -r address_option="${2:-}"

diff --git a/cluster/gce/trusty/configure-helper.sh b/cluster/gce/trusty/configure-helper.sh
@@ -428,6 +428,15 @@ create_master_kubelet_auth() {
   fi
 }
 
+function create-master-etcd-auth {
+  if [[ -n "${ETCD_CA_CERT:-}" && -n "${ETCD_PEER_KEY:-}" && -n "${ETCD_PEER_CERT:-}" ]]; then
+    local -r auth_dir="/etc/srv/kubernetes"
+    echo "${ETCD_CA_CERT}" | base64 --decode | gunzip > "${auth_dir}/etcd-ca.crt"
+    echo "${ETCD_PEER_KEY}" | base64 --decode > "${auth_dir}/etcd-peer.key"
+    echo "${ETCD_PEER_CERT}" | base64 --decode | gunzip > "${auth_dir}/etcd-peer.crt"
+  fi
+}
+
 # Replaces the variables in the etcd manifest file with the real values, and then
 # copy the file to the manifest dir
 # $1: value for variable 'suffix'
@@ -439,14 +448,23 @@ prepare_etcd_manifest() {
   local host_name=$(hostname)
   local etcd_cluster=""
   local cluster_state="new"
+  local etcd_protocol="http"
+  local etcd_creds=""
+
+  if [[ -n "${ETCD_CA_KEY:-}" && -n "${ETCD_CA_CERT:-}" && -n "${ETCD_PEER_KEY:-}" && -n "${ETCD_PEER_CERT:-}" ]]; then
+    local etcd_creds=" --peer-trusted-ca-file /etc/srv/kubernetes/etcd-ca.crt --peer-cert-file /etc/srv/kubernetes/etcd-peer.crt --peer-key-file /etc/srv/kubernetes/etcd-peer.key -peer-client-cert-auth "
+    local etcd_protocol="https"
+  fi
+
   for host in $(echo "${INITIAL_ETCD_CLUSTER:-${host_name}}" | tr "," "\n"); do
-    etcd_host="etcd-${host}=http://${host}:$3"
+    etcd_host="etcd-${host}=${etcd_protocol}://${host}:$3"
     if [[ -n "${etcd_cluster}" ]]; then
       etcd_cluster+=","
       cluster_state="existing"
     fi
     etcd_cluster+="${etcd_host}"
   done
+
   etcd_temp_file="/tmp/$5"
   cp /home/kubernetes/kube-manifests/kubernetes/gci-trusty/etcd.manifest "${etcd_temp_file}"
   remove_salt_config_comments "${etcd_temp_file}"
@@ -468,6 +486,8 @@ prepare_etcd_manifest() {
   else
     sed -i -e "s@{{ *pillar\.get('etcd_docker_tag', '\(.*\)') *}}@\1@g" "${etcd_temp_file}"
   fi
+  sed -i -e "s@{{ *etcd_protocol *}}@$etcd_protocol@g" "${etcd_temp_file}"
+  sed -i -e "s@{{ *etcd_creds *}}@$etcd_creds@g" "${etcd_temp_file}"
   if [[ -n "${ETCD_VERSION:-}" ]]; then
     sed -i -e "s@{{ *pillar\.get('etcd_version', '\(.*\)') *}}@${ETCD_VERSION}@g" "${etcd_temp_file}"
   else

diff --git a/cluster/gce/trusty/master.yaml b/cluster/gce/trusty/master.yaml
@@ -65,6 +65,8 @@ script
 	create_master_auth
 	echo "Creating master instance kubelet auth file"
 	create_master_kubelet_auth
+	echo "Creating auth files for etcd"
+	create-master-etcd-auth
 	echo "Assemble kubelet command line"
 	# Kubelet command flags will be written in /etc/default/kubelet
 	assemble_kubelet_flags

diff --git a/cluster/gce/util.sh b/cluster/gce/util.sh
@@ -729,6 +729,86 @@ function get-master-root-disk-size() {
   fi
 }
 
+# Generates SSL certificates for etcd cluster. Uses cfssl program.
+#
+# Assumed vars:
+#   KUBE_TEMP: temporary directory
+#
+# Args:
+#  $1: CA certificate
+#  $2: CA key
+#
+# If CA cert/key is empty, the function will also generate certs for CA.
+#
+# Vars set:
+#   ETCD_CA_KEY_BASE64
+#   ETCD_CA_CERT_BASE64
+#   ETCD_PEER_KEY_BASE64
+#   ETCD_PEER_CERT_BASE64
+#
+function create-etcd-certs {
+  local ca_cert=${1:-}
+  local ca_key=${2:-}
+
+  mkdir -p "${KUBE_TEMP}/cfssl"
+  pushd "${KUBE_TEMP}/cfssl"
+
+  kernel=$(uname -s)
+  case "${kernel}" in
+    Linux)
+      curl -s -L -o cfssl https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
+      curl -s -L -o cfssljson https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
+      ;;
+    Darwin)
+      curl -s -L -o cfssl https://pkg.cfssl.org/R1.2/cfssl_darwin-amd64
+      curl -s -L -o cfssljson https://pkg.cfssl.org/R1.2/cfssljson_darwin-amd64
+      ;;
+    *)
+      echo "Unknown, unsupported platform: ${kernel}." >&2
+      echo "Supported platforms: Linux, Darwin." >&2
+      exit 2
+  esac
+
+  chmod +x cfssl
+  chmod +x cfssljson
+
+  cat >ca-config.json <<EOF
+{
+    "signing": {
+        "default": {
+            "expiry": "168h"
+        },
+        "profiles": {
+            "client-server": {
+                "expiry": "43800h",
+                "usages": [
+                    "signing",
+                    "key encipherment"
+                ]
+            }
+        }
+    }
+}
+EOF
+  if [[ ! -z "${ca_key}" && ! -z "${ca_cert}" ]]; then
+    echo "${ca_key}" | base64 --decode > ca-key.pem
+    echo "${ca_cert}" | base64 --decode | gunzip > ca.pem
+  else
+    ./cfssl print-defaults csr > ca-csr.json
+    ./cfssl gencert -initca ca-csr.json | ./cfssljson -bare ca -
+  fi
+
+  echo '{"CN":"'"${MASTER_NAME}"'","hosts":[""],"key":{"algo":"ecdsa","size":256}}' \
+      | ./cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=client-server -hostname="${MASTER_NAME}" - \
+      | ./cfssljson -bare etcd
+
+  ETCD_CA_KEY_BASE64=$(cat "ca-key.pem" | base64 | tr -d '\r\n')
+  ETCD_CA_CERT_BASE64=$(cat "ca.pem" | gzip | base64 | tr -d '\r\n')
+  ETCD_PEER_KEY_BASE64=$(cat "etcd-key.pem" | base64 | tr -d '\r\n')
+  ETCD_PEER_CERT_BASE64=$(cat "etcd.pem" | gzip | base64 | tr -d '\r\n')
+  popd
+}
+
 function create-master() {
   echo "Starting master and configuring firewalls"
   gcloud compute firewall-rules create "${MASTER_NAME}-https" \
@@ -784,6 +864,7 @@ function create-master() {
   KUBERNETES_MASTER_NAME="${MASTER_RESERVED_IP}"
 
   create-certs "${MASTER_RESERVED_IP}"
+  create-etcd-certs
 
   # Sets MASTER_ROOT_DISK_SIZE that is used by create-master-instance
   get-master-root-disk-size
@@ -809,7 +890,7 @@ function add-replica-to-etcd() {
     --project "${PROJECT}" \
     --zone "${EXISTING_MASTER_ZONE}" \
     --command \
-      "curl localhost:${client_port}/v2/members -XPOST -H \"Content-Type: application/json\" -d '{\"peerURLs\":[\"http://${REPLICA_NAME}:${internal_port}\"]}'"
+      "curl localhost:${client_port}/v2/members -XPOST -H \"Content-Type: application/json\" -d '{\"peerURLs\":[\"https://${REPLICA_NAME}:${internal_port}\"]}'"
   return $?
 }
 

diff --git a/cluster/saltbase/salt/etcd/etcd.manifest b/cluster/saltbase/salt/etcd/etcd.manifest
@@ -1,3 +1,9 @@
+{% set etcd_protocol = 'http' -%}
+{% set etcd_creds = '' -%}
+{% if pillar.get('etcd_over_ssl', '').lower() == 'true' -%}
+  {% set etcd_protocol = 'https' -%}
+  {% set etcd_creds = '--peer-trusted-ca-file /etc/srv/kubernetes/etcd-ca.crt --peer-cert-file /etc/srv/kubernetes/etcd-peer.crt --peer-key-file /etc/srv/kubernetes/etcd-peer.key -peer-client-cert-auth' -%}
+{% endif -%}
 {% set cluster_state = 'new' -%}
 {% set hostname = pillar.get('hostname', '') -%}
 {% set etcd_cluster_array = (pillar.get('initial_etcd_cluster') or hostname).split(',') -%}
@@ -9,7 +15,7 @@
     {% set cluster_state = 'existing' -%}
     {% set etcd_cluster = etcd_cluster ~ ',' -%}
   {% endif -%}
-  {% set etcd_cluster = etcd_cluster ~ 'etcd-' ~ host ~ '=http://' ~ host ~ ':' ~ server_port -%}
+  {% set etcd_cluster = etcd_cluster ~ 'etcd-' ~ host ~ '=' ~ etcd_protocol ~'://' ~ host ~ ':' ~ server_port -%}
   {% do vars.update({'etcd_cluster': etcd_cluster, 'cluster_state': cluster_state}) -%}
 {% endfor -%}
 {% set etcd_cluster = vars.etcd_cluster -%}
@@ -41,7 +47,7 @@
     "command": [
               "/bin/sh",
               "-c",
-              "if [ -e /usr/local/bin/migrate-if-needed.sh ]; then /usr/local/bin/migrate-if-needed.sh 1>>/var/log/etcd{{ suffix }}.log 2>&1; fi; /usr/local/bin/etcd --name etcd-{{ hostname }} --listen-peer-urls http://{{ hostname }}:{{ server_port }} --initial-advertise-peer-urls http://{{ hostname }}:{{ server_port }} --advertise-client-urls http://127.0.0.1:{{ port }} --listen-client-urls http://127.0.0.1:{{ port }} {{ quota_bytes }} --data-dir /var/etcd/data{{ suffix }} --initial-cluster-state {{ cluster_state }} --initial-cluster {{ etcd_cluster }} 1>>/var/log/etcd{{ suffix }}.log 2>&1"
+              "if [ -e /usr/local/bin/migrate-if-needed.sh ]; then /usr/local/bin/migrate-if-needed.sh 1>>/var/log/etcd{{ suffix }}.log 2>&1; fi; /usr/local/bin/etcd --name etcd-{{ hostname }} --listen-peer-urls {{ etcd_protocol }}://{{ hostname }}:{{ server_port }} --initial-advertise-peer-urls {{ etcd_protocol }}://{{ hostname }}:{{ server_port }} --advertise-client-urls http://127.0.0.1:{{ port }} --listen-client-urls http://127.0.0.1:{{ port }} {{ quota_bytes }} --data-dir /var/etcd/data{{ suffix }} --initial-cluster-state {{ cluster_state }} --initial-cluster {{ etcd_cluster }} {{ etcd_creds }} 1>>/var/log/etcd{{ suffix }}.log 2>&1"
             ],
     "env": [
       { "name": "TARGET_STORAGE",
@@ -81,8 +87,12 @@
       { "name": "varlogetcd",
         "mountPath": "/var/log/etcd{{ suffix }}.log",
         "readOnly": false
+      },
+      { "name": "etc",
+        "mountPath": "/etc/srv/kubernetes",
+        "readOnly": false
       }
-        ]
+    ]
     }
 ],
 "volumes":[
@@ -93,6 +103,10 @@
   { "name": "varlogetcd",
     "hostPath": {
         "path": "/var/log/etcd{{ suffix }}.log"}
+  },
+  { "name": "etc",
+    "hostPath": {
+        "path": "/etc/srv/kubernetes"}
   }
 ]
 }}