Merge pull request #3257 from georgejdli/feature-helm-tls-2
[helm-tls] add option to secure helm tiller with tls
This commit is contained in:
commit
baf1aba239
4 changed files with 212 additions and 0 deletions
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@ -10,6 +10,24 @@ helm_deployment_type: host
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# Do not download the local repository cache on helm init
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helm_skip_refresh: false
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# Secure Tiller installation with TLS
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tiller_enable_tls: false
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helm_config_dir: "{{ kube_config_dir }}/helm"
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helm_script_dir: "{{ bin_dir }}/helm-scripts"
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# Store tiller release information as Secret instead of a ConfigMap
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tiller_secure_release_info: false
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# Where private root key will be secured for TLS
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helm_tiller_cert_dir: "{{ helm_config_dir }}/ssl"
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tiller_tls_cert: "{{ helm_tiller_cert_dir }}/tiller.pem"
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tiller_tls_key: "{{ helm_tiller_cert_dir }}/tiller-key.pem"
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tiller_tls_ca_cert: "{{ helm_tiller_cert_dir }}/ca.pem"
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# Permission owner and group for helm client cert. Will be dependent on the helm_home_dir
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helm_cert_group: root
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helm_cert_owner: root
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# Set URL for stable repository
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# helm_stable_repo_url: "https://kubernetes-charts.storage.googleapis.com"
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76
roles/kubernetes-apps/helm/files/helm-make-ssl.sh
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76
roles/kubernetes-apps/helm/files/helm-make-ssl.sh
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@ -0,0 +1,76 @@
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#!/bin/bash
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set -o errexit
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set -o pipefail
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usage()
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{
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cat << EOF
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Create self signed certificates
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Usage : $(basename $0) -f <config> [-d <ssldir>]
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-h | --help : Show this message
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-e | --helm-home : Helm home directory
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-d | --ssldir : Directory where the certificates will be installed
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EOF
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}
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# Options parsing
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while (($#)); do
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case "$1" in
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-h | --help) usage; exit 0;;
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-e | --helm-home) HELM_HOME="${2}"; shift 2;;
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-d | --ssldir) SSLDIR="${2}"; shift 2;;
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*)
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usage
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echo "ERROR : Unknown option"
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exit 3
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;;
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esac
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done
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if [ -z ${SSLDIR} ]; then
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SSLDIR="/etc/kubernetes/helm/ssl"
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fi
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tmpdir=$(mktemp -d /tmp/helm_cacert.XXXXXX)
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trap 'rm -rf "${tmpdir}"' EXIT
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cd "${tmpdir}"
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mkdir -p "${SSLDIR}"
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# Root CA
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if [ -e "$SSLDIR/ca-key.pem" ]; then
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# Reuse existing CA
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cp $SSLDIR/{ca.pem,ca-key.pem} .
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else
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openssl genrsa -out ca-key.pem 4096 > /dev/null 2>&1
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openssl req -x509 -new -nodes -key ca-key.pem -days 36500 -out ca.pem -subj "/CN=tiller-ca" > /dev/null 2>&1
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fi
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gen_key_and_cert() {
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local name=$1
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local subject=$2
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openssl genrsa -out ${name}-key.pem 4096 > /dev/null 2>&1
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openssl req -new -key ${name}-key.pem -sha256 -out ${name}.csr -subj "${subject}" > /dev/null 2>&1
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openssl x509 -req -in ${name}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out ${name}.pem -days 36500 > /dev/null 2>&1
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}
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#Generate cert and key for Tiller if they don't exist
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if ! [ -e "$SSLDIR/tiller.pem" ]; then
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gen_key_and_cert "tiller" "/CN=tiller-server"
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fi
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#Generate cert and key for Helm client if they dont exist
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if ! [ -e "$SSLDIR/helm.pem" ]; then
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gen_key_and_cert "helm" "/CN=helm-client"
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fi
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# Secure certs to first master
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mv *.pem ${SSLDIR}/
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# Install Helm client certs to first master
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# Copy using Helm default names for convenience
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cp ${SSLDIR}/ca.pem ${HELM_HOME}/ca.pem
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cp ${SSLDIR}/helm.pem ${HELM_HOME}/cert.pem
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cp ${SSLDIR}/helm-key.pem ${HELM_HOME}/key.pem
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107
roles/kubernetes-apps/helm/tasks/gen_helm_tiller_certs.yml
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107
roles/kubernetes-apps/helm/tasks/gen_helm_tiller_certs.yml
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@ -0,0 +1,107 @@
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---
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- name: "Gen_helm_tiller_certs | Create helm config directory (on {{groups['kube-master'][0]}})"
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run_once: yes
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delegate_to: "{{groups['kube-master'][0]}}"
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file:
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path: "{{ helm_config_dir }}"
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state: directory
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owner: kube
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- name: "Gen_helm_tiller_certs | Create helm script directory (on {{groups['kube-master'][0]}})"
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run_once: yes
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delegate_to: "{{groups['kube-master'][0]}}"
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file:
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path: "{{ helm_script_dir }}"
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state: directory
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owner: kube
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- name: Gen_helm_tiller_certs | Copy certs generation script
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run_once: yes
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delegate_to: "{{groups['kube-master'][0]}}"
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copy:
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src: "helm-make-ssl.sh"
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dest: "{{ helm_script_dir }}/helm-make-ssl.sh"
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mode: 0700
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- name: "Check_helm_certs | check if helm client certs have already been generated on first master (on {{groups['kube-master'][0]}})"
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find:
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paths: "{{ helm_home_dir }}"
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patterns: "*.pem"
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get_checksum: true
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delegate_to: "{{groups['kube-master'][0]}}"
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register: helmcert_master
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run_once: true
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- name: Gen_helm_tiller_certs | run cert generation script
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run_once: yes
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delegate_to: "{{groups['kube-master'][0]}}"
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command: "{{ helm_script_dir }}/helm-make-ssl.sh -e {{ helm_home_dir }} -d {{ helm_tiller_cert_dir }}"
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- set_fact:
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helm_client_certs: ['ca.pem', 'cert.pem', 'key.pem']
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- name: "Check_helm_client_certs | check if a cert already exists on master node"
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find:
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paths: "{{ helm_home_dir }}"
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patterns: "*.pem"
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get_checksum: true
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register: helmcert_node
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when: inventory_hostname != groups['kube-master'][0]
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- name: "Check_helm_client_certs | Set 'sync_helm_certs' to true on masters"
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set_fact:
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sync_helm_certs: true
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when: inventory_hostname != groups['kube-master'][0] and
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(not item in helmcert_node.files | map(attribute='path') | map("basename") | list or
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helmcert_node.files | selectattr("path", "equalto", "{{ helm_home_dir }}/{{ item }}") | map(attribute="checksum")|first|default('') != helmcert_master.files | selectattr("path", "equalto", "{{ helm_home_dir }}/{{ item }}") | map(attribute="checksum")|first|default(''))
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with_items:
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- "{{ helm_client_certs }}"
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- name: Gen_helm_tiller_certs | Gather helm client certs
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shell: "tar cfz - -C {{ helm_home_dir }} -T /dev/stdin <<< {{ helm_client_certs|join(' ') }} | base64 --wrap=0"
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args:
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executable: /bin/bash
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no_log: true
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register: helm_client_cert_data
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check_mode: no
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delegate_to: "{{groups['kube-master'][0]}}"
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when: sync_helm_certs|default(false) and inventory_hostname != groups['kube-master'][0]
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- name: Gen_helm_tiller_certs | Use tempfile for unpacking certs on masters
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tempfile:
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state: file
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path: /tmp
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prefix: helmcertsXXXXX
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suffix: tar.gz
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register: helm_cert_tempfile
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when: sync_helm_certs|default(false) and inventory_hostname != groups['kube-master'][0]
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- name: Gen_helm_tiller_certs | Write helm client certs to tempfile
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copy:
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content: "{{helm_client_cert_data.stdout}}"
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dest: "{{helm_cert_tempfile.path}}"
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owner: root
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mode: "0600"
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when: sync_helm_certs|default(false) and inventory_hostname != groups['kube-master'][0]
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- name: Gen_helm_tiller_certs | Unpack helm certs on masters
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shell: "base64 -d < {{ helm_cert_tempfile.path }} | tar xz -C {{ helm_home_dir }}"
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no_log: true
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changed_when: false
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check_mode: no
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when: sync_helm_certs|default(false) and inventory_hostname != groups['kube-master'][0]
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- name: Gen_helm_tiller_certs | Cleanup tempfile on masters
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file:
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path: "{{helm_cert_tempfile.path}}"
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state: absent
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when: sync_helm_certs|default(false) and inventory_hostname != groups['kube-master'][0]
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- name: Gen_certs | check certificate permissions
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file:
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path: "{{ helm_home_dir }}"
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group: "{{ helm_cert_group }}"
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state: directory
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owner: "{{ helm_cert_owner }}"
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mode: "u=rwX,g-rwx,o-rwx"
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recurse: yes
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@ -27,6 +27,11 @@
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with_items: "{{ manifests.results }}"
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when: dns_mode != 'none' and inventory_hostname == groups['kube-master'][0]
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# Generate necessary certs for securing Helm and Tiller connection with TLS
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- name: Helm | Set up TLS
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include_tasks: "gen_helm_tiller_certs.yml"
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when: tiller_enable_tls
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- name: Helm | Install/upgrade helm
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command: >
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{{ bin_dir }}/helm init --upgrade --tiller-image={{ tiller_image_repo }}:{{ tiller_image_tag }} --tiller-namespace={{ tiller_namespace }}
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@ -36,8 +41,11 @@
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{% if tiller_node_selectors is defined %} --node-selectors {{ tiller_node_selectors }}{% endif %}
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{% if tiller_override is defined %} --override {{ tiller_override }}{% endif %}
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{% if tiller_max_history is defined %} --history-max={{ tiller_max_history }}{% endif %}
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{% if tiller_enable_tls %} --tiller-tls --tiller-tls-verify --tiller-tls-cert={{ tiller_tls_cert }} --tiller-tls-key={{ tiller_tls_key }} --tls-ca-cert={{ tiller_tls_ca_cert }} {% endif %}
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{% if tiller_secure_release_info %} --override 'spec.template.spec.containers[0].command'='{/tiller,--storage=secret}' {% endif %}
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register: install_helm
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changed_when: false
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environment: "{{proxy_env}}"
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# FIXME: https://github.com/helm/helm/issues/4063
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- name: Helm | Force apply tiller overrides if necessary
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@ -49,9 +57,12 @@
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{% if tiller_node_selectors is defined %} --node-selectors {{ tiller_node_selectors }}{% endif %}
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{% if tiller_override is defined %} --override {{ tiller_override }}{% endif %}
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{% if tiller_max_history is defined %} --history-max={{ tiller_max_history }}{% endif %}
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{% if tiller_enable_tls %} --tiller-tls --tiller-tls-verify --tiller-tls-cert={{ tiller_tls_cert }} --tiller-tls-key={{ tiller_tls_key }} --tls-ca-cert={{ tiller_tls_ca_cert }} {% endif %}
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{% if tiller_secure_release_info %} --override 'spec.template.spec.containers[0].command'='{/tiller,--storage=secret}' {% endif %}
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| kubectl apply -f -
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changed_when: false
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when: tiller_override is defined
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environment: "{{proxy_env}}"
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- name: Helm | Set up bash completion
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shell: "umask 022 && {{ bin_dir }}/helm completion bash >/etc/bash_completion.d/helm.sh"
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