[MSB] Make consul run as non-root

Start whole consul container as non-root and ensure that both
dumb-init and consul are able to start and run as non-root.

Issue-ID: REQ-362
Change-Id: If5a737953122cc6cd22b8d43ac603b40f4b22727
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
(cherry picked from commit bc6a6674f749efc1693c4b6bd58a27f8c37a0ae0)

4 files changed, 149 insertions, 0 deletions

diff --git a/kubernetes/msb/charts/msb-consul/resources/docker-entrypoint.sh b/kubernetes/msb/charts/msb-consul/resources/docker-entrypoint.sh
new file mode 100755
index 0000000000..0cd46167e4
--- /dev/null
+++ b/kubernetes/msb/charts/msb-consul/resources/docker-entrypoint.sh
@@ -0,0 +1,100 @@
+#!/usr/bin/dumb-init /bin/sh
+set -e
+set -x
+
+# Note above that we run dumb-init as PID 1 in order to reap zombie processes
+# as well as forward signals to all processes in its session. Normally, sh
+# wouldn't do either of these functions so we'd leak zombies as well as do
+# unclean termination of all our sub-processes.
+# As of docker 1.13, using docker run --init achieves the same outcome.
+
+# You can set CONSUL_BIND_INTERFACE to the name of the interface you'd like to
+# bind to and this will look up the IP and pass the proper -bind= option along
+# to Consul.
+CONSUL_BIND=
+if [ -n "$CONSUL_BIND_INTERFACE" ]; then
+  CONSUL_BIND_ADDRESS=$(ip -o -4 addr list $CONSUL_BIND_INTERFACE | head -n1 | awk '{print $4}' | cut -d/ -f1)
+  if [ -z "$CONSUL_BIND_ADDRESS" ]; then
+    echo "Could not find IP for interface '$CONSUL_BIND_INTERFACE', exiting"
+    exit 1
+  fi
+
+  CONSUL_BIND="-bind=$CONSUL_BIND_ADDRESS"
+  echo "==> Found address '$CONSUL_BIND_ADDRESS' for interface '$CONSUL_BIND_INTERFACE', setting bind option..."
+fi
+
+# You can set CONSUL_CLIENT_INTERFACE to the name of the interface you'd like to
+# bind client intefaces (HTTP, DNS, and RPC) to and this will look up the IP and
+# pass the proper -client= option along to Consul.
+CONSUL_CLIENT=
+if [ -n "$CONSUL_CLIENT_INTERFACE" ]; then
+  CONSUL_CLIENT_ADDRESS=$(ip -o -4 addr list $CONSUL_CLIENT_INTERFACE | head -n1 | awk '{print $4}' | cut -d/ -f1)
+  if [ -z "$CONSUL_CLIENT_ADDRESS" ]; then
+    echo "Could not find IP for interface '$CONSUL_CLIENT_INTERFACE', exiting"
+    exit 1
+  fi
+
+  CONSUL_CLIENT="-client=$CONSUL_CLIENT_ADDRESS"
+  echo "==> Found address '$CONSUL_CLIENT_ADDRESS' for interface '$CONSUL_CLIENT_INTERFACE', setting client option..."
+fi
+
+# CONSUL_DATA_DIR is exposed as a volume for possible persistent storage. The
+# CONSUL_CONFIG_DIR isn't exposed as a volume but you can compose additional
+# config files in there if you use this image as a base, or use CONSUL_LOCAL_CONFIG
+# below.
+CONSUL_DATA_DIR=/consul/data
+CONSUL_CONFIG_DIR=/consul/config
+
+# You can also set the CONSUL_LOCAL_CONFIG environemnt variable to pass some
+# Consul configuration JSON without having to bind any volumes.
+if [ -n "$CONSUL_LOCAL_CONFIG" ]; then
+	echo "$CONSUL_LOCAL_CONFIG" > "$CONSUL_CONFIG_DIR/local.json"
+fi
+
+# If the user is trying to run Consul directly with some arguments, then
+# pass them to Consul.
+if [ "${1:0:1}" = '-' ]; then
+    set -- consul "$@"
+fi
+
+# Look for Consul subcommands.
+if [ "$1" = 'agent' ]; then
+    shift
+    set -- consul agent \
+        -data-dir="$CONSUL_DATA_DIR" \
+        -config-dir="$CONSUL_CONFIG_DIR" \
+        $CONSUL_BIND \
+        $CONSUL_CLIENT \
+        "$@"
+elif [ "$1" = 'version' ]; then
+    # This needs a special case because there's no help output.
+    set -- consul "$@"
+elif consul --help "$1" 2>&1 | grep -q "consul $1"; then
+    # We can't use the return code to check for the existence of a subcommand, so
+    # we have to use grep to look for a pattern in the help output.
+    set -- consul "$@"
+fi
+
+# If we are running Consul, make sure it executes as the proper user.
+if [ "$1" = 'consul' ]; then
+    # If the data or config dirs are bind mounted then chown them.
+    # Note: This checks for root ownership as that's the most common case.
+    if [ "$(stat -c %u /consul/data)" != "$(id -u consul)" ]; then
+        chown consul:consul /consul/data
+    fi
+    if [ "$(stat -c %u /consul/config)" != "$(id -u consul)" ]; then
+        chown consul:consul /consul/config
+    fi
+
+    # If requested, set the capability to bind to privileged ports before
+    # we drop to the non-root user. Note that this doesn't work with all
+    # storage drivers (it won't work with AUFS).
+    if [ ! -z ${CONSUL_ALLOW_PRIVILEGED_PORTS+x} ]; then
+        setcap "cap_net_bind_service=+ep" /bin/consul
+    fi
+
+# Instead of using this we run our pod as a non-root user.
+#    set -- su-exec consul:consul "$@"
+fi
+
+exec "$@"
diff --git a/kubernetes/msb/charts/msb-consul/templates/configmap.yaml b/kubernetes/msb/charts/msb-consul/templates/configmap.yaml
new file mode 100644
index 0000000000..32adcaec5f
--- /dev/null
+++ b/kubernetes/msb/charts/msb-consul/templates/configmap.yaml
@@ -0,0 +1,27 @@
+{{/*
+# Copyright © 2020 Samsung Electronics
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+*/}}
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ include "common.fullname" . }}-entrypoint
+  namespace: {{ include "common.namespace" . }}
+  labels:
+    app: {{ include "common.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ include "common.release" . }}
+    heritage: {{ .Release.Service }}
+data:
+{{ tpl (.Files.Glob "resources/*").AsConfig . | indent 2 }}
diff --git a/kubernetes/msb/charts/msb-consul/templates/deployment.yaml b/kubernetes/msb/charts/msb-consul/templates/deployment.yaml
index 2639a8ed36..c7472cca72 100644
--- a/kubernetes/msb/charts/msb-consul/templates/deployment.yaml
+++ b/kubernetes/msb/charts/msb-consul/templates/deployment.yaml
@@ -41,6 +41,16 @@ spec:
         - name: {{ include "common.name" . }}
           image: "{{ .Values.global.dockerHubRepository | default .Values.dockerHubRepository }}/{{ .Values.image }}"
           imagePullPolicy: {{ .Values.global.pullPolicy | default .Values.pullPolicy }}
+          securityContext:
+            runAsUser: {{ .Values.securityContext.runAsUser }}
+            runAsGroup: {{ .Values.securityContext.runAsGroup }}
+          command:
+            - docker-entrypoint.sh
+          args:
+            - "agent"
+            - "-dev"
+            - "-client"
+            - "0.0.0.0"
           ports:
           - containerPort: {{ .Values.service.internalPort }}
           # disable liveness probe when breakpoints set in debugger
@@ -62,6 +72,9 @@ spec:
           - mountPath: /etc/localtime
             name: localtime
             readOnly: true
+          - mountPath: /usr/local/bin/docker-entrypoint.sh
+            name: entrypoint
+            subPath: docker-entrypoint.sh
           resources:
 {{ include "common.resources" . | indent 12 }}
         {{- if .Values.nodeSelector }}
@@ -76,5 +89,9 @@ spec:
         - name: localtime
           hostPath:
             path: /etc/localtime
+        - name: entrypoint
+          configMap:
+            name: {{ include "common.fullname" . }}-entrypoint
+            defaultMode: 0777
       imagePullSecrets:
       - name: "{{ include "common.namespace" . }}-docker-registry-key"
diff --git a/kubernetes/msb/charts/msb-consul/values.yaml b/kubernetes/msb/charts/msb-consul/values.yaml
index d11649754f..49c51d1e39 100644
--- a/kubernetes/msb/charts/msb-consul/values.yaml
+++ b/kubernetes/msb/charts/msb-consul/values.yaml
@@ -83,3 +83,8 @@ resources:
       cpu: 20m
       memory: 100Mi
   unlimited: {}
+
+securityContext:
+  fsGroup: 1000
+  runAsUser: 100
+  runAsGroup: 1000