From eb018c7aeb8445db36ed18835803c61f730945cd Mon Sep 17 00:00:00 2001 From: helenyao Date: Thu, 10 Nov 2016 21:08:02 -0500 Subject: Add script to enable Docker Remote API by updating Docker Daemon configuration JIRA: FUNCTEST-520 This script will be used once the docker slicing decide is made. Currently, the script has been tested on Ubuntu 14.04 and 16.04 and CentOS 7.2. A document about how to enable TLS is included when taking security into account. Change-Id: I4e5e58ed68d75528bf8497aba118f9dbb51dddad Signed-off-by: helenyao --- docker/docker_remote_api/docs/TLS-intro.rst | 107 ++++++++++++++++++++++++++ docker/docker_remote_api/enable_remote_api.sh | 51 ++++++++++++ 2 files changed, 158 insertions(+) create mode 100644 docker/docker_remote_api/docs/TLS-intro.rst create mode 100644 docker/docker_remote_api/enable_remote_api.sh (limited to 'docker') diff --git a/docker/docker_remote_api/docs/TLS-intro.rst b/docker/docker_remote_api/docs/TLS-intro.rst new file mode 100644 index 000000000..934f99a8b --- /dev/null +++ b/docker/docker_remote_api/docs/TLS-intro.rst @@ -0,0 +1,107 @@ +Encrypt the docker remote API via TLS for Ubuntu and CentOS + +[Introduction] +The Docker daemon can listen to Docker Remote API requests via three types of +Socket: unix, tcp and fd. By default, a unix domain socket (or IPC socket) is +created at /var/run/docker.sock, requiring either root permission, or docker +group membership. + +Port 2375 is conventionally used for un-encrypted communition with Docker daemon +remotely, where docker server can be accessed by any docker client via tcp socket +in local area network. You can listen to port 2375 on all network interfaces with +-H tcp://0.0.0.0:2375, where 0.0.0.0 means any available IP address on host, and +tcp://0.0.0.0:2375 indicates that port 2375 is listened on any IP of daemon host. +If we want to make docker server open on the Internet via TCP port, and only trusted +clients have the right to access the docker server in a safe manner, port 2376 for +encrypted communication with the daemon should be listened. It can be achieved to +create certificate and distribute it to the trusted clients. + +Through creating self-signed certificate, and using --tlsverify command when running +Docker daemon, Docker daemon opens the TLS authentication. Thus only the clients +with related private key files can have access to the Docker daemon's server. As +long as the key files for encryption are secure between docker server and client, +the Docker daemon can keep secure. +In summary, +Firstly we should create docker server certificate and related key files, which +are distributed to the trusted clients. +Then the clients with related key files can access docker server. + +[Steps] +1.0. Create a CA, server and client keys with OpenSSL. + OpenSSL is used to generate certificate, and can be installed as follows. + apt-get install openssl openssl-devel + +1.1 First generate CA private and public keys. + openssl genrsa -aes256 -out ca-key.pem 4096 + openssl req -new -x509 -days 365 -key ca-key.pem -sha256 -out ca.pem + + You are about to be asked to enter information that will be incorporated + into your certificate request, where the instance of $HOST should be replaced + with the DNS name of your Docker daemon's host, here the DNS name of my Docker + daemon is ly. + Common Name (e.g. server FQDN or YOUR name) []:$HOST + +1.2 Now we have a CA (ca-key.pem and ca.pem), you can create a server key and +certificate signing request. + openssl genrsa -out server-key.pem 4096 + openssl req -subj "/CN=$HOST" -sha256 -new -key server-key.pem -out server.csr + +1.3 Sign the public key with our CA. + TLS connections can be made via IP address as well as DNS name, they need to be + specified when creating the certificate. + + echo subjectAltName = IP:172.16.10.121,IP:127.0.0.1 > extfile.cnf + openssl x509 -req -days 365 -sha256 -in server.csr -CA ca.pem -CAkey ca-key.pem \ + -CAcreateserial -out server-cert.pem -extfile extfile.cnf + +1.4 For client authentication, create a client key and certificate signing request. + openssl genrsa -out key.pem 4096 + openssl req -subj '/CN=client' -new -key key.pem -out client.csr + +1.5 To make the key suitable for client authentication, create an extensions config file. + echo extendedKeyUsage = clientAuth > extfile.cnf + +1.6 Sign the public key and after generating cert.pem and server-cert.pem, two certificate + signing requests can be removed. + openssl x509 -req -days 365 -sha256 -in client.csr -CA ca.pem -CAkey ca-key.pem \ + -CAcreateserial -out cert.pem -extfile extfile.cnf + +1.7 In order to protect your keys from accidental damage, you may change file modes to + be only readable. + chmod -v 0400 ca-key.pem key.pem server-key.pem + chmod -v 0444 ca.pem server-cert.pem cert.pem + +1.8 Build docker server + dockerd --tlsverify --tlscacert=ca.pem --tlscert=server-cert.pem --tlskey=server-key.pem \ + -H=0.0.0.0:2376 + Then, it can be seen from the command 'netstat -ntlp' that port 2376 has been listened + and the Docker daemon only accept connections from clients providing a certificate + trusted by our CA. + +1.9 Distribute the keys to the client + scp /etc/docker/ca.pem wwl@172.16.10.121:/etc/docker + scp /etc/docker/cert.pem wwl@172.16.10.121:/etc/docker + scp /etc/docker/key.pem wwl@172.16.10.121:/etc/docker + Where, wwl and 172.16.10.121 is the username and IP of the client respectively. + And the password of the client is needed when you distribute the keys to the client. + +1.10 To access Docker daemon from the client via keys. + docker --tlsverify --tlscacert=ca.pem --tlscert=cert.pem --tlskey=key.pem \ + -H=$HOST:2376 version + + Then we can operate docker in the Docker daemon from the client vis keys, for example: + 1) create container from the client + docker --tlsverify --tlscacert=ca.pem --tlscert=cert.pem --tlskey=key.pem -H=ly:2376 run -d \ + -it --name w1 grafana/grafana + 2) list containers from the client + docker --tlsverify --tlscacert=ca.pem --tlscert=cert.pem --tlskey=key.pem -H=ly:2376 pa -a + 3) stop/start containers from the client + docker --tlsverify --tlscacert=ca.pem --tlscert=cert.pem --tlskey=key.pem -H=ly:2376 stop w1 + docker --tlsverify --tlscacert=ca.pem --tlscert=cert.pem --tlskey=key.pem -H=ly:2376 start w1 + + + + + + + diff --git a/docker/docker_remote_api/enable_remote_api.sh b/docker/docker_remote_api/enable_remote_api.sh new file mode 100644 index 000000000..6867eeddf --- /dev/null +++ b/docker/docker_remote_api/enable_remote_api.sh @@ -0,0 +1,51 @@ +#!/bin/bash +# SPDX-license-identifier: Apache-2.0 + +# ****************************** +# Script to update the docker host configuration +# to enable Docker Remote API +# ****************************** + +if [ -f /etc/lsb-release ]; then + #tested on ubuntu 14.04 and 16.04 + if grep -q "#DOCKER_OPTS=" "/etc/default/docker"; then + cp /etc/default/docker /etc/default/docker.bak + sed -i 's/^#DOCKER_OPTS.*$/DOCKER_OPTS=\"-H unix:\/\/\/var\/run\/docker.sock -H tcp:\/\/0.0.0.0:2375\"/g' /etc/default/docker + else + echo DOCKER_OPTS=\"-H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375\" >> /etc/default/docker + fi + service docker restart + #docker start $(docker ps -aq) +elif [ -f /etc/system-release ]; then + #tested on centos 7.2 + if grep -q "ExecStart=\/usr\/bin\/docker-current daemon" "/lib/systemd/system/docker.service"; then + cp /lib/systemd/system/docker.service /lib/systemd/system/docker.service.bak + sed -i 's/^ExecStart=.*$/ExecStart=\/usr\/bin\/docker daemon -H tcp:\/\/0.0.0.0:2375 -H unix:\/\/\/var\/run\/docker.sock \\/g' /lib/systemd/system/docker.service + systemctl daemon-reload + systemctl restart docker + else + echo "to be implemented" + fi +else + echo "OS is not supported" +fi + +# Issue Note for Ubuntu +# 1. If the configuration of the file /etc/default/docker does not take effect after restarting docker service, +# you may try to modify /lib/systemd/system/docker.service +# commands: +# cp /lib/systemd/system/docker.service /lib/systemd/system/docker.service.bak +# sed -i '/^ExecStart/i\EnvironmentFile=-/etc/default/docker' /lib/systemd/system/docker.service +# sed -i '/ExecStart=\/usr\/bin\/dockerd/{;s/$/ \$DOCKER_OPTS/}' /lib/systemd/system/docker.service +# systemctl daemon-reload +# service docker restart +# 2. Systemd is a system and session manager for Linux, where systemctl is one tool for systemd to view and control systemd. +# If the file /lib/systemd/system/docker.service is modified, systemd has to be reloaded to scan new or changed units. +# 1) systemd and related packages are available on the PPA. To use the PPA, first add it to your software sources list as follows. +# add-apt-repository ppa:pitti/systemd +# apt-get update +# 2) system can be installed from the PPS as follows. +# apt-get install systemd libpam-systemd systemd-ui + + + -- cgit 1.2.3-korg