How to install CloudFlare CFSSL on Linux. Apple System

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CFSSL is CloudFlare’s open source PKI/TLS tool for signing, verifying and bundling TLS certificates on Linux, macOS and Windows computers. By choosing the correct certificate chain, CFSSL solves the balance between performance, security, and compatibility. In this guide, we will study how to install CFSSL on Linux and macOS systems.

CFSSL includes:

  • A set of software packages for building custom TLS PKI tools
  • The cfssl program, which is a canonical command-line utility that uses the CFSSL software package.
  • The multirootca program, which is a certificate authority server that can use multiple signing keys.
  • The mkbundle program is used to build a certificate pool bundle.
  • The cfssljson program, which takes JSON output from the cfssl and multirootca programs and writes the certificate, key, CSR, and bundle to disk.

Install CloudFlare CFSSL on Linux | Apple System

There are two standard installation methods available for Linux and macOS. One is to download a binary package compiled by a developer for you. Another option is to use Go to extract from the source code and compile it yourself.

Install from source

For the build installation method, you need Golang, you can use the following command to install.

--- Linux ---
wget -q -O - https://raw.githubusercontent.com/canha/golang-tools-install-script/master/goinstall.sh | bash

--- macOS ---
curl https://raw.githubusercontent.com/canha/golang-tools-install-script/master/goinstall.sh | bash

Install git:

--- CentOS / Fedora ---
$ sudo yum -y install git gcc

--- Ubuntu / Debian ---
$ sudo apt update
$ sudo apt install git

After installing Go, you can build and install all utilities (including cfssl, cfssljson, mkbundle, etc.).

source ~/.bashrc
go get -u github.com/cloudflare/cfssl/cmd/...

The binary package will be available in your home directory, and if the directory is in PATH, it can be called directly from the terminal.

$ ls ~/go/bin/
cfssl  cfssl-bundle  cfssl-certinfo  cfssljson  cfssl-newkey  cfssl-scan  mkbundle  multirootca

You can also copy the binary package to a directory in PATH.

sudo cp ~/go/bin/* /usr/local/bin

Binary installation method

If you like the binary installation method, each tool needs to be installed independently of the other tools. We have introduced the installation of some programs that come with cfssl, but you can also install other programs as needed.

Install the cfssl program

Install on Linux:

To install on a Linux machine, you should have the wget command line tool installed.

VERSION=$(curl --silent "https://api.github.com/repos/cloudflare/cfssl/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/1/')
VNUMBER=${VERSION#"v"}
wget https://github.com/cloudflare/cfssl/releases/download/${VERSION}/cfssl_${VNUMBER}_linux_amd64 -O cfssl
chmod +x cfssl
sudo mv cfssl /usr/local/bin

Install on macOS:

VERSION=$(curl --silent "https://api.github.com/repos/cloudflare/cfssl/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/1/')
VNUMBER=${VERSION#"v"}
wget https://github.com/cloudflare/cfssl/releases/download/${VERSION}/cfssl_${VNUMBER}_darwin_amd64 -O cfssl
chmod +x cfssl
sudo mv cfssl /usr/local/bin

Verify the installation by checking the version number:

$ cfssl version
Version: 1.4.1
Runtime: go1.12.12

Install the cfssljson program

Install on Linux:

VERSION=$(curl --silent "https://api.github.com/repos/cloudflare/cfssl/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/1/')
VNUMBER=${VERSION#"v"}
wget https://github.com/cloudflare/cfssl/releases/download/${VERSION}/cfssljson_${VNUMBER}_linux_amd64 -O cfssljson
chmod +x cfssljson
sudo mv cfssljson /usr/local/bin
cfssljson -version

Install on macOS:

VERSION=$(curl --silent "https://api.github.com/repos/cloudflare/cfssl/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/1/')
VNUMBER=${VERSION#"v"}
wget https://github.com/cloudflare/cfssl/releases/download/${VERSION}/cfssljson_${VNUMBER}_darwin_amd64 -O cfssljson
chmod +x cfssljson
sudo mv cfssljson /usr/local/bin
cfssljson -version

Install mkbundle

This is the program used to build the certificate pool bundle.

Install on Linux:

VERSION=$(curl --silent "https://api.github.com/repos/cloudflare/cfssl/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/1/')
VNUMBER=${VERSION#"v"}
wget https://github.com/cloudflare/cfssl/releases/download/${VERSION}/mkbundle_${VNUMBER}_linux_amd64 -O mkbundle
chmod +x mkbundle
sudo mv mkbundle /usr/local/bin

Install on macOS:

VERSION=$(curl --silent "https://api.github.com/repos/cloudflare/cfssl/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/1/')
VNUMBER=${VERSION#"v"}
wget https://github.com/cloudflare/cfssl/releases/download/${VERSION}/mkbundle_${VNUMBER}_darwin_amd64 -O mkbundle
chmod +x mkbundle
sudo mv mkbundle /usr/local/bin

Install multirootca

Install on Linux:

VERSION=$(curl --silent "https://api.github.com/repos/cloudflare/cfssl/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/1/')
VNUMBER=${VERSION#"v"}
wget https://github.com/cloudflare/cfssl/releases/download/${VERSION}/multirootca_${VNUMBER}_linux_amd64 -O multirootca
chmod +x multirootca
sudo mv multirootca /usr/local/bin

You can Project github page.

See our next article, How to use CloudFlare CFSSL to build a dedicated PKI/TLS CA for certificate management

Further reading:

Install Metasploit framework on CentOS

Use Cisco AnyConnect from a Linux terminal to connect to a VPN server

How to install SSL certificate on IIS web server

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