An online certificate authority and related tools for secure automated certificate management, so you can use TLS everywhere.
This repository is for step-ca
, a certificate authority that exposes an API for automated certificate management. It also contains a golang SDK for interacting with step-ca
programatically. However, you'll probably want to use the step
command-line tool to operate step-ca
and get certificates, instead of using this low-level SDK directly.
Questions? Find us on gitter.
Website | Documentation | Installation Guide | Getting Started | Contribution Guide
It's super easy to get started and to operate step-ca
thanks to streamlined initialization and safe, sane defaults. Get started in 15 minutes.
- Issue client and server certificates to VMs, containers, devices, and people using internal hostnames and emails
- RFC5280 and CA/Browser Forum compliant certificates that work for TLS and HTTPS
- Choose key types (RSA, ECDSA, EdDSA) & lifetimes to suit your needs
- Short-lived certificates with fully automated enrollment, renewal, and revocation
- Fast, stable, and capable of high availability deployment using root federation and/or multiple intermediaries
- Operate as an online intermediate for an existing root CA
- Pluggable database backends for persistence
- Helm charts, autocert, and cert-manager integration for kubernetes
- Single sign-on using Okta, GSuite, Active Directory, or any other OAuth OIDC identity provider
- Instance identity documents for VMs on AWS, GCP, and Azure
- Single-use short-lived tokens issued by your CD tool β Puppet, Chef, Ansible, Terraform, etc.
- Use an existing certificate from another CA (e.g., using a device certificate like Twilio's Trust OnBoard) coming soon
- Issue certificates using ACMEv2 (RFC8555), the protocol used by Let's Encrypt
- Great for using ACME in development & pre-production
- Supports the
http-01
anddns-01
ACME challenge types - Works with any compliant ACME client including certbot, acme.sh, Caddy, and traefik
- Get certificates programmatically (e.g., in Go, Python, Node.js)
- Use certificate authentication for SSH: connect SSH to SSO, improve security, and eliminate warnings & errors
- Issue SSH user certificates using OAuth OIDC
- Issue SSH host certificates to cloud VMs using instance identity documents
Easy certificate management and automation via step
CLI integration
- Generate key pairs where they're needed so private keys are never transmitted across the network
- Authenticate and obtain a certificate using any enrollment mechanism supported by
step-ca
- Securely distribute root certificates and bootstrap PKI relying parties
- Renew and revoke certificates issued by
step-ca
- Install root certificates so your CA is trusted by default (issue development certificates that work in browsers)
- Inspect and lint certificates
Managing your own public key infrastructure (PKI) can be tedious and error prone. Good security hygiene is hard. Setting up simple PKI is out of reach for many small teams, and following best practices like proper certificate revocation and rolling is challenging even for experts.
Amongst numerous use cases, proper PKI makes it easy to use mTLS (mutual TLS) to improve security and to make it possible to connect services across the public internet. Unlike VPNs & SDNs, deploying and scaling mTLS is pretty easy. You're (hopefully) already using TLS, and your existing tools and standard libraries will provide most of what you need. If you know how to operate DNS and reverse proxies, you know how to operate mTLS infrastructure.
There's just one problem: you need certificates issued by your own certificate authority (CA). Building and operating a CA, issuing certificates, and making sure they're renewed before they expire is tricky. This project provides the infrastructure, automations, and workflows you'll need.
step certificates
is part of smallstep's broader security architecture, which
makes it much easier to implement good security practices early, and
incrementally improve them as your system matures.
For more information and docs see the smallstep website and the blog post announcing this project.
These instructions will install an OS specific version of the step-ca
binary on
your local machine.
While step
is not required to run step-ca
, it will make your life easier so you'll probably want to install it too.
Install step
and step-ca
together via Homebrew:
$ brew install step
# Test installation ...
$ step certificate inspect https://smallstep.com
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 326381749415081530968054238478851085504954 (0x3bf265673332db2d0c70e48a163fb7d11ba)
Signature Algorithm: SHA256-RSA
Issuer: C=US,O=Let's Encrypt,CN=Let's Encrypt Authority X3
...
Note: If you have installed
step
previously through thesmallstep/smallstep
tap you will need to run the following commands before installing:$ brew untap smallstep/smallstep $ brew uninstall step
-
[Optional] Install
step
.Download the latest Debian package from
step
releases:$ wget https://github.com/smallstep/cli/releases/download/vX.Y.Z/step-cli_X.Y.Z_amd64.deb
Install the Debian package:
$ sudo dpkg -i step-cli_X.Y.Z_amd64.deb
-
Install
step-ca
.Download the latest Debian package from releases:
$ wget https://github.com/smallstep/certificates/releases/download/vX.Y.Z/step-certificates_X.Y.Z_amd64.deb
Install the Debian package:
$ sudo dpkg -i step-certificates_X.Y.Z_amd64.deb
We are using the Arch User Repository to distribute
step
binaries for Arch Linux.
You can use pacman to install the packages.
We publish helm charts for easy installation on kubernetes:
helm install step-certificates
If you're using Kubernetes, make sure you check out autocert: a kubernetes add-on that builds on
step certificates
to automatically inject TLS/HTTPS certificates into your containers.
$ step version
Smallstep CLI/0.10.0 (darwin/amd64)
Release Date: 2019-04-30 19:01 UTC
$ step-ca version
Smallstep CA/0.10.0 (darwin/amd64)
Release Date: 2019-04-30 19:02 UTC
In the following guide we'll run a simple hello
server that requires clients
to connect over an authorized and encrypted channel using HTTPS. step-ca
will issue certificates to our server, allowing it to authenticate and encrypt
communication. Let's get started!
$ step ca init
β What would you like to name your new PKI? (e.g. Smallstep): Example Inc.
β What DNS names or IP addresses would you like to add to your new CA? (e.g. ca.smallstep.com[,1.1.1.1,etc.]): localhost
β What address will your new CA listen at? (e.g. :443): 127.0.0.1:8080
β What would you like to name the first provisioner for your new CA? (e.g. [email protected]): [email protected]
β What do you want your password to be? [leave empty and we'll generate one]: abc123
Generating root certificate...
all done!
Generating intermediate certificate...
all done!
β Root certificate: /Users/bob/src/github.com/smallstep/step/.step/certs/root_ca.crt
β Root private key: /Users/bob/src/github.com/smallstep/step/.step/secrets/root_ca_key
β Root fingerprint: 702a094e239c9eec6f0dcd0a5f65e595bf7ed6614012825c5fe3d1ae1b2fd6ee
β Intermediate certificate: /Users/bob/src/github.com/smallstep/step/.step/certs/intermediate_ca.crt
β Intermediate private key: /Users/bob/src/github.com/smallstep/step/.step/secrets/intermediate_ca_key
β Default configuration: /Users/bob/src/github.com/smallstep/step/.step/config/defaults.json
β Certificate Authority configuration: /Users/bob/src/github.com/smallstep/step/.step/config/ca.json
Your PKI is ready to go. To generate certificates for individual services see 'step help ca'.
This command will:
- Generate password protected private keys for your CA to sign certificates
- Generate a root and intermediate signing certificate for your CA
- Create a JSON configuration file for
step-ca
(see getting started for details)
You can find these artifacts in $STEPPATH
(or ~/.step
by default).
You'll be prompted for your password from the previous step, to decrypt the CA's private signing key:
$ step-ca $(step path)/config/ca.json
Please enter the password to decrypt /Users/bob/src/github.com/smallstep/step/.step/secrets/intermediate_ca_key: abc123
2019/02/18 13:28:58 Serving HTTPS on 127.0.0.1:8080 ...
$ cat > srv.go <<EOF
package main
import (
"net/http"
"log"
)
func HiHandler(w http.ResponseWriter, req *http.Request) {
w.Header().Set("Content-Type", "text/plain")
w.Write([]byte("Hello, world!\n"))
}
func main() {
http.HandleFunc("/hi", HiHandler)
err := http.ListenAndServeTLS(":8443", "srv.crt", "srv.key", nil)
if err != nil {
log.Fatal(err)
}
}
EOF
$ step ca certificate localhost srv.crt srv.key
β Key ID: rQxROEr7Kx9TNjSQBTETtsu3GKmuW9zm02dMXZ8GUEk ([email protected])
β Please enter the password to decrypt the provisioner key: abc123
β CA: https://localhost:8080/1.0/sign
β Certificate: srv.crt
β Private Key: srv.key
$ step certificate inspect --bundle srv.crt
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 140439335711218707689123407681832384336 (0x69a7a1d7f6f22f68059d2d9088307750)
Signature Algorithm: ECDSA-SHA256
Issuer: CN=Example Inc. Intermediate CA
Validity
Not Before: Feb 18 21:32:35 2019 UTC
Not After : Feb 19 21:32:35 2019 UTC
Subject: CN=localhost
...
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 207035091234452090159026162349261226844 (0x9bc18217bd560cf07db23178ed90835c)
Signature Algorithm: ECDSA-SHA256
Issuer: CN=Example Inc. Root CA
Validity
Not Before: Feb 18 21:27:21 2019 UTC
Not After : Feb 15 21:27:21 2029 UTC
Subject: CN=Example Inc. Intermediate CA
...
Note that step
and step-ca
handle details like certificate bundling for you.
$ go run srv.go &
In a new Terminal window:
$ step ca root root.crt
The root certificate has been saved in root.crt.
$ curl --cacert root.crt https://localhost:8443/hi
Hello, world!
All Done!
Check out the Getting Started guide for more examples and best practices on running Step CA in production.
Documentation can be found in a handful of different places:
-
The docs sub-repo has an index of documentation and tutorials.
-
On the command line with
step ca help xxx
wherexxx
is the subcommand you are interested in. Ex:step help ca provisioners list
. -
On the web at https://smallstep.com/docs/certificates.
-
On your browser by running
step help --http=:8080 ca
from the command line and visiting http://localhost:8080.
We plan to build more tools that facilitate the use and management of zero trust networks.
- Tell us what you like and don't like about managing your PKI - we're eager to help solve problems in this space.
- Tell us what features you'd like to see - open issues or hit us on Twitter.
Check out the Getting Started guide for more examples and best practices on running Step CA in production.