CODEWITHSUNDEEP
rubyamazon-web-servicessslcertificate
Tomer Shemesh
Tomer Shemesh

Reputation: 13395

How to generate csr and crt files using openssl in ruby

So i'm using AWS Iot and have a server running ruby on rails in the backend. i need to generate some certs for the client and the example on the AWS website only provides a way to do it using the openssl command line. If possible i would like to use the open ssl library in ruby to do this to avoid making ruby run commands in the terminal which may cause issues.
These are the commands i want to replicate using ruby 

openssl genrsa -out deviceCert.key 2048    

openssl req -new -key deviceCert.key -out deviceCert.csr    

openssl x509 -req -in deviceCert.csr -CA sampleCACertificate.pem -CAkey sampleCACertificate.key -CAcreateserial -out deviceCert.crt -days 99999 -sha256

The first line i found and think i can do 

require 'openssl'    
rsa_key = OpenSSL::PKey::RSA.new(2048)

but i'm stuck on the last 2 lines. Any ideas?

Upvotes: 2

Views: 1452

Answers (2)

Tomer Shemesh
Tomer Shemesh

Reputation: 13395

was able to eventually figure it out using this rdoc example http://ruby-doc.org/stdlib-2.0.0/libdoc/openssl/rdoc/OpenSSL/X509/Certificate.html#method-c-new

Upvotes: 0

John Hanley
John Hanley

Reputation: 81396

Here is an example to generate a self signed certificate.

require 'rubygems'
require 'openssl'

key = OpenSSL::PKey::RSA.new(1024)
public_key = key.public_key

subject = "/C=BE/O=Test/OU=Test/CN=Test"

cert = OpenSSL::X509::Certificate.new
cert.subject = cert.issuer = OpenSSL::X509::Name.parse(subject)
cert.not_before = Time.now
cert.not_after = Time.now + 365 * 24 * 60 * 60
cert.public_key = public_key
cert.serial = 0x0
cert.version = 2

ef = OpenSSL::X509::ExtensionFactory.new
ef.subject_certificate = cert
ef.issuer_certificate = cert
cert.extensions = [
  ef.create_extension("basicConstraints","CA:TRUE", true),
  ef.create_extension("subjectKeyIdentifier", "hash"),
  # ef.create_extension("keyUsage", "cRLSign,keyCertSign", true),
]
cert.add_extension ef.create_extension("authorityKeyIdentifier",
                                       "keyid:always,issuer:always")

cert.sign key, OpenSSL::Digest::SHA1.new

puts cert.to_pem

Source for Example

Upvotes: 1

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