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| # Copyright © 2020 Nicky Peeters | |
| # Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: | |
| # The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. | |
| # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| 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 |
awesome :)
Thanks for saving me hours to figure out confusing key cert stuff!
Brilliant, thanks a bunch. (Y)
While this isn't immediately insecure, standard cert defaults these days are 2048 bit keys and SHA256 digests.
key = OpenSSL::PKey::RSA.new(2048)
...
cert.sign key, OpenSSL::Digest::SHA256.new
Thanks for sharing!
Why are some of the extensions set directly on cert.extensions, and one is added using cert.add_extension? In the example in the documentation, they only use add_extension: https://ruby-doc.org/stdlib-2.4.0/libdoc/openssl/rdoc/OpenSSL/X509/Certificate.html
Thanks! I made it into a gem 😄 https://github.com/mltsy/fauthentic
OpenSSL::PKey::RSA.new(1024)
1024 bits keys are not secure anymore as well as 2048. 4096 bits are fine.
How do you get the CA from that?
cert.pem returns the server certificate, right? What about the client certificate? How do you get that?
Thank you!
Thanks. This code was exactly what we needed and we've been using it for a while now. Unfortunately our company just ran a BlackDuck scan on our code and this is now being flagged as "unlicensed" because there is no explicit license statement on this page. I don't suppose you could give it a license (e.g. MIT?) so we can continue to use it? Many thanks.
@antonyedwards I've added the MIT licence. Enjoy!
This is exactly what I was looking for when I googled "generate self signed certificate ruby." Thanks so much for this!