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module CertificateAuthority
class Certificate
include ActiveModel::Validations
include Revocable
attr_accessor :distinguished_name
attr_accessor :serial_number
attr_accessor :key_material
attr_accessor :not_before
attr_accessor :not_after
attr_accessor :extensions
attr_accessor :openssl_body
alias :subject :distinguished_name #Same thing as the DN
attr_accessor :parent
validate do |certificate|
errors.add :base, "Distinguished name must be valid" unless distinguished_name.valid?
errors.add :base, "Key material must be valid" unless key_material.valid?
errors.add :base, "Serial number must be valid" unless serial_number.valid?
errors.add :base, "Extensions must be valid" unless extensions.each do |item|
unless item.respond_to?(:valid?)
true
else
item.valid?
end
end
end
def initialize
self.distinguished_name = DistinguishedName.new
self.serial_number = SerialNumber.new
self.key_material = MemoryKeyMaterial.new
self.not_before = Time.now
self.not_after = Time.now + 60 * 60 * 24 * 365 #One year
self.parent = self
self.extensions = load_extensions()
self.signing_entity = false
end
def sign!(signing_profile={})
raise "Invalid certificate #{self.errors.full_messages}" unless valid?
merge_profile_with_extensions(signing_profile)
openssl_cert = OpenSSL::X509::Certificate.new
openssl_cert.version = 2
openssl_cert.not_before = self.not_before
openssl_cert.not_after = self.not_after
openssl_cert.public_key = self.key_material.public_key
openssl_cert.serial = self.serial_number.number
openssl_cert.subject = self.distinguished_name.to_x509_name
openssl_cert.issuer = parent.distinguished_name.to_x509_name
require 'tempfile'
t = Tempfile.new("bullshit_conf")
# t = File.new("/tmp/openssl.cnf")
## The config requires a file even though we won't use it
openssl_config = OpenSSL::Config.new(t.path)
factory = OpenSSL::X509::ExtensionFactory.new
factory.subject_certificate = openssl_cert
#NB: If the parent doesn't have an SSL body we're making this a self-signed cert
if parent.openssl_body.nil?
factory.issuer_certificate = openssl_cert
else
factory.issuer_certificate = parent.openssl_body
end
self.extensions.keys.each do |k|
config_extensions = extensions[k].config_extensions
openssl_config = merge_options(openssl_config,config_extensions)
end
# p openssl_config.sections
factory.config = openssl_config
# Order matters: e.g. for self-signed, subjectKeyIdentifier must come before authorityKeyIdentifier
self.extensions.keys.sort{|a,b| b<=>a}.each do |k|
e = extensions[k]
next if e.to_s.nil? or e.to_s == "" ## If the extension returns an empty string we won't include it
ext = factory.create_ext(e.openssl_identifier, e.to_s)
openssl_cert.add_extension(ext)
end
if signing_profile["digest"].nil?
digest = OpenSSL::Digest::Digest.new("SHA512")
else
digest = OpenSSL::Digest::Digest.new(signing_profile["digest"])
end
self.openssl_body = openssl_cert.sign(parent.key_material.private_key,digest)
t.close! if t.is_a?(Tempfile)# We can get rid of the ridiculous temp file
self.openssl_body
end
def is_signing_entity?
self.extensions["basicConstraints"].ca
end
def signing_entity=(signing)
self.extensions["basicConstraints"].ca = signing
end
def revoked?
!self.revoked_at.nil?
end
def to_pem
raise "Certificate has no signed body" if self.openssl_body.nil?
self.openssl_body.to_pem
end
def is_root_entity?
self.parent == self && is_signing_entity?
end
def is_intermediate_entity?
(self.parent != self) && is_signing_entity?
end
private
def merge_profile_with_extensions(signing_profile={})
return self.extensions if signing_profile["extensions"].nil?
signing_config = signing_profile["extensions"]
signing_config.keys.each do |k|
extension = self.extensions[k]
items = signing_config[k]
items.keys.each do |profile_item_key|
if extension.respond_to?("#{profile_item_key}=".to_sym)
extension.send("#{profile_item_key}=".to_sym, items[profile_item_key] )
else
p "Tried applying '#{profile_item_key}' to #{extension.class} but it doesn't respond!"
end
end
end
end
def load_extensions
extension_hash = {}
temp_extensions = []
basic_constraints = CertificateAuthority::Extensions::BasicConstraints.new
temp_extensions << basic_constraints
crl_distribution_points = CertificateAuthority::Extensions::CrlDistributionPoints.new
temp_extensions << crl_distribution_points
subject_key_identifier = CertificateAuthority::Extensions::SubjectKeyIdentifier.new
temp_extensions << subject_key_identifier
authority_key_identifier = CertificateAuthority::Extensions::AuthorityKeyIdentifier.new
temp_extensions << authority_key_identifier
authority_info_access = CertificateAuthority::Extensions::AuthorityInfoAccess.new
temp_extensions << authority_info_access
key_usage = CertificateAuthority::Extensions::KeyUsage.new
temp_extensions << key_usage
extended_key_usage = CertificateAuthority::Extensions::ExtendedKeyUsage.new
temp_extensions << extended_key_usage
subject_alternative_name = CertificateAuthority::Extensions::SubjectAlternativeName.new
temp_extensions << subject_alternative_name
certificate_policies = CertificateAuthority::Extensions::CertificatePolicies.new
temp_extensions << certificate_policies
temp_extensions.each do |extension|
extension_hash[extension.openssl_identifier] = extension
end
extension_hash
end
def merge_options(config,hash)
hash.keys.each do |k|
config[k] = hash[k]
end
config
end
def self.from_openssl openssl_cert
unless openssl_cert.is_a? OpenSSL::X509::Certificate
raise "Can only construct from an OpenSSL::X509::Certificate"
end
certificate = Certificate.new
# Only subject, key_material, and body are used for signing
certificate.distinguished_name = DistinguishedName.from_openssl openssl_cert.subject
certificate.key_material.public_key = openssl_cert.public_key
certificate.openssl_body = openssl_cert
certificate.serial_number.number = openssl_cert.serial.to_i
certificate.not_before = openssl_cert.not_before
certificate.not_after = openssl_cert.not_after
# TODO extensions
certificate
end
end
end
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