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Diffstat (limited to 'certs/app/models/leap_ca/cert.rb')
-rw-r--r--certs/app/models/leap_ca/cert.rb104
1 files changed, 99 insertions, 5 deletions
diff --git a/certs/app/models/leap_ca/cert.rb b/certs/app/models/leap_ca/cert.rb
index 9d4f15e..6c59144 100644
--- a/certs/app/models/leap_ca/cert.rb
+++ b/certs/app/models/leap_ca/cert.rb
@@ -3,6 +3,11 @@
#
# This file must be loaded after Config has been loaded.
#
+require 'base64'
+require 'digest/md5'
+require 'openssl'
+require 'certificate_authority'
+require 'date'
module LeapCA
class Cert < CouchRest::Model::Base
@@ -17,7 +22,7 @@ module LeapCA
property :valid_until, Time # expiration time of the client certificate
property :random, Float, :accessible => false # used to help pick a random cert by the webapp
- before_validation :set_random, :on => :create
+ before_validation :generate, :set_random, :on => :create
validates :key, :presence => true
validates :cert, :presence => true
@@ -28,10 +33,6 @@ module LeapCA
view :by_random
end
- def set_random
- self.random = rand
- end
-
class << self
def sample
self.by_random.startkey(rand).first || self.by_random.first
@@ -52,5 +53,98 @@ module LeapCA
end
end
+ #
+ # generate the private key and client certificate
+ #
+ def generate
+ cert = CertificateAuthority::Certificate.new
+
+ # set subject
+ cert.subject.common_name = random_common_name
+
+ # set expiration
+ self.valid_until = months_from_yesterday(Config.client_cert_lifespan)
+ cert.not_before = yesterday
+ cert.not_after = self.valid_until
+
+ # generate key
+ cert.serial_number.number = cert_serial_number
+ cert.key_material.generate_key(Config.client_cert_bit_size)
+
+ # sign
+ cert.parent = Cert.root_ca
+ cert.sign! client_signing_profile
+
+ self.key = cert.key_material.private_key.to_pem
+ self.cert = cert.to_pem
+ end
+
+ private
+
+ def set_random
+ self.random = rand
+ end
+
+ def self.root_ca
+ @root_ca ||= begin
+ crt = File.read(Config.ca_cert_path)
+ key = File.read(Config.ca_key_path)
+ openssl_cert = OpenSSL::X509::Certificate.new(crt)
+ cert = CertificateAuthority::Certificate.from_openssl(openssl_cert)
+ cert.key_material.private_key = OpenSSL::PKey::RSA.new(key, Config.ca_key_password)
+ cert
+ end
+ end
+
+ #
+ # For cert serial numbers, we need a non-colliding number less than 160 bits.
+ # md5 will do nicely, since there is no need for a secure hash, just a short one.
+ # (md5 is 128 bits)
+ #
+ def cert_serial_number
+ Digest::MD5.hexdigest("#{rand(10**10)} -- #{Time.now}").to_i(16)
+ end
+
+ #
+ # for the random common name, we need a text string that will be unique across all certs.
+ # ruby 1.8 doesn't have a built-in uuid generator, or we would use SecureRandom.uuid
+ #
+ def random_common_name
+ cert_serial_number.to_s(36)
+ end
+
+ def client_signing_profile
+ {
+ "digest" => Config.client_cert_hash,
+ "extensions" => {
+ "keyUsage" => {
+ "usage" => ["digitalSignature"]
+ },
+ "extendedKeyUsage" => {
+ "usage" => ["clientAuth"]
+ }
+ }
+ }
+ end
+
+ ##
+ ## TIME HELPERS
+ ##
+ ## note: we use 'yesterday' instead of 'today', because times are in UTC, and some people on the planet
+ ## are behind UTC.
+ ##
+
+ def yesterday
+ t = Time.now - 24*24*60
+ Time.utc t.year, t.month, t.day
+ end
+
+ def months_from_yesterday(num)
+ t = yesterday
+ date = Date.new t.year, t.month, t.day
+ date = date >> num # >> is months in the future operator
+ Time.utc date.year, date.month, date.day
+ end
+
end
end