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authorAzul <azul@leap.se>2013-01-26 10:52:36 +0100
committerAzul <azul@leap.se>2013-01-26 10:52:36 +0100
commit195224a989fa57e9a70fa10c0cdd6603295bb0dd (patch)
tree46744babf45aea2c9da4b112317f4746ee4f8d09 /certs/app/models/client_certificate.rb
parent9563ed191556e739c8f99be4d0fc75ac31c8f6cd (diff)
removing the leap_ca namespacing from certs
Diffstat (limited to 'certs/app/models/client_certificate.rb')
-rw-r--r--certs/app/models/client_certificate.rb148
1 files changed, 148 insertions, 0 deletions
diff --git a/certs/app/models/client_certificate.rb b/certs/app/models/client_certificate.rb
new file mode 100644
index 0000000..23b66a2
--- /dev/null
+++ b/certs/app/models/client_certificate.rb
@@ -0,0 +1,148 @@
+#
+# Model for certificates stored in CouchDB.
+#
+# This file must be loaded after Config has been loaded.
+#
+require 'base64'
+require 'digest/md5'
+require 'openssl'
+require 'certificate_authority'
+require 'date'
+
+class ClientCertificate < CouchRest::Model::Base
+
+ # No config yet. use_database LeapCA::Config.db_name
+ use_database 'client_certificates'
+
+ timestamps!
+
+ property :key, String # the client private RSA key
+ property :cert, String # the client x509 certificate, signed by the CA
+ 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 :generate, :set_random, :on => :create
+
+ validates :key, :presence => true
+ validates :cert, :presence => true
+ validates :random, :presence => true
+ validates :random, :numericality => {:greater_than => 0, :less_than => 1}
+
+ design do
+ view :by_random
+ end
+
+ class << self
+ def sample
+ self.by_random.startkey(rand).first || self.by_random.first
+ end
+
+ def pick_from_pool
+ cert = self.sample
+ raise RECORD_NOT_FOUND unless cert
+ cert.destroy
+ return cert
+ rescue RESOURCE_NOT_FOUND
+ retry if self.by_random.count > 0
+ raise RECORD_NOT_FOUND
+ end
+
+ def valid_attributes_hash
+ {:key => "ABCD", :cert => "A123"}
+ 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