Add external CA signing and abstract out the RA backend

External CA signing is a 2-step process. You first have to run the IPA
installer which will generate a CSR. You pass this CSR to your external
CA and get back a cert. You then pass this cert and the CA cert and
re-run the installer. The CSR is always written to /root/ipa.csr.

A run would look like:

 # ipa-server-install --ca --external-ca -p password -a password -r EXAMPLE.COM -u dirsrv -n example.com --hostname=ipa.example.com -U
[ sign cert request ]
 # ipa-server-install --ca --external-ca -p password -a password --external_cert_file=/tmp/rob.crt --external_ca_file=/tmp/cacert.crt  -U -p password -a password -r EXAMPLE.COM -u dirsrv -n example.com --hostname=ipa.example.com

This also abstracts out the RA backend plugin so the self-signed CA we
create can be used in a running server. This means that the cert plugin
can request certs (and nothing else). This should let us do online replica
creation.

To handle the self-signed CA the simple ca_serialno file now contains
additional data so we don't have overlapping serial numbers in replicas.
This isn't used yet. Currently the cert plugin will not work on self-signed
replicas.

One very important change for self-signed CAs is that the CA is no longer
held in the DS database. It is now in the Apache database.

Lots of general fixes were also made in ipaserver.install.certs including:
 - better handling when multiple CA certificates are in a single file
 - A temporary directory for request certs is not always created when the
   class is instantiated (you have to call setup_cert_request())

1 files changed, 126 insertions, 0 deletions

diff --git a/ipaserver/plugins/selfsign.py b/ipaserver/plugins/selfsign.py
new file mode 100644
index 000000000..4bec0665a
--- /dev/null
+++ b/ipaserver/plugins/selfsign.py
@@ -0,0 +1,126 @@
+# Authors:
+#   Rob Crittenden <rcritten@@redhat.com>
+#
+# Copyright (C) 2009  Red Hat
+# see file 'COPYING' for use and warranty information
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; version 2 only
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+"""
+Backend plugin for RA activities.
+
+The `ra` plugin provides access to the CA to issue, retrieve, and revoke
+certificates via the following methods:
+
+    * `ra.check_request_status()` - check certificate request status.
+    * `ra.get_certificate()` - retrieve an existing certificate.
+    * `ra.request_certificate()` - request a new certificate.
+    * `ra.revoke_certificate()` - revoke a certificate.
+    * `ra.take_certificate_off_hold()` - take a certificate off hold.
+"""
+
+from ipalib import api, SkipPluginModule
+if api.env.ra_plugin != 'selfsign':
+    # In this case, abort loading this plugin module...
+    raise SkipPluginModule(reason='selfsign is not selected as RA plugin, it is %s' % api.env.ra_plugin)
+from ipalib import Backend
+from ipalib import errors
+import subprocess
+import os
+from ipaserver.plugins import rabase
+from ipaserver.install import certs
+import tempfile
+from OpenSSL import crypto
+
+class ra(rabase.rabase):
+    """
+    Request Authority backend plugin.
+    """
+
+    def request_certificate(self, csr, request_type='pkcs10'):
+        """
+        Submit certificate signing request.
+
+        :param csr: The certificate signing request.
+        :param request_type: The request type (defaults to ``'pkcs10'``).
+        """
+        (csr_fd, csr_name) = tempfile.mkstemp()
+        os.write(csr_fd, csr)
+        os.close(csr_fd)
+        (cert_fd, cert_name) = tempfile.mkstemp()
+        os.close(cert_fd)
+
+        serialno = certs.next_serial(self.serial_file)
+
+        try:
+            args = [
+                "/usr/bin/certutil",
+                "-C",
+                "-d", self.sec_dir,
+                "-c", "CA certificate",
+                "-i", csr_name,
+                "-o", cert_name,
+                "-m", str(serialno),
+                "-v", "60",
+                "-1",
+                "-5",
+                "-6",
+                "-a",
+                "-f", self.pwd_file]
+            self.log.debug("issue cert: %s" % str(args))
+            p = subprocess.Popen(args,
+                stdin=subprocess.PIPE,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE, close_fds=True)
+            p.stdin.write("0\n1\n2\n3\n9\ny\n")
+            p.stdin.write("0\n9\nn\n")
+            p.stdin.write("1\n9\nn\n")
+            (stdout, stderr) = p.communicate()
+            self.log.debug("stdout = %s" % stdout)
+            self.log.debug("stderr = %s" % stderr)
+        finally:
+            os.remove(csr_name)
+
+        try:
+            cert_fd = open(cert_name)
+            cert = cert_fd.read()
+            cert_fd.close()
+        finally:
+            os.remove(cert_name)
+
+        try:
+            # Grab the subject, reverse it, combine it and return it
+            x509 = crypto.load_certificate(crypto.FILETYPE_PEM, cert)
+            sub = x509.get_subject().get_components()
+            sub.reverse()
+            subject = ""
+            for s in sub:
+                subject = subject + "%s=%s," % (s[0], s[1])
+            subject = subject[:-1]
+
+            serial = x509.get_serial_number()
+        except crypto.Error, e:
+            raise errors.GenericError(format='Unable to decode certificate in entry: %s' % str(e))
+
+        # To make it look like dogtag return just the base64 data.
+        cert = cert.replace('\n','')
+        cert = cert.replace('\r','')
+        s = cert.find('-----BEGIN CERTIFICATE-----')
+        e = cert.find('-----END CERTIFICATE-----')
+        s = s + 27
+        cert = cert[s:e]
+
+        return {'status':0, 'subject': subject, 'certificate':cert, 'serial': "0x%x" % serial}
+
+api.register(ra)