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Certificate renewal can be done only one one CA as the certificates need to be shared amongst them. certmonger has been trained to communicate directly with dogtag to perform the renewals. The initial CA installation is the defacto certificate renewal master. A copy of the certificate is stored in the IPA LDAP tree in cn=ca_renewal,cn=ipa,cn=etc,$SUFFIX, the rdn being the nickname of the certificate, when a certificate is renewed. Only the most current certificate is stored. It is valid to have no certificates there, it means that no renewals have taken place. The clones are configured with a new certmonger CA type that polls this location in the IPA tree looking for an updated certificate. If one is not found then certmonger is put into the CA_WORKING state and will poll every 8 hours until an updated certificate is available. The RA agent certificate, ipaCert in /etc/httpd/alias, is a special case. When this certificate is updated we also need to update its entry in the dogtag tree, adding the updated certificate and telling dogtag which certificate to use. This is the certificate that lets IPA issue certificates. On upgrades we check to see if the certificate tracking is already in place. If not then we need to determine if this is the master that will do the renewals or not. This decision is made based on whether it was the first master installed. It is concievable that this master is no longer available meaning that none are actually tracking renewal. We will need to document this. https://fedorahosted.org/freeipa/ticket/2803
97 lines
3.5 KiB
Python
97 lines
3.5 KiB
Python
#!/usr/bin/python -E
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#
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# Authors:
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# Rob Crittenden <rcritten@redhat.com>
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#
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# Copyright (C) 2012 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import sys
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import shutil
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import tempfile
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import syslog
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from ipapython import services as ipaservices
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from ipapython.certmonger import get_pin
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from ipapython import ipautil
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from ipaserver.install import certs
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from ipaserver.install.cainstance import DEFAULT_DSPORT
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from ipalib import api
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from ipalib.dn import DN
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from ipalib import x509
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from ipalib import errors
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from ipaserver.plugins.ldap2 import ldap2
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api.bootstrap(context='restart')
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api.finalize()
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# Fetch the new certificate
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db = certs.CertDB(api.env.realm)
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cert = db.get_cert_from_db('ipaCert', pem=False)
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serial_number = x509.get_serial_number(cert, datatype=x509.DER)
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subject = x509.get_subject(cert, datatype=x509.DER)
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issuer = x509.get_issuer(cert, datatype=x509.DER)
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# Load it into dogtag
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dn = str(DN(('uid','ipara'),('ou','People'),('o','ipaca')))
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try:
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dm_password = get_pin('internaldb')
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except IOError, e:
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syslog.syslog(syslog.LOG_ERR, 'Unable to determine PIN for CA instance: %s' % e)
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sys.exit(1)
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try:
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conn = ldap2(shared_instance=False, ldap_uri='ldap://localhost:%d' % DEFAULT_DSPORT)
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conn.connect(bind_dn='cn=directory manager', bind_pw=dm_password)
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(entry_dn, entry_attrs) = conn.get_entry(dn, ['usercertificate'], normalize=False)
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entry_attrs['usercertificate'].append(cert)
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entry_attrs['description'] = '2;%d;%s;%s' % (serial_number, issuer, subject)
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conn.update_entry(dn, entry_attrs, normalize=False)
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conn.disconnect()
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except Exception, e:
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syslog.syslog(syslog.LOG_ERR, 'Updating agent entry failed: %s' % e)
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sys.exit(1)
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# Store it in the IPA LDAP server
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tmpdir = tempfile.mkdtemp(prefix = "tmp-")
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try:
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dn = str(DN(('cn','ipaCert'),('cn=ca_renewal,cn=ipa,cn=etc'),(api.env.basedn)))
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principal = str('host/%s@%s' % (api.env.host, api.env.realm))
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ccache = ipautil.kinit_hostprincipal('/etc/krb5.keytab', tmpdir, principal)
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conn = ldap2(shared_instance=False, ldap_uri=api.env.ldap_uri)
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conn.connect(ccache=ccache)
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try:
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(entry_dn, entry_attrs) = conn.get_entry(dn, ['usercertificate'])
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entry_attrs['usercertificate'] = cert
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conn.update_entry(dn, entry_attrs, normalize=False)
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except errors.NotFound:
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entry_attrs = dict(objectclass=['top', 'pkiuser', 'nscontainer'],
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usercertificate=cert)
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conn.add_entry(dn, entry_attrs, normalize=False)
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except errors.EmptyModlist:
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pass
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conn.disconnect()
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except Exception, e:
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syslog.syslog(syslog.LOG_ERR, 'Updating renewal certificate failed: %s' % e)
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finally:
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shutil.rmtree(tmpdir)
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# Now restart Apache so the new certificate is available
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try:
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ipaservices.knownservices.httpd.restart()
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except Exception, e:
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syslog.syslog(syslog.LOG_ERR, "Cannot restart httpd: %s" % str(e))
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