Have certmonger track the initial Apache and 389-ds server certs.

We don't use certmonger to get certificates during installation because
of the chicken-and-egg problem. This means that the IPA web and ldap
certs aren't being tracked for renewal.

This requires some manual changes to the certmonger request files once
tracking has begun because it doesn't store a subject or principal template
when a cert is added via start-tracking.

This also required some changes to the cert command plugin to allow a
host to execute calls against its own service certs.

ticket 67

ipalib/plugins/cert.py

@@ -417,7 +417,16 @@ class cert_show(VirtualCommand):
     operation="retrieve certificate"
 
     def execute(self, serial_number):
-        self.check_access()
+        hostname = None
+        try:
+            self.check_access()
+        except errors.ACIError, acierr:
+            self.debug("Not granted by ACI to retrieve certificate, looking at principal")
+            bind_principal = getattr(context, 'principal')
+            if not bind_principal.startswith('host/'):
+                raise acierr
+            hostname = get_host_from_principal(bind_principal)
+
         result=self.Backend.ra.get_certificate(serial_number)
         cert = x509.load_certificate(result['certificate'])
         result['subject'] = unicode(cert.subject)
@@ -426,6 +435,12 @@ class cert_show(VirtualCommand):
         result['valid_not_after'] = unicode(cert.valid_not_after_str)
         result['md5_fingerprint'] = unicode(nss.data_to_hex(nss.md5_digest(cert.der_data), 64)[0])
         result['sha1_fingerprint'] = unicode(nss.data_to_hex(nss.sha1_digest(cert.der_data), 64)[0])
+        if hostname:
+            # If we have a hostname we want to verify that the subject
+            # of the certificate matches it, otherwise raise an error
+            if hostname != cert.subject.common_name:
+                raise acierr
+
         return dict(result=result)
 
 api.register(cert_show)
@@ -457,7 +472,17 @@ class cert_revoke(VirtualCommand):
     )
 
     def execute(self, serial_number, **kw):
-        self.check_access()
+        hostname = None
+        try:
+            self.check_access()
+        except errors.ACIError, acierr:
+            self.debug("Not granted by ACI to revoke certificate, looking at principal")
+            try:
+                # Let cert_show() handle verifying that the subject of the
+                # cert we're dealing with matches the hostname in the principal
+                result = api.Command['cert_show'](unicode(serial_number))['result']
+            except errors.NotImplementedError:
+                pass
         return dict(
             result=self.Backend.ra.revoke_certificate(serial_number, **kw)
         )

ipaserver/install/Makefile.am

@@ -15,6 +15,7 @@ app_PYTHON = 			\
 	replication.py		\
 	certs.py		\
         ldapupdate.py		\
+        certmonger.py		\
 	$(NULL)
 
 EXTRA_DIST =			\

ipaserver/install/certmonger.py

@@ -0,0 +1,152 @@
+# Authors: Rob Crittenden <rcritten@redhat.com>
+#
+# Copyright (C) 2010  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
+#
+
+# Some certmonger functions, mostly around updating the request file.
+# This is used so we can add tracking to the Apache and 389-ds
+# server certificates created during the IPA server installation.
+
+import os
+import re
+import time
+from ipapython import ipautil
+
+REQUEST_DIR='/var/lib/certmonger/requests/'
+
+def find_request_value(filename, directive):
+    """
+    Return a value from a certmonger request file for the requested directive
+
+    It tries to do this a number of times because sometimes there is a delay
+    when ipa-getcert returns and the file is fully updated, particularly
+    when doing a request. Genrerating a CSR is fast but not instantaneous.
+    """
+    tries = 1
+    value = None
+    found = False
+    while value is None and tries <= 5:
+        tries=tries + 1
+        time.sleep(1)
+        fp = open(filename, 'r')
+        lines = fp.readlines()
+        fp.close()
+
+        for line in lines:
+            if found:
+                # A value can span multiple lines. If it does then it has a
+                # leading space.
+                if not line.startswith(' '):
+                    # We hit the next directive, return now
+                    return value
+                else:
+                    value = value + line[1:]
+            else:
+                if line.startswith(directive + '='):
+                    found = True
+                    value = line[len(directive)+1:]
+
+    return value
+
+def get_request_value(request_id, directive):
+    """
+    There is no guarantee that the request_id will match the filename
+    in the certmonger requests directory, so open each one to find the
+    request_id.
+    """
+    fileList=os.listdir(REQUEST_DIR)
+    for file in fileList:
+        value = find_request_value('%s/%s' % (REQUEST_DIR, file), 'id')
+        if value is not None and value.rstrip() == request_id:
+            return find_request_value('%s/%s' % (REQUEST_DIR, file), directive)
+
+    return None
+
+def add_request_value(request_id, directive, value):
+    """
+    Add a new directive to a certmonger request file.
+
+    The certmonger service MUST be stopped in order for this to work.
+    """
+    fileList=os.listdir(REQUEST_DIR)
+    for file in fileList:
+        id = find_request_value('%s/%s' % (REQUEST_DIR, file), 'id')
+        if id is not None and id.rstrip() == request_id:
+            current_value = find_request_value('%s/%s' % (REQUEST_DIR, file), directive)
+            if not current_value:
+                fp = open('%s/%s' % (REQUEST_DIR, file), 'a')
+                fp.write('%s=%s\n' % (directive, value))
+                fp.close()
+
+    return
+
+def add_principal(request_id, principal):
+    """
+    In order for a certmonger request to be renwable it needs a principal.
+
+    When an existing certificate is added via start-tracking it won't have
+    a principal.
+    """
+    return add_request_value(request_id, 'template_principal', principal)
+
+def add_subject(request_id, subject):
+    """
+    In order for a certmonger request to be renwable it needs the subject
+    set in the request file.
+
+    When an existing certificate is added via start-tracking it won't have
+    a subject_template set.
+    """
+    return add_request_value(request_id, 'template_subject', subject)
+
+def request_cert(nssdb, nickname, subject, principal, passwd_fname=None):
+    """
+    Execute certmonger to request a server certificate
+    """
+    args = ['/usr/bin/ipa-getcert',
+            'request',
+            '-d', nssdb,
+            '-n', nickname,
+            '-N', subject,
+            '-K', principal,
+    ]
+    if passwd_fname:
+        args.append('-p')
+        args.append(passwd_fname)
+    (stdout, stderr, returncode) = ipautil.run(args)
+    # FIXME: should be some error handling around this
+    m = re.match('New signing request "(\d+)" added', stdout)
+    request_id = m.group(1)
+    return request_id
+
+def stop_tracking(request_id):
+    """
+    Stop tracking the current request.
+
+    This assumes that the certmonger service is running.
+    """
+    args = ['/usr/bin/ipa-getcert',
+            'stop-tracking',
+            '-i', request_id
+    ]
+    (stdout, stderr, returncode) = ipautil.run(args)
+
+if __name__ == '__main__':
+    request_id = request_cert("/etc/httpd/alias", "Test", "cn=tiger.example.com,O=IPA", "HTTP/tiger.example.com@EXAMPLE.COM")
+    csr = get_request_value(request_id, 'csr')
+    print csr
+    stop_tracking(request_id)

ipaserver/install/certs.py

@@ -34,6 +34,9 @@ from ipapython import sysrestore
 from ipapython import ipautil
 from ipalib import pkcs10
 from ConfigParser import RawConfigParser
+import service
+import certmonger
+from ipalib import x509
 
 from nss.error import NSPRError
 import nss.nss as nss
@@ -432,6 +435,51 @@ class CertDB(object):
 
         raise RuntimeError("Unable to find serial number")
 
+    def track_server_cert(self, nickname, principal, password_file=None):
+        """
+        Tell certmonger to track the given certificate nickname.
+        """
+        service.chkconfig_on("certmonger")
+        service.start("certmonger")
+        args = ["/usr/bin/ipa-getcert", "start-tracking",
+                "-d", self.secdir,
+                "-n", nickname]
+        if password_file:
+            args.append("-p")
+            args.append(password_file)
+        try:
+            (stdout, stderr, returncode) = ipautil.run(args)
+        except ipautil.CalledProcessError, e:
+            logging.error("tracking certificate failed: %s" % str(e))
+
+        service.stop("certmonger")
+        cert = self.get_cert_from_db(nickname)
+        subject = str(x509.get_subject(cert))
+        m = re.match('New tracking request "(\d+)" added', stdout)
+        request_id = m.group(1)
+
+        certmonger.add_principal(request_id, principal)
+        certmonger.add_subject(request_id, subject)
+
+        service.start("certmonger")
+
+    def untrack_server_cert(self, nickname):
+        """
+        Tell certmonger to stop tracking the given certificate nickname.
+        """
+
+        # Always start certmonger. We can't untrack something if it isn't
+        # running
+        service.start("certmonger")
+        args = ["/usr/bin/ipa-getcert", "stop-tracking",
+                "-d", self.secdir,
+                "-n", nickname]
+        try:
+            (stdout, stderr, returncode) = ipautil.run(args)
+        except ipautil.CalledProcessError, e:
+            logging.error("untracking certificate failed: %s" % str(e))
+        service.stop("certmonger")
+
     def create_server_cert(self, nickname, hostname, other_certdb=None, subject=None):
         """
         other_certdb can mean one of two things, depending on the context.
@@ -449,7 +497,7 @@ class CertDB(object):
             cdb = self
         if subject is None:
             subject=self.subject_format % hostname
-        (out, err) = self.request_cert(subject)
+        self.request_cert(subject)
         cdb.issue_server_cert(self.certreq_fname, self.certder_fname)
         self.add_cert(self.certder_fname, nickname)
         fd = open(self.certder_fname, "r")
@@ -486,7 +534,6 @@ class CertDB(object):
             args.append("-a")
         (stdout, stderr, returncode) = self.run_certutil(args)
         os.remove(self.noise_fname)
-
         return (stdout, stderr)
 
     def issue_server_cert(self, certreq_fname, cert_fname):

ipaserver/install/dsinstance.py

@@ -165,7 +165,7 @@ class DsInstance(service.Service):
         self.sub_dict = None
         self.domain = domain_name
         self.serverid = None
-        self.host_name = None
+        self.fqdn = None
         self.pkcs12_info = None
         self.ds_user = None
         self.dercert = None
@@ -177,19 +177,19 @@ class DsInstance(service.Service):
         else:
             self.suffix = None
 
-    def create_instance(self, ds_user, realm_name, host_name, domain_name, dm_password, pkcs12_info=None, self_signed_ca=False, uidstart=1100, gidstart=1100, subject_base=None, hbac_allow=True):
+    def create_instance(self, ds_user, realm_name, fqdn, domain_name, dm_password, pkcs12_info=None, self_signed_ca=False, uidstart=1100, gidstart=1100, subject_base=None, hbac_allow=True):
         self.ds_user = ds_user
         self.realm_name = realm_name.upper()
         self.serverid = realm_to_serverid(self.realm_name)
         self.suffix = util.realm_to_suffix(self.realm_name)
-        self.host_name = host_name
+        self.fqdn = fqdn
         self.dm_password = dm_password
         self.domain = domain_name
         self.pkcs12_info = pkcs12_info
         self.self_signed_ca = self_signed_ca
         self.uidstart = uidstart
         self.gidstart = gidstart
-        self.principal = "ldap/%s@%s" % (self.host_name, self.realm_name)
+        self.principal = "ldap/%s@%s" % (self.fqdn, self.realm_name)
         self.subject_base = subject_base
         self.__setup_sub_dict()
 
@@ -232,12 +232,12 @@ class DsInstance(service.Service):
 
     def __setup_sub_dict(self):
         server_root = find_server_root()
-        self.sub_dict = dict(FQHN=self.host_name, SERVERID=self.serverid,
+        self.sub_dict = dict(FQHN=self.fqdn, SERVERID=self.serverid,
                              PASSWORD=self.dm_password, SUFFIX=self.suffix.lower(),
                              REALM=self.realm_name, USER=self.ds_user,
                              SERVER_ROOT=server_root, DOMAIN=self.domain,
                              TIME=int(time.time()), UIDSTART=self.uidstart,
-                             GIDSTART=self.gidstart, HOST=self.host_name,
+                             GIDSTART=self.gidstart, HOST=self.fqdn,
                              ESCAPED_SUFFIX= escape_dn_chars(self.suffix.lower()),
                          )
 
@@ -356,7 +356,7 @@ class DsInstance(service.Service):
 
     def __config_uidgid_gen_first_master(self):
         if (self.uidstart == self.gidstart and
-            has_managed_entries(self.host_name, self.dm_password)):
+            has_managed_entries(self.fqdn, self.dm_password)):
             self._ldap_mod("dna-upg.ldif", self.sub_dict)
         else:
             self._ldap_mod("dna-posix.ldif", self.sub_dict)
@@ -377,7 +377,7 @@ class DsInstance(service.Service):
         self._ldap_mod("version-conf.ldif")
 
     def __user_private_groups(self):
-        if has_managed_entries(self.host_name, self.dm_password):
+        if has_managed_entries(self.fqdn, self.dm_password):
             self._ldap_mod("user_private_groups.ldif", self.sub_dict)
 
     def __add_enrollment_module(self):
@@ -397,17 +397,19 @@ class DsInstance(service.Service):
             self.dercert = dsdb.get_cert_from_db(nickname)
         else:
             nickname = "Server-Cert"
-            cadb = certs.CertDB(httpinstance.NSS_DIR, host_name=self.host_name, subject_base=self.subject_base)
+            cadb = certs.CertDB(httpinstance.NSS_DIR, host_name=self.fqdn, subject_base=self.subject_base)
             if self.self_signed_ca:
                 cadb.create_self_signed()
                 dsdb.create_from_cacert(cadb.cacert_fname, passwd=None)
-                self.dercert = dsdb.create_server_cert("Server-Cert", self.host_name, cadb)
+                self.dercert = dsdb.create_server_cert("Server-Cert", self.fqdn, cadb)
+                dsdb.track_server_cert("Server-Cert", self.principal, dsdb.passwd_fname)
                 dsdb.create_pin_file()
             else:
                 # FIXME, need to set this nickname in the RA plugin
                 cadb.export_ca_cert('ipaCert', False)
                 dsdb.create_from_cacert(cadb.cacert_fname, passwd=None)
-                self.dercert = dsdb.create_server_cert("Server-Cert", self.host_name, cadb)
+                self.dercert = dsdb.create_server_cert("Server-Cert", self.fqdn, cadb)
+                dsdb.track_server_cert("Server-Cert", self.principal, dsdb.passwd_fname)
                 dsdb.create_pin_file()
 
         conn = ipaldap.IPAdmin("127.0.0.1")
@@ -491,6 +493,9 @@ class DsInstance(service.Service):
 
         serverid = self.restore_state("serverid")
         if not serverid is None:
+            dirname = config_dirname(serverid)
+            dsdb = certs.CertDB(dirname)
+            dsdb.untrack_server_cert("Server-Cert")
             erase_ds_instance_data(serverid)
 
         ds_user = self.restore_state("user")

ipaserver/install/httpinstance.py

@@ -120,10 +120,9 @@ class HTTPInstance(service.Service):
                 self.print_msg(selinux_warning)
 
     def __create_http_keytab(self):
-        http_principal = "HTTP/" + self.fqdn + "@" + self.realm
+        installutils.kadmin_addprinc(self.principal)
-        installutils.kadmin_addprinc(http_principal)
+        installutils.create_keytab("/etc/httpd/conf/ipa.keytab", self.principal)
-        installutils.create_keytab("/etc/httpd/conf/ipa.keytab", http_principal)
+        self.move_service(self.principal)
-        self.move_service(http_principal)
         self.add_cert_to_service()
 
         pent = pwd.getpwnam("apache")
@@ -186,9 +185,11 @@ class HTTPInstance(service.Service):
                 db.create_from_cacert(ca_db.cacert_fname)
                 db.create_password_conf()
                 self.dercert = db.create_server_cert("Server-Cert", self.fqdn, ca_db)
+                db.track_server_cert("Server-Cert", self.principal, db.passwd_fname)
                 db.create_signing_cert("Signing-Cert", "Object Signing Cert", ca_db)
             else:
                 self.dercert = db.create_server_cert("Server-Cert", self.fqdn, ca_db)
+                db.track_server_cert("Server-Cert", self.principal, db.passwd_fname)
                 db.create_signing_cert("Signing-Cert", "Object Signing Cert", ca_db)
                 db.create_password_conf()
 
@@ -251,6 +252,8 @@ class HTTPInstance(service.Service):
         if not running is None:
             self.stop()
 
+        db = certs.CertDB(NSS_DIR)
+        db.untrack_server_cert("Server-Cert")
         if not enabled is None and not enabled:
             self.chkconfig_off()
 

ipaserver/install/service.py

@@ -145,12 +145,14 @@ class Service:
             conn.unbind()
             return
         newdn = "krbprincipalname=%s,cn=services,cn=accounts,%s" % (principal, self.suffix)
+        hostdn = "fqdn=%s,cn=computers,cn=accounts,%s" % (self.fqdn, self.suffix)
         conn.deleteEntry(dn)
         entry.dn = newdn
         classes = entry.getValues("objectclass")
         classes = classes + ["ipaobject", "ipaservice", "pkiuser"]
         entry.setValues("objectclass", list(set(classes)))
         entry.setValue("ipauniqueid", str(uuid.uuid1()))
+        entry.setValue("managedby", hostdn)
         conn.addEntry(entry)
         conn.unbind()
         return newdn