Allow full customisability of IPA CA subject DN

Currently only the "subject base" of the IPA CA subject DN can be
customised, via the installer's --subject-base option.  The RDN
"CN=Certificate Authority" is appended to form the subject DN, and
this composition is widely assumed.

Some administrators need more control over the CA subject DN,
especially to satisfy expectations of external CAs when the IPA CA
is to be externally signed.

This patch adds full customisability of the CA subject DN.
Specifically:

- Add the --ca-subject option for specifying the full IPA CA subject
  DN.  Defaults to "CN=Certificate Authority, O=$SUBJECT_BASE".

- ipa-ca-install, when installing a CA in a previous CA-less
  topology, updates DS certmap.conf with the new new CA subject DN.

- DsInstance.find_subject_base no longer looks in certmap.conf,
  because the CA subject DN can be unrelated to the subject base.

Fixes: https://fedorahosted.org/freeipa/ticket/2614
Reviewed-By: Jan Cholasta <jcholast@redhat.com>

ipaserver/install/server/__init__.py

@@ -573,7 +573,8 @@ class ServerReplicaInstall(ServerReplicaInstallInterface):
     Server replica installer
     """
 
-    subject = None
+    subject_base = None
+    ca_subject = None
 
     admin_password = knob(
         bases=ServerReplicaInstallInterface.admin_password,

ipaserver/install/server/install.py

@@ -467,6 +467,10 @@ def install_check(installer):
     if not options.subject_base:
         options.subject_base = installutils.default_subject_base(realm_name)
 
+    if not options.ca_subject:
+        options.ca_subject = \
+            installutils.default_ca_subject_dn(options.subject_base)
+
     if options.http_cert_files:
         if options.http_pin is None:
             options.http_pin = installutils.read_password(
@@ -726,6 +730,7 @@ def install(installer):
                                dm_password, dirsrv_pkcs12_info,
                                idstart=options.idstart, idmax=options.idmax,
                                subject_base=options.subject_base,
+                               ca_subject=options.ca_subject,
                                hbac_allow=not options.no_hbac_allow)
         else:
             ds = dsinstance.DsInstance(fstore=fstore,
@@ -736,6 +741,7 @@ def install(installer):
                                dm_password,
                                idstart=options.idstart, idmax=options.idmax,
                                subject_base=options.subject_base,
+                               ca_subject=options.ca_subject,
                                hbac_allow=not options.no_hbac_allow)
 
         ntpinstance.ntp_ldap_enable(host_name, ds.suffix, realm_name)
@@ -747,7 +753,7 @@ def install(installer):
         installer._ds = ds
         ds.init_info(
             realm_name, host_name, domain_name, dm_password,
-            options.subject_base, 1101, 1100, None)
+            options.subject_base, options.ca_subject, 1101, 1100, None)
 
     if setup_ca:
         if not options.external_cert_files and options.external_ca:

ipaserver/install/server/replicainstall.py

@@ -78,8 +78,7 @@ def install_http_certs(host_name, realm_name, subject_base):
     principal = 'HTTP/%s@%s' % (host_name, realm_name)
     # Obtain certificate for the HTTP service
     nssdir = certs.NSS_DIR
-    subject = subject_base or installutils.default_subject_base(realm_name)
-    db = certs.CertDB(realm_name, nssdir=nssdir, subject_base=subject)
+    db = certs.CertDB(realm_name, nssdir=nssdir, subject_base=subject_base)
     db.request_service_cert('Server-Cert', principal, host_name, True)
 
 
@@ -94,6 +93,11 @@ def install_replica_ds(config, options, ca_is_configured, remote_api,
         pkcs12_info = make_pkcs12_info(config.dir, "dscert.p12",
                                        "dirsrv_pin.txt")
 
+    if ca_is_configured:
+        ca_subject = ca.lookup_ca_subject(remote_api, config.subject_base)
+    else:
+        ca_subject = installutils.default_ca_subject_dn(config.subject_base)
+
     ds = dsinstance.DsInstance(
         config_ldif=options.dirsrv_config_file)
     ds.create_replica(
@@ -103,6 +107,7 @@ def install_replica_ds(config, options, ca_is_configured, remote_api,
         domain_name=config.domain_name,
         dm_password=config.dirman_password,
         subject_base=config.subject_base,
+        ca_subject=ca_subject,
         pkcs12_info=pkcs12_info,
         ca_is_configured=ca_is_configured,
         ca_file=ca_file,
@@ -703,6 +708,10 @@ def install_check(installer):
         raise RuntimeError("CA cert file is not available. Please run "
                            "ipa-replica-prepare to create a new replica file.")
 
+    # look up CA subject name (needed for DS certmap.conf)
+    options.ca_subject = unicode(
+        DN(x509.load_certificate_from_file(cafile).subject))
+
     for pkcs12_name, pin_name in (('dscert.p12', 'dirsrv_pin.txt'),
                                   ('httpcert.p12', 'http_pin.txt')):
         pkcs12_info = make_pkcs12_info(config.dir, pkcs12_name, pin_name)
@@ -737,6 +746,7 @@ def install_check(installer):
                          confdir=paths.ETC_IPA,
                          ldap_uri=ldapuri)
     remote_api.finalize()
+    installer._remote_api = remote_api
     conn = remote_api.Backend.ldap2
     replman = None
     try:
@@ -796,7 +806,6 @@ def install_check(installer):
         if ca_enabled:
             options.realm_name = config.realm_name
             options.host_name = config.host_name
-            options.subject_base = config.subject_base
             ca.install_check(False, config, options)
 
         if kra_enabled:
@@ -855,7 +864,6 @@ def install_check(installer):
     installer._ca_enabled = ca_enabled
     installer._kra_enabled = kra_enabled
     installer._ca_file = cafile
-    installer._remote_api = remote_api
     installer._fstore = fstore
     installer._sstore = sstore
 
@@ -1067,6 +1075,7 @@ def promote_check(installer):
                          ldap_uri=ldapuri,
                          xmlrpc_uri=xmlrpc_uri)
     remote_api.finalize()
+    installer._remote_api = remote_api
 
     check_remote_version(remote_api)
 
@@ -1203,7 +1212,6 @@ def promote_check(installer):
         if ca_enabled:
             options.realm_name = config.realm_name
             options.host_name = config.host_name
-            options.subject_base = config.subject_base
             ca.install_check(False, config, options)
 
         if kra_enabled:
@@ -1263,7 +1271,6 @@ def promote_check(installer):
     installer._fstore = fstore
     installer._sstore = sstore
     installer._config = config
-    installer._remote_api = remote_api
     installer._add_to_ipaservers = add_to_ipaservers
     installer._dirsrv_pkcs12_file = dirsrv_pkcs12_file
     installer._dirsrv_pkcs12_info = dirsrv_pkcs12_info