s4: Use SASL authentication against Fedora DS.

1. During instance creation the provisioning script will import the SASL
   mapping for samba-admin. It's done here due to missing config schema
   preventing adding the mapping via ldapi.

2. After that it will use ldif2db to import the cn=samba-admin user as
   the target of SASL mapping.

3. Then it will start FDS and continue to do provisioning using the
   Directory Manager with simple bind.

4. The SASL credentials will be stored in secrets.ldb, so when Samba
   server runs later it will use the SASL credentials.

5. After the provisioning is done (just before stopping the slapd)
   it will use the DM over direct ldapi to delete the default SASL
   mappings included automatically by FDS, leaving just the new
   samba-admin mapping.

6. Also before stopping slapd it will use the DM over direct ldapi to
   set the ACL on the root entries of the user, configuration, and
   schema partitions. The ACL will give samba-admin the full access
   to these partitions.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>

1 files changed, 68 insertions, 5 deletions

diff --git a/source4/scripting/python/samba/provision.py b/source4/scripting/python/samba/provision.py
index 778271f1d5..e12d63997c 100644
--- a/source4/scripting/python/samba/provision.py
+++ b/source4/scripting/python/samba/provision.py
@@ -37,6 +37,7 @@ import param
 import registry
 import samba
 import subprocess
+import ldb
 
 import shutil
 from credentials import Credentials, DONT_USE_KERBEROS
@@ -106,6 +107,7 @@ class ProvisionPaths(object):
         self.memberofconf = None
         self.fedoradsinf = None
         self.fedoradspartitions = None
+        self.fedoradssasl = None
         self.olmmron = None
         self.olmmrserveridsconf = None
         self.olmmrsyncreplconf = None
@@ -120,6 +122,7 @@ class ProvisionNames(object):
         self.domaindn = None
         self.configdn = None
         self.schemadn = None
+        self.sambadn = None
         self.ldapmanagerdn = None
         self.dnsdomain = None
         self.realm = None
@@ -139,7 +142,7 @@ class ProvisionResult(object):
         
 class Schema(object):
     def __init__(self, setup_path, schemadn=None, 
-                 serverdn=None):
+                 serverdn=None, sambadn=None, ldap_backend_type=None):
         """Load schema for the SamDB from the AD schema files and samba4_schema.ldif
         
         :param samdb: Load a schema into a SamDB.
@@ -343,6 +346,10 @@ def provision_paths_from_lp(lp, dnsdomain):
                                      "fedorads.inf")
     paths.fedoradspartitions = os.path.join(paths.ldapdir, 
                                             "fedorads-partitions.ldif")
+    paths.fedoradssasl = os.path.join(paths.ldapdir, 
+                                      "fedorads-sasl.ldif")
+    paths.fedoradssamba = os.path.join(paths.ldapdir, 
+                                        "fedorads-samba.ldif")
     paths.olmmrserveridsconf = os.path.join(paths.ldapdir, 
                                             "mmr_serverids.conf")
     paths.olmmrsyncreplconf = os.path.join(paths.ldapdir, 
@@ -369,7 +376,7 @@ def provision_paths_from_lp(lp, dnsdomain):
 
 def guess_names(lp=None, hostname=None, domain=None, dnsdomain=None,
                 serverrole=None, rootdn=None, domaindn=None, configdn=None,
-                schemadn=None, serverdn=None, sitename=None):
+                schemadn=None, serverdn=None, sitename=None, sambadn=None):
     """Guess configuration settings to use."""
 
     if hostname is None:
@@ -421,6 +428,8 @@ def guess_names(lp=None, hostname=None, domain=None, dnsdomain=None,
         configdn = "CN=Configuration," + rootdn
     if schemadn is None:
         schemadn = "CN=Schema," + configdn
+    if sambadn is None:
+        sambadn = "CN=Samba"
 
     if sitename is None:
         sitename=DEFAULTSITE
@@ -430,6 +439,7 @@ def guess_names(lp=None, hostname=None, domain=None, dnsdomain=None,
     names.domaindn = domaindn
     names.configdn = configdn
     names.schemadn = schemadn
+    names.sambadn = sambadn
     names.ldapmanagerdn = "CN=Manager," + rootdn
     names.dnsdomain = dnsdomain
     names.domain = domain
@@ -814,7 +824,8 @@ def setup_samdb(path, setup_path, session_info, credentials, lp,
                            ldap_backend=ldap_backend, serverrole=serverrole)
 
     if (schema == None):
-        schema = Schema(setup_path, schemadn=names.schemadn, serverdn=names.serverdn)
+        schema = Schema(setup_path, schemadn=names.schemadn, serverdn=names.serverdn,
+            sambadn=names.sambadn, ldap_backend_type=ldap_backend.ldap_backend_type)
 
     # Load the database, but importantly, use Ldb not SamDB as we don't want to load the global schema
     samdb = Ldb(session_info=session_info, 
@@ -1079,7 +1090,8 @@ def provision(setup_dir, message, session_info,
 
     ldapi_url = "ldapi://%s" % urllib.quote(paths.s4_ldapi_path, safe="")
     
-    schema = Schema(setup_path, schemadn=names.schemadn, serverdn=names.serverdn)
+    schema = Schema(setup_path, schemadn=names.schemadn, serverdn=names.serverdn,
+        sambadn=names.sambadn, ldap_backend_type=ldap_backend_type)
     
     provision_backend = None
     if ldap_backend_type:
@@ -1112,7 +1124,7 @@ def provision(setup_dir, message, session_info,
     message("Setting up secrets.ldb")
     secrets_ldb = setup_secretsdb(paths.secrets, setup_path, 
                                   session_info=session_info, 
-                                  credentials=credentials, lp=lp)
+                                  credentials=provision_backend.adminCredentials, lp=lp)
 
     message("Setting up the registry")
     setup_registry(paths.hklm, setup_path, session_info, 
@@ -1205,6 +1217,32 @@ def provision(setup_dir, message, session_info,
             message("A Kerberos configuration suitable for Samba 4 has been generated at %s" % paths.krb5conf)
 
 
+    ldapi_db = Ldb(provision_backend.ldapi_uri, lp=lp, credentials=credentials)
+
+    # delete default SASL mappings
+    res = ldapi_db.search(expression="(!(cn=samba-admin mapping))", base="cn=mapping,cn=sasl,cn=config", scope=SCOPE_ONELEVEL, attrs=["dn"])
+
+    for i in range (0, len(res)):
+        dn = str(res[i]["dn"])
+        ldapi_db.delete(dn)
+
+    # configure aci
+    if ldap_backend_type == "fedora-ds":
+
+        aci = """(targetattr = "*") (version 3.0;acl "full access to all by samba-admin";allow (all)(userdn = "ldap:///CN=samba-admin,%s");)""" % names.sambadn
+
+        m = ldb.Message()
+        m["aci"] = ldb.MessageElement([aci], ldb.FLAG_MOD_REPLACE, "aci")
+
+        m.dn = ldb.Dn(1, names.domaindn)
+        ldapi_db.modify(m)
+
+        m.dn = ldb.Dn(1, names.configdn)
+        ldapi_db.modify(m)
+
+        m.dn = ldb.Dn(1, names.schemadn)
+        ldapi_db.modify(m)
+
     # if backend is openldap, terminate slapd after final provision and check its proper termination
     if provision_backend is not None and provision_backend.slapd is not None:
         if provision_backend.slapd.poll() is None:
@@ -1379,6 +1417,12 @@ class ProvisionBackend(object):
         self.credentials.guess(lp)
         #Kerberos to an ldapi:// backend makes no sense
         self.credentials.set_kerberos_state(DONT_USE_KERBEROS)
+
+        self.adminCredentials = Credentials()
+        self.adminCredentials.guess(lp)
+        #Kerberos to an ldapi:// backend makes no sense
+        self.adminCredentials.set_kerberos_state(DONT_USE_KERBEROS)
+
         self.ldap_backend_type = ldap_backend_type
 
         if ldap_backend_type == "fedora-ds":
@@ -1408,6 +1452,8 @@ class ProvisionBackend(object):
             raise ProvisioningError("Unknown LDAP backend type selected")
 
         self.credentials.set_password(ldapadminpass)
+        self.adminCredentials.set_username("samba-admin")
+        self.adminCredentials.set_password(ldapadminpass)
 
         # Now start the slapd, so we can provision onto it.  We keep the
         # subprocess context around, to kill this off at the successful
@@ -1686,6 +1732,16 @@ def provision_fds_backend(result, paths=None, setup_path=None, names=None,
     setup_file(setup_path("fedorads-partitions.ldif"), paths.fedoradspartitions, 
                {"CONFIGDN": names.configdn,
                 "SCHEMADN": names.schemadn,
+                "SAMBADN": names.sambadn,
+                })
+
+    setup_file(setup_path("fedorads-sasl.ldif"), paths.fedoradssasl, 
+               {"SAMBADN": names.sambadn,
+                })
+
+    setup_file(setup_path("fedorads-samba.ldif"), paths.fedoradssamba,
+                {"SAMBADN": names.sambadn, 
+                 "LDAPADMINPASS": ldapadminpass
                 })
 
     mapping = "schema-map-fedora-ds-1.0"
@@ -1726,6 +1782,13 @@ def provision_fds_backend(result, paths=None, setup_path=None, names=None,
     if retcode != 0:
         raise ProvisioningError("setup-ds failed")
 
+    # Load samba-admin
+    retcode = subprocess.call([
+        os.path.join(paths.ldapdir, "slapd-samba4", "ldif2db"), "-s", names.sambadn, "-i", paths.fedoradssamba],
+        close_fds=True, shell=False)
+    if retcode != 0:
+        raise("ldib2db failed")
+
 def create_phpldapadmin_config(path, setup_path, ldapi_uri):
     """Create a PHP LDAP admin configuration file.