Allow PassSync user to locate and update NT users

Add new PassSync Service privilege that have sufficient access to
let AD PassSync service search for NT users and update the password.
To make sure existing PassSync user keeps working, it is added as
a member of the new privilege.

New update plugin is added to add link to the new privilege to the
potentially existing PassSync user to avoid breaking the PassSync
service.

https://fedorahosted.org/freeipa/ticket/4837

Reviewed-By: David Kupka <dkupka@redhat.com>

ACI.txt

@@ -269,6 +269,8 @@ aci: (targetattr = "krblastadminunlock || krblastfailedauth || krblastpwdchange
 dn: cn=users,cn=accounts,dc=ipa,dc=example
 aci: (targetattr = "memberof")(targetfilter = "(objectclass=posixaccount)")(version 3.0;acl "permission:System: Read User Membership";allow (compare,read,search) userdn = "ldap:///all";)
 dn: cn=users,cn=accounts,dc=ipa,dc=example
+aci: (targetattr = "ntuniqueid || ntuseracctexpires || ntusercodepage || ntuserdeleteaccount || ntuserdomainid || ntuserlastlogoff || ntuserlastlogon")(targetfilter = "(objectclass=posixaccount)")(version 3.0;acl "permission:System: Read User NT Attributes";allow (compare,read,search) groupdn = "ldap:///cn=System: Read User NT Attributes,cn=permissions,cn=pbac,dc=ipa,dc=example";)
+dn: cn=users,cn=accounts,dc=ipa,dc=example
 aci: (targetattr = "cn || createtimestamp || description || displayname || entryusn || gecos || gidnumber || givenname || homedirectory || initials || ipantsecurityidentifier || loginshell || manager || modifytimestamp || objectclass || sn || title || uid || uidnumber")(targetfilter = "(objectclass=posixaccount)")(version 3.0;acl "permission:System: Read User Standard Attributes";allow (compare,read,search) userdn = "ldap:///anyone";)
 dn: dc=ipa,dc=example
 aci: (targetattr = "cn || createtimestamp || entryusn || gecos || gidnumber || homedirectory || loginshell || modifytimestamp || objectclass || uid || uidnumber")(target = "ldap:///cn=users,cn=*,cn=views,cn=compat,dc=ipa,dc=example")(version 3.0;acl "permission:System: Read User Views Compat Tree";allow (compare,read,search) userdn = "ldap:///anyone";)

install/updates/40-delegation.update

@@ -184,3 +184,33 @@ default:description: Read list of IPA masters
 dn: cn=masters,cn=ipa,cn=etc,$SUFFIX
 add:aci:'(targetfilter = "(objectClass=nsContainer)")(targetattr = "cn || objectClass || ipaConfigString")(version 3.0; acl "Read IPA Masters"; allow (read, search, compare) userdn = "ldap:///fqdn=$FQDN,cn=computers,cn=accounts,$SUFFIX";)'
 add:aci:'(targetfilter = "(objectClass=nsContainer)")(targetattr = "ipaConfigString")(version 3.0; acl "Modify IPA Masters"; allow (write) userdn = "ldap:///fqdn=$FQDN,cn=computers,cn=accounts,$SUFFIX";)'
+
+# PassSync
+dn: cn=PassSync Service,cn=privileges,cn=pbac,$SUFFIX
+default:objectClass: nestedgroup
+default:objectClass: groupofnames
+default:objectClass: top
+default:cn: PassSync Service
+default:description: PassSync Service
+
+dn: cn=Read PassSync Managers Configuration,cn=permissions,cn=pbac,$SUFFIX
+default:objectClass: groupofnames
+default:objectClass: ipapermission
+default:objectClass: top
+default:cn: Read PassSync Managers Configuration
+default:member: cn=Replication Administrators,cn=privileges,cn=pbac,$SUFFIX
+default:ipapermissiontype: SYSTEM
+
+dn: cn=config
+add:aci: '(targetattr = "cn || createtimestamp || entryusn || modifytimestamp || objectclass || passsyncmanagersdns*")(target = "ldap:///cn=ipa_pwd_extop,cn=plugins,cn=config")(version 3.0;acl "permission:Read PassSync Managers Configuration";allow (compare,read,search) groupdn = "ldap:///cn=Read PassSync Managers Configuration,cn=permissions,cn=pbac,$SUFFIX";)'
+
+dn: cn=Modify PassSync Managers Configuration,cn=permissions,cn=pbac,$SUFFIX
+default:objectClass: groupofnames
+default:objectClass: ipapermission
+default:objectClass: top
+default:cn: Modify PassSync Managers Configuration
+default:member: cn=Replication Administrators,cn=privileges,cn=pbac,$SUFFIX
+default:ipapermissiontype: SYSTEM
+
+dn: cn=config
+add:aci: '(targetattr = "passsyncmanagersdns*")(target = "ldap:///cn=ipa_pwd_extop,cn=plugins,cn=config")(version 3.0;acl "permission:Modify PassSync Managers Configuration";allow (write) groupdn = "ldap:///cn=Modify PassSync Managers Configuration,cn=permissions,cn=pbac,$SUFFIX";)'

ipalib/plugins/user.py

@@ -373,10 +373,12 @@ class user(LDAPObject):
             'replaces': [
                 '(target = "ldap:///uid=*,cn=users,cn=accounts,$SUFFIX")(targetattr = "userpassword || krbprincipalkey || sambalmpassword || sambantpassword || passwordhistory")(version 3.0;acl "permission:Change a user password";allow (write) groupdn = "ldap:///cn=Change a user password,cn=permissions,cn=pbac,$SUFFIX";)',
                 '(targetfilter = "(!(memberOf=cn=admins,cn=groups,cn=accounts,$SUFFIX))")(target = "ldap:///uid=*,cn=users,cn=accounts,$SUFFIX")(targetattr = "userpassword || krbprincipalkey || sambalmpassword || sambantpassword || passwordhistory")(version 3.0;acl "permission:Change a user password";allow (write) groupdn = "ldap:///cn=Change a user password,cn=permissions,cn=pbac,$SUFFIX";)',
+                '(targetattr = "userPassword || krbPrincipalKey || sambaLMPassword || sambaNTPassword || passwordHistory")(version 3.0; acl "Windows PassSync service can write passwords"; allow (write) userdn="ldap:///uid=passsync,cn=sysaccounts,cn=etc,$SUFFIX";)',
             ],
             'default_privileges': {
                 'User Administrators',
                 'Modify Users and Reset passwords',
+                'PassSync Service',
             },
         },
         'System: Manage User SSH Public Keys': {
@@ -446,6 +448,16 @@ class user(LDAPObject):
                 'homedirectory', 'loginshell',
             },
         },
+        'System: Read User NT Attributes': {
+            'ipapermbindruletype': 'permission',
+            'ipapermright': {'read', 'search', 'compare'},
+            'ipapermdefaultattr': {
+                'ntuserdomainid', 'ntuniqueid', 'ntuseracctexpires',
+                'ntusercodepage', 'ntuserdeleteaccount', 'ntuserlastlogoff',
+                'ntuserlastlogon',
+            },
+            'default_privileges': {'PassSync Service'},
+        },
     }
 
     label = _('Users')

ipaserver/install/plugins/Makefile.am

@@ -14,6 +14,7 @@ app_PYTHON = 			\
 	update_referint.py	\
 	ca_renewal_master.py	\
 	update_uniqueness.py	\
+	update_passsync.py	\
 	$(NULL)
 
 EXTRA_DIST =			\

ipaserver/install/plugins/update_passsync.py

@@ -0,0 +1,78 @@
+#
+# Copyright (C) 2014  FreeIPA Contributors see COPYING for license
+#
+
+from ipaserver.install.plugins import MIDDLE, LAST
+from ipaserver.install.plugins.baseupdate import PreUpdate, PostUpdate
+from ipalib import api, errors
+from ipapython.dn import DN
+from ipapython.ipa_log_manager import root_logger
+from ipaserver.install import sysupgrade
+
+class update_passync_privilege_check(PreUpdate):
+    order = MIDDLE
+
+    def execute(self, **options):
+        update_done = sysupgrade.get_upgrade_state('winsync', 'passsync_privilege_updated')
+        if update_done:
+            root_logger.debug("PassSync privilege update pre-check not needed")
+            return False, False, []
+
+        root_logger.debug("Check if there is existing PassSync privilege")
+
+        passsync_privilege_dn = DN(('cn','PassSync Service'),
+                self.api.env.container_privilege,
+                self.api.env.basedn)
+
+        ldap = self.obj.backend
+        try:
+            ldap.get_entry(passsync_privilege_dn, [''])
+        except errors.NotFound:
+            root_logger.debug("PassSync privilege not found, this is a new update")
+            sysupgrade.set_upgrade_state('winsync', 'passsync_privilege_updated', False)
+        else:
+            root_logger.debug("PassSync privilege found, skip updating PassSync")
+            sysupgrade.set_upgrade_state('winsync', 'passsync_privilege_updated', True)
+
+        return False, False, []
+
+api.register(update_passync_privilege_check)
+
+class update_passync_privilege_update(PostUpdate):
+    """
+        Add PassSync user as a member of PassSync privilege, if it exists
+    """
+
+    order = LAST
+
+    def execute(self, **options):
+        update_done = sysupgrade.get_upgrade_state('winsync', 'passsync_privilege_updated')
+        if update_done:
+            root_logger.debug("PassSync privilege update not needed")
+            return False, False, []
+
+        root_logger.debug("Add PassSync user as a member of PassSync privilege")
+        ldap = self.obj.backend
+        passsync_dn = DN(('uid','passsync'), ('cn', 'sysaccounts'), ('cn', 'etc'),
+            api.env.basedn)
+        passsync_privilege_dn = DN(('cn','PassSync Service'),
+                self.api.env.container_privilege,
+                self.api.env.basedn)
+
+        try:
+            entry = ldap.get_entry(passsync_dn, [''])
+        except errors.NotFound:
+            root_logger.debug("PassSync user not found, no update needed")
+            sysupgrade.set_upgrade_state('winsync', 'passsync_privilege_updated', True)
+            return False, False, []
+        else:
+            root_logger.debug("PassSync user found, do update")
+
+        update = {'dn': passsync_privilege_dn,
+                  'updates': ["add:member:'%s'" % passsync_dn]}
+        updates = {passsync_privilege_dn: update}
+
+        sysupgrade.set_upgrade_state('winsync', 'passsync_privilege_updated', True)
+        return (False, True, [updates])
+
+api.register(update_passync_privilege_update)

ipaserver/install/replication.py

@@ -528,39 +528,43 @@ class ReplicationManager(object):
         print "The user for the Windows PassSync service is %s" % pass_dn
         try:
             conn.get_entry(pass_dn)
-            print "Windows PassSync entry exists, not resetting password"
+            print "Windows PassSync system account exists, not resetting password"
-            return
         except errors.NotFound:
-            pass
+            # The user doesn't exist, add it
+            print "Adding Windows PassSync system account"
+            entry = conn.make_entry(
+                pass_dn,
+                objectclass=["account", "simplesecurityobject"],
+                uid=["passsync"],
+                userPassword=[password],
+            )
+            conn.add_entry(entry)
 
-        # The user doesn't exist, add it
+        # Add the user to the list of users allowed to bypass password policy
-        entry = conn.make_entry(
-            pass_dn,
-            objectclass=["account", "simplesecurityobject"],
-            uid=["passsync"],
-            userPassword=[password],
-        )
-        conn.add_entry(entry)
-
-        # Add it to the list of users allowed to bypass password policy
         extop_dn = DN(('cn', 'ipa_pwd_extop'), ('cn', 'plugins'), ('cn', 'config'))
         entry = conn.get_entry(extop_dn)
-        pass_mgrs = entry.get('passSyncManagersDNs')
+        pass_mgrs = entry.get('passSyncManagersDNs', [])
-        if not pass_mgrs:
-            pass_mgrs = []
-        if not isinstance(pass_mgrs, list):
-            pass_mgrs = [pass_mgrs]
         pass_mgrs.append(pass_dn)
         mod = [(ldap.MOD_REPLACE, 'passSyncManagersDNs', pass_mgrs)]
-        conn.modify_s(extop_dn, mod)
-
-        # And finally grant it permission to write passwords
-        mod = [(ldap.MOD_ADD, 'aci',
-            ['(targetattr = "userPassword || krbPrincipalKey || sambaLMPassword || sambaNTPassword || passwordHistory")(version 3.0; acl "Windows PassSync service can write passwords"; allow (write) userdn="ldap:///%s";)' % pass_dn])]
         try:
-            conn.modify_s(self.suffix, mod)
+            conn.modify_s(extop_dn, mod)
         except ldap.TYPE_OR_VALUE_EXISTS:
-            root_logger.debug("passsync aci already exists in suffix %s on %s" % (self.suffix, conn.host))
+            root_logger.debug("Plugin '%s' already '%s' in passSyncManagersDNs",
+                    extop_dn, pass_dn)
+
+        # And finally add it is a member of PassSync privilege to allow
+        # displaying user NT attributes and reset passwords
+        passsync_privilege_dn = DN(('cn','PassSync Service'),
+                api.env.container_privilege,
+                api.env.basedn)
+        members = entry.get('member', [])
+        members.append(pass_dn)
+        mod = [(ldap.MOD_REPLACE, 'member', members)]
+        try:
+            conn.modify_s(passsync_privilege_dn, mod)
+        except ldap.TYPE_OR_VALUE_EXISTS:
+            root_logger.debug("PassSync service '%s' already have '%s' as member",
+                    passsync_privilege_dn, pass_dn)
 
     def setup_winsync_agmt(self, entry, win_subtree=None):
         if win_subtree is None: