Limit allowed characters in a netgroup name to alpha, digit, -, _ and .

Apply this to hostgroup names as well since they can be linked.

https://fedorahosted.org/freeipa/ticket/2221

ipalib/plugins/hostgroup.py

@@ -20,6 +20,7 @@
 
 from ipalib.plugins.baseldap import *
 from ipalib import api, Int, _, ngettext, errors
+from ipalib.plugins.netgroup import NETGROUP_PATTERN, NETGROUP_PATTERN_ERRMSG
 from ipalib.dn import DN
 
 __doc__ = _("""
@@ -76,6 +77,8 @@ class hostgroup(LDAPObject):
 
     takes_params = (
         Str('cn',
+            pattern=NETGROUP_PATTERN,
+            pattern_errmsg=NETGROUP_PATTERN_ERRMSG,
             cli_name='hostgroup_name',
             label=_('Host-group'),
             doc=_('Name of host-group'),

ipalib/plugins/netgroup.py

@@ -49,6 +49,10 @@ EXAMPLES:
    ipa netgroup-del admins
 """)
 
+
+NETGROUP_PATTERN='^[a-zA-Z0-9_.][a-zA-Z0-9_.-]+$'
+NETGROUP_PATTERN_ERRMSG='may only include letters, numbers, _, -, and .'
+
 output_params = (
         Str('memberuser_user?',
             label='Member User',
@@ -101,6 +105,8 @@ class netgroup(LDAPObject):
 
     takes_params = (
         Str('cn',
+            pattern=NETGROUP_PATTERN,
+            pattern_errmsg=NETGROUP_PATTERN_ERRMSG,
             cli_name='name',
             label=_('Netgroup name'),
             primary_key=True,