Coverage for ipalib/plugins/group : 81%

# Authors: 

#   Rob Crittenden <rcritten@redhat.com> 

#   Pavel Zuna <pzuna@redhat.com> 

# 

# Copyright (C) 2009  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, either version 3 of the License, or 

# (at your option) any later version. 

# 

# 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, see <http://www.gnu.org/licenses/>. 

from ipalib import api 

from ipalib import Int, Str 

from ipalib.plugins.baseldap import * 

from ipalib import _, ngettext 

if api.env.in_server and api.env.context in ['lite', 'server']: 

    try: 

        import ipaserver.dcerpc 

        _dcerpc_bindings_installed = True 

    except ImportError: 

        _dcerpc_bindings_installed = False 

__doc__ = _(""" 

Groups of users 

Manage groups of users. By default, new groups are POSIX groups. You 

can add the --nonposix option to the group-add command to mark a new group 

as non-POSIX. You can use the --posix argument with the group-mod command 

to convert a non-POSIX group into a POSIX group. POSIX groups cannot be 

converted to non-POSIX groups. 

Every group must have a description. 

POSIX groups must have a Group ID (GID) number. Changing a GID is 

supported but can have an impact on your file permissions. It is not necessary 

to supply a GID when creating a group. IPA will generate one automatically 

if it is not provided. 

EXAMPLES: 

Add a new group: 

   ipa group-add --desc='local administrators' localadmins 

Add a new non-POSIX group: 

   ipa group-add --nonposix --desc='remote administrators' remoteadmins 

Convert a non-POSIX group to posix: 

   ipa group-mod --posix remoteadmins 

Add a new POSIX group with a specific Group ID number: 

   ipa group-add --gid=500 --desc='unix admins' unixadmins 

Add a new POSIX group and let IPA assign a Group ID number: 

   ipa group-add --desc='printer admins' printeradmins 

Remove a group: 

   ipa group-del unixadmins 

To add the "remoteadmins" group to the "localadmins" group: 

   ipa group-add-member --groups=remoteadmins localadmins 

Add a list of users to the "localadmins" group: 

   ipa group-add-member --users=test1,test2 localadmins 

Remove a user from the "localadmins" group: 

   ipa group-remove-member --users=test2 localadmins 

Display information about a named group. 

   ipa group-show localadmins 

External group membership is designed to allow users from trusted domains 

to be mapped to local POSIX groups in order to actually use IPA resources. 

External members should be added to groups that specifically created as 

external and non-POSIX. Such group later should be included into one of POSIX 

groups. 

An external group member is currently a Security Identifier as defined by 

the trusted domain. 

Example: 

1. Make note of the trusted domain security identifier 

   domainsid = `ipa trust-show <ad.domain> | grep Identifier | cut -d: -f2` 

2. Create group for the trusted domain admins' mapping and their local POSIX group: 

   ipa group-add --desc='<ad.domain> admins external map' ad_admins_external --external 

   ipa group-add --desc='<ad.domain> admins' ad_admins 

3. Add security identifier of Domain Admins of the <ad.domain> to the ad_admins_external 

   group (security identifier of <ad.domain SID>-513 is Domain Admins group): 

   ipa group-add-member ad_admins_external --external ${domainsid}-513 

4. Allow members of ad_admins_external group to be associated with ad_admins POSIX group: 

   ipa group-add-member ad_admins --groups ad_admins_external 

""") 

PROTECTED_GROUPS = (u'admins', u'trust admins', u'default smb group') 

class group(LDAPObject): 

    """ 

    Group object. 

    """ 

    container_dn = api.env.container_group 

    object_name = _('group') 

    object_name_plural = _('groups') 

    object_class = ['ipausergroup'] 

    object_class_config = 'ipagroupobjectclasses' 

    possible_objectclasses = ['posixGroup', 'mepManagedEntry', 'ipaExternalGroup'] 

    search_attributes_config = 'ipagroupsearchfields' 

    default_attributes = [ 

        'cn', 'description', 'gidnumber', 'member', 'memberof', 

        'memberindirect', 'memberofindirect', 'ipaexternalmember', 

    ] 

    uuid_attribute = 'ipauniqueid' 

    attribute_members = { 

        'member': ['user', 'group'], 

        'memberof': ['group', 'netgroup', 'role', 'hbacrule', 'sudorule'], 

        'memberindirect': ['user', 'group'], 

        'memberofindirect': ['group', 'netgroup', 'role', 'hbacrule', 

        'sudorule'], 

    } 

    rdn_is_primary_key = True 

    label = _('User Groups') 

    label_singular = _('User Group') 

    takes_params = ( 

        Str('cn', 

            pattern='^[a-zA-Z0-9_.][a-zA-Z0-9_.-]{0,252}[a-zA-Z0-9_.$-]?$', 

            pattern_errmsg='may only include letters, numbers, _, -, . and $', 

            maxlength=255, 

            cli_name='group_name', 

            label=_('Group name'), 

            primary_key=True, 

            normalizer=lambda value: value.lower(), 

        ), 

        Str('description', 

            cli_name='desc', 

            label=_('Description'), 

            doc=_('Group description'), 

        ), 

        Int('gidnumber?', 

            cli_name='gid', 

            label=_('GID'), 

            doc=_('GID (use this option to set it manually)'), 

            minvalue=1, 

        ), 

    ) 

api.register(group) 

ipaexternalmember_param = Str('ipaexternalmember*', 

            cli_name='external', 

            label=_('External member'), 

            doc=_('comma-separated SIDs of members of a trusted domain'), 

            csv=True, 

            flags=['no_create', 'no_update', 'no_search'], 

        ) 

class group_add(LDAPCreate): 

    __doc__ = _('Create a new group.') 

    msg_summary = _('Added group "%(value)s"') 

    takes_options = LDAPCreate.takes_options + ( 

        Flag('nonposix', 

             cli_name='nonposix', 

             doc=_('Create as a non-POSIX group'), 

             default=False, 

        ), 

        Flag('external', 

             cli_name='external', 

             doc=_('Allow adding external non-IPA members from trusted domains'), 

             default=False, 

        ), 

    ) 

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options): 

        # As both 'external' and 'nonposix' options have default= set for 

        # them, they will always be present in options dict, thus we can 

        # safely reference the values 

        assert isinstance(dn, DN) 

        if options['external']: 

            entry_attrs['objectclass'].append('ipaexternalgroup') 

            if 'gidnumber' in options: 

                raise errors.RequirementError(name='gid') 

        elif not options['nonposix']: 

            entry_attrs['objectclass'].append('posixgroup') 

            if not 'gidnumber' in options: 

                entry_attrs['gidnumber'] = 999 

        return dn 

api.register(group_add) 

class group_del(LDAPDelete): 

    __doc__ = _('Delete group.') 

    msg_summary = _('Deleted group "%(value)s"') 

    def pre_callback(self, ldap, dn, *keys, **options): 

        assert isinstance(dn, DN) 

        config = ldap.get_ipa_config()[1] 

        def_primary_group = config.get('ipadefaultprimarygroup', '') 

        def_primary_group_dn = group_dn = self.obj.get_dn(def_primary_group) 

        if dn == def_primary_group_dn: 

            raise errors.DefaultGroupError() 

        group_attrs = self.obj.methods.show( 

            self.obj.get_primary_key_from_dn(dn), all=True 

        )['result'] 

        if keys[0] in PROTECTED_GROUPS: 

            raise errors.ProtectedEntryError(label=_(u'group'), key=keys[0], 

                reason=_(u'privileged group')) 

        if 'mepmanagedby' in group_attrs: 

            raise errors.ManagedGroupError() 

        return dn 

    def post_callback(self, ldap, dn, *keys, **options): 

        assert isinstance(dn, DN) 

        try: 

            api.Command['pwpolicy_del'](keys[-1]) 

        except errors.NotFound: 

            pass 

        return True 

api.register(group_del) 

class group_mod(LDAPUpdate): 

    __doc__ = _('Modify a group.') 

    msg_summary = _('Modified group "%(value)s"') 

    takes_options = LDAPUpdate.takes_options + ( 

        Flag('posix', 

             cli_name='posix', 

             doc=_('change to a POSIX group'), 

        ), 

        Flag('external', 

             cli_name='external', 

             doc=_('change to support external non-IPA members from trusted domains'), 

             default=False, 

        ), 

    ) 

    def pre_callback(self, ldap, dn, entry_attrs, *keys, **options): 

        assert isinstance(dn, DN) 

        is_protected_group = keys[-1] in PROTECTED_GROUPS 

        if 'rename' in options: 

            if is_protected_group: 

                raise errors.ProtectedEntryError(label=u'group', key=keys[-1], 

                    reason=u'Cannot be renamed') 

        if ('posix' in options and options['posix']) or 'gidnumber' in options: 

            (dn, old_entry_attrs) = ldap.get_entry(dn, ['objectclass']) 

            if 'ipaexternalgroup' in old_entry_attrs['objectclass']: 

                raise errors.ExternalGroupViolation() 

            if 'posixgroup' in old_entry_attrs['objectclass']: 

                if options['posix']: 

                    raise errors.AlreadyPosixGroup() 

            else: 

                old_entry_attrs['objectclass'].append('posixgroup') 

                entry_attrs['objectclass'] = old_entry_attrs['objectclass'] 

                if not 'gidnumber' in options: 

                    entry_attrs['gidnumber'] = 999 

        if options['external']: 

            if is_protected_group: 

                raise errors.ProtectedEntryError(label=u'group', key=keys[-1], 

                    reason=u'Cannot support external non-IPA members') 

            (dn, old_entry_attrs) = ldap.get_entry(dn, ['objectclass']) 

            if 'posixgroup' in old_entry_attrs['objectclass']: 

                raise errors.PosixGroupViolation() 

            if 'ipaexternalgroup' in old_entry_attrs['objectclass']: 

                raise errors.AlreadyExternalGroup() 

            else: 

                old_entry_attrs['objectclass'].append('ipaexternalgroup') 

                entry_attrs['objectclass'] = old_entry_attrs['objectclass'] 

        # Can't check for this in a validator because we lack context 

        if 'gidnumber' in options and options['gidnumber'] is None: 

            raise errors.RequirementError(name='gid') 

        return dn 

    def exc_callback(self, keys, options, exc, call_func, *call_args, **call_kwargs): 

        # Check again for GID requirement in case someone tried to clear it 

        # using --setattr. 

        if call_func.func_name == 'update_entry': 

            if isinstance(exc, errors.ObjectclassViolation): 

                if 'gidNumber' in exc.message and 'posixGroup' in exc.message: 

                    raise errors.RequirementError(name='gid') 

        raise exc 

api.register(group_mod) 

class group_find(LDAPSearch): 

    __doc__ = _('Search for groups.') 

    member_attributes = ['member', 'memberof'] 

    msg_summary = ngettext( 

        '%(count)d group matched', '%(count)d groups matched', 0 

    ) 

    takes_options = LDAPSearch.takes_options + ( 

        Flag('private', 

            cli_name='private', 

            doc=_('search for private groups'), 

        ), 

    ) 

    def pre_callback(self, ldap, filter, attrs_list, base_dn, scope, *args, **options): 

        assert isinstance(base_dn, DN) 

        # if looking for private groups, we need to create a new search filter, 

        # because private groups have different object classes 

        if options['private']: 

            # filter based on options, oflt 

            search_kw = self.args_options_2_entry(**options) 

            search_kw['objectclass'] = ['posixGroup', 'mepManagedEntry'] 

            oflt = ldap.make_filter(search_kw, rules=ldap.MATCH_ALL) 

            # filter based on 'criteria' argument 

            search_kw = {} 

            config = ldap.get_ipa_config()[1] 

            attrs = config.get(self.obj.search_attributes_config, []) 

            if len(attrs) == 1 and isinstance(attrs[0], basestring): 

                search_attrs = attrs[0].split(',') 

                for a in search_attrs: 

                    search_kw[a] = args[-1] 

            cflt = ldap.make_filter(search_kw, exact=False) 

            filter = ldap.combine_filters((oflt, cflt), rules=ldap.MATCH_ALL) 

        return (filter, base_dn, scope) 

api.register(group_find) 

class group_show(LDAPRetrieve): 

    __doc__ = _('Display information about a named group.') 

    has_output_params = LDAPRetrieve.has_output_params + (ipaexternalmember_param,) 

api.register(group_show) 

class group_add_member(LDAPAddMember): 

    __doc__ = _('Add members to a group.') 

    takes_options = (ipaexternalmember_param,) 

    def post_callback(self, ldap, completed, failed, dn, entry_attrs, *keys, **options): 

        assert isinstance(dn, DN) 

        result = (completed, dn) 

        if 'ipaexternalmember' in options: 

            if not _dcerpc_bindings_installed: 

                raise errors.NotFound(reason=_('Cannot perform external member validation without ' 

                                      'Samba 4 support installed. Make sure you have installed ' 

                                      'server-trust-ad sub-package of IPA on the server')) 

            domain_validator = ipaserver.dcerpc.DomainValidator(self.api) 

            if not domain_validator.is_configured(): 

                raise errors.NotFound(reason=_('Cannot perform join operation without own domain configured. ' 

                                      'Make sure you have run ipa-adtrust-install on the IPA server first')) 

            sids = [] 

            failed_sids = [] 

            for sid in options['ipaexternalmember']: 

                if domain_validator.is_trusted_sid_valid(sid): 

                    sids.append(sid) 

                else: 

                    failed_sids.append((sid, 'Not a trusted domain SID')) 

            if len(sids) == 0: 

                raise errors.ValidationError(name=_('external member'), 

                                             error=_('values are not recognized as valid SIDs from trusted domain')) 

            restore = [] 

            if 'member' in failed and 'group' in failed['member']: 

                restore = failed['member']['group'] 

            failed['member']['group'] = list((id,id) for id in sids) 

            result = add_external_post_callback('member', 'group', 'ipaexternalmember', 

                                                ldap, completed, failed, dn, entry_attrs, 

                                                keys, options, external_callback_normalize=False) 

            failed['member']['group'] = restore + failed_sids 

        return result 

api.register(group_add_member) 

class group_remove_member(LDAPRemoveMember): 

    __doc__ = _('Remove members from a group.') 

    takes_options = (ipaexternalmember_param,) 

    def pre_callback(self, ldap, dn, found, not_found, *keys, **options): 

        assert isinstance(dn, DN) 

        if keys[0] in PROTECTED_GROUPS: 

            protected_group_name = keys[0] 

            result = api.Command.group_show(protected_group_name) 

            users_left = set(result['result'].get('member_user', [])) 

            users_deleted = set(options['user']) 

            if users_left.issubset(users_deleted): 

                raise errors.LastMemberError(key=sorted(users_deleted)[0], 

                    label=_(u'group'), container=protected_group_name) 

        return dn 

    def post_callback(self, ldap, completed, failed, dn, entry_attrs, *keys, **options): 

        assert isinstance(dn, DN) 

        result = (completed, dn) 

        if 'ipaexternalmember' in options: 

            sids = options['ipaexternalmember'] 

            restore = list() 

            if 'member' in failed and 'group' in failed['member']: 

                restore = failed['member']['group'] 

            failed['member']['group'] = list((id,id) for id in sids) 

            result = remove_external_post_callback('member', 'group', 'ipaexternalmember', 

                                                ldap, completed, failed, dn, entry_attrs, 

                                                keys, options) 

            failed['member']['group'] = restore 

        return result 

api.register(group_remove_member) 

class group_detach(LDAPQuery): 

    __doc__ = _('Detach a managed group from a user.') 

    has_output = output.standard_value 

    msg_summary = _('Detached group "%(value)s" from user "%(value)s"') 

    def execute(self, *keys, **options): 

        """ 

        This requires updating both the user and the group. We first need to 

        verify that both the user and group can be updated, then we go 

        about our work. We don't want a situation where only the user or 

        group can be modified and we're left in a bad state. 

        """ 

        ldap = self.obj.backend 

        group_dn = self.obj.get_dn(*keys, **options) 

        user_dn = self.api.Object['user'].get_dn(*keys) 

        try: 

            (user_dn, user_attrs) = ldap.get_entry(user_dn) 

        except errors.NotFound: 

            self.obj.handle_not_found(*keys) 

        is_managed = self.obj.has_objectclass(user_attrs['objectclass'], 'mepmanagedentry') 

        if (not ldap.can_write(user_dn, "objectclass") or 

            not (ldap.can_write(user_dn, "mepManagedEntry")) and is_managed): 

            raise errors.ACIError(info=_('not allowed to modify user entries')) 

        (group_dn, group_attrs) = ldap.get_entry(group_dn) 

        is_managed = self.obj.has_objectclass(group_attrs['objectclass'], 'mepmanagedby') 

        if (not ldap.can_write(group_dn, "objectclass") or 

            not (ldap.can_write(group_dn, "mepManagedBy")) and is_managed): 

            raise errors.ACIError(info=_('not allowed to modify group entries')) 

        objectclasses = user_attrs['objectclass'] 

        try: 

            i = objectclasses.index('mepOriginEntry') 

            del objectclasses[i] 

            update_attrs = {'objectclass': objectclasses, 'mepManagedEntry': None} 

            ldap.update_entry(user_dn, update_attrs) 

        except ValueError: 

            # Somehow the user isn't managed, let it pass for now. We'll 

            # let the group throw "Not managed". 

            pass 

        (group_dn, group_attrs) = ldap.get_entry(group_dn) 

        objectclasses = group_attrs['objectclass'] 

        try: 

            i = objectclasses.index('mepManagedEntry') 

        except ValueError: 

            # this should never happen 

            raise errors.NotFound(reason=_('Not a managed group')) 

        del objectclasses[i] 

        # Make sure the resulting group has the default group objectclasses 

        config = ldap.get_ipa_config()[1] 

        def_objectclass = config.get( 

            self.obj.object_class_config, objectclasses 

        ) 

        objectclasses = list(set(def_objectclass + objectclasses)) 

        update_attrs = {'objectclass': objectclasses, 'mepManagedBy': None} 

        ldap.update_entry(group_dn, update_attrs) 

        return dict( 

            result=True, 

            value=keys[0], 

        ) 

api.register(group_detach)