hooks/security.py
author Alexandre Fayolle <alexandre.fayolle@logilab.fr>
Tue, 06 Apr 2010 19:46:55 +0200
branchstable
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merge
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"""Security hooks: check permissions to add/delete/update entities according to
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the user connected to a session
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:organization: Logilab
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from cubicweb import Unauthorized
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from cubicweb.selectors import objectify_selector, lltrace
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from cubicweb.server import BEFORE_ADD_RELATIONS, ON_COMMIT_ADD_RELATIONS, hook
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def check_entity_attributes(session, entity, editedattrs=None):
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    eid = entity.eid
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    eschema = entity.e_schema
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    # .skip_security_attributes is there to bypass security for attributes
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    # set by hooks by modifying the entity's dictionnary
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    dontcheck = entity.skip_security_attributes
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    if editedattrs is None:
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        try:
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            editedattrs = entity.edited_attributes
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        except AttributeError:
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            editedattrs = entity # XXX unexpected
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    for attr in editedattrs:
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        if attr in dontcheck:
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            continue
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        rdef = eschema.rdef(attr)
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        if rdef.final: # non final relation are checked by other hooks
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            # add/delete should be equivalent (XXX: unify them into 'update' ?)
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            rdef.check_perm(session, 'update', eid=eid)
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    # don't update dontcheck until everything went fine: see usage in
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    # after_update_entity, where if we got an Unauthorized at hook time, we will
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    # retry and commit time
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    dontcheck |= frozenset(editedattrs)
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class _CheckEntityPermissionOp(hook.LateOperation):
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    def precommit_event(self):
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        #print 'CheckEntityPermissionOp', self.session.user, self.entity, self.action
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        self.entity.check_perm(self.action)
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        check_entity_attributes(self.session, self.entity, self.editedattrs)
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    def commit_event(self):
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        pass
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class _CheckRelationPermissionOp(hook.LateOperation):
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    def precommit_event(self):
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        rdef = self.rschema.rdef(self.session.describe(self.eidfrom)[0],
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                                 self.session.describe(self.eidto)[0])
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        rdef.check_perm(self.session, self.action,
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                        fromeid=self.eidfrom, toeid=self.eidto)
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    def commit_event(self):
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        pass
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@objectify_selector
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@lltrace
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def write_security_enabled(cls, req, **kwargs):
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    if req is None or not req.write_security:
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        return 0
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    return 1
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class SecurityHook(hook.Hook):
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    __abstract__ = True
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    category = 'security'
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    __select__ = hook.Hook.__select__ & write_security_enabled()
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class AfterAddEntitySecurityHook(SecurityHook):
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    __regid__ = 'securityafteraddentity'
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    events = ('after_add_entity',)
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    def __call__(self):
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        _CheckEntityPermissionOp(self._cw, entity=self.entity,
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                                 editedattrs=tuple(self.entity.edited_attributes),
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                                 action='add')
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class AfterUpdateEntitySecurityHook(SecurityHook):
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    __regid__ = 'securityafterupdateentity'
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    events = ('after_update_entity',)
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    def __call__(self):
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        try:
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            # check user has permission right now, if not retry at commit time
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            self.entity.check_perm('update')
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            check_entity_attributes(self._cw, self.entity)
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        except Unauthorized:
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            self.entity.clear_local_perm_cache('update')
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            # save back editedattrs in case the entity is reedited later in the
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            # same transaction, which will lead to edited_attributes being
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            # overwritten
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            _CheckEntityPermissionOp(self._cw, entity=self.entity,
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                                     editedattrs=tuple(self.entity.edited_attributes),
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                                     action='update')
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class BeforeDelEntitySecurityHook(SecurityHook):
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    __regid__ = 'securitybeforedelentity'
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    events = ('before_delete_entity',)
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    def __call__(self):
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        self.entity.check_perm('delete')
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class BeforeAddRelationSecurityHook(SecurityHook):
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    __regid__ = 'securitybeforeaddrelation'
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    events = ('before_add_relation',)
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    def __call__(self):
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        if self.rtype in BEFORE_ADD_RELATIONS:
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            nocheck = self._cw.transaction_data.get('skip-security', ())
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            if (self.eidfrom, self.rtype, self.eidto) in nocheck:
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                return
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            rschema = self._cw.repo.schema[self.rtype]
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            rdef = rschema.rdef(self._cw.describe(self.eidfrom)[0],
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                                self._cw.describe(self.eidto)[0])
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            rdef.check_perm(self._cw, 'add', fromeid=self.eidfrom, toeid=self.eidto)
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class AfterAddRelationSecurityHook(SecurityHook):
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    __regid__ = 'securityafteraddrelation'
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    events = ('after_add_relation',)
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    def __call__(self):
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        if not self.rtype in BEFORE_ADD_RELATIONS:
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            nocheck = self._cw.transaction_data.get('skip-security', ())
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            if (self.eidfrom, self.rtype, self.eidto) in nocheck:
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                return
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            rschema = self._cw.repo.schema[self.rtype]
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            if self.rtype in ON_COMMIT_ADD_RELATIONS:
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                _CheckRelationPermissionOp(self._cw, action='add',
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                                           rschema=rschema,
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                                           eidfrom=self.eidfrom,
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                                           eidto=self.eidto)
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            else:
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                rdef = rschema.rdef(self._cw.describe(self.eidfrom)[0],
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                                    self._cw.describe(self.eidto)[0])
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                rdef.check_perm(self._cw, 'add', fromeid=self.eidfrom, toeid=self.eidto)
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class BeforeDeleteRelationSecurityHook(SecurityHook):
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    __regid__ = 'securitybeforedelrelation'
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    events = ('before_delete_relation',)
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    def __call__(self):
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        nocheck = self._cw.transaction_data.get('skip-security', ())
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        if (self.eidfrom, self.rtype, self.eidto) in nocheck:
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            return
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        rschema = self._cw.repo.schema[self.rtype]
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        rdef = rschema.rdef(self._cw.describe(self.eidfrom)[0],
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                            self._cw.describe(self.eidto)[0])
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        rdef.check_perm(self._cw, 'delete', fromeid=self.eidfrom, toeid=self.eidto)
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