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vnc_perms.py
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vnc_perms.py
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#
# Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
#
import sys
import cfgm_common
from cfgm_common import has_role
from cfgm_common import jsonutils as json
import string
import uuid
from provision_defaults import *
from cfgm_common.exceptions import *
from pysandesh.gen_py.sandesh.ttypes import SandeshLevel
class VncPermissions(object):
mode_str = {PERMS_R: 'R', PERMS_W: 'W', PERMS_X: 'X',
PERMS_WX: 'WX', PERMS_RX: 'RX', PERMS_RW: 'RW', PERMS_RWX: 'RWX'}
mode_str2 = {PERMS_R: 'read', PERMS_W: 'write', PERMS_X: 'link',
PERMS_WX: 'write,link', PERMS_RX: 'read,link', PERMS_RW: 'read,write',
PERMS_RWX: 'read,write,link'}
def __init__(self, server_mgr, args):
self._server_mgr = server_mgr
# end __init__
@property
def cloud_admin_role(self):
return self._server_mgr.cloud_admin_role
@property
def global_read_only_role(self):
return self._server_mgr.global_read_only_role
@property
def _auth_needed(self):
return self._server_mgr.is_auth_needed()
# end
@property
def _rbac(self):
return self._server_mgr.is_rbac_enabled()
# end
def validate_user_visible_perm(self, id_perms, is_admin):
return id_perms.get('user_visible', True) is not False or is_admin
# end
def validate_perms(self, request, uuid, mode=PERMS_R, id_perms=None):
# retrieve object and permissions
if not id_perms:
try:
id_perms = self._server_mgr._db_conn.uuid_to_obj_perms(uuid)
except NoIdError:
return (True, 'RWX')
err_msg = (403, 'Permission Denied')
user, roles = self.get_user_roles(request)
is_admin = has_role(self.cloud_admin_role, roles)
if is_admin:
return (True, 'RWX')
if has_role(self.global_read_only_role, roles) and mode == PERMS_R:
return (True, 'R')
owner = id_perms['permissions']['owner']
group = id_perms['permissions']['group']
perms = id_perms['permissions']['owner_access'] << 6 | \
id_perms['permissions']['group_access'] << 3 | \
id_perms['permissions']['other_access']
# check perms
mask = 0
if user == owner:
mask |= 0700
if group in roles:
mask |= 0070
if mask == 0: # neither user nor group
mask = 07
mode_mask = mode | mode << 3 | mode << 6
ok = (mask & perms & mode_mask)
granted = ok & 07 | (ok >> 3) & 07 | (ok >> 6) & 07
if ok and mode == PERMS_W:
ok = self.validate_user_visible_perm(id_perms, is_admin)
return (True, self.mode_str[granted]) if ok else (False, err_msg)
# end validate_perms
def validate_perms_rbac(self, request, obj_uuid, mode=PERMS_R, obj_owner_for_delete=None, perms2=None):
err_msg = (403, 'Permission Denied')
# retrieve object and permissions
if not perms2:
try:
config = self._server_mgr._db_conn.uuid_to_obj_dict(obj_uuid)
perms2 = config.get('prop:perms2', config.get("perms2"))
except NoIdError:
return (True, '')
user, roles = self.get_user_roles(request)
is_admin = has_role(self.cloud_admin_role, roles)
if is_admin:
return (True, 'RWX')
if has_role(self.global_read_only_role, roles) and mode == PERMS_R:
return (True, 'R')
env = request.headers.environ
tenant = env.get('HTTP_X_PROJECT_ID')
tenant_name = env.get('HTTP_X_PROJECT_NAME', '*')
if tenant is None:
msg = "rbac: Unable to find tenant id in headers"
self._server_mgr.config_log(msg, level=SandeshLevel.SYS_DEBUG)
tenant = ''
tenant = tenant.replace('-','')
# grant access if shared with domain
domain = env.get('HTTP_X_DOMAIN_ID') or env.get('HTTP_X_DOMAIN_NAME') or \
env.get('HTTP_X_USER_DOMAIN_ID') or 'default-domain'
try:
domain = str(uuid.UUID(domain))
except ValueError, TypeError:
if domain == 'default':
domain = 'default-domain'
domain = self._server_mgr._db_conn.fq_name_to_uuid('domain', [domain])
if domain:
domain = domain.replace('-','')
owner = perms2['owner'].replace('-','')
perms = perms2['owner_access'] << 6
perms |= perms2['global_access']
# build perms
mask = 07
if ((tenant == owner)):
mask |= 0700
share = perms2['share']
tenants = [item['tenant'] for item in share]
for item in share:
# item['tenant'] => [share-type, uuid]
# allow access if domain or project from token matches configured sharing information
(share_type, share_uuid) = cfgm_common.utils.shareinfo_from_perms2_tenant(item['tenant'])
share_uuid = share_uuid.replace('-','')
if ((share_type == 'tenant' and tenant == share_uuid) or (share_type == 'domain' and domain == share_uuid)):
perms = perms | item['tenant_access'] << 3
mask |= 0070
break
mode_mask = mode | mode << 3 | mode << 6
ok = (mask & perms & mode_mask)
if (ok and obj_owner_for_delete):
obj_owner_for_delete = obj_owner_for_delete.replace('-','')
ok = (tenant == obj_owner_for_delete)
granted = ok & 07 | (ok >> 3) & 07 | (ok >> 6) & 07
msg = 'rbac: %s (%s:%s) admin=%s, mode=%03o mask=%03o perms=%03o, \
(usr=%s(%s)/own=%s/sh=%s)' \
% ('+++' if ok else '---', self.mode_str[mode], obj_uuid,
'yes' if is_admin else 'no', mode_mask, mask, perms,
tenant, tenant_name, owner, tenants)
self._server_mgr.config_log(msg, level=SandeshLevel.SYS_DEBUG)
if not ok:
msg = "rbac: %s doesn't have %s permission in tenant %s" % (user, self.mode_str2[mode], owner)
self._server_mgr.config_log(msg, level=SandeshLevel.SYS_NOTICE)
return (True, self.mode_str[granted]) if ok else (False, err_msg)
# end validate_perms
# retreive user/role from incoming request
def get_user_roles(self, request):
user = []
env = request.headers.environ
if 'HTTP_X_USER' in env:
user = env['HTTP_X_USER']
roles = []
if 'HTTP_X_ROLE' in env:
roles = env['HTTP_X_ROLE'].split(',')
return (user, roles)
# end get_user_roles
# set user/role in object dict from incoming request
# called from post handler when object is created
# TODO dsetia - no longer applicable to new RBAC permissions
def set_user_role(self, request, obj_dict):
(user, roles) = self.get_user_roles(request)
if user:
obj_dict['id_perms']['permissions']['owner'] = user
if roles:
obj_dict['id_perms']['permissions']['group'] = roles[0]
# end set_user_role
def check_perms_write(self, request, id):
app = request.environ['bottle.app']
if app.config.local_auth or self._server_mgr.is_auth_disabled():
return (True, '')
if self._rbac:
return self.validate_perms_rbac(request, id, PERMS_W)
elif self._auth_needed:
return self.validate_perms(request, id, PERMS_W)
else:
return (True, '')
# end check_perms_write
def check_perms_read(self, request, id, obj_dict={}):
app = request.environ['bottle.app']
if app.config.local_auth or self._server_mgr.is_auth_disabled():
return (True, '')
if self._rbac:
return self.validate_perms_rbac(request, id, PERMS_R,
perms2=obj_dict.get("perms2"))
elif self._auth_needed:
return self.validate_perms(request, id, PERMS_R,
id_perms=obj_dict.get("id_perms"))
else:
return (True, '')
# end check_perms_read
def check_perms_link(self, request, id):
app = request.environ['bottle.app']
if app.config.local_auth or self._server_mgr.is_auth_disabled():
return (True, '')
if self._rbac:
return self.validate_perms_rbac(request, id, PERMS_X)
elif self._auth_needed:
return self.validate_perms(request, id, PERMS_X)
else:
return (True, '')
# end check_perms_link
def check_perms_delete(self, request, obj_type, obj_uuid, parent_uuid):
app = request.environ['bottle.app']
if app.config.local_auth or self._server_mgr.is_auth_disabled():
return (True, '')
if self._rbac:
# delete only allowed for owner
try:
ok, result = self._server_mgr._db_conn.dbe_read(
obj_type, obj_uuid, obj_fields=['perms2'])
except NoIdError as e:
return False, (404, str(e))
if not ok:
return False, (500, result)
obj_dict = result
obj_owner = obj_dict['perms2']['owner']
return self.validate_perms_rbac(request, parent_uuid, PERMS_W,
obj_owner_for_delete=obj_owner)
elif self._auth_needed:
return self.validate_perms(request, parent_uuid, PERMS_W)
else:
return (True, '')
# end check_perms_write
# This API sends perms instead of error code & message
def obj_perms(self, request, id):
app = request.environ['bottle.app']
if app.config.local_auth or self._server_mgr.is_auth_disabled():
return 'RWX'
if self._rbac:
ok, perms = self.validate_perms_rbac(request, id, PERMS_RWX)
elif self._auth_needed:
ok, perms = self.validate_perms(request, id, PERMS_RWX)
else:
return 'RWX'
return perms if ok else ''
# end obj_perms