Malicious user can stole public session key and use
it by sending request from it's own scope. To prevent
this each session token is signed and signature private
key must be corresponded with owner id in token. Therefore
malicious node cannot impersonate request without private
key to sign token.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
Classifier fetches public key of the request owner
and owner itself. Extended ACL check should rely on
this public key, because it might be extracted from
session token.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
Owner of the request is stored in session token most of the times.
Put request contains session token in the object body, so we have
to fetch it from there.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
Basic ACL checker gets request field via getters that are
NPE-free, therefore we don't need to worry about function
invocations on nil structures.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
ACL has to classify request senders by roles:
- owner of the container,
- request from container or inner ring node,
- any other request.
According to this roles ACL checker use different
bits of basic ACL to grant or deny access.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
