Warning

This document is for an old release of Galaxy. You can alternatively view this page in the latest release if it exists or view the top of the latest release's documentation.

Source code for galaxy.managers.rbac_secured

import logging

import galaxy.exceptions
from galaxy import (
    model,
    security
)
from galaxy.managers import users

log = logging.getLogger(__name__)


class RBACPermissionFailedException(galaxy.exceptions.InsufficientPermissionsException):
    pass


class RBACPermission:
    """
    Base class for wrangling/controlling the permissions ORM models (Permissions, Roles)
    that control which users can perform certain actions on their associated models
    (Libraries, Datasets).
    """

    permissions_class: type
    permission_failed_error_class = RBACPermissionFailedException

    def __init__(self, app):
        self.app = app
        self.user_manager = users.UserManager(app)

    def session(self):
        return self.app.model.context

    # TODO: implement group
    # TODO: how does admin play into this?
    def is_permitted(self, item, user, trans=None):
        raise NotImplementedError("abstract parent class")

    def error_unless_permitted(self, item, user, trans=None):
        if not self.is_permitted(item, user, trans=trans):
            error_info = dict(model_class=item.__class__, id=getattr(item, 'id', None))
            raise self.permission_failed_error_class(**error_info)

    def grant(self, item, user, flush=True):
        raise NotImplementedError("abstract parent class")

    def revoke(self, item, user, flush=True):
        raise NotImplementedError("abstract parent class")

    def _role_is_permitted(self, item, role):
        raise NotImplementedError("abstract parent class")

    def _error_unless_role_permitted(self, item, role):
        if not self._role_is_permitted(item, role):
            error_info = dict(model_class=item.__class__, id=getattr(item, 'id', None))
            raise self.permission_failed_error_class(**error_info)

    def _grant_role(self, item, role, flush=True):
        raise NotImplementedError("abstract parent class")

    def _revoke_role(self, item, role, flush=True):
        raise NotImplementedError("abstract parent class")


class DatasetRBACPermission(RBACPermission):
    """
    Base class for the manage and access RBAC permissions used by dataset security.

    The DatasetPermissions used by the RBAC agent are associations between a Dataset
    and a single Role.

    DatasetPermissions are typed (but not polymorphic themselves) by a string 'action'.
    There are two types:

    - manage permissions : can a role manage the permissions on a dataset
    - access : can a role read/look at/copy a dataset
    """
    permissions_class = model.DatasetPermissions
    action_name = None

    # ---- double secrect probation
    def __assert_action(self):
        if not self.action_name:
            raise NotImplementedError("abstract parent class" + " needs action_name")

    # ---- interface
    def by_dataset(self, dataset):
        self.__assert_action()
        all_permissions = self._all_types_by_dataset(dataset)
        return list(filter(lambda p: p.action == self.action_name, all_permissions))

    def by_roles(self, dataset, roles):
        permissions = self.by_dataset(dataset)
        return list(filter(lambda p: p.role in roles, permissions))

    def by_role(self, dataset, role):
        permissions = self.by_dataset(dataset)
        found = list(filter(lambda p: p.role == role, permissions))
        if not found:
            return None
        if len(found) > 1:
            raise galaxy.exceptions.InconsistentDatabase(dataset=dataset.id, role=role.id)
        return found[0]

    def set(self, dataset, roles, flush=True):
        # NOTE: this removes all previous permissions of this type
        self.clear(dataset, flush=False)
        permissions = []
        for role in roles:
            permissions.append(self._create(dataset, role, flush=False))
        if flush:
            self.session().flush()
        return permissions

    def clear(self, dataset, flush=True):
        permissions = self.by_dataset(dataset)
        return self._delete(permissions, flush=flush)

    # ---- private
    def _create(self, dataset, role, flush=True):
        permission = self.permissions_class(self.action_name, dataset, role)
        self.session().add(permission)
        if flush:
            self.session().flush()
        return permission

    def _roles(self, dataset):
        return [permission.role for permission in self.by_dataset(dataset)]

    def _all_types_by_dataset(self, dataset):
        return dataset.actions

    # as a general rule, DatasetPermissions are considered disposable
    #   and there is no reason to update the models

    # TODO: list?
    def _delete(self, permissions, flush=True):
        for permission in permissions:
            if permission in self.session().new:
                self.session().expunge(permission)
            else:
                self.session().delete(permission)
        if flush:
            self.session().flush()

    def _revoke_role(self, dataset, role, flush=True):
        role_permissions = self.by_roles(dataset, [role])
        return self._delete(role_permissions, flush=flush)


def iterable_has_all(iterable, has_these):
    for item in has_these:
        if item not in iterable:
            return False
    return True


class DatasetManagePermissionFailedException(RBACPermissionFailedException):
    pass


class ManageDatasetRBACPermission(DatasetRBACPermission):
    """
    A class that controls the dataset permissions that control
    who can manage that dataset's permissions.

    When checking permissions for a user, if any of the user's roles
    have permission on the dataset
    """
    # TODO: We may also be able to infer/record the dataset 'owner' as well.
    action_name = security.RBACAgent.permitted_actions.get('DATASET_MANAGE_PERMISSIONS').action
    permission_failed_error_class = DatasetManagePermissionFailedException

    # ---- interface
    def is_permitted(self, dataset, user, trans=None):
        if trans and trans.user_is_admin:
            return True

        # anonymous users cannot manage permissions on datasets
        if self.user_manager.is_anonymous(user):
            return False
        # admin is always permitted
        # TODO: could probably move this into RBACPermission and call that first
        if self.user_manager.is_admin(user):
            return True
        for role in user.all_roles():
            if self._role_is_permitted(dataset, role):
                return True
        return False

    def grant(self, dataset, user, flush=True):
        private_role = self._user_private_role(user)
        return self._grant_role(dataset, private_role, flush=flush)

    def revoke(self, dataset, user, flush=True):
        private_role = self._user_private_role(user)
        return self._revoke_role(dataset, private_role, flush=flush)

    # ---- private
    def _role_is_permitted(self, dataset, role):
        return role in self._roles(dataset)

    def _user_private_role(self, user):
        # error with 401 if no user
        self.user_manager.error_if_anonymous(user)
        return self.user_manager.private_role(user)

    def _grant_role(self, dataset, role, flush=True):
        existing = self.by_role(dataset, role)
        if existing:
            return existing
        return self._create(dataset, role, flush=flush)

    def _revoke_role(self, dataset, role, flush=True):
        permission = self.by_roles(dataset, [role])
        return self._delete([permission], flush=flush)


class DatasetAccessPermissionFailedException(RBACPermissionFailedException):
    pass


class AccessDatasetRBACPermission(DatasetRBACPermission):
    """
    A class to manage access permissions on a dataset.

    An user must have all the Roles of all the access permissions associated
    with a dataset in order to access it.
    """
    action_name = security.RBACAgent.permitted_actions.get('DATASET_ACCESS').action
    permission_failed_error_class = DatasetAccessPermissionFailedException

    # ---- interface
    def is_permitted(self, dataset, user, trans=None):
        if trans and trans.user_is_admin:
            return True

        current_roles = self._roles(dataset)
        # NOTE: that because of short circuiting this allows
        #   anonymous access to public datasets
        return (self._is_public_based_on_roles(current_roles)
                or self.user_manager.is_admin(user)  # admin is always permitted
                or self._user_has_all_roles(user, current_roles))

    def grant(self, item, user):
        pass
        # not so easy
        # need to check for a sharing role
        # then add the new user to it

    def revoke(self, item, user):
        pass
        # not so easy

    # TODO: these are a lil off message
    def is_public(self, dataset):
        current_roles = self._roles(dataset)
        return self._is_public_based_on_roles(current_roles)

    def set_private(self, dataset, user, flush=True):
        private_role = self.user_manager.private_role(user)
        return self.set(dataset, [private_role], flush=flush)

    # ---- private
    def _is_public_based_on_roles(self, roles):
        return len(roles) == 0

    def _user_has_all_roles(self, user, roles):
        user_roles = []
        if not self.user_manager.is_anonymous(user):
            user_roles = user.all_roles()
        return iterable_has_all(user_roles, roles)

    def _role_is_permitted(self, dataset, role):
        current_roles = self._roles(dataset)
        return (self._is_public_based_on_roles(current_roles)
                # if there's only one role and this is it, let em in
                or ((len(current_roles) == 1) and (role == current_roles[0])))