+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
class Link < ArvadosModel
include HasUuid
include KindAndEtag
include CommonApiTemplate
- serialize :properties, Hash
- before_create :permission_to_attach_to_objects
- before_update :permission_to_attach_to_objects
- after_update :maybe_invalidate_permissions_cache
- after_create :maybe_invalidate_permissions_cache
- after_destroy :maybe_invalidate_permissions_cache
+
+ # Posgresql JSONB columns should NOT be declared as serialized, Rails 5
+ # already know how to properly treat them.
+ attribute :properties, :jsonbHash, default: {}
+
validate :name_links_are_obsolete
+ validate :permission_to_attach_to_objects
+ before_update :restrict_alter_permissions
+ before_update :apply_max_overlapping_permissions
+ before_create :apply_max_overlapping_permissions
+ after_update :delete_overlapping_permissions
+ after_update :call_update_permissions, :if => Proc.new { @need_update_permissions }
+ after_create :call_update_permissions, :if => Proc.new { @need_update_permissions }
+ before_destroy :clear_permissions
+ after_destroy :delete_overlapping_permissions
+ after_destroy :check_permissions
+ before_save :check_need_update_permissions
api_accessible :user, extend: :common do |t|
t.add :tail_uuid
t.add :properties
end
+ PermLevel = {
+ 'can_read' => 0,
+ 'can_write' => 1,
+ 'can_manage' => 2,
+ }
+
+ def apply_max_overlapping_permissions
+ return if self.link_class != 'permission' || !PermLevel[self.name]
+ Link.
+ lock. # select ... for update
+ where(link_class: 'permission',
+ tail_uuid: self.tail_uuid,
+ head_uuid: self.head_uuid,
+ name: PermLevel.keys).
+ where('uuid <> ?', self.uuid).each do |other|
+ if PermLevel[other.name] > PermLevel[self.name]
+ self.name = other.name
+ end
+ end
+ end
+
+ def delete_overlapping_permissions
+ return if self.link_class != 'permission'
+ redundant = nil
+ if PermLevel[self.name]
+ redundant = Link.
+ lock. # select ... for update
+ where(link_class: 'permission',
+ tail_uuid: self.tail_uuid,
+ head_uuid: self.head_uuid,
+ name: PermLevel.keys).
+ where('uuid <> ?', self.uuid)
+ elsif self.name == 'can_login' &&
+ self.properties.respond_to?(:has_key?) &&
+ self.properties.has_key?('username')
+ redundant = Link.
+ lock. # select ... for update
+ where(link_class: 'permission',
+ tail_uuid: self.tail_uuid,
+ head_uuid: self.head_uuid,
+ name: 'can_login').
+ where('properties @> ?', SafeJSON.dump({'username' => self.properties['username']})).
+ where('uuid <> ?', self.uuid)
+ end
+ if redundant
+ redundant.each do |link|
+ link.clear_permissions
+ end
+ redundant.delete_all
+ end
+ end
+
def head_kind
if k = ArvadosModel::resource_class_for_uuid(head_uuid)
k.kind
protected
+ def check_readable_uuid attr, attr_value
+ if attr == 'tail_uuid' &&
+ !attr_value.nil? &&
+ self.link_class == 'permission' &&
+ attr_value[0..4] != Rails.configuration.ClusterID &&
+ ApiClientAuthorization.remote_host(uuid_prefix: attr_value[0..4]) &&
+ ArvadosModel::resource_class_for_uuid(attr_value) == User
+ # Permission link tail is a remote user (the user permissions
+ # are being granted to), so bypass the standard check that a
+ # referenced object uuid is readable by current user.
+ #
+ # We could do a call to the remote cluster to check if the user
+ # in tail_uuid exists. This would detect copy-and-paste errors,
+ # but add another way for the request to fail, and I don't think
+ # it would improve security. It doesn't seem to be worth the
+ # complexity tradeoff.
+ true
+ else
+ super
+ end
+ end
+
def permission_to_attach_to_objects
# Anonymous users cannot write links
return false if !current_user
# All users can write links that don't affect permissions
return true if self.link_class != 'permission'
+ if PERM_LEVEL[self.name].nil?
+ errors.add(:name, "is invalid permission, must be one of 'can_read', 'can_write', 'can_manage', 'can_login'")
+ return false
+ end
+
+ rsc_class = ArvadosModel::resource_class_for_uuid tail_uuid
+ if rsc_class == Group
+ tail_obj = Group.find_by_uuid(tail_uuid)
+ if tail_obj.nil?
+ errors.add(:tail_uuid, "does not exist")
+ return false
+ end
+ if tail_obj.group_class != "role"
+ errors.add(:tail_uuid, "must be a user or role, was group with group_class #{tail_obj.group_class}")
+ return false
+ end
+ elsif rsc_class != User
+ errors.add(:tail_uuid, "must be a user or role")
+ return false
+ end
+
# Administrators can grant permissions
return true if current_user.is_admin
- # All users can grant permissions on objects they own or can manage
head_obj = ArvadosModel.find_by_uuid(head_uuid)
+
+ if head_obj.nil?
+ errors.add(:head_uuid, "does not exist")
+ return false
+ end
+
+ # No permission links can be pointed to past collection versions
+ if head_obj.is_a?(Collection) && head_obj.current_version_uuid != head_uuid
+ errors.add(:head_uuid, "cannot point to a past version of a collection")
+ return false
+ end
+
+ # All users can grant permissions on objects they own or can manage
return true if current_user.can?(manage: head_obj)
# Default = deny.
false
end
- def maybe_invalidate_permissions_cache
+ def restrict_alter_permissions
+ return true if self.link_class != 'permission' && self.link_class_was != 'permission'
+
+ return true if current_user.andand.uuid == system_user.uuid
+
+ if link_class_changed? || tail_uuid_changed? || head_uuid_changed?
+ raise "Can only alter permission link level"
+ end
+ end
+
+ PERM_LEVEL = {
+ 'can_read' => 1,
+ 'can_login' => 1,
+ 'can_write' => 2,
+ 'can_manage' => 3,
+ }
+
+ def check_need_update_permissions
+ @need_update_permissions = self.link_class == 'permission' && (name != name_was || new_record?)
+ end
+
+ def call_update_permissions
+ update_permissions tail_uuid, head_uuid, PERM_LEVEL[name], self.uuid
+ current_user.forget_cached_group_perms
+ end
+
+ def clear_permissions
if self.link_class == 'permission'
- # Clearing the entire permissions cache can generate many
- # unnecessary queries if many active users are not affected by
- # this change. In such cases it would be better to search cached
- # permissions for head_uuid and tail_uuid, and invalidate the
- # cache for only those users. (This would require a browseable
- # cache.)
- User.invalidate_permissions_cache db_current_time.to_i
+ update_permissions tail_uuid, head_uuid, REVOKE_PERM, self.uuid
+ current_user.forget_cached_group_perms
+ end
+ end
+
+ def check_permissions
+ if self.link_class == 'permission'
+ check_permissions_against_full_refresh
end
end
super
end
end
-
end
projects / arvados.git / blobdiff