Internet DRAFT - draft-zhang-gap-analysis
draft-zhang-gap-analysis
Network Working Group S. Hares
INTERNET-DRAFT Huawei
Intended Status: Informational D. Zhang
H. Moskowitz
HTT Consulting
H.Rafiee
Rozanak
Expires: January 6, 2016 July 6, 2015
Analysis of Existing Work for I2NSF
<draft-zhang-gap-analysis-06.txt>
Abstract
This document analyzes the status of the arts in industries and the
existing IETF work/protocols that are relevant to I2NSF. existing
IETF work/protocols that are relevant to the Interface to Network
Security Function (I2NSF). The I2NSF focus is to define data models
and interfaces in order to control and monitor the physical and
virtual aspects of network security functions.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
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documents as Internet-Drafts. The list of current Internet-Drafts is
at http://datatracker.ietf.org/drafts/current.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 6, 2016.
Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved. This document is subject to
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. What is I2NSF . . . . . . . . . . . . . . . . . . . . . . 4
1.2. Structure of this Document . . . . . . . . . . . . . . . 5
1.3. Terms and Definitions . . . . . . . . . . . . . . . . . . 5
1.3.1. Requirements Terminology . . . . . . . . . . . . . . 5
1.3.2. Definitions . . . . . . . . . . . . . . . . . . . . . 5
2. IETF Gap analysis . . . . . . . . . . . . . . . . . . . . . . 7
2.1. Traffic Filters . . . . . . . . . . . . . . . . . . . . 7
2.1.1. Overview . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1.1. Data Flow Filters in NETMOD and I2RS . . . . . . 7
2.1.1.2. I2NSF Gap analysis . . . . . . . . . . . . . . . 9
2.1.2. Middle-box Filters . . . . . . . . . . . . . . . . . 9
2.1.2.1. Midcom . . . . . . . . . . . . . . . . . . . . . 9
2.1.3. Security Work . . . . . . . . . . . . . . . . . . . . 10
2.1.3.1. Overview . . . . . . . . . . . . . . . . . . . . 10
2.1.3.2. Security Work and Filters . . . . . . . . . . . 11
2.1.3.3. I2NSF interaction . . . . . . . . . . . . . . . 11
2.1.3.4. Benefits from the Interaction . . . . . . . . . 12
3. ETSI NFV . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1. ETSI Overview . . . . . . . . . . . . . . . . . . . . . 13
3.2. I2NSF Gap Analysis . . . . . . . . . . . . . . . . . . . 14
4. OPNFV . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1. OPNFV Moon Project . . . . . . . . . . . . . . . . . . . 15
4.2. Gap Analysis for OPNFV Moon Project . . . . . . . . . . 16
5. OpenStack Security Firewall . . . . . . . . . . . . . . . . 16
5.1. Overview of API for Security Group . . . . . . . . . . . 17
5.2. Overview of Firewalls as a Service . . . . . . . . . . . 17
5.3. I2NSF Gap analysis . . . . . . . . . . . . . . . . . . . 18
6. CSA Secure Cloud . . . . . . . . . . . . . . . . . . . . . . 18
6.1. CSA Overview . . . . . . . . . . . . . . . . . . . . . . 18
6.1.1. CSA Security as a Service(SaaS) . . . . . . . . . . 19
6.1.2. Identity Access Management (IAM) . . . . . . . . . . 20
6.1.3. Data Loss Prevention (DLP) . . . . . . . . . . . . . 20
6.1.4. Web security(Web)) . . . . . . . . . . . . . . . . . 21
6.1.5. Email Security (email)) . . . . . . . . . . . . . . 22
6.1.6. Security Assessment . . . . . . . . . . . . . . . . 24
6.1.7. Intrusion Detection . . . . . . . . . . . . . . . . 24
6.1.8. Security Information and Event Management(SEIM) . . 25
6.1.9. Encryption . . . . . . . . . . . . . . . . . . . . . 26
6.1.10. Business Continuity and Disaster Recovery (BC/DR) . 27
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6.1.11. Network Security Devices . . . . . . . . . . . . . 28
6.2. I2NSF Gap Analysis . . . . . . . . . . . . . . . . . . . 29
7. In-depth Review of IETF protocols . . . . . . . . . . . . . 29
7.1. NETCONF and RESTCONF . . . . . . . . . . . . . . . . . . 29
7.2. I2RS Protocol . . . . . . . . . . . . . . . . . . . . . 30
7.3. NETMOD Yang modules . . . . . . . . . . . . . . . . . . 31
7.4. COPS . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.5. PCP . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.6. NSIS - Next steps in Signalling . . . . . . . . . . . . 33
8. Security Considerations . . . . . . . . . . . . . . . . . . . 34
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 34
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.1. Normative . . . . . . . . . . . . . . . . . . . . . . . . 34
10.2. Informative . . . . . . . . . . . . . . . . . . . . . . . 34
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 42
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1. Introduction
This documents provides a gap analysis for I2NSF.
1.1. What is I2NSF
The Network Security Function (NSF) in a network ensures integrity,
confidentiality and availability of network communications, detects
unwanted activity, and blocks out or at least mitigates the effects
of unwanted activity. NSF devices are provided and consumed in
increasingly diverse environments. For example, users of NSFs could
consume network security services offered on multiple security
products hosted one or more service provider,their own enterprises,
or a combination of the two.
The lack of standard interfaces to control and monitor the behaviour
of NSFs, makes it virtually impossible for security service providers
to automate service offerings that utilize different security
functions from multiple vendors.
The Interface to NSF devices (I2NSF) work proposes to standardize a
set of software interfaces and data modules to control and monitor
the physical and virtual NSFs. Since different security vendors
support different features and functions, the I2NSF will focus on the
flow-based NSFs that provide treatment to packets or flows such found
in IPS/IDS devices, web filtering devices, flow filtering devices,
deep packet inspection devices, pattern matching inspection devices,
and re-mediation devices.
There are two layers of interfaces envisioned in the I2NSF approach:
o The I2NSF Capability Layer specifies how to control and monitor
NSFs at a functional implementation level. This the focus for this
phase of the I2NSF Work.
o The I2NSF Service Layer defines how the security policies of
clients may be expressed and monitored. The Service Layer is out of
scope for this phase of I2NSF's work.
For the I2NSF capability layer, the I2NSF work proposes an
interoperable protocol that passes NSF provisioning rules and
orchestration information between I2NSF client on a network manager
and I2NSF agent on an NSF device. It is envisioned that clients of
the I2NSF interfaces include management applications, service
orchestration systems, network controllers, or user applications that
may solicit network security resources.
The I2NSF work to define this protocol includes the following work:
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o defining an informational model that defines the concepts for
standardizing the control and monitoring of NSFs,
o defining a set of Yang data models from the information model that
identifies the data that must be passed,
o creating a capability registry (an IANA registry) that identifies
the characteristics and behaviours of NSFs in vendor-neutral
vocabulary without requiring the NSFs to be standardized.
o examining existing secure communication mechanisms to identify the
appropriate ones for carrying the data that provisions and monitors
information between the NSFs and their management entity (or
entities).
1.2. Structure of this Document
This document provides a analysis of the gaps in the state of art in
the following industry forums:
IETF working groups (section 2)
ETSI Network Functions Virtualization Industry Specification Group
(ETSI NFV ISG), (section 3)
OPNFV Open Source Group (section 4)
Open Stack - Firewall as a service (OpenStack Firewall FaaS)
(section 5)
(http://docs.openstack.org/admin-guide-cloud/content/install_neutron-fwaas-agent.html)
Cloud Security Alliance Security (CSA)as a Service (section 6)
(https://cloudsecurityalliance.org/research/secaas/#_overview)
In-Depth Review of Some IETF Protocols (section 7)
1.3. Terms and Definitions
1.3.1. Requirements Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119, BCP 14
[RFC2119] and indicate requirement levels for compliant CoAP.
1.3.2. Definitions
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Cloud DC: A data center that is not on premises of enterprises, but
has compute/storage resources that can be requested or purchased by
the enterprises. The enterprise is actually getting a virtual data
center. The Cloud Security Alliance (CSA)
(http://cloudsecurityalliance.org) focus on adding security to this
environment. A specific research topic is security as a service
within the cloud data center.
o Cloud-based security functions: Network Security Function (NSF)
hosted and managed by service providers or different administrative
entity.
o DC: Data Center
o Domain: The term Domain in this draft has the following different
connotations in different scenarios:
* Client--Provider relationship, i.e. client requesting some
network security functions from its provider;
* Domain A - Domain B relationship, i.e. one operator domain
requesting some network security functions from another operator
domain; or
* Applications -- Network relationship, i.e. an application (e.g.
cluster of servers) requesting some functions from network, etc.
The domain context is important because it indicates the interactions
the security is focused on.
o NSF - Network Security function
o I2NSF agent - a piece of software in a device that implements a
network security function which receives provisioning information and
requests for operational data (monitoring data) across the I2NSF
protocol from an I2NSF client.
o I2NSF client - A security client software that utilizes the I2NSF
protocol to read, write or change the provisioning network security
device via software interface using the I2NSF protocol (denoted as
I2RS Agent)
o I2NSF Management System - I2NSF client operates within an network
management system which serves as a collections and distribution
point for security provisioning and filter data. This management
system is denoted as I2NS management system in this document.
o Virtual Security Function: a security function that can be
requested by one domain but may be owned or managed by another
domain.
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2. IETF Gap analysis
The IETF gap analysis first examines the IETF mechanisms which have
been developed to secure the IP traffic flows through a network.
Traffic filters have been defined by IETF specifications at the
access points, the middle-boxes, or the routing systems. Protocols
have been defined to carry provisioning and filtering traffic between
a management system and an IP system (router or host system). Current
security work (SACM working group (WG), MILE WG, and DOTS WG) is
providing correlation of events monitored with the policy set by
filters. This section provides a review the filter work, protocols,
and security correlation for monitors.
2.1. Traffic Filters
2.1.1. Overview
The earliest filters defined by IETF were access filters which
controlled the acceptance of IP packet data flows. Additional policy
filters were created as part of the following protocols:
o COPS protocol [RFC2748] for controlling access to networks,
o Next steps in Signalling (NSIS) work (architecture: [RFC4080]
protocol: [RFC5973]), and
o the Port Control Protocol (PCP) to enables IPv4 to IPv6 flexible
address and port mapping for NATs and Firewalls,
Today NETMOD and I2RS Working groups are specifying additional
filters in Yang modules to be used as part of the NETCONF or I2RS
enhancement of NETCONF/RESTCONF.
The routing filtering is outside the scope of the flow filtering, but
flow filtering may be impacted by route filtering. An initial model
for the routing policy is in [I-D.shaikh-rtgwg-policy-model]
This section provides an overview of the flow filtering as an
introduction to the I2NSF GAP analysis. Additional detail on NETCONF,
NETMOD, I2RS, PCP, and NSIS is available in the Detailed I2NSF
analysis.
2.1.1.1. Data Flow Filters in NETMOD and I2RS
The current work on expanding these filters is focused oncombining a
configuration and monitoring protocol with Yang data models.
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[I-D.ietf-netmod-acl-model] provides a set of access lists filters
which can permit or deny traffic flow based on headers at the MAC, IP
layer, and Transport layer. The configuration and monitoring
protocols which can pass the filters are: NETCONF protocol [RFC6241],
RESTCONF [I-D.ietf-netconf-restconf], and the I2RS protocol. The
NETCONF and RESTCONF protocols install these filters into forwarding
tables. The I2RS protocol uses the ACLs as part of the filters
installed in an ephemeral protocol-independent filter-based RIB
[I-D.kini-i2rs-fb-rib-info-model] which controls the flow of traffic
on interfaces specifically controlled by the I2RS filter-based FIB.
netconf
+---------------+ / \ +---------------+
| Device: ACLs |-- / \---|Device: ACLS |
| I2RS FB RIB | | I2RS FIB RIB |
|routing policy | | routing policy|
| | | |
===|===============|=============|===============|=
+---------------+ data flow +---------------+
Figure 1
The I2RS protocol is a programmatic interface to the routing system.
At this time, the I2RS is targeted to be extensions to the NETCONF/
RESTCONF protocols to allow the NETCONF/RESTCONF protocol to support
a highly programmatic interface with high bandwidth of data, highly
reliable notifications, and ephemeral state (see
[I-D.ietf-i2rs-architecture]). Please see the background section on
I2RS for additional details on the requirements for this extension to
the NETCONF/RESTCONF protocol suite.
The vocabulary set in [I-D.ietf-netmod-acl-model] is limited, so
additional protocol independent filters were written for the I2RS
Filter-Based RIBs in [I-D.hares-i2rs-bnp-eca-data-model], and
protocol specific filters for SFC
[I-D.dunbar-i2rs-discover-traffic-rules].
One thing important to note is that NETCONF and RESTCONF manage
device layer yang models. However, as figure 2 shows, there are
multiple device level, network-wide level, and application level yang
modules. The access lists defined by the device level forwarding
table may be impacted by the routing protocols, the I2RS ephemeral
protocol independent Filter-Based FIB, or some network-wide security
issue (IPS/IDS).
+--------------------------------------------+
|Application Network Wide: Intent |
+--------------------------------------------+
|Network-wide level: L3SM L3VPN service model|
+--------------------------------------------+
|Device level: Protocol Independent: I2RS |
| RIB, Topology, Filter-Based RIB |
+--------------------------------------------+
|Device Level:Protocol Yang modules |
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| (ISIS, OSPF, BGP, EVPN, L2VPN, L3VPN, etc.)
+--------------------------------------------+
| Device level: IP and System: NETMOD Models |
| (config and oper-state), tunnels, |
| forwarding filters |
+--------------------------------------------+
Figure 2 levels of Yang modules
2.1.1.2. I2NSF Gap analysis
The gap is that none of the current work on these filters considers
all the variations of data necessary to do IPS/IDS, web-filters,
stateful flow-based filtering, security-based deep packet inspection,
or pattern matching with re-mediation. The I2RS Filter-Based RIB work
is the closest associated work, but the focus has not been on
IDS/IPS, web-filters, security-based deep packet inspection, or
pattern matching with re-mediation.
The I2RS Working group (I2RS WG) is focused on the routing system so
security expertise for these IDP/IPS, Web-filter, security-based
deep-packet inspection has not been targeted for this WG.
Another gap is there is no capability registry (an IANA registry)
that identifies the characteristics and behaviours of NSFs in vendor-
neutral vocabulary without requiring the NSFs to be standardized.
What I2NSF can use from NETCONF/RESTCONF and I2RS I2NSF should
consider using NETCONF/RESTCONF protocol and the I2RS proposed
enhancement to the NETCONF/RESTCONF protocol.
2.1.2. Middle-box Filters
2.1.2.1. Midcom
Midcom Summary: MIDCOM developed the protocols for applications to
communicate with middle boxes. However, MIDCOM have not used by the
industry for a long time. This is because there was a lot of IPR
encumbered technology and IPR was likely a bigger problem for IETF
than it is today. MIDCOM is not specific to SIP. It was very much
oriented to NAT/FW devices. SIP was just one application that needed
the functionality. MIDCOM is reservation-oriented and there was an
expectation that the primary deployment environment would be VoIP and
real-time conferencing, including SIP, H.323, and other reservation-
oriented protocols. There was an assumption that there would be some
authoritative service that would have a view into endpoint sessions
and be able to authorize (or not) resource allocation requests. In
other word, there's a trust model there that may not be applicable to
endpoint-driven requests without some sort of trusted authorization
mechanisms/tools. Therefore, there is a specific information model
applied to security devices, and security device requests, that was
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developed in the context of an SNMP MIB. There is also a two-stage
reservation model, which was specified in order to allow better
resource management.
Why I2NSF is different than Midcom
MIDCOM is different than I2NSF because its SNMP scheme doesn't work
with the virtual network security functions (vNSF) management.
MidCom RFCs:
[RFC3303] - Midcom architecture
[RFC5189] - Midcom Protocol Semantics
[RFC3304] - Midcom protocol requirements
2.1.3. Security Work
2.1.3.1. Overview
Today's NSFs in security devices can handle flow-based security by
providing treatment to packets/flows, such as IPS/IDS, Web filtering,
flow filtering, deep packet inspection, or pattern matching and re-
mediation. These flow-based security devices are managed and
provisioned by network management systems.
No standardized set of interoperable interfaces control and manage
the NSFs so that a central management system can be used across
security devices from multiple Vendors. I2NSF work plan is to
standardize a set of interfaces by which control and management of
NSFs may be invoked, operated, and monitored by:
creating an information model that defines concepts required for
standardizing the control and monitoring of NSFs, and from the
information model create data models. (The information model will be
used to get early agreement on key technical points.)
creating a capability registry (at IANA) that enables the
characteristics and behavior of NSFs to be specified using a
vendor-neutral vocabulary without requiring the NSFs themselves to be
standardized.
define the requirements for an I2NSF protocol to pass this traffic.
(Hopefully re-using existing protocols.)
The flow-filtering configuration and management must fit into the
existing security area's work plan. This section considers how the
I2NSF fits into the security area work under way in the SACM
(security automation and control), DOTS (DDoS Open Threat
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Signalling), and MILE (Management Incident Lightweight Exchange).
2.1.3.2. Security Work and Filters
In the proposed I2NSF work plan, the I2NSF security network
management system controls many NSF nodes via the I2NSF Agent. This
control of data flows is similar to the COPS example in section x.x.
+------------+
| I2NSF |
| Client |
| |
| security |
| NMS system |
+------------+
+-----+ / \ +-----+
|I2NSF|--/ \---|I2NSF|
|Agent| |Agent|
| | | |
| NSF | | NSF |
--| ----|------------|-----|-----
+-----+ data flow +-----+
Figure 2
The other security protocols work to interact within the network to
provide additional information in the following way:
o SACM [I-D.ietf-sacm-architecture] describes an architecture which
tries to determine if the end-point security policies and the reality
(denoted as security posture) align. [I-D.ietf-sacm-terminology]
defines posture as the configuration and/or status of hardware or
software on an endpoint as it pertains to an organization's security
policy. Filters can be considered on the configuration or status
pieces that needs to be monitored.
o DOTS (DDoS Open Threat Signalling) - is working on coordinating the
mitigation of DDoS attacks. A part of DDoS attach mitigation is to
provide lists of addresses to be filtered via IP header filters.
o MILE (Managed Incident LIghtweight Exchange) - is working on
creating a standardized format for incident and indicator reports,
and creating a protocol to transport this information. The incident
information MILE collects may cause changes in data-flow filters on
one or more NSFs.
2.1.3.3. I2NSF interaction
The network management system that the I2NSF client resides on may
interact with other clients or agents developed for the work ongoing
in the SACM, DOTS, and MILES working groups. This section describes
how the addition of I2NSF's ability to control and monitor NSF
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devices is compatible and synergistic with these existing efforts.
+----------+ +------+
+--------+ | security |====| DOTS |
|SACNM | | NMS | |client|---+
|consumer| |..........|\ +------+ |
+--------+==|SACM *1 | \ |
+----|repository| \ |
| |..........| +-------+ |
| | I2NSF | |MILES | |
+------|-+ | client | |client | |
|SACM | +----------+ +-----:-+ |
|Info. | / \ : |
|provider| / \ : |
+--------+ / \ : |
+-----+ / \ +-----+ : |
|I2NSF|--/ \---|I2NSF| : |
| | | | : |
| | |MILES|.: |
| | |Agent| |
| | |DOTS | |
| | |Agent|-------+
--| ----|----------------|-----|-----
+-----+ data flow +-----+
*1 - this is the SACM Controller (CR) with
its broker/proxy/repository show as
described in the SACM architecture.
Figure 3
Figure 3 provides a diagram of a system the I2NSF, SACM, DOTS and
MILES client-agent or consumer-broker-provider are deployed together.
The following are possible positive interactions these scenario might
have:
o An security network management system (NMS) can contain a SACM
repository and be connected to SACM information provider and a SACM
consumer. The I2NSF may provide one of the ways to change the
forwarding filters.
o The security NMS may also be connected to DOTS DDoS clients
managing the information and configuring the rules. The I2NSF may
provide one of the ways to change forwarding filters.
o The MILES client on a security network management system talking to
the MILES agent on the node may react to the incidents by using I2NSF
to set filters. DOTS creates black-lists, but does not have a
complete set of filters.
2.1.3.4. Benefits from the Interaction
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I2NSF's ability to provide a common interoperable and vendor neutral
interface may allow the security NMS to use a single change to change
filters. SACM provides an information model to describe end-points,
but does not link this directly to filters.
DOTS creates black-lists based on source and destination IP address,
transport port number, protocol ID, and traffic rate. Like NETMOD's,
ACLS are not sufficient for all filters or control desired by the NSF
boxes.
The incident data captured by MILES will not have enough filter
information to provide NSF devices with general services. The I2NSF
will be able to handle the MILE incident data and create alerts or
reports for other security systems.
3. ETSI NFV
3.1. ETSI Overview
Network Function Virtualization (NFV) provides the service providers
with flexibility, cost effective and agility to offer their services
to customers. One such service is the network security function which
guards the exterior of a service provider or its customers.
The flexibility and agility of NFV encourages service providers to
provide different products to address business trends in their market
to provide better service offerings to their end user. A traditional
product such as the network security function (NSF) may be broken
into multiple virtual devices each hosted from another vendor. In the
past, network security devices may have been single sourced from a
small set of vendors - but in the NFV version of NSF devices, this
reduced set of sources will not provide a competitive edge. Due to
this market shift, the network security device vendors are realizing
that the proprietary provisioning protocols and formats of data may
be a liability. Out of the NFV work has arisen a desire for a single
interoperable network security device provisioning and control
protocol.
The I2NSF will be deployed along networks using other security and
NFV technology. As section 3 described, the NFV NSF security is
deployed along side other security functions (AAA, SACM, DOTS, and
MILE devices) or deep-packet-inspection. The ETSI Network Functions
Virtualization: NFV security: Security and Trust guidance document
(ETSI NFV SEC 003 1.1.1 (2014-12)) indicates that multiple
administrative domains will deployed in carrier networks. One example
of these multiple domains is hosting of multiple tenant domains
(telecom service providers) on a single infrastructure domain
(infrastructure service) as figure 4 shows. The ETSI Inter inter-
VNFM document (aka Ve-Vnfn) between the element management system and
the Virtual network function is the equivalent of the interface
between the I2NSF client on a management system and the I2NSF agent
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on the network security feature VNF.
....................
+--: OSS/BSS :
| ....................
|
| +-------------------------+
| | |
| | ........ ........ |
| | : EMS1 : : EMS : | ETSI inter-VNFM
| | ....||... ...||... | (Ve-Vnfn)
| | || || ==========I2NSF interface
| | ....||... ...||... |
| | : VNF1 : : VNF1 : | Tenant domain
| | ....||... ...||... |
''''''''||'''''''''||''''''''''
| | ....||..... ...||...... | infrastructure
| | :virtual : :virtual : | domain
| | :computing: :computing: | with virtual
| | ........... ........... | network
| | +=====================+ ---------
| | | virtualization layer| |
| | +=====================+ |
| | ........... .......... .......... |
|====:computing: :storage : :network : |
| :hardware : :hardware: :hardware: |
| ........... .......... .......... |
| hardware resources |
+-----------------------------------+
figure 4
The ETSI proof of concept work has worked on the following security
proof of concepts:
o #16 - NFVIaas with Secure, SDN controlled WAN Gateway,
3.2. I2NSF Gap Analysis
The I2NSF will be deployed on top of virtual computing linked
together by virtual routers configured by NETCONF/RESTCONF or I2RS
which provision and monitoring the L1, L2, l3 and service pathways
through the network.
In the NFV-related productions, the current architecture does not
have a protocol to maintain an interoperability provisioning from
I2NSF client to I2NSF agent. The result is that service providers
have to manage the interoperability using private protocols. In
response to this problem, the device manufacturers and the service
providers have begun to discuss an I2NSF protocol for interoperable
passing of provisioning and filter in formation.
Open source work (such as OPNFV) provides a common code base for
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providers to start their NFV work from. However, this code base faces
the same problem. There is no defacto standard protocol.
4. OPNFV
The OPNFV (www.opnfv.org) is a carrier-grade integrated, open source
platform focused on accelerating the introduction of new Network
Function Virtualization (NFV) products and service. The OPNFV Moon
project is focused on adding the security interface for a network
management system within the Tenant NFVs and the infrastructure NFVs
(as shown in figure 4). This section provides an overview of the
OPNFV Moon project and a gap analysis between I2NSF and the OPNFV
Moon Project.
4.1. OPNFV Moon Project
The OPNFV moon project (https://wiki.opnfv.org) is a security
management system. NFV uses cloud computing technologies to
virtualize the resources and automate the control. The Moon project
is working on a security manager for the Cloud computing
infrastructure (https://wiki.opnfv.org/moon). The Moon project
proposes to provision a set of different cloud resources/services for
VNFs (Virtualized Network Functions) while managing the isolation of
VNS, protection of VNFs, and monitoring of VNS. Moon is creating a
security management system for OPNFV with security managers to
protect different layers of the NFV infrastructure. The Moon project
is choosing various security project mechanisms "a la cart" to
enforcement related security managers. A security management system
integrates mechanisms of different security aspects. This project
will first propose a security manager that specifies users' security
requirements. It will also enforce the security managers through
various mechanisms like authorization for access control, firewall
for networking, isolation for storage, logging for tractability, etc.
The Moon security manager operates a VNF security manager at the ETSI
VeVnfm level where the I2NSF protocol is targeted as figure 5 shows.
This figure also shows how the OPNFV VNF Security project mixes the
I2NSF level with the device level.
The Moon project lists the following gaps in OpenStack:
o No centralized control for compute, storage, and networking. Open
Stack uses Nova for computing and Swift for software. Each system has
a configuration file and its own security policy. This lacks the
synchronization mechanism to build a complete secure configuration
for OPNF.
o No dynamic control so that if a user obtains the token, the is no
way to obtain control over the user.
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o No customization or flexibility to allow integration into different
vendors,
o No fine grain authorization at user level. Authorization is only at
the API
Moon addresses these issues adding authorization, logging, IDS,
enforcement of network policy, and storage protection. Moon is based
on OpenStack Keystone.
Deliverable time frame: 2S 2015
....................
+--: OSS/BSS :
| ....................
|
| +-------------------------+
| | |
| | ........ ........ |
| | : EMS1 : : EMS : | ETSI inter-VNFM
| | ....||... ...||... | (Ve-Vnfn)
| | || || ==========I2NSF interface
| | ....||... ...||... | Moon VNF === Moon VNF
| | : : : : | Security Security MGR
| | : VNF1 : : VNF1 : |
| | ....||... ...||... | Tenant domain
''''''''||'''''''''||''''''''''
| | ....||..... ...||...... | infrastructure
| | :virtual : :virtual : | domain
| | :computing: :computing: | with virtual
| | ........... ........... | network
| | +=====================+ |--------
| | | virtualization layer| |
| | +=====================+
| | =============Moon VNF ===Moon VI
| | security project Security MGR
| | ........... .......... .......... |
|====:computing: :storage : :network : |
| :hardware : :hardware: :hardware: |
| ........... .......... .......... |
| hardware resources |
+-----------------------------------+
figure 5
4.2. Gap Analysis for OPNFV Moon Project
OpenStack congress does not provide vendor independent systems.
5. OpenStack Security Firewall
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OpenStack has advanced features of: a) API for managing security
groups (http://docs.openstack.org/admin-guide-cloud/content/
section_securitygroups.html) and b) firewalls as a service
(http://docs.openstack.org/admin-guide-cloud/content/
fwaas_api_abstractions.html).
This section provides an overview of this open stack work, and a gap
analysis of how I2NSF provides additional functions
5.1. Overview of API for Security Group
The security group with the security group rules provides ingress and
egress traffic filters based on port. The default group drops all
ingress traffic and allows all egress traffic. The groups with
additional filters are added to change this behaviour. To utilize the
security groups, the networking plug-in for Open Stack must implement
the security group API. The following plug-ins in OpenSTsack
currently implement this security: ML2, Open vSwitch, Linux Bridge,
NEC, and VMware NSX. In addition, the correct firewall driver must be
added to make this functional.
5.2. Overview of Firewalls as a Service
Firewall as a service is an early release of an API that allows early
adopters to test network implementations. It contains APIs with
parameters for firewall rules, firewall policies, and firewall
identifiers. The firewall rules include the following information:
o identification of rule (id, name, description)
o identification tenant rule associated with,
o links to installed firewall policy,
o IP protocol (tcp, udp, icmp, none)
o source and destination IP address
o source and destination port
o action: allow or deny traffic
o status: position and enable/disabled
The firewall policies include the following information:
o identification of the policy (id, name, description),
o identification of tenant associated with,
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o ordered list of firewall rules,
o indication if policy can be seen by tenants other than owner, and
o indication if firewall rules have been audited.
The firewall table provides the following information:
o identification of firewall (id, name, description),
o tenant associated with this firewall,
o administrative state (up/down),
o status (active, down, pending create, pending delete, pending
update, pending error)
o firewall policy ID this firewall is associated with
5.3. I2NSF Gap analysis
The OpenStack work is preliminary (security groups and firewall as a
service). This work does not allow any of the existing network
security vendors provide a management interface. Security devices
take time to be tested for functionality and their detection of
security issues. The OpenStack work provides an interesting simple
set of filters, and may in the future provide some virtual filter
service. However, at this time this open source work does not address
the single management interfaces for a variety of security devices.
I2NSF is proposing rules that will include Event-Condition-matches
(ECA) with the following matches packet based matches on L2, L3, and
L4 headers and/or specific addresses within these headers, context
based matches on schedule state and schedule, [Editor: Need more
details here.]
The I2NSF is proposing action for these ECA policies of:
basic actions of deny, permit, and mirror,
advanced actions of: IPS signature filtering and URL filtering.
6. CSA Secure Cloud
6.1. CSA Overview
The Cloud Security Alliance (CSA)(www.cloudsecurityaliance.org)
defined security as a service (SaaS) in their Security as a Service
working group (SaaS WG) during 2010-2012. The CSA SaaS group defined
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ten categories of network security
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/SecaaS_V1_0.pdf)
and provides implementation guidance for each of these ten categories
This section provides an overview of the CSA SaaS working groups
documentation and a Gap analysis for I2NSF
6.1.1. CSA Security as a Service(SaaS)
The CSA SaaS working group defined the following ten categories, and
provided implementation guidance on these categories:
1. Identity Access Management (IAM)
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_1_IAM_Implementation_Guidance.pdf)
2. Data Loss Prevention (DLP)
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_2_DLP_Implementation_Guidance.pdf)
3. Web Security (web)
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_3_Web_Security_Implementation_Guidance.pdf),
4. Email Security (email)
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_4_Email_Security_Implementation_Guidance.pdf),
5. Security Assessments
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_5_Security_Assessments_Implementation_Guidance.pdf),
6. Intrusion Management
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_6_Intrusion_Management_Implementation_Guidance.pdf),
7. Security information and Event Management
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_7_SIEM_Implementation_Guidance.pdf),
8. Encryption
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_8_Encryption_Implementation_Guidance.pdf),
9. Business Continuity and Disaster Recovery (BCDR)
https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_9_BCDR_Implementation_Guidance.pdf), and
10. Network Security
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_10_Network_Security_Implementation_Guidance.pdf).
The sections below give an overview these implementation guidances
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6.1.2. Identity Access Management (IAM)
document:
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_1_IAM_Implementation_Guidance.pdf)
The identity management systems include the following services:
o Centralized Directory Services,
o Access Management Services,
o Identity Management Services,
o Identity Federation Services,
o Role-Based Access Control Services,
o User Access Certification Services,
o Privileged User and Access Management,
o Separation of Duties Services, and
o Identity and Access Reporting Services.
The IAM device communications with the security management system
that controls the filtering of data. The CSA SaaS IAM specification
states that interoperability between IAM devices and secure access
network management systems is a a problem. This 2012 implementation
report confirms there is a gap with I2NSF
+------------+ +--------+
| IAM device | ---- SLA ------------| secure |
| | Access review | access |
| | security events | NMS |
| | access tracing | |
+---||-------+ Audit report +---||---+
|| ||
|| +------------------+ ||
========== |Filter enforcement|=====||
+------------------+
Figure 6
6.1.3. Data Loss Prevention (DLP)
Document:
(https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_2_DLP_Implementation_Guidance.pdf)
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The data loss prevention (DLP)services must address:
o origination verification,
o integrity of data,
o confidentiality and access control,
o accountability,
o avoiding false positives on detection, and
o privacy concerns.
The CSA SaaS DLP device communications require that it have the
enforcement capabilities to do the following:
alert and log data loss,
delete data on system or passing through,
filter out (block/quarantine) data,
reroute data,
encrypt data
+------------+ +--------+
| DLP device | ---- SLA ------------| secure |
| | Alert and log | access |
| | delete data | NMS |
| | filter/reroute | |
+---||-------+ encrypt data +---||---+
|| ||
|| +------------------+ ||
========== |Filter enforcement|=====||
+------------------+
Figure 7
6.1.4. Web security(Web))
Document:
https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_3_Web_Security_Implementation_Guidance.pdf
The web security services must address:
o Web 2.0/Social Media controls,
o Malware and Anti-Virus controls,
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o Data Loss Prevention controls (over Web-based services like Gmail
or Box.net),
o XSS, JavaScript and other web specific attack controls
o Web URL Filtering,
o Policy control and administrative management,
o Bandwidth management and quality of service (QoS) capability, and
o Monitoring of SSL enabled traffic.
The CSA SaaS Web services device communications require that it have
the enforcement capabilities to do the following:
alert and log malware or anti-virus data patterns,
delete data (malware and virus) passing through systems,
filter out (block/quarantine) data,
filter Web URLs,
interact with policy and network management systems,
control bandwidth and QoS of traffic, and
monitor encrypted (SSL enabled) traffic,
All of these features either require the I2NSF standardized I2NSF
client to I2NSF agent to provide multi-vendor interoperability.
+------------+ +--------+
|Web security| ---- SLA ------------| secure |
| | Alert and log | access |
| | delete data | NMS |
| | filter/reroute data | |
| | ensure bandwdith/QOS | |
| | monitor encrypted | |
| | data | |
+---||-------+ encrypt data +---||---+
|| ||
|| +------------------+ ||
========== |Filter enforcement|=====||
+------------------+
Figure 8
6.1.5. Email Security (email))
Document:
https://downloads.cloudsecurityalliance.org/initiatives/secaas/
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SecaaS_Cat_4_Email_Security_Implementation_Guidance.pdf
The CSA Document recommends that email security services must
address:
o Common electronic mail components,
o Electronic mail architecture protection,
o Common electronic mail threats,
o Peer authentication,
o Electronic mail message standards,
o Electronic mail encryption and digital signature,
o Electronic mail content inspection and filtering,
o Securing mail clients, and
o Electronic mail data protection and availability assurance
techniques
The CSA SaaS Email security services requires that it have the
enforcement capabilities to do the following:
provide the malware and spam detection and removal,
alert and provide rapid response to email threats,
identify email users and secure remote access to email,
do on-demand provisioning of email services,
filter out (block/quarantine) email data,
know where the email traffic or data is residing (to to regulatory
issues), and
be able to monitor encrypted email,
be able to encrypt email,
be able to retain email records (while abiding with privacy
concerns), and
interact with policy and network management systems.
All of these features require the I2NSF standardized I2NSF client to
I2NSF agent to provide multi-vendor interoperability.
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+------------+ +--------+
| Email | ---- SLA ------------| secure |
| security | alert/log malware | access |
| | alert/log email spam | NMS |
| | filter/reroute data | |
| | ensure bandwidth/QOS | |
| | monitor encrypted | |
| | data | |
+---||-------+ encrypt data +---||---+
|| ||
|| +------------------+ ||
========== |Filter enforcement|=====||
+------------------+
Figure 9
6.1.6. Security Assessment
Document:
https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_5_Security_Assessments_Implementation_Guidance.pdf
The CSA SaaS Security assessment indicates that assessments need to
be done on the following devices:
o hypervisor infrastructure,
o network security compliance systems,
o Servers and workstations,
o applications,
o network vulnerabilities systems,
o internal auditor and intrusion detection/prevention systems (IDS/
IPS), and
o web application systems.
All of these features require the I2NSF working group standardize the
way to pass these assessments to and from the I2NSF client on the
I2NSF management system and the I2NSF Agent.
6.1.7. Intrusion Detection
Document:
https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_6_Intrusion_Management_Implementation_Guidance.pdf)
The CSA SaaS Intrusion detection management includes intrusion
detection through: devices:
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o Network traffic inspection, behavioural analysis, and flow
analysis,
o Operating System, Virtualization Layer, and Host Process Events
monitoring,
o monitoring of Application Layer Events, and
o Correlation Techniques, and other Distributed and Cloud-Based
Capabilities
Intrusion response includes both:
o Automatic, Manual, or Hybrid Mechanisms,
o Technical, Operational, and Process Mechanisms.
The CSA SaaS recommends the intrusion security management systems
include provisioning and monitoring of all of these types of
intrusion detection (IDS) or intrusion protection devices. The
management of these systems requires also requires:
Central reporting of events and alerts,
administrator notification of intrusions,
Mapping of alerts to Cloud-Layer Tenancy,
Cloud sourcing information to prevent false positives in detection,
and
allowing for redirection of traffic to allow remote storage or
transmission to prevent local evasion.
All of these features require the I2NSF standardized I2NSF client to
I2NSF agent to provide multi-vendor interoperability.
+------------+ +--------+
| IDS/IPS | ---- Info ----------| secure |
| security | alert/log intrusion | access |
| | notify administrator | NMS |
| | Map alerts to Tenant | |
| |filter/reroute traffic| |
| | remote data storage | |
+---||-------+ +---||---+
|| ||
|| +------------------+ ||
========== |Filter enforcement|=====||
+------------------+
Figure 10
6.1.8. Security Information and Event Management(SEIM)
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Document:
https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_7_SIEM_Implementation_Guidance.pdf)
The Security Information and Event Management (SEIM) receives data
from a wide range of security systems such as Identity management
systems (IAM), data loss prevention (DLP), web security (Web), email
security (email), intrusion detection/prevision (IDS/IPS)),
encryption, disaster recovery, and network security. The SEIM
combines this data into a single streams. All the requirements for
data to/from these systems are replicated in these systems needs to
give a report to the SIEM system.
A SIEM system would be prime candidate to have a I2NSF client that
gathers data from an I2NSF Agent associated with these various types
of security systems. The CSA SaaS SIEM functionality document
suggests that one concern is to have standards that allow timely
recording and sharing of data. I2NSF can provide this.
6.1.9. Encryption
Document:
https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_8_Encryption_Implementation_Guidance.pdf
The CSA SaaS Encryption implementation guidance document considers
how one implements and manages the following security systems:
key management systems (KMS), control of keys, and key life cycle;
Shared Secret encryption (Symmetric ciphers),
No-Secret or Public Key Encryption (asymmetric ciphers),
hashing algorithms,
Digital Signature Algorithms,
Key Establishment Schemes,
Protection of Cryptographic Key Material (FIPS 140-2; 140-3),
Interoperability of Encryption Systems, Key Conferencing, Key Escrow
Systems, and others
application of Encryption for Data at rest, data in transit, and data
in use;
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PKI (including certificate revocation "CRL");
Future application of such technologies as Homomorphic encryption,
Quantum Cryptography, Identitybased Encryption, and others;
Crypto-system Integrity (How bad implementations can under mind a
crypto-system), and
Cryptographic Security Standards and Guidelines
The wide variety of encryption services require the security
management systems be able to provision, monitor, and control the
systems that are being used to encrypt data. This document indicates
in the implementation sections that the standardization of interfaces
to/from management systems are key to good key management systems,
encryption systems, and crypto-systems.
6.1.10. Business Continuity and Disaster Recovery (BC/DR)
Document:
https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_9_BCDR_Implementation_Guidance.pdf
The CSA SaaS Business Continuity and Disaster Recovery (BC/DR)
implementation guidance document considers the systems that implement
the the contingency plans and measures designed and implemented to
ensure operational resiliency in the event of any service
interruptions. BC/DR systems includes:
Business Continuity and Disaster Recovery BC/DR as a service,
including categories such as complete Disaster Recovery as a Service
(DRaaS), and subsets such as file recovery, backup and archive,
Storage as a Service including object, volume, or block storage;
old Site, Warm Site, Hot Site backup plans;
IaaS (Infrastructure as a Service), PaaS (Platform as a Service), and
SaaS (Software as a Service);
Insurance (and insurance reporting programs)
Business Partner Agents (business associate agreements);
System Replication (for high availability);
Fail-back to Live Systems mechanisms and management;
Recovery Time Objective (RTO) and Recovery Point Objective (RPO);
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Encryption (data at rest [DAR], data in motion [DIM], field level);
Realm-based Access Control;
Service-level Agreements (SLA); and ISO/IEC 24762:2008, BS25999, ISO
27031, and FINRA Rule 4370
These BC/DR systems must handle data backup and recovery, server
backup/recovery, and data center (virtual/physical) backup and
recovery. Recovery as a service (RaaS) means that the BC/DR services
are being handled by management systems outside the enterprise.
The wide variety of BC/DR requires the security management systems to
be able to communicate provisioning, monitor, and control those
systems that are being used to back-up and restore data. An
interoperable protocol that allows provision and control of data
center's data, servers, and data center management devices devices is
extremely important to this application. Recovery as a Service (SaaS)
indicates that these services need to be able to be remotely
management.
The CSA SaaS BC/BR documents indicate how important a standardized
I2NSF protocol is.
6.1.11. Network Security Devices
Document:
https://downloads.cloudsecurityalliance.org/initiatives/secaas/
SecaaS_Cat_10_Network_Security_Implementation_Guidance.pdf
The CSA SaaS Network Security implementation recommendation includes
advice on:
How to segment networks,
Network security controls,
Controlling ingress and egress controls such as Firewalls (Stateful),
Content Inspection and Control (Network-based), Intrusion Detection
System/Intrusion Prevention Systems (IDS/IPS), and Web Application
Firewalls,
Secure routing and time,
Denial of Service (DoS) and Distributed Denial of Service (DDoS)
Protection/Mitigation,
Virtual Private Network (VPN) with Multiprotocol Label Switching
(MPLS) Connectivity (over SSL), Internet Protocol Security (IPsec)
VPNs, Virtual Private LAN Service (VPLS), and Ethernet Virtual
Private Line (EVPL),
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Threat Management,
Forensic Support, and
Privileged User/Use Monitoring.
These network security systems require provisioning, monitoring, and
the ability for the security management system to subscribe to
receive logs, snapshots of capture data, and time synchronization.
This document states the following:
"It is critical to understand what monitoring APIs are available from
the CSP, and if they match risk and compliance requirements",
"Network security auditors are challenged by the need to track a
server and its identity from creation to deletion. Audit tracking is
challenging in even the most mature cloud environments, but the
challenges are greatly complicated by cloud server sprawl, the
situation where the number of cloud servers being created is growing
more quickly than a cloud environments ability to manage them."
A valid threat vector for cloud is the API access. Since a majority
of CSPs today support public API interfaces available within their
networks and likely over the Internet."
The CSA SaaS network security indicates that the I2NSF must be secure
so that the I2NSF Client-Agent protocol does not become a valid
threat vector. In additions, the need for the management protocol
like I2NSF is critical in the sprawl of Cloud environment.
6.2. I2NSF Gap Analysis
The CSA Security as a Service (SaaS) document show clearly that there
is a gap between the ability of the CSA SaaS devices to have a vendor
neutral, inoperable protocol that allow the multiple of network
security devices to communicate passing provisioning and
informational data. Each of the 10 implementation agreements points
to this as a shortage. The I2NSF yang models and protocol is needed
according to the CSA SaaS documents.
7. In-depth Review of IETF protocols
7.1. NETCONF and RESTCONF
The IETF NETCONF working group has developed the basics of the
NETCONF protocol focusing on secure configuration and querying
operational state. The NETCONF protocol [RFC6241] may be run over TLS
[RFC6639] or SSH ([RFC6242]. NETCONF can be expanded to defaults
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[RFC6243], handling events ([RFC5277] and basic notification
[RFC6470], and filtering writes/reads based on network access control
models (NACM, [RFC6536]). The NETCONF configuration must be committed
to a configuration data store (denoted as config=TRUE). Yang models
identify nodes within a configuration data store or an operational
data store using a XPath expression (document root ---to --- target
source). NETCONF uses an RPC model and provides protocol for handling
configs (get-config, edit-config, copy-config, delete- config, lock,
unlock, get) and sessions (close-session, kill- session). The NETCONF
Working Group has developed RESTCONF, which is an HTTP-based protocol
that provides a programmatic interface for accessing data defined in
YANG, using the datastores defined in NETCONF.
RESTCONF supports "two edit condition detections" - time stamp and
entity tag. RESTCONF uses a URI encoded path expressions. RESTCONF
provides operations to get remote servers options (OPTIONS), retrieve
data headers (HEAD), get data (GET), create resource/invoke operation
(POST), patch data (PATCH), delete resource (DELETE), or query. RFCs
for NETCONF
o NETCONF [RFC6242]
o NETCONF monitoring [RFC6022]
o NETCONF over SSH [RFC6242]
o NETCONF over TLS [RFC5539]
o NETCONF system notification> [RFC6470]
o NETCONF access-control (NACM) [RFC6536]
o RESTCONF [I-D.ietf-netconf-restconf]
o NETCONF-RESTCONF call home [I-D.ietf-netconf-call-home]
o RESTCONF collection protocol [I-D.ietf-netconf-restconf-collection]
o NETCONF Zero Touch Provisioning [I-D.ietf-netconf-zerotouch]
7.2. I2RS Protocol
Based on input from the NETCONF working group, the I2RS working group
decided to re-use the NETCONF or RESTCONF protocols and specify
additions to these protocols rather than create yet another protocol
(YAP).
The required extensions for the I2RS protocol are in the following
drafts:
o Ephemeral state [I-D.ietf-i2rs-ephemeral-state],
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o Publication-Subscription notifications
[I-D.ietf-i2rs-pub-sub-requirements],
o Traceability [I-D.ietf-i2rs-traceability],
o Security requirements [I-D.hares-i2rs-auth-trans]
At this time, NETCONF and RESTCONF cannot handle the ephemeral data
store proposed by I2RS, the publication and subscription
requirements, the traceability, or the security requirements for the
transport protocol and message integrity.
7.3. NETMOD Yang modules
NETMOD developed initial Yang models for interfaces [RFC7223]), IP
address ([RFC7277]), IPv6 Router advertisement ([RFC7277]), IP
Systems ([RFC7317]) with system ID, system time management, DNS
resolver, Radius client, SSH, syslog
([I-D.ietf-netmod-syslog-model]), ACLS ([I-D.ietf-netmod-acl-model]),
and core routing blocks ([I-D.ietf-netmod-routing-cfg] The routing
working group (rtgwg) has begun to examine policy for routing and
tunnels.
Protocol specific Working groups have developed yang models for ISIS
([I-D.ietf-isis-yang-isis-cfg]), OSPF ([I-D.ietf-ospf-yang]), and BGP
( merge of [I-D.shaikh-idr-bgp-model] and [I-D.zhdankin-idr-bgp-cfg]
with the bgp policy proposed multiple Working groups (idr and
rtgwg)). BGP Services yang models have been proposed for PPB EVPN
([I-D.tsingh-bess-pbb-evpn-yang-cfg]), EVPN
([I-D.zhuang-bess-evpn-yang]), L3VPN ([I-D.zhuang-bess-l3vpn-yang]),
and multicast MPLS/BGP IP VPNs ([I-D.liu-bess-mvpn-yang]).
7.4. COPS
One early focus on flow filtering based on policy enforcement of
traffic entering a network is the 1990s COPS [RFC2748] design (PEP
and PDP) as shown in figure 1. The Policy decision point kept
network-wide policy (E.g. ACLs) and sent it to Policy enforcements
who then would control what data flows between the two These decision
points controlled data flow from PEP to PEP. [RFC3084] describes COPS
use for policy provisioning.
PDP
+-----+ / \ +-----+
|PEP1 |--/ \---|PEP2 |
| | ACL/policy | |
| | | |
--| ----|------------|-----|-----
+-----+ data flow +-----+
Figure 11
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COPS had a design of Policy Enforcement Points (PEP), and policy
Decision Points (PDP) as shown in figure 11. These decision points
controlled flow from PEP to PEP.
Why COPS is no longer used
Security in the network in 2015 uses specific devices (IDS/IPS, NAT
firewall, etc) with specific policies and profiles for each types of
device. No common protocol or policy format exists between the policy
manager (PDP) and security enforcement points.
COPs RFCs: [RFC4261], [RFC2940], , [RFC3084], , [RFC3483]
Why I2NSF is different COPS
COPS was a protocol for policy related to Quality of Service (QoS)
and signalling protocols (e.g. RSVP) (security, flow, and others).
I2NSF creates a common protocol between security policy decision
points (SPDP) and security enforcement points (SEP). Today's security
devices currently only use proprietary protocols. Manufacturers would
like a security specific policy enforcement protocol rather than a
generic policy protocol.
7.5. PCP
As indicated by the name, the Port Control Protocol (PCP) enables an
IPv4 or IPv6 host to flexibly manage the IP address and port mapping
information on Network Address Translators (NATs) or firewalls, to
facilitate communication with remote hosts.
PCP RFCs:
[RFC6887]
[RFC7225]
[I-D.ietf-pcp-authentication]
[I-D.ietf-pcp-optimize-keepalives]
[I-D.ietf-pcp-proxy]
Why is I2NSF different from PCP:
Here are some aspects that I2NSF is different from PCP:
o PCP only supports the management of port and address information
rather than any other security functions
o Cover the proxy, firewall and NAT box proposals in I2NSF
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7.6. NSIS - Next steps in Signalling
NSIS is for standardizing an IP signalling protocol (RSVP) along data
path for end points to request its unique QoS characteristics, unique
FW policies or NAT needs (RFC5973) that are different from the FW/NAT
original setting. The requests are communicated directly to the FW/
NAT devices. NSIS is like east-west protocols that require all
involved devices to fully comply to make it work.
NSIS is path-coupled, it is possible to message every participating
device along a path without having to know its location, or its
location relative to other devices (this is particularly a pressing
issue when you've got one or more NATs present in the network, or
when trying to locate appropriate tunnel endpoints).
A diagram should be added here showing I2NSF and NSIS
Why I2NSF is different than NSIS:
o The I2NSF requests from clients do not go directly to network
security devices, but instead to controller or orchestrator that can
translate the application/user oriented policies to the involved
devices in the interface that they support.
o The I2NSF request does not require all network functions in a path
to comply, but it is a protocol between the I2NSF client and the
I2NSF Agent in the controller and orchestrator
o I2NSF defines client (applications) oriented descriptors (profiles,
or attributes) to request/negotiate/validate the network security
functions that are not on the local premises.
Why we belief I2NSF has a higher chance to be deployed than NSIS:
o Open Stack already has a proof-of-concept/preliminary
implementation, but the specification is not complete. IETF can play
an active role to make the specification for I2NSF is complete. IETF
can complete and extend the OpenStack implementation to provide an
interoperable specification that can meet the needs and requirements
of operators and is workable for suppliers of the technology. The
combination of a carefully designed interoperable IETF specification
with an open-source code development Open Stack will leverage the
strengths of the two communities, and expand the informal ties
between the two groups. A software development cycle has the
following components: architecture, design specification, coding, and
interoperability testing. The IETF can take ownership of the first
two steps, and provide expertise and a good working atmosphere (in
hack-a-thons) in the last two steps for OpenSTack or other
open-source coders.
o IETF has the expertise in security architecture and design for
interoperable protocols that span controllers/routers, middle- boxes,
and security end-systems.
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o IETF has a history of working on interoperable protocols or
virtualized network functions (L2VPN, L3VPN) that are deployed by
operators in large scale devices. IETF has a strong momentum to
create virtualized network functions (see SFC WG in routing) to be
deployed in network boxes. [Note: We need to add SACM and others
here].
8. Security Considerations
There is no security consideration
9. IANA Considerations
There is no IANA consideration
10. References
10.1. Normative References
[RFC0791] Postel, J., "Internet Protocol", STD 5, RFC 791,
September 1981.
[RFC2119] Bradner, S., "Key words for use in RFCs to
Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
10.2. Informative References
[I-D.dunbar-i2rs-discover-traffic-rules]
Dunbar, L. and S. Hares, "An
Information Model for Filter
Rules for Discovery and
Traffic for I2RS
Filter-Based RIB",
draft-dunbar-i2rs-discover-traffic-rules-00
(work in progress), March
2015.
[I-D.hares-i2rs-auth-trans] Hares, S.,
Migault, D., and J. Halpern, "I2RS
Security Related Requirements",
draft-hares-i2rs-auth-trans-04 (work in
progress), July 2015.
[I-D.hares-i2rs-bnp-eca-data-model]
Hares, S., Wu, Q., Tantsura, J.,
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and R. White, "An Information
Model for Basic Network Policy
and Filter Rules",
draft-hares-i2rs-bnp-eca-data-model-00
(work in progress), July 2015.
[I-D.hares-i2rs-info-model-service-topo]
Hares, S., Wu, W., Wang, Z.,
and J. You, "An Information
model for service topology",
draft-hares-i2rs-info-model-
service-topo-03 (work in
progress), January 2015.
[I-D.ietf-i2rs-architecture] Atlas, A.,
Halpern, J., Hares, S., Ward, D., and T.
Nadeau, "An Architecture for the
Interface to the Routing System",
draft-ietf-i2rs-architecture-09 (work in
progress), March 2015.
[I-D.ietf-i2rs-ephemeral-state] Haas,
J. and S. Hares, "I2RS Ephemeral
State Requirements",
draft-ietf-i2rs-ephemeral-state-00
(work in progress), June 2015.
[I-D.ietf-i2rs-problem-statement]
Atlas, A., Nadeau, T., and D. Ward,
"Interface to the Routing System
Problem Statement",
draft-ietf-i2rs-
problem-statement-06 (work in
progress), January 2015.
[I-D.ietf-i2rs-pub-sub-requirements]
Voit, E., Clemm, A., and A.
Prieto, "Requirements for
Subscription to YANG
Datastores",
draft-ietf-i2rs-pub-sub-
requirements-02 (work in
progress), March 2015.
[I-D.ietf-i2rs-rib-data-model] Wang,
L., Ananthakrishnan, H., Chen, M.,
amit.dass@ericsson.com, a., Kini, S.,
and N. Bahadur, "A YANG Data Model for
Routing Information Base (RIB)",
draft-ietf-i2rs-rib-data-model-00
(work in progress), April 2015.
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[I-D.ietf-i2rs-rib-info-model]
Bahadur, N., Folkes, R., Kini, S., and
J. Medved, "Routing Information Base
Info Model", draft-ietf-i2rs-rib-info-
model-06 (work in progress), March
2015.
[I-D.ietf-i2rs-traceability] Clarke, J.,
Salgueiro, G., and C. Pignataro,
"Interface to the Routing System (I2RS)
Traceability: Framework and Information
Model", draft-ietf-i2rs-traceability-03
(work in progress), May 2015.
[I-D.ietf-i2rs-usecase-reqs-summary]
Hares, S. and M. Chen, "Summary
of I2RS Use Case Requirements",
draft-ietf-i2rs-usecase-reqs-summary-01
(work in progress), May 2015.
[I-D.ietf-i2rs-yang-l2-network-topology]
Dong, J. and X. Wei, "A YANG
Data Model for Layer-2
Network Topologies",
draft-ietf-i2rs-yang-l2-network-
topology-00 (work in
progress), April 2015.
[I-D.ietf-i2rs-yang-network-topo]
Clemm, A., Medved, J., Varga, R.,
Tkacik, T., Bahadur, N., and H.
Ananthakrishnan, "A Data Model for
Network Topologies",
draft-ietf-i2rs-yang-network-topo-01
(work in progress), June 2015.
[I-D.ietf-isis-yang-isis-cfg]
Litkowski, S., Yeung, D., Lindem, A.,
Zhang, J., and L. Lhotka, "YANG Data
Model for ISIS protocol", draft-ietf-
isis-yang-isis-cfg-02 (work in
progress), March 2015.
[I-D.ietf-netconf-call-home] Watsen, K.,
"NETCONF Call Home and RESTCONF Call
Home", draft-ietf-netconf-call-home-06
(work in progress), May 2015.
[I-D.ietf-netconf-restconf] Bierman, A.,
Bjorklund, M., and K. Watsen, "RESTCONF
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Protocol", draft-ietf-netconf-restconf-04
(work in progress), January 2015.
[I-D.ietf-netconf-restconf-collection]
Bierman, A., Bjorklund, M.,
and K. Watsen, "RESTCONF
Collection Resource",
draft-ietf-netconf-restconf-
collection-00 (work in
progress), January 2015.
[I-D.ietf-netconf-zerotouch] Watsen, K.,
Clarke, J., and M. Abrahamsson, "Zero
Touch Provisioning for NETCONF Call Home
(ZeroTouch)", draft-
ietf-netconf-zerotouch-02 (work in
progress), March 2015.
[I-D.ietf-netmod-acl-model] Bogdanovic,
D., Sreenivasa, K., Huang, L., and D.
Blair, "Network Access Control List (ACL)
YANG Data Model",
draft-ietf-netmod-acl-model-02 (work in
progress), March 2015.
[I-D.ietf-netmod-routing-cfg] Lhotka,
L. and A. Lindem, "A YANG Data Model
for Routing Management",
draft-ietf-netmod-routing-cfg-19 (work
in progress), May 2015.
[I-D.ietf-netmod-syslog-model] Wildes,
C. and K. Sreenivasa, "SYSLOG YANG
model", draft-
ietf-netmod-syslog-model-03 (work in
progress), March 2015.
[I-D.ietf-ospf-yang] Yeung, D., Qu, Y., Zhang,
J., Bogdanovic, D., and K. Sreenivasa, "Yang
Data Model for OSPF Protocol", draft-
ietf-ospf-yang-00 (work in progress), March
2015.
[I-D.ietf-pcp-authentication]
Wasserman, M., Hartman, S., Zhang, D.,
and T. Reddy, "Port Control Protocol
(PCP) Authentication Mechanism", draft-
ietf-pcp-authentication-09 (work in
progress), May 2015.
[I-D.ietf-pcp-optimize-keepalives]
Reddy, T., Patil, P., Isomaki, M.,
and D. Wing, "Optimizing NAT and
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Firewall Keepalives Using Port
Control Protocol (PCP)",
draft-ietf-pcp-optimize-keepalives-06
(work in progress), May 2015.
[I-D.ietf-pcp-proxy] Perreault, S., Boucadair,
M., Penno, R., Wing, D., and S. Cheshire, "Port
Control Protocol (PCP) Proxy Function",
draft-ietf-pcp-proxy-08 (work in progress), May
2015.
[I-D.ietf-sacm-architecture] Cam-Winget,
N., Lorenzin, L., McDonald, I., and l.
loxx@cisco.com, "Secure Automation and
Continuous Monitoring (SACM)
Architecture", draft-ietf-sacm-
architecture-03 (work in progress),
March 2015.
[I-D.ietf-sacm-terminology] Waltermire,
D., Montville, A., Harrington, D.,
Cam-Winget, N., Lu, J., Ford, B., and M.
Kaeo, "Terminology for Security
Assessment",
draft-ietf-sacm-terminology-06 (work in
progress), February 2015.
[I-D.kini-i2rs-fb-rib-info-model]
Kini, S., Hares, S., Ghanwani, A.,
Krishnan, R., Wu, Q., Bogdanovic,
D., Tantsura, J., and R. White,
"Filter-Based RIB Information
Model",
draft-kini-i2rs-fb-rib-info-
model-00 (work in progress), March
2015.
[I-D.l3vpn-service-yang] Litkowski, S.,
Shakir, R., Tomotaki, L., and K. D'Souza,
"YANG Data Model for L3VPN service
delivery", draft-l3vpn- service-yang-00
(work in progress), February 2015.
[I-D.liu-bess-mvpn-yang] Liu, Y. and F. Guo,
"Yang Data Model for Multicast in MPLS/BGP
IP VPNs", draft-liu-bess-mvpn-yang-00 (work
in progress), April 2015.
[I-D.shaikh-idr-bgp-model] Shaikh, A.,
D'Souza, K., Bansal, D., and R. Shakir,
"BGP Model for Service Provider Networks",
draft-shaikh-idr- bgp-model-01 (work in
progress), March 2015.
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[I-D.shaikh-rtgwg-policy-model]
Shaikh, A., Shakir, R., D'Souza, K.,
and C. Chase, "Routing Policy
Configuration Model for Service
Provider Networks",
draft-shaikh-rtgwg-policy-model-01
(work in progress), July 2015.
[I-D.tsingh-bess-pbb-evpn-yang-cfg]
Tiruveedhula, K., Singh, T.,
Sajassi, A., Kumar, D., and L.
Jalil, "YANG Data Model for PBB
EVPN protocol", draft-
tsingh-bess-pbb-evpn-yang-cfg-00
(work in progress), March 2015.
[I-D.zhang-i2rs-l1-topo-yang-model]
Zhang, X., Rao, B., and X. Liu,
"A YANG Data Model for Layer 1
Network Topology",
draft-zhang-i2rs-l1-topo-yang-
model-01 (work in progress),
March 2015.
[I-D.zhdankin-idr-bgp-cfg] Alex, A.,
Patel, K., Clemm, A., Hares, S.,
Jethanandani, M., and X. Liu, "Yang Data
Model for BGP Protocol", draft-
zhdankin-idr-bgp-cfg-00 (work in
progress), January 2015.
[I-D.zhuang-bess-evpn-yang] Zhuang, S.
and Z. Li, "Yang Model for Ethernet VPN",
draft-zhuang-bess-evpn-yang-00 (work in
progress), December 2014.
[I-D.zhuang-bess-l3vpn-yang] Zhuang, S.
and Z. Li, "Yang Data Model for BGP/MPLS
IP VPNs",
draft-zhuang-bess-l3vpn-yang-00 (work in
progress), December 2014.
[RFC2748] Durham, D., Boyle, J., Cohen, R., Herzog, S.,
Rajan, R., and A. Sastry, "The COPS (Common Open Policy
Service) Protocol", RFC 2748, January 2000.
[RFC2940] Smith, A., Partain, D., and J. Seligson,
"Definitions of Managed Objects for Common Open Policy
Service (COPS) Protocol Clients", RFC 2940, October 2000.
[RFC3084] Chan, K., Seligson, J., Durham, D., Gai, S.,
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McCloghrie, K., Herzog, S., Reichmeyer, F., Yavatkar, R.,
and A. Smith, "COPS Usage for Policy Provisioning
(COPS-PR)", RFC 3084, March 2001.
[RFC3303] Srisuresh, P., Kuthan, J., Rosenberg, J.,
Molitor, A., and A. Rayhan, "Middlebox communication
architecture and framework", RFC 3303, August 2002.
[RFC3304] Swale, R., Mart, P., Sijben, P., Brim, S., and M.
Shore, "Middlebox Communications (midcom) Protocol
Requirements", RFC 3304, August 2002.
[RFC3483] Rawlins, D., Kulkarni, A., Bokaemper, M., and K.
Chan, "Framework for Policy Usage Feedback for Common Open
Policy Service with Policy Provisioning (COPS-PR)", RFC
3483, March 2003.
[RFC3484] Draves, R., "Default Address Selection for
Internet Protocol version 6 (IPv6)", RFC 3484, February
2003.
[RFC4080] Hancock, R., Karagiannis, G., Loughney, J., and
S. Van den Bosch, "Next Steps in Signaling (NSIS):
Framework", RFC 4080, June 2005.
[RFC4261] Walker, J. and A. Kulkarni, "Common Open Policy
Service (COPS) Over Transport Layer Security (TLS)", RFC
4261, December 2005.
[RFC4949] Shirey, R., "Internet Security Glossary, Version
2", RFC 4949, August 2007.
[RFC5189] Stiemerling, M., Quittek, J., and T. Taylor,
"Middlebox Communication (MIDCOM) Protocol Semantics", RFC
5189, March 2008.
[RFC5277] Chisholm, S. and H. Trevino, "NETCONF Event
Notifications", RFC 5277, July 2008.
[RFC5539] Badra, M., "NETCONF over Transport Layer Security
(TLS)", RFC 5539, May 2009.
[RFC5973] Stiemerling, M., Tschofenig, H., Aoun, C., and E.
Davies, "NAT/Firewall NSIS Signaling Layer Protocol
(NSLP)", RFC 5973, October 2010.
[RFC6022] Scott, M. and M. Bjorklund, "YANG Module for
NETCONF Monitoring", RFC 6022, October 2010.
[RFC6241] Enns, R., Bjorklund, M., Schoenwaelder, J., and
A. Bierman, "Network Configuration Protocol (NETCONF)", RFC
6241, June 2011.
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[RFC6242] Wasserman, M., "Using the NETCONF Protocol over
Secure Shell (SSH)", RFC 6242, June 2011.
[RFC6243] Bierman, A. and B. Lengyel, "With-defaults
Capability for NETCONF", RFC 6243, June 2011.
[RFC6436] Amante, S., Carpenter, B., and S. Jiang,
"Rationale for Update to the IPv6 Flow Label
Specification", RFC 6436, November 2011.
[RFC6470] Bierman, A., "Network Configuration Protocol
(NETCONF) Base Notifications", RFC 6470, February 2012.
[RFC6536] Bierman, A. and M. Bjorklund, "Network
Configuration Protocol (NETCONF) Access Control Model", RFC
6536, March 2012.
[RFC6639] King, D. and M. Venkatesan, "Multiprotocol Label
Switching Transport Profile (MPLS-TP) MIB-Based Management
Overview", RFC 6639, June 2012.
[RFC6887] Wing, D., Cheshire, S., Boucadair, M., Penno, R.,
and P. Selkirk, "Port Control Protocol (PCP)", RFC 6887,
April 2013.
[RFC7223] Bjorklund, M., "A YANG Data Model for Interface
Management", RFC 7223, May 2014.
[RFC7225] Boucadair, M., "Discovering NAT64 IPv6 Prefixes
Using the Port Control Protocol (PCP)", RFC 7225, May 2014.
[RFC7277] Bjorklund, M., "A YANG Data Model for IP
Management", RFC 7277, June 2014.
[RFC7317] Bierman, A. and M. Bjorklund, "A YANG Data Model
for System Management", RFC 7317, August 2014.
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Authors' Addresses
Susan Hares
Huawei
7453 Hickory Hill
Saline, MI 48176
USA
Email: shares@ndzh.com
Bob Moskowitz
HTT Consulting
Oak Park, MI 48237
Email: rgm@labs.htt-consult.com
Hosnieh Rafiee
http://www.rozanak.com
Munich, Germany
Phone: +49 (0) 17657587575
Email: ietf@rozanak.com
Dacheng Zhang
Beijing
China
Email: dacheng.zdc@aliabab-inc.com
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