Zero Touch Provisioning for NETCONF Call Home (ZeroTouch)
draft-ietf-netconf-zerotouch-01
The information below is for an old version of the document.
| Document | Type |
This is an older version of an Internet-Draft that was ultimately published as RFC 8572.
|
|
|---|---|---|---|
| Authors | Kent Watsen , Steve Hanna , Joe Clarke , Mikael Abrahamsson | ||
| Last updated | 2014-10-27 | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
| Formats | |||
| Reviews | |||
| Additional resources | Mailing list discussion | ||
| Stream | WG state | WG Document | |
| Document shepherd | (None) | ||
| IESG | IESG state | Became RFC 8572 (Proposed Standard) | |
| Consensus boilerplate | Unknown | ||
| Telechat date | (None) | ||
| Responsible AD | (None) | ||
| Send notices to | (None) |
draft-ietf-netconf-zerotouch-01
NETCONF Working Group K. Watsen
Internet-Draft S. Hanna
Intended status: Standards Track Juniper Networks
Expires: April 30, 2015 J. Clarke
Cisco Systems
M. Abrahamsson
T-Systems
October 27, 2014
Zero Touch Provisioning for NETCONF Call Home (ZeroTouch)
draft-ietf-netconf-zerotouch-01
Abstract
This draft presents a technique for establishing a secure NETCONF
connection between a newly deployed IP-based device, configured with
just its factory default settings, and the new owner's Network
Management System (NMS).
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
Task Force (IETF). Note that other groups may also distribute
working 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 April 30, 2015.
Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
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include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Objectives . . . . . . . . . . . . . . . . . . . . . . . 3
1.3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4. Actors and Roles . . . . . . . . . . . . . . . . . . . . 5
2. Configuration Server . . . . . . . . . . . . . . . . . . . . 7
2.1. Service Interface . . . . . . . . . . . . . . . . . . . . 7
2.2. Interactive Interface . . . . . . . . . . . . . . . . . . 7
2.3. Transport Security . . . . . . . . . . . . . . . . . . . 7
2.4. Expiration Policy . . . . . . . . . . . . . . . . . . . . 8
2.5. Troubleshooting and Auditing . . . . . . . . . . . . . . 8
3. Configuration Signer . . . . . . . . . . . . . . . . . . . . 9
3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2. Signing Configurations . . . . . . . . . . . . . . . . . 9
3.3. Optional Encryption . . . . . . . . . . . . . . . . . . . 9
3.4. Delegation of Trust . . . . . . . . . . . . . . . . . . . 9
3.5. Delegation to a Specific Customer . . . . . . . . . . . . 10
4. Device . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2. Factory Default State . . . . . . . . . . . . . . . . . . 11
4.3. Boot Sequence . . . . . . . . . . . . . . . . . . . . . . 12
5. Network Management System (NMS) . . . . . . . . . . . . . . . 15
5.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2. Precondition . . . . . . . . . . . . . . . . . . . . . . 16
5.3. Connection Handling . . . . . . . . . . . . . . . . . . . 17
6. Vendor . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1. Order Information . . . . . . . . . . . . . . . . . . . . 17
6.2. Ownership Validation . . . . . . . . . . . . . . . . . . 17
7. Configlet . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 17
7.2. Data Model . . . . . . . . . . . . . . . . . . . . . . . 18
7.3. Signature . . . . . . . . . . . . . . . . . . . . . . . . 19
7.4. Encryption (optional) . . . . . . . . . . . . . . . . . . 19
7.5. XSD Schema . . . . . . . . . . . . . . . . . . . . . . . 19
8. Security Considerations . . . . . . . . . . . . . . . . . . . 21
8.1. Immutable storage for trust anchors . . . . . . . . . . . 21
8.2. Substitutions . . . . . . . . . . . . . . . . . . . . . . 21
8.3. Confidentiality . . . . . . . . . . . . . . . . . . . . . 22
8.4. Entropy loss over time . . . . . . . . . . . . . . . . . 22
8.5. Serial Numbers . . . . . . . . . . . . . . . . . . . . . 22
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 23
9.1. ZeroTouch Information DHCP Option . . . . . . . . . . . . 23
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9.1.1. DHCP v4 Option . . . . . . . . . . . . . . . . . . . 23
9.1.2. DHCP v6 Option . . . . . . . . . . . . . . . . . . . 23
9.2. Media Types for Boot Images and Configurations . . . . . 23
9.2.1. application/zerotouch-configlet . . . . . . . . . . . 24
9.2.2. application/zerotouch-bootimage . . . . . . . . . . . 25
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 26
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 26
11.1. Normative References . . . . . . . . . . . . . . . . . . 26
11.2. Informative References . . . . . . . . . . . . . . . . . 27
Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . . 28
A.1. Unsigned Configlet . . . . . . . . . . . . . . . . . . . 28
A.2. Signed Configlet . . . . . . . . . . . . . . . . . . . . 29
A.3. Encrypted Configlet . . . . . . . . . . . . . . . . . . . 32
A.4. Signed Encrypted Configlet . . . . . . . . . . . . . . . 33
Appendix B. Change Log . . . . . . . . . . . . . . . . . . . . . 36
B.1. ID to 00 . . . . . . . . . . . . . . . . . . . . . . . . 36
B.2. 00 to 01 . . . . . . . . . . . . . . . . . . . . . . . . 37
1. Introduction
1.1. 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 [RFC2119].
1.2. Objectives
A fundamental business requirement is to reduce operational costs
where possible. Deploying new IP-based devices is many times one of
the largest costs in running a network, as sending trained
specialists to each site to do an installation is both cost
prohibitive and does not scale.
Both networking vendors and standard bodies have tried to address
this issue, with varying levels of success. For instance, the
Broadband Forum TR-069 specification [TR069] relies solely on DHCP
for NMS discovery, but this can only work in environments where the
DHCP server is locally administered, which is not the case when the
device is connected to an ISP's network. In another example, some
network vendors have enabled their devices to load an initial
configuration from removable storage media (e.g., a USB flash drive),
but not all devices have such ports.
The solution presented herein, ZeroTouch, enables a device to
securely obtain an initial configuration from the network without any
operator intervention. The discovered configuration initiates the
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device to "call home" using either SSH or TLS, as described in
[NETCONF-CALL-HOME].
1.3. Use Cases
o Connecting to a remotely administered network
This use-case involves scenarios, such as a remote branch
office or convenience store, whereby the device connects to an
ISP's network. In this case, the device receives only generic
networking settings (address, netmask, gateway, DNS servers,
etc.) provided by the ISP, with no site-specific
customizations, such that the device has no recourse but to
reach out to the presumably insecure network for its initial
configuration.
o Connecting to a locally administered network
This use-case covers all other scenarios and differs only in
that the device may additionally receive some site-specific
information to guide its call home process, which could then
direct it to a local server for its initial configuration. If
no site-specific information is provided, or the device is
unable to use the information provided, it can then reach out
to network just as it would for a remotely administered
network.
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1.4. Actors and Roles
fetches Configlet and
+----------+ boot-image, if needed
+------------| Device |---------------------+
| +----------+ |
| ^ |
| | V
| call home | manufactures +----------+
| | with necessary | Config |
| | default state | Server |<----+
| | for ZeroTouch +----------+ |
| | |
| | |
| +----------+ delegates trust |
| | Vendor |-------------------+ |
| +----------+ | |
| ^ ^ | |
| | | V |
| | | +----------+ |
| imports | | validate owner | Config | |
| trust | +-----------------| Signer | |
| anchor | +----------+ |
| | ^ |
| | | |
| +---------+ requests signing | |
+----------->| NMS |--------------------+ |
+---------+ |
| |
+----------------------------------------+
signed Configlet and boot-image file
Though not represented as a box in the diagram, the Configlet is also
a first-class object in the solution.
o Configlet
A Configlet is an XML document that, when loaded onto a device,
configures the device to initiate a call home connection to a
deployment specific NMS, as well as set a local administrator
account for the NMS to log into. The Configlet is signed and
optionally encrypted. More information about Configlets is in
Section 7.
o Configuration Server
A Configuration Server hosts Configlets and boot-images to be
downloaded over a network via HTTP/S. Configuration Servers
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can be deployed either on the locally administered network or
on some external network (e.g., the Internet). Configuration
Servers are known to devices in the form of a URI, which can be
either preconfigured or dynamically discovered. More
information about Configuration Servers is in Section 2.
o Configuration Signer
A Configuration Signer is an entity that the device's vendor
has delegated the Configlet-signing function to. A
Configuration Signer only needs to ensure that the requestor is
the rightful owner of the device to which a configuration is
destined. A Configuration Signer may be site-specific or an
external entity. More information about Configuration Signers
is in Section 3.
o Device
The device is the networking entity that initiates ZeroTouch,
whenever booting with its factory default settings. The device
is preconfigured with a secure device identity, Configuration
Servers URIs, and certificates for both Configuration Signers
and Configuration Servers it trusts by default. A device may
dynamically discover additional URIs and certificates from a
locally-administered network. More information about Devices
is in Section 4.
o Network Management System
The NMS is the deployment-specific system that devices initiate
their call home connections to. The NMS must be configured
with vendor-specific trust anchors and unique device
identifiers. The administrators of the NMS system interact
with Configuration Signer and Configuration Server systems to
stage the the device configurations. More information about
Network Management Systems is in Section 5.
o Vendor
Vendors manufacture the devices with secure device identities
and preconfigured Configuration URIs, and Configuration Signer
certificates. Vendors are the de facto Configuration Signer
for the devices it manufactures, but may delegate that role to
external Configuration Signers. More information about Vendors
is in Section 6.
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2. Configuration Server
A Configuration Server is the entity hosting configurations that can
be downloaded over a network. This section describes the service
interface a Configuration Server MUST implement as well as what's
needed for transport security.
2.1. Service Interface
Configuration Servers are known to devices in the form of a URI.
Configuration Servers MUST support the URI schemes "https" and
"http". Other URI schemes are not supported.
When accessing a Configuration Server, the device appends its unique
device identifier (UID) to the URI. The unique identifier MUST be
the same as the identifier stored within the device's IDevID
certificate, which is described in Section 4.2.
For instance, if the URI were:
http://example.com/zerotouch/devices/
https://example.com/zerotouch?id=
then the device would try to access:
http://example.com/zerotouch/devices/<uid>
https://example.com/zerotouch?id=<uid>
When accessing the Configuration Server, the HTTP Accept-Type MUST be
set to either "application/zerotouch-configlet" or "application/
zerotouch-bootimage". Please see Section 9.2. A wildcard Accept-
Type (e.g., */*) SHOULD default to "application/zerotouch-configlet".
2.2. Interactive Interface
The Configuration server SHOULD provide a user-facing interface to
enable the end-user to provide a Configlet and, optionally, a
bootimage file. How the Configlet and bootimage file are provided to
the Configuration Server is outside the scope of this document.
2.3. Transport Security
As described in Section 3, configurations MUST be signed and MAY be
encrypted. As such, transport-level security is not needed to assure
authenticity or confidentiality of the configuration itself.
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However, transport-level security enables devices to authenticate the
Configuration Server and also extends confidentiality to the
application-level protocol. Therefore, it is RECOMMENDED that only
secure URL schemes are used (see Section 2.1).
If a Configuration Server uses X.509-based encryption, then its X.509
certificate MUST have a chain of trust to a trust anchor known to
devices (see Section 4.2. More specifically, the Configuration
Server MUST possess all the intermediate certificates leading to the
trust anchor.
When a Configuration Server negotiates encryption with the device, it
provides the chain of certificates, from its server specific
certificate to, but not including, its trust anchor. Including the
trust anchor's certificate is unnecessary since the device MUST be
pre-provisioned with it. Devices need the chain of certificates to
be passed so they can validate the server using only a simple list of
Configuration Server trust anchors.
2.4. Expiration Policy
An expiration policy is needed to limit how long a Configuration
Server needs to retain a configuration and, in turn, how many
configurations it might need to retain at a given time.
It is expected that Configuration Servers will enable retention
information to be given at the same time as when the configuration is
provided to it. Options should be temporal in nature, not based on
access counts, so as to thwart a DoS attack whereby the configuration
is accessed by an entity other than the device. Configuration
Servers SHOULD put a limit on the maximum amount of time it will hold
onto a configuration before purging it, even if the configuration had
never been accessed.
2.5. Troubleshooting and Auditing
In order to facilitate troubleshooting and auditing, the
Configuration Server SHOULD record into a log a record of the various
Configlet download requests. This draft does not define what
information should be kept or for how long.
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3. Configuration Signer
3.1. Overview
A Configuration Signer MUST be able to sign configurations. This
function requires the Configuration Signer be able to authenticate
that the requestor is the true owner of the device, as identified
within the contents of the configuration being signed.
The user interface a Configuration Signer provides to perform its
role is outside the scope of this document. However, in order to
meet operational expectations, the time it takes to respond to a
request should be as expeditious as possible.
A Configuration Signer does not need to retain a configuration after
signing it. The Configuration Signer SHOULD retain an audit log for
indemnification purposes.
3.2. Signing Configurations
A Configuration Signer MUST have an X.509 certificate with Key Usage
capable of signing data (digitalSignature) and be signed by a
certificate authority having a chain of trust leading to a trust
anchor known to the devices loading its Configlets. The
Configuration Signer MUST possess all intermediate certificates
leading to its trust anchor.
When a Configuration Signer signs a Configlet, it attaches both the
signature and the chain of X.509 certificates, including its own, but
not necessarily including the trust anchor's certificate. This chain
of certificates is needed so a device can validate a Configlet using
only the Configuration Signer trust anchors known to it.
3.3. Optional Encryption
A Configuration Signer MAY optionally encrypt configurations prior to
signing them. This function requires the Configuration Signer know
the device's unique public key, as encoded within its secure device
identity certificate.
3.4. Delegation of Trust
A device's vendor is the root of trust for all of its devices. That
is, the vendor's devices implicitly trust the vendor for such things
as software images, subscription updates, and licenses. As such, the
vendor is the ultimate Configuration Signer for its devices.
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However, both vendors and its customers may prefer that this role be
performed by another entity. For instance, a vendor may not want
this role due to it being outside its primary business function, and
customers may not want the vendor to have this role for privacy
reasons.
It is therefore provided that a vendor MAY delegate the Configuration
Signer role to other entities. Using X.509 certificates, the Vendor
need only sign the delegate's certificate signing request (CSR),
providing back to the delegate a signed X.509 certificate
authenticating its ability to perform the signing function.
In order enable a delegate to fulfill its operational role, as
described in Section 3.1, the vendor MUST provide a mechanism that
can be used to authenticate if a given requestor is the true owner of
a specific device. Additionally, to support Configuration Signers
that want to encrypt configurations, the vendor MUST also provide a
means for the Configuration Signer to know the public key for a given
device. How the vendor provides this information to Configuration
Signers is outside the scope of this document.
3.5. Delegation to a Specific Customer
The general expectation is that the Configuration Signer is an
impartial 3rd-party. However, certain deployments may want to be
able to perform the function for themselves. Yet without
constraints, that deployment could sign configurations for devices
that do not belong to it.
Resolving this concern is possible when 1) the deployment specific
Configuration Signer's certificate is annotated with a customer
identifier and 2) the devices sold to that customer have that same
identifier encoded into their secure device identifier.
This entails the vendor augmenting its manufacturing process for
these special devices, which would likely be sold directly to the
customer, as opposed to through a sales channel. This takes
extraordinary effort and likely only implemented for the most
important customers, if at all.
4. Device
4.1. Overview
While the wholistic solution, ZeroTouch, involves a number of
entities, a device being powered-on is the essential event that sets
things in motion.
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Whenever a device boots with its factory default settings, it
initiates ZeroTouch with the goal of finding a configuration to
initialize itself with. Once a configuration is found, the device
initializes its running datastore with it and then enters normal
operation. Since the configuration initializes the device to call
home upon entering its normal operating mode, the device immediately
begins trying to establish a secure connection with the deployment
specific NMS.
4.2. Factory Default State
+------------------------------------------------------------------+
| <device> |
| |
| +------------------------------------------------------+ |
| | <immutable storage> | |
| | | |
| | list of Configuration Signer trust anchor certs | |
| | list of Configuration Server trust anchor certs | |
| +------------------------------------------------------+ |
| |
| +----------------------------------------------------------+ |
| | <other storage> | |
| | | |
| | two sets of Configuration Server URIs | |
| | IDevID entity & associated intermediate certificate(s) | |
| +----------------------------------------------------------+ |
| |
| +----------------------+ |
| | <secure storage> | |
| | | |
| | IDevID private key | |
| +----------------------+ |
| |
+------------------------------------------------------------------+
Devices supporting ZeroTouch MUST have a manufacturer-provisioned
secure device identifier, as defined in [Std-802.1AR-2009]. This
identifier is known by the IEEE standard as the Initial Device
Identifier (IDevID). The IDevID includes both an X.509 certificate,
encoding a globally unique per-device identifier, and a chain of
X.509 certificates leading to the manufacturer's well-known trust
anchor. The IDevID is needed in order for the NMS to positively
authenticate a device. The IDevID certificate MUST be used by the
NETCONF server as its SSH host-key (see [RFC6187]) or its TLS server
certificate, depending on which protocol is used.
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Devices supporting ZeroTouch MUST be pre-provisioned with one or more
URIs for Internet-based Configuration Servers. These URIs SHOULD be
partitioned into one set that contains secure schemes (e.g. https://)
and another set that contains insecure schemes (e.g., http://). The
reason for partitioning the URIs is so all the secure schemes can
attempted before any of the insecure schemes (see Section 4.3). When
using a secure scheme, the Configuration Server MUST be authenticated
using a trust anchor the device possesses. As each Configuration
Server may use a different trust anchor, this generalizes to a list
of Configuration Server trust anchor certificates.
In order to verify the signature on retrieved configurations, devices
supporting ZeroTouch MUST also possess the trust anchor for the
Configuration Signer that signed the configuration. Generally, only
the manufacturer's trust anchor is needed, as it can then delegate
trust for 3rd-party Configuration Signers (see Section 3.4).
However, for various reasons, there may be a need for more than one
root anchor and therefore this generalizes to a list of Configuration
Signer trust anchor certificates.
Devices SHOULD ensure that the certificates for its trust anchors are
protected from external modification. It is for this reason that the
diagram shows the Configuration Signer and Configuration Server
certificates in immutable storage. Similarly, per
[Std-802.1AR-2009], the IDevID private key shall be stored
confidentially and not available outside the IDevID module, hence the
diagram shows it is held within secure storage.
4.3. Boot Sequence
DEVICE DHCP CONFIGURATION NMS
| SERVER/RELAY SERVERS |
| | | |
+-->| | | |
| | | | |
| |--[if running config != factory default, boot normally]--+ |
| | | | | |
<---------------------------------------------------------------+ |
| | | | |
| | | | |
| | | | |
| |--(discovery)-->| [if no dhcp server found, boot normally] |
| | | | |
| | +---(offer)---| | |
| | | | | |
| | +--[add any listed config servers to built-in list]--+ |
| | | | | |
| |<------------------------------------------------------+ |
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| | | | |
| | | | |
| | | | |
| | (iterate until match, else boot normally) | |
| |------------------------------------------------>| |
| | | | |
| |<------------------------------(zerotouch info)--| |
| | | | |
| | | | |
| | | | |
| |--[if current image != expected, get image]----->| |
| | | | |
| | +-------------------------------------(image)--| |
| | | | | |
| | +--[if image valid, install & reboot]--+ | |
| | | | | |
+---------------------------------------------+ | |
| | | |
| | | |
| | | |
|--[get config]---------------------------------->| |
| | | |
| +------------------------------------(config)--| |
| | | | |
| +--[if config valid, merge into running]--+ | |
| | | | |
| +--------------------------------------+ | |
| | | | |
| +--[per new configuration, call home]----------------->|
| | | |
| | | |
Whenever a device boots with its factory default settings, it
initiates ZeroTouch with the goal of finding a configuration that
will enable it to call home to its deployment-specific NMS.
The process begins with the device using the DHCP protocol to obtain
a dynamic assignment for its networking stack. When broadcasting the
DISCOVERY request, the device may provide any DHCP options to
identify itself or the type of device it is (e.g. IPV4 options 60 or
61).
If the DHCP servers reside on a locally administered network (see
Section 1.3), then their OFFER responses MAY include the ZeroTouch
Information DHCP option defined in Section 9.1, as well as the legacy
DHCP options for TFTP server name, bootfile name, and/or vendor
specific information (e.g. IPv4 options 43, 66, 67).
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If a DHCP server provides both the ZeroTouch Information and the
vendor specific information DHCP options, then the ZeroTouch
Information option MUST be processed first. After exhausting all
ZeroTouch options without being able to call home, a device MAY then
process the information provided by the legacy DHCP options.
The ZeroTouch Information option Section 9.1 provides a set of
Configuration Server URIs. If returned by the DHCP server, the
device MUST append each URI to the end of one of its two sets of
Configuration Server URIs, depending on if the URI's scheme is secure
or not. URIs added this way MUST remain distinguishable from those
URIs the device was shipped with, for reasons discussed next.
The device then iterates over its two sets of Configuration Server
URIs. The device MUST first try all the URIs from the set having
secure schemes before trying any of the URIs from the set having
insecure schemes. For each URI, until a match is found and
successfully loaded, the device attempts to initialize itself from
the URI. If the URI uses a secure scheme (e.g., https), the device
MUST validate the Configuration Server's certificate using one of its
Configuration Server trust anchors. If the device is unable to
verify the server's certificate, the device MUST skip that URI. If
the device reaches the end of all its URIs without finding a usable
match, it SHOULD continue its normal boot sequence using its factory
default configuration.
When the device is accessing a Configuration Server URI that it was
shipped with (i.e. not discovered while initializing its networking),
it MUST do so by appending its UID to the URI string and using the
Accept-Type "application/zerotouch-configlet", as described in
Section 2. For URIs discovered via the ZeroTouch Information option,
the device MAY also try the raw URI after trying the permutation
using its UID.
If the Configuration Server returns a configuration, the device MUST
first verify it before use. Configuration verification entails both
verifying the configuration's signature using the device's list of
Configuration Signer trust anchors, and also verifying that the
unique identifier within the Configlet matches the device's unique
identifier.
Once the configuration is authenticated, the device MUST compare its
software image version with the expected version specified within the
configuration. If there is a mismatch, the device MUST download the
correct image version from the Configuration Server, by appending its
UID to the Configuration Server's URI string and using the Accept-
Type "application/zerotouch-bootimage", as described in Section 2.
For URIs discovered via the ZeroTouch Information option, the device
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MAY also try the raw URI after first trying the permutation using its
UID. Once the image has been downloaded, the device MUST install it
and reboot, still with the factory default settings configured, so
that ZeroTouch restarts when the device comes back up.
If the device is running the correct software image version, it
merges the Configlet's contents into its running configuration. This
step effectively modifies the device so that it is no longer having
its factory default setting. Thus, at this point, a reboot is no
longer expected to start the ZeroTouch process.
Though not technically required, the Configlet is presumed to have
configured the device to "call home". As soon as this configuration
is merged into the running configuration, the device SHOULD
immediately begin trying to establish the call home connection, as
specified by the Configlet.
If configured to establish a SSH connection, the the device MUST use
its IDevID and associated intermediate X.509 certificates as its host
key per RFC 6187 [RFC6187]. If configured to establish a TLS
connection, the device MUST use its IDevID and associated
intermediate X.509 certificates as its server-side certificate for
the TLS connection.
In order to facilitate troubleshooting, the device SHOULD record into
a log information relating to its stepping through the ZeroTouch
sequence of steps. This draft does not define any specific log
messages, for instance, for Syslog or SNMP.
5. Network Management System (NMS)
5.1. Overview
The NMS is the ultimate destination of ZeroTouch for a device. It is
the NMS's network address configured in the Configlet. The device
will initiate a call home connection to the NMS, using either SSH or
TLS, as configured by the Configlet loaded.
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5.2. Precondition
+------------------------------------------------------------------+
| <nsm> |
| |
| +------------------------------------------------------+ |
| | <immutable storage> | |
| | | |
| | list of IDevID trust anchor certificates | |
| | list of expected device unique identifiers | |
| +------------------------------------------------------+ |
| |
| +--------------------------------------------------+ |
| | <secure storage> | |
| | | |
| | map of device identifiers to login credentials | |
| +--------------------------------------------------+ |
| |
+------------------------------------------------------------------+
In order to authenticate the device, the NMS MUST possess the X.509
certificate for the trust anchor leading to the device's entity
certificate. The NMS uses this certificate to validate the server-
certificate the device presents during SSH or TLS transport
negotiation. Because an NMS may interoperate with multiple vendors,
and a vendor may have more than one trust anchor for signing its
devices IDevID certificates, this generalizes into the NMS needing a
list of trust anchor certificates. This certificates SHOULD be
stored in a way that prevents tampering, which is why they are shown
in immutable storage in the diagram.
In order for the NMS to validate that the specific device connecting
to it is expected, it MUST have a list of unique device identifiers
that it can use to validate the device's IDevID certificate with.
The list SHOULD be protected from external modification, which is why
it is shown in immutable storage in the diagram. In order for the
NMS to know the unique identifiers, device manufacturers will need to
provide a mechanism to convey this information to its customers.
This draft not specify a format for this information exchange.
In addition to authenticating the device, the NMS must also
authenticate itself to the device. How this is done is deployment
specific, but generalizes to the NMS needing to have login
credentials for each device. These credentials will entail knowing a
secret (e.g., password, private key). For this reason the diagram
shows the NMS storing a map of device credentials in secure storage.
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5.3. Connection Handling
When receiving a NETCONF call home connection from a device, the NSM
completes the connection as specified NETCONF Call Home
[NETCONF-CALL-HOME].
6. Vendor
6.1. Order Information
In order for a Vendor's customers to configure their NMSs with what
devices are expected, as well as to know how to set the "unique-
identifier" field within a Configlet when requesting a signing,
Vendors need to provide a mechanism for customers to obtain the
unique identifier value for the devices they have ordered. For
instance, customers could receive emails containing shipping
information for their devices.
Additionally, to facilitate workflows where the devices are initially
received by a customer-specific warehouse, or moved after having been
unboxed, it is ideal for the unique identifier to be easily tracked
through labels affixed to the device as well as the box it is
packaged in. A device's serial number is commonly treated this way
and would be suitable for this purpose, so long as it is directly
related to its IDevID identity.
6.2. Ownership Validation
In order for Configuration Signers to validate that a requestor is
the true owner of a device (i.e. its IDevID identity), Vendors need
to provide a mechanism enabling a near real-time lookup. The
interface used to implement this lookup is outside the scope of this
document.
7. Configlet
7.1. Overview
A Configlet is an XML file, containing specific YANG-defined
configuration, that has been signed by a trusted signer known to the
device (e.g., the device's manufacturer).
The Configlet data-model, defined by the XSD schema in Section 7.5,
contains information for the device to ensure that it's safe for it
to load the configlet (i.e. target-requirements) along with a
payload, the configuration the device is to merge into its running
datastore.
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In order for the device to call home, the configuration contained
within the Configlet MUST at least configure a local user account and
configure the connection information for the NMS the device is to
call home to. This configuration MAY use IETF-defined modules "ietf-
system" [RFC7317] and "ietf-netconf-server" [NETCONF-SERVER-MODEL].
The signature on the Configlet is enveloped, meaning that the
signature is contained inside the XML file itself. The signature
block also contains the X.509 certificate of the Configuration Signer
and its chain of trust.
Once a device authenticates the signature on a Configlet and matches
the unique identifier (e.g., serial number) within the Configlet, it
merges the configuration contained in the Configlet into its running
datastore.
7.2. Data Model
module: ietf-netconf-zerotouch
+--rw configlet
+--rw target-requirements
| +--rw unique-identifier string
| +--rw software-version string
+--rw configuration
The Configlet's data model is no more than a wrapper around a header
(i.e. <target-requirements>) and a payload (i.e. <configuration>).
The <target-requirements> element contains information that MUST be
validated by the device prior to processing the <configuration>
element. Specifically, it contains:
o unique-identifier
The unique-identifier field is used to ensure that the
Configlet is loaded onto the targeted device and no other.
This field is also used by the Configuration Signer, when
ensuring the requestor is the true owner of the device. The
value MUST be the same as the 'subject' field in the device's
IDevID credential, as specified by section 7.2.8 in IEEE Std
802.1AR-2009.
o software-version
The software-version field is used to ensure the device is
running the right software version prior to loading the
configuration (e.g., 14.1R2.5). If the device finds that it is
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not running the correct version of software, it MUST pull the
correct version from the Configuration Server.
The <configuration> element contains the configuration that is to be
committed to the device's running datastore. This element uses the
"anyxml" type, enabling it to contain either vendor-specific or
standards-based data models. When using standard models, in order to
complete a call home connection, only the following is needed:
o The "authentication" subtree from "ietf-system", defined in
[RFC7317].
o The "call-home" subtree from "ietf-netconf-server", defined in
[NETCONF-SERVER-MODEL].
7.3. Signature
All Configlets MUST be signed by a Configuration Signer in order to
be authentic. Devices MUST reject any Configlet that is either
unsigned or having an invalid signature. Configlets are signed using
the W3C standard "XML Signature Syntax and Processing" [XMLSIG]. The
entire contents of the Configlet MUST be signed. The signature block
must also include the Configuration Signer's certificate and any
intermediate certificates leading to a Configuration Signer trust
anchor. A signed Configlet example is in section Appendix A.2.
7.4. Encryption (optional)
Configlets MAY optionally be encrypted prior to being signed.
Encrypting the Configlet provides confidentiality for the Configlet's
contents without relying on transport-level security. Configlets are
encrypted using the W3C standard "XML Encryption Syntax and
Processing" [XMLENC]. The entire contents of the Configlet MUST be
encrypted. An encrypted Configlet example is in section
Appendix A.4.
7.5. XSD Schema
Following is the XSD for the Configlet:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns="urn:ietf:params:xml:ns:ietf-netconf-zerotouch"
targetNamespace="urn:ietf:params:xml:ns:ietf-netconf-zerotouch"
elementFormDefault="qualified">
<xs:element name="configlet">
<xs:complexType>
<xs:sequence>
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<xs:element name="target-requirements">
<xs:complexType>
<xs:sequence>
<xs:element name="unique-identifier" type="xs:string">
<xs:annotation>
<xs:documentation>
Specifies the unique identifier of the device that
is to process this Configlet. The value MUST be
the same as the 'subject' field in the device's
DevID credential, as specified by section 7.2.8
in IEEE Std 802.1AR-2009.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element name="software-version" type="xs:string">
<xs:annotation>
<xs:documentation>
In order to process this Configlet, the device
MUST must be running this version of software.
The value is device-specific, but it MUST be
an exact match (e.g., 14.1R2.5)
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="configuration">
<xs:annotation>
<xs:documentation>
The configuration to be committed to the device's
running datastore. The configuration MUST be valid
for the target device.
Devices supporting ZeroTouch SHOULD support the
following standard data-models:
ietf-system // RFC 7317
ietf-netconf-server // RFC YYYY
These two data models contain everything needed to
support NETCONF call home using either SSH or TLS.
References:
RFC 7317: A YANG Data Model for System Management
RFC YYYY: NETCONF Server Configuration Model
</xs:documentation>
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</xs:annotation>
<xs:complexType>
<xs:sequence maxOccurs="unbounded">
<xs:any processContents="skip"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
8. Security Considerations
8.1. Immutable storage for trust anchors
Devices SHOULD ensure that all its trust anchor certificates,
including those for the Configuration Signer and Configuration
Server, are protected from external modification. It is for this
reason that the diagram in Section 4.2 shows them in immutable
storage.
However, it may be necessary to update these certificates over time
(e.g., the vendor wants to delegate trust to a new CA). It is
therefore expected that devices MAY update these trust anchors when
needed through a verifiable process, such as a software upgrade using
signed software images.
8.2. Substitutions
It is generally not possible to substitute a Configlet created for a
different device, since devices assert that the Configlet contains
their unique identifier (e.g., serial number).
However, it is possible to substitute a Configlet created for a
device with a different Configlet created for the same device.
Generally, unless imposed by the Configuration Signers, there is no
limit to the number of Configlets that may be generated for a given
device. This could be resolved, in part, by placing a timestamp into
the Configlet and ensuring devices do not load Configlets older than
some amount, but this requires the devices have an accurate clock
when validating a Configlet and for Configuration Signers to not sign
a Configlet when another Configlet is still active.
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8.3. Confidentiality
This draft allows devices to use insecure schemes when doing a
Configuration Server lookup. This is deemed acceptable because the
Configlet is tamper-proof, since it MUST be signed, only
confidentiality is lost.
Confidentiality of a Configlet's contents is assured when either the
Configlet is encrypted or when the a secure scheme is used when
accessing the Configuration Server.
Some confidentiality is lost when an insecure scheme is used to
access a Configuration Server, as then the device's unique identifier
is in the clear.
Given the fairly regular format for unique identifiers, it is
possible that an adversary to guess unique identifiers and access a
device's Configlet. Configlets that have been encrypted do not
disclose any confidential information.
8.4. Entropy loss over time
Section 7.2.7.2 of the IEEE Std 802.1AR-2009 standard says that
IDevID certificate should never expire (i.e. having a notAfter
99991231235959Z). Given the long-lived nature of these certificates,
it is paramount to use a strong key length (e.g., 512-bit ECC).
Vendors SHOULD deploy Online Certificate State Protocol (OCSP)
responders or CRL Distribution Points (CDP) to revoke certificates in
case necessary.
8.5. Serial Numbers
This draft mentions using the device's serial number as its unique
identifier in its IDevID certificate. This is because serial numbers
are ubiquitous and prominently contained in invoices and on labels
affixed to devices and their packaging. That said, serial numbers
many times encode revealing information, such as the device's model
number, manufacture date, and/or sequence number. Knowledge of this
information may provide an adversary with details needed to launch an
attack. To address this concern, the certificate could contain the
hash of the serial number instead, which the NMS could also compute,
but doing so is much less intuitive and raises questions if it is
just security through obscurity.
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9. IANA Considerations
9.1. ZeroTouch Information DHCP Option
The following registration is in accordance to RFC 2939 for "BOOTP
Vendor Extensions and DHCP Options" registry maintained at
http://www.iana.org/assignments/bootp-dhcp-parameters.
9.1.1. DHCP v4 Option
Tag: XXX
Name: Zero Touch Information
Description: Returns a list of null-terminated Configuration
Server URIs
Code Len
+-----+-----+------+------+----
| XXX | n | url1 | url2 | ...
+-----+-----+------+------+----
Reference: RFC XXXX
9.1.2. DHCP v6 Option
Tag: YYY
Name: Zero Touch Information
Description: Returns a list of null-terminated Configuration
Server URIs
Code Len
+-----+-----+------+------+----
| YYY | n | url1 | url2 | ...
+-----+-----+------+------+----
Reference: RFC XXXX
9.2. Media Types for Boot Images and Configurations
The following registrations are in accordance to RFC 6838.
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9.2.1. application/zerotouch-configlet
Type name: application
Subtype name: zerotouch-configlet
Required parameters: None
Optional parameters: None
Encoding considerations: 8-bit
Security considerations: See Security Considerations in RFC XXXX
Interoperability considerations: None
Published specification: RFC XXXX
Applications that use this media type:
Configuration servers and NETCONF servers.
Fragment identifier considerations: None
Additional information:
Deprecated alias names for this type: N/A
Magic number(s): None
File extension(s): xml
Macintosh file type code(s): 'TEXT'
Person & email address to contact for further information:
Kent Watsen <kwatsen@juniper.net>
Intended usage: COMMON
Restrictions on usage: None
Author:
This specification is a work item of the IETF NETCONF working
group, with mailing list address <netconf@ietf.org>.
Change controller: The IESG <iesg@ietf.org>
Provisional registration? (standards tree only): No
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9.2.2. application/zerotouch-bootimage
Type name: application
Subtype name: zerotouch-bootimage
Required parameters: None
Optional parameters: None
Encoding considerations: binary
Security considerations: See Security Considerations in RFC XXXX
Interoperability considerations: None
Published specification: RFC XXXX
Applications that use this media type:
Configuration servers and NETCONF servers.
Fragment identifier considerations: None
Additional information:
Deprecated alias names for this type: N/A
Magic number(s): None
File extension(s): None
Macintosh file type code(s): N/A
Person & email address to contact for further information:
Kent Watsen <kwatsen@juniper.net>
Intended usage: COMMON
Restrictions on usage: None
Author:
This specification is a work item of the IETF NETCONF working
group, with mailing list address <netconf@ietf.org>.
Change controller: The IESG <iesg@ietf.org>
Provisional registration? (standards tree only): No
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10. Acknowledgements
The authors would like to thank for following for lively discussions
on list and in the halls (ordered by last name): David Harrington,
Dean Bogdanovic, Martin Bjorklund, Wes Hardaker, Russ Mundy, Reinaldo
Penno, Randy Presuhn, Juergen Schoenwaelder.
Special thanks goes to Russ Mundy and Wes Hardaker for brainstorming
the original I-D's solution during the IETF 87 meeting in Berlin.
11. References
11.1. Normative References
[NETCONF-CALL-HOME]
Watsen, K., "NETCONF Call Home (work in progress)",
October 2014, <https://tools.ietf.org/html/draft-ietf-
netconf-call-home-01>.
[NETCONF-SERVER-MODEL]
Watsen, K., "NETCONF Server Model (work in progress)",
September 2014, <http://tools.ietf.org/html/
draft-ietf-netconf-server-model-03>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC6187] Igoe, K. and D. Stebila, "X.509v3 Certificates for Secure
Shell Authentication", RFC 6187, March 2011.
[RFC7317] Bierman, A. and M. Bjorklund, "A YANG Data Model for
System Management", RFC 7317, August 2014.
[Std-802.1AR-2009]
IEEE SA-Standards Board, "IEEE Standard for Local and
metropolitan area networks - Secure Device Identity",
December 2009, <http://standards.ieee.org/findstds/
standard/802.1AR-2009.html>.
[XMLENC] "XML Encryption Syntax and Processing", April 2013,
<http://www.w3.org/TR/xmlenc-core1>.
[XMLSIG] "XML Signature Syntax and Processing", April 2013,
<http://www.w3.org/TR/xmldsig-core1>.
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11.2. Informative References
[TR069] The Broadband Forum, , "TR-069 Amendment 3, CPE WAN
Management Protocol", November 2010,
<http://www.broadband-forum.org/technical/download/
TR-069_Amendment-3.pdf>.
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Appendix A. Examples
A.1. Unsigned Configlet
This example illustrates a Configlet configuring both a local user
account and call home using SSH. Note, this is not a valid Configlet
because it isn't signed.
<?xml version="1.0"?>
<configlet xmlns="urn:ietf:params:xml:ns:ietf-netconf-zerotouch">
<target-requirements>
<unique-identifier>0123456789</unique-identifier>
<software-version>14.1R3.5</software-version>
</target-requirements>
<configuration>
<!-- from ietf-system.yang -->
<system xmlns="urn:ietf:params:xml:ns:yang:ietf-system">
<authentication>
<user>
<name>admin</name>
<ssh-key>
<name>admin's rsa ssh host-key</name>
<algorithm>ssh-rsa</algorithm>
<key-data>AAAAB3NzaC1yc2EAAAADAQABAAABAQDeJMV8zrtsi8CgEsRC
jCzfve2m6zD3awSBPrh7ICggLQvHVbPL89eHLuecStKL3HrEgXaI/O2Mwj
E1lG9YxLzeS5p2ngzK61vikUSqfMukeBohFTrDZ8bUtrF+HMLlTRnoCVcC
WAw1lOr9IDGDAuww6G45gLcHalHMmBtQxKnZdzU9kx/fL3ZS5G76Fy6sA5
vg7SLqQFPjXXft2CAhin8xwYRZy6r/2N9PMJ2Dnepvq4H2DKqBIe340jWq
EIuA7LvEJYql4unq4Iog+/+CiumTkmQIWRgIoj4FCzYkO9NvRE6fOSLLf6
gakWVOZZgQ8929uWjCWlGlqn2mPibp2Go1</key-data>
</ssh-key>
</user>
</authentication>
</system>
<!-- from ietf-netconf-server.yang -->
<netconf-server xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-server">
<call-home>
<application>
<name>config-mgr</name>
<ssh>
<endpoints>
<endpoint>
<name>east-data-center</name>
<address>11.22.33.44</address>
</endpoint>
<endpoint>
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<name>west-data-center</name>
<address>55.66.77.88</address>
</endpoint>
</endpoints>
<host-keys>
<host-key>my-call-home-x509-key</host-key>
</host-keys>
</ssh>
</application>
</call-home>
</netconf-server>
</configuration>
</configlet>
A.2. Signed Configlet
This example illustrates the above unsigned Configlet signed as if by
a Configuration Signer. Note that in addition to the signature
itself, the signed Configlet embeds two certificates, the chain of
certificates from the signer's certificate up to but not including
the trust anchor certificate.
<?xml version="1.0"?>
<configlet xmlns="urn:ietf:params:xml:ns:ietf-netconf-zerotouch">
<target-requirements>
<unique-identifier>0123456789</unique-identifier>
<software-version>14.1R3.5</software-version>
</target-requirements>
<configuration>
<!-- from ietf-system.yang -->
<system xmlns="urn:ietf:params:xml:ns:yang:ietf-system">
<authentication>
<user>
<name>admin</name>
<ssh-key>
<name>admin's rsa ssh host-key</name>
<algorithm>ssh-rsa</algorithm>
<key-data>AAAAB3NzaC1yc2EAAAADAQABAAABAQDeJMV8zrtsi8CgEsRC
jCzfve2m6zD3awSBPrh7ICggLQvHVbPL89eHLuecStKL3HrEgXaI/O2Mwj
E1lG9YxLzeS5p2ngzK61vikUSqfMukeBohFTrDZ8bUtrF+HMLlTRnoCVcC
WAw1lOr9IDGDAuww6G45gLcHalHMmBtQxKnZdzU9kx/fL3ZS5G76Fy6sA5
vg7SLqQFPjXXft2CAhin8xwYRZy6r/2N9PMJ2Dnepvq4H2DKqBIe340jWq
EIuA7LvEJYql4unq4Iog+/+CiumTkmQIWRgIoj4FCzYkO9NvRE6fOSLLf6
gakWVOZZgQ8929uWjCWlGlqn2mPibp2Go1</key-data>
</ssh-key>
</user>
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</authentication>
</system>
<!-- from ietf-netconf-server.yang -->
<netconf-server xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-server">
<call-home>
<application>
<name>config-mgr</name>
<ssh>
<endpoints>
<endpoint>
<name>east-data-center</name>
<address>11.22.33.44</address>
</endpoint>
<endpoint>
<name>west-data-center</name>
<address>55.66.77.88</address>
</endpoint>
</endpoints>
<host-keys>
<host-key>my-call-home-x509-key</host-key>
</host-keys>
</ssh>
</application>
</call-home>
</netconf-server>
</configuration>
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod
Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
<SignatureMethod
Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
<Reference>
<Transforms>
<Transform
Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
</Transforms>
<DigestMethod
Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
<DigestValue>t9OdNsxPsjyzrKu7kO0ydcFK6xU=</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>
AS/dlRNk/DDy2baDfQXspstvQzOxZo/goZ+Z9iiW5dbOZ+wiZwxMlJuMYlxuNrfL
o38JzJ+KnY1XexfRkFmSaaShyMJ0N9kianxaYWJgvF7+/lx5U6isFxpfIwvo9YkQ
27w/i9xb5e/tl+PzVr+FMKyUuyitdy5yjVGpa3y8Gqlk7YSo4df4LWzmR4hAYWTN
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P7cuV516tHakKpyTi9FweBrqEUNT7W7BNb6Js0Q1twrEIR4lFwpQn/iWUM5KqxAu
QzP7YG/d58oWzdILeCXZ2CX3RHhhtm/Brwa9UFN9TFS3D9WLIx1pO+L0HNt5gIiu
eOMq1vN6sazkMtm6Z1NMqg==
</SignatureValue>
<KeyInfo>
<X509Data>
<X509Certificate>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</X509Certificate>
<X509Certificate>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KmORbiKU2GTGZkaCgCjmrWpvrYWLoXv/sf2nPLyK6YjiWsslOJtRO+KzRbs2B18C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</X509Certificate>
</X509Data>
</KeyInfo>
</Signature>
</configlet>
A.3. Encrypted Configlet
This example illustrates the above unsigned Configlet that has been
encrypted using the device's public key. Note, this is not a valid
Configlet because it isn't signed.
<?xml version="1.0"?>
<configlet xmlns="urn:ietf:params:xml:ns:ietf-netconf-zerotouch">
<EncryptedData xmlns="http://www.w3.org/2001/04/xmlenc#"
Type="http://www.w3.org/2001/04/xmlenc#Content">
<EncryptionMethod
Algorithm="http://www.w3.org/2001/04/xmlenc#aes128-cbc"/>
<CipherData>
<CipherValue>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cYwXNgs9Ae3CK+uihxqImY2evRpk1U915n+JMfaf/TRnpK0fIR3MNFbU0WZemMvj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</CipherValue>
</CipherData>
</EncryptedData>
</configlet>
A.4. Signed Encrypted Configlet
This example illstrates the above encrypted Configlet that has been
signed by a Configuration Signer's private key.
<?xml version="1.0"?>
<configlet xmlns="urn:ietf:params:xml:ns:ietf-netconf-zerotouch">
<EncryptedData xmlns="http://www.w3.org/2001/04/xmlenc#"
Type="http://www.w3.org/2001/04/xmlenc#Content">
<EncryptionMethod
Algorithm="http://www.w3.org/2001/04/xmlenc#aes128-cbc"/>
<CipherData>
<CipherValue>
+H4vvrsgkv/qy22JudCE0quMORGamQmnQCaEhLJ7zY1UgP+zS5MbBdrREpocgHPs
W/d9eyDOwdDsREvz2j7V0Vg6NkKuzPJTz2cJVvSoGskWAV0ZwoiwBJqabzxcYErO
yV0DQmyxFruwmR5oalFBxkQzoL7zALfa2pBCpvdGuaoSRKTInQ/24iPOc/u+FNAU
5l0CPKrTNMqPeRx8cGq44nVgcprNi0Fvbg72gAVl8aiYLNA9Vo62Tn5kvvmp/qK2
WieLmBrJHQrvG6n3fg1RSM3cpR0KfsH3uaMEIaVUyzH0aYriwrhpaUPqdWCkel/u
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fTpKUZ3VtVzMtiFaDhgYOtbxeLXD8kj4TCG37G1Sro9iY46yxHkqPHiVUB9lvACG
a5275yu0Z+zNfuCOUlvJtkI1CuSwOde+EOE+fzwyG9uPlacrhY3Xd7cIF9oDKFOf
vKhYp/grnnpzR4MLU1tMz0HHyBm6xI2IU7sKDWztAF0JmYH//kPs3H4boFLXmzmp
xr1eu5npsYpkhNpdflDLetMQZnqydzsmLSX8nfpkWZdkkXkmkKmuk6j1vkRiyw2k
484K71J7096UfMP0t8VhH1ObM8gZLDKXboohnCQEzUAKLKXTm3OWw+QllfJj3cvr
6GSWuKH+80CIUA10WAPNFMKO8VYFcSE68DMr+oXLk8zkXymWJR4ukWuMYa1Y14w6
tx84NuueAYHQUcqzlN0dJaTmbPiFbBRmwRFI5dcLT6t8FK2LybmXvpziFv7StHvY
C1Pr2S0W8lLwLoneaMRZsTNTd8bLzN2MlSuFdO8U6NMRvESH0WmNhF7JhGCzAegc
cYwXNgs9Ae3CK+uihxqImY2evRpk1U915n+JMfaf/TRnpK0fIR3MNFbU0WZemMvj
UYstRVCpAebJHq8L7IMbGjJesyT7vhd6CJIJCQL/4ZeWVp1W8ZPX6iKCpEhG+BhE
2CIvkNu9F8ubpvpdOdvhSs2KABGGK3DF58wJR7CsS516UuqVz+Rl0WlvVjHL9yqc
OvS1AP+NyQGfSLsGQ49tjxPSyE9uRV+dFbY7oCQlzPPdLRQ5H3htS/2CA6gCz0Cu
Ez5uweFPIe8b1k7U0ai3IWTQzxe+LQlcL+MHSgXAKz6yKk3idfpK3JViDtqz8xa5
urIYQDzOGntdjDfTdwG1+o4w/ysFI8zaCVUehL+L0T1pS0FuGwJpoyopg+6dA7rf
GVhcy3OOroAfkAXvZfqZAKTuLCFrN5+vU09iGt7kp1GqeneiaAS75JgG8oAt4SAP
KEIUquo5vxGe8WOXVpV8eByXWSpym/6wfYjwGIgzkIKz44LiqEUvL+Twz5qm3VaF
QHsJVHid/GvcUnk1mfhGtDqHWSv6KhTL2tk1mJ4cJxDzy7ijy75FXoKsDlP7H387
HnEQ/oFR9Xi52NYjylBvq/yuwhY16oGNFqqbq6uv90rdvSv5AJs7a0DxluqH/yd3
BLan1HoRCD8/iuWB2bE74TzhbO30PxuQHWCQPa7zTxJ92/Yn402z1ODUjvhKta4d
M2RTNOgIQwqcTi5qyUqhw+tKuXfQloQ1tIFI2VFwpLz9cEEImxDw+WGdb2bKfz5B
lPJIEbswHr341JqLtejMKm8dvAqkzrmuhJb+tYx5BPHDp1EUjJmzydKs9Up9QcK+
i6pkmK/42jLws5jDAvBiJp6zyaeaSABrRdY06ON7wJ0RLlaAuqecMmW4ZX/rE4oo
MIARa6SQ5JhV8Y7Z7/XWlids/GHfn9cYDIXIIadhz63a2s18qk3Ql8NAJ+CgkyiE
02h4cCjlJ/e+tpyW83XdeqvGy9tdhRir/iZh6i7iRsAQTltq/yGiR7lWQqwzMtUD
G994qckZ5PAZiKWHrB7/aWXTCDoHW1J546A5TsMcYGkIJR2UPOhFYWyOL1zCg6fG
Ehv8pO+r3CfO4vldMY4Z6Uw7mCs9c/5nrgOz7wLPPILjRoUIJ7SzknJHzqPFjG+R
Wqou6kQY6fy96Kax/iPGarfVbPJPhTJWWnxLD8NZWm8b12LViKJK6dAAl5REn3rK
om+EQVfxo/uuiLP/YAwcLwq/apURH89dDtHMiA4fh4cEY0POqwTiLm3xD0+AIaj7
lU7zbEIsKpz6HK5ex5dWsUADecIGBOyuQf//OO4E8vMO73NrSNiKA0mDPizzXCwk
UhNK2DjEZalduWlv273wFSebHM1wIiisatQIxzhwsWFuTgQJRb7/JPZGsXEg6npp
ePRShAqzrUAVOc7/flAvlNRLmOrdssqTZvmh2nFvyMeTHFoJ3BXbahxC+cNlvaWf
v0ebL2Hk7m3cntAOjuIE0ejGkqbb/6APHgYqRGRVdTmPnYq/lwohnSHcrhGmYvkL
5gk2DiSiffIpB/IJuTBQZQ==
</CipherValue>
</CipherData>
</EncryptedData>
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod
Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
<SignatureMethod
Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
<Reference>
<Transforms>
<Transform
Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
</Transforms>
<DigestMethod
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Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
<DigestValue>c7b+PFEoC9cVoQKKuLUQMhuHZik=</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>
G0vUKL9FZYu7YIk88+wvHRRAFoKjdU7Mqp8CZvTSrKHTErjPGuJCMOUpvE9uCdpq
5U8Y6LmpZxz7gUIFhWdSk0rpGpEsG7sRrrl64ZuSb4y0Z3lVVg/4CuaYpoLDGrNn
JpupwKI4DlfexXt/a9TyIWvb3gjBuN+4wPc87nQRqkX6uwOP8Qh7sKpB8lGDrbTT
AORhuzitJA9I3DI89he8IrLn6AF7YXYrE97RuP51eZ0/lIVn1M2fDQJtNqOs1poW
mPf9+TDjgELOMKhW2GF/UNXvM+QP5lInFU8mHxV62qx4NVvmoABzj11P7WM/BEqm
Lwlk1Qow470JH1xOyDeAuQ==
</SignatureValue>
<KeyInfo>
<X509Data>
<X509Certificate>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</configlet>
Appendix B. Change Log
B.1. ID to 00
o Major structural update; the essence is the same. Most every
section was rewritten to some degree.
o Added a Use Cases section
o Added diagrams for "Actors and Roles" and "NMS Precondition"
sections, and greatly improved the "Device Boot Sequence" diagram
o Removed support for physical presence or any ability for
Configlets to not be signed.
o Defined the ZeroTouch Information DHCP option
o Added an ability for devices to also download images from
Configuration Servers
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o Added an ability for Configlets to be encrypted
o Now Configuration Servers only have to support HTTP/S - no other
schemes possible
B.2. 00 to 01
o Added boot-image and validate-owner annotations to the "Actors and
Roles" diagram.
o Fixed 2nd paragrph in section 7.1 to reflect current use of
anyxml.
o Added encrypted and signed-encrypted examples
o Replaced YANG module with XSD schema
o Added IANA request for the ZeroTouch Information DHCP Option
o Added IANA request for media types for boot-image and
configuration
Authors' Addresses
Kent Watsen
Juniper Networks
EMail: kwatsen@juniper.net
Stephen Hanna
Juniper Networks
EMail: shanna@juniper.net
Joe Marcus Clarke
Cisco Systems
EMail: jclarke@cisco.com
Mikael Abrahamsson
T-Systems
EMail: "mikael.abrahamsson@t-systems.se
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