Internet DRAFT - draft-moran-suit-update-management
draft-moran-suit-update-management
SUIT B. Moran
Internet-Draft Arm Limited
Intended status: Standards Track 26 October 2021
Expires: 29 April 2022
Update Management Extensions for Software Updates for Internet of Things
(SUIT) Manifests
draft-moran-suit-update-management-00
Abstract
This specification describes extensions to the SUIT manifest format
defined in [I-D.ietf-suit-manifest]. These extensions allow an
update author, update distributor or device operator to more
precisely control the distribution and installation of updates to IoT
devices. These extensions also provide a mechanism to inform a
management system of Software Identifier and Software Bill Of
Materials information about an updated device.
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 https://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 29 April 2022.
Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
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This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://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 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 . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions and Terminology . . . . . . . . . . . . . . . . . 3
3. Extension Metadata . . . . . . . . . . . . . . . . . . . . . 3
3.1. suit-coswid . . . . . . . . . . . . . . . . . . . . . . . 3
3.2. text-version-required . . . . . . . . . . . . . . . . . . 4
4. Extension Parameters . . . . . . . . . . . . . . . . . . . . 4
4.1. suit-parameter-use-before . . . . . . . . . . . . . . . . 5
4.2. suit-parameter-minimum-battery . . . . . . . . . . . . . 5
4.3. suit-parameter-update-priority . . . . . . . . . . . . . 5
4.4. suit-parameter-version . . . . . . . . . . . . . . . . . 5
4.5. suit-parameter-wait-info . . . . . . . . . . . . . . . . 7
5. Extension Commands . . . . . . . . . . . . . . . . . . . . . 8
5.1. suit-condition-use-before . . . . . . . . . . . . . . . . 9
5.2. suit-condition-image-not-match . . . . . . . . . . . . . 9
5.3. suit-condition-minimum-battery . . . . . . . . . . . . . 10
5.4. suit-condition-update-authorized . . . . . . . . . . . . 10
5.5. suit-condition-version . . . . . . . . . . . . . . . . . 10
5.6. suit-directive-wait . . . . . . . . . . . . . . . . . . . 10
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
6.1. SUIT Commands . . . . . . . . . . . . . . . . . . . . . . 11
6.2. SUIT Parameters . . . . . . . . . . . . . . . . . . . . . 11
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.1. Normative References . . . . . . . . . . . . . . . . . . 12
8.2. Informative References . . . . . . . . . . . . . . . . . 12
Appendix A. A. Full CDDL . . . . . . . . . . . . . . . . . . . 13
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction
Full management of software updates for unattended, connected
devices, such as Internet of Things devices requires a cooperation
between the update author(s) and management, distribution, policy
enforcement, and auditing systems. This specification provides the
extensions to the SUIT manifest ([I-D.ietf-suit-manifest]) that
enable an author to coordinate with these other systems. These
extensions enable authors to instruct devices to examine update
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priority, local update authorisation, update lifetime, and system
properties. They also enable devices to report and distributors to
collect Software Bill of Materials information.
Extensions in this specification are OPTIONAL to implment and
OPTIONAL to include in manifests unless otherwise designated.
2. Conventions and Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
Additionally, the following terminology is used throughout this
document:
* SUIT: Software Update for the Internet of Things, also the IETF
working group for this standard.
3. Extension Metadata
Some additional metadata makes management of SUIT updates easier: a
CoSWID can enable a
3.1. suit-coswid
suit-coswid is a member of the suit-manifest. It contains a Concise
Software Identifier (CoSWID) as defined in [I-D.ietf-sacm-coswid].
This element SHOULD be made severable so that it can be discarded by
the Recipient or an intermediary if it is not required by the
Recipient.
suit-coswid typically requires no processing by the Recipient.
However all Recipients MUST NOT fail if a suit-coswid is present.
suit-coswid is RECOMMENDED to implement and RECOMMENDED to include in
manifests.
TODO: CoRIM might be a preferable alternative to CoSWID. TODO:
Should CoMID be offered as an alternative to Vendor ID/Class ID?
TODO: Should there be a CoMID namespace identifier for UUIDs?
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3.2. text-version-required
suit-text-version-required is used to represent a version-based
dependency on suit-parameter-version as described in Section 4.4 and
Section 5.5. To describe a version dependency, a Manifest Author
SHOULD populate the suit-text map with a SUIT_Component_Identifier
key for the dependency component, and place in the corresponding map
a suit-text-version-required key with a free text expression that is
representative of the version constraints placed on the dependency.
This text SHOULD be expressive enough that a device operator can be
expected to understand the dependency. This is a free text field and
there are no specific formatting rules.
By way of example only, to express a dependency on a component "['x',
'y']", where the version should be any v1.x later than v1.2.5, but
not v2.0 or above, the author would add the following structure to
the suit-text element. Note that this text is in cbor-diag notation.
[h'78',h'79'] : {
7 : ">=1.2.5,<2"
}
4. Extension Parameters
Several parameters are needed to define the behaviour of the commands
specified in Section 5. These parameters follow the same
considerations as defined in SUIT_Parameters of
[I-D.ietf-suit-manifest]
+=================+================================+=============+
| Name | CDDL Structure | Reference |
+=================+================================+=============+
| Use Before | suit-parameter-use-before | Section 4.1 |
+-----------------+--------------------------------+-------------+
| Minimum Battery | suit-parameter-minimum-battery | Section 4.2 |
+-----------------+--------------------------------+-------------+
| Update Priority | suit-parameter-update-priority | Section 4.3 |
+-----------------+--------------------------------+-------------+
| Version | suit-parameter-version | Section 4.4 |
+-----------------+--------------------------------+-------------+
| Wait Info | suit-parameter-wait-info | Section 4.5 |
+-----------------+--------------------------------+-------------+
Table 1
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4.1. suit-parameter-use-before
An expiry date for the use of the manifest encoded as the positive
integer number of seconds since 1970-01-01. Implementations that use
this parameter MUST use a 64-bit internal representation of the
integer. Used with Section 5.1
4.2. suit-parameter-minimum-battery
This parameter sets the minimum battery level in mWh. This parameter
is encoded as a positive integer. Used with suit-condition-minimum-
battery (Section 5.3).
4.3. suit-parameter-update-priority
This parameter sets the priority of the update. This parameter is
encoded as an integer. It is used along with suit-condition-update-
authorized (Section 5.4) to ask an application for permission to
initiate an update. This does not constitute a privilege inversion
because an explicit request for authorization has been provided by
the Update Authority in the form of the suit-condition-update-
authorized command.
Applications MAY define their own meanings for the update priority.
For example, critical reliability & vulnerability fixes MAY be given
negative numbers, while bug fixes MAY be given small positive
numbers, and feature additions MAY be given larger positive numbers,
which allows an application to make an informed decision about
whether and when to allow an update to proceed.
4.4. suit-parameter-version
Indicates allowable versions for the specified component. Allowable
versions can be specified, either with a list or with range matching.
This parameter is compared with version asserted by the current
component when suit-condition-version (Section 5.5) is invoked. The
current component may assert the current version in many ways,
including storage in a parameter storage database, in a metadata
object, or in a known location within the component itself.
The component version can be compared as:
* Greater.
* Greater or Equal.
* Equal.
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* Lesser or Equal.
* Lesser.
Versions are encoded as a CBOR list of integers. Comparisons are
done on each integer in sequence. Comparison stops after all
integers in the list defined by the manifest have been consumed OR
after a non-equal match has occurred. For example, if the manifest
defines a comparison, "Equal [1]", then this will match all version
sequences starting with 1. If a manifest defines both "Greater or
Equal [1,0]" and "Lesser [1,10]", then it will match versions 1.0.x
up to, but not including 1.10.
While the exact encoding of versions is application-defined, semantic
versions map conveniently. For example,
* 1.2.3 = [1,2,3].
* 1.2-rc3 = [1,2,-1,3].
* 1.2-beta = [1,2,-2].
* 1.2-alpha = [1,2,-3].
* 1.2-alpha4 = [1,2,-3,4].
suit-condition-version is OPTIONAL to implement.
Versions SHOULD be provided as follows:
1. The first integer represents the major number. This indicates
breaking changes to the component.
2. The second integer represents the minor number. This is
typically reserved for new features or large, non-breaking
changes.
3. The third integer is the patch version. This is typically
reserved for bug fixes.
4. The fourth integer is the build number.
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Where Alpha (-3), Beta (-2), and Release Candidate (-1) are used,
they are inserted as a negative number between Minor and Patch
numbers. This allows these releases to compare correctly with final
releases. For example, Version 2.0, RC1 should be lower than Version
2.0.0 and higher than any Version 1.x. By encoding RC as -1, this
works correctly: [2,0,-1,1] compares as lower than [2,0,0].
Similarly, beta (-2) is lower than RC and alpha (-3) is lower than
RC.
4.5. suit-parameter-wait-info
suit-directive-wait (Section 5.6) directs the manifest processor to
pause until a specified event occurs. The suit-parameter-wait-info
encodes the parameters needed for the directive.
The exact implementation of the pause is implementation-defined. For
example, this could be done by blocking on a semaphore, registering
an event handler and suspending the manifest processor, polling for a
notification, or aborting the update entirely, then restarting when a
notification is received.
suit-parameter-wait-info is encoded as a map of wait events. When
ALL wait events are satisfied, the Manifest Processor continues. The
wait events currently defined are described in the following table.
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+======================+==========+==========================+
| Name | Encoding | Description |
+======================+==========+==========================+
| suit-wait-event- | int | Same as suit-parameter- |
| authorization | | update-priority |
+----------------------+----------+--------------------------+
| suit-wait-event- | int | Wait until power state |
| power | | |
+----------------------+----------+--------------------------+
| suit-wait-event- | int | Wait until network state |
| network | | |
+----------------------+----------+--------------------------+
| suit-wait-event- | See | Wait for other device to |
| other-device-version | below | match version |
+----------------------+----------+--------------------------+
| suit-wait-event-time | uint | Wait until time (seconds |
| | | since 1970-01-01) |
+----------------------+----------+--------------------------+
| suit-wait-event- | uint | Wait until seconds since |
| time-of-day | | 00:00:00 |
+----------------------+----------+--------------------------+
| suit-wait-event- | uint | Wait until seconds since |
| time-of-day-utc | | 00:00:00 UTC |
+----------------------+----------+--------------------------+
| suit-wait-event-day- | uint | Wait until days since |
| of-week | | Sunday |
+----------------------+----------+--------------------------+
| suit-wait-event-day- | uint | Wait until days since |
| of-week-utc | | Sunday UTC |
+----------------------+----------+--------------------------+
Table 2
suit-wait-event-other-device-version reuses the encoding of suit-
parameter-version-match. It is encoded as a sequence that contains
an implementation-defined bstr identifier for the other device, and a
list of one or more SUIT_Parameter_Version_Match.
5. Extension Commands
The following table defines the semantics of the commands defined in
this specification in the same way as in the Abstract Machine
Description, Section 6.4, of [I-D.ietf-suit-manifest].
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+=============+=================+===============================+
| Command | CDDL Identifier | Semantic of the Operation |
| Name | | |
+=============+=================+===============================+
| Use Before | suit-condition- | assert(now() < |
| | use-before | current.params[use-before]) |
+-------------+-----------------+-------------------------------+
| Check Image | suit-condition- | assert(not binary- |
| Not Match | image-not-match | match(digest(current), |
| | | current.params[digest])) |
+-------------+-----------------+-------------------------------+
| Check | suit-condition- | assert(battery >= |
| Minimum | minimum-battery | current.params[minimum- |
| Battery | | battery]) |
+-------------+-----------------+-------------------------------+
| Check | suit-condition- | assert( isAuthorized( |
| Update | update- | current.params[priority])) |
| Authorized | authorized | |
+-------------+-----------------+-------------------------------+
| Check | suit-condition- | assert(version_check(current, |
| Version | version | current.params[version])) |
+-------------+-----------------+-------------------------------+
| Wait For | suit-directive- | until event(arg), wait |
| Event | wait | |
+-------------+-----------------+-------------------------------+
Table 3
5.1. suit-condition-use-before
Verify that the current time is BEFORE the specified time. suit-
condition-use-before is used to specify the last time at which an
update should be installed. The recipient evaluates the current time
against the suit-parameter-use-before parameter (Section 4.1), which
must have already been set as a parameter, encoded as seconds after
1970-01-01 00:00:00 UTC. Timestamp conditions MUST be evaluated in
64 bits, regardless of encoded CBOR size. suit-condition-use-before
is OPTIONAL to implement.
5.2. suit-condition-image-not-match
Verify that the current component does not match the suit-parameter-
image-digest (Section 8.4.8.6 of [I-D.ietf-suit-manifest]). If no
digest is specified, the condition fails. suit-condition-image-not-
match is OPTIONAL to implement.
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5.3. suit-condition-minimum-battery
suit-condition-minimum-battery provides a mechanism to test a
Recipient's battery level before installing an update. This
condition is primarily for use in primary-cell applications, where
the battery is only ever discharged. For batteries that are charged,
suit-directive-wait is more appropriate, since it defines a "wait"
until the battery level is sufficient to install the update. suit-
condition-minimum-battery is specified in mWh. suit-condition-
minimum-battery is OPTIONAL to implement. suit-condition-minimum-
battery consumes suit-parameter-minimum-battery (Section 4.2).
5.4. suit-condition-update-authorized
Request Authorization from the application and fail if not
authorized. This can allow a user to decline an update. suit-
parameter-update-priority (Section 4.3) provides an integer priority
level that the application can use to determine whether or not to
authorize the update. Priorities are application defined. suit-
condition-update-authorized is OPTIONAL to implement.
5.5. suit-condition-version
suit-condition-version allows comparing versions of firmware.
Verifying image digests is preferred to version checks because
digests are more precise. suit-condition-version examines a
component's version against the version info specified in suit-
parameter-version (Section 4.4)
5.6. suit-directive-wait
suit-directive-wait directs the manifest processor to pause until a
specified event occurs. Some possible events include:
1. Authorization
2. External Power
3. Network availability
4. Other Device Firmware Version
5. Time
6. Time of Day
7. Day of Week
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6. IANA Considerations
IANA is requested to:
* allocate key 14 in the SUIT Envelope registry for suit-coswid
* allocate key 14 in the SUIT Manifest registry for suit-coswid
* allocate key 7 in the SUIT Component Text registry for suit-text-
version-required
* allocate the commands and parameters as shown in the following
tables
6.1. SUIT Commands
+=======+===================+=============+
| Label | Name | Reference |
+=======+===================+=============+
| 4 | Use Before | Section 5.1 |
+-------+-------------------+-------------+
| 25 | Image Not Match | Section 5.2 |
+-------+-------------------+-------------+
| 26 | Minimum Battery | Section 5.3 |
+-------+-------------------+-------------+
| 27 | Update Authorized | Section 5.4 |
+-------+-------------------+-------------+
| 28 | Version | Section 5.5 |
+-------+-------------------+-------------+
| 29 | Wait For Event | Section 5.6 |
+-------+-------------------+-------------+
Table 4
6.2. SUIT Parameters
+=======+=================+=============+
| Label | Name | Reference |
+=======+=================+=============+
| 4 | Use Before | Section 4.1 |
+-------+-----------------+-------------+
| 26 | Minimum Battery | Section 4.2 |
+-------+-----------------+-------------+
| 27 | Update Priority | Section 4.3 |
+-------+-----------------+-------------+
| 28 | Version | Section 4.4 |
+-------+-----------------+-------------+
| 29 | Wait Info | Section 4.5 |
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+-------+-----------------+-------------+
Table 5
7. Security Considerations
This document extends the SUIT manifest specification. A detailed
security treatment can be found in the architecture [RFC9019] and in
the information model [I-D.ietf-suit-information-model] documents.
8. References
8.1. Normative References
[I-D.ietf-sacm-coswid]
Birkholz, H., Fitzgerald-McKay, J., Schmidt, C., and D.
Waltermire, "Concise Software Identification Tags", Work
in Progress, Internet-Draft, draft-ietf-sacm-coswid-19, 20
October 2021, <https://www.ietf.org/archive/id/draft-ietf-
sacm-coswid-19.txt>.
[I-D.ietf-suit-manifest]
Moran, B., Tschofenig, H., Birkholz, H., and K. Zandberg,
"A Concise Binary Object Representation (CBOR)-based
Serialization Format for the Software Updates for Internet
of Things (SUIT) Manifest", Work in Progress, Internet-
Draft, draft-ietf-suit-manifest-14, 12 July 2021,
<https://www.ietf.org/archive/id/draft-ietf-suit-manifest-
14.txt>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC9019] Moran, B., Tschofenig, H., Brown, D., and M. Meriac, "A
Firmware Update Architecture for Internet of Things",
RFC 9019, DOI 10.17487/RFC9019, April 2021,
<https://www.rfc-editor.org/info/rfc9019>.
8.2. Informative References
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[I-D.ietf-suit-information-model]
Moran, B., Tschofenig, H., and H. Birkholz, "A Manifest
Information Model for Firmware Updates in IoT Devices",
Work in Progress, Internet-Draft, draft-ietf-suit-
information-model-13, 8 July 2021,
<https://www.ietf.org/archive/id/draft-ietf-suit-
information-model-13.txt>.
Appendix A. A. Full CDDL
To be valid, the following CDDL MUST be appended to the SUIT Manifest
CDDL. The SUIT CDDL is defined in Appendix A of
[I-D.ietf-suit-manifest]
$$SUIT_severable-members-extensions //= (
suit-coswid => bstr .cbor concise-software-identity)
$$severable-manifest-members-choice-extensions //= (
suit-coswid => bstr .cbor SUIT_Command_Sequence / SUIT_Digest
)
SUIT_Condition //= (
suit-condition-image-not-match, SUIT_Rep_Policy)
SUIT_Condition //= (
suit-condition-use-before, SUIT_Rep_Policy)
SUIT_Condition //= (
suit-condition-minimum-battery, SUIT_Rep_Policy)
SUIT_Condition //= (
suit-condition-update-authorized, SUIT_Rep_Policy)
SUIT_Condition //= (
suit-condition-version, SUIT_Rep_Policy)
SUIT_Directive //= (
suit-directive-wait, SUIT_Rep_Policy)
SUIT_Wait_Event = { + SUIT_Wait_Events }
SUIT_Wait_Events //= (suit-wait-event-authorization => int)
SUIT_Wait_Events //= (suit-wait-event-power => int)
SUIT_Wait_Events //= (suit-wait-event-network => int)
SUIT_Wait_Events //= (suit-wait-event-other-device-version
=> SUIT_Wait_Event_Argument_Other_Device_Version)
SUIT_Wait_Events //= (suit-wait-event-time => uint); Timestamp
SUIT_Wait_Events //= (suit-wait-event-time-of-day
=> uint); Time of Day (seconds since 00:00:00)
SUIT_Wait_Events //= (suit-wait-event-day-of-week
=> uint); Days since Sunday
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SUIT_Wait_Event_Argument_Other_Device_Version = [
other-device: bstr,
other-device-version: [ + SUIT_Parameter_Version_Match ]
]
SUIT_Parameters //= (suit-parameter-use-before => uint)
SUIT_Parameters //= (suit-parameter-minimum-battery => uint)
SUIT_Parameters //= (suit-parameter-update-priority => uint)
SUIT_Parameters //= (suit-parameter-version =>
SUIT_Parameter_Version_Match)
SUIT_Parameters //= (suit-parameter-wait-info =>
bstr .cbor SUIT_Wait_Event)
SUIT_Parameter_Version_Match = [
suit-condition-version-comparison-type:
SUIT_Condition_Version_Comparison_Types,
suit-condition-version-comparison-value:
SUIT_Condition_Version_Comparison_Value
]
SUIT_Condition_Version_Comparison_Types /=
suit-condition-version-comparison-greater
SUIT_Condition_Version_Comparison_Types /=
suit-condition-version-comparison-greater-equal
SUIT_Condition_Version_Comparison_Types /=
suit-condition-version-comparison-equal
SUIT_Condition_Version_Comparison_Types /=
suit-condition-version-comparison-lesser-equal
SUIT_Condition_Version_Comparison_Types /=
suit-condition-version-comparison-lesser
suit-condition-version-comparison-greater = 1
suit-condition-version-comparison-greater-equal = 2
suit-condition-version-comparison-equal = 3
suit-condition-version-comparison-lesser-equal = 4
suit-condition-version-comparison-lesser = 5
SUIT_Condition_Version_Comparison_Value = [+int]
$$suit-text-component-key-extensions //= (
suit-text-version-required => tstr)
suit-coswid = 14
suit-condition-use-before = 4
suit-condition-image-not-match = 25
suit-condition-minimum-battery = 26
suit-condition-update-authorized = 27
suit-condition-version = 28
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suit-directive-wait = 29
suit-wait-event-authorization = 1
suit-wait-event-power = 2
suit-wait-event-network = 3
suit-wait-event-other-device-version = 4
suit-wait-event-time = 5
suit-wait-event-time-of-day = 6
suit-wait-event-day-of-week = 7
suit-parameter-use-before = 4
suit-parameter-minimum-battery = 26
suit-parameter-update-priority = 27
suit-parameter-version = 28
suit-parameter-wait-info = 29
suit-text-version-required = 7
Author's Address
Brendan Moran
Arm Limited
Email: Brendan.Moran@arm.com
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