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module ietf-tpm-remote-attestation {
namespace "urn:ietf:params:xml:ns:yang:ietf-tpm-remote-attestation";
prefix "tpm";
import ietf-yang-types {
prefix yang;
}
import ietf-hardware {
prefix ietfhw;
}
import ietf-crypto-types {
prefix ietfct;
}
organization
"IETF RATS (Remote ATtestation procedureS) Working Group";
contact
"WG Web : <http://datatracker.ietf.org/wg/rats/>
WG List : <mailto:[email protected]>
Author : Henk Birkholz <[email protected]>
Author : Michael Eckel <[email protected]>
Author : Shwetha Bhandari <[email protected]>
Author : Bill Sulzen <[email protected]>
Author : Eric Voit <[email protected]>
Author : Liang Xia (Frank) <[email protected]>
Author : Tom Laffey <[email protected]>
Author : Guy Fedorkow <[email protected]>";
description
"A YANG module to enable a TPM 1.2 and TPM 2.0 based
remote attestation procedure using a challenge-response
interaction model and the TPM 1.2 and TPM 2.0 Quote
primitive operations.
Copyright (c) 2020 IETF Trust and the persons identified
as authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with
or without modification, is permitted pursuant to, and
subject to the license terms contained in, the Simplified
BSD License set forth in Section 4.c of the IETF Trust's
Legal Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info).
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject to
the license terms contained in, the Simplified BSD License set
forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://www.rfc-editor.org/info/rfcXXXX); see the RFC
itself for full legal notices.
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 (RFC 2119)
(RFC 8174) when, and only when, they appear in all
capitals, as shown here.";
revision "2020-06-05" {
description
"Initial version";
reference
"draft-ietf-rats-yang-tpm-charra";
}
/*****************/
/* Features */
/*****************/
feature TPM12 {
description
"This feature indicates that an Attester includes cryptoprocessors
capable of supporting the TPM 1.2 API.";
}
feature TPM20 {
description
"This feature indicates that an Attester includes cryptoprocessors
capable of supporting the TPM 2 API.";
}
/*****************/
/* Typedefs */
/*****************/
typedef pcr {
type uint8 {
range "0..31";
}
description
"Valid index number for a PCR. At this point 0-31 is viable.";
}
typedef compute-node-ref {
type leafref {
path "/tpm:rats-support-structures/tpm:compute-nodes/tpm:node-name";
}
description
"This type is used to reference a hardware node. It is quite possible
this leafref will eventually point to another YANG module's node.";
}
/******************/
/* Identities */
/******************/
identity attested-event-log-type {
description
"Base identity allowing categorization of the reasons why and
attested measurement has been taken on an Attester.";
}
identity ima {
base attested-event-log-type;
description
"An event type recorded in IMA.";
}
identity bios {
base attested-event-log-type;
description
"An event type associated with BIOS/UEFI.";
}
identity cryptoprocessor {
description
"Base identity identifying a crytoprocessor.";
}
identity tpm12 {
base cryptoprocessor;
description
"A cryptoprocessor capable of supporting the TPM 1.2 API.";
}
identity tpm20 {
base cryptoprocessor;
description
"A cryptoprocessor capable of supporting the TPM 2.0 API.";
}
/*****************/
/* Groupings */
/*****************/
grouping TPM2_ALG_ID {
description
"The signature scheme that is used to sign the TPM2 Quote
information response.";
leaf TPM2_ALG_ID {
type enumeration {
enum RSA {
value 1;
description
"RFC 3447 - the RSA algorithm";
}
enum SHA1 {
value 4;
description
"ISO/IEC 10118-3 - SHA1 algorithm";
}
enum HMAC {
value 5;
description
"ISO/IEC 9797-2 - Hash Message Authentication Code (HMAC)
algorithm";
}
enum AES {
value 6;
description
"ISO/IEC 18033-3 - the AES algorithm";
}
enum MGF1 {
value 7;
description
"IEEE Std 1363a -2004 - hash-based mask-generation function";
}
enum KEYEDHASH {
value 8;
description
"TPM2 KEYEDHASH - an encryption or signing algorithm using
a keyed hash";
}
enum XOR {
value 10;
description
"TPM2 XOR";
}
enum SHA256 {
value 11;
description
"ISO/IEC 10118-3 - the SHA 256 algorithm";
}
enum SHA384 {
value 12;
description
"ISO/IEC 10118-3 - the SHA 384 algorithm";
}
enum SHA512 {
value 13;
description
"ISO/IEC 10118-3 - the SHA 512 algorithm";
}
enum NULL {
value 16;
description
"TPM2 NULL";
}
enum SM3_256 {
value 18;
description
"GM/T 0004-2012 - SM3_256";
}
enum SM4 {
value 19;
description
"GM/T 0004-2012 - SM4 symmetric block cipher";
}
enum RSASSA {
value 20;
description
"RFC 3447 - defined in section 8.2 (RSASSAPKCS1-v1_5)";
}
enum RSAES {
value 21;
description
"RFC 3447 - defined in section 7.2 (RSAES-PKCS1-v1_5)";
}
enum RSAPSS {
value 22;
description
"RFC 3447 - defined in section 8.1 (RSASSA PSS)";
}
enum OAEP {
value 23;
description
"RFC 3447 - defined in section 7.1 (RSASSA OAEP)";
}
enum ECDSA {
value 24;
description
"ISO/IEC 14888-3 - elliptic curve cryptography (ECC)";
}
enum ECDH {
value 25;
description
"NIST SP800-56A - secret sharing using ECC";
}
enum ECDAA {
value 26;
description
"TPM2 - elliptic-curve based anonymous signing scheme";
}
enum SM2 {
value 27;
description
"A GM/T 0003.1–2012, GM/T 0003.2–2012, GM/T 0003.3–2012,
GM/T 0003.5–2012 SM2";
}
enum ECSCHNORR {
value 28;
description
"TPM2 - elliptic-curve based Schnorr signature";
}
enum ECMQV {
value 29;
description
"NIST SP800-56A - two-phase elliptic-curve key";
}
enum KDF1_SP800_56A {
value 32;
description
"NIST SP800-56A - concatenation key derivation function,
(approved alternative1) section 5.8.1";
}
enum KDF2 {
value 33;
description
"IEEE 1363a-2004 - key derivation function KDF2 section 13.2";
}
enum KDF1_SP800_108 {
value 34;
description
"NIST SP800-108 - Section 5.1 KDF in Counter Mode";
}
enum ECC {
value 35;
description
"ISO/IEC 15946-1 - prime field ECC";
}
enum SYMCIPHER {
value 37;
description
"TPM2 - object type for a symmetric block cipher";
}
enum CAMELLIA {
value 38;
description
"ISO/IEC 18033-3 - the Camellia algorithm";
}
enum CTR {
value 64;
description
"ISO/IEC 10116 - Counter mode";
}
enum OFB {
value 65;
description
"ISO/IEC 10116 - Output Feedback mode";
}
enum CBC {
value 66;
description
"ISO/IEC 10116 - Cipher Block Chaining mode";
}
enum CFB {
value 67;
description
"ISO/IEC 10116 - Cipher Feedback mode";
}
enum ECB {
value 68;
description
"ISO/IEC 10116 - Electronic Codebook mode";
}
}
default "RSA";
description
"The signature scheme that is used to sign the TPM
Quote information response.";
reference
"TPM-Rev-2.0-Part-2-Structures-01.38.pdf
The TCG Algorithm Registry ID value. Table 9";
}
}
grouping hash-algo {
description
"A selector for the hashing algorithm";
choice algo-registry-type {
mandatory true;
description
"Unfortunately, both IETF and TCG have registries here.
Choose your weapon wisely.";
case tcg {
description
"You chose the east door, the tcg space opens up to
you.";
uses TPM2_ALG_ID;
}
case ietf {
description
"You chose the west door, the ietf space opens up to
you.";
leaf ietf-ni-hash-algo-id {
type uint8;
description
"This is an index referencing the Named Information
Hash Algorithm Registry.";
}
}
}
}
grouping hash {
description
"The hash value including hash-algo identifier";
list hash-digests {
description
"The list of hashes.";
container hash-digest {
description
"A hash value based on a hash algorithm registered by an
SDO.";
uses hash-algo;
leaf hash-value {
type binary;
description
"The binary representation of the hash value.";
}
}
}
}
grouping nonce {
description
"A nonce to show freshness and counter replays.";
leaf nonce-value {
type binary;
mandatory true;
description
"This nonce SHOULD be generated via a registered
cryptographic-strength algorithm. In consequence,
the length of the nonce depends on the hash algorithm
used. The algorithm used in this case is independent
from the hash algorithm used to create the hash-value
in the response of the attestor.";
}
}
grouping tpm12-pcr-selection {
description
"A Verifier can request one or more PCR values using its
individually created Attestation Key Certificate (AC).
The corresponding selection filter is represented in this
grouping.
Requesting a PCR value that is not in scope of the AC used,
detailed exposure via error msg should be avoided.";
leaf-list pcr-index {
type pcr;
description
"The numbers/indexes of the PCRs. At the moment this is limited
to 32.";
}
}
grouping tpm20-pcr-selection {
description
"A Verifier can request the generation of an attestation
certificate (a signed public attestation key
(non-migratable, tpm-resident) wrt one or more PCR values.
The corresponding creation input is represented in this grouping.
Requesting a PCR value that is not supported results in an error,
detailed exposure via error msg should be avoided.";
list pcr-list {
description
"For each PCR in this list an individual hash-algo can be requested.";
container pcr {
description
"The composite of a PCR number and corresponding bank numbers.";
leaf-list pcr-index {
type pcr;
description
"The numbers of the PCRs that are associated with
the created key.";
}
uses hash-algo;
}
}
}
grouping tpm12-signature-scheme {
description
"The signature scheme used to sign the evidence via a TPM 1.2.";
leaf TPM_SIG_SCHEME-value {
type enumeration {
enum NONE {
value 1;
description
"TPM_SS_NONE.";
}
enum SHA1 {
value 2;
description
"TPM_SS_RSASSAPKCS1v15_SHA1";
}
enum DER {
value 3;
description
"TPM_SS_RSASSAPKCS1v15_DER";
}
enum INFO {
value 4;
description
"TPM_SS_RSASSAPKCS1v15_INFO";
}
}
default "NONE";
description
"Selects the signature scheme that is used to sign the TPM
Quote information response.";
reference
"TPM-Main-Part-2-TPM-Structures_v1.2_rev116_01032011.pdf
Allowed values can be found in
the table at the bottom of page 32 in the TPM 1.2 Structures
specification (Level 2 Revision 116, 1 March 2011).";
}
}
grouping tpm20-signature-scheme {
description
"The signature scheme used to sign the evidence.";
choice signature-identifier-type {
mandatory true;
description
"There are multiple ways to reference a signature type.
This used to select the signature algo to sign the quote
information response.";
case TPM_ALG_ID {
description
"This references the indices of table 9 in the TPM 2.0
structure specification.";
uses TPM2_ALG_ID;
}
case COSE_Algorithm {
description
"This references the IANA COSE Algorithms Registry indices.
Every index of this registry to be used must be mapable to a
TPM2_ALG_ID value.";
leaf COSE_Algorithm-value {
type int32;
description
"The IANA COSE Algorithms ID value.";
reference
"https://www.iana.org/assignments/cose/cose.xhtml#algorithms";
/* Need to decide if these become enums. */
}
}
}
}
grouping tpm12-attestation-key-identifier {
description
"A selector for a suitable key identifier for a TPM 1.2.";
choice key-identifier {
description
"Identifier for the attestation key to use for signing
attestation evidence.";
case public-key {
leaf pub-key-id {
type binary;
description
"The value of the identifier for the public key.";
}
}
case TSS_UUID {
description
"Use a YANG agent generated (and maintained) attestation
key UUID that complies with the TSS_UUID datatype of the TCG
Software Stack (TSS) Specification, Version 1.10 Golden,
August 20, 2003.";
container TSS_UUID-value {
description
"A detailed structure that is used to create the
TPM 1.2 native TSS_UUID as defined in the TCG Software
Stack (TSS) Specification, Version 1.10 Golden,
August 20, 2003.";
leaf ulTimeLow {
type uint32;
description
"The low field of the timestamp.";
}
leaf usTimeMid {
type uint16;
description
"The middle field of the timestamp.";
}
leaf usTimeHigh {
type uint16;
description
"The high field of the timestamp multiplexed with the
version number.";
}
leaf bClockSeqHigh {
type uint8;
description
"The high field of the clock sequence multiplexed with
the variant.";
}
leaf bClockSeqLow {
type uint8;
description
"The low field of the clock sequence.";
}
leaf-list rgbNode {
type uint8;
description
"The spatially unique node identifier.";
}
}
}
}
}
grouping tpm20-attestation-key-identifier {
description
"A selector for a suitable key identifier.";
choice key-identifier {
description
"Identifier for the attestation key to use for signing
attestation evidence.";
case public-key {
leaf pub-key-id {
type binary;
description
"The value of the identifier for the public key.";
}
}
case uuid {
description
"Use a YANG agent generated (and maintained) attestation
key UUID.";
leaf uuid-value {
type binary;
description
"The UUID identifying the corresponding public key.";
}
}
}
}
grouping certificate-name {
description
"An arbitrary name for the identity certificate chain requested.";
leaf certificate-name {
type string;
description
"An arbitrary name for the identity certificate chain requested.";
}
}
grouping tpm-name {
description
"Path to a unique TPM on a device.";
leaf tpm-name {
type string;
description
"Unique system generated name for a TPM on a device.";
}
}
grouping tpm-name-selector {
description
"One or more TPM on a device.";
leaf-list tpm-name {
type string;
config false;
description
"Name of one or more unique TPMs on a device. If this object exists,
a selection should pull only the objects related to these TPM(s). If
it does not exist, all qualifying TPMs that are 'hardware-based'
equals true on the device are selected.";
}
}
grouping compute-node-identifier {
description
"In a distributed system with multiple compute nodes
this is the node identified by name and physical-index.";
leaf node-id {
type string;
description
"ID of the compute node, such as Board Serial Number.";
}
leaf node-physical-index {
if-feature ietfhw:entity-mib;
type int32 {
range "1..2147483647";
}
config false;
description
"The entPhysicalIndex for the compute node.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalIndex";
}
}
grouping tpm12-pcr-info-short {
description
"This structure is for defining a digest at release when the only
information that is necessary is the release configuration.";
uses tpm12-pcr-selection;
leaf locality-at-release {
type uint8;
description
"This SHALL be the locality modifier required to release the
information (TPM 1.2 type TPM_LOCALITY_SELECTION)";
}
leaf digest-at-release {
type binary;
description
"This SHALL be the digest of the PCR indices and PCR values
to verify when revealing auth data (TPM 1.2 type
TPM_COMPOSITE_HASH).";
}
}
grouping tpm12-version {
description
"This structure provides information relative the version of
the TPM.";
list version {
description
"This indicates the version of the structure
(TPM 1.2 type TPM_STRUCT_VER). This MUST be 1.1.0.0.";
leaf major {
type uint8;
description
"Indicates the major version of the structure.
MUST be 0x01.";
}
leaf minor {
type uint8;
description
"Indicates the minor version of the structure.
MUST be 0x01.";
}
leaf revMajor {
type uint8;
description
"Indicates the rev major version of the structure.
MUST be 0x00.";
}
leaf revMinor {
type uint8;
description
"Indicates the rev minor version of the structure.
MUST be 0x00.";
}
}
}
grouping tpm12-quote-info-common {
description
"These statements are used in bot quote variants of the TPM 1.2";
leaf fixed {
type binary;
description
"This SHALL always be the string 'QUOT' or 'QUO2'
(length is 4 bytes).";
}
leaf external-data {
type binary;
description
"160 bits of externally supplied data, typically a nonce.";
}
leaf signature-size {
type uint32;
description
"The size of TPM 1.2 'signature' value.";
}
leaf signature {
type binary;
description
"Signature over SHA-1 hash of tpm12-quote-info2'.";
}
}
grouping tpm12-quote-info {
description
"This structure provides the mechanism for the TPM to quote the
current values of a list of PCRs (as used by the TPM_Quote2
command).";
uses tpm12-version;
leaf digest-value {
type binary;
description
"This SHALL be the result of the composite hash algorithm using
the current values of the requested PCR indices
(TPM 1.2 type TPM_COMPOSITE_HASH.)";
}
}
grouping tpm12-quote-info2 {
description
"This structure provides the mechanism for the TPM to quote the
current values of a list of PCRs
(as used by the TPM_Quote2 command).";
leaf tag {
type uint8;
description
"This SHALL be TPM_TAG_QUOTE_INFO2.";
}
uses tpm12-pcr-info-short;
}
grouping tpm12-cap-version-info {
description
"TPM returns the current version and revision of the TPM 1.2 .";
list TPM_PCR_COMPOSITE {
description
"The TPM 1.2 TPM_PCRVALUEs for the pcr-indices.";
uses tpm12-pcr-selection;
leaf value-size {
type uint32;
description
"This SHALL be the size of the 'tpm12-pcr-value' field
(not the number of PCRs).";
}
leaf-list tpm12-pcr-value {
type binary;
description
"The list of TPM_PCRVALUEs from each PCR selected in sequence
of tpm12-pcr-selection.";
}
list version-info {
description
"An optional output parameter from a TPM 1.2 TPM_Quote2.";
leaf tag {
type uint16;
description
"The TPM 1.2 version and revision
(TPM 1.2 type TPM_STRUCTURE_TAG).
This MUST be TPM_CAP_VERSION_INFO (0x0030)";
}
uses tpm12-version;
leaf spec-level {
type uint16;
description
"A number indicating the level of ordinals supported.";
}
leaf errata-rev {
type uint8;
description
"A number indicating the errata version of the
specification.";
}
leaf tpm-vendor-id {
type binary;
description
"The vendor ID unique to each TPM manufacturer.";
}
leaf vendor-specific-size {
type uint16;
description
"The size of the vendor-specific area.";
}
leaf vendor-specific {
type binary;
description
"Vendor specific information.";
}
}
}
}
grouping tpm12-pcr-composite {
description
"The actual values of the selected PCRs (a list of TPM_PCRVALUEs
(binary) and associated metadata for TPM 1.2.";
list TPM_PCR_COMPOSITE {
description
"The TPM 1.2 TPM_PCRVALUEs for the pcr-indices.";
uses tpm12-pcr-selection;
leaf value-size {
type uint32;
description
"This SHALL be the size of the 'tpm12-pcr-value' field
(not the number of PCRs).";
}
leaf-list tpm12-pcr-value {
type binary;
description
"The list of TPM_PCRVALUEs from each PCR selected in sequence
of tpm12-pcr-selection.";
}
}
}
grouping node-uptime {
description
"Uptime in seconds of the node.";
leaf up-time {
type uint32;
description
"Uptime in seconds of this node reporting its data";
}
}
grouping tpm12-attestation {
description
"Contains an instance of TPM1.2 style signed cryptoprocessor
measurements. It is supplemented by unsigned Attester information.";
uses certificate-name;
uses node-uptime;
uses compute-node-identifier;
uses tpm12-quote-info-common;
choice tpm12-quote {
mandatory true;
description
"Either a tpm12-quote-info or tpm12-quote-info2, depending
on whether TPM_Quote or TPM_Quote2 was used
(cf. input field add-verson).";
case tpm12-quote1 {
description
"BIOS/UEFI event logs";
uses tpm12-quote-info;
uses tpm12-pcr-composite;
}
case tpm12-quote2 {
description
"BIOS/UEFI event logs";
uses tpm12-quote-info2;
}
}
}
grouping tpm20-attestation {
description
"Contains an instance of TPM2 style signed cryptoprocessor
measurements. It is supplemented by unsigned Attester information.";
uses certificate-name;
uses node-uptime;
uses compute-node-identifier;
leaf quote {
type binary;
description
"Quote data returned by TPM Quote, including PCR selection,
PCR digest and etc.";
}
leaf quote-signature {
type binary;
description
"Quote signature returned by TPM Quote.";
}
list pcr-bank-values {
description
"PCR values in each PCR bank."; /* THIS IS NOT CORRECT */
uses hash-algo;
list pcr-values {
key pcr-index;
description
"List of one PCR bank.";
leaf pcr-index {
type uint16;
description
"PCR index number.";
}
leaf pcr-value {
type binary;
description
"PCR value.";
}
}
}
container pcr-digest-algo-in-quote {
uses hash-algo;
description
"The hash algorithm for PCR value digest in Quote output.";
}
}
grouping log-identifier {
description
"Identifier for type of log to be retrieved.";
leaf log-type {
type identityref {
base attested-event-log-type;
}
mandatory true;
description
"The corresponding measurement log type identity.";
}
}
grouping boot-event-log {
description
"Defines an event log corresponding to the event that extended the
PCR";
leaf event-number {
type uint32;
description
"Unique event number of this event";
}
leaf event-type {
type uint32;
description
"log event type";
}
leaf pcr-index {
type uint16;
description
"Defines the PCR index that this event extended";
}
list digest-list {
description "Hash of event data";
uses hash-algo;
leaf-list digest {
type binary;
description
"The hash of the event data";
}
}
leaf event-size {
type uint32;
description
"Size of the event data";
}
leaf-list event-data {
type uint8;
description
"The event data size determined by event-size";
}
}
grouping ima-event {
description
"Defines an hash log extend event for IMA measurements";
leaf event-number {
type uint64;
description
"Unique number for this event for sequencing";