Content for TS 24.109 Word version: 18.0.0

1 Scope p. 7

The present document defines stage 3 for the HTTP Digest AKA as specified in RFC 3310 based implementation of Ub interface (UE-BSF), the Disposable-Ks model based implementation of Upa interface (NAF-UE) and the HTTP Digest as specified in RFC 7616 and the PSK TLS based implementation of bootstrapped security association usage over Ua interface (UE-NAF) in Generic Authentication Architecture (GAA) as specified in TS 33.220. The purpose of the Ub interface is to create a security association between UE and BSF for further usage in GAA applications. The purpose of the Upa interface is to provide a push mechanism to created a bootstrapped security association between the UE and NAF for secure communication of pushed messages. The purpose of the Ua interface is to use the so created bootstrapped security association between UE and NAF for secure communication.

The present document also defines stage 3 for the Authentication Proxy usage as specified in TS 33.222.

The present document also defines stage 3 for the subscriber certificate enrolment as specified in TS 33.221 which is one realization of the Ua interface. The subscriber certificate enrolment uses the HTTP Digest based implementation of bootstrapped security association usage to enrol a subscriber certificate and the delivery of a CA certificate.

The present document also defines stage 3 for TLS using AKMA (Authentication and Key Management for Applications) keys over the Ua* interface (AKMA AF-UE) as described in TS 33.535.

2 References p. 7

The following documents contain provisions, which, through reference in this text, constitute provisions of the present document.

References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[1]

TS 33.220: "Generic Authentication Architecture (GAA); Generic bootstrapping architecture".

[2]

TR 33.919: "Generic Authentication Architecture (GAA); System description".

[3]

TS 29.109: "Generic Authentication Architecture (GAA); Zh and Zn Interfaces based on the Diameter protocol; Protocol details".

[4]

TS 33.221: "Generic Authentication Architecture (GAA); Support for Subscriber Certificates".

[5]

TS 33.222: "Generic Authentication Architecture (GAA); Access to network application functions using Hypertext Transfer Protocol over Transport Layer Security (HTTPS)".

[6]

RFC 3310: "Hypertext Transfer Protocol (HTTP) Digest Authentication Using Authentication and Key Agreement (AKA)".

[7]

TS 23.003: "Numbering, addressing and identification".

[8]

RFC 3023: "XML Media Types".

[9] Void.

[10] Void.

[11] Void.

[12] Void.

[13]

TS 24.228: Release 5: "Signalling flows for the IP multimedia call control based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".

[14] Void.

[15] Void.

[16]

PKCS#10 v1.7: "Certification Request Syntax Standard". ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-10/pkcs-10v1_7.pdf

[17]

WAP Forum "WPKI: Wireless Application Protocol; Public Key Infrastructure Definition": http://www1.wapforum.org/tech/documents/WAP-217-WPKI-20010424-a.pdf.

[18] Void.

[19]

Open Mobile Alliance "ECMAScript Crypto Object": http://www.openmobilealliance.org.

[20]

Open Mobile Alliance "WPKI": http://member.openmobilealliance.org/ftp/public_documents/SEC/Permanent_documents/.

[21]

TS 33.203: "3G security; Access security for IP-based services".

[22]

RFC 2234: "Augmented BNF for Syntax Specifications: ABNF".

[23] Void.

[24]

TS 33.223: "Generic Authentication Architecture (GAA); Generic Bootstrapping Architecture (GBA) Push function".

[25]

TS 33.310: "Network Domain Security (NDS); Authentication Framework (AF)".

[26]

Open Mobile Alliance Push Enabler Release v2.2: "Push Over the Air". http://www.openmobilealliance.org/Technical/release_program/push_v2_2.aspx.

[27]

Open Mobile Alliance Push Enabler Releasev 2.2: "Push Message Specification". http://www.openmobilealliance.org/Technical/release_program/push_v2_2.aspx.

[28]

Open Mobile Alliance Device Management Enabler Release v1.2: "Enabler Release Definition for OMA Device Management". http://www.openmobilealliance.org/Technical/release_program/dm_v1_2.aspx.

[29]

TS 33.303: "Proximity-based Services (ProSe); Security aspects".

[30]

RFC 9112: "HTTP/1.1".

[31]

RFC 9110: "HTTP Semantics".

[32] Void.

[33] Void.

[34]

RFC 9111: "HTTP Caching".

[35] Void.

[36]

RFC 7616: "HTTP Digest Access Authentication".

[37]

RFC 4648: "The Base16, Base32, and Base64 Data Encodings".

[38]

TS 33.535: "Authentication and Key Management for Applications (AKMA) based on 3GPP credentials in the 5G System (5GS)".

3 Definitions and abbreviations p. 9

3.1 Definitions p. 9

For the purposes of the present document, the following terms and definitions apply.

Bootstrapping information:

set of parameters that have been established during bootstrapping procedure. The information consists of a bootstrapping transaction identifier (B-TID), key material (Ks), and a group of application specific security parameters related to the subscriber.

Bootstrapped security association:

association between a UE and a BSF that is established by running bootstrapping procedure between them. The association is identified by a bootstrapping transaction identifier (B-TID) and consists of bootstrapping information.

CA certificate:

The Certificate Authority public key is itself contained within a certificate, called a CA certificate. The CA sign all certificates that it issues with the private key that corresponds to the public key in the CA certificate.

Delivery of CA certificate:

procedure during which UE requests a root certificate from PKI portal, who delivers the certificate to the UE. The procedure is secured by using GBA.

PKI portal:

certification authority (or registration authority) operated by a cellular operator

Reverse proxy:

a reverse proxy is a gateway for servers, and enables one server (i.e., reverse proxy) to provide content from another server transparently, e.g., when UE's request for a particular information is received at a reverse proxy, the reverse proxy is configured to request the information from another server. The reverse proxy functionality is transparent to the UE, i.e., the UE does not know that the request is being forwarded to another server by the reverse proxy.

Root certificate:

a certificate that an entity explicitly trusts, typically a self-signed CA certificate

Subscriber certificate:

certificate issued to a subscriber. It contains the subscriber's own public key and possibly other information such as the subscriber's identity in some form.

Subscriber certificate enrolment:

procedure during which UE sends certification request to PKI portal and who issues a certificate to UE. The procedure is secured by using GBA.

WAP Identity Module (WIM):

used in performing WTLS, TLS, and application level security functions, and especially, to store and process information needed for user identification and authentication The WPKI may use the WIM for secure storage of certificates and keys (see TS 33.221, OMA ECMAScript [19], and OMA WPKI [20] specifications).

For the purposes of the present document, the following terms and definitions given in TS 33.220 apply:

Temporary IP Multimedia Private Identity

For the purposes of the present document, the following terms and definitions given in TS 33.223 apply:

Disposable-Ks model

Push-message

Push-NAF

3.2 Abbreviations p. 9

For the purposes of the present document, the following abbreviations apply:

A-KID

AKMA Key IDentifier

AKA

Authentication and Key Agreement

AKMA

Authentication and Key Management for Applications

Authentication Proxy

Application Server

AUTN

Authentication Token

AUTS

Re-synchronisation Token

Authentication Vector

BSF

BootStrapping Function

B-TID

Bootstrapping - Transaction IDentifier

Certification Authority

Confidentiality Key

DER

Distinquished Encoding Rules

FQDN

Fully Qualified Domain Name

GAA

Generic Authentication Architecture

GBA

Generic Bootstrapping Architecture

GBA_ME

ME-based GBA

GBA_U

GBA with UICC-based enhancements

GPI

GBA Push Info

GUSS

GBA User Security Settings

HSS

Home Subscriber System

HTTP

Hypertext Transfer Protocol

HTTPS

HTTP over TLS

Integrity Key

IMPI

IP Multimedia Private Identity

IMPU

IP Multimedia PUblic identity

Key material

Ks_NAF

NAF specific key material

MAC

Message Authentication Code

Mobile Equipment

NAF

Network Application Function

PKCS

Public-Key Cryptography Standards

PKI

Public Key Infrastructure

PSK

Pre-Shared Secret

RAND

RANDom challenge

RES

authentication Response

Security Association

SQN

SeQuence Number

TLS

Transport Layer Security

TMPI

Temporary IP Multimedia Private Identity

User Equipment

UICC

Universal Integrated Circuit Card

URI

Uniform Resource Identifier

URN

Uniform Resource Name

USIM

User Service Identity Module

USS

User Security Settings

UTC

Coordinated Universal Time

WIM

Wireless Identity Module

WPKI

Wireless PKI

WTLS

Wireless Transport Layer Security

XRES

Expected authentication response