X.509 Certificate Extension for 5G Network Function Types
draft-ietf-lamps-5g-nftypes-06

Network Working Group                                         R. Housley
Internet-Draft                                            Vigil Security
Intended status: Standards Track                               S. Turner
Expires: 22 April 2023                                             sn3rd
                                                          J. P. Mattsson
                                                              D. Migault
                                                                Ericsson
                                                         19 October 2022

       X.509 Certificate Extension for 5G Network Function Types
                     draft-ietf-lamps-5g-nftypes-06

Abstract

   This document specifies the certificate extension for including
   Network Function Types (NFTypes) for the 5G System in X.509v3 public
   key certificates as profiled in RFC 5280.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on 22 April 2023.

Copyright Notice

   Copyright (c) 2022 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
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   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Network Functions Certificate Extension . . . . . . . . . . .   3
   4.  ASN.1 Module  . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  NFType Strings . . . . . . . . . . . . . . . . . . .   7
   Appendix B.  Example Certificate Containing a NFTypes
           Extension . . . . . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   The 3rd Generation Partnership Project (3GPP) has specified several
   Network Functions (NFs) as part of the service-based architecture
   within the 5G System.  There are 49 NF Types defined in for 3GPP
   Release 17; they are listed in Table 6.1.6.3.3-1 of [TS29.510], and
   each NF type is identified by a short ASCII string.

   Operators of 5G systems make use of an internal PKI to identify
   interface instances in the NFs in a 5G system.  X.509v3 public key
   certificates [RFC5280] are used, and the primary function of a
   certificate is to bind a public key to the identity of an entity that
   holds the corresponding private key, known as the certificate
   subject.  The certificate subject and the subjectAltName certificate
   extension can be used to support identity-based access control
   decisions.

   This document specifies the NFTypes certificate extension to support
   role-based access control decisions by providing a list of NF Types
   associated with the certificate subject.  The NFTypes certificate
   extension can be used by operators of 5G systems or later.

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2.  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.

3.  Network Functions Certificate Extension

   This section specifies the NFTypes certificate extension, which
   provides a list of NF Types associated with the certificate subject.

   The NFTypes certificate extension MAY be included in public key
   certificates [RFC5280].  The NFTypes certificate extension MUST be
   identified by the following object identifier:

     id-pe-nftypes  OBJECT IDENTIFIER  ::=
        { iso(1) identified-organization(3) dod(6) internet(1)
          security(5) mechanisms(5) pkix(7) id-pe(1) 34 }

   This extension MUST NOT be marked critical.

   The NFTypes extension MUST have the following syntax:

     NFTypes ::= SEQUENCE SIZE (1..MAX) OF NFType

     NFType ::= IA5String (SIZE (1..32))

   The NFTypes MUST contain at least one NFType.

   The NFTypes MUST NOT contain the same NFType more than once.

   Each NFType MUST contain only an ASCII string; however, the string
   MUST NOT include control characters (values 0 through 31), the space
   character (value 32), or the delete character (value 127).

   Each NFType MUST contain at least one ASCII character and MUST NOT
   contain more than 32 ASCII characters.

   The NFType uses the IA5String type to permit inclusion of the
   underscore character ('_'), which is not part of the PrintableString
   character set.

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4.  ASN.1 Module

   This section provides an ASN.1 module [X.680] for the NFTypes
   certificate extension, and it follows the conventions established in
   [RFC5912] and [RFC6268].

   <CODE BEGINS>
     NFTypeCertExtn
       { iso(1) identified-organization(3) dod(6) internet(1)
         security(5) mechanisms(5) pkix(7) id-mod(0)
         id-mod-nftype(106) }

     DEFINITIONS IMPLICIT TAGS ::=
     BEGIN

     IMPORTS
       EXTENSION
       FROM PKIX-CommonTypes-2009  -- RFC 5912
         { iso(1) identified-organization(3) dod(6) internet(1)
           security(5) mechanisms(5) pkix(7) id-mod(0)
           id-mod-pkixCommon-02(57) } ;

     -- NFTypes Certificate Extension

     ext-NFType EXTENSION ::= {
       SYNTAX NFTypes
       IDENTIFIED BY id-pe-nftype }

     -- NFTypes Certificate Extension OID

     id-pe-nftype  OBJECT IDENTIFIER  ::=
        { iso(1) identified-organization(3) dod(6) internet(1)
          security(5) mechanisms(5) pkix(7) id-pe(1) 34 }

     -- NFTypes Certificate Extension Syntax

     NFTypes ::= SEQUENCE SIZE (1..MAX) OF NFType

     NFType ::= IA5String (SIZE (1..32))

     END
   <CODE ENDS>

5.  Security Considerations

   The Security Considerations of [RFC5280] are applicable to this
   document.

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   Some of the ASCII strings that specify the NF Types are standard.
   See Appendix A for values defined in 3GPP.  Additionally, an operator
   MAY assign its own NF Types for use in their own network.  Since the
   NF Type is used for role-based access control decisions, an operator-
   assigned NF Type MUST NOT overlap with a value already defined in the
   commonly defined set.  Use of the same ASCII string by two different
   operators for different roles could lead to confusion or incorrect
   access control decisions.  The mechanism for an operator to determine
   whether an ASCII string associated with a NF Type is unique across
   operators is outside the scope of this document.

   The certificate extension supports many different forms of role-based
   access control to support the diversity of activities that NFs are
   trusted to perform in the overall system.  Different levels of
   confidence that the NFTypes are proper assigned might be needed to
   contribute to the overall security of the 5G system.  For example,
   more confidence might be needed to make access control decisions
   related to a scarce resource than implementation of filtering
   policies.  As a result, different operators might have different
   trust models for NFTypes certificate extension.

6.  Privacy Considerations

   In some security protocols, such as TLS 1.2 [RFC5246], certificates
   are exchanged in the clear.  In other security protocols, such as TLS
   1.3 [RFC8446], the certificates are encrypted.  The inclusion of
   NFType certificate extension can help an observer determine which
   systems are of most interest based on the plaintext certificate
   transmission.

7.  IANA Considerations

   For the NFType certificate extension in Section 3, IANA is requested
   to assign an object identifier (OID) for the certificate extension.
   The OID for the certificate extension should be allocated in the "SMI
   Security for PKIX Certificate Extension" registry (1.3.6.1.5.5.7.1).

   For the ASN.1 Module in Section 4, IANA is requested to assign an
   object identifier (OID) for the module identifier.  The OID for the
   module should be allocated in the "SMI Security for PKIX Module
   Identifier" registry (1.3.6.1.5.5.7.0).

8.  Acknowledgements

   Many thanks to Ben Smeets, Michael Li, Tim Hollebeek, and Roman
   Danyliw for their review, comments, and assistance.

9.  References

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9.1.  Normative References

   [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>.

   [RFC5280]  Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
              Housley, R., and W. Polk, "Internet X.509 Public Key
              Infrastructure Certificate and Certificate Revocation List
              (CRL) Profile", RFC 5280, DOI 10.17487/RFC5280, May 2008,
              <https://www.rfc-editor.org/info/rfc5280>.

   [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>.

   [TS23.003] 3rd Generation Partnership Project, "Technical
              Specification Group Core Network and Terminals; Numbering,
              addressing and identification (Release 17)", 3GPP
              TS:23.003 V17.5.0 , March 2022,
              <https://www.3gpp.org/ftp/Specs/
              archive/23_series/23.003/23003-h50.zip>.

   [TS29.510] 3rd Generation Partnership Project, "5G System; Network
              Function Repository Services; Stage 3 (Release 17)", 3GPP
              TS:29.510 V17.5.0 , March 2022,
              <https://www.3gpp.org/ftp/Specs/
              archive/29_series/29.510/29510-h50.zip>.

   [TS33.310] 3rd Generation Partnership Project, "Network Domain
              Security (NDS); Authentication Framework (AF) (Release
              17)", 3GPP TS:33.310 V17.2.0 , March 2022,
              <https://www.3gpp.org/ftp/Specs/
              archive/33_series/33.310/33310-h20.zip>.

   [X.680]    ITU-T, "Information technology -- Abstract Syntax Notation
              One (ASN.1): Specification of basic notation", ITU-T
              Recommendation X.680, ISO/IEC 8824-1:2021, February 2021,
              <https://www.itu.int/rec/T-REC-X.680>.

9.2.  Informative References

   [RFC5246]  Dierks, T. and E. Rescorla, "The Transport Layer Security
              (TLS) Protocol Version 1.2", RFC 5246,
              DOI 10.17487/RFC5246, August 2008,
              <https://www.rfc-editor.org/info/rfc5246>.

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   [RFC5912]  Hoffman, P. and J. Schaad, "New ASN.1 Modules for the
              Public Key Infrastructure Using X.509 (PKIX)", RFC 5912,
              DOI 10.17487/RFC5912, June 2010,
              <https://www.rfc-editor.org/info/rfc5912>.

   [RFC6268]  Schaad, J. and S. Turner, "Additional New ASN.1 Modules
              for the Cryptographic Message Syntax (CMS) and the Public
              Key Infrastructure Using X.509 (PKIX)", RFC 6268,
              DOI 10.17487/RFC6268, July 2011,
              <https://www.rfc-editor.org/info/rfc6268>.

   [RFC8446]  Rescorla, E., "The Transport Layer Security (TLS) Protocol
              Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
              <https://www.rfc-editor.org/info/rfc8446>.

   [TS29.571] 3rd Generation Partnership Project, "5G System; Common
              Data Types for Service Based Interfaces; Stage 3 (Release
              17)", 3GPP TS:29.571 V17.5.0 , March 2022,
              <https://www.3gpp.org/ftp/Specs/
              archive/29_series/29.571/29571-h50.zip>.

Appendix A.  NFType Strings

   Table 6.1.6.3.3-1 of [TS29.510] defines the ASCII strings for the NF
   Types specified in 3GPP documents, which are listed below in
   alphabetical order.  This list is not exhaustive.

       "5G_DDNMF"        "ICSCF"           "SCEF"
       "5G_EIR"          "IMS_AS"          "SCP"
       "AANF"            "LMF"             "SCSAS"
       "ADRF"            "MB-SMF"          "SCSCF"
       "AF"              "MB-UPF"          "SEPP"
       "AMF"             "MFAF"            "SMF"
       "AUSF"            "MME"             "SMSF"
       "BSF"             "N3IWF"           "SOR_AF"
       "CBCF"            "NEF"             "SPAF"
       "CEF"             "NRF"             "TSCTSF"
       "CHF"             "NSACF"           "UCMF"
       "DCCF"            "NSSAAF"          "UDM"
       "DRA"             "NSSF"            "UDR"
       "EASDF"           "NSWOF"           "UDSF"
       "GBA_BSF"         "NWDAF"           "UPF"
       "GMLC"            "PCF"
       "HSS"             "PCSCF"

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Appendix B.  Example Certificate Containing a NFTypes Extension

   The example certificate conformes to certificate profile in
   Table 6.1.3c.3-1 of [TS33.310].  In addition, the NFTypes certificate
   is included with only one NFType, and it is "AMF".  The
   SubjectAltName certificate extension contains a fully qualified
   domain names (FQDN) and a uniformResourceIdentifier, which carries
   the NF Instance ID as specified in Clause 5.3.2 of [TS29.571].

   -----BEGIN CERTIFICATE-----
   MIIC0DCCAlagAwIBAgIUbZoY923zOE0+ZIkjG4ehhCGoVXYwCgYIKoZIzj0EAwMw
   FTETMBEGA1UECgwKRXhhbXBsZSBDQTAeFw0yMjEwMTkxNjMyMzZaFw0yMzEwMTkx
   NjMyMzZaMDkxCzAJBgNVBAYTAlVTMSowKAYDVQQKEyE1Z2MubW5jNDAwLm1jYzMx
   MS4zZ3BwbmV0d29yay5vcmcwdjAQBgcqhkjOPQIBBgUrgQQAIgNiAATJ6IFHI683
   q/JJjsJUfEiRFqGQ6uKDGJ0oqDP6wEhRAuvyEyz5pgRmz/7Mze1+s1qcnPU9mo1v
   rIW9rjKhb/Hm8H9TPvnMQwCRCtKvCD90MkWvc/G8qyCBpCms3zNOJOijggFBMIIB
   PTATBggrBgEFBQcBIgQHMAUWA0FNRjAXBgNVHSAEEDAOMAwGCmCGSAFlAwIBMDAw
   DgYDVR0PAQH/BAQDAgeAMBMGA1UdJQQMMAoGCCsGAQUFBwMBMB0GA1UdDgQWBBRM
   Z5KgwYlYn885mKID55ZcEznIBzAfBgNVHSMEGDAWgBSIf6IE6QtqjXR2+p/xCtRh
   4PqzNTAxBgNVHR8EKjAoMCagJKAihiBodHRwOi8vZXhhbXBsZS5jb20vZXhhbXBs
   ZWNhLmNybDB1BgNVHREBAf8EazBpgjhhbWYxLmNsdXN0ZXIxLm5ldDIuYW1mLjVn
   Yy5tbmM0MDAubWNjMzExLjNncHBuZXR3b3JrLm9yZ4YtdXJuOnV1aWQ6ZjgxZDRm
   YWUtN2RlYy0xMWQwLWE3NjUtMDBhMGM5MWU2YmY2MAoGCCqGSM49BAMDA2gAMGUC
   MQDCBp4Fb/1/ffZGEVDWdx1XeFjg1KEmfnBGkNC+GHtan1gbnBnDIfD1MD0ctWWf
   /zQCMDUmAAk2gM3QohfVsfhGQBm1N2hRz34oHSfhIH+EJFW1rSIG/93r27j09x5C
   SG8e0g==
   -----END CERTIFICATE-----

   The following shows the example certificate.  The values on the left
   are the ASN.1 tag (in hexadecimal) and the length (in decimal).

   30 720: SEQUENCE {
   30 598:  SEQUENCE {
   A0   3:   [0] {
   02   1:    INTEGER 2
         :     }
   02  20:   INTEGER
         :    6D 9A 18 F7 6D F3 38 4D 3E 64 89 23 1B 87 A1 84
         :    21 A8 55 76
   30  10:   SEQUENCE {
   06   8:    OBJECT IDENTIFIER ecdsaWithSHA384 (1 2 840 10045 4 3 3)
         :     }
   30  21:   SEQUENCE {
   31  19:    SET {
   30  17:     SEQUENCE {
   06   3:      OBJECT IDENTIFIER organizationName (2 5 4 10)
   0C  10:      UTF8String 'Example CA'
         :       }

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         :      }
         :     }
   30  30:   SEQUENCE {
   17  13:    UTCTime 19/10/2022 16:32:36 GMT
   17  13:    UTCTime 19/10/2023 16:32:36 GMT
         :     }
   30  57:   SEQUENCE {
   31  11:    SET {
   30   9:     SEQUENCE {
   06   3:      OBJECT IDENTIFIER countryName (2 5 4 6)
   13   2:      PrintableString 'US'
         :       }
         :      }
   31  42:    SET {
   30  40:     SEQUENCE {
   06   3:      OBJECT IDENTIFIER organizationName (2 5 4 10)
   13  33:      PrintableString '5gc.mnc400.mcc311.3gppnetwork.org'
         :       }
         :      }
         :     }
   30 118:   SEQUENCE {
   30  16:    SEQUENCE {
   06   7:     OBJECT IDENTIFIER ecPublicKey (1 2 840 10045 2 1)
   06   5:     OBJECT IDENTIFIER secp384r1 (1 3 132 0 34)
         :      }
   03  98:    BIT STRING
         :     04 C9 E8 81 47 23 AF 37 AB F2 49 8E C2 54 7C 48
         :     91 16 A1 90 EA E2 83 18 9D 28 A8 33 FA C0 48 51
         :     02 EB F2 13 2C F9 A6 04 66 CF FE CC CD ED 7E B3
         :     5A 9C 9C F5 3D 9A 8D 6F AC 85 BD AE 32 A1 6F F1
         :     E6 F0 7F 53 3E F9 CC 43 00 91 0A D2 AF 08 3F 74
         :     32 45 AF 73 F1 BC AB 20 81 A4 29 AC DF 33 4E 24
         :     E8
         :     }
   A3 321:   [3] {
   30 317:    SEQUENCE {
   30  19:     SEQUENCE {
   06   8:      OBJECT IDENTIFIER nfTypes (1 3 6 1 5 5 7 1 34)
   04   7:      OCTET STRING, encapsulates {
   30   5:       SEQUENCE {
   16   3:        IA5String 'AMF'
         :         }
         :        }
         :       }
   30  23:     SEQUENCE {
   06   3:      OBJECT IDENTIFIER certificatePolicies (2 5 29 32)
   04  16:      OCTET STRING, encapsulates {
   30  14:       SEQUENCE {

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   30  12:        SEQUENCE {
   06  10:         OBJECT IDENTIFIER '2 16 840 1 101 3 2 1 48 48'
         :          }
         :         }
         :        }
         :       }
   30  14:     SEQUENCE {
   06   3:      OBJECT IDENTIFIER keyUsage (2 5 29 15)
   01   1:      BOOLEAN TRUE
   04   4:      OCTET STRING, encapsulates {
   03   2:       BIT STRING 7 unused bits
         :        '1'B (bit 0)
         :        }
         :       }
   30  19:     SEQUENCE {
   06   3:      OBJECT IDENTIFIER extKeyUsage (2 5 29 37)
   04  12:      OCTET STRING, encapsulates {
   30  10:       SEQUENCE {
   06   8:        OBJECT IDENTIFIER serverAuth (1 3 6 1 5 5 7 3 1)
         :         }
         :        }
         :       }
   30  29:     SEQUENCE {
   06   3:      OBJECT IDENTIFIER subjectKeyIdentifier (2 5 29 14)
   04  22:      OCTET STRING, encapsulates {
   04  20:       OCTET STRING
         :        4C 67 92 A0 C1 89 58 9F CF 39 98 A2 03 E7 96 5C
         :        13 39 C8 07
         :        }
         :       }
   30  31:     SEQUENCE {
   06   3:      OBJECT IDENTIFIER authorityKeyIdentifier (2 5 29 35)
   04  24:      OCTET STRING, encapsulates {
   30  22:       SEQUENCE {
   80  20:        [0]
         :        88 7F A2 04 E9 0B 6A 8D 74 76 FA 9F F1 0A D4 61
         :        E0 FA B3 35
         :         }
         :        }
         :       }
   30  49:     SEQUENCE {
   06   3:      OBJECT IDENTIFIER cRLDistributionPoints (2 5 29 31)
   04  42:      OCTET STRING, encapsulates {
   30  40:       SEQUENCE {
   30  38:        SEQUENCE {
   A0  36:         [0] {
   A0  34:          [0] {
   86  32:           [6] 'http://example.com/exampleca.crl'

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         :            }
         :           }
         :          }
         :         }
         :        }
         :       }
   30 117:     SEQUENCE {
   06   3:      OBJECT IDENTIFIER subjectAltName (2 5 29 17)
   01   1:      BOOLEAN TRUE
   04 107:      OCTET STRING, encapsulates {
   30 105:       SEQUENCE {
   82  56:        [2]
         :         'amf1.cluster1.net2.amf.5gc.mnc400.mcc311.3gppnet'
         :         'work.org'
   86  45:        [6]
         :         'urn:uuid:f81d4fae-7dec-11d0-a765-00a0c91e6bf6'
         :         }
         :        }
         :       }
         :      }
         :     }
         :    }
   30  10:  SEQUENCE {
   06   8:   OBJECT IDENTIFIER ecdsaWithSHA384 (1 2 840 10045 4 3 3)
         :    }
   03 104:  BIT STRING, encapsulates {
   30 101:   SEQUENCE {
   02  49:    INTEGER
         :     00 C2 06 9E 05 6F FD 7F 7D F6 46 11 50 D6 77 1D
         :     57 78 58 E0 D4 A1 26 7E 70 46 90 D0 BE 18 7B 5A
         :     9F 58 1B 9C 19 C3 21 F0 F5 30 3D 1C B5 65 9F FF
         :     34
   02  48:    INTEGER
         :     35 26 00 09 36 80 CD D0 A2 17 D5 B1 F8 46 40 19
         :     B5 37 68 51 CF 7E 28 1D 27 E1 20 7F 84 24 55 B5
         :     AD 22 06 FF DD EB DB B8 F4 F7 1E 42 48 6F 1E D2
         :     }
         :    }
         :   }

Authors' Addresses

   Russ Housley
   Vigil Security, LLC
   Herndon, VA,
   United States of America
   Email: housley@vigilsec.com

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   Sean Turner
   sn3rd
   Washington, DC,
   United States of America
   Email: sean@sn3rd.com

   John Preuß Mattsson
   Ericsson
   Kista
   Sweden
   Email: john.mattsson@ericsson.com

   Daniel Migault
   Ericsson
   Saint Laurent, QC
   Canada
   Email: daniel.migault@ericsson.com

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