Using EAP-TLS with TLS 1.3
draft-ietf-emu-eap-tls13-06
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 9190.
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Authors | John Preuß Mattsson , Mohit Sethi | ||
Last updated | 2019-08-03 (Latest revision 2019-05-26) | ||
Replaces | draft-mattsson-eap-tls13 | ||
RFC stream | Internet Engineering Task Force (IETF) | ||
Formats | |||
Reviews | |||
Additional resources | Mailing list discussion | ||
Stream | WG state | Waiting for WG Chair Go-Ahead | |
Document shepherd | (None) | ||
IESG | IESG state | Became RFC 9190 (Proposed Standard) | |
Consensus boilerplate | Unknown | ||
Telechat date | (None) | ||
Responsible AD | (None) | ||
Send notices to | (None) |
draft-ietf-emu-eap-tls13-06
Internet-Draft EAP-TLS with TLS 1.3 August 2019 2.1.7. Privacy TLS 1.3 significantly improves privacy when compared to earlier versions of TLS by forbidding cipher suites without confidentiality and encrypting large parts of the TLS handshake including the certificate messages. EAP-TLS peer and server implementations supporting TLS 1.3 or higher MUST support anonymous NAIs (Network Access Identifiers) (Section 2.4 in [RFC7542]) and a client supporting TLS 1.3 MUST NOT send its username in cleartext in the Identity Response. It is RECOMMENDED to use anonymous NAIs, but other privacy-friendly identities (e.g. encrypted usernames) MAY be used. As the certificate messages in TLS 1.3 are encrypted, there is no need to send an empty certificate_list and perform a second handshake for privacy (as needed by EAP-TLS with earlier versions of TLS). When EAP-TLS is used with TLS version 1.3 or higher the EAP-TLS peer and EAP-TLS server SHALL follow the processing specified by the used version of TLS. For TLS 1.3 this means that the EAP-TLS peer only sends an empty certificate_list if it does not have an appropriate certificate to send, and the EAP-TLS server MAY treat an empty certificate_list as a terminal condition. EAP-TLS with TLS 1.3 is always used with privacy. This does not add any extra round-trips and the message flow with privacy is just the normal message flow as shown in Figure 1. 2.1.8. Fragmentation Including ContentType and ProtocolVersion a single TLS record may be up to 16387 octets in length. EAP-TLS fragmentation support is provided through addition of a flags octet within the EAP-Response and EAP-Request packets, as well as a TLS Message Length field of four octets. Implementations MUST NOT set the L bit in unfragmented messages, but MUST accept unfragmented messages with and without the L bit set. Some EAP implementations and access networks may limit the number of EAP packet exchanges that can be handled. To avoid fragmentation, it is RECOMMENDED to keep the sizes of client, server, and trust anchor certificates small and the length of the certificate chains short. In addition, it is RECOMMENDED to use mechanisms that reduce the sizes of Certificate messages. While Elliptic Curve Cryptography (ECC) was optional for earlier version of TLS, TLS 1.3 mandates support of ECC (see Section 9 of [RFC8446]). To avoid fragmentation, the use of ECC in certificates, Mattsson & Sethi Expires February 3, 2020 [Page 13] Internet-Draft EAP-TLS with TLS 1.3 August 2019 signature algorithms, and groups are RECOMMENDED when using EAP-TLS with TLS 1.3 or higher. At a 128-bit security level, this reduces public key sizes from 384 bytes (RSA and DHE) to 32-64 bytes (ECDHE) and signatures from 384 bytes (RSA) to 64 bytes (ECDSA and EdDSA). An EAP-TLS deployment MAY further reduce the certificate sizes by limiting the number of Subject Alternative Names. Endpoints SHOULD reduce the sizes of Certificate messages by omitting certificates that the other endpoint is known to possess. When using TLS 1.3, all certificates that specifies a trust anchor may be omitted (see Section 4.4.2 of [RFC8446]). When using TLS 1.2, only the self-signed certificate that specifies the root certificate authority may be omitted (see Section 7.4.2 of [RFC5246]). EAP-TLS peers and servers SHOULD support and use the Cached Information Extension as specified in [RFC7924]. EAP-TLS peers and servers MAY use other extensions for reducing the sizes of Certificate messages, e.g. certificate compression [I-D.ietf-tls-certificate-compression]. 2.2. Identity Verification The identity provided in the EAP-Response/Identity is not authenticated by EAP-TLS. Unauthenticated information SHALL NOT be used for accounting purposes or to give authorization. The authenticator and the EAP server MAY examine the identity presented in EAP-Response/Identity for purposes such as routing and EAP method selection. They MAY reject conversations if the identity does not match their policy. Note that this also applies to resumption, see Sections 2.1.6, 5.6, and 5.7. 2.3. Key Hierarchy TLS 1.3 replaces the TLS pseudorandom function (PRF) used in earlier versions of TLS with HKDF and completely changes the Key Schedule. The key hierarchies shown in Section 2.3 of [RFC5216] are therefore not correct when EAP-TLS is used with TLS version 1.3 or higher. For TLS 1.3 the key schedule is described in Section 7.1 of [RFC8446]. When EAP-TLS is used with TLS version 1.3 or higher the Key_Material, IV, and Method-Id SHALL be derived from the exporter_master_secret using the TLS exporter interface [RFC5705] (for TLS 1.3 this is defined in Section 7.5 of [RFC8446]). Mattsson & Sethi Expires February 3, 2020 [Page 14] Internet-Draft EAP-TLS with TLS 1.3 August 2019 Type-Code = 0x0D Key_Material = TLS-Exporter("EXPORTER_EAP_TLS_Key_Material", Type-Code, 128) IV = TLS-Exporter("EXPORTER_EAP_TLS_IV", Type-Code, 64) Method-Id = TLS-Exporter("EXPORTER_EAP_TLS_Method-Id", Type-Code, 64) Session-Id = Type-Code || Method-Id All other parameters such as MSK and EMSK are derived in the same manner as with EAP-TLS [RFC5216], Section 2.3. The definitions are repeated below for simplicity: MSK = Key_Material(0, 63) EMSK = Key_Material(64, 127) Enc-RECV-Key = MSK(0, 31) Enc-SEND-Key = MSK(32, 63) RECV-IV = IV(0, 31) SEND-IV = IV(32, 63) The use of these keys is specific to the lower layer, as described [RFC5247]. Note that the key derivation MUST use the length values given above. While in TLS 1.2 and earlier it was possible to truncate the output by requesting less data from the TLS-Exporter function, this practice is not possible with TLS 1.3. If an implementation intends to use only a part of the output of the TLS-Exporter function, then it MUST ask for the full output and then only use the desired part. Failure to do so will result in incorrect values being calculated for the above keying material. By using the TLS exporter, EAP-TLS can use any TLS 1.3 implementation without having to extract the Master Secret, ClientHello.random, and ServerHello.random in a non-standard way. 2.4. Parameter Negotiation and Compliance Requirements TLS 1.3 cipher suites are defined differently than in earlier versions of TLS (see Section B.4 of [RFC8446]), and the cipher suites discussed in Section 2.4 of [RFC5216] can therefore not be used when EAP-TLS is used with TLS version 1.3 or higher. When EAP-TLS is used with TLS version 1.3 or higher, the EAP-TLS peers and servers MUST comply with the compliance requirements (mandatory-to-implement cipher suites, signature algorithms, key exchange algorithms, extensions, etc.) for the TLS version used. For Mattsson & Sethi Expires February 3, 2020 [Page 15] Internet-Draft EAP-TLS with TLS 1.3 August 2019 TLS 1.3 the compliance requirements are defined in Section 9 of [RFC8446]. While EAP-TLS does not protect any application data, the negotiated cipher suites and algorithms MAY be used to secure data as done in other TLS-based EAP methods. 2.5. EAP State Machines TLS 1.3 [RFC8446] introduces Post-Handshake messages. These Post- Handshake messages use the handshake content type and can be sent after the main handshake. One such Post-Handshake message is NewSessionTicket. The NewSessionTicket can be used for resumption. After sending TLS Finished, the EAP server may send any number of Post-Handshake messages in separate EAP-Requests. To decrease the uncertainty for the EAP peer, the following procedure MUST be followed: When an EAP server has sent its last handshake message (Finished or a Post-Handshake), it commits to not sending any more handshake messages by sending a TLS record with application data 0x00 (i.e. a TLS record with TLSPlaintext.type = application_data, TLSPlaintext.length = 1, and TLSPlaintext.fragment = 0x00). EAP server implementations MUST set TLSPlaintext.fragment to 0x00, but EAP peer implementations MUST accept any application data as a commit from the EAP server to not send any more handshake messages. The TLS record with application data may be sent in the same EAP-Request as the last handshake record or in a separate EAP-Request. Sending the commit in a separate EAP-Request adds an additional round-trip, but may be necessary in TLS implementations that only implement a subset of TLS 1.3. In the case where the server sends the commit in a separate commit, the conversation will appear as shown in Figure 9. After sending the application data record, the EAP server may only send an EAP-Success, an EAP-Failure, or an EAP-Request with a TLS Alert Message. Mattsson & Sethi Expires February 3, 2020 [Page 16] Internet-Draft EAP-TLS with TLS 1.3 August 2019 EAP Peer EAP Server EAP-Request/ <-------- Identity EAP-Response/ Identity (Privacy-Friendly) --------> EAP-Request/ EAP-Type=EAP-TLS <-------- (TLS Start) EAP-Response/ EAP-Type=EAP-TLS (TLS ClientHello) --------> EAP-Request/ EAP-Type=EAP-TLS (TLS ServerHello, TLS EncryptedExtensions, TLS CertificateRequest, TLS Certificate, TLS CertificateVerify, <-------- TLS Finished, EAP-Response/ EAP-Type=EAP-TLS (TLS Certificate, TLS CertificateVerify, TLS Finished) --------> EAP-Request/ EAP-Type=EAP-TLS <-------- TLS Application Data) EAP-Response/ EAP-Type=EAP-TLS --------> <-------- EAP-Success Figure 9: Commit in separate EAP-Request 3. Detailed Description of the EAP-TLS Protocol No updates to [RFC5216]. 4. IANA considerations This section provides guidance to the Internet Assigned Numbers Authority (IANA) regarding registration of values related to the EAP- TLS 1.3 protocol in accordance with [RFC8126]. This memo requires IANA to add the following labels to the TLS Exporter Label Registry defined by [RFC5705]. These labels are used in derivation of Key_Material, IV and Method-Id as defined in Section 2.3: Mattsson & Sethi Expires February 3, 2020 [Page 17] Internet-Draft EAP-TLS with TLS 1.3 August 2019 o "EXPORTER_EAP_TLS_Key_Material" o "EXPORTER_EAP_TLS_IV" o "EXPORTER_EAP_TLS_Method-Id" 5. Security Considerations 5.1. Security Claims Using EAP-TLS with TLS 1.3 does not change the security claims for EAP-TLS as given in Section 4.1 of [RFC5216]. However, it strengthens several of the claims as described in the following updates to the notes given in Section 4.1 of [RFC5216]. [1] Mutual authentication: By mandating revocation checking of certificates, the authentication in EAP-TLS with TLS 1.3 is stronger as authentication with revoked certificates will always fail. [2] Confidentiality: The TLS 1.3 handshake offers much better confidentiality than earlier versions of TLS by mandating cipher suites with confidentiality and encrypting certificates and some of the extensions, see [RFC8446]. When using EAP-TLS with TLS 1.3, the use of privacy is mandatory and does not cause any additional round- trips. [3] Key strength: TLS 1.3 forbids all algorithms with known weaknesses including 3DES, CBC mode, RC4, SHA-1, and MD5. TLS 1.3 only supports cryptographic algorithms offering at least 112-bit security, see [RFC8446]. [4] Cryptographic Negotiation: TLS 1.3 increases the number of cryptographic parameters that are negotiated in the handshake. When EAP-TLS is used with TLS 1.3, EAP-TLS inherits the cryptographic negotiation of AEAD algorithm, HKDF hash algorithm, key exchange groups, and signature algorithm, see Section 4.1.1 of [RFC8446]. 5.2. Peer and Server Identities No updates to [RFC5216]. 5.3. Certificate Validation No updates to [RFC5216]. Mattsson & Sethi Expires February 3, 2020 [Page 18] Internet-Draft EAP-TLS with TLS 1.3 August 2019 5.4. Certificate Revocation While certificates often have a long validity period spanning several years, there are a number of reasons (e.g. key compromise, CA compromise, privilege withdrawn, etc.) why client, server, or sub-CA certificates have to be revoked before their expiry date. Revocation of the EAP server's certificate is complicated by the fact that the EAP peer may not have Internet connectivity until authentication completes. EAP-TLS peers and servers supporting TLS 1.3 MUST support Certificate Status Requests (OCSP stapling) as specified in [RFC6066] and Section 4.4.2.1 of [RFC8446]. When EAP-TLS is used with TLS 1.3, the peer and server MUST use Certificate Status Requests [RFC6066] for the server's certificate chain and the EAP peer MUST treat a CertificateEntry (except the trust anchor) without a valid CertificateStatus extension as invalid and abort the handshake with an appropriate alert. When EAP-TLS is used with TLS 1.3, the server MUST check the revocation status of the certificates in the certificates in the client's certificate chain. The OCSP status handling in TLS 1.3 is different from earlier versions of TLS, see Section 4.4.2.1 of [RFC8446]. In TLS 1.3 the OCSP information is carried in the CertificateEntry containing the associated certificate instead of a separate CertificateStatus message as in [RFC4366]. This enables sending OCSP information for all certificates in the certificate chain. 5.5. Packet Modification Attacks No updates to [RFC5216]. 5.6. Authorization EAP-TLS is typically encapsulated in other protocols, such as PPP [RFC1661], RADIUS [RFC2865], Diameter [RFC6733], or PANA [RFC5191]. The encapsulating protocols can also provide additional, non-EAP information to an EAP server. This information can include, but is not limited to, information about the authenticator, information about the EAP peer, or information about the protocol layers above or below EAP (MAC addresses, IP addresses, port numbers, WiFi SSID, etc.). Servers implementing EAP-TLS inside those protocols can make policy decisions and enforce authorization based on a combination of information from the EAP-TLS exchange and non-EAP information. As noted in Section 2.2, the identity presented in EAP-Response/ Identity is not authenticated by EAP-TLS and is therefore trivial for an attacker to forge, modify, or replay. Authorization and Mattsson & Sethi Expires February 3, 2020 [Page 19] Internet-Draft EAP-TLS with TLS 1.3 August 2019 accounting MUST be based on authenticated information such as information in the certificate or the PSK identity and cached data provisioned for resumption as described in Section 5.7. Note that the requirements for Network Access Identifiers (NAIs) specified in Section 4 of [RFC7542] still apply and MUST be followed. EAP-TLS servers MAY reject conversations based on non-EAP information provided by the encapsulating protocol, for example, if the MAC address of the authenticator does not match the expected policy. 5.7. Resumption There are a number of security issues related to resumption that are not described in [RFC5216]. The problems, guidelines, and requirements in this section therefore applies to all version of TLS. When resumption occurs, it is based on cached information at the TLS layer. To perform resumption in a secure way, the EAP-TLS peer and EAP-TLS server need to be able to securely retrieve authorization information such as certificate chains, revocation status, etc. from the initial full handshake. We use the term "cached data" to describe such information. Authorization during resumption MUST be based on such cached data. There are two ways to retrieve the cached information from the original full handshake. The first method is that the TLS server and client cache the information locally. The cached information is identified by an identifier. For TLS versions before 1.3, the identifier can be the session ID, for TLS 1.3, the identifier is the PSK identity. The second method for retrieving cached information is via [RFC5077] or [RFC8446], where the TLS server encapsulates the information into a ticket and sends it to the client. The client can subsequently do resumption using the obtained ticket. Note that the client still needs to cache the information locally. The following requirements apply to both methods. If the EAP server or EAP client do not apply any authorization policies, they MAY allow resumption where no cached data is available. In all other cases, they MUST cache data during the initial full authentication to enable resumption. The cached data MUST be sufficient to make authorization decisions during resumption. If cached data cannot be retrieved in a secure way, resumption MUST NOT be done. The above requirements also apply if the EAP server expects some system to perform accounting for the session. Since accounting must be tied to an authenticated identity, and resumption does not supply Mattsson & Sethi Expires February 3, 2020 [Page 20] Internet-Draft EAP-TLS with TLS 1.3 August 2019 such an identity, accounting is impossible without access to cached data. Information from the EAP-TLS exchange (e.g. the identity provided in EAP-Response/Identity) as well as non-EAP information (e.g. IP addresses) may change between the initial full handshake and resumption. This change creates a "Time-of-check time-of-use" (TOCTOU) security vulnerability. A malicious or compromised user could supply one set of data during the initial authentication, and a different set of data during resumption, potentially leading to them obtaining access that they should not have. If any authorization, accounting, or policy decisions were made with information that have changed between the initial full handshake and resumption, and if change may lead to a different decision, such decisions MUST be reevaluated. It is RECOMMENDED that authorization, accounting, and policy decisions are reevaluated based on the information given in the resumption. EAP servers MAY reject resumption where the information supplied during resumption does not match the information supplied during the original authentication. Where a good decision is unclear, EAP servers SHOULD reject the resumption. Any security policies for authorization MUST be followed also for resumption. The EAP-TLS client and server MAY need to recheck the authorization and revocation status of the other party. The certificates may have been revoked since the initial full handshake and the authorizations of the other party may have been reduced. If the cached revocation information is not sufficiently current, the EAP Peer or EAP Server needs to force a full TLS handshake. 5.8. Privacy Considerations [RFC6973] suggests that the privacy considerations of IETF protocols be documented. TLS 1.3 offers much better privacy than earlier versions of TLS as discussed in Section 2.1.7. In this section, we only discuss the privacy properties of EAP-TLS with TLS 1.3. For privacy properties of TLS 1.3 itself, see [RFC8446]. EAP-TLS sends the standard TLS 1.3 handshake messages encapsulated in EAP packets. Additionally, the EAP peer sends an identity in the first EAP-Response. The other fields in the EAP-TLS Request and the EAP-TLS Response packets do not contain any cleartext privacy sensitive information. Mattsson & Sethi Expires February 3, 2020 [Page 21] Internet-Draft EAP-TLS with TLS 1.3 August 2019 Tracking of users by eavesdropping on identity responses or certificates is a well-known problem in many EAP methods. When EAP- TLS is used with TLS 1.3, all certificates are encrypted, and the username part of the identity response is always confidentiality protected (e.g. using Anonymous NAIs). However, as with other EAP methods, even when privacy-friendly identifiers or EAP tunneling is used, the domain name (i.e. the realm) in the NAI is still typically visible. How much privacy sensitive information the domain name leaks is highly dependent on how many other users are using the same domain name in the particular access network. If all EAP peers have the same domain, no additional information is leaked. If a domain name is used by a small subset of the EAP peers, it may aid an attacker in tracking or identifying the user. If Anonymous NAIs are not used, the privacy-friendly identifiers need to be generated with care. The identities MUST be generated in a cryptographically secure way so that that it is computationally infeasible for an attacker to differentiate two identities belonging to the same user from two identities belonging to different users in the same realm. This can be achieved, for instance, by using random or pseudo-random usernames such as random byte strings or ciphertexts. Note that the privacy-friendly usernames also MUST NOT include substrings that can be used to relate the identity to a specific user. Similarly, privacy-friendly username SHOULD NOT be formed by a fixed mapping that stays the same across multiple different authentications. An EAP peer with a policy allowing communication with EAP servers supporting only TLS 1.2 without privacy and with a static RSA key exchange is vulnerable to disclosure of the peer username. An active attacker can in this case make the EAP peer believe that an EAP server supporting TLS 1.3 only supports TLS 1.2 without privacy. The attacker can simply impersonate the EAP server and negotiate TLS 1.2 with static RSA key exchange and send an TLS alert message when the EAP peer tries to use privacy by sending an empty certificate message. Since the attacker (impersonating the EAP server) does not provide a proof-of-possession of the private key until the Finished message when a static RSA key exchange is used, an EAP peer may inadvertently disclose its identity (username) to an attacker. Therefore, it is RECOMMENDED for EAP peers to not use EAP-TLS with TLS 1.2 and static RSA based cipher suites without privacy. 5.9. Pervasive Monitoring As required by [RFC7258], work on IETF protocols needs to consider the effects of pervasive monitoring and mitigate them when possible. Mattsson & Sethi Expires February 3, 2020 [Page 22] Internet-Draft EAP-TLS with TLS 1.3 August 2019 Pervasive Monitoring is widespread surveillance of users. By encrypting more information and by mandating the use of privacy, TLS 1.3 offers much better protection against pervasive monitoring. In addition to the privacy attacks discussed above, surveillance on a large scale may enable tracking of a user over a wider geographical area and across different access networks. Using information from EAP-TLS together with information gathered from other protocols increases the risk of identifying individual users. 5.10. Discovered Vulnerabilities Over the years, there have been several serious attacks on earlier versions of Transport Layer Security (TLS), including attacks on its most commonly used ciphers and modes of operation. [RFC7457] summarizes the attacks that were known at the time of publishing and [RFC7525] provides recommendations for improving the security of deployed services that use TLS. However, many of the attacks are less serious for EAP-TLS as EAP-TLS only uses the TLS handshake and does not protect any application data. EAP-TLS implementations SHOULD mitigate known attacks and follow the recommendations in [RFC7525] and [I-D.ietf-tls-oldversions-deprecate]. The use of TLS 1.3 mitigates most of the known attacks. 6. References 6.1. 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>. [RFC3748] Aboba, B., Blunk, L., Vollbrecht, J., Carlson, J., and H. Levkowetz, Ed., "Extensible Authentication Protocol (EAP)", RFC 3748, DOI 10.17487/RFC3748, June 2004, <https://www.rfc-editor.org/info/rfc3748>. [RFC5216] Simon, D., Aboba, B., and R. Hurst, "The EAP-TLS Authentication Protocol", RFC 5216, DOI 10.17487/RFC5216, March 2008, <https://www.rfc-editor.org/info/rfc5216>. [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>. Mattsson & Sethi Expires February 3, 2020 [Page 23] Internet-Draft EAP-TLS with TLS 1.3 August 2019 [RFC5705] Rescorla, E., "Keying Material Exporters for Transport Layer Security (TLS)", RFC 5705, DOI 10.17487/RFC5705, March 2010, <https://www.rfc-editor.org/info/rfc5705>. [RFC6066] Eastlake 3rd, D., "Transport Layer Security (TLS) Extensions: Extension Definitions", RFC 6066, DOI 10.17487/RFC6066, January 2011, <https://www.rfc-editor.org/info/rfc6066>. [RFC6960] Santesson, S., Myers, M., Ankney, R., Malpani, A., Galperin, S., and C. Adams, "X.509 Internet Public Key Infrastructure Online Certificate Status Protocol - OCSP", RFC 6960, DOI 10.17487/RFC6960, June 2013, <https://www.rfc-editor.org/info/rfc6960>. [RFC7542] DeKok, A., "The Network Access Identifier", RFC 7542, DOI 10.17487/RFC7542, May 2015, <https://www.rfc-editor.org/info/rfc7542>. [RFC7924] Santesson, S. and H. Tschofenig, "Transport Layer Security (TLS) Cached Information Extension", RFC 7924, DOI 10.17487/RFC7924, July 2016, <https://www.rfc-editor.org/info/rfc7924>. [RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 8126, DOI 10.17487/RFC8126, June 2017, <https://www.rfc-editor.org/info/rfc8126>. [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>. [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>. 6.2. Informative references [I-D.ietf-tls-certificate-compression] Ghedini, A. and V. Vasiliev, "TLS Certificate Compression", draft-ietf-tls-certificate-compression-05 (work in progress), April 2019. [I-D.ietf-tls-oldversions-deprecate] Moriarty, K. and S. Farrell, "Deprecating TLSv1.0 and TLSv1.1", draft-ietf-tls-oldversions-deprecate-05 (work in progress), June 2019. Mattsson & Sethi Expires February 3, 2020 [Page 24] Internet-Draft EAP-TLS with TLS 1.3 August 2019 [IEEE-802.11] Institute of Electrical and Electronics Engineers, "IEEE Standard for Information technology--Telecommunications and information exchange between systems Local and metropolitan area networks--Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications", IEEE Std 802.11-2016 (Revision of IEEE Std 802.11-2012) , December 2016. [IEEE-802.1X] Institute of Electrical and Electronics Engineers, "IEEE Standard for Local and metropolitan area networks -- Port- Based Network Access Control", IEEE Standard 802.1X-2010 , February 2010. [MulteFire] MulteFire, "MulteFire Release 1.1 specification", 2019. [RFC1661] Simpson, W., Ed., "The Point-to-Point Protocol (PPP)", STD 51, RFC 1661, DOI 10.17487/RFC1661, July 1994, <https://www.rfc-editor.org/info/rfc1661>. [RFC2246] Dierks, T. and C. Allen, "The TLS Protocol Version 1.0", RFC 2246, DOI 10.17487/RFC2246, January 1999, <https://www.rfc-editor.org/info/rfc2246>. [RFC2560] Myers, M., Ankney, R., Malpani, A., Galperin, S., and C. Adams, "X.509 Internet Public Key Infrastructure Online Certificate Status Protocol - OCSP", RFC 2560, DOI 10.17487/RFC2560, June 1999, <https://www.rfc-editor.org/info/rfc2560>. [RFC2865] Rigney, C., Willens, S., Rubens, A., and W. Simpson, "Remote Authentication Dial In User Service (RADIUS)", RFC 2865, DOI 10.17487/RFC2865, June 2000, <https://www.rfc-editor.org/info/rfc2865>. [RFC3280] Housley, R., Polk, W., Ford, W., and D. Solo, "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", RFC 3280, DOI 10.17487/RFC3280, April 2002, <https://www.rfc-editor.org/info/rfc3280>. [RFC4282] Aboba, B., Beadles, M., Arkko, J., and P. Eronen, "The Network Access Identifier", RFC 4282, DOI 10.17487/RFC4282, December 2005, <https://www.rfc-editor.org/info/rfc4282>. Mattsson & Sethi Expires February 3, 2020 [Page 25] Internet-Draft EAP-TLS with TLS 1.3 August 2019 [RFC4346] Dierks, T. and E. Rescorla, "The Transport Layer Security (TLS) Protocol Version 1.1", RFC 4346, DOI 10.17487/RFC4346, April 2006, <https://www.rfc-editor.org/info/rfc4346>. [RFC4366] Blake-Wilson, S., Nystrom, M., Hopwood, D., Mikkelsen, J., and T. Wright, "Transport Layer Security (TLS) Extensions", RFC 4366, DOI 10.17487/RFC4366, April 2006, <https://www.rfc-editor.org/info/rfc4366>. [RFC5077] Salowey, J., Zhou, H., Eronen, P., and H. Tschofenig, "Transport Layer Security (TLS) Session Resumption without Server-Side State", RFC 5077, DOI 10.17487/RFC5077, January 2008, <https://www.rfc-editor.org/info/rfc5077>. [RFC5191] Forsberg, D., Ohba, Y., Ed., Patil, B., Tschofenig, H., and A. Yegin, "Protocol for Carrying Authentication for Network Access (PANA)", RFC 5191, DOI 10.17487/RFC5191, May 2008, <https://www.rfc-editor.org/info/rfc5191>. [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>. [RFC5247] Aboba, B., Simon, D., and P. Eronen, "Extensible Authentication Protocol (EAP) Key Management Framework", RFC 5247, DOI 10.17487/RFC5247, August 2008, <https://www.rfc-editor.org/info/rfc5247>. [RFC6733] Fajardo, V., Ed., Arkko, J., Loughney, J., and G. Zorn, Ed., "Diameter Base Protocol", RFC 6733, DOI 10.17487/RFC6733, October 2012, <https://www.rfc-editor.org/info/rfc6733>. [RFC6973] Cooper, A., Tschofenig, H., Aboba, B., Peterson, J., Morris, J., Hansen, M., and R. Smith, "Privacy Considerations for Internet Protocols", RFC 6973, DOI 10.17487/RFC6973, July 2013, <https://www.rfc-editor.org/info/rfc6973>. [RFC7258] Farrell, S. and H. Tschofenig, "Pervasive Monitoring Is an Attack", BCP 188, RFC 7258, DOI 10.17487/RFC7258, May 2014, <https://www.rfc-editor.org/info/rfc7258>. Mattsson & Sethi Expires February 3, 2020 [Page 26] Internet-Draft EAP-TLS with TLS 1.3 August 2019 [RFC7406] Schulzrinne, H., McCann, S., Bajko, G., Tschofenig, H., and D. Kroeselberg, "Extensions to the Emergency Services Architecture for Dealing With Unauthenticated and Unauthorized Devices", RFC 7406, DOI 10.17487/RFC7406, December 2014, <https://www.rfc-editor.org/info/rfc7406>. [RFC7457] Sheffer, Y., Holz, R., and P. Saint-Andre, "Summarizing Known Attacks on Transport Layer Security (TLS) and Datagram TLS (DTLS)", RFC 7457, DOI 10.17487/RFC7457, February 2015, <https://www.rfc-editor.org/info/rfc7457>. [RFC7525] Sheffer, Y., Holz, R., and P. Saint-Andre, "Recommendations for Secure Use of Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS)", BCP 195, RFC 7525, DOI 10.17487/RFC7525, May 2015, <https://www.rfc-editor.org/info/rfc7525>. [TS.33.501] 3GPP, "Security architecture and procedures for 5G System", 3GPP TS 33.501 15.5.0, June 2019. Appendix A. Updated references All the following references in [RFC5216] are updated as specified below when EAP-TLS is used with TLS 1.3 or higher. All references to [RFC2560] are updated with [RFC6960]. All references to [RFC3280] are updated with [RFC5280]. All references to [RFC4282] are updated with [RFC7542]. Acknowledgments The authors want to thank Bernard Aboba, Jari Arkko, Alan DeKok, Ari Keraenen, Jouni Malinen, Oleg Pekar, Eric Rescorla, Jim Schaad, and Vesa Torvinen for comments and suggestions on the draft. Contributors Alan DeKok, FreeRADIUS Authors' Addresses Mattsson & Sethi Expires February 3, 2020 [Page 27] Internet-Draft EAP-TLS with TLS 1.3 August 2019 John Mattsson Ericsson Stockholm 164 40 Sweden Email: john.mattsson@ericsson.com Mohit Sethi Ericsson Jorvas 02420 Finland Email: mohit@piuha.net Mattsson & Sethi Expires February 3, 2020 [Page 28]