RADIUS Extensions Working Group                                S. Winter
Internet-Draft                                                   RESTENA
Intended status: Experimental                                M. McCauley
Expires: December 19, 2008                                           OSC
                                                               S. Venaas
                                                           June 17, 2008

              TLS encryption for RADIUS over TCP (RadSec)

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Copyright Notice

   Copyright (C) The IETF Trust (2008).


   This document specifies security on the transport layer (TLS) for the
   RADIUS protocol [2] when transmitted over TCP [9].  This enables
   dynamic trust relationships between RADIUS servers.

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  4
   2.  Transport Layer Security . . . . . . . . . . . . . . . . . . .  4
     2.1.  Operation  . . . . . . . . . . . . . . . . . . . . . . . .  4
     2.2.  Ciphersuites and Compression Negotiation . . . . . . . . .  6
     2.3.  RADIUS Shared Secret Usage in RadSec . . . . . . . . . . .  6
   3.  Comparison of Diameter vs. RadSec  . . . . . . . . . . . . . .  7
   4.  Diameter Compatibility . . . . . . . . . . . . . . . . . . . .  7
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  8
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     8.1.  Informative References . . . . . . . . . . . . . . . . . .  9
     8.2.  Normative References . . . . . . . . . . . . . . . . . . .  9
   Appendix A.  DNS NAPTR Peer Discovery  . . . . . . . . . . . . . . 10
   Appendix B.  Implementation Overview: Radiator . . . . . . . . . . 11
   Appendix C.  Implementation Overview: radsecproxy  . . . . . . . . 12

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1.  Introduction

   The RADIUS protocol [2] is a widely deployed authentication and
   authorisation protocol.  The supplementary RADIUS Accounting
   specification [3] also provides accounting mechanisms, thus
   delivering a full AAA solution.  However, RADIUS is experiencing
   several shortcomings, such as its dependency on the unreliable
   transport protocol UDP and the lack of security for large parts of
   its packet payload.

   Several enhancements have been proposed to overcome RADIUS'
   limitations.  An IETF Standards Track protocol, Diameter [6], has
   been designed to provide an AAA protocol that should deprecate
   RADIUS.  However, given that current implementations of Diameter are
   either not freely accessible, or do not provide the flexibility of
   current RADIUS deployments, or both, an intermediate solution that is
   based on RADIUS but provides mechanisms to overcome many of its
   drawbacks has been implemented by several vendors.  These
   implementations are interoperable and deployed in a world-wide
   wireless roaming infrastructure.  The protocol is called RadSec.
   This document describes version 2 of the RadSec protocol.  Version 1
   of RadSec is defined in the RadSec whitepaper [10].  The two
   currently existing implementations of RadSec version 2 are described
   in Appendix B and Appendix C.

   The main focus of RadSec is to provide a means to secure the
   communication between RADIUS/TCP peers on the transport layer.  The
   most important use of RadSec lies in roaming environments where
   RADIUS packets need to be transferred through different
   administrative domains and untrusted, potentially hostile networks.
   An example for a world-wide roaming environment that uses RadSec to
   secure communication is "eduroam", see [15].

   The new features in RadSec obsolete the use of IP addresses and
   shared secrets to identify other peers and thus allow the dynamic
   establishment of connections to peers that are not previously
   configured.  The definition of lookup mechanisms is out of scope of
   this document, but an implementation of a DNS NAPTR lookup based
   mechanism exists and is described as an example lookup mechanism in
   Appendix A.

   Transitioning from a plain RADIUS infrastructure to a RadSec
   infrastructure is very easy, since the RADIUS packet payload is
   identical in both protocols.  Enabling RadSec can be done on a per-
   server basis.  Unlike in Diameter, the learning curve for a new
   protocol does not exist, which makes it almost trivial for an
   experienced RADIUS server administrator to switch to a RadSec-secured
   transport for RADIUS packets.

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   The security layer does not require any new assignments of codepoints
   for the RADIUS protocol.  No new attributes are defined and no new
   packet codes are used.

1.1.  Requirements Language

   In this document, several words are used to signify the requirements
   of the specification.  The key words "MUST", "MUST NOT", "REQUIRED",
   and "OPTIONAL" in this document are to be interpreted as described in

2.  Transport Layer Security

2.1.  Operation

   Once the TCP connection between two RadSec nodes is established, a
   TLS session is established.  At least TLSv1.1 [7] is used.  Both
   nodes either mutually present a X.509 certificate which is verified
   according to [5] or use a shared key authentication for TLS which
   needs to be pre-configured out-of-band prior to the connection

   The list of Certification Authorities that a node which acts as a
   server is willing to accept SHOULD be sent during the Certificate
   Request message in the CertificateRequest struct (section 7.4.4 of
   [7]).  Rationale: If a RadSec node acts as a client and is in
   possession of multiple certificates from different CAs (i.e. is part
   of multiple roaming consortia) and dynamic discovery is used, and the
   dynamic discovery mechanism does not provide sufficient meta
   information to identify the server's roaming consortium, then it is
   necessary to signal which consortium it is connecting to.

   The list of Certification Authorities that a node which acts as a
   client is willing to accept can not be signaled within the TLS 1.1
   handshake.  This makes it impossible to select the right certificate
   if a RadSec node which is acting as a server for multiple roaming
   consortia (in possession of multiple certificates from different CAs)
   is contacted by a client.  This situation is likely to change in TLS
   1.2, according to [8].  "Trusted CA Indication" as in [8], section 6,
   SHOULD be used.

   When using X.509 certificate validation, peer validation always
   includes a check on whether the DNS name or the IP address of the
   server that is contacted matches its certificate.  When a RadSec peer
   establishes a new connection (acts as a client) to another peer, the
   following rules of precedence are used during validation:

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   o  If the client expects a certain fully qualified domain name (FQDN)
      and the presented certificate contains both at least one instance
      of the subjectAltName field with type dNSName and a Common Name,
      then the certificate is considered a match if any one of those
      subjectAltName fields matches the expected FQDN.  The Common Name
      field is not evaluated in this case.
   o  If the client expects a certain fully qualified domain name (FQDN)
      and the presented certificate does not contain any subjectAltName
      field with type dNSName, then the certificate is considered a
      match if the Common Name field matches the expected FQDN.
   o  If the client expects a certain IP address and the presented
      certificate contains both at least one instance of the
      subjectAltName field with type iPAddr and a Common Name, then the
      certificate is considered a match if any one of those
      subjectAltName fields matches the expected IP address.  The Common
      Name field is not evaluated in this case.
   o  If the client expects a certain IP address and the presented
      certificate does not contain any subjectAltName field with type
      iPAddr, then the certificate is considered a match if the Common
      Name field matches the expected IP address.
   Further restrictions on the certificate MAY be verified, depending on
   the trust fabric of the peering agreement.

   If dynamic peer resolution is used, the above verification steps MAY
   not be sufficient to ensure that a connecting peer is authorised to
   perform user authentications.  In these cases, the trust fabric
   SHOULD NOT depend on untrusted peer resolution methods like DNS to
   identify and authorise nodes.  Instead, the operators of the RadSec
   infrastructure SHOULD define their own trust model and apply this
   model to the certificates after they have passed the standard
   validity checks above.  Current RadSec implementations offer varying
   degrees of versatility for defining criteria which certificates to

   NOTE WELL: None of the current implementations provide configuration
   options for using TLS with pre-shared keys.  However, the underlying
   libraries support it, so support for that should be implementable

   After the TLS session is established, RADIUS packet payloads are
   exchanged over the encrypted TLS tunnel.  In plain RADIUS, the packet
   size can be determined by evaluating the size of the datagram that
   arrived.  Due to the stream nature of TCP and TLS, this does not hold
   true for RadSec packet exchange.  Instead, packet boundaries of
   RADIUS packets that arrive in the stream are calculated by evaluating
   the packet's Length field.  Special care MUST be taken on the packet
   sender side that the value of the Length field is indeed correct
   before sending it over the TLS tunnel, because incorrect packet

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   lengths can no longer be detected by a differing datagram boundary.

2.2.  Ciphersuites and Compression Negotiation

   RadSec implementations need not necessarily support all TLS
   ciphersuites listed in [7]. Not all TLS ciphersuites are supported by
   available TLS tool kits and licenses may be required in some cases.
   The existing implementations of RadSec use OpenSSL as cryptographic
   backend, which supports all of the ciphersuites listed in the rules

   To ensure interoperability, RadSec clients and servers MUST
   support the TLS [7] mandatory-to-implement ciphersuite:

   In addition, RadSec servers SHOULD support and be able to
   negotiate all of the following TLS ciphersuites:
   o  TLS_RSA_WITH_RC4_128_MD5
   o  TLS_RSA_WITH_RC4_128_SHA
   In addition, RadSec clients SHOULD support the following
   TLS ciphersuites [4]:
   o  TLS_RSA_WITH_RC4_128_SHA
   Since TLS supports ciphersuite negotiation, peers completing the
   TLS negotiation will also have selected a ciphersuite, which
   includes encryption and hashing methods.

   TLS also supports compression as well as ciphersuite
   negotiation. During the RadSec conversation the client and server MAY
   negotiate compression.  However, a peer MUST continue the
   conversation even if the other peer rejects compression.

2.3.  RADIUS Shared Secret Usage in RadSec

   Within RADIUS [2], a shared secret is used for hiding of attributes
   such as User-Password, as well as in computation of the Response
   Authenticator.  In RADIUS accounting [3], the shared secret is used
   in computation of both the Request Authenticator and the Response

   Since in RADIUS a shared secret is used to provide confidentiality
   as well as integrity protection and authentication, the use of TLS
   ciphers which encrypt the stream payload in RadSec can provide
   security services sufficient to substitute for RADIUS application-
   layer security. Therefore, where TLS ciphers that provide encryption
   are used, it will not be necessary to configure a RADIUS shared

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   Then, the secret shared between two RadSec peers MAY not
   be configured. In this case, the shared secret defaults to "radsec"
   (without the quotes). However, if the RadSec nodes negotiated a TLS
   cipher that provides integrity assurance only, the connection MUST be
   configured with a non-default RADIUS shared secret.

3.  Comparison of Diameter vs. RadSec

   The feature set in the Diameter Base Protocol is almost a superset of
   the features present in RadSec.  Sophisticated mechanisms for
   keepalive, reliable transmission and payload security exist.  The
   reason for specifying a short-term intermediate solution as opposed
   to using Diameter at the moment are the lack of suitable, publicly
   available and versatile implementations.

   Typically, RADIUS servers do not only support the RADIUS protocol
   itself, but also provide interfaces to a wide variety of backends
   (credential stores) to actually verify a user's credentials.  In
   highly heterogeneous environments like eduroam, where a lot of
   different backends are in use by the participating home servers
   (OpenLDAP, Novell eDirectory, ActiveDirectory, SQL databases or plain
   text files, just to name a few), such versatility is a requirement.
   Current Diameter server implementations focus on the validation of a
   small set of EAP methods (mostly EAP-SIM and EAP-TLS) and
   consequently on a small set of backends to verify these credentials.

   A further requirement in environments like eduroam is affordability.
   Public institutions like schools and universities often face tight
   budgets, and so an open source implementation of Diameter would be
   desirable (just as FreeRADIUS is for the RADIUS protocol).
   Unfortunately, the few Open Source Software implementations of the
   Diameter protocol like OpenDiameter [12] or JDiameter [13] only
   provide a set of libraries, but no server at all.

   Diameter's ability to resolve peers dynamically is limited to using
   either SLPv2 or DNS, whereas RadSec allows arbitrary peer resolution
   mechanisms.  This greater amount of flexibility can pay off in many
   roaming federations.  In eduroam's case, a central SAML-based meta
   data repository ("eduGAIN-MDS") is in place which is able to provide
   peer addresses.  Using RadSec it is possible to resolve a peer's
   address through such a meta data system, whereas with Diameter it is
   not possible to use this repository natively.

4.  Diameter Compatibility

   Since RadSec is only a new transport profile for RADIUS,
   compatibility of RadSec - Diameter vs. RADIUS - Diameter is
   identical.  The considerations regarding payload size in [9] apply.

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5.  Security Considerations

   The computational resources to establish a TLS tunnel are
   significantly higher than simply sending mostly unencrypted UDP
   datagrams.  Therefore, clients connecting to a RadSec node will more
   easily create high load conditions and a malicious client might
   create a Denial-of-Service attack more easily.

   In the case of dynamic peer discovery, a RadSec node needs to be able
   to accept connections from a large, not previously known, group of
   hosts, possibly the whole internet.  In this case, the server's
   RadSec port can not be protected from unauthorised connection
   attempts with measures on the network layer, i.e. access lists and
   firewalls.  This opens more attack vectors for Distributed Denial of
   Service attacks, just like any other service that is supposed to
   serve arbitrary clients (like for example web servers).

   Some TLS ciphersuites only provide integrity validation of their
   payload, and provide no encryption.  When such ciphersuites are
   negotiated in a RadSec TLS handshake, the only means of protecting
   sensitive payload contents is the RADIUS shared secret.  If the
   RADIUS shared secret is set to the default "radsec" and a non-
   encrypting TLS ciphersuite is used, implementations should either
   forbid transmitting payload over this connection completely or at
   least issue a warning to whatever logging destination is configured
   by the administrator.

6.  IANA Considerations

   This document has no actions for IANA.  The TCP port 2083 was already
   previously assigned by IANA for RadSec.  The Status-Server packet was
   already assigned by IANA for [2].

7.  Acknowledgements

   RadSec version 1 was first implemented by Open Systems Consultants,
   Currumbin Waters, Australia, for their "Radiator" RADIUS server

   Funding and input for the development of this Internet Draft was
   provided by the European Commission co-funded project "GEANT2" [16]
   and further feedback was provided by the TERENA Task Force Mobility

8.  References

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8.1.  Informative References

   [1]   Bradner, S., "Key words for use in RFCs to Indicate Requirement
         Levels", RFC 2119, March 1997.

8.2.  Normative References

   [2]   Rigney, C., Rubens, A., Simpson, W., and S. Willens, "Remote
         Authentication Dial In User Service (RADIUS)", RFC 2865,
         June 2000.

   [3]   Rigney, C., "RADIUS Accounting", RFC 2866, June 2000.

   [4]   Chown, P., "Advanced Encryption Standard (AES) Ciphersuites for
         Transport Layer Security (TLS)", RFC 3268, June 2002.

   [5]   Cooper, D., Santesson, S., Farrell, S., Boeyen, S., Housley,
         R., and T. Polk, "Internet X.509 Public Key Infrastructure
         Certificate and Certificate Revocation List (CRL) Profile",
         RFC 5280, May 2008.

   [6]   Calhoun, P., Laughney, J., Arkko, J., Guttman, E., and G. Zorn,
         "Diameter Base Protocol", RFC 3588, September 2003.

   [7]   Dierks, T. and E. Rescorla, "The Transport Layer Security (TLS)
         Protocol Version 1.1", RFC 4346, April 2006.

   [8]   Eastlake 3rd, D., "Transport Layer Security (TLS) Extensions:
         Extension Definitions", February 2008, <http://www.ietf.org/

   [9]   Winter, S., "Reliable Transport Profile for RADIUS", July 2008,

   [10]  Open System Consultants, "RadSec - a secure, reliable RADIUS
         Protocol", May 2005,

   [11]  Open System Consultants, "Radiator Radius Server - Installation
         and Reference Manual", 2006,

   [12]  Open Diameter Project, "Open Diameter", 2006,

   [13]  Svenson, E., "JDiameter Project Homepage", 2006,

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   [14]  Venaas, S., "radsecproxy Project Homepage", 2007,

   [15]  Trans-European Research and Education Networking Association,
         "eduroam Homepage", 2007, <http://www.eduroam.org/>.

   [16]  Delivery of Advanced Network Technology to Europe, "European
         Commission Information Society and Media: GEANT2", 2008,

   [17]  TERENA, "Trans-European Research and Education Networking
         Association", 2008, <http://www.terena.org/>.

Appendix A.  DNS NAPTR Peer Discovery

   The following text is quoted from the file goodies/dnsroam.cfg in the
   Radiator distribution; further documentation of the <AuthBy DNSROAM>
   feature in Radiator can be found at [11].  It describes an algorithm
   to retrieve the RadSec route information from the global DNS using
   NAPTR and SRV records.  The input of the algorithm is the realm part
   of the user name.

   The following algorithm is used to discover a target server from a
   Realm using DNS:
   1.  Look for NAPTR records for the Realm.
   2.  For each NAPTR found record, examine the Service field and use
       that to determine the transport protocol and TLS requirements for
       the server.  The Service field starts with 'AAA' for insecure and
       'AAAS' for TLS secured.  The Service field contains '+RADSECS'
       for RadSec over SCTP, '+RADSECT' for RadSec over TCP or '+RADIUS'
       for RADIUS protocol over UDP.  The most common Service field you
       will see will be 'AAAS+RADSECT' for TLS secured RadSec over TCP.
       A.  If the NAPTR has the 'S' flag, look for SRV records for the
           name.  For each SRV record found, note the Port number and
           then look for A and AAAA records corresponding to the name in
           the SRV record.
       B.  If the NAPTR has the 'A' flag, look for a A and AAAA records
           for the name.
   4.  If no NAPTR records are found, look for A and AAAA records based
       directly on the realm name.  For example, if the realm is
       'examplerealm.edu', it looks for records such as
       '_radsec._tcp.examplerealm.edu', '_radsec._sctp.examplerealm.edu'
       and '_radius._udp.examplerealm.edu',
   5.  All A and AAAA records found are ordered according to their Order
       and Preference fields.  The most preferable server address is
       used as the target server address, along with any other server
       attributes discovered from DNS.  If no SRV record was found for

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       the address, the DNSROAM configured Port is used.
   For example, if the User-Name realm was 'examplerealm.edu', and DNS
   contained the following records:
      examplerealm.edu.  IN NAPTR 50 50 "s" "AAAS+RADSECT" ""
      _radsec._tcp.examplerealm.edu.  IN SRV 0 10 2083
      radsec.examplerealm.edu.  IN AAAA 2001::202:44ff:fe0a:f704
   Then the target selected would be a RadSec server on port 2083 at
   IPv6 address 2001::202:44ff:fe0a:f704.  The connection would be made
   over TCP/IP, and TLS encryption would be used.  This complete
   specification of the realm is the most flexible and is recommended.

Appendix B.  Implementation Overview: Radiator

   Radiator implements the RadSec protocol for proxying requests with
   the <Authby RADSEC> and <ServerRADSEC> clauses in the Radiator
   configuration file.

   The <AuthBy RADSEC> clause defines a RadSec client, and causes
   Radiator to send RADIUS requests to the configured RadSec server
   using the RadSec protocol.

   The <ServerRADSEC> clause defines a RadSec server, and causes
   Radiator to listen on the configured port and address(es) for
   connections from <Authby RADSEC> clients.  When an <Authby RADSEC>
   client connects to a <ServerRADSEC> server, the client sends RADIUS
   requests through the stream to the server.  The server then services
   the request in the same was as if the request had been received from
   a conventional UDP RADIUS client.

   Radiator is compliant to version 2 of RadSec if the following options
   are used:
      <AuthBy RADSEC>
      *  Protocol tcp
      *  UseTLS
      *  TLS_CertificateFile
      *  Protocol tcp
      *  UseTLS
      *  TLS_RequireClientCert
   As of Radiator 3.15, the default shared secret for RadSec connections
   is "mysecret" (without quotes).  The implementation uses TCP
   keepalive socket options, but does not send Status-Server packets.
   Once established, TLS connections are kept open throughout the server
   instance lifetime.

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Appendix C.  Implementation Overview: radsecproxy

   The RADIUS proxy named radsecproxy was written in order to allow use
   of RadSec in current RADIUS deployments.  This is a generic proxy
   that supports any number and combination of clients and servers,
   supporting RADIUS over UDP and RadSec.  The main idea is that it can
   be used on the same host as a non-RadSec client or server to ensure
   RadSec is used on the wire, however as a generic proxy it can be used
   in other circumstances as well.

   The configuration file consists of client and server clauses, where
   there is one such clause for each client or server.  In such a clause
   one specifies either "type tls" or "type udp" for RadSec or UDP
   transport.  For RadSec the default shared secret "mysecret" (without
   quotes), the same as Radiator, is used.  A secret may be specified by
   putting say "secret somesharedsecret" inside a client or server

   In order to use TLS for clients and/or servers, one must also specify
   where to locate CA certificates, as well as certificate and key for
   the client or server.  This is done in a TLS clause.  There may be
   one or several TLS clauses.  A client or server clause may reference
   a particular TLS clause, or just use a default one.  One use for
   multiple TLS clauses may be to present one certificate to clients and
   another to servers.

   If any RadSec (TLS) clients are configured, the proxy will at startup
   listen on port 2083, as assigned by IANA for the OSC RadSec
   implementation.  An alternative port may be specified.  When a client
   connects, the client certificate will be verified, including checking
   that the configured FQDN or IP address matches what is in the
   certificate.  Requests coming from a RadSec client are treated
   exactly like requests from UDP clients.

   The proxy will at startup try to establish a TLS connection to each
   (if any) of the configured RadSec (TLS) servers.  If it fails to
   connect to a server, it will retry regularly.  There is some back-off
   where it will retry quickly at first, and with longer intervals
   later.  If a connection to a server goes down it will also start
   retrying regularly.  When setting up the TLS connection, the server
   certificate will be verified, including checking that the configured
   FQDN or IP address matches what is in the certificate.  Requests are
   sent to a RadSec server just like they would to a UDP server.

   The proxy supports Status-Server messages.  They are only sent to a
   server if enabled for that particular server.  Status-Server requests
   are always responded to.

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   This RadSec implementation has been successfully tested together with
   Radiator.  It is a freely available open-source implementation.  For
   source code and documentation, see [14].

Authors' Addresses

   Stefan Winter
   Fondation RESTENA
   6, rue Richard Coudenhove-Kalergi
   Luxembourg  1359

   Phone: +352 424409 1
   Fax:   +352 422473
   EMail: stefan.winter@restena.lu
   URI:   http://www.restena.lu.

   Mike McCauley
   Open Systems Consultants
   9 Bulbul Place
   Currumbin Waters  QLD 4223

   Phone: +61 7 5598 7474
   Fax:   +61 7 5598 7070
   EMail: mikem@open.com.au
   URI:   http://www.open.com.au.

   Stig Venaas
   Abels gate 5 - Teknobyen
   Trondheim  7465

   Phone: +47 73 55 79 00
   Fax:   +47 73 55 79 01
   EMail: stig.venaas@uninett.no
   URI:   http://www.uninett.no.

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Winter, et al.          Expires December 19, 2008              [Page 14]