Chaînage EAP avec TEAP

Introduction

Ce document décrit comment configurer ISE et le demandeur Windows pour le chaînage EAP (Extensible Authentication Protocol) avec le protocole TEAP (Extensible Authentication Protocol) basé sur un tunnel.

Conditions préalables

Exigences

Cisco vous recommande de prendre connaissance des rubriques suivantes :

• ISE

• Configuration du demandeur Windows

Composants utilisés

Les informations contenues dans ce document sont basées sur les versions de matériel et de logiciel suivantes :

• Cisco ISE version 3.0
• Windows 10 version 2004
• Connaissance du protocole TEAP

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. Si votre réseau est en ligne, assurez-vous de bien comprendre l’incidence possible des commandes.

Informations générales

TEAP est une méthode de protocole d'authentification extensible basée sur un tunnel qui établit un tunnel sécurisé et exécute d'autres méthodes EAP sous la protection de ce tunnel sécurisé.

L'authentification TEAP se produit en deux phases après l'échange initial de requête/réponse d'identité EAP.

Dans la première phase, le protocole TEAP utilise la connexion TLS pour fournir un échange de clés authentifié et pour établir un tunnel protégé. Une fois le tunnel établi, la deuxième phase commence avec l'homologue et le serveur engage une conversation supplémentaire pour établir les politiques d'authentification et d'autorisation requises.

Cisco ISE 2.7 et versions ultérieures prennent en charge le protocole TEAP. Les objets TLV (type-length-value) sont utilisés dans le tunnel pour transporter des données liées à l'authentification entre l'homologue EAP et le serveur EAP.

Microsoft a introduit la prise en charge de TEAP dans la version Windows 10 2004 publiée en MAI 2020.

Le chaînage EAP permet l'authentification de l'utilisateur et de la machine dans une session EAP/Radius au lieu de deux sessions distinctes.

Auparavant, pour ce faire, vous aviez besoin du module NAM Cisco AnyConnect et utilisiez EAP-FAST sur le demandeur Windows, car le demandeur Windows natif ne le prenait pas en charge. Vous pouvez désormais utiliser le demandeur natif Windows pour effectuer le chaînage EAP avec ISE 2.7 à l'aide de TEAP.

Configurer

Configuration de Cisco ISE

Étape 1. Vous devez modifier les protocoles autorisés pour activer le chaînage TEAP et EAP.

Naviguez jusqu'à  ISE > Policy > Policy Elements > Results > Authentication > Allowed Protocols > Add New . Cochez les cases de chaînage TEAP et EAP.

Étape 2. Créez un profil de certificat et ajoutez-le à la séquence source d'identité.

Naviguez jusqu'à  ISE > Administration > Identities > identity Source Sequence et sélectionnez le profil de certificat.

Étape 3. Vous devez appeler cette séquence dans la stratégie d'authentification.

Naviguez jusqu'à ISE > Policy > Policy Sets  . Choose the Policy Set for  Dot1x > Authentication Policy  et choisissez la séquence source Identity créée à l'étape 2.

Étape 4. Vous devez maintenant modifier la stratégie d'autorisation sous l'ensemble de stratégies Dot1x.

Naviguez jusqu'à   ISE > Policy > Policy Sets  . Choose the Policy Set for  Dot1x > Authentication Policy  .

Vous devez créer deux règles. La première règle vérifie que la machine est authentifiée, mais pas l'utilisateur. La deuxième règle vérifie que l'utilisateur et la machine sont authentifiés.

La configuration est ainsi terminée du côté du serveur ISE.

Configuration du demandeur natif Windows

Configurez le paramètre d'authentification câblée dans ce document.

Naviguez jusqu'à Control Panel > Network and Sharing Center > Change Adapter Settings et cliquez avec le bouton droit sur  LAN Connection > Properties. Cliquez sur le bouton  Authentication s'affiche.

Étape 1. Cliquez sur  Authentication et choisissez  Microsoft EAP-TEAP.

 

Étape 2. Cliquez sur le bouton  Settings en regard de TEAP.

1. Conserver Enable Identity Privacy activé avec anonymous en tant qu'identité.
   
2. Cochez la case en regard du ou des serveurs CA racine sous Autorités de certification racine de confiance qui sont utilisées pour signer le certificat pour l'authentification EAP sur le PSN ISE.

Étape 3. Sous Client Authentication, choisissez la méthode EAP pour l'authentification auprès de Microsoft : Smart Card or other certificate.

Étape 4. Pour chaque méthode EAP, cliquez sur le bouton  Configure et modifier selon les besoins et ccoup de langue  OK.

Étape 5. Cliquez sur le bouton  Additional Settings en bas de l'écran.

1. Enable : spécifiez le mode d'authentification.
   
2. Définissez la liste déroulante sur le paramètre approprié.
   
3. Choisir User or computer authentication afin que les deux soient authentifiés et ccoup de langue OK.

Vérifier

Vous pouvez redémarrer l'ordinateur Windows 10 ou vous déconnecter, puis vous connecter. Lorsque l'écran de connexion Windows s'affiche, l'authentification de la machine est déclenchée. 

Dans les journaux en direct, vous voyez anonymous, host/Administrator (ici le nom de la machine) dans le champ d'identité. Vous voyez anonyme parce que vous avez configuré le demandeur pour la confidentialité de l'identité ci-dessus.

Lorsque vous vous connectez au PC avec des informations d'identification, vous pouvez voir dans les journaux en direct Administrator@example.local, host/Administrator. Il s'agit du chaînage EAP où l'authentification de l'utilisateur et de la machine s'est produite dans une session EAP.

Rapport d'authentification détaillé  

Dans les détails du journal en direct, les authentifications de machine n'affichent qu'un seul NACRadiusUsername mais l'authentification utilisateur et machine enchaînée affiche deux entrées (une pour l'utilisateur et une pour la machine). En outre, vous voyez sous la  Authentication Details section, que  TEAP (EAP-TLS) a été utilisé pour la  Authentication Protocol. Si vous utilisez  MSCHAPv2 pour l'authentification des ordinateurs et des utilisateurs, le protocole d'authentification affiche  TEAP (Microsoft: Secured password (EAP-MSCHAP v2)).

Authentification machine

Authentification des utilisateurs et des machines

Dépannage

Vous devez activer ces débogages sur ISE : 

• runtime-AAA
• nsf
• nsf-session
• Active Directory (pour le dépannage entre ISE et AD)

Sous Windows, vous pouvez consulter les journaux de l'Observateur d'événements.

Analyse du journal en direct

Authentification machine

11001 Received RADIUS Access-Request
11017 RADIUS created a new session
...
...
11507 Extracted EAP-Response/Identity
12756 Prepared EAP-Request proposing TEAP with challenge
...
...
12758 Extracted EAP-Response containing TEAP challenge-response and accepting TEAP as negotiated
12800 Extracted first TLS record; TLS handshake started
12805 Extracted TLS ClientHello message
12806 Prepared TLS ServerHello message
12807 Prepared TLS Certificate message
12808 Prepared TLS ServerKeyExchange message
12809 Prepared TLS CertificateRequest message
...
...
12811 Extracted TLS Certificate message containing client certificate
12812 Extracted TLS ClientKeyExchange message
12813 Extracted TLS CertificateVerify message
12804 Extracted TLS Finished message
12801 Prepared TLS ChangeCipherSpec message
12802 Prepared TLS Finished message
12816 TLS handshake succeeded
...
...
11559 Client certificate was requested but not received inside the tunnel. Will continue with inner method.
11620 TEAP full handshake finished successfully
...
...
11627 Starting EAP chaining
11573 Selected identity type 'User'
11564 TEAP inner method started
11521 Prepared EAP-Request/Identity for inner EAP method
...
...
11567 Identity type provided by client is equal to requested
11522 Extracted EAP-Response/Identity for inner EAP method
11806 Prepared EAP-Request for inner method proposing EAP-MSCHAP with challenge
11596 Prepared EAP-Request with another TEAP challenge
11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request
...
...
11515 Supplicant declined inner EAP method selected by Authentication Policy but did not proposed another one; inner EAP negotiation failed
11520 Prepared EAP-Failure for inner EAP method
11566 TEAP inner method finished with failure
22028 Authentication failed and the advanced options are ignored
33517 Sent TEAP Intermediate Result TLV indicating failure
11596 Prepared EAP-Request with another TEAP challenge
...
...
11574 Selected identity type 'Machine'
11564 TEAP inner method started
11521 Prepared EAP-Request/Identity for inner EAP method
...
...
11567 Identity type provided by client is equal to requested
11522 Extracted EAP-Response/Identity for inner EAP method
11806 Prepared EAP-Request for inner method proposing EAP-MSCHAP with challenge
11596 Prepared EAP-Request with another TEAP challenge
...
...
12523 Extracted EAP-Response/NAK for inner method requesting to use EAP-TLS instead
12522 Prepared EAP-Request for inner method proposing EAP-TLS with challenge
12625 Valid EAP-Key-Name attribute received
11596 Prepared EAP-Request with another TEAP challenge
...
... 
12524 Extracted EAP-Response containing EAP-TLS challenge-response for inner method and accepting EAP-TLS as negotiated
12800 Extracted first TLS record; TLS handshake started
12545 Client requested EAP-TLS session ticket
12546 The EAP-TLS session ticket received from supplicant. Inner EAP-TLS does not support stateless session resume. Performing full authentication
12805 Extracted TLS ClientHello message
12806 Prepared TLS ServerHello message
12807 Prepared TLS Certificate message
12808 Prepared TLS ServerKeyExchange message
12809 Prepared TLS CertificateRequest message
12527 Prepared EAP-Request for inner method with another EAP-TLS challenge
...
...
12571 ISE will continue to CRL verification if it is configured for specific CA - certificate for Users
12811 Extracted TLS Certificate message containing client certificate
12812 Extracted TLS ClientKeyExchange message
12813 Extracted TLS CertificateVerify message
12804 Extracted TLS Finished message
12801 Prepared TLS ChangeCipherSpec message
12802 Prepared TLS Finished message
12816 TLS handshake succeeded
12509 EAP-TLS full handshake finished successfully
...
...
12527 Prepared EAP-Request for inner method with another EAP-TLS challenge
11596 Prepared EAP-Request with another TEAP challenge
...
...
61025 Open secure connection with TLS peer
15041 Evaluating Identity Policy
22072 Selected identity source sequence - forAD1
22070 Identity name is taken from certificate attribute
22037 Authentication Passed
12528 Inner EAP-TLS authentication succeeded
11519 Prepared EAP-Success for inner EAP method
11565 TEAP inner method finished successfully
...
... 
33516 Sent TEAP Intermediate Result TLV indicating success
11596 Prepared EAP-Request with another TEAP challenge
11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
11595 Extracted EAP-Response containing TEAP challenge-response
11637 Inner method supports EMSK but the client provided only MSK. Allow downgrade as per configuration
11576 TEAP cryptobinding verification passed
...
...
15036 Evaluating Authorization Policy
24209 Looking up Endpoint in Internal Endpoints IDStore - anonymous,host/Administrator
24211 Found Endpoint in Internal Endpoints IDStore
11055 User name change detected for the session. Attributes for the session will be removed from the cache
15048 Queried PIP - Network Access.EapChainingResult
15016 Selected Authorization Profile - PermitAccess
33514 Sent TEAP Result TLV indicating success
...
...
11597 TEAP authentication phase finished successfully
11503 Prepared EAP-Success
11002 Returned RADIUS Access-Accept

Authentification des utilisateurs et des machines

11001 Received RADIUS Access-Request
11017 RADIUS created a new session
...
...
12756 Prepared EAP-Request proposing TEAP with challenge
...
...
12758 Extracted EAP-Response containing TEAP challenge-response and accepting TEAP as negotiated
12800 Extracted first TLS record; TLS handshake started
12805 Extracted TLS ClientHello message
12806 Prepared TLS ServerHello message
12807 Prepared TLS Certificate message
12808 Prepared TLS ServerKeyExchange message
12809 Prepared TLS CertificateRequest message
11596 Prepared EAP-Request with another TEAP challenge
...
...
12811 Extracted TLS Certificate message containing client certificate
12812 Extracted TLS ClientKeyExchange message
12813 Extracted TLS CertificateVerify message
12804 Extracted TLS Finished message
12801 Prepared TLS ChangeCipherSpec message
12802 Prepared TLS Finished message
12816 TLS handshake succeeded
11559 Client certificate was requested but not received inside the tunnel. Will continue with inner method.
11620 TEAP full handshake finished successfully
11596 Prepared EAP-Request with another TEAP challenge
...
...
11595 Extracted EAP-Response containing TEAP challenge-response
11627 Starting EAP chaining
11573 Selected identity type 'User'
11564 TEAP inner method started
11521 Prepared EAP-Request/Identity for inner EAP method
11596 Prepared EAP-Request with another TEAP challenge
...
...
11567 Identity type provided by client is equal to requested
11522 Extracted EAP-Response/Identity for inner EAP method
11806 Prepared EAP-Request for inner method proposing EAP-MSCHAP with challenge
11596 Prepared EAP-Request with another TEAP challenge
...
...
12523 Extracted EAP-Response/NAK for inner method requesting to use EAP-TLS instead
12522 Prepared EAP-Request for inner method proposing EAP-TLS with challenge
...
...
11595 Extracted EAP-Response containing TEAP challenge-response
12524 Extracted EAP-Response containing EAP-TLS challenge-response for inner method and accepting EAP-TLS as negotiated
12800 Extracted first TLS record; TLS handshake started
12545 Client requested EAP-TLS session ticket
12546 The EAP-TLS session ticket received from supplicant. Inner EAP-TLS does not support stateless session resume. Performing full authentication
12805 Extracted TLS ClientHello message
12806 Prepared TLS ServerHello message
12807 Prepared TLS Certificate message
12808 Prepared TLS ServerKeyExchange message
12809 Prepared TLS CertificateRequest message
12527 Prepared EAP-Request for inner method with another EAP-TLS challenge
...
...
12526 Extracted EAP-Response for inner method containing TLS challenge-response
12571 ISE will continue to CRL verification if it is configured for specific CA - certificate for Users
12811 Extracted TLS Certificate message containing client certificate
12812 Extracted TLS ClientKeyExchange message
12813 Extracted TLS CertificateVerify message
12804 Extracted TLS Finished message
12801 Prepared TLS ChangeCipherSpec message
12802 Prepared TLS Finished message
12816 TLS handshake succeeded
12509 EAP-TLS full handshake finished successfully
12527 Prepared EAP-Request for inner method with another EAP-TLS challenge
...
...
12526 Extracted EAP-Response for inner method containing TLS challenge-response
61025 Open secure connection with TLS peer
15041 Evaluating Identity Policy
22072 Selected identity source sequence - forAD1
22070 Identity name is taken from certificate attribute
22037 Authentication Passed
12528 Inner EAP-TLS authentication succeeded
11519 Prepared EAP-Success for inner EAP method
11565 TEAP inner method finished successfully
33516 Sent TEAP Intermediate Result TLV indicating success
11596 Prepared EAP-Request with another TEAP challenge
...
...
11595 Extracted EAP-Response containing TEAP challenge-response
11637 Inner method supports EMSK but the client provided only MSK. Allow downgrade as per configuration
11576 TEAP cryptobinding verification passed
11574 Selected identity type 'Machine'
11564 TEAP inner method started
...
...
11806 Prepared EAP-Request for inner method proposing EAP-MSCHAP with challenge
11596 Prepared EAP-Request with another TEAP challenge
...
...
12523 Extracted EAP-Response/NAK for inner method requesting to use EAP-TLS instead
12522 Prepared EAP-Request for inner method proposing EAP-TLS with challenge
...
...
12524 Extracted EAP-Response containing EAP-TLS challenge-response for inner method and accepting EAP-TLS as negotiated
12800 Extracted first TLS record; TLS handshake started
12545 Client requested EAP-TLS session ticket
12546 The EAP-TLS session ticket received from supplicant. Inner EAP-TLS does not support stateless session resume. Performing full authentication
12805 Extracted TLS ClientHello message
12806 Prepared TLS ServerHello message
12807 Prepared TLS Certificate message
12808 Prepared TLS ServerKeyExchange message
12809 Prepared TLS CertificateRequest message
12527 Prepared EAP-Request for inner method with another EAP-TLS challenge
...
...
12526 Extracted EAP-Response for inner method containing TLS challenge-response
12571 ISE will continue to CRL verification if it is configured for specific CA - certificate for Users
12811 Extracted TLS Certificate message containing client certificate
12812 Extracted TLS ClientKeyExchange message
12813 Extracted TLS CertificateVerify message
12804 Extracted TLS Finished message
12801 Prepared TLS ChangeCipherSpec message
12802 Prepared TLS Finished message
12816 TLS handshake succeeded
12509 EAP-TLS full handshake finished successfully
12527 Prepared EAP-Request for inner method with another EAP-TLS challenge
11596 Prepared EAP-Request with another TEAP challenge
11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
11595 Extracted EAP-Response containing TEAP challenge-response
12526 Extracted EAP-Response for inner method containing TLS challenge-response
61025 Open secure connection with TLS peer
15041 Evaluating Identity Policy
22072 Selected identity source sequence - forAD1
22070 Identity name is taken from certificate attribute
22037 Authentication Passed
12528 Inner EAP-TLS authentication succeeded
11519 Prepared EAP-Success for inner EAP method
11565 TEAP inner method finished successfully
33516 Sent TEAP Intermediate Result TLV indicating success
11596 Prepared EAP-Request with another TEAP challenge
11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
11595 Extracted EAP-Response containing TEAP challenge-response
11637 Inner method supports EMSK but the client provided only MSK. Allow downgrade as per configuration
11576 TEAP cryptobinding verification passed
15036 Evaluating Authorization Policy
24209 Looking up Endpoint in Internal Endpoints IDStore - Administrator@example.local,host/Administrator
24211 Found Endpoint in Internal Endpoints IDStore
11055 User name change detected for the session. Attributes for the session will be removed from the cache
15048 Queried PIP - Network Access.EapChainingResult
15016 Selected Authorization Profile - PermitAccess
33514 Sent TEAP Result TLV indicating success
11596 Prepared EAP-Request with another TEAP challenge
11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
11595 Extracted EAP-Response containing TEAP challenge-response
11597 TEAP authentication phase finished successfully
11503 Prepared EAP-Success
11002 Returned RADIUS Access-Accept

Informations connexes

• https://www.rfc-editor.org/rfc/rfc7170
• https://www.rfc-editor.org/rfc/rfc5077
• https://www.cisco.com/c/en/us/support/docs/wireless-mobility/eap-fast/200322-Understanding-EAP-FAST-and-Chaining-imp.html
• Assistance et documentation techniques - Cisco Systems