Contents

Introduction

Prerequisites

Requirements

Components used

Configure

ASA

ISE

Troubleshoot

Working Scenario

Non-working Scenario 1

Non-working Scenario 2

Non-working Scenario 3

Video

Introduction

This document describes how to configure Secure Sockets Layer (SSL) Anyconnect with the Cisco Identity Services Engine (ISE) for user mapping to specific Group-Policy.

Contributed by Amanda Nava, Cisco TAC Engineer.

Prerequisites

Requirements

Cisco recommends that you have knowledge of these topics:

- AnyConnect Secure Mobility Client Version 4.7

- Cisco ISE 2.4

- Cisco ASA version 9.8 or later.

Components used

The content of this document is based on these software and hardware versions.

- Adaptive Security Appliance (ASA) 5506 with Software Version 9.8.1

- AnyConnect Secure Mobility Client 4.2.00096 on Microsoft Windows 10 64-bit.

- ISE Version 2.4.

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. If your network is live, ensure that you understand the potential impact of any command.

Configure

In the example, Anyconnect users connect directly without the option to select tunnel-group from the drop-down menu as they are assigned by Cisco ISE to specific Group-Policy in accordance to their attributes.

ASA

AAA-Server

aaa-server ISE_AAA protocol radius

aaa-server ISE_AAA (Outside) host 10.31.124.82

key cisco123

Anyconnect

webvpn

enable outside

anyconnect image disk0:/anyconnect-win-4.7.01076-webdeploy-k9.pkg 1

anyconnect enable

tunnel-group DefaultWEBVPNGroup general-attributes

address-pool Remote_users

authentication-server-group ISE_AAA

group-policy DfltGrpPolicy attributes

banner value ###YOU DON'T HAVE AUTHORIZATION TO ACCESS ANY INTERNAL RESOURCES###

vpn-simultaneous-logins 0

vpn-tunnel-protocol ssl-client

group-policy RADIUS-USERS internal

group-policy RADIUS-USERS attributes

banner value YOU ARE CONNECTED TO ### RADIUS USER AUTHENTICATION###

vpn-simultaneous-logins 3

vpn-tunnel-protocol ssl-client

split-tunnel-network-list value SPLIT_ACL

group-policy RADIUS-ADMIN internal

group-policy RADIUS-ADMIN attributes

banner value YOU ARE CONNECTED TO ###RADIUS ADMIN AUTHENTICATION ###

vpn-simultaneous-logins 3

vpn-tunnel-protocol ssl-client

split-tunnel-network-list none

Note: With this configuration example you are able to assign the group-policy to each Anyconnect user through ISE configuration. Because the users don't have the option to select the tunnel group, they are connected to the DefaultWEBVPNGroup tunnel-group and the DfltGrpPolicy. After authentication happens and the Class attribute (Group-policy) returns in the ISE authentication response, the user is assigned to the corresponding group. In the case, the user doesn't have a Class attribute applied, this user still remains in the DfltGrpPolicy. You can configure the vpn-simultaneous-logins 0 under the DfltGrpPolicy group in order to avoid users without group-policy to connect through the VPN.

ISE

Step1. Add the ASA to ISE.

For this step navigate to Administration>Network Resources>Network Devices.

Step 2. Create identity groups.

Define Identity groups to associate each user to the right one in the next steps. Navigate to Administration>Groups>User Identity Groups.

Step 3. Associate users to identity groups.

Associate users to the right identity group. Navigate to Administration>Identities>Users.

Step 4. Create Policy Set.

Define a new policy set as shown in example (all device Types) under conditions. Navigate to Policy>Policy sets.

Step 5. Create an Authorization Policy.

Create a new Authorization Policy with the proper condition to match the identity group.

Step 6. Create an Authorization Profile.

Create a new Authorization Profile with RADIUS: Class<Group-policy-ASA> attribute and *Access Type: ACCESS_ACCEPT.

Step 7. Review Authorization Profile configuration.

Note: Follow the configuration as it is shown on the previous image, Access_Accept, Class—[25], the RADIUS-ADMIN is the name of your group policy (can be changed).

The image shows how configuration must look like. On the same Policy set, you have n authorization policies, each one matches the identity group necessary in the conditions section and uses the group policy you have on the ASA In the profile section.

With this configuration example, you are able to assign the group-policy to each Anyconnect user through ISE configuration based on the class attribute.

Troubleshoot

One of the most useful debugs is debug radius. It shows details of the radius authentication request and authentication response between AAA and ASA process.

debug radius

Another useful tool is the command test aaa-server. You now see if the authentication is ACCEPTED or REFUSED and the attributes ('class' attribute in this example) exchanged in the authentication process.

test aaa-server authentication <aaa_server_group> [host <name>|<host_ip>] username <user> password <password>

Working Scenario

In the configuration example mentioned above user1 belongs to RADIUS-ADMIN group-policy in accordance with the ISE configuration, it can be verified if you run the test aaa-server and debug radius. Highlight the lines that need to be verified.

ASAv# debug radius

ASAv#test aaa-server authentication ISE_AAA host 10.31.124.82 username user1 password *****

INFO: Attempting Authentication test to IP address (10.31.124.82) (timeout: 12 seconds)

RADIUS packet decode (authentication request)

--------------------------------------

Raw packet data (length = 84).....

01 1e 00 54 ac b6 7c e5 58 22 35 5e 8e 7c 48 73    |  ...T..|.X"5^.|Hs

04 9f 8c 74 01 07 75 73 65 72 31 02 12 ad 19 1c    |  ...t..user1.....

40 da 43 e2 ba 95 46 a7 35 85 52 bb 6f 04 06 0a    |  @.C...F.5.R.o...

1f 7c 55 05 06 00 00 00 06 3d 06 00 00 00 05 1a    |  .|U......=......

15 00 00 00 09 01 0f 63 6f 61 2d 70 75 73 68 3d    |  .......coa-push=

74 72 75 65                                        |  true

Parsed packet data.....

Radius: Code = 1 (0x01)

Radius: Identifier = 30 (0x1E)

Radius: Length = 84 (0x0054)

Radius: Vector: ACB67CE55822355E8E7C4873049F8C74

Radius: Type = 1 (0x01) User-Name

Radius: Length = 7 (0x07)

Radius: Value (String) =

75 73 65 72 31                                     |  user1

Radius: Type = 2 (0x02) User-Password

Radius: Length = 18 (0x12)

Radius: Value (String) =

ad 19 1c 40 da 43 e2 ba 95 46 a7 35 85 52 bb 6f    |  ...@.C...F.5.R.o

Radius: Type = 4 (0x04) NAS-IP-Address

Radius: Length = 6 (0x06)

Radius: Value (IP Address) = 10.31.124.85 (0x0A1F7C55)

Radius: Type = 5 (0x05) NAS-Port

Radius: Length = 6 (0x06)

Radius: Value (Hex) = 0x6

Radius: Type = 61 (0x3D) NAS-Port-Type

Radius: Length = 6 (0x06)

Radius: Value (Hex) = 0x5

Radius: Type = 26 (0x1A) Vendor-Specific

Radius: Length = 21 (0x15)

Radius: Vendor ID = 9 (0x00000009)

Radius: Type = 1 (0x01) Cisco-AV-pair

Radius: Length = 15 (0x0F)

Radius: Value (String) =

63 6f 61 2d 70 75 73 68 3d 74 72 75 65             |  coa-push=true

send pkt 10.31.124.82/1645

rip 0x00007f03b419fb08 state 7 id 30

rad_vrfy() : response message verified

rip 0x00007f03b419fb08

: chall_state ''

: state 0x7

: reqauth:

ac b6 7c e5 58 22 35 5e 8e 7c 48 73 04 9f 8c 74

: info 0x00007f03b419fc48

session_id 0x80000007

request_id 0x1e

user 'user1'

response '***'

app 0

reason 0

skey 'cisco123'

sip 10.31.124.82

type 1

RADIUS packet decode (response)

--------------------------------------

Raw packet data (length = 188).....

02 1e 00 bc 9e 5f 7c db ad 63 87 d8 c1 bb 03 41    |  ....._|..c.....A

37 3d 7a 35 01 07 75 73 65 72 31 18 43 52 65 61    |  7=z5..user1.CRea

75 74 68 53 65 73 73 69 6f 6e 3a 30 61 31 66 37    |  uthSession:0a1f7

63 35 32 52 71 51 47 52 72 70 36 5a 35 66 4e 4a    |  c52RqQGRrp6Z5fNJ

65 4a 39 76 4c 54 6a 73 58 75 65 59 35 4a 70 75    |  eJ9vLTjsXueY5Jpu

70 44 45 61 35 36 34 66 52 4f 44 57 78 34 19 0e    |  pDEa564fRODWx4..

52 41 44 49 55 53 2d 41 44 4d 49 4e 19 50 43 41    |  RADIUS-ADMIN.PCA

43 53 3a 30 61 31 66 37 63 35 32 52 71 51 47 52    |  CS:0a1f7c52RqQGR

72 70 36 5a 35 66 4e 4a 65 4a 39 76 4c 54 6a 73    |  rp6Z5fNJeJ9vLTjs

58 75 65 59 35 4a 70 75 70 44 45 61 35 36 34 66    |  XueY5JpupDEa564f

52 4f 44 57 78 34 3a 69 73 65 61 6d 79 32 34 2f    |  RODWx4:iseamy24/

33 37 39 35 35 36 37 34 35 2f 33 31                |  379556745/31

Parsed packet data.....

Radius: Code = 2 (0x02)

Radius: Identifier = 30 (0x1E)

Radius: Length = 188 (0x00BC)

Radius: Vector: 9E5F7CDBAD6387D8C1BB0341373D7A35

Radius: Type = 1 (0x01) User-Name

Radius: Length = 7 (0x07)

Radius: Value (String) =

75 73 65 72 31                                     |  user1

Radius: Type = 24 (0x18) State

Radius: Length = 67 (0x43)

Radius: Value (String) =

52 65 61 75 74 68 53 65 73 73 69 6f 6e 3a 30 61    |  ReauthSession:0a

31 66 37 63 35 32 52 71 51 47 52 72 70 36 5a 35    |  1f7c52RqQGRrp6Z5

66 4e 4a 65 4a 39 76 4c 54 6a 73 58 75 65 59 35    |  fNJeJ9vLTjsXueY5

4a 70 75 70 44 45 61 35 36 34 66 52 4f 44 57 78    |  JpupDEa564fRODWx

34                                                 |  4

Radius: Type = 25 (0x19) Class

Radius: Length = 14 (0x0E)

Radius: Value (String) =

52 41 44 49 55 53 2d 41 44 4d 49 4e                |  RADIUS-ADMIN

Radius: Type = 25 (0x19) Class

Radius: Length = 80 (0x50)

Radius: Value (String) =

43 41 43 53 3a 30 61 31 66 37 63 35 32 52 71 51    |  CACS:0a1f7c52RqQ

47 52 72 70 36 5a 35 66 4e 4a 65 4a 39 76 4c 54    |  GRrp6Z5fNJeJ9vLT

6a 73 58 75 65 59 35 4a 70 75 70 44 45 61 35 36    |  jsXueY5JpupDEa56

34 66 52 4f 44 57 78 34 3a 69 73 65 61 6d 79 32    |  4fRODWx4:iseamy2

34 2f 33 37 39 35 35 36 37 34 35 2f 33 31          |  4/379556745/31

rad_procpkt: ACCEPT

RADIUS_ACCESS_ACCEPT: normal termination

RADIUS_DELETE

remove_req 0x00007f03b419fb08 session 0x80000007 id 30

free_rip 0x00007f03b419fb08

radius: send queue empty

INFO: Authentication Successful

Another way to verify if it works when the user1 connects through Anyconnect, use the show vpn-sessiondb anyconnect command to know the Group-policy assigned by the ISE class attribute.

ASAv# show vpn-sessiondb anyconnect

Session Type: AnyConnect

Username     : user1                  Index        : 28

Assigned IP  : 10.100.2.1             Public IP    : 10.100.1.3

Protocol     : AnyConnect-Parent SSL-Tunnel DTLS-Tunnel

License      : AnyConnect Premium

Encryption   : AnyConnect-Parent: (1)none  SSL-Tunnel: (1)AES-GCM-256  DTLS-Tunnel: (1)AES256

Hashing      : AnyConnect-Parent: (1)none  SSL-Tunnel: (1)SHA384  DTLS-Tunnel: (1)SHA1

Bytes Tx     : 15604                  Bytes Rx     : 28706

Group Policy : RADIUS-ADMIN           Tunnel Group : DefaultWEBVPNGroup

Login Time   : 04:14:45 UTC Wed Jun 3 2020

Duration     : 0h:01m:29s

Inactivity   : 0h:00m:00s

VLAN Mapping : N/A                    VLAN         : none

Audt Sess ID : 0a6401010001c0005ed723b5

Security Grp : none

Non-working Scenario 1

If the Authentication fails on Anyconnect and the ISE replies with a REJECT. You need to verify either the user is associate with a User Identity Group or the password is incorrect. Navigate to Operations>Live logs > Details.

RADIUS packet decode (response)

--------------------------------------

Raw packet data (length = 20).....

03 21 00 14 dd 74 bb 43 8f 0a 40 fe d8 92 de 7a    |  .!...t.C..@....z

27 66 15 be                                        |  'f..

Parsed packet data.....

Radius: Code = 3 (0x03)

Radius: Identifier = 33 (0x21)

Radius: Length = 20 (0x0014)

Radius: Vector: DD74BB438F0A40FED892DE7A276615BE

rad_procpkt: REJECT

RADIUS_DELETE

remove_req 0x00007f03b419fb08 session 0x80000009 id 33

free_rip 0x00007f03b419fb08

radius: send queue empty

ERROR: Authentication Rejected: AAA failure

Note: In this example, user1 is not associated with any User Identity Group. Therefore, it hits the Default Authentication and Authorization policies under the New Policy Set 1  with the DenyAccess action. You can modify this action to PermitAcces in the Default Authorization Policy to allow the users without the User identity group associated authenticate.

Non-working Scenario 2

If the Authentication fails on Anyconnect and the default Authorization policy is PermitAccess, the authentication is accepted. However, the class attribute is not presented in the Radius response, therefore the user is located in the DfltGrpPolicy and it won't connect due to vpn-simultaneous-logins 0.

RADIUS packet decode (response)

--------------------------------------

Raw packet data (length = 174).....

02 24 00 ae 5f 0f bc b1 65 53 64 71 1a a3 bd 88    |  .$.._...eSdq....

7c fe 44 eb 01 07 75 73 65 72 31 18 43 52 65 61    |  |.D...user1.CRea

75 74 68 53 65 73 73 69 6f 6e 3a 30 61 31 66 37    |  uthSession:0a1f7

63 35 32 32 39 54 68 33 47 68 6d 44 54 49 35 71    |  c5229Th3GhmDTI5q

37 48 46 45 30 7a 6f 74 65 34 6a 37 50 76 69 4b    |  7HFE0zote4j7PviK

5a 35 77 71 6b 78 6c 50 39 33 42 6c 4a 6f 19 50    |  Z5wqkxlP93BlJo.P

43 41 43 53 3a 30 61 31 66 37 63 35 32 32 39 54    |  CACS:0a1f7c5229T

68 33 47 68 6d 44 54 49 35 71 37 48 46 45 30 7a    |  h3GhmDTI5q7HFE0z

6f 74 65 34 6a 37 50 76 69 4b 5a 35 77 71 6b 78    |  ote4j7PviKZ5wqkx

6c 50 39 33 42 6c 4a 6f 3a 69 73 65 61 6d 79 32    |  lP93BlJo:iseamy2

34 2f 33 37 39 35 35 36 37 34 35 2f 33 37          |  4/379556745/37

Parsed packet data.....

Radius: Code = 2 (0x02)

Radius: Identifier = 36 (0x24)

Radius: Length = 174 (0x00AE)

Radius: Vector: 5F0FBCB1655364711AA3BD887CFE44EB

Radius: Type = 1 (0x01) User-Name

Radius: Length = 7 (0x07)

Radius: Value (String) =

75 73 65 72 31                                     |  user1

Radius: Type = 24 (0x18) State

Radius: Length = 67 (0x43)

Radius: Value (String) =

52 65 61 75 74 68 53 65 73 73 69 6f 6e 3a 30 61    |  ReauthSession:0a

31 66 37 63 35 32 32 39 54 68 33 47 68 6d 44 54    |  1f7c5229Th3GhmDT

49 35 71 37 48 46 45 30 7a 6f 74 65 34 6a 37 50    |  I5q7HFE0zote4j7P

76 69 4b 5a 35 77 71 6b 78 6c 50 39 33 42 6c 4a    |  viKZ5wqkxlP93BlJ

6f                                                 |  o

Radius: Type = 25 (0x19) Class

Radius: Length = 80 (0x50)

Radius: Value (String) =

43 41 43 53 3a 30 61 31 66 37 63 35 32 32 39 54    |  CACS:0a1f7c5229T

68 33 47 68 6d 44 54 49 35 71 37 48 46 45 30 7a    |  h3GhmDTI5q7HFE0z

6f 74 65 34 6a 37 50 76 69 4b 5a 35 77 71 6b 78    |  ote4j7PviKZ5wqkx

6c 50 39 33 42 6c 4a 6f 3a 69 73 65 61 6d 79 32    |  lP93BlJo:iseamy2

34 2f 33 37 39 35 35 36 37 34 35 2f 33 37          |  4/379556745/37

rad_procpkt: ACCEPT

RADIUS_ACCESS_ACCEPT: normal termination

RADIUS_DELETE

remove_req 0x00007f03b419fb08 session 0x8000000b id 36

free_rip 0x00007f03b419fb08

radius: send queue empty

INFO: Authentication Successful

ASAv#

If the vpn-simultaneous-logins 0 is changed to '1', The user connects as shown in the output:

ASAv# show vpn-sessiondb anyconnect

Session Type: AnyConnect

Username     : user1                  Index        : 41

Assigned IP  : 10.100.2.1             Public IP    : 10.100.1.3

Protocol     : AnyConnect-Parent SSL-Tunnel DTLS-Tunnel

License      : AnyConnect Premium

Encryption   : AnyConnect-Parent: (1)none  SSL-Tunnel: (1)AES-GCM-256  DTLS-Tunnel: (1)AES256

Hashing      : AnyConnect-Parent: (1)none  SSL-Tunnel: (1)SHA384  DTLS-Tunnel: (1)SHA1

Bytes Tx     : 15448                  Bytes Rx     : 15528

Group Policy : DfltGrpPolicy          Tunnel Group : DefaultWEBVPNGroup

Login Time   : 18:43:39 UTC Wed Jun 3 2020

Duration     : 0h:01m:40s

Inactivity   : 0h:00m:00s

VLAN Mapping : N/A                    VLAN         : none

Audt Sess ID : 0a640101000290005ed7ef5b

Security Grp : none

Non-working Scenario 3

If the Authentication passes but the user doesn't have the right policies applied, for example, if the group-policy connected has the split tunnel instead of the full tunnel as it must be. The user can be in the wrong User identity group.

ASAv# sh vpn-sessiondb anyconnect

Session Type: AnyConnect

Username     : user1                  Index        : 29

Assigned IP  : 10.100.2.1             Public IP    : 10.100.1.3

Protocol     : AnyConnect-Parent SSL-Tunnel

License      : AnyConnect Premium

Encryption   : AnyConnect-Parent: (1)none  SSL-Tunnel: (1)AES-GCM-256

Hashing      : AnyConnect-Parent: (1)none  SSL-Tunnel: (1)SHA384

Bytes Tx     : 15592                  Bytes Rx     : 0

Group Policy : RADIUS-USERS           Tunnel Group : DefaultWEBVPNGroup

Login Time   : 04:36:50 UTC Wed Jun 3 2020

Duration     : 0h:00m:20s

Inactivity   : 0h:00m:00s

VLAN Mapping : N/A                    VLAN         : none

Audt Sess ID : 0a6401010001d0005ed728e2

Security Grp : none

Video

This video provides the steps to configure SSL Anyconnect With ISE Authentication And Class Attribute For Group-Policy Mapping.