Contents

Introduction

Prerequisites

Requirements

Components Used

Configure

Configuration on the FTD

Verify

Troubleshoot

Introduction

This document provides a configuration example of Lightweight Directory Access Protocol (LDAP) mapping for AnyConnect users on Firepower Threat Defense (FTD) using a Firepower Management Center (FMC) FlexConfig policy. This configuration is used to allow specific users that belong to an Active Directory (AD) group to establish a Virtual Private Network (VPN) connection. Users from different AD groups not defined on the map won't be able to connect with the same profile.

Prerequisites

Requirements

Cisco recommends that you have knowledge on these topics:

- AD realm configuration on FMC

- Windows Active Directory

- AnyConnect (SSLVPN) configuration on FMC

- Basic knowledge of FlexConfig objects on FMC

Components Used

- FirePower Manager Center (FMC) version 6.2.3 and 6.5.0

- FirePower Threat Defense (FTD) version 6.2.3 and 6.5.0

- Windows Server with Active Directory

Configure

Configuration on the FTD

In this example, users that belong to AD Group1 use a tunnel-all configuration and users that belong to AD Group2 have limited access to specific hosts. All other users that don't belong to these groups can't be authenticated.

Step 1. Configure AnyConnect using LDAP authentication and deploy the changes. An example can be found on this guide.

Step 2. Navigate to Devices > Remote Access > Edit AnyConnect Policy > Advanced > Group Policies.

Step 3. Create 3 different group-policies:

- Group1 with Split Tunneling configuration set to Allow all traffic over tunnel.

- Group2 with Split Tunneling configuration set to Split.

- NOACCESS group for users that do not belong to any of the previous groups. The field Simultaneous Login Per User must be set to 0.

Step 4. Assign the NOACCESS group-policy to the connection profile.

Step 5. Navigate to Object > Object Managemen t> FlexConfig > FlexConfig Object > Add FlexConfig Object.

Step 6. Add the necessary memberOf values required for the LDAP attribute-map configuration. To get the Group DN from the server you can use the command "dsquery samid -group <group-name>".

The Deployment needs to be set as Once and Type as Prepend.

Tip: Attribute Names and Values are Case-Sensitive. If the mapping does not occur properly, be certain that the correct spelling and capitalization has been used in the LDAP attribute map for boththe Cisco and LDAP attribute names and values.

Step 7. Create another FlexConfig Object named AAAserverLDAPmapping. This Object attaches the attribute-map to the aaa-server configuration.

The Deployment values need to be set as Everytime and Type as Append.

Step 8. Navigate to Devices > FlexConfig > Edit current FlexConfig.  Ensure that the order of the FlexConfig objects in the FlexConfig Policy is first the LDAP Attribute Map FlexConfig object followed by the AAA-server object.

Step 9. Deploy the configuration to the device to send this configuration to the managed device.

In order to add an extra entry on the LDAP map, modify the existing FlexConfig LDAPAtributeMAP Object to ONLY include the new map-value.

Verify

Connect to the FTD CLISH and issue these commands to ensure that the users on the defined groups are able to connect.

> show vpn-sessiondb anyconnect

Session Type: AnyConnect

Username     : cisco1                 Index        : 25

Assigned IP  : 10.10.10.1             Public IP    : 192.168.109.80

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     : 15820                  Bytes Rx     : 160

Group Policy : Group1                 Tunnel Group : AnyConnect

Login Time   : 16:02:45 UTC Tue Oct 9 2018

Duration     : 0h:00m:38s

Inactivity   : 0h:00m:00s

VLAN Mapping : N/A                    VLAN         : none

Audt Sess ID : 00000000000190005bbcd125

Security Grp : none                   Tunnel Zone  : 0

> show vpn-sessiondb anyconnect

Session Type: AnyConnect

Username     : cisco2                 Index        : 26

Assigned IP  : 11.11.11.1             Public IP    : 192.168.109.80

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     : 15820                  Bytes Rx     : 442

Group Policy : Group2                 Tunnel Group : AnyConnect

Login Time   : 16:04:12 UTC Tue Oct 9 2018

Duration     : 0h:00m:14s

Inactivity   : 0h:00m:00s

VLAN Mapping : N/A                    VLAN         : none

Audt Sess ID : 000000000001a0005bbcd17c

Security Grp : none                   Tunnel Zone  : 0

Troubleshoot

Debugs:

In order to check the LDAP transaction, you can use these debug commands.

> system support diagnostic-cli

debug ldap 250

debug aaa common 250

These are examples of successful output for each debug command.

firepower# debug ldap 250

debug ldap  enabled at level 250

firepower#

[49] Session Start

[49] New request Session, context 0x00002aaad332f100, reqType = Authentication

[49] Fiber started

[49] Creating LDAP context with uri=ldap://192.168.109.29:389

[49] Connect to LDAP server: ldap://192.168.109.29:389, status = Successful

[49] supportedLDAPVersion: value = 3

[49] supportedLDAPVersion: value = 2

[49] LDAP server 192.168.109.29 is Active directory

[49] Binding as AdminFTD

[49] Performing Simple authentication for AdminFTD to 192.168.109.29

[49] LDAP Search:

Base DN = [DC=cisco,DC=com]

Filter  = [samaccountname=cisco1]

Scope   = [SUBTREE]

[49] User DN = [CN=cisco1,CN=Users,DC=cisco,DC=com]

[49] Talking to Active Directory server 192.168.109.29

[49] Reading password policy for cisco1, dn:CN=cisco1,CN=Users,DC=cisco,DC=com

[49] Read bad password count 1

[49] Binding as cisco1

[49] Performing Simple authentication for cisco1 to 192.168.109.29

[49] Processing LDAP response for user cisco1

[49] Message (cisco1):

[49] Authentication successful for cisco1 to 192.168.109.29

[49] Retrieved User Attributes:

[49]    objectClass: value = top

[49]    objectClass: value = person

[49]    objectClass: value = organizationalPerson

[49]    objectClass: value = user

[49]    cn: value = cisco1

[49]    givenName: value = cisco1

[49]    distinguishedName: value = CN=cisco1,CN=Users,DC=cisco,DC=com

[49]    instanceType: value = 4

[49]    whenCreated: value = 20181009153032.0Z

[49]    whenChanged: value = 20181009154032.0Z

[49]    displayName: value = cisco1

[49]    uSNCreated: value = 856333

[49]    memberOf: value = CN=group1,CN=Users,DC=cisco,DC=com

[49]            mapped to Group-Policy: value = Group1

[49]            mapped to LDAP-Class: value = Group1

[49]    uSNChanged: value = 856372

[49]    name: value = cisco1

[49]    objectGUID: value = .K.'..3N....Q...

[49]    userAccountControl: value = 66048

[49]    badPwdCount: value = 1

[49]    codePage: value = 0

[49]    countryCode: value = 0

[49]    badPasswordTime: value = 131835752510299209

[49]    lastLogoff: value = 0

[49]    lastLogon: value = 131835733331105504

[49]    pwdLastSet: value = 131835726324409149

[49]    primaryGroupID: value = 513

[49]    objectSid: value = ............E1.E.G..9..@s...

[49]    adminCount: value = 1

[49]    accountExpires: value = 9223372036854775807

[49]    logonCount: value = 0

[49]    sAMAccountName: value = cisco1

[49]    sAMAccountType: value = 805306368

[49]    userPrincipalName: value = cisco1@cisco.com

[49]    objectCategory: value = CN=Person,CN=Schema,CN=Configuration,DC=cisco,DC=com

[49]    dSCorePropagationData: value = 20181009153316.0Z

[49]    dSCorePropagationData: value = 16010101000000.0Z

[49]    lastLogonTimestamp: value = 131835732321783732

[49] Fiber exit Tx=551 bytes Rx=2628 bytes, status=1

[49] Session End

firepower# debug aaa common 250

debug aaa common enabled at level 250

firepower# AAA API: In aaa_open

AAA session opened: handle = 31

AAA API: In aaa_process_async

aaa_process_async: sending AAA_MSG_PROCESS

AAA task: aaa_process_msg(0x00002b4ad7423b20) received message type 0

[31] AAA FSM: In AAA_StartAAATransaction

[31] AAA FSM: In AAA_InitTransaction

Initiating authentication to primary server (Svr Grp: LDAP-29)

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

[31] AAA FSM: In AAA_BindServer

[31] AAA_BindServer: Using server: 192.168.109.29

[31] AAA FSM: In AAA_SendMsg

User: cisco1

Resp:

callback_aaa_task: status = 1, msg =

[31] AAA FSM: In aaa_backend_callback

aaa_backend_callback: Handle = 31, pAcb = 0x00002aaad352bc80

AAA task: aaa_process_msg(0x00002b4ad7423b20) received message type 1

[31] AAA FSM: In AAA_ProcSvrResp

Back End response:

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

Authentication Status: 1 (ACCEPT)

[31] AAA FSM: In AAA_NextFunction

AAA_NextFunction: i_fsm_state = IFSM_PRIM_AUTHENTICATE, auth_status = ACCEPT

AAA_NextFunction: authen svr = LDAP-29, author svr = <none>, user pol = Group1, tunn pol = NOACCESS

AAA_NextFunction: New i_fsm_state = IFSM_USER_GRP_POLICY,

[31] AAA FSM: In AAA_InitTransaction

aaai_policy_name_to_server_id(Group1)

Got server ID 0 for group policy DB

Initiating user group policy lookup (Svr Grp: GROUP_POLICY_DB)

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

[31] AAA FSM: In AAA_BindServer

[31] AAA_BindServer: Using server: <Internal Server>

[31] AAA FSM: In AAA_SendMsg

User: Group1

Resp:

grp_policy_ioctl(0x00002b4ad31fd460, 114698, 0x00002b4ad7423430)

grp_policy_ioctl: Looking up Group1

callback_aaa_task: status = 1, msg =

[31] AAA FSM: In aaa_backend_callback

aaa_backend_callback: Handle = 31, pAcb = 0x00002aaad352bc80

AAA task: aaa_process_msg(0x00002b4ad7423b20) received message type 1

[31] AAA FSM: In AAA_ProcSvrResp

Back End response:

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

User Group Policy Status: 1 (ACCEPT)

[31] AAA FSM: In AAA_NextFunction

AAA_NextFunction: i_fsm_state = IFSM_USER_GRP_POLICY, auth_status = ACCEPT

AAA_NextFunction: New i_fsm_state = IFSM_TUNN_GRP_POLICY,

[31] AAA FSM: In AAA_InitTransaction

aaai_policy_name_to_server_id(NOACCESS)

Got server ID 0 for group policy DB

Initiating tunnel group policy lookup (Svr Grp: GROUP_POLICY_DB)

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

[31] AAA FSM: In AAA_BindServer

[31] AAA_BindServer: Using server: <Internal Server>

[31] AAA FSM: In AAA_SendMsg

User: NOACCESS

Resp:

grp_policy_ioctl(0x00002b4ad31fd460, 114698, 0x00002b4ad7423430)

grp_policy_ioctl: Looking up NOACCESS

callback_aaa_task: status = 1, msg =

[31] AAA FSM: In aaa_backend_callback

aaa_backend_callback: Handle = 31, pAcb = 0x00002aaad352bc80

AAA task: aaa_process_msg(0x00002b4ad7423b20) received message type 1

[31] AAA FSM: In AAA_ProcSvrResp

Back End response:

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

Tunnel Group Policy Status: 1 (ACCEPT)

[31] AAA FSM: In AAA_NextFunction

AAA_NextFunction: i_fsm_state = IFSM_TUNN_GRP_POLICY, auth_status = ACCEPT

dACL processing skipped: no ATTR_FILTER_ID found

AAA_NextFunction: New i_fsm_state = IFSM_DONE,

[31] AAA FSM: In AAA_ProcessFinal

Checking simultaneous login restriction (max allowance=3) for user cisco1

Class attribute created from LDAP-Class attribute

[31] AAA FSM: In AAA_Callback

user attributes:

1     User-Name(1)      6    "cisco1"

2     User-Password(2)     13    (hidden)

3     Group-Policy(4121)      6    "Group1"

4     AAA-AVP-Table(4243)    1639    "g[06][00][00]$[00][00][00]x[01][00][00][8F][01][00][00]"

5     DAP class attribute required(20510)      4    1

6     LDAP-Class(20520)      7    "Group1[00]"

User Access-Lists:

user_acl[0] = NULL

user_acl[1] = NULL

user policy attributes:                             <--- Group-Policy Configuration (Group1)

1     Filter-Id(11)      8    ""

2     Session-Timeout(27)      4    0

3     Idle-Timeout(28)      4    30

4     Simultaneous-Logins(4098)      4    3

5     Primary-DNS(4101)      4    IP: 0.0.0.0

6     Secondary-DNS(4102)      4    IP: 0.0.0.0

7     Primary-WINS(4103)      4    IP: 0.0.0.0

8     Secondary-WINS(4104)      4    IP: 0.0.0.0

9     Tunnelling-Protocol(4107)      4    96

10     Banner(4111)      0    0x00002aaad49daa38   ** Unresolved Attribute **

11     Split-Tunnel-Inclusion-List(4123)      8    ""

12     Default-Domain-Name(4124)      0    0x00002aaad49daa41   ** Unresolved Attribute **

13     Secondary-Domain-Name-List(4125)      0    0x00002aaad49daa42   ** Unresolved Attribute **

14     Split-Tunneling-Policy(4151)      4    0

15     Group-giaddr(4157)      4    IP: 0.0.0.0

16     WebVPN SVC Keepalive interval(4203)      4    20

17     WebVPN SVC Client DPD period(4204)      4    30

18     WebVPN SVC Gateway DPD period(4205)      4    30

19     WebVPN SVC Rekey period(4206)      4    0

20     WebVPN SVC Rekey method(4207)      4    0

21     WebVPN SVC Compression(4208)      4    0

22     WebVPN SVC Firewall Rule(4211)     17    "public#,private#,"

23     WebVPN SVC DTLS Compression(4213)      4    0

24     WebVPN SVC DTLS enable(4219)      4    1

25     WebVPN SVC MTU(4221)      4    1406

26     CVC-Modules(4223)      4    "dart"

27     CVC-Profile(4224)     11    "FTD03#user,"

28     CVC-Ask(4227)      4    2

29     CVC-Ask-Timeout(4228)      4    0

30     VLAN ID(4236)      4    0

31     WebVPN Idle timeout alert interval(4244)      4    1

32     WebVPN Session timeout alert interval(4245)      4    1

33     List of address pools to assign addresses from(4313)      3    "SSL"

34     SVC ignore DF bit(4326)      4    0

35     Configure the behaviour of DNS queries by the client when Split tunneling is enabled(4328)      4    0

36     Primary-IPv6-DNS(4329)     16    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  37     Secondary-IPv6-DNS(4330)     16    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  38     Client Bypass Protocol(4331)      4    0

39     IPv6-Split-Tunneling-Policy(4332)      4    0

User Policy Access-Lists:

user_acl[0] = NULL

user_acl[1] = NULL

tunnel policy attributes:                                      <--- Default Group-Policy attributes (NOACCESS)

1     Filter-Id(11)      8    ""

2     Session-Timeout(27)      4    0

3     Idle-Timeout(28)      4    30

4     Simultaneous-Logins(4098)      4    0

5     Primary-DNS(4101)      4    IP: 0.0.0.0

6     Secondary-DNS(4102)      4    IP: 0.0.0.0

7     Primary-WINS(4103)      4    IP: 0.0.0.0

8     Secondary-WINS(4104)      4    IP: 0.0.0.0

9     Tunnelling-Protocol(4107)      4    96

10     Banner(4111)      0    0x00002aaad2580328   ** Unresolved Attribute **

11     Group-Policy(4121)      8    "NOACCESS"

12     Split-Tunnel-Inclusion-List(4123)      8    ""

13     Default-Domain-Name(4124)      0    0x00002aaad2580331   ** Unresolved Attribute **

14     Secondary-Domain-Name-List(4125)      0    0x00002aaad2580332   ** Unresolved Attribute **

15     Split-Tunneling-Policy(4151)      4    0

16     Group-giaddr(4157)      4    IP: 0.0.0.0

17     WebVPN SVC Keepalive interval(4203)      4    20

18     WebVPN SVC Client DPD period(4204)      4    30

19     WebVPN SVC Gateway DPD period(4205)      4    30

20     WebVPN SVC Rekey period(4206)      4    0

21     WebVPN SVC Rekey method(4207)      4    0

22     WebVPN SVC Compression(4208)      4    0

23     WebVPN SVC Firewall Rule(4211)     17    "public#,private#,"

24     WebVPN SVC DTLS Compression(4213)      4    0

25     WebVPN SVC DTLS enable(4219)      4    1

26     WebVPN SVC MTU(4221)      4    1406

27     CVC-Modules(4223)      4    "dart"

28     CVC-Profile(4224)     11    "FTD03#user,"

29     CVC-Ask(4227)      4    2

30     CVC-Ask-Timeout(4228)      4    0

31     VLAN ID(4236)      4    0

32     WebVPN Idle timeout alert interval(4244)      4    1

33     WebVPN Session timeout alert interval(4245)      4    1

34     SVC ignore DF bit(4326)      4    0

35     Configure the behaviour of DNS queries by the client when Split tunneling is enabled(4328)      4    0

36     Primary-IPv6-DNS(4329)     16    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  37     Secondary-IPv6-DNS(4330)     16    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  38     Client Bypass Protocol(4331)      4    0

39     IPv6-Split-Tunneling-Policy(4332)      4    0

Tunnel Policy Access-Lists:

user_acl[0] = NULL

user_acl[1] = NULL

Auth Status = ACCEPT

aaai_internal_cb: handle is 31, pAcb is 0x00002aaad352bc80, pAcb->tq.tqh_first is 0x0000000000000000

AAA API: In aaa_close

Checking simultaneous login restriction (max allowance=3) for user cisco1

AAA task: aaa_process_msg(0x00002b4ad7423b20) received message type 2

In aaai_close_session (31)

AAA API: In aaa_send_acct_start