Cisco ASA – AnyConnect Authentication via LDAP and Domain User Groups

KB ID 0001152

Problem

When I first started doing Cisco remote VPNs, we had Server 2000/2003 and I used to use RADIUS with IAS. Then Microsoft brought out 2008/2012 and RADIUS via NAP. Because I fear and loath change I swapped to using Kerberos VPN Authentication for a while. I had to put in an ASA5512-X this weekend and the client wanted to allow AnyConnect to a particular Domain Security Group “VPN-Users”, so I thought I would use LDAP for a change.

The process is to setup AAA for LDAP, then create an ‘Attribute map’ for the domain group, and then map that group to a particular ASA Tunnel Group/ASA Group Policy. Though to be honest if you have multiple groups and want to assign different levels of access (i.e. different ACLs etc.) then using a blend of LDAP and Cisco Dynamic Access Policies (DAP) is a lot simpler.

I’ll post both options, and you can take your pick

Solution

Firstly you need to create a ‘service account’ in Active Directory that the ASA will use, it only need to be able to browse the AD, so a simple Domain User is fine.

Cisco ASA Service Account

Then create a user group that you want to grant AnyConnect Access to;

AnyConnect Remote VPN Group

And, then create a test user and put that user in your domain group.

Group Membership AnyConnect

Configure the ASA for LDAP

Create an AAA LDAP Server Group > Add a Server > Put in the Config for that server like so;

CHANGE THE ENTRIES IN BOLD BELOW TO MATCH YOUR REQUIREMENTS

Type help or '?' for a list of available commands.
Petes-ASA> enable
Password: ********
Petes-ASA# configure terminal
Petes-ASA(config)# aaa-server PNL-LDAP-SERVER protocol ldap 
Petes-ASA(config-aaa-server-group)# aaa-server PNL-LDAP-SERVER (inside) host 192.168.100.10
Petes-ASA(config-aaa-server-host)# ldap-base-dn dc=pnl,dc=com     
Petes-ASA(config-aaa-server-host)# ldap-scope subtree 
Petes-ASA(config-aaa-server-host)# ldap-naming-attribute sAMAccountName
Petes-ASA(config-aaa-server-host)# ldap-login-password P@assword123
Petes-ASA(config-aaa-server-host)# ldap-login-dn cn=asa,OU=ServiceAccounts,OU=PNL,dc=pnl,dc=com
Petes-ASA(config-aaa-server-host)# server-type auto-detect 
Petes-ASA(config-aaa-server-host)# exit
Petes-ASA(config)# exit
Petes-ASA# 

Now perform a test, and make sure it says “successful’

NOTE: HERE I'VE SET IT TO FALL BACK TO LOCAL AUTH IF THE LDAP SERVER IS DOWN!
Petes-ASA# test aaa-server authentication PNL-LDAP-SERVER host 192.168.100.10 username 
administrator password P@ssword123
INFO: Attempting Authentication test to IP address  (timeout: 12 seconds)
INFO: Authentication Successful

Add LDAP Authentication For AnyConnect

I’m assuming you already have AnyConnect Setup? If not that’s fine simply follow the article below, which will set it up for LOCAL authentication, set it up and get it working then come back here.

Cisco ASA 5500 AnyConnect Setup From Command Line

To change authenticationย from LOCAL you make a change in the Tunnel-Group for you remote VPN connection, if you don’t know what the name of your tunnel group is ‘show run tun’ will list them. You add the authentication-server-group to the general-attributes section of the config, like so;

NOTE: HERE IT WILL FAIL BACK TO 'LOCAL' AUTH IF LDAP GOES DOWN (THIS IS GOOD!)

Petes-ASA(config)# tunnel-group PNL-TG-ANYCONNECT-ACCESS general-attributes
Petes-ASA(config-tunnel-general)# authentication-server-group PNL-LDAP-SERVER LOCAL
Petes-ASA(config-tunnel-general)# exit
Petes-ASA(config)# write mem
Building configuration...
Cryptochecksum: 30899474 8c9cd7c6 495be299 fd911bca 

19681 bytes copied in 3.340 secs (6560 bytes/sec)
[OK]
Petes-ASA(config)# 

Note: At this point ALL DOMAIN USERS can successfully authenticate, to lock it down to one domain security group, either apply a Dynamic Access Policy (these can only be done in the ASDM). or skip further down, to edit and create your group-policies and use an attribute-map.

Cisco ASDM Configure Dynamic Access Policies

Connect to the ASDM > Configuration > Remote Access VPN > Dynamic Access Policies > Add.

ASA Dynamic Access Policy

Add an LDAP Condition > IF NOT a member (or not equal to member) > Insert domain security group. Then set the condition to ‘Terminate’.

AnyConnect Based on AD Group

Then test.Filter AnyConnect Group Membership

Configure Group Access via Attribute Map

As already pointed out I’m assuming you already have AnyConnect in and working, so you will have both a Group-Policy your users are using, and a tunnel-group configured, we will make some changes to those. if you don’t know thew name of your configured group-policy or tunnels group the following two commands will tell you;

  • To see your tunnel group(s): show run tun
  • To see your group-policy(s): show run group-policy

Note: If you have many, simply connect with a user, then run show vpn-sessiondb det anyconnect to get the details.

Firstly create a NEW group-policy that blocks access (this will become the default).

Petes-ASA(config)# group-policy ANYCONNECT-NO-ACCESS internal
Petes-ASA(config)# group-policy ANYCONNECT-NO-ACCESS attributes
Petes-ASA(config-group-policy)#  vpn-simultaneous-logins 0
Petes-ASA(config-group-policy)# exit

Then we will change your EXISTING group-policy to change the simultaneous login threshold

Petes-ASA(config)# group-policy GroupPolicy_ANYCONNECT-PROFILE attributes
Petes-ASA(config-group-policy)#  vpn-simultaneous-logins 3
Petes-ASA(config-group-policy)# exit

Then we will change your EXISTING tunnel-group to change the authentication method, and set the default group-policy to ‘deny’. Note: Ive added the ASA’s local user database as a fall-back in case the LDAP server(s) are down/not-contactable.

Petes-ASA(config)# tunnel-group ANYCONNECT-PROFILE general-attributes
Petes-ASA(config-tunnel-general)#  authentication-server-group PNL-LDAP-SERVER LOCAL
Petes-ASA(config-tunnel-general)#  default-group-policy ANYCONNECT-NO-ACCESS
Petes-ASA(config-tunnel-general)# exit

Create an Attribute map, that matches the AD group that has your ‘allowed’ users in it.

Petes-ASA(config)# ldap attribute-map AM-ANYCONNECT-USERS
Petes-ASA(config-ldap-attribute-map)#   map-name  memberOf Group-Policy
Petes-ASA(config-ldap-attribute-map)#   map-value memberOf CN=VPN-Users,OU=Groups,OU=PNL,DC=pnl,DC=com GroupPolicy_ANYCONNECT-PROFILE
Petes-ASA(config-ldap-attribute-map)# exit

Finally add that Attribute map, to the LDAP server you created earlier.

Petes-ASA(config)# aaa-server PNL-LDAP-SERVER (inside) host 192.168.100.10
Petes-ASA(config-aaa-server-host)#  ldap-attribute-map AM-ANYCONNECT-USERS

Then test;

LDAP Group Logon AnyConnect

ย 

Related Articles, References, Credits, or External Links

Cisco AnyConnect โ€“ Allow Domain Password Change via LDAP

Thanks to Ben Monroe, who emailed me as the original article was lacking the Attribute Map section. I had omitted it originally and stuck with DAP, primarily because I could not get LDAP group authentication to work! I still prefer DAP as a solution, but for the sake of completeness I revisited this, and added the complete LDAP procedure.

Author: PeteLong

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20 Comments

  1. Hi,

    Thanks for the article, but I have one question, from the configuration I do not see how actually asa checks that authenticating user is a member of VPNUser group.. Any ideas?

    Kind regards,

    Post a Reply
    • With LDAP alone, It wont work, you need the DAP as well (Cisco might argue) but I’d ask them to show me a working LDAP only config before I would believe them ๐Ÿ™‚

      P

      Post a Reply
  2. Great ๐Ÿ™‚

    I checked Cisco how to guides, it confused me ๐Ÿ™‚

    Yours one: Simple and clear ๐Ÿ™‚

    Thanks a lot!!!

    Post a Reply
  3. It works! I was trying to map ldap attribute 2 days until I foud this article! it took me 2 min ๐Ÿ™‚
    thanks!!

    Post a Reply
  4. Amazing article! The documentation and the threads in Cisco’s forum are so confusing. This article is spot on! Thank you.

    Post a Reply
  5. All I can say is thanks! Wasted two days on trying to get ASA LDAP Attribute Mapping working. DAP is the way to go. Followed PeteLongs steps and in 2 minutes we are up and running using AD Group authentication for VPN! I can see many other policies that we can now set as well. Thanks once again for your post!

    Post a Reply
    • No problem, thanks for the feedback.
      P

      Post a Reply
  6. I wish Google had put your page at the top of the search results. Like everyone else, I have been struggling with LDAP Mapping, but your explanation is easy and makes perfect sense. Thanks for publishing this.

    Post a Reply
    • ThanQ – I wish I was also at the top ๐Ÿ™‚

      Post a Reply
  7. I need multiple Group-Profile match and authenticate with different LDAP group. Any idea?

    Thanks

    Post a Reply
    • A Better solution is to use RADIUS then (depending on the group membership) pass the group policy back in the RADIUS reply.
      Pete

      Post a Reply
      • How do I add this DAP to a specific group policy and not to others
        For instance, I only want this DAP to apply to a specific remote access vpn tunnel profile/group-policy
        I have multiple tunnel-profiles and group-policy
        Does this one DAP apply to one tunnel-profile/group policy both for client/clientless ssl vpns?

        Post a Reply
        • You can’t unfortunately they are global ๐Ÿ™

          Post a Reply
  8. If I have two ISPs with different IP address can I use both of them to access remote vpn ?
    Or only one IP aadress can work.

    Post a Reply
    • Great Question! You can access AnyConnect via either public IP, you would need to have both IP addresses registered against the public domain name. And you would need to enable it on both interfaces, and have mirrored NAT rules. (unless you had (inside, any) and not (inside,outside) for example).

      P

      Post a Reply
  9. I need to allow users to change their passwords at the VPN login screen. And to let them know their password is expiring in x days. They already log in using their domain account.

    Post a Reply
    • I’ve added the link to the bottom of the page.

      Pete

      Post a Reply
  10. FYI – DAP is incompatible with DUO SAML MFA. We’re now trying to tear down our DAP policy to make our ASA usable with DUO.

    Post a Reply
  11. Awesome article. Thank you so much for your knowledge.

    Post a Reply

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