Cisco ISE Demo Script
The purpose of this blog entry is to to detail in the simplest wat key ISE functionalities and lay them out so that it could be easily reviewed/demoed.
We will cover the following in the order below. Please note that the some sections could have configuration dependencies from the sections before it.
At some point I will upload the configs based on each sections. Please feel free to reach out to me meanwhile.
Basic Wired DOT1.X Authentication (Allow access to deny completely)
Basic Wired DOT1.X Authentication with Change of VLAN/DACL
Basic Discovery and Profiling Example with Switch sending Data to ISE
snmp-server community snmp_ro RO snmp-server trap-source Vlan1 snmp-server source-interface informs vlan1 snmp-server enable traps snmp authentication linkdown linkup coldstart warmstart snmp-server enable traps snmp-server host 188.8.131.52 version 2c snmp_ro
NOTE that 802.1X Works at the Layer 2 level and there is no IP communication at this level. Good review of the process here : https://en.wikipedia.org/wiki/IEEE_802.1X
Basic Wired DOT1.X Authentication (Allow access to network or deny completely)
In this lab setup the switchport either authorsises the devices if the right credential is provided or completely denies access and the devices gets APIPA IP .
dot1.x configuration flow consists of configuring three main sections.
- The Switch to which the endpoint is connected : AAA and DOT1X related config.
- The ISE Server with the details of the Switch and the end user
- The End Point itself for
In the topology below we will configure the Switch , ISE and the Win devices. Very basic connectivity is already setup as show int the topology.
Lets start with the Switch
Different types of Host Authentication Modes
single-host - Exactly one MAC Address
multi-host - One MAC Address opens the door , and rest (other VMs on the Host) can get in easily without authentication.
multi-domain - Has nothing to do with AD Domain , its about multiple VLANs like voice and data vlan.
multi-auth - Every single MAC Address has to be authenticated . Even the VMs has to be authenticated .
The code below is commented and sequenced accordign the steps required.
!Make sure a enable password is set enable secret 5 $1$AGpH$kIw79LdzMFQ395d/ !Enable AAA system aaa new-model !Point to ISE aaa group server radius ISE-group server name ISE ! radius server ISE address ipv4 192.168.1.101 auth-port 1812 acct-port 1813 key **sharedsecret_with_ISE** !Configure shell login to use enable secret details aaa authentication login default enable ! Use the Radius Authentication for dot1x aaa authentication dot1x default group radius !Authorization is for Dynamic VLANs and ACLs to be assigned aaa authorization network default group radius !Default method for account is RADIUS aaa accounting dot1x default start-stop group radius !Include IP Address of the supplicant IP Address of the suplicant as a part of the request. radius-server attribute 8 include-in-access-req !Globally enabling Dot1X Authentication dot1x system-auth-control !Default the port on which the endpoint is connected to reset config default interface GigabitEthernet1/2 !Switchport configuration details interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 spanning-tree portfast ! Open mode for testing authentication open ! Authentication mode , see above for what each mode means authentication host-mode multi-auth authentication port-control auto ! Recurring authentication authentication periodic ! Let server decide on how often to re-athenticate authentication timer reauthenticate server ! Set port access entity as the autheticator dot1x pae authenticator ! Supplicant retry timeout dot1x timeout tx-period 10 !Ensure the following for reachability from switch to ISE interface Vlan1 ip address 192.168.1.102 255.255.255.0 ! ! Some default configs aaa session-id common !
Copy Paste Snippet (Modify Here)
hostname SW1 enable secret cisco123! aaa new-model ! aaa group server radius ISE-group server name ISE ! radius server ISE address ipv4 184.108.40.206 auth-port 1812 acct-port 1813 key cisco123! ! aaa authentication login default enable aaa authentication dot1x default group radius aaa authorization network default group radius aaa accounting dot1x default start-stop group radius ! radius-server attribute 8 include-in-access-req ! dot1x system-auth-control ! default interface GigabitEthernetX/X ! ! # In this example we will notice , that if authentication does not ! # success , the port is not able to get into VLAN1 and hence no ! # IP Address is received . ! # show authentication port ..... ... ... ! # ! # Once the right password is supplied , the device gets into VLAN1 ! # gets the IP Address ! # interface GigabitEthernetX/X switchport mode access switchport access vlan 1 spanning-tree portfast authentication open authentication host-mode multi-auth authentication port-control auto authentication periodic authentication timer reauthenticate server dot1x pae authenticator dot1x timeout tx-period 10 ! Make sure connectivity to ISE interface Vlan1 ip address 220.127.116.11 255.255.255.0 no shut ! ! aaa session-id common !
! # Here we actually lock the port down. with "no auth open" interface GigabitEthernet0/0 no authentication open authentication host-mode single-host
Lets configure ISE now
OPTIONAL Set the ISE Password to be less restrictive
Add the User “bob” with password “cisco123!”
Add the Switch SW1 with RADIUS “cisco123!” This basically lest the switch to communication via RADIUS to ISE
debug aaa test aaa group ISE-group bob cisco123! new-code
Finally lets enable the PC to do DOT1.X
services.msc --> Wired Auto Config --> Start
do debug radius authentication show dot1x all debug aaa test aaa group ISE-group bob cisco123! new-code show authentication sessions interface gi1/2
Basic Wired DOT1.X Authentication with Change of VLAN
No Additional switch configuration is required for the change of VLAN/DACL
This builds upon the lab above. Instead of blatenlty denying network access to the user , we put in on a separate VLAN.
Make sure the user is moved under a user group
Create and Authorization Profile to set the VLAN to 30 or whatever
Set the Policy set (Authorization Policy)
And that is it!
Now let the user
bob login and the switchport vlan should change to the desired VLAN.
Configuring DACL is pretty much the same as the VLAN change above.
- Make the DACL
- Add the DACL to the Authorization to the Profiles
- Now re-authenticate the PC and you should see new ACLs on the switch (show ip access-list)
Notice the deny to 18.104.22.168 ```sh Switch# sh authentication sessions interface gigabitEthernet 2/0/1 details
Interface: GigabitEthernet2/0/1 MAC Address: 9457.a5b0.0ade IPv6 Address: Unknown IPv4 Address: Unknown User-Name: 94-57-A5-B0-0A-DE Status: Authorized Domain: DATA Oper host mode: multi-auth Oper control dir: both Session timeout: N/A Common Session ID: 0A0000640000012B75977C34 Acct Session ID: 0x00000039 Handle: 0xE7000033 Current Policy: POLICY_Gi2/0/1
Service Template: DEFAULT_LINKSEC_POLICY_SHOULD_SECURE (priority 150)
ACS ACL: xACSACLx-IP-PERMIT_ALL_TRAFFIC-57452910
Method status list:
Method State dot1x Stopped mab Authc Success
4. **Now check the ping front the PC and you should not be able to ping 22.214.171.124 anymore** !(/assets/markdown-img-paste-20181105232306747.png) # Lets enable SSH Auth via ISE for a IOS Router ```sh ip domain-name cisco.com crypto key generate rsa modulus 1024 aaa new-model ! aaa authentication login NOAUTH none ! line con 0 login authentication NOAUTH ! radius server lab_ise address ipv4 X.X.X.X auth-port 1645 acct-port 1646 key cisco123! ! aaa group server radius ISE server name lab_ise ! aaa authentication login FOR_SSH group ISE aaa authorization exec FOR_SSH group ISE if-authenticated ! line vty 0 4 authorization exec FOR_SSH login authentication FOR_SSH transport input ssh session-timeout 1440 exec-timeout 0
In this lab we will have 3 different compliance status configured on ISE
In relation to above , we will have three DACLs
- DACL_UNKNOWN_POSTURE : DACL when the posture is not known.
- DACL_INTERNET_ONLY_NON_COMPLIANT_POSTURE : DACL when the end user denies to to meet the posture requirements and do the actions necesary for the same.
- DACL_COMPLIANT_POSTURE : This is when the the User is deemed compliant by ISE.
And corresponding three Authorization Profiles respective to above DALCs
- AUTH_PROF_UNKNOWN_POSTURE : DACL when the posture is not known.
- AUTH_PROF_INTERNET_ONLY_NON_COMPLIANT_POSTURE : DACL when the end user denies to to meet the posture requirements and do the actions necesary for the same.
- AUTH_PROF_COMPLIANT : This is when the the User is deemed compliant by ISE.
We are going to use the Workcenter for Posture
The workflow is to move from Left to Right
As a Next Step we ensure that the Dot1X Configuration is done on the switch and is added to the ISE
For the client provisioning the workflow looks like this :
Next we create a Posture Profile (XML) file to be used by the Anyconnect client
In this section we define the characteristics of the client on what it should be doign based on the XML file:
Server Name Rule is Mandatory (We keep it as * (All))
Ensure that the compliance Module is present
Now that the profile is configured and we configure the the actual anyconnect software package.
We leave the “Client Provisioning Portal” as default (Its a straight forward config)
FOR NOW WER ARE NOT DOING ANY POLICY ELEMENT /POSTURE CHECK AND ENSURE THAT THE CLIENT IS ABLE TO DOWNLOAD THE ANYCONNECT MODULE
NOW Leats create the Different DACLs we discussed above
!DHCP/DNS permit udp any eq bootpc any eq bootps permit udp any any eq 53 ! The Only IP our client needs to talk to PSNs permit ip any host ISE_SERVER_IP_ADDRESS_1 permit ip any host ISE_SERVER_IP_ADDRESS_2 deny ip any any
Denying all traffic to RFC 1918 Local address and only allowinf internet traffic.
!DHCP/DNS permit udp any eq bootpc any eq bootps permit udp any any eq 53 ! The Only IP our client needs to talk to PSNs permit ip any host ISE_SERVER_IP_ADDRESS_1 permit ip any host ISE_SERVER_IP_ADDRESS_2 ! Deny Traffic to all local RFC1918 Networks (Allowing Internet Only) deny ip any any 10.0.0.0 0.255.255.255 deny ip any 172.16.0.0 0.255.255.255 deny ip any 192.168.0.0 0.0.255.255 permit ip any any
Allow all traffic
permit udp any eq bootpc any eq bootps permit udp any any eq 53 permit ip any host 126.96.36.199 permit ip any any permit tcp any any permit icmp any any
AN ACL On the switch is required which will redirect the web traffic to the posture page
!ACL_REDIRECT ! # Will no redirect DNS/DHCP or ISE Connections deny udp any eq bootpc and eq bootps deny udp any any eq domain deny ip any host 188.8.131.52 ! # But will redirect HTTP/HTTP Traffic permit tcp any any eq www permit tcp any any eq 443
Now Create the Authorization Profiles
FOR NOW WE WILL SKIPP TO THE POSTURE POLICY AND MOVE TO POLICY SETS TO ENURE OUR CONFIG SO FAR IS WORKKIGN
Now Create the Respective Authorization Rules
1. ip access-list extended ISE-POSTURE-REDIRECT deny icmp any any deny udp any any eq domain deny udp any eq bootpc any eq bootps remark ISE deny ip any host 10.104.99.103 deny ip any host 10.103.2.105 deny tcp any any eq 8905 remark PROXY deny ip any host 10.104.164.235 deny ip any host 10.104.164.236 permit tcp any any eq 443 permit tcp any any eq 8080 permit tcp any any eq www deny ip any any
DACL permit ip any host 10.104.99.103 permit ip any host 10.104.99.204 permit ip any host 10.104.164.203 permit ip any host 10.104.164.102 permit ip any host 10.103.2.105 permit icmp any any permit udp any any eq domain deny ip any any
ip http port 8080
· ip port-map http port 8080
ip access-list extended ACL-POSTURE-REDIRECT deny ip any host 10.24.218.254 deny ip any 10.75.250.228 0.0.0.3 deny ip any host 184.108.40.206 deny ip any host 220.127.116.11 deny ip any host 18.104.22.168 deny ip any host 22.214.171.124 deny ip any host 126.96.36.199 deny ip any host 188.8.131.52 permit tcp any any eq www permit tcp any any eq 443
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