SSL VPN with RADIUS password renew on FortiAuthenticator

This is a sample configuration of SSL VPN for RADIUS users with Force Password Change on next logon. In this example, the RADIUS server is a FortiAuthenticator. A user test1 is configured on FortiAuthenticator with Force password change on next logon.

Sample topology

Sample configuration

WAN interface is the interface connected to ISP. This example shows static mode. You can also use DHCP or PPPoE mode. The SSL VPN connection is established over the WAN interface.

To configure SSL VPN using the GUI:

1. Configure the interface and firewall address. The port1 interface connects to the internal network.
   1. Go to Network > Interfaces and edit the wan1 interface.
   2. Set IP/Network Mask to 172.20.120.123/255.255.255.0.
   3. Edit port1 interface and set IP/Network Mask to 192.168.1.99/255.255.255.0.
   4. Click OK.
   5. Go to Policy & Objects > Address and create an address for internet subnet 192.168.1.0.
2. Create a RADIUS user.
   1. Go to User & Authentication > RADIUS Servers to create a user.
   2. Set Authentication method to MS-CHAP-v2.
   3. Enter the IP/Name and Secret.
   4. Click Create.

      Password renewal only works with the MS-CHAP-v2 authentication method.

   5. To enable the password-renew option, use these CLI commands.

      config user radius
          edit "fac"
              set server "172.20.120.161"
              set secret <fac radius password>
              set auth-type ms_chap_v2
              set password-renewal enable
          next
      end

3. Configure user group.
   1. Go to User & Authentication > User Groups to create a user group.
   2. For the Name, enter fac-group.
   3. In Remote Groups, click Add to add Remote Server you just created.
4. Configure SSL VPN web portal.
   1. Go to VPN > SSL-VPN Portals to edit the full-access portal.

      This portal supports both web and tunnel mode.

   2. Disable Enable Split Tunneling so that all SSL VPN traffic goes through the FortiGate.
5. Configure SSL VPN settings.
   1. Go to VPN > SSL-VPN Settings.
   2. Select the Listen on Interface(s), in this example, wan1.
   3. Set Listen on Port to 10443.
   4. Set Server Certificate to the authentication certificate.
   5. Under Authentication/Portal Mapping, set default Portal web-access for All Other Users/Groups.
   6. Create new Authentication/Portal Mapping for group fac-group mapping portal full-access.
6. Configure SSL VPN firewall policy.
   1. Go to Policy & Objects > Firewall Policy.
   2. Fill in the firewall policy name, in this example, sslvpn certificate auth.
   3. Incoming interface must be SSL-VPN tunnel interface(ssl.root).
   4. Set the Source Address to all and Source User to fac-group.
   5. Set the Outgoing Interface to the local network interface so that the remote user can access the internal network, in this example, port1.
   6. Set Destination Address to the internal protected subnet 192.168.1.0.
   7. Set Schedule to always, Service to ALL, and Action to Accept.
   8. Enable NAT.
   9. Configure any remaining firewall and security options as desired.
   10. Click OK.

To configure SSL VPN using the CLI:

1. Configure the interface and firewall address.

   config system interface 
       edit "wan1"
           set vdom "root"
           set ip 172.20.120.123 255.255.255.0
       next
   end

2. Configure internal interface and protected subnet, then connect the port1 interface to the internal network.

   config system interface
       edit "port1"
           set vdom "root"
           set ip 192.168.1.99 255.255.255.0
       next
   end

   config firewall address
       edit "192.168.1.0"
           set subnet 192.168.1.0 255.255.255.0
       next
   end

3. Configure the RADIUS server.

   config user radius
       edit "fac"
           set server "172.18.58.107"
           set secret <fac radius password>
           set auth-type ms_chap_v2
           set password-renewal enable
       next
   end

4. Configure user group.

   config user group
       edit "fac-group"
           set member "fac"
       next
   end

5. Configure SSL VPN web portal.

   config vpn ssl web portal
       edit "full-access"
           set tunnel-mode enable
           set web-mode enable
           set ip-pools "SSLVPN_TUNNEL_ADDR1"
           set split-tunneling disable
       next
   end

6. Configure SSL VPN settings.

   config vpn ssl settings
       set servercert "server_certificate"
       set tunnel-ip-pools "SSLVPN_TUNNEL_ADDR1"
       set source-interface "wan1"
       set source-address "all"
       set default-portal "web-access"
       config authentication-rule
           edit 1
               set groups "fac-group"
               set portal "full-access"
           next        
       end
   end

7. Configure one SSL VPN firewall policy to allow remote user to access the internal network.

   config firewall policy 
       edit 1
           set name "sslvpn web mode access"
           set srcintf "ssl.root"
           set dstintf "port1"
           set srcaddr "all"
           set dstaddr "192.168.1.0"
           set groups “fac-group”
           set action accept
           set schedule "always"
           set service "ALL"
           set nat enable
       next
   end

To see the results of web portal:

1. From a remote device, use a web browser to log into the SSL VPN web portal http://172.20.120.123:10443.
2. Log in using the test1 credentials.

   Use a user which is configured on FortiAuthenticator with Force password change on next logon.

3. Click Login. You are prompted to enter a new password.
4. Go to VPN > Monitor > SSL-VPN Monitor to verify the user’s connection.

To see the results of tunnel connection:

1. Download FortiClient from www.forticlient.com.
2. Open the FortiClient Console and go to Remote Access > Configure VPN.
3. Add a new connection.
   • Set the connection name.
   • Set Remote Gateway to the IP of the listening FortiGate interface, in this example, 172.20.120.123.
4. Select Customize Port and set it to 10443.
5. Save your settings.
6. Log in using the test1 credentials.

   You are prompted to enter a new password.

To check the SSL VPN connection using the GUI:

1. Go to VPN > Monitor > SSL-VPN Monitor to verify the user’s connection.
2. Go to Log & Report > Events and select VPN Events from the event type dropdown list to view the details of the SSL VPN connection event log.
3. Go to Log & Report > Forward Traffic to view the details of the SSL VPN traffic.

To check the web portal login using the CLI:

get vpn ssl monitor
SSL VPN Login Users:
 Index   User    Auth Type    Timeout    From           HTTP in/out   HTTPS in/out
 0       test1   1(1)         229        10.1.100.254   0/0           0/0

SSL VPN sessions:
 Index   User    Source IP      Duration        I/O Bytes       Tunnel/Dest IP

To check the tunnel login using the CLI:

get vpn ssl monitor
SSL VPN Login Users:
 Index   User    Auth Type    Timeout   From           HTTP in/out  HTTPS in/out
 0       test1   1(1)         291       10.1.100.254   0/0          0/0

SSL VPN sessions:
 Index   User    Source IP      Duration   I/O Bytes      Tunnel/Dest IP 
 0       test1   10.1.100.254   9          22099/43228    10.212.134.200