SSL VPN with RADIUS and FortiToken mobile push on FortiAuthenticator

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SSL VPN with RADIUS and FortiToken mobile push on FortiAuthenticator

This topic provides a sample configuration of SSL VPN that uses FortiAuthenticator as a RADIUS authentication server and FortiToken Mobile Push two-factor authentication. If you enable push notifications, the user can easily accept or deny the authentication request.

Sample network topology

Sample configuration

To configure FortiAuthenticator using the GUI:

  1. Add a FortiToken mobile license on the FortiAuthenticator.
    1. On the FortiAuthenticator, go to Authentication > UserManagement > FortiTokens. Click Create New.
    2. Set Token type to FortiToken Mobile and enter the FortiToken Activation codes.
  2. Create the RADIUS client (FortiGate) on the FortiAuthenticator.
    1. On the FortiAuthenticator, go to Authentication > RADIUS Service > Clients to add the FortiGate as a RADIUS client OfficeServer).
    2. Enter the FortiGate IP address and set a Secret.

The secret is a pre-shared secure password that the FortiGate uses to authenticate to the FortiAuthenticator.

  1. Set Authentication method to Enforce two-factorauthentication.
  2. Select Enable FortiToken Mobile push notifications authentication.
  3. Set Realms to local |Local users.
  1. Create a user and assign FortiToken Mobile to the user on the FortiAuthenticator.
    1. On the FortiAuthenticator, go to Authentication > UserManagement > Local Users to create a user sslvpnuser1.
    2. Enable Allow RADIUS authentication and click OK to access additional settings.
    3. Enable Token-based authentication and select to deliver the token code by FortiToken.
    4. Select the FortiToken added from the FortiToken Mobile dropdown menu.
    5. Set Delivery method to Email and fill in the UserInformation
    6. Go to Authentication > UserManagement > UserGroups to create a group sslvpngroup.
    7. Add sslvpnuser1 to the group by moving the user from Available users to Selected users.
  2. Install the FortiToken Mobile application on your smartphone, for Android or iOS.

The FortiAuthenticator sends the FortiToken Mobile activation to the user’s email address.

  1. Activate the FortiToken Mobile through the FortiToken Mobile application by either entering the activation code or by scanning the QR code.

To configure SSL VPN using the GUI:

  1. Configure the interface and firewall address.

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.

Port1 interface connects to the internal network.

  1. Go to Network > Interface and edit the wan1
  2. Set IP/Network Mask to 20.120.123/255.255.255.0.
  3. Edit port1 interface and set IP/Network Mask to 168.1.99/255.255.255.0.
  4. Click OK.
  5. Go to Firewall & Objects > Address and create an address for internet subnet 168.1.0.
  1. Create a RADIUS user and user group.
    1. On the FortiGate, go to User& Device > RADIUS Servers to create a user to connect to the RADIUS server

(FortiAuthenticator).

  1. For Name, use FAC-RADIUS.
  2. Enter the IP address of the FortiAuthenticator, and enter the Secret created above.
  3. Click Test Connectivity to ensure you can connect to the RADIUS server.
  4. Select Test UserCredentials and enter the credentials for sslvpnuser1.

The FortiGate can now connect to the FortiAuthenticator as the RADIUS client.

  1. Go to User& Device > UserGroups and click Create New to map authenticated remote users to a user group on the FortiGate.
  2. For Name, use SSLVPNGroup.
  3. In Remote Groups, click Add.
  4. In the Remote Server dropdown list, select FAC-RADIUS.
  5. Leave the Groups field blank.
  1. Configure SSL VPN web portal.
    1. Go to VPN > SSL-VPN Portals to edit the full-access

This portal supports both web and tunnel mode.

  1. Disable Enable Split Tunneling so that all SSL VPN traffic goes through the FortiGate.
  1. Configure SSL VPN settings.
    1. Go to VPN > SSL-VPN Settings.
    2. Choose proper Listen on Interface, in this example, wan1.
    3. Listen on Port 10443.
    4. Set ServerCertificate to the authentication certificate.
    5. Under Authentication/Portal Mapping, set default Portal web-access for All OtherUsers/Groups.
    6. Create new Authentication/Portal Mapping for group sslvpngroup mapping portal full-access.
  2. Configure SSL VPN firewall policy.
    1. Go to Policy & Objects > IPv4 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 sslvpngroup.
    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 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

Configure internal interface and protected subnet. Connect Port1 interface to 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 subnet192.168.1.0 255.255.255.0

next

end

  1. Create a RADIUS user and user group.

config user radius edit “FAC-RADIUS” set server “172.20.120.161” set secret <FAC client secret>

next

end

config user group edit “sslvpngroup” set member “FAC-RADIUS”

next end

  1. 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

  1. 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 “sslvpngroup” set portal “full-access”

next

end

  1. Configure SSL VPN firewall policy.

Configure one 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 “sslvpngroup” 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, open a web browser and log into the SSL VPN web portal http://172.20.120.123:10443.
  2. Log in using the sslvpnuser1

The FortiAuthenticator pushes a login request notification through the FortiToken Mobile application.

  1. Check your mobile device and select Approve.

When the authentication is approved, sslvpnuser1 is logged into the SSL VPN portal.

  1. On the FortiGate, go to Monitor> SSL-VPN Monitor to confirm the user connection.

To see the results of tunnel connection:

  1. Download FortiClient from 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: 20.120.123.
  4. Select Customize Port and set it to 10443.
  5. Save your settings.
  6. Log in using the sslvpnuser1 credentials and click FTM Push.

The FortiAuthenticator pushes a login request notification through the FortiToken Mobile application.

  1. Check your mobile device and select Approve.

When the authentication is approved, sslvpnuser1 is logged into the SSL VPN tunnel.

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 > 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        sslvpnuser1

SSL VPN sessions:

 1(1) 229      10.1.100.254 0/0      0/0
Index User       Source IP

To check the tunnel login on CLI:

get vpn ssl monitor

SSL VPN Login Users:

 Duration      I/O Bytes       Tunnel/Dest IP
Index User       Auth Type Timeout      From     HTTP in/out   HTTPS in/out
0        sslvpnuser1

SSL VPN sessions:

 1(1) 291      10.1.100.254 0/0      0/0
Index User       Source IP Duration      I/O Bytes       Tunnel/Dest IP
0        sslvpnuser1 10.1.100.254 9       22099/43228    10.212.134.200
This entry was posted in Administration Guides, FortiGate, FortiOS 6.2 on by .

About Mike

Michael Pruett, CISSP has a wide range of cyber-security and network engineering expertise. The plethora of vendors that resell hardware but have zero engineering knowledge resulting in the wrong hardware or configuration being deployed is a major pet peeve of Michael's. This site was started in an effort to spread information while providing the option of quality consulting services at a much lower price than Fortinet Professional Services. Owns PacketLlama.Com (Fortinet Hardware Sales) and Office Of The CISO, LLC (Cybersecurity consulting firm).

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