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Technical Tip: Using certificate as additional authentication factor for users with FortiToken

Forum|Forum|5 years ago
June 30, 2021
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Description
This article provides a configuration sample for utilizing an SSL VPN user with FortiToken as a second factor of authentication and the certificate verification as additional authentication factor.

Scope
For version 6.4.5 and upper.

Solution
1) Create a user with a FortiToken:

# config user local
   edit "userA"
        set type ldap                   <----- Any user type can be used (does not necessarily have to be LDAP user).
        set two-factor fortitoken
        set fortitoken "FTKMOBXXXXXXXX"
        set email-to "aaa@lab.lab"
        set ldap-server "LDAP_lab"
end

2) Import the CA certificate that signed the certificate which will be used for the authentication:
Go to System -> Certificates -> Import -> CA Certificate.

3) Define the certificate matching criteria:

# config user peer
edit "test"
set ca "CA_Cert_1" <----- It is possible to set up additional certificate matching criteria.
end

NOTE.
Machine/computer certificates can be utilized as well.

4) Create a binding between the user and the certificate check:

# config vpn ssl settings
# config authentication-rule
   edit 1
        set users "userA"
        set portal "full-access"
        set client-cert enable
        set user-peer "test"
   end
end

5) The firewall policy is set only with the user defined in step 1).

# config firewall policy
   edit 1
        set srcintf "ssl.root"
        set dstintf "port1"
        set srcaddr "SSLVPN_pool"
        set dstaddr "example.com"
        set action accept
        set schedule "always"
        set service "ALL"
        set logtraffic all
        set users "userA"
        set nat enable
   next
end