HTTP3 deep inspection, QUIC certificate inspection, DNS over QUIC and DNS over HTTP3 for transparent and local-in DNS modes

The FortiProxy can handle the QUIC/TLS handshake and perform deep inspection for HTTP3 and QUIC traffic, including certificate inspection. This allows for faster and more secure DNS resolution, with improved privacy and reduced latency.

DNS over QUIC (DoQ) and DNS over HTTP3 (DoH3) are also supported in proxy mode inspection for transparent and local-in explicit modes. With DoQ and DoH3, connections can be established faster than with DNS over TLS (DoT) or DNS over HTTPS (DoH).

In transparent mode, the FortiProxy is acting as a proxy, forwarding DNS queries, and not as a DNS server. In local-in DNS mode, the FortiProxy acts as the DNS server and a DNS filter profile is applied in the system DNS server.

DoQ transparent and local-in query can be achieved using tools or applications in Linux, such as the q tiny command line DNS client from Natesales.

DoH3 transparent and local-in query can be achieved in Linux using q or Curl. In Windows, change the client network DNS server to the FortiProxy and treat the FortiProxy as a HTTP3 DNS server listening for DoH3 connections.

To configure DoQ in transparent mode:

Enable QUIC in the ssl-ssh-profile:

config firewall ssl-ssh-profile
    edit "protocols"
        config dot
            set status deep-inspection
            set quic inspect
        end
    next
end

Configure a DNS filter profile:

config dnsfilter profile
    edit "dnsfilter_fgd"
        config ftgd-dns
            config filters
                edit 1
                    set category 30
                    set action block
                next
            end
        end
    next
end

Apply the profiles to a proxy firewall policy:

config firewall policy
    edit 1
        set name "dnsfilter"
        set srcintf "port2"
        set dstintf "port1"
        set action accept
        set srcaddr "all"
        set dstaddr "all"
        set schedule "always"
        set service "ALL"
        set utm-status enable
        set inspection-mode proxy
        set profile-protocol-options "protocol"
        set ssl-ssh-profile "protocols"
        set dnsfilter-profile "dnsfilter_fgd"
        set logtraffic all
        set nat enable
    next
end

Test the configuration:

On the client, use q to query a FortiGuard category30 domain with the Adguard DNS server over QUIC. The default redirect block IP address should be returned:

pc03:~# q www.sfu.ca @quic://dns.adguard.com --tls-no-verify
2023/08/18 18:53:44 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Receive-Buffer-Size for details.
www.sfu.ca. 1m0s A 208.91.112.55
www.sfu.ca. 1m0s AAAA 2620:101:9000:53::55

To configure DoQ in local-in mode:

In the FortiProxy DNS server configuration, enable DoQ for a port with the previously configured DNS filter profile applied:

config system dns-server
    edit "port2"
        set dnsfilter-profile "dnsfilter_fgd"
        set doq enable
    next
end

Test the configuration:

On the client, use q to query a FortiGuard category30 domain with the FortiProxy interface over QUIC. The default redirect block IP address should be returned:

pc03:~# q www.mcgill.ca @quic://10.1.100.150 --tls-no-verify
2023/08/18 20:05:53 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Receive-Buffer-Size for details.
www.mcgill.ca. 1m0s A 208.91.112.55
www.mcgill.ca. 1m0s AAAA 2620:101:9000:53::55

To configure DoH3 in transparent mode:

Enable QUIC in the ssl-ssh-profile:

config firewall ssl-ssh-profile
    edit "protocols"
        config https
            set ports 443 8443
            set status deep-inspection
            set quic inspect
        end
    next
end

Configure a DNS filter profile:

config dnsfilter profile
    edit "dnsfilter_fgd"
        config ftgd-dns
            config filters
                edit 1
                    set category 30
                    set action block
                next
            end
        end
    next
end

Apply the profiles to a proxy firewall policy:

config firewall policy
    edit 1
        set name "dnsfilter"
        set srcintf "port2"
        set dstintf "port1"
        set action accept
        set srcaddr "all"
        set dstaddr "all"
        set schedule "always"
        set service "ALL"
        set utm-status enable
        set inspection-mode proxy
        set profile-protocol-options "protocol"
        set ssl-ssh-profile "protocols"
        set dnsfilter-profile "dnsfilter_fgd"
        set logtraffic all
        set nat enable
    next
end

Test the configuration:

On the client with HTTP3 support, use q or Curl to query a FortiGuard category30 domain with the Adguard DNS server or Cloudflare DNS server over QUIC. The default redirect block IP address should be returned:

pc03:~# q www.mcgill.ca --http3 @https://dns.adguard.com --tls-no-verify
2023/08/18 21:04:02 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Receive-Buffer-Size for details.
www.mcgill.ca. 1m0s A 208.91.112.55
www.mcgill.ca. 1m0s AAAA 2620:101:9000:53::55

pc03:~# curl -H 'accept: application/dns-message' -v -k --http3 'https://1.1.1.1/dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ' | hexdump
*   Trying 1.1.1.1:443...
* Connect socket 5 over QUIC to 1.1.1.1:443
* Sent QUIC client Initial, ALPN: h3,h3-29,h3-28,h3-27
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Connected to 1.1.1.1 (1.1.1.1) port 443 (#0)
* h3 [:method: GET]
* h3 [:path: /dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ]
* h3 [:scheme: https]
* h3 [:authority: 1.1.1.1]
* h3 [user-agent: curl/7.80.0-DEV]
* h3 [accept: application/dns-message]
* Using HTTP/3 Stream ID: 0 (easy handle 0x558fdd1c2220)
> GET /dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ HTTP/3
> Host: 1.1.1.1
> user-agent: curl/7.80.0-DEV
> accept: application/dns-message
>
< HTTP/3 200
< content-type: application/dns-message
< content-length: 44
<
{ [44 bytes data]
100    44  100    44    0     0   1305      0 --:--:-- --:--:-- --:--:--  1375
* Connection #0 to host 1.1.1.1 left intact
0000000 cdab 0081 0100 0100 0000 0000 7703 7777
0000010 7503 6362 6302 0061 0100 0100 0cc0 0100
0000020 0100 0000 3c00 0400 5bd0 3770
000002c

To configure DoH3 in local-in mode:

In the FortiProxy DNS server configuration, enable DoH3 for a port with the previously configured DNS filter profile applied:

config system dns-server
    edit "port2"
        set dnsfilter-profile "dnsfilter_fgd"
        set doh3 enable
    next
end

Test the configuration:

On the client with HTTP3 support, use q or Curl to query a FortiGuard category30 domain with the FortiProxy interface over HTTP3. The default redirect block IP address should be returned:

pc03:~# q www.mcgill.ca --http3 @https://10.1.100.150 --tls-no-verify
2023/08/18 20:37:55 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Receive-Buffer-Size for details.
www.mcgill.ca. 1m0s A 208.91.112.55
www.mcgill.ca. 1m0s AAAA 2620:101:9000:53::55

pc03:~# curl -H 'accept: application/dns-message' -v -k --http3 'https://10.1.100.150/dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ' | hexdump
*   Trying 10.1.100.150:443...
* Connect socket 5 over QUIC to 10.1.100.150:443
* Sent QUIC client Initial, ALPN: h3,h3-29,h3-28,h3-27
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Connected to 10.1.100.150 (10.1.100.150) port 443 (#0)
* h3 [:method: GET]
* h3 [:path: /dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ]
* h3 [:scheme: https]
* h3 [:authority: 10.1.100.150]
* h3 [user-agent: curl/7.80.0-DEV]
* h3 [accept: application/dns-message]
* Using HTTP/3 Stream ID: 0 (easy handle 0x55ced8274250)
> GET /dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ HTTP/3
> Host: 10.1.100.150
> user-agent: curl/7.80.0-DEV
> accept: application/dns-message
>
< HTTP/3 200
< content-type: application/dns-message
< content-length: 44
<
{ [44 bytes data]
100    44  100    44    0     0   1893      0 --:--:-- --:--:-- --:--:--  2000
* Connection #0 to host 10.1.100.150 left intact
0000000 cdab 0081 0100 0100 0000 0000 7703 7777
0000010 7503 6362 6302 0061 0100 0100 0cc0 0100
0000020 0100 0000 3c00 0400 5bd0 3770
000002c

HTTP3 deep inspection, QUIC certificate inspection, DNS over QUIC and DNS over HTTP3 for transparent and local-in DNS modes

DoQ transparent and local-in query can be achieved using tools or applications in Linux, such as the q tiny command line DNS client from Natesales.

To configure DoQ in transparent mode:

Enable QUIC in the ssl-ssh-profile:

config firewall ssl-ssh-profile
    edit "protocols"
        config dot
            set status deep-inspection
            set quic inspect
        end
    next
end

Configure a DNS filter profile:

config dnsfilter profile
    edit "dnsfilter_fgd"
        config ftgd-dns
            config filters
                edit 1
                    set category 30
                    set action block
                next
            end
        end
    next
end

Apply the profiles to a proxy firewall policy:

config firewall policy
    edit 1
        set name "dnsfilter"
        set srcintf "port2"
        set dstintf "port1"
        set action accept
        set srcaddr "all"
        set dstaddr "all"
        set schedule "always"
        set service "ALL"
        set utm-status enable
        set inspection-mode proxy
        set profile-protocol-options "protocol"
        set ssl-ssh-profile "protocols"
        set dnsfilter-profile "dnsfilter_fgd"
        set logtraffic all
        set nat enable
    next
end

Test the configuration:

On the client, use q to query a FortiGuard category30 domain with the Adguard DNS server over QUIC. The default redirect block IP address should be returned:

pc03:~# q www.sfu.ca @quic://dns.adguard.com --tls-no-verify
2023/08/18 18:53:44 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Receive-Buffer-Size for details.
www.sfu.ca. 1m0s A 208.91.112.55
www.sfu.ca. 1m0s AAAA 2620:101:9000:53::55

To configure DoQ in local-in mode:

In the FortiProxy DNS server configuration, enable DoQ for a port with the previously configured DNS filter profile applied:

config system dns-server
    edit "port2"
        set dnsfilter-profile "dnsfilter_fgd"
        set doq enable
    next
end

Test the configuration:

On the client, use q to query a FortiGuard category30 domain with the FortiProxy interface over QUIC. The default redirect block IP address should be returned:

pc03:~# q www.mcgill.ca @quic://10.1.100.150 --tls-no-verify
2023/08/18 20:05:53 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Receive-Buffer-Size for details.
www.mcgill.ca. 1m0s A 208.91.112.55
www.mcgill.ca. 1m0s AAAA 2620:101:9000:53::55

To configure DoH3 in transparent mode:

Enable QUIC in the ssl-ssh-profile:

config firewall ssl-ssh-profile
    edit "protocols"
        config https
            set ports 443 8443
            set status deep-inspection
            set quic inspect
        end
    next
end

Configure a DNS filter profile:

config dnsfilter profile
    edit "dnsfilter_fgd"
        config ftgd-dns
            config filters
                edit 1
                    set category 30
                    set action block
                next
            end
        end
    next
end

Apply the profiles to a proxy firewall policy:

config firewall policy
    edit 1
        set name "dnsfilter"
        set srcintf "port2"
        set dstintf "port1"
        set action accept
        set srcaddr "all"
        set dstaddr "all"
        set schedule "always"
        set service "ALL"
        set utm-status enable
        set inspection-mode proxy
        set profile-protocol-options "protocol"
        set ssl-ssh-profile "protocols"
        set dnsfilter-profile "dnsfilter_fgd"
        set logtraffic all
        set nat enable
    next
end

Test the configuration:

pc03:~# q www.mcgill.ca --http3 @https://dns.adguard.com --tls-no-verify
2023/08/18 21:04:02 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Receive-Buffer-Size for details.
www.mcgill.ca. 1m0s A 208.91.112.55
www.mcgill.ca. 1m0s AAAA 2620:101:9000:53::55

pc03:~# curl -H 'accept: application/dns-message' -v -k --http3 'https://1.1.1.1/dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ' | hexdump
*   Trying 1.1.1.1:443...
* Connect socket 5 over QUIC to 1.1.1.1:443
* Sent QUIC client Initial, ALPN: h3,h3-29,h3-28,h3-27
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Connected to 1.1.1.1 (1.1.1.1) port 443 (#0)
* h3 [:method: GET]
* h3 [:path: /dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ]
* h3 [:scheme: https]
* h3 [:authority: 1.1.1.1]
* h3 [user-agent: curl/7.80.0-DEV]
* h3 [accept: application/dns-message]
* Using HTTP/3 Stream ID: 0 (easy handle 0x558fdd1c2220)
> GET /dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ HTTP/3
> Host: 1.1.1.1
> user-agent: curl/7.80.0-DEV
> accept: application/dns-message
>
< HTTP/3 200
< content-type: application/dns-message
< content-length: 44
<
{ [44 bytes data]
100    44  100    44    0     0   1305      0 --:--:-- --:--:-- --:--:--  1375
* Connection #0 to host 1.1.1.1 left intact
0000000 cdab 0081 0100 0100 0000 0000 7703 7777
0000010 7503 6362 6302 0061 0100 0100 0cc0 0100
0000020 0100 0000 3c00 0400 5bd0 3770
000002c

To configure DoH3 in local-in mode:

In the FortiProxy DNS server configuration, enable DoH3 for a port with the previously configured DNS filter profile applied:

config system dns-server
    edit "port2"
        set dnsfilter-profile "dnsfilter_fgd"
        set doh3 enable
    next
end

Test the configuration:

On the client with HTTP3 support, use q or Curl to query a FortiGuard category30 domain with the FortiProxy interface over HTTP3. The default redirect block IP address should be returned:

pc03:~# q www.mcgill.ca --http3 @https://10.1.100.150 --tls-no-verify
2023/08/18 20:37:55 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Receive-Buffer-Size for details.
www.mcgill.ca. 1m0s A 208.91.112.55
www.mcgill.ca. 1m0s AAAA 2620:101:9000:53::55

pc03:~# curl -H 'accept: application/dns-message' -v -k --http3 'https://10.1.100.150/dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ' | hexdump
*   Trying 10.1.100.150:443...
* Connect socket 5 over QUIC to 10.1.100.150:443
* Sent QUIC client Initial, ALPN: h3,h3-29,h3-28,h3-27
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Connected to 10.1.100.150 (10.1.100.150) port 443 (#0)
* h3 [:method: GET]
* h3 [:path: /dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ]
* h3 [:scheme: https]
* h3 [:authority: 10.1.100.150]
* h3 [user-agent: curl/7.80.0-DEV]
* h3 [accept: application/dns-message]
* Using HTTP/3 Stream ID: 0 (easy handle 0x55ced8274250)
> GET /dns-query?dns=q80BAAABAAAAAAAAA3d3dwN1YmMCY2EAAAEAAQ HTTP/3
> Host: 10.1.100.150
> user-agent: curl/7.80.0-DEV
> accept: application/dns-message
>
< HTTP/3 200
< content-type: application/dns-message
< content-length: 44
<
{ [44 bytes data]
100    44  100    44    0     0   1893      0 --:--:-- --:--:-- --:--:--  2000
* Connection #0 to host 10.1.100.150 left intact
0000000 cdab 0081 0100 0100 0000 0000 7703 7777
0000010 7503 6362 6302 0061 0100 0100 0cc0 0100
0000020 0100 0000 3c00 0400 5bd0 3770
000002c

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HTTP3 deep inspection, QUIC certificate inspection, DNS over QUIC and DNS over HTTP3 for transparent and local-in DNS modes

HTTP3 deep inspection, QUIC certificate inspection, DNS over QUIC and DNS over HTTP3 for transparent and local-in DNS modes

To configure DoQ in transparent mode:

To configure DoQ in local-in mode:

To configure DoH3 in transparent mode:

To configure DoH3 in local-in mode:

HTTP3 deep inspection, QUIC certificate inspection, DNS over QUIC and DNS over HTTP3 for transparent and local-in DNS modes

HTTP3 deep inspection, QUIC certificate inspection, DNS over QUIC and DNS over HTTP3 for transparent and local-in DNS modes

To configure DoQ in transparent mode:

To configure DoQ in local-in mode:

To configure DoH3 in transparent mode:

To configure DoH3 in local-in mode: