opensnitch/daemon/system-fw.json

{
  "Enabled": true,
  "Version": 1,
  "SystemRules": [
    {
      "Rule": {
        "Table": "mangle",
        "Chain": "OUTPUT",
        "Enabled": false,
        "Position": "0",
        "Description": "Allow icmp",
        "Parameters": "-p icmp",
        "Expressions": [],
        "Target": "ACCEPT",
        "TargetParameters": ""
      },
      "Chains": []
    },
    {
      "Chains": [
        {
          "Name": "forward",
          "Table": "filter",
          "Family": "inet",
          "Priority": "",
          "Type": "filter",
          "Hook": "forward",
          "Policy": "accept",
          "Rules": []
        },
        {
          "Name": "output",
          "Table": "filter",
          "Family": "inet",
          "Priority": "",
          "Type": "filter",
          "Hook": "output",
          "Policy": "accept",
          "Rules": []
        },
        {
          "Name": "input",
          "Table": "filter",
          "Family": "inet",
          "Priority": "",
          "Type": "filter",
          "Hook": "input",
          "Policy": "accept",
          "Rules": [
            {
              "Enabled": false,
              "Position": "0",
              "Description": "Allow SSH server connections when input policy is DROP",
              "Parameters": "",
              "Expressions": [
                {
                  "Statement": {
                    "Op": "",
                    "Name": "tcp",
                    "Values": [
                      {
                        "Key": "dport",
                        "Value": "22"
                      }
                    ]
                  }
                }
              ],
              "Target": "accept",
              "TargetParameters": ""
            } 
          ]
        },
        {
          "Name": "filter-prerouting",
          "Table": "nat",
          "Family": "inet",
          "Priority": "",
          "Type": "filter",
          "Hook": "prerouting",
          "Policy": "accept",
          "Rules": []
        },
        {
          "Name": "prerouting",
          "Table": "mangle",
          "Family": "inet",
          "Priority": "",
          "Type": "mangle",
          "Hook": "prerouting",
          "Policy": "accept",
          "Rules": []
        },
        {
          "Name": "postrouting",
          "Table": "mangle",
          "Family": "inet",
          "Priority": "",
          "Type": "mangle",
          "Hook": "postrouting",
          "Policy": "accept",
          "Rules": []
        },
        {
          "Name": "prerouting",
          "Table": "nat",
          "Family": "inet",
          "Priority": "",
          "Type": "natdest",
          "Hook": "prerouting",
          "Policy": "accept",
          "Rules": []
        },
        {
          "Name": "postrouting",
          "Table": "nat",
          "Family": "inet",
          "Priority": "",
          "Type": "natsource",
          "Hook": "postrouting",
          "Policy": "accept",
          "Rules": []
        },
        {
          "Name": "input",
          "Table": "nat",
          "Family": "inet",
          "Priority": "",
          "Type": "natsource",
          "Hook": "input",
          "Policy": "accept",
          "Rules": []
        },
        {
          "Name": "output",
          "Table": "nat",
          "Family": "inet",
          "Priority": "",
          "Type": "natdest",
          "Hook": "output",
          "Policy": "accept",
          "Rules": []
        },
        {
          "Name": "output",
          "Table": "mangle",
          "Family": "inet",
          "Priority": "",
          "Type": "mangle",
          "Hook": "output",
          "Policy": "accept",
          "Rules": [
            {
              "Enabled": true,
              "Position": "0",
              "Description": "Allow ICMP",
              "Expressions": [
                {
                  "Statement": {
                    "Op": "",
                    "Name": "icmp",
                    "Values": [
                      {
                        "Key": "type",
                        "Value": "echo-request,echo-reply,destination-unreachable"
                      }
                    ]
                  }
                }
              ],
              "Target": "accept",
              "TargetParameters": ""
            },
            {
              "Enabled": true,
              "Position": "0",
              "Description": "Allow ICMPv6",
              "Expressions": [
                {
                  "Statement": {
                    "Op": "",
                    "Name": "icmpv6",
                    "Values": [
                      {
                        "Key": "type",
                        "Value": "echo-request,echo-reply,destination-unreachable"
                      }
                    ]
                  }
                }
              ],
              "Target": "accept",
              "TargetParameters": ""
            },
            {
              "Enabled": false,
              "Position": "0",
              "Description": "Exclude WireGuard VPN from being intercepted",
              "Parameters": "",
              "Expressions": [
                {
                  "Statement": {
                    "Op": "",
                    "Name": "udp",
                    "Values": [
                      {
                        "Key": "dport",
                        "Value": "51820"
                      }
                    ]
                  }
                }
              ],
              "Target": "accept",
              "TargetParameters": ""
            }
          ]
        },
        {
          "Name": "forward",
          "Table": "mangle",
          "Family": "inet",
          "Priority": "",
          "Type": "mangle",
          "Hook": "forward",
          "Policy": "accept",
          "Rules": [
            {
              "UUID": "7d7394e1-100d-4b87-a90a-cd68c46edb0b",
              "Enabled": false,
              "Position": "0",
              "Description": "Intercept forwarded connections (docker, etc)",
              "Expressions": [
                {
                  "Statement": {
                    "Op": "",
                    "Name": "ct",
                    "Values": [
                      {
                        "Key": "state",
                        "Value": "new"
                      }
                    ]
                  }
                }
              ],
              "Target": "queue",
              "TargetParameters": "num 0"
            }
          ]
        }
      ]
    }
  ]
}