\section{API} \label{api}

Managing the firewall rules can be done over a rest api. Available routes are following and can be retrieved by visiting the API (e.g. \verb|https://10.93.0.224:8080/api|) of the device.

\lstset{style=json}
\begin{lstlisting}
[
    {
        "endpoint": "https://10.93.0.224:8080/api/firewall/rules",
        "description": "Get all Firewall Rules",
        "method": "GET"
    },
    {
        "endpoint": "https://10.93.0.224:8080/api/firewall/rules/<key>",
        "description": "Get Firewall Rule by key",
        "method": "GET"
    },
    {
        "endpoint": "https://10.93.0.224:8080/api/firewall/rules",
        "description": "Create Firewall Rule",
        "method": "POST"
    },
    {
        "endpoint": "https://10.93.0.224:8080/api/firewall/rules/<key>",
        "description": "Delete Firewall Rule by key",
        "method": "DELETE"
    }
]
\end{lstlisting}

\subsection{Create firewall rule}

To create a firewall rule with a POST request, query parameter for each field are required:

\verb|?ip=10.93.0.211&port_from=22&port_to=80&protocol=TCP&target=REJECT|

The response will be the created rule with its parameter.

\lstset{style=json}
\begin{lstlisting}
    {
        "key": "1",
        "ip": "10.93.0.211",
        "port_from": "22",
        "port_to": "80",
        "protocol": "TCP",
        "target": "REJECT"
    }
\end{lstlisting}

Available protocols are \verb|TCP, UDP & ALL|

Available targets are \verb|REJECT, ACCEPT & DROP|

\newpage

\subsection{Authentication}

To authenticate the API uses basic auth. Communication is therefor encrypted to protect the process from eavesdropping. Setting the username and password is done via the constructor of the api class. To create the api class to setup the firewall rules a firewall class instance is needed.

\lstset{style=c++}
\begin{lstlisting}
    #include "Firewall.hpp"
    #include "API.hpp"

    firewall = new fw::Firewall();
    firewallApi = new fw::API(firewall, cert, key, username, password);
\end{lstlisting}

After this all endpoints shown in section \ref{api} will be protected.