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Client

Client

Bases: Host

Basic RADIUS client. This class implements a basic RADIUS client. It can send requests to a RADIUS server, taking care of timeouts and retries, and validate its replies.

Source code in pyrad2/client.py 
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class Client(host.Host):
    """Basic RADIUS client.
    This class implements a basic RADIUS client. It can send requests
    to a RADIUS server, taking care of timeouts and retries, and
    validate its replies.
    """

    def __init__(
        self,
        server: str,
        authport: int = 1812,
        acctport: int = 1813,
        coaport: int = 3799,
        secret: bytes = b"",
        dict: Optional[Dictionary] = None,
        retries: int = 3,
        timeout: int = 5,
    ):
        """Initializes a RADIUS client.

        Args:
            server (str): Hostname or IP address of the RADIUS server.
            authport (int): Port to use for authentication packets.
            acctport (int): Port to use for accounting packets.
            coaport (int): Port to use for CoA packets.
            secret (bytes): RADIUS secret.
            dict (pyrad.dictionary.Dictionary): RADIUS dictionary.
            retries (int): Number of times to retry sending a RADIUS request.
            timeout (int): Number of seconds to wait for an answer.
        """
        super().__init__(authport, acctport, coaport, dict)

        self.server = server
        self.secret = secret
        self.retries = retries
        self.timeout = timeout
        self._poll = select.poll()
        self._socket: Optional[socket.socket] = None

    def bind(self, addr: str | tuple) -> None:
        """Bind socket to an address.
        Binding the socket used for communicating to an address can be
        usefull when working on a machine with multiple addresses.

        Args:
            addr (str | tuple): network address (hostname or IP) and port to bind to
        """
        self._CloseSocket()
        self._SocketOpen()
        if self._socket:
            self._socket.bind(addr)
        else:
            raise RuntimeError("No socket present")

    def _SocketOpen(self) -> None:
        try:
            family = socket.getaddrinfo(self.server, 80)[0][0]
        except Exception:
            family = socket.AF_INET
        if not self._socket:
            self._socket = socket.socket(family, socket.SOCK_DGRAM)
            self._socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            self._poll.register(self._socket, select.POLLIN)

    def _CloseSocket(self) -> None:
        if self._socket:
            self._poll.unregister(self._socket)
            self._socket.close()
            self._socket = None

    def CreateAuthPacket(self, **args) -> packet.Packet:
        """Create a new RADIUS packet.
        This utility function creates a new RADIUS packet which can
        be used to communicate with the RADIUS server this client
        talks to. This is initializing the new packet with the
        dictionary and secret used for the client.

        Returns:
            packet.Packet: A new empty packet instance
        """
        return super().CreateAuthPacket(secret=self.secret, **args)

    def CreateAcctPacket(self, **args) -> packet.Packet:
        """Create a new RADIUS packet.
        This utility function creates a new RADIUS packet which can
        be used to communicate with the RADIUS server this client
        talks to. This is initializing the new packet with the
        dictionary and secret used for the client.

        Returns:
            packet.Packet: A new empty packet instance
        """
        return super().CreateAcctPacket(secret=self.secret, **args)

    def CreateCoAPacket(self, **args) -> packet.Packet:
        """Create a new RADIUS packet.
        This utility function creates a new RADIUS packet which can
        be used to communicate with the RADIUS server this client
        talks to. This is initializing the new packet with the
        dictionary and secret used for the client.

        Returns:
            packet.Packet: A new empty packet instance
        """
        return super().CreateCoAPacket(secret=self.secret, **args)

    def _SendPacket(self, pkt: packet.PacketImplementation, port: int):
        """Send a packet to a RADIUS server.

        Args:
            pkt (packet.Packet): The packet to send
            port (int): UDP port to send packet to

        Returns:
            packet.Packet: The reply packet received

        Raises:
            Timeout: RADIUS server does not reply
        """
        self._SocketOpen()

        for attempt in range(self.retries):
            if attempt and pkt.code == PacketType.AccountingRequest:
                if "Acct-Delay-Time" in pkt:
                    pkt["Acct-Delay-Time"] = pkt["Acct-Delay-Time"][0] + self.timeout
                else:
                    pkt["Acct-Delay-Time"] = self.timeout

            now = time.time()
            waitto = now + self.timeout

            if not self._socket:
                raise RuntimeError("No socket present")

            self._socket.sendto(pkt.RequestPacket(), (self.server, port))

            while now < waitto:
                ready = self._poll.poll((waitto - now) * 1000)

                if ready:
                    rawreply = self._socket.recv(4096)
                else:
                    now = time.time()
                    continue

                try:
                    reply = pkt.CreateReply(packet=rawreply)
                    if pkt.VerifyReply(reply, rawreply):
                        return reply
                except packet.PacketError:
                    pass

                now = time.time()

        raise Timeout

    def SendPacket(self, pkt: packet.PacketImplementation) -> packet.Packet:  # type: ignore
        """Send a packet to a RADIUS server.

        Args:
            pkt (packet.Packet): Packet to send

        Returns:
            packet.Packet: The reply packet received

        Raises:
            Timeout: RADIUS server does not reply
        """
        if isinstance(pkt, packet.AuthPacket):
            if pkt.auth_type == "eap-md5":
                # Creating EAP-Identity
                password = pkt[2][0] if 2 in pkt else pkt[1][0]
                pkt[79] = [
                    struct.pack(
                        "!BBHB%ds" % len(password),
                        EAPPacketType.RESPONSE,
                        packet.CurrentID,
                        len(password) + 5,
                        EAPType.IDENTITY,
                        password,
                    )
                ]
            reply = self._SendPacket(pkt, self.authport)
            if (
                reply
                and reply.code == PacketType.AccessChallenge
                and pkt.auth_type == "eap-md5"
            ):
                # Got an Access-Challenge
                eap_code, eap_id, eap_size, eap_type, eap_md5 = struct.unpack(
                    "!BBHB%ds" % (len(reply[79][0]) - 5), reply[79][0]
                )
                # Sending back an EAP-Type-MD5-Challenge
                # Thank god for http://www.secdev.org/python/eapy.py
                client_pw = pkt[2][0] if 2 in pkt else pkt[1][0]
                md5_challenge = hashlib.md5(
                    struct.pack("!B", eap_id) + client_pw + eap_md5[1:]
                ).digest()
                pkt[79] = [
                    struct.pack(
                        "!BBHBB",
                        2,
                        eap_id,
                        len(md5_challenge) + 6,
                        4,
                        len(md5_challenge),
                    )
                    + md5_challenge
                ]
                # Copy over Challenge-State
                pkt[24] = reply[24]
                reply = self._SendPacket(pkt, self.authport)
            return reply
        elif isinstance(pkt, packet.CoAPacket):
            return self._SendPacket(pkt, self.coaport)
        else:
            return self._SendPacket(pkt, self.acctport)

__init__(server, authport=1812, acctport=1813, coaport=3799, secret=b'', dict=None, retries=3, timeout=5)

Initializes a RADIUS client.

Parameters:

Name Type Description Default
server str

Hostname or IP address of the RADIUS server.

 required
authport int

Port to use for authentication packets.

 1812
acctport int

Port to use for accounting packets.

 1813
coaport int

Port to use for CoA packets.

 3799
secret bytes

RADIUS secret.

 b''
dict Dictionary

RADIUS dictionary.

 None
retries int

Number of times to retry sending a RADIUS request.

 3
timeout int

Number of seconds to wait for an answer.

 5
Source code in pyrad2/client.py 
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def __init__(
    self,
    server: str,
    authport: int = 1812,
    acctport: int = 1813,
    coaport: int = 3799,
    secret: bytes = b"",
    dict: Optional[Dictionary] = None,
    retries: int = 3,
    timeout: int = 5,
):
    """Initializes a RADIUS client.

    Args:
        server (str): Hostname or IP address of the RADIUS server.
        authport (int): Port to use for authentication packets.
        acctport (int): Port to use for accounting packets.
        coaport (int): Port to use for CoA packets.
        secret (bytes): RADIUS secret.
        dict (pyrad.dictionary.Dictionary): RADIUS dictionary.
        retries (int): Number of times to retry sending a RADIUS request.
        timeout (int): Number of seconds to wait for an answer.
    """
    super().__init__(authport, acctport, coaport, dict)

    self.server = server
    self.secret = secret
    self.retries = retries
    self.timeout = timeout
    self._poll = select.poll()
    self._socket: Optional[socket.socket] = None

bind(addr)

Bind socket to an address. Binding the socket used for communicating to an address can be usefull when working on a machine with multiple addresses.

Parameters:

Name Type Description Default
addr str | tuple

network address (hostname or IP) and port to bind to

 required
Source code in pyrad2/client.py 
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def bind(self, addr: str | tuple) -> None:
    """Bind socket to an address.
    Binding the socket used for communicating to an address can be
    usefull when working on a machine with multiple addresses.

    Args:
        addr (str | tuple): network address (hostname or IP) and port to bind to
    """
    self._CloseSocket()
    self._SocketOpen()
    if self._socket:
        self._socket.bind(addr)
    else:
        raise RuntimeError("No socket present")

CreateAuthPacket(**args)

Create a new RADIUS packet. This utility function creates a new RADIUS packet which can be used to communicate with the RADIUS server this client talks to. This is initializing the new packet with the dictionary and secret used for the client.

Returns:

Type Description
Packet

packet.Packet: A new empty packet instance
Source code in pyrad2/client.py 
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def CreateAuthPacket(self, **args) -> packet.Packet:
    """Create a new RADIUS packet.
    This utility function creates a new RADIUS packet which can
    be used to communicate with the RADIUS server this client
    talks to. This is initializing the new packet with the
    dictionary and secret used for the client.

    Returns:
        packet.Packet: A new empty packet instance
    """
    return super().CreateAuthPacket(secret=self.secret, **args)

CreateAcctPacket(**args)

Create a new RADIUS packet. This utility function creates a new RADIUS packet which can be used to communicate with the RADIUS server this client talks to. This is initializing the new packet with the dictionary and secret used for the client.

Returns:

Type Description
Packet

packet.Packet: A new empty packet instance
Source code in pyrad2/client.py 
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def CreateAcctPacket(self, **args) -> packet.Packet:
    """Create a new RADIUS packet.
    This utility function creates a new RADIUS packet which can
    be used to communicate with the RADIUS server this client
    talks to. This is initializing the new packet with the
    dictionary and secret used for the client.

    Returns:
        packet.Packet: A new empty packet instance
    """
    return super().CreateAcctPacket(secret=self.secret, **args)

CreateCoAPacket(**args)

Create a new RADIUS packet. This utility function creates a new RADIUS packet which can be used to communicate with the RADIUS server this client talks to. This is initializing the new packet with the dictionary and secret used for the client.

Returns:

Type Description
Packet

packet.Packet: A new empty packet instance
Source code in pyrad2/client.py 
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def CreateCoAPacket(self, **args) -> packet.Packet:
    """Create a new RADIUS packet.
    This utility function creates a new RADIUS packet which can
    be used to communicate with the RADIUS server this client
    talks to. This is initializing the new packet with the
    dictionary and secret used for the client.

    Returns:
        packet.Packet: A new empty packet instance
    """
    return super().CreateCoAPacket(secret=self.secret, **args)

SendPacket(pkt)

Send a packet to a RADIUS server.

Parameters:

Name Type Description Default
pkt Packet

Packet to send

 required

Returns:

Type Description
Packet

packet.Packet: The reply packet received

Raises:

Type Description
Timeout

RADIUS server does not reply
Source code in pyrad2/client.py 
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def SendPacket(self, pkt: packet.PacketImplementation) -> packet.Packet:  # type: ignore
    """Send a packet to a RADIUS server.

    Args:
        pkt (packet.Packet): Packet to send

    Returns:
        packet.Packet: The reply packet received

    Raises:
        Timeout: RADIUS server does not reply
    """
    if isinstance(pkt, packet.AuthPacket):
        if pkt.auth_type == "eap-md5":
            # Creating EAP-Identity
            password = pkt[2][0] if 2 in pkt else pkt[1][0]
            pkt[79] = [
                struct.pack(
                    "!BBHB%ds" % len(password),
                    EAPPacketType.RESPONSE,
                    packet.CurrentID,
                    len(password) + 5,
                    EAPType.IDENTITY,
                    password,
                )
            ]
        reply = self._SendPacket(pkt, self.authport)
        if (
            reply
            and reply.code == PacketType.AccessChallenge
            and pkt.auth_type == "eap-md5"
        ):
            # Got an Access-Challenge
            eap_code, eap_id, eap_size, eap_type, eap_md5 = struct.unpack(
                "!BBHB%ds" % (len(reply[79][0]) - 5), reply[79][0]
            )
            # Sending back an EAP-Type-MD5-Challenge
            # Thank god for http://www.secdev.org/python/eapy.py
            client_pw = pkt[2][0] if 2 in pkt else pkt[1][0]
            md5_challenge = hashlib.md5(
                struct.pack("!B", eap_id) + client_pw + eap_md5[1:]
            ).digest()
            pkt[79] = [
                struct.pack(
                    "!BBHBB",
                    2,
                    eap_id,
                    len(md5_challenge) + 6,
                    4,
                    len(md5_challenge),
                )
                + md5_challenge
            ]
            # Copy over Challenge-State
            pkt[24] = reply[24]
            reply = self._SendPacket(pkt, self.authport)
        return reply
    elif isinstance(pkt, packet.CoAPacket):
        return self._SendPacket(pkt, self.coaport)
    else:
        return self._SendPacket(pkt, self.acctport)