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# $Id: radius.py 23 2006-11-08 15:45:33Z dugsong $

"""Remote Authentication Dial-In User Service."""

import dpkt

# http://www.untruth.org/~josh/security/radius/radius-auth.html
# RFC 2865

class RADIUS(dpkt.Packet):
    __hdr__ = (
        ('code', 'B', 0),
        ('id', 'B', 0),
        ('len', 'H', 4),
        ('auth', '16s', '')
        )
    attrs = ''
    def unpack(self, buf):
        dpkt.Packet.unpack(self, buf)
        self.attrs = parse_attrs(self.data)
        self.data = ''

def parse_attrs(buf):
    """Parse attributes buffer into a list of (type, data) tuples."""
    attrs = []
    while buf:
        t = ord(buf[0])
        l = ord(buf[1])
        if l < 2:
            break
        d, buf = buf[2:l], buf[l:]
        attrs.append((t, d))
    return attrs

# Codes
RADIUS_ACCESS_REQUEST	= 1
RADIUS_ACCESS_ACCEPT	= 2
RADIUS_ACCESS_REJECT	= 3
RADIUS_ACCT_REQUEST	= 4
RADIUS_ACCT_RESPONSE	= 5
RADIUS_ACCT_STATUS	= 6
RADIUS_ACCESS_CHALLENGE	= 11

# Attributes
RADIUS_USER_NAME		= 1
RADIUS_USER_PASSWORD		= 2
RADIUS_CHAP_PASSWORD		= 3
RADIUS_NAS_IP_ADDR      	= 4
RADIUS_NAS_PORT			= 5
RADIUS_SERVICE_TYPE		= 6
RADIUS_FRAMED_PROTOCOL		= 7
RADIUS_FRAMED_IP_ADDR		= 8
RADIUS_FRAMED_IP_NETMASK	= 9
RADIUS_FRAMED_ROUTING		= 10
RADIUS_FILTER_ID		= 11
RADIUS_FRAMED_MTU		= 12
RADIUS_FRAMED_COMPRESSION	= 13
RADIUS_LOGIN_IP_HOST		= 14
RADIUS_LOGIN_SERVICE		= 15
RADIUS_LOGIN_TCP_PORT		= 16
# unassigned
RADIUS_REPLY_MESSAGE		= 18
RADIUS_CALLBACK_NUMBER		= 19
RADIUS_CALLBACK_ID		= 20
# unassigned
RADIUS_FRAMED_ROUTE		= 22
RADIUS_FRAMED_IPX_NETWORK	= 23
RADIUS_STATE			= 24
RADIUS_CLASS			= 25
RADIUS_VENDOR_SPECIFIC		= 26
RADIUS_SESSION_TIMEOUT		= 27
RADIUS_IDLE_TIMEOUT		= 28
RADIUS_TERMINATION_ACTION	= 29
RADIUS_CALLED_STATION_ID	= 30
RADIUS_CALLING_STATION_ID	= 31
RADIUS_NAS_ID			= 32
RADIUS_PROXY_STATE		= 33
RADIUS_LOGIN_LAT_SERVICE	= 34
RADIUS_LOGIN_LAT_NODE		= 35
RADIUS_LOGIN_LAT_GROUP		= 36
RADIUS_FRAMED_ATALK_LINK	= 37
RADIUS_FRAMED_ATALK_NETWORK	= 38
RADIUS_FRAMED_ATALK_ZONE	= 39
# 40-59 reserved for accounting
RADIUS_CHAP_CHALLENGE		= 60
RADIUS_NAS_PORT_TYPE		= 61
RADIUS_PORT_LIMIT		= 62
RADIUS_LOGIN_LAT_PORT		= 63