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/*
* radius.c
*
* Copyright (C) 2012-21 - ntop.org
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_RADIUS
#include "ndpi_api.h"
#define RADIUS_PORT 1812
#define RADIUS_PORT_ACC 1813
#define RADIUS_PORT_ACC_ALTERNATIVE 18013
struct radius_header {
u_int8_t code;
u_int8_t packet_id;
u_int16_t len;
};
static void ndpi_check_radius(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
// const u_int8_t *packet_payload = packet->payload;
u_int32_t payload_len = packet->payload_packet_len;
if(packet->udp != NULL &&
(packet->udp->dest == htons(RADIUS_PORT) || packet->udp->source == htons(RADIUS_PORT) ||
packet->udp->dest == htons(RADIUS_PORT_ACC) || packet->udp->source == htons(RADIUS_PORT_ACC) ||
packet->udp->dest == htons(RADIUS_PORT_ACC_ALTERNATIVE) || packet->udp->source == htons(RADIUS_PORT_ACC_ALTERNATIVE))) {
struct radius_header *h = (struct radius_header*)packet->payload;
/* RFC2865: The minimum length is 20 and maximum length is 4096. */
if((payload_len < 20) || (payload_len > 4096)) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if((h->code > 0)
&& (h->code <= 13)
&& (ntohs(h->len) == payload_len)) {
NDPI_LOG_INFO(ndpi_struct, "Found radius\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_RADIUS, NDPI_PROTOCOL_UNKNOWN);
return;
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
}
void ndpi_search_radius(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
NDPI_LOG_DBG(ndpi_struct, "search radius\n");
/* skip marked packets */
if(flow->detected_protocol_stack[0] != NDPI_PROTOCOL_RADIUS)
ndpi_check_radius(ndpi_struct, flow);
}
void init_radius_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("Radius", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_RADIUS,
ndpi_search_radius,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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