1 files changed, 86 insertions, 0 deletions
diff --git a/src/lib/protocols/radius_proto.c b/src/lib/protocols/radius_proto.c
new file mode 100644
index 000000000..00bbcad04
--- /dev/null
+++ b/src/lib/protocols/radius_proto.c
@@ -0,0 +1,86 @@
+/*
+ * radius_proto.c
+ *
+ * Copyright (C) 2012-24 - 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"
+#include "ndpi_private.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->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, NDPI_CONFIDENCE_DPI);
+      return;
+    }
+  }
+  if(flow->packet_counter > 3)
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+  return;
+}
+
+static void ndpi_search_radius(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  NDPI_LOG_DBG(ndpi_struct, "search radius\n");
+
+  ndpi_check_radius(ndpi_struct, flow);
+}
+
+
+void init_radius_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("Radius", ndpi_struct, *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;
+}