Initial import from SVN

1 files changed, 368 insertions, 0 deletions

diff --git a/src/lib/protocols/netbios.c b/src/lib/protocols/netbios.c
new file mode 100644
index 000000000..41f13b0f6
--- /dev/null
+++ b/src/lib/protocols/netbios.c
@@ -0,0 +1,368 @@
+/*
+ * netbios.c
+ *
+ * Copyright (C) 2009-2011 by ipoque GmbH
+ * Copyright (C) 2011-15 - ntop.org
+ *
+ * This file is part of nDPI, an open source deep packet inspection
+ * library based on the OpenDPI and PACE technology by ipoque GmbH
+ *
+ * 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_protocols.h"
+
+#ifdef NDPI_PROTOCOL_NETBIOS
+
+/* The function below has been inherited by tcpdump */
+static int netbios_name_interpret(char *in, char *out, u_int out_len) {
+  int ret, len;
+  char *b;
+  
+  len = (*in++)/2;
+  b  = out;
+  *out=0;
+
+  if(len > (out_len-1) || len < 1)
+    return(-1);  
+  
+  while (len--) {
+    if(in[0] < 'A' || in[0] > 'P' || in[1] < 'A' || in[1] > 'P') {
+      *out = 0;
+      return(-1);
+    }
+
+    *out = ((in[0]-'A')<<4) + (in[1]-'A');
+    in += 2;
+    out++;
+  }
+  ret = *(--out);
+  *out = 0;
+
+  /* Courtesy of Roberto F. De Luca <deluca@tandar.cnea.gov.ar> */
+  /* Trim trailing whitespace from the returned string */
+  for(out--; out>=b && *out==' '; out--) *out = '\0';
+
+  return(ret);
+}
+
+
+static void ndpi_int_netbios_add_connection(struct ndpi_detection_module_struct
+					    *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_NETBIOS, NDPI_REAL_PROTOCOL);
+}
+
+
+void ndpi_search_netbios(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+	
+  //      struct ndpi_id_struct         *src=ndpi_struct->src;
+  //      struct ndpi_id_struct         *dst=ndpi_struct->dst;
+
+
+  u_int16_t dport;
+
+  if (packet->udp != NULL) {
+    dport = ntohs(packet->udp->dest);
+
+    NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG, "netbios udp start\n");
+
+    /*check standard NETBIOS over udp to port 137  */
+    if ((dport == 137 || 0) && packet->payload_packet_len >= 50) {
+
+      NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+	       NDPI_LOG_DEBUG, "found netbios port 137 and payload_packet_len 50\n");
+
+      if (ntohs(get_u_int16_t(packet->payload, 2)) == 0 &&
+	  ntohs(get_u_int16_t(packet->payload, 4)) == 1 &&
+	  ntohs(get_u_int16_t(packet->payload, 6)) == 0 &&
+	  ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 0) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		 NDPI_LOG_DEBUG, "found netbios with questions = 1 and answers = 0, authority = 0  \n");
+
+	ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	return;
+      }
+      if (packet->payload[2] == 0x80 &&
+	  ntohs(get_u_int16_t(packet->payload, 4)) == 1 &&
+	  ntohs(get_u_int16_t(packet->payload, 6)) == 0 &&
+	  ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 1) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		 NDPI_LOG_DEBUG, "found netbios with questions = 1 and answers, authority, additional = 0  \n");
+
+	ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	return;
+      }
+      if (ntohs(get_u_int16_t(packet->payload, 2)) == 0x4000 &&
+	  ntohs(get_u_int16_t(packet->payload, 4)) == 1 &&
+	  ntohs(get_u_int16_t(packet->payload, 6)) == 0 &&
+	  ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 1) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		 NDPI_LOG_DEBUG, "found netbios with questions = 1 and answers = 0, authority = 0  \n");
+
+	ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	return;
+      }
+      if (ntohs(get_u_int16_t(packet->payload, 2)) == 0x8400 &&
+	  ntohs(get_u_int16_t(packet->payload, 4)) == 0 &&
+	  ntohs(get_u_int16_t(packet->payload, 6)) == 1 &&
+	  ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 0) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		 NDPI_LOG_DEBUG,
+		 "found netbios with flag 8400 questions = 0 and answers = 1, authority, additional = 0  \n");
+
+	ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	return;
+      }
+      if (ntohs(get_u_int16_t(packet->payload, 2)) == 0x8500 &&
+	  ntohs(get_u_int16_t(packet->payload, 4)) == 0 &&
+	  ntohs(get_u_int16_t(packet->payload, 6)) == 1 &&
+	  ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 0) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		 NDPI_LOG_DEBUG,
+		 "found netbios with flag 8500 questions = 0 and answers = 1, authority, additional = 0  \n");
+
+	ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	return;
+      }
+      if (ntohs(get_u_int16_t(packet->payload, 2)) == 0x2910 &&
+	  ntohs(get_u_int16_t(packet->payload, 4)) == 1 &&
+	  ntohs(get_u_int16_t(packet->payload, 6)) == 0 &&
+	  ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 1) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		 NDPI_LOG_DEBUG,
+		 "found netbios with flag 2910, questions = 1 and answers, authority=0, additional = 1  \n");
+
+	ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	return;
+      }
+      if (ntohs(get_u_int16_t(packet->payload, 2)) == 0xAD86 &&
+	  ntohs(get_u_int16_t(packet->payload, 4)) == 0 &&
+	  ntohs(get_u_int16_t(packet->payload, 6)) == 1 &&
+	  ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 0) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		 NDPI_LOG_DEBUG,
+		 "found netbios with flag ad86 questions = 0 and answers = 1, authority, additional = 0  \n");
+
+	ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	return;
+      }
+      if (ntohs(get_u_int16_t(packet->payload, 2)) == 0x0110 &&
+	  ntohs(get_u_int16_t(packet->payload, 4)) == 1 &&
+	  ntohs(get_u_int16_t(packet->payload, 6)) == 0 &&
+	  ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 0) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		 NDPI_LOG_DEBUG,
+		 "found netbios with flag 0110 questions = 1 and answers = 0, authority, additional = 0  \n");
+
+	ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	return;
+      }
+
+      if ((ntohs(get_u_int16_t(packet->payload, 2)) & 0xf800) == 0) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG, "possible netbios name query request\n");
+
+	if (get_u_int16_t(packet->payload, 4) == htons(1) &&
+	    get_u_int16_t(packet->payload, 6) == 0 &&
+	    get_u_int16_t(packet->payload, 8) == 0 && get_u_int16_t(packet->payload, 10) == 0) {
+
+	  /* name is encoded as described in rfc883 */
+	  u_int8_t name_length = packet->payload[12];
+
+	  NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		   "possible netbios name query request, one question\n");
+
+	  if (packet->payload_packet_len == 12 + 1 + name_length + 1 + 2 + 2) {
+
+	    NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		     "possible netbios name query request, length matches\n");
+
+	    /* null terminated? */
+	    if (packet->payload[12 + name_length + 1] == 0 &&
+		get_u_int16_t(packet->payload, 12 + name_length + 2) == htons(0x0020) &&
+		get_u_int16_t(packet->payload, 12 + name_length + 4) == htons(0x0001)) {
+
+	      NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		       "found netbios name query request\n");
+	      ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	      return;
+	    }
+	  }
+	}
+      } else if ((ntohs(get_u_int16_t(packet->payload, 2)) & 0xf800) == 0x8000) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		 "possible netbios name query response\n");
+
+	if (get_u_int16_t(packet->payload, 4) == 0 &&
+	    get_u_int16_t(packet->payload, 6) == htons(1) &&
+	    get_u_int16_t(packet->payload, 8) == 0 && get_u_int16_t(packet->payload, 10) == 0) {
+
+	  /* name is encoded as described in rfc883 */
+	  u_int8_t name_length = packet->payload[12];
+
+	  NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		   "possible netbios positive name query response, one answer\n");
+
+	  if (packet->payload_packet_len >= 12 + 1 + name_length + 1 + 2 + 2) {
+
+	    NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		     "possible netbios name query response, length matches\n");
+
+	    /* null terminated? */
+	    if (packet->payload[12 + name_length + 1] == 0 &&
+		get_u_int16_t(packet->payload, 12 + name_length + 2) == htons(0x0020) &&
+		get_u_int16_t(packet->payload, 12 + name_length + 4) == htons(0x0001)) {
+
+	      NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		       "found netbios name query response\n");
+	      ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	      return;
+	    }
+	  }
+	} else if (get_u_int16_t(packet->payload, 4) == 0 &&
+		   get_u_int16_t(packet->payload, 6) == 0 &&
+		   get_u_int16_t(packet->payload, 8) == 0 && get_u_int16_t(packet->payload, 10) == 0) {
+
+	  /* name is encoded as described in rfc883 */
+	  u_int8_t name_length = packet->payload[12];
+
+	  NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		   "possible netbios negative name query response, one answer\n");
+
+	  if (packet->payload_packet_len >= 12 + 1 + name_length + 1 + 2 + 2) {
+
+	    NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		     "possible netbios name query response, length matches\n");
+
+	    /* null terminated? */
+	    if (packet->payload[12 + name_length + 1] == 0 &&
+		get_u_int16_t(packet->payload, 12 + name_length + 2) == htons(0x000A) &&
+		get_u_int16_t(packet->payload, 12 + name_length + 4) == htons(0x0001)) {
+
+	      NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		       "found netbios name query response\n");
+	      ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	      return;
+	    }
+	  }
+	} else if (get_u_int16_t(packet->payload, 4) == 0 &&
+		   get_u_int16_t(packet->payload, 6) == 0 &&
+		   get_u_int16_t(packet->payload, 8) == htons(1) && get_u_int16_t(packet->payload, 10) == htons(1)) {
+
+	  /* name is encoded as described in rfc883 */
+	  u_int8_t name_length = packet->payload[12];
+
+	  NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		   "possible netbios redirect name query response, one answer\n");
+
+	  if (packet->payload_packet_len >= 12 + 1 + name_length + 1 + 2 + 2) {
+
+	    NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		     "possible netbios name query response, length matches\n");
+
+	    /* null terminated? */
+	    if (packet->payload[12 + name_length + 1] == 0 &&
+		get_u_int16_t(packet->payload, 12 + name_length + 2) == htons(0x0002) &&
+		get_u_int16_t(packet->payload, 12 + name_length + 4) == htons(0x0001)) {
+
+	      NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+		       "found netbios name query response\n");
+	      ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	      return;
+	    }
+	  }
+	}
+      }
+      /* TODO: extend according to rfc1002 */
+    }
+
+    /*check standard NETBIOS over udp to port 138 */
+
+    /*netbios header token from http://www.protocolbase.net/protocols/protocol_NBDGM.php */
+
+    if ((dport == 138) &&
+	packet->payload_packet_len >= 14 &&
+	ntohs(get_u_int16_t(packet->payload, 10)) == packet->payload_packet_len - 14) {
+
+      NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+	       NDPI_LOG_DEBUG, "found netbios port 138 and payload length >= 112 \n");
+
+      if (packet->payload[0] >= 0x11 && packet->payload[0] <= 0x16) {
+
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		 NDPI_LOG_DEBUG, "found netbios with MSG-type 0x11,0x12,0x13,0x14,0x15 or 0x16\n");
+
+	if (ntohl(get_u_int32_t(packet->payload, 4)) == ntohl(packet->iph->saddr)) {
+	  char name[32];
+
+	  NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		   NDPI_LOG_DEBUG, "found netbios with checked ip-address.\n");
+
+	  if(netbios_name_interpret((char*)&packet->payload[14], name, sizeof(name)) > 0)
+	    snprintf((char*)flow->host_server_name, sizeof(flow->host_server_name), "%s", name);
+
+	  ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	  return;
+	}
+      }
+    }
+  }
+
+  if (packet->tcp != NULL) {
+    dport = ntohs(packet->tcp->dest);
+
+    NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG, "netbios tcp start\n");
+
+    /* destination port must be 139 */
+    if (dport == 139) {
+
+      NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG, "found netbios with destination port 139\n");
+
+      /* payload_packet_len must be 72 */
+      if (packet->payload_packet_len == 72) {
+	NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		 NDPI_LOG_DEBUG, "found netbios with payload_packen_len = 72. \n");
+
+	if (packet->payload[0] == 0x81 && packet->payload[1] == 0 && ntohs(get_u_int16_t(packet->payload, 2)) == 68) {
+	  NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+		   NDPI_LOG_DEBUG,
+		   "found netbios with session request = 81, flags=0 and length od following bytes = 68. \n");
+
+	  ndpi_int_netbios_add_connection(ndpi_struct, flow);
+	  return;
+	}
+      }
+    }
+
+  }
+
+  NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG, "exclude netbios\n");
+  NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_NETBIOS);
+
+}
+#endif