:bulb: Add Apache JServ Protocol Dissector

1 files changed, 153 insertions, 0 deletions

diff --git a/src/lib/protocols/ajp.c b/src/lib/protocols/ajp.c
new file mode 100644
index 000000000..ed7bb83f7
--- /dev/null
+++ b/src/lib/protocols/ajp.c
@@ -0,0 +1,153 @@
+/*
+ * ajp.c
+ *
+ * Copyright (C) 2018 by Leonn Paiva <leonn.paiva@gmail.com>
+ *
+ * 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_protocol_ids.h"
+
+#ifdef NDPI_PROTOCOL_AJP
+
+#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_AJP
+
+#include "ndpi_api.h"
+
+enum ajp_direction {
+  AJP_SERVER_TO_CONTAINER = 0x1234,
+  AJP_CONTAINER_TO_SERVER = 0x4142
+};
+
+enum ajp_packet_type {
+  AJP_UNKNOWN = 0,
+
+   /* packet types */
+  AJP_FORWARD_REQUEST = 2,
+  AJP_SEND_BODY_CHUNK = 3,
+  AJP_SEND_HEADERS = 4,
+  AJP_END_RESPONSE = 5,
+  AJP_GET_BODY_CHUNK = 6,
+  AJP_SHUTDOWN = 7,
+  AJP_PING = 8,
+  AJP_CPONG = 9,
+  AJP_CPING = 10,
+  AJP_BODY = 11
+};
+
+struct ajp_header {
+  uint16_t magic;
+  uint16_t len;
+  uint8_t code;
+};
+
+static void set_ajp_detected(struct ndpi_detection_module_struct *ndpi_struct,
+           struct ndpi_flow_struct *flow) {
+
+  if(flow->detected_protocol_stack[0] == NDPI_PROTOCOL_UNKNOWN) {
+    ndpi_search_tcp_or_udp(ndpi_struct, flow);
+
+    /* If no custom protocol has been detected */
+    /* if(flow->detected_protocol_stack[0] == NDPI_PROTOCOL_UNKNOWN) */
+      ndpi_int_reset_protocol(flow);
+      ndpi_set_detected_protocol(ndpi_struct, flow, flow->guessed_host_protocol_id, NDPI_PROTOCOL_AJP);
+  }
+}
+
+
+/*************************************************************************************************/
+
+static void ndpi_check_ajp(struct ndpi_detection_module_struct *ndpi_struct,
+  struct ndpi_flow_struct *flow)
+{
+  struct ajp_header ajp_hdr;
+
+  struct ndpi_packet_struct *packet = &flow->packet;
+
+  if (packet->payload_packet_len < 5 /* ajp_header size*/) {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  ajp_hdr = *((struct ajp_header *) (packet->payload));
+  ajp_hdr.magic = ntohs(ajp_hdr.magic);
+  ajp_hdr.len = ntohs(ajp_hdr.len);
+
+  if (ajp_hdr.len > 0 && ajp_hdr.magic == AJP_SERVER_TO_CONTAINER) {
+    if (ajp_hdr.code == AJP_FORWARD_REQUEST || ajp_hdr.code == AJP_SHUTDOWN
+        || ajp_hdr.code == AJP_PING || ajp_hdr.code == AJP_CPING) {
+
+      set_ajp_detected(ndpi_struct, flow);
+
+    } else {
+      NDPI_LOG_DBG(ndpi_struct, "Invalid AJP request type");
+      NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    }
+  } else if (ajp_hdr.len > 0 && ajp_hdr.magic == AJP_CONTAINER_TO_SERVER) {
+    if (ajp_hdr.code == AJP_SEND_BODY_CHUNK || ajp_hdr.code == AJP_SEND_HEADERS
+        || ajp_hdr.code == AJP_END_RESPONSE || ajp_hdr.code == AJP_GET_BODY_CHUNK
+        || ajp_hdr.code == AJP_CPONG) {
+
+      set_ajp_detected(ndpi_struct, flow);
+
+    } else {
+      NDPI_LOG_DBG(ndpi_struct, "Invalid AJP response type");
+      NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    }
+  } else {
+    NDPI_LOG_DBG(ndpi_struct,"Invalid AJP packet\n");
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+  }
+}
+
+void ndpi_search_ajp(struct ndpi_detection_module_struct *ndpi_struct,
+ struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+
+  // Break after 20 packets.
+  if(flow->packet_counter > 20) {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  if(packet->detected_protocol_stack[0] != NDPI_PROTOCOL_UNKNOWN) {
+    return;
+  }
+
+  NDPI_LOG_DBG(ndpi_struct, "search AJP\n");
+  ndpi_check_ajp(ndpi_struct, flow);
+
+  return;
+}
+
+/* ********************************* */
+
+
+void init_ajp_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+  u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+  ndpi_set_bitmask_protocol_detection("AJP", ndpi_struct, detection_bitmask,
+    *id, NDPI_PROTOCOL_AJP, ndpi_search_ajp,
+    NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD,
+    SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+    ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}
+
+#endif