![Gregor Jasny](/assets/img/avatar_default.png)
This adds the possibility to filter on the negotiated WebSocket protocol from the upgrade response as well as on a specific TCP port Bug: 12298 Change-Id: I8e0b785cec0b8c71ec558b74ac07c81194268b38 Signed-off-by: Gregor Jasny <gjasny@googlemail.com> Reviewed-on: https://code.wireshark.org/review/14645 Petri-Dish: Michael Mann <mmann78@netscape.net> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Michael Mann <mmann78@netscape.net>
585 lines
19 KiB
C
585 lines
19 KiB
C
/* packet-websocket.c
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* Routines for WebSocket dissection
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* Copyright 2012, Alexis La Goutte <alexis.lagoutte@gmail.com>
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* 2015, Peter Wu <peter@lekensteyn.nl>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/conversation.h>
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include <epan/prefs.h>
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#include "packet-http.h"
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#include "packet-tcp.h"
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/*
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* The information used comes from:
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* RFC6455: The WebSocket Protocol
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* http://www.iana.org/assignments/websocket (last updated 2012-04-12)
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*/
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void proto_register_websocket(void);
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void proto_reg_handoff_websocket(void);
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static dissector_handle_t text_lines_handle;
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static dissector_handle_t json_handle;
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static dissector_handle_t sip_handle;
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#define WEBSOCKET_NONE 0
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#define WEBSOCKET_TEXT 1
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#define WEBSOCKET_JSON 2
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#define WEBSOCKET_SIP 3
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static gint pref_text_type = WEBSOCKET_NONE;
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/* Initialize the protocol and registered fields */
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static int proto_websocket = -1;
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static int proto_http = -1;
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static int hf_ws_fin = -1;
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static int hf_ws_reserved = -1;
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static int hf_ws_opcode = -1;
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static int hf_ws_mask = -1;
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static int hf_ws_payload_length = -1;
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static int hf_ws_payload_length_ext_16 = -1;
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static int hf_ws_payload_length_ext_64 = -1;
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static int hf_ws_masking_key = -1;
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static int hf_ws_payload = -1;
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static int hf_ws_masked_payload = -1;
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static int hf_ws_payload_continue = -1;
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static int hf_ws_payload_close = -1;
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static int hf_ws_payload_close_status_code = -1;
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static int hf_ws_payload_close_reason = -1;
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static int hf_ws_payload_ping = -1;
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static int hf_ws_payload_pong = -1;
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static int hf_ws_payload_unknown = -1;
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static gint ett_ws = -1;
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static gint ett_ws_pl = -1;
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static gint ett_ws_mask = -1;
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static gint ett_ws_control_close = -1;
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static expert_field ei_ws_payload_unknown = EI_INIT;
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#define WS_CONTINUE 0x0
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#define WS_TEXT 0x1
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#define WS_BINARY 0x2
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#define WS_CLOSE 0x8
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#define WS_PING 0x9
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#define WS_PONG 0xA
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static const value_string ws_opcode_vals[] = {
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{ WS_CONTINUE, "Continuation" },
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{ WS_TEXT, "Text" },
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{ WS_BINARY, "Binary" },
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{ WS_CLOSE, "Connection Close" },
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{ WS_PING, "Ping" },
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{ WS_PONG, "Pong" },
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{ 0, NULL}
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};
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#define MASK_WS_FIN 0x80
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#define MASK_WS_RSV 0x70
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#define MASK_WS_OPCODE 0x0F
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#define MASK_WS_MASK 0x80
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#define MASK_WS_PAYLOAD_LEN 0x7F
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static const value_string ws_close_status_code_vals[] = {
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{ 1000, "Normal Closure" },
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{ 1001, "Going Away" },
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{ 1002, "Protocol error" },
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{ 1003, "Unsupported Data" },
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{ 1004, "---Reserved----" },
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{ 1005, "No Status Rcvd" },
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{ 1006, "Abnormal Closure" },
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{ 1007, "Invalid frame payload data" },
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{ 1008, "Policy Violation" },
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{ 1009, "Message Too Big" },
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{ 1010, "Mandatory Ext." },
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{ 1011, "Internal Server" },
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{ 1015, "TLS handshake" },
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{ 0, NULL}
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};
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static dissector_table_t port_subdissector_table;
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static dissector_table_t protocol_subdissector_table;
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static heur_dissector_list_t heur_subdissector_list;
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#define MAX_UNMASKED_LEN (1024 * 256)
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static tvbuff_t *
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tvb_unmasked(tvbuff_t *tvb, packet_info *pinfo, const guint offset, guint payload_length, const guint8 *masking_key)
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{
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gchar *data_unmask;
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guint i;
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const guint8 *data_mask;
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guint unmasked_length = payload_length > MAX_UNMASKED_LEN ? MAX_UNMASKED_LEN : payload_length;
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data_unmask = (gchar *)wmem_alloc(pinfo->pool, unmasked_length);
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data_mask = tvb_get_ptr(tvb, offset, unmasked_length);
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/* Unmasked(XOR) Data... */
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for(i=0; i < unmasked_length; i++) {
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data_unmask[i] = data_mask[i] ^ masking_key[i%4];
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}
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return tvb_new_real_data(data_unmask, unmasked_length, payload_length);
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}
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static void
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dissect_websocket_control_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint8 opcode)
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{
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proto_item *ti;
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proto_tree *subtree;
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const guint offset = 0, length = tvb_reported_length(tvb);
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switch (opcode) {
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case WS_CLOSE: /* Close */
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ti = proto_tree_add_item(tree, hf_ws_payload_close, tvb, offset, length, ENC_NA);
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subtree = proto_item_add_subtree(ti, ett_ws_control_close);
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/* Close frame MAY contain a body. */
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if (length >= 2) {
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proto_tree_add_item(subtree, hf_ws_payload_close_status_code, tvb, offset, 2, ENC_BIG_ENDIAN);
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if (length > 2)
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proto_tree_add_item(subtree, hf_ws_payload_close_reason, tvb, offset+2, length-2, ENC_UTF_8|ENC_NA);
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}
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break;
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case WS_PING: /* Ping */
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proto_tree_add_item(tree, hf_ws_payload_ping, tvb, offset, length, ENC_NA);
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break;
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case WS_PONG: /* Pong */
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proto_tree_add_item(tree, hf_ws_payload_pong, tvb, offset, length, ENC_NA);
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break;
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default: /* Unknown */
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ti = proto_tree_add_item(tree, hf_ws_payload_unknown, tvb, offset, length, ENC_NA);
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expert_add_info_format(pinfo, ti, &ei_ws_payload_unknown, "Dissector for Websocket Opcode (%d)"
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" code not implemented, Contact Wireshark developers"
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" if you want this supported", opcode);
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break;
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}
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}
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static void
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dissect_websocket_data_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_tree *pl_tree, guint8 opcode)
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{
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proto_item *ti;
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const guint offset = 0, length = tvb_reported_length(tvb);
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dissector_handle_t handle = NULL;
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heur_dtbl_entry_t *hdtbl_entry;
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conversation_t *conv;
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http_conv_t *http_conv = NULL;
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/* try to find a dissector which accepts the data. */
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conv = find_conversation(pinfo->num, &pinfo->src, &pinfo->dst, pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
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if (conv) {
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http_conv = (http_conv_t *)conversation_get_proto_data(conv, proto_http);
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if (http_conv) {
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if (http_conv->websocket_protocol) {
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handle = dissector_get_string_handle(protocol_subdissector_table, http_conv->websocket_protocol);
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} else if (!handle) {
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handle = dissector_get_uint_handle(port_subdissector_table, http_conv->server_port);
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}
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}
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}
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if (handle) {
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call_dissector_only(handle, tvb, pinfo, tree, NULL);
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return; /* handle found, assume dissector took care of it. */
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} else if (dissector_try_heuristic(heur_subdissector_list, tvb, pinfo, tree, &hdtbl_entry, NULL)) {
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return; /* heuristics dissector handled it. */
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}
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/* no dissector wanted it, try to print something appropriate. */
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switch (opcode) {
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case WS_TEXT: /* Text */
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{
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const gchar *saved_match_string = pinfo->match_string;
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pinfo->match_string = NULL;
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switch (pref_text_type) {
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case WEBSOCKET_TEXT:
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case WEBSOCKET_NONE:
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default:
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/* Assume that most text protocols are line-based. */
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call_dissector(text_lines_handle, tvb, pinfo, tree);
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break;
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case WEBSOCKET_JSON:
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call_dissector(json_handle, tvb, pinfo, tree);
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break;
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case WEBSOCKET_SIP:
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call_dissector(sip_handle, tvb, pinfo, tree);
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break;
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}
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pinfo->match_string = saved_match_string;
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}
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break;
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case WS_BINARY: /* Binary */
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call_data_dissector(tvb, pinfo, tree);
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break;
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default: /* Unknown */
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ti = proto_tree_add_item(pl_tree, hf_ws_payload_unknown, tvb, offset, length, ENC_NA);
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expert_add_info_format(pinfo, ti, &ei_ws_payload_unknown, "Dissector for Websocket Opcode (%d)"
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" code not implemented, Contact Wireshark developers"
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" if you want this supported", opcode);
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break;
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}
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}
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static void
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dissect_websocket_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_tree *ws_tree, guint8 opcode)
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{
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const guint offset = 0, length = tvb_reported_length(tvb);
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proto_item *ti;
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proto_tree *pl_tree;
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tvbuff_t *tvb_appdata;
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/* Payload */
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ti = proto_tree_add_item(ws_tree, hf_ws_payload, tvb, offset, length, ENC_NA);
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pl_tree = proto_item_add_subtree(ti, ett_ws_pl);
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/* Extension Data */
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/* TODO: Add dissector of Extension (not extension available for the moment...) */
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/* Application Data */
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if (opcode == WS_CONTINUE) {
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proto_tree_add_item(tree, hf_ws_payload_continue, tvb, offset, length, ENC_NA);
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/* TODO: Add Fragmentation support (needs FIN bit)
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* https://tools.ietf.org/html/rfc6455#section-5.4 */
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return;
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}
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/* Right now this is exactly the same, this may change when exts. are added.
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tvb_appdata = tvb_new_subset(tvb, offset, length, length);
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*/
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tvb_appdata = tvb;
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if (opcode & 8) { /* Control frames have MSB set. */
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dissect_websocket_control_frame(tvb_appdata, pinfo, pl_tree, opcode);
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} else {
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dissect_websocket_data_frame(tvb_appdata, pinfo, tree, pl_tree, opcode);
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}
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}
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static int
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dissect_websocket_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_item *ti, *ti_len;
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guint8 fin, opcode;
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gboolean mask;
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guint short_length, payload_length;
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guint payload_offset, mask_offset;
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proto_tree *ws_tree;
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const guint8 *masking_key = NULL;
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tvbuff_t *tvb_payload;
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short_length = tvb_get_guint8(tvb, 1) & MASK_WS_PAYLOAD_LEN;
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mask_offset = 2;
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if (short_length == 126) {
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payload_length = tvb_get_ntohs(tvb, 2);
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mask_offset += 2;
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} else if (short_length == 127) {
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/* warning C4244: '=' : conversion from 'guint64' to 'guint ', possible loss of data */
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payload_length = (guint)tvb_get_ntoh64(tvb, 2);
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mask_offset += 8;
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} else {
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payload_length = short_length;
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}
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/* Mask */
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mask = (tvb_get_guint8(tvb, 1) & MASK_WS_MASK) != 0;
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payload_offset = mask_offset + (mask ? 4 : 0);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "WebSocket");
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col_set_str(pinfo->cinfo, COL_INFO, "WebSocket");
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ti = proto_tree_add_item(tree, proto_websocket, tvb, 0, payload_offset, ENC_NA);
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ws_tree = proto_item_add_subtree(ti, ett_ws);
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/* Flags */
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proto_tree_add_item(ws_tree, hf_ws_fin, tvb, 0, 1, ENC_NA);
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fin = (tvb_get_guint8(tvb, 0) & MASK_WS_FIN) >> 4;
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proto_tree_add_item(ws_tree, hf_ws_reserved, tvb, 0, 1, ENC_BIG_ENDIAN);
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/* Opcode */
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proto_tree_add_item(ws_tree, hf_ws_opcode, tvb, 0, 1, ENC_BIG_ENDIAN);
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opcode = tvb_get_guint8(tvb, 0) & MASK_WS_OPCODE;
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col_append_fstr(pinfo->cinfo, COL_INFO, " %s", val_to_str_const(opcode, ws_opcode_vals, "Unknown Opcode"));
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col_append_str(pinfo->cinfo, COL_INFO, fin ? " [FIN]" : " ");
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/* Add Mask bit to the tree */
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proto_tree_add_item(ws_tree, hf_ws_mask, tvb, 1, 1, ENC_NA);
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col_append_str(pinfo->cinfo, COL_INFO, mask ? " [MASKED]" : " ");
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/* (Extended) Payload Length */
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ti_len = proto_tree_add_item(ws_tree, hf_ws_payload_length, tvb, 1, 1, ENC_BIG_ENDIAN);
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if (short_length == 126) {
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proto_item_append_text(ti_len, " Extended Payload Length (16 bits)");
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proto_tree_add_item(ws_tree, hf_ws_payload_length_ext_16, tvb, 2, 2, ENC_BIG_ENDIAN);
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}
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else if (short_length == 127) {
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proto_item_append_text(ti_len, " Extended Payload Length (64 bits)");
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proto_tree_add_item(ws_tree, hf_ws_payload_length_ext_64, tvb, 2, 8, ENC_BIG_ENDIAN);
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}
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/* Masking-key */
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if (mask) {
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proto_tree_add_item(ws_tree, hf_ws_masking_key, tvb, mask_offset, 4, ENC_NA);
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masking_key = tvb_get_ptr(tvb, mask_offset, 4);
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}
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if (payload_length > 0) {
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/* Always unmask payload data before analysing it. */
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if (mask) {
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proto_tree_add_item(ws_tree, hf_ws_masked_payload, tvb, payload_offset, payload_length, ENC_NA);
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tvb_payload = tvb_unmasked(tvb, pinfo, payload_offset, payload_length, masking_key);
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tvb_set_child_real_data_tvbuff(tvb, tvb_payload);
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add_new_data_source(pinfo, tvb_payload, "Unmasked data");
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} else {
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tvb_payload = tvb_new_subset(tvb, payload_offset, payload_length, payload_length);
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}
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dissect_websocket_payload(tvb_payload, pinfo, tree, ws_tree, opcode);
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}
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return tvb_captured_length(tvb);
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}
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static guint
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get_websocket_frame_length(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
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{
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guint frame_length, payload_length;
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gboolean mask;
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frame_length = 2; /* flags, opcode and Payload length */
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mask = tvb_get_guint8(tvb, offset + 1) & MASK_WS_MASK;
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payload_length = tvb_get_guint8(tvb, offset + 1) & MASK_WS_PAYLOAD_LEN;
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offset += 2; /* Skip flags, opcode and Payload length */
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/* Check for Extended Payload Length. */
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if (payload_length == 126) {
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if (tvb_reported_length_remaining(tvb, offset) < 2)
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return 0; /* Need more data. */
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payload_length = tvb_get_ntohs(tvb, offset);
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frame_length += 2; /* Extended payload length */
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} else if (payload_length == 127) {
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if (tvb_reported_length_remaining(tvb, offset) < 8)
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return 0; /* Need more data. */
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payload_length = (guint)tvb_get_ntoh64(tvb, offset);
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frame_length += 8; /* Extended payload length */
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}
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if (mask)
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frame_length += 4; /* Masking-key */
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frame_length += payload_length; /* Payload data */
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return frame_length;
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}
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static int
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dissect_websocket(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
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{
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/* Need at least two bytes for flags, opcode and Payload length. */
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tcp_dissect_pdus(tvb, pinfo, tree, TRUE, 2,
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get_websocket_frame_length, dissect_websocket_frame, data);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_websocket(void)
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{
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static hf_register_info hf[] = {
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{ &hf_ws_fin,
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{ "Fin", "websocket.fin",
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FT_BOOLEAN, 8, NULL, MASK_WS_FIN,
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"Indicates that this is the final fragment in a message", HFILL }
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},
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{ &hf_ws_reserved,
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{ "Reserved", "websocket.rsv",
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FT_UINT8, BASE_HEX, NULL, MASK_WS_RSV,
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"Must be zero", HFILL }
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},
|
|
{ &hf_ws_opcode,
|
|
{ "Opcode", "websocket.opcode",
|
|
FT_UINT8, BASE_DEC, VALS(ws_opcode_vals), MASK_WS_OPCODE,
|
|
"Defines the interpretation of the Payload data", HFILL }
|
|
},
|
|
{ &hf_ws_mask,
|
|
{ "Mask", "websocket.mask",
|
|
FT_BOOLEAN, 8, NULL, MASK_WS_MASK,
|
|
"Defines whether the Payload data is masked", HFILL }
|
|
},
|
|
{ &hf_ws_payload_length,
|
|
{ "Payload length", "websocket.payload_length",
|
|
FT_UINT8, BASE_DEC, NULL, MASK_WS_PAYLOAD_LEN,
|
|
"The length of the Payload data", HFILL }
|
|
},
|
|
{ &hf_ws_payload_length_ext_16,
|
|
{ "Extended Payload length (16 bits)", "websocket.payload_length_ext_16",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"The length (16 bits) of the Payload data", HFILL }
|
|
},
|
|
{ &hf_ws_payload_length_ext_64,
|
|
{ "Extended Payload length (64 bits)", "websocket.payload_length_ext_64",
|
|
FT_UINT64, BASE_DEC, NULL, 0x0,
|
|
"The length (64 bits) of the Payload data", HFILL }
|
|
},
|
|
{ &hf_ws_masking_key,
|
|
{ "Masking-Key", "websocket.masking_key",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"All frames sent from the client to the server are masked by a 32-bit value that is contained within the frame", HFILL }
|
|
},
|
|
{ &hf_ws_payload,
|
|
{ "Payload", "websocket.payload",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"Payload (after unmasking)", HFILL }
|
|
},
|
|
{ &hf_ws_masked_payload,
|
|
{ "Masked payload", "websocket.masked_payload",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_ws_payload_continue,
|
|
{ "Continue", "websocket.payload.continue",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_ws_payload_close,
|
|
{ "Close", "websocket.payload.close",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_ws_payload_close_status_code,
|
|
{ "Status code", "websocket.payload.close.status_code",
|
|
FT_UINT16, BASE_DEC, VALS(ws_close_status_code_vals), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_ws_payload_close_reason,
|
|
{ "Reason", "websocket.payload.close.reason",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_ws_payload_ping,
|
|
{ "Ping", "websocket.payload.ping",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_ws_payload_pong,
|
|
{ "Pong", "websocket.payload.pong",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_ws_payload_unknown,
|
|
{ "Unknown", "websocket.payload.unknown",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
};
|
|
|
|
|
|
static gint *ett[] = {
|
|
&ett_ws,
|
|
&ett_ws_pl,
|
|
&ett_ws_mask,
|
|
&ett_ws_control_close,
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_ws_payload_unknown, { "websocket.payload.unknown.expert", PI_UNDECODED, PI_NOTE, "Dissector for Websocket Opcode", EXPFILL }},
|
|
};
|
|
|
|
static const enum_val_t text_types[] = {
|
|
{"None", "No subdissection", WEBSOCKET_NONE},
|
|
{"Line based text", "Line based text", WEBSOCKET_TEXT},
|
|
{"As JSON", "As json", WEBSOCKET_JSON},
|
|
{"As SIP", "As SIP", WEBSOCKET_SIP},
|
|
{NULL, NULL, -1}
|
|
};
|
|
|
|
module_t *websocket_module;
|
|
expert_module_t* expert_websocket;
|
|
|
|
proto_websocket = proto_register_protocol("WebSocket",
|
|
"WebSocket", "websocket");
|
|
|
|
/*
|
|
* Heuristic dissectors SHOULD register themselves in
|
|
* this table using the standard heur_dissector_add()
|
|
* function.
|
|
*/
|
|
heur_subdissector_list = register_heur_dissector_list("ws", proto_websocket);
|
|
|
|
port_subdissector_table = register_dissector_table("ws.port",
|
|
"TCP port for protocols using WebSocket", proto_websocket, FT_UINT16, BASE_DEC, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
|
|
|
|
protocol_subdissector_table = register_dissector_table("ws.protocol",
|
|
"Negotiated WebSocket protocol", proto_websocket, FT_STRING, BASE_NONE, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
|
|
|
|
proto_register_field_array(proto_websocket, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_websocket = expert_register_protocol(proto_websocket);
|
|
expert_register_field_array(expert_websocket, ei, array_length(ei));
|
|
|
|
register_dissector("websocket", dissect_websocket, proto_websocket);
|
|
|
|
websocket_module = prefs_register_protocol(proto_websocket, proto_reg_handoff_websocket);
|
|
|
|
prefs_register_enum_preference(websocket_module, "text_type",
|
|
"Dissect websocket text as",
|
|
"Select dissector for websocket text",
|
|
&pref_text_type, text_types, WEBSOCKET_NONE);
|
|
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_websocket(void)
|
|
{
|
|
text_lines_handle = find_dissector_add_dependency("data-text-lines", proto_websocket);
|
|
json_handle = find_dissector_add_dependency("json", proto_websocket);
|
|
sip_handle = find_dissector_add_dependency("sip", proto_websocket);
|
|
|
|
proto_http = proto_get_id_by_filter_name("http");
|
|
}
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|