forked from osmocom/wireshark
210 lines
7.2 KiB
C
210 lines
7.2 KiB
C
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/* packet-ms-nns.c
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* Routines for .NET NegotiateStream Protocol (MS-NNS) dissection
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* Copyright 2020, Uli Heilmeier <uh@heilmeier.eu>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wieshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/*
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* Basic dissector for .NET NegotiateStream Protocol based on protocol reference found at
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* https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-NNS/%5bMS-NNS%5d.pdf
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*/
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#include <config.h>
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#include <epan/packet.h>
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#include <epan/conversation.h>
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/* Prototypes */
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void proto_reg_handoff_nns(void);
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void proto_register_nns(void);
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static dissector_handle_t gssapi_handle;
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#define MS_NNS_MESSAGE_HANDSHAKE_DONE 20
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#define MS_NNS_MESSAGE_HANDSHAKE_ERROR 21
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#define MS_NNS_MESSAGE_HANDSHAKE_PROGRESS 22
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static const value_string nns_message_id_vals[] = {
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{ MS_NNS_MESSAGE_HANDSHAKE_DONE, "Handshake Done" },
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{ MS_NNS_MESSAGE_HANDSHAKE_ERROR, "Handshake Error" },
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{ MS_NNS_MESSAGE_HANDSHAKE_PROGRESS, "Handshake In Progress" },
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{ 0, NULL}
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};
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struct nns_session_state {
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guint32 handshake_done;
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gboolean first_handshake_done;
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};
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static int proto_nns = -1;
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static int hf_nns_message_id = -1;
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static int hf_nns_major_version = -1;
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static int hf_nns_minor_version = -1;
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static int hf_nns_auth_payload_size = -1;
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static int hf_nns_auth_payload = -1;
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static int hf_nns_payload_size = -1;
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static int hf_nns_payload = -1;
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static gint ett_nns = -1;
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static gint ett_nns_payload = -1;
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#define MS_NNS_MIN_LENGTH 4
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static int
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dissect_nns(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_item *ti, *pti;
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proto_tree *nns_tree, *payload_tree;
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guint offset = 0;
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guint32 message_id;
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guint32 payload_size;
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conversation_t *conversation;
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tvbuff_t *nt_tvb;
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gint remaining;
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struct nns_session_state *session_state;
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if (tvb_reported_length(tvb) < MS_NNS_MIN_LENGTH)
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return 0;
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conversation = find_or_create_conversation(pinfo);
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session_state = (struct nns_session_state *)conversation_get_proto_data(conversation, proto_nns);
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if (!session_state) {
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session_state = wmem_new0(wmem_file_scope(), struct nns_session_state);
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conversation_add_proto_data(conversation, proto_nns, session_state);
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}
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MS-NNS");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_nns, tvb, 0, -1, ENC_NA);
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nns_tree = proto_item_add_subtree(ti, ett_nns);
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/* As it is unknown if there is a one-way Handshake Done or a two-way Handshake Done we check the first frame
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* after the first Handshake Done if it looks like a Handshake Done message (0x140100). */
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if ( session_state->handshake_done && session_state->handshake_done < pinfo->num &&
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!(session_state->first_handshake_done && tvb_get_ntoh24(tvb, offset) == 0x140100)) {
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proto_tree_add_item_ret_uint(nns_tree, hf_nns_payload_size, tvb, offset, 4, ENC_LITTLE_ENDIAN, &payload_size);
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offset += 4;
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col_append_str(pinfo->cinfo, COL_INFO, "Data");
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if ( payload_size > 0) {
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remaining = tvb_reported_length_remaining(tvb, offset);
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if ((guint32) remaining < payload_size) {
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pinfo->desegment_offset = offset - 4;
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pinfo->desegment_len = payload_size - remaining;
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return (offset - 4);
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}
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proto_tree_add_item(nns_tree, hf_nns_payload, tvb, offset, payload_size, ENC_NA);
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offset += payload_size;
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session_state->first_handshake_done = FALSE;
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}
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}
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else {
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proto_tree_add_item_ret_uint(nns_tree, hf_nns_message_id, tvb, offset, 1, ENC_NA, &message_id);
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offset += 1;
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, ", ", "%s", val_to_str_const(message_id, nns_message_id_vals, "Unknown Record"));
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proto_tree_add_item(nns_tree, hf_nns_major_version, tvb, offset, 1, ENC_NA);
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offset += 1;
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proto_tree_add_item(nns_tree, hf_nns_minor_version, tvb, offset, 1, ENC_NA);
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offset += 1;
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proto_tree_add_item_ret_uint(nns_tree, hf_nns_auth_payload_size, tvb, offset, 2, ENC_BIG_ENDIAN, &payload_size);
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offset += 2;
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if ( payload_size > 0) {
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if ((guint32) tvb_reported_length_remaining(tvb, offset) < payload_size) {
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pinfo->desegment_offset = offset - 5;
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pinfo->desegment_len = payload_size;
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return (offset - 5);
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}
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pti = proto_tree_add_item(nns_tree, hf_nns_auth_payload, tvb, offset, payload_size, ENC_NA);
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if (message_id == MS_NNS_MESSAGE_HANDSHAKE_DONE || message_id == MS_NNS_MESSAGE_HANDSHAKE_PROGRESS) {
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nt_tvb = tvb_new_subset_length(tvb, offset, payload_size);
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payload_tree = proto_item_add_subtree(pti, ett_nns_payload);
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call_dissector(gssapi_handle, nt_tvb, pinfo, payload_tree);
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}
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offset += payload_size;
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}
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if ( message_id == MS_NNS_MESSAGE_HANDSHAKE_DONE) {
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session_state->handshake_done = pinfo->num;
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session_state->first_handshake_done = (session_state->first_handshake_done ? FALSE : TRUE);
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}
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}
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return offset;
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}
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void proto_register_nns(void)
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{
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static hf_register_info hf[] = {
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{ &hf_nns_message_id,
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{ "MessageID", "ms-nns.message_id",
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FT_UINT8, BASE_DEC, VALS(nns_message_id_vals), 0x0,
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NULL, HFILL }
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},
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{ &hf_nns_major_version,
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{ "Major Version", "ms-nns.major_version",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_nns_minor_version,
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{ "Minor Version", "ms-nns.minor_version",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_nns_auth_payload_size,
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{ "Auth Payload Size", "ms-nns.auth_payload_size",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_nns_auth_payload,
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{ "Auth Payload", "ms-nns.known_encoding",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_nns_payload_size,
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{ "Payload Size", "ms-nns.payload_size",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_nns_payload,
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{ "Payload", "ms-nns.payload",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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}
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};
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static gint *ett[] = {
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&ett_nns,
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&ett_nns_payload
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};
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proto_nns = proto_register_protocol(".NET NegotiateStream Protocol", "MS-NNS", "ms-nns");
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proto_register_field_array(proto_nns, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("ms-nns", dissect_nns, proto_nns);
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}
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void proto_reg_handoff_nns(void)
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{
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gssapi_handle = find_dissector("gssapi");
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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