1276 lines
32 KiB
C
1276 lines
32 KiB
C
/* packet-msproxy.c
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* Routines for Microsoft Proxy packet dissection
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* Copyright 2000, Jeffrey C. Foster <jfoste@woodward.com>
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* This was derived from the dante socks implementation source code.
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* Most of the information came from common.h and msproxy_clientprotocol.c
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*
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* See http://www.inet.no/dante for more information
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*/
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/************************************************************************
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* *
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* Notes: These are possible command values. User input is welcome *
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* *
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* Command = 0x040a - Remote host closed connection (maybe ?? ) *
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* Command = 0x0411 - Remote host closed connection *
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* Command = 0x0413 - Local host closed connection or SYN worked *
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* *
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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/expert.h>
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#include "packet-tcp.h"
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#include "packet-udp.h"
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void proto_register_msproxy(void);
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void proto_reg_handoff_msproxy(void);
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static int proto_msproxy = -1;
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static int ett_msproxy = -1;
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static int ett_msproxy_name = -1;
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static int hf_msproxy_cmd = -1;
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static int hf_msproxy_clntport = -1;
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static int hf_msproxy_dstaddr = -1;
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/* static int hf_msproxy_srcport = -1; */
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static int hf_msproxy_dstport = -1;
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static int hf_msproxy_serverport = -1;
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static int hf_msproxy_serveraddr = -1;
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static int hf_msproxy_bindport = -1;
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static int hf_msproxy_bindaddr = -1;
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static int hf_msproxy_boundport = -1;
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static int hf_msproxy_bind_id = -1;
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static int hf_msproxy_resolvaddr = -1;
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static int hf_msproxy_client_id = -1;
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static int hf_msproxy_version = -1;
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static int hf_msproxy_server_id = -1;
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static int hf_msproxy_server_ack = -1;
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static int hf_msproxy_client_ack = -1;
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static int hf_msproxy_seq_num = -1;
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static int hf_msproxy_rwsp_signature = -1;
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static int hf_msproxy_ntlmssp_signature = -1;
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static int hf_msproxy_server_int_addr = -1;
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static int hf_msproxy_server_int_port = -1;
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static int hf_msproxy_server_ext_addr = -1;
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static int hf_msproxy_server_ext_port = -1;
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/* Generated from convert_proto_tree_add_text.pl */
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static int hf_msproxy_host_name = -1;
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static int hf_msproxy_address_offset = -1;
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static int hf_msproxy_client_computer_name = -1;
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static int hf_msproxy_nt_domain = -1;
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static int hf_msproxy_req_resolve_length = -1;
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static int hf_msproxy_application_name = -1;
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static int hf_msproxy_user_name = -1;
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static int hf_msproxy_application = -1;
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static expert_field ei_msproxy_unknown = EI_INIT;
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static expert_field ei_msproxy_unhandled = EI_INIT;
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static dissector_handle_t msproxy_sub_handle;
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#define UDP_PORT_MSPROXY 1745
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#define N_MSPROXY_HELLO 0x05 /* packet 1 from client */
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#define N_MSPROXY_ACK 0x10 /* packet 1 from server */
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#define N_MSPROXY_USERINFO_ACK 0x04 /* packet 2 from server */
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#define N_MSPROXY_AUTH 0x47 /* packet 3 from client */
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#define N_MSPROXY_RESOLVE 0x07 /* Resolve request */
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/*$$$ 0x0500 was dante value, I see 0x05ff and 0x0500 */
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#define MSPROXY_HELLO 0x0500
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#define MSPROXY_HELLO_2 0x05ff
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#define MSPROXY_HELLO_ACK 0x1000
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#define MSPROXY_USERINFO 0x1000
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#define MSPROXY_USERINFO_ACK 0x0400
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#define MSPROXY_AUTH 0x4700
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#define MSPROXY_AUTH_1_ACK 0x4714
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#define MSPROXY_AUTH_2 0x4701
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#define MSPROXY_AUTH_2_ACK 0x4715
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#define MSPROXY_AUTH_2_ACK2 0x4716
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#define MSPROXY_RESOLVE 0x070d
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#define MSPROXY_RESOLVE_ACK 0x070f
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#define MSPROXY_BIND 0x0704
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#define MSPROXY_BIND_ACK 0x0706
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#define MSPROXY_TCP_BIND 0x0707
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#define MSPROXY_TCP_BIND_ACK 0x0708
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#define MSPROXY_LISTEN 0x0406
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#define MSPROXY_BINDINFO 0x0709
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#define MSPROXY_BINDINFO_ACK 0x070a
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#define MSPROXY_CONNECT 0x071e
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#define MSPROXY_CONNECT_ACK 0x0703
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#define MSPROXY_UDPASSOCIATE 0x0705
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#define MSPROXY_UDPASSOCIATE_ACK 0x0706
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#define MSPROXY_UDP_BIND_REQ 0x070b
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#define MSPROXY_CONNECTED 0x042c
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#define MSPROXY_SESSIONEND 0x251e
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#define MSPROXY_BIND_AUTHFAILED 0x0804
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#define MSPROXY_CONNECT_AUTHFAILED 0x081e
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#define MSPROXY_CONNREFUSED 0x4 /* low 12 bits seem to vary. */
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#define FROM_SERVER 1 /* direction of packet data for get_msproxy_cmd_name */
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#define FROM_CLIENT 0
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/*$$$ should this be the same as redirect_entry_t ?? */
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/* then the add_conversation could just copy the structure */
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/* using the same allocation (instance for you object guys) */
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/* wouldn't work because there may be multiple child conversations */
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/* from the same MSProxy conversation */
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typedef struct {
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guint32 dst_addr;
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guint32 clnt_port;
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guint32 dst_port;
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guint32 server_int_port;
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conversation_type ctype;
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}hash_entry_t;
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/************** conversation hash stuff ***************/
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typedef struct {
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guint32 remote_addr;
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guint32 clnt_port;
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guint32 server_int_port;
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guint32 remote_port;
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conversation_type ctype;
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}redirect_entry_t;
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/************** negotiated conversation hash stuff ***************/
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static int msproxy_sub_dissector( tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree, void* data _U_) {
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/* Conversation dissector called from TCP or UDP dissector. Decode and */
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/* display the msproxy header, the pass the rest of the data to the tcp */
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/* or udp port decode routine to handle the payload. */
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guint32 *ptr;
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redirect_entry_t *redirect_info;
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conversation_t *conversation;
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proto_tree *msp_tree;
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proto_item *ti;
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conversation = find_conversation_pinfo(pinfo, 0);
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DISSECTOR_ASSERT( conversation); /* should always find a conversation */
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redirect_info = (redirect_entry_t *)conversation_get_proto_data(conversation,
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proto_msproxy);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MS Proxy");
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col_set_str(pinfo->cinfo, COL_INFO,
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(( redirect_info->ctype == CONVERSATION_TCP) ? "TCP stream" :
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"UDP packets"));
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if ( tree) {
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ti = proto_tree_add_item( tree, proto_msproxy, tvb, 0, 0,
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ENC_NA );
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msp_tree = proto_item_add_subtree(ti, ett_msproxy);
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proto_tree_add_uint( msp_tree, hf_msproxy_dstport, tvb, 0, 0,
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redirect_info->remote_port);
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proto_tree_add_ipv4( msp_tree, hf_msproxy_dstaddr, tvb, 0, 0,
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redirect_info->remote_addr);
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}
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/* set pinfo->{src/dst port} and call the TCP or UDP sub-dissector lookup */
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if ( pinfo->srcport == redirect_info->clnt_port)
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ptr = &pinfo->destport;
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else
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ptr = &pinfo->srcport;
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*ptr = redirect_info->remote_port;
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if ( redirect_info->ctype == CONVERSATION_TCP)
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decode_tcp_ports( tvb, 0, pinfo, tree, pinfo->srcport,
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pinfo->destport, NULL, NULL);
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else
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decode_udp_ports( tvb, 0, pinfo, tree, pinfo->srcport,
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pinfo->destport, -1);
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*ptr = redirect_info->server_int_port;
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return tvb_captured_length(tvb);
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}
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static void add_msproxy_conversation( packet_info *pinfo,
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hash_entry_t *hash_info){
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/* check to see if a conversation already exists, if it does assume */
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/* it's our conversation and quit. Otherwise create a new conversation. */
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/* Load the conversation dissector to our dissector and load the */
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/* conversation data structure with the info needed to call the TCP or */
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/* UDP port decoder. */
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/* NOTE: Currently this assumes that the conversation will be created */
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/* during a packet from the server. If that changes, pinfo->src */
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/* and pinfo->dst will not be correct and this routine will have */
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/* to change. */
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conversation_t *conversation;
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redirect_entry_t *new_conv_info;
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if (pinfo->fd->visited) {
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/*
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* We've already processed this frame once, so we
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* should already have done this.
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*/
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return;
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}
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conversation = find_conversation( pinfo->num, &pinfo->src,
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&pinfo->dst, hash_info->ctype, hash_info->server_int_port,
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hash_info->clnt_port, 0);
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if ( !conversation) {
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conversation = conversation_new( pinfo->num, &pinfo->src, &pinfo->dst,
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hash_info->ctype, hash_info->server_int_port,
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hash_info->clnt_port, 0);
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}
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conversation_set_dissector(conversation, msproxy_sub_handle);
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new_conv_info = wmem_new(wmem_file_scope(), redirect_entry_t);
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new_conv_info->remote_addr = hash_info->dst_addr;
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new_conv_info->clnt_port = hash_info->clnt_port;
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new_conv_info->remote_port = hash_info->dst_port;
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new_conv_info->server_int_port = hash_info->server_int_port;
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new_conv_info->ctype = hash_info->ctype;
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conversation_add_proto_data(conversation, proto_msproxy,
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new_conv_info);
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}
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static int display_application_name(tvbuff_t *tvb, int offset,
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proto_tree *tree) {
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/* display the application name in the proto tree. */
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/* NOTE: this routine assumes that the tree pointer is valid (not NULL) */
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int length;
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length = tvb_strnlen( tvb, offset, 255);
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proto_tree_add_item(tree, hf_msproxy_application, tvb, offset, length, ENC_ASCII);
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return length;
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}
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static const char *get_msproxy_cmd_name( int cmd, int direction) {
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/* return the command name string for cmd */
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switch (cmd){
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case MSPROXY_HELLO_2:
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case MSPROXY_HELLO: return "Hello";
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/* MSPROXY_HELLO_ACK & MSPROXY_USERINFO have the same value (0x1000). */
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/* So use the direction flag to determine which to use. */
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case MSPROXY_USERINFO:
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if ( direction == FROM_SERVER)
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return "Hello Acknowledge";
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else
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return "User Info";
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case MSPROXY_USERINFO_ACK: return "User Info Acknowledge";
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case MSPROXY_AUTH: return "Authentication";
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case MSPROXY_AUTH_1_ACK: return "Authentication Acknowledge";
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case MSPROXY_AUTH_2: return "Authentication 2";
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case MSPROXY_AUTH_2_ACK: return "Authentication 2 Acknowledge";
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case MSPROXY_RESOLVE: return "Resolve";
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case MSPROXY_RESOLVE_ACK: return "Resolve Acknowledge";
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case MSPROXY_BIND: return "Bind";
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case MSPROXY_TCP_BIND: return "TCP Bind";
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case MSPROXY_TCP_BIND_ACK: return "TCP Bind Acknowledge";
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case MSPROXY_LISTEN: return "Listen";
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case MSPROXY_BINDINFO: return "Bind Info";
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case MSPROXY_BINDINFO_ACK: return "Bind Info Acknowledge";
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case MSPROXY_CONNECT: return "Connect";
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case MSPROXY_CONNECT_ACK: return "Connect Acknowledge";
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case MSPROXY_UDPASSOCIATE: return "UDP Associate";
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case MSPROXY_UDP_BIND_REQ: return "UDP Bind";
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case MSPROXY_UDPASSOCIATE_ACK: return "Bind or Associate Acknowledge";
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case MSPROXY_CONNECTED: return "Connected";
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case MSPROXY_SESSIONEND: return "Session End";
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default: return "Unknown";
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}
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}
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static void dissect_user_info_2(tvbuff_t *tvb, int offset,
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proto_tree *tree) {
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/* decode the user, application, computer name */
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int length;
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if ( tree) {
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length = tvb_strnlen( tvb, offset, 255);
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if (length == -1)
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return;
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proto_tree_add_item(tree, hf_msproxy_user_name, tvb, offset, length + 1, ENC_ASCII);
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offset += length + 2;
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length = tvb_strnlen( tvb, offset, 255);
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if (length == -1)
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return;
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proto_tree_add_item(tree, hf_msproxy_application_name, tvb, offset, length + 1, ENC_ASCII);
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offset += length + 1;
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length = tvb_strnlen( tvb, offset, 255);
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if (length == -1)
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return;
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proto_tree_add_item(tree, hf_msproxy_client_computer_name, tvb, offset, length + 1, ENC_ASCII);
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}
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}
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static void dissect_msproxy_request_1(tvbuff_t *tvb, int offset,
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proto_tree *tree) {
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/* decode the request _1 structure */
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offset += 182;
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dissect_user_info_2( tvb, offset, tree);
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}
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static void dissect_bind(tvbuff_t *tvb, int offset,
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proto_tree *tree, hash_entry_t *conv_info) {
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/* decode the bind request */
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offset += 18;
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if ( tree)
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proto_tree_add_item( tree, hf_msproxy_bindaddr, tvb, offset, 4,
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ENC_BIG_ENDIAN);
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offset += 4;
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if ( tree)
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proto_tree_add_item( tree, hf_msproxy_bindport, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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offset += 6;
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if ( tree)
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proto_tree_add_item( tree, hf_msproxy_clntport, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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offset += 2;
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conv_info->clnt_port = tvb_get_ntohs( tvb, offset);
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offset += 6;
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if ( tree){
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proto_tree_add_item( tree, hf_msproxy_boundport, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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offset += 82;
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display_application_name( tvb, offset, tree);
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}
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}
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static int dissect_auth(tvbuff_t *tvb, int offset,
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proto_tree *tree) {
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/* decode the authorization request */
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offset += 134;
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if ( tree) {
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proto_tree_add_item( tree, hf_msproxy_ntlmssp_signature, tvb, offset, 7, ENC_NA|ENC_ASCII);
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}
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offset += 7;
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return offset;
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}
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static void dissect_tcp_bind(tvbuff_t *tvb, int offset,
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proto_tree *tree, hash_entry_t *conv_info) {
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/* decode the bind packet. Set the protocol type in the conversation */
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/* information so the bind_info can use it to create the payload */
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/* dissector. */
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conv_info->ctype = CONVERSATION_TCP;
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if ( tree) {
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offset += 6;
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proto_tree_add_item( tree, hf_msproxy_bind_id, tvb, offset, 4,
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ENC_BIG_ENDIAN);
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offset += 16;
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proto_tree_add_item( tree, hf_msproxy_boundport, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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offset += 96;
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display_application_name( tvb, offset, tree);
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}
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}
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static void dissect_request_connect(tvbuff_t *tvb, int offset,
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proto_tree *tree, hash_entry_t *conv_info) {
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/* decode the connect request, display */
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conv_info->ctype = CONVERSATION_TCP;
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offset += 20;
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if ( tree)
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proto_tree_add_item( tree, hf_msproxy_dstport, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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conv_info->dst_port = tvb_get_ntohs( tvb, offset);
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offset += 2;
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if ( tree)
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proto_tree_add_item( tree, hf_msproxy_dstaddr, tvb, offset, 4,
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ENC_BIG_ENDIAN);
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conv_info->dst_addr = tvb_get_ipv4( tvb, offset);
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offset += 12;
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conv_info->clnt_port = tvb_get_ntohs( tvb, offset);
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if ( tree){
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proto_tree_add_uint( tree, hf_msproxy_clntport, tvb, offset, 2,
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conv_info->clnt_port);
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offset += 84;
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display_application_name( tvb, offset, tree);
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}
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}
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|
static void dissect_bind_info_ack(tvbuff_t *tvb, int offset, proto_tree *tree) {
|
|
|
|
/* decode the client bind info ack */
|
|
|
|
|
|
if ( tree){
|
|
offset += 6;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_bind_id, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 14;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_dstport, tvb, offset, 2,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_dstaddr, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 12;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_int_port, tvb,
|
|
offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_ext_port, tvb,
|
|
offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_ext_addr, tvb,
|
|
offset, 4, ENC_BIG_ENDIAN);
|
|
|
|
offset += 78;
|
|
display_application_name( tvb, offset, tree);
|
|
}
|
|
}
|
|
|
|
|
|
static void dissect_request_resolve(tvbuff_t *tvb, int offset,
|
|
proto_tree *tree, packet_info *pinfo) {
|
|
|
|
/* dissect the request resolve structure */
|
|
/* display a string with a length, characters encoding */
|
|
/* they are displayed under a tree with the name in Label variable */
|
|
/* return the length of the string and the length byte */
|
|
|
|
proto_tree *name_tree;
|
|
|
|
int length = tvb_get_guint8( tvb, offset);
|
|
|
|
if ( tree){
|
|
name_tree = proto_tree_add_subtree_format(tree, tvb, offset, length + 1,
|
|
ett_msproxy_name, NULL, "Host Name: %.*s", length,
|
|
tvb_get_string_enc( pinfo->pool, tvb, offset + 18, length, ENC_ASCII));
|
|
|
|
proto_tree_add_item(name_tree, hf_msproxy_req_resolve_length, tvb, offset, 1, ENC_NA);
|
|
|
|
++offset;
|
|
offset += 17;
|
|
|
|
proto_tree_add_item(name_tree, hf_msproxy_host_name, tvb, offset, length, ENC_ASCII);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void dissect_udp_bind(tvbuff_t *tvb, int offset,
|
|
proto_tree *tree, hash_entry_t *conv_info) {
|
|
|
|
/*
|
|
* Dissect the udp bind request. Load the conversation key type
|
|
* (CONVERSATION_UDP) and the remote address so bind_info
|
|
* can use it to create conversation dissector.
|
|
*/
|
|
|
|
conv_info->ctype = CONVERSATION_UDP;
|
|
|
|
|
|
offset += 8;
|
|
|
|
if ( tree)
|
|
proto_tree_add_item( tree, hf_msproxy_bind_id, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 12;
|
|
|
|
|
|
if ( tree)
|
|
proto_tree_add_item( tree, hf_msproxy_dstport, tvb, offset, 2,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
if ( tree)
|
|
proto_tree_add_item( tree, hf_msproxy_dstaddr, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
|
|
offset += 96;
|
|
|
|
if ( tree)
|
|
display_application_name( tvb, offset, tree);
|
|
}
|
|
|
|
|
|
static void dissect_udp_assoc(tvbuff_t *tvb, int offset,
|
|
proto_tree *tree, hash_entry_t *conv_info) {
|
|
|
|
/* dissect the udp associate request. And load client port into */
|
|
/* conversation data structure for later. */
|
|
|
|
|
|
offset += 28;
|
|
|
|
if ( tree)
|
|
proto_tree_add_item( tree, hf_msproxy_clntport, tvb, offset, 2,
|
|
ENC_BIG_ENDIAN);
|
|
|
|
conv_info->clnt_port = tvb_get_ntohs( tvb, offset);
|
|
|
|
offset += 90;
|
|
|
|
if ( tree)
|
|
display_application_name( tvb, offset, tree);
|
|
}
|
|
|
|
|
|
static void dissect_msproxy_request(tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree, hash_entry_t *conv_info) {
|
|
|
|
int offset = 0;
|
|
int cmd;
|
|
proto_item* cmd_item;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_client_id, tvb, offset, 4, ENC_LITTLE_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_version, tvb, offset, 4, ENC_LITTLE_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_id, tvb, offset, 4, ENC_LITTLE_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_ack, tvb, offset, 1, ENC_LITTLE_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_seq_num, tvb, offset, 1, ENC_LITTLE_ENDIAN);
|
|
offset += 8;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_rwsp_signature, tvb, offset, 4, ENC_NA|ENC_ASCII);
|
|
offset += 12;
|
|
|
|
cmd = tvb_get_ntohs( tvb, offset);
|
|
|
|
cmd_item = proto_tree_add_uint_format_value( tree, hf_msproxy_cmd, tvb, offset, 2,
|
|
cmd, "%s (0x%02x)",
|
|
get_msproxy_cmd_name( cmd, FROM_CLIENT),
|
|
cmd);
|
|
|
|
offset += 2;
|
|
|
|
switch (cmd){
|
|
case MSPROXY_AUTH:
|
|
dissect_auth( tvb, offset, tree);
|
|
break;
|
|
|
|
case MSPROXY_BIND:
|
|
dissect_bind( tvb, offset, tree, conv_info);
|
|
break;
|
|
|
|
case MSPROXY_UDP_BIND_REQ:
|
|
dissect_udp_bind( tvb, offset, tree, conv_info);
|
|
break;
|
|
|
|
case MSPROXY_AUTH_2: /*$$ this is probably wrong place for this */
|
|
case MSPROXY_TCP_BIND:
|
|
dissect_tcp_bind( tvb, offset, tree, conv_info);
|
|
break;
|
|
|
|
case MSPROXY_RESOLVE:
|
|
dissect_request_resolve( tvb, offset, tree, pinfo);
|
|
break;
|
|
|
|
case MSPROXY_CONNECT:
|
|
case MSPROXY_LISTEN:
|
|
dissect_request_connect( tvb, offset, tree,
|
|
conv_info);
|
|
break;
|
|
|
|
case MSPROXY_BINDINFO_ACK:
|
|
dissect_bind_info_ack( tvb, offset, tree);
|
|
break;
|
|
|
|
case MSPROXY_HELLO:
|
|
case MSPROXY_HELLO_2:
|
|
dissect_msproxy_request_1( tvb, offset, tree);
|
|
break;
|
|
|
|
case MSPROXY_UDPASSOCIATE:
|
|
dissect_udp_assoc( tvb, offset, tree, conv_info);
|
|
break;
|
|
default:
|
|
expert_add_info_format(pinfo, cmd_item, &ei_msproxy_unhandled,
|
|
"Unhandled request command (report this, please)");
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static int dissect_hello_ack(tvbuff_t *tvb, int offset, proto_tree *tree) {
|
|
|
|
/* decode the hello acknowledge packet */
|
|
|
|
offset += 60;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_serverport, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
proto_tree_add_item( tree, hf_msproxy_serveraddr, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
|
|
/* XXX - implement me */
|
|
static int dissect_user_info_ack(tvbuff_t *tvb _U_, int offset,
|
|
proto_tree *tree _U_) {
|
|
|
|
/* decode the response _2 structure */
|
|
|
|
offset += 18;
|
|
|
|
offset += 2;
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
|
|
static void dissect_udpassociate_ack(tvbuff_t *tvb, int offset,
|
|
proto_tree *tree) {
|
|
|
|
offset += 6;
|
|
|
|
if ( tree) {
|
|
proto_tree_add_item( tree, hf_msproxy_bind_id, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 14;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_ext_port, tvb,
|
|
offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_ext_addr, tvb,
|
|
offset, 4, ENC_BIG_ENDIAN);
|
|
|
|
offset += 96;
|
|
display_application_name( tvb, offset, tree);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void dissect_auth_1_ack(tvbuff_t *tvb, int offset,
|
|
proto_tree *tree) {
|
|
|
|
offset += 134;
|
|
if ( tree) {
|
|
proto_tree_add_item( tree, hf_msproxy_ntlmssp_signature, tvb, offset, 7, ENC_NA|ENC_ASCII);
|
|
offset += 48;
|
|
|
|
/* XXX - always 255? */
|
|
proto_tree_add_item(tree, hf_msproxy_nt_domain, tvb, offset, 255, ENC_ASCII);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/* XXX - implement me */
|
|
static int dissect_msproxy_response_4( tvbuff_t *tvb _U_, int offset,
|
|
proto_tree *tree _U_) {
|
|
|
|
/* decode the response _4 structure */
|
|
|
|
offset += 134;
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
|
|
static void dissect_connect_ack( tvbuff_t *tvb, int offset, packet_info *pinfo,
|
|
proto_tree *tree, hash_entry_t *conv_info) {
|
|
|
|
/* decode the connect ack packet */
|
|
offset += 20;
|
|
|
|
if ( tree)
|
|
proto_tree_add_item( tree, hf_msproxy_server_int_port, tvb,
|
|
offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
|
|
conv_info->ctype = CONVERSATION_TCP;
|
|
conv_info->server_int_port = tvb_get_ntohs( tvb, offset);
|
|
offset += 2;
|
|
|
|
if ( tree){
|
|
proto_tree_add_item( tree, hf_msproxy_server_int_addr, tvb,
|
|
offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 14;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_ext_port, tvb,
|
|
offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_ext_addr, tvb,
|
|
offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 80;
|
|
|
|
display_application_name( tvb, offset, tree);
|
|
}
|
|
|
|
add_msproxy_conversation( pinfo, conv_info);
|
|
}
|
|
|
|
|
|
|
|
static void dissect_tcp_bind_ack( tvbuff_t *tvb, int offset, proto_tree *tree) {
|
|
|
|
/* decode the tcp bind */
|
|
|
|
if ( tree) {
|
|
offset += 6;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_bind_id, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 16;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_int_port, tvb,
|
|
offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 6;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_ext_port, tvb,
|
|
offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_ext_addr, tvb,
|
|
offset, 4, ENC_BIG_ENDIAN);
|
|
|
|
offset += 88;
|
|
|
|
display_application_name( tvb, offset, tree);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void dissect_bind_info( tvbuff_t *tvb, int offset, packet_info *pinfo,
|
|
proto_tree *tree, hash_entry_t *conv_info) {
|
|
|
|
/* decode the Bind info response from server */
|
|
|
|
offset += 6;
|
|
|
|
if ( tree)
|
|
proto_tree_add_item( tree, hf_msproxy_bind_id, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 14;
|
|
|
|
|
|
conv_info->dst_port = tvb_get_ntohs( tvb, offset);
|
|
if ( tree)
|
|
proto_tree_add_uint( tree, hf_msproxy_dstport, tvb, offset, 2,
|
|
conv_info->dst_port);
|
|
offset += 2;
|
|
|
|
conv_info->dst_addr = tvb_get_ipv4( tvb, offset);
|
|
if ( tree)
|
|
proto_tree_add_item( tree, hf_msproxy_dstaddr, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 12;
|
|
|
|
conv_info->server_int_port = tvb_get_ntohs( tvb, offset);
|
|
if ( tree)
|
|
proto_tree_add_uint( tree, hf_msproxy_server_int_port, tvb,
|
|
offset, 2, conv_info->server_int_port);
|
|
offset += 4;
|
|
|
|
if ( tree) {
|
|
proto_tree_add_item( tree, hf_msproxy_server_ext_port, tvb,
|
|
offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_ext_addr, tvb,
|
|
offset, 4, ENC_BIG_ENDIAN);
|
|
|
|
offset += 78;
|
|
display_application_name( tvb, offset, tree);
|
|
|
|
}
|
|
|
|
add_msproxy_conversation( pinfo, conv_info);
|
|
}
|
|
|
|
|
|
|
|
static void dissect_resolve(tvbuff_t *tvb, int offset, proto_tree *tree) {
|
|
|
|
/* dissect the response resolve structure */
|
|
/* display a string with a length, characters encoding */
|
|
/* they are displayed under a tree with the name in Label variable */
|
|
/* return the length of the string and the length byte */
|
|
|
|
if ( tree) {
|
|
int addr_offset;
|
|
|
|
addr_offset = tvb_get_guint8( tvb, offset);
|
|
|
|
proto_tree_add_item(tree, hf_msproxy_address_offset, tvb, offset, 1, ENC_NA);
|
|
|
|
++offset;
|
|
|
|
offset += 13;
|
|
|
|
offset += addr_offset;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_resolvaddr, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void dissect_msproxy_response(tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree, hash_entry_t *conv_info) {
|
|
|
|
int offset = 0;
|
|
int cmd;
|
|
proto_item* ti;
|
|
|
|
if ( tree) {
|
|
proto_tree_add_item( tree, hf_msproxy_client_id, tvb, offset, 4, ENC_LITTLE_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_version, tvb, offset, 4, ENC_LITTLE_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_server_id, tvb, offset, 4, ENC_LITTLE_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_client_ack, tvb, offset, 1, ENC_LITTLE_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_seq_num, tvb, offset, 1, ENC_LITTLE_ENDIAN);
|
|
offset += 8;
|
|
|
|
proto_tree_add_item( tree, hf_msproxy_rwsp_signature, tvb, offset, 4, ENC_NA|ENC_ASCII);
|
|
offset += 12;
|
|
}
|
|
else
|
|
offset += 36;
|
|
|
|
cmd = tvb_get_ntohs( tvb, offset);
|
|
|
|
ti = proto_tree_add_uint_format_value( tree, hf_msproxy_cmd, tvb, offset, 2,
|
|
cmd, "0x%02x (%s)", cmd,
|
|
get_msproxy_cmd_name( cmd, FROM_SERVER));
|
|
offset += 2;
|
|
|
|
switch (cmd) {
|
|
case MSPROXY_HELLO_ACK:
|
|
dissect_hello_ack( tvb, offset, tree);
|
|
break;
|
|
|
|
case MSPROXY_USERINFO_ACK:
|
|
dissect_user_info_ack( tvb, offset, tree);
|
|
break;
|
|
|
|
case MSPROXY_AUTH_1_ACK:
|
|
dissect_auth_1_ack( tvb, offset, tree);
|
|
break;
|
|
|
|
/* this also handle the MSPROXY_BIND_ACK ??? check this */
|
|
|
|
case MSPROXY_UDPASSOCIATE_ACK:
|
|
dissect_udpassociate_ack( tvb, offset, tree);
|
|
break;
|
|
|
|
case MSPROXY_AUTH_2_ACK:
|
|
case MSPROXY_AUTH_2_ACK2:
|
|
dissect_msproxy_response_4( tvb, offset, tree);
|
|
break;
|
|
|
|
case MSPROXY_TCP_BIND_ACK:
|
|
dissect_tcp_bind_ack( tvb, offset, tree);
|
|
break;
|
|
|
|
case MSPROXY_CONNECT_ACK:
|
|
dissect_connect_ack( tvb, offset, pinfo, tree,
|
|
conv_info);
|
|
break;
|
|
|
|
case MSPROXY_BINDINFO:
|
|
dissect_bind_info( tvb, offset, pinfo, tree, conv_info);
|
|
break;
|
|
|
|
case MSPROXY_RESOLVE_ACK:
|
|
dissect_resolve( tvb, offset, tree);
|
|
break;
|
|
|
|
case MSPROXY_CONNECT_AUTHFAILED:
|
|
case MSPROXY_BIND_AUTHFAILED:
|
|
expert_add_info(pinfo, ti, &ei_msproxy_unknown);
|
|
break;
|
|
|
|
default:
|
|
|
|
if ((((cmd >> 8) == MSPROXY_CONNREFUSED) ||
|
|
((cmd >> 12) == MSPROXY_CONNREFUSED)))
|
|
expert_add_info(pinfo, ti, &ei_msproxy_unknown);
|
|
else
|
|
expert_add_info(pinfo, ti, &ei_msproxy_unhandled);
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
static int dissect_msproxy(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) {
|
|
|
|
proto_tree *msproxy_tree;
|
|
proto_item *ti;
|
|
unsigned int cmd;
|
|
|
|
|
|
hash_entry_t *hash_info;
|
|
conversation_t *conversation;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MSproxy");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
conversation = find_or_create_conversation(pinfo);
|
|
|
|
hash_info = (hash_entry_t *)conversation_get_proto_data(conversation, proto_msproxy);
|
|
if ( !hash_info) {
|
|
hash_info = wmem_new0(wmem_file_scope(), hash_entry_t);
|
|
conversation_add_proto_data(conversation, proto_msproxy,
|
|
hash_info);
|
|
}
|
|
|
|
cmd = tvb_get_ntohs( tvb, 36);
|
|
|
|
if ( pinfo->srcport == UDP_PORT_MSPROXY)
|
|
col_add_fstr( pinfo->cinfo, COL_INFO, "Server message: %s",
|
|
get_msproxy_cmd_name( cmd, FROM_SERVER));
|
|
else
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "Client message: %s",
|
|
get_msproxy_cmd_name( cmd, FROM_CLIENT));
|
|
|
|
ti = proto_tree_add_item( tree, proto_msproxy, tvb, 0, -1, ENC_NA );
|
|
msproxy_tree = proto_item_add_subtree(ti, ett_msproxy);
|
|
|
|
if ( pinfo->srcport == UDP_PORT_MSPROXY)
|
|
dissect_msproxy_response( tvb, pinfo, msproxy_tree, hash_info);
|
|
else
|
|
dissect_msproxy_request( tvb, pinfo, msproxy_tree, hash_info);
|
|
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
|
|
void
|
|
proto_register_msproxy( void){
|
|
|
|
/* Prep the msproxy protocol, for now, just register it */
|
|
|
|
static gint *ett[] = {
|
|
&ett_msproxy,
|
|
&ett_msproxy_name
|
|
};
|
|
static hf_register_info hf[] = {
|
|
|
|
{ &hf_msproxy_cmd,
|
|
{ "Command", "msproxy.command", FT_UINT16, BASE_DEC,
|
|
NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
|
|
{ &hf_msproxy_dstaddr,
|
|
{ "Destination Address", "msproxy.dstaddr", FT_IPv4, BASE_NONE, NULL,
|
|
0x0, NULL, HFILL
|
|
}
|
|
},
|
|
|
|
#if 0
|
|
{ &hf_msproxy_srcport,
|
|
{ "Source Port", "msproxy.srcport", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
#endif
|
|
{ &hf_msproxy_dstport,
|
|
{ "Destination Port", "msproxy.dstport", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_clntport,
|
|
{ "Client Port", "msproxy.clntport", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_server_ext_addr,
|
|
{ "Server External Address", "msproxy.server_ext_addr", FT_IPv4, BASE_NONE, NULL,
|
|
0x0, NULL, HFILL
|
|
}
|
|
},
|
|
|
|
{ &hf_msproxy_server_ext_port,
|
|
{ "Server External Port", "msproxy.server_ext_port", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
|
|
{ &hf_msproxy_server_int_addr,
|
|
{ "Server Internal Address", "msproxy.server_int_addr", FT_IPv4, BASE_NONE, NULL,
|
|
0x0, NULL, HFILL
|
|
}
|
|
},
|
|
|
|
{ &hf_msproxy_server_int_port,
|
|
{ "Server Internal Port", "msproxy.server_int_port", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_serverport,
|
|
{ "Server Port", "msproxy.serverport", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_bindport,
|
|
{ "Bind Port", "msproxy.bindport", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_boundport,
|
|
{ "Bound Port", "msproxy.boundport", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_serveraddr,
|
|
{ "Server Address", "msproxy.serveraddr", FT_IPv4, BASE_NONE, NULL,
|
|
0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_bindaddr,
|
|
{ "Destination", "msproxy.bindaddr", FT_IPv4, BASE_NONE, NULL,
|
|
0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_bind_id,
|
|
{ "Bound Port Id", "msproxy.bindid", FT_UINT32,
|
|
BASE_HEX, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_resolvaddr,
|
|
{ "Address", "msproxy.resolvaddr", FT_IPv4, BASE_NONE, NULL,
|
|
0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_client_id,
|
|
{ "Client Id", "msproxy.client_id", FT_UINT32,
|
|
BASE_HEX, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_version,
|
|
{ "Version", "msproxy.version", FT_UINT32,
|
|
BASE_HEX, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_server_id,
|
|
{ "Server id", "msproxy.server_id", FT_UINT32,
|
|
BASE_HEX, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_server_ack,
|
|
{ "Server ack", "msproxy.server_ack", FT_UINT8,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_client_ack,
|
|
{ "Client ack", "msproxy.client_ack", FT_UINT8,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_seq_num,
|
|
{ "Sequence Number", "msproxy.seq_num", FT_UINT8,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_rwsp_signature,
|
|
{ "RWSP signature", "msproxy.rwsp_signature", FT_STRING, BASE_NONE, NULL,
|
|
0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_msproxy_ntlmssp_signature,
|
|
{ "NTLMSSP signature", "msproxy.ntlmssp_signature", FT_STRING, BASE_NONE, NULL,
|
|
0x0, NULL, HFILL
|
|
}
|
|
},
|
|
|
|
/* Generated from convert_proto_tree_add_text.pl */
|
|
{ &hf_msproxy_application, { "Application", "msproxy.application", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_msproxy_user_name, { "User name", "msproxy.user_name", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_msproxy_application_name, { "Application name", "msproxy.application_name", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_msproxy_client_computer_name, { "Client computer name", "msproxy.client_computer_name", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_msproxy_req_resolve_length, { "Length", "msproxy.req_resolve.length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_msproxy_host_name, { "Host Name", "msproxy.host_name", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_msproxy_nt_domain, { "NT domain", "msproxy.nt_domain", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_msproxy_address_offset, { "Address offset", "msproxy.address_offset", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_msproxy_unknown,
|
|
{ "msproxy.unknown", PI_UNDECODED, PI_WARN, "No know information (help wanted)", EXPFILL }},
|
|
{ &ei_msproxy_unhandled,
|
|
{ "msproxy.command.unhandled", PI_UNDECODED, PI_WARN, "Unhandled response command (report this, please)", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_msproxy;
|
|
|
|
proto_msproxy = proto_register_protocol( "MS Proxy Protocol", "MS Proxy", "msproxy");
|
|
|
|
proto_register_field_array(proto_msproxy, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_msproxy = expert_register_protocol(proto_msproxy);
|
|
expert_register_field_array(expert_msproxy, ei, array_length(ei));
|
|
|
|
msproxy_sub_handle = create_dissector_handle(msproxy_sub_dissector,
|
|
proto_msproxy);
|
|
}
|
|
|
|
|
|
void
|
|
proto_reg_handoff_msproxy(void) {
|
|
|
|
/* dissector install routine */
|
|
|
|
dissector_handle_t msproxy_handle;
|
|
|
|
msproxy_handle = create_dissector_handle(dissect_msproxy, proto_msproxy);
|
|
dissector_add_uint_with_preference("udp.port", UDP_PORT_MSPROXY, msproxy_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|