epan/dissectors/packet-kpasswd.c

   1 /* packet-kpasswd.c
   2  * Routines for kpasswd packet dissection
   3  *    Ronnie Sahlberg 2003
   4  *
   5  * See RFC 3244
   6  *
   7  * $Id$
   8  *
   9  * Ethereal - Network traffic analyzer
  10  * By Gerald Combs <gerald@ethereal.com>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <epan/packet.h>
  33 #include "packet-kerberos.h"
  34 #include <epan/prefs.h>
  35
  36 static int proto_kpasswd = -1;
  37 static int hf_kpasswd_message_len = -1;
  38 static int hf_kpasswd_version = -1;
  39 static int hf_kpasswd_ap_req_len = -1;
  40 static int hf_kpasswd_ap_req_data = -1;
  41 static int hf_kpasswd_krb_priv_message = -1;
  42
  43 static gint ett_kpasswd = -1;
  44 static gint ett_ap_req_data = -1;
  45 static gint ett_krb_priv_message = -1;
  46
  47
  48
  49 #define UDP_PORT_KPASSWD                464
  50
  51
  52 static const value_string vers_vals[] = {
  53         { 0x0001,       "Reply" },
  54         { 0xff80,       "Request" },
  55         { 0,    NULL },
  56 };
  57
  58
  59 static void
  60 dissect_kpasswd_ap_req_data(packet_info *pinfo _U_, tvbuff_t *tvb, proto_tree *parent_tree)
  61 {
  62         proto_item *it;
  63         proto_tree *tree=NULL;
  64
  65         if(parent_tree){
  66                 it=proto_tree_add_item(parent_tree, hf_kpasswd_ap_req_data, tvb, 0, -1, FALSE);
  67                 tree=proto_item_add_subtree(it, ett_ap_req_data);
  68         }
  69         dissect_kerberos_main(tvb, pinfo, tree, FALSE, NULL);
  70 }
  71
  72 static void
  73 dissect_kpasswd_krb_priv_message(packet_info *pinfo _U_, tvbuff_t *tvb, proto_tree *parent_tree)
  74 {
  75         proto_item *it;
  76         proto_tree *tree=NULL;
  77
  78         if(parent_tree){
  79                 it=proto_tree_add_item(parent_tree, hf_kpasswd_krb_priv_message, tvb, 0, -1, FALSE);
  80                 tree=proto_item_add_subtree(it, ett_krb_priv_message);
  81         }
  82         dissect_kerberos_main(tvb, pinfo, tree, FALSE, NULL);
  83 }
  84
  85
  86 static void
  87 dissect_kpasswd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  88 {
  89         proto_item *kpasswd_item;
  90         proto_tree *kpasswd_tree=NULL;
  91         int offset = 0;
  92         guint16 message_len, version, ap_req_len;
  93         tvbuff_t *next_tvb;
  94
  95         if (check_col(pinfo->cinfo, COL_PROTOCOL))
  96                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "KPASSWD");
  97         if (check_col(pinfo->cinfo, COL_INFO))
  98                 col_clear(pinfo->cinfo, COL_INFO);
  99
 100         message_len=tvb_get_ntohs(tvb, offset);
 101         version=tvb_get_ntohs(tvb, offset+2);
 102         ap_req_len=tvb_get_ntohs(tvb, offset+4);
 103         if(tree){
 104                 kpasswd_item=proto_tree_add_item(tree, proto_kpasswd, tvb, offset, message_len, FALSE);
 105                 kpasswd_tree=proto_item_add_subtree(kpasswd_item, ett_kpasswd);
 106         }
 107
 108         proto_tree_add_uint(kpasswd_tree, hf_kpasswd_message_len, tvb, offset, 2, message_len);
 109         proto_tree_add_uint(kpasswd_tree, hf_kpasswd_version, tvb, offset+2, 2, version);
 110         if (check_col(pinfo->cinfo, COL_INFO))
 111                 col_set_str(pinfo->cinfo, COL_INFO, val_to_str(version, vers_vals, "Unknown command"));
 112         proto_tree_add_uint(kpasswd_tree, hf_kpasswd_ap_req_len, tvb, offset+4, 2, ap_req_len);
 113         offset+=6;
 114
 115         /* AP_REQ data */
 116         next_tvb=tvb_new_subset(tvb, offset, ap_req_len, ap_req_len);
 117         dissect_kpasswd_ap_req_data(pinfo, next_tvb, kpasswd_tree);
 118         offset+=ap_req_len;
 119
 120         /* KRB-PRIB message */
 121         next_tvb=tvb_new_subset(tvb, offset, -1, -1);
 122         dissect_kpasswd_krb_priv_message(pinfo, next_tvb, kpasswd_tree);
 123
 124 }
 125
 126
 127 void
 128 proto_register_kpasswd(void)
 129 {
 130         static hf_register_info hf[] = {
 131         { &hf_kpasswd_message_len,
 132                 { "Message Length", "kpasswd.message_len", FT_UINT16, BASE_DEC,
 133                 NULL, 0, "Message Length", HFILL }},
 134         { &hf_kpasswd_ap_req_len,
 135                 { "AP_REQ Length", "kpasswd.ap_req_len", FT_UINT16, BASE_DEC,
 136                 NULL, 0, "Length of AP_REQ data", HFILL }},
 137         { &hf_kpasswd_version,
 138                 { "Version", "kpasswd.version", FT_UINT16, BASE_HEX,
 139                 VALS(vers_vals), 0, "Version", HFILL }},
 140         { &hf_kpasswd_ap_req_data,
 141                 { "AP_REQ", "kpasswd.ap_req", FT_NONE, BASE_NONE,
 142                 NULL, 0, "AP_REQ structure", HFILL }},
 143         { &hf_kpasswd_krb_priv_message,
 144                 { "KRB-PRIV", "kpasswd.krb_priv", FT_NONE, BASE_NONE,
 145                 NULL, 0, "KRB-PRIV message", HFILL }},
 146         };
 147
 148         static gint *ett[] = {
 149                 &ett_kpasswd,
 150                 &ett_ap_req_data,
 151                 &ett_krb_priv_message,
 152         };
 153
 154         proto_kpasswd = proto_register_protocol("MS Kpasswd",
 155                 "Kpasswd", "kpasswd");
 156         proto_register_field_array(proto_kpasswd, hf, array_length(hf));
 157         proto_register_subtree_array(ett, array_length(ett));
 158 }
 159
 160 void
 161 proto_reg_handoff_kpasswd(void)
 162 {
 163         dissector_handle_t kpasswd_handle;
 164
 165         kpasswd_handle = create_dissector_handle(dissect_kpasswd, proto_kpasswd);
 166         dissector_add("udp.port", UDP_PORT_KPASSWD, kpasswd_handle);
 167 }