470 lines
13 KiB
C
470 lines
13 KiB
C
/* packet-kerberos4.c
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* Routines for Kerberos v4 packet dissection
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*
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* Ronnie Sahlberg 2004
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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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* PDU structure based on the document:
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*
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* Athena Technical Plan
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* Section E.2.1
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* Kerberos Authentication and Authorization System
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* by S. P. Miller, B. C. Neuman, J. I. Schiller, and J. H. Saltzer
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*
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* http://web.mit.edu/Saltzer/www/publications/athenaplan/e.2.1.pdf
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*
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* 7. Appendix I Design Specifications
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*/
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#include "config.h"
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#include <epan/packet.h>
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void proto_register_krb4(void);
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void proto_reg_handoff_krb4(void);
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static int proto_krb4 = -1;
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static int hf_krb4_version = -1;
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static int hf_krb4_auth_msg_type = -1;
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static int hf_krb4_m_type = -1;
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static int hf_krb4_byte_order = -1;
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static int hf_krb4_name = -1;
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static int hf_krb4_instance = -1;
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static int hf_krb4_realm = -1;
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static int hf_krb4_time_sec = -1;
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static int hf_krb4_exp_date = -1;
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static int hf_krb4_req_date = -1;
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static int hf_krb4_lifetime = -1;
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static int hf_krb4_s_name = -1;
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static int hf_krb4_s_instance = -1;
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static int hf_krb4_kvno = -1;
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static int hf_krb4_length = -1;
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static int hf_krb4_ticket_length = -1;
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static int hf_krb4_request_length = -1;
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static int hf_krb4_ticket_blob = -1;
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static int hf_krb4_request_blob = -1;
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static int hf_krb4_encrypted_blob = -1;
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static int hf_krb4_unknown_transarc_blob = -1;
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static gint ett_krb4 = -1;
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static gint ett_krb4_auth_msg_type = -1;
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static dissector_handle_t krb4_handle;
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#define UDP_PORT_KRB4 750
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#define TRANSARC_SPECIAL_VERSION 0x63
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static const value_string byte_order_vals[] = {
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{ 0, "Big Endian" },
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{ 1, "Little Endian" },
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{ 0, NULL }
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};
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#define AUTH_MSG_KDC_REQUEST 1
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#define AUTH_MSG_KDC_REPLY 2
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#define AUTH_MSG_APPL_REQUEST 3
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#define AUTH_MSG_APPL_REQUEST_MUTUAL 4
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#define AUTH_MSG_ERR_REPLY 5
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#define AUTH_MSG_PRIVATE 6
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#define AUTH_MSG_SAFE 7
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#define AUTH_MSG_APPL_ERR 8
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#define AUTH_MSG_DIE 63
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static const value_string m_type_vals[] = {
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{ AUTH_MSG_KDC_REQUEST, "KDC Request" },
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{ AUTH_MSG_KDC_REPLY, "KDC Reply" },
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{ AUTH_MSG_APPL_REQUEST, "Appl Request" },
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{ AUTH_MSG_APPL_REQUEST_MUTUAL, "Appl Request Mutual" },
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{ AUTH_MSG_ERR_REPLY, "Err Reply" },
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{ AUTH_MSG_PRIVATE, "Private" },
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{ AUTH_MSG_SAFE, "Safe" },
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{ AUTH_MSG_APPL_ERR, "Appl Err" },
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{ AUTH_MSG_DIE, "Die" },
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{ 0, NULL }
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};
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static int
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dissect_krb4_string(packet_info *pinfo _U_, int hf_index, proto_tree *tree, tvbuff_t *tvb, int offset)
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{
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gint length;
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proto_tree_add_item_ret_length(tree, hf_index, tvb, offset, -1, ENC_ASCII|ENC_NA, &length);
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return offset + length;
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}
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static int
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dissect_krb4_kdc_request(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, const guint encoding, int version)
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{
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nstime_t time_sec;
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guint8 lifetime;
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if(version==TRANSARC_SPECIAL_VERSION){
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proto_tree_add_item(tree, hf_krb4_unknown_transarc_blob, tvb, offset, 8, ENC_NA);
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offset+=8;
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}
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/* Name */
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offset=dissect_krb4_string(pinfo, hf_krb4_name, tree, tvb, offset);
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/* Instance */
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offset=dissect_krb4_string(pinfo, hf_krb4_instance, tree, tvb, offset);
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/* Realm */
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offset=dissect_krb4_string(pinfo, hf_krb4_realm, tree, tvb, offset);
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/* Time sec */
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time_sec.secs=tvb_get_guint32(tvb, offset, encoding);
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time_sec.nsecs=0;
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proto_tree_add_time(tree, hf_krb4_time_sec, tvb, offset, 4, &time_sec);
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offset+=4;
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/* lifetime */
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lifetime=tvb_get_guint8(tvb, offset);
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proto_tree_add_uint_format_value(tree, hf_krb4_lifetime, tvb, offset, 1, lifetime, "%d (%d minutes)", lifetime, lifetime*5);
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offset++;
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/* service Name */
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offset=dissect_krb4_string(pinfo, hf_krb4_s_name, tree, tvb, offset);
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/* service Instance */
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offset=dissect_krb4_string(pinfo, hf_krb4_s_instance, tree, tvb, offset);
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return offset;
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}
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static int
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dissect_krb4_kdc_reply(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, const guint encoding)
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{
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nstime_t time_sec;
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guint32 length;
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/* Name */
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offset=dissect_krb4_string(pinfo, hf_krb4_name, tree, tvb, offset);
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/* Instance */
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offset=dissect_krb4_string(pinfo, hf_krb4_instance, tree, tvb, offset);
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/* Realm */
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offset=dissect_krb4_string(pinfo, hf_krb4_realm, tree, tvb, offset);
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/* Time sec */
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time_sec.secs=tvb_get_guint32(tvb, offset, encoding);
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time_sec.nsecs=0;
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proto_tree_add_time(tree, hf_krb4_time_sec, tvb, offset, 4, &time_sec);
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offset+=4;
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/*XXX unknown byte here */
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offset++;
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/* exp date */
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time_sec.secs=tvb_get_guint32(tvb, offset, encoding);
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time_sec.nsecs=0;
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proto_tree_add_time(tree, hf_krb4_exp_date, tvb, offset, 4, &time_sec);
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offset+=4;
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/* kvno */
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proto_tree_add_item(tree, hf_krb4_kvno, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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/* length2 */
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proto_tree_add_item_ret_uint(tree, hf_krb4_length, tvb, offset, 2, encoding, &length);
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offset+=2;
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/* encrypted blob */
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proto_tree_add_item(tree, hf_krb4_encrypted_blob, tvb, offset, length, ENC_NA);
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offset+=length;
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return offset;
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}
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static int
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dissect_krb4_appl_request(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, const guint encoding)
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{
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guint8 tlen, rlen;
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nstime_t time_sec;
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guint8 lifetime;
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/* kvno */
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proto_tree_add_item(tree, hf_krb4_kvno, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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/* Realm */
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offset=dissect_krb4_string(pinfo, hf_krb4_realm, tree, tvb, offset);
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/* ticket length */
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tlen=tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, hf_krb4_ticket_length, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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/* request length */
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rlen=tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, hf_krb4_request_length, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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/* ticket */
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proto_tree_add_item(tree, hf_krb4_ticket_blob, tvb, offset, tlen, ENC_NA);
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offset+=tlen;
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/* request */
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proto_tree_add_item(tree, hf_krb4_request_blob, tvb, offset, rlen, ENC_NA);
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offset+=rlen;
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/* request time */
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time_sec.secs=tvb_get_guint32(tvb, offset, encoding);
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time_sec.nsecs=0;
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proto_tree_add_time(tree, hf_krb4_req_date, tvb, offset, 4, &time_sec);
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offset+=4;
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/* lifetime */
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lifetime=tvb_get_guint8(tvb, offset);
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proto_tree_add_uint_format_value(tree, hf_krb4_lifetime, tvb, offset, 1, lifetime, "%d (%d minutes)", lifetime, lifetime*5);
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offset++;
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/* service Name */
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offset=dissect_krb4_string(pinfo, hf_krb4_s_name, tree, tvb, offset);
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/* service Instance */
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offset=dissect_krb4_string(pinfo, hf_krb4_s_instance, tree, tvb, offset);
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return offset;
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}
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static int
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dissect_krb4_auth_msg_type(packet_info *pinfo, proto_tree *parent_tree, tvbuff_t *tvb, int offset, int version)
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{
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proto_tree *tree;
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proto_item *item;
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guint8 auth_msg_type;
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auth_msg_type=tvb_get_guint8(tvb, offset);
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item = proto_tree_add_item(parent_tree, hf_krb4_auth_msg_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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tree = proto_item_add_subtree(item, ett_krb4_auth_msg_type);
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/* m_type */
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proto_tree_add_item(tree, hf_krb4_m_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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col_append_fstr(pinfo->cinfo, COL_INFO, "%s%s",
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(version==TRANSARC_SPECIAL_VERSION)?"TRANSARC-":"",
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val_to_str(auth_msg_type>>1, m_type_vals, "Unknown (0x%04x)"));
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proto_item_append_text(item, " %s%s",
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(version==TRANSARC_SPECIAL_VERSION)?"TRANSARC-":"",
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val_to_str(auth_msg_type>>1, m_type_vals, "Unknown (0x%04x)"));
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/* byte order */
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proto_tree_add_item(tree, hf_krb4_byte_order, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_item_append_text(item, " (%s)", val_to_str(auth_msg_type&0x01, byte_order_vals, "Unknown (0x%04x)"));
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offset++;
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return offset;
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}
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static gboolean
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dissect_krb4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data _U_)
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{
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proto_tree *tree;
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proto_item *item;
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guint8 version, opcode;
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int offset = 0;
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guint encoding;
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/* this should better have the value 4 or it might be a weirdo
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* Transarc AFS special unknown thing.
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*/
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version=tvb_get_guint8(tvb, offset);
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if((version!=4)&&(version!=TRANSARC_SPECIAL_VERSION)){
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return FALSE;
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}
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opcode=tvb_get_guint8(tvb, offset+1);
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switch(opcode>>1){
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case AUTH_MSG_KDC_REQUEST:
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case AUTH_MSG_KDC_REPLY:
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case AUTH_MSG_APPL_REQUEST:
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case AUTH_MSG_APPL_REQUEST_MUTUAL:
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case AUTH_MSG_ERR_REPLY:
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case AUTH_MSG_PRIVATE:
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case AUTH_MSG_SAFE:
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case AUTH_MSG_APPL_ERR:
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case AUTH_MSG_DIE:
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break;
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default:
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return FALSE;
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}
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/* create a tree for krb4 */
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item = proto_tree_add_item(parent_tree, proto_krb4, tvb, offset, -1, ENC_NA);
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tree = proto_item_add_subtree(item, ett_krb4);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "KRB4");
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col_clear(pinfo->cinfo, COL_INFO);
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/* version */
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proto_tree_add_item(tree, hf_krb4_version, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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/* auth_msg_type */
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offset = dissect_krb4_auth_msg_type(pinfo, tree, tvb, offset, version);
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encoding = opcode&0x01 ? ENC_LITTLE_ENDIAN : ENC_BIG_ENDIAN;
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switch(opcode>>1){
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case AUTH_MSG_KDC_REQUEST:
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dissect_krb4_kdc_request(pinfo, tree, tvb, offset, encoding, version);
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break;
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case AUTH_MSG_KDC_REPLY:
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dissect_krb4_kdc_reply(pinfo, tree, tvb, offset, encoding);
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break;
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case AUTH_MSG_APPL_REQUEST:
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dissect_krb4_appl_request(pinfo, tree, tvb, offset, encoding);
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break;
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case AUTH_MSG_APPL_REQUEST_MUTUAL:
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case AUTH_MSG_ERR_REPLY:
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case AUTH_MSG_PRIVATE:
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case AUTH_MSG_SAFE:
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case AUTH_MSG_APPL_ERR:
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case AUTH_MSG_DIE:
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break;
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}
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return TRUE;
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}
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void
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proto_register_krb4(void)
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{
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static hf_register_info hf[] = {
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{ &hf_krb4_version,
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{ "Version", "krb4.version",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Kerberos(v4) version number", HFILL }},
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{ &hf_krb4_auth_msg_type,
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{ "Msg Type", "krb4.auth_msg_type",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"Message Type/Byte Order", HFILL }},
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{ &hf_krb4_m_type,
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{ "M Type", "krb4.m_type",
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FT_UINT8, BASE_HEX, VALS(m_type_vals), 0xfe,
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"Message Type", HFILL }},
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{ &hf_krb4_byte_order,
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{ "Byte Order", "krb4.byte_order",
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FT_UINT8, BASE_HEX, VALS(byte_order_vals), 0x01,
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NULL, HFILL }},
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{ &hf_krb4_name,
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{ "Name", "krb4.name",
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FT_STRINGZ, BASE_NONE, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_instance,
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{ "Instance", "krb4.instance",
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FT_STRINGZ, BASE_NONE, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_realm,
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{ "Realm", "krb4.realm",
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FT_STRINGZ, BASE_NONE, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_time_sec,
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{ "Time Sec", "krb4.time_sec",
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FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_exp_date,
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{ "Exp Date", "krb4.exp_date",
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FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_req_date,
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{ "Req Date", "krb4.req_date",
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FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_lifetime,
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{ "Lifetime", "krb4.lifetime",
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FT_UINT8, BASE_DEC, NULL, 0x00,
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"Lifetime (in 5 min units)", HFILL }},
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{ &hf_krb4_s_name,
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{ "Service Name", "krb4.s_name",
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FT_STRINGZ, BASE_NONE, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_s_instance,
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{ "Service Instance", "krb4.s_instance",
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FT_STRINGZ, BASE_NONE, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_kvno,
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{ "Kvno", "krb4.kvno",
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FT_UINT8, BASE_DEC, NULL, 0x00,
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"Key Version No", HFILL }},
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{ &hf_krb4_length,
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{ "Length", "krb4.length",
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FT_UINT32, BASE_DEC, NULL, 0x00,
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"Length of encrypted blob", HFILL }},
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{ &hf_krb4_ticket_length,
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{ "Ticket Length", "krb4.ticket.length",
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FT_UINT8, BASE_DEC, NULL, 0x00,
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"Length of ticket", HFILL }},
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{ &hf_krb4_request_length,
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{ "Request Length", "krb4.request.length",
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FT_UINT8, BASE_DEC, NULL, 0x00,
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"Length of request", HFILL }},
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{ &hf_krb4_ticket_blob,
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{ "Ticket Blob", "krb4.ticket.blob",
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FT_BYTES, BASE_NONE, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_request_blob,
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{ "Request Blob", "krb4.request.blob",
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FT_BYTES, BASE_NONE, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_encrypted_blob,
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{ "Encrypted Blob", "krb4.encrypted_blob",
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FT_BYTES, BASE_NONE, NULL, 0x00,
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NULL, HFILL }},
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{ &hf_krb4_unknown_transarc_blob,
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{ "Unknown Transarc Blob", "krb4.unknown_transarc_blob",
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FT_BYTES, BASE_NONE, NULL, 0x00,
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"Unknown blob only present in Transarc packets", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_krb4,
|
|
&ett_krb4_auth_msg_type,
|
|
};
|
|
|
|
proto_krb4 = proto_register_protocol("Kerberos v4",
|
|
"KRB4", "krb4");
|
|
krb4_handle = register_dissector("krb4", dissect_krb4, proto_krb4);
|
|
proto_register_field_array(proto_krb4, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_krb4(void)
|
|
{
|
|
dissector_add_uint_with_preference("udp.port", UDP_PORT_KRB4, krb4_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://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:
|
|
*/
|