new protocol : Kerberos v4

svn path=/trunk/; revision=12026

1 files changed, 372 insertions, 0 deletions

diff --git a/epan/dissectors/packet-kerberos4.c b/epan/dissectors/packet-kerberos4.c
new file mode 100644
index 0000000000..a9101e5270
--- /dev/null
+++ b/epan/dissectors/packet-kerberos4.c
@@ -0,0 +1,372 @@
+/* packet-kerberos4.c
+ * Routines for Kerberos v4 packet dissection
+ *
+ * Ronnie Sahlberg 2004
+ *
+ * $Id: packet-kerberos4.c 11410 2004-07-18 18:06:47Z gram $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+/*
+ * PDU structure based on the document :
+ *                                                              Section E.2.1
+ *
+ *                            Kerberos Authentication and Authorization System
+ *
+ *            by S. P. Miller, B. C. Neuman, J. I. Schiller, and J. H. Saltzer
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+#include <epan/packet.h>
+#include <epan/conversation.h>
+
+static int proto_krb4 = -1;
+static int hf_krb4_version = -1;
+static int hf_krb4_auth_msg_type = -1;
+static int hf_krb4_m_type = -1;
+static int hf_krb4_byte_order = -1;
+static int hf_krb4_name = -1;
+static int hf_krb4_instance = -1;
+static int hf_krb4_realm = -1;
+static int hf_krb4_time_sec = -1;
+static int hf_krb4_exp_date = -1;
+static int hf_krb4_lifetime = -1;
+static int hf_krb4_s_name = -1;
+static int hf_krb4_s_instance = -1;
+static int hf_krb4_kvno = -1;
+static int hf_krb4_length = -1;
+static int hf_krb4_encrypted_blob = -1;
+
+static gint ett_krb4 = -1;
+static gint ett_krb4_auth_msg_type = -1;
+
+#define UDP_PORT_KRB4    750
+
+static dissector_handle_t krb4_handle;
+
+
+static const value_string byte_order_vals[] = {
+	{ 0,	"Big Endian" },
+	{ 1,	"Little Endian" },
+	{ 0,	NULL }
+};
+
+#define AUTH_MSG_KDC_REQUEST		1
+#define AUTH_MSG_KDC_REPLY		2
+#define AUTH_MSG_APPL_REQUEST		3
+#define AUTH_MSG_APPL_REQUEST_MUTUAL	4
+#define AUTH_MSG_ERR_REPLY		5
+#define AUTH_MSG_PRIVATE		6
+#define AUTH_MSG_SAFE			7
+#define AUTH_MSG_APPL_ERR		8
+#define AUTH_MSG_DIE			63
+static const value_string m_type_vals[] = {
+	{ AUTH_MSG_KDC_REQUEST,		"KDC Request" },
+	{ AUTH_MSG_KDC_REPLY,		"KDC Reply" },
+	{ AUTH_MSG_APPL_REQUEST,	"Appl Request" },
+	{ AUTH_MSG_APPL_REQUEST_MUTUAL,	"Appl Request Mutual" },
+	{ AUTH_MSG_ERR_REPLY,		"Err Reply" },
+	{ AUTH_MSG_PRIVATE,		"Private" },
+	{ AUTH_MSG_SAFE,		"Safe" },
+	{ AUTH_MSG_APPL_ERR,		"Appl Err" },
+	{ AUTH_MSG_DIE,			"Die" },
+	{ 0,	NULL }
+};
+
+
+static int
+dissect_krb4_string(packet_info *pinfo _U_, int hf_index, proto_tree *tree, tvbuff_t *tvb, int offset)
+{
+	proto_tree_add_item(tree, hf_index, tvb, offset, -1, FALSE);
+	while(tvb_get_guint8(tvb, offset)!=0){
+		offset++;
+	}
+	offset++;
+
+	return offset;
+}
+
+static int
+dissect_krb4_kdc_request(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean little_endian)
+{
+	nstime_t time_sec;
+	guint8 lifetime;
+
+	/* Name */
+	offset=dissect_krb4_string(pinfo, hf_krb4_name, tree, tvb, offset);
+
+	/* Instance */
+	offset=dissect_krb4_string(pinfo, hf_krb4_instance, tree, tvb, offset);
+
+	/* Realm */
+	offset=dissect_krb4_string(pinfo, hf_krb4_realm, tree, tvb, offset);
+
+	/* Time sec */
+	time_sec.secs=little_endian?tvb_get_letohl(tvb, offset):tvb_get_ntohl(tvb, offset);
+	time_sec.nsecs=0;
+	proto_tree_add_time(tree, hf_krb4_time_sec, tvb, offset, 4, &time_sec);
+	offset+=4;
+
+	/* lifetime */
+	lifetime=tvb_get_guint8(tvb, offset);
+	proto_tree_add_uint_format(tree, hf_krb4_lifetime, tvb, offset, 1, lifetime, "Lifetime: %d (%d minutes)", lifetime, lifetime*5);
+	offset++;
+
+	/* service Name */
+	offset=dissect_krb4_string(pinfo, hf_krb4_s_name, tree, tvb, offset);
+
+	/* service Instance */
+	offset=dissect_krb4_string(pinfo, hf_krb4_s_instance, tree, tvb, offset);
+
+	return offset;
+}
+
+
+static int
+dissect_krb4_kdc_reply(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean little_endian)
+{
+	nstime_t time_sec;
+	guint32 length;
+
+	/* Name */
+	offset=dissect_krb4_string(pinfo, hf_krb4_name, tree, tvb, offset);
+
+	/* Instance */
+	offset=dissect_krb4_string(pinfo, hf_krb4_instance, tree, tvb, offset);
+
+	/* Realm */
+	offset=dissect_krb4_string(pinfo, hf_krb4_realm, tree, tvb, offset);
+
+	/* Time sec */
+	time_sec.secs=little_endian?tvb_get_letohl(tvb, offset):tvb_get_ntohl(tvb, offset);
+	time_sec.nsecs=0;
+	proto_tree_add_time(tree, hf_krb4_time_sec, tvb, offset, 4, &time_sec);
+	offset+=4;
+
+	/*XXX unknown byte here */
+	offset++;
+
+	/* exp date */
+	time_sec.secs=little_endian?tvb_get_letohl(tvb, offset):tvb_get_ntohl(tvb, offset);
+	time_sec.nsecs=0;
+	proto_tree_add_time(tree, hf_krb4_exp_date, tvb, offset, 4, &time_sec);
+	offset+=4;
+
+	/* kvno */
+	proto_tree_add_item(tree, hf_krb4_kvno, tvb, offset, 1, FALSE);
+	offset++;
+
+	/* length2 */
+	length=little_endian?tvb_get_letohs(tvb, offset):tvb_get_ntohs(tvb, offset);
+	proto_tree_add_uint_format(tree, hf_krb4_length, tvb, offset, 2, length, "Length: %d", length);
+	offset+=2;
+
+	/* encrypted blob */
+	proto_tree_add_item(tree, hf_krb4_encrypted_blob, tvb, offset, length, FALSE);
+	offset+=length;
+
+	return offset;
+}
+
+
+static int
+dissect_krb4_appl_request(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean little_endian _U_)
+{
+
+	/* kvno */
+	proto_tree_add_item(tree, hf_krb4_kvno, tvb, offset, 1, FALSE);
+	offset++;
+
+	/* Realm */
+	offset=dissect_krb4_string(pinfo, hf_krb4_realm, tree, tvb, offset);
+
+/*qqq doesnt make sense beyond this field*/
+	return offset;
+}
+
+
+
+static int
+dissect_krb4_auth_msg_type(packet_info *pinfo, proto_tree *parent_tree, tvbuff_t *tvb, int offset)
+{
+	proto_tree *tree;
+	proto_item *item;
+	guint8 auth_msg_type;
+
+	auth_msg_type=tvb_get_guint8(tvb, offset);
+	item = proto_tree_add_item(parent_tree, hf_krb4_auth_msg_type, tvb, offset, 1, FALSE);
+	tree = proto_item_add_subtree(item, ett_krb4_auth_msg_type);
+
+	/* m_type */
+	proto_tree_add_item(tree, hf_krb4_m_type, tvb, offset, 1, FALSE);
+	if (check_col(pinfo->cinfo, COL_INFO))
+	  col_append_fstr(pinfo->cinfo, COL_INFO, "%s",
+	    val_to_str(auth_msg_type>>1, m_type_vals, "Unknown (0x%04x)"));
+	proto_item_append_text(item, " %s", val_to_str(auth_msg_type>>1, m_type_vals, "Unknown (0x%04x)"));
+
+	/* byte order */
+	proto_tree_add_item(tree, hf_krb4_byte_order, tvb, offset, 1, FALSE);
+	proto_item_append_text(item, " (%s)", val_to_str(auth_msg_type&0x01, byte_order_vals, "Unknown (0x%04x)"));
+
+	offset++;
+	return offset;
+}
+
+static void
+dissect_krb4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
+{
+	proto_tree *tree;
+	proto_item *item;
+	guint8 version, opcode;
+	int offset=0;
+	
+	/* this should better have the value 4 or it might be a weirdo
+	 * Transarc AFS special unknown thing.
+	 */
+	version=tvb_get_guint8(tvb, offset);
+	if(version!=4){
+		return;
+	}
+
+	/* create a tree for krb4 */
+	item = proto_tree_add_item(parent_tree, proto_krb4, tvb, offset, -1, FALSE);
+	tree = proto_item_add_subtree(item, ett_krb4);
+	
+	if (check_col(pinfo->cinfo, COL_PROTOCOL))
+		col_set_str(pinfo->cinfo, COL_PROTOCOL, "KRB4");
+	if (check_col(pinfo->cinfo, COL_INFO))
+		col_clear(pinfo->cinfo, COL_INFO);
+
+	/* version */
+	proto_tree_add_item(tree, hf_krb4_version, tvb, offset, 1, FALSE);
+	offset++;
+
+	/* auth_msg_type */
+	opcode=tvb_get_guint8(tvb, offset);
+	offset = dissect_krb4_auth_msg_type(pinfo, tree, tvb, offset);
+
+	switch(opcode>>1){
+	case AUTH_MSG_KDC_REQUEST:
+		offset = dissect_krb4_kdc_request(pinfo, tree, tvb, offset, opcode&0x01);
+		break;
+	case AUTH_MSG_KDC_REPLY:
+		offset = dissect_krb4_kdc_reply(pinfo, tree, tvb, offset, opcode&0x01);
+		break;
+	case AUTH_MSG_APPL_REQUEST:
+		offset = dissect_krb4_appl_request(pinfo, tree, tvb, offset, opcode&0x01);
+		break;
+	case AUTH_MSG_APPL_REQUEST_MUTUAL:
+	case AUTH_MSG_ERR_REPLY:
+	case AUTH_MSG_PRIVATE:
+	case AUTH_MSG_SAFE:
+	case AUTH_MSG_APPL_ERR:
+	case AUTH_MSG_DIE:
+		break;
+	}
+
+}
+
+void
+proto_register_krb4(void)
+{
+  static hf_register_info hf[] = {
+    { &hf_krb4_version,
+      { "Version", "krb4.version",
+	FT_UINT8, BASE_DEC, NULL, 0x0,
+      	"Kerberos(v4) version number", HFILL }},
+    { &hf_krb4_auth_msg_type,
+      { "Msg Type", "krb4.auth_msg_type",
+        FT_UINT8, BASE_HEX, NULL, 0x0,
+        "Message Type/Byte Order", HFILL }},
+    { &hf_krb4_m_type,
+      { "M Type", "krb4.m_type",
+        FT_UINT8, BASE_HEX, VALS(m_type_vals), 0xfe,
+        "Message Type", HFILL }},
+    { &hf_krb4_byte_order,
+      { "Byte Order", "krb4.byte_order",
+        FT_UINT8, BASE_HEX, VALS(byte_order_vals), 0x01,
+        "Byte Order", HFILL }},
+    { &hf_krb4_name,
+      { "Name", "krb4.name",
+        FT_STRINGZ, BASE_NONE, NULL, 0x00,
+        "Name", HFILL }},
+    { &hf_krb4_instance,
+      { "Instance", "krb4.instance",
+        FT_STRINGZ, BASE_NONE, NULL, 0x00,
+        "Instance", HFILL }},
+    { &hf_krb4_realm,
+      { "Realm", "krb4.realm",
+        FT_STRINGZ, BASE_NONE, NULL, 0x00,
+        "Realm", HFILL }},
+    { &hf_krb4_time_sec,
+      { "Time Sec", "krb4.time_sec",
+        FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x00,
+        "Time Sec", HFILL }},
+    { &hf_krb4_exp_date,
+      { "Exp Date", "krb4.exp_date",
+        FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x00,
+        "Exp Date", HFILL }},
+    { &hf_krb4_lifetime,
+      { "Lifetime", "krb4.lifetime",
+        FT_UINT8, BASE_DEC, NULL, 0x00,
+        "Lifetime (in 5 min units)", HFILL }},
+    { &hf_krb4_s_name,
+      { "Service Name", "krb4.s_name",
+        FT_STRINGZ, BASE_NONE, NULL, 0x00,
+        "Service Name", HFILL }},
+    { &hf_krb4_s_instance,
+      { "Service Instance", "krb4.s_instance",
+        FT_STRINGZ, BASE_NONE, NULL, 0x00,
+        "Service Instance", HFILL }},
+    { &hf_krb4_kvno,
+      { "Kvno", "krb4.kvno",
+        FT_UINT8, BASE_DEC, NULL, 0x00,
+        "Key Version No", HFILL }},
+    { &hf_krb4_length,
+      { "Length", "krb4.length",
+        FT_UINT32, BASE_DEC, NULL, 0x00,
+        "Length of encrypted blob", HFILL }},
+    { &hf_krb4_encrypted_blob,
+      { "Encrypted Blob", "krb4.encrypted_blob",
+        FT_BYTES, BASE_HEX, NULL, 0x00,
+        "Encrypted blob", HFILL }},
+  };
+  static gint *ett[] = {
+    &ett_krb4,
+    &ett_krb4_auth_msg_type,
+  };
+
+  proto_krb4 = proto_register_protocol("Kerberos v4",
+				       "KRB4", "krb4");
+  proto_register_field_array(proto_krb4, hf, array_length(hf));
+  proto_register_subtree_array(ett, array_length(ett));
+
+  krb4_handle = create_dissector_handle(dissect_krb4, proto_krb4);
+}
+
+void
+proto_reg_handoff_krb4(void)
+{
+  dissector_add("udp.port", UDP_PORT_KRB4, krb4_handle);
+}