Wireshark · Ethereal-dev: [Ethereal-dev] Re: [PATCH] packet-pktc.c: PKTC MTA FQDN dissector

[Thomas Anders <thomas.anders@xxxxxxxxxxxxx>]

Thomas Anders wrote:
> The attached patch adds a new dissector for the PacketCable MTA FQDN 
> protocol

Oops: hf_pktc_mtafqdn_version should actually be FT_UINT8, not FT_UINT32.
Revised patch attached.


+Thomas

--
Thomas Anders (thomas.anders at blue-cable.de)

--- packet-pktc.c.v16	2004-05-25 11:41:03.000000000 +0200
+++ packet-pktc.c	2004-06-04 18:37:36.000000000 +0200
@@ -1,5 +1,6 @@
 /* packet-pktc.c
- * Routines for PacketCable (PKTC) Kerberized Key Management packet disassembly
+ * Routines for PacketCable (PKTC) Kerberized Key Management and
+ *              PacketCable (PKTC) MTA FQDN                  packet disassembly
  *
  * References: 
  * [1] PacketCable Security Specification, PKT-SP-SEC-I10-040113, January 13, 
@@ -38,6 +39,7 @@
 #include "packet-kerberos.h"
 
 #define PKTC_PORT	1293
+#define PKTC_MTAFQDN_PORT	2246
 
 static int proto_pktc = -1;
 static gint hf_pktc_app_spec_data = -1;
@@ -67,10 +69,21 @@
 static gint hf_pktc_sec_param_lifetime = -1;
 static gint hf_pktc_grace_period = -1;
 
+static gint hf_pktc_mtafqdn_msgtype = -1;
+static gint hf_pktc_mtafqdn_enterprise = -1;
+static gint hf_pktc_mtafqdn_version = -1;
+static gint hf_pktc_mtafqdn_mac = -1;
+static gint hf_pktc_mtafqdn_pub_key_hash = -1;
+static gint hf_pktc_mtafqdn_manu_cert_revoked = -1;
+static gint hf_pktc_mtafqdn_fqdn = -1;
+static gint hf_pktc_mtafqdn_ip = -1;
+
 static gint ett_pktc = -1;
 static gint ett_pktc_app_spec_data = -1;
 static gint ett_pktc_list_of_ciphersuites = -1;
 
+static gint ett_pktc_mtafqdn = -1;
+
 #define KMMID_WAKEUP		0x01
 #define KMMID_AP_REQUEST	0x02
 #define KMMID_AP_REPLY		0x03
@@ -104,8 +117,9 @@
 #define HMAC_SHA1_96   0x02
 
 
-/* Domain of Interpretation */static const value_string doi_types[] = {
-    { DOI_IPSEC		, "IPSec" },
+/* Domain of Interpretation */
+static const value_string doi_types[] = {
+    { DOI_IPSEC		, "IPsec" },
     { DOI_SNMPv3	, "SNMPv3" },
     { 0, NULL }
 };
@@ -117,7 +131,7 @@
     { 0        , NULL }
 };
 static const value_string snmp_transform_id_vals[] = {
-    { SNMPv3_NULL      , "NULL (no encryption)" },
+    { SNMPv3_NULL      , "NULL" }, /* no encryption */
     { SNMPv3_DES       , "DES" },
     { 0        , NULL }
 };
@@ -129,14 +143,25 @@
     { ESP_IDEA         , "IDEA" },
     { ESP_CAST         , "CAST" },
     { ESP_BLOWFISH     , "BLOWFISH" },
-    { ESP_NULL         , "NULL (no encryption)" },
+    { ESP_NULL         , "NULL" }, /* no encryption, RFC 2410 */
     { ESP_AES          , "AES-128" },
     { 0	, NULL }
 };
 
 static const value_string ipsec_authentication_algorithm_vals[] = {
-    { HMAC_MD5_96      , "HMAC-MD5-96" },
-    { HMAC_SHA1_96     , "HMAC-SHA-1-96" },
+    { HMAC_MD5_96      , "HMAC-MD5-96" },   /* RFC 2403 */
+    { HMAC_SHA1_96     , "HMAC-SHA-1-96" }, /* RFC 2404 */
+    { 0	, NULL }
+};
+
+/* MTA FQDN Message Types */
+#define PKTC_MTAFQDN_REQ	0x01
+#define PKTC_MTAFQDN_REP	0x02
+#define PKTC_MTAFQDN_ERR	0x03
+static const value_string pktc_mtafqdn_msgtype_vals[] = {
+    { PKTC_MTAFQDN_REQ,	"MTA FQDN Request" },
+    { PKTC_MTAFQDN_REP,	"MTA FQDN Reply" },
+    { PKTC_MTAFQDN_ERR,	"MTA FQDN Error Reply" },
     { 0	, NULL }
 };
 
@@ -189,7 +214,7 @@
 
             break;
         default:
-            proto_tree_add_text(tree, tvb, offset, 1, "Dont know how to parse this type of KMMID yet");
+            proto_tree_add_text(tree, tvb, offset, 1, "Unknown KMMID");
             tvb_get_guint8(tvb, 9999); /* bail out and inform user we cant dissect the packet */
         };
         break;
@@ -207,7 +232,7 @@
 
 	    break;
         default:
-            proto_tree_add_text(tree, tvb, offset, 1, "Dont know how to parse this type of KMMID yet");
+            proto_tree_add_text(tree, tvb, offset, 1, "Unknown KMMID");
             tvb_get_guint8(tvb, 9999); /* bail out and inform user we cant dissect the packet */
         };
 	break;
@@ -234,9 +259,12 @@
     }
 
 
-    /* key management message id */
+    /* number of ciphersuites */
     len=tvb_get_guint8(tvb, offset);
-    proto_tree_add_uint(tree, hf_pktc_list_of_ciphersuites_len, tvb, offset, 1, len);
+    if (len>0) {
+      proto_item_append_text(tree, " (%d):", len);
+    }
+    proto_tree_add_uint_hidden(tree, hf_pktc_list_of_ciphersuites_len, tvb, offset, 1, len);
     offset+=1;
 
     switch(doi){
@@ -244,10 +272,12 @@
         for(i=0;i<len;i++){
             /* SNMPv3 authentication algorithm */
             proto_tree_add_item(tree, hf_pktc_snmpAuthenticationAlgorithm, tvb, offset, 1, FALSE);
+	    proto_item_append_text(tree, " %s", val_to_str(tvb_get_guint8(tvb, offset), snmp_authentication_algorithm_vals, "%0x"));
             offset+=1;
 
             /* SNMPv3 encryption transform id */
             proto_tree_add_item(tree, hf_pktc_snmpEncryptionTransformID, tvb, offset, 1, FALSE);
+	    proto_item_append_text(tree, "/%s", val_to_str(tvb_get_guint8(tvb, offset), snmp_transform_id_vals, "%0x"));
             offset+=1;
 	}
 	break;
@@ -255,15 +285,17 @@
         for(i=0;i<len;i++){
             /* IPsec authentication algorithm */
             proto_tree_add_item(tree, hf_pktc_ipsecAuthenticationAlgorithm, tvb, offset, 1, FALSE);
+	    proto_item_append_text(tree, " %s", val_to_str(tvb_get_guint8(tvb, offset), ipsec_authentication_algorithm_vals, "%0x"));
             offset+=1;
 
             /* IPsec encryption transform id */
             proto_tree_add_item(tree, hf_pktc_ipsecEncryptionTransformID, tvb, offset, 1, FALSE);
+	    proto_item_append_text(tree, "/%s", val_to_str(tvb_get_guint8(tvb, offset), ipsec_transform_id_vals, "%0x"));
             offset+=1;
 	}
         break;
     default:
-        proto_tree_add_text(tree, tvb, offset, 1, "Dont know how to parse this type of Algorithm Identifier yet");
+        proto_tree_add_text(tree, tvb, offset, 1, "Unknown DOI");
 	tvb_get_guint8(tvb, 9999); /* bail out and inform user we cant dissect the packet */
     }
 
@@ -298,7 +330,7 @@
 
     /* AP Request  kerberos blob */
     pktc_tvb = tvb_new_subset(tvb, offset, -1, -1); 
-    offset += dissect_kerberos_main(pktc_tvb, pinfo, tree, FALSE);
+    offset += dissect_kerberos_main(pktc_tvb, pinfo, tree, FALSE, NULL);
 
     /* Server Nonce */
     snonce=tvb_get_ntohl(tvb, offset);
@@ -329,7 +361,7 @@
 
     /* AP Reply  kerberos blob */
     pktc_tvb = tvb_new_subset(tvb, offset, -1, -1); 
-    offset += dissect_kerberos_main(pktc_tvb, pinfo, tree, FALSE);
+    offset += dissect_kerberos_main(pktc_tvb, pinfo, tree, FALSE, NULL);
 
     /* app specific data */
     offset=dissect_pktc_app_specific_data(pinfo, tree, tvb, offset, doi, KMMID_AP_REPLY);
@@ -391,7 +423,8 @@
     /* They really came up with a two-digit year in late 1990s! =8o */
     timestr=tvb_get_ptr(tvb, offset, 13);
     proto_tree_add_string_format(tree, hf_pktc_timestamp, tvb, offset, 13, timestr, 
-				 "Timestamp: %.2s-%.2s-%.2s %.2s:%.2s:%.2s", 
+				 "%s: %.2s-%.2s-%.2s %.2s:%.2s:%.2s", 
+				 proto_registrar_get_name(hf_pktc_timestamp),
 				 timestr, timestr+2, timestr+4, timestr+6, timestr+8, timestr+10);
     offset+=13;
 
@@ -427,11 +460,109 @@
 
     /* KRB_ERROR */
     pktc_tvb = tvb_new_subset(tvb, offset, -1, -1); 
-    offset += dissect_kerberos_main(pktc_tvb, pinfo, tree, FALSE);
+    offset += dissect_kerberos_main(pktc_tvb, pinfo, tree, FALSE, NULL);
+
+    return offset;
+}
+
+static int
+dissect_pktc_mtafqdn_krbsafeuserdata(packet_info *pinfo, tvbuff_t *tvb, proto_tree *tree)
+{
+    int offset=0, string_len=0;
+    guint8 msgtype;
+    guint32 bignum;
+    nstime_t ts;
+
+    /* message type */
+    msgtype = tvb_get_guint8(tvb, offset);
+    proto_tree_add_uint(tree, hf_pktc_mtafqdn_msgtype, tvb, offset, 1, msgtype);
+    offset+=1;
+
+    if (check_col(pinfo->cinfo, COL_INFO))
+        col_set_str(pinfo->cinfo, COL_INFO, 
+		    val_to_str(msgtype, pktc_mtafqdn_msgtype_vals, "MsgType %u"));
+
+    /* enterprise */
+    proto_tree_add_uint(tree, hf_pktc_mtafqdn_enterprise, tvb, offset, 4, tvb_get_ntohl(tvb, offset));
+    offset+=4;
+
+    /* protocol version */
+    proto_tree_add_uint(tree, hf_pktc_mtafqdn_version, tvb, offset, 1, tvb_get_guint8(tvb, offset));
+    offset+=1;
+
+    switch(msgtype) {
+    case PKTC_MTAFQDN_REQ:
+        /* MTA MAC address */
+        proto_tree_add_ether(tree, hf_pktc_mtafqdn_mac, tvb, offset, 6, tvb_get_ptr(tvb, offset, 6));
+	offset+=6;
+
+	/* MTA pub key hash */
+	proto_tree_add_item(tree, hf_pktc_mtafqdn_pub_key_hash, tvb, offset, 20, FALSE);
+	offset+=20;
+
+	/* manufacturer cert revocation time */
+	bignum = tvb_get_ntohl(tvb, offset);
+	ts.secs = bignum;
+	proto_tree_add_time_format(tree, hf_pktc_mtafqdn_manu_cert_revoked, tvb, offset, 4, 
+				   &ts, "%s: %s",
+				   proto_registrar_get_name(hf_pktc_mtafqdn_manu_cert_revoked),
+				   (bignum==0) ? "not revoked" : abs_time_secs_to_str(bignum));
+	break;
+
+    case PKTC_MTAFQDN_REP:
+        /* MTA FQDN */
+        string_len = tvb_length_remaining(tvb, offset) - 4;
+	proto_tree_add_item(tree, hf_pktc_mtafqdn_fqdn, tvb, offset, string_len, FALSE); 
+	offset+=string_len;
+
+        /* MTA IP address */
+	tvb_memcpy(tvb, (guint8 *)&bignum, offset, sizeof(bignum));
+	proto_tree_add_ipv4(tree, hf_pktc_mtafqdn_ip, tvb, offset, 4, bignum);
+
+        break;
+    }
 
     return offset;
 }
 
+static kerberos_callbacks cb[] = {
+    { KRB_CBTAG_SAFE_USER_DATA,      dissect_pktc_mtafqdn_krbsafeuserdata },
+    { 0, NULL }
+};
+
+static void
+dissect_pktc_mtafqdn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+    int offset=0;
+    proto_tree *pktc_mtafqdn_tree = NULL;
+    proto_item *item = NULL;
+    tvbuff_t *pktc_mtafqdn_tvb;
+
+    if (check_col(pinfo->cinfo, COL_PROTOCOL))
+        col_set_str(pinfo->cinfo, COL_PROTOCOL, "PKTC");
+
+    if (tree) {
+        item = proto_tree_add_item(tree, proto_pktc, tvb, 0, 0, FALSE);
+        pktc_mtafqdn_tree = proto_item_add_subtree(item, ett_pktc_mtafqdn);
+    }
+
+    if (check_col(pinfo->cinfo, COL_INFO)) {
+        col_add_fstr(pinfo->cinfo, COL_INFO, "MTA FQDN %s",
+		     pinfo->srcport == pinfo->match_port ? "Reply":"Request");
+    }
+
+
+    /* KRB_AP_RE[QP] */
+    pktc_mtafqdn_tvb = tvb_new_subset(tvb, offset, -1, -1); 
+    offset += dissect_kerberos_main(pktc_mtafqdn_tvb, pinfo, pktc_mtafqdn_tree, FALSE, NULL);
+
+    /* KRB_SAFE */
+    pktc_mtafqdn_tvb = tvb_new_subset(tvb, offset, -1, -1); 
+    offset += dissect_kerberos_main(pktc_mtafqdn_tvb, pinfo, pktc_mtafqdn_tree, FALSE, cb);
+
+    proto_item_set_len(item, offset);
+}
+
 static void
 dissect_pktc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 {
@@ -460,8 +591,9 @@
     
     /* version */
     version=tvb_get_guint8(tvb, offset);
-    proto_tree_add_uint(pktc_tree, hf_pktc_version_major, tvb, offset, 1, (version>>4)&0x0f);
-    proto_tree_add_uint(pktc_tree, hf_pktc_version_minor, tvb, offset, 1, (version)&0x0f);
+    proto_tree_add_text(pktc_tree, tvb, offset, 1, "Version: %d.%d", (version>>4)&0x0f, (version)&0x0f);
+    proto_tree_add_uint_hidden(pktc_tree, hf_pktc_version_major, tvb, offset, 1, (version>>4)&0x0f);
+    proto_tree_add_uint_hidden(pktc_tree, hf_pktc_version_minor, tvb, offset, 1, (version)&0x0f);
     offset+=1;
 
     /* fill COL_INFO */
@@ -525,10 +657,10 @@
 	    "Application Specific Data", "pktc.asd", FT_NONE, BASE_HEX,
 	    NULL, 0, "KMMID/DOI application specific data", HFILL }},
 	{ &hf_pktc_list_of_ciphersuites, {
-	    "List of Ciphersuites", "pktc.list_of_ciphersuites", FT_NONE, BASE_HEX,
+	    "List of Ciphersuites", "pktc.ciphers", FT_NONE, BASE_HEX,
 	    NULL, 0, "List of Ciphersuites", HFILL }},
 	{ &hf_pktc_list_of_ciphersuites_len, {
-	    "Number of Ciphersuites", "pktc.list_of_ciphersuites.len", FT_UINT8, BASE_DEC,
+	    "Number of Ciphersuites", "pktc.ciphers.len", FT_UINT8, BASE_DEC,
 	    NULL, 0, "Number of Ciphersuites", HFILL }},
 	{ &hf_pktc_snmpAuthenticationAlgorithm, {
            "SNMPv3 Authentication Algorithm", "pktc.asd.snmp_auth_alg", FT_UINT8, BASE_HEX,
@@ -585,8 +717,7 @@
         &ett_pktc_list_of_ciphersuites,
     };
 
-    proto_pktc = proto_register_protocol("PacketCable",
-	"PKTC", "pktc");
+    proto_pktc = proto_register_protocol("PacketCable", "PKTC", "pktc");
     proto_register_field_array(proto_pktc, hf, array_length(hf));
     proto_register_subtree_array(ett, array_length(ett));
 }
@@ -599,3 +730,51 @@
     pktc_handle = create_dissector_handle(dissect_pktc, proto_pktc);
     dissector_add("udp.port", PKTC_PORT, pktc_handle);
 }
+
+void
+proto_register_pktc_mtafqdn(void)
+{
+    static hf_register_info hf[] = {
+	{ &hf_pktc_mtafqdn_msgtype, {
+	    "Message Type", "pktc.mtafqdn.msgtype", FT_UINT8, BASE_DEC,
+	    VALS(pktc_mtafqdn_msgtype_vals), 0, "MTA FQDN Message Type", HFILL }},
+	{ &hf_pktc_mtafqdn_enterprise, {
+	    "Enterprise Number", "pktc.mtafqdn.enterprise", FT_UINT32, BASE_DEC,
+	    NULL, 0, "Enterprise Number", HFILL }},
+	{ &hf_pktc_mtafqdn_version, {
+	    "Protocol Version", "pktc.mtafqdn.version", FT_UINT8, BASE_DEC,
+	    NULL, 0, "MTA FQDN Protocol Version", HFILL }},
+	/* MTA FQDN REQ */
+	{ &hf_pktc_mtafqdn_mac, {
+	    "MTA MAC address", "pktc.mtafqdn.mac", FT_ETHER, BASE_NONE,
+	    NULL, 0, "MTA MAC address", HFILL }},
+	{ &hf_pktc_mtafqdn_pub_key_hash, {
+	    "MTA Public Key Hash", "pktc.mtafqdn.pub_key_hash", FT_BYTES, BASE_HEX,
+	    NULL, 0, "MTA Public Key Hash (SHA-1)", HFILL }},
+	{ &hf_pktc_mtafqdn_manu_cert_revoked, {
+	    "Manufacturer Cert Revocation Time", "pktc.mtafqdn.manu_cert_revoked", FT_ABSOLUTE_TIME, BASE_NONE,
+	    NULL, 0, "Manufacturer Cert Revocation Time (UTC) or 0 if not revoked", HFILL }},
+	/* MTA FQDN REP */
+	{ &hf_pktc_mtafqdn_fqdn, {
+	    "MTA FQDN", "pktc.mtafqdn.fqdn", FT_STRING, BASE_NONE,
+	    NULL, 0, "MTA FQDN", HFILL }},
+	{ &hf_pktc_mtafqdn_ip, {
+	    "MTA IP Address", "pktc.mtafqdn.ip", FT_IPv4, BASE_NONE,
+	    NULL, 0, "MTA IP Address (all zeros if not supplied)", HFILL }},
+    };
+    static gint *ett[] = {
+        &ett_pktc_mtafqdn,
+    };
+
+    proto_register_field_array(proto_pktc, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+}
+
+void
+proto_reg_handoff_pktc_mtafqdn(void)
+{
+    dissector_handle_t pktc_mtafqdn_handle;
+
+    pktc_mtafqdn_handle = create_dissector_handle(dissect_pktc_mtafqdn, proto_pktc);
+    dissector_add("udp.port", PKTC_MTAFQDN_PORT, pktc_mtafqdn_handle);
+}