+++ /dev/null
-/* -*-c-*-
- *
- * $Id$
- *
- * TrIPE protocol dissector for Ethereal
- *
- * (c) 2003 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Trivial IP Encryption (TrIPE).
- *
- * TrIPE 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.
- *
- * TrIPE 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 TrIPE; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include "config.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <netinet/in.h>
-
-#include <glib.h>
-#include <gmodule.h>
-#include <ethereal/config.h>
-#include <ethereal/epan/packet.h>
-#include <ethereal/epan/prefs.h>
-
-#include "tripe-protocol.h"
-
-/*----- Static variables --------------------------------------------------*/
-
-static int proto_tripe = -1;
-
-static guint hashsz = 20, tagsz = 10, ivsz = 8;
-
-typedef struct hfmp {
- int hf, hf_len, hf_val, tt;
-} hfmp;
-typedef struct hfge {
- int hf, hf_len, hf_val, hfx_len, hfx_val, hfy_len, hfy_val, tt;
-} hfge;
-
-static int hf_tripe_cat = -1;
-static int hf_tripe_packet_type = -1;
-static int hf_tripe_ct = -1;
-static int hf_tripe_ct_seq = -1;
-static int hf_tripe_ct_iv = -1;
-static int hf_tripe_ct_ct = -1;
-static int hf_tripe_ct_tag = -1;
-static int hf_tripe_misc_type = -1;
-static int hf_tripe_misc_payload = -1;
-static int hf_tripe_kx_type = -1;
-static hfge hf_tripe_kx_mychal = { -1, -1, -1, -1, -1, -1, -1, -1 };
-static int hf_tripe_kx_mycookie = -1;
-static int hf_tripe_kx_yourcookie = -1;
-static hfmp hf_tripe_kx_check = { -1, -1, -1, -1 };
-static int hf_tripe_huh = -1;
-
-static int tt_tripe = -1;
-static int tt_tripe_ct = -1;
-
-G_MODULE_EXPORT const gchar version[] = VERSION;
-
-/*----- Main code ---------------------------------------------------------*/
-
-static void prefcb(void) { }
-
-static gint gethash(proto_tree *tt, int hf, tvbuff_t *b, gint off)
-{
- proto_tree_add_item(tt, hf, b, off, hashsz, FALSE);
- return (off + hashsz);
-}
-
-static gint getmp(proto_tree *tt, const hfmp *hf, tvbuff_t *b, gint off)
-{
- guint16 len = tvb_get_ntohs(b, off);
- proto_item *ti = proto_tree_add_item(tt, hf->hf, b, off, len + 2, FALSE);
- tt = proto_item_add_subtree(ti, hf->tt);
- proto_tree_add_item(tt, hf->hf_len, b, off, 2, FALSE);
- proto_tree_add_item(tt, hf->hf_val, b, off + 2, len, FALSE);
- return (off + 2 + len);
-}
-
-static gint getge(proto_tree *tt, const hfge *hf, tvbuff_t *b, gint off)
-{
- guint16 len = tvb_get_ntohs(b, off), len2;
- guint r;
- proto_item *ti;
- r = tvb_length_remaining(b, off);
- if (r < 4 + len ||
- (len2 = tvb_get_ntohs(b, off + 2 + len), r < 4 + len + len2)) {
- ti = proto_tree_add_item(tt, hf->hf, b, off, len + 2, FALSE);
- tt = proto_item_add_subtree(ti, hf->tt);
- proto_tree_add_item(tt, hf->hf_len, b, off, 2, FALSE);
- proto_tree_add_item(tt, hf->hf_val, b, off + 2, len, FALSE);
- r = off + len + 2;
- } else {
- ti = proto_tree_add_item(tt, hf->hf, b, off, len + len2 + 4, FALSE);
- tt = proto_item_add_subtree(ti, hf->tt);
- proto_tree_add_item(tt, hf->hfx_len, b, off, 2, FALSE);
- proto_tree_add_item(tt, hf->hfx_val, b, off + 2, len, FALSE);
- proto_tree_add_item(tt, hf->hfy_len, b, off + 2 + len, 2, FALSE);
- proto_tree_add_item(tt, hf->hfy_val, b, off + 4 + len, len2, FALSE);
- r = off + len + len2 + 4;
- }
- return (r);
-}
-
-static void dissect_tripe(tvbuff_t *b, packet_info *p, proto_tree *t)
-{
- proto_item *ti;
- proto_tree *tt;
- guint8 ty;
- gint off = 0;
- guint32 seq;
-
- /* --- Initialize the summary cells --- */
-
- if (check_col(p->cinfo, COL_PROTOCOL))
- col_set_str(p->cinfo, COL_PROTOCOL, "TrIPE");
- if (check_col(p->cinfo, COL_INFO))
- col_clear(p->cinfo, COL_INFO);
- ty = tvb_get_guint8(b, 0);
- if (check_col(p->cinfo, COL_INFO)) {
- col_clear(p->cinfo, COL_INFO);
- switch (ty & MSG_CATMASK) {
- case MSG_PACKET:
- switch (ty & MSG_TYPEMASK) {
- case 0:
- col_set_str(p->cinfo, COL_INFO, "Packet data");
- break;
- default:
- col_add_fstr(p->cinfo, COL_INFO,
- "Packet data, unknown type code %u",
- ty & MSG_TYPEMASK);
- break;
- }
- break;
- case MSG_KEYEXCH:
- switch (ty & MSG_TYPEMASK) {
- case KX_PRECHAL:
- col_set_str(p->cinfo, COL_INFO, "Key exchange, prechallenge");
- break;
- case KX_COOKIE:
- col_set_str(p->cinfo, COL_INFO, "Key exchange, cookie");
- break;
- case KX_CHAL:
- col_set_str(p->cinfo, COL_INFO, "Key exchange, challenge");
- break;
- case KX_REPLY:
- col_set_str(p->cinfo, COL_INFO, "Key exchange, reply");
- break;
- case KX_SWITCH:
- col_set_str(p->cinfo, COL_INFO, "Key exchange, switch request");
- break;
- case KX_SWITCHOK:
- col_set_str(p->cinfo, COL_INFO, "Key exchange, switch response");
- break;
- default:
- col_add_fstr(p->cinfo, COL_INFO,
- "Key exchange, unknown type code %u",
- ty & MSG_TYPEMASK);
- break;
- }
- break;
- case MSG_MISC:
- switch (ty & MSG_TYPEMASK) {
- case MISC_NOP:
- col_set_str(p->cinfo, COL_INFO, "Miscellaneous, no-operation");
- break;
- case MISC_PING:
- col_set_str(p->cinfo, COL_INFO, "Miscellaneous, transport ping");
- break;
- case MISC_PONG:
- col_set_str(p->cinfo, COL_INFO,
- "Miscellaneous, transport ping reply");
- break;
- case MISC_EPING:
- col_set_str(p->cinfo, COL_INFO, "Miscellaneous, encrypted ping");
- break;
- case MISC_EPONG:
- col_set_str(p->cinfo, COL_INFO,
- "Miscellaneous, encrypted ping reply");
- break;
- case MISC_GREET:
- col_set_str(p->cinfo, COL_INFO,
- "Miscellaneous, greeting");
- break;
- default:
- col_add_fstr(p->cinfo, COL_INFO,
- "Miscellaneous, unknown type code %u",
- ty & MSG_TYPEMASK);
- break;
- }
- break;
- default:
- col_add_fstr(p->cinfo, COL_INFO,
- "Unknown category code %u, unknown type code %u",
- ty & MSG_CATMASK, ty & MSG_TYPEMASK);
- break;
- }
- }
-
- /* --- Fill in the tree --- */
-
- if (t) {
- ti = proto_tree_add_item(t, proto_tripe, b, 0, -1, FALSE);
- tt = proto_item_add_subtree(ti, tt_tripe);
-
- proto_tree_add_item(tt, hf_tripe_cat, b, 0, 1, FALSE);
-
- off = 1;
- switch (ty & MSG_CATMASK) {
- case MSG_PACKET:
- proto_tree_add_item(tt, hf_tripe_packet_type, b, 0, 1, FALSE);
- switch (ty & MSG_TYPEMASK) {
- case 0:
- goto ct;
- default:
- goto huh;
- }
- break;
- case MSG_KEYEXCH:
- proto_tree_add_item(tt, hf_tripe_kx_type, b, 0, 1, FALSE);
- switch (ty & MSG_TYPEMASK) {
- case KX_PRECHAL:
- off = getge(tt, &hf_tripe_kx_mychal, b, off);
- goto tail;
- case KX_COOKIE:
- off = getge(tt, &hf_tripe_kx_mychal, b, off);
- off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
- goto tail;
- case KX_CHAL:
- off = getge(tt, &hf_tripe_kx_mychal, b, off);
- off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
- off = getmp(tt, &hf_tripe_kx_check, b, off);
- goto tail;
- case KX_REPLY:
- off = gethash(tt, hf_tripe_kx_mycookie, b, off);
- off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
- off = getmp(tt, &hf_tripe_kx_check, b, off);
- goto ct;
- case KX_SWITCH:
- off = gethash(tt, hf_tripe_kx_mycookie, b, off);
- off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
- goto ct;
- case KX_SWITCHOK:
- goto ct;
- default:
- goto huh;
- }
- break;
- case MSG_MISC:
- proto_tree_add_item(tt, hf_tripe_misc_type, b, 0, 1, FALSE);
- switch (ty & MSG_TYPEMASK) {
- case MISC_NOP:
- case MISC_PING:
- case MISC_PONG:
- case MISC_GREET:
- proto_tree_add_item(tt, hf_tripe_misc_payload,
- b, off, -1, FALSE);
- goto done;
- case MISC_EPING:
- case MISC_EPONG:
- goto ct;
- default:
- goto huh;
- }
- break;
- default:
- goto huh;
- }
- tail:
- if (tvb_offset_exists(b, off))
- goto huh;
- goto done;
- huh:
- proto_tree_add_item(tt, hf_tripe_huh, b, off, -1, FALSE);
- goto done;
- ct:
- ti = proto_tree_add_item(tt, hf_tripe_ct, b, off, -1, FALSE);
- seq = tvb_get_ntohl(b, off + tagsz);
- proto_item_set_text(ti, "Encrypted ciphertext (sequence number %lu)",
- (unsigned long)seq);
- tt = proto_item_add_subtree(ti, tt_tripe_ct);
- if (tagsz) {
- proto_tree_add_item(tt, hf_tripe_ct_tag, b, off, tagsz, FALSE);
- off += tagsz;
- }
- proto_tree_add_item(tt, hf_tripe_ct_seq, b, off, 4, FALSE);
- off += 4;
- if (ivsz) {
- proto_tree_add_item(tt, hf_tripe_ct_iv, b, off, ivsz, FALSE);
- off += ivsz;
- }
- proto_tree_add_item(ti, hf_tripe_ct_ct, b, off, -1, FALSE);
- goto done;
- done:;
- }
-}
-
-void proto_register_tripe(void)
-{
- module_t *mod;
-
- static value_string vs_kxtype[] = {
- { KX_PRECHAL, "KX_PRECHAL (prechallenge)" },
- { KX_COOKIE, "KX_COOKIE (cookie)" },
- { KX_CHAL, "KX_CHAL (challenge)" },
- { KX_REPLY, "KX_REPLY (reply)" },
- { KX_SWITCH, "KX_SWITCH (switch request)" },
- { KX_SWITCHOK, "KX_SWITCHOK (switch response)" },
- { 0, 0 }
- };
-
- static hf_register_info hfs[] = {
- { &hf_tripe_cat, {
- "Message category", "tripe.cat",
- FT_UINT8, BASE_HEX, 0, MSG_CATMASK
- } },
- { &hf_tripe_packet_type, {
- "Packet message type", "tripe.packet.type",
- FT_UINT8, BASE_HEX, 0, MSG_TYPEMASK,
- "This is the TrIPE packet type subcode."
- } },
- { &hf_tripe_ct, {
- "Encrypted ciphertext", "tripe.ct",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is an encrypted message."
- } },
- { &hf_tripe_ct_seq, {
- "Ciphertext sequence number", "tripe.ct.seq",
- FT_UINT32, BASE_DEC, 0, 0,
- "This is the unique sequence number for the ciphertext."
- } },
- { &hf_tripe_ct_iv, {
- "Ciphertext initialization vector", "tripe.ct.iv",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the initialization vector used for the actual encryption."
- } },
- { &hf_tripe_ct_ct, {
- "Actual encrypted data", "tripe.ct.ct",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the encrypted message. Reading it ought to be hard."
- } },
- { &hf_tripe_ct_tag, {
- "Message authentication code", "tripe.ct.tag",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the message authentication code tag for the ciphertext."
- } },
- { &hf_tripe_misc_type, {
- "Miscellaneous message type", "tripe.misc.type",
- FT_UINT8, BASE_HEX, 0, MSG_TYPEMASK,
- "This is the TrIPE miscellaneous message type subcode."
- } },
- { &hf_tripe_misc_payload, {
- "Miscellaneous message payload", "tripe.misc.payload",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the miscellaneous message payload."
- } },
- { &hf_tripe_kx_type, {
- "Key-exchange message type", "tripe.kx.type",
- FT_UINT8, BASE_HEX, vs_kxtype, MSG_TYPEMASK,
- "This is the TrIPE key-exchange type subcode."
- } },
- { &hf_tripe_kx_mychal.hf, {
- "Sender's challenge data", "tripe.kx.mychal",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the sender's challenge."
- } },
- { &hf_tripe_kx_mychal.hf_len, {
- "Challenge length", "tripe.kx.mychal.len",
- FT_UINT16, BASE_DEC, 0, 0,
- "This is the length of the sender's challenge."
- } },
- { &hf_tripe_kx_mychal.hf_val, {
- "Challenge", "tripe.kx.mychal.val",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the value of the sender's challenge."
- } },
- { &hf_tripe_kx_mychal.hfx_len, {
- "Challenge x length", "tripe.kx.mychal.x.len",
- FT_UINT16, BASE_DEC, 0, 0,
- "This is the length of the sender's challenge x-coordinate."
- } },
- { &hf_tripe_kx_mychal.hfx_val, {
- "Challenge x value", "tripe.kx.mychal.x.val",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the value of the sender's challenge x-coordinate."
- } },
- { &hf_tripe_kx_mychal.hfy_len, {
- "Challenge y length", "tripe.kx.mychal.y.len",
- FT_UINT16, BASE_DEC, 0, 0,
- "This is the length of the sender's challenge x-coordinate."
- } },
- { &hf_tripe_kx_mychal.hfy_val, {
- "Challenge y value", "tripe.kx.mychal.y.val",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the value of the sender's challenge x-coordinate."
- } },
- { &hf_tripe_kx_mycookie, {
- "Sender's hashed cookie", "tripe.kx.mycookie",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the hash of the sender's challenge."
- } },
- { &hf_tripe_kx_yourcookie, {
- "Recipient's hashed cookie", "tripe.kx.yourcookie",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the hash of the recipient's challenge."
- } },
- { &hf_tripe_kx_check.hf, {
- "Challenge check-value", "tripe.kx.check",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is an encrypted check-value which proves that the sender "
- "knows the answer to the challenge, and that it is therefore honest."
- } },
- { &hf_tripe_kx_check.hf_len, {
- "Check-value length", "tripe.kx.check.len",
- FT_UINT16, BASE_DEC, 0, 0,
- "This is the length of the encrypted check-value."
- } },
- { &hf_tripe_kx_check.hf_val, {
- "Check-value data", "tripe.kx.check.val",
- FT_BYTES, BASE_NONE, 0, 0,
- "This is the actual encrypted check-value."
- } },
- { &hf_tripe_huh, {
- "Unknown data", "tripe.huh",
- FT_BYTES, BASE_NONE, 0, 0,
- "I don't know what's meant to appear here."
- } },
- };
-
- static gint *tts[] = {
- &tt_tripe,
- &tt_tripe_ct,
- &hf_tripe_kx_mychal.tt,
- &hf_tripe_kx_check.tt,
- };
-
- proto_tripe = proto_register_protocol("TrIPE", "TrIPE", "tripe");
- proto_register_field_array(proto_tripe, hfs, array_length(hfs));
- proto_register_subtree_array(tts, array_length(tts));
-
- mod = prefs_register_protocol(proto_tripe, prefcb);
- prefs_register_uint_preference(mod, "hashsz", "Hash length",
- "hash function output length (in octets)",
- 10, &hashsz);
- prefs_register_uint_preference(mod, "tagsz", "MAC tag length",
- "MAC tag length (in octets)", 10, &tagsz);
- prefs_register_uint_preference(mod, "ivsz", "IV length",
- "block cipher initialization vector length"
- " (in octets)",
- 10, &ivsz);
-}
-
-void proto_reg_handoff_tripe(void)
-{
- dissector_handle_t dh;
-
- dh = create_dissector_handle(dissect_tripe, proto_tripe);
- dissector_add("udp.port", 22003, dh);
-}
-
-G_MODULE_EXPORT void plugin_reg_handoff(void)
-{
- proto_reg_handoff_tripe();
-}
-
-G_MODULE_EXPORT void plugin_register(void)
-{
- if (proto_tripe == -1)
- proto_register_tripe();
-}
-
-/*----- That's all, folks -------------------------------------------------*/
~mdw / tripe / blobdiff