X-Git-Url: https://git.distorted.org.uk/~mdw/tripe/blobdiff_plain/de7bd20be1c41f8f70e98ab498ffb4a82800a9d8..28461f0eaead039da9acbc637392197aabf94815:/ethereal/packet-tripe.c diff --git a/ethereal/packet-tripe.c b/ethereal/packet-tripe.c deleted file mode 100644 index 4fa84028..00000000 --- a/ethereal/packet-tripe.c +++ /dev/null @@ -1,493 +0,0 @@ -/* -*-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 -#include -#include - -#include - -#include -#include -#include -#include -#include - -#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 -------------------------------------------------*/