diff options
Diffstat (limited to 'epan/dissectors/packet-fbzero.c')
| -rw-r--r-- | epan/dissectors/packet-fbzero.c | 709 |
1 files changed, 709 insertions, 0 deletions
diff --git a/epan/dissectors/packet-fbzero.c b/epan/dissectors/packet-fbzero.c new file mode 100644 index 00000000..08c11c4e --- /dev/null +++ b/epan/dissectors/packet-fbzero.c @@ -0,0 +1,709 @@ +/* packet-fbzero.c + * Routines for Zero Protocol dissection + * Copyright 2016-2017, Alexis La Goutte <alexis.lagoutte at gmail dot com> + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +/* + * Zero Protocol coming from Facebook and used the same framing like QUIC + * (tag-map value) but based on TCP + * + * See + * + * https://engineering.fb.com/networking-traffic/building-zero-protocol-for-fast-secure-mobile-connections/ + * + * for some (not much!) information on it. + * + * It was reverse engineered based off of QUIC dissector functionality + */ +#include "config.h" + +#include <epan/packet.h> +#include <epan/prefs.h> +#include <epan/expert.h> +#include <epan/conversation.h> + +void proto_register_fb_zero(void); +void proto_reg_handoff_fb_zero(void); + +static int proto_fb_zero = -1; + +static dissector_handle_t fb_zero_handle; + +static int hf_fb_zero_puflags = -1; +static int hf_fb_zero_puflags_vrsn = -1; +static int hf_fb_zero_puflags_unknown = -1; +static int hf_fb_zero_version = -1; +static int hf_fb_zero_length = -1; +static int hf_fb_zero_tag = -1; +static int hf_fb_zero_tags = -1; +static int hf_fb_zero_tag_number = -1; +static int hf_fb_zero_tag_value = -1; +static int hf_fb_zero_tag_type = -1; +static int hf_fb_zero_tag_offset_end = -1; +static int hf_fb_zero_tag_length = -1; +static int hf_fb_zero_tag_sni = -1; +static int hf_fb_zero_tag_vers = -1; +static int hf_fb_zero_tag_sno = -1; +static int hf_fb_zero_tag_aead = -1; +static int hf_fb_zero_tag_scid = -1; +static int hf_fb_zero_tag_time = -1; +static int hf_fb_zero_tag_alpn = -1; +static int hf_fb_zero_tag_pubs = -1; +static int hf_fb_zero_tag_kexs = -1; +static int hf_fb_zero_tag_nonc = -1; + +static int hf_fb_zero_tag_unknown = -1; + +static int hf_fb_zero_padding = -1; +static int hf_fb_zero_payload = -1; +static int hf_fb_zero_unknown = -1; + +static gint ett_fb_zero = -1; +static gint ett_fb_zero_puflags = -1; +static gint ett_fb_zero_prflags = -1; +static gint ett_fb_zero_ft = -1; +static gint ett_fb_zero_ftflags = -1; +static gint ett_fb_zero_tag_value = -1; + +static expert_field ei_fb_zero_tag_undecoded = EI_INIT; +static expert_field ei_fb_zero_tag_offset_end_invalid = EI_INIT; +static expert_field ei_fb_zero_length_invalid = EI_INIT; + +#define FBZERO_MIN_LENGTH 3 + +#define VERSION_QTV 0x515456 + +/**************************************************************************/ +/* Public Flags */ +/**************************************************************************/ +#define PUFLAGS_VRSN 0x01 +#define PUFLAGS_UNKN 0xFE + +/**************************************************************************/ +/* Message tag */ +/**************************************************************************/ + +#define MTAG_CHLO 0x43484C4F +#define MTAG_SNOM 0x534E4F4D +#define MTAG_SHLO 0x53484C4F +#define MTAG_REJ 0x52454A00 +#define MTAG_PRST 0x50525354 + +static const value_string message_tag_vals[] = { + { MTAG_CHLO, "Client Hello" }, + { MTAG_SNOM, "Server NOM??" }, + { MTAG_SHLO, "Server Hello" }, + { MTAG_REJ, "Rejection" }, + { MTAG_PRST, "Public Reset" }, + { 0, NULL } +}; + +/**************************************************************************/ +/* Tag */ +/**************************************************************************/ + +#define TAG_SNI 0x534E4900 +#define TAG_VERS 0x56455253 +#define TAG_SNO 0x534E4F00 +#define TAG_AEAD 0x41454144 +#define TAG_SCID 0x53434944 +#define TAG_TIME 0x54494d45 +#define TAG_ALPN 0x414C504E +#define TAG_PUBS 0x50554253 +#define TAG_KEXS 0x4B455853 +#define TAG_NONC 0x4E4F4E43 + +static const value_string tag_vals[] = { + { TAG_SNI, "Server Name Indication" }, + { TAG_VERS, "Version" }, + { TAG_SNO, "Server nonce" }, + { TAG_AEAD, "Authenticated encryption algorithms" }, + { TAG_SCID, "Server config ID" }, + { TAG_TIME, "Time" }, + { TAG_ALPN, "ALPN" }, + { TAG_PUBS, "Public value" }, + { TAG_KEXS, "Key exchange algorithms" }, + { TAG_NONC, "Client Nonce" }, + { 0, NULL } +}; + + +/**************************************************************************/ +/* AEAD Tag */ +/**************************************************************************/ + +#define AEAD_AESG 0x41455347 +#define AEAD_S20P 0x53323050 +#define AEAD_CC12 0x43433132 + +static const value_string tag_aead_vals[] = { + { AEAD_AESG, "AES-GCM with a 12-byte tag and IV" }, + { AEAD_S20P, "Salsa20 with Poly1305" }, + { AEAD_CC12, "Salsa20 with Poly1305" }, + { 0, NULL } +}; + +/**************************************************************************/ +/* KEXS Tag */ +/**************************************************************************/ + +#define KEXS_C255 0x43323535 +#define KEXS_P256 0x50323536 + +static const value_string tag_kexs_vals[] = { + { KEXS_C255, "Curve25519" }, + { KEXS_P256, "P-256" }, + { 0, NULL } +}; + + +static guint32 +dissect_fb_zero_tag(tvbuff_t *tvb, packet_info *pinfo, proto_tree *fb_zero_tree, guint offset, guint32 tag_number){ + guint32 tag_offset_start = offset + tag_number*4*2; + guint32 tag_offset = 0, total_tag_len = 0; + gint32 tag_len = 0; + gboolean tag_offset_valid = TRUE; + + while(tag_number){ + proto_tree *tag_tree; + proto_item *ti_tag, *ti_type, *ti_offset_len, *ti_len; + guint32 offset_end, tag; + const guint8* tag_str; + + /* + * This item covers the tag type and end offset; the tag values + * are in a separate region following all the type/end offset + * pairs. + */ + ti_tag = proto_tree_add_item(fb_zero_tree, hf_fb_zero_tags, tvb, offset, 4*2, ENC_NA); + tag_tree = proto_item_add_subtree(ti_tag, ett_fb_zero_tag_value); + ti_type = proto_tree_add_item_ret_string(tag_tree, hf_fb_zero_tag_type, tvb, offset, 4, ENC_ASCII|ENC_NA, pinfo->pool, &tag_str); + tag = tvb_get_ntohl(tvb, offset); + proto_item_append_text(ti_type, " (%s)", val_to_str_const(tag, tag_vals, "Unknown")); + proto_item_append_text(ti_tag, ": %s (%s)", tag_str, val_to_str_const(tag, tag_vals, "Unknown")); + offset += 4; + + ti_offset_len = proto_tree_add_item_ret_uint(tag_tree, hf_fb_zero_tag_offset_end, tvb, offset, 4, ENC_LITTLE_ENDIAN, &offset_end); + if(offset_end < tag_offset){ + expert_add_info_format(pinfo, ti_offset_len, &ei_fb_zero_tag_offset_end_invalid, + "Invalid tag end offset %u < %u", + offset_end, tag_offset); + /* + * We can continue to show the tag type, end offset, and length, + * but we can no longer show the values, or subsequent length + * values, as the end offset in the tag value region is bogus. + */ + tag_offset_valid = FALSE; + } else { + tag_len = offset_end - tag_offset; + if(!tvb_bytes_exist(tvb, tag_offset_start + tag_offset, tag_len)){ + expert_add_info_format(pinfo, ti_offset_len, &ei_fb_zero_tag_offset_end_invalid, + "Invalid tag end offset %u past end of packet", + offset_end); + /* + * We can continue to show the tag type, end offset, + * and length, but we can no longer show the values, + * as the end offset in the tag value region is bogus. + * + * We don't just throw an exception here, because we + * want to show all the tag type and end offset values. + */ + tag_offset_valid = FALSE; + } + total_tag_len += tag_len; + ti_len = proto_tree_add_uint(tag_tree, hf_fb_zero_tag_length, tvb, offset, 4, tag_len); + proto_item_append_text(ti_tag, " (l=%u)", tag_len); + proto_item_set_generated(ti_len); + } + offset += 4; + + if(tag_offset_valid){ + proto_tree_add_item(tag_tree, hf_fb_zero_tag_value, tvb, tag_offset_start + tag_offset, tag_len, ENC_NA); + } + + switch(tag){ + case TAG_SNI: + if(tag_offset_valid){ + proto_tree_add_item_ret_string(tag_tree, hf_fb_zero_tag_sni, tvb, tag_offset_start + tag_offset, tag_len, ENC_ASCII|ENC_NA, pinfo->pool, &tag_str); + proto_item_append_text(ti_tag, ": %s", tag_str); + tag_offset += tag_len; + } + break; + case TAG_VERS: + if(tag_offset_valid){ + if(tag_len != 4){ + expert_add_info_format(pinfo, fb_zero_tree, &ei_fb_zero_length_invalid, + "Invalid tag length: %u, should be 4", tag_len); + tag_offset += tag_len; + break; + } + proto_tree_add_item_ret_string(tag_tree, hf_fb_zero_tag_vers, tvb, tag_offset_start + tag_offset, 4, ENC_ASCII|ENC_NA, pinfo->pool, &tag_str); + proto_item_append_text(ti_tag, ": %s", tag_str); + tag_offset += 4; + } + break; + case TAG_SNO: + if(tag_offset_valid){ + proto_tree_add_item(tag_tree, hf_fb_zero_tag_sno, tvb, tag_offset_start + tag_offset, tag_len, ENC_NA); + tag_offset += tag_len; + } + break; + case TAG_AEAD: + if(tag_offset_valid){ + while(offset_end - tag_offset >= 4){ + proto_tree *ti_aead; + ti_aead = proto_tree_add_item(tag_tree, hf_fb_zero_tag_aead, tvb, tag_offset_start + tag_offset, 4, ENC_ASCII); + proto_item_append_text(ti_aead, " (%s)", val_to_str_const(tvb_get_ntohl(tvb, tag_offset_start + tag_offset), tag_aead_vals, "Unknown")); + proto_item_append_text(ti_tag, ", %s", val_to_str_const(tvb_get_ntohl(tvb, tag_offset_start + tag_offset), tag_aead_vals, "Unknown")); + tag_offset += 4; + } + if(offset_end - tag_offset > 0){ + expert_add_info_format(pinfo, fb_zero_tree, &ei_fb_zero_length_invalid, + "Invalid tag length: %u, should be a multiple of 4", tag_len); + tag_offset = offset_end; + } + } + break; + case TAG_SCID: + if(tag_offset_valid){ + proto_tree_add_item(tag_tree, hf_fb_zero_tag_scid, tvb, tag_offset_start + tag_offset, tag_len, ENC_NA); + tag_offset += tag_len; + } + break; + case TAG_TIME: + if(tag_offset_valid){ + if(tag_len != 4){ + expert_add_info_format(pinfo, fb_zero_tree, &ei_fb_zero_length_invalid, + "Invalid tag length: %u, should be 4", tag_len); + tag_offset += tag_len; + break; + } + proto_tree_add_item(tag_tree, hf_fb_zero_tag_time, tvb, tag_offset_start + tag_offset, 4, ENC_LITTLE_ENDIAN); + proto_item_append_text(ti_tag, ": %u", tvb_get_letohl(tvb, tag_offset_start + tag_offset)); + tag_offset += 4; + } + break; + case TAG_ALPN: + if(tag_offset_valid){ + if(tag_len != 4){ + expert_add_info_format(pinfo, fb_zero_tree, &ei_fb_zero_length_invalid, + "Invalid tag length: %u, should be 4", tag_len); + tag_offset += tag_len; + break; + } + proto_tree_add_item_ret_string(tag_tree, hf_fb_zero_tag_alpn, tvb, tag_offset_start + tag_offset, 4, ENC_ASCII|ENC_NA, pinfo->pool, &tag_str); + proto_item_append_text(ti_tag, ": %s", tag_str); + tag_offset += 4; + } + break; + case TAG_PUBS: + if(tag_offset_valid){ + /*TODO FIX: 24 Length + Pubs key?.. ! */ + if(tag_len < 2){ + expert_add_info_format(pinfo, fb_zero_tree, &ei_fb_zero_length_invalid, + "Invalid tag length: %u, should be >= 2", tag_len); + tag_offset += tag_len; + break; + } + proto_tree_add_item(tag_tree, hf_fb_zero_tag_pubs, tvb, tag_offset_start + tag_offset, 2, ENC_LITTLE_ENDIAN); + tag_offset += 2; + while(offset_end - tag_offset >= 3){ + proto_tree_add_item(tag_tree, hf_fb_zero_tag_pubs, tvb, tag_offset_start + tag_offset, 3, ENC_LITTLE_ENDIAN); + tag_offset += 3; + } + if(offset_end - tag_offset > 0){ + expert_add_info_format(pinfo, fb_zero_tree, &ei_fb_zero_length_invalid, + "Invalid tag length: %u, should be a multiple of 3", tag_len); + tag_offset = offset_end; + } + } + break; + case TAG_KEXS: + if(tag_offset_valid){ + while(offset_end - tag_offset >= 4){ + proto_tree *ti_kexs; + ti_kexs = proto_tree_add_item(tag_tree, hf_fb_zero_tag_kexs, tvb, tag_offset_start + tag_offset, 4, ENC_ASCII); + proto_item_append_text(ti_kexs, " (%s)", val_to_str_const(tvb_get_ntohl(tvb, tag_offset_start + tag_offset), tag_kexs_vals, "Unknown")); + proto_item_append_text(ti_tag, ", %s", val_to_str_const(tvb_get_ntohl(tvb, tag_offset_start + tag_offset), tag_kexs_vals, "Unknown")); + tag_offset += 4; + } + if(offset_end - tag_offset > 0){ + expert_add_info_format(pinfo, fb_zero_tree, &ei_fb_zero_length_invalid, + "Invalid tag length: %u, should be a multiple of 4", tag_len); + tag_offset = offset_end; + } + } + break; + case TAG_NONC: + if(tag_offset_valid){ + /*TODO: Enhance display: 32 bytes consisting of 4 bytes of timestamp (big-endian, UNIX epoch seconds), 8 bytes of server orbit and 20 bytes of random data. */ + if(tag_len != 32){ + expert_add_info_format(pinfo, fb_zero_tree, &ei_fb_zero_length_invalid, + "Invalid tag length: %u, should be 32", tag_len); + tag_offset += tag_len; + break; + } + proto_tree_add_item(tag_tree, hf_fb_zero_tag_nonc, tvb, tag_offset_start + tag_offset, 32, ENC_NA); + tag_offset += 32; + } + break; + default: + expert_add_info_format(pinfo, ti_tag, &ei_fb_zero_tag_undecoded, + "Dissector for FB Zero Tag" + " %s (%s) code not implemented, Contact" + " Wireshark developers if you want this supported", + tvb_get_string_enc(pinfo->pool, tvb, offset-8, 4, ENC_ASCII|ENC_NA), val_to_str_const(tag, tag_vals, "Unknown")); + if(tag_offset_valid){ + proto_tree_add_item(tag_tree, hf_fb_zero_tag_unknown, tvb, tag_offset_start + tag_offset, tag_len, ENC_NA); + tag_offset += tag_len; + } + break; + } + + tag_number--; + } + + /* XXX - can this still occur? */ + if (offset + total_tag_len <= offset) { + expert_add_info_format(pinfo, fb_zero_tree, &ei_fb_zero_length_invalid, + "Invalid total tag length: %u", total_tag_len); + return offset + tvb_reported_length_remaining(tvb, offset); + } + return offset + total_tag_len; + +} + + +static int +dissect_fb_zero_unencrypt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *fb_zero_tree, guint offset, guint8 len_pkn _U_){ + + while(tvb_reported_length_remaining(tvb, offset) > 0){ + proto_item *ti; + guint32 message_tag, tag_number, length; + const guint8* message_tag_str; + proto_tree_add_item(fb_zero_tree, hf_fb_zero_unknown, tvb, offset, 1, ENC_NA); + offset += 1; + + /* + * XXX: in theory, a tagged message could be split between + * TCP segments - even the *header containing the length* + * could be split - but, from the sequence described in the + * Facebook blog post, that's probably unlikely in practice. + */ + proto_tree_add_item_ret_uint(fb_zero_tree, hf_fb_zero_length, tvb, offset, 4, ENC_LITTLE_ENDIAN, &length); + offset += 4; + + message_tag = tvb_get_ntohl(tvb, offset); + /* check if it is a known message_tag (CHLO, SNOM...) */ + if(try_val_to_str(message_tag, message_tag_vals)){ + ti = proto_tree_add_item_ret_string(fb_zero_tree, hf_fb_zero_tag, tvb, offset, 4, ENC_ASCII|ENC_NA, pinfo->pool, &message_tag_str); + + proto_item_append_text(ti, ", Type: %s (%s)", message_tag_str, + val_to_str_const(message_tag, message_tag_vals, "Unknown Tag")); + col_add_str(pinfo->cinfo, COL_INFO, val_to_str_const(message_tag, message_tag_vals, "Unknown")); + offset += 4; + + proto_tree_add_item(fb_zero_tree, hf_fb_zero_tag_number, tvb, offset, 2, ENC_LITTLE_ENDIAN); + tag_number = tvb_get_letohs(tvb, offset); + offset += 2; + + proto_tree_add_item(fb_zero_tree, hf_fb_zero_padding, tvb, offset, 2, ENC_NA); + offset += 2; + + offset = dissect_fb_zero_tag(tvb, pinfo, fb_zero_tree, offset, tag_number); + } else { + proto_tree_add_item(fb_zero_tree, hf_fb_zero_unknown, tvb, offset, length, ENC_NA); + offset += length; + } + } + + return offset; + +} + +static int +dissect_fb_zero_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, + void *data _U_) +{ + proto_item *ti, *ti_puflags; + proto_tree *fb_zero_tree, *puflags_tree; + guint offset = 0; + guint8 puflags; + guint32 message_tag, version; + + if (tvb_captured_length(tvb) < FBZERO_MIN_LENGTH) + return 0; + + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "FB_ZERO"); + + ti = proto_tree_add_item(tree, proto_fb_zero, tvb, 0, -1, ENC_NA); + fb_zero_tree = proto_item_add_subtree(ti, ett_fb_zero); + + /* Public Flags */ + ti_puflags = proto_tree_add_item(fb_zero_tree, hf_fb_zero_puflags, tvb, offset, 1, ENC_LITTLE_ENDIAN); + puflags_tree = proto_item_add_subtree(ti_puflags, ett_fb_zero_puflags); + proto_tree_add_item(puflags_tree, hf_fb_zero_puflags_vrsn, tvb, offset, 1, ENC_NA); + proto_tree_add_item(puflags_tree, hf_fb_zero_puflags_unknown, tvb, offset, 1, ENC_LITTLE_ENDIAN); + puflags = tvb_get_guint8(tvb, offset); + offset += 1; + + if(puflags & PUFLAGS_VRSN){ + version = tvb_get_ntoh24(tvb, offset); + if(version == VERSION_QTV){ + proto_tree_add_item(fb_zero_tree, hf_fb_zero_version, tvb, offset, 3, ENC_ASCII); + offset += 3; + } + } + + /* Unencrypt Message (Handshake or Connection Close...) */ + message_tag = tvb_get_ntohl(tvb, offset+5); + if (message_tag == MTAG_CHLO || message_tag == MTAG_SNOM) { + offset = dissect_fb_zero_unencrypt(tvb, pinfo, fb_zero_tree, offset, 1); + + }else { /* Payload... (encrypted... TODO FIX !) */ + col_add_str(pinfo->cinfo, COL_INFO, "Payload (Encrypted)"); + proto_tree_add_item(fb_zero_tree, hf_fb_zero_payload, tvb, offset, -1, ENC_NA); + } + return offset; +} + + +static int +dissect_fb_zero(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, + void *data _U_) +{ + return dissect_fb_zero_common(tvb, pinfo, tree, NULL); +} + +static gboolean dissect_fb_zero_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data) +{ + conversation_t *conversation = NULL; + int offset = 0; + guint32 version, length, message_tag; + /* Verify packet size (Flag (1 byte) + Version (3bytes) + Flag (1 byte) + length (4 bytes) + Tag (4 bytes)) */ + if (tvb_captured_length(tvb) < 13) + { + return FALSE; + } + + /* Flag */ + offset += 1; + + /* Version */ + version = tvb_get_ntoh24(tvb, offset); + offset += 3; + + /* Flag */ + offset += 1; + + /* length */ + length = tvb_get_letohl(tvb, offset); + offset += 4; + + /* (message) tag */ + message_tag = tvb_get_ntohl(tvb, offset); + + if (version == VERSION_QTV && length <= tvb_reported_length(tvb) && (message_tag == MTAG_CHLO || message_tag == MTAG_SNOM)) { + conversation = find_or_create_conversation(pinfo); + conversation_set_dissector(conversation, fb_zero_handle); + dissect_fb_zero(tvb, pinfo, tree, data); + return TRUE; + } + + return FALSE; +} + +void +proto_register_fb_zero(void) +{ + static hf_register_info hf[] = { + { &hf_fb_zero_puflags, + { "Public Flags", "fb_zero.puflags", + FT_UINT8, BASE_HEX, NULL, 0x0, + "Specifying per-packet public flags", HFILL } + }, + { &hf_fb_zero_puflags_vrsn, + { "Version", "fb_zero.puflags.version", + FT_BOOLEAN, 8, TFS(&tfs_yes_no), PUFLAGS_VRSN, + "Signifies that this packet also contains the version of the FB Zero protocol", HFILL } + }, + { &hf_fb_zero_puflags_unknown, + { "Unknown", "fb_zero.puflags.unknown", + FT_UINT8, BASE_HEX, NULL, PUFLAGS_UNKN, + NULL, HFILL } + }, + + { &hf_fb_zero_version, + { "Version", "fb_zero.version", + FT_STRING, BASE_NONE, NULL, 0x0, + "32 bit opaque tag that represents the version of the ZB Zero (Always QTV)", HFILL } + }, + { &hf_fb_zero_length, + { "Length", "fb_zero.length", + FT_UINT32, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_tag, + { "Tag", "fb_zero.tag", + FT_STRING, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_tag_number, + { "Tag Number", "fb_zero.tag_number", + FT_UINT16, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_tags, + { "Tag/value", "fb_zero.tags", + FT_NONE, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_tag_type, + { "Tag Type", "fb_zero.tag_type", + FT_STRING, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_tag_offset_end, + { "Tag offset end", "fb_zero.tag_offset_end", + FT_UINT32, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_tag_length, + { "Tag length", "fb_zero.tag_offset_length", + FT_UINT32, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_tag_value, + { "Tag/value", "fb_zero.tag_value", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_tag_sni, + { "Server Name Indication", "fb_zero.tag.sni", + FT_STRING, BASE_NONE, NULL, 0x0, + "The fully qualified DNS name of the server, canonicalised to lowercase with no trailing period", HFILL } + }, + { &hf_fb_zero_tag_vers, + { "Version", "fb_zero.tag.version", + FT_STRING, BASE_NONE, NULL, 0x0, + "Version of FB Zero supported", HFILL } + }, + { &hf_fb_zero_tag_sno, + { "Server nonce", "fb_zero.tag.sno", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_tag_aead, + { "Authenticated encryption algorithms", "fb_zero.tag.aead", + FT_STRING, BASE_NONE, NULL, 0x0, + "A list of tags, in preference order, specifying the AEAD primitives supported by the server", HFILL } + }, + { &hf_fb_zero_tag_scid, + { "Server Config ID", "fb_zero.tag.scid", + FT_BYTES, BASE_NONE, NULL, 0x0, + "An opaque, 16-byte identifier for this server config", HFILL } + }, + { &hf_fb_zero_tag_time, + { "Time", "fb_zero.tag.time", + FT_UINT32, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_tag_alpn, + { "ALPN", "fb_zero.tag.alpn", + FT_STRING, BASE_NONE, NULL, 0x0, + "Application-Layer Protocol Negotiation supported", HFILL } + }, + { &hf_fb_zero_tag_pubs, + { "Public value", "fb_zero.tag.pubs", + FT_UINT24, BASE_DEC_HEX, NULL, 0x0, + "A list of public values, 24-bit, little-endian length prefixed", HFILL } + }, + { &hf_fb_zero_tag_kexs, + { "Key exchange algorithms", "fb_zero.tag.kexs", + FT_STRING, BASE_NONE, NULL, 0x0, + "A list of tags, in preference order, specifying the key exchange algorithms that the server supports", HFILL } + }, + { &hf_fb_zero_tag_nonc, + { "Client nonce", "fb_zero.tag.nonc", + FT_BYTES, BASE_NONE, NULL, 0x0, + "32 bytes consisting of 4 bytes of timestamp (big-endian, UNIX epoch seconds), 8 bytes of server orbit and 20 bytes of random data", HFILL } + }, + { &hf_fb_zero_tag_unknown, + { "Unknown tag", "fb_zero.tag.unknown", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_padding, + { "Padding", "fb_zero.padding", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_fb_zero_payload, + { "Payload", "fb_zero.payload", + FT_BYTES, BASE_NONE, NULL, 0x0, + "Fb Zero Payload..", HFILL } + }, + { &hf_fb_zero_unknown, + { "Unknown", "fb_zero.unknown", + FT_BYTES, BASE_NONE, NULL, 0x0, + "Unknown Data", HFILL } + }, + }; + + + static gint *ett[] = { + &ett_fb_zero, + &ett_fb_zero_puflags, + &ett_fb_zero_prflags, + &ett_fb_zero_ft, + &ett_fb_zero_ftflags, + &ett_fb_zero_tag_value + }; + + static ei_register_info ei[] = { + { &ei_fb_zero_tag_undecoded, { "fb_zero.tag.undecoded", PI_UNDECODED, PI_NOTE, "Dissector for FB Zero Tag code not implemented, Contact Wireshark developers if you want this supported", EXPFILL }}, + { &ei_fb_zero_tag_offset_end_invalid, { "fb_zero.offset_end.invalid", PI_PROTOCOL, PI_ERROR, "Invalid tag end offset", EXPFILL }}, + { &ei_fb_zero_length_invalid, { "fb_zero.length.invalid", PI_PROTOCOL, PI_WARN, "Invalid length", EXPFILL }}, + }; + + expert_module_t *expert_fb_zero; + + proto_fb_zero = proto_register_protocol("(Facebook) Zero Protocol", "FBZERO", "fb_zero"); + + fb_zero_handle = register_dissector("fb_zero", dissect_fb_zero, proto_fb_zero); + + proto_register_field_array(proto_fb_zero, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + expert_fb_zero = expert_register_protocol(proto_fb_zero); + expert_register_field_array(expert_fb_zero, ei, array_length(ei)); +} + +void +proto_reg_handoff_fb_zero(void) +{ + + heur_dissector_add("tcp", dissect_fb_zero_heur, "FBZero (QUIC) over TCP", "fb_zero", proto_fb_zero, HEURISTIC_ENABLE); + +} + + +/* + * Editor modelines - https://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 4 + * tab-width: 8 + * indent-tabs-mode: nil + * End: + * + * vi: set shiftwidth=4 tabstop=8 expandtab: + * :indentSize=4:tabSize=8:noTabs=true: + */ |