forked from osmocom/wireshark
![Bill Meier](/assets/img/avatar_default.png)
Specifically: - Set packet.h to be the first wireshark #include after config.h and "system" #includes. packet.h added as an #include in some cases when missing. - Remove some #includes included (directly/indirectly) in packet.h. E.g., glib.h. (Done only for those files including packet.h). - As needed, move "system" #includes to be after config.h and before wireshark #includes. - Rework various #include file specifications for consistency. - Misc. Change-Id: Ifaa1a14b50b69fbad38ea4838a49dfe595c54c95 Reviewed-on: https://code.wireshark.org/review/5923 Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com> Reviewed-by: Bill Meier <wmeier@newsguy.com>
1568 lines
54 KiB
C
1568 lines
54 KiB
C
/* packet-eap.c
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* Routines for EAP Extensible Authentication Protocol dissection
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* RFC 2284, RFC 3748
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/conversation.h>
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#include <epan/ppptypes.h>
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#include <epan/reassemble.h>
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#include <epan/eap.h>
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#include <epan/expert.h>
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#include "packet-wps.h"
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void proto_register_eap(void);
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void proto_reg_handoff_eap(void);
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static int proto_eap = -1;
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static int hf_eap_code = -1;
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static int hf_eap_identifier = -1;
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static int hf_eap_len = -1;
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static int hf_eap_type = -1;
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static int hf_eap_type_nak = -1;
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static int hf_eap_identity = -1;
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static int hf_eap_notification = -1;
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static int hf_eap_md5_value_size = -1;
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static int hf_eap_md5_value = -1;
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static int hf_eap_md5_extra_data = -1;
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static int hf_eap_sim_subtype = -1;
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static int hf_eap_sim_reserved = -1;
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static int hf_eap_sim_subtype_attribute = -1;
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static int hf_eap_sim_subtype_type = -1;
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static int hf_eap_sim_subtype_length = -1;
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static int hf_eap_sim_subtype_value = -1;
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static int hf_eap_aka_subtype = -1;
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static int hf_eap_aka_reserved = -1;
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static int hf_eap_aka_subtype_attribute = -1;
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static int hf_eap_aka_subtype_type = -1;
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static int hf_eap_aka_subtype_length = -1;
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static int hf_eap_aka_subtype_value = -1;
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static int hf_eap_leap_version = -1;
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static int hf_eap_leap_reserved = -1;
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static int hf_eap_leap_count = -1;
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static int hf_eap_leap_peer_challenge = -1;
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static int hf_eap_leap_peer_response = -1;
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static int hf_eap_leap_ap_challenge = -1;
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static int hf_eap_leap_ap_response = -1;
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static int hf_eap_leap_data = -1;
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static int hf_eap_leap_name = -1;
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static int hf_eap_ms_chap_v2_opcode = -1;
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static int hf_eap_ms_chap_v2_id = -1;
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static int hf_eap_ms_chap_v2_length = -1;
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static int hf_eap_ms_chap_v2_value_size = -1;
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static int hf_eap_ms_chap_v2_challenge = -1;
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static int hf_eap_ms_chap_v2_name = -1;
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static int hf_eap_ms_chap_v2_peer_challenge = -1;
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static int hf_eap_ms_chap_v2_reserved = -1;
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static int hf_eap_ms_chap_v2_nt_response = -1;
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static int hf_eap_ms_chap_v2_flags = -1;
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static int hf_eap_ms_chap_v2_response = -1;
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static int hf_eap_ms_chap_v2_message = -1;
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static int hf_eap_ms_chap_v2_failure_request = -1;
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static int hf_eap_ms_chap_v2_data = -1;
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static int hf_eap_data = -1;
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static gint ett_eap = -1;
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static expert_field ei_eap_ms_chap_v2_length = EI_INIT;
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static expert_field ei_eap_mitm_attacks = EI_INIT;
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static expert_field ei_eap_md5_value_size_overflow = EI_INIT;
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static expert_field ei_eap_dictionary_attacks = EI_INIT;
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static dissector_handle_t eap_handle;
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static dissector_handle_t ssl_handle;
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const value_string eap_code_vals[] = {
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{ EAP_REQUEST, "Request" },
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{ EAP_RESPONSE, "Response" },
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{ EAP_SUCCESS, "Success" },
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{ EAP_FAILURE, "Failure" },
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{ EAP_INITIATE, "Initiate" }, /* [RFC5296] */
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{ EAP_FINISH, "Finish" }, /* [RFC5296] */
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{ 0, NULL }
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};
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/*
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References:
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1) http://www.iana.org/assignments/ppp-numbers PPP EAP REQUEST/RESPONSE TYPES
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2) http://www.ietf.org/internet-drafts/draft-ietf-pppext-rfc2284bis-02.txt
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3) RFC2284
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4) RFC3748
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5) http://www.iana.org/assignments/eap-numbers EAP registry (updated 2011-02-22)
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6) http://tools.ietf.org/html/draft-bersani-eap-synthesis-sharedkeymethods-00
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*/
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static const value_string eap_type_vals[] = {
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{ 1, "Identity" },
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{ 2, "Notification" },
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{ 3, "Legacy Nak (Response Only)" },
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{ 4, "MD5-Challenge EAP (EAP-MD5-CHALLENGE)" },
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{ 5, "One-Time Password EAP (EAP-OTP)" },
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{ 6, "Generic Token Card EAP (EAP-GTC)" },
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{ 7, "Allocated" },
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{ 8, "Allocated" },
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{ 9, "RSA Public Key Authentication EAP (EAP-RSA-PKA)" },
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{ 10, "DSS Unilateral EAP (EAP-DSS)" },
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{ 11, "KEA EAP (EAP-KEA)" },
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{ 12, "KEA Validate EAP (EAP-KEA-VALIDATE)" },
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{ 13, "TLS EAP (EAP-TLS)" },
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{ 14, "Defender Token EAP (EAP-AXENT)" },
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{ 15, "RSA Security SecurID EAP (EAP-RSA-SECURID)" },
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{ 16, "Arcot Systems EAP (EAP-ARCOT-SYSTEMS)" },
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{ 17, "Cisco Wireless EAP / Lightweight EAP (EAP-LEAP)" },
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{ 18, "GSM Subscriber Identity Modules EAP (EAP-SIM)" },
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{ 19, "Secure Remote Password SHA1 Part 1 EAP (EAP-SRP-SHA1-PART1)" },
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{ 20, "Secure Remote Password SHA1 Part 2 EAP (EAP-SRP-SHA1-PART2)" },
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{ 21, "Tunneled TLS EAP (EAP-TTLS)" },
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{ 22, "Remote Access Service EAP (EAP-RAS)" },
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{ 23, "UMTS Authentication and Key Agreement EAP (EAP-AKA)" },
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{ 24, "3Com Wireless EAP (EAP-3COM-WIRELESS)" },
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{ 25, "Protected EAP (EAP-PEAP)" },
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{ 26, "MS-Authentication EAP (EAP-MS-AUTH)" },
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{ 27, "Mutual Authentication w/Key Exchange EAP (EAP-MAKE)" },
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{ 28, "CRYPTOCard EAP (EAP-CRYPTOCARD)" },
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{ 29, "MS-CHAP-v2 EAP (EAP-MS-CHAP-V2)" },
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{ 30, "DynamID EAP (EAP-DYNAMID)" },
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{ 31, "Rob EAP (EAP-ROB)" },
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{ 32, "Protected One-Time Password EAP (EAP-POTP)" },
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{ 33, "MS-Authentication TLV EAP (EAP-MS-AUTH-TLV)" },
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{ 34, "SentriNET (EAP-SENTRINET)" },
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{ 35, "Actiontec Wireless EAP (EAP-ACTIONTEC-WIRELESS)" },
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{ 36, "Cogent Systems Biometrics Authentication EAP (EAP-COGENT-BIOMETRIC)" },
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{ 37, "AirFortress EAP (EAP-AIRFORTRESS)" },
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{ 38, "HTTP Digest EAP (EAP-HTTP-DIGEST)" },
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{ 39, "SecureSuite EAP (EAP-SECURESUITE)" },
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{ 40, "DeviceConnect EAP (EAP-DEVICECONNECT)" },
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{ 41, "Simple Password Exponential Key Exchange EAP (EAP-SPEKE)" },
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{ 42, "MOBAC EAP (EAP-MOBAC)" },
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{ 43, "Flexible Authentication via Secure Tunneling EAP (EAP-FAST)" },
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{ 44, "ZoneLabs EAP (EAP-ZLXEAP)" },
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{ 45, "Link EAP (EAP-LINK)" },
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{ 46, "Password Authenticated eXchange EAP (EAP-PAX)" },
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{ 47, "Pre-Shared Key EAP (EAP-PSK)" },
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{ 48, "Shared-secret Authentication and Key Establishment EAP (EAP-SAKE)" },
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{ 49, "Internet Key Exchange v2 EAP (EAP-IKEv2)" },
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{ 50, "UMTS Authentication and Key Agreement' EAP (EAP-AKA')" },
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{ 51, "Generalized Pre-Shared Key EAP (EAP-GPSK)" },
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{ 52, "Password EAP (EAP-pwd)" },
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{ 53, "Encrypted Key Exchange v1 EAP (EAP-EKEv1)" },
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{ 254, "Expanded Type" },
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{ 255, "Experimental" },
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{ 0, NULL }
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};
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value_string_ext eap_type_vals_ext = VALUE_STRING_EXT_INIT(eap_type_vals);
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const value_string eap_sim_subtype_vals[] = {
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{ SIM_START, "Start" },
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{ SIM_CHALLENGE, "Challenge" },
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{ SIM_NOTIFICATION, "Notification" },
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{ SIM_RE_AUTHENTICATION, "Re-authentication" },
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{ SIM_CLIENT_ERROR, "Client-Error" },
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{ 0, NULL }
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};
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const value_string eap_aka_subtype_vals[] = {
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{ AKA_CHALLENGE, "AKA-Challenge" },
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{ AKA_AUTHENTICATION_REJECT, "AKA-Authentication-Reject" },
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{ AKA_SYNCHRONIZATION_FAILURE, "AKA-Synchronization-Failure" },
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{ AKA_IDENTITY, "AKA-Identity" },
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{ AKA_NOTIFICATION, "Notification" },
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{ AKA_REAUTHENTICATION, "Re-authentication" },
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{ AKA_CLIENT_ERROR, "Client-Error" },
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{ 0, NULL }
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};
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/*
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References:
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1) http://www.iana.org/assignments/eapsimaka-numbers/eapsimaka-numbers.xml
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3) RFC4186
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3) RFC4187
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4) RFC5448
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5) 3GPP TS 24.302
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*/
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static const value_string eap_sim_aka_attribute_vals[] = {
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{ 1, "AT_RAND" },
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{ 2, "AT_AUTN" },
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{ 3, "AT_RES" },
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{ 4, "AT_AUTS" },
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{ 6, "AT_PADDING" },
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{ 7, "AT_NONCE_MT" },
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{ 10, "AT_PERMANENT_ID_REQ" },
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{ 11, "AT_MAC" },
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{ 12, "AT_NOTIFICATION" },
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{ 13, "AT_ANY_ID_REQ" },
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{ 14, "AT_IDENTITY" },
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{ 15, "AT_VERSION_LIST" },
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{ 16, "AT_SELECTED_VERSION" },
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{ 17, "AT_FULLAUTH_ID_REQ" },
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{ 19, "AT_COUNTER" },
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{ 20, "AT_COUNTER_TOO_SMALL" },
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{ 21, "AT_NONCE_S" },
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{ 22, "AT_CLIENT_ERROR_CODE" },
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{ 23, "AT_KDF_INPUT"},
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{ 24, "AT_KDF"},
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{ 129, "AT_IV" },
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{ 130, "AT_ENCR_DATA" },
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{ 132, "AT_NEXT_PSEUDONYM" },
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{ 133, "AT_NEXT_REAUTH_ID" },
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{ 134, "AT_CHECKCODE" },
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{ 135, "AT_RESULT_IND" },
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{ 136, "AT_BIDDING" },
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{ 137, "AT_IPMS_IND" },
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{ 138, "AT_IPMS_RES" },
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{ 139, "AT_TRUST_IND" },
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{ 0, NULL }
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};
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value_string_ext eap_sim_aka_attribute_vals_ext = VALUE_STRING_EXT_INIT(eap_sim_aka_attribute_vals);
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const value_string eap_ms_chap_v2_opcode_vals[] = {
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{ MS_CHAP_V2_CHALLENGE, "Challenge" },
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{ MS_CHAP_V2_RESPONSE, "Response" },
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{ MS_CHAP_V2_SUCCESS, "Success" },
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{ MS_CHAP_V2_FAILURE, "Failure" },
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{ MS_CHAP_V2_CHANGE_PASSWORD, "Change-Password" },
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{ 0, NULL }
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};
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/*
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* State information for EAP-TLS (RFC2716) and Lightweight EAP:
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*
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* http://www.missl.cs.umd.edu/wireless/ethereal/leap.txt
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*
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* Attach to all conversations:
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*
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* a sequence number to be handed to "fragment_add_seq()" as
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* the fragment sequence number - if it's -1, no reassembly
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* is in progress, but if it's not, it's the sequence number
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* to use for the current fragment;
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*
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* a value to be handed to "fragment_add_seq()" as the
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* reassembly ID - when a reassembly is started, it's set to
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* the frame number of the current frame, i.e. the frame
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* that starts the reassembly;
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*
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* an indication of the current state of LEAP negotiation,
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* with -1 meaning no LEAP negotiation is in progress.
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*
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* Attach to frames containing fragments of EAP-TLS messages the
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* reassembly ID for those fragments, so we can find the reassembled
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* data after the first pass through the packets.
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*
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* Attach to LEAP frames the state of the LEAP negotiation when the
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* frame was processed, so we can properly dissect
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* the LEAP message after the first pass through the packets.
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*
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* Attach to all conversations both pieces of information, to keep
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* track of EAP-TLS reassembly and the LEAP state machine.
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*/
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typedef struct {
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int eap_tls_seq;
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guint32 eap_reass_cookie;
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int leap_state;
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} conv_state_t;
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typedef struct {
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int info; /* interpretation depends on EAP message type */
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} frame_state_t;
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/*********************************************************************
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EAP-TLS
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RFC2716
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**********************************************************************/
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/*
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from RFC2716, pg 17
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Flags
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0 1 2 3 4 5 6 7 8
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+-+-+-+-+-+-+-+-+
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|L M S R R Vers |
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+-+-+-+-+-+-+-+-+
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L = Length included
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M = More fragments
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S = EAP-TLS start
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R = Reserved
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Vers = PEAP version (Reserved for TLS and TTLS)
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*/
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#define EAP_TLS_FLAG_L 0x80 /* Length included */
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#define EAP_TLS_FLAG_M 0x40 /* More fragments */
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#define EAP_TLS_FLAG_S 0x20 /* EAP-TLS start */
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#define EAP_TLS_FLAGS_VERSION 0x07 /* Version mask for PEAP, TTLS, FAST */
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/*
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* reassembly of EAP-TLS
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*/
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static reassembly_table eap_tls_reassembly_table;
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static int hf_eap_tls_flags = -1;
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static int hf_eap_tls_flag_l = -1;
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static int hf_eap_tls_flag_m = -1;
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static int hf_eap_tls_flag_s = -1;
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static int hf_eap_tls_flags_version = -1;
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static int hf_eap_tls_len = -1;
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static int hf_eap_tls_fragment = -1;
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static int hf_eap_tls_fragments = -1;
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static int hf_eap_tls_fragment_overlap = -1;
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static int hf_eap_tls_fragment_overlap_conflict = -1;
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static int hf_eap_tls_fragment_multiple_tails = -1;
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static int hf_eap_tls_fragment_too_long_fragment = -1;
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static int hf_eap_tls_fragment_error = -1;
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static int hf_eap_tls_fragment_count = -1;
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static int hf_eap_tls_reassembled_length = -1;
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static gint ett_eap_tls_fragment = -1;
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static gint ett_eap_tls_fragments = -1;
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static gint ett_eap_sim_attr = -1;
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static gint ett_eap_aka_attr = -1;
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static gint ett_eap_exp_attr = -1;
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static gint ett_eap_tls_flags = -1;
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static const fragment_items eap_tls_frag_items = {
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&ett_eap_tls_fragment,
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&ett_eap_tls_fragments,
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&hf_eap_tls_fragments,
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&hf_eap_tls_fragment,
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&hf_eap_tls_fragment_overlap,
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&hf_eap_tls_fragment_overlap_conflict,
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&hf_eap_tls_fragment_multiple_tails,
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&hf_eap_tls_fragment_too_long_fragment,
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&hf_eap_tls_fragment_error,
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&hf_eap_tls_fragment_count,
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NULL,
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&hf_eap_tls_reassembled_length,
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/* Reassembled data field */
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NULL,
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"fragments"
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};
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/**********************************************************************
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Support for EAP Expanded Type.
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Currently this is limited to WifiProtectedSetup. Maybe we need
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a generic method to support EAP extended types ?
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*********************************************************************/
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static int hf_eap_ext_vendor_id = -1;
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static int hf_eap_ext_vendor_type = -1;
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/* Vendor-Type and Vendor-id */
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#define WFA_VENDOR_ID 0x00372A
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#define WFA_SIMPLECONFIG_TYPE 0x1
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static const value_string eap_ext_vendor_id_vals[] = {
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{ WFA_VENDOR_ID, "WFA" },
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{ 0, NULL }
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};
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static const value_string eap_ext_vendor_type_vals[] = {
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{ WFA_SIMPLECONFIG_TYPE, "SimpleConfig" },
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{ 0, NULL }
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};
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static void
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dissect_exteap(proto_tree *eap_tree, tvbuff_t *tvb, int offset,
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gint size, packet_info* pinfo)
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{
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proto_tree_add_item(eap_tree, hf_eap_ext_vendor_id, tvb, offset, 3, ENC_BIG_ENDIAN);
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offset += 3;
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size -= 3;
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proto_tree_add_item(eap_tree, hf_eap_ext_vendor_type, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
|
|
size -= 4;
|
|
|
|
/* Generic method to support multiple vendor-defined extended types goes here :-) */
|
|
dissect_exteap_wps(eap_tree, tvb, offset, size, pinfo);
|
|
}
|
|
/* *********************************************************************
|
|
********************************************************************* */
|
|
|
|
static gboolean
|
|
test_flag(unsigned char flag, unsigned char mask)
|
|
{
|
|
return ( ( flag & mask ) != 0 );
|
|
}
|
|
|
|
static void
|
|
eap_tls_defragment_init(void)
|
|
{
|
|
reassembly_table_init(&eap_tls_reassembly_table,
|
|
&addresses_reassembly_table_functions);
|
|
}
|
|
|
|
static void
|
|
dissect_eap_mschapv2(proto_tree *eap_tree, tvbuff_t *tvb, packet_info *pinfo, int offset,
|
|
gint size)
|
|
{
|
|
proto_item *item;
|
|
gint left = size;
|
|
gint ms_len;
|
|
guint8 value_size;
|
|
guint8 opcode;
|
|
|
|
/* OpCode (1 byte), MS-CHAPv2-ID (1 byte), MS-Length (2 bytes), Data */
|
|
opcode = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_opcode, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
left -= 1;
|
|
if (left <= 0)
|
|
return;
|
|
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_id, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
left -= 1;
|
|
if (left <= 0)
|
|
return;
|
|
|
|
item = proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_length, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
ms_len = tvb_get_ntohs(tvb, offset);
|
|
if (ms_len != size)
|
|
expert_add_info(pinfo, item, &ei_eap_ms_chap_v2_length);
|
|
offset += 2;
|
|
left -= 2;
|
|
|
|
switch (opcode) {
|
|
case MS_CHAP_V2_CHALLENGE:
|
|
if (left <= 0)
|
|
break;
|
|
value_size = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_value_size,
|
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
left -= 1;
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_challenge,
|
|
tvb, offset, value_size, ENC_NA);
|
|
offset += value_size;
|
|
left -= value_size;
|
|
if (left <= 0)
|
|
break;
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_name,
|
|
tvb, offset, left, ENC_ASCII|ENC_NA);
|
|
break;
|
|
case MS_CHAP_V2_RESPONSE:
|
|
if (left <= 0)
|
|
break;
|
|
value_size = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_value_size,
|
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
left -= 1;
|
|
if (value_size == 49) {
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_peer_challenge,
|
|
tvb, offset, 16, ENC_NA);
|
|
offset += 16;
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_reserved,
|
|
tvb, offset, 8, ENC_NA);
|
|
offset += 8;
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_nt_response,
|
|
tvb, offset, 24, ENC_NA);
|
|
offset += 24;
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_flags,
|
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
left -= value_size;
|
|
} else {
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_response, tvb, offset, value_size, ENC_NA);
|
|
offset += value_size;
|
|
left -= value_size;
|
|
}
|
|
if (left <= 0)
|
|
break;
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_name, tvb, offset, left, ENC_ASCII|ENC_NA);
|
|
break;
|
|
case MS_CHAP_V2_SUCCESS:
|
|
if (left <= 0)
|
|
break;
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_message,
|
|
tvb, offset, left, ENC_ASCII|ENC_NA);
|
|
break;
|
|
case MS_CHAP_V2_FAILURE:
|
|
if (left <= 0)
|
|
break;
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_failure_request,
|
|
tvb, offset, left, ENC_ASCII|ENC_NA);
|
|
break;
|
|
default:
|
|
proto_tree_add_item(eap_tree, hf_eap_ms_chap_v2_data, tvb, offset, left, ENC_NA);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_eap_sim(proto_tree *eap_tree, tvbuff_t *tvb, int offset, gint size)
|
|
{
|
|
gint left = size;
|
|
|
|
proto_tree_add_item(eap_tree, hf_eap_sim_subtype, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
offset += 1;
|
|
left -= 1;
|
|
|
|
if (left < 2)
|
|
return;
|
|
proto_tree_add_item(eap_tree, hf_eap_sim_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
left -= 2;
|
|
|
|
/* Rest of EAP-SIM data is in Type-Len-Value format. */
|
|
while (left >= 2) {
|
|
guint8 type, length;
|
|
proto_item *pi;
|
|
proto_tree *attr_tree;
|
|
int aoffset;
|
|
gint aleft;
|
|
|
|
aoffset = offset;
|
|
type = tvb_get_guint8(tvb, aoffset);
|
|
length = tvb_get_guint8(tvb, aoffset + 1);
|
|
aleft = 4 * length;
|
|
|
|
pi = proto_tree_add_none_format(eap_tree, hf_eap_sim_subtype_attribute, tvb,
|
|
aoffset, aleft, "EAP-SIM Attribute: %s (%d)",
|
|
val_to_str_ext_const(type,
|
|
&eap_sim_aka_attribute_vals_ext,
|
|
"Unknown"),
|
|
type);
|
|
attr_tree = proto_item_add_subtree(pi, ett_eap_sim_attr);
|
|
proto_tree_add_uint(attr_tree, hf_eap_sim_subtype_type, tvb, aoffset, 1, type);
|
|
aoffset += 1;
|
|
aleft -= 1;
|
|
|
|
if (aleft <= 0)
|
|
break;
|
|
proto_tree_add_item(attr_tree, hf_eap_sim_subtype_length, tvb, aoffset, 1, ENC_BIG_ENDIAN);
|
|
aoffset += 1;
|
|
aleft -= 1;
|
|
proto_tree_add_item(attr_tree, hf_eap_sim_subtype_value, tvb, aoffset, aleft, ENC_NA);
|
|
|
|
offset += 4 * length;
|
|
left -= 4 * length;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_eap_aka(proto_tree *eap_tree, tvbuff_t *tvb, int offset, gint size)
|
|
{
|
|
gint left = size;
|
|
proto_tree_add_item(eap_tree, hf_eap_aka_subtype, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
offset += 1;
|
|
left -= 1;
|
|
|
|
if (left < 2)
|
|
return;
|
|
proto_tree_add_item(eap_tree, hf_eap_aka_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
left -= 2;
|
|
|
|
/* Rest of EAP-AKA data is in Type-Len-Value format. */
|
|
while (left >= 2) {
|
|
guint8 type, length;
|
|
proto_item *pi;
|
|
proto_tree *attr_tree;
|
|
int aoffset;
|
|
gint aleft;
|
|
|
|
aoffset = offset;
|
|
type = tvb_get_guint8(tvb, aoffset);
|
|
length = tvb_get_guint8(tvb, aoffset + 1);
|
|
aleft = 4 * length;
|
|
|
|
pi = proto_tree_add_none_format(eap_tree, hf_eap_aka_subtype_attribute, tvb,
|
|
aoffset, aleft, "EAP-AKA Attribute: %s (%d)",
|
|
val_to_str_ext_const(type,
|
|
&eap_sim_aka_attribute_vals_ext,
|
|
"Unknown"),
|
|
type);
|
|
attr_tree = proto_item_add_subtree(pi, ett_eap_aka_attr);
|
|
proto_tree_add_uint(attr_tree, hf_eap_aka_subtype_type, tvb, aoffset, 1, type);
|
|
aoffset += 1;
|
|
aleft -= 1;
|
|
|
|
if (aleft <= 0)
|
|
break;
|
|
proto_tree_add_item(attr_tree, hf_eap_aka_subtype_length, tvb, aoffset, 1, ENC_BIG_ENDIAN);
|
|
aoffset += 1;
|
|
aleft -= 1;
|
|
proto_tree_add_item(attr_tree, hf_eap_aka_subtype_value, tvb, aoffset, aleft, ENC_NA);
|
|
|
|
offset += 4 * length;
|
|
left -= 4 * length;
|
|
}
|
|
}
|
|
|
|
static int
|
|
dissect_eap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
|
|
{
|
|
guint8 eap_code;
|
|
guint16 eap_len;
|
|
guint8 eap_type;
|
|
gint len;
|
|
conversation_t *conversation;
|
|
conv_state_t *conversation_state;
|
|
frame_state_t *packet_state;
|
|
int leap_state;
|
|
proto_tree *ti;
|
|
proto_tree *eap_tree = NULL;
|
|
proto_tree *eap_tls_flags_tree = NULL;
|
|
proto_item *eap_type_item = NULL;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "EAP");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
eap_code = tvb_get_guint8(tvb, 0);
|
|
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str(eap_code, eap_code_vals, "Unknown code (0x%02X)"));
|
|
|
|
/*
|
|
* Find a conversation to which we belong; create one if we don't find
|
|
* it.
|
|
*
|
|
* We use the source and destination addresses, and the *matched* port
|
|
* number, because if this is running over RADIUS, there's no guarantee
|
|
* that the source port number for request and the destination port
|
|
* number for replies will be the same in all messages - the client
|
|
* may use different port numbers for each request.
|
|
*
|
|
* We have to pair up the matched port number with the corresponding
|
|
* address; we determine which that is by comparing it with the
|
|
* destination port - if it matches, we matched on the destination
|
|
* port (this is a request), otherwise we matched on the source port
|
|
* (this is a reply).
|
|
*
|
|
* XXX - what if we're running over a TCP or UDP protocol with a
|
|
* heuristic dissector, meaning the matched port number won't be set?
|
|
*
|
|
* XXX - what if we have a capture file with captures on multiple
|
|
* PPP interfaces, with LEAP traffic on all of them? How can we
|
|
* keep them separate? (Or is that not going to happen?)
|
|
*/
|
|
if (pinfo->destport == pinfo->match_uint) {
|
|
conversation = find_conversation(pinfo->fd->num, &pinfo->dst, &pinfo->src,
|
|
pinfo->ptype, pinfo->destport,
|
|
0, NO_PORT_B);
|
|
} else {
|
|
conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
|
|
pinfo->ptype, pinfo->srcport,
|
|
0, NO_PORT_B);
|
|
}
|
|
if (conversation == NULL) {
|
|
if (pinfo->destport == pinfo->match_uint) {
|
|
conversation = conversation_new(pinfo->fd->num, &pinfo->dst, &pinfo->src,
|
|
pinfo->ptype, pinfo->destport,
|
|
0, NO_PORT2);
|
|
} else {
|
|
conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst,
|
|
pinfo->ptype, pinfo->srcport,
|
|
0, NO_PORT2);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get the state information for the conversation; attach some if
|
|
* we don't find it.
|
|
*/
|
|
conversation_state = (conv_state_t *)conversation_get_proto_data(conversation, proto_eap);
|
|
if (conversation_state == NULL) {
|
|
/*
|
|
* Attach state information to the conversation.
|
|
*/
|
|
conversation_state = wmem_new(wmem_file_scope(), conv_state_t);
|
|
conversation_state->eap_tls_seq = -1;
|
|
conversation_state->eap_reass_cookie = 0;
|
|
conversation_state->leap_state = -1;
|
|
conversation_add_proto_data(conversation, proto_eap, conversation_state);
|
|
}
|
|
|
|
/*
|
|
* Set this now, so that it gets remembered even if we throw an exception
|
|
* later.
|
|
*/
|
|
if (eap_code == EAP_FAILURE)
|
|
conversation_state->leap_state = -1;
|
|
|
|
eap_len = tvb_get_ntohs(tvb, 2);
|
|
len = eap_len;
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_eap, tvb, 0, len, ENC_NA);
|
|
eap_tree = proto_item_add_subtree(ti, ett_eap);
|
|
|
|
proto_tree_add_item(eap_tree, hf_eap_code, tvb, 0, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(eap_tree, hf_eap_identifier, tvb, 1, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(eap_tree, hf_eap_len, tvb, 2, 2, ENC_BIG_ENDIAN);
|
|
}
|
|
|
|
switch (eap_code) {
|
|
|
|
case EAP_SUCCESS:
|
|
case EAP_FAILURE:
|
|
break;
|
|
|
|
case EAP_REQUEST:
|
|
case EAP_RESPONSE:
|
|
eap_type = tvb_get_guint8(tvb, 4);
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
|
|
val_to_str_ext(eap_type, &eap_type_vals_ext,
|
|
"Unknown type (0x%02x)"));
|
|
if (tree)
|
|
eap_type_item = proto_tree_add_item(eap_tree, hf_eap_type, tvb, 4, 1, ENC_BIG_ENDIAN);
|
|
|
|
if ((len > 5) || ((len == 5) && (eap_type == EAP_TYPE_ID))) {
|
|
int offset = 5;
|
|
gint size = len - offset;
|
|
|
|
switch (eap_type) {
|
|
/*********************************************************************
|
|
**********************************************************************/
|
|
case EAP_TYPE_ID:
|
|
if (tree) {
|
|
proto_tree_add_item(eap_tree, hf_eap_identity, tvb, offset, size, ENC_ASCII|ENC_NA);
|
|
}
|
|
if(!pinfo->fd->flags.visited) {
|
|
conversation_state->leap_state = 0;
|
|
conversation_state->eap_tls_seq = -1;
|
|
}
|
|
break;
|
|
|
|
/*********************************************************************
|
|
**********************************************************************/
|
|
case EAP_TYPE_NOTIFY:
|
|
if (tree) {
|
|
proto_tree_add_item(eap_tree, hf_eap_notification, tvb,
|
|
offset, size, ENC_ASCII|ENC_NA);
|
|
}
|
|
break;
|
|
|
|
/*********************************************************************
|
|
**********************************************************************/
|
|
case EAP_TYPE_NAK:
|
|
if (tree) {
|
|
proto_tree_add_item(eap_tree, hf_eap_type_nak, tvb,
|
|
offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
break;
|
|
/*********************************************************************
|
|
**********************************************************************/
|
|
case EAP_TYPE_MD5:
|
|
{
|
|
guint8 value_size = tvb_get_guint8(tvb, offset);
|
|
gint extra_len = size - 1 - value_size;
|
|
proto_item *item;
|
|
|
|
/* Warn that this is an insecure EAP type. */
|
|
expert_add_info(pinfo, eap_type_item, &ei_eap_mitm_attacks);
|
|
|
|
item = proto_tree_add_item(eap_tree, hf_eap_md5_value_size, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
if (value_size > (size - 1))
|
|
{
|
|
expert_add_info(pinfo, item, &ei_eap_md5_value_size_overflow);
|
|
value_size = size - 1;
|
|
}
|
|
|
|
offset += 1;
|
|
proto_tree_add_item(eap_tree, hf_eap_md5_value, tvb, offset, value_size, ENC_NA);
|
|
offset += value_size;
|
|
if (extra_len > 0) {
|
|
proto_tree_add_item(eap_tree, hf_eap_md5_extra_data, tvb, offset, extra_len, ENC_NA);
|
|
}
|
|
}
|
|
break;
|
|
|
|
/*********************************************************************
|
|
EAP-TLS
|
|
**********************************************************************/
|
|
case EAP_TYPE_FAST:
|
|
case EAP_TYPE_PEAP:
|
|
case EAP_TYPE_TTLS:
|
|
case EAP_TYPE_TLS:
|
|
{
|
|
guint8 flags = tvb_get_guint8(tvb, offset);
|
|
gboolean more_fragments;
|
|
gboolean has_length;
|
|
gboolean is_start;
|
|
int eap_tls_seq = -1;
|
|
guint32 eap_reass_cookie = 0;
|
|
gboolean needs_reassembly = FALSE;
|
|
|
|
more_fragments = test_flag(flags,EAP_TLS_FLAG_M);
|
|
has_length = test_flag(flags,EAP_TLS_FLAG_L);
|
|
is_start = test_flag(flags,EAP_TLS_FLAG_S);
|
|
|
|
if (is_start)
|
|
conversation_state->eap_tls_seq = -1;
|
|
|
|
/* Flags field, 1 byte */
|
|
if (tree) {
|
|
ti = proto_tree_add_item(eap_tree, hf_eap_tls_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
eap_tls_flags_tree = proto_item_add_subtree(ti, ett_eap_tls_flags);
|
|
proto_tree_add_item(eap_tls_flags_tree, hf_eap_tls_flag_l, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(eap_tls_flags_tree, hf_eap_tls_flag_m, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(eap_tls_flags_tree, hf_eap_tls_flag_s, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
if ((eap_type == EAP_TYPE_PEAP) || (eap_type == EAP_TYPE_TTLS) ||
|
|
(eap_type == EAP_TYPE_FAST)) {
|
|
proto_tree_add_item(eap_tls_flags_tree, hf_eap_tls_flags_version, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
}
|
|
size -= 1;
|
|
offset += 1;
|
|
|
|
/* Length field, 4 bytes, OPTIONAL. */
|
|
if (has_length) {
|
|
if (tree)
|
|
proto_tree_add_item(eap_tree, hf_eap_tls_len, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
size -= 4;
|
|
offset += 4;
|
|
}
|
|
|
|
if (size > 0) {
|
|
|
|
tvbuff_t *next_tvb;
|
|
gint tvb_len;
|
|
gboolean save_fragmented;
|
|
|
|
tvb_len = tvb_length_remaining(tvb, offset);
|
|
if (size < tvb_len)
|
|
tvb_len = size;
|
|
|
|
/*
|
|
EAP/TLS is weird protocol (it comes from
|
|
Microsoft after all).
|
|
|
|
If we have series of fragmented packets,
|
|
then there's no way of knowing that from
|
|
the packet itself, if it is the last packet
|
|
in series, that is that the packet part of
|
|
bigger fragmented set of data.
|
|
|
|
The only way to know is, by knowing
|
|
that we are already in defragmentation
|
|
"mode" and we are expecing packet
|
|
carrying fragment of data. (either
|
|
because we have not received expected
|
|
amount of data, or because the packet before
|
|
had "F"ragment flag set.)
|
|
|
|
The situation is alleviated by fact that it
|
|
is simple ack/nack protcol so there's no
|
|
place for out-of-order packets like it is
|
|
possible with IP.
|
|
|
|
Anyway, point of this lengthy essay is that
|
|
we have to keep state information in the
|
|
conversation, so that we can put ourselves in
|
|
defragmenting mode and wait for the last packet,
|
|
and have to attach state to frames as well, so
|
|
that we can handle defragmentation after the
|
|
first pass through the capture.
|
|
*/
|
|
/* See if we have a remembered defragmentation EAP ID. */
|
|
packet_state = (frame_state_t *)p_get_proto_data(wmem_file_scope(), pinfo, proto_eap, 0);
|
|
if (packet_state == NULL) {
|
|
/*
|
|
* We haven't - does this message require reassembly?
|
|
*/
|
|
if (!pinfo->fd->flags.visited) {
|
|
/*
|
|
* This is the first time we've looked at this frame,
|
|
* so it wouldn't have any remembered information.
|
|
*
|
|
* Therefore, we check whether this conversation has
|
|
* a reassembly operation in progress, or whether
|
|
* this frame has the Fragment flag set.
|
|
*/
|
|
if (conversation_state->eap_tls_seq != -1) {
|
|
/*
|
|
* There's a reassembly in progress; the sequence number
|
|
* of the previous fragment is
|
|
* "conversation_state->eap_tls_seq", and the reassembly
|
|
* ID is "conversation_state->eap_reass_cookie".
|
|
*
|
|
* We must include this frame in the reassembly.
|
|
* We advance the sequence number, giving us the
|
|
* sequence number for this fragment.
|
|
*/
|
|
needs_reassembly = TRUE;
|
|
conversation_state->eap_tls_seq++;
|
|
|
|
eap_reass_cookie = conversation_state->eap_reass_cookie;
|
|
eap_tls_seq = conversation_state->eap_tls_seq;
|
|
} else if (more_fragments && has_length) {
|
|
/*
|
|
* This message has the Fragment flag set, so it requires
|
|
* reassembly. It's the message containing the first
|
|
* fragment (if it's a later fragment, the sequence
|
|
* number in the conversation state would not be -1).
|
|
*
|
|
* If it doesn't include a length, however, we can't
|
|
* do reassembly (either the message is in error, as
|
|
* the first fragment *must* contain a length, or we
|
|
* didn't capture the first fragment, and this just
|
|
* happens to be the first fragment we saw), so we
|
|
* also check that we have a length;
|
|
*/
|
|
needs_reassembly = TRUE;
|
|
conversation_state->eap_reass_cookie = pinfo->fd->num;
|
|
|
|
/*
|
|
* Start the reassembly sequence number at 0.
|
|
*/
|
|
conversation_state->eap_tls_seq = 0;
|
|
|
|
eap_tls_seq = conversation_state->eap_tls_seq;
|
|
eap_reass_cookie = conversation_state->eap_reass_cookie;
|
|
}
|
|
|
|
if (needs_reassembly) {
|
|
/*
|
|
* This frame requires reassembly; remember the reassembly
|
|
* ID for subsequent accesses to it.
|
|
*/
|
|
packet_state = wmem_new(wmem_file_scope(), frame_state_t);
|
|
packet_state->info = eap_reass_cookie;
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_eap, 0, packet_state);
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* This frame has a reassembly cookie associated with it, so
|
|
* it requires reassembly. We've already done the
|
|
* reassembly in the first pass, so "fragment_add_seq()"
|
|
* won't look at the sequence number; set it to 0.
|
|
*
|
|
* XXX - a frame isn't supposed to have more than one
|
|
* EAP message in it, but if it includes both an EAP-TLS
|
|
* message and a LEAP message, we might be mistakenly
|
|
* concluding it requires reassembly because the "info"
|
|
* field isn't -1. We could, I guess, pack both EAP-TLS
|
|
* ID and LEAP state into the structure, but that doesn't
|
|
* work if you have multiple EAP-TLS or LEAP messages in
|
|
* the frame.
|
|
*
|
|
* But it's not clear how much work we should do to handle
|
|
* a bogus message such as that; as long as we don't crash
|
|
* or do something else equally horrible, we may not
|
|
* have to worry about this at all.
|
|
*/
|
|
needs_reassembly = TRUE;
|
|
eap_reass_cookie = packet_state->info;
|
|
eap_tls_seq = 0;
|
|
}
|
|
|
|
/*
|
|
We test here to see whether EAP-TLS packet
|
|
carry fragmented of TLS data.
|
|
|
|
If this is the case, we do reasembly below,
|
|
otherwise we just call dissector.
|
|
*/
|
|
if (needs_reassembly) {
|
|
fragment_head *fd_head;
|
|
|
|
/*
|
|
* Yes, this frame contains a fragment that requires
|
|
* reassembly.
|
|
*/
|
|
save_fragmented = pinfo->fragmented;
|
|
pinfo->fragmented = TRUE;
|
|
fd_head = fragment_add_seq(&eap_tls_reassembly_table,
|
|
tvb, offset,
|
|
pinfo, eap_reass_cookie, NULL,
|
|
eap_tls_seq,
|
|
size,
|
|
more_fragments, 0);
|
|
|
|
if (fd_head != NULL) /* Reassembled */
|
|
{
|
|
proto_item *frag_tree_item;
|
|
|
|
next_tvb = tvb_new_chain(tvb, fd_head->tvb_data);
|
|
add_new_data_source(pinfo, next_tvb, "Reassembled EAP-TLS");
|
|
|
|
show_fragment_seq_tree(fd_head, &eap_tls_frag_items,
|
|
eap_tree, pinfo, next_tvb, &frag_tree_item);
|
|
|
|
call_dissector(ssl_handle, next_tvb, pinfo, eap_tree);
|
|
|
|
/*
|
|
* We're finished reassembing this frame.
|
|
* Reinitialize the reassembly state.
|
|
*/
|
|
if (!pinfo->fd->flags.visited)
|
|
conversation_state->eap_tls_seq = -1;
|
|
}
|
|
|
|
pinfo->fragmented = save_fragmented;
|
|
|
|
} else { /* this data is NOT fragmented */
|
|
next_tvb = tvb_new_subset(tvb, offset, tvb_len, size);
|
|
call_dissector(ssl_handle, next_tvb, pinfo, eap_tree);
|
|
}
|
|
}
|
|
}
|
|
break; /* EAP_TYPE_TLS */
|
|
|
|
/*********************************************************************
|
|
Cisco's Lightweight EAP (LEAP)
|
|
http://www.missl.cs.umd.edu/wireless/ethereal/leap.txt
|
|
**********************************************************************/
|
|
case EAP_TYPE_LEAP:
|
|
{
|
|
guint8 count, namesize;
|
|
|
|
/* Warn that this is an insecure EAP type. */
|
|
expert_add_info(pinfo, eap_type_item, &ei_eap_dictionary_attacks);
|
|
|
|
/* Version (byte) */
|
|
if (tree) {
|
|
proto_tree_add_item(eap_tree, hf_eap_leap_version, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
offset += 1;
|
|
|
|
/* Unused (byte) */
|
|
if (tree) {
|
|
proto_tree_add_item(eap_tree, hf_eap_leap_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
offset += 1;
|
|
|
|
/* Count (byte) */
|
|
count = tvb_get_guint8(tvb, offset);
|
|
if (tree) {
|
|
proto_tree_add_item(eap_tree, hf_eap_leap_count, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
offset += 1;
|
|
|
|
/* Data (byte*Count) */
|
|
/* This part is state-dependent. */
|
|
|
|
/* See if we've already remembered the state. */
|
|
packet_state = (frame_state_t *)p_get_proto_data(wmem_file_scope(), pinfo, proto_eap, 0);
|
|
if (packet_state == NULL) {
|
|
/*
|
|
* We haven't - compute the state based on the current
|
|
* state in the conversation.
|
|
*/
|
|
leap_state = conversation_state->leap_state;
|
|
|
|
/* Advance the state machine. */
|
|
if (leap_state==0) leap_state = 1; else
|
|
if (leap_state==1) leap_state = 2; else
|
|
if (leap_state==2) leap_state = 3; else
|
|
if (leap_state==3) leap_state = 4; else
|
|
if (leap_state==4) leap_state = -1;
|
|
|
|
/*
|
|
* Remember the state for subsequent accesses to this
|
|
* frame.
|
|
*/
|
|
packet_state = wmem_new(wmem_file_scope(), frame_state_t);
|
|
packet_state->info = leap_state;
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_eap, 0, packet_state);
|
|
|
|
/*
|
|
* Update the conversation's state.
|
|
*/
|
|
conversation_state->leap_state = leap_state;
|
|
}
|
|
|
|
/* Get the remembered state. */
|
|
leap_state = packet_state->info;
|
|
|
|
if (tree) {
|
|
switch (leap_state) {
|
|
case 1:
|
|
proto_tree_add_item(eap_tree, hf_eap_leap_peer_challenge, tvb, offset, count, ENC_NA);
|
|
break;
|
|
|
|
case 2:
|
|
proto_tree_add_item(eap_tree, hf_eap_leap_peer_response, tvb, offset, count, ENC_NA);
|
|
break;
|
|
|
|
case 3:
|
|
proto_tree_add_item(eap_tree, hf_eap_leap_ap_challenge, tvb, offset, count, ENC_NA);
|
|
break;
|
|
|
|
case 4:
|
|
proto_tree_add_item(eap_tree, hf_eap_leap_ap_response, tvb, offset, count, ENC_NA);
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_item(eap_tree, hf_eap_leap_data, tvb, offset, count, ENC_NA);
|
|
break;
|
|
}
|
|
}
|
|
|
|
offset += count;
|
|
|
|
/* Name (Length-(8+Count)) */
|
|
namesize = eap_len - (8+count);
|
|
if (tree) {
|
|
proto_tree_add_item(eap_tree, hf_eap_leap_name, tvb, offset, namesize, ENC_ASCII|ENC_NA);
|
|
}
|
|
}
|
|
|
|
break; /* EAP_TYPE_LEAP */
|
|
|
|
/*********************************************************************
|
|
EAP-MSCHAPv2 - draft-kamath-pppext-eap-mschapv2-00.txt
|
|
**********************************************************************/
|
|
case EAP_TYPE_MSCHAPV2:
|
|
dissect_eap_mschapv2(eap_tree, tvb, pinfo, offset, size);
|
|
break; /* EAP_TYPE_MSCHAPV2 */
|
|
|
|
/*********************************************************************
|
|
EAP-SIM - draft-haverinen-pppext-eap-sim-13.txt
|
|
**********************************************************************/
|
|
case EAP_TYPE_SIM:
|
|
if (tree)
|
|
dissect_eap_sim(eap_tree, tvb, offset, size);
|
|
break; /* EAP_TYPE_SIM */
|
|
|
|
/*********************************************************************
|
|
EAP-AKA - draft-arkko-pppext-eap-aka-12.txt
|
|
**********************************************************************/
|
|
case EAP_TYPE_AKA:
|
|
case EAP_TYPE_AKA_PRIME:
|
|
if (tree)
|
|
dissect_eap_aka(eap_tree, tvb, offset, size);
|
|
break; /* EAP_TYPE_AKA */
|
|
|
|
/*********************************************************************
|
|
EAP Expanded Type
|
|
**********************************************************************/
|
|
case EAP_TYPE_EXT:
|
|
{
|
|
proto_tree *exptree;
|
|
|
|
exptree = proto_tree_add_subtree(eap_tree, tvb, offset, size, ett_eap_exp_attr, NULL, "Expanded Type");
|
|
dissect_exteap(exptree, tvb, offset, size, pinfo);
|
|
}
|
|
break;
|
|
|
|
/*********************************************************************
|
|
**********************************************************************/
|
|
default:
|
|
proto_tree_add_item(eap_tree, hf_eap_data, tvb, offset, size, ENC_NA);
|
|
break;
|
|
/*********************************************************************
|
|
**********************************************************************/
|
|
} /* switch (eap_type) */
|
|
|
|
}
|
|
|
|
} /* switch (eap_code) */
|
|
|
|
return tvb_length(tvb);
|
|
}
|
|
|
|
void
|
|
proto_register_eap(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_eap_code, {
|
|
"Code", "eap.code",
|
|
FT_UINT8, BASE_DEC, VALS(eap_code_vals), 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_identifier, {
|
|
"Id", "eap.id",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_len, {
|
|
"Length", "eap.len",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_type, {
|
|
"Type", "eap.type",
|
|
FT_UINT8, BASE_DEC|BASE_EXT_STRING, &eap_type_vals_ext, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_type_nak, {
|
|
"Desired Auth Type", "eap.desired_type",
|
|
FT_UINT8, BASE_DEC|BASE_EXT_STRING, &eap_type_vals_ext, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_identity, {
|
|
"Identity", "eap.identity",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_notification, {
|
|
"Notification", "eap.notification",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_md5_value_size, {
|
|
"EAP-MD5 Value-Size", "eap.md5.value_size",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_md5_value, {
|
|
"EAP-MD5 Value", "eap.md5.value",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_md5_extra_data, {
|
|
"EAP-MD5 Extra Data", "eap.md5.extra_data",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_tls_flags, {
|
|
"EAP-TLS Flags", "eap.tls.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_tls_flag_l, {
|
|
"Length Included", "eap.tls.flags.len_included",
|
|
FT_BOOLEAN, 8, NULL, EAP_TLS_FLAG_L,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_tls_flag_m, {
|
|
"More Fragments", "eap.tls.flags.more_fragments",
|
|
FT_BOOLEAN, 8, NULL, EAP_TLS_FLAG_M,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_tls_flag_s, {
|
|
"Start", "eap.tls.flags.start",
|
|
FT_BOOLEAN, 8, NULL, EAP_TLS_FLAG_S,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_tls_flags_version, {
|
|
"Version", "eap.tls.flags.version",
|
|
FT_UINT8, BASE_DEC, NULL, EAP_TLS_FLAGS_VERSION,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_tls_len, {
|
|
"EAP-TLS Length", "eap.tls.len",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_tls_fragment, {
|
|
"EAP-TLS Fragment", "eap.tls.fragment",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_tls_fragments, {
|
|
"EAP-TLS Fragments", "eap.tls.fragments",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_tls_fragment_overlap, {
|
|
"Fragment Overlap", "eap.tls.fragment.overlap",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Fragment overlaps with other fragments", HFILL }},
|
|
|
|
{ &hf_eap_tls_fragment_overlap_conflict, {
|
|
"Conflicting Data In Fragment Overlap", "eap.tls.fragment.overlap_conflict",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Overlapping fragments contained conflicting data", HFILL }},
|
|
|
|
{ &hf_eap_tls_fragment_multiple_tails, {
|
|
"Multiple Tail Fragments Found", "eap.tls.fragment.multiple_tails",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Several tails were found when defragmenting the packet", HFILL }},
|
|
|
|
{ &hf_eap_tls_fragment_too_long_fragment,{
|
|
"Fragment Too Long", "eap.tls.fragment.fragment.too_long",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Fragment contained data past end of packet", HFILL }},
|
|
|
|
{ &hf_eap_tls_fragment_error, {
|
|
"Defragmentation Error", "eap.tls.fragment.error",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"Defragmentation error due to illegal fragments", HFILL }},
|
|
|
|
{ &hf_eap_tls_fragment_count, {
|
|
"Fragment Count", "eap.tls.fragment.count",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Total length of the reassembled payload", HFILL }},
|
|
|
|
{ &hf_eap_tls_reassembled_length, {
|
|
"Reassembled EAP-TLS Length", "eap.tls.reassembled.len",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Total length of the reassembled payload", HFILL }},
|
|
|
|
{ &hf_eap_sim_subtype, {
|
|
"EAP-SIM Subtype", "eap.sim.subtype",
|
|
FT_UINT8, BASE_DEC, VALS(eap_sim_subtype_vals), 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_sim_reserved, {
|
|
"EAP-SIM Reserved", "eap.sim.reserved",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_sim_subtype_attribute, {
|
|
"EAP-SIM Attribute", "eap.sim.subtype.attribute",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_sim_subtype_type, {
|
|
"EAP-SIM Type", "eap.sim.subtype.type",
|
|
FT_UINT8, BASE_DEC|BASE_EXT_STRING, &eap_sim_aka_attribute_vals_ext, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_sim_subtype_length, {
|
|
"EAP-SIM Length", "eap.sim.subtype.len",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_sim_subtype_value, {
|
|
"EAP-SIM Value", "eap.sim.subtype.value",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_aka_subtype, {
|
|
"EAP-AKA Subtype", "eap.aka.subtype",
|
|
FT_UINT8, BASE_DEC, VALS(eap_aka_subtype_vals), 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_aka_reserved, {
|
|
"EAP-AKA Reserved", "eap.aka.reserved",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_aka_subtype_attribute, {
|
|
"EAP-AKA Attribute", "eap.aka.subtype.attribute",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_aka_subtype_type, {
|
|
"EAP-AKA Type", "eap.aka.subtype.type",
|
|
FT_UINT8, BASE_DEC|BASE_EXT_STRING, &eap_sim_aka_attribute_vals_ext, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_aka_subtype_length, {
|
|
"EAP-AKA Length", "eap.aka.subtype.len",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_aka_subtype_value, {
|
|
"EAP-AKA Value", "eap.aka.subtype.value",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_leap_version, {
|
|
"EAP-LEAP Version", "eap.leap.version",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_leap_reserved, {
|
|
"EAP-LEAP Reserved", "eap.leap.reserved",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_leap_count, {
|
|
"EAP-LEAP Count", "eap.leap.count",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_leap_peer_challenge, {
|
|
"EAP-LEAP Peer-Challenge", "eap.leap.peer_challenge",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_leap_peer_response, {
|
|
"EAP-LEAP Peer-Response", "eap.leap.peer_response",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_leap_ap_challenge, {
|
|
"EAP-LEAP AP-Challenge", "eap.leap.ap_challenge",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_leap_ap_response, {
|
|
"EAP-LEAP AP-Response", "eap.leap.ap_response",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_leap_data, {
|
|
"EAP-LEAP Data", "eap.leap.data",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_leap_name, {
|
|
"EAP-LEAP Name", "eap.leap.name",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_opcode, {
|
|
"EAP-MS-CHAP-v2 OpCode", "eap.ms_chap_v2.opcode",
|
|
FT_UINT8, BASE_DEC, VALS(eap_ms_chap_v2_opcode_vals), 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_id, {
|
|
"EAP-MS-CHAP-v2 Id", "eap.ms_chap_v2.id",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_length, {
|
|
"EAP-MS-CHAP-v2 Length", "eap.ms_chap_v2.length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_value_size, {
|
|
"EAP-MS-CHAP-v2 Value-Size", "eap.ms_chap_v2.value_size",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_challenge, {
|
|
"EAP-MS-CHAP-v2 Challenge", "eap.ms_chap_v2.challenge",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_name, {
|
|
"EAP-MS-CHAP-v2 Name", "eap.ms_chap_v2.name",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_peer_challenge, {
|
|
"EAP-MS-CHAP-v2 Peer-Challenge", "eap.ms_chap_v2.peer_challenge",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_reserved, {
|
|
"EAP-MS-CHAP-v2 Reserved", "eap.ms_chap_v2.reserved",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_nt_response, {
|
|
"EAP-MS-CHAP-v2 NT-Response", "eap.ms_chap_v2.nt_response",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_flags, {
|
|
"EAP-MS-CHAP-v2 Flags", "eap.ms_chap_v2.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_response, {
|
|
"EAP-MS-CHAP-v2 Response (Unknown Length)", "eap.ms_chap_v2.response",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_message, {
|
|
"EAP-MS-CHAP-v2 Message", "eap.ms_chap_v2.message",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_failure_request, {
|
|
"EAP-MS-CHAP-v2 Failure-Request", "eap.ms_chap_v2.failure_request",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ms_chap_v2_data, {
|
|
"EAP-MS-CHAP-v2 Data", "eap.ms_chap_v2.data",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_data, {
|
|
"EAP Data", "eap.data",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
/* Expanded type fields */
|
|
{ &hf_eap_ext_vendor_id, {
|
|
"EAP-EXT Vendor Id", "eap.ext.vendor_id",
|
|
FT_UINT16, BASE_HEX, VALS(eap_ext_vendor_id_vals), 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_eap_ext_vendor_type, {
|
|
"EAP-EXT Vendor Type", "eap.ext.vendor_type",
|
|
FT_UINT8, BASE_HEX, VALS(eap_ext_vendor_type_vals), 0x0,
|
|
NULL, HFILL }}
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_eap,
|
|
&ett_eap_tls_fragment,
|
|
&ett_eap_tls_fragments,
|
|
&ett_eap_sim_attr,
|
|
&ett_eap_aka_attr,
|
|
&ett_eap_exp_attr,
|
|
&ett_eap_tls_flags
|
|
};
|
|
static ei_register_info ei[] = {
|
|
{ &ei_eap_ms_chap_v2_length, { "eap.ms_chap_v2.length.invalid", PI_PROTOCOL, PI_WARN, "Invalid Length", EXPFILL }},
|
|
{ &ei_eap_mitm_attacks, { "eap.mitm_attacks", PI_SECURITY, PI_WARN, "Vulnerable to MITM attacks. If possible, change EAP type.", EXPFILL }},
|
|
{ &ei_eap_md5_value_size_overflow, { "eap.md5.value_size.overflow", PI_PROTOCOL, PI_WARN, "Overflow", EXPFILL }},
|
|
{ &ei_eap_dictionary_attacks, { "eap.dictionary_attacks", PI_SECURITY, PI_WARN,
|
|
"Vulnerable to dictionary attacks. If possible, change EAP type."
|
|
" See http://www.cisco.com/warp/public/cc/pd/witc/ao350ap/prodlit/2331_pp.pdf", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_eap;
|
|
|
|
proto_eap = proto_register_protocol("Extensible Authentication Protocol",
|
|
"EAP", "eap");
|
|
proto_register_field_array(proto_eap, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_eap = expert_register_protocol(proto_eap);
|
|
expert_register_field_array(expert_eap, ei, array_length(ei));
|
|
|
|
eap_handle = new_register_dissector("eap", dissect_eap, proto_eap);
|
|
register_init_routine(eap_tls_defragment_init);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_eap(void)
|
|
{
|
|
/*
|
|
* Get a handle for the SSL/TLS dissector.
|
|
*/
|
|
ssl_handle = find_dissector("ssl");
|
|
|
|
dissector_add_uint("ppp.protocol", PPP_EAP, eap_handle);
|
|
}
|
|
/*
|
|
* Editor modelines
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|