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https://github.com/the-tcpdump-group/tcpdump.git
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4b0d808e20
Enable ND_LONGJMP_FROM_TCHECK and remove the 'trunc' labels. Report invalid packets as invalid. Use ND_ICHECK_U() for length check. Remove a redundant ND_TCHECK_SIZE(). Add a const qualifier for the eap_print() parameter 'length'. Update a test output accordingly.
317 lines
9.6 KiB
C
317 lines
9.6 KiB
C
/*
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* Copyright (c) 2004 - Michael Richardson <mcr@xelerance.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: Extensible Authentication Protocol (EAP) printer */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "netdissect-stdinc.h"
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#define ND_LONGJMP_FROM_TCHECK
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#include "netdissect.h"
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#include "extract.h"
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#define EAP_FRAME_TYPE_PACKET 0
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#define EAP_FRAME_TYPE_START 1
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#define EAP_FRAME_TYPE_LOGOFF 2
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#define EAP_FRAME_TYPE_KEY 3
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#define EAP_FRAME_TYPE_ENCAP_ASF_ALERT 4
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struct eap_frame_t {
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nd_uint8_t version;
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nd_uint8_t type;
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nd_uint16_t length;
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};
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static const struct tok eap_frame_type_values[] = {
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{ EAP_FRAME_TYPE_PACKET, "EAP packet" },
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{ EAP_FRAME_TYPE_START, "EAPOL start" },
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{ EAP_FRAME_TYPE_LOGOFF, "EAPOL logoff" },
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{ EAP_FRAME_TYPE_KEY, "EAPOL key" },
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{ EAP_FRAME_TYPE_ENCAP_ASF_ALERT, "Encapsulated ASF alert" },
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{ 0, NULL}
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};
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/* RFC 3748 */
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struct eap_packet_t {
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nd_uint8_t code;
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nd_uint8_t id;
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nd_uint16_t length;
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};
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#define EAP_REQUEST 1
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#define EAP_RESPONSE 2
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#define EAP_SUCCESS 3
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#define EAP_FAILURE 4
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static const struct tok eap_code_values[] = {
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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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{ 0, NULL}
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};
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#define EAP_TYPE_NO_PROPOSED 0
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#define EAP_TYPE_IDENTITY 1
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#define EAP_TYPE_NOTIFICATION 2
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#define EAP_TYPE_NAK 3
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#define EAP_TYPE_MD5_CHALLENGE 4
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#define EAP_TYPE_OTP 5
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#define EAP_TYPE_GTC 6
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#define EAP_TYPE_TLS 13 /* RFC 5216 */
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#define EAP_TYPE_SIM 18 /* RFC 4186 */
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#define EAP_TYPE_TTLS 21 /* RFC 5281, draft-funk-eap-ttls-v0-01.txt */
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#define EAP_TYPE_AKA 23 /* RFC 4187 */
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#define EAP_TYPE_FAST 43 /* RFC 4851 */
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#define EAP_TYPE_EXPANDED_TYPES 254
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#define EAP_TYPE_EXPERIMENTAL 255
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static const struct tok eap_type_values[] = {
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{ EAP_TYPE_NO_PROPOSED, "No proposed" },
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{ EAP_TYPE_IDENTITY, "Identity" },
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{ EAP_TYPE_NOTIFICATION, "Notification" },
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{ EAP_TYPE_NAK, "Nak" },
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{ EAP_TYPE_MD5_CHALLENGE, "MD5-challenge" },
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{ EAP_TYPE_OTP, "OTP" },
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{ EAP_TYPE_GTC, "GTC" },
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{ EAP_TYPE_TLS, "TLS" },
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{ EAP_TYPE_SIM, "SIM" },
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{ EAP_TYPE_TTLS, "TTLS" },
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{ EAP_TYPE_AKA, "AKA" },
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{ EAP_TYPE_FAST, "FAST" },
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{ EAP_TYPE_EXPANDED_TYPES, "Expanded types" },
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{ EAP_TYPE_EXPERIMENTAL, "Experimental" },
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{ 0, NULL}
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};
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#define EAP_TLS_EXTRACT_BIT_L(x) (((x)&0x80)>>7)
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/* RFC 5216 - EAP TLS bits */
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#define EAP_TLS_FLAGS_LEN_INCLUDED (1 << 7)
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#define EAP_TLS_FLAGS_MORE_FRAGMENTS (1 << 6)
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#define EAP_TLS_FLAGS_START (1 << 5)
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static const struct tok eap_tls_flags_values[] = {
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{ EAP_TLS_FLAGS_LEN_INCLUDED, "L bit" },
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{ EAP_TLS_FLAGS_MORE_FRAGMENTS, "More fragments bit"},
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{ EAP_TLS_FLAGS_START, "Start bit"},
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{ 0, NULL}
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};
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#define EAP_TTLS_VERSION(x) ((x)&0x07)
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/* EAP-AKA and EAP-SIM - RFC 4187 */
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#define EAP_AKA_CHALLENGE 1
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#define EAP_AKA_AUTH_REJECT 2
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#define EAP_AKA_SYNC_FAILURE 4
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#define EAP_AKA_IDENTITY 5
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#define EAP_SIM_START 10
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#define EAP_SIM_CHALLENGE 11
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#define EAP_AKA_NOTIFICATION 12
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#define EAP_AKA_REAUTH 13
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#define EAP_AKA_CLIENT_ERROR 14
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static const struct tok eap_aka_subtype_values[] = {
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{ EAP_AKA_CHALLENGE, "Challenge" },
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{ EAP_AKA_AUTH_REJECT, "Auth reject" },
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{ EAP_AKA_SYNC_FAILURE, "Sync failure" },
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{ EAP_AKA_IDENTITY, "Identity" },
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{ EAP_SIM_START, "Start" },
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{ EAP_SIM_CHALLENGE, "Challenge" },
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{ EAP_AKA_NOTIFICATION, "Notification" },
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{ EAP_AKA_REAUTH, "Reauth" },
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{ EAP_AKA_CLIENT_ERROR, "Client error" },
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{ 0, NULL}
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};
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/*
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* Print EAP requests / responses
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*/
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void
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eap_print(netdissect_options *ndo,
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const u_char *cp,
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const u_int length)
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{
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u_int type, subtype, len;
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u_int count;
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const char *sep;
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ndo->ndo_protocol = "eap";
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type = GET_U_1(cp);
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len = GET_BE_U_2(cp + 2);
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ND_ICHECK_U(len, <, 4);
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if (len != length) {
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/*
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* Probably a fragment; in some cases the fragmentation might
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* not put an EAP header on every packet, if reassembly can
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* be done without that (e.g., fragmentation to make a message
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* fit in multiple TLVs in a RADIUS packet).
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*/
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ND_PRINT("EAP fragment?");
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return;
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}
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ND_PRINT("%s (%u), id %u, len %u",
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tok2str(eap_code_values, "unknown", type),
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type,
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GET_U_1((cp + 1)),
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len);
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ND_TCHECK_LEN(cp, len);
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if (type == EAP_REQUEST || type == EAP_RESPONSE) {
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/* RFC 3748 Section 4.1 */
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ND_ICHECK_U(len, <, 5);
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subtype = GET_U_1(cp + 4);
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ND_PRINT("\n\t\t Type %s (%u)",
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tok2str(eap_type_values, "unknown", subtype),
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subtype);
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switch (subtype) {
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case EAP_TYPE_IDENTITY:
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/* According to RFC 3748, the message is optional */
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if (len > 5) {
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ND_PRINT(", Identity: ");
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nd_printjnp(ndo, cp + 5, len - 5);
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}
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break;
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case EAP_TYPE_NOTIFICATION:
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/* According to RFC 3748, there must be at least one octet of message */
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ND_ICHECK_U(len, <, 6);
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ND_PRINT(", Notification: ");
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nd_printjnp(ndo, cp + 5, len - 5);
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break;
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case EAP_TYPE_NAK:
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/*
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* one or more octets indicating
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* the desired authentication
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* type one octet per type
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*/
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ND_ICHECK_U(len, <, 6);
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sep = "";
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for (count = 5; count < len; count++) {
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ND_PRINT("%s %s (%u)", sep,
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tok2str(eap_type_values, "unknown", GET_U_1((cp + count))),
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GET_U_1(cp + count));
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sep = ",";
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}
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break;
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case EAP_TYPE_TTLS:
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case EAP_TYPE_TLS:
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ND_ICHECK_U(len, <, 6);
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if (subtype == EAP_TYPE_TTLS)
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ND_PRINT(" TTLSv%u",
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EAP_TTLS_VERSION(GET_U_1((cp + 5))));
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ND_PRINT(" flags [%s] 0x%02x",
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bittok2str(eap_tls_flags_values, "none", GET_U_1((cp + 5))),
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GET_U_1(cp + 5));
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if (EAP_TLS_EXTRACT_BIT_L(GET_U_1(cp + 5))) {
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ND_ICHECK_U(len, <, 10);
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ND_PRINT(", len %u", GET_BE_U_4(cp + 6));
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}
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break;
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case EAP_TYPE_FAST:
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ND_ICHECK_U(len, <, 6);
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ND_PRINT(" FASTv%u",
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EAP_TTLS_VERSION(GET_U_1((cp + 5))));
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ND_PRINT(" flags [%s] 0x%02x",
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bittok2str(eap_tls_flags_values, "none", GET_U_1((cp + 5))),
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GET_U_1(cp + 5));
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if (EAP_TLS_EXTRACT_BIT_L(GET_U_1(cp + 5))) {
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ND_ICHECK_U(len, <, 10);
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ND_PRINT(", len %u", GET_BE_U_4(cp + 6));
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}
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/* FIXME - TLV attributes follow */
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break;
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case EAP_TYPE_AKA:
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case EAP_TYPE_SIM:
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ND_ICHECK_U(len, <, 6);
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ND_PRINT(" subtype [%s] 0x%02x",
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tok2str(eap_aka_subtype_values, "unknown", GET_U_1((cp + 5))),
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GET_U_1(cp + 5));
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/* FIXME - TLV attributes follow */
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break;
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case EAP_TYPE_MD5_CHALLENGE:
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case EAP_TYPE_OTP:
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case EAP_TYPE_GTC:
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case EAP_TYPE_EXPANDED_TYPES:
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case EAP_TYPE_EXPERIMENTAL:
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default:
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break;
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}
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}
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return;
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invalid:
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nd_print_invalid(ndo);
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}
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void
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eapol_print(netdissect_options *ndo,
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const u_char *cp)
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{
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const struct eap_frame_t *eap;
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u_int eap_type, eap_len;
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ndo->ndo_protocol = "eap";
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eap = (const struct eap_frame_t *)cp;
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eap_type = GET_U_1(eap->type);
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ND_PRINT("%s (%u) v%u, len %u",
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tok2str(eap_frame_type_values, "unknown", eap_type),
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eap_type,
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GET_U_1(eap->version),
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GET_BE_U_2(eap->length));
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if (ndo->ndo_vflag < 1)
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return;
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cp += sizeof(struct eap_frame_t);
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eap_len = GET_BE_U_2(eap->length);
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switch (eap_type) {
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case EAP_FRAME_TYPE_PACKET:
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if (eap_len == 0)
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goto invalid;
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ND_PRINT(", ");
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eap_print(ndo, cp, eap_len);
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break;
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case EAP_FRAME_TYPE_LOGOFF:
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case EAP_FRAME_TYPE_ENCAP_ASF_ALERT:
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default:
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break;
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}
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return;
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invalid:
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nd_print_invalid(ndo);
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}
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