2 * Copyright (c) 2004 - Michael Richardson <mcr@xelerance.com>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that: (1) source code distributions
6 * retain the above copyright notice and this paragraph in its entirety, (2)
7 * distributions including binary code include the above copyright notice and
8 * this paragraph in its entirety in the documentation or other materials
9 * provided with the distribution, and (3) all advertising materials mentioning
10 * features or use of this software display the following acknowledgement:
11 * ``This product includes software developed by the University of California,
12 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
13 * the University nor the names of its contributors may be used to endorse
14 * or promote products derived from this software without specific prior
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 /* \summary: Extensible Authentication Protocol (EAP) printer */
27 #include "netdissect-stdinc.h"
29 #include "netdissect.h"
32 #define EAP_FRAME_TYPE_PACKET 0
33 #define EAP_FRAME_TYPE_START 1
34 #define EAP_FRAME_TYPE_LOGOFF 2
35 #define EAP_FRAME_TYPE_KEY 3
36 #define EAP_FRAME_TYPE_ENCAP_ASF_ALERT 4
44 static const struct tok eap_frame_type_values[] = {
45 { EAP_FRAME_TYPE_PACKET, "EAP packet" },
46 { EAP_FRAME_TYPE_START, "EAPOL start" },
47 { EAP_FRAME_TYPE_LOGOFF, "EAPOL logoff" },
48 { EAP_FRAME_TYPE_KEY, "EAPOL key" },
49 { EAP_FRAME_TYPE_ENCAP_ASF_ALERT, "Encapsulated ASF alert" },
61 #define EAP_RESPONSE 2
65 static const struct tok eap_code_values[] = {
66 { EAP_REQUEST, "Request" },
67 { EAP_RESPONSE, "Response" },
68 { EAP_SUCCESS, "Success" },
69 { EAP_FAILURE, "Failure" },
73 #define EAP_TYPE_NO_PROPOSED 0
74 #define EAP_TYPE_IDENTITY 1
75 #define EAP_TYPE_NOTIFICATION 2
76 #define EAP_TYPE_NAK 3
77 #define EAP_TYPE_MD5_CHALLENGE 4
78 #define EAP_TYPE_OTP 5
79 #define EAP_TYPE_GTC 6
80 #define EAP_TYPE_TLS 13 /* RFC 2716 */
81 #define EAP_TYPE_SIM 18 /* RFC 4186 */
82 #define EAP_TYPE_TTLS 21 /* draft-funk-eap-ttls-v0-01.txt */
83 #define EAP_TYPE_AKA 23 /* RFC 4187 */
84 #define EAP_TYPE_FAST 43 /* RFC 4851 */
85 #define EAP_TYPE_EXPANDED_TYPES 254
86 #define EAP_TYPE_EXPERIMENTAL 255
88 static const struct tok eap_type_values[] = {
89 { EAP_TYPE_NO_PROPOSED, "No proposed" },
90 { EAP_TYPE_IDENTITY, "Identity" },
91 { EAP_TYPE_NOTIFICATION, "Notification" },
92 { EAP_TYPE_NAK, "Nak" },
93 { EAP_TYPE_MD5_CHALLENGE, "MD5-challenge" },
94 { EAP_TYPE_OTP, "OTP" },
95 { EAP_TYPE_GTC, "GTC" },
96 { EAP_TYPE_TLS, "TLS" },
97 { EAP_TYPE_SIM, "SIM" },
98 { EAP_TYPE_TTLS, "TTLS" },
99 { EAP_TYPE_AKA, "AKA" },
100 { EAP_TYPE_FAST, "FAST" },
101 { EAP_TYPE_EXPANDED_TYPES, "Expanded types" },
102 { EAP_TYPE_EXPERIMENTAL, "Experimental" },
106 #define EAP_TLS_EXTRACT_BIT_L(x) (((x)&0x80)>>7)
108 /* RFC 2716 - EAP TLS bits */
109 #define EAP_TLS_FLAGS_LEN_INCLUDED (1 << 7)
110 #define EAP_TLS_FLAGS_MORE_FRAGMENTS (1 << 6)
111 #define EAP_TLS_FLAGS_START (1 << 5)
113 static const struct tok eap_tls_flags_values[] = {
114 { EAP_TLS_FLAGS_LEN_INCLUDED, "L bit" },
115 { EAP_TLS_FLAGS_MORE_FRAGMENTS, "More fragments bit"},
116 { EAP_TLS_FLAGS_START, "Start bit"},
120 #define EAP_TTLS_VERSION(x) ((x)&0x07)
122 /* EAP-AKA and EAP-SIM - RFC 4187 */
123 #define EAP_AKA_CHALLENGE 1
124 #define EAP_AKA_AUTH_REJECT 2
125 #define EAP_AKA_SYNC_FAILURE 4
126 #define EAP_AKA_IDENTITY 5
127 #define EAP_SIM_START 10
128 #define EAP_SIM_CHALLENGE 11
129 #define EAP_AKA_NOTIFICATION 12
130 #define EAP_AKA_REAUTH 13
131 #define EAP_AKA_CLIENT_ERROR 14
133 static const struct tok eap_aka_subtype_values[] = {
134 { EAP_AKA_CHALLENGE, "Challenge" },
135 { EAP_AKA_AUTH_REJECT, "Auth reject" },
136 { EAP_AKA_SYNC_FAILURE, "Sync failure" },
137 { EAP_AKA_IDENTITY, "Identity" },
138 { EAP_SIM_START, "Start" },
139 { EAP_SIM_CHALLENGE, "Challenge" },
140 { EAP_AKA_NOTIFICATION, "Notification" },
141 { EAP_AKA_REAUTH, "Reauth" },
142 { EAP_AKA_CLIENT_ERROR, "Client error" },
147 * Print EAP requests / responses
150 eap_print(netdissect_options *ndo,
154 u_int type, subtype, len;
158 len = GET_BE_U_2(cp + 2);
162 ND_PRINT("%s (%u), id %u, len %u",
163 tok2str(eap_code_values, "unknown", type),
168 ND_TCHECK_LEN(cp, len);
170 if (type == EAP_REQUEST || type == EAP_RESPONSE) {
171 /* RFC 3748 Section 4.1 */
172 subtype = GET_U_1(cp + 4);
173 ND_PRINT("\n\t\t Type %s (%u)",
174 tok2str(eap_type_values, "unknown", subtype),
178 case EAP_TYPE_IDENTITY:
180 ND_PRINT(", Identity: ");
181 nd_printjnp(ndo, cp + 5, len - 5);
185 case EAP_TYPE_NOTIFICATION:
187 ND_PRINT(", Notification: ");
188 nd_printjnp(ndo, cp + 5, len - 5);
196 * one or more octets indicating
197 * the desired authentication
198 * type one octet per type
200 while (count < (int)len) {
201 ND_PRINT(" %s (%u),",
202 tok2str(eap_type_values, "unknown", GET_U_1((cp + count))),
203 GET_U_1(cp + count));
210 if (subtype == EAP_TYPE_TTLS)
212 EAP_TTLS_VERSION(GET_U_1((cp + 5))));
213 ND_PRINT(" flags [%s] 0x%02x,",
214 bittok2str(eap_tls_flags_values, "none", GET_U_1((cp + 5))),
217 if (EAP_TLS_EXTRACT_BIT_L(GET_U_1(cp + 5))) {
218 ND_PRINT(" len %u", GET_BE_U_4(cp + 6));
224 EAP_TTLS_VERSION(GET_U_1((cp + 5))));
225 ND_PRINT(" flags [%s] 0x%02x,",
226 bittok2str(eap_tls_flags_values, "none", GET_U_1((cp + 5))),
229 if (EAP_TLS_EXTRACT_BIT_L(GET_U_1(cp + 5))) {
230 ND_PRINT(" len %u", GET_BE_U_4(cp + 6));
233 /* FIXME - TLV attributes follow */
238 ND_PRINT(" subtype [%s] 0x%02x,",
239 tok2str(eap_aka_subtype_values, "unknown", GET_U_1((cp + 5))),
242 /* FIXME - TLV attributes follow */
245 case EAP_TYPE_MD5_CHALLENGE:
248 case EAP_TYPE_EXPANDED_TYPES:
249 case EAP_TYPE_EXPERIMENTAL:
260 eapol_print(netdissect_options *ndo,
263 const struct eap_frame_t *eap;
264 u_int eap_type, eap_len;
266 ndo->ndo_protocol = "eap";
267 eap = (const struct eap_frame_t *)cp;
269 eap_type = GET_U_1(eap->type);
271 ND_PRINT("%s (%u) v%u, len %u",
272 tok2str(eap_frame_type_values, "unknown", eap_type),
274 GET_U_1(eap->version),
275 GET_BE_U_2(eap->length));
276 if (ndo->ndo_vflag < 1)
279 cp += sizeof(struct eap_frame_t);
280 eap_len = GET_BE_U_2(eap->length);
283 case EAP_FRAME_TYPE_PACKET:
287 eap_print(ndo, cp, eap_len);
289 case EAP_FRAME_TYPE_LOGOFF:
290 case EAP_FRAME_TYPE_ENCAP_ASF_ALERT: