2 * EAP peer method: EAP-TLV (draft-josefsson-pppext-eap-tls-eap-07.txt)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
23 * eap_tlv_build_nak - Build EAP-TLV NAK message
24 * @id: EAP identifier for the header
25 * @nak_type: TLV type (EAP_TLV_*)
26 * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
28 * This funtion builds an EAP-TLV NAK message. The caller is responsible for
29 * freeing the returned buffer.
31 struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
35 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
36 EAP_CODE_RESPONSE, id);
40 wpabuf_put_u8(msg, 0x80); /* Mandatory */
41 wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
42 wpabuf_put_be16(msg, 6); /* Length */
43 wpabuf_put_be32(msg, 0); /* Vendor-Id */
44 wpabuf_put_be16(msg, nak_type); /* NAK-Type */
51 * eap_tlv_build_result - Build EAP-TLV Result message
52 * @id: EAP identifier for the header
53 * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
54 * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
56 * This funtion builds an EAP-TLV Result message. The caller is responsible for
57 * freeing the returned buffer.
59 struct wpabuf * eap_tlv_build_result(int id, u16 status)
63 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 6,
64 EAP_CODE_RESPONSE, id);
68 wpabuf_put_u8(msg, 0x80); /* Mandatory */
69 wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
70 wpabuf_put_be16(msg, 2); /* Length */
71 wpabuf_put_be16(msg, status); /* Status */
78 * eap_tlv_process - Process a received EAP-TLV message and generate a response
79 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
80 * @ret: Return values from EAP request validation and processing
81 * @req: EAP-TLV request to be processed. The caller must have validated that
82 * the buffer is large enough to contain full request (hdr->length bytes) and
83 * that the EAP type is EAP_TYPE_TLV.
84 * @resp: Buffer to return a pointer to the allocated response message. This
85 * field should be initialized to %NULL before the call. The value will be
86 * updated if a response message is generated. The caller is responsible for
87 * freeing the allocated message.
88 * @force_failure: Force negotiation to fail
89 * Returns: 0 on success, -1 on failure
91 int eap_tlv_process(struct eap_sm *sm, struct eap_method_ret *ret,
92 const struct wpabuf *req, struct wpabuf **resp,
97 const u8 *result_tlv = NULL;
98 size_t result_tlv_len = 0;
99 int tlv_type, mandatory;
102 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
105 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
107 mandatory = !!(pos[0] & 0x80);
108 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
110 tlv_len = WPA_GET_BE16(pos);
113 if (tlv_len > left) {
114 wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
115 "(tlv_len=%lu left=%lu)",
116 (unsigned long) tlv_len,
117 (unsigned long) left);
121 case EAP_TLV_RESULT_TLV:
123 result_tlv_len = tlv_len;
126 wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
128 mandatory ? " (mandatory)" : "");
130 /* NAK TLV and ignore all TLVs in this packet.
132 *resp = eap_tlv_build_nak(eap_get_id(req),
134 return *resp == NULL ? -1 : 0;
136 /* Ignore this TLV, but process other TLVs */
144 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
145 "Request (left=%lu)", (unsigned long) left);
149 /* Process supported TLVs */
151 int status, resp_status;
152 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
153 result_tlv, result_tlv_len);
154 if (result_tlv_len < 2) {
155 wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
157 (unsigned long) result_tlv_len);
160 status = WPA_GET_BE16(result_tlv);
161 if (status == EAP_TLV_RESULT_SUCCESS) {
162 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
163 "- EAP-TLV/Phase2 Completed");
165 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
166 " - force failed Phase 2");
167 resp_status = EAP_TLV_RESULT_FAILURE;
168 ret->decision = DECISION_FAIL;
170 resp_status = EAP_TLV_RESULT_SUCCESS;
171 ret->decision = DECISION_UNCOND_SUCC;
173 } else if (status == EAP_TLV_RESULT_FAILURE) {
174 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
175 resp_status = EAP_TLV_RESULT_FAILURE;
176 ret->decision = DECISION_FAIL;
178 wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
179 "Status %d", status);
180 resp_status = EAP_TLV_RESULT_FAILURE;
181 ret->decision = DECISION_FAIL;
183 ret->methodState = METHOD_DONE;
185 *resp = eap_tlv_build_result(eap_get_id(req), resp_status);