/*
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* EAP-IKEv2 common routines
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* Copyright (c) 2007, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "eap_defs.h"
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#include "eap_common.h"
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#include "ikev2_common.h"
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#include "eap_ikev2_common.h"
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int eap_ikev2_derive_keymat(int prf, struct ikev2_keys *keys,
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const u8 *i_nonce, size_t i_nonce_len,
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const u8 *r_nonce, size_t r_nonce_len,
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u8 *keymat)
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{
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u8 *nonces;
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size_t nlen;
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/* KEYMAT = prf+(SK_d, Ni | Nr) */
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if (keys->SK_d == NULL || i_nonce == NULL || r_nonce == NULL)
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return -1;
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nlen = i_nonce_len + r_nonce_len;
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nonces = os_malloc(nlen);
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if (nonces == NULL)
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return -1;
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os_memcpy(nonces, i_nonce, i_nonce_len);
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os_memcpy(nonces + i_nonce_len, r_nonce, r_nonce_len);
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if (ikev2_prf_plus(prf, keys->SK_d, keys->SK_d_len, nonces, nlen,
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keymat, EAP_MSK_LEN + EAP_EMSK_LEN)) {
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os_free(nonces);
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return -1;
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}
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os_free(nonces);
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wpa_hexdump_key(MSG_DEBUG, "EAP-IKEV2: KEYMAT",
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keymat, EAP_MSK_LEN + EAP_EMSK_LEN);
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return 0;
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}
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struct wpabuf * eap_ikev2_build_frag_ack(u8 id, u8 code)
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{
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struct wpabuf *msg;
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msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IKEV2, 0, code, id);
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if (msg == NULL) {
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wpa_printf(MSG_ERROR, "EAP-IKEV2: Failed to allocate memory "
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"for fragment ack");
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return NULL;
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}
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wpa_printf(MSG_DEBUG, "EAP-IKEV2: Send fragment ack");
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return msg;
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}
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int eap_ikev2_validate_icv(int integ_alg, struct ikev2_keys *keys,
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int initiator, const struct wpabuf *msg,
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const u8 *pos, const u8 *end)
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{
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const struct ikev2_integ_alg *integ;
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size_t icv_len;
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u8 icv[IKEV2_MAX_HASH_LEN];
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const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
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integ = ikev2_get_integ(integ_alg);
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if (integ == NULL) {
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wpa_printf(MSG_DEBUG, "EAP-IKEV2: Unknown INTEG "
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"transform / cannot validate ICV");
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return -1;
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}
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icv_len = integ->hash_len;
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if (end - pos < (int) icv_len) {
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wpa_printf(MSG_DEBUG, "EAP-IKEV2: Not enough room in the "
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"message for Integrity Checksum Data");
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return -1;
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}
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if (SK_a == NULL) {
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wpa_printf(MSG_DEBUG, "EAP-IKEV2: No SK_a for ICV validation");
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return -1;
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}
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if (ikev2_integ_hash(integ_alg, SK_a, keys->SK_integ_len,
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wpabuf_head(msg),
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wpabuf_len(msg) - icv_len, icv) < 0) {
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wpa_printf(MSG_INFO, "EAP-IKEV2: Could not calculate ICV");
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return -1;
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}
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if (os_memcmp_const(icv, end - icv_len, icv_len) != 0) {
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wpa_printf(MSG_INFO, "EAP-IKEV2: Invalid ICV");
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wpa_hexdump(MSG_DEBUG, "EAP-IKEV2: Calculated ICV",
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icv, icv_len);
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wpa_hexdump(MSG_DEBUG, "EAP-IKEV2: Received ICV",
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end - icv_len, icv_len);
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return -1;
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}
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wpa_printf(MSG_DEBUG, "EAP-IKEV2: Valid Integrity Checksum Data in "
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"the received message");
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return icv_len;
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}
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