static void eap_pax_process_std_2(struct eap_sm *sm, struct eap_pax_data *data, struct wpabuf *respData) { struct eap_pax_hdr *resp; u8 mac[EAP_PAX_MAC_LEN], icvbuf[EAP_PAX_ICV_LEN]; const u8 *pos; size_t len, left; int i; if (data->state != PAX_STD_1) return; wpa_printf(MSG_DEBUG, "EAP-PAX: Received PAX_STD-2"); pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len); if (pos == NULL || len < sizeof(*resp) + EAP_PAX_ICV_LEN) return; resp = (struct eap_pax_hdr *) pos; pos = (u8 *) (resp + 1); left = len - sizeof(*resp); if (left < 2 + EAP_PAX_RAND_LEN || WPA_GET_BE16(pos) != EAP_PAX_RAND_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (B)"); return; } pos += 2; left -= 2; os_memcpy(data->rand.r.y, pos, EAP_PAX_RAND_LEN); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Y (client rand)", data->rand.r.y, EAP_PAX_RAND_LEN); pos += EAP_PAX_RAND_LEN; left -= EAP_PAX_RAND_LEN; if (left < 2 || (size_t) 2 + WPA_GET_BE16(pos) > left) { wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (CID)"); return; } data->cid_len = WPA_GET_BE16(pos); os_free(data->cid); data->cid = os_malloc(data->cid_len); if (data->cid == NULL) { wpa_printf(MSG_INFO, "EAP-PAX: Failed to allocate memory for " "CID"); return; } os_memcpy(data->cid, pos + 2, data->cid_len); pos += 2 + data->cid_len; left -= 2 + data->cid_len; wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-PAX: CID", (u8 *) data->cid, data->cid_len); if (left < 2 + EAP_PAX_MAC_LEN || WPA_GET_BE16(pos) != EAP_PAX_MAC_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (MAC_CK)"); return; } pos += 2; left -= 2; wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(A, B, CID)", pos, EAP_PAX_MAC_LEN); if (eap_user_get(sm, (u8 *) data->cid, data->cid_len, 0) < 0) { wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: unknown CID", (u8 *) data->cid, data->cid_len); data->state = FAILURE; return; } for (i = 0; i < EAP_MAX_METHODS && (sm->user->methods[i].vendor != EAP_VENDOR_IETF || sm->user->methods[i].method != EAP_TYPE_NONE); i++) { if (sm->user->methods[i].vendor == EAP_VENDOR_IETF && sm->user->methods[i].method == EAP_TYPE_PAX) break; } if (i >= EAP_MAX_METHODS || sm->user->methods[i].vendor != EAP_VENDOR_IETF || sm->user->methods[i].method != EAP_TYPE_PAX) { wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: EAP-PAX not enabled for CID", (u8 *) data->cid, data->cid_len); data->state = FAILURE; return; } if (sm->user->password == NULL || sm->user->password_len != EAP_PAX_AK_LEN) { wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: invalid password in " "user database for CID", (u8 *) data->cid, data->cid_len); data->state = FAILURE; return; } os_memcpy(data->ak, sm->user->password, EAP_PAX_AK_LEN); if (eap_pax_initial_key_derivation(data->mac_id, data->ak, data->rand.e, data->mk, data->ck, data->ick) < 0) { wpa_printf(MSG_INFO, "EAP-PAX: Failed to complete initial " "key derivation"); data->state = FAILURE; return; } data->keys_set = 1; eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN, data->rand.r.x, EAP_PAX_RAND_LEN, data->rand.r.y, EAP_PAX_RAND_LEN, (u8 *) data->cid, data->cid_len, mac); if (os_memcmp_const(mac, pos, EAP_PAX_MAC_LEN) != 0) { wpa_printf(MSG_INFO, "EAP-PAX: Invalid MAC_CK(A, B, CID) in " "PAX_STD-2"); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected MAC_CK(A, B, CID)", mac, EAP_PAX_MAC_LEN); data->state = FAILURE; return; } pos += EAP_PAX_MAC_LEN; left -= EAP_PAX_MAC_LEN; if (left < EAP_PAX_ICV_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: Too short ICV (%lu) in " "PAX_STD-2", (unsigned long) left); return; } wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN); eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, wpabuf_head(respData), wpabuf_len(respData) - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, icvbuf); if (os_memcmp_const(icvbuf, pos, EAP_PAX_ICV_LEN) != 0) { wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV in PAX_STD-2"); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV", icvbuf, EAP_PAX_ICV_LEN); return; } pos += EAP_PAX_ICV_LEN; left -= EAP_PAX_ICV_LEN; if (left > 0) { wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload", pos, left); } data->state = PAX_STD_3; }
static struct wpabuf * eap_pax_process_std_1(struct eap_pax_data *data, struct eap_method_ret *ret, u8 id, const struct eap_pax_hdr *req, size_t req_plen) { struct wpabuf *resp; const u8 *pos; u8 *rpos; size_t left, plen; wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-1 (received)"); if (data->state != PAX_INIT) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 received in " "unexpected state (%d) - ignored", data->state); ret->ignore = TRUE; return NULL; } if (req->flags & EAP_PAX_FLAGS_CE) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with CE flag set - " "ignored"); ret->ignore = TRUE; return NULL; } left = req_plen - sizeof(*req); if (left < 2 + EAP_PAX_RAND_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with too short " "payload"); ret->ignore = TRUE; return NULL; } pos = (const u8 *) (req + 1); if (WPA_GET_BE16(pos) != EAP_PAX_RAND_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with incorrect A " "length %d (expected %d)", WPA_GET_BE16(pos), EAP_PAX_RAND_LEN); ret->ignore = TRUE; return NULL; } pos += 2; left -= 2; os_memcpy(data->rand.r.x, pos, EAP_PAX_RAND_LEN); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: X (server rand)", data->rand.r.x, EAP_PAX_RAND_LEN); pos += EAP_PAX_RAND_LEN; left -= EAP_PAX_RAND_LEN; if (left > 0) { wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload", pos, left); } if (random_get_bytes(data->rand.r.y, EAP_PAX_RAND_LEN)) { wpa_printf(MSG_ERROR, "EAP-PAX: Failed to get random data"); ret->ignore = TRUE; return NULL; } wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Y (client rand)", data->rand.r.y, EAP_PAX_RAND_LEN); if (eap_pax_initial_key_derivation(req->mac_id, data->ak, data->rand.e, data->mk, data->ck, data->ick, data->mid) < 0) { ret->ignore = TRUE; return NULL; } wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-2 (sending)"); plen = 2 + EAP_PAX_RAND_LEN + 2 + data->cid_len + 2 + EAP_PAX_MAC_LEN + EAP_PAX_ICV_LEN; resp = eap_pax_alloc_resp(req, id, EAP_PAX_OP_STD_2, plen); if (resp == NULL) return NULL; wpabuf_put_be16(resp, EAP_PAX_RAND_LEN); wpabuf_put_data(resp, data->rand.r.y, EAP_PAX_RAND_LEN); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: B = Y (client rand)", data->rand.r.y, EAP_PAX_RAND_LEN); wpabuf_put_be16(resp, data->cid_len); wpabuf_put_data(resp, data->cid, data->cid_len); wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-PAX: CID", (u8 *) data->cid, data->cid_len); wpabuf_put_be16(resp, EAP_PAX_MAC_LEN); rpos = wpabuf_put(resp, EAP_PAX_MAC_LEN); eap_pax_mac(req->mac_id, data->ck, EAP_PAX_CK_LEN, data->rand.r.x, EAP_PAX_RAND_LEN, data->rand.r.y, EAP_PAX_RAND_LEN, (u8 *) data->cid, data->cid_len, rpos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(A, B, CID)", rpos, EAP_PAX_MAC_LEN); /* Optional ADE could be added here, if needed */ rpos = wpabuf_put(resp, EAP_PAX_ICV_LEN); eap_pax_mac(req->mac_id, data->ick, EAP_PAX_ICK_LEN, wpabuf_head(resp), wpabuf_len(resp) - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, rpos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", rpos, EAP_PAX_ICV_LEN); data->state = PAX_STD_2_SENT; data->mac_id = req->mac_id; data->dh_group_id = req->dh_group_id; data->public_key_id = req->public_key_id; return resp; }