dist/wpa/src/eap_peer/eap_otp.c

   1 /*
   2  * EAP peer method: EAP-OTP (RFC 3748)
   3  * Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
   4  *
   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.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "eap_i.h"
  19
  20
  21 static void * eap_otp_init(struct eap_sm *sm)
  22 {
  23         /* No need for private data. However, must return non-NULL to indicate
  24          * success. */
  25         return (void *) 1;
  26 }
  27
  28
  29 static void eap_otp_deinit(struct eap_sm *sm, void *priv)
  30 {
  31 }
  32
  33
  34 static struct wpabuf * eap_otp_process(struct eap_sm *sm, void *priv,
  35                                        struct eap_method_ret *ret,
  36                                        const struct wpabuf *reqData)
  37 {
  38         struct wpabuf *resp;
  39         const u8 *pos, *password;
  40         size_t password_len, len;
  41         int otp;
  42
  43         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_OTP, reqData, &len);
  44         if (pos == NULL) {
  45                 ret->ignore = TRUE;
  46                 return NULL;
  47         }
  48         wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-OTP: Request message",
  49                           pos, len);
  50
  51         password = eap_get_config_otp(sm, &password_len);
  52         if (password)
  53                 otp = 1;
  54         else {
  55                 password = eap_get_config_password(sm, &password_len);
  56                 otp = 0;
  57         }
  58
  59         if (password == NULL) {
  60                 wpa_printf(MSG_INFO, "EAP-OTP: Password not configured");
  61                 eap_sm_request_otp(sm, (const char *) pos, len);
  62                 ret->ignore = TRUE;
  63                 return NULL;
  64         }
  65
  66         ret->ignore = FALSE;
  67
  68         ret->methodState = METHOD_DONE;
  69         ret->decision = DECISION_COND_SUCC;
  70         ret->allowNotifications = FALSE;
  71
  72         resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_OTP, password_len,
  73                              EAP_CODE_RESPONSE, eap_get_id(reqData));
  74         if (resp == NULL)
  75                 return NULL;
  76         wpabuf_put_data(resp, password, password_len);
  77         wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-OTP: Response",
  78                               password, password_len);
  79
  80         if (otp) {
  81                 wpa_printf(MSG_DEBUG, "EAP-OTP: Forgetting used password");
  82                 eap_clear_config_otp(sm);
  83         }
  84
  85         return resp;
  86 }
  87
  88
  89 int eap_peer_otp_register(void)
  90 {
  91         struct eap_method *eap;
  92         int ret;
  93
  94         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
  95                                     EAP_VENDOR_IETF, EAP_TYPE_OTP, "OTP");
  96         if (eap == NULL)
  97                 return -1;
  98
  99         eap->init = eap_otp_init;
 100         eap->deinit = eap_otp_deinit;
 101         eap->process = eap_otp_process;
 102
 103         ret = eap_peer_method_register(eap);
 104         if (ret)
 105                 eap_peer_method_free(eap);
 106         return ret;
 107 }