contrib/wpa_supplicant-0.4.9/eap_gtc.c

   1 /*
   2  * WPA Supplicant / EAP-GTC (RFC 2284)
   3  * Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.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 <stdlib.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18
  19 #include "common.h"
  20 #include "eap_i.h"
  21 #include "wpa_supplicant.h"
  22 #include "config_ssid.h"
  23
  24
  25 struct eap_gtc_data {
  26         int prefix;
  27 };
  28
  29
  30 static void * eap_gtc_init(struct eap_sm *sm)
  31 {
  32         struct eap_gtc_data *data;
  33         data = malloc(sizeof(*data));
  34         if (data == NULL)
  35                 return NULL;
  36         memset(data, 0, sizeof(*data));
  37
  38         if (sm->m && sm->m->method == EAP_TYPE_FAST) {
  39                 wpa_printf(MSG_DEBUG, "EAP-GTC: EAP-FAST tunnel - use prefix "
  40                            "with challenge/response");
  41                 data->prefix = 1;
  42         }
  43         return data;
  44 }
  45
  46
  47 static void eap_gtc_deinit(struct eap_sm *sm, void *priv)
  48 {
  49         struct eap_gtc_data *data = priv;
  50         free(data);
  51 }
  52
  53
  54 static u8 * eap_gtc_process(struct eap_sm *sm, void *priv,
  55                             struct eap_method_ret *ret,
  56                             const u8 *reqData, size_t reqDataLen,
  57                             size_t *respDataLen)
  58 {
  59         struct eap_gtc_data *data = priv;
  60         struct wpa_ssid *config = eap_get_config(sm);
  61         const struct eap_hdr *req;
  62         struct eap_hdr *resp;
  63         const u8 *pos, *password;
  64         u8 *rpos;
  65         size_t password_len, len;
  66
  67         pos = eap_hdr_validate(EAP_TYPE_GTC, reqData, reqDataLen, &len);
  68         if (pos == NULL) {
  69                 ret->ignore = TRUE;
  70                 return NULL;
  71         }
  72         req = (const struct eap_hdr *) reqData;
  73
  74         wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-GTC: Request message", pos, len);
  75         if (data->prefix &&
  76             (len < 10 || memcmp(pos, "CHALLENGE=", 10) != 0)) {
  77                 wpa_printf(MSG_DEBUG, "EAP-GTC: Challenge did not start with "
  78                            "expected prefix");
  79
  80                 /* Send an empty response in order to allow tunneled
  81                  * acknowledgement of the failure. This will also cover the
  82                  * error case which seems to use EAP-MSCHAPv2 like error
  83                  * reporting with EAP-GTC inside EAP-FAST tunnel. */
  84                 *respDataLen = sizeof(struct eap_hdr) + 1;
  85                 resp = malloc(*respDataLen);
  86                 if (resp == NULL)
  87                         return NULL;
  88                 resp->code = EAP_CODE_RESPONSE;
  89                 resp->identifier = req->identifier;
  90                 resp->length = host_to_be16(*respDataLen);
  91                 rpos = (u8 *) (resp + 1);
  92                 *rpos++ = EAP_TYPE_GTC;
  93                 return (u8 *) resp;
  94         }
  95
  96         if (config == NULL ||
  97             (config->password == NULL && config->otp == NULL)) {
  98                 wpa_printf(MSG_INFO, "EAP-GTC: Password not configured");
  99                 eap_sm_request_otp(sm, config, (const char *) pos, len);
 100                 ret->ignore = TRUE;
 101                 return NULL;
 102         }
 103
 104         if (config->otp) {
 105                 password = config->otp;
 106                 password_len = config->otp_len;
 107         } else {
 108                 password = config->password;
 109                 password_len = config->password_len;
 110         }
 111
 112         ret->ignore = FALSE;
 113
 114         ret->methodState = data->prefix ? METHOD_MAY_CONT : METHOD_DONE;
 115         ret->decision = DECISION_COND_SUCC;
 116         ret->allowNotifications = FALSE;
 117
 118         *respDataLen = sizeof(struct eap_hdr) + 1 + password_len;
 119         if (data->prefix) {
 120                 *respDataLen += 9 + config->identity_len + 1;
 121         }
 122         resp = malloc(*respDataLen);
 123         if (resp == NULL)
 124                 return NULL;
 125         resp->code = EAP_CODE_RESPONSE;
 126         resp->identifier = req->identifier;
 127         resp->length = host_to_be16(*respDataLen);
 128         rpos = (u8 *) (resp + 1);
 129         *rpos++ = EAP_TYPE_GTC;
 130         if (data->prefix) {
 131                 memcpy(rpos, "RESPONSE=", 9);
 132                 rpos += 9;
 133                 memcpy(rpos, config->identity, config->identity_len);
 134                 rpos += config->identity_len;
 135                 *rpos++ = '\0';
 136         }
 137         memcpy(rpos, password, password_len);
 138         wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-GTC: Response",
 139                               (u8 *) (resp + 1) + 1,
 140                               *respDataLen - sizeof(struct eap_hdr) - 1);
 141
 142         if (config->otp) {
 143                 wpa_printf(MSG_DEBUG, "EAP-GTC: Forgetting used password");
 144                 memset(config->otp, 0, config->otp_len);
 145                 free(config->otp);
 146                 config->otp = NULL;
 147                 config->otp_len = 0;
 148         }
 149
 150         return (u8 *) resp;
 151 }
 152
 153
 154 const struct eap_method eap_method_gtc =
 155 {
 156         .method = EAP_TYPE_GTC,
 157         .name = "GTC",
 158         .init = eap_gtc_init,
 159         .deinit = eap_gtc_deinit,
 160         .process = eap_gtc_process,
 161 };