1214501Srpaulo/* 2214501Srpaulo * hostapd / EAP-MD5 server 3252726Srpaulo * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi> 4214501Srpaulo * 5252726Srpaulo * This software may be distributed under the terms of the BSD license. 6252726Srpaulo * See README for more details. 7214501Srpaulo */ 8214501Srpaulo 9214501Srpaulo#include "includes.h" 10214501Srpaulo 11214501Srpaulo#include "common.h" 12252726Srpaulo#include "crypto/random.h" 13214501Srpaulo#include "eap_i.h" 14214501Srpaulo#include "eap_common/chap.h" 15214501Srpaulo 16214501Srpaulo 17214501Srpaulo#define CHALLENGE_LEN 16 18214501Srpaulo 19214501Srpaulostruct eap_md5_data { 20214501Srpaulo u8 challenge[CHALLENGE_LEN]; 21214501Srpaulo enum { CONTINUE, SUCCESS, FAILURE } state; 22214501Srpaulo}; 23214501Srpaulo 24214501Srpaulo 25214501Srpaulostatic void * eap_md5_init(struct eap_sm *sm) 26214501Srpaulo{ 27214501Srpaulo struct eap_md5_data *data; 28214501Srpaulo 29214501Srpaulo data = os_zalloc(sizeof(*data)); 30214501Srpaulo if (data == NULL) 31214501Srpaulo return NULL; 32214501Srpaulo data->state = CONTINUE; 33214501Srpaulo 34214501Srpaulo return data; 35214501Srpaulo} 36214501Srpaulo 37214501Srpaulo 38214501Srpaulostatic void eap_md5_reset(struct eap_sm *sm, void *priv) 39214501Srpaulo{ 40214501Srpaulo struct eap_md5_data *data = priv; 41214501Srpaulo os_free(data); 42214501Srpaulo} 43214501Srpaulo 44214501Srpaulo 45214501Srpaulostatic struct wpabuf * eap_md5_buildReq(struct eap_sm *sm, void *priv, u8 id) 46214501Srpaulo{ 47214501Srpaulo struct eap_md5_data *data = priv; 48214501Srpaulo struct wpabuf *req; 49214501Srpaulo 50252726Srpaulo if (random_get_bytes(data->challenge, CHALLENGE_LEN)) { 51214501Srpaulo wpa_printf(MSG_ERROR, "EAP-MD5: Failed to get random data"); 52214501Srpaulo data->state = FAILURE; 53214501Srpaulo return NULL; 54214501Srpaulo } 55214501Srpaulo 56214501Srpaulo req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MD5, 1 + CHALLENGE_LEN, 57214501Srpaulo EAP_CODE_REQUEST, id); 58214501Srpaulo if (req == NULL) { 59214501Srpaulo wpa_printf(MSG_ERROR, "EAP-MD5: Failed to allocate memory for " 60214501Srpaulo "request"); 61214501Srpaulo data->state = FAILURE; 62214501Srpaulo return NULL; 63214501Srpaulo } 64214501Srpaulo 65214501Srpaulo wpabuf_put_u8(req, CHALLENGE_LEN); 66214501Srpaulo wpabuf_put_data(req, data->challenge, CHALLENGE_LEN); 67214501Srpaulo wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Challenge", data->challenge, 68214501Srpaulo CHALLENGE_LEN); 69214501Srpaulo 70214501Srpaulo data->state = CONTINUE; 71214501Srpaulo 72214501Srpaulo return req; 73214501Srpaulo} 74214501Srpaulo 75214501Srpaulo 76214501Srpaulostatic Boolean eap_md5_check(struct eap_sm *sm, void *priv, 77214501Srpaulo struct wpabuf *respData) 78214501Srpaulo{ 79214501Srpaulo const u8 *pos; 80214501Srpaulo size_t len; 81214501Srpaulo 82214501Srpaulo pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5, respData, &len); 83214501Srpaulo if (pos == NULL || len < 1) { 84214501Srpaulo wpa_printf(MSG_INFO, "EAP-MD5: Invalid frame"); 85214501Srpaulo return TRUE; 86214501Srpaulo } 87214501Srpaulo if (*pos != CHAP_MD5_LEN || 1 + CHAP_MD5_LEN > len) { 88214501Srpaulo wpa_printf(MSG_INFO, "EAP-MD5: Invalid response " 89214501Srpaulo "(response_len=%d payload_len=%lu", 90214501Srpaulo *pos, (unsigned long) len); 91214501Srpaulo return TRUE; 92214501Srpaulo } 93214501Srpaulo 94214501Srpaulo return FALSE; 95214501Srpaulo} 96214501Srpaulo 97214501Srpaulo 98214501Srpaulostatic void eap_md5_process(struct eap_sm *sm, void *priv, 99214501Srpaulo struct wpabuf *respData) 100214501Srpaulo{ 101214501Srpaulo struct eap_md5_data *data = priv; 102214501Srpaulo const u8 *pos; 103214501Srpaulo size_t plen; 104214501Srpaulo u8 hash[CHAP_MD5_LEN], id; 105214501Srpaulo 106214501Srpaulo if (sm->user == NULL || sm->user->password == NULL || 107214501Srpaulo sm->user->password_hash) { 108214501Srpaulo wpa_printf(MSG_INFO, "EAP-MD5: Plaintext password not " 109214501Srpaulo "configured"); 110214501Srpaulo data->state = FAILURE; 111214501Srpaulo return; 112214501Srpaulo } 113214501Srpaulo 114214501Srpaulo pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5, respData, &plen); 115214501Srpaulo if (pos == NULL || *pos != CHAP_MD5_LEN || plen < 1 + CHAP_MD5_LEN) 116214501Srpaulo return; /* Should not happen - frame already validated */ 117214501Srpaulo 118214501Srpaulo pos++; /* Skip response len */ 119214501Srpaulo wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", pos, CHAP_MD5_LEN); 120214501Srpaulo 121214501Srpaulo id = eap_get_id(respData); 122252726Srpaulo if (chap_md5(id, sm->user->password, sm->user->password_len, 123252726Srpaulo data->challenge, CHALLENGE_LEN, hash)) { 124252726Srpaulo wpa_printf(MSG_INFO, "EAP-MD5: CHAP MD5 operation failed"); 125252726Srpaulo data->state = FAILURE; 126252726Srpaulo return; 127252726Srpaulo } 128214501Srpaulo 129281806Srpaulo if (os_memcmp_const(hash, pos, CHAP_MD5_LEN) == 0) { 130214501Srpaulo wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Success"); 131214501Srpaulo data->state = SUCCESS; 132214501Srpaulo } else { 133214501Srpaulo wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Failure"); 134214501Srpaulo data->state = FAILURE; 135214501Srpaulo } 136214501Srpaulo} 137214501Srpaulo 138214501Srpaulo 139214501Srpaulostatic Boolean eap_md5_isDone(struct eap_sm *sm, void *priv) 140214501Srpaulo{ 141214501Srpaulo struct eap_md5_data *data = priv; 142214501Srpaulo return data->state != CONTINUE; 143214501Srpaulo} 144214501Srpaulo 145214501Srpaulo 146214501Srpaulostatic Boolean eap_md5_isSuccess(struct eap_sm *sm, void *priv) 147214501Srpaulo{ 148214501Srpaulo struct eap_md5_data *data = priv; 149214501Srpaulo return data->state == SUCCESS; 150214501Srpaulo} 151214501Srpaulo 152214501Srpaulo 153214501Srpauloint eap_server_md5_register(void) 154214501Srpaulo{ 155214501Srpaulo struct eap_method *eap; 156214501Srpaulo 157214501Srpaulo eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION, 158214501Srpaulo EAP_VENDOR_IETF, EAP_TYPE_MD5, "MD5"); 159214501Srpaulo if (eap == NULL) 160214501Srpaulo return -1; 161214501Srpaulo 162214501Srpaulo eap->init = eap_md5_init; 163214501Srpaulo eap->reset = eap_md5_reset; 164214501Srpaulo eap->buildReq = eap_md5_buildReq; 165214501Srpaulo eap->check = eap_md5_check; 166214501Srpaulo eap->process = eap_md5_process; 167214501Srpaulo eap->isDone = eap_md5_isDone; 168214501Srpaulo eap->isSuccess = eap_md5_isSuccess; 169214501Srpaulo 170337817Scy return eap_server_method_register(eap); 171214501Srpaulo} 172