00001
00016 #include <stdlib.h>
00017 #include <stdio.h>
00018
00019 #include "common.h"
00020 #include "eap_i.h"
00021 #include "wpa_supplicant.h"
00022 #include "config_ssid.h"
00023 #include "md5.h"
00024 #include "crypto.h"
00025
00026
00027 static void * eap_md5_init(struct eap_sm *sm)
00028 {
00029 return (void *) 1;
00030 }
00031
00032
00033 static void eap_md5_deinit(struct eap_sm *sm, void *priv)
00034 {
00035 }
00036
00037
00038 static u8 * eap_md5_process(struct eap_sm *sm, void *priv,
00039 struct eap_method_ret *ret,
00040 const u8 *reqData, size_t reqDataLen,
00041 size_t *respDataLen)
00042 {
00043 struct wpa_ssid *config = eap_get_config(sm);
00044 const struct eap_hdr *req;
00045 struct eap_hdr *resp;
00046 const u8 *pos, *challenge;
00047 u8 *rpos;
00048 int challenge_len;
00049 size_t len;
00050 const u8 *addr[3];
00051 size_t elen[3];
00052
00053 if (config == NULL || config->password == NULL) {
00054 wpa_printf(MSG_INFO, "EAP-MD5: Password not configured");
00055 eap_sm_request_password(sm, config);
00056 ret->ignore = TRUE;
00057 return NULL;
00058 }
00059
00060 pos = eap_hdr_validate(EAP_TYPE_MD5, reqData, reqDataLen, &len);
00061 if (pos == NULL || len == 0) {
00062 wpa_printf(MSG_INFO, "EAP-MD5: Invalid frame (pos=%p len=%lu)",
00063 pos, (unsigned long) len);
00064 ret->ignore = TRUE;
00065 return NULL;
00066 }
00067 req = (const struct eap_hdr *) reqData;
00068 challenge_len = *pos++;
00069 if (challenge_len == 0 ||
00070 challenge_len > len - 1) {
00071 wpa_printf(MSG_INFO, "EAP-MD5: Invalid challenge "
00072 "(challenge_len=%d len=%lu)",
00073 challenge_len, (unsigned long) len);
00074 ret->ignore = TRUE;
00075 return NULL;
00076 }
00077 ret->ignore = FALSE;
00078 challenge = pos;
00079 wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Challenge",
00080 challenge, challenge_len);
00081
00082 wpa_printf(MSG_DEBUG, "EAP-MD5: generating Challenge Response");
00083 ret->methodState = METHOD_DONE;
00084 ret->decision = DECISION_UNCOND_SUCC;
00085 ret->allowNotifications = TRUE;
00086
00087 *respDataLen = sizeof(struct eap_hdr) + 1 + 1 + MD5_MAC_LEN;
00088 resp = malloc(*respDataLen);
00089 if (resp == NULL)
00090 return NULL;
00091 resp->code = EAP_CODE_RESPONSE;
00092 resp->identifier = req->identifier;
00093 resp->length = host_to_be16(*respDataLen);
00094 rpos = (u8 *) (resp + 1);
00095 *rpos++ = EAP_TYPE_MD5;
00096 *rpos++ = MD5_MAC_LEN;
00097
00098 addr[0] = &resp->identifier;
00099 elen[0] = 1;
00100 addr[1] = config->password;
00101 elen[1] = config->password_len;
00102 addr[2] = challenge;
00103 elen[2] = challenge_len;
00104 md5_vector(3, addr, elen, rpos);
00105 wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", rpos, MD5_MAC_LEN);
00106
00107 return (u8 *) resp;
00108 }
00109
00110
00111 const struct eap_method eap_method_md5 =
00112 {
00113 .method = EAP_TYPE_MD5,
00114 .name = "MD5",
00115 .init = eap_md5_init,
00116 .deinit = eap_md5_deinit,
00117 .process = eap_md5_process,
00118 };
00119
