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-rw-r--r--src/eap_server/eap_server_md5.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/src/eap_server/eap_server_md5.c b/src/eap_server/eap_server_md5.c
new file mode 100644
index 0000000..dee2dc5
--- /dev/null
+++ b/src/eap_server/eap_server_md5.c
@@ -0,0 +1,176 @@
+/*
+ * hostapd / EAP-MD5 server
+ * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "eap_i.h"
+#include "eap_common/chap.h"
+
+
+#define CHALLENGE_LEN 16
+
+struct eap_md5_data {
+ u8 challenge[CHALLENGE_LEN];
+ enum { CONTINUE, SUCCESS, FAILURE } state;
+};
+
+
+static void * eap_md5_init(struct eap_sm *sm)
+{
+ struct eap_md5_data *data;
+
+ data = os_zalloc(sizeof(*data));
+ if (data == NULL)
+ return NULL;
+ data->state = CONTINUE;
+
+ return data;
+}
+
+
+static void eap_md5_reset(struct eap_sm *sm, void *priv)
+{
+ struct eap_md5_data *data = priv;
+ os_free(data);
+}
+
+
+static struct wpabuf * eap_md5_buildReq(struct eap_sm *sm, void *priv, u8 id)
+{
+ struct eap_md5_data *data = priv;
+ struct wpabuf *req;
+
+ if (os_get_random(data->challenge, CHALLENGE_LEN)) {
+ wpa_printf(MSG_ERROR, "EAP-MD5: Failed to get random data");
+ data->state = FAILURE;
+ return NULL;
+ }
+
+ req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MD5, 1 + CHALLENGE_LEN,
+ EAP_CODE_REQUEST, id);
+ if (req == NULL) {
+ wpa_printf(MSG_ERROR, "EAP-MD5: Failed to allocate memory for "
+ "request");
+ data->state = FAILURE;
+ return NULL;
+ }
+
+ wpabuf_put_u8(req, CHALLENGE_LEN);
+ wpabuf_put_data(req, data->challenge, CHALLENGE_LEN);
+ wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Challenge", data->challenge,
+ CHALLENGE_LEN);
+
+ data->state = CONTINUE;
+
+ return req;
+}
+
+
+static Boolean eap_md5_check(struct eap_sm *sm, void *priv,
+ struct wpabuf *respData)
+{
+ const u8 *pos;
+ size_t len;
+
+ pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5, respData, &len);
+ if (pos == NULL || len < 1) {
+ wpa_printf(MSG_INFO, "EAP-MD5: Invalid frame");
+ return TRUE;
+ }
+ if (*pos != CHAP_MD5_LEN || 1 + CHAP_MD5_LEN > len) {
+ wpa_printf(MSG_INFO, "EAP-MD5: Invalid response "
+ "(response_len=%d payload_len=%lu",
+ *pos, (unsigned long) len);
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+
+static void eap_md5_process(struct eap_sm *sm, void *priv,
+ struct wpabuf *respData)
+{
+ struct eap_md5_data *data = priv;
+ const u8 *pos;
+ size_t plen;
+ u8 hash[CHAP_MD5_LEN], id;
+
+ if (sm->user == NULL || sm->user->password == NULL ||
+ sm->user->password_hash) {
+ wpa_printf(MSG_INFO, "EAP-MD5: Plaintext password not "
+ "configured");
+ data->state = FAILURE;
+ return;
+ }
+
+ pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5, respData, &plen);
+ if (pos == NULL || *pos != CHAP_MD5_LEN || plen < 1 + CHAP_MD5_LEN)
+ return; /* Should not happen - frame already validated */
+
+ pos++; /* Skip response len */
+ wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", pos, CHAP_MD5_LEN);
+
+ id = eap_get_id(respData);
+ chap_md5(id, sm->user->password, sm->user->password_len,
+ data->challenge, CHALLENGE_LEN, hash);
+
+ if (os_memcmp(hash, pos, CHAP_MD5_LEN) == 0) {
+ wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Success");
+ data->state = SUCCESS;
+ } else {
+ wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Failure");
+ data->state = FAILURE;
+ }
+}
+
+
+static Boolean eap_md5_isDone(struct eap_sm *sm, void *priv)
+{
+ struct eap_md5_data *data = priv;
+ return data->state != CONTINUE;
+}
+
+
+static Boolean eap_md5_isSuccess(struct eap_sm *sm, void *priv)
+{
+ struct eap_md5_data *data = priv;
+ return data->state == SUCCESS;
+}
+
+
+int eap_server_md5_register(void)
+{
+ struct eap_method *eap;
+ int ret;
+
+ eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
+ EAP_VENDOR_IETF, EAP_TYPE_MD5, "MD5");
+ if (eap == NULL)
+ return -1;
+
+ eap->init = eap_md5_init;
+ eap->reset = eap_md5_reset;
+ eap->buildReq = eap_md5_buildReq;
+ eap->check = eap_md5_check;
+ eap->process = eap_md5_process;
+ eap->isDone = eap_md5_isDone;
+ eap->isSuccess = eap_md5_isSuccess;
+
+ ret = eap_server_method_register(eap);
+ if (ret)
+ eap_server_method_free(eap);
+ return ret;
+}