Merge remote-tracking branch 'origin/debian' into debian

[mech_eap.git] / libeap / src / eap_server / eap_server_md5.c

diff --git a/libeap/src/eap_server/eap_server_md5.c b/libeap/src/eap_server/eap_server_md5.c
new file mode 100644 (file)
index 0000000..cf5ceb1
--- /dev/null
+++ b/libeap/src/eap_server/eap_server_md5.c
@@ -0,0 +1,171 @@
+/*
+ * hostapd / EAP-MD5 server
+ * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "crypto/random.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 (random_get_bytes(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);
+       if (chap_md5(id, sm->user->password, sm->user->password_len,
+                    data->challenge, CHALLENGE_LEN, hash)) {
+               wpa_printf(MSG_INFO, "EAP-MD5: CHAP MD5 operation failed");
+               data->state = FAILURE;
+               return;
+       }
+
+       if (os_memcmp_const(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;
+
+       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;
+
+       return eap_server_method_register(eap);
+}