--- /dev/null
+/*
+ * Wi-Fi Protected Setup - attribute processing
+ * Copyright (c) 2008, 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 "crypto/sha256.h"
+#include "wps_i.h"
+
+
+int wps_process_authenticator(struct wps_data *wps, const u8 *authenticator,
+ const struct wpabuf *msg)
+{
+ u8 hash[SHA256_MAC_LEN];
+ const u8 *addr[2];
+ size_t len[2];
+
+ if (authenticator == NULL) {
+ wpa_printf(MSG_DEBUG, "WPS: No Authenticator attribute "
+ "included");
+ return -1;
+ }
+
+ if (wps->last_msg == NULL) {
+ wpa_printf(MSG_DEBUG, "WPS: Last message not available for "
+ "validating authenticator");
+ return -1;
+ }
+
+ /* Authenticator = HMAC-SHA256_AuthKey(M_prev || M_curr*)
+ * (M_curr* is M_curr without the Authenticator attribute)
+ */
+ addr[0] = wpabuf_head(wps->last_msg);
+ len[0] = wpabuf_len(wps->last_msg);
+ addr[1] = wpabuf_head(msg);
+ len[1] = wpabuf_len(msg) - 4 - WPS_AUTHENTICATOR_LEN;
+ hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 2, addr, len, hash);
+
+ if (os_memcmp(hash, authenticator, WPS_AUTHENTICATOR_LEN) != 0) {
+ wpa_printf(MSG_DEBUG, "WPS: Incorrect Authenticator");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+int wps_process_key_wrap_auth(struct wps_data *wps, struct wpabuf *msg,
+ const u8 *key_wrap_auth)
+{
+ u8 hash[SHA256_MAC_LEN];
+ const u8 *head;
+ size_t len;
+
+ if (key_wrap_auth == NULL) {
+ wpa_printf(MSG_DEBUG, "WPS: No KWA in decrypted attribute");
+ return -1;
+ }
+
+ head = wpabuf_head(msg);
+ len = wpabuf_len(msg) - 4 - WPS_KWA_LEN;
+ if (head + len != key_wrap_auth - 4) {
+ wpa_printf(MSG_DEBUG, "WPS: KWA not in the end of the "
+ "decrypted attribute");
+ return -1;
+ }
+
+ hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, head, len, hash);
+ if (os_memcmp(hash, key_wrap_auth, WPS_KWA_LEN) != 0) {
+ wpa_printf(MSG_DEBUG, "WPS: Invalid KWA");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int wps_process_cred_network_idx(struct wps_credential *cred,
+ const u8 *idx)
+{
+ if (idx == NULL) {
+ wpa_printf(MSG_DEBUG, "WPS: Credential did not include "
+ "Network Index");
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "WPS: Network Index: %d", *idx);
+
+ return 0;
+}
+
+
+static int wps_process_cred_ssid(struct wps_credential *cred, const u8 *ssid,
+ size_t ssid_len)
+{
+ if (ssid == NULL) {
+ wpa_printf(MSG_DEBUG, "WPS: Credential did not include SSID");
+ return -1;
+ }
+
+ /* Remove zero-padding since some Registrar implementations seem to use
+ * hardcoded 32-octet length for this attribute */
+ while (ssid_len > 0 && ssid[ssid_len - 1] == 0)
+ ssid_len--;
+
+ wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID", ssid, ssid_len);
+ if (ssid_len <= sizeof(cred->ssid)) {
+ os_memcpy(cred->ssid, ssid, ssid_len);
+ cred->ssid_len = ssid_len;
+ }
+
+ return 0;
+}
+
+
+static int wps_process_cred_auth_type(struct wps_credential *cred,
+ const u8 *auth_type)
+{
+ if (auth_type == NULL) {
+ wpa_printf(MSG_DEBUG, "WPS: Credential did not include "
+ "Authentication Type");
+ return -1;
+ }
+
+ cred->auth_type = WPA_GET_BE16(auth_type);
+ wpa_printf(MSG_DEBUG, "WPS: Authentication Type: 0x%x",
+ cred->auth_type);
+
+ return 0;
+}
+
+
+static int wps_process_cred_encr_type(struct wps_credential *cred,
+ const u8 *encr_type)
+{
+ if (encr_type == NULL) {
+ wpa_printf(MSG_DEBUG, "WPS: Credential did not include "
+ "Encryption Type");
+ return -1;
+ }
+
+ cred->encr_type = WPA_GET_BE16(encr_type);
+ wpa_printf(MSG_DEBUG, "WPS: Encryption Type: 0x%x",
+ cred->encr_type);
+
+ return 0;
+}
+
+
+static int wps_process_cred_network_key_idx(struct wps_credential *cred,
+ const u8 *key_idx)
+{
+ if (key_idx == NULL)
+ return 0; /* optional attribute */
+
+ wpa_printf(MSG_DEBUG, "WPS: Network Key Index: %d", *key_idx);
+ cred->key_idx = *key_idx;
+
+ return 0;
+}
+
+
+static int wps_process_cred_network_key(struct wps_credential *cred,
+ const u8 *key, size_t key_len)
+{
+ if (key == NULL) {
+ wpa_printf(MSG_DEBUG, "WPS: Credential did not include "
+ "Network Key");
+ if (cred->auth_type == WPS_AUTH_OPEN &&
+ cred->encr_type == WPS_ENCR_NONE) {
+ wpa_printf(MSG_DEBUG, "WPS: Workaround - Allow "
+ "missing mandatory Network Key attribute "
+ "for open network");
+ return 0;
+ }
+ return -1;
+ }
+
+ wpa_hexdump_key(MSG_DEBUG, "WPS: Network Key", key, key_len);
+ if (key_len <= sizeof(cred->key)) {
+ os_memcpy(cred->key, key, key_len);
+ cred->key_len = key_len;
+ }
+
+ return 0;
+}
+
+
+static int wps_process_cred_mac_addr(struct wps_credential *cred,
+ const u8 *mac_addr)
+{
+ if (mac_addr == NULL) {
+ wpa_printf(MSG_DEBUG, "WPS: Credential did not include "
+ "MAC Address");
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "WPS: MAC Address " MACSTR, MAC2STR(mac_addr));
+ os_memcpy(cred->mac_addr, mac_addr, ETH_ALEN);
+
+ return 0;
+}
+
+
+static int wps_process_cred_eap_type(struct wps_credential *cred,
+ const u8 *eap_type, size_t eap_type_len)
+{
+ if (eap_type == NULL)
+ return 0; /* optional attribute */
+
+ wpa_hexdump(MSG_DEBUG, "WPS: EAP Type", eap_type, eap_type_len);
+
+ return 0;
+}
+
+
+static int wps_process_cred_eap_identity(struct wps_credential *cred,
+ const u8 *identity,
+ size_t identity_len)
+{
+ if (identity == NULL)
+ return 0; /* optional attribute */
+
+ wpa_hexdump_ascii(MSG_DEBUG, "WPS: EAP Identity",
+ identity, identity_len);
+
+ return 0;
+}
+
+
+static int wps_process_cred_key_prov_auto(struct wps_credential *cred,
+ const u8 *key_prov_auto)
+{
+ if (key_prov_auto == NULL)
+ return 0; /* optional attribute */
+
+ wpa_printf(MSG_DEBUG, "WPS: Key Provided Automatically: %d",
+ *key_prov_auto);
+
+ return 0;
+}
+
+
+static int wps_process_cred_802_1x_enabled(struct wps_credential *cred,
+ const u8 *dot1x_enabled)
+{
+ if (dot1x_enabled == NULL)
+ return 0; /* optional attribute */
+
+ wpa_printf(MSG_DEBUG, "WPS: 802.1X Enabled: %d", *dot1x_enabled);
+
+ return 0;
+}
+
+
+static int wps_workaround_cred_key(struct wps_credential *cred)
+{
+ if (cred->auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK) &&
+ cred->key_len > 8 && cred->key_len < 64 &&
+ cred->key[cred->key_len - 1] == 0) {
+#ifdef CONFIG_WPS_STRICT
+ wpa_printf(MSG_INFO, "WPS: WPA/WPA2-Personal passphrase uses "
+ "forbidden NULL termination");
+ wpa_hexdump_ascii_key(MSG_INFO, "WPS: Network Key",
+ cred->key, cred->key_len);
+ return -1;
+#else /* CONFIG_WPS_STRICT */
+ /*
+ * A deployed external registrar is known to encode ASCII
+ * passphrases incorrectly. Remove the extra NULL termination
+ * to fix the encoding.
+ */
+ wpa_printf(MSG_DEBUG, "WPS: Workaround - remove NULL "
+ "termination from ASCII passphrase");
+ cred->key_len--;
+#endif /* CONFIG_WPS_STRICT */
+ }
+ return 0;
+}
+
+
+int wps_process_cred(struct wps_parse_attr *attr,
+ struct wps_credential *cred)
+{
+ wpa_printf(MSG_DEBUG, "WPS: Process Credential");
+
+ /* TODO: support multiple Network Keys */
+ if (wps_process_cred_network_idx(cred, attr->network_idx) ||
+ wps_process_cred_ssid(cred, attr->ssid, attr->ssid_len) ||
+ wps_process_cred_auth_type(cred, attr->auth_type) ||
+ wps_process_cred_encr_type(cred, attr->encr_type) ||
+ wps_process_cred_network_key_idx(cred, attr->network_key_idx) ||
+ wps_process_cred_network_key(cred, attr->network_key,
+ attr->network_key_len) ||
+ wps_process_cred_mac_addr(cred, attr->mac_addr) ||
+ wps_process_cred_eap_type(cred, attr->eap_type,
+ attr->eap_type_len) ||
+ wps_process_cred_eap_identity(cred, attr->eap_identity,
+ attr->eap_identity_len) ||
+ wps_process_cred_key_prov_auto(cred, attr->key_prov_auto) ||
+ wps_process_cred_802_1x_enabled(cred, attr->dot1x_enabled))
+ return -1;
+
+ return wps_workaround_cred_key(cred);
+}
+
+
+int wps_process_ap_settings(struct wps_parse_attr *attr,
+ struct wps_credential *cred)
+{
+ wpa_printf(MSG_DEBUG, "WPS: Processing AP Settings");
+ os_memset(cred, 0, sizeof(*cred));
+ /* TODO: optional attributes New Password and Device Password ID */
+ if (wps_process_cred_ssid(cred, attr->ssid, attr->ssid_len) ||
+ wps_process_cred_auth_type(cred, attr->auth_type) ||
+ wps_process_cred_encr_type(cred, attr->encr_type) ||
+ wps_process_cred_network_key_idx(cred, attr->network_key_idx) ||
+ wps_process_cred_network_key(cred, attr->network_key,
+ attr->network_key_len) ||
+ wps_process_cred_mac_addr(cred, attr->mac_addr))
+ return -1;
+
+ return wps_workaround_cred_key(cred);
+}
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