2008-11-23 18:34:26 +01:00
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/*
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* Wi-Fi Protected Setup - common functionality
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* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "dh_groups.h"
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#include "sha256.h"
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#include "aes_wrap.h"
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#include "crypto.h"
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#include "wps_i.h"
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2008-11-29 11:44:02 +01:00
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#include "wps_dev_attr.h"
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2008-11-23 18:34:26 +01:00
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2008-11-29 11:11:56 +01:00
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void wps_kdf(const u8 *key, const u8 *label_prefix, size_t label_prefix_len,
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const char *label, u8 *res, size_t res_len)
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2008-11-23 18:34:26 +01:00
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{
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u8 i_buf[4], key_bits[4];
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2008-11-29 11:11:56 +01:00
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const u8 *addr[4];
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size_t len[4];
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2008-11-23 18:34:26 +01:00
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int i, iter;
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u8 hash[SHA256_MAC_LEN], *opos;
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size_t left;
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WPA_PUT_BE32(key_bits, res_len * 8);
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addr[0] = i_buf;
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len[0] = sizeof(i_buf);
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2008-11-29 11:11:56 +01:00
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addr[1] = label_prefix;
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len[1] = label_prefix_len;
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addr[2] = (const u8 *) label;
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len[2] = os_strlen(label);
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addr[3] = key_bits;
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len[3] = sizeof(key_bits);
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2008-11-23 18:34:26 +01:00
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iter = (res_len + SHA256_MAC_LEN - 1) / SHA256_MAC_LEN;
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opos = res;
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left = res_len;
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for (i = 1; i <= iter; i++) {
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WPA_PUT_BE32(i_buf, i);
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2008-11-29 11:11:56 +01:00
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hmac_sha256_vector(key, SHA256_MAC_LEN, 4, addr, len, hash);
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2008-11-23 18:34:26 +01:00
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if (i < iter) {
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os_memcpy(opos, hash, SHA256_MAC_LEN);
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opos += SHA256_MAC_LEN;
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left -= SHA256_MAC_LEN;
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} else
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os_memcpy(opos, hash, left);
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}
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}
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int wps_derive_keys(struct wps_data *wps)
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{
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struct wpabuf *pubkey, *dh_shared;
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u8 dhkey[SHA256_MAC_LEN], kdk[SHA256_MAC_LEN];
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const u8 *addr[3];
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size_t len[3];
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u8 keys[WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN + WPS_EMSK_LEN];
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if (wps->dh_privkey == NULL) {
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wpa_printf(MSG_DEBUG, "WPS: Own DH private key not available");
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return -1;
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}
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pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r;
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if (pubkey == NULL) {
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wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available");
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return -1;
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}
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dh_shared = dh_derive_shared(pubkey, wps->dh_privkey,
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dh_groups_get(WPS_DH_GROUP));
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2009-01-22 18:32:58 +01:00
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dh_shared = wpabuf_zeropad(dh_shared, 192);
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2008-11-23 18:34:26 +01:00
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if (dh_shared == NULL) {
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wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key");
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return -1;
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}
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/* Own DH private key is not needed anymore */
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wpabuf_free(wps->dh_privkey);
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wps->dh_privkey = NULL;
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wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared);
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/* DHKey = SHA-256(g^AB mod p) */
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addr[0] = wpabuf_head(dh_shared);
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len[0] = wpabuf_len(dh_shared);
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sha256_vector(1, addr, len, dhkey);
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wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey));
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wpabuf_free(dh_shared);
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/* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */
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addr[0] = wps->nonce_e;
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len[0] = WPS_NONCE_LEN;
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addr[1] = wps->mac_addr_e;
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len[1] = ETH_ALEN;
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addr[2] = wps->nonce_r;
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len[2] = WPS_NONCE_LEN;
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hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk);
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wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk));
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2008-11-29 11:11:56 +01:00
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wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation",
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2008-11-23 18:34:26 +01:00
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keys, sizeof(keys));
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os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN);
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os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN);
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os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN,
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WPS_EMSK_LEN);
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wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey",
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wps->authkey, WPS_AUTHKEY_LEN);
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wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey",
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wps->keywrapkey, WPS_KEYWRAPKEY_LEN);
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wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN);
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return 0;
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}
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2008-11-29 11:11:56 +01:00
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int wps_derive_mgmt_keys(struct wps_data *wps)
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{
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u8 nonces[2 * WPS_NONCE_LEN];
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u8 keys[WPS_MGMTAUTHKEY_LEN + WPS_MGMTENCKEY_LEN];
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u8 hash[SHA256_MAC_LEN];
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const u8 *addr[2];
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size_t len[2];
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const char *auth_label = "WFA-WLAN-Management-MgmtAuthKey";
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const char *enc_label = "WFA-WLAN-Management-MgmtEncKey";
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/* MgmtAuthKey || MgmtEncKey =
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* kdf(EMSK, N1 || N2 || "WFA-WLAN-Management-Keys", 384) */
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os_memcpy(nonces, wps->nonce_e, WPS_NONCE_LEN);
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os_memcpy(nonces + WPS_NONCE_LEN, wps->nonce_r, WPS_NONCE_LEN);
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wps_kdf(wps->emsk, nonces, sizeof(nonces), "WFA-WLAN-Management-Keys",
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keys, sizeof(keys));
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os_memcpy(wps->mgmt_auth_key, keys, WPS_MGMTAUTHKEY_LEN);
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os_memcpy(wps->mgmt_enc_key, keys + WPS_MGMTAUTHKEY_LEN,
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WPS_MGMTENCKEY_LEN);
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addr[0] = nonces;
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len[0] = sizeof(nonces);
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/* MgmtEncKeyID = first 128 bits of
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* SHA-256(N1 || N2 || "WFA-WLAN-Management-MgmtAuthKey") */
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addr[1] = (const u8 *) auth_label;
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len[1] = os_strlen(auth_label);
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sha256_vector(2, addr, len, hash);
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os_memcpy(wps->mgmt_auth_key_id, hash, WPS_MGMT_KEY_ID_LEN);
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/* MgmtEncKeyID = first 128 bits of
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* SHA-256(N1 || N2 || "WFA-WLAN-Management-MgmtEncKey") */
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addr[1] = (const u8 *) enc_label;
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len[1] = os_strlen(enc_label);
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sha256_vector(2, addr, len, hash);
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os_memcpy(wps->mgmt_enc_key_id, hash, WPS_MGMT_KEY_ID_LEN);
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wpa_hexdump_key(MSG_DEBUG, "WPS: MgmtAuthKey",
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wps->mgmt_auth_key, WPS_MGMTAUTHKEY_LEN);
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wpa_hexdump(MSG_DEBUG, "WPS: MgmtAuthKeyID",
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wps->mgmt_auth_key_id, WPS_MGMT_KEY_ID_LEN);
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wpa_hexdump_key(MSG_DEBUG, "WPS: MgmtEncKey",
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wps->mgmt_enc_key, WPS_MGMTENCKEY_LEN);
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wpa_hexdump(MSG_DEBUG, "WPS: MgmtEncKeyID",
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wps->mgmt_enc_key_id, WPS_MGMT_KEY_ID_LEN);
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return 0;
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}
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2008-11-23 18:34:26 +01:00
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void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
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size_t dev_passwd_len)
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{
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u8 hash[SHA256_MAC_LEN];
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hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
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(dev_passwd_len + 1) / 2, hash);
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os_memcpy(wps->psk1, hash, WPS_PSK_LEN);
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hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
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dev_passwd + (dev_passwd_len + 1) / 2,
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dev_passwd_len / 2, hash);
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os_memcpy(wps->psk2, hash, WPS_PSK_LEN);
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wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password",
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dev_passwd, dev_passwd_len);
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wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN);
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wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN);
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}
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struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
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size_t encr_len)
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{
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struct wpabuf *decrypted;
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const size_t block_size = 16;
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size_t i;
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u8 pad;
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const u8 *pos;
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/* AES-128-CBC */
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if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size)
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{
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wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received");
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return NULL;
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}
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decrypted = wpabuf_alloc(encr_len - block_size);
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if (decrypted == NULL)
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return NULL;
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wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len);
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wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size);
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if (aes_128_cbc_decrypt(wps->keywrapkey, encr, wpabuf_mhead(decrypted),
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wpabuf_len(decrypted))) {
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wpabuf_free(decrypted);
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return NULL;
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}
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wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings",
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decrypted);
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pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1;
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pad = *pos;
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if (pad > wpabuf_len(decrypted)) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value");
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wpabuf_free(decrypted);
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return NULL;
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}
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for (i = 0; i < pad; i++) {
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if (*pos-- != pad) {
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wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad "
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"string");
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wpabuf_free(decrypted);
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return NULL;
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}
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}
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decrypted->used -= pad;
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return decrypted;
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}
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2008-11-29 13:02:09 +01:00
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/**
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* wps_pin_checksum - Compute PIN checksum
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* @pin: Seven digit PIN (i.e., eight digit PIN without the checksum digit)
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* Returns: Checksum digit
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*/
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unsigned int wps_pin_checksum(unsigned int pin)
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{
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unsigned int accum = 0;
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while (pin) {
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accum += 3 * (pin % 10);
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pin /= 10;
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accum += pin % 10;
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pin /= 10;
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}
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return (10 - accum % 10) % 10;
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}
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/**
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* wps_pin_valid - Check whether a PIN has a valid checksum
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* @pin: Eight digit PIN (i.e., including the checksum digit)
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* Returns: 1 if checksum digit is valid, or 0 if not
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*/
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unsigned int wps_pin_valid(unsigned int pin)
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{
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return wps_pin_checksum(pin / 10) == (pin % 10);
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}
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/**
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* wps_generate_pin - Generate a random PIN
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* Returns: Eight digit PIN (i.e., including the checksum digit)
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*/
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unsigned int wps_generate_pin(void)
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{
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unsigned int val;
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/* Generate seven random digits for the PIN */
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if (os_get_random((unsigned char *) &val, sizeof(val)) < 0) {
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struct os_time now;
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os_get_time(&now);
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val = os_random() ^ now.sec ^ now.usec;
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}
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val %= 10000000;
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/* Append checksum digit */
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return val * 10 + wps_pin_checksum(val);
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}
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2008-12-19 21:19:41 +01:00
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void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg)
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{
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union wps_event_data data;
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if (wps->event_cb == NULL)
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return;
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os_memset(&data, 0, sizeof(data));
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data.fail.msg = msg;
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wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, &data);
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}
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2008-12-19 21:34:18 +01:00
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void wps_success_event(struct wps_context *wps)
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{
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if (wps->event_cb == NULL)
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return;
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wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, NULL);
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}
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2009-01-23 20:57:43 +01:00
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void wps_pwd_auth_fail_event(struct wps_context *wps, int enrollee, int part)
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{
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union wps_event_data data;
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if (wps->event_cb == NULL)
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return;
|
|
|
|
|
|
|
|
os_memset(&data, 0, sizeof(data));
|
|
|
|
data.pwd_auth_fail.enrollee = enrollee;
|
|
|
|
data.pwd_auth_fail.part = part;
|
|
|
|
wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, &data);
|
|
|
|
}
|
2009-02-26 20:57:38 +01:00
|
|
|
|
|
|
|
|
|
|
|
static struct wpabuf * wps_get_oob_cred(struct wps_context *wps)
|
|
|
|
{
|
|
|
|
struct wps_data data;
|
|
|
|
struct wpabuf *plain;
|
|
|
|
|
|
|
|
plain = wpabuf_alloc(500);
|
|
|
|
if (plain == NULL) {
|
|
|
|
wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
|
|
|
|
"credential");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
os_memset(&data, 0, sizeof(data));
|
|
|
|
data.wps = wps;
|
|
|
|
data.auth_type = wps->auth_types;
|
|
|
|
data.encr_type = wps->encr_types;
|
|
|
|
if (wps_build_version(plain) || wps_build_cred(&data, plain)) {
|
|
|
|
wpabuf_free(plain);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return plain;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static struct wpabuf * wps_get_oob_dev_pwd(struct wps_context *wps)
|
|
|
|
{
|
|
|
|
struct wpabuf *data;
|
|
|
|
|
|
|
|
data = wpabuf_alloc(9 + WPS_OOB_DEVICE_PASSWORD_ATTR_LEN);
|
|
|
|
if (data == NULL) {
|
|
|
|
wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
|
|
|
|
"device password attribute");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
wpabuf_free(wps->oob_conf.dev_password);
|
|
|
|
wps->oob_conf.dev_password =
|
|
|
|
wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN * 2 + 1);
|
|
|
|
if (wps->oob_conf.dev_password == NULL) {
|
|
|
|
wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
|
|
|
|
"device password");
|
|
|
|
wpabuf_free(data);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (wps_build_version(data) ||
|
|
|
|
wps_build_oob_dev_password(data, wps)) {
|
|
|
|
wpa_printf(MSG_ERROR, "WPS: Build OOB device password "
|
|
|
|
"attribute error");
|
|
|
|
wpabuf_free(data);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return data;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int wps_parse_oob_dev_pwd(struct wps_context *wps,
|
|
|
|
struct wpabuf *data)
|
|
|
|
{
|
|
|
|
struct oob_conf_data *oob_conf = &wps->oob_conf;
|
|
|
|
struct wps_parse_attr attr;
|
|
|
|
const u8 *pos;
|
|
|
|
|
|
|
|
if (wps_parse_msg(data, &attr) < 0 ||
|
|
|
|
attr.oob_dev_password == NULL) {
|
|
|
|
wpa_printf(MSG_ERROR, "WPS: OOB device password not found");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
pos = attr.oob_dev_password;
|
|
|
|
|
|
|
|
oob_conf->pubkey_hash =
|
|
|
|
wpabuf_alloc_copy(pos, WPS_OOB_PUBKEY_HASH_LEN);
|
|
|
|
if (oob_conf->pubkey_hash == NULL) {
|
|
|
|
wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
|
|
|
|
"public key hash");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
pos += WPS_OOB_PUBKEY_HASH_LEN;
|
|
|
|
|
|
|
|
wps->oob_dev_pw_id = WPA_GET_BE16(pos);
|
|
|
|
pos += sizeof(wps->oob_dev_pw_id);
|
|
|
|
|
|
|
|
oob_conf->dev_password =
|
|
|
|
wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN * 2 + 1);
|
|
|
|
if (oob_conf->dev_password == NULL) {
|
|
|
|
wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
|
|
|
|
"device password");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
wpa_snprintf_hex_uppercase(wpabuf_put(oob_conf->dev_password,
|
|
|
|
wpabuf_size(oob_conf->dev_password)),
|
|
|
|
wpabuf_size(oob_conf->dev_password), pos,
|
|
|
|
WPS_OOB_DEVICE_PASSWORD_LEN);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int wps_parse_oob_cred(struct wps_context *wps, struct wpabuf *data)
|
|
|
|
{
|
|
|
|
struct wpabuf msg;
|
|
|
|
struct wps_parse_attr attr;
|
|
|
|
size_t i;
|
|
|
|
|
|
|
|
if (wps_parse_msg(data, &attr) < 0 || attr.num_cred <= 0) {
|
|
|
|
wpa_printf(MSG_ERROR, "WPS: OOB credential not found");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < attr.num_cred; i++) {
|
|
|
|
struct wps_credential local_cred;
|
|
|
|
struct wps_parse_attr cattr;
|
|
|
|
|
|
|
|
os_memset(&local_cred, 0, sizeof(local_cred));
|
|
|
|
wpabuf_set(&msg, attr.cred[i], attr.cred_len[i]);
|
|
|
|
if (wps_parse_msg(&msg, &cattr) < 0 ||
|
|
|
|
wps_process_cred(&cattr, &local_cred)) {
|
|
|
|
wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB "
|
|
|
|
"credential");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
wps->cred_cb(wps->cb_ctx, &local_cred);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-02-26 21:07:55 +01:00
|
|
|
int wps_process_oob(struct wps_context *wps, struct oob_device_data *oob_dev,
|
|
|
|
int registrar)
|
2009-02-26 20:57:38 +01:00
|
|
|
{
|
|
|
|
struct wpabuf *data;
|
|
|
|
int ret, write_f, oob_method = wps->oob_conf.oob_method;
|
2009-02-26 21:04:49 +01:00
|
|
|
void *oob_priv;
|
2009-02-26 20:57:38 +01:00
|
|
|
|
|
|
|
write_f = oob_method == OOB_METHOD_DEV_PWD_E ? !registrar : registrar;
|
|
|
|
|
2009-02-26 21:07:55 +01:00
|
|
|
oob_priv = oob_dev->init_func(wps, oob_dev, registrar);
|
2009-02-26 21:04:49 +01:00
|
|
|
if (oob_priv == NULL) {
|
2009-02-26 20:57:38 +01:00
|
|
|
wpa_printf(MSG_ERROR, "WPS: Failed to initialize OOB device");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (write_f) {
|
|
|
|
if (oob_method == OOB_METHOD_CRED)
|
|
|
|
data = wps_get_oob_cred(wps);
|
|
|
|
else
|
|
|
|
data = wps_get_oob_dev_pwd(wps);
|
|
|
|
|
|
|
|
ret = 0;
|
2009-02-26 21:07:55 +01:00
|
|
|
if (data == NULL || oob_dev->write_func(oob_priv, data) < 0)
|
2009-02-26 20:57:38 +01:00
|
|
|
ret = -1;
|
|
|
|
} else {
|
2009-02-26 21:04:49 +01:00
|
|
|
data = oob_dev->read_func(oob_priv);
|
|
|
|
if (data == NULL) {
|
|
|
|
oob_dev->deinit_func(oob_priv);
|
2009-02-26 20:57:38 +01:00
|
|
|
return -1;
|
2009-02-26 21:04:49 +01:00
|
|
|
}
|
2009-02-26 20:57:38 +01:00
|
|
|
|
|
|
|
if (oob_method == OOB_METHOD_CRED)
|
|
|
|
ret = wps_parse_oob_cred(wps, data);
|
|
|
|
else
|
|
|
|
ret = wps_parse_oob_dev_pwd(wps, data);
|
|
|
|
}
|
|
|
|
wpabuf_free(data);
|
|
|
|
if (ret < 0) {
|
|
|
|
wpa_printf(MSG_ERROR, "WPS: Failed to process OOB data");
|
2009-02-26 21:04:49 +01:00
|
|
|
oob_dev->deinit_func(oob_priv);
|
2009-02-26 20:57:38 +01:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2009-02-26 21:04:49 +01:00
|
|
|
oob_dev->deinit_func(oob_priv);
|
2009-02-26 20:57:38 +01:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
struct oob_device_data * wps_get_oob_device(char *device_type)
|
|
|
|
{
|
2009-02-26 21:01:36 +01:00
|
|
|
#ifdef CONFIG_WPS_UFD
|
2009-02-26 20:57:38 +01:00
|
|
|
if (os_strstr(device_type, "ufd") != NULL)
|
|
|
|
return &oob_ufd_device_data;
|
2009-02-26 21:01:36 +01:00
|
|
|
#endif /* CONFIG_WPS_UFD */
|
2009-02-26 20:57:38 +01:00
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int wps_get_oob_method(char *method)
|
|
|
|
{
|
|
|
|
if (os_strstr(method, "pin-e") != NULL)
|
|
|
|
return OOB_METHOD_DEV_PWD_E;
|
|
|
|
if (os_strstr(method, "pin-r") != NULL)
|
|
|
|
return OOB_METHOD_DEV_PWD_R;
|
|
|
|
if (os_strstr(method, "cred") != NULL)
|
|
|
|
return OOB_METHOD_CRED;
|
|
|
|
return OOB_METHOD_UNKNOWN;
|
|
|
|
}
|