30d6220394
1. Anti-Clogging Token Request support 2. Return correct status from SAE modules for invalid scenarios 3. Add PMK Caching support for WPA3
407 lines
12 KiB
C
407 lines
12 KiB
C
/*
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* wpa_supplicant - WPA/RSN IE and KDE processing
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* Copyright (c) 2003-2008, 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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#ifdef ESP_SUPPLICANT
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "rsn_supp/wpa.h"
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#include "common/ieee802_11_defs.h"
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#include "rsn_supp/wpa_ie.h"
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#include "rsn_supp/pmksa_cache.h"
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/**
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* wpa_parse_wpa_ie - Parse WPA/RSN IE
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* @wpa_ie: Pointer to WPA or RSN IE
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* @wpa_ie_len: Length of the WPA/RSN IE
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* @data: Pointer to data area for parsing results
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* Returns: 0 on success, -1 on failure
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*
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* Parse the contents of WPA or RSN IE and write the parsed data into data.
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*/
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int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len,
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struct wpa_ie_data *data)
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{
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if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN)
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return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
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else
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return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
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}
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static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
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int pairwise_cipher, int group_cipher,
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int key_mgmt)
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{
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u8 *pos;
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struct wpa_ie_hdr *hdr;
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if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
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2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
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return -1;
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hdr = (struct wpa_ie_hdr *) wpa_ie;
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hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
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RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
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WPA_PUT_LE16(hdr->version, WPA_VERSION);
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pos = (u8 *) (hdr + 1);
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if (group_cipher == WPA_CIPHER_CCMP) {
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RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP);
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} else if (group_cipher == WPA_CIPHER_TKIP) {
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RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP);
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} else if (group_cipher == WPA_CIPHER_WEP104) {
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RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP104);
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} else if (group_cipher == WPA_CIPHER_WEP40) {
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RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP40);
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} else {
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wpa_printf(MSG_DEBUG, "Invalid group cipher (%d).",
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group_cipher);
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return -1;
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}
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pos += WPA_SELECTOR_LEN;
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*pos++ = 1;
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*pos++ = 0;
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if (pairwise_cipher == WPA_CIPHER_CCMP) {
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RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP);
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} else if (pairwise_cipher == WPA_CIPHER_TKIP) {
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RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP);
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} else if (pairwise_cipher == WPA_CIPHER_NONE) {
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RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_NONE);
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} else {
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wpa_printf(MSG_DEBUG, "Invalid pairwise cipher (%d).",
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pairwise_cipher);
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return -1;
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}
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pos += WPA_SELECTOR_LEN;
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*pos++ = 1;
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*pos++ = 0;
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if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
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RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
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} else if (key_mgmt == WPA_KEY_MGMT_PSK) {
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RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
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} else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
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RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
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} else {
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wpa_printf(MSG_DEBUG, "Invalid key management type (%d).",
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key_mgmt);
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return -1;
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}
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pos += WPA_SELECTOR_LEN;
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/* WPA Capabilities; use defaults, so no need to include it */
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hdr->len = (pos - wpa_ie) - 2;
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WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
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return pos - wpa_ie;
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}
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static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
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int pairwise_cipher, int group_cipher,
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int key_mgmt, int mgmt_group_cipher,
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struct wpa_sm *sm)
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{
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#ifndef CONFIG_NO_WPA2
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u8 *pos;
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struct rsn_ie_hdr *hdr;
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u16 capab;
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u8 min_len = 0;
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if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
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2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
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(sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
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wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
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(unsigned long) rsn_ie_len);
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return -1;
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}
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/* For WPA2-PSK, if the RSNE in AP beacon/probe response doesn't specify the
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* pairwise cipher or AKM suite, the RSNE IE in association request
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* should only contain group cihpher suite, otherwise the WPA2 improvements
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* certification will fail.
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*/
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if ( (sm->ap_notify_completed_rsne == true) || (key_mgmt == WPA_KEY_MGMT_IEEE8021X) ) {
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min_len = sizeof(*hdr) + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2;
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} else {
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min_len = sizeof(*hdr) + RSN_SELECTOR_LEN;
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}
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if (rsn_ie_len < min_len) {
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wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)", (unsigned long) rsn_ie_len);
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}
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hdr = (struct rsn_ie_hdr *) rsn_ie;
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hdr->elem_id = WLAN_EID_RSN;
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WPA_PUT_LE16(hdr->version, RSN_VERSION);
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pos = (u8 *) (hdr + 1);
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if (group_cipher == WPA_CIPHER_CCMP) {
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RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
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} else if (group_cipher == WPA_CIPHER_TKIP) {
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RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
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} else if (group_cipher == WPA_CIPHER_WEP104) {
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RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP104);
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} else if (group_cipher == WPA_CIPHER_WEP40) {
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RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP40);
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} else {
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wpa_printf(MSG_DEBUG, "Invalid group cipher (%d).",
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group_cipher);
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return -1;
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}
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pos += RSN_SELECTOR_LEN;
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if ( (sm->ap_notify_completed_rsne == false) && (key_mgmt != WPA_KEY_MGMT_IEEE8021X) ) {
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hdr->len = (pos - rsn_ie) - 2;
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return (pos - rsn_ie);
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}
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*pos++ = 1;
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*pos++ = 0;
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if (pairwise_cipher == WPA_CIPHER_CCMP) {
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RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
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} else if (pairwise_cipher == WPA_CIPHER_TKIP) {
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RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
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} else if (pairwise_cipher == WPA_CIPHER_NONE) {
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RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NONE);
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} else {
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wpa_printf(MSG_DEBUG, "Invalid pairwise cipher (%d).",
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pairwise_cipher);
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return -1;
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}
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pos += RSN_SELECTOR_LEN;
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*pos++ = 1;
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*pos++ = 0;
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if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
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} else if (key_mgmt == WPA_KEY_MGMT_PSK) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
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#ifdef CONFIG_IEEE80211R
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} else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
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} else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
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#endif /* CONFIG_IEEE80211R */
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#ifdef CONFIG_IEEE80211W
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} else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
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} else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
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#endif /* CONFIG_IEEE80211W */
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#ifdef CONFIG_WPA3_SAE
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} else if (key_mgmt == WPA_KEY_MGMT_SAE) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE);
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#endif /* CONFIG_WPA3_SAE */
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} else {
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wpa_printf(MSG_DEBUG, "Invalid key management type (%d).",
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key_mgmt);
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return -1;
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}
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pos += RSN_SELECTOR_LEN;
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/* RSN Capabilities */
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capab = 0;
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#ifdef CONFIG_IEEE80211W
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if (sm->pmf_cfg.capable) {
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capab |= WPA_CAPABILITY_MFPC;
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if (sm->pmf_cfg.required || key_mgmt == WPA_KEY_MGMT_SAE) {
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capab |= WPA_CAPABILITY_MFPR;
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}
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}
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#endif /* CONFIG_IEEE80211W */
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WPA_PUT_LE16(pos, capab);
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pos += 2;
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if (sm->cur_pmksa) {
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/* PMKID Count (2 octets, little endian) */
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*pos++ = 1;
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*pos++ = 0;
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/* PMKID */
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os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
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pos += PMKID_LEN;
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}
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#ifdef CONFIG_IEEE80211W
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if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
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if (!sm->cur_pmksa) {
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/* 0 PMKID Count */
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WPA_PUT_LE16(pos, 0);
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pos += 2;
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}
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/* Management Group Cipher Suite */
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RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
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pos += RSN_SELECTOR_LEN;
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}
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#endif /* CONFIG_IEEE80211W */
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hdr->len = (pos - rsn_ie) - 2;
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WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
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return pos - rsn_ie;
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#else /* CONFIG_NO_WPA2 */
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return -1;
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#endif /* CONFIG_NO_WPA2 */
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}
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/**
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* wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
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* @sm: Pointer to WPA state machine data from wpa_sm_init()
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* @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
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* @wpa_ie_len: Maximum length of the generated WPA/RSN IE
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* Returns: Length of the generated WPA/RSN IE or -1 on failure
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*/
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int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
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{
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if (sm->proto == WPA_PROTO_RSN)
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return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
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sm->pairwise_cipher,
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sm->group_cipher,
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sm->key_mgmt, sm->mgmt_group_cipher,
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sm);
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else
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return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
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sm->pairwise_cipher,
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sm->group_cipher,
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sm->key_mgmt);
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}
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/**
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* wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
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* @pos: Pointer to the IE header
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* @end: Pointer to the end of the Key Data buffer
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* @ie: Pointer to parsed IE data
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* Returns: 0 on success, 1 if end mark is found, -1 on failure
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*/
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static int wpa_parse_generic(const u8 *pos, const u8 *end,
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struct wpa_eapol_ie_parse *ie)
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{
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if (pos[1] == 0)
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return 1;
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if (pos[1] >= 6 &&
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RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
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pos[2 + WPA_SELECTOR_LEN] == 1 &&
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pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
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ie->wpa_ie = pos;
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ie->wpa_ie_len = pos[1] + 2;
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wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key",
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ie->wpa_ie, ie->wpa_ie_len);
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return 0;
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}
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if (pos + 1 + RSN_SELECTOR_LEN < end &&
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pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
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RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
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ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
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wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key",
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pos, pos[1] + 2);
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return 0;
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}
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if (pos[1] > RSN_SELECTOR_LEN + 2 &&
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RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
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ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
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ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
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wpa_hexdump(MSG_DEBUG, "WPA: GTK in EAPOL-Key",
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pos, pos[1] + 2);
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return 0;
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}
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if (pos[1] > RSN_SELECTOR_LEN + 2 &&
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RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
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ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
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ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
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wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key",
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pos, pos[1] + 2);
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return 0;
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}
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#ifdef CONFIG_IEEE80211W
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if (pos[1] > RSN_SELECTOR_LEN + 2 &&
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RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
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ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
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ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
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wpa_hexdump(MSG_DEBUG, "WPA: IGTK in EAPOL-Key",
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pos, pos[1] + 2);
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return 0;
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}
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#endif
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return 0;
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}
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/**
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* wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
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* @buf: Pointer to the Key Data buffer
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* @len: Key Data Length
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* @ie: Pointer to parsed IE data
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* Returns: 0 on success, -1 on failure
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*/
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int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
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struct wpa_eapol_ie_parse *ie)
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{
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const u8 *pos, *end;
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int ret = 0;
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memset(ie, 0, sizeof(*ie));
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for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) {
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if (pos[0] == 0xdd &&
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((pos == buf + len - 1) || pos[1] == 0)) {
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/* Ignore padding */
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break;
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}
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if (pos + 2 + pos[1] > end) {
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#ifdef DEBUG_PRINT
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wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
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"underflow (ie=%d len=%d pos=%d)",
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pos[0], pos[1], (int) (pos - buf));
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#endif
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wpa_hexdump(MSG_DEBUG, "WPA: Key Data",
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buf, len);
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ret = -1;
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break;
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}
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if (*pos == WLAN_EID_RSN) {
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ie->rsn_ie = pos;
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ie->rsn_ie_len = pos[1] + 2;
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wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key",
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ie->rsn_ie, ie->rsn_ie_len);
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} else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
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ret = wpa_parse_generic(pos, end, ie);
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if (ret < 0)
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break;
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if (ret > 0) {
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ret = 0;
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break;
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}
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} else {
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wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
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"Key Data IE", pos, 2 + pos[1]);
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}
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}
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return ret;
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}
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#endif // ESP_SUPPLICANT
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