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367 lines
10 KiB
C
367 lines
10 KiB
C
/*
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* wpa_supplicant - WPA/RSN IE and KDE processing
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* Copyright (c) 2003-2018, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README 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 "wpa.h"
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#include "pmksa_cache.h"
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#include "common/ieee802_11_defs.h"
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#include "wpa_i.h"
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#include "wpa_ie.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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if (wpa_ie_len >= 6 && wpa_ie[0] == WLAN_EID_VENDOR_SPECIFIC &&
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wpa_ie[1] >= 4 && WPA_GET_BE32(&wpa_ie[2]) == OSEN_IE_VENDOR_TYPE)
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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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u32 suite;
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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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suite = wpa_cipher_to_suite(WPA_PROTO_WPA, group_cipher);
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if (suite == 0) {
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wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
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group_cipher);
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return -1;
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}
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RSN_SELECTOR_PUT(pos, suite);
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pos += WPA_SELECTOR_LEN;
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*pos++ = 1;
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*pos++ = 0;
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suite = wpa_cipher_to_suite(WPA_PROTO_WPA, pairwise_cipher);
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if (suite == 0 ||
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(!wpa_cipher_valid_pairwise(pairwise_cipher) &&
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pairwise_cipher != WPA_CIPHER_NONE)) {
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wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
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pairwise_cipher);
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return -1;
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}
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RSN_SELECTOR_PUT(pos, suite);
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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 if (key_mgmt == WPA_KEY_MGMT_CCKM) {
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RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_CCKM);
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} else {
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wpa_printf(MSG_WARNING, "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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u8 *pos;
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struct rsn_ie_hdr *hdr;
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u16 capab;
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u32 suite;
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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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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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suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
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if (suite == 0) {
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wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
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group_cipher);
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return -1;
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}
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RSN_SELECTOR_PUT(pos, suite);
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pos += RSN_SELECTOR_LEN;
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*pos++ = 1;
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*pos++ = 0;
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suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
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if (suite == 0 ||
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(!wpa_cipher_valid_pairwise(pairwise_cipher) &&
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pairwise_cipher != WPA_CIPHER_NONE)) {
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wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
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pairwise_cipher);
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return -1;
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}
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RSN_SELECTOR_PUT(pos, suite);
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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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} else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_CCKM);
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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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#ifdef CONFIG_SHA384
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} else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X_SHA384) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X_SHA384);
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#endif /* CONFIG_SHA384 */
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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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} 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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#ifdef CONFIG_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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} else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
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#endif /* CONFIG_SAE */
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} else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192);
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} else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B);
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#ifdef CONFIG_FILS
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} else if (key_mgmt & WPA_KEY_MGMT_FILS_SHA256) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FILS_SHA256);
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} else if (key_mgmt & WPA_KEY_MGMT_FILS_SHA384) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FILS_SHA384);
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#ifdef CONFIG_IEEE80211R
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} else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
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} else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
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#endif /* CONFIG_IEEE80211R */
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#endif /* CONFIG_FILS */
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#ifdef CONFIG_OWE
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} else if (key_mgmt & WPA_KEY_MGMT_OWE) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OWE);
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#endif /* CONFIG_OWE */
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#ifdef CONFIG_DPP
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} else if (key_mgmt & WPA_KEY_MGMT_DPP) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_DPP);
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#endif /* CONFIG_DPP */
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#ifdef CONFIG_HS20
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} else if (key_mgmt & WPA_KEY_MGMT_OSEN) {
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
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#endif /* CONFIG_HS20 */
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} else {
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wpa_printf(MSG_WARNING, "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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if (sm->mfp)
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capab |= WPA_CAPABILITY_MFPC;
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if (sm->mfp == 2)
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capab |= WPA_CAPABILITY_MFPR;
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if (sm->ocv)
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capab |= WPA_CAPABILITY_OCVC;
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if (sm->ext_key_id)
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capab |= WPA_CAPABILITY_EXT_KEY_ID_FOR_UNICAST;
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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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if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) {
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if (!sm->cur_pmksa) {
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/* 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, wpa_cipher_to_suite(WPA_PROTO_RSN,
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mgmt_group_cipher));
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pos += RSN_SELECTOR_LEN;
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}
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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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}
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#ifdef CONFIG_HS20
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static int wpa_gen_wpa_ie_osen(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, *len;
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u32 suite;
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if (wpa_ie_len < 2 + 4 + RSN_SELECTOR_LEN +
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2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN)
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return -1;
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pos = wpa_ie;
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*pos++ = WLAN_EID_VENDOR_SPECIFIC;
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len = pos++; /* to be filled */
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WPA_PUT_BE24(pos, OUI_WFA);
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pos += 3;
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*pos++ = HS20_OSEN_OUI_TYPE;
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/* Group Data Cipher Suite */
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suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
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if (suite == 0) {
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wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
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group_cipher);
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return -1;
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}
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RSN_SELECTOR_PUT(pos, suite);
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pos += RSN_SELECTOR_LEN;
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/* Pairwise Cipher Suite Count and List */
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WPA_PUT_LE16(pos, 1);
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pos += 2;
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suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
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if (suite == 0 ||
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(!wpa_cipher_valid_pairwise(pairwise_cipher) &&
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pairwise_cipher != WPA_CIPHER_NONE)) {
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wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
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pairwise_cipher);
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return -1;
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}
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RSN_SELECTOR_PUT(pos, suite);
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pos += RSN_SELECTOR_LEN;
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/* AKM Suite Count and List */
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WPA_PUT_LE16(pos, 1);
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pos += 2;
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RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
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pos += RSN_SELECTOR_LEN;
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*len = pos - len - 1;
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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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#endif /* CONFIG_HS20 */
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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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#ifdef CONFIG_HS20
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else if (sm->proto == WPA_PROTO_OSEN)
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return wpa_gen_wpa_ie_osen(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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#endif /* CONFIG_HS20 */
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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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int wpa_gen_rsnxe(struct wpa_sm *sm, u8 *rsnxe, size_t rsnxe_len)
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{
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u8 *pos = rsnxe;
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if (!wpa_key_mgmt_sae(sm->key_mgmt))
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return 0; /* SAE not in use */
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if (sm->sae_pwe != 1 && sm->sae_pwe != 2)
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return 0; /* no supported extended RSN capabilities */
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if (rsnxe_len < 3)
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return -1;
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*pos++ = WLAN_EID_RSNX;
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*pos++ = 1;
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/* bits 0-3 = 0 since only one octet of Extended RSN Capabilities is
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* used for now */
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*pos++ = BIT(WLAN_RSNX_CAPAB_SAE_H2E);
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return pos - rsnxe;
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}
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