mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-12-02 20:28:24 -05:00
2049a875bc
Add some more functionality for BSS Transition Management: - advertise support for BSS Transition Management in extended capabilities element - add hostapd.conf parameter bss_transition=1 for enabling support for BSS Transition Management - add "hostapd_cli disassoc_imminent <STA> <num TBTTs>" for sending disassociation imminent notifications for testing purposes - wpa_supplicant: trigger a new scan to find another BSS if the current AP indicates disassociation imminent (TODO: the old AP needs to be marked to use lower priority to avoid re-selecting it) Signed-hostap: Jouni Malinen <j@w1.fi>
424 lines
12 KiB
C
424 lines
12 KiB
C
/*
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* wpa_supplicant - WNM
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* Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
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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 "utils/includes.h"
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#include "utils/common.h"
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#include "common/ieee802_11_defs.h"
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#include "rsn_supp/wpa.h"
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#include "wpa_supplicant_i.h"
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#include "driver_i.h"
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#include "scan.h"
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#define MAX_TFS_IE_LEN 1024
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/* get the TFS IE from driver */
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static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
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u16 *buf_len, enum wnm_oper oper)
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{
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wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
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return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
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}
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/* set the TFS IE to driver */
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static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
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const u8 *addr, u8 *buf, u16 *buf_len,
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enum wnm_oper oper)
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{
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wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
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return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, buf_len);
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}
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/* MLME-SLEEPMODE.request */
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int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
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u8 action, u16 intval, struct wpabuf *tfs_req)
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{
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struct ieee80211_mgmt *mgmt;
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int res;
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size_t len;
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struct wnm_sleep_element *wnmsleep_ie;
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u8 *wnmtfs_ie;
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u8 wnmsleep_ie_len;
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u16 wnmtfs_ie_len; /* possibly multiple IE(s) */
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enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
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WNM_SLEEP_TFS_REQ_IE_NONE;
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wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
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"action=%s to " MACSTR,
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action == 0 ? "enter" : "exit",
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MAC2STR(wpa_s->bssid));
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/* WNM-Sleep Mode IE */
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wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
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wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
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if (wnmsleep_ie == NULL)
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return -1;
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wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
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wnmsleep_ie->len = wnmsleep_ie_len - 2;
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wnmsleep_ie->action_type = action;
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wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
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wnmsleep_ie->intval = host_to_le16(intval);
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wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
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(u8 *) wnmsleep_ie, wnmsleep_ie_len);
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/* TFS IE(s) */
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if (tfs_req) {
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wnmtfs_ie_len = wpabuf_len(tfs_req);
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wnmtfs_ie = os_malloc(wnmtfs_ie_len);
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if (wnmtfs_ie == NULL) {
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os_free(wnmsleep_ie);
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return -1;
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}
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os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len);
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} else {
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wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
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if (wnmtfs_ie == NULL) {
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os_free(wnmsleep_ie);
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return -1;
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}
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if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
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tfs_oper)) {
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wnmtfs_ie_len = 0;
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os_free(wnmtfs_ie);
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wnmtfs_ie = NULL;
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}
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}
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wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
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(u8 *) wnmtfs_ie, wnmtfs_ie_len);
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mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
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if (mgmt == NULL) {
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wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
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"WNM-Sleep Request action frame");
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os_free(wnmsleep_ie);
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os_free(wnmtfs_ie);
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return -1;
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}
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os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
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os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
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os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
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mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
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WLAN_FC_STYPE_ACTION);
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mgmt->u.action.category = WLAN_ACTION_WNM;
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mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
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mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
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os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
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wnmsleep_ie_len);
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/* copy TFS IE here */
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if (wnmtfs_ie_len > 0) {
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os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
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wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
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}
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len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
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wnmtfs_ie_len;
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res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
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wpa_s->own_addr, wpa_s->bssid,
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&mgmt->u.action.category, len, 0);
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if (res < 0)
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wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
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"(action=%d, intval=%d)", action, intval);
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os_free(wnmsleep_ie);
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os_free(wnmtfs_ie);
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os_free(mgmt);
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return res;
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}
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static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
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u8 *tfsresp_ie_start,
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u8 *tfsresp_ie_end)
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{
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wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
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wpa_s->bssid, NULL, NULL);
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/* remove GTK/IGTK ?? */
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/* set the TFS Resp IE(s) */
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if (tfsresp_ie_start && tfsresp_ie_end &&
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tfsresp_ie_end - tfsresp_ie_start >= 0) {
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u16 tfsresp_ie_len;
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tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
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tfsresp_ie_start;
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wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
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/* pass the TFS Resp IE(s) to driver for processing */
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if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
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tfsresp_ie_start,
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&tfsresp_ie_len,
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WNM_SLEEP_TFS_RESP_IE_SET))
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wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
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}
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}
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static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
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const u8 *frm, u16 key_len_total)
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{
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u8 *ptr, *end;
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u8 gtk_len;
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wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM, wpa_s->bssid,
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NULL, NULL);
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/* Install GTK/IGTK */
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/* point to key data field */
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ptr = (u8 *) frm + 1 + 1 + 2;
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end = ptr + key_len_total;
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wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
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while (ptr + 1 < end) {
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if (ptr + 2 + ptr[1] > end) {
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wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
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"length");
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if (end > ptr) {
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wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
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ptr, end - ptr);
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}
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break;
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}
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if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
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if (ptr[1] < 11 + 5) {
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wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
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"subelem");
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break;
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}
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gtk_len = *(ptr + 4);
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if (ptr[1] < 11 + gtk_len ||
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gtk_len < 5 || gtk_len > 32) {
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wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
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"subelem");
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break;
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}
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wpa_wnmsleep_install_key(
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wpa_s->wpa,
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WNM_SLEEP_SUBELEM_GTK,
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ptr);
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ptr += 13 + gtk_len;
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#ifdef CONFIG_IEEE80211W
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} else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
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if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
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wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
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"subelem");
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break;
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}
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wpa_wnmsleep_install_key(wpa_s->wpa,
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WNM_SLEEP_SUBELEM_IGTK, ptr);
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ptr += 10 + WPA_IGTK_LEN;
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#endif /* CONFIG_IEEE80211W */
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} else
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break; /* skip the loop */
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}
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}
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static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
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const u8 *frm, int len)
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{
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/*
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* Action [1] | Diaglog Token [1] | Key Data Len [2] | Key Data |
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* WNM-Sleep Mode IE | TFS Response IE
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*/
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u8 *pos = (u8 *) frm; /* point to action field */
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u16 key_len_total = le_to_host16(*((u16 *)(frm+2)));
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struct wnm_sleep_element *wnmsleep_ie = NULL;
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/* multiple TFS Resp IE (assuming consecutive) */
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u8 *tfsresp_ie_start = NULL;
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u8 *tfsresp_ie_end = NULL;
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wpa_printf(MSG_DEBUG, "action=%d token = %d key_len_total = %d",
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frm[0], frm[1], key_len_total);
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pos += 4 + key_len_total;
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if (pos > frm + len) {
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wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
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return;
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}
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while (pos - frm < len) {
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u8 ie_len = *(pos + 1);
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if (pos + 2 + ie_len > frm + len) {
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wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
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break;
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}
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wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
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if (*pos == WLAN_EID_WNMSLEEP)
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wnmsleep_ie = (struct wnm_sleep_element *) pos;
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else if (*pos == WLAN_EID_TFS_RESP) {
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if (!tfsresp_ie_start)
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tfsresp_ie_start = pos;
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tfsresp_ie_end = pos;
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} else
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wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
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pos += ie_len + 2;
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}
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if (!wnmsleep_ie) {
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wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
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return;
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}
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if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
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wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
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wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
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"frame (action=%d, intval=%d)",
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wnmsleep_ie->action_type, wnmsleep_ie->intval);
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if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
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wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
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tfsresp_ie_end);
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} else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
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wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
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}
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} else {
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wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
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"(action=%d, intval=%d)",
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wnmsleep_ie->action_type, wnmsleep_ie->intval);
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if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
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wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
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wpa_s->bssid, NULL, NULL);
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else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
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wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
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wpa_s->bssid, NULL, NULL);
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}
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}
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static void wnm_send_bss_transition_mgmt_resp(struct wpa_supplicant *wpa_s,
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u8 dialog_token, u8 status,
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u8 delay, const u8 *target_bssid)
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{
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u8 buf[1000], *pos;
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struct ieee80211_mgmt *mgmt;
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size_t len;
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wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
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"to " MACSTR " dialog_token=%u status=%u delay=%d",
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MAC2STR(wpa_s->bssid), dialog_token, status, delay);
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mgmt = (struct ieee80211_mgmt *) buf;
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os_memset(&buf, 0, sizeof(buf));
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os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
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os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
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os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
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mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
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WLAN_FC_STYPE_ACTION);
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mgmt->u.action.category = WLAN_ACTION_WNM;
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mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
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mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
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mgmt->u.action.u.bss_tm_resp.status_code = status;
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mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
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pos = mgmt->u.action.u.bss_tm_resp.variable;
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if (target_bssid) {
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os_memcpy(pos, target_bssid, ETH_ALEN);
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pos += ETH_ALEN;
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}
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len = pos - (u8 *) &mgmt->u.action.category;
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wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
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wpa_s->own_addr, wpa_s->bssid,
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&mgmt->u.action.category, len, 0);
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}
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static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
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const u8 *pos, const u8 *end,
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int reply)
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{
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u8 dialog_token;
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u8 mode;
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u16 disassoc_timer;
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if (pos + 5 > end)
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return;
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dialog_token = pos[0];
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mode = pos[1];
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disassoc_timer = WPA_GET_LE16(pos + 2);
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wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
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"dialog_token=%u request_mode=0x%x "
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"disassoc_timer=%u validity_interval=%u",
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dialog_token, mode, disassoc_timer, pos[4]);
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pos += 5;
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if (mode & 0x08)
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pos += 12; /* BSS Termination Duration */
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if (mode & 0x10) {
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char url[256];
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if (pos + 1 > end || pos + 1 + pos[0] > end) {
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wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
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"Management Request (URL)");
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return;
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}
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os_memcpy(url, pos + 1, pos[0]);
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url[pos[0]] = '\0';
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wpa_msg(wpa_s, MSG_INFO, "WNM: ESS Disassociation Imminent - "
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"session_info_url=%s", url);
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}
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if (mode & 0x04) {
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wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
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"Disassociation Timer %u", disassoc_timer);
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if (disassoc_timer && !wpa_s->scanning) {
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/* TODO: mark current BSS less preferred for
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* selection */
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wpa_printf(MSG_DEBUG, "Trying to find another BSS");
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wpa_supplicant_req_scan(wpa_s, 0, 0);
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}
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}
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if (reply) {
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/* TODO: add support for reporting Accept */
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wnm_send_bss_transition_mgmt_resp(wpa_s, dialog_token,
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1 /* Reject - unspecified */,
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0, NULL);
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}
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}
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void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
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struct rx_action *action)
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{
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const u8 *pos, *end;
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u8 act;
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if (action->data == NULL || action->len == 0)
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return;
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pos = action->data;
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end = pos + action->len;
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act = *pos++;
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wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
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act, MAC2STR(action->sa));
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if (wpa_s->wpa_state < WPA_ASSOCIATED ||
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os_memcmp(action->sa, wpa_s->bssid, ETH_ALEN) != 0) {
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wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
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"frame");
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return;
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}
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switch (act) {
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case WNM_BSS_TRANS_MGMT_REQ:
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ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
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!(action->da[0] & 0x01));
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break;
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case WNM_SLEEP_MODE_RESP:
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ieee802_11_rx_wnmsleep_resp(wpa_s, action->data, action->len);
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break;
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default:
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break;
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}
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}
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