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![Julia Lawall](/assets/img/avatar_default.png)
Comparing an int to a size, which is unsigned, causes the int to become unsigned, giving the wrong result. usb_get_descriptor can return a negative error code. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ int x; expression e,e1; identifier f; @@ *x = f(...); ... when != x = e1 when != if (x < 0 || ...) { ... return ...; } *x < sizeof(e) // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
599 lines
17 KiB
C
599 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Wireless USB Host Controller
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* Security support: encryption enablement, etc
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*
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* Copyright (C) 2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* FIXME: docs
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/usb/ch9.h>
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#include <linux/random.h>
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#include <linux/export.h>
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#include "wusbhc.h"
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#include <asm/unaligned.h>
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static void wusbhc_gtk_rekey_work(struct work_struct *work);
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int wusbhc_sec_create(struct wusbhc *wusbhc)
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{
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/*
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* WQ is singlethread because we need to serialize rekey operations.
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* Use a separate workqueue for security operations instead of the
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* wusbd workqueue because security operations may need to communicate
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* directly with downstream wireless devices using synchronous URBs.
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* If a device is not responding, this could block other host
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* controller operations.
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*/
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wusbhc->wq_security = create_singlethread_workqueue("wusbd_security");
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if (wusbhc->wq_security == NULL) {
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pr_err("WUSB-core: Cannot create wusbd_security workqueue\n");
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return -ENOMEM;
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}
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wusbhc->gtk.descr.bLength = sizeof(wusbhc->gtk.descr) +
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sizeof(wusbhc->gtk.data);
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wusbhc->gtk.descr.bDescriptorType = USB_DT_KEY;
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wusbhc->gtk.descr.bReserved = 0;
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wusbhc->gtk_index = 0;
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INIT_WORK(&wusbhc->gtk_rekey_work, wusbhc_gtk_rekey_work);
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return 0;
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}
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/* Called when the HC is destroyed */
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void wusbhc_sec_destroy(struct wusbhc *wusbhc)
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{
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destroy_workqueue(wusbhc->wq_security);
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}
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/**
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* wusbhc_next_tkid - generate a new, currently unused, TKID
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* @wusbhc: the WUSB host controller
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* @wusb_dev: the device whose PTK the TKID is for
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* (or NULL for a TKID for a GTK)
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*
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* The generated TKID consists of two parts: the device's authenticated
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* address (or 0 or a GTK); and an incrementing number. This ensures
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* that TKIDs cannot be shared between devices and by the time the
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* incrementing number wraps around the older TKIDs will no longer be
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* in use (a maximum of two keys may be active at any one time).
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*/
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static u32 wusbhc_next_tkid(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
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{
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u32 *tkid;
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u32 addr;
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if (wusb_dev == NULL) {
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tkid = &wusbhc->gtk_tkid;
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addr = 0;
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} else {
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tkid = &wusb_port_by_idx(wusbhc, wusb_dev->port_idx)->ptk_tkid;
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addr = wusb_dev->addr & 0x7f;
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}
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*tkid = (addr << 8) | ((*tkid + 1) & 0xff);
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return *tkid;
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}
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static void wusbhc_generate_gtk(struct wusbhc *wusbhc)
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{
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const size_t key_size = sizeof(wusbhc->gtk.data);
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u32 tkid;
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tkid = wusbhc_next_tkid(wusbhc, NULL);
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wusbhc->gtk.descr.tTKID[0] = (tkid >> 0) & 0xff;
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wusbhc->gtk.descr.tTKID[1] = (tkid >> 8) & 0xff;
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wusbhc->gtk.descr.tTKID[2] = (tkid >> 16) & 0xff;
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get_random_bytes(wusbhc->gtk.descr.bKeyData, key_size);
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}
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/**
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* wusbhc_sec_start - start the security management process
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* @wusbhc: the WUSB host controller
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*
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* Generate and set an initial GTK on the host controller.
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*
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* Called when the HC is started.
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*/
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int wusbhc_sec_start(struct wusbhc *wusbhc)
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{
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const size_t key_size = sizeof(wusbhc->gtk.data);
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int result;
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wusbhc_generate_gtk(wusbhc);
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result = wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid,
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&wusbhc->gtk.descr.bKeyData, key_size);
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if (result < 0)
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dev_err(wusbhc->dev, "cannot set GTK for the host: %d\n",
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result);
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return result;
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}
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/**
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* wusbhc_sec_stop - stop the security management process
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* @wusbhc: the WUSB host controller
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*
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* Wait for any pending GTK rekeys to stop.
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*/
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void wusbhc_sec_stop(struct wusbhc *wusbhc)
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{
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cancel_work_sync(&wusbhc->gtk_rekey_work);
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}
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/** @returns encryption type name */
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const char *wusb_et_name(u8 x)
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{
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switch (x) {
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case USB_ENC_TYPE_UNSECURE: return "unsecure";
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case USB_ENC_TYPE_WIRED: return "wired";
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case USB_ENC_TYPE_CCM_1: return "CCM-1";
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case USB_ENC_TYPE_RSA_1: return "RSA-1";
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default: return "unknown";
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}
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}
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EXPORT_SYMBOL_GPL(wusb_et_name);
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/*
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* Set the device encryption method
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*
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* We tell the device which encryption method to use; we do this when
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* setting up the device's security.
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*/
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static int wusb_dev_set_encryption(struct usb_device *usb_dev, int value)
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{
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int result;
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struct device *dev = &usb_dev->dev;
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struct wusb_dev *wusb_dev = usb_dev->wusb_dev;
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if (value) {
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value = wusb_dev->ccm1_etd.bEncryptionValue;
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} else {
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/* FIXME: should be wusb_dev->etd[UNSECURE].bEncryptionValue */
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value = 0;
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}
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/* Set device's */
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result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
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USB_REQ_SET_ENCRYPTION,
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USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
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value, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
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if (result < 0)
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dev_err(dev, "Can't set device's WUSB encryption to "
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"%s (value %d): %d\n",
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wusb_et_name(wusb_dev->ccm1_etd.bEncryptionType),
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wusb_dev->ccm1_etd.bEncryptionValue, result);
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return result;
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}
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/*
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* Set the GTK to be used by a device.
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*
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* The device must be authenticated.
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*/
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static int wusb_dev_set_gtk(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
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{
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struct usb_device *usb_dev = wusb_dev->usb_dev;
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u8 key_index = wusb_key_index(wusbhc->gtk_index,
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WUSB_KEY_INDEX_TYPE_GTK, WUSB_KEY_INDEX_ORIGINATOR_HOST);
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return usb_control_msg(
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usb_dev, usb_sndctrlpipe(usb_dev, 0),
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USB_REQ_SET_DESCRIPTOR,
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USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
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USB_DT_KEY << 8 | key_index, 0,
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&wusbhc->gtk.descr, wusbhc->gtk.descr.bLength,
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USB_CTRL_SET_TIMEOUT);
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}
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/* FIXME: prototype for adding security */
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int wusb_dev_sec_add(struct wusbhc *wusbhc,
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struct usb_device *usb_dev, struct wusb_dev *wusb_dev)
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{
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int result, bytes, secd_size;
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struct device *dev = &usb_dev->dev;
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struct usb_security_descriptor *secd, *new_secd;
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const struct usb_encryption_descriptor *etd, *ccm1_etd = NULL;
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const void *itr, *top;
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char buf[64];
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secd = kmalloc(sizeof(*secd), GFP_KERNEL);
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if (secd == NULL) {
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result = -ENOMEM;
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goto out;
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}
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result = usb_get_descriptor(usb_dev, USB_DT_SECURITY,
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0, secd, sizeof(*secd));
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if (result < (int)sizeof(*secd)) {
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dev_err(dev, "Can't read security descriptor or "
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"not enough data: %d\n", result);
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goto out;
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}
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secd_size = le16_to_cpu(secd->wTotalLength);
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new_secd = krealloc(secd, secd_size, GFP_KERNEL);
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if (new_secd == NULL) {
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dev_err(dev,
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"Can't allocate space for security descriptors\n");
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result = -ENOMEM;
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goto out;
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}
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secd = new_secd;
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result = usb_get_descriptor(usb_dev, USB_DT_SECURITY,
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0, secd, secd_size);
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if (result < secd_size) {
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dev_err(dev, "Can't read security descriptor or "
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"not enough data: %d\n", result);
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goto out;
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}
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bytes = 0;
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itr = &secd[1];
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top = (void *)secd + result;
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while (itr < top) {
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etd = itr;
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if (top - itr < sizeof(*etd)) {
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dev_err(dev, "BUG: bad device security descriptor; "
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"not enough data (%zu vs %zu bytes left)\n",
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top - itr, sizeof(*etd));
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break;
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}
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if (etd->bLength < sizeof(*etd)) {
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dev_err(dev, "BUG: bad device encryption descriptor; "
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"descriptor is too short "
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"(%u vs %zu needed)\n",
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etd->bLength, sizeof(*etd));
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break;
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}
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itr += etd->bLength;
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bytes += snprintf(buf + bytes, sizeof(buf) - bytes,
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"%s (0x%02x/%02x) ",
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wusb_et_name(etd->bEncryptionType),
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etd->bEncryptionValue, etd->bAuthKeyIndex);
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if (etd->bEncryptionType == USB_ENC_TYPE_CCM_1)
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ccm1_etd = etd;
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}
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/* This code only supports CCM1 as of now. */
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/* FIXME: user has to choose which sec mode to use?
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* In theory we want CCM */
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if (ccm1_etd == NULL) {
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dev_err(dev, "WUSB device doesn't support CCM1 encryption, "
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"can't use!\n");
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result = -EINVAL;
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goto out;
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}
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wusb_dev->ccm1_etd = *ccm1_etd;
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dev_dbg(dev, "supported encryption: %s; using %s (0x%02x/%02x)\n",
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buf, wusb_et_name(ccm1_etd->bEncryptionType),
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ccm1_etd->bEncryptionValue, ccm1_etd->bAuthKeyIndex);
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result = 0;
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out:
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kfree(secd);
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return result;
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}
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void wusb_dev_sec_rm(struct wusb_dev *wusb_dev)
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{
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/* Nothing so far */
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}
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/**
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* Update the address of an unauthenticated WUSB device
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*
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* Once we have successfully authenticated, we take it to addr0 state
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* and then to a normal address.
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*
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* Before the device's address (as known by it) was usb_dev->devnum |
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* 0x80 (unauthenticated address). With this we update it to usb_dev->devnum.
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*/
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int wusb_dev_update_address(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
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{
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int result = -ENOMEM;
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struct usb_device *usb_dev = wusb_dev->usb_dev;
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struct device *dev = &usb_dev->dev;
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u8 new_address = wusb_dev->addr & 0x7F;
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/* Set address 0 */
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result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
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USB_REQ_SET_ADDRESS,
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USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
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0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
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if (result < 0) {
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dev_err(dev, "auth failed: can't set address 0: %d\n",
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result);
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goto error_addr0;
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}
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result = wusb_set_dev_addr(wusbhc, wusb_dev, 0);
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if (result < 0)
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goto error_addr0;
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usb_set_device_state(usb_dev, USB_STATE_DEFAULT);
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usb_ep0_reinit(usb_dev);
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/* Set new (authenticated) address. */
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result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
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USB_REQ_SET_ADDRESS,
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USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
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new_address, 0, NULL, 0,
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USB_CTRL_SET_TIMEOUT);
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if (result < 0) {
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dev_err(dev, "auth failed: can't set address %u: %d\n",
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new_address, result);
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goto error_addr;
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}
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result = wusb_set_dev_addr(wusbhc, wusb_dev, new_address);
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if (result < 0)
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goto error_addr;
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usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
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usb_ep0_reinit(usb_dev);
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usb_dev->authenticated = 1;
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error_addr:
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error_addr0:
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return result;
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}
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/*
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*
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*
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*/
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/* FIXME: split and cleanup */
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int wusb_dev_4way_handshake(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev,
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struct wusb_ckhdid *ck)
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{
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int result = -ENOMEM;
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struct usb_device *usb_dev = wusb_dev->usb_dev;
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struct device *dev = &usb_dev->dev;
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u32 tkid;
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struct usb_handshake *hs;
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struct aes_ccm_nonce ccm_n;
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u8 mic[8];
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struct wusb_keydvt_in keydvt_in;
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struct wusb_keydvt_out keydvt_out;
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hs = kcalloc(3, sizeof(hs[0]), GFP_KERNEL);
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if (!hs)
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goto error_kzalloc;
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/* We need to turn encryption before beginning the 4way
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* hshake (WUSB1.0[.3.2.2]) */
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result = wusb_dev_set_encryption(usb_dev, 1);
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if (result < 0)
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goto error_dev_set_encryption;
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tkid = wusbhc_next_tkid(wusbhc, wusb_dev);
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hs[0].bMessageNumber = 1;
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hs[0].bStatus = 0;
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put_unaligned_le32(tkid, hs[0].tTKID);
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hs[0].bReserved = 0;
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memcpy(hs[0].CDID, &wusb_dev->cdid, sizeof(hs[0].CDID));
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get_random_bytes(&hs[0].nonce, sizeof(hs[0].nonce));
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memset(hs[0].MIC, 0, sizeof(hs[0].MIC)); /* Per WUSB1.0[T7-22] */
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result = usb_control_msg(
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usb_dev, usb_sndctrlpipe(usb_dev, 0),
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USB_REQ_SET_HANDSHAKE,
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USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
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1, 0, &hs[0], sizeof(hs[0]), USB_CTRL_SET_TIMEOUT);
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if (result < 0) {
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dev_err(dev, "Handshake1: request failed: %d\n", result);
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goto error_hs1;
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}
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/* Handshake 2, from the device -- need to verify fields */
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result = usb_control_msg(
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usb_dev, usb_rcvctrlpipe(usb_dev, 0),
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USB_REQ_GET_HANDSHAKE,
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USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
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2, 0, &hs[1], sizeof(hs[1]), USB_CTRL_GET_TIMEOUT);
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if (result < 0) {
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dev_err(dev, "Handshake2: request failed: %d\n", result);
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goto error_hs2;
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}
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result = -EINVAL;
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if (hs[1].bMessageNumber != 2) {
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dev_err(dev, "Handshake2 failed: bad message number %u\n",
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hs[1].bMessageNumber);
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goto error_hs2;
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}
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if (hs[1].bStatus != 0) {
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dev_err(dev, "Handshake2 failed: bad status %u\n",
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hs[1].bStatus);
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goto error_hs2;
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}
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if (memcmp(hs[0].tTKID, hs[1].tTKID, sizeof(hs[0].tTKID))) {
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dev_err(dev, "Handshake2 failed: TKID mismatch "
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"(#1 0x%02x%02x%02x vs #2 0x%02x%02x%02x)\n",
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hs[0].tTKID[0], hs[0].tTKID[1], hs[0].tTKID[2],
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hs[1].tTKID[0], hs[1].tTKID[1], hs[1].tTKID[2]);
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goto error_hs2;
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}
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if (memcmp(hs[0].CDID, hs[1].CDID, sizeof(hs[0].CDID))) {
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dev_err(dev, "Handshake2 failed: CDID mismatch\n");
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goto error_hs2;
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}
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/* Setup the CCM nonce */
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memset(&ccm_n.sfn, 0, sizeof(ccm_n.sfn)); /* Per WUSB1.0[6.5.2] */
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put_unaligned_le32(tkid, ccm_n.tkid);
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ccm_n.src_addr = wusbhc->uwb_rc->uwb_dev.dev_addr;
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ccm_n.dest_addr.data[0] = wusb_dev->addr;
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ccm_n.dest_addr.data[1] = 0;
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/* Derive the KCK and PTK from CK, the CCM, H and D nonces */
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memcpy(keydvt_in.hnonce, hs[0].nonce, sizeof(keydvt_in.hnonce));
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memcpy(keydvt_in.dnonce, hs[1].nonce, sizeof(keydvt_in.dnonce));
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result = wusb_key_derive(&keydvt_out, ck->data, &ccm_n, &keydvt_in);
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if (result < 0) {
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dev_err(dev, "Handshake2 failed: cannot derive keys: %d\n",
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result);
|
|
goto error_hs2;
|
|
}
|
|
|
|
/* Compute MIC and verify it */
|
|
result = wusb_oob_mic(mic, keydvt_out.kck, &ccm_n, &hs[1]);
|
|
if (result < 0) {
|
|
dev_err(dev, "Handshake2 failed: cannot compute MIC: %d\n",
|
|
result);
|
|
goto error_hs2;
|
|
}
|
|
|
|
if (memcmp(hs[1].MIC, mic, sizeof(hs[1].MIC))) {
|
|
dev_err(dev, "Handshake2 failed: MIC mismatch\n");
|
|
goto error_hs2;
|
|
}
|
|
|
|
/* Send Handshake3 */
|
|
hs[2].bMessageNumber = 3;
|
|
hs[2].bStatus = 0;
|
|
put_unaligned_le32(tkid, hs[2].tTKID);
|
|
hs[2].bReserved = 0;
|
|
memcpy(hs[2].CDID, &wusb_dev->cdid, sizeof(hs[2].CDID));
|
|
memcpy(hs[2].nonce, hs[0].nonce, sizeof(hs[2].nonce));
|
|
result = wusb_oob_mic(hs[2].MIC, keydvt_out.kck, &ccm_n, &hs[2]);
|
|
if (result < 0) {
|
|
dev_err(dev, "Handshake3 failed: cannot compute MIC: %d\n",
|
|
result);
|
|
goto error_hs2;
|
|
}
|
|
|
|
result = usb_control_msg(
|
|
usb_dev, usb_sndctrlpipe(usb_dev, 0),
|
|
USB_REQ_SET_HANDSHAKE,
|
|
USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
|
|
3, 0, &hs[2], sizeof(hs[2]), USB_CTRL_SET_TIMEOUT);
|
|
if (result < 0) {
|
|
dev_err(dev, "Handshake3: request failed: %d\n", result);
|
|
goto error_hs3;
|
|
}
|
|
|
|
result = wusbhc->set_ptk(wusbhc, wusb_dev->port_idx, tkid,
|
|
keydvt_out.ptk, sizeof(keydvt_out.ptk));
|
|
if (result < 0)
|
|
goto error_wusbhc_set_ptk;
|
|
|
|
result = wusb_dev_set_gtk(wusbhc, wusb_dev);
|
|
if (result < 0) {
|
|
dev_err(dev, "Set GTK for device: request failed: %d\n",
|
|
result);
|
|
goto error_wusbhc_set_gtk;
|
|
}
|
|
|
|
/* Update the device's address from unauth to auth */
|
|
if (usb_dev->authenticated == 0) {
|
|
result = wusb_dev_update_address(wusbhc, wusb_dev);
|
|
if (result < 0)
|
|
goto error_dev_update_address;
|
|
}
|
|
result = 0;
|
|
dev_info(dev, "device authenticated\n");
|
|
|
|
error_dev_update_address:
|
|
error_wusbhc_set_gtk:
|
|
error_wusbhc_set_ptk:
|
|
error_hs3:
|
|
error_hs2:
|
|
error_hs1:
|
|
memset(hs, 0, 3*sizeof(hs[0]));
|
|
memzero_explicit(&keydvt_out, sizeof(keydvt_out));
|
|
memzero_explicit(&keydvt_in, sizeof(keydvt_in));
|
|
memzero_explicit(&ccm_n, sizeof(ccm_n));
|
|
memzero_explicit(mic, sizeof(mic));
|
|
if (result < 0)
|
|
wusb_dev_set_encryption(usb_dev, 0);
|
|
error_dev_set_encryption:
|
|
kfree(hs);
|
|
error_kzalloc:
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Once all connected and authenticated devices have received the new
|
|
* GTK, switch the host to using it.
|
|
*/
|
|
static void wusbhc_gtk_rekey_work(struct work_struct *work)
|
|
{
|
|
struct wusbhc *wusbhc = container_of(work,
|
|
struct wusbhc, gtk_rekey_work);
|
|
size_t key_size = sizeof(wusbhc->gtk.data);
|
|
int port_idx;
|
|
struct wusb_dev *wusb_dev, *wusb_dev_next;
|
|
LIST_HEAD(rekey_list);
|
|
|
|
mutex_lock(&wusbhc->mutex);
|
|
/* generate the new key */
|
|
wusbhc_generate_gtk(wusbhc);
|
|
/* roll the gtk index. */
|
|
wusbhc->gtk_index = (wusbhc->gtk_index + 1) % (WUSB_KEY_INDEX_MAX + 1);
|
|
/*
|
|
* Save all connected devices on a list while holding wusbhc->mutex and
|
|
* take a reference to each one. Then submit the set key request to
|
|
* them after releasing the lock in order to avoid a deadlock.
|
|
*/
|
|
for (port_idx = 0; port_idx < wusbhc->ports_max; port_idx++) {
|
|
wusb_dev = wusbhc->port[port_idx].wusb_dev;
|
|
if (!wusb_dev || !wusb_dev->usb_dev
|
|
|| !wusb_dev->usb_dev->authenticated)
|
|
continue;
|
|
|
|
wusb_dev_get(wusb_dev);
|
|
list_add_tail(&wusb_dev->rekey_node, &rekey_list);
|
|
}
|
|
mutex_unlock(&wusbhc->mutex);
|
|
|
|
/* Submit the rekey requests without holding wusbhc->mutex. */
|
|
list_for_each_entry_safe(wusb_dev, wusb_dev_next, &rekey_list,
|
|
rekey_node) {
|
|
list_del_init(&wusb_dev->rekey_node);
|
|
dev_dbg(&wusb_dev->usb_dev->dev,
|
|
"%s: rekey device at port %d\n",
|
|
__func__, wusb_dev->port_idx);
|
|
|
|
if (wusb_dev_set_gtk(wusbhc, wusb_dev) < 0) {
|
|
dev_err(&wusb_dev->usb_dev->dev,
|
|
"%s: rekey device at port %d failed\n",
|
|
__func__, wusb_dev->port_idx);
|
|
}
|
|
wusb_dev_put(wusb_dev);
|
|
}
|
|
|
|
/* Switch the host controller to use the new GTK. */
|
|
mutex_lock(&wusbhc->mutex);
|
|
wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid,
|
|
&wusbhc->gtk.descr.bKeyData, key_size);
|
|
mutex_unlock(&wusbhc->mutex);
|
|
}
|
|
|
|
/**
|
|
* wusbhc_gtk_rekey - generate and distribute a new GTK
|
|
* @wusbhc: the WUSB host controller
|
|
*
|
|
* Generate a new GTK and distribute it to all connected and
|
|
* authenticated devices. When all devices have the new GTK, the host
|
|
* starts using it.
|
|
*
|
|
* This must be called after every device disconnect (see [WUSB]
|
|
* section 6.2.11.2).
|
|
*/
|
|
void wusbhc_gtk_rekey(struct wusbhc *wusbhc)
|
|
{
|
|
/*
|
|
* We need to submit a URB to the downstream WUSB devices in order to
|
|
* change the group key. This can't be done while holding the
|
|
* wusbhc->mutex since that is also taken in the urb_enqueue routine
|
|
* and will cause a deadlock. Instead, queue a work item to do
|
|
* it when the lock is not held
|
|
*/
|
|
queue_work(wusbhc->wq_security, &wusbhc->gtk_rekey_work);
|
|
}
|