flash code, and testing.USG_0.9
Robert Fisk
7 years ago
parent
ed130705c1
commit
7a70c5826b
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/*
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* upstream_hid_botdetect.h
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*
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* Created on: Aug 17, 2017
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* Author: Robert Fisk
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*/
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#ifndef INC_UPSTREAM_HID_BOTDETECT_H_
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#define INC_UPSTREAM_HID_BOTDETECT_H_
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#include "stm32f4xx_hal.h"
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#define KEY_ROLLOVER 0x01 //Rollover means we hold the last reported key status
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#define KEY_A 0x04
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#define KEY_Z 0x1D
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#define KEY_1 0x1E
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#define KEY_0 0x27
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#define KEY_SPACE 0x2C
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#define KEY_PAD_1 0x59
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#define KEY_PAD_0 0x62
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#define KEY_MODIFIER_BASE 0xE0 //First modifier key is L-Ctl
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typedef enum
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{
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LOCKOUT_STATE_INACTIVE = 0,
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LOCKOUT_STATE_ACTIVE,
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LOCKOUT_STATE_FLASHING
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}
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LockoutStateTypeDef;
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typedef struct
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{
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uint8_t KeyCode;
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uint32_t KeyDownTime;
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int32_t KeyActiveTimer;
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}
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KeyTimerLogTypeDef;
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void Upstream_HID_BotDetect_Systick(void);
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void Upstream_HID_BotDetectKeyboard(uint8_t* keyboardInData);
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#endif /* INC_UPSTREAM_HID_BOTDETECT_H_ */
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/*
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* upstream_hid_botdetect.c
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*
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* Created on: Aug 17, 2017
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* Author: Robert Fisk
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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#include "upstream_hid_botdetect.h"
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#include "upstream_hid.h"
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#include "build_config.h"
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//Variables common between keyboard and mouse bot detection:
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uint32_t TemporaryLockoutStartTime;
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LockoutStateTypeDef PermanentLockoutState = LOCKOUT_STATE_INACTIVE;
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volatile LockoutStateTypeDef TemporaryLockoutState = LOCKOUT_STATE_INACTIVE;
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//Variables specific to keyboard bot detection:
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#if defined (CONFIG_KEYBOARD_ENABLED) && defined (CONFIG_KEYBOARD_BOT_DETECT_ENABLED)
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KeyTimerLogTypeDef KeyTimerLog[KEYBOARD_BOTDETECT_PERMANENT_LOCKOUT_KEY_COUNT];
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volatile uint8_t KeyTimerCount = 0;
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uint8_t LastKeyCode = 0;
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uint8_t ShortKeypressCount = 0;
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uint8_t OldKeyboardInData[HID_KEYBOARD_INPUT_DATA_LEN] = {0};
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#endif
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//Variables specific to mouse bot detection:
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#if defined (CONFIG_MOUSE_ENABLED) && defined (CONFIG_MOUSE_BOT_DETECT_ENABLED)
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#endif
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//Code specific to keyboard bot detection:
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#if defined (CONFIG_KEYBOARD_ENABLED) && defined (CONFIG_KEYBOARD_BOT_DETECT_ENABLED)
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static uint32_t Upstream_HID_BotDetectKeyboard_RolloverCheck(uint8_t* keyboardInData);
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static uint32_t Upstream_HID_BotDetectKeyboard_KeyIsAlphanum(uint8_t keyCode);
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static void Upstream_HID_BotDetectKeyboard_KeyDown(uint8_t keyCode);
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static void Upstream_HID_BotDetectKeyboard_KeyUp(uint8_t keyCode);
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//Checks if received keyboard data is from a real human.
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//This is not entirely bulletproof as an attacking device may slow its keypresses below the threshold.
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void Upstream_HID_BotDetectKeyboard(uint8_t* keyboardInData)
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{
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uint32_t i;
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uint32_t j;
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uint8_t tempByte;
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if (Upstream_HID_BotDetectKeyboard_RolloverCheck(keyboardInData)) return;
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//Process modifier keys in first byte
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tempByte = keyboardInData[0];
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for (i = 0; i < 8; i++)
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{
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if ((tempByte & 1) && !(OldKeyboardInData[0] & 1))
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{
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Upstream_HID_BotDetectKeyboard_KeyDown(KEY_MODIFIER_BASE + i);
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}
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if (!(tempByte & 1) && (OldKeyboardInData[0] & 1))
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{
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Upstream_HID_BotDetectKeyboard_KeyDown(KEY_MODIFIER_BASE + i);
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}
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tempByte >>= 1;
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OldKeyboardInData[0] >>= 1;
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}
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//Process key array: search for keydowns
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for (i = 2; i < HID_KEYBOARD_INPUT_DATA_LEN; i++)
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{
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if (keyboardInData[i] >= KEY_A)
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{
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for (j = 2; j < HID_KEYBOARD_INPUT_DATA_LEN; j++)
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{
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if (keyboardInData[i] == OldKeyboardInData[j]) break;
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}
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if (j >= HID_KEYBOARD_INPUT_DATA_LEN)
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{
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Upstream_HID_BotDetectKeyboard_KeyDown(keyboardInData[i]);
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}
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}
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}
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//Process key array: search for keyups
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for (i = 2; i < HID_KEYBOARD_INPUT_DATA_LEN; i++)
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{
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if (OldKeyboardInData[i] >= KEY_A)
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{
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for (j = 2; j < HID_KEYBOARD_INPUT_DATA_LEN; j++)
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{
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if (keyboardInData[i] == OldKeyboardInData[j]) break;
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}
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if (j >= HID_KEYBOARD_INPUT_DATA_LEN)
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{
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Upstream_HID_BotDetectKeyboard_KeyUp(OldKeyboardInData[i]);
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}
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}
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}
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//Copy new data to old array
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for (i = 0; i < HID_KEYBOARD_INPUT_DATA_LEN; i++)
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{
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OldKeyboardInData[i] = keyboardInData[i];
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}
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//Final checks
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if (KeyTimerCount >= KEYBOARD_BOTDETECT_TEMPORARY_LOCKOUT_KEY_COUNT)
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{
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TemporaryLockoutStartTime = HAL_GetTick();
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TemporaryLockoutState = LOCKOUT_STATE_ACTIVE;
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////////////Set LED state
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}
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//Host receives no data if we are locked
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if ((TemporaryLockoutState == LOCKOUT_STATE_ACTIVE) || (PermanentLockoutState == LOCKOUT_STATE_ACTIVE))
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{
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for (i = 0; i < HID_KEYBOARD_INPUT_DATA_LEN; i++)
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{
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keyboardInData[i] = 0;
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}
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}
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}
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//Keyboard reports a rollover code when there are too many keys to scan/report.
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static uint32_t Upstream_HID_BotDetectKeyboard_RolloverCheck(uint8_t* keyboardInData)
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{
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uint32_t i;
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for (i = 2; i < HID_KEYBOARD_INPUT_DATA_LEN; i++)
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{
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if (keyboardInData[i] == KEY_ROLLOVER) break;
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}
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if (i >= HID_KEYBOARD_INPUT_DATA_LEN) return 0;
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//As I am unclear on the exact usage and interpretation of the rollover code,
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//we are going to play it safe by copying the old keyboard data over the new array.
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//This ensures the host interprets a rollover event exactly the way we do!
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//Host receives no data if we are locked
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if ((TemporaryLockoutState == LOCKOUT_STATE_ACTIVE) || (PermanentLockoutState == LOCKOUT_STATE_ACTIVE))
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{
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for (i = 0; i < HID_KEYBOARD_INPUT_DATA_LEN; i++)
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{
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keyboardInData[i] = 0;
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}
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}
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else
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{
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for (i = 0; i < HID_KEYBOARD_INPUT_DATA_LEN; i++)
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{
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keyboardInData[i] = OldKeyboardInData[i];
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}
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}
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return 1;
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}
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static void Upstream_HID_BotDetectKeyboard_KeyDown(uint8_t keyCode)
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{
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uint32_t tempKeyActiveTime;
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if (KeyTimerCount >= KEYBOARD_BOTDETECT_PERMANENT_LOCKOUT_KEY_COUNT)
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{
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PermanentLockoutState = LOCKOUT_STATE_ACTIVE;
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////////////Set LED state
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return;
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}
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if (Upstream_HID_BotDetectKeyboard_KeyIsAlphanum(keyCode))
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{
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tempKeyActiveTime = KEYBOARD_BOTDETECT_ALPHANUM_TIME_MS;
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}
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else
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{
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if (keyCode == LastKeyCode)
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{
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tempKeyActiveTime = KEYBOARD_BOTDETECT_NON_ALPHANUM_REPEATED_TIME_MS;
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}
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else
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{
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tempKeyActiveTime = KEYBOARD_BOTDETECT_NON_ALPHANUM_DIFFERENT_TIME_MS;
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}
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}
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LastKeyCode = keyCode;
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//Disable systick interrupt while adding key to array
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__disable_irq();
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KeyTimerLog[KeyTimerCount].KeyCode = keyCode;
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KeyTimerLog[KeyTimerCount].KeyDownTime = HAL_GetTick();
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KeyTimerLog[KeyTimerCount++].KeyActiveTimer = tempKeyActiveTime;
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__enable_irq();
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}
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static uint32_t Upstream_HID_BotDetectKeyboard_KeyIsAlphanum(uint8_t keyCode)
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{
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if ((keyCode >= KEY_A) && (keyCode <= KEY_Z)) return 1;
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if ((keyCode >= KEY_1) && (keyCode <= KEY_0)) return 1;
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if ((keyCode >= KEY_PAD_1) && (keyCode <= KEY_PAD_0)) return 1;
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if (keyCode == KEY_SPACE) return 1;
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//else:
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return 0;
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}
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static void Upstream_HID_BotDetectKeyboard_KeyUp(uint8_t keyCode)
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{
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uint32_t i;
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//Search through active key array to see if this key was pressed recently
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__disable_irq();
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for (i = 0; i < KeyTimerCount; i++)
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{
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if (KeyTimerLog[i].KeyCode == keyCode) break;
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}
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if (i >= KeyTimerCount)
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{
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__enable_irq();
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return;
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}
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//Was this is a short keypress?
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if ((int32_t)(HAL_GetTick() - KeyTimerLog[i].KeyDownTime) < KEYBOARD_BOTDETECT_MINIMUM_KEYDOWN_TIME_MS)
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{
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ShortKeypressCount++;
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////////////Set LED state
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if (ShortKeypressCount >= KEYBOARD_BOTDETECT_PERMANENT_LOCKOUT_SHORT_COUNT)
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{
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PermanentLockoutState = LOCKOUT_STATE_ACTIVE;
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}
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else
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{
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TemporaryLockoutStartTime = HAL_GetTick();
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TemporaryLockoutState = LOCKOUT_STATE_ACTIVE;
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}
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}
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__enable_irq();
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}
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#endif //if defined (CONFIG_KEYBOARD_ENABLED) && defined (CONFIG_KEYBOARD_BOT_DETECT_ENABLED)
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//Called by Systick_Handler every 1ms, at high interrupt priority.
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void Upstream_HID_BotDetect_Systick(void)
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{
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uint32_t i;
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//Keyboard-specific stuff:
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#if defined (CONFIG_KEYBOARD_ENABLED) && defined (CONFIG_KEYBOARD_BOT_DETECT_ENABLED)
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if (KeyTimerCount > 0) //Check if current active key has timed out
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{
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KeyTimerLog[0].KeyActiveTimer--;
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if (KeyTimerLog[0].KeyActiveTimer <= 0)
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{
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KeyTimerCount--;
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for (i = 0; i < KeyTimerCount; i++) //Shuffle other keys down
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{
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KeyTimerLog[i].KeyCode = KeyTimerLog[i + 1].KeyCode;
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KeyTimerLog[i].KeyDownTime = KeyTimerLog[i + 1].KeyDownTime;
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KeyTimerLog[i].KeyActiveTimer = KeyTimerLog[i + 1].KeyActiveTimer;
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}
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}
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}
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//Check if temporary lockout has expired
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if (TemporaryLockoutState == LOCKOUT_STATE_ACTIVE)
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{
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if ((int32_t)(HAL_GetTick() - TemporaryLockoutStartTime) > KEYBOARD_BOTDETECT_TEMPORARY_LOCKOUT_TIME_MS)
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{
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TemporaryLockoutState = LOCKOUT_STATE_FLASHING;
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}
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}
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else if (TemporaryLockoutState == LOCKOUT_STATE_FLASHING)
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{
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if ((int32_t)(HAL_GetTick() - TemporaryLockoutStartTime) > KEYBOARD_BOTDETECT_TEMPORARY_LOCKOUT_LED_TIME_MS)
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{
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////////////Set LEDs off
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TemporaryLockoutState = LOCKOUT_STATE_INACTIVE;
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}
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}
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#endif
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#if defined (CONFIG_MOUSE_ENABLED) && defined (CONFIG_MOUSE_BOT_DETECT_ENABLED)
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#endif
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}
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