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badusb_dissector.lua
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badusb_dissector.lua
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-----------------------------------------------------------------------------
-- BadUSB Keyboard Dissector
-- https://github.com/agentzex/FlipperZero-BadUSB-Wireshark
-----------------------------------------------------------------------------
-- Modifier keys bitmask
MODIFIER_KEYS = {
{ value = 0x01, name = "[LEFT-CTRL]" },
{ value = 0x02, name = "[LEFT-SHIFT]" },
{ value = 0x04, name = "[LEFT-ALT]" },
{ value = 0x08, name = "[LEFT-GUI]" },
{ value = 0x10, name = "[RIGHT-CTRL]" },
{ value = 0x20, name = "[RIGHT-SHIFT]" },
{ value = 0x40, name = "[RIGHT-ALT]" },
{ value = 0x80, name = "[RIGHT-GUI]" }
}
KEY_MAP = {
[0x04] = { normal = "a", shifted = "A" },
[0x05] = { normal = "b", shifted = "B" },
[0x06] = { normal = "c", shifted = "C" },
[0x07] = { normal = "d", shifted = "D" },
[0x08] = { normal = "e", shifted = "E" },
[0x09] = { normal = "f", shifted = "F" },
[0x0A] = { normal = "g", shifted = "G" },
[0x0B] = { normal = "h", shifted = "H" },
[0x0C] = { normal = "i", shifted = "I" },
[0x0D] = { normal = "j", shifted = "J" },
[0x0E] = { normal = "k", shifted = "K" },
[0x0F] = { normal = "l", shifted = "L" },
[0x10] = { normal = "m", shifted = "M" },
[0x11] = { normal = "n", shifted = "N" },
[0x12] = { normal = "o", shifted = "O" },
[0x13] = { normal = "p", shifted = "P" },
[0x14] = { normal = "q", shifted = "Q" },
[0x15] = { normal = "r", shifted = "R" },
[0x16] = { normal = "s", shifted = "S" },
[0x17] = { normal = "t", shifted = "T" },
[0x18] = { normal = "u", shifted = "U" },
[0x19] = { normal = "v", shifted = "V" },
[0x1A] = { normal = "w", shifted = "W" },
[0x1B] = { normal = "x", shifted = "X" },
[0x1C] = { normal = "y", shifted = "Y" },
[0x1D] = { normal = "z", shifted = "Z" },
[0x1E] = { normal = "1", shifted = "!" },
[0x1F] = { normal = "2", shifted = "@" },
[0x20] = { normal = "3", shifted = "#" },
[0x21] = { normal = "4", shifted = "$" },
[0x22] = { normal = "5", shifted = "%" },
[0x23] = { normal = "6", shifted = "^" },
[0x24] = { normal = "7", shifted = "&" },
[0x25] = { normal = "8", shifted = "*" },
[0x26] = { normal = "9", shifted = "(" },
[0x27] = { normal = "0", shifted = ")" },
[0x28] = { normal = "[ENTER]", shifted = "[ENTER]" },
[0x29] = { normal = "[ESC]", shifted = "[ESC]" },
[0x2A] = { normal = "[BACKSPACE]", shifted = "[BACKSPACE]" },
[0x2B] = { normal = "[TAB]", shifted = "[TAB]" },
[0x2C] = { normal = "[SPACE]", shifted = "[SPACE]" },
[0x2D] = { normal = "-", shifted = "_" },
[0x2E] = { normal = "=", shifted = "+" },
[0x2F] = { normal = "[", shifted = "{" },
[0x30] = { normal = "]", shifted = "}" },
[0x31] = { normal = "\\", shifted = "|" },
[0x33] = { normal = ";", shifted = ":" },
[0x34] = { normal = "'", shifted = "\"" },
[0x35] = { normal = "`", shifted = "~" },
[0x36] = { normal = ",", shifted = "<" },
[0x37] = { normal = ".", shifted = ">" },
[0x38] = { normal = "/", shifted = "?" },
[0x39] = { normal = "[CAPS LOCK]", shifted = "[CAPS LOCK]" },
[0x3A] = { normal = "[F1]", shifted = "[F1]" },
[0x3B] = { normal = "[F2]", shifted = "[F2]" },
[0x3C] = { normal = "[F3]", shifted = "[F3]" },
[0x3D] = { normal = "[F4]", shifted = "[F4]" },
[0x3E] = { normal = "[F5]", shifted = "[F5]" },
[0x3F] = { normal = "[F6]", shifted = "[F6]" },
[0x40] = { normal = "[F7]", shifted = "[F7]" },
[0x41] = { normal = "[F8]", shifted = "[F8]" },
[0x42] = { normal = "[F9]", shifted = "[F9]" },
[0x43] = { normal = "[F10]", shifted = "[F10]" },
[0x44] = { normal = "[F11]", shifted = "[F11]" },
[0x45] = { normal = "[F12]", shifted = "[F12]" },
[0x46] = { normal = "[PRINT SCREEN]", shifted = "[PRINT SCREEN]" },
[0x47] = { normal = "[SCROLL LOCK]", shifted = "[SCROLL LOCK]" },
[0x48] = { normal = "[PAUSE]", shifted = "[PAUSE]" },
[0x49] = { normal = "[INSERT]", shifted = "[INSERT]" },
[0x4A] = { normal = "[HOME]", shifted = "[HOME]" },
[0x4B] = { normal = "[PAGE UP]", shifted = "[PAGE UP]" },
[0x4C] = { normal = "[DELETE]", shifted = "[DELETE]" },
[0x4D] = { normal = "[END]", shifted = "[END]" },
[0x4E] = { normal = "[PAGE DOWN]", shifted = "[PAGE DOWN]" },
[0x4F] = { normal = "[RIGHT ARROW]", shifted = "[RIGHT ARROW]" },
[0x50] = { normal = "[LEFT ARROW]", shifted = "[LEFT ARROW]" },
[0x51] = { normal = "[DOWN ARROW]", shifted = "[DOWN ARROW]" },
[0x52] = { normal = "[UP ARROW]", shifted = "[UP ARROW]" },
[0x53] = { normal = "[NUM LOCK]", shifted = "[NUM LOCK]" },
[0x54] = { normal = "/", shifted = "/" },
[0x55] = { normal = "*", shifted = "*" },
[0x56] = { normal = "-", shifted = "-" },
[0x57] = { normal = "+", shifted = "+" },
[0x58] = { normal = "[ENTER]", shifted = "[ENTER]" },
[0x59] = { normal = "1", shifted = "[END]" },
[0x5A] = { normal = "2", shifted = "[DOWN ARROW]" },
[0x5B] = { normal = "3", shifted = "[PAGE DOWN]" },
[0x5C] = { normal = "4", shifted = "[LEFT ARROW]" },
[0x5D] = { normal = "5", shifted = "5" },
[0x5E] = { normal = "6", shifted = "[RIGHT ARROW]" },
[0x5F] = { normal = "7", shifted = "[HOME]" },
[0x60] = { normal = "8", shifted = "[UP ARROW]" },
[0x61] = { normal = "9", shifted = "[PAGE UP]" },
[0x62] = { normal = "0", shifted = "[INSERT]" },
[0x63] = { normal = ".", shifted = "[DELETE]" },
[0x65] = { normal = "[APPLICATION]", shifted = "[APPLICATION]" },
[0x66] = { normal = "[POWER]", shifted = "[POWER]" },
[0x67] = { normal = "=", shifted = "=" },
[0x68] = { normal = "[F13]", shifted = "[F13]" },
[0x69] = { normal = "[F14]", shifted = "[F14]" },
[0x6A] = { normal = "[F15]", shifted = "[F15]" },
[0x6B] = { normal = "[F16]", shifted = "[F16]" },
[0x6C] = { normal = "[F17]", shifted = "[F17]" },
[0x6D] = { normal = "[F18]", shifted = "[F18]" },
[0x6E] = { normal = "[F19]", shifted = "[F19]" },
[0x6F] = { normal = "[F20]", shifted = "[F20]" },
[0x70] = { normal = "[F21]", shifted = "[F21]" },
[0x71] = { normal = "[F22]", shifted = "[F22]" },
[0x72] = { normal = "[F23]", shifted = "[F23]" },
[0x73] = { normal = "[F24]", shifted = "[F24]" },
[0x7F] = { normal = "[MUTE]", shifted = "[MUTE]" },
[0x80] = { normal = "[VOLUME UP]", shifted = "[VOLUME UP]" },
[0x81] = { normal = "[VOLUME DOWN]", shifted = "[VOLUME DOWN]" },
[0x85] = { normal = ",", shifted = "," },
[0x86] = { normal = "=", shifted = "=" }
}
HID = 0x03
KEYBOARD_MODIFIER_OFFSET = 0
KEYBOARD_KEY_OFFSET = 2
FLIPPER_MODIFIER_OFFSET = 1
FLIPPER_KEY_OFFSET = 3
usb_keyboard_protocol = Proto("usb_keyboard", "USB Keyboard")
keyboard_key_field = ProtoField.uint8("usb_keyboard.key", "Key")
keyboard_modifier_field = ProtoField.int8 ("usb_keyboard.modifier", "Modifier")
usb_keyboard_protocol.fields = { keyboard_key_field, keyboard_modifier_field }
-- The modifier byte holds a bitmask of the modifier keys. This function extract them
function extract_modifier_keys(modifier_byte)
if modifier_byte == 0 then
return
end
local active_keys = {}
local shift_on = false
for _, key in ipairs(MODIFIER_KEYS) do
if bit.band(modifier_byte, key.value) ~= 0 then -- bitwise AND in Lua 5.2.4 which is the version in latest Wireshark
if key.value == 0x02 or key.value == 0x20 then
shift_on = true
end
table.insert(active_keys, key.name)
end
end
return shift_on, table.concat(active_keys, " ")
end
function parse_key(tvb, modifier_offset, key_offset)
local shift_on, modifiers_on = extract_modifier_keys(tvb(modifier_offset, 1):int())
local key_found = KEY_MAP[tvb(key_offset, 1):int()]
local key_value
if key_found ~= nil then
if shift_on then
key_value = key_found.shifted
else
key_value = key_found.normal
end
end
return key_value, modifiers_on
end
function parse_usb_keyboard(tvb, pinfo, tree)
if tvb:len() ~= 8 then -- USB keyboard HID payload size
return
end
local key_value, modifiers_on = parse_key(tvb, KEYBOARD_MODIFIER_OFFSET, KEYBOARD_KEY_OFFSET)
if key_value ~= nil or modifiers_on ~= nil then
pinfo.cols.protocol = "USB Keyboard"
end
return key_value, modifiers_on, KEYBOARD_KEY_OFFSET, KEYBOARD_MODIFIER_OFFSET
end
function parse_flipperzero_badusb_keyboard(tvb, pinfo, tree)
local flipper_indicator = tvb(0,1):int()
if flipper_indicator ~= 0x01 then
return
end
local key_value, modifiers_on = parse_key(tvb, FLIPPER_MODIFIER_OFFSET, FLIPPER_KEY_OFFSET)
if key_value ~= nil or modifiers_on ~= nil then
pinfo.cols.protocol = "Flipper Zero BadUSB"
end
return key_value, modifiers_on, FLIPPER_KEY_OFFSET, FLIPPER_MODIFIER_OFFSET
end
function parse_all(tvb, pinfo, tree)
local key_value, modifiers_on, key_offset, modifier_offset = parse_flipperzero_badusb_keyboard(tvb, pinfo, tree)
if key_value ~= nil or modifiers_on ~= nil then
return key_value, modifiers_on, key_offset, modifier_offset
end
-- default to normal usb keyboard/rubbery ducky
return parse_usb_keyboard(tvb, pinfo, tree)
end
function usb_keyboard_protocol.dissector(tvb, pinfo, tree)
if tvb:len() == 0 then
return
end
local key_value, modifiers_on, key_offset, modifier_offset = parse_all(tvb, pinfo, tree)
if key_value == nil and modifiers_on == nil then
return
end
pinfo.cols.info:append(" Key: ")
local subtree = tree:add(usb_keyboard_protocol, tvb(), "Keyboard")
-- Add keys to protocol column and dissection part
if modifiers_on ~= nil then
pinfo.cols.info:append(modifiers_on .. " ")
subtree:add(keyboard_modifier_field, tvb(modifier_offset, 1)):set_text("Modifier Keys: " .. modifiers_on)
end
if key_value ~= nil then
pinfo.cols.info:append(key_value)
subtree:add(keyboard_key_field, tvb(key_offset, 1)):set_text("Key: " .. key_value)
end
end
DissectorTable.get("usb.interrupt"):add(HID, usb_keyboard_protocol)