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BadUSB: add SYSRQ keys (#1460)

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This allows sending of SysRq keys[1]. This then for example allows
sending the well known 'reisub' commands to safely reboot a otherwise
frozen Linux box. Or obviously any of the other magic keys.

The advantage compared to sending it to /proc/sysrq-trigger is that one
does not need a shell and depending on how broken the system is, one
might not even be able to get a new shell. The SysRq keys still work.

The cost is adding a new/"non-standard" keyword, IMO it is worth it.

Example:
DEFAULTDELAY 200
DELAY 1000
SYSRQ r
SYSRQ e
SYSRQ i
SYSRQ s
SYSRQ u
SYSRQ b

If one really wants to test it, I suggest h(elp) or w(ait).

[1] https://en.wikipedia.org/wiki/Magic_SysRq_key

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
This commit is contained in:
Roland Kammerer 2022-10-08 19:56:56 +02:00 committed by GitHub
parent 31c0346adc
commit a1ede0a2fc
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1 changed files with 9 additions and 0 deletions
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9
applications/main/bad_usb/bad_usb_script.c
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@ -109,6 +109,7 @@ static const char ducky_cmd_string[] = {"STRING "};
static const char ducky_cmd_defdelay_1[] = {"DEFAULT_DELAY "};
static const char ducky_cmd_defdelay_2[] = {"DEFAULTDELAY "};
static const char ducky_cmd_repeat[] = {"REPEAT "};
static const char ducky_cmd_sysrq[] = {"SYSRQ "};
static const char ducky_cmd_altchar[] = {"ALTCHAR "};
static const char ducky_cmd_altstr_1[] = {"ALTSTRING "};
@ -292,6 +293,14 @@ static int32_t ducky_parse_line(BadUsbScript* bad_usb, FuriString* line) {
line_tmp = &line_tmp[ducky_get_command_len(line_tmp) + 1];
state = ducky_get_number(line_tmp, &bad_usb->repeat_cnt);
return (state) ? (0) : SCRIPT_STATE_ERROR;
} else if(strncmp(line_tmp, ducky_cmd_sysrq, strlen(ducky_cmd_sysrq)) == 0) {
// SYSRQ
line_tmp = &line_tmp[ducky_get_command_len(line_tmp) + 1];
uint16_t key = ducky_get_keycode(line_tmp, true);
furi_hal_hid_kb_press(KEY_MOD_LEFT_ALT | HID_KEYBOARD_PRINT_SCREEN);
furi_hal_hid_kb_press(key);
furi_hal_hid_kb_release_all();
return (0);
} else {
// Special keys + modifiers
uint16_t key = ducky_get_keycode(line_tmp, false);