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#!/usr/bin/env python3
"""Interactive verifier for suspicious terminal key captures.
Self-contained Python 3 script.
Prompts a short list of suspicious keys, captures each multiple times,
and writes a TSV file for easy comparison.
Usage:
python3 verify_suspicious_keys.py
"""
from __future__ import annotations
import re
import select
import sys
import termios
import time
import tty
from pathlib import Path
IDLE_TIMEOUT_S = 0.025
ABORT_CAPTURE = b"\x07" # Ctrl+G
REPETITIONS = 2
SUSPICIOUS_KEYS: list[tuple[str, str]] = [
("home", "Press Home"),
("end", "Press End"),
("pageup", "Press Page Up"),
("pagedown", "Press Page Down"),
("shift+enter", "Press Shift+Enter"),
("alt+left", "Press Alt+Left Arrow"),
("alt+right", "Press Alt+Right Arrow"),
]
def to_hex(data: bytes) -> str:
return data.hex()
def escaped(data: bytes) -> str:
parts: list[str] = []
for byte in data:
if byte == 0x1B:
parts.append("\\x1b")
elif byte == 0x7F:
parts.append("\\x7f")
elif byte == 0x0D:
parts.append("\\r")
elif byte == 0x0A:
parts.append("\\n")
elif byte == 0x09:
parts.append("\\t")
elif 0x20 <= byte <= 0x7E:
parts.append(chr(byte))
else:
parts.append(f"\\x{byte:02x}")
return "".join(parts)
def sanitize(value: str) -> str:
value = value.strip().lower()
value = re.sub(r"[^a-z0-9._-]+", "-", value)
value = re.sub(r"-+", "-", value).strip("-._")
return value or "terminal"
def read_sequence() -> bytes:
first = sys.stdin.buffer.read1(1)
if not first:
return b""
chunks = [first]
while True:
ready, _, _ = select.select([sys.stdin], [], [], IDLE_TIMEOUT_S)
if not ready:
break
chunk = sys.stdin.buffer.read1(1024)
if not chunk:
break
chunks.append(chunk)
return b"".join(chunks)
class RawMode:
def __enter__(self) -> "RawMode":
self.fd = sys.stdin.fileno()
self.old = termios.tcgetattr(self.fd)
tty.setraw(self.fd)
return self
def __exit__(self, exc_type, exc, tb) -> None:
termios.tcsetattr(self.fd, termios.TCSADRAIN, self.old)
def prompt(text: str, default: str | None = None) -> str:
suffix = f" [{default}]" if default else ""
value = input(f"{text}{suffix}: ").strip()
if not value and default is not None:
return default
return value
def choose_output_path(terminal_name: str) -> Path:
stamp = time.strftime("%Y%m%d-%H%M%S")
default_name = f"key-verify-{sanitize(terminal_name)}-{stamp}.tsv"
raw = prompt("Output file path", default_name)
return Path(raw).expanduser().resolve()
def capture_one(display: str, repetition: int) -> bytes | None:
print()
print(f"=== {display} (capture {repetition}/{REPETITIONS}) ===")
print("Press the key now. Ctrl+G aborts the session.")
sys.stdout.flush()
with RawMode():
data = read_sequence()
if data == ABORT_CAPTURE:
return None
return data
def confirm_capture(data: bytes) -> str:
print(f"Captured: hex={to_hex(data)} escaped={escaped(data)!r}")
while True:
choice = input("Enter=accept, r=retry, s=skip, q=quit: ").strip().lower()
if choice in {"", "r", "s", "q"}:
return choice
print("Please enter one of: Enter, r, s, q")
def write_tsv(path: Path, rows: list[dict[str, str]]) -> None:
path.parent.mkdir(parents=True, exist_ok=True)
with path.open("w", encoding="utf-8", newline="") as f:
f.write("terminal\tkey\trepetition\tnotes\tbytes_hex\tescaped\n")
for row in rows:
f.write(
"\t".join(
[
row["terminal"],
row["key"],
row["repetition"],
row["notes"],
row["bytes_hex"],
row["escaped"],
]
)
+ "\n"
)
def main() -> int:
print("Suspicious terminal key verifier")
print("This captures a short list of keys multiple times for consistency checking.")
print()
terminal_name = prompt("Terminal name")
if not terminal_name:
print("Terminal name is required.", file=sys.stderr)
return 1
notes = prompt("Optional notes", "")
output_path = choose_output_path(terminal_name)
print()
print(f"Terminal: {terminal_name}")
print(f"Notes: {notes or '-'}")
print(f"Output: {output_path}")
print()
input("Press Enter to start verifier...")
rows: list[dict[str, str]] = []
for key_id, display in SUSPICIOUS_KEYS:
for repetition in range(1, REPETITIONS + 1):
while True:
data = capture_one(display, repetition)
if data is None:
print("Aborted by Ctrl+G.")
write_tsv(output_path, rows)
print(f"Wrote partial capture to {output_path}")
return 1
choice = confirm_capture(data)
if choice == "r":
continue
if choice == "s":
rows.append(
{
"terminal": terminal_name,
"key": key_id,
"repetition": str(repetition),
"notes": notes,
"bytes_hex": "",
"escaped": "SKIPPED",
}
)
break
if choice == "q":
write_tsv(output_path, rows)
print(f"Wrote partial capture to {output_path}")
return 0
rows.append(
{
"terminal": terminal_name,
"key": key_id,
"repetition": str(repetition),
"notes": notes,
"bytes_hex": to_hex(data),
"escaped": escaped(data),
}
)
break
write_tsv(output_path, rows)
print()
print(f"Done. Wrote {len(rows)} rows to {output_path}")
return 0
if __name__ == "__main__":
raise SystemExit(main())
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