willem/ft_otp
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Improve error handling and user feedback in OTP key generation and reading functions

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This commit is contained in:
whaffman 2025-07-03 20:05:20 +02:00
parent 5ce8ac58c5
commit 3d17016823
1 changed files with 29 additions and 10 deletions
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39
ft_otp.py
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@ -26,7 +26,6 @@ def main():
elif args.q:
# Call the function to generate a QR code for the OTP key
generate_qr_code()
print("QR code generated successfully.")
else:
print("No action specified. Use -g to generate a new OTP key or -k to generate a OTP from a key file.")
parser.print_help()
@ -41,8 +40,15 @@ def is_hex(s):
def generate_secret_key(secret_file):
print(f"Generating OTP key from {secret_file}...")
machine_id = get_machine_hash()
with open(secret_file, 'rb') as f:
secret = f.read().strip()
try:
with open(secret_file, 'r') as f:
secret = f.read().strip()
except FileNotFoundError:
print(f"Secret file {secret_file} not found. Please provide a valid file.")
return
if not secret:
print("The provided secret file is empty. Please provide a valid secret.")
return
if not is_hex(secret.decode()):
print("The provided secret is not a valid hexadecimal string.")
return
@ -51,14 +57,29 @@ def generate_secret_key(secret_file):
return
fernet = Fernet(machine_id)
secret_enc = fernet.encrypt(secret)
with open('./ft_otp.key', 'wb') as f:
f.write(secret_enc)
try:
with open('./ft_otp.key', 'wb') as f:
f.write(secret_enc)
print("OTP key generated and saved to ft_otp.key")
except IOError as e:
print(f"Error writing to file: {e}")
return
def read_secret_key(keyfile):
"""Read the secret key from the specified file."""
machine_id = get_machine_hash()
with open(keyfile, 'rb') as f:
secret_enc = f.read().strip()
if machine_id is None:
print("Machine ID could not be retrieved. Exiting.")
return None
try:
with open(keyfile, 'rb') as f:
secret_enc = f.read().strip()
except FileNotFoundError:
print(f"Key file {keyfile} not found. Please provide a valid file.")
return None
if not secret_enc:
print("The provided key file is empty. Please provide a valid key file.")
return None
fernet = Fernet(machine_id)
secret = fernet.decrypt(secret_enc)
return secret
@ -67,10 +88,8 @@ def generate_qr_code():
"""Generate a QR code for the OTP key."""
keyfile = './ft_otp.key'
secret = read_secret_key(keyfile)
print(f"Secret key read from {keyfile}: {secret.decode()}")
base32 = base64.b32encode(base64.b16decode(secret.upper())).decode().strip('=')
print(str(base32))
otp_uri = f"otpauth://totp/FTOTP?secret={base32}&issuer=FTOTP&algo=SHA1&digits=6&period=30"
otp_uri = f"otpauth://totp/FTOTP?secret={base32}&issuer=whaffman&algo=SHA1&digits=6&period=30"
qrcode_terminal.draw(otp_uri)
def generate_otp_from_secret_key(keyfile):