├── .gitignore ├── banktoken ├── __init__.py ├── tests │ ├── __init__.py │ ├── test_jscrypto.py │ └── test_banelcotoken.py ├── jscrypto.py └── banelcotoken.py ├── requirements.txt ├── activar.py ├── README.md └── LICENSE.txt /.gitignore: -------------------------------------------------------------------------------- 1 | *.pyc 2 | -------------------------------------------------------------------------------- /banktoken/__init__.py: -------------------------------------------------------------------------------- 1 | -------------------------------------------------------------------------------- /banktoken/tests/__init__.py: -------------------------------------------------------------------------------- 1 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | cryptography 2 | requests 3 | pyqrcode 4 | -------------------------------------------------------------------------------- /banktoken/tests/test_jscrypto.py: -------------------------------------------------------------------------------- 1 | # Copyright (c) 2018 Nicolás Alvarez 2 | # Licensed under the GNU General Public License version 3 or any later version. 3 | # See LICENSE.txt for details. 4 | 5 | import unittest 6 | 7 | import base64 8 | import binascii 9 | 10 | from .. import jscrypto 11 | 12 | class TestJSCrypto(unittest.TestCase): 13 | def test_key_derivation(self): 14 | # Examples from the JS library documentation 15 | self.assertEqual(jscrypto.keyDerivation('a', 128), binascii.a2b_hex('60 84 dd 49 14 7b 5d 05 7a e3 f8 81 b9 0e e7 dd'.replace(' ',''))) 16 | self.assertEqual(jscrypto.keyDerivation('b', 128), binascii.a2b_hex('b4 1a 83 4f da 4b aa 41 76 62 be d6 2c 66 83 6d'.replace(' ',''))) 17 | self.assertEqual(jscrypto.keyDerivation('\u263a', 128), binascii.a2b_hex('d1 0c cd fd 44 45 54 ef 59 aa f8 dc 78 8e 9a 7c'.replace(' ',''))) 18 | 19 | def test_decrypt_unicodepw(self): 20 | # Example from JS library comments 21 | self.assertEqual(jscrypto.aesCtrDecrypt(base64.b64decode('lwGl66VVwVObKIr6of8HVqJr'), 'p\u0101\u015f\u0161\u0175\u014d\u0159\u0111', 256), b'big secret') 22 | 23 | def test_decrypt(self): 24 | # Test embedded in phone app 25 | self.assertEqual(jscrypto.aesCtrDecrypt(base64.b64decode('jNnbU15eXl5dMsxWZ5alkd9nFoWo1Eb1t0Izj4nh5PKVMGI0hOQLBQMv8k2t'), '999999', 256), b'1426011923 KGCQPVRVHCQgTLOeaSLGFTYQC ') 26 | 27 | if __name__ == '__main__': 28 | unittest.main() 29 | -------------------------------------------------------------------------------- /activar.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python3 2 | 3 | # Copyright (c) 2018 Nicolás Alvarez 4 | # Licensed under the GNU General Public License version 3 or any later version. 5 | # See LICENSE.txt for details. 6 | 7 | import sys 8 | import re 9 | import base64 10 | import urllib.parse 11 | 12 | from banktoken import banelcotoken 13 | import pyqrcode 14 | 15 | bank_list = ', '.join(sorted(banelcotoken.bank_ids())) 16 | if len(sys.argv) != 2: 17 | print("Uso: %s \n\ndonde puede ser: %s." % (sys.argv[0], bank_list), file=sys.stderr) 18 | sys.exit(1) 19 | 20 | bank_id = sys.argv[1] 21 | if bank_id not in banelcotoken.bank_ids(): 22 | print("Banco '%s' no soportado; las opciones son: %s" % (bank_id, bank_list)) 23 | sys.exit(1) 24 | 25 | activation_code = input("Ingresá el código de asociación que figura en el ticket (8 caracteres): ") 26 | activation_code = activation_code.strip() 27 | 28 | print("Contactando servidor...", end='') 29 | sys.stdout.flush() 30 | encrypted_blob = banelcotoken.fetch_encrypted_payload(bank_id, activation_code) 31 | print() 32 | 33 | did_decrypt = False 34 | while not did_decrypt: 35 | passcode = input("Ingresá la clave que generaste en el cajero (6 dígitos): ").strip() 36 | if not re.match('^[0-9]{6}$', passcode): 37 | print("La clave debe tener 6 dígitos\n") 38 | continue 39 | 40 | try: 41 | seed = banelcotoken.decrypt_seed(encrypted_blob, passcode) 42 | did_decrypt = True 43 | except RuntimeError as e: 44 | print("Clave incorrecta\n") 45 | continue 46 | 47 | print() 48 | print("Activación correcta") 49 | 50 | seed_b32 = base64.b32encode(seed) 51 | url = 'otpauth://totp/%s?secret=%s&period=40' % (urllib.parse.quote(banelcotoken.name_from_id(bank_id)), urllib.parse.quote(seed_b32.decode('latin1'))) 52 | 53 | qr = pyqrcode.create(url, error='L') 54 | print(qr.terminal()) 55 | 56 | print("URL: %s" % url) 57 | print() 58 | print("Para activación manual:") 59 | print(" Clave plana: %s" % seed.decode('latin1')) 60 | print(" Clave Base32: %s" % seed_b32.decode('latin1')) 61 | print(" Período: 40 segundos") 62 | -------------------------------------------------------------------------------- /banktoken/jscrypto.py: -------------------------------------------------------------------------------- 1 | # Copyright (c) 2018 Nicolás Alvarez 2 | # Licensed under the GNU General Public License version 3 or any later version. 3 | # See LICENSE.txt for details. 4 | 5 | ''' 6 | This module implements AES-CTR decryption compatible with the Javascript 7 | implementation at http://www.movable-type.co.uk/scripts/aes.html. 8 | 9 | aes.js is just an implementation of AES itself; it does nothing special. 10 | 11 | aes-ctr.js has some non-standard things. The encryption function doesn't take 12 | plaintext and key; rather it takes plaintext and a password, and it does its own 13 | key derivation from the password. It also generates an IV (based on the current 14 | time) and prepends it to the returned ciphertext. Key derivation is done by 15 | using raw AES decryption with both key and plaintext set to the password (!). 16 | Decryption works similarly: it takes ciphertext (with prepended IV) and password 17 | (from which it derives the key in the same way as encryption). 18 | 19 | This module implements CTR decryption in a way compatible with that Javascript 20 | implementation. Encryption is not currently supported. 21 | ''' 22 | 23 | import cryptography 24 | 25 | from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes 26 | from cryptography.hazmat.backends import default_backend 27 | 28 | def keyDerivation(password, nBits): 29 | if nBits not in (128,192,256): 30 | raise ValueError() 31 | 32 | nBytes = nBits // 8 33 | 34 | pwBytes = password.encode('utf8').ljust(nBytes, b'\0') 35 | pwBytes16 = password.encode('utf8').ljust(16, b'\0') 36 | 37 | cipher = Cipher(algorithms.AES(pwBytes), modes.ECB(), backend=default_backend()) 38 | encryptor = cipher.encryptor() 39 | key = encryptor.update(pwBytes16) 40 | 41 | # expand key to 16/24/32 bytes long 42 | key += key[0:nBytes-16] 43 | 44 | return key 45 | 46 | def aesCtrDecrypt(ciphertext, password, nBits): 47 | if nBits not in (128,192,256): 48 | raise ValueError() 49 | 50 | # recover nonce from 1st 8 bytes of ciphertext 51 | counterBlock = ciphertext[0:8]+b'\0'*8 52 | data = ciphertext[8:] 53 | 54 | cipher = Cipher(algorithms.AES(keyDerivation(password, nBits)), modes.CTR(counterBlock), backend=default_backend()) 55 | encryptor = cipher.decryptor() 56 | return encryptor.update(ciphertext[8:]) 57 | 58 | __all__ = ['keyDerivation', 'aesCtrDecrypt'] 59 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | Este script permite activar tokens de doble factor de bancos 2 | en otras aplicaciones de 2FA, como Google Authenticator. 3 | Ideal para el que ya tiene una app con varias cuentas de 2FA, 4 | y no quiere tener que usar app otra solo para el token del banco. 5 | 6 | Actualmente los bancos soportados son **Comafi**, **BBVA**, **ICBC**, y **Santander Río**. 7 | 8 | Instrucciones 9 | ============= 10 | 11 | 1. En un cajero automático, seleccionar la opción 12 | "Claves" > "Generación de Claves" > "Comafi Token" o "Token de Seguridad" o "Token Virtual" y seguir las instrucciones. 13 | El cajero imprime un ticket con un código de asociación. 14 | **Si ya habías activado el token con la aplicación oficial del banco, 15 | dejará de funcionar al activarlo de nuevo.** 16 | 2. En la computadora, ejecutar `activar.py` en una consola, 17 | pasando el nombre del banco (`comafi`, `bbva`, `icbc` o `santander`) como parámetro. 18 | Por ejemplo, `python3 activar.py comafi`. 19 | 3. Ingresar el código de asociación. 20 | **El código de asociación se puede usar una sola vez, 21 | a partir de acá si algo sale mal no se puede volver a intentar, 22 | ni ingresar el mismo código en la app oficial, 23 | hay que obtener otro código en el cajero.** 24 | 4. Ingresar la clave numérica generada en el cajero. 25 | 5. Se muestra un código QR en la consola. 26 | Escanearlo con una aplicación [TOTP](https://en.wikipedia.org/wiki/Time-based_One-time_Password_algorithm) compatible. 27 | También se muestran datos para ingresar el token manualmente en la app. 28 | 29 | Aplicaciones compatibles 30 | ======================== 31 | 32 | Los códigos de 2FA TOTP se suelen actualizar cada 30 segundos, 33 | pero los tokens de los bancos usan un período de 40 segundos. 34 | Puede ser que algunas aplicaciones no lo soporten. 35 | 36 | Estas apps fueron probadas y sé que funcionan: 37 | 38 | **Google Authenticator para iOS**: Funciona con la URL o escaneando el código QR. 39 | No funciona ingresando el seed a mano (no soporta cambiar el período). 40 | El indicador de cuánto tiempo queda podría ser incorrecto. 41 | 42 | **OTP Auth para iOS**: Funciona con la URL o el código QR. 43 | Para ingreso manual: seleccionar Enter Credentials, ingresar la clave, guardar, 44 | editar la cuenta recién agregada, y cambiar el Period a 40 segundos. 45 | 46 | **Lastpass Authenticator**: Funciona con código QR. Creo que no soporta URL. 47 | Para ingreso manual: ingresar la clave Base32, y cambiar el período a 40 segundos en Advanced Settings. 48 | 49 | **KeePassXC**: Funciona ingresando manualmente la clave Base32 en Use Custom Settings. Seleccionar SHA-1, 40 segundos y 6 dígitos. 50 | 51 | **Authy**: *No funciona.* 52 | 53 | 54 | -------------------------------------------------------------------------------- /banktoken/tests/test_banelcotoken.py: -------------------------------------------------------------------------------- 1 | # Copyright (c) 2018 Nicolás Alvarez 2 | # Licensed under the GNU General Public License version 3 or any later version. 3 | # See LICENSE.txt for details. 4 | 5 | import unittest 6 | from unittest.mock import patch, MagicMock 7 | import base64 8 | 9 | from .. import banelcotoken 10 | 11 | TEST_PAYLOAD = b'jNnbU15eXl5dMsxWZ5alkd9nFoWo1Eb1t0Izj4nh5PKVMGI0hOQLBQMv8k2t' 12 | TEST_SEED = b'KGCQPVRVHCQgTLOeaSLGFTYQC' 13 | 14 | class TestBankToken(unittest.TestCase): 15 | def setUp(self): 16 | self.mock_response = MagicMock( 17 | status_code=200, 18 | headers={'Content-Type': 'application/javascript'}, 19 | content=b'callback(["%s"])' % TEST_PAYLOAD 20 | ) 21 | 22 | @patch('banktoken.banelcotoken.sess.get') 23 | def test_fetch(self, mock_get): 24 | '''Happy path fetching data''' 25 | mock_get.return_value = self.mock_response 26 | 27 | payload = banelcotoken.fetch_encrypted_payload('comafi', '99999999') 28 | 29 | mock_get.assert_called_once() 30 | self.assertEqual(mock_get.call_args[1]['params']['cupon'], '99999999') 31 | self.assertEqual(mock_get.call_args[1]['params']['callback'], 'callback') 32 | self.assertNotIn('bank', mock_get.call_args[1]['params']) 33 | 34 | self.assertEqual(payload, base64.b64decode(TEST_PAYLOAD)) 35 | 36 | @patch('banktoken.banelcotoken.sess.get') 37 | def test_fetch_santander(self, mock_get): 38 | '''Fetching data from another bank''' 39 | mock_get.return_value = self.mock_response 40 | 41 | payload = banelcotoken.fetch_encrypted_payload('santander', '99999999') 42 | 43 | mock_get.assert_called_once() 44 | self.assertEqual(mock_get.call_args[1]['params']['cupon'], '99999999') 45 | self.assertEqual(mock_get.call_args[1]['params']['callback'], 'callback') 46 | self.assertEqual(mock_get.call_args[1]['params']['bank'], 'RIOP') 47 | 48 | self.assertEqual(payload, base64.b64decode(TEST_PAYLOAD)) 49 | 50 | def test_decrypt(self): 51 | '''Happy path decrypting data''' 52 | seed = banelcotoken.decrypt_seed(base64.b64decode(TEST_PAYLOAD), '999999') 53 | 54 | self.assertEqual(seed, TEST_SEED) 55 | 56 | @patch('banktoken.banelcotoken.sess.get') 57 | def test_all(self, mock_get): 58 | '''Happy path end to end''' 59 | 60 | mock_get.return_value = self.mock_response 61 | 62 | seed = banelcotoken.activate('comafi', '99999999', '999999') 63 | 64 | mock_get.assert_called_once() 65 | self.assertEqual(mock_get.call_args[1]['params']['cupon'], '99999999') 66 | self.assertEqual(mock_get.call_args[1]['params']['callback'], 'callback') 67 | self.assertNotIn('bank', mock_get.call_args[1]['params']) 68 | 69 | self.assertEqual(seed, TEST_SEED) 70 | 71 | if __name__ == '__main__': 72 | unittest.main() 73 | -------------------------------------------------------------------------------- /banktoken/banelcotoken.py: -------------------------------------------------------------------------------- 1 | # Copyright (c) 2018 Nicolás Alvarez 2 | # Licensed under the GNU General Public License version 3 or any later version. 3 | # See LICENSE.txt for details. 4 | 5 | 6 | import time 7 | import re 8 | import base64 9 | 10 | import requests 11 | 12 | from . import jscrypto 13 | 14 | sess = requests.session() 15 | 16 | BANK_CONFIG = { 17 | 'comafi': {'param': None, 'name': 'Comafi Token'}, 18 | 'santander': {'param': 'RIOP', 'name': 'Santander Río'}, 19 | 'icbc': {'param': 'BSTN', 'name': 'ICBC'}, 20 | 'bbva': {'param': 'FNCS', 'name': 'BBVA'} 21 | } 22 | 23 | def bank_ids(): 24 | return BANK_CONFIG.keys() 25 | 26 | def name_from_id(bank_id): 27 | return BANK_CONFIG[bank_id]['name'] 28 | 29 | def fetch_encrypted_payload(bank_id, activation_code): 30 | params={ 31 | 'cupon': activation_code, 32 | 'callback': 'callback', 33 | '_': str(int(time.time() * 1000)) 34 | } 35 | if BANK_CONFIG[bank_id]['param'] is not None: 36 | params['bank'] = BANK_CONFIG[bank_id]['param'] 37 | 38 | r = sess.get( 39 | "https://tokenv.banelcoservices.com.ar/vuserver/activation.php", 40 | params=params 41 | ) 42 | 43 | if r.status_code != 200: 44 | raise RuntimeError("status_code not 200") # FIXME better exception 45 | 46 | content_type = r.headers.get('Content-Type', '') 47 | # if there are any parameters like "text/html;charset=utf-8" we want to remove them 48 | content_type = content_type.partition(';')[0].strip() 49 | 50 | if content_type == 'application/javascript': 51 | m = re.fullmatch(rb'callback\(\["(.*)"\]\)', r.content) 52 | if m is None: 53 | raise RuntimeError("raw response has unexpected format") 54 | 55 | b64_data = m.group(1).replace(br'\/', b'/') 56 | 57 | encrypted_blob = base64.b64decode(b64_data) 58 | return encrypted_blob 59 | 60 | elif content_type == 'text/html': 61 | if r.content == b'URL Incorrecta - contacte Soporte Security': 62 | raise RuntimeError("Got 'incorrect url' error - bad token?") 63 | else: 64 | raise RuntimeError("Got unknown error") 65 | else: 66 | raise RuntimeError("Got unexpected content type: %r" % content_type) 67 | 68 | def decrypt_seed(payload, passcode): 69 | decrypted_payload = jscrypto.aesCtrDecrypt(payload, passcode, 256) 70 | 71 | m = re.fullmatch(rb'([0-9]+) ([0-9a-zA-Z=]+) ([01]?)', decrypted_payload) 72 | if m is None: 73 | # likely decryption failed because the passcode is wrong 74 | raise RuntimeError("Decryption gave wrong format") 75 | 76 | crc, seed, forcePasscodeReset = m.groups() 77 | # TODO verify CRC 78 | return seed 79 | 80 | def activate(bank_id, activation_code, passcode): 81 | 82 | encrypted_blob = fetch_encrypted_payload(bank_id, activation_code) 83 | return decrypt_seed(encrypted_blob, passcode) 84 | 85 | -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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You may not convey a covered 525 | work if you are a party to an arrangement with a third party that is 526 | in the business of distributing software, under which you make payment 527 | to the third party based on the extent of your activity of conveying 528 | the work, and under which the third party grants, to any of the 529 | parties who would receive the covered work from you, a discriminatory 530 | patent license (a) in connection with copies of the covered work 531 | conveyed by you (or copies made from those copies), or (b) primarily 532 | for and in connection with specific products or compilations that 533 | contain the covered work, unless you entered into that arrangement, 534 | or that patent license was granted, prior to 28 March 2007. 535 | 536 | Nothing in this License shall be construed as excluding or limiting 537 | any implied license or other defenses to infringement that may 538 | otherwise be available to you under applicable patent law. 539 | 540 | 12. No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | --------------------------------------------------------------------------------