├── .gitignore ├── requirements.txt ├── config.json ├── README.md ├── avred_server.py ├── amsiscan.py └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | __pycache__/ -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | flask 2 | PythonForWindows 3 | brotli -------------------------------------------------------------------------------- /config.json: -------------------------------------------------------------------------------- 1 | { 2 | "bind_ip": "0.0.0.0", 3 | "port": 8001, 4 | "engine": "amsi" 5 | } -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # avred-server 2 | 3 | Provides an HTTP interface to scan files with the installed AntiVirus software on Windows via AMSI. 4 | 5 | 6 | ## Details 7 | 8 | To be used with the AV Reduction (avred) project. Exposes a port, which accepts a (virus) file and runs an AV against it. 9 | 10 | Returns ```{"detected": true}``` if file was detected by AV, or ```{"detected": false}``` if it wasn't. 11 | 12 | 13 | ## Setup 14 | 15 | 0. Create a Windows VM and install the AV of your choosing (or use pre-installed Defender) 16 | 1. install python3, pip3 17 | 2. `pip -r requirements.txt` 18 | 3. Disable sample submission on your AV 19 | 4. Browser to `http://localhost:8001/test` to check if it works 20 | 21 | Note: If you get a `ImportError: DLL load failed while importing _brotli", see 22 | https://github.com/google/brotli/issues/782, solution is: 23 | 24 | install "vc_redist.x64.exe" from this link https://support.microsoft.com/en-gb/help/2977003/the-latest-supported-visual-c-downloads 25 | 26 | ## Run it as a windows service 27 | 28 | Use nssm 2.24.101 from https://nssm.cc/ 64 bit version, use a admin terminal. 29 | 30 | Find `python.exe` path: 31 | ``` 32 | C:\Users\hacker\Downloads>where python.exe 33 | C:\Users\hacker\AppData\Local\Programs\Python\Python310\python.exe 34 | C:\Users\hacker\AppData\Local\Microsoft\WindowsApps\python.exe 35 | ``` 36 | 37 | Configure service: 38 | ``` 39 | nssm.exe install AvredServer 40 | ``` 41 | 42 | Set exe, working directory and target python. Like: 43 | 44 | ``` 45 | nssm.exe set AvredServer Application "C:\Users\hacker\AppData\Local\Programs\Python\Python310\python.exe" 46 | nssm.exe set AvredServer AppDirectory "C:\Users\hacker\Desktop\avred-server\" 47 | nssm.exe set AvredServer AppParameters "C:\Users\hacker\Desktop\avred-server\avred_server.py" 48 | nssm.exe start AvredServer 49 | ``` 50 | 51 | Test with `http://localhost:8001/test` 52 | -------------------------------------------------------------------------------- /avred_server.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python3 2 | import argparse 3 | import logging 4 | import logging 5 | from flask import Flask, request, jsonify 6 | from json import load 7 | import brotli 8 | 9 | from amsiscan import AMSIScanner 10 | 11 | 12 | app = Flask(__name__) 13 | conf = {} 14 | EICAR = b"X5O!P%@AP[4\\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*" 15 | 16 | 17 | @app.route("/") 18 | def index(): 19 | return jsonify({ 20 | "msg": f"AV Server {conf['engine']} is up.", 21 | "api": { 22 | "GET /": "this screen", 23 | "GET /test": "test if config works", 24 | "POST /scan": "scan a file, body=virus_bytes" 25 | } 26 | }) 27 | 28 | 29 | @app.route("/scan", methods=["POST"]) 30 | def scan_route(): 31 | contents = request.get_data() 32 | 33 | if request.args.get('brotli', "False") == "True": 34 | contents = brotli.decompress(contents) 35 | 36 | if 'filename' in request.args: 37 | filename = request.args['filename'] 38 | 39 | try: 40 | return jsonify({ 41 | "detected": scan(contents) 42 | }) 43 | except BaseException as e: # handle exceptions at client side too! 44 | return jsonify({ 45 | "exception": str(e) 46 | }), 500 47 | 48 | 49 | @app.route("/test") 50 | def test_server(conf=conf): 51 | """ 52 | Tests if config is working correctly, returns 500 otherwise 53 | """ 54 | 55 | try: 56 | logging.info("Test malicous...") 57 | mal_det = scan(EICAR) 58 | logging.info("Test benign...") 59 | benign_det = scan(b"Not malicous") 60 | 61 | except BaseException as e: 62 | logging.info("Tests failed, please check config and log above.") 63 | return jsonify({ 64 | "exception": str(e) 65 | }), 500 66 | 67 | if not mal_det or benign_det: 68 | logging.info("Tests failed, malicous should be detected, and benign not detected.") 69 | logging.info("Please check your config and the log above.") 70 | return jsonify({ 71 | "malicous detected": mal_det, 72 | "benign detected": benign_det, 73 | "msg": "bugs, check your server log" 74 | }), 500 75 | 76 | return jsonify({ 77 | "malicous detected": mal_det, 78 | "benign detected": benign_det, 79 | "msg": "working as intended" 80 | }) 81 | 82 | 83 | 84 | def load_config(conf): 85 | with open("config.json") as f: 86 | data = load(f) 87 | 88 | # load general config 89 | for k, v in data.items(): 90 | conf[k] = v 91 | 92 | 93 | def run_server(conf): 94 | load_config(conf) 95 | app.run(conf["bind_ip"], conf["port"]) 96 | 97 | 98 | def scan(contents): 99 | with AMSIScanner() as amsiScanner: 100 | res = amsiScanner.scan(contents) 101 | 102 | r = str(res) 103 | if 'AMSI_RESULT_DETECTED' in r or 'AMSI_RESULT_BLOCKED' in r: 104 | return True 105 | elif 'AMSI_RESULT_CLEAN' in r or 'AMSI_RESULT_NOT_DETECTED' in r: 106 | return False 107 | else: 108 | raise Exception("Scanner error: {}".format(r)) 109 | 110 | 111 | if __name__ == "__main__": 112 | run_server(conf) 113 | -------------------------------------------------------------------------------- /amsiscan.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python3 2 | import sys 3 | import windows 4 | import windows.winproxy 5 | import windows.generated_def as gdef 6 | 7 | # From: (no license) 8 | # https://gist.github.com/masthoon/8ada1d19e6e217481aa881fab16b5970 9 | 10 | 11 | class AMSIProxy(windows.winproxy.ApiProxy): 12 | APIDLL = "Amsi" 13 | default_error_check = staticmethod(windows.winproxy.no_error_check) 14 | 15 | """ 16 | HRESULT WINAPI AmsiInitialize( 17 | _In_ LPCWSTR appName, 18 | /*_In_ DWORD coInit, REMOVED */ 19 | _Out_ HAMSICONTEXT *amsiContext 20 | ); 21 | """ 22 | AmsiInitializePrototype = gdef.WINFUNCTYPE(gdef.BOOL, gdef.LPCWSTR, gdef.POINTER(gdef.PVOID)) 23 | AmsiInitializeParams = ((1, 'appName'),(1, 'amsiContext')) 24 | 25 | @AMSIProxy('AmsiInitialize', deffunc_module=sys.modules[__name__]) 26 | def AmsiInitialize(appName, amsiContext): 27 | return AmsiInitialize.ctypes_function(appName, amsiContext) 28 | 29 | 30 | """ 31 | HRESULT WINAPI AmsiOpenSession( 32 | _In_ HAMSICONTEXT amsiContext, 33 | _Out_ HAMSISESSION *session 34 | ); 35 | """ 36 | AmsiOpenSessionPrototype = gdef.WINFUNCTYPE(gdef.BOOL, gdef.PVOID, gdef.POINTER(gdef.PVOID)) 37 | AmsiOpenSessionParams = ((1, 'amsiContext'),(1, 'session')) 38 | 39 | @AMSIProxy('AmsiOpenSession', deffunc_module=sys.modules[__name__]) 40 | def AmsiOpenSession(amsiContext, session): 41 | return AmsiOpenSession.ctypes_function(amsiContext, session) 42 | 43 | 44 | """ 45 | HRESULT WINAPI AmsiScanBuffer( 46 | _In_ HAMSICONTEXT amsiContext, 47 | _In_ PVOID buffer, 48 | _In_ ULONG length, 49 | _In_ LPCWSTR contentName, 50 | _In_opt_ HAMSISESSION session, 51 | _Out_ AMSI_RESULT *result 52 | ); 53 | """ 54 | AmsiScanBufferPrototype = gdef.WINFUNCTYPE(gdef.BOOL, gdef.PVOID, gdef.PVOID, gdef.ULONG, gdef.LPCWSTR, gdef.PVOID, gdef.POINTER(gdef.ULONG)) 55 | AmsiScanBufferParams = ((1, 'amsiContext'),(1, 'buffer'),(1, 'length'),(1, 'contentName'),(1, 'session'),(1, 'result')) 56 | 57 | @AMSIProxy('AmsiScanBuffer', deffunc_module=sys.modules[__name__]) 58 | def AmsiScanBuffer(amsiContext, buffer, length, contentName, session, result): 59 | return AmsiScanBuffer.ctypes_function(amsiContext, buffer, length, contentName, session, result) 60 | 61 | """ 62 | typedef enum AMSI_RESULT { 63 | AMSI_RESULT_CLEAN = 0, 64 | AMSI_RESULT_NOT_DETECTED = 1, 65 | AMSI_RESULT_BLOCKED_BY_ADMIN_START = 16384, 66 | AMSI_RESULT_BLOCKED_BY_ADMIN_END = 20479, 67 | AMSI_RESULT_DETECTED = 32768 68 | } AMSI_RESULT; 69 | BOOL AmsiResultIsMalware( 70 | _In_ AMSI_RESULT r 71 | ); 72 | """ 73 | 74 | AMSI_RESULT_CLEAN = gdef.EnumValue("_AMSI_RESULT", "AMSI_RESULT_CLEAN", 0x0) 75 | AMSI_RESULT_NOT_DETECTED = gdef.EnumValue("_AMSI_RESULT", "AMSI_RESULT_NOT_DETECTED", 0x1) 76 | AMSI_RESULT_BLOCKED_BY_ADMIN_START = gdef.EnumValue("_AMSI_RESULT", "AMSI_RESULT_BLOCKED_BY_ADMIN_START", 16384) 77 | AMSI_RESULT_BLOCKED_BY_ADMIN_END = gdef.EnumValue("_AMSI_RESULT", "AMSI_RESULT_BLOCKED_BY_ADMIN_END", 20479) 78 | AMSI_RESULT_DETECTED = gdef.EnumValue("_AMSI_RESULT", "AMSI_RESULT_DETECTED", 32768) 79 | class _AMSI_RESULT(gdef.EnumType): 80 | values = [AMSI_RESULT_CLEAN, AMSI_RESULT_NOT_DETECTED, AMSI_RESULT_BLOCKED_BY_ADMIN_START, AMSI_RESULT_BLOCKED_BY_ADMIN_END, AMSI_RESULT_DETECTED] 81 | mapper = {x:x for x in values} 82 | AMSI_RESULT = _AMSI_RESULT 83 | 84 | 85 | class AMSIScanner(object): 86 | def __enter__(self): 87 | self.context = gdef.PVOID() 88 | self.session = gdef.PVOID() 89 | 90 | if AmsiInitialize("TestEngine", self.context) != 0: 91 | print("AmsiInitialize failed!") 92 | 93 | if AmsiOpenSession(self.context, self.session) != 0: 94 | print("AmsiOpenSession failed!") 95 | return self 96 | 97 | def __exit__(self, exc_type, exc_val, exc_tb): 98 | pass # TODO release the AMSI engine 99 | 100 | def scan(self, buffer): 101 | result = AMSI_RESULT() 102 | AmsiScanBuffer(self.context, buffer, len(buffer), "fakefile.bin", self.session, result) 103 | return result 104 | 105 | 106 | if __name__ == '__main__': 107 | with AMSIScanner() as scanner: 108 | print("Scanning ABC:") 109 | res = scanner.scan(b'ABC') 110 | print("\t{}".format(res)) 111 | print("Scanning EICAR:") 112 | res = scanner.scan(b'X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*') 113 | print("\t{}".format(res)) 114 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | ### GNU GENERAL PUBLIC LICENSE 2 | 3 | Version 3, 29 June 2007 4 | 5 | Copyright (C) 2007 Free Software Foundation, Inc. 6 | 7 | 8 | Everyone is permitted to copy and distribute verbatim copies of this 9 | license document, but changing it is not allowed. 10 | 11 | ### Preamble 12 | 13 | The GNU General Public License is a free, copyleft license for 14 | software and other kinds of works. 15 | 16 | The licenses for most software and other practical works are designed 17 | to take away your freedom to share and change the works. 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If the Program as you 386 | received it, or any part of it, contains a notice stating that it is 387 | governed by this License along with a term that is a further 388 | restriction, you may remove that term. If a license document contains 389 | a further restriction but permits relicensing or conveying under this 390 | License, you may add to a covered work material governed by the terms 391 | of that license document, provided that the further restriction does 392 | not survive such relicensing or conveying. 393 | 394 | If you add terms to a covered work in accord with this section, you 395 | must place, in the relevant source files, a statement of the 396 | additional terms that apply to those files, or a notice indicating 397 | where to find the applicable terms. 398 | 399 | Additional terms, permissive or non-permissive, may be stated in the 400 | form of a separately written license, or stated as exceptions; the 401 | above requirements apply either way. 402 | 403 | #### 8. Termination. 404 | 405 | You may not propagate or modify a covered work except as expressly 406 | provided under this License. Any attempt otherwise to propagate or 407 | modify it is void, and will automatically terminate your rights under 408 | this License (including any patent licenses granted under the third 409 | paragraph of section 11). 410 | 411 | However, if you cease all violation of this License, then your license 412 | from a particular copyright holder is reinstated (a) provisionally, 413 | unless and until the copyright holder explicitly and finally 414 | terminates your license, and (b) permanently, if the copyright holder 415 | fails to notify you of the violation by some reasonable means prior to 416 | 60 days after the cessation. 417 | 418 | Moreover, your license from a particular copyright holder is 419 | reinstated permanently if the copyright holder notifies you of the 420 | violation by some reasonable means, this is the first time you have 421 | received notice of violation of this License (for any work) from that 422 | copyright holder, and you cure the violation prior to 30 days after 423 | your receipt of the notice. 424 | 425 | Termination of your rights under this section does not terminate the 426 | licenses of parties who have received copies or rights from you under 427 | this License. If your rights have been terminated and not permanently 428 | reinstated, you do not qualify to receive new licenses for the same 429 | material under section 10. 430 | 431 | #### 9. Acceptance Not Required for Having Copies. 432 | 433 | You are not required to accept this License in order to receive or run 434 | a copy of the Program. Ancillary propagation of a covered work 435 | occurring solely as a consequence of using peer-to-peer transmission 436 | to receive a copy likewise does not require acceptance. However, 437 | nothing other than this License grants you permission to propagate or 438 | modify any covered work. These actions infringe copyright if you do 439 | not accept this License. Therefore, by modifying or propagating a 440 | covered work, you indicate your acceptance of this License to do so. 441 | 442 | #### 10. Automatic Licensing of Downstream Recipients. 443 | 444 | Each time you convey a covered work, the recipient automatically 445 | receives a license from the original licensors, to run, modify and 446 | propagate that work, subject to this License. You are not responsible 447 | for enforcing compliance by third parties with this License. 448 | 449 | An "entity transaction" is a transaction transferring control of an 450 | organization, or substantially all assets of one, or subdividing an 451 | organization, or merging organizations. If propagation of a covered 452 | work results from an entity transaction, each party to that 453 | transaction who receives a copy of the work also receives whatever 454 | licenses to the work the party's predecessor in interest had or could 455 | give under the previous paragraph, plus a right to possession of the 456 | Corresponding Source of the work from the predecessor in interest, if 457 | the predecessor has it or can get it with reasonable efforts. 458 | 459 | You may not impose any further restrictions on the exercise of the 460 | rights granted or affirmed under this License. For example, you may 461 | not impose a license fee, royalty, or other charge for exercise of 462 | rights granted under this License, and you may not initiate litigation 463 | (including a cross-claim or counterclaim in a lawsuit) alleging that 464 | any patent claim is infringed by making, using, selling, offering for 465 | sale, or importing the Program or any portion of it. 466 | 467 | #### 11. Patents. 468 | 469 | A "contributor" is a copyright holder who authorizes use under this 470 | License of the Program or a work on which the Program is based. The 471 | work thus licensed is called the contributor's "contributor version". 472 | 473 | A contributor's "essential patent claims" are all patent claims owned 474 | or controlled by the contributor, whether already acquired or 475 | hereafter acquired, that would be infringed by some manner, permitted 476 | by this License, of making, using, or selling its contributor version, 477 | but do not include claims that would be infringed only as a 478 | consequence of further modification of the contributor version. For 479 | purposes of this definition, "control" includes the right to grant 480 | patent sublicenses in a manner consistent with the requirements of 481 | this License. 482 | 483 | Each contributor grants you a non-exclusive, worldwide, royalty-free 484 | patent license under the contributor's essential patent claims, to 485 | make, use, sell, offer for sale, import and otherwise run, modify and 486 | propagate the contents of its contributor version. 487 | 488 | In the following three paragraphs, a "patent license" is any express 489 | agreement or commitment, however denominated, not to enforce a patent 490 | (such as an express permission to practice a patent or covenant not to 491 | sue for patent infringement). To "grant" such a patent license to a 492 | party means to make such an agreement or commitment not to enforce a 493 | patent against the party. 494 | 495 | If you convey a covered work, knowingly relying on a patent license, 496 | and the Corresponding Source of the work is not available for anyone 497 | to copy, free of charge and under the terms of this License, through a 498 | publicly available network server or other readily accessible means, 499 | then you must either (1) cause the Corresponding Source to be so 500 | available, or (2) arrange to deprive yourself of the benefit of the 501 | patent license for this particular work, or (3) arrange, in a manner 502 | consistent with the requirements of this License, to extend the patent 503 | license to downstream recipients. "Knowingly relying" means you have 504 | actual knowledge that, but for the patent license, your conveying the 505 | covered work in a country, or your recipient's use of the covered work 506 | in a country, would infringe one or more identifiable patents in that 507 | country that you have reason to believe are valid. 508 | 509 | If, pursuant to or in connection with a single transaction or 510 | arrangement, you convey, or propagate by procuring conveyance of, a 511 | covered work, and grant a patent license to some of the parties 512 | receiving the covered work authorizing them to use, propagate, modify 513 | or convey a specific copy of the covered work, then the patent license 514 | you grant is automatically extended to all recipients of the covered 515 | work and works based on it. 516 | 517 | A patent license is "discriminatory" if it does not include within the 518 | scope of its coverage, prohibits the exercise of, or is conditioned on 519 | the non-exercise of one or more of the rights that are specifically 520 | granted under this License. You may not convey a covered work if you 521 | are a party to an arrangement with a third party that is in the 522 | business of distributing software, under which you make payment to the 523 | third party based on the extent of your activity of conveying the 524 | work, and under which the third party grants, to any of the parties 525 | who would receive the covered work from you, a discriminatory patent 526 | license (a) in connection with copies of the covered work conveyed by 527 | you (or copies made from those copies), or (b) primarily for and in 528 | connection with specific products or compilations that contain the 529 | covered work, unless you entered into that arrangement, or that patent 530 | license was granted, prior to 28 March 2007. 531 | 532 | Nothing in this License shall be construed as excluding or limiting 533 | any implied license or other defenses to infringement that may 534 | otherwise be available to you under applicable patent law. 535 | 536 | #### 12. No Surrender of Others' Freedom. 537 | 538 | If conditions are imposed on you (whether by court order, agreement or 539 | otherwise) that contradict the conditions of this License, they do not 540 | excuse you from the conditions of this License. If you cannot convey a 541 | covered work so as to satisfy simultaneously your obligations under 542 | this License and any other pertinent obligations, then as a 543 | consequence you may not convey it at all. For example, if you agree to 544 | terms that obligate you to collect a royalty for further conveying 545 | from those to whom you convey the Program, the only way you could 546 | satisfy both those terms and this License would be to refrain entirely 547 | from conveying the Program. 548 | 549 | #### 13. Use with the GNU Affero General Public License. 550 | 551 | Notwithstanding any other provision of this License, you have 552 | permission to link or combine any covered work with a work licensed 553 | under version 3 of the GNU Affero General Public License into a single 554 | combined work, and to convey the resulting work. The terms of this 555 | License will continue to apply to the part which is the covered work, 556 | but the special requirements of the GNU Affero General Public License, 557 | section 13, concerning interaction through a network will apply to the 558 | combination as such. 559 | 560 | #### 14. Revised Versions of this License. 561 | 562 | The Free Software Foundation may publish revised and/or new versions 563 | of the GNU General Public License from time to time. Such new versions 564 | will be similar in spirit to the present version, but may differ in 565 | detail to address new problems or concerns. 566 | 567 | Each version is given a distinguishing version number. If the Program 568 | specifies that a certain numbered version of the GNU General Public 569 | License "or any later version" applies to it, you have the option of 570 | following the terms and conditions either of that numbered version or 571 | of any later version published by the Free Software Foundation. If the 572 | Program does not specify a version number of the GNU General Public 573 | License, you may choose any version ever published by the Free 574 | Software Foundation. 575 | 576 | If the Program specifies that a proxy can decide which future versions 577 | of the GNU General Public License can be used, that proxy's public 578 | statement of acceptance of a version permanently authorizes you to 579 | choose that version for the Program. 580 | 581 | Later license versions may give you additional or different 582 | permissions. However, no additional obligations are imposed on any 583 | author or copyright holder as a result of your choosing to follow a 584 | later version. 585 | 586 | #### 15. Disclaimer of Warranty. 587 | 588 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 589 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 590 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT 591 | WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT 592 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 593 | A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND 594 | PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE 595 | DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR 596 | CORRECTION. 597 | 598 | #### 16. Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR 602 | CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 603 | INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES 604 | ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT 605 | NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR 606 | LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM 607 | TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER 608 | PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 609 | 610 | #### 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | ### How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these 626 | terms. 627 | 628 | To do so, attach the following notices to the program. It is safest to 629 | attach them to the start of each source file to most effectively state 630 | the exclusion of warranty; and each file should have at least the 631 | "copyright" line and a pointer to where the full notice is found. 632 | 633 | 634 | Copyright (C) 635 | 636 | This program is free software: you can redistribute it and/or modify 637 | it under the terms of the GNU General Public License as published by 638 | the Free Software Foundation, either version 3 of the License, or 639 | (at your option) any later version. 640 | 641 | This program is distributed in the hope that it will be useful, 642 | but WITHOUT ANY WARRANTY; without even the implied warranty of 643 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 644 | GNU General Public License for more details. 645 | 646 | You should have received a copy of the GNU General Public License 647 | along with this program. If not, see . 648 | 649 | Also add information on how to contact you by electronic and paper 650 | 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 661 | appropriate parts of the General Public License. Of course, your 662 | program's commands might be different; for a GUI interface, you would 663 | use an "about box". 664 | 665 | You should also get your employer (if you work as a programmer) or 666 | school, if any, to sign a "copyright disclaimer" for the program, if 667 | necessary. For more information on this, and how to apply and follow 668 | the GNU GPL, see . 669 | 670 | The GNU General Public License does not permit incorporating your 671 | program into proprietary programs. If your program is a subroutine 672 | library, you may consider it more useful to permit linking proprietary 673 | applications with the library. If this is what you want to do, use the 674 | GNU Lesser General Public License instead of this License. But first, 675 | please read . 676 | --------------------------------------------------------------------------------