82 lines
2.4 KiB
Python
Executable File
82 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
# matrix_decrypt - Download and decrypt an encrypted attachment
|
|
# from a matrix server
|
|
|
|
# Copyright © 2019 Damir Jelić <poljar@termina.org.uk>
|
|
#
|
|
# Permission to use, copy, modify, and/or distribute this software for
|
|
# any purpose with or without fee is hereby granted, provided that the
|
|
# above copyright notice and this permission notice appear in all copies.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
|
|
# RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
|
|
# CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
|
|
# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
import argparse
|
|
import requests
|
|
import tempfile
|
|
import subprocess
|
|
|
|
from urllib.parse import urlparse, parse_qs
|
|
from nio.crypto import decrypt_attachment
|
|
|
|
|
|
def save_file(data):
|
|
"""Save data to a temporary file and return its name."""
|
|
tmp_dir = tempfile.gettempdir()
|
|
|
|
with tempfile.NamedTemporaryFile(
|
|
prefix='plumber-',
|
|
dir=tmp_dir,
|
|
delete=False
|
|
) as f:
|
|
f.write(data)
|
|
f.flush()
|
|
return f.name
|
|
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser(
|
|
description='Download and decrypt matrix attachments'
|
|
)
|
|
parser.add_argument('url', help='the url of the attachment')
|
|
parser.add_argument('--plumber',
|
|
help='program that gets called with the '
|
|
'dowloaded file')
|
|
|
|
args = parser.parse_args()
|
|
url = urlparse(args.url)
|
|
query = parse_qs(url.query)
|
|
|
|
if not query["key"] or not query["iv"] or not query["hash"]:
|
|
print("Missing decryption argument")
|
|
return -1
|
|
|
|
key = query["key"][0]
|
|
iv = query["iv"][0]
|
|
hash = query["hash"][0]
|
|
|
|
http_url = "https://{}{}".format(url.netloc, url.path)
|
|
|
|
request = requests.get(http_url)
|
|
|
|
if not request.ok:
|
|
print("Error downloading file")
|
|
return -2
|
|
|
|
plumber = args.plumber or "/usr/bin/rifle"
|
|
plaintext = decrypt_attachment(request.content, key, hash, iv)
|
|
file_name = save_file(plaintext)
|
|
|
|
subprocess.run([plumber, "{file}".format(file=file_name)])
|
|
|
|
return 0
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|