Python script to decrypt passwords stored by mRemoteNG

python3 mremoteng_decrypt.py -s STRING [-p CUSTOM_PASSWORD] OR python3 mremoteng_decrypt.py -f FILE [-p CUSTOM_PASSWORD]

Catch exception to revert to default so this doesn't happen:

$ python3 mremoteng_decrypt.py -s "s1L[...]Q=" -p grace
Traceback (most recent call last):
  File "/home/a/mremoteng_decrypt.py", line 49, in <module>
    main()
  File "/home/a/mremoteng_decrypt.py", line 45, in main
    plaintext = cipher.decrypt_and_verify(ciphertext, tag)
  File "/usr/lib/python3/dist-packages/Cryptodome/Cipher/_mode_gcm.py", line 567, in decrypt_and_verify
    self.verify(received_mac_tag)
  File "/usr/lib/python3/dist-packages/Cryptodome/Cipher/_mode_gcm.py", line 508, in verify
    raise ValueError("MAC check failed")
ValueError: MAC check failed

$ python3 mremoteng_decrypt.py -s "s1L[...]Q="
Password: 

Exercise responsibility and abide by legal standards while using this software. Unauthorized penetration testing is prohibited and illegal.

• General Use: This software is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose, and non-infringement. In no event shall the authors or copyright holders be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or the use or other dealings in the software.
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• Unauthorized Access: Using "mRemoteNG-Decrypt" to access, probe, or connect to systems, networks, or data without explicit permission from appropriate parties is strictly discouraged, unethical, and illegal. Unauthorized access to systems, networks, or data breaches various local, national, and international laws, and can result in severe legal consequences. Always obtain the necessary permissions before accessing any systems or data. The developers of "mRemoteNG-Decrypt" disavow any actions taken by individuals or entities that use this software for unauthorized activities.

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