Retrieve Windows Credential via Python

wincred.py

#!python3
"""
Access windows credentials
"""
from typing import Tuple
import ctypes as CT
import ctypes.wintypes as WT

CRED_TYPE_GENERIC = 0x01

LPBYTE = CT.POINTER(WT.BYTE)
LPWSTR = WT.LPWSTR
LPCWSTR = WT.LPWSTR
class CREDENTIAL_ATTRIBUTE(CT.Structure):
    _fields_ = [
        ('Keyword', LPWSTR),
        ('Flags', WT.DWORD),
        ('ValueSize', WT.DWORD),
        ('Value', LPBYTE)]
PCREDENTIAL_ATTRIBUTE = CT.POINTER(CREDENTIAL_ATTRIBUTE)
class CREDENTIAL(CT.Structure):
    _fields_ = [
        ('Flags', WT.DWORD),
        ('Type', WT.DWORD),
        ('TargetName', LPWSTR),
        ('Comment', LPWSTR),
        ('LastWritten', WT.FILETIME),
        ('CredentialBlobSize', WT.DWORD),
        ('CredentialBlob', LPBYTE),
        ('Persist', WT.DWORD),
        ('AttributeCount', WT.DWORD),
        ('Attributes', PCREDENTIAL_ATTRIBUTE),
        ('TargetAlias', LPWSTR),
        ('UserName', LPWSTR)]
PCREDENTIAL = CT.POINTER(CREDENTIAL)

advapi32 = CT.WinDLL('Advapi32.dll')
advapi32.CredReadA.restype = WT.BOOL
advapi32.CredReadA.argtypes = [LPCWSTR, WT.DWORD, WT.DWORD, CT.POINTER(PCREDENTIAL)]


def GetGenericCredential(name:str) -> Tuple[str, str]:
    """
    Returns a Tuple of Name and Password of a Generic Windows Credential
    Uses bytes in Py3 and str in Py2 for url, name and password.
    """
    cred_ptr = PCREDENTIAL()
    if advapi32.CredReadW(name, CRED_TYPE_GENERIC, 0, CT.byref(cred_ptr)):
        username = cred_ptr.contents.UserName
        cred_blob = cred_ptr.contents.CredentialBlob
        cred_blob_size = cred_ptr.contents.CredentialBlobSize
        cred_str = CT.string_at(cred_blob, cred_blob_size)
        password = cred_str.decode('utf-16le', errors='ignore')
        advapi32.CredFree(cred_ptr)
        return username, password
    else:
        raise IOError("Failure reading credential")


def main():
    name, pwd = GetGenericCredential('git:https://github.com')
    print("GITHUB NAME:", name)
    print("GITHUB PASSWORD:", pwd)


if __name__ == '__main__':
    main()

I'm using this script in a node package. See: https://github.com/rolangom/wincred

I used a scarcely modified version of your code, posted here, to allow automating Box.com with Robin, the RPA language.
Works great, thank you!

A little improvement, I think...

import codecs

password = CT.string_at(cred_blob,cred_blob_size).decode('utf-16le', errors='ignore')

@apolkosnik: Thx for this tip. I incorporated it into my code...

Question : how can I get the Windows Session Password using Python ?

Do you mean the current windows users password? I am pretty sure that this is not possible (neither with python nor with C). It would be a big security flaw.