Password and Username

Aug 29, 2019 at 4:40pm
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Last edited on Oct 11, 2019 at 4:32am
Aug 29, 2019 at 4:45pm
where are your username and password ? Are you asking how to access like a corporation's credentials management? Or is this a local or remote machine? Or an encrypted file or folder? Does the user/pwd change?
How secure does this need to be?

as soon as you say its for work, I think you are asking a "big question" ...
Aug 29, 2019 at 4:48pm
From what I can tell, you can use the LogonUser API.
See: https://support.microsoft.com/en-us/help/180548/how-to-validate-user-credentials-on-microsoft-operating-systems
(Edit: Apologies but their example is trash and won't compile without multiple places where you have to adjust manually)

It also provides example code in the page... but it's complicated, as are most things when directly using Win32.

I actually would suggest doing this in C#, where it can be much simpler
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PrincipalContext context = new PrincipalContext(ContextType.Machine);
bool valid = false;
try
{
    UserPrincipal userPrincipal = new UserPrincipal(context, my_username, my_password, true);
    valid = userPrincipal.Context.ValidateCredentials(user.SamAccountName, my_password, ContextOptions.Negotiate);
}
catch (Exception)
{
    valid = false;
}


Requires linking with System.DirectoryServices.AccountManagement assemblies.
Last edited on Aug 29, 2019 at 6:49pm
Aug 29, 2019 at 4:48pm
Here's a very simple implementation. You make it better from here :)

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#include <string>
#include <iostream>

int main()
{
  std::cout << "Enter name: \n";
  std::string name;
  std::cin >> name;

  std::cout << "Enter password: \n";
  std::string password;
  std::cin >> password;

  if (name == "callie" &&
     password == "france")
  {
    std::cout << "Do something";
  }
  else
  {
    std::cout << "Wrong name / password";
  }
}

Aug 30, 2019 at 2:59am
MS doesn’t like to keep everything together when dealing with this topic.
Give me a little bit and I’ll post you something you can use.
Aug 30, 2019 at 10:09am
closed account (4w0o1hU5)
You may want to hide the password text, I suggest:

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#include <iostream>
#include <string>
#include <windows.h>

using namespace std;

int main()
{
    HANDLE hStdin = GetStdHandle(STD_INPUT_HANDLE); 
    DWORD mode = 0;
    GetConsoleMode(hStdin, &mode);
    SetConsoleMode(hStdin, mode & (~ENABLE_ECHO_INPUT));

    string s;
    getline(cin, s);

    cout << s << endl;
    return 0;
}//main  

cleanup:
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SetConsoleMode(hStdin, mode);

tcsetattr(STDIN_FILENO, TCSANOW, &oldt);

Last edited on Aug 30, 2019 at 11:37am
Sep 4, 2019 at 6:42am
Hey, sorry I couldn't post back on this one as soon as I would have liked. Did you get a satisfactory answer? Or would you still like an example using the Windows CredUI API?
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