private static object MarshalNativeToManaged(IntPtr nativeDataPtr)
{
if (nativeDataPtr == IntPtr.Zero)
{
return(null);
}
WindowsCredentialTypes.NativeCredential rawCredential =
(WindowsCredentialTypes.NativeCredential)Marshal.PtrToStructure(nativeDataPtr, typeof(WindowsCredentialTypes.NativeCredential));
WindowsCredentialTypes.Credential cred = new WindowsCredentialTypes.Credential()
{
UserName = Marshal.PtrToStringUni(rawCredential.UserName),
TargetName = Marshal.PtrToStringUni(rawCredential.TargetName),
TargetAlias = Marshal.PtrToStringUni(rawCredential.TargetAlias),
Persist = (WindowsCredentialTypes.CredentialPersist)rawCredential.Persist,
Comment = Marshal.PtrToStringUni(rawCredential.Comment),
Flags = rawCredential.Flags,
LastWritten = rawCredential.LastWritten,
Type = rawCredential.Type,
CredentialBlob = Marshal.PtrToStringUni(rawCredential.CredentialBlob),
CredentialBlobSize = rawCredential.CredentialBlobSize,
Attributes = new WindowsCredentialTypes.CredentialAttribute[rawCredential.AttributeCount],
AttributeCount = rawCredential.AttributeCount
};
// ToDo: Fill the Attributes array with values. It is not important because the information is not needed and the complexity to marshal this data is quite high.
CredFree(nativeDataPtr);
return(cred);
}
/// <summary>
/// This method derives a NativeCredential instance from a given Credential instance.
/// </summary>
/// <param name="cred">The managed Credential counterpart containing data to be stored.</param>
/// <returns>A NativeCredential instance that is derived from the given Credential
/// instance.</returns>
private static WindowsCredentialTypes.NativeCredential GetNativeCredential(WindowsCredentialTypes.Credential cred)
{
WindowsCredentialTypes.NativeCredential ncred = new WindowsCredentialTypes.NativeCredential();
ncred.AttributeCount = 0;
ncred.Attributes = IntPtr.Zero;
ncred.Comment = IntPtr.Zero;
ncred.TargetAlias = IntPtr.Zero;
ncred.Type = (WindowsCredentialTypes.CredentialType)cred.Type;
ncred.Persist = (UInt32)cred.Persist;
ncred.CredentialBlobSize = (UInt32)cred.CredentialBlobSize;
ncred.TargetName = Marshal.StringToCoTaskMemUni(cred.TargetName);
ncred.CredentialBlob = Marshal.StringToCoTaskMemUni(cred.CredentialBlob);
ncred.UserName = Marshal.StringToCoTaskMemUni(cred.UserName);
return(ncred);
}
/// <summary>
/// Check if the entry exists. Ignore for now the passoword.
/// </summary>
public bool Exist(string targetName, string userName, string password, WindowsCredentialTypes.CredentialType type)
{
IntPtr credPtr;
if (CredRead(targetName, type, 0, out credPtr))
{
WindowsCredentialTypes.Credential cred = (WindowsCredentialTypes.Credential)MarshalNativeToManaged(credPtr);
return(cred.TargetName.Equals(targetName, StringComparison.CurrentCultureIgnoreCase) &&
(cred.UserName.Equals(userName, StringComparison.CurrentCultureIgnoreCase) ||
userName.IsNullOrEmpty()));
}
else
{
return(false);
}
}
public bool Add(string targetName, string userName, string password, WindowsCredentialTypes.CredentialType type, WindowsCredentialTypes.CredentialPersist persist)
{
// Check if the password is not too long.
byte[] byteArray = Encoding.Unicode.GetBytes(password);
if (byteArray.Length > 512)
{
throw new ArgumentOutOfRangeException("The password has exceeded 512 bytes.");
}
WindowsCredentialTypes.Credential cred = new WindowsCredentialTypes.Credential()
{
UserName = userName,
TargetName = targetName,
TargetAlias = null,
Persist = persist,
Comment = null,
Flags = 0,
Type = type,
CredentialBlob = password,
CredentialBlobSize = (UInt32)Encoding.Unicode.GetBytes(password).Length,
Attributes = null,
AttributeCount = 0
};
WindowsCredentialTypes.NativeCredential ncred = GetNativeCredential(cred);
// Write the info into the CredMan storage.
bool written = CredWrite(ref ncred, 0);
int lastError = Marshal.GetLastWin32Error();
Marshal.FreeCoTaskMem(ncred.TargetName);
Marshal.FreeCoTaskMem(ncred.CredentialBlob);
Marshal.FreeCoTaskMem(ncred.UserName);
if (written)
{
return(true);
}
else
{
string message = string.Format("CredWrite failed with the error code {0}.", lastError);
throw new Exception(message);
}
}
