internal bool ModalPromptDisplayDialog(ref NativeMethods.CredentialUiInfo credUiInfo,
ref NativeMethods.CredentialPackFlags authPackage,
IntPtr packedAuthBufferPtr,
uint packedAuthBufferSize,
IntPtr inBufferPtr,
int inBufferSize,
bool saveCredentials,
NativeMethods.CredentialUiWindowsFlags flags,
out string username,
out string password)
=> _modalPromptDisplayDialog(this,
ref credUiInfo,
ref authPackage,
packedAuthBufferPtr,
packedAuthBufferSize,
inBufferPtr,
inBufferSize,
saveCredentials,
flags,
out username,
out password);
public static Credential CredentialPrompt(Program program, TargetUri targetUri, string message)
{
Debug.Assert(targetUri != null);
Debug.Assert(message != null);
NativeMethods.CredentialUiInfo credUiInfo = new NativeMethods.CredentialUiInfo
{
BannerArt = IntPtr.Zero,
CaptionText = program.Title,
MessageText = message,
Parent = IntPtr.Zero,
Size = Marshal.SizeOf(typeof(NativeMethods.CredentialUiInfo))
};
NativeMethods.CredentialUiWindowsFlags flags = NativeMethods.CredentialUiWindowsFlags.Generic;
NativeMethods.CredentialPackFlags authPackage = NativeMethods.CredentialPackFlags.None;
IntPtr packedAuthBufferPtr = IntPtr.Zero;
IntPtr inBufferPtr = IntPtr.Zero;
uint packedAuthBufferSize = 0;
bool saveCredentials = false;
int inBufferSize = 0;
string username;
string password;
if (program.ModalPromptDisplayDialog(ref credUiInfo,
ref authPackage,
packedAuthBufferPtr,
packedAuthBufferSize,
inBufferPtr,
inBufferSize,
saveCredentials,
flags,
out username,
out password))
{
return(new Credential(username, password));
}
return(null);
}
public static bool DisplayModal(Program program,
ref NativeMethods.CredentialUiInfo credUiInfo,
ref NativeMethods.CredentialPackFlags authPackage,
IntPtr packedAuthBufferPtr,
uint packedAuthBufferSize,
IntPtr inBufferPtr,
int inBufferSize,
bool saveCredentials,
NativeMethods.CredentialUiWindowsFlags flags,
out string username,
out string password)
{
if (program is null)
{
throw new ArgumentNullException(nameof(program));
}
int error;
try
{
// open a standard Windows authentication dialog to acquire username + password credentials
if ((error = NativeMethods.CredUIPromptForWindowsCredentials(credInfo: ref credUiInfo,
authError: 0,
authPackage: ref authPackage,
inAuthBuffer: inBufferPtr,
inAuthBufferSize: (uint)inBufferSize,
outAuthBuffer: out packedAuthBufferPtr,
outAuthBufferSize: out packedAuthBufferSize,
saveCredentials: ref saveCredentials,
flags: flags)) != NativeMethods.Win32Error.Success)
{
program.Trace.WriteLine($"credential prompt failed ('{NativeMethods.Win32Error.GetText(error)}').");
username = null;
password = null;
return(false);
}
// use `StringBuilder` references instead of string so that they can be written to
var usernameBuffer = new StringBuilder(512);
var domainBuffer = new StringBuilder(256);
var passwordBuffer = new StringBuilder(512);
int usernameLen = usernameBuffer.Capacity;
int passwordLen = passwordBuffer.Capacity;
int domainLen = domainBuffer.Capacity;
// unpack the result into locally useful data
if (!NativeMethods.CredUnPackAuthenticationBuffer(flags: authPackage,
authBuffer: packedAuthBufferPtr,
authBufferSize: packedAuthBufferSize,
username: usernameBuffer,
maxUsernameLen: ref usernameLen,
domainName: domainBuffer,
maxDomainNameLen: ref domainLen,
password: passwordBuffer,
maxPasswordLen: ref passwordLen))
{
username = null;
password = null;
error = Marshal.GetLastWin32Error();
program.Trace.WriteLine($"failed to unpack buffer ('{NativeMethods.Win32Error.GetText(error)}').");
return(false);
}
program.Trace.WriteLine("successfully acquired credentials from user.");
username = usernameBuffer.ToString();
password = passwordBuffer.ToString();
return(true);
}
finally
{
if (packedAuthBufferPtr != IntPtr.Zero)
{
Marshal.FreeHGlobal(packedAuthBufferPtr);
}
}
}
public static Credential PasswordPrompt(Program program, TargetUri targetUri, string message, string username)
{
Debug.Assert(targetUri != null);
Debug.Assert(message != null);
Debug.Assert(username != null);
NativeMethods.CredentialUiInfo credUiInfo = new NativeMethods.CredentialUiInfo
{
BannerArt = IntPtr.Zero,
CaptionText = program.Title,
MessageText = message,
Parent = IntPtr.Zero,
Size = Marshal.SizeOf(typeof(NativeMethods.CredentialUiInfo))
};
NativeMethods.CredentialUiWindowsFlags flags = NativeMethods.CredentialUiWindowsFlags.Generic;
NativeMethods.CredentialPackFlags authPackage = NativeMethods.CredentialPackFlags.None;
IntPtr packedAuthBufferPtr = IntPtr.Zero;
IntPtr inBufferPtr = IntPtr.Zero;
uint packedAuthBufferSize = 0;
bool saveCredentials = false;
int inBufferSize = 0;
string password;
try
{
int error;
// execute with `null` to determine buffer size always returns false when determining
// size, only fail if `inBufferSize` looks bad
NativeMethods.CredPackAuthenticationBuffer(flags: authPackage,
username: username,
password: string.Empty,
packedCredentials: IntPtr.Zero,
packedCredentialsSize: ref inBufferSize);
if (inBufferSize <= 0)
{
error = Marshal.GetLastWin32Error();
Git.Trace.WriteLine($"unable to determine credential buffer size ('{NativeMethods.Win32Error.GetText(error)}').");
return(null);
}
inBufferPtr = Marshal.AllocHGlobal(inBufferSize);
if (!NativeMethods.CredPackAuthenticationBuffer(flags: authPackage,
username: username,
password: string.Empty,
packedCredentials: inBufferPtr,
packedCredentialsSize: ref inBufferSize))
{
error = Marshal.GetLastWin32Error();
Git.Trace.WriteLine($"unable to write to credential buffer ('{NativeMethods.Win32Error.GetText(error)}').");
return(null);
}
if (program.ModalPromptDisplayDialog(ref credUiInfo,
ref authPackage,
packedAuthBufferPtr,
packedAuthBufferSize,
inBufferPtr,
inBufferSize,
saveCredentials,
flags,
out username,
out password))
{
return(new Credential(username, password));
}
}
finally
{
if (inBufferPtr != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(inBufferPtr);
}
}
return(null);
}
