public static void WriteCredential(string applicationName, string userName, string secret, CredentialPersistence persistence)
{
WriteCredential(applicationName, userName, secret, comment: null, persistence);
}
/// <summary>
/// Constructor with type, persistance, and flags.
/// </summary>
/// <param name="userName"></param>
/// <param name="secret"></param>
/// <param name="target"></param>
/// <param name="type"></param>
/// <param name="persist"></param>
/// <param name="flags"></param>
public Credential(string userName, string secret, string target, CredentialType type, CredentialPersistence persist, CredentialFlags flags) : this(userName, secret, target, type, persist)
{
this.Flags = flags;
}
public static void WriteCredential(string applicationName, string userName, string secret, string?comment, CredentialPersistence persistence)
{
if (applicationName == null)
{
throw new ArgumentNullException(nameof(applicationName));
}
if (userName == null)
{
throw new ArgumentNullException(nameof(userName));
}
if (secret == null)
{
throw new ArgumentNullException(nameof(secret));
}
// CRED_MAX_CREDENTIAL_BLOB_SIZE
// XP and Vista: 512;
// 7 and above: 5*512
var secretLength = secret.Length * UnicodeEncoding.CharSize;
if (Environment.OSVersion.Version < new Version(6, 1) /* Windows 7 */)
{
if (secretLength > 512)
{
throw new ArgumentOutOfRangeException(nameof(secret), "The secret message has exceeded 512 bytes.");
}
}
else
{
if (secretLength > 2560)
{
throw new ArgumentOutOfRangeException(nameof(secret), "The secret message has exceeded 2560 bytes.");
}
}
if (comment != null)
{
// CRED_MAX_STRING_LENGTH 256
if (comment.Length > 255)
{
throw new ArgumentOutOfRangeException(nameof(comment), "The comment message has exceeded 256 characters.");
}
}
var commentPtr = IntPtr.Zero;
var targetNamePtr = IntPtr.Zero;
var credentialBlobPtr = IntPtr.Zero;
var userNamePtr = IntPtr.Zero;
try
{
commentPtr = comment != null?Marshal.StringToCoTaskMemUni(comment) : IntPtr.Zero;
targetNamePtr = Marshal.StringToCoTaskMemUni(applicationName);
credentialBlobPtr = Marshal.StringToCoTaskMemUni(secret);
userNamePtr = Marshal.StringToCoTaskMemUni(userName);
var credential = new CREDENTIAL
{
AttributeCount = 0,
Attributes = IntPtr.Zero,
Comment = commentPtr,
TargetAlias = IntPtr.Zero,
Type = CredentialType.Generic,
Persist = persistence,
CredentialBlobSize = (uint)secretLength,
TargetName = targetNamePtr,
CredentialBlob = credentialBlobPtr,
UserName = userNamePtr,
};
var written = Advapi32.CredWrite(ref credential, 0);
var lastError = Marshal.GetLastWin32Error();
if (!written)
{
throw new Win32Exception(lastError, $"CredWrite failed with the error code {lastError.ToString(CultureInfo.InvariantCulture)}.");
}
}
finally
{
FreeCoTaskMem(commentPtr);
FreeCoTaskMem(targetNamePtr);
FreeCoTaskMem(credentialBlobPtr);
FreeCoTaskMem(userNamePtr);
}
}
/// <summary>
/// Constructor with credential type and persistance.
/// </summary>
/// <param name="userName"></param>
/// <param name="secret"></param>
/// <param name="target"></param>
/// <param name="type"></param>
/// <param name="persist"></param>
public Credential(string userName, string secret, string target, CredentialType type, CredentialPersistence persist) : this(userName, secret, target, type)
{
this.Persist = persist;
}
