CredentialManagement.cs
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// Copyright (c) 2014, Joel Bennett
// Licensed under MIT license using System; using System.ComponentModel; using System.Runtime.InteropServices; using System.Text; using Microsoft.Win32.SafeHandles; using FILETIME = System.Runtime.InteropServices.ComTypes.FILETIME; namespace CredentialManagement { using System.Management.Automation; using System.Security; public enum CredentialType : uint { None = 0, Generic = 1, DomainPassword = 2, DomainCertificate = 3, DomainVisiblePassword = 4, GenericCertificate = 5, DomainExtended = 6, Maximum = 7, MaximumEx = 1007 } public enum PersistanceType : uint { Session = 1, LocalComputer = 2, Enterprise = 3 } public static class SecureStringHelper { // Methods public static SecureString CreateSecureString(string plainString) { var result = new SecureString(); if (!string.IsNullOrEmpty(plainString)) { foreach (var c in plainString.ToCharArray()) { result.AppendChar(c); } } result.MakeReadOnly(); return result; } public static SecureString CreateSecureString(IntPtr ptrToString, int length = 0) { string password = length > 0 ? Marshal.PtrToStringUni(ptrToString, length) : Marshal.PtrToStringUni(ptrToString); return CreateSecureString(password); } public static string CreateString(SecureString secureString) { string str; IntPtr zero = IntPtr.Zero; if ((secureString == null) || (secureString.Length == 0)) { return string.Empty; } try { zero = Marshal.SecureStringToBSTR(secureString); str = Marshal.PtrToStringBSTR(zero); } finally { if (zero != IntPtr.Zero) { Marshal.ZeroFreeBSTR(zero); } } return str; } } public static class IntPtrHelpers { public static IntPtr Increment(this IntPtr ptr, int cbSize) { return new IntPtr(ptr.ToInt64() + cbSize); } public static IntPtr Increment<T>(this IntPtr ptr) { return ptr.Increment(Marshal.SizeOf(typeof(T))); } public static T ElementAt<T>(this IntPtr ptr, int index) { var offset = Marshal.SizeOf(typeof(T))*index; var offsetPtr = ptr.Increment(offset); return (T)Marshal.PtrToStructure(offsetPtr, typeof(T)); } } public static class Store { private static string FixTarget(string target) { if (!target.Contains(":")) { if (target.Contains("=")) { target = "MicrosoftPowerShell:" + target; } else { target = "MicrosoftPowerShell:user=" + target; } } return target; } public static PSObject[] Find(string filter = "") { uint count = 0; int Flag = 0; IntPtr credentialArray = IntPtr.Zero; PSObject[] output = null; if(string.IsNullOrEmpty(filter)) { filter = null; Flag = 1; } NativeMethods.PSCredentialMarshaler helper = new NativeMethods.PSCredentialMarshaler(); if(NativeMethods.CredEnumerate(filter, Flag, out count, out credentialArray)) { IntPtr cred = IntPtr.Zero; output = new PSObject[count]; for (int n = 0; n < count; n++) { cred = credentialArray.ElementAt<IntPtr>(n); output[n] = (PSObject)helper.MarshalNativeToManaged(cred); } helper.CleanUpNativeData(credentialArray); } else { throw new Win32Exception(Marshal.GetLastWin32Error()); } return output; } public static void Save(PSObject credential) { var cred = credential.BaseObject as PSCredential; if (cred == null) { throw new ArgumentException("Credential object does not contain a PSCredential", "credential"); } if (!NativeMethods.CredWrite(credential, 0)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } } public static void Delete(string target, CredentialType type = CredentialType.Generic, bool fix = true) { if(fix) { target = FixTarget(target); } if (!NativeMethods.CredDelete(target, type, 0)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } } public static void Get(string target, bool fix = true) { if(fix) { target = FixTarget(target); } PSObject cred; if (!NativeMethods.CredFindBestCredential(target, CredentialType.Generic, 0, out cred)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } } public static PSObject Load(string target, CredentialType type = CredentialType.Generic, bool fix = true) { PSObject cred; if(fix) { target = FixTarget(target); } if(!NativeMethods.CredRead(target, type, 0, out cred)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } return cred; } } public class NativeMethods { public enum CREDErrorCodes { NO_ERROR = 0, ERROR_NOT_FOUND = 1168, ERROR_NO_SUCH_LOGON_SESSION = 1312, ERROR_INVALID_PARAMETER = 87, ERROR_INVALID_FLAGS = 1004, ERROR_BAD_USERNAME = 2202, SCARD_E_NO_READERS_AVAILABLE = (int)(0x8010002E - 0x100000000), SCARD_E_NO_SMARTCARD = (int)(0x8010000C - 0x100000000), SCARD_W_REMOVED_CARD = (int)(0x80100069 - 0x100000000), SCARD_W_WRONG_CHV = (int)(0x8010006B - 0x100000000) } [DllImport("Advapi32.dll", EntryPoint = "CredReadW", CharSet = CharSet.Unicode, SetLastError = true)] public static extern bool CredRead(string target, CredentialType type, int reservedFlag, [MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(PSCredentialMarshaler))] out PSObject credentialout); [DllImport("Advapi32.dll", EntryPoint = "CredWriteW", CharSet = CharSet.Unicode, SetLastError = true)] public static extern bool CredWrite([In] [MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(PSCredentialMarshaler))] PSObject userCredential, [In] UInt32 flags); [DllImport("advapi32.dll", EntryPoint = "CredDeleteW", CharSet = CharSet.Unicode, SetLastError = true)] public static extern bool CredDelete(string target, CredentialType type, int flags); [DllImport("Advapi32.dll", EntryPoint = "CredFree", SetLastError = true)] public static extern bool CredFree([In] IntPtr cred); [DllImport("advapi32.dll", EntryPoint = "CredEnumerateW", CharSet = CharSet.Unicode, SetLastError = true)] public static extern bool CredEnumerate(string filter, int flag, out uint count, out IntPtr pCredentials); [DllImport("advapi32.dll", EntryPoint = "CredFindBestCredentialW", CharSet = CharSet.Unicode, SetLastError = true)] public static extern bool CredFindBestCredential(string target, CredentialType type, int reservedFlag, [MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(PSCredentialMarshaler))] out PSObject credentialout); [DllImport("ole32.dll")] public static extern void CoTaskMemFree(IntPtr ptr); public class PSCredentialMarshaler : ICustomMarshaler { [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] private class NATIVECREDENTIAL { public UInt32 Flags; public CredentialType Type = CredentialType.Generic; public string TargetName; public string Comment; public FILETIME LastWritten; public UInt32 CredentialBlobSize; public IntPtr CredentialBlob; public PersistanceType Persist = PersistanceType.Enterprise; public UInt32 AttributeCount; public IntPtr Attributes; public string TargetAlias; public string UserName; } public void CleanUpManagedData(object ManagedObj) { // Nothing to do since all data can be garbage collected. } public void CleanUpNativeData(IntPtr pNativeData) { if (pNativeData == IntPtr.Zero) { return; } CredFree(pNativeData); } public int GetNativeDataSize() { return Marshal.SizeOf(typeof(NATIVECREDENTIAL)); } public IntPtr MarshalManagedToNative(object obj) { PSCredential credential; PSObject credo = obj as PSObject; if (credo != null) { credential = credo.BaseObject as PSCredential; } else { credential = obj as PSCredential; } if (credential == null) { Console.WriteLine("Error: Can't convert!"); return IntPtr.Zero; } var nCred = new NATIVECREDENTIAL() { UserName = credential.UserName, CredentialBlob = Marshal.SecureStringToCoTaskMemUnicode(credential.Password), CredentialBlobSize = (uint)credential.Password.Length * 2, TargetName = "MicrosoftPowerShell:user=" + credential.UserName, Type = CredentialType.Generic, Persist = PersistanceType.Enterprise }; if (credo != null) { foreach (var m in credo.Members) { switch (m.Name) { case "Target": if (m.Value != null) nCred.TargetName = m.Value.ToString(); break; case "TargetAlias": if (m.Value != null) nCred.TargetAlias = m.Value.ToString(); break; case "Type": if (m.Value != null) nCred.Type = (CredentialType)m.Value; break; case "Persistence": if (m.Value != null) nCred.Persist = (PersistanceType)m.Value; break; case "Description": if (m.Value != null) nCred.Comment = m.Value.ToString(); break; case "LastWriteTime": // ignored break; } } } IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(nCred)); Marshal.StructureToPtr(nCred, ptr, false); return ptr; } public object MarshalNativeToManaged(IntPtr pNativeData) { if (pNativeData == IntPtr.Zero) { return null; } var ncred = (NATIVECREDENTIAL)Marshal.PtrToStructure(pNativeData, typeof(NATIVECREDENTIAL)); var securePass = (ncred.CredentialBlob == IntPtr.Zero) ? new SecureString() : SecureStringHelper.CreateSecureString(ncred.CredentialBlob, (int)(ncred.CredentialBlobSize)/2); var credEx = new PSObject(new PSCredential(ncred.UserName ?? "-", securePass)); credEx.Members.Add(new PSNoteProperty("Target", ncred.TargetName)); credEx.Members.Add(new PSNoteProperty("TargetAlias", ncred.TargetAlias)); credEx.Members.Add(new PSNoteProperty("Type", (CredentialType)ncred.Type)); credEx.Members.Add(new PSNoteProperty("Persistence", (PersistanceType)ncred.Persist)); credEx.Members.Add(new PSNoteProperty("Description", ncred.Comment)); credEx.Members.Add(new PSNoteProperty("LastWriteTime", DateTime.FromFileTime((((long)ncred.LastWritten.dwHighDateTime) << 32) + ncred.LastWritten.dwLowDateTime))); return credEx; } public static ICustomMarshaler GetInstance(string cookie) { return new PSCredentialMarshaler(); } } } } |