implements Samba support to close #82

src/Kp2aBusinessLogic/Io/SmbFileStorage.cs

@@ -0,0 +1,615 @@
+using System.Net;
+using Android.Content;
+using keepass2android;
+using keepass2android.Io;
+using KeePassLib.Serialization;
+using SMBLibrary.Client;
+using SMBLibrary;
+using FileAttributes = SMBLibrary.FileAttributes;
+using KeePassLib.Utility;
+using Java.Nio.FileNio;
+
+namespace Kp2aBusinessLogic.Io
+{
+    public class SmbFileStorage : IFileStorage
+    {
+        public IEnumerable<string> SupportedProtocols
+        {
+            get { yield return "smb"; }
+        }
+
+        public bool UserShouldBackup
+        {
+            get { return false; }
+        }
+
+        public void Delete(IOConnectionInfo ioc)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool CheckForFileChangeFast(IOConnectionInfo ioc, string previousFileVersion)
+        {
+            return false;
+        }
+
+        public string GetCurrentFileVersionFast(IOConnectionInfo ioc)
+        {
+            return null;
+        }
+
+        public struct SmbConnectionInfo
+        {
+            public string Host;
+            public string Username;
+            public string Password;
+            public string? Domain;
+            public string? Share;
+            public string? LocalPath;
+
+            public static SmbConnectionInfo FromUrlAndCredentials(string url, string username, string password, string? domain)
+            {
+                string userDomain = username;
+                if (domain != null)
+                {
+                    userDomain = domain + "\\" + username;
+                }
+                if (url.StartsWith("smb://"))
+                {
+                    url = url.Substring(6);
+                }
+
+                if (url.StartsWith("\\\\"))
+                {
+                    url = url.Substring(2);
+                }
+
+                url = url.Replace("\\", "/");
+            
+                string fullPath = "smb://" + WebUtility.UrlEncode(userDomain) + ":" + WebUtility.UrlEncode(password) + "@" + url;
+                return new SmbConnectionInfo(new IOConnectionInfo() { Path = fullPath} );
+            }
+
+
+            public SmbConnectionInfo(IOConnectionInfo ioc)
+            {
+                string fullpath = ioc.Path;
+                if (!fullpath.StartsWith("smb://"))
+                {
+                    throw new Exception("Invalid smb path!");
+                }
+
+                fullpath = fullpath.Substring(6);
+                string[] authAndPath = fullpath.Split('@');
+                if (authAndPath.Length != 2)
+                {
+                    throw new Exception("Invalid smb path!");
+                }
+
+                string[] userAndPwd = authAndPath[0].Split(':');
+                if (userAndPwd.Length != 2)
+                {
+                    throw new Exception("Invalid smb path!");
+                }
+
+                string[] pathParts = authAndPath[1].Split('/');
+                if (pathParts.Length < 1)
+                {
+                    throw new Exception("Invalid smb path!");
+                }
+
+                Host = pathParts[0];
+                if (pathParts.Length > 1)
+                {
+                    Share = pathParts[1];
+                }
+                LocalPath = String.Join("/", pathParts.Skip(2));
+                if (LocalPath.EndsWith("/"))
+                {
+                    LocalPath = LocalPath.Substring(0, LocalPath.Length - 1);
+                }
+            
+                Username = WebUtility.UrlDecode(userAndPwd[0]);
+                if (Username.Contains("\\"))
+                {
+                    string[] domainAndUser = Username.Split('\\');
+                    Domain = domainAndUser[0];
+                    Username = domainAndUser[1];
+                }
+                else Domain = null;
+
+                Password = WebUtility.UrlDecode(userAndPwd[1]);
+            }
+
+            public string ToPath()
+            {
+                string domainUser = Username;
+                if (Domain != null)
+                {
+                    domainUser = Domain + "\\" + Username;
+                }
+
+                return "smb://" + WebUtility.UrlEncode(domainUser) + ":" + WebUtility.UrlEncode(Password) + "@" + Host +
+                       "/" + Share + "/" + LocalPath;
+            }
+
+            public string GetPathWithoutCredentials()
+            {
+                return "smb://" + Host + "/" + Share + "/" + LocalPath;
+            }
+
+            public string GetLocalSmbPath()
+            {
+                return LocalPath?.Replace("/", "\\") ?? "";
+            }
+
+            public SmbConnectionInfo GetParent()
+            {
+                SmbConnectionInfo parent = new SmbConnectionInfo
+                {
+                    Host = Host,
+                    Username = Username,
+                    Password = Password,
+                    Domain = Domain,
+                    Share = Share
+                };
+                string[] pathParts = LocalPath?.Split('/') ?? [];
+                if (pathParts.Length > 0)
+                {
+                    parent.LocalPath = string.Join("/", pathParts.Take(pathParts.Length - 1));
+                }
+                else
+                {
+                    parent.LocalPath = "";
+                    parent.Share = "";
+                }
+
+                return parent;
+            }
+
+            public string Stem()
+            {
+                return LocalPath?.Split('/').Last() ?? "";
+            }
+
+
+            public SmbConnectionInfo GetChild(string childName)
+            {
+                SmbConnectionInfo child = new SmbConnectionInfo();
+                child.Host = Host;
+                child.Username = Username;
+                child.Password = Password;
+                child.Domain = Domain;
+                if (string.IsNullOrEmpty(Share))
+                {
+                    child.Share = childName;
+                }
+                else
+                {
+
+                    child.Share = Share;
+                    var pathPartsList = LocalPath?.Split('/').Where(p => !string.IsNullOrEmpty(p)).ToList() ?? [];
+                    pathPartsList.Add(childName);
+                    child.LocalPath = string.Join("/", pathPartsList);
+                }
+
+                return child;
+            }
+
+            public string ToDisplayString()
+            {
+                return "smb://" + Host + "/" + Share + "/" + LocalPath;
+
+            }
+        }
+
+
+        class SmbConnection: IDisposable
+        {
+            public SmbConnection(SmbConnectionInfo info)
+            {
+                _isLoggedIn = false;
+                var isConnected = Client.Connect(info.Host, SMBTransportType.DirectTCPTransport);
+                if (!isConnected)
+                {
+                    throw new Exception($"Failed to connect to SMB server {info.Host}");
+                }
+
+                var status = Client.Login(info.Domain ?? string.Empty, info.Username, info.Password);
+                if (status != NTStatus.STATUS_SUCCESS)
+                {
+                    throw new Exception($"Failed to login to SMB as {info.Username}");
+                }
+
+                _isLoggedIn = true;
+
+                if (!string.IsNullOrEmpty(info.Share))
+                {
+                    FileStore = Client.TreeConnect(info.Share, out status);
+                }
+                
+            }
+
+
+
+            public readonly SMB2Client Client = new SMB2Client();
+
+
+            public readonly ISMBFileStore? FileStore;
+            private readonly bool _isLoggedIn;
+
+            public void Dispose()
+            {
+                FileStore?.Disconnect();
+                
+                if (_isLoggedIn)
+                    Client.Logoff();
+
+                if (!Client.IsConnected) return;
+                Client.Disconnect();
+
+
+            }
+        }
+    
+
+
+    public Stream OpenFileForRead(IOConnectionInfo ioc)
+        {
+
+            SmbConnectionInfo info = new SmbConnectionInfo(ioc);
+            using SmbConnection conn = new SmbConnection(info);
+
+            if (conn.FileStore == null)
+            {
+                throw new Exception($"Failed to read to {info.GetPathWithoutCredentials()}");
+            }
+
+
+            NTStatus status = conn.FileStore.CreateFile(out var fileHandle, out _, info.GetLocalSmbPath(),
+                AccessMask.GENERIC_READ | AccessMask.SYNCHRONIZE, FileAttributes.Normal, ShareAccess.Read,
+                CreateDisposition.FILE_OPEN,
+                CreateOptions.FILE_NON_DIRECTORY_FILE | CreateOptions.FILE_SYNCHRONOUS_IO_ALERT, null);
+
+            if (status != NTStatus.STATUS_SUCCESS)
+            {
+                throw new Exception($"Failed to open file {info.LocalPath}");
+            }
+
+            var stream = new MemoryStream();
+            long bytesRead = 0;
+            while (true)
+            {
+                status = conn.FileStore.ReadFile(out var data, fileHandle, bytesRead, (int)conn.Client.MaxReadSize);
+                if (status != NTStatus.STATUS_SUCCESS && status != NTStatus.STATUS_END_OF_FILE)
+                {
+                    throw new Exception("Failed to read from file");
+                }
+
+                if (status == NTStatus.STATUS_END_OF_FILE || data.Length == 0)
+                {
+                    break;
+                }
+
+                bytesRead += data.Length;
+                stream.Write(data, 0, data.Length);
+            }
+
+            stream.Seek(0, SeekOrigin.Begin);
+            return stream;
+        }
+
+
+        class SmbFileStorageWriteTransaction : IWriteTransaction
+        {
+            private bool UseFileTransaction { get; }
+            private readonly string _path;
+            private readonly string _uploadPath;
+            private readonly SmbFileStorage _fileStorage;
+            private MemoryStream? _memoryStream;
+
+            public SmbFileStorageWriteTransaction(string path, SmbFileStorage fileStorage, bool useFileTransaction)
+            {
+                UseFileTransaction = useFileTransaction;
+                _path = path;
+                if (useFileTransaction)
+                {
+                    _uploadPath = _path + Guid.NewGuid().ToString().Substring(0, 8) + ".tmp";
+                }
+                else
+                {
+                    _uploadPath = _path;
+                }
+                
+
+                _fileStorage = fileStorage;
+                _memoryStream = null;
+            }
+
+            public void Dispose()
+            {
+                _memoryStream?.Dispose();
+            }
+
+            public Stream OpenFile()
+            {
+                _memoryStream = new MemoryStream();
+                return _memoryStream;
+            }
+
+            public void CommitWrite()
+            {
+                _fileStorage.UploadData(new MemoryStream(_memoryStream!.ToArray()), new SmbConnectionInfo(new IOConnectionInfo() { Path = _uploadPath}));
+                if (UseFileTransaction)
+                {
+                    SmbConnectionInfo uploadPath = new SmbConnectionInfo(new IOConnectionInfo() { Path = _uploadPath });
+                    SmbConnectionInfo finalPath = new SmbConnectionInfo(new IOConnectionInfo() { Path = _path });
+                    _fileStorage.RenameFile(uploadPath, finalPath);
+                }
+
+
+            }
+        }
+
+        private void RenameFile(SmbConnectionInfo fromPath, SmbConnectionInfo toPath)
+        {
+            using var connection = new SmbConnection(fromPath);
+
+            // Open existing file
+            var status = connection.FileStore!.CreateFile(out var handle, out _, fromPath.GetLocalSmbPath(), AccessMask.MAXIMUM_ALLOWED, 0, ShareAccess.Read, CreateDisposition.FILE_OPEN, CreateOptions.FILE_NON_DIRECTORY_FILE, null);
+            if (status != NTStatus.STATUS_SUCCESS)
+                throw new Exception($"Failed to open {fromPath.LocalPath} for renaming!");
+        
+            FileRenameInformationType2 renameInfo = new FileRenameInformationType2
+            {
+                FileName = toPath.GetLocalSmbPath(),
+                ReplaceIfExists = true
+            };
+            connection.FileStore.SetFileInformation(handle, renameInfo);
+            connection.FileStore.CloseFile(handle);
+            
+        }
+
+        private void UploadData(Stream data, SmbConnectionInfo uploadPath)
+        {
+            using var connection = new SmbConnection(uploadPath);
+            var status = connection.FileStore!.CreateFile(out var fileHandle, out _, uploadPath.GetLocalSmbPath(), AccessMask.GENERIC_WRITE | AccessMask.SYNCHRONIZE, FileAttributes.Normal, ShareAccess.None, CreateDisposition.FILE_CREATE, CreateOptions.FILE_NON_DIRECTORY_FILE | CreateOptions.FILE_SYNCHRONOUS_IO_ALERT, null);
+            if (status == NTStatus.STATUS_OBJECT_NAME_COLLISION)
+                status = connection.FileStore!.CreateFile(out fileHandle, out _, uploadPath.GetLocalSmbPath(), AccessMask.GENERIC_WRITE | AccessMask.SYNCHRONIZE, FileAttributes.Normal, ShareAccess.None, CreateDisposition.FILE_OVERWRITE, CreateOptions.FILE_NON_DIRECTORY_FILE | CreateOptions.FILE_SYNCHRONOUS_IO_ALERT, null);
+            if (status != NTStatus.STATUS_SUCCESS)
+            {
+                throw new Exception($"Failed to open {uploadPath.LocalPath} for writing!");
+            }
+
+            long writeOffset = 0;
+            while (data.Position < data.Length)
+            {
+                byte[] buffer = new byte[(int)connection.Client.MaxWriteSize];
+                int bytesRead = data.Read(buffer, 0, buffer.Length);
+                if (bytesRead < (int)connection.Client.MaxWriteSize)
+                {
+                    Array.Resize(ref buffer, bytesRead);
+                }
+
+                status = connection.FileStore.WriteFile(out _, fileHandle, writeOffset, buffer);
+                if (status != NTStatus.STATUS_SUCCESS)
+                {
+                    throw new Exception("Failed to write to file");
+                }
+                writeOffset += bytesRead;
+            }
+
+        }
+
+        public IWriteTransaction OpenWriteTransaction(IOConnectionInfo ioc, bool useFileTransaction)
+        {
+            return new SmbFileStorageWriteTransaction(ioc.Path, this, useFileTransaction);
+        }
+
+        public string GetFilenameWithoutPathAndExt(IOConnectionInfo ioc)
+        {
+            return UrlUtil.StripExtension(
+                UrlUtil.GetFileName(ioc.Path));
+
+        }
+
+        public string GetFileExtension(IOConnectionInfo ioc)
+        {
+            return UrlUtil.GetExtension(ioc.Path);
+        }
+
+        public bool RequiresCredentials(IOConnectionInfo ioc)
+        {
+            return false;
+        }
+
+        public void CreateDirectory(IOConnectionInfo ioc, string newDirName)
+        {
+            throw new NotImplementedException();
+        }
+
+        private static IEnumerable<FileDescription> ListShares(SmbConnection conn, SmbConnectionInfo parent)
+        {
+            foreach (string share in conn.Client.ListShares(out _))
+            {
+                yield return new FileDescription()
+                {
+                    CanRead = true,
+                    CanWrite = true,
+                    DisplayName = share,
+                    IsDirectory = true,
+                    Path = parent.GetChild(share).ToPath()
+                };
+            }
+
+        }
+
+        public IEnumerable<FileDescription> ListContents(IOConnectionInfo ioc)
+        {
+            List<FileDescription> result = [];
+            SmbConnectionInfo info = new SmbConnectionInfo(ioc);
+            using SmbConnection conn = new SmbConnection(info);
+            if (string.IsNullOrEmpty(info.Share))
+            {
+                var shares = ListShares(conn, info).ToList();
+                return shares;
+            }
+
+            NTStatus status = conn.FileStore!.CreateFile(out var directoryHandle, out _, info.GetLocalSmbPath(), AccessMask.GENERIC_READ, FileAttributes.Directory, ShareAccess.Read | ShareAccess.Write, CreateDisposition.FILE_OPEN, CreateOptions.FILE_DIRECTORY_FILE, null);
+            if (status == NTStatus.STATUS_SUCCESS)
+            {
+                conn.FileStore.QueryDirectory(out List<QueryDirectoryFileInformation> fileList, directoryHandle, "*", FileInformationClass.FileDirectoryInformation);
+                foreach (var fi in fileList)
+                {
+                    var fileDirectoryInformation = fi as FileDirectoryInformation;
+                    if (fileDirectoryInformation == null)
+                        continue;
+
+                    if (fileDirectoryInformation.FileName is "." or "..")
+                        continue;
+
+                    var fileDescription = FileDescriptionConvert(ioc, fileDirectoryInformation);
+
+                    result.Add(fileDescription);
+                }
+                conn.FileStore.CloseFile(directoryHandle);
+            }
+
+            return result;
+        }
+
+        private FileDescription FileDescriptionConvert(IOConnectionInfo parentIoc,
+            FileDirectoryInformation fileDirectoryInformation)
+        {
+            FileDescription fileDescription = new FileDescription
+            {
+                CanRead = true,
+                CanWrite = true,
+                IsDirectory = (fileDirectoryInformation.FileAttributes & FileAttributes.Directory) != 0,
+                DisplayName = fileDirectoryInformation.FileName
+            };
+            fileDescription.Path = CreateFilePath(parentIoc.Path, fileDescription.DisplayName);
+            fileDescription.LastModified = fileDirectoryInformation.LastWriteTime;
+                        
+            fileDescription.SizeInBytes = fileDirectoryInformation.EndOfFile;
+            return fileDescription;
+        }
+
+        public FileDescription GetFileDescription(IOConnectionInfo ioc)
+        {
+            SmbConnectionInfo info = new SmbConnectionInfo(ioc);
+
+            if (string.IsNullOrEmpty(info.Share))
+            {
+                return new FileDescription
+                {
+                    CanRead = true, CanWrite = true,
+                    DisplayName = info.Host,
+                    IsDirectory = true,
+                    Path = info.ToPath()
+                };
+            }
+
+            using SmbConnection conn = new SmbConnection(info);
+            NTStatus status = conn.FileStore!.CreateFile(out var directoryHandle, out _, info.GetParent().GetLocalSmbPath(), AccessMask.GENERIC_READ, FileAttributes.Directory, ShareAccess.Read | ShareAccess.Write, CreateDisposition.FILE_OPEN, CreateOptions.FILE_DIRECTORY_FILE, null);
+            if (status != NTStatus.STATUS_SUCCESS) throw new Exception($"Failed to query details for {info.LocalPath}");
+            conn.FileStore.QueryDirectory(out List<QueryDirectoryFileInformation> fileList, directoryHandle, info.Stem(), FileInformationClass.FileDirectoryInformation);
+            foreach (var fi in fileList)
+            {
+                var fileDirectoryInformation = fi as FileDirectoryInformation;
+                if (fileDirectoryInformation == null)
+                    continue;
+
+                if (fileDirectoryInformation.FileName is "." or "..")
+                    continue;
+
+                return FileDescriptionConvert(ioc, fileDirectoryInformation);
+
+                        
+            }
+            conn.FileStore.CloseFile(directoryHandle);
+
+            throw new Exception($"Failed to query details for {info.LocalPath}");
+        }
+
+        public bool RequiresSetup(IOConnectionInfo ioConnection)
+        {
+            return false;
+        }
+
+        public string IocToPath(IOConnectionInfo ioc)
+        {
+            return ioc.Path;
+        }
+
+        public void StartSelectFile(IFileStorageSetupInitiatorActivity activity, bool isForSave, int requestCode, string protocolId)
+        {
+            activity.PerformManualFileSelect(isForSave, requestCode, protocolId);
+
+        }
+
+        public void PrepareFileUsage(IFileStorageSetupInitiatorActivity activity, IOConnectionInfo ioc, int requestCode,
+            bool alwaysReturnSuccess)
+        {
+            Intent intent = new Intent();
+            activity.IocToIntent(intent, ioc);
+            activity.OnImmediateResult(requestCode, (int)FileStorageResults.FileUsagePrepared, intent);
+        }
+
+        public void PrepareFileUsage(Context ctx, IOConnectionInfo ioc)
+        {
+            
+        }
+
+        public void OnCreate(IFileStorageSetupActivity activity, Bundle savedInstanceState)
+        {
+            
+        }
+
+        public void OnResume(IFileStorageSetupActivity activity)
+        {
+            
+        }
+
+        public void OnStart(IFileStorageSetupActivity activity)
+        {
+            
+        }
+
+        public void OnActivityResult(IFileStorageSetupActivity activity, int requestCode, int resultCode, Intent data)
+        {
+            
+        }
+
+        public string GetDisplayName(IOConnectionInfo ioc)
+        {
+            return new SmbConnectionInfo(ioc).ToDisplayString();
+        }
+
+        public string CreateFilePath(string parent, string newFilename)
+        {
+            return new SmbConnectionInfo(new IOConnectionInfo() { Path = parent}).GetChild(newFilename).ToPath();
+        }
+
+        public IOConnectionInfo GetParentPath(IOConnectionInfo ioc)
+        {
+            SmbConnectionInfo connectionInfo = new SmbConnectionInfo(ioc);
+            return new IOConnectionInfo() { Path = connectionInfo.GetParent().ToPath() };
+        }
+
+        public IOConnectionInfo GetFilePath(IOConnectionInfo folderPath, string filename)
+        {
+            return new IOConnectionInfo() { Path = CreateFilePath(folderPath.Path, filename)};
+        }
+
+        public bool IsPermanentLocation(IOConnectionInfo ioc)
+        {
+            return true;
+        }
+
+        public bool IsReadOnly(IOConnectionInfo ioc, OptionalOut<UiStringKey> reason = null)
+        {
+            return false;
+        }
+    }
+}

src/Kp2aBusinessLogic/Kp2aBusinessLogic.csproj

@@ -13,6 +13,7 @@
     <PackageReference Include="MegaApiClient" Version="1.10.4" />
     <PackageReference Include="Microsoft.Graph" Version="5.68.0" />
     <PackageReference Include="Microsoft.Identity.Client" Version="4.67.1" />
+    <PackageReference Include="SMBLibrary" Version="1.5.4" />
     <PackageReference Include="Xamarin.AndroidX.Browser" Version="1.8.0" />
     <PackageReference Include="Xamarin.AndroidX.Core" Version="1.13.1.5" />
     <PackageReference Include="Xamarin.Google.Android.Material" Version="1.11.0.3" />

src/keepass2android-app/FileSelectHelper.cs

@@ -22,6 +22,7 @@ using Keepass2android.Javafilestorage;
 #endif
 using KeePassLib.Serialization;
 using KeePassLib.Utility;
+using static Kp2aBusinessLogic.Io.SmbFileStorage;
 
 namespace keepass2android
 {
@@ -350,7 +351,47 @@ namespace keepass2android
 #endif
 		}
 
-		private void ShowFtpDialog(Activity activity, Util.FileSelectedHandler onStartBrowse, Action onCancel, string defaultPath)
+
+        private void ShowSmbDialog(Activity activity, Util.FileSelectedHandler onStartBrowse, Action onCancel, string defaultPath)
+        {
+#if !EXCLUDE_JAVAFILESTORAGE && !NoNet
+            MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(activity);
+            View dlgContents = activity.LayoutInflater.Inflate(Resource.Layout.smbcredentials, null);
+            if (!defaultPath.EndsWith(_schemeSeparator))
+            {
+                SmbConnectionInfo ci = new SmbConnectionInfo(new IOConnectionInfo() { Path = defaultPath });
+                
+                dlgContents.FindViewById<EditText>(Resource.Id.smb_url).Text = ci.GetPathWithoutCredentials();
+                dlgContents.FindViewById<EditText>(Resource.Id.smb_domain).Text = ci.Domain;
+                dlgContents.FindViewById<EditText>(Resource.Id.smb_user).Text = ci.Username;
+                dlgContents.FindViewById<EditText>(Resource.Id.smb_password).Text = ci.Password;
+
+
+            }
+            builder.SetView(dlgContents);
+            builder.SetPositiveButton(Android.Resource.String.Ok,
+                                      (sender, args) =>
+                                      {
+                                          string url = dlgContents.FindViewById<EditText>(Resource.Id.smb_url).Text;
+
+                                          string user = dlgContents.FindViewById<EditText>(Resource.Id.smb_user).Text;
+                                          string password = dlgContents.FindViewById<EditText>(Resource.Id.smb_password).Text;
+                                          string domain = dlgContents.FindViewById<EditText>(Resource.Id.smb_domain).Text;
+
+                                          string fullPath = SmbConnectionInfo.FromUrlAndCredentials(url, user, password, domain).ToPath();
+                                          onStartBrowse(fullPath);
+                                      });
+            EventHandler<DialogClickEventArgs> evtH = new EventHandler<DialogClickEventArgs>((sender, e) => onCancel());
+
+            builder.SetNegativeButton(Android.Resource.String.Cancel, evtH);
+            builder.SetTitle(activity.GetString(Resource.String.enter_smb_login_title));
+            Dialog dialog = builder.Create();
+
+            dialog.Show();
+#endif
+        }
+
+        private void ShowFtpDialog(Activity activity, Util.FileSelectedHandler onStartBrowse, Action onCancel, string defaultPath)
 		{
 #if !NoNet
 			MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(activity);
@@ -476,7 +517,9 @@ namespace keepass2android
 				ShowFtpDialog(_activity, ReturnFileOrStartFileChooser, ReturnCancel, defaultPath);
 			else if ((defaultPath.StartsWith("http://")) || (defaultPath.StartsWith("https://")))
 				ShowHttpDialog(_activity, ReturnFileOrStartFileChooser, ReturnCancel, defaultPath);
-			else if (defaultPath.StartsWith("owncloud://"))
+            else if ((defaultPath.StartsWith("smb://")))
+                ShowSmbDialog(_activity, ReturnFileOrStartFileChooser, ReturnCancel, defaultPath);
+            else if (defaultPath.StartsWith("owncloud://"))
 				ShowOwncloudDialog(_activity, ReturnFileOrStartFileChooser, ReturnCancel, defaultPath, "owncloud");
 			else if (defaultPath.StartsWith("nextcloud://"))
 			    ShowOwncloudDialog(_activity, ReturnFileOrStartFileChooser, ReturnCancel, defaultPath, "nextcloud");

src/keepass2android-app/Resources/layout/smbcredentials.axml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="fill_parent"
+    android:layout_height="wrap_content"
+    android:layout_margin="12dip"
+    >
+  <LinearLayout
+    android:orientation="horizontal"
+    android:layout_width="fill_parent"
+    android:layout_height="wrap_content">
+
+    <EditText
+            android:id="@+id/smb_url"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:singleLine="true"
+			android:layout_weight="1"
+            android:text=""
+      android:inputType="textWebEmailAddress"
+			android:hint="@string/hint_smb_url" />
+   
+  </LinearLayout>
+  <EditText
+    android:id="@+id/smb_domain"
+    android:layout_width="fill_parent"
+    android:layout_height="wrap_content"
+    android:singleLine="true"
+    android:text=""
+    android:hint="@string/hint_smb_domain" />
+  <EditText
+             android:id="@+id/smb_user"
+             android:layout_width="fill_parent"
+             android:layout_height="wrap_content"
+             android:singleLine="true"
+             android:text=""
+             android:hint="@string/hint_smb_username" />
+
+  <EditText
+            android:id="@+id/smb_password"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:inputType="textPassword"
+            android:singleLine="true"
+            android:text=""
+            android:hint="@string/hint_pass"
+    android:importantForAccessibility="no"/>
+
+
+
+</LinearLayout>

src/keepass2android-app/Resources/values/strings.xml

@@ -504,7 +504,12 @@
   <string name="ok_donate">Tell me more!</string>
   <string name="no_thanks">No, I don\'t like it that much</string>
   <string name="enter_http_login_title">Enter WebDav login data:</string>
+  <string name="enter_smb_login_title">Enter Samba login data:</string>
   <string name="hint_http_url">URL of folder or file (ex: mycloud.me.com/webdav/)</string>
+  <string name="hint_smb_url">URL of folder or file (ex: 192.168.1.10/share/folder/)</string>
+  <string name="hint_smb_domain">Samba user\'s domain</string>
+  <string name="hint_smb_username">Samba username</string>
+  
   <string name="enter_owncloud_login_title">Enter OwnCloud login data:</string>
   <string name="hint_owncloud_url">OwnCloud URL (ex: owncloud.me.com)</string>
   <string name="enter_nextcloud_login_title">Enter Nextcloud login data:</string>
@@ -542,6 +547,7 @@
   <string name="filestoragename_ftp">FTP</string>
   <string name="filestoragename_http">HTTP (WebDav)</string>
   <string name="filestoragename_https">HTTPS (WebDav)</string>
+  <string name="filestoragename_smb">Samba (Windows Share)</string>
   <string name="filestoragename_owncloud">OwnCloud</string>
   <string name="filestoragename_nextcloud">Nextcloud</string>
   <string name="filestoragename_dropbox">Dropbox</string>

src/keepass2android-app/app/App.cs

@@ -45,6 +45,7 @@ using keepass2android.database.edit;
 using keepass2android;
 using KeePassLib.Interfaces;
 using KeePassLib.Utility;
+using Kp2aBusinessLogic.Io;
 #if !NoNet
 #if !EXCLUDE_JAVAFILESTORAGE
 using Android.Gms.Common;
@@ -836,7 +837,8 @@ namespace keepass2android
                             new SftpFileStorage(LocaleManager.LocalizedAppContext, this, IsFtpDebugEnabled()),
 							new NetFtpFileStorage(LocaleManager.LocalizedAppContext, this, IsFtpDebugEnabled),
 							new WebDavFileStorage(this),
-							new PCloudFileStorage(LocaleManager.LocalizedAppContext, this),
+                            new SmbFileStorage(),
+                            new PCloudFileStorage(LocaleManager.LocalizedAppContext, this),
                             new PCloudFileStorageAll(LocaleManager.LocalizedAppContext, this),
                             new MegaFileStorage(App.Context),
 							//new LegacyWebDavStorage(this),