SFTPServer Component

Properties   Methods   Events   Config Settings   Errors  

The SFTPServer component provides server-side functionality for SFTP connections.

Syntax

nsoftware.SecureBlackbox.SFTPServer

Remarks

SFTPServer is an implementation for SSH File Transfer Protocol server. It works over a secure SSH channel, and should not be confused with the FTP/FTPS protocol.

Property List


The following is the full list of the properties of the component with short descriptions. Click on the links for further details.

ActiveSpecifies whether the SFTP server has started and ready to accept connections.
AuthTypesDefines allowed authentication types.
BaseDirSpecifies the server's base (root) directory.
CapabilitiesSpecifies which elements of the SSH ecosystem the component must support/enable.
ClientFileEntryA container for file entry details.
CompressionLevelSpecifies the preferable compression level
ExternalCryptoProvides access to external signing and DC parameters.
FIPSModeReserved.
ForceCompressionThis property specifies whether server explicitly requires data compression.
HostSpecifies server's host name.
KeyContains client's public key.
MaxSFTPVersionMaximum SFTP version supported.
MinSFTPVersionMinimum SFTP version supported.
PinnedClientPopulates the pinned client details.
PortSpecifies the listening port number.
ReadOnlySpecifies whether files on the server are read-only.
ServerKeysThe server's SSH keys.
SocketSettingsManages network connection settings.
SSHSettingsThe SSH connection settings.
UsersA collection of known users.
UseUTF8Specifies whether UTF8 conversion is to be used when parsing file names.

Method List


The following is the full list of the methods of the component with short descriptions. Click on the links for further details.

CleanupCleans up the server environment by purging expired sessions and cleaning caches.
ConfigSets or retrieves a configuration setting.
DoActionPerforms an additional action.
DropClientTerminates a client connection.
GetClientBufferAcquires a piece of operation data.
GetClientFileEntryAcquires file entry details from the component.
ListClientsEnumerates the connected clients.
PinClientTakes a snapshot of the connection's properties.
ResetResets the component settings.
SetClientBufferCommits a data buffer to the server component.
SetClientFileEntryCommits the file entry details to the component.
StartStarts SFTP server operation.
StopStops SFTP server.

Event List


The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.

AcceptThis event is fired when new incoming connection is accepted.
AfterCreateDirectoryThis event indicates completion of directory creation request.
AfterRemoveThis event indicates completion of file removal request.
AfterRenameFileThis event indicates completion of a file rename operation.
AfterRequestAttributesThis event indicates completion of file attributes request.
AfterSetAttributesThis event indicates completion of a set attributes request.
AuthAttemptReports a user authentication attempt.
AuthFailedReports user authentication failure.
AuthPasswordThis event is fired on password authentication attempt from a client.
AuthPublicKeyThis event is fired on public key authentication attempt from a client.
AuthSucceededReports a successful user authentication.
BeforeCreateDirectoryThis event is fired when a client requests to create a directory.
BeforeDownloadFileThis event is fired when a download file request is received.
BeforeFindThis event is fired when a client requests to find files and folders in Path.
BeforeOpenClientForwardingThis event is fired when a client requests to set up client-side (local) forwarding channel.
BeforeOpenCommandThis event is fired when a client requests a command channel.
BeforeOpenServerForwardingThis event is fired when the server has received an incoming connection and needs to set up server-side (remote) forwarding channel.
BeforeOpenShellThis event is fired when a client requests a shell channel.
BeforeRemoveThis event is fired when a client requests to delete a file or directory.
BeforeRenameFileThis event is fired when a client requests to rename a file.
BeforeRequestAttributesThis event is fired when a client requests to get file attributes.
BeforeSetAttributesThis event is fired when a client requests to set file attributes.
BeforeUploadFileThis event is fired when an upload file request is received.
CloseClientForwardingThis event is fired when a client has closed a previously opened forwarding channel.
CloseCommandThis event is fired when a client has closed a previously opened SSH command channel.
CloseFileThis event instructs the application to close an opened file.
CloseServerForwardingThis event is fired when a client has closed a previously opened forwarding channel.
CloseShellThis event is fired when a client has closed a previously opened shell channel.
ConnectThis event is fired when a remote connection has been established.
CreateDirectoryThis event instructs the application to create a directory.
DisconnectThis event is fired when a client has disconnected.
ErrorInformation about errors during data delivery.
ExternalSignHandles remote or external signing initiated by the server protocol.
FindCloseThis event signifies the completion of a custom file listing operation.
FindFirstThis event signifies the start of the custom file listing retrieval mechanism.
FindNextThis event retrieves the next entry of a custom file listing.
ListeningStartedFires when the server has started accepting connections on a local port.
ListeningStoppedFires when the server has stopped accepting connections on a local port.
NotificationThis event notifies the application about an underlying control flow event.
OpenClientForwardingThis event is fired when a client opens a client-side (local) forwarding channel.
OpenCommandThis event is fired when a client has opened an SSH command channel.
OpenFileThis event instructs the application to handle the file open request.
OpenServerForwardingThis event is fired when the server opens a server-side (remote) forwarding channel.
OpenShellThis event is fired when a client has opened a shell channel.
ReadFileThis event is fired when a file read request is received.
RemoveThis event is fired when a client requests to delete a file or directory.
RenameFileThis event is fired when a client requests to rename a file.
RequestAttributesThis event is fired when a get file attributes request is received.
ServerForwardingCancelThis event is fired when the client cancels a previously negotiated server-side (remote) forwarding.
ServerForwardingOpenFailedThis event is fired when the client rejects the server request to establish a server forwarding channel.
ServerForwardingRequestThis event is fired when the client requests the server to set up server-side (remote) forwarding.
SessionClosedReports session closure.
SessionEstablishedThis event is fired when a new session is established.
SetAttributesThis event is fired when an set file attributes request is received.
TranslatePathThis event is fired when a client requests the server to translate a path to its absolute form.
WriteFileThis event is fired when a file write request is received.

Config Settings


The following is a list of config settings for the component with short descriptions. Click on the links for further details.

AllAlgorithmsReturns the list of algorithms enabled in the component.
AsyncDataWindowManagementTBD.
AuthModeControls dual/multi-type authentication mode.
AutoGenerateLongNamesTBD.
Banner[i]TBD.
BannerSendStageTBD.
CloseIfNoActiveTunnelsTBD.
CommandModeEnabledTBD.
CompressionAlgorithmsReturns the list of compression algorithms enabled in the component.
CustomDHGroupIndexSets a specific Diffie-Hellman group index to enforce.
DefBannerTBD.
DefLanguageTagTBD.
DualStackAllows the use of ip4 and ip6 simultaneously.
EncryptionAlgorithmsReturns the list of encryption algorithms enabled in the component.
KexAlgorithmsReturns the list of key exchange algorithms enabled in the component.
LanguageTag[i]TBD.
MacAlgorithmsReturns the list of MAC algorithms enabled in the component.
MaxDHGroupSizeSets the maximal Diffie-Hellman group size.
MinDHGroupSizeSets the minimal Diffie-Hellman group size.
NotifyOnFileOperationsEnables low-level file operation notifications.
PublicKeyAlgorithmsReturns the list of public key algorithms enabled in the component.
RefreshUsersEnables or disables real-time propagation of user information.
SFTPModeEnabledTBD.
ShellModeEnabledTBD.
UseStrictKeyExchangeSpecifies how strict key exchange is supported.
ASN1UseGlobalTagCacheControls whether ASN.1 module should use a global object cache.
AssignSystemSmartCardPinsSpecifies whether CSP-level PINs should be assigned to CNG keys.
CheckKeyIntegrityBeforeUseEnables or disable private key integrity check before use.
CookieCachingSpecifies whether a cookie cache should be used for HTTP(S) transports.
CookiesGets or sets local cookies for the component.
DefDeriveKeyIterationsSpecifies the default key derivation algorithm iteration count.
DNSLocalSuffixThe suffix to assign for TLD names.
EnableClientSideSSLFFDHEEnables or disables finite field DHE key exchange support in TLS clients.
GlobalCookiesGets or sets global cookies for all the HTTP transports.
HardwareCryptoUsePolicyThe hardware crypto usage policy.
HttpUserAgentSpecifies the user agent name to be used by all HTTP clients.
HttpVersionThe HTTP version to use in any inner HTTP client components created.
IgnoreExpiredMSCTLSigningCertWhether to tolerate the expired Windows Update signing certificate.
ListDelimiterThe delimiter character for multi-element lists.
LogDestinationSpecifies the debug log destination.
LogDetailsSpecifies the debug log details to dump.
LogFileSpecifies the debug log filename.
LogFiltersSpecifies the debug log filters.
LogFlushModeSpecifies the log flush mode.
LogLevelSpecifies the debug log level.
LogMaxEventCountSpecifies the maximum number of events to cache before further action is taken.
LogRotationModeSpecifies the log rotation mode.
MaxASN1BufferLengthSpecifies the maximal allowed length for ASN.1 primitive tag data.
MaxASN1TreeDepthSpecifies the maximal depth for processed ASN.1 trees.
OCSPHashAlgorithmSpecifies the hash algorithm to be used to identify certificates in OCSP requests.
OldClientSideRSAFallbackSpecifies whether the SSH client should use a SHA1 fallback.
ProductVersionReturns the version of the SecureBlackbox library.
ServerSSLDHKeyLengthSets the size of the TLS DHE key exchange group.
StaticDNSSpecifies whether static DNS rules should be used.
StaticIPAddress[domain]Gets or sets an IP address for the specified domain name.
StaticIPAddressesGets or sets all the static DNS rules.
TagAllows to store any custom data.
TLSSessionGroupSpecifies the group name of TLS sessions to be used for session resumption.
TLSSessionLifetimeSpecifies lifetime in seconds of the cached TLS session.
TLSSessionPurgeIntervalSpecifies how often the session cache should remove the expired TLS sessions.
UseInternalRandomSwitches between SecureBlackbox-own and platform PRNGs.
UseLegacyAdESValidationEnables legacy AdES validation mode.
UseOwnDNSResolverSpecifies whether the client components should use own DNS resolver.
UseSharedSystemStoragesSpecifies whether the validation engine should use a global per-process copy of the system certificate stores.
UseSystemNativeSizeCalculationAn internal CryptoAPI access tweak.
UseSystemOAEPAndPSSEnforces or disables the use of system-driven RSA OAEP and PSS computations.
UseSystemRandomEnables or disables the use of the OS PRNG.

Active Property (SFTPServer Component)

Specifies whether the SFTP server has started and ready to accept connections.

Syntax

public bool Active { get; }
Public ReadOnly Property Active As Boolean

Default Value

False

Remarks

Check this property to find out whether the SFTP server is in active mode. Use Start and Stop methods to activate or deactivate the server.

This property is read-only and not available at design time.

AuthTypes Property (SFTPServer Component)

Defines allowed authentication types.

Syntax

public int AuthTypes { get; set; }
Public Property AuthTypes As Integer

Default Value

30

Remarks

Use this property to define which authentication types are allowed on the server, set of

atRhosts0x01RHOSTS file authentication. Rarely used today.

atPublicKey0x02Public key (sometimes called private key) authentication

atPassword0x04Password-based authentication

atHostbased0x08Hostbased authentication

atKeyboard0x10Keyboard-interactive authentication. This is often used in place of generic password authentication.

atGssWithMic0x20GSS authentication

atGssKeyex0x40GSS authentication with key exchange

atPublicKeyAgent0x80Public key agent authentication

BaseDir Property (SFTPServer Component)

Specifies the server's base (root) directory.

Syntax

public string BaseDir { get; set; }
Public Property BaseDir As String

Default Value

""

Remarks

Use this property to set the base (root) directory on the server.

Capabilities Property (SFTPServer Component)

Specifies which elements of the SSH ecosystem the component must support/enable.

Syntax

public int Capabilities { get; set; }
Public Property Capabilities As Integer

Default Value

1

Remarks

Use this property to specify the capabilities of the SSH framework the component must support by adjusting the following bit flags:

scSFTP0x01SFTP (secure file transfer)

scShell0x02Remote shell access

scCommand0x04Remote command execution

scClientForwarding0x08Local (client-side) forwarding

scServerForwarding0x10Remote (server-side) forwarding

ClientFileEntry Property (SFTPServer Component)

A container for file entry details.

Syntax

public FTPListEntry ClientFileEntry { get; set; }
Public Property ClientFileEntry As FTPListEntry

Remarks

This property is a placeholder for file entry details. Use it communicate file details from your code to the server component and back. Pass the contents of ClientFileEntry to the server with SetClientFileEntry method, and retrieve them with GetClientFileEntry method.

This property may come handy when customizing file system operations, such as file listings or attribute requests.

This property is not available at design time.

Please refer to the FTPListEntry type for a complete list of fields.

CompressionLevel Property (SFTPServer Component)

Specifies the preferable compression level

Syntax

public int CompressionLevel { get; set; }
Public Property CompressionLevel As Integer

Default Value

9

Remarks

Set this property before starting the server. Possible values range from 0 (lowest compression) to 9 (maximum compression). This property is ignored if compression wasn't accepted.

ExternalCrypto Property (SFTPServer Component)

Provides access to external signing and DC parameters.

Syntax

public ExternalCrypto ExternalCrypto { get; }
Public ReadOnly Property ExternalCrypto As ExternalCrypto

Remarks

Use this property to tune-up remote cryptography settings. SecureBlackbox supports two independent types of external cryptography: synchronous (based on the ExternalSign event) and asynchronous (based on the DC protocol and the DCAuth signing component).

This property is read-only.

Please refer to the ExternalCrypto type for a complete list of fields.

FIPSMode Property (SFTPServer Component)

Reserved.

Syntax

public bool FIPSMode { get; set; }
Public Property FIPSMode As Boolean

Default Value

False

Remarks

This property is reserved for future use.

ForceCompression Property (SFTPServer Component)

This property specifies whether server explicitly requires data compression.

Syntax

public bool ForceCompression { get; set; }
Public Property ForceCompression As Boolean

Default Value

False

Remarks

Set this property before starting the server. If it is set to true, the component will explicitly request data compression. If it is set to False, the component will support compression, although compression will be used only if the remote party doesn't support algorithms without compression.

Host Property (SFTPServer Component)

Specifies server's host name.

Syntax

public string Host { get; set; }
Public Property Host As String

Default Value

""

Remarks

Use this property to set the host name for this server.

Key Property (SFTPServer Component)

Contains client's public key.

Syntax

public SSHKey Key { get; }
Public ReadOnly Property Key As SSHKey

Remarks

This property returns the current client's public key. Check this property inside your AuthPublicKey event handler.

This property is read-only and not available at design time.

Please refer to the SSHKey type for a complete list of fields.

MaxSFTPVersion Property (SFTPServer Component)

Maximum SFTP version supported.

Syntax

public int MaxSFTPVersion { get; set; }
Public Property MaxSFTPVersion As Integer

Default Value

6

Remarks

MaxSFTPVersion and MinSFTPVersion properties control the range of SFTP protocol versions supported by this server.

MinSFTPVersion Property (SFTPServer Component)

Minimum SFTP version supported.

Syntax

public int MinSFTPVersion { get; set; }
Public Property MinSFTPVersion As Integer

Default Value

0

Remarks

MaxSFTPVersion and MinSFTPVersion properties control the range of SFTP protocol versions supported by this server.

PinnedClient Property (SFTPServer Component)

Populates the pinned client details.

Syntax

public SSHConnectionInfo PinnedClient { get; }
Public ReadOnly Property PinnedClient As SSHConnectionInfo

Remarks

Use this property to access the details of the client connection previously pinned with PinClient method.

This property is read-only and not available at design time.

Please refer to the SSHConnectionInfo type for a complete list of fields.

Port Property (SFTPServer Component)

Specifies the listening port number.

Syntax

public int Port { get; set; }
Public Property Port As Integer

Default Value

22

Remarks

Use this property to specify on which port the component will be listening to client connections.

ReadOnly Property (SFTPServer Component)

Specifies whether files on the server are read-only.

Syntax

public bool ReadOnly { get; set; }
Public Property ReadOnly As Boolean

Default Value

False

Remarks

Set this property to true to deny all client requests to change files on the server.

ServerKeys Property (SFTPServer Component)

The server's SSH keys.

Syntax

public SSHKeyList ServerKeys { get; }
Public Property ServerKeys As SSHKeyList

Remarks

Use this property to provide a list of SSH private keys for the server endpoint.

An SSH endpoint needs a private key to be able to accept secure connections. Apart from being employed for the handshake, the key is also used as a unique server identifier.

The collection may include more than one endpoint key. A typical usage scenario is to include two or three keys (ECDSA, RSA, and DSS), to cater for clients with different algorithm preferences.

This property is not available at design time.

Please refer to the SSHKey type for a complete list of fields.

SocketSettings Property (SFTPServer Component)

Manages network connection settings.

Syntax

public SocketSettings SocketSettings { get; }
Public ReadOnly Property SocketSettings As SocketSettings

Remarks

Use this property to tune up network connection parameters.

This property is read-only.

Please refer to the SocketSettings type for a complete list of fields.

SSHSettings Property (SFTPServer Component)

The SSH connection settings.

Syntax

public SSHSettings SSHSettings { get; }
Public ReadOnly Property SSHSettings As SSHSettings

Remarks

Use this property to access and tune-up the SSH layer settings.

This property is read-only.

Please refer to the SSHSettings type for a complete list of fields.

Users Property (SFTPServer Component)

A collection of known users.

Syntax

public UserAccountList Users { get; }
Public Property Users As UserAccountList

Remarks

This property provides access to registered user database.

This property is not available at design time.

Please refer to the UserAccount type for a complete list of fields.

UseUTF8 Property (SFTPServer Component)

Specifies whether UTF8 conversion is to be used when parsing file names.

Syntax

public bool UseUTF8 { get; set; }
Public Property UseUTF8 As Boolean

Default Value

False

Remarks

This property specifies whether UTF8 conversion of filenames is used by the server. It is set automatically according to protocol flow, but user could also set it to the desired value.

Cleanup Method (SFTPServer Component)

Cleans up the server environment by purging expired sessions and cleaning caches.

Syntax

public void Cleanup();
Public Sub Cleanup()

Remarks

Call this method while the server is active to clean up the environment allocated for the server by releasing unused resources and cleaning caches.

Config Method (SFTPServer Component)

Sets or retrieves a configuration setting.

Syntax

public string Config(string configurationString);
Public Function Config(ByVal ConfigurationString As String) As String

Remarks

Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

DoAction Method (SFTPServer Component)

Performs an additional action.

Syntax

public string DoAction(string actionID, string actionParams);
Public Function DoAction(ByVal ActionID As String, ByVal ActionParams As String) As String

Remarks

DoAction is a generic method available in every component. It is used to perform an additional action introduced after the product major release. The list of actions is not fixed, and may be flexibly extended over time.

The unique identifier (case insensitive) of the action is provided in the ActionID parameter.

ActionParams contains the value of a single parameter, or a list of multiple parameters for the action in the form of PARAM1=VALUE1;PARAM2=VALUE2;....

DropClient Method (SFTPServer Component)

Terminates a client connection.

Syntax

public void DropClient(long connectionId, bool forced);
Public Sub DropClient(ByVal ConnectionId As Long, ByVal Forced As Boolean)

Remarks

Call this method to shut down a connected client. Forced indicates whether the connection should be closed in a graceful manner.

GetClientBuffer Method (SFTPServer Component)

Acquires a piece of operation data.

Syntax

public byte[] GetClientBuffer(long connectionID, string handle);
Public Function GetClientBuffer(ByVal ConnectionID As Long, ByVal Handle As String) As Byte()

Remarks

Use this method to obtain a piece of data relevant to a transfer operation in a thread-safe way.

A typical place to call this method is inside the WriteFile event handler, when implementing customized file transfers.

GetClientFileEntry Method (SFTPServer Component)

Acquires file entry details from the component.

Syntax

public void GetClientFileEntry(long connectionID, string handle);
Public Sub GetClientFileEntry(ByVal ConnectionID As Long, ByVal Handle As String)

Remarks

Use this method to acquire the details of a file entry from the server in atomic and thread-safe way. After this method completes, the entry details will be propagated in ClientFileEntry property.

When calling this method, pass the client connection ID in ConnectionID property, and the opened file handle (if needed) in Handle property.

ListClients Method (SFTPServer Component)

Enumerates the connected clients.

Syntax

public string ListClients();
Public Function ListClients() As String

Remarks

This method enumerates the connected clients. It returns a list of strings, with each string being of 'ConnectionID|Address|Port' format, and representing a single connection.

PinClient Method (SFTPServer Component)

Takes a snapshot of the connection's properties.

Syntax

public void PinClient(long connectionId);
Public Sub PinClient(ByVal ConnectionId As Long)

Remarks

Use this method to take a snapshot of a connected client. The captured properties are populated in PinnedClient property.

Reset Method (SFTPServer Component)

Resets the component settings.

Syntax

public void Reset();
Public Sub Reset()

Remarks

Reset is a generic method available in every component.

SetClientBuffer Method (SFTPServer Component)

Commits a data buffer to the server component.

Syntax

public void SetClientBuffer(long connectionID, string handle, byte[] value);
Public Sub SetClientBuffer(ByVal ConnectionID As Long, ByVal Handle As String, ByVal Value As Byte())

Remarks

Use this method to commit a data buffer passed via the Value parameter to the server control in a thread-safe way.

One example where you might need to pass your buffer to the server is when customizing upload operations via ReadFile event.

SetClientFileEntry Method (SFTPServer Component)

Commits the file entry details to the component.

Syntax

public void SetClientFileEntry(long connectionID, string handle);
Public Sub SetClientFileEntry(ByVal ConnectionID As Long, ByVal Handle As String)

Remarks

Use this method to commit the file entry details configured in ClientFileEntry property to the server object in a thread-safe way. Pass the client's connection ID via ConnectionID property, and the file entry's handle via Handle.

Start Method (SFTPServer Component)

Starts SFTP server operation.

Syntax

public void Start();
Public Sub Start()

Remarks

Call this method to start listening to incoming connections.

Stop Method (SFTPServer Component)

Stops SFTP server.

Syntax

public void Stop();
Public Sub Stop()

Remarks

Call this method to close all connections and stop listening to clients.

Accept Event (SFTPServer Component)

This event is fired when new incoming connection is accepted.

Syntax

public event OnAcceptHandler OnAccept;

public delegate void OnAcceptHandler(object sender, SFTPServerAcceptEventArgs e);

public class SFTPServerAcceptEventArgs : EventArgs {
  public string RemoteAddress { get; }
  public int RemotePort { get; }
  public bool Accept { get; set; }
}
Public Event OnAccept As OnAcceptHandler

Public Delegate Sub OnAcceptHandler(sender As Object, e As SFTPServerAcceptEventArgs)

Public Class SFTPServerAcceptEventArgs Inherits EventArgs
  Public ReadOnly Property RemoteAddress As String
  Public ReadOnly Property RemotePort As Integer
  Public Property Accept As Boolean
End Class

Remarks

This event is fired by the component before a new incoming connection is accepted. RemoteAddress contains the IP address of the connecting client. Use the Accept parameter to either accept, or reject the connection.

AfterCreateDirectory Event (SFTPServer Component)

This event indicates completion of directory creation request.

Syntax

public event OnAfterCreateDirectoryHandler OnAfterCreateDirectory;

public delegate void OnAfterCreateDirectoryHandler(object sender, SFTPServerAfterCreateDirectoryEventArgs e);

public class SFTPServerAfterCreateDirectoryEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int OperationStatus { get; set; }
}
Public Event OnAfterCreateDirectory As OnAfterCreateDirectoryHandler

Public Delegate Sub OnAfterCreateDirectoryHandler(sender As Object, e As SFTPServerAfterCreateDirectoryEventArgs)

Public Class SFTPServerAfterCreateDirectoryEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired to report completion of a directory creation request. The ConnectionID parameter specifies in which session the request was received, the Path specifies the directory path, and the OperationStatus contains the operation result.

If needed, you can amend the OperationStatus to return a different operation result:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

AfterRemove Event (SFTPServer Component)

This event indicates completion of file removal request.

Syntax

public event OnAfterRemoveHandler OnAfterRemove;

public delegate void OnAfterRemoveHandler(object sender, SFTPServerAfterRemoveEventArgs e);

public class SFTPServerAfterRemoveEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int OperationStatus { get; set; }
}
Public Event OnAfterRemove As OnAfterRemoveHandler

Public Delegate Sub OnAfterRemoveHandler(sender As Object, e As SFTPServerAfterRemoveEventArgs)

Public Class SFTPServerAfterRemoveEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request to delete a file or directory has been processed by the server. The ConnectionID parameter specifies the session in which the request was received. OperationStatus contains the operation result.

If needed, you can amend the OperationStatus to return a different operation result:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

AfterRenameFile Event (SFTPServer Component)

This event indicates completion of a file rename operation.

Syntax

public event OnAfterRenameFileHandler OnAfterRenameFile;

public delegate void OnAfterRenameFileHandler(object sender, SFTPServerAfterRenameFileEventArgs e);

public class SFTPServerAfterRenameFileEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string OldPath { get; }
  public string NewPath { get; }
  public int OperationStatus { get; set; }
}
Public Event OnAfterRenameFile As OnAfterRenameFileHandler

Public Delegate Sub OnAfterRenameFileHandler(sender As Object, e As SFTPServerAfterRenameFileEventArgs)

Public Class SFTPServerAfterRenameFileEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property OldPath As String
  Public ReadOnly Property NewPath As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request to rename a file (from OldPath to NewPath) has been processed. The ConnectionID parameter specifies in which session the request was received, and OperationStatus contains the operation result.

If needed, you can amend the OperationStatus to return a different operation result:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

AfterRequestAttributes Event (SFTPServer Component)

This event indicates completion of file attributes request.

Syntax

public event OnAfterRequestAttributesHandler OnAfterRequestAttributes;

public delegate void OnAfterRequestAttributesHandler(object sender, SFTPServerAfterRequestAttributesEventArgs e);

public class SFTPServerAfterRequestAttributesEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int OperationStatus { get; set; }
}
Public Event OnAfterRequestAttributes As OnAfterRequestAttributesHandler

Public Delegate Sub OnAfterRequestAttributesHandler(sender As Object, e As SFTPServerAfterRequestAttributesEventArgs)

Public Class SFTPServerAfterRequestAttributesEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request for get file attributes has been processed by the server. The ConnectionID parameter specifies in which session the request was received. OperationStatus contains the result of the operation.

If needed, you can amend the OperationStatus to return a different operation result:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

AfterSetAttributes Event (SFTPServer Component)

This event indicates completion of a set attributes request.

Syntax

public event OnAfterSetAttributesHandler OnAfterSetAttributes;

public delegate void OnAfterSetAttributesHandler(object sender, SFTPServerAfterSetAttributesEventArgs e);

public class SFTPServerAfterSetAttributesEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int OperationStatus { get; set; }
}
Public Event OnAfterSetAttributes As OnAfterSetAttributesHandler

Public Delegate Sub OnAfterSetAttributesHandler(sender As Object, e As SFTPServerAfterSetAttributesEventArgs)

Public Class SFTPServerAfterSetAttributesEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request for set file attributes has been processed. The ConnectionID parameter specifies in which session the request was received. The OperationStatus parameter contains the operation result.

If needed, you can amend the OperationStatus to return a different operation result:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

AuthAttempt Event (SFTPServer Component)

Reports a user authentication attempt.

Syntax

public event OnAuthAttemptHandler OnAuthAttempt;

public delegate void OnAuthAttemptHandler(object sender, SFTPServerAuthAttemptEventArgs e);

public class SFTPServerAuthAttemptEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Username { get; }
  public int AuthType { get; }
  public bool Accept { get; set; }
}
Public Event OnAuthAttempt As OnAuthAttemptHandler

Public Delegate Sub OnAuthAttemptHandler(sender As Object, e As SFTPServerAuthAttemptEventArgs)

Public Class SFTPServerAuthAttemptEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Username As String
  Public ReadOnly Property AuthType As Integer
  Public Property Accept As Boolean
End Class

Remarks

ConnectionID identifies the session, Username specifies client's username, and AuthType specifies the authentication type. Use the Accept parameter to accept or decline the attempt.

Supported authentication types:

atRhosts0x01RHOSTS file authentication. Rarely used today.

atPublicKey0x02Public key (sometimes called private key) authentication

atPassword0x04Password-based authentication

atHostbased0x08Hostbased authentication

atKeyboard0x10Keyboard-interactive authentication. This is often used in place of generic password authentication.

atGssWithMic0x20GSS authentication

atGssKeyex0x40GSS authentication with key exchange

atPublicKeyAgent0x80Public key agent authentication

AuthFailed Event (SFTPServer Component)

Reports user authentication failure.

Syntax

public event OnAuthFailedHandler OnAuthFailed;

public delegate void OnAuthFailedHandler(object sender, SFTPServerAuthFailedEventArgs e);

public class SFTPServerAuthFailedEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Username { get; }
  public int AuthType { get; }
}
Public Event OnAuthFailed As OnAuthFailedHandler

Public Delegate Sub OnAuthFailedHandler(sender As Object, e As SFTPServerAuthFailedEventArgs)

Public Class SFTPServerAuthFailedEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Username As String
  Public ReadOnly Property AuthType As Integer
End Class

Remarks

ConnectionID identifies the session, Username specify client's username, and AuthType specifies what authentication type was used.

Supported authentication types:

atRhosts0x01RHOSTS file authentication. Rarely used today.

atPublicKey0x02Public key (sometimes called private key) authentication

atPassword0x04Password-based authentication

atHostbased0x08Hostbased authentication

atKeyboard0x10Keyboard-interactive authentication. This is often used in place of generic password authentication.

atGssWithMic0x20GSS authentication

atGssKeyex0x40GSS authentication with key exchange

atPublicKeyAgent0x80Public key agent authentication

AuthPassword Event (SFTPServer Component)

This event is fired on password authentication attempt from a client.

Syntax

public event OnAuthPasswordHandler OnAuthPassword;

public delegate void OnAuthPasswordHandler(object sender, SFTPServerAuthPasswordEventArgs e);

public class SFTPServerAuthPasswordEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Username { get; }
  public string Password { get; }
  public bool Accept { get; set; }
  public bool ForceChangePassword { get; set; }
}
Public Event OnAuthPassword As OnAuthPasswordHandler

Public Delegate Sub OnAuthPasswordHandler(sender As Object, e As SFTPServerAuthPasswordEventArgs)

Public Class SFTPServerAuthPasswordEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Username As String
  Public ReadOnly Property Password As String
  Public Property Accept As Boolean
  Public Property ForceChangePassword As Boolean
End Class

Remarks

Parameters Username and Password contain user credentials. If they are correct, set Accept to true. You can request password change by setting ForceChangePassword to true.

AuthPublicKey Event (SFTPServer Component)

This event is fired on public key authentication attempt from a client.

Syntax

public event OnAuthPublicKeyHandler OnAuthPublicKey;

public delegate void OnAuthPublicKeyHandler(object sender, SFTPServerAuthPublicKeyEventArgs e);

public class SFTPServerAuthPublicKeyEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Username { get; }
  public bool Accept { get; set; }
}
Public Event OnAuthPublicKey As OnAuthPublicKeyHandler

Public Delegate Sub OnAuthPublicKeyHandler(sender As Object, e As SFTPServerAuthPublicKeyEventArgs)

Public Class SFTPServerAuthPublicKeyEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Username As String
  Public Property Accept As Boolean
End Class

Remarks

Username specifies client's username, and Accept is used to accept or reject authentication.

AuthSucceeded Event (SFTPServer Component)

Reports a successful user authentication.

Syntax

public event OnAuthSucceededHandler OnAuthSucceeded;

public delegate void OnAuthSucceededHandler(object sender, SFTPServerAuthSucceededEventArgs e);

public class SFTPServerAuthSucceededEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Username { get; }
  public int AuthType { get; }
}
Public Event OnAuthSucceeded As OnAuthSucceededHandler

Public Delegate Sub OnAuthSucceededHandler(sender As Object, e As SFTPServerAuthSucceededEventArgs)

Public Class SFTPServerAuthSucceededEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Username As String
  Public ReadOnly Property AuthType As Integer
End Class

Remarks

ConnectionID identifies the session, Username specify client's username, and AuthType specifies what authentication type was used.

Supported authentication types:

atRhosts0x01RHOSTS file authentication. Rarely used today.

atPublicKey0x02Public key (sometimes called private key) authentication

atPassword0x04Password-based authentication

atHostbased0x08Hostbased authentication

atKeyboard0x10Keyboard-interactive authentication. This is often used in place of generic password authentication.

atGssWithMic0x20GSS authentication

atGssKeyex0x40GSS authentication with key exchange

atPublicKeyAgent0x80Public key agent authentication

BeforeCreateDirectory Event (SFTPServer Component)

This event is fired when a client requests to create a directory.

Syntax

public event OnBeforeCreateDirectoryHandler OnBeforeCreateDirectory;

public delegate void OnBeforeCreateDirectoryHandler(object sender, SFTPServerBeforeCreateDirectoryEventArgs e);

public class SFTPServerBeforeCreateDirectoryEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int Action { get; set; }
}
Public Event OnBeforeCreateDirectory As OnBeforeCreateDirectoryHandler

Public Delegate Sub OnBeforeCreateDirectoryHandler(sender As Object, e As SFTPServerBeforeCreateDirectoryEventArgs)

Public Class SFTPServerBeforeCreateDirectoryEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to create a directory has been received. The ConnectionID parameter specifies in which session the request was received.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeDownloadFile Event (SFTPServer Component)

This event is fired when a download file request is received.

Syntax

public event OnBeforeDownloadFileHandler OnBeforeDownloadFile;

public delegate void OnBeforeDownloadFileHandler(object sender, SFTPServerBeforeDownloadFileEventArgs e);

public class SFTPServerBeforeDownloadFileEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int Action { get; set; }
}
Public Event OnBeforeDownloadFile As OnBeforeDownloadFileHandler

Public Delegate Sub OnBeforeDownloadFileHandler(sender As Object, e As SFTPServerBeforeDownloadFileEventArgs)

Public Class SFTPServerBeforeDownloadFileEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to download file is received from the client. The ConnectionID parameter specifies in which session the request was received.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeFind Event (SFTPServer Component)

This event is fired when a client requests to find files and folders in Path.

Syntax

public event OnBeforeFindHandler OnBeforeFind;

public delegate void OnBeforeFindHandler(object sender, SFTPServerBeforeFindEventArgs e);

public class SFTPServerBeforeFindEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int Action { get; set; }
}
Public Event OnBeforeFind As OnBeforeFindHandler

Public Delegate Sub OnBeforeFindHandler(sender As Object, e As SFTPServerBeforeFindEventArgs)

Public Class SFTPServerBeforeFindEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to find files and folders in Path has been received. The ConnectionID parameter specifies in which session the request was received.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeOpenClientForwarding Event (SFTPServer Component)

This event is fired when a client requests to set up client-side (local) forwarding channel.

Syntax

public event OnBeforeOpenClientForwardingHandler OnBeforeOpenClientForwarding;

public delegate void OnBeforeOpenClientForwardingHandler(object sender, SFTPServerBeforeOpenClientForwardingEventArgs e);

public class SFTPServerBeforeOpenClientForwardingEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string DestHost { get; set; }
  public int DestPort { get; set; }
  public string SrcHost { get; }
  public int SrcPort { get; }
  public int Action { get; set; }
}
Public Event OnBeforeOpenClientForwarding As OnBeforeOpenClientForwardingHandler

Public Delegate Sub OnBeforeOpenClientForwardingHandler(sender As Object, e As SFTPServerBeforeOpenClientForwardingEventArgs)

Public Class SFTPServerBeforeOpenClientForwardingEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public Property DestHost As String
  Public Property DestPort As Integer
  Public ReadOnly Property SrcHost As String
  Public ReadOnly Property SrcPort As Integer
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to open a client forwarding has been received. The ConnectionID parameter specifies in which session the request was received.

If permitted, the server will open a connection to DestHost:DestPort and start forwarding any data received from the client to that endpoint. You can enable or disable client forwarding blanketly via the Capabilities property.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeOpenCommand Event (SFTPServer Component)

This event is fired when a client requests a command channel.

Syntax

public event OnBeforeOpenCommandHandler OnBeforeOpenCommand;

public delegate void OnBeforeOpenCommandHandler(object sender, SFTPServerBeforeOpenCommandEventArgs e);

public class SFTPServerBeforeOpenCommandEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Command { get; set; }
  public int Action { get; set; }
}
Public Event OnBeforeOpenCommand As OnBeforeOpenCommandHandler

Public Delegate Sub OnBeforeOpenCommandHandler(sender As Object, e As SFTPServerBeforeOpenCommandEventArgs)

Public Class SFTPServerBeforeOpenCommandEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public Property Command As String
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to open a command has been received. The ConnectionID parameter specifies in which session the request was received.

If permitted, the component will launch the command in a separate process. Note that allowing command access to all clients can be dangerous. You can enable or disable command support blanketly via the Capabilities property.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeOpenServerForwarding Event (SFTPServer Component)

This event is fired when the server has received an incoming connection and needs to set up server-side (remote) forwarding channel.

Syntax

public event OnBeforeOpenServerForwardingHandler OnBeforeOpenServerForwarding;

public delegate void OnBeforeOpenServerForwardingHandler(object sender, SFTPServerBeforeOpenServerForwardingEventArgs e);

public class SFTPServerBeforeOpenServerForwardingEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string LocalHost { get; }
  public int LocalPort { get; }
  public string SrcHost { get; }
  public int SrcPort { get; }
  public int Action { get; set; }
}
Public Event OnBeforeOpenServerForwarding As OnBeforeOpenServerForwardingHandler

Public Delegate Sub OnBeforeOpenServerForwardingHandler(sender As Object, e As SFTPServerBeforeOpenServerForwardingEventArgs)

Public Class SFTPServerBeforeOpenServerForwardingEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property LocalHost As String
  Public ReadOnly Property LocalPort As Integer
  Public ReadOnly Property SrcHost As String
  Public ReadOnly Property SrcPort As Integer
  Public Property Action As Integer
End Class

Remarks

The ConnectionID parameter specifies in which session the request was received.

If permitted, the server will accept the connection and ask the client to confirm forwarding to DestHost:DestPort. If that is successful, the server will fire the OpenServerForwarding event.

You can enable or disable client forwarding blanketly via the Capabilities property.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeOpenShell Event (SFTPServer Component)

This event is fired when a client requests a shell channel.

Syntax

public event OnBeforeOpenShellHandler OnBeforeOpenShell;

public delegate void OnBeforeOpenShellHandler(object sender, SFTPServerBeforeOpenShellEventArgs e);

public class SFTPServerBeforeOpenShellEventArgs : EventArgs {
  public long ConnectionID { get; }
  public int Action { get; set; }
}
Public Event OnBeforeOpenShell As OnBeforeOpenShellHandler

Public Delegate Sub OnBeforeOpenShellHandler(sender As Object, e As SFTPServerBeforeOpenShellEventArgs)

Public Class SFTPServerBeforeOpenShellEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to open a shell has been received. The ConnectionID parameter specifies in which session the request was received.

If permitted, the client will be able to send commands to the shell. Note that allowing shell access to all clients can be dangerous. You can enable or disable shell access blanketly via the Capabilities property.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeRemove Event (SFTPServer Component)

This event is fired when a client requests to delete a file or directory.

Syntax

public event OnBeforeRemoveHandler OnBeforeRemove;

public delegate void OnBeforeRemoveHandler(object sender, SFTPServerBeforeRemoveEventArgs e);

public class SFTPServerBeforeRemoveEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int Action { get; set; }
}
Public Event OnBeforeRemove As OnBeforeRemoveHandler

Public Delegate Sub OnBeforeRemoveHandler(sender As Object, e As SFTPServerBeforeRemoveEventArgs)

Public Class SFTPServerBeforeRemoveEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to delete a file or directory is received from the client. The ConnectionID parameter specifies in which session the request was received.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeRenameFile Event (SFTPServer Component)

This event is fired when a client requests to rename a file.

Syntax

public event OnBeforeRenameFileHandler OnBeforeRenameFile;

public delegate void OnBeforeRenameFileHandler(object sender, SFTPServerBeforeRenameFileEventArgs e);

public class SFTPServerBeforeRenameFileEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string OldPath { get; }
  public string NewPath { get; }
  public int Action { get; set; }
}
Public Event OnBeforeRenameFile As OnBeforeRenameFileHandler

Public Delegate Sub OnBeforeRenameFileHandler(sender As Object, e As SFTPServerBeforeRenameFileEventArgs)

Public Class SFTPServerBeforeRenameFileEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property OldPath As String
  Public ReadOnly Property NewPath As String
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to rename a file (from OldPath to NewPath) is received from the client. The ConnectionID parameter specifies in which session the request was received.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeRequestAttributes Event (SFTPServer Component)

This event is fired when a client requests to get file attributes.

Syntax

public event OnBeforeRequestAttributesHandler OnBeforeRequestAttributes;

public delegate void OnBeforeRequestAttributesHandler(object sender, SFTPServerBeforeRequestAttributesEventArgs e);

public class SFTPServerBeforeRequestAttributesEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int Action { get; set; }
}
Public Event OnBeforeRequestAttributes As OnBeforeRequestAttributesHandler

Public Delegate Sub OnBeforeRequestAttributesHandler(sender As Object, e As SFTPServerBeforeRequestAttributesEventArgs)

Public Class SFTPServerBeforeRequestAttributesEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to get file attributes has been received. The ConnectionID parameter specifies in which session the request was received.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeSetAttributes Event (SFTPServer Component)

This event is fired when a client requests to set file attributes.

Syntax

public event OnBeforeSetAttributesHandler OnBeforeSetAttributes;

public delegate void OnBeforeSetAttributesHandler(object sender, SFTPServerBeforeSetAttributesEventArgs e);

public class SFTPServerBeforeSetAttributesEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int Action { get; set; }
}
Public Event OnBeforeSetAttributes As OnBeforeSetAttributesHandler

Public Delegate Sub OnBeforeSetAttributesHandler(sender As Object, e As SFTPServerBeforeSetAttributesEventArgs)

Public Class SFTPServerBeforeSetAttributesEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to set file attributes has been received. The ConnectionID parameter specifies in which session the request was received.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

BeforeUploadFile Event (SFTPServer Component)

This event is fired when an upload file request is received.

Syntax

public event OnBeforeUploadFileHandler OnBeforeUploadFile;

public delegate void OnBeforeUploadFileHandler(object sender, SFTPServerBeforeUploadFileEventArgs e);

public class SFTPServerBeforeUploadFileEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int Action { get; set; }
}
Public Event OnBeforeUploadFile As OnBeforeUploadFileHandler

Public Delegate Sub OnBeforeUploadFileHandler(sender As Object, e As SFTPServerBeforeUploadFileEventArgs)

Public Class SFTPServerBeforeUploadFileEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property Action As Integer
End Class

Remarks

This event is fired when an upload file request is received from the client. The ConnectionID parameter specifies in which session the request was received, and Path specifies the location on the server where the file needs to be saved.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

CloseClientForwarding Event (SFTPServer Component)

This event is fired when a client has closed a previously opened forwarding channel.

Syntax

public event OnCloseClientForwardingHandler OnCloseClientForwarding;

public delegate void OnCloseClientForwardingHandler(object sender, SFTPServerCloseClientForwardingEventArgs e);

public class SFTPServerCloseClientForwardingEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string DestHost { get; }
  public int DestPort { get; }
  public string SrcHost { get; }
  public int SrcPort { get; }
}
Public Event OnCloseClientForwarding As OnCloseClientForwardingHandler

Public Delegate Sub OnCloseClientForwardingHandler(sender As Object, e As SFTPServerCloseClientForwardingEventArgs)

Public Class SFTPServerCloseClientForwardingEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property DestHost As String
  Public ReadOnly Property DestPort As Integer
  Public ReadOnly Property SrcHost As String
  Public ReadOnly Property SrcPort As Integer
End Class

Remarks

The ConnectionID parameter specifies in which session the request was received.

CloseCommand Event (SFTPServer Component)

This event is fired when a client has closed a previously opened SSH command channel.

Syntax

public event OnCloseCommandHandler OnCloseCommand;

public delegate void OnCloseCommandHandler(object sender, SFTPServerCloseCommandEventArgs e);

public class SFTPServerCloseCommandEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Command { get; }
}
Public Event OnCloseCommand As OnCloseCommandHandler

Public Delegate Sub OnCloseCommandHandler(sender As Object, e As SFTPServerCloseCommandEventArgs)

Public Class SFTPServerCloseCommandEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Command As String
End Class

Remarks

The ConnectionID parameter specifies in which session the request was received.

CloseFile Event (SFTPServer Component)

This event instructs the application to close an opened file.

Syntax

public event OnCloseFileHandler OnCloseFile;

public delegate void OnCloseFileHandler(object sender, SFTPServerCloseFileEventArgs e);

public class SFTPServerCloseFileEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Handle { get; }
  public int OperationStatus { get; set; }
}
Public Event OnCloseFile As OnCloseFileHandler

Public Delegate Sub OnCloseFileHandler(sender As Object, e As SFTPServerCloseFileEventArgs)

Public Class SFTPServerCloseFileEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Handle As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired upon receipt of a close-file packet from a client. Servers implementing virtualized transfers must close the previously opened local file referenced by Handle in this event handler. No further operations are allowed with the closed file.

Set OperationStatus to one of the following values to report the result of this operation to the client:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

CloseServerForwarding Event (SFTPServer Component)

This event is fired when a client has closed a previously opened forwarding channel.

Syntax

public event OnCloseServerForwardingHandler OnCloseServerForwarding;

public delegate void OnCloseServerForwardingHandler(object sender, SFTPServerCloseServerForwardingEventArgs e);

public class SFTPServerCloseServerForwardingEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string LocalHost { get; }
  public int LocalPort { get; }
  public string SrcHost { get; }
  public int SrcPort { get; }
}
Public Event OnCloseServerForwarding As OnCloseServerForwardingHandler

Public Delegate Sub OnCloseServerForwardingHandler(sender As Object, e As SFTPServerCloseServerForwardingEventArgs)

Public Class SFTPServerCloseServerForwardingEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property LocalHost As String
  Public ReadOnly Property LocalPort As Integer
  Public ReadOnly Property SrcHost As String
  Public ReadOnly Property SrcPort As Integer
End Class

Remarks

The ConnectionID parameter specifies in which session the request was received.

CloseShell Event (SFTPServer Component)

This event is fired when a client has closed a previously opened shell channel.

Syntax

public event OnCloseShellHandler OnCloseShell;

public delegate void OnCloseShellHandler(object sender, SFTPServerCloseShellEventArgs e);

public class SFTPServerCloseShellEventArgs : EventArgs {
  public long ConnectionID { get; }
}
Public Event OnCloseShell As OnCloseShellHandler

Public Delegate Sub OnCloseShellHandler(sender As Object, e As SFTPServerCloseShellEventArgs)

Public Class SFTPServerCloseShellEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
End Class

Remarks

The ConnectionID parameter specifies in which session the request was received.

Connect Event (SFTPServer Component)

This event is fired when a remote connection has been established.

Syntax

public event OnConnectHandler OnConnect;

public delegate void OnConnectHandler(object sender, SFTPServerConnectEventArgs e);

public class SFTPServerConnectEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string RemoteAddress { get; }
  public int RemotePort { get; }
}
Public Event OnConnect As OnConnectHandler

Public Delegate Sub OnConnectHandler(sender As Object, e As SFTPServerConnectEventArgs)

Public Class SFTPServerConnectEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property RemoteAddress As String
  Public ReadOnly Property RemotePort As Integer
End Class

Remarks

ConnectionID contains a session identifier, and RemoteAddress specifies the client's IP address.

CreateDirectory Event (SFTPServer Component)

This event instructs the application to create a directory.

Syntax

public event OnCreateDirectoryHandler OnCreateDirectory;

public delegate void OnCreateDirectoryHandler(object sender, SFTPServerCreateDirectoryEventArgs e);

public class SFTPServerCreateDirectoryEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int OperationStatus { get; set; }
}
Public Event OnCreateDirectory As OnCreateDirectoryHandler

Public Delegate Sub OnCreateDirectoryHandler(sender As Object, e As SFTPServerCreateDirectoryEventArgs)

Public Class SFTPServerCreateDirectoryEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request to create a directory has been received and needs to be served (virtualized) by the application. The ConnectionID parameter specifies the session that has communicated the request, and Path contains the name of the directory to be created.

Set OperationStatus to one of the below values according to the outcome of the request processing:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

Disconnect Event (SFTPServer Component)

This event is fired when a client has disconnected.

Syntax

public event OnDisconnectHandler OnDisconnect;

public delegate void OnDisconnectHandler(object sender, SFTPServerDisconnectEventArgs e);

public class SFTPServerDisconnectEventArgs : EventArgs {
  public long ConnectionID { get; }
}
Public Event OnDisconnect As OnDisconnectHandler

Public Delegate Sub OnDisconnectHandler(sender As Object, e As SFTPServerDisconnectEventArgs)

Public Class SFTPServerDisconnectEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
End Class

Remarks

This event reports loss of connection to the client within the session specified by ConnectionID.

Error Event (SFTPServer Component)

Information about errors during data delivery.

Syntax

public event OnErrorHandler OnError;

public delegate void OnErrorHandler(object sender, SFTPServerErrorEventArgs e);

public class SFTPServerErrorEventArgs : EventArgs {
  public long ConnectionID { get; }
  public int ErrorCode { get; }
  public bool Fatal { get; }
  public bool Remote { get; }
  public string Description { get; }
}
Public Event OnError As OnErrorHandler

Public Delegate Sub OnErrorHandler(sender As Object, e As SFTPServerErrorEventArgs)

Public Class SFTPServerErrorEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property ErrorCode As Integer
  Public ReadOnly Property Fatal As Boolean
  Public ReadOnly Property Remote As Boolean
  Public ReadOnly Property Description As String
End Class

Remarks

The event is fired in case of exceptional conditions during message processing.

ErrorCode contains an error code and Description contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the SFTP section.

ExternalSign Event (SFTPServer Component)

Handles remote or external signing initiated by the server protocol.

Syntax

public event OnExternalSignHandler OnExternalSign;

public delegate void OnExternalSignHandler(object sender, SFTPServerExternalSignEventArgs e);

public class SFTPServerExternalSignEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string OperationId { get; }
  public string HashAlgorithm { get; }
  public string Pars { get; }
  public string Data { get; }
  public string SignedData { get; set; }
}
Public Event OnExternalSign As OnExternalSignHandler

Public Delegate Sub OnExternalSignHandler(sender As Object, e As SFTPServerExternalSignEventArgs)

Public Class SFTPServerExternalSignEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property OperationId As String
  Public ReadOnly Property HashAlgorithm As String
  Public ReadOnly Property Pars As String
  Public ReadOnly Property Data As String
  Public Property SignedData As String
End Class

Remarks

Assign a handler to this event if you need to delegate a low-level signing operation to an external, remote, or custom signing engine. Depending on the settings, the handler will receive a hashed or unhashed value to be signed.

The event handler must pass the value of Data to the signer, obtain the signature, and pass it back to the component via the SignedData parameter.

OperationId provides a comment about the operation and its origin. It depends on the exact component being used, and may be empty. HashAlgorithm specifies the hash algorithm being used for the operation, and Pars contains algorithm-dependent parameters.

The component uses base16 (hex) encoding for the Data, SignedData, and Pars parameters. If your signing engine uses a different input and output encoding, you may need to decode and/or encode the data before and/or after the signing.

A sample MD5 hash encoded in base16: a0dee2a0382afbb09120ffa7ccd8a152 - lower case base16 A0DEE2A0382AFBB09120FFA7CCD8A152 - upper case base16

A sample event handler that uses the .NET RSACryptoServiceProvider class may look like the following: signer.OnExternalSign += (s, e) => { var cert = new X509Certificate2("cert.pfx", "", X509KeyStorageFlags.Exportable); var key = (RSACryptoServiceProvider)cert.PrivateKey; var dataToSign = e.Data.FromBase16String(); var signedData = key.SignHash(dataToSign, "2.16.840.1.101.3.4.2.1"); e.SignedData = signedData.ToBase16String(); };

FindClose Event (SFTPServer Component)

This event signifies the completion of a custom file listing operation.

Syntax

public event OnFindCloseHandler OnFindClose;

public delegate void OnFindCloseHandler(object sender, SFTPServerFindCloseEventArgs e);

public class SFTPServerFindCloseEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Handle { get; }
  public int OperationStatus { get; set; }
}
Public Event OnFindClose As OnFindCloseHandler

Public Delegate Sub OnFindCloseHandler(sender As Object, e As SFTPServerFindCloseEventArgs)

Public Class SFTPServerFindCloseEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Handle As String
  Public Property OperationStatus As Integer
End Class

Remarks

FindClose notifies your code about the completion of a custom file listing request. Use it in conjunction with FindFirst and FindNext to handle file listing requests manually.

See FindFirst topic for the details on implementing customized file listing request processing.

Set OperationStatus to one of the below values according to the outcome of the request processing:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

FindFirst Event (SFTPServer Component)

This event signifies the start of the custom file listing retrieval mechanism.

Syntax

public event OnFindFirstHandler OnFindFirst;

public delegate void OnFindFirstHandler(object sender, SFTPServerFindFirstEventArgs e);

public class SFTPServerFindFirstEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int OperationStatus { get; set; }
  public string Handle { get; set; }
}
Public Event OnFindFirst As OnFindFirstHandler

Public Delegate Sub OnFindFirstHandler(sender As Object, e As SFTPServerFindFirstEventArgs)

Public Class SFTPServerFindFirstEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property OperationStatus As Integer
  Public Property Handle As String
End Class

Remarks

FindFirst, FindNext, and FindClose events represent a mechanism for providing customized file listings to component. They are only fired if Action parameter of the preceding BeforeFind event was set to fraCustom.

The behaviour of these events mimics that of the standard FindFirst/FindNext/FindClose functions found in many operating systems/frameworks. FindFirst fires once to request the first list entry; FindNext then fires continuously in a loop to request all subsequent entries. To indicate that the listing is over, set OperationStatus parameter to ostEOF. Not doing so may lead to an endless loop and session freeze, as the component would continue firing FindNext infinitely waiting for the EOF marker.

The handlers for both FindFirst and FindNext events should be implemented in the following way: if there are more entries in the directory to pass back to the server component,

When all the entries from the requested directory have been passed to the server component, set OperationStatus to ostEOF. The server will then fire FindClose event to notify your code that the file listing is completed.

Use the by-ref Handle parameter to assign a handle (a unique identifier) to the file listing procedure inside the FindFirst event handler. This identifier will then be passed to all subsequent FindNext and FindClose calls to let your code chain the events together.

The ConnectionID parameter specifies in which SFTP session the request was received, and Path indicates the requested directory.

The following operation status constants are available, besides the ones referenced above:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

FindNext Event (SFTPServer Component)

This event retrieves the next entry of a custom file listing.

Syntax

public event OnFindNextHandler OnFindNext;

public delegate void OnFindNextHandler(object sender, SFTPServerFindNextEventArgs e);

public class SFTPServerFindNextEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Handle { get; }
  public int OperationStatus { get; set; }
}
Public Event OnFindNext As OnFindNextHandler

Public Delegate Sub OnFindNextHandler(sender As Object, e As SFTPServerFindNextEventArgs)

Public Class SFTPServerFindNextEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Handle As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired repeatedly after FindFirst to retrieve the directory contents entry-by-entry. Please see the FindFirst topic for more details about implementing a handler of this event.

Remember to set OperationStatus to ostEOF when there are no more entries left to close the listing operation. If there are more entries to pass, set it to ostOK. Other possible values are given in the table below:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

ListeningStarted Event (SFTPServer Component)

Fires when the server has started accepting connections on a local port.

Syntax

public event OnListeningStartedHandler OnListeningStarted;

public delegate void OnListeningStartedHandler(object sender, SFTPServerListeningStartedEventArgs e);

public class SFTPServerListeningStartedEventArgs : EventArgs {
  public string Host { get; }
  public int Port { get; }
}
Public Event OnListeningStarted As OnListeningStartedHandler

Public Delegate Sub OnListeningStartedHandler(sender As Object, e As SFTPServerListeningStartedEventArgs)

Public Class SFTPServerListeningStartedEventArgs Inherits EventArgs
  Public ReadOnly Property Host As String
  Public ReadOnly Property Port As Integer
End Class

Remarks

This event is fired when the server is ready to accept incoming SSH/SFTP connections.

ListeningStopped Event (SFTPServer Component)

Fires when the server has stopped accepting connections on a local port.

Syntax

public event OnListeningStoppedHandler OnListeningStopped;

public delegate void OnListeningStoppedHandler(object sender, SFTPServerListeningStoppedEventArgs e);

public class SFTPServerListeningStoppedEventArgs : EventArgs {
  public string Host { get; }
  public int Port { get; }
}
Public Event OnListeningStopped As OnListeningStoppedHandler

Public Delegate Sub OnListeningStoppedHandler(sender As Object, e As SFTPServerListeningStoppedEventArgs)

Public Class SFTPServerListeningStoppedEventArgs Inherits EventArgs
  Public ReadOnly Property Host As String
  Public ReadOnly Property Port As Integer
End Class

Remarks

This event is fired when the server has closed the listening socket and can no longer accept incoming SSH/SFTP connections.

Notification Event (SFTPServer Component)

This event notifies the application about an underlying control flow event.

Syntax

public event OnNotificationHandler OnNotification;

public delegate void OnNotificationHandler(object sender, SFTPServerNotificationEventArgs e);

public class SFTPServerNotificationEventArgs : EventArgs {
  public string EventID { get; }
  public string EventParam { get; }
}
Public Event OnNotification As OnNotificationHandler

Public Delegate Sub OnNotificationHandler(sender As Object, e As SFTPServerNotificationEventArgs)

Public Class SFTPServerNotificationEventArgs Inherits EventArgs
  Public ReadOnly Property EventID As String
  Public ReadOnly Property EventParam As String
End Class

Remarks

The component fires this event to let the application know about some event, occurrence, or milestone in the component. For example, it may fire to report completion of the document processing. The list of events being reported is not fixed, and may be flexibly extended over time.

The unique identifier of the event is provided in the EventID parameter. EventParam contains any parameters accompanying the occurrence. Depending on the type of the component, the exact action it is performing, or the document being processed, one or both may be omitted.

This component can fire this event with the following EventID values:

FileOpenNotifies your code about the file being opened, which is typically an indicator of the initiation of the transfer operation. The EventParam value passed with this EventID is a string of the following format:

ConnectionID=3;Path=/dir/file;Handle=x5DshAk8;Modes=48;Access=0;DesiredAccess=8

This EventID only fires if the NotifyOnFileOperations configuration property is set to true.

FileReadNotifies your code about the file chunk being requested. The EventParam value passed with this EventID is a string of the following format:

ConnectionID=7;Handle=x5DshAk8;Offset=2048;Count=1024;Read=1021

This EventID only fires if the NotifyOnFileOperations configuration property is set to true.

FileWriteNotifies your code about the file chunk being received. The EventParam value passed with this EventID is a string of the following format:

ConnectionID=7;Handle=x5DshAk8;Offset=2048;Count=1024

This EventID only fires if the NotifyOnFileOperations configuration property is set to true.

FileCloseNotifies your code about the closure of an opened file. The EventParam value passed with this EventID is a string of the following format:

ConnectionID=7;Handle=x5DshAk8;Modes=48

This EventID only fires if the NotifyOnFileOperations configuration property is set to true.

OpenShellNotifies your code about an opened shell tunnel. The EventParam has the following format: ConnectionID=9;LocalChannel=1;RemoteChannel=2
OpenCommandNotifies your code about an opened command tunnel. The EventParam value has the following format:

ConnectionID=8;LocalChannel=3;RemoteChannel=3;Command=ls -l

CloseShellIndicates the closure of a shell tunnel. The EventParam format is the same as with the OpenShell event ID.
CloseCommandIndicates the closure of a command tunnel. The EventParam format is the same as with the OpenCommand event ID.
BannerNotifies the application that the banner has been prepared and is about to be sent to the other side. The application can adjust the content of the banner by using Banner[ConnID] and Lang[ConnID] configuration settings.
ListeningStartedNotifies the application that the server has started listening for incoming connections.
ListeningStoppedNotifies the application that the server has stopped listening to incoming connections.

OpenClientForwarding Event (SFTPServer Component)

This event is fired when a client opens a client-side (local) forwarding channel.

Syntax

public event OnOpenClientForwardingHandler OnOpenClientForwarding;

public delegate void OnOpenClientForwardingHandler(object sender, SFTPServerOpenClientForwardingEventArgs e);

public class SFTPServerOpenClientForwardingEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string DestHost { get; }
  public int DestPort { get; }
  public string SrcHost { get; }
  public int SrcPort { get; }
}
Public Event OnOpenClientForwarding As OnOpenClientForwardingHandler

Public Delegate Sub OnOpenClientForwardingHandler(sender As Object, e As SFTPServerOpenClientForwardingEventArgs)

Public Class SFTPServerOpenClientForwardingEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property DestHost As String
  Public ReadOnly Property DestPort As Integer
  Public ReadOnly Property SrcHost As String
  Public ReadOnly Property SrcPort As Integer
End Class

Remarks

This event notifies the application that a client-side forwarding channel has been set up. The ConnectionID parameter specifies in which session the request was received.

The DestHost and DestPort parameters specify the address that the data received from the client will be forwarded to. The SrcHost and SrcPort specify the connection origin that is reported by the client. Note that the details of the origin cannot be verified.

OpenCommand Event (SFTPServer Component)

This event is fired when a client has opened an SSH command channel.

Syntax

public event OnOpenCommandHandler OnOpenCommand;

public delegate void OnOpenCommandHandler(object sender, SFTPServerOpenCommandEventArgs e);

public class SFTPServerOpenCommandEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Command { get; }
}
Public Event OnOpenCommand As OnOpenCommandHandler

Public Delegate Sub OnOpenCommandHandler(sender As Object, e As SFTPServerOpenCommandEventArgs)

Public Class SFTPServerOpenCommandEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Command As String
End Class

Remarks

The ConnectionID parameter specifies in which session the request was received.

The component fires CloseCommand when the command channel is closed.

OpenFile Event (SFTPServer Component)

This event instructs the application to handle the file open request.

Syntax

public event OnOpenFileHandler OnOpenFile;

public delegate void OnOpenFileHandler(object sender, SFTPServerOpenFileEventArgs e);

public class SFTPServerOpenFileEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int Modes { get; }
  public int Access { get; }
  public int OperationStatus { get; set; }
  public string Handle { get; set; }
}
Public Event OnOpenFile As OnOpenFileHandler

Public Delegate Sub OnOpenFileHandler(sender As Object, e As SFTPServerOpenFileEventArgs)

Public Class SFTPServerOpenFileEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public ReadOnly Property Modes As Integer
  Public ReadOnly Property Access As Integer
  Public Property OperationStatus As Integer
  Public Property Handle As String
End Class

Remarks

This event is fired when a file open request is received from the client and needs to be handled (virtualized) by the server. The ConnectionID parameter specifies in which session the request was received, and Path specifies the location of the file.

Modes can be a combination of one or several file open mode flags:

cfmRead1
cfmWrite2
cfmAppend4
cfmCreate8
cfmTruncate16
cfmExcl32
cfmText64
cfmOpenOrCreate128
cfmAppendAtomic256
cfmNoFollow512
cfmDeleteOnClose1024

Different client applications may provide different selections of mode flags. For example, some clients specify (cfmCreate + cfmTruncate) when overwriting files, whereas others would specify cfmOpenOrCreate. Please make sure your code is prepared to receive different combinations of flags here and handles them gracefully.

The Access parameter provides additional file access modifiers:

cfaReadLock1
cfaWriteLock2
cfaDeleteLock4
cfaBlockAdvisory8
These parameter may also contain a combination of the above flags. Access modifiers are only supported in SFTPv6, and in practice are rarely used by client applications.

The Handle string represents a unique identifier of the opened file, similar to file handles used in Windows or Unix APIs. Handles are unique across all files opened at the same time. Component generates handles automatically, but you can update the auto-generated values with your own in this event handler (just remember to keep them unique).

Set OperationStatus parameter in accordance with the outcome of the operation to one of the values given below:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

OpenServerForwarding Event (SFTPServer Component)

This event is fired when the server opens a server-side (remote) forwarding channel.

Syntax

public event OnOpenServerForwardingHandler OnOpenServerForwarding;

public delegate void OnOpenServerForwardingHandler(object sender, SFTPServerOpenServerForwardingEventArgs e);

public class SFTPServerOpenServerForwardingEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string LocalHost { get; }
  public int LocalPort { get; }
  public string SrcHost { get; }
  public int SrcPort { get; }
}
Public Event OnOpenServerForwarding As OnOpenServerForwardingHandler

Public Delegate Sub OnOpenServerForwardingHandler(sender As Object, e As SFTPServerOpenServerForwardingEventArgs)

Public Class SFTPServerOpenServerForwardingEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property LocalHost As String
  Public ReadOnly Property LocalPort As Integer
  Public ReadOnly Property SrcHost As String
  Public ReadOnly Property SrcPort As Integer
End Class

Remarks

This event notifies the application that a server-side forwarding channel has been set up. The ConnectionID parameter specifies in which session the request was received.

The DestHost and DestPort parameters specify the address that the data received from the connection accepted by the server will be forwarded to, according to the client. The SrcHost and SrcPort specify the connection origin.

OpenShell Event (SFTPServer Component)

This event is fired when a client has opened a shell channel.

Syntax

public event OnOpenShellHandler OnOpenShell;

public delegate void OnOpenShellHandler(object sender, SFTPServerOpenShellEventArgs e);

public class SFTPServerOpenShellEventArgs : EventArgs {
  public long ConnectionID { get; }
}
Public Event OnOpenShell As OnOpenShellHandler

Public Delegate Sub OnOpenShellHandler(sender As Object, e As SFTPServerOpenShellEventArgs)

Public Class SFTPServerOpenShellEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
End Class

Remarks

The ConnectionID parameter specifies in which session the request was received.

The component fires CloseShell when the shell channel is closed.

ReadFile Event (SFTPServer Component)

This event is fired when a file read request is received.

Syntax

public event OnReadFileHandler OnReadFile;

public delegate void OnReadFileHandler(object sender, SFTPServerReadFileEventArgs e);

public class SFTPServerReadFileEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Handle { get; }
  public long Offset { get; }
  public int Size { get; }
  public int OperationStatus { get; set; }
}
Public Event OnReadFile As OnReadFileHandler

Public Delegate Sub OnReadFileHandler(sender As Object, e As SFTPServerReadFileEventArgs)

Public Class SFTPServerReadFileEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Handle As String
  Public ReadOnly Property Offset As Long
  Public ReadOnly Property Size As Integer
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request to read block from a file is received from the client. The ConnectionID parameter specifies in which session the request was received, and Handle indicates an opened file handle. Offset and Size denote the location and size of the file piece.

Inside the event handler, pass the appropriate file chunk to the component via SetClientBuffer method.

Set OperationStatus to one of the below values according to the outcome of the request processing:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

Remove Event (SFTPServer Component)

This event is fired when a client requests to delete a file or directory.

Syntax

public event OnRemoveHandler OnRemove;

public delegate void OnRemoveHandler(object sender, SFTPServerRemoveEventArgs e);

public class SFTPServerRemoveEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public int OperationStatus { get; set; }
}
Public Event OnRemove As OnRemoveHandler

Public Delegate Sub OnRemoveHandler(sender As Object, e As SFTPServerRemoveEventArgs)

Public Class SFTPServerRemoveEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request to delete a file or directory is received from the client. The ConnectionID parameter specifies in which session the request was received.

Set OperationStatus to one of the below values according to the outcome of the request processing:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

RenameFile Event (SFTPServer Component)

This event is fired when a client requests to rename a file.

Syntax

public event OnRenameFileHandler OnRenameFile;

public delegate void OnRenameFileHandler(object sender, SFTPServerRenameFileEventArgs e);

public class SFTPServerRenameFileEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string OldPath { get; }
  public string NewPath { get; }
  public int OperationStatus { get; set; }
}
Public Event OnRenameFile As OnRenameFileHandler

Public Delegate Sub OnRenameFileHandler(sender As Object, e As SFTPServerRenameFileEventArgs)

Public Class SFTPServerRenameFileEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property OldPath As String
  Public ReadOnly Property NewPath As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request to rename a file (from OldPath to NewPath) is received from the client. The ConnectionID parameter specifies in which session the request was received.

Set OperationStatus to one of the below values according to the outcome of the request processing:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

RequestAttributes Event (SFTPServer Component)

This event is fired when a get file attributes request is received.

Syntax

public event OnRequestAttributesHandler OnRequestAttributes;

public delegate void OnRequestAttributesHandler(object sender, SFTPServerRequestAttributesEventArgs e);

public class SFTPServerRequestAttributesEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public string Handle { get; }
  public int OperationStatus { get; set; }
}
Public Event OnRequestAttributes As OnRequestAttributesHandler

Public Delegate Sub OnRequestAttributesHandler(sender As Object, e As SFTPServerRequestAttributesEventArgs)

Public Class SFTPServerRequestAttributesEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public ReadOnly Property Handle As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request to get file attributes is received from the client. The ConnectionID parameter specifies in which session the request was received, and Path specifies the file location where the attributes need to be retrieved.

Set OperationStatus to one of the below values according to the outcome of the request processing:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

ServerForwardingCancel Event (SFTPServer Component)

This event is fired when the client cancels a previously negotiated server-side (remote) forwarding.

Syntax

public event OnServerForwardingCancelHandler OnServerForwardingCancel;

public delegate void OnServerForwardingCancelHandler(object sender, SFTPServerServerForwardingCancelEventArgs e);

public class SFTPServerServerForwardingCancelEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string LocalHost { get; }
  public int LocalPort { get; }
}
Public Event OnServerForwardingCancel As OnServerForwardingCancelHandler

Public Delegate Sub OnServerForwardingCancelHandler(sender As Object, e As SFTPServerServerForwardingCancelEventArgs)

Public Class SFTPServerServerForwardingCancelEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property LocalHost As String
  Public ReadOnly Property LocalPort As Integer
End Class

Remarks

The ConnectionID parameter specifies in which session the request was received. The LocalHost:LocalPort specify the endpoint that the server is listening on.

After receiving the cancellation request the server will no longer listen to connections at the mentioned endpoint.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

ServerForwardingOpenFailed Event (SFTPServer Component)

This event is fired when the client rejects the server request to establish a server forwarding channel.

Syntax

public event OnServerForwardingOpenFailedHandler OnServerForwardingOpenFailed;

public delegate void OnServerForwardingOpenFailedHandler(object sender, SFTPServerServerForwardingOpenFailedEventArgs e);

public class SFTPServerServerForwardingOpenFailedEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string LocalHost { get; }
  public int LocalPort { get; }
  public string SrcHost { get; }
  public int SrcPort { get; }
}
Public Event OnServerForwardingOpenFailed As OnServerForwardingOpenFailedHandler

Public Delegate Sub OnServerForwardingOpenFailedHandler(sender As Object, e As SFTPServerServerForwardingOpenFailedEventArgs)

Public Class SFTPServerServerForwardingOpenFailedEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property LocalHost As String
  Public ReadOnly Property LocalPort As Integer
  Public ReadOnly Property SrcHost As String
  Public ReadOnly Property SrcPort As Integer
End Class

Remarks

This event can follow the BeforeOpenServerForwarding and OpenServerForwarding if the client rejects the server request to forward an accepted TCP connection.

The ConnectionID parameter specifies in which session the request was received. The LocalHost:LocalPort specify the endpoint that the server has received the connection on.

ServerForwardingRequest Event (SFTPServer Component)

This event is fired when the client requests the server to set up server-side (remote) forwarding.

Syntax

public event OnServerForwardingRequestHandler OnServerForwardingRequest;

public delegate void OnServerForwardingRequestHandler(object sender, SFTPServerServerForwardingRequestEventArgs e);

public class SFTPServerServerForwardingRequestEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string LocalHost { get; }
  public int LocalPort { get; set; }
  public int Action { get; set; }
}
Public Event OnServerForwardingRequest As OnServerForwardingRequestHandler

Public Delegate Sub OnServerForwardingRequestHandler(sender As Object, e As SFTPServerServerForwardingRequestEventArgs)

Public Class SFTPServerServerForwardingRequestEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property LocalHost As String
  Public Property LocalPort As Integer
  Public Property Action As Integer
End Class

Remarks

The ConnectionID parameter specifies in which session the request was received. The LocalHost:LocalPort specify the endpoint that the client expects the server to listen on. The server may choose to use a different port, in which case please adjust the LocalPort in the event handler.

If permitted, the server will open the requested port and start listening to incoming connections. All such connections will be reported via BeforeOpenServerForwarding and OpenServerForwarding events.

You can enable or disable server forwarding blanketly via the Capabilities property.

Choose Action as one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

SessionClosed Event (SFTPServer Component)

Reports session closure.

Syntax

public event OnSessionClosedHandler OnSessionClosed;

public delegate void OnSessionClosedHandler(object sender, SFTPServerSessionClosedEventArgs e);

public class SFTPServerSessionClosedEventArgs : EventArgs {
  public long ConnectionID { get; }
}
Public Event OnSessionClosed As OnSessionClosedHandler

Public Delegate Sub OnSessionClosedHandler(sender As Object, e As SFTPServerSessionClosedEventArgs)

Public Class SFTPServerSessionClosedEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
End Class

Remarks

This event is fired when a connection identified by ConnectionID has been gracefully closed.

SessionEstablished Event (SFTPServer Component)

This event is fired when a new session is established.

Syntax

public event OnSessionEstablishedHandler OnSessionEstablished;

public delegate void OnSessionEstablishedHandler(object sender, SFTPServerSessionEstablishedEventArgs e);

public class SFTPServerSessionEstablishedEventArgs : EventArgs {
  public long ConnectionID { get; }
}
Public Event OnSessionEstablished As OnSessionEstablishedHandler

Public Delegate Sub OnSessionEstablishedHandler(sender As Object, e As SFTPServerSessionEstablishedEventArgs)

Public Class SFTPServerSessionEstablishedEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
End Class

Remarks

This event is fired when a new connection identified by ConnectionID has been established with a client.

SetAttributes Event (SFTPServer Component)

This event is fired when an set file attributes request is received.

Syntax

public event OnSetAttributesHandler OnSetAttributes;

public delegate void OnSetAttributesHandler(object sender, SFTPServerSetAttributesEventArgs e);

public class SFTPServerSetAttributesEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public string Handle { get; }
  public int OperationStatus { get; set; }
}
Public Event OnSetAttributes As OnSetAttributesHandler

Public Delegate Sub OnSetAttributesHandler(sender As Object, e As SFTPServerSetAttributesEventArgs)

Public Class SFTPServerSetAttributesEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public ReadOnly Property Handle As String
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request to set file attributes is received from the client. The ConnectionID parameter specifies in which session the request was received, and Path specifies the file location which the attributes needs to be set.

Set OperationStatus to one of the below values according to the outcome of the request processing:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

TranslatePath Event (SFTPServer Component)

This event is fired when a client requests the server to translate a path to its absolute form.

Syntax

public event OnTranslatePathHandler OnTranslatePath;

public delegate void OnTranslatePathHandler(object sender, SFTPServerTranslatePathEventArgs e);

public class SFTPServerTranslatePathEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Path { get; }
  public string AbsolutePath { get; set; }
  public int Action { get; set; }
}
Public Event OnTranslatePath As OnTranslatePathHandler

Public Delegate Sub OnTranslatePathHandler(sender As Object, e As SFTPServerTranslatePathEventArgs)

Public Class SFTPServerTranslatePathEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Path As String
  Public Property AbsolutePath As String
  Public Property Action As Integer
End Class

Remarks

This event is fired when a request to translate a relative path to the corresponding absolute path is received. The ConnectionID parameter specifies the session in which the request was received.

You can let the server do the translation automatically according to the default file system rules, or take care of it yourself. Use the Action parameter to specify who is responsible for the translation. If doing the translation manually, return the translated path via the AbsolutePath parameter. Action can take one of the following values:

fraAuto1Handle the requested action automatically by the server

fraCustom2Override the action using the user code logic

fraAbort3Abort the requested action

WriteFile Event (SFTPServer Component)

This event is fired when a file write request is received.

Syntax

public event OnWriteFileHandler OnWriteFile;

public delegate void OnWriteFileHandler(object sender, SFTPServerWriteFileEventArgs e);

public class SFTPServerWriteFileEventArgs : EventArgs {
  public long ConnectionID { get; }
  public string Handle { get; }
  public long Offset { get; }
  public int OperationStatus { get; set; }
}
Public Event OnWriteFile As OnWriteFileHandler

Public Delegate Sub OnWriteFileHandler(sender As Object, e As SFTPServerWriteFileEventArgs)

Public Class SFTPServerWriteFileEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionID As Long
  Public ReadOnly Property Handle As String
  Public ReadOnly Property Offset As Long
  Public Property OperationStatus As Integer
End Class

Remarks

This event is fired when a request to write a data block to a file is received from the client. The ConnectionID parameter specifies the session the request originates from. The Handle parameter references the opened file where the block should be written to. Offset references the position in the file where the block of data should be written.

Use GetClientBuffer method to obtain the piece of data that should be written to the file.

Set OperationStatus to one of the below values according to the outcome of the request processing:

ostOk1
ostNoSuchFile2
ostAccessDenied3
ostWriteProtect4
ostUnsupported5
ostInvalidParameter6
ostEOF7

ExternalCrypto Type

Specifies the parameters of external cryptographic calls.

Remarks

External cryptocalls are used in a Distributed Cryptography (DC) subsystem, which allows the delegation of security operations to the remote agent. For instance, it can be used to compute the signature value on the server, while retaining the client's private key locally.

The following fields are available:

Fields

AsyncDocumentID
string

Default: ""

Specifies an optional document ID for SignAsyncBegin() and SignAsyncEnd() calls.

Use this property when working with multi-signature DCAuth requests and responses to uniquely identify documents signed within a larger batch. On the completion stage, this value helps the signing component identify the correct signature in the returned batch of responses.

If using batched requests, make sure to set this property to the same value on both the pre-signing (SignAsyncBegin) and completion (SignAsyncEnd) stages.

CustomParams
string

Default: ""

Custom parameters to be passed to the signing service (uninterpreted).

Data
string

Default: ""

Additional data to be included in the async state and mirrored back by the requestor.

ExternalHashCalculation
bool

Default: False

Specifies whether the message hash is to be calculated at the external endpoint. Please note that this mode is not supported by the DCAuth component.

If set to true, the component will pass a few kilobytes of to-be-signed data from the document to the OnExternalSign event. This only applies when SignExternal() is called.

HashAlgorithm
string

Default: "SHA256"

Specifies the request's signature hash algorithm.

SB_HASH_ALGORITHM_SHA1SHA1
SB_HASH_ALGORITHM_SHA224SHA224
SB_HASH_ALGORITHM_SHA256SHA256
SB_HASH_ALGORITHM_SHA384SHA384
SB_HASH_ALGORITHM_SHA512SHA512
SB_HASH_ALGORITHM_MD2MD2
SB_HASH_ALGORITHM_MD4MD4
SB_HASH_ALGORITHM_MD5MD5
SB_HASH_ALGORITHM_RIPEMD160RIPEMD160
SB_HASH_ALGORITHM_CRC32CRC32
SB_HASH_ALGORITHM_SSL3SSL3
SB_HASH_ALGORITHM_GOST_R3411_1994GOST1994
SB_HASH_ALGORITHM_WHIRLPOOLWHIRLPOOL
SB_HASH_ALGORITHM_POLY1305POLY1305
SB_HASH_ALGORITHM_SHA3_224SHA3_224
SB_HASH_ALGORITHM_SHA3_256SHA3_256
SB_HASH_ALGORITHM_SHA3_384SHA3_384
SB_HASH_ALGORITHM_SHA3_512SHA3_512
SB_HASH_ALGORITHM_BLAKE2S_128BLAKE2S_128
SB_HASH_ALGORITHM_BLAKE2S_160BLAKE2S_160
SB_HASH_ALGORITHM_BLAKE2S_224BLAKE2S_224
SB_HASH_ALGORITHM_BLAKE2S_256BLAKE2S_256
SB_HASH_ALGORITHM_BLAKE2B_160BLAKE2B_160
SB_HASH_ALGORITHM_BLAKE2B_256BLAKE2B_256
SB_HASH_ALGORITHM_BLAKE2B_384BLAKE2B_384
SB_HASH_ALGORITHM_BLAKE2B_512BLAKE2B_512
SB_HASH_ALGORITHM_SHAKE_128SHAKE_128
SB_HASH_ALGORITHM_SHAKE_256SHAKE_256
SB_HASH_ALGORITHM_SHAKE_128_LENSHAKE_128_LEN
SB_HASH_ALGORITHM_SHAKE_256_LENSHAKE_256_LEN

KeyID
string

Default: ""

The ID of the pre-shared key used for DC request authentication.

Asynchronous DCAuth-driven communication requires that parties authenticate each other with a secret pre-shared cryptographic key. This provides an extra protection layer for the protocol and diminishes the risk of the private key becoming abused by foreign parties. Use this property to provide the pre-shared key identifier, and use KeySecret to pass the key itself.

The same KeyID/KeySecret pair should be used on the DCAuth side for the signing requests to be accepted.

Note: The KeyID/KeySecret scheme is very similar to the AuthKey scheme used in various Cloud service providers to authenticate users.

Example: signer.ExternalCrypto.KeyID = "MainSigningKey"; signer.ExternalCrypto.KeySecret = "abcdef0123456789";

KeySecret
string

Default: ""

The pre-shared key used for DC request authentication. This key must be set and match the key used by the DCAuth counterpart for the scheme to work.

Read more about configuring authentication in the KeyID topic.

Method
AsyncSignMethods

Default: 0

Specifies the asynchronous signing method. This is typically defined by the DC server capabilities and setup.

Available options:

asmdPKCS10
asmdPKCS71

Mode
ExternalCryptoModes

Default: 0

Specifies the external cryptography mode.

Available options:

ecmDefaultThe default value (0)
ecmDisabledDo not use DC or external signing (1)
ecmGenericGeneric external signing with the OnExternalSign event (2)
ecmDCAuthDCAuth signing (3)
ecmDCAuthJSONDCAuth signing in JSON format (4)

PublicKeyAlgorithm
string

Default: ""

Provide the public key algorithm here if the certificate is not available on the pre-signing stage.

SB_CERT_ALGORITHM_ID_RSA_ENCRYPTIONrsaEncryption
SB_CERT_ALGORITHM_MD2_RSA_ENCRYPTIONmd2withRSAEncryption
SB_CERT_ALGORITHM_MD5_RSA_ENCRYPTIONmd5withRSAEncryption
SB_CERT_ALGORITHM_SHA1_RSA_ENCRYPTIONsha1withRSAEncryption
SB_CERT_ALGORITHM_ID_DSAid-dsa
SB_CERT_ALGORITHM_ID_DSA_SHA1id-dsa-with-sha1
SB_CERT_ALGORITHM_DH_PUBLICdhpublicnumber
SB_CERT_ALGORITHM_SHA224_RSA_ENCRYPTIONsha224WithRSAEncryption
SB_CERT_ALGORITHM_SHA256_RSA_ENCRYPTIONsha256WithRSAEncryption
SB_CERT_ALGORITHM_SHA384_RSA_ENCRYPTIONsha384WithRSAEncryption
SB_CERT_ALGORITHM_SHA512_RSA_ENCRYPTIONsha512WithRSAEncryption
SB_CERT_ALGORITHM_ID_RSAPSSid-RSASSA-PSS
SB_CERT_ALGORITHM_ID_RSAOAEPid-RSAES-OAEP
SB_CERT_ALGORITHM_RSASIGNATURE_RIPEMD160ripemd160withRSA
SB_CERT_ALGORITHM_ID_ELGAMALelGamal
SB_CERT_ALGORITHM_SHA1_ECDSAecdsa-with-SHA1
SB_CERT_ALGORITHM_RECOMMENDED_ECDSAecdsa-recommended
SB_CERT_ALGORITHM_SHA224_ECDSAecdsa-with-SHA224
SB_CERT_ALGORITHM_SHA256_ECDSAecdsa-with-SHA256
SB_CERT_ALGORITHM_SHA384_ECDSAecdsa-with-SHA384
SB_CERT_ALGORITHM_SHA512_ECDSAecdsa-with-SHA512
SB_CERT_ALGORITHM_ECid-ecPublicKey
SB_CERT_ALGORITHM_SPECIFIED_ECDSAecdsa-specified
SB_CERT_ALGORITHM_GOST_R3410_1994id-GostR3410-94
SB_CERT_ALGORITHM_GOST_R3410_2001id-GostR3410-2001
SB_CERT_ALGORITHM_GOST_R3411_WITH_R3410_1994id-GostR3411-94-with-GostR3410-94
SB_CERT_ALGORITHM_GOST_R3411_WITH_R3410_2001id-GostR3411-94-with-GostR3410-2001
SB_CERT_ALGORITHM_SHA1_ECDSA_PLAINecdsa-plain-SHA1
SB_CERT_ALGORITHM_SHA224_ECDSA_PLAINecdsa-plain-SHA224
SB_CERT_ALGORITHM_SHA256_ECDSA_PLAINecdsa-plain-SHA256
SB_CERT_ALGORITHM_SHA384_ECDSA_PLAINecdsa-plain-SHA384
SB_CERT_ALGORITHM_SHA512_ECDSA_PLAINecdsa-plain-SHA512
SB_CERT_ALGORITHM_RIPEMD160_ECDSA_PLAINecdsa-plain-RIPEMD160
SB_CERT_ALGORITHM_WHIRLPOOL_RSA_ENCRYPTIONwhirlpoolWithRSAEncryption
SB_CERT_ALGORITHM_ID_DSA_SHA224id-dsa-with-sha224
SB_CERT_ALGORITHM_ID_DSA_SHA256id-dsa-with-sha256
SB_CERT_ALGORITHM_SHA3_224_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-sha3-224
SB_CERT_ALGORITHM_SHA3_256_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-sha3-256
SB_CERT_ALGORITHM_SHA3_384_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-sha3-384
SB_CERT_ALGORITHM_SHA3_512_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-sha3-512
SB_CERT_ALGORITHM_SHA3_224_ECDSAid-ecdsa-with-sha3-224
SB_CERT_ALGORITHM_SHA3_256_ECDSAid-ecdsa-with-sha3-256
SB_CERT_ALGORITHM_SHA3_384_ECDSAid-ecdsa-with-sha3-384
SB_CERT_ALGORITHM_SHA3_512_ECDSAid-ecdsa-with-sha3-512
SB_CERT_ALGORITHM_SHA3_224_ECDSA_PLAINid-ecdsa-plain-with-sha3-224
SB_CERT_ALGORITHM_SHA3_256_ECDSA_PLAINid-ecdsa-plain-with-sha3-256
SB_CERT_ALGORITHM_SHA3_384_ECDSA_PLAINid-ecdsa-plain-with-sha3-384
SB_CERT_ALGORITHM_SHA3_512_ECDSA_PLAINid-ecdsa-plain-with-sha3-512
SB_CERT_ALGORITHM_ID_DSA_SHA3_224id-dsa-with-sha3-224
SB_CERT_ALGORITHM_ID_DSA_SHA3_256id-dsa-with-sha3-256
SB_CERT_ALGORITHM_BLAKE2S_128_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-blake2s128
SB_CERT_ALGORITHM_BLAKE2S_160_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-blake2s160
SB_CERT_ALGORITHM_BLAKE2S_224_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-blake2s224
SB_CERT_ALGORITHM_BLAKE2S_256_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-blake2s256
SB_CERT_ALGORITHM_BLAKE2B_160_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-blake2b160
SB_CERT_ALGORITHM_BLAKE2B_256_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-blake2b256
SB_CERT_ALGORITHM_BLAKE2B_384_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-blake2b384
SB_CERT_ALGORITHM_BLAKE2B_512_RSA_ENCRYPTIONid-rsassa-pkcs1-v1_5-with-blake2b512
SB_CERT_ALGORITHM_BLAKE2S_128_ECDSAid-ecdsa-with-blake2s128
SB_CERT_ALGORITHM_BLAKE2S_160_ECDSAid-ecdsa-with-blake2s160
SB_CERT_ALGORITHM_BLAKE2S_224_ECDSAid-ecdsa-with-blake2s224
SB_CERT_ALGORITHM_BLAKE2S_256_ECDSAid-ecdsa-with-blake2s256
SB_CERT_ALGORITHM_BLAKE2B_160_ECDSAid-ecdsa-with-blake2b160
SB_CERT_ALGORITHM_BLAKE2B_256_ECDSAid-ecdsa-with-blake2b256
SB_CERT_ALGORITHM_BLAKE2B_384_ECDSAid-ecdsa-with-blake2b384
SB_CERT_ALGORITHM_BLAKE2B_512_ECDSAid-ecdsa-with-blake2b512
SB_CERT_ALGORITHM_BLAKE2S_128_ECDSA_PLAINid-ecdsa-plain-with-blake2s128
SB_CERT_ALGORITHM_BLAKE2S_160_ECDSA_PLAINid-ecdsa-plain-with-blake2s160
SB_CERT_ALGORITHM_BLAKE2S_224_ECDSA_PLAINid-ecdsa-plain-with-blake2s224
SB_CERT_ALGORITHM_BLAKE2S_256_ECDSA_PLAINid-ecdsa-plain-with-blake2s256
SB_CERT_ALGORITHM_BLAKE2B_160_ECDSA_PLAINid-ecdsa-plain-with-blake2b160
SB_CERT_ALGORITHM_BLAKE2B_256_ECDSA_PLAINid-ecdsa-plain-with-blake2b256
SB_CERT_ALGORITHM_BLAKE2B_384_ECDSA_PLAINid-ecdsa-plain-with-blake2b384
SB_CERT_ALGORITHM_BLAKE2B_512_ECDSA_PLAINid-ecdsa-plain-with-blake2b512
SB_CERT_ALGORITHM_ID_DSA_BLAKE2S_224id-dsa-with-blake2s224
SB_CERT_ALGORITHM_ID_DSA_BLAKE2S_256id-dsa-with-blake2s256
SB_CERT_ALGORITHM_EDDSA_ED25519id-Ed25519
SB_CERT_ALGORITHM_EDDSA_ED448id-Ed448
SB_CERT_ALGORITHM_EDDSA_ED25519_PHid-Ed25519ph
SB_CERT_ALGORITHM_EDDSA_ED448_PHid-Ed448ph
SB_CERT_ALGORITHM_EDDSAid-EdDSA
SB_CERT_ALGORITHM_EDDSA_SIGNATUREid-EdDSA-sig

Constructors

public ExternalCrypto();
Public ExternalCrypto()

Creates a new ExternalCrypto object with default field values.

FTPListEntry Type

Represents a basic container for the remote file details.

Remarks

The component represents the details of a file entry returned by the FTP server.

The following fields are available:

Fields

AccessTime
string

Default: ""

Contains the last access time for this file, in UTC.

CreationTime
string

Default: ""

Contains this file's creation time, in UTC.

EntryFormat
FTPFileFormats

Default: 0

The file listing format:

cfefUnknown0
cfefUnix1
cfefWindows2
cfefMLSD3

FileType
FTPFileTypes

Default: 0

The type of the entry:

fetUnknown0
fetDirectory1
fetFile2
fetSymlink3
fetSpecial4
fetCurrentDirectory5
fetParentDirectory6
fetSocket7
fetCharDevice8
fetBlockDevice9
fetFIFO10

ModificationTime
string

Default: ""

File last modification date/time.

Name
string

Default: ""

The file or directory name.

Path
string

Default: ""

The full path to the file or directory.

Principal
string

Default: ""

Specifies the owner of the file/directory.

Note: in earlier versions this property was called Owner. It was renamed to Principal to avoid clashes with certain SDK namings.

Size
long

Default: 0

File size in bytes.

UnixPerms
int

Default: 511

The file Unix permissions bit mask (e.g. rwxrwxrwx=511 (0777); rwxr--r--=484 (0744)).

UnparsedName
string

Default: ""

The unparsed entry as returned by the server. Sometimes this is also known as "long name".

Constructors

public FTPListEntry();
Public FTPListEntry()

Creates a new FTPListEntry object.

SocketSettings Type

A container for the socket settings.

Remarks

This type is a container for socket-layer parameters.

The following fields are available:

Fields

DNSMode
DNSResolveModes

Default: 0

Selects the DNS resolver to use: the component's (secure) built-in one, or the one provided by the system.

dmAuto0
dmPlatform1
dmOwn2
dmOwnSecure3

DNSPort
int

Default: 0

Specifies the port number to be used for sending queries to the DNS server.

DNSQueryTimeout
int

Default: 0

The timeout (in milliseconds) for each DNS query. The value of 0 indicates an infinite timeout.

DNSServers
string

Default: ""

The addresses of DNS servers to use for address resolution, separated by commas or semicolons.

DNSTotalTimeout
int

Default: 0

The timeout (in milliseconds) for the whole resolution process. The value of 0 indicates an infinite timeout.

IncomingSpeedLimit
int

Default: 0

The maximum number of bytes to read from the socket, per second.

LocalAddress
string

Default: ""

The local network interface to bind the socket to.

LocalPort
int

Default: 0

The local port number to bind the socket to.

OutgoingSpeedLimit
int

Default: 0

The maximum number of bytes to write to the socket, per second.

Timeout
int

Default: 60000

The maximum period of waiting, in milliseconds, after which the socket operation is considered unsuccessful.

If Timeout is set to 0, a socket operation will expire after the system-default timeout (2 hrs 8 min for TCP stack).

UseIPv6
bool

Default: False

Enables or disables IP protocol version 6.

Constructors

public SocketSettings();
Public SocketSettings()

Creates a new SocketSettings object.

SSHConnectionInfo Type

Contains information about SSH connection.

Remarks

SSHConnectionInfo object contains information about one SSH connection.

The following fields are available:

Fields

ClientKeyAlgorithm
string (read-only)

Default: ""

Specifies the client's key algorithm.

ClientKeyBits
int (read-only)

Default: 0

Specifies the length of the client's key.

ClientKeyFingerprint
string (read-only)

Default: ""

The fingerprint (hash value) of the client's public key.

CloseReason
string (read-only)

Default: ""

Contains the line sent by the server just before closing the connection. It might contain the error description if the connection was not closed gracefully.

CompressionAlgorithmInbound
string (read-only)

Default: ""

Compression algorithm for the incoming traffic.

CompressionAlgorithmOutbound
string (read-only)

Default: ""

Compression algorithm for the outgoing traffic.

EncryptionAlgorithmInbound
string (read-only)

Default: ""

Encryption algorithm for the incoming traffic.

EncryptionAlgorithmOutbound
string (read-only)

Default: ""

Encryption algorithm for the outgoing traffic.

InboundEncryptionKeyBits
int (read-only)

Default: 0

Specifies the length of the key used to encrypt the incoming traffic.

KexAlgorithm
string (read-only)

Default: ""

The key exchange algorithm used during the SSH handshake.

KexBits
int (read-only)

Default: 0

The number of bits used by the key exchange algorithm.

KexLines
string (read-only)

Default: ""

The contents of the received KexInit packet.

KexInit packet contains the list of algorithms supported by the remote party.

MacAlgorithmInbound
string (read-only)

Default: ""

MAC algorithm used for the incoming connection.

MacAlgorithmOutbound
string (read-only)

Default: ""

MAC algorithm used for outbound connection.

OutboundEncryptionKeyBits
int (read-only)

Default: 0

Specifies the length of the key used to encrypt the outgoing traffic.

PublicKeyAlgorithm
string (read-only)

Default: ""

Specifies the public key algorithm which was used during the SSH handshake.

RemoteAddress
string (read-only)

Default: ""

The client's IP address.

RemotePort
int (read-only)

Default: 0

The remote port of the client connection.

ServerKeyAlgorithm
string (read-only)

Default: ""

Specifies the server's key algorithm.

ServerKeyBits
int (read-only)

Default: 0

Specifies the number of bits in the server's key.

ServerKeyFingerprint
string (read-only)

Default: ""

The fingerprint (hash value) of the server's public key.

ServerSoftwareName
string (read-only)

Default: ""

Returns the name of the SSH software running on the server side.

TotalBytesReceived
long (read-only)

Default: 0

Returns the total number of bytes received over this connection.

TotalBytesSent
long (read-only)

Default: 0

Returns the total number of bytes sent over this connection.

Version
int (read-only)

Default: 2

Specifies SSH protocol version.

Constructors

Creates an empty object representing a SSH connection info.

SSHKey Type

SSHKey is used to store information about single compound public-key algorithm (such as RSA or DSA) key.

Remarks

SSH keys are used to secure the SSH protocol flow. They support different algorithms and key lengths, a very typical example being RSA-2048 bits.

The following fields are available:

Fields

Algorithm
string (read-only)

Default: ""

Specifies the key algorithm.

Bits
int (read-only)

Default: 0

The number of bits in the key: the more the better, 2048 or 4096 are typical values.

Comment
string

Default: ""

The comment for the public key.

Curve
string (read-only)

Default: ""

Specifies the elliptical curve when EC cryptography is used.

DSSG
byte[] (read-only)

Default: ""

The G (Generator) parameter of the DSS signature key. The string should contain the binary data of G.

DSSP
byte[] (read-only)

Default: ""

The P (Prime) parameter of the DSS signature key. The string should contain the binary data of P.

DSSQ
byte[] (read-only)

Default: ""

The Q (Prime Factor) parameter of the DSS signature key. The string should contain the binary data of Q.

DSSX
byte[] (read-only)

Default: ""

The X (Private key) parameter of the DSS signature key. The string should contain the binary data of X.

This parameter may be empty if there's no need to sign data with this key (e.g. if the key is a server public key needed only to authenticate the server).

DSSY
byte[] (read-only)

Default: ""

The Y (Public key) parameter of the DSS signature key. The string should contain the binary data of Y.

ECCD
byte[] (read-only)

Default: ""

The value of the secret key (the order of the public key, D) if elliptic curve (EC) cryptography is used. The string should contain the binary data of D.

ECCQX
byte[] (read-only)

Default: ""

The value of the X coordinate of the public key if elliptic curve (EC) cryptography is used. The string should contain the binary data of X.

ECCQY
byte[] (read-only)

Default: ""

The value of the Y coordinate of the public key if elliptic curve (EC) cryptography is used. The string should contain the binary data of Y.

EdPrivate
byte[] (read-only)

Default: ""

The value of the private key if EdDSA (Edwards-curve Digital Signature Algorithm) algorithm is used.

EdPublic
byte[] (read-only)

Default: ""

The value of the public key if EdDSA (Edwards-curve Digital Signature Algorithm) algorithm is used.

FingerprintMD5
string (read-only)

Default: ""

Contains the MD5 fingerprint (hash) of the key.

FingerprintSHA1
string (read-only)

Default: ""

Contains the SHA-1 fingerprint (hash) of the key.

FingerprintSHA256
string (read-only)

Default: ""

Contains the SHA-256 fingerprint (hash) of the key.

IsExtractable
bool (read-only)

Default: False

Whether the key is extractable (e.g., from a security token), or not.

IsPrivate
bool (read-only)

Default: False

Whether this key is a private key or not.

IsPublic
bool (read-only)

Default: False

Whether this key is a public key or not.

KDFRounds
int (read-only)

Default: 0

Returns the number of iterations of the Key Derivation Function (KDF) used to generate this key.

KDFSalt
byte[] (read-only)

Default: ""

The salt value used by the Key Derivation Function (KDF) to generate this key.

KeyFormat
SSHKeyFormats (read-only)

Default: 0

Specifies the format in which the key is stored.

ckfOpenSSH0
ckfOpenSSH21
ckfIETF2
ckfPuTTY3
ckfX5094
ckfBinary5
ckfSSH16
ckfPGP7
ckfPKCS88
ckfPuTTY39

KeyProtectionAlgorithm
string (read-only)

Default: ""

Specifies the key protection algorithm.

RSAExponent
byte[] (read-only)

Default: ""

Returns the e parameter (public exponent) of the RSA key.

RSAIQMP
byte[] (read-only)

Default: ""

Returns the iqmp parameter of the RSA key.

RSAModulus
byte[] (read-only)

Default: ""

Returns the m parameter (public modulus) of the RSA key.

RSAP
byte[] (read-only)

Default: ""

Returns the p parameter (first factor of the common modulus n) of the RSA key.

RSAPrivateExponent
byte[] (read-only)

Default: ""

Returns the d parameter (private exponent) of the RSA key.

RSAQ
byte[] (read-only)

Default: ""

Returns the q parameter (second factor of the common modulus n) of the RSA key.

Subject
string

Default: ""

Specifies the public key owner (subject). This property is used only for IETF-keys.

Constructors

public SSHKey(byte[] bytes, int startIndex, int count, string password);
Public SSHKey(ByVal Bytes As Byte(), ByVal StartIndex As Integer, ByVal Count As Integer, ByVal Password As String)

Loads private key from the Bytes buffer. Parameters StartIndex and Count specify the starting index of the key data and its length, correspondingly. Provide a Password to decrypt the key.

public SSHKey(byte[] bytes, int startIndex, int count);
Public SSHKey(ByVal Bytes As Byte(), ByVal StartIndex As Integer, ByVal Count As Integer)

Loads public key from the Bytes buffer. Parameters StartIndex and Count specify the starting index of the key data and its length, correspondingly.

public SSHKey(System.IO.Stream stream, string password);
Public SSHKey(ByVal Stream As System.IO.Stream, ByVal Password As String)

Loads private key from the stream. Provide a Password to decrypt the key.

public SSHKey(System.IO.Stream stream);
Public SSHKey(ByVal Stream As System.IO.Stream)

Loads public key from the stream.

public SSHKey(string path, string password);
Public SSHKey(ByVal Path As String, ByVal Password As String)

Loads private key from the file. Provide a Path to the file and Password to decrypt the key.

public SSHKey(string path);
Public SSHKey(ByVal Path As String)

Loads public key from the file specified by Path .

public SSHKey();
Public SSHKey()

Creates a new key.

SSHSettings Type

A container for various SSH protocol settings.

Remarks

SSHSettings stores various settings of SSH client or server.

The following fields are available:

Fields

AutoAdjustCiphers
bool

Default: True

Whether the SSH client should adjust its list of supported ciphers 'on-the-fly' for greater compatibility with the server it is connecting to.

BaseConfiguration
SecureTransportPredefinedConfigurations

Default: 0

Allows to choose base configuration of SSH settings, tuned up for different purposes such as high security or higher compatibility.

CompressionAlgorithms
string

Default: ""

A list of session compression algorithms separated with commas or semicolons. Each algorithm in the list may be prefixed with a minus sign (-) to indicate that the algorithm should be disabled rather than enabled. Besides the specific algorithm names, this property supports the all (and -all) aliases that allow to blanketly enable or disable all compression algorithms at once.

Note: the list of algorithms provided to this property alters the baseline list of compression algorithms pre-configured for this component. Remember to start your algorithm string with -all; if you need to only enable a specific fixed set of algorithms. The list of supported compression algorithms is provided below:

  • none
  • zlib
  • zlib@openssh.com

CompressionLevel
int

Default: 6

Possible values for the Compression Level range from 0 (minimum compression) to 9 (maximum compression). This setting is ignored if compression wasn't accepted.

DefaultWindowSize
int

Default: 2048000

The SSH window size specifies how many bytes the client can send to the server in the command channel without obtaining pre-authorization for the further send from the server.

EncryptionAlgorithms
string

Default: ""

A list of session encryption algorithms separated with commas or semicolons. Each algorithm in the list may be prefixed with a minus sign (-) to indicate that the algorithm should be disabled rather than enabled. Besides the specific algorithm names, this property supports the all (and -all) aliases that allow to blanketly enable or disable all encryption algorithms at once.

Note: the list of algorithms provided to this property alters the baseline list of encryption algorithms pre-configured for this component. Remember to start your algorithm string with -all; if you need to only enable a specific fixed set of algorithms. The list of supported encryption algorithms is provided below:

  • 3des-cbc
  • blowfish-cbc
  • twofish256-cbc
  • twofish192-cbc
  • twofish128-cbc
  • aes256-cbc
  • aes192-cbc
  • aes128-cbc
  • serpent256-cbc
  • serpent192-cbc
  • serpent128-cbc
  • arcfour
  • idea-cbc
  • cast128-cbc
  • none
  • des-cbc
  • aes128-ctr
  • aes192-ctr
  • aes256-ctr
  • 3des-ctr
  • blowfish-ctr
  • twofish128-ctr
  • twofish192-ctr
  • twofish256-ctr
  • serpent128-ctr
  • serpent192-ctr
  • serpent256-ctr
  • idea-ctr
  • cast128-ctr
  • arcfour128
  • arcfour256
  • aes128-gcm
  • aes256-gcm
  • aes128-gcm@openssh.com
  • aes256-gcm@openssh.com
  • chacha20-poly1305
  • chacha20-poly1305@openssh.com

ForceCompression
bool

Default: False

Whether the SSH client should explicitly request compression.

If ForceCompression is False, compression will be used only if the server doesn't support algorithms without compression.

ForwardAuthAgent
bool

Default: False

Enables or disables auth agent forwarding. This allows the component to connect to the second and subsequent servers in the chain with the key agent available on the client computer.

GSSAuthTypes
string

Default: ""

A comma-separated list of authentication types. Two types are currently supported: gssapi-with-mic and gssapi-keyex.

GSSDelegateCreds
bool

Default: False

Switches credential delegation on or off.

GSSHostname
string

Default: ""

The GSS host name, in form of a FQDN (e.g. hostname.com), a principal name (e.g. 'host@hostname.com), or a cross-real ticket-granting ticket (e.g. krbtgt/test.com@example.com).

GSSLib
string

Default: ""

A path to the GSS-API library (DLL or SO).

GSSMechanisms
string

Default: ""

A comma-separated list of GSS mechanisms to use. Two values are currently supported: lib and SSPI.

GSSProtocols
string

Default: ""

A comma-separated list of SSPI protocols. Two protocols are currently supported: kerberos and NTLM.

HandshakeTimeout
int

Default: 45

Specifies the maximal time for the SSH handshake to proceed, in seconds. If the handshake is not completed within this period, the session is aborted.

KexAlgorithms
string

Default: ""

A list of key exchange algorithms separated with commas or semicolons. Each algorithm in the list may be prefixed with a minus sign (-) to indicate that the algorithm should be disabled rather than enabled. Besides the specific algorithm names, this property supports the all (and -all) aliases that allow to blanketly enable or disable all key exchange algorithms at once.

Note: the list of algorithms provided to this property alters the baseline list of key exchange algorithms pre-configured for this component. Remember to start your algorithm string with -all; if you need to only enable a specific fixed set of algorithms. The list of supported kex algorithms is provided below:

  • diffie-hellman-group-exchange-sha1
  • diffie-hellman-group1-sha1
  • diffie-hellman-group14-sha1
  • diffie-hellman-group-exchange-sha256
  • rsa1024-sha1
  • rsa2048-sha256
  • ecdh-sha2-nistp256
  • ecdh-sha2-nistp384
  • ecdh-sha2-nistp521
  • ecdh-sha2-nistk163
  • ecdh-sha2-nistp192
  • ecdh-sha2-nistp224
  • ecdh-sha2-nistk233
  • ecdh-sha2-nistb233
  • ecdh-sha2-nistk283
  • ecdh-sha2-nistk409
  • ecdh-sha2-nistb409
  • ecdh-sha2-nistt571
  • ecdh-sha2-curve25519
  • curve25519-sha256@libssh.org
  • curve448-sha512@libssh.org
  • diffie-hellman-group14-sha256
  • diffie-hellman-group15-sha512
  • diffie-hellman-group16-sha512
  • diffie-hellman-group17-sha512
  • diffie-hellman-group18-sha512

MacAlgorithms
string

Default: ""

A list of MAC (for message authentication code) algorithms separated with commas or semicolons. Each algorithm in the list may be prefixed with a minus sign (-) to indicate that the algorithm should be disabled rather than enabled. Besides the specific algorithm names, this property supports the all (and -all) aliases that allow to blanketly enable or disable all MAC algorithms at once.

Note: the list of algorithms provided to this property alters the baseline list of MAC algorithms pre-configured for this component. Remember to start your algorithm string with -all; if you need to only enable a specific fixed set of algorithms. The list of supported MAC algorithms is provided below:

  • hmac-sha1
  • hmac-sha1-96
  • hmac-md5
  • hmac-md5-96
  • none
  • hmac-ripemd160
  • hmac-ripemd
  • hmac-ripemd160@openssh.com
  • hmac-sha256@ssh.com
  • hmac-sha256-96@ssh.com
  • umac-32@openssh.com
  • umac-64@openssh.com
  • umac-96@openssh.com
  • umac-128@openssh.com
  • hmac-sha2-256
  • hmac-sha2-512
  • aes128-gcm
  • aes256-gcm
  • chacha20-poly1305@openssh.com
  • hmac-sha2-256-etm@openssh.com
  • hmac-sha2-512-etm@openssh.com

MaxSSHPacketSize
int

Default: 262144

Specifies the maximum length of one SSH packet in bytes.

MinWindowSize
int

Default: 2048

Specifies the minimal internal window size. When the minimal window size is reached, the 'window extension' request is sent to the server. This request notifies the server that the window was extended, and it can send more data.

ObfuscateHandshake
bool

Default: False

Enables or disables handshake obfuscation.

ObfuscationPassword
string

Default: ""

Specifies the password used to encrypt the handshake when ObfuscateHandshake is set.

PublicKeyAlgorithms
string

Default: ""

A list of public key algorithms separated with commas or semicolons. Each algorithm in the list may be prefixed with a minus sign (-) to indicate that the algorithm should be disabled rather than enabled. Besides the specific algorithm names, this property supports the all (and -all) aliases that allow to blanketly enable or disable all public key algorithms at once.

Note: the list of algorithms provided to this property alters the baseline list of public key algorithms pre-configured for this component. Remember to start your algorithm string with -all; if you need to only enable a specific fixed set of algorithms. The list of supported public key algorithms is provided below:

  • ssh-dss
  • ssh-rsa
  • x509v3-sign-rsa
  • x509v3-sign-dss
  • spki-sign-rsa,
  • spki-sign-dss
  • pgp-sign-rsa
  • pgp-sign-dss
  • ecdsa-sha2-nistp256
  • ecdsa-sha2-nistp384
  • ecdsa-sha2-nistp521
  • ecdsa-sha2-nistk163
  • ecdsa-sha2-nistp192
  • ecdsa-sha2-nistp224
  • ecdsa-sha2-nistk233
  • ecdsa-sha2-nistb233
  • ecdsa-sha2-nistk283
  • ecdsa-sha2-nistk409
  • ecdsa-sha2-nistb409
  • ecdsa-sha2-nistt571,
  • ecdsa-sha2-curve25519
  • x509v3-ssh-rsa
  • x509v3-ssh-dss
  • x509v3-rsa2048-sha256
  • x509v3-ecdsa-sha2-nistp256
  • x509v3-ecdsa-sha2-nistp384
  • x509v3-ecdsa-sha2-nistp521
  • x509v3-ecdsa-sha2-nistk163
  • x509v3-ecdsa-sha2-nistp192
  • x509v3-ecdsa-sha2-nistp224
  • x509v3-ecdsa-sha2-nistk233
  • x509v3-ecdsa-sha2-nistb233
  • x509v3-ecdsa-sha2-nistk283
  • x509v3-ecdsa-sha2-nistk409
  • x509v3-ecdsa-sha2-nistb409
  • x509v3-ecdsa-sha2-nistt571
  • x509v3-ecdsa-sha2-curve25519
  • ssh-ed25519
  • ssh-ed448
  • rsa-sha2-256
  • rsa-sha2-512

RequestPasswordChange
bool

Default: False

Whether to request a password change when connecting.

SoftwareName
string

Default: "SecureBlackbox"

The name to be used by the component to identify itself.

TrustAllKeys
bool

Default: False

Enables or disables explicit trust to all server keys. Use with care.

UseAuthAgent
bool

Default: False

Enables or disables the use of external key agent, such as Putty key agent.

Versions
int

Default: 1

Specifies enabled SSH protocol versions (1 or 2).

Constructors

public SSHSettings();
Public SSHSettings()

Creates a new object with default settings.

UserAccount Type

A container for user account information.

Remarks

UserAccount objects are used to store user account information, such as logins and passwords.

The following fields are available:

Fields

AssociatedData
byte[]

Default: ""

Contains the user's Associated Data when SSH AEAD (Authenticated Encryption with Associated Data) algorithm is used.

BasePath
string

Default: ""

Base path for this user in the server's file system.

Certificate
byte[]

Default: ""

Contains the user's certificate.

Data
string

Default: ""

Contains uninterpreted user-defined data that should be associated with the user account, such as comments or custom settings.

Email
string

Default: ""

The user's email address.

HashAlgorithm
string

Default: ""

Specifies the hash algorithm used to generate TOTP (Time-based One-Time Passwords) passwords for this user. Three HMAC algorithms are supported, with SHA-1, SHA-256, and SHA-512 digests:

SB_MAC_ALGORITHM_HMAC_SHA1SHA1
SB_MAC_ALGORITHM_HMAC_SHA256SHA256
SB_MAC_ALGORITHM_HMAC_SHA512SHA512

IncomingSpeedLimit
int

Default: 0

Specifies the incoming speed limit for this user. The value of 0 (zero) means "no limitation".

OtpAlgorithm
OTPAlgorithms

Default: 0

The algorithm used to generate one-time passwords (OTP) for this user, either HOTP (Hash-based OTP) or TOTP (Time-based OTP). In the former case, a value of a dedicated counter is used to generate a unique password, while in the latter the password is generated on the basis of the current time value.

oaHmac0
oaTime1

OTPLen
int

Default: 0

Specifies the length of the user's OTP password.

OtpValue
int

Default: 0

The user's time interval (TOTP) or Counter (HOTP).

OutgoingSpeedLimit
int

Default: 0

Specifies the outgoing speed limit for this user. The value of 0 (zero) means "no limitation".

Password
string

Default: ""

The user's authentication password.

SharedSecret
byte[]

Default: ""

Contains the user's secret key, which is essentially a shared secret between the client and server.

Shared secrets can be used in TLS-driven protocols, as well as in OTP (where it is called a 'key secret') for generating one-time passwords on one side, and validate them on the other.

SSHKey
byte[]

Default: ""

Contains the user's SSH key.

Username
string

Default: ""

The registered name (login) of the user.

Constructors

public UserAccount();
Public UserAccount()

Creates a new UserAccount object

Config Settings (SFTPServer Component)

The component accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

SFTPServer Config Settings

AllAlgorithms:   Returns the list of algorithms enabled in the component.

Use this configuration setting to obtain the list of algorithms currently enabled in the component in the kexinit format.

AuthMode:   Controls dual/multi-type authentication mode.

Use this setting to adjust dual/multi-step authentication mode. The value of 0 indicates that either of supported authentication methods is sufficient to authenticate the user ("any of"). The value of 1 specifies that the user should pass all the enabled methods to authenticate themselves (MFA, or "all of").

AutoGenerateLongNames:   TBD.

TBD

Banner[i]:   TBD.

TBD

BannerSendStage:   TBD.

TBD

CommandModeEnabled:   TBD.

TBD

CompressionAlgorithms:   Returns the list of compression algorithms enabled in the component.

Use this configuration setting to get the list of compression algorithms currently enabled in the component, as a respective kexinit block line.

CustomDHGroupIndex:   Sets a specific Diffie-Hellman group index to enforce.

Use this property to specify a specific DH group index to enforce for key exchange. The value of -1 enables automatic group selection, and any value between 0 and 227 specifies a particular DH group supported by SecureBlackbox. This is largely a debug setting, use it with extreme care.

DefBanner:   TBD.

TBD

DefLanguageTag:   TBD.

TBD

DualStack:   Allows the use of ip4 and ip6 simultaneously.

This setting specifies a socket can use ip4 and ip6 simultaneously.

EncryptionAlgorithms:   Returns the list of encryption algorithms enabled in the component.

Use this configuration setting to get the list of symmetric encryption algorithms currently enabled in the component, as a respective kexinit block line.

KexAlgorithms:   Returns the list of key exchange algorithms enabled in the component.

Use this configuration setting to get the list of key exchange algorithms currently enabled in the component, as a respective kexinit block line.

LanguageTag[i]:   TBD.

TBD

MacAlgorithms:   Returns the list of MAC algorithms enabled in the component.

Use this configuration setting to get the list of MAC algorithms currently enabled in the component, as a respective kexinit block line.

MaxDHGroupSize:   Sets the maximal Diffie-Hellman group size.

This property specifies the maximal DH group size, in bits. The larger the group size, the strong the key, however, longer groups put extra burden on the computational resources. SecureBlackbox supports groups between 1024 and 8192 bits. The default value is 8192.

MinDHGroupSize:   Sets the minimal Diffie-Hellman group size.

This property specifies the minimal DH group size, in bits. The larger the group size, the strong the key, however, longer groups put extra burden on the computational resources. SecureBlackbox supports groups between 1024 and 8192 bits. The default value is 2048.

NotifyOnFileOperations:   Enables low-level file operation notifications.

If set, the component will report low-level file operations, such as Open, Read, Write, and Close, via its Notification event.

PublicKeyAlgorithms:   Returns the list of public key algorithms enabled in the component.

Use this configuration setting to get the list of public key algorithms currently enabled in the component, as a respective kexinit block line.

RefreshUsers:   Enables or disables real-time propagation of user information.

Set this property to true to make the content of the Users property propagate to the server immediately. The default setting is false, which delays the effect of any changes in the Users setting until the server is restarted.

SFTPModeEnabled:   TBD.

TBD

ShellModeEnabled:   TBD.

TBD

UseStrictKeyExchange:   Specifies how strict key exchange is supported.

This setting controls whether strict key exchange (strict kex) is enabled to mitigate the Terrapin attack. When enabled, the component will indicate support for strict key exchange by automatically including the pseudo-algorithm kex-strict-c-v00@openssh.com for client components and kex-strict-s-v00@openssh.com for server components in the list of supported key exchange algorithms.

Since both client and server must implement strict key exchange to effectively mitigate the Terrapin attack, the component provides options to further control the behavior in different scenarios. Possible values for this setting are:

0Disabled. Strict key exchange is not supported in the component.
1 (default)Enabled, but not enforced. This setting enables strict key exchange, but if the remote host does not support strict key exchange the connection is still allowed to continue.
2Enabled, but reject affected algorithms if the remote host does not support strict key exchange. If the remote host supports strict key exchange all algorithms may be used. If the remote host does not support strict key exchange the connection will only continue if the selected encryption and MAC algorithms are not affected by the Terrapin attack.
3Required. If the remote host does not support strict key exchange the connection will fail.

Base Config Settings

ASN1UseGlobalTagCache:   Controls whether ASN.1 module should use a global object cache.

This is a performance setting. It is unlikely that you will ever need to adjust it.

AssignSystemSmartCardPins:   Specifies whether CSP-level PINs should be assigned to CNG keys.

This is a low-level tweak for certain cryptographic providers. It is unlikely that you will ever need to adjust it.

CheckKeyIntegrityBeforeUse:   Enables or disable private key integrity check before use.

This global property enables or disables private key material check before each signing operation. This slows down performance a bit, but prevents a selection of attacks on RSA keys where keys with unknown origins are used.

You can switch this property off to improve performance if your project only uses known, good private keys.

CookieCaching:   Specifies whether a cookie cache should be used for HTTP(S) transports.

Set this property to enable or disable cookies caching for the component.

Supported values are:

offNo caching (default)
localLocal caching
globalGlobal caching

Cookies:   Gets or sets local cookies for the component.

Use this property to get cookies from the internal cookie storage of the component and/or restore them back between application sessions.

DefDeriveKeyIterations:   Specifies the default key derivation algorithm iteration count.

This global property sets the default number of iterations for all supported key derivation algorithms. Note that you can provide the required number of iterations by using properties of the relevant key generation component; this global setting is used in scenarios where specific iteration count is not or cannot be provided.

DNSLocalSuffix:   The suffix to assign for TLD names.

Use this global setting to adjust the default suffix to assign to top-level domain names. The default is .local.

EnableClientSideSSLFFDHE:   Enables or disables finite field DHE key exchange support in TLS clients.

This global property enables or disables support for finite field DHE key exchange methods in TLS clients. FF DHE is a slower algorithm if compared to EC DHE; enabling it may result in slower connections.

This setting only applies to sessions negotiated with TLS version 1.3.

GlobalCookies:   Gets or sets global cookies for all the HTTP transports.

Use this property to get cookies from the GLOBAL cookie storage or restore them back between application sessions. These cookies will be used by all the components that have its CookieCaching property set to "global".

HardwareCryptoUsePolicy:   The hardware crypto usage policy.

This global setting controls the hardware cryptography usage policy: auto, enable, or disable.

HttpUserAgent:   Specifies the user agent name to be used by all HTTP clients.

This global setting defines the User-Agent field of the HTTP request provides information about the software that initiates the request. This value will be used by all the HTTP clients including the ones used internally in other components.

HttpVersion:   The HTTP version to use in any inner HTTP client components created.

Set this property to 1.0 or 1.1 to indicate the HTTP version that any internal HTTP clients should use.

IgnoreExpiredMSCTLSigningCert:   Whether to tolerate the expired Windows Update signing certificate.

It is not uncommon for Microsoft Windows Update Certificate Trust List to be signed with an expired Microsoft certificate. Setting this global property to true makes SBB ignore the expired factor and take the Trust List into account.

ListDelimiter:   The delimiter character for multi-element lists.

Allows to set the delimiter for any multi-entry values returned by the component as a string object, such as file lists. For most of the components, this property is set to a newline sequence.

LogDestination:   Specifies the debug log destination.

Contains a comma-separated list of values that specifies where debug log should be dumped.

Supported values are:

fileFile
consoleConsole
systemlogSystem Log (supported for Android only)
debuggerDebugger (supported for VCL for Windows and .Net)

LogDetails:   Specifies the debug log details to dump.

Contains a comma-separated list of values that specifies which debug log details to dump.

Supported values are:

timeCurrent time
levelLevel
packagePackage name
moduleModule name
classClass name
methodMethod name
threadidThread Id
contenttypeContent type