SFTPServer Class

Properties   Methods   Events   Config Settings   Errors  

The SFTPServer class is used to create a Secure File Transfer Protocol (SFTP) server.

Syntax

ipworkssftp.sftpserver()

Remarks

The SFTPServer class provides a simple way to create a Secure File Transfer Protocol (SFTP) server. Any SFTP client will be able to connect and transfer files to and from the server.

Getting Started

To begin, first provide a valid certificate with a private key in the SSHCert property.

Optionally set the RootDirectory property to a valid local path. If this property is set, the class will serve files from this location, and when clients connect, they will see this as their initial directory. If this property is not set, then the class will fire events allowing customized responses for each operation.

To start the server, set Listening to True.

Client Authentication

Client authentication is handled through the SSHUserAuthRequest event. Inside this event, the Accept parameter determines whether authentication is accepted; this parameter should be set to True if a successful authentication is detected and False otherwise.

When a client connects, the AuthMethod parameter indicates the method of authentication the client wishes to use. Connecting clients will initially attempt authentication with an AuthMethod of "none". This is done with the expectation that the request will fail and the server will provide a list of support authentication methods. The client then selects an available method and reauthenticates. If AuthMethod is "none", Accept should be set to False.

For password authentication, the User parameter will hold the client's username and the AuthParam parameter will hold the password provided by the client. An external list of known usernames and passwords should be maintained to check these values against.

For publickey authentication, the User parameter will hold the client's username and the AuthParam parameter will hold the key provided by the client. This key should be compared to an external list of known keys and usernames.

For keyboard-interactive authentication, the SSHUserAuthRequest event will fire multiple times; once for each prompt and response sent by the client. The index of the response is specified as a suffix in the AuthMethod parameter (e.g., keyboard-interactive-1, keyboard-interactive-2), and AuthParam will contain the client's response to the prompt. Finally, SSHUserAuthRequest will fire one last time with AuthMethod set to "keyboard-interactive" and AuthParam set to an empty string. The Accept parameter must be set to True each time the event fires for the authentication process to succeed.

Directory Listing

When a client requests a directory listing, the DirList event fires with the Path parameter set to the directory to enumerate. If the directory listing is allowed, the appropriate set of files should be passed to the SetFileList method. The StatusCode parameter should be set according to the status of the operation, and the valid status codes can be found in the documentation for the DirList event.

Handling Events

Event handlers are the primary method of customizing the class's functionality. When a client attempts to connect, open a file, authenticate to the server, and so on, the corresponding SFTPServer event will fire to allow for custom handling of the client's request.

The following events are fired both before and after the requested operation is executed:

• DirCreate
• DirList
• DirRemove
• FileOpen
• FileRemove
• FileRename
• FileWrite
• SetAttributes

Each of these events has a BeforeExec event parameter that is True when the event is fired before execution of the operation, and False after execution of the operation. Handling the event before execution provides an opportunity to use custom logic to determine whether the operation should be denied, diverted, or otherwise modified. Handling the event after execution provides an opportunity to report success or any errors related to the operation to the client.

The following events are fired only after the requested operation is executed:

• FileClose
• FileRead
• GetAttributes
• ResolvePath

Any logic to deny opening a file for read or write should be done in the FileOpen event handler.

Note: Server components are designed to process events as they occur. To ensure that events are processed in a timely manner, DoEvents should be called in a loop after the server is started.

Property List

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

Method List

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

Event List

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

Config Settings

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

SFTPServer.ConnectionBacklog Property

This property includes the maximum number of pending connections maintained by the Transmission Control Protocol (TCP)/IP subsystem.

Syntax

getConnectionBacklog(): number;
setConnectionBacklog(connectionBacklog: number): void;

Default Value

5

Remarks

This property contains the maximum number of pending connections maintained by the TCP/IP subsystem. This value reflects the SOMAXCONN option for the main listening socket. The default value for most systems is 5. You may set this property to a larger value if the server is expected to receive a large number of connections, and queuing them is desirable.

This property is not available at design time.

SFTPServer.Connections Property

The collection of currently connected secure file transfer protocol (SFTP) clients.

Syntax

getConnections(): SFTPConnectionMap;

Default Value

Remarks

This property is the collection of currently connected clients. All of the connections may be managed using this property. Each connection is described by the different fields of the SFTPConnection type.

This property is read-only.

SFTPServer.DefaultAuthMethods Property

The supported authentication methods.

Syntax

getDefaultAuthMethods(): string;
setDefaultAuthMethods(defaultAuthMethods: string): void;

Default Value

"password,publickey"

Remarks

This property specifies the supported authentication methods. The client will choose one of the supported mechanisms when authenticating to the class.

This must be a comma-separated list of values. For more information on authenticating clients, see the SSHUserAuthRequest event.

The following is a list of methods implemented by the class:

SFTPServer.DefaultTimeout Property

An initial timeout value to be used by incoming connections.

Syntax

getDefaultTimeout(): number;
setDefaultTimeout(defaultTimeout: number): void;

Default Value

60

Remarks

This property is used by the class to set the operational timeout value of all inbound connections once they are established. If the timeout is set to 0, all inbound connections will behave asynchronously. The default value is 60, meaning the class will behave synchronously.

SFTPServer.KeyboardInteractiveMessage Property

The instructions to send to the client during keyboard-interactive authentication.

Syntax

getKeyboardInteractiveMessage(): string;
setKeyboardInteractiveMessage(keyboardInteractiveMessage: string): void;

Default Value

""

Remarks

This property should be set to the main instructions to send to the client during keyboard-interactive authentication.

SFTPServer.KeyboardInteractivePrompts Property

A collection of prompts to present to the user for keyboard-interactive authentication.

Syntax

getKeyboardInteractivePrompts(): SSHPromptList;
setKeyboardInteractivePrompts(keyboardInteractivePrompts: SSHPromptList): void;

Default Value

Remarks

This property is a collection of prompts to present to the user during keyboard-authentication. It is used together with the KeyboardInteractiveMessage property.

SFTPServer.Listening Property

This property indicates whether the class is listening for incoming connections on LocalPort.

Syntax

isListening(): boolean;

Default Value

FALSE

Remarks

This property indicates whether the class is listening for connections on the port specified by the LocalPort property. Use the StartListening and StopListening methods to control whether the class is listening.

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

SFTPServer.LocalHost Property

The name of the local host or user-assigned IP interface through which connections are initiated or accepted.

Syntax

getLocalHost(): string;
setLocalHost(localHost: string): void;

Default Value

""

Remarks

This property contains the name of the local host as obtained by the gethostname() system call, or if the user has assigned an IP address, the value of that address.

In multihomed hosts (machines with more than one IP interface) setting LocalHost to the IP address of an interface will make the class initiate connections (or accept in the case of server classs) only through that interface. It is recommended to provide an IP address rather than a hostname when setting this property to ensure the desired interface is used.

If the class is connected, the LocalHost property shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multihomed hosts (machines with more than one IP interface).

Note: LocalHost is not persistent. You must always set it in code, and never in the property window.

SFTPServer.LocalPort Property

The Transmission Control Protocol (TCP) port in the local host where the class listens.

Syntax

getLocalPort(): number;
setLocalPort(localPort: number): void;

Default Value

22

Remarks

The LocalPort property must be set before TCPServer starts listening. If its value is 0, then the TCP/IP subsystem picks a port number at random. The port number can be found by checking the value of the LocalPort property after TCPServer is in listening mode (after successfully assigning True to the Listening property).

The service port is not shared among servers (i.e., only one TCPServer can be 'listening' on a particular port at one time).

SFTPServer.RootDirectory Property

The root directory for the entire secure file transfer protocol (SFTP) server.

Syntax

getRootDirectory(): string;
setRootDirectory(rootDirectory: string): void;

Default Value

""

Remarks

RootDirectory specifies the root of the SFTP server ('/'). If a value is provided, the class will handle all requests by doing all file operations itself, but the events will still give you the opportunity to override the default values and operations, as necessary.

If a value is not provided, all events must be handled appropriately to ensure correct operation.

SFTPServer.SSHCert Property

A certificate to be used during Secure Shell (SSH) negotiation.

Syntax

getSSHCert(): Certificate;
setSSHCert(SSHCert: Certificate): void;

Default Value

Remarks

The digital certificate that the server will use during SSH negotiation. A certificate with a private key is required for session authentication and encryption.

This is the server's certificate, and must be set before setting Listening to True.

SFTPServer.SSHCompressionAlgorithms Property

The comma-separated list containing all allowable compression algorithms.

Syntax

getSSHCompressionAlgorithms(): string;
setSSHCompressionAlgorithms(SSHCompressionAlgorithms: string): void;

Default Value

"none,zlib"

Remarks

During the Secure Shell (SSH) handshake, this list will be used to negotiate the compression algorithm to be used between the client and server. This list is used for both directions: client to server and server to client. When negotiating algorithms, each side sends a list of all algorithms it supports or allows. The algorithm chosen for each direction is the first algorithm to appear in the sender's list that the receiver supports. Therefore, it is important to list multiple algorithms in preferential order. If no algorithm can be agreed on, the class will raise an error and the connection will be aborted.

At least one supported algorithm must appear in this list. The following compression algorithms are supported by the class:

• zlib
• zlib@openssh.com
• none

SFTPServer.SSHEncryptionAlgorithms Property

The comma-separated list containing all allowable encryption algorithms.

Syntax

getSSHEncryptionAlgorithms(): string;
setSSHEncryptionAlgorithms(SSHEncryptionAlgorithms: string): void;

Default Value

"aes256-ctr,aes192-ctr,aes128-ctr,3des-ctr,arcfour256,arcfour128,arcfour,aes256-gcm@openssh.com,aes128-gcm@openssh.com,chacha20-poly1305@openssh.com"

Remarks

During the Secure Shell (SSH) handshake, this list will be used to negotiate the encryption algorithm to be used between the client and server. This list is used for both directions: client to server and server to client. When negotiating algorithms, each side sends a list of all algorithms it supports or allows. The algorithm chosen for each direction is the first algorithm to appear in the sender's list that the receiver supports. Therefore, it is important to list multiple algorithms in preferential order. If no algorithm can be agreed on, the class will raise an error and the connection will be aborted.

At least one supported algorithm must appear in this list. The following encryption algorithms are supported by the class:

SFTPServer.config Method

Sets or retrieves a configuration setting.

Syntax

async sftpserver.config(configurationString : string): Promise<string>

Remarks

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

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, 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.

SFTPServer.disconnect Method

This method disconnects the specified client.

Syntax

async sftpserver.disconnect(connectionId : string): Promise<void>

Remarks

Calling this method will disconnect the client specified by the ConnectionId parameter.

SFTPServer.doEvents Method

This method processes events from the internal message queue.

Syntax

async sftpserver.doEvents(): Promise<void>

Remarks

When DoEvents is called, the class processes any available events. If no events are available, it waits for a preset period of time, and then returns.

SFTPServer.exchangeKeys Method

Causes the class to exchange a new set of session keys on the specified connection.

Syntax

async sftpserver.exchangeKeys(connectionId : string): Promise<void>

Remarks

Secure Shell (SSH) key renegotiation can be initiated by either end of an established SSH connection. ExchangeKeys allows the server to start such a renegotiation with the client. During this process, SSHStatus events will fire containing updates regarding the key negotiation process.

The SSH 2.0 specification recommends that key renegotiation be done once for 2 gigabytes (GB) of data processed by the connection, or once every day. This makes it more difficult to break the security of data-intensive or long-lived connections.

SFTPServer.reset Method

This method will reset the class.

Syntax

async sftpserver.reset(): Promise<void>

Remarks

This method will reset the class's properties to their default values.

SFTPServer.setFileList Method

Sets the file list for a connection during a directory listing request.

Syntax

async sftpserver.setFileList(connectionId : string, list : Array): Promise<void>

Remarks

SetFileList should be set when a directory listing is requested by the client. The list parameter should be a string of all the filenames to include, separated by CRLF.

SFTPServer.shutdown Method

This method shuts down the server.

Syntax

async sftpserver.shutdown(): Promise<void>

Remarks

This method shuts down the server. Calling this method is equivalent to calling StopListening and then breaking every client connection by calling Disconnect.

SFTPServer.startListening Method

This method starts listening for incoming connections.

Syntax

async sftpserver.startListening(): Promise<void>

Remarks

This method begins listening for incoming connections on the port specified by LocalPort. Once listening, events will fire as new clients connect and data are transferred.

To stop listening for new connections, call StopListening. To stop listening for new connections and to disconnect all existing clients, call Shutdown.

SFTPServer.stopListening Method

This method stops listening for new connections.

Syntax

async sftpserver.stopListening(): Promise<void>

Remarks

This method stops listening for new connections. After being called, any new connection attempts will be rejected. Calling this method does not disconnect existing connections.

To stop listening and to disconnect all existing clients, call Shutdown instead.

SFTPServer.Connected Event

Fired immediately after a connection completes (or fails).

Syntax

sftpserver.on('Connected', listener: (e: {readonly connectionId: string, readonly statusCode: number, readonly description: string, certStoreType: number, certStore: string, certPassword: string, certSubject: string}) => void )

Remarks

If the connection is made normally, StatusCode is 0, and Description is "OK".

If the connection fails, StatusCode has the error code returned by the system. Description contains a description of this code. The value of StatusCode is equal to the value of the system error.

Please refer to the Error Codes section for more information.

ConnectionId is the connection Id of the client requesting the connection.

CertStoreType is the store type of the alternate certificate to use for this connection. The class supports both public and private keys in a variety of formats. When the cstAuto value is used, the class will automatically determine the type. This property can take one of the following values:

CertStore is the store name or location of the alternate certificate to use for this connection.

Designations of certificate stores are platform dependent.

The following designations are the most common User and Machine certificate stores in Windows:

When the certificate store type is cstPFXFile, this property must be set to the name of the file. When the type is cstPFXBlob, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

CertPassword is the password of the certificate store containing the alternate certificate to use for this connection.

CertSubject is the subject of the alternate certificate to use for this connection.

The special value * matches any subject and will select the first certificate in the store. The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=support@nsoftware.com". Common fields and their meanings are as follows:

If a field value contains a comma, it must be quoted.

SFTPServer.ConnectionRequest Event

This event is fired when a request for connection comes from a remote host.

Syntax

sftpserver.on('ConnectionRequest', listener: (e: {readonly address: string, readonly port: number, accept: boolean}) => void )

Remarks

This event indicates an incoming connection. The connection is accepted by default. Address and Port will contain information about the remote host requesting the inbound connection. If you want to refuse it, you can set the Accept parameter to False.

SFTPServer.DirCreate Event

Fired when a client wants to create a new directory.

Syntax

sftpserver.on('DirCreate', listener: (e: {readonly connectionId: string, readonly user: string, readonly path: string, readonly fileType: number, readonly fileSize: number, readonly fileOwner: string, readonly fileGroup: string, readonly filePermissions: number, readonly fileATime: number, readonly fileCreateTime: number, readonly fileMTime: number, readonly fileAttribBits: number, readonly fileAttribBitsValid: number, readonly otherAttributes: string, readonly beforeExec: boolean, statusCode: number}) => void )

Remarks

The Path parameter specifies the path and name of the new directory.

This event is fired both before and after the directory is created. The BeforeExec parameter is True before the operation has been executed and False otherwise. Handling this event before execution of the operation provides an opportunity to add custom logic that may prevent or deny the operation. Handling this event after execution of the operation provides an opportunity to report any errors that may have occurred during the operation.

File/Directory Attributes are specified using the following values:

FileType: The type of file. Can be one of the following values:

• SSH_FILEXFER_TYPE_REGULAR (1)
• SSH_FILEXFER_TYPE_DIRECTORY (2)
• SSH_FILEXFER_TYPE_SYMLINK (3)
• SSH_FILEXFER_TYPE_SPECIAL (4)
• SSH_FILEXFER_TYPE_UNKNOWN (5)
• SSH_FILEXFER_TYPE_SOCKET (6)
• SSH_FILEXFER_TYPE_CHAR_DEVICE (7)
• SSH_FILEXFER_TYPE_BLOCK_DEVICE (8)
• SSH_FILEXFER_TYPE_FIFO (9)

FileSize: The file size, in bytes.

FileOwner: The file owner. If the ProtocolVersion configuration option is "3" (default), this field should be a numeric Unix-like user identifier. V4, V5, and V6 of the secure file transfer protocol (SFTP) allow for an arbitrary string.

FileGroup: The file owner group. If the ProtocolVersion configuration option is "3" (default), this field should be a numeric Unix-like group identifier. V4, V5, and V6 of the SFTP allow for an arbitrary string.

FilePermissions: The POSIX-style file permissions.

FileATime: The file last-access time, in milliseconds since January 1, 1970, in UTC.

FileCreateTime: The file creation time, in milliseconds since January 1, 1970, in UTC.

FileMTime: The file last-modified time, in milliseconds since January 1, 1970, in UTC.

FileAttrBits: The file attributes, as a combination of the following values:

• SSH_FILEXFER_ATTR_FLAGS_READONLY (0x00000001)
• SSH_FILEXFER_ATTR_FLAGS_SYSTEM (0x00000002)
• SSH_FILEXFER_ATTR_FLAGS_HIDDEN (0x00000004)
• SSH_FILEXFER_ATTR_FLAGS_CASE_INSENSITIVE (0x00000008)
• SSH_FILEXFER_ATTR_FLAGS_ARCHIVE (0x00000010)
• SSH_FILEXFER_ATTR_FLAGS_ENCRYPTED (0x00000020)
• SSH_FILEXFER_ATTR_FLAGS_COMPRESSED (0x00000040)
• SSH_FILEXFER_ATTR_FLAGS_SPARSE (0x00000080)
• SSH_FILEXFER_ATTR_FLAGS_APPEND_ONLY (0x00000100)
• SSH_FILEXFER_ATTR_FLAGS_IMMUTABLE (0x00000200)
• SSH_FILEXFER_ATTR_FLAGS_SYNC (0x00000400)
• SSH_FILEXFER_ATTR_FLAGS_TRANSLATION_ERR (0x00000800)

FileAttrBitsValid: A mask specifying which bits in FileAttrBits are supported by the server.

OtherAttributes: A semicolon (;) delimited list of Name=Value pairs of other attributes supported by SFTP. These include the following:

• MIMEType (String)
• AllocationSize (64-bit int)
• ATimeNS (int): ATime nanoseconds
• CreateTimeNS (int): CreateTime nanoseconds
• MTimeNS (int): MTime nanoseconds
• TextHint (8-bit int)
• LinkCount (int)
• UntranslatedName (String)

FileMimeType: The MIME type of the file.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.DirList Event

Fired when a client attempts to open a directory for listing.

Syntax

sftpserver.on('DirList', listener: (e: {readonly connectionId: string, readonly user: string, readonly path: string, readonly beforeExec: boolean, statusCode: number}) => void )

Remarks

The DirList event is fired when a secure file transfer protocol (SFTP) client sends an SSH_FXP_OPENDIR request. The Path parameter will contain the path of the directory to list.

When necessary, you should call SetFileList with the list of files and directories in Path.

This event is fired both before and after the directory is listed. The BeforeExec parameter is True before the operation has been executed and False otherwise. Handling this event before execution of the operation provides an opportunity to add custom logic that may prevent or deny the operation. Handling this event after execution of the operation provides an opportunity to report any errors that may have occurred during the operation.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.DirRemove Event

Fired when a client wants to delete a directory.

Syntax

sftpserver.on('DirRemove', listener: (e: {readonly connectionId: string, readonly user: string, readonly path: string, readonly beforeExec: boolean, statusCode: number}) => void )

Remarks

The Path parameter will specify the directory to delete.

This event is fired both before and after the directory is deleted. The BeforeExec parameter is True before the operation has been executed and False otherwise. Handling this event before execution of the operation provides an opportunity to add custom logic that may prevent or deny the operation. Handling this event after execution of the operation provides an opportunity to report any errors that may have occurred during the operation.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.Disconnected Event

This event is fired when a connection is closed.

Syntax

sftpserver.on('Disconnected', listener: (e: {readonly connectionId: string, readonly statusCode: number, readonly description: string}) => void )

Remarks

If the connection is broken normally, StatusCode is 0, and Description is "OK".

If the connection is broken for any other reason, StatusCode has the error code returned by the system. Description contains a description of this code. The value of StatusCode is equal to the value of the system error.

Please refer to the Error Codes section for more information.

SFTPServer.Error Event

Fired when errors occur during data delivery.

Syntax

sftpserver.on('Error', listener: (e: {readonly connectionId: string, readonly errorCode: number, readonly description: string}) => void )

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the class .

ConnectionId 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 Error Codes section.

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 Error Codes section.

SFTPServer.FileClose Event

Fired when a client attempts to close an open file or directory handle.

Syntax

sftpserver.on('FileClose', listener: (e: {readonly connectionId: string, readonly user: string, readonly path: string, readonly handle: string, statusCode: number}) => void )

Remarks

The FileClose event is fired when a secure file transfer protocol (SFTP) client sends an SSH_FXP_CLOSE request. The Path parameter will contain the path of the file to close.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.FileOpen Event

Fired when a client wants to open or create a file.

Syntax

sftpserver.on('FileOpen', listener: (e: {readonly connectionId: string, readonly user: string, readonly path: string, readonly desiredAccess: number, readonly flags: number, readonly fileType: number, readonly fileSize: number, readonly fileOwner: string, readonly fileGroup: string, readonly filePermissions: number, readonly fileATime: number, readonly fileCreateTime: number, readonly fileMTime: number, readonly fileAttribBits: number, readonly fileAttribBitsValid: number, readonly otherAttributes: string, handle: string, readonly beforeExec: boolean, statusCode: number}) => void )

Remarks

The Path parameter specifies the path and name of the file to open, create. If the operation can be completed successfully, the Handle parameter should be set to the handle identifying the opened file.

Note: The Handle parameter is limited to a 256-byte string. By default, the class will provide an incremental numeric string value for the Handle.

This event is fired both before and after the file is opened. The BeforeExec parameter is True before the operation has been executed and False otherwise. Handling this event before execution of the operation provides an opportunity to add custom logic that may prevent or deny the operation. Handling this event after execution of the operation provides an opportunity to report any errors that may have occurred during the operation.

The Flags parameter specifies file creation and locking options as a bitmask. This may be a combination of the following values:

• SSH_FXF_READ (0x00000001)
• SSH_FXF_WRITE (0x00000002)
• SSH_FXF_APPEND (0x00000004)
• SSH_FXF_CREAT (0x00000008)
• SSH_FXF_TRUNC (0x00000010)
• SSH_FXF_EXCL (0x00000020)

The DesiredAccess parameter is a bitmask containing a combination of values from the ace-mask flags (only for protocol versions 4 and up). This may be a combination of the following values:

• ACE4_READ_DATA (0x00000001)
• ACE4_LIST_DIRECTORY (0x00000001)
• ACE4_WRITE_DATA (0x00000002)
• ACE4_ADD_FILE (0x00000002)
• ACE4_APPEND_DATA (0x00000004)
• ACE4_ADD_SUBDIRECTORY (0x00000004)
• ACE4_READ_NAMED_ATTRS (0x00000008)
• ACE4_WRITE_NAMED_ATTRS (0x00000010)
• ACE4_EXECUTE (0x00000020)
• ACE4_DELETE_CHILD (0x00000040)
• ACE4_READ_ATTRIBUTES (0x00000080)
• ACE4_WRITE_ATTRIBUTES (0x00000100)
• ACE4_DELETE (0x00010000)
• ACE4_READ_ACL (0x00020000)
• ACE4_WRITE_ACL (0x00040000)
• ACE4_WRITE_OWNER (0x00080000)
• ACE4_SYNCHRONIZE (0x00100000)

File/Directory Attributes are specified using the following values:

FileType: The type of file. Can be one of the following values:

• SSH_FILEXFER_TYPE_REGULAR (1)
• SSH_FILEXFER_TYPE_DIRECTORY (2)
• SSH_FILEXFER_TYPE_SYMLINK (3)
• SSH_FILEXFER_TYPE_SPECIAL (4)
• SSH_FILEXFER_TYPE_UNKNOWN (5)
• SSH_FILEXFER_TYPE_SOCKET (6)
• SSH_FILEXFER_TYPE_CHAR_DEVICE (7)
• SSH_FILEXFER_TYPE_BLOCK_DEVICE (8)
• SSH_FILEXFER_TYPE_FIFO (9)

FileSize: The file size, in bytes.

FileOwner: The file owner. If the ProtocolVersion configuration option is "3" (default), this field should be a numeric Unix-like user identifier. V4, V5, and V6 of the secure file transfer protocol (SFTP) allow for an arbitrary string.

FileGroup: The file owner group. If the ProtocolVersion configuration option is "3" (default), this field should be a numeric Unix-like group identifier. V4, V5, and V6 of the SFTP allow for an arbitrary string.

FilePermissions: The POSIX-style file permissions.

FileATime: The file last-access time, in milliseconds since January 1, 1970, in UTC.

FileCreateTime: The file creation time, in milliseconds since January 1, 1970, in UTC.

FileMTime: The file last-modified time, in milliseconds since January 1, 1970, in UTC.

FileAttrBits: The file attributes, as a combination of the following values:

• SSH_FILEXFER_ATTR_FLAGS_READONLY (0x00000001)
• SSH_FILEXFER_ATTR_FLAGS_SYSTEM (0x00000002)
• SSH_FILEXFER_ATTR_FLAGS_HIDDEN (0x00000004)
• SSH_FILEXFER_ATTR_FLAGS_CASE_INSENSITIVE (0x00000008)
• SSH_FILEXFER_ATTR_FLAGS_ARCHIVE (0x00000010)
• SSH_FILEXFER_ATTR_FLAGS_ENCRYPTED (0x00000020)
• SSH_FILEXFER_ATTR_FLAGS_COMPRESSED (0x00000040)
• SSH_FILEXFER_ATTR_FLAGS_SPARSE (0x00000080)
• SSH_FILEXFER_ATTR_FLAGS_APPEND_ONLY (0x00000100)
• SSH_FILEXFER_ATTR_FLAGS_IMMUTABLE (0x00000200)
• SSH_FILEXFER_ATTR_FLAGS_SYNC (0x00000400)
• SSH_FILEXFER_ATTR_FLAGS_TRANSLATION_ERR (0x00000800)

FileAttrBitsValid: A mask specifying which bits in FileAttrBits are supported by the server.

OtherAttributes: A semicolon (;) delimited list of Name=Value pairs of other attributes supported by SFTP. These include the following:

• MIMEType (String)
• AllocationSize (64-bit int)
• ATimeNS (int): ATime nanoseconds
• CreateTimeNS (int): CreateTime nanoseconds
• MTimeNS (int): MTime nanoseconds
• TextHint (8-bit int)
• LinkCount (int)
• UntranslatedName (String)

FileMimeType: The MIME type of the file.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.FileRead Event

Fired when a client wants to read from an open file.

Syntax

sftpserver.on('FileRead', listener: (e: {readonly connectionId: string, readonly user: string, readonly handle: string, readonly fileOffset: number, readonly length: number, statusCode: number}) => void )

Remarks

The Handle parameter identifies an open file on the server. FileOffset specifies the position from which to read data. Length specifies how much data to read. The data read should be set to through ConnectionsFileData

When processing a read request, the server should attempt to read at most Length bytes, but it is okay to read less than Length bytes as well, if no more data are available.

When there are no more data to be read from the file, set StatusCode to SSH_FXS_EOF.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.FileRemove Event

Fired when a client wants to delete a file.

Syntax

sftpserver.on('FileRemove', listener: (e: {readonly connectionId: string, readonly user: string, readonly path: string, readonly beforeExec: boolean, statusCode: number}) => void )

Remarks

The Path parameter will specify the file to delete.

This event is fired both before and after the file is removed. The BeforeExec parameter is True before the operation has been executed and False otherwise. Handling this event before execution of the operation provides an opportunity to add custom logic that may prevent or deny the operation. Handling this event after execution of the operation provides an opportunity to report any errors that may have occurred during the operation.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.FileRename Event

Fired when a client wants to rename a file.

Syntax

sftpserver.on('FileRename', listener: (e: {readonly connectionId: string, readonly user: string, readonly path: string, readonly newPath: string, readonly flags: number, readonly beforeExec: boolean, statusCode: number}) => void )

Remarks

The Path parameter will specify the file to rename and NewPath will specify the new name. The Flags parameter will be a bit mask of the values SSH_FXF_RENAME_OVERWRITE (0x00000001), SSH_FXF_RENAME_ATOMIC (0x00000002), and SSH_FXF_RENAME_NATIVE (0x00000004).

This event is fired both before and after the file is renamed. The BeforeExec parameter is True before the operation has been executed and False otherwise. Handling this event before execution of the operation provides an opportunity to add custom logic that may prevent or deny the operation. Handling this event after execution of the operation provides an opportunity to report any errors that may have occurred during the operation.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.FileWrite Event

Fired when a client wants to write to an open file.

Syntax

sftpserver.on('FileWrite', listener: (e: {readonly connectionId: string, readonly user: string, readonly handle: string, readonly fileOffset: number, readonly beforeExec: boolean, statusCode: number}) => void )

Remarks

The Handle parameter identifies an open file on the server. FileOffset specifies the position at which to write data. The data to write can be retrieved through ConnectionsFileData

This event is fired both before and after the file is written. The BeforeExec parameter is True before the operation has been executed and False otherwise. Handling this event before execution of the operation provides an opportunity to add custom logic that may prevent or deny the operation. Handling this event after execution of the operation provides an opportunity to report any errors that may have occurred during the operation.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.GetAttributes Event

Fired when a client needs to get file information.

Syntax

sftpserver.on('GetAttributes', listener: (e: {readonly connectionId: string, readonly user: string, readonly path: string, readonly flags: number, fileType: number, fileSize: number, fileOwner: string, fileGroup: string, filePermissions: number, fileATime: number, fileCreateTime: number, fileMTime: number, fileAttribBits: number, fileAttribBitsValid: number, otherAttributes: string, statusCode: number}) => void )

Remarks

The GetAttributes event fires when a secure file transfer protocol (SFTP) client sends an SSH_FXP_STAT, SSH_FXP_LSTAT, or SSH_FXP_FSTAT request. Path is the file path. Flags specifies the set of file attributes the client is interested in.

File/Directory Attributes are specified using the following values:

FileType: The type of file. Can be one of the following values:

• SSH_FILEXFER_TYPE_REGULAR (1)
• SSH_FILEXFER_TYPE_DIRECTORY (2)
• SSH_FILEXFER_TYPE_SYMLINK (3)
• SSH_FILEXFER_TYPE_SPECIAL (4)
• SSH_FILEXFER_TYPE_UNKNOWN (5)
• SSH_FILEXFER_TYPE_SOCKET (6)
• SSH_FILEXFER_TYPE_CHAR_DEVICE (7)
• SSH_FILEXFER_TYPE_BLOCK_DEVICE (8)
• SSH_FILEXFER_TYPE_FIFO (9)

FileSize: The file size, in bytes.

FileOwner: The file owner. If the ProtocolVersion configuration option is "3" (default), this field should be a numeric Unix-like user identifier. V4, V5, and V6 of the secure file transfer protocol (SFTP) allow for an arbitrary string.

FileGroup: The file owner group. If the ProtocolVersion configuration option is "3" (default), this field should be a numeric Unix-like group identifier. V4, V5, and V6 of the SFTP allow for an arbitrary string.

FilePermissions: The POSIX-style file permissions.

FileATime: The file last-access time, in milliseconds since January 1, 1970, in UTC.

FileCreateTime: The file creation time, in milliseconds since January 1, 1970, in UTC.

FileMTime: The file last-modified time, in milliseconds since January 1, 1970, in UTC.

FileAttrBits: The file attributes, as a combination of the following values:

• SSH_FILEXFER_ATTR_FLAGS_READONLY (0x00000001)
• SSH_FILEXFER_ATTR_FLAGS_SYSTEM (0x00000002)
• SSH_FILEXFER_ATTR_FLAGS_HIDDEN (0x00000004)
• SSH_FILEXFER_ATTR_FLAGS_CASE_INSENSITIVE (0x00000008)
• SSH_FILEXFER_ATTR_FLAGS_ARCHIVE (0x00000010)
• SSH_FILEXFER_ATTR_FLAGS_ENCRYPTED (0x00000020)
• SSH_FILEXFER_ATTR_FLAGS_COMPRESSED (0x00000040)
• SSH_FILEXFER_ATTR_FLAGS_SPARSE (0x00000080)
• SSH_FILEXFER_ATTR_FLAGS_APPEND_ONLY (0x00000100)
• SSH_FILEXFER_ATTR_FLAGS_IMMUTABLE (0x00000200)
• SSH_FILEXFER_ATTR_FLAGS_SYNC (0x00000400)
• SSH_FILEXFER_ATTR_FLAGS_TRANSLATION_ERR (0x00000800)

FileAttrBitsValid: A mask specifying which bits in FileAttrBits are supported by the server.

OtherAttributes: A semicolon (;) delimited list of Name=Value pairs of other attributes supported by SFTP. These include the following:

• MIMEType (String)
• AllocationSize (64-bit int)
• ATimeNS (int): ATime nanoseconds
• CreateTimeNS (int): CreateTime nanoseconds
• MTimeNS (int): MTime nanoseconds
• TextHint (8-bit int)
• LinkCount (int)
• UntranslatedName (String)

FileMimeType: The MIME type of the file.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.Log Event

Fired once for each log message.

Syntax

sftpserver.on('Log', listener: (e: {readonly connectionId: string, readonly logLevel: number, readonly message: string, readonly logType: string}) => void )

Remarks

Fired once for each log message generated by the class. The verbosity is controlled by the LogLevel setting.

LogLevel indicates the detail level of the message. Possible values are as follows:

Message is the log message.

LogType is reserved for future use.

ConnectionId identifies the connection to which the log message applies.

SFTPServer.ResolvePath Event

Fired when a client attempts to canonicalize a path.

Syntax

sftpserver.on('ResolvePath', listener: (e: {readonly connectionId: string, readonly user: string, readonly originalPath: string, readonly controlFlags: number, realPath: string, statusCode: number}) => void )

Remarks

The ResolvePath event is fired when a secure file transfer protocol (SFTP) client sends an SSH_FXP_REALPATH request. The OriginalPath parameter will contain the path the client wants to canonicalize. ControlFlags can have one of the following values:

RealPath should be set to the resulting canonicalized path, and StatusCode should be set to indicate the success or failure of the operation to the client.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.SetAttributes Event

Fired when a client attempts to set file or directory attributes.

Syntax

sftpserver.on('SetAttributes', listener: (e: {readonly connectionId: string, readonly user: string, readonly path: string, readonly fileType: number, readonly fileSize: number, readonly fileOwner: string, readonly fileGroup: string, readonly filePermissions: number, readonly fileATime: number, readonly fileCreateTime: number, readonly fileMTime: number, readonly fileAttribBits: number, readonly fileAttribBitsValid: number, readonly otherAttributes: string, readonly beforeExec: boolean, statusCode: number}) => void )

Remarks

The SetAttributes event is fired when a secure file transfer protocol (SFTP) client sends an SSH_FXP_SETSTAT, SSH_FXP_FSETSTAT, or SSH_FXP_FSTAT request. Path is the path of the file or directory the client wants to set attributes for.

This event is fired both before and after the attributes are set. The BeforeExec parameter is True before the operation has been executed and False otherwise. Handling this event before execution of the operation provides an opportunity to add custom logic that may prevent or deny the operation. Handling this event after execution of the operation provides an opportunity to report any errors that may have occurred during the operation.

File/Directory Attributes are specified using the following values:

FileType: The type of file. Can be one of the following values:

• SSH_FILEXFER_TYPE_REGULAR (1)
• SSH_FILEXFER_TYPE_DIRECTORY (2)
• SSH_FILEXFER_TYPE_SYMLINK (3)
• SSH_FILEXFER_TYPE_SPECIAL (4)
• SSH_FILEXFER_TYPE_UNKNOWN (5)
• SSH_FILEXFER_TYPE_SOCKET (6)
• SSH_FILEXFER_TYPE_CHAR_DEVICE (7)
• SSH_FILEXFER_TYPE_BLOCK_DEVICE (8)
• SSH_FILEXFER_TYPE_FIFO (9)

FileSize: The file size, in bytes.

FileOwner: The file owner. If the ProtocolVersion configuration option is "3" (default), this field should be a numeric Unix-like user identifier. V4, V5, and V6 of the secure file transfer protocol (SFTP) allow for an arbitrary string.

FileGroup: The file owner group. If the ProtocolVersion configuration option is "3" (default), this field should be a numeric Unix-like group identifier. V4, V5, and V6 of the SFTP allow for an arbitrary string.

FilePermissions: The POSIX-style file permissions.

FileATime: The file last-access time, in milliseconds since January 1, 1970, in UTC.

FileCreateTime: The file creation time, in milliseconds since January 1, 1970, in UTC.

FileMTime: The file last-modified time, in milliseconds since January 1, 1970, in UTC.

FileAttrBits: The file attributes, as a combination of the following values:

• SSH_FILEXFER_ATTR_FLAGS_READONLY (0x00000001)
• SSH_FILEXFER_ATTR_FLAGS_SYSTEM (0x00000002)
• SSH_FILEXFER_ATTR_FLAGS_HIDDEN (0x00000004)
• SSH_FILEXFER_ATTR_FLAGS_CASE_INSENSITIVE (0x00000008)
• SSH_FILEXFER_ATTR_FLAGS_ARCHIVE (0x00000010)
• SSH_FILEXFER_ATTR_FLAGS_ENCRYPTED (0x00000020)
• SSH_FILEXFER_ATTR_FLAGS_COMPRESSED (0x00000040)
• SSH_FILEXFER_ATTR_FLAGS_SPARSE (0x00000080)
• SSH_FILEXFER_ATTR_FLAGS_APPEND_ONLY (0x00000100)
• SSH_FILEXFER_ATTR_FLAGS_IMMUTABLE (0x00000200)
• SSH_FILEXFER_ATTR_FLAGS_SYNC (0x00000400)
• SSH_FILEXFER_ATTR_FLAGS_TRANSLATION_ERR (0x00000800)

FileAttrBitsValid: A mask specifying which bits in FileAttrBits are supported by the server.

OtherAttributes: A semicolon (;) delimited list of Name=Value pairs of other attributes supported by SFTP. These include the following:

• MIMEType (String)
• AllocationSize (64-bit int)
• ATimeNS (int): ATime nanoseconds
• CreateTimeNS (int): CreateTime nanoseconds
• MTimeNS (int): MTime nanoseconds
• TextHint (8-bit int)
• LinkCount (int)
• UntranslatedName (String)

FileMimeType: The MIME type of the file.

Valid status codes are as follows:

• SSH_FX_OK 0
• SSH_FX_EOF 1
• SSH_FX_NO_SUCH_FILE 2
• SSH_FX_PERMISSION_DENIED 3
• SSH_FX_FAILURE 4
• SSH_FX_BAD_MESSAGE 5
• SSH_FX_NO_CONNECTION 6
• SSH_FX_CONNECTION_LOST 7
• SSH_FX_OP_UNSUPPORTED 8
• SSH_FX_INVALID_HANDLE 9
• SSH_FX_NO_SUCH_PATH 10
• SSH_FX_FILE_ALREADY_EXISTS 11
• SSH_FX_WRITE_PROTECT 12
• SSH_FX_NO_MEDIA 13
• SSH_FX_NO_SPACE_ON_FILESYSTEM 14
• SSH_FX_QUOTA_EXCEEDED 15
• SSH_FX_UNKNOWN_PRINCIPAL 16
• SSH_FX_LOCK_CONFLICT 17
• SSH_FX_DIR_NOT_EMPTY 18
• SSH_FX_NOT_A_DIRECTORY 19
• SSH_FX_INVALID_FILENAME 20
• SSH_FX_LINK_LOOP 21
• SSH_FX_CANNOT_DELETE 22
• SSH_FX_INVALID_PARAMETER 23
• SSH_FX_FILE_IS_A_DIRECTORY 24
• SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
• SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
• SSH_FX_DELETE_PENDING 27
• SSH_FX_FILE_CORRUPT 28
• SSH_FX_OWNER_INVALID 29
• SSH_FX_GROUP_INVALID 30
• SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31

SFTPServer.SSHStatus Event

Fired to track the progress of the secure connection.

Syntax

sftpserver.on('SSHStatus', listener: (e: {readonly connectionId: string, readonly message: string}) => void )

Remarks

This event is fired for informational and logging purposes only and is used to track the progress of the connection.

SFTPServer.SSHUserAuthRequest Event

Fired when a client attempts to authenticate a connection.

Syntax

sftpserver.on('SSHUserAuthRequest', listener: (e: {readonly connectionId: string, readonly user: string, readonly service: string, readonly authMethod: string, readonly authParam: string, accept: boolean, partialSuccess: boolean, availableMethods: string, homeDir: string, readonly keyAlgorithm: string}) => void )

Remarks

The SSHUserAuthRequest event fires when a Secure Shell (SSH) client attempts to authenticate itself on a particular connection. ConnectionId will identify the connection being authenticated. User will be the name of the account requesting authentication, and Service will contain the name of the service the client is wishing to access.

AuthMethod will denote which method the client is attempting to use to authenticate itself. AuthParam will contain the value of the authentication token used by the client. If the token is acceptable, you may set Accept to True to allow the SFTPServer to authenticate the client. If it is not, set Accept to False.

Connecting clients will initially attempt authentication with an AuthMethod of "none". This is done with the expectation that the request will fail and the server will send a list of supported methods back to the client. In your implementation, check the AuthMethod parameter; if it is "none", you should set AvailableMethods and reject the request. The client will select one of the available methods and reauthenticate.

You may set AvailableMethods to a comma-delimited string of authentication methods that are available for the user. This list will be sent back to the client so that it may perform further authentication attempts.

The following is a list of methods implemented by the class:

If the user authentication succeeds, you may set HomeDir to the virtual path representing the initial directory for the user. If not set, the initial directory will be RootDirectory.

The PartialSuccess parameter is used only when multifactor authentication is needed. To implement multifactor authentication when this event fires, first verify the AuthParam for the given AuthMethod. If accepted, set PartialSuccess to True and Accept to False. The client should then send the authentication request for a different form of authentication specified in AvailableMethods. You may continue to set PartialSuccess to True until all authentication requirements are satisfied. Once all requirements are satisfied set Accept to True.

KeyAlgorithm holds the signing algorithm used when the client attempts public key authentication. Possible values are as follows:

• ssh-rsa
• rsa-sha2-256
• rsa-sha2-512
• ssh-dss
• ecdsa-sha2-nistp256
• ecdsa-sha2-nistp384
• ecdsa-sha2-nistp521
• x509v3-sign-rsa
• x509v3-sign-dss

Note: Processing long-running requests, including sending channel data, inside this event may cause the underlying transport to stop processing Secure Shell (SSH) data until the event returns. To prevent this from happening, all requests should be processed asynchronously in a separate thread outside of this event.

Certificate Type

This is the digital certificate being used.

Remarks

This type describes the current digital certificate. The certificate may be a public or private key. The fields are used to identify or select certificates.

Fields

Constructors

public Certificate();

public Certificate(String certificateFile);

public Certificate(byte[] encoded);

public Certificate(int storeType, String store, String storePassword, String subject);

public Certificate(int storeType, String store, String storePassword, String subject, String configurationString);

public Certificate(int storeType, String store, String storePassword, byte[] encoded);

public Certificate(int storeType, byte[] store, String storePassword, String subject);

public Certificate(int storeType, byte[] store, String storePassword, String subject, String configurationString);

public Certificate(int storeType, byte[] store, String storePassword, byte[] encoded);

SFTPConnection Type

A currently connected client.

Remarks

This type describes the connection of a client that currently is connected to the class. You may use the different fields of this type to manage the connection.

Fields

Constructors

public SFTPConnection();

SSHPrompt Type

A prompt to provide to the client during keyboard-interactive authentication.

Remarks

This type describes a prompt the Secure Shell (SSH) daemon will send to the client when requesting keyboard-interactive authentication.

Fields

Constructors

public SSHPrompt();

public SSHPrompt(String prompt, boolean echo);

Config Settings (class ipworkssftp.sftpserver)

SFTPServer Config Settings

Root Directory: /

bin
boot
etc
home
  user1
    testfolder

Home Directory: /home/user1

/testfolder

Root Directory: /

bin
boot
etc
home
  user1
    testfolder

Home Directory: /

/testfolder

SSHServer Config Settings

*SSH-1.99-*,*SSH-2.0-*,*SSH-2.99-*

TCPServer Config Settings

Base Config Settings

Trappable Errors (class ipworkssftp.sftpserver)

SFTPServer Errors

SSHServer Errors

TCPServer Errors

TCP/IP Errors