SSHClient Class

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The SSHClient class provides client-side SSH protocol functionality.

Syntax

secureblackbox.SSHClient

Remarks

Use SSHClient to establish terminal-like connections to remote systems and run commands remotely. The component supports most of third-party implementations out there, and is capable of working in "shell" and "command" modes.

Start with assigning your sign-in credentials to Username and Password properties. Where public key authentication is to be used, assign your private authentication key to Key property (remember to set Username in this case too). Subscribe to events to be notified of the session progress. AuthFailed, AuthSucceeded, and Connect are among those particularly useful.

Special attention should be paid to setting up the server key trust. Class only allows connections to servers whose public keys are recognized as trusted, much like any other SSH clients do. Assign a path to the file containing the list of trusted keys to TrustedKeysFile property. If you don't have such file, or if you would like to make trust decisions on the fly, subscribe to KnownKeyReceived and UnknownKeyReceived events. These are fired whenever a trusted or untrusted key is received from the server. For unknown/untrusted keys, you need to set the Action parameter in your UnknownKeyReceived event handler to catAcceptOnce (1) or catAcceptPermanently (2) for the connection to proceed.

Once you are all set up, you can go ahead by calling the Connect method. This launches the SSH handshake and, if everything has been set up right, establishes a connection to the server. You can now use Send and Receive methods to exchange information with the server. You can exchange data in synchronous or asynchronous way; see the description in AsyncMode topic to learn more about each mode.

When you are done with the session, call Disconnect to shut the connection down.

Hint: If you are only interested in a quick-and-dirty execution of a simple, non-interactive command, SSHClient offers a handy shortcut. ConnectAndExec method is a self-contained mechanism which sets up a connection, performs the data exchange internally, and returns the command output. Please keep in mind that you still need to set up the server trust settings as described above for this method to work.

Property List

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

Method List

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

Event List

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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

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

AsyncMode Property (SSHClient Class)

Controls the SSH clients mode of work.

Syntax

public boolean isAsyncMode();


public void setAsyncMode(boolean asyncMode);

Default Value

False

Remarks

This property defines the way in which the class communicates with the application/user code. AsyncMode set to false makes the component use synchronous single-thread approach. Synchronous mode is generally simpler to integrate and use, but please keep in mind that the calls like Connect, Receive or SendBytes may block until their execution completes. In asyncronous mode all operations return immediately, but more care should be taken about handling them in your code properly.

Here are a few highlights of each mode.

Synchronous mode:

• All operations are performed within the caller thread context
• Operations like Connect or SendBytes may block
• Use Poll to check for the availability of data before reading it out with Receive or ReceiveBytes
• Return of a call guarantees completion of the operation
• Connection errors are reported straight from the methods via exceptions

Asynchronous mode:

• All operations are performed in a separate thread (and so are the event calls!)
• Methods like Send return immediately
• Use DataSent and DataReceived events to be notified about actual data transmissions
• Return of call only marks the beginning of the operation and does not guarantee its successful completion
• Connection errors are reported via Error event, often followed by Disconnect.

Please note that this is a very important and sensitive property, which has a wide-scale effect on the way the SSH client works and co-operates with the application. Depending on the value assigned to this setting you may need to work with the component very differently.

When setting this property to true, please make sure that your code is prepared to handle events coming from the context of a different thread.

AuthAttempts Property (SSHClient Class)

Specifies the number of SSH password authentication attempts.

Syntax

public int getAuthAttempts();


public void setAuthAttempts(int authAttempts);

Default Value

1

Remarks

In case of password authentication failure provide new password inside the AuthFailed event handler.

Commands Property (SSHClient Class)

Specifies the list of commands to execute.

Syntax

public String getCommands();


public void setCommands(String commands);

Default Value

""

Remarks

Use this property to provide a list of commands to execute remotely. Separate different commands with EOL characters.

When this property is set, the component works in the command mode, meaning each command is executed in its own virtual terminal session. No shell connection is established.

If no commands are provided via this property, the component will establish a shell session.

Connected Property (SSHClient Class)

Specifies whether the client is connected to the SFTP server.

Syntax

public boolean isConnected();

Default Value

False

Remarks

Use this read-only property to check whether the client is connected to the server.

This property is read-only.

ConnectionInfo Property (SSHClient Class)

Contains the secure connection info.

Syntax

public SSHConnectionInfo getConnectionInfo();

Remarks

This property contains various information about the secure connection.

This property is read-only.

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

ExitMessage Property (SSHClient Class)

Contains the last commands exit message.

Syntax

public String getExitMessage();

Default Value

""

Remarks

Use this property to access the exit message of the last command or shell session. This property normally gets assigned if the command or shell was closed due to an error.

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

ExitSignal Property (SSHClient Class)

Contains the last commands exit signal.

Syntax

public String getExitSignal();

Default Value

""

Remarks

Use this property to access the exit signal of the last command or shell session. This property normally gets assigned if the command or shell was closed due to an error.

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

ExitStatus Property (SSHClient Class)

Contains the last commands exit status.

Syntax

public int getExitStatus();

Default Value

0

Remarks

Check this property to obtain the exit status (also sometimes referred to as errorlevel) of the last command or shell session.

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

ExternalCrypto Property (SSHClient Class)

Provides access to external signing and DC parameters.

Syntax

public ExternalCrypto getExternalCrypto();

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 (SSHClient Class)

Reserved.

Syntax

public boolean isFIPSMode();


public void setFIPSMode(boolean FIPSMode);

Default Value

False

Remarks

This property is reserved for future use.

Key Property (SSHClient Class)

Contains client's SSH key.

Syntax

public SSHKey getKey();


public void setKey(SSHKey key);

Remarks

Server's public key is returned by ServerKey property.

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

Password Property (SSHClient Class)

Specifies user's password on the server.

Syntax

public String getPassword();


public void setPassword(String password);

Default Value

""

Remarks

Invalid password fires the AuthFailed event.

Proxy Property (SSHClient Class)

Allows connection through a proxy server.

Syntax

public ProxySettings getProxy();

Remarks

Set this property if the connection should be established through a proxy server.

This property is read-only.

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

ServerKey Property (SSHClient Class)

Returns server's public key.

Syntax

public SSHKey getServerKey();

Remarks

Client's SSH key is specified by Key.

This property is read-only.

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

SocketSettings Property (SSHClient Class)

Manages network connection settings.

Syntax

public SocketSettings getSocketSettings();

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 (SSHClient Class)

Provides access to SSH connection settings.

Syntax

public SSHSettings getSSHSettings();

Remarks

Use this property to configure SSH protocol settings.

This property is read-only.

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

Subsystem Property (SSHClient Class)

Specifies the subsystem to request from the server.

Syntax

public String getSubsystem();


public void setSubsystem(String subsystem);

Default Value

""

Remarks

Subsystem is a special form of an SSH channel. It is typically used to transfer third-party protocol data, with SFTP being the most widely known.

You can tell class to set up a subsystem connection (rather than a shell or command) by assigning the subsystem name to this property.

Terminal Property (SSHClient Class)

Provides access to SSH terminal settings object.

Syntax

public SSHTerm getTerminal();

Remarks

Use this property to configure the pseudo-terminal parameters before opening a shell or command connection.

This property is read-only.

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

TrustedKeysFile Property (SSHClient Class)

Path to the file containing public keys of authorized servers.

Syntax

public String getTrustedKeysFile();


public void setTrustedKeysFile(String trustedKeysFile);

Default Value

""

Remarks

Path to the file containing public keys of authorized servers.

Username Property (SSHClient Class)

Specifies client's username on the server.

Syntax

public String getUsername();


public void setUsername(String username);

Default Value

""

Remarks

Client's password is set by Password property. ;

Config Method (SSHClient Class)

Sets or retrieves a configuration setting.

Syntax

public String config(String configurationString);

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.

Connect Method (SSHClient Class)

Establishes connection to an SSH server.

Syntax

public void connect(String address, int port);

Remarks

Use this method to connect to the SSH server by providing its Address and Port.

Before connecting to the server you might want to set up your credentials using Username and Password properties. You might also need to configure the server key validation routine. You can do this by subscribing to KnownKeyReceived and UnknownKeyReceived events and implementing the event handlers as required.

Adjust AsyncMode before connecting to switch the component to either synchronous or asynchronous mode. In synchronous mode, all the calls to the component, such as Connect or SendBytes, are executed within the context of the caller thread, and block until the action completes. In asynchronous mode, the component runs the SSH session in a background thread, which makes all such calls return immediately. Find out more about the modes in the AsyncMode topic.

ConnectAndExec Method (SSHClient Class)

Connects to an SSH server and executes a command in one go.

Syntax

public byte[] connectAndExec(String address, int port, String command, boolean wantStdout, boolean wantStdErr);

Remarks

Use this method to connect to an SSH server at Address and Port and execute a command. The method returns the output of the executed command.

This method is a handy shortcut for running non-interactive commands. It encapsulates calls to Connect, Receive, Disconnect internally to save you time and space.

Please note that ConnectAndExec always runs synchronously, thus ignoring the AsyncMode setting.

Disconnect Method (SSHClient Class)

Closes connection to the SSH server.

Syntax

public void disconnect();

Remarks

Call this method to terminate the active SSH connection.

Please note that in some cases the component may still have some inbound data cached internally even after the connection is closed. You can read that data out using Receive and/or ReceiveBytes methods.

DoAction Method (SSHClient Class)

Performs an additional action.

Syntax

public String doAction(String actionID, String actionParams);

Remarks

DoAction is a generic method available in every class. 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;....

Ping Method (SSHClient Class)

Sends a keep-alive request to the SSH server.

Syntax

public void ping();

Remarks

Use this method to send a keep-alive message to the SSH server. Keep-alive messages are empty data packets which carry no useful information but are a handy way of checking if the connection is still alive.

Poll Method (SSHClient Class)

Checks whether there is any inbound data readily available.

Syntax

public boolean poll(int milliseconds);

Remarks

Use this method to check whether there is any incoming data available in the connection. If this method returns true, you can read the data with Receive or ReceiveBytes calls.

Use the Milliseconds parameter to tell the component how long it can wait for the data to arrive.

Receive Method (SSHClient Class)

Reads a portion of received data into a string.

Syntax

public String receive();

Remarks

Use this method to read out a piece of data received from the server into a string.

Note that in synchronous mode this method may block in the absence of any inbound data until the next piece of data is received from the server. Use Poll to check if there is any data in the connection that is immediately available for reading.

In asynchronous mode a good time to call this method is upon receiving a read notification in DataReceived event handler. When working in asynchronous mode, this call returns immediately.

This method only returns data that arrives via the stdout channel. Use ReceiveFrom to read stderr data.

ReceiveBytes Method (SSHClient Class)

Reads a portion of received data into a byte array.

Syntax

public byte[] receiveBytes(int maxLen);

Remarks

Use this method to read out a piece of data received from the server into a byte array. Control the maximum length of the data chunk with the MaxLen parameter.

Note that in synchronous mode this method may block in the absence of any inbound data until the next piece of data is received from the server. Use Poll to check if there is any data in the connection that is immediately available for reading.

In asynchronous mode a good time to call this method is upon receiving a read notification in DataReceived event handler. When working in asynchronous mode, this call returns immediately.

This method only returns data that arrives via the stdout channel. Use ReceiveBytesFrom to read stderr data.

ReceiveBytesFrom Method (SSHClient Class)

Reads a portion of data received via a specific channel into a byte array.

Syntax

public byte[] receiveBytesFrom(int channel, int maxLen);

Remarks

Use this method to read out a piece of data received from the server into a byte array. Specify the channel that you are interested in reading from (0 for stdout, 1 for stderr) via the Channel parameter, and control the maximum length of the data chunk with the MaxLen parameter.

Note that in synchronous mode this method may block in the absence of any inbound data until the next piece of data is received from the server. Use Poll to check if there is any data in the connection that is immediately available for reading.

In asynchronous mode a good time to call this method is upon receiving a read notification in DataReceived event handler. When working in asynchronous mode, this call returns immediately.

Please also note that stdout and stderr channels are fully independent, which implies that data arriving via each channel should be read out separately.

ReceiveFrom Method (SSHClient Class)

Reads a portion of data received via a specific channel into a string.

Syntax

public String receiveFrom(int channel);

Remarks

Use this method to read out a piece of data received from the server into a string. Use the Channel parameter to specify the channel that you would like to read from (0 for stdout, 1 for stderr).

Note that in synchronous mode this method may block in the absence of any inbound data until the next piece of data is received from the server. Use Poll to check if there is any data in the connection that is immediately available for reading.

In asynchronous mode a good time to call this method is upon receiving a read notification in DataReceived event handler. When working in asynchronous mode, this call returns immediately.

Reset Method (SSHClient Class)

Resets the class settings.

Syntax

public void reset();

Remarks

Reset is a generic method available in every class.

Send Method (SSHClient Class)

Sends a string to the server.

Syntax

public void send(String dataStr, boolean addEOL);

Remarks

Use this method to send DataStr to the remote command's stdin channel. Set the AddEOL parameter to true to append the end-of-line character to the string automatically.

Note that in synchronous mode this method may block until the whole string is commited to the network connection. In asynchronous mode this method returns immediately; the application is eventually notified that the data has been sent via the DataSent event.

SendBytes Method (SSHClient Class)

Sends an array of bytes to the server.

Syntax

public void sendBytes(byte[] data);

Remarks

Use this method to send Data to the remote command's stdin channel.

Note that in synchronous mode this method may block until the whole byte array is commited to the network connection. In asynchronous mode this method returns immediately; the application is eventually notified that the data has been sent via the DataSent event.

SendSpecial Method (SSHClient Class)

Sends a special character to the server or remote command.

Syntax

public void sendSpecial(String specialChar);

Remarks

Use this method to send a special or control character to the SSH server or the command being executed. Specify the character id via the SpecialChar parameter.

Currently the only supported special character is "eof", which is sometimes used as a way to close the stdin channel gracefully.

AuthAttempt Event (SSHClient Class)

Fires when a single authentication attempt is performed.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void authAttempt(SSHClientAuthAttemptEvent e) {}
  ...
}

public class SSHClientAuthAttemptEvent {
  public int authType;
}

Remarks

This event is fired each time a single authentication attempt is performed. AuthType parameter specifies the type of authentication. Note, this event could be fired more than once if the client tries different authentication methods one after another.

AuthFailed Event (SSHClient Class)

Fires when a single authentication attempt is failed.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void authFailed(SSHClientAuthFailedEvent e) {}
  ...
}

public class SSHClientAuthFailedEvent {
  public int authenticationType;
}

Remarks

This event is fired each time a single authentication attempt fails. AuthType parameter specifies the type of authentication.

As SSH may try a number of authentication attempts of different types or with different parameters (such as public keys) during one session, this event may be fired more than once. It is not critical and may not lead to closing of the connection.

AuthSucceeded Event (SSHClient Class)

Reports a successful authentication.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void authSucceeded(SSHClientAuthSucceededEvent e) {}
  ...
}

public class SSHClientAuthSucceededEvent {
}

Remarks

This event may be preceded by some AuthFailed events if the client tries different authentication methods one after another.

Banner Event (SSHClient Class)

Reports the receipt of the Hello message from the server.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void banner(SSHClientBannerEvent e) {}
  ...
}

public class SSHClientBannerEvent {
  public byte[] text;
  public byte[] language;
}

Remarks

SFPTClient fires this event when it receives hello message from the server.

CommandCompleted Event (SSHClient Class)

Signifies completion of the command execution.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void commandCompleted(SSHClientCommandCompletedEvent e) {}
  ...
}

public class SSHClientCommandCompletedEvent {
  public String command;
  public int exitStatus;
  public String exitMessage;
  public String exitSignal;
}

Remarks

Subscribe to this event to be notified about completion of the remote command execution. This event fires for every command in the Commands list. The Command parameter indicates the command being completed.

ExitStatus specifies the command's return code. ExitMessage or ExitSignal parameters provide error details if the command execution was terminated forcefully,

CommandStart Event (SSHClient Class)

Marks the commencement of a command execution.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void commandStart(SSHClientCommandStartEvent e) {}
  ...
}

public class SSHClientCommandStartEvent {
  public String command;
}

Remarks

Subscribe to this event to be notified about the start of execution of a remote command. The Command parameter indicates the command being started.

This event is fired for all commands in the Commands list, in order. The completion of the command is reported via the CommandCompleted event.

Connect Event (SSHClient Class)

This event is fired when an SSH session has been established.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void connect(SSHClientConnectEvent e) {}
  ...
}

public class SSHClientConnectEvent {
}

Remarks

Use this event to track the moment when SSH session has been set up.

DataReceived Event (SSHClient Class)

Reports receipt of another chunk of data from the server.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void dataReceived(SSHClientDataReceivedEvent e) {}
  ...
}

public class SSHClientDataReceivedEvent {
  public int channel;
  public int bytesReceived;
  public int totalBytesPending;
}

Remarks

This event fires in asynchronous mode to report the receipt of another chunk of data from the server. Use Receive or ReceiveBytes methods to read out the received data.

The Channel parameter indicates the channel on which the data was received: stdout (0) or stderr (1). BytesReceived specify the size of the newly received chunk, and TotalBytesPending contain the total number of bytes available for reading.

Please note that just like other asynchronous mode events this event may fire from a secondary thread. Please make sure your code is prepared for that by using appropriate synchronization facilities.

This event does not fire in synchronous mode.

DataSent Event (SSHClient Class)

Notifies the application that a piece of data has been sent to the server.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void dataSent(SSHClientDataSentEvent e) {}
  ...
}

public class SSHClientDataSentEvent {
  public int bytesSent;
  public int bytesPending;
}

Remarks

Subscribe to this event to be notified about the outbound data flow. This event fires following a call to Send or SendBytes methods to notify the application that the data provided has been sent to the server. This event may fire more than once for each Send or SendBytes call, subject to the volume of data being sent and the settings of the server.

The BytesSent parameter specifies the number of bytes that has just been sent to the server. The BytesPending indicate the number of bytes that remain cached in the internal buffer. Any bytes cached in such way will be sent again on the next available opportunity and reported via a separate DataSent event invocation.

Please note that just like other asynchronous mode events this event may fire from a secondary thread. Please make sure your code is prepared for that by using appropriate synchronization facilities.

This event does not fire in synchronous mode.

Disconnect Event (SSHClient Class)

This event is fired when the SFTP subsystem connection is closed.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void disconnect(SSHClientDisconnectEvent e) {}
  ...
}

public class SSHClientDisconnectEvent {
  public int closeReason;
}

Remarks

Do not perform any file operations after this event has been fired.

Error Event (SSHClient Class)

Information about errors during SFTP connection.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void error(SSHClientErrorEvent e) {}
  ...
}

public class SSHClientErrorEvent {
  public int errorCode;
  public String description;
}

Remarks

The event is fired in case of exceptional conditions during data transfer.

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

ExternalSign Event (SSHClient Class)

Handles remote or external signing initiated by the SignExternal method or other source.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void externalSign(SSHClientExternalSignEvent e) {}
  ...
}

public class SSHClientExternalSignEvent {
  public String operationId;
  public String hashAlgorithm;
  public String pars;
  public String data;
  public String signedData; //read-write
}

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 class via the SignedData parameter.

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

The class 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(); };

KnownKeyReceived Event (SSHClient Class)

Signals that the server has introduced itself with a known key.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void knownKeyReceived(SSHClientKnownKeyReceivedEvent e) {}
  ...
}

public class SSHClientKnownKeyReceivedEvent {
  public String algorithm;
  public int bits;
  public String fingerprintSHA256;
}

Remarks

The class fires this event to tell the application that the server has introduced itself with a known key from TrustedKeysFile.

The details of the key are provided: Algorithm and Bits specify the key algorithm and the number of bits. FingerprintSHA256 contains the key's fingerprint.

Use ServerKey to access more key details.

Notification Event (SSHClient Class)

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

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void notification(SSHClientNotificationEvent e) {}
  ...
}

public class SSHClientNotificationEvent {
  public String eventID;
  public String eventParam;
}

Remarks

The class fires this event to let the application know about some event, occurrence, or milestone in the class. 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 class, the exact action it is performing, or the document being processed, one or both may be omitted.

PasswordChangeRequest Event (SSHClient Class)

This event is fired when a password change is requested.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void passwordChangeRequest(SSHClientPasswordChangeRequestEvent e) {}
  ...
}

public class SSHClientPasswordChangeRequestEvent {
  public String prompt;
  public String newPassword; //read-write
  public boolean cancel; //read-write
}

Remarks

This event is fired by the class when a password change is requested by the server. Prompt contains the password prompt message. Handler should either provide the new password via NewPassword, or deny the request by setting Cancel to true.

PrivateKeyNeeded Event (SSHClient Class)

This event is fired when client's public key was accepted by the server, but the corresponding secret key is not available.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void privateKeyNeeded(SSHClientPrivateKeyNeededEvent e) {}
  ...
}

public class SSHClientPrivateKeyNeededEvent {
  public boolean skip; //read-write
}

Remarks

Set Skip to true when it is not possible to load the missing key for some reason.

UnknownKeyReceived Event (SSHClient Class)

Signals that the server has introduced itself with an unknown key.

Syntax

public class DefaultSSHClientEventListener implements SSHClientEventListener {
  ...
  public void unknownKeyReceived(SSHClientUnknownKeyReceivedEvent e) {}
  ...
}

public class SSHClientUnknownKeyReceivedEvent {
  public String algorithm;
  public int bits;
  public String fingerprintSHA256;
  public int action; //read-write
}

Remarks

The class fires this event to tell the application that the server has introduced itself with a key not present in TrustedKeysFile.

The details of the key are provided: Algorithm and Bits specify the key algorithm and the number of bits. FingerprintSHA256 contains the key's fingerprint.

In this event handler, you need to make a decision whether to proceed with the connection. Use Action to tell the class what it should do with the key:

Note that accepting an unknown and unchecked key may be risky.

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.

Fields

Constructors

public ExternalCrypto();

ProxySettings Type

A container for proxy server settings.

Remarks

This type exposes a collection of properties for tuning up the proxy server configuration.

Fields

Constructors

public ProxySettings();

SocketSettings Type

A container for the socket settings.

Remarks

This type is a container for socket-layer parameters.

Fields

Constructors

public SocketSettings();

SSHConnectionInfo Type

Contains information about SSH connection.

Remarks

SSHConnectionInfo object contains information about one SSH connection.

Fields

Constructors

public SSHConnectionInfo();

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.

Fields

Constructors

public SSHKey( bytes,  startIndex,  count,  password);

public SSHKey( bytes,  startIndex,  count);

public SSHKey( stream,  password);

public SSHKey( stream);

public SSHKey( path,  password);

public SSHKey( path);

public SSHKey();

SSHSettings Type

A container for various SSH protocol settings.

Remarks

SSHSettings stores various settings of SSH client or server.

Fields

Constructors

public SSHSettings();

SSHTerm Type

A container for SSH terminal settings.

Remarks

SSHTerm stores terminal settings of the SSH client.

Fields

Config Settings (SSHClient Class)

The class 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 class, access to these internal properties is provided through the Config method.

SSHClient Config Settings

Base Config Settings

Trappable Errors (SSHClient Class)