SSHReverseTunnel Control

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The SSHReverseTunnel control provides a simple way to establish a reverse tunnel with a Secure Shell (SSH) host.

Syntax

SSHReverseTunnel

Remarks

The SSHReverseTunnel control may be used to establish a reverse tunnel with a Secure Shell (SSH) host. The SSH host will listen for incoming connections on the specified port and forward traffic to the control through the SSH tunnel.

The SSHHost and SSHPort properties specify which Secure Shell (SSH) server to use. The SSHUser and SSHPassword properties allow the client to authenticate itself with the server. The SSHServerAuthentication event or SSHAcceptServerHostKey property allow you to check the server identity. Finally, the SSHStatus event provides information about the SSH handshake.

To begin, call SSHLogon to connect to the SSH host. After this method returns, the connectionto the SSH server is successfully established. Call RequestForwarding to establish a reverse tunnel. This method takes parameters to tell the SSH host on which port to listen.

The control has two modes that allow data to be dealt with directly from the events, or automatically forwarded on to a different endpoint.

Event Based Operation

In this mode, any data received by the control over the tunnel causes the events of the control to fire. For instance:

SSHReverseTunnel.RequestForwarding("0.0.0.0", 777, "", 0);

In the above code, forwarding is requested from port 777 on the SSHHost. Any data received on port 777 by the SSHHost will be sent to the control. In the above code, the last two parameters are empty and 0, indicating to the control that no local forwarding is requested.

Once RequestForwarding returns, the Secure Shell (SSH) reverse tunnel is established. Any connection made to the SSH host on the specified port will then trigger the control's events to fire, allowing you to handle the connection request and data.

When a client connects to the SSH host on the specified port, the SSHChannelOpenRequest event will fire. Within this event, choose to accept or reject the connection by setting the Accept parameter. This event contains details about the connection that may be used when determining whether to accept the connection.

After the channel is established, data are received through the SSHChannelData event. Call the SendChannelData method to send data over the channel, and call the CloseChannel method to close the channel.

Local Forwarding

In this mode, any data received by the control is automatically forwarded to a separate endpoint. This allows the control to act as a sort of proxy. There is no need to handle data directly in this case. For instance: SSHReverseTunnel.RequestForwarding("0.0.0.0", 777, "nsoftware.com", 80);

In the above code, forwarding is requested from port 777 on SSHHost. The control is instructed to establish a connection to "nsoftware.com" on port 80 when a client connects to SSHHost on port 777. Any data received from the client connected to SSHHost on port 777 will automatically be forwarded to "nsoftware.com" on port 80. Any data received back from "nsoftware.com" on port 80 will be sent back to the connected client.

In this mode, data may flow freely from the client connected to the SSHHost to the endpoint specified in the RequestForwarding method without any additional code required.

Note: The following events are applicable when a connection is made to the SSH host:

• SSHChannelClosed
• SSHChannelData
• SSHChannelEOF
• SSHChannelOpened
• SSHChannelOpenRequest
• SSHChannelReadyToSend
• SSHChannelRequested

To stop a previously established reverse tunnel, call the CancelForwarding method.

Property List

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

Method List

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

Event List

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

Config Settings

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

SSHChannelCount Property (SSHReverseTunnel Control)

The number of records in the arrays.

Syntax

sshreversetunnelcontrol.SSHChannelCount

Default Value

0

Remarks

This property controls the size of the following arrays:

• BytesSent
• ChannelId
• ConnectedAddress
• ConnectedPort
• FirewallAutoDetect
• FirewallHost
• FirewallPassword
• FirewallPort
• FirewallType
• FirewallUser
• ForwardingHost
• ForwardingPort
• OriginAddress
• OriginPort
• Service
• SSHAcceptServerHostKeyEffectiveDate
• SSHAcceptServerHostKeyEncoded
• SSHAcceptServerHostKeyExpirationDate
• SSHAcceptServerHostKeyExtendedKeyUsage
• SSHAcceptServerHostKeyFingerprint
• SSHAcceptServerHostKeyFingerprintSHA1
• SSHAcceptServerHostKeyFingerprintSHA256
• SSHAcceptServerHostKeyIssuer
• SSHAcceptServerHostKeyPrivateKey
• SSHAcceptServerHostKeyPrivateKeyAvailable
• SSHAcceptServerHostKeyPrivateKeyContainer
• SSHAcceptServerHostKeyPublicKey
• SSHAcceptServerHostKeyPublicKeyAlgorithm
• SSHAcceptServerHostKeyPublicKeyLength
• SSHAcceptServerHostKeySerialNumber
• SSHAcceptServerHostKeySignatureAlgorithm
• SSHAcceptServerHostKeyStore
• SSHAcceptServerHostKeyStorePassword
• SSHAcceptServerHostKeyStoreType
• SSHAcceptServerHostKeySubject
• SSHAcceptServerHostKeySubjectAltNames
• SSHAcceptServerHostKeyThumbprintMD5
• SSHAcceptServerHostKeyThumbprintSHA1
• SSHAcceptServerHostKeyThumbprintSHA256
• SSHAcceptServerHostKeyUsage
• SSHAcceptServerHostKeyUsageFlags
• SSHAcceptServerHostKeyVersion
• SSHCertEffectiveDate
• SSHCertEncoded
• SSHCertExpirationDate
• SSHCertExtendedKeyUsage
• SSHCertFingerprint
• SSHCertFingerprintSHA1
• SSHCertFingerprintSHA256
• SSHCertIssuer
• SSHCertPrivateKey
• SSHCertPrivateKeyAvailable
• SSHCertPrivateKeyContainer
• SSHCertPublicKey
• SSHCertPublicKeyAlgorithm
• SSHCertPublicKeyLength
• SSHCertSerialNumber
• SSHCertSignatureAlgorithm
• SSHCertStore
• SSHCertStorePassword
• SSHCertStoreType
• SSHCertSubject
• SSHCertSubjectAltNames
• SSHCertThumbprintMD5
• SSHCertThumbprintSHA1
• SSHCertThumbprintSHA256
• SSHCertUsage
• SSHCertUsageFlags
• SSHCertVersion

The array indices start at 0 and end at SSHChannelCount - 1.

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

Data Type

Integer

BytesSent Property (SSHReverseTunnel Control)

This property specifies the number of bytes actually sent after a sending channel data.

Syntax

sshreversetunnelcontrol.BytesSent(SSHChannelId)

Default Value

0

Remarks

This property specifies the number of bytes actually sent after a sending channel data.

The SSHChannelId parameter specifies the index of the item in the array. The size of the array is controlled by the SSHChannelCount property.

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

Data Type

Integer

ChannelId Property (SSHReverseTunnel Control)

This property provides an Id generated by the control to identify the current Secure Shell (SSH) channel.

Syntax

sshreversetunnelcontrol.ChannelId(SSHChannelId)

Default Value

""

Remarks

This property provides an Id generated by the control to identify the current Secure Shell (SSH) channel.

This Id is unique to this channel.

The SSHChannelId parameter specifies the index of the item in the array. The size of the array is controlled by the SSHChannelCount property.

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

Data Type

String

ConnectedAddress Property (SSHReverseTunnel Control)

This property holds the remote address to which the connection was established.

Syntax

sshreversetunnelcontrol.ConnectedAddress(SSHChannelId)

Default Value

""

Remarks

This property holds the remote address to which the connection was established. This should match the Address parameter passed to the RequestForwarding method.

The SSHChannelId parameter specifies the index of the item in the array. The size of the array is controlled by the SSHChannelCount property.

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

Data Type

String

ConnectedPort Property (SSHReverseTunnel Control)

This property holds the remote port to which the connection was established.

Syntax

sshreversetunnelcontrol.ConnectedPort(SSHChannelId)

Default Value

0

Remarks

This property holds the remote port to which the connection was established. This should match the Port parameter passed to the RequestForwarding method.

The SSHChannelId parameter specifies the index of the item in the array. The size of the array is controlled by the SSHChannelCount property.

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

Data Type

Integer

ForwardingHost Property (SSHReverseTunnel Control)

This property holds the host to which incoming traffic is forwarded.

Syntax

sshreversetunnelcontrol.ForwardingHost(SSHChannelId)

Default Value

""

Remarks

This property holds the host to which incoming traffic is forwarded. This is applicable only if local forwarding was requested when calling RequestForwarding.

The SSHChannelId parameter specifies the index of the item in the array. The size of the array is controlled by the SSHChannelCount property.

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

Data Type

String

ForwardingPort Property (SSHReverseTunnel Control)

This property holds the port to which incoming traffic is forwarded.

Syntax

sshreversetunnelcontrol.ForwardingPort(SSHChannelId)

Default Value

0

Remarks

This property holds the port to which incoming traffic is forwarded. This is applicable only if local forwarding was requested when calling RequestForwarding.

The SSHChannelId parameter specifies the index of the item in the array. The size of the array is controlled by the SSHChannelCount property.

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

Data Type

Integer

OriginAddress Property (SSHReverseTunnel Control)

This property holds the address of the client that originated the connection to the reverse tunnel on SSHHost .

Syntax

sshreversetunnelcontrol.OriginAddress(SSHChannelId)

Default Value

""

Remarks

This property holds the address of the client that originated the connection to the reverse tunnel on SSHHost.

The SSHChannelId parameter specifies the index of the item in the array. The size of the array is controlled by the SSHChannelCount property.

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

Data Type

String

OriginPort Property (SSHReverseTunnel Control)

This property holds the port used by the client that originated the connection to the reverse tunnel on SSHHost .

Syntax

sshreversetunnelcontrol.OriginPort(SSHChannelId)

Default Value

0

Remarks

This property holds the port used by the client that originated the connection to the reverse tunnel on SSHHost.

The SSHChannelId parameter specifies the index of the item in the array. The size of the array is controlled by the SSHChannelCount property.

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

Data Type

Integer

Service Property (SSHReverseTunnel Control)

This property holds the channel type that was requested when opening the channel.

Syntax

sshreversetunnelcontrol.Service(SSHChannelId)

Default Value

""

Remarks

This property holds the channel type that was requested when opening the channel. For instance "session" or "forwarded-tcpip".

The SSHChannelId parameter specifies the index of the item in the array. The size of the array is controlled by the SSHChannelCount property.

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

Data Type

String

Connected Property (SSHReverseTunnel Control)

The control to be connected.

Syntax

sshreversetunnelcontrol.Connected

Default Value

False

Remarks

This property is used to determine whether or not the control is connected to the remote host. Use the SSHLogon and SSHLogoff methods to manage the connection.

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

Data Type

Boolean

FirewallAutoDetect Property (SSHReverseTunnel Control)

Whether to automatically detect and use firewall system settings, if available.

Syntax

sshreversetunnelcontrol.FirewallAutoDetect[=boolean]

Default Value

False

Remarks

Whether to automatically detect and use firewall system settings, if available.

Data Type

Boolean

FirewallType Property (SSHReverseTunnel Control)

The type of firewall to connect through.

Syntax

sshreversetunnelcontrol.FirewallType[=integer]

Possible Values

fwNone(0), 
fwTunnel(1), 
fwSOCKS4(2), 
fwSOCKS5(3), 
fwSOCKS4A(10)

Default Value

0

Remarks

The type of firewall to connect through. The applicable values are as follows:

Data Type

Integer

FirewallHost Property (SSHReverseTunnel Control)

The name or IP address of the firewall (optional).

Syntax

sshreversetunnelcontrol.FirewallHost[=string]

Default Value

""

Remarks

The name or IP address of the firewall (optional). If a FirewallHost is given, the requested connections will be authenticated through the specified firewall when connecting.

If this property is set to a Domain Name, a DNS request is initiated. Upon successful termination of the request, this property is set to the corresponding address. If the search is not successful, the control fails with an error.

Data Type

String

FirewallPassword Property (SSHReverseTunnel Control)

A password if authentication is to be used when connecting through the firewall.

Syntax

sshreversetunnelcontrol.FirewallPassword[=string]

Default Value

""

Remarks

A password if authentication is to be used when connecting through the firewall. If FirewallHost is specified, the FirewallUser and FirewallPassword properties are used to connect and authenticate to the given firewall. If the authentication fails, the control fails with an error.

Data Type

String

FirewallPort Property (SSHReverseTunnel Control)

The Transmission Control Protocol (TCP) port for the firewall Host .

Syntax

sshreversetunnelcontrol.FirewallPort[=integer]

Default Value

0

Remarks

The Transmission Control Protocol (TCP) port for the firewall FirewallHost. See the description of the FirewallHost property for details.

Note: This property is set automatically when FirewallType is set to a valid value. See the description of the FirewallType property for details.

Data Type

Integer

FirewallUser Property (SSHReverseTunnel Control)

A username if authentication is to be used when connecting through a firewall.

Syntax

sshreversetunnelcontrol.FirewallUser[=string]

Default Value

""

Remarks

A username if authentication is to be used when connecting through a firewall. If FirewallHost is specified, this property and the FirewallPassword property are used to connect and authenticate to the given Firewall. If the authentication fails, the control fails with an error.

Data Type

String

LocalHost Property (SSHReverseTunnel Control)

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

Syntax

sshreversetunnelcontrol.LocalHost[=string]

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 control initiate connections (or accept in the case of server controls) 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 control 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.

Data Type

String

LocalPort Property (SSHReverseTunnel Control)

The TCP port in the local host where the control binds.

Syntax

sshreversetunnelcontrol.LocalPort[=integer]

Default Value

0

Remarks

This property must be set before a connection is attempted. It instructs the control to bind to a specific port (or communication endpoint) in the local machine.

Setting this property to 0 (default) enables the system to choose an open port at random. The chosen port will be returned by the LocalPort property after the connection is established.

LocalPort cannot be changed once a connection is made. Any attempt to set this property when a connection is active will generate an error.

This property is useful when trying to connect to services that require a trusted port on the client side.

Data Type

Integer

SSHAcceptServerHostKeyEffectiveDate Property (SSHReverseTunnel Control)

The date on which this certificate becomes valid.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyEffectiveDate

Default Value

""

Remarks

The date on which this certificate becomes valid. Before this date, it is not valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2000 15:00:00.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyExpirationDate Property (SSHReverseTunnel Control)

The date on which the certificate expires.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyExpirationDate

Default Value

""

Remarks

The date on which the certificate expires. After this date, the certificate will no longer be valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2001 15:00:00.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyExtendedKeyUsage Property (SSHReverseTunnel Control)

A comma-delimited list of extended key usage identifiers.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyExtendedKeyUsage

Default Value

""

Remarks

A comma-delimited list of extended key usage identifiers. These are the same as ASN.1 object identifiers (OIDs).

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyFingerprint Property (SSHReverseTunnel Control)

The hex-encoded, 16-byte MD5 fingerprint of the certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyFingerprint

Default Value

""

Remarks

The hex-encoded, 16-byte MD5 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyFingerprintSHA1 Property (SSHReverseTunnel Control)

The hex-encoded, 20-byte SHA-1 fingerprint of the certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyFingerprintSHA1

Default Value

""

Remarks

The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: 30:7b:fa:38:65:83:ff:da:b4:4e:07:3f:17:b8:a4:ed:80:be:ff:84

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyFingerprintSHA256 Property (SSHReverseTunnel Control)

The hex-encoded, 32-byte SHA-256 fingerprint of the certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyFingerprintSHA256

Default Value

""

Remarks

The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: 6a:80:5c:33:a9:43:ea:b0:96:12:8a:64:96:30:ef:4a:8a:96:86:ce:f4:c7:be:10:24:8e:2b:60:9e:f3:59:53

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyIssuer Property (SSHReverseTunnel Control)

The issuer of the certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyIssuer

Default Value

""

Remarks

The issuer of the certificate. This property contains a string representation of the name of the issuing authority for the certificate.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyPrivateKey Property (SSHReverseTunnel Control)

The private key of the certificate (if available).

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyPrivateKey

Default Value

""

Remarks

The private key of the certificate (if available). The key is provided as PEM/Base64-encoded data.

Note: The SSHAcceptServerHostKeyPrivateKey may be available but not exportable. In this case, SSHAcceptServerHostKeyPrivateKey returns an empty string.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyPrivateKeyAvailable Property (SSHReverseTunnel Control)

Whether a PrivateKey is available for the selected certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyPrivateKeyAvailable

Default Value

False

Remarks

Whether a SSHAcceptServerHostKeyPrivateKey is available for the selected certificate. If SSHAcceptServerHostKeyPrivateKeyAvailable is True, the certificate may be used for authentication purposes (e.g., server authentication).

This property is read-only.

Data Type

Boolean

SSHAcceptServerHostKeyPrivateKeyContainer Property (SSHReverseTunnel Control)

The name of the PrivateKey container for the certificate (if available).

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyPrivateKeyContainer

Default Value

""

Remarks

The name of the SSHAcceptServerHostKeyPrivateKey container for the certificate (if available). This functionality is available only on Windows platforms.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyPublicKey Property (SSHReverseTunnel Control)

The public key of the certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyPublicKey

Default Value

""

Remarks

The public key of the certificate. The key is provided as PEM/Base64-encoded data.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyPublicKeyAlgorithm Property (SSHReverseTunnel Control)

The textual description of the certificate's public key algorithm.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyPublicKeyAlgorithm

Default Value

""

Remarks

The textual description of the certificate's public key algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_DH") or an object identifier (OID) string representing the algorithm.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyPublicKeyLength Property (SSHReverseTunnel Control)

The length of the certificate's public key (in bits).

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyPublicKeyLength

Default Value

0

Remarks

The length of the certificate's public key (in bits). Common values are 512, 1024, and 2048.

This property is read-only.

Data Type

Integer

SSHAcceptServerHostKeySerialNumber Property (SSHReverseTunnel Control)

The serial number of the certificate encoded as a string.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeySerialNumber

Default Value

""

Remarks

The serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, with each pair representing a byte of the serial number.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeySignatureAlgorithm Property (SSHReverseTunnel Control)

The text description of the certificate's signature algorithm.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeySignatureAlgorithm

Default Value

""

Remarks

The text description of the certificate's signature algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_MD5RSA") or an object identifier (OID) string representing the algorithm.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyStore Property (SSHReverseTunnel Control)

The name of the certificate store for the client certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyStore[=string]

Default Value

"MY"

Remarks

The name of the certificate store for the client certificate.

The SSHAcceptServerHostKeyStoreType property denotes the type of the certificate store specified by SSHAcceptServerHostKeyStore. If the store is password-protected, specify the password in SSHAcceptServerHostKeyStorePassword.

SSHAcceptServerHostKeyStore is used in conjunction with the SSHAcceptServerHostKeySubject property to specify client certificates. If SSHAcceptServerHostKeyStore has a value, and SSHAcceptServerHostKeySubject or SSHAcceptServerHostKeyEncoded is set, a search for a certificate is initiated. Please see the SSHAcceptServerHostKeySubject property for details.

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).

To read or write binary data to the property, a Variant (Byte Array) version is provided in .SSHAcceptServerHostKeyStoreB.

Data Type

Binary String

SSHAcceptServerHostKeyStorePassword Property (SSHReverseTunnel Control)

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyStorePassword[=string]

Default Value

""

Remarks

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

Data Type

String

SSHAcceptServerHostKeyStoreType Property (SSHReverseTunnel Control)

The type of certificate store for this certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyStoreType[=integer]

Possible Values

cstUser(0), 
cstMachine(1), 
cstPFXFile(2), 
cstPFXBlob(3), 
cstJKSFile(4), 
cstJKSBlob(5), 
cstPEMKeyFile(6), 
cstPEMKeyBlob(7), 
cstPublicKeyFile(8), 
cstPublicKeyBlob(9), 
cstSSHPublicKeyBlob(10), 
cstP7BFile(11), 
cstP7BBlob(12), 
cstSSHPublicKeyFile(13), 
cstPPKFile(14), 
cstPPKBlob(15), 
cstXMLFile(16), 
cstXMLBlob(17), 
cstJWKFile(18), 
cstJWKBlob(19), 
cstSecurityKey(20), 
cstBCFKSFile(21), 
cstBCFKSBlob(22), 
cstPKCS11(23), 
cstAuto(99)

Default Value

0

Remarks

The type of certificate store for this certificate.

The control supports both public and private keys in a variety of formats. When the cstAuto value is used, the control will automatically determine the type. This property can take one of the following values:

Data Type

Integer

SSHAcceptServerHostKeySubjectAltNames Property (SSHReverseTunnel Control)

Comma-separated lists of alternative subject names for the certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeySubjectAltNames

Default Value

""

Remarks

Comma-separated lists of alternative subject names for the certificate.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyThumbprintMD5 Property (SSHReverseTunnel Control)

The MD5 hash of the certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyThumbprintMD5

Default Value

""

Remarks

The MD5 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyThumbprintSHA1 Property (SSHReverseTunnel Control)

The SHA-1 hash of the certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyThumbprintSHA1

Default Value

""

Remarks

The SHA-1 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyThumbprintSHA256 Property (SSHReverseTunnel Control)

The SHA-256 hash of the certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyThumbprintSHA256

Default Value

""

Remarks

The SHA-256 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyUsage Property (SSHReverseTunnel Control)

The text description of UsageFlags .

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyUsage

Default Value

""

Remarks

The text description of SSHAcceptServerHostKeyUsageFlags.

This value will be one or more of the following strings and will be separated by commas:

• Digital Signature
• Non-Repudiation
• Key Encipherment
• Data Encipherment
• Key Agreement
• Certificate Signing
• CRL Signing
• Encipher Only

If the provider is OpenSSL, the value is a comma-separated list of X.509 certificate extension names.

This property is read-only.

Data Type

String

SSHAcceptServerHostKeyUsageFlags Property (SSHReverseTunnel Control)

The flags that show intended use for the certificate.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyUsageFlags

Default Value

0

Remarks

The flags that show intended use for the certificate. The value of SSHAcceptServerHostKeyUsageFlags is a combination of the following flags:

Please see the SSHAcceptServerHostKeyUsage property for a text representation of SSHAcceptServerHostKeyUsageFlags.

This functionality currently is not available when the provider is OpenSSL.

This property is read-only.

Data Type

Integer

SSHAcceptServerHostKeyVersion Property (SSHReverseTunnel Control)

The certificate's version number.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyVersion

Default Value

""

Remarks

The certificate's version number. The possible values are the strings "V1", "V2", and "V3".

This property is read-only.

Data Type

String

SSHAcceptServerHostKeySubject Property (SSHReverseTunnel Control)

The subject of the certificate used for client authentication.

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeySubject[=string]

Default Value

""

Remarks

The subject of the certificate used for client authentication.

This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject.

If a matching certificate is found, the property is set to the full subject of the matching certificate.

If an exact match is not found, the store is searched for subjects containing the value of the property.

If a match is still not found, the property is set to an empty string, and no certificate is selected.

The special value "*" picks a random certificate in the certificate 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.

Data Type

String

SSHAcceptServerHostKeyEncoded Property (SSHReverseTunnel Control)

The certificate (PEM/Base64 encoded).

Syntax

sshreversetunnelcontrol.SSHAcceptServerHostKeyEncoded[=string]

Default Value

""

Remarks

The certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The SSHAcceptServerHostKeyStore and SSHAcceptServerHostKeySubject properties also may be used to specify a certificate.

When SSHAcceptServerHostKeyEncoded is set, a search is initiated in the current SSHAcceptServerHostKeyStore for the private key of the certificate. If the key is found, SSHAcceptServerHostKeySubject is updated to reflect the full subject of the selected certificate; otherwise, SSHAcceptServerHostKeySubject is set to an empty string.

To read or write binary data to the property, a Variant (Byte Array) version is provided in .SSHAcceptServerHostKeyEncodedB.

This property is not available at design time.

Data Type

Binary String

SSHAuthMode Property (SSHReverseTunnel Control)

The authentication method to be used with the control when calling SSHLogon .

Syntax

sshreversetunnelcontrol.SSHAuthMode[=integer]

Possible Values

amNone(0), 
amMultiFactor(1), 
amPassword(2), 
amPublicKey(3), 
amKeyboardInteractive(4), 
amGSSAPIWithMic(5), 
amGSSAPIKeyex(6), 
amCustom(99)

Default Value

2

Remarks

The Secure Shell (SSH) Authentication specification (RFC 4252) specifies multiple methods by which a user can be authenticated by an SSH server. When a call is made to SSHLogon, the control will connect to the SSH server and establish the security layer. After the connection has been secured, the client will send an authentication request to the SSHHost containing the SSHUser. The server will respond containing a list of methods by which that user may be authenticated.

The control will attempt to authenticate the user by one of those methods based on the value of SSHAuthMode and other property values supplied by the user. Currently, the control supports the following authentication methods:

Example 1. User/Password Authentication: Control.SSHAuthMode = SftpSSHAuthModes.amPassword Control.SSHUser = "username" Control.SSHPassword = "password" Control.SSHLogon("server", 22) Example 2. Public Key Authentication: Control.SSHAuthMode = SftpSSHAuthModes.amPublicKey Control.SSHUser = "username" Control.SSHCertStoreType = SSHCertStoreTypes.cstPFXFile; Control.SSHCertStore = "cert.pfx"; Control.SSHCertStorePassword = "certpassword"; Control.SSHCertSubject = "*"; Control.SSHLogon("server", 22)

Data Type

Integer

SSHCertEffectiveDate Property (SSHReverseTunnel Control)

The date on which this certificate becomes valid.

Syntax

sshreversetunnelcontrol.SSHCertEffectiveDate

Default Value

""

Remarks

The date on which this certificate becomes valid. Before this date, it is not valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2000 15:00:00.

This property is read-only.

Data Type

String

SSHCertExpirationDate Property (SSHReverseTunnel Control)

The date on which the certificate expires.

Syntax

sshreversetunnelcontrol.SSHCertExpirationDate

Default Value

""

Remarks

The date on which the certificate expires. After this date, the certificate will no longer be valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2001 15:00:00.

This property is read-only.

Data Type

String

SSHCertExtendedKeyUsage Property (SSHReverseTunnel Control)

A comma-delimited list of extended key usage identifiers.

Syntax

sshreversetunnelcontrol.SSHCertExtendedKeyUsage

Default Value

""

Remarks

A comma-delimited list of extended key usage identifiers. These are the same as ASN.1 object identifiers (OIDs).

This property is read-only.

Data Type

String

SSHCertFingerprint Property (SSHReverseTunnel Control)

The hex-encoded, 16-byte MD5 fingerprint of the certificate.

Syntax

sshreversetunnelcontrol.SSHCertFingerprint

Default Value

""

Remarks

The hex-encoded, 16-byte MD5 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02

This property is read-only.

Data Type

String

SSHCertFingerprintSHA1 Property (SSHReverseTunnel Control)

The hex-encoded, 20-byte SHA-1 fingerprint of the certificate.

Syntax

sshreversetunnelcontrol.SSHCertFingerprintSHA1

Default Value

""

Remarks

The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: 30:7b:fa:38:65:83:ff:da:b4:4e:07:3f:17:b8:a4:ed:80:be:ff:84

This property is read-only.

Data Type

String

SSHCertFingerprintSHA256 Property (SSHReverseTunnel Control)

The hex-encoded, 32-byte SHA-256 fingerprint of the certificate.

Syntax

sshreversetunnelcontrol.SSHCertFingerprintSHA256

Default Value

""

Remarks

The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: 6a:80:5c:33:a9:43:ea:b0:96:12:8a:64:96:30:ef:4a:8a:96:86:ce:f4:c7:be:10:24:8e:2b:60:9e:f3:59:53

This property is read-only.

Data Type

String

SSHCertIssuer Property (SSHReverseTunnel Control)

The issuer of the certificate.

Syntax

sshreversetunnelcontrol.SSHCertIssuer

Default Value

""

Remarks

The issuer of the certificate. This property contains a string representation of the name of the issuing authority for the certificate.

This property is read-only.

Data Type

String

SSHCertPrivateKey Property (SSHReverseTunnel Control)

The private key of the certificate (if available).

Syntax

sshreversetunnelcontrol.SSHCertPrivateKey

Default Value

""

Remarks

The private key of the certificate (if available). The key is provided as PEM/Base64-encoded data.

Note: The SSHCertPrivateKey may be available but not exportable. In this case, SSHCertPrivateKey returns an empty string.

This property is read-only.

Data Type

String

SSHCertPrivateKeyAvailable Property (SSHReverseTunnel Control)

Whether a PrivateKey is available for the selected certificate.

Syntax

sshreversetunnelcontrol.SSHCertPrivateKeyAvailable

Default Value

False

Remarks

Whether a SSHCertPrivateKey is available for the selected certificate. If SSHCertPrivateKeyAvailable is True, the certificate may be used for authentication purposes (e.g., server authentication).

This property is read-only.

Data Type

Boolean

SSHCertPrivateKeyContainer Property (SSHReverseTunnel Control)

The name of the PrivateKey container for the certificate (if available).

Syntax

sshreversetunnelcontrol.SSHCertPrivateKeyContainer

Default Value

""

Remarks

The name of the SSHCertPrivateKey container for the certificate (if available). This functionality is available only on Windows platforms.

This property is read-only.

Data Type

String

SSHCertPublicKey Property (SSHReverseTunnel Control)

The public key of the certificate.

Syntax

sshreversetunnelcontrol.SSHCertPublicKey

Default Value

""

Remarks

The public key of the certificate. The key is provided as PEM/Base64-encoded data.

This property is read-only.

Data Type

String

SSHCertPublicKeyAlgorithm Property (SSHReverseTunnel Control)

The textual description of the certificate's public key algorithm.

Syntax

sshreversetunnelcontrol.SSHCertPublicKeyAlgorithm

Default Value

""

Remarks

The textual description of the certificate's public key algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_DH") or an object identifier (OID) string representing the algorithm.

This property is read-only.

Data Type

String

SSHCertPublicKeyLength Property (SSHReverseTunnel Control)

The length of the certificate's public key (in bits).

Syntax

sshreversetunnelcontrol.SSHCertPublicKeyLength

Default Value

0

Remarks

The length of the certificate's public key (in bits). Common values are 512, 1024, and 2048.

This property is read-only.

Data Type

Integer

SSHCertSerialNumber Property (SSHReverseTunnel Control)

The serial number of the certificate encoded as a string.

Syntax

sshreversetunnelcontrol.SSHCertSerialNumber

Default Value

""

Remarks

The serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, with each pair representing a byte of the serial number.

This property is read-only.

Data Type

String

SSHCertSignatureAlgorithm Property (SSHReverseTunnel Control)

The text description of the certificate's signature algorithm.

Syntax

sshreversetunnelcontrol.SSHCertSignatureAlgorithm

Default Value

""

Remarks

The text description of the certificate's signature algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_MD5RSA") or an object identifier (OID) string representing the algorithm.

This property is read-only.

Data Type

String

SSHCertStore Property (SSHReverseTunnel Control)

The name of the certificate store for the client certificate.

Syntax

sshreversetunnelcontrol.SSHCertStore[=string]

Default Value

"MY"

Remarks

The name of the certificate store for the client certificate.

The SSHCertStoreType property denotes the type of the certificate store specified by SSHCertStore. If the store is password-protected, specify the password in SSHCertStorePassword.

SSHCertStore is used in conjunction with the SSHCertSubject property to specify client certificates. If SSHCertStore has a value, and SSHCertSubject or SSHCertEncoded is set, a search for a certificate is initiated. Please see the SSHCertSubject property for details.

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).

To read or write binary data to the property, a Variant (Byte Array) version is provided in .SSHCertStoreB.

Data Type

Binary String

SSHCertStorePassword Property (SSHReverseTunnel Control)

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

Syntax

sshreversetunnelcontrol.SSHCertStorePassword[=string]

Default Value

""

Remarks

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

Data Type

String

SSHCertStoreType Property (SSHReverseTunnel Control)

The type of certificate store for this certificate.

Syntax

sshreversetunnelcontrol.SSHCertStoreType[=integer]

Possible Values

cstUser(0), 
cstMachine(1), 
cstPFXFile(2), 
cstPFXBlob(3), 
cstJKSFile(4), 
cstJKSBlob(5), 
cstPEMKeyFile(6), 
cstPEMKeyBlob(7), 
cstPublicKeyFile(8), 
cstPublicKeyBlob(9), 
cstSSHPublicKeyBlob(10), 
cstP7BFile(11), 
cstP7BBlob(12), 
cstSSHPublicKeyFile(13), 
cstPPKFile(14), 
cstPPKBlob(15), 
cstXMLFile(16), 
cstXMLBlob(17), 
cstJWKFile(18), 
cstJWKBlob(19), 
cstSecurityKey(20), 
cstBCFKSFile(21), 
cstBCFKSBlob(22), 
cstPKCS11(23), 
cstAuto(99)

Default Value

0

Remarks

The type of certificate store for this certificate.

The control supports both public and private keys in a variety of formats. When the cstAuto value is used, the control will automatically determine the type. This property can take one of the following values:

Data Type

Integer

SSHCertSubjectAltNames Property (SSHReverseTunnel Control)

Comma-separated lists of alternative subject names for the certificate.

Syntax

sshreversetunnelcontrol.SSHCertSubjectAltNames

Default Value

""

Remarks

Comma-separated lists of alternative subject names for the certificate.

This property is read-only.

Data Type

String

SSHCertThumbprintMD5 Property (SSHReverseTunnel Control)

The MD5 hash of the certificate.

Syntax

sshreversetunnelcontrol.SSHCertThumbprintMD5

Default Value

""

Remarks

The MD5 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

This property is read-only.

Data Type

String

SSHCertThumbprintSHA1 Property (SSHReverseTunnel Control)

The SHA-1 hash of the certificate.

Syntax

sshreversetunnelcontrol.SSHCertThumbprintSHA1

Default Value

""

Remarks

The SHA-1 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

This property is read-only.

Data Type

String

SSHCertThumbprintSHA256 Property (SSHReverseTunnel Control)

The SHA-256 hash of the certificate.

Syntax

sshreversetunnelcontrol.SSHCertThumbprintSHA256

Default Value

""

Remarks

The SHA-256 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

This property is read-only.

Data Type

String

SSHCertUsage Property (SSHReverseTunnel Control)

The text description of UsageFlags .

Syntax

sshreversetunnelcontrol.SSHCertUsage

Default Value

""

Remarks

The text description of SSHCertUsageFlags.

This value will be one or more of the following strings and will be separated by commas:

• Digital Signature
• Non-Repudiation
• Key Encipherment
• Data Encipherment
• Key Agreement
• Certificate Signing
• CRL Signing
• Encipher Only

If the provider is OpenSSL, the value is a comma-separated list of X.509 certificate extension names.

This property is read-only.

Data Type

String

SSHCertUsageFlags Property (SSHReverseTunnel Control)

The flags that show intended use for the certificate.

Syntax

sshreversetunnelcontrol.SSHCertUsageFlags

Default Value

0

Remarks

The flags that show intended use for the certificate. The value of SSHCertUsageFlags is a combination of the following flags:

Please see the SSHCertUsage property for a text representation of SSHCertUsageFlags.

This functionality currently is not available when the provider is OpenSSL.

This property is read-only.

Data Type

Integer

SSHCertVersion Property (SSHReverseTunnel Control)

The certificate's version number.

Syntax

sshreversetunnelcontrol.SSHCertVersion

Default Value

""

Remarks

The certificate's version number. The possible values are the strings "V1", "V2", and "V3".

This property is read-only.

Data Type

String

SSHCertSubject Property (SSHReverseTunnel Control)

The subject of the certificate used for client authentication.

Syntax

sshreversetunnelcontrol.SSHCertSubject[=string]

Default Value

""

Remarks

The subject of the certificate used for client authentication.

This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject.

If a matching certificate is found, the property is set to the full subject of the matching certificate.

If an exact match is not found, the store is searched for subjects containing the value of the property.

If a match is still not found, the property is set to an empty string, and no certificate is selected.

The special value "*" picks a random certificate in the certificate 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.

Data Type

String

SSHCertEncoded Property (SSHReverseTunnel Control)

The certificate (PEM/Base64 encoded).

Syntax

sshreversetunnelcontrol.SSHCertEncoded[=string]

Default Value

""

Remarks

The certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The SSHCertStore and SSHCertSubject properties also may be used to specify a certificate.

When SSHCertEncoded is set, a search is initiated in the current SSHCertStore for the private key of the certificate. If the key is found, SSHCertSubject is updated to reflect the full subject of the selected certificate; otherwise, SSHCertSubject is set to an empty string.

To read or write binary data to the property, a Variant (Byte Array) version is provided in .SSHCertEncodedB.

This property is not available at design time.

Data Type

Binary String

SSHCompressionAlgorithms Property (SSHReverseTunnel Control)

The comma-separated list containing all allowable compression algorithms.

Syntax

sshreversetunnelcontrol.SSHCompressionAlgorithms[=string]

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 control 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 control:

• zlib
• zlib@openssh.com
• none

Data Type

String

SSHEncryptionAlgorithms Property (SSHReverseTunnel Control)

The comma-separated list containing all allowable encryption algorithms.

Syntax

sshreversetunnelcontrol.SSHEncryptionAlgorithms[=string]

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 control 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 control:

Data Type

String

SSHHost Property (SSHReverseTunnel Control)

The address of the Secure Shell (SSH) host.

Syntax

sshreversetunnelcontrol.SSHHost[=string]

Default Value

""

Remarks

The SSHHost property specifies the IP address (IP number in dotted internet format) or domain name of the remote host. It is set before a connection is attempted and cannot be changed once a connection is established.

If the SSHHost property is set to a domain name, a DNS request is initiated, and upon successful termination of the request, the SSHHost property is set to the corresponding address. If the search is not successful, an error is returned.

The SSHHost must be the same host that will be assumed for SSH as for the remote service being connected to.

Data Type

String

SSHPassword Property (SSHReverseTunnel Control)

The password for Secure Shell (SSH) password-based authentication.

Syntax

sshreversetunnelcontrol.SSHPassword[=string]

Default Value

""

Remarks

SSHPassword specifies the password that is used to authenticate the client to the SSH server.

Data Type

String

SSHPort Property (SSHReverseTunnel Control)

The port on the Secure Shell (SSH) server where the SSH service is running; by default, 22.

Syntax

sshreversetunnelcontrol.SSHPort[=integer]

Default Value

22

Remarks

The SSHPort specifies a service port on the SSH host to connect to.

A valid port number (a value between 1 and 65535) is required for the connection to take place. The property must be set before a connection is attempted and cannot be changed once a connection is established. Any attempt to change this property while connected will fail with an error.

Data Type

Integer

SSHUser Property (SSHReverseTunnel Control)

The username for Secure Shell (SSH) authentication.

Syntax

sshreversetunnelcontrol.SSHUser[=string]

Default Value

""

Remarks

SSHUser specifies the username that is used to authenticate the client to the SSH server. This property is required.

Example 1. User/Password Authentication: Control.SSHAuthMode = SftpSSHAuthModes.amPassword Control.SSHUser = "username" Control.SSHPassword = "password" Control.SSHLogon("server", 22) Example 2. Public Key Authentication: Control.SSHAuthMode = SftpSSHAuthModes.amPublicKey Control.SSHUser = "username" Control.SSHCertStoreType = SSHCertStoreTypes.cstPFXFile; Control.SSHCertStore = "cert.pfx"; Control.SSHCertStorePassword = "certpassword"; Control.SSHCertSubject = "*"; Control.SSHLogon("server", 22)

Data Type

String

Timeout Property (SSHReverseTunnel Control)

This property includes the timeout for the control.

Syntax

sshreversetunnelcontrol.Timeout[=integer]

Default Value

60

Remarks

If the Timeout property is set to 0, all operations return immediately, potentially failing with a WOULDBLOCK error if data cannot be sent immediately.

If Timeout is set to a positive value, data is sent in a blocking manner and the control will wait for the operation to complete before returning control. The control will handle any potential WOULDBLOCK errors internally and automatically retry the operation for a maximum of Timeout seconds.

The control will use DoEvents to enter an efficient wait loop during any potential waiting period, making sure that all system events are processed immediately as they arrive. This ensures that the host application does not freeze and remains responsive.

If Timeout expires, and the operation is not yet complete, the control fails with an error.

Note: By default, all timeouts are inactivity timeouts, that is, the timeout period is extended by Timeout seconds when any amount of data is successfully sent or received.

The default value for the Timeout property is 60 seconds.

Data Type

Integer

CancelForwarding Method (SSHReverseTunnel Control)

Requests the server to stop forwarding a remote Transmission Control Protocol (TCP)/IP port.

Syntax

sshreversetunnelcontrol.CancelForwarding Address, Port

Remarks

The CancelForwarding cancels a previous TCP/IP port forwarding request. When calling it, provide the same argument values you provided on the RequestForwarding call.

CloseChannel Method (SSHReverseTunnel Control)

Closes a existing SSHChannel .

Syntax

sshreversetunnelcontrol.CloseChannel ChannelId

Remarks

ChannelId is the identifier for the Secure Shell (SSH) channel to be closed.

Config Method (SSHReverseTunnel Control)

Sets or retrieves a configuration setting.

Syntax

sshreversetunnelcontrol.Config ConfigurationString

Remarks

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

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

DecodePacket Method (SSHReverseTunnel Control)

Decodes a hex-encoded Secure Shell (SSH) packet.

Syntax

sshreversetunnelcontrol.DecodePacket EncodedPacket

Remarks

This method is used to decode an SSH packet created by EncodePacket.

Note: This method is applicable only for reading and creating Secure Shell (SSH) packets for use within the SSHCustomAuth event.

DoEvents Method (SSHReverseTunnel Control)

This method processes events from the internal message queue.

Syntax

sshreversetunnelcontrol.DoEvents 

Remarks

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

EncodePacket Method (SSHReverseTunnel Control)

Hex encodes a Secure Shell (SSH) packet.

Syntax

sshreversetunnelcontrol.EncodePacket Packet

Remarks

This method is used to encode a raw SSH packet created by SetSSHParam.

Note: This method is applicable only for reading and creating Secure Shell (SSH) packets for use within the SSHCustomAuth event.

ExchangeKeys Method (SSHReverseTunnel Control)

Causes the control to exchange a new set of session keys with the SSHHost .

Syntax

sshreversetunnelcontrol.ExchangeKeys 

Remarks

Secure Shell (SSH) key renegotiation can be initiated by either end of an established SSH connection. ExchangeKeys allows the user to start such a renegotiation with the SSHHost. 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. Doing so makes it more difficult to break the security of data-intensive or long-lived connections.

GetSSHParam Method (SSHReverseTunnel Control)

Reads a field from a Secure Shell (SSH) packet's payload.

Syntax

sshreversetunnelcontrol.GetSSHParam Payload, Field

Remarks

This method is used to read the value of a particular field from an SSH packet's payload. Payload should contain the full payload of a packet received by an event such as SSHChannelRequest. Field is the name of a field to be read out of the packet.

The following is a list of the names of well-known channel request field names and their encodings:

The remaining fields that are available in the payload are dependent on the value of RequestType.

pty-req

Pty-req is a request to open a pseudo terminal on the specified channel. The following fields are available:

x11-req

X11-req is a request to forward x11 sessions over a channel. The following fields are available:

env

Env is a request to set an environment variable to be passed into a shell that may be started later. The following fields are available:

exec

Exec is a request to execute a command on the channel using the authenticated user's shell. The following field is available:

subsystem

Subsystem is a request to start a subsystem on the specified channel. The following field is available:

xon-xoff

Xon-xoff instructs the server to allow or disallow control-S/control-Q style flow control. The following field is available:

signal

Sends a signal to the remote process/service. The following field is available:

If the packet type is not well known, Field should start with the special character "%" and contain a comma-separated list of field types as defined in SetSSHParam. For example, reading out the X11AuthProtocol of an x11-req payload, you can use "%s,f".

Note: The return value is a string encoded the same way as the FieldValue param in SetSSHParam.

Note: This method is applicable only for reading and creating Secure Shell (SSH) packets for use within the SSHCustomAuth event.

GetSSHParamBytes Method (SSHReverseTunnel Control)

Reads a field from a Secure Shell (SSH) packet's payload.

Syntax

sshreversetunnelcontrol.GetSSHParamBytes Payload, Field

Remarks

This method is the same as calling GetSSHParam, but it returns raw bytes instead of strings.

Note: This method is applicable only for reading and creating Secure Shell (SSH) packets for use within the SSHCustomAuth event.

RequestForwarding Method (SSHReverseTunnel Control)

Requests the server to forward a remote Transmission Control Protocol (TCP)/IP port.

Syntax

sshreversetunnelcontrol.RequestForwarding Address, Port, ForwardingHost, ForwardingPort

Remarks

The RequestForwarding method asks the server to listen at the specified TCP/IP Address and Port for connection requests and then forward them as new Secure Shell (SSH) channels to the control.

ForwardingHost and ForwardingPort may be used to specify an address and port to which traffic will automatically be forwarded. If automatic forwarding is not desired, specify an empty string ("") for the ForwardingHost parameter.

The Address argument can be specified in different ways:

• "" means that connections are to be accepted on all protocol families supported by the server.
• "0.0.0.0" means to listen on all IPv4 addresses.
• "::" means to listen on all IPv6 addresses.
• "localhost" means to listen on all protocol families supported by the Secure Shell (SSH) implementation on loopback addresses only.
• "127.0.0.1" and "::1" indicate listening on the loopback interfaces for IPv4 and IPv6, respectively.

Passing a value of 0 for the Port parameter instructs the server to assign a port. In this case, query the ForwardedPort setting to determine the port that was assigned by the server.

The control has two modes that allow data to be dealt with directly from the events, or automatically forwarded on to a different endpoint.

Event Based Operation

In this mode, any data received by the control over the tunnel causes the events of the control to fire. For instance:

SSHReverseTunnel.RequestForwarding("0.0.0.0", 777, "", 0);

In the above code, forwarding is requested from port 777 on the SSHHost. Any data received on port 777 by the SSHHost will be sent to the control. In the above code, the last two parameters are empty and 0, indicating to the control that no local forwarding is requested.

Once RequestForwarding returns, the Secure Shell (SSH) reverse tunnel is established. Any connection made to the SSH host on the specified port will then trigger the control's events to fire, allowing you to handle the connection request and data.

When a client connects to the SSH host on the specified port, the SSHChannelOpenRequest event will fire. Within this event, choose to accept or reject the connection by setting the Accept parameter. This event contains details about the connection that may be used when determining whether to accept the connection.

After the channel is established, data are received through the SSHChannelData event. Call the SendChannelData method to send data over the channel, and call the CloseChannel method to close the channel.

Local Forwarding

In this mode, any data received by the control is automatically forwarded to a separate endpoint. This allows the control to act as a sort of proxy. There is no need to handle data directly in this case. For instance: SSHReverseTunnel.RequestForwarding("0.0.0.0", 777, "nsoftware.com", 80);

In the above code, forwarding is requested from port 777 on SSHHost. The control is instructed to establish a connection to "nsoftware.com" on port 80 when a client connects to SSHHost on port 777. Any data received from the client connected to SSHHost on port 777 will automatically be forwarded to "nsoftware.com" on port 80. Any data received back from "nsoftware.com" on port 80 will be sent back to the connected client.

In this mode, data may flow freely from the client connected to the SSHHost to the endpoint specified in the RequestForwarding method without any additional code required.

Reset Method (SSHReverseTunnel Control)

This method will reset the control.

Syntax

sshreversetunnelcontrol.Reset 

Remarks

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

SendChannelData Method (SSHReverseTunnel Control)

Sends data over a Secure Shell (SSH) channel.

Syntax

sshreversetunnelcontrol.SendChannelData ChannelId, Data

Remarks

This method can be used to send arbitrary data to the channel with the specified ChannelId.

SetSSHParam Method (SSHReverseTunnel Control)

Writes a field to the end of a payload.

Syntax

sshreversetunnelcontrol.SetSSHParam Payload, FieldType, FieldValue

Remarks

This method is used to build the payload portion of a Secure Shell (SSH) packet to be sent later by a call to SendSSHPacket. Payload should contain the result of a previous call to SetSSHParam. FieldType is a string defining the type of field to be written to the packet. FieldValue should be the string representation of the field to be written.

The following is a list of supported field types and a description of how FieldValue should be encoded:

Note: Integer values may be hexadecimal encoded by prefixing "0x" to the beginning of the string; otherwise, the value is assumed to be Base10.

Note: This method is applicable only for reading and creating Secure Shell (SSH) packets for use within the SSHCustomAuth event.

SSHLogoff Method (SSHReverseTunnel Control)

Logs off from the Secure Shell (SSH) server.

Syntax

sshreversetunnelcontrol.SSHLogoff 

Remarks

Logs off from the SSH server. If that fails, the connection is terminated by the local host.

SSHLogon Method (SSHReverseTunnel Control)

Logs on to the SSHHost using the current SSHUser and SSHPassword .

Syntax

sshreversetunnelcontrol.SSHLogon SSHHost, SSHPort

Remarks

Logs on to the Secure Shell (SSH) server using the current SSHUser and SSHPassword. This will perform the SSH handshake and authentication.

Example. Logging On:

SSHClient.SSHUser = "username" SSHClient.SSHPassword = "password" SSHClient.SSHLogon("sshHost", sshPort)

Connected Event (SSHReverseTunnel Control)

Fired immediately after a connection completes (or fails).

Syntax

Sub sshreversetunnelcontrol_Connected(StatusCode As Integer, Description As String)

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 Transmission Control Protocol (TCP)/IP stack. Description contains a description of this code. The value of StatusCode is equal to the value of the error. The corresponding Visual Basic error code can be obtained by adding 15001 to this value.

Please refer to the Error Codes section for more information.

ConnectionStatus Event (SSHReverseTunnel Control)

Fired to indicate changes in the connection state.

Syntax

Sub sshreversetunnelcontrol_ConnectionStatus(ConnectionEvent As String, StatusCode As Integer, Description As String)

Remarks

This event is fired when the connection state changes: for example, completion of a firewall or proxy connection or completion of a security handshake.

The ConnectionEvent parameter indicates the type of connection event. Values may include the following:

Disconnected Event (SSHReverseTunnel Control)

Fired when a connection is closed.

Syntax

Sub sshreversetunnelcontrol_Disconnected(StatusCode As Integer, Description As String)

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 Transmission Control Protocol (TCP/IP) subsystem. Description contains a description of this code. The value of StatusCode is equal to the value of the TCP/IP error. The corresponding Visual Basic error code can be obtained by adding 15001 to this value.

Please refer to the Error Codes section for more information.

Error Event (SSHReverseTunnel Control)

Fired when information is available about errors during data delivery.

Syntax

Sub sshreversetunnelcontrol_Error(ErrorCode As Integer, Description As String)

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the control fails with an error.

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

The Error event is fired in case of exceptional conditions during message processing. Normally the control fails with an error.

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

Log Event (SSHReverseTunnel Control)

Fired once for each log message.

Syntax

Sub sshreversetunnelcontrol_Log(LogLevel As Integer, Message As String, LogType As String)

Remarks

Fired once for each log message generated by the control. 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.

ReconnectAttempt Event (SSHReverseTunnel Control)

Fired when attempting to reconnect.

Syntax

Sub sshreversetunnelcontrol_ReconnectAttempt(Host As String, Port As Integer, RetryCount As Integer, RetriesRemaining As Integer, MaxRetryCount As Integer, RetryInterval As Integer, RetryType As Integer, RemoteListeningPort As Integer, Cancel As Boolean)

Remarks

This event fires both when attempting to reconnect to the SSHHost and when reestablishing a Secure Shell (SSH) tunnel.

This is applicable only when AutoReconnect is enabled. To determine which type of connection is being established check the RetryType parameter.

The following table provides details about the parameters:

SSHChannelClosed Event (SSHReverseTunnel Control)

Fired when a channel is closed.

Syntax

Sub sshreversetunnelcontrol_SSHChannelClosed(ChannelId As String)

Remarks

The SSHChannelClosed event is fired when a channel is closed on a Secure Shell (SSH) connection.

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.

SSHChannelData Event (SSHReverseTunnel Control)

Fired when the SSHHost sends channel data to the client.

Syntax

Sub sshreversetunnelcontrol_SSHChannelData(ChannelId As String, ChannelData As String, ChannelDataEOLFound As Boolean)

Remarks

The SSHChannelData event will fire as data are received for the given ChannelId. ChannelData will contain the decrypted contents of the Secure Shell (SSH) packet.

ChannelDataEOLFound indicates whether or not the ChannelEOL string for the channel was found at the end of ChannelData. If the ChannelEOL string was found, then ChannelDataEOLFound is True.

If ChannelData is part of a data portion of a length that is larger than the MaxChannelLength for the Channel with no ChannelEOL strings in it, then ChannelDataEOLFound is False.

Note: This means that one of more SSHChannelData events with ChannelDataEOLFound set to False can be received.

If the ChannelEOL property for the Channel is "" (empty string), then ChannelDataEOLFound can be disregarded (it is always True).

SSHChannelEOF Event (SSHReverseTunnel Control)

Fired when the remote peer signals the end of the data stream for the channel.

Syntax

Sub sshreversetunnelcontrol_SSHChannelEOF(ChannelId As String)

Remarks

The SSHChannelEOF event is fired when the end of the data stream for a channel on a Secure Shell (SSH) connection is reached.

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.

SSHChannelOpened Event (SSHReverseTunnel Control)

Fired when a channel is successfully opened.

Syntax

Sub sshreversetunnelcontrol_SSHChannelOpened(ChannelId As String)

Remarks

The SSHChannelOpened event is fired when a channel is successfully opened on a Secure Shell (SSH) connection.

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.

SSHChannelOpenRequest Event (SSHReverseTunnel Control)

Fired when the peer attempts to open a new channel.

Syntax

Sub sshreversetunnelcontrol_SSHChannelOpenRequest(ChannelId As String, Service As String, ConnectedAddress As String, ConnectedPort As Integer, OriginAddress As String, OriginPort As Integer, Accept As Boolean)

Remarks

This event is fired whenever a peer attempts to open a new channel for a given connection. ChannelId will contain the Id of the channel to be created. Service will identify the type of channel that is being requested. Usually, this will be "forwarded-tcpip", in which case ConnectedAddress and ConnectedPort will contain the remote Transmission Control Protocol (TCP)/IP address and port on the peer to which the connection was established; OriginAddress and OriginPort contain the originating TCP/IP address and port of the connection.

By default, Accept is True and the channel will be opened. Set Accept to False to reject the request.

SSHChannelReadyToSend Event (SSHReverseTunnel Control)

Fired when the control is ready to send data.

Syntax

Sub sshreversetunnelcontrol_SSHChannelReadyToSend(ChannelId As String)

Remarks

This event fires when data can be sent over the Secure Shell (SSH) Channel specified by ChannelId.

When a channel is opened, this event will fire after the channel is ready and data can be sent.

When Timeout is set to 0 (asynchronous) sending data may result in an error if the channel or underlying socket cannot accept more data to send. Monitor SSHChannelReadyToSend or ReadyToSend to determine when data can be sent again.

When Timeout is set to a positive value, the control will block when sending data until the data can be successfully sent and SSHChannelReadyToSend and ReadyToSend do not need to be monitored.

SSHChannelRequest Event (SSHReverseTunnel Control)

Fired when the SSHHost sends a channel request to the client.

Syntax

Sub sshreversetunnelcontrol_SSHChannelRequest(ChannelId As String, RequestType As String, Packet As String, Success As Boolean)

Remarks

The SSHHost may send requests that affect the status of a particular SSHChannel. Some requests will be automatically handled by the control. Others, however, may need the attention of the user to be dealt with properly within the scope of the application.

ChannelId identifies the channel receiving the request.

Type will contain the type of the request. These types depend on the type of the channel. For example, a "session" channel executing a command on the remote shell may receive an "exit-status" request containing the return code of that command.

RequestData contains the remainder of the original Secure Shell (SSH) packet. If the request type has specific parameters, they can be parsed out of this data.

Success should be used to instruct the control to respond to the request with either a success or failure notification. If the request is successful, SSHChannelRequested will fire with the same information in case the request requires further processing.

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.

SSHChannelRequested Event (SSHReverseTunnel Control)

Fired if the SSHChannelRequest was successful; any further processing for the channel request should be done here.

Syntax

Sub sshreversetunnelcontrol_SSHChannelRequested(ChannelId As String, RequestType As String, Packet As String)

Remarks

The SSHHost may send requests that affect the status of a particular SSHChannel. Some requests will be automatically handled by the control. Others, however, may need the attention of the user to be dealt with properly within the scope of the application.

ChannelId identifies the channel receiving the request.

Type will contain the type of the request. These types depend on the type of the channel. For example, a "session" channel executing a command on the remote shell may receive an "exit-status" request containing the return code of that command.

RequestData contains the remainder of the original Secure Shell (SSH) packet. If the request type has specific parameters, they can be parsed out of this data.

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.

SSHCustomAuth Event (SSHReverseTunnel Control)

Fired when the control is doing a custom authentication.

Syntax

Sub sshreversetunnelcontrol_SSHCustomAuth(Packet As String)

Remarks

SSHCustomAuth is fired during the user authentication stage of the Secure Shell (SSH) logon process if SSHAuthMode is set to amCustom. Packet contains the last raw SSH packet sent by the server, in HEX-encoded format.

The client should create a new raw SSH packet to send to the server and set Packet to the HEX-encoded representation of the packet to send.

In all cases, Packet will start with the message type field.

To read the incoming packet, call DecodePacket and then use the GetSSHParam and GetSSHParamBytes methods. To create a packet, use the SetSSHParam method and then call EncodePacket to obtain a HEX-encoded value and assign this to the Packet parameter.

SSHKeyboardInteractive Event (SSHReverseTunnel Control)

Fired when the control receives a request for user input from the server.

Syntax

Sub sshreversetunnelcontrol_SSHKeyboardInteractive(Name As String, Instructions As String, Prompt As String, Response As String, EchoResponse As Boolean)

Remarks

SSHKeyboardInteractive is fired during the user authentication stage of the Secure Shell (SSH) logon process. During authentication, the control will request a list of available authentication methods for the SSHUser. For example, if the SSHHost responds with "keyboard-interactive", the control will fire this event to allow the client application to set the password.

During authentication, the SSH server may respond with a request for the user's authentication information. Name is a server-provided value associated with the authentication method such as "CRYPTOCard Authentication". Instructions will contain specific instructions, also supplied by the server, for how the user should respond.

Along with these values, the server will also send at least one input Prompt to be displayed to and filled out by the user. Response should be set to the user's input, and will be sent back in the user authentication information response. EchoResponse is a server recommendation for whether or not the user's response should be echoed back during input.

Note: The server may send several prompts in a single packet. The control will fire the SSHKeyboardInteractive event once for each prompt.

SSHServerAuthentication Event (SSHReverseTunnel Control)

Fired after the server presents its public key to the client.

Syntax

Sub sshreversetunnelcontrol_SSHServerAuthentication(HostKey As String, Fingerprint As String, KeyAlgorithm As String, CertSubject As String, CertIssuer As String, Status As String, Accept As Boolean)

Remarks

This event is fired when the client can decide whether or not to continue with the connection process. If the public key is known to be a valid key for the Secure Shell (SSH) server, Accept should be set to True within the event. Otherwise, the server will not be authenticated and the connection will be broken.

Accept will be True only if either HostKey or Fingerprint is identical to the value of SSHAcceptServerHostKey.

Accept may be set to True manually to accept the server host key.

Note: SSH's security inherently relies on client verification of the host key. Ignoring the host key and always setting Accept to True is strongly discouraged, and could cause potentially serious security vulnerabilities in your application. It is recommended that clients maintain a list of known keys for each server and check HostKey against this list each time a connection is attempted.

Host Key contains the full binary text of the key, in the same format used internally by SSH.

Fingerprint holds the SHA-256 hash of HostKey in the hex-encoded form: 0a:1b:2c:3d. To configure the hash algorithm used to calculate this value, see SSHFingerprintHashAlgorithm.

KeyAlgorithm identifies the host key algorithm. The following values are supported:

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

CertSubject is the subject of the certificate. This is applicable only when KeyAlgorithm is "x509v3-sign-rsa" or "x509v3-sign-dss".

CertIssuer is the issuer of the certificate. This is applicable only when KeyAlgorithm is "x509v3-sign-rsa" or "x509v3-sign-dss".

Status is reserved for future use.

SSHStatus Event (SSHReverseTunnel Control)

Fired to track the progress of the secure connection.

Syntax

Sub sshreversetunnelcontrol_SSHStatus(Message As String)

Remarks

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

Config Settings (SSHReverseTunnel Control)

SSHReverseTunnel Config Settings

SSHClient Config Settings

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

TCPClient Config Settings

Socket Config Settings

Base Config Settings

Trappable Errors (SSHReverseTunnel Control)

SSHReverseTunnel Errors

SSHClient Errors

The control may also return one of the following error codes, which are inherited from other controls.

TCPClient Errors

TCP/IP Errors