Once the channel is obtained, the Socket API may - be used exactly the same as usual, except all communications - are sent through the channel in the SSH tunnel. PRINT = sp_OADestroy END - OK, the SSH tunnel is setup. EXEC sp_OAMethod 'SshAuthenticatePw', OUT, 'mySshLogin', 'mySshPassword' IF 1 This example demonstrates SSH password authentication. PRINT = sp_OADestroy END - Authenticate with the SSH server via a login/password - or with a public key. Connect to an SSH server and establish the SSH tunnel: DECLARE int EXEC sp_OAMethod 'SshOpenTunnel', OUT, 1īEGIN EXEC sp_OAGetProperty 'LastErrorText', OUT DECLARE int EXEC = sp_OACreate ' Chilkat_9_5_0.Socket', OUT IF 0 BEGIN PRINT 'Failed to create ActiveX component' RETURN END DECLARE nvarchar( 4000) See Global Unlock Sample for sample code. This example requires the Chilkat API to have been previously unlocked. Important: See this note about string length limitations for strings returned by sp_OAMethod calls.ĪS BEGIN DECLARE int DECLARE int DECLARE nvarchar( 4000) The intent of this example is to show how TCP communications can occur through an SSH tunnel. The most commonly used time protocol is the Network Time Protocol (RFC-1305). Note: This is not necessarily a recommended means for getting the current date/time. This example will connect to an NIST time server and (using the old Time Protocol (RFC 868)), will read the current GMT time. The directory where the encryption keys are stored.ĭRIVER=Devart ODBC Driver for SQL Server Data Source=myHost Initial Catalog=myDatabase Port=myPort User ID=myUsername Password=myPassword Use SSH=True SSH Host name=mySshHost SSH User Name=mySshUsername SSH Password=mySshPassword SSH Client Key=myPrivateClientKey.pem SSH Client Key Password=m圜lientKeyPassphrase SSH Server Key=myPublicServerKey.(SQL Server) TCP Socket through SSH Tunnel (Port Forwarding)ĭemonstrates using Chilkat Socket to communicate to a TCP service through an SSH tunnel. The filename of the SSH server public key. The passphrase for the client private key. The filename of the client private key for key-based authentication. The password for the account on the SSH server. The username for the account on the SSH server. The host name or IP address of the SSH server. To establish an SSH connection to SQL Server, specify the connection parameters on the SSH Options tab under Security Settings. Note: You don't have to install the SSH client since ODBC Driver for SQL Server implements the SSH client functionality. Below is a simplified diagram representing the SSH tunneling. The SSH server authenticates the client and enables the driver to establish a secure direct connection to SQL Server. The ODBC driver for SQL Server implements the SSH client feature to connect to the SSH server on the remote machine at the specified port. The server then authenticates the client and spawns the right environment. The client and server agree upon the encryption protocol and negotiate a session key. The SSH client begins the initial TCP handshake with the server and verifies the server's identity. The SSH server listens on default port 22 (this port can be changed) for incoming TCP connections. Assymetrical encryption is used during the initial key exchange process to produce the shared secret (session key) to encrypt messages for the duration of the session. The client public key must be stored in a location that is accessible by the SSH server to authenticate the server by the client conversely, the server public key must be placed on the client side to authenticate the client by the server. The public can key can be freely shared with anyone to autenticate another party, while the private key must be kept secret. The public key encrypts messages that can only be decrypted by the private key. Assymetric encryption requires two associated keys, the private key and the public key. In symmetric key cryptography, a single key is used by the sending and receiving parties to encrypt and decrypt messages. To secure the transmitted data, SSH employs forms of symmetric encryption, assymetric encryption, and hashing. The client and server authenticate each other and pass commands and output back and forth. SSH uses client-server architecture, connecting an SSH client with an SSH server. Secure Shell (SSH) is cryptographic network protocol for secure remote login, command execution and file transfer over untrusted networks. This section discusses how to connect to SQL Server through SSH.
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