C

SSH Keyboard Authentication

See more SSH Examples

Demonstrates how to implement keyboard authentication with an SSH server. C

#include <C_CkSsh.h>
#include <C_CkXml.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSsh ssh;
    const char *hostname;
    int port;
    const char *xmlResponse;
    HCkXml xml;

    success = FALSE;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    ssh = CkSsh_Create();

    // Set some timeouts, in milliseconds:
    CkSsh_putConnectTimeoutMs(ssh,5000);
    CkSsh_putIdleTimeoutMs(ssh,15000);

    // Connect to the SSH server.  
    // The standard SSH port = 22
    // The hostname may be a hostname or IP address.
    hostname = "sftp.example.com";
    port = 22;
    success = CkSsh_Connect(ssh,hostname,port);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Begin keyboard authentication..
    xmlResponse = CkSsh_startKeyboardAuth(ssh,"myLogin");
    if (CkSsh_getLastMethodSuccess(ssh) != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // If a user authentication banner was received, then your app
    // may display it prior to prompting for the password.
    printf("UserAuthBanner: %s\n",CkSsh_userAuthBanner(ssh));

    xml = CkXml_Create();

    success = CkXml_LoadXml(xml,xmlResponse);
    // Assume LoadXml succeeds for the example..
    if (CkXml_HasChildWithTag(xml,"success") == TRUE) {
        printf("No password required, already authenticated.\n");
        CkSsh_Dispose(ssh);
        CkXml_Dispose(xml);
        return;
    }

    if (CkXml_HasChildWithTag(xml,"error") == TRUE) {
        printf("Authentication already failed.\n");
        CkSsh_Dispose(ssh);
        CkXml_Dispose(xml);
        return;
    }

    // See the online reference documentation for Chilkat SSH.
    // The XML returned by StartKeyboardAuth will contain an infoRequest
    // with one or more prompts that your application may choose to display.

    // Call ContinueKeyboardAuth, passing in the whatever information is requires (such as the password).
    // Typically, keyboard authentication requires one call to ContinueKeyboardAuth 
    // using the password.  Theoretically, the SSH server could prompt for additional pieces
    // of information.  The authentication is completed when the XML returned contains
    // either a "success" or "error" child node.

    // This example asumes only one call to ContinueKeyboardAuth is required.
    xmlResponse = CkSsh_continueKeyboardAuth(ssh,"myPassword");
    if (CkSsh_getLastMethodSuccess(ssh) != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        CkXml_Dispose(xml);
        return;
    }

    success = CkXml_LoadXml(xml,xmlResponse);
    // Assume LoadXml succeeds for the example..
    if (CkXml_HasChildWithTag(xml,"success") == TRUE) {
        printf("SSH Keyboard Authentication Successful!\n");
        CkSsh_Dispose(ssh);
        CkXml_Dispose(xml);
        return;
    }

    if (CkXml_HasChildWithTag(xml,"error") == TRUE) {
        printf("Authentication failed.\n");
        CkSsh_Dispose(ssh);
        CkXml_Dispose(xml);
        return;
    }



    CkSsh_Dispose(ssh);
    CkXml_Dispose(xml);

    }