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Start SFTP Keyboard-Interactive Authentication

Demonstrates the Chilkat SFtp.StartKeyboardAuth method, which begins keyboard-interactive authentication. The only argument is the login name. It returns XML describing the server's prompts, which are answered with ContinueKeyboardAuth.

Background: Keyboard-interactive is the prompt-driven authentication method: rather than assuming a single password, the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how SFTP supports two-factor and other challenge-response schemes. The returned XML tells you exactly what to ask and whether to mask the input.

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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Demonstrates the SFtp.StartKeyboardAuth method, which begins keyboard-interactive
    // authentication.  The only argument is the login name.  It returns XML describing the server's
    // prompts, which are answered with ContinueKeyboardAuth.

    const sftp = try chilkat.SFtp.init();
    defer sftp.deinit();

    // Step 1: Connect the SSH transport.  Port 22 is the usual port.
    const port = 22;
    sftp.connect("sftp.example.com", port) catch {
        std.debug.print("{s}\n", .{try sftp.getLastErrorText(alloc)});
        return;
    };

    // Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
    const info_request_xml = sftp.startKeyboardAuth(alloc, "mySshLogin") catch {
        std.debug.print("{s}\n", .{try sftp.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("{s}\n", .{info_request_xml});

    // Answer the prompt(s) with ContinueKeyboardAuth, then call InitializeSftp.

    sftp.disconnect();
}