Zig

Authenticate an IMAP SSH Tunnel with a Password

Demonstrates the Chilkat Imap.SshAuthenticatePw method, which authenticates the SSH tunnel using a username and password. The first argument is the SSH login name and the second is the SSH password. Call SshOpenTunnel first; after SSH authentication succeeds, connect and log in to IMAP.

Background: This is SSH authentication, which is entirely separate from the IMAP login that follows — the SSH credentials belong to the tunnel/jump host, while the IMAP credentials belong to the mail account. Password authentication is the simplest option; use SshAuthenticatePk for key-based authentication, which is generally preferred for automated jobs.

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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 Imap.SshAuthenticatePw method, which authenticates the SSH tunnel with a
    // username and password.  The 1st argument is the SSH login name and the 2nd is the SSH
    // password.  Call SshOpenTunnel first.

    const imap = try chilkat.Imap.init();
    defer imap.deinit();

    // Open the SSH tunnel first.
    const ssh_port = 22;
    imap.sshOpenTunnel("ssh.example.com", ssh_port) catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    // The SSH password is not hard-coded in source.  Insert code here to obtain it from an
    // interactive prompt, environment variable, or a secrets vault.
    const ssh_password: [:0]const u8 = "";

    // Authenticate the SSH tunnel (this is SSH authentication, separate from IMAP login).
    imap.sshAuthenticatePw("sshUser", ssh_password) catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    // With the SSH tunnel in place, connect and log in to the IMAP server as usual.  The IMAP
    // traffic flows through the tunnel automatically.
    imap.setSsl(true);
    imap.setPort(993);
    imap.connect("imap.example.com") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.login("user@example.com", "myPassword") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.disconnect() catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.sshCloseTunnel() catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };
}