Zig

(PKCS11) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

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Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request. Zig

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

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

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

    // Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

    const pkcs11 = try chilkat.Pkcs11.init();
    defer pkcs11.deinit();

    // Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
    // or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
    pkcs11.setSharedLibPath("C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll");

    pkcs11.initialize() catch {
        std.debug.print("{s}\n", .{try pkcs11.getLastErrorText(alloc)});
        return;
    };

    // Pass -1 for the slotID to open a session on the first non-empty slot.
    const slot_id = -1;

    // Open a session.
    const read_write = true;
    pkcs11.openSession(slot_id, read_write) catch {
        std.debug.print("{s}\n", .{try pkcs11.getLastErrorText(alloc)});
        return;
    };

    // Make it an authenticated session by calling Login.
    //
    // If we don't authenticate, then we won't be able to see the private keys, and thus
    // we won't know which certificates have an associated private key stored on the smart card.

    // The smart card PIN is passed to the Login method.
    // userType 1 indicates a "Normal User".
    const user_type = 1;
    const pin = "0000";
    pkcs11.login(user_type, pin) catch {
        std.debug.print("{s}\n", .{try pkcs11.getLastErrorText(alloc)});
        try pkcs11.closeSession();
        return;
    };

    const cert = try chilkat.Cert.init();
    defer cert.deinit();

    // Find a certificate by the Subject Common Name
    if (pkcs11.findCert("subjectCN", "BadSSL Client Certificate", cert)) {
        std.debug.print("Found: {s}\n", .{try cert.getSubjectCN(alloc)});
    } else |_| {
        std.debug.print("Not found: {s}\n", .{try cert.getSubjectCN(alloc)});
        try pkcs11.closeSession();
        return;
    }

    std.debug.print("Successfully loaded the cert object from the smart card / USB token.\n", .{});

    // Note: When successful, the cert object is internally linked to the Pkcs11 object's authenticated session.
    // The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.

    // ------------------------------------------------------------------------------------------------------------

    // Send an HTTPS request to https://client.badssl.com
    // https://client.badssl.com (part of the badssl.com service) lets you test authentication using client SSL certificates.
    // The client certificate can be downloaded from https://badssl.com/download/.
    // This server returns 200 OK if the correct client certificate is provided, and 400 Bad Request otherwise.

    const http = try chilkat.Http.init();
    defer http.deinit();

    // Provide the client certificate (linked internally to our authenticated smartcard session)
    http.setSslClientCert(cert) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        try pkcs11.closeSession();
        return;
    };

    const response_body = http.quickGetStr(alloc, "https://client.badssl.com/") catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        try pkcs11.closeSession();
        return;
    };

    std.debug.print("Response status code: {d}\n", .{http.getLastStatus()});
    std.debug.print("Response body: \n", .{});
    std.debug.print("{s}\n", .{response_body});

    // ------------------------------------------------------------------------------------------------------------
    // Revert to an unauthenticated session by calling Logout.
    pkcs11.logout() catch {
        std.debug.print("{s}\n", .{try pkcs11.getLastErrorText(alloc)});
        try pkcs11.closeSession();
        return;
    };

    // When finished, close the session.
    // It is important to close the session (memory leaks will occur if the session is not properly closed).
    pkcs11.closeSession() catch {
        std.debug.print("{s}\n", .{try pkcs11.getLastErrorText(alloc)});
        return;
    };

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