/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */

/* tests/gcred.c - Test harness for referrals */

/*

 * Copyright (C) 2012 by the Massachusetts Institute of Technology.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * * Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 *

 * * Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in

 *   the documentation and/or other materials provided with the

 *   distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

 * OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * This program is intended to be run from a python script as:

 *

 *     gcred [-f] [-t] nametype princname

 *

 * where nametype is one of "unknown", "principal", "srv-inst", and "srv-hst",

 * and princname is the name of the service principal.  gcred acquires

 * credentials for the specified server principal.  On success, gcred displays

 * the server principal name of the obtained credentials to stdout and exits

 * with status 0.  On failure, gcred displays the error message for the failed

 * operation to stderr and exits with status 1.

 *

 * The -f and -t flags set the KRB5_GC_FORWARDABLE and KRB5_GC_NO_TRANSIT_CHECK

 * options respectively.

 */

#include "k5-int.h"

static krb5_context ctx;

static void

check(krb5_error_code code)

{

    const char *errmsg;

    if (code) {

        errmsg = krb5_get_error_message(ctx, code);

        fprintf(stderr, "%s\n", errmsg);

        krb5_free_error_message(ctx, errmsg);

        exit(1);

    }

}

int

main(int argc, char **argv)

{

    krb5_principal client, server;

    krb5_ccache ccache;

    krb5_creds in_creds, *creds;

    krb5_ticket *ticket;

    krb5_flags options = 0;

    char *name;

    int c;

    check(krb5_init_context(&ctx));

    while ((c = getopt(argc, argv, "ft")) != -1) {

        switch (c) {

        case 'f':

            options |= KRB5_GC_FORWARDABLE;

            break;

        case 't':

            options |= KRB5_GC_NO_TRANSIT_CHECK;

            break;

        default:

            abort();

        }

    }

    argc -= optind;

    argv += optind;

    assert(argc == 2);

    check(krb5_parse_name(ctx, argv[1], &server));

    if (strcmp(argv[0], "unknown") == 0)

        server->type = KRB5_NT_UNKNOWN;

    else if (strcmp(argv[0], "principal") == 0)

        server->type = KRB5_NT_PRINCIPAL;

    else if (strcmp(argv[0], "srv-inst") == 0)

        server->type = KRB5_NT_SRV_INST;

    else if (strcmp(argv[0], "srv-hst") == 0)

        server->type = KRB5_NT_SRV_HST;

    else

        abort();

    check(krb5_cc_default(ctx, &ccache));

    check(krb5_cc_get_principal(ctx, ccache, &client));

    memset(&in_creds, 0, sizeof(in_creds));

    in_creds.client = client;

    in_creds.server = server;

    check(krb5_get_credentials(ctx, options, ccache, &in_creds, &creds));

    check(krb5_decode_ticket(&creds->ticket, &ticket));

    check(krb5_unparse_name(ctx, ticket->server, &name));

    printf("%s\n", name);

    krb5_free_ticket(ctx, ticket);

    krb5_free_unparsed_name(ctx, name);

    krb5_free_creds(ctx, creds);

    krb5_free_principal(ctx, client);

    krb5_free_principal(ctx, server);

    krb5_cc_close(ctx, ccache);

    krb5_free_context(ctx);

    return 0;

}