/*
 * Copyright (c) 2003-2007 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. Neither the name of KTH nor the names of its contributors may be
 *    used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY KTH AND ITS 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 KTH OR ITS 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.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <roken.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <gssapi.h>
#include <gssapi_krb5.h>
#include <gssapi_spnego.h>
#include <err.h>
#include <getarg.h>

#include "test_common.h"

static void
print_time(OM_uint32 time_rec)
{
    if (time_rec == GSS_C_INDEFINITE) {
        printf("cred never expire\n");
    } else {
        time_t t = time_rec + time(NULL);
        printf("expiration time: %s", ctime(&t));
    }
}

#if 0

static void
test_add(gss_cred_id_t cred_handle)
{
    OM_uint32 major_status, minor_status;
    gss_cred_id_t copy_cred;
    OM_uint32 time_rec;

    major_status = gss_add_cred (&minor_status,
                                 cred_handle,
                                 GSS_C_NO_NAME,
                                 GSS_KRB5_MECHANISM,
                                 GSS_C_INITIATE,
                                 0,
                                 0,
                                 &copy_cred,
                                 NULL,
                                 &time_rec,
                                 NULL);

    if (GSS_ERROR(major_status))
        errx(1, "add_cred failed");

    print_time(time_rec);

    major_status = gss_release_cred(&minor_status,
                                    &copy_cred);
    if (GSS_ERROR(major_status))
        errx(1, "release_cred failed");
}

static void
copy_cred(void)
{
    OM_uint32 major_status, minor_status;
    gss_cred_id_t cred_handle;
    OM_uint32 time_rec;

    major_status = gss_acquire_cred(&minor_status,
                                    GSS_C_NO_NAME,
                                    0,
                                    NULL,
                                    GSS_C_INITIATE,
                                    &cred_handle,
                                    NULL,
                                    &time_rec);
    if (GSS_ERROR(major_status))
        errx(1, "acquire_cred failed");

    print_time(time_rec);

    test_add(cred_handle);
    test_add(cred_handle);
    test_add(cred_handle);

    major_status = gss_release_cred(&minor_status,
                                    &cred_handle);
    if (GSS_ERROR(major_status))
        errx(1, "release_cred failed");
}
#endif

static gss_cred_id_t
acquire_cred_service(const char *service,
                     gss_OID nametype,
                     gss_OID_set oidset,
                     int flags)
{
    OM_uint32 major_status, minor_status;
    gss_cred_id_t cred_handle;
    OM_uint32 time_rec;
    gss_buffer_desc name_buffer;
    gss_name_t name = GSS_C_NO_NAME;

    if (service) {
        name_buffer.value = rk_UNCONST(service);
        name_buffer.length = strlen(service);

        major_status = gss_import_name(&minor_status,
                                       &name_buffer,
                                       nametype,
                                       &name);
        if (GSS_ERROR(major_status))
            errx(1, "import_name failed");
    }

    major_status = gss_acquire_cred(&minor_status,
                                    name,
                                    0,
                                    oidset,
                                    flags,
                                    &cred_handle,
                                    NULL,
                                    &time_rec);
    if (GSS_ERROR(major_status)) {
        warnx("acquire_cred failed: %s",
             gssapi_err(major_status, minor_status, GSS_C_NO_OID));
    } else {
        print_time(time_rec);
        gss_release_cred(&minor_status, &cred_handle);
    }

    if (name != GSS_C_NO_NAME)
        gss_release_name(&minor_status, &name);

    if (GSS_ERROR(major_status))
        exit(1);

    return cred_handle;
}

static int version_flag = 0;
static int help_flag    = 0;
static int kerberos_flag = 0;
static int enctype = 0;
static char *acquire_name;
static char *acquire_type;
static char *target_name;
static char *name_type;
static char *ccache;
static int num_loops = 1;

static struct getargs args[] = {
    {"acquire-name", 0, arg_string,     &acquire_name, "name", NULL },
    {"acquire-type", 0, arg_string,     &acquire_type, "type", NULL },
    {"enctype", 0,      arg_integer,    &enctype, "enctype-num", NULL },
    {"loops", 0,        arg_integer,    &num_loops, "enctype-num", NULL },
    {"kerberos", 0,     arg_flag,       &kerberos_flag, "enctype-num", NULL },
    {"target-name", 0,  arg_string,     &target_name, "name", NULL },
    {"ccache", 0,       arg_string,     &ccache, "name", NULL },
    {"name-type", 0,    arg_string,     &name_type, "type", NULL },
    {"version", 0,      arg_flag,       &version_flag, "print version", NULL },
    {"help",    0,      arg_flag,       &help_flag,  NULL, NULL }
};

static void
usage (int ret)
{
    arg_printusage (args, sizeof(args)/sizeof(*args), NULL, "");
    exit (ret);
}

int
main(int argc, char **argv)
{
    gss_OID_set oidset = GSS_C_NULL_OID_SET;
    gss_OID mechoid = GSS_C_NO_OID;
    OM_uint32 maj_stat, min_stat;
    gss_cred_id_t cred;
    gss_name_t target = GSS_C_NO_NAME;
    int i, optidx = 0;
    OM_uint32 flag;
    gss_OID type;

    setprogname(argv[0]);
    if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
        usage(1);

    if (help_flag)
        usage (0);

    if(version_flag){
        print_version(NULL);
        exit(0);
    }

    argc -= optidx;
    argv += optidx;

    if (argc != 0)
        usage(1);

    if (acquire_type) {
        if (strcasecmp(acquire_type, "both") == 0)
            flag = GSS_C_BOTH;
        else if (strcasecmp(acquire_type, "accept") == 0)
            flag = GSS_C_ACCEPT;
        else if (strcasecmp(acquire_type, "initiate") == 0)
            flag = GSS_C_INITIATE;
        else
            errx(1, "unknown type %s", acquire_type);
    } else
        flag = GSS_C_ACCEPT;

    if (name_type) {
        if (strcasecmp("hostbased-service", name_type) == 0)
            type = GSS_C_NT_HOSTBASED_SERVICE;
        else if (strcasecmp("user-name", name_type) == 0)
            type = GSS_C_NT_USER_NAME;
        else
            errx(1, "unknown name type %s", name_type);
    } else
        type = GSS_C_NT_HOSTBASED_SERVICE;

    if (ccache) {
        maj_stat = gss_krb5_ccache_name(&min_stat, ccache, NULL);
        if (GSS_ERROR(maj_stat))
            errx(1, "gss_krb5_ccache_name %s",
                 gssapi_err(maj_stat, min_stat, GSS_C_NO_OID));
    }

    if (kerberos_flag) {
        mechoid = GSS_KRB5_MECHANISM;

        maj_stat = gss_create_empty_oid_set(&min_stat, &oidset);
        if (maj_stat != GSS_S_COMPLETE)
            errx(1, "gss_create_empty_oid_set: %s",
                 gssapi_err(maj_stat, min_stat, GSS_C_NO_OID));

        maj_stat = gss_add_oid_set_member(&min_stat, GSS_KRB5_MECHANISM, &oidset);
        if (maj_stat != GSS_S_COMPLETE)
            errx(1, "gss_add_oid_set_member: %s",
                 gssapi_err(maj_stat, min_stat, GSS_C_NO_OID));
    }

    if (target_name) {
        gss_buffer_desc name;

        name.value = target_name;
        name.length = strlen(target_name);
        maj_stat = gss_import_name(&min_stat, &name,
                                   GSS_C_NT_HOSTBASED_SERVICE, &target);
        if (maj_stat != GSS_S_COMPLETE)
            errx(1, "gss_import_name: %s",
                 gssapi_err(maj_stat, min_stat, GSS_C_NO_OID));
    }

    for (i = 0; i < num_loops; i++) {

        cred = acquire_cred_service(acquire_name, type, oidset, flag);

        if (enctype) {
            int32_t enctypelist = enctype;

            maj_stat = gss_krb5_set_allowable_enctypes(&min_stat, cred,
                                                       1, &enctypelist);
            if (maj_stat)
                errx(1, "gss_krb5_set_allowable_enctypes: %s",
                     gssapi_err(maj_stat, min_stat, GSS_C_NO_OID));
        }

        if (target) {
            gss_ctx_id_t context = GSS_C_NO_CONTEXT;
            gss_buffer_desc out;

            out.length = 0;
            out.value = NULL;

            maj_stat = gss_init_sec_context(&min_stat,
                                            cred, &context,
                                            target, mechoid,
                                            GSS_C_MUTUAL_FLAG, 0, NULL,
                                            GSS_C_NO_BUFFER, NULL,
                                            &out, NULL, NULL);
            if (maj_stat != GSS_S_COMPLETE && maj_stat != GSS_S_CONTINUE_NEEDED)
                errx(1, "init_sec_context failed: %s",
                     gssapi_err(maj_stat, min_stat, GSS_C_NO_OID));

            gss_release_buffer(&min_stat, &out);
            gss_delete_sec_context(&min_stat, &context, NULL);
        }
        gss_release_cred(&min_stat, &cred);
    }


    return 0;
}