/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2005 Doug Rabson
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

#include <gssapi/gssapi.h>
#include <stdlib.h>
#include <errno.h>

#include "mech_switch.h"
#include "cred.h"
#include "name.h"
#include "utils.h"

static struct _gss_mechanism_cred *
_gss_copy_cred(struct _gss_mechanism_cred *mc)
{
        struct _gss_mechanism_cred *new_mc;
        struct _gss_mech_switch *m = mc->gmc_mech;
        OM_uint32 major_status, minor_status;
        gss_name_t name;
        gss_cred_id_t cred;
        OM_uint32 initiator_lifetime, acceptor_lifetime;
        gss_cred_usage_t cred_usage;

        major_status = m->gm_inquire_cred_by_mech(&minor_status,
            mc->gmc_cred, mc->gmc_mech_oid,
            &name, &initiator_lifetime, &acceptor_lifetime, &cred_usage);
        if (major_status) {
                _gss_mg_error(m, major_status, minor_status);
                return (0);
        }

        major_status = m->gm_add_cred(&minor_status,
            GSS_C_NO_CREDENTIAL, name, mc->gmc_mech_oid,
            cred_usage, initiator_lifetime, acceptor_lifetime,
            &cred, 0, 0, 0);
        m->gm_release_name(&minor_status, &name);

        if (major_status) {
                _gss_mg_error(m, major_status, minor_status);
                return (0);
        }

        new_mc = malloc(sizeof(struct _gss_mechanism_cred));
        if (!new_mc) {
                m->gm_release_cred(&minor_status, &cred);
                return (0);
        }
        new_mc->gmc_mech = m;
        new_mc->gmc_mech_oid = &m->gm_mech_oid;
        new_mc->gmc_cred = cred;

        return (new_mc);
}

OM_uint32
gss_add_cred(OM_uint32 *minor_status,
    const gss_cred_id_t input_cred_handle,
    const gss_name_t desired_name,
    const gss_OID desired_mech,
    gss_cred_usage_t cred_usage,
    OM_uint32 initiator_time_req,
    OM_uint32 acceptor_time_req,
    gss_cred_id_t *output_cred_handle,
    gss_OID_set *actual_mechs,
    OM_uint32 *initiator_time_rec,
    OM_uint32 *acceptor_time_rec)
{
        OM_uint32 major_status;
        struct _gss_mech_switch *m;
        struct _gss_cred *cred = (struct _gss_cred *) input_cred_handle;
        struct _gss_cred *new_cred;
        gss_cred_id_t release_cred;
        struct _gss_mechanism_cred *mc, *target_mc, *copy_mc;
        struct _gss_mechanism_name *mn;
        OM_uint32 junk;

        *minor_status = 0;
        *output_cred_handle = GSS_C_NO_CREDENTIAL;
        if (initiator_time_rec)
                *initiator_time_rec = 0;
        if (acceptor_time_rec)
                *acceptor_time_rec = 0;
        if (actual_mechs)
                *actual_mechs = GSS_C_NO_OID_SET;

        new_cred = malloc(sizeof(struct _gss_cred));
        if (!new_cred) {
                *minor_status = ENOMEM;
                return (GSS_S_FAILURE);
        }
        SLIST_INIT(&new_cred->gc_mc);

        /*
         * We go through all the mc attached to the input_cred_handle
         * and check the mechanism. If it matches, we call
         * gss_add_cred for that mechanism, otherwise we copy the mc
         * to new_cred.
         */
        target_mc = NULL;
        if (cred) {
                SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) {
                        if (gss_oid_equal(mc->gmc_mech_oid, desired_mech)) {
                                target_mc = mc;
                        }
                        copy_mc = _gss_copy_cred(mc);
                        if (!copy_mc) {
                                release_cred = (gss_cred_id_t) new_cred;
                                gss_release_cred(&junk, &release_cred);
                                *minor_status = ENOMEM;
                                return (GSS_S_FAILURE);
                        }
                        SLIST_INSERT_HEAD(&new_cred->gc_mc, copy_mc, gmc_link);
                }
        }

        /*
         * Figure out a suitable mn, if any.
         */
        if (desired_name) {
                major_status = _gss_find_mn(minor_status,
                                            (struct _gss_name *) desired_name,
                                            desired_mech,
                                            &mn);
                if (major_status != GSS_S_COMPLETE) {
                        free(new_cred);
                        return (major_status);
                }
        } else {
                mn = NULL;
        }

        m = _gss_find_mech_switch(desired_mech);

        mc = malloc(sizeof(struct _gss_mechanism_cred));
        if (!mc) {
                release_cred = (gss_cred_id_t) new_cred;
                gss_release_cred(&junk, &release_cred);
                *minor_status = ENOMEM;
                return (GSS_S_FAILURE);
        }
        mc->gmc_mech = m;
        mc->gmc_mech_oid = &m->gm_mech_oid;

        major_status = m->gm_add_cred(minor_status,
            target_mc ? target_mc->gmc_cred : GSS_C_NO_CREDENTIAL,
            desired_name ? mn->gmn_name : GSS_C_NO_NAME,
            desired_mech,
            cred_usage,
            initiator_time_req,
            acceptor_time_req,
            &mc->gmc_cred,
            actual_mechs,
            initiator_time_rec,
            acceptor_time_rec);

        if (major_status) {
                _gss_mg_error(m, major_status, *minor_status);
                release_cred = (gss_cred_id_t) new_cred;
                gss_release_cred(&junk, &release_cred);
                free(mc);
                return (major_status);
        }
        SLIST_INSERT_HEAD(&new_cred->gc_mc, mc, gmc_link);
        *output_cred_handle = (gss_cred_id_t) new_cred;

        return (GSS_S_COMPLETE);
}