/*
 * Copyright (c) 2003 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 the Institute 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 THE INSTITUTE 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 INSTITUTE 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 "gsskrb5_locl.h"

OM_uint32 GSSAPI_CALLCONV
_gsskrb5_store_cred(OM_uint32         *minor_status,
		    gss_cred_id_t     input_cred_handle,
		    gss_cred_usage_t  cred_usage,
		    const gss_OID     desired_mech,
		    OM_uint32         overwrite_cred,
		    OM_uint32         default_cred,
		    gss_OID_set       *elements_stored,
		    gss_cred_usage_t  *cred_usage_stored)
{
    krb5_context context;
    krb5_error_code ret;
    gsskrb5_cred cred;
    krb5_ccache id = NULL;
    krb5_ccache def_ccache = NULL;
    const char *def_type = NULL;
    time_t exp_current;
    time_t exp_new;

    *minor_status = 0;

    if (cred_usage != GSS_C_INITIATE) {
	*minor_status = GSS_KRB5_S_G_BAD_USAGE;
	return GSS_S_FAILURE;
    }

    if (desired_mech != GSS_C_NO_OID &&
        gss_oid_equal(desired_mech, GSS_KRB5_MECHANISM) == 0)
	return GSS_S_BAD_MECH;

    cred = (gsskrb5_cred)input_cred_handle;
    if (cred == NULL)
	return GSS_S_NO_CRED;

    GSSAPI_KRB5_INIT (&context);

    HEIMDAL_MUTEX_lock(&cred->cred_id_mutex);
    if (cred->usage != cred_usage && cred->usage != GSS_C_BOTH) {
	HEIMDAL_MUTEX_unlock(&cred->cred_id_mutex);
	*minor_status = GSS_KRB5_S_G_BAD_USAGE;
	return GSS_S_FAILURE;
    }

    ret = krb5_cc_get_lifetime(context, cred->ccache, &exp_new);
    if (ret) {
	HEIMDAL_MUTEX_unlock(&cred->cred_id_mutex);
	*minor_status = ret;
	return GSS_S_NO_CRED;
    }

    if (cred->principal == NULL) {
	HEIMDAL_MUTEX_unlock(&cred->cred_id_mutex);
	*minor_status = GSS_KRB5_S_KG_TGT_MISSING;
	return GSS_S_FAILURE;
    }

    ret = krb5_cc_default(context, &def_ccache);
    if (ret == 0) {
        def_type = krb5_cc_get_type(context, def_ccache);
        krb5_cc_close(context, def_ccache);
    }
    def_ccache = NULL;

    /* write out cred to credential cache */
    ret = krb5_cc_cache_match(context, cred->principal, &id);
    if (ret) {
        if (default_cred) {
            ret = krb5_cc_default(context, &id);
            if (ret) {
                HEIMDAL_MUTEX_unlock(&cred->cred_id_mutex);
                *minor_status = ret;
                return GSS_S_FAILURE;
            }
        } else {
            if (def_type == NULL ||
                !krb5_cc_support_switch(context, def_type)) {
                HEIMDAL_MUTEX_unlock(&cred->cred_id_mutex);
                *minor_status = 0;      /* XXX */
                return GSS_S_NO_CRED;   /* XXX */
            }
            ret = krb5_cc_new_unique(context, def_type, NULL, &id);
            if (ret) {
                HEIMDAL_MUTEX_unlock(&cred->cred_id_mutex);
                *minor_status = ret;
                return GSS_S_FAILURE;
            }
            overwrite_cred = 1;
        }
    }

    if (!overwrite_cred) {
        /* If current creds are expired or near it, overwrite */
        ret = krb5_cc_get_lifetime(context, id, &exp_current);
        if (ret != 0 || exp_new > exp_current)
            overwrite_cred = 1;
    }

    if (!overwrite_cred) {
        /* Nothing to do */
        krb5_cc_close(context, id);
        HEIMDAL_MUTEX_unlock(&cred->cred_id_mutex);
        *minor_status = 0;
        return GSS_S_DUPLICATE_ELEMENT;
    }

    ret = krb5_cc_initialize(context, id, cred->principal);
    if (ret == 0)
	ret = krb5_cc_copy_match_f(context, cred->ccache, id, NULL, NULL, NULL);
    if (ret) {
        krb5_cc_close(context, id);
	HEIMDAL_MUTEX_unlock(&cred->cred_id_mutex);
	*minor_status = ret;
	return(GSS_S_FAILURE);
    }

    if (default_cred && def_type != NULL &&
        krb5_cc_support_switch(context, def_type))
	krb5_cc_switch(context, id);

    krb5_cc_close(context, id);
    HEIMDAL_MUTEX_unlock(&cred->cred_id_mutex);
    *minor_status = 0;
    return GSS_S_COMPLETE;
}
