/*
 * Copyright (c) 1997-2001, 2003-2006 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 "kadm5_locl.h"

RCSID("$Id$");

struct randkey_principal_hook_ctx {
    kadm5_server_context *context;
    enum kadm5_hook_stage stage;
    krb5_error_code code;
    krb5_const_principal princ;
};

static krb5_error_code KRB5_LIB_CALL
randkey_principal_hook_cb(krb5_context context,
			 const void *hook,
			 void *hookctx,
			 void *userctx)
{
    krb5_error_code ret;
    const struct kadm5_hook_ftable *ftable = hook;
    struct randkey_principal_hook_ctx *ctx = userctx;

    ret = ftable->randkey(context, hookctx,
			 ctx->stage, ctx->code, ctx->princ);
    if (ret != 0 && ret != KRB5_PLUGIN_NO_HANDLE)
	_kadm5_s_set_hook_error_message(ctx->context, ret, "randkey",
					hook, ctx->stage);

    /* only pre-commit plugins can abort */
    if (ret == 0 || ctx->stage == KADM5_HOOK_STAGE_POSTCOMMIT)
	ret = KRB5_PLUGIN_NO_HANDLE;

    return ret;
}

static kadm5_ret_t
randkey_principal_hook(kadm5_server_context *context,
		      enum kadm5_hook_stage stage,
		      krb5_error_code code,
		      krb5_const_principal princ)
{
    krb5_error_code ret;
    struct randkey_principal_hook_ctx ctx;

    ctx.context = context;
    ctx.stage = stage;
    ctx.code = code;
    ctx.princ = princ;

    ret = _krb5_plugin_run_f(context->context, &kadm5_hook_plugin_data,
			     0, &ctx, randkey_principal_hook_cb);
    if (ret == KRB5_PLUGIN_NO_HANDLE)
	ret = 0;

    return ret;
}

/*
 * Set the keys of `princ' to random values, returning the random keys
 * in `new_keys', `n_keys'.
 */

kadm5_ret_t
kadm5_s_randkey_principal(void *server_handle,
			  krb5_principal princ,
			  krb5_boolean keepold,
			  int n_ks_tuple,
			  krb5_key_salt_tuple *ks_tuple,
			  krb5_keyblock **new_keys,
			  int *n_keys)
{
    kadm5_server_context *context = server_handle;
    hdb_entry ent;
    kadm5_ret_t ret;
    size_t i;

    memset(&ent, 0, sizeof(ent));
    if (!context->keep_open) {
	ret = context->db->hdb_open(context->context, context->db, O_RDWR, 0);
	if(ret)
	    return ret;

        if (context->config.mask & KADM5_CONFIG_ASYNC_HDB_WRITES) {
            ret = context->db->hdb_set_sync(context->context, context->db, 0);
            if (ret)
                return ret;
        }
    }

    ret = kadm5_log_init(context);
    if (ret)
        goto out;

    /* NOTE: We do not use hdb_fetch_kvno() here (maybe we should) */
    ret = context->db->hdb_fetch_kvno(context->context, context->db, princ,
                                      HDB_F_DECRYPT|HDB_F_GET_ANY|HDB_F_ADMIN_DATA,
                                      0, &ent);
    if(ret)
	goto out2;

    ret = randkey_principal_hook(context, KADM5_HOOK_STAGE_PRECOMMIT, 0, princ);
    if (ret)
	goto out3;

    if (keepold) {
	ret = hdb_add_current_keys_to_history(context->context, &ent);
        if (ret == 0 && keepold == 1)
            ret = hdb_prune_keys_kvno(context->context, &ent, 0);
	if (ret)
	    goto out3;
    } else {
        /* Remove all key history */
        ret = hdb_clear_extension(context->context, &ent,
                                  choice_HDB_extension_data_hist_keys);
	if (ret)
	    goto out3;
    }

    ret = _kadm5_set_keys_randomly(context, &ent, n_ks_tuple, ks_tuple,
                                   new_keys, n_keys);
    if (ret)
	goto out3;
    ent.kvno++;

    ent.flags.require_pwchange = 0;

    ret = _kadm5_set_modifier(context, &ent);
    if(ret)
	goto out4;
    ret = _kadm5_bump_pw_expire(context, &ent);
    if (ret)
	goto out4;

    if (keepold) {
	ret = hdb_seal_keys(context->context, context->db, &ent);
	if (ret)
	    goto out4;
    } else {
	HDB_extension ext;

	memset(&ext, 0, sizeof (ext));
        ext.mandatory = FALSE;
	ext.data.element = choice_HDB_extension_data_hist_keys;
	ext.data.u.hist_keys.len = 0;
	ext.data.u.hist_keys.val = NULL;
	hdb_replace_extension(context->context, &ent, &ext);
    }

    /* This logs the change for iprop and writes to the HDB */
    ret = kadm5_log_modify(context, &ent,
                           KADM5_ATTRIBUTES | KADM5_PRINCIPAL |
                           KADM5_MOD_NAME | KADM5_MOD_TIME |
                           KADM5_KEY_DATA | KADM5_KVNO |
                           KADM5_PW_EXPIRATION | KADM5_TL_DATA);

    (void) randkey_principal_hook(context, KADM5_HOOK_STAGE_POSTCOMMIT, ret, princ);

 out4:
    if (ret) {
	for (i = 0; i < *n_keys; ++i)
	    krb5_free_keyblock_contents(context->context, &(*new_keys)[i]);
	free (*new_keys);
	*new_keys = NULL;
	*n_keys = 0;
    }
 out3:
    hdb_free_entry(context->context, context->db, &ent);
 out2:
    (void) kadm5_log_end(context);
 out:
    if (!context->keep_open) {
        kadm5_ret_t ret2;
        ret2 = context->db->hdb_close(context->context, context->db);
        if (ret == 0 && ret2 != 0)
            ret = ret2;
    }
    return _kadm5_error_code(ret);
}
