/*

 * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include "eng_int.h"

#include <openssl/conf.h>

/* #define ENGINE_CONF_DEBUG */

/* ENGINE config module */

static const char *skip_dot(const char *name)

{

    const char *p = strchr(name, '.');

    if (p != NULL)

        return p + 1;

    return name;

}

static STACK_OF(ENGINE) *initialized_engines = NULL;

static int int_engine_init(ENGINE *e)

{

    if (!ENGINE_init(e))

        return 0;

    if (!initialized_engines)

        initialized_engines = sk_ENGINE_new_null();

    if (!initialized_engines || !sk_ENGINE_push(initialized_engines, e)) {

        ENGINE_finish(e);

        return 0;

    }

    return 1;

}

static int int_engine_configure(const char *name, const char *value, const CONF *cnf)

{

    int i;

    int ret = 0;

    long do_init = -1;

    STACK_OF(CONF_VALUE) *ecmds;

    CONF_VALUE *ecmd = NULL;

    const char *ctrlname, *ctrlvalue;

    ENGINE *e = NULL;

    int soft = 0;

    name = skip_dot(name);

#ifdef ENGINE_CONF_DEBUG

    fprintf(stderr, "Configuring engine %s\n", name);

#endif

    /* Value is a section containing ENGINE commands */

    ecmds = NCONF_get_section(cnf, value);

    if (!ecmds) {

        ENGINEerr(ENGINE_F_INT_ENGINE_CONFIGURE,

                  ENGINE_R_ENGINE_SECTION_ERROR);

        return 0;

    }

    for (i = 0; i < sk_CONF_VALUE_num(ecmds); i++) {

        ecmd = sk_CONF_VALUE_value(ecmds, i);

        ctrlname = skip_dot(ecmd->name);

        ctrlvalue = ecmd->value;

#ifdef ENGINE_CONF_DEBUG

        fprintf(stderr, "ENGINE conf: doing ctrl(%s,%s)\n", ctrlname,

                ctrlvalue);

#endif

        /* First handle some special pseudo ctrls */

        /* Override engine name to use */

        if (strcmp(ctrlname, "engine_id") == 0)

            name = ctrlvalue;

        else if (strcmp(ctrlname, "soft_load") == 0)

            soft = 1;

        /* Load a dynamic ENGINE */

        else if (strcmp(ctrlname, "dynamic_path") == 0) {

            e = ENGINE_by_id("dynamic");

            if (!e)

                goto err;

            if (!ENGINE_ctrl_cmd_string(e, "SO_PATH", ctrlvalue, 0))

                goto err;

            if (!ENGINE_ctrl_cmd_string(e, "LIST_ADD", "2", 0))

                goto err;

            if (!ENGINE_ctrl_cmd_string(e, "LOAD", NULL, 0))

                goto err;

        }

        /* ... add other pseudos here ... */

        else {

            /*

             * At this point we need an ENGINE structural reference if we

             * don't already have one.

             */

            if (!e) {

                e = ENGINE_by_id(name);

                if (!e && soft) {

                    ERR_clear_error();

                    return 1;

                }

                if (!e)

                    goto err;

            }

            /*

             * Allow "EMPTY" to mean no value: this allows a valid "value" to

             * be passed to ctrls of type NO_INPUT

             */

            if (strcmp(ctrlvalue, "EMPTY") == 0)

                ctrlvalue = NULL;

            if (strcmp(ctrlname, "init") == 0) {

                if (!NCONF_get_number_e(cnf, value, "init", &do_init))

                    goto err;

                if (do_init == 1) {

                    if (!int_engine_init(e))

                        goto err;

                } else if (do_init != 0) {

                    ENGINEerr(ENGINE_F_INT_ENGINE_CONFIGURE,

                              ENGINE_R_INVALID_INIT_VALUE);

                    goto err;

                }

            } else if (strcmp(ctrlname, "default_algorithms") == 0) {

                if (!ENGINE_set_default_string(e, ctrlvalue))

                    goto err;

            } else if (!ENGINE_ctrl_cmd_string(e, ctrlname, ctrlvalue, 0))

                goto err;

        }

    }

    if (e && (do_init == -1) && !int_engine_init(e)) {

        ecmd = NULL;

        goto err;

    }

    ret = 1;

 err:

    if (ret != 1) {

        ENGINEerr(ENGINE_F_INT_ENGINE_CONFIGURE,

                  ENGINE_R_ENGINE_CONFIGURATION_ERROR);

        if (ecmd)

            ERR_add_error_data(6, "section=", ecmd->section,

                               ", name=", ecmd->name,

                               ", value=", ecmd->value);

    }

    ENGINE_free(e);

    return ret;

}

static int int_engine_module_init(CONF_IMODULE *md, const CONF *cnf)

{

    STACK_OF(CONF_VALUE) *elist;

    CONF_VALUE *cval;

    int i;

#ifdef ENGINE_CONF_DEBUG

    fprintf(stderr, "Called engine module: name %s, value %s\n",

            CONF_imodule_get_name(md), CONF_imodule_get_value(md));

#endif

    /* Value is a section containing ENGINEs to configure */

    elist = NCONF_get_section(cnf, CONF_imodule_get_value(md));

    if (!elist) {

        ENGINEerr(ENGINE_F_INT_ENGINE_MODULE_INIT,

                  ENGINE_R_ENGINES_SECTION_ERROR);

        return 0;

    }

    for (i = 0; i < sk_CONF_VALUE_num(elist); i++) {

        cval = sk_CONF_VALUE_value(elist, i);

        if (!int_engine_configure(cval->name, cval->value, cnf))

            return 0;

    }

    return 1;

}

static void int_engine_module_finish(CONF_IMODULE *md)

{

    ENGINE *e;

    while ((e = sk_ENGINE_pop(initialized_engines)))

        ENGINE_finish(e);

    sk_ENGINE_free(initialized_engines);

    initialized_engines = NULL;

}

void ENGINE_add_conf_module(void)

{

    CONF_module_add("engines",

                    int_engine_module_init, int_engine_module_finish);

}