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eng_cnf.c

/* eng_cnf.c */
/* Written by Stephen Henson (steve@openssl.org) for the OpenSSL
 * project 2001.
 */
/* ====================================================================
 * Copyright (c) 2001 The OpenSSL Project.  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. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include "eng_int.h"
#include <openssl/conf.h>

/* #define ENGINE_CONF_DEBUG */

/* ENGINE config module */

static char *skip_dot(char *name)
      {
      char *p;
      p = strchr(name, '.');
      if (p)
            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(char *name, char *value, const CONF *cnf)
      {
      int i;
      int ret = 0;
      long do_init = -1;
      STACK_OF(CONF_VALUE) *ecmds;
      CONF_VALUE *ecmd;
      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"))
                  name = ctrlvalue;
            else if (!strcmp(ctrlname, "soft_load"))
                  soft = 1;
            /* Load a dynamic ENGINE */
            else if (!strcmp(ctrlname, "dynamic_path"))
                  {
                  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)
                              return 0;
                        }
                  /* Allow "EMPTY" to mean no value: this allows a valid
                   * "value" to be passed to ctrls of type NO_INPUT
                   */
                  if (!strcmp(ctrlvalue, "EMPTY"))
                        ctrlvalue = NULL;
                  if (!strcmp(ctrlname, "init"))
                        {
                        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"))
                        {
                        if (!ENGINE_set_default_string(e, ctrlvalue))
                              goto err;
                        }
                  else if (!ENGINE_ctrl_cmd_string(e,
                              ctrlname, ctrlvalue, 0))
                        return 0;
                  }



            }
      if (e && (do_init == -1) && !int_engine_init(e))
            goto err;
      ret = 1;
      err:
      if (e)
            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);
      }

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