crypto/engine/eng_cnf.c

   1 /*
   2  * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "eng_local.h"
  11 #include <openssl/conf.h>
  12 #include <openssl/trace.h>
  13
  14 DEFINE_STACK_OF(CONF_VALUE)
  15
  16 /* ENGINE config module */
  17
  18 static const char *skip_dot(const char *name)
  19 {
  20     const char *p = strchr(name, '.');
  21
  22     if (p != NULL)
  23         return p + 1;
  24     return name;
  25 }
  26
  27 static STACK_OF(ENGINE) *initialized_engines = NULL;
  28
  29 static int int_engine_init(ENGINE *e)
  30 {
  31     if (!ENGINE_init(e))
  32         return 0;
  33     if (!initialized_engines)
  34         initialized_engines = sk_ENGINE_new_null();
  35     if (!initialized_engines || !sk_ENGINE_push(initialized_engines, e)) {
  36         ENGINE_finish(e);
  37         return 0;
  38     }
  39     return 1;
  40 }
  41
  42 static int int_engine_configure(const char *name, const char *value, const CONF *cnf)
  43 {
  44     int i;
  45     int ret = 0;
  46     long do_init = -1;
  47     STACK_OF(CONF_VALUE) *ecmds;
  48     CONF_VALUE *ecmd = NULL;
  49     const char *ctrlname, *ctrlvalue;
  50     ENGINE *e = NULL;
  51     int soft = 0;
  52
  53     name = skip_dot(name);
  54     OSSL_TRACE1(CONF, "Configuring engine %s\n", name);
  55     /* Value is a section containing ENGINE commands */
  56     ecmds = NCONF_get_section(cnf, value);
  57
  58     if (!ecmds) {
  59         ENGINEerr(ENGINE_F_INT_ENGINE_CONFIGURE,
  60                   ENGINE_R_ENGINE_SECTION_ERROR);
  61         return 0;
  62     }
  63
  64     for (i = 0; i < sk_CONF_VALUE_num(ecmds); i++) {
  65         ecmd = sk_CONF_VALUE_value(ecmds, i);
  66         ctrlname = skip_dot(ecmd->name);
  67         ctrlvalue = ecmd->value;
  68         OSSL_TRACE2(CONF, "ENGINE: doing ctrl(%s,%s)\n",
  69                     ctrlname, ctrlvalue);
  70
  71         /* First handle some special pseudo ctrls */
  72
  73         /* Override engine name to use */
  74         if (strcmp(ctrlname, "engine_id") == 0)
  75             name = ctrlvalue;
  76         else if (strcmp(ctrlname, "soft_load") == 0)
  77             soft = 1;
  78         /* Load a dynamic ENGINE */
  79         else if (strcmp(ctrlname, "dynamic_path") == 0) {
  80             e = ENGINE_by_id("dynamic");
  81             if (!e)
  82                 goto err;
  83             if (!ENGINE_ctrl_cmd_string(e, "SO_PATH", ctrlvalue, 0))
  84                 goto err;
  85             if (!ENGINE_ctrl_cmd_string(e, "LIST_ADD", "2", 0))
  86                 goto err;
  87             if (!ENGINE_ctrl_cmd_string(e, "LOAD", NULL, 0))
  88                 goto err;
  89         }
  90         /* ... add other pseudos here ... */
  91         else {
  92             /*
  93              * At this point we need an ENGINE structural reference if we
  94              * don't already have one.
  95              */
  96             if (!e) {
  97                 e = ENGINE_by_id(name);
  98                 if (!e && soft) {
  99                     ERR_clear_error();
 100                     return 1;
 101                 }
 102                 if (!e)
 103                     goto err;
 104             }
 105             /*
 106              * Allow "EMPTY" to mean no value: this allows a valid "value" to
 107              * be passed to ctrls of type NO_INPUT
 108              */
 109             if (strcmp(ctrlvalue, "EMPTY") == 0)
 110                 ctrlvalue = NULL;
 111             if (strcmp(ctrlname, "init") == 0) {
 112                 if (!NCONF_get_number_e(cnf, value, "init", &do_init))
 113                     goto err;
 114                 if (do_init == 1) {
 115                     if (!int_engine_init(e))
 116                         goto err;
 117                 } else if (do_init != 0) {
 118                     ENGINEerr(ENGINE_F_INT_ENGINE_CONFIGURE,
 119                               ENGINE_R_INVALID_INIT_VALUE);
 120                     goto err;
 121                 }
 122             } else if (strcmp(ctrlname, "default_algorithms") == 0) {
 123                 if (!ENGINE_set_default_string(e, ctrlvalue))
 124                     goto err;
 125             } else if (!ENGINE_ctrl_cmd_string(e, ctrlname, ctrlvalue, 0))
 126                 goto err;
 127         }
 128
 129     }
 130     if (e && (do_init == -1) && !int_engine_init(e)) {
 131         ecmd = NULL;
 132         goto err;
 133     }
 134     ret = 1;
 135  err:
 136     if (ret != 1) {
 137         ENGINEerr(ENGINE_F_INT_ENGINE_CONFIGURE,
 138                   ENGINE_R_ENGINE_CONFIGURATION_ERROR);
 139         if (ecmd)
 140             ERR_add_error_data(6, "section=", ecmd->section,
 141                                ", name=", ecmd->name,
 142                                ", value=", ecmd->value);
 143     }
 144     ENGINE_free(e);
 145     return ret;
 146 }
 147
 148 static int int_engine_module_init(CONF_IMODULE *md, const CONF *cnf)
 149 {
 150     STACK_OF(CONF_VALUE) *elist;
 151     CONF_VALUE *cval;
 152     int i;
 153     OSSL_TRACE2(CONF, "Called engine module: name %s, value %s\n",
 154                 CONF_imodule_get_name(md), CONF_imodule_get_value(md));
 155     /* Value is a section containing ENGINEs to configure */
 156     elist = NCONF_get_section(cnf, CONF_imodule_get_value(md));
 157
 158     if (!elist) {
 159         ENGINEerr(ENGINE_F_INT_ENGINE_MODULE_INIT,
 160                   ENGINE_R_ENGINES_SECTION_ERROR);
 161         return 0;
 162     }
 163
 164     for (i = 0; i < sk_CONF_VALUE_num(elist); i++) {
 165         cval = sk_CONF_VALUE_value(elist, i);
 166         if (!int_engine_configure(cval->name, cval->value, cnf))
 167             return 0;
 168     }
 169
 170     return 1;
 171 }
 172
 173 static void int_engine_module_finish(CONF_IMODULE *md)
 174 {
 175     ENGINE *e;
 176
 177     while ((e = sk_ENGINE_pop(initialized_engines)))
 178         ENGINE_finish(e);
 179     sk_ENGINE_free(initialized_engines);
 180     initialized_engines = NULL;
 181 }
 182
 183 void ENGINE_add_conf_module(void)
 184 {
 185     CONF_module_add("engines",
 186                     int_engine_module_init, int_engine_module_finish);
 187 }