crypto/engine/eng_cnf.c

   1 /*
   2  * Copyright 2002-2020 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 /* We need to use some engine deprecated APIs */
  11 #define OPENSSL_SUPPRESS_DEPRECATED
  12
  13 #include "eng_local.h"
  14 #include <openssl/conf.h>
  15 #include <openssl/trace.h>
  16
  17 /* ENGINE config module */
  18
  19 static const char *skip_dot(const char *name)
  20 {
  21     const char *p = strchr(name, '.');
  22
  23     if (p != NULL)
  24         return p + 1;
  25     return name;
  26 }
  27
  28 static STACK_OF(ENGINE) *initialized_engines = NULL;
  29
  30 static int int_engine_init(ENGINE *e)
  31 {
  32     if (!ENGINE_init(e))
  33         return 0;
  34     if (!initialized_engines)
  35         initialized_engines = sk_ENGINE_new_null();
  36     if (!initialized_engines || !sk_ENGINE_push(initialized_engines, e)) {
  37         ENGINE_finish(e);
  38         return 0;
  39     }
  40     return 1;
  41 }
  42
  43 static int int_engine_configure(const char *name, const char *value, const CONF *cnf)
  44 {
  45     int i;
  46     int ret = 0;
  47     long do_init = -1;
  48     STACK_OF(CONF_VALUE) *ecmds;
  49     CONF_VALUE *ecmd = NULL;
  50     const char *ctrlname, *ctrlvalue;
  51     ENGINE *e = NULL;
  52     int soft = 0;
  53
  54     name = skip_dot(name);
  55     OSSL_TRACE1(CONF, "Configuring engine %s\n", name);
  56     /* Value is a section containing ENGINE commands */
  57     ecmds = NCONF_get_section(cnf, value);
  58
  59     if (!ecmds) {
  60         ERR_raise(ERR_LIB_ENGINE, 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                     ERR_raise(ERR_LIB_ENGINE, ENGINE_R_INVALID_INIT_VALUE);
 119                     goto err;
 120                 }
 121             } else if (strcmp(ctrlname, "default_algorithms") == 0) {
 122                 if (!ENGINE_set_default_string(e, ctrlvalue))
 123                     goto err;
 124             } else if (!ENGINE_ctrl_cmd_string(e, ctrlname, ctrlvalue, 0))
 125                 goto err;
 126         }
 127
 128     }
 129     if (e && (do_init == -1) && !int_engine_init(e)) {
 130         ecmd = NULL;
 131         goto err;
 132     }
 133     ret = 1;
 134  err:
 135     if (ret != 1) {
 136         ERR_raise(ERR_LIB_ENGINE,
 137                   ENGINE_R_ENGINE_CONFIGURATION_ERROR);
 138         if (ecmd)
 139             ERR_add_error_data(6, "section=", ecmd->section,
 140                                ", name=", ecmd->name,
 141                                ", value=", ecmd->value);
 142     }
 143     ENGINE_free(e);
 144     return ret;
 145 }
 146
 147 static int int_engine_module_init(CONF_IMODULE *md, const CONF *cnf)
 148 {
 149     STACK_OF(CONF_VALUE) *elist;
 150     CONF_VALUE *cval;
 151     int i;
 152     OSSL_TRACE2(CONF, "Called engine module: name %s, value %s\n",
 153                 CONF_imodule_get_name(md), CONF_imodule_get_value(md));
 154     /* Value is a section containing ENGINEs to configure */
 155     elist = NCONF_get_section(cnf, CONF_imodule_get_value(md));
 156
 157     if (!elist) {
 158         ERR_raise(ERR_LIB_ENGINE, ENGINE_R_ENGINES_SECTION_ERROR);
 159         return 0;
 160     }
 161
 162     for (i = 0; i < sk_CONF_VALUE_num(elist); i++) {
 163         cval = sk_CONF_VALUE_value(elist, i);
 164         if (!int_engine_configure(cval->name, cval->value, cnf))
 165             return 0;
 166     }
 167
 168     return 1;
 169 }
 170
 171 static void int_engine_module_finish(CONF_IMODULE *md)
 172 {
 173     ENGINE *e;
 174
 175     while ((e = sk_ENGINE_pop(initialized_engines)))
 176         ENGINE_finish(e);
 177     sk_ENGINE_free(initialized_engines);
 178     initialized_engines = NULL;
 179 }
 180
 181 void ENGINE_add_conf_module(void)
 182 {
 183     CONF_module_add("engines",
 184                     int_engine_module_init, int_engine_module_finish);
 185 }