crypto/provider_conf.c

   1 /*
   2  * Copyright 2019-2021 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 <string.h>
  11 #include <openssl/trace.h>
  12 #include <openssl/err.h>
  13 #include <openssl/conf.h>
  14 #include <openssl/safestack.h>
  15 #include "internal/provider.h"
  16
  17 DEFINE_STACK_OF(OSSL_PROVIDER)
  18
  19 /* PROVIDER config module */
  20
  21 static STACK_OF(OSSL_PROVIDER) *activated_providers = NULL;
  22
  23 static const char *skip_dot(const char *name)
  24 {
  25     const char *p = strchr(name, '.');
  26
  27     if (p != NULL)
  28         return p + 1;
  29     return name;
  30 }
  31
  32 static int provider_conf_params(OSSL_PROVIDER *prov,
  33                                 const char *name, const char *value,
  34                                 const CONF *cnf)
  35 {
  36     STACK_OF(CONF_VALUE) *sect;
  37     int ok = 1;
  38
  39     sect = NCONF_get_section(cnf, value);
  40     if (sect != NULL) {
  41         int i;
  42         char buffer[512];
  43         size_t buffer_len = 0;
  44
  45         OSSL_TRACE1(CONF, "Provider params: start section %s\n", value);
  46
  47         if (name != NULL) {
  48             OPENSSL_strlcpy(buffer, name, sizeof(buffer));
  49             OPENSSL_strlcat(buffer, ".", sizeof(buffer));
  50             buffer_len = strlen(buffer);
  51         }
  52
  53         for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
  54             CONF_VALUE *sectconf = sk_CONF_VALUE_value(sect, i);
  55
  56             if (buffer_len + strlen(sectconf->name) >= sizeof(buffer))
  57                 return 0;
  58             buffer[buffer_len] = '\0';
  59             OPENSSL_strlcat(buffer, sectconf->name, sizeof(buffer));
  60             if (!provider_conf_params(prov, buffer, sectconf->value, cnf))
  61                 return 0;
  62         }
  63
  64         OSSL_TRACE1(CONF, "Provider params: finish section %s\n", value);
  65     } else {
  66         OSSL_TRACE2(CONF, "Provider params: %s = %s\n", name, value);
  67         ok = ossl_provider_add_parameter(prov, name, value);
  68     }
  69
  70     return ok;
  71 }
  72
  73 static int provider_conf_load(OSSL_LIB_CTX *libctx, const char *name,
  74                               const char *value, const CONF *cnf)
  75 {
  76     int i;
  77     STACK_OF(CONF_VALUE) *ecmds;
  78     int soft = 0;
  79     OSSL_PROVIDER *prov = NULL;
  80     const char *path = NULL;
  81     long activate = 0;
  82     int ok = 0;
  83
  84     name = skip_dot(name);
  85     OSSL_TRACE1(CONF, "Configuring provider %s\n", name);
  86     /* Value is a section containing PROVIDER commands */
  87     ecmds = NCONF_get_section(cnf, value);
  88
  89     if (!ecmds) {
  90         ERR_raise_data(ERR_LIB_CRYPTO, CRYPTO_R_PROVIDER_SECTION_ERROR,
  91                        "section=%s not found", value);
  92         return 0;
  93     }
  94
  95     /* Find the needed data first */
  96     for (i = 0; i < sk_CONF_VALUE_num(ecmds); i++) {
  97         CONF_VALUE *ecmd = sk_CONF_VALUE_value(ecmds, i);
  98         const char *confname = skip_dot(ecmd->name);
  99         const char *confvalue = ecmd->value;
 100
 101         OSSL_TRACE2(CONF, "Provider command: %s = %s\n",
 102                     confname, confvalue);
 103
 104         /* First handle some special pseudo confs */
 105
 106         /* Override provider name to use */
 107         if (strcmp(confname, "identity") == 0)
 108             name = confvalue;
 109         else if (strcmp(confname, "soft_load") == 0)
 110             soft = 1;
 111         /* Load a dynamic PROVIDER */
 112         else if (strcmp(confname, "module") == 0)
 113             path = confvalue;
 114         else if (strcmp(confname, "activate") == 0)
 115             activate = 1;
 116     }
 117
 118     prov = ossl_provider_find(libctx, name, 1);
 119     if (prov == NULL)
 120         prov = ossl_provider_new(libctx, name, NULL, 1);
 121     if (prov == NULL) {
 122         if (soft)
 123             ERR_clear_error();
 124         return 0;
 125     }
 126
 127     if (path != NULL)
 128         ossl_provider_set_module_path(prov, path);
 129
 130     ok = provider_conf_params(prov, NULL, value, cnf);
 131
 132     if (ok && activate) {
 133         if (!ossl_provider_activate(prov, 0)) {
 134             ok = 0;
 135         } else {
 136             if (activated_providers == NULL)
 137                 activated_providers = sk_OSSL_PROVIDER_new_null();
 138             sk_OSSL_PROVIDER_push(activated_providers, prov);
 139             ok = 1;
 140         }
 141     }
 142
 143     if (!(activate && ok))
 144         ossl_provider_free(prov);
 145
 146     return ok;
 147 }
 148
 149 static int provider_conf_init(CONF_IMODULE *md, const CONF *cnf)
 150 {
 151     STACK_OF(CONF_VALUE) *elist;
 152     CONF_VALUE *cval;
 153     int i;
 154
 155     OSSL_TRACE1(CONF, "Loading providers module: section %s\n",
 156                 CONF_imodule_get_value(md));
 157
 158     /* Value is a section containing PROVIDERs to configure */
 159     elist = NCONF_get_section(cnf, CONF_imodule_get_value(md));
 160
 161     if (!elist) {
 162         ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_PROVIDER_SECTION_ERROR);
 163         return 0;
 164     }
 165
 166     for (i = 0; i < sk_CONF_VALUE_num(elist); i++) {
 167         cval = sk_CONF_VALUE_value(elist, i);
 168         if (!provider_conf_load(cnf->libctx, cval->name, cval->value, cnf))
 169             return 0;
 170     }
 171
 172     return 1;
 173 }
 174
 175
 176 static void provider_conf_deinit(CONF_IMODULE *md)
 177 {
 178     sk_OSSL_PROVIDER_pop_free(activated_providers, ossl_provider_free);
 179     activated_providers = NULL;
 180     OSSL_TRACE(CONF, "Cleaned up providers\n");
 181 }
 182
 183 void ossl_provider_add_conf_module(void)
 184 {
 185     OSSL_TRACE(CONF, "Adding config module 'providers'\n");
 186     CONF_module_add("providers", provider_conf_init, provider_conf_deinit);
 187 }