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/*
* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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 <string.h>
#include <openssl/trace.h>
#include <openssl/err.h>
#include <openssl/conf.h>
#include <openssl/safestack.h>
#include "internal/provider.h"
DEFINE_STACK_OF(OSSL_PROVIDER)
/* PROVIDER config module */
static STACK_OF(OSSL_PROVIDER) *activated_providers = NULL;
static const char *skip_dot(const char *name)
{
const char *p = strchr(name, '.');
if (p != NULL)
return p + 1;
return name;
}
static int provider_conf_params(OSSL_PROVIDER *prov,
const char *name, const char *value,
const CONF *cnf)
{
STACK_OF(CONF_VALUE) *sect;
int ok = 1;
sect = NCONF_get_section(cnf, value);
if (sect != NULL) {
int i;
char buffer[512];
size_t buffer_len = 0;
OSSL_TRACE1(CONF, "Provider params: start section %s\n", value);
if (name != NULL) {
OPENSSL_strlcpy(buffer, name, sizeof(buffer));
OPENSSL_strlcat(buffer, ".", sizeof(buffer));
buffer_len = strlen(buffer);
}
for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
CONF_VALUE *sectconf = sk_CONF_VALUE_value(sect, i);
if (buffer_len + strlen(sectconf->name) >= sizeof(buffer))
return 0;
buffer[buffer_len] = '\0';
OPENSSL_strlcat(buffer, sectconf->name, sizeof(buffer));
if (!provider_conf_params(prov, buffer, sectconf->value, cnf))
return 0;
}
OSSL_TRACE1(CONF, "Provider params: finish section %s\n", value);
} else {
OSSL_TRACE2(CONF, "Provider params: %s = %s\n", name, value);
ok = ossl_provider_add_parameter(prov, name, value);
}
return ok;
}
static int provider_conf_load(OPENSSL_CTX *libctx, const char *name,
const char *value, const CONF *cnf)
{
int i;
STACK_OF(CONF_VALUE) *ecmds;
int soft = 0;
OSSL_PROVIDER *prov = NULL;
const char *path = NULL;
long activate = 0;
int ok = 0;
name = skip_dot(name);
OSSL_TRACE1(CONF, "Configuring provider %s\n", name);
/* Value is a section containing PROVIDER commands */
ecmds = NCONF_get_section(cnf, value);
if (!ecmds) {
CRYPTOerr(CRYPTO_F_PROVIDER_CONF_LOAD, CRYPTO_R_PROVIDER_SECTION_ERROR);
ERR_add_error_data(3, "section=", value, " not found");
return 0;
}
/* Find the needed data first */
for (i = 0; i < sk_CONF_VALUE_num(ecmds); i++) {
CONF_VALUE *ecmd = sk_CONF_VALUE_value(ecmds, i);
const char *confname = skip_dot(ecmd->name);
const char *confvalue = ecmd->value;
OSSL_TRACE2(CONF, "Provider command: %s = %s\n",
confname, confvalue);
/* First handle some special pseudo confs */
/* Override provider name to use */
if (strcmp(confname, "identity") == 0)
name = confvalue;
else if (strcmp(confname, "soft_load") == 0)
soft = 1;
/* Load a dynamic PROVIDER */
else if (strcmp(confname, "module") == 0)
path = confvalue;
else if (strcmp(confname, "activate") == 0)
activate = 1;
}
prov = ossl_provider_find(libctx, name, 1);
if (prov == NULL)
prov = ossl_provider_new(libctx, name, NULL, 1);
if (prov == NULL) {
if (soft)
ERR_clear_error();
return 0;
}
if (path != NULL)
ossl_provider_set_module_path(prov, path);
ok = provider_conf_params(prov, NULL, value, cnf);
if (ok && activate) {
if (!ossl_provider_activate(prov)) {
ok = 0;
} else {
if (activated_providers == NULL)
activated_providers = sk_OSSL_PROVIDER_new_null();
sk_OSSL_PROVIDER_push(activated_providers, prov);
ok = 1;
}
}
if (!(activate && ok))
ossl_provider_free(prov);
return ok;
}
static int provider_conf_init(CONF_IMODULE *md, const CONF *cnf)
{
STACK_OF(CONF_VALUE) *elist;
CONF_VALUE *cval;
int i;
OSSL_TRACE1(CONF, "Loading providers module: section %s\n",
CONF_imodule_get_value(md));
/* Value is a section containing PROVIDERs to configure */
elist = NCONF_get_section(cnf, CONF_imodule_get_value(md));
if (!elist) {
CRYPTOerr(CRYPTO_F_PROVIDER_CONF_INIT,
CRYPTO_R_PROVIDER_SECTION_ERROR);
return 0;
}
for (i = 0; i < sk_CONF_VALUE_num(elist); i++) {
cval = sk_CONF_VALUE_value(elist, i);
if (!provider_conf_load(cnf->libctx, cval->name, cval->value, cnf))
return 0;
}
return 1;
}
static void provider_conf_deinit(CONF_IMODULE *md)
{
sk_OSSL_PROVIDER_pop_free(activated_providers, ossl_provider_free);
activated_providers = NULL;
OSSL_TRACE(CONF, "Cleaned up providers\n");
}
void ossl_provider_add_conf_module(void)
{
OSSL_TRACE(CONF, "Adding config module 'providers'\n");
CONF_module_add("providers", provider_conf_init, provider_conf_deinit);
}
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