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openssl/crypto/provider_conf.c
Hugo Landau 927d0566de Refactor OSSL_LIB_CTX to avoid using CRYPTO_EX_DATA 
This refactors OSSL_LIB_CTX to avoid using CRYPTO_EX_DATA. The assorted
objects to be managed by OSSL_LIB_CTX are hardcoded and are initialized
eagerly rather than lazily, which avoids the need for locking on access
in most cases.

Fixes #17116.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17881)
2022-04-01 10:49:19 +11:00

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/*
* Copyright 2019-2021 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 <openssl/provider.h>
#include "internal/provider.h"
#include "internal/cryptlib.h"
#include "provider_local.h"
#include "crypto/context.h"
DEFINE_STACK_OF(OSSL_PROVIDER)
/* PROVIDER config module */
typedef struct {
CRYPTO_RWLOCK *lock;
STACK_OF(OSSL_PROVIDER) *activated_providers;
} PROVIDER_CONF_GLOBAL;
void *ossl_prov_conf_ctx_new(OSSL_LIB_CTX *libctx)
{
PROVIDER_CONF_GLOBAL *pcgbl = OPENSSL_zalloc(sizeof(*pcgbl));
if (pcgbl == NULL)
return NULL;
pcgbl->lock = CRYPTO_THREAD_lock_new();
if (pcgbl->lock == NULL) {
OPENSSL_free(pcgbl);
return NULL;
}
return pcgbl;
}
void ossl_prov_conf_ctx_free(void *vpcgbl)
{
PROVIDER_CONF_GLOBAL *pcgbl = vpcgbl;
sk_OSSL_PROVIDER_pop_free(pcgbl->activated_providers,
ossl_provider_free);
OSSL_TRACE(CONF, "Cleaned up providers\n");
CRYPTO_THREAD_lock_free(pcgbl->lock);
OPENSSL_free(pcgbl);
}
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,
OSSL_PROVIDER_INFO *provinfo,
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, provinfo, 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);
if (prov != NULL)
ok = ossl_provider_add_parameter(prov, name, value);
else
ok = ossl_provider_info_add_parameter(provinfo, name, value);
}
return ok;
}
static int prov_already_activated(const char *name,
STACK_OF(OSSL_PROVIDER) *activated)
{
int i, max;
if (activated == NULL)
return 0;
max = sk_OSSL_PROVIDER_num(activated);
for (i = 0; i < max; i++) {
OSSL_PROVIDER *tstprov = sk_OSSL_PROVIDER_value(activated, i);
if (strcmp(OSSL_PROVIDER_get0_name(tstprov), name) == 0) {
return 1;
}
}
return 0;
}
static int provider_conf_activate(OSSL_LIB_CTX *libctx, const char *name,
const char *value, const char *path,
int soft, const CONF *cnf)
{
PROVIDER_CONF_GLOBAL *pcgbl
= ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_PROVIDER_CONF_INDEX);
OSSL_PROVIDER *prov = NULL, *actual = NULL;
int ok = 0;
if (pcgbl == NULL || !CRYPTO_THREAD_write_lock(pcgbl->lock)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
return 0;
}
if (!prov_already_activated(name, pcgbl->activated_providers)) {
/*
* There is an attempt to activate a provider, so we should disable
* loading of fallbacks. Otherwise a misconfiguration could mean the
* intended provider does not get loaded. Subsequent fetches could
* then fallback to the default provider - which may be the wrong
* thing.
*/
if (!ossl_provider_disable_fallback_loading(libctx)) {
CRYPTO_THREAD_unlock(pcgbl->lock);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
return 0;
}
prov = ossl_provider_find(libctx, name, 1);
if (prov == NULL)
prov = ossl_provider_new(libctx, name, NULL, 1);
if (prov == NULL) {
CRYPTO_THREAD_unlock(pcgbl->lock);
if (soft)
ERR_clear_error();
return 0;
}
if (path != NULL)
ossl_provider_set_module_path(prov, path);
ok = provider_conf_params(prov, NULL, NULL, value, cnf);
if (ok) {
if (!ossl_provider_activate(prov, 1, 0)) {
ok = 0;
} else if (!ossl_provider_add_to_store(prov, &actual, 0)) {
ossl_provider_deactivate(prov, 1);
ok = 0;
} else if (actual != prov
&& !ossl_provider_activate(actual, 1, 0)) {
ossl_provider_free(actual);
ok = 0;
} else {
if (pcgbl->activated_providers == NULL)
pcgbl->activated_providers = sk_OSSL_PROVIDER_new_null();
if (pcgbl->activated_providers == NULL
|| !sk_OSSL_PROVIDER_push(pcgbl->activated_providers,
actual)) {
ossl_provider_deactivate(actual, 1);
ossl_provider_free(actual);
ok = 0;
} else {
ok = 1;
}
}
}
if (!ok)
ossl_provider_free(prov);
}
CRYPTO_THREAD_unlock(pcgbl->lock);
return ok;
}
static int provider_conf_load(OSSL_LIB_CTX *libctx, const char *name,
const char *value, const CONF *cnf)
{
int i;
STACK_OF(CONF_VALUE) *ecmds;
int soft = 0;
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) {
ERR_raise_data(ERR_LIB_CRYPTO, CRYPTO_R_PROVIDER_SECTION_ERROR,
"section=%s not found", value);
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;
}
if (activate) {
ok = provider_conf_activate(libctx, name, value, path, soft, cnf);
} else {
OSSL_PROVIDER_INFO entry;
memset(&entry, 0, sizeof(entry));
ok = 1;
if (name != NULL) {
entry.name = OPENSSL_strdup(name);
if (entry.name == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
ok = 0;
}
}
if (ok && path != NULL) {
entry.path = OPENSSL_strdup(path);
if (entry.path == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
ok = 0;
}
}
if (ok)
ok = provider_conf_params(NULL, &entry, NULL, value, cnf);
if (ok && (entry.path != NULL || entry.parameters != NULL))
ok = ossl_provider_info_add_to_store(libctx, &entry);
if (!ok || (entry.path == NULL && entry.parameters == NULL)) {
ossl_provider_info_clear(&entry);
}
}
/*
* Even if ok is 0, we still return success. Failure to load a provider is
* not fatal. We want to continue to load the rest of the config file.
*/
return 1;
}
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) {
ERR_raise(ERR_LIB_CRYPTO, 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(NCONF_get0_libctx((CONF *)cnf),
cval->name, cval->value, cnf))
return 0;
}
return 1;
}
void ossl_provider_add_conf_module(void)
{
OSSL_TRACE(CONF, "Adding config module 'providers'\n");
CONF_module_add("providers", provider_conf_init, NULL);
}
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