crypto/provider_conf.c - third_party/openssl - Git at Google

 /*
  * 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);
 }
	/*
	* 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);
	}