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openssl/crypto/encode_decode/encoder_meth.c
Richard Levitte cd861ab73d ENCODER: Add support for OSSL_FUNC_encoder_does_selection() 
OSSL_FUNC_encoder_does_selection() is a dispatchable encoder implementation
function that should return 1 if the given |selection| is supported by an
encoder implementation and 0 if not.  This can be used by libcrypto
functionality to figure out if an encoder implementation should be
considered or not.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/13167)
2020-11-11 12:43:27 +01:00

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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 <openssl/core.h>
#include <openssl/core_dispatch.h>
#include <openssl/encoder.h>
#include <openssl/ui.h>
#include "internal/core.h"
#include "internal/namemap.h"
#include "internal/property.h"
#include "internal/provider.h"
#include "crypto/encoder.h"
#include "encoder_local.h"
/*
* Encoder can have multiple names, separated with colons in a name string
*/
#define NAME_SEPARATOR ':'
/* Simple method structure constructor and destructor */
static OSSL_ENCODER *ossl_encoder_new(void)
{
OSSL_ENCODER *encoder = NULL;
if ((encoder = OPENSSL_zalloc(sizeof(*encoder))) == NULL
|| (encoder->base.lock = CRYPTO_THREAD_lock_new()) == NULL) {
OSSL_ENCODER_free(encoder);
ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_MALLOC_FAILURE);
return NULL;
}
encoder->base.refcnt = 1;
return encoder;
}
int OSSL_ENCODER_up_ref(OSSL_ENCODER *encoder)
{
int ref = 0;
CRYPTO_UP_REF(&encoder->base.refcnt, &ref, encoder->base.lock);
return 1;
}
void OSSL_ENCODER_free(OSSL_ENCODER *encoder)
{
int ref = 0;
if (encoder == NULL)
return;
CRYPTO_DOWN_REF(&encoder->base.refcnt, &ref, encoder->base.lock);
if (ref > 0)
return;
ossl_provider_free(encoder->base.prov);
CRYPTO_THREAD_lock_free(encoder->base.lock);
OPENSSL_free(encoder);
}
/* Permanent encoder method store, constructor and destructor */
static void encoder_store_free(void *vstore)
{
ossl_method_store_free(vstore);
}
static void *encoder_store_new(OSSL_LIB_CTX *ctx)
{
return ossl_method_store_new(ctx);
}
static const OSSL_LIB_CTX_METHOD encoder_store_method = {
encoder_store_new,
encoder_store_free,
};
/* Data to be passed through ossl_method_construct() */
struct encoder_data_st {
OSSL_LIB_CTX *libctx;
OSSL_METHOD_CONSTRUCT_METHOD *mcm;
int id; /* For get_encoder_from_store() */
const char *names; /* For get_encoder_from_store() */
const char *propquery; /* For get_encoder_from_store() */
};
/*
* Generic routines to fetch / create ENCODER methods with
* ossl_method_construct()
*/
/* Temporary encoder method store, constructor and destructor */
static void *alloc_tmp_encoder_store(OSSL_LIB_CTX *ctx)
{
return ossl_method_store_new(ctx);
}
static void dealloc_tmp_encoder_store(void *store)
{
if (store != NULL)
ossl_method_store_free(store);
}
/* Get the permanent encoder store */
static OSSL_METHOD_STORE *get_encoder_store(OSSL_LIB_CTX *libctx)
{
return ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_ENCODER_STORE_INDEX,
&encoder_store_method);
}
/* Get encoder methods from a store, or put one in */
static void *get_encoder_from_store(OSSL_LIB_CTX *libctx, void *store,
void *data)
{
struct encoder_data_st *methdata = data;
void *method = NULL;
int id;
if ((id = methdata->id) == 0) {
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
id = ossl_namemap_name2num(namemap, methdata->names);
}
if (store == NULL
&& (store = get_encoder_store(libctx)) == NULL)
return NULL;
if (!ossl_method_store_fetch(store, id, methdata->propquery, &method))
return NULL;
return method;
}
static int put_encoder_in_store(OSSL_LIB_CTX *libctx, void *store,
void *method, const OSSL_PROVIDER *prov,
int operation_id, const char *names,
const char *propdef, void *unused)
{
OSSL_NAMEMAP *namemap;
int id;
if ((namemap = ossl_namemap_stored(libctx)) == NULL
|| (id = ossl_namemap_name2num(namemap, names)) == 0)
return 0;
if (store == NULL && (store = get_encoder_store(libctx)) == NULL)
return 0;
return ossl_method_store_add(store, prov, id, propdef, method,
(int (*)(void *))OSSL_ENCODER_up_ref,
(void (*)(void *))OSSL_ENCODER_free);
}
/* Create and populate a encoder method */
static void *encoder_from_dispatch(int id, const OSSL_ALGORITHM *algodef,
OSSL_PROVIDER *prov)
{
OSSL_ENCODER *encoder = NULL;
const OSSL_DISPATCH *fns = algodef->implementation;
if ((encoder = ossl_encoder_new()) == NULL)
return NULL;
encoder->base.id = id;
encoder->base.propdef = algodef->property_definition;
for (; fns->function_id != 0; fns++) {
switch (fns->function_id) {
case OSSL_FUNC_ENCODER_NEWCTX:
if (encoder->newctx == NULL)
encoder->newctx =
OSSL_FUNC_encoder_newctx(fns);
break;
case OSSL_FUNC_ENCODER_FREECTX:
if (encoder->freectx == NULL)
encoder->freectx =
OSSL_FUNC_encoder_freectx(fns);
break;
case OSSL_FUNC_ENCODER_GET_PARAMS:
if (encoder->get_params == NULL)
encoder->get_params =
OSSL_FUNC_encoder_get_params(fns);
break;
case OSSL_FUNC_ENCODER_GETTABLE_PARAMS:
if (encoder->gettable_params == NULL)
encoder->gettable_params =
OSSL_FUNC_encoder_gettable_params(fns);
break;
case OSSL_FUNC_ENCODER_SET_CTX_PARAMS:
if (encoder->set_ctx_params == NULL)
encoder->set_ctx_params =
OSSL_FUNC_encoder_set_ctx_params(fns);
break;
case OSSL_FUNC_ENCODER_SETTABLE_CTX_PARAMS:
if (encoder->settable_ctx_params == NULL)
encoder->settable_ctx_params =
OSSL_FUNC_encoder_settable_ctx_params(fns);
break;
case OSSL_FUNC_ENCODER_DOES_SELECTION:
if (encoder->does_selection == NULL)
encoder->does_selection =
OSSL_FUNC_encoder_does_selection(fns);
break;
case OSSL_FUNC_ENCODER_ENCODE:
if (encoder->encode == NULL)
encoder->encode = OSSL_FUNC_encoder_encode(fns);
break;
case OSSL_FUNC_ENCODER_IMPORT_OBJECT:
if (encoder->import_object == NULL)
encoder->import_object =
OSSL_FUNC_encoder_import_object(fns);
break;
case OSSL_FUNC_ENCODER_FREE_OBJECT:
if (encoder->free_object == NULL)
encoder->free_object =
OSSL_FUNC_encoder_free_object(fns);
break;
}
}
/*
* Try to check that the method is sensible.
* If you have a constructor, you must have a destructor and vice versa.
* You must have the encoding driver functions.
*/
if (!((encoder->newctx == NULL && encoder->freectx == NULL)
|| (encoder->newctx != NULL && encoder->freectx != NULL)
|| (encoder->import_object != NULL && encoder->free_object != NULL)
|| (encoder->import_object == NULL && encoder->free_object == NULL))
|| encoder->encode == NULL
|| encoder->gettable_params == NULL
|| encoder->get_params == NULL) {
OSSL_ENCODER_free(encoder);
ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_INVALID_PROVIDER_FUNCTIONS);
return NULL;
}
if (prov != NULL && !ossl_provider_up_ref(prov)) {
OSSL_ENCODER_free(encoder);
return NULL;
}
encoder->base.prov = prov;
return encoder;
}
/*
* The core fetching functionality passes the names of the implementation.
* This function is responsible to getting an identity number for them,
* then call encoder_from_dispatch() with that identity number.
*/
static void *construct_encoder(const OSSL_ALGORITHM *algodef,
OSSL_PROVIDER *prov, void *unused)
{
/*
* This function is only called if get_encoder_from_store() returned
* NULL, so it's safe to say that of all the spots to create a new
* namemap entry, this is it. Should the name already exist there, we
* know that ossl_namemap_add() will return its corresponding number.
*/
OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
const char *names = algodef->algorithm_names;
int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
void *method = NULL;
if (id != 0)
method = encoder_from_dispatch(id, algodef, prov);
return method;
}
/* Intermediary function to avoid ugly casts, used below */
static void destruct_encoder(void *method, void *data)
{
OSSL_ENCODER_free(method);
}
static int up_ref_encoder(void *method)
{
return OSSL_ENCODER_up_ref(method);
}
static void free_encoder(void *method)
{
OSSL_ENCODER_free(method);
}
/* Fetching support. Can fetch by numeric identity or by name */
static OSSL_ENCODER *inner_ossl_encoder_fetch(OSSL_LIB_CTX *libctx,
int id, const char *name,
const char *properties)
{
OSSL_METHOD_STORE *store = get_encoder_store(libctx);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
void *method = NULL;
if (store == NULL || namemap == NULL)
return NULL;
/*
* If we have been passed neither a name_id or a name, we have an
* internal programming error.
*/
if (!ossl_assert(id != 0 || name != NULL))
return NULL;
if (id == 0)
id = ossl_namemap_name2num(namemap, name);
if (id == 0
|| !ossl_method_store_cache_get(store, id, properties, &method)) {
OSSL_METHOD_CONSTRUCT_METHOD mcm = {
alloc_tmp_encoder_store,
dealloc_tmp_encoder_store,
get_encoder_from_store,
put_encoder_in_store,
construct_encoder,
destruct_encoder
};
struct encoder_data_st mcmdata;
mcmdata.libctx = libctx;
mcmdata.mcm = &mcm;
mcmdata.id = id;
mcmdata.names = name;
mcmdata.propquery = properties;
if ((method = ossl_method_construct(libctx, OSSL_OP_ENCODER,
0 /* !force_cache */,
&mcm, &mcmdata)) != NULL) {
/*
* If construction did create a method for us, we know that
* there is a correct name_id and meth_id, since those have
* already been calculated in get_encoder_from_store() and
* put_encoder_in_store() above.
*/
if (id == 0)
id = ossl_namemap_name2num(namemap, name);
ossl_method_store_cache_set(store, id, properties, method,
up_ref_encoder, free_encoder);
}
}
return method;
}
OSSL_ENCODER *OSSL_ENCODER_fetch(OSSL_LIB_CTX *libctx, const char *name,
const char *properties)
{
return inner_ossl_encoder_fetch(libctx, 0, name, properties);
}
OSSL_ENCODER *ossl_encoder_fetch_by_number(OSSL_LIB_CTX *libctx, int id,
const char *properties)
{
return inner_ossl_encoder_fetch(libctx, id, NULL, properties);
}
/*
* Library of basic method functions
*/
const OSSL_PROVIDER *OSSL_ENCODER_provider(const OSSL_ENCODER *encoder)
{
if (!ossl_assert(encoder != NULL)) {
ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
return encoder->base.prov;
}
const char *OSSL_ENCODER_properties(const OSSL_ENCODER *encoder)
{
if (!ossl_assert(encoder != NULL)) {
ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
return encoder->base.propdef;
}
int OSSL_ENCODER_number(const OSSL_ENCODER *encoder)
{
if (!ossl_assert(encoder != NULL)) {
ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
return encoder->base.id;
}
int OSSL_ENCODER_is_a(const OSSL_ENCODER *encoder, const char *name)
{
if (encoder->base.prov != NULL) {
OSSL_LIB_CTX *libctx = ossl_provider_libctx(encoder->base.prov);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
return ossl_namemap_name2num(namemap, name) == encoder->base.id;
}
return 0;
}
struct encoder_do_all_data_st {
void (*user_fn)(void *method, void *arg);
void *user_arg;
};
static void encoder_do_one(OSSL_PROVIDER *provider,
const OSSL_ALGORITHM *algodef,
int no_store, void *vdata)
{
struct encoder_do_all_data_st *data = vdata;
OSSL_LIB_CTX *libctx = ossl_provider_libctx(provider);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
const char *names = algodef->algorithm_names;
int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
void *method = NULL;
if (id != 0)
method =
encoder_from_dispatch(id, algodef, provider);
if (method != NULL) {
data->user_fn(method, data->user_arg);
OSSL_ENCODER_free(method);
}
}
void OSSL_ENCODER_do_all_provided(OSSL_LIB_CTX *libctx,
void (*fn)(OSSL_ENCODER *encoder, void *arg),
void *arg)
{
struct encoder_do_all_data_st data;
data.user_fn = (void (*)(void *, void *))fn;
data.user_arg = arg;
/*
* No pre- or post-condition for this call, as this only creates methods
* temporarly and then promptly destroys them.
*/
ossl_algorithm_do_all(libctx, OSSL_OP_ENCODER, NULL, NULL,
encoder_do_one, NULL, &data);
}
void OSSL_ENCODER_names_do_all(const OSSL_ENCODER *encoder,
void (*fn)(const char *name, void *data),
void *data)
{
if (encoder == NULL)
return;
if (encoder->base.prov != NULL) {
OSSL_LIB_CTX *libctx = ossl_provider_libctx(encoder->base.prov);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
ossl_namemap_doall_names(namemap, encoder->base.id, fn, data);
}
}
const OSSL_PARAM *
OSSL_ENCODER_gettable_params(OSSL_ENCODER *encoder)
{
if (encoder != NULL && encoder->gettable_params != NULL) {
void *provctx = ossl_provider_ctx(OSSL_ENCODER_provider(encoder));
return encoder->gettable_params(provctx);
}
return NULL;
}
int OSSL_ENCODER_get_params(OSSL_ENCODER *encoder, OSSL_PARAM params[])
{
if (encoder != NULL && encoder->get_params != NULL)
return encoder->get_params(params);
return 0;
}
const OSSL_PARAM *OSSL_ENCODER_settable_ctx_params(OSSL_ENCODER *encoder)
{
if (encoder != NULL && encoder->settable_ctx_params != NULL) {
void *provctx = ossl_provider_ctx(OSSL_ENCODER_provider(encoder));
return encoder->settable_ctx_params(provctx);
}
return NULL;
}
/*
* Encoder context support
*/
OSSL_ENCODER_CTX *OSSL_ENCODER_CTX_new(void)
{
OSSL_ENCODER_CTX *ctx;
if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_MALLOC_FAILURE);
return ctx;
}
int OSSL_ENCODER_CTX_set_params(OSSL_ENCODER_CTX *ctx,
const OSSL_PARAM params[])
{
int ok = 1;
size_t i;
size_t l;
if (!ossl_assert(ctx != NULL)) {
ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (ctx->encoder_insts == NULL)
return 1;
l = OSSL_ENCODER_CTX_get_num_encoders(ctx);
for (i = 0; i < l; i++) {
OSSL_ENCODER_INSTANCE *encoder_inst =
sk_OSSL_ENCODER_INSTANCE_value(ctx->encoder_insts, i);
OSSL_ENCODER *encoder = OSSL_ENCODER_INSTANCE_get_encoder(encoder_inst);
void *encoderctx = OSSL_ENCODER_INSTANCE_get_encoder_ctx(encoder_inst);
if (encoderctx == NULL || encoder->set_ctx_params == NULL)
continue;
if (!encoder->set_ctx_params(encoderctx, params))
ok = 0;
}
return ok;
}
void OSSL_ENCODER_CTX_free(OSSL_ENCODER_CTX *ctx)
{
if (ctx != NULL) {
sk_OSSL_ENCODER_INSTANCE_pop_free(ctx->encoder_insts,
ossl_encoder_instance_free);
OPENSSL_free(ctx->construct_data);
ossl_pw_clear_passphrase_data(&ctx->pwdata);
OPENSSL_free(ctx);
}
}
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