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openssl/crypto/encode_decode/decoder_meth.c
Matt Caswell d84f5515fa Don't hold a lock when calling a callback in ossl_namemap_doall_names 
We don't want to hold a read lock when calling a user supplied callback.
That callback could do anything so the risk of a deadlock is high.
Instead we collect all the names first inside the read lock, and then
subsequently call the user callback outside the read lock.

Fixes #14225

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14250)
2021-02-25 08:37:22 +10:00

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/*
* Copyright 2020-2021 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 <openssl/core.h>
#include <openssl/core_dispatch.h>
#include <openssl/decoder.h>
#include <openssl/ui.h>
#include "internal/core.h"
#include "internal/namemap.h"
#include "internal/property.h"
#include "internal/provider.h"
#include "crypto/decoder.h"
#include "encoder_local.h"
/*
* Decoder can have multiple names, separated with colons in a name string
*/
#define NAME_SEPARATOR ':'
/* Simple method structure constructor and destructor */
static OSSL_DECODER *ossl_decoder_new(void)
{
OSSL_DECODER *decoder = NULL;
if ((decoder = OPENSSL_zalloc(sizeof(*decoder))) == NULL
|| (decoder->base.lock = CRYPTO_THREAD_lock_new()) == NULL) {
OSSL_DECODER_free(decoder);
ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_MALLOC_FAILURE);
return NULL;
}
decoder->base.refcnt = 1;
return decoder;
}
int OSSL_DECODER_up_ref(OSSL_DECODER *decoder)
{
int ref = 0;
CRYPTO_UP_REF(&decoder->base.refcnt, &ref, decoder->base.lock);
return 1;
}
void OSSL_DECODER_free(OSSL_DECODER *decoder)
{
int ref = 0;
if (decoder == NULL)
return;
CRYPTO_DOWN_REF(&decoder->base.refcnt, &ref, decoder->base.lock);
if (ref > 0)
return;
ossl_provider_free(decoder->base.prov);
CRYPTO_THREAD_lock_free(decoder->base.lock);
OPENSSL_free(decoder);
}
/* Permanent decoder method store, constructor and destructor */
static void decoder_store_free(void *vstore)
{
ossl_method_store_free(vstore);
}
static void *decoder_store_new(OSSL_LIB_CTX *ctx)
{
return ossl_method_store_new(ctx);
}
static const OSSL_LIB_CTX_METHOD decoder_store_method = {
decoder_store_new,
decoder_store_free,
};
/* Data to be passed through ossl_method_construct() */
struct decoder_data_st {
OSSL_LIB_CTX *libctx;
OSSL_METHOD_CONSTRUCT_METHOD *mcm;
int id; /* For get_decoder_from_store() */
const char *names; /* For get_decoder_from_store() */
const char *propquery; /* For get_decoder_from_store() */
unsigned int flag_construct_error_occured : 1;
};
/*
* Generic routines to fetch / create DECODER methods with
* ossl_method_construct()
*/
/* Temporary decoder method store, constructor and destructor */
static void *alloc_tmp_decoder_store(OSSL_LIB_CTX *ctx)
{
return ossl_method_store_new(ctx);
}
static void dealloc_tmp_decoder_store(void *store)
{
if (store != NULL)
ossl_method_store_free(store);
}
/* Get the permanent decoder store */
static OSSL_METHOD_STORE *get_decoder_store(OSSL_LIB_CTX *libctx)
{
return ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_DECODER_STORE_INDEX,
&decoder_store_method);
}
/* Get decoder methods from a store, or put one in */
static void *get_decoder_from_store(OSSL_LIB_CTX *libctx, void *store,
void *data)
{
struct decoder_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_decoder_store(libctx)) == NULL)
return NULL;
if (!ossl_method_store_fetch(store, id, methdata->propquery, &method))
return NULL;
return method;
}
static int put_decoder_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_decoder_store(libctx)) == NULL)
return 0;
return ossl_method_store_add(store, prov, id, propdef, method,
(int (*)(void *))OSSL_DECODER_up_ref,
(void (*)(void *))OSSL_DECODER_free);
}
/* Create and populate a decoder method */
void *ossl_decoder_from_dispatch(int id, const OSSL_ALGORITHM *algodef,
OSSL_PROVIDER *prov)
{
OSSL_DECODER *decoder = NULL;
const OSSL_DISPATCH *fns = algodef->implementation;
if ((decoder = ossl_decoder_new()) == NULL)
return NULL;
decoder->base.id = id;
decoder->base.propdef = algodef->property_definition;
for (; fns->function_id != 0; fns++) {
switch (fns->function_id) {
case OSSL_FUNC_DECODER_NEWCTX:
if (decoder->newctx == NULL)
decoder->newctx = OSSL_FUNC_decoder_newctx(fns);
break;
case OSSL_FUNC_DECODER_FREECTX:
if (decoder->freectx == NULL)
decoder->freectx = OSSL_FUNC_decoder_freectx(fns);
break;
case OSSL_FUNC_DECODER_GET_PARAMS:
if (decoder->get_params == NULL)
decoder->get_params =
OSSL_FUNC_decoder_get_params(fns);
break;
case OSSL_FUNC_DECODER_GETTABLE_PARAMS:
if (decoder->gettable_params == NULL)
decoder->gettable_params =
OSSL_FUNC_decoder_gettable_params(fns);
break;
case OSSL_FUNC_DECODER_SET_CTX_PARAMS:
if (decoder->set_ctx_params == NULL)
decoder->set_ctx_params =
OSSL_FUNC_decoder_set_ctx_params(fns);
break;
case OSSL_FUNC_DECODER_SETTABLE_CTX_PARAMS:
if (decoder->settable_ctx_params == NULL)
decoder->settable_ctx_params =
OSSL_FUNC_decoder_settable_ctx_params(fns);
break;
case OSSL_FUNC_DECODER_DOES_SELECTION:
if (decoder->does_selection == NULL)
decoder->does_selection =
OSSL_FUNC_decoder_does_selection(fns);
break;
case OSSL_FUNC_DECODER_DECODE:
if (decoder->decode == NULL)
decoder->decode = OSSL_FUNC_decoder_decode(fns);
break;
case OSSL_FUNC_DECODER_EXPORT_OBJECT:
if (decoder->export_object == NULL)
decoder->export_object = OSSL_FUNC_decoder_export_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 at least one of the encoding driver functions.
*/
if (!((decoder->newctx == NULL && decoder->freectx == NULL)
|| (decoder->newctx != NULL && decoder->freectx != NULL))
|| decoder->decode == NULL) {
OSSL_DECODER_free(decoder);
ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_INVALID_PROVIDER_FUNCTIONS);
return NULL;
}
if (prov != NULL && !ossl_provider_up_ref(prov)) {
OSSL_DECODER_free(decoder);
return NULL;
}
decoder->base.prov = prov;
return decoder;
}
/*
* The core fetching functionality passes the names of the implementation.
* This function is responsible to getting an identity number for them,
* then call ossl_decoder_from_dispatch() with that identity number.
*/
static void *construct_decoder(const OSSL_ALGORITHM *algodef,
OSSL_PROVIDER *prov, void *data)
{
/*
* This function is only called if get_decoder_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.
*/
struct decoder_data_st *methdata = data;
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 = ossl_decoder_from_dispatch(id, algodef, prov);
/*
* Flag to indicate that there was actual construction errors. This
* helps inner_evp_generic_fetch() determine what error it should
* record on inaccessible algorithms.
*/
if (method == NULL)
methdata->flag_construct_error_occured = 1;
return method;
}
/* Intermediary function to avoid ugly casts, used below */
static void destruct_decoder(void *method, void *data)
{
OSSL_DECODER_free(method);
}
static int up_ref_decoder(void *method)
{
return OSSL_DECODER_up_ref(method);
}
static void free_decoder(void *method)
{
OSSL_DECODER_free(method);
}
/* Fetching support. Can fetch by numeric identity or by name */
static OSSL_DECODER *inner_ossl_decoder_fetch(OSSL_LIB_CTX *libctx, int id,
const char *name,
const char *properties)
{
OSSL_METHOD_STORE *store = get_decoder_store(libctx);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
void *method = NULL;
int unsupported = 0;
if (store == NULL || namemap == NULL) {
ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_INVALID_ARGUMENT);
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)) {
ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_INTERNAL_ERROR);
return NULL;
}
if (id == 0)
id = ossl_namemap_name2num(namemap, name);
/*
* If we haven't found the name yet, chances are that the algorithm to
* be fetched is unsupported.
*/
if (id == 0)
unsupported = 1;
if (id == 0
|| !ossl_method_store_cache_get(store, id, properties, &method)) {
OSSL_METHOD_CONSTRUCT_METHOD mcm = {
alloc_tmp_decoder_store,
dealloc_tmp_decoder_store,
get_decoder_from_store,
put_decoder_in_store,
construct_decoder,
destruct_decoder
};
struct decoder_data_st mcmdata;
mcmdata.libctx = libctx;
mcmdata.mcm = &mcm;
mcmdata.id = id;
mcmdata.names = name;
mcmdata.propquery = properties;
mcmdata.flag_construct_error_occured = 0;
if ((method = ossl_method_construct(libctx, OSSL_OP_DECODER,
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_decoder_from_store() and
* put_decoder_in_store() above.
*/
if (id == 0)
id = ossl_namemap_name2num(namemap, name);
ossl_method_store_cache_set(store, id, properties, method,
up_ref_decoder, free_decoder);
}
/*
* If we never were in the constructor, the algorithm to be fetched
* is unsupported.
*/
unsupported = !mcmdata.flag_construct_error_occured;
}
if (method == NULL) {
int code = unsupported ? ERR_R_UNSUPPORTED : ERR_R_FETCH_FAILED;
if (name == NULL)
name = ossl_namemap_num2name(namemap, id, 0);
ERR_raise_data(ERR_LIB_OSSL_DECODER, code,
"%s, Name (%s : %d), Properties (%s)",
ossl_lib_ctx_get_descriptor(libctx),
name = NULL ? "<null>" : name, id,
properties == NULL ? "<null>" : properties);
}
return method;
}
OSSL_DECODER *OSSL_DECODER_fetch(OSSL_LIB_CTX *libctx, const char *name,
const char *properties)
{
return inner_ossl_decoder_fetch(libctx, 0, name, properties);
}
OSSL_DECODER *ossl_decoder_fetch_by_number(OSSL_LIB_CTX *libctx, int id,
const char *properties)
{
return inner_ossl_decoder_fetch(libctx, id, NULL, properties);
}
/*
* Library of basic method functions
*/
const OSSL_PROVIDER *OSSL_DECODER_provider(const OSSL_DECODER *decoder)
{
if (!ossl_assert(decoder != NULL)) {
ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
return decoder->base.prov;
}
const char *OSSL_DECODER_properties(const OSSL_DECODER *decoder)
{
if (!ossl_assert(decoder != NULL)) {
ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
return decoder->base.propdef;
}
int OSSL_DECODER_number(const OSSL_DECODER *decoder)
{
if (!ossl_assert(decoder != NULL)) {
ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
return decoder->base.id;
}
int OSSL_DECODER_is_a(const OSSL_DECODER *decoder, const char *name)
{
if (decoder->base.prov != NULL) {
OSSL_LIB_CTX *libctx = ossl_provider_libctx(decoder->base.prov);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
return ossl_namemap_name2num(namemap, name) == decoder->base.id;
}
return 0;
}
struct decoder_do_all_data_st {
void (*user_fn)(void *method, void *arg);
void *user_arg;
};
static void decoder_do_one(OSSL_PROVIDER *provider,
const OSSL_ALGORITHM *algodef,
int no_store, void *vdata)
{
struct decoder_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 = ossl_decoder_from_dispatch(id, algodef, provider);
if (method != NULL) {
data->user_fn(method, data->user_arg);
OSSL_DECODER_free(method);
}
}
void OSSL_DECODER_do_all_provided(OSSL_LIB_CTX *libctx,
void (*fn)(OSSL_DECODER *decoder, void *arg),
void *arg)
{
struct decoder_do_all_data_st data;
data.user_fn = (void (*)(void *, void *))fn;
data.user_arg = arg;
ossl_algorithm_do_all(libctx, OSSL_OP_DECODER, NULL,
NULL, decoder_do_one, NULL,
&data);
}
int OSSL_DECODER_names_do_all(const OSSL_DECODER *decoder,
void (*fn)(const char *name, void *data),
void *data)
{
if (decoder == NULL)
return 0;
if (decoder->base.prov != NULL) {
OSSL_LIB_CTX *libctx = ossl_provider_libctx(decoder->base.prov);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
return ossl_namemap_doall_names(namemap, decoder->base.id, fn, data);
}
return 1;
}
const OSSL_PARAM *
OSSL_DECODER_gettable_params(OSSL_DECODER *decoder)
{
if (decoder != NULL && decoder->gettable_params != NULL) {
void *provctx = ossl_provider_ctx(OSSL_DECODER_provider(decoder));
return decoder->gettable_params(provctx);
}
return NULL;
}
int OSSL_DECODER_get_params(OSSL_DECODER *decoder, OSSL_PARAM params[])
{
if (decoder != NULL && decoder->get_params != NULL)
return decoder->get_params(params);
return 0;
}
const OSSL_PARAM *
OSSL_DECODER_settable_ctx_params(OSSL_DECODER *decoder)
{
if (decoder != NULL && decoder->settable_ctx_params != NULL) {
void *provctx = ossl_provider_ctx(OSSL_DECODER_provider(decoder));
return decoder->settable_ctx_params(provctx);
}
return NULL;
}
/*
* Decoder context support
*/
/*
* |encoder| value NULL is valid, and signifies that there is no decoder.
* This is useful to provide fallback mechanisms.
* Functions that want to verify if there is a decoder can do so with
* OSSL_DECODER_CTX_get_decoder()
*/
OSSL_DECODER_CTX *OSSL_DECODER_CTX_new(void)
{
OSSL_DECODER_CTX *ctx;
if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_MALLOC_FAILURE);
return ctx;
}
int OSSL_DECODER_CTX_set_params(OSSL_DECODER_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_DECODER, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (ctx->decoder_insts == NULL)
return 1;
l = OSSL_DECODER_CTX_get_num_decoders(ctx);
for (i = 0; i < l; i++) {
OSSL_DECODER_INSTANCE *decoder_inst =
sk_OSSL_DECODER_INSTANCE_value(ctx->decoder_insts, i);
OSSL_DECODER *decoder =
OSSL_DECODER_INSTANCE_get_decoder(decoder_inst);
OSSL_DECODER *decoderctx =
OSSL_DECODER_INSTANCE_get_decoder_ctx(decoder_inst);
if (decoderctx == NULL || decoder->set_ctx_params == NULL)
continue;
if (!decoder->set_ctx_params(decoderctx, params))
ok = 0;
}
return ok;
}
void OSSL_DECODER_CTX_free(OSSL_DECODER_CTX *ctx)
{
if (ctx != NULL) {
if (ctx->cleanup != NULL)
ctx->cleanup(ctx->construct_data);
sk_OSSL_DECODER_INSTANCE_pop_free(ctx->decoder_insts,
ossl_decoder_instance_free);
ossl_pw_clear_passphrase_data(&ctx->pwdata);
OPENSSL_free(ctx);
}
}
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