evp_fetch.c
/*
* 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 <stddef.h>
#include <openssl/types.h>
#include <openssl/evp.h>
#include <openssl/core.h>
#include "internal/cryptlib.h"
#include "internal/thread_once.h"
#include "internal/property.h"
#include "internal/core.h"
#include "internal/provider.h"
#include "internal/namemap.h"
#include "internal/property.h"
#include "crypto/evp.h" /* evp_local.h needs it */
#include "evp_local.h"
#define NAME_SEPARATOR ':'
static void evp_method_store_free(void *vstore)
{
ossl_method_store_free(vstore);
}
static void *evp_method_store_new(OSSL_LIB_CTX *ctx)
{
return ossl_method_store_new(ctx);
}
static const OSSL_LIB_CTX_METHOD evp_method_store_method = {
evp_method_store_new,
evp_method_store_free,
};
/* Data to be passed through ossl_method_construct() */
struct evp_method_data_st {
OSSL_LIB_CTX *libctx;
OSSL_METHOD_CONSTRUCT_METHOD *mcm;
int operation_id; /* For get_evp_method_from_store() */
int name_id; /* For get_evp_method_from_store() */
const char *names; /* For get_evp_method_from_store() */
const char *propquery; /* For get_evp_method_from_store() */
unsigned int flag_construct_error_occured : 1;
void *(*method_from_dispatch)(int name_id, const OSSL_DISPATCH *,
OSSL_PROVIDER *);
int (*refcnt_up_method)(void *method);
void (*destruct_method)(void *method);
};
/*
* Generic routines to fetch / create EVP methods with ossl_method_construct()
*/
static void *alloc_tmp_evp_method_store(OSSL_LIB_CTX *ctx)
{
return ossl_method_store_new(ctx);
}
static void dealloc_tmp_evp_method_store(void *store)
{
if (store != NULL)
ossl_method_store_free(store);
}
static OSSL_METHOD_STORE *get_evp_method_store(OSSL_LIB_CTX *libctx)
{
return ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_EVP_METHOD_STORE_INDEX,
&evp_method_store_method);
}
/*
* To identify the method in the EVP method store, we mix the name identity
* with the operation identity, under the assumption that we don't have more
* than 2^24 names or more than 2^8 operation types.
*
* The resulting identity is a 32-bit integer, composed like this:
*
* +---------24 bits--------+-8 bits-+
* | name identity | op id |
* +------------------------+--------+
*/
static uint32_t evp_method_id(int name_id, unsigned int operation_id)
{
if (!ossl_assert(name_id > 0 && name_id < (1 << 24))
|| !ossl_assert(operation_id > 0 && operation_id < (1 << 8)))
return 0;
return ((name_id << 8) & 0xFFFFFF00) | (operation_id & 0x000000FF);
}
static void *get_evp_method_from_store(OSSL_LIB_CTX *libctx, void *store,
void *data)
{
struct evp_method_data_st *methdata = data;
void *method = NULL;
int name_id;
uint32_t meth_id;
/*
* get_evp_method_from_store() is only called to try and get the method
* that evp_generic_fetch() is asking for, and the operation id as well
* as the name or name id are passed via methdata.
*/
if ((name_id = methdata->name_id) == 0) {
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
const char *names = methdata->names;
const char *q = strchr(names, NAME_SEPARATOR);
size_t l = (q == NULL ? strlen(names) : (size_t)(q - names));
if (namemap == 0)
return NULL;
name_id = ossl_namemap_name2num_n(namemap, names, l);
}
if (name_id == 0
|| (meth_id = evp_method_id(name_id, methdata->operation_id)) == 0)
return NULL;
if (store == NULL
&& (store = get_evp_method_store(libctx)) == NULL)
return NULL;
if (!ossl_method_store_fetch(store, meth_id, methdata->propquery,
&method))
return NULL;
return method;
}
static int put_evp_method_in_store(OSSL_LIB_CTX *libctx, void *store,
void *method, const OSSL_PROVIDER *prov,
int operation_id, const char *names,
const char *propdef, void *data)
{
struct evp_method_data_st *methdata = data;
OSSL_NAMEMAP *namemap;
int name_id;
uint32_t meth_id;
size_t l = 0;
/*
* put_evp_method_in_store() is only called with an EVP method that was
* successfully created by construct_method() below, which means that
* all the names should already be stored in the namemap with the same
* numeric identity, so just use the first to get that identity.
*/
if (names != NULL) {
const char *q = strchr(names, NAME_SEPARATOR);
l = (q == NULL ? strlen(names) : (size_t)(q - names));
}
if ((namemap = ossl_namemap_stored(libctx)) == NULL
|| (name_id = ossl_namemap_name2num_n(namemap, names, l)) == 0
|| (meth_id = evp_method_id(name_id, operation_id)) == 0)
return 0;
if (store == NULL
&& (store = get_evp_method_store(libctx)) == NULL)
return 0;
return ossl_method_store_add(store, prov, meth_id, propdef, method,
methdata->refcnt_up_method,
methdata->destruct_method);
}
/*
* The core fetching functionality passes the name of the implementation.
* This function is responsible to getting an identity number for it.
*/
static void *construct_evp_method(const OSSL_ALGORITHM *algodef,
OSSL_PROVIDER *prov, void *data)
{
/*
* This function is only called if get_evp_method_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_name() will return its corresponding
* number.
*/
struct evp_method_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 name_id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
void *method;
if (name_id == 0)
return NULL;
method = methdata->method_from_dispatch(name_id, algodef->implementation,
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;
}
static void destruct_evp_method(void *method, void *data)
{
struct evp_method_data_st *methdata = data;
methdata->destruct_method(method);
}
static const char *libctx_descriptor(OSSL_LIB_CTX *libctx)
{
#ifdef FIPS_MODULE
return "FIPS internal library context";
#else
if (ossl_lib_ctx_is_global_default(libctx))
return "Global default library context";
if (ossl_lib_ctx_is_default(libctx))
return "Thread-local default library context";
return "Non-default library context";
#endif
}
static void *
inner_evp_generic_fetch(OSSL_LIB_CTX *libctx, int operation_id,
int name_id, const char *name,
const char *properties,
void *(*new_method)(int name_id,
const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
int (*up_ref_method)(void *),
void (*free_method)(void *))
{
OSSL_METHOD_STORE *store = get_evp_method_store(libctx);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
uint32_t meth_id = 0;
void *method = NULL;
int unsupported = 0;
if (store == NULL || namemap == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
return NULL;
}
/*
* If there's ever an operation_id == 0 passed, we have an internal
* programming error.
*/
if (!ossl_assert(operation_id > 0)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
return NULL;
}
/*
* If we have been passed neither a name_id or a name, we have an
* internal programming error.
*/
if (!ossl_assert(name_id != 0 || name != NULL)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
return NULL;
}
/* If we haven't received a name id yet, try to get one for the name */
if (name_id == 0)
name_id = ossl_namemap_name2num(namemap, name);
/*
* If we have a name id, calculate a method id with evp_method_id().
*
* evp_method_id returns 0 if we have too many operations (more than
* about 2^8) or too many names (more than about 2^24). In that case,
* we can't create any new method.
* For all intents and purposes, this is an internal error.
*/
if (name_id != 0 && (meth_id = evp_method_id(name_id, operation_id)) == 0) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
return NULL;
}
/*
* If we haven't found the name yet, chances are that the algorithm to
* be fetched is unsupported.
*/
if (name_id == 0)
unsupported = 1;
if (meth_id == 0
|| !ossl_method_store_cache_get(store, meth_id, properties, &method)) {
OSSL_METHOD_CONSTRUCT_METHOD mcm = {
alloc_tmp_evp_method_store,
dealloc_tmp_evp_method_store,
get_evp_method_from_store,
put_evp_method_in_store,
construct_evp_method,
destruct_evp_method
};
struct evp_method_data_st mcmdata;
mcmdata.mcm = &mcm;
mcmdata.libctx = libctx;
mcmdata.operation_id = operation_id;
mcmdata.name_id = name_id;
mcmdata.names = name;
mcmdata.propquery = properties;
mcmdata.method_from_dispatch = new_method;
mcmdata.refcnt_up_method = up_ref_method;
mcmdata.destruct_method = free_method;
mcmdata.flag_construct_error_occured = 0;
if ((method = ossl_method_construct(libctx, operation_id,
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_evp_method_from_store() and
* put_evp_method_in_store() above.
*/
if (name_id == 0)
name_id = ossl_namemap_name2num(namemap, name);
meth_id = evp_method_id(name_id, operation_id);
ossl_method_store_cache_set(store, meth_id, properties, method,
up_ref_method, free_method);
}
/*
* 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 ? EVP_R_UNSUPPORTED_ALGORITHM : EVP_R_FETCH_FAILED;
if (name == NULL)
name = ossl_namemap_num2name(namemap, name_id, 0);
ERR_raise_data(ERR_LIB_EVP, code,
"%s, Algorithm (%s : %d), Properties (%s)",
libctx_descriptor(libctx),
name = NULL ? "<null>" : name, name_id,
properties == NULL ? "<null>" : properties);
}
return method;
}
void *evp_generic_fetch(OSSL_LIB_CTX *libctx, int operation_id,
const char *name, const char *properties,
void *(*new_method)(int name_id,
const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
int (*up_ref_method)(void *),
void (*free_method)(void *))
{
return inner_evp_generic_fetch(libctx,
operation_id, 0, name, properties,
new_method, up_ref_method, free_method);
}
/*
* evp_generic_fetch_by_number() is special, and only returns methods for
* already known names, i.e. it refuses to work if no name_id can be found
* (it's considered an internal programming error).
* This is meant to be used when one method needs to fetch an associated
* other method.
*/
void *evp_generic_fetch_by_number(OSSL_LIB_CTX *libctx, int operation_id,
int name_id, const char *properties,
void *(*new_method)(int name_id,
const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
int (*up_ref_method)(void *),
void (*free_method)(void *))
{
return inner_evp_generic_fetch(libctx,
operation_id, name_id, NULL,
properties, new_method, up_ref_method,
free_method);
}
void evp_method_store_flush(OSSL_LIB_CTX *libctx)
{
OSSL_METHOD_STORE *store = get_evp_method_store(libctx);
if (store != NULL)
ossl_method_store_flush_cache(store, 1);
}
static int evp_set_parsed_default_properties(OSSL_LIB_CTX *libctx,
OSSL_PROPERTY_LIST *def_prop,
int loadconfig)
{
OSSL_METHOD_STORE *store = get_evp_method_store(libctx);
OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx, loadconfig);
if (plp != NULL) {
ossl_property_free(*plp);
*plp = def_prop;
if (store != NULL)
ossl_method_store_flush_cache(store, 0);
return 1;
}
EVPerr(0, ERR_R_INTERNAL_ERROR);
return 0;
}
int evp_set_default_properties_int(OSSL_LIB_CTX *libctx, const char *propq,
int loadconfig)
{
OSSL_PROPERTY_LIST *pl = NULL;
if (propq != NULL && (pl = ossl_parse_query(libctx, propq)) == NULL) {
EVPerr(0, EVP_R_DEFAULT_QUERY_PARSE_ERROR);
return 0;
}
return evp_set_parsed_default_properties(libctx, pl, loadconfig);
}
int EVP_set_default_properties(OSSL_LIB_CTX *libctx, const char *propq)
{
return evp_set_default_properties_int(libctx, propq, 1);
}
static int evp_default_properties_merge(OSSL_LIB_CTX *libctx, const char *propq)
{
OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx, 1);
OSSL_PROPERTY_LIST *pl1, *pl2;
if (propq == NULL)
return 1;
if (plp == NULL || *plp == NULL)
return EVP_set_default_properties(libctx, propq);
if ((pl1 = ossl_parse_query(libctx, propq)) == NULL) {
EVPerr(0, EVP_R_DEFAULT_QUERY_PARSE_ERROR);
return 0;
}
pl2 = ossl_property_merge(pl1, *plp);
ossl_property_free(pl1);
if (pl2 == NULL) {
EVPerr(0, ERR_R_MALLOC_FAILURE);
return 0;
}
return evp_set_parsed_default_properties(libctx, pl2, 0);
}
static int evp_default_property_is_enabled(OSSL_LIB_CTX *libctx,
const char *prop_name)
{
OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx, 1);
return plp != NULL && ossl_property_is_enabled(libctx, prop_name, *plp);
}
int EVP_default_properties_is_fips_enabled(OSSL_LIB_CTX *libctx)
{
return evp_default_property_is_enabled(libctx, "fips");
}
int EVP_default_properties_enable_fips(OSSL_LIB_CTX *libctx, int enable)
{
const char *query = (enable != 0) ? "fips=yes" : "-fips";
return evp_default_properties_merge(libctx, query);
}
struct do_all_data_st {
void (*user_fn)(void *method, void *arg);
void *user_arg;
void *(*new_method)(const int name_id, const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov);
void (*free_method)(void *);
};
static void do_one(OSSL_PROVIDER *provider, const OSSL_ALGORITHM *algo,
int no_store, void *vdata)
{
struct do_all_data_st *data = vdata;
OSSL_LIB_CTX *libctx = ossl_provider_libctx(provider);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
int name_id = ossl_namemap_add_names(namemap, 0, algo->algorithm_names,
NAME_SEPARATOR);
void *method = NULL;
if (name_id != 0)
method = data->new_method(name_id, algo->implementation, provider);
if (method != NULL) {
data->user_fn(method, data->user_arg);
data->free_method(method);
}
}
void evp_generic_do_all(OSSL_LIB_CTX *libctx, int operation_id,
void (*user_fn)(void *method, void *arg),
void *user_arg,
void *(*new_method)(int name_id,
const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
void (*free_method)(void *))
{
struct do_all_data_st data;
data.new_method = new_method;
data.free_method = free_method;
data.user_fn = user_fn;
data.user_arg = user_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, operation_id, NULL, NULL, do_one, NULL,
&data);
}
const char *evp_first_name(const OSSL_PROVIDER *prov, int name_id)
{
OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
return ossl_namemap_num2name(namemap, name_id, 0);
}
int evp_is_a(OSSL_PROVIDER *prov, int number,
const char *legacy_name, const char *name)
{
/*
* For a |prov| that is NULL, the library context will be NULL
*/
OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
if (prov == NULL)
number = ossl_namemap_name2num(namemap, legacy_name);
return ossl_namemap_name2num(namemap, name) == number;
}
void evp_names_do_all(OSSL_PROVIDER *prov, int number,
void (*fn)(const char *name, void *data),
void *data)
{
OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
ossl_namemap_doall_names(namemap, number, fn, data);
}
