/* * Copyright 2019 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 #include #include #include #include "internal/cryptlib.h" #include "internal/thread_once.h" #include "internal/property.h" #include "internal/core.h" #include "internal/namemap.h" #include "internal/evp_int.h" /* evp_locl.h needs it */ #include "evp_locl.h" static void default_method_store_free(void *vstore) { ossl_method_store_free(vstore); } static void *default_method_store_new(OPENSSL_CTX *ctx) { return ossl_method_store_new(ctx); } static const OPENSSL_CTX_METHOD default_method_store_method = { default_method_store_new, default_method_store_free, }; /* Data to be passed through ossl_method_construct() */ struct method_data_st { OPENSSL_CTX *libctx; const char *name; OSSL_METHOD_CONSTRUCT_METHOD *mcm; void *(*method_from_dispatch)(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_method_store(OPENSSL_CTX *ctx) { return ossl_method_store_new(ctx); } static void dealloc_tmp_method_store(void *store) { if (store != NULL) ossl_method_store_free(store); } static OSSL_METHOD_STORE *get_default_method_store(OPENSSL_CTX *libctx) { return openssl_ctx_get_data(libctx, OPENSSL_CTX_DEFAULT_METHOD_STORE_INDEX, &default_method_store_method); } /* * To identity the method in the method store, we mix the name identity * with the operation identity, with 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 method_id(unsigned int operation_id, unsigned int name_id) { if (!ossl_assert(name_id < (1 << 24) || operation_id < (1 << 8)) || !ossl_assert(name_id > 0 && operation_id > 0)) return 0; return ((name_id << 8) & 0xFFFFFF00) | (operation_id & 0x000000FF); } static void *get_method_from_store(OPENSSL_CTX *libctx, void *store, int operation_id, const char *name, const char *propquery, void *data) { struct method_data_st *methdata = data; void *method = NULL; OSSL_NAMEMAP *namemap; int nameid; uint32_t methid; if (store == NULL && (store = get_default_method_store(libctx)) == NULL) return NULL; if ((namemap = ossl_namemap_stored(libctx)) == NULL || (nameid = ossl_namemap_add(namemap, name)) == 0 || (methid = method_id(operation_id, nameid)) == 0) return NULL; (void)ossl_method_store_fetch(store, methid, propquery, &method); if (method != NULL && !methdata->refcnt_up_method(method)) { method = NULL; } return method; } static int put_method_in_store(OPENSSL_CTX *libctx, void *store, void *method, int operation_id, const char *name, const char *propdef, void *data) { struct method_data_st *methdata = data; OSSL_NAMEMAP *namemap; int nameid; uint32_t methid; if ((namemap = ossl_namemap_stored(methdata->libctx)) == NULL || (nameid = ossl_namemap_add(namemap, name)) == 0 || (methid = method_id(operation_id, nameid)) == 0) return 0; if (store == NULL && (store = get_default_method_store(libctx)) == NULL) return 0; if (methdata->refcnt_up_method(method) && ossl_method_store_add(store, methid, propdef, method, methdata->destruct_method)) return 1; return 0; } static void *construct_method(const char *name, const OSSL_DISPATCH *fns, OSSL_PROVIDER *prov, void *data) { struct method_data_st *methdata = data; return methdata->method_from_dispatch(fns, prov); } static void destruct_method(void *method, void *data) { struct method_data_st *methdata = data; methdata->destruct_method(method); } void *evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id, const char *name, const char *properties, void *(*new_method)(const OSSL_DISPATCH *fns, OSSL_PROVIDER *prov), int (*upref_method)(void *), void (*free_method)(void *)) { OSSL_METHOD_STORE *store = get_default_method_store(libctx); OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx); int nameid = 0; uint32_t methid = 0; void *method = NULL; if (store == NULL || namemap == NULL) return NULL; /* * If there's ever an operation_id == 0 passed, we have an internal * programming error. */ if (!ossl_assert(operation_id > 0)) return NULL; /* * 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. */ if ((nameid = ossl_namemap_number(namemap, name)) != 0 && (methid = method_id(operation_id, nameid)) == 0) return NULL; if (nameid == 0 || !ossl_method_store_cache_get(store, methid, properties, &method)) { OSSL_METHOD_CONSTRUCT_METHOD mcm = { alloc_tmp_method_store, dealloc_tmp_method_store, get_method_from_store, put_method_in_store, construct_method, destruct_method }; struct method_data_st mcmdata; mcmdata.mcm = &mcm; mcmdata.libctx = libctx; mcmdata.name = name; mcmdata.method_from_dispatch = new_method; mcmdata.destruct_method = free_method; mcmdata.refcnt_up_method = upref_method; mcmdata.destruct_method = free_method; if ((method = ossl_method_construct(libctx, operation_id, name, properties, 0 /* !force_cache */, &mcm, &mcmdata)) == NULL) { /* * If construction did create a method for us, we know that * there is a correct nameid and methodid, since those have * already been calculated in get_method_from_store() and * put_method_in_store() above. */ nameid = ossl_namemap_number(namemap, name); methid = method_id(operation_id, nameid); ossl_method_store_cache_set(store, methid, properties, method); } } else { upref_method(method); } return method; } int EVP_set_default_properties(OPENSSL_CTX *libctx, const char *propq) { OSSL_METHOD_STORE *store = get_default_method_store(libctx); if (store != NULL) return ossl_method_store_set_global_properties(store, propq); EVPerr(EVP_F_EVP_SET_DEFAULT_PROPERTIES, ERR_R_INTERNAL_ERROR); return 0; }