2 * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include <openssl/types.h>
12 #include <openssl/evp.h>
13 #include <openssl/core.h>
14 #include "internal/cryptlib.h"
15 #include "internal/thread_once.h"
16 #include "internal/property.h"
17 #include "internal/core.h"
18 #include "internal/provider.h"
19 #include "internal/namemap.h"
20 #include "crypto/evp.h" /* evp_local.h needs it */
21 #include "evp_local.h"
23 #define NAME_SEPARATOR ':'
25 static void evp_method_store_free(void *vstore)
27 ossl_method_store_free(vstore);
30 static void *evp_method_store_new(OPENSSL_CTX *ctx)
32 return ossl_method_store_new(ctx);
36 static const OPENSSL_CTX_METHOD evp_method_store_method = {
38 evp_method_store_free,
41 /* Data to be passed through ossl_method_construct() */
42 struct evp_method_data_st {
44 OSSL_METHOD_CONSTRUCT_METHOD *mcm;
45 int operation_id; /* For get_evp_method_from_store() */
46 int name_id; /* For get_evp_method_from_store() */
47 const char *names; /* For get_evp_method_from_store() */
48 const char *propquery; /* For get_evp_method_from_store() */
49 void *(*method_from_dispatch)(int name_id, const OSSL_DISPATCH *,
51 int (*refcnt_up_method)(void *method);
52 void (*destruct_method)(void *method);
55 static int add_names_to_namemap(OSSL_NAMEMAP *namemap,
62 /* Check that we have a namemap and that there is at least one name */
63 if (namemap == NULL) {
64 ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
69 * Check that no name is an empty string, and that all names have at
70 * most one numeric identity together.
72 for (p = names; *p != '\0'; p = (q == NULL ? p + l : q + 1)) {
75 if ((q = strchr(p, NAME_SEPARATOR)) == NULL)
76 l = strlen(p); /* offset to \0 */
78 l = q - p; /* offset to the next separator */
80 this_id = ossl_namemap_name2num_n(namemap, p, l);
82 if (*p == '\0' || *p == NAME_SEPARATOR) {
83 ERR_raise(ERR_LIB_EVP, EVP_R_BAD_ALGORITHM_NAME);
88 else if (this_id != 0 && this_id != id) {
89 ERR_raise_data(ERR_LIB_EVP, EVP_R_CONFLICTING_ALGORITHM_NAME,
90 "\"%.*s\" has an existing different identity %d (from \"%s\")",
91 l, p, this_id, names);
96 /* Now that we have checked, register all names */
97 for (p = names; *p != '\0'; p = (q == NULL ? p + l : q + 1)) {
100 if ((q = strchr(p, NAME_SEPARATOR)) == NULL)
101 l = strlen(p); /* offset to \0 */
103 l = q - p; /* offset to the next separator */
105 this_id = ossl_namemap_add_n(namemap, id, p, l);
108 else if (this_id != id) {
109 ERR_raise_data(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR,
110 "Got id %d when expecting %d", this_id, id);
119 /* Creates an initial namemap with names found in the legacy method db */
120 static void get_legacy_evp_names(const char *main_name, const char *alias,
123 int main_id = ossl_namemap_add(arg, 0, main_name);
126 * We could check that the returned value is the same as main_id,
127 * but since this is a void function, there's no sane way to report
128 * the error. The best we can do is trust ourselve to keep the legacy
129 * method database conflict free.
131 * This registers any alias with the same number as the main name.
132 * Should it be that the current |on| *has* the main name, this is
136 (void)ossl_namemap_add(arg, main_id, alias);
139 static void get_legacy_cipher_names(const OBJ_NAME *on, void *arg)
141 const EVP_CIPHER *cipher = (void *)OBJ_NAME_get(on->name, on->type);
143 get_legacy_evp_names(EVP_CIPHER_name(cipher), on->name, arg);
146 static void get_legacy_md_names(const OBJ_NAME *on, void *arg)
148 const EVP_MD *md = (void *)OBJ_NAME_get(on->name, on->type);
149 /* We don't want the pkey_type names, so we need some extra care */
152 snid = OBJ_sn2nid(on->name);
153 lnid = OBJ_ln2nid(on->name);
154 if (snid != EVP_MD_pkey_type(md) && lnid != EVP_MD_pkey_type(md))
155 get_legacy_evp_names(EVP_MD_name(md), on->name, arg);
157 get_legacy_evp_names(EVP_MD_name(md), NULL, arg);
161 static OSSL_NAMEMAP *get_prepopulated_namemap(OPENSSL_CTX *libctx)
163 OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
166 if (namemap != NULL && ossl_namemap_empty(namemap)) {
167 /* Before pilfering, we make sure the legacy database is populated */
168 OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
169 |OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
171 OBJ_NAME_do_all(OBJ_NAME_TYPE_CIPHER_METH,
172 get_legacy_cipher_names, namemap);
173 OBJ_NAME_do_all(OBJ_NAME_TYPE_MD_METH,
174 get_legacy_md_names, namemap);
182 * Generic routines to fetch / create EVP methods with ossl_method_construct()
184 static void *alloc_tmp_evp_method_store(OPENSSL_CTX *ctx)
186 return ossl_method_store_new(ctx);
189 static void dealloc_tmp_evp_method_store(void *store)
192 ossl_method_store_free(store);
195 static OSSL_METHOD_STORE *get_evp_method_store(OPENSSL_CTX *libctx)
197 return openssl_ctx_get_data(libctx, OPENSSL_CTX_EVP_METHOD_STORE_INDEX,
198 &evp_method_store_method);
202 * To identity the method in the EVP method store, we mix the name identity
203 * with the operation identity, with the assumption that we don't have more
204 * than 2^24 names or more than 2^8 operation types.
206 * The resulting identity is a 32-bit integer, composed like this:
208 * +---------24 bits--------+-8 bits-+
209 * | name identity | op id |
210 * +------------------------+--------+
212 static uint32_t evp_method_id(unsigned int operation_id, int name_id)
214 if (!ossl_assert(name_id < (1 << 24) || operation_id < (1 << 8))
215 || !ossl_assert(name_id > 0 && operation_id > 0))
217 return ((name_id << 8) & 0xFFFFFF00) | (operation_id & 0x000000FF);
220 static void *get_evp_method_from_store(OPENSSL_CTX *libctx, void *store,
223 struct evp_method_data_st *methdata = data;
229 * get_evp_method_from_store() is only called to try and get the method
230 * that evp_generic_fetch() is asking for, and the operation id as well
231 * as the name or name id are passed via methdata.
233 if ((name_id = methdata->name_id) == 0) {
234 OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
235 const char *names = methdata->names;
236 const char *q = strchr(names, NAME_SEPARATOR);
237 size_t l = (q == NULL ? strlen(names) : (size_t)(q - names));
241 name_id = ossl_namemap_name2num_n(namemap, names, l);
245 || (meth_id = evp_method_id(methdata->operation_id, name_id)) == 0)
249 && (store = get_evp_method_store(libctx)) == NULL)
252 if (!ossl_method_store_fetch(store, meth_id, methdata->propquery,
258 static int put_evp_method_in_store(OPENSSL_CTX *libctx, void *store,
259 void *method, const OSSL_PROVIDER *prov,
260 int operation_id, const char *names,
261 const char *propdef, void *data)
263 struct evp_method_data_st *methdata = data;
264 OSSL_NAMEMAP *namemap;
270 * put_evp_method_in_store() is only called with an EVP method that was
271 * successfully created by construct_method() below, which means that
272 * all the names should already be stored in the namemap with the same
273 * numeric identity, so just use the first to get that identity.
276 const char *q = strchr(names, NAME_SEPARATOR);
278 l = (q == NULL ? strlen(names) : (size_t)(q - names));
281 if ((namemap = ossl_namemap_stored(libctx)) == NULL
282 || (name_id = ossl_namemap_name2num_n(namemap, names, l)) == 0
283 || (meth_id = evp_method_id(operation_id, name_id)) == 0)
287 && (store = get_evp_method_store(libctx)) == NULL)
290 return ossl_method_store_add(store, prov, meth_id, propdef, method,
291 methdata->refcnt_up_method,
292 methdata->destruct_method);
296 * The core fetching functionality passes the name of the implementation.
297 * This function is responsible to getting an identity number for it.
299 static void *construct_evp_method(const char *names, const OSSL_DISPATCH *fns,
300 OSSL_PROVIDER *prov, void *data)
303 * This function is only called if get_evp_method_from_store() returned
304 * NULL, so it's safe to say that of all the spots to create a new
305 * namemap entry, this is it. Should the name already exist there, we
306 * know that ossl_namemap_add() will return its corresponding number.
308 struct evp_method_data_st *methdata = data;
309 OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
310 OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
311 int name_id = add_names_to_namemap(namemap, names);
315 return methdata->method_from_dispatch(name_id, fns, prov);
318 static void destruct_evp_method(void *method, void *data)
320 struct evp_method_data_st *methdata = data;
322 methdata->destruct_method(method);
326 inner_evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id,
327 int name_id, const char *name,
328 const char *properties,
329 void *(*new_method)(int name_id,
330 const OSSL_DISPATCH *fns,
331 OSSL_PROVIDER *prov),
332 int (*up_ref_method)(void *),
333 void (*free_method)(void *))
335 OSSL_METHOD_STORE *store = get_evp_method_store(libctx);
336 OSSL_NAMEMAP *namemap = get_prepopulated_namemap(libctx);
337 uint32_t meth_id = 0;
340 if (store == NULL || namemap == NULL)
344 * If there's ever an operation_id == 0 passed, we have an internal
347 if (!ossl_assert(operation_id > 0))
351 * If we have been passed neither a name_id or a name, we have an
352 * internal programming error.
354 if (!ossl_assert(name_id != 0 || name != NULL))
357 /* If we haven't received a name id yet, try to get one for the name */
359 name_id = ossl_namemap_name2num(namemap, name);
362 * If we have a name id, calculate a method id with evp_method_id().
364 * evp_method_id returns 0 if we have too many operations (more than
365 * about 2^8) or too many names (more than about 2^24). In that case,
366 * we can't create any new method.
368 if (name_id != 0 && (meth_id = evp_method_id(operation_id, name_id)) == 0)
372 || !ossl_method_store_cache_get(store, meth_id, properties, &method)) {
373 OSSL_METHOD_CONSTRUCT_METHOD mcm = {
374 alloc_tmp_evp_method_store,
375 dealloc_tmp_evp_method_store,
376 get_evp_method_from_store,
377 put_evp_method_in_store,
378 construct_evp_method,
381 struct evp_method_data_st mcmdata;
384 mcmdata.libctx = libctx;
385 mcmdata.operation_id = operation_id;
386 mcmdata.name_id = name_id;
387 mcmdata.names = name;
388 mcmdata.propquery = properties;
389 mcmdata.method_from_dispatch = new_method;
390 mcmdata.refcnt_up_method = up_ref_method;
391 mcmdata.destruct_method = free_method;
392 if ((method = ossl_method_construct(libctx, operation_id,
393 0 /* !force_cache */,
394 &mcm, &mcmdata)) != NULL) {
396 * If construction did create a method for us, we know that
397 * there is a correct name_id and meth_id, since those have
398 * already been calculated in get_evp_method_from_store() and
399 * put_evp_method_in_store() above.
402 name_id = ossl_namemap_name2num(namemap, name);
403 meth_id = evp_method_id(operation_id, name_id);
404 ossl_method_store_cache_set(store, meth_id, properties, method,
405 up_ref_method, free_method);
412 void *evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id,
413 const char *name, const char *properties,
414 void *(*new_method)(int name_id,
415 const OSSL_DISPATCH *fns,
416 OSSL_PROVIDER *prov),
417 int (*up_ref_method)(void *),
418 void (*free_method)(void *))
420 return inner_evp_generic_fetch(libctx,
421 operation_id, 0, name, properties,
422 new_method, up_ref_method, free_method);
426 * evp_generic_fetch_by_number() is special, and only returns methods for
427 * already known names, i.e. it refuses to work if no name_id can be found
428 * (it's considered an internal programming error).
429 * This is meant to be used when one method needs to fetch an associated
432 void *evp_generic_fetch_by_number(OPENSSL_CTX *libctx, int operation_id,
433 int name_id, const char *properties,
434 void *(*new_method)(int name_id,
435 const OSSL_DISPATCH *fns,
436 OSSL_PROVIDER *prov),
437 int (*up_ref_method)(void *),
438 void (*free_method)(void *))
440 return inner_evp_generic_fetch(libctx,
441 operation_id, name_id, NULL, properties,
442 new_method, up_ref_method, free_method);
445 int EVP_set_default_properties(OPENSSL_CTX *libctx, const char *propq)
447 OSSL_METHOD_STORE *store = get_evp_method_store(libctx);
450 return ossl_method_store_set_global_properties(store, propq);
451 EVPerr(EVP_F_EVP_SET_DEFAULT_PROPERTIES, ERR_R_INTERNAL_ERROR);
455 struct do_all_data_st {
456 void (*user_fn)(void *method, void *arg);
458 void *(*new_method)(const int name_id, const OSSL_DISPATCH *fns,
459 OSSL_PROVIDER *prov);
460 void (*free_method)(void *);
463 static void do_one(OSSL_PROVIDER *provider, const OSSL_ALGORITHM *algo,
464 int no_store, void *vdata)
466 struct do_all_data_st *data = vdata;
467 OPENSSL_CTX *libctx = ossl_provider_library_context(provider);
468 OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
469 int name_id = add_names_to_namemap(namemap, algo->algorithm_names);
473 method = data->new_method(name_id, algo->implementation, provider);
475 if (method != NULL) {
476 data->user_fn(method, data->user_arg);
477 data->free_method(method);
481 void evp_generic_do_all(OPENSSL_CTX *libctx, int operation_id,
482 void (*user_fn)(void *method, void *arg),
484 void *(*new_method)(int name_id,
485 const OSSL_DISPATCH *fns,
486 OSSL_PROVIDER *prov),
487 void (*free_method)(void *))
489 struct do_all_data_st data;
491 data.new_method = new_method;
492 data.free_method = free_method;
493 data.user_fn = user_fn;
494 data.user_arg = user_arg;
495 ossl_algorithm_do_all(libctx, operation_id, NULL, do_one, &data);
498 const char *evp_first_name(OSSL_PROVIDER *prov, int name_id)
500 OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
501 OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
503 return ossl_namemap_num2name(namemap, name_id, 0);
506 int evp_is_a(OSSL_PROVIDER *prov, int number, const char *name)
508 OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
509 OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
511 return ossl_namemap_name2num(namemap, name) == number;
514 void evp_names_do_all(OSSL_PROVIDER *prov, int number,
515 void (*fn)(const char *name, void *data),
518 OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
519 OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
521 ossl_namemap_doall_names(namemap, number, fn, data);