2 * Copyright 2019-2022 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
10 #include "internal/namemap.h"
11 #include <openssl/lhash.h>
12 #include "crypto/lhash.h" /* ossl_lh_strcasehash */
13 #include "internal/tsan_assist.h"
14 #include "internal/sizes.h"
25 DEFINE_LHASH_OF(NAMENUM_ENTRY);
32 struct ossl_namemap_st {
34 unsigned int stored:1; /* If 1, it's stored in a library context */
37 LHASH_OF(NAMENUM_ENTRY) *namenum; /* Name->number mapping */
39 TSAN_QUALIFIER int max_number; /* Current max number */
44 static unsigned long namenum_hash(const NAMENUM_ENTRY *n)
46 return ossl_lh_strcasehash(n->name);
49 static int namenum_cmp(const NAMENUM_ENTRY *a, const NAMENUM_ENTRY *b)
51 return OPENSSL_strcasecmp(a->name, b->name);
54 static void namenum_free(NAMENUM_ENTRY *n)
57 OPENSSL_free(n->name);
61 /* OSSL_LIB_CTX_METHOD functions for a namemap stored in a library context */
63 static void *stored_namemap_new(OSSL_LIB_CTX *libctx)
65 OSSL_NAMEMAP *namemap = ossl_namemap_new();
73 static void stored_namemap_free(void *vnamemap)
75 OSSL_NAMEMAP *namemap = vnamemap;
77 if (namemap != NULL) {
78 /* Pretend it isn't stored, or ossl_namemap_free() will do nothing */
80 ossl_namemap_free(namemap);
84 static const OSSL_LIB_CTX_METHOD stored_namemap_method = {
85 OSSL_LIB_CTX_METHOD_DEFAULT_PRIORITY,
95 int ossl_namemap_empty(OSSL_NAMEMAP *namemap)
97 #ifdef TSAN_REQUIRES_LOCKING
104 if (!CRYPTO_THREAD_read_lock(namemap->lock))
106 rv = namemap->max_number == 0;
107 CRYPTO_THREAD_unlock(namemap->lock);
110 /* Have TSAN support */
111 return namemap == NULL || tsan_load(&namemap->max_number) == 0;
115 typedef struct doall_names_data_st {
121 static void do_name(const NAMENUM_ENTRY *namenum, DOALL_NAMES_DATA *data)
123 if (namenum->number == data->number)
124 data->names[data->found++] = namenum->name;
127 IMPLEMENT_LHASH_DOALL_ARG_CONST(NAMENUM_ENTRY, DOALL_NAMES_DATA);
130 * Call the callback for all names in the namemap with the given number.
131 * A return value 1 means that the callback was called for all names. A
132 * return value of 0 means that the callback was not called for any names.
134 int ossl_namemap_doall_names(const OSSL_NAMEMAP *namemap, int number,
135 void (*fn)(const char *name, void *data),
138 DOALL_NAMES_DATA cbdata;
142 cbdata.number = number;
146 * We collect all the names first under a read lock. Subsequently we call
147 * the user function, so that we're not holding the read lock when in user
148 * code. This could lead to deadlocks.
150 if (!CRYPTO_THREAD_read_lock(namemap->lock))
153 num_names = lh_NAMENUM_ENTRY_num_items(namemap->namenum);
154 if (num_names == 0) {
155 CRYPTO_THREAD_unlock(namemap->lock);
158 cbdata.names = OPENSSL_malloc(sizeof(*cbdata.names) * num_names);
159 if (cbdata.names == NULL) {
160 CRYPTO_THREAD_unlock(namemap->lock);
163 lh_NAMENUM_ENTRY_doall_DOALL_NAMES_DATA(namemap->namenum, do_name,
165 CRYPTO_THREAD_unlock(namemap->lock);
167 for (i = 0; i < cbdata.found; i++)
168 fn(cbdata.names[i], data);
170 OPENSSL_free(cbdata.names);
174 static int namemap_name2num_n(const OSSL_NAMEMAP *namemap,
175 const char *name, size_t name_len)
177 NAMENUM_ENTRY *namenum_entry, namenum_tmpl;
179 if ((namenum_tmpl.name = OPENSSL_strndup(name, name_len)) == NULL)
181 namenum_tmpl.number = 0;
183 lh_NAMENUM_ENTRY_retrieve(namemap->namenum, &namenum_tmpl);
184 OPENSSL_free(namenum_tmpl.name);
185 return namenum_entry != NULL ? namenum_entry->number : 0;
188 int ossl_namemap_name2num_n(const OSSL_NAMEMAP *namemap,
189 const char *name, size_t name_len)
195 namemap = ossl_namemap_stored(NULL);
201 if (!CRYPTO_THREAD_read_lock(namemap->lock))
203 number = namemap_name2num_n(namemap, name, name_len);
204 CRYPTO_THREAD_unlock(namemap->lock);
209 int ossl_namemap_name2num(const OSSL_NAMEMAP *namemap, const char *name)
214 return ossl_namemap_name2num_n(namemap, name, strlen(name));
217 struct num2name_data_st {
218 size_t idx; /* Countdown */
219 const char *name; /* Result */
222 static void do_num2name(const char *name, void *vdata)
224 struct num2name_data_st *data = vdata;
228 else if (data->name == NULL)
232 const char *ossl_namemap_num2name(const OSSL_NAMEMAP *namemap, int number,
235 struct num2name_data_st data;
239 if (!ossl_namemap_doall_names(namemap, number, do_num2name, &data))
244 static int namemap_add_name_n(OSSL_NAMEMAP *namemap, int number,
245 const char *name, size_t name_len)
247 NAMENUM_ENTRY *namenum = NULL;
250 /* If it already exists, we don't add it */
251 if ((tmp_number = namemap_name2num_n(namemap, name, name_len)) != 0)
254 if ((namenum = OPENSSL_zalloc(sizeof(*namenum))) == NULL
255 || (namenum->name = OPENSSL_strndup(name, name_len)) == NULL)
258 /* The tsan_counter use here is safe since we're under lock */
260 number != 0 ? number : 1 + tsan_counter(&namemap->max_number);
261 (void)lh_NAMENUM_ENTRY_insert(namemap->namenum, namenum);
263 if (lh_NAMENUM_ENTRY_error(namemap->namenum))
265 return namenum->number;
268 namenum_free(namenum);
272 int ossl_namemap_add_name_n(OSSL_NAMEMAP *namemap, int number,
273 const char *name, size_t name_len)
279 namemap = ossl_namemap_stored(NULL);
282 if (name == NULL || name_len == 0 || namemap == NULL)
285 if (!CRYPTO_THREAD_write_lock(namemap->lock))
287 tmp_number = namemap_add_name_n(namemap, number, name, name_len);
288 CRYPTO_THREAD_unlock(namemap->lock);
292 int ossl_namemap_add_name(OSSL_NAMEMAP *namemap, int number, const char *name)
297 return ossl_namemap_add_name_n(namemap, number, name, strlen(name));
300 int ossl_namemap_add_names(OSSL_NAMEMAP *namemap, int number,
301 const char *names, const char separator)
306 /* Check that we have a namemap */
307 if (!ossl_assert(namemap != NULL)) {
308 ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
312 if (!CRYPTO_THREAD_write_lock(namemap->lock))
315 * Check that no name is an empty string, and that all names have at
316 * most one numeric identity together.
318 for (p = names; *p != '\0'; p = (q == NULL ? p + l : q + 1)) {
321 if ((q = strchr(p, separator)) == NULL)
322 l = strlen(p); /* offset to \0 */
324 l = q - p; /* offset to the next separator */
326 this_number = namemap_name2num_n(namemap, p, l);
328 if (*p == '\0' || *p == separator) {
329 ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_BAD_ALGORITHM_NAME);
333 number = this_number;
334 } else if (this_number != 0 && this_number != number) {
335 ERR_raise_data(ERR_LIB_CRYPTO, CRYPTO_R_CONFLICTING_NAMES,
336 "\"%.*s\" has an existing different identity %d (from \"%s\")",
337 l, p, this_number, names);
342 /* Now that we have checked, register all names */
343 for (p = names; *p != '\0'; p = (q == NULL ? p + l : q + 1)) {
346 if ((q = strchr(p, separator)) == NULL)
347 l = strlen(p); /* offset to \0 */
349 l = q - p; /* offset to the next separator */
351 this_number = namemap_add_name_n(namemap, number, p, l);
353 number = this_number;
354 } else if (this_number != number) {
355 ERR_raise_data(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR,
356 "Got number %d when expecting %d",
357 this_number, number);
362 CRYPTO_THREAD_unlock(namemap->lock);
366 CRYPTO_THREAD_unlock(namemap->lock);
376 #include <openssl/evp.h>
378 /* Creates an initial namemap with names found in the legacy method db */
379 static void get_legacy_evp_names(int base_nid, int nid, const char *pem_name,
385 if (base_nid != NID_undef) {
386 num = ossl_namemap_add_name(arg, num, OBJ_nid2sn(base_nid));
387 num = ossl_namemap_add_name(arg, num, OBJ_nid2ln(base_nid));
390 if (nid != NID_undef) {
391 num = ossl_namemap_add_name(arg, num, OBJ_nid2sn(nid));
392 num = ossl_namemap_add_name(arg, num, OBJ_nid2ln(nid));
393 if ((obj = OBJ_nid2obj(nid)) != NULL) {
394 char txtoid[OSSL_MAX_NAME_SIZE];
396 if (OBJ_obj2txt(txtoid, sizeof(txtoid), obj, 1) > 0)
397 num = ossl_namemap_add_name(arg, num, txtoid);
400 if (pem_name != NULL)
401 num = ossl_namemap_add_name(arg, num, pem_name);
404 static void get_legacy_cipher_names(const OBJ_NAME *on, void *arg)
406 const EVP_CIPHER *cipher = (void *)OBJ_NAME_get(on->name, on->type);
409 get_legacy_evp_names(NID_undef, EVP_CIPHER_get_type(cipher), NULL, arg);
412 static void get_legacy_md_names(const OBJ_NAME *on, void *arg)
414 const EVP_MD *md = (void *)OBJ_NAME_get(on->name, on->type);
417 get_legacy_evp_names(0, EVP_MD_get_type(md), NULL, arg);
420 static void get_legacy_pkey_meth_names(const EVP_PKEY_ASN1_METHOD *ameth,
423 int nid = 0, base_nid = 0, flags = 0;
424 const char *pem_name = NULL;
426 EVP_PKEY_asn1_get0_info(&nid, &base_nid, &flags, NULL, &pem_name, ameth);
427 if (nid != NID_undef) {
428 if ((flags & ASN1_PKEY_ALIAS) == 0) {
431 /* We know that the name "DHX" is used too */
432 get_legacy_evp_names(0, nid, "DHX", arg);
435 get_legacy_evp_names(0, nid, pem_name, arg);
439 * Treat aliases carefully, some of them are undesirable, or
440 * should not be treated as such for providers.
446 * SM2 is a separate keytype with providers, not an alias for
449 get_legacy_evp_names(0, nid, pem_name, arg);
452 /* Use the short name of the base nid as the common reference */
453 get_legacy_evp_names(base_nid, nid, pem_name, arg);
461 * Constructors / destructors
462 * ==========================
465 OSSL_NAMEMAP *ossl_namemap_stored(OSSL_LIB_CTX *libctx)
470 OSSL_NAMEMAP *namemap =
471 ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_NAMEMAP_INDEX,
472 &stored_namemap_method);
478 nms = ossl_namemap_empty(namemap);
481 * Could not get lock to make the count, so maybe internal objects
482 * weren't added. This seems safest.
489 /* Before pilfering, we make sure the legacy database is populated */
490 OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
491 | OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
493 OBJ_NAME_do_all(OBJ_NAME_TYPE_CIPHER_METH,
494 get_legacy_cipher_names, namemap);
495 OBJ_NAME_do_all(OBJ_NAME_TYPE_MD_METH,
496 get_legacy_md_names, namemap);
498 /* We also pilfer data from the legacy EVP_PKEY_ASN1_METHODs */
499 for (i = 0, end = EVP_PKEY_asn1_get_count(); i < end; i++)
500 get_legacy_pkey_meth_names(EVP_PKEY_asn1_get0(i), namemap);
507 OSSL_NAMEMAP *ossl_namemap_new(void)
509 OSSL_NAMEMAP *namemap;
511 if ((namemap = OPENSSL_zalloc(sizeof(*namemap))) != NULL
512 && (namemap->lock = CRYPTO_THREAD_lock_new()) != NULL
513 && (namemap->namenum =
514 lh_NAMENUM_ENTRY_new(namenum_hash, namenum_cmp)) != NULL)
517 ossl_namemap_free(namemap);
521 void ossl_namemap_free(OSSL_NAMEMAP *namemap)
523 if (namemap == NULL || namemap->stored)
526 lh_NAMENUM_ENTRY_doall(namemap->namenum, namenum_free);
527 lh_NAMENUM_ENTRY_free(namemap->namenum);
529 CRYPTO_THREAD_lock_free(namemap->lock);
530 OPENSSL_free(namemap);