2 * Copyright 2019-2021 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/e_os.h" /* strcasecmp */
11 #include "internal/namemap.h"
12 #include <openssl/lhash.h>
13 #include "crypto/lhash.h" /* ossl_lh_strcasehash */
14 #include "internal/tsan_assist.h"
15 #include "internal/sizes.h"
16 #include "crypto/context.h"
27 DEFINE_LHASH_OF(NAMENUM_ENTRY);
34 struct ossl_namemap_st {
36 unsigned int stored:1; /* If 1, it's stored in a library context */
39 LHASH_OF(NAMENUM_ENTRY) *namenum; /* Name->number mapping */
41 TSAN_QUALIFIER int max_number; /* Current max number */
46 static unsigned long namenum_hash(const NAMENUM_ENTRY *n)
48 return ossl_lh_strcasehash(n->name);
51 static int namenum_cmp(const NAMENUM_ENTRY *a, const NAMENUM_ENTRY *b)
53 return strcasecmp(a->name, b->name);
56 static void namenum_free(NAMENUM_ENTRY *n)
59 OPENSSL_free(n->name);
63 /* OSSL_LIB_CTX_METHOD functions for a namemap stored in a library context */
65 void *ossl_stored_namemap_new(OSSL_LIB_CTX *libctx)
67 OSSL_NAMEMAP *namemap = ossl_namemap_new();
75 void ossl_stored_namemap_free(void *vnamemap)
77 OSSL_NAMEMAP *namemap = vnamemap;
79 if (namemap != NULL) {
80 /* Pretend it isn't stored, or ossl_namemap_free() will do nothing */
82 ossl_namemap_free(namemap);
91 int ossl_namemap_empty(OSSL_NAMEMAP *namemap)
93 #ifdef TSAN_REQUIRES_LOCKING
100 if (!CRYPTO_THREAD_read_lock(namemap->lock))
102 rv = namemap->max_number == 0;
103 CRYPTO_THREAD_unlock(namemap->lock);
106 /* Have TSAN support */
107 return namemap == NULL || tsan_load(&namemap->max_number) == 0;
111 typedef struct doall_names_data_st {
117 static void do_name(const NAMENUM_ENTRY *namenum, DOALL_NAMES_DATA *data)
119 if (namenum->number == data->number)
120 data->names[data->found++] = namenum->name;
123 IMPLEMENT_LHASH_DOALL_ARG_CONST(NAMENUM_ENTRY, DOALL_NAMES_DATA);
126 * Call the callback for all names in the namemap with the given number.
127 * A return value 1 means that the callback was called for all names. A
128 * return value of 0 means that the callback was not called for any names.
130 int ossl_namemap_doall_names(const OSSL_NAMEMAP *namemap, int number,
131 void (*fn)(const char *name, void *data),
134 DOALL_NAMES_DATA cbdata;
138 cbdata.number = number;
142 * We collect all the names first under a read lock. Subsequently we call
143 * the user function, so that we're not holding the read lock when in user
144 * code. This could lead to deadlocks.
146 if (!CRYPTO_THREAD_read_lock(namemap->lock))
149 num_names = lh_NAMENUM_ENTRY_num_items(namemap->namenum);
150 if (num_names == 0) {
151 CRYPTO_THREAD_unlock(namemap->lock);
154 cbdata.names = OPENSSL_malloc(sizeof(*cbdata.names) * num_names);
155 if (cbdata.names == NULL) {
156 CRYPTO_THREAD_unlock(namemap->lock);
159 lh_NAMENUM_ENTRY_doall_DOALL_NAMES_DATA(namemap->namenum, do_name,
161 CRYPTO_THREAD_unlock(namemap->lock);
163 for (i = 0; i < cbdata.found; i++)
164 fn(cbdata.names[i], data);
166 OPENSSL_free(cbdata.names);
170 static int namemap_name2num_n(const OSSL_NAMEMAP *namemap,
171 const char *name, size_t name_len)
173 NAMENUM_ENTRY *namenum_entry, namenum_tmpl;
175 if ((namenum_tmpl.name = OPENSSL_strndup(name, name_len)) == NULL)
177 namenum_tmpl.number = 0;
179 lh_NAMENUM_ENTRY_retrieve(namemap->namenum, &namenum_tmpl);
180 OPENSSL_free(namenum_tmpl.name);
181 return namenum_entry != NULL ? namenum_entry->number : 0;
184 int ossl_namemap_name2num_n(const OSSL_NAMEMAP *namemap,
185 const char *name, size_t name_len)
191 namemap = ossl_namemap_stored(NULL);
197 if (!CRYPTO_THREAD_read_lock(namemap->lock))
199 number = namemap_name2num_n(namemap, name, name_len);
200 CRYPTO_THREAD_unlock(namemap->lock);
205 int ossl_namemap_name2num(const OSSL_NAMEMAP *namemap, const char *name)
210 return ossl_namemap_name2num_n(namemap, name, strlen(name));
213 struct num2name_data_st {
214 size_t idx; /* Countdown */
215 const char *name; /* Result */
218 static void do_num2name(const char *name, void *vdata)
220 struct num2name_data_st *data = vdata;
224 else if (data->name == NULL)
228 const char *ossl_namemap_num2name(const OSSL_NAMEMAP *namemap, int number,
231 struct num2name_data_st data;
235 if (!ossl_namemap_doall_names(namemap, number, do_num2name, &data))
240 static int namemap_add_name_n(OSSL_NAMEMAP *namemap, int number,
241 const char *name, size_t name_len)
243 NAMENUM_ENTRY *namenum = NULL;
246 /* If it already exists, we don't add it */
247 if ((tmp_number = namemap_name2num_n(namemap, name, name_len)) != 0)
250 if ((namenum = OPENSSL_zalloc(sizeof(*namenum))) == NULL
251 || (namenum->name = OPENSSL_strndup(name, name_len)) == NULL)
254 /* The tsan_counter use here is safe since we're under lock */
256 number != 0 ? number : 1 + tsan_counter(&namemap->max_number);
257 (void)lh_NAMENUM_ENTRY_insert(namemap->namenum, namenum);
259 if (lh_NAMENUM_ENTRY_error(namemap->namenum))
261 return namenum->number;
264 namenum_free(namenum);
268 int ossl_namemap_add_name_n(OSSL_NAMEMAP *namemap, int number,
269 const char *name, size_t name_len)
275 namemap = ossl_namemap_stored(NULL);
278 if (name == NULL || name_len == 0 || namemap == NULL)
281 if (!CRYPTO_THREAD_write_lock(namemap->lock))
283 tmp_number = namemap_add_name_n(namemap, number, name, name_len);
284 CRYPTO_THREAD_unlock(namemap->lock);
288 int ossl_namemap_add_name(OSSL_NAMEMAP *namemap, int number, const char *name)
293 return ossl_namemap_add_name_n(namemap, number, name, strlen(name));
296 int ossl_namemap_add_names(OSSL_NAMEMAP *namemap, int number,
297 const char *names, const char separator)
302 /* Check that we have a namemap */
303 if (!ossl_assert(namemap != NULL)) {
304 ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
308 if (!CRYPTO_THREAD_write_lock(namemap->lock))
311 * Check that no name is an empty string, and that all names have at
312 * most one numeric identity together.
314 for (p = names; *p != '\0'; p = (q == NULL ? p + l : q + 1)) {
317 if ((q = strchr(p, separator)) == NULL)
318 l = strlen(p); /* offset to \0 */
320 l = q - p; /* offset to the next separator */
322 this_number = namemap_name2num_n(namemap, p, l);
324 if (*p == '\0' || *p == separator) {
325 ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_BAD_ALGORITHM_NAME);
329 number = this_number;
330 } else if (this_number != 0 && this_number != number) {
331 ERR_raise_data(ERR_LIB_CRYPTO, CRYPTO_R_CONFLICTING_NAMES,
332 "\"%.*s\" has an existing different identity %d (from \"%s\")",
333 l, p, this_number, names);
338 /* Now that we have checked, register all names */
339 for (p = names; *p != '\0'; p = (q == NULL ? p + l : q + 1)) {
342 if ((q = strchr(p, separator)) == NULL)
343 l = strlen(p); /* offset to \0 */
345 l = q - p; /* offset to the next separator */
347 this_number = namemap_add_name_n(namemap, number, p, l);
349 number = this_number;
350 } else if (this_number != number) {
351 ERR_raise_data(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR,
352 "Got number %d when expecting %d",
353 this_number, number);
358 CRYPTO_THREAD_unlock(namemap->lock);
362 CRYPTO_THREAD_unlock(namemap->lock);
372 #include <openssl/evp.h>
374 /* Creates an initial namemap with names found in the legacy method db */
375 static void get_legacy_evp_names(int base_nid, int nid, const char *pem_name,
381 if (base_nid != NID_undef) {
382 num = ossl_namemap_add_name(arg, num, OBJ_nid2sn(base_nid));
383 num = ossl_namemap_add_name(arg, num, OBJ_nid2ln(base_nid));
386 if (nid != NID_undef) {
387 num = ossl_namemap_add_name(arg, num, OBJ_nid2sn(nid));
388 num = ossl_namemap_add_name(arg, num, OBJ_nid2ln(nid));
389 if ((obj = OBJ_nid2obj(nid)) != NULL) {
390 char txtoid[OSSL_MAX_NAME_SIZE];
392 if (OBJ_obj2txt(txtoid, sizeof(txtoid), obj, 1) > 0)
393 num = ossl_namemap_add_name(arg, num, txtoid);
396 if (pem_name != NULL)
397 num = ossl_namemap_add_name(arg, num, pem_name);
400 static void get_legacy_cipher_names(const OBJ_NAME *on, void *arg)
402 const EVP_CIPHER *cipher = (void *)OBJ_NAME_get(on->name, on->type);
405 get_legacy_evp_names(NID_undef, EVP_CIPHER_get_type(cipher), NULL, arg);
408 static void get_legacy_md_names(const OBJ_NAME *on, void *arg)
410 const EVP_MD *md = (void *)OBJ_NAME_get(on->name, on->type);
413 get_legacy_evp_names(0, EVP_MD_get_type(md), NULL, arg);
416 static void get_legacy_pkey_meth_names(const EVP_PKEY_ASN1_METHOD *ameth,
419 int nid = 0, base_nid = 0, flags = 0;
420 const char *pem_name = NULL;
422 EVP_PKEY_asn1_get0_info(&nid, &base_nid, &flags, NULL, &pem_name, ameth);
423 if (nid != NID_undef) {
424 if ((flags & ASN1_PKEY_ALIAS) == 0) {
427 /* We know that the name "DHX" is used too */
428 get_legacy_evp_names(0, nid, "DHX", arg);
431 get_legacy_evp_names(0, nid, pem_name, arg);
435 * Treat aliases carefully, some of them are undesirable, or
436 * should not be treated as such for providers.
442 * SM2 is a separate keytype with providers, not an alias for
445 get_legacy_evp_names(0, nid, pem_name, arg);
448 /* Use the short name of the base nid as the common reference */
449 get_legacy_evp_names(base_nid, nid, pem_name, arg);
457 * Constructors / destructors
458 * ==========================
461 OSSL_NAMEMAP *ossl_namemap_stored(OSSL_LIB_CTX *libctx)
466 OSSL_NAMEMAP *namemap =
467 ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_NAMEMAP_INDEX);
473 nms = ossl_namemap_empty(namemap);
476 * Could not get lock to make the count, so maybe internal objects
477 * weren't added. This seems safest.
484 /* Before pilfering, we make sure the legacy database is populated */
485 OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
486 | OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
488 OBJ_NAME_do_all(OBJ_NAME_TYPE_CIPHER_METH,
489 get_legacy_cipher_names, namemap);
490 OBJ_NAME_do_all(OBJ_NAME_TYPE_MD_METH,
491 get_legacy_md_names, namemap);
493 /* We also pilfer data from the legacy EVP_PKEY_ASN1_METHODs */
494 for (i = 0, end = EVP_PKEY_asn1_get_count(); i < end; i++)
495 get_legacy_pkey_meth_names(EVP_PKEY_asn1_get0(i), namemap);
502 OSSL_NAMEMAP *ossl_namemap_new(void)
504 OSSL_NAMEMAP *namemap;
506 if ((namemap = OPENSSL_zalloc(sizeof(*namemap))) != NULL
507 && (namemap->lock = CRYPTO_THREAD_lock_new()) != NULL
508 && (namemap->namenum =
509 lh_NAMENUM_ENTRY_new(namenum_hash, namenum_cmp)) != NULL)
512 ossl_namemap_free(namemap);
516 void ossl_namemap_free(OSSL_NAMEMAP *namemap)
518 if (namemap == NULL || namemap->stored)
521 lh_NAMENUM_ENTRY_doall(namemap->namenum, namenum_free);
522 lh_NAMENUM_ENTRY_free(namemap->namenum);
524 CRYPTO_THREAD_lock_free(namemap->lock);
525 OPENSSL_free(namemap);