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openssl/crypto/core_namemap.c

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/*
* Copyright 2019-2025 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 "internal/namemap.h"
#include "internal/tsan_assist.h"
#include "internal/hashtable.h"
#include "internal/sizes.h"
#include "crypto/context.h"
#define NAMEMAP_HT_BUCKETS 512
HT_START_KEY_DEFN(namenum_key)
HT_DEF_KEY_FIELD_CHAR_ARRAY(name, 64)
HT_END_KEY_DEFN(NAMENUM_KEY)
/*-
* The namemap itself
* ==================
*/
typedef STACK_OF(OPENSSL_STRING) NAMES;
DEFINE_STACK_OF(NAMES)
struct ossl_namemap_st {
/* Flags */
unsigned int stored:1; /* If 1, it's stored in a library context */
HT *namenum_ht; /* Name->number mapping */
CRYPTO_RWLOCK *lock;
STACK_OF(NAMES) *numnames;
TSAN_QUALIFIER int max_number; /* Current max number */
};
static void name_string_free(char *name)
{
OPENSSL_free(name);
}
static void names_free(NAMES *n)
{
sk_OPENSSL_STRING_pop_free(n, name_string_free);
}
/* OSSL_LIB_CTX_METHOD functions for a namemap stored in a library context */
void *ossl_stored_namemap_new(OSSL_LIB_CTX *libctx)
{
OSSL_NAMEMAP *namemap = ossl_namemap_new(libctx);
if (namemap != NULL)
namemap->stored = 1;
return namemap;
}
void ossl_stored_namemap_free(void *vnamemap)
{
OSSL_NAMEMAP *namemap = vnamemap;
if (namemap != NULL) {
/* Pretend it isn't stored, or ossl_namemap_free() will do nothing */
namemap->stored = 0;
ossl_namemap_free(namemap);
}
}
/*-
* API functions
* =============
*/
int ossl_namemap_empty(OSSL_NAMEMAP *namemap)
{
#ifdef TSAN_REQUIRES_LOCKING
/* No TSAN support */
int rv;
if (namemap == NULL)
return 1;
if (!CRYPTO_THREAD_read_lock(namemap->lock))
return -1;
rv = namemap->max_number == 0;
CRYPTO_THREAD_unlock(namemap->lock);
return rv;
#else
/* Have TSAN support */
return namemap == NULL || tsan_load(&namemap->max_number) == 0;
#endif
}
/*
* Call the callback for all names in the namemap with the given number.
* A return value 1 means that the callback was called for all names. A
* return value of 0 means that the callback was not called for any names.
*/
int ossl_namemap_doall_names(const OSSL_NAMEMAP *namemap, int number,
void (*fn)(const char *name, void *data),
void *data)
{
int i;
NAMES *names;
if (namemap == NULL || number <= 0)
return 0;
/*
* We duplicate the NAMES stack under a read lock. Subsequently we call
* the user function, so that we're not holding the read lock when in user
* code. This could lead to deadlocks.
*/
if (!CRYPTO_THREAD_read_lock(namemap->lock))
return 0;
names = sk_NAMES_value(namemap->numnames, number - 1);
if (names != NULL)
names = sk_OPENSSL_STRING_dup(names);
CRYPTO_THREAD_unlock(namemap->lock);
if (names == NULL)
return 0;
for (i = 0; i < sk_OPENSSL_STRING_num(names); i++)
fn(sk_OPENSSL_STRING_value(names, i), data);
sk_OPENSSL_STRING_free(names);
return i > 0;
}
int ossl_namemap_name2num(const OSSL_NAMEMAP *namemap, const char *name)
{
int number = 0;
HT_VALUE *val;
NAMENUM_KEY key;
#ifndef FIPS_MODULE
if (namemap == NULL)
namemap = ossl_namemap_stored(NULL);
#endif
if (namemap == NULL)
return 0;
HT_INIT_KEY(&key);
HT_SET_KEY_STRING_CASE(&key, name, name);
val = ossl_ht_get(namemap->namenum_ht, TO_HT_KEY(&key));
if (val != NULL)
/* We store a (small) int directly instead of a pointer to it. */
number = (int)(intptr_t)val->value;
return number;
}
/* TODO: Optimize to avoid strndup() */
int ossl_namemap_name2num_n(const OSSL_NAMEMAP *namemap,
const char *name, size_t name_len)
{
char *tmp;
int ret;
if (name == NULL || (tmp = OPENSSL_strndup(name, name_len)) == NULL)
return 0;
ret = ossl_namemap_name2num(namemap, tmp);
OPENSSL_free(tmp);
return ret;
}
const char *ossl_namemap_num2name(const OSSL_NAMEMAP *namemap, int number,
size_t idx)
{
NAMES *names;
const char *ret = NULL;
if (namemap == NULL || number <= 0)
return NULL;
if (!CRYPTO_THREAD_read_lock(namemap->lock))
return NULL;
names = sk_NAMES_value(namemap->numnames, number - 1);
if (names != NULL)
ret = sk_OPENSSL_STRING_value(names, idx);
CRYPTO_THREAD_unlock(namemap->lock);
return ret;
}
/* This function is not thread safe, the namemap must be locked */
static int numname_insert(OSSL_NAMEMAP *namemap, int number,
const char *name)
{
NAMES *names;
char *tmpname;
if (number > 0) {
names = sk_NAMES_value(namemap->numnames, number - 1);
if (!ossl_assert(names != NULL)) {
/* cannot happen */
return 0;
}
} else {
/* a completely new entry */
names = sk_OPENSSL_STRING_new_null();
if (names == NULL)
return 0;
}
if ((tmpname = OPENSSL_strdup(name)) == NULL)
goto err;
if (!sk_OPENSSL_STRING_push(names, tmpname))
goto err;
tmpname = NULL;
if (number <= 0) {
if (!sk_NAMES_push(namemap->numnames, names))
goto err;
number = sk_NAMES_num(namemap->numnames);
}
return number;
err:
if (number <= 0)
sk_OPENSSL_STRING_pop_free(names, name_string_free);
OPENSSL_free(tmpname);
return 0;
}
/* This function is not thread safe, the namemap must be locked */
static int namemap_add_name(OSSL_NAMEMAP *namemap, int number,
const char *name)
{
int ret;
HT_VALUE val = { 0 };
NAMENUM_KEY key;
/* If it already exists, we don't add it */
if ((ret = ossl_namemap_name2num(namemap, name)) != 0)
return ret;
if ((number = numname_insert(namemap, number, name)) == 0)
return 0;
/* Using tsan_store alone here is safe since we're under lock */
tsan_store(&namemap->max_number, number);
HT_INIT_KEY(&key);
HT_SET_KEY_STRING_CASE(&key, name, name);
val.value = (void *)(intptr_t)number;
ret = ossl_ht_insert(namemap->namenum_ht, TO_HT_KEY(&key), &val, NULL);
if (!ossl_assert(ret != 0)) /* cannot happen as we are under write lock */
return 0;
if (ret < 1) {
/* unable to insert due to too many collisions */
ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_MANY_NAMES);
return 0;
}
return number;
}
int ossl_namemap_add_name(OSSL_NAMEMAP *namemap, int number,
const char *name)
{
int tmp_number;
#ifndef FIPS_MODULE
if (namemap == NULL)
namemap = ossl_namemap_stored(NULL);
#endif
if (name == NULL || *name == 0 || namemap == NULL)
return 0;
if (!CRYPTO_THREAD_write_lock(namemap->lock))
return 0;
tmp_number = namemap_add_name(namemap, number, name);
CRYPTO_THREAD_unlock(namemap->lock);
return tmp_number;
}
int ossl_namemap_add_names(OSSL_NAMEMAP *namemap, int number,
const char *names, const char separator)
{
char *tmp, *p, *q, *endp;
/* Check that we have a namemap */
if (!ossl_assert(namemap != NULL)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if ((tmp = OPENSSL_strdup(names)) == NULL)
return 0;
if (!CRYPTO_THREAD_write_lock(namemap->lock)) {
OPENSSL_free(tmp);
return 0;
}
/*
* Check that no name is an empty string, and that all names have at
* most one numeric identity together.
*/
for (p = tmp; *p != '\0'; p = q) {
int this_number;
size_t l;
if ((q = strchr(p, separator)) == NULL) {
l = strlen(p); /* offset to \0 */
q = p + l;
} else {
l = q - p; /* offset to the next separator */
*q++ = '\0';
}
if (*p == '\0') {
ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_BAD_ALGORITHM_NAME);
number = 0;
goto end;
}
this_number = ossl_namemap_name2num(namemap, p);
if (number == 0) {
number = this_number;
} else if (this_number != 0 && this_number != number) {
ERR_raise_data(ERR_LIB_CRYPTO, CRYPTO_R_CONFLICTING_NAMES,
"\"%s\" has an existing different identity %d (from \"%s\")",
p, this_number, names);
number = 0;
goto end;
}
}
endp = p;
/* Now that we have checked, register all names */
for (p = tmp; p < endp; p = q) {
int this_number;
q = p + strlen(p) + 1;
this_number = namemap_add_name(namemap, number, p);
if (number == 0) {
number = this_number;
} else if (this_number != number) {
ERR_raise_data(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR,
"Got number %d when expecting %d",
this_number, number);
number = 0;
goto end;
}
}
end:
CRYPTO_THREAD_unlock(namemap->lock);
OPENSSL_free(tmp);
return number;
}
/*-
* Pre-population
* ==============
*/
#ifndef FIPS_MODULE
#include <openssl/evp.h>
/* Creates an initial namemap with names found in the legacy method db */
static void get_legacy_evp_names(int base_nid, int nid, const char *pem_name,
void *arg)
{
int num = 0;
ASN1_OBJECT *obj;
if (base_nid != NID_undef) {
num = ossl_namemap_add_name(arg, num, OBJ_nid2sn(base_nid));
num = ossl_namemap_add_name(arg, num, OBJ_nid2ln(base_nid));
}
if (nid != NID_undef) {
num = ossl_namemap_add_name(arg, num, OBJ_nid2sn(nid));
num = ossl_namemap_add_name(arg, num, OBJ_nid2ln(nid));
if ((obj = OBJ_nid2obj(nid)) != NULL) {
char txtoid[OSSL_MAX_NAME_SIZE];
if (OBJ_obj2txt(txtoid, sizeof(txtoid), obj, 1) > 0)
num = ossl_namemap_add_name(arg, num, txtoid);
}
}
if (pem_name != NULL)
num = ossl_namemap_add_name(arg, num, pem_name);
}
static void get_legacy_cipher_names(const OBJ_NAME *on, void *arg)
{
const EVP_CIPHER *cipher = (void *)OBJ_NAME_get(on->name, on->type);
if (cipher != NULL)
get_legacy_evp_names(NID_undef, EVP_CIPHER_get_type(cipher), NULL, arg);
}
static void get_legacy_md_names(const OBJ_NAME *on, void *arg)
{
const EVP_MD *md = (void *)OBJ_NAME_get(on->name, on->type);
if (md != NULL)
get_legacy_evp_names(0, EVP_MD_get_type(md), NULL, arg);
}
static void get_legacy_pkey_meth_names(const EVP_PKEY_ASN1_METHOD *ameth,
void *arg)
{
int nid = 0, base_nid = 0, flags = 0;
const char *pem_name = NULL;
EVP_PKEY_asn1_get0_info(&nid, &base_nid, &flags, NULL, &pem_name, ameth);
if (nid != NID_undef) {
if ((flags & ASN1_PKEY_ALIAS) == 0) {
switch (nid) {
case EVP_PKEY_DHX:
/* We know that the name "DHX" is used too */
get_legacy_evp_names(0, nid, "DHX", arg);
/* FALLTHRU */
default:
get_legacy_evp_names(0, nid, pem_name, arg);
}
} else {
/*
* Treat aliases carefully, some of them are undesirable, or
* should not be treated as such for providers.
*/
switch (nid) {
case EVP_PKEY_SM2:
/*
* SM2 is a separate keytype with providers, not an alias for
* EC.
*/
get_legacy_evp_names(0, nid, pem_name, arg);
break;
default:
/* Use the short name of the base nid as the common reference */
get_legacy_evp_names(base_nid, nid, pem_name, arg);
}
}
}
}
#endif
/*-
* Constructors / destructors
* ==========================
*/
OSSL_NAMEMAP *ossl_namemap_stored(OSSL_LIB_CTX *libctx)
{
#ifndef FIPS_MODULE
int nms;
#endif
OSSL_NAMEMAP *namemap =
ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_NAMEMAP_INDEX);
if (namemap == NULL)
return NULL;
#ifndef FIPS_MODULE
nms = ossl_namemap_empty(namemap);
if (nms < 0) {
/*
* Could not get lock to make the count, so maybe internal objects
* weren't added. This seems safest.
*/
return NULL;
}
if (nms == 1) {
int i, end;
/* Before pilfering, we make sure the legacy database is populated */
OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
| OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
OBJ_NAME_do_all(OBJ_NAME_TYPE_CIPHER_METH,
get_legacy_cipher_names, namemap);
OBJ_NAME_do_all(OBJ_NAME_TYPE_MD_METH,
get_legacy_md_names, namemap);
/* We also pilfer data from the legacy EVP_PKEY_ASN1_METHODs */
for (i = 0, end = EVP_PKEY_asn1_get_count(); i < end; i++)
get_legacy_pkey_meth_names(EVP_PKEY_asn1_get0(i), namemap);
}
#endif
return namemap;
}
OSSL_NAMEMAP *ossl_namemap_new(OSSL_LIB_CTX *libctx)
{
OSSL_NAMEMAP *namemap;
HT_CONFIG htconf = { NULL, NULL, NULL, NAMEMAP_HT_BUCKETS, 1, 1 };
htconf.ctx = libctx;
if ((namemap = OPENSSL_zalloc(sizeof(*namemap))) == NULL)
goto err;
if ((namemap->lock = CRYPTO_THREAD_lock_new()) == NULL)
goto err;
if ((namemap->namenum_ht = ossl_ht_new(&htconf)) == NULL)
goto err;
if ((namemap->numnames = sk_NAMES_new_null()) == NULL)
goto err;
return namemap;
err:
ossl_namemap_free(namemap);
return NULL;
}
void ossl_namemap_free(OSSL_NAMEMAP *namemap)
{
if (namemap == NULL || namemap->stored)
return;
sk_NAMES_pop_free(namemap->numnames, names_free);
ossl_ht_free(namemap->namenum_ht);
CRYPTO_THREAD_lock_free(namemap->lock);
OPENSSL_free(namemap);
}
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