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/*
* Copyright 2019-2021 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 "e_os.h" /* strcasecmp */
#include "internal/namemap.h"
#include <openssl/lhash.h>
#include "crypto/lhash.h" /* ossl_lh_strcasehash */
#include "internal/tsan_assist.h"
/*-
* The namenum entry
* =================
*/
typedef struct {
char *name;
int number;
} NAMENUM_ENTRY;
DEFINE_LHASH_OF(NAMENUM_ENTRY);
/*-
* The namemap itself
* ==================
*/
struct ossl_namemap_st {
/* Flags */
unsigned int stored:1; /* If 1, it's stored in a library context */
CRYPTO_RWLOCK *lock;
LHASH_OF(NAMENUM_ENTRY) *namenum; /* Name->number mapping */
#ifdef tsan_ld_acq
TSAN_QUALIFIER int max_number; /* Current max number TSAN version */
#else
int max_number; /* Current max number plain version */
#endif
};
/* LHASH callbacks */
static unsigned long namenum_hash(const NAMENUM_ENTRY *n)
{
return ossl_lh_strcasehash(n->name);
}
static int namenum_cmp(const NAMENUM_ENTRY *a, const NAMENUM_ENTRY *b)
{
return strcasecmp(a->name, b->name);
}
static void namenum_free(NAMENUM_ENTRY *n)
{
if (n != NULL)
OPENSSL_free(n->name);
OPENSSL_free(n);
}
/* OSSL_LIB_CTX_METHOD functions for a namemap stored in a library context */
static void *stored_namemap_new(OSSL_LIB_CTX *libctx)
{
OSSL_NAMEMAP *namemap = ossl_namemap_new();
if (namemap != NULL)
namemap->stored = 1;
return namemap;
}
static void 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);
}
}
static const OSSL_LIB_CTX_METHOD stored_namemap_method = {
stored_namemap_new,
stored_namemap_free,
};
/*-
* API functions
* =============
*/
int ossl_namemap_empty(OSSL_NAMEMAP *namemap)
{
#ifdef tsan_ld_acq
/* Have TSAN support */
return namemap == NULL || tsan_load(&namemap->max_number) == 0;
#else
/* 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;
#endif
}
typedef struct doall_names_data_st {
int number;
const char **names;
int found;
} DOALL_NAMES_DATA;
static void do_name(const NAMENUM_ENTRY *namenum, DOALL_NAMES_DATA *data)
{
if (namenum->number == data->number)
data->names[data->found++] = namenum->name;
}
IMPLEMENT_LHASH_DOALL_ARG_CONST(NAMENUM_ENTRY, DOALL_NAMES_DATA);
/*
* 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)
{
DOALL_NAMES_DATA cbdata;
size_t num_names;
int i;
cbdata.number = number;
cbdata.found = 0;
/*
* We collect all the names first 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;
num_names = lh_NAMENUM_ENTRY_num_items(namemap->namenum);
if (num_names == 0) {
CRYPTO_THREAD_unlock(namemap->lock);
return 0;
}
cbdata.names = OPENSSL_malloc(sizeof(*cbdata.names) * num_names);
if (cbdata.names == NULL) {
CRYPTO_THREAD_unlock(namemap->lock);
return 0;
}
lh_NAMENUM_ENTRY_doall_DOALL_NAMES_DATA(namemap->namenum, do_name,
&cbdata);
CRYPTO_THREAD_unlock(namemap->lock);
for (i = 0; i < cbdata.found; i++)
fn(cbdata.names[i], data);
OPENSSL_free(cbdata.names);
return 1;
}
static int namemap_name2num_n(const OSSL_NAMEMAP *namemap,
const char *name, size_t name_len)
{
NAMENUM_ENTRY *namenum_entry, namenum_tmpl;
if ((namenum_tmpl.name = OPENSSL_strndup(name, name_len)) == NULL)
return 0;
namenum_tmpl.number = 0;
namenum_entry =
lh_NAMENUM_ENTRY_retrieve(namemap->namenum, &namenum_tmpl);
OPENSSL_free(namenum_tmpl.name);
return namenum_entry != NULL ? namenum_entry->number : 0;
}
int ossl_namemap_name2num_n(const OSSL_NAMEMAP *namemap,
const char *name, size_t name_len)
{
int number;
#ifndef FIPS_MODULE
if (namemap == NULL)
namemap = ossl_namemap_stored(NULL);
#endif
if (namemap == NULL)
return 0;
if (!CRYPTO_THREAD_read_lock(namemap->lock))
return 0;
number = namemap_name2num_n(namemap, name, name_len);
CRYPTO_THREAD_unlock(namemap->lock);
return number;
}
int ossl_namemap_name2num(const OSSL_NAMEMAP *namemap, const char *name)
{
if (name == NULL)
return 0;
return ossl_namemap_name2num_n(namemap, name, strlen(name));
}
struct num2name_data_st {
size_t idx; /* Countdown */
const char *name; /* Result */
};
static void do_num2name(const char *name, void *vdata)
{
struct num2name_data_st *data = vdata;
if (data->idx > 0)
data->idx--;
else if (data->name == NULL)
data->name = name;
}
const char *ossl_namemap_num2name(const OSSL_NAMEMAP *namemap, int number,
size_t idx)
{
struct num2name_data_st data;
data.idx = idx;
data.name = NULL;
if (!ossl_namemap_doall_names(namemap, number, do_num2name, &data))
return NULL;
return data.name;
}
static int namemap_add_name_n(OSSL_NAMEMAP *namemap, int number,
const char *name, size_t name_len)
{
NAMENUM_ENTRY *namenum = NULL;
int tmp_number;
/* If it already exists, we don't add it */
if ((tmp_number = namemap_name2num_n(namemap, name, name_len)) != 0)
return tmp_number;
if ((namenum = OPENSSL_zalloc(sizeof(*namenum))) == NULL
|| (namenum->name = OPENSSL_strndup(name, name_len)) == NULL)
goto err;
namenum->number =
number !=
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