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/*
* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2019, Oracle and/or its affiliates. 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 <string.h>
#include <openssl/crypto.h>
#include <openssl/lhash.h>
#include "crypto/lhash.h"
#include "property_local.h"
/*
* Property strings are a consolidation of all strings seen by the property
* subsystem. There are two name spaces to keep property names separate from
* property values (numeric values are not expected to be cached however).
* They allow a rapid conversion from a string to a unique index and any
* subsequent string comparison can be done via an integer compare.
*
* This implementation uses OpenSSL's standard hash table. There are more
* space and time efficient algorithms if this becomes a bottleneck.
*/
typedef struct {
const char *s;
OSSL_PROPERTY_IDX idx;
char body[1];
} PROPERTY_STRING;
DEFINE_LHASH_OF(PROPERTY_STRING);
typedef LHASH_OF(PROPERTY_STRING) PROP_TABLE;
typedef struct {
PROP_TABLE *prop_names;
PROP_TABLE *prop_values;
OSSL_PROPERTY_IDX prop_name_idx;
OSSL_PROPERTY_IDX prop_value_idx;
} PROPERTY_STRING_DATA;
static unsigned long property_hash(const PROPERTY_STRING *a)
{
return OPENSSL_LH_strhash(a->s);
}
static int property_cmp(const PROPERTY_STRING *a, const PROPERTY_STRING *b)
{
return strcmp(a->s, b->s);
}
static void property_free(PROPERTY_STRING *ps)
{
OPENSSL_free(ps);
}
static void property_table_free(PROP_TABLE **pt)
{
PROP_TABLE *t = *pt;
if (t != NULL) {
lh_PROPERTY_STRING_doall(t, &property_free);
lh_PROPERTY_STRING_free(t);
*pt = NULL;
}
}
static void property_string_data_free(void *vpropdata)
{
PROPERTY_STRING_DATA *propdata = vpropdata;
if (propdata == NULL)
return;
property_table_free(&propdata->prop_names);
property_table_free(&propdata->prop_values);
propdata->prop_name_idx = propdata->prop_value_idx = 0;
OPENSSL_free(propdata);
}
static void *property_string_data_new(OPENSSL_CTX *ctx) {
PROPERTY_STRING_DATA *propdata = OPENSSL_zalloc(sizeof(*propdata));
if (propdata == NULL)
return NULL;
propdata->prop_names = lh_PROPERTY_STRING_new(&property_hash,
&property_cmp);
if (propdata->prop_names == NULL)
goto err;
propdata->prop_values = lh_PROPERTY_STRING_new(&property_hash,
&property_cmp);
if (propdata->prop_values == NULL)
goto err;
return propdata;
err:
property_string_data_free(propdata);
return NULL;
}
static const OPENSSL_CTX_METHOD property_string_data_method = {
property_string_data_new,
property_string_data_free,
};
static PROPERTY_STRING *new_property_string(const char *s,
OSSL_PROPERTY_IDX *pidx)
{
const size_t l = strlen(s);
PROPERTY_STRING *ps = OPENSSL_malloc(sizeof(*ps) + l);
if (ps != NULL) {
memcpy(ps->body, s, l + 1);
ps->s = ps->body;
ps->idx = ++*pidx;
if (ps->idx == 0) {
OPENSSL_free(ps);
return NULL;
}
}
return ps;
}
static OSSL_PROPERTY_IDX ossl_property_string(PROP_TABLE *t,
OSSL_PROPERTY_IDX *pidx,
const char *s)
{
PROPERTY_STRING p, *ps, *ps_new;
p.s = s;
ps = lh_PROPERTY_STRING_retrieve(t, &p);
if (ps == NULL && pidx != NULL)
if ((ps_new = new_property_string(s, pidx)) != NULL) {
lh_PROPERTY_STRING_insert(t, ps_new);
if (lh_PROPERTY_STRING_error(t)) {
property_free(ps_new);
return 0;
}
ps = ps_new;
}
return ps != NULL ? ps->idx : 0;
}
OSSL_PROPERTY_IDX ossl_property_name(OPENSSL_CTX *ctx, const char *s,
int create)
{
PROPERTY_STRING_DATA *propdata
= openssl_ctx_get_data(ctx, OPENSSL_CTX_PROPERTY_STRING_INDEX,
&property_string_data_method);
if (propdata == NULL)
return 0;
return ossl_property_string(propdata->prop_names,
create ? &propdata->prop_name_idx : NULL,
s);
}
OSSL_PROPERTY_IDX ossl_property_value(OPENSSL_CTX *ctx, const char *s,
int create)
{
PROPERTY_STRING_DATA *propdata
= openssl_ctx_get_data(ctx, OPENSSL_CTX_PROPERTY_STRING_INDEX,
&property_string_data_method);
if (propdata == NULL)
return 0;
return ossl_property_string(propdata->prop_values,
create ? &propdata->prop_value_idx : NULL,
s);
}
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