1 /*
2 * Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
4 *
5 * Licensed under the Apache License 2.0 (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
9 */
10
11 #include <string.h>
12 #include <openssl/err.h>
13 #include <openssl/lhash.h>
14 #include "internal/propertyerr.h"
15 #include "internal/property.h"
16 #include "internal/core.h"
17 #include "property_local.h"
18
19 /*
20 * Implement a property definition cache.
21 * These functions assume that they are called under a write lock.
22 * No attempt is made to clean out the cache, except when it is shut down.
23 */
24
25 typedef struct {
26 const char *prop;
27 OSSL_PROPERTY_LIST *defn;
28 char body[1];
29 } PROPERTY_DEFN_ELEM;
30
31 DEFINE_LHASH_OF(PROPERTY_DEFN_ELEM);
32
property_defn_hash(const PROPERTY_DEFN_ELEM * a)33 static unsigned long property_defn_hash(const PROPERTY_DEFN_ELEM *a)
34 {
35 return OPENSSL_LH_strhash(a->prop);
36 }
37
property_defn_cmp(const PROPERTY_DEFN_ELEM * a,const PROPERTY_DEFN_ELEM * b)38 static int property_defn_cmp(const PROPERTY_DEFN_ELEM *a,
39 const PROPERTY_DEFN_ELEM *b)
40 {
41 return strcmp(a->prop, b->prop);
42 }
43
property_defn_free(PROPERTY_DEFN_ELEM * elem)44 static void property_defn_free(PROPERTY_DEFN_ELEM *elem)
45 {
46 ossl_property_free(elem->defn);
47 OPENSSL_free(elem);
48 }
49
property_defns_free(void * vproperty_defns)50 static void property_defns_free(void *vproperty_defns)
51 {
52 LHASH_OF(PROPERTY_DEFN_ELEM) *property_defns = vproperty_defns;
53
54 if (property_defns != NULL) {
55 lh_PROPERTY_DEFN_ELEM_doall(property_defns,
56 &property_defn_free);
57 lh_PROPERTY_DEFN_ELEM_free(property_defns);
58 }
59 }
60
property_defns_new(OSSL_LIB_CTX * ctx)61 static void *property_defns_new(OSSL_LIB_CTX *ctx) {
62 return lh_PROPERTY_DEFN_ELEM_new(&property_defn_hash, &property_defn_cmp);
63 }
64
65 static const OSSL_LIB_CTX_METHOD property_defns_method = {
66 OSSL_LIB_CTX_METHOD_DEFAULT_PRIORITY,
67 property_defns_new,
68 property_defns_free,
69 };
70
ossl_prop_defn_get(OSSL_LIB_CTX * ctx,const char * prop)71 OSSL_PROPERTY_LIST *ossl_prop_defn_get(OSSL_LIB_CTX *ctx, const char *prop)
72 {
73 PROPERTY_DEFN_ELEM elem, *r;
74 LHASH_OF(PROPERTY_DEFN_ELEM) *property_defns;
75
76 property_defns = ossl_lib_ctx_get_data(ctx,
77 OSSL_LIB_CTX_PROPERTY_DEFN_INDEX,
78 &property_defns_method);
79 if (property_defns == NULL || !ossl_lib_ctx_read_lock(ctx))
80 return NULL;
81
82 elem.prop = prop;
83 r = lh_PROPERTY_DEFN_ELEM_retrieve(property_defns, &elem);
84 ossl_lib_ctx_unlock(ctx);
85 if (r == NULL || !ossl_assert(r->defn != NULL))
86 return NULL;
87 return r->defn;
88 }
89
90 /*
91 * Cache the property list for a given property string *pl.
92 * If an entry already exists in the cache *pl is freed and
93 * overwritten with the existing entry from the cache.
94 */
ossl_prop_defn_set(OSSL_LIB_CTX * ctx,const char * prop,OSSL_PROPERTY_LIST ** pl)95 int ossl_prop_defn_set(OSSL_LIB_CTX *ctx, const char *prop,
96 OSSL_PROPERTY_LIST **pl)
97 {
98 PROPERTY_DEFN_ELEM elem, *old, *p = NULL;
99 size_t len;
100 LHASH_OF(PROPERTY_DEFN_ELEM) *property_defns;
101 int res = 1;
102
103 property_defns = ossl_lib_ctx_get_data(ctx,
104 OSSL_LIB_CTX_PROPERTY_DEFN_INDEX,
105 &property_defns_method);
106 if (property_defns == NULL)
107 return 0;
108
109 if (prop == NULL)
110 return 1;
111
112 if (!ossl_lib_ctx_write_lock(ctx))
113 return 0;
114 elem.prop = prop;
115 if (pl == NULL) {
116 lh_PROPERTY_DEFN_ELEM_delete(property_defns, &elem);
117 goto end;
118 }
119 /* check if property definition is in the cache already */
120 if ((p = lh_PROPERTY_DEFN_ELEM_retrieve(property_defns, &elem)) != NULL) {
121 ossl_property_free(*pl);
122 *pl = p->defn;
123 goto end;
124 }
125 len = strlen(prop);
126 p = OPENSSL_malloc(sizeof(*p) + len);
127 if (p != NULL) {
128 p->prop = p->body;
129 p->defn = *pl;
130 memcpy(p->body, prop, len + 1);
131 old = lh_PROPERTY_DEFN_ELEM_insert(property_defns, p);
132 if (!ossl_assert(old == NULL))
133 /* This should not happen. An existing entry is handled above. */
134 goto end;
135 if (!lh_PROPERTY_DEFN_ELEM_error(property_defns))
136 goto end;
137 }
138 OPENSSL_free(p);
139 res = 0;
140 end:
141 ossl_lib_ctx_unlock(ctx);
142 return res;
143 }
144