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f2182a4e RL |
1 | /* |
2 | * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
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 | |
8 | */ | |
9 | ||
10 | #include "internal/namemap.h" | |
11 | #include <openssl/lhash.h> | |
f2182a4e | 12 | |
651d4418 RL |
13 | /*- |
14 | * The namenum entry | |
15 | * ================= | |
16 | */ | |
f2182a4e | 17 | typedef struct { |
651d4418 | 18 | char *name; |
f2182a4e | 19 | int number; |
651d4418 | 20 | } NAMENUM_ENTRY; |
f2182a4e | 21 | |
651d4418 | 22 | DEFINE_LHASH_OF(NAMENUM_ENTRY); |
f2182a4e | 23 | |
651d4418 RL |
24 | /*- |
25 | * The namemap itself | |
26 | * ================== | |
27 | */ | |
f2182a4e RL |
28 | |
29 | struct ossl_namemap_st { | |
30 | /* Flags */ | |
31 | unsigned int stored:1; /* If 1, it's stored in a library context */ | |
32 | ||
33 | CRYPTO_RWLOCK *lock; | |
651d4418 RL |
34 | LHASH_OF(NAMENUM_ENTRY) *namenum; /* Name->number mapping */ |
35 | int max_number; /* Current max number */ | |
f2182a4e RL |
36 | }; |
37 | ||
38 | /* LHASH callbacks */ | |
39 | ||
651d4418 | 40 | static unsigned long namenum_hash(const NAMENUM_ENTRY *n) |
f2182a4e RL |
41 | { |
42 | return OPENSSL_LH_strhash(n->name); | |
43 | } | |
44 | ||
651d4418 | 45 | static int namenum_cmp(const NAMENUM_ENTRY *a, const NAMENUM_ENTRY *b) |
f2182a4e RL |
46 | { |
47 | return strcmp(a->name, b->name); | |
48 | } | |
49 | ||
651d4418 | 50 | static void namenum_free(NAMENUM_ENTRY *n) |
f2182a4e | 51 | { |
651d4418 RL |
52 | if (n != NULL) |
53 | OPENSSL_free(n->name); | |
f2182a4e RL |
54 | OPENSSL_free(n); |
55 | } | |
56 | ||
57 | /* OPENSSL_CTX_METHOD functions for a namemap stored in a library context */ | |
58 | ||
59 | static void *stored_namemap_new(OPENSSL_CTX *libctx) | |
60 | { | |
61 | OSSL_NAMEMAP *namemap = ossl_namemap_new(); | |
62 | ||
63 | if (namemap != NULL) | |
64 | namemap->stored = 1; | |
65 | ||
66 | return namemap; | |
67 | } | |
68 | ||
69 | static void stored_namemap_free(void *vnamemap) | |
70 | { | |
71 | OSSL_NAMEMAP *namemap = vnamemap; | |
72 | ||
73 | /* Pretend it isn't stored, or ossl_namemap_free() will do nothing */ | |
74 | namemap->stored = 0; | |
75 | ossl_namemap_free(namemap); | |
76 | } | |
77 | ||
78 | static const OPENSSL_CTX_METHOD stored_namemap_method = { | |
79 | stored_namemap_new, | |
80 | stored_namemap_free, | |
81 | }; | |
82 | ||
651d4418 RL |
83 | /*- |
84 | * API functions | |
85 | * ============= | |
86 | */ | |
f2182a4e RL |
87 | |
88 | OSSL_NAMEMAP *ossl_namemap_stored(OPENSSL_CTX *libctx) | |
89 | { | |
90 | return openssl_ctx_get_data(libctx, OPENSSL_CTX_NAMEMAP_INDEX, | |
91 | &stored_namemap_method); | |
92 | } | |
93 | ||
94 | OSSL_NAMEMAP *ossl_namemap_new(void) | |
95 | { | |
96 | OSSL_NAMEMAP *namemap; | |
97 | ||
98 | if ((namemap = OPENSSL_zalloc(sizeof(*namemap))) != NULL | |
99 | && (namemap->lock = CRYPTO_THREAD_lock_new()) != NULL | |
f2182a4e | 100 | && (namemap->namenum = |
651d4418 | 101 | lh_NAMENUM_ENTRY_new(namenum_hash, namenum_cmp)) != NULL) |
f2182a4e | 102 | return namemap; |
f2182a4e RL |
103 | |
104 | ossl_namemap_free(namemap); | |
105 | return NULL; | |
106 | } | |
107 | ||
108 | void ossl_namemap_free(OSSL_NAMEMAP *namemap) | |
109 | { | |
110 | if (namemap == NULL || namemap->stored) | |
111 | return; | |
112 | ||
651d4418 RL |
113 | lh_NAMENUM_ENTRY_doall(namemap->namenum, namenum_free); |
114 | lh_NAMENUM_ENTRY_free(namemap->namenum); | |
f2182a4e RL |
115 | |
116 | CRYPTO_THREAD_lock_free(namemap->lock); | |
117 | OPENSSL_free(namemap); | |
118 | } | |
119 | ||
651d4418 RL |
120 | typedef struct doall_names_data_st { |
121 | int number; | |
122 | void (*fn)(const char *name, void *data); | |
123 | void *data; | |
124 | } DOALL_NAMES_DATA; | |
f2182a4e | 125 | |
651d4418 | 126 | static void do_name(const NAMENUM_ENTRY *namenum, DOALL_NAMES_DATA *data) |
f2182a4e | 127 | { |
651d4418 RL |
128 | if (namenum->number == data->number) |
129 | data->fn(namenum->name, data->data); | |
130 | } | |
f2182a4e | 131 | |
651d4418 | 132 | IMPLEMENT_LHASH_DOALL_ARG_CONST(NAMENUM_ENTRY, DOALL_NAMES_DATA); |
f2182a4e | 133 | |
651d4418 RL |
134 | void ossl_namemap_doall_names(const OSSL_NAMEMAP *namemap, int number, |
135 | void (*fn)(const char *name, void *data), | |
136 | void *data) | |
137 | { | |
138 | DOALL_NAMES_DATA cbdata; | |
f2182a4e | 139 | |
651d4418 RL |
140 | cbdata.number = number; |
141 | cbdata.fn = fn; | |
142 | cbdata.data = data; | |
f2182a4e | 143 | CRYPTO_THREAD_read_lock(namemap->lock); |
651d4418 RL |
144 | lh_NAMENUM_ENTRY_doall_DOALL_NAMES_DATA(namemap->namenum, do_name, |
145 | &cbdata); | |
f2182a4e | 146 | CRYPTO_THREAD_unlock(namemap->lock); |
f2182a4e RL |
147 | } |
148 | ||
651d4418 | 149 | int ossl_namemap_name2num(const OSSL_NAMEMAP *namemap, const char *name) |
f2182a4e | 150 | { |
651d4418 RL |
151 | NAMENUM_ENTRY *namenum_entry, namenum_tmpl; |
152 | int number = 0; | |
f2182a4e RL |
153 | |
154 | #ifndef FIPS_MODE | |
155 | if (namemap == NULL) | |
156 | namemap = ossl_namemap_stored(NULL); | |
157 | #endif | |
158 | ||
159 | if (namemap == NULL) | |
160 | return 0; | |
161 | ||
651d4418 RL |
162 | namenum_tmpl.name = (char *)name; |
163 | namenum_tmpl.number = 0; | |
f2182a4e | 164 | CRYPTO_THREAD_read_lock(namemap->lock); |
651d4418 RL |
165 | namenum_entry = |
166 | lh_NAMENUM_ENTRY_retrieve(namemap->namenum, &namenum_tmpl); | |
167 | if (namenum_entry != NULL) | |
168 | number = namenum_entry->number; | |
f2182a4e RL |
169 | CRYPTO_THREAD_unlock(namemap->lock); |
170 | ||
651d4418 | 171 | return number; |
f2182a4e RL |
172 | } |
173 | ||
651d4418 | 174 | int ossl_namemap_add(OSSL_NAMEMAP *namemap, int number, const char *name) |
f2182a4e | 175 | { |
651d4418 RL |
176 | NAMENUM_ENTRY *namenum = NULL; |
177 | int tmp_number; | |
f2182a4e RL |
178 | |
179 | #ifndef FIPS_MODE | |
180 | if (namemap == NULL) | |
181 | namemap = ossl_namemap_stored(NULL); | |
182 | #endif | |
183 | ||
184 | if (name == NULL || namemap == NULL) | |
185 | return 0; | |
186 | ||
651d4418 RL |
187 | if ((tmp_number = ossl_namemap_name2num(namemap, name)) != 0) |
188 | return tmp_number; /* Pretend success */ | |
f2182a4e RL |
189 | |
190 | CRYPTO_THREAD_write_lock(namemap->lock); | |
191 | ||
651d4418 RL |
192 | if ((namenum = OPENSSL_zalloc(sizeof(*namenum))) == NULL |
193 | || (namenum->name = OPENSSL_strdup(name)) == NULL) | |
f2182a4e RL |
194 | goto err; |
195 | ||
651d4418 RL |
196 | namenum->number = tmp_number = |
197 | number != 0 ? number : ++namemap->max_number; | |
198 | (void)lh_NAMENUM_ENTRY_insert(namemap->namenum, namenum); | |
199 | ||
200 | if (lh_NAMENUM_ENTRY_error(namemap->namenum)) | |
f2182a4e RL |
201 | goto err; |
202 | ||
203 | CRYPTO_THREAD_unlock(namemap->lock); | |
204 | ||
651d4418 | 205 | return tmp_number; |
f2182a4e RL |
206 | |
207 | err: | |
651d4418 RL |
208 | namenum_free(namenum); |
209 | ||
210 | CRYPTO_THREAD_unlock(namemap->lock); | |
f2182a4e RL |
211 | return 0; |
212 | } |