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c13d2ab4 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 <stddef.h> | |
11 | #include <openssl/ossl_typ.h> | |
12 | #include <openssl/evp.h> | |
13 | #include <openssl/core.h> | |
14 | #include "internal/cryptlib.h" | |
15 | #include "internal/thread_once.h" | |
c13d2ab4 RL |
16 | #include "internal/property.h" |
17 | #include "internal/core.h" | |
baff732d | 18 | #include "internal/namemap.h" |
c13d2ab4 RL |
19 | #include "internal/evp_int.h" /* evp_locl.h needs it */ |
20 | #include "evp_locl.h" | |
21 | ||
c13d2ab4 RL |
22 | static void default_method_store_free(void *vstore) |
23 | { | |
24 | ossl_method_store_free(vstore); | |
25 | } | |
26 | ||
1aedc35f | 27 | static void *default_method_store_new(OPENSSL_CTX *ctx) |
c13d2ab4 | 28 | { |
1aedc35f | 29 | return ossl_method_store_new(ctx); |
c13d2ab4 RL |
30 | } |
31 | ||
32 | ||
33 | static const OPENSSL_CTX_METHOD default_method_store_method = { | |
34 | default_method_store_new, | |
35 | default_method_store_free, | |
36 | }; | |
37 | ||
c13d2ab4 RL |
38 | /* Data to be passed through ossl_method_construct() */ |
39 | struct method_data_st { | |
baff732d | 40 | OPENSSL_CTX *libctx; |
c13d2ab4 | 41 | const char *name; |
c13d2ab4 | 42 | OSSL_METHOD_CONSTRUCT_METHOD *mcm; |
6b9e3724 RL |
43 | void *(*method_from_dispatch)(const char *, const OSSL_DISPATCH *, |
44 | OSSL_PROVIDER *); | |
c13d2ab4 RL |
45 | int (*refcnt_up_method)(void *method); |
46 | void (*destruct_method)(void *method); | |
47 | }; | |
48 | ||
49 | /* | |
50 | * Generic routines to fetch / create EVP methods with ossl_method_construct() | |
51 | */ | |
1aedc35f | 52 | static void *alloc_tmp_method_store(OPENSSL_CTX *ctx) |
c13d2ab4 | 53 | { |
1aedc35f | 54 | return ossl_method_store_new(ctx); |
c13d2ab4 RL |
55 | } |
56 | ||
57 | static void dealloc_tmp_method_store(void *store) | |
58 | { | |
59 | if (store != NULL) | |
60 | ossl_method_store_free(store); | |
61 | } | |
62 | ||
cb929645 | 63 | static OSSL_METHOD_STORE *get_default_method_store(OPENSSL_CTX *libctx) |
c13d2ab4 | 64 | { |
1aedc35f MC |
65 | return openssl_ctx_get_data(libctx, OPENSSL_CTX_DEFAULT_METHOD_STORE_INDEX, |
66 | &default_method_store_method); | |
c13d2ab4 RL |
67 | } |
68 | ||
2ccb1b4e RL |
69 | /* |
70 | * To identity the method in the method store, we mix the name identity | |
71 | * with the operation identity, with the assumption that we don't have | |
72 | * more than 2^24 names or more than 2^8 operation types. | |
73 | * | |
74 | * The resulting identity is a 32-bit integer, composed like this: | |
75 | * | |
76 | * +---------24 bits--------+-8 bits-+ | |
77 | * | name identity | op id | | |
78 | * +------------------------+--------+ | |
79 | */ | |
80 | static uint32_t method_id(unsigned int operation_id, unsigned int name_id) | |
81 | { | |
82 | if (!ossl_assert(name_id < (1 << 24) || operation_id < (1 << 8)) | |
83 | || !ossl_assert(name_id > 0 && operation_id > 0)) | |
84 | return 0; | |
85 | return ((name_id << 8) & 0xFFFFFF00) | (operation_id & 0x000000FF); | |
86 | } | |
87 | ||
c13d2ab4 | 88 | static void *get_method_from_store(OPENSSL_CTX *libctx, void *store, |
2ccb1b4e RL |
89 | int operation_id, const char *name, |
90 | const char *propquery, void *data) | |
c13d2ab4 RL |
91 | { |
92 | struct method_data_st *methdata = data; | |
93 | void *method = NULL; | |
2e49c054 | 94 | OSSL_NAMEMAP *namemap; |
2ccb1b4e RL |
95 | int nameid; |
96 | uint32_t methid; | |
c13d2ab4 RL |
97 | |
98 | if (store == NULL | |
99 | && (store = get_default_method_store(libctx)) == NULL) | |
100 | return NULL; | |
101 | ||
2e49c054 | 102 | if ((namemap = ossl_namemap_stored(libctx)) == NULL |
651d4418 | 103 | || (nameid = ossl_namemap_name2num(namemap, name)) == 0 |
2ccb1b4e | 104 | || (methid = method_id(operation_id, nameid)) == 0) |
2e49c054 RL |
105 | return NULL; |
106 | ||
2ccb1b4e | 107 | (void)ossl_method_store_fetch(store, methid, propquery, &method); |
c13d2ab4 RL |
108 | |
109 | if (method != NULL | |
110 | && !methdata->refcnt_up_method(method)) { | |
111 | method = NULL; | |
112 | } | |
113 | return method; | |
114 | } | |
115 | ||
116 | static int put_method_in_store(OPENSSL_CTX *libctx, void *store, | |
2ccb1b4e RL |
117 | void *method, int operation_id, |
118 | const char *name, const char *propdef, | |
119 | void *data) | |
c13d2ab4 RL |
120 | { |
121 | struct method_data_st *methdata = data; | |
2e49c054 | 122 | OSSL_NAMEMAP *namemap; |
2ccb1b4e RL |
123 | int nameid; |
124 | uint32_t methid; | |
dc46e3dd | 125 | |
2e49c054 | 126 | if ((namemap = ossl_namemap_stored(methdata->libctx)) == NULL |
651d4418 | 127 | || (nameid = ossl_namemap_add(namemap, 0, name)) == 0 |
2ccb1b4e | 128 | || (methid = method_id(operation_id, nameid)) == 0) |
dc46e3dd | 129 | return 0; |
c13d2ab4 RL |
130 | |
131 | if (store == NULL | |
132 | && (store = get_default_method_store(libctx)) == NULL) | |
133 | return 0; | |
134 | ||
b1d40ddf RL |
135 | return ossl_method_store_add(store, methid, propdef, method, |
136 | methdata->refcnt_up_method, | |
137 | methdata->destruct_method); | |
c13d2ab4 RL |
138 | } |
139 | ||
2e49c054 RL |
140 | static void *construct_method(const char *name, const OSSL_DISPATCH *fns, |
141 | OSSL_PROVIDER *prov, void *data) | |
c13d2ab4 RL |
142 | { |
143 | struct method_data_st *methdata = data; | |
c13d2ab4 | 144 | |
6b9e3724 | 145 | return methdata->method_from_dispatch(name, fns, prov); |
c13d2ab4 RL |
146 | } |
147 | ||
148 | static void destruct_method(void *method, void *data) | |
149 | { | |
150 | struct method_data_st *methdata = data; | |
151 | ||
152 | methdata->destruct_method(method); | |
153 | } | |
154 | ||
155 | void *evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id, | |
2e49c054 | 156 | const char *name, const char *properties, |
6b9e3724 RL |
157 | void *(*new_method)(const char *name, |
158 | const OSSL_DISPATCH *fns, | |
c13d2ab4 | 159 | OSSL_PROVIDER *prov), |
7c95390e | 160 | int (*up_ref_method)(void *), |
0211740f | 161 | void (*free_method)(void *)) |
c13d2ab4 | 162 | { |
e019da7b | 163 | OSSL_METHOD_STORE *store = get_default_method_store(libctx); |
baff732d | 164 | OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx); |
2ccb1b4e RL |
165 | int nameid = 0; |
166 | uint32_t methid = 0; | |
c13d2ab4 RL |
167 | void *method = NULL; |
168 | ||
baff732d | 169 | if (store == NULL || namemap == NULL) |
e019da7b RL |
170 | return NULL; |
171 | ||
2ccb1b4e RL |
172 | /* |
173 | * If there's ever an operation_id == 0 passed, we have an internal | |
174 | * programming error. | |
175 | */ | |
176 | if (!ossl_assert(operation_id > 0)) | |
177 | return NULL; | |
178 | ||
179 | /* | |
180 | * method_id returns 0 if we have too many operations (more than | |
181 | * about 2^8) or too many names (more than about 2^24). In that | |
182 | * case, we can't create any new method. | |
183 | */ | |
651d4418 | 184 | if ((nameid = ossl_namemap_name2num(namemap, name)) != 0 |
2ccb1b4e RL |
185 | && (methid = method_id(operation_id, nameid)) == 0) |
186 | return NULL; | |
187 | ||
188 | if (nameid == 0 | |
189 | || !ossl_method_store_cache_get(store, methid, properties, | |
190 | &method)) { | |
c13d2ab4 RL |
191 | OSSL_METHOD_CONSTRUCT_METHOD mcm = { |
192 | alloc_tmp_method_store, | |
193 | dealloc_tmp_method_store, | |
194 | get_method_from_store, | |
195 | put_method_in_store, | |
196 | construct_method, | |
197 | destruct_method | |
198 | }; | |
199 | struct method_data_st mcmdata; | |
200 | ||
c13d2ab4 | 201 | mcmdata.mcm = &mcm; |
baff732d | 202 | mcmdata.libctx = libctx; |
d5e5e2ff | 203 | mcmdata.name = name; |
c13d2ab4 RL |
204 | mcmdata.method_from_dispatch = new_method; |
205 | mcmdata.destruct_method = free_method; | |
7c95390e | 206 | mcmdata.refcnt_up_method = up_ref_method; |
c13d2ab4 | 207 | mcmdata.destruct_method = free_method; |
2ccb1b4e RL |
208 | if ((method = ossl_method_construct(libctx, operation_id, name, |
209 | properties, 0 /* !force_cache */, | |
08607613 | 210 | &mcm, &mcmdata)) != NULL) { |
2ccb1b4e RL |
211 | /* |
212 | * If construction did create a method for us, we know that | |
213 | * there is a correct nameid and methodid, since those have | |
214 | * already been calculated in get_method_from_store() and | |
215 | * put_method_in_store() above. | |
216 | */ | |
651d4418 | 217 | nameid = ossl_namemap_name2num(namemap, name); |
2ccb1b4e RL |
218 | methid = method_id(operation_id, nameid); |
219 | ossl_method_store_cache_set(store, methid, properties, method); | |
220 | } | |
e019da7b | 221 | } else { |
7c95390e | 222 | up_ref_method(method); |
c13d2ab4 RL |
223 | } |
224 | ||
225 | return method; | |
226 | } | |
cb929645 RL |
227 | |
228 | int EVP_set_default_properties(OPENSSL_CTX *libctx, const char *propq) | |
229 | { | |
230 | OSSL_METHOD_STORE *store = get_default_method_store(libctx); | |
231 | ||
232 | if (store != NULL) | |
233 | return ossl_method_store_set_global_properties(store, propq); | |
234 | EVPerr(EVP_F_EVP_SET_DEFAULT_PROPERTIES, ERR_R_INTERNAL_ERROR); | |
235 | return 0; | |
236 | } | |
3d96a51c RL |
237 | |
238 | struct do_all_data_st { | |
239 | void (*user_fn)(void *method, void *arg); | |
240 | void *user_arg; | |
241 | void *(*new_method)(const char *name, const OSSL_DISPATCH *fns, | |
242 | OSSL_PROVIDER *prov); | |
243 | void (*free_method)(void *); | |
244 | }; | |
245 | ||
246 | static void do_one(OSSL_PROVIDER *provider, const OSSL_ALGORITHM *algo, | |
247 | int no_store, void *vdata) | |
248 | { | |
249 | struct do_all_data_st *data = vdata; | |
250 | void *method = data->new_method(algo->algorithm_name, | |
251 | algo->implementation, provider); | |
252 | ||
253 | if (method != NULL) { | |
254 | data->user_fn(method, data->user_arg); | |
255 | data->free_method(method); | |
256 | } | |
257 | } | |
258 | ||
259 | void evp_generic_do_all(OPENSSL_CTX *libctx, int operation_id, | |
260 | void (*user_fn)(void *method, void *arg), | |
261 | void *user_arg, | |
262 | void *(*new_method)(const char *name, | |
263 | const OSSL_DISPATCH *fns, | |
264 | OSSL_PROVIDER *prov), | |
265 | void (*free_method)(void *)) | |
266 | { | |
267 | struct do_all_data_st data; | |
268 | ||
269 | data.new_method = new_method; | |
270 | data.free_method = free_method; | |
271 | data.user_fn = user_fn; | |
272 | data.user_arg = user_arg; | |
273 | ossl_algorithm_do_all(libctx, operation_id, NULL, do_one, &data); | |
274 | } |