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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" | |
16 | #include "internal/property.h" | |
17 | #include "internal/core.h" | |
18 | #include "internal/namemap.h" | |
19 | #include "internal/evp_int.h" /* evp_locl.h needs it */ | |
20 | #include "evp_locl.h" | |
21 | ||
22 | static void default_method_store_free(void *vstore) | |
23 | { | |
24 | ossl_method_store_free(vstore); | |
25 | } | |
26 | ||
27 | static void *default_method_store_new(OPENSSL_CTX *ctx) | |
28 | { | |
29 | return ossl_method_store_new(ctx); | |
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 | ||
38 | /* Data to be passed through ossl_method_construct() */ | |
39 | struct method_data_st { | |
40 | OPENSSL_CTX *libctx; | |
41 | const char *name; | |
42 | OSSL_METHOD_CONSTRUCT_METHOD *mcm; | |
43 | void *(*method_from_dispatch)(const OSSL_DISPATCH *, OSSL_PROVIDER *); | |
44 | int (*refcnt_up_method)(void *method); | |
45 | void (*destruct_method)(void *method); | |
46 | }; | |
47 | ||
48 | /* | |
49 | * Generic routines to fetch / create EVP methods with ossl_method_construct() | |
50 | */ | |
51 | static void *alloc_tmp_method_store(OPENSSL_CTX *ctx) | |
52 | { | |
53 | return ossl_method_store_new(ctx); | |
54 | } | |
55 | ||
56 | static void dealloc_tmp_method_store(void *store) | |
57 | { | |
58 | if (store != NULL) | |
59 | ossl_method_store_free(store); | |
60 | } | |
61 | ||
62 | static OSSL_METHOD_STORE *get_default_method_store(OPENSSL_CTX *libctx) | |
63 | { | |
64 | return openssl_ctx_get_data(libctx, OPENSSL_CTX_DEFAULT_METHOD_STORE_INDEX, | |
65 | &default_method_store_method); | |
66 | } | |
67 | ||
68 | /* | |
69 | * To identity the method in the method store, we mix the name identity | |
70 | * with the operation identity, with the assumption that we don't have | |
71 | * more than 2^24 names or more than 2^8 operation types. | |
72 | * | |
73 | * The resulting identity is a 32-bit integer, composed like this: | |
74 | * | |
75 | * +---------24 bits--------+-8 bits-+ | |
76 | * | name identity | op id | | |
77 | * +------------------------+--------+ | |
78 | */ | |
79 | static uint32_t method_id(unsigned int operation_id, unsigned int name_id) | |
80 | { | |
81 | if (!ossl_assert(name_id < (1 << 24) || operation_id < (1 << 8)) | |
82 | || !ossl_assert(name_id > 0 && operation_id > 0)) | |
83 | return 0; | |
84 | return ((name_id << 8) & 0xFFFFFF00) | (operation_id & 0x000000FF); | |
85 | } | |
86 | ||
87 | static void *get_method_from_store(OPENSSL_CTX *libctx, void *store, | |
88 | int operation_id, const char *name, | |
89 | const char *propquery, void *data) | |
90 | { | |
91 | struct method_data_st *methdata = data; | |
92 | void *method = NULL; | |
93 | OSSL_NAMEMAP *namemap; | |
94 | int nameid; | |
95 | uint32_t methid; | |
96 | ||
97 | if (store == NULL | |
98 | && (store = get_default_method_store(libctx)) == NULL) | |
99 | return NULL; | |
100 | ||
101 | if ((namemap = ossl_namemap_stored(libctx)) == NULL | |
102 | || (nameid = ossl_namemap_add(namemap, name)) == 0 | |
103 | || (methid = method_id(operation_id, nameid)) == 0) | |
104 | return NULL; | |
105 | ||
106 | (void)ossl_method_store_fetch(store, methid, propquery, &method); | |
107 | ||
108 | if (method != NULL | |
109 | && !methdata->refcnt_up_method(method)) { | |
110 | method = NULL; | |
111 | } | |
112 | return method; | |
113 | } | |
114 | ||
115 | static int put_method_in_store(OPENSSL_CTX *libctx, void *store, | |
116 | void *method, int operation_id, | |
117 | const char *name, const char *propdef, | |
118 | void *data) | |
119 | { | |
120 | struct method_data_st *methdata = data; | |
121 | OSSL_NAMEMAP *namemap; | |
122 | int nameid; | |
123 | uint32_t methid; | |
124 | ||
125 | if ((namemap = ossl_namemap_stored(methdata->libctx)) == NULL | |
126 | || (nameid = ossl_namemap_add(namemap, name)) == 0 | |
127 | || (methid = method_id(operation_id, nameid)) == 0) | |
128 | return 0; | |
129 | ||
130 | if (store == NULL | |
131 | && (store = get_default_method_store(libctx)) == NULL) | |
132 | return 0; | |
133 | ||
134 | if (methdata->refcnt_up_method(method) | |
135 | && ossl_method_store_add(store, methid, propdef, method, | |
136 | methdata->destruct_method)) | |
137 | return 1; | |
138 | return 0; | |
139 | } | |
140 | ||
141 | static void *construct_method(const char *name, const OSSL_DISPATCH *fns, | |
142 | OSSL_PROVIDER *prov, void *data) | |
143 | { | |
144 | struct method_data_st *methdata = data; | |
145 | ||
146 | return methdata->method_from_dispatch(fns, prov); | |
147 | } | |
148 | ||
149 | static void destruct_method(void *method, void *data) | |
150 | { | |
151 | struct method_data_st *methdata = data; | |
152 | ||
153 | methdata->destruct_method(method); | |
154 | } | |
155 | ||
156 | void *evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id, | |
157 | const char *name, const char *properties, | |
158 | void *(*new_method)(const OSSL_DISPATCH *fns, | |
159 | OSSL_PROVIDER *prov), | |
160 | int (*upref_method)(void *), | |
161 | void (*free_method)(void *)) | |
162 | { | |
163 | OSSL_METHOD_STORE *store = get_default_method_store(libctx); | |
164 | OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx); | |
165 | int nameid = 0; | |
166 | uint32_t methid = 0; | |
167 | void *method = NULL; | |
168 | ||
169 | if (store == NULL || namemap == NULL) | |
170 | return NULL; | |
171 | ||
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 | */ | |
184 | if ((nameid = ossl_namemap_number(namemap, name)) != 0 | |
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)) { | |
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 | ||
201 | mcmdata.mcm = &mcm; | |
202 | mcmdata.libctx = libctx; | |
203 | mcmdata.name = name; | |
204 | mcmdata.method_from_dispatch = new_method; | |
205 | mcmdata.destruct_method = free_method; | |
206 | mcmdata.refcnt_up_method = upref_method; | |
207 | mcmdata.destruct_method = free_method; | |
208 | if ((method = ossl_method_construct(libctx, operation_id, name, | |
209 | properties, 0 /* !force_cache */, | |
210 | &mcm, &mcmdata)) == NULL) { | |
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 | */ | |
217 | nameid = ossl_namemap_number(namemap, name); | |
218 | methid = method_id(operation_id, nameid); | |
219 | ossl_method_store_cache_set(store, methid, properties, method); | |
220 | } | |
221 | } else { | |
222 | upref_method(method); | |
223 | } | |
224 | ||
225 | return method; | |
226 | } | |
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 | } |