/src/libressl/crypto/engine/tb_asnmth.c
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1 | | /* $OpenBSD: tb_asnmth.c,v 1.6 2017/01/29 17:49:23 beck Exp $ */ |
2 | | /* ==================================================================== |
3 | | * Copyright (c) 2006 The OpenSSL Project. All rights reserved. |
4 | | * |
5 | | * Redistribution and use in source and binary forms, with or without |
6 | | * modification, are permitted provided that the following conditions |
7 | | * are met: |
8 | | * |
9 | | * 1. Redistributions of source code must retain the above copyright |
10 | | * notice, this list of conditions and the following disclaimer. |
11 | | * |
12 | | * 2. Redistributions in binary form must reproduce the above copyright |
13 | | * notice, this list of conditions and the following disclaimer in |
14 | | * the documentation and/or other materials provided with the |
15 | | * distribution. |
16 | | * |
17 | | * 3. All advertising materials mentioning features or use of this |
18 | | * software must display the following acknowledgment: |
19 | | * "This product includes software developed by the OpenSSL Project |
20 | | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
21 | | * |
22 | | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
23 | | * endorse or promote products derived from this software without |
24 | | * prior written permission. For written permission, please contact |
25 | | * licensing@OpenSSL.org. |
26 | | * |
27 | | * 5. Products derived from this software may not be called "OpenSSL" |
28 | | * nor may "OpenSSL" appear in their names without prior written |
29 | | * permission of the OpenSSL Project. |
30 | | * |
31 | | * 6. Redistributions of any form whatsoever must retain the following |
32 | | * acknowledgment: |
33 | | * "This product includes software developed by the OpenSSL Project |
34 | | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
35 | | * |
36 | | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
37 | | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
38 | | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
39 | | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
40 | | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
41 | | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
42 | | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
43 | | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
44 | | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
45 | | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
46 | | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
47 | | * OF THE POSSIBILITY OF SUCH DAMAGE. |
48 | | * ==================================================================== |
49 | | * |
50 | | * This product includes cryptographic software written by Eric Young |
51 | | * (eay@cryptsoft.com). This product includes software written by Tim |
52 | | * Hudson (tjh@cryptsoft.com). |
53 | | * |
54 | | */ |
55 | | |
56 | | #include <string.h> |
57 | | |
58 | | #include <openssl/err.h> |
59 | | |
60 | | #include "eng_int.h" |
61 | | #include "asn1_locl.h" |
62 | | #include <openssl/evp.h> |
63 | | |
64 | | /* If this symbol is defined then ENGINE_get_pkey_asn1_meth_engine(), the |
65 | | * function that is used by EVP to hook in pkey_asn1_meth code and cache |
66 | | * defaults (etc), will display brief debugging summaries to stderr with the |
67 | | * 'nid'. */ |
68 | | /* #define ENGINE_PKEY_ASN1_METH_DEBUG */ |
69 | | |
70 | | static ENGINE_TABLE *pkey_asn1_meth_table = NULL; |
71 | | |
72 | | void |
73 | | ENGINE_unregister_pkey_asn1_meths(ENGINE *e) |
74 | 0 | { |
75 | 0 | engine_table_unregister(&pkey_asn1_meth_table, e); |
76 | 0 | } |
77 | | |
78 | | static void |
79 | | engine_unregister_all_pkey_asn1_meths(void) |
80 | 0 | { |
81 | 0 | engine_table_cleanup(&pkey_asn1_meth_table); |
82 | 0 | } |
83 | | |
84 | | int |
85 | | ENGINE_register_pkey_asn1_meths(ENGINE *e) |
86 | 0 | { |
87 | 0 | if (e->pkey_asn1_meths) { |
88 | 0 | const int *nids; |
89 | 0 | int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0); |
90 | 0 | if (num_nids > 0) |
91 | 0 | return engine_table_register(&pkey_asn1_meth_table, |
92 | 0 | engine_unregister_all_pkey_asn1_meths, e, nids, |
93 | 0 | num_nids, 0); |
94 | 0 | } |
95 | 0 | return 1; |
96 | 0 | } |
97 | | |
98 | | void |
99 | | ENGINE_register_all_pkey_asn1_meths(void) |
100 | 0 | { |
101 | 0 | ENGINE *e; |
102 | |
|
103 | 0 | for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e)) |
104 | 0 | ENGINE_register_pkey_asn1_meths(e); |
105 | 0 | } |
106 | | |
107 | | int |
108 | | ENGINE_set_default_pkey_asn1_meths(ENGINE *e) |
109 | 0 | { |
110 | 0 | if (e->pkey_asn1_meths) { |
111 | 0 | const int *nids; |
112 | 0 | int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0); |
113 | 0 | if (num_nids > 0) |
114 | 0 | return engine_table_register(&pkey_asn1_meth_table, |
115 | 0 | engine_unregister_all_pkey_asn1_meths, e, nids, |
116 | 0 | num_nids, 1); |
117 | 0 | } |
118 | 0 | return 1; |
119 | 0 | } |
120 | | |
121 | | /* Exposed API function to get a functional reference from the implementation |
122 | | * table (ie. try to get a functional reference from the tabled structural |
123 | | * references) for a given pkey_asn1_meth 'nid' */ |
124 | | ENGINE * |
125 | | ENGINE_get_pkey_asn1_meth_engine(int nid) |
126 | 0 | { |
127 | 0 | return engine_table_select(&pkey_asn1_meth_table, nid); |
128 | 0 | } |
129 | | |
130 | | /* Obtains a pkey_asn1_meth implementation from an ENGINE functional reference */ |
131 | | const EVP_PKEY_ASN1_METHOD * |
132 | | ENGINE_get_pkey_asn1_meth(ENGINE *e, int nid) |
133 | 0 | { |
134 | 0 | EVP_PKEY_ASN1_METHOD *ret; |
135 | 0 | ENGINE_PKEY_ASN1_METHS_PTR fn = ENGINE_get_pkey_asn1_meths(e); |
136 | |
|
137 | 0 | if (!fn || !fn(e, &ret, NULL, nid)) { |
138 | 0 | ENGINEerror(ENGINE_R_UNIMPLEMENTED_PUBLIC_KEY_METHOD); |
139 | 0 | return NULL; |
140 | 0 | } |
141 | 0 | return ret; |
142 | 0 | } |
143 | | |
144 | | /* Gets the pkey_asn1_meth callback from an ENGINE structure */ |
145 | | ENGINE_PKEY_ASN1_METHS_PTR |
146 | | ENGINE_get_pkey_asn1_meths(const ENGINE *e) |
147 | 0 | { |
148 | 0 | return e->pkey_asn1_meths; |
149 | 0 | } |
150 | | |
151 | | /* Sets the pkey_asn1_meth callback in an ENGINE structure */ |
152 | | int |
153 | | ENGINE_set_pkey_asn1_meths(ENGINE *e, ENGINE_PKEY_ASN1_METHS_PTR f) |
154 | 0 | { |
155 | 0 | e->pkey_asn1_meths = f; |
156 | 0 | return 1; |
157 | 0 | } |
158 | | |
159 | | /* Internal function to free up EVP_PKEY_ASN1_METHOD structures before an |
160 | | * ENGINE is destroyed |
161 | | */ |
162 | | |
163 | | void |
164 | | engine_pkey_asn1_meths_free(ENGINE *e) |
165 | 0 | { |
166 | 0 | int i; |
167 | 0 | EVP_PKEY_ASN1_METHOD *pkm; |
168 | |
|
169 | 0 | if (e->pkey_asn1_meths) { |
170 | 0 | const int *pknids; |
171 | 0 | int npknids; |
172 | 0 | npknids = e->pkey_asn1_meths(e, NULL, &pknids, 0); |
173 | 0 | for (i = 0; i < npknids; i++) { |
174 | 0 | if (e->pkey_asn1_meths(e, &pkm, NULL, pknids[i])) { |
175 | 0 | EVP_PKEY_asn1_free(pkm); |
176 | 0 | } |
177 | 0 | } |
178 | 0 | } |
179 | 0 | } |
180 | | |
181 | | /* Find a method based on a string. This does a linear search through |
182 | | * all implemented algorithms. This is OK in practice because only |
183 | | * a small number of algorithms are likely to be implemented in an engine |
184 | | * and it is not used for speed critical operations. |
185 | | */ |
186 | | |
187 | | const EVP_PKEY_ASN1_METHOD * |
188 | | ENGINE_get_pkey_asn1_meth_str(ENGINE *e, const char *str, int len) |
189 | 0 | { |
190 | 0 | int i, nidcount; |
191 | 0 | const int *nids; |
192 | 0 | EVP_PKEY_ASN1_METHOD *ameth; |
193 | |
|
194 | 0 | if (!e->pkey_asn1_meths) |
195 | 0 | return NULL; |
196 | 0 | if (len == -1) |
197 | 0 | len = strlen(str); |
198 | 0 | nidcount = e->pkey_asn1_meths(e, NULL, &nids, 0); |
199 | 0 | for (i = 0; i < nidcount; i++) { |
200 | 0 | e->pkey_asn1_meths(e, &ameth, NULL, nids[i]); |
201 | 0 | if (((int)strlen(ameth->pem_str) == len) && |
202 | 0 | !strncasecmp(ameth->pem_str, str, len)) |
203 | 0 | return ameth; |
204 | 0 | } |
205 | 0 | return NULL; |
206 | 0 | } |
207 | | |
208 | | typedef struct { |
209 | | ENGINE *e; |
210 | | const EVP_PKEY_ASN1_METHOD *ameth; |
211 | | const char *str; |
212 | | int len; |
213 | | } ENGINE_FIND_STR; |
214 | | |
215 | | static void |
216 | | look_str_cb(int nid, STACK_OF(ENGINE) *sk, ENGINE *def, void *arg) |
217 | 0 | { |
218 | 0 | ENGINE_FIND_STR *lk = arg; |
219 | 0 | int i; |
220 | |
|
221 | 0 | if (lk->ameth) |
222 | 0 | return; |
223 | 0 | for (i = 0; i < sk_ENGINE_num(sk); i++) { |
224 | 0 | ENGINE *e = sk_ENGINE_value(sk, i); |
225 | 0 | EVP_PKEY_ASN1_METHOD *ameth; |
226 | 0 | e->pkey_asn1_meths(e, &ameth, NULL, nid); |
227 | 0 | if (((int)strlen(ameth->pem_str) == lk->len) && |
228 | 0 | !strncasecmp(ameth->pem_str, lk->str, lk->len)) { |
229 | 0 | lk->e = e; |
230 | 0 | lk->ameth = ameth; |
231 | 0 | return; |
232 | 0 | } |
233 | 0 | } |
234 | 0 | } |
235 | | |
236 | | const EVP_PKEY_ASN1_METHOD * |
237 | | ENGINE_pkey_asn1_find_str(ENGINE **pe, const char *str, int len) |
238 | 0 | { |
239 | 0 | ENGINE_FIND_STR fstr; |
240 | |
|
241 | 0 | fstr.e = NULL; |
242 | 0 | fstr.ameth = NULL; |
243 | 0 | fstr.str = str; |
244 | 0 | fstr.len = len; |
245 | 0 | CRYPTO_w_lock(CRYPTO_LOCK_ENGINE); |
246 | 0 | engine_table_doall(pkey_asn1_meth_table, look_str_cb, &fstr); |
247 | | /* If found obtain a structural reference to engine */ |
248 | 0 | if (fstr.e) { |
249 | 0 | fstr.e->struct_ref++; |
250 | 0 | engine_ref_debug(fstr.e, 0, 1) |
251 | 0 | } |
252 | 0 | *pe = fstr.e; |
253 | 0 | CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE); |
254 | 0 | return fstr.ameth; |
255 | 0 | } |