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1/* $OpenBSD: tb_asnmth.c,v 1.5 2015/02/11 03:19:37 doug 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
70static ENGINE_TABLE *pkey_asn1_meth_table = NULL;
71
72void
73ENGINE_unregister_pkey_asn1_meths(ENGINE *e)
74{
75 engine_table_unregister(&pkey_asn1_meth_table, e);
76}
77
78static void
79engine_unregister_all_pkey_asn1_meths(void)
80{
81 engine_table_cleanup(&pkey_asn1_meth_table);
82}
83
84int
85ENGINE_register_pkey_asn1_meths(ENGINE *e)
86{
87 if (e->pkey_asn1_meths) {
88 const int *nids;
89 int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0);
90 if (num_nids > 0)
91 return engine_table_register(&pkey_asn1_meth_table,
92 engine_unregister_all_pkey_asn1_meths, e, nids,
93 num_nids, 0);
94 }
95 return 1;
96}
97
98void
99ENGINE_register_all_pkey_asn1_meths(void)
100{
101 ENGINE *e;
102
103 for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
104 ENGINE_register_pkey_asn1_meths(e);
105}
106
107int
108ENGINE_set_default_pkey_asn1_meths(ENGINE *e)
109{
110 if (e->pkey_asn1_meths) {
111 const int *nids;
112 int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0);
113 if (num_nids > 0)
114 return engine_table_register(&pkey_asn1_meth_table,
115 engine_unregister_all_pkey_asn1_meths, e, nids,
116 num_nids, 1);
117 }
118 return 1;
119}
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' */
124ENGINE *
125ENGINE_get_pkey_asn1_meth_engine(int nid)
126{
127 return engine_table_select(&pkey_asn1_meth_table, nid);
128}
129
130/* Obtains a pkey_asn1_meth implementation from an ENGINE functional reference */
131const EVP_PKEY_ASN1_METHOD *
132ENGINE_get_pkey_asn1_meth(ENGINE *e, int nid)
133{
134 EVP_PKEY_ASN1_METHOD *ret;
135 ENGINE_PKEY_ASN1_METHS_PTR fn = ENGINE_get_pkey_asn1_meths(e);
136
137 if (!fn || !fn(e, &ret, NULL, nid)) {
138 ENGINEerr(ENGINE_F_ENGINE_GET_PKEY_ASN1_METH,
139 ENGINE_R_UNIMPLEMENTED_PUBLIC_KEY_METHOD);
140 return NULL;
141 }
142 return ret;
143}
144
145/* Gets the pkey_asn1_meth callback from an ENGINE structure */
146ENGINE_PKEY_ASN1_METHS_PTR
147ENGINE_get_pkey_asn1_meths(const ENGINE *e)
148{
149 return e->pkey_asn1_meths;
150}
151
152/* Sets the pkey_asn1_meth callback in an ENGINE structure */
153int
154ENGINE_set_pkey_asn1_meths(ENGINE *e, ENGINE_PKEY_ASN1_METHS_PTR f)
155{
156 e->pkey_asn1_meths = f;
157 return 1;
158}
159
160/* Internal function to free up EVP_PKEY_ASN1_METHOD structures before an
161 * ENGINE is destroyed
162 */
163
164void
165engine_pkey_asn1_meths_free(ENGINE *e)
166{
167 int i;
168 EVP_PKEY_ASN1_METHOD *pkm;
169
170 if (e->pkey_asn1_meths) {
171 const int *pknids;
172 int npknids;
173 npknids = e->pkey_asn1_meths(e, NULL, &pknids, 0);
174 for (i = 0; i < npknids; i++) {
175 if (e->pkey_asn1_meths(e, &pkm, NULL, pknids[i])) {
176 EVP_PKEY_asn1_free(pkm);
177 }
178 }
179 }
180}
181
182/* Find a method based on a string. This does a linear search through
183 * all implemented algorithms. This is OK in practice because only
184 * a small number of algorithms are likely to be implemented in an engine
185 * and it is not used for speed critical operations.
186 */
187
188const EVP_PKEY_ASN1_METHOD *
189ENGINE_get_pkey_asn1_meth_str(ENGINE *e, const char *str, int len)
190{
191 int i, nidcount;
192 const int *nids;
193 EVP_PKEY_ASN1_METHOD *ameth;
194
195 if (!e->pkey_asn1_meths)
196 return NULL;
197 if (len == -1)
198 len = strlen(str);
199 nidcount = e->pkey_asn1_meths(e, NULL, &nids, 0);
200 for (i = 0; i < nidcount; i++) {
201 e->pkey_asn1_meths(e, &ameth, NULL, nids[i]);
202 if (((int)strlen(ameth->pem_str) == len) &&
203 !strncasecmp(ameth->pem_str, str, len))
204 return ameth;
205 }
206 return NULL;
207}
208
209typedef struct {
210 ENGINE *e;
211 const EVP_PKEY_ASN1_METHOD *ameth;
212 const char *str;
213 int len;
214} ENGINE_FIND_STR;
215
216static void
217look_str_cb(int nid, STACK_OF(ENGINE) *sk, ENGINE *def, void *arg)
218{
219 ENGINE_FIND_STR *lk = arg;
220 int i;
221
222 if (lk->ameth)
223 return;
224 for (i = 0; i < sk_ENGINE_num(sk); i++) {
225 ENGINE *e = sk_ENGINE_value(sk, i);
226 EVP_PKEY_ASN1_METHOD *ameth;
227 e->pkey_asn1_meths(e, &ameth, NULL, nid);
228 if (((int)strlen(ameth->pem_str) == lk->len) &&
229 !strncasecmp(ameth->pem_str, lk->str, lk->len)) {
230 lk->e = e;
231 lk->ameth = ameth;
232 return;
233 }
234 }
235}
236
237const EVP_PKEY_ASN1_METHOD *
238ENGINE_pkey_asn1_find_str(ENGINE **pe, const char *str, int len)
239{
240 ENGINE_FIND_STR fstr;
241
242 fstr.e = NULL;
243 fstr.ameth = NULL;
244 fstr.str = str;
245 fstr.len = len;
246 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
247 engine_table_doall(pkey_asn1_meth_table, look_str_cb, &fstr);
248 /* If found obtain a structural reference to engine */
249 if (fstr.e) {
250 fstr.e->struct_ref++;
251 engine_ref_debug(fstr.e, 0, 1)
252 }
253 *pe = fstr.e;
254 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
255 return fstr.ameth;
256}
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