1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57 #include <openssl/x509.h>
58
59 #include <limits.h>
60
61 #include <openssl/asn1.h>
62 #include <openssl/asn1t.h>
63 #include <openssl/bytestring.h>
64 #include <openssl/err.h>
65 #include <openssl/evp.h>
66 #include <openssl/mem.h>
67 #include <openssl/obj.h>
68 #include <openssl/thread.h>
69
70 #include "../internal.h"
71
72 /* Minor tweak to operation: free up EVP_PKEY */
pubkey_cb(int operation,ASN1_VALUE ** pval,const ASN1_ITEM * it,void * exarg)73 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
74 void *exarg)
75 {
76 if (operation == ASN1_OP_FREE_POST) {
77 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
78 EVP_PKEY_free(pubkey->pkey);
79 }
80 return 1;
81 }
82
83 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
84 ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
85 ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
86 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
87
88 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
89
90 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
91 {
92 X509_PUBKEY *pk = NULL;
93 uint8_t *spki = NULL;
94 size_t spki_len;
95
96 if (x == NULL)
97 return (0);
98
99 CBB cbb;
100 if (!CBB_init(&cbb, 0) ||
101 !EVP_marshal_public_key(&cbb, pkey) ||
102 !CBB_finish(&cbb, &spki, &spki_len) ||
103 spki_len > LONG_MAX) {
104 CBB_cleanup(&cbb);
105 OPENSSL_PUT_ERROR(X509, X509_R_PUBLIC_KEY_ENCODE_ERROR);
106 goto error;
107 }
108
109 const uint8_t *p = spki;
110 pk = d2i_X509_PUBKEY(NULL, &p, (long)spki_len);
111 if (pk == NULL || p != spki + spki_len) {
112 OPENSSL_PUT_ERROR(X509, X509_R_PUBLIC_KEY_DECODE_ERROR);
113 goto error;
114 }
115
116 OPENSSL_free(spki);
117 X509_PUBKEY_free(*x);
118 *x = pk;
119
120 return 1;
121 error:
122 X509_PUBKEY_free(pk);
123 OPENSSL_free(spki);
124 return 0;
125 }
126
127 /* g_pubkey_lock is used to protect the initialisation of the |pkey| member of
128 * |X509_PUBKEY| objects. Really |X509_PUBKEY| should have a |CRYPTO_once_t|
129 * inside it for this, but |CRYPTO_once_t| is private and |X509_PUBKEY| is
130 * not. */
131 static struct CRYPTO_STATIC_MUTEX g_pubkey_lock = CRYPTO_STATIC_MUTEX_INIT;
132
X509_PUBKEY_get(X509_PUBKEY * key)133 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
134 {
135 EVP_PKEY *ret = NULL;
136 uint8_t *spki = NULL;
137
138 if (key == NULL)
139 goto error;
140
141 CRYPTO_STATIC_MUTEX_lock_read(&g_pubkey_lock);
142 if (key->pkey != NULL) {
143 CRYPTO_STATIC_MUTEX_unlock_read(&g_pubkey_lock);
144 EVP_PKEY_up_ref(key->pkey);
145 return key->pkey;
146 }
147 CRYPTO_STATIC_MUTEX_unlock_read(&g_pubkey_lock);
148
149 /* Re-encode the |X509_PUBKEY| to DER and parse it. */
150 int spki_len = i2d_X509_PUBKEY(key, &spki);
151 if (spki_len < 0) {
152 goto error;
153 }
154 CBS cbs;
155 CBS_init(&cbs, spki, (size_t)spki_len);
156 ret = EVP_parse_public_key(&cbs);
157 if (ret == NULL || CBS_len(&cbs) != 0) {
158 OPENSSL_PUT_ERROR(X509, X509_R_PUBLIC_KEY_DECODE_ERROR);
159 goto error;
160 }
161
162 /* Check to see if another thread set key->pkey first */
163 CRYPTO_STATIC_MUTEX_lock_write(&g_pubkey_lock);
164 if (key->pkey) {
165 CRYPTO_STATIC_MUTEX_unlock_write(&g_pubkey_lock);
166 EVP_PKEY_free(ret);
167 ret = key->pkey;
168 } else {
169 key->pkey = ret;
170 CRYPTO_STATIC_MUTEX_unlock_write(&g_pubkey_lock);
171 }
172
173 OPENSSL_free(spki);
174 EVP_PKEY_up_ref(ret);
175 return ret;
176
177 error:
178 OPENSSL_free(spki);
179 EVP_PKEY_free(ret);
180 return NULL;
181 }
182
183 /*
184 * Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or
185 * decode as X509_PUBKEY
186 */
187
d2i_PUBKEY(EVP_PKEY ** a,const unsigned char ** pp,long length)188 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
189 {
190 X509_PUBKEY *xpk;
191 EVP_PKEY *pktmp;
192 xpk = d2i_X509_PUBKEY(NULL, pp, length);
193 if (!xpk)
194 return NULL;
195 pktmp = X509_PUBKEY_get(xpk);
196 X509_PUBKEY_free(xpk);
197 if (!pktmp)
198 return NULL;
199 if (a) {
200 EVP_PKEY_free(*a);
201 *a = pktmp;
202 }
203 return pktmp;
204 }
205
i2d_PUBKEY(const EVP_PKEY * a,unsigned char ** pp)206 int i2d_PUBKEY(const EVP_PKEY *a, unsigned char **pp)
207 {
208 X509_PUBKEY *xpk = NULL;
209 int ret;
210 if (!a)
211 return 0;
212 if (!X509_PUBKEY_set(&xpk, (EVP_PKEY *)a))
213 return 0;
214 ret = i2d_X509_PUBKEY(xpk, pp);
215 X509_PUBKEY_free(xpk);
216 return ret;
217 }
218
219 /*
220 * The following are equivalents but which return RSA and DSA keys
221 */
d2i_RSA_PUBKEY(RSA ** a,const unsigned char ** pp,long length)222 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
223 {
224 EVP_PKEY *pkey;
225 RSA *key;
226 const unsigned char *q;
227 q = *pp;
228 pkey = d2i_PUBKEY(NULL, &q, length);
229 if (!pkey)
230 return NULL;
231 key = EVP_PKEY_get1_RSA(pkey);
232 EVP_PKEY_free(pkey);
233 if (!key)
234 return NULL;
235 *pp = q;
236 if (a) {
237 RSA_free(*a);
238 *a = key;
239 }
240 return key;
241 }
242
i2d_RSA_PUBKEY(const RSA * a,unsigned char ** pp)243 int i2d_RSA_PUBKEY(const RSA *a, unsigned char **pp)
244 {
245 EVP_PKEY *pktmp;
246 int ret;
247 if (!a)
248 return 0;
249 pktmp = EVP_PKEY_new();
250 if (!pktmp) {
251 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
252 return 0;
253 }
254 EVP_PKEY_set1_RSA(pktmp, (RSA *)a);
255 ret = i2d_PUBKEY(pktmp, pp);
256 EVP_PKEY_free(pktmp);
257 return ret;
258 }
259
260 #ifndef OPENSSL_NO_DSA
d2i_DSA_PUBKEY(DSA ** a,const unsigned char ** pp,long length)261 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
262 {
263 EVP_PKEY *pkey;
264 DSA *key;
265 const unsigned char *q;
266 q = *pp;
267 pkey = d2i_PUBKEY(NULL, &q, length);
268 if (!pkey)
269 return NULL;
270 key = EVP_PKEY_get1_DSA(pkey);
271 EVP_PKEY_free(pkey);
272 if (!key)
273 return NULL;
274 *pp = q;
275 if (a) {
276 DSA_free(*a);
277 *a = key;
278 }
279 return key;
280 }
281
i2d_DSA_PUBKEY(const DSA * a,unsigned char ** pp)282 int i2d_DSA_PUBKEY(const DSA *a, unsigned char **pp)
283 {
284 EVP_PKEY *pktmp;
285 int ret;
286 if (!a)
287 return 0;
288 pktmp = EVP_PKEY_new();
289 if (!pktmp) {
290 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
291 return 0;
292 }
293 EVP_PKEY_set1_DSA(pktmp, (DSA *)a);
294 ret = i2d_PUBKEY(pktmp, pp);
295 EVP_PKEY_free(pktmp);
296 return ret;
297 }
298 #endif
299
d2i_EC_PUBKEY(EC_KEY ** a,const unsigned char ** pp,long length)300 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
301 {
302 EVP_PKEY *pkey;
303 EC_KEY *key;
304 const unsigned char *q;
305 q = *pp;
306 pkey = d2i_PUBKEY(NULL, &q, length);
307 if (!pkey)
308 return (NULL);
309 key = EVP_PKEY_get1_EC_KEY(pkey);
310 EVP_PKEY_free(pkey);
311 if (!key)
312 return (NULL);
313 *pp = q;
314 if (a) {
315 EC_KEY_free(*a);
316 *a = key;
317 }
318 return (key);
319 }
320
i2d_EC_PUBKEY(const EC_KEY * a,unsigned char ** pp)321 int i2d_EC_PUBKEY(const EC_KEY *a, unsigned char **pp)
322 {
323 EVP_PKEY *pktmp;
324 int ret;
325 if (!a)
326 return (0);
327 if ((pktmp = EVP_PKEY_new()) == NULL) {
328 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
329 return (0);
330 }
331 EVP_PKEY_set1_EC_KEY(pktmp, (EC_KEY *)a);
332 ret = i2d_PUBKEY(pktmp, pp);
333 EVP_PKEY_free(pktmp);
334 return (ret);
335 }
336
X509_PUBKEY_set0_param(X509_PUBKEY * pub,const ASN1_OBJECT * aobj,int ptype,void * pval,unsigned char * penc,int penclen)337 int X509_PUBKEY_set0_param(X509_PUBKEY *pub, const ASN1_OBJECT *aobj,
338 int ptype, void *pval,
339 unsigned char *penc, int penclen)
340 {
341 if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
342 return 0;
343 if (penc) {
344 if (pub->public_key->data)
345 OPENSSL_free(pub->public_key->data);
346 pub->public_key->data = penc;
347 pub->public_key->length = penclen;
348 /* Set number of unused bits to zero */
349 pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
350 pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
351 }
352 return 1;
353 }
354
X509_PUBKEY_get0_param(ASN1_OBJECT ** ppkalg,const unsigned char ** pk,int * ppklen,X509_ALGOR ** pa,X509_PUBKEY * pub)355 int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
356 const unsigned char **pk, int *ppklen,
357 X509_ALGOR **pa, X509_PUBKEY *pub)
358 {
359 if (ppkalg)
360 *ppkalg = pub->algor->algorithm;
361 if (pk) {
362 *pk = pub->public_key->data;
363 *ppklen = pub->public_key->length;
364 }
365 if (pa)
366 *pa = pub->algor;
367 return 1;
368 }
369