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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