• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /* crypto/asn1/x_x509.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  *
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  *
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  *
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  *
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  *
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.] */
57 
58 #include <assert.h>
59 #include <limits.h>
60 #include <stdio.h>
61 
62 #include <openssl/asn1t.h>
63 #include <openssl/evp.h>
64 #include <openssl/mem.h>
65 #include <openssl/obj.h>
66 #include <openssl/pool.h>
67 #include <openssl/thread.h>
68 #include <openssl/x509.h>
69 #include <openssl/x509v3.h>
70 
71 #include "../internal.h"
72 
73 static CRYPTO_EX_DATA_CLASS g_ex_data_class = CRYPTO_EX_DATA_CLASS_INIT;
74 
75 ASN1_SEQUENCE_enc(X509_CINF, enc, 0) = {
76         ASN1_EXP_OPT(X509_CINF, version, ASN1_INTEGER, 0),
77         ASN1_SIMPLE(X509_CINF, serialNumber, ASN1_INTEGER),
78         ASN1_SIMPLE(X509_CINF, signature, X509_ALGOR),
79         ASN1_SIMPLE(X509_CINF, issuer, X509_NAME),
80         ASN1_SIMPLE(X509_CINF, validity, X509_VAL),
81         ASN1_SIMPLE(X509_CINF, subject, X509_NAME),
82         ASN1_SIMPLE(X509_CINF, key, X509_PUBKEY),
83         ASN1_IMP_OPT(X509_CINF, issuerUID, ASN1_BIT_STRING, 1),
84         ASN1_IMP_OPT(X509_CINF, subjectUID, ASN1_BIT_STRING, 2),
85         ASN1_EXP_SEQUENCE_OF_OPT(X509_CINF, extensions, X509_EXTENSION, 3)
86 } ASN1_SEQUENCE_END_enc(X509_CINF, X509_CINF)
87 
88 IMPLEMENT_ASN1_FUNCTIONS(X509_CINF)
89 /* X509 top level structure needs a bit of customisation */
90 
91 extern void policy_cache_free(X509_POLICY_CACHE *cache);
92 
x509_cb(int operation,ASN1_VALUE ** pval,const ASN1_ITEM * it,void * exarg)93 static int x509_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
94                    void *exarg)
95 {
96     X509 *ret = (X509 *)*pval;
97 
98     switch (operation) {
99 
100     case ASN1_OP_NEW_POST:
101         ret->name = NULL;
102         ret->ex_flags = 0;
103         ret->ex_pathlen = -1;
104         ret->skid = NULL;
105         ret->akid = NULL;
106         ret->aux = NULL;
107         ret->crldp = NULL;
108         ret->buf = NULL;
109         CRYPTO_new_ex_data(&ret->ex_data);
110         CRYPTO_MUTEX_init(&ret->lock);
111         break;
112 
113     case ASN1_OP_D2I_PRE:
114         CRYPTO_BUFFER_free(ret->buf);
115         ret->buf = NULL;
116         break;
117 
118     case ASN1_OP_D2I_POST:
119         if (ret->name != NULL)
120             OPENSSL_free(ret->name);
121         ret->name = X509_NAME_oneline(ret->cert_info->subject, NULL, 0);
122         break;
123 
124     case ASN1_OP_FREE_POST:
125         CRYPTO_MUTEX_cleanup(&ret->lock);
126         CRYPTO_free_ex_data(&g_ex_data_class, ret, &ret->ex_data);
127         X509_CERT_AUX_free(ret->aux);
128         ASN1_OCTET_STRING_free(ret->skid);
129         AUTHORITY_KEYID_free(ret->akid);
130         CRL_DIST_POINTS_free(ret->crldp);
131         policy_cache_free(ret->policy_cache);
132         GENERAL_NAMES_free(ret->altname);
133         NAME_CONSTRAINTS_free(ret->nc);
134         CRYPTO_BUFFER_free(ret->buf);
135         OPENSSL_free(ret->name);
136         break;
137 
138     }
139 
140     return 1;
141 
142 }
143 
144 ASN1_SEQUENCE_ref(X509, x509_cb) = {
145         ASN1_SIMPLE(X509, cert_info, X509_CINF),
146         ASN1_SIMPLE(X509, sig_alg, X509_ALGOR),
147         ASN1_SIMPLE(X509, signature, ASN1_BIT_STRING)
148 } ASN1_SEQUENCE_END_ref(X509, X509)
149 
150 IMPLEMENT_ASN1_FUNCTIONS(X509)
151 
152 IMPLEMENT_ASN1_DUP_FUNCTION(X509)
153 
154 X509 *X509_parse_from_buffer(CRYPTO_BUFFER *buf) {
155   if (CRYPTO_BUFFER_len(buf) > LONG_MAX) {
156     OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
157     return 0;
158   }
159 
160   X509 *x509 = X509_new();
161   if (x509 == NULL) {
162     return NULL;
163   }
164 
165   x509->cert_info->enc.alias_only_on_next_parse = 1;
166 
167   const uint8_t *inp = CRYPTO_BUFFER_data(buf);
168   X509 *x509p = x509;
169   X509 *ret = d2i_X509(&x509p, &inp, CRYPTO_BUFFER_len(buf));
170   if (ret == NULL ||
171       inp - CRYPTO_BUFFER_data(buf) != (ptrdiff_t)CRYPTO_BUFFER_len(buf)) {
172     X509_free(x509p);
173     return NULL;
174   }
175   assert(x509p == x509);
176   assert(ret == x509);
177 
178   CRYPTO_BUFFER_up_ref(buf);
179   ret->buf = buf;
180 
181   return ret;
182 }
183 
X509_up_ref(X509 * x)184 int X509_up_ref(X509 *x)
185 {
186     CRYPTO_refcount_inc(&x->references);
187     return 1;
188 }
189 
X509_get_ex_new_index(long argl,void * argp,CRYPTO_EX_unused * unused,CRYPTO_EX_dup * dup_unused,CRYPTO_EX_free * free_func)190 int X509_get_ex_new_index(long argl, void *argp, CRYPTO_EX_unused * unused,
191                           CRYPTO_EX_dup *dup_unused, CRYPTO_EX_free *free_func)
192 {
193     int index;
194     if (!CRYPTO_get_ex_new_index(&g_ex_data_class, &index, argl, argp,
195                                  free_func)) {
196         return -1;
197     }
198     return index;
199 }
200 
X509_set_ex_data(X509 * r,int idx,void * arg)201 int X509_set_ex_data(X509 *r, int idx, void *arg)
202 {
203     return (CRYPTO_set_ex_data(&r->ex_data, idx, arg));
204 }
205 
X509_get_ex_data(X509 * r,int idx)206 void *X509_get_ex_data(X509 *r, int idx)
207 {
208     return (CRYPTO_get_ex_data(&r->ex_data, idx));
209 }
210 
211 /*
212  * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with
213  * extra info tagged on the end. Since these functions set how a certificate
214  * is trusted they should only be used when the certificate comes from a
215  * reliable source such as local storage.
216  */
217 
d2i_X509_AUX(X509 ** a,const unsigned char ** pp,long length)218 X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length)
219 {
220     const unsigned char *q = *pp;
221     X509 *ret;
222     int freeret = 0;
223 
224     if (!a || *a == NULL)
225         freeret = 1;
226     ret = d2i_X509(a, &q, length);
227     /* If certificate unreadable then forget it */
228     if (!ret)
229         return NULL;
230     /* update length */
231     length -= q - *pp;
232     /* Parse auxiliary information if there is any. */
233     if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length))
234         goto err;
235     *pp = q;
236     return ret;
237  err:
238     if (freeret) {
239         X509_free(ret);
240         if (a)
241             *a = NULL;
242     }
243     return NULL;
244 }
245 
246 /*
247  * Serialize trusted certificate to *pp or just return the required buffer
248  * length if pp == NULL.  We ultimately want to avoid modifying *pp in the
249  * error path, but that depends on similar hygiene in lower-level functions.
250  * Here we avoid compounding the problem.
251  */
i2d_x509_aux_internal(X509 * a,unsigned char ** pp)252 static int i2d_x509_aux_internal(X509 *a, unsigned char **pp)
253 {
254     int length, tmplen;
255     unsigned char *start = pp != NULL ? *pp : NULL;
256 
257     assert(pp == NULL || *pp != NULL);
258 
259     /*
260      * This might perturb *pp on error, but fixing that belongs in i2d_X509()
261      * not here.  It should be that if a == NULL length is zero, but we check
262      * both just in case.
263      */
264     length = i2d_X509(a, pp);
265     if (length <= 0 || a == NULL) {
266         return length;
267     }
268 
269     tmplen = i2d_X509_CERT_AUX(a->aux, pp);
270     if (tmplen < 0) {
271         if (start != NULL)
272             *pp = start;
273         return tmplen;
274     }
275     length += tmplen;
276 
277     return length;
278 }
279 
280 /*
281  * Serialize trusted certificate to *pp, or just return the required buffer
282  * length if pp == NULL.
283  *
284  * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since
285  * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do
286  * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the
287  * allocated buffer.
288  */
i2d_X509_AUX(X509 * a,unsigned char ** pp)289 int i2d_X509_AUX(X509 *a, unsigned char **pp)
290 {
291     int length;
292     unsigned char *tmp;
293 
294     /* Buffer provided by caller */
295     if (pp == NULL || *pp != NULL)
296         return i2d_x509_aux_internal(a, pp);
297 
298     /* Obtain the combined length */
299     if ((length = i2d_x509_aux_internal(a, NULL)) <= 0)
300         return length;
301 
302     /* Allocate requisite combined storage */
303     *pp = tmp = OPENSSL_malloc(length);
304     if (tmp == NULL)
305         return -1; /* Push error onto error stack? */
306 
307     /* Encode, but keep *pp at the originally malloced pointer */
308     length = i2d_x509_aux_internal(a, &tmp);
309     if (length <= 0) {
310         OPENSSL_free(*pp);
311         *pp = NULL;
312     }
313     return length;
314 }
315 
i2d_re_X509_tbs(X509 * x,unsigned char ** pp)316 int i2d_re_X509_tbs(X509 *x, unsigned char **pp)
317 {
318     x->cert_info->enc.modified = 1;
319     return i2d_X509_CINF(x->cert_info, pp);
320 }
321 
X509_get0_signature(const ASN1_BIT_STRING ** psig,const X509_ALGOR ** palg,const X509 * x)322 void X509_get0_signature(const ASN1_BIT_STRING **psig, const X509_ALGOR **palg,
323                          const X509 *x)
324 {
325     if (psig)
326         *psig = x->signature;
327     if (palg)
328         *palg = x->sig_alg;
329 }
330 
X509_get_signature_nid(const X509 * x)331 int X509_get_signature_nid(const X509 *x)
332 {
333     return OBJ_obj2nid(x->sig_alg->algorithm);
334 }
335