1 /*
2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/evp.h>
13 #include <openssl/asn1t.h>
14 #include <openssl/x509.h>
15 #include <openssl/x509v3.h>
16 #include "crypto/x509.h"
17
18 ASN1_SEQUENCE_enc(X509_CINF, enc, 0) = {
19 ASN1_EXP_OPT(X509_CINF, version, ASN1_INTEGER, 0),
20 ASN1_EMBED(X509_CINF, serialNumber, ASN1_INTEGER),
21 ASN1_EMBED(X509_CINF, signature, X509_ALGOR),
22 ASN1_SIMPLE(X509_CINF, issuer, X509_NAME),
23 ASN1_EMBED(X509_CINF, validity, X509_VAL),
24 ASN1_SIMPLE(X509_CINF, subject, X509_NAME),
25 ASN1_SIMPLE(X509_CINF, key, X509_PUBKEY),
26 ASN1_IMP_OPT(X509_CINF, issuerUID, ASN1_BIT_STRING, 1),
27 ASN1_IMP_OPT(X509_CINF, subjectUID, ASN1_BIT_STRING, 2),
28 ASN1_EXP_SEQUENCE_OF_OPT(X509_CINF, extensions, X509_EXTENSION, 3)
29 } ASN1_SEQUENCE_END_enc(X509_CINF, X509_CINF)
30
31 IMPLEMENT_ASN1_FUNCTIONS(X509_CINF)
32 /* X509 top level structure needs a bit of customisation */
33
34 extern void ossl_policy_cache_free(X509_POLICY_CACHE *cache);
35
x509_cb(int operation,ASN1_VALUE ** pval,const ASN1_ITEM * it,void * exarg)36 static int x509_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
37 void *exarg)
38 {
39 X509 *ret = (X509 *)*pval;
40
41 switch (operation) {
42
43 case ASN1_OP_D2I_PRE:
44 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data);
45 X509_CERT_AUX_free(ret->aux);
46 ASN1_OCTET_STRING_free(ret->skid);
47 AUTHORITY_KEYID_free(ret->akid);
48 CRL_DIST_POINTS_free(ret->crldp);
49 ossl_policy_cache_free(ret->policy_cache);
50 GENERAL_NAMES_free(ret->altname);
51 NAME_CONSTRAINTS_free(ret->nc);
52 #ifndef OPENSSL_NO_RFC3779
53 sk_IPAddressFamily_pop_free(ret->rfc3779_addr, IPAddressFamily_free);
54 ASIdentifiers_free(ret->rfc3779_asid);
55 #endif
56 ASN1_OCTET_STRING_free(ret->distinguishing_id);
57
58 /* fall through */
59
60 case ASN1_OP_NEW_POST:
61 ret->ex_cached = 0;
62 ret->ex_kusage = 0;
63 ret->ex_xkusage = 0;
64 ret->ex_nscert = 0;
65 ret->ex_flags = 0;
66 ret->ex_pathlen = -1;
67 ret->ex_pcpathlen = -1;
68 ret->skid = NULL;
69 ret->akid = NULL;
70 ret->policy_cache = NULL;
71 ret->altname = NULL;
72 ret->nc = NULL;
73 #ifndef OPENSSL_NO_RFC3779
74 ret->rfc3779_addr = NULL;
75 ret->rfc3779_asid = NULL;
76 #endif
77 ret->distinguishing_id = NULL;
78 ret->aux = NULL;
79 ret->crldp = NULL;
80 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data))
81 return 0;
82 break;
83
84 case ASN1_OP_FREE_POST:
85 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data);
86 X509_CERT_AUX_free(ret->aux);
87 ASN1_OCTET_STRING_free(ret->skid);
88 AUTHORITY_KEYID_free(ret->akid);
89 CRL_DIST_POINTS_free(ret->crldp);
90 ossl_policy_cache_free(ret->policy_cache);
91 GENERAL_NAMES_free(ret->altname);
92 NAME_CONSTRAINTS_free(ret->nc);
93 #ifndef OPENSSL_NO_RFC3779
94 sk_IPAddressFamily_pop_free(ret->rfc3779_addr, IPAddressFamily_free);
95 ASIdentifiers_free(ret->rfc3779_asid);
96 #endif
97 ASN1_OCTET_STRING_free(ret->distinguishing_id);
98 OPENSSL_free(ret->propq);
99 break;
100
101 case ASN1_OP_DUP_POST:
102 {
103 X509 *old = exarg;
104
105 if (!ossl_x509_set0_libctx(ret, old->libctx, old->propq))
106 return 0;
107 }
108 break;
109 case ASN1_OP_GET0_LIBCTX:
110 {
111 OSSL_LIB_CTX **libctx = exarg;
112
113 *libctx = ret->libctx;
114 }
115 break;
116
117 case ASN1_OP_GET0_PROPQ:
118 {
119 const char **propq = exarg;
120
121 *propq = ret->propq;
122 }
123 break;
124
125 default:
126 break;
127 }
128
129 return 1;
130 }
131
132 ASN1_SEQUENCE_ref(X509, x509_cb) = {
133 ASN1_EMBED(X509, cert_info, X509_CINF),
134 ASN1_EMBED(X509, sig_alg, X509_ALGOR),
135 ASN1_EMBED(X509, signature, ASN1_BIT_STRING)
136 } ASN1_SEQUENCE_END_ref(X509, X509)
137
138 IMPLEMENT_ASN1_FUNCTIONS(X509)
139 IMPLEMENT_ASN1_DUP_FUNCTION(X509)
140
141 /*
142 * This should only be used if the X509 object was embedded inside another
143 * asn1 object and it needs a libctx to operate.
144 * Use X509_new_ex() instead if possible.
145 */
146 int ossl_x509_set0_libctx(X509 *x, OSSL_LIB_CTX *libctx, const char *propq)
147 {
148 if (x != NULL) {
149 x->libctx = libctx;
150 OPENSSL_free(x->propq);
151 x->propq = NULL;
152 if (propq != NULL) {
153 x->propq = OPENSSL_strdup(propq);
154 if (x->propq == NULL)
155 return 0;
156 }
157 }
158 return 1;
159 }
160
X509_new_ex(OSSL_LIB_CTX * libctx,const char * propq)161 X509 *X509_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
162 {
163 X509 *cert = NULL;
164
165 cert = (X509 *)ASN1_item_new_ex(X509_it(), libctx, propq);
166 if (!ossl_x509_set0_libctx(cert, libctx, propq)) {
167 X509_free(cert);
168 cert = NULL;
169 }
170 return cert;
171 }
172
X509_set_ex_data(X509 * r,int idx,void * arg)173 int X509_set_ex_data(X509 *r, int idx, void *arg)
174 {
175 return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
176 }
177
X509_get_ex_data(const X509 * r,int idx)178 void *X509_get_ex_data(const X509 *r, int idx)
179 {
180 return CRYPTO_get_ex_data(&r->ex_data, idx);
181 }
182
183 /*
184 * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with
185 * extra info tagged on the end. Since these functions set how a certificate
186 * is trusted they should only be used when the certificate comes from a
187 * reliable source such as local storage.
188 */
189
d2i_X509_AUX(X509 ** a,const unsigned char ** pp,long length)190 X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length)
191 {
192 const unsigned char *q;
193 X509 *ret;
194 int freeret = 0;
195
196 /* Save start position */
197 q = *pp;
198
199 if (a == NULL || *a == NULL)
200 freeret = 1;
201 ret = d2i_X509(a, &q, length);
202 /* If certificate unreadable then forget it */
203 if (ret == NULL)
204 return NULL;
205 /* update length */
206 length -= q - *pp;
207 if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length))
208 goto err;
209 *pp = q;
210 return ret;
211 err:
212 if (freeret) {
213 X509_free(ret);
214 if (a)
215 *a = NULL;
216 }
217 return NULL;
218 }
219
220 /*
221 * Serialize trusted certificate to *pp or just return the required buffer
222 * length if pp == NULL. We ultimately want to avoid modifying *pp in the
223 * error path, but that depends on similar hygiene in lower-level functions.
224 * Here we avoid compounding the problem.
225 */
i2d_x509_aux_internal(const X509 * a,unsigned char ** pp)226 static int i2d_x509_aux_internal(const X509 *a, unsigned char **pp)
227 {
228 int length, tmplen;
229 unsigned char *start = pp != NULL ? *pp : NULL;
230
231 /*
232 * This might perturb *pp on error, but fixing that belongs in i2d_X509()
233 * not here. It should be that if a == NULL length is zero, but we check
234 * both just in case.
235 */
236 length = i2d_X509(a, pp);
237 if (length <= 0 || a == NULL)
238 return length;
239
240 tmplen = i2d_X509_CERT_AUX(a->aux, pp);
241 if (tmplen < 0) {
242 if (start != NULL)
243 *pp = start;
244 return tmplen;
245 }
246 length += tmplen;
247
248 return length;
249 }
250
251 /*
252 * Serialize trusted certificate to *pp, or just return the required buffer
253 * length if pp == NULL.
254 *
255 * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since
256 * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do
257 * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the
258 * allocated buffer.
259 */
i2d_X509_AUX(const X509 * a,unsigned char ** pp)260 int i2d_X509_AUX(const X509 *a, unsigned char **pp)
261 {
262 int length;
263 unsigned char *tmp;
264
265 /* Buffer provided by caller */
266 if (pp == NULL || *pp != NULL)
267 return i2d_x509_aux_internal(a, pp);
268
269 /* Obtain the combined length */
270 if ((length = i2d_x509_aux_internal(a, NULL)) <= 0)
271 return length;
272
273 /* Allocate requisite combined storage */
274 *pp = tmp = OPENSSL_malloc(length);
275 if (tmp == NULL)
276 return -1;
277
278 /* Encode, but keep *pp at the originally malloced pointer */
279 length = i2d_x509_aux_internal(a, &tmp);
280 if (length <= 0) {
281 OPENSSL_free(*pp);
282 *pp = NULL;
283 }
284 return length;
285 }
286
i2d_re_X509_tbs(X509 * x,unsigned char ** pp)287 int i2d_re_X509_tbs(X509 *x, unsigned char **pp)
288 {
289 x->cert_info.enc.modified = 1;
290 return i2d_X509_CINF(&x->cert_info, pp);
291 }
292
X509_get0_signature(const ASN1_BIT_STRING ** psig,const X509_ALGOR ** palg,const X509 * x)293 void X509_get0_signature(const ASN1_BIT_STRING **psig,
294 const X509_ALGOR **palg, const X509 *x)
295 {
296 if (psig)
297 *psig = &x->signature;
298 if (palg)
299 *palg = &x->sig_alg;
300 }
301
X509_get_signature_nid(const X509 * x)302 int X509_get_signature_nid(const X509 *x)
303 {
304 return OBJ_obj2nid(x->sig_alg.algorithm);
305 }
306
X509_set0_distinguishing_id(X509 * x,ASN1_OCTET_STRING * d_id)307 void X509_set0_distinguishing_id(X509 *x, ASN1_OCTET_STRING *d_id)
308 {
309 ASN1_OCTET_STRING_free(x->distinguishing_id);
310 x->distinguishing_id = d_id;
311 }
312
X509_get0_distinguishing_id(X509 * x)313 ASN1_OCTET_STRING *X509_get0_distinguishing_id(X509 *x)
314 {
315 return x->distinguishing_id;
316 }
317
