xref: /openssl/crypto/x509/x_x509.c (revision c7340583)
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