1/*
2 * Copyright 1995-2018 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
18ASN1_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
31IMPLEMENT_ASN1_FUNCTIONS(X509_CINF)
32/* X509 top level structure needs a bit of customisation */
33
34extern void policy_cache_free(X509_POLICY_CACHE *cache);
35
36static 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 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#ifndef OPENSSL_NO_SM2
57 ASN1_OCTET_STRING_free(ret->sm2_id);
58#endif
59
60 /* fall thru */
61
62 case ASN1_OP_NEW_POST:
63 ret->ex_cached = 0;
64 ret->ex_kusage = 0;
65 ret->ex_xkusage = 0;
66 ret->ex_nscert = 0;
67 ret->ex_flags = 0;
68 ret->ex_pathlen = -1;
69 ret->ex_pcpathlen = -1;
70 ret->skid = NULL;
71 ret->akid = NULL;
72 ret->policy_cache = NULL;
73 ret->altname = NULL;
74 ret->nc = NULL;
75#ifndef OPENSSL_NO_RFC3779
76 ret->rfc3779_addr = NULL;
77 ret->rfc3779_asid = NULL;
78#endif
79#ifndef OPENSSL_NO_SM2
80 ret->sm2_id = NULL;
81#endif
82 ret->aux = NULL;
83 ret->crldp = NULL;
84 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data))
85 return 0;
86 break;
87
88 case ASN1_OP_FREE_POST:
89 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data);
90 X509_CERT_AUX_free(ret->aux);
91 ASN1_OCTET_STRING_free(ret->skid);
92 AUTHORITY_KEYID_free(ret->akid);
93 CRL_DIST_POINTS_free(ret->crldp);
94 policy_cache_free(ret->policy_cache);
95 GENERAL_NAMES_free(ret->altname);
96 NAME_CONSTRAINTS_free(ret->nc);
97#ifndef OPENSSL_NO_RFC3779
98 sk_IPAddressFamily_pop_free(ret->rfc3779_addr, IPAddressFamily_free);
99 ASIdentifiers_free(ret->rfc3779_asid);
100#endif
101#ifndef OPENSSL_NO_SM2
102 ASN1_OCTET_STRING_free(ret->sm2_id);
103#endif
104 break;
105
106 }
107
108 return 1;
109
110}
111
112ASN1_SEQUENCE_ref(X509, x509_cb) = {
113 ASN1_EMBED(X509, cert_info, X509_CINF),
114 ASN1_EMBED(X509, sig_alg, X509_ALGOR),
115 ASN1_EMBED(X509, signature, ASN1_BIT_STRING)
116} ASN1_SEQUENCE_END_ref(X509, X509)
117
118IMPLEMENT_ASN1_FUNCTIONS(X509)
119IMPLEMENT_ASN1_DUP_FUNCTION(X509)
120
121int X509_set_ex_data(X509 *r, int idx, void *arg)
122{
123 return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
124}
125
126void *X509_get_ex_data(X509 *r, int idx)
127{
128 return CRYPTO_get_ex_data(&r->ex_data, idx);
129}
130
131/*
132 * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with
133 * extra info tagged on the end. Since these functions set how a certificate
134 * is trusted they should only be used when the certificate comes from a
135 * reliable source such as local storage.
136 */
137
138X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length)
139{
140 const unsigned char *q;
141 X509 *ret;
142 int freeret = 0;
143
144 /* Save start position */
145 q = *pp;
146
147 if (a == NULL || *a == NULL)
148 freeret = 1;
149 ret = d2i_X509(a, &q, length);
150 /* If certificate unreadable then forget it */
151 if (ret == NULL)
152 return NULL;
153 /* update length */
154 length -= q - *pp;
155 if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length))
156 goto err;
157 *pp = q;
158 return ret;
159 err:
160 if (freeret) {
161 X509_free(ret);
162 if (a)
163 *a = NULL;
164 }
165 return NULL;
166}
167
168/*
169 * Serialize trusted certificate to *pp or just return the required buffer
170 * length if pp == NULL. We ultimately want to avoid modifying *pp in the
171 * error path, but that depends on similar hygiene in lower-level functions.
172 * Here we avoid compounding the problem.
173 */
174static int i2d_x509_aux_internal(const X509 *a, unsigned char **pp)
175{
176 int length, tmplen;
177 unsigned char *start = pp != NULL ? *pp : NULL;
178
179 /*
180 * This might perturb *pp on error, but fixing that belongs in i2d_X509()
181 * not here. It should be that if a == NULL length is zero, but we check
182 * both just in case.
183 */
184 length = i2d_X509(a, pp);
185 if (length <= 0 || a == NULL)
186 return length;
187
188 tmplen = i2d_X509_CERT_AUX(a->aux, pp);
189 if (tmplen < 0) {
190 if (start != NULL)
191 *pp = start;
192 return tmplen;
193 }
194 length += tmplen;
195
196 return length;
197}
198
199/*
200 * Serialize trusted certificate to *pp, or just return the required buffer
201 * length if pp == NULL.
202 *
203 * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since
204 * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do
205 * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the
206 * allocated buffer.
207 */
208int i2d_X509_AUX(const X509 *a, unsigned char **pp)
209{
210 int length;
211 unsigned char *tmp;
212
213 /* Buffer provided by caller */
214 if (pp == NULL || *pp != NULL)
215 return i2d_x509_aux_internal(a, pp);
216
217 /* Obtain the combined length */
218 if ((length = i2d_x509_aux_internal(a, NULL)) <= 0)
219 return length;
220
221 /* Allocate requisite combined storage */
222 *pp = tmp = OPENSSL_malloc(length);
223 if (tmp == NULL) {
224 X509err(X509_F_I2D_X509_AUX, ERR_R_MALLOC_FAILURE);
225 return -1;
226 }
227
228 /* Encode, but keep *pp at the originally malloced pointer */
229 length = i2d_x509_aux_internal(a, &tmp);
230 if (length <= 0) {
231 OPENSSL_free(*pp);
232 *pp = NULL;
233 }
234 return length;
235}
236
237int i2d_re_X509_tbs(X509 *x, unsigned char **pp)
238{
239 x->cert_info.enc.modified = 1;
240 return i2d_X509_CINF(&x->cert_info, pp);
241}
242
243void X509_get0_signature(const ASN1_BIT_STRING **psig,
244 const X509_ALGOR **palg, const X509 *x)
245{
246 if (psig)
247 *psig = &x->signature;
248 if (palg)
249 *palg = &x->sig_alg;
250}
251
252int X509_get_signature_nid(const X509 *x)
253{
254 return OBJ_obj2nid(x->sig_alg.algorithm);
255}
256
257#ifndef OPENSSL_NO_SM2
258void X509_set0_sm2_id(X509 *x, ASN1_OCTET_STRING *sm2_id)
259{
260 ASN1_OCTET_STRING_free(x->sm2_id);
261 x->sm2_id = sm2_id;
262}
263
264ASN1_OCTET_STRING *X509_get0_sm2_id(X509 *x)
265{
266 return x->sm2_id;
267}
268#endif
269