crypto/x509/x_x509.c

   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 "internal/x509_int.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 policy_cache_free(X509_POLICY_CACHE *cache);
  35
  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         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
 112 ASN1_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
 118 IMPLEMENT_ASN1_FUNCTIONS(X509)
 119 IMPLEMENT_ASN1_DUP_FUNCTION(X509)
 120
 121 int X509_set_ex_data(X509 *r, int idx, void *arg)
 122 {
 123     return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
 124 }
 125
 126 void *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
 138 X509 *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  */
 174 static 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  */
 208 int 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
 237 int 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
 243 void 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
 252 int X509_get_signature_nid(const X509 *x)
 253 {
 254     return OBJ_obj2nid(x->sig_alg.algorithm);
 255 }
 256
 257 #ifndef OPENSSL_NO_SM2
 258 void 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
 264 ASN1_OCTET_STRING *X509_get0_sm2_id(X509 *x)
 265 {
 266     return x->sm2_id;
 267 }
 268 #endif