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