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 "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 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         ASN1_OCTET_STRING_free(ret->distinguishing_id);
  57
  58         /* fall thru */
  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         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         break;
  99
 100     }
 101
 102     return 1;
 103
 104 }
 105
 106 ASN1_SEQUENCE_ref(X509, x509_cb) = {
 107         ASN1_EMBED(X509, cert_info, X509_CINF),
 108         ASN1_EMBED(X509, sig_alg, X509_ALGOR),
 109         ASN1_EMBED(X509, signature, ASN1_BIT_STRING)
 110 } ASN1_SEQUENCE_END_ref(X509, X509)
 111
 112 IMPLEMENT_ASN1_FUNCTIONS(X509)
 113 IMPLEMENT_ASN1_DUP_FUNCTION(X509)
 114
 115 int X509_set_ex_data(X509 *r, int idx, void *arg)
 116 {
 117     return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
 118 }
 119
 120 void *X509_get_ex_data(const X509 *r, int idx)
 121 {
 122     return CRYPTO_get_ex_data(&r->ex_data, idx);
 123 }
 124
 125 /*
 126  * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with
 127  * extra info tagged on the end. Since these functions set how a certificate
 128  * is trusted they should only be used when the certificate comes from a
 129  * reliable source such as local storage.
 130  */
 131
 132 X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length)
 133 {
 134     const unsigned char *q;
 135     X509 *ret;
 136     int freeret = 0;
 137
 138     /* Save start position */
 139     q = *pp;
 140
 141     if (a == NULL || *a == NULL)
 142         freeret = 1;
 143     ret = d2i_X509(a, &q, length);
 144     /* If certificate unreadable then forget it */
 145     if (ret == NULL)
 146         return NULL;
 147     /* update length */
 148     length -= q - *pp;
 149     if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length))
 150         goto err;
 151     *pp = q;
 152     return ret;
 153  err:
 154     if (freeret) {
 155         X509_free(ret);
 156         if (a)
 157             *a = NULL;
 158     }
 159     return NULL;
 160 }
 161
 162 /*
 163  * Serialize trusted certificate to *pp or just return the required buffer
 164  * length if pp == NULL.  We ultimately want to avoid modifying *pp in the
 165  * error path, but that depends on similar hygiene in lower-level functions.
 166  * Here we avoid compounding the problem.
 167  */
 168 static int i2d_x509_aux_internal(const X509 *a, unsigned char **pp)
 169 {
 170     int length, tmplen;
 171     unsigned char *start = pp != NULL ? *pp : NULL;
 172
 173     /*
 174      * This might perturb *pp on error, but fixing that belongs in i2d_X509()
 175      * not here.  It should be that if a == NULL length is zero, but we check
 176      * both just in case.
 177      */
 178     length = i2d_X509(a, pp);
 179     if (length <= 0 || a == NULL)
 180         return length;
 181
 182     tmplen = i2d_X509_CERT_AUX(a->aux, pp);
 183     if (tmplen < 0) {
 184         if (start != NULL)
 185             *pp = start;
 186         return tmplen;
 187     }
 188     length += tmplen;
 189
 190     return length;
 191 }
 192
 193 /*
 194  * Serialize trusted certificate to *pp, or just return the required buffer
 195  * length if pp == NULL.
 196  *
 197  * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since
 198  * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do
 199  * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the
 200  * allocated buffer.
 201  */
 202 int i2d_X509_AUX(const X509 *a, unsigned char **pp)
 203 {
 204     int length;
 205     unsigned char *tmp;
 206
 207     /* Buffer provided by caller */
 208     if (pp == NULL || *pp != NULL)
 209         return i2d_x509_aux_internal(a, pp);
 210
 211     /* Obtain the combined length */
 212     if ((length = i2d_x509_aux_internal(a, NULL)) <= 0)
 213         return length;
 214
 215     /* Allocate requisite combined storage */
 216     *pp = tmp = OPENSSL_malloc(length);
 217     if (tmp == NULL) {
 218         X509err(X509_F_I2D_X509_AUX, ERR_R_MALLOC_FAILURE);
 219         return -1;
 220     }
 221
 222     /* Encode, but keep *pp at the originally malloced pointer */
 223     length = i2d_x509_aux_internal(a, &tmp);
 224     if (length <= 0) {
 225         OPENSSL_free(*pp);
 226         *pp = NULL;
 227     }
 228     return length;
 229 }
 230
 231 int i2d_re_X509_tbs(X509 *x, unsigned char **pp)
 232 {
 233     x->cert_info.enc.modified = 1;
 234     return i2d_X509_CINF(&x->cert_info, pp);
 235 }
 236
 237 void X509_get0_signature(const ASN1_BIT_STRING **psig,
 238                          const X509_ALGOR **palg, const X509 *x)
 239 {
 240     if (psig)
 241         *psig = &x->signature;
 242     if (palg)
 243         *palg = &x->sig_alg;
 244 }
 245
 246 int X509_get_signature_nid(const X509 *x)
 247 {
 248     return OBJ_obj2nid(x->sig_alg.algorithm);
 249 }
 250
 251 void X509_set0_distinguishing_id(X509 *x, ASN1_OCTET_STRING *d_id)
 252 {
 253     ASN1_OCTET_STRING_free(x->distinguishing_id);
 254     x->distinguishing_id = d_id;
 255 }
 256
 257 ASN1_OCTET_STRING *X509_get0_distinguishing_id(X509 *x)
 258 {
 259     return x->distinguishing_id;
 260 }