crypto/x509/x_x509.c

   1 /*
   2  * Copyright 1995-2020 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_ALLOC_FUNCTIONS_fname(X509, X509, X509)
 113 IMPLEMENT_ASN1_DUP_FUNCTION(X509)
 114
 115 X509 *d2i_X509(X509 **a, const unsigned char **in, long len)
 116 {
 117     X509 *cert = NULL;
 118
 119     cert = (X509 *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, (X509_it()));
 120     /* Only cache the extensions if the cert object was passed in */
 121     if (cert != NULL && a != NULL) {
 122         if (!x509v3_cache_extensions(cert))
 123             cert = NULL;
 124     }
 125     return cert;
 126 }
 127 int i2d_X509(const X509 *a, unsigned char **out)
 128 {
 129     return ASN1_item_i2d((const ASN1_VALUE *)a, out, (X509_it()));
 130 }
 131
 132 /*
 133  * This should only be used if the X509 object was embedded inside another
 134  * asn1 object and it needs a libctx to operate.
 135  * Use X509_new_ex() instead if possible.
 136  */
 137 int x509_set0_libctx(X509 *x, OSSL_LIB_CTX *libctx, const char *propq)
 138 {
 139     if (x != NULL) {
 140         x->libctx = libctx;
 141         x->propq = propq;
 142     }
 143     return 1;
 144 }
 145
 146 X509 *X509_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
 147 {
 148     X509 *cert = NULL;
 149
 150     cert = (X509 *)ASN1_item_new((X509_it()));
 151     (void)x509_set0_libctx(cert, libctx, propq);
 152     return cert;
 153 }
 154
 155 int X509_set_ex_data(X509 *r, int idx, void *arg)
 156 {
 157     return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
 158 }
 159
 160 void *X509_get_ex_data(const X509 *r, int idx)
 161 {
 162     return CRYPTO_get_ex_data(&r->ex_data, idx);
 163 }
 164
 165 /*
 166  * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with
 167  * extra info tagged on the end. Since these functions set how a certificate
 168  * is trusted they should only be used when the certificate comes from a
 169  * reliable source such as local storage.
 170  */
 171
 172 X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length)
 173 {
 174     const unsigned char *q;
 175     X509 *ret;
 176     int freeret = 0;
 177
 178     /* Save start position */
 179     q = *pp;
 180
 181     if (a == NULL || *a == NULL)
 182         freeret = 1;
 183     ret = d2i_X509(a, &q, length);
 184     /* If certificate unreadable then forget it */
 185     if (ret == NULL)
 186         return NULL;
 187     /* update length */
 188     length -= q - *pp;
 189     if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length))
 190         goto err;
 191     *pp = q;
 192     return ret;
 193  err:
 194     if (freeret) {
 195         X509_free(ret);
 196         if (a)
 197             *a = NULL;
 198     }
 199     return NULL;
 200 }
 201
 202 /*
 203  * Serialize trusted certificate to *pp or just return the required buffer
 204  * length if pp == NULL.  We ultimately want to avoid modifying *pp in the
 205  * error path, but that depends on similar hygiene in lower-level functions.
 206  * Here we avoid compounding the problem.
 207  */
 208 static int i2d_x509_aux_internal(const X509 *a, unsigned char **pp)
 209 {
 210     int length, tmplen;
 211     unsigned char *start = pp != NULL ? *pp : NULL;
 212
 213     /*
 214      * This might perturb *pp on error, but fixing that belongs in i2d_X509()
 215      * not here.  It should be that if a == NULL length is zero, but we check
 216      * both just in case.
 217      */
 218     length = i2d_X509(a, pp);
 219     if (length <= 0 || a == NULL)
 220         return length;
 221
 222     tmplen = i2d_X509_CERT_AUX(a->aux, pp);
 223     if (tmplen < 0) {
 224         if (start != NULL)
 225             *pp = start;
 226         return tmplen;
 227     }
 228     length += tmplen;
 229
 230     return length;
 231 }
 232
 233 /*
 234  * Serialize trusted certificate to *pp, or just return the required buffer
 235  * length if pp == NULL.
 236  *
 237  * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since
 238  * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do
 239  * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the
 240  * allocated buffer.
 241  */
 242 int i2d_X509_AUX(const X509 *a, unsigned char **pp)
 243 {
 244     int length;
 245     unsigned char *tmp;
 246
 247     /* Buffer provided by caller */
 248     if (pp == NULL || *pp != NULL)
 249         return i2d_x509_aux_internal(a, pp);
 250
 251     /* Obtain the combined length */
 252     if ((length = i2d_x509_aux_internal(a, NULL)) <= 0)
 253         return length;
 254
 255     /* Allocate requisite combined storage */
 256     *pp = tmp = OPENSSL_malloc(length);
 257     if (tmp == NULL) {
 258         X509err(X509_F_I2D_X509_AUX, ERR_R_MALLOC_FAILURE);
 259         return -1;
 260     }
 261
 262     /* Encode, but keep *pp at the originally malloced pointer */
 263     length = i2d_x509_aux_internal(a, &tmp);
 264     if (length <= 0) {
 265         OPENSSL_free(*pp);
 266         *pp = NULL;
 267     }
 268     return length;
 269 }
 270
 271 int i2d_re_X509_tbs(X509 *x, unsigned char **pp)
 272 {
 273     x->cert_info.enc.modified = 1;
 274     return i2d_X509_CINF(&x->cert_info, pp);
 275 }
 276
 277 void X509_get0_signature(const ASN1_BIT_STRING **psig,
 278                          const X509_ALGOR **palg, const X509 *x)
 279 {
 280     if (psig)
 281         *psig = &x->signature;
 282     if (palg)
 283         *palg = &x->sig_alg;
 284 }
 285
 286 int X509_get_signature_nid(const X509 *x)
 287 {
 288     return OBJ_obj2nid(x->sig_alg.algorithm);
 289 }
 290
 291 void X509_set0_distinguishing_id(X509 *x, ASN1_OCTET_STRING *d_id)
 292 {
 293     ASN1_OCTET_STRING_free(x->distinguishing_id);
 294     x->distinguishing_id = d_id;
 295 }
 296
 297 ASN1_OCTET_STRING *X509_get0_distinguishing_id(X509 *x)
 298 {
 299     return x->distinguishing_id;
 300 }