crypto/x509/x_x509.c

   1 /*
   2  * Copyright 1995-2021 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 ossl_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         ossl_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         ossl_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         OPENSSL_free(ret->propq);
  99         break;
 100
 101     case ASN1_OP_DUP_POST:
 102         {
 103             X509 *old = exarg;
 104
 105             if (!ossl_x509_set0_libctx(ret, old->libctx, old->propq))
 106                 return 0;
 107         }
 108         break;
 109     case ASN1_OP_GET0_LIBCTX:
 110         {
 111             OSSL_LIB_CTX **libctx = exarg;
 112
 113             *libctx = ret->libctx;
 114         }
 115         break;
 116
 117     case ASN1_OP_GET0_PROPQ:
 118         {
 119             const char **propq = exarg;
 120
 121             *propq = ret->propq;
 122         }
 123         break;
 124
 125     default:
 126         break;
 127     }
 128
 129     return 1;
 130 }
 131
 132 ASN1_SEQUENCE_ref(X509, x509_cb) = {
 133         ASN1_EMBED(X509, cert_info, X509_CINF),
 134         ASN1_EMBED(X509, sig_alg, X509_ALGOR),
 135         ASN1_EMBED(X509, signature, ASN1_BIT_STRING)
 136 } ASN1_SEQUENCE_END_ref(X509, X509)
 137
 138 IMPLEMENT_ASN1_FUNCTIONS(X509)
 139 IMPLEMENT_ASN1_DUP_FUNCTION(X509)
 140
 141 /*
 142  * This should only be used if the X509 object was embedded inside another
 143  * asn1 object and it needs a libctx to operate.
 144  * Use X509_new_ex() instead if possible.
 145  */
 146 int ossl_x509_set0_libctx(X509 *x, OSSL_LIB_CTX *libctx, const char *propq)
 147 {
 148     if (x != NULL) {
 149         x->libctx = libctx;
 150         OPENSSL_free(x->propq);
 151         x->propq = NULL;
 152         if (propq != NULL) {
 153             x->propq = OPENSSL_strdup(propq);
 154             if (x->propq == NULL)
 155                 return 0;
 156         }
 157     }
 158     return 1;
 159 }
 160
 161 X509 *X509_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
 162 {
 163     X509 *cert = NULL;
 164
 165     cert = (X509 *)ASN1_item_new_ex(X509_it(), libctx, propq);
 166     if (!ossl_x509_set0_libctx(cert, libctx, propq)) {
 167         X509_free(cert);
 168         cert = NULL;
 169     }
 170     return cert;
 171 }
 172
 173 int X509_set_ex_data(X509 *r, int idx, void *arg)
 174 {
 175     return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
 176 }
 177
 178 void *X509_get_ex_data(const X509 *r, int idx)
 179 {
 180     return CRYPTO_get_ex_data(&r->ex_data, idx);
 181 }
 182
 183 /*
 184  * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with
 185  * extra info tagged on the end. Since these functions set how a certificate
 186  * is trusted they should only be used when the certificate comes from a
 187  * reliable source such as local storage.
 188  */
 189
 190 X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length)
 191 {
 192     const unsigned char *q;
 193     X509 *ret;
 194     int freeret = 0;
 195
 196     /* Save start position */
 197     q = *pp;
 198
 199     if (a == NULL || *a == NULL)
 200         freeret = 1;
 201     ret = d2i_X509(a, &q, length);
 202     /* If certificate unreadable then forget it */
 203     if (ret == NULL)
 204         return NULL;
 205     /* update length */
 206     length -= q - *pp;
 207     if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length))
 208         goto err;
 209     *pp = q;
 210     return ret;
 211  err:
 212     if (freeret) {
 213         X509_free(ret);
 214         if (a)
 215             *a = NULL;
 216     }
 217     return NULL;
 218 }
 219
 220 /*
 221  * Serialize trusted certificate to *pp or just return the required buffer
 222  * length if pp == NULL.  We ultimately want to avoid modifying *pp in the
 223  * error path, but that depends on similar hygiene in lower-level functions.
 224  * Here we avoid compounding the problem.
 225  */
 226 static int i2d_x509_aux_internal(const X509 *a, unsigned char **pp)
 227 {
 228     int length, tmplen;
 229     unsigned char *start = pp != NULL ? *pp : NULL;
 230
 231     /*
 232      * This might perturb *pp on error, but fixing that belongs in i2d_X509()
 233      * not here.  It should be that if a == NULL length is zero, but we check
 234      * both just in case.
 235      */
 236     length = i2d_X509(a, pp);
 237     if (length <= 0 || a == NULL)
 238         return length;
 239
 240     tmplen = i2d_X509_CERT_AUX(a->aux, pp);
 241     if (tmplen < 0) {
 242         if (start != NULL)
 243             *pp = start;
 244         return tmplen;
 245     }
 246     length += tmplen;
 247
 248     return length;
 249 }
 250
 251 /*
 252  * Serialize trusted certificate to *pp, or just return the required buffer
 253  * length if pp == NULL.
 254  *
 255  * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since
 256  * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do
 257  * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the
 258  * allocated buffer.
 259  */
 260 int i2d_X509_AUX(const X509 *a, unsigned char **pp)
 261 {
 262     int length;
 263     unsigned char *tmp;
 264
 265     /* Buffer provided by caller */
 266     if (pp == NULL || *pp != NULL)
 267         return i2d_x509_aux_internal(a, pp);
 268
 269     /* Obtain the combined length */
 270     if ((length = i2d_x509_aux_internal(a, NULL)) <= 0)
 271         return length;
 272
 273     /* Allocate requisite combined storage */
 274     *pp = tmp = OPENSSL_malloc(length);
 275     if (tmp == NULL) {
 276         ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
 277         return -1;
 278     }
 279
 280     /* Encode, but keep *pp at the originally malloced pointer */
 281     length = i2d_x509_aux_internal(a, &tmp);
 282     if (length <= 0) {
 283         OPENSSL_free(*pp);
 284         *pp = NULL;
 285     }
 286     return length;
 287 }
 288
 289 int i2d_re_X509_tbs(X509 *x, unsigned char **pp)
 290 {
 291     x->cert_info.enc.modified = 1;
 292     return i2d_X509_CINF(&x->cert_info, pp);
 293 }
 294
 295 void X509_get0_signature(const ASN1_BIT_STRING **psig,
 296                          const X509_ALGOR **palg, const X509 *x)
 297 {
 298     if (psig)
 299         *psig = &x->signature;
 300     if (palg)
 301         *palg = &x->sig_alg;
 302 }
 303
 304 int X509_get_signature_nid(const X509 *x)
 305 {
 306     return OBJ_obj2nid(x->sig_alg.algorithm);
 307 }
 308
 309 void X509_set0_distinguishing_id(X509 *x, ASN1_OCTET_STRING *d_id)
 310 {
 311     ASN1_OCTET_STRING_free(x->distinguishing_id);
 312     x->distinguishing_id = d_id;
 313 }
 314
 315 ASN1_OCTET_STRING *X509_get0_distinguishing_id(X509 *x)
 316 {
 317     return x->distinguishing_id;
 318 }