crypto/x509v3/v3_lib.c

   1 /*
   2  * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 /* X509 v3 extension utilities */
  11
  12 #include <stdio.h>
  13 #include "internal/cryptlib.h"
  14 #include <openssl/conf.h>
  15 #include <openssl/x509v3.h>
  16
  17 #include "ext_dat.h"
  18
  19 static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
  20
  21 static int ext_cmp(const X509V3_EXT_METHOD *const *a,
  22                    const X509V3_EXT_METHOD *const *b);
  23 static void ext_list_free(X509V3_EXT_METHOD *ext);
  24
  25 int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
  26 {
  27     if (ext_list == NULL
  28         && (ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp)) == NULL) {
  29         X509V3err(X509V3_F_X509V3_EXT_ADD, ERR_R_MALLOC_FAILURE);
  30         return 0;
  31     }
  32     if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
  33         X509V3err(X509V3_F_X509V3_EXT_ADD, ERR_R_MALLOC_FAILURE);
  34         return 0;
  35     }
  36     return 1;
  37 }
  38
  39 static int ext_cmp(const X509V3_EXT_METHOD *const *a,
  40                    const X509V3_EXT_METHOD *const *b)
  41 {
  42     return ((*a)->ext_nid - (*b)->ext_nid);
  43 }
  44
  45 DECLARE_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
  46                            const X509V3_EXT_METHOD *, ext);
  47 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
  48                              const X509V3_EXT_METHOD *, ext);
  49
  50 /*
  51  * This table will be searched using OBJ_bsearch so it *must* kept in order
  52  * of the ext_nid values.
  53  */
  54
  55 static const X509V3_EXT_METHOD *standard_exts[] = {
  56     &v3_nscert,
  57     &v3_ns_ia5_list[0],
  58     &v3_ns_ia5_list[1],
  59     &v3_ns_ia5_list[2],
  60     &v3_ns_ia5_list[3],
  61     &v3_ns_ia5_list[4],
  62     &v3_ns_ia5_list[5],
  63     &v3_ns_ia5_list[6],
  64     &v3_skey_id,
  65     &v3_key_usage,
  66     &v3_pkey_usage_period,
  67     &v3_alt[0],
  68     &v3_alt[1],
  69     &v3_bcons,
  70     &v3_crl_num,
  71     &v3_cpols,
  72     &v3_akey_id,
  73     &v3_crld,
  74     &v3_ext_ku,
  75     &v3_delta_crl,
  76     &v3_crl_reason,
  77 #ifndef OPENSSL_NO_OCSP
  78     &v3_crl_invdate,
  79 #endif
  80     &v3_sxnet,
  81     &v3_info,
  82 #ifndef OPENSSL_NO_RFC3779
  83     &v3_addr,
  84     &v3_asid,
  85 #endif
  86 #ifndef OPENSSL_NO_OCSP
  87     &v3_ocsp_nonce,
  88     &v3_ocsp_crlid,
  89     &v3_ocsp_accresp,
  90     &v3_ocsp_nocheck,
  91     &v3_ocsp_acutoff,
  92     &v3_ocsp_serviceloc,
  93 #endif
  94     &v3_sinfo,
  95     &v3_policy_constraints,
  96 #ifndef OPENSSL_NO_OCSP
  97     &v3_crl_hold,
  98 #endif
  99     &v3_pci,
 100     &v3_name_constraints,
 101     &v3_policy_mappings,
 102     &v3_inhibit_anyp,
 103     &v3_idp,
 104     &v3_alt[2],
 105     &v3_freshest_crl,
 106 #ifndef OPENSSL_NO_CT
 107     &v3_ct_scts[0],
 108     &v3_ct_scts[1],
 109     &v3_ct_scts[2],
 110 #endif
 111     &v3_tls_feature,
 112 };
 113
 114 /* Number of standard extensions */
 115
 116 #define STANDARD_EXTENSION_COUNT OSSL_NELEM(standard_exts)
 117
 118 const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
 119 {
 120     X509V3_EXT_METHOD tmp;
 121     const X509V3_EXT_METHOD *t = &tmp, *const *ret;
 122     int idx;
 123     if (nid < 0)
 124         return NULL;
 125     tmp.ext_nid = nid;
 126     ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT);
 127     if (ret)
 128         return *ret;
 129     if (!ext_list)
 130         return NULL;
 131     idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp);
 132     if (idx == -1)
 133         return NULL;
 134     return sk_X509V3_EXT_METHOD_value(ext_list, idx);
 135 }
 136
 137 const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
 138 {
 139     int nid;
 140     if ((nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext))) == NID_undef)
 141         return NULL;
 142     return X509V3_EXT_get_nid(nid);
 143 }
 144
 145 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
 146 {
 147     for (; extlist->ext_nid != -1; extlist++)
 148         if (!X509V3_EXT_add(extlist))
 149             return 0;
 150     return 1;
 151 }
 152
 153 int X509V3_EXT_add_alias(int nid_to, int nid_from)
 154 {
 155     const X509V3_EXT_METHOD *ext;
 156     X509V3_EXT_METHOD *tmpext;
 157
 158     if ((ext = X509V3_EXT_get_nid(nid_from)) == NULL) {
 159         X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS, X509V3_R_EXTENSION_NOT_FOUND);
 160         return 0;
 161     }
 162     if ((tmpext = OPENSSL_malloc(sizeof(*tmpext))) == NULL) {
 163         X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS, ERR_R_MALLOC_FAILURE);
 164         return 0;
 165     }
 166     *tmpext = *ext;
 167     tmpext->ext_nid = nid_to;
 168     tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
 169     return X509V3_EXT_add(tmpext);
 170 }
 171
 172 void X509V3_EXT_cleanup(void)
 173 {
 174     sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
 175     ext_list = NULL;
 176 }
 177
 178 static void ext_list_free(X509V3_EXT_METHOD *ext)
 179 {
 180     if (ext->ext_flags & X509V3_EXT_DYNAMIC)
 181         OPENSSL_free(ext);
 182 }
 183
 184 /*
 185  * Legacy function: we don't need to add standard extensions any more because
 186  * they are now kept in ext_dat.h.
 187  */
 188
 189 int X509V3_add_standard_extensions(void)
 190 {
 191     return 1;
 192 }
 193
 194 /* Return an extension internal structure */
 195
 196 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
 197 {
 198     const X509V3_EXT_METHOD *method;
 199     const unsigned char *p;
 200     ASN1_STRING *extvalue;
 201     int extlen;
 202
 203     if ((method = X509V3_EXT_get(ext)) == NULL)
 204         return NULL;
 205     extvalue = X509_EXTENSION_get_data(ext);
 206     p = ASN1_STRING_data(extvalue);
 207     extlen = ASN1_STRING_length(extvalue);
 208     if (method->it)
 209         return ASN1_item_d2i(NULL, &p, extlen, ASN1_ITEM_ptr(method->it));
 210     return method->d2i(NULL, &p, extlen);
 211 }
 212
 213 /*-
 214  * Get critical flag and decoded version of extension from a NID.
 215  * The "idx" variable returns the last found extension and can
 216  * be used to retrieve multiple extensions of the same NID.
 217  * However multiple extensions with the same NID is usually
 218  * due to a badly encoded certificate so if idx is NULL we
 219  * choke if multiple extensions exist.
 220  * The "crit" variable is set to the critical value.
 221  * The return value is the decoded extension or NULL on
 222  * error. The actual error can have several different causes,
 223  * the value of *crit reflects the cause:
 224  * >= 0, extension found but not decoded (reflects critical value).
 225  * -1 extension not found.
 226  * -2 extension occurs more than once.
 227  */
 228
 229 void *X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
 230                      int *idx)
 231 {
 232     int lastpos, i;
 233     X509_EXTENSION *ex, *found_ex = NULL;
 234     if (!x) {
 235         if (idx)
 236             *idx = -1;
 237         if (crit)
 238             *crit = -1;
 239         return NULL;
 240     }
 241     if (idx)
 242         lastpos = *idx + 1;
 243     else
 244         lastpos = 0;
 245     if (lastpos < 0)
 246         lastpos = 0;
 247     for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) {
 248         ex = sk_X509_EXTENSION_value(x, i);
 249         if (OBJ_obj2nid(X509_EXTENSION_get_object(ex)) == nid) {
 250             if (idx) {
 251                 *idx = i;
 252                 found_ex = ex;
 253                 break;
 254             } else if (found_ex) {
 255                 /* Found more than one */
 256                 if (crit)
 257                     *crit = -2;
 258                 return NULL;
 259             }
 260             found_ex = ex;
 261         }
 262     }
 263     if (found_ex) {
 264         /* Found it */
 265         if (crit)
 266             *crit = X509_EXTENSION_get_critical(found_ex);
 267         return X509V3_EXT_d2i(found_ex);
 268     }
 269
 270     /* Extension not found */
 271     if (idx)
 272         *idx = -1;
 273     if (crit)
 274         *crit = -1;
 275     return NULL;
 276 }
 277
 278 /*
 279  * This function is a general extension append, replace and delete utility.
 280  * The precise operation is governed by the 'flags' value. The 'crit' and
 281  * 'value' arguments (if relevant) are the extensions internal structure.
 282  */
 283
 284 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
 285                     int crit, unsigned long flags)
 286 {
 287     int extidx = -1;
 288     int errcode;
 289     X509_EXTENSION *ext, *extmp;
 290     unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
 291
 292     /*
 293      * If appending we don't care if it exists, otherwise look for existing
 294      * extension.
 295      */
 296     if (ext_op != X509V3_ADD_APPEND)
 297         extidx = X509v3_get_ext_by_NID(*x, nid, -1);
 298
 299     /* See if extension exists */
 300     if (extidx >= 0) {
 301         /* If keep existing, nothing to do */
 302         if (ext_op == X509V3_ADD_KEEP_EXISTING)
 303             return 1;
 304         /* If default then its an error */
 305         if (ext_op == X509V3_ADD_DEFAULT) {
 306             errcode = X509V3_R_EXTENSION_EXISTS;
 307             goto err;
 308         }
 309         /* If delete, just delete it */
 310         if (ext_op == X509V3_ADD_DELETE) {
 311             if (!sk_X509_EXTENSION_delete(*x, extidx))
 312                 return -1;
 313             return 1;
 314         }
 315     } else {
 316         /*
 317          * If replace existing or delete, error since extension must exist
 318          */
 319         if ((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
 320             (ext_op == X509V3_ADD_DELETE)) {
 321             errcode = X509V3_R_EXTENSION_NOT_FOUND;
 322             goto err;
 323         }
 324     }
 325
 326     /*
 327      * If we get this far then we have to create an extension: could have
 328      * some flags for alternative encoding schemes...
 329      */
 330
 331     ext = X509V3_EXT_i2d(nid, crit, value);
 332
 333     if (!ext) {
 334         X509V3err(X509V3_F_X509V3_ADD1_I2D,
 335                   X509V3_R_ERROR_CREATING_EXTENSION);
 336         return 0;
 337     }
 338
 339     /* If extension exists replace it.. */
 340     if (extidx >= 0) {
 341         extmp = sk_X509_EXTENSION_value(*x, extidx);
 342         X509_EXTENSION_free(extmp);
 343         if (!sk_X509_EXTENSION_set(*x, extidx, ext))
 344             return -1;
 345         return 1;
 346     }
 347
 348     if (*x == NULL
 349         && (*x = sk_X509_EXTENSION_new_null()) == NULL)
 350         return -1;
 351     if (!sk_X509_EXTENSION_push(*x, ext))
 352         return -1;
 353
 354     return 1;
 355
 356  err:
 357     if (!(flags & X509V3_ADD_SILENT))
 358         X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode);
 359     return 0;
 360 }