crypto/x509/x509_cmp.c

   1 /* crypto/x509/x509_cmp.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <ctype.h>
  61 #include "cryptlib.h"
  62 #include <openssl/asn1.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/x509.h>
  65 #include <openssl/x509v3.h>
  66
  67 int X509_issuer_and_serial_cmp(const X509 *a, const X509 *b)
  68         {
  69         int i;
  70         X509_CINF *ai,*bi;
  71
  72         ai=a->cert_info;
  73         bi=b->cert_info;
  74         i=M_ASN1_INTEGER_cmp(ai->serialNumber,bi->serialNumber);
  75         if (i) return(i);
  76         return(X509_NAME_cmp(ai->issuer,bi->issuer));
  77         }
  78
  79 #ifndef OPENSSL_NO_MD5
  80 unsigned long X509_issuer_and_serial_hash(X509 *a)
  81         {
  82         unsigned long ret=0;
  83         EVP_MD_CTX ctx;
  84         unsigned char md[16];
  85         char str[256];
  86
  87         EVP_MD_CTX_init(&ctx);
  88         X509_NAME_oneline(a->cert_info->issuer,str,256);
  89         ret=strlen(str);
  90         EVP_DigestInit_ex(&ctx, EVP_md5(), NULL);
  91         EVP_DigestUpdate(&ctx,(unsigned char *)str,ret);
  92         EVP_DigestUpdate(&ctx,(unsigned char *)a->cert_info->serialNumber->data,
  93                 (unsigned long)a->cert_info->serialNumber->length);
  94         EVP_DigestFinal_ex(&ctx,&(md[0]),NULL);
  95         ret=(   ((unsigned long)md[0]     )|((unsigned long)md[1]<<8L)|
  96                 ((unsigned long)md[2]<<16L)|((unsigned long)md[3]<<24L)
  97                 )&0xffffffffL;
  98         EVP_MD_CTX_cleanup(&ctx);
  99         return(ret);
 100         }
 101 #endif
 102
 103 int X509_issuer_name_cmp(const X509 *a, const X509 *b)
 104         {
 105         return(X509_NAME_cmp(a->cert_info->issuer,b->cert_info->issuer));
 106         }
 107
 108 int X509_subject_name_cmp(const X509 *a, const X509 *b)
 109         {
 110         return(X509_NAME_cmp(a->cert_info->subject,b->cert_info->subject));
 111         }
 112
 113 int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b)
 114         {
 115         return(X509_NAME_cmp(a->crl->issuer,b->crl->issuer));
 116         }
 117
 118 X509_NAME *X509_get_issuer_name(X509 *a)
 119         {
 120         return(a->cert_info->issuer);
 121         }
 122
 123 unsigned long X509_issuer_name_hash(X509 *x)
 124         {
 125         return(X509_NAME_hash(x->cert_info->issuer));
 126         }
 127
 128 X509_NAME *X509_get_subject_name(X509 *a)
 129         {
 130         return(a->cert_info->subject);
 131         }
 132
 133 ASN1_INTEGER *X509_get_serialNumber(X509 *a)
 134         {
 135         return(a->cert_info->serialNumber);
 136         }
 137
 138 unsigned long X509_subject_name_hash(X509 *x)
 139         {
 140         return(X509_NAME_hash(x->cert_info->subject));
 141         }
 142
 143 #ifndef OPENSSL_NO_SHA
 144 /* Compare two certificates: they must be identical for
 145  * this to work. NB: Although "cmp" operations are generally
 146  * prototyped to take "const" arguments (eg. for use in
 147  * STACKs), the way X509 handling is - these operations may
 148  * involve ensuring the hashes are up-to-date and ensuring
 149  * certain cert information is cached. So this is the point
 150  * where the "depth-first" constification tree has to halt
 151  * with an evil cast.
 152  */
 153 int X509_cmp(const X509 *a, const X509 *b)
 154 {
 155         /* ensure hash is valid */
 156         X509_check_purpose((X509 *)a, -1, 0);
 157         X509_check_purpose((X509 *)b, -1, 0);
 158
 159         return memcmp(a->sha1_hash, b->sha1_hash, SHA_DIGEST_LENGTH);
 160 }
 161 #endif
 162
 163
 164 /* Case insensitive string comparision */
 165 static int nocase_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 166 {
 167         int i;
 168
 169         if (a->length != b->length)
 170                 return (a->length - b->length);
 171
 172         for (i=0; i<a->length; i++)
 173         {
 174                 int ca, cb;
 175
 176                 ca = tolower(a->data[i]);
 177                 cb = tolower(b->data[i]);
 178
 179                 if (ca != cb)
 180                         return(ca-cb);
 181         }
 182         return 0;
 183 }
 184
 185 /* Case insensitive string comparision with space normalization
 186  * Space normalization - ignore leading, trailing spaces,
 187  *       multiple spaces between characters are replaced by single space
 188  */
 189 static int nocase_spacenorm_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 190 {
 191         unsigned char *pa = NULL, *pb = NULL;
 192         int la, lb;
 193
 194         la = a->length;
 195         lb = b->length;
 196         pa = a->data;
 197         pb = b->data;
 198
 199         /* skip leading spaces */
 200         while (la > 0 && isspace(*pa))
 201         {
 202                 la--;
 203                 pa++;
 204         }
 205         while (lb > 0 && isspace(*pb))
 206         {
 207                 lb--;
 208                 pb++;
 209         }
 210
 211         /* skip trailing spaces */
 212         while (la > 0 && isspace(pa[la-1]))
 213                 la--;
 214         while (lb > 0 && isspace(pb[lb-1]))
 215                 lb--;
 216
 217         /* compare strings with space normalization */
 218         while (la > 0 && lb > 0)
 219         {
 220                 int ca, cb;
 221
 222                 /* compare character */
 223                 ca = tolower(*pa);
 224                 cb = tolower(*pb);
 225                 if (ca != cb)
 226                         return (ca - cb);
 227
 228                 pa++; pb++;
 229                 la--; lb--;
 230
 231                 if (la <= 0 || lb <= 0)
 232                         break;
 233
 234                 /* is white space next character ? */
 235                 if (isspace(*pa) && isspace(*pb))
 236                 {
 237                         /* skip remaining white spaces */
 238                         while (la > 0 && isspace(*pa))
 239                         {
 240                                 la--;
 241                                 pa++;
 242                         }
 243                         while (lb > 0 && isspace(*pb))
 244                         {
 245                                 lb--;
 246                                 pb++;
 247                         }
 248                 }
 249         }
 250         if (la > 0 || lb > 0)
 251                 return la - lb;
 252
 253         return 0;
 254 }
 255
 256 int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b)
 257         {
 258         int i,j;
 259         X509_NAME_ENTRY *na,*nb;
 260
 261         if (sk_X509_NAME_ENTRY_num(a->entries)
 262             != sk_X509_NAME_ENTRY_num(b->entries))
 263                 return sk_X509_NAME_ENTRY_num(a->entries)
 264                   -sk_X509_NAME_ENTRY_num(b->entries);
 265         for (i=sk_X509_NAME_ENTRY_num(a->entries)-1; i>=0; i--)
 266                 {
 267                 na=sk_X509_NAME_ENTRY_value(a->entries,i);
 268                 nb=sk_X509_NAME_ENTRY_value(b->entries,i);
 269                 j=na->value->type-nb->value->type;
 270                 if (j) return(j);
 271                 if (na->value->type == V_ASN1_PRINTABLESTRING)
 272                         j=nocase_spacenorm_cmp(na->value, nb->value);
 273                 else if (na->value->type == V_ASN1_IA5STRING
 274                         && OBJ_obj2nid(na->object) == NID_pkcs9_emailAddress)
 275                         j=nocase_cmp(na->value, nb->value);
 276                 else
 277                         {
 278                         j=na->value->length-nb->value->length;
 279                         if (j) return(j);
 280                         j=memcmp(na->value->data,nb->value->data,
 281                                 na->value->length);
 282                         }
 283                 if (j) return(j);
 284                 j=na->set-nb->set;
 285                 if (j) return(j);
 286                 }
 287
 288         /* We will check the object types after checking the values
 289          * since the values will more often be different than the object
 290          * types. */
 291         for (i=sk_X509_NAME_ENTRY_num(a->entries)-1; i>=0; i--)
 292                 {
 293                 na=sk_X509_NAME_ENTRY_value(a->entries,i);
 294                 nb=sk_X509_NAME_ENTRY_value(b->entries,i);
 295                 j=OBJ_cmp(na->object,nb->object);
 296                 if (j) return(j);
 297                 }
 298         return(0);
 299         }
 300
 301 #ifndef OPENSSL_NO_MD5
 302 /* I now DER encode the name and hash it.  Since I cache the DER encoding,
 303  * this is reasonably efficient. */
 304 unsigned long X509_NAME_hash(X509_NAME *x)
 305         {
 306         unsigned long ret=0;
 307         unsigned char md[16];
 308
 309         /* Make sure X509_NAME structure contains valid cached encoding */
 310         i2d_X509_NAME(x,NULL);
 311         EVP_Digest(x->bytes->data, x->bytes->length, md, NULL, EVP_md5(), NULL);
 312
 313         ret=(   ((unsigned long)md[0]     )|((unsigned long)md[1]<<8L)|
 314                 ((unsigned long)md[2]<<16L)|((unsigned long)md[3]<<24L)
 315                 )&0xffffffffL;
 316         return(ret);
 317         }
 318 #endif
 319
 320 /* Search a stack of X509 for a match */
 321 X509 *X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name,
 322                 ASN1_INTEGER *serial)
 323         {
 324         int i;
 325         X509_CINF cinf;
 326         X509 x,*x509=NULL;
 327
 328         if(!sk) return NULL;
 329
 330         x.cert_info= &cinf;
 331         cinf.serialNumber=serial;
 332         cinf.issuer=name;
 333
 334         for (i=0; i<sk_X509_num(sk); i++)
 335                 {
 336                 x509=sk_X509_value(sk,i);
 337                 if (X509_issuer_and_serial_cmp(x509,&x) == 0)
 338                         return(x509);
 339                 }
 340         return(NULL);
 341         }
 342
 343 X509 *X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name)
 344         {
 345         X509 *x509;
 346         int i;
 347
 348         for (i=0; i<sk_X509_num(sk); i++)
 349                 {
 350                 x509=sk_X509_value(sk,i);
 351                 if (X509_NAME_cmp(X509_get_subject_name(x509),name) == 0)
 352                         return(x509);
 353                 }
 354         return(NULL);
 355         }
 356
 357 EVP_PKEY *X509_get_pubkey(X509 *x)
 358         {
 359         if ((x == NULL) || (x->cert_info == NULL))
 360                 return(NULL);
 361         return(X509_PUBKEY_get(x->cert_info->key));
 362         }
 363
 364 ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)
 365         {
 366         if(!x) return NULL;
 367         return x->cert_info->key->public_key;
 368         }
 369
 370 int X509_check_private_key(X509 *x, EVP_PKEY *k)
 371         {
 372         EVP_PKEY *xk=NULL;
 373         int ok=0;
 374
 375         xk=X509_get_pubkey(x);
 376         if (xk->type != k->type)
 377             {
 378             X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_KEY_TYPE_MISMATCH);
 379             goto err;
 380             }
 381         switch (k->type)
 382                 {
 383 #ifndef OPENSSL_NO_RSA
 384         case EVP_PKEY_RSA:
 385                 if (BN_cmp(xk->pkey.rsa->n,k->pkey.rsa->n) != 0
 386                     || BN_cmp(xk->pkey.rsa->e,k->pkey.rsa->e) != 0)
 387                     {
 388                     X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_KEY_VALUES_MISMATCH);
 389                     goto err;
 390                     }
 391                 break;
 392 #endif
 393 #ifndef OPENSSL_NO_DSA
 394         case EVP_PKEY_DSA:
 395                 if (BN_cmp(xk->pkey.dsa->pub_key,k->pkey.dsa->pub_key) != 0)
 396                     {
 397                     X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_KEY_VALUES_MISMATCH);
 398                     goto err;
 399                     }
 400                 break;
 401 #endif
 402 #ifndef OPENSSL_NO_EC
 403         case EVP_PKEY_EC:
 404                 {
 405                 int  r = EC_POINT_cmp(xk->pkey.eckey->group,
 406                         xk->pkey.eckey->pub_key,k->pkey.eckey->pub_key,NULL);
 407                 if (r != 0)
 408                         {
 409                         if (r == 1)
 410                                 X509err(X509_F_X509_CHECK_PRIVATE_KEY, X509_R_KEY_VALUES_MISMATCH);
 411                         else
 412                                 X509err(X509_F_X509_CHECK_PRIVATE_KEY, ERR_R_EC_LIB);
 413
 414                         goto err;
 415                         }
 416                 }
 417                 break;
 418 #endif
 419 #ifndef OPENSSL_NO_DH
 420         case EVP_PKEY_DH:
 421                 /* No idea */
 422                 X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_CANT_CHECK_DH_KEY);
 423                 goto err;
 424 #endif
 425         default:
 426                 X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_UNKNOWN_KEY_TYPE);
 427                 goto err;
 428                 }
 429
 430         ok=1;
 431 err:
 432         EVP_PKEY_free(xk);
 433         return(ok);
 434         }