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 "cryptlib.h"
  61 #include <openssl/asn1.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/x509.h>
  64 #include <openssl/x509v3.h>
  65
  66 int X509_issuer_and_serial_cmp(const X509 *a, const X509 *b)
  67         {
  68         int i;
  69         X509_CINF *ai,*bi;
  70
  71         ai=a->cert_info;
  72         bi=b->cert_info;
  73         i=M_ASN1_INTEGER_cmp(ai->serialNumber,bi->serialNumber);
  74         if (i) return(i);
  75         return(X509_NAME_cmp(ai->issuer,bi->issuer));
  76         }
  77
  78 #ifndef OPENSSL_NO_MD5
  79 unsigned long X509_issuer_and_serial_hash(X509 *a)
  80         {
  81         unsigned long ret=0;
  82         EVP_MD_CTX ctx;
  83         unsigned char md[16];
  84         char str[256];
  85
  86         EVP_MD_CTX_init(&ctx);
  87         X509_NAME_oneline(a->cert_info->issuer,str,256);
  88         ret=strlen(str);
  89         EVP_DigestInit_ex(&ctx, EVP_md5(), NULL);
  90         EVP_DigestUpdate(&ctx,(unsigned char *)str,ret);
  91         EVP_DigestUpdate(&ctx,(unsigned char *)a->cert_info->serialNumber->data,
  92                 (unsigned long)a->cert_info->serialNumber->length);
  93         EVP_DigestFinal_ex(&ctx,&(md[0]),NULL);
  94         ret=(   ((unsigned long)md[0]     )|((unsigned long)md[1]<<8L)|
  95                 ((unsigned long)md[2]<<16L)|((unsigned long)md[3]<<24L)
  96                 )&0xffffffffL;
  97         EVP_MD_CTX_cleanup(&ctx);
  98         return(ret);
  99         }
 100 #endif
 101
 102 int X509_issuer_name_cmp(const X509 *a, const X509 *b)
 103         {
 104         return(X509_NAME_cmp(a->cert_info->issuer,b->cert_info->issuer));
 105         }
 106
 107 int X509_subject_name_cmp(const X509 *a, const X509 *b)
 108         {
 109         return(X509_NAME_cmp(a->cert_info->subject,b->cert_info->subject));
 110         }
 111
 112 int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b)
 113         {
 114         return(X509_NAME_cmp(a->crl->issuer,b->crl->issuer));
 115         }
 116
 117 X509_NAME *X509_get_issuer_name(X509 *a)
 118         {
 119         return(a->cert_info->issuer);
 120         }
 121
 122 unsigned long X509_issuer_name_hash(X509 *x)
 123         {
 124         return(X509_NAME_hash(x->cert_info->issuer));
 125         }
 126
 127 X509_NAME *X509_get_subject_name(X509 *a)
 128         {
 129         return(a->cert_info->subject);
 130         }
 131
 132 ASN1_INTEGER *X509_get_serialNumber(X509 *a)
 133         {
 134         return(a->cert_info->serialNumber);
 135         }
 136
 137 unsigned long X509_subject_name_hash(X509 *x)
 138         {
 139         return(X509_NAME_hash(x->cert_info->subject));
 140         }
 141
 142 #ifndef OPENSSL_NO_SHA
 143 /* Compare two certificates: they must be identical for
 144  * this to work. NB: Although "cmp" operations are generally
 145  * prototyped to take "const" arguments (eg. for use in
 146  * STACKs), the way X509 handling is - these operations may
 147  * involve ensuring the hashes are up-to-date and ensuring
 148  * certain cert information is cached. So this is the point
 149  * where the "depth-first" constification tree has to halt
 150  * with an evil cast.
 151  */
 152 int X509_cmp(const X509 *a, const X509 *b)
 153 {
 154         /* ensure hash is valid */
 155         X509_check_purpose((X509 *)a, -1, 0);
 156         X509_check_purpose((X509 *)b, -1, 0);
 157
 158         return memcmp(a->sha1_hash, b->sha1_hash, SHA_DIGEST_LENGTH);
 159 }
 160 #endif
 161
 162
 163 /* Case insensitive string comparision */
 164 static int nocase_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 165 {
 166         int i;
 167
 168         if (a->length != b->length)
 169                 return (a->length - b->length);
 170
 171         for (i=0; i<a->length; i++)
 172         {
 173                 int ca, cb;
 174
 175                 ca = tolower(a->data[i]);
 176                 cb = tolower(b->data[i]);
 177
 178                 if (ca != cb)
 179                         return(ca-cb);
 180         }
 181         return 0;
 182 }
 183
 184 /* Case insensitive string comparision with space normalization
 185  * Space normalization - ignore leading, trailing spaces,
 186  *       multiple spaces between characters are replaced by single space
 187  */
 188 static int nocase_spacenorm_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 189 {
 190         unsigned char *pa = NULL, *pb = NULL;
 191         int la, lb;
 192
 193         la = a->length;
 194         lb = b->length;
 195         pa = a->data;
 196         pb = b->data;
 197
 198         /* skip leading spaces */
 199         while (la > 0 && isspace(*pa))
 200         {
 201                 la--;
 202                 pa++;
 203         }
 204         while (lb > 0 && isspace(*pb))
 205         {
 206                 lb--;
 207                 pb++;
 208         }
 209
 210         /* skip trailing spaces */
 211         while (la > 0 && isspace(pa[la-1]))
 212                 la--;
 213         while (lb > 0 && isspace(pb[lb-1]))
 214                 lb--;
 215
 216         /* compare strings with space normalization */
 217         while (la > 0 && lb > 0)
 218         {
 219                 int ca, cb;
 220
 221                 /* compare character */
 222                 ca = tolower(*pa);
 223                 cb = tolower(*pb);
 224                 if (ca != cb)
 225                         return (ca - cb);
 226
 227                 pa++; pb++;
 228                 la--; lb--;
 229
 230                 if (la <= 0 || lb <= 0)
 231                         break;
 232
 233                 /* is white space next character ? */
 234                 if (isspace(*pa) && isspace(*pb))
 235                 {
 236                         /* skip remaining white spaces */
 237                         while (la > 0 && isspace(*pa))
 238                         {
 239                                 la--;
 240                                 pa++;
 241                         }
 242                         while (lb > 0 && isspace(*pb))
 243                         {
 244                                 lb--;
 245                                 pb++;
 246                         }
 247                 }
 248         }
 249         if (la > 0 || lb > 0)
 250                 return la - lb;
 251
 252         return 0;
 253 }
 254
 255 int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b)
 256         {
 257         int i,j;
 258         X509_NAME_ENTRY *na,*nb;
 259
 260         if (sk_X509_NAME_ENTRY_num(a->entries)
 261             != sk_X509_NAME_ENTRY_num(b->entries))
 262                 return sk_X509_NAME_ENTRY_num(a->entries)
 263                   -sk_X509_NAME_ENTRY_num(b->entries);
 264         for (i=sk_X509_NAME_ENTRY_num(a->entries)-1; i>=0; i--)
 265                 {
 266                 na=sk_X509_NAME_ENTRY_value(a->entries,i);
 267                 nb=sk_X509_NAME_ENTRY_value(b->entries,i);
 268                 j=na->value->type-nb->value->type;
 269                 if (j) return(j);
 270                 if (na->value->type == V_ASN1_PRINTABLESTRING)
 271                         j=nocase_spacenorm_cmp(na->value, nb->value);
 272                 else if (na->value->type == V_ASN1_IA5STRING
 273                         && OBJ_obj2nid(na->object) == NID_pkcs9_emailAddress)
 274                         j=nocase_cmp(na->value, nb->value);
 275                 else
 276                         {
 277                         j=na->value->length-nb->value->length;
 278                         if (j) return(j);
 279                         j=memcmp(na->value->data,nb->value->data,
 280                                 na->value->length);
 281                         }
 282                 if (j) return(j);
 283                 j=na->set-nb->set;
 284                 if (j) return(j);
 285                 }
 286
 287         /* We will check the object types after checking the values
 288          * since the values will more often be different than the object
 289          * types. */
 290         for (i=sk_X509_NAME_ENTRY_num(a->entries)-1; i>=0; i--)
 291                 {
 292                 na=sk_X509_NAME_ENTRY_value(a->entries,i);
 293                 nb=sk_X509_NAME_ENTRY_value(b->entries,i);
 294                 j=OBJ_cmp(na->object,nb->object);
 295                 if (j) return(j);
 296                 }
 297         return(0);
 298         }
 299
 300 #ifndef OPENSSL_NO_MD5
 301 /* I now DER encode the name and hash it.  Since I cache the DER encoding,
 302  * this is reasonably efficient. */
 303 unsigned long X509_NAME_hash(X509_NAME *x)
 304         {
 305         unsigned long ret=0;
 306         unsigned char md[16];
 307
 308         /* Make sure X509_NAME structure contains valid cached encoding */
 309         i2d_X509_NAME(x,NULL);
 310         EVP_Digest(x->bytes->data, x->bytes->length, md, NULL, EVP_md5(), NULL);
 311
 312         ret=(   ((unsigned long)md[0]     )|((unsigned long)md[1]<<8L)|
 313                 ((unsigned long)md[2]<<16L)|((unsigned long)md[3]<<24L)
 314                 )&0xffffffffL;
 315         return(ret);
 316         }
 317 #endif
 318
 319 /* Search a stack of X509 for a match */
 320 X509 *X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name,
 321                 ASN1_INTEGER *serial)
 322         {
 323         int i;
 324         X509_CINF cinf;
 325         X509 x,*x509=NULL;
 326
 327         if(!sk) return NULL;
 328
 329         x.cert_info= &cinf;
 330         cinf.serialNumber=serial;
 331         cinf.issuer=name;
 332
 333         for (i=0; i<sk_X509_num(sk); i++)
 334                 {
 335                 x509=sk_X509_value(sk,i);
 336                 if (X509_issuer_and_serial_cmp(x509,&x) == 0)
 337                         return(x509);
 338                 }
 339         return(NULL);
 340         }
 341
 342 X509 *X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name)
 343         {
 344         X509 *x509;
 345         int i;
 346
 347         for (i=0; i<sk_X509_num(sk); i++)
 348                 {
 349                 x509=sk_X509_value(sk,i);
 350                 if (X509_NAME_cmp(X509_get_subject_name(x509),name) == 0)
 351                         return(x509);
 352                 }
 353         return(NULL);
 354         }
 355
 356 EVP_PKEY *X509_get_pubkey(X509 *x)
 357         {
 358         if ((x == NULL) || (x->cert_info == NULL))
 359                 return(NULL);
 360         return(X509_PUBKEY_get(x->cert_info->key));
 361         }
 362
 363 ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)
 364         {
 365         if(!x) return NULL;
 366         return x->cert_info->key->public_key;
 367         }
 368
 369 int X509_check_private_key(X509 *x, EVP_PKEY *k)
 370         {
 371         EVP_PKEY *xk=NULL;
 372         int ok=0;
 373
 374         xk=X509_get_pubkey(x);
 375         if (xk->type != k->type)
 376             {
 377             X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_KEY_TYPE_MISMATCH);
 378             goto err;
 379             }
 380         switch (k->type)
 381                 {
 382 #ifndef OPENSSL_NO_RSA
 383         case EVP_PKEY_RSA:
 384                 if (BN_cmp(xk->pkey.rsa->n,k->pkey.rsa->n) != 0
 385                     || BN_cmp(xk->pkey.rsa->e,k->pkey.rsa->e) != 0)
 386                     {
 387                     X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_KEY_VALUES_MISMATCH);
 388                     goto err;
 389                     }
 390                 break;
 391 #endif
 392 #ifndef OPENSSL_NO_DSA
 393         case EVP_PKEY_DSA:
 394                 if (BN_cmp(xk->pkey.dsa->pub_key,k->pkey.dsa->pub_key) != 0)
 395                     {
 396                     X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_KEY_VALUES_MISMATCH);
 397                     goto err;
 398                     }
 399                 break;
 400 #endif
 401 #ifndef OPENSSL_NO_EC
 402         case EVP_PKEY_EC:
 403                 {
 404                 int  r = EC_POINT_cmp(xk->pkey.eckey->group,
 405                         xk->pkey.eckey->pub_key,k->pkey.eckey->pub_key,NULL);
 406                 if (r != 0)
 407                         {
 408                         if (r == 1)
 409                                 X509err(X509_F_X509_CHECK_PRIVATE_KEY, X509_R_KEY_VALUES_MISMATCH);
 410                         else
 411                                 X509err(X509_F_X509_CHECK_PRIVATE_KEY, ERR_R_EC_LIB);
 412
 413                         goto err;
 414                         }
 415                 }
 416                 break;
 417 #endif
 418 #ifndef OPENSSL_NO_DH
 419         case EVP_PKEY_DH:
 420                 /* No idea */
 421                 X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_CANT_CHECK_DH_KEY);
 422                 goto err;
 423 #endif
 424         default:
 425                 X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_UNKNOWN_KEY_TYPE);
 426                 goto err;
 427                 }
 428
 429         ok=1;
 430 err:
 431         EVP_PKEY_free(xk);
 432         return(ok);
 433         }