crypto/openssl-0.9/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 *f;
  86
  87         EVP_MD_CTX_init(&ctx);
  88         f=X509_NAME_oneline(a->cert_info->issuer,NULL,0);
  89         ret=strlen(f);
  90         EVP_DigestInit_ex(&ctx, EVP_md5(), NULL);
  91         EVP_DigestUpdate(&ctx,(unsigned char *)f,ret);
  92         OPENSSL_free(f);
  93         EVP_DigestUpdate(&ctx,(unsigned char *)a->cert_info->serialNumber->data,
  94                 (unsigned long)a->cert_info->serialNumber->length);
  95         EVP_DigestFinal_ex(&ctx,&(md[0]),NULL);
  96         ret=(   ((unsigned long)md[0]     )|((unsigned long)md[1]<<8L)|
  97                 ((unsigned long)md[2]<<16L)|((unsigned long)md[3]<<24L)
  98                 )&0xffffffffL;
  99         EVP_MD_CTX_cleanup(&ctx);
 100         return(ret);
 101         }
 102 #endif
 103
 104 int X509_issuer_name_cmp(const X509 *a, const X509 *b)
 105         {
 106         return(X509_NAME_cmp(a->cert_info->issuer,b->cert_info->issuer));
 107         }
 108
 109 int X509_subject_name_cmp(const X509 *a, const X509 *b)
 110         {
 111         return(X509_NAME_cmp(a->cert_info->subject,b->cert_info->subject));
 112         }
 113
 114 int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b)
 115         {
 116         return(X509_NAME_cmp(a->crl->issuer,b->crl->issuer));
 117         }
 118
 119 X509_NAME *X509_get_issuer_name(X509 *a)
 120         {
 121         return(a->cert_info->issuer);
 122         }
 123
 124 unsigned long X509_issuer_name_hash(X509 *x)
 125         {
 126         return(X509_NAME_hash(x->cert_info->issuer));
 127         }
 128
 129 X509_NAME *X509_get_subject_name(X509 *a)
 130         {
 131         return(a->cert_info->subject);
 132         }
 133
 134 ASN1_INTEGER *X509_get_serialNumber(X509 *a)
 135         {
 136         return(a->cert_info->serialNumber);
 137         }
 138
 139 unsigned long X509_subject_name_hash(X509 *x)
 140         {
 141         return(X509_NAME_hash(x->cert_info->subject));
 142         }
 143
 144 #ifndef OPENSSL_NO_SHA
 145 /* Compare two certificates: they must be identical for
 146  * this to work. NB: Although "cmp" operations are generally
 147  * prototyped to take "const" arguments (eg. for use in
 148  * STACKs), the way X509 handling is - these operations may
 149  * involve ensuring the hashes are up-to-date and ensuring
 150  * certain cert information is cached. So this is the point
 151  * where the "depth-first" constification tree has to halt
 152  * with an evil cast.
 153  */
 154 int X509_cmp(const X509 *a, const X509 *b)
 155 {
 156         /* ensure hash is valid */
 157         X509_check_purpose((X509 *)a, -1, 0);
 158         X509_check_purpose((X509 *)b, -1, 0);
 159
 160         return memcmp(a->sha1_hash, b->sha1_hash, SHA_DIGEST_LENGTH);
 161 }
 162 #endif
 163
 164
 165 /* Case insensitive string comparision */
 166 static int nocase_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 167 {
 168         int i;
 169
 170         if (a->length != b->length)
 171                 return (a->length - b->length);
 172
 173         for (i=0; i<a->length; i++)
 174         {
 175                 int ca, cb;
 176
 177                 ca = tolower(a->data[i]);
 178                 cb = tolower(b->data[i]);
 179
 180                 if (ca != cb)
 181                         return(ca-cb);
 182         }
 183         return 0;
 184 }
 185
 186 /* Case insensitive string comparision with space normalization
 187  * Space normalization - ignore leading, trailing spaces,
 188  *       multiple spaces between characters are replaced by single space
 189  */
 190 static int nocase_spacenorm_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
 191 {
 192         unsigned char *pa = NULL, *pb = NULL;
 193         int la, lb;
 194
 195         la = a->length;
 196         lb = b->length;
 197         pa = a->data;
 198         pb = b->data;
 199
 200         /* skip leading spaces */
 201         while (la > 0 && isspace(*pa))
 202         {
 203                 la--;
 204                 pa++;
 205         }
 206         while (lb > 0 && isspace(*pb))
 207         {
 208                 lb--;
 209                 pb++;
 210         }
 211
 212         /* skip trailing spaces */
 213         while (la > 0 && isspace(pa[la-1]))
 214                 la--;
 215         while (lb > 0 && isspace(pb[lb-1]))
 216                 lb--;
 217
 218         /* compare strings with space normalization */
 219         while (la > 0 && lb > 0)
 220         {
 221                 int ca, cb;
 222
 223                 /* compare character */
 224                 ca = tolower(*pa);
 225                 cb = tolower(*pb);
 226                 if (ca != cb)
 227                         return (ca - cb);
 228
 229                 pa++; pb++;
 230                 la--; lb--;
 231
 232                 if (la <= 0 || lb <= 0)
 233                         break;
 234
 235                 /* is white space next character ? */
 236                 if (isspace(*pa) && isspace(*pb))
 237                 {
 238                         /* skip remaining white spaces */
 239                         while (la > 0 && isspace(*pa))
 240                         {
 241                                 la--;
 242                                 pa++;
 243                         }
 244                         while (lb > 0 && isspace(*pb))
 245                         {
 246                                 lb--;
 247                                 pb++;
 248                         }
 249                 }
 250         }
 251         if (la > 0 || lb > 0)
 252                 return la - lb;
 253
 254         return 0;
 255 }
 256
 257 static int asn1_string_memcmp(ASN1_STRING *a, ASN1_STRING *b)
 258         {
 259         int j;
 260         j = a->length - b->length;
 261         if (j)
 262                 return j;
 263         return memcmp(a->data, b->data, a->length);
 264         }
 265
 266 #define STR_TYPE_CMP (B_ASN1_PRINTABLESTRING|B_ASN1_T61STRING|B_ASN1_UTF8STRING)
 267
 268 int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b)
 269         {
 270         int i,j;
 271         X509_NAME_ENTRY *na,*nb;
 272
 273         unsigned long nabit, nbbit;
 274
 275         j = sk_X509_NAME_ENTRY_num(a->entries)
 276                   - sk_X509_NAME_ENTRY_num(b->entries);
 277         if (j)
 278                 return j;
 279         for (i=sk_X509_NAME_ENTRY_num(a->entries)-1; i>=0; i--)
 280                 {
 281                 na=sk_X509_NAME_ENTRY_value(a->entries,i);
 282                 nb=sk_X509_NAME_ENTRY_value(b->entries,i);
 283                 j=na->value->type-nb->value->type;
 284                 if (j)
 285                         {
 286                         nabit = ASN1_tag2bit(na->value->type);
 287                         nbbit = ASN1_tag2bit(nb->value->type);
 288                         if (!(nabit & STR_TYPE_CMP) ||
 289                                 !(nbbit & STR_TYPE_CMP))
 290                                 return j;
 291                         j = asn1_string_memcmp(na->value, nb->value);
 292                         }
 293                 else if (na->value->type == V_ASN1_PRINTABLESTRING)
 294                         j=nocase_spacenorm_cmp(na->value, nb->value);
 295                 else if (na->value->type == V_ASN1_IA5STRING
 296                         && OBJ_obj2nid(na->object) == NID_pkcs9_emailAddress)
 297                         j=nocase_cmp(na->value, nb->value);
 298                 else
 299                         j = asn1_string_memcmp(na->value, nb->value);
 300                 if (j) return(j);
 301                 j=na->set-nb->set;
 302                 if (j) return(j);
 303                 }
 304
 305         /* We will check the object types after checking the values
 306          * since the values will more often be different than the object
 307          * types. */
 308         for (i=sk_X509_NAME_ENTRY_num(a->entries)-1; i>=0; i--)
 309                 {
 310                 na=sk_X509_NAME_ENTRY_value(a->entries,i);
 311                 nb=sk_X509_NAME_ENTRY_value(b->entries,i);
 312                 j=OBJ_cmp(na->object,nb->object);
 313                 if (j) return(j);
 314                 }
 315         return(0);
 316         }
 317
 318 #ifndef OPENSSL_NO_MD5
 319 /* I now DER encode the name and hash it.  Since I cache the DER encoding,
 320  * this is reasonably efficient. */
 321 unsigned long X509_NAME_hash(X509_NAME *x)
 322         {
 323         unsigned long ret=0;
 324         unsigned char md[16];
 325
 326         /* Make sure X509_NAME structure contains valid cached encoding */
 327         i2d_X509_NAME(x,NULL);
 328         EVP_Digest(x->bytes->data, x->bytes->length, md, NULL, EVP_md5(), NULL);
 329
 330         ret=(   ((unsigned long)md[0]     )|((unsigned long)md[1]<<8L)|
 331                 ((unsigned long)md[2]<<16L)|((unsigned long)md[3]<<24L)
 332                 )&0xffffffffL;
 333         return(ret);
 334         }
 335 #endif
 336
 337 /* Search a stack of X509 for a match */
 338 X509 *X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name,
 339                 ASN1_INTEGER *serial)
 340         {
 341         int i;
 342         X509_CINF cinf;
 343         X509 x,*x509=NULL;
 344
 345         if(!sk) return NULL;
 346
 347         x.cert_info= &cinf;
 348         cinf.serialNumber=serial;
 349         cinf.issuer=name;
 350
 351         for (i=0; i<sk_X509_num(sk); i++)
 352                 {
 353                 x509=sk_X509_value(sk,i);
 354                 if (X509_issuer_and_serial_cmp(x509,&x) == 0)
 355                         return(x509);
 356                 }
 357         return(NULL);
 358         }
 359
 360 X509 *X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name)
 361         {
 362         X509 *x509;
 363         int i;
 364
 365         for (i=0; i<sk_X509_num(sk); i++)
 366                 {
 367                 x509=sk_X509_value(sk,i);
 368                 if (X509_NAME_cmp(X509_get_subject_name(x509),name) == 0)
 369                         return(x509);
 370                 }
 371         return(NULL);
 372         }
 373
 374 EVP_PKEY *X509_get_pubkey(X509 *x)
 375         {
 376         if ((x == NULL) || (x->cert_info == NULL))
 377                 return(NULL);
 378         return(X509_PUBKEY_get(x->cert_info->key));
 379         }
 380
 381 ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)
 382         {
 383         if(!x) return NULL;
 384         return x->cert_info->key->public_key;
 385         }
 386
 387 int X509_check_private_key(X509 *x, EVP_PKEY *k)
 388         {
 389         EVP_PKEY *xk=NULL;
 390         int ok=0;
 391
 392         xk=X509_get_pubkey(x);
 393         switch (EVP_PKEY_cmp(xk, k))
 394                 {
 395         case 1:
 396                 ok=1;
 397                 break;
 398         case 0:
 399                 X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_KEY_VALUES_MISMATCH);
 400                 break;
 401         case -1:
 402                 X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_KEY_TYPE_MISMATCH);
 403                 break;
 404         case -2:
 405 #ifndef OPENSSL_NO_EC
 406                 if (k->type == EVP_PKEY_EC)
 407                         {
 408                         X509err(X509_F_X509_CHECK_PRIVATE_KEY, ERR_R_EC_LIB);
 409                         break;
 410                         }
 411 #endif
 412 #ifndef OPENSSL_NO_DH
 413                 if (k->type == EVP_PKEY_DH)
 414                         {
 415                         /* No idea */
 416                         X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_CANT_CHECK_DH_KEY);
 417                         break;
 418                         }
 419 #endif
 420                 X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_UNKNOWN_KEY_TYPE);
 421                 }
 422
 423         EVP_PKEY_free(xk);
 424         return(ok);
 425         }