crypto/x509v3/v3_utl.c

   1 /* v3_utl.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 1999.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58 /* X509 v3 extension utilities */
  59
  60
  61 #include <stdio.h>
  62 #include <ctype.h>
  63 #include "cryptlib.h"
  64 #include <openssl/conf.h>
  65 #include <openssl/x509v3.h>
  66
  67 static char *strip_spaces(char *name);
  68 static int sk_strcmp(const char * const *a, const char * const *b);
  69 static STACK *get_email(X509_NAME *name, GENERAL_NAMES *gens);
  70 static void str_free(void *str);
  71 static int append_ia5(STACK **sk, ASN1_IA5STRING *email);
  72
  73 /* Add a CONF_VALUE name value pair to stack */
  74
  75 int X509V3_add_value(const char *name, const char *value,
  76                                                 STACK_OF(CONF_VALUE) **extlist)
  77 {
  78         CONF_VALUE *vtmp = NULL;
  79         char *tname = NULL, *tvalue = NULL;
  80         if(name && !(tname = BUF_strdup(name))) goto err;
  81         if(value && !(tvalue = BUF_strdup(value))) goto err;;
  82         if(!(vtmp = (CONF_VALUE *)OPENSSL_malloc(sizeof(CONF_VALUE)))) goto err;
  83         if(!*extlist && !(*extlist = sk_CONF_VALUE_new_null())) goto err;
  84         vtmp->section = NULL;
  85         vtmp->name = tname;
  86         vtmp->value = tvalue;
  87         if(!sk_CONF_VALUE_push(*extlist, vtmp)) goto err;
  88         return 1;
  89         err:
  90         X509V3err(X509V3_F_X509V3_ADD_VALUE,ERR_R_MALLOC_FAILURE);
  91         if(vtmp) OPENSSL_free(vtmp);
  92         if(tname) OPENSSL_free(tname);
  93         if(tvalue) OPENSSL_free(tvalue);
  94         return 0;
  95 }
  96
  97 int X509V3_add_value_uchar(const char *name, const unsigned char *value,
  98                            STACK_OF(CONF_VALUE) **extlist)
  99     {
 100     return X509V3_add_value(name,(const char *)value,extlist);
 101     }
 102
 103 /* Free function for STACK_OF(CONF_VALUE) */
 104
 105 void X509V3_conf_free(CONF_VALUE *conf)
 106 {
 107         if(!conf) return;
 108         if(conf->name) OPENSSL_free(conf->name);
 109         if(conf->value) OPENSSL_free(conf->value);
 110         if(conf->section) OPENSSL_free(conf->section);
 111         OPENSSL_free(conf);
 112 }
 113
 114 int X509V3_add_value_bool(const char *name, int asn1_bool,
 115                                                 STACK_OF(CONF_VALUE) **extlist)
 116 {
 117         if(asn1_bool) return X509V3_add_value(name, "TRUE", extlist);
 118         return X509V3_add_value(name, "FALSE", extlist);
 119 }
 120
 121 int X509V3_add_value_bool_nf(char *name, int asn1_bool,
 122                                                 STACK_OF(CONF_VALUE) **extlist)
 123 {
 124         if(asn1_bool) return X509V3_add_value(name, "TRUE", extlist);
 125         return 1;
 126 }
 127
 128
 129 char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, ASN1_ENUMERATED *a)
 130 {
 131         BIGNUM *bntmp = NULL;
 132         char *strtmp = NULL;
 133         if(!a) return NULL;
 134         if(!(bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) ||
 135             !(strtmp = BN_bn2dec(bntmp)) )
 136                 X509V3err(X509V3_F_I2S_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE);
 137         BN_free(bntmp);
 138         return strtmp;
 139 }
 140
 141 char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, ASN1_INTEGER *a)
 142 {
 143         BIGNUM *bntmp = NULL;
 144         char *strtmp = NULL;
 145         if(!a) return NULL;
 146         if(!(bntmp = ASN1_INTEGER_to_BN(a, NULL)) ||
 147             !(strtmp = BN_bn2dec(bntmp)) )
 148                 X509V3err(X509V3_F_I2S_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
 149         BN_free(bntmp);
 150         return strtmp;
 151 }
 152
 153 ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, char *value)
 154 {
 155         BIGNUM *bn = NULL;
 156         ASN1_INTEGER *aint;
 157         int isneg, ishex;
 158         int ret;
 159         if (!value) {
 160                 X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_INVALID_NULL_VALUE);
 161                 return 0;
 162         }
 163         bn = BN_new();
 164         if (value[0] == '-') {
 165                 value++;
 166                 isneg = 1;
 167         } else isneg = 0;
 168
 169         if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
 170                 value += 2;
 171                 ishex = 1;
 172         } else ishex = 0;
 173
 174         if (ishex) ret = BN_hex2bn(&bn, value);
 175         else ret = BN_dec2bn(&bn, value);
 176
 177         if (!ret || value[ret]) {
 178                 BN_free(bn);
 179                 X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_BN_DEC2BN_ERROR);
 180                 return 0;
 181         }
 182
 183         if (isneg && BN_is_zero(bn)) isneg = 0;
 184
 185         aint = BN_to_ASN1_INTEGER(bn, NULL);
 186         BN_free(bn);
 187         if (!aint) {
 188                 X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
 189                 return 0;
 190         }
 191         if (isneg) aint->type |= V_ASN1_NEG;
 192         return aint;
 193 }
 194
 195 int X509V3_add_value_int(const char *name, ASN1_INTEGER *aint,
 196              STACK_OF(CONF_VALUE) **extlist)
 197 {
 198         char *strtmp;
 199         int ret;
 200         if(!aint) return 1;
 201         if(!(strtmp = i2s_ASN1_INTEGER(NULL, aint))) return 0;
 202         ret = X509V3_add_value(name, strtmp, extlist);
 203         OPENSSL_free(strtmp);
 204         return ret;
 205 }
 206
 207 int X509V3_get_value_bool(CONF_VALUE *value, int *asn1_bool)
 208 {
 209         char *btmp;
 210         if(!(btmp = value->value)) goto err;
 211         if(!strcmp(btmp, "TRUE") || !strcmp(btmp, "true")
 212                  || !strcmp(btmp, "Y") || !strcmp(btmp, "y")
 213                 || !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {
 214                 *asn1_bool = 0xff;
 215                 return 1;
 216         } else if(!strcmp(btmp, "FALSE") || !strcmp(btmp, "false")
 217                  || !strcmp(btmp, "N") || !strcmp(btmp, "n")
 218                 || !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {
 219                 *asn1_bool = 0;
 220                 return 1;
 221         }
 222         err:
 223         X509V3err(X509V3_F_X509V3_GET_VALUE_BOOL,X509V3_R_INVALID_BOOLEAN_STRING);
 224         X509V3_conf_err(value);
 225         return 0;
 226 }
 227
 228 int X509V3_get_value_int(CONF_VALUE *value, ASN1_INTEGER **aint)
 229 {
 230         ASN1_INTEGER *itmp;
 231         if(!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {
 232                 X509V3_conf_err(value);
 233                 return 0;
 234         }
 235         *aint = itmp;
 236         return 1;
 237 }
 238
 239 #define HDR_NAME        1
 240 #define HDR_VALUE       2
 241
 242 /*#define DEBUG*/
 243
 244 STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)
 245 {
 246         char *p, *q, c;
 247         char *ntmp, *vtmp;
 248         STACK_OF(CONF_VALUE) *values = NULL;
 249         char *linebuf;
 250         int state;
 251         /* We are going to modify the line so copy it first */
 252         linebuf = BUF_strdup(line);
 253         state = HDR_NAME;
 254         ntmp = NULL;
 255         /* Go through all characters */
 256         for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {
 257
 258                 switch(state) {
 259                         case HDR_NAME:
 260                         if(c == ':') {
 261                                 state = HDR_VALUE;
 262                                 *p = 0;
 263                                 ntmp = strip_spaces(q);
 264                                 if(!ntmp) {
 265                                         X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
 266                                         goto err;
 267                                 }
 268                                 q = p + 1;
 269                         } else if(c == ',') {
 270                                 *p = 0;
 271                                 ntmp = strip_spaces(q);
 272                                 q = p + 1;
 273 #if 0
 274                                 printf("%s\n", ntmp);
 275 #endif
 276                                 if(!ntmp) {
 277                                         X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
 278                                         goto err;
 279                                 }
 280                                 X509V3_add_value(ntmp, NULL, &values);
 281                         }
 282                         break ;
 283
 284                         case HDR_VALUE:
 285                         if(c == ',') {
 286                                 state = HDR_NAME;
 287                                 *p = 0;
 288                                 vtmp = strip_spaces(q);
 289 #if 0
 290                                 printf("%s\n", ntmp);
 291 #endif
 292                                 if(!vtmp) {
 293                                         X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_VALUE);
 294                                         goto err;
 295                                 }
 296                                 X509V3_add_value(ntmp, vtmp, &values);
 297                                 ntmp = NULL;
 298                                 q = p + 1;
 299                         }
 300
 301                 }
 302         }
 303
 304         if(state == HDR_VALUE) {
 305                 vtmp = strip_spaces(q);
 306 #if 0
 307                 printf("%s=%s\n", ntmp, vtmp);
 308 #endif
 309                 if(!vtmp) {
 310                         X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_VALUE);
 311                         goto err;
 312                 }
 313                 X509V3_add_value(ntmp, vtmp, &values);
 314         } else {
 315                 ntmp = strip_spaces(q);
 316 #if 0
 317                 printf("%s\n", ntmp);
 318 #endif
 319                 if(!ntmp) {
 320                         X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
 321                         goto err;
 322                 }
 323                 X509V3_add_value(ntmp, NULL, &values);
 324         }
 325 OPENSSL_free(linebuf);
 326 return values;
 327
 328 err:
 329 OPENSSL_free(linebuf);
 330 sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
 331 return NULL;
 332
 333 }
 334
 335 /* Delete leading and trailing spaces from a string */
 336 static char *strip_spaces(char *name)
 337 {
 338         char *p, *q;
 339         /* Skip over leading spaces */
 340         p = name;
 341         while(*p && isspace((unsigned char)*p)) p++;
 342         if(!*p) return NULL;
 343         q = p + strlen(p) - 1;
 344         while((q != p) && isspace((unsigned char)*q)) q--;
 345         if(p != q) q[1] = 0;
 346         if(!*p) return NULL;
 347         return p;
 348 }
 349
 350 /* hex string utilities */
 351
 352 /* Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
 353  * hex representation
 354  * @@@ (Contents of buffer are always kept in ASCII, also on EBCDIC machines)
 355  */
 356
 357 char *hex_to_string(unsigned char *buffer, long len)
 358 {
 359         char *tmp, *q;
 360         unsigned char *p;
 361         int i;
 362         static char hexdig[] = "0123456789ABCDEF";
 363         if(!buffer || !len) return NULL;
 364         if(!(tmp = OPENSSL_malloc(len * 3 + 1))) {
 365                 X509V3err(X509V3_F_HEX_TO_STRING,ERR_R_MALLOC_FAILURE);
 366                 return NULL;
 367         }
 368         q = tmp;
 369         for(i = 0, p = buffer; i < len; i++,p++) {
 370                 *q++ = hexdig[(*p >> 4) & 0xf];
 371                 *q++ = hexdig[*p & 0xf];
 372                 *q++ = ':';
 373         }
 374         q[-1] = 0;
 375 #ifdef CHARSET_EBCDIC
 376         ebcdic2ascii(tmp, tmp, q - tmp - 1);
 377 #endif
 378
 379         return tmp;
 380 }
 381
 382 /* Give a string of hex digits convert to
 383  * a buffer
 384  */
 385
 386 unsigned char *string_to_hex(char *str, long *len)
 387 {
 388         unsigned char *hexbuf, *q;
 389         unsigned char ch, cl, *p;
 390         if(!str) {
 391                 X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_INVALID_NULL_ARGUMENT);
 392                 return NULL;
 393         }
 394         if(!(hexbuf = OPENSSL_malloc(strlen(str) >> 1))) goto err;
 395         for(p = (unsigned char *)str, q = hexbuf; *p;) {
 396                 ch = *p++;
 397 #ifdef CHARSET_EBCDIC
 398                 ch = os_toebcdic[ch];
 399 #endif
 400                 if(ch == ':') continue;
 401                 cl = *p++;
 402 #ifdef CHARSET_EBCDIC
 403                 cl = os_toebcdic[cl];
 404 #endif
 405                 if(!cl) {
 406                         X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_ODD_NUMBER_OF_DIGITS);
 407                         OPENSSL_free(hexbuf);
 408                         return NULL;
 409                 }
 410                 if(isupper(ch)) ch = tolower(ch);
 411                 if(isupper(cl)) cl = tolower(cl);
 412
 413                 if((ch >= '0') && (ch <= '9')) ch -= '0';
 414                 else if ((ch >= 'a') && (ch <= 'f')) ch -= 'a' - 10;
 415                 else goto badhex;
 416
 417                 if((cl >= '0') && (cl <= '9')) cl -= '0';
 418                 else if ((cl >= 'a') && (cl <= 'f')) cl -= 'a' - 10;
 419                 else goto badhex;
 420
 421                 *q++ = (ch << 4) | cl;
 422         }
 423
 424         if(len) *len = q - hexbuf;
 425
 426         return hexbuf;
 427
 428         err:
 429         if(hexbuf) OPENSSL_free(hexbuf);
 430         X509V3err(X509V3_F_STRING_TO_HEX,ERR_R_MALLOC_FAILURE);
 431         return NULL;
 432
 433         badhex:
 434         OPENSSL_free(hexbuf);
 435         X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_ILLEGAL_HEX_DIGIT);
 436         return NULL;
 437
 438 }
 439
 440 /* V2I name comparison function: returns zero if 'name' matches
 441  * cmp or cmp.*
 442  */
 443
 444 int name_cmp(const char *name, const char *cmp)
 445 {
 446         int len, ret;
 447         char c;
 448         len = strlen(cmp);
 449         if((ret = strncmp(name, cmp, len))) return ret;
 450         c = name[len];
 451         if(!c || (c=='.')) return 0;
 452         return 1;
 453 }
 454
 455 static int sk_strcmp(const char * const *a, const char * const *b)
 456 {
 457         return strcmp(*a, *b);
 458 }
 459
 460 STACK *X509_get1_email(X509 *x)
 461 {
 462         GENERAL_NAMES *gens;
 463         STACK *ret;
 464         gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
 465         ret = get_email(X509_get_subject_name(x), gens);
 466         sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
 467         return ret;
 468 }
 469
 470 STACK *X509_REQ_get1_email(X509_REQ *x)
 471 {
 472         GENERAL_NAMES *gens;
 473         STACK_OF(X509_EXTENSION) *exts;
 474         STACK *ret;
 475         exts = X509_REQ_get_extensions(x);
 476         gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
 477         ret = get_email(X509_REQ_get_subject_name(x), gens);
 478         sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
 479         sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
 480         return ret;
 481 }
 482
 483
 484 static STACK *get_email(X509_NAME *name, GENERAL_NAMES *gens)
 485 {
 486         STACK *ret = NULL;
 487         X509_NAME_ENTRY *ne;
 488         ASN1_IA5STRING *email;
 489         GENERAL_NAME *gen;
 490         int i;
 491         /* Now add any email address(es) to STACK */
 492         i = -1;
 493         /* First supplied X509_NAME */
 494         while((i = X509_NAME_get_index_by_NID(name,
 495                                          NID_pkcs9_emailAddress, i)) >= 0) {
 496                 ne = X509_NAME_get_entry(name, i);
 497                 email = X509_NAME_ENTRY_get_data(ne);
 498                 if(!append_ia5(&ret, email)) return NULL;
 499         }
 500         for(i = 0; i < sk_GENERAL_NAME_num(gens); i++)
 501         {
 502                 gen = sk_GENERAL_NAME_value(gens, i);
 503                 if(gen->type != GEN_EMAIL) continue;
 504                 if(!append_ia5(&ret, gen->d.ia5)) return NULL;
 505         }
 506         return ret;
 507 }
 508
 509 static void str_free(void *str)
 510 {
 511         OPENSSL_free(str);
 512 }
 513
 514 static int append_ia5(STACK **sk, ASN1_IA5STRING *email)
 515 {
 516         char *emtmp;
 517         /* First some sanity checks */
 518         if(email->type != V_ASN1_IA5STRING) return 1;
 519         if(!email->data || !email->length) return 1;
 520         if(!*sk) *sk = sk_new(sk_strcmp);
 521         if(!*sk) return 0;
 522         /* Don't add duplicates */
 523         if(sk_find(*sk, (char *)email->data) != -1) return 1;
 524         emtmp = BUF_strdup((char *)email->data);
 525         if(!emtmp || !sk_push(*sk, emtmp)) {
 526                 X509_email_free(*sk);
 527                 *sk = NULL;
 528                 return 0;
 529         }
 530         return 1;
 531 }
 532
 533 void X509_email_free(STACK *sk)
 534 {
 535         sk_pop_free(sk, str_free);
 536 }