release/src/router/openssl/crypto/x509v3/v3_utl.c

   1 /* v3_utl.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   4  * project.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2003 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* X509 v3 extension utilities */
  60
  61 #include <stdio.h>
  62 #include <ctype.h>
  63 #include "cryptlib.h"
  64 #include <openssl/conf.h>
  65 #include <openssl/x509v3.h>
  66 #include <openssl/bn.h>
  67
  68 static char *strip_spaces(char *name);
  69 static int sk_strcmp(const char *const *a, const char *const *b);
  70 static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
  71                                            GENERAL_NAMES *gens);
  72 static void str_free(OPENSSL_STRING str);
  73 static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email);
  74
  75 static int ipv4_from_asc(unsigned char *v4, const char *in);
  76 static int ipv6_from_asc(unsigned char *v6, const char *in);
  77 static int ipv6_cb(const char *elem, int len, void *usr);
  78 static int ipv6_hex(unsigned char *out, const char *in, int inlen);
  79
  80 /* Add a CONF_VALUE name value pair to stack */
  81
  82 int X509V3_add_value(const char *name, const char *value,
  83                      STACK_OF(CONF_VALUE) **extlist)
  84 {
  85     CONF_VALUE *vtmp = NULL;
  86     char *tname = NULL, *tvalue = NULL;
  87     if (name && !(tname = BUF_strdup(name)))
  88         goto err;
  89     if (value && !(tvalue = BUF_strdup(value)))
  90         goto err;
  91     if (!(vtmp = (CONF_VALUE *)OPENSSL_malloc(sizeof(CONF_VALUE))))
  92         goto err;
  93     if (!*extlist && !(*extlist = sk_CONF_VALUE_new_null()))
  94         goto err;
  95     vtmp->section = NULL;
  96     vtmp->name = tname;
  97     vtmp->value = tvalue;
  98     if (!sk_CONF_VALUE_push(*extlist, vtmp))
  99         goto err;
 100     return 1;
 101  err:
 102     X509V3err(X509V3_F_X509V3_ADD_VALUE, ERR_R_MALLOC_FAILURE);
 103     if (vtmp)
 104         OPENSSL_free(vtmp);
 105     if (tname)
 106         OPENSSL_free(tname);
 107     if (tvalue)
 108         OPENSSL_free(tvalue);
 109     return 0;
 110 }
 111
 112 int X509V3_add_value_uchar(const char *name, const unsigned char *value,
 113                            STACK_OF(CONF_VALUE) **extlist)
 114 {
 115     return X509V3_add_value(name, (const char *)value, extlist);
 116 }
 117
 118 /* Free function for STACK_OF(CONF_VALUE) */
 119
 120 void X509V3_conf_free(CONF_VALUE *conf)
 121 {
 122     if (!conf)
 123         return;
 124     if (conf->name)
 125         OPENSSL_free(conf->name);
 126     if (conf->value)
 127         OPENSSL_free(conf->value);
 128     if (conf->section)
 129         OPENSSL_free(conf->section);
 130     OPENSSL_free(conf);
 131 }
 132
 133 int X509V3_add_value_bool(const char *name, int asn1_bool,
 134                           STACK_OF(CONF_VALUE) **extlist)
 135 {
 136     if (asn1_bool)
 137         return X509V3_add_value(name, "TRUE", extlist);
 138     return X509V3_add_value(name, "FALSE", extlist);
 139 }
 140
 141 int X509V3_add_value_bool_nf(char *name, int asn1_bool,
 142                              STACK_OF(CONF_VALUE) **extlist)
 143 {
 144     if (asn1_bool)
 145         return X509V3_add_value(name, "TRUE", extlist);
 146     return 1;
 147 }
 148
 149 char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, ASN1_ENUMERATED *a)
 150 {
 151     BIGNUM *bntmp = NULL;
 152     char *strtmp = NULL;
 153     if (!a)
 154         return NULL;
 155     if (!(bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) ||
 156         !(strtmp = BN_bn2dec(bntmp)))
 157         X509V3err(X509V3_F_I2S_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
 158     BN_free(bntmp);
 159     return strtmp;
 160 }
 161
 162 char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, ASN1_INTEGER *a)
 163 {
 164     BIGNUM *bntmp = NULL;
 165     char *strtmp = NULL;
 166     if (!a)
 167         return NULL;
 168     if (!(bntmp = ASN1_INTEGER_to_BN(a, NULL)) ||
 169         !(strtmp = BN_bn2dec(bntmp)))
 170         X509V3err(X509V3_F_I2S_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
 171     BN_free(bntmp);
 172     return strtmp;
 173 }
 174
 175 ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, char *value)
 176 {
 177     BIGNUM *bn = NULL;
 178     ASN1_INTEGER *aint;
 179     int isneg, ishex;
 180     int ret;
 181     if (!value) {
 182         X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_INVALID_NULL_VALUE);
 183         return 0;
 184     }
 185     bn = BN_new();
 186     if (value[0] == '-') {
 187         value++;
 188         isneg = 1;
 189     } else
 190         isneg = 0;
 191
 192     if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
 193         value += 2;
 194         ishex = 1;
 195     } else
 196         ishex = 0;
 197
 198     if (ishex)
 199         ret = BN_hex2bn(&bn, value);
 200     else
 201         ret = BN_dec2bn(&bn, value);
 202
 203     if (!ret || value[ret]) {
 204         BN_free(bn);
 205         X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_BN_DEC2BN_ERROR);
 206         return 0;
 207     }
 208
 209     if (isneg && BN_is_zero(bn))
 210         isneg = 0;
 211
 212     aint = BN_to_ASN1_INTEGER(bn, NULL);
 213     BN_free(bn);
 214     if (!aint) {
 215         X509V3err(X509V3_F_S2I_ASN1_INTEGER,
 216                   X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
 217         return 0;
 218     }
 219     if (isneg)
 220         aint->type |= V_ASN1_NEG;
 221     return aint;
 222 }
 223
 224 int X509V3_add_value_int(const char *name, ASN1_INTEGER *aint,
 225                          STACK_OF(CONF_VALUE) **extlist)
 226 {
 227     char *strtmp;
 228     int ret;
 229     if (!aint)
 230         return 1;
 231     if (!(strtmp = i2s_ASN1_INTEGER(NULL, aint)))
 232         return 0;
 233     ret = X509V3_add_value(name, strtmp, extlist);
 234     OPENSSL_free(strtmp);
 235     return ret;
 236 }
 237
 238 int X509V3_get_value_bool(CONF_VALUE *value, int *asn1_bool)
 239 {
 240     char *btmp;
 241     if (!(btmp = value->value))
 242         goto err;
 243     if (!strcmp(btmp, "TRUE") || !strcmp(btmp, "true")
 244         || !strcmp(btmp, "Y") || !strcmp(btmp, "y")
 245         || !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {
 246         *asn1_bool = 0xff;
 247         return 1;
 248     } else if (!strcmp(btmp, "FALSE") || !strcmp(btmp, "false")
 249                || !strcmp(btmp, "N") || !strcmp(btmp, "n")
 250                || !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {
 251         *asn1_bool = 0;
 252         return 1;
 253     }
 254  err:
 255     X509V3err(X509V3_F_X509V3_GET_VALUE_BOOL,
 256               X509V3_R_INVALID_BOOLEAN_STRING);
 257     X509V3_conf_err(value);
 258     return 0;
 259 }
 260
 261 int X509V3_get_value_int(CONF_VALUE *value, ASN1_INTEGER **aint)
 262 {
 263     ASN1_INTEGER *itmp;
 264     if (!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {
 265         X509V3_conf_err(value);
 266         return 0;
 267     }
 268     *aint = itmp;
 269     return 1;
 270 }
 271
 272 #define HDR_NAME        1
 273 #define HDR_VALUE       2
 274
 275 /*
 276  * #define DEBUG
 277  */
 278
 279 STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)
 280 {
 281     char *p, *q, c;
 282     char *ntmp, *vtmp;
 283     STACK_OF(CONF_VALUE) *values = NULL;
 284     char *linebuf;
 285     int state;
 286     /* We are going to modify the line so copy it first */
 287     linebuf = BUF_strdup(line);
 288     if (linebuf == NULL) {
 289         X509V3err(X509V3_F_X509V3_PARSE_LIST, ERR_R_MALLOC_FAILURE);
 290         goto err;
 291     }
 292     state = HDR_NAME;
 293     ntmp = NULL;
 294     /* Go through all characters */
 295     for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
 296          p++) {
 297
 298         switch (state) {
 299         case HDR_NAME:
 300             if (c == ':') {
 301                 state = HDR_VALUE;
 302                 *p = 0;
 303                 ntmp = strip_spaces(q);
 304                 if (!ntmp) {
 305                     X509V3err(X509V3_F_X509V3_PARSE_LIST,
 306                               X509V3_R_INVALID_NULL_NAME);
 307                     goto err;
 308                 }
 309                 q = p + 1;
 310             } else if (c == ',') {
 311                 *p = 0;
 312                 ntmp = strip_spaces(q);
 313                 q = p + 1;
 314 #if 0
 315                 printf("%s\n", ntmp);
 316 #endif
 317                 if (!ntmp) {
 318                     X509V3err(X509V3_F_X509V3_PARSE_LIST,
 319                               X509V3_R_INVALID_NULL_NAME);
 320                     goto err;
 321                 }
 322                 X509V3_add_value(ntmp, NULL, &values);
 323             }
 324             break;
 325
 326         case HDR_VALUE:
 327             if (c == ',') {
 328                 state = HDR_NAME;
 329                 *p = 0;
 330                 vtmp = strip_spaces(q);
 331 #if 0
 332                 printf("%s\n", ntmp);
 333 #endif
 334                 if (!vtmp) {
 335                     X509V3err(X509V3_F_X509V3_PARSE_LIST,
 336                               X509V3_R_INVALID_NULL_VALUE);
 337                     goto err;
 338                 }
 339                 X509V3_add_value(ntmp, vtmp, &values);
 340                 ntmp = NULL;
 341                 q = p + 1;
 342             }
 343
 344         }
 345     }
 346
 347     if (state == HDR_VALUE) {
 348         vtmp = strip_spaces(q);
 349 #if 0
 350         printf("%s=%s\n", ntmp, vtmp);
 351 #endif
 352         if (!vtmp) {
 353             X509V3err(X509V3_F_X509V3_PARSE_LIST,
 354                       X509V3_R_INVALID_NULL_VALUE);
 355             goto err;
 356         }
 357         X509V3_add_value(ntmp, vtmp, &values);
 358     } else {
 359         ntmp = strip_spaces(q);
 360 #if 0
 361         printf("%s\n", ntmp);
 362 #endif
 363         if (!ntmp) {
 364             X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
 365             goto err;
 366         }
 367         X509V3_add_value(ntmp, NULL, &values);
 368     }
 369     OPENSSL_free(linebuf);
 370     return values;
 371
 372  err:
 373     OPENSSL_free(linebuf);
 374     sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
 375     return NULL;
 376
 377 }
 378
 379 /* Delete leading and trailing spaces from a string */
 380 static char *strip_spaces(char *name)
 381 {
 382     char *p, *q;
 383     /* Skip over leading spaces */
 384     p = name;
 385     while (*p && isspace((unsigned char)*p))
 386         p++;
 387     if (!*p)
 388         return NULL;
 389     q = p + strlen(p) - 1;
 390     while ((q != p) && isspace((unsigned char)*q))
 391         q--;
 392     if (p != q)
 393         q[1] = 0;
 394     if (!*p)
 395         return NULL;
 396     return p;
 397 }
 398
 399 /* hex string utilities */
 400
 401 /*
 402  * Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
 403  * hex representation @@@ (Contents of buffer are always kept in ASCII, also
 404  * on EBCDIC machines)
 405  */
 406
 407 char *hex_to_string(const unsigned char *buffer, long len)
 408 {
 409     char *tmp, *q;
 410     const unsigned char *p;
 411     int i;
 412     const static char hexdig[] = "0123456789ABCDEF";
 413     if (!buffer || !len)
 414         return NULL;
 415     if (!(tmp = OPENSSL_malloc(len * 3 + 1))) {
 416         X509V3err(X509V3_F_HEX_TO_STRING, ERR_R_MALLOC_FAILURE);
 417         return NULL;
 418     }
 419     q = tmp;
 420     for (i = 0, p = buffer; i < len; i++, p++) {
 421         *q++ = hexdig[(*p >> 4) & 0xf];
 422         *q++ = hexdig[*p & 0xf];
 423         *q++ = ':';
 424     }
 425     q[-1] = 0;
 426 #ifdef CHARSET_EBCDIC
 427     ebcdic2ascii(tmp, tmp, q - tmp - 1);
 428 #endif
 429
 430     return tmp;
 431 }
 432
 433 /*
 434  * Give a string of hex digits convert to a buffer
 435  */
 436
 437 unsigned char *string_to_hex(const char *str, long *len)
 438 {
 439     unsigned char *hexbuf, *q;
 440     unsigned char ch, cl, *p;
 441     if (!str) {
 442         X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_INVALID_NULL_ARGUMENT);
 443         return NULL;
 444     }
 445     if (!(hexbuf = OPENSSL_malloc(strlen(str) >> 1)))
 446         goto err;
 447     for (p = (unsigned char *)str, q = hexbuf; *p;) {
 448         ch = *p++;
 449 #ifdef CHARSET_EBCDIC
 450         ch = os_toebcdic[ch];
 451 #endif
 452         if (ch == ':')
 453             continue;
 454         cl = *p++;
 455 #ifdef CHARSET_EBCDIC
 456         cl = os_toebcdic[cl];
 457 #endif
 458         if (!cl) {
 459             X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_ODD_NUMBER_OF_DIGITS);
 460             OPENSSL_free(hexbuf);
 461             return NULL;
 462         }
 463         if (isupper(ch))
 464             ch = tolower(ch);
 465         if (isupper(cl))
 466             cl = tolower(cl);
 467
 468         if ((ch >= '0') && (ch <= '9'))
 469             ch -= '0';
 470         else if ((ch >= 'a') && (ch <= 'f'))
 471             ch -= 'a' - 10;
 472         else
 473             goto badhex;
 474
 475         if ((cl >= '0') && (cl <= '9'))
 476             cl -= '0';
 477         else if ((cl >= 'a') && (cl <= 'f'))
 478             cl -= 'a' - 10;
 479         else
 480             goto badhex;
 481
 482         *q++ = (ch << 4) | cl;
 483     }
 484
 485     if (len)
 486         *len = q - hexbuf;
 487
 488     return hexbuf;
 489
 490  err:
 491     if (hexbuf)
 492         OPENSSL_free(hexbuf);
 493     X509V3err(X509V3_F_STRING_TO_HEX, ERR_R_MALLOC_FAILURE);
 494     return NULL;
 495
 496  badhex:
 497     OPENSSL_free(hexbuf);
 498     X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_ILLEGAL_HEX_DIGIT);
 499     return NULL;
 500
 501 }
 502
 503 /*
 504  * V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
 505  */
 506
 507 int name_cmp(const char *name, const char *cmp)
 508 {
 509     int len, ret;
 510     char c;
 511     len = strlen(cmp);
 512     if ((ret = strncmp(name, cmp, len)))
 513         return ret;
 514     c = name[len];
 515     if (!c || (c == '.'))
 516         return 0;
 517     return 1;
 518 }
 519
 520 static int sk_strcmp(const char *const *a, const char *const *b)
 521 {
 522     return strcmp(*a, *b);
 523 }
 524
 525 STACK_OF(OPENSSL_STRING) *X509_get1_email(X509 *x)
 526 {
 527     GENERAL_NAMES *gens;
 528     STACK_OF(OPENSSL_STRING) *ret;
 529
 530     gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
 531     ret = get_email(X509_get_subject_name(x), gens);
 532     sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
 533     return ret;
 534 }
 535
 536 STACK_OF(OPENSSL_STRING) *X509_get1_ocsp(X509 *x)
 537 {
 538     AUTHORITY_INFO_ACCESS *info;
 539     STACK_OF(OPENSSL_STRING) *ret = NULL;
 540     int i;
 541
 542     info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
 543     if (!info)
 544         return NULL;
 545     for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
 546         ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
 547         if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
 548             if (ad->location->type == GEN_URI) {
 549                 if (!append_ia5
 550                     (&ret, ad->location->d.uniformResourceIdentifier))
 551                     break;
 552             }
 553         }
 554     }
 555     AUTHORITY_INFO_ACCESS_free(info);
 556     return ret;
 557 }
 558
 559 STACK_OF(OPENSSL_STRING) *X509_REQ_get1_email(X509_REQ *x)
 560 {
 561     GENERAL_NAMES *gens;
 562     STACK_OF(X509_EXTENSION) *exts;
 563     STACK_OF(OPENSSL_STRING) *ret;
 564
 565     exts = X509_REQ_get_extensions(x);
 566     gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
 567     ret = get_email(X509_REQ_get_subject_name(x), gens);
 568     sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
 569     sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
 570     return ret;
 571 }
 572
 573 static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
 574                                            GENERAL_NAMES *gens)
 575 {
 576     STACK_OF(OPENSSL_STRING) *ret = NULL;
 577     X509_NAME_ENTRY *ne;
 578     ASN1_IA5STRING *email;
 579     GENERAL_NAME *gen;
 580     int i;
 581     /* Now add any email address(es) to STACK */
 582     i = -1;
 583     /* First supplied X509_NAME */
 584     while ((i = X509_NAME_get_index_by_NID(name,
 585                                            NID_pkcs9_emailAddress, i)) >= 0) {
 586         ne = X509_NAME_get_entry(name, i);
 587         email = X509_NAME_ENTRY_get_data(ne);
 588         if (!append_ia5(&ret, email))
 589             return NULL;
 590     }
 591     for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
 592         gen = sk_GENERAL_NAME_value(gens, i);
 593         if (gen->type != GEN_EMAIL)
 594             continue;
 595         if (!append_ia5(&ret, gen->d.ia5))
 596             return NULL;
 597     }
 598     return ret;
 599 }
 600
 601 static void str_free(OPENSSL_STRING str)
 602 {
 603     OPENSSL_free(str);
 604 }
 605
 606 static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email)
 607 {
 608     char *emtmp;
 609     /* First some sanity checks */
 610     if (email->type != V_ASN1_IA5STRING)
 611         return 1;
 612     if (!email->data || !email->length)
 613         return 1;
 614     if (!*sk)
 615         *sk = sk_OPENSSL_STRING_new(sk_strcmp);
 616     if (!*sk)
 617         return 0;
 618     /* Don't add duplicates */
 619     if (sk_OPENSSL_STRING_find(*sk, (char *)email->data) != -1)
 620         return 1;
 621     emtmp = BUF_strdup((char *)email->data);
 622     if (!emtmp || !sk_OPENSSL_STRING_push(*sk, emtmp)) {
 623         X509_email_free(*sk);
 624         *sk = NULL;
 625         return 0;
 626     }
 627     return 1;
 628 }
 629
 630 void X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
 631 {
 632     sk_OPENSSL_STRING_pop_free(sk, str_free);
 633 }
 634
 635 typedef int (*equal_fn) (const unsigned char *pattern, size_t pattern_len,
 636                          const unsigned char *subject, size_t subject_len,
 637                          unsigned int flags);
 638
 639 /* Skip pattern prefix to match "wildcard" subject */
 640 static void skip_prefix(const unsigned char **p, size_t *plen,
 641                         const unsigned char *subject, size_t subject_len,
 642                         unsigned int flags)
 643 {
 644     const unsigned char *pattern = *p;
 645     size_t pattern_len = *plen;
 646
 647     /*
 648      * If subject starts with a leading '.' followed by more octets, and
 649      * pattern is longer, compare just an equal-length suffix with the
 650      * full subject (starting at the '.'), provided the prefix contains
 651      * no NULs.
 652      */
 653     if ((flags & _X509_CHECK_FLAG_DOT_SUBDOMAINS) == 0)
 654         return;
 655
 656     while (pattern_len > subject_len && *pattern) {
 657         if ((flags & X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS) &&
 658             *pattern == '.')
 659             break;
 660         ++pattern;
 661         --pattern_len;
 662     }
 663
 664     /* Skip if entire prefix acceptable */
 665     if (pattern_len == subject_len) {
 666         *p = pattern;
 667         *plen = pattern_len;
 668     }
 669 }
 670
 671 /* Compare while ASCII ignoring case. */
 672 static int equal_nocase(const unsigned char *pattern, size_t pattern_len,
 673                         const unsigned char *subject, size_t subject_len,
 674                         unsigned int flags)
 675 {
 676     skip_prefix(&pattern, &pattern_len, subject, subject_len, flags);
 677     if (pattern_len != subject_len)
 678         return 0;
 679     while (pattern_len) {
 680         unsigned char l = *pattern;
 681         unsigned char r = *subject;
 682         /* The pattern must not contain NUL characters. */
 683         if (l == 0)
 684             return 0;
 685         if (l != r) {
 686             if ('A' <= l && l <= 'Z')
 687                 l = (l - 'A') + 'a';
 688             if ('A' <= r && r <= 'Z')
 689                 r = (r - 'A') + 'a';
 690             if (l != r)
 691                 return 0;
 692         }
 693         ++pattern;
 694         ++subject;
 695         --pattern_len;
 696     }
 697     return 1;
 698 }
 699
 700 /* Compare using memcmp. */
 701 static int equal_case(const unsigned char *pattern, size_t pattern_len,
 702                       const unsigned char *subject, size_t subject_len,
 703                       unsigned int flags)
 704 {
 705     skip_prefix(&pattern, &pattern_len, subject, subject_len, flags);
 706     if (pattern_len != subject_len)
 707         return 0;
 708     return !memcmp(pattern, subject, pattern_len);
 709 }
 710
 711 /*
 712  * RFC 5280, section 7.5, requires that only the domain is compared in a
 713  * case-insensitive manner.
 714  */
 715 static int equal_email(const unsigned char *a, size_t a_len,
 716                        const unsigned char *b, size_t b_len,
 717                        unsigned int unused_flags)
 718 {
 719     size_t i = a_len;
 720     if (a_len != b_len)
 721         return 0;
 722     /*
 723      * We search backwards for the '@' character, so that we do not have to
 724      * deal with quoted local-parts.  The domain part is compared in a
 725      * case-insensitive manner.
 726      */
 727     while (i > 0) {
 728         --i;
 729         if (a[i] == '@' || b[i] == '@') {
 730             if (!equal_nocase(a + i, a_len - i, b + i, a_len - i, 0))
 731                 return 0;
 732             break;
 733         }
 734     }
 735     if (i == 0)
 736         i = a_len;
 737     return equal_case(a, i, b, i, 0);
 738 }
 739
 740 /*
 741  * Compare the prefix and suffix with the subject, and check that the
 742  * characters in-between are valid.
 743  */
 744 static int wildcard_match(const unsigned char *prefix, size_t prefix_len,
 745                           const unsigned char *suffix, size_t suffix_len,
 746                           const unsigned char *subject, size_t subject_len,
 747                           unsigned int flags)
 748 {
 749     const unsigned char *wildcard_start;
 750     const unsigned char *wildcard_end;
 751     const unsigned char *p;
 752     int allow_multi = 0;
 753     int allow_idna = 0;
 754
 755     if (subject_len < prefix_len + suffix_len)
 756         return 0;
 757     if (!equal_nocase(prefix, prefix_len, subject, prefix_len, flags))
 758         return 0;
 759     wildcard_start = subject + prefix_len;
 760     wildcard_end = subject + (subject_len - suffix_len);
 761     if (!equal_nocase(wildcard_end, suffix_len, suffix, suffix_len, flags))
 762         return 0;
 763     /*
 764      * If the wildcard makes up the entire first label, it must match at
 765      * least one character.
 766      */
 767     if (prefix_len == 0 && *suffix == '.') {
 768         if (wildcard_start == wildcard_end)
 769             return 0;
 770         allow_idna = 1;
 771         if (flags & X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS)
 772             allow_multi = 1;
 773     }
 774     /* IDNA labels cannot match partial wildcards */
 775     if (!allow_idna &&
 776         subject_len >= 4 && strncasecmp((char *)subject, "xn--", 4) == 0)
 777         return 0;
 778     /* The wildcard may match a literal '*' */
 779     if (wildcard_end == wildcard_start + 1 && *wildcard_start == '*')
 780         return 1;
 781     /*
 782      * Check that the part matched by the wildcard contains only
 783      * permitted characters and only matches a single label unless
 784      * allow_multi is set.
 785      */
 786     for (p = wildcard_start; p != wildcard_end; ++p)
 787         if (!(('0' <= *p && *p <= '9') ||
 788               ('A' <= *p && *p <= 'Z') ||
 789               ('a' <= *p && *p <= 'z') ||
 790               *p == '-' || (allow_multi && *p == '.')))
 791             return 0;
 792     return 1;
 793 }
 794
 795 #define LABEL_START     (1 << 0)
 796 #define LABEL_END       (1 << 1)
 797 #define LABEL_HYPHEN    (1 << 2)
 798 #define LABEL_IDNA      (1 << 3)
 799
 800 static const unsigned char *valid_star(const unsigned char *p, size_t len,
 801                                        unsigned int flags)
 802 {
 803     const unsigned char *star = 0;
 804     size_t i;
 805     int state = LABEL_START;
 806     int dots = 0;
 807     for (i = 0; i < len; ++i) {
 808         /*
 809          * Locate first and only legal wildcard, either at the start
 810          * or end of a non-IDNA first and not final label.
 811          */
 812         if (p[i] == '*') {
 813             int atstart = (state & LABEL_START);
 814             int atend = (i == len - 1 || p[i + 1] == '.');
 815             /*-
 816              * At most one wildcard per pattern.
 817              * No wildcards in IDNA labels.
 818              * No wildcards after the first label.
 819              */
 820             if (star != NULL || (state & LABEL_IDNA) != 0 || dots)
 821                 return NULL;
 822             /* Only full-label '*.example.com' wildcards? */
 823             if ((flags & X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS)
 824                 && (!atstart || !atend))
 825                 return NULL;
 826             /* No 'foo*bar' wildcards */
 827             if (!atstart && !atend)
 828                 return NULL;
 829             star = &p[i];
 830             state &= ~LABEL_START;
 831         } else if (('a' <= p[i] && p[i] <= 'z')
 832                    || ('A' <= p[i] && p[i] <= 'Z')
 833                    || ('0' <= p[i] && p[i] <= '9')) {
 834             if ((state & LABEL_START) != 0
 835                 && len - i >= 4 && strncasecmp((char *)&p[i], "xn--", 4) == 0)
 836                 state |= LABEL_IDNA;
 837             state &= ~(LABEL_HYPHEN | LABEL_START);
 838         } else if (p[i] == '.') {
 839             if ((state & (LABEL_HYPHEN | LABEL_START)) != 0)
 840                 return NULL;
 841             state = LABEL_START;
 842             ++dots;
 843         } else if (p[i] == '-') {
 844             if ((state & LABEL_HYPHEN) != 0)
 845                 return NULL;
 846             state |= LABEL_HYPHEN;
 847         } else
 848             return NULL;
 849     }
 850
 851     /*
 852      * The final label must not end in a hyphen or ".", and
 853      * there must be at least two dots after the star.
 854      */
 855     if ((state & (LABEL_START | LABEL_HYPHEN)) != 0 || dots < 2)
 856         return NULL;
 857     return star;
 858 }
 859
 860 /* Compare using wildcards. */
 861 static int equal_wildcard(const unsigned char *pattern, size_t pattern_len,
 862                           const unsigned char *subject, size_t subject_len,
 863                           unsigned int flags)
 864 {
 865     const unsigned char *star = NULL;
 866
 867     /*
 868      * Subject names starting with '.' can only match a wildcard pattern
 869      * via a subject sub-domain pattern suffix match.
 870      */
 871     if (!(subject_len > 1 && subject[0] == '.'))
 872         star = valid_star(pattern, pattern_len, flags);
 873     if (star == NULL)
 874         return equal_nocase(pattern, pattern_len,
 875                             subject, subject_len, flags);
 876     return wildcard_match(pattern, star - pattern,
 877                           star + 1, (pattern + pattern_len) - star - 1,
 878                           subject, subject_len, flags);
 879 }
 880
 881 /*
 882  * Compare an ASN1_STRING to a supplied string. If they match return 1. If
 883  * cmp_type > 0 only compare if string matches the type, otherwise convert it
 884  * to UTF8.
 885  */
 886
 887 static int do_check_string(ASN1_STRING *a, int cmp_type, equal_fn equal,
 888                            unsigned int flags, const char *b, size_t blen,
 889                            char **peername)
 890 {
 891     int rv = 0;
 892
 893     if (!a->data || !a->length)
 894         return 0;
 895     if (cmp_type > 0) {
 896         if (cmp_type != a->type)
 897             return 0;
 898         if (cmp_type == V_ASN1_IA5STRING)
 899             rv = equal(a->data, a->length, (unsigned char *)b, blen, flags);
 900         else if (a->length == (int)blen && !memcmp(a->data, b, blen))
 901             rv = 1;
 902         if (rv > 0 && peername)
 903             *peername = BUF_strndup((char *)a->data, a->length);
 904     } else {
 905         int astrlen;
 906         unsigned char *astr;
 907         astrlen = ASN1_STRING_to_UTF8(&astr, a);
 908         if (astrlen < 0) {
 909             /*
 910              * -1 could be an internal malloc failure or a decoding error from
 911              * malformed input; we can't distinguish.
 912              */
 913             return -1;
 914         }
 915         rv = equal(astr, astrlen, (unsigned char *)b, blen, flags);
 916         if (rv > 0 && peername)
 917             *peername = BUF_strndup((char *)astr, astrlen);
 918         OPENSSL_free(astr);
 919     }
 920     return rv;
 921 }
 922
 923 static int do_x509_check(X509 *x, const char *chk, size_t chklen,
 924                          unsigned int flags, int check_type, char **peername)
 925 {
 926     GENERAL_NAMES *gens = NULL;
 927     X509_NAME *name = NULL;
 928     int i;
 929     int cnid;
 930     int alt_type;
 931     int san_present = 0;
 932     int rv = 0;
 933     equal_fn equal;
 934
 935     /* See below, this flag is internal-only */
 936     flags &= ~_X509_CHECK_FLAG_DOT_SUBDOMAINS;
 937     if (check_type == GEN_EMAIL) {
 938         cnid = NID_pkcs9_emailAddress;
 939         alt_type = V_ASN1_IA5STRING;
 940         equal = equal_email;
 941     } else if (check_type == GEN_DNS) {
 942         cnid = NID_commonName;
 943         /* Implicit client-side DNS sub-domain pattern */
 944         if (chklen > 1 && chk[0] == '.')
 945             flags |= _X509_CHECK_FLAG_DOT_SUBDOMAINS;
 946         alt_type = V_ASN1_IA5STRING;
 947         if (flags & X509_CHECK_FLAG_NO_WILDCARDS)
 948             equal = equal_nocase;
 949         else
 950             equal = equal_wildcard;
 951     } else {
 952         cnid = 0;
 953         alt_type = V_ASN1_OCTET_STRING;
 954         equal = equal_case;
 955     }
 956
 957     if (chklen == 0)
 958         chklen = strlen(chk);
 959
 960     gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
 961     if (gens) {
 962         for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
 963             GENERAL_NAME *gen;
 964             ASN1_STRING *cstr;
 965             gen = sk_GENERAL_NAME_value(gens, i);
 966             if (gen->type != check_type)
 967                 continue;
 968             san_present = 1;
 969             if (check_type == GEN_EMAIL)
 970                 cstr = gen->d.rfc822Name;
 971             else if (check_type == GEN_DNS)
 972                 cstr = gen->d.dNSName;
 973             else
 974                 cstr = gen->d.iPAddress;
 975             /* Positive on success, negative on error! */
 976             if ((rv = do_check_string(cstr, alt_type, equal, flags,
 977                                       chk, chklen, peername)) != 0)
 978                 break;
 979         }
 980         GENERAL_NAMES_free(gens);
 981         if (rv != 0)
 982             return rv;
 983         if (!cnid
 984             || (san_present
 985                 && !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT)))
 986             return 0;
 987     }
 988     i = -1;
 989     name = X509_get_subject_name(x);
 990     while ((i = X509_NAME_get_index_by_NID(name, cnid, i)) >= 0) {
 991         X509_NAME_ENTRY *ne;
 992         ASN1_STRING *str;
 993         ne = X509_NAME_get_entry(name, i);
 994         str = X509_NAME_ENTRY_get_data(ne);
 995         /* Positive on success, negative on error! */
 996         if ((rv = do_check_string(str, -1, equal, flags,
 997                                   chk, chklen, peername)) != 0)
 998             return rv;
 999     }
1000     return 0;
1001 }
1002
1003 int X509_check_host(X509 *x, const char *chk, size_t chklen,
1004                     unsigned int flags, char **peername)
1005 {
1006     if (chk == NULL)
1007         return -2;
1008     /*
1009      * Embedded NULs are disallowed, except as the last character of a
1010      * string of length 2 or more (tolerate caller including terminating
1011      * NUL in string length).
1012      */
1013     if (chklen == 0)
1014         chklen = strlen(chk);
1015     else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
1016         return -2;
1017     if (chklen > 1 && chk[chklen - 1] == '\0')
1018         --chklen;
1019     return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername);
1020 }
1021
1022 int X509_check_email(X509 *x, const char *chk, size_t chklen,
1023                      unsigned int flags)
1024 {
1025     if (chk == NULL)
1026         return -2;
1027     /*
1028      * Embedded NULs are disallowed, except as the last character of a
1029      * string of length 2 or more (tolerate caller including terminating
1030      * NUL in string length).
1031      */
1032     if (chklen == 0)
1033         chklen = strlen((char *)chk);
1034     else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
1035         return -2;
1036     if (chklen > 1 && chk[chklen - 1] == '\0')
1037         --chklen;
1038     return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL);
1039 }
1040
1041 int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
1042                   unsigned int flags)
1043 {
1044     if (chk == NULL)
1045         return -2;
1046     return do_x509_check(x, (char *)chk, chklen, flags, GEN_IPADD, NULL);
1047 }
1048
1049 int X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags)
1050 {
1051     unsigned char ipout[16];
1052     size_t iplen;
1053
1054     if (ipasc == NULL)
1055         return -2;
1056     iplen = (size_t)a2i_ipadd(ipout, ipasc);
1057     if (iplen == 0)
1058         return -2;
1059     return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL);
1060 }
1061
1062 /*
1063  * Convert IP addresses both IPv4 and IPv6 into an OCTET STRING compatible
1064  * with RFC3280.
1065  */
1066
1067 ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
1068 {
1069     unsigned char ipout[16];
1070     ASN1_OCTET_STRING *ret;
1071     int iplen;
1072
1073     /* If string contains a ':' assume IPv6 */
1074
1075     iplen = a2i_ipadd(ipout, ipasc);
1076
1077     if (!iplen)
1078         return NULL;
1079
1080     ret = ASN1_OCTET_STRING_new();
1081     if (!ret)
1082         return NULL;
1083     if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
1084         ASN1_OCTET_STRING_free(ret);
1085         return NULL;
1086     }
1087     return ret;
1088 }
1089
1090 ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
1091 {
1092     ASN1_OCTET_STRING *ret = NULL;
1093     unsigned char ipout[32];
1094     char *iptmp = NULL, *p;
1095     int iplen1, iplen2;
1096     p = strchr(ipasc, '/');
1097     if (!p)
1098         return NULL;
1099     iptmp = BUF_strdup(ipasc);
1100     if (!iptmp)
1101         return NULL;
1102     p = iptmp + (p - ipasc);
1103     *p++ = 0;
1104
1105     iplen1 = a2i_ipadd(ipout, iptmp);
1106
1107     if (!iplen1)
1108         goto err;
1109
1110     iplen2 = a2i_ipadd(ipout + iplen1, p);
1111
1112     OPENSSL_free(iptmp);
1113     iptmp = NULL;
1114
1115     if (!iplen2 || (iplen1 != iplen2))
1116         goto err;
1117
1118     ret = ASN1_OCTET_STRING_new();
1119     if (!ret)
1120         goto err;
1121     if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
1122         goto err;
1123
1124     return ret;
1125
1126  err:
1127     if (iptmp)
1128         OPENSSL_free(iptmp);
1129     if (ret)
1130         ASN1_OCTET_STRING_free(ret);
1131     return NULL;
1132 }
1133
1134 int a2i_ipadd(unsigned char *ipout, const char *ipasc)
1135 {
1136     /* If string contains a ':' assume IPv6 */
1137
1138     if (strchr(ipasc, ':')) {
1139         if (!ipv6_from_asc(ipout, ipasc))
1140             return 0;
1141         return 16;
1142     } else {
1143         if (!ipv4_from_asc(ipout, ipasc))
1144             return 0;
1145         return 4;
1146     }
1147 }
1148
1149 static int ipv4_from_asc(unsigned char *v4, const char *in)
1150 {
1151     int a0, a1, a2, a3;
1152     if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
1153         return 0;
1154     if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
1155         || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
1156         return 0;
1157     v4[0] = a0;
1158     v4[1] = a1;
1159     v4[2] = a2;
1160     v4[3] = a3;
1161     return 1;
1162 }
1163
1164 typedef struct {
1165     /* Temporary store for IPV6 output */
1166     unsigned char tmp[16];
1167     /* Total number of bytes in tmp */
1168     int total;
1169     /* The position of a zero (corresponding to '::') */
1170     int zero_pos;
1171     /* Number of zeroes */
1172     int zero_cnt;
1173 } IPV6_STAT;
1174
1175 static int ipv6_from_asc(unsigned char *v6, const char *in)
1176 {
1177     IPV6_STAT v6stat;
1178     v6stat.total = 0;
1179     v6stat.zero_pos = -1;
1180     v6stat.zero_cnt = 0;
1181     /*
1182      * Treat the IPv6 representation as a list of values separated by ':'.
1183      * The presence of a '::' will parse as one, two or three zero length
1184      * elements.
1185      */
1186     if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
1187         return 0;
1188
1189     /* Now for some sanity checks */
1190
1191     if (v6stat.zero_pos == -1) {
1192         /* If no '::' must have exactly 16 bytes */
1193         if (v6stat.total != 16)
1194             return 0;
1195     } else {
1196         /* If '::' must have less than 16 bytes */
1197         if (v6stat.total == 16)
1198             return 0;
1199         /* More than three zeroes is an error */
1200         if (v6stat.zero_cnt > 3)
1201             return 0;
1202         /* Can only have three zeroes if nothing else present */
1203         else if (v6stat.zero_cnt == 3) {
1204             if (v6stat.total > 0)
1205                 return 0;
1206         }
1207         /* Can only have two zeroes if at start or end */
1208         else if (v6stat.zero_cnt == 2) {
1209             if ((v6stat.zero_pos != 0)
1210                 && (v6stat.zero_pos != v6stat.total))
1211                 return 0;
1212         } else
1213             /* Can only have one zero if *not* start or end */
1214         {
1215             if ((v6stat.zero_pos == 0)
1216                 || (v6stat.zero_pos == v6stat.total))
1217                 return 0;
1218         }
1219     }
1220
1221     /* Format result */
1222
1223     if (v6stat.zero_pos >= 0) {
1224         /* Copy initial part */
1225         memcpy(v6, v6stat.tmp, v6stat.zero_pos);
1226         /* Zero middle */
1227         memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
1228         /* Copy final part */
1229         if (v6stat.total != v6stat.zero_pos)
1230             memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
1231                    v6stat.tmp + v6stat.zero_pos,
1232                    v6stat.total - v6stat.zero_pos);
1233     } else
1234         memcpy(v6, v6stat.tmp, 16);
1235
1236     return 1;
1237 }
1238
1239 static int ipv6_cb(const char *elem, int len, void *usr)
1240 {
1241     IPV6_STAT *s = usr;
1242     /* Error if 16 bytes written */
1243     if (s->total == 16)
1244         return 0;
1245     if (len == 0) {
1246         /* Zero length element, corresponds to '::' */
1247         if (s->zero_pos == -1)
1248             s->zero_pos = s->total;
1249         /* If we've already got a :: its an error */
1250         else if (s->zero_pos != s->total)
1251             return 0;
1252         s->zero_cnt++;
1253     } else {
1254         /* If more than 4 characters could be final a.b.c.d form */
1255         if (len > 4) {
1256             /* Need at least 4 bytes left */
1257             if (s->total > 12)
1258                 return 0;
1259             /* Must be end of string */
1260             if (elem[len])
1261                 return 0;
1262             if (!ipv4_from_asc(s->tmp + s->total, elem))
1263                 return 0;
1264             s->total += 4;
1265         } else {
1266             if (!ipv6_hex(s->tmp + s->total, elem, len))
1267                 return 0;
1268             s->total += 2;
1269         }
1270     }
1271     return 1;
1272 }
1273
1274 /*
1275  * Convert a string of up to 4 hex digits into the corresponding IPv6 form.
1276  */
1277
1278 static int ipv6_hex(unsigned char *out, const char *in, int inlen)
1279 {
1280     unsigned char c;
1281     unsigned int num = 0;
1282     if (inlen > 4)
1283         return 0;
1284     while (inlen--) {
1285         c = *in++;
1286         num <<= 4;
1287         if ((c >= '0') && (c <= '9'))
1288             num |= c - '0';
1289         else if ((c >= 'A') && (c <= 'F'))
1290             num |= c - 'A' + 10;
1291         else if ((c >= 'a') && (c <= 'f'))
1292             num |= c - 'a' + 10;
1293         else
1294             return 0;
1295     }
1296     out[0] = num >> 8;
1297     out[1] = num & 0xff;
1298     return 1;
1299 }
1300
1301 int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE) *dn_sk,
1302                              unsigned long chtype)
1303 {
1304     CONF_VALUE *v;
1305     int i, mval;
1306     char *p, *type;
1307     if (!nm)
1308         return 0;
1309
1310     for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
1311         v = sk_CONF_VALUE_value(dn_sk, i);
1312         type = v->name;
1313         /*
1314          * Skip past any leading X. X: X, etc to allow for multiple instances
1315          */
1316         for (p = type; *p; p++)
1317 #ifndef CHARSET_EBCDIC
1318             if ((*p == ':') || (*p == ',') || (*p == '.'))
1319 #else
1320             if ((*p == os_toascii[':']) || (*p == os_toascii[','])
1321                 || (*p == os_toascii['.']))
1322 #endif
1323             {
1324                 p++;
1325                 if (*p)
1326                     type = p;
1327                 break;
1328             }
1329 #ifndef CHARSET_EBCDIC
1330         if (*type == '+')
1331 #else
1332         if (*type == os_toascii['+'])
1333 #endif
1334         {
1335             mval = -1;
1336             type++;
1337         } else
1338             mval = 0;
1339         if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
1340                                         (unsigned char *)v->value, -1, -1,
1341                                         mval))
1342             return 0;
1343
1344     }
1345     return 1;
1346 }