lib/libcrypto/asn1/a_mbstr.c

   1 /* $OpenBSD: a_mbstr.c,v 1.23 2017/01/29 17:49:22 beck Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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
  59 #include <ctype.h>
  60 #include <stdio.h>
  61 #include <string.h>
  62
  63 #include <openssl/asn1.h>
  64 #include <openssl/err.h>
  65
  66 #include "asn1_locl.h"
  67
  68 static int traverse_string(const unsigned char *p, int len, int inform,
  69     int (*rfunc)(unsigned long value, void *in), void *arg);
  70 static int in_utf8(unsigned long value, void *arg);
  71 static int out_utf8(unsigned long value, void *arg);
  72 static int type_str(unsigned long value, void *arg);
  73 static int cpy_asc(unsigned long value, void *arg);
  74 static int cpy_bmp(unsigned long value, void *arg);
  75 static int cpy_univ(unsigned long value, void *arg);
  76 static int cpy_utf8(unsigned long value, void *arg);
  77 static int is_printable(unsigned long value);
  78
  79 /* These functions take a string in UTF8, ASCII or multibyte form and
  80  * a mask of permissible ASN1 string types. It then works out the minimal
  81  * type (using the order Printable < IA5 < T61 < BMP < Universal < UTF8)
  82  * and creates a string of the correct type with the supplied data.
  83  * Yes this is horrible: it has to be :-(
  84  * The 'ncopy' form checks minimum and maximum size limits too.
  85  */
  86
  87 int
  88 ASN1_mbstring_copy(ASN1_STRING **out, const unsigned char *in, int len,
  89     int inform, unsigned long mask)
  90 {
  91         return ASN1_mbstring_ncopy(out, in, len, inform, mask, 0, 0);
  92 }
  93
  94 int
  95 ASN1_mbstring_ncopy(ASN1_STRING **out, const unsigned char *in, int len,
  96     int inform, unsigned long mask, long minsize, long maxsize)
  97 {
  98         int str_type;
  99         int ret;
 100         char free_out;
 101         int outform, outlen = 0;
 102         ASN1_STRING *dest;
 103         unsigned char *p;
 104         int nchar;
 105         int (*cpyfunc)(unsigned long, void *) = NULL;
 106
 107         if (len < 0)
 108                 len = strlen((const char *)in);
 109         if (!mask)
 110                 mask = DIRSTRING_TYPE;
 111
 112         /* First do a string check and work out the number of characters */
 113         switch (inform) {
 114         case MBSTRING_BMP:
 115                 if (len & 1) {
 116                         ASN1error(ASN1_R_INVALID_BMPSTRING_LENGTH);
 117                         return -1;
 118                 }
 119                 nchar = len >> 1;
 120                 break;
 121
 122         case MBSTRING_UNIV:
 123                 if (len & 3) {
 124                         ASN1error(ASN1_R_INVALID_UNIVERSALSTRING_LENGTH);
 125                         return -1;
 126                 }
 127                 nchar = len >> 2;
 128                 break;
 129
 130         case MBSTRING_UTF8:
 131                 nchar = 0;
 132                 /* This counts the characters and does utf8 syntax checking */
 133                 ret = traverse_string(in, len, MBSTRING_UTF8, in_utf8, &nchar);
 134                 if (ret < 0) {
 135                         ASN1error(ASN1_R_INVALID_UTF8STRING);
 136                         return -1;
 137                 }
 138                 break;
 139
 140         case MBSTRING_ASC:
 141                 nchar = len;
 142                 break;
 143
 144         default:
 145                 ASN1error(ASN1_R_UNKNOWN_FORMAT);
 146                 return -1;
 147         }
 148
 149         if ((minsize > 0) && (nchar < minsize)) {
 150                 ASN1error(ASN1_R_STRING_TOO_SHORT);
 151                 ERR_asprintf_error_data("minsize=%ld", minsize);
 152                 return -1;
 153         }
 154
 155         if ((maxsize > 0) && (nchar > maxsize)) {
 156                 ASN1error(ASN1_R_STRING_TOO_LONG);
 157                 ERR_asprintf_error_data("maxsize=%ld", maxsize);
 158                 return -1;
 159         }
 160
 161         /* Now work out minimal type (if any) */
 162         if (traverse_string(in, len, inform, type_str, &mask) < 0) {
 163                 ASN1error(ASN1_R_ILLEGAL_CHARACTERS);
 164                 return -1;
 165         }
 166
 167
 168         /* Now work out output format and string type */
 169         outform = MBSTRING_ASC;
 170         if (mask & B_ASN1_PRINTABLESTRING)
 171                 str_type = V_ASN1_PRINTABLESTRING;
 172         else if (mask & B_ASN1_IA5STRING)
 173                 str_type = V_ASN1_IA5STRING;
 174         else if (mask & B_ASN1_T61STRING)
 175                 str_type = V_ASN1_T61STRING;
 176         else if (mask & B_ASN1_BMPSTRING) {
 177                 str_type = V_ASN1_BMPSTRING;
 178                 outform = MBSTRING_BMP;
 179         } else if (mask & B_ASN1_UNIVERSALSTRING) {
 180                 str_type = V_ASN1_UNIVERSALSTRING;
 181                 outform = MBSTRING_UNIV;
 182         } else {
 183                 str_type = V_ASN1_UTF8STRING;
 184                 outform = MBSTRING_UTF8;
 185         }
 186         if (!out)
 187                 return str_type;
 188         if (*out) {
 189                 free_out = 0;
 190                 dest = *out;
 191                 if (dest->data) {
 192                         dest->length = 0;
 193                         free(dest->data);
 194                         dest->data = NULL;
 195                 }
 196                 dest->type = str_type;
 197         } else {
 198                 free_out = 1;
 199                 dest = ASN1_STRING_type_new(str_type);
 200                 if (!dest) {
 201                         ASN1error(ERR_R_MALLOC_FAILURE);
 202                         return -1;
 203                 }
 204                 *out = dest;
 205         }
 206         /* If both the same type just copy across */
 207         if (inform == outform) {
 208                 if (!ASN1_STRING_set(dest, in, len)) {
 209                         ASN1error(ERR_R_MALLOC_FAILURE);
 210                         goto err;
 211                 }
 212                 return str_type;
 213         }
 214
 215         /* Work out how much space the destination will need */
 216         switch (outform) {
 217         case MBSTRING_ASC:
 218                 outlen = nchar;
 219                 cpyfunc = cpy_asc;
 220                 break;
 221
 222         case MBSTRING_BMP:
 223                 outlen = nchar << 1;
 224                 cpyfunc = cpy_bmp;
 225                 break;
 226
 227         case MBSTRING_UNIV:
 228                 outlen = nchar << 2;
 229                 cpyfunc = cpy_univ;
 230                 break;
 231
 232         case MBSTRING_UTF8:
 233                 outlen = 0;
 234                 if (traverse_string(in, len, inform, out_utf8, &outlen) < 0) {
 235                         ASN1error(ASN1_R_ILLEGAL_CHARACTERS);
 236                         goto err;
 237                 }
 238                 cpyfunc = cpy_utf8;
 239                 break;
 240         }
 241         if (!(p = malloc(outlen + 1))) {
 242                 ASN1error(ERR_R_MALLOC_FAILURE);
 243                 goto err;
 244         }
 245         dest->length = outlen;
 246         dest->data = p;
 247         p[outlen] = 0;
 248         traverse_string(in, len, inform, cpyfunc, &p);
 249         return str_type;
 250
 251 err:
 252         if (free_out) {
 253                 ASN1_STRING_free(dest);
 254                 *out = NULL;
 255         }
 256         return -1;
 257 }
 258
 259 /* This function traverses a string and passes the value of each character
 260  * to an optional function along with a void * argument.
 261  */
 262
 263 static int
 264 traverse_string(const unsigned char *p, int len, int inform,
 265     int (*rfunc)(unsigned long value, void *in), void *arg)
 266 {
 267         unsigned long value;
 268         int ret;
 269
 270         while (len) {
 271                 switch (inform) {
 272                 case MBSTRING_ASC:
 273                         value = *p++;
 274                         len--;
 275                         break;
 276                 case MBSTRING_BMP:
 277                         value = *p++ << 8;
 278                         value |= *p++;
 279                         /* BMP is explictly defined to not support surrogates */
 280                         if (UNICODE_IS_SURROGATE(value))
 281                                 return -1;
 282                         len -= 2;
 283                         break;
 284                 case MBSTRING_UNIV:
 285                         value = (unsigned long)*p++ << 24;
 286                         value |= *p++ << 16;
 287                         value |= *p++ << 8;
 288                         value |= *p++;
 289                         if (value > UNICODE_MAX || UNICODE_IS_SURROGATE(value))
 290                                 return -1;
 291                         len -= 4;
 292                         break;
 293                 default:
 294                         ret = UTF8_getc(p, len, &value);
 295                         if (ret < 0)
 296                                 return -1;
 297                         len -= ret;
 298                         p += ret;
 299                         break;
 300                 }
 301                 if (rfunc) {
 302                         ret = rfunc(value, arg);
 303                         if (ret <= 0)
 304                                 return ret;
 305                 }
 306         }
 307         return 1;
 308 }
 309
 310 /* Various utility functions for traverse_string */
 311
 312 /* Just count number of characters */
 313
 314 static int
 315 in_utf8(unsigned long value, void *arg)
 316 {
 317         int *nchar;
 318
 319         nchar = arg;
 320         (*nchar)++;
 321         return 1;
 322 }
 323
 324 /* Determine size of output as a UTF8 String */
 325
 326 static int
 327 out_utf8(unsigned long value, void *arg)
 328 {
 329         int *outlen;
 330         int ret;
 331
 332         outlen = arg;
 333         ret = UTF8_putc(NULL, -1, value);
 334         if (ret < 0)
 335                 return ret;
 336         *outlen += ret;
 337         return 1;
 338 }
 339
 340 /* Determine the "type" of a string: check each character against a
 341  * supplied "mask".
 342  */
 343
 344 static int
 345 type_str(unsigned long value, void *arg)
 346 {
 347         unsigned long types;
 348
 349         types = *((unsigned long *)arg);
 350         if ((types & B_ASN1_PRINTABLESTRING) && !is_printable(value))
 351                 types &= ~B_ASN1_PRINTABLESTRING;
 352         if ((types & B_ASN1_IA5STRING) && (value > 127))
 353                 types &= ~B_ASN1_IA5STRING;
 354         if ((types & B_ASN1_T61STRING) && (value > 0xff))
 355                 types &= ~B_ASN1_T61STRING;
 356         if ((types & B_ASN1_BMPSTRING) && (value > 0xffff))
 357                 types &= ~B_ASN1_BMPSTRING;
 358         if (!types)
 359                 return -1;
 360         *((unsigned long *)arg) = types;
 361         return 1;
 362 }
 363
 364 /* Copy one byte per character ASCII like strings */
 365
 366 static int
 367 cpy_asc(unsigned long value, void *arg)
 368 {
 369         unsigned char **p, *q;
 370
 371         p = arg;
 372         q = *p;
 373         *q = value;
 374         (*p)++;
 375         return 1;
 376 }
 377
 378 /* Copy two byte per character BMPStrings */
 379
 380 static int
 381 cpy_bmp(unsigned long value, void *arg)
 382 {
 383         unsigned char **p, *q;
 384
 385         p = arg;
 386         q = *p;
 387         *q++ = (value >> 8) & 0xff;
 388         *q = value & 0xff;
 389         *p += 2;
 390         return 1;
 391 }
 392
 393 /* Copy four byte per character UniversalStrings */
 394
 395 static int
 396 cpy_univ(unsigned long value, void *arg)
 397 {
 398         unsigned char **p, *q;
 399
 400         p = arg;
 401         q = *p;
 402         *q++ = (value >> 24) & 0xff;
 403         *q++ = (value >> 16) & 0xff;
 404         *q++ = (value >> 8) & 0xff;
 405         *q = value & 0xff;
 406         *p += 4;
 407         return 1;
 408 }
 409
 410 /* Copy to a UTF8String */
 411
 412 static int
 413 cpy_utf8(unsigned long value, void *arg)
 414 {
 415         unsigned char **p;
 416
 417         int ret;
 418         p = arg;
 419         /* We already know there is enough room so pass 0xff as the length */
 420         ret = UTF8_putc(*p, 0xff, value);
 421         *p += ret;
 422         return 1;
 423 }
 424
 425 /* Return 1 if the character is permitted in a PrintableString */
 426 static int
 427 is_printable(unsigned long value)
 428 {
 429         int ch;
 430
 431         if (value > 0x7f)
 432                 return 0;
 433         ch = (int)value;
 434
 435         /* Note: we can't use 'isalnum' because certain accented
 436          * characters may count as alphanumeric in some environments.
 437          */
 438         if ((ch >= 'a') && (ch <= 'z'))
 439                 return 1;
 440         if ((ch >= 'A') && (ch <= 'Z'))
 441                 return 1;
 442         if ((ch >= '0') && (ch <= '9'))
 443                 return 1;
 444         if ((ch == ' ') || strchr("'()+,-./:=?", ch))
 445                 return 1;
 446         return 0;
 447 }