crypto/asn1/asn1_par.c

   1 /* crypto/asn1/asn1_par.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/buffer.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/asn1.h>
  64
  65 static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
  66                            int indent);
  67 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
  68                        int offset, int depth, int indent, int dump);
  69 static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
  70                            int indent)
  71 {
  72     static const char fmt[] = "%-18s";
  73     char str[128];
  74     const char *p;
  75
  76     if (constructed & V_ASN1_CONSTRUCTED)
  77         p = "cons: ";
  78     else
  79         p = "prim: ";
  80     if (BIO_write(bp, p, 6) < 6)
  81         goto err;
  82     BIO_indent(bp, indent, 128);
  83
  84     p = str;
  85     if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
  86         BIO_snprintf(str, sizeof str, "priv [ %d ] ", tag);
  87     else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
  88         BIO_snprintf(str, sizeof str, "cont [ %d ]", tag);
  89     else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
  90         BIO_snprintf(str, sizeof str, "appl [ %d ]", tag);
  91     else if (tag > 30)
  92         BIO_snprintf(str, sizeof str, "<ASN1 %d>", tag);
  93     else
  94         p = ASN1_tag2str(tag);
  95
  96     if (BIO_printf(bp, fmt, p) <= 0)
  97         goto err;
  98     return (1);
  99  err:
 100     return (0);
 101 }
 102
 103 int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
 104 {
 105     return (asn1_parse2(bp, &pp, len, 0, 0, indent, 0));
 106 }
 107
 108 int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent,
 109                     int dump)
 110 {
 111     return (asn1_parse2(bp, &pp, len, 0, 0, indent, dump));
 112 }
 113
 114 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
 115                        int offset, int depth, int indent, int dump)
 116 {
 117     const unsigned char *p, *ep, *tot, *op, *opp;
 118     long len;
 119     int tag, xclass, ret = 0;
 120     int nl, hl, j, r;
 121     ASN1_OBJECT *o = NULL;
 122     ASN1_OCTET_STRING *os = NULL;
 123     /* ASN1_BMPSTRING *bmp=NULL; */
 124     int dump_indent;
 125
 126 #if 0
 127     dump_indent = indent;
 128 #else
 129     dump_indent = 6;            /* Because we know BIO_dump_indent() */
 130 #endif
 131     p = *pp;
 132     tot = p + length;
 133     op = p - 1;
 134     while ((p < tot) && (op < p)) {
 135         op = p;
 136         j = ASN1_get_object(&p, &len, &tag, &xclass, length);
 137 #ifdef LINT
 138         j = j;
 139 #endif
 140         if (j & 0x80) {
 141             if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
 142                 goto end;
 143             ret = 0;
 144             goto end;
 145         }
 146         hl = (p - op);
 147         length -= hl;
 148         /*
 149          * if j == 0x21 it is a constructed indefinite length object
 150          */
 151         if (BIO_printf(bp, "%5ld:", (long)offset + (long)(op - *pp))
 152             <= 0)
 153             goto end;
 154
 155         if (j != (V_ASN1_CONSTRUCTED | 1)) {
 156             if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
 157                            depth, (long)hl, len) <= 0)
 158                 goto end;
 159         } else {
 160             if (BIO_printf(bp, "d=%-2d hl=%ld l=inf  ", depth, (long)hl) <= 0)
 161                 goto end;
 162         }
 163         if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
 164             goto end;
 165         if (j & V_ASN1_CONSTRUCTED) {
 166             ep = p + len;
 167             if (BIO_write(bp, "\n", 1) <= 0)
 168                 goto end;
 169             if (len > length) {
 170                 BIO_printf(bp, "length is greater than %ld\n", length);
 171                 ret = 0;
 172                 goto end;
 173             }
 174             if ((j == 0x21) && (len == 0)) {
 175                 for (;;) {
 176                     r = asn1_parse2(bp, &p, (long)(tot - p),
 177                                     offset + (p - *pp), depth + 1,
 178                                     indent, dump);
 179                     if (r == 0) {
 180                         ret = 0;
 181                         goto end;
 182                     }
 183                     if ((r == 2) || (p >= tot))
 184                         break;
 185                 }
 186             } else
 187                 while (p < ep) {
 188                     r = asn1_parse2(bp, &p, (long)len,
 189                                     offset + (p - *pp), depth + 1,
 190                                     indent, dump);
 191                     if (r == 0) {
 192                         ret = 0;
 193                         goto end;
 194                     }
 195                 }
 196         } else if (xclass != 0) {
 197             p += len;
 198             if (BIO_write(bp, "\n", 1) <= 0)
 199                 goto end;
 200         } else {
 201             nl = 0;
 202             if ((tag == V_ASN1_PRINTABLESTRING) ||
 203                 (tag == V_ASN1_T61STRING) ||
 204                 (tag == V_ASN1_IA5STRING) ||
 205                 (tag == V_ASN1_VISIBLESTRING) ||
 206                 (tag == V_ASN1_NUMERICSTRING) ||
 207                 (tag == V_ASN1_UTF8STRING) ||
 208                 (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
 209                 if (BIO_write(bp, ":", 1) <= 0)
 210                     goto end;
 211                 if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
 212                     != (int)len)
 213                     goto end;
 214             } else if (tag == V_ASN1_OBJECT) {
 215                 opp = op;
 216                 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
 217                     if (BIO_write(bp, ":", 1) <= 0)
 218                         goto end;
 219                     i2a_ASN1_OBJECT(bp, o);
 220                 } else {
 221                     if (BIO_write(bp, ":BAD OBJECT", 11) <= 0)
 222                         goto end;
 223                 }
 224             } else if (tag == V_ASN1_BOOLEAN) {
 225                 int ii;
 226
 227                 opp = op;
 228                 ii = d2i_ASN1_BOOLEAN(NULL, &opp, len + hl);
 229                 if (ii < 0) {
 230                     if (BIO_write(bp, "Bad boolean\n", 12) <= 0)
 231                         goto end;
 232                 }
 233                 BIO_printf(bp, ":%d", ii);
 234             } else if (tag == V_ASN1_BMPSTRING) {
 235                 /* do the BMP thang */
 236             } else if (tag == V_ASN1_OCTET_STRING) {
 237                 int i, printable = 1;
 238
 239                 opp = op;
 240                 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
 241                 if (os != NULL && os->length > 0) {
 242                     opp = os->data;
 243                     /*
 244                      * testing whether the octet string is printable
 245                      */
 246                     for (i = 0; i < os->length; i++) {
 247                         if (((opp[i] < ' ') &&
 248                              (opp[i] != '\n') &&
 249                              (opp[i] != '\r') &&
 250                              (opp[i] != '\t')) || (opp[i] > '~')) {
 251                             printable = 0;
 252                             break;
 253                         }
 254                     }
 255                     if (printable)
 256                         /* printable string */
 257                     {
 258                         if (BIO_write(bp, ":", 1) <= 0)
 259                             goto end;
 260                         if (BIO_write(bp, (const char *)opp, os->length) <= 0)
 261                             goto end;
 262                     } else if (!dump)
 263                         /*
 264                          * not printable => print octet string as hex dump
 265                          */
 266                     {
 267                         if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
 268                             goto end;
 269                         for (i = 0; i < os->length; i++) {
 270                             if (BIO_printf(bp, "%02X", opp[i]) <= 0)
 271                                 goto end;
 272                         }
 273                     } else
 274                         /* print the normal dump */
 275                     {
 276                         if (!nl) {
 277                             if (BIO_write(bp, "\n", 1) <= 0)
 278                                 goto end;
 279                         }
 280                         if (BIO_dump_indent(bp,
 281                                             (const char *)opp,
 282                                             ((dump == -1 || dump >
 283                                               os->
 284                                               length) ? os->length : dump),
 285                                             dump_indent) <= 0)
 286                             goto end;
 287                         nl = 1;
 288                     }
 289                 }
 290                 if (os != NULL) {
 291                     M_ASN1_OCTET_STRING_free(os);
 292                     os = NULL;
 293                 }
 294             } else if (tag == V_ASN1_INTEGER) {
 295                 ASN1_INTEGER *bs;
 296                 int i;
 297
 298                 opp = op;
 299                 bs = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
 300                 if (bs != NULL) {
 301                     if (BIO_write(bp, ":", 1) <= 0)
 302                         goto end;
 303                     if (bs->type == V_ASN1_NEG_INTEGER)
 304                         if (BIO_write(bp, "-", 1) <= 0)
 305                             goto end;
 306                     for (i = 0; i < bs->length; i++) {
 307                         if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
 308                             goto end;
 309                     }
 310                     if (bs->length == 0) {
 311                         if (BIO_write(bp, "00", 2) <= 0)
 312                             goto end;
 313                     }
 314                 } else {
 315                     if (BIO_write(bp, "BAD INTEGER", 11) <= 0)
 316                         goto end;
 317                 }
 318                 M_ASN1_INTEGER_free(bs);
 319             } else if (tag == V_ASN1_ENUMERATED) {
 320                 ASN1_ENUMERATED *bs;
 321                 int i;
 322
 323                 opp = op;
 324                 bs = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
 325                 if (bs != NULL) {
 326                     if (BIO_write(bp, ":", 1) <= 0)
 327                         goto end;
 328                     if (bs->type == V_ASN1_NEG_ENUMERATED)
 329                         if (BIO_write(bp, "-", 1) <= 0)
 330                             goto end;
 331                     for (i = 0; i < bs->length; i++) {
 332                         if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
 333                             goto end;
 334                     }
 335                     if (bs->length == 0) {
 336                         if (BIO_write(bp, "00", 2) <= 0)
 337                             goto end;
 338                     }
 339                 } else {
 340                     if (BIO_write(bp, "BAD ENUMERATED", 11) <= 0)
 341                         goto end;
 342                 }
 343                 M_ASN1_ENUMERATED_free(bs);
 344             } else if (len > 0 && dump) {
 345                 if (!nl) {
 346                     if (BIO_write(bp, "\n", 1) <= 0)
 347                         goto end;
 348                 }
 349                 if (BIO_dump_indent(bp, (const char *)p,
 350                                     ((dump == -1 || dump > len) ? len : dump),
 351                                     dump_indent) <= 0)
 352                     goto end;
 353                 nl = 1;
 354             }
 355
 356             if (!nl) {
 357                 if (BIO_write(bp, "\n", 1) <= 0)
 358                     goto end;
 359             }
 360             p += len;
 361             if ((tag == V_ASN1_EOC) && (xclass == 0)) {
 362                 ret = 2;        /* End of sequence */
 363                 goto end;
 364             }
 365         }
 366         length -= len;
 367     }
 368     ret = 1;
 369  end:
 370     if (o != NULL)
 371         ASN1_OBJECT_free(o);
 372     if (os != NULL)
 373         M_ASN1_OCTET_STRING_free(os);
 374     *pp = p;
 375     return (ret);
 376 }
 377
 378 const char *ASN1_tag2str(int tag)
 379 {
 380     static const char *const tag2str[] = {
 381         /* 0-4 */
 382         "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
 383         /* 5-9 */
 384         "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
 385         /* 10-13 */
 386         "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
 387         /* 15-17 */
 388         "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
 389         /* 18-20 */
 390         "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
 391         /* 21-24 */
 392         "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
 393         /* 25-27 */
 394         "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
 395         /* 28-30 */
 396         "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
 397     };
 398
 399     if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
 400         tag &= ~0x100;
 401
 402     if (tag < 0 || tag > 30)
 403         return "(unknown)";
 404     return tag2str[tag];
 405 }