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     static const char fmt2[] = "%2d %-15s";
  74     char str[128];
  75     const char *p, *p2 = NULL;
  76
  77     if (constructed & V_ASN1_CONSTRUCTED)
  78         p = "cons: ";
  79     else
  80         p = "prim: ";
  81     if (BIO_write(bp, p, 6) < 6)
  82         goto err;
  83     BIO_indent(bp, indent, 128);
  84
  85     p = str;
  86     if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
  87         BIO_snprintf(str, sizeof str, "priv [ %d ] ", tag);
  88     else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
  89         BIO_snprintf(str, sizeof str, "cont [ %d ]", tag);
  90     else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
  91         BIO_snprintf(str, sizeof str, "appl [ %d ]", tag);
  92     else if (tag > 30)
  93         BIO_snprintf(str, sizeof str, "<ASN1 %d>", tag);
  94     else
  95         p = ASN1_tag2str(tag);
  96
  97     if (p2 != NULL) {
  98         if (BIO_printf(bp, fmt2, tag, p2) <= 0)
  99             goto err;
 100     } else {
 101         if (BIO_printf(bp, fmt, p) <= 0)
 102             goto err;
 103     }
 104     return (1);
 105  err:
 106     return (0);
 107 }
 108
 109 int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
 110 {
 111     return (asn1_parse2(bp, &pp, len, 0, 0, indent, 0));
 112 }
 113
 114 int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent,
 115                     int dump)
 116 {
 117     return (asn1_parse2(bp, &pp, len, 0, 0, indent, dump));
 118 }
 119
 120 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
 121                        int offset, int depth, int indent, int dump)
 122 {
 123     const unsigned char *p, *ep, *tot, *op, *opp;
 124     long len;
 125     int tag, xclass, ret = 0;
 126     int nl, hl, j, r;
 127     ASN1_OBJECT *o = NULL;
 128     ASN1_OCTET_STRING *os = NULL;
 129     /* ASN1_BMPSTRING *bmp=NULL; */
 130     int dump_indent;
 131
 132 #if 0
 133     dump_indent = indent;
 134 #else
 135     dump_indent = 6;            /* Because we know BIO_dump_indent() */
 136 #endif
 137     p = *pp;
 138     tot = p + length;
 139     op = p - 1;
 140     while ((p < tot) && (op < p)) {
 141         op = p;
 142         j = ASN1_get_object(&p, &len, &tag, &xclass, length);
 143 #ifdef LINT
 144         j = j;
 145 #endif
 146         if (j & 0x80) {
 147             if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
 148                 goto end;
 149             ret = 0;
 150             goto end;
 151         }
 152         hl = (p - op);
 153         length -= hl;
 154         /*
 155          * if j == 0x21 it is a constructed indefinite length object
 156          */
 157         if (BIO_printf(bp, "%5ld:", (long)offset + (long)(op - *pp))
 158             <= 0)
 159             goto end;
 160
 161         if (j != (V_ASN1_CONSTRUCTED | 1)) {
 162             if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
 163                            depth, (long)hl, len) <= 0)
 164                 goto end;
 165         } else {
 166             if (BIO_printf(bp, "d=%-2d hl=%ld l=inf  ", depth, (long)hl) <= 0)
 167                 goto end;
 168         }
 169         if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
 170             goto end;
 171         if (j & V_ASN1_CONSTRUCTED) {
 172             ep = p + len;
 173             if (BIO_write(bp, "\n", 1) <= 0)
 174                 goto end;
 175             if (len > length) {
 176                 BIO_printf(bp, "length is greater than %ld\n", length);
 177                 ret = 0;
 178                 goto end;
 179             }
 180             if ((j == 0x21) && (len == 0)) {
 181                 for (;;) {
 182                     r = asn1_parse2(bp, &p, (long)(tot - p),
 183                                     offset + (p - *pp), depth + 1,
 184                                     indent, dump);
 185                     if (r == 0) {
 186                         ret = 0;
 187                         goto end;
 188                     }
 189                     if ((r == 2) || (p >= tot))
 190                         break;
 191                 }
 192             } else
 193                 while (p < ep) {
 194                     r = asn1_parse2(bp, &p, (long)len,
 195                                     offset + (p - *pp), depth + 1,
 196                                     indent, dump);
 197                     if (r == 0) {
 198                         ret = 0;
 199                         goto end;
 200                     }
 201                 }
 202         } else if (xclass != 0) {
 203             p += len;
 204             if (BIO_write(bp, "\n", 1) <= 0)
 205                 goto end;
 206         } else {
 207             nl = 0;
 208             if ((tag == V_ASN1_PRINTABLESTRING) ||
 209                 (tag == V_ASN1_T61STRING) ||
 210                 (tag == V_ASN1_IA5STRING) ||
 211                 (tag == V_ASN1_VISIBLESTRING) ||
 212                 (tag == V_ASN1_NUMERICSTRING) ||
 213                 (tag == V_ASN1_UTF8STRING) ||
 214                 (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
 215                 if (BIO_write(bp, ":", 1) <= 0)
 216                     goto end;
 217                 if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
 218                     != (int)len)
 219                     goto end;
 220             } else if (tag == V_ASN1_OBJECT) {
 221                 opp = op;
 222                 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
 223                     if (BIO_write(bp, ":", 1) <= 0)
 224                         goto end;
 225                     i2a_ASN1_OBJECT(bp, o);
 226                 } else {
 227                     if (BIO_write(bp, ":BAD OBJECT", 11) <= 0)
 228                         goto end;
 229                 }
 230             } else if (tag == V_ASN1_BOOLEAN) {
 231                 int ii;
 232
 233                 opp = op;
 234                 ii = d2i_ASN1_BOOLEAN(NULL, &opp, len + hl);
 235                 if (ii < 0) {
 236                     if (BIO_write(bp, "Bad boolean\n", 12) <= 0)
 237                         goto end;
 238                 }
 239                 BIO_printf(bp, ":%d", ii);
 240             } else if (tag == V_ASN1_BMPSTRING) {
 241                 /* do the BMP thang */
 242             } else if (tag == V_ASN1_OCTET_STRING) {
 243                 int i, printable = 1;
 244
 245                 opp = op;
 246                 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
 247                 if (os != NULL && os->length > 0) {
 248                     opp = os->data;
 249                     /*
 250                      * testing whether the octet string is printable
 251                      */
 252                     for (i = 0; i < os->length; i++) {
 253                         if (((opp[i] < ' ') &&
 254                              (opp[i] != '\n') &&
 255                              (opp[i] != '\r') &&
 256                              (opp[i] != '\t')) || (opp[i] > '~')) {
 257                             printable = 0;
 258                             break;
 259                         }
 260                     }
 261                     if (printable)
 262                         /* printable string */
 263                     {
 264                         if (BIO_write(bp, ":", 1) <= 0)
 265                             goto end;
 266                         if (BIO_write(bp, (const char *)opp, os->length) <= 0)
 267                             goto end;
 268                     } else if (!dump)
 269                         /*
 270                          * not printable => print octet string as hex dump
 271                          */
 272                     {
 273                         if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
 274                             goto end;
 275                         for (i = 0; i < os->length; i++) {
 276                             if (BIO_printf(bp, "%02X", opp[i]) <= 0)
 277                                 goto end;
 278                         }
 279                     } else
 280                         /* print the normal dump */
 281                     {
 282                         if (!nl) {
 283                             if (BIO_write(bp, "\n", 1) <= 0)
 284                                 goto end;
 285                         }
 286                         if (BIO_dump_indent(bp,
 287                                             (const char *)opp,
 288                                             ((dump == -1 || dump >
 289                                               os->
 290                                               length) ? os->length : dump),
 291                                             dump_indent) <= 0)
 292                             goto end;
 293                         nl = 1;
 294                     }
 295                 }
 296                 if (os != NULL) {
 297                     M_ASN1_OCTET_STRING_free(os);
 298                     os = NULL;
 299                 }
 300             } else if (tag == V_ASN1_INTEGER) {
 301                 ASN1_INTEGER *bs;
 302                 int i;
 303
 304                 opp = op;
 305                 bs = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
 306                 if (bs != NULL) {
 307                     if (BIO_write(bp, ":", 1) <= 0)
 308                         goto end;
 309                     if (bs->type == V_ASN1_NEG_INTEGER)
 310                         if (BIO_write(bp, "-", 1) <= 0)
 311                             goto end;
 312                     for (i = 0; i < bs->length; i++) {
 313                         if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
 314                             goto end;
 315                     }
 316                     if (bs->length == 0) {
 317                         if (BIO_write(bp, "00", 2) <= 0)
 318                             goto end;
 319                     }
 320                 } else {
 321                     if (BIO_write(bp, "BAD INTEGER", 11) <= 0)
 322                         goto end;
 323                 }
 324                 M_ASN1_INTEGER_free(bs);
 325             } else if (tag == V_ASN1_ENUMERATED) {
 326                 ASN1_ENUMERATED *bs;
 327                 int i;
 328
 329                 opp = op;
 330                 bs = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
 331                 if (bs != NULL) {
 332                     if (BIO_write(bp, ":", 1) <= 0)
 333                         goto end;
 334                     if (bs->type == V_ASN1_NEG_ENUMERATED)
 335                         if (BIO_write(bp, "-", 1) <= 0)
 336                             goto end;
 337                     for (i = 0; i < bs->length; i++) {
 338                         if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
 339                             goto end;
 340                     }
 341                     if (bs->length == 0) {
 342                         if (BIO_write(bp, "00", 2) <= 0)
 343                             goto end;
 344                     }
 345                 } else {
 346                     if (BIO_write(bp, "BAD ENUMERATED", 11) <= 0)
 347                         goto end;
 348                 }
 349                 M_ASN1_ENUMERATED_free(bs);
 350             } else if (len > 0 && dump) {
 351                 if (!nl) {
 352                     if (BIO_write(bp, "\n", 1) <= 0)
 353                         goto end;
 354                 }
 355                 if (BIO_dump_indent(bp, (const char *)p,
 356                                     ((dump == -1 || dump > len) ? len : dump),
 357                                     dump_indent) <= 0)
 358                     goto end;
 359                 nl = 1;
 360             }
 361
 362             if (!nl) {
 363                 if (BIO_write(bp, "\n", 1) <= 0)
 364                     goto end;
 365             }
 366             p += len;
 367             if ((tag == V_ASN1_EOC) && (xclass == 0)) {
 368                 ret = 2;        /* End of sequence */
 369                 goto end;
 370             }
 371         }
 372         length -= len;
 373     }
 374     ret = 1;
 375  end:
 376     if (o != NULL)
 377         ASN1_OBJECT_free(o);
 378     if (os != NULL)
 379         M_ASN1_OCTET_STRING_free(os);
 380     *pp = p;
 381     return (ret);
 382 }
 383
 384 const char *ASN1_tag2str(int tag)
 385 {
 386     static const char *tag2str[] = {
 387         /* 0-4 */
 388         "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
 389         /* 5-9 */
 390         "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
 391         /* 10-13 */
 392         "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
 393         /* 15-17 */
 394         "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
 395         /* 18-20 */
 396         "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
 397         /* 21-24 */
 398         "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
 399         /* 25-27 */
 400         "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
 401         /* 28-30 */
 402         "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
 403     };
 404
 405     if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
 406         tag &= ~0x100;
 407
 408     if (tag < 0 || tag > 30)
 409         return "(unknown)";
 410     return tag2str[tag];
 411 }