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 "internal/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     dump_indent = 6;            /* Because we know BIO_dump_indent() */
 127     p = *pp;
 128     tot = p + length;
 129     op = p - 1;
 130     while ((p < tot) && (op < p)) {
 131         op = p;
 132         j = ASN1_get_object(&p, &len, &tag, &xclass, length);
 133         if (j & 0x80) {
 134             if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
 135                 goto end;
 136             ret = 0;
 137             goto end;
 138         }
 139         hl = (p - op);
 140         length -= hl;
 141         /*
 142          * if j == 0x21 it is a constructed indefinite length object
 143          */
 144         if (BIO_printf(bp, "%5ld:", (long)offset + (long)(op - *pp))
 145             <= 0)
 146             goto end;
 147
 148         if (j != (V_ASN1_CONSTRUCTED | 1)) {
 149             if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
 150                            depth, (long)hl, len) <= 0)
 151                 goto end;
 152         } else {
 153             if (BIO_printf(bp, "d=%-2d hl=%ld l=inf  ", depth, (long)hl) <= 0)
 154                 goto end;
 155         }
 156         if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
 157             goto end;
 158         if (j & V_ASN1_CONSTRUCTED) {
 159             ep = p + len;
 160             if (BIO_write(bp, "\n", 1) <= 0)
 161                 goto end;
 162             if (len > length) {
 163                 BIO_printf(bp, "length is greater than %ld\n", length);
 164                 ret = 0;
 165                 goto end;
 166             }
 167             if ((j == 0x21) && (len == 0)) {
 168                 for (;;) {
 169                     r = asn1_parse2(bp, &p, (long)(tot - p),
 170                                     offset + (p - *pp), depth + 1,
 171                                     indent, dump);
 172                     if (r == 0) {
 173                         ret = 0;
 174                         goto end;
 175                     }
 176                     if ((r == 2) || (p >= tot))
 177                         break;
 178                 }
 179             } else
 180                 while (p < ep) {
 181                     r = asn1_parse2(bp, &p, (long)len,
 182                                     offset + (p - *pp), depth + 1,
 183                                     indent, dump);
 184                     if (r == 0) {
 185                         ret = 0;
 186                         goto end;
 187                     }
 188                 }
 189         } else if (xclass != 0) {
 190             p += len;
 191             if (BIO_write(bp, "\n", 1) <= 0)
 192                 goto end;
 193         } else {
 194             nl = 0;
 195             if ((tag == V_ASN1_PRINTABLESTRING) ||
 196                 (tag == V_ASN1_T61STRING) ||
 197                 (tag == V_ASN1_IA5STRING) ||
 198                 (tag == V_ASN1_VISIBLESTRING) ||
 199                 (tag == V_ASN1_NUMERICSTRING) ||
 200                 (tag == V_ASN1_UTF8STRING) ||
 201                 (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
 202                 if (BIO_write(bp, ":", 1) <= 0)
 203                     goto end;
 204                 if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
 205                     != (int)len)
 206                     goto end;
 207             } else if (tag == V_ASN1_OBJECT) {
 208                 opp = op;
 209                 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
 210                     if (BIO_write(bp, ":", 1) <= 0)
 211                         goto end;
 212                     i2a_ASN1_OBJECT(bp, o);
 213                 } else {
 214                     if (BIO_write(bp, ":BAD OBJECT", 11) <= 0)
 215                         goto end;
 216                 }
 217             } else if (tag == V_ASN1_BOOLEAN) {
 218                 if (len != 1) {
 219                     if (BIO_write(bp, "Bad boolean\n", 12) <= 0)
 220                         goto end;
 221                 }
 222                 BIO_printf(bp, ":%u", p[0]);
 223             } else if (tag == V_ASN1_BMPSTRING) {
 224                 /* do the BMP thang */
 225             } else if (tag == V_ASN1_OCTET_STRING) {
 226                 int i, printable = 1;
 227
 228                 opp = op;
 229                 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
 230                 if (os != NULL && os->length > 0) {
 231                     opp = os->data;
 232                     /*
 233                      * testing whether the octet string is printable
 234                      */
 235                     for (i = 0; i < os->length; i++) {
 236                         if (((opp[i] < ' ') &&
 237                              (opp[i] != '\n') &&
 238                              (opp[i] != '\r') &&
 239                              (opp[i] != '\t')) || (opp[i] > '~')) {
 240                             printable = 0;
 241                             break;
 242                         }
 243                     }
 244                     if (printable)
 245                         /* printable string */
 246                     {
 247                         if (BIO_write(bp, ":", 1) <= 0)
 248                             goto end;
 249                         if (BIO_write(bp, (const char *)opp, os->length) <= 0)
 250                             goto end;
 251                     } else if (!dump)
 252                         /*
 253                          * not printable => print octet string as hex dump
 254                          */
 255                     {
 256                         if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
 257                             goto end;
 258                         for (i = 0; i < os->length; i++) {
 259                             if (BIO_printf(bp, "%02X", opp[i]) <= 0)
 260                                 goto end;
 261                         }
 262                     } else
 263                         /* print the normal dump */
 264                     {
 265                         if (!nl) {
 266                             if (BIO_write(bp, "\n", 1) <= 0)
 267                                 goto end;
 268                         }
 269                         if (BIO_dump_indent(bp,
 270                                             (const char *)opp,
 271                                             ((dump == -1 || dump >
 272                                               os->
 273                                               length) ? os->length : dump),
 274                                             dump_indent) <= 0)
 275                             goto end;
 276                         nl = 1;
 277                     }
 278                 }
 279                 ASN1_OCTET_STRING_free(os);
 280                 os = NULL;
 281             } else if (tag == V_ASN1_INTEGER) {
 282                 ASN1_INTEGER *bs;
 283                 int i;
 284
 285                 opp = op;
 286                 bs = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
 287                 if (bs != NULL) {
 288                     if (BIO_write(bp, ":", 1) <= 0)
 289                         goto end;
 290                     if (bs->type == V_ASN1_NEG_INTEGER)
 291                         if (BIO_write(bp, "-", 1) <= 0)
 292                             goto end;
 293                     for (i = 0; i < bs->length; i++) {
 294                         if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
 295                             goto end;
 296                     }
 297                     if (bs->length == 0) {
 298                         if (BIO_write(bp, "00", 2) <= 0)
 299                             goto end;
 300                     }
 301                 } else {
 302                     if (BIO_write(bp, "BAD INTEGER", 11) <= 0)
 303                         goto end;
 304                 }
 305                 ASN1_INTEGER_free(bs);
 306             } else if (tag == V_ASN1_ENUMERATED) {
 307                 ASN1_ENUMERATED *bs;
 308                 int i;
 309
 310                 opp = op;
 311                 bs = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
 312                 if (bs != NULL) {
 313                     if (BIO_write(bp, ":", 1) <= 0)
 314                         goto end;
 315                     if (bs->type == V_ASN1_NEG_ENUMERATED)
 316                         if (BIO_write(bp, "-", 1) <= 0)
 317                             goto end;
 318                     for (i = 0; i < bs->length; i++) {
 319                         if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
 320                             goto end;
 321                     }
 322                     if (bs->length == 0) {
 323                         if (BIO_write(bp, "00", 2) <= 0)
 324                             goto end;
 325                     }
 326                 } else {
 327                     if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0)
 328                         goto end;
 329                 }
 330                 ASN1_ENUMERATED_free(bs);
 331             } else if (len > 0 && dump) {
 332                 if (!nl) {
 333                     if (BIO_write(bp, "\n", 1) <= 0)
 334                         goto end;
 335                 }
 336                 if (BIO_dump_indent(bp, (const char *)p,
 337                                     ((dump == -1 || dump > len) ? len : dump),
 338                                     dump_indent) <= 0)
 339                     goto end;
 340                 nl = 1;
 341             }
 342
 343             if (!nl) {
 344                 if (BIO_write(bp, "\n", 1) <= 0)
 345                     goto end;
 346             }
 347             p += len;
 348             if ((tag == V_ASN1_EOC) && (xclass == 0)) {
 349                 ret = 2;        /* End of sequence */
 350                 goto end;
 351             }
 352         }
 353         length -= len;
 354     }
 355     ret = 1;
 356  end:
 357     ASN1_OBJECT_free(o);
 358     ASN1_OCTET_STRING_free(os);
 359     *pp = p;
 360     return (ret);
 361 }
 362
 363 const char *ASN1_tag2str(int tag)
 364 {
 365     static const char *const tag2str[] = {
 366         /* 0-4 */
 367         "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
 368         /* 5-9 */
 369         "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
 370         /* 10-13 */
 371         "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
 372         /* 15-17 */
 373         "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
 374         /* 18-20 */
 375         "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
 376         /* 21-24 */
 377         "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
 378         /* 25-27 */
 379         "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
 380         /* 28-30 */
 381         "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
 382     };
 383
 384     if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
 385         tag &= ~0x100;
 386
 387     if (tag < 0 || tag > 30)
 388         return "(unknown)";
 389     return tag2str[tag];
 390 }