crypto/dist/heimdal/lib/asn1/gen_encode.c

   1 /*
   2  * Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "gen_locl.h"
  35
  36 __RCSID("$Heimdal: gen_encode.c 22429 2008-01-13 10:25:50Z lha $"
  37         "$NetBSD$");
  38
  39 static void
  40 encode_primitive (const char *typename, const char *name)
  41 {
  42     fprintf (codefile,
  43              "e = der_put_%s(p, len, %s, &l);\n"
  44              "if (e) return e;\np -= l; len -= l; ret += l;\n\n",
  45              typename,
  46              name);
  47 }
  48
  49 const char *
  50 classname(Der_class class)
  51 {
  52     const char *cn[] = { "ASN1_C_UNIV", "ASN1_C_APPL",
  53                          "ASN1_C_CONTEXT", "ASN1_C_PRIV" };
  54     if(class < ASN1_C_UNIV || class > ASN1_C_PRIVATE)
  55         return "???";
  56     return cn[class];
  57 }
  58
  59
  60 const char *
  61 valuename(Der_class class, int value)
  62 {
  63     static char s[32];
  64     struct {
  65         int value;
  66         const char *s;
  67     } *p, values[] = {
  68 #define X(Y) { Y, #Y }
  69         X(UT_BMPString),
  70         X(UT_BitString),
  71         X(UT_Boolean),
  72         X(UT_EmbeddedPDV),
  73         X(UT_Enumerated),
  74         X(UT_External),
  75         X(UT_GeneralString),
  76         X(UT_GeneralizedTime),
  77         X(UT_GraphicString),
  78         X(UT_IA5String),
  79         X(UT_Integer),
  80         X(UT_Null),
  81         X(UT_NumericString),
  82         X(UT_OID),
  83         X(UT_ObjectDescriptor),
  84         X(UT_OctetString),
  85         X(UT_PrintableString),
  86         X(UT_Real),
  87         X(UT_RelativeOID),
  88         X(UT_Sequence),
  89         X(UT_Set),
  90         X(UT_TeletexString),
  91         X(UT_UTCTime),
  92         X(UT_UTF8String),
  93         X(UT_UniversalString),
  94         X(UT_VideotexString),
  95         X(UT_VisibleString),
  96 #undef X
  97         { -1, NULL }
  98     };
  99     if(class == ASN1_C_UNIV) {
 100         for(p = values; p->value != -1; p++)
 101             if(p->value == value)
 102                 return p->s;
 103     }
 104     snprintf(s, sizeof(s), "%d", value);
 105     return s;
 106 }
 107
 108 static int
 109 encode_type (const char *name, const Type *t, const char *tmpstr)
 110 {
 111     int constructed = 1;
 112
 113     switch (t->type) {
 114     case TType:
 115 #if 0
 116         encode_type (name, t->symbol->type);
 117 #endif
 118         fprintf (codefile,
 119                  "e = encode_%s(p, len, %s, &l);\n"
 120                  "if (e) return e;\np -= l; len -= l; ret += l;\n\n",
 121                  t->symbol->gen_name, name);
 122         break;
 123     case TInteger:
 124         if(t->members) {
 125             fprintf(codefile,
 126                     "{\n"
 127                     "int enumint = (int)*%s;\n",
 128                     name);
 129             encode_primitive ("integer", "&enumint");
 130             fprintf(codefile, "}\n;");
 131         } else if (t->range == NULL) {
 132             encode_primitive ("heim_integer", name);
 133         } else if (t->range->min == INT_MIN && t->range->max == INT_MAX) {
 134             encode_primitive ("integer", name);
 135         } else if (t->range->min == 0 && t->range->max == UINT_MAX) {
 136             encode_primitive ("unsigned", name);
 137         } else if (t->range->min == 0 && t->range->max == INT_MAX) {
 138             encode_primitive ("unsigned", name);
 139         } else
 140             errx(1, "%s: unsupported range %d -> %d",
 141                  name, t->range->min, t->range->max);
 142         constructed = 0;
 143         break;
 144     case TBoolean:
 145         encode_primitive ("boolean", name);
 146         constructed = 0;
 147         break;
 148     case TOctetString:
 149         encode_primitive ("octet_string", name);
 150         constructed = 0;
 151         break;
 152     case TBitString: {
 153         Member *m;
 154         int pos;
 155
 156         if (ASN1_TAILQ_EMPTY(t->members)) {
 157             encode_primitive("bit_string", name);
 158             constructed = 0;
 159             break;
 160         }
 161
 162         fprintf (codefile, "{\n"
 163                  "unsigned char c = 0;\n");
 164         if (!rfc1510_bitstring)
 165             fprintf (codefile,
 166                      "int rest = 0;\n"
 167                      "int bit_set = 0;\n");
 168 #if 0
 169         pos = t->members->prev->val;
 170         /* fix for buggy MIT (and OSF?) code */
 171         if (pos > 31)
 172             abort ();
 173 #endif
 174         /*
 175          * It seems that if we do not always set pos to 31 here, the MIT
 176          * code will do the wrong thing.
 177          *
 178          * I hate ASN.1 (and DER), but I hate it even more when everybody
 179          * has to screw it up differently.
 180          */
 181         pos = ASN1_TAILQ_LAST(t->members, memhead)->val;
 182         if (rfc1510_bitstring) {
 183             if (pos < 31)
 184                 pos = 31;
 185         }
 186
 187         ASN1_TAILQ_FOREACH_REVERSE(m, t->members, memhead, members) {
 188             while (m->val / 8 < pos / 8) {
 189                 if (!rfc1510_bitstring)
 190                     fprintf (codefile,
 191                              "if (c != 0 || bit_set) {\n");
 192                 fprintf (codefile,
 193                          "if (len < 1) return ASN1_OVERFLOW;\n"
 194                          "*p-- = c; len--; ret++;\n");
 195                 if (!rfc1510_bitstring)
 196                     fprintf (codefile,
 197                              "if (!bit_set) {\n"
 198                              "rest = 0;\n"
 199                              "while(c) { \n"
 200                              "if (c & 1) break;\n"
 201                              "c = c >> 1;\n"
 202                              "rest++;\n"
 203                              "}\n"
 204                              "bit_set = 1;\n"
 205                              "}\n"
 206                              "}\n");
 207                 fprintf (codefile,
 208                          "c = 0;\n");
 209                 pos -= 8;
 210             }
 211             fprintf (codefile,
 212                      "if((%s)->%s) {\n"
 213                      "c |= 1<<%d;\n",
 214                      name, m->gen_name, 7 - m->val % 8);
 215             fprintf (codefile,
 216                      "}\n");
 217         }
 218
 219         if (!rfc1510_bitstring)
 220             fprintf (codefile,
 221                      "if (c != 0 || bit_set) {\n");
 222         fprintf (codefile,
 223                  "if (len < 1) return ASN1_OVERFLOW;\n"
 224                  "*p-- = c; len--; ret++;\n");
 225         if (!rfc1510_bitstring)
 226             fprintf (codefile,
 227                      "if (!bit_set) {\n"
 228                      "rest = 0;\n"
 229                      "if(c) { \n"
 230                      "while(c) { \n"
 231                      "if (c & 1) break;\n"
 232                      "c = c >> 1;\n"
 233                      "rest++;\n"
 234                      "}\n"
 235                      "}\n"
 236                      "}\n"
 237                      "}\n");
 238
 239         fprintf (codefile,
 240                  "if (len < 1) return ASN1_OVERFLOW;\n"
 241                  "*p-- = %s;\n"
 242                  "len -= 1;\n"
 243                  "ret += 1;\n"
 244                  "}\n\n",
 245                  rfc1510_bitstring ? "0" : "rest");
 246         constructed = 0;
 247         break;
 248     }
 249     case TEnumerated : {
 250         encode_primitive ("enumerated", name);
 251         constructed = 0;
 252         break;
 253     }
 254
 255     case TSet:
 256     case TSequence: {
 257         Member *m;
 258
 259         if (t->members == NULL)
 260             break;
 261
 262         ASN1_TAILQ_FOREACH_REVERSE(m, t->members, memhead, members) {
 263             char *s;
 264
 265             if (m->ellipsis)
 266                 continue;
 267
 268             asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&", name, m->gen_name);
 269             if (s == NULL)
 270                 errx(1, "malloc");
 271             fprintf(codefile, "/* %s */\n", m->name);
 272             if (m->optional)
 273                 fprintf (codefile,
 274                          "if(%s) ",
 275                          s);
 276             else if(m->defval)
 277                 gen_compare_defval(s + 1, m->defval);
 278             fprintf (codefile, "{\n");
 279             fprintf (codefile, "size_t %s_oldret = ret;\n", tmpstr);
 280             fprintf (codefile, "ret = 0;\n");
 281             encode_type (s, m->type, m->gen_name);
 282             fprintf (codefile, "ret += %s_oldret;\n", tmpstr);
 283             fprintf (codefile, "}\n");
 284             free (s);
 285         }
 286         break;
 287     }
 288     case TSetOf: {
 289
 290         fprintf(codefile,
 291                 "{\n"
 292                 "struct heim_octet_string *val;\n"
 293                 "size_t elen, totallen = 0;\n"
 294                 "int eret;\n");
 295
 296         fprintf(codefile,
 297                 "if ((%s)->len > UINT_MAX/sizeof(val[0]))\n"
 298                 "return ERANGE;\n",
 299                 name);
 300
 301         fprintf(codefile,
 302                 "val = malloc(sizeof(val[0]) * (%s)->len);\n"
 303                 "if (val == NULL && (%s)->len != 0) return ENOMEM;\n",
 304                 name, name);
 305
 306         fprintf(codefile,
 307                 "for(i = 0; i < (%s)->len; i++) {\n",
 308                 name);
 309
 310         fprintf(codefile,
 311                 "ASN1_MALLOC_ENCODE(%s, val[i].data, "
 312                 "val[i].length, &(%s)->val[i], &elen, eret);\n",
 313                 t->subtype->symbol->gen_name,
 314                 name);
 315
 316         fprintf(codefile,
 317                 "if(eret) {\n"
 318                 "i--;\n"
 319                 "while (i >= 0) {\n"
 320                 "free(val[i].data);\n"
 321                 "i--;\n"
 322                 "}\n"
 323                 "free(val);\n"
 324                 "return eret;\n"
 325                 "}\n"
 326                 "totallen += elen;\n"
 327                 "}\n");
 328
 329         fprintf(codefile,
 330                 "if (totallen > len) {\n"
 331                 "for (i = 0; i < (%s)->len; i++) {\n"
 332                 "free(val[i].data);\n"
 333                 "}\n"
 334                 "free(val);\n"
 335                 "return ASN1_OVERFLOW;\n"
 336                 "}\n",
 337                 name);
 338
 339         fprintf(codefile,
 340                 "qsort(val, (%s)->len, sizeof(val[0]), _heim_der_set_sort);\n",
 341                 name);
 342
 343         fprintf (codefile,
 344                  "for(i = (%s)->len - 1; i >= 0; --i) {\n"
 345                  "p -= val[i].length;\n"
 346                  "ret += val[i].length;\n"
 347                  "memcpy(p + 1, val[i].data, val[i].length);\n"
 348                  "free(val[i].data);\n"
 349                  "}\n"
 350                  "free(val);\n"
 351                  "}\n",
 352                  name);
 353         break;
 354     }
 355     case TSequenceOf: {
 356         char *n;
 357         char *sname;
 358
 359         fprintf (codefile,
 360                  "for(i = (%s)->len - 1; i >= 0; --i) {\n"
 361                  "size_t %s_for_oldret = ret;\n"
 362                  "ret = 0;\n",
 363                  name, tmpstr);
 364         asprintf (&n, "&(%s)->val[i]", name);
 365         if (n == NULL)
 366             errx(1, "malloc");
 367         asprintf (&sname, "%s_S_Of", tmpstr);
 368         if (sname == NULL)
 369             errx(1, "malloc");
 370         encode_type (n, t->subtype, sname);
 371         fprintf (codefile,
 372                  "ret += %s_for_oldret;\n"
 373                  "}\n",
 374                  tmpstr);
 375         free (n);
 376         free (sname);
 377         break;
 378     }
 379     case TGeneralizedTime:
 380         encode_primitive ("generalized_time", name);
 381         constructed = 0;
 382         break;
 383     case TGeneralString:
 384         encode_primitive ("general_string", name);
 385         constructed = 0;
 386         break;
 387     case TTag: {
 388         char *tname;
 389         int c;
 390         asprintf (&tname, "%s_tag", tmpstr);
 391         if (tname == NULL)
 392             errx(1, "malloc");
 393         c = encode_type (name, t->subtype, tname);
 394         fprintf (codefile,
 395                  "e = der_put_length_and_tag (p, len, ret, %s, %s, %s, &l);\n"
 396                  "if (e) return e;\np -= l; len -= l; ret += l;\n\n",
 397                  classname(t->tag.tagclass),
 398                  c ? "CONS" : "PRIM",
 399                  valuename(t->tag.tagclass, t->tag.tagvalue));
 400         free (tname);
 401         break;
 402     }
 403     case TChoice:{
 404         Member *m, *have_ellipsis = NULL;
 405         char *s;
 406
 407         if (t->members == NULL)
 408             break;
 409
 410         fprintf(codefile, "\n");
 411
 412         asprintf (&s, "(%s)", name);
 413         if (s == NULL)
 414             errx(1, "malloc");
 415         fprintf(codefile, "switch(%s->element) {\n", s);
 416
 417         ASN1_TAILQ_FOREACH_REVERSE(m, t->members, memhead, members) {
 418             char *s2;
 419
 420             if (m->ellipsis) {
 421                 have_ellipsis = m;
 422                 continue;
 423             }
 424
 425             fprintf (codefile, "case %s: {", m->label);
 426             asprintf(&s2, "%s(%s)->u.%s", m->optional ? "" : "&",
 427                      s, m->gen_name);
 428             if (s2 == NULL)
 429                 errx(1, "malloc");
 430             if (m->optional)
 431                 fprintf (codefile, "if(%s) {\n", s2);
 432             fprintf (codefile, "size_t %s_oldret = ret;\n", tmpstr);
 433             fprintf (codefile, "ret = 0;\n");
 434             constructed = encode_type (s2, m->type, m->gen_name);
 435             fprintf (codefile, "ret += %s_oldret;\n", tmpstr);
 436             if(m->optional)
 437                 fprintf (codefile, "}\n");
 438             fprintf(codefile, "break;\n");
 439             fprintf(codefile, "}\n");
 440             free (s2);
 441         }
 442         free (s);
 443         if (have_ellipsis) {
 444             fprintf(codefile,
 445                     "case %s: {\n"
 446                     "if (len < (%s)->u.%s.length)\n"
 447                     "return ASN1_OVERFLOW;\n"
 448                     "p -= (%s)->u.%s.length;\n"
 449                     "ret += (%s)->u.%s.length;\n"
 450                     "memcpy(p + 1, (%s)->u.%s.data, (%s)->u.%s.length);\n"
 451                     "break;\n"
 452                     "}\n",
 453                     have_ellipsis->label,
 454                     name, have_ellipsis->gen_name,
 455                     name, have_ellipsis->gen_name,
 456                     name, have_ellipsis->gen_name,
 457                     name, have_ellipsis->gen_name,
 458                     name, have_ellipsis->gen_name);
 459         }
 460         fprintf(codefile, "};\n");
 461         break;
 462     }
 463     case TOID:
 464         encode_primitive ("oid", name);
 465         constructed = 0;
 466         break;
 467     case TUTCTime:
 468         encode_primitive ("utctime", name);
 469         constructed = 0;
 470         break;
 471     case TUTF8String:
 472         encode_primitive ("utf8string", name);
 473         constructed = 0;
 474         break;
 475     case TPrintableString:
 476         encode_primitive ("printable_string", name);
 477         constructed = 0;
 478         break;
 479     case TIA5String:
 480         encode_primitive ("ia5_string", name);
 481         constructed = 0;
 482         break;
 483     case TBMPString:
 484         encode_primitive ("bmp_string", name);
 485         constructed = 0;
 486         break;
 487     case TUniversalString:
 488         encode_primitive ("universal_string", name);
 489         constructed = 0;
 490         break;
 491     case TVisibleString:
 492         encode_primitive ("visible_string", name);
 493         constructed = 0;
 494         break;
 495     case TNull:
 496         fprintf (codefile, "/* NULL */\n");
 497         constructed = 0;
 498         break;
 499     default:
 500         abort ();
 501     }
 502     return constructed;
 503 }
 504
 505 void
 506 generate_type_encode (const Symbol *s)
 507 {
 508     fprintf (headerfile,
 509              "int    "
 510              "encode_%s(unsigned char *, size_t, const %s *, size_t *);\n",
 511              s->gen_name, s->gen_name);
 512
 513     fprintf (codefile, "int\n"
 514              "encode_%s(unsigned char *p, size_t len,"
 515              " const %s *data, size_t *size)\n"
 516              "{\n",
 517              s->gen_name, s->gen_name);
 518
 519     switch (s->type->type) {
 520     case TInteger:
 521     case TBoolean:
 522     case TOctetString:
 523     case TGeneralizedTime:
 524     case TGeneralString:
 525     case TUTCTime:
 526     case TUTF8String:
 527     case TPrintableString:
 528     case TIA5String:
 529     case TBMPString:
 530     case TUniversalString:
 531     case TVisibleString:
 532     case TNull:
 533     case TBitString:
 534     case TEnumerated:
 535     case TOID:
 536     case TSequence:
 537     case TSequenceOf:
 538     case TSet:
 539     case TSetOf:
 540     case TTag:
 541     case TType:
 542     case TChoice:
 543         fprintf (codefile,
 544                  "size_t ret = 0;\n"
 545                  "size_t l;\n"
 546                  "int i, e;\n\n");
 547         fprintf(codefile, "i = 0;\n"); /* hack to avoid `unused variable' */
 548
 549         encode_type("data", s->type, "Top");
 550
 551         fprintf (codefile, "*size = ret;\n"
 552                  "return 0;\n");
 553         break;
 554     default:
 555         abort ();
 556     }
 557     fprintf (codefile, "}\n\n");
 558 }