Kinson Chik | a8fa74c | 2011-07-29 11:33:41 -0700 | [diff] [blame^] | 1 | /* tasn_dec.c */ |
| 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 3 | * project 2000. |
| 4 | */ |
| 5 | /* ==================================================================== |
| 6 | * Copyright (c) 2000-2005 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 | |
| 60 | #include <stddef.h> |
| 61 | #include <string.h> |
| 62 | #include <openssl/asn1.h> |
| 63 | #include <openssl/asn1t.h> |
| 64 | #include <openssl/objects.h> |
| 65 | #include <openssl/buffer.h> |
| 66 | #include <openssl/err.h> |
| 67 | |
| 68 | static int asn1_check_eoc(const unsigned char **in, long len); |
| 69 | static int asn1_find_end(const unsigned char **in, long len, char inf); |
| 70 | |
| 71 | static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len, |
| 72 | char inf, int tag, int aclass, int depth); |
| 73 | |
| 74 | static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen); |
| 75 | |
| 76 | static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, |
| 77 | char *inf, char *cst, |
| 78 | const unsigned char **in, long len, |
| 79 | int exptag, int expclass, char opt, |
| 80 | ASN1_TLC *ctx); |
| 81 | |
| 82 | static int asn1_template_ex_d2i(ASN1_VALUE **pval, |
| 83 | const unsigned char **in, long len, |
| 84 | const ASN1_TEMPLATE *tt, char opt, |
| 85 | ASN1_TLC *ctx); |
| 86 | static int asn1_template_noexp_d2i(ASN1_VALUE **val, |
| 87 | const unsigned char **in, long len, |
| 88 | const ASN1_TEMPLATE *tt, char opt, |
| 89 | ASN1_TLC *ctx); |
| 90 | static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, |
| 91 | const unsigned char **in, long len, |
| 92 | const ASN1_ITEM *it, |
| 93 | int tag, int aclass, char opt, ASN1_TLC *ctx); |
| 94 | |
| 95 | /* Table to convert tags to bit values, used for MSTRING type */ |
| 96 | static const unsigned long tag2bit[32] = { |
| 97 | 0, 0, 0, B_ASN1_BIT_STRING, /* tags 0 - 3 */ |
| 98 | B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,/* tags 4- 7 */ |
| 99 | B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags 8-11 */ |
| 100 | B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */ |
| 101 | B_ASN1_SEQUENCE,0,B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */ |
| 102 | B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING, /* tags 20-22 */ |
| 103 | B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, /* tags 23-24 */ |
| 104 | B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING, /* tags 25-27 */ |
| 105 | B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */ |
| 106 | }; |
| 107 | |
| 108 | unsigned long ASN1_tag2bit(int tag) |
| 109 | { |
| 110 | if ((tag < 0) || (tag > 30)) return 0; |
| 111 | return tag2bit[tag]; |
| 112 | } |
| 113 | |
| 114 | /* Macro to initialize and invalidate the cache */ |
| 115 | |
| 116 | #define asn1_tlc_clear(c) if (c) (c)->valid = 0 |
| 117 | /* Version to avoid compiler warning about 'c' always non-NULL */ |
| 118 | #define asn1_tlc_clear_nc(c) (c)->valid = 0 |
| 119 | |
| 120 | /* Decode an ASN1 item, this currently behaves just |
| 121 | * like a standard 'd2i' function. 'in' points to |
| 122 | * a buffer to read the data from, in future we will |
| 123 | * have more advanced versions that can input data |
| 124 | * a piece at a time and this will simply be a special |
| 125 | * case. |
| 126 | */ |
| 127 | |
| 128 | ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, |
| 129 | const unsigned char **in, long len, const ASN1_ITEM *it) |
| 130 | { |
| 131 | ASN1_TLC c; |
| 132 | ASN1_VALUE *ptmpval = NULL; |
| 133 | if (!pval) |
| 134 | pval = &ptmpval; |
| 135 | asn1_tlc_clear_nc(&c); |
| 136 | if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0) |
| 137 | return *pval; |
| 138 | return NULL; |
| 139 | } |
| 140 | |
| 141 | int ASN1_template_d2i(ASN1_VALUE **pval, |
| 142 | const unsigned char **in, long len, const ASN1_TEMPLATE *tt) |
| 143 | { |
| 144 | ASN1_TLC c; |
| 145 | asn1_tlc_clear_nc(&c); |
| 146 | return asn1_template_ex_d2i(pval, in, len, tt, 0, &c); |
| 147 | } |
| 148 | |
| 149 | |
| 150 | /* Decode an item, taking care of IMPLICIT tagging, if any. |
| 151 | * If 'opt' set and tag mismatch return -1 to handle OPTIONAL |
| 152 | */ |
| 153 | |
| 154 | int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, |
| 155 | const ASN1_ITEM *it, |
| 156 | int tag, int aclass, char opt, ASN1_TLC *ctx) |
| 157 | { |
| 158 | const ASN1_TEMPLATE *tt, *errtt = NULL; |
| 159 | const ASN1_COMPAT_FUNCS *cf; |
| 160 | const ASN1_EXTERN_FUNCS *ef; |
| 161 | const ASN1_AUX *aux = it->funcs; |
| 162 | ASN1_aux_cb *asn1_cb; |
| 163 | const unsigned char *p = NULL, *q; |
| 164 | unsigned char *wp=NULL; /* BIG FAT WARNING! BREAKS CONST WHERE USED */ |
| 165 | unsigned char imphack = 0, oclass; |
| 166 | char seq_eoc, seq_nolen, cst, isopt; |
| 167 | long tmplen; |
| 168 | int i; |
| 169 | int otag; |
| 170 | int ret = 0; |
| 171 | ASN1_VALUE *pchval, **pchptr, *ptmpval; |
| 172 | if (!pval) |
| 173 | return 0; |
| 174 | if (aux && aux->asn1_cb) |
| 175 | asn1_cb = aux->asn1_cb; |
| 176 | else asn1_cb = 0; |
| 177 | |
| 178 | switch(it->itype) |
| 179 | { |
| 180 | case ASN1_ITYPE_PRIMITIVE: |
| 181 | if (it->templates) |
| 182 | { |
| 183 | /* tagging or OPTIONAL is currently illegal on an item |
| 184 | * template because the flags can't get passed down. |
| 185 | * In practice this isn't a problem: we include the |
| 186 | * relevant flags from the item template in the |
| 187 | * template itself. |
| 188 | */ |
| 189 | if ((tag != -1) || opt) |
| 190 | { |
| 191 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 192 | ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE); |
| 193 | goto err; |
| 194 | } |
| 195 | return asn1_template_ex_d2i(pval, in, len, |
| 196 | it->templates, opt, ctx); |
| 197 | } |
| 198 | return asn1_d2i_ex_primitive(pval, in, len, it, |
| 199 | tag, aclass, opt, ctx); |
| 200 | break; |
| 201 | |
| 202 | case ASN1_ITYPE_MSTRING: |
| 203 | p = *in; |
| 204 | /* Just read in tag and class */ |
| 205 | ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL, |
| 206 | &p, len, -1, 0, 1, ctx); |
| 207 | if (!ret) |
| 208 | { |
| 209 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 210 | ERR_R_NESTED_ASN1_ERROR); |
| 211 | goto err; |
| 212 | } |
| 213 | |
| 214 | /* Must be UNIVERSAL class */ |
| 215 | if (oclass != V_ASN1_UNIVERSAL) |
| 216 | { |
| 217 | /* If OPTIONAL, assume this is OK */ |
| 218 | if (opt) return -1; |
| 219 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 220 | ASN1_R_MSTRING_NOT_UNIVERSAL); |
| 221 | goto err; |
| 222 | } |
| 223 | /* Check tag matches bit map */ |
| 224 | if (!(ASN1_tag2bit(otag) & it->utype)) |
| 225 | { |
| 226 | /* If OPTIONAL, assume this is OK */ |
| 227 | if (opt) |
| 228 | return -1; |
| 229 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 230 | ASN1_R_MSTRING_WRONG_TAG); |
| 231 | goto err; |
| 232 | } |
| 233 | return asn1_d2i_ex_primitive(pval, in, len, |
| 234 | it, otag, 0, 0, ctx); |
| 235 | |
| 236 | case ASN1_ITYPE_EXTERN: |
| 237 | /* Use new style d2i */ |
| 238 | ef = it->funcs; |
| 239 | return ef->asn1_ex_d2i(pval, in, len, |
| 240 | it, tag, aclass, opt, ctx); |
| 241 | |
| 242 | case ASN1_ITYPE_COMPAT: |
| 243 | /* we must resort to old style evil hackery */ |
| 244 | cf = it->funcs; |
| 245 | |
| 246 | /* If OPTIONAL see if it is there */ |
| 247 | if (opt) |
| 248 | { |
| 249 | int exptag; |
| 250 | p = *in; |
| 251 | if (tag == -1) |
| 252 | exptag = it->utype; |
| 253 | else exptag = tag; |
| 254 | /* Don't care about anything other than presence |
| 255 | * of expected tag */ |
| 256 | |
| 257 | ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL, |
| 258 | &p, len, exptag, aclass, 1, ctx); |
| 259 | if (!ret) |
| 260 | { |
| 261 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 262 | ERR_R_NESTED_ASN1_ERROR); |
| 263 | goto err; |
| 264 | } |
| 265 | if (ret == -1) |
| 266 | return -1; |
| 267 | } |
| 268 | |
| 269 | /* This is the old style evil hack IMPLICIT handling: |
| 270 | * since the underlying code is expecting a tag and |
| 271 | * class other than the one present we change the |
| 272 | * buffer temporarily then change it back afterwards. |
| 273 | * This doesn't and never did work for tags > 30. |
| 274 | * |
| 275 | * Yes this is *horrible* but it is only needed for |
| 276 | * old style d2i which will hopefully not be around |
| 277 | * for much longer. |
| 278 | * FIXME: should copy the buffer then modify it so |
| 279 | * the input buffer can be const: we should *always* |
| 280 | * copy because the old style d2i might modify the |
| 281 | * buffer. |
| 282 | */ |
| 283 | |
| 284 | if (tag != -1) |
| 285 | { |
| 286 | wp = *(unsigned char **)in; |
| 287 | imphack = *wp; |
| 288 | if (p == NULL) |
| 289 | { |
| 290 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 291 | ERR_R_NESTED_ASN1_ERROR); |
| 292 | goto err; |
| 293 | } |
| 294 | *wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED) |
| 295 | | it->utype); |
| 296 | } |
| 297 | |
| 298 | ptmpval = cf->asn1_d2i(pval, in, len); |
| 299 | |
| 300 | if (tag != -1) |
| 301 | *wp = imphack; |
| 302 | |
| 303 | if (ptmpval) |
| 304 | return 1; |
| 305 | |
| 306 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); |
| 307 | goto err; |
| 308 | |
| 309 | |
| 310 | case ASN1_ITYPE_CHOICE: |
| 311 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL)) |
| 312 | goto auxerr; |
| 313 | |
| 314 | /* Allocate structure */ |
| 315 | if (!*pval && !ASN1_item_ex_new(pval, it)) |
| 316 | { |
| 317 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 318 | ERR_R_NESTED_ASN1_ERROR); |
| 319 | goto err; |
| 320 | } |
| 321 | /* CHOICE type, try each possibility in turn */ |
| 322 | pchval = NULL; |
| 323 | p = *in; |
| 324 | for (i = 0, tt=it->templates; i < it->tcount; i++, tt++) |
| 325 | { |
| 326 | pchptr = asn1_get_field_ptr(pval, tt); |
| 327 | /* We mark field as OPTIONAL so its absence |
| 328 | * can be recognised. |
| 329 | */ |
| 330 | ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx); |
| 331 | /* If field not present, try the next one */ |
| 332 | if (ret == -1) |
| 333 | continue; |
| 334 | /* If positive return, read OK, break loop */ |
| 335 | if (ret > 0) |
| 336 | break; |
| 337 | /* Otherwise must be an ASN1 parsing error */ |
| 338 | errtt = tt; |
| 339 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 340 | ERR_R_NESTED_ASN1_ERROR); |
| 341 | goto err; |
| 342 | } |
| 343 | |
| 344 | /* Did we fall off the end without reading anything? */ |
| 345 | if (i == it->tcount) |
| 346 | { |
| 347 | /* If OPTIONAL, this is OK */ |
| 348 | if (opt) |
| 349 | { |
| 350 | /* Free and zero it */ |
| 351 | ASN1_item_ex_free(pval, it); |
| 352 | return -1; |
| 353 | } |
| 354 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 355 | ASN1_R_NO_MATCHING_CHOICE_TYPE); |
| 356 | goto err; |
| 357 | } |
| 358 | |
| 359 | asn1_set_choice_selector(pval, i, it); |
| 360 | *in = p; |
| 361 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL)) |
| 362 | goto auxerr; |
| 363 | return 1; |
| 364 | |
| 365 | case ASN1_ITYPE_NDEF_SEQUENCE: |
| 366 | case ASN1_ITYPE_SEQUENCE: |
| 367 | p = *in; |
| 368 | tmplen = len; |
| 369 | |
| 370 | /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */ |
| 371 | if (tag == -1) |
| 372 | { |
| 373 | tag = V_ASN1_SEQUENCE; |
| 374 | aclass = V_ASN1_UNIVERSAL; |
| 375 | } |
| 376 | /* Get SEQUENCE length and update len, p */ |
| 377 | ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst, |
| 378 | &p, len, tag, aclass, opt, ctx); |
| 379 | if (!ret) |
| 380 | { |
| 381 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 382 | ERR_R_NESTED_ASN1_ERROR); |
| 383 | goto err; |
| 384 | } |
| 385 | else if (ret == -1) |
| 386 | return -1; |
| 387 | if (aux && (aux->flags & ASN1_AFLG_BROKEN)) |
| 388 | { |
| 389 | len = tmplen - (p - *in); |
| 390 | seq_nolen = 1; |
| 391 | } |
| 392 | /* If indefinite we don't do a length check */ |
| 393 | else seq_nolen = seq_eoc; |
| 394 | if (!cst) |
| 395 | { |
| 396 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 397 | ASN1_R_SEQUENCE_NOT_CONSTRUCTED); |
| 398 | goto err; |
| 399 | } |
| 400 | |
| 401 | if (!*pval && !ASN1_item_ex_new(pval, it)) |
| 402 | { |
| 403 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 404 | ERR_R_NESTED_ASN1_ERROR); |
| 405 | goto err; |
| 406 | } |
| 407 | |
| 408 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL)) |
| 409 | goto auxerr; |
| 410 | |
| 411 | /* Get each field entry */ |
| 412 | for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) |
| 413 | { |
| 414 | const ASN1_TEMPLATE *seqtt; |
| 415 | ASN1_VALUE **pseqval; |
| 416 | seqtt = asn1_do_adb(pval, tt, 1); |
| 417 | if (!seqtt) |
| 418 | goto err; |
| 419 | pseqval = asn1_get_field_ptr(pval, seqtt); |
| 420 | /* Have we ran out of data? */ |
| 421 | if (!len) |
| 422 | break; |
| 423 | q = p; |
| 424 | if (asn1_check_eoc(&p, len)) |
| 425 | { |
| 426 | if (!seq_eoc) |
| 427 | { |
| 428 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 429 | ASN1_R_UNEXPECTED_EOC); |
| 430 | goto err; |
| 431 | } |
| 432 | len -= p - q; |
| 433 | seq_eoc = 0; |
| 434 | q = p; |
| 435 | break; |
| 436 | } |
| 437 | /* This determines the OPTIONAL flag value. The field |
| 438 | * cannot be omitted if it is the last of a SEQUENCE |
| 439 | * and there is still data to be read. This isn't |
| 440 | * strictly necessary but it increases efficiency in |
| 441 | * some cases. |
| 442 | */ |
| 443 | if (i == (it->tcount - 1)) |
| 444 | isopt = 0; |
| 445 | else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL); |
| 446 | /* attempt to read in field, allowing each to be |
| 447 | * OPTIONAL */ |
| 448 | |
| 449 | ret = asn1_template_ex_d2i(pseqval, &p, len, |
| 450 | seqtt, isopt, ctx); |
| 451 | if (!ret) |
| 452 | { |
| 453 | errtt = seqtt; |
| 454 | goto err; |
| 455 | } |
| 456 | else if (ret == -1) |
| 457 | { |
| 458 | /* OPTIONAL component absent. |
| 459 | * Free and zero the field. |
| 460 | */ |
| 461 | ASN1_template_free(pseqval, seqtt); |
| 462 | continue; |
| 463 | } |
| 464 | /* Update length */ |
| 465 | len -= p - q; |
| 466 | } |
| 467 | |
| 468 | /* Check for EOC if expecting one */ |
| 469 | if (seq_eoc && !asn1_check_eoc(&p, len)) |
| 470 | { |
| 471 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC); |
| 472 | goto err; |
| 473 | } |
| 474 | /* Check all data read */ |
| 475 | if (!seq_nolen && len) |
| 476 | { |
| 477 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 478 | ASN1_R_SEQUENCE_LENGTH_MISMATCH); |
| 479 | goto err; |
| 480 | } |
| 481 | |
| 482 | /* If we get here we've got no more data in the SEQUENCE, |
| 483 | * however we may not have read all fields so check all |
| 484 | * remaining are OPTIONAL and clear any that are. |
| 485 | */ |
| 486 | for (; i < it->tcount; tt++, i++) |
| 487 | { |
| 488 | const ASN1_TEMPLATE *seqtt; |
| 489 | seqtt = asn1_do_adb(pval, tt, 1); |
| 490 | if (!seqtt) |
| 491 | goto err; |
| 492 | if (seqtt->flags & ASN1_TFLG_OPTIONAL) |
| 493 | { |
| 494 | ASN1_VALUE **pseqval; |
| 495 | pseqval = asn1_get_field_ptr(pval, seqtt); |
| 496 | ASN1_template_free(pseqval, seqtt); |
| 497 | } |
| 498 | else |
| 499 | { |
| 500 | errtt = seqtt; |
| 501 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, |
| 502 | ASN1_R_FIELD_MISSING); |
| 503 | goto err; |
| 504 | } |
| 505 | } |
| 506 | /* Save encoding */ |
| 507 | if (!asn1_enc_save(pval, *in, p - *in, it)) |
| 508 | goto auxerr; |
| 509 | *in = p; |
| 510 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL)) |
| 511 | goto auxerr; |
| 512 | return 1; |
| 513 | |
| 514 | default: |
| 515 | return 0; |
| 516 | } |
| 517 | auxerr: |
| 518 | ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR); |
| 519 | err: |
| 520 | ASN1_item_ex_free(pval, it); |
| 521 | if (errtt) |
| 522 | ERR_add_error_data(4, "Field=", errtt->field_name, |
| 523 | ", Type=", it->sname); |
| 524 | else |
| 525 | ERR_add_error_data(2, "Type=", it->sname); |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | /* Templates are handled with two separate functions. |
| 530 | * One handles any EXPLICIT tag and the other handles the rest. |
| 531 | */ |
| 532 | |
| 533 | static int asn1_template_ex_d2i(ASN1_VALUE **val, |
| 534 | const unsigned char **in, long inlen, |
| 535 | const ASN1_TEMPLATE *tt, char opt, |
| 536 | ASN1_TLC *ctx) |
| 537 | { |
| 538 | int flags, aclass; |
| 539 | int ret; |
| 540 | long len; |
| 541 | const unsigned char *p, *q; |
| 542 | char exp_eoc; |
| 543 | if (!val) |
| 544 | return 0; |
| 545 | flags = tt->flags; |
| 546 | aclass = flags & ASN1_TFLG_TAG_CLASS; |
| 547 | |
| 548 | p = *in; |
| 549 | |
| 550 | /* Check if EXPLICIT tag expected */ |
| 551 | if (flags & ASN1_TFLG_EXPTAG) |
| 552 | { |
| 553 | char cst; |
| 554 | /* Need to work out amount of data available to the inner |
| 555 | * content and where it starts: so read in EXPLICIT header to |
| 556 | * get the info. |
| 557 | */ |
| 558 | ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst, |
| 559 | &p, inlen, tt->tag, aclass, opt, ctx); |
| 560 | q = p; |
| 561 | if (!ret) |
| 562 | { |
| 563 | ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, |
| 564 | ERR_R_NESTED_ASN1_ERROR); |
| 565 | return 0; |
| 566 | } |
| 567 | else if (ret == -1) |
| 568 | return -1; |
| 569 | if (!cst) |
| 570 | { |
| 571 | ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, |
| 572 | ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED); |
| 573 | return 0; |
| 574 | } |
| 575 | /* We've found the field so it can't be OPTIONAL now */ |
| 576 | ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx); |
| 577 | if (!ret) |
| 578 | { |
| 579 | ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, |
| 580 | ERR_R_NESTED_ASN1_ERROR); |
| 581 | return 0; |
| 582 | } |
| 583 | /* We read the field in OK so update length */ |
| 584 | len -= p - q; |
| 585 | if (exp_eoc) |
| 586 | { |
| 587 | /* If NDEF we must have an EOC here */ |
| 588 | if (!asn1_check_eoc(&p, len)) |
| 589 | { |
| 590 | ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, |
| 591 | ASN1_R_MISSING_EOC); |
| 592 | goto err; |
| 593 | } |
| 594 | } |
| 595 | else |
| 596 | { |
| 597 | /* Otherwise we must hit the EXPLICIT tag end or its |
| 598 | * an error */ |
| 599 | if (len) |
| 600 | { |
| 601 | ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, |
| 602 | ASN1_R_EXPLICIT_LENGTH_MISMATCH); |
| 603 | goto err; |
| 604 | } |
| 605 | } |
| 606 | } |
| 607 | else |
| 608 | return asn1_template_noexp_d2i(val, in, inlen, |
| 609 | tt, opt, ctx); |
| 610 | |
| 611 | *in = p; |
| 612 | return 1; |
| 613 | |
| 614 | err: |
| 615 | ASN1_template_free(val, tt); |
| 616 | return 0; |
| 617 | } |
| 618 | |
| 619 | static int asn1_template_noexp_d2i(ASN1_VALUE **val, |
| 620 | const unsigned char **in, long len, |
| 621 | const ASN1_TEMPLATE *tt, char opt, |
| 622 | ASN1_TLC *ctx) |
| 623 | { |
| 624 | int flags, aclass; |
| 625 | int ret; |
| 626 | const unsigned char *p, *q; |
| 627 | if (!val) |
| 628 | return 0; |
| 629 | flags = tt->flags; |
| 630 | aclass = flags & ASN1_TFLG_TAG_CLASS; |
| 631 | |
| 632 | p = *in; |
| 633 | q = p; |
| 634 | |
| 635 | if (flags & ASN1_TFLG_SK_MASK) |
| 636 | { |
| 637 | /* SET OF, SEQUENCE OF */ |
| 638 | int sktag, skaclass; |
| 639 | char sk_eoc; |
| 640 | /* First work out expected inner tag value */ |
| 641 | if (flags & ASN1_TFLG_IMPTAG) |
| 642 | { |
| 643 | sktag = tt->tag; |
| 644 | skaclass = aclass; |
| 645 | } |
| 646 | else |
| 647 | { |
| 648 | skaclass = V_ASN1_UNIVERSAL; |
| 649 | if (flags & ASN1_TFLG_SET_OF) |
| 650 | sktag = V_ASN1_SET; |
| 651 | else |
| 652 | sktag = V_ASN1_SEQUENCE; |
| 653 | } |
| 654 | /* Get the tag */ |
| 655 | ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL, |
| 656 | &p, len, sktag, skaclass, opt, ctx); |
| 657 | if (!ret) |
| 658 | { |
| 659 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, |
| 660 | ERR_R_NESTED_ASN1_ERROR); |
| 661 | return 0; |
| 662 | } |
| 663 | else if (ret == -1) |
| 664 | return -1; |
| 665 | if (!*val) |
| 666 | *val = (ASN1_VALUE *)sk_new_null(); |
| 667 | else |
| 668 | { |
| 669 | /* We've got a valid STACK: free up any items present */ |
| 670 | STACK_OF(ASN1_VALUE) *sktmp |
| 671 | = (STACK_OF(ASN1_VALUE) *)*val; |
| 672 | ASN1_VALUE *vtmp; |
| 673 | while(sk_ASN1_VALUE_num(sktmp) > 0) |
| 674 | { |
| 675 | vtmp = sk_ASN1_VALUE_pop(sktmp); |
| 676 | ASN1_item_ex_free(&vtmp, |
| 677 | ASN1_ITEM_ptr(tt->item)); |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | if (!*val) |
| 682 | { |
| 683 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, |
| 684 | ERR_R_MALLOC_FAILURE); |
| 685 | goto err; |
| 686 | } |
| 687 | |
| 688 | /* Read as many items as we can */ |
| 689 | while(len > 0) |
| 690 | { |
| 691 | ASN1_VALUE *skfield; |
| 692 | q = p; |
| 693 | /* See if EOC found */ |
| 694 | if (asn1_check_eoc(&p, len)) |
| 695 | { |
| 696 | if (!sk_eoc) |
| 697 | { |
| 698 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, |
| 699 | ASN1_R_UNEXPECTED_EOC); |
| 700 | goto err; |
| 701 | } |
| 702 | len -= p - q; |
| 703 | sk_eoc = 0; |
| 704 | break; |
| 705 | } |
| 706 | skfield = NULL; |
| 707 | if (!ASN1_item_ex_d2i(&skfield, &p, len, |
| 708 | ASN1_ITEM_ptr(tt->item), |
| 709 | -1, 0, 0, ctx)) |
| 710 | { |
| 711 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, |
| 712 | ERR_R_NESTED_ASN1_ERROR); |
| 713 | goto err; |
| 714 | } |
| 715 | len -= p - q; |
| 716 | if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, |
| 717 | skfield)) |
| 718 | { |
| 719 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, |
| 720 | ERR_R_MALLOC_FAILURE); |
| 721 | goto err; |
| 722 | } |
| 723 | } |
| 724 | if (sk_eoc) |
| 725 | { |
| 726 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC); |
| 727 | goto err; |
| 728 | } |
| 729 | } |
| 730 | else if (flags & ASN1_TFLG_IMPTAG) |
| 731 | { |
| 732 | /* IMPLICIT tagging */ |
| 733 | ret = ASN1_item_ex_d2i(val, &p, len, |
| 734 | ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx); |
| 735 | if (!ret) |
| 736 | { |
| 737 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, |
| 738 | ERR_R_NESTED_ASN1_ERROR); |
| 739 | goto err; |
| 740 | } |
| 741 | else if (ret == -1) |
| 742 | return -1; |
| 743 | } |
| 744 | else |
| 745 | { |
| 746 | /* Nothing special */ |
| 747 | ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), |
| 748 | -1, 0, opt, ctx); |
| 749 | if (!ret) |
| 750 | { |
| 751 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, |
| 752 | ERR_R_NESTED_ASN1_ERROR); |
| 753 | goto err; |
| 754 | } |
| 755 | else if (ret == -1) |
| 756 | return -1; |
| 757 | } |
| 758 | |
| 759 | *in = p; |
| 760 | return 1; |
| 761 | |
| 762 | err: |
| 763 | ASN1_template_free(val, tt); |
| 764 | return 0; |
| 765 | } |
| 766 | |
| 767 | static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, |
| 768 | const unsigned char **in, long inlen, |
| 769 | const ASN1_ITEM *it, |
| 770 | int tag, int aclass, char opt, ASN1_TLC *ctx) |
| 771 | { |
| 772 | int ret = 0, utype; |
| 773 | long plen; |
| 774 | char cst, inf, free_cont = 0; |
| 775 | const unsigned char *p; |
| 776 | BUF_MEM buf; |
| 777 | const unsigned char *cont = NULL; |
| 778 | long len; |
| 779 | if (!pval) |
| 780 | { |
| 781 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL); |
| 782 | return 0; /* Should never happen */ |
| 783 | } |
| 784 | |
| 785 | if (it->itype == ASN1_ITYPE_MSTRING) |
| 786 | { |
| 787 | utype = tag; |
| 788 | tag = -1; |
| 789 | } |
| 790 | else |
| 791 | utype = it->utype; |
| 792 | |
| 793 | if (utype == V_ASN1_ANY) |
| 794 | { |
| 795 | /* If type is ANY need to figure out type from tag */ |
| 796 | unsigned char oclass; |
| 797 | if (tag >= 0) |
| 798 | { |
| 799 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, |
| 800 | ASN1_R_ILLEGAL_TAGGED_ANY); |
| 801 | return 0; |
| 802 | } |
| 803 | if (opt) |
| 804 | { |
| 805 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, |
| 806 | ASN1_R_ILLEGAL_OPTIONAL_ANY); |
| 807 | return 0; |
| 808 | } |
| 809 | p = *in; |
| 810 | ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL, |
| 811 | &p, inlen, -1, 0, 0, ctx); |
| 812 | if (!ret) |
| 813 | { |
| 814 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, |
| 815 | ERR_R_NESTED_ASN1_ERROR); |
| 816 | return 0; |
| 817 | } |
| 818 | if (oclass != V_ASN1_UNIVERSAL) |
| 819 | utype = V_ASN1_OTHER; |
| 820 | } |
| 821 | if (tag == -1) |
| 822 | { |
| 823 | tag = utype; |
| 824 | aclass = V_ASN1_UNIVERSAL; |
| 825 | } |
| 826 | p = *in; |
| 827 | /* Check header */ |
| 828 | ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst, |
| 829 | &p, inlen, tag, aclass, opt, ctx); |
| 830 | if (!ret) |
| 831 | { |
| 832 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR); |
| 833 | return 0; |
| 834 | } |
| 835 | else if (ret == -1) |
| 836 | return -1; |
| 837 | ret = 0; |
| 838 | /* SEQUENCE, SET and "OTHER" are left in encoded form */ |
| 839 | if ((utype == V_ASN1_SEQUENCE) |
| 840 | || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) |
| 841 | { |
| 842 | /* Clear context cache for type OTHER because the auto clear |
| 843 | * when we have a exact match wont work |
| 844 | */ |
| 845 | if (utype == V_ASN1_OTHER) |
| 846 | { |
| 847 | asn1_tlc_clear(ctx); |
| 848 | } |
| 849 | /* SEQUENCE and SET must be constructed */ |
| 850 | else if (!cst) |
| 851 | { |
| 852 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, |
| 853 | ASN1_R_TYPE_NOT_CONSTRUCTED); |
| 854 | return 0; |
| 855 | } |
| 856 | |
| 857 | cont = *in; |
| 858 | /* If indefinite length constructed find the real end */ |
| 859 | if (inf) |
| 860 | { |
| 861 | if (!asn1_find_end(&p, plen, inf)) |
| 862 | goto err; |
| 863 | len = p - cont; |
| 864 | } |
| 865 | else |
| 866 | { |
| 867 | len = p - cont + plen; |
| 868 | p += plen; |
| 869 | buf.data = NULL; |
| 870 | } |
| 871 | } |
| 872 | else if (cst) |
| 873 | { |
| 874 | buf.length = 0; |
| 875 | buf.max = 0; |
| 876 | buf.data = NULL; |
| 877 | /* Should really check the internal tags are correct but |
| 878 | * some things may get this wrong. The relevant specs |
| 879 | * say that constructed string types should be OCTET STRINGs |
| 880 | * internally irrespective of the type. So instead just check |
| 881 | * for UNIVERSAL class and ignore the tag. |
| 882 | */ |
| 883 | if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) |
| 884 | { |
| 885 | free_cont = 1; |
| 886 | goto err; |
| 887 | } |
| 888 | len = buf.length; |
| 889 | /* Append a final null to string */ |
| 890 | if (!BUF_MEM_grow_clean(&buf, len + 1)) |
| 891 | { |
| 892 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, |
| 893 | ERR_R_MALLOC_FAILURE); |
| 894 | return 0; |
| 895 | } |
| 896 | buf.data[len] = 0; |
| 897 | cont = (const unsigned char *)buf.data; |
| 898 | free_cont = 1; |
| 899 | } |
| 900 | else |
| 901 | { |
| 902 | cont = p; |
| 903 | len = plen; |
| 904 | p += plen; |
| 905 | } |
| 906 | |
| 907 | /* We now have content length and type: translate into a structure */ |
| 908 | if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it)) |
| 909 | goto err; |
| 910 | |
| 911 | *in = p; |
| 912 | ret = 1; |
| 913 | err: |
| 914 | if (free_cont && buf.data) OPENSSL_free(buf.data); |
| 915 | return ret; |
| 916 | } |
| 917 | |
| 918 | /* Translate ASN1 content octets into a structure */ |
| 919 | |
| 920 | int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, |
| 921 | int utype, char *free_cont, const ASN1_ITEM *it) |
| 922 | { |
| 923 | ASN1_VALUE **opval = NULL; |
| 924 | ASN1_STRING *stmp; |
| 925 | ASN1_TYPE *typ = NULL; |
| 926 | int ret = 0; |
| 927 | const ASN1_PRIMITIVE_FUNCS *pf; |
| 928 | ASN1_INTEGER **tint; |
| 929 | pf = it->funcs; |
| 930 | |
| 931 | if (pf && pf->prim_c2i) |
| 932 | return pf->prim_c2i(pval, cont, len, utype, free_cont, it); |
| 933 | /* If ANY type clear type and set pointer to internal value */ |
| 934 | if (it->utype == V_ASN1_ANY) |
| 935 | { |
| 936 | if (!*pval) |
| 937 | { |
| 938 | typ = ASN1_TYPE_new(); |
| 939 | if (typ == NULL) |
| 940 | goto err; |
| 941 | *pval = (ASN1_VALUE *)typ; |
| 942 | } |
| 943 | else |
| 944 | typ = (ASN1_TYPE *)*pval; |
| 945 | |
| 946 | if (utype != typ->type) |
| 947 | ASN1_TYPE_set(typ, utype, NULL); |
| 948 | opval = pval; |
| 949 | pval = &typ->value.asn1_value; |
| 950 | } |
| 951 | switch(utype) |
| 952 | { |
| 953 | case V_ASN1_OBJECT: |
| 954 | if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len)) |
| 955 | goto err; |
| 956 | break; |
| 957 | |
| 958 | case V_ASN1_NULL: |
| 959 | if (len) |
| 960 | { |
| 961 | ASN1err(ASN1_F_ASN1_EX_C2I, |
| 962 | ASN1_R_NULL_IS_WRONG_LENGTH); |
| 963 | goto err; |
| 964 | } |
| 965 | *pval = (ASN1_VALUE *)1; |
| 966 | break; |
| 967 | |
| 968 | case V_ASN1_BOOLEAN: |
| 969 | if (len != 1) |
| 970 | { |
| 971 | ASN1err(ASN1_F_ASN1_EX_C2I, |
| 972 | ASN1_R_BOOLEAN_IS_WRONG_LENGTH); |
| 973 | goto err; |
| 974 | } |
| 975 | else |
| 976 | { |
| 977 | ASN1_BOOLEAN *tbool; |
| 978 | tbool = (ASN1_BOOLEAN *)pval; |
| 979 | *tbool = *cont; |
| 980 | } |
| 981 | break; |
| 982 | |
| 983 | case V_ASN1_BIT_STRING: |
| 984 | if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len)) |
| 985 | goto err; |
| 986 | break; |
| 987 | |
| 988 | case V_ASN1_INTEGER: |
| 989 | case V_ASN1_NEG_INTEGER: |
| 990 | case V_ASN1_ENUMERATED: |
| 991 | case V_ASN1_NEG_ENUMERATED: |
| 992 | tint = (ASN1_INTEGER **)pval; |
| 993 | if (!c2i_ASN1_INTEGER(tint, &cont, len)) |
| 994 | goto err; |
| 995 | /* Fixup type to match the expected form */ |
| 996 | (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG); |
| 997 | break; |
| 998 | |
| 999 | case V_ASN1_OCTET_STRING: |
| 1000 | case V_ASN1_NUMERICSTRING: |
| 1001 | case V_ASN1_PRINTABLESTRING: |
| 1002 | case V_ASN1_T61STRING: |
| 1003 | case V_ASN1_VIDEOTEXSTRING: |
| 1004 | case V_ASN1_IA5STRING: |
| 1005 | case V_ASN1_UTCTIME: |
| 1006 | case V_ASN1_GENERALIZEDTIME: |
| 1007 | case V_ASN1_GRAPHICSTRING: |
| 1008 | case V_ASN1_VISIBLESTRING: |
| 1009 | case V_ASN1_GENERALSTRING: |
| 1010 | case V_ASN1_UNIVERSALSTRING: |
| 1011 | case V_ASN1_BMPSTRING: |
| 1012 | case V_ASN1_UTF8STRING: |
| 1013 | case V_ASN1_OTHER: |
| 1014 | case V_ASN1_SET: |
| 1015 | case V_ASN1_SEQUENCE: |
| 1016 | default: |
| 1017 | if (utype == V_ASN1_BMPSTRING && (len & 1)) |
| 1018 | { |
| 1019 | ASN1err(ASN1_F_ASN1_EX_C2I, |
| 1020 | ASN1_R_BMPSTRING_IS_WRONG_LENGTH); |
| 1021 | goto err; |
| 1022 | } |
| 1023 | if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) |
| 1024 | { |
| 1025 | ASN1err(ASN1_F_ASN1_EX_C2I, |
| 1026 | ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH); |
| 1027 | goto err; |
| 1028 | } |
| 1029 | /* All based on ASN1_STRING and handled the same */ |
| 1030 | if (!*pval) |
| 1031 | { |
| 1032 | stmp = ASN1_STRING_type_new(utype); |
| 1033 | if (!stmp) |
| 1034 | { |
| 1035 | ASN1err(ASN1_F_ASN1_EX_C2I, |
| 1036 | ERR_R_MALLOC_FAILURE); |
| 1037 | goto err; |
| 1038 | } |
| 1039 | *pval = (ASN1_VALUE *)stmp; |
| 1040 | } |
| 1041 | else |
| 1042 | { |
| 1043 | stmp = (ASN1_STRING *)*pval; |
| 1044 | stmp->type = utype; |
| 1045 | } |
| 1046 | /* If we've already allocated a buffer use it */ |
| 1047 | if (*free_cont) |
| 1048 | { |
| 1049 | if (stmp->data) |
| 1050 | OPENSSL_free(stmp->data); |
| 1051 | stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */ |
| 1052 | stmp->length = len; |
| 1053 | *free_cont = 0; |
| 1054 | } |
| 1055 | else |
| 1056 | { |
| 1057 | if (!ASN1_STRING_set(stmp, cont, len)) |
| 1058 | { |
| 1059 | ASN1err(ASN1_F_ASN1_EX_C2I, |
| 1060 | ERR_R_MALLOC_FAILURE); |
| 1061 | ASN1_STRING_free(stmp); |
| 1062 | *pval = NULL; |
| 1063 | goto err; |
| 1064 | } |
| 1065 | } |
| 1066 | break; |
| 1067 | } |
| 1068 | /* If ASN1_ANY and NULL type fix up value */ |
| 1069 | if (typ && (utype == V_ASN1_NULL)) |
| 1070 | typ->value.ptr = NULL; |
| 1071 | |
| 1072 | ret = 1; |
| 1073 | err: |
| 1074 | if (!ret) |
| 1075 | { |
| 1076 | ASN1_TYPE_free(typ); |
| 1077 | if (opval) |
| 1078 | *opval = NULL; |
| 1079 | } |
| 1080 | return ret; |
| 1081 | } |
| 1082 | |
| 1083 | |
| 1084 | /* This function finds the end of an ASN1 structure when passed its maximum |
| 1085 | * length, whether it is indefinite length and a pointer to the content. |
| 1086 | * This is more efficient than calling asn1_collect because it does not |
| 1087 | * recurse on each indefinite length header. |
| 1088 | */ |
| 1089 | |
| 1090 | static int asn1_find_end(const unsigned char **in, long len, char inf) |
| 1091 | { |
| 1092 | int expected_eoc; |
| 1093 | long plen; |
| 1094 | const unsigned char *p = *in, *q; |
| 1095 | /* If not indefinite length constructed just add length */ |
| 1096 | if (inf == 0) |
| 1097 | { |
| 1098 | *in += len; |
| 1099 | return 1; |
| 1100 | } |
| 1101 | expected_eoc = 1; |
| 1102 | /* Indefinite length constructed form. Find the end when enough EOCs |
| 1103 | * are found. If more indefinite length constructed headers |
| 1104 | * are encountered increment the expected eoc count otherwise just |
| 1105 | * skip to the end of the data. |
| 1106 | */ |
| 1107 | while (len > 0) |
| 1108 | { |
| 1109 | if(asn1_check_eoc(&p, len)) |
| 1110 | { |
| 1111 | expected_eoc--; |
| 1112 | if (expected_eoc == 0) |
| 1113 | break; |
| 1114 | len -= 2; |
| 1115 | continue; |
| 1116 | } |
| 1117 | q = p; |
| 1118 | /* Just read in a header: only care about the length */ |
| 1119 | if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len, |
| 1120 | -1, 0, 0, NULL)) |
| 1121 | { |
| 1122 | ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR); |
| 1123 | return 0; |
| 1124 | } |
| 1125 | if (inf) |
| 1126 | expected_eoc++; |
| 1127 | else |
| 1128 | p += plen; |
| 1129 | len -= p - q; |
| 1130 | } |
| 1131 | if (expected_eoc) |
| 1132 | { |
| 1133 | ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC); |
| 1134 | return 0; |
| 1135 | } |
| 1136 | *in = p; |
| 1137 | return 1; |
| 1138 | } |
| 1139 | /* This function collects the asn1 data from a constructred string |
| 1140 | * type into a buffer. The values of 'in' and 'len' should refer |
| 1141 | * to the contents of the constructed type and 'inf' should be set |
| 1142 | * if it is indefinite length. |
| 1143 | */ |
| 1144 | |
| 1145 | #ifndef ASN1_MAX_STRING_NEST |
| 1146 | /* This determines how many levels of recursion are permitted in ASN1 |
| 1147 | * string types. If it is not limited stack overflows can occur. If set |
| 1148 | * to zero no recursion is allowed at all. Although zero should be adequate |
| 1149 | * examples exist that require a value of 1. So 5 should be more than enough. |
| 1150 | */ |
| 1151 | #define ASN1_MAX_STRING_NEST 5 |
| 1152 | #endif |
| 1153 | |
| 1154 | |
| 1155 | static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len, |
| 1156 | char inf, int tag, int aclass, int depth) |
| 1157 | { |
| 1158 | const unsigned char *p, *q; |
| 1159 | long plen; |
| 1160 | char cst, ininf; |
| 1161 | p = *in; |
| 1162 | inf &= 1; |
| 1163 | /* If no buffer and not indefinite length constructed just pass over |
| 1164 | * the encoded data */ |
| 1165 | if (!buf && !inf) |
| 1166 | { |
| 1167 | *in += len; |
| 1168 | return 1; |
| 1169 | } |
| 1170 | while(len > 0) |
| 1171 | { |
| 1172 | q = p; |
| 1173 | /* Check for EOC */ |
| 1174 | if (asn1_check_eoc(&p, len)) |
| 1175 | { |
| 1176 | /* EOC is illegal outside indefinite length |
| 1177 | * constructed form */ |
| 1178 | if (!inf) |
| 1179 | { |
| 1180 | ASN1err(ASN1_F_ASN1_COLLECT, |
| 1181 | ASN1_R_UNEXPECTED_EOC); |
| 1182 | return 0; |
| 1183 | } |
| 1184 | inf = 0; |
| 1185 | break; |
| 1186 | } |
| 1187 | |
| 1188 | if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, |
| 1189 | len, tag, aclass, 0, NULL)) |
| 1190 | { |
| 1191 | ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR); |
| 1192 | return 0; |
| 1193 | } |
| 1194 | |
| 1195 | /* If indefinite length constructed update max length */ |
| 1196 | if (cst) |
| 1197 | { |
| 1198 | if (depth >= ASN1_MAX_STRING_NEST) |
| 1199 | { |
| 1200 | ASN1err(ASN1_F_ASN1_COLLECT, |
| 1201 | ASN1_R_NESTED_ASN1_STRING); |
| 1202 | return 0; |
| 1203 | } |
| 1204 | if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, |
| 1205 | depth + 1)) |
| 1206 | return 0; |
| 1207 | } |
| 1208 | else if (plen && !collect_data(buf, &p, plen)) |
| 1209 | return 0; |
| 1210 | len -= p - q; |
| 1211 | } |
| 1212 | if (inf) |
| 1213 | { |
| 1214 | ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC); |
| 1215 | return 0; |
| 1216 | } |
| 1217 | *in = p; |
| 1218 | return 1; |
| 1219 | } |
| 1220 | |
| 1221 | static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen) |
| 1222 | { |
| 1223 | int len; |
| 1224 | if (buf) |
| 1225 | { |
| 1226 | len = buf->length; |
| 1227 | if (!BUF_MEM_grow_clean(buf, len + plen)) |
| 1228 | { |
| 1229 | ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE); |
| 1230 | return 0; |
| 1231 | } |
| 1232 | memcpy(buf->data + len, *p, plen); |
| 1233 | } |
| 1234 | *p += plen; |
| 1235 | return 1; |
| 1236 | } |
| 1237 | |
| 1238 | /* Check for ASN1 EOC and swallow it if found */ |
| 1239 | |
| 1240 | static int asn1_check_eoc(const unsigned char **in, long len) |
| 1241 | { |
| 1242 | const unsigned char *p; |
| 1243 | if (len < 2) return 0; |
| 1244 | p = *in; |
| 1245 | if (!p[0] && !p[1]) |
| 1246 | { |
| 1247 | *in += 2; |
| 1248 | return 1; |
| 1249 | } |
| 1250 | return 0; |
| 1251 | } |
| 1252 | |
| 1253 | /* Check an ASN1 tag and length: a bit like ASN1_get_object |
| 1254 | * but it sets the length for indefinite length constructed |
| 1255 | * form, we don't know the exact length but we can set an |
| 1256 | * upper bound to the amount of data available minus the |
| 1257 | * header length just read. |
| 1258 | */ |
| 1259 | |
| 1260 | static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, |
| 1261 | char *inf, char *cst, |
| 1262 | const unsigned char **in, long len, |
| 1263 | int exptag, int expclass, char opt, |
| 1264 | ASN1_TLC *ctx) |
| 1265 | { |
| 1266 | int i; |
| 1267 | int ptag, pclass; |
| 1268 | long plen; |
| 1269 | const unsigned char *p, *q; |
| 1270 | p = *in; |
| 1271 | q = p; |
| 1272 | |
| 1273 | if (ctx && ctx->valid) |
| 1274 | { |
| 1275 | i = ctx->ret; |
| 1276 | plen = ctx->plen; |
| 1277 | pclass = ctx->pclass; |
| 1278 | ptag = ctx->ptag; |
| 1279 | p += ctx->hdrlen; |
| 1280 | } |
| 1281 | else |
| 1282 | { |
| 1283 | i = ASN1_get_object(&p, &plen, &ptag, &pclass, len); |
| 1284 | if (ctx) |
| 1285 | { |
| 1286 | ctx->ret = i; |
| 1287 | ctx->plen = plen; |
| 1288 | ctx->pclass = pclass; |
| 1289 | ctx->ptag = ptag; |
| 1290 | ctx->hdrlen = p - q; |
| 1291 | ctx->valid = 1; |
| 1292 | /* If definite length, and no error, length + |
| 1293 | * header can't exceed total amount of data available. |
| 1294 | */ |
| 1295 | if (!(i & 0x81) && ((plen + ctx->hdrlen) > len)) |
| 1296 | { |
| 1297 | ASN1err(ASN1_F_ASN1_CHECK_TLEN, |
| 1298 | ASN1_R_TOO_LONG); |
| 1299 | asn1_tlc_clear(ctx); |
| 1300 | return 0; |
| 1301 | } |
| 1302 | } |
| 1303 | } |
| 1304 | |
| 1305 | if (i & 0x80) |
| 1306 | { |
| 1307 | ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER); |
| 1308 | asn1_tlc_clear(ctx); |
| 1309 | return 0; |
| 1310 | } |
| 1311 | if (exptag >= 0) |
| 1312 | { |
| 1313 | if ((exptag != ptag) || (expclass != pclass)) |
| 1314 | { |
| 1315 | /* If type is OPTIONAL, not an error: |
| 1316 | * indicate missing type. |
| 1317 | */ |
| 1318 | if (opt) return -1; |
| 1319 | asn1_tlc_clear(ctx); |
| 1320 | ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG); |
| 1321 | return 0; |
| 1322 | } |
| 1323 | /* We have a tag and class match: |
| 1324 | * assume we are going to do something with it */ |
| 1325 | asn1_tlc_clear(ctx); |
| 1326 | } |
| 1327 | |
| 1328 | if (i & 1) |
| 1329 | plen = len - (p - q); |
| 1330 | |
| 1331 | if (inf) |
| 1332 | *inf = i & 1; |
| 1333 | |
| 1334 | if (cst) |
| 1335 | *cst = i & V_ASN1_CONSTRUCTED; |
| 1336 | |
| 1337 | if (olen) |
| 1338 | *olen = plen; |
| 1339 | |
| 1340 | if (oclass) |
| 1341 | *oclass = pclass; |
| 1342 | |
| 1343 | if (otag) |
| 1344 | *otag = ptag; |
| 1345 | |
| 1346 | *in = p; |
| 1347 | return 1; |
| 1348 | } |