1 /* $OpenBSD: asn1_lib.c,v 1.32 2014/07/11 14:49:12 miod Exp $ */ 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 <limits.h> 60 #include <stdio.h> 61 #include <string.h> 62 63 #include <openssl/asn1.h> 64 #include <openssl/asn1_mac.h> 65 #include <openssl/err.h> 66 67 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max); 68 static void asn1_put_length(unsigned char **pp, int length); 69 70 static int 71 _asn1_check_infinite_end(const unsigned char **p, long len) 72 { 73 /* If there is 0 or 1 byte left, the length check should pick 74 * things up */ 75 if (len <= 0) 76 return (1); 77 else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) { 78 (*p) += 2; 79 return (1); 80 } 81 return (0); 82 } 83 84 int 85 ASN1_check_infinite_end(unsigned char **p, long len) 86 { 87 return _asn1_check_infinite_end((const unsigned char **)p, len); 88 } 89 90 int 91 ASN1_const_check_infinite_end(const unsigned char **p, long len) 92 { 93 return _asn1_check_infinite_end(p, len); 94 } 95 96 int 97 ASN1_get_object(const unsigned char **pp, long *plength, int *ptag, 98 int *pclass, long omax) 99 { 100 int i, ret; 101 long l; 102 const unsigned char *p= *pp; 103 int tag, xclass, inf; 104 long max = omax; 105 106 if (!max) 107 goto err; 108 ret = (*p & V_ASN1_CONSTRUCTED); 109 xclass = (*p & V_ASN1_PRIVATE); 110 i= *p & V_ASN1_PRIMITIVE_TAG; 111 if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */ 112 p++; 113 if (--max == 0) 114 goto err; 115 l = 0; 116 while (*p & 0x80) { 117 l <<= 7L; 118 l |= *(p++) & 0x7f; 119 if (--max == 0) 120 goto err; 121 if (l > (INT_MAX >> 7L)) 122 goto err; 123 } 124 l <<= 7L; 125 l |= *(p++) & 0x7f; 126 tag = (int)l; 127 if (--max == 0) 128 goto err; 129 } else { 130 tag = i; 131 p++; 132 if (--max == 0) 133 goto err; 134 } 135 *ptag = tag; 136 *pclass = xclass; 137 if (!asn1_get_length(&p, &inf, plength, (int)max)) 138 goto err; 139 140 if (inf && !(ret & V_ASN1_CONSTRUCTED)) 141 goto err; 142 143 #if 0 144 fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 145 (int)p, *plength, omax, (int)*pp, (int)(p+ *plength), 146 (int)(omax+ *pp)); 147 148 #endif 149 if (*plength > (omax - (p - *pp))) { 150 ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG); 151 /* Set this so that even if things are not long enough 152 * the values are set correctly */ 153 ret |= 0x80; 154 } 155 *pp = p; 156 return (ret | inf); 157 158 err: 159 ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG); 160 return (0x80); 161 } 162 163 static int 164 asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max) 165 { 166 const unsigned char *p= *pp; 167 unsigned long ret = 0; 168 unsigned int i; 169 170 if (max-- < 1) 171 return (0); 172 if (*p == 0x80) { 173 *inf = 1; 174 ret = 0; 175 p++; 176 } else { 177 *inf = 0; 178 i= *p & 0x7f; 179 if (*(p++) & 0x80) { 180 if (max < (int)i) 181 return (0); 182 /* skip leading zeroes */ 183 while (i && *p == 0) { 184 p++; 185 i--; 186 } 187 if (i > sizeof(long)) 188 return 0; 189 while (i-- > 0) { 190 ret <<= 8L; 191 ret |= *(p++); 192 } 193 } else 194 ret = i; 195 } 196 if (ret > LONG_MAX) 197 return 0; 198 *pp = p; 199 *rl = (long)ret; 200 return (1); 201 } 202 203 /* class 0 is constructed 204 * constructed == 2 for indefinite length constructed */ 205 void 206 ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 207 int xclass) 208 { 209 unsigned char *p= *pp; 210 int i, ttag; 211 212 i = (constructed) ? V_ASN1_CONSTRUCTED : 0; 213 i |= (xclass & V_ASN1_PRIVATE); 214 if (tag < 31) 215 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG); 216 else { 217 *(p++) = i | V_ASN1_PRIMITIVE_TAG; 218 for(i = 0, ttag = tag; ttag > 0; i++) 219 ttag >>= 7; 220 ttag = i; 221 while (i-- > 0) { 222 p[i] = tag & 0x7f; 223 if (i != (ttag - 1)) 224 p[i] |= 0x80; 225 tag >>= 7; 226 } 227 p += ttag; 228 } 229 if (constructed == 2) 230 *(p++) = 0x80; 231 else 232 asn1_put_length(&p, length); 233 *pp = p; 234 } 235 236 int 237 ASN1_put_eoc(unsigned char **pp) 238 { 239 unsigned char *p = *pp; 240 241 *p++ = 0; 242 *p++ = 0; 243 *pp = p; 244 return 2; 245 } 246 247 static void 248 asn1_put_length(unsigned char **pp, int length) 249 { 250 unsigned char *p= *pp; 251 252 int i, l; 253 if (length <= 127) 254 *(p++) = (unsigned char)length; 255 else { 256 l = length; 257 for (i = 0; l > 0; i++) 258 l >>= 8; 259 *(p++) = i | 0x80; 260 l = i; 261 while (i-- > 0) { 262 p[i] = length & 0xff; 263 length >>= 8; 264 } 265 p += l; 266 } 267 *pp = p; 268 } 269 270 int 271 ASN1_object_size(int constructed, int length, int tag) 272 { 273 int ret; 274 275 ret = length; 276 ret++; 277 if (tag >= 31) { 278 while (tag > 0) { 279 tag >>= 7; 280 ret++; 281 } 282 } 283 if (constructed == 2) 284 return ret + 3; 285 ret++; 286 if (length > 127) { 287 while (length > 0) { 288 length >>= 8; 289 ret++; 290 } 291 } 292 return (ret); 293 } 294 295 static int 296 _asn1_Finish(ASN1_const_CTX *c) 297 { 298 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) { 299 if (!ASN1_const_check_infinite_end(&c->p, c->slen)) { 300 c->error = ERR_R_MISSING_ASN1_EOS; 301 return (0); 302 } 303 } 304 if (((c->slen != 0) && !(c->inf & 1)) || 305 ((c->slen < 0) && (c->inf & 1))) { 306 c->error = ERR_R_ASN1_LENGTH_MISMATCH; 307 return (0); 308 } 309 return (1); 310 } 311 312 int 313 asn1_Finish(ASN1_CTX *c) 314 { 315 return _asn1_Finish((ASN1_const_CTX *)c); 316 } 317 318 int 319 asn1_const_Finish(ASN1_const_CTX *c) 320 { 321 return _asn1_Finish(c); 322 } 323 324 int 325 asn1_GetSequence(ASN1_const_CTX *c, long *length) 326 { 327 const unsigned char *q; 328 329 q = c->p; 330 c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass), 331 *length); 332 if (c->inf & 0x80) { 333 c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL; 334 return (0); 335 } 336 if (c->tag != V_ASN1_SEQUENCE) { 337 c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE; 338 return (0); 339 } 340 (*length) -= (c->p - q); 341 if (c->max && (*length < 0)) { 342 c->error = ERR_R_ASN1_LENGTH_MISMATCH; 343 return (0); 344 } 345 if (c->inf == (1|V_ASN1_CONSTRUCTED)) 346 c->slen= *length+ *(c->pp) - c->p; 347 c->eos = 0; 348 return (1); 349 } 350 351 int 352 ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str) 353 { 354 if (str == NULL) 355 return 0; 356 dst->type = str->type; 357 if (!ASN1_STRING_set(dst, str->data, str->length)) 358 return 0; 359 dst->flags = str->flags; 360 return 1; 361 } 362 363 ASN1_STRING * 364 ASN1_STRING_dup(const ASN1_STRING *str) 365 { 366 ASN1_STRING *ret; 367 368 if (!str) 369 return NULL; 370 ret = ASN1_STRING_new(); 371 if (!ret) 372 return NULL; 373 if (!ASN1_STRING_copy(ret, str)) { 374 ASN1_STRING_free(ret); 375 return NULL; 376 } 377 return ret; 378 } 379 380 int 381 ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 382 { 383 const char *data = _data; 384 385 if (len < 0) { 386 if (data == NULL) 387 return (0); 388 else 389 len = strlen(data); 390 } 391 if ((str->length < len) || (str->data == NULL)) { 392 unsigned char *tmp; 393 tmp = realloc(str->data, len + 1); 394 if (tmp == NULL) { 395 ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE); 396 return (0); 397 } 398 str->data = tmp; 399 } 400 str->length = len; 401 if (data != NULL) { 402 memmove(str->data, data, len); 403 } 404 str->data[str->length]='\0'; 405 return (1); 406 } 407 408 void 409 ASN1_STRING_set0(ASN1_STRING *str, void *data, int len) 410 { 411 free(str->data); 412 str->data = data; 413 str->length = len; 414 } 415 416 ASN1_STRING * 417 ASN1_STRING_new(void) 418 { 419 return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 420 } 421 422 ASN1_STRING * 423 ASN1_STRING_type_new(int type) 424 { 425 ASN1_STRING *ret; 426 427 ret = malloc(sizeof(ASN1_STRING)); 428 if (ret == NULL) { 429 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE); 430 return (NULL); 431 } 432 ret->length = 0; 433 ret->type = type; 434 ret->data = NULL; 435 ret->flags = 0; 436 return (ret); 437 } 438 439 void 440 ASN1_STRING_free(ASN1_STRING *a) 441 { 442 if (a == NULL) 443 return; 444 if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) 445 free(a->data); 446 free(a); 447 } 448 449 int 450 ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) 451 { 452 int i; 453 454 i = (a->length - b->length); 455 if (i == 0) { 456 i = memcmp(a->data, b->data, a->length); 457 if (i == 0) 458 return (a->type - b->type); 459 else 460 return (i); 461 } else 462 return (i); 463 } 464 465 void 466 asn1_add_error(const unsigned char *address, int offset) 467 { 468 ERR_asprintf_error_data("address=%p offset=%d", address, offset); 469 } 470 471 int 472 ASN1_STRING_length(const ASN1_STRING *x) 473 { 474 return M_ASN1_STRING_length(x); 475 } 476 477 void 478 ASN1_STRING_length_set(ASN1_STRING *x, int len) 479 { 480 M_ASN1_STRING_length_set(x, len); 481 return; 482 } 483 484 int 485 ASN1_STRING_type(ASN1_STRING *x) 486 { 487 return M_ASN1_STRING_type(x); 488 } 489 490 unsigned char * 491 ASN1_STRING_data(ASN1_STRING *x) 492 { 493 return M_ASN1_STRING_data(x); 494 } 495