1 /* $OpenBSD: asn1_lib.c,v 1.27 2014/06/12 15:49:27 deraadt 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 <stdio.h> 60 #include <limits.h> 61 #include "cryptlib.h" 62 #include <openssl/asn1.h> 63 #include <openssl/asn1_mac.h> 64 65 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max); 66 static void asn1_put_length(unsigned char **pp, int length); 67 const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT; 68 69 static int 70 _asn1_check_infinite_end(const unsigned char **p, long len) 71 { 72 /* If there is 0 or 1 byte left, the length check should pick 73 * things up */ 74 if (len <= 0) 75 return (1); 76 else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) { 77 (*p) += 2; 78 return (1); 79 } 80 return (0); 81 } 82 83 int 84 ASN1_check_infinite_end(unsigned char **p, long len) 85 { 86 return _asn1_check_infinite_end((const unsigned char **)p, len); 87 } 88 89 int 90 ASN1_const_check_infinite_end(const unsigned char **p, long len) 91 { 92 return _asn1_check_infinite_end(p, len); 93 } 94 95 int 96 ASN1_get_object(const unsigned char **pp, long *plength, int *ptag, 97 int *pclass, long omax) 98 { 99 int i, ret; 100 long l; 101 const unsigned char *p= *pp; 102 int tag, xclass, inf; 103 long max = omax; 104 105 if (!max) 106 goto err; 107 ret = (*p & V_ASN1_CONSTRUCTED); 108 xclass = (*p & V_ASN1_PRIVATE); 109 i= *p & V_ASN1_PRIMITIVE_TAG; 110 if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */ 111 p++; 112 if (--max == 0) 113 goto err; 114 l = 0; 115 while (*p & 0x80) { 116 l <<= 7L; 117 l |= *(p++) & 0x7f; 118 if (--max == 0) 119 goto err; 120 if (l > (INT_MAX >> 7L)) 121 goto err; 122 } 123 l <<= 7L; 124 l |= *(p++) & 0x7f; 125 tag = (int)l; 126 if (--max == 0) 127 goto err; 128 } else { 129 tag = i; 130 p++; 131 if (--max == 0) 132 goto err; 133 } 134 *ptag = tag; 135 *pclass = xclass; 136 if (!asn1_get_length(&p, &inf, plength, (int)max)) 137 goto err; 138 139 #if 0 140 fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 141 (int)p, *plength, omax, (int)*pp, (int)(p+ *plength), 142 (int)(omax+ *pp)); 143 144 #endif 145 if (*plength > (omax - (p - *pp))) { 146 ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG); 147 /* Set this so that even if things are not long enough 148 * the values are set correctly */ 149 ret |= 0x80; 150 } 151 *pp = p; 152 return (ret | inf); 153 154 err: 155 ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG); 156 return (0x80); 157 } 158 159 static int 160 asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max) 161 { 162 const unsigned char *p= *pp; 163 unsigned long ret = 0; 164 unsigned int i; 165 166 if (max-- < 1) 167 return (0); 168 if (*p == 0x80) { 169 *inf = 1; 170 ret = 0; 171 p++; 172 } else { 173 *inf = 0; 174 i= *p & 0x7f; 175 if (*(p++) & 0x80) { 176 if (i > sizeof(long)) 177 return 0; 178 if (max-- == 0) 179 return (0); 180 while (i-- > 0) { 181 ret <<= 8L; 182 ret |= *(p++); 183 if (max-- == 0) 184 return (0); 185 } 186 } else 187 ret = i; 188 } 189 if (ret > LONG_MAX) 190 return 0; 191 *pp = p; 192 *rl = (long)ret; 193 return (1); 194 } 195 196 /* class 0 is constructed 197 * constructed == 2 for indefinite length constructed */ 198 void 199 ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 200 int xclass) 201 { 202 unsigned char *p= *pp; 203 int i, ttag; 204 205 i = (constructed) ? V_ASN1_CONSTRUCTED : 0; 206 i |= (xclass & V_ASN1_PRIVATE); 207 if (tag < 31) 208 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG); 209 else { 210 *(p++) = i | V_ASN1_PRIMITIVE_TAG; 211 for(i = 0, ttag = tag; ttag > 0; i++) 212 ttag >>= 7; 213 ttag = i; 214 while (i-- > 0) { 215 p[i] = tag & 0x7f; 216 if (i != (ttag - 1)) 217 p[i] |= 0x80; 218 tag >>= 7; 219 } 220 p += ttag; 221 } 222 if (constructed == 2) 223 *(p++) = 0x80; 224 else 225 asn1_put_length(&p, length); 226 *pp = p; 227 } 228 229 int 230 ASN1_put_eoc(unsigned char **pp) 231 { 232 unsigned char *p = *pp; 233 234 *p++ = 0; 235 *p++ = 0; 236 *pp = p; 237 return 2; 238 } 239 240 static void 241 asn1_put_length(unsigned char **pp, int length) 242 { 243 unsigned char *p= *pp; 244 245 int i, l; 246 if (length <= 127) 247 *(p++) = (unsigned char)length; 248 else { 249 l = length; 250 for (i = 0; l > 0; i++) 251 l >>= 8; 252 *(p++) = i | 0x80; 253 l = i; 254 while (i-- > 0) { 255 p[i] = length & 0xff; 256 length >>= 8; 257 } 258 p += l; 259 } 260 *pp = p; 261 } 262 263 int 264 ASN1_object_size(int constructed, int length, int tag) 265 { 266 int ret; 267 268 ret = length; 269 ret++; 270 if (tag >= 31) { 271 while (tag > 0) { 272 tag >>= 7; 273 ret++; 274 } 275 } 276 if (constructed == 2) 277 return ret + 3; 278 ret++; 279 if (length > 127) { 280 while (length > 0) { 281 length >>= 8; 282 ret++; 283 } 284 } 285 return (ret); 286 } 287 288 static int 289 _asn1_Finish(ASN1_const_CTX *c) 290 { 291 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) { 292 if (!ASN1_const_check_infinite_end(&c->p, c->slen)) { 293 c->error = ERR_R_MISSING_ASN1_EOS; 294 return (0); 295 } 296 } 297 if (((c->slen != 0) && !(c->inf & 1)) || 298 ((c->slen < 0) && (c->inf & 1))) { 299 c->error = ERR_R_ASN1_LENGTH_MISMATCH; 300 return (0); 301 } 302 return (1); 303 } 304 305 int 306 asn1_Finish(ASN1_CTX *c) 307 { 308 return _asn1_Finish((ASN1_const_CTX *)c); 309 } 310 311 int 312 asn1_const_Finish(ASN1_const_CTX *c) 313 { 314 return _asn1_Finish(c); 315 } 316 317 int 318 asn1_GetSequence(ASN1_const_CTX *c, long *length) 319 { 320 const unsigned char *q; 321 322 q = c->p; 323 c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass), 324 *length); 325 if (c->inf & 0x80) { 326 c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL; 327 return (0); 328 } 329 if (c->tag != V_ASN1_SEQUENCE) { 330 c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE; 331 return (0); 332 } 333 (*length) -= (c->p - q); 334 if (c->max && (*length < 0)) { 335 c->error = ERR_R_ASN1_LENGTH_MISMATCH; 336 return (0); 337 } 338 if (c->inf == (1|V_ASN1_CONSTRUCTED)) 339 c->slen= *length+ *(c->pp) - c->p; 340 c->eos = 0; 341 return (1); 342 } 343 344 int 345 ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str) 346 { 347 if (str == NULL) 348 return 0; 349 dst->type = str->type; 350 if (!ASN1_STRING_set(dst, str->data, str->length)) 351 return 0; 352 dst->flags = str->flags; 353 return 1; 354 } 355 356 ASN1_STRING * 357 ASN1_STRING_dup(const ASN1_STRING *str) 358 { 359 ASN1_STRING *ret; 360 361 if (!str) 362 return NULL; 363 ret = ASN1_STRING_new(); 364 if (!ret) 365 return NULL; 366 if (!ASN1_STRING_copy(ret, str)) { 367 ASN1_STRING_free(ret); 368 return NULL; 369 } 370 return ret; 371 } 372 373 int 374 ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 375 { 376 const char *data = _data; 377 378 if (len < 0) { 379 if (data == NULL) 380 return (0); 381 else 382 len = strlen(data); 383 } 384 if ((str->length < len) || (str->data == NULL)) { 385 unsigned char *tmp; 386 tmp = realloc(str->data, len + 1); 387 if (tmp == NULL) { 388 ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE); 389 return (0); 390 } 391 str->data = tmp; 392 } 393 str->length = len; 394 if (data != NULL) { 395 memmove(str->data, data, len); 396 } 397 str->data[str->length]='\0'; 398 return (1); 399 } 400 401 void 402 ASN1_STRING_set0(ASN1_STRING *str, void *data, int len) 403 { 404 free(str->data); 405 str->data = data; 406 str->length = len; 407 } 408 409 ASN1_STRING * 410 ASN1_STRING_new(void) 411 { 412 return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 413 } 414 415 ASN1_STRING * 416 ASN1_STRING_type_new(int type) 417 { 418 ASN1_STRING *ret; 419 420 ret = malloc(sizeof(ASN1_STRING)); 421 if (ret == NULL) { 422 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE); 423 return (NULL); 424 } 425 ret->length = 0; 426 ret->type = type; 427 ret->data = NULL; 428 ret->flags = 0; 429 return (ret); 430 } 431 432 void 433 ASN1_STRING_free(ASN1_STRING *a) 434 { 435 if (a == NULL) 436 return; 437 if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) 438 free(a->data); 439 free(a); 440 } 441 442 int 443 ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) 444 { 445 int i; 446 447 i = (a->length - b->length); 448 if (i == 0) { 449 i = memcmp(a->data, b->data, a->length); 450 if (i == 0) 451 return (a->type - b->type); 452 else 453 return (i); 454 } else 455 return (i); 456 } 457 458 void 459 asn1_add_error(const unsigned char *address, int offset) 460 { 461 ERR_asprintf_error_data("address=%p offset=%d", address, offset); 462 } 463 464 int 465 ASN1_STRING_length(const ASN1_STRING *x) 466 { 467 return M_ASN1_STRING_length(x); 468 } 469 470 void 471 ASN1_STRING_length_set(ASN1_STRING *x, int len) 472 { 473 M_ASN1_STRING_length_set(x, len); 474 return; 475 } 476 477 int 478 ASN1_STRING_type(ASN1_STRING *x) 479 { 480 return M_ASN1_STRING_type(x); 481 } 482 483 unsigned char * 484 ASN1_STRING_data(ASN1_STRING *x) 485 { 486 return M_ASN1_STRING_data(x); 487 } 488