asn1_lib.c revision 296341
1/* crypto/asn1/asn1_lib.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 <limits.h> 61#include "cryptlib.h" 62#include <openssl/asn1.h> 63#include <openssl/asn1_mac.h> 64 65static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, 66 int max); 67static void asn1_put_length(unsigned char **pp, int length); 68const char ASN1_version[] = "ASN.1" OPENSSL_VERSION_PTEXT; 69 70static int _asn1_check_infinite_end(const unsigned char **p, long len) 71{ 72 /* 73 * If there is 0 or 1 byte left, the length check should pick things up 74 */ 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 84int ASN1_check_infinite_end(unsigned char **p, long len) 85{ 86 return _asn1_check_infinite_end((const unsigned char **)p, len); 87} 88 89int ASN1_const_check_infinite_end(const unsigned char **p, long len) 90{ 91 return _asn1_check_infinite_end(p, len); 92} 93 94int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag, 95 int *pclass, long omax) 96{ 97 int i, ret; 98 long l; 99 const unsigned char *p = *pp; 100 int tag, xclass, inf; 101 long max = omax; 102 103 if (!max) 104 goto err; 105 ret = (*p & V_ASN1_CONSTRUCTED); 106 xclass = (*p & V_ASN1_PRIVATE); 107 i = *p & V_ASN1_PRIMITIVE_TAG; 108 if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */ 109 p++; 110 if (--max == 0) 111 goto err; 112 l = 0; 113 while (*p & 0x80) { 114 l <<= 7L; 115 l |= *(p++) & 0x7f; 116 if (--max == 0) 117 goto err; 118 if (l > (INT_MAX >> 7L)) 119 goto err; 120 } 121 l <<= 7L; 122 l |= *(p++) & 0x7f; 123 tag = (int)l; 124 if (--max == 0) 125 goto err; 126 } else { 127 tag = i; 128 p++; 129 if (--max == 0) 130 goto err; 131 } 132 *ptag = tag; 133 *pclass = xclass; 134 if (!asn1_get_length(&p, &inf, plength, (int)max)) 135 goto err; 136 137 if (inf && !(ret & V_ASN1_CONSTRUCTED)) 138 goto err; 139 140#if 0 141 fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 142 (int)p, *plength, omax, (int)*pp, (int)(p + *plength), 143 (int)(omax + *pp)); 144 145#endif 146 if (*plength > (omax - (p - *pp))) { 147 ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG); 148 /* 149 * Set this so that even if things are not long enough the values are 150 * set correctly 151 */ 152 ret |= 0x80; 153 } 154 *pp = p; 155 return (ret | inf); 156 err: 157 ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG); 158 return (0x80); 159} 160 161static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, 162 int max) 163{ 164 const unsigned char *p = *pp; 165 unsigned long ret = 0; 166 unsigned int i; 167 168 if (max-- < 1) 169 return (0); 170 if (*p == 0x80) { 171 *inf = 1; 172 ret = 0; 173 p++; 174 } else { 175 *inf = 0; 176 i = *p & 0x7f; 177 if (*(p++) & 0x80) { 178 if (i > sizeof(long)) 179 return 0; 180 if (max-- == 0) 181 return (0); 182 while (i-- > 0) { 183 ret <<= 8L; 184 ret |= *(p++); 185 if (max-- == 0) 186 return (0); 187 } 188 } else 189 ret = i; 190 } 191 if (ret > LONG_MAX) 192 return 0; 193 *pp = p; 194 *rl = (long)ret; 195 return (1); 196} 197 198/* 199 * class 0 is constructed constructed == 2 for indefinite length constructed 200 */ 201void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 202 int xclass) 203{ 204 unsigned char *p = *pp; 205 int i, ttag; 206 207 i = (constructed) ? V_ASN1_CONSTRUCTED : 0; 208 i |= (xclass & V_ASN1_PRIVATE); 209 if (tag < 31) 210 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG); 211 else { 212 *(p++) = i | V_ASN1_PRIMITIVE_TAG; 213 for (i = 0, ttag = tag; ttag > 0; i++) 214 ttag >>= 7; 215 ttag = i; 216 while (i-- > 0) { 217 p[i] = tag & 0x7f; 218 if (i != (ttag - 1)) 219 p[i] |= 0x80; 220 tag >>= 7; 221 } 222 p += ttag; 223 } 224 if (constructed == 2) 225 *(p++) = 0x80; 226 else 227 asn1_put_length(&p, length); 228 *pp = p; 229} 230 231int ASN1_put_eoc(unsigned char **pp) 232{ 233 unsigned char *p = *pp; 234 *p++ = 0; 235 *p++ = 0; 236 *pp = p; 237 return 2; 238} 239 240static void asn1_put_length(unsigned char **pp, int length) 241{ 242 unsigned char *p = *pp; 243 int i, l; 244 if (length <= 127) 245 *(p++) = (unsigned char)length; 246 else { 247 l = length; 248 for (i = 0; l > 0; i++) 249 l >>= 8; 250 *(p++) = i | 0x80; 251 l = i; 252 while (i-- > 0) { 253 p[i] = length & 0xff; 254 length >>= 8; 255 } 256 p += l; 257 } 258 *pp = p; 259} 260 261int ASN1_object_size(int constructed, int length, int tag) 262{ 263 int ret; 264 265 ret = length; 266 ret++; 267 if (tag >= 31) { 268 while (tag > 0) { 269 tag >>= 7; 270 ret++; 271 } 272 } 273 if (constructed == 2) 274 return ret + 3; 275 ret++; 276 if (length > 127) { 277 while (length > 0) { 278 length >>= 8; 279 ret++; 280 } 281 } 282 return (ret); 283} 284 285static int _asn1_Finish(ASN1_const_CTX *c) 286{ 287 if ((c->inf == (1 | V_ASN1_CONSTRUCTED)) && (!c->eos)) { 288 if (!ASN1_const_check_infinite_end(&c->p, c->slen)) { 289 c->error = ERR_R_MISSING_ASN1_EOS; 290 return (0); 291 } 292 } 293 if (((c->slen != 0) && !(c->inf & 1)) || ((c->slen < 0) && (c->inf & 1))) { 294 c->error = ERR_R_ASN1_LENGTH_MISMATCH; 295 return (0); 296 } 297 return (1); 298} 299 300int asn1_Finish(ASN1_CTX *c) 301{ 302 return _asn1_Finish((ASN1_const_CTX *)c); 303} 304 305int asn1_const_Finish(ASN1_const_CTX *c) 306{ 307 return _asn1_Finish(c); 308} 309 310int asn1_GetSequence(ASN1_const_CTX *c, long *length) 311{ 312 const unsigned char *q; 313 314 q = c->p; 315 c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass), 316 *length); 317 if (c->inf & 0x80) { 318 c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL; 319 return (0); 320 } 321 if (c->tag != V_ASN1_SEQUENCE) { 322 c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE; 323 return (0); 324 } 325 (*length) -= (c->p - q); 326 if (c->max && (*length < 0)) { 327 c->error = ERR_R_ASN1_LENGTH_MISMATCH; 328 return (0); 329 } 330 if (c->inf == (1 | V_ASN1_CONSTRUCTED)) 331 c->slen = *length + *(c->pp) - c->p; 332 c->eos = 0; 333 return (1); 334} 335 336int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str) 337{ 338 if (str == NULL) 339 return 0; 340 dst->type = str->type; 341 if (!ASN1_STRING_set(dst, str->data, str->length)) 342 return 0; 343 dst->flags = str->flags; 344 return 1; 345} 346 347ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str) 348{ 349 ASN1_STRING *ret; 350 if (!str) 351 return NULL; 352 ret = ASN1_STRING_new(); 353 if (!ret) 354 return NULL; 355 if (!ASN1_STRING_copy(ret, str)) { 356 ASN1_STRING_free(ret); 357 return NULL; 358 } 359 return ret; 360} 361 362int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 363{ 364 unsigned char *c; 365 const char *data = _data; 366 367 if (len < 0) { 368 if (data == NULL) 369 return (0); 370 else 371 len = strlen(data); 372 } 373 if ((str->length < len) || (str->data == NULL)) { 374 c = str->data; 375 if (c == NULL) 376 str->data = OPENSSL_malloc(len + 1); 377 else 378 str->data = OPENSSL_realloc(c, len + 1); 379 380 if (str->data == NULL) { 381 ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE); 382 str->data = c; 383 return (0); 384 } 385 } 386 str->length = len; 387 if (data != NULL) { 388 memcpy(str->data, data, len); 389 /* an allowance for strings :-) */ 390 str->data[len] = '\0'; 391 } 392 return (1); 393} 394 395void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len) 396{ 397 if (str->data) 398 OPENSSL_free(str->data); 399 str->data = data; 400 str->length = len; 401} 402 403ASN1_STRING *ASN1_STRING_new(void) 404{ 405 return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 406} 407 408ASN1_STRING *ASN1_STRING_type_new(int type) 409{ 410 ASN1_STRING *ret; 411 412 ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); 413 if (ret == NULL) { 414 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE); 415 return (NULL); 416 } 417 ret->length = 0; 418 ret->type = type; 419 ret->data = NULL; 420 ret->flags = 0; 421 return (ret); 422} 423 424void ASN1_STRING_free(ASN1_STRING *a) 425{ 426 if (a == NULL) 427 return; 428 if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) 429 OPENSSL_free(a->data); 430 OPENSSL_free(a); 431} 432 433void ASN1_STRING_clear_free(ASN1_STRING *a) 434{ 435 if (a && a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) 436 OPENSSL_cleanse(a->data, a->length); 437 ASN1_STRING_free(a); 438} 439 440int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) 441{ 442 int i; 443 444 i = (a->length - b->length); 445 if (i == 0) { 446 i = memcmp(a->data, b->data, a->length); 447 if (i == 0) 448 return (a->type - b->type); 449 else 450 return (i); 451 } else 452 return (i); 453} 454 455void asn1_add_error(const unsigned char *address, int offset) 456{ 457 char buf1[DECIMAL_SIZE(address) + 1], buf2[DECIMAL_SIZE(offset) + 1]; 458 459 BIO_snprintf(buf1, sizeof buf1, "%lu", (unsigned long)address); 460 BIO_snprintf(buf2, sizeof buf2, "%d", offset); 461 ERR_add_error_data(4, "address=", buf1, " offset=", buf2); 462} 463 464int ASN1_STRING_length(const ASN1_STRING *x) 465{ 466 return M_ASN1_STRING_length(x); 467} 468 469void ASN1_STRING_length_set(ASN1_STRING *x, int len) 470{ 471 M_ASN1_STRING_length_set(x, len); 472 return; 473} 474 475int ASN1_STRING_type(ASN1_STRING *x) 476{ 477 return M_ASN1_STRING_type(x); 478} 479 480unsigned char *ASN1_STRING_data(ASN1_STRING *x) 481{ 482 return M_ASN1_STRING_data(x); 483} 484