1 /* $OpenBSD: asn1_lib.c,v 1.29 2014/07/10 13:58:22 jsing 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 "cryptlib.h" 64 #include <openssl/asn1.h> 65 #include <openssl/asn1_mac.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 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 /* Set this so that even if things are not long enough 149 * the values are set correctly */ 150 ret |= 0x80; 151 } 152 *pp = p; 153 return (ret | inf); 154 155 err: 156 ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG); 157 return (0x80); 158 } 159 160 static int 161 asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max) 162 { 163 const unsigned char *p= *pp; 164 unsigned long ret = 0; 165 unsigned int i; 166 167 if (max-- < 1) 168 return (0); 169 if (*p == 0x80) { 170 *inf = 1; 171 ret = 0; 172 p++; 173 } else { 174 *inf = 0; 175 i= *p & 0x7f; 176 if (*(p++) & 0x80) { 177 if (i > sizeof(long)) 178 return 0; 179 if (max-- == 0) 180 return (0); 181 while (i-- > 0) { 182 ret <<= 8L; 183 ret |= *(p++); 184 if (max-- == 0) 185 return (0); 186 } 187 } else 188 ret = i; 189 } 190 if (ret > LONG_MAX) 191 return 0; 192 *pp = p; 193 *rl = (long)ret; 194 return (1); 195 } 196 197 /* class 0 is constructed 198 * constructed == 2 for indefinite length constructed */ 199 void 200 ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 201 int xclass) 202 { 203 unsigned char *p= *pp; 204 int i, ttag; 205 206 i = (constructed) ? V_ASN1_CONSTRUCTED : 0; 207 i |= (xclass & V_ASN1_PRIVATE); 208 if (tag < 31) 209 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG); 210 else { 211 *(p++) = i | V_ASN1_PRIMITIVE_TAG; 212 for(i = 0, ttag = tag; ttag > 0; i++) 213 ttag >>= 7; 214 ttag = i; 215 while (i-- > 0) { 216 p[i] = tag & 0x7f; 217 if (i != (ttag - 1)) 218 p[i] |= 0x80; 219 tag >>= 7; 220 } 221 p += ttag; 222 } 223 if (constructed == 2) 224 *(p++) = 0x80; 225 else 226 asn1_put_length(&p, length); 227 *pp = p; 228 } 229 230 int 231 ASN1_put_eoc(unsigned char **pp) 232 { 233 unsigned char *p = *pp; 234 235 *p++ = 0; 236 *p++ = 0; 237 *pp = p; 238 return 2; 239 } 240 241 static void 242 asn1_put_length(unsigned char **pp, int length) 243 { 244 unsigned char *p= *pp; 245 246 int i, l; 247 if (length <= 127) 248 *(p++) = (unsigned char)length; 249 else { 250 l = length; 251 for (i = 0; l > 0; i++) 252 l >>= 8; 253 *(p++) = i | 0x80; 254 l = i; 255 while (i-- > 0) { 256 p[i] = length & 0xff; 257 length >>= 8; 258 } 259 p += l; 260 } 261 *pp = p; 262 } 263 264 int 265 ASN1_object_size(int constructed, int length, int tag) 266 { 267 int ret; 268 269 ret = length; 270 ret++; 271 if (tag >= 31) { 272 while (tag > 0) { 273 tag >>= 7; 274 ret++; 275 } 276 } 277 if (constructed == 2) 278 return ret + 3; 279 ret++; 280 if (length > 127) { 281 while (length > 0) { 282 length >>= 8; 283 ret++; 284 } 285 } 286 return (ret); 287 } 288 289 static int 290 _asn1_Finish(ASN1_const_CTX *c) 291 { 292 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) { 293 if (!ASN1_const_check_infinite_end(&c->p, c->slen)) { 294 c->error = ERR_R_MISSING_ASN1_EOS; 295 return (0); 296 } 297 } 298 if (((c->slen != 0) && !(c->inf & 1)) || 299 ((c->slen < 0) && (c->inf & 1))) { 300 c->error = ERR_R_ASN1_LENGTH_MISMATCH; 301 return (0); 302 } 303 return (1); 304 } 305 306 int 307 asn1_Finish(ASN1_CTX *c) 308 { 309 return _asn1_Finish((ASN1_const_CTX *)c); 310 } 311 312 int 313 asn1_const_Finish(ASN1_const_CTX *c) 314 { 315 return _asn1_Finish(c); 316 } 317 318 int 319 asn1_GetSequence(ASN1_const_CTX *c, long *length) 320 { 321 const unsigned char *q; 322 323 q = c->p; 324 c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass), 325 *length); 326 if (c->inf & 0x80) { 327 c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL; 328 return (0); 329 } 330 if (c->tag != V_ASN1_SEQUENCE) { 331 c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE; 332 return (0); 333 } 334 (*length) -= (c->p - q); 335 if (c->max && (*length < 0)) { 336 c->error = ERR_R_ASN1_LENGTH_MISMATCH; 337 return (0); 338 } 339 if (c->inf == (1|V_ASN1_CONSTRUCTED)) 340 c->slen= *length+ *(c->pp) - c->p; 341 c->eos = 0; 342 return (1); 343 } 344 345 int 346 ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str) 347 { 348 if (str == NULL) 349 return 0; 350 dst->type = str->type; 351 if (!ASN1_STRING_set(dst, str->data, str->length)) 352 return 0; 353 dst->flags = str->flags; 354 return 1; 355 } 356 357 ASN1_STRING * 358 ASN1_STRING_dup(const ASN1_STRING *str) 359 { 360 ASN1_STRING *ret; 361 362 if (!str) 363 return NULL; 364 ret = ASN1_STRING_new(); 365 if (!ret) 366 return NULL; 367 if (!ASN1_STRING_copy(ret, str)) { 368 ASN1_STRING_free(ret); 369 return NULL; 370 } 371 return ret; 372 } 373 374 int 375 ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 376 { 377 const char *data = _data; 378 379 if (len < 0) { 380 if (data == NULL) 381 return (0); 382 else 383 len = strlen(data); 384 } 385 if ((str->length < len) || (str->data == NULL)) { 386 unsigned char *tmp; 387 tmp = realloc(str->data, len + 1); 388 if (tmp == NULL) { 389 ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE); 390 return (0); 391 } 392 str->data = tmp; 393 } 394 str->length = len; 395 if (data != NULL) { 396 memmove(str->data, data, len); 397 } 398 str->data[str->length]='\0'; 399 return (1); 400 } 401 402 void 403 ASN1_STRING_set0(ASN1_STRING *str, void *data, int len) 404 { 405 free(str->data); 406 str->data = data; 407 str->length = len; 408 } 409 410 ASN1_STRING * 411 ASN1_STRING_new(void) 412 { 413 return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 414 } 415 416 ASN1_STRING * 417 ASN1_STRING_type_new(int type) 418 { 419 ASN1_STRING *ret; 420 421 ret = malloc(sizeof(ASN1_STRING)); 422 if (ret == NULL) { 423 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE); 424 return (NULL); 425 } 426 ret->length = 0; 427 ret->type = type; 428 ret->data = NULL; 429 ret->flags = 0; 430 return (ret); 431 } 432 433 void 434 ASN1_STRING_free(ASN1_STRING *a) 435 { 436 if (a == NULL) 437 return; 438 if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) 439 free(a->data); 440 free(a); 441 } 442 443 int 444 ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) 445 { 446 int i; 447 448 i = (a->length - b->length); 449 if (i == 0) { 450 i = memcmp(a->data, b->data, a->length); 451 if (i == 0) 452 return (a->type - b->type); 453 else 454 return (i); 455 } else 456 return (i); 457 } 458 459 void 460 asn1_add_error(const unsigned char *address, int offset) 461 { 462 ERR_asprintf_error_data("address=%p offset=%d", address, offset); 463 } 464 465 int 466 ASN1_STRING_length(const ASN1_STRING *x) 467 { 468 return M_ASN1_STRING_length(x); 469 } 470 471 void 472 ASN1_STRING_length_set(ASN1_STRING *x, int len) 473 { 474 M_ASN1_STRING_length_set(x, len); 475 return; 476 } 477 478 int 479 ASN1_STRING_type(ASN1_STRING *x) 480 { 481 return M_ASN1_STRING_type(x); 482 } 483 484 unsigned char * 485 ASN1_STRING_data(ASN1_STRING *x) 486 { 487 return M_ASN1_STRING_data(x); 488 } 489