1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/asn1.h> 58 59 #include <limits.h> 60 #include <string.h> 61 62 #include <openssl/asn1_mac.h> 63 #include <openssl/err.h> 64 #include <openssl/mem.h> 65 66 #include "../internal.h" 67 68 69 /* Cross-module errors from crypto/x509/i2d_pr.c. */ 70 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_PUBLIC_KEY_TYPE) 71 72 /* Cross-module errors from crypto/x509/algorithm.c. */ 73 OPENSSL_DECLARE_ERROR_REASON(ASN1, CONTEXT_NOT_INITIALISED) 74 OPENSSL_DECLARE_ERROR_REASON(ASN1, DIGEST_AND_KEY_TYPE_NOT_SUPPORTED) 75 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_MESSAGE_DIGEST_ALGORITHM) 76 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_SIGNATURE_ALGORITHM) 77 OPENSSL_DECLARE_ERROR_REASON(ASN1, WRONG_PUBLIC_KEY_TYPE) 78 /* 79 * Cross-module errors from crypto/x509/asn1_gen.c. TODO(davidben): Remove 80 * these once asn1_gen.c is gone. 81 */ 82 OPENSSL_DECLARE_ERROR_REASON(ASN1, DEPTH_EXCEEDED) 83 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BITSTRING_FORMAT) 84 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BOOLEAN) 85 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_FORMAT) 86 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_HEX) 87 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_IMPLICIT_TAG) 88 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_INTEGER) 89 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NESTED_TAGGING) 90 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NULL_VALUE) 91 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_OBJECT) 92 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_TIME_VALUE) 93 OPENSSL_DECLARE_ERROR_REASON(ASN1, INTEGER_NOT_ASCII_FORMAT) 94 OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_MODIFIER) 95 OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_NUMBER) 96 OPENSSL_DECLARE_ERROR_REASON(ASN1, LIST_ERROR) 97 OPENSSL_DECLARE_ERROR_REASON(ASN1, MISSING_VALUE) 98 OPENSSL_DECLARE_ERROR_REASON(ASN1, NOT_ASCII_FORMAT) 99 OPENSSL_DECLARE_ERROR_REASON(ASN1, OBJECT_NOT_ASCII_FORMAT) 100 OPENSSL_DECLARE_ERROR_REASON(ASN1, SEQUENCE_OR_SET_NEEDS_CONFIG) 101 OPENSSL_DECLARE_ERROR_REASON(ASN1, TIME_NOT_ASCII_FORMAT) 102 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_FORMAT) 103 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_TAG) 104 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_TYPE) 105 106 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, 107 long max); 108 static void asn1_put_length(unsigned char **pp, int length); 109 110 static int _asn1_check_infinite_end(const unsigned char **p, long len) 111 { 112 /* 113 * If there is 0 or 1 byte left, the length check should pick things up 114 */ 115 if (len <= 0) 116 return (1); 117 else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) { 118 (*p) += 2; 119 return (1); 120 } 121 return (0); 122 } 123 124 int ASN1_check_infinite_end(unsigned char **p, long len) 125 { 126 return _asn1_check_infinite_end((const unsigned char **)p, len); 127 } 128 129 int ASN1_const_check_infinite_end(const unsigned char **p, long len) 130 { 131 return _asn1_check_infinite_end(p, len); 132 } 133 134 int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag, 135 int *pclass, long omax) 136 { 137 int i, ret; 138 long l; 139 const unsigned char *p = *pp; 140 int tag, xclass, inf; 141 long max = omax; 142 143 if (!max) 144 goto err; 145 ret = (*p & V_ASN1_CONSTRUCTED); 146 xclass = (*p & V_ASN1_PRIVATE); 147 i = *p & V_ASN1_PRIMITIVE_TAG; 148 if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */ 149 p++; 150 if (--max == 0) 151 goto err; 152 l = 0; 153 while (*p & 0x80) { 154 l <<= 7L; 155 l |= *(p++) & 0x7f; 156 if (--max == 0) 157 goto err; 158 if (l > (INT_MAX >> 7L)) 159 goto err; 160 } 161 l <<= 7L; 162 l |= *(p++) & 0x7f; 163 tag = (int)l; 164 if (--max == 0) 165 goto err; 166 } else { 167 tag = i; 168 p++; 169 if (--max == 0) 170 goto err; 171 } 172 173 /* To avoid ambiguity with V_ASN1_NEG, impose a limit on universal tags. */ 174 if (xclass == V_ASN1_UNIVERSAL && tag > V_ASN1_MAX_UNIVERSAL) 175 goto err; 176 177 *ptag = tag; 178 *pclass = xclass; 179 if (!asn1_get_length(&p, &inf, plength, max)) 180 goto err; 181 182 if (inf && !(ret & V_ASN1_CONSTRUCTED)) 183 goto err; 184 185 #if 0 186 fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 187 (int)p, *plength, omax, (int)*pp, (int)(p + *plength), 188 (int)(omax + *pp)); 189 190 #endif 191 if (*plength > (omax - (p - *pp))) { 192 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); 193 /* 194 * Set this so that even if things are not long enough the values are 195 * set correctly 196 */ 197 ret |= 0x80; 198 } 199 *pp = p; 200 return (ret | inf); 201 err: 202 OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG); 203 return (0x80); 204 } 205 206 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, 207 long max) 208 { 209 const unsigned char *p = *pp; 210 unsigned long ret = 0; 211 unsigned long i; 212 213 if (max-- < 1) 214 return 0; 215 if (*p == 0x80) { 216 *inf = 1; 217 ret = 0; 218 p++; 219 } else { 220 *inf = 0; 221 i = *p & 0x7f; 222 if (*(p++) & 0x80) { 223 if (i > sizeof(ret) || max < (long)i) 224 return 0; 225 while (i-- > 0) { 226 ret <<= 8L; 227 ret |= *(p++); 228 } 229 } else 230 ret = i; 231 } 232 if (ret > LONG_MAX) 233 return 0; 234 *pp = p; 235 *rl = (long)ret; 236 return 1; 237 } 238 239 /* 240 * class 0 is constructed constructed == 2 for indefinite length constructed 241 */ 242 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 243 int xclass) 244 { 245 unsigned char *p = *pp; 246 int i, ttag; 247 248 i = (constructed) ? V_ASN1_CONSTRUCTED : 0; 249 i |= (xclass & V_ASN1_PRIVATE); 250 if (tag < 31) 251 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG); 252 else { 253 *(p++) = i | V_ASN1_PRIMITIVE_TAG; 254 for (i = 0, ttag = tag; ttag > 0; i++) 255 ttag >>= 7; 256 ttag = i; 257 while (i-- > 0) { 258 p[i] = tag & 0x7f; 259 if (i != (ttag - 1)) 260 p[i] |= 0x80; 261 tag >>= 7; 262 } 263 p += ttag; 264 } 265 if (constructed == 2) 266 *(p++) = 0x80; 267 else 268 asn1_put_length(&p, length); 269 *pp = p; 270 } 271 272 int ASN1_put_eoc(unsigned char **pp) 273 { 274 unsigned char *p = *pp; 275 *p++ = 0; 276 *p++ = 0; 277 *pp = p; 278 return 2; 279 } 280 281 static void asn1_put_length(unsigned char **pp, int length) 282 { 283 unsigned char *p = *pp; 284 int i, l; 285 if (length <= 127) 286 *(p++) = (unsigned char)length; 287 else { 288 l = length; 289 for (i = 0; l > 0; i++) 290 l >>= 8; 291 *(p++) = i | 0x80; 292 l = i; 293 while (i-- > 0) { 294 p[i] = length & 0xff; 295 length >>= 8; 296 } 297 p += l; 298 } 299 *pp = p; 300 } 301 302 int ASN1_object_size(int constructed, int length, int tag) 303 { 304 int ret = 1; 305 if (length < 0) 306 return -1; 307 if (tag >= 31) { 308 while (tag > 0) { 309 tag >>= 7; 310 ret++; 311 } 312 } 313 if (constructed == 2) { 314 ret += 3; 315 } else { 316 ret++; 317 if (length > 127) { 318 int tmplen = length; 319 while (tmplen > 0) { 320 tmplen >>= 8; 321 ret++; 322 } 323 } 324 } 325 if (ret >= INT_MAX - length) 326 return -1; 327 return ret + length; 328 } 329 330 static int _asn1_Finish(ASN1_const_CTX *c) 331 { 332 if ((c->inf == (1 | V_ASN1_CONSTRUCTED)) && (!c->eos)) { 333 if (!ASN1_const_check_infinite_end(&c->p, c->slen)) { 334 c->error = ASN1_R_MISSING_ASN1_EOS; 335 return (0); 336 } 337 } 338 if (((c->slen != 0) && !(c->inf & 1)) || ((c->slen < 0) && (c->inf & 1))) { 339 c->error = ASN1_R_ASN1_LENGTH_MISMATCH; 340 return (0); 341 } 342 return (1); 343 } 344 345 int asn1_Finish(ASN1_CTX *c) 346 { 347 return _asn1_Finish((ASN1_const_CTX *)c); 348 } 349 350 int asn1_const_Finish(ASN1_const_CTX *c) 351 { 352 return _asn1_Finish(c); 353 } 354 355 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str) 356 { 357 if (str == NULL) 358 return 0; 359 dst->type = str->type; 360 if (!ASN1_STRING_set(dst, str->data, str->length)) 361 return 0; 362 dst->flags = str->flags; 363 return 1; 364 } 365 366 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str) 367 { 368 ASN1_STRING *ret; 369 if (!str) 370 return NULL; 371 ret = ASN1_STRING_new(); 372 if (!ret) 373 return NULL; 374 if (!ASN1_STRING_copy(ret, str)) { 375 ASN1_STRING_free(ret); 376 return NULL; 377 } 378 return ret; 379 } 380 381 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 382 { 383 unsigned char *c; 384 const char *data = _data; 385 386 if (len < 0) { 387 if (data == NULL) 388 return (0); 389 else 390 len = strlen(data); 391 } 392 if ((str->length <= len) || (str->data == NULL)) { 393 c = str->data; 394 if (c == NULL) 395 str->data = OPENSSL_malloc(len + 1); 396 else 397 str->data = OPENSSL_realloc(c, len + 1); 398 399 if (str->data == NULL) { 400 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 401 str->data = c; 402 return (0); 403 } 404 } 405 str->length = len; 406 if (data != NULL) { 407 OPENSSL_memcpy(str->data, data, len); 408 /* an allowance for strings :-) */ 409 str->data[len] = '\0'; 410 } 411 return (1); 412 } 413 414 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len) 415 { 416 if (str->data) 417 OPENSSL_free(str->data); 418 str->data = data; 419 str->length = len; 420 } 421 422 ASN1_STRING *ASN1_STRING_new(void) 423 { 424 return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 425 } 426 427 ASN1_STRING *ASN1_STRING_type_new(int type) 428 { 429 ASN1_STRING *ret; 430 431 ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); 432 if (ret == NULL) { 433 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 434 return (NULL); 435 } 436 ret->length = 0; 437 ret->type = type; 438 ret->data = NULL; 439 ret->flags = 0; 440 return (ret); 441 } 442 443 void ASN1_STRING_free(ASN1_STRING *a) 444 { 445 if (a == NULL) 446 return; 447 if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) 448 OPENSSL_free(a->data); 449 OPENSSL_free(a); 450 } 451 452 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) 453 { 454 int i; 455 456 i = (a->length - b->length); 457 if (i == 0) { 458 i = OPENSSL_memcmp(a->data, b->data, a->length); 459 if (i == 0) 460 return (a->type - b->type); 461 else 462 return (i); 463 } else 464 return (i); 465 } 466 467 int ASN1_STRING_length(const ASN1_STRING *x) 468 { 469 return M_ASN1_STRING_length(x); 470 } 471 472 void ASN1_STRING_length_set(ASN1_STRING *x, int len) 473 { 474 M_ASN1_STRING_length_set(x, len); 475 return; 476 } 477 478 int ASN1_STRING_type(ASN1_STRING *x) 479 { 480 return M_ASN1_STRING_type(x); 481 } 482 483 unsigned char *ASN1_STRING_data(ASN1_STRING *x) 484 { 485 return M_ASN1_STRING_data(x); 486 } 487
