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 int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag, 111 int *pclass, long omax) 112 { 113 int i, ret; 114 long l; 115 const unsigned char *p = *pp; 116 int tag, xclass, inf; 117 long max = omax; 118 119 if (!max) 120 goto err; 121 ret = (*p & V_ASN1_CONSTRUCTED); 122 xclass = (*p & V_ASN1_PRIVATE); 123 i = *p & V_ASN1_PRIMITIVE_TAG; 124 if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */ 125 p++; 126 if (--max == 0) 127 goto err; 128 l = 0; 129 while (*p & 0x80) { 130 l <<= 7L; 131 l |= *(p++) & 0x7f; 132 if (--max == 0) 133 goto err; 134 if (l > (INT_MAX >> 7L)) 135 goto err; 136 } 137 l <<= 7L; 138 l |= *(p++) & 0x7f; 139 tag = (int)l; 140 if (--max == 0) 141 goto err; 142 } else { 143 tag = i; 144 p++; 145 if (--max == 0) 146 goto err; 147 } 148 149 /* To avoid ambiguity with V_ASN1_NEG, impose a limit on universal tags. */ 150 if (xclass == V_ASN1_UNIVERSAL && tag > V_ASN1_MAX_UNIVERSAL) 151 goto err; 152 153 *ptag = tag; 154 *pclass = xclass; 155 if (!asn1_get_length(&p, &inf, plength, max)) 156 goto err; 157 158 if (inf && !(ret & V_ASN1_CONSTRUCTED)) 159 goto err; 160 161 #if 0 162 fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 163 (int)p, *plength, omax, (int)*pp, (int)(p + *plength), 164 (int)(omax + *pp)); 165 166 #endif 167 if (*plength > (omax - (p - *pp))) { 168 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); 169 /* 170 * Set this so that even if things are not long enough the values are 171 * set correctly 172 */ 173 ret |= 0x80; 174 } 175 *pp = p; 176 return (ret | inf); 177 err: 178 OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG); 179 return (0x80); 180 } 181 182 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, 183 long max) 184 { 185 const unsigned char *p = *pp; 186 unsigned long ret = 0; 187 unsigned long i; 188 189 if (max-- < 1) 190 return 0; 191 if (*p == 0x80) { 192 *inf = 1; 193 ret = 0; 194 p++; 195 } else { 196 *inf = 0; 197 i = *p & 0x7f; 198 if (*(p++) & 0x80) { 199 if (i > sizeof(ret) || max < (long)i) 200 return 0; 201 while (i-- > 0) { 202 ret <<= 8L; 203 ret |= *(p++); 204 } 205 } else 206 ret = i; 207 } 208 /* 209 * Bound the length to comfortably fit in an int. Lengths in this module 210 * often switch between int and long without overflow checks. 211 */ 212 if (ret > INT_MAX / 2) 213 return 0; 214 *pp = p; 215 *rl = (long)ret; 216 return 1; 217 } 218 219 /* 220 * class 0 is constructed constructed == 2 for indefinite length constructed 221 */ 222 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 223 int xclass) 224 { 225 unsigned char *p = *pp; 226 int i, ttag; 227 228 i = (constructed) ? V_ASN1_CONSTRUCTED : 0; 229 i |= (xclass & V_ASN1_PRIVATE); 230 if (tag < 31) 231 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG); 232 else { 233 *(p++) = i | V_ASN1_PRIMITIVE_TAG; 234 for (i = 0, ttag = tag; ttag > 0; i++) 235 ttag >>= 7; 236 ttag = i; 237 while (i-- > 0) { 238 p[i] = tag & 0x7f; 239 if (i != (ttag - 1)) 240 p[i] |= 0x80; 241 tag >>= 7; 242 } 243 p += ttag; 244 } 245 if (constructed == 2) 246 *(p++) = 0x80; 247 else 248 asn1_put_length(&p, length); 249 *pp = p; 250 } 251 252 int ASN1_put_eoc(unsigned char **pp) 253 { 254 unsigned char *p = *pp; 255 *p++ = 0; 256 *p++ = 0; 257 *pp = p; 258 return 2; 259 } 260 261 static void asn1_put_length(unsigned char **pp, int length) 262 { 263 unsigned char *p = *pp; 264 int i, l; 265 if (length <= 127) 266 *(p++) = (unsigned char)length; 267 else { 268 l = length; 269 for (i = 0; l > 0; i++) 270 l >>= 8; 271 *(p++) = i | 0x80; 272 l = i; 273 while (i-- > 0) { 274 p[i] = length & 0xff; 275 length >>= 8; 276 } 277 p += l; 278 } 279 *pp = p; 280 } 281 282 int ASN1_object_size(int constructed, int length, int tag) 283 { 284 int ret = 1; 285 if (length < 0) 286 return -1; 287 if (tag >= 31) { 288 while (tag > 0) { 289 tag >>= 7; 290 ret++; 291 } 292 } 293 if (constructed == 2) { 294 ret += 3; 295 } else { 296 ret++; 297 if (length > 127) { 298 int tmplen = length; 299 while (tmplen > 0) { 300 tmplen >>= 8; 301 ret++; 302 } 303 } 304 } 305 if (ret >= INT_MAX - length) 306 return -1; 307 return ret + length; 308 } 309 310 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str) 311 { 312 if (str == NULL) 313 return 0; 314 dst->type = str->type; 315 if (!ASN1_STRING_set(dst, str->data, str->length)) 316 return 0; 317 dst->flags = str->flags; 318 return 1; 319 } 320 321 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str) 322 { 323 ASN1_STRING *ret; 324 if (!str) 325 return NULL; 326 ret = ASN1_STRING_new(); 327 if (!ret) 328 return NULL; 329 if (!ASN1_STRING_copy(ret, str)) { 330 ASN1_STRING_free(ret); 331 return NULL; 332 } 333 return ret; 334 } 335 336 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 337 { 338 unsigned char *c; 339 const char *data = _data; 340 341 if (len < 0) { 342 if (data == NULL) 343 return (0); 344 else 345 len = strlen(data); 346 } 347 if ((str->length <= len) || (str->data == NULL)) { 348 c = str->data; 349 if (c == NULL) 350 str->data = OPENSSL_malloc(len + 1); 351 else 352 str->data = OPENSSL_realloc(c, len + 1); 353 354 if (str->data == NULL) { 355 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 356 str->data = c; 357 return (0); 358 } 359 } 360 str->length = len; 361 if (data != NULL) { 362 OPENSSL_memcpy(str->data, data, len); 363 /* an allowance for strings :-) */ 364 str->data[len] = '\0'; 365 } 366 return (1); 367 } 368 369 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len) 370 { 371 if (str->data) 372 OPENSSL_free(str->data); 373 str->data = data; 374 str->length = len; 375 } 376 377 ASN1_STRING *ASN1_STRING_new(void) 378 { 379 return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 380 } 381 382 ASN1_STRING *ASN1_STRING_type_new(int type) 383 { 384 ASN1_STRING *ret; 385 386 ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); 387 if (ret == NULL) { 388 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 389 return (NULL); 390 } 391 ret->length = 0; 392 ret->type = type; 393 ret->data = NULL; 394 ret->flags = 0; 395 return (ret); 396 } 397 398 void ASN1_STRING_free(ASN1_STRING *a) 399 { 400 if (a == NULL) 401 return; 402 if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) 403 OPENSSL_free(a->data); 404 OPENSSL_free(a); 405 } 406 407 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) 408 { 409 int i; 410 411 i = (a->length - b->length); 412 if (i == 0) { 413 i = OPENSSL_memcmp(a->data, b->data, a->length); 414 if (i == 0) 415 return (a->type - b->type); 416 else 417 return (i); 418 } else 419 return (i); 420 } 421 422 int ASN1_STRING_length(const ASN1_STRING *x) 423 { 424 return M_ASN1_STRING_length(x); 425 } 426 427 void ASN1_STRING_length_set(ASN1_STRING *x, int len) 428 { 429 M_ASN1_STRING_length_set(x, len); 430 return; 431 } 432 433 int ASN1_STRING_type(ASN1_STRING *x) 434 { 435 return M_ASN1_STRING_type(x); 436 } 437 438 unsigned char *ASN1_STRING_data(ASN1_STRING *x) 439 { 440 return M_ASN1_STRING_data(x); 441 } 442 443 const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *x) 444 { 445 return x->data; 446 } 447
