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 if (ret > LONG_MAX) 209 return 0; 210 *pp = p; 211 *rl = (long)ret; 212 return 1; 213 } 214 215 /* 216 * class 0 is constructed constructed == 2 for indefinite length constructed 217 */ 218 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 219 int xclass) 220 { 221 unsigned char *p = *pp; 222 int i, ttag; 223 224 i = (constructed) ? V_ASN1_CONSTRUCTED : 0; 225 i |= (xclass & V_ASN1_PRIVATE); 226 if (tag < 31) 227 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG); 228 else { 229 *(p++) = i | V_ASN1_PRIMITIVE_TAG; 230 for (i = 0, ttag = tag; ttag > 0; i++) 231 ttag >>= 7; 232 ttag = i; 233 while (i-- > 0) { 234 p[i] = tag & 0x7f; 235 if (i != (ttag - 1)) 236 p[i] |= 0x80; 237 tag >>= 7; 238 } 239 p += ttag; 240 } 241 if (constructed == 2) 242 *(p++) = 0x80; 243 else 244 asn1_put_length(&p, length); 245 *pp = p; 246 } 247 248 int ASN1_put_eoc(unsigned char **pp) 249 { 250 unsigned char *p = *pp; 251 *p++ = 0; 252 *p++ = 0; 253 *pp = p; 254 return 2; 255 } 256 257 static void asn1_put_length(unsigned char **pp, int length) 258 { 259 unsigned char *p = *pp; 260 int i, l; 261 if (length <= 127) 262 *(p++) = (unsigned char)length; 263 else { 264 l = length; 265 for (i = 0; l > 0; i++) 266 l >>= 8; 267 *(p++) = i | 0x80; 268 l = i; 269 while (i-- > 0) { 270 p[i] = length & 0xff; 271 length >>= 8; 272 } 273 p += l; 274 } 275 *pp = p; 276 } 277 278 int ASN1_object_size(int constructed, int length, int tag) 279 { 280 int ret = 1; 281 if (length < 0) 282 return -1; 283 if (tag >= 31) { 284 while (tag > 0) { 285 tag >>= 7; 286 ret++; 287 } 288 } 289 if (constructed == 2) { 290 ret += 3; 291 } else { 292 ret++; 293 if (length > 127) { 294 int tmplen = length; 295 while (tmplen > 0) { 296 tmplen >>= 8; 297 ret++; 298 } 299 } 300 } 301 if (ret >= INT_MAX - length) 302 return -1; 303 return ret + length; 304 } 305 306 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str) 307 { 308 if (str == NULL) 309 return 0; 310 dst->type = str->type; 311 if (!ASN1_STRING_set(dst, str->data, str->length)) 312 return 0; 313 dst->flags = str->flags; 314 return 1; 315 } 316 317 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str) 318 { 319 ASN1_STRING *ret; 320 if (!str) 321 return NULL; 322 ret = ASN1_STRING_new(); 323 if (!ret) 324 return NULL; 325 if (!ASN1_STRING_copy(ret, str)) { 326 ASN1_STRING_free(ret); 327 return NULL; 328 } 329 return ret; 330 } 331 332 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 333 { 334 unsigned char *c; 335 const char *data = _data; 336 337 if (len < 0) { 338 if (data == NULL) 339 return (0); 340 else 341 len = strlen(data); 342 } 343 if ((str->length <= len) || (str->data == NULL)) { 344 c = str->data; 345 if (c == NULL) 346 str->data = OPENSSL_malloc(len + 1); 347 else 348 str->data = OPENSSL_realloc(c, len + 1); 349 350 if (str->data == NULL) { 351 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 352 str->data = c; 353 return (0); 354 } 355 } 356 str->length = len; 357 if (data != NULL) { 358 OPENSSL_memcpy(str->data, data, len); 359 /* an allowance for strings :-) */ 360 str->data[len] = '\0'; 361 } 362 return (1); 363 } 364 365 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len) 366 { 367 if (str->data) 368 OPENSSL_free(str->data); 369 str->data = data; 370 str->length = len; 371 } 372 373 ASN1_STRING *ASN1_STRING_new(void) 374 { 375 return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 376 } 377 378 ASN1_STRING *ASN1_STRING_type_new(int type) 379 { 380 ASN1_STRING *ret; 381 382 ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); 383 if (ret == NULL) { 384 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 385 return (NULL); 386 } 387 ret->length = 0; 388 ret->type = type; 389 ret->data = NULL; 390 ret->flags = 0; 391 return (ret); 392 } 393 394 void ASN1_STRING_free(ASN1_STRING *a) 395 { 396 if (a == NULL) 397 return; 398 if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) 399 OPENSSL_free(a->data); 400 OPENSSL_free(a); 401 } 402 403 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) 404 { 405 int i; 406 407 i = (a->length - b->length); 408 if (i == 0) { 409 i = OPENSSL_memcmp(a->data, b->data, a->length); 410 if (i == 0) 411 return (a->type - b->type); 412 else 413 return (i); 414 } else 415 return (i); 416 } 417 418 int ASN1_STRING_length(const ASN1_STRING *x) 419 { 420 return M_ASN1_STRING_length(x); 421 } 422 423 void ASN1_STRING_length_set(ASN1_STRING *x, int len) 424 { 425 M_ASN1_STRING_length_set(x, len); 426 return; 427 } 428 429 int ASN1_STRING_type(ASN1_STRING *x) 430 { 431 return M_ASN1_STRING_type(x); 432 } 433 434 unsigned char *ASN1_STRING_data(ASN1_STRING *x) 435 { 436 return M_ASN1_STRING_data(x); 437 } 438 439 const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *x) 440 { 441 return x->data; 442 } 443
