1 /* crypto/asn1/asn1_lib.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 65 static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max); 66 static void asn1_put_length(unsigned char **pp, int length); 67 const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT; 68 69 static int _asn1_check_infinite_end(const unsigned char **p, long len) 70 { 71 /* If there is 0 or 1 byte left, the length check should pick 72 * things up */ 73 if (len <= 0) 74 return(1); 75 else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) 76 { 77 (*p)+=2; 78 return(1); 79 } 80 return(0); 81 } 82 83 int ASN1_check_infinite_end(unsigned char **p, long len) 84 { 85 return _asn1_check_infinite_end((const unsigned char **)p, len); 86 } 87 88 int ASN1_const_check_infinite_end(const unsigned char **p, long len) 89 { 90 return _asn1_check_infinite_end(p, len); 91 } 92 93 94 int 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) goto err; 104 ret=(*p&V_ASN1_CONSTRUCTED); 105 xclass=(*p&V_ASN1_PRIVATE); 106 i= *p&V_ASN1_PRIMITIVE_TAG; 107 if (i == V_ASN1_PRIMITIVE_TAG) 108 { /* high-tag */ 109 p++; 110 if (--max == 0) goto err; 111 l=0; 112 while (*p&0x80) 113 { 114 l<<=7L; 115 l|= *(p++)&0x7f; 116 if (--max == 0) goto err; 117 if (l > (INT_MAX >> 7L)) goto err; 118 } 119 l<<=7L; 120 l|= *(p++)&0x7f; 121 tag=(int)l; 122 if (--max == 0) goto err; 123 } 124 else 125 { 126 tag=i; 127 p++; 128 if (--max == 0) goto err; 129 } 130 *ptag=tag; 131 *pclass=xclass; 132 if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err; 133 134 if (inf && !(ret & V_ASN1_CONSTRUCTED)) 135 goto err; 136 137 #if 0 138 fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 139 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength), 140 (int)(omax+ *pp)); 141 142 #endif 143 if (*plength > (omax - (p - *pp))) 144 { 145 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG); 146 /* Set this so that even if things are not long enough 147 * the values are set correctly */ 148 ret|=0x80; 149 } 150 *pp=p; 151 return(ret|inf); 152 err: 153 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG); 154 return(0x80); 155 } 156 157 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max) 158 { 159 const unsigned char *p= *pp; 160 unsigned long ret=0; 161 unsigned int i; 162 163 if (max-- < 1) return(0); 164 if (*p == 0x80) 165 { 166 *inf=1; 167 ret=0; 168 p++; 169 } 170 else 171 { 172 *inf=0; 173 i= *p&0x7f; 174 if (*(p++) & 0x80) 175 { 176 if (i > sizeof(long)) 177 return 0; 178 if (max-- == 0) return(0); 179 while (i-- > 0) 180 { 181 ret<<=8L; 182 ret|= *(p++); 183 if (max-- == 0) return(0); 184 } 185 } 186 else 187 ret=i; 188 } 189 if (ret > LONG_MAX) 190 return 0; 191 *pp=p; 192 *rl=(long)ret; 193 return(1); 194 } 195 196 /* class 0 is constructed 197 * constructed == 2 for indefinite length constructed */ 198 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 199 int xclass) 200 { 201 unsigned char *p= *pp; 202 int i, ttag; 203 204 i=(constructed)?V_ASN1_CONSTRUCTED:0; 205 i|=(xclass&V_ASN1_PRIVATE); 206 if (tag < 31) 207 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG); 208 else 209 { 210 *(p++)=i|V_ASN1_PRIMITIVE_TAG; 211 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7; 212 ttag = i; 213 while(i-- > 0) 214 { 215 p[i] = tag & 0x7f; 216 if(i != (ttag - 1)) p[i] |= 0x80; 217 tag >>= 7; 218 } 219 p += ttag; 220 } 221 if (constructed == 2) 222 *(p++)=0x80; 223 else 224 asn1_put_length(&p,length); 225 *pp=p; 226 } 227 228 int ASN1_put_eoc(unsigned char **pp) 229 { 230 unsigned char *p = *pp; 231 *p++ = 0; 232 *p++ = 0; 233 *pp = p; 234 return 2; 235 } 236 237 static void asn1_put_length(unsigned char **pp, int length) 238 { 239 unsigned char *p= *pp; 240 int i,l; 241 if (length <= 127) 242 *(p++)=(unsigned char)length; 243 else 244 { 245 l=length; 246 for (i=0; l > 0; i++) 247 l>>=8; 248 *(p++)=i|0x80; 249 l=i; 250 while (i-- > 0) 251 { 252 p[i]=length&0xff; 253 length>>=8; 254 } 255 p+=l; 256 } 257 *pp=p; 258 } 259 260 int ASN1_object_size(int constructed, int length, int tag) 261 { 262 int ret; 263 264 ret=length; 265 ret++; 266 if (tag >= 31) 267 { 268 while (tag > 0) 269 { 270 tag>>=7; 271 ret++; 272 } 273 } 274 if (constructed == 2) 275 return ret + 3; 276 ret++; 277 if (length > 127) 278 { 279 while (length > 0) 280 { 281 length>>=8; 282 ret++; 283 } 284 } 285 return(ret); 286 } 287 288 static int _asn1_Finish(ASN1_const_CTX *c) 289 { 290 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) 291 { 292 if (!ASN1_const_check_infinite_end(&c->p,c->slen)) 293 { 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 { 301 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 302 return(0); 303 } 304 return(1); 305 } 306 307 int asn1_Finish(ASN1_CTX *c) 308 { 309 return _asn1_Finish((ASN1_const_CTX *)c); 310 } 311 312 int asn1_const_Finish(ASN1_const_CTX *c) 313 { 314 return _asn1_Finish(c); 315 } 316 317 int asn1_GetSequence(ASN1_const_CTX *c, long *length) 318 { 319 const unsigned char *q; 320 321 q=c->p; 322 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass), 323 *length); 324 if (c->inf & 0x80) 325 { 326 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL; 327 return(0); 328 } 329 if (c->tag != V_ASN1_SEQUENCE) 330 { 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 { 337 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 338 return(0); 339 } 340 if (c->inf == (1|V_ASN1_CONSTRUCTED)) 341 c->slen= *length+ *(c->pp)-c->p; 342 c->eos=0; 343 return(1); 344 } 345 346 int 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 *ASN1_STRING_dup(const ASN1_STRING *str) 358 { 359 ASN1_STRING *ret; 360 if (!str) 361 return NULL; 362 ret=ASN1_STRING_new(); 363 if (!ret) 364 return NULL; 365 if (!ASN1_STRING_copy(ret,str)) 366 { 367 ASN1_STRING_free(ret); 368 return NULL; 369 } 370 return ret; 371 } 372 373 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 374 { 375 unsigned char *c; 376 const char *data=_data; 377 378 if (len < 0) 379 { 380 if (data == NULL) 381 return(0); 382 else 383 len=strlen(data); 384 } 385 if ((str->length < len) || (str->data == NULL)) 386 { 387 c=str->data; 388 if (c == NULL) 389 str->data=OPENSSL_malloc(len+1); 390 else 391 str->data=OPENSSL_realloc(c,len+1); 392 393 if (str->data == NULL) 394 { 395 ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE); 396 str->data=c; 397 return(0); 398 } 399 } 400 str->length=len; 401 if (data != NULL) 402 { 403 memcpy(str->data,data,len); 404 /* an allowance for strings :-) */ 405 str->data[len]='\0'; 406 } 407 return(1); 408 } 409 410 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len) 411 { 412 if (str->data) 413 OPENSSL_free(str->data); 414 str->data = data; 415 str->length = len; 416 } 417 418 ASN1_STRING *ASN1_STRING_new(void) 419 { 420 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 421 } 422 423 424 ASN1_STRING *ASN1_STRING_type_new(int type) 425 { 426 ASN1_STRING *ret; 427 428 ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); 429 if (ret == NULL) 430 { 431 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE); 432 return(NULL); 433 } 434 ret->length=0; 435 ret->type=type; 436 ret->data=NULL; 437 ret->flags=0; 438 return(ret); 439 } 440 441 void ASN1_STRING_free(ASN1_STRING *a) 442 { 443 if (a == NULL) return; 444 if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) 445 OPENSSL_free(a->data); 446 OPENSSL_free(a); 447 } 448 449 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) 450 { 451 int i; 452 453 i=(a->length-b->length); 454 if (i == 0) 455 { 456 i=memcmp(a->data,b->data,a->length); 457 if (i == 0) 458 return(a->type-b->type); 459 else 460 return(i); 461 } 462 else 463 return(i); 464 } 465 466 void asn1_add_error(const unsigned char *address, int offset) 467 { 468 char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1]; 469 470 BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address); 471 BIO_snprintf(buf2,sizeof buf2,"%d",offset); 472 ERR_add_error_data(4,"address=",buf1," offset=",buf2); 473 } 474 475 int ASN1_STRING_length(const ASN1_STRING *x) 476 { return M_ASN1_STRING_length(x); } 477 478 void ASN1_STRING_length_set(ASN1_STRING *x, int len) 479 { M_ASN1_STRING_length_set(x, len); return; } 480 481 int ASN1_STRING_type(ASN1_STRING *x) 482 { return M_ASN1_STRING_type(x); } 483 484 unsigned char * ASN1_STRING_data(ASN1_STRING *x) 485 { return M_ASN1_STRING_data(x); } 486
