1 /* crypto/asn1/asn1_lib.c */ 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 <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 0 135 fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 136 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength), 137 (int)(omax+ *pp)); 138 139 #endif 140 if (*plength > (omax - (p - *pp))) 141 { 142 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG); 143 /* Set this so that even if things are not long enough 144 * the values are set correctly */ 145 ret|=0x80; 146 } 147 *pp=p; 148 return(ret|inf); 149 err: 150 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG); 151 return(0x80); 152 } 153 154 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max) 155 { 156 const unsigned char *p= *pp; 157 unsigned long ret=0; 158 unsigned int i; 159 160 if (max-- < 1) return(0); 161 if (*p == 0x80) 162 { 163 *inf=1; 164 ret=0; 165 p++; 166 } 167 else 168 { 169 *inf=0; 170 i= *p&0x7f; 171 if (*(p++) & 0x80) 172 { 173 if (i > sizeof(long)) 174 return 0; 175 if (max-- == 0) return(0); 176 while (i-- > 0) 177 { 178 ret<<=8L; 179 ret|= *(p++); 180 if (max-- == 0) return(0); 181 } 182 } 183 else 184 ret=i; 185 } 186 if (ret > LONG_MAX) 187 return 0; 188 *pp=p; 189 *rl=(long)ret; 190 return(1); 191 } 192 193 /* class 0 is constructed 194 * constructed == 2 for indefinite length constructed */ 195 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 196 int xclass) 197 { 198 unsigned char *p= *pp; 199 int i, ttag; 200 201 i=(constructed)?V_ASN1_CONSTRUCTED:0; 202 i|=(xclass&V_ASN1_PRIVATE); 203 if (tag < 31) 204 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG); 205 else 206 { 207 *(p++)=i|V_ASN1_PRIMITIVE_TAG; 208 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7; 209 ttag = i; 210 while(i-- > 0) 211 { 212 p[i] = tag & 0x7f; 213 if(i != (ttag - 1)) p[i] |= 0x80; 214 tag >>= 7; 215 } 216 p += ttag; 217 } 218 if (constructed == 2) 219 *(p++)=0x80; 220 else 221 asn1_put_length(&p,length); 222 *pp=p; 223 } 224 225 int ASN1_put_eoc(unsigned char **pp) 226 { 227 unsigned char *p = *pp; 228 *p++ = 0; 229 *p++ = 0; 230 *pp = p; 231 return 2; 232 } 233 234 static void asn1_put_length(unsigned char **pp, int length) 235 { 236 unsigned char *p= *pp; 237 int i,l; 238 if (length <= 127) 239 *(p++)=(unsigned char)length; 240 else 241 { 242 l=length; 243 for (i=0; l > 0; i++) 244 l>>=8; 245 *(p++)=i|0x80; 246 l=i; 247 while (i-- > 0) 248 { 249 p[i]=length&0xff; 250 length>>=8; 251 } 252 p+=l; 253 } 254 *pp=p; 255 } 256 257 int ASN1_object_size(int constructed, int length, int tag) 258 { 259 int ret; 260 261 ret=length; 262 ret++; 263 if (tag >= 31) 264 { 265 while (tag > 0) 266 { 267 tag>>=7; 268 ret++; 269 } 270 } 271 if (constructed == 2) 272 return ret + 3; 273 ret++; 274 if (length > 127) 275 { 276 while (length > 0) 277 { 278 length>>=8; 279 ret++; 280 } 281 } 282 return(ret); 283 } 284 285 static int _asn1_Finish(ASN1_const_CTX *c) 286 { 287 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) 288 { 289 if (!ASN1_const_check_infinite_end(&c->p,c->slen)) 290 { 291 c->error=ERR_R_MISSING_ASN1_EOS; 292 return(0); 293 } 294 } 295 if ( ((c->slen != 0) && !(c->inf & 1)) || 296 ((c->slen < 0) && (c->inf & 1))) 297 { 298 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 299 return(0); 300 } 301 return(1); 302 } 303 304 int asn1_Finish(ASN1_CTX *c) 305 { 306 return _asn1_Finish((ASN1_const_CTX *)c); 307 } 308 309 int asn1_const_Finish(ASN1_const_CTX *c) 310 { 311 return _asn1_Finish(c); 312 } 313 314 int asn1_GetSequence(ASN1_const_CTX *c, long *length) 315 { 316 const unsigned char *q; 317 318 q=c->p; 319 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass), 320 *length); 321 if (c->inf & 0x80) 322 { 323 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL; 324 return(0); 325 } 326 if (c->tag != V_ASN1_SEQUENCE) 327 { 328 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE; 329 return(0); 330 } 331 (*length)-=(c->p-q); 332 if (c->max && (*length < 0)) 333 { 334 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 335 return(0); 336 } 337 if (c->inf == (1|V_ASN1_CONSTRUCTED)) 338 c->slen= *length+ *(c->pp)-c->p; 339 c->eos=0; 340 return(1); 341 } 342 343 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str) 344 { 345 ASN1_STRING *ret; 346 347 if (str == NULL) return(NULL); 348 if ((ret=ASN1_STRING_type_new(str->type)) == NULL) 349 return(NULL); 350 if (!ASN1_STRING_set(ret,str->data,str->length)) 351 { 352 ASN1_STRING_free(ret); 353 return(NULL); 354 } 355 ret->flags = str->flags; 356 return(ret); 357 } 358 359 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 360 { 361 unsigned char *c; 362 const char *data=_data; 363 364 if (len < 0) 365 { 366 if (data == NULL) 367 return(0); 368 else 369 len=strlen(data); 370 } 371 if ((str->length < len) || (str->data == NULL)) 372 { 373 c=str->data; 374 if (c == NULL) 375 str->data=OPENSSL_malloc(len+1); 376 else 377 str->data=OPENSSL_realloc(c,len+1); 378 379 if (str->data == NULL) 380 { 381 ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE); 382 str->data=c; 383 return(0); 384 } 385 } 386 str->length=len; 387 if (data != NULL) 388 { 389 memcpy(str->data,data,len); 390 /* an allowance for strings :-) */ 391 str->data[len]='\0'; 392 } 393 return(1); 394 } 395 396 ASN1_STRING *ASN1_STRING_new(void) 397 { 398 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 399 } 400 401 402 ASN1_STRING *ASN1_STRING_type_new(int type) 403 { 404 ASN1_STRING *ret; 405 406 ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); 407 if (ret == NULL) 408 { 409 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE); 410 return(NULL); 411 } 412 ret->length=0; 413 ret->type=type; 414 ret->data=NULL; 415 ret->flags=0; 416 return(ret); 417 } 418 419 void ASN1_STRING_free(ASN1_STRING *a) 420 { 421 if (a == NULL) return; 422 if (a->data != NULL) OPENSSL_free(a->data); 423 OPENSSL_free(a); 424 } 425 426 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b) 427 { 428 int i; 429 430 i=(a->length-b->length); 431 if (i == 0) 432 { 433 i=memcmp(a->data,b->data,a->length); 434 if (i == 0) 435 return(a->type-b->type); 436 else 437 return(i); 438 } 439 else 440 return(i); 441 } 442 443 void asn1_add_error(const unsigned char *address, int offset) 444 { 445 char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1]; 446 447 BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address); 448 BIO_snprintf(buf2,sizeof buf2,"%d",offset); 449 ERR_add_error_data(4,"address=",buf1," offset=",buf2); 450 } 451 452 int ASN1_STRING_length(ASN1_STRING *x) 453 { return M_ASN1_STRING_length(x); } 454 455 void ASN1_STRING_length_set(ASN1_STRING *x, int len) 456 { M_ASN1_STRING_length_set(x, len); return; } 457 458 int ASN1_STRING_type(ASN1_STRING *x) 459 { return M_ASN1_STRING_type(x); } 460 461 unsigned char * ASN1_STRING_data(ASN1_STRING *x) 462 { return M_ASN1_STRING_data(x); } 463