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(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 int ASN1_check_infinite_end(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 84 int ASN1_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass, 85 long omax) 86 { 87 int i,ret; 88 long l; 89 unsigned char *p= *pp; 90 int tag,xclass,inf; 91 long max=omax; 92 93 if (!max) goto err; 94 ret=(*p&V_ASN1_CONSTRUCTED); 95 xclass=(*p&V_ASN1_PRIVATE); 96 i= *p&V_ASN1_PRIMITIVE_TAG; 97 if (i == V_ASN1_PRIMITIVE_TAG) 98 { /* high-tag */ 99 p++; 100 if (--max == 0) goto err; 101 l=0; 102 while (*p&0x80) 103 { 104 l<<=7L; 105 l|= *(p++)&0x7f; 106 if (--max == 0) goto err; 107 if (l > (INT_MAX >> 7L)) goto err; 108 } 109 l<<=7L; 110 l|= *(p++)&0x7f; 111 tag=(int)l; 112 if (--max == 0) goto err; 113 } 114 else 115 { 116 tag=i; 117 p++; 118 if (--max == 0) goto err; 119 } 120 *ptag=tag; 121 *pclass=xclass; 122 if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err; 123 124 #if 0 125 fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 126 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength), 127 (int)(omax+ *pp)); 128 129 #endif 130 if (*plength > (omax - (p - *pp))) 131 { 132 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG); 133 /* Set this so that even if things are not long enough 134 * the values are set correctly */ 135 ret|=0x80; 136 } 137 *pp=p; 138 return(ret|inf); 139 err: 140 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG); 141 return(0x80); 142 } 143 144 static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max) 145 { 146 unsigned char *p= *pp; 147 unsigned long ret=0; 148 int i; 149 150 if (max-- < 1) return(0); 151 if (*p == 0x80) 152 { 153 *inf=1; 154 ret=0; 155 p++; 156 } 157 else 158 { 159 *inf=0; 160 i= *p&0x7f; 161 if (*(p++) & 0x80) 162 { 163 if (i > sizeof(long)) 164 return 0; 165 if (max-- == 0) return(0); 166 while (i-- > 0) 167 { 168 ret<<=8L; 169 ret|= *(p++); 170 if (max-- == 0) return(0); 171 } 172 } 173 else 174 ret=i; 175 } 176 if (ret > LONG_MAX) 177 return 0; 178 *pp=p; 179 *rl=(long)ret; 180 return(1); 181 } 182 183 /* class 0 is constructed 184 * constructed == 2 for indefinite length constructed */ 185 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 186 int xclass) 187 { 188 unsigned char *p= *pp; 189 int i, ttag; 190 191 i=(constructed)?V_ASN1_CONSTRUCTED:0; 192 i|=(xclass&V_ASN1_PRIVATE); 193 if (tag < 31) 194 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG); 195 else 196 { 197 *(p++)=i|V_ASN1_PRIMITIVE_TAG; 198 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7; 199 ttag = i; 200 while(i-- > 0) 201 { 202 p[i] = tag & 0x7f; 203 if(i != (ttag - 1)) p[i] |= 0x80; 204 tag >>= 7; 205 } 206 p += ttag; 207 } 208 if ((constructed == 2) && (length == 0)) 209 *(p++)=0x80; /* der_put_length would output 0 instead */ 210 else 211 asn1_put_length(&p,length); 212 *pp=p; 213 } 214 215 static void asn1_put_length(unsigned char **pp, int length) 216 { 217 unsigned char *p= *pp; 218 int i,l; 219 if (length <= 127) 220 *(p++)=(unsigned char)length; 221 else 222 { 223 l=length; 224 for (i=0; l > 0; i++) 225 l>>=8; 226 *(p++)=i|0x80; 227 l=i; 228 while (i-- > 0) 229 { 230 p[i]=length&0xff; 231 length>>=8; 232 } 233 p+=l; 234 } 235 *pp=p; 236 } 237 238 int ASN1_object_size(int constructed, int length, int tag) 239 { 240 int ret; 241 242 ret=length; 243 ret++; 244 if (tag >= 31) 245 { 246 while (tag > 0) 247 { 248 tag>>=7; 249 ret++; 250 } 251 } 252 if ((length == 0) && (constructed == 2)) 253 ret+=2; 254 ret++; 255 if (length > 127) 256 { 257 while (length > 0) 258 { 259 length>>=8; 260 ret++; 261 } 262 } 263 return(ret); 264 } 265 266 int asn1_Finish(ASN1_CTX *c) 267 { 268 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) 269 { 270 if (!ASN1_check_infinite_end(&c->p,c->slen)) 271 { 272 c->error=ERR_R_MISSING_ASN1_EOS; 273 return(0); 274 } 275 } 276 if ( ((c->slen != 0) && !(c->inf & 1)) || 277 ((c->slen < 0) && (c->inf & 1))) 278 { 279 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 280 return(0); 281 } 282 return(1); 283 } 284 285 int asn1_GetSequence(ASN1_CTX *c, long *length) 286 { 287 unsigned char *q; 288 289 q=c->p; 290 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass), 291 *length); 292 if (c->inf & 0x80) 293 { 294 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL; 295 return(0); 296 } 297 if (c->tag != V_ASN1_SEQUENCE) 298 { 299 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE; 300 return(0); 301 } 302 (*length)-=(c->p-q); 303 if (c->max && (*length < 0)) 304 { 305 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 306 return(0); 307 } 308 if (c->inf == (1|V_ASN1_CONSTRUCTED)) 309 c->slen= *length+ *(c->pp)-c->p; 310 c->eos=0; 311 return(1); 312 } 313 314 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str) 315 { 316 ASN1_STRING *ret; 317 318 if (str == NULL) return(NULL); 319 if ((ret=ASN1_STRING_type_new(str->type)) == NULL) 320 return(NULL); 321 if (!ASN1_STRING_set(ret,str->data,str->length)) 322 { 323 ASN1_STRING_free(ret); 324 return(NULL); 325 } 326 ret->flags = str->flags; 327 return(ret); 328 } 329 330 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 331 { 332 unsigned char *c; 333 const char *data=_data; 334 335 if (len < 0) 336 { 337 if (data == NULL) 338 return(0); 339 else 340 len=strlen(data); 341 } 342 if ((str->length < len) || (str->data == NULL)) 343 { 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 { 352 str->data=c; 353 return(0); 354 } 355 } 356 str->length=len; 357 if (data != NULL) 358 { 359 memcpy(str->data,data,len); 360 /* an allowance for strings :-) */ 361 str->data[len]='\0'; 362 } 363 return(1); 364 } 365 366 ASN1_STRING *ASN1_STRING_new(void) 367 { 368 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 369 } 370 371 372 ASN1_STRING *ASN1_STRING_type_new(int type) 373 { 374 ASN1_STRING *ret; 375 376 ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); 377 if (ret == NULL) 378 { 379 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE); 380 return(NULL); 381 } 382 ret->length=0; 383 ret->type=type; 384 ret->data=NULL; 385 ret->flags=0; 386 return(ret); 387 } 388 389 void ASN1_STRING_free(ASN1_STRING *a) 390 { 391 if (a == NULL) return; 392 if (a->data != NULL) OPENSSL_free(a->data); 393 OPENSSL_free(a); 394 } 395 396 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b) 397 { 398 int i; 399 400 i=(a->length-b->length); 401 if (i == 0) 402 { 403 i=memcmp(a->data,b->data,a->length); 404 if (i == 0) 405 return(a->type-b->type); 406 else 407 return(i); 408 } 409 else 410 return(i); 411 } 412 413 void asn1_add_error(unsigned char *address, int offset) 414 { 415 char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1]; 416 417 BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address); 418 BIO_snprintf(buf2,sizeof buf2,"%d",offset); 419 ERR_add_error_data(4,"address=",buf1," offset=",buf2); 420 } 421 422 int ASN1_STRING_length(ASN1_STRING *x) 423 { return M_ASN1_STRING_length(x); } 424 425 void ASN1_STRING_length_set(ASN1_STRING *x, int len) 426 { M_ASN1_STRING_length_set(x, len); return; } 427 428 int ASN1_STRING_type(ASN1_STRING *x) 429 { return M_ASN1_STRING_type(x); } 430 431 unsigned char * ASN1_STRING_data(ASN1_STRING *x) 432 { return M_ASN1_STRING_data(x); } 433