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 } 108 l<<=7L; 109 l|= *(p++)&0x7f; 110 tag=(int)l; 111 } 112 else 113 { 114 tag=i; 115 p++; 116 if (--max == 0) goto err; 117 } 118 *ptag=tag; 119 *pclass=xclass; 120 if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err; 121 122 #if 0 123 fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 124 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength), 125 (int)(omax+ *pp)); 126 127 #endif 128 if (*plength > (omax - (p - *pp))) 129 { 130 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG); 131 /* Set this so that even if things are not long enough 132 * the values are set correctly */ 133 ret|=0x80; 134 } 135 *pp=p; 136 return(ret|inf); 137 err: 138 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG); 139 return(0x80); 140 } 141 142 static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max) 143 { 144 unsigned char *p= *pp; 145 unsigned long ret=0; 146 int i; 147 148 if (max-- < 1) return(0); 149 if (*p == 0x80) 150 { 151 *inf=1; 152 ret=0; 153 p++; 154 } 155 else 156 { 157 *inf=0; 158 i= *p&0x7f; 159 if (*(p++) & 0x80) 160 { 161 if (i > sizeof(long)) 162 return 0; 163 if (max-- == 0) return(0); 164 while (i-- > 0) 165 { 166 ret<<=8L; 167 ret|= *(p++); 168 if (max-- == 0) return(0); 169 } 170 } 171 else 172 ret=i; 173 } 174 if (ret > LONG_MAX) 175 return 0; 176 *pp=p; 177 *rl=(long)ret; 178 return(1); 179 } 180 181 /* class 0 is constructed 182 * constructed == 2 for indefinite length constructed */ 183 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 184 int xclass) 185 { 186 unsigned char *p= *pp; 187 int i, ttag; 188 189 i=(constructed)?V_ASN1_CONSTRUCTED:0; 190 i|=(xclass&V_ASN1_PRIVATE); 191 if (tag < 31) 192 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG); 193 else 194 { 195 *(p++)=i|V_ASN1_PRIMITIVE_TAG; 196 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7; 197 ttag = i; 198 while(i-- > 0) 199 { 200 p[i] = tag & 0x7f; 201 if(i != (ttag - 1)) p[i] |= 0x80; 202 tag >>= 7; 203 } 204 p += ttag; 205 } 206 if ((constructed == 2) && (length == 0)) 207 *(p++)=0x80; /* der_put_length would output 0 instead */ 208 else 209 asn1_put_length(&p,length); 210 *pp=p; 211 } 212 213 static void asn1_put_length(unsigned char **pp, int length) 214 { 215 unsigned char *p= *pp; 216 int i,l; 217 if (length <= 127) 218 *(p++)=(unsigned char)length; 219 else 220 { 221 l=length; 222 for (i=0; l > 0; i++) 223 l>>=8; 224 *(p++)=i|0x80; 225 l=i; 226 while (i-- > 0) 227 { 228 p[i]=length&0xff; 229 length>>=8; 230 } 231 p+=l; 232 } 233 *pp=p; 234 } 235 236 int ASN1_object_size(int constructed, int length, int tag) 237 { 238 int ret; 239 240 ret=length; 241 ret++; 242 if (tag >= 31) 243 { 244 while (tag > 0) 245 { 246 tag>>=7; 247 ret++; 248 } 249 } 250 if ((length == 0) && (constructed == 2)) 251 ret+=2; 252 ret++; 253 if (length > 127) 254 { 255 while (length > 0) 256 { 257 length>>=8; 258 ret++; 259 } 260 } 261 return(ret); 262 } 263 264 int asn1_Finish(ASN1_CTX *c) 265 { 266 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) 267 { 268 if (!ASN1_check_infinite_end(&c->p,c->slen)) 269 { 270 c->error=ERR_R_MISSING_ASN1_EOS; 271 return(0); 272 } 273 } 274 if ( ((c->slen != 0) && !(c->inf & 1)) || 275 ((c->slen < 0) && (c->inf & 1))) 276 { 277 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 278 return(0); 279 } 280 return(1); 281 } 282 283 int asn1_GetSequence(ASN1_CTX *c, long *length) 284 { 285 unsigned char *q; 286 287 q=c->p; 288 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass), 289 *length); 290 if (c->inf & 0x80) 291 { 292 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL; 293 return(0); 294 } 295 if (c->tag != V_ASN1_SEQUENCE) 296 { 297 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE; 298 return(0); 299 } 300 (*length)-=(c->p-q); 301 if (c->max && (*length < 0)) 302 { 303 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 304 return(0); 305 } 306 if (c->inf == (1|V_ASN1_CONSTRUCTED)) 307 c->slen= *length+ *(c->pp)-c->p; 308 c->eos=0; 309 return(1); 310 } 311 312 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str) 313 { 314 ASN1_STRING *ret; 315 316 if (str == NULL) return(NULL); 317 if ((ret=ASN1_STRING_type_new(str->type)) == NULL) 318 return(NULL); 319 if (!ASN1_STRING_set(ret,str->data,str->length)) 320 { 321 ASN1_STRING_free(ret); 322 return(NULL); 323 } 324 ret->flags = str->flags; 325 return(ret); 326 } 327 328 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 329 { 330 unsigned char *c; 331 const char *data=_data; 332 333 if (len < 0) 334 { 335 if (data == NULL) 336 return(0); 337 else 338 len=strlen(data); 339 } 340 if ((str->length < len) || (str->data == NULL)) 341 { 342 c=str->data; 343 if (c == NULL) 344 str->data=OPENSSL_malloc(len+1); 345 else 346 str->data=OPENSSL_realloc(c,len+1); 347 348 if (str->data == NULL) 349 { 350 str->data=c; 351 return(0); 352 } 353 } 354 str->length=len; 355 if (data != NULL) 356 { 357 memcpy(str->data,data,len); 358 /* an allowance for strings :-) */ 359 str->data[len]='\0'; 360 } 361 return(1); 362 } 363 364 ASN1_STRING *ASN1_STRING_new(void) 365 { 366 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 367 } 368 369 370 ASN1_STRING *ASN1_STRING_type_new(int type) 371 { 372 ASN1_STRING *ret; 373 374 ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); 375 if (ret == NULL) 376 { 377 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE); 378 return(NULL); 379 } 380 ret->length=0; 381 ret->type=type; 382 ret->data=NULL; 383 ret->flags=0; 384 return(ret); 385 } 386 387 void ASN1_STRING_free(ASN1_STRING *a) 388 { 389 if (a == NULL) return; 390 if (a->data != NULL) OPENSSL_free(a->data); 391 OPENSSL_free(a); 392 } 393 394 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b) 395 { 396 int i; 397 398 i=(a->length-b->length); 399 if (i == 0) 400 { 401 i=memcmp(a->data,b->data,a->length); 402 if (i == 0) 403 return(a->type-b->type); 404 else 405 return(i); 406 } 407 else 408 return(i); 409 } 410 411 void asn1_add_error(unsigned char *address, int offset) 412 { 413 char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1]; 414 415 snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address); 416 snprintf(buf2,sizeof buf2,"%d",offset); 417 ERR_add_error_data(4,"address=",buf1," offset=",buf2); 418 } 419 420 int ASN1_STRING_length(ASN1_STRING *x) 421 { return M_ASN1_STRING_length(x); } 422 423 void ASN1_STRING_length_set(ASN1_STRING *x, int len) 424 { M_ASN1_STRING_length_set(x, len); return; } 425 426 int ASN1_STRING_type(ASN1_STRING *x) 427 { return M_ASN1_STRING_type(x); } 428 429 unsigned char * ASN1_STRING_data(ASN1_STRING *x) 430 { return M_ASN1_STRING_data(x); } 431