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 "cryptlib.h" 61 #include <openssl/asn1.h> 62 63 static int asn1_get_length(unsigned char **pp,int *inf,long *rl,int max); 64 static void asn1_put_length(unsigned char **pp, int length); 65 const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT; 66 67 int ASN1_check_infinite_end(unsigned char **p, long len) 68 { 69 /* If there is 0 or 1 byte left, the length check should pick 70 * things up */ 71 if (len <= 0) 72 return(1); 73 else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) 74 { 75 (*p)+=2; 76 return(1); 77 } 78 return(0); 79 } 80 81 82 int ASN1_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass, 83 long omax) 84 { 85 int i,ret; 86 long l; 87 unsigned char *p= *pp; 88 int tag,xclass,inf; 89 long max=omax; 90 91 if (!max) goto err; 92 ret=(*p&V_ASN1_CONSTRUCTED); 93 xclass=(*p&V_ASN1_PRIVATE); 94 i= *p&V_ASN1_PRIMITIVE_TAG; 95 if (i == V_ASN1_PRIMITIVE_TAG) 96 { /* high-tag */ 97 p++; 98 if (--max == 0) goto err; 99 l=0; 100 while (*p&0x80) 101 { 102 l<<=7L; 103 l|= *(p++)&0x7f; 104 if (--max == 0) goto err; 105 } 106 l<<=7L; 107 l|= *(p++)&0x7f; 108 tag=(int)l; 109 } 110 else 111 { 112 tag=i; 113 p++; 114 if (--max == 0) goto err; 115 } 116 *ptag=tag; 117 *pclass=xclass; 118 if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err; 119 120 #if 0 121 fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 122 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength), 123 (int)(omax+ *pp)); 124 125 #endif 126 if (*plength > (omax - (*pp - p))) 127 { 128 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG); 129 /* Set this so that even if things are not long enough 130 * the values are set correctly */ 131 ret|=0x80; 132 } 133 *pp=p; 134 return(ret|inf); 135 err: 136 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG); 137 return(0x80); 138 } 139 140 static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max) 141 { 142 unsigned char *p= *pp; 143 long ret=0; 144 int i; 145 146 if (max-- < 1) return(0); 147 if (*p == 0x80) 148 { 149 *inf=1; 150 ret=0; 151 p++; 152 } 153 else 154 { 155 *inf=0; 156 i= *p&0x7f; 157 if (*(p++) & 0x80) 158 { 159 if (i > sizeof(long)) 160 return 0; 161 if (max-- == 0) return(0); 162 while (i-- > 0) 163 { 164 ret<<=8L; 165 ret|= *(p++); 166 if (max-- == 0) return(0); 167 } 168 } 169 else 170 ret=i; 171 } 172 if (ret < 0) 173 return 0; 174 *pp=p; 175 *rl=ret; 176 return(1); 177 } 178 179 /* class 0 is constructed 180 * constructed == 2 for indefinite length constructed */ 181 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 182 int xclass) 183 { 184 unsigned char *p= *pp; 185 int i, ttag; 186 187 i=(constructed)?V_ASN1_CONSTRUCTED:0; 188 i|=(xclass&V_ASN1_PRIVATE); 189 if (tag < 31) 190 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG); 191 else 192 { 193 *(p++)=i|V_ASN1_PRIMITIVE_TAG; 194 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7; 195 ttag = i; 196 while(i-- > 0) 197 { 198 p[i] = tag & 0x7f; 199 if(i != (ttag - 1)) p[i] |= 0x80; 200 tag >>= 7; 201 } 202 p += ttag; 203 } 204 if ((constructed == 2) && (length == 0)) 205 *(p++)=0x80; /* der_put_length would output 0 instead */ 206 else 207 asn1_put_length(&p,length); 208 *pp=p; 209 } 210 211 static void asn1_put_length(unsigned char **pp, int length) 212 { 213 unsigned char *p= *pp; 214 int i,l; 215 if (length <= 127) 216 *(p++)=(unsigned char)length; 217 else 218 { 219 l=length; 220 for (i=0; l > 0; i++) 221 l>>=8; 222 *(p++)=i|0x80; 223 l=i; 224 while (i-- > 0) 225 { 226 p[i]=length&0xff; 227 length>>=8; 228 } 229 p+=l; 230 } 231 *pp=p; 232 } 233 234 int ASN1_object_size(int constructed, int length, int tag) 235 { 236 int ret; 237 238 ret=length; 239 ret++; 240 if (tag >= 31) 241 { 242 while (tag > 0) 243 { 244 tag>>=7; 245 ret++; 246 } 247 } 248 if ((length == 0) && (constructed == 2)) 249 ret+=2; 250 ret++; 251 if (length > 127) 252 { 253 while (length > 0) 254 { 255 length>>=8; 256 ret++; 257 } 258 } 259 return(ret); 260 } 261 262 int asn1_Finish(ASN1_CTX *c) 263 { 264 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) 265 { 266 if (!ASN1_check_infinite_end(&c->p,c->slen)) 267 { 268 c->error=ERR_R_MISSING_ASN1_EOS; 269 return(0); 270 } 271 } 272 if ( ((c->slen != 0) && !(c->inf & 1)) || 273 ((c->slen < 0) && (c->inf & 1))) 274 { 275 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 276 return(0); 277 } 278 return(1); 279 } 280 281 int asn1_GetSequence(ASN1_CTX *c, long *length) 282 { 283 unsigned char *q; 284 285 q=c->p; 286 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass), 287 *length); 288 if (c->inf & 0x80) 289 { 290 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL; 291 return(0); 292 } 293 if (c->tag != V_ASN1_SEQUENCE) 294 { 295 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE; 296 return(0); 297 } 298 (*length)-=(c->p-q); 299 if (c->max && (*length < 0)) 300 { 301 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 302 return(0); 303 } 304 if (c->inf == (1|V_ASN1_CONSTRUCTED)) 305 c->slen= *length+ *(c->pp)-c->p; 306 c->eos=0; 307 return(1); 308 } 309 310 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str) 311 { 312 ASN1_STRING *ret; 313 314 if (str == NULL) return(NULL); 315 if ((ret=ASN1_STRING_type_new(str->type)) == NULL) 316 return(NULL); 317 if (!ASN1_STRING_set(ret,str->data,str->length)) 318 { 319 ASN1_STRING_free(ret); 320 return(NULL); 321 } 322 ret->flags = str->flags; 323 return(ret); 324 } 325 326 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 327 { 328 unsigned char *c; 329 const char *data=_data; 330 331 if (len < 0) 332 { 333 if (data == NULL) 334 return(0); 335 else 336 len=strlen(data); 337 } 338 if ((str->length < len) || (str->data == NULL)) 339 { 340 c=str->data; 341 if (c == NULL) 342 str->data=OPENSSL_malloc(len+1); 343 else 344 str->data=OPENSSL_realloc(c,len+1); 345 346 if (str->data == NULL) 347 { 348 str->data=c; 349 return(0); 350 } 351 } 352 str->length=len; 353 if (data != NULL) 354 { 355 memcpy(str->data,data,len); 356 /* an allowance for strings :-) */ 357 str->data[len]='\0'; 358 } 359 return(1); 360 } 361 362 ASN1_STRING *ASN1_STRING_new(void) 363 { 364 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 365 } 366 367 368 ASN1_STRING *ASN1_STRING_type_new(int type) 369 { 370 ASN1_STRING *ret; 371 372 ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); 373 if (ret == NULL) 374 { 375 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE); 376 return(NULL); 377 } 378 ret->length=0; 379 ret->type=type; 380 ret->data=NULL; 381 ret->flags=0; 382 return(ret); 383 } 384 385 void ASN1_STRING_free(ASN1_STRING *a) 386 { 387 if (a == NULL) return; 388 if (a->data != NULL) OPENSSL_free(a->data); 389 OPENSSL_free(a); 390 } 391 392 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b) 393 { 394 int i; 395 396 i=(a->length-b->length); 397 if (i == 0) 398 { 399 i=memcmp(a->data,b->data,a->length); 400 if (i == 0) 401 return(a->type-b->type); 402 else 403 return(i); 404 } 405 else 406 return(i); 407 } 408 409 void asn1_add_error(unsigned char *address, int offset) 410 { 411 char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1]; 412 413 sprintf(buf1,"%lu",(unsigned long)address); 414 sprintf(buf2,"%d",offset); 415 ERR_add_error_data(4,"address=",buf1," offset=",buf2); 416 } 417 418 int ASN1_STRING_length(ASN1_STRING *x) 419 { return M_ASN1_STRING_length(x); } 420 421 void ASN1_STRING_length_set(ASN1_STRING *x, int len) 422 { M_ASN1_STRING_length_set(x, len); return; } 423 424 int ASN1_STRING_type(ASN1_STRING *x) 425 { return M_ASN1_STRING_type(x); } 426 427 unsigned char * ASN1_STRING_data(ASN1_STRING *x) 428 { return M_ASN1_STRING_data(x); } 429