1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <ctype.h> 58 #include <string.h> 59 60 #include <openssl/asn1.h> 61 #include <openssl/asn1t.h> 62 #include <openssl/buf.h> 63 #include <openssl/err.h> 64 #include <openssl/mem.h> 65 #include <openssl/obj.h> 66 #include <openssl/stack.h> 67 #include <openssl/x509.h> 68 69 #include "../asn1/asn1_locl.h" 70 #include "../internal.h" 71 72 73 typedef STACK_OF(X509_NAME_ENTRY) STACK_OF_X509_NAME_ENTRY; 74 DEFINE_STACK_OF(STACK_OF_X509_NAME_ENTRY) 75 76 /* 77 * Maximum length of X509_NAME: much larger than anything we should 78 * ever see in practice. 79 */ 80 81 #define X509_NAME_MAX (1024 * 1024) 82 83 static int x509_name_ex_d2i(ASN1_VALUE **val, 84 const unsigned char **in, long len, 85 const ASN1_ITEM *it, 86 int tag, int aclass, char opt, ASN1_TLC *ctx); 87 88 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out, 89 const ASN1_ITEM *it, int tag, int aclass); 90 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it); 91 static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it); 92 93 static int x509_name_encode(X509_NAME *a); 94 static int x509_name_canon(X509_NAME *a); 95 static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in); 96 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) * intname, 97 unsigned char **in); 98 99 ASN1_SEQUENCE(X509_NAME_ENTRY) = { 100 ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT), 101 ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE) 102 } ASN1_SEQUENCE_END(X509_NAME_ENTRY) 103 104 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME_ENTRY) 105 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME_ENTRY) 106 107 /* 108 * For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY } so 109 * declare two template wrappers for this 110 */ 111 112 ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) = 113 ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF, 0, RDNS, X509_NAME_ENTRY) 114 ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES) 115 116 ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) = 117 ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES) 118 ASN1_ITEM_TEMPLATE_END(X509_NAME_INTERNAL) 119 120 /* 121 * Normally that's where it would end: we'd have two nested STACK structures 122 * representing the ASN1. Unfortunately X509_NAME uses a completely different 123 * form and caches encodings so we have to process the internal form and 124 * convert to the external form. 125 */ 126 127 static const ASN1_EXTERN_FUNCS x509_name_ff = { 128 NULL, 129 x509_name_ex_new, 130 x509_name_ex_free, 131 0, /* Default clear behaviour is OK */ 132 x509_name_ex_d2i, 133 x509_name_ex_i2d, 134 NULL, 135 }; 136 137 IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff) 138 139 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME) 140 141 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME) 142 143 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it) 144 { 145 X509_NAME *ret = NULL; 146 ret = OPENSSL_malloc(sizeof(X509_NAME)); 147 if (!ret) 148 goto memerr; 149 if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL) 150 goto memerr; 151 if ((ret->bytes = BUF_MEM_new()) == NULL) 152 goto memerr; 153 ret->canon_enc = NULL; 154 ret->canon_enclen = 0; 155 ret->modified = 1; 156 *val = (ASN1_VALUE *)ret; 157 return 1; 158 159 memerr: 160 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 161 if (ret) { 162 if (ret->entries) 163 sk_X509_NAME_ENTRY_free(ret->entries); 164 OPENSSL_free(ret); 165 } 166 return 0; 167 } 168 169 static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 170 { 171 X509_NAME *a; 172 if (!pval || !*pval) 173 return; 174 a = (X509_NAME *)*pval; 175 176 BUF_MEM_free(a->bytes); 177 sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free); 178 if (a->canon_enc) 179 OPENSSL_free(a->canon_enc); 180 OPENSSL_free(a); 181 *pval = NULL; 182 } 183 184 static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne) 185 { 186 sk_X509_NAME_ENTRY_free(ne); 187 } 188 189 static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne) 190 { 191 sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free); 192 } 193 194 static int x509_name_ex_d2i(ASN1_VALUE **val, 195 const unsigned char **in, long len, 196 const ASN1_ITEM *it, int tag, int aclass, 197 char opt, ASN1_TLC *ctx) 198 { 199 const unsigned char *p = *in, *q; 200 union { 201 STACK_OF(STACK_OF_X509_NAME_ENTRY) *s; 202 ASN1_VALUE *a; 203 } intname = { 204 NULL 205 }; 206 union { 207 X509_NAME *x; 208 ASN1_VALUE *a; 209 } nm = { 210 NULL 211 }; 212 size_t i, j; 213 int ret; 214 STACK_OF(X509_NAME_ENTRY) *entries; 215 X509_NAME_ENTRY *entry; 216 /* Bound the size of an X509_NAME we are willing to parse. */ 217 if (len > X509_NAME_MAX) { 218 len = X509_NAME_MAX; 219 } 220 q = p; 221 222 /* Get internal representation of Name */ 223 ret = ASN1_item_ex_d2i(&intname.a, 224 &p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL), 225 tag, aclass, opt, ctx); 226 227 if (ret <= 0) 228 return ret; 229 230 if (*val) 231 x509_name_ex_free(val, NULL); 232 if (!x509_name_ex_new(&nm.a, NULL)) 233 goto err; 234 /* We've decoded it: now cache encoding */ 235 if (!BUF_MEM_grow(nm.x->bytes, p - q)) 236 goto err; 237 OPENSSL_memcpy(nm.x->bytes->data, q, p - q); 238 239 /* Convert internal representation to X509_NAME structure */ 240 for (i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname.s); i++) { 241 entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname.s, i); 242 for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) { 243 entry = sk_X509_NAME_ENTRY_value(entries, j); 244 entry->set = i; 245 if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry)) 246 goto err; 247 (void)sk_X509_NAME_ENTRY_set(entries, j, NULL); 248 } 249 } 250 ret = x509_name_canon(nm.x); 251 if (!ret) 252 goto err; 253 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s, 254 local_sk_X509_NAME_ENTRY_free); 255 nm.x->modified = 0; 256 *val = nm.a; 257 *in = p; 258 return ret; 259 err: 260 if (nm.x != NULL) 261 X509_NAME_free(nm.x); 262 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s, 263 local_sk_X509_NAME_ENTRY_pop_free); 264 OPENSSL_PUT_ERROR(X509, ERR_R_ASN1_LIB); 265 return 0; 266 } 267 268 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out, 269 const ASN1_ITEM *it, int tag, int aclass) 270 { 271 int ret; 272 X509_NAME *a = (X509_NAME *)*val; 273 if (a->modified) { 274 ret = x509_name_encode(a); 275 if (ret < 0) 276 return ret; 277 ret = x509_name_canon(a); 278 if (ret < 0) 279 return ret; 280 } 281 ret = a->bytes->length; 282 if (out != NULL) { 283 OPENSSL_memcpy(*out, a->bytes->data, ret); 284 *out += ret; 285 } 286 return ret; 287 } 288 289 static int x509_name_encode(X509_NAME *a) 290 { 291 union { 292 STACK_OF(STACK_OF_X509_NAME_ENTRY) *s; 293 ASN1_VALUE *a; 294 } intname = { 295 NULL 296 }; 297 int len; 298 unsigned char *p; 299 STACK_OF(X509_NAME_ENTRY) *entries = NULL; 300 X509_NAME_ENTRY *entry; 301 int set = -1; 302 size_t i; 303 intname.s = sk_STACK_OF_X509_NAME_ENTRY_new_null(); 304 if (!intname.s) 305 goto memerr; 306 for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) { 307 entry = sk_X509_NAME_ENTRY_value(a->entries, i); 308 if (entry->set != set) { 309 entries = sk_X509_NAME_ENTRY_new_null(); 310 if (!entries) 311 goto memerr; 312 if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s, entries)) { 313 sk_X509_NAME_ENTRY_free(entries); 314 goto memerr; 315 } 316 set = entry->set; 317 } 318 if (!sk_X509_NAME_ENTRY_push(entries, entry)) 319 goto memerr; 320 } 321 len = ASN1_item_ex_i2d(&intname.a, NULL, 322 ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1); 323 if (!BUF_MEM_grow(a->bytes, len)) 324 goto memerr; 325 p = (unsigned char *)a->bytes->data; 326 ASN1_item_ex_i2d(&intname.a, 327 &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1); 328 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s, 329 local_sk_X509_NAME_ENTRY_free); 330 a->modified = 0; 331 return len; 332 memerr: 333 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s, 334 local_sk_X509_NAME_ENTRY_free); 335 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 336 return -1; 337 } 338 339 /* 340 * This function generates the canonical encoding of the Name structure. In 341 * it all strings are converted to UTF8, leading, trailing and multiple 342 * spaces collapsed, converted to lower case and the leading SEQUENCE header 343 * removed. In future we could also normalize the UTF8 too. By doing this 344 * comparison of Name structures can be rapidly perfomed by just using 345 * OPENSSL_memcmp() of the canonical encoding. By omitting the leading SEQUENCE name 346 * constraints of type dirName can also be checked with a simple OPENSSL_memcmp(). 347 */ 348 349 static int x509_name_canon(X509_NAME *a) 350 { 351 unsigned char *p; 352 STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL; 353 STACK_OF(X509_NAME_ENTRY) *entries = NULL; 354 X509_NAME_ENTRY *entry, *tmpentry = NULL; 355 int set = -1, ret = 0, len; 356 size_t i; 357 358 if (a->canon_enc) { 359 OPENSSL_free(a->canon_enc); 360 a->canon_enc = NULL; 361 } 362 /* Special case: empty X509_NAME => null encoding */ 363 if (sk_X509_NAME_ENTRY_num(a->entries) == 0) { 364 a->canon_enclen = 0; 365 return 1; 366 } 367 intname = sk_STACK_OF_X509_NAME_ENTRY_new_null(); 368 if (!intname) 369 goto err; 370 for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) { 371 entry = sk_X509_NAME_ENTRY_value(a->entries, i); 372 if (entry->set != set) { 373 entries = sk_X509_NAME_ENTRY_new_null(); 374 if (!entries) 375 goto err; 376 if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) { 377 sk_X509_NAME_ENTRY_free(entries); 378 goto err; 379 } 380 set = entry->set; 381 } 382 tmpentry = X509_NAME_ENTRY_new(); 383 if (tmpentry == NULL) 384 goto err; 385 tmpentry->object = OBJ_dup(entry->object); 386 if (!asn1_string_canon(tmpentry->value, entry->value)) 387 goto err; 388 if (!sk_X509_NAME_ENTRY_push(entries, tmpentry)) 389 goto err; 390 tmpentry = NULL; 391 } 392 393 /* Finally generate encoding */ 394 395 len = i2d_name_canon(intname, NULL); 396 if (len < 0) { 397 goto err; 398 } 399 a->canon_enclen = len; 400 401 p = OPENSSL_malloc(a->canon_enclen); 402 403 if (!p) 404 goto err; 405 406 a->canon_enc = p; 407 408 i2d_name_canon(intname, &p); 409 410 ret = 1; 411 412 err: 413 414 if (tmpentry) 415 X509_NAME_ENTRY_free(tmpentry); 416 if (intname) 417 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname, 418 local_sk_X509_NAME_ENTRY_pop_free); 419 return ret; 420 } 421 422 /* Bitmap of all the types of string that will be canonicalized. */ 423 424 #define ASN1_MASK_CANON \ 425 (B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \ 426 | B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \ 427 | B_ASN1_VISIBLESTRING) 428 429 static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in) 430 { 431 unsigned char *to, *from; 432 int len, i; 433 434 /* If type not in bitmask just copy string across */ 435 if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON)) { 436 if (!ASN1_STRING_copy(out, in)) 437 return 0; 438 return 1; 439 } 440 441 out->type = V_ASN1_UTF8STRING; 442 out->length = ASN1_STRING_to_UTF8(&out->data, in); 443 if (out->length == -1) 444 return 0; 445 446 to = out->data; 447 from = to; 448 449 len = out->length; 450 451 /* 452 * Convert string in place to canonical form. Ultimately we may need to 453 * handle a wider range of characters but for now ignore anything with 454 * MSB set and rely on the isspace() and tolower() functions. 455 */ 456 457 /* Ignore leading spaces */ 458 while ((len > 0) && !(*from & 0x80) && isspace(*from)) { 459 from++; 460 len--; 461 } 462 463 to = from + len; 464 465 /* Ignore trailing spaces */ 466 while ((len > 0) && !(to[-1] & 0x80) && isspace(to[-1])) { 467 to--; 468 len--; 469 } 470 471 to = out->data; 472 473 i = 0; 474 while (i < len) { 475 /* If MSB set just copy across */ 476 if (*from & 0x80) { 477 *to++ = *from++; 478 i++; 479 } 480 /* Collapse multiple spaces */ 481 else if (isspace(*from)) { 482 /* Copy one space across */ 483 *to++ = ' '; 484 /* 485 * Ignore subsequent spaces. Note: don't need to check len here 486 * because we know the last character is a non-space so we can't 487 * overflow. 488 */ 489 do { 490 from++; 491 i++; 492 } 493 while (!(*from & 0x80) && isspace(*from)); 494 } else { 495 *to++ = OPENSSL_tolower(*from); 496 from++; 497 i++; 498 } 499 } 500 501 out->length = to - out->data; 502 503 return 1; 504 505 } 506 507 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) * _intname, 508 unsigned char **in) 509 { 510 int len, ltmp; 511 size_t i; 512 ASN1_VALUE *v; 513 STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname; 514 515 len = 0; 516 for (i = 0; i < sk_ASN1_VALUE_num(intname); i++) { 517 v = sk_ASN1_VALUE_value(intname, i); 518 ltmp = ASN1_item_ex_i2d(&v, in, 519 ASN1_ITEM_rptr(X509_NAME_ENTRIES), -1, -1); 520 if (ltmp < 0) 521 return ltmp; 522 len += ltmp; 523 } 524 return len; 525 } 526 527 int X509_NAME_set(X509_NAME **xn, X509_NAME *name) 528 { 529 if ((name = X509_NAME_dup(name)) == NULL) 530 return 0; 531 X509_NAME_free(*xn); 532 *xn = name; 533 return 1; 534 } 535 536 IMPLEMENT_ASN1_SET_OF(X509_NAME_ENTRY) 537 538 int X509_NAME_ENTRY_set(const X509_NAME_ENTRY *ne) 539 { 540 return ne->set; 541 } 542 543 int X509_NAME_get0_der(X509_NAME *nm, const unsigned char **pder, 544 size_t *pderlen) 545 { 546 /* Make sure encoding is valid */ 547 if (i2d_X509_NAME(nm, NULL) <= 0) 548 return 0; 549 if (pder != NULL) 550 *pder = (unsigned char *)nm->bytes->data; 551 if (pderlen != NULL) 552 *pderlen = nm->bytes->length; 553 return 1; 554 } 555
