crypto/x509/x_name.c

   1 /*
   2  * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/ctype.h"
  12 #include "internal/cryptlib.h"
  13 #include <openssl/asn1t.h>
  14 #include <openssl/x509.h>
  15 #include "internal/x509_int.h"
  16 #include "internal/asn1_int.h"
  17 #include "x509_lcl.h"
  18
  19 /*
  20  * Maximum length of X509_NAME: much larger than anything we should
  21  * ever see in practice.
  22  */
  23
  24 #define X509_NAME_MAX (1024 * 1024)
  25
  26 static int x509_name_ex_d2i(ASN1_VALUE **val,
  27                             const unsigned char **in, long len,
  28                             const ASN1_ITEM *it,
  29                             int tag, int aclass, char opt, ASN1_TLC *ctx);
  30
  31 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
  32                             const ASN1_ITEM *it, int tag, int aclass);
  33 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
  34 static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);
  35
  36 static int x509_name_encode(X509_NAME *a);
  37 static int x509_name_canon(X509_NAME *a);
  38 static int asn1_string_canon(ASN1_STRING *out, const ASN1_STRING *in);
  39 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) * intname,
  40                           unsigned char **in);
  41
  42 static int x509_name_ex_print(BIO *out, ASN1_VALUE **pval,
  43                               int indent,
  44                               const char *fname, const ASN1_PCTX *pctx);
  45
  46 ASN1_SEQUENCE(X509_NAME_ENTRY) = {
  47         ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
  48         ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE)
  49 } ASN1_SEQUENCE_END(X509_NAME_ENTRY)
  50
  51 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME_ENTRY)
  52 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME_ENTRY)
  53
  54 /*
  55  * For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY } so
  56  * declare two template wrappers for this
  57  */
  58
  59 ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) =
  60         ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF, 0, RDNS, X509_NAME_ENTRY)
  61 static_ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES)
  62
  63 ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) =
  64         ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES)
  65 static_ASN1_ITEM_TEMPLATE_END(X509_NAME_INTERNAL)
  66
  67 /*
  68  * Normally that's where it would end: we'd have two nested STACK structures
  69  * representing the ASN1. Unfortunately X509_NAME uses a completely different
  70  * form and caches encodings so we have to process the internal form and
  71  * convert to the external form.
  72  */
  73
  74 static const ASN1_EXTERN_FUNCS x509_name_ff = {
  75     NULL,
  76     x509_name_ex_new,
  77     x509_name_ex_free,
  78     0,                          /* Default clear behaviour is OK */
  79     x509_name_ex_d2i,
  80     x509_name_ex_i2d,
  81     x509_name_ex_print
  82 };
  83
  84 IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff)
  85
  86 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME)
  87
  88 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME)
  89
  90 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it)
  91 {
  92     X509_NAME *ret = OPENSSL_zalloc(sizeof(*ret));
  93
  94     if (ret == NULL)
  95         goto memerr;
  96     if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL)
  97         goto memerr;
  98     if ((ret->bytes = BUF_MEM_new()) == NULL)
  99         goto memerr;
 100     ret->modified = 1;
 101     *val = (ASN1_VALUE *)ret;
 102     return 1;
 103
 104  memerr:
 105     ASN1err(ASN1_F_X509_NAME_EX_NEW, ERR_R_MALLOC_FAILURE);
 106     if (ret) {
 107         sk_X509_NAME_ENTRY_free(ret->entries);
 108         OPENSSL_free(ret);
 109     }
 110     return 0;
 111 }
 112
 113 static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 114 {
 115     X509_NAME *a;
 116
 117     if (!pval || !*pval)
 118         return;
 119     a = (X509_NAME *)*pval;
 120
 121     BUF_MEM_free(a->bytes);
 122     sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free);
 123     OPENSSL_free(a->canon_enc);
 124     OPENSSL_free(a);
 125     *pval = NULL;
 126 }
 127
 128 static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne)
 129 {
 130     sk_X509_NAME_ENTRY_free(ne);
 131 }
 132
 133 static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne)
 134 {
 135     sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
 136 }
 137
 138 static int x509_name_ex_d2i(ASN1_VALUE **val,
 139                             const unsigned char **in, long len,
 140                             const ASN1_ITEM *it, int tag, int aclass,
 141                             char opt, ASN1_TLC *ctx)
 142 {
 143     const unsigned char *p = *in, *q;
 144     union {
 145         STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
 146         ASN1_VALUE *a;
 147     } intname = {
 148         NULL
 149     };
 150     union {
 151         X509_NAME *x;
 152         ASN1_VALUE *a;
 153     } nm = {
 154         NULL
 155     };
 156     int i, j, ret;
 157     STACK_OF(X509_NAME_ENTRY) *entries;
 158     X509_NAME_ENTRY *entry;
 159     if (len > X509_NAME_MAX)
 160         len = X509_NAME_MAX;
 161     q = p;
 162
 163     /* Get internal representation of Name */
 164     ret = ASN1_item_ex_d2i(&intname.a,
 165                            &p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
 166                            tag, aclass, opt, ctx);
 167
 168     if (ret <= 0)
 169         return ret;
 170
 171     if (*val)
 172         x509_name_ex_free(val, NULL);
 173     if (!x509_name_ex_new(&nm.a, NULL))
 174         goto err;
 175     /* We've decoded it: now cache encoding */
 176     if (!BUF_MEM_grow(nm.x->bytes, p - q))
 177         goto err;
 178     memcpy(nm.x->bytes->data, q, p - q);
 179
 180     /* Convert internal representation to X509_NAME structure */
 181     for (i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname.s); i++) {
 182         entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname.s, i);
 183         for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
 184             entry = sk_X509_NAME_ENTRY_value(entries, j);
 185             entry->set = i;
 186             if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry))
 187                 goto err;
 188             sk_X509_NAME_ENTRY_set(entries, j, NULL);
 189         }
 190     }
 191     ret = x509_name_canon(nm.x);
 192     if (!ret)
 193         goto err;
 194     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 195                                          local_sk_X509_NAME_ENTRY_free);
 196     nm.x->modified = 0;
 197     *val = nm.a;
 198     *in = p;
 199     return ret;
 200
 201  err:
 202     if (nm.x != NULL)
 203         X509_NAME_free(nm.x);
 204     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 205                                          local_sk_X509_NAME_ENTRY_pop_free);
 206     ASN1err(ASN1_F_X509_NAME_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
 207     return 0;
 208 }
 209
 210 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
 211                             const ASN1_ITEM *it, int tag, int aclass)
 212 {
 213     int ret;
 214     X509_NAME *a = (X509_NAME *)*val;
 215     if (a->modified) {
 216         ret = x509_name_encode(a);
 217         if (ret < 0)
 218             return ret;
 219         ret = x509_name_canon(a);
 220         if (ret < 0)
 221             return ret;
 222     }
 223     ret = a->bytes->length;
 224     if (out != NULL) {
 225         memcpy(*out, a->bytes->data, ret);
 226         *out += ret;
 227     }
 228     return ret;
 229 }
 230
 231 static int x509_name_encode(X509_NAME *a)
 232 {
 233     union {
 234         STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
 235         ASN1_VALUE *a;
 236     } intname = {
 237         NULL
 238     };
 239     int len;
 240     unsigned char *p;
 241     STACK_OF(X509_NAME_ENTRY) *entries = NULL;
 242     X509_NAME_ENTRY *entry;
 243     int i, set = -1;
 244     intname.s = sk_STACK_OF_X509_NAME_ENTRY_new_null();
 245     if (!intname.s)
 246         goto memerr;
 247     for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
 248         entry = sk_X509_NAME_ENTRY_value(a->entries, i);
 249         if (entry->set != set) {
 250             entries = sk_X509_NAME_ENTRY_new_null();
 251             if (!entries)
 252                 goto memerr;
 253             if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s, entries)) {
 254                 sk_X509_NAME_ENTRY_free(entries);
 255                 goto memerr;
 256             }
 257             set = entry->set;
 258         }
 259         if (!sk_X509_NAME_ENTRY_push(entries, entry))
 260             goto memerr;
 261     }
 262     len = ASN1_item_ex_i2d(&intname.a, NULL,
 263                            ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
 264     if (!BUF_MEM_grow(a->bytes, len))
 265         goto memerr;
 266     p = (unsigned char *)a->bytes->data;
 267     ASN1_item_ex_i2d(&intname.a,
 268                      &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
 269     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 270                                          local_sk_X509_NAME_ENTRY_free);
 271     a->modified = 0;
 272     return len;
 273  memerr:
 274     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 275                                          local_sk_X509_NAME_ENTRY_free);
 276     ASN1err(ASN1_F_X509_NAME_ENCODE, ERR_R_MALLOC_FAILURE);
 277     return -1;
 278 }
 279
 280 static int x509_name_ex_print(BIO *out, ASN1_VALUE **pval,
 281                               int indent,
 282                               const char *fname, const ASN1_PCTX *pctx)
 283 {
 284     if (X509_NAME_print_ex(out, (const X509_NAME *)*pval,
 285                            indent, pctx->nm_flags) <= 0)
 286         return 0;
 287     return 2;
 288 }
 289
 290 /*
 291  * This function generates the canonical encoding of the Name structure. In
 292  * it all strings are converted to UTF8, leading, trailing and multiple
 293  * spaces collapsed, converted to lower case and the leading SEQUENCE header
 294  * removed. In future we could also normalize the UTF8 too. By doing this
 295  * comparison of Name structures can be rapidly performed by just using
 296  * memcmp() of the canonical encoding. By omitting the leading SEQUENCE name
 297  * constraints of type dirName can also be checked with a simple memcmp().
 298  */
 299
 300 static int x509_name_canon(X509_NAME *a)
 301 {
 302     unsigned char *p;
 303     STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL;
 304     STACK_OF(X509_NAME_ENTRY) *entries = NULL;
 305     X509_NAME_ENTRY *entry, *tmpentry = NULL;
 306     int i, set = -1, ret = 0, len;
 307
 308     OPENSSL_free(a->canon_enc);
 309     a->canon_enc = NULL;
 310     /* Special case: empty X509_NAME => null encoding */
 311     if (sk_X509_NAME_ENTRY_num(a->entries) == 0) {
 312         a->canon_enclen = 0;
 313         return 1;
 314     }
 315     intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
 316     if (!intname)
 317         goto err;
 318     for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
 319         entry = sk_X509_NAME_ENTRY_value(a->entries, i);
 320         if (entry->set != set) {
 321             entries = sk_X509_NAME_ENTRY_new_null();
 322             if (!entries)
 323                 goto err;
 324             if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
 325                 sk_X509_NAME_ENTRY_free(entries);
 326                 goto err;
 327             }
 328             set = entry->set;
 329         }
 330         tmpentry = X509_NAME_ENTRY_new();
 331         if (tmpentry == NULL)
 332             goto err;
 333         tmpentry->object = OBJ_dup(entry->object);
 334         if (tmpentry->object == NULL)
 335             goto err;
 336         if (!asn1_string_canon(tmpentry->value, entry->value))
 337             goto err;
 338         if (!sk_X509_NAME_ENTRY_push(entries, tmpentry))
 339             goto err;
 340         tmpentry = NULL;
 341     }
 342
 343     /* Finally generate encoding */
 344
 345     len = i2d_name_canon(intname, NULL);
 346     if (len < 0)
 347         goto err;
 348     a->canon_enclen = len;
 349
 350     p = OPENSSL_malloc(a->canon_enclen);
 351
 352     if (p == NULL)
 353         goto err;
 354
 355     a->canon_enc = p;
 356
 357     i2d_name_canon(intname, &p);
 358
 359     ret = 1;
 360
 361  err:
 362
 363     X509_NAME_ENTRY_free(tmpentry);
 364     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
 365                                          local_sk_X509_NAME_ENTRY_pop_free);
 366     return ret;
 367 }
 368
 369 /* Bitmap of all the types of string that will be canonicalized. */
 370
 371 #define ASN1_MASK_CANON \
 372         (B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \
 373         | B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \
 374         | B_ASN1_VISIBLESTRING)
 375
 376 static int asn1_string_canon(ASN1_STRING *out, const ASN1_STRING *in)
 377 {
 378     unsigned char *to, *from;
 379     int len, i;
 380
 381     /* If type not in bitmask just copy string across */
 382     if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON)) {
 383         if (!ASN1_STRING_copy(out, in))
 384             return 0;
 385         return 1;
 386     }
 387
 388     out->type = V_ASN1_UTF8STRING;
 389     out->length = ASN1_STRING_to_UTF8(&out->data, in);
 390     if (out->length == -1)
 391         return 0;
 392
 393     to = out->data;
 394     from = to;
 395
 396     len = out->length;
 397
 398     /*
 399      * Convert string in place to canonical form. Ultimately we may need to
 400      * handle a wider range of characters but for now ignore anything with
 401      * MSB set and rely on the ossl_isspace() to fail on bad characters without
 402      * needing isascii or range checks as well.
 403      */
 404
 405     /* Ignore leading spaces */
 406     while (len > 0 && ossl_isspace(*from)) {
 407         from++;
 408         len--;
 409     }
 410
 411     to = from + len;
 412
 413     /* Ignore trailing spaces */
 414     while (len > 0 && ossl_isspace(to[-1])) {
 415         to--;
 416         len--;
 417     }
 418
 419     to = out->data;
 420
 421     i = 0;
 422     while (i < len) {
 423         /* If not ASCII set just copy across */
 424         if (!ossl_isascii(*from)) {
 425             *to++ = *from++;
 426             i++;
 427         }
 428         /* Collapse multiple spaces */
 429         else if (ossl_isspace(*from)) {
 430             /* Copy one space across */
 431             *to++ = ' ';
 432             /*
 433              * Ignore subsequent spaces. Note: don't need to check len here
 434              * because we know the last character is a non-space so we can't
 435              * overflow.
 436              */
 437             do {
 438                 from++;
 439                 i++;
 440             }
 441             while (ossl_isspace(*from));
 442         } else {
 443             *to++ = ossl_tolower(*from);
 444             from++;
 445             i++;
 446         }
 447     }
 448
 449     out->length = to - out->data;
 450
 451     return 1;
 452
 453 }
 454
 455 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) * _intname,
 456                           unsigned char **in)
 457 {
 458     int i, len, ltmp;
 459     ASN1_VALUE *v;
 460     STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
 461
 462     len = 0;
 463     for (i = 0; i < sk_ASN1_VALUE_num(intname); i++) {
 464         v = sk_ASN1_VALUE_value(intname, i);
 465         ltmp = ASN1_item_ex_i2d(&v, in,
 466                                 ASN1_ITEM_rptr(X509_NAME_ENTRIES), -1, -1);
 467         if (ltmp < 0)
 468             return ltmp;
 469         len += ltmp;
 470     }
 471     return len;
 472 }
 473
 474 int X509_NAME_set(X509_NAME **xn, X509_NAME *name)
 475 {
 476     X509_NAME *in;
 477
 478     if (!xn || !name)
 479         return (0);
 480
 481     if (*xn != name) {
 482         in = X509_NAME_dup(name);
 483         if (in != NULL) {
 484             X509_NAME_free(*xn);
 485             *xn = in;
 486         }
 487     }
 488     return (*xn != NULL);
 489 }
 490
 491 int X509_NAME_print(BIO *bp, const X509_NAME *name, int obase)
 492 {
 493     char *s, *c, *b;
 494     int l, i;
 495
 496     l = 80 - 2 - obase;
 497
 498     b = X509_NAME_oneline(name, NULL, 0);
 499     if (!b)
 500         return 0;
 501     if (!*b) {
 502         OPENSSL_free(b);
 503         return 1;
 504     }
 505     s = b + 1;                  /* skip the first slash */
 506
 507     c = s;
 508     for (;;) {
 509         if (((*s == '/') &&
 510              (ossl_isupper(s[1]) && ((s[2] == '=') ||
 511                                 (ossl_isupper(s[2]) && (s[3] == '='))
 512               ))) || (*s == '\0'))
 513         {
 514             i = s - c;
 515             if (BIO_write(bp, c, i) != i)
 516                 goto err;
 517             c = s + 1;          /* skip following slash */
 518             if (*s != '\0') {
 519                 if (BIO_write(bp, ", ", 2) != 2)
 520                     goto err;
 521             }
 522             l--;
 523         }
 524         if (*s == '\0')
 525             break;
 526         s++;
 527         l--;
 528     }
 529
 530     OPENSSL_free(b);
 531     return 1;
 532  err:
 533     X509err(X509_F_X509_NAME_PRINT, ERR_R_BUF_LIB);
 534     OPENSSL_free(b);
 535     return 0;
 536 }
 537
 538 int X509_NAME_get0_der(X509_NAME *nm, const unsigned char **pder,
 539                        size_t *pderlen)
 540 {
 541     /* Make sure encoding is valid */
 542     if (i2d_X509_NAME(nm, NULL) <= 0)
 543         return 0;
 544     if (pder != NULL)
 545         *pder = (unsigned char *)nm->bytes->data;
 546     if (pderlen != NULL)
 547         *pderlen = nm->bytes->length;
 548     return 1;
 549 }