crypto/x509/x_name.c

   1 /*
   2  * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 "crypto/ctype.h"
  12 #include "internal/cryptlib.h"
  13 #include <openssl/asn1t.h>
  14 #include <openssl/x509.h>
  15 #include "crypto/x509.h"
  16 #include "crypto/asn1.h"
  17 #include "x509_local.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(const 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(const STACK_OF(STACK_OF_X509_NAME_ENTRY) * intname,
  40                           unsigned char **in);
  41
  42 static int x509_name_ex_print(BIO *out, const 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         return 0;
  96     if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL) {
  97         ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB);
  98         goto err;
  99     }
 100     if ((ret->bytes = BUF_MEM_new()) == NULL) {
 101         ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
 102         goto err;
 103     }
 104     ret->modified = 1;
 105     *val = (ASN1_VALUE *)ret;
 106     return 1;
 107
 108  err:
 109     if (ret) {
 110         sk_X509_NAME_ENTRY_free(ret->entries);
 111         OPENSSL_free(ret);
 112     }
 113     return 0;
 114 }
 115
 116 static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 117 {
 118     X509_NAME *a;
 119
 120     if (pval == NULL || *pval == NULL)
 121         return;
 122     a = (X509_NAME *)*pval;
 123
 124     BUF_MEM_free(a->bytes);
 125     sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free);
 126     OPENSSL_free(a->canon_enc);
 127     OPENSSL_free(a);
 128     *pval = NULL;
 129 }
 130
 131 static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne)
 132 {
 133     sk_X509_NAME_ENTRY_free(ne);
 134 }
 135
 136 static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne)
 137 {
 138     sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
 139 }
 140
 141 static int x509_name_ex_d2i(ASN1_VALUE **val,
 142                             const unsigned char **in, long len,
 143                             const ASN1_ITEM *it, int tag, int aclass,
 144                             char opt, ASN1_TLC *ctx)
 145 {
 146     const unsigned char *p = *in, *q;
 147     union {
 148         STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
 149         ASN1_VALUE *a;
 150     } intname = {
 151         NULL
 152     };
 153     union {
 154         X509_NAME *x;
 155         ASN1_VALUE *a;
 156     } nm = {
 157         NULL
 158     };
 159     int i, j, ret;
 160     STACK_OF(X509_NAME_ENTRY) *entries;
 161     X509_NAME_ENTRY *entry;
 162
 163     if (len > X509_NAME_MAX)
 164         len = X509_NAME_MAX;
 165     q = p;
 166
 167     /* Get internal representation of Name */
 168     ret = ASN1_item_ex_d2i(&intname.a,
 169                            &p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
 170                            tag, aclass, opt, ctx);
 171
 172     if (ret <= 0)
 173         return ret;
 174
 175     if (*val)
 176         x509_name_ex_free(val, NULL);
 177     if (!x509_name_ex_new(&nm.a, NULL))
 178         goto err;
 179     /* We've decoded it: now cache encoding */
 180     if (!BUF_MEM_grow(nm.x->bytes, p - q))
 181         goto err;
 182     memcpy(nm.x->bytes->data, q, p - q);
 183
 184     /* Convert internal representation to X509_NAME structure */
 185     for (i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname.s); i++) {
 186         entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname.s, i);
 187         for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
 188             entry = sk_X509_NAME_ENTRY_value(entries, j);
 189             entry->set = i;
 190             if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry))
 191                 goto err;
 192             (void)sk_X509_NAME_ENTRY_set(entries, j, NULL);
 193         }
 194     }
 195     ret = x509_name_canon(nm.x);
 196     if (!ret)
 197         goto err;
 198     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 199                                          local_sk_X509_NAME_ENTRY_free);
 200     nm.x->modified = 0;
 201     *val = nm.a;
 202     *in = p;
 203     return ret;
 204
 205  err:
 206     if (nm.x != NULL)
 207         X509_NAME_free(nm.x);
 208     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 209                                          local_sk_X509_NAME_ENTRY_pop_free);
 210     ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
 211     return 0;
 212 }
 213
 214 static int x509_name_ex_i2d(const ASN1_VALUE **val, unsigned char **out,
 215                             const ASN1_ITEM *it, int tag, int aclass)
 216 {
 217     int ret;
 218     X509_NAME *a = (X509_NAME *)*val;
 219
 220     if (a->modified) {
 221         ret = x509_name_encode(a);
 222         if (ret < 0)
 223             return ret;
 224         ret = x509_name_canon(a);
 225         if (!ret)
 226             return -1;
 227     }
 228     ret = a->bytes->length;
 229     if (out != NULL) {
 230         memcpy(*out, a->bytes->data, ret);
 231         *out += ret;
 232     }
 233     return ret;
 234 }
 235
 236 static int x509_name_encode(X509_NAME *a)
 237 {
 238     union {
 239         STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
 240         const ASN1_VALUE *a;
 241     } intname = {
 242         NULL
 243     };
 244     int len;
 245     unsigned char *p;
 246     STACK_OF(X509_NAME_ENTRY) *entries = NULL;
 247     X509_NAME_ENTRY *entry;
 248     int i, set = -1;
 249
 250     intname.s = sk_STACK_OF_X509_NAME_ENTRY_new_null();
 251     if (!intname.s)
 252         goto cerr;
 253     for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
 254         entry = sk_X509_NAME_ENTRY_value(a->entries, i);
 255         if (entry->set != set) {
 256             entries = sk_X509_NAME_ENTRY_new_null();
 257             if (!entries)
 258                 goto cerr;
 259             if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s, entries)) {
 260                 sk_X509_NAME_ENTRY_free(entries);
 261                 goto cerr;
 262             }
 263             set = entry->set;
 264         }
 265         if (!sk_X509_NAME_ENTRY_push(entries, entry))
 266             goto cerr;
 267     }
 268     len = ASN1_item_ex_i2d(&intname.a, NULL,
 269                            ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
 270     if (!BUF_MEM_grow(a->bytes, len)) {
 271         ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
 272         goto err;
 273     }
 274     p = (unsigned char *)a->bytes->data;
 275     ASN1_item_ex_i2d(&intname.a,
 276                      &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
 277     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 278                                          local_sk_X509_NAME_ENTRY_free);
 279     a->modified = 0;
 280     return len;
 281  cerr:
 282     ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB);
 283  err:
 284     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 285                                          local_sk_X509_NAME_ENTRY_free);
 286     return -1;
 287 }
 288
 289 static int x509_name_ex_print(BIO *out, const ASN1_VALUE **pval,
 290                               int indent,
 291                               const char *fname, const ASN1_PCTX *pctx)
 292 {
 293     if (X509_NAME_print_ex(out, (const X509_NAME *)*pval,
 294                            indent, pctx->nm_flags) <= 0)
 295         return 0;
 296     return 2;
 297 }
 298
 299 /*
 300  * This function generates the canonical encoding of the Name structure. In
 301  * it all strings are converted to UTF8, leading, trailing and multiple
 302  * spaces collapsed, converted to lower case and the leading SEQUENCE header
 303  * removed. In future we could also normalize the UTF8 too. By doing this
 304  * comparison of Name structures can be rapidly performed by just using
 305  * memcmp() of the canonical encoding. By omitting the leading SEQUENCE name
 306  * constraints of type dirName can also be checked with a simple memcmp().
 307  * NOTE: For empty X509_NAME (NULL-DN), canon_enclen == 0 && canon_enc == NULL
 308  */
 309
 310 static int x509_name_canon(X509_NAME *a)
 311 {
 312     unsigned char *p;
 313     STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname;
 314     STACK_OF(X509_NAME_ENTRY) *entries = NULL;
 315     X509_NAME_ENTRY *entry, *tmpentry = NULL;
 316     int i, set = -1, ret = 0, len;
 317
 318     OPENSSL_free(a->canon_enc);
 319     a->canon_enc = NULL;
 320     /* Special case: empty X509_NAME => null encoding */
 321     if (sk_X509_NAME_ENTRY_num(a->entries) == 0) {
 322         a->canon_enclen = 0;
 323         return 1;
 324     }
 325     intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
 326     if (intname == NULL) {
 327         ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
 328         goto err;
 329     }
 330     for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
 331         entry = sk_X509_NAME_ENTRY_value(a->entries, i);
 332         if (entry->set != set) {
 333             entries = sk_X509_NAME_ENTRY_new_null();
 334             if (entries == NULL)
 335                 goto err;
 336             if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
 337                 sk_X509_NAME_ENTRY_free(entries);
 338                 ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
 339                 goto err;
 340             }
 341             set = entry->set;
 342         }
 343         tmpentry = X509_NAME_ENTRY_new();
 344         if (tmpentry == NULL) {
 345             ERR_raise(ERR_LIB_X509, ERR_R_ASN1_LIB);
 346             goto err;
 347         }
 348         tmpentry->object = OBJ_dup(entry->object);
 349         if (tmpentry->object == NULL) {
 350             ERR_raise(ERR_LIB_X509, ERR_R_OBJ_LIB);
 351             goto err;
 352         }
 353         if (!asn1_string_canon(tmpentry->value, entry->value))
 354             goto err;
 355         if (!sk_X509_NAME_ENTRY_push(entries, tmpentry)) {
 356             ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
 357             goto err;
 358         }
 359         tmpentry = NULL;
 360     }
 361
 362     /* Finally generate encoding */
 363     len = i2d_name_canon(intname, NULL);
 364     if (len < 0)
 365         goto err;
 366     a->canon_enclen = len;
 367
 368     p = OPENSSL_malloc(a->canon_enclen);
 369     if (p == NULL)
 370         goto err;
 371
 372     a->canon_enc = p;
 373
 374     i2d_name_canon(intname, &p);
 375
 376     ret = 1;
 377
 378  err:
 379     X509_NAME_ENTRY_free(tmpentry);
 380     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
 381                                          local_sk_X509_NAME_ENTRY_pop_free);
 382     return ret;
 383 }
 384
 385 /* Bitmap of all the types of string that will be canonicalized. */
 386
 387 #define ASN1_MASK_CANON \
 388         (B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \
 389         | B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \
 390         | B_ASN1_VISIBLESTRING)
 391
 392 static int asn1_string_canon(ASN1_STRING *out, const ASN1_STRING *in)
 393 {
 394     unsigned char *to, *from;
 395     int len, i;
 396
 397     /* If type not in bitmask just copy string across */
 398     if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON)) {
 399         if (!ASN1_STRING_copy(out, in))
 400             return 0;
 401         return 1;
 402     }
 403
 404     out->type = V_ASN1_UTF8STRING;
 405     out->length = ASN1_STRING_to_UTF8(&out->data, in);
 406     if (out->length == -1)
 407         return 0;
 408
 409     to = out->data;
 410     from = to;
 411
 412     len = out->length;
 413
 414     /*
 415      * Convert string in place to canonical form. Ultimately we may need to
 416      * handle a wider range of characters but for now ignore anything with
 417      * MSB set and rely on the ossl_isspace() to fail on bad characters without
 418      * needing isascii or range checks as well.
 419      */
 420
 421     /* Ignore leading spaces */
 422     while (len > 0 && ossl_isspace(*from)) {
 423         from++;
 424         len--;
 425     }
 426
 427     to = from + len;
 428
 429     /* Ignore trailing spaces */
 430     while (len > 0 && ossl_isspace(to[-1])) {
 431         to--;
 432         len--;
 433     }
 434
 435     to = out->data;
 436
 437     i = 0;
 438     while (i < len) {
 439         /* If not ASCII set just copy across */
 440         if (!ossl_isascii(*from)) {
 441             *to++ = *from++;
 442             i++;
 443         }
 444         /* Collapse multiple spaces */
 445         else if (ossl_isspace(*from)) {
 446             /* Copy one space across */
 447             *to++ = ' ';
 448             /*
 449              * Ignore subsequent spaces. Note: don't need to check len here
 450              * because we know the last character is a non-space so we can't
 451              * overflow.
 452              */
 453             do {
 454                 from++;
 455                 i++;
 456             }
 457             while (ossl_isspace(*from));
 458         } else {
 459             *to++ = ossl_tolower(*from);
 460             from++;
 461             i++;
 462         }
 463     }
 464
 465     out->length = to - out->data;
 466
 467     return 1;
 468
 469 }
 470
 471 static int i2d_name_canon(const STACK_OF(STACK_OF_X509_NAME_ENTRY) * _intname,
 472                           unsigned char **in)
 473 {
 474     int i, len, ltmp;
 475     const ASN1_VALUE *v;
 476     STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
 477
 478     len = 0;
 479     for (i = 0; i < sk_ASN1_VALUE_num(intname); i++) {
 480         v = sk_ASN1_VALUE_value(intname, i);
 481         ltmp = ASN1_item_ex_i2d(&v, in,
 482                                 ASN1_ITEM_rptr(X509_NAME_ENTRIES), -1, -1);
 483         if (ltmp < 0)
 484             return ltmp;
 485         len += ltmp;
 486     }
 487     return len;
 488 }
 489
 490 int X509_NAME_set(X509_NAME **xn, const X509_NAME *name)
 491 {
 492     X509_NAME *name_copy;
 493
 494     if (*xn == name)
 495         return *xn != NULL;
 496     if ((name_copy = X509_NAME_dup(name)) == NULL)
 497         return 0;
 498     X509_NAME_free(*xn);
 499     *xn = name_copy;
 500     return 1;
 501 }
 502
 503 int X509_NAME_print(BIO *bp, const X509_NAME *name, int obase)
 504 {
 505     char *s, *c, *b;
 506     int i;
 507
 508     b = X509_NAME_oneline(name, NULL, 0);
 509     if (b == NULL)
 510         return 0;
 511     if (*b == '\0') {
 512         OPENSSL_free(b);
 513         return 1;
 514     }
 515     s = b + 1;                  /* skip the first slash */
 516
 517     c = s;
 518     for (;;) {
 519         if (((*s == '/') &&
 520              (ossl_isupper(s[1]) && ((s[2] == '=') ||
 521                                 (ossl_isupper(s[2]) && (s[3] == '='))
 522               ))) || (*s == '\0'))
 523         {
 524             i = s - c;
 525             if (BIO_write(bp, c, i) != i)
 526                 goto err;
 527             c = s + 1;          /* skip following slash */
 528             if (*s != '\0') {
 529                 if (BIO_write(bp, ", ", 2) != 2)
 530                     goto err;
 531             }
 532         }
 533         if (*s == '\0')
 534             break;
 535         s++;
 536     }
 537
 538     OPENSSL_free(b);
 539     return 1;
 540  err:
 541     ERR_raise(ERR_LIB_X509, ERR_R_BUF_LIB);
 542     OPENSSL_free(b);
 543     return 0;
 544 }
 545
 546 int X509_NAME_get0_der(const X509_NAME *nm, const unsigned char **pder,
 547                        size_t *pderlen)
 548 {
 549     /* Make sure encoding is valid */
 550     if (i2d_X509_NAME(nm, NULL) <= 0)
 551         return 0;
 552     if (pder != NULL)
 553         *pder = (unsigned char *)nm->bytes->data;
 554     if (pderlen != NULL)
 555         *pderlen = nm->bytes->length;
 556     return 1;
 557 }