crypto/x509/x_name.c

   1 /*
   2  * Copyright 1995-2020 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 DEFINE_STACK_OF(X509_NAME_ENTRY)
  20 DEFINE_STACK_OF(ASN1_VALUE)
  21
  22 /*
  23  * Maximum length of X509_NAME: much larger than anything we should
  24  * ever see in practice.
  25  */
  26
  27 #define X509_NAME_MAX (1024 * 1024)
  28
  29 static int x509_name_ex_d2i(ASN1_VALUE **val,
  30                             const unsigned char **in, long len,
  31                             const ASN1_ITEM *it,
  32                             int tag, int aclass, char opt, ASN1_TLC *ctx);
  33
  34 static int x509_name_ex_i2d(const ASN1_VALUE **val, unsigned char **out,
  35                             const ASN1_ITEM *it, int tag, int aclass);
  36 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
  37 static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);
  38
  39 static int x509_name_encode(X509_NAME *a);
  40 static int x509_name_canon(X509_NAME *a);
  41 static int asn1_string_canon(ASN1_STRING *out, const ASN1_STRING *in);
  42 static int i2d_name_canon(const STACK_OF(STACK_OF_X509_NAME_ENTRY) * intname,
  43                           unsigned char **in);
  44
  45 static int x509_name_ex_print(BIO *out, const ASN1_VALUE **pval,
  46                               int indent,
  47                               const char *fname, const ASN1_PCTX *pctx);
  48
  49 ASN1_SEQUENCE(X509_NAME_ENTRY) = {
  50         ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
  51         ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE)
  52 } ASN1_SEQUENCE_END(X509_NAME_ENTRY)
  53
  54 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME_ENTRY)
  55 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME_ENTRY)
  56
  57 /*
  58  * For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY } so
  59  * declare two template wrappers for this
  60  */
  61
  62 ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) =
  63         ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF, 0, RDNS, X509_NAME_ENTRY)
  64 static_ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES)
  65
  66 ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) =
  67         ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES)
  68 static_ASN1_ITEM_TEMPLATE_END(X509_NAME_INTERNAL)
  69
  70 /*
  71  * Normally that's where it would end: we'd have two nested STACK structures
  72  * representing the ASN1. Unfortunately X509_NAME uses a completely different
  73  * form and caches encodings so we have to process the internal form and
  74  * convert to the external form.
  75  */
  76
  77 static const ASN1_EXTERN_FUNCS x509_name_ff = {
  78     NULL,
  79     x509_name_ex_new,
  80     x509_name_ex_free,
  81     0,                          /* Default clear behaviour is OK */
  82     x509_name_ex_d2i,
  83     x509_name_ex_i2d,
  84     x509_name_ex_print
  85 };
  86
  87 IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff)
  88
  89 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME)
  90
  91 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME)
  92
  93 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it)
  94 {
  95     X509_NAME *ret = OPENSSL_zalloc(sizeof(*ret));
  96
  97     if (ret == NULL)
  98         goto memerr;
  99     if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL)
 100         goto memerr;
 101     if ((ret->bytes = BUF_MEM_new()) == NULL)
 102         goto memerr;
 103     ret->modified = 1;
 104     *val = (ASN1_VALUE *)ret;
 105     return 1;
 106
 107  memerr:
 108     ASN1err(ASN1_F_X509_NAME_EX_NEW, ERR_R_MALLOC_FAILURE);
 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             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     ASN1err(ASN1_F_X509_NAME_EX_D2I, 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 < 0)
 226             return ret;
 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 memerr;
 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 memerr;
 259             if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s, entries)) {
 260                 sk_X509_NAME_ENTRY_free(entries);
 261                 goto memerr;
 262             }
 263             set = entry->set;
 264         }
 265         if (!sk_X509_NAME_ENTRY_push(entries, entry))
 266             goto memerr;
 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         goto memerr;
 272     p = (unsigned char *)a->bytes->data;
 273     ASN1_item_ex_i2d(&intname.a,
 274                      &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
 275     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 276                                          local_sk_X509_NAME_ENTRY_free);
 277     a->modified = 0;
 278     return len;
 279  memerr:
 280     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 281                                          local_sk_X509_NAME_ENTRY_free);
 282     ASN1err(ASN1_F_X509_NAME_ENCODE, ERR_R_MALLOC_FAILURE);
 283     return -1;
 284 }
 285
 286 static int x509_name_ex_print(BIO *out, const ASN1_VALUE **pval,
 287                               int indent,
 288                               const char *fname, const ASN1_PCTX *pctx)
 289 {
 290     if (X509_NAME_print_ex(out, (const X509_NAME *)*pval,
 291                            indent, pctx->nm_flags) <= 0)
 292         return 0;
 293     return 2;
 294 }
 295
 296 /*
 297  * This function generates the canonical encoding of the Name structure. In
 298  * it all strings are converted to UTF8, leading, trailing and multiple
 299  * spaces collapsed, converted to lower case and the leading SEQUENCE header
 300  * removed. In future we could also normalize the UTF8 too. By doing this
 301  * comparison of Name structures can be rapidly performed by just using
 302  * memcmp() of the canonical encoding. By omitting the leading SEQUENCE name
 303  * constraints of type dirName can also be checked with a simple memcmp().
 304  */
 305
 306 static int x509_name_canon(X509_NAME *a)
 307 {
 308     unsigned char *p;
 309     STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname;
 310     STACK_OF(X509_NAME_ENTRY) *entries = NULL;
 311     X509_NAME_ENTRY *entry, *tmpentry = NULL;
 312     int i, set = -1, ret = 0, len;
 313
 314     OPENSSL_free(a->canon_enc);
 315     a->canon_enc = NULL;
 316     /* Special case: empty X509_NAME => null encoding */
 317     if (sk_X509_NAME_ENTRY_num(a->entries) == 0) {
 318         a->canon_enclen = 0;
 319         return 1;
 320     }
 321     intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
 322     if (intname == NULL) {
 323         X509err(X509_F_X509_NAME_CANON, ERR_R_MALLOC_FAILURE);
 324         goto err;
 325     }
 326     for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
 327         entry = sk_X509_NAME_ENTRY_value(a->entries, i);
 328         if (entry->set != set) {
 329             entries = sk_X509_NAME_ENTRY_new_null();
 330             if (entries == NULL)
 331                 goto err;
 332             if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
 333                 sk_X509_NAME_ENTRY_free(entries);
 334                 X509err(X509_F_X509_NAME_CANON, ERR_R_MALLOC_FAILURE);
 335                 goto err;
 336             }
 337             set = entry->set;
 338         }
 339         tmpentry = X509_NAME_ENTRY_new();
 340         if (tmpentry == NULL) {
 341             X509err(X509_F_X509_NAME_CANON, ERR_R_MALLOC_FAILURE);
 342             goto err;
 343         }
 344         tmpentry->object = OBJ_dup(entry->object);
 345         if (tmpentry->object == NULL) {
 346             X509err(X509_F_X509_NAME_CANON, ERR_R_MALLOC_FAILURE);
 347             goto err;
 348         }
 349         if (!asn1_string_canon(tmpentry->value, entry->value))
 350             goto err;
 351         if (!sk_X509_NAME_ENTRY_push(entries, tmpentry)) {
 352             X509err(X509_F_X509_NAME_CANON, ERR_R_MALLOC_FAILURE);
 353             goto err;
 354         }
 355         tmpentry = NULL;
 356     }
 357
 358     /* Finally generate encoding */
 359     len = i2d_name_canon(intname, NULL);
 360     if (len < 0)
 361         goto err;
 362     a->canon_enclen = len;
 363
 364     p = OPENSSL_malloc(a->canon_enclen);
 365     if (p == NULL) {
 366         X509err(X509_F_X509_NAME_CANON, ERR_R_MALLOC_FAILURE);
 367         goto err;
 368     }
 369
 370     a->canon_enc = p;
 371
 372     i2d_name_canon(intname, &p);
 373
 374     ret = 1;
 375
 376  err:
 377     X509_NAME_ENTRY_free(tmpentry);
 378     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
 379                                          local_sk_X509_NAME_ENTRY_pop_free);
 380     return ret;
 381 }
 382
 383 /* Bitmap of all the types of string that will be canonicalized. */
 384
 385 #define ASN1_MASK_CANON \
 386         (B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \
 387         | B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \
 388         | B_ASN1_VISIBLESTRING)
 389
 390 static int asn1_string_canon(ASN1_STRING *out, const ASN1_STRING *in)
 391 {
 392     unsigned char *to, *from;
 393     int len, i;
 394
 395     /* If type not in bitmask just copy string across */
 396     if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON)) {
 397         if (!ASN1_STRING_copy(out, in))
 398             return 0;
 399         return 1;
 400     }
 401
 402     out->type = V_ASN1_UTF8STRING;
 403     out->length = ASN1_STRING_to_UTF8(&out->data, in);
 404     if (out->length == -1)
 405         return 0;
 406
 407     to = out->data;
 408     from = to;
 409
 410     len = out->length;
 411
 412     /*
 413      * Convert string in place to canonical form. Ultimately we may need to
 414      * handle a wider range of characters but for now ignore anything with
 415      * MSB set and rely on the ossl_isspace() to fail on bad characters without
 416      * needing isascii or range checks as well.
 417      */
 418
 419     /* Ignore leading spaces */
 420     while (len > 0 && ossl_isspace(*from)) {
 421         from++;
 422         len--;
 423     }
 424
 425     to = from + len;
 426
 427     /* Ignore trailing spaces */
 428     while (len > 0 && ossl_isspace(to[-1])) {
 429         to--;
 430         len--;
 431     }
 432
 433     to = out->data;
 434
 435     i = 0;
 436     while (i < len) {
 437         /* If not ASCII set just copy across */
 438         if (!ossl_isascii(*from)) {
 439             *to++ = *from++;
 440             i++;
 441         }
 442         /* Collapse multiple spaces */
 443         else if (ossl_isspace(*from)) {
 444             /* Copy one space across */
 445             *to++ = ' ';
 446             /*
 447              * Ignore subsequent spaces. Note: don't need to check len here
 448              * because we know the last character is a non-space so we can't
 449              * overflow.
 450              */
 451             do {
 452                 from++;
 453                 i++;
 454             }
 455             while (ossl_isspace(*from));
 456         } else {
 457             *to++ = ossl_tolower(*from);
 458             from++;
 459             i++;
 460         }
 461     }
 462
 463     out->length = to - out->data;
 464
 465     return 1;
 466
 467 }
 468
 469 static int i2d_name_canon(const STACK_OF(STACK_OF_X509_NAME_ENTRY) * _intname,
 470                           unsigned char **in)
 471 {
 472     int i, len, ltmp;
 473     const ASN1_VALUE *v;
 474     STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
 475
 476     len = 0;
 477     for (i = 0; i < sk_ASN1_VALUE_num(intname); i++) {
 478         v = sk_ASN1_VALUE_value(intname, i);
 479         ltmp = ASN1_item_ex_i2d(&v, in,
 480                                 ASN1_ITEM_rptr(X509_NAME_ENTRIES), -1, -1);
 481         if (ltmp < 0)
 482             return ltmp;
 483         len += ltmp;
 484     }
 485     return len;
 486 }
 487
 488 int X509_NAME_set(X509_NAME **xn, const X509_NAME *name)
 489 {
 490     X509_NAME *name_copy;
 491
 492     if (*xn == name)
 493         return *xn != NULL;
 494     if ((name_copy = X509_NAME_dup(name)) == NULL)
 495         return 0;
 496     X509_NAME_free(*xn);
 497     *xn = name_copy;
 498     return 1;
 499 }
 500
 501 int X509_NAME_print(BIO *bp, const X509_NAME *name, int obase)
 502 {
 503     char *s, *c, *b;
 504     int l, i;
 505
 506     l = 80 - 2 - obase;
 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             l--;
 533         }
 534         if (*s == '\0')
 535             break;
 536         s++;
 537         l--;
 538     }
 539
 540     OPENSSL_free(b);
 541     return 1;
 542  err:
 543     X509err(X509_F_X509_NAME_PRINT, ERR_R_BUF_LIB);
 544     OPENSSL_free(b);
 545     return 0;
 546 }
 547
 548 int X509_NAME_get0_der(const X509_NAME *nm, const unsigned char **pder,
 549                        size_t *pderlen)
 550 {
 551     /* Make sure encoding is valid */
 552     if (i2d_X509_NAME(nm, NULL) <= 0)
 553         return 0;
 554     if (pder != NULL)
 555         *pder = (unsigned char *)nm->bytes->data;
 556     if (pderlen != NULL)
 557         *pderlen = nm->bytes->length;
 558     return 1;
 559 }