crypto/x509/x_name.c

   1 /*
   2  * Copyright 1995-2016 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 <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, 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 int x509_name_ex_d2i(ASN1_VALUE **val,
 129                             const unsigned char **in, long len,
 130                             const ASN1_ITEM *it, int tag, int aclass,
 131                             char opt, ASN1_TLC *ctx)
 132 {
 133     const unsigned char *p = *in, *q;
 134     union {
 135         STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
 136         ASN1_VALUE *a;
 137     } intname = {
 138         NULL
 139     };
 140     union {
 141         X509_NAME *x;
 142         ASN1_VALUE *a;
 143     } nm = {
 144         NULL
 145     };
 146     int i, j, ret;
 147     STACK_OF(X509_NAME_ENTRY) *entries;
 148     X509_NAME_ENTRY *entry;
 149     if (len > X509_NAME_MAX)
 150         len = X509_NAME_MAX;
 151     q = p;
 152
 153     /* Get internal representation of Name */
 154     ret = ASN1_item_ex_d2i(&intname.a,
 155                            &p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
 156                            tag, aclass, opt, ctx);
 157
 158     if (ret <= 0)
 159         return ret;
 160
 161     if (*val)
 162         x509_name_ex_free(val, NULL);
 163     if (!x509_name_ex_new(&nm.a, NULL))
 164         goto err;
 165     /* We've decoded it: now cache encoding */
 166     if (!BUF_MEM_grow(nm.x->bytes, p - q))
 167         goto err;
 168     memcpy(nm.x->bytes->data, q, p - q);
 169
 170     /* Convert internal representation to X509_NAME structure */
 171     for (i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname.s); i++) {
 172         entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname.s, i);
 173         for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
 174             entry = sk_X509_NAME_ENTRY_value(entries, j);
 175             entry->set = i;
 176             if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry)) {
 177                 /*
 178                  * Free all in entries if sk_X509_NAME_ENTRY_push return failure.
 179                  * X509_NAME_ENTRY_free will check the null entry.
 180                  */
 181                 sk_X509_NAME_ENTRY_pop_free(entries, X509_NAME_ENTRY_free);
 182                 goto err;
 183             }
 184             /*
 185              * If sk_X509_NAME_ENTRY_push return success, clean the entries[j].
 186              * It's necessary when 'goto err;' happens.
 187              */
 188             sk_X509_NAME_ENTRY_set(entries, j, NULL);
 189         }
 190         sk_X509_NAME_ENTRY_free(entries);
 191         sk_STACK_OF_X509_NAME_ENTRY_set(intname.s, i, NULL);
 192     }
 193
 194     sk_STACK_OF_X509_NAME_ENTRY_free(intname.s);
 195     intname.s = NULL;
 196     ret = x509_name_canon(nm.x);
 197     if (!ret)
 198         goto err;
 199     nm.x->modified = 0;
 200     *val = nm.a;
 201     *in = p;
 202     return ret;
 203
 204  err:
 205     X509_NAME_free(nm.x);
 206     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s, sk_X509_NAME_ENTRY_free);
 207     ASN1err(ASN1_F_X509_NAME_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
 208     return 0;
 209 }
 210
 211 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
 212                             const ASN1_ITEM *it, int tag, int aclass)
 213 {
 214     int ret;
 215     X509_NAME *a = (X509_NAME *)*val;
 216     if (a->modified) {
 217         ret = x509_name_encode(a);
 218         if (ret < 0)
 219             return ret;
 220         ret = x509_name_canon(a);
 221         if (ret < 0)
 222             return ret;
 223     }
 224     ret = a->bytes->length;
 225     if (out != NULL) {
 226         memcpy(*out, a->bytes->data, ret);
 227         *out += ret;
 228     }
 229     return ret;
 230 }
 231
 232 static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne)
 233 {
 234     sk_X509_NAME_ENTRY_free(ne);
 235 }
 236
 237 static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne)
 238 {
 239     sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
 240 }
 241
 242 static int x509_name_encode(X509_NAME *a)
 243 {
 244     union {
 245         STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
 246         ASN1_VALUE *a;
 247     } intname = {
 248         NULL
 249     };
 250     int len;
 251     unsigned char *p;
 252     STACK_OF(X509_NAME_ENTRY) *entries = NULL;
 253     X509_NAME_ENTRY *entry;
 254     int i, set = -1;
 255     intname.s = sk_STACK_OF_X509_NAME_ENTRY_new_null();
 256     if (!intname.s)
 257         goto memerr;
 258     for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
 259         entry = sk_X509_NAME_ENTRY_value(a->entries, i);
 260         if (entry->set != set) {
 261             entries = sk_X509_NAME_ENTRY_new_null();
 262             if (!entries)
 263                 goto memerr;
 264             if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s, entries))
 265                 goto memerr;
 266             set = entry->set;
 267         }
 268         if (!sk_X509_NAME_ENTRY_push(entries, entry))
 269             goto memerr;
 270     }
 271     len = ASN1_item_ex_i2d(&intname.a, NULL,
 272                            ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
 273     if (!BUF_MEM_grow(a->bytes, len))
 274         goto memerr;
 275     p = (unsigned char *)a->bytes->data;
 276     ASN1_item_ex_i2d(&intname.a,
 277                      &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
 278     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 279                                          local_sk_X509_NAME_ENTRY_free);
 280     a->modified = 0;
 281     return len;
 282  memerr:
 283     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
 284                                          local_sk_X509_NAME_ENTRY_free);
 285     ASN1err(ASN1_F_X509_NAME_ENCODE, ERR_R_MALLOC_FAILURE);
 286     return -1;
 287 }
 288
 289 static int x509_name_ex_print(BIO *out, ASN1_VALUE **pval,
 290                               int indent,
 291                               const char *fname, const ASN1_PCTX *pctx)
 292 {
 293     if (X509_NAME_print_ex(out, (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  */
 308
 309 static int x509_name_canon(X509_NAME *a)
 310 {
 311     unsigned char *p;
 312     STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL;
 313     STACK_OF(X509_NAME_ENTRY) *entries = NULL;
 314     X509_NAME_ENTRY *entry, *tmpentry = NULL;
 315     int i, set = -1, ret = 0, len;
 316
 317     OPENSSL_free(a->canon_enc);
 318     a->canon_enc = NULL;
 319     /* Special case: empty X509_NAME => null encoding */
 320     if (sk_X509_NAME_ENTRY_num(a->entries) == 0) {
 321         a->canon_enclen = 0;
 322         return 1;
 323     }
 324     intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
 325     if (!intname)
 326         goto err;
 327     for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
 328         entry = sk_X509_NAME_ENTRY_value(a->entries, i);
 329         if (entry->set != set) {
 330             entries = sk_X509_NAME_ENTRY_new_null();
 331             if (!entries)
 332                 goto err;
 333             if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries))
 334                 goto err;
 335             set = entry->set;
 336         }
 337         tmpentry = X509_NAME_ENTRY_new();
 338         if (tmpentry == NULL)
 339             goto err;
 340         tmpentry->object = OBJ_dup(entry->object);
 341         if (tmpentry->object == NULL)
 342             goto err;
 343         if (!asn1_string_canon(tmpentry->value, entry->value))
 344             goto err;
 345         if (!sk_X509_NAME_ENTRY_push(entries, tmpentry))
 346             goto err;
 347         tmpentry = NULL;
 348     }
 349
 350     /* Finally generate encoding */
 351
 352     len = i2d_name_canon(intname, NULL);
 353     if (len < 0)
 354         goto err;
 355     a->canon_enclen = len;
 356
 357     p = OPENSSL_malloc(a->canon_enclen);
 358
 359     if (p == NULL)
 360         goto err;
 361
 362     a->canon_enc = p;
 363
 364     i2d_name_canon(intname, &p);
 365
 366     ret = 1;
 367
 368  err:
 369
 370     X509_NAME_ENTRY_free(tmpentry);
 371     sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
 372                                          local_sk_X509_NAME_ENTRY_pop_free);
 373     return ret;
 374 }
 375
 376 /* Bitmap of all the types of string that will be canonicalized. */
 377
 378 #define ASN1_MASK_CANON \
 379         (B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \
 380         | B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \
 381         | B_ASN1_VISIBLESTRING)
 382
 383 static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in)
 384 {
 385     unsigned char *to, *from;
 386     int len, i;
 387
 388     /* If type not in bitmask just copy string across */
 389     if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON)) {
 390         if (!ASN1_STRING_copy(out, in))
 391             return 0;
 392         return 1;
 393     }
 394
 395     out->type = V_ASN1_UTF8STRING;
 396     out->length = ASN1_STRING_to_UTF8(&out->data, in);
 397     if (out->length == -1)
 398         return 0;
 399
 400     to = out->data;
 401     from = to;
 402
 403     len = out->length;
 404
 405     /*
 406      * Convert string in place to canonical form. Ultimately we may need to
 407      * handle a wider range of characters but for now ignore anything with
 408      * MSB set and rely on the isspace() and tolower() functions.
 409      */
 410
 411     /* Ignore leading spaces */
 412     while ((len > 0) && !(*from & 0x80) && isspace(*from)) {
 413         from++;
 414         len--;
 415     }
 416
 417     to = from + len;
 418
 419     /* Ignore trailing spaces */
 420     while ((len > 0) && !(to[-1] & 0x80) && isspace(to[-1])) {
 421         to--;
 422         len--;
 423     }
 424
 425     to = out->data;
 426
 427     i = 0;
 428     while (i < len) {
 429         /* If MSB set just copy across */
 430         if (*from & 0x80) {
 431             *to++ = *from++;
 432             i++;
 433         }
 434         /* Collapse multiple spaces */
 435         else if (isspace(*from)) {
 436             /* Copy one space across */
 437             *to++ = ' ';
 438             /*
 439              * Ignore subsequent spaces. Note: don't need to check len here
 440              * because we know the last character is a non-space so we can't
 441              * overflow.
 442              */
 443             do {
 444                 from++;
 445                 i++;
 446             }
 447             while (!(*from & 0x80) && isspace(*from));
 448         } else {
 449             *to++ = tolower(*from);
 450             from++;
 451             i++;
 452         }
 453     }
 454
 455     out->length = to - out->data;
 456
 457     return 1;
 458
 459 }
 460
 461 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) * _intname,
 462                           unsigned char **in)
 463 {
 464     int i, len, ltmp;
 465     ASN1_VALUE *v;
 466     STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
 467
 468     len = 0;
 469     for (i = 0; i < sk_ASN1_VALUE_num(intname); i++) {
 470         v = sk_ASN1_VALUE_value(intname, i);
 471         ltmp = ASN1_item_ex_i2d(&v, in,
 472                                 ASN1_ITEM_rptr(X509_NAME_ENTRIES), -1, -1);
 473         if (ltmp < 0)
 474             return ltmp;
 475         len += ltmp;
 476     }
 477     return len;
 478 }
 479
 480 int X509_NAME_set(X509_NAME **xn, X509_NAME *name)
 481 {
 482     X509_NAME *in;
 483
 484     if (!xn || !name)
 485         return (0);
 486
 487     if (*xn != name) {
 488         in = X509_NAME_dup(name);
 489         if (in != NULL) {
 490             X509_NAME_free(*xn);
 491             *xn = in;
 492         }
 493     }
 494     return (*xn != NULL);
 495 }
 496
 497 int X509_NAME_print(BIO *bp, X509_NAME *name, int obase)
 498 {
 499     char *s, *c, *b;
 500     int l, i;
 501
 502     l = 80 - 2 - obase;
 503
 504     b = X509_NAME_oneline(name, NULL, 0);
 505     if (!b)
 506         return 0;
 507     if (!*b) {
 508         OPENSSL_free(b);
 509         return 1;
 510     }
 511     s = b + 1;                  /* skip the first slash */
 512
 513     c = s;
 514     for (;;) {
 515 #ifndef CHARSET_EBCDIC
 516         if (((*s == '/') &&
 517              ((s[1] >= 'A') && (s[1] <= 'Z') && ((s[2] == '=') ||
 518                                                  ((s[2] >= 'A')
 519                                                   && (s[2] <= 'Z')
 520                                                   && (s[3] == '='))
 521               ))) || (*s == '\0'))
 522 #else
 523         if (((*s == '/') &&
 524              (isupper(s[1]) && ((s[2] == '=') ||
 525                                 (isupper(s[2]) && (s[3] == '='))
 526               ))) || (*s == '\0'))
 527 #endif
 528         {
 529             i = s - c;
 530             if (BIO_write(bp, c, i) != i)
 531                 goto err;
 532             c = s + 1;          /* skip following slash */
 533             if (*s != '\0') {
 534                 if (BIO_write(bp, ", ", 2) != 2)
 535                     goto err;
 536             }
 537             l--;
 538         }
 539         if (*s == '\0')
 540             break;
 541         s++;
 542         l--;
 543     }
 544
 545     OPENSSL_free(b);
 546     return 1;
 547  err:
 548     X509err(X509_F_X509_NAME_PRINT, ERR_R_BUF_LIB);
 549     OPENSSL_free(b);
 550     return 0;
 551 }
 552
 553 int X509_NAME_get0_der(const unsigned char **pder, size_t *pderlen,
 554                        X509_NAME *nm)
 555 {
 556     /* Make sure encoding is valid */
 557     if (i2d_X509_NAME(nm, NULL) <= 0)
 558         return 0;
 559     if (pder != NULL)
 560         *pder = (unsigned char *)nm->bytes->data;
 561     if (pderlen != NULL)
 562         *pderlen = nm->bytes->length;
 563     return 1;
 564 }