lib/libcrypto/x509/by_dir.c

   1 /* $OpenBSD: by_dir.c,v 1.38 2017/01/29 17:49:23 beck Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <sys/types.h>
  60
  61 #include <errno.h>
  62 #include <stdio.h>
  63 #include <string.h>
  64 #include <time.h>
  65 #include <unistd.h>
  66
  67 #include <openssl/opensslconf.h>
  68
  69 #include <openssl/err.h>
  70 #include <openssl/lhash.h>
  71 #include <openssl/x509.h>
  72
  73 # include <sys/stat.h>
  74
  75 typedef struct lookup_dir_hashes_st {
  76         unsigned long hash;
  77         int suffix;
  78 } BY_DIR_HASH;
  79
  80 typedef struct lookup_dir_entry_st {
  81         char *dir;
  82         int dir_type;
  83         STACK_OF(BY_DIR_HASH) *hashes;
  84 } BY_DIR_ENTRY;
  85
  86 typedef struct lookup_dir_st {
  87         BUF_MEM *buffer;
  88         STACK_OF(BY_DIR_ENTRY) *dirs;
  89 } BY_DIR;
  90
  91 DECLARE_STACK_OF(BY_DIR_HASH)
  92 DECLARE_STACK_OF(BY_DIR_ENTRY)
  93
  94 static int dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
  95     char **ret);
  96 static int new_dir(X509_LOOKUP *lu);
  97 static void free_dir(X509_LOOKUP *lu);
  98 static int add_cert_dir(BY_DIR *ctx, const char *dir, int type);
  99 static int get_cert_by_subject(X509_LOOKUP *xl, int type, X509_NAME *name,
 100     X509_OBJECT *ret);
 101
 102 static X509_LOOKUP_METHOD x509_dir_lookup = {
 103         .name = "Load certs from files in a directory",
 104         .new_item = new_dir,
 105         .free = free_dir,
 106         .init = NULL,
 107         .shutdown = NULL,
 108         .ctrl = dir_ctrl,
 109         .get_by_subject = get_cert_by_subject,
 110         .get_by_issuer_serial = NULL,
 111         .get_by_fingerprint = NULL,
 112         .get_by_alias = NULL,
 113 };
 114
 115 X509_LOOKUP_METHOD *
 116 X509_LOOKUP_hash_dir(void)
 117 {
 118         return (&x509_dir_lookup);
 119 }
 120
 121 static int
 122 dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
 123     char **retp)
 124 {
 125         int ret = 0;
 126         BY_DIR *ld;
 127
 128         ld = (BY_DIR *)ctx->method_data;
 129
 130         switch (cmd) {
 131         case X509_L_ADD_DIR:
 132                 if (argl == X509_FILETYPE_DEFAULT) {
 133                         ret = add_cert_dir(ld, X509_get_default_cert_dir(),
 134                             X509_FILETYPE_PEM);
 135                         if (!ret) {
 136                                 X509error(X509_R_LOADING_CERT_DIR);
 137                         }
 138                 } else
 139                         ret = add_cert_dir(ld, argp, (int)argl);
 140                 break;
 141         }
 142         return (ret);
 143 }
 144
 145 static int
 146 new_dir(X509_LOOKUP *lu)
 147 {
 148         BY_DIR *a;
 149
 150         if ((a = malloc(sizeof(BY_DIR))) == NULL)
 151                 return (0);
 152         if ((a->buffer = BUF_MEM_new()) == NULL) {
 153                 free(a);
 154                 return (0);
 155         }
 156         a->dirs = NULL;
 157         lu->method_data = (char *)a;
 158         return (1);
 159 }
 160
 161 static void
 162 by_dir_hash_free(BY_DIR_HASH *hash)
 163 {
 164         free(hash);
 165 }
 166
 167 static int
 168 by_dir_hash_cmp(const BY_DIR_HASH * const *a,
 169     const BY_DIR_HASH * const *b)
 170 {
 171         if ((*a)->hash > (*b)->hash)
 172                 return 1;
 173         if ((*a)->hash < (*b)->hash)
 174                 return -1;
 175         return 0;
 176 }
 177
 178 static void
 179 by_dir_entry_free(BY_DIR_ENTRY *ent)
 180 {
 181         free(ent->dir);
 182         if (ent->hashes)
 183                 sk_BY_DIR_HASH_pop_free(ent->hashes, by_dir_hash_free);
 184         free(ent);
 185 }
 186
 187 static void
 188 free_dir(X509_LOOKUP *lu)
 189 {
 190         BY_DIR *a;
 191
 192         a = (BY_DIR *)lu->method_data;
 193         if (a->dirs != NULL)
 194                 sk_BY_DIR_ENTRY_pop_free(a->dirs, by_dir_entry_free);
 195         if (a->buffer != NULL)
 196                 BUF_MEM_free(a->buffer);
 197         free(a);
 198 }
 199
 200 static int
 201 add_cert_dir(BY_DIR *ctx, const char *dir, int type)
 202 {
 203         int j;
 204         const char *s, *ss, *p;
 205         ptrdiff_t len;
 206
 207         if (dir == NULL || !*dir) {
 208                 X509error(X509_R_INVALID_DIRECTORY);
 209                 return 0;
 210         }
 211
 212         s = dir;
 213         p = s;
 214         do {
 215                 if ((*p == ':') || (*p == '\0')) {
 216                         BY_DIR_ENTRY *ent;
 217                         ss = s;
 218                         s = p + 1;
 219                         len = p - ss;
 220                         if (len == 0)
 221                                 continue;
 222                         for (j = 0; j < sk_BY_DIR_ENTRY_num(ctx->dirs); j++) {
 223                                 ent = sk_BY_DIR_ENTRY_value(ctx->dirs, j);
 224                                 if (strlen(ent->dir) == (size_t)len &&
 225                                     strncmp(ent->dir, ss, (size_t)len) == 0)
 226                                         break;
 227                         }
 228                         if (j < sk_BY_DIR_ENTRY_num(ctx->dirs))
 229                                 continue;
 230                         if (ctx->dirs == NULL) {
 231                                 ctx->dirs = sk_BY_DIR_ENTRY_new_null();
 232                                 if (!ctx->dirs) {
 233                                         X509error(ERR_R_MALLOC_FAILURE);
 234                                         return 0;
 235                                 }
 236                         }
 237                         ent = malloc(sizeof(BY_DIR_ENTRY));
 238                         if (!ent) {
 239                                 X509error(ERR_R_MALLOC_FAILURE);
 240                                 return 0;
 241                         }
 242                         ent->dir_type = type;
 243                         ent->hashes = sk_BY_DIR_HASH_new(by_dir_hash_cmp);
 244                         ent->dir = strndup(ss, (size_t)len);
 245                         if (!ent->dir || !ent->hashes) {
 246                                 X509error(ERR_R_MALLOC_FAILURE);
 247                                 by_dir_entry_free(ent);
 248                                 return 0;
 249                         }
 250                         if (!sk_BY_DIR_ENTRY_push(ctx->dirs, ent)) {
 251                                 X509error(ERR_R_MALLOC_FAILURE);
 252                                 by_dir_entry_free(ent);
 253                                 return 0;
 254                         }
 255                 }
 256         } while (*p++ != '\0');
 257         return 1;
 258 }
 259
 260 static int
 261 get_cert_by_subject(X509_LOOKUP *xl, int type, X509_NAME *name,
 262     X509_OBJECT *ret)
 263 {
 264         BY_DIR *ctx;
 265         union   {
 266                 struct  {
 267                         X509 st_x509;
 268                         X509_CINF st_x509_cinf;
 269                 } x509;
 270                 struct  {
 271                         X509_CRL st_crl;
 272                         X509_CRL_INFO st_crl_info;
 273                 } crl;
 274         } data;
 275         int ok = 0;
 276         int i, j, k;
 277         unsigned long h;
 278         BUF_MEM *b = NULL;
 279         X509_OBJECT stmp, *tmp;
 280         const char *postfix="";
 281
 282         if (name == NULL)
 283                 return (0);
 284
 285         stmp.type = type;
 286         if (type == X509_LU_X509) {
 287                 data.x509.st_x509.cert_info = &data.x509.st_x509_cinf;
 288                 data.x509.st_x509_cinf.subject = name;
 289                 stmp.data.x509 = &data.x509.st_x509;
 290                 postfix="";
 291         } else if (type == X509_LU_CRL) {
 292                 data.crl.st_crl.crl = &data.crl.st_crl_info;
 293                 data.crl.st_crl_info.issuer = name;
 294                 stmp.data.crl = &data.crl.st_crl;
 295                 postfix="r";
 296         } else {
 297                 X509error(X509_R_WRONG_LOOKUP_TYPE);
 298                 goto finish;
 299         }
 300
 301         if ((b = BUF_MEM_new()) == NULL) {
 302                 X509error(ERR_R_BUF_LIB);
 303                 goto finish;
 304         }
 305
 306         ctx = (BY_DIR *)xl->method_data;
 307
 308         h = X509_NAME_hash(name);
 309         for (i = 0; i < sk_BY_DIR_ENTRY_num(ctx->dirs); i++) {
 310                 BY_DIR_ENTRY *ent;
 311                 int idx;
 312                 BY_DIR_HASH htmp, *hent;
 313                 ent = sk_BY_DIR_ENTRY_value(ctx->dirs, i);
 314                 j = strlen(ent->dir) + 1 + 8 + 6 + 1 + 1;
 315                 if (!BUF_MEM_grow(b, j)) {
 316                         X509error(ERR_R_MALLOC_FAILURE);
 317                         goto finish;
 318                 }
 319                 if (type == X509_LU_CRL && ent->hashes) {
 320                         htmp.hash = h;
 321                         CRYPTO_r_lock(CRYPTO_LOCK_X509_STORE);
 322                         idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 323                         if (idx >= 0) {
 324                                 hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 325                                 k = hent->suffix;
 326                         } else {
 327                                 hent = NULL;
 328                                 k = 0;
 329                         }
 330                         CRYPTO_r_unlock(CRYPTO_LOCK_X509_STORE);
 331                 } else {
 332                         k = 0;
 333                         hent = NULL;
 334                 }
 335                 for (;;) {
 336                         (void) snprintf(b->data, b->max, "%s/%08lx.%s%d",
 337                             ent->dir, h, postfix, k);
 338
 339                         {
 340                                 struct stat st;
 341                                 if (stat(b->data, &st) < 0)
 342                                         break;
 343                         }
 344                         /* found one. */
 345                         if (type == X509_LU_X509) {
 346                                 if ((X509_load_cert_file(xl, b->data,
 347                                     ent->dir_type)) == 0)
 348                                         break;
 349                         } else if (type == X509_LU_CRL) {
 350                                 if ((X509_load_crl_file(xl, b->data,
 351                                     ent->dir_type)) == 0)
 352                                         break;
 353                         }
 354                         /* else case will caught higher up */
 355                         k++;
 356                 }
 357
 358                 /* we have added it to the cache so now pull it out again */
 359                 CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 360                 j = sk_X509_OBJECT_find(xl->store_ctx->objs, &stmp);
 361                 if (j != -1)
 362                         tmp = sk_X509_OBJECT_value(xl->store_ctx->objs, j);
 363                 else
 364                         tmp = NULL;
 365                 CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 366
 367                 /* If a CRL, update the last file suffix added for this */
 368                 if (type == X509_LU_CRL) {
 369                         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 370                         /*
 371                          * Look for entry again in case another thread added
 372                          * an entry first.
 373                          */
 374                         if (!hent) {
 375                                 htmp.hash = h;
 376                                 idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 377                                 if (idx >= 0)
 378                                         hent = sk_BY_DIR_HASH_value(
 379                                             ent->hashes, idx);
 380                         }
 381                         if (!hent) {
 382                                 hent = malloc(sizeof(BY_DIR_HASH));
 383                                 if (!hent) {
 384                                         X509error(ERR_R_MALLOC_FAILURE);
 385                                         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 386                                         ok = 0;
 387                                         goto finish;
 388                                 }
 389                                 hent->hash = h;
 390                                 hent->suffix = k;
 391                                 if (!sk_BY_DIR_HASH_push(ent->hashes, hent)) {
 392                                         X509error(ERR_R_MALLOC_FAILURE);
 393                                         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 394                                         free(hent);
 395                                         ok = 0;
 396                                         goto finish;
 397                                 }
 398                         } else if (hent->suffix < k)
 399                                 hent->suffix = k;
 400
 401                         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 402
 403                 }
 404
 405                 if (tmp != NULL) {
 406                         ok = 1;
 407                         ret->type = tmp->type;
 408                         memcpy(&ret->data, &tmp->data, sizeof(ret->data));
 409                         /*
 410                          * If we were going to up the reference count,
 411                          * we would need to do it on a perl 'type' basis
 412                          */
 413         /*              CRYPTO_add(&tmp->data.x509->references,1,
 414                                 CRYPTO_LOCK_X509);*/
 415                         goto finish;
 416                 }
 417         }
 418 finish:
 419         if (b != NULL)
 420                 BUF_MEM_free(b);
 421         return (ok);
 422 }