crypto/x509/by_dir.c

   1 /*
   2  * Copyright 1995-2023 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 #if defined (__TANDEM) && defined (_SPT_MODEL_)
  11   /*
  12    * These definitions have to come first in SPT due to scoping of the
  13    * declarations in c99 associated with SPT use of stat.
  14    */
  15 # include <sys/types.h>
  16 # include <sys/stat.h>
  17 #endif
  18
  19 #include "internal/e_os.h"
  20 #include "internal/cryptlib.h"
  21 #include <stdio.h>
  22 #include <time.h>
  23 #include <errno.h>
  24 #include <sys/types.h>
  25
  26 #ifndef OPENSSL_NO_POSIX_IO
  27 # include <sys/stat.h>
  28 #endif
  29
  30 #include <openssl/x509.h>
  31 #include "crypto/x509.h"
  32 #include "x509_local.h"
  33
  34 struct lookup_dir_hashes_st {
  35     unsigned long hash;
  36     int suffix;
  37 };
  38
  39 struct lookup_dir_entry_st {
  40     char *dir;
  41     int dir_type;
  42     STACK_OF(BY_DIR_HASH) *hashes;
  43 };
  44
  45 typedef struct lookup_dir_st {
  46     BUF_MEM *buffer;
  47     STACK_OF(BY_DIR_ENTRY) *dirs;
  48     CRYPTO_RWLOCK *lock;
  49 } BY_DIR;
  50
  51 static int dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
  52                     char **retp);
  53
  54 static int new_dir(X509_LOOKUP *lu);
  55 static void free_dir(X509_LOOKUP *lu);
  56 static int add_cert_dir(BY_DIR *ctx, const char *dir, int type);
  57 static int get_cert_by_subject(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
  58                                const X509_NAME *name, X509_OBJECT *ret);
  59 static int get_cert_by_subject_ex(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
  60                                   const X509_NAME *name, X509_OBJECT *ret,
  61                                   OSSL_LIB_CTX *libctx, const char *propq);
  62 static X509_LOOKUP_METHOD x509_dir_lookup = {
  63     "Load certs from files in a directory",
  64     new_dir,                         /* new_item */
  65     free_dir,                        /* free */
  66     NULL,                            /* init */
  67     NULL,                            /* shutdown */
  68     dir_ctrl,                        /* ctrl */
  69     get_cert_by_subject,             /* get_by_subject */
  70     NULL,                            /* get_by_issuer_serial */
  71     NULL,                            /* get_by_fingerprint */
  72     NULL,                            /* get_by_alias */
  73     get_cert_by_subject_ex,          /* get_by_subject_ex */
  74     NULL,                            /* ctrl_ex */
  75 };
  76
  77 X509_LOOKUP_METHOD *X509_LOOKUP_hash_dir(void)
  78 {
  79     return &x509_dir_lookup;
  80 }
  81
  82 static int dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
  83                     char **retp)
  84 {
  85     int ret = 0;
  86     BY_DIR *ld = (BY_DIR *)ctx->method_data;
  87
  88     switch (cmd) {
  89     case X509_L_ADD_DIR:
  90         if (argl == X509_FILETYPE_DEFAULT) {
  91             const char *dir = ossl_safe_getenv(X509_get_default_cert_dir_env());
  92
  93             if (dir)
  94                 ret = add_cert_dir(ld, dir, X509_FILETYPE_PEM);
  95             else
  96                 ret = add_cert_dir(ld, X509_get_default_cert_dir(),
  97                                    X509_FILETYPE_PEM);
  98             if (!ret) {
  99                 ERR_raise(ERR_LIB_X509, X509_R_LOADING_CERT_DIR);
 100             }
 101         } else
 102             ret = add_cert_dir(ld, argp, (int)argl);
 103         break;
 104     }
 105     return ret;
 106 }
 107
 108 static int new_dir(X509_LOOKUP *lu)
 109 {
 110     BY_DIR *a = OPENSSL_malloc(sizeof(*a));
 111
 112     if (a == NULL)
 113         return 0;
 114
 115     if ((a->buffer = BUF_MEM_new()) == NULL) {
 116         ERR_raise(ERR_LIB_X509, ERR_R_BN_LIB);
 117         goto err;
 118     }
 119     a->dirs = NULL;
 120     a->lock = CRYPTO_THREAD_lock_new();
 121     if (a->lock == NULL) {
 122         BUF_MEM_free(a->buffer);
 123         ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
 124         goto err;
 125     }
 126     lu->method_data = a;
 127     return 1;
 128
 129  err:
 130     OPENSSL_free(a);
 131     return 0;
 132 }
 133
 134 static void by_dir_hash_free(BY_DIR_HASH *hash)
 135 {
 136     OPENSSL_free(hash);
 137 }
 138
 139 static int by_dir_hash_cmp(const BY_DIR_HASH *const *a,
 140                            const BY_DIR_HASH *const *b)
 141 {
 142     if ((*a)->hash > (*b)->hash)
 143         return 1;
 144     if ((*a)->hash < (*b)->hash)
 145         return -1;
 146     return 0;
 147 }
 148
 149 static void by_dir_entry_free(BY_DIR_ENTRY *ent)
 150 {
 151     OPENSSL_free(ent->dir);
 152     sk_BY_DIR_HASH_pop_free(ent->hashes, by_dir_hash_free);
 153     OPENSSL_free(ent);
 154 }
 155
 156 static void free_dir(X509_LOOKUP *lu)
 157 {
 158     BY_DIR *a = (BY_DIR *)lu->method_data;
 159
 160     sk_BY_DIR_ENTRY_pop_free(a->dirs, by_dir_entry_free);
 161     BUF_MEM_free(a->buffer);
 162     CRYPTO_THREAD_lock_free(a->lock);
 163     OPENSSL_free(a);
 164 }
 165
 166 static int add_cert_dir(BY_DIR *ctx, const char *dir, int type)
 167 {
 168     int j;
 169     size_t len;
 170     const char *s, *ss, *p;
 171
 172     if (dir == NULL || *dir == '\0') {
 173         ERR_raise(ERR_LIB_X509, X509_R_INVALID_DIRECTORY);
 174         return 0;
 175     }
 176
 177     s = dir;
 178     p = s;
 179     do {
 180         if ((*p == LIST_SEPARATOR_CHAR) || (*p == '\0')) {
 181             BY_DIR_ENTRY *ent;
 182
 183             ss = s;
 184             s = p + 1;
 185             len = p - ss;
 186             if (len == 0)
 187                 continue;
 188             for (j = 0; j < sk_BY_DIR_ENTRY_num(ctx->dirs); j++) {
 189                 ent = sk_BY_DIR_ENTRY_value(ctx->dirs, j);
 190                 if (strlen(ent->dir) == len && strncmp(ent->dir, ss, len) == 0)
 191                     break;
 192             }
 193             if (j < sk_BY_DIR_ENTRY_num(ctx->dirs))
 194                 continue;
 195             if (ctx->dirs == NULL) {
 196                 ctx->dirs = sk_BY_DIR_ENTRY_new_null();
 197                 if (!ctx->dirs) {
 198                     ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
 199                     return 0;
 200                 }
 201             }
 202             ent = OPENSSL_malloc(sizeof(*ent));
 203             if (ent == NULL)
 204                 return 0;
 205             ent->dir_type = type;
 206             ent->hashes = sk_BY_DIR_HASH_new(by_dir_hash_cmp);
 207             ent->dir = OPENSSL_strndup(ss, len);
 208             if (ent->dir == NULL || ent->hashes == NULL) {
 209                 by_dir_entry_free(ent);
 210                 return 0;
 211             }
 212             if (!sk_BY_DIR_ENTRY_push(ctx->dirs, ent)) {
 213                 by_dir_entry_free(ent);
 214                 ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
 215                 return 0;
 216             }
 217         }
 218     } while (*p++ != '\0');
 219     return 1;
 220 }
 221
 222 static int get_cert_by_subject_ex(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
 223                                   const X509_NAME *name, X509_OBJECT *ret,
 224                                   OSSL_LIB_CTX *libctx, const char *propq)
 225 {
 226     BY_DIR *ctx;
 227     union {
 228         X509 st_x509;
 229         X509_CRL crl;
 230     } data;
 231     int ok = 0;
 232     int i, j, k;
 233     unsigned long h;
 234     BUF_MEM *b = NULL;
 235     X509_OBJECT stmp, *tmp;
 236     const char *postfix = "";
 237
 238     if (name == NULL)
 239         return 0;
 240
 241     stmp.type = type;
 242     if (type == X509_LU_X509) {
 243         data.st_x509.cert_info.subject = (X509_NAME *)name; /* won't modify it */
 244         stmp.data.x509 = &data.st_x509;
 245     } else if (type == X509_LU_CRL) {
 246         data.crl.crl.issuer = (X509_NAME *)name; /* won't modify it */
 247         stmp.data.crl = &data.crl;
 248         postfix = "r";
 249     } else {
 250         ERR_raise(ERR_LIB_X509, X509_R_WRONG_LOOKUP_TYPE);
 251         goto finish;
 252     }
 253
 254     if ((b = BUF_MEM_new()) == NULL) {
 255         ERR_raise(ERR_LIB_X509, ERR_R_BUF_LIB);
 256         goto finish;
 257     }
 258
 259     ctx = (BY_DIR *)xl->method_data;
 260     h = X509_NAME_hash_ex(name, libctx, propq, &i);
 261     if (i == 0)
 262         goto finish;
 263     for (i = 0; i < sk_BY_DIR_ENTRY_num(ctx->dirs); i++) {
 264         BY_DIR_ENTRY *ent;
 265         int idx;
 266         BY_DIR_HASH htmp, *hent;
 267
 268         ent = sk_BY_DIR_ENTRY_value(ctx->dirs, i);
 269         j = strlen(ent->dir) + 1 + 8 + 6 + 1 + 1;
 270         if (!BUF_MEM_grow(b, j)) {
 271             ERR_raise(ERR_LIB_X509, ERR_R_BUF_LIB);
 272             goto finish;
 273         }
 274         if (type == X509_LU_CRL && ent->hashes) {
 275             htmp.hash = h;
 276             if (!CRYPTO_THREAD_read_lock(ctx->lock))
 277                 goto finish;
 278             idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 279             if (idx >= 0) {
 280                 hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 281                 k = hent->suffix;
 282             } else {
 283                 hent = NULL;
 284                 k = 0;
 285             }
 286             CRYPTO_THREAD_unlock(ctx->lock);
 287         } else {
 288             k = 0;
 289             hent = NULL;
 290         }
 291         for (;;) {
 292             char c = '/';
 293
 294 #ifdef OPENSSL_SYS_VMS
 295             c = ent->dir[strlen(ent->dir) - 1];
 296             if (c != ':' && c != '>' && c != ']') {
 297                 /*
 298                  * If no separator is present, we assume the directory
 299                  * specifier is a logical name, and add a colon.  We really
 300                  * should use better VMS routines for merging things like
 301                  * this, but this will do for now... -- Richard Levitte
 302                  */
 303                 c = ':';
 304             } else {
 305                 c = '\0';
 306             }
 307
 308             if (c == '\0') {
 309                 /*
 310                  * This is special.  When c == '\0', no directory separator
 311                  * should be added.
 312                  */
 313                 BIO_snprintf(b->data, b->max,
 314                              "%s%08lx.%s%d", ent->dir, h, postfix, k);
 315             } else
 316 #endif
 317             {
 318                 BIO_snprintf(b->data, b->max,
 319                              "%s%c%08lx.%s%d", ent->dir, c, h, postfix, k);
 320             }
 321 #ifndef OPENSSL_NO_POSIX_IO
 322 # ifdef _WIN32
 323 #  define stat _stat
 324 # endif
 325             {
 326                 struct stat st;
 327                 if (stat(b->data, &st) < 0)
 328                     break;
 329             }
 330 #endif
 331             /* found one. */
 332             if (type == X509_LU_X509) {
 333                 if ((X509_load_cert_file_ex(xl, b->data, ent->dir_type, libctx,
 334                                             propq)) == 0)
 335                     break;
 336             } else if (type == X509_LU_CRL) {
 337                 if ((X509_load_crl_file(xl, b->data, ent->dir_type)) == 0)
 338                     break;
 339             }
 340             /* else case will caught higher up */
 341             k++;
 342         }
 343
 344         /*
 345          * we have added it to the cache so now pull it out again
 346          *
 347          * Note: quadratic time find here since the objects won't generally be
 348          *       sorted and sorting the would result in O(n^2 log n) complexity.
 349          */
 350         if (k > 0) {
 351             if (!X509_STORE_lock(xl->store_ctx))
 352                 goto finish;
 353             j = sk_X509_OBJECT_find(xl->store_ctx->objs, &stmp);
 354             tmp = sk_X509_OBJECT_value(xl->store_ctx->objs, j);
 355             X509_STORE_unlock(xl->store_ctx);
 356         } else {
 357             tmp = NULL;
 358         }
 359         /*
 360          * If a CRL, update the last file suffix added for this.
 361          * We don't need to add an entry if k is 0 as this is the initial value.
 362          * This avoids the need for a write lock and sort operation in the
 363          * simple case where no CRL is present for a hash.
 364          */
 365         if (type == X509_LU_CRL && k > 0) {
 366             if (!CRYPTO_THREAD_write_lock(ctx->lock))
 367                 goto finish;
 368             /*
 369              * Look for entry again in case another thread added an entry
 370              * first.
 371              */
 372             if (hent == NULL) {
 373                 htmp.hash = h;
 374                 idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 375                 hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 376             }
 377             if (hent == NULL) {
 378                 hent = OPENSSL_malloc(sizeof(*hent));
 379                 if (hent == NULL) {
 380                     CRYPTO_THREAD_unlock(ctx->lock);
 381                     ok = 0;
 382                     goto finish;
 383                 }
 384                 hent->hash = h;
 385                 hent->suffix = k;
 386                 if (!sk_BY_DIR_HASH_push(ent->hashes, hent)) {
 387                     CRYPTO_THREAD_unlock(ctx->lock);
 388                     OPENSSL_free(hent);
 389                     ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
 390                     ok = 0;
 391                     goto finish;
 392                 }
 393
 394                 /*
 395                  * Ensure stack is sorted so that subsequent sk_BY_DIR_HASH_find
 396                  * will not mutate the stack and therefore require a write lock.
 397                  */
 398                 sk_BY_DIR_HASH_sort(ent->hashes);
 399             } else if (hent->suffix < k) {
 400                 hent->suffix = k;
 401             }
 402
 403             CRYPTO_THREAD_unlock(ctx->lock);
 404
 405         }
 406
 407         if (tmp != NULL) {
 408             ok = 1;
 409             ret->type = tmp->type;
 410             memcpy(&ret->data, &tmp->data, sizeof(ret->data));
 411
 412             /*
 413              * Clear any errors that might have been raised processing empty
 414              * or malformed files.
 415              */
 416             ERR_clear_error();
 417
 418             goto finish;
 419         }
 420     }
 421  finish:
 422     /* If we changed anything, resort the objects for faster lookup */
 423     if (X509_STORE_lock(xl->store_ctx)) {
 424         if (!sk_X509_OBJECT_is_sorted(xl->store_ctx->objs)) {
 425             sk_X509_OBJECT_sort(xl->store_ctx->objs);
 426         }
 427         X509_STORE_unlock(xl->store_ctx);
 428     }
 429
 430     BUF_MEM_free(b);
 431     return ok;
 432 }
 433
 434 static int get_cert_by_subject(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
 435                                const X509_NAME *name, X509_OBJECT *ret)
 436 {
 437     return get_cert_by_subject_ex(xl, type, name, ret, NULL, NULL);
 438 }