crypto/x509/by_dir.c

   1 /*
   2  * Copyright 1995-2018 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 "e_os.h"
  11 #include "internal/cryptlib.h"
  12 #include <stdio.h>
  13 #include <time.h>
  14 #include <errno.h>
  15 #include <sys/types.h>
  16
  17 #ifndef OPENSSL_NO_POSIX_IO
  18 # include <sys/stat.h>
  19 #endif
  20
  21 #include <openssl/x509.h>
  22 #include "crypto/x509.h"
  23 #include "x509_local.h"
  24
  25 struct lookup_dir_hashes_st {
  26     unsigned long hash;
  27     int suffix;
  28 };
  29
  30 struct lookup_dir_entry_st {
  31     char *dir;
  32     int dir_type;
  33     STACK_OF(BY_DIR_HASH) *hashes;
  34 };
  35
  36 typedef struct lookup_dir_st {
  37     BUF_MEM *buffer;
  38     STACK_OF(BY_DIR_ENTRY) *dirs;
  39     CRYPTO_RWLOCK *lock;
  40 } BY_DIR;
  41
  42 static int dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
  43                     char **ret);
  44 static int new_dir(X509_LOOKUP *lu);
  45 static void free_dir(X509_LOOKUP *lu);
  46 static int add_cert_dir(BY_DIR *ctx, const char *dir, int type);
  47 static int get_cert_by_subject(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
  48                                X509_NAME *name, X509_OBJECT *ret);
  49 static X509_LOOKUP_METHOD x509_dir_lookup = {
  50     "Load certs from files in a directory",
  51     new_dir,                    /* new_item */
  52     free_dir,                   /* free */
  53     NULL,                       /* init */
  54     NULL,                       /* shutdown */
  55     dir_ctrl,                   /* ctrl */
  56     get_cert_by_subject,        /* get_by_subject */
  57     NULL,                       /* get_by_issuer_serial */
  58     NULL,                       /* get_by_fingerprint */
  59     NULL,                       /* get_by_alias */
  60 };
  61
  62 X509_LOOKUP_METHOD *X509_LOOKUP_hash_dir(void)
  63 {
  64     return &x509_dir_lookup;
  65 }
  66
  67 static int dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
  68                     char **retp)
  69 {
  70     int ret = 0;
  71     BY_DIR *ld = (BY_DIR *)ctx->method_data;
  72
  73     switch (cmd) {
  74     case X509_L_ADD_DIR:
  75         if (argl == X509_FILETYPE_DEFAULT) {
  76             const char *dir = ossl_safe_getenv(X509_get_default_cert_dir_env());
  77
  78             if (dir)
  79                 ret = add_cert_dir(ld, dir, X509_FILETYPE_PEM);
  80             else
  81                 ret = add_cert_dir(ld, X509_get_default_cert_dir(),
  82                                    X509_FILETYPE_PEM);
  83             if (!ret) {
  84                 X509err(X509_F_DIR_CTRL, X509_R_LOADING_CERT_DIR);
  85             }
  86         } else
  87             ret = add_cert_dir(ld, argp, (int)argl);
  88         break;
  89     }
  90     return ret;
  91 }
  92
  93 static int new_dir(X509_LOOKUP *lu)
  94 {
  95     BY_DIR *a = OPENSSL_malloc(sizeof(*a));
  96
  97     if (a == NULL) {
  98         X509err(X509_F_NEW_DIR, ERR_R_MALLOC_FAILURE);
  99         return 0;
 100     }
 101
 102     if ((a->buffer = BUF_MEM_new()) == NULL) {
 103         X509err(X509_F_NEW_DIR, ERR_R_MALLOC_FAILURE);
 104         goto err;
 105     }
 106     a->dirs = NULL;
 107     a->lock = CRYPTO_THREAD_lock_new();
 108     if (a->lock == NULL) {
 109         BUF_MEM_free(a->buffer);
 110         X509err(X509_F_NEW_DIR, ERR_R_MALLOC_FAILURE);
 111         goto err;
 112     }
 113     lu->method_data = a;
 114     return 1;
 115
 116  err:
 117     OPENSSL_free(a);
 118     return 0;
 119 }
 120
 121 static void by_dir_hash_free(BY_DIR_HASH *hash)
 122 {
 123     OPENSSL_free(hash);
 124 }
 125
 126 static int by_dir_hash_cmp(const BY_DIR_HASH *const *a,
 127                            const BY_DIR_HASH *const *b)
 128 {
 129     if ((*a)->hash > (*b)->hash)
 130         return 1;
 131     if ((*a)->hash < (*b)->hash)
 132         return -1;
 133     return 0;
 134 }
 135
 136 static void by_dir_entry_free(BY_DIR_ENTRY *ent)
 137 {
 138     OPENSSL_free(ent->dir);
 139     sk_BY_DIR_HASH_pop_free(ent->hashes, by_dir_hash_free);
 140     OPENSSL_free(ent);
 141 }
 142
 143 static void free_dir(X509_LOOKUP *lu)
 144 {
 145     BY_DIR *a = (BY_DIR *)lu->method_data;
 146
 147     sk_BY_DIR_ENTRY_pop_free(a->dirs, by_dir_entry_free);
 148     BUF_MEM_free(a->buffer);
 149     CRYPTO_THREAD_lock_free(a->lock);
 150     OPENSSL_free(a);
 151 }
 152
 153 static int add_cert_dir(BY_DIR *ctx, const char *dir, int type)
 154 {
 155     int j;
 156     size_t len;
 157     const char *s, *ss, *p;
 158
 159     if (dir == NULL || !*dir) {
 160         X509err(X509_F_ADD_CERT_DIR, X509_R_INVALID_DIRECTORY);
 161         return 0;
 162     }
 163
 164     s = dir;
 165     p = s;
 166     do {
 167         if ((*p == LIST_SEPARATOR_CHAR) || (*p == '\0')) {
 168             BY_DIR_ENTRY *ent;
 169
 170             ss = s;
 171             s = p + 1;
 172             len = p - ss;
 173             if (len == 0)
 174                 continue;
 175             for (j = 0; j < sk_BY_DIR_ENTRY_num(ctx->dirs); j++) {
 176                 ent = sk_BY_DIR_ENTRY_value(ctx->dirs, j);
 177                 if (strlen(ent->dir) == len && strncmp(ent->dir, ss, len) == 0)
 178                     break;
 179             }
 180             if (j < sk_BY_DIR_ENTRY_num(ctx->dirs))
 181                 continue;
 182             if (ctx->dirs == NULL) {
 183                 ctx->dirs = sk_BY_DIR_ENTRY_new_null();
 184                 if (!ctx->dirs) {
 185                     X509err(X509_F_ADD_CERT_DIR, ERR_R_MALLOC_FAILURE);
 186                     return 0;
 187                 }
 188             }
 189             ent = OPENSSL_malloc(sizeof(*ent));
 190             if (ent == NULL) {
 191                 X509err(X509_F_ADD_CERT_DIR, ERR_R_MALLOC_FAILURE);
 192                 return 0;
 193             }
 194             ent->dir_type = type;
 195             ent->hashes = sk_BY_DIR_HASH_new(by_dir_hash_cmp);
 196             ent->dir = OPENSSL_strndup(ss, len);
 197             if (ent->dir == NULL || ent->hashes == NULL) {
 198                 by_dir_entry_free(ent);
 199                 return 0;
 200             }
 201             if (!sk_BY_DIR_ENTRY_push(ctx->dirs, ent)) {
 202                 by_dir_entry_free(ent);
 203                 X509err(X509_F_ADD_CERT_DIR, ERR_R_MALLOC_FAILURE);
 204                 return 0;
 205             }
 206         }
 207     } while (*p++ != '\0');
 208     return 1;
 209 }
 210
 211 static int get_cert_by_subject(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
 212                                X509_NAME *name, X509_OBJECT *ret)
 213 {
 214     BY_DIR *ctx;
 215     union {
 216         X509 st_x509;
 217         X509_CRL crl;
 218     } data;
 219     int ok = 0;
 220     int i, j, k;
 221     unsigned long h;
 222     BUF_MEM *b = NULL;
 223     X509_OBJECT stmp, *tmp;
 224     const char *postfix = "";
 225
 226     if (name == NULL)
 227         return 0;
 228
 229     stmp.type = type;
 230     if (type == X509_LU_X509) {
 231         data.st_x509.cert_info.subject = name;
 232         stmp.data.x509 = &data.st_x509;
 233         postfix = "";
 234     } else if (type == X509_LU_CRL) {
 235         data.crl.crl.issuer = name;
 236         stmp.data.crl = &data.crl;
 237         postfix = "r";
 238     } else {
 239         X509err(X509_F_GET_CERT_BY_SUBJECT, X509_R_WRONG_LOOKUP_TYPE);
 240         goto finish;
 241     }
 242
 243     if ((b = BUF_MEM_new()) == NULL) {
 244         X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_BUF_LIB);
 245         goto finish;
 246     }
 247
 248     ctx = (BY_DIR *)xl->method_data;
 249
 250     h = X509_NAME_hash(name);
 251     for (i = 0; i < sk_BY_DIR_ENTRY_num(ctx->dirs); i++) {
 252         BY_DIR_ENTRY *ent;
 253         int idx;
 254         BY_DIR_HASH htmp, *hent;
 255
 256         ent = sk_BY_DIR_ENTRY_value(ctx->dirs, i);
 257         j = strlen(ent->dir) + 1 + 8 + 6 + 1 + 1;
 258         if (!BUF_MEM_grow(b, j)) {
 259             X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_MALLOC_FAILURE);
 260             goto finish;
 261         }
 262         if (type == X509_LU_CRL && ent->hashes) {
 263             htmp.hash = h;
 264             CRYPTO_THREAD_read_lock(ctx->lock);
 265             idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 266             if (idx >= 0) {
 267                 hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 268                 k = hent->suffix;
 269             } else {
 270                 hent = NULL;
 271                 k = 0;
 272             }
 273             CRYPTO_THREAD_unlock(ctx->lock);
 274         } else {
 275             k = 0;
 276             hent = NULL;
 277         }
 278         for (;;) {
 279             char c = '/';
 280 #ifdef OPENSSL_SYS_VMS
 281             c = ent->dir[strlen(ent->dir) - 1];
 282             if (c != ':' && c != '>' && c != ']') {
 283                 /*
 284                  * If no separator is present, we assume the directory
 285                  * specifier is a logical name, and add a colon.  We really
 286                  * should use better VMS routines for merging things like
 287                  * this, but this will do for now... -- Richard Levitte
 288                  */
 289                 c = ':';
 290             } else {
 291                 c = '\0';
 292             }
 293 #endif
 294             if (c == '\0') {
 295                 /*
 296                  * This is special.  When c == '\0', no directory separator
 297                  * should be added.
 298                  */
 299                 BIO_snprintf(b->data, b->max,
 300                              "%s%08lx.%s%d", ent->dir, h, postfix, k);
 301             } else {
 302                 BIO_snprintf(b->data, b->max,
 303                              "%s%c%08lx.%s%d", ent->dir, c, h, postfix, k);
 304             }
 305 #ifndef OPENSSL_NO_POSIX_IO
 306 # ifdef _WIN32
 307 #  define stat _stat
 308 # endif
 309             {
 310                 struct stat st;
 311                 if (stat(b->data, &st) < 0)
 312                     break;
 313             }
 314 #endif
 315             /* found one. */
 316             if (type == X509_LU_X509) {
 317                 if ((X509_load_cert_file(xl, b->data, ent->dir_type)) == 0)
 318                     break;
 319             } else if (type == X509_LU_CRL) {
 320                 if ((X509_load_crl_file(xl, b->data, ent->dir_type)) == 0)
 321                     break;
 322             }
 323             /* else case will caught higher up */
 324             k++;
 325         }
 326
 327         /*
 328          * we have added it to the cache so now pull it out again
 329          */
 330         X509_STORE_lock(xl->store_ctx);
 331         j = sk_X509_OBJECT_find(xl->store_ctx->objs, &stmp);
 332         tmp = sk_X509_OBJECT_value(xl->store_ctx->objs, j);
 333         X509_STORE_unlock(xl->store_ctx);
 334
 335         /* If a CRL, update the last file suffix added for this */
 336
 337         if (type == X509_LU_CRL) {
 338             CRYPTO_THREAD_write_lock(ctx->lock);
 339             /*
 340              * Look for entry again in case another thread added an entry
 341              * first.
 342              */
 343             if (hent == NULL) {
 344                 htmp.hash = h;
 345                 idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 346                 hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 347             }
 348             if (hent == NULL) {
 349                 hent = OPENSSL_malloc(sizeof(*hent));
 350                 if (hent == NULL) {
 351                     CRYPTO_THREAD_unlock(ctx->lock);
 352                     X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_MALLOC_FAILURE);
 353                     ok = 0;
 354                     goto finish;
 355                 }
 356                 hent->hash = h;
 357                 hent->suffix = k;
 358                 if (!sk_BY_DIR_HASH_push(ent->hashes, hent)) {
 359                     CRYPTO_THREAD_unlock(ctx->lock);
 360                     OPENSSL_free(hent);
 361                     X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_MALLOC_FAILURE);
 362                     ok = 0;
 363                     goto finish;
 364                 }
 365             } else if (hent->suffix < k) {
 366                 hent->suffix = k;
 367             }
 368
 369             CRYPTO_THREAD_unlock(ctx->lock);
 370
 371         }
 372
 373         if (tmp != NULL) {
 374             ok = 1;
 375             ret->type = tmp->type;
 376             memcpy(&ret->data, &tmp->data, sizeof(ret->data));
 377
 378             /*
 379              * Clear any errors that might have been raised processing empty
 380              * or malformed files.
 381              */
 382             ERR_clear_error();
 383
 384             goto finish;
 385         }
 386     }
 387  finish:
 388     BUF_MEM_free(b);
 389     return ok;
 390 }