crypto/x509/by_dir.c

   1 /*
   2  * Copyright 1995-2017 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 "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 "internal/x509_int.h"
  23 #include "x509_lcl.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 */
  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;
  72     char *dir = NULL;
  73
  74     ld = (BY_DIR *)ctx->method_data;
  75
  76     switch (cmd) {
  77     case X509_L_ADD_DIR:
  78         if (argl == X509_FILETYPE_DEFAULT) {
  79             dir = (char *)getenv(X509_get_default_cert_dir_env());
  80             if (dir)
  81                 ret = add_cert_dir(ld, dir, X509_FILETYPE_PEM);
  82             else
  83                 ret = add_cert_dir(ld, X509_get_default_cert_dir(),
  84                                    X509_FILETYPE_PEM);
  85             if (!ret) {
  86                 X509err(X509_F_DIR_CTRL, X509_R_LOADING_CERT_DIR);
  87             }
  88         } else
  89             ret = add_cert_dir(ld, argp, (int)argl);
  90         break;
  91     }
  92     return (ret);
  93 }
  94
  95 static int new_dir(X509_LOOKUP *lu)
  96 {
  97     BY_DIR *a;
  98
  99     if ((a = OPENSSL_malloc(sizeof(*a))) == NULL)
 100         return 0;
 101     if ((a->buffer = BUF_MEM_new()) == NULL) {
 102         OPENSSL_free(a);
 103         return 0;
 104     }
 105     a->dirs = NULL;
 106     a->lock = CRYPTO_THREAD_lock_new();
 107     if (a->lock == NULL) {
 108         BUF_MEM_free(a->buffer);
 109         OPENSSL_free(a);
 110         return 0;
 111     }
 112     lu->method_data = (char *)a;
 113     return 1;
 114 }
 115
 116 static void by_dir_hash_free(BY_DIR_HASH *hash)
 117 {
 118     OPENSSL_free(hash);
 119 }
 120
 121 static int by_dir_hash_cmp(const BY_DIR_HASH *const *a,
 122                            const BY_DIR_HASH *const *b)
 123 {
 124     if ((*a)->hash > (*b)->hash)
 125         return 1;
 126     if ((*a)->hash < (*b)->hash)
 127         return -1;
 128     return 0;
 129 }
 130
 131 static void by_dir_entry_free(BY_DIR_ENTRY *ent)
 132 {
 133     OPENSSL_free(ent->dir);
 134     sk_BY_DIR_HASH_pop_free(ent->hashes, by_dir_hash_free);
 135     OPENSSL_free(ent);
 136 }
 137
 138 static void free_dir(X509_LOOKUP *lu)
 139 {
 140     BY_DIR *a;
 141
 142     a = (BY_DIR *)lu->method_data;
 143     sk_BY_DIR_ENTRY_pop_free(a->dirs, by_dir_entry_free);
 144     BUF_MEM_free(a->buffer);
 145     CRYPTO_THREAD_lock_free(a->lock);
 146     OPENSSL_free(a);
 147 }
 148
 149 static int add_cert_dir(BY_DIR *ctx, const char *dir, int type)
 150 {
 151     int j;
 152     size_t len;
 153     const char *s, *ss, *p;
 154
 155     if (dir == NULL || !*dir) {
 156         X509err(X509_F_ADD_CERT_DIR, X509_R_INVALID_DIRECTORY);
 157         return 0;
 158     }
 159
 160     s = dir;
 161     p = s;
 162     do {
 163         if ((*p == LIST_SEPARATOR_CHAR) || (*p == '\0')) {
 164             BY_DIR_ENTRY *ent;
 165             ss = s;
 166             s = p + 1;
 167             len = p - ss;
 168             if (len == 0)
 169                 continue;
 170             for (j = 0; j < sk_BY_DIR_ENTRY_num(ctx->dirs); j++) {
 171                 ent = sk_BY_DIR_ENTRY_value(ctx->dirs, j);
 172                 if (strlen(ent->dir) == len && strncmp(ent->dir, ss, len) == 0)
 173                     break;
 174             }
 175             if (j < sk_BY_DIR_ENTRY_num(ctx->dirs))
 176                 continue;
 177             if (ctx->dirs == NULL) {
 178                 ctx->dirs = sk_BY_DIR_ENTRY_new_null();
 179                 if (!ctx->dirs) {
 180                     X509err(X509_F_ADD_CERT_DIR, ERR_R_MALLOC_FAILURE);
 181                     return 0;
 182                 }
 183             }
 184             ent = OPENSSL_malloc(sizeof(*ent));
 185             if (ent == NULL)
 186                 return 0;
 187             ent->dir_type = type;
 188             ent->hashes = sk_BY_DIR_HASH_new(by_dir_hash_cmp);
 189             ent->dir = OPENSSL_strndup(ss, len);
 190             if (ent->dir == NULL || ent->hashes == NULL) {
 191                 by_dir_entry_free(ent);
 192                 return 0;
 193             }
 194             if (!sk_BY_DIR_ENTRY_push(ctx->dirs, ent)) {
 195                 by_dir_entry_free(ent);
 196                 return 0;
 197             }
 198         }
 199     } while (*p++ != '\0');
 200     return 1;
 201 }
 202
 203 static int get_cert_by_subject(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
 204                                X509_NAME *name, X509_OBJECT *ret)
 205 {
 206     BY_DIR *ctx;
 207     union {
 208         X509 st_x509;
 209         X509_CRL crl;
 210     } data;
 211     int ok = 0;
 212     int i, j, k;
 213     unsigned long h;
 214     BUF_MEM *b = NULL;
 215     X509_OBJECT stmp, *tmp;
 216     const char *postfix = "";
 217
 218     if (name == NULL)
 219         return (0);
 220
 221     stmp.type = type;
 222     if (type == X509_LU_X509) {
 223         data.st_x509.cert_info.subject = name;
 224         stmp.data.x509 = &data.st_x509;
 225         postfix = "";
 226     } else if (type == X509_LU_CRL) {
 227         data.crl.crl.issuer = name;
 228         stmp.data.crl = &data.crl;
 229         postfix = "r";
 230     } else {
 231         X509err(X509_F_GET_CERT_BY_SUBJECT, X509_R_WRONG_LOOKUP_TYPE);
 232         goto finish;
 233     }
 234
 235     if ((b = BUF_MEM_new()) == NULL) {
 236         X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_BUF_LIB);
 237         goto finish;
 238     }
 239
 240     ctx = (BY_DIR *)xl->method_data;
 241
 242     h = X509_NAME_hash(name);
 243     for (i = 0; i < sk_BY_DIR_ENTRY_num(ctx->dirs); i++) {
 244         BY_DIR_ENTRY *ent;
 245         int idx;
 246         BY_DIR_HASH htmp, *hent;
 247         ent = sk_BY_DIR_ENTRY_value(ctx->dirs, i);
 248         j = strlen(ent->dir) + 1 + 8 + 6 + 1 + 1;
 249         if (!BUF_MEM_grow(b, j)) {
 250             X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_MALLOC_FAILURE);
 251             goto finish;
 252         }
 253         if (type == X509_LU_CRL && ent->hashes) {
 254             htmp.hash = h;
 255             CRYPTO_THREAD_read_lock(ctx->lock);
 256             idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 257             if (idx >= 0) {
 258                 hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 259                 k = hent->suffix;
 260             } else {
 261                 hent = NULL;
 262                 k = 0;
 263             }
 264             CRYPTO_THREAD_unlock(ctx->lock);
 265         } else {
 266             k = 0;
 267             hent = NULL;
 268         }
 269         for (;;) {
 270             char c = '/';
 271 #ifdef OPENSSL_SYS_VMS
 272             c = ent->dir[strlen(ent->dir) - 1];
 273             if (c != ':' && c != '>' && c != ']') {
 274                 /*
 275                  * If no separator is present, we assume the directory
 276                  * specifier is a logical name, and add a colon.  We really
 277                  * should use better VMS routines for merging things like
 278                  * this, but this will do for now... -- Richard Levitte
 279                  */
 280                 c = ':';
 281             } else {
 282                 c = '\0';
 283             }
 284 #endif
 285             if (c == '\0') {
 286                 /*
 287                  * This is special.  When c == '\0', no directory separator
 288                  * should be added.
 289                  */
 290                 BIO_snprintf(b->data, b->max,
 291                              "%s%08lx.%s%d", ent->dir, h, postfix, k);
 292             } else {
 293                 BIO_snprintf(b->data, b->max,
 294                              "%s%c%08lx.%s%d", ent->dir, c, h, postfix, k);
 295             }
 296 #ifndef OPENSSL_NO_POSIX_IO
 297 # ifdef _WIN32
 298 #  define stat _stat
 299 # endif
 300             {
 301                 struct stat st;
 302                 if (stat(b->data, &st) < 0)
 303                     break;
 304             }
 305 #endif
 306             /* found one. */
 307             if (type == X509_LU_X509) {
 308                 if ((X509_load_cert_file(xl, b->data, ent->dir_type)) == 0)
 309                     break;
 310             } else if (type == X509_LU_CRL) {
 311                 if ((X509_load_crl_file(xl, b->data, ent->dir_type)) == 0)
 312                     break;
 313             }
 314             /* else case will caught higher up */
 315             k++;
 316         }
 317
 318         /*
 319          * we have added it to the cache so now pull it out again
 320          */
 321         CRYPTO_THREAD_write_lock(ctx->lock);
 322         j = sk_X509_OBJECT_find(xl->store_ctx->objs, &stmp);
 323         if (j != -1)
 324             tmp = sk_X509_OBJECT_value(xl->store_ctx->objs, j);
 325         else
 326             tmp = NULL;
 327         CRYPTO_THREAD_unlock(ctx->lock);
 328
 329         /* If a CRL, update the last file suffix added for this */
 330
 331         if (type == X509_LU_CRL) {
 332             CRYPTO_THREAD_write_lock(ctx->lock);
 333             /*
 334              * Look for entry again in case another thread added an entry
 335              * first.
 336              */
 337             if (!hent) {
 338                 htmp.hash = h;
 339                 idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 340                 if (idx >= 0)
 341                     hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 342             }
 343             if (!hent) {
 344                 hent = OPENSSL_malloc(sizeof(*hent));
 345                 if (hent == NULL) {
 346                     CRYPTO_THREAD_unlock(ctx->lock);
 347                     X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_MALLOC_FAILURE);
 348                     ok = 0;
 349                     goto finish;
 350                 }
 351                 hent->hash = h;
 352                 hent->suffix = k;
 353                 if (!sk_BY_DIR_HASH_push(ent->hashes, hent)) {
 354                     CRYPTO_THREAD_unlock(ctx->lock);
 355                     OPENSSL_free(hent);
 356                     ok = 0;
 357                     goto finish;
 358                 }
 359             } else if (hent->suffix < k) {
 360                 hent->suffix = k;
 361             }
 362
 363             CRYPTO_THREAD_unlock(ctx->lock);
 364
 365         }
 366
 367         if (tmp != NULL) {
 368             ok = 1;
 369             ret->type = tmp->type;
 370             memcpy(&ret->data, &tmp->data, sizeof(ret->data));
 371
 372             /*
 373              * Clear any errors that might have been raised processing empty
 374              * or malformed files.
 375              */
 376             ERR_clear_error();
 377
 378             /*
 379              * If we were going to up the reference count, we would need to
 380              * do it on a perl 'type' basis
 381              */
 382         /*- CRYPTO_add(&tmp->data.x509->references,1,
 383                     CRYPTO_LOCK_X509);*/
 384             goto finish;
 385         }
 386     }
 387  finish:
 388     BUF_MEM_free(b);
 389     return (ok);
 390 }