crypto/x509/by_dir.c

   1 /* crypto/x509/by_dir.c */
   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 <stdio.h>
  60 #include <time.h>
  61 #include <errno.h>
  62
  63 #include "internal/cryptlib.h"
  64
  65 #ifndef NO_SYS_TYPES_H
  66 # include <sys/types.h>
  67 #endif
  68 #ifndef OPENSSL_NO_POSIX_IO
  69 # include <sys/stat.h>
  70 #endif
  71
  72
  73 #include <openssl/lhash.h>
  74 #include <openssl/x509.h>
  75 #include "internal/x509_int.h"
  76 #include "x509_lcl.h"
  77
  78 struct lookup_dir_hashes_st {
  79     unsigned long hash;
  80     int suffix;
  81 };
  82
  83 struct lookup_dir_entry_st {
  84     char *dir;
  85     int dir_type;
  86     STACK_OF(BY_DIR_HASH) *hashes;
  87 };
  88
  89 typedef struct lookup_dir_st {
  90     BUF_MEM *buffer;
  91     STACK_OF(BY_DIR_ENTRY) *dirs;
  92 } BY_DIR;
  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 static X509_LOOKUP_METHOD x509_dir_lookup = {
 102     "Load certs from files in a directory",
 103     new_dir,                    /* new */
 104     free_dir,                   /* free */
 105     NULL,                       /* init */
 106     NULL,                       /* shutdown */
 107     dir_ctrl,                   /* ctrl */
 108     get_cert_by_subject,        /* get_by_subject */
 109     NULL,                       /* get_by_issuer_serial */
 110     NULL,                       /* get_by_fingerprint */
 111     NULL,                       /* get_by_alias */
 112 };
 113
 114 X509_LOOKUP_METHOD *X509_LOOKUP_hash_dir(void)
 115 {
 116     return (&x509_dir_lookup);
 117 }
 118
 119 static int dir_ctrl(X509_LOOKUP *ctx, int cmd, const char *argp, long argl,
 120                     char **retp)
 121 {
 122     int ret = 0;
 123     BY_DIR *ld;
 124     char *dir = NULL;
 125
 126     ld = (BY_DIR *)ctx->method_data;
 127
 128     switch (cmd) {
 129     case X509_L_ADD_DIR:
 130         if (argl == X509_FILETYPE_DEFAULT) {
 131             dir = (char *)getenv(X509_get_default_cert_dir_env());
 132             if (dir)
 133                 ret = add_cert_dir(ld, dir, X509_FILETYPE_PEM);
 134             else
 135                 ret = add_cert_dir(ld, X509_get_default_cert_dir(),
 136                                    X509_FILETYPE_PEM);
 137             if (!ret) {
 138                 X509err(X509_F_DIR_CTRL, X509_R_LOADING_CERT_DIR);
 139             }
 140         } else
 141             ret = add_cert_dir(ld, argp, (int)argl);
 142         break;
 143     }
 144     return (ret);
 145 }
 146
 147 static int new_dir(X509_LOOKUP *lu)
 148 {
 149     BY_DIR *a;
 150
 151     if ((a = OPENSSL_malloc(sizeof(*a))) == NULL)
 152         return (0);
 153     if ((a->buffer = BUF_MEM_new()) == NULL) {
 154         OPENSSL_free(a);
 155         return (0);
 156     }
 157     a->dirs = NULL;
 158     lu->method_data = (char *)a;
 159     return (1);
 160 }
 161
 162 static void by_dir_hash_free(BY_DIR_HASH *hash)
 163 {
 164     OPENSSL_free(hash);
 165 }
 166
 167 static int by_dir_hash_cmp(const BY_DIR_HASH *const *a,
 168                            const BY_DIR_HASH *const *b)
 169 {
 170     if ((*a)->hash > (*b)->hash)
 171         return 1;
 172     if ((*a)->hash < (*b)->hash)
 173         return -1;
 174     return 0;
 175 }
 176
 177 static void by_dir_entry_free(BY_DIR_ENTRY *ent)
 178 {
 179     OPENSSL_free(ent->dir);
 180     sk_BY_DIR_HASH_pop_free(ent->hashes, by_dir_hash_free);
 181     OPENSSL_free(ent);
 182 }
 183
 184 static void free_dir(X509_LOOKUP *lu)
 185 {
 186     BY_DIR *a;
 187
 188     a = (BY_DIR *)lu->method_data;
 189     sk_BY_DIR_ENTRY_pop_free(a->dirs, by_dir_entry_free);
 190     BUF_MEM_free(a->buffer);
 191     OPENSSL_free(a);
 192 }
 193
 194 static int add_cert_dir(BY_DIR *ctx, const char *dir, int type)
 195 {
 196     int j, len;
 197     const char *s, *ss, *p;
 198
 199     if (dir == NULL || !*dir) {
 200         X509err(X509_F_ADD_CERT_DIR, X509_R_INVALID_DIRECTORY);
 201         return 0;
 202     }
 203
 204     s = dir;
 205     p = s;
 206     do {
 207         if ((*p == LIST_SEPARATOR_CHAR) || (*p == '\0')) {
 208             BY_DIR_ENTRY *ent;
 209             ss = s;
 210             s = p + 1;
 211             len = (int)(p - ss);
 212             if (len == 0)
 213                 continue;
 214             for (j = 0; j < sk_BY_DIR_ENTRY_num(ctx->dirs); j++) {
 215                 ent = sk_BY_DIR_ENTRY_value(ctx->dirs, j);
 216                 if (strlen(ent->dir) == (size_t)len &&
 217                     strncmp(ent->dir, ss, (unsigned int)len) == 0)
 218                     break;
 219             }
 220             if (j < sk_BY_DIR_ENTRY_num(ctx->dirs))
 221                 continue;
 222             if (ctx->dirs == NULL) {
 223                 ctx->dirs = sk_BY_DIR_ENTRY_new_null();
 224                 if (!ctx->dirs) {
 225                     X509err(X509_F_ADD_CERT_DIR, ERR_R_MALLOC_FAILURE);
 226                     return 0;
 227                 }
 228             }
 229             ent = OPENSSL_malloc(sizeof(*ent));
 230             if (ent == NULL)
 231                 return 0;
 232             ent->dir_type = type;
 233             ent->hashes = sk_BY_DIR_HASH_new(by_dir_hash_cmp);
 234             ent->dir = OPENSSL_malloc((unsigned int)len + 1);
 235             if (ent->dir == NULL || ent->hashes == NULL) {
 236                 by_dir_entry_free(ent);
 237                 return 0;
 238             }
 239             strncpy(ent->dir, ss, (unsigned int)len);
 240             ent->dir[len] = '\0';
 241             if (!sk_BY_DIR_ENTRY_push(ctx->dirs, ent)) {
 242                 by_dir_entry_free(ent);
 243                 return 0;
 244             }
 245         }
 246     } while (*p++ != '\0');
 247     return 1;
 248 }
 249
 250 static int get_cert_by_subject(X509_LOOKUP *xl, X509_LOOKUP_TYPE type,
 251                                X509_NAME *name, X509_OBJECT *ret)
 252 {
 253     BY_DIR *ctx;
 254     union {
 255         X509 st_x509;
 256         X509_CRL crl;
 257     } data;
 258     int ok = 0;
 259     int i, j, k;
 260     unsigned long h;
 261     BUF_MEM *b = NULL;
 262     X509_OBJECT stmp, *tmp;
 263     const char *postfix = "";
 264
 265     if (name == NULL)
 266         return (0);
 267
 268     stmp.type = type;
 269     if (type == X509_LU_X509) {
 270         data.st_x509.cert_info.subject = name;
 271         stmp.data.x509 = &data.st_x509;
 272         postfix = "";
 273     } else if (type == X509_LU_CRL) {
 274         data.crl.crl.issuer = name;
 275         stmp.data.crl = &data.crl;
 276         postfix = "r";
 277     } else {
 278         X509err(X509_F_GET_CERT_BY_SUBJECT, X509_R_WRONG_LOOKUP_TYPE);
 279         goto finish;
 280     }
 281
 282     if ((b = BUF_MEM_new()) == NULL) {
 283         X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_BUF_LIB);
 284         goto finish;
 285     }
 286
 287     ctx = (BY_DIR *)xl->method_data;
 288
 289     h = X509_NAME_hash(name);
 290     for (i = 0; i < sk_BY_DIR_ENTRY_num(ctx->dirs); i++) {
 291         BY_DIR_ENTRY *ent;
 292         int idx;
 293         BY_DIR_HASH htmp, *hent;
 294         ent = sk_BY_DIR_ENTRY_value(ctx->dirs, i);
 295         j = strlen(ent->dir) + 1 + 8 + 6 + 1 + 1;
 296         if (!BUF_MEM_grow(b, j)) {
 297             X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_MALLOC_FAILURE);
 298             goto finish;
 299         }
 300         if (type == X509_LU_CRL && ent->hashes) {
 301             htmp.hash = h;
 302             CRYPTO_r_lock(CRYPTO_LOCK_X509_STORE);
 303             idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 304             if (idx >= 0) {
 305                 hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 306                 k = hent->suffix;
 307             } else {
 308                 hent = NULL;
 309                 k = 0;
 310             }
 311             CRYPTO_r_unlock(CRYPTO_LOCK_X509_STORE);
 312         } else {
 313             k = 0;
 314             hent = NULL;
 315         }
 316         for (;;) {
 317             char c = '/';
 318 #ifdef OPENSSL_SYS_VMS
 319             c = ent->dir[strlen(ent->dir) - 1];
 320             if (c != ':' && c != '>' && c != ']') {
 321                 /*
 322                  * If no separator is present, we assume the directory
 323                  * specifier is a logical name, and add a colon.  We really
 324                  * should use better VMS routines for merging things like
 325                  * this, but this will do for now... -- Richard Levitte
 326                  */
 327                 c = ':';
 328             } else {
 329                 c = '\0';
 330             }
 331 #endif
 332             if (c == '\0') {
 333                 /*
 334                  * This is special.  When c == '\0', no directory separator
 335                  * should be added.
 336                  */
 337                 BIO_snprintf(b->data, b->max,
 338                              "%s%08lx.%s%d", ent->dir, h, postfix, k);
 339             } else {
 340                 BIO_snprintf(b->data, b->max,
 341                              "%s%c%08lx.%s%d", ent->dir, c, h, postfix, k);
 342             }
 343 #ifndef OPENSSL_NO_POSIX_IO
 344 # ifdef _WIN32
 345 #  define stat _stat
 346 # endif
 347             {
 348                 struct stat st;
 349                 if (stat(b->data, &st) < 0)
 350                     break;
 351             }
 352 #endif
 353             /* found one. */
 354             if (type == X509_LU_X509) {
 355                 if ((X509_load_cert_file(xl, b->data, ent->dir_type)) == 0)
 356                     break;
 357             } else if (type == X509_LU_CRL) {
 358                 if ((X509_load_crl_file(xl, b->data, ent->dir_type)) == 0)
 359                     break;
 360             }
 361             /* else case will caught higher up */
 362             k++;
 363         }
 364
 365         /*
 366          * we have added it to the cache so now pull it out again
 367          */
 368         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 369         j = sk_X509_OBJECT_find(xl->store_ctx->objs, &stmp);
 370         if (j != -1)
 371             tmp = sk_X509_OBJECT_value(xl->store_ctx->objs, j);
 372         else
 373             tmp = NULL;
 374         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 375
 376         /* If a CRL, update the last file suffix added for this */
 377
 378         if (type == X509_LU_CRL) {
 379             CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 380             /*
 381              * Look for entry again in case another thread added an entry
 382              * first.
 383              */
 384             if (!hent) {
 385                 htmp.hash = h;
 386                 idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 387                 if (idx >= 0)
 388                     hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 389             }
 390             if (!hent) {
 391                 hent = OPENSSL_malloc(sizeof(*hent));
 392                 if (hent == NULL) {
 393                     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 394                     X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_MALLOC_FAILURE);
 395                     ok = 0;
 396                     goto finish;
 397                 }
 398                 hent->hash = h;
 399                 hent->suffix = k;
 400                 if (!sk_BY_DIR_HASH_push(ent->hashes, hent)) {
 401                     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 402                     OPENSSL_free(hent);
 403                     ok = 0;
 404                     goto finish;
 405                 }
 406             } else if (hent->suffix < k)
 407                 hent->suffix = k;
 408
 409             CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 410
 411         }
 412
 413         if (tmp != NULL) {
 414             ok = 1;
 415             ret->type = tmp->type;
 416             memcpy(&ret->data, &tmp->data, sizeof(ret->data));
 417             /*
 418              * If we were going to up the reference count, we would need to
 419              * do it on a perl 'type' basis
 420              */
 421         /*- CRYPTO_add(&tmp->data.x509->references,1,
 422                     CRYPTO_LOCK_X509);*/
 423             goto finish;
 424         }
 425     }
 426  finish:
 427     BUF_MEM_free(b);
 428     return (ok);
 429 }