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 "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 #include <openssl/lhash.h>
  73 #include <openssl/x509.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 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(BY_DIR))) == 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(BY_DIR_ENTRY));
 230             if (!ent)
 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 || !ent->hashes) {
 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, int type, X509_NAME *name,
 251                                X509_OBJECT *ret)
 252 {
 253     BY_DIR *ctx;
 254     union {
 255         struct {
 256             X509 st_x509;
 257             X509_CINF st_x509_cinf;
 258         } x509;
 259         struct {
 260             X509_CRL st_crl;
 261             X509_CRL_INFO st_crl_info;
 262         } crl;
 263     } data;
 264     int ok = 0;
 265     int i, j, k;
 266     unsigned long h;
 267     BUF_MEM *b = NULL;
 268     X509_OBJECT stmp, *tmp;
 269     const char *postfix = "";
 270
 271     if (name == NULL)
 272         return (0);
 273
 274     stmp.type = type;
 275     if (type == X509_LU_X509) {
 276         data.x509.st_x509.cert_info = &data.x509.st_x509_cinf;
 277         data.x509.st_x509_cinf.subject = name;
 278         stmp.data.x509 = &data.x509.st_x509;
 279         postfix = "";
 280     } else if (type == X509_LU_CRL) {
 281         data.crl.st_crl.crl = &data.crl.st_crl_info;
 282         data.crl.st_crl_info.issuer = name;
 283         stmp.data.crl = &data.crl.st_crl;
 284         postfix = "r";
 285     } else {
 286         X509err(X509_F_GET_CERT_BY_SUBJECT, X509_R_WRONG_LOOKUP_TYPE);
 287         goto finish;
 288     }
 289
 290     if ((b = BUF_MEM_new()) == NULL) {
 291         X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_BUF_LIB);
 292         goto finish;
 293     }
 294
 295     ctx = (BY_DIR *)xl->method_data;
 296
 297     h = X509_NAME_hash(name);
 298     for (i = 0; i < sk_BY_DIR_ENTRY_num(ctx->dirs); i++) {
 299         BY_DIR_ENTRY *ent;
 300         int idx;
 301         BY_DIR_HASH htmp, *hent;
 302         ent = sk_BY_DIR_ENTRY_value(ctx->dirs, i);
 303         j = strlen(ent->dir) + 1 + 8 + 6 + 1 + 1;
 304         if (!BUF_MEM_grow(b, j)) {
 305             X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_MALLOC_FAILURE);
 306             goto finish;
 307         }
 308         if (type == X509_LU_CRL && ent->hashes) {
 309             htmp.hash = h;
 310             CRYPTO_r_lock(CRYPTO_LOCK_X509_STORE);
 311             idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 312             if (idx >= 0) {
 313                 hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 314                 k = hent->suffix;
 315             } else {
 316                 hent = NULL;
 317                 k = 0;
 318             }
 319             CRYPTO_r_unlock(CRYPTO_LOCK_X509_STORE);
 320         } else {
 321             k = 0;
 322             hent = NULL;
 323         }
 324         for (;;) {
 325             char c = '/';
 326 #ifdef OPENSSL_SYS_VMS
 327             c = ent->dir[strlen(ent->dir) - 1];
 328             if (c != ':' && c != '>' && c != ']') {
 329                 /*
 330                  * If no separator is present, we assume the directory
 331                  * specifier is a logical name, and add a colon.  We really
 332                  * should use better VMS routines for merging things like
 333                  * this, but this will do for now... -- Richard Levitte
 334                  */
 335                 c = ':';
 336             } else {
 337                 c = '\0';
 338             }
 339 #endif
 340             if (c == '\0') {
 341                 /*
 342                  * This is special.  When c == '\0', no directory separator
 343                  * should be added.
 344                  */
 345                 BIO_snprintf(b->data, b->max,
 346                              "%s%08lx.%s%d", ent->dir, h, postfix, k);
 347             } else {
 348                 BIO_snprintf(b->data, b->max,
 349                              "%s%c%08lx.%s%d", ent->dir, c, h, postfix, k);
 350             }
 351 #ifndef OPENSSL_NO_POSIX_IO
 352 # ifdef _WIN32
 353 #  define stat _stat
 354 # endif
 355             {
 356                 struct stat st;
 357                 if (stat(b->data, &st) < 0)
 358                     break;
 359             }
 360 #endif
 361             /* found one. */
 362             if (type == X509_LU_X509) {
 363                 if ((X509_load_cert_file(xl, b->data, ent->dir_type)) == 0)
 364                     break;
 365             } else if (type == X509_LU_CRL) {
 366                 if ((X509_load_crl_file(xl, b->data, ent->dir_type)) == 0)
 367                     break;
 368             }
 369             /* else case will caught higher up */
 370             k++;
 371         }
 372
 373         /*
 374          * we have added it to the cache so now pull it out again
 375          */
 376         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 377         j = sk_X509_OBJECT_find(xl->store_ctx->objs, &stmp);
 378         if (j != -1)
 379             tmp = sk_X509_OBJECT_value(xl->store_ctx->objs, j);
 380         else
 381             tmp = NULL;
 382         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 383
 384         /* If a CRL, update the last file suffix added for this */
 385
 386         if (type == X509_LU_CRL) {
 387             CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 388             /*
 389              * Look for entry again in case another thread added an entry
 390              * first.
 391              */
 392             if (!hent) {
 393                 htmp.hash = h;
 394                 idx = sk_BY_DIR_HASH_find(ent->hashes, &htmp);
 395                 if (idx >= 0)
 396                     hent = sk_BY_DIR_HASH_value(ent->hashes, idx);
 397             }
 398             if (!hent) {
 399                 hent = OPENSSL_malloc(sizeof(BY_DIR_HASH));
 400                 if (hent == NULL) {
 401                     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 402                     X509err(X509_F_GET_CERT_BY_SUBJECT, ERR_R_MALLOC_FAILURE);
 403                     ok = 0;
 404                     goto finish;
 405                 }
 406                 hent->hash = h;
 407                 hent->suffix = k;
 408                 if (!sk_BY_DIR_HASH_push(ent->hashes, hent)) {
 409                     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 410                     OPENSSL_free(hent);
 411                     ok = 0;
 412                     goto finish;
 413                 }
 414             } else if (hent->suffix < k)
 415                 hent->suffix = k;
 416
 417             CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 418
 419         }
 420
 421         if (tmp != NULL) {
 422             ok = 1;
 423             ret->type = tmp->type;
 424             memcpy(&ret->data, &tmp->data, sizeof(ret->data));
 425             /*
 426              * If we were going to up the reference count, we would need to
 427              * do it on a perl 'type' basis
 428              */
 429         /*- CRYPTO_add(&tmp->data.x509->references,1,
 430                     CRYPTO_LOCK_X509);*/
 431             goto finish;
 432         }
 433     }
 434  finish:
 435     BUF_MEM_free(b);
 436     return (ok);
 437 }