apps/rehash.c

   1 /*
   2  * C implementation based on the original Perl and shell versions
   3  *
   4  * Copyright (c) 2013-2014 Timo Teräs <timo.teras@iki.fi>
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2015 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include "apps.h"
  61
  62 #if defined(unix) || defined(__APPLE__)
  63 # include <unistd.h>
  64 # include <stdio.h>
  65 # include <limits.h>
  66 # include <errno.h>
  67 # include <string.h>
  68 # include <ctype.h>
  69 # include <sys/stat.h>
  70
  71 # include "internal/o_dir.h"
  72 # include <openssl/evp.h>
  73 # include <openssl/pem.h>
  74 # include <openssl/x509.h>
  75
  76
  77 # define MAX_COLLISIONS  256
  78
  79 typedef struct hentry_st {
  80     struct hentry_st *next;
  81     char *filename;
  82     unsigned short old_id;
  83     unsigned char need_symlink;
  84     unsigned char digest[EVP_MAX_MD_SIZE];
  85 } HENTRY;
  86
  87 typedef struct bucket_st {
  88     struct bucket_st *next;
  89     HENTRY *first_entry, *last_entry;
  90     unsigned int hash;
  91     unsigned short type;
  92     unsigned short num_needed;
  93 } BUCKET;
  94
  95 enum Type {
  96     /* Keep in sync with |suffixes|, below. */
  97     TYPE_CERT=0, TYPE_CRL=1
  98 };
  99
 100 enum Hash {
 101     HASH_OLD, HASH_NEW, HASH_BOTH
 102 };
 103
 104
 105 static int evpmdsize;
 106 static const EVP_MD *evpmd;
 107 static int remove_links = 1;
 108 static int verbose = 0;
 109 static BUCKET *hash_table[257];
 110
 111 static const char *suffixes[] = { "", "r" };
 112 static const char *extensions[] = { "pem", "crt", "cer", "crl" };
 113
 114
 115 static void bit_set(unsigned char *set, unsigned int bit)
 116 {
 117     set[bit >> 3] |= 1 << (bit & 0x7);
 118 }
 119
 120 static int bit_isset(unsigned char *set, unsigned int bit)
 121 {
 122     return set[bit >> 3] & (1 << (bit & 0x7));
 123 }
 124
 125
 126 /*
 127  * Process an entry; return number of errors.
 128  */
 129 static int add_entry(enum Type type, unsigned int hash, const char *filename,
 130                       const unsigned char *digest, int need_symlink,
 131                       unsigned short old_id)
 132 {
 133     static BUCKET nilbucket;
 134     static HENTRY nilhentry;
 135     BUCKET *bp;
 136     HENTRY *ep, *found = NULL;
 137     unsigned int ndx = (type + hash) % OSSL_NELEM(hash_table);
 138
 139     for (bp = hash_table[ndx]; bp; bp = bp->next)
 140         if (bp->type == type && bp->hash == hash)
 141             break;
 142     if (bp == NULL) {
 143         bp = app_malloc(sizeof(*bp), "hash bucket");
 144         *bp = nilbucket;
 145         bp->next = hash_table[ndx];
 146         bp->type = type;
 147         bp->hash = hash;
 148         hash_table[ndx] = bp;
 149     }
 150
 151     for (ep = bp->first_entry; ep; ep = ep->next) {
 152         if (digest && memcmp(digest, ep->digest, evpmdsize) == 0) {
 153             BIO_printf(bio_err,
 154                        "%s: skipping duplicate certificate in %s\n",
 155                        opt_getprog(), filename);
 156             return 1;
 157         }
 158         if (strcmp(filename, ep->filename) == 0) {
 159             found = ep;
 160             if (digest == NULL)
 161                 break;
 162         }
 163     }
 164     ep = found;
 165     if (ep == NULL) {
 166         if (bp->num_needed >= MAX_COLLISIONS) {
 167             BIO_printf(bio_err,
 168                        "%s: hash table overflow for %s\n",
 169                        opt_getprog(), filename);
 170             return 1;
 171         }
 172         ep = app_malloc(sizeof(*ep), "collision bucket");
 173         *ep = nilhentry;
 174         ep->old_id = ~0;
 175         ep->filename = BUF_strdup(filename);
 176         if (bp->last_entry)
 177             bp->last_entry->next = ep;
 178         if (bp->first_entry == NULL)
 179             bp->first_entry = ep;
 180         bp->last_entry = ep;
 181     }
 182
 183     if (old_id < ep->old_id)
 184         ep->old_id = old_id;
 185     if (need_symlink && !ep->need_symlink) {
 186         ep->need_symlink = 1;
 187         bp->num_needed++;
 188         memcpy(ep->digest, digest, evpmdsize);
 189     }
 190     return 0;
 191 }
 192
 193 /*
 194  * Check if a symlink goes to the right spot; return 0 if okay.
 195  * This can be -1 if bad filename, or an error count.
 196  */
 197 static int handle_symlink(const char *filename, const char *fullpath)
 198 {
 199     unsigned int hash = 0;
 200     int i, type, id;
 201     unsigned char ch;
 202     char linktarget[NAME_MAX], *endptr;
 203     ssize_t n;
 204
 205     for (i = 0; i < 8; i++) {
 206         ch = filename[i];
 207         if (!isxdigit(ch))
 208             return -1;
 209         hash <<= 4;
 210         hash += app_hex(ch);
 211     }
 212     if (filename[i++] != '.')
 213         return -1;
 214     for (type = OSSL_NELEM(suffixes) - 1; type > 0; type--)
 215         if (strcasecmp(suffixes[type], &filename[i]) == 0)
 216             break;
 217     i += strlen(suffixes[type]);
 218
 219     id = strtoul(&filename[i], &endptr, 10);
 220     if (*endptr != '\0')
 221         return -1;
 222
 223     n = readlink(fullpath, linktarget, sizeof(linktarget));
 224     if (n < 0 || n >= (int)sizeof(linktarget))
 225         return -1;
 226     linktarget[n] = 0;
 227
 228     return add_entry(type, hash, linktarget, NULL, 0, id);
 229 }
 230
 231 /*
 232  * process a file, return number of errors.
 233  */
 234 static int do_file(const char *filename, const char *fullpath, enum Hash h)
 235 {
 236     STACK_OF (X509_INFO) *inf = NULL;
 237     X509_INFO *x;
 238     X509_NAME *name = NULL;
 239     BIO *b;
 240     const char *ext;
 241     unsigned char digest[EVP_MAX_MD_SIZE];
 242     int type, errs = 0;
 243     size_t i;
 244
 245     /* Does it end with a recognized extension? */
 246     if ((ext = strrchr(filename, '.')) == NULL)
 247         goto end;
 248     for (i = 0; i < OSSL_NELEM(extensions); i++) {
 249         if (strcasecmp(extensions[i], ext + 1) == 0)
 250             break;
 251     }
 252     if (i >= OSSL_NELEM(extensions))
 253         goto end;
 254
 255     /* Does it have X.509 data in it? */
 256     if ((b = BIO_new_file(fullpath, "r")) == NULL) {
 257         BIO_printf(bio_err, "%s: skipping %s, cannot open file\n",
 258                    opt_getprog(), filename);
 259         errs++;
 260         goto end;
 261     }
 262     inf = PEM_X509_INFO_read_bio(b, NULL, NULL, NULL);
 263     BIO_free(b);
 264     if (inf == NULL)
 265         goto end;
 266
 267     if (sk_X509_INFO_num(inf) != 1) {
 268         BIO_printf(bio_err,
 269                    "%s: skipping %s,"
 270                    "it does not contain exactly one certificate or CRL\n",
 271                    opt_getprog(), filename);
 272         /* This is not an error. */
 273         goto end;
 274     }
 275     x = sk_X509_INFO_value(inf, 0);
 276     if (x->x509) {
 277         type = TYPE_CERT;
 278         name = X509_get_subject_name(x->x509);
 279         X509_digest(x->x509, evpmd, digest, NULL);
 280     } else if (x->crl) {
 281         type = TYPE_CRL;
 282         name = X509_CRL_get_issuer(x->crl);
 283         X509_CRL_digest(x->crl, evpmd, digest, NULL);
 284     } else {
 285         ++errs;
 286         goto end;
 287     }
 288     if (name) {
 289         if ((h == HASH_NEW) || (h == HASH_BOTH))
 290             errs += add_entry(type, X509_NAME_hash(name), filename, digest, 1, ~0);
 291         if ((h == HASH_OLD) || (h == HASH_BOTH))
 292             errs += add_entry(type, X509_NAME_hash_old(name), filename, digest, 1, ~0);
 293     }
 294
 295 end:
 296     sk_X509_INFO_pop_free(inf, X509_INFO_free);
 297     return errs;
 298 }
 299
 300 /*
 301  * Process a directory; return number of errors found.
 302  */
 303 static int do_dir(const char *dirname, enum Hash h)
 304 {
 305     BUCKET *bp, *nextbp;
 306     HENTRY *ep, *nextep;
 307     OPENSSL_DIR_CTX *d = NULL;
 308     struct stat st;
 309     unsigned char idmask[MAX_COLLISIONS / 8];
 310     int n, nextid, buflen, errs = 0;
 311     size_t i;
 312     const char *pathsep;
 313     const char *filename;
 314     char *buf;
 315
 316     if (app_access(dirname, W_OK) < 0) {
 317         BIO_printf(bio_err, "Skipping %s, can't write\n", dirname);
 318         return 0;
 319     }
 320     buflen = strlen(dirname);
 321     pathsep = (buflen && dirname[buflen - 1] == '/') ? "" : "/";
 322     buflen += NAME_MAX + 2;
 323     buf = app_malloc(buflen, "filename buffer");
 324
 325     if (verbose)
 326         BIO_printf(bio_out, "Doing %s\n", dirname);
 327
 328     while ((filename = OPENSSL_DIR_read(&d, dirname)) != NULL) {
 329         if (snprintf(buf, buflen, "%s%s%s",
 330                     dirname, pathsep, filename) >= buflen)
 331             continue;
 332         if (lstat(buf, &st) < 0)
 333             continue;
 334         if (S_ISLNK(st.st_mode) && handle_symlink(filename, buf) == 0)
 335             continue;
 336         errs += do_file(filename, buf, h);
 337     }
 338     OPENSSL_DIR_end(&d);
 339
 340     for (i = 0; i < OSSL_NELEM(hash_table); i++) {
 341         for (bp = hash_table[i]; bp; bp = nextbp) {
 342             nextbp = bp->next;
 343             nextid = 0;
 344             memset(idmask, 0, (bp->num_needed + 7) / 8);
 345             for (ep = bp->first_entry; ep; ep = ep->next)
 346                 if (ep->old_id < bp->num_needed)
 347                     bit_set(idmask, ep->old_id);
 348
 349             for (ep = bp->first_entry; ep; ep = nextep) {
 350                 nextep = ep->next;
 351                 if (ep->old_id < bp->num_needed) {
 352                     /* Link exists, and is used as-is */
 353                     snprintf(buf, buflen, "%08x.%s%d", bp->hash,
 354                              suffixes[bp->type], ep->old_id);
 355                     if (verbose)
 356                         BIO_printf(bio_out, "link %s -> %s\n",
 357                                    ep->filename, buf);
 358                 } else if (ep->need_symlink) {
 359                     /* New link needed (it may replace something) */
 360                     while (bit_isset(idmask, nextid))
 361                         nextid++;
 362
 363                     snprintf(buf, buflen, "%s%s%n%08x.%s%d",
 364                              dirname, pathsep, &n, bp->hash,
 365                              suffixes[bp->type], nextid);
 366                     if (verbose)
 367                         BIO_printf(bio_out, "link %s -> %s\n",
 368                                    ep->filename, &buf[n]);
 369                     if (unlink(buf) < 0 && errno != ENOENT) {
 370                         BIO_printf(bio_err,
 371                                    "%s: Can't unlink %s, %s\n",
 372                                    opt_getprog(), buf, strerror(errno));
 373                         errs++;
 374                     }
 375                     if (symlink(ep->filename, buf) < 0) {
 376                         BIO_printf(bio_err,
 377                                    "%s: Can't symlink %s, %s\n",
 378                                    opt_getprog(), ep->filename,
 379                                    strerror(errno));
 380                         errs++;
 381                     }
 382                 } else if (remove_links) {
 383                     /* Link to be deleted */
 384                     snprintf(buf, buflen, "%s%s%n%08x.%s%d",
 385                              dirname, pathsep, &n, bp->hash,
 386                              suffixes[bp->type], ep->old_id);
 387                     if (verbose)
 388                         BIO_printf(bio_out, "unlink %s\n",
 389                                    &buf[n]);
 390                     if (unlink(buf) < 0 && errno != ENOENT) {
 391                         BIO_printf(bio_err,
 392                                    "%s: Can't unlink %s, %s\n",
 393                                    opt_getprog(), buf, strerror(errno));
 394                         errs++;
 395                     }
 396                 }
 397                 OPENSSL_free(ep->filename);
 398                 OPENSSL_free(ep);
 399             }
 400             OPENSSL_free(bp);
 401         }
 402         hash_table[i] = NULL;
 403     }
 404
 405     OPENSSL_free(buf);
 406     return errs;
 407 }
 408
 409 typedef enum OPTION_choice {
 410     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
 411     OPT_COMPAT, OPT_OLD, OPT_N, OPT_VERBOSE
 412 } OPTION_CHOICE;
 413
 414 OPTIONS rehash_options[] = {
 415     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [cert-directory...]\n"},
 416     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
 417     {"help", OPT_HELP, '-', "Display this summary"},
 418     {"compat", OPT_COMPAT, '-', "Create both new- and old-style hash links"},
 419     {"old", OPT_OLD, '-', "Use old-style hash to generate links"},
 420     {"n", OPT_N, '-', "Do not remove existing links"},
 421     {"v", OPT_VERBOSE, '-', "Verbose output"},
 422     {NULL}
 423 };
 424
 425
 426 int rehash_main(int argc, char **argv)
 427 {
 428     const char *env, *prog;
 429     char *e, *m;
 430     int errs = 0;
 431     OPTION_CHOICE o;
 432     enum Hash h = HASH_NEW;
 433
 434     prog = opt_init(argc, argv, rehash_options);
 435     while ((o = opt_next()) != OPT_EOF) {
 436         switch (o) {
 437         case OPT_EOF:
 438         case OPT_ERR:
 439             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 440             goto end;
 441         case OPT_HELP:
 442             opt_help(rehash_options);
 443             goto end;
 444         case OPT_COMPAT:
 445             h = HASH_BOTH;
 446             break;
 447         case OPT_OLD:
 448             h = HASH_OLD;
 449             break;
 450         case OPT_N:
 451             remove_links = 0;
 452             break;
 453         case OPT_VERBOSE:
 454             verbose = 1;
 455             break;
 456         }
 457     }
 458     argc = opt_num_rest();
 459     argv = opt_rest();
 460
 461     evpmd = EVP_sha1();
 462     evpmdsize = EVP_MD_size(evpmd);
 463
 464     if (*argv) {
 465         while (*argv)
 466             errs += do_dir(*argv++, h);
 467     } else if ((env = getenv("SSL_CERT_DIR")) != NULL) {
 468         m = BUF_strdup(env);
 469         for (e = strtok(m, ":"); e != NULL; e = strtok(NULL, ":"))
 470             errs += do_dir(e, h);
 471         OPENSSL_free(m);
 472     } else {
 473         errs += do_dir("/etc/ssl/certs", h);
 474     }
 475
 476  end:
 477     return errs;
 478 }
 479
 480 #else
 481 OPTIONS rehash_options[] = {
 482     {NULL}
 483 };
 484
 485 int rehash_main(int argc, char **argv)
 486 {
 487     BIO_printf(bio_err, "Not available; use c_rehash script\n");
 488     return (1);
 489 }
 490
 491 #endif /* defined(unix) || defined(__APPLE__) */