apps/rehash.c

   1 /*
   2  * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2013-2014 Timo Teräs <timo.teras@gmail.com>
   4  *
   5  * Licensed under the Apache License 2.0 (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #include "apps.h"
  12 #include "progs.h"
  13
  14 #if defined(OPENSSL_SYS_UNIX) || defined(__APPLE__) || \
  15     (defined(__VMS) && defined(__DECC) && __CRTL_VER >= 80300000)
  16 # include <unistd.h>
  17 # include <stdio.h>
  18 # include <limits.h>
  19 # include <errno.h>
  20 # include <string.h>
  21 # include <ctype.h>
  22 # include <sys/stat.h>
  23
  24 /*
  25  * Make sure that the processing of symbol names is treated the same as when
  26  * libcrypto is built.  This is done automatically for public headers (see
  27  * include/openssl/__DECC_INCLUDE_PROLOGUE.H and __DECC_INCLUDE_EPILOGUE.H),
  28  * but not for internal headers.
  29  */
  30 # ifdef __VMS
  31 #  pragma names save
  32 #  pragma names as_is,shortened
  33 # endif
  34
  35 # include "internal/o_dir.h"
  36
  37 # ifdef __VMS
  38 #  pragma names restore
  39 # endif
  40
  41 # include <openssl/evp.h>
  42 # include <openssl/pem.h>
  43 # include <openssl/x509.h>
  44
  45 # ifndef PATH_MAX
  46 #  define PATH_MAX 4096
  47 # endif
  48 # ifndef NAME_MAX
  49 #  define NAME_MAX 255
  50 # endif
  51 # define MAX_COLLISIONS  256
  52
  53 # if defined(OPENSSL_SYS_VXWORKS)
  54 /*
  55  * VxWorks has no symbolic links
  56  */
  57
  58 #  define lstat(path, buf) stat(path, buf)
  59
  60 int symlink(const char *target, const char *linkpath)
  61 {
  62     errno = ENOSYS;
  63     return -1;
  64 }
  65
  66 ssize_t readlink(const char *pathname, char *buf, size_t bufsiz)
  67 {
  68     errno = ENOSYS;
  69     return -1;
  70 }
  71 # endif
  72
  73 typedef struct hentry_st {
  74     struct hentry_st *next;
  75     char *filename;
  76     unsigned short old_id;
  77     unsigned char need_symlink;
  78     unsigned char digest[EVP_MAX_MD_SIZE];
  79 } HENTRY;
  80
  81 typedef struct bucket_st {
  82     struct bucket_st *next;
  83     HENTRY *first_entry, *last_entry;
  84     unsigned int hash;
  85     unsigned short type;
  86     unsigned short num_needed;
  87 } BUCKET;
  88
  89 enum Type {
  90     /* Keep in sync with |suffixes|, below. */
  91     TYPE_CERT=0, TYPE_CRL=1
  92 };
  93
  94 enum Hash {
  95     HASH_OLD, HASH_NEW, HASH_BOTH
  96 };
  97
  98
  99 static int evpmdsize;
 100 static const EVP_MD *evpmd;
 101 static int remove_links = 1;
 102 static int verbose = 0;
 103 static BUCKET *hash_table[257];
 104
 105 static const char *suffixes[] = { "", "r" };
 106 static const char *extensions[] = { "pem", "crt", "cer", "crl" };
 107
 108
 109 static void bit_set(unsigned char *set, unsigned int bit)
 110 {
 111     set[bit >> 3] |= 1 << (bit & 0x7);
 112 }
 113
 114 static int bit_isset(unsigned char *set, unsigned int bit)
 115 {
 116     return set[bit >> 3] & (1 << (bit & 0x7));
 117 }
 118
 119
 120 /*
 121  * Process an entry; return number of errors.
 122  */
 123 static int add_entry(enum Type type, unsigned int hash, const char *filename,
 124                       const unsigned char *digest, int need_symlink,
 125                       unsigned short old_id)
 126 {
 127     static BUCKET nilbucket;
 128     static HENTRY nilhentry;
 129     BUCKET *bp;
 130     HENTRY *ep, *found = NULL;
 131     unsigned int ndx = (type + hash) % OSSL_NELEM(hash_table);
 132
 133     for (bp = hash_table[ndx]; bp; bp = bp->next)
 134         if (bp->type == type && bp->hash == hash)
 135             break;
 136     if (bp == NULL) {
 137         bp = app_malloc(sizeof(*bp), "hash bucket");
 138         *bp = nilbucket;
 139         bp->next = hash_table[ndx];
 140         bp->type = type;
 141         bp->hash = hash;
 142         hash_table[ndx] = bp;
 143     }
 144
 145     for (ep = bp->first_entry; ep; ep = ep->next) {
 146         if (digest && memcmp(digest, ep->digest, evpmdsize) == 0) {
 147             BIO_printf(bio_err,
 148                        "%s: warning: skipping duplicate %s in %s\n",
 149                        opt_getprog(),
 150                        type == TYPE_CERT ? "certificate" : "CRL", filename);
 151             return 0;
 152         }
 153         if (strcmp(filename, ep->filename) == 0) {
 154             found = ep;
 155             if (digest == NULL)
 156                 break;
 157         }
 158     }
 159     ep = found;
 160     if (ep == NULL) {
 161         if (bp->num_needed >= MAX_COLLISIONS) {
 162             BIO_printf(bio_err,
 163                        "%s: error: hash table overflow for %s\n",
 164                        opt_getprog(), filename);
 165             return 1;
 166         }
 167         ep = app_malloc(sizeof(*ep), "collision bucket");
 168         *ep = nilhentry;
 169         ep->old_id = ~0;
 170         ep->filename = OPENSSL_strdup(filename);
 171         if (bp->last_entry)
 172             bp->last_entry->next = ep;
 173         if (bp->first_entry == NULL)
 174             bp->first_entry = ep;
 175         bp->last_entry = ep;
 176     }
 177
 178     if (old_id < ep->old_id)
 179         ep->old_id = old_id;
 180     if (need_symlink && !ep->need_symlink) {
 181         ep->need_symlink = 1;
 182         bp->num_needed++;
 183         memcpy(ep->digest, digest, evpmdsize);
 184     }
 185     return 0;
 186 }
 187
 188 /*
 189  * Check if a symlink goes to the right spot; return 0 if okay.
 190  * This can be -1 if bad filename, or an error count.
 191  */
 192 static int handle_symlink(const char *filename, const char *fullpath)
 193 {
 194     unsigned int hash = 0;
 195     int i, type, id;
 196     unsigned char ch;
 197     char linktarget[PATH_MAX], *endptr;
 198     ossl_ssize_t n;
 199
 200     for (i = 0; i < 8; i++) {
 201         ch = filename[i];
 202         if (!isxdigit(ch))
 203             return -1;
 204         hash <<= 4;
 205         hash += OPENSSL_hexchar2int(ch);
 206     }
 207     if (filename[i++] != '.')
 208         return -1;
 209     for (type = OSSL_NELEM(suffixes) - 1; type > 0; type--) {
 210         const char *suffix = suffixes[type];
 211         if (strncasecmp(suffix, &filename[i], strlen(suffix)) == 0)
 212             break;
 213     }
 214     i += strlen(suffixes[type]);
 215
 216     id = strtoul(&filename[i], &endptr, 10);
 217     if (*endptr != '\0')
 218         return -1;
 219
 220     n = readlink(fullpath, linktarget, sizeof(linktarget));
 221     if (n < 0 || n >= (int)sizeof(linktarget))
 222         return -1;
 223     linktarget[n] = 0;
 224
 225     return add_entry(type, hash, linktarget, NULL, 0, id);
 226 }
 227
 228 /*
 229  * process a file, return number of errors.
 230  */
 231 static int do_file(const char *filename, const char *fullpath, enum Hash h)
 232 {
 233     STACK_OF (X509_INFO) *inf = NULL;
 234     X509_INFO *x;
 235     const X509_NAME *name = NULL;
 236     BIO *b;
 237     const char *ext;
 238     unsigned char digest[EVP_MAX_MD_SIZE];
 239     int type, errs = 0;
 240     size_t i;
 241
 242     /* Does it end with a recognized extension? */
 243     if ((ext = strrchr(filename, '.')) == NULL)
 244         goto end;
 245     for (i = 0; i < OSSL_NELEM(extensions); i++) {
 246         if (strcasecmp(extensions[i], ext + 1) == 0)
 247             break;
 248     }
 249     if (i >= OSSL_NELEM(extensions))
 250         goto end;
 251
 252     /* Does it have X.509 data in it? */
 253     if ((b = BIO_new_file(fullpath, "r")) == NULL) {
 254         BIO_printf(bio_err, "%s: error: skipping %s, cannot open file\n",
 255                    opt_getprog(), filename);
 256         errs++;
 257         goto end;
 258     }
 259     inf = PEM_X509_INFO_read_bio(b, NULL, NULL, NULL);
 260     BIO_free(b);
 261     if (inf == NULL)
 262         goto end;
 263
 264     if (sk_X509_INFO_num(inf) != 1) {
 265         BIO_printf(bio_err,
 266                    "%s: warning: skipping %s,"
 267                    "it does not contain exactly one certificate or CRL\n",
 268                    opt_getprog(), filename);
 269         /* This is not an error. */
 270         goto end;
 271     }
 272     x = sk_X509_INFO_value(inf, 0);
 273     if (x->x509 != NULL) {
 274         type = TYPE_CERT;
 275         name = X509_get_subject_name(x->x509);
 276         if (!X509_digest(x->x509, evpmd, digest, NULL)) {
 277             BIO_printf(bio_err, "out of memory\n");
 278             ++errs;
 279             goto end;
 280         }
 281     } else if (x->crl != NULL) {
 282         type = TYPE_CRL;
 283         name = X509_CRL_get_issuer(x->crl);
 284         if (!X509_CRL_digest(x->crl, evpmd, digest, NULL)) {
 285             BIO_printf(bio_err, "out of memory\n");
 286             ++errs;
 287             goto end;
 288         }
 289     } else {
 290         ++errs;
 291         goto end;
 292     }
 293     if (name != NULL) {
 294         if (h == HASH_NEW || h == HASH_BOTH) {
 295             int ok;
 296             unsigned long hash_value =
 297                 X509_NAME_hash_ex(name,
 298                                   app_get0_libctx(), app_get0_propq(), &ok);
 299
 300             if (ok) {
 301                 errs += add_entry(type, hash_value, filename, digest, 1, ~0);
 302             } else {
 303                 BIO_printf(bio_err, "%s: error calculating SHA1 hash value\n",
 304                            opt_getprog());
 305                 errs++;
 306             }
 307         }
 308         if ((h == HASH_OLD) || (h == HASH_BOTH))
 309             errs += add_entry(type, X509_NAME_hash_old(name),
 310                               filename, digest, 1, ~0);
 311     }
 312
 313 end:
 314     sk_X509_INFO_pop_free(inf, X509_INFO_free);
 315     return errs;
 316 }
 317
 318 static void str_free(char *s)
 319 {
 320     OPENSSL_free(s);
 321 }
 322
 323 static int ends_with_dirsep(const char *path)
 324 {
 325     if (*path != '\0')
 326         path += strlen(path) - 1;
 327 # if defined __VMS
 328     if (*path == ']' || *path == '>' || *path == ':')
 329         return 1;
 330 # elif defined _WIN32
 331     if (*path == '\\')
 332         return 1;
 333 # endif
 334     return *path == '/';
 335 }
 336
 337 /*
 338  * Process a directory; return number of errors found.
 339  */
 340 static int do_dir(const char *dirname, enum Hash h)
 341 {
 342     BUCKET *bp, *nextbp;
 343     HENTRY *ep, *nextep;
 344     OPENSSL_DIR_CTX *d = NULL;
 345     struct stat st;
 346     unsigned char idmask[MAX_COLLISIONS / 8];
 347     int n, numfiles, nextid, buflen, errs = 0;
 348     size_t i;
 349     const char *pathsep;
 350     const char *filename;
 351     char *buf, *copy = NULL;
 352     STACK_OF(OPENSSL_STRING) *files = NULL;
 353
 354     if (app_access(dirname, W_OK) < 0) {
 355         BIO_printf(bio_err, "Skipping %s, can't write\n", dirname);
 356         return 1;
 357     }
 358     buflen = strlen(dirname);
 359     pathsep = (buflen && !ends_with_dirsep(dirname)) ? "/": "";
 360     buflen += NAME_MAX + 1 + 1;
 361     buf = app_malloc(buflen, "filename buffer");
 362
 363     if (verbose)
 364         BIO_printf(bio_out, "Doing %s\n", dirname);
 365
 366     if ((files = sk_OPENSSL_STRING_new_null()) == NULL) {
 367         BIO_printf(bio_err, "Skipping %s, out of memory\n", dirname);
 368         errs = 1;
 369         goto err;
 370     }
 371     while ((filename = OPENSSL_DIR_read(&d, dirname)) != NULL) {
 372         if ((copy = OPENSSL_strdup(filename)) == NULL
 373                 || sk_OPENSSL_STRING_push(files, copy) == 0) {
 374             OPENSSL_free(copy);
 375             BIO_puts(bio_err, "out of memory\n");
 376             errs = 1;
 377             goto err;
 378         }
 379     }
 380     OPENSSL_DIR_end(&d);
 381     sk_OPENSSL_STRING_sort(files);
 382
 383     numfiles = sk_OPENSSL_STRING_num(files);
 384     for (n = 0; n < numfiles; ++n) {
 385         filename = sk_OPENSSL_STRING_value(files, n);
 386         if (BIO_snprintf(buf, buflen, "%s%s%s",
 387                          dirname, pathsep, filename) >= buflen)
 388             continue;
 389         if (lstat(buf, &st) < 0)
 390             continue;
 391         if (S_ISLNK(st.st_mode) && handle_symlink(filename, buf) == 0)
 392             continue;
 393         errs += do_file(filename, buf, h);
 394     }
 395
 396     for (i = 0; i < OSSL_NELEM(hash_table); i++) {
 397         for (bp = hash_table[i]; bp; bp = nextbp) {
 398             nextbp = bp->next;
 399             nextid = 0;
 400             memset(idmask, 0, (bp->num_needed + 7) / 8);
 401             for (ep = bp->first_entry; ep; ep = ep->next)
 402                 if (ep->old_id < bp->num_needed)
 403                     bit_set(idmask, ep->old_id);
 404
 405             for (ep = bp->first_entry; ep; ep = nextep) {
 406                 nextep = ep->next;
 407                 if (ep->old_id < bp->num_needed) {
 408                     /* Link exists, and is used as-is */
 409                     BIO_snprintf(buf, buflen, "%08x.%s%d", bp->hash,
 410                                  suffixes[bp->type], ep->old_id);
 411                     if (verbose)
 412                         BIO_printf(bio_out, "link %s -> %s\n",
 413                                    ep->filename, buf);
 414                 } else if (ep->need_symlink) {
 415                     /* New link needed (it may replace something) */
 416                     while (bit_isset(idmask, nextid))
 417                         nextid++;
 418
 419                     BIO_snprintf(buf, buflen, "%s%s%n%08x.%s%d",
 420                                  dirname, pathsep, &n, bp->hash,
 421                                  suffixes[bp->type], nextid);
 422                     if (verbose)
 423                         BIO_printf(bio_out, "link %s -> %s\n",
 424                                    ep->filename, &buf[n]);
 425                     if (unlink(buf) < 0 && errno != ENOENT) {
 426                         BIO_printf(bio_err,
 427                                    "%s: Can't unlink %s, %s\n",
 428                                    opt_getprog(), buf, strerror(errno));
 429                         errs++;
 430                     }
 431                     if (symlink(ep->filename, buf) < 0) {
 432                         BIO_printf(bio_err,
 433                                    "%s: Can't symlink %s, %s\n",
 434                                    opt_getprog(), ep->filename,
 435                                    strerror(errno));
 436                         errs++;
 437                     }
 438                     bit_set(idmask, nextid);
 439                 } else if (remove_links) {
 440                     /* Link to be deleted */
 441                     BIO_snprintf(buf, buflen, "%s%s%n%08x.%s%d",
 442                                  dirname, pathsep, &n, bp->hash,
 443                                  suffixes[bp->type], ep->old_id);
 444                     if (verbose)
 445                         BIO_printf(bio_out, "unlink %s\n",
 446                                    &buf[n]);
 447                     if (unlink(buf) < 0 && errno != ENOENT) {
 448                         BIO_printf(bio_err,
 449                                    "%s: Can't unlink %s, %s\n",
 450                                    opt_getprog(), buf, strerror(errno));
 451                         errs++;
 452                     }
 453                 }
 454                 OPENSSL_free(ep->filename);
 455                 OPENSSL_free(ep);
 456             }
 457             OPENSSL_free(bp);
 458         }
 459         hash_table[i] = NULL;
 460     }
 461
 462  err:
 463     sk_OPENSSL_STRING_pop_free(files, str_free);
 464     OPENSSL_free(buf);
 465     return errs;
 466 }
 467
 468 typedef enum OPTION_choice {
 469     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
 470     OPT_COMPAT, OPT_OLD, OPT_N, OPT_VERBOSE,
 471     OPT_PROV_ENUM
 472 } OPTION_CHOICE;
 473
 474 const OPTIONS rehash_options[] = {
 475     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [directory...]\n"},
 476
 477     OPT_SECTION("General"),
 478     {"help", OPT_HELP, '-', "Display this summary"},
 479     {"h", OPT_HELP, '-', "Display this summary"},
 480     {"compat", OPT_COMPAT, '-', "Create both new- and old-style hash links"},
 481     {"old", OPT_OLD, '-', "Use old-style hash to generate links"},
 482     {"n", OPT_N, '-', "Do not remove existing links"},
 483
 484     OPT_SECTION("Output"),
 485     {"v", OPT_VERBOSE, '-', "Verbose output"},
 486
 487     OPT_PROV_OPTIONS,
 488
 489     OPT_PARAMETERS(),
 490     {"directory", 0, 0, "One or more directories to process (optional)"},
 491     {NULL}
 492 };
 493
 494
 495 int rehash_main(int argc, char **argv)
 496 {
 497     const char *env, *prog;
 498     char *e, *m;
 499     int errs = 0;
 500     OPTION_CHOICE o;
 501     enum Hash h = HASH_NEW;
 502
 503     prog = opt_init(argc, argv, rehash_options);
 504     while ((o = opt_next()) != OPT_EOF) {
 505         switch (o) {
 506         case OPT_EOF:
 507         case OPT_ERR:
 508             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 509             goto end;
 510         case OPT_HELP:
 511             opt_help(rehash_options);
 512             goto end;
 513         case OPT_COMPAT:
 514             h = HASH_BOTH;
 515             break;
 516         case OPT_OLD:
 517             h = HASH_OLD;
 518             break;
 519         case OPT_N:
 520             remove_links = 0;
 521             break;
 522         case OPT_VERBOSE:
 523             verbose = 1;
 524             break;
 525         case OPT_PROV_CASES:
 526             if (!opt_provider(o))
 527                 goto end;
 528             break;
 529         }
 530     }
 531
 532     /* Optional arguments are directories to scan. */
 533     argc = opt_num_rest();
 534     argv = opt_rest();
 535
 536     evpmd = EVP_sha1();
 537     evpmdsize = EVP_MD_size(evpmd);
 538
 539     if (*argv != NULL) {
 540         while (*argv != NULL)
 541             errs += do_dir(*argv++, h);
 542     } else if ((env = getenv(X509_get_default_cert_dir_env())) != NULL) {
 543         char lsc[2] = { LIST_SEPARATOR_CHAR, '\0' };
 544         m = OPENSSL_strdup(env);
 545         for (e = strtok(m, lsc); e != NULL; e = strtok(NULL, lsc))
 546             errs += do_dir(e, h);
 547         OPENSSL_free(m);
 548     } else {
 549         errs += do_dir(X509_get_default_cert_dir(), h);
 550     }
 551
 552  end:
 553     return errs;
 554 }
 555
 556 #else
 557 const OPTIONS rehash_options[] = {
 558     {NULL}
 559 };
 560
 561 int rehash_main(int argc, char **argv)
 562 {
 563     BIO_printf(bio_err, "Not available; use c_rehash script\n");
 564     return 1;
 565 }
 566
 567 #endif /* defined(OPENSSL_SYS_UNIX) || defined(__APPLE__) */