apps/rehash.c

   1 /*
   2  * Copyright 2015-2018 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
  46 # ifndef PATH_MAX
  47 #  define PATH_MAX 4096
  48 # endif
  49 # ifndef NAME_MAX
  50 #  define NAME_MAX 255
  51 # endif
  52 # define MAX_COLLISIONS  256
  53
  54 # if defined(OPENSSL_SYS_VXWORKS)
  55 /*
  56  * VxWorks has no symbolic links
  57  */
  58
  59 #  define lstat(path, buf) stat(path, buf)
  60
  61 int symlink(const char *target, const char *linkpath)
  62 {
  63     errno = ENOSYS;
  64     return -1;
  65 }
  66
  67 ssize_t readlink(const char *pathname, char *buf, size_t bufsiz)
  68 {
  69     errno = ENOSYS;
  70     return -1;
  71 }
  72 # endif
  73
  74 typedef struct hentry_st {
  75     struct hentry_st *next;
  76     char *filename;
  77     unsigned short old_id;
  78     unsigned char need_symlink;
  79     unsigned char digest[EVP_MAX_MD_SIZE];
  80 } HENTRY;
  81
  82 typedef struct bucket_st {
  83     struct bucket_st *next;
  84     HENTRY *first_entry, *last_entry;
  85     unsigned int hash;
  86     unsigned short type;
  87     unsigned short num_needed;
  88 } BUCKET;
  89
  90 enum Type {
  91     /* Keep in sync with |suffixes|, below. */
  92     TYPE_CERT=0, TYPE_CRL=1
  93 };
  94
  95 enum Hash {
  96     HASH_OLD, HASH_NEW, HASH_BOTH
  97 };
  98
  99
 100 static int evpmdsize;
 101 static const EVP_MD *evpmd;
 102 static int remove_links = 1;
 103 static int verbose = 0;
 104 static BUCKET *hash_table[257];
 105
 106 static const char *suffixes[] = { "", "r" };
 107 static const char *extensions[] = { "pem", "crt", "cer", "crl" };
 108
 109
 110 static void bit_set(unsigned char *set, unsigned int bit)
 111 {
 112     set[bit >> 3] |= 1 << (bit & 0x7);
 113 }
 114
 115 static int bit_isset(unsigned char *set, unsigned int bit)
 116 {
 117     return set[bit >> 3] & (1 << (bit & 0x7));
 118 }
 119
 120
 121 /*
 122  * Process an entry; return number of errors.
 123  */
 124 static int add_entry(enum Type type, unsigned int hash, const char *filename,
 125                       const unsigned char *digest, int need_symlink,
 126                       unsigned short old_id)
 127 {
 128     static BUCKET nilbucket;
 129     static HENTRY nilhentry;
 130     BUCKET *bp;
 131     HENTRY *ep, *found = NULL;
 132     unsigned int ndx = (type + hash) % OSSL_NELEM(hash_table);
 133
 134     for (bp = hash_table[ndx]; bp; bp = bp->next)
 135         if (bp->type == type && bp->hash == hash)
 136             break;
 137     if (bp == NULL) {
 138         bp = app_malloc(sizeof(*bp), "hash bucket");
 139         *bp = nilbucket;
 140         bp->next = hash_table[ndx];
 141         bp->type = type;
 142         bp->hash = hash;
 143         hash_table[ndx] = bp;
 144     }
 145
 146     for (ep = bp->first_entry; ep; ep = ep->next) {
 147         if (digest && memcmp(digest, ep->digest, evpmdsize) == 0) {
 148             BIO_printf(bio_err,
 149                        "%s: warning: skipping duplicate %s in %s\n",
 150                        opt_getprog(),
 151                        type == TYPE_CERT ? "certificate" : "CRL", filename);
 152             return 0;
 153         }
 154         if (strcmp(filename, ep->filename) == 0) {
 155             found = ep;
 156             if (digest == NULL)
 157                 break;
 158         }
 159     }
 160     ep = found;
 161     if (ep == NULL) {
 162         if (bp->num_needed >= MAX_COLLISIONS) {
 163             BIO_printf(bio_err,
 164                        "%s: error: hash table overflow for %s\n",
 165                        opt_getprog(), filename);
 166             return 1;
 167         }
 168         ep = app_malloc(sizeof(*ep), "collision bucket");
 169         *ep = nilhentry;
 170         ep->old_id = ~0;
 171         ep->filename = OPENSSL_strdup(filename);
 172         if (bp->last_entry)
 173             bp->last_entry->next = ep;
 174         if (bp->first_entry == NULL)
 175             bp->first_entry = ep;
 176         bp->last_entry = ep;
 177     }
 178
 179     if (old_id < ep->old_id)
 180         ep->old_id = old_id;
 181     if (need_symlink && !ep->need_symlink) {
 182         ep->need_symlink = 1;
 183         bp->num_needed++;
 184         memcpy(ep->digest, digest, evpmdsize);
 185     }
 186     return 0;
 187 }
 188
 189 /*
 190  * Check if a symlink goes to the right spot; return 0 if okay.
 191  * This can be -1 if bad filename, or an error count.
 192  */
 193 static int handle_symlink(const char *filename, const char *fullpath)
 194 {
 195     unsigned int hash = 0;
 196     int i, type, id;
 197     unsigned char ch;
 198     char linktarget[PATH_MAX], *endptr;
 199     ossl_ssize_t n;
 200
 201     for (i = 0; i < 8; i++) {
 202         ch = filename[i];
 203         if (!isxdigit(ch))
 204             return -1;
 205         hash <<= 4;
 206         hash += OPENSSL_hexchar2int(ch);
 207     }
 208     if (filename[i++] != '.')
 209         return -1;
 210     for (type = OSSL_NELEM(suffixes) - 1; type > 0; type--) {
 211         const char *suffix = suffixes[type];
 212         if (strncasecmp(suffix, &filename[i], strlen(suffix)) == 0)
 213             break;
 214     }
 215     i += strlen(suffixes[type]);
 216
 217     id = strtoul(&filename[i], &endptr, 10);
 218     if (*endptr != '\0')
 219         return -1;
 220
 221     n = readlink(fullpath, linktarget, sizeof(linktarget));
 222     if (n < 0 || n >= (int)sizeof(linktarget))
 223         return -1;
 224     linktarget[n] = 0;
 225
 226     return add_entry(type, hash, linktarget, NULL, 0, id);
 227 }
 228
 229 /*
 230  * process a file, return number of errors.
 231  */
 232 static int do_file(const char *filename, const char *fullpath, enum Hash h)
 233 {
 234     STACK_OF (X509_INFO) *inf = NULL;
 235     X509_INFO *x;
 236     X509_NAME *name = NULL;
 237     BIO *b;
 238     const char *ext;
 239     unsigned char digest[EVP_MAX_MD_SIZE];
 240     int type, errs = 0;
 241     size_t i;
 242
 243     /* Does it end with a recognized extension? */
 244     if ((ext = strrchr(filename, '.')) == NULL)
 245         goto end;
 246     for (i = 0; i < OSSL_NELEM(extensions); i++) {
 247         if (strcasecmp(extensions[i], ext + 1) == 0)
 248             break;
 249     }
 250     if (i >= OSSL_NELEM(extensions))
 251         goto end;
 252
 253     /* Does it have X.509 data in it? */
 254     if ((b = BIO_new_file(fullpath, "r")) == NULL) {
 255         BIO_printf(bio_err, "%s: error: skipping %s, cannot open file\n",
 256                    opt_getprog(), filename);
 257         errs++;
 258         goto end;
 259     }
 260     inf = PEM_X509_INFO_read_bio(b, NULL, NULL, NULL);
 261     BIO_free(b);
 262     if (inf == NULL)
 263         goto end;
 264
 265     if (sk_X509_INFO_num(inf) != 1) {
 266         BIO_printf(bio_err,
 267                    "%s: warning: skipping %s,"
 268                    "it does not contain exactly one certificate or CRL\n",
 269                    opt_getprog(), filename);
 270         /* This is not an error. */
 271         goto end;
 272     }
 273     x = sk_X509_INFO_value(inf, 0);
 274     if (x->x509 != NULL) {
 275         type = TYPE_CERT;
 276         name = X509_get_subject_name(x->x509);
 277         X509_digest(x->x509, evpmd, digest, NULL);
 278     } else if (x->crl != NULL) {
 279         type = TYPE_CRL;
 280         name = X509_CRL_get_issuer(x->crl);
 281         X509_CRL_digest(x->crl, evpmd, digest, NULL);
 282     } else {
 283         ++errs;
 284         goto end;
 285     }
 286     if (name != NULL) {
 287         if ((h == HASH_NEW) || (h == HASH_BOTH))
 288             errs += add_entry(type, X509_NAME_hash(name), filename, digest, 1, ~0);
 289         if ((h == HASH_OLD) || (h == HASH_BOTH))
 290             errs += add_entry(type, X509_NAME_hash_old(name), filename, digest, 1, ~0);
 291     }
 292
 293 end:
 294     sk_X509_INFO_pop_free(inf, X509_INFO_free);
 295     return errs;
 296 }
 297
 298 static void str_free(char *s)
 299 {
 300     OPENSSL_free(s);
 301 }
 302
 303 static int ends_with_dirsep(const char *path)
 304 {
 305     if (*path != '\0')
 306         path += strlen(path) - 1;
 307 # if defined __VMS
 308     if (*path == ']' || *path == '>' || *path == ':')
 309         return 1;
 310 # elif defined _WIN32
 311     if (*path == '\\')
 312         return 1;
 313 # endif
 314     return *path == '/';
 315 }
 316
 317 /*
 318  * Process a directory; return number of errors found.
 319  */
 320 static int do_dir(const char *dirname, enum Hash h)
 321 {
 322     BUCKET *bp, *nextbp;
 323     HENTRY *ep, *nextep;
 324     OPENSSL_DIR_CTX *d = NULL;
 325     struct stat st;
 326     unsigned char idmask[MAX_COLLISIONS / 8];
 327     int n, numfiles, nextid, buflen, errs = 0;
 328     size_t i;
 329     const char *pathsep;
 330     const char *filename;
 331     char *buf, *copy = NULL;
 332     STACK_OF(OPENSSL_STRING) *files = NULL;
 333
 334     if (app_access(dirname, W_OK) < 0) {
 335         BIO_printf(bio_err, "Skipping %s, can't write\n", dirname);
 336         return 1;
 337     }
 338     buflen = strlen(dirname);
 339     pathsep = (buflen && !ends_with_dirsep(dirname)) ? "/": "";
 340     buflen += NAME_MAX + 1 + 1;
 341     buf = app_malloc(buflen, "filename buffer");
 342
 343     if (verbose)
 344         BIO_printf(bio_out, "Doing %s\n", dirname);
 345
 346     if ((files = sk_OPENSSL_STRING_new_null()) == NULL) {
 347         BIO_printf(bio_err, "Skipping %s, out of memory\n", dirname);
 348         errs = 1;
 349         goto err;
 350     }
 351     while ((filename = OPENSSL_DIR_read(&d, dirname)) != NULL) {
 352         if ((copy = OPENSSL_strdup(filename)) == NULL
 353                 || sk_OPENSSL_STRING_push(files, copy) == 0) {
 354             OPENSSL_free(copy);
 355             BIO_puts(bio_err, "out of memory\n");
 356             errs = 1;
 357             goto err;
 358         }
 359     }
 360     OPENSSL_DIR_end(&d);
 361     sk_OPENSSL_STRING_sort(files);
 362
 363     numfiles = sk_OPENSSL_STRING_num(files);
 364     for (n = 0; n < numfiles; ++n) {
 365         filename = sk_OPENSSL_STRING_value(files, n);
 366         if (BIO_snprintf(buf, buflen, "%s%s%s",
 367                          dirname, pathsep, filename) >= buflen)
 368             continue;
 369         if (lstat(buf, &st) < 0)
 370             continue;
 371         if (S_ISLNK(st.st_mode) && handle_symlink(filename, buf) == 0)
 372             continue;
 373         errs += do_file(filename, buf, h);
 374     }
 375
 376     for (i = 0; i < OSSL_NELEM(hash_table); i++) {
 377         for (bp = hash_table[i]; bp; bp = nextbp) {
 378             nextbp = bp->next;
 379             nextid = 0;
 380             memset(idmask, 0, (bp->num_needed + 7) / 8);
 381             for (ep = bp->first_entry; ep; ep = ep->next)
 382                 if (ep->old_id < bp->num_needed)
 383                     bit_set(idmask, ep->old_id);
 384
 385             for (ep = bp->first_entry; ep; ep = nextep) {
 386                 nextep = ep->next;
 387                 if (ep->old_id < bp->num_needed) {
 388                     /* Link exists, and is used as-is */
 389                     BIO_snprintf(buf, buflen, "%08x.%s%d", bp->hash,
 390                                  suffixes[bp->type], ep->old_id);
 391                     if (verbose)
 392                         BIO_printf(bio_out, "link %s -> %s\n",
 393                                    ep->filename, buf);
 394                 } else if (ep->need_symlink) {
 395                     /* New link needed (it may replace something) */
 396                     while (bit_isset(idmask, nextid))
 397                         nextid++;
 398
 399                     BIO_snprintf(buf, buflen, "%s%s%n%08x.%s%d",
 400                                  dirname, pathsep, &n, bp->hash,
 401                                  suffixes[bp->type], nextid);
 402                     if (verbose)
 403                         BIO_printf(bio_out, "link %s -> %s\n",
 404                                    ep->filename, &buf[n]);
 405                     if (unlink(buf) < 0 && errno != ENOENT) {
 406                         BIO_printf(bio_err,
 407                                    "%s: Can't unlink %s, %s\n",
 408                                    opt_getprog(), buf, strerror(errno));
 409                         errs++;
 410                     }
 411                     if (symlink(ep->filename, buf) < 0) {
 412                         BIO_printf(bio_err,
 413                                    "%s: Can't symlink %s, %s\n",
 414                                    opt_getprog(), ep->filename,
 415                                    strerror(errno));
 416                         errs++;
 417                     }
 418                     bit_set(idmask, nextid);
 419                 } else if (remove_links) {
 420                     /* Link to be deleted */
 421                     BIO_snprintf(buf, buflen, "%s%s%n%08x.%s%d",
 422                                  dirname, pathsep, &n, bp->hash,
 423                                  suffixes[bp->type], ep->old_id);
 424                     if (verbose)
 425                         BIO_printf(bio_out, "unlink %s\n",
 426                                    &buf[n]);
 427                     if (unlink(buf) < 0 && errno != ENOENT) {
 428                         BIO_printf(bio_err,
 429                                    "%s: Can't unlink %s, %s\n",
 430                                    opt_getprog(), buf, strerror(errno));
 431                         errs++;
 432                     }
 433                 }
 434                 OPENSSL_free(ep->filename);
 435                 OPENSSL_free(ep);
 436             }
 437             OPENSSL_free(bp);
 438         }
 439         hash_table[i] = NULL;
 440     }
 441
 442  err:
 443     sk_OPENSSL_STRING_pop_free(files, str_free);
 444     OPENSSL_free(buf);
 445     return errs;
 446 }
 447
 448 typedef enum OPTION_choice {
 449     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
 450     OPT_COMPAT, OPT_OLD, OPT_N, OPT_VERBOSE
 451 } OPTION_CHOICE;
 452
 453 const OPTIONS rehash_options[] = {
 454     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [cert-directory...]\n"},
 455     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
 456     {"help", OPT_HELP, '-', "Display this summary"},
 457     {"h", OPT_HELP, '-', "Display this summary"},
 458     {"compat", OPT_COMPAT, '-', "Create both new- and old-style hash links"},
 459     {"old", OPT_OLD, '-', "Use old-style hash to generate links"},
 460     {"n", OPT_N, '-', "Do not remove existing links"},
 461     {"v", OPT_VERBOSE, '-', "Verbose output"},
 462     {NULL}
 463 };
 464
 465
 466 int rehash_main(int argc, char **argv)
 467 {
 468     const char *env, *prog;
 469     char *e, *m;
 470     int errs = 0;
 471     OPTION_CHOICE o;
 472     enum Hash h = HASH_NEW;
 473
 474     prog = opt_init(argc, argv, rehash_options);
 475     while ((o = opt_next()) != OPT_EOF) {
 476         switch (o) {
 477         case OPT_EOF:
 478         case OPT_ERR:
 479             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 480             goto end;
 481         case OPT_HELP:
 482             opt_help(rehash_options);
 483             goto end;
 484         case OPT_COMPAT:
 485             h = HASH_BOTH;
 486             break;
 487         case OPT_OLD:
 488             h = HASH_OLD;
 489             break;
 490         case OPT_N:
 491             remove_links = 0;
 492             break;
 493         case OPT_VERBOSE:
 494             verbose = 1;
 495             break;
 496         }
 497     }
 498     argc = opt_num_rest();
 499     argv = opt_rest();
 500
 501     evpmd = EVP_sha1();
 502     evpmdsize = EVP_MD_size(evpmd);
 503
 504     if (*argv != NULL) {
 505         while (*argv != NULL)
 506             errs += do_dir(*argv++, h);
 507     } else if ((env = getenv(X509_get_default_cert_dir_env())) != NULL) {
 508         char lsc[2] = { LIST_SEPARATOR_CHAR, '\0' };
 509         m = OPENSSL_strdup(env);
 510         for (e = strtok(m, lsc); e != NULL; e = strtok(NULL, lsc))
 511             errs += do_dir(e, h);
 512         OPENSSL_free(m);
 513     } else {
 514         errs += do_dir(X509_get_default_cert_dir(), h);
 515     }
 516
 517  end:
 518     return errs;
 519 }
 520
 521 #else
 522 const OPTIONS rehash_options[] = {
 523     {NULL}
 524 };
 525
 526 int rehash_main(int argc, char **argv)
 527 {
 528     BIO_printf(bio_err, "Not available; use c_rehash script\n");
 529     return 1;
 530 }
 531
 532 #endif /* defined(OPENSSL_SYS_UNIX) || defined(__APPLE__) */