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