apps/rehash.c

   1 /*
   2  * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * C implementation based on the original Perl and shell versions
  12  *
  13  * Copyright (c) 2013-2014 Timo Teräs <timo.teras@iki.fi>
  14  */
  15
  16 #include "apps.h"
  17
  18 #if defined(OPENSSL_SYS_UNIX) || defined(__APPLE__) || \
  19     (defined(__VMS) && defined(__DECC) && __CRTL_VER >= 80300000)
  20 # include <unistd.h>
  21 # include <stdio.h>
  22 # include <limits.h>
  23 # include <errno.h>
  24 # include <string.h>
  25 # include <ctype.h>
  26 # include <sys/stat.h>
  27
  28 /*
  29  * Make sure that the processing of symbol names is treated the same as when
  30  * libcrypto is built.  This is done automatically for public headers (see
  31  * include/openssl/__DECC_INCLUDE_PROLOGUE.H and __DECC_INCLUDE_EPILOGUE.H),
  32  * but not for internal headers.
  33  */
  34 # ifdef __VMS
  35 #  pragma names save
  36 #  pragma names as_is,shortened
  37 # endif
  38
  39 # include "internal/o_dir.h"
  40
  41 # ifdef __VMS
  42 #  pragma names restore
  43 # endif
  44
  45 # include <openssl/evp.h>
  46 # include <openssl/pem.h>
  47 # include <openssl/x509.h>
  48
  49
  50 # ifndef PATH_MAX
  51 #  define PATH_MAX 4096
  52 # endif
  53 # ifndef NAME_MAX
  54 #  define NAME_MAX 255
  55 # endif
  56 # define MAX_COLLISIONS  256
  57
  58 typedef struct hentry_st {
  59     struct hentry_st *next;
  60     char *filename;
  61     unsigned short old_id;
  62     unsigned char need_symlink;
  63     unsigned char digest[EVP_MAX_MD_SIZE];
  64 } HENTRY;
  65
  66 typedef struct bucket_st {
  67     struct bucket_st *next;
  68     HENTRY *first_entry, *last_entry;
  69     unsigned int hash;
  70     unsigned short type;
  71     unsigned short num_needed;
  72 } BUCKET;
  73
  74 enum Type {
  75     /* Keep in sync with |suffixes|, below. */
  76     TYPE_CERT=0, TYPE_CRL=1
  77 };
  78
  79 enum Hash {
  80     HASH_OLD, HASH_NEW, HASH_BOTH
  81 };
  82
  83
  84 static int evpmdsize;
  85 static const EVP_MD *evpmd;
  86 static int remove_links = 1;
  87 static int verbose = 0;
  88 static BUCKET *hash_table[257];
  89
  90 static const char *suffixes[] = { "", "r" };
  91 static const char *extensions[] = { "pem", "crt", "cer", "crl" };
  92
  93
  94 static void bit_set(unsigned char *set, unsigned int bit)
  95 {
  96     set[bit >> 3] |= 1 << (bit & 0x7);
  97 }
  98
  99 static int bit_isset(unsigned char *set, unsigned int bit)
 100 {
 101     return set[bit >> 3] & (1 << (bit & 0x7));
 102 }
 103
 104
 105 /*
 106  * Process an entry; return number of errors.
 107  */
 108 static int add_entry(enum Type type, unsigned int hash, const char *filename,
 109                       const unsigned char *digest, int need_symlink,
 110                       unsigned short old_id)
 111 {
 112     static BUCKET nilbucket;
 113     static HENTRY nilhentry;
 114     BUCKET *bp;
 115     HENTRY *ep, *found = NULL;
 116     unsigned int ndx = (type + hash) % OSSL_NELEM(hash_table);
 117
 118     for (bp = hash_table[ndx]; bp; bp = bp->next)
 119         if (bp->type == type && bp->hash == hash)
 120             break;
 121     if (bp == NULL) {
 122         bp = app_malloc(sizeof(*bp), "hash bucket");
 123         *bp = nilbucket;
 124         bp->next = hash_table[ndx];
 125         bp->type = type;
 126         bp->hash = hash;
 127         hash_table[ndx] = bp;
 128     }
 129
 130     for (ep = bp->first_entry; ep; ep = ep->next) {
 131         if (digest && memcmp(digest, ep->digest, evpmdsize) == 0) {
 132             BIO_printf(bio_err,
 133                        "%s: skipping duplicate %s in %s\n", opt_getprog(),
 134                        type == TYPE_CERT ? "certificate" : "CRL", filename);
 135             return 1;
 136         }
 137         if (strcmp(filename, ep->filename) == 0) {
 138             found = ep;
 139             if (digest == NULL)
 140                 break;
 141         }
 142     }
 143     ep = found;
 144     if (ep == NULL) {
 145         if (bp->num_needed >= MAX_COLLISIONS) {
 146             BIO_printf(bio_err,
 147                        "%s: hash table overflow for %s\n",
 148                        opt_getprog(), filename);
 149             return 1;
 150         }
 151         ep = app_malloc(sizeof(*ep), "collision bucket");
 152         *ep = nilhentry;
 153         ep->old_id = ~0;
 154         ep->filename = OPENSSL_strdup(filename);
 155         if (bp->last_entry)
 156             bp->last_entry->next = ep;
 157         if (bp->first_entry == NULL)
 158             bp->first_entry = ep;
 159         bp->last_entry = ep;
 160     }
 161
 162     if (old_id < ep->old_id)
 163         ep->old_id = old_id;
 164     if (need_symlink && !ep->need_symlink) {
 165         ep->need_symlink = 1;
 166         bp->num_needed++;
 167         memcpy(ep->digest, digest, evpmdsize);
 168     }
 169     return 0;
 170 }
 171
 172 /*
 173  * Check if a symlink goes to the right spot; return 0 if okay.
 174  * This can be -1 if bad filename, or an error count.
 175  */
 176 static int handle_symlink(const char *filename, const char *fullpath)
 177 {
 178     unsigned int hash = 0;
 179     int i, type, id;
 180     unsigned char ch;
 181     char linktarget[PATH_MAX], *endptr;
 182     ossl_ssize_t n;
 183
 184     for (i = 0; i < 8; i++) {
 185         ch = filename[i];
 186         if (!isxdigit(ch))
 187             return -1;
 188         hash <<= 4;
 189         hash += OPENSSL_hexchar2int(ch);
 190     }
 191     if (filename[i++] != '.')
 192         return -1;
 193     for (type = OSSL_NELEM(suffixes) - 1; type > 0; type--) {
 194         const char *suffix = suffixes[type];
 195         if (strncasecmp(suffix, &filename[i], strlen(suffix)) == 0)
 196             break;
 197     }
 198     i += strlen(suffixes[type]);
 199
 200     id = strtoul(&filename[i], &endptr, 10);
 201     if (*endptr != '\0')
 202         return -1;
 203
 204     n = readlink(fullpath, linktarget, sizeof(linktarget));
 205     if (n < 0 || n >= (int)sizeof(linktarget))
 206         return -1;
 207     linktarget[n] = 0;
 208
 209     return add_entry(type, hash, linktarget, NULL, 0, id);
 210 }
 211
 212 /*
 213  * process a file, return number of errors.
 214  */
 215 static int do_file(const char *filename, const char *fullpath, enum Hash h)
 216 {
 217     STACK_OF (X509_INFO) *inf = NULL;
 218     X509_INFO *x;
 219     X509_NAME *name = NULL;
 220     BIO *b;
 221     const char *ext;
 222     unsigned char digest[EVP_MAX_MD_SIZE];
 223     int type, errs = 0;
 224     size_t i;
 225
 226     /* Does it end with a recognized extension? */
 227     if ((ext = strrchr(filename, '.')) == NULL)
 228         goto end;
 229     for (i = 0; i < OSSL_NELEM(extensions); i++) {
 230         if (strcasecmp(extensions[i], ext + 1) == 0)
 231             break;
 232     }
 233     if (i >= OSSL_NELEM(extensions))
 234         goto end;
 235
 236     /* Does it have X.509 data in it? */
 237     if ((b = BIO_new_file(fullpath, "r")) == NULL) {
 238         BIO_printf(bio_err, "%s: skipping %s, cannot open file\n",
 239                    opt_getprog(), filename);
 240         errs++;
 241         goto end;
 242     }
 243     inf = PEM_X509_INFO_read_bio(b, NULL, NULL, NULL);
 244     BIO_free(b);
 245     if (inf == NULL)
 246         goto end;
 247
 248     if (sk_X509_INFO_num(inf) != 1) {
 249         BIO_printf(bio_err,
 250                    "%s: skipping %s,"
 251                    "it does not contain exactly one certificate or CRL\n",
 252                    opt_getprog(), filename);
 253         /* This is not an error. */
 254         goto end;
 255     }
 256     x = sk_X509_INFO_value(inf, 0);
 257     if (x->x509) {
 258         type = TYPE_CERT;
 259         name = X509_get_subject_name(x->x509);
 260         X509_digest(x->x509, evpmd, digest, NULL);
 261     } else if (x->crl) {
 262         type = TYPE_CRL;
 263         name = X509_CRL_get_issuer(x->crl);
 264         X509_CRL_digest(x->crl, evpmd, digest, NULL);
 265     } else {
 266         ++errs;
 267         goto end;
 268     }
 269     if (name) {
 270         if ((h == HASH_NEW) || (h == HASH_BOTH))
 271             errs += add_entry(type, X509_NAME_hash(name), filename, digest, 1, ~0);
 272         if ((h == HASH_OLD) || (h == HASH_BOTH))
 273             errs += add_entry(type, X509_NAME_hash_old(name), filename, digest, 1, ~0);
 274     }
 275
 276 end:
 277     sk_X509_INFO_pop_free(inf, X509_INFO_free);
 278     return errs;
 279 }
 280
 281 static void str_free(char *s)
 282 {
 283     OPENSSL_free(s);
 284 }
 285
 286 static int ends_with_dirsep(const char *path)
 287 {
 288     if (*path != '\0')
 289         path += strlen(path) - 1;
 290 # if defined __VMS
 291     if (*path == ']' || *path == '>' || *path == ':')
 292         return 1;
 293 # elif defined _WIN32
 294     if (*path == '\\')
 295         return 1;
 296 # endif
 297     return *path == '/';
 298 }
 299
 300 static int massage_filename(char *name)
 301 {
 302 # ifdef __VMS
 303     char *p = strchr(name, ';');
 304     char *q = p;
 305
 306     if (q != NULL) {
 307         for (q++; *q != '\0'; q++) {
 308             if (!isdigit(*q))
 309                 return 1;
 310         }
 311     }
 312
 313     *p = '\0';
 314 # endif
 315     return 1;
 316 }
 317
 318 /*
 319  * Process a directory; return number of errors found.
 320  */
 321 static int do_dir(const char *dirname, enum Hash h)
 322 {
 323     BUCKET *bp, *nextbp;
 324     HENTRY *ep, *nextep;
 325     OPENSSL_DIR_CTX *d = NULL;
 326     struct stat st;
 327     unsigned char idmask[MAX_COLLISIONS / 8];
 328     int n, numfiles, nextid, buflen, errs = 0;
 329     size_t i;
 330     const char *pathsep;
 331     const char *filename;
 332     char *buf, *copy;
 333     STACK_OF(OPENSSL_STRING) *files = NULL;
 334
 335     if (app_access(dirname, W_OK) < 0) {
 336         BIO_printf(bio_err, "Skipping %s, can't write\n", dirname);
 337         return 1;
 338     }
 339     buflen = strlen(dirname);
 340     pathsep = (buflen && !ends_with_dirsep(dirname)) ? "/": "";
 341     buflen += NAME_MAX + 1 + 1;
 342     buf = app_malloc(buflen, "filename buffer");
 343
 344     if (verbose)
 345         BIO_printf(bio_out, "Doing %s\n", dirname);
 346
 347     if ((files = sk_OPENSSL_STRING_new_null()) == NULL) {
 348         BIO_printf(bio_err, "Skipping %s, out of memory\n", dirname);
 349         exit(1);
 350     }
 351     while ((filename = OPENSSL_DIR_read(&d, dirname)) != NULL) {
 352         if ((copy = strdup(filename)) == NULL
 353                 || !massage_filename(copy)
 354                 || sk_OPENSSL_STRING_push(files, copy) == 0) {
 355             BIO_puts(bio_err, "out of memory\n");
 356             exit(1);
 357         }
 358     }
 359     OPENSSL_DIR_end(&d);
 360     sk_OPENSSL_STRING_sort(files);
 361
 362     numfiles = sk_OPENSSL_STRING_num(files);
 363     for (n = 0; n < numfiles; ++n) {
 364         filename = sk_OPENSSL_STRING_value(files, n);
 365         if (BIO_snprintf(buf, buflen, "%s%s%s",
 366                          dirname, pathsep, filename) >= buflen)
 367             continue;
 368         if (lstat(buf, &st) < 0)
 369             continue;
 370         if (S_ISLNK(st.st_mode) && handle_symlink(filename, buf) == 0)
 371             continue;
 372         errs += do_file(filename, buf, h);
 373     }
 374     sk_OPENSSL_STRING_pop_free(files, str_free);
 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     OPENSSL_free(buf);
 443     return errs;
 444 }
 445
 446 typedef enum OPTION_choice {
 447     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
 448     OPT_COMPAT, OPT_OLD, OPT_N, OPT_VERBOSE
 449 } OPTION_CHOICE;
 450
 451 const OPTIONS rehash_options[] = {
 452     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [cert-directory...]\n"},
 453     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
 454     {"help", OPT_HELP, '-', "Display this summary"},
 455     {"h", OPT_HELP, '-', "Display this summary"},
 456     {"compat", OPT_COMPAT, '-', "Create both new- and old-style hash links"},
 457     {"old", OPT_OLD, '-', "Use old-style hash to generate links"},
 458     {"n", OPT_N, '-', "Do not remove existing links"},
 459     {"v", OPT_VERBOSE, '-', "Verbose output"},
 460     {NULL}
 461 };
 462
 463
 464 int rehash_main(int argc, char **argv)
 465 {
 466     const char *env, *prog;
 467     char *e, *m;
 468     int errs = 0;
 469     OPTION_CHOICE o;
 470     enum Hash h = HASH_NEW;
 471
 472     prog = opt_init(argc, argv, rehash_options);
 473     while ((o = opt_next()) != OPT_EOF) {
 474         switch (o) {
 475         case OPT_EOF:
 476         case OPT_ERR:
 477             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 478             goto end;
 479         case OPT_HELP:
 480             opt_help(rehash_options);
 481             goto end;
 482         case OPT_COMPAT:
 483             h = HASH_BOTH;
 484             break;
 485         case OPT_OLD:
 486             h = HASH_OLD;
 487             break;
 488         case OPT_N:
 489             remove_links = 0;
 490             break;
 491         case OPT_VERBOSE:
 492             verbose = 1;
 493             break;
 494         }
 495     }
 496     argc = opt_num_rest();
 497     argv = opt_rest();
 498
 499     evpmd = EVP_sha1();
 500     evpmdsize = EVP_MD_size(evpmd);
 501
 502     if (*argv) {
 503         while (*argv)
 504             errs += do_dir(*argv++, h);
 505     } else if ((env = getenv("SSL_CERT_DIR")) != NULL) {
 506         m = OPENSSL_strdup(env);
 507         for (e = strtok(m, ":"); e != NULL; e = strtok(NULL, ":"))
 508             errs += do_dir(e, h);
 509         OPENSSL_free(m);
 510     } else {
 511         errs += do_dir("/etc/ssl/certs", h);
 512     }
 513
 514  end:
 515     return errs;
 516 }
 517
 518 #else
 519 const OPTIONS rehash_options[] = {
 520     {NULL}
 521 };
 522
 523 int rehash_main(int argc, char **argv)
 524 {
 525     BIO_printf(bio_err, "Not available; use c_rehash script\n");
 526     return (1);
 527 }
 528
 529 #endif /* defined(OPENSSL_SYS_UNIX) || defined(__APPLE__) */