Timo Teras | 8f6f144 | 2015-05-07 12:48:47 -0400 | [diff] [blame] | 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 | * All rights reserved. |
| 6 | */ |
| 7 | /* ==================================================================== |
| 8 | * Copyright (c) 2015 The OpenSSL Project. All rights reserved. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * |
| 17 | * 2. Redistributions in binary form must reproduce the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer in |
| 19 | * the documentation and/or other materials provided with the |
| 20 | * distribution. |
| 21 | * |
| 22 | * 3. All advertising materials mentioning features or use of this |
| 23 | * software must display the following acknowledgment: |
| 24 | * "This product includes software developed by the OpenSSL Project |
| 25 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 26 | * |
| 27 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 28 | * endorse or promote products derived from this software without |
| 29 | * prior written permission. For written permission, please contact |
| 30 | * licensing@OpenSSL.org. |
| 31 | * |
| 32 | * 5. Products derived from this software may not be called "OpenSSL" |
| 33 | * nor may "OpenSSL" appear in their names without prior written |
| 34 | * permission of the OpenSSL Project. |
| 35 | * |
| 36 | * 6. Redistributions of any form whatsoever must retain the following |
| 37 | * acknowledgment: |
| 38 | * "This product includes software developed by the OpenSSL Project |
| 39 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 40 | * |
| 41 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 42 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 44 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 45 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 46 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 47 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 48 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 49 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 50 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 51 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 52 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 53 | * ==================================================================== |
| 54 | * |
| 55 | * This product includes cryptographic software written by Eric Young |
| 56 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 57 | * Hudson (tjh@cryptsoft.com). |
| 58 | * |
| 59 | */ |
| 60 | |
| 61 | #include "apps.h" |
| 62 | |
| 63 | #ifdef unix |
| 64 | # include <unistd.h> |
| 65 | # include <stdio.h> |
| 66 | # include <limits.h> |
| 67 | # include <errno.h> |
| 68 | # include <string.h> |
| 69 | # include <ctype.h> |
| 70 | # include <sys/stat.h> |
| 71 | |
| 72 | # include "internal/o_dir.h" |
| 73 | # include <openssl/evp.h> |
| 74 | # include <openssl/pem.h> |
| 75 | # include <openssl/x509.h> |
| 76 | |
| 77 | |
| 78 | # define MAX_COLLISIONS 256 |
| 79 | |
| 80 | typedef struct hentry_st { |
| 81 | struct hentry_st *next; |
| 82 | char *filename; |
| 83 | unsigned short old_id; |
| 84 | unsigned char need_symlink; |
| 85 | unsigned char digest[EVP_MAX_MD_SIZE]; |
| 86 | } HENTRY; |
| 87 | |
| 88 | typedef struct bucket_st { |
| 89 | struct bucket_st *next; |
| 90 | HENTRY *first_entry, *last_entry; |
| 91 | unsigned int hash; |
| 92 | unsigned short type; |
| 93 | unsigned short num_needed; |
| 94 | } BUCKET; |
| 95 | |
| 96 | enum Type { |
| 97 | /* Keep in sync with |suffixes|, below. */ |
| 98 | TYPE_CERT=0, TYPE_CRL=1 |
| 99 | }; |
| 100 | |
| 101 | enum Hash { |
| 102 | HASH_OLD, HASH_NEW, HASH_BOTH |
| 103 | }; |
| 104 | |
| 105 | |
| 106 | static int evpmdsize; |
| 107 | static const EVP_MD *evpmd; |
| 108 | static int remove_links = 1; |
| 109 | static int verbose = 0; |
| 110 | static BUCKET *hash_table[257]; |
| 111 | |
| 112 | static const char *suffixes[] = { "", "r" }; |
| 113 | static const char *extensions[] = { "pem", "crt", "cer", "crl" }; |
| 114 | |
| 115 | |
| 116 | static void bit_set(unsigned char *set, unsigned int bit) |
| 117 | { |
| 118 | set[bit >> 3] |= 1 << (bit & 0x7); |
| 119 | } |
| 120 | |
| 121 | static int bit_isset(unsigned char *set, unsigned int bit) |
| 122 | { |
| 123 | return set[bit >> 3] & (1 << (bit & 0x7)); |
| 124 | } |
| 125 | |
| 126 | |
| 127 | static void add_entry(enum Type type, unsigned int hash, const char *filename, |
| 128 | const unsigned char *digest, int need_symlink, |
| 129 | unsigned short old_id) |
| 130 | { |
| 131 | static BUCKET nilbucket; |
| 132 | static HENTRY nilhentry; |
| 133 | BUCKET *bp; |
| 134 | HENTRY *ep, *found = NULL; |
| 135 | unsigned int ndx = (type + hash) % OSSL_NELEM(hash_table); |
| 136 | |
| 137 | for (bp = hash_table[ndx]; bp; bp = bp->next) |
| 138 | if (bp->type == type && bp->hash == hash) |
| 139 | break; |
| 140 | if (bp == NULL) { |
| 141 | bp = app_malloc(sizeof(*bp), "hash bucket"); |
| 142 | *bp = nilbucket; |
| 143 | bp->next = hash_table[ndx]; |
| 144 | bp->type = type; |
| 145 | bp->hash = hash; |
| 146 | hash_table[ndx] = bp; |
| 147 | } |
| 148 | |
| 149 | for (ep = bp->first_entry; ep; ep = ep->next) { |
| 150 | if (digest && memcmp(digest, ep->digest, evpmdsize) == 0) { |
| 151 | BIO_printf(bio_err, |
| 152 | "%s: skipping duplicate certificate in %s\n", |
| 153 | opt_getprog(), filename); |
| 154 | return; |
| 155 | } |
| 156 | if (strcmp(filename, ep->filename) == 0) { |
| 157 | found = ep; |
| 158 | if (digest == NULL) |
| 159 | break; |
| 160 | } |
| 161 | } |
| 162 | ep = found; |
| 163 | if (ep == NULL) { |
| 164 | if (bp->num_needed >= MAX_COLLISIONS) |
| 165 | return; |
| 166 | ep = app_malloc(sizeof(*ep), "collision bucket"); |
| 167 | *ep = nilhentry; |
| 168 | ep->old_id = ~0; |
| 169 | ep->filename = BUF_strdup(filename); |
| 170 | if (bp->last_entry) |
| 171 | bp->last_entry->next = ep; |
| 172 | if (bp->first_entry == NULL) |
| 173 | bp->first_entry = ep; |
| 174 | bp->last_entry = ep; |
| 175 | } |
| 176 | |
| 177 | if (old_id < ep->old_id) |
| 178 | ep->old_id = old_id; |
| 179 | if (need_symlink && !ep->need_symlink) { |
| 180 | ep->need_symlink = 1; |
| 181 | bp->num_needed++; |
| 182 | memcpy(ep->digest, digest, evpmdsize); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | static int handle_symlink(const char *filename, const char *fullpath) |
| 187 | { |
| 188 | unsigned int hash = 0; |
| 189 | int i, type, id; |
| 190 | unsigned char ch; |
| 191 | char linktarget[NAME_MAX], *endptr; |
| 192 | ssize_t n; |
| 193 | |
| 194 | for (i = 0; i < 8; i++) { |
| 195 | ch = filename[i]; |
| 196 | if (!isxdigit(ch)) |
| 197 | return -1; |
| 198 | hash <<= 4; |
| 199 | hash += app_hex(ch); |
| 200 | } |
| 201 | if (filename[i++] != '.') |
| 202 | return -1; |
| 203 | for (type = OSSL_NELEM(suffixes) - 1; type > 0; type--) |
| 204 | if (strcasecmp(suffixes[type], &filename[i]) == 0) |
| 205 | break; |
| 206 | i += strlen(suffixes[type]); |
| 207 | |
| 208 | id = strtoul(&filename[i], &endptr, 10); |
| 209 | if (*endptr != '\0') |
| 210 | return -1; |
| 211 | |
| 212 | n = readlink(fullpath, linktarget, sizeof(linktarget)); |
| 213 | if (n < 0 || n >= (int)sizeof(linktarget)) |
| 214 | return -1; |
| 215 | linktarget[n] = 0; |
| 216 | |
| 217 | add_entry(type, hash, linktarget, NULL, 0, id); |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | static int do_file(const char *filename, const char *fullpath, enum Hash h) |
| 222 | { |
| 223 | STACK_OF (X509_INFO) *inf; |
| 224 | X509_INFO *x; |
| 225 | X509_NAME *name = NULL; |
| 226 | BIO *b; |
| 227 | const char *ext; |
| 228 | unsigned char digest[EVP_MAX_MD_SIZE]; |
| 229 | int i, type, ret = -1; |
| 230 | |
| 231 | if ((ext = strrchr(filename, '.')) == NULL) |
| 232 | return 0; |
| 233 | for (i = 0; i < (int)OSSL_NELEM(extensions); i++) { |
| 234 | if (strcasecmp(extensions[i], ext + 1) == 0) |
| 235 | break; |
| 236 | } |
| 237 | if (i >= (int)OSSL_NELEM(extensions)) |
| 238 | return -1; |
| 239 | |
| 240 | if ((b = BIO_new_file(fullpath, "r")) == NULL) |
| 241 | return -1; |
| 242 | inf = PEM_X509_INFO_read_bio(b, NULL, NULL, NULL); |
| 243 | BIO_free(b); |
| 244 | if (inf == NULL) |
| 245 | return -1; |
| 246 | |
| 247 | if (sk_X509_INFO_num(inf) != 1) { |
| 248 | BIO_printf(bio_err, |
| 249 | "%s: skipping %s," |
| 250 | "it does not contain exactly one certificate or CRL\n", |
| 251 | opt_getprog(), filename); |
| 252 | goto end; |
| 253 | } |
| 254 | x = sk_X509_INFO_value(inf, 0); |
| 255 | if (x->x509) { |
| 256 | type = TYPE_CERT; |
| 257 | name = X509_get_subject_name(x->x509); |
| 258 | X509_digest(x->x509, evpmd, digest, NULL); |
| 259 | } else if (x->crl) { |
| 260 | type = TYPE_CRL; |
| 261 | name = X509_CRL_get_issuer(x->crl); |
| 262 | X509_CRL_digest(x->crl, evpmd, digest, NULL); |
| 263 | } |
| 264 | if (name) { |
| 265 | if ((h == HASH_NEW) || (h == HASH_BOTH)) |
| 266 | add_entry(type, X509_NAME_hash(name), filename, digest, 1, ~0); |
| 267 | if ((h == HASH_OLD) || (h == HASH_BOTH)) |
| 268 | add_entry(type, X509_NAME_hash_old(name), filename, digest, 1, ~0); |
| 269 | } |
| 270 | |
| 271 | end: |
| 272 | sk_X509_INFO_pop_free(inf, X509_INFO_free); |
| 273 | return ret; |
| 274 | } |
| 275 | |
| 276 | static int do_dir(const char *dirname, enum Hash h) |
| 277 | { |
| 278 | BUCKET *bp, *nextbp; |
| 279 | HENTRY *ep, *nextep; |
| 280 | OPENSSL_DIR_CTX *d = NULL; |
| 281 | struct stat st; |
| 282 | unsigned char idmask[MAX_COLLISIONS / 8]; |
| 283 | int i, n, nextid, buflen, ret = -1; |
| 284 | const char *pathsep; |
| 285 | const char *filename; |
| 286 | char *buf; |
| 287 | |
| 288 | buflen = strlen(dirname); |
| 289 | pathsep = (buflen && dirname[buflen - 1] == '/') ? "" : "/"; |
| 290 | buflen += NAME_MAX + 2; |
| 291 | buf = app_malloc(buflen, "filename buffer"); |
| 292 | |
| 293 | if (verbose) |
| 294 | BIO_printf(bio_out, "Doing %s\n", dirname); |
| 295 | |
| 296 | while ((filename = OPENSSL_DIR_read(&d, dirname)) != NULL) { |
| 297 | if (snprintf(buf, buflen, "%s%s%s", |
| 298 | dirname, pathsep, filename) >= buflen) |
| 299 | continue; |
| 300 | if (lstat(buf, &st) < 0) |
| 301 | continue; |
| 302 | if (S_ISLNK(st.st_mode) && handle_symlink(filename, buf) == 0) |
| 303 | continue; |
| 304 | do_file(filename, buf, h); |
| 305 | } |
| 306 | OPENSSL_DIR_end(&d); |
| 307 | |
| 308 | for (i = 0; i < (int)OSSL_NELEM(hash_table); i++) { |
| 309 | for (bp = hash_table[i]; bp; bp = nextbp) { |
| 310 | nextbp = bp->next; |
| 311 | nextid = 0; |
| 312 | memset(idmask, 0, (bp->num_needed + 7) / 8); |
| 313 | for (ep = bp->first_entry; ep; ep = ep->next) |
| 314 | if (ep->old_id < bp->num_needed) |
| 315 | bit_set(idmask, ep->old_id); |
| 316 | |
| 317 | for (ep = bp->first_entry; ep; ep = nextep) { |
| 318 | nextep = ep->next; |
| 319 | if (ep->old_id < bp->num_needed) { |
| 320 | /* Link exists, and is used as-is */ |
| 321 | snprintf(buf, buflen, "%08x.%s%d", bp->hash, |
| 322 | suffixes[bp->type], ep->old_id); |
| 323 | if (verbose) |
| 324 | BIO_printf(bio_out, "link %s -> %s\n", |
| 325 | ep->filename, buf); |
| 326 | } else if (ep->need_symlink) { |
| 327 | /* New link needed (it may replace something) */ |
| 328 | while (bit_isset(idmask, nextid)) |
| 329 | nextid++; |
| 330 | |
| 331 | snprintf(buf, buflen, "%s%s%n%08x.%s%d", |
| 332 | dirname, pathsep, &n, bp->hash, |
| 333 | suffixes[bp->type], nextid); |
| 334 | if (verbose) |
| 335 | BIO_printf(bio_out, "link %s -> %s\n", |
| 336 | ep->filename, &buf[n]); |
| 337 | if (unlink(buf) < 0 && errno != ENOENT) |
| 338 | BIO_printf(bio_err, |
| 339 | "%s: Can't unlink %s, %s\n", |
| 340 | opt_getprog(), buf, strerror(errno)); |
| 341 | if (symlink(ep->filename, buf) < 0) |
| 342 | BIO_printf(bio_err, |
| 343 | "%s: Can't symlink %s, %s\n", |
| 344 | opt_getprog(), ep->filename, |
| 345 | strerror(errno)); |
| 346 | } else if (remove_links) { |
| 347 | /* Link to be deleted */ |
| 348 | snprintf(buf, buflen, "%s%s%n%08x.%s%d", |
| 349 | dirname, pathsep, &n, bp->hash, |
| 350 | suffixes[bp->type], ep->old_id); |
| 351 | if (verbose) |
| 352 | BIO_printf(bio_out, "unlink %s\n", |
| 353 | &buf[n]); |
| 354 | if (unlink(buf) < 0 && errno != ENOENT) |
| 355 | BIO_printf(bio_err, |
| 356 | "%s: Can't unlink %s, %s\n", |
| 357 | opt_getprog(), buf, strerror(errno)); |
| 358 | } |
| 359 | OPENSSL_free(ep->filename); |
| 360 | OPENSSL_free(ep); |
| 361 | } |
| 362 | OPENSSL_free(bp); |
| 363 | } |
| 364 | hash_table[i] = NULL; |
| 365 | } |
| 366 | ret = 0; |
| 367 | |
| 368 | OPENSSL_free(buf); |
| 369 | return ret; |
| 370 | } |
| 371 | |
| 372 | typedef enum OPTION_choice { |
| 373 | OPT_ERR = -1, OPT_EOF = 0, OPT_HELP, |
| 374 | OPT_COMPAT, OPT_OLD, OPT_N, OPT_VERBOSE |
| 375 | } OPTION_CHOICE; |
| 376 | |
| 377 | OPTIONS rehash_options[] = { |
| 378 | {OPT_HELP_STR, 1, '-', "Usage: %s [options] [cert-directory...]\n"}, |
| 379 | {OPT_HELP_STR, 1, '-', "Valid options are:\n"}, |
| 380 | {"help", OPT_HELP, '-', "Display this summary"}, |
| 381 | {"compat", OPT_COMPAT, '-', "Create both new- and old-style hash links"}, |
| 382 | {"old", OPT_OLD, '-', "Use old-style hash to generate links"}, |
| 383 | {"n", OPT_N, '-', "Do not remove existing links"}, |
| 384 | {"v", OPT_VERBOSE, '-', "Verbose output"}, |
| 385 | {NULL} |
| 386 | }; |
| 387 | |
| 388 | |
| 389 | int rehash_main(int argc, char **argv) |
| 390 | { |
| 391 | const char *env, *prog; |
| 392 | char *e, *m; |
| 393 | int ret = 0; |
| 394 | OPTION_CHOICE o; |
| 395 | enum Hash h = HASH_NEW; |
| 396 | |
| 397 | prog = opt_init(argc, argv, rehash_options); |
| 398 | while ((o = opt_next()) != OPT_EOF) { |
| 399 | switch (o) { |
| 400 | case OPT_EOF: |
| 401 | case OPT_ERR: |
| 402 | BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); |
| 403 | goto end; |
| 404 | case OPT_HELP: |
| 405 | opt_help(rehash_options); |
| 406 | goto end; |
| 407 | case OPT_COMPAT: |
| 408 | h = HASH_BOTH; |
| 409 | break; |
| 410 | case OPT_OLD: |
| 411 | h = HASH_OLD; |
| 412 | break; |
| 413 | case OPT_N: |
| 414 | remove_links = 0; |
| 415 | break; |
| 416 | case OPT_VERBOSE: |
| 417 | verbose = 1; |
| 418 | break; |
| 419 | } |
| 420 | } |
| 421 | argc = opt_num_rest(); |
| 422 | argv = opt_rest(); |
| 423 | |
| 424 | evpmd = EVP_sha1(); |
| 425 | evpmdsize = EVP_MD_size(evpmd); |
| 426 | |
| 427 | if (*argv) { |
| 428 | while (*argv) |
| 429 | ret |= do_dir(*argv++, h); |
| 430 | } else if ((env = getenv("SSL_CERT_DIR")) != NULL) { |
| 431 | m = BUF_strdup(env); |
| 432 | for (e = strtok(m, ":"); e != NULL; e = strtok(NULL, ":")) |
| 433 | ret |= do_dir(e, h); |
| 434 | OPENSSL_free(m); |
| 435 | } else { |
| 436 | ret |= do_dir("/etc/ssl/certs", h); |
| 437 | } |
| 438 | |
| 439 | end: |
| 440 | return ret ? 2 : 0; |
| 441 | } |
| 442 | |
| 443 | #else |
Rich Salz | 62fdf4e | 2015-09-06 21:39:26 -0400 | [diff] [blame^] | 444 | OPTIONS rehash_options[] = { |
| 445 | {NULL} |
| 446 | }; |
Timo Teras | 8f6f144 | 2015-05-07 12:48:47 -0400 | [diff] [blame] | 447 | |
| 448 | int rehash_main(int argc, char **argv) |
| 449 | { |
Rich Salz | 9e0da06 | 2015-09-06 19:01:24 -0400 | [diff] [blame] | 450 | BIO_printf(bio_err, "Not available; use c_rehash script\n"); |
Timo Teras | 8f6f144 | 2015-05-07 12:48:47 -0400 | [diff] [blame] | 451 | return (1); |
| 452 | } |
| 453 | |
| 454 | #endif |