[331] | 1 | /*
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| 2 | * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * C implementation based on the original Perl and shell versions
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| 12 | *
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| 13 | * Copyright (c) 2013-2014 Timo Ter辰s <timo.teras@iki.fi>
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| 14 | */
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| 15 |
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| 16 | #include "apps.h"
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| 17 |
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| 18 | #if defined(OPENSSL_SYS_UNIX) || defined(__APPLE__) || \
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| 19 | (defined(__VMS) && defined(__DECC) && __CTRL_VER >= 80300000)
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| 20 | # include <unistd.h>
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| 21 | # include <stdio.h>
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| 22 | # include <limits.h>
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| 23 | # include <errno.h>
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| 24 | # include <string.h>
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| 25 | # include <ctype.h>
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| 26 | # include <sys/stat.h>
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| 27 |
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| 28 | # include "internal/o_dir.h"
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| 29 | # include <openssl/evp.h>
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| 30 | # include <openssl/pem.h>
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| 31 | # include <openssl/x509.h>
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| 32 |
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| 33 |
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| 34 | # ifndef PATH_MAX
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| 35 | # define PATH_MAX 4096
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| 36 | # endif
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| 37 | # ifndef NAME_MAX
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| 38 | # define NAME_MAX 255
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| 39 | # endif
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| 40 | # define MAX_COLLISIONS 256
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| 41 |
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| 42 | typedef struct hentry_st {
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| 43 | struct hentry_st *next;
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| 44 | char *filename;
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| 45 | unsigned short old_id;
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| 46 | unsigned char need_symlink;
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| 47 | unsigned char digest[EVP_MAX_MD_SIZE];
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| 48 | } HENTRY;
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| 49 |
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| 50 | typedef struct bucket_st {
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| 51 | struct bucket_st *next;
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| 52 | HENTRY *first_entry, *last_entry;
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| 53 | unsigned int hash;
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| 54 | unsigned short type;
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| 55 | unsigned short num_needed;
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| 56 | } BUCKET;
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| 57 |
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| 58 | enum Type {
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| 59 | /* Keep in sync with |suffixes|, below. */
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| 60 | TYPE_CERT=0, TYPE_CRL=1
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| 61 | };
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| 62 |
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| 63 | enum Hash {
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| 64 | HASH_OLD, HASH_NEW, HASH_BOTH
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| 65 | };
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| 66 |
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| 67 |
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| 68 | static int evpmdsize;
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| 69 | static const EVP_MD *evpmd;
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| 70 | static int remove_links = 1;
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| 71 | static int verbose = 0;
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| 72 | static BUCKET *hash_table[257];
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| 73 |
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| 74 | static const char *suffixes[] = { "", "r" };
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| 75 | static const char *extensions[] = { "pem", "crt", "cer", "crl" };
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| 76 |
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| 77 |
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| 78 | static void bit_set(unsigned char *set, unsigned int bit)
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| 79 | {
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| 80 | set[bit >> 3] |= 1 << (bit & 0x7);
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| 81 | }
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| 82 |
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| 83 | static int bit_isset(unsigned char *set, unsigned int bit)
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| 84 | {
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| 85 | return set[bit >> 3] & (1 << (bit & 0x7));
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| 86 | }
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| 87 |
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| 88 |
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| 89 | /*
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| 90 | * Process an entry; return number of errors.
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| 91 | */
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| 92 | static int add_entry(enum Type type, unsigned int hash, const char *filename,
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| 93 | const unsigned char *digest, int need_symlink,
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| 94 | unsigned short old_id)
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| 95 | {
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| 96 | static BUCKET nilbucket;
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| 97 | static HENTRY nilhentry;
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| 98 | BUCKET *bp;
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| 99 | HENTRY *ep, *found = NULL;
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| 100 | unsigned int ndx = (type + hash) % OSSL_NELEM(hash_table);
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| 101 |
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| 102 | for (bp = hash_table[ndx]; bp; bp = bp->next)
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| 103 | if (bp->type == type && bp->hash == hash)
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| 104 | break;
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| 105 | if (bp == NULL) {
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| 106 | bp = app_malloc(sizeof(*bp), "hash bucket");
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| 107 | *bp = nilbucket;
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| 108 | bp->next = hash_table[ndx];
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| 109 | bp->type = type;
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| 110 | bp->hash = hash;
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| 111 | hash_table[ndx] = bp;
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| 112 | }
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| 113 |
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| 114 | for (ep = bp->first_entry; ep; ep = ep->next) {
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| 115 | if (digest && memcmp(digest, ep->digest, evpmdsize) == 0) {
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| 116 | BIO_printf(bio_err,
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| 117 | "%s: skipping duplicate %s in %s\n", opt_getprog(),
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| 118 | type == TYPE_CERT ? "certificate" : "CRL", filename);
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| 119 | return 1;
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| 120 | }
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| 121 | if (strcmp(filename, ep->filename) == 0) {
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| 122 | found = ep;
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| 123 | if (digest == NULL)
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| 124 | break;
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| 125 | }
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| 126 | }
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| 127 | ep = found;
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| 128 | if (ep == NULL) {
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| 129 | if (bp->num_needed >= MAX_COLLISIONS) {
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| 130 | BIO_printf(bio_err,
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| 131 | "%s: hash table overflow for %s\n",
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| 132 | opt_getprog(), filename);
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| 133 | return 1;
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| 134 | }
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| 135 | ep = app_malloc(sizeof(*ep), "collision bucket");
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| 136 | *ep = nilhentry;
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| 137 | ep->old_id = ~0;
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| 138 | ep->filename = OPENSSL_strdup(filename);
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| 139 | if (bp->last_entry)
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| 140 | bp->last_entry->next = ep;
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| 141 | if (bp->first_entry == NULL)
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| 142 | bp->first_entry = ep;
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| 143 | bp->last_entry = ep;
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| 144 | }
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| 145 |
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| 146 | if (old_id < ep->old_id)
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| 147 | ep->old_id = old_id;
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| 148 | if (need_symlink && !ep->need_symlink) {
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| 149 | ep->need_symlink = 1;
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| 150 | bp->num_needed++;
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| 151 | memcpy(ep->digest, digest, evpmdsize);
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| 152 | }
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| 153 | return 0;
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| 154 | }
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| 155 |
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| 156 | /*
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| 157 | * Check if a symlink goes to the right spot; return 0 if okay.
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| 158 | * This can be -1 if bad filename, or an error count.
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| 159 | */
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| 160 | static int handle_symlink(const char *filename, const char *fullpath)
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| 161 | {
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| 162 | unsigned int hash = 0;
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| 163 | int i, type, id;
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| 164 | unsigned char ch;
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| 165 | char linktarget[PATH_MAX], *endptr;
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| 166 | ossl_ssize_t n;
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| 167 |
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| 168 | for (i = 0; i < 8; i++) {
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| 169 | ch = filename[i];
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| 170 | if (!isxdigit(ch))
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| 171 | return -1;
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| 172 | hash <<= 4;
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| 173 | hash += OPENSSL_hexchar2int(ch);
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| 174 | }
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| 175 | if (filename[i++] != '.')
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| 176 | return -1;
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| 177 | for (type = OSSL_NELEM(suffixes) - 1; type > 0; type--) {
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| 178 | const char *suffix = suffixes[type];
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| 179 | if (strncasecmp(suffix, &filename[i], strlen(suffix)) == 0)
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| 180 | break;
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| 181 | }
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| 182 | i += strlen(suffixes[type]);
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| 183 |
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| 184 | id = strtoul(&filename[i], &endptr, 10);
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| 185 | if (*endptr != '\0')
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| 186 | return -1;
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| 187 |
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| 188 | n = readlink(fullpath, linktarget, sizeof(linktarget));
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| 189 | if (n < 0 || n >= (int)sizeof(linktarget))
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| 190 | return -1;
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| 191 | linktarget[n] = 0;
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| 192 |
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| 193 | return add_entry(type, hash, linktarget, NULL, 0, id);
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| 194 | }
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| 195 |
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| 196 | /*
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| 197 | * process a file, return number of errors.
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| 198 | */
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| 199 | static int do_file(const char *filename, const char *fullpath, enum Hash h)
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| 200 | {
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| 201 | STACK_OF (X509_INFO) *inf = NULL;
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| 202 | X509_INFO *x;
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| 203 | X509_NAME *name = NULL;
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| 204 | BIO *b;
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| 205 | const char *ext;
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| 206 | unsigned char digest[EVP_MAX_MD_SIZE];
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| 207 | int type, errs = 0;
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| 208 | size_t i;
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| 209 |
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| 210 | /* Does it end with a recognized extension? */
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| 211 | if ((ext = strrchr(filename, '.')) == NULL)
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| 212 | goto end;
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| 213 | for (i = 0; i < OSSL_NELEM(extensions); i++) {
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| 214 | if (strcasecmp(extensions[i], ext + 1) == 0)
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| 215 | break;
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| 216 | }
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| 217 | if (i >= OSSL_NELEM(extensions))
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| 218 | goto end;
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| 219 |
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| 220 | /* Does it have X.509 data in it? */
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| 221 | if ((b = BIO_new_file(fullpath, "r")) == NULL) {
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| 222 | BIO_printf(bio_err, "%s: skipping %s, cannot open file\n",
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| 223 | opt_getprog(), filename);
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| 224 | errs++;
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| 225 | goto end;
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| 226 | }
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| 227 | inf = PEM_X509_INFO_read_bio(b, NULL, NULL, NULL);
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| 228 | BIO_free(b);
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| 229 | if (inf == NULL)
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| 230 | goto end;
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| 231 |
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| 232 | if (sk_X509_INFO_num(inf) != 1) {
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| 233 | BIO_printf(bio_err,
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| 234 | "%s: skipping %s,"
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| 235 | "it does not contain exactly one certificate or CRL\n",
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| 236 | opt_getprog(), filename);
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| 237 | /* This is not an error. */
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| 238 | goto end;
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| 239 | }
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| 240 | x = sk_X509_INFO_value(inf, 0);
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| 241 | if (x->x509) {
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| 242 | type = TYPE_CERT;
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| 243 | name = X509_get_subject_name(x->x509);
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| 244 | X509_digest(x->x509, evpmd, digest, NULL);
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| 245 | } else if (x->crl) {
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| 246 | type = TYPE_CRL;
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| 247 | name = X509_CRL_get_issuer(x->crl);
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| 248 | X509_CRL_digest(x->crl, evpmd, digest, NULL);
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| 249 | } else {
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| 250 | ++errs;
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| 251 | goto end;
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| 252 | }
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| 253 | if (name) {
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| 254 | if ((h == HASH_NEW) || (h == HASH_BOTH))
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| 255 | errs += add_entry(type, X509_NAME_hash(name), filename, digest, 1, ~0);
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| 256 | if ((h == HASH_OLD) || (h == HASH_BOTH))
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| 257 | errs += add_entry(type, X509_NAME_hash_old(name), filename, digest, 1, ~0);
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| 258 | }
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| 259 |
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| 260 | end:
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| 261 | sk_X509_INFO_pop_free(inf, X509_INFO_free);
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| 262 | return errs;
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| 263 | }
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| 264 |
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| 265 | static void str_free(char *s)
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| 266 | {
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| 267 | OPENSSL_free(s);
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| 268 | }
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| 269 |
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| 270 | /*
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| 271 | * Process a directory; return number of errors found.
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| 272 | */
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| 273 | static int do_dir(const char *dirname, enum Hash h)
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| 274 | {
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| 275 | BUCKET *bp, *nextbp;
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| 276 | HENTRY *ep, *nextep;
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| 277 | OPENSSL_DIR_CTX *d = NULL;
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| 278 | struct stat st;
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| 279 | unsigned char idmask[MAX_COLLISIONS / 8];
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| 280 | int n, numfiles, nextid, buflen, errs = 0;
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| 281 | size_t i;
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| 282 | const char *pathsep;
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| 283 | const char *filename;
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| 284 | char *buf, *copy;
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| 285 | STACK_OF(OPENSSL_STRING) *files = NULL;
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| 286 |
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| 287 | if (app_access(dirname, W_OK) < 0) {
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| 288 | BIO_printf(bio_err, "Skipping %s, can't write\n", dirname);
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| 289 | return 1;
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| 290 | }
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| 291 | buflen = strlen(dirname);
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| 292 | pathsep = (buflen && dirname[buflen - 1] == '/') ? "" : "/";
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| 293 | buflen += NAME_MAX + 1 + 1;
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| 294 | buf = app_malloc(buflen, "filename buffer");
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| 295 |
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| 296 | if (verbose)
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| 297 | BIO_printf(bio_out, "Doing %s\n", dirname);
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| 298 |
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| 299 | if ((files = sk_OPENSSL_STRING_new_null()) == NULL) {
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| 300 | BIO_printf(bio_err, "Skipping %s, out of memory\n", dirname);
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| 301 | exit(1);
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| 302 | }
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| 303 | while ((filename = OPENSSL_DIR_read(&d, dirname)) != NULL) {
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| 304 | if ((copy = strdup(filename)) == NULL
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| 305 | || sk_OPENSSL_STRING_push(files, copy) == 0) {
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| 306 | BIO_puts(bio_err, "out of memory\n");
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| 307 | exit(1);
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| 308 | }
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| 309 | }
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| 310 | OPENSSL_DIR_end(&d);
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| 311 | sk_OPENSSL_STRING_sort(files);
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| 312 |
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| 313 | numfiles = sk_OPENSSL_STRING_num(files);
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| 314 | for (n = 0; n < numfiles; ++n) {
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| 315 | filename = sk_OPENSSL_STRING_value(files, n);
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| 316 | if (snprintf(buf, buflen, "%s%s%s",
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| 317 | dirname, pathsep, filename) >= buflen)
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| 318 | continue;
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| 319 | if (lstat(buf, &st) < 0)
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| 320 | continue;
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| 321 | if (S_ISLNK(st.st_mode) && handle_symlink(filename, buf) == 0)
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| 322 | continue;
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| 323 | errs += do_file(filename, buf, h);
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| 324 | }
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| 325 | sk_OPENSSL_STRING_pop_free(files, str_free);
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| 326 |
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| 327 | for (i = 0; i < OSSL_NELEM(hash_table); i++) {
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| 328 | for (bp = hash_table[i]; bp; bp = nextbp) {
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| 329 | nextbp = bp->next;
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| 330 | nextid = 0;
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| 331 | memset(idmask, 0, (bp->num_needed + 7) / 8);
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| 332 | for (ep = bp->first_entry; ep; ep = ep->next)
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| 333 | if (ep->old_id < bp->num_needed)
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| 334 | bit_set(idmask, ep->old_id);
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| 335 |
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| 336 | for (ep = bp->first_entry; ep; ep = nextep) {
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| 337 | nextep = ep->next;
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| 338 | if (ep->old_id < bp->num_needed) {
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| 339 | /* Link exists, and is used as-is */
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| 340 | snprintf(buf, buflen, "%08x.%s%d", bp->hash,
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| 341 | suffixes[bp->type], ep->old_id);
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| 342 | if (verbose)
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| 343 | BIO_printf(bio_out, "link %s -> %s\n",
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| 344 | ep->filename, buf);
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| 345 | } else if (ep->need_symlink) {
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| 346 | /* New link needed (it may replace something) */
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| 347 | while (bit_isset(idmask, nextid))
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| 348 | nextid++;
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| 349 |
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| 350 | snprintf(buf, buflen, "%s%s%n%08x.%s%d",
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| 351 | dirname, pathsep, &n, bp->hash,
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| 352 | suffixes[bp->type], nextid);
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| 353 | if (verbose)
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| 354 | BIO_printf(bio_out, "link %s -> %s\n",
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| 355 | ep->filename, &buf[n]);
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| 356 | if (unlink(buf) < 0 && errno != ENOENT) {
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| 357 | BIO_printf(bio_err,
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| 358 | "%s: Can't unlink %s, %s\n",
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| 359 | opt_getprog(), buf, strerror(errno));
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| 360 | errs++;
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| 361 | }
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| 362 | if (symlink(ep->filename, buf) < 0) {
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| 363 | BIO_printf(bio_err,
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| 364 | "%s: Can't symlink %s, %s\n",
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| 365 | opt_getprog(), ep->filename,
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| 366 | strerror(errno));
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| 367 | errs++;
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| 368 | }
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| 369 | bit_set(idmask, nextid);
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| 370 | } else if (remove_links) {
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| 371 | /* Link to be deleted */
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| 372 | snprintf(buf, buflen, "%s%s%n%08x.%s%d",
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| 373 | dirname, pathsep, &n, bp->hash,
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| 374 | suffixes[bp->type], ep->old_id);
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| 375 | if (verbose)
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| 376 | BIO_printf(bio_out, "unlink %s\n",
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| 377 | &buf[n]);
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| 378 | if (unlink(buf) < 0 && errno != ENOENT) {
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| 379 | BIO_printf(bio_err,
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| 380 | "%s: Can't unlink %s, %s\n",
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| 381 | opt_getprog(), buf, strerror(errno));
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| 382 | errs++;
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| 383 | }
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| 384 | }
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| 385 | OPENSSL_free(ep->filename);
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| 386 | OPENSSL_free(ep);
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| 387 | }
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| 388 | OPENSSL_free(bp);
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| 389 | }
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| 390 | hash_table[i] = NULL;
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| 391 | }
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| 392 |
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| 393 | OPENSSL_free(buf);
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| 394 | return errs;
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| 395 | }
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| 396 |
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| 397 | typedef enum OPTION_choice {
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| 398 | OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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| 399 | OPT_COMPAT, OPT_OLD, OPT_N, OPT_VERBOSE
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| 400 | } OPTION_CHOICE;
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| 401 |
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| 402 | OPTIONS rehash_options[] = {
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| 403 | {OPT_HELP_STR, 1, '-', "Usage: %s [options] [cert-directory...]\n"},
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| 404 | {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
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| 405 | {"help", OPT_HELP, '-', "Display this summary"},
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| 406 | {"h", OPT_HELP, '-', "Display this summary"},
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| 407 | {"compat", OPT_COMPAT, '-', "Create both new- and old-style hash links"},
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| 408 | {"old", OPT_OLD, '-', "Use old-style hash to generate links"},
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| 409 | {"n", OPT_N, '-', "Do not remove existing links"},
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| 410 | {"v", OPT_VERBOSE, '-', "Verbose output"},
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| 411 | {NULL}
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| 412 | };
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| 413 |
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| 414 |
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| 415 | int rehash_main(int argc, char **argv)
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| 416 | {
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| 417 | const char *env, *prog;
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| 418 | char *e, *m;
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| 419 | int errs = 0;
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| 420 | OPTION_CHOICE o;
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| 421 | enum Hash h = HASH_NEW;
|
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| 422 |
|
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| 423 | prog = opt_init(argc, argv, rehash_options);
|
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| 424 | while ((o = opt_next()) != OPT_EOF) {
|
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| 425 | switch (o) {
|
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| 426 | case OPT_EOF:
|
---|
| 427 | case OPT_ERR:
|
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| 428 | BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
|
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| 429 | goto end;
|
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| 430 | case OPT_HELP:
|
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| 431 | opt_help(rehash_options);
|
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| 432 | goto end;
|
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| 433 | case OPT_COMPAT:
|
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| 434 | h = HASH_BOTH;
|
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| 435 | break;
|
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| 436 | case OPT_OLD:
|
---|
| 437 | h = HASH_OLD;
|
---|
| 438 | break;
|
---|
| 439 | case OPT_N:
|
---|
| 440 | remove_links = 0;
|
---|
| 441 | break;
|
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| 442 | case OPT_VERBOSE:
|
---|
| 443 | verbose = 1;
|
---|
| 444 | break;
|
---|
| 445 | }
|
---|
| 446 | }
|
---|
| 447 | argc = opt_num_rest();
|
---|
| 448 | argv = opt_rest();
|
---|
| 449 |
|
---|
| 450 | evpmd = EVP_sha1();
|
---|
| 451 | evpmdsize = EVP_MD_size(evpmd);
|
---|
| 452 |
|
---|
| 453 | if (*argv) {
|
---|
| 454 | while (*argv)
|
---|
| 455 | errs += do_dir(*argv++, h);
|
---|
| 456 | } else if ((env = getenv("SSL_CERT_DIR")) != NULL) {
|
---|
| 457 | m = OPENSSL_strdup(env);
|
---|
| 458 | for (e = strtok(m, ":"); e != NULL; e = strtok(NULL, ":"))
|
---|
| 459 | errs += do_dir(e, h);
|
---|
| 460 | OPENSSL_free(m);
|
---|
| 461 | } else {
|
---|
| 462 | errs += do_dir("/etc/ssl/certs", h);
|
---|
| 463 | }
|
---|
| 464 |
|
---|
| 465 | end:
|
---|
| 466 | return errs;
|
---|
| 467 | }
|
---|
| 468 |
|
---|
| 469 | #else
|
---|
| 470 | OPTIONS rehash_options[] = {
|
---|
| 471 | {NULL}
|
---|
| 472 | };
|
---|
| 473 |
|
---|
| 474 | int rehash_main(int argc, char **argv)
|
---|
| 475 | {
|
---|
| 476 | BIO_printf(bio_err, "Not available; use c_rehash script\n");
|
---|
| 477 | return (1);
|
---|
| 478 | }
|
---|
| 479 |
|
---|
| 480 | #endif /* defined(OPENSSL_SYS_UNIX) || defined(__APPLE__) */
|
---|