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:
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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:
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437 | h = HASH_OLD;
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438 | break;
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439 | case OPT_N:
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440 | remove_links = 0;
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441 | break;
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442 | case OPT_VERBOSE:
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443 | verbose = 1;
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444 | break;
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445 | }
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446 | }
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447 | argc = opt_num_rest();
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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__) */
|
---|