1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/* c_rehash.c - C implementation based on the Perl and shell versions
*
* Copyright (c) 2013 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This software is licensed under the MIT License.
* Full license available at: http://opensource.org/licenses/MIT
*/
#define _POSIX_C_SOURCE 200809L
#define _GNU_SOURCE
#include <ctype.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <fnmatch.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/x509.h>
#define countof(x) (sizeof(x) / sizeof(x[0]))
struct hash_info {
struct hash_info *next;
int type;
unsigned long hash;
unsigned char digest[EVP_MAX_MD_SIZE];
};
enum Type {
TYPE_CERT = 0,
TYPE_CRL,
MAX_TYPES,
};
static const EVP_MD *evpmd;
static int evpmdsize;
static const char *prefixes[MAX_TYPES] = { "", "r" };
static struct hash_info *hash_table[257];
static int get_link_id(int type, unsigned long hash, unsigned char *digest)
{
unsigned int bucket = hash % countof(hash_table);
struct hash_info *hi;
int count = 0;
for (hi = hash_table[bucket]; hi; hi = hi->next) {
if (hi->type != type || hi->hash != hash)
continue;
if (memcmp(digest, hi->digest, evpmdsize) == 0)
return -1;
count++;
}
hi = malloc(sizeof(*hi));
hi->next = hash_table[bucket];
hi->type = type;
hi->hash = hash;
memcpy(hi->digest, digest, evpmdsize);
hash_table[bucket] = hi;
return count;
}
static int link_file(int dirfd, const char *filename, int type, unsigned long hash, unsigned char *digest)
{
char linkfn[32];
int id;
id = get_link_id(type, hash, digest);
if (id < 0) {
fprintf(stderr, "WARNING: Skipping duplicate certificate in file %s\n",
filename);
return -1;
}
snprintf(linkfn, sizeof(linkfn),
"%08lx.%s%d", hash, prefixes[type], id);
fprintf(stdout, "%s => %s\n", linkfn, filename);
if (symlinkat(filename, dirfd, linkfn) < 0)
perror(linkfn);
return 0;
}
static BIO *BIO_openat(int dirfd, const char *filename)
{
FILE *fp;
BIO *bio;
int fd;
fd = openat(dirfd, filename, O_RDONLY);
if (fd < 0) {
perror(filename);
return NULL;
}
fp = fdopen(fd, "r");
if (fp == NULL) {
close(fd);
return NULL;
}
bio = BIO_new_fp(fp, BIO_CLOSE);
if (!bio) {
fclose(fp);
return NULL;
}
return bio;
}
static int hash_file(int dirfd, const char *filename)
{
STACK_OF(X509_INFO) *inf;
X509_INFO *x;
BIO *b;
int i, count = 0;
unsigned char digest[EVP_MAX_MD_SIZE];
b = BIO_openat(dirfd, filename);
if (!b)
return -1;
inf = PEM_X509_INFO_read_bio(b, NULL, NULL, NULL);
BIO_free(b);
if (!inf)
return -1;
for(i = 0; i < sk_X509_INFO_num(inf); i++) {
x = sk_X509_INFO_value(inf, i);
if (x->x509) {
X509_digest(x->x509, evpmd, digest, NULL);
link_file(dirfd, filename, TYPE_CERT,
X509_subject_name_hash(x->x509), digest);
count++;
}
if (x->crl) {
X509_CRL_digest(x->crl, evpmd, digest, NULL);
link_file(dirfd, filename, TYPE_CRL,
X509_NAME_hash(X509_CRL_get_issuer(x->crl)),
digest);
count++;
}
}
sk_X509_INFO_pop_free(inf, X509_INFO_free);
if (count == 0) {
fprintf(stderr,
"WARNING: %s does not contain a certificate or CRL: skipping\n",
filename);
}
return count;
}
static int is_hash_filename(const char *fn)
{
int i;
for (i = 0; i < 8; i++)
if (!isxdigit(fn[i]))
return 0;
if (fn[i++] != '.')
return 0;
if (fn[i] == 'r') i++;
for (; fn[i] != 0; i++)
if (!isdigit(fn[i]))
return 0;
return 1;
}
static int hash_dir(const char *dirname)
{
struct dirent *de;
struct stat st;
int dirfd;
DIR *d;
fprintf(stdout, "Doing %s\n", dirname);
dirfd = open(dirname, O_RDONLY | O_DIRECTORY);
if (dirfd < 0) {
perror(dirname);
return -1;
}
d = opendir(dirname);
if (!d) {
close(dirfd);
return -1;
}
while ((de = readdir(d)) != NULL) {
if (fstatat(dirfd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
continue;
if (!S_ISLNK(st.st_mode))
continue;
if (!is_hash_filename(de->d_name))
continue;
if (unlinkat(dirfd, de->d_name, 0) < 0)
perror(de->d_name);
}
rewinddir(d);
while ((de = readdir(d)) != NULL) {
if (fnmatch("*.pem", de->d_name, FNM_NOESCAPE) == 0)
hash_file(dirfd, de->d_name);
}
closedir(d);
return 0;
}
int main(int argc, char **argv)
{
const char *env;
int i;
evpmd = EVP_sha1();
evpmdsize = EVP_MD_size(evpmd);
if (argc > 1) {
for (i = 1; i < argc; i++)
hash_dir(argv[i]);
} else if ((env = getenv("SSL_CERT_DIR")) != NULL) {
char *e, *m;
m = strdup(env);
for (e = strtok(m, ":"); e != NULL; e = strtok(NULL, ":"))
hash_dir(e);
free(m);
} else {
hash_dir("/etc/ssl/certs");
}
return 0;
}
|
