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/* 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 <sys/stat.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;
}
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