Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/tls/tls_drv.c

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/*
* ejabberd, Copyright (C) 2002-2010 ProcessOne
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*
*/
#include <stdio.h>
#include <string.h>
#include <erl_driver.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>
#define BUF_SIZE 1024
typedef struct {
ErlDrvPort port;
BIO *bio_read;
BIO *bio_write;
SSL *ssl;
} tls_data;
#ifdef _WIN32
typedef unsigned __int32 uint32_t;
#endif
#ifndef SSL_OP_NO_TICKET
#define SSL_OP_NO_TICKET 0
#endif
/*
* str_hash is based on the public domain code from
* http://www.burtleburtle.net/bob/hash/doobs.html
*/
static uint32_t str_hash(char *s)
{
unsigned char *key = (unsigned char *)s;
uint32_t hash = 0;
size_t i;
for (i = 0; key[i] != 0; i++) {
hash += key[i];
hash += (hash << 10);
hash ^= (hash >> 6);
}
hash += (hash << 3);
hash ^= (hash >> 11);
hash += (hash << 15);
return hash;
}
/* Linear hashing */
#define MIN_LEVEL 8
#define MAX_LEVEL 20
struct bucket {
uint32_t hash;
char *key_file;
time_t mtime;
SSL_CTX *ssl_ctx;
struct bucket *next;
};
struct hash_table {
int split;
int level;
struct bucket **buckets;
int size;
};
struct hash_table ht;
static void init_hash_table()
{
size_t size = 1 << (MIN_LEVEL + 1);
size_t i;
ht.buckets = (struct bucket **)driver_alloc(sizeof(struct bucket *) * size);
ht.split = 0;
ht.level = MIN_LEVEL;
for (i = 0; i < size; i++)
ht.buckets[i] = NULL;
}
static void hash_table_insert(char *key_file, time_t mtime,
SSL_CTX *ssl_ctx)
{
int level, split;
uint32_t hash = str_hash(key_file);
size_t bucket;
int do_split = 0;
struct bucket *el;
struct bucket *new_bucket_el;
split = ht.split;
level = ht.level;
bucket = hash & ((1 << level) - 1);
if (bucket < split)
bucket = hash & ((1 << (level + 1)) - 1);
el = ht.buckets[bucket];
while (el != NULL) {
if (el->hash == hash && strcmp(el->key_file, key_file) == 0) {
el->mtime = mtime;
if (el->ssl_ctx != NULL)
SSL_CTX_free(el->ssl_ctx);
el->ssl_ctx = ssl_ctx;
break;
}
el = el->next;
}
if (el == NULL) {
if (ht.buckets[bucket] != NULL)
do_split = !0;
new_bucket_el = (struct bucket *)driver_alloc(sizeof(struct bucket));
new_bucket_el->hash = hash;
new_bucket_el->key_file = (char *)driver_alloc(strlen(key_file) + 1);
strcpy(new_bucket_el->key_file, key_file);
new_bucket_el->mtime = mtime;
new_bucket_el->ssl_ctx = ssl_ctx;
new_bucket_el->next = ht.buckets[bucket];
ht.buckets[bucket] = new_bucket_el;
}
if (do_split) {
struct bucket **el_ptr = &ht.buckets[split];
size_t new_bucket = split + (1 << level);
while (*el_ptr != NULL) {
uint32_t hash = (*el_ptr)->hash;
if ((hash & ((1 << (level + 1)) - 1)) == new_bucket) {
struct bucket *moved_el = *el_ptr;
*el_ptr = (*el_ptr)->next;
moved_el->next = ht.buckets[new_bucket];
ht.buckets[new_bucket] = moved_el;
} else
el_ptr = &(*el_ptr)->next;
}
split++;
if (split == 1 << level) {
size_t size;
size_t i;
split = 0;
level++;
size = 1 << (level + 1);
ht.split = split;
ht.level = level;
ht.buckets = (struct bucket **)
driver_realloc(ht.buckets, sizeof(struct bucket *) * size);
for (i = 1 << level; i < size; i++)
ht.buckets[i] = NULL;
} else
ht.split = split;
}
}
static SSL_CTX *hash_table_lookup(char *key_file, time_t *pmtime)
{
int level, split;
uint32_t hash = str_hash(key_file);
size_t bucket;
struct bucket *el;
split = ht.split;
level = ht.level;
bucket = hash & ((1 << level) - 1);
if (bucket < split)
bucket = hash & ((1 << (level + 1)) - 1);
el = ht.buckets[bucket];
while (el != NULL) {
if (el->hash == hash && strcmp(el->key_file, key_file) == 0) {
*pmtime = el->mtime;
return el->ssl_ctx;
}
el = el->next;
}
return NULL;
}
static ErlDrvData tls_drv_start(ErlDrvPort port, char *buff)
{
tls_data *d = (tls_data *)driver_alloc(sizeof(tls_data));
d->port = port;
d->bio_read = NULL;
d->bio_write = NULL;
d->ssl = NULL;
set_port_control_flags(port, PORT_CONTROL_FLAG_BINARY);
return (ErlDrvData)d;
}
static void tls_drv_stop(ErlDrvData handle)
{
tls_data *d = (tls_data *)handle;
if (d->ssl != NULL)
SSL_free(d->ssl);
driver_free((char *)handle);
}
static void tls_drv_finish()
{
int level;
struct bucket *el;
int i;
level = ht.level;
for (i = 0; i < 1 << (level + 1); i++) {
el = ht.buckets[i];
while (el != NULL) {
if (el->ssl_ctx != NULL)
SSL_CTX_free(el->ssl_ctx);
driver_free(el->key_file);
el = el->next;
}
}
driver_free(ht.buckets);
}
static int is_key_file_modified(char *file, time_t *key_file_mtime)
{
struct stat file_stat;
if (stat(file, &file_stat))
{
*key_file_mtime = 0;
return 1;
} else {
if (*key_file_mtime != file_stat.st_mtime)
{
*key_file_mtime = file_stat.st_mtime;
return 1;
} else
return 0;
}
}
static int verify_callback(int preverify_ok, X509_STORE_CTX *ctx)
{
return 1;
}
#define SET_CERTIFICATE_FILE_ACCEPT 1
#define SET_CERTIFICATE_FILE_CONNECT 2
#define SET_ENCRYPTED_INPUT 3
#define SET_DECRYPTED_OUTPUT 4
#define GET_ENCRYPTED_OUTPUT 5
#define GET_DECRYPTED_INPUT 6
#define GET_PEER_CERTIFICATE 7
#define GET_VERIFY_RESULT 8
#define VERIFY_NONE 0x10000
#define die_unless(cond, errstr) \
if (!(cond)) \
{ \
int errstrlen = strlen(errstr); \
unsigned long error_code = ERR_get_error(); \
char *error_string = error_code ? \
ERR_error_string(error_code, NULL) : \
NULL; \
int error_string_length = error_string ? \
strlen(error_string) : 0; \
if (error_code) \
rlen = errstrlen + error_string_length + 3; \
else \
rlen = errstrlen + 1; \
b = driver_alloc_binary(rlen); \
b->orig_bytes[0] = 1; \
strncpy(b->orig_bytes + 1, errstr, errstrlen); \
if (error_code) { \
strncpy(b->orig_bytes + 1 + errstrlen, \
": ", 2); \
strncpy(b->orig_bytes + 3 + errstrlen, \
error_string, error_string_length); \
} \
*rbuf = (char *)b; \
return rlen; \
}
static int tls_drv_control(ErlDrvData handle,
unsigned int command,
char *buf, int len,
char **rbuf, int rlen)
{
tls_data *d = (tls_data *)handle;
int res;
int size;
ErlDrvBinary *b;
X509 *cert;
unsigned int flags = command;
command &= 0xffff;
ERR_clear_error();
switch (command)
{
case SET_CERTIFICATE_FILE_ACCEPT:
case SET_CERTIFICATE_FILE_CONNECT: {
time_t mtime = 0;
SSL_CTX *ssl_ctx = hash_table_lookup(buf, &mtime);
if (is_key_file_modified(buf, &mtime) || ssl_ctx == NULL)
{
SSL_CTX *ctx;
hash_table_insert(buf, mtime, NULL);
ctx = SSL_CTX_new(SSLv23_method());
die_unless(ctx, "SSL_CTX_new failed");
res = SSL_CTX_use_certificate_chain_file(ctx, buf);
die_unless(res > 0, "SSL_CTX_use_certificate_file failed");
res = SSL_CTX_use_PrivateKey_file(ctx, buf, SSL_FILETYPE_PEM);
die_unless(res > 0, "SSL_CTX_use_PrivateKey_file failed");
res = SSL_CTX_check_private_key(ctx);
die_unless(res > 0, "SSL_CTX_check_private_key failed");
SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
SSL_CTX_set_default_verify_paths(ctx);
if (command == SET_CERTIFICATE_FILE_ACCEPT)
{
SSL_CTX_set_verify(ctx,
SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,
verify_callback);
}
ssl_ctx = ctx;
hash_table_insert(buf, mtime, ssl_ctx);
}
d->ssl = SSL_new(ssl_ctx);
die_unless(d->ssl, "SSL_new failed");
if (flags & VERIFY_NONE)
SSL_set_verify(d->ssl, SSL_VERIFY_NONE, verify_callback);
d->bio_read = BIO_new(BIO_s_mem());
d->bio_write = BIO_new(BIO_s_mem());
SSL_set_bio(d->ssl, d->bio_read, d->bio_write);
if (command == SET_CERTIFICATE_FILE_ACCEPT) {
SSL_set_options(d->ssl, SSL_OP_NO_TICKET);
SSL_set_accept_state(d->ssl);
} else {
SSL_set_options(d->ssl, SSL_OP_NO_SSLv2|SSL_OP_NO_TICKET);
SSL_set_connect_state(d->ssl);
}
break;
}
case SET_ENCRYPTED_INPUT:
die_unless(d->ssl, "SSL not initialized");
BIO_write(d->bio_read, buf, len);
break;
case SET_DECRYPTED_OUTPUT:
die_unless(d->ssl, "SSL not initialized");
res = SSL_write(d->ssl, buf, len);
if (res <= 0)
{
res = SSL_get_error(d->ssl, res);
if (res == SSL_ERROR_WANT_READ || res == SSL_ERROR_WANT_WRITE)
{
b = driver_alloc_binary(1);
b->orig_bytes[0] = 2;
*rbuf = (char *)b;
return 1;
} else {
die_unless(0, "SSL_write failed");
}
}
break;
case GET_ENCRYPTED_OUTPUT:
die_unless(d->ssl, "SSL not initialized");
size = BUF_SIZE + 1;
rlen = 1;
b = driver_alloc_binary(size);
b->orig_bytes[0] = 0;
while ((res = BIO_read(d->bio_write,
b->orig_bytes + rlen, BUF_SIZE)) > 0)
{
//printf("%d bytes of encrypted data read from state machine\r\n", res);
rlen += res;
size += BUF_SIZE;
b = driver_realloc_binary(b, size);
}
b = driver_realloc_binary(b, rlen);
*rbuf = (char *)b;
return rlen;
case GET_DECRYPTED_INPUT:
if (!SSL_is_init_finished(d->ssl))
{
res = SSL_do_handshake(d->ssl);
if (res <= 0)
die_unless(SSL_get_error(d->ssl, res) == SSL_ERROR_WANT_READ,
"SSL_do_handshake failed");
} else {
size = BUF_SIZE + 1;
rlen = 1;
b = driver_alloc_binary(size);
b->orig_bytes[0] = 0;
while ((res = SSL_read(d->ssl,
b->orig_bytes + rlen, BUF_SIZE)) > 0)
{
//printf("%d bytes of decrypted data read from state machine\r\n",res);
rlen += res;
size += BUF_SIZE;
b = driver_realloc_binary(b, size);
}
if (res < 0)
{
int err = SSL_get_error(d->ssl, res);
if (err == SSL_ERROR_WANT_READ)
{
//printf("SSL_read wants more data\r\n");
//return 0;
}
// TODO
}
b = driver_realloc_binary(b, rlen);
*rbuf = (char *)b;
return rlen;
}
break;
case GET_PEER_CERTIFICATE:
cert = SSL_get_peer_certificate(d->ssl);
if (cert == NULL)
{
b = driver_alloc_binary(1);
b->orig_bytes[0] = 1;
*rbuf = (char *)b;
return 1;
} else {
unsigned char *tmp_buf;
rlen = i2d_X509(cert, NULL);
if (rlen >= 0)
{
rlen++;
b = driver_alloc_binary(rlen);
b->orig_bytes[0] = 0;
tmp_buf = (unsigned char *)&b->orig_bytes[1];
i2d_X509(cert, &tmp_buf);
X509_free(cert);
*rbuf = (char *)b;
return rlen;
} else
X509_free(cert);
}
break;
case GET_VERIFY_RESULT:
b = driver_alloc_binary(1);
b->orig_bytes[0] = SSL_get_verify_result(d->ssl);
*rbuf = (char *)b;
return 1;
break;
}
b = driver_alloc_binary(1);
b->orig_bytes[0] = 0;
*rbuf = (char *)b;
return 1;
}
ErlDrvEntry tls_driver_entry = {
NULL, /* F_PTR init, N/A */
tls_drv_start, /* L_PTR start, called when port is opened */
tls_drv_stop, /* F_PTR stop, called when port is closed */
NULL, /* F_PTR output, called when erlang has sent */
NULL, /* F_PTR ready_input, called when input descriptor ready */
NULL, /* F_PTR ready_output, called when output descriptor ready */
"tls_drv", /* char *driver_name, the argument to open_port */
tls_drv_finish, /* F_PTR finish, called when unloaded */
NULL, /* handle */
tls_drv_control, /* F_PTR control, port_command callback */
NULL, /* F_PTR timeout, reserved */
NULL /* F_PTR outputv, reserved */
};
DRIVER_INIT(tls_drv) /* must match name in driver_entry */
{
OpenSSL_add_ssl_algorithms();
SSL_load_error_strings();
init_hash_table();
return &tls_driver_entry;
}
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