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/* $Id$ */
#include <stdio.h>
#include <string.h>
#include <erl_driver.h>
#include <openssl/ssl.h>
#define BUF_SIZE 1024
typedef struct {
ErlDrvPort port;
SSL_CTX *ctx;
BIO *bio_read;
BIO *bio_write;
SSL *ssl;
} tls_data;
static ErlDrvData tls_drv_start(ErlDrvPort port, char *buff)
{
tls_data *d = (tls_data *)driver_alloc(sizeof(tls_data));
d->port = port;
d->ctx = NULL;
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);
if (d->ctx != NULL)
SSL_CTX_free(d->ctx);
driver_free((char *)handle);
}
#define SET_CERTIFICATE_FILE 1
#define SET_ENCRYPTED_INPUT 2
#define SET_DECRYPTED_OUTPUT 3
#define GET_ENCRYPTED_OUTPUT 4
#define GET_DECRYPTED_INPUT 5
#define die_unless(cond, errstr) \
if (!(cond)) \
{ \
rlen = strlen(errstr) + 1; \
b = driver_alloc_binary(rlen); \
b->orig_bytes[0] = 1; \
strncpy(b->orig_bytes + 1, errstr, rlen - 1); \
*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;
switch (command)
{
case SET_CERTIFICATE_FILE:
d->ctx = SSL_CTX_new(SSLv23_server_method());
die_unless(d->ctx, "SSL_CTX_new failed");
res = SSL_CTX_use_certificate_file(d->ctx, buf, SSL_FILETYPE_PEM);
die_unless(res > 0, "SSL_CTX_use_certificate_file failed");
res = SSL_CTX_use_PrivateKey_file(d->ctx, buf, SSL_FILETYPE_PEM);
die_unless(res > 0, "SSL_CTX_use_PrivateKey_file failed");
res = SSL_CTX_check_private_key(d->ctx);
die_unless(res > 0, "SSL_CTX_check_private_key failed");
d->ssl = SSL_new(d->ctx);
die_unless(d->ssl, "SSL_new failed");
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);
SSL_set_accept_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);
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))
{
//printf("Doing SSL_accept\r\n");
res = SSL_accept(d->ssl);
//if (res == 0)
// printf("SSL_accept returned zero\r\n");
if (res < 0)
die_unless(SSL_get_error(d->ssl, res) == SSL_ERROR_WANT_READ,
"SSL_accept 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;
}
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 */
NULL, /* 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();
return &tls_driver_entry;
}
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