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/*
Unix SMB/CIFS implementation.
ads tls wrapping code
Copyright (C) Stefan Metzmacher 2024
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "ads.h"
#include "lib/param/param.h"
#include "../source4/lib/tls/tls.h"
void ndr_print_ads_tlswrap_struct(struct ndr_print *ndr, const char *name, const struct ads_tlswrap *r)
{
ndr_print_struct(ndr, name, "tlswrap");
ndr->depth++;
ndr_print_ptr(ndr, "mem_ctx", r->mem_ctx);
ndr_print_timeval(ndr, "endtime", &r->endtime);
#ifdef HAVE_ADS
ndr_print_ptr(ndr, "sbiod", r->sbiod);
ndr_print_ptr(ndr, "tls_params", r->tls_params);
ndr_print_ptr(ndr, "tls_sync", r->tls_sync);
#endif /* HAVE_ADS */
ndr->depth--;
}
#ifdef HAVE_ADS
static int ads_tlswrap_setup(Sockbuf_IO_Desc *sbiod, void *arg)
{
struct ads_tlswrap *wrap = (struct ads_tlswrap *)arg;
wrap->sbiod = sbiod;
sbiod->sbiod_pvt = wrap;
return 0;
}
static int ads_tlswrap_remove(Sockbuf_IO_Desc *sbiod)
{
struct ads_tlswrap *wrap =
(struct ads_tlswrap *)sbiod->sbiod_pvt;
wrap->sbiod = NULL;
return 0;
}
static ssize_t ads_tlswrap_send_function(gnutls_transport_ptr_t ptr,
const uint8_t *buf, size_t size)
{
struct ads_tlswrap *wrap = (struct ads_tlswrap *)ptr;
if (wrap->endtime.tv_sec != 0) {
if (timeval_expired(&wrap->endtime)) {
errno = ECONNRESET;
return -1;
}
}
return LBER_SBIOD_WRITE_NEXT(wrap->sbiod, discard_const(buf), size);
}
static ssize_t ads_tlswrap_recv_function(gnutls_transport_ptr_t ptr,
uint8_t *buf, size_t size)
{
struct ads_tlswrap *wrap = (struct ads_tlswrap *)ptr;
if (wrap->endtime.tv_sec != 0) {
if (timeval_expired(&wrap->endtime)) {
errno = ECONNRESET;
return -1;
}
}
return LBER_SBIOD_READ_NEXT(wrap->sbiod, buf, size);
}
static ber_slen_t ads_tlswrap_read(Sockbuf_IO_Desc *sbiod,
void *buf, ber_len_t len)
{
struct ads_tlswrap *wrap =
(struct ads_tlswrap *)sbiod->sbiod_pvt;
return tstream_tls_sync_read(wrap->tls_sync, buf, len);
}
static ber_slen_t ads_tlswrap_write(Sockbuf_IO_Desc *sbiod,
void *buf, ber_len_t len)
{
struct ads_tlswrap *wrap =
(struct ads_tlswrap *)sbiod->sbiod_pvt;
return tstream_tls_sync_write(wrap->tls_sync, buf, len);
}
static int ads_tlswrap_ctrl(Sockbuf_IO_Desc *sbiod, int opt, void *arg)
{
struct ads_tlswrap *wrap =
(struct ads_tlswrap *)sbiod->sbiod_pvt;
int ret;
switch (opt) {
case LBER_SB_OPT_DATA_READY:
if (tstream_tls_sync_pending(wrap->tls_sync) > 0) {
return 1;
}
ret = LBER_SBIOD_CTRL_NEXT(sbiod, opt, arg);
break;
default:
ret = LBER_SBIOD_CTRL_NEXT(sbiod, opt, arg);
break;
}
return ret;
}
static int ads_tlswrap_close(Sockbuf_IO_Desc *sbiod)
{
struct ads_tlswrap *wrap =
(struct ads_tlswrap *)sbiod->sbiod_pvt;
TALLOC_FREE(wrap->tls_sync);
TALLOC_FREE(wrap->tls_params);
return 0;
}
static const Sockbuf_IO ads_tlswrap_sockbuf_io = {
ads_tlswrap_setup, /* sbi_setup */
ads_tlswrap_remove, /* sbi_remove */
ads_tlswrap_ctrl, /* sbi_ctrl */
ads_tlswrap_read, /* sbi_read */
ads_tlswrap_write, /* sbi_write */
ads_tlswrap_close /* sbi_close */
};
ADS_STATUS ads_setup_tls_wrapping(struct ads_tlswrap *wrap,
LDAP *ld,
const char *server_name)
{
TALLOC_CTX *frame = talloc_stackframe();
Sockbuf_IO *io = discard_const_p(Sockbuf_IO, &ads_tlswrap_sockbuf_io);
Sockbuf *sb = NULL;
struct loadparm_context *lp_ctx = NULL;
ADS_STATUS status;
NTSTATUS ntstatus;
unsigned to;
int rc;
rc = ldap_get_option(ld, LDAP_OPT_SOCKBUF, &sb);
status = ADS_ERROR_LDAP(rc);
if (!ADS_ERR_OK(status)) {
TALLOC_FREE(frame);
return status;
}
lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
if (lp_ctx == NULL) {
TALLOC_FREE(frame);
return ADS_ERROR(LDAP_NO_MEMORY);
}
ntstatus = tstream_tls_params_client_lpcfg(wrap->mem_ctx,
lp_ctx,
server_name,
&wrap->tls_params);
if (!NT_STATUS_IS_OK(ntstatus)) {
TALLOC_FREE(frame);
return ADS_ERROR_NT(ntstatus);
}
/* setup the real wrapping callbacks */
rc = ber_sockbuf_add_io(sb, io, LBER_SBIOD_LEVEL_TRANSPORT, wrap);
status = ADS_ERROR_LDAP(rc);
if (!ADS_ERR_OK(status)) {
TALLOC_FREE(frame);
return status;
}
to = lpcfg_ldap_connection_timeout(lp_ctx);
wrap->endtime = timeval_current_ofs(to, 0);
ntstatus = tstream_tls_sync_setup(wrap->tls_params,
wrap,
ads_tlswrap_send_function,
ads_tlswrap_recv_function,
wrap->mem_ctx,
&wrap->tls_sync);
wrap->endtime = timeval_zero();
if (!NT_STATUS_IS_OK(ntstatus)) {
ber_sockbuf_remove_io(sb, io, LBER_SBIOD_LEVEL_TRANSPORT);
TALLOC_FREE(frame);
return ADS_ERROR_NT(ntstatus);
}
TALLOC_FREE(frame);
return ADS_SUCCESS;
}
const DATA_BLOB *ads_tls_channel_bindings(struct ads_tlswrap *wrap)
{
if (wrap->tls_sync == NULL) {
return NULL;
}
return tstream_tls_sync_channel_bindings(wrap->tls_sync);
}
#else
ADS_STATUS ads_setup_tls_wrapping(struct ads_tlswrap *wrap,
LDAP *ld,
const char *server_name)
{
return ADS_ERROR_NT(NT_STATUS_NOT_SUPPORTED);
}
const DATA_BLOB *ads_tls_channel_bindings(struct ads_tlswrap *wrap)
{
return NULL;
}
#endif /* HAVE_ADS */
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