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/*
Unix SMB/CIFS implementation.
a composite API for finding a DC and its name via CLDAP
Copyright (C) Andrew Tridgell 2010
Copyright (C) Andrew Bartlett 2010
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 "include/includes.h"
#include <tevent.h>
#include "libcli/resolve/resolve.h"
#include "lib/messaging/messaging.h"
#include "libcli/libcli.h"
#include "libcli/cldap/cldap.h"
#include "libcli/finddcs.h"
#include "libcli/security/dom_sid.h"
#include "lib/util/tevent_ntstatus.h"
#include "libcli/composite/composite.h"
struct finddcs_cldap_state {
struct tevent_context *ev;
struct tevent_req *req;
const char *dns_domain_name;
struct dom_sid *domain_sid;
const char **srv_addresses;
uint32_t minimum_dc_flags;
uint32_t srv_address_index;
struct cldap_socket *cldap;
struct cldap_netlogon *netlogon;
};
static void finddcs_cldap_srv_resolved(struct composite_context *ctx);
static void finddcs_cldap_netlogon_replied(struct tevent_req *req);
/*
* find a list of DCs via DNS/CLDAP
*
*/
struct tevent_req *finddcs_cldap_send(TALLOC_CTX *mem_ctx,
struct finddcs *io,
struct resolve_context *resolve_ctx,
struct tevent_context *event_ctx)
{
struct finddcs_cldap_state *state;
struct tevent_req *req;
const char *srv_name;
struct composite_context *creq;
struct nbt_name name;
req = tevent_req_create(mem_ctx, &state, struct finddcs_cldap_state);
if (req == NULL) {
return NULL;
}
state->req = req;
state->ev = event_ctx;
state->minimum_dc_flags = io->in.minimum_dc_flags;
state->dns_domain_name = talloc_strdup(state, io->in.dns_domain_name);
if (tevent_req_nomem(state->dns_domain_name, req)) {
return tevent_req_post(req, event_ctx);
}
if (io->in.domain_sid) {
state->domain_sid = dom_sid_dup(state, io->in.domain_sid);
if (tevent_req_nomem(state->domain_sid, req)) {
return tevent_req_post(req, event_ctx);
}
} else {
state->domain_sid = NULL;
}
/* step1: lookup _ldap._tcp.* */
if (io->in.site_name) {
srv_name = talloc_asprintf(state, "_ldap._tcp.%s._sites.%s",
io->in.site_name, io->in.dns_domain_name);
} else {
srv_name = talloc_asprintf(state, "_ldap._tcp.%s", io->in.dns_domain_name);
}
make_nbt_name(&name, srv_name, 0);
creq = resolve_name_ex_send(resolve_ctx, state,
RESOLVE_NAME_FLAG_FORCE_DNS | RESOLVE_NAME_FLAG_DNS_SRV,
0, &name, event_ctx);
if (tevent_req_nomem(creq, req)) {
return tevent_req_post(req, event_ctx);
}
creq->async.fn = finddcs_cldap_srv_resolved;
creq->async.private_data = state;
return req;
}
/*
fire off a CLDAP query to the next server
*/
static void finddcs_cldap_next_server(struct finddcs_cldap_state *state)
{
struct tevent_req *subreq;
if (state->srv_addresses[state->srv_address_index] == NULL) {
tevent_req_nterror(state->req, NT_STATUS_OBJECT_NAME_NOT_FOUND);
return;
}
state->netlogon = talloc_zero(state, struct cldap_netlogon);
if (tevent_req_nomem(state->netlogon, state->req)) {
return;
}
state->netlogon->in.dest_address = state->srv_addresses[state->srv_address_index];
/* we should get the port from the SRV response */
state->netlogon->in.dest_port = 389;
state->netlogon->in.realm = state->dns_domain_name;
if (state->domain_sid) {
state->netlogon->in.domain_sid = dom_sid_string(state, state->domain_sid);
if (tevent_req_nomem(state->netlogon->in.domain_sid, state->req)) {
return;
}
}
state->netlogon->in.acct_control = -1;
state->netlogon->in.version =
NETLOGON_NT_VERSION_5 |
NETLOGON_NT_VERSION_5EX |
NETLOGON_NT_VERSION_IP;
state->netlogon->in.map_response = true;
subreq = cldap_netlogon_send(state, state->cldap, state->netlogon);
if (tevent_req_nomem(subreq, state->req)) {
return;
}
tevent_req_set_callback(subreq, finddcs_cldap_netlogon_replied, state);
}
/*
we have a response from a CLDAP server for a netlogon request
*/
static void finddcs_cldap_netlogon_replied(struct tevent_req *subreq)
{
struct finddcs_cldap_state *state;
NTSTATUS status;
state = tevent_req_callback_data(subreq, struct finddcs_cldap_state);
status = cldap_netlogon_recv(subreq, state->netlogon, state->netlogon);
if (!NT_STATUS_IS_OK(status)) {
state->srv_address_index++;
finddcs_cldap_next_server(state);
return;
}
if (state->minimum_dc_flags !=
(state->minimum_dc_flags & state->netlogon->out.netlogon.data.nt5_ex.server_type)) {
/* the server didn't match the minimum requirements */
DEBUG(4,(__location__ ": Skipping DC %s with server_type=0x%08x\n",
state->srv_addresses[state->srv_address_index],
state->netlogon->out.netlogon.data.nt5_ex.server_type));
state->srv_address_index++;
finddcs_cldap_next_server(state);
return;
}
talloc_free(subreq);
tevent_req_done(state->req);
}
/*
* Having got a DNS SRV answer, fire off the first CLDAP request
*/
static void finddcs_cldap_srv_resolved(struct composite_context *ctx)
{
struct finddcs_cldap_state *state =
talloc_get_type(ctx->async.private_data, struct finddcs_cldap_state);
NTSTATUS status;
status = resolve_name_multiple_recv(ctx, state, &state->srv_addresses);
if (tevent_req_nterror(state->req, status)) {
return;
}
state->srv_address_index = 0;
status = cldap_socket_init(state, state->ev, NULL, NULL, &state->cldap);
if (tevent_req_nterror(state->req, status)) {
return;
}
finddcs_cldap_next_server(state);
}
NTSTATUS finddcs_cldap_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, struct finddcs *io)
{
struct finddcs_cldap_state *state = tevent_req_data(req, struct finddcs_cldap_state);
bool ok;
NTSTATUS status;
ok = tevent_req_poll(req, state->ev);
if (!ok) {
talloc_free(req);
return NT_STATUS_INTERNAL_ERROR;
}
status = tevent_req_simple_recv_ntstatus(req);
if (NT_STATUS_IS_OK(status)) {
talloc_steal(mem_ctx, state->netlogon);
io->out.netlogon = state->netlogon->out.netlogon;
io->out.address = talloc_steal(mem_ctx, state->srv_addresses[state->srv_address_index]);
}
tevent_req_received(req);
return status;
}
NTSTATUS finddcs_cldap(TALLOC_CTX *mem_ctx,
struct finddcs *io,
struct resolve_context *resolve_ctx,
struct tevent_context *event_ctx)
{
NTSTATUS status;
struct tevent_req *req = finddcs_cldap_send(mem_ctx,
io,
resolve_ctx,
event_ctx);
status = finddcs_cldap_recv(req, mem_ctx, io);
talloc_free(req);
return status;
}
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