mirror of
https://github.com/samba-team/samba.git
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158ae8a148
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
386 lines
11 KiB
C
386 lines
11 KiB
C
/*
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Unix SMB/CIFS implementation.
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a composite API for finding a DC and its name via CLDAP
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Copyright (C) Andrew Tridgell 2010
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Copyright (C) Andrew Bartlett 2010
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "include/includes.h"
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#include <tevent.h>
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#include "libcli/resolve/resolve.h"
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#include "lib/messaging/messaging.h"
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#include "libcli/libcli.h"
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#include "libcli/cldap/cldap.h"
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#include "libcli/finddc.h"
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#include "libcli/security/security.h"
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#include "lib/util/tevent_ntstatus.h"
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#include "libcli/composite/composite.h"
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struct finddcs_cldap_state {
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struct tevent_context *ev;
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struct tevent_req *req;
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const char *domain_name;
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struct dom_sid *domain_sid;
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const char *srv_name;
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const char **srv_addresses;
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uint32_t minimum_dc_flags;
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uint32_t srv_address_index;
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struct cldap_socket *cldap;
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struct cldap_netlogon *netlogon;
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};
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static void finddcs_cldap_srv_resolved(struct composite_context *ctx);
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static void finddcs_cldap_netlogon_replied(struct tevent_req *req);
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static bool finddcs_cldap_srv_lookup(struct finddcs_cldap_state *state,
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struct finddcs *io,
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struct resolve_context *resolve_ctx,
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struct tevent_context *event_ctx);
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static bool finddcs_cldap_nbt_lookup(struct finddcs_cldap_state *state,
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struct finddcs *io,
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struct resolve_context *resolve_ctx,
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struct tevent_context *event_ctx);
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static void finddcs_cldap_name_resolved(struct composite_context *ctx);
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static void finddcs_cldap_next_server(struct finddcs_cldap_state *state);
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static bool finddcs_cldap_ipaddress(struct finddcs_cldap_state *state, struct finddcs *io);
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/*
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* find a list of DCs via DNS/CLDAP
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*
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*/
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struct tevent_req *finddcs_cldap_send(TALLOC_CTX *mem_ctx,
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struct finddcs *io,
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struct resolve_context *resolve_ctx,
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struct tevent_context *event_ctx)
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{
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struct finddcs_cldap_state *state;
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struct tevent_req *req;
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req = tevent_req_create(mem_ctx, &state, struct finddcs_cldap_state);
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if (req == NULL) {
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return NULL;
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}
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state->req = req;
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state->ev = event_ctx;
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state->minimum_dc_flags = io->in.minimum_dc_flags;
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state->domain_name = talloc_strdup(state, io->in.domain_name);
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if (tevent_req_nomem(state->domain_name, req)) {
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return tevent_req_post(req, event_ctx);
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}
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if (io->in.domain_sid) {
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state->domain_sid = dom_sid_dup(state, io->in.domain_sid);
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if (tevent_req_nomem(state->domain_sid, req)) {
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return tevent_req_post(req, event_ctx);
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}
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} else {
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state->domain_sid = NULL;
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}
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if (io->in.server_address) {
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DEBUG(4,("finddcs: searching for a DC by IP %s\n", io->in.server_address));
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if (!finddcs_cldap_ipaddress(state, io)) {
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return tevent_req_post(req, event_ctx);
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}
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} else if (strchr(state->domain_name, '.')) {
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/* looks like a DNS name */
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DEBUG(4,("finddcs: searching for a DC by DNS domain %s\n", state->domain_name));
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if (!finddcs_cldap_srv_lookup(state, io, resolve_ctx, event_ctx)) {
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return tevent_req_post(req, event_ctx);
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}
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} else {
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DEBUG(4,("finddcs: searching for a DC by NBT lookup %s\n", state->domain_name));
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if (!finddcs_cldap_nbt_lookup(state, io, resolve_ctx, event_ctx)) {
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return tevent_req_post(req, event_ctx);
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}
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}
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return req;
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}
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/*
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we've been told the IP of the server, bypass name
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resolution and go straight to CLDAP
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*/
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static bool finddcs_cldap_ipaddress(struct finddcs_cldap_state *state, struct finddcs *io)
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{
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NTSTATUS status;
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state->srv_addresses = talloc_array(state, const char *, 2);
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if (tevent_req_nomem(state->srv_addresses, state->req)) {
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return false;
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}
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state->srv_addresses[0] = talloc_strdup(state->srv_addresses, io->in.server_address);
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if (tevent_req_nomem(state->srv_addresses[0], state->req)) {
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return false;
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}
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state->srv_addresses[1] = NULL;
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state->srv_address_index = 0;
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status = cldap_socket_init(state, state->ev, NULL, NULL, &state->cldap);
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if (tevent_req_nterror(state->req, status)) {
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return false;
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}
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finddcs_cldap_next_server(state);
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return tevent_req_is_nterror(state->req, &status);
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}
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/*
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start a SRV DNS lookup
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*/
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static bool finddcs_cldap_srv_lookup(struct finddcs_cldap_state *state,
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struct finddcs *io,
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struct resolve_context *resolve_ctx,
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struct tevent_context *event_ctx)
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{
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struct composite_context *creq;
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struct nbt_name name;
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if (io->in.site_name) {
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state->srv_name = talloc_asprintf(state, "_ldap._tcp.%s._sites.%s",
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io->in.site_name, io->in.domain_name);
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} else {
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state->srv_name = talloc_asprintf(state, "_ldap._tcp.%s", io->in.domain_name);
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}
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DEBUG(4,("finddcs: looking for SRV records for %s\n", state->srv_name));
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make_nbt_name(&name, state->srv_name, 0);
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creq = resolve_name_ex_send(resolve_ctx, state,
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RESOLVE_NAME_FLAG_FORCE_DNS | RESOLVE_NAME_FLAG_DNS_SRV,
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0, &name, event_ctx);
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if (tevent_req_nomem(creq, state->req)) {
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return false;
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}
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creq->async.fn = finddcs_cldap_srv_resolved;
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creq->async.private_data = state;
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return true;
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}
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/*
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start a NBT name lookup for domain<1C>
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*/
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static bool finddcs_cldap_nbt_lookup(struct finddcs_cldap_state *state,
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struct finddcs *io,
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struct resolve_context *resolve_ctx,
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struct tevent_context *event_ctx)
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{
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struct composite_context *creq;
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struct nbt_name name;
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make_nbt_name(&name, state->domain_name, NBT_NAME_LOGON);
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creq = resolve_name_send(resolve_ctx, state, &name, event_ctx);
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if (tevent_req_nomem(creq, state->req)) {
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return false;
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}
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creq->async.fn = finddcs_cldap_name_resolved;
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creq->async.private_data = state;
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return true;
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}
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/*
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fire off a CLDAP query to the next server
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*/
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static void finddcs_cldap_next_server(struct finddcs_cldap_state *state)
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{
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struct tevent_req *subreq;
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if (state->srv_addresses[state->srv_address_index] == NULL) {
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tevent_req_nterror(state->req, NT_STATUS_OBJECT_NAME_NOT_FOUND);
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DEBUG(2,("finddcs: No matching CLDAP server found\n"));
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return;
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}
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state->netlogon = talloc_zero(state, struct cldap_netlogon);
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if (tevent_req_nomem(state->netlogon, state->req)) {
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return;
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}
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state->netlogon->in.dest_address = state->srv_addresses[state->srv_address_index];
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/* we should get the port from the SRV response */
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state->netlogon->in.dest_port = 389;
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if (strchr(state->domain_name, '.')) {
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state->netlogon->in.realm = state->domain_name;
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}
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if (state->domain_sid) {
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state->netlogon->in.domain_sid = dom_sid_string(state, state->domain_sid);
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if (tevent_req_nomem(state->netlogon->in.domain_sid, state->req)) {
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return;
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}
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}
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state->netlogon->in.acct_control = -1;
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state->netlogon->in.version =
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NETLOGON_NT_VERSION_5 |
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NETLOGON_NT_VERSION_5EX |
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NETLOGON_NT_VERSION_IP;
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state->netlogon->in.map_response = true;
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DEBUG(4,("finddcs: performing CLDAP query on %s\n", state->netlogon->in.dest_address));
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subreq = cldap_netlogon_send(state, state->cldap, state->netlogon);
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if (tevent_req_nomem(subreq, state->req)) {
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return;
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}
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tevent_req_set_callback(subreq, finddcs_cldap_netlogon_replied, state);
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}
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/*
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we have a response from a CLDAP server for a netlogon request
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*/
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static void finddcs_cldap_netlogon_replied(struct tevent_req *subreq)
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{
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struct finddcs_cldap_state *state;
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NTSTATUS status;
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state = tevent_req_callback_data(subreq, struct finddcs_cldap_state);
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status = cldap_netlogon_recv(subreq, state->netlogon, state->netlogon);
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talloc_free(subreq);
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if (!NT_STATUS_IS_OK(status)) {
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state->srv_address_index++;
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finddcs_cldap_next_server(state);
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return;
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}
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if (state->minimum_dc_flags !=
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(state->minimum_dc_flags & state->netlogon->out.netlogon.data.nt5_ex.server_type)) {
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/* the server didn't match the minimum requirements */
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DEBUG(4,("finddcs: Skipping DC %s with server_type=0x%08x - required 0x%08x\n",
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state->srv_addresses[state->srv_address_index],
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state->netlogon->out.netlogon.data.nt5_ex.server_type,
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state->minimum_dc_flags));
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state->srv_address_index++;
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finddcs_cldap_next_server(state);
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return;
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}
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DEBUG(4,("finddcs: Found matching DC %s with server_type=0x%08x\n",
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state->srv_addresses[state->srv_address_index],
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state->netlogon->out.netlogon.data.nt5_ex.server_type));
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tevent_req_done(state->req);
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}
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/*
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handle NBT name lookup reply
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*/
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static void finddcs_cldap_name_resolved(struct composite_context *ctx)
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{
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struct finddcs_cldap_state *state =
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talloc_get_type(ctx->async.private_data, struct finddcs_cldap_state);
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const char *address;
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NTSTATUS status;
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status = resolve_name_recv(ctx, state, &address);
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if (tevent_req_nterror(state->req, status)) {
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DEBUG(2,("finddcs: No matching NBT <1c> server found\n"));
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return;
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}
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DEBUG(4,("finddcs: Found NBT <1c> server at %s\n", address));
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state->srv_addresses = talloc_array(state, const char *, 2);
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if (tevent_req_nomem(state->srv_addresses, state->req)) {
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return;
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}
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state->srv_addresses[0] = address;
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state->srv_addresses[1] = NULL;
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state->srv_address_index = 0;
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status = cldap_socket_init(state, state->ev, NULL, NULL, &state->cldap);
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if (tevent_req_nterror(state->req, status)) {
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return;
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}
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finddcs_cldap_next_server(state);
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}
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/*
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* Having got a DNS SRV answer, fire off the first CLDAP request
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*/
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static void finddcs_cldap_srv_resolved(struct composite_context *ctx)
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{
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struct finddcs_cldap_state *state =
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talloc_get_type(ctx->async.private_data, struct finddcs_cldap_state);
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NTSTATUS status;
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unsigned i;
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status = resolve_name_multiple_recv(ctx, state, &state->srv_addresses);
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if (tevent_req_nterror(state->req, status)) {
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DEBUG(2,("finddcs: Failed to find SRV record for %s\n", state->srv_name));
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return;
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}
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for (i=0; state->srv_addresses[i]; i++) {
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DEBUG(4,("finddcs: DNS server %u at '%s'\n", i, state->srv_addresses[i]));
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}
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state->srv_address_index = 0;
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status = cldap_socket_init(state, state->ev, NULL, NULL, &state->cldap);
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if (tevent_req_nterror(state->req, status)) {
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return;
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}
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finddcs_cldap_next_server(state);
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}
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NTSTATUS finddcs_cldap_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, struct finddcs *io)
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{
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struct finddcs_cldap_state *state = tevent_req_data(req, struct finddcs_cldap_state);
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bool ok;
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NTSTATUS status;
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ok = tevent_req_poll(req, state->ev);
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if (!ok) {
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talloc_free(req);
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return NT_STATUS_INTERNAL_ERROR;
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}
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status = tevent_req_simple_recv_ntstatus(req);
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if (NT_STATUS_IS_OK(status)) {
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talloc_steal(mem_ctx, state->netlogon);
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io->out.netlogon = state->netlogon->out.netlogon;
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io->out.address = talloc_steal(mem_ctx, state->srv_addresses[state->srv_address_index]);
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}
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tevent_req_received(req);
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return status;
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}
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NTSTATUS finddcs_cldap(TALLOC_CTX *mem_ctx,
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struct finddcs *io,
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struct resolve_context *resolve_ctx,
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struct tevent_context *event_ctx)
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{
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NTSTATUS status;
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struct tevent_req *req = finddcs_cldap_send(mem_ctx,
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io,
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resolve_ctx,
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event_ctx);
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status = finddcs_cldap_recv(req, mem_ctx, io);
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talloc_free(req);
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return status;
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}
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