2 Unix SMB/CIFS implementation.
4 a composite API for finding a DC and its name via CLDAP
6 Copyright (C) Andrew Tridgell 2010
7 Copyright (C) Andrew Bartlett 2010
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "include/includes.h"
25 #include "libcli/resolve/resolve.h"
26 #include "lib/messaging/messaging.h"
27 #include "libcli/libcli.h"
28 #include "libcli/cldap/cldap.h"
29 #include "libcli/finddc.h"
30 #include "libcli/security/dom_sid.h"
31 #include "lib/util/tevent_ntstatus.h"
32 #include "libcli/composite/composite.h"
34 struct finddcs_cldap_state {
35 struct tevent_context *ev;
36 struct tevent_req *req;
37 const char *domain_name;
38 struct dom_sid *domain_sid;
39 const char **srv_addresses;
40 uint32_t minimum_dc_flags;
41 uint32_t srv_address_index;
42 struct cldap_socket *cldap;
43 struct cldap_netlogon *netlogon;
46 static void finddcs_cldap_srv_resolved(struct composite_context *ctx);
47 static void finddcs_cldap_netlogon_replied(struct tevent_req *req);
48 static bool finddcs_cldap_srv_lookup(struct finddcs_cldap_state *state,
50 struct resolve_context *resolve_ctx,
51 struct tevent_context *event_ctx);
52 static bool finddcs_cldap_nbt_lookup(struct finddcs_cldap_state *state,
54 struct resolve_context *resolve_ctx,
55 struct tevent_context *event_ctx);
56 static void finddcs_cldap_name_resolved(struct composite_context *ctx);
60 * find a list of DCs via DNS/CLDAP
63 struct tevent_req *finddcs_cldap_send(TALLOC_CTX *mem_ctx,
65 struct resolve_context *resolve_ctx,
66 struct tevent_context *event_ctx)
68 struct finddcs_cldap_state *state;
69 struct tevent_req *req;
71 req = tevent_req_create(mem_ctx, &state, struct finddcs_cldap_state);
77 state->ev = event_ctx;
78 state->minimum_dc_flags = io->in.minimum_dc_flags;
79 state->domain_name = talloc_strdup(state, io->in.domain_name);
80 if (tevent_req_nomem(state->domain_name, req)) {
81 return tevent_req_post(req, event_ctx);
84 if (io->in.domain_sid) {
85 state->domain_sid = dom_sid_dup(state, io->in.domain_sid);
86 if (tevent_req_nomem(state->domain_sid, req)) {
87 return tevent_req_post(req, event_ctx);
90 state->domain_sid = NULL;
93 if (strchr(state->domain_name, '.')) {
94 /* looks like a DNS name */
95 if (!finddcs_cldap_srv_lookup(state, io, resolve_ctx, event_ctx)) {
96 return tevent_req_post(req, event_ctx);
99 if (!finddcs_cldap_nbt_lookup(state, io, resolve_ctx, event_ctx)) {
100 return tevent_req_post(req, event_ctx);
108 start a SRV DNS lookup
110 static bool finddcs_cldap_srv_lookup(struct finddcs_cldap_state *state,
112 struct resolve_context *resolve_ctx,
113 struct tevent_context *event_ctx)
115 const char *srv_name;
116 struct composite_context *creq;
117 struct nbt_name name;
119 if (io->in.site_name) {
120 srv_name = talloc_asprintf(state, "_ldap._tcp.%s._sites.%s",
121 io->in.site_name, io->in.domain_name);
123 srv_name = talloc_asprintf(state, "_ldap._tcp.%s", io->in.domain_name);
126 make_nbt_name(&name, srv_name, 0);
128 creq = resolve_name_ex_send(resolve_ctx, state,
129 RESOLVE_NAME_FLAG_FORCE_DNS | RESOLVE_NAME_FLAG_DNS_SRV,
130 0, &name, event_ctx);
131 if (tevent_req_nomem(creq, state->req)) {
134 creq->async.fn = finddcs_cldap_srv_resolved;
135 creq->async.private_data = state;
141 start a NBT name lookup for domain<1C>
143 static bool finddcs_cldap_nbt_lookup(struct finddcs_cldap_state *state,
145 struct resolve_context *resolve_ctx,
146 struct tevent_context *event_ctx)
148 struct composite_context *creq;
149 struct nbt_name name;
151 make_nbt_name(&name, state->domain_name, NBT_NAME_LOGON);
152 creq = resolve_name_send(resolve_ctx, state, &name, event_ctx);
153 if (tevent_req_nomem(creq, state->req)) {
156 creq->async.fn = finddcs_cldap_name_resolved;
157 creq->async.private_data = state;
162 fire off a CLDAP query to the next server
164 static void finddcs_cldap_next_server(struct finddcs_cldap_state *state)
166 struct tevent_req *subreq;
168 if (state->srv_addresses[state->srv_address_index] == NULL) {
169 tevent_req_nterror(state->req, NT_STATUS_OBJECT_NAME_NOT_FOUND);
173 state->netlogon = talloc_zero(state, struct cldap_netlogon);
174 if (tevent_req_nomem(state->netlogon, state->req)) {
178 state->netlogon->in.dest_address = state->srv_addresses[state->srv_address_index];
179 /* we should get the port from the SRV response */
180 state->netlogon->in.dest_port = 389;
181 if (strchr(state->domain_name, '.')) {
182 state->netlogon->in.realm = state->domain_name;
184 if (state->domain_sid) {
185 state->netlogon->in.domain_sid = dom_sid_string(state, state->domain_sid);
186 if (tevent_req_nomem(state->netlogon->in.domain_sid, state->req)) {
190 state->netlogon->in.acct_control = -1;
191 state->netlogon->in.version =
192 NETLOGON_NT_VERSION_5 |
193 NETLOGON_NT_VERSION_5EX |
194 NETLOGON_NT_VERSION_IP;
195 state->netlogon->in.map_response = true;
197 subreq = cldap_netlogon_send(state, state->cldap, state->netlogon);
198 if (tevent_req_nomem(subreq, state->req)) {
202 tevent_req_set_callback(subreq, finddcs_cldap_netlogon_replied, state);
207 we have a response from a CLDAP server for a netlogon request
209 static void finddcs_cldap_netlogon_replied(struct tevent_req *subreq)
211 struct finddcs_cldap_state *state;
214 state = tevent_req_callback_data(subreq, struct finddcs_cldap_state);
216 status = cldap_netlogon_recv(subreq, state->netlogon, state->netlogon);
218 if (!NT_STATUS_IS_OK(status)) {
219 state->srv_address_index++;
220 finddcs_cldap_next_server(state);
223 if (state->minimum_dc_flags !=
224 (state->minimum_dc_flags & state->netlogon->out.netlogon.data.nt5_ex.server_type)) {
225 /* the server didn't match the minimum requirements */
226 DEBUG(4,(__location__ ": Skipping DC %s with server_type=0x%08x - required 0x%08x\n",
227 state->srv_addresses[state->srv_address_index],
228 state->netlogon->out.netlogon.data.nt5_ex.server_type,
229 state->minimum_dc_flags));
230 state->srv_address_index++;
231 finddcs_cldap_next_server(state);
235 tevent_req_done(state->req);
239 handle NBT name lookup reply
241 static void finddcs_cldap_name_resolved(struct composite_context *ctx)
243 struct finddcs_cldap_state *state =
244 talloc_get_type(ctx->async.private_data, struct finddcs_cldap_state);
248 status = resolve_name_recv(ctx, state, &address);
249 if (tevent_req_nterror(state->req, status)) {
253 state->srv_addresses = talloc_array(state, const char *, 2);
254 if (tevent_req_nomem(state->srv_addresses, state->req)) {
257 state->srv_addresses[0] = address;
258 state->srv_addresses[1] = NULL;
260 state->srv_address_index = 0;
262 status = cldap_socket_init(state, state->ev, NULL, NULL, &state->cldap);
263 if (tevent_req_nterror(state->req, status)) {
267 finddcs_cldap_next_server(state);
272 * Having got a DNS SRV answer, fire off the first CLDAP request
274 static void finddcs_cldap_srv_resolved(struct composite_context *ctx)
276 struct finddcs_cldap_state *state =
277 talloc_get_type(ctx->async.private_data, struct finddcs_cldap_state);
280 status = resolve_name_multiple_recv(ctx, state, &state->srv_addresses);
281 if (tevent_req_nterror(state->req, status)) {
285 state->srv_address_index = 0;
287 status = cldap_socket_init(state, state->ev, NULL, NULL, &state->cldap);
288 if (tevent_req_nterror(state->req, status)) {
292 finddcs_cldap_next_server(state);
296 NTSTATUS finddcs_cldap_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, struct finddcs *io)
298 struct finddcs_cldap_state *state = tevent_req_data(req, struct finddcs_cldap_state);
302 ok = tevent_req_poll(req, state->ev);
305 return NT_STATUS_INTERNAL_ERROR;
307 status = tevent_req_simple_recv_ntstatus(req);
308 if (NT_STATUS_IS_OK(status)) {
309 talloc_steal(mem_ctx, state->netlogon);
310 io->out.netlogon = state->netlogon->out.netlogon;
311 io->out.address = talloc_steal(mem_ctx, state->srv_addresses[state->srv_address_index]);
313 tevent_req_received(req);
317 NTSTATUS finddcs_cldap(TALLOC_CTX *mem_ctx,
319 struct resolve_context *resolve_ctx,
320 struct tevent_context *event_ctx)
323 struct tevent_req *req = finddcs_cldap_send(mem_ctx,
327 status = finddcs_cldap_recv(req, mem_ctx, io);