s4-finddcs: added finddcs_cldap()
authorAndrew Tridgell <tridge@samba.org>
Tue, 14 Sep 2010 05:46:31 +0000 (15:46 +1000)
committerAndrew Tridgell <tridge@samba.org>
Wed, 15 Sep 2010 05:39:35 +0000 (15:39 +1000)
this finds DCs with a specified set of server_type bit using SRV
lookups and CLDAP

Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>

.gitignore
source4/libcli/finddcs.h [new file with mode: 0644]
source4/libcli/finddcs_cldap.c [new file with mode: 0644]
source4/libcli/wscript_build

index 12573c5..56bba7e 100644 (file)
@@ -180,7 +180,6 @@ source4/kdc/pac-glue_proto.h
 source4/ldap_server/proto.h
 source4/lib/charset/charset_proto.h
 source4/libcli/composite/proto.h
-source4/libcli/finddcs.h
 source4/libcli/ldap/ldap_proto.h
 source4/libcli/libcli_proto.h
 libcli/nbt/nbtname.h
diff --git a/source4/libcli/finddcs.h b/source4/libcli/finddcs.h
new file mode 100644 (file)
index 0000000..9e6e2df
--- /dev/null
@@ -0,0 +1,37 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   a composite API for finding a DC and its name
+
+   Copyright (C) Andrew Tridgell 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 "libcli/netlogon.h"
+
+struct finddcs {
+       struct {
+               const char *dns_domain_name;
+               const char *site_name; /* optional */
+               struct dom_sid *domain_sid; /* optional */
+               uint32_t minimum_dc_flags; /* DS_SERVER_* */
+       } in;
+       struct {
+               const char *address; /* IP address of server */
+               struct netlogon_samlogon_response netlogon;
+       } out;
+};
+
+#include "finddcs_proto.h"
diff --git a/source4/libcli/finddcs_cldap.c b/source4/libcli/finddcs_cldap.c
new file mode 100644 (file)
index 0000000..6842a09
--- /dev/null
@@ -0,0 +1,244 @@
+/*
+   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;
+}
index 8a2111d..3362310 100644 (file)
@@ -69,9 +69,9 @@ bld.SAMBA_SUBSYSTEM('LP_RESOLVE',
 
 
 bld.SAMBA_SUBSYSTEM('LIBCLI_FINDDCS',
-       source='finddcs.c',
-       autoproto='finddcs.h',
-       public_deps='LIBCLI_NBT MESSAGING RPC_NDR_IRPC'
+       source='finddcs.c finddcs_cldap.c',
+       autoproto='finddcs_proto.h',
+       public_deps='LIBCLI_NBT MESSAGING RPC_NDR_IRPC LIBCLI_CLDAP'
        )