source4/nbt_server/wins/winswack.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    "secure" wins server WACK processing
   5
   6    Copyright (C) Andrew Tridgell        2005
   7    Copyright (C) Stefan Metzmacher      2005
   8
   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.
  13
  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.
  18
  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/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "nbt_server/nbt_server.h"
  25 #include "nbt_server/wins/winsdb.h"
  26 #include "nbt_server/wins/winsserver.h"
  27 #include "system/time.h"
  28 #include "libcli/composite/composite.h"
  29 #include "param/param.h"
  30 #include "smbd/service_task.h"
  31
  32 struct wins_challenge_state {
  33         struct wins_challenge_io *io;
  34         uint32_t current_address;
  35         struct nbt_name_query query;
  36 };
  37
  38 static void wins_challenge_handler(struct nbt_name_request *req)
  39 {
  40         struct composite_context *ctx = talloc_get_type(req->async.private_data, struct composite_context);
  41         struct wins_challenge_state *state = talloc_get_type(ctx->private_data, struct wins_challenge_state);
  42
  43         ctx->status = nbt_name_query_recv(req, state, &state->query);
  44
  45         /* if we timed out then try the next owner address, if any */
  46         if (NT_STATUS_EQUAL(ctx->status, NT_STATUS_IO_TIMEOUT)) {
  47                 state->current_address++;
  48                 if (state->current_address < state->io->in.num_addresses) {
  49                         struct nbtd_interface *iface;
  50
  51                         state->query.in.dest_port = state->io->in.nbt_port;
  52                         state->query.in.dest_addr = state->io->in.addresses[state->current_address];
  53
  54                         iface = nbtd_find_request_iface(state->io->in.nbtd_server, state->query.in.dest_addr, true);
  55                         if (!iface) {
  56                                 composite_error(ctx, NT_STATUS_INTERNAL_ERROR);
  57                                 return;
  58                         }
  59
  60                         ZERO_STRUCT(state->query.out);
  61                         req = nbt_name_query_send(iface->nbtsock, &state->query);
  62                         composite_continue_nbt(ctx, req, wins_challenge_handler, ctx);
  63                         return;
  64                 }
  65         }
  66
  67         composite_done(ctx);
  68 }
  69
  70 NTSTATUS wins_challenge_recv(struct composite_context *ctx, TALLOC_CTX *mem_ctx, struct wins_challenge_io *io)
  71 {
  72         NTSTATUS status = ctx->status;
  73         struct wins_challenge_state *state = talloc_get_type(ctx->private_data, struct wins_challenge_state);
  74
  75         if (NT_STATUS_IS_OK(status)) {
  76                 io->out.num_addresses   = state->query.out.num_addrs;
  77                 io->out.addresses       = state->query.out.reply_addrs;
  78                 talloc_steal(mem_ctx, io->out.addresses);
  79         } else {
  80                 ZERO_STRUCT(io->out);
  81         }
  82
  83         talloc_free(ctx);
  84         return status;
  85 }
  86
  87 struct composite_context *wins_challenge_send(TALLOC_CTX *mem_ctx, struct wins_challenge_io *io)
  88 {
  89         struct composite_context *result;
  90         struct wins_challenge_state *state;
  91         struct nbt_name_request *req;
  92         struct nbtd_interface *iface;
  93
  94         result = talloc_zero(mem_ctx, struct composite_context);
  95         if (result == NULL) return NULL;
  96         result->state = COMPOSITE_STATE_IN_PROGRESS;
  97         result->event_ctx = talloc_reference(result, io->in.event_ctx);
  98
  99         state = talloc_zero(result, struct wins_challenge_state);
 100         if (state == NULL) goto failed;
 101         result->private_data = state;
 102
 103         /* package up the state variables for this wack request */
 104         state->io               = io;
 105         state->current_address  = 0;
 106
 107         /* setup a name query to the first address */
 108         state->query.in.name        = *state->io->in.name;
 109         state->query.in.dest_port   = state->io->in.nbt_port;
 110         state->query.in.dest_addr   = state->io->in.addresses[state->current_address];
 111         state->query.in.broadcast   = false;
 112         state->query.in.wins_lookup = true;
 113         state->query.in.timeout     = 1;
 114         state->query.in.retries     = 2;
 115         ZERO_STRUCT(state->query.out);
 116
 117         iface = nbtd_find_request_iface(state->io->in.nbtd_server, state->query.in.dest_addr, true);
 118         if (!iface) {
 119                 goto failed;
 120         }
 121
 122         req = nbt_name_query_send(iface->nbtsock, &state->query);
 123         if (req == NULL) goto failed;
 124
 125         req->async.fn = wins_challenge_handler;
 126         req->async.private_data = result;
 127
 128         return result;
 129 failed:
 130         talloc_free(result);
 131         return NULL;
 132 }
 133
 134 struct wins_release_demand_io {
 135         struct {
 136                 struct nbtd_server *nbtd_server;
 137                 struct tevent_context *event_ctx;
 138                 struct nbt_name *name;
 139                 uint16_t nb_flags;
 140                 uint32_t num_addresses;
 141                 const char **addresses;
 142         } in;
 143 };
 144
 145 struct wins_release_demand_state {
 146         struct wins_release_demand_io *io;
 147         uint32_t current_address;
 148         uint32_t addresses_left;
 149         struct nbt_name_release release;
 150 };
 151
 152 static void wins_release_demand_handler(struct nbt_name_request *req)
 153 {
 154         struct composite_context *ctx = talloc_get_type(req->async.private_data, struct composite_context);
 155         struct wins_release_demand_state *state = talloc_get_type(ctx->private_data, struct wins_release_demand_state);
 156
 157         ctx->status = nbt_name_release_recv(req, state, &state->release);
 158
 159         /* if we timed out then try the next owner address, if any */
 160         if (NT_STATUS_EQUAL(ctx->status, NT_STATUS_IO_TIMEOUT)) {
 161                 state->current_address++;
 162                 state->addresses_left--;
 163                 if (state->current_address < state->io->in.num_addresses) {
 164                         struct nbtd_interface *iface;
 165
 166                         state->release.in.dest_port = lp_nbt_port(state->io->in.nbtd_server->task->lp_ctx);
 167                         state->release.in.dest_addr = state->io->in.addresses[state->current_address];
 168                         state->release.in.address   = state->release.in.dest_addr;
 169                         state->release.in.timeout   = (state->addresses_left > 1 ? 2 : 1);
 170                         state->release.in.retries   = (state->addresses_left > 1 ? 0 : 2);
 171
 172                         iface = nbtd_find_request_iface(state->io->in.nbtd_server, state->release.in.dest_addr, true);
 173                         if (!iface) {
 174                                 composite_error(ctx, NT_STATUS_INTERNAL_ERROR);
 175                                 return;
 176                         }
 177
 178                         ZERO_STRUCT(state->release.out);
 179                         req = nbt_name_release_send(iface->nbtsock, &state->release);
 180                         composite_continue_nbt(ctx, req, wins_release_demand_handler, ctx);
 181                         return;
 182                 }
 183         }
 184
 185         composite_done(ctx);
 186 }
 187
 188 static NTSTATUS wins_release_demand_recv(struct composite_context *ctx,
 189                                          TALLOC_CTX *mem_ctx,
 190                                          struct wins_release_demand_io *io)
 191 {
 192         NTSTATUS status = ctx->status;
 193         talloc_free(ctx);
 194         return status;
 195 }
 196
 197 static struct composite_context *wins_release_demand_send(TALLOC_CTX *mem_ctx, struct wins_release_demand_io *io)
 198 {
 199         struct composite_context *result;
 200         struct wins_release_demand_state *state;
 201         struct nbt_name_request *req;
 202         struct nbtd_interface *iface;
 203
 204         result = talloc_zero(mem_ctx, struct composite_context);
 205         if (result == NULL) return NULL;
 206         result->state = COMPOSITE_STATE_IN_PROGRESS;
 207         result->event_ctx = talloc_reference(result, io->in.event_ctx);
 208
 209         state = talloc_zero(result, struct wins_release_demand_state);
 210         if (state == NULL) goto failed;
 211         result->private_data = state;
 212
 213         /* package up the state variables for this wack request */
 214         state->io               = io;
 215         state->current_address  = 0;
 216         state->addresses_left   = state->io->in.num_addresses;
 217
 218         /*
 219          * setup a name query to the first address
 220          * - if we have more than one address try the first
 221          *   with 2 secs timeout and no retry
 222          * - otherwise use 1 sec timeout (w2k3 uses 0.5 sec here)
 223          *   with 2 retries
 224          */
 225         state->release.in.name        = *state->io->in.name;
 226         state->release.in.dest_port   = lp_nbt_port(state->io->in.nbtd_server->task->lp_ctx);
 227         state->release.in.dest_addr   = state->io->in.addresses[state->current_address];
 228         state->release.in.address     = state->release.in.dest_addr;
 229         state->release.in.broadcast   = false;
 230         state->release.in.timeout     = (state->addresses_left > 1 ? 2 : 1);
 231         state->release.in.retries     = (state->addresses_left > 1 ? 0 : 2);
 232         ZERO_STRUCT(state->release.out);
 233
 234         iface = nbtd_find_request_iface(state->io->in.nbtd_server, state->release.in.dest_addr, true);
 235         if (!iface) {
 236                 goto failed;
 237         }
 238
 239         req = nbt_name_release_send(iface->nbtsock, &state->release);
 240         if (req == NULL) goto failed;
 241
 242         req->async.fn = wins_release_demand_handler;
 243         req->async.private_data = result;
 244
 245         return result;
 246 failed:
 247         talloc_free(result);
 248         return NULL;
 249 }
 250
 251 /*
 252   wrepl_server needs to be able to do a name query request, but some windows
 253   servers always send the reply to port 137, regardless of the request
 254   port. To cope with this we use a irpc request to the NBT server
 255   which has port 137 open, and thus can receive the replies
 256 */
 257 struct proxy_wins_challenge_state {
 258         struct irpc_message *msg;
 259         struct nbtd_proxy_wins_challenge *req;
 260         struct wins_challenge_io io;
 261         struct composite_context *c_req;
 262 };
 263
 264 static void proxy_wins_challenge_handler(struct composite_context *c_req)
 265 {
 266         NTSTATUS status;
 267         uint32_t i;
 268         struct proxy_wins_challenge_state *s = talloc_get_type(c_req->async.private_data,
 269                                                                struct proxy_wins_challenge_state);
 270
 271         status = wins_challenge_recv(s->c_req, s, &s->io);
 272         if (!NT_STATUS_IS_OK(status)) {
 273                 ZERO_STRUCT(s->req->out);
 274                 irpc_send_reply(s->msg, status);
 275                 return;
 276         }
 277
 278         s->req->out.num_addrs   = s->io.out.num_addresses;
 279         /* TODO: fix pidl to handle inline ipv4address arrays */
 280         s->req->out.addrs       = talloc_array(s->msg, struct nbtd_proxy_wins_addr,
 281                                                s->io.out.num_addresses);
 282         if (!s->req->out.addrs) {
 283                 ZERO_STRUCT(s->req->out);
 284                 irpc_send_reply(s->msg, NT_STATUS_NO_MEMORY);
 285                 return;
 286         }
 287         for (i=0; i < s->io.out.num_addresses; i++) {
 288                 s->req->out.addrs[i].addr = talloc_steal(s->req->out.addrs, s->io.out.addresses[i]);
 289         }
 290
 291         irpc_send_reply(s->msg, status);
 292 }
 293
 294 NTSTATUS nbtd_proxy_wins_challenge(struct irpc_message *msg,
 295                                    struct nbtd_proxy_wins_challenge *req)
 296 {
 297         struct nbtd_server *nbtd_server =
 298                 talloc_get_type(msg->private_data, struct nbtd_server);
 299         struct proxy_wins_challenge_state *s;
 300         uint32_t i;
 301
 302         s = talloc(msg, struct proxy_wins_challenge_state);
 303         NT_STATUS_HAVE_NO_MEMORY(s);
 304
 305         s->msg = msg;
 306         s->req = req;
 307
 308         s->io.in.nbtd_server    = nbtd_server;
 309         s->io.in.nbt_port       = lp_nbt_port(nbtd_server->task->lp_ctx);
 310         s->io.in.event_ctx      = msg->ev;
 311         s->io.in.name           = &req->in.name;
 312         s->io.in.num_addresses  = req->in.num_addrs;
 313         s->io.in.addresses      = talloc_array(s, const char *, req->in.num_addrs);
 314         NT_STATUS_HAVE_NO_MEMORY(s->io.in.addresses);
 315         /* TODO: fix pidl to handle inline ipv4address arrays */
 316         for (i=0; i < req->in.num_addrs; i++) {
 317                 s->io.in.addresses[i]   = talloc_steal(s->io.in.addresses, req->in.addrs[i].addr);
 318         }
 319
 320         s->c_req = wins_challenge_send(s, &s->io);
 321         NT_STATUS_HAVE_NO_MEMORY(s->c_req);
 322
 323         s->c_req->async.fn              = proxy_wins_challenge_handler;
 324         s->c_req->async.private_data    = s;
 325
 326         msg->defer_reply = true;
 327         return NT_STATUS_OK;
 328 }
 329
 330 /*
 331   wrepl_server needs to be able to do a name release demands, but some windows
 332   servers always send the reply to port 137, regardless of the request
 333   port. To cope with this we use a irpc request to the NBT server
 334   which has port 137 open, and thus can receive the replies
 335 */
 336 struct proxy_wins_release_demand_state {
 337         struct irpc_message *msg;
 338         struct nbtd_proxy_wins_release_demand *req;
 339         struct wins_release_demand_io io;
 340         struct composite_context *c_req;
 341 };
 342
 343 static void proxy_wins_release_demand_handler(struct composite_context *c_req)
 344 {
 345         NTSTATUS status;
 346         struct proxy_wins_release_demand_state *s = talloc_get_type(c_req->async.private_data,
 347                                                                struct proxy_wins_release_demand_state);
 348
 349         status = wins_release_demand_recv(s->c_req, s, &s->io);
 350
 351         irpc_send_reply(s->msg, status);
 352 }
 353
 354 NTSTATUS nbtd_proxy_wins_release_demand(struct irpc_message *msg,
 355                                    struct nbtd_proxy_wins_release_demand *req)
 356 {
 357         struct nbtd_server *nbtd_server =
 358                 talloc_get_type(msg->private_data, struct nbtd_server);
 359         struct proxy_wins_release_demand_state *s;
 360         uint32_t i;
 361
 362         s = talloc(msg, struct proxy_wins_release_demand_state);
 363         NT_STATUS_HAVE_NO_MEMORY(s);
 364
 365         s->msg = msg;
 366         s->req = req;
 367
 368         s->io.in.nbtd_server    = nbtd_server;
 369         s->io.in.event_ctx      = msg->ev;
 370         s->io.in.name           = &req->in.name;
 371         s->io.in.num_addresses  = req->in.num_addrs;
 372         s->io.in.addresses      = talloc_array(s, const char *, req->in.num_addrs);
 373         NT_STATUS_HAVE_NO_MEMORY(s->io.in.addresses);
 374         /* TODO: fix pidl to handle inline ipv4address arrays */
 375         for (i=0; i < req->in.num_addrs; i++) {
 376                 s->io.in.addresses[i]   = talloc_steal(s->io.in.addresses, req->in.addrs[i].addr);
 377         }
 378
 379         s->c_req = wins_release_demand_send(s, &s->io);
 380         NT_STATUS_HAVE_NO_MEMORY(s->c_req);
 381
 382         s->c_req->async.fn              = proxy_wins_release_demand_handler;
 383         s->c_req->async.private_data    = s;
 384
 385         msg->defer_reply = true;
 386         return NT_STATUS_OK;
 387 }