source4/libnet/libnet_lookup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Rafal Szczesniak 2005
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 /*
  21   a composite function for name resolving
  22 */
  23
  24 #include "includes.h"
  25 #include "lib/events/events.h"
  26 #include "libnet/libnet.h"
  27 #include "libcli/composite/composite.h"
  28 #include "auth/credentials/credentials.h"
  29 #include "lib/messaging/messaging.h"
  30 #include "lib/messaging/irpc.h"
  31 #include "libcli/resolve/resolve.h"
  32 #include "libcli/libcli.h"
  33 #include "libcli/finddc.h"
  34 #include "libcli/security/security.h"
  35 #include "librpc/gen_ndr/lsa.h"
  36 #include "librpc/gen_ndr/ndr_lsa_c.h"
  37
  38 #include "param/param.h"
  39
  40 struct lookup_state {
  41         struct nbt_name hostname;
  42         const char *address;
  43 };
  44
  45
  46 static void continue_name_resolved(struct composite_context *ctx);
  47
  48
  49 /**
  50  * Sends asynchronous Lookup request
  51  *
  52  * @param io arguments and result of the call
  53  */
  54
  55 struct composite_context *libnet_Lookup_send(struct libnet_context *ctx,
  56                                              struct libnet_Lookup *io)
  57 {
  58         struct composite_context *c;
  59         struct lookup_state *s;
  60         struct composite_context *cresolve_req;
  61         struct resolve_context *resolve_ctx;
  62
  63         /* allocate context and state structures */
  64         c = composite_create(ctx, ctx->event_ctx);
  65         if (c == NULL) return NULL;
  66
  67         s = talloc_zero(c, struct lookup_state);
  68         if (composite_nomem(s, c)) return c;
  69
  70         c->private_data = s;
  71
  72         if (io == NULL || io->in.hostname == NULL) {
  73                 composite_error(c, NT_STATUS_INVALID_PARAMETER);
  74                 return c;
  75         }
  76
  77         /* parameters */
  78         s->hostname.name   = talloc_strdup(s, io->in.hostname);
  79         if (composite_nomem(s->hostname.name, c)) return c;
  80
  81         s->hostname.type   = io->in.type;
  82         s->hostname.scope  = NULL;
  83
  84         /* name resolution methods */
  85         if (io->in.resolve_ctx) {
  86                 resolve_ctx = io->in.resolve_ctx;
  87         } else {
  88                 resolve_ctx = ctx->resolve_ctx;
  89         }
  90
  91         /* send resolve request */
  92         cresolve_req = resolve_name_send(resolve_ctx, s, &s->hostname, c->event_ctx);
  93         if (composite_nomem(cresolve_req, c)) return c;
  94
  95         composite_continue(c, cresolve_req, continue_name_resolved, c);
  96         return c;
  97 }
  98
  99
 100 static void continue_name_resolved(struct composite_context *ctx)
 101 {
 102         struct composite_context *c;
 103         struct lookup_state *s;
 104
 105         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 106         s = talloc_get_type(c->private_data, struct lookup_state);
 107
 108         c->status = resolve_name_recv(ctx, s, &s->address);
 109
 110         composite_done(c);
 111 }
 112
 113
 114 /**
 115  * Waits for and receives results of asynchronous Lookup call
 116  *
 117  * @param c composite context returned by asynchronous Lookup call
 118  * @param mem_ctx memory context of the call
 119  * @param io pointer to results (and arguments) of the call
 120  * @return nt status code of execution
 121  */
 122
 123 NTSTATUS libnet_Lookup_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 124                             struct libnet_Lookup *io)
 125 {
 126         NTSTATUS status;
 127         struct lookup_state *s;
 128
 129         status = composite_wait(c);
 130         if (NT_STATUS_IS_OK(status)) {
 131                 s = talloc_get_type(c->private_data, struct lookup_state);
 132
 133                 io->out.address = (const char **)str_list_make_single(mem_ctx, s->address);
 134                 NT_STATUS_HAVE_NO_MEMORY(io->out.address);
 135         }
 136
 137         talloc_free(c);
 138         return status;
 139 }
 140
 141
 142 /**
 143  * Synchronous version of Lookup call
 144  *
 145  * @param mem_ctx memory context for the call
 146  * @param io arguments and results of the call
 147  * @return nt status code of execution
 148  */
 149
 150 NTSTATUS libnet_Lookup(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 151                        struct libnet_Lookup *io)
 152 {
 153         struct composite_context *c = libnet_Lookup_send(ctx, io);
 154         return libnet_Lookup_recv(c, mem_ctx, io);
 155 }
 156
 157
 158 /*
 159  * Shortcut functions to find common types of name
 160  * (and skip nbt name type argument)
 161  */
 162
 163
 164 /**
 165  * Sends asynchronous LookupHost request
 166  */
 167 struct composite_context* libnet_LookupHost_send(struct libnet_context *ctx,
 168                                                  struct libnet_Lookup *io)
 169 {
 170         io->in.type = NBT_NAME_SERVER;
 171         return libnet_Lookup_send(ctx, io);
 172 }
 173
 174
 175
 176 /**
 177  * Synchronous version of LookupHost call
 178  */
 179 NTSTATUS libnet_LookupHost(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 180                            struct libnet_Lookup *io)
 181 {
 182         struct composite_context *c = libnet_LookupHost_send(ctx, io);
 183         return libnet_Lookup_recv(c, mem_ctx, io);
 184 }
 185
 186
 187 /**
 188  * Sends asynchronous LookupDCs request
 189  */
 190 struct tevent_req *libnet_LookupDCs_send(struct libnet_context *ctx,
 191                                          TALLOC_CTX *mem_ctx,
 192                                          struct libnet_LookupDCs *io)
 193 {
 194         struct tevent_req *req;
 195         struct finddcs finddcs_io;
 196
 197         ZERO_STRUCT(finddcs_io);
 198         finddcs_io.in.domain_name = io->in.domain_name;
 199         finddcs_io.in.minimum_dc_flags = NBT_SERVER_LDAP | NBT_SERVER_DS | NBT_SERVER_WRITABLE;
 200         finddcs_io.in.server_address = ctx->server_address;
 201
 202         req = finddcs_cldap_send(mem_ctx, &finddcs_io, ctx->resolve_ctx, ctx->event_ctx);
 203         return req;
 204 }
 205
 206 /**
 207  * Waits for and receives results of asynchronous Lookup call
 208  *
 209  * @param c composite context returned by asynchronous Lookup call
 210  * @param mem_ctx memory context of the call
 211  * @param io pointer to results (and arguments) of the call
 212  * @return nt status code of execution
 213  */
 214
 215 NTSTATUS libnet_LookupDCs_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 216                                struct libnet_LookupDCs *io)
 217 {
 218         NTSTATUS status;
 219         struct finddcs finddcs_io;
 220         status = finddcs_cldap_recv(req, mem_ctx, &finddcs_io);
 221         talloc_free(req);
 222         io->out.num_dcs = 1;
 223         io->out.dcs = talloc(mem_ctx, struct nbt_dc_name);
 224         NT_STATUS_HAVE_NO_MEMORY(io->out.dcs);
 225         io->out.dcs[0].address = finddcs_io.out.address;
 226         io->out.dcs[0].name = finddcs_io.out.netlogon.data.nt5_ex.pdc_dns_name;
 227         return status;
 228 }
 229
 230
 231 /**
 232  * Synchronous version of LookupDCs
 233  */
 234 NTSTATUS libnet_LookupDCs(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 235                           struct libnet_LookupDCs *io)
 236 {
 237         struct tevent_req *req = libnet_LookupDCs_send(ctx, mem_ctx, io);
 238         return libnet_LookupDCs_recv(req, mem_ctx, io);
 239 }
 240
 241
 242 struct lookup_name_state {
 243         struct libnet_context *ctx;
 244         const char *name;
 245         uint32_t count;
 246         struct libnet_DomainOpen domopen;
 247         struct lsa_LookupNames lookup;
 248         struct lsa_TransSidArray sids;
 249         struct lsa_String *names;
 250
 251         /* information about the progress */
 252         void (*monitor_fn)(struct monitor_msg *);
 253 };
 254
 255
 256 static bool prepare_lookup_params(struct libnet_context *ctx,
 257                                   struct composite_context *c,
 258                                   struct lookup_name_state *s);
 259 static void continue_lookup_name(struct composite_context *ctx);
 260 static void continue_name_found(struct tevent_req *subreq);
 261
 262
 263 struct composite_context* libnet_LookupName_send(struct libnet_context *ctx,
 264                                                  TALLOC_CTX *mem_ctx,
 265                                                  struct libnet_LookupName *io,
 266                                                  void (*monitor)(struct monitor_msg*))
 267 {
 268         struct composite_context *c;
 269         struct lookup_name_state *s;
 270         struct tevent_req *subreq;
 271         bool prereq_met = false;
 272
 273         c = composite_create(mem_ctx, ctx->event_ctx);
 274         if (c == NULL) return NULL;
 275
 276         s = talloc_zero(c, struct lookup_name_state);
 277         if (composite_nomem(s, c)) return c;
 278
 279         c->private_data = s;
 280
 281         s->name = talloc_strdup(c, io->in.name);
 282         s->monitor_fn = monitor;
 283         s->ctx = ctx;
 284
 285         prereq_met = lsa_domain_opened(ctx, io->in.domain_name, &c, &s->domopen,
 286                                        continue_lookup_name, monitor);
 287         if (!prereq_met) return c;
 288
 289         if (!prepare_lookup_params(ctx, c, s)) return c;
 290
 291         subreq = dcerpc_lsa_LookupNames_r_send(s, c->event_ctx,
 292                                                ctx->lsa.pipe->binding_handle,
 293                                                &s->lookup);
 294         if (composite_nomem(subreq, c)) return c;
 295
 296         tevent_req_set_callback(subreq, continue_name_found, c);
 297         return c;
 298 }
 299
 300
 301 static bool prepare_lookup_params(struct libnet_context *ctx,
 302                                   struct composite_context *c,
 303                                   struct lookup_name_state *s)
 304 {
 305         const int single_name = 1;
 306
 307         s->sids.count = 0;
 308         s->sids.sids  = NULL;
 309
 310         s->names = talloc_array(ctx, struct lsa_String, single_name);
 311         if (composite_nomem(s->names, c)) return false;
 312         s->names[0].string = s->name;
 313
 314         s->lookup.in.handle    = &ctx->lsa.handle;
 315         s->lookup.in.num_names = single_name;
 316         s->lookup.in.names     = s->names;
 317         s->lookup.in.sids      = &s->sids;
 318         s->lookup.in.level     = 1;
 319         s->lookup.in.count     = &s->count;
 320         s->lookup.out.count    = &s->count;
 321         s->lookup.out.sids     = &s->sids;
 322         s->lookup.out.domains  = talloc_zero(ctx, struct lsa_RefDomainList *);
 323         if (composite_nomem(s->lookup.out.domains, c)) return false;
 324
 325         return true;
 326 }
 327
 328
 329 static void continue_lookup_name(struct composite_context *ctx)
 330 {
 331         struct composite_context *c;
 332         struct lookup_name_state *s;
 333         struct tevent_req *subreq;
 334
 335         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 336         s = talloc_get_type(c->private_data, struct lookup_name_state);
 337
 338         c->status = libnet_DomainOpen_recv(ctx, s->ctx, c, &s->domopen);
 339         if (!composite_is_ok(c)) return;
 340
 341         if (!prepare_lookup_params(s->ctx, c, s)) return;
 342
 343         subreq = dcerpc_lsa_LookupNames_r_send(s, c->event_ctx,
 344                                                s->ctx->lsa.pipe->binding_handle,
 345                                                &s->lookup);
 346         if (composite_nomem(subreq, c)) return;
 347
 348         tevent_req_set_callback(subreq, continue_name_found, c);
 349 }
 350
 351
 352 static void continue_name_found(struct tevent_req *subreq)
 353 {
 354         struct composite_context *c;
 355         struct lookup_name_state *s;
 356
 357         c = tevent_req_callback_data(subreq, struct composite_context);
 358         s = talloc_get_type(c->private_data, struct lookup_name_state);
 359
 360         c->status = dcerpc_lsa_LookupNames_r_recv(subreq, s);
 361         TALLOC_FREE(subreq);
 362         if (!composite_is_ok(c)) return;
 363
 364         c->status = s->lookup.out.result;
 365         if (!composite_is_ok(c)) return;
 366
 367         composite_done(c);
 368 }
 369
 370
 371 NTSTATUS libnet_LookupName_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 372                                 struct libnet_LookupName *io)
 373 {
 374         NTSTATUS status;
 375         struct lookup_name_state *s;
 376
 377         status = composite_wait(c);
 378
 379         if (NT_STATUS_IS_OK(status)) {
 380                 s = talloc_get_type(c->private_data, struct lookup_name_state);
 381
 382                 io->out.rid = 0;
 383                 io->out.sid = NULL;
 384                 io->out.sidstr = NULL;
 385
 386                 if (*s->lookup.out.count > 0) {
 387                         struct lsa_RefDomainList *domains = *s->lookup.out.domains;
 388                         struct lsa_TransSidArray *sids = s->lookup.out.sids;
 389
 390                         if (domains == NULL || sids == NULL) {
 391                                 status = NT_STATUS_UNSUCCESSFUL;
 392                                 io->out.error_string = talloc_asprintf(mem_ctx, "Error: %s", nt_errstr(status));
 393                                 goto done;
 394                         }
 395
 396                         if (sids->count > 0) {
 397                                 io->out.rid        = sids->sids[0].rid;
 398                                 io->out.sid_type   = sids->sids[0].sid_type;
 399                                 if (domains->count > 0) {
 400                                         io->out.sid = dom_sid_add_rid(mem_ctx, domains->domains[0].sid, io->out.rid);
 401                                         NT_STATUS_HAVE_NO_MEMORY(io->out.sid);
 402                                         io->out.sidstr = dom_sid_string(mem_ctx, io->out.sid);
 403                                         NT_STATUS_HAVE_NO_MEMORY(io->out.sidstr);
 404                                 }
 405                         }
 406                 }
 407
 408                 io->out.error_string = talloc_strdup(mem_ctx, "Success");
 409
 410         } else if (!NT_STATUS_IS_OK(status)) {
 411                 io->out.error_string = talloc_asprintf(mem_ctx, "Error: %s", nt_errstr(status));
 412         }
 413
 414 done:
 415         talloc_free(c);
 416         return status;
 417 }
 418
 419
 420 NTSTATUS libnet_LookupName(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 421                            struct libnet_LookupName *io)
 422 {
 423         struct composite_context *c;
 424
 425         c = libnet_LookupName_send(ctx, mem_ctx, io, NULL);
 426         return libnet_LookupName_recv(c, mem_ctx, io);
 427 }