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 "libnet/libnet.h"
  26 #include "libcli/composite/composite.h"
  27 #include "auth/credentials/credentials.h"
  28 #include "libcli/resolve/resolve.h"
  29 #include "libcli/finddc.h"
  30 #include "libcli/security/security.h"
  31 #include "librpc/gen_ndr/ndr_lsa_c.h"
  32 #include "param/param.h"
  33
  34 struct lookup_state {
  35         struct nbt_name hostname;
  36         const char *address;
  37 };
  38
  39
  40 static void continue_name_resolved(struct composite_context *ctx);
  41
  42
  43 /**
  44  * Sends asynchronous Lookup request
  45  *
  46  * @param io arguments and result of the call
  47  */
  48
  49 struct composite_context *libnet_Lookup_send(struct libnet_context *ctx,
  50                                              TALLOC_CTX *mem_ctx,
  51                                              struct libnet_Lookup *io)
  52 {
  53         struct composite_context *c;
  54         struct lookup_state *s;
  55         struct composite_context *cresolve_req;
  56         struct resolve_context *resolve_ctx;
  57
  58         /* allocate context and state structures */
  59         c = composite_create(mem_ctx, ctx->event_ctx);
  60         if (c == NULL) return NULL;
  61
  62         s = talloc_zero(c, struct lookup_state);
  63         if (composite_nomem(s, c)) return c;
  64
  65         c->private_data = s;
  66
  67         if (io == NULL || io->in.hostname == NULL) {
  68                 composite_error(c, NT_STATUS_INVALID_PARAMETER);
  69                 return c;
  70         }
  71
  72         /* parameters */
  73         s->hostname.name   = talloc_strdup(s, io->in.hostname);
  74         if (composite_nomem(s->hostname.name, c)) return c;
  75
  76         s->hostname.type   = io->in.type;
  77         s->hostname.scope  = NULL;
  78
  79         /* name resolution methods */
  80         if (io->in.resolve_ctx) {
  81                 resolve_ctx = io->in.resolve_ctx;
  82         } else {
  83                 resolve_ctx = ctx->resolve_ctx;
  84         }
  85
  86         /* send resolve request */
  87         cresolve_req = resolve_name_send(resolve_ctx, s, &s->hostname, c->event_ctx);
  88         if (composite_nomem(cresolve_req, c)) return c;
  89
  90         composite_continue(c, cresolve_req, continue_name_resolved, c);
  91         return c;
  92 }
  93
  94
  95 static void continue_name_resolved(struct composite_context *ctx)
  96 {
  97         struct composite_context *c;
  98         struct lookup_state *s;
  99
 100         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 101         s = talloc_get_type(c->private_data, struct lookup_state);
 102
 103         c->status = resolve_name_recv(ctx, s, &s->address);
 104
 105         composite_done(c);
 106 }
 107
 108
 109 /**
 110  * Waits for and receives results of asynchronous Lookup call
 111  *
 112  * @param c composite context returned by asynchronous Lookup call
 113  * @param mem_ctx memory context of the call
 114  * @param io pointer to results (and arguments) of the call
 115  * @return nt status code of execution
 116  */
 117
 118 NTSTATUS libnet_Lookup_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 119                             struct libnet_Lookup *io)
 120 {
 121         NTSTATUS status;
 122         struct lookup_state *s;
 123
 124         status = composite_wait(c);
 125         if (NT_STATUS_IS_OK(status)) {
 126                 char **address;
 127
 128                 s = talloc_get_type(c->private_data, struct lookup_state);
 129
 130                 address = str_list_make_single(mem_ctx, s->address);
 131                 NT_STATUS_HAVE_NO_MEMORY(address);
 132                 io->out.address = discard_const_p(const char *, address);
 133         }
 134
 135         talloc_free(c);
 136         return status;
 137 }
 138
 139
 140 /**
 141  * Synchronous version of Lookup call
 142  *
 143  * @param mem_ctx memory context for the call
 144  * @param io arguments and results of the call
 145  * @return nt status code of execution
 146  */
 147
 148 NTSTATUS libnet_Lookup(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 149                        struct libnet_Lookup *io)
 150 {
 151         struct composite_context *c = libnet_Lookup_send(ctx, mem_ctx, io);
 152         return libnet_Lookup_recv(c, mem_ctx, io);
 153 }
 154
 155
 156 /*
 157  * Shortcut functions to find common types of name
 158  * (and skip nbt name type argument)
 159  */
 160
 161
 162 /**
 163  * Sends asynchronous LookupHost request
 164  */
 165 struct composite_context* libnet_LookupHost_send(struct libnet_context *ctx,
 166                                                  TALLOC_CTX *mem_ctx,
 167                                                  struct libnet_Lookup *io)
 168 {
 169         io->in.type = NBT_NAME_SERVER;
 170         return libnet_Lookup_send(ctx, mem_ctx, io);
 171 }
 172
 173
 174
 175 /**
 176  * Synchronous version of LookupHost call
 177  */
 178 NTSTATUS libnet_LookupHost(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 179                            struct libnet_Lookup *io)
 180 {
 181         struct composite_context *c = libnet_LookupHost_send(ctx, mem_ctx, io);
 182         return libnet_Lookup_recv(c, mem_ctx, io);
 183 }
 184
 185
 186 /**
 187  * Sends asynchronous LookupDCs request
 188  */
 189 struct tevent_req *libnet_LookupDCs_send(struct libnet_context *ctx,
 190                                          TALLOC_CTX *mem_ctx,
 191                                          struct libnet_LookupDCs *io)
 192 {
 193         struct tevent_req *req;
 194         struct finddcs finddcs_io;
 195
 196         ZERO_STRUCT(finddcs_io);
 197
 198         if (strcasecmp_m(io->in.domain_name, lpcfg_workgroup(ctx->lp_ctx)) == 0) {
 199                 finddcs_io.in.domain_name = lpcfg_dnsdomain(ctx->lp_ctx);
 200         } else {
 201                 finddcs_io.in.domain_name = io->in.domain_name;
 202         }
 203         finddcs_io.in.minimum_dc_flags = NBT_SERVER_LDAP | NBT_SERVER_DS | NBT_SERVER_WRITABLE;
 204         finddcs_io.in.server_address = ctx->server_address;
 205
 206         req = finddcs_cldap_send(mem_ctx, &finddcs_io, ctx->resolve_ctx, ctx->event_ctx);
 207         return req;
 208 }
 209
 210 /**
 211  * Waits for and receives results of asynchronous Lookup call
 212  *
 213  * @param c composite context returned by asynchronous Lookup call
 214  * @param mem_ctx memory context of the call
 215  * @param io pointer to results (and arguments) of the call
 216  * @return nt status code of execution
 217  */
 218
 219 NTSTATUS libnet_LookupDCs_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 220                                struct libnet_LookupDCs *io)
 221 {
 222         NTSTATUS status;
 223         struct finddcs finddcs_io;
 224         status = finddcs_cldap_recv(req, mem_ctx, &finddcs_io);
 225         talloc_free(req);
 226         io->out.num_dcs = 1;
 227         io->out.dcs = talloc(mem_ctx, struct nbt_dc_name);
 228         NT_STATUS_HAVE_NO_MEMORY(io->out.dcs);
 229         io->out.dcs[0].address = finddcs_io.out.address;
 230         io->out.dcs[0].name = finddcs_io.out.netlogon.data.nt5_ex.pdc_dns_name;
 231         return status;
 232 }
 233
 234
 235 /**
 236  * Synchronous version of LookupDCs
 237  */
 238 NTSTATUS libnet_LookupDCs(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 239                           struct libnet_LookupDCs *io)
 240 {
 241         struct tevent_req *req = libnet_LookupDCs_send(ctx, mem_ctx, io);
 242         return libnet_LookupDCs_recv(req, mem_ctx, io);
 243 }
 244
 245
 246 struct lookup_name_state {
 247         struct libnet_context *ctx;
 248         const char *name;
 249         uint32_t count;
 250         struct libnet_DomainOpen domopen;
 251         struct lsa_LookupNames lookup;
 252         struct lsa_TransSidArray sids;
 253         struct lsa_String *names;
 254
 255         /* information about the progress */
 256         void (*monitor_fn)(struct monitor_msg *);
 257 };
 258
 259
 260 static bool prepare_lookup_params(struct libnet_context *ctx,
 261                                   struct composite_context *c,
 262                                   struct lookup_name_state *s);
 263 static void continue_lookup_name(struct composite_context *ctx);
 264 static void continue_name_found(struct tevent_req *subreq);
 265
 266
 267 struct composite_context* libnet_LookupName_send(struct libnet_context *ctx,
 268                                                  TALLOC_CTX *mem_ctx,
 269                                                  struct libnet_LookupName *io,
 270                                                  void (*monitor)(struct monitor_msg*))
 271 {
 272         struct composite_context *c;
 273         struct lookup_name_state *s;
 274         struct tevent_req *subreq;
 275         bool prereq_met = false;
 276
 277         c = composite_create(mem_ctx, ctx->event_ctx);
 278         if (c == NULL) return NULL;
 279
 280         s = talloc_zero(c, struct lookup_name_state);
 281         if (composite_nomem(s, c)) return c;
 282
 283         c->private_data = s;
 284
 285         s->name = talloc_strdup(c, io->in.name);
 286         s->monitor_fn = monitor;
 287         s->ctx = ctx;
 288
 289         prereq_met = lsa_domain_opened(ctx, c, io->in.domain_name, &c, &s->domopen,
 290                                        continue_lookup_name, monitor);
 291         if (!prereq_met) return c;
 292
 293         if (!prepare_lookup_params(ctx, c, s)) return c;
 294
 295         subreq = dcerpc_lsa_LookupNames_r_send(s, c->event_ctx,
 296                                                ctx->lsa.pipe->binding_handle,
 297                                                &s->lookup);
 298         if (composite_nomem(subreq, c)) return c;
 299
 300         tevent_req_set_callback(subreq, continue_name_found, c);
 301         return c;
 302 }
 303
 304
 305 static bool prepare_lookup_params(struct libnet_context *ctx,
 306                                   struct composite_context *c,
 307                                   struct lookup_name_state *s)
 308 {
 309         const int single_name = 1;
 310
 311         s->sids.count = 0;
 312         s->sids.sids  = NULL;
 313
 314         s->names = talloc_array(s, struct lsa_String, single_name);
 315         if (composite_nomem(s->names, c)) return false;
 316         s->names[0].string = s->name;
 317
 318         s->lookup.in.handle    = &ctx->lsa.handle;
 319         s->lookup.in.num_names = single_name;
 320         s->lookup.in.names     = s->names;
 321         s->lookup.in.sids      = &s->sids;
 322         s->lookup.in.level     = 1;
 323         s->lookup.in.count     = &s->count;
 324         s->lookup.out.count    = &s->count;
 325         s->lookup.out.sids     = &s->sids;
 326         s->lookup.out.domains  = talloc_zero(s, struct lsa_RefDomainList *);
 327         if (composite_nomem(s->lookup.out.domains, c)) return false;
 328
 329         return true;
 330 }
 331
 332
 333 static void continue_lookup_name(struct composite_context *ctx)
 334 {
 335         struct composite_context *c;
 336         struct lookup_name_state *s;
 337         struct tevent_req *subreq;
 338
 339         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 340         s = talloc_get_type(c->private_data, struct lookup_name_state);
 341
 342         c->status = libnet_DomainOpen_recv(ctx, s->ctx, c, &s->domopen);
 343         if (!composite_is_ok(c)) return;
 344
 345         if (!prepare_lookup_params(s->ctx, c, s)) return;
 346
 347         subreq = dcerpc_lsa_LookupNames_r_send(s, c->event_ctx,
 348                                                s->ctx->lsa.pipe->binding_handle,
 349                                                &s->lookup);
 350         if (composite_nomem(subreq, c)) return;
 351
 352         tevent_req_set_callback(subreq, continue_name_found, c);
 353 }
 354
 355
 356 static void continue_name_found(struct tevent_req *subreq)
 357 {
 358         struct composite_context *c;
 359         struct lookup_name_state *s;
 360
 361         c = tevent_req_callback_data(subreq, struct composite_context);
 362         s = talloc_get_type(c->private_data, struct lookup_name_state);
 363
 364         c->status = dcerpc_lsa_LookupNames_r_recv(subreq, s);
 365         TALLOC_FREE(subreq);
 366         if (!composite_is_ok(c)) return;
 367
 368         c->status = s->lookup.out.result;
 369         if (!composite_is_ok(c)) return;
 370
 371         if (s->lookup.out.sids->count != s->lookup.in.num_names) {
 372                 composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
 373                 return;
 374         }
 375
 376         composite_done(c);
 377 }
 378
 379
 380 NTSTATUS libnet_LookupName_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 381                                 struct libnet_LookupName *io)
 382 {
 383         NTSTATUS status;
 384         struct lookup_name_state *s = NULL;
 385         struct lsa_RefDomainList *domains = NULL;
 386         struct lsa_TransSidArray *sids = NULL;
 387
 388         status = composite_wait(c);
 389         ZERO_STRUCT(io->out);
 390
 391         if (!NT_STATUS_IS_OK(status)) {
 392                 io->out.error_string = talloc_asprintf(mem_ctx, "Error: %s",
 393                                                        nt_errstr(status));
 394                 goto done;
 395         }
 396
 397         s = talloc_get_type(c->private_data, struct lookup_name_state);
 398
 399         if (*s->lookup.out.count == 0) {
 400                 goto success;
 401         }
 402
 403         domains = *s->lookup.out.domains;
 404         sids = s->lookup.out.sids;
 405
 406         if (domains == NULL || sids == NULL) {
 407                 status = NT_STATUS_UNSUCCESSFUL;
 408                 io->out.error_string = talloc_asprintf(mem_ctx, "Error: %s",
 409                                                        nt_errstr(status));
 410                 goto done;
 411         }
 412
 413         if (sids->count == 0) {
 414                 goto success;
 415         }
 416
 417         io->out.rid        = sids->sids[0].rid;
 418         io->out.sid_type   = sids->sids[0].sid_type;
 419         if (domains->count > 0) {
 420                 io->out.sid = dom_sid_add_rid(mem_ctx, domains->domains[0].sid,
 421                                               io->out.rid);
 422                 if (io->out.sid == NULL) {
 423                         status = NT_STATUS_NO_MEMORY;
 424                         goto done;
 425                 }
 426                 io->out.sidstr = dom_sid_string(mem_ctx, io->out.sid);
 427                 if (io->out.sidstr == NULL) {
 428                         status = NT_STATUS_NO_MEMORY;
 429                         goto done;
 430                 }
 431         }
 432
 433 success:
 434         io->out.error_string = talloc_strdup(mem_ctx, "Success");
 435 done:
 436         talloc_free(c);
 437         return status;
 438 }
 439
 440
 441 NTSTATUS libnet_LookupName(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 442                            struct libnet_LookupName *io)
 443 {
 444         struct composite_context *c;
 445
 446         c = libnet_LookupName_send(ctx, mem_ctx, io, NULL);
 447         return libnet_LookupName_recv(c, mem_ctx, io);
 448 }