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                 s = talloc_get_type(c->private_data, struct lookup_state);
 127
 128                 io->out.address = (const char **)str_list_make_single(mem_ctx, s->address);
 129                 NT_STATUS_HAVE_NO_MEMORY(io->out.address);
 130         }
 131
 132         talloc_free(c);
 133         return status;
 134 }
 135
 136
 137 /**
 138  * Synchronous version of Lookup call
 139  *
 140  * @param mem_ctx memory context for the call
 141  * @param io arguments and results of the call
 142  * @return nt status code of execution
 143  */
 144
 145 NTSTATUS libnet_Lookup(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 146                        struct libnet_Lookup *io)
 147 {
 148         struct composite_context *c = libnet_Lookup_send(ctx, mem_ctx, io);
 149         return libnet_Lookup_recv(c, mem_ctx, io);
 150 }
 151
 152
 153 /*
 154  * Shortcut functions to find common types of name
 155  * (and skip nbt name type argument)
 156  */
 157
 158
 159 /**
 160  * Sends asynchronous LookupHost request
 161  */
 162 struct composite_context* libnet_LookupHost_send(struct libnet_context *ctx,
 163                                                  TALLOC_CTX *mem_ctx,
 164                                                  struct libnet_Lookup *io)
 165 {
 166         io->in.type = NBT_NAME_SERVER;
 167         return libnet_Lookup_send(ctx, mem_ctx, io);
 168 }
 169
 170
 171
 172 /**
 173  * Synchronous version of LookupHost call
 174  */
 175 NTSTATUS libnet_LookupHost(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 176                            struct libnet_Lookup *io)
 177 {
 178         struct composite_context *c = libnet_LookupHost_send(ctx, mem_ctx, io);
 179         return libnet_Lookup_recv(c, mem_ctx, io);
 180 }
 181
 182
 183 /**
 184  * Sends asynchronous LookupDCs request
 185  */
 186 struct tevent_req *libnet_LookupDCs_send(struct libnet_context *ctx,
 187                                          TALLOC_CTX *mem_ctx,
 188                                          struct libnet_LookupDCs *io)
 189 {
 190         struct tevent_req *req;
 191         struct finddcs finddcs_io;
 192
 193         ZERO_STRUCT(finddcs_io);
 194
 195         if (strcasecmp_m(io->in.domain_name, lpcfg_workgroup(ctx->lp_ctx)) == 0) {
 196                 finddcs_io.in.domain_name = lpcfg_dnsdomain(ctx->lp_ctx);
 197         } else {
 198                 finddcs_io.in.domain_name = io->in.domain_name;
 199         }
 200         finddcs_io.in.minimum_dc_flags = NBT_SERVER_LDAP | NBT_SERVER_DS | NBT_SERVER_WRITABLE;
 201         finddcs_io.in.server_address = ctx->server_address;
 202
 203         req = finddcs_cldap_send(mem_ctx, &finddcs_io, ctx->resolve_ctx, ctx->event_ctx);
 204         return req;
 205 }
 206
 207 /**
 208  * Waits for and receives results of asynchronous Lookup call
 209  *
 210  * @param c composite context returned by asynchronous Lookup call
 211  * @param mem_ctx memory context of the call
 212  * @param io pointer to results (and arguments) of the call
 213  * @return nt status code of execution
 214  */
 215
 216 NTSTATUS libnet_LookupDCs_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 217                                struct libnet_LookupDCs *io)
 218 {
 219         NTSTATUS status;
 220         struct finddcs finddcs_io;
 221         status = finddcs_cldap_recv(req, mem_ctx, &finddcs_io);
 222         talloc_free(req);
 223         io->out.num_dcs = 1;
 224         io->out.dcs = talloc(mem_ctx, struct nbt_dc_name);
 225         NT_STATUS_HAVE_NO_MEMORY(io->out.dcs);
 226         io->out.dcs[0].address = finddcs_io.out.address;
 227         io->out.dcs[0].name = finddcs_io.out.netlogon.data.nt5_ex.pdc_dns_name;
 228         return status;
 229 }
 230
 231
 232 /**
 233  * Synchronous version of LookupDCs
 234  */
 235 NTSTATUS libnet_LookupDCs(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 236                           struct libnet_LookupDCs *io)
 237 {
 238         struct tevent_req *req = libnet_LookupDCs_send(ctx, mem_ctx, io);
 239         return libnet_LookupDCs_recv(req, mem_ctx, io);
 240 }
 241
 242
 243 struct lookup_name_state {
 244         struct libnet_context *ctx;
 245         const char *name;
 246         uint32_t count;
 247         struct libnet_DomainOpen domopen;
 248         struct lsa_LookupNames lookup;
 249         struct lsa_TransSidArray sids;
 250         struct lsa_String *names;
 251
 252         /* information about the progress */
 253         void (*monitor_fn)(struct monitor_msg *);
 254 };
 255
 256
 257 static bool prepare_lookup_params(struct libnet_context *ctx,
 258                                   struct composite_context *c,
 259                                   struct lookup_name_state *s);
 260 static void continue_lookup_name(struct composite_context *ctx);
 261 static void continue_name_found(struct tevent_req *subreq);
 262
 263
 264 struct composite_context* libnet_LookupName_send(struct libnet_context *ctx,
 265                                                  TALLOC_CTX *mem_ctx,
 266                                                  struct libnet_LookupName *io,
 267                                                  void (*monitor)(struct monitor_msg*))
 268 {
 269         struct composite_context *c;
 270         struct lookup_name_state *s;
 271         struct tevent_req *subreq;
 272         bool prereq_met = false;
 273
 274         c = composite_create(mem_ctx, ctx->event_ctx);
 275         if (c == NULL) return NULL;
 276
 277         s = talloc_zero(c, struct lookup_name_state);
 278         if (composite_nomem(s, c)) return c;
 279
 280         c->private_data = s;
 281
 282         s->name = talloc_strdup(c, io->in.name);
 283         s->monitor_fn = monitor;
 284         s->ctx = ctx;
 285
 286         prereq_met = lsa_domain_opened(ctx, c, io->in.domain_name, &c, &s->domopen,
 287                                        continue_lookup_name, monitor);
 288         if (!prereq_met) return c;
 289
 290         if (!prepare_lookup_params(ctx, c, s)) return c;
 291
 292         subreq = dcerpc_lsa_LookupNames_r_send(s, c->event_ctx,
 293                                                ctx->lsa.pipe->binding_handle,
 294                                                &s->lookup);
 295         if (composite_nomem(subreq, c)) return c;
 296
 297         tevent_req_set_callback(subreq, continue_name_found, c);
 298         return c;
 299 }
 300
 301
 302 static bool prepare_lookup_params(struct libnet_context *ctx,
 303                                   struct composite_context *c,
 304                                   struct lookup_name_state *s)
 305 {
 306         const int single_name = 1;
 307
 308         s->sids.count = 0;
 309         s->sids.sids  = NULL;
 310
 311         s->names = talloc_array(s, struct lsa_String, single_name);
 312         if (composite_nomem(s->names, c)) return false;
 313         s->names[0].string = s->name;
 314
 315         s->lookup.in.handle    = &ctx->lsa.handle;
 316         s->lookup.in.num_names = single_name;
 317         s->lookup.in.names     = s->names;
 318         s->lookup.in.sids      = &s->sids;
 319         s->lookup.in.level     = 1;
 320         s->lookup.in.count     = &s->count;
 321         s->lookup.out.count    = &s->count;
 322         s->lookup.out.sids     = &s->sids;
 323         s->lookup.out.domains  = talloc_zero(s, struct lsa_RefDomainList *);
 324         if (composite_nomem(s->lookup.out.domains, c)) return false;
 325
 326         return true;
 327 }
 328
 329
 330 static void continue_lookup_name(struct composite_context *ctx)
 331 {
 332         struct composite_context *c;
 333         struct lookup_name_state *s;
 334         struct tevent_req *subreq;
 335
 336         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 337         s = talloc_get_type(c->private_data, struct lookup_name_state);
 338
 339         c->status = libnet_DomainOpen_recv(ctx, s->ctx, c, &s->domopen);
 340         if (!composite_is_ok(c)) return;
 341
 342         if (!prepare_lookup_params(s->ctx, c, s)) return;
 343
 344         subreq = dcerpc_lsa_LookupNames_r_send(s, c->event_ctx,
 345                                                s->ctx->lsa.pipe->binding_handle,
 346                                                &s->lookup);
 347         if (composite_nomem(subreq, c)) return;
 348
 349         tevent_req_set_callback(subreq, continue_name_found, c);
 350 }
 351
 352
 353 static void continue_name_found(struct tevent_req *subreq)
 354 {
 355         struct composite_context *c;
 356         struct lookup_name_state *s;
 357
 358         c = tevent_req_callback_data(subreq, struct composite_context);
 359         s = talloc_get_type(c->private_data, struct lookup_name_state);
 360
 361         c->status = dcerpc_lsa_LookupNames_r_recv(subreq, s);
 362         TALLOC_FREE(subreq);
 363         if (!composite_is_ok(c)) return;
 364
 365         c->status = s->lookup.out.result;
 366         if (!composite_is_ok(c)) return;
 367
 368         if (s->lookup.out.sids->count != s->lookup.in.num_names) {
 369                 composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
 370                 return;
 371         }
 372
 373         composite_done(c);
 374 }
 375
 376
 377 NTSTATUS libnet_LookupName_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 378                                 struct libnet_LookupName *io)
 379 {
 380         NTSTATUS status;
 381         struct lookup_name_state *s;
 382
 383         status = composite_wait(c);
 384
 385         if (NT_STATUS_IS_OK(status)) {
 386                 s = talloc_get_type(c->private_data, struct lookup_name_state);
 387
 388                 io->out.rid = 0;
 389                 io->out.sid = NULL;
 390                 io->out.sidstr = NULL;
 391
 392                 if (*s->lookup.out.count > 0) {
 393                         struct lsa_RefDomainList *domains = *s->lookup.out.domains;
 394                         struct lsa_TransSidArray *sids = s->lookup.out.sids;
 395
 396                         if (domains == NULL || sids == NULL) {
 397                                 status = NT_STATUS_UNSUCCESSFUL;
 398                                 io->out.error_string = talloc_asprintf(mem_ctx, "Error: %s", nt_errstr(status));
 399                                 goto done;
 400                         }
 401
 402                         if (sids->count > 0) {
 403                                 io->out.rid        = sids->sids[0].rid;
 404                                 io->out.sid_type   = sids->sids[0].sid_type;
 405                                 if (domains->count > 0) {
 406                                         io->out.sid = dom_sid_add_rid(mem_ctx, domains->domains[0].sid, io->out.rid);
 407                                         NT_STATUS_HAVE_NO_MEMORY(io->out.sid);
 408                                         io->out.sidstr = dom_sid_string(mem_ctx, io->out.sid);
 409                                         NT_STATUS_HAVE_NO_MEMORY(io->out.sidstr);
 410                                 }
 411                         }
 412                 }
 413
 414                 io->out.error_string = talloc_strdup(mem_ctx, "Success");
 415
 416         } else if (!NT_STATUS_IS_OK(status)) {
 417                 io->out.error_string = talloc_asprintf(mem_ctx, "Error: %s", nt_errstr(status));
 418         }
 419
 420 done:
 421         talloc_free(c);
 422         return status;
 423 }
 424
 425
 426 NTSTATUS libnet_LookupName(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 427                            struct libnet_LookupName *io)
 428 {
 429         struct composite_context *c;
 430
 431         c = libnet_LookupName_send(ctx, mem_ctx, io, NULL);
 432         return libnet_LookupName_recv(c, mem_ctx, io);
 433 }