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