source3/libsmb/clisymlink.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Client implementation of setting symlinks using reparse points
   4  * Copyright (C) Volker Lendecke 2011
   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 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "libsmb/libsmb.h"
  23 #include "../lib/util/tevent_ntstatus.h"
  24 #include "async_smb.h"
  25 #include "libsmb/clirap.h"
  26 #include "trans2.h"
  27 #include "libcli/security/secdesc.h"
  28 #include "libcli/security/security.h"
  29 #include "../libcli/smb/smbXcli_base.h"
  30 #include "libcli/smb/reparse_symlink.h"
  31
  32 struct cli_symlink_state {
  33         struct tevent_context *ev;
  34         struct cli_state *cli;
  35         const char *link_target;
  36         const char *newpath;
  37         uint32_t flags;
  38
  39         uint16_t fnum;
  40
  41         uint16_t setup[4];
  42         NTSTATUS set_reparse_status;
  43 };
  44
  45 static void cli_symlink_create_done(struct tevent_req *subreq);
  46 static void cli_symlink_set_reparse_done(struct tevent_req *subreq);
  47 static void cli_symlink_delete_on_close_done(struct tevent_req *subreq);
  48 static void cli_symlink_close_done(struct tevent_req *subreq);
  49
  50 struct tevent_req *cli_symlink_send(TALLOC_CTX *mem_ctx,
  51                                     struct tevent_context *ev,
  52                                     struct cli_state *cli,
  53                                     const char *link_target,
  54                                     const char *newpath,
  55                                     uint32_t flags)
  56 {
  57         struct tevent_req *req, *subreq;
  58         struct cli_symlink_state *state;
  59
  60         req = tevent_req_create(mem_ctx, &state, struct cli_symlink_state);
  61         if (req == NULL) {
  62                 return NULL;
  63         }
  64         state->ev = ev;
  65         state->cli = cli;
  66         state->link_target = link_target;
  67         state->newpath = newpath;
  68         state->flags = flags;
  69
  70         subreq = cli_ntcreate_send(
  71                 state, ev, cli, state->newpath, 0,
  72                 SYNCHRONIZE_ACCESS|DELETE_ACCESS|
  73                 FILE_READ_ATTRIBUTES|FILE_WRITE_ATTRIBUTES,
  74                 FILE_ATTRIBUTE_NORMAL, FILE_SHARE_NONE, FILE_CREATE,
  75                 FILE_OPEN_REPARSE_POINT|FILE_SYNCHRONOUS_IO_NONALERT|
  76                 FILE_NON_DIRECTORY_FILE,
  77                 SMB2_IMPERSONATION_IMPERSONATION, 0);
  78         if (tevent_req_nomem(subreq, req)) {
  79                 return tevent_req_post(req, ev);
  80         }
  81         tevent_req_set_callback(subreq, cli_symlink_create_done, req);
  82         return req;
  83 }
  84
  85 static void cli_symlink_create_done(struct tevent_req *subreq)
  86 {
  87         struct tevent_req *req = tevent_req_callback_data(
  88                 subreq, struct tevent_req);
  89         struct cli_symlink_state *state = tevent_req_data(
  90                 req, struct cli_symlink_state);
  91         DATA_BLOB data;
  92         NTSTATUS status;
  93
  94         status = cli_ntcreate_recv(subreq, &state->fnum, NULL);
  95         TALLOC_FREE(subreq);
  96         if (tevent_req_nterror(req, status)) {
  97                 return;
  98         }
  99
 100         if (!symlink_reparse_buffer_marshall(
 101                     state->link_target, NULL, state->flags, state,
 102                     &data.data, &data.length)) {
 103                 tevent_req_oom(req);
 104                 return;
 105         }
 106
 107         if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
 108                 subreq = cli_smb2_set_reparse_point_fnum_send(state,
 109                                                 state->ev,
 110                                                 state->cli,
 111                                                 state->fnum,
 112                                                 data);
 113         } else {
 114                 SIVAL(state->setup, 0, FSCTL_SET_REPARSE_POINT);
 115                 SSVAL(state->setup, 4, state->fnum);
 116                 SCVAL(state->setup, 6, 1); /* IsFcntl */
 117                 SCVAL(state->setup, 7, 0); /* IsFlags */
 118
 119
 120                 subreq = cli_trans_send(state, state->ev, state->cli, 0,
 121                                 SMBnttrans,
 122                                 NULL, -1, /* name, fid */
 123                                 NT_TRANSACT_IOCTL, 0,
 124                                 state->setup, 4, 0, /* setup */
 125                                 NULL, 0, 0,         /* param */
 126                                 data.data, data.length, 0); /* data */
 127         }
 128
 129         if (tevent_req_nomem(subreq, req)) {
 130                 return;
 131         }
 132         tevent_req_set_callback(subreq, cli_symlink_set_reparse_done, req);
 133 }
 134
 135 static void cli_symlink_set_reparse_done(struct tevent_req *subreq)
 136 {
 137         struct tevent_req *req = tevent_req_callback_data(
 138                 subreq, struct tevent_req);
 139         struct cli_symlink_state *state = tevent_req_data(
 140                 req, struct cli_symlink_state);
 141
 142         if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
 143                 state->set_reparse_status =
 144                         cli_smb2_set_reparse_point_fnum_recv(subreq);
 145         } else {
 146                 state->set_reparse_status = cli_trans_recv(
 147                         subreq, NULL, NULL,
 148                         NULL, 0, NULL,  /* rsetup */
 149                         NULL, 0, NULL,  /* rparam */
 150                         NULL, 0, NULL); /* rdata */
 151         }
 152         TALLOC_FREE(subreq);
 153
 154         if (NT_STATUS_IS_OK(state->set_reparse_status)) {
 155                 subreq = cli_close_send(state, state->ev, state->cli,
 156                                         state->fnum);
 157                 if (tevent_req_nomem(subreq, req)) {
 158                         return;
 159                 }
 160                 tevent_req_set_callback(subreq, cli_symlink_close_done, req);
 161                 return;
 162         }
 163         subreq = cli_nt_delete_on_close_send(
 164                 state, state->ev, state->cli, state->fnum, true);
 165         if (tevent_req_nomem(subreq, req)) {
 166                 return;
 167         }
 168         tevent_req_set_callback(subreq, cli_symlink_delete_on_close_done, req);
 169 }
 170
 171 static void cli_symlink_delete_on_close_done(struct tevent_req *subreq)
 172 {
 173         struct tevent_req *req = tevent_req_callback_data(
 174                 subreq, struct tevent_req);
 175         struct cli_symlink_state *state = tevent_req_data(
 176                 req, struct cli_symlink_state);
 177
 178         /*
 179          * Ignore status, we can't do much anyway in case of failure
 180          */
 181
 182         (void)cli_nt_delete_on_close_recv(subreq);
 183         TALLOC_FREE(subreq);
 184
 185         subreq = cli_close_send(state, state->ev, state->cli, state->fnum);
 186         if (tevent_req_nomem(subreq, req)) {
 187                 return;
 188         }
 189         tevent_req_set_callback(subreq, cli_symlink_close_done, req);
 190 }
 191
 192 static void cli_symlink_close_done(struct tevent_req *subreq)
 193 {
 194         struct tevent_req *req = tevent_req_callback_data(
 195                 subreq, struct tevent_req);
 196         struct cli_symlink_state *state = tevent_req_data(
 197                 req, struct cli_symlink_state);
 198         NTSTATUS status;
 199
 200         status = cli_close_recv(subreq);
 201         TALLOC_FREE(subreq);
 202
 203         if (tevent_req_nterror(req, status)) {
 204                 return;
 205         }
 206         if (tevent_req_nterror(req, state->set_reparse_status)) {
 207                 return;
 208         }
 209         tevent_req_done(req);
 210 }
 211
 212 NTSTATUS cli_symlink_recv(struct tevent_req *req)
 213 {
 214         return tevent_req_simple_recv_ntstatus(req);
 215 }
 216
 217 NTSTATUS cli_symlink(struct cli_state *cli, const char *link_target,
 218                      const char *newname, uint32_t flags)
 219 {
 220         TALLOC_CTX *frame = talloc_stackframe();
 221         struct tevent_context *ev;
 222         struct tevent_req *req;
 223         NTSTATUS status = NT_STATUS_NO_MEMORY;
 224
 225         if (smbXcli_conn_has_async_calls(cli->conn)) {
 226                 status = NT_STATUS_INVALID_PARAMETER;
 227                 goto fail;
 228         }
 229         ev = samba_tevent_context_init(frame);
 230         if (ev == NULL) {
 231                 goto fail;
 232         }
 233         req = cli_symlink_send(frame, ev, cli, link_target, newname, flags);
 234         if (req == NULL) {
 235                 goto fail;
 236         }
 237         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 238                 goto fail;
 239         }
 240         status = cli_symlink_recv(req);
 241  fail:
 242         TALLOC_FREE(frame);
 243         return status;
 244 }
 245
 246 struct cli_readlink_state {
 247         struct tevent_context *ev;
 248         struct cli_state *cli;
 249         uint16_t fnum;
 250
 251         uint16_t setup[4];
 252         NTSTATUS get_reparse_status;
 253         uint8_t *data;
 254         uint32_t num_data;
 255 };
 256
 257 static void cli_readlink_opened(struct tevent_req *subreq);
 258 static void cli_readlink_got_reparse_data(struct tevent_req *subreq);
 259 static void cli_readlink_closed(struct tevent_req *subreq);
 260
 261 struct tevent_req *cli_readlink_send(TALLOC_CTX *mem_ctx,
 262                                      struct tevent_context *ev,
 263                                      struct cli_state *cli,
 264                                      const char *fname)
 265 {
 266         struct tevent_req *req, *subreq;
 267         struct cli_readlink_state *state;
 268
 269         req = tevent_req_create(mem_ctx, &state, struct cli_readlink_state);
 270         if (req == NULL) {
 271                 return NULL;
 272         }
 273         state->ev = ev;
 274         state->cli = cli;
 275
 276         subreq = cli_ntcreate_send(
 277                 state, ev, cli, fname, 0, FILE_READ_ATTRIBUTES | FILE_READ_EA,
 278                 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 279                 FILE_OPEN, FILE_OPEN_REPARSE_POINT,
 280                 SMB2_IMPERSONATION_IMPERSONATION, 0);
 281         if (tevent_req_nomem(subreq, req)) {
 282                 return tevent_req_post(req, ev);
 283         }
 284         tevent_req_set_callback(subreq, cli_readlink_opened, req);
 285         return req;
 286 }
 287
 288 static void cli_readlink_opened(struct tevent_req *subreq)
 289 {
 290         struct tevent_req *req = tevent_req_callback_data(
 291                 subreq, struct tevent_req);
 292         struct cli_readlink_state *state = tevent_req_data(
 293                 req, struct cli_readlink_state);
 294         NTSTATUS status;
 295
 296         status = cli_ntcreate_recv(subreq, &state->fnum, NULL);
 297         TALLOC_FREE(subreq);
 298         if (tevent_req_nterror(req, status)) {
 299                 return;
 300         }
 301
 302         if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
 303                 subreq = cli_smb2_get_reparse_point_fnum_send(state,
 304                                                 state->ev,
 305                                                 state->cli,
 306                                                 state->fnum);
 307         } else {
 308                 SIVAL(state->setup, 0, FSCTL_GET_REPARSE_POINT);
 309                 SSVAL(state->setup, 4, state->fnum);
 310                 SCVAL(state->setup, 6, 1); /* IsFcntl */
 311                 SCVAL(state->setup, 7, 0); /* IsFlags */
 312
 313                 subreq = cli_trans_send(state, state->ev, state->cli,
 314                                 0, SMBnttrans,
 315                                 NULL, -1, /* name, fid */
 316                                 NT_TRANSACT_IOCTL, 0,
 317                                 state->setup, 4, 0, /* setup */
 318                                 NULL, 0, 0,         /* param */
 319                                 NULL, 0, 16384); /* data */
 320         }
 321
 322         if (tevent_req_nomem(subreq, req)) {
 323                 return;
 324         }
 325         tevent_req_set_callback(subreq, cli_readlink_got_reparse_data, req);
 326 }
 327
 328 static void cli_readlink_got_reparse_data(struct tevent_req *subreq)
 329 {
 330         struct tevent_req *req = tevent_req_callback_data(
 331                 subreq, struct tevent_req);
 332         struct cli_readlink_state *state = tevent_req_data(
 333                 req, struct cli_readlink_state);
 334
 335         if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
 336                 DATA_BLOB recv_data;
 337                 state->get_reparse_status =
 338                         cli_smb2_get_reparse_point_fnum_recv(subreq,
 339                                                         state,
 340                                                         &recv_data);
 341                 if (NT_STATUS_IS_OK(state->get_reparse_status)) {
 342                         state->data = recv_data.data;
 343                         state->num_data = recv_data.length;
 344                 }
 345         } else {
 346                 state->get_reparse_status = cli_trans_recv(
 347                         subreq, state, NULL,
 348                         NULL, 0, NULL,  /* rsetup */
 349                         NULL, 0, NULL,  /* rparam */
 350                         &state->data, 20, &state->num_data); /* rdata */
 351         }
 352         TALLOC_FREE(subreq);
 353
 354         subreq = cli_close_send(state, state->ev, state->cli, state->fnum);
 355         if (tevent_req_nomem(subreq, req)) {
 356                 return;
 357         }
 358         tevent_req_set_callback(subreq, cli_readlink_closed, req);
 359 }
 360
 361 static void cli_readlink_closed(struct tevent_req *subreq)
 362 {
 363         struct tevent_req *req = tevent_req_callback_data(
 364                 subreq, struct tevent_req);
 365         NTSTATUS status;
 366
 367         status = cli_close_recv(subreq);
 368         TALLOC_FREE(subreq);
 369         if (tevent_req_nterror(req, status)) {
 370                 return;
 371         }
 372         tevent_req_done(req);
 373 }
 374
 375 NTSTATUS cli_readlink_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 376                            char **psubstitute_name, char **pprint_name,
 377                            uint32_t *pflags)
 378 {
 379         struct cli_readlink_state *state = tevent_req_data(
 380                 req, struct cli_readlink_state);
 381         struct symlink_reparse_struct *symlink = NULL;
 382         NTSTATUS status;
 383
 384         if (tevent_req_is_nterror(req, &status)) {
 385                 return status;
 386         }
 387
 388         symlink = symlink_reparse_buffer_parse(
 389                 talloc_tos(), state->data, state->num_data);
 390         if (symlink == NULL) {
 391                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 392         }
 393
 394         if (psubstitute_name != NULL) {
 395                 *psubstitute_name = talloc_move(
 396                         mem_ctx, &symlink->substitute_name);
 397         }
 398
 399         if (pprint_name != NULL) {
 400                 *pprint_name = talloc_move(mem_ctx, &symlink->print_name);
 401         }
 402
 403         if (pflags != NULL) {
 404                 *pflags = symlink->flags;
 405         }
 406
 407         TALLOC_FREE(symlink);
 408
 409         return NT_STATUS_OK;
 410 }
 411
 412 NTSTATUS cli_readlink(struct cli_state *cli, const char *fname,
 413                        TALLOC_CTX *mem_ctx, char **psubstitute_name,
 414                       char **pprint_name, uint32_t *pflags)
 415 {
 416         TALLOC_CTX *frame = talloc_stackframe();
 417         struct tevent_context *ev;
 418         struct tevent_req *req;
 419         NTSTATUS status = NT_STATUS_NO_MEMORY;
 420
 421         if (smbXcli_conn_has_async_calls(cli->conn)) {
 422                 status = NT_STATUS_INVALID_PARAMETER;
 423                 goto fail;
 424         }
 425         ev = samba_tevent_context_init(frame);
 426         if (ev == NULL) {
 427                 goto fail;
 428         }
 429         req = cli_readlink_send(frame, ev, cli, fname);
 430         if (req == NULL) {
 431                 goto fail;
 432         }
 433         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 434                 goto fail;
 435         }
 436         status = cli_readlink_recv(req, mem_ctx, psubstitute_name,
 437                                    pprint_name, pflags);
 438  fail:
 439         TALLOC_FREE(frame);
 440         return status;
 441 }