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