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 "ntioctl.h"
  28 #include "libcli/security/secdesc.h"
  29 #include "libcli/security/security.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         NTSTATUS status;
 161
 162         status = cli_nt_delete_on_close_recv(subreq);
 163         TALLOC_FREE(subreq);
 164
 165         /*
 166          * Ignore status, we can't do much anyway in case of failure
 167          */
 168
 169         subreq = cli_close_send(state, state->ev, state->cli, state->fnum);
 170         if (tevent_req_nomem(subreq, req)) {
 171                 return;
 172         }
 173         tevent_req_set_callback(subreq, cli_symlink_close_done, req);
 174 }
 175
 176 static void cli_symlink_close_done(struct tevent_req *subreq)
 177 {
 178         struct tevent_req *req = tevent_req_callback_data(
 179                 subreq, struct tevent_req);
 180         struct cli_symlink_state *state = tevent_req_data(
 181                 req, struct cli_symlink_state);
 182         NTSTATUS status;
 183
 184         status = cli_close_recv(subreq);
 185         TALLOC_FREE(subreq);
 186
 187         if (tevent_req_nterror(req, status)) {
 188                 return;
 189         }
 190         if (tevent_req_nterror(req, state->set_reparse_status)) {
 191                 return;
 192         }
 193         tevent_req_done(req);
 194 }
 195
 196 NTSTATUS cli_symlink_recv(struct tevent_req *req)
 197 {
 198         return tevent_req_simple_recv_ntstatus(req);
 199 }
 200
 201 NTSTATUS cli_symlink(struct cli_state *cli, const char *oldname,
 202                      const char *newname, uint32_t flags)
 203 {
 204         TALLOC_CTX *frame = talloc_stackframe();
 205         struct event_context *ev;
 206         struct tevent_req *req;
 207         NTSTATUS status = NT_STATUS_NO_MEMORY;
 208
 209         if (cli_has_async_calls(cli)) {
 210                 status = NT_STATUS_INVALID_PARAMETER;
 211                 goto fail;
 212         }
 213         ev = event_context_init(frame);
 214         if (ev == NULL) {
 215                 goto fail;
 216         }
 217         req = cli_symlink_send(frame, ev, cli, oldname, newname, flags);
 218         if (req == NULL) {
 219                 goto fail;
 220         }
 221         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 222                 goto fail;
 223         }
 224         status = cli_symlink_recv(req);
 225  fail:
 226         TALLOC_FREE(frame);
 227         return status;
 228 }
 229
 230 struct cli_readlink_state {
 231         struct tevent_context *ev;
 232         struct cli_state *cli;
 233         uint16_t fnum;
 234
 235         uint16_t setup[4];
 236         NTSTATUS get_reparse_status;
 237         uint8_t *data;
 238         uint32_t num_data;
 239 };
 240
 241 static void cli_readlink_opened(struct tevent_req *subreq);
 242 static void cli_readlink_got_reparse_data(struct tevent_req *subreq);
 243 static void cli_readlink_closed(struct tevent_req *subreq);
 244
 245 struct tevent_req *cli_readlink_send(TALLOC_CTX *mem_ctx,
 246                                      struct tevent_context *ev,
 247                                      struct cli_state *cli,
 248                                      const char *fname)
 249 {
 250         struct tevent_req *req, *subreq;
 251         struct cli_readlink_state *state;
 252
 253         req = tevent_req_create(mem_ctx, &state, struct cli_readlink_state);
 254         if (req == NULL) {
 255                 return NULL;
 256         }
 257         state->ev = ev;
 258         state->cli = cli;
 259
 260         subreq = cli_ntcreate_send(
 261                 state, ev, cli, fname, 0, FILE_READ_ATTRIBUTES | FILE_READ_EA,
 262                 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 263                 FILE_OPEN, FILE_OPEN_REPARSE_POINT, 0);
 264         if (tevent_req_nomem(subreq, req)) {
 265                 return tevent_req_post(req, ev);
 266         }
 267         tevent_req_set_callback(subreq, cli_readlink_opened, req);
 268         return req;
 269 }
 270
 271 static void cli_readlink_opened(struct tevent_req *subreq)
 272 {
 273         struct tevent_req *req = tevent_req_callback_data(
 274                 subreq, struct tevent_req);
 275         struct cli_readlink_state *state = tevent_req_data(
 276                 req, struct cli_readlink_state);
 277         NTSTATUS status;
 278
 279         status = cli_ntcreate_recv(subreq, &state->fnum);
 280         TALLOC_FREE(subreq);
 281         if (tevent_req_nterror(req, status)) {
 282                 return;
 283         }
 284
 285         SIVAL(state->setup, 0, FSCTL_GET_REPARSE_POINT);
 286         SSVAL(state->setup, 4, state->fnum);
 287         SCVAL(state->setup, 6, 1); /* IsFcntl */
 288         SCVAL(state->setup, 7, 0); /* IsFlags */
 289
 290         subreq = cli_trans_send(state, state->ev, state->cli, SMBnttrans,
 291                                 NULL, -1, /* name, fid */
 292                                 NT_TRANSACT_IOCTL, 0,
 293                                 state->setup, 4, 0, /* setup */
 294                                 NULL, 0, 0,         /* param */
 295                                 NULL, 0, 16384); /* data */
 296         if (tevent_req_nomem(subreq, req)) {
 297                 return;
 298         }
 299         tevent_req_set_callback(subreq, cli_readlink_got_reparse_data, req);
 300 }
 301
 302 static void cli_readlink_got_reparse_data(struct tevent_req *subreq)
 303 {
 304         struct tevent_req *req = tevent_req_callback_data(
 305                 subreq, struct tevent_req);
 306         struct cli_readlink_state *state = tevent_req_data(
 307                 req, struct cli_readlink_state);
 308
 309         state->get_reparse_status = cli_trans_recv(
 310                 subreq, state, NULL,
 311                 NULL, 0, NULL,  /* rsetup */
 312                 NULL, 0, NULL,  /* rparam */
 313                 &state->data, 20, &state->num_data); /* rdata */
 314         TALLOC_FREE(subreq);
 315
 316         subreq = cli_close_send(state, state->ev, state->cli, state->fnum);
 317         if (tevent_req_nomem(subreq, req)) {
 318                 return;
 319         }
 320         tevent_req_set_callback(subreq, cli_readlink_closed, req);
 321 }
 322
 323 static void cli_readlink_closed(struct tevent_req *subreq)
 324 {
 325         struct tevent_req *req = tevent_req_callback_data(
 326                 subreq, struct tevent_req);
 327         NTSTATUS status;
 328
 329         status = cli_close_recv(subreq);
 330         TALLOC_FREE(subreq);
 331         if (tevent_req_nterror(req, status)) {
 332                 return;
 333         }
 334         tevent_req_done(req);
 335 }
 336
 337 NTSTATUS cli_readlink_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 338                            char **psubstitute_name, char **pprint_name,
 339                            uint32_t *pflags)
 340 {
 341         struct cli_readlink_state *state = tevent_req_data(
 342                 req, struct cli_readlink_state);
 343         NTSTATUS status;
 344         char *substitute_name;
 345         char *print_name;
 346         uint32_t flags;
 347
 348         if (tevent_req_is_nterror(req, &status)) {
 349                 return status;
 350         }
 351
 352         if (!symlink_reparse_buffer_parse(state->data, state->num_data,
 353                                           talloc_tos(), &substitute_name,
 354                                           &print_name, &flags)) {
 355                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 356         }
 357
 358         if (psubstitute_name != NULL) {
 359                 *psubstitute_name = talloc_move(mem_ctx, &substitute_name);
 360         }
 361         TALLOC_FREE(substitute_name);
 362
 363         if (pprint_name != NULL) {
 364                 *pprint_name = talloc_move(mem_ctx, &print_name);
 365         }
 366         TALLOC_FREE(print_name);
 367
 368         if (pflags != NULL) {
 369                 *pflags = flags;
 370         }
 371         return NT_STATUS_OK;
 372 }
 373
 374 NTSTATUS cli_readlink(struct cli_state *cli, const char *fname,
 375                        TALLOC_CTX *mem_ctx, char **psubstitute_name,
 376                       char **pprint_name, uint32_t *pflags)
 377 {
 378         TALLOC_CTX *frame = talloc_stackframe();
 379         struct event_context *ev;
 380         struct tevent_req *req;
 381         NTSTATUS status = NT_STATUS_NO_MEMORY;
 382
 383         if (cli_has_async_calls(cli)) {
 384                 status = NT_STATUS_INVALID_PARAMETER;
 385                 goto fail;
 386         }
 387         ev = event_context_init(frame);
 388         if (ev == NULL) {
 389                 goto fail;
 390         }
 391         req = cli_readlink_send(frame, ev, cli, fname);
 392         if (req == NULL) {
 393                 goto fail;
 394         }
 395         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 396                 goto fail;
 397         }
 398         status = cli_readlink_recv(req, mem_ctx, psubstitute_name,
 399                                    pprint_name, pflags);
 400  fail:
 401         TALLOC_FREE(frame);
 402         return status;
 403 }