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