source4/libcli/smb2/create.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    SMB2 client tree handling
   5
   6    Copyright (C) Andrew Tridgell 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libcli/raw/libcliraw.h"
  24 #include "libcli/raw/raw_proto.h"
  25 #include "libcli/smb2/smb2.h"
  26 #include "libcli/smb2/smb2_calls.h"
  27 #include "librpc/gen_ndr/ndr_security.h"
  28
  29
  30 /*
  31   parse a set of SMB2 create blobs
  32 */
  33 NTSTATUS smb2_create_blob_parse(TALLOC_CTX *mem_ctx, const DATA_BLOB buffer,
  34                                 struct smb2_create_blobs *blobs)
  35 {
  36         const uint8_t *data = buffer.data;
  37         uint32_t remaining = buffer.length;
  38
  39         while (remaining > 0) {
  40                 uint32_t next;
  41                 uint32_t name_offset, name_length;
  42                 uint32_t reserved, data_offset;
  43                 uint32_t data_length;
  44                 char *tag;
  45                 DATA_BLOB b;
  46                 NTSTATUS status;
  47
  48                 if (remaining < 16) {
  49                         return NT_STATUS_INVALID_PARAMETER;
  50                 }
  51                 next        = IVAL(data, 0);
  52                 name_offset = SVAL(data, 4);
  53                 name_length = SVAL(data, 6);
  54                 reserved    = SVAL(data, 8);
  55                 data_offset = SVAL(data, 10);
  56                 data_length = IVAL(data, 12);
  57
  58                 if ((next & 0x7) != 0 ||
  59                     next > remaining ||
  60                     name_offset < 16 ||
  61                     name_offset > remaining ||
  62                     name_length != 4 || /* windows enforces this */
  63                     name_offset + name_length > remaining ||
  64                     data_offset < name_offset + name_length ||
  65                     data_offset > remaining ||
  66                     data_offset + (uint64_t)data_length > remaining) {
  67                         return NT_STATUS_INVALID_PARAMETER;
  68                 }
  69
  70                 tag = talloc_strndup(mem_ctx, (const char *)data + name_offset, name_length);
  71                 if (tag == NULL) {
  72                         return NT_STATUS_NO_MEMORY;
  73                 }
  74
  75                 b = data_blob_const(data+data_offset, data_length);
  76                 status = smb2_create_blob_add(mem_ctx, blobs, tag, b);
  77                 if (!NT_STATUS_IS_OK(status)) {
  78                         return status;
  79                 }
  80
  81                 talloc_free(tag);
  82
  83                 if (next == 0) break;
  84
  85                 remaining -= next;
  86                 data += next;
  87
  88                 if (remaining < 16) {
  89                         return NT_STATUS_INVALID_PARAMETER;
  90                 }
  91         }
  92
  93         return NT_STATUS_OK;
  94 }
  95
  96
  97 /*
  98   add a blob to a smb2_create attribute blob
  99 */
 100 static NTSTATUS smb2_create_blob_push_one(TALLOC_CTX *mem_ctx, DATA_BLOB *buffer,
 101                                           const struct smb2_create_blob *blob,
 102                                           bool last)
 103 {
 104         uint32_t ofs = buffer->length;
 105         size_t tag_length = strlen(blob->tag);
 106         uint8_t pad = smb2_padding_size(blob->data.length+tag_length, 4);
 107
 108         if (!data_blob_realloc(mem_ctx, buffer,
 109                                buffer->length + 0x14 + tag_length + blob->data.length + pad))
 110                 return NT_STATUS_NO_MEMORY;
 111
 112         if (last) {
 113                 SIVAL(buffer->data, ofs+0x00, 0);
 114         } else {
 115                 SIVAL(buffer->data, ofs+0x00, 0x14 + tag_length + blob->data.length + pad);
 116         }
 117         SSVAL(buffer->data, ofs+0x04, 0x10); /* offset of tag */
 118         SIVAL(buffer->data, ofs+0x06, tag_length); /* tag length */
 119         SSVAL(buffer->data, ofs+0x0A, 0x14 + tag_length); /* offset of data */
 120         SIVAL(buffer->data, ofs+0x0C, blob->data.length);
 121         memcpy(buffer->data+ofs+0x10, blob->tag, tag_length);
 122         SIVAL(buffer->data, ofs+0x10+tag_length, 0); /* pad? */
 123         memcpy(buffer->data+ofs+0x14+tag_length, blob->data.data, blob->data.length);
 124         memset(buffer->data+ofs+0x14+tag_length+blob->data.length, 0, pad);
 125
 126         return NT_STATUS_OK;
 127 }
 128
 129
 130 /*
 131   create a buffer of a set of create blobs
 132 */
 133 NTSTATUS smb2_create_blob_push(TALLOC_CTX *mem_ctx, DATA_BLOB *buffer,
 134                                const struct smb2_create_blobs blobs)
 135 {
 136         int i;
 137         NTSTATUS status;
 138
 139         *buffer = data_blob(NULL, 0);
 140         for (i=0; i < blobs.num_blobs; i++) {
 141                 bool last = false;
 142                 const struct smb2_create_blob *c;
 143
 144                 if ((i + 1) == blobs.num_blobs) {
 145                         last = true;
 146                 }
 147
 148                 c = &blobs.blobs[i];
 149                 status = smb2_create_blob_push_one(mem_ctx, buffer, c, last);
 150                 if (!NT_STATUS_IS_OK(status)) {
 151                         return status;
 152                 }
 153         }
 154         return NT_STATUS_OK;
 155 }
 156
 157
 158 NTSTATUS smb2_create_blob_add(TALLOC_CTX *mem_ctx, struct smb2_create_blobs *b,
 159                               const char *tag, DATA_BLOB data)
 160 {
 161         struct smb2_create_blob *array;
 162
 163         array = talloc_realloc(mem_ctx, b->blobs,
 164                                struct smb2_create_blob,
 165                                b->num_blobs + 1);
 166         NT_STATUS_HAVE_NO_MEMORY(array);
 167         b->blobs = array;
 168
 169         b->blobs[b->num_blobs].tag = talloc_strdup(b->blobs, tag);
 170         NT_STATUS_HAVE_NO_MEMORY(b->blobs[b->num_blobs].tag);
 171
 172         if (data.data) {
 173                 b->blobs[b->num_blobs].data = data_blob_talloc(b->blobs,
 174                                                                data.data,
 175                                                                data.length);
 176                 NT_STATUS_HAVE_NO_MEMORY(b->blobs[b->num_blobs].data.data);
 177         } else {
 178                 b->blobs[b->num_blobs].data = data_blob(NULL, 0);
 179         }
 180
 181         b->num_blobs += 1;
 182
 183         return NT_STATUS_OK;
 184 }
 185
 186 /*
 187   send a create request
 188 */
 189 struct smb2_request *smb2_create_send(struct smb2_tree *tree, struct smb2_create *io)
 190 {
 191         struct smb2_request *req;
 192         NTSTATUS status;
 193         DATA_BLOB blob;
 194         struct smb2_create_blobs blobs;
 195         int i;
 196
 197         ZERO_STRUCT(blobs);
 198
 199         req = smb2_request_init_tree(tree, SMB2_OP_CREATE, 0x38, true, 0);
 200         if (req == NULL) return NULL;
 201
 202         SCVAL(req->out.body, 0x02, io->in.security_flags);
 203         SCVAL(req->out.body, 0x03, io->in.oplock_level);
 204         SIVAL(req->out.body, 0x04, io->in.impersonation_level);
 205         SBVAL(req->out.body, 0x08, io->in.create_flags);
 206         SBVAL(req->out.body, 0x10, io->in.reserved);
 207         SIVAL(req->out.body, 0x18, io->in.desired_access);
 208         SIVAL(req->out.body, 0x1C, io->in.file_attributes);
 209         SIVAL(req->out.body, 0x20, io->in.share_access);
 210         SIVAL(req->out.body, 0x24, io->in.create_disposition);
 211         SIVAL(req->out.body, 0x28, io->in.create_options);
 212
 213         status = smb2_push_o16s16_string(&req->out, 0x2C, io->in.fname);
 214         if (!NT_STATUS_IS_OK(status)) {
 215                 talloc_free(req);
 216                 return NULL;
 217         }
 218
 219         /* now add all the optional blobs */
 220         if (io->in.eas.num_eas != 0) {
 221                 DATA_BLOB b = data_blob_talloc(req, NULL,
 222                                                ea_list_size_chained(io->in.eas.num_eas, io->in.eas.eas, 4));
 223                 ea_put_list_chained(b.data, io->in.eas.num_eas, io->in.eas.eas, 4);
 224                 status = smb2_create_blob_add(req, &blobs,
 225                                               SMB2_CREATE_TAG_EXTA, b);
 226                 if (!NT_STATUS_IS_OK(status)) {
 227                         talloc_free(req);
 228                         return NULL;
 229                 }
 230                 data_blob_free(&b);
 231         }
 232
 233         /* an empty MxAc tag seems to be used to ask the server to
 234            return the maximum access mask allowed on the file */
 235         if (io->in.query_maximal_access) {
 236                 /* TODO: MS-SMB2 2.2.13.2.5 says this can contain a timestamp? What to do
 237                    with that if it doesn't match? */
 238                 status = smb2_create_blob_add(req, &blobs,
 239                                               SMB2_CREATE_TAG_MXAC, data_blob(NULL, 0));
 240                 if (!NT_STATUS_IS_OK(status)) {
 241                         talloc_free(req);
 242                         return NULL;
 243                 }
 244         }
 245
 246         if (io->in.alloc_size != 0) {
 247                 uint8_t data[8];
 248                 SBVAL(data, 0, io->in.alloc_size);
 249                 status = smb2_create_blob_add(req, &blobs,
 250                                               SMB2_CREATE_TAG_ALSI, data_blob_const(data, 8));
 251                 if (!NT_STATUS_IS_OK(status)) {
 252                         talloc_free(req);
 253                         return NULL;
 254                 }
 255         }
 256
 257         if (io->in.durable_open) {
 258                 status = smb2_create_blob_add(req, &blobs,
 259                                               SMB2_CREATE_TAG_DHNQ, data_blob_talloc_zero(req, 16));
 260                 if (!NT_STATUS_IS_OK(status)) {
 261                         talloc_free(req);
 262                         return NULL;
 263                 }
 264         }
 265
 266         if (io->in.durable_handle) {
 267                 uint8_t data[16];
 268                 smb2_push_handle(data, io->in.durable_handle);
 269                 status = smb2_create_blob_add(req, &blobs,
 270                                               SMB2_CREATE_TAG_DHNC, data_blob_const(data, 16));
 271                 if (!NT_STATUS_IS_OK(status)) {
 272                         talloc_free(req);
 273                         return NULL;
 274                 }
 275         }
 276
 277         if (io->in.timewarp) {
 278                 uint8_t data[8];
 279                 SBVAL(data, 0, io->in.timewarp);
 280                 status = smb2_create_blob_add(req, &blobs,
 281                                               SMB2_CREATE_TAG_TWRP, data_blob_const(data, 8));
 282                 if (!NT_STATUS_IS_OK(status)) {
 283                         talloc_free(req);
 284                         return NULL;
 285                 }
 286         }
 287
 288         if (io->in.sec_desc) {
 289                 enum ndr_err_code ndr_err;
 290                 DATA_BLOB sd_blob;
 291                 ndr_err = ndr_push_struct_blob(&sd_blob, req, NULL,
 292                                                io->in.sec_desc,
 293                                                (ndr_push_flags_fn_t)ndr_push_security_descriptor);
 294                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 295                         talloc_free(req);
 296                         return NULL;
 297                 }
 298                 status = smb2_create_blob_add(req, &blobs,
 299                                               SMB2_CREATE_TAG_SECD, sd_blob);
 300                 if (!NT_STATUS_IS_OK(status)) {
 301                         talloc_free(req);
 302                         return NULL;
 303                 }
 304         }
 305
 306         if (io->in.query_on_disk_id) {
 307                 status = smb2_create_blob_add(req, &blobs,
 308                                               SMB2_CREATE_TAG_QFID, data_blob(NULL, 0));
 309                 if (!NT_STATUS_IS_OK(status)) {
 310                         talloc_free(req);
 311                         return NULL;
 312                 }
 313         }
 314
 315         /* and any custom blobs */
 316         for (i=0;i<io->in.blobs.num_blobs;i++) {
 317                 status = smb2_create_blob_add(req, &blobs,
 318                                               io->in.blobs.blobs[i].tag,
 319                                               io->in.blobs.blobs[i].data);
 320                 if (!NT_STATUS_IS_OK(status)) {
 321                         talloc_free(req);
 322                         return NULL;
 323                 }
 324         }
 325
 326
 327         status = smb2_create_blob_push(req, &blob, blobs);
 328         if (!NT_STATUS_IS_OK(status)) {
 329                 talloc_free(req);
 330                 return NULL;
 331         }
 332
 333         status = smb2_push_o32s32_blob(&req->out, 0x30, blob);
 334         if (!NT_STATUS_IS_OK(status)) {
 335                 talloc_free(req);
 336                 return NULL;
 337         }
 338
 339         data_blob_free(&blob);
 340
 341         smb2_transport_send(req);
 342
 343         return req;
 344 }
 345
 346
 347 /*
 348   recv a create reply
 349 */
 350 NTSTATUS smb2_create_recv(struct smb2_request *req, TALLOC_CTX *mem_ctx, struct smb2_create *io)
 351 {
 352         NTSTATUS status;
 353         DATA_BLOB blob;
 354         int i;
 355
 356         if (!smb2_request_receive(req) ||
 357             !smb2_request_is_ok(req)) {
 358                 return smb2_request_destroy(req);
 359         }
 360
 361         SMB2_CHECK_PACKET_RECV(req, 0x58, true);
 362         ZERO_STRUCT(io->out);
 363         io->out.oplock_level   = CVAL(req->in.body, 0x02);
 364         io->out.reserved       = CVAL(req->in.body, 0x03);
 365         io->out.create_action  = IVAL(req->in.body, 0x04);
 366         io->out.create_time    = smbcli_pull_nttime(req->in.body, 0x08);
 367         io->out.access_time    = smbcli_pull_nttime(req->in.body, 0x10);
 368         io->out.write_time     = smbcli_pull_nttime(req->in.body, 0x18);
 369         io->out.change_time    = smbcli_pull_nttime(req->in.body, 0x20);
 370         io->out.alloc_size     = BVAL(req->in.body, 0x28);
 371         io->out.size           = BVAL(req->in.body, 0x30);
 372         io->out.file_attr      = IVAL(req->in.body, 0x38);
 373         io->out.reserved2      = IVAL(req->in.body, 0x3C);
 374         smb2_pull_handle(req->in.body+0x40, &io->out.file.handle);
 375         status = smb2_pull_o32s32_blob(&req->in, mem_ctx, req->in.body+0x50, &blob);
 376         if (!NT_STATUS_IS_OK(status)) {
 377                 smb2_request_destroy(req);
 378                 return status;
 379         }
 380
 381         status = smb2_create_blob_parse(mem_ctx, blob, &io->out.blobs);
 382         if (!NT_STATUS_IS_OK(status)) {
 383                 smb2_request_destroy(req);
 384                 return status;
 385         }
 386
 387         /* pull out the parsed blobs */
 388         for (i=0;i<io->out.blobs.num_blobs;i++) {
 389                 if (strcmp(io->out.blobs.blobs[i].tag, SMB2_CREATE_TAG_MXAC) == 0) {
 390                         /* TODO: this also contains a status field in
 391                            first 4 bytes */
 392                         if (io->out.blobs.blobs[i].data.length != 8) {
 393                                 smb2_request_destroy(req);
 394                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 395                         }
 396                         io->out.maximal_access = IVAL(io->out.blobs.blobs[i].data.data, 4);
 397                 }
 398                 if (strcmp(io->out.blobs.blobs[i].tag, SMB2_CREATE_TAG_QFID) == 0) {
 399                         if (io->out.blobs.blobs[i].data.length != 32) {
 400                                 smb2_request_destroy(req);
 401                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 402                         }
 403                         memcpy(io->out.on_disk_id, io->out.blobs.blobs[i].data.data, 32);
 404                 }
 405         }
 406
 407         data_blob_free(&blob);
 408
 409         return smb2_request_destroy(req);
 410 }
 411
 412 /*
 413   sync create request
 414 */
 415 NTSTATUS smb2_create(struct smb2_tree *tree, TALLOC_CTX *mem_ctx, struct smb2_create *io)
 416 {
 417         struct smb2_request *req = smb2_create_send(tree, io);
 418         return smb2_create_recv(req, mem_ctx, io);
 419 }