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mount.cifs: don't allow it to be run as setuid root program
[Samba/nascimento.git] / source3 / smbd / smb2_find.c
blob546aed8db3eaee806df09c91cde531b38fef2cc1
1 /*
2 Unix SMB/CIFS implementation.
3 Core SMB2 server
4
5 Copyright (C) Stefan Metzmacher 2009
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "smbd/globals.h"
23 #include "../libcli/smb/smb_common.h"
24
25 static struct tevent_req *smbd_smb2_find_send(TALLOC_CTX *mem_ctx,
26 struct tevent_context *ev,
27 struct smbd_smb2_request *smb2req,
28 uint8_t in_file_info_class,
29 uint8_t in_flags,
30 uint32_t in_file_index,
31 uint64_t in_file_id_volatile,
32 uint32_t in_output_buffer_length,
33 const char *in_file_name);
34 static NTSTATUS smbd_smb2_find_recv(struct tevent_req *req,
35 TALLOC_CTX *mem_ctx,
36 DATA_BLOB *out_output_buffer);
37
38 static void smbd_smb2_request_find_done(struct tevent_req *subreq);
39 NTSTATUS smbd_smb2_request_process_find(struct smbd_smb2_request *req)
40 {
41 const uint8_t *inhdr;
42 const uint8_t *inbody;
43 int i = req->current_idx;
44 size_t expected_body_size = 0x21;
45 size_t body_size;
46 uint8_t in_file_info_class;
47 uint8_t in_flags;
48 uint32_t in_file_index;
49 uint64_t in_file_id_persistent;
50 uint64_t in_file_id_volatile;
51 uint16_t in_file_name_offset;
52 uint16_t in_file_name_length;
53 DATA_BLOB in_file_name_buffer;
54 char *in_file_name_string;
55 size_t in_file_name_string_size;
56 uint32_t in_output_buffer_length;
57 struct tevent_req *subreq;
58 bool ok;
59
60 inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
61 if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
62 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
63 }
64
65 inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
66
67 body_size = SVAL(inbody, 0x00);
68 if (body_size != expected_body_size) {
69 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
70 }
71
72 in_file_info_class = CVAL(inbody, 0x02);
73 in_flags = CVAL(inbody, 0x03);
74 in_file_index = IVAL(inbody, 0x04);
75 in_file_id_persistent = BVAL(inbody, 0x08);
76 in_file_id_volatile = BVAL(inbody, 0x10);
77 in_file_name_offset = SVAL(inbody, 0x18);
78 in_file_name_length = SVAL(inbody, 0x1A);
79 in_output_buffer_length = IVAL(inbody, 0x1C);
80
81 if (in_file_name_offset == 0 && in_file_name_length == 0) {
82 /* This is ok */
83 } else if (in_file_name_offset !=
84 (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
85 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
86 }
87
88 if (in_file_name_length > req->in.vector[i+2].iov_len) {
89 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
90 }
91
92 in_file_name_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
93 in_file_name_buffer.length = in_file_name_length;
94
95 ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
96 in_file_name_buffer.data,
97 in_file_name_buffer.length,
98 &in_file_name_string,
99 &in_file_name_string_size, false);
100 if (!ok) {
101 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
102 }
103
104 if (req->compat_chain_fsp) {
105 /* skip check */
106 } else if (in_file_id_persistent != 0) {
107 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
108 }
109
110 subreq = smbd_smb2_find_send(req,
111 req->sconn->smb2.event_ctx,
112 req,
113 in_file_info_class,
114 in_flags,
115 in_file_index,
116 in_file_id_volatile,
117 in_output_buffer_length,
118 in_file_name_string);
119 if (subreq == NULL) {
120 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
121 }
122 tevent_req_set_callback(subreq, smbd_smb2_request_find_done, req);
123
124 return smbd_smb2_request_pending_queue(req, subreq);
125 }
126
127 static void smbd_smb2_request_find_done(struct tevent_req *subreq)
128 {
129 struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
130 struct smbd_smb2_request);
131 int i = req->current_idx;
132 uint8_t *outhdr;
133 DATA_BLOB outbody;
134 DATA_BLOB outdyn;
135 uint16_t out_output_buffer_offset;
136 DATA_BLOB out_output_buffer = data_blob_null;
137 NTSTATUS status;
138 NTSTATUS error; /* transport error */
139
140 status = smbd_smb2_find_recv(subreq,
141 req,
142 &out_output_buffer);
143 TALLOC_FREE(subreq);
144 if (!NT_STATUS_IS_OK(status)) {
145 error = smbd_smb2_request_error(req, status);
146 if (!NT_STATUS_IS_OK(error)) {
147 smbd_server_connection_terminate(req->sconn,
148 nt_errstr(error));
149 return;
150 }
151 return;
152 }
153
154 out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
155
156 outhdr = (uint8_t *)req->out.vector[i].iov_base;
157
158 outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
159 if (outbody.data == NULL) {
160 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
161 if (!NT_STATUS_IS_OK(error)) {
162 smbd_server_connection_terminate(req->sconn,
163 nt_errstr(error));
164 return;
165 }
166 return;
167 }
168
169 SSVAL(outbody.data, 0x00, 0x08 + 1); /* struct size */
170 SSVAL(outbody.data, 0x02,
171 out_output_buffer_offset); /* output buffer offset */
172 SIVAL(outbody.data, 0x04,
173 out_output_buffer.length); /* output buffer length */
174
175 outdyn = out_output_buffer;
176
177 error = smbd_smb2_request_done(req, outbody, &outdyn);
178 if (!NT_STATUS_IS_OK(error)) {
179 smbd_server_connection_terminate(req->sconn,
180 nt_errstr(error));
181 return;
182 }
183 }
184
185 struct smbd_smb2_find_state {
186 struct smbd_smb2_request *smb2req;
187 DATA_BLOB out_output_buffer;
188 };
189
190 static struct tevent_req *smbd_smb2_find_send(TALLOC_CTX *mem_ctx,
191 struct tevent_context *ev,
192 struct smbd_smb2_request *smb2req,
193 uint8_t in_file_info_class,
194 uint8_t in_flags,
195 uint32_t in_file_index,
196 uint64_t in_file_id_volatile,
197 uint32_t in_output_buffer_length,
198 const char *in_file_name)
199 {
200 struct tevent_req *req;
201 struct smbd_smb2_find_state *state;
202 struct smb_request *smbreq;
203 connection_struct *conn = smb2req->tcon->compat_conn;
204 files_struct *fsp;
205 NTSTATUS status;
206 NTSTATUS empty_status;
207 uint32_t info_level;
208 uint32_t max_count;
209 char *pdata;
210 char *base_data;
211 char *end_data;
212 int last_entry_off = 0;
213 uint64_t off = 0;
214 uint32_t num = 0;
215 uint32_t dirtype = aHIDDEN | aSYSTEM | aDIR;
216 const char *directory;
217 bool dont_descend = false;
218 bool ask_sharemode = true;
219
220 req = tevent_req_create(mem_ctx, &state,
221 struct smbd_smb2_find_state);
222 if (req == NULL) {
223 return NULL;
224 }
225 state->smb2req = smb2req;
226 state->out_output_buffer = data_blob_null;
227
228 DEBUG(10,("smbd_smb2_find_send: file_id[0x%016llX]\n",
229 (unsigned long long)in_file_id_volatile));
230
231 smbreq = smbd_smb2_fake_smb_request(smb2req);
232 if (tevent_req_nomem(smbreq, req)) {
233 return tevent_req_post(req, ev);
234 }
235
236 fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
237 if (fsp == NULL) {
238 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
239 return tevent_req_post(req, ev);
240 }
241 if (conn != fsp->conn) {
242 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
243 return tevent_req_post(req, ev);
244 }
245 if (smb2req->session->vuid != fsp->vuid) {
246 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
247 return tevent_req_post(req, ev);
248 }
249
250 if (!fsp->is_directory) {
251 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
252 return tevent_req_post(req, ev);
253 }
254
255 directory = fsp->fsp_name->base_name;
256
257 if (strcmp(in_file_name, "") == 0) {
258 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
259 return tevent_req_post(req, ev);
260 }
261 if (strcmp(in_file_name, "\\") == 0) {
262 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
263 return tevent_req_post(req, ev);
264 }
265 if (strcmp(in_file_name, "/") == 0) {
266 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
267 return tevent_req_post(req, ev);
268 }
269
270 if (in_output_buffer_length > 0x10000) {
271 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
272 return tevent_req_post(req, ev);
273 }
274
275 switch (in_file_info_class) {
276 case SMB2_FIND_DIRECTORY_INFO:
277 info_level = SMB_FIND_FILE_DIRECTORY_INFO;
278 break;
279
280 case SMB2_FIND_FULL_DIRECTORY_INFO:
281 info_level = SMB_FIND_FILE_FULL_DIRECTORY_INFO;
282 break;
283
284 case SMB2_FIND_BOTH_DIRECTORY_INFO:
285 info_level = SMB_FIND_FILE_BOTH_DIRECTORY_INFO;
286 break;
287
288 case SMB2_FIND_NAME_INFO:
289 info_level = SMB_FIND_FILE_NAMES_INFO;
290 break;
291
292 case SMB2_FIND_ID_BOTH_DIRECTORY_INFO:
293 info_level = SMB_FIND_ID_BOTH_DIRECTORY_INFO;
294 break;
295
296 case SMB2_FIND_ID_FULL_DIRECTORY_INFO:
297 info_level = SMB_FIND_ID_FULL_DIRECTORY_INFO;
298 break;
299
300 default:
301 tevent_req_nterror(req, NT_STATUS_INVALID_INFO_CLASS);
302 return tevent_req_post(req, ev);
303 }
304
305 if (in_flags & SMB2_CONTINUE_FLAG_REOPEN) {
306 if (fsp->dptr) {
307 dptr_CloseDir(fsp->dptr);
308 fsp->dptr = NULL;
309 }
310 }
311
312 if (fsp->dptr == NULL) {
313 bool wcard_has_wild;
314
315 if (!(fsp->access_mask & SEC_DIR_LIST)) {
316 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
317 return tevent_req_post(req, ev);
318 }
319
320 wcard_has_wild = ms_has_wild(in_file_name);
321
322 status = dptr_create(conn,
323 directory,
324 false, /* old_handle */
325 false, /* expect_close */
326 0, /* spid */
327 in_file_name, /* wcard */
328 wcard_has_wild,
329 dirtype,
330 &fsp->dptr);
331 if (!NT_STATUS_IS_OK(status)) {
332 tevent_req_nterror(req, status);
333 return tevent_req_post(req, ev);
334 }
335
336 empty_status = NT_STATUS_NO_SUCH_FILE;
337 } else {
338 empty_status = STATUS_NO_MORE_FILES;
339 }
340
341 if (in_flags & SMB2_CONTINUE_FLAG_RESTART) {
342 dptr_SeekDir(fsp->dptr, 0);
343 }
344
345 if (in_flags & SMB2_CONTINUE_FLAG_SINGLE) {
346 max_count = 1;
347 } else {
348 max_count = UINT16_MAX;
349 }
350
351 #define DIR_ENTRY_SAFETY_MARGIN 4096
352
353 state->out_output_buffer = data_blob_talloc(state, NULL,
354 in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN);
355 if (tevent_req_nomem(state->out_output_buffer.data, req)) {
356 return tevent_req_post(req, ev);
357 }
358
359 state->out_output_buffer.length = 0;
360 pdata = (char *)state->out_output_buffer.data;
361 base_data = pdata;
362 end_data = pdata + in_output_buffer_length;
363 last_entry_off = 0;
364 off = 0;
365 num = 0;
366
367 DEBUG(8,("smbd_smb2_find_send: dirpath=<%s> dontdescend=<%s>\n",
368 directory, lp_dontdescend(SNUM(conn))));
369 if (in_list(directory,lp_dontdescend(SNUM(conn)),conn->case_sensitive)) {
370 dont_descend = true;
371 }
372
373 ask_sharemode = lp_parm_bool(SNUM(conn),
374 "smbd", "search ask sharemode",
375 true);
376
377 while (true) {
378 bool ok;
379 bool got_exact_match = false;
380 bool out_of_space = false;
381 int space_remaining = in_output_buffer_length - off;
382
383 ok = smbd_dirptr_lanman2_entry(state,
384 conn,
385 fsp->dptr,
386 smbreq->flags2,
387 in_file_name,
388 dirtype,
389 info_level,
390 false, /* requires_resume_key */
391 dont_descend,
392 ask_sharemode,
393 8, /* align to 8 bytes */
394 false, /* no padding */
395 &pdata,
396 base_data,
397 end_data,
398 space_remaining,
399 &out_of_space,
400 &got_exact_match,
401 &last_entry_off,
402 NULL);
403
404 off = PTR_DIFF(pdata, base_data);
405
406 if (!ok) {
407 if (num > 0) {
408 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
409 tevent_req_done(req);
410 return tevent_req_post(req, ev);
411 } else if (out_of_space) {
412 tevent_req_nterror(req, NT_STATUS_INFO_LENGTH_MISMATCH);
413 return tevent_req_post(req, ev);
414 } else {
415 tevent_req_nterror(req, empty_status);
416 return tevent_req_post(req, ev);
417 }
418 }
419
420 num++;
421 state->out_output_buffer.length = off;
422
423 if (num < max_count) {
424 continue;
425 }
426
427 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
428 tevent_req_done(req);
429 return tevent_req_post(req, ev);
430 }
431
432 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
433 return tevent_req_post(req, ev);
434 }
435
436 static NTSTATUS smbd_smb2_find_recv(struct tevent_req *req,
437 TALLOC_CTX *mem_ctx,
438 DATA_BLOB *out_output_buffer)
439 {
440 NTSTATUS status;
441 struct smbd_smb2_find_state *state = tevent_req_data(req,
442 struct smbd_smb2_find_state);
443
444 if (tevent_req_is_nterror(req, &status)) {
445 tevent_req_received(req);
446 return status;
447 }
448
449 *out_output_buffer = state->out_output_buffer;
450 talloc_steal(mem_ctx, out_output_buffer->data);
451
452 tevent_req_received(req);
453 return NT_STATUS_OK;
454 }