Commit | Line | Data |
---|---|---|
60b6c79c | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
60b6c79c | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
60b6c79c | 7 | * |
60b6c79c MD |
8 | */ |
9 | ||
6c1c0768 | 10 | #define _LGPL_SOURCE |
a62bbe8c FD |
11 | #include <assert.h> |
12 | #include <fcntl.h> | |
13 | #include <grp.h> | |
60b6c79c | 14 | #include <limits.h> |
a62bbe8c FD |
15 | #include <pwd.h> |
16 | #include <sched.h> | |
17 | #include <signal.h> | |
60b6c79c MD |
18 | #include <stdio.h> |
19 | #include <stdlib.h> | |
20 | #include <string.h> | |
60b6c79c | 21 | #include <sys/stat.h> |
a62bbe8c FD |
22 | #include <sys/types.h> |
23 | #include <sys/wait.h> | |
60b6c79c | 24 | #include <unistd.h> |
60b6c79c | 25 | |
0ef03255 | 26 | #include <common/lttng-kernel.h> |
90e535ef | 27 | #include <common/common.h> |
3fd15a74 | 28 | #include <common/utils.h> |
e8fa9fb0 | 29 | #include <common/compat/getenv.h> |
e1055edb | 30 | #include <common/compat/prctl.h> |
2038dd6c JG |
31 | #include <common/unix.h> |
32 | #include <common/defaults.h> | |
241e0a5a FD |
33 | #include <common/lttng-elf.h> |
34 | ||
35 | #include <lttng/constant.h> | |
60b6c79c | 36 | |
0857097f DG |
37 | #include "runas.h" |
38 | ||
a62bbe8c FD |
39 | #define GETPW_BUFFER_FALLBACK_SIZE 4096 |
40 | ||
7567352f | 41 | struct run_as_data; |
fe9f7760 FD |
42 | struct run_as_ret; |
43 | typedef int (*run_as_fct)(struct run_as_data *data, struct run_as_ret *ret_value); | |
c2b75c49 | 44 | |
93bed9fe JG |
45 | enum run_as_cmd { |
46 | RUN_AS_MKDIR, | |
47 | RUN_AS_MKDIRAT, | |
48 | RUN_AS_MKDIR_RECURSIVE, | |
49 | RUN_AS_MKDIRAT_RECURSIVE, | |
50 | RUN_AS_OPEN, | |
51 | RUN_AS_OPENAT, | |
52 | RUN_AS_UNLINK, | |
53 | RUN_AS_UNLINKAT, | |
54 | RUN_AS_RMDIR, | |
55 | RUN_AS_RMDIRAT, | |
56 | RUN_AS_RMDIR_RECURSIVE, | |
57 | RUN_AS_RMDIRAT_RECURSIVE, | |
58 | RUN_AS_RENAME, | |
59 | RUN_AS_RENAMEAT, | |
60 | RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET, | |
61 | RUN_AS_EXTRACT_SDT_PROBE_OFFSETS, | |
60b6c79c MD |
62 | }; |
63 | ||
93bed9fe JG |
64 | struct run_as_mkdir_data { |
65 | int dirfd; | |
66 | char path[LTTNG_PATH_MAX]; | |
67 | mode_t mode; | |
68 | } LTTNG_PACKED; | |
69 | ||
e11d277b | 70 | struct run_as_open_data { |
93bed9fe JG |
71 | int dirfd; |
72 | char path[LTTNG_PATH_MAX]; | |
60b6c79c MD |
73 | int flags; |
74 | mode_t mode; | |
93bed9fe | 75 | } LTTNG_PACKED; |
60b6c79c | 76 | |
4628484a | 77 | struct run_as_unlink_data { |
93bed9fe JG |
78 | int dirfd; |
79 | char path[LTTNG_PATH_MAX]; | |
80 | } LTTNG_PACKED; | |
4628484a | 81 | |
93bed9fe JG |
82 | struct run_as_rmdir_data { |
83 | int dirfd; | |
84 | char path[LTTNG_PATH_MAX]; | |
f75c5439 | 85 | int flags; /* enum lttng_directory_handle_rmdir_recursive_flags */ |
93bed9fe | 86 | } LTTNG_PACKED; |
7567352f | 87 | |
241e0a5a | 88 | struct run_as_extract_elf_symbol_offset_data { |
93bed9fe | 89 | int fd; |
241e0a5a | 90 | char function[LTTNG_SYMBOL_NAME_LEN]; |
93bed9fe | 91 | } LTTNG_PACKED; |
241e0a5a | 92 | |
0ef03255 | 93 | struct run_as_extract_sdt_probe_offsets_data { |
93bed9fe | 94 | int fd; |
0ef03255 FD |
95 | char probe_name[LTTNG_SYMBOL_NAME_LEN]; |
96 | char provider_name[LTTNG_SYMBOL_NAME_LEN]; | |
93bed9fe | 97 | } LTTNG_PACKED; |
0ef03255 | 98 | |
93bed9fe JG |
99 | struct run_as_rename_data { |
100 | /* | |
101 | * [0] = old_dirfd | |
102 | * [1] = new_dirfd | |
103 | */ | |
104 | int dirfds[2]; | |
105 | char old_path[LTTNG_PATH_MAX]; | |
106 | char new_path[LTTNG_PATH_MAX]; | |
107 | } LTTNG_PACKED; | |
fe9f7760 FD |
108 | |
109 | struct run_as_open_ret { | |
93bed9fe JG |
110 | int fd; |
111 | } LTTNG_PACKED; | |
fe9f7760 | 112 | |
241e0a5a FD |
113 | struct run_as_extract_elf_symbol_offset_ret { |
114 | uint64_t offset; | |
93bed9fe | 115 | } LTTNG_PACKED; |
241e0a5a | 116 | |
0ef03255 FD |
117 | struct run_as_extract_sdt_probe_offsets_ret { |
118 | uint32_t num_offset; | |
119 | uint64_t offsets[LTTNG_KERNEL_MAX_UPROBE_NUM]; | |
93bed9fe | 120 | } LTTNG_PACKED; |
7567352f MD |
121 | |
122 | struct run_as_data { | |
123 | enum run_as_cmd cmd; | |
124 | union { | |
93bed9fe | 125 | struct run_as_mkdir_data mkdir; |
7567352f MD |
126 | struct run_as_open_data open; |
127 | struct run_as_unlink_data unlink; | |
93bed9fe JG |
128 | struct run_as_rmdir_data rmdir; |
129 | struct run_as_rename_data rename; | |
241e0a5a | 130 | struct run_as_extract_elf_symbol_offset_data extract_elf_symbol_offset; |
0ef03255 | 131 | struct run_as_extract_sdt_probe_offsets_data extract_sdt_probe_offsets; |
7567352f MD |
132 | } u; |
133 | uid_t uid; | |
134 | gid_t gid; | |
93bed9fe | 135 | } LTTNG_PACKED; |
4628484a | 136 | |
fe9f7760 FD |
137 | /* |
138 | * The run_as_ret structure holds the returned value and status of the command. | |
139 | * | |
140 | * The `u` union field holds the return value of the command; in most cases it | |
141 | * represents the success or the failure of the command. In more complex | |
142 | * commands, it holds a computed value. | |
143 | * | |
144 | * The _errno field is the errno recorded after the execution of the command. | |
145 | * | |
146 | * The _error fields is used the signify that return status of the command. For | |
147 | * simple commands returning `int` the _error field will be the same as the | |
148 | * ret_int field. In complex commands, it signify the success or failure of the | |
149 | * command. | |
150 | * | |
151 | */ | |
df5b86c8 | 152 | struct run_as_ret { |
fe9f7760 | 153 | union { |
93bed9fe | 154 | int ret; |
fe9f7760 | 155 | struct run_as_open_ret open; |
241e0a5a | 156 | struct run_as_extract_elf_symbol_offset_ret extract_elf_symbol_offset; |
0ef03255 | 157 | struct run_as_extract_sdt_probe_offsets_ret extract_sdt_probe_offsets; |
fe9f7760 | 158 | } u; |
df5b86c8 | 159 | int _errno; |
fe9f7760 | 160 | bool _error; |
93bed9fe JG |
161 | } LTTNG_PACKED; |
162 | ||
163 | #define COMMAND_IN_FDS(data_ptr) ({ \ | |
164 | int *fds = NULL; \ | |
165 | if (command_properties[data_ptr->cmd].in_fds_offset != -1) { \ | |
166 | fds = (int *) ((char *) data_ptr + command_properties[data_ptr->cmd].in_fds_offset); \ | |
167 | } \ | |
168 | fds; \ | |
169 | }) | |
170 | ||
171 | #define COMMAND_OUT_FDS(cmd, ret_ptr) ({ \ | |
172 | int *fds = NULL; \ | |
173 | if (command_properties[cmd].out_fds_offset != -1) { \ | |
174 | fds = (int *) ((char *) ret_ptr + command_properties[cmd].out_fds_offset); \ | |
175 | } \ | |
176 | fds; \ | |
177 | }) | |
178 | ||
179 | #define COMMAND_IN_FD_COUNT(data_ptr) ({ \ | |
180 | command_properties[data_ptr->cmd].in_fd_count; \ | |
181 | }) | |
182 | ||
183 | #define COMMAND_OUT_FD_COUNT(cmd) ({ \ | |
184 | command_properties[cmd].out_fd_count; \ | |
185 | }) | |
186 | ||
187 | #define COMMAND_USE_CWD_FD(data_ptr) command_properties[data_ptr->cmd].use_cwd_fd | |
188 | ||
189 | struct run_as_command_properties { | |
190 | /* Set to -1 when not applicable. */ | |
191 | ptrdiff_t in_fds_offset, out_fds_offset; | |
192 | unsigned int in_fd_count, out_fd_count; | |
193 | bool use_cwd_fd; | |
194 | }; | |
195 | ||
196 | static const struct run_as_command_properties command_properties[] = { | |
197 | [RUN_AS_MKDIR] = { | |
198 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), | |
199 | .in_fd_count = 1, | |
200 | .out_fds_offset = -1, | |
201 | .out_fd_count = 0, | |
202 | .use_cwd_fd = true, | |
203 | }, | |
204 | [RUN_AS_MKDIRAT] = { | |
205 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), | |
206 | .in_fd_count = 1, | |
207 | .out_fds_offset = -1, | |
208 | .out_fd_count = 0, | |
209 | .use_cwd_fd = false, | |
210 | }, | |
211 | [RUN_AS_MKDIR_RECURSIVE] = { | |
212 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), | |
213 | .in_fd_count = 1, | |
214 | .out_fds_offset = -1, | |
215 | .out_fd_count = 0, | |
216 | .use_cwd_fd = true, | |
217 | }, | |
218 | [RUN_AS_MKDIRAT_RECURSIVE] = { | |
219 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), | |
220 | .in_fd_count = 1, | |
221 | .out_fds_offset = -1, | |
222 | .out_fd_count = 0, | |
223 | .use_cwd_fd = false, | |
224 | }, | |
225 | [RUN_AS_OPEN] = { | |
226 | .in_fds_offset = offsetof(struct run_as_data, u.open.dirfd), | |
227 | .in_fd_count = 1, | |
228 | .out_fds_offset = offsetof(struct run_as_ret, u.open.fd), | |
229 | .out_fd_count = 1, | |
230 | .use_cwd_fd = true, | |
231 | }, | |
232 | [RUN_AS_OPENAT] = { | |
233 | .in_fds_offset = offsetof(struct run_as_data, u.open.dirfd), | |
234 | .in_fd_count = 1, | |
235 | .out_fds_offset = offsetof(struct run_as_ret, u.open.fd), | |
236 | .out_fd_count = 1, | |
237 | .use_cwd_fd = false, | |
238 | }, | |
239 | [RUN_AS_UNLINK] = { | |
240 | .in_fds_offset = offsetof(struct run_as_data, u.unlink.dirfd), | |
241 | .in_fd_count = 1, | |
242 | .out_fds_offset = -1, | |
243 | .out_fd_count = 0, | |
244 | .use_cwd_fd = true, | |
245 | }, | |
246 | [RUN_AS_UNLINKAT] = { | |
247 | .in_fds_offset = offsetof(struct run_as_data, u.unlink.dirfd), | |
248 | .in_fd_count = 1, | |
249 | .out_fds_offset = -1, | |
250 | .out_fd_count = 0, | |
251 | .use_cwd_fd = false, | |
252 | }, | |
253 | [RUN_AS_RMDIR_RECURSIVE] = { | |
254 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), | |
255 | .in_fd_count = 1, | |
256 | .out_fds_offset = -1, | |
257 | .out_fd_count = 0, | |
258 | .use_cwd_fd = true, | |
259 | }, | |
260 | [RUN_AS_RMDIRAT_RECURSIVE] = { | |
261 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), | |
262 | .in_fd_count = 1, | |
263 | .out_fds_offset = -1, | |
264 | .out_fd_count = 0, | |
265 | .use_cwd_fd = false, | |
266 | }, | |
267 | [RUN_AS_RMDIR] = { | |
268 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), | |
269 | .in_fd_count = 1, | |
270 | .out_fds_offset = -1, | |
271 | .out_fd_count = 0, | |
272 | .use_cwd_fd = true, | |
273 | }, | |
274 | [RUN_AS_RMDIRAT] = { | |
275 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), | |
276 | .in_fd_count = 1, | |
277 | .out_fds_offset = -1, | |
278 | .out_fd_count = 0, | |
279 | .use_cwd_fd = false, | |
280 | }, | |
281 | [RUN_AS_RENAME] = { | |
282 | .in_fds_offset = offsetof(struct run_as_data, u.rename.dirfds), | |
283 | .in_fd_count = 2, | |
284 | .out_fds_offset = -1, | |
285 | .out_fd_count = 0, | |
286 | .use_cwd_fd = true, | |
287 | }, | |
288 | [RUN_AS_RENAMEAT] = { | |
289 | .in_fds_offset = offsetof(struct run_as_data, u.rename.dirfds), | |
290 | .in_fd_count = 2, | |
291 | .out_fds_offset = -1, | |
292 | .out_fd_count = 0, | |
293 | .use_cwd_fd = false, | |
294 | }, | |
295 | [RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET] = { | |
296 | .in_fds_offset = offsetof(struct run_as_data, | |
297 | u.extract_elf_symbol_offset.fd), | |
298 | .in_fd_count = 1, | |
299 | .out_fds_offset = -1, | |
300 | .out_fd_count = 0, | |
301 | .use_cwd_fd = false, | |
302 | }, | |
303 | [RUN_AS_EXTRACT_SDT_PROBE_OFFSETS] = { | |
304 | .in_fds_offset = offsetof(struct run_as_data, | |
305 | u.extract_sdt_probe_offsets.fd), | |
306 | .in_fd_count = 1, | |
307 | .out_fds_offset = -1, | |
308 | .out_fd_count = 0, | |
309 | .use_cwd_fd = false, | |
310 | }, | |
df5b86c8 MD |
311 | }; |
312 | ||
7567352f MD |
313 | struct run_as_worker { |
314 | pid_t pid; /* Worker PID. */ | |
315 | int sockpair[2]; | |
316 | char *procname; | |
317 | }; | |
318 | ||
319 | /* Single global worker per process (for now). */ | |
320 | static struct run_as_worker *global_worker; | |
321 | /* Lock protecting the worker. */ | |
322 | static pthread_mutex_t worker_lock = PTHREAD_MUTEX_INITIALIZER; | |
323 | ||
8f0044bf MD |
324 | #ifdef VALGRIND |
325 | static | |
326 | int use_clone(void) | |
327 | { | |
328 | return 0; | |
329 | } | |
330 | #else | |
331 | static | |
332 | int use_clone(void) | |
333 | { | |
e8fa9fb0 | 334 | return !lttng_secure_getenv("LTTNG_DEBUG_NOCLONE"); |
8f0044bf MD |
335 | } |
336 | #endif | |
337 | ||
60b6c79c MD |
338 | /* |
339 | * Create recursively directory using the FULL path. | |
340 | */ | |
341 | static | |
18710679 | 342 | int _mkdirat_recursive(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 343 | { |
60b6c79c | 344 | const char *path; |
60b6c79c | 345 | mode_t mode; |
cbf53d23 | 346 | struct lttng_directory_handle *handle; |
60b6c79c | 347 | |
93bed9fe JG |
348 | path = data->u.mkdir.path; |
349 | mode = data->u.mkdir.mode; | |
60b6c79c | 350 | |
cbf53d23 JG |
351 | handle = lttng_directory_handle_create_from_dirfd(data->u.mkdir.dirfd); |
352 | if (!handle) { | |
353 | ret_value->_errno = errno; | |
354 | ret_value->_error = true; | |
355 | ret_value->u.ret = -1; | |
356 | goto end; | |
357 | } | |
87bbb856 | 358 | /* Ownership of dirfd is transferred to the handle. */ |
93bed9fe | 359 | data->u.mkdir.dirfd = -1; |
d77dded2 | 360 | /* Safe to call as we have transitioned to the requested uid/gid. */ |
cbf53d23 JG |
361 | ret_value->u.ret = lttng_directory_handle_create_subdirectory_recursive( |
362 | handle, path, mode); | |
fe9f7760 | 363 | ret_value->_errno = errno; |
93bed9fe | 364 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
365 | lttng_directory_handle_put(handle); |
366 | end: | |
93bed9fe | 367 | return ret_value->u.ret; |
60b6c79c MD |
368 | } |
369 | ||
370 | static | |
18710679 | 371 | int _mkdirat(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 372 | { |
18710679 JG |
373 | const char *path; |
374 | mode_t mode; | |
cbf53d23 | 375 | struct lttng_directory_handle *handle; |
18710679 | 376 | |
93bed9fe JG |
377 | path = data->u.mkdir.path; |
378 | mode = data->u.mkdir.mode; | |
18710679 | 379 | |
cbf53d23 JG |
380 | handle = lttng_directory_handle_create_from_dirfd(data->u.mkdir.dirfd); |
381 | if (!handle) { | |
382 | ret_value->u.ret = -1; | |
383 | ret_value->_errno = errno; | |
384 | ret_value->_error = true; | |
385 | goto end; | |
386 | } | |
87bbb856 | 387 | /* Ownership of dirfd is transferred to the handle. */ |
93bed9fe | 388 | data->u.mkdir.dirfd = -1; |
18710679 | 389 | /* Safe to call as we have transitioned to the requested uid/gid. */ |
cbf53d23 JG |
390 | ret_value->u.ret = lttng_directory_handle_create_subdirectory( |
391 | handle, path, mode); | |
fe9f7760 | 392 | ret_value->_errno = errno; |
93bed9fe | 393 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
394 | lttng_directory_handle_put(handle); |
395 | end: | |
93bed9fe | 396 | return ret_value->u.ret; |
7567352f | 397 | } |
7ce36756 | 398 | |
7567352f | 399 | static |
fe9f7760 | 400 | int _open(struct run_as_data *data, struct run_as_ret *ret_value) |
7567352f | 401 | { |
93bed9fe | 402 | int fd; |
cbf53d23 | 403 | struct lttng_directory_handle *handle; |
93bed9fe | 404 | |
cbf53d23 JG |
405 | handle = lttng_directory_handle_create_from_dirfd(data->u.open.dirfd); |
406 | if (!handle) { | |
407 | ret_value->_errno = errno; | |
408 | ret_value->_error = true; | |
409 | ret_value->u.ret = -1; | |
410 | goto end; | |
411 | } | |
93bed9fe JG |
412 | /* Ownership of dirfd is transferred to the handle. */ |
413 | data->u.open.dirfd = -1; | |
414 | ||
cbf53d23 | 415 | fd = lttng_directory_handle_open_file(handle, |
93bed9fe JG |
416 | data->u.open.path, data->u.open.flags, |
417 | data->u.open.mode); | |
418 | if (fd < 0) { | |
419 | ret_value->u.ret = -1; | |
420 | ret_value->u.open.fd = -1; | |
421 | } else { | |
422 | ret_value->u.ret = 0; | |
423 | ret_value->u.open.fd = fd; | |
424 | } | |
425 | ||
fe9f7760 | 426 | ret_value->_errno = errno; |
93bed9fe | 427 | ret_value->_error = fd < 0; |
cbf53d23 JG |
428 | lttng_directory_handle_put(handle); |
429 | end: | |
93bed9fe | 430 | return ret_value->u.ret; |
7567352f MD |
431 | } |
432 | ||
433 | static | |
fe9f7760 | 434 | int _unlink(struct run_as_data *data, struct run_as_ret *ret_value) |
7567352f | 435 | { |
cbf53d23 | 436 | struct lttng_directory_handle *handle; |
93bed9fe | 437 | |
cbf53d23 JG |
438 | handle = lttng_directory_handle_create_from_dirfd(data->u.unlink.dirfd); |
439 | if (!handle) { | |
440 | ret_value->u.ret = -1; | |
441 | ret_value->_errno = errno; | |
442 | ret_value->_error = true; | |
443 | goto end; | |
444 | } | |
93bed9fe JG |
445 | |
446 | /* Ownership of dirfd is transferred to the handle. */ | |
447 | data->u.unlink.dirfd = -1; | |
448 | ||
cbf53d23 | 449 | ret_value->u.ret = lttng_directory_handle_unlink_file(handle, |
93bed9fe JG |
450 | data->u.unlink.path); |
451 | ret_value->_errno = errno; | |
452 | ret_value->_error = (ret_value->u.ret) ? true : false; | |
cbf53d23 JG |
453 | lttng_directory_handle_put(handle); |
454 | end: | |
93bed9fe JG |
455 | return ret_value->u.ret; |
456 | } | |
457 | ||
458 | static | |
459 | int _rmdir(struct run_as_data *data, struct run_as_ret *ret_value) | |
460 | { | |
cbf53d23 | 461 | struct lttng_directory_handle *handle; |
93bed9fe | 462 | |
cbf53d23 JG |
463 | handle = lttng_directory_handle_create_from_dirfd(data->u.rmdir.dirfd); |
464 | if (!handle) { | |
465 | ret_value->u.ret = -1; | |
466 | ret_value->_errno = errno; | |
467 | ret_value->_error = true; | |
468 | goto end; | |
469 | } | |
93bed9fe JG |
470 | |
471 | /* Ownership of dirfd is transferred to the handle. */ | |
472 | data->u.rmdir.dirfd = -1; | |
473 | ||
474 | ret_value->u.ret = lttng_directory_handle_remove_subdirectory( | |
cbf53d23 | 475 | handle, data->u.rmdir.path); |
fe9f7760 | 476 | ret_value->_errno = errno; |
93bed9fe | 477 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
478 | lttng_directory_handle_put(handle); |
479 | end: | |
93bed9fe | 480 | return ret_value->u.ret; |
60b6c79c MD |
481 | } |
482 | ||
483 | static | |
fe9f7760 | 484 | int _rmdir_recursive(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 485 | { |
cbf53d23 | 486 | struct lttng_directory_handle *handle; |
93bed9fe | 487 | |
cbf53d23 JG |
488 | handle = lttng_directory_handle_create_from_dirfd(data->u.rmdir.dirfd); |
489 | if (!handle) { | |
490 | ret_value->u.ret = -1; | |
491 | ret_value->_errno = errno; | |
492 | ret_value->_error = true; | |
493 | goto end; | |
494 | } | |
93bed9fe JG |
495 | |
496 | /* Ownership of dirfd is transferred to the handle. */ | |
497 | data->u.rmdir.dirfd = -1; | |
498 | ||
499 | ret_value->u.ret = lttng_directory_handle_remove_subdirectory_recursive( | |
cbf53d23 | 500 | handle, data->u.rmdir.path, data->u.rmdir.flags); |
fe9f7760 | 501 | ret_value->_errno = errno; |
93bed9fe | 502 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
503 | lttng_directory_handle_put(handle); |
504 | end: | |
93bed9fe JG |
505 | return ret_value->u.ret; |
506 | } | |
507 | ||
508 | static | |
509 | int _rename(struct run_as_data *data, struct run_as_ret *ret_value) | |
510 | { | |
511 | const char *old_path, *new_path; | |
cbf53d23 | 512 | struct lttng_directory_handle *old_handle = NULL, *new_handle = NULL; |
93bed9fe JG |
513 | |
514 | old_path = data->u.rename.old_path; | |
515 | new_path = data->u.rename.new_path; | |
516 | ||
cbf53d23 | 517 | old_handle = lttng_directory_handle_create_from_dirfd( |
93bed9fe | 518 | data->u.rename.dirfds[0]); |
cbf53d23 JG |
519 | if (!old_handle) { |
520 | ret_value->u.ret = -1; | |
521 | goto end; | |
522 | } | |
523 | new_handle = lttng_directory_handle_create_from_dirfd( | |
93bed9fe | 524 | data->u.rename.dirfds[1]); |
cbf53d23 JG |
525 | if (!new_handle) { |
526 | ret_value->u.ret = -1; | |
527 | goto end; | |
528 | } | |
93bed9fe JG |
529 | |
530 | /* Ownership of dirfds are transferred to the handles. */ | |
531 | data->u.rename.dirfds[0] = data->u.rename.dirfds[1] = -1; | |
532 | ||
533 | /* Safe to call as we have transitioned to the requested uid/gid. */ | |
534 | ret_value->u.ret = lttng_directory_handle_rename( | |
cbf53d23 JG |
535 | old_handle, old_path, new_handle, new_path); |
536 | end: | |
537 | lttng_directory_handle_put(old_handle); | |
538 | lttng_directory_handle_put(new_handle); | |
93bed9fe JG |
539 | ret_value->_errno = errno; |
540 | ret_value->_error = (ret_value->u.ret) ? true : false; | |
93bed9fe | 541 | return ret_value->u.ret; |
7567352f | 542 | } |
df5b86c8 | 543 | |
b1b34226 | 544 | #ifdef HAVE_ELF_H |
241e0a5a FD |
545 | static |
546 | int _extract_elf_symbol_offset(struct run_as_data *data, | |
547 | struct run_as_ret *ret_value) | |
548 | { | |
549 | int ret = 0; | |
65eefd4c | 550 | uint64_t offset; |
241e0a5a | 551 | |
93bed9fe JG |
552 | ret_value->_error = false; |
553 | ret = lttng_elf_get_symbol_offset(data->u.extract_elf_symbol_offset.fd, | |
241e0a5a | 554 | data->u.extract_elf_symbol_offset.function, |
65eefd4c | 555 | &offset); |
241e0a5a FD |
556 | if (ret) { |
557 | DBG("Failed to extract ELF function offset"); | |
558 | ret_value->_error = true; | |
559 | } | |
65eefd4c | 560 | ret_value->u.extract_elf_symbol_offset.offset = offset; |
241e0a5a FD |
561 | |
562 | return ret; | |
563 | } | |
564 | ||
0ef03255 FD |
565 | static |
566 | int _extract_sdt_probe_offsets(struct run_as_data *data, | |
567 | struct run_as_ret *ret_value) | |
568 | { | |
569 | int ret = 0; | |
570 | uint64_t *offsets = NULL; | |
571 | uint32_t num_offset; | |
572 | ||
573 | ret_value->_error = false; | |
574 | ||
575 | /* On success, this call allocates the offsets paramater. */ | |
93bed9fe JG |
576 | ret = lttng_elf_get_sdt_probe_offsets( |
577 | data->u.extract_sdt_probe_offsets.fd, | |
0ef03255 FD |
578 | data->u.extract_sdt_probe_offsets.provider_name, |
579 | data->u.extract_sdt_probe_offsets.probe_name, | |
580 | &offsets, &num_offset); | |
581 | ||
582 | if (ret) { | |
583 | DBG("Failed to extract SDT probe offsets"); | |
584 | ret_value->_error = true; | |
585 | goto end; | |
586 | } | |
587 | ||
588 | if (num_offset <= 0 || num_offset > LTTNG_KERNEL_MAX_UPROBE_NUM) { | |
589 | DBG("Wrong number of probes."); | |
590 | ret = -1; | |
591 | ret_value->_error = true; | |
592 | goto free_offset; | |
593 | } | |
594 | ||
595 | /* Copy the content of the offsets array to the ret struct. */ | |
596 | memcpy(ret_value->u.extract_sdt_probe_offsets.offsets, | |
597 | offsets, num_offset * sizeof(uint64_t)); | |
598 | ||
599 | ret_value->u.extract_sdt_probe_offsets.num_offset = num_offset; | |
600 | ||
601 | free_offset: | |
602 | free(offsets); | |
603 | end: | |
604 | return ret; | |
605 | } | |
b1b34226 MJ |
606 | #else |
607 | static | |
608 | int _extract_elf_symbol_offset(struct run_as_data *data, | |
609 | struct run_as_ret *ret_value) | |
610 | { | |
611 | ERR("Unimplemented runas command RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET"); | |
612 | return -1; | |
613 | } | |
614 | ||
615 | static | |
616 | int _extract_sdt_probe_offsets(struct run_as_data *data, | |
617 | struct run_as_ret *ret_value) | |
618 | { | |
619 | ERR("Unimplemented runas command RUN_AS_EXTRACT_SDT_PROBE_OFFSETS"); | |
620 | return -1; | |
621 | } | |
622 | #endif | |
241e0a5a | 623 | |
7567352f MD |
624 | static |
625 | run_as_fct run_as_enum_to_fct(enum run_as_cmd cmd) | |
626 | { | |
627 | switch (cmd) { | |
628 | case RUN_AS_MKDIR: | |
18710679 JG |
629 | case RUN_AS_MKDIRAT: |
630 | return _mkdirat; | |
631 | case RUN_AS_MKDIR_RECURSIVE: | |
632 | case RUN_AS_MKDIRAT_RECURSIVE: | |
633 | return _mkdirat_recursive; | |
7567352f | 634 | case RUN_AS_OPEN: |
2912cead | 635 | case RUN_AS_OPENAT: |
7567352f MD |
636 | return _open; |
637 | case RUN_AS_UNLINK: | |
2912cead | 638 | case RUN_AS_UNLINKAT: |
7567352f | 639 | return _unlink; |
93bed9fe JG |
640 | case RUN_AS_RMDIR: |
641 | case RUN_AS_RMDIRAT: | |
642 | return _rmdir; | |
7567352f | 643 | case RUN_AS_RMDIR_RECURSIVE: |
93bed9fe | 644 | case RUN_AS_RMDIRAT_RECURSIVE: |
7567352f | 645 | return _rmdir_recursive; |
93bed9fe JG |
646 | case RUN_AS_RENAME: |
647 | case RUN_AS_RENAMEAT: | |
648 | return _rename; | |
241e0a5a FD |
649 | case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET: |
650 | return _extract_elf_symbol_offset; | |
0ef03255 FD |
651 | case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS: |
652 | return _extract_sdt_probe_offsets; | |
7567352f | 653 | default: |
62a7b8ed | 654 | ERR("Unknown command %d", (int) cmd); |
7567352f MD |
655 | return NULL; |
656 | } | |
60b6c79c MD |
657 | } |
658 | ||
4628484a | 659 | static |
93bed9fe | 660 | int do_send_fds(int sock, const int *fds, unsigned int fd_count) |
4628484a | 661 | { |
7567352f | 662 | ssize_t len; |
93bed9fe JG |
663 | unsigned int i; |
664 | ||
665 | for (i = 0; i < fd_count; i++) { | |
666 | if (fds[i] < 0) { | |
667 | ERR("Attempt to send invalid file descriptor to master (fd = %i)", | |
668 | fds[i]); | |
669 | /* Return 0 as this is not a fatal error. */ | |
670 | return 0; | |
671 | } | |
672 | } | |
4628484a | 673 | |
93bed9fe JG |
674 | len = lttcomm_send_fds_unix_sock(sock, fds, fd_count); |
675 | return len < 0 ? -1 : 0; | |
4628484a MD |
676 | } |
677 | ||
678 | static | |
93bed9fe | 679 | int do_recv_fds(int sock, int *fds, unsigned int fd_count) |
4628484a | 680 | { |
93bed9fe JG |
681 | int ret = 0; |
682 | unsigned int i; | |
7567352f | 683 | ssize_t len; |
4628484a | 684 | |
93bed9fe JG |
685 | len = lttcomm_recv_fds_unix_sock(sock, fds, fd_count); |
686 | if (len == 0) { | |
687 | ret = -1; | |
688 | goto end; | |
da9ee832 | 689 | } else if (len < 0) { |
93bed9fe JG |
690 | PERROR("Failed to receive file descriptors from socket"); |
691 | ret = -1; | |
692 | goto end; | |
ca9eb994 JG |
693 | } |
694 | ||
93bed9fe JG |
695 | for (i = 0; i < fd_count; i++) { |
696 | if (fds[i] < 0) { | |
697 | ERR("Invalid file descriptor received from worker (fd = %i)", fds[i]); | |
698 | /* Return 0 as this is not a fatal error. */ | |
699 | } | |
700 | } | |
701 | end: | |
702 | return ret; | |
4628484a MD |
703 | } |
704 | ||
fe9f7760 | 705 | static |
93bed9fe JG |
706 | int send_fds_to_worker(const struct run_as_worker *worker, |
707 | const struct run_as_data *data) | |
fe9f7760 FD |
708 | { |
709 | int ret = 0; | |
93bed9fe | 710 | unsigned int i; |
fe9f7760 | 711 | |
93bed9fe JG |
712 | if (COMMAND_USE_CWD_FD(data) || COMMAND_IN_FD_COUNT(data) == 0) { |
713 | goto end; | |
fe9f7760 FD |
714 | } |
715 | ||
93bed9fe JG |
716 | for (i = 0; i < COMMAND_IN_FD_COUNT(data); i++) { |
717 | if (COMMAND_IN_FDS(data)[i] < 0) { | |
718 | ERR("Refusing to send invalid fd to worker (fd = %i)", | |
719 | COMMAND_IN_FDS(data)[i]); | |
720 | ret = -1; | |
721 | goto end; | |
722 | } | |
723 | } | |
ca9eb994 | 724 | |
93bed9fe JG |
725 | ret = do_send_fds(worker->sockpair[0], COMMAND_IN_FDS(data), |
726 | COMMAND_IN_FD_COUNT(data)); | |
fe9f7760 | 727 | if (ret < 0) { |
93bed9fe | 728 | PERROR("Failed to send file descriptor to run-as worker"); |
fe9f7760 | 729 | ret = -1; |
93bed9fe | 730 | goto end; |
fe9f7760 | 731 | } |
93bed9fe | 732 | end: |
fe9f7760 FD |
733 | return ret; |
734 | } | |
735 | ||
736 | static | |
93bed9fe JG |
737 | int send_fds_to_master(struct run_as_worker *worker, enum run_as_cmd cmd, |
738 | struct run_as_ret *run_as_ret) | |
fe9f7760 | 739 | { |
93bed9fe JG |
740 | int ret = 0; |
741 | unsigned int i; | |
fe9f7760 | 742 | |
93bed9fe JG |
743 | if (COMMAND_OUT_FD_COUNT(cmd) == 0) { |
744 | goto end; | |
fe9f7760 FD |
745 | } |
746 | ||
93bed9fe JG |
747 | ret = do_send_fds(worker->sockpair[1], COMMAND_OUT_FDS(cmd, run_as_ret), |
748 | COMMAND_OUT_FD_COUNT(cmd)); | |
fe9f7760 | 749 | if (ret < 0) { |
93bed9fe JG |
750 | PERROR("Failed to send file descriptor to master process"); |
751 | goto end; | |
fe9f7760 FD |
752 | } |
753 | ||
93bed9fe JG |
754 | for (i = 0; i < COMMAND_OUT_FD_COUNT(cmd); i++) { |
755 | int ret_close = close(COMMAND_OUT_FDS(cmd, run_as_ret)[i]); | |
ca9eb994 | 756 | |
93bed9fe JG |
757 | if (ret_close < 0) { |
758 | PERROR("Failed to close result file descriptor"); | |
759 | } | |
760 | } | |
761 | end: | |
fe9f7760 FD |
762 | return ret; |
763 | } | |
764 | ||
765 | static | |
93bed9fe JG |
766 | int recv_fds_from_worker(const struct run_as_worker *worker, enum run_as_cmd cmd, |
767 | struct run_as_ret *run_as_ret) | |
fe9f7760 FD |
768 | { |
769 | int ret = 0; | |
770 | ||
93bed9fe JG |
771 | if (COMMAND_OUT_FD_COUNT(cmd) == 0) { |
772 | goto end; | |
fe9f7760 FD |
773 | } |
774 | ||
93bed9fe JG |
775 | ret = do_recv_fds(worker->sockpair[0], COMMAND_OUT_FDS(cmd, run_as_ret), |
776 | COMMAND_OUT_FD_COUNT(cmd)); | |
fe9f7760 | 777 | if (ret < 0) { |
93bed9fe | 778 | PERROR("Failed to receive file descriptor from run-as worker"); |
fe9f7760 FD |
779 | ret = -1; |
780 | } | |
93bed9fe | 781 | end: |
fe9f7760 FD |
782 | return ret; |
783 | } | |
784 | ||
785 | static | |
93bed9fe | 786 | int recv_fds_from_master(struct run_as_worker *worker, struct run_as_data *data) |
fe9f7760 FD |
787 | { |
788 | int ret = 0; | |
789 | ||
93bed9fe JG |
790 | if (COMMAND_USE_CWD_FD(data)) { |
791 | unsigned int i; | |
792 | ||
793 | for (i = 0; i < COMMAND_IN_FD_COUNT(data); i++) { | |
794 | COMMAND_IN_FDS(data)[i] = AT_FDCWD; | |
795 | } | |
796 | goto end; | |
fe9f7760 FD |
797 | } |
798 | ||
93bed9fe JG |
799 | ret = do_recv_fds(worker->sockpair[1], COMMAND_IN_FDS(data), |
800 | COMMAND_IN_FD_COUNT(data)); | |
fe9f7760 | 801 | if (ret < 0) { |
93bed9fe | 802 | PERROR("Failed to receive file descriptors from master process"); |
fe9f7760 FD |
803 | ret = -1; |
804 | } | |
93bed9fe | 805 | end: |
fe9f7760 FD |
806 | return ret; |
807 | } | |
808 | ||
809 | static | |
93bed9fe | 810 | int cleanup_received_fds(struct run_as_data *data) |
fe9f7760 | 811 | { |
93bed9fe | 812 | int ret = 0, i; |
fe9f7760 | 813 | |
93bed9fe JG |
814 | for (i = 0; i < COMMAND_IN_FD_COUNT(data); i++) { |
815 | if (COMMAND_IN_FDS(data)[i] == -1) { | |
816 | continue; | |
817 | } | |
818 | ret = close(COMMAND_IN_FDS(data)[i]); | |
819 | if (ret) { | |
820 | PERROR("Failed to close file descriptor received fd in run-as worker"); | |
821 | goto end; | |
822 | } | |
fe9f7760 | 823 | } |
93bed9fe | 824 | end: |
fe9f7760 FD |
825 | return ret; |
826 | } | |
0ef03255 | 827 | |
a62bbe8c FD |
828 | static int get_user_infos_from_uid( |
829 | uid_t uid, char **username, gid_t *primary_gid) | |
830 | { | |
831 | int ret; | |
832 | char *buf = NULL; | |
c043a8d8 FD |
833 | long raw_get_pw_buf_size; |
834 | size_t get_pw_buf_size; | |
a62bbe8c FD |
835 | struct passwd pwd; |
836 | struct passwd *result = NULL; | |
837 | ||
838 | /* Fetch the max size for the temporary buffer. */ | |
839 | errno = 0; | |
c043a8d8 FD |
840 | raw_get_pw_buf_size = sysconf(_SC_GETPW_R_SIZE_MAX); |
841 | if (raw_get_pw_buf_size < 0) { | |
a62bbe8c FD |
842 | if (errno != 0) { |
843 | PERROR("Failed to query _SC_GETPW_R_SIZE_MAX"); | |
844 | goto error; | |
845 | } | |
846 | ||
847 | /* Limit is indeterminate. */ | |
848 | WARN("Failed to query _SC_GETPW_R_SIZE_MAX as it is " | |
849 | "indeterminate; falling back to default buffer size"); | |
c043a8d8 | 850 | raw_get_pw_buf_size = GETPW_BUFFER_FALLBACK_SIZE; |
a62bbe8c FD |
851 | } |
852 | ||
c043a8d8 FD |
853 | get_pw_buf_size = (size_t) raw_get_pw_buf_size; |
854 | ||
855 | buf = zmalloc(get_pw_buf_size); | |
a62bbe8c FD |
856 | if (buf == NULL) { |
857 | PERROR("Failed to allocate buffer to get password file entries"); | |
858 | goto error; | |
859 | } | |
860 | ||
c043a8d8 | 861 | ret = getpwuid_r(uid, &pwd, buf, get_pw_buf_size, &result); |
a62bbe8c FD |
862 | if (ret < 0) { |
863 | PERROR("Failed to get user information for user: uid = %d", | |
864 | (int) uid); | |
865 | goto error; | |
866 | } | |
867 | ||
868 | if (result == NULL) { | |
869 | ERR("Failed to find user information in password entries: uid = %d", | |
870 | (int) uid); | |
871 | ret = -1; | |
872 | goto error; | |
873 | } | |
874 | ||
875 | *username = strdup(result->pw_name); | |
876 | if (*username == NULL) { | |
877 | PERROR("Failed to copy user name"); | |
878 | goto error; | |
879 | } | |
880 | ||
881 | *primary_gid = result->pw_gid; | |
882 | ||
883 | end: | |
884 | free(buf); | |
885 | return ret; | |
886 | error: | |
887 | *username = NULL; | |
888 | *primary_gid = -1; | |
889 | ret = -1; | |
890 | goto end; | |
891 | } | |
892 | ||
893 | static int demote_creds( | |
894 | uid_t prev_uid, gid_t prev_gid, uid_t new_uid, gid_t new_gid) | |
895 | { | |
896 | int ret = 0; | |
897 | gid_t primary_gid; | |
898 | char *username = NULL; | |
899 | ||
900 | /* Change the group id. */ | |
901 | if (prev_gid != new_gid) { | |
902 | ret = setegid(new_gid); | |
903 | if (ret < 0) { | |
904 | PERROR("Failed to set effective group id: new_gid = %d", | |
905 | (int) new_gid); | |
906 | goto end; | |
907 | } | |
908 | } | |
909 | ||
910 | /* Change the user id. */ | |
911 | if (prev_uid != new_uid) { | |
912 | ret = get_user_infos_from_uid(new_uid, &username, &primary_gid); | |
913 | if (ret < 0) { | |
914 | goto end; | |
915 | } | |
916 | ||
917 | /* | |
918 | * Initialize the supplementary group access list. | |
919 | * | |
920 | * This is needed to handle cases where the supplementary groups | |
921 | * of the user the process is demoting-to would give it access | |
922 | * to a given file/folder, but not it's primary group. | |
923 | * | |
924 | * e.g | |
925 | * username: User1 | |
926 | * Primary Group: User1 | |
927 | * Secondary group: Disk, Network | |
928 | * | |
929 | * mkdir inside the following directory must work since User1 | |
930 | * is part of the Network group. | |
931 | * | |
932 | * drwxrwx--- 2 root Network 4096 Jul 23 17:17 /tmp/my_folder/ | |
933 | * | |
934 | * | |
935 | * The order of the following initgroups and seteuid calls is | |
936 | * important here; | |
937 | * Only a root process or one with CAP_SETGID capability can | |
938 | * call the the initgroups() function. We must initialize the | |
939 | * supplementary groups before we change the effective | |
940 | * UID to a less-privileged user. | |
941 | */ | |
942 | ret = initgroups(username, primary_gid); | |
943 | if (ret < 0) { | |
944 | PERROR("Failed to init the supplementary group access list: " | |
945 | "username = `%s`, primary gid = %d", username, | |
946 | (int) primary_gid); | |
947 | goto end; | |
948 | } | |
949 | ||
950 | ret = seteuid(new_uid); | |
951 | if (ret < 0) { | |
952 | PERROR("Failed to set effective user id: new_uid = %d", | |
953 | (int) new_uid); | |
954 | goto end; | |
955 | } | |
956 | } | |
957 | end: | |
958 | free(username); | |
959 | return ret; | |
960 | } | |
961 | ||
962 | static int promote_creds( | |
963 | uid_t prev_uid, gid_t prev_gid, uid_t new_uid, gid_t new_gid) | |
964 | { | |
965 | int ret = 0; | |
966 | gid_t primary_gid; | |
967 | char *username = NULL; | |
968 | ||
969 | /* Change the group id. */ | |
970 | if (prev_gid != new_gid) { | |
971 | ret = setegid(new_gid); | |
972 | if (ret < 0) { | |
973 | PERROR("Failed to set effective group id: new_gid = %d", | |
974 | (int) new_gid); | |
975 | goto end; | |
976 | } | |
977 | } | |
978 | ||
979 | /* Change the user id. */ | |
980 | if (prev_uid != new_uid) { | |
981 | ret = get_user_infos_from_uid(new_uid, &username, &primary_gid); | |
982 | if (ret < 0) { | |
983 | goto end; | |
984 | } | |
985 | ||
986 | /* | |
987 | * seteuid call must be done before the initgroups call because | |
988 | * we need to be privileged (CAP_SETGID) to call initgroups(). | |
989 | */ | |
990 | ret = seteuid(new_uid); | |
991 | if (ret < 0) { | |
992 | PERROR("Failed to set effective user id: new_uid = %d", | |
993 | (int) new_uid); | |
994 | goto end; | |
995 | } | |
996 | ||
997 | /* | |
998 | * Initialize the supplementary group access list. | |
999 | * | |
1000 | * There is a possibility the groups we set in the following | |
1001 | * initgroups() call are not exactly the same as the ones we | |
1002 | * had when we originally demoted. This can happen if the | |
1003 | * /etc/group file is modified after the runas process is | |
1004 | * forked. This is very unlikely. | |
1005 | */ | |
1006 | ret = initgroups(username, primary_gid); | |
1007 | if (ret < 0) { | |
1008 | PERROR("Failed to init the supplementary group access " | |
1009 | "list: username = `%s`, primary gid = %d", | |
1010 | username, (int) primary_gid) | |
1011 | goto end; | |
1012 | } | |
1013 | } | |
1014 | end: | |
1015 | free(username); | |
1016 | return ret; | |
1017 | } | |
1018 | ||
7567352f MD |
1019 | /* |
1020 | * Return < 0 on error, 0 if OK, 1 on hangup. | |
1021 | */ | |
c2b75c49 | 1022 | static |
7567352f | 1023 | int handle_one_cmd(struct run_as_worker *worker) |
c2b75c49 | 1024 | { |
a62bbe8c FD |
1025 | int ret = 0, promote_ret; |
1026 | struct run_as_data data = {}; | |
1027 | ssize_t readlen, writelen; | |
1028 | struct run_as_ret sendret = {}; | |
1029 | run_as_fct cmd; | |
1030 | uid_t prev_ruid; | |
1031 | gid_t prev_rgid; | |
7567352f | 1032 | |
fe9f7760 FD |
1033 | /* |
1034 | * Stage 1: Receive run_as_data struct from the master. | |
1035 | * The structure contains the command type and all the parameters needed for | |
1036 | * its execution | |
1037 | */ | |
7567352f MD |
1038 | readlen = lttcomm_recv_unix_sock(worker->sockpair[1], &data, |
1039 | sizeof(data)); | |
1040 | if (readlen == 0) { | |
1041 | /* hang up */ | |
1042 | ret = 1; | |
1043 | goto end; | |
1044 | } | |
1045 | if (readlen < sizeof(data)) { | |
1046 | PERROR("lttcomm_recv_unix_sock error"); | |
1047 | ret = -1; | |
1048 | goto end; | |
1049 | } | |
c2b75c49 | 1050 | |
7567352f MD |
1051 | cmd = run_as_enum_to_fct(data.cmd); |
1052 | if (!cmd) { | |
1053 | ret = -1; | |
1054 | goto end; | |
1055 | } | |
1056 | ||
fe9f7760 FD |
1057 | /* |
1058 | * Stage 2: Receive file descriptor from master. | |
1059 | * Some commands need a file descriptor as input so if it's needed we | |
1060 | * receive the fd using the Unix socket. | |
1061 | */ | |
93bed9fe | 1062 | ret = recv_fds_from_master(worker, &data); |
fe9f7760 FD |
1063 | if (ret < 0) { |
1064 | PERROR("recv_fd_from_master error"); | |
1065 | ret = -1; | |
1066 | goto end; | |
1067 | } | |
1068 | ||
a62bbe8c FD |
1069 | prev_ruid = getuid(); |
1070 | prev_rgid = getgid(); | |
1071 | ||
1072 | ret = demote_creds(prev_ruid, prev_rgid, data.uid, data.gid); | |
1073 | if (ret < 0) { | |
1074 | goto write_return; | |
c2b75c49 | 1075 | } |
fe9f7760 | 1076 | |
c2b75c49 MD |
1077 | /* |
1078 | * Also set umask to 0 for mkdir executable bit. | |
1079 | */ | |
1080 | umask(0); | |
fe9f7760 FD |
1081 | |
1082 | /* | |
1083 | * Stage 3: Execute the command | |
1084 | */ | |
1085 | ret = (*cmd)(&data, &sendret); | |
1086 | if (ret < 0) { | |
1087 | DBG("Execution of command returned an error"); | |
1088 | } | |
6d73c4ef MD |
1089 | |
1090 | write_return: | |
93bed9fe | 1091 | ret = cleanup_received_fds(&data); |
fe9f7760 FD |
1092 | if (ret < 0) { |
1093 | ERR("Error cleaning up FD"); | |
a62bbe8c | 1094 | goto promote_back; |
fe9f7760 FD |
1095 | } |
1096 | ||
1097 | /* | |
1098 | * Stage 4: Send run_as_ret structure to the master. | |
1099 | * This structure contain the return value of the command and the errno. | |
1100 | */ | |
7567352f MD |
1101 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, |
1102 | sizeof(sendret)); | |
6cd525e8 | 1103 | if (writelen < sizeof(sendret)) { |
7567352f MD |
1104 | PERROR("lttcomm_send_unix_sock error"); |
1105 | ret = -1; | |
a62bbe8c | 1106 | goto promote_back; |
7567352f | 1107 | } |
fe9f7760 FD |
1108 | |
1109 | /* | |
93bed9fe | 1110 | * Stage 5: Send resulting file descriptors to the master. |
fe9f7760 | 1111 | */ |
93bed9fe | 1112 | ret = send_fds_to_master(worker, data.cmd, &sendret); |
fe9f7760 FD |
1113 | if (ret < 0) { |
1114 | DBG("Sending FD to master returned an error"); | |
7567352f | 1115 | } |
fe9f7760 | 1116 | |
7567352f | 1117 | ret = 0; |
a62bbe8c FD |
1118 | |
1119 | promote_back: | |
1120 | /* Return to previous uid/gid. */ | |
1121 | promote_ret = promote_creds(data.uid, data.gid, prev_ruid, prev_rgid); | |
1122 | if (promote_ret < 0) { | |
1123 | ERR("Failed to promote back to the initial credentials"); | |
1124 | } | |
1125 | ||
7567352f MD |
1126 | end: |
1127 | return ret; | |
1128 | } | |
1129 | ||
1130 | static | |
1131 | int run_as_worker(struct run_as_worker *worker) | |
1132 | { | |
1133 | int ret; | |
1134 | ssize_t writelen; | |
1135 | struct run_as_ret sendret; | |
1136 | size_t proc_orig_len; | |
1137 | ||
1138 | /* | |
1139 | * Initialize worker. Set a different process cmdline. | |
1140 | */ | |
1141 | proc_orig_len = strlen(worker->procname); | |
1142 | memset(worker->procname, 0, proc_orig_len); | |
1143 | strncpy(worker->procname, DEFAULT_RUN_AS_WORKER_NAME, proc_orig_len); | |
1144 | ||
e1055edb JG |
1145 | ret = lttng_prctl(PR_SET_NAME, |
1146 | (unsigned long) DEFAULT_RUN_AS_WORKER_NAME, 0, 0, 0); | |
1147 | if (ret && ret != -ENOSYS) { | |
b8090274 JG |
1148 | /* Don't fail as this is not essential. */ |
1149 | PERROR("prctl PR_SET_NAME"); | |
6cd525e8 | 1150 | } |
7567352f | 1151 | |
fe9f7760 FD |
1152 | memset(&sendret, 0, sizeof(sendret)); |
1153 | ||
7567352f MD |
1154 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, |
1155 | sizeof(sendret)); | |
1156 | if (writelen < sizeof(sendret)) { | |
1157 | PERROR("lttcomm_send_unix_sock error"); | |
1158 | ret = EXIT_FAILURE; | |
1159 | goto end; | |
1160 | } | |
1161 | ||
1162 | for (;;) { | |
1163 | ret = handle_one_cmd(worker); | |
1164 | if (ret < 0) { | |
1165 | ret = EXIT_FAILURE; | |
1166 | goto end; | |
1167 | } else if (ret > 0) { | |
1168 | break; | |
1169 | } else { | |
1170 | continue; /* Next command. */ | |
1171 | } | |
1172 | } | |
1173 | ret = EXIT_SUCCESS; | |
1174 | end: | |
1175 | return ret; | |
c2b75c49 MD |
1176 | } |
1177 | ||
60b6c79c | 1178 | static |
7567352f MD |
1179 | int run_as_cmd(struct run_as_worker *worker, |
1180 | enum run_as_cmd cmd, | |
1181 | struct run_as_data *data, | |
fe9f7760 | 1182 | struct run_as_ret *ret_value, |
7567352f | 1183 | uid_t uid, gid_t gid) |
60b6c79c | 1184 | { |
fe9f7760 | 1185 | int ret = 0; |
7567352f | 1186 | ssize_t readlen, writelen; |
60b6c79c MD |
1187 | |
1188 | /* | |
1189 | * If we are non-root, we can only deal with our own uid. | |
1190 | */ | |
1191 | if (geteuid() != 0) { | |
1192 | if (uid != geteuid()) { | |
fe9f7760 FD |
1193 | ret = -1; |
1194 | ret_value->_errno = EPERM; | |
60b6c79c | 1195 | ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)", |
08797918 | 1196 | (int) uid, (int) geteuid()); |
df5b86c8 | 1197 | goto end; |
60b6c79c | 1198 | } |
60b6c79c MD |
1199 | } |
1200 | ||
7567352f MD |
1201 | data->cmd = cmd; |
1202 | data->uid = uid; | |
1203 | data->gid = gid; | |
1204 | ||
fe9f7760 FD |
1205 | /* |
1206 | * Stage 1: Send the run_as_data struct to the worker process | |
1207 | */ | |
7567352f MD |
1208 | writelen = lttcomm_send_unix_sock(worker->sockpair[0], data, |
1209 | sizeof(*data)); | |
1210 | if (writelen < sizeof(*data)) { | |
1211 | PERROR("Error writing message to run_as"); | |
fe9f7760 FD |
1212 | ret = -1; |
1213 | ret_value->_errno = EIO; | |
60b6c79c | 1214 | goto end; |
c2b75c49 | 1215 | } |
7567352f | 1216 | |
fe9f7760 FD |
1217 | /* |
1218 | * Stage 2: Send file descriptor to the worker process if needed | |
1219 | */ | |
93bed9fe | 1220 | ret = send_fds_to_worker(worker, data); |
fe9f7760 FD |
1221 | if (ret) { |
1222 | PERROR("do_send_fd error"); | |
1223 | ret = -1; | |
1224 | ret_value->_errno = EIO; | |
1225 | goto end; | |
1226 | } | |
1227 | ||
1228 | /* | |
1229 | * Stage 3: Wait for the execution of the command | |
1230 | */ | |
1231 | ||
1232 | /* | |
1233 | * Stage 4: Receive the run_as_ret struct containing the return value and | |
1234 | * errno | |
1235 | */ | |
1236 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], ret_value, | |
1237 | sizeof(*ret_value)); | |
da9ee832 JG |
1238 | if (!readlen) { |
1239 | ERR("Run-as worker has hung-up during run_as_cmd"); | |
fe9f7760 FD |
1240 | ret = -1; |
1241 | ret_value->_errno = EIO; | |
da9ee832 | 1242 | goto end; |
fe9f7760 | 1243 | } else if (readlen < sizeof(*ret_value)) { |
7567352f | 1244 | PERROR("Error reading response from run_as"); |
fe9f7760 FD |
1245 | ret = -1; |
1246 | ret_value->_errno = errno; | |
033b58a7 | 1247 | goto end; |
6cd525e8 | 1248 | } |
fe9f7760 | 1249 | |
ca9eb994 JG |
1250 | if (ret_value->_error) { |
1251 | /* Skip stage 5 on error as there will be no fd to receive. */ | |
1252 | goto end; | |
1253 | } | |
1254 | ||
fe9f7760 FD |
1255 | /* |
1256 | * Stage 5: Receive file descriptor if needed | |
1257 | */ | |
93bed9fe | 1258 | ret = recv_fds_from_worker(worker, cmd, ret_value); |
fe9f7760 FD |
1259 | if (ret < 0) { |
1260 | ERR("Error receiving fd"); | |
1261 | ret = -1; | |
1262 | ret_value->_errno = EIO; | |
4c462e79 | 1263 | } |
7567352f | 1264 | |
60b6c79c | 1265 | end: |
fe9f7760 | 1266 | return ret; |
60b6c79c MD |
1267 | } |
1268 | ||
2d85a600 | 1269 | /* |
7567352f | 1270 | * This is for debugging ONLY and should not be considered secure. |
2d85a600 MD |
1271 | */ |
1272 | static | |
fe9f7760 FD |
1273 | int run_as_noworker(enum run_as_cmd cmd, |
1274 | struct run_as_data *data, struct run_as_ret *ret_value, | |
1275 | uid_t uid, gid_t gid) | |
2d85a600 | 1276 | { |
df5b86c8 | 1277 | int ret, saved_errno; |
5b73926f | 1278 | mode_t old_mask; |
7567352f | 1279 | run_as_fct fct; |
5b73926f | 1280 | |
7567352f MD |
1281 | fct = run_as_enum_to_fct(cmd); |
1282 | if (!fct) { | |
1283 | errno = -ENOSYS; | |
1284 | ret = -1; | |
1285 | goto end; | |
1286 | } | |
5b73926f | 1287 | old_mask = umask(0); |
fe9f7760 FD |
1288 | ret = fct(data, ret_value); |
1289 | saved_errno = ret_value->_errno; | |
5b73926f | 1290 | umask(old_mask); |
df5b86c8 | 1291 | errno = saved_errno; |
7567352f | 1292 | end: |
5b73926f | 1293 | return ret; |
2d85a600 MD |
1294 | } |
1295 | ||
8fec83ea JG |
1296 | static |
1297 | int reset_sighandler(void) | |
1298 | { | |
1299 | int sig; | |
1300 | ||
1301 | DBG("Resetting run_as worker signal handlers to default"); | |
1302 | for (sig = 1; sig <= 31; sig++) { | |
1303 | (void) signal(sig, SIG_DFL); | |
1304 | } | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | static | |
1309 | void worker_sighandler(int sig) | |
1310 | { | |
1311 | const char *signame; | |
1312 | ||
1313 | /* | |
1314 | * The worker will inherit its parent's signals since they are part of | |
1315 | * the same process group. However, in the case of SIGINT and SIGTERM, | |
1316 | * we want to give the worker a chance to teardown gracefully when its | |
1317 | * parent closes the command socket. | |
1318 | */ | |
1319 | switch (sig) { | |
1320 | case SIGINT: | |
1321 | signame = "SIGINT"; | |
1322 | break; | |
1323 | case SIGTERM: | |
1324 | signame = "SIGTERM"; | |
1325 | break; | |
1326 | default: | |
1327 | signame = NULL; | |
1328 | } | |
1329 | ||
1330 | if (signame) { | |
1331 | DBG("run_as worker received signal %s", signame); | |
1332 | } else { | |
1333 | DBG("run_as_worker received signal %d", sig); | |
1334 | } | |
1335 | } | |
1336 | ||
1337 | static | |
1338 | int set_worker_sighandlers(void) | |
1339 | { | |
1340 | int ret = 0; | |
1341 | sigset_t sigset; | |
1342 | struct sigaction sa; | |
1343 | ||
1344 | if ((ret = sigemptyset(&sigset)) < 0) { | |
1345 | PERROR("sigemptyset"); | |
1346 | goto end; | |
1347 | } | |
1348 | ||
1349 | sa.sa_handler = worker_sighandler; | |
1350 | sa.sa_mask = sigset; | |
1351 | sa.sa_flags = 0; | |
1352 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
1353 | PERROR("sigaction SIGINT"); | |
1354 | goto end; | |
1355 | } | |
1356 | ||
1357 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
1358 | PERROR("sigaction SIGTERM"); | |
1359 | goto end; | |
1360 | } | |
1361 | ||
1362 | DBG("run_as signal handler set for SIGTERM and SIGINT"); | |
1363 | end: | |
1364 | return ret; | |
1365 | } | |
1366 | ||
1367 | static | |
929f71ec JG |
1368 | int run_as_create_worker_no_lock(const char *procname, |
1369 | post_fork_cleanup_cb clean_up_func, | |
1370 | void *clean_up_user_data) | |
8fec83ea JG |
1371 | { |
1372 | pid_t pid; | |
1373 | int i, ret = 0; | |
1374 | ssize_t readlen; | |
1375 | struct run_as_ret recvret; | |
1376 | struct run_as_worker *worker; | |
1377 | ||
1378 | assert(!global_worker); | |
1379 | if (!use_clone()) { | |
1380 | /* | |
1381 | * Don't initialize a worker, all run_as tasks will be performed | |
1382 | * in the current process. | |
1383 | */ | |
1384 | ret = 0; | |
1385 | goto end; | |
1386 | } | |
1387 | worker = zmalloc(sizeof(*worker)); | |
1388 | if (!worker) { | |
1389 | ret = -ENOMEM; | |
1390 | goto end; | |
1391 | } | |
1392 | worker->procname = strdup(procname); | |
1393 | if (!worker->procname) { | |
1394 | ret = -ENOMEM; | |
8c96eded | 1395 | goto error_procname_alloc; |
8fec83ea JG |
1396 | } |
1397 | /* Create unix socket. */ | |
1398 | if (lttcomm_create_anon_unix_socketpair(worker->sockpair) < 0) { | |
1399 | ret = -1; | |
1400 | goto error_sock; | |
1401 | } | |
1402 | ||
1403 | /* Fork worker. */ | |
1404 | pid = fork(); | |
1405 | if (pid < 0) { | |
1406 | PERROR("fork"); | |
1407 | ret = -1; | |
1408 | goto error_fork; | |
1409 | } else if (pid == 0) { | |
1410 | /* Child */ | |
1411 | ||
1412 | reset_sighandler(); | |
1413 | ||
1414 | set_worker_sighandlers(); | |
929f71ec JG |
1415 | if (clean_up_func) { |
1416 | if (clean_up_func(clean_up_user_data) < 0) { | |
1417 | ERR("Run-as post-fork clean-up failed, exiting."); | |
1418 | exit(EXIT_FAILURE); | |
1419 | } | |
1420 | } | |
8fec83ea JG |
1421 | |
1422 | /* Just close, no shutdown. */ | |
1423 | if (close(worker->sockpair[0])) { | |
1424 | PERROR("close"); | |
1425 | exit(EXIT_FAILURE); | |
1426 | } | |
1427 | ||
1428 | /* | |
1429 | * Close all FDs aside from STDIN, STDOUT, STDERR and sockpair[1] | |
1430 | * Sockpair[1] is used as a control channel with the master | |
1431 | */ | |
1432 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
1433 | if (i != worker->sockpair[1]) { | |
1434 | (void) close(i); | |
1435 | } | |
1436 | } | |
1437 | ||
1438 | worker->sockpair[0] = -1; | |
1439 | ret = run_as_worker(worker); | |
1440 | if (lttcomm_close_unix_sock(worker->sockpair[1])) { | |
1441 | PERROR("close"); | |
1442 | ret = -1; | |
1443 | } | |
1444 | worker->sockpair[1] = -1; | |
340cf672 JG |
1445 | free(worker->procname); |
1446 | free(worker); | |
8fec83ea JG |
1447 | LOG(ret ? PRINT_ERR : PRINT_DBG, "run_as worker exiting (ret = %d)", ret); |
1448 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
1449 | } else { | |
1450 | /* Parent */ | |
1451 | ||
1452 | /* Just close, no shutdown. */ | |
1453 | if (close(worker->sockpair[1])) { | |
1454 | PERROR("close"); | |
1455 | ret = -1; | |
1456 | goto error_fork; | |
1457 | } | |
1458 | worker->sockpair[1] = -1; | |
1459 | worker->pid = pid; | |
1460 | /* Wait for worker to become ready. */ | |
1461 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], | |
1462 | &recvret, sizeof(recvret)); | |
1463 | if (readlen < sizeof(recvret)) { | |
1464 | ERR("readlen: %zd", readlen); | |
1465 | PERROR("Error reading response from run_as at creation"); | |
1466 | ret = -1; | |
1467 | goto error_fork; | |
1468 | } | |
1469 | global_worker = worker; | |
1470 | } | |
1471 | end: | |
1472 | return ret; | |
1473 | ||
1474 | /* Error handling. */ | |
1475 | error_fork: | |
1476 | for (i = 0; i < 2; i++) { | |
1477 | if (worker->sockpair[i] < 0) { | |
1478 | continue; | |
1479 | } | |
1480 | if (lttcomm_close_unix_sock(worker->sockpair[i])) { | |
1481 | PERROR("close"); | |
1482 | } | |
1483 | worker->sockpair[i] = -1; | |
1484 | } | |
1485 | error_sock: | |
8c96eded FD |
1486 | free(worker->procname); |
1487 | error_procname_alloc: | |
8fec83ea JG |
1488 | free(worker); |
1489 | return ret; | |
1490 | } | |
1491 | ||
a01c682b JR |
1492 | static |
1493 | void run_as_destroy_worker_no_lock(void) | |
1494 | { | |
1495 | struct run_as_worker *worker = global_worker; | |
1496 | ||
1497 | DBG("Destroying run_as worker"); | |
1498 | if (!worker) { | |
1499 | return; | |
1500 | } | |
1501 | /* Close unix socket */ | |
1502 | DBG("Closing run_as worker socket"); | |
1503 | if (lttcomm_close_unix_sock(worker->sockpair[0])) { | |
1504 | PERROR("close"); | |
1505 | } | |
1506 | worker->sockpair[0] = -1; | |
1507 | /* Wait for worker. */ | |
1508 | for (;;) { | |
1509 | int status; | |
1510 | pid_t wait_ret; | |
1511 | ||
1512 | wait_ret = waitpid(worker->pid, &status, 0); | |
1513 | if (wait_ret < 0) { | |
1514 | if (errno == EINTR) { | |
1515 | continue; | |
1516 | } | |
1517 | PERROR("waitpid"); | |
1518 | break; | |
1519 | } | |
1520 | ||
1521 | if (WIFEXITED(status)) { | |
1522 | LOG(WEXITSTATUS(status) == 0 ? PRINT_DBG : PRINT_ERR, | |
1523 | DEFAULT_RUN_AS_WORKER_NAME " terminated with status code %d", | |
1524 | WEXITSTATUS(status)); | |
1525 | break; | |
1526 | } else if (WIFSIGNALED(status)) { | |
1527 | ERR(DEFAULT_RUN_AS_WORKER_NAME " was killed by signal %d", | |
1528 | WTERMSIG(status)); | |
1529 | break; | |
1530 | } | |
1531 | } | |
1532 | free(worker->procname); | |
1533 | free(worker); | |
1534 | global_worker = NULL; | |
1535 | } | |
1536 | ||
2d85a600 | 1537 | static |
fe9f7760 | 1538 | int run_as_restart_worker(struct run_as_worker *worker) |
2d85a600 | 1539 | { |
fe9f7760 FD |
1540 | int ret = 0; |
1541 | char *procname = NULL; | |
1542 | ||
1543 | procname = worker->procname; | |
1544 | ||
1545 | /* Close socket to run_as worker process and clean up the zombie process */ | |
a01c682b | 1546 | run_as_destroy_worker_no_lock(); |
fe9f7760 FD |
1547 | |
1548 | /* Create a new run_as worker process*/ | |
929f71ec | 1549 | ret = run_as_create_worker_no_lock(procname, NULL, NULL); |
fe9f7760 FD |
1550 | if (ret < 0 ) { |
1551 | ERR("Restarting the worker process failed"); | |
1552 | ret = -1; | |
1553 | goto err; | |
1554 | } | |
1555 | err: | |
1556 | return ret; | |
1557 | } | |
1558 | ||
1559 | static | |
1560 | int run_as(enum run_as_cmd cmd, struct run_as_data *data, | |
1561 | struct run_as_ret *ret_value, uid_t uid, gid_t gid) | |
1562 | { | |
1563 | int ret, saved_errno; | |
7567352f | 1564 | |
8fec83ea | 1565 | pthread_mutex_lock(&worker_lock); |
749b7a0c | 1566 | if (use_clone()) { |
7567352f | 1567 | DBG("Using run_as worker"); |
8fec83ea | 1568 | |
749b7a0c | 1569 | assert(global_worker); |
749b7a0c | 1570 | |
fe9f7760 FD |
1571 | ret = run_as_cmd(global_worker, cmd, data, ret_value, uid, gid); |
1572 | saved_errno = ret_value->_errno; | |
1573 | ||
fe9f7760 FD |
1574 | /* |
1575 | * If the worker thread crashed the errno is set to EIO. we log | |
1576 | * the error and start a new worker process. | |
1577 | */ | |
1578 | if (ret == -1 && saved_errno == EIO) { | |
1579 | DBG("Socket closed unexpectedly... " | |
1580 | "Restarting the worker process"); | |
1581 | ret = run_as_restart_worker(global_worker); | |
fe9f7760 FD |
1582 | if (ret == -1) { |
1583 | ERR("Failed to restart worker process."); | |
1584 | goto err; | |
1585 | } | |
1586 | } | |
2d85a600 | 1587 | } else { |
7567352f | 1588 | DBG("Using run_as without worker"); |
fe9f7760 | 1589 | ret = run_as_noworker(cmd, data, ret_value, uid, gid); |
2d85a600 | 1590 | } |
fe9f7760 | 1591 | err: |
8fec83ea | 1592 | pthread_mutex_unlock(&worker_lock); |
7567352f | 1593 | return ret; |
2d85a600 MD |
1594 | } |
1595 | ||
90e535ef | 1596 | LTTNG_HIDDEN |
e11d277b | 1597 | int run_as_mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 1598 | { |
18710679 JG |
1599 | return run_as_mkdirat_recursive(AT_FDCWD, path, mode, uid, gid); |
1600 | } | |
1601 | ||
1602 | LTTNG_HIDDEN | |
1603 | int run_as_mkdirat_recursive(int dirfd, const char *path, mode_t mode, | |
1604 | uid_t uid, gid_t gid) | |
1605 | { | |
1606 | int ret; | |
93bed9fe JG |
1607 | struct run_as_data data = {}; |
1608 | struct run_as_ret run_as_ret = {}; | |
60b6c79c | 1609 | |
18710679 JG |
1610 | DBG3("mkdirat() recursive fd = %d%s, path = %s, mode = %d, uid = %d, gid = %d", |
1611 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
08797918 | 1612 | path, (int) mode, (int) uid, (int) gid); |
93bed9fe JG |
1613 | ret = lttng_strncpy(data.u.mkdir.path, path, |
1614 | sizeof(data.u.mkdir.path)); | |
18710679 JG |
1615 | if (ret) { |
1616 | ERR("Failed to copy path argument of mkdirat recursive command"); | |
1617 | goto error; | |
1618 | } | |
93bed9fe JG |
1619 | data.u.mkdir.path[sizeof(data.u.mkdir.path) - 1] = '\0'; |
1620 | data.u.mkdir.mode = mode; | |
1621 | data.u.mkdir.dirfd = dirfd; | |
18710679 JG |
1622 | run_as(dirfd == AT_FDCWD ? RUN_AS_MKDIR_RECURSIVE : RUN_AS_MKDIRAT_RECURSIVE, |
1623 | &data, &run_as_ret, uid, gid); | |
1624 | errno = run_as_ret._errno; | |
93bed9fe | 1625 | ret = run_as_ret.u.ret; |
18710679 JG |
1626 | error: |
1627 | return ret; | |
60b6c79c MD |
1628 | } |
1629 | ||
90e535ef | 1630 | LTTNG_HIDDEN |
e11d277b | 1631 | int run_as_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 1632 | { |
18710679 JG |
1633 | return run_as_mkdirat(AT_FDCWD, path, mode, uid, gid); |
1634 | } | |
1635 | ||
1636 | LTTNG_HIDDEN | |
1637 | int run_as_mkdirat(int dirfd, const char *path, mode_t mode, | |
1638 | uid_t uid, gid_t gid) | |
1639 | { | |
1640 | int ret; | |
93bed9fe JG |
1641 | struct run_as_data data = {}; |
1642 | struct run_as_ret run_as_ret = {}; | |
fe9f7760 | 1643 | |
18710679 JG |
1644 | DBG3("mkdirat() recursive fd = %d%s, path = %s, mode = %d, uid = %d, gid = %d", |
1645 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
08797918 | 1646 | path, (int) mode, (int) uid, (int) gid); |
93bed9fe JG |
1647 | ret = lttng_strncpy(data.u.mkdir.path, path, |
1648 | sizeof(data.u.mkdir.path)); | |
18710679 JG |
1649 | if (ret) { |
1650 | ERR("Failed to copy path argument of mkdirat command"); | |
1651 | goto error; | |
1652 | } | |
93bed9fe JG |
1653 | data.u.mkdir.path[sizeof(data.u.mkdir.path) - 1] = '\0'; |
1654 | data.u.mkdir.mode = mode; | |
1655 | data.u.mkdir.dirfd = dirfd; | |
18710679 JG |
1656 | run_as(dirfd == AT_FDCWD ? RUN_AS_MKDIR : RUN_AS_MKDIRAT, |
1657 | &data, &run_as_ret, uid, gid); | |
1658 | errno = run_as_ret._errno; | |
93bed9fe | 1659 | ret = run_as_ret.u.ret; |
18710679 JG |
1660 | error: |
1661 | return ret; | |
60b6c79c MD |
1662 | } |
1663 | ||
90e535ef | 1664 | LTTNG_HIDDEN |
2912cead JG |
1665 | int run_as_open(const char *path, int flags, mode_t mode, uid_t uid, |
1666 | gid_t gid) | |
1667 | { | |
1668 | return run_as_openat(AT_FDCWD, path, flags, mode, uid, gid); | |
1669 | } | |
1670 | ||
1671 | LTTNG_HIDDEN | |
1672 | int run_as_openat(int dirfd, const char *path, int flags, mode_t mode, | |
1673 | uid_t uid, gid_t gid) | |
60b6c79c | 1674 | { |
93bed9fe JG |
1675 | int ret; |
1676 | struct run_as_data data = {}; | |
1677 | struct run_as_ret run_as_ret = {}; | |
fe9f7760 | 1678 | |
2912cead JG |
1679 | DBG3("openat() fd = %d%s, path = %s, flags = %X, mode = %d, uid %d, gid %d", |
1680 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
08797918 | 1681 | path, flags, (int) mode, (int) uid, (int) gid); |
93bed9fe JG |
1682 | ret = lttng_strncpy(data.u.open.path, path, sizeof(data.u.open.path)); |
1683 | if (ret) { | |
1684 | ERR("Failed to copy path argument of open command"); | |
1685 | goto error; | |
1686 | } | |
7567352f MD |
1687 | data.u.open.flags = flags; |
1688 | data.u.open.mode = mode; | |
93bed9fe | 1689 | data.u.open.dirfd = dirfd; |
2912cead | 1690 | run_as(dirfd == AT_FDCWD ? RUN_AS_OPEN : RUN_AS_OPENAT, |
93bed9fe JG |
1691 | &data, &run_as_ret, uid, gid); |
1692 | errno = run_as_ret._errno; | |
1693 | ret = run_as_ret.u.ret < 0 ? run_as_ret.u.ret : | |
1694 | run_as_ret.u.open.fd; | |
1695 | error: | |
1696 | return ret; | |
60b6c79c | 1697 | } |
4628484a MD |
1698 | |
1699 | LTTNG_HIDDEN | |
1700 | int run_as_unlink(const char *path, uid_t uid, gid_t gid) | |
2912cead JG |
1701 | { |
1702 | return run_as_unlinkat(AT_FDCWD, path, uid, gid); | |
1703 | } | |
1704 | ||
1705 | LTTNG_HIDDEN | |
1706 | int run_as_unlinkat(int dirfd, const char *path, uid_t uid, gid_t gid) | |
4628484a | 1707 | { |
93bed9fe JG |
1708 | int ret; |
1709 | struct run_as_data data = {}; | |
1710 | struct run_as_ret run_as_ret = {}; | |
fe9f7760 | 1711 | |
2912cead JG |
1712 | DBG3("unlinkat() fd = %d%s, path = %s, uid = %d, gid = %d", |
1713 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
08797918 | 1714 | path, (int) uid, (int) gid); |
93bed9fe JG |
1715 | ret = lttng_strncpy(data.u.unlink.path, path, |
1716 | sizeof(data.u.unlink.path)); | |
1717 | if (ret) { | |
1718 | goto error; | |
1719 | } | |
1720 | data.u.unlink.dirfd = dirfd; | |
1721 | run_as(dirfd == AT_FDCWD ? RUN_AS_UNLINK : RUN_AS_UNLINKAT, &data, | |
1722 | &run_as_ret, uid, gid); | |
1723 | errno = run_as_ret._errno; | |
1724 | ret = run_as_ret.u.ret; | |
1725 | error: | |
1726 | return ret; | |
1727 | } | |
1728 | ||
1729 | LTTNG_HIDDEN | |
1730 | int run_as_rmdir(const char *path, uid_t uid, gid_t gid) | |
1731 | { | |
1732 | return run_as_rmdirat(AT_FDCWD, path, uid, gid); | |
1733 | } | |
1734 | ||
1735 | LTTNG_HIDDEN | |
1736 | int run_as_rmdirat(int dirfd, const char *path, uid_t uid, gid_t gid) | |
1737 | { | |
1738 | int ret; | |
1739 | struct run_as_data data = {}; | |
1740 | struct run_as_ret run_as_ret = {}; | |
1741 | ||
1742 | DBG3("rmdirat() fd = %d%s, path = %s, uid = %d, gid = %d", | |
1743 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1744 | path, (int) uid, (int) gid); | |
1745 | ret = lttng_strncpy(data.u.rmdir.path, path, | |
1746 | sizeof(data.u.rmdir.path)); | |
1747 | if (ret) { | |
1748 | goto error; | |
1749 | } | |
1750 | data.u.rmdir.dirfd = dirfd; | |
1751 | run_as(dirfd == AT_FDCWD ? RUN_AS_RMDIR : RUN_AS_RMDIRAT, &data, | |
1752 | &run_as_ret, uid, gid); | |
1753 | errno = run_as_ret._errno; | |
1754 | ret = run_as_ret.u.ret; | |
1755 | error: | |
1756 | return ret; | |
4628484a MD |
1757 | } |
1758 | ||
1759 | LTTNG_HIDDEN | |
f75c5439 | 1760 | int run_as_rmdir_recursive(const char *path, uid_t uid, gid_t gid, int flags) |
4628484a | 1761 | { |
f75c5439 | 1762 | return run_as_rmdirat_recursive(AT_FDCWD, path, uid, gid, flags); |
93bed9fe | 1763 | } |
fe9f7760 | 1764 | |
93bed9fe | 1765 | LTTNG_HIDDEN |
f75c5439 | 1766 | int run_as_rmdirat_recursive(int dirfd, const char *path, uid_t uid, gid_t gid, int flags) |
93bed9fe JG |
1767 | { |
1768 | int ret; | |
1769 | struct run_as_data data = {}; | |
1770 | struct run_as_ret run_as_ret = {}; | |
4628484a | 1771 | |
93bed9fe JG |
1772 | DBG3("rmdirat() recursive fd = %d%s, path = %s, uid = %d, gid = %d", |
1773 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
08797918 | 1774 | path, (int) uid, (int) gid); |
93bed9fe JG |
1775 | ret = lttng_strncpy(data.u.rmdir.path, path, |
1776 | sizeof(data.u.rmdir.path)); | |
1777 | if (ret) { | |
1778 | goto error; | |
1779 | } | |
1780 | data.u.rmdir.dirfd = dirfd; | |
f75c5439 | 1781 | data.u.rmdir.flags = flags; |
93bed9fe JG |
1782 | run_as(dirfd == AT_FDCWD ? RUN_AS_RMDIR_RECURSIVE : RUN_AS_RMDIRAT_RECURSIVE, |
1783 | &data, &run_as_ret, uid, gid); | |
1784 | errno = run_as_ret._errno; | |
1785 | ret = run_as_ret.u.ret; | |
1786 | error: | |
1787 | return ret; | |
1788 | } | |
1789 | ||
1790 | LTTNG_HIDDEN | |
1791 | int run_as_rename(const char *old, const char *new, uid_t uid, gid_t gid) | |
1792 | { | |
1793 | return run_as_renameat(AT_FDCWD, old, AT_FDCWD, new, uid, gid); | |
1794 | } | |
1795 | ||
1796 | LTTNG_HIDDEN | |
1797 | int run_as_renameat(int old_dirfd, const char *old_name, | |
1798 | int new_dirfd, const char *new_name, uid_t uid, gid_t gid) | |
1799 | { | |
1800 | int ret; | |
1801 | struct run_as_data data = {}; | |
1802 | struct run_as_ret run_as_ret = {}; | |
1803 | ||
1804 | DBG3("renameat() old_dirfd = %d%s, old_name = %s, new_dirfd = %d%s, new_name = %s, uid = %d, gid = %d", | |
1805 | old_dirfd, old_dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1806 | old_name, | |
1807 | new_dirfd, new_dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1808 | new_name, (int) uid, (int) gid); | |
1809 | ret = lttng_strncpy(data.u.rename.old_path, old_name, | |
1810 | sizeof(data.u.rename.old_path)); | |
1811 | if (ret) { | |
1812 | goto error; | |
1813 | } | |
1814 | ret = lttng_strncpy(data.u.rename.new_path, new_name, | |
1815 | sizeof(data.u.rename.new_path)); | |
1816 | if (ret) { | |
1817 | goto error; | |
1818 | } | |
1819 | ||
1820 | data.u.rename.dirfds[0] = old_dirfd; | |
1821 | data.u.rename.dirfds[1] = new_dirfd; | |
1822 | run_as(old_dirfd == AT_FDCWD && new_dirfd == AT_FDCWD ? | |
1823 | RUN_AS_RENAME : RUN_AS_RENAMEAT, | |
1824 | &data, &run_as_ret, uid, gid); | |
1825 | errno = run_as_ret._errno; | |
1826 | ret = run_as_ret.u.ret; | |
1827 | error: | |
1828 | return ret; | |
7567352f MD |
1829 | } |
1830 | ||
241e0a5a FD |
1831 | LTTNG_HIDDEN |
1832 | int run_as_extract_elf_symbol_offset(int fd, const char* function, | |
1833 | uid_t uid, gid_t gid, uint64_t *offset) | |
1834 | { | |
93bed9fe JG |
1835 | int ret; |
1836 | struct run_as_data data = {}; | |
1837 | struct run_as_ret run_as_ret = {}; | |
f726677b | 1838 | |
241e0a5a | 1839 | DBG3("extract_elf_symbol_offset() on fd=%d and function=%s " |
93bed9fe JG |
1840 | "with for uid %d and gid %d", fd, function, |
1841 | (int) uid, (int) gid); | |
241e0a5a | 1842 | |
93bed9fe | 1843 | data.u.extract_elf_symbol_offset.fd = fd; |
241e0a5a FD |
1844 | |
1845 | strncpy(data.u.extract_elf_symbol_offset.function, function, LTTNG_SYMBOL_NAME_LEN - 1); | |
241e0a5a | 1846 | data.u.extract_elf_symbol_offset.function[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
93bed9fe JG |
1847 | ret = lttng_strncpy(data.u.extract_elf_symbol_offset.function, |
1848 | function, | |
1849 | sizeof(data.u.extract_elf_symbol_offset.function)); | |
1850 | if (ret) { | |
1851 | goto error; | |
1852 | } | |
241e0a5a | 1853 | |
93bed9fe JG |
1854 | run_as(RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET, &data, &run_as_ret, uid, gid); |
1855 | errno = run_as_ret._errno; | |
1856 | if (run_as_ret._error) { | |
1857 | ret = -1; | |
1858 | goto error; | |
241e0a5a FD |
1859 | } |
1860 | ||
93bed9fe JG |
1861 | *offset = run_as_ret.u.extract_elf_symbol_offset.offset; |
1862 | error: | |
1863 | return ret; | |
241e0a5a FD |
1864 | } |
1865 | ||
0ef03255 FD |
1866 | LTTNG_HIDDEN |
1867 | int run_as_extract_sdt_probe_offsets(int fd, const char* provider_name, | |
1868 | const char* probe_name, uid_t uid, gid_t gid, | |
1869 | uint64_t **offsets, uint32_t *num_offset) | |
1870 | { | |
93bed9fe JG |
1871 | int ret; |
1872 | struct run_as_data data = {}; | |
1873 | struct run_as_ret run_as_ret = {}; | |
f726677b | 1874 | |
0ef03255 | 1875 | DBG3("extract_sdt_probe_offsets() on fd=%d, probe_name=%s and " |
93bed9fe JG |
1876 | "provider_name=%s with for uid %d and gid %d", fd, |
1877 | probe_name, provider_name, (int) uid, (int) gid); | |
0ef03255 | 1878 | |
93bed9fe | 1879 | data.u.extract_sdt_probe_offsets.fd = fd; |
0ef03255 | 1880 | |
93bed9fe JG |
1881 | ret = lttng_strncpy(data.u.extract_sdt_probe_offsets.probe_name, probe_name, |
1882 | sizeof(data.u.extract_sdt_probe_offsets.probe_name)); | |
1883 | if (ret) { | |
1884 | goto error; | |
1885 | } | |
1886 | ret = lttng_strncpy(data.u.extract_sdt_probe_offsets.provider_name, | |
1887 | provider_name, | |
1888 | sizeof(data.u.extract_sdt_probe_offsets.provider_name)); | |
1889 | if (ret) { | |
1890 | goto error; | |
0ef03255 FD |
1891 | } |
1892 | ||
93bed9fe JG |
1893 | run_as(RUN_AS_EXTRACT_SDT_PROBE_OFFSETS, &data, &run_as_ret, uid, gid); |
1894 | errno = run_as_ret._errno; | |
1895 | if (run_as_ret._error) { | |
1896 | ret = -1; | |
1897 | goto error; | |
1898 | } | |
0ef03255 | 1899 | |
93bed9fe | 1900 | *num_offset = run_as_ret.u.extract_sdt_probe_offsets.num_offset; |
0ef03255 FD |
1901 | *offsets = zmalloc(*num_offset * sizeof(uint64_t)); |
1902 | if (!*offsets) { | |
93bed9fe JG |
1903 | ret = -ENOMEM; |
1904 | goto error; | |
0ef03255 FD |
1905 | } |
1906 | ||
93bed9fe JG |
1907 | memcpy(*offsets, run_as_ret.u.extract_sdt_probe_offsets.offsets, |
1908 | *num_offset * sizeof(uint64_t)); | |
1909 | error: | |
1910 | return ret; | |
0ef03255 FD |
1911 | } |
1912 | ||
7567352f | 1913 | LTTNG_HIDDEN |
929f71ec JG |
1914 | int run_as_create_worker(const char *procname, |
1915 | post_fork_cleanup_cb clean_up_func, | |
1916 | void *clean_up_user_data) | |
7567352f | 1917 | { |
8fec83ea | 1918 | int ret; |
7567352f | 1919 | |
749b7a0c | 1920 | pthread_mutex_lock(&worker_lock); |
929f71ec JG |
1921 | ret = run_as_create_worker_no_lock(procname, clean_up_func, |
1922 | clean_up_user_data); | |
749b7a0c | 1923 | pthread_mutex_unlock(&worker_lock); |
7567352f MD |
1924 | return ret; |
1925 | } | |
1926 | ||
1927 | LTTNG_HIDDEN | |
1928 | void run_as_destroy_worker(void) | |
1929 | { | |
749b7a0c | 1930 | pthread_mutex_lock(&worker_lock); |
a01c682b | 1931 | run_as_destroy_worker_no_lock(); |
749b7a0c | 1932 | pthread_mutex_unlock(&worker_lock); |
4628484a | 1933 | } |