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fd37ccaf MT |
1 | /*############################################################################# |
2 | # # | |
3 | # Pakfire - The IPFire package management system # | |
4 | # Copyright (C) 2022 Pakfire development team # | |
5 | # # | |
6 | # This program is free software: you can redistribute it and/or modify # | |
7 | # it under the terms of the GNU General Public License as published by # | |
8 | # the Free Software Foundation, either version 3 of the License, or # | |
9 | # (at your option) any later version. # | |
10 | # # | |
11 | # This program is distributed in the hope that it will be useful, # | |
12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
14 | # GNU General Public License for more details. # | |
15 | # # | |
16 | # You should have received a copy of the GNU General Public License # | |
17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
18 | # # | |
19 | #############################################################################*/ | |
20 | ||
32d5f21d | 21 | #include <errno.h> |
bcf09bf5 | 22 | #include <fcntl.h> |
980b15af | 23 | #include <linux/capability.h> |
0bd84dc1 | 24 | #include <linux/sched.h> |
58ee649f | 25 | #include <sys/wait.h> |
4f23b498 | 26 | #include <linux/wait.h> |
0bd84dc1 MT |
27 | #include <sched.h> |
28 | #include <signal.h> | |
32d5f21d | 29 | #include <stdlib.h> |
0bd84dc1 | 30 | #include <syscall.h> |
980b15af | 31 | #include <sys/capability.h> |
616f1fca | 32 | #include <sys/epoll.h> |
43dc0e16 | 33 | #include <sys/eventfd.h> |
7bdf1d8e | 34 | #include <sys/mount.h> |
90d92b5c | 35 | #include <sys/personality.h> |
980b15af | 36 | #include <sys/prctl.h> |
cf440db8 | 37 | #include <sys/resource.h> |
47d2da8e | 38 | #include <sys/signalfd.h> |
335b8a44 | 39 | #include <sys/timerfd.h> |
0bd84dc1 MT |
40 | #include <sys/types.h> |
41 | #include <sys/wait.h> | |
32d5f21d | 42 | |
fec79a33 MT |
43 | // libnl3 |
44 | #include <net/if.h> | |
45 | #include <netlink/route/link.h> | |
46 | ||
739d5b57 MT |
47 | // libseccomp |
48 | #include <seccomp.h> | |
49 | ||
ae5201c5 MT |
50 | // libuuid |
51 | #include <uuid.h> | |
52 | ||
90d92b5c | 53 | #include <pakfire/arch.h> |
e3ddb498 | 54 | #include <pakfire/cgroup.h> |
fd37ccaf | 55 | #include <pakfire/jail.h> |
4f59c39b MT |
56 | #include <pakfire/logging.h> |
57 | #include <pakfire/mount.h> | |
fd37ccaf | 58 | #include <pakfire/pakfire.h> |
729827f7 | 59 | #include <pakfire/path.h> |
6ce56f90 | 60 | #include <pakfire/private.h> |
4896e62c | 61 | #include <pakfire/pwd.h> |
d973a13d | 62 | #include <pakfire/string.h> |
32d5f21d MT |
63 | #include <pakfire/util.h> |
64 | ||
616f1fca MT |
65 | #define BUFFER_SIZE 1024 * 64 |
66 | #define ENVIRON_SIZE 128 | |
67 | #define EPOLL_MAX_EVENTS 2 | |
cc6e2264 | 68 | #define MAX_MOUNTPOINTS 8 |
fd37ccaf | 69 | |
d5bc8fe0 MT |
70 | // The default environment that will be set for every command |
71 | static const struct environ { | |
72 | const char* key; | |
73 | const char* val; | |
74 | } ENV[] = { | |
fbe95cdf | 75 | { "HOME", "/root" }, |
55f54757 | 76 | { "LANG", "C.utf-8" }, |
a7ad6d4f | 77 | { "PATH", "/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin", }, |
d5bc8fe0 | 78 | { "TERM", "vt100" }, |
3bf01105 MT |
79 | |
80 | // Tell everything that it is running inside a Pakfire container | |
81 | { "container", "pakfire" }, | |
d5bc8fe0 MT |
82 | { NULL, NULL }, |
83 | }; | |
84 | ||
cc6e2264 MT |
85 | struct pakfire_jail_mountpoint { |
86 | char source[PATH_MAX]; | |
87 | char target[PATH_MAX]; | |
88 | int flags; | |
89 | }; | |
90 | ||
fd37ccaf | 91 | struct pakfire_jail { |
a13df023 | 92 | struct pakfire_ctx* ctx; |
fd37ccaf MT |
93 | struct pakfire* pakfire; |
94 | int nrefs; | |
32d5f21d | 95 | |
ae5201c5 MT |
96 | // A unique ID for each jail |
97 | uuid_t uuid; | |
98 | char __uuid[UUID_STR_LEN]; | |
99 | ||
cf440db8 MT |
100 | // Resource Limits |
101 | int nice; | |
102 | ||
335b8a44 MT |
103 | // Timeout |
104 | struct itimerspec timeout; | |
105 | ||
15503538 MT |
106 | // CGroup |
107 | struct pakfire_cgroup* cgroup; | |
108 | ||
32d5f21d MT |
109 | // Environment |
110 | char* env[ENVIRON_SIZE]; | |
616f1fca | 111 | |
cc6e2264 MT |
112 | // Mountpoints |
113 | struct pakfire_jail_mountpoint mountpoints[MAX_MOUNTPOINTS]; | |
114 | unsigned int num_mountpoints; | |
2dc104da MT |
115 | |
116 | // Callbacks | |
117 | struct pakfire_jail_callbacks { | |
118 | // Log | |
119 | pakfire_jail_log_callback log; | |
120 | void* log_data; | |
121 | } callbacks; | |
616f1fca MT |
122 | }; |
123 | ||
124 | struct pakfire_log_buffer { | |
125 | char data[BUFFER_SIZE]; | |
126 | size_t used; | |
127 | }; | |
128 | ||
129 | struct pakfire_jail_exec { | |
7bdf1d8e MT |
130 | int flags; |
131 | ||
616f1fca MT |
132 | // PID (of the child) |
133 | pid_t pid; | |
d853213d | 134 | int pidfd; |
616f1fca | 135 | |
d853213d MT |
136 | // Process status (from waitid) |
137 | siginfo_t status; | |
616f1fca | 138 | |
f7d240a7 MT |
139 | // FD to notify the client that the parent has finished initialization |
140 | int completed_fd; | |
141 | ||
616f1fca | 142 | // Log pipes |
e33387d3 | 143 | struct pakfire_jail_pipes { |
2015cb92 | 144 | int stdin[2]; |
616f1fca MT |
145 | int stdout[2]; |
146 | int stderr[2]; | |
e33387d3 MT |
147 | |
148 | // Logging | |
149 | int log_INFO[2]; | |
150 | int log_ERROR[2]; | |
151 | int log_DEBUG[2]; | |
616f1fca MT |
152 | } pipes; |
153 | ||
2015cb92 MT |
154 | // Communicate |
155 | struct pakfire_jail_communicate { | |
156 | pakfire_jail_communicate_in in; | |
157 | pakfire_jail_communicate_out out; | |
158 | void* data; | |
159 | } communicate; | |
160 | ||
616f1fca | 161 | // Log buffers |
e33387d3 | 162 | struct pakfire_jail_buffers { |
616f1fca MT |
163 | struct pakfire_log_buffer stdout; |
164 | struct pakfire_log_buffer stderr; | |
e33387d3 MT |
165 | |
166 | // Logging | |
167 | struct pakfire_log_buffer log_INFO; | |
168 | struct pakfire_log_buffer log_ERROR; | |
169 | struct pakfire_log_buffer log_DEBUG; | |
616f1fca | 170 | } buffers; |
aca565fc MT |
171 | |
172 | struct pakfire_cgroup* cgroup; | |
6b7cf275 | 173 | struct pakfire_cgroup_stats cgroup_stats; |
fd37ccaf MT |
174 | }; |
175 | ||
0bd84dc1 MT |
176 | static int clone3(struct clone_args* args, size_t size) { |
177 | return syscall(__NR_clone3, args, size); | |
178 | } | |
179 | ||
335b8a44 MT |
180 | static int pidfd_send_signal(int pidfd, int sig, siginfo_t* info, unsigned int flags) { |
181 | return syscall(SYS_pidfd_send_signal, pidfd, sig, info, flags); | |
182 | } | |
183 | ||
14df7388 MT |
184 | static int pivot_root(const char* new_root, const char* old_root) { |
185 | return syscall(SYS_pivot_root, new_root, old_root); | |
186 | } | |
187 | ||
7bdf1d8e MT |
188 | static int pakfire_jail_exec_has_flag( |
189 | const struct pakfire_jail_exec* ctx, const enum pakfire_jail_exec_flags flag) { | |
190 | return ctx->flags & flag; | |
191 | } | |
192 | ||
d5bc8fe0 MT |
193 | static void pakfire_jail_free(struct pakfire_jail* jail) { |
194 | DEBUG(jail->pakfire, "Freeing jail at %p\n", jail); | |
195 | ||
196 | // Free environment | |
197 | for (unsigned int i = 0; jail->env[i]; i++) | |
198 | free(jail->env[i]); | |
199 | ||
d34b1e00 MT |
200 | if (jail->cgroup) |
201 | pakfire_cgroup_unref(jail->cgroup); | |
a13df023 MT |
202 | if (jail->pakfire) |
203 | pakfire_unref(jail->pakfire); | |
204 | if (jail->ctx) | |
205 | pakfire_ctx_unref(jail->ctx); | |
d5bc8fe0 MT |
206 | free(jail); |
207 | } | |
208 | ||
e33387d3 MT |
209 | /* |
210 | Passes any log messages on to the default pakfire log callback | |
211 | */ | |
fed41508 MT |
212 | static int pakfire_jail_default_log_callback(struct pakfire* pakfire, void* data, |
213 | int priority, const char* line, size_t length) { | |
214 | switch (priority) { | |
215 | case LOG_INFO: | |
216 | INFO(pakfire, "%s", line); | |
217 | break; | |
218 | ||
219 | case LOG_ERR: | |
220 | ERROR(pakfire, "%s", line); | |
221 | break; | |
e33387d3 MT |
222 | |
223 | #ifdef ENABLE_DEBUG | |
224 | case LOG_DEBUG: | |
225 | DEBUG(pakfire, "%s", line); | |
226 | break; | |
227 | #endif | |
fed41508 MT |
228 | } |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
3bf01105 MT |
233 | static const char* pakfire_jail_uuid(struct pakfire_jail* jail) { |
234 | if (!*jail->__uuid) | |
235 | uuid_unparse_lower(jail->uuid, jail->__uuid); | |
236 | ||
237 | return jail->__uuid; | |
238 | } | |
239 | ||
00ba1d9a MT |
240 | static int pakfire_jail_setup_interactive_env(struct pakfire_jail* jail) { |
241 | // Set PS1 | |
242 | int r = pakfire_jail_set_env(jail, "PS1", "pakfire-jail \\w> "); | |
243 | if (r) | |
244 | return r; | |
245 | ||
246 | // Copy TERM | |
247 | char* TERM = secure_getenv("TERM"); | |
248 | if (TERM) { | |
249 | r = pakfire_jail_set_env(jail, "TERM", TERM); | |
250 | if (r) | |
251 | return r; | |
252 | } | |
253 | ||
254 | // Copy LANG | |
255 | char* LANG = secure_getenv("LANG"); | |
256 | if (LANG) { | |
257 | r = pakfire_jail_set_env(jail, "LANG", LANG); | |
258 | if (r) | |
259 | return r; | |
260 | } | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
9fa1afb6 | 265 | PAKFIRE_EXPORT int pakfire_jail_create(struct pakfire_jail** jail, struct pakfire* pakfire) { |
d5bc8fe0 MT |
266 | int r; |
267 | ||
652f2a99 | 268 | const char* arch = pakfire_get_effective_arch(pakfire); |
aac86bd3 | 269 | |
d5bc8fe0 | 270 | // Allocate a new jail |
fd37ccaf MT |
271 | struct pakfire_jail* j = calloc(1, sizeof(*j)); |
272 | if (!j) | |
273 | return 1; | |
274 | ||
a13df023 MT |
275 | // Reference context |
276 | j->ctx = pakfire_ctx(pakfire); | |
277 | ||
fd37ccaf MT |
278 | // Reference Pakfire |
279 | j->pakfire = pakfire_ref(pakfire); | |
280 | ||
281 | // Initialize reference counter | |
282 | j->nrefs = 1; | |
283 | ||
ae5201c5 MT |
284 | // Generate a random UUID |
285 | uuid_generate_random(j->uuid); | |
286 | ||
84bd7655 MT |
287 | DEBUG(j->pakfire, "Allocated new jail at %p\n", j); |
288 | ||
2dc104da MT |
289 | // Set the default logging callback |
290 | pakfire_jail_set_log_callback(j, pakfire_jail_default_log_callback, NULL); | |
291 | ||
d5bc8fe0 MT |
292 | // Set default environment |
293 | for (const struct environ* e = ENV; e->key; e++) { | |
294 | r = pakfire_jail_set_env(j, e->key, e->val); | |
295 | if (r) | |
296 | goto ERROR; | |
297 | } | |
298 | ||
aac86bd3 | 299 | // Enable all CPU features that CPU has to offer |
1f4e66a4 | 300 | if (!pakfire_arch_is_supported_by_host(arch)) { |
aac86bd3 MT |
301 | r = pakfire_jail_set_env(j, "QEMU_CPU", "max"); |
302 | if (r) | |
303 | goto ERROR; | |
304 | } | |
305 | ||
3bf01105 MT |
306 | // Set container UUID |
307 | r = pakfire_jail_set_env(j, "container_uuid", pakfire_jail_uuid(j)); | |
308 | if (r) | |
309 | goto ERROR; | |
310 | ||
367e708d MT |
311 | // Disable systemctl to talk to systemd |
312 | if (!pakfire_on_root(j->pakfire)) { | |
313 | r = pakfire_jail_set_env(j, "SYSTEMD_OFFLINE", "1"); | |
314 | if (r) | |
315 | goto ERROR; | |
316 | } | |
317 | ||
fd37ccaf MT |
318 | // Done |
319 | *jail = j; | |
320 | return 0; | |
84bd7655 | 321 | |
d5bc8fe0 MT |
322 | ERROR: |
323 | pakfire_jail_free(j); | |
32d5f21d | 324 | |
d5bc8fe0 | 325 | return r; |
fd37ccaf MT |
326 | } |
327 | ||
6ce56f90 | 328 | PAKFIRE_EXPORT struct pakfire_jail* pakfire_jail_ref(struct pakfire_jail* jail) { |
fd37ccaf MT |
329 | ++jail->nrefs; |
330 | ||
331 | return jail; | |
332 | } | |
333 | ||
6ce56f90 | 334 | PAKFIRE_EXPORT struct pakfire_jail* pakfire_jail_unref(struct pakfire_jail* jail) { |
fd37ccaf MT |
335 | if (--jail->nrefs > 0) |
336 | return jail; | |
337 | ||
338 | pakfire_jail_free(jail); | |
339 | return NULL; | |
340 | } | |
32d5f21d | 341 | |
2dc104da MT |
342 | // Logging Callback |
343 | ||
344 | PAKFIRE_EXPORT void pakfire_jail_set_log_callback(struct pakfire_jail* jail, | |
345 | pakfire_jail_log_callback callback, void* data) { | |
346 | jail->callbacks.log = callback; | |
347 | jail->callbacks.log_data = data; | |
348 | } | |
349 | ||
cf440db8 MT |
350 | // Resource Limits |
351 | ||
352 | PAKFIRE_EXPORT int pakfire_jail_nice(struct pakfire_jail* jail, int nice) { | |
353 | // Check if nice level is in range | |
354 | if (nice < -19 || nice > 20) { | |
355 | errno = EINVAL; | |
356 | return 1; | |
357 | } | |
358 | ||
359 | // Store nice level | |
360 | jail->nice = nice; | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
15503538 MT |
365 | int pakfire_jail_set_cgroup(struct pakfire_jail* jail, struct pakfire_cgroup* cgroup) { |
366 | // Free any previous cgroup | |
367 | if (jail->cgroup) { | |
368 | pakfire_cgroup_unref(jail->cgroup); | |
369 | jail->cgroup = NULL; | |
370 | } | |
371 | ||
372 | // Set any new cgroup | |
373 | if (cgroup) { | |
374 | DEBUG(jail->pakfire, "Setting cgroup %p\n", cgroup); | |
375 | ||
376 | jail->cgroup = pakfire_cgroup_ref(cgroup); | |
377 | } | |
378 | ||
379 | // Done | |
380 | return 0; | |
381 | } | |
382 | ||
32d5f21d MT |
383 | // Environment |
384 | ||
385 | // Returns the length of the environment | |
386 | static unsigned int pakfire_jail_env_length(struct pakfire_jail* jail) { | |
387 | unsigned int i = 0; | |
388 | ||
389 | // Count everything in the environment | |
390 | for (char** e = jail->env; *e; e++) | |
391 | i++; | |
392 | ||
393 | return i; | |
394 | } | |
395 | ||
396 | // Finds an existing environment variable and returns its index or -1 if not found | |
397 | static int pakfire_jail_find_env(struct pakfire_jail* jail, const char* key) { | |
398 | if (!key) { | |
399 | errno = EINVAL; | |
400 | return -1; | |
401 | } | |
402 | ||
b88ae806 | 403 | const size_t length = strlen(key); |
32d5f21d MT |
404 | |
405 | for (unsigned int i = 0; jail->env[i]; i++) { | |
b88ae806 MT |
406 | if ((pakfire_string_startswith(jail->env[i], key) |
407 | && *(jail->env[i] + length) == '=')) { | |
32d5f21d | 408 | return i; |
b88ae806 | 409 | } |
32d5f21d MT |
410 | } |
411 | ||
412 | // Nothing found | |
413 | return -1; | |
414 | } | |
415 | ||
416 | // Returns the value of an environment variable or NULL | |
6ce56f90 MT |
417 | PAKFIRE_EXPORT const char* pakfire_jail_get_env(struct pakfire_jail* jail, |
418 | const char* key) { | |
32d5f21d MT |
419 | int i = pakfire_jail_find_env(jail, key); |
420 | if (i < 0) | |
421 | return NULL; | |
422 | ||
423 | return jail->env[i] + strlen(key) + 1; | |
424 | } | |
425 | ||
426 | // Sets an environment variable | |
6ce56f90 MT |
427 | PAKFIRE_EXPORT int pakfire_jail_set_env(struct pakfire_jail* jail, |
428 | const char* key, const char* value) { | |
32d5f21d MT |
429 | // Find the index where to write this value to |
430 | int i = pakfire_jail_find_env(jail, key); | |
431 | if (i < 0) | |
432 | i = pakfire_jail_env_length(jail); | |
433 | ||
434 | // Return -ENOSPC when the environment is full | |
435 | if (i >= ENVIRON_SIZE) { | |
436 | errno = ENOSPC; | |
437 | return -1; | |
438 | } | |
439 | ||
440 | // Free any previous value | |
441 | if (jail->env[i]) | |
442 | free(jail->env[i]); | |
443 | ||
444 | // Format and set environment variable | |
445 | asprintf(&jail->env[i], "%s=%s", key, value); | |
446 | ||
447 | DEBUG(jail->pakfire, "Set environment variable: %s\n", jail->env[i]); | |
448 | ||
449 | return 0; | |
450 | } | |
9f50bf71 | 451 | |
939025e7 | 452 | // Imports an environment |
6ce56f90 | 453 | PAKFIRE_EXPORT int pakfire_jail_import_env(struct pakfire_jail* jail, const char* env[]) { |
939025e7 MT |
454 | if (!env) |
455 | return 0; | |
456 | ||
457 | char* key; | |
458 | char* val; | |
459 | int r; | |
460 | ||
461 | // Copy environment variables | |
462 | for (unsigned int i = 0; env[i]; i++) { | |
463 | r = pakfire_string_partition(env[i], "=", &key, &val); | |
464 | if (r) | |
465 | continue; | |
466 | ||
467 | // Set value | |
468 | r = pakfire_jail_set_env(jail, key, val); | |
469 | ||
470 | if (key) | |
471 | free(key); | |
472 | if (val) | |
473 | free(val); | |
474 | ||
475 | // Break on error | |
476 | if (r) | |
477 | return r; | |
478 | } | |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
335b8a44 MT |
483 | // Timeout |
484 | ||
485 | PAKFIRE_EXPORT int pakfire_jail_set_timeout( | |
486 | struct pakfire_jail* jail, unsigned int timeout) { | |
487 | // Store value | |
488 | jail->timeout.it_value.tv_sec = timeout; | |
489 | ||
490 | if (timeout > 0) | |
a8a41064 | 491 | DEBUG(jail->pakfire, "Timeout set to %u second(s)\n", timeout); |
335b8a44 MT |
492 | else |
493 | DEBUG(jail->pakfire, "Timeout disabled\n"); | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | static int pakfire_jail_create_timer(struct pakfire_jail* jail) { | |
499 | int r; | |
500 | ||
501 | // Nothing to do if no timeout has been set | |
502 | if (!jail->timeout.it_value.tv_sec) | |
503 | return -1; | |
504 | ||
505 | // Create a new timer | |
506 | const int fd = timerfd_create(CLOCK_MONOTONIC, 0); | |
507 | if (fd < 0) { | |
508 | ERROR(jail->pakfire, "Could not create timer: %m\n"); | |
509 | goto ERROR; | |
510 | } | |
511 | ||
512 | // Arm timer | |
513 | r = timerfd_settime(fd, 0, &jail->timeout, NULL); | |
514 | if (r) { | |
515 | ERROR(jail->pakfire, "Could not arm timer: %m\n"); | |
516 | goto ERROR; | |
517 | } | |
518 | ||
519 | return fd; | |
520 | ||
521 | ERROR: | |
dd2d7dbb | 522 | if (fd >= 0) |
335b8a44 MT |
523 | close(fd); |
524 | ||
525 | return -1; | |
526 | } | |
527 | ||
47d2da8e MT |
528 | // Signals |
529 | ||
530 | static int pakfire_jail_handle_signals(struct pakfire_jail* jail) { | |
531 | sigset_t mask; | |
532 | int r; | |
533 | ||
534 | sigemptyset(&mask); | |
535 | sigaddset(&mask, SIGINT); | |
536 | ||
537 | // Block signals | |
538 | r = sigprocmask(SIG_BLOCK, &mask, NULL); | |
539 | if (r < 0) { | |
540 | ERROR(jail->pakfire, "Failed to block signals: %m\n"); | |
541 | return r; | |
542 | } | |
543 | ||
544 | // Create a file descriptor | |
545 | r = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
546 | if (r < 0) { | |
547 | ERROR(jail->pakfire, "Failed to create signalfd: %m\n"); | |
548 | return r; | |
549 | } | |
550 | ||
551 | return r; | |
552 | } | |
553 | ||
e33387d3 MT |
554 | /* |
555 | This function replaces any logging in the child process. | |
556 | ||
557 | All log messages will be sent to the parent process through their respective pipes. | |
558 | */ | |
19e50d86 | 559 | static void pakfire_jail_log_redirect(void* data, int priority, const char* file, |
e33387d3 MT |
560 | int line, const char* fn, const char* format, va_list args) { |
561 | struct pakfire_jail_pipes* pipes = (struct pakfire_jail_pipes*)data; | |
562 | int fd; | |
563 | ||
564 | switch (priority) { | |
565 | case LOG_INFO: | |
566 | fd = pipes->log_INFO[1]; | |
567 | break; | |
568 | ||
569 | case LOG_ERR: | |
570 | fd = pipes->log_ERROR[1]; | |
571 | break; | |
572 | ||
573 | #ifdef ENABLE_DEBUG | |
574 | case LOG_DEBUG: | |
575 | fd = pipes->log_DEBUG[1]; | |
576 | break; | |
577 | #endif /* ENABLE_DEBUG */ | |
578 | ||
579 | // Ignore any messages of an unknown priority | |
580 | default: | |
581 | return; | |
582 | } | |
583 | ||
584 | // Send the log message | |
4c3bab92 | 585 | if (fd >= 0) |
e33387d3 MT |
586 | vdprintf(fd, format, args); |
587 | } | |
588 | ||
616f1fca MT |
589 | static int pakfire_jail_log_buffer_is_full(const struct pakfire_log_buffer* buffer) { |
590 | return (sizeof(buffer->data) == buffer->used); | |
591 | } | |
592 | ||
593 | /* | |
594 | This function reads as much data as it can from the file descriptor. | |
595 | If it finds a whole line in it, it will send it to the logger and repeat the process. | |
596 | If not newline character is found, it will try to read more data until it finds one. | |
597 | */ | |
598 | static int pakfire_jail_handle_log(struct pakfire_jail* jail, | |
e33387d3 | 599 | struct pakfire_jail_exec* ctx, int priority, int fd, |
2015cb92 | 600 | struct pakfire_log_buffer* buffer, pakfire_jail_communicate_out callback, void* data) { |
616f1fca MT |
601 | char line[BUFFER_SIZE + 1]; |
602 | ||
603 | // Fill up buffer from fd | |
604 | if (buffer->used < sizeof(buffer->data)) { | |
605 | ssize_t bytes_read = read(fd, buffer->data + buffer->used, | |
606 | sizeof(buffer->data) - buffer->used); | |
607 | ||
608 | // Handle errors | |
609 | if (bytes_read < 0) { | |
610 | ERROR(jail->pakfire, "Could not read from fd %d: %m\n", fd); | |
611 | return -1; | |
612 | } | |
613 | ||
614 | // Update buffer size | |
615 | buffer->used += bytes_read; | |
616 | } | |
617 | ||
618 | // See if we have any lines that we can write | |
619 | while (buffer->used) { | |
620 | // Search for the end of the first line | |
621 | char* eol = memchr(buffer->data, '\n', buffer->used); | |
622 | ||
623 | // No newline found | |
624 | if (!eol) { | |
625 | // If the buffer is full, we send the content to the logger and try again | |
626 | // This should not happen in practise | |
627 | if (pakfire_jail_log_buffer_is_full(buffer)) { | |
628 | DEBUG(jail->pakfire, "Logging buffer is full. Sending all content\n"); | |
629 | ||
630 | eol = buffer->data + sizeof(buffer->data) - 1; | |
631 | ||
632 | // Otherwise we might have only read parts of the output | |
633 | } else | |
634 | break; | |
635 | } | |
636 | ||
637 | // Find the length of the string | |
638 | size_t length = eol - buffer->data + 1; | |
639 | ||
640 | // Copy the line into the buffer | |
641 | memcpy(line, buffer->data, length); | |
642 | ||
643 | // Terminate the string | |
644 | line[length] = '\0'; | |
645 | ||
646 | // Log the line | |
e33387d3 MT |
647 | if (callback) { |
648 | int r = callback(jail->pakfire, data, priority, line, length); | |
616f1fca MT |
649 | if (r) { |
650 | ERROR(jail->pakfire, "The logging callback returned an error: %d\n", r); | |
651 | return r; | |
652 | } | |
653 | } | |
654 | ||
655 | // Remove line from buffer | |
656 | memmove(buffer->data, buffer->data + length, buffer->used - length); | |
657 | buffer->used -= length; | |
658 | } | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
06b864ae MT |
663 | static int pakfire_jail_stream_stdin(struct pakfire_jail* jail, |
664 | struct pakfire_jail_exec* ctx, const int fd) { | |
665 | int r; | |
666 | ||
667 | // Nothing to do if there is no stdin callback set | |
668 | if (!ctx->communicate.in) { | |
669 | DEBUG(jail->pakfire, "Callback for standard input is not set\n"); | |
670 | return 0; | |
671 | } | |
672 | ||
f5a70a96 MT |
673 | // Skip if the writing pipe has already been closed |
674 | if (!ctx->pipes.stdin[1]) | |
675 | return 0; | |
676 | ||
06b864ae MT |
677 | DEBUG(jail->pakfire, "Streaming standard input...\n"); |
678 | ||
679 | // Calling the callback | |
680 | r = ctx->communicate.in(jail->pakfire, ctx->communicate.data, fd); | |
681 | ||
682 | DEBUG(jail->pakfire, "Standard input callback finished: %d\n", r); | |
683 | ||
684 | // The callback signaled that it has written everything | |
685 | if (r == EOF) { | |
686 | DEBUG(jail->pakfire, "Closing standard input pipe\n"); | |
687 | ||
f5a70a96 | 688 | // Close the file-descriptor |
06b864ae | 689 | close(fd); |
f5a70a96 MT |
690 | |
691 | // Reset the file-descriptor so it won't be closed again later | |
dd2d7dbb | 692 | ctx->pipes.stdin[1] = -1; |
f5a70a96 MT |
693 | |
694 | // Report success | |
06b864ae MT |
695 | r = 0; |
696 | } | |
697 | ||
698 | return r; | |
699 | } | |
700 | ||
195fe455 MT |
701 | static int pakfire_jail_setup_pipe(struct pakfire_jail* jail, int (*fds)[2], const int flags) { |
702 | int r = pipe2(*fds, flags); | |
703 | if (r < 0) { | |
704 | ERROR(jail->pakfire, "Could not setup pipe: %m\n"); | |
705 | return 1; | |
706 | } | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | static void pakfire_jail_close_pipe(struct pakfire_jail* jail, int fds[2]) { | |
712 | for (unsigned int i = 0; i < 2; i++) | |
dd2d7dbb | 713 | if (fds[i] >= 0) |
195fe455 MT |
714 | close(fds[i]); |
715 | } | |
716 | ||
e33387d3 MT |
717 | /* |
718 | This is a convenience function to fetch the reading end of a pipe and | |
719 | closes the write end. | |
720 | */ | |
06b864ae | 721 | static int pakfire_jail_get_pipe_to_read(struct pakfire_jail* jail, int (*fds)[2]) { |
e33387d3 MT |
722 | // Give the variables easier names to avoid confusion |
723 | int* fd_read = &(*fds)[0]; | |
724 | int* fd_write = &(*fds)[1]; | |
725 | ||
726 | // Close the write end of the pipe | |
4c3bab92 | 727 | if (*fd_write >= 0) { |
e33387d3 | 728 | close(*fd_write); |
d2eaf8dc | 729 | *fd_write = -1; |
e33387d3 MT |
730 | } |
731 | ||
732 | // Return the read end | |
4c3bab92 MT |
733 | if (*fd_read >= 0) |
734 | return *fd_read; | |
735 | ||
736 | return -1; | |
e33387d3 MT |
737 | } |
738 | ||
06b864ae MT |
739 | static int pakfire_jail_get_pipe_to_write(struct pakfire_jail* jail, int (*fds)[2]) { |
740 | // Give the variables easier names to avoid confusion | |
741 | int* fd_read = &(*fds)[0]; | |
742 | int* fd_write = &(*fds)[1]; | |
743 | ||
744 | // Close the read end of the pipe | |
4c3bab92 | 745 | if (*fd_read >= 0) { |
06b864ae | 746 | close(*fd_read); |
d2eaf8dc | 747 | *fd_read = -1; |
06b864ae MT |
748 | } |
749 | ||
750 | // Return the write end | |
4c3bab92 MT |
751 | if (*fd_write >= 0) |
752 | return *fd_write; | |
753 | ||
754 | return -1; | |
06b864ae MT |
755 | } |
756 | ||
19e50d86 MT |
757 | static int pakfire_jail_log(struct pakfire* pakfire, void* data, int priority, |
758 | const char* line, const size_t length) { | |
759 | // Pass everything to the parent logger | |
760 | pakfire_log_condition(pakfire, priority, 0, "%.*s", (int)length, line); | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
d853213d | 765 | static int pakfire_jail_wait(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx) { |
616f1fca MT |
766 | int epollfd = -1; |
767 | struct epoll_event ev; | |
768 | struct epoll_event events[EPOLL_MAX_EVENTS]; | |
47d2da8e | 769 | struct signalfd_siginfo siginfo; |
335b8a44 | 770 | char garbage[8]; |
616f1fca MT |
771 | int r = 0; |
772 | ||
773 | // Fetch file descriptors from context | |
06b864ae MT |
774 | const int stdin = pakfire_jail_get_pipe_to_write(jail, &ctx->pipes.stdin); |
775 | const int stdout = pakfire_jail_get_pipe_to_read(jail, &ctx->pipes.stdout); | |
776 | const int stderr = pakfire_jail_get_pipe_to_read(jail, &ctx->pipes.stderr); | |
d853213d | 777 | const int pidfd = ctx->pidfd; |
616f1fca | 778 | |
335b8a44 MT |
779 | // Timer |
780 | const int timerfd = pakfire_jail_create_timer(jail); | |
781 | ||
e33387d3 | 782 | // Logging |
06b864ae MT |
783 | const int log_INFO = pakfire_jail_get_pipe_to_read(jail, &ctx->pipes.log_INFO); |
784 | const int log_ERROR = pakfire_jail_get_pipe_to_read(jail, &ctx->pipes.log_ERROR); | |
785 | const int log_DEBUG = pakfire_jail_get_pipe_to_read(jail, &ctx->pipes.log_DEBUG); | |
7ebfb7cb | 786 | |
47d2da8e MT |
787 | // Signals |
788 | const int signalfd = pakfire_jail_handle_signals(jail); | |
789 | ||
7ebfb7cb | 790 | // Make a list of all file descriptors we are interested in |
47d2da8e MT |
791 | const int fds[] = { |
792 | stdin, stdout, stderr, pidfd, timerfd, signalfd, log_INFO, log_ERROR, log_DEBUG, | |
616f1fca MT |
793 | }; |
794 | ||
795 | // Setup epoll | |
796 | epollfd = epoll_create1(0); | |
797 | if (epollfd < 0) { | |
798 | ERROR(jail->pakfire, "Could not initialize epoll(): %m\n"); | |
799 | r = 1; | |
d853213d | 800 | goto ERROR; |
616f1fca MT |
801 | } |
802 | ||
616f1fca | 803 | // Turn file descriptors into non-blocking mode and add them to epoll() |
3aad8c0d | 804 | for (unsigned int i = 0; i < sizeof(fds) / sizeof(*fds); i++) { |
616f1fca MT |
805 | int fd = fds[i]; |
806 | ||
d853213d | 807 | // Skip fds which were not initialized |
d2eaf8dc | 808 | if (fd < 0) |
d853213d MT |
809 | continue; |
810 | ||
e48beb24 MT |
811 | ev.events = EPOLLHUP; |
812 | ||
813 | if (fd == stdin) | |
814 | ev.events |= EPOLLOUT; | |
815 | else | |
816 | ev.events |= EPOLLIN; | |
817 | ||
06b864ae MT |
818 | // Read flags |
819 | int flags = fcntl(fd, F_GETFL, 0); | |
820 | ||
821 | // Set modified flags | |
822 | if (fcntl(fd, F_SETFL, flags|O_NONBLOCK) < 0) { | |
823 | ERROR(jail->pakfire, | |
824 | "Could not set file descriptor %d into non-blocking mode: %m\n", fd); | |
825 | r = 1; | |
826 | goto ERROR; | |
827 | } | |
828 | ||
616f1fca MT |
829 | ev.data.fd = fd; |
830 | ||
831 | if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev) < 0) { | |
832 | ERROR(jail->pakfire, "Could not add file descriptor %d to epoll(): %m\n", fd); | |
833 | r = 1; | |
d853213d | 834 | goto ERROR; |
616f1fca MT |
835 | } |
836 | } | |
837 | ||
838 | int ended = 0; | |
839 | ||
840 | // Loop for as long as the process is alive | |
841 | while (!ended) { | |
616f1fca MT |
842 | int num = epoll_wait(epollfd, events, EPOLL_MAX_EVENTS, -1); |
843 | if (num < 1) { | |
844 | // Ignore if epoll_wait() has been interrupted | |
845 | if (errno == EINTR) | |
846 | continue; | |
847 | ||
848 | ERROR(jail->pakfire, "epoll_wait() failed: %m\n"); | |
849 | r = 1; | |
850 | ||
d853213d | 851 | goto ERROR; |
616f1fca MT |
852 | } |
853 | ||
616f1fca | 854 | for (int i = 0; i < num; i++) { |
e068b964 | 855 | int e = events[i].events; |
616f1fca MT |
856 | int fd = events[i].data.fd; |
857 | ||
e33387d3 | 858 | struct pakfire_log_buffer* buffer = NULL; |
2015cb92 | 859 | pakfire_jail_communicate_out callback = NULL; |
e33387d3 MT |
860 | void* data = NULL; |
861 | int priority; | |
862 | ||
e068b964 MT |
863 | // Check if there is any data to be read |
864 | if (e & EPOLLIN) { | |
865 | // Handle any changes to the PIDFD | |
866 | if (fd == pidfd) { | |
867 | // Call waidid() and store the result | |
868 | r = waitid(P_PIDFD, ctx->pidfd, &ctx->status, WEXITED); | |
869 | if (r) { | |
870 | ERROR(jail->pakfire, "waitid() failed: %m\n"); | |
871 | goto ERROR; | |
872 | } | |
d853213d | 873 | |
e068b964 MT |
874 | // Mark that we have ended so that we will process the remaining |
875 | // events from epoll() now, but won't restart the outer loop. | |
876 | ended = 1; | |
877 | continue; | |
d853213d | 878 | |
335b8a44 MT |
879 | // Handle timer events |
880 | } else if (fd == timerfd) { | |
881 | DEBUG(jail->pakfire, "Timer event received\n"); | |
882 | ||
883 | // Disarm the timer | |
884 | r = read(timerfd, garbage, sizeof(garbage)); | |
885 | if (r < 1) { | |
886 | ERROR(jail->pakfire, "Could not disarm timer: %m\n"); | |
887 | r = 1; | |
888 | goto ERROR; | |
889 | } | |
890 | ||
891 | // Terminate the process if it hasn't already ended | |
892 | if (!ended) { | |
893 | DEBUG(jail->pakfire, "Terminating process...\n"); | |
894 | ||
895 | // Send SIGTERM to the process | |
896 | r = pidfd_send_signal(pidfd, SIGKILL, NULL, 0); | |
897 | if (r) { | |
898 | ERROR(jail->pakfire, "Could not kill process: %m\n"); | |
899 | goto ERROR; | |
900 | } | |
901 | } | |
902 | ||
903 | // There is nothing else to do | |
904 | continue; | |
905 | ||
47d2da8e MT |
906 | // Handle signals |
907 | } else if (fd == signalfd) { | |
908 | // Read the signal | |
909 | r = read(signalfd, &siginfo, sizeof(siginfo)); | |
910 | if (r < 1) { | |
911 | ERROR(jail->pakfire, "Could not read signal: %m\n"); | |
912 | goto ERROR; | |
913 | } | |
914 | ||
a8a41064 | 915 | DEBUG(jail->pakfire, "Received signal %u\n", siginfo.ssi_signo); |
47d2da8e MT |
916 | |
917 | // Handle signals | |
918 | switch (siginfo.ssi_signo) { | |
919 | // Pass SIGINT down to the child process | |
920 | case SIGINT: | |
921 | r = pidfd_send_signal(pidfd, siginfo.ssi_signo, NULL, 0); | |
922 | if (r) { | |
923 | ERROR(jail->pakfire, "Could not send signal to process: %m\n"); | |
924 | goto ERROR; | |
925 | } | |
926 | break; | |
927 | ||
928 | default: | |
a8a41064 | 929 | ERROR(jail->pakfire, "Received unhandled signal %u\n", |
47d2da8e MT |
930 | siginfo.ssi_signo); |
931 | break; | |
932 | } | |
933 | ||
934 | // Don't fall through to log processing | |
935 | continue; | |
936 | ||
e068b964 MT |
937 | // Handle logging messages |
938 | } else if (fd == log_INFO) { | |
939 | buffer = &ctx->buffers.log_INFO; | |
940 | priority = LOG_INFO; | |
e33387d3 | 941 | |
19e50d86 | 942 | callback = pakfire_jail_log; |
e33387d3 | 943 | |
e068b964 MT |
944 | } else if (fd == log_ERROR) { |
945 | buffer = &ctx->buffers.log_ERROR; | |
946 | priority = LOG_ERR; | |
e33387d3 | 947 | |
19e50d86 | 948 | callback = pakfire_jail_log; |
e33387d3 | 949 | |
e068b964 MT |
950 | } else if (fd == log_DEBUG) { |
951 | buffer = &ctx->buffers.log_DEBUG; | |
952 | priority = LOG_DEBUG; | |
e33387d3 | 953 | |
19e50d86 | 954 | callback = pakfire_jail_log; |
e33387d3 | 955 | |
e068b964 MT |
956 | // Handle anything from the log pipes |
957 | } else if (fd == stdout) { | |
958 | buffer = &ctx->buffers.stdout; | |
959 | priority = LOG_INFO; | |
616f1fca | 960 | |
2dc104da MT |
961 | // Send any output to the default logger if no callback is set |
962 | if (ctx->communicate.out) { | |
963 | callback = ctx->communicate.out; | |
964 | data = ctx->communicate.data; | |
965 | } else { | |
966 | callback = jail->callbacks.log; | |
967 | data = jail->callbacks.log_data; | |
968 | } | |
e33387d3 | 969 | |
e068b964 MT |
970 | } else if (fd == stderr) { |
971 | buffer = &ctx->buffers.stderr; | |
972 | priority = LOG_ERR; | |
616f1fca | 973 | |
2dc104da MT |
974 | // Send any output to the default logger if no callback is set |
975 | if (ctx->communicate.out) { | |
976 | callback = ctx->communicate.out; | |
977 | data = ctx->communicate.data; | |
978 | } else { | |
979 | callback = jail->callbacks.log; | |
980 | data = jail->callbacks.log_data; | |
981 | } | |
e33387d3 | 982 | |
e068b964 MT |
983 | } else { |
984 | DEBUG(jail->pakfire, "Received invalid file descriptor %d\n", fd); | |
985 | continue; | |
986 | } | |
987 | ||
988 | // Handle log event | |
989 | r = pakfire_jail_handle_log(jail, ctx, priority, fd, buffer, callback, data); | |
990 | if (r) | |
991 | goto ERROR; | |
616f1fca MT |
992 | } |
993 | ||
06b864ae MT |
994 | if (e & EPOLLOUT) { |
995 | // Handle standard input | |
996 | if (fd == stdin) { | |
997 | r = pakfire_jail_stream_stdin(jail, ctx, fd); | |
998 | if (r) { | |
999 | switch (errno) { | |
1000 | // Ignore if we filled up the buffer | |
1001 | case EAGAIN: | |
1002 | break; | |
1003 | ||
1004 | default: | |
1005 | ERROR(jail->pakfire, "Could not write to stdin: %m\n"); | |
1006 | goto ERROR; | |
1007 | } | |
1008 | } | |
1009 | } | |
1010 | } | |
1011 | ||
e068b964 MT |
1012 | // Check if any file descriptors have been closed |
1013 | if (e & EPOLLHUP) { | |
1014 | // Remove the file descriptor | |
1015 | r = epoll_ctl(epollfd, EPOLL_CTL_DEL, fd, NULL); | |
1016 | if (r) { | |
1017 | ERROR(jail->pakfire, "Could not remove closed file-descriptor %d: %m\n", fd); | |
1018 | goto ERROR; | |
1019 | } | |
1020 | } | |
616f1fca MT |
1021 | } |
1022 | } | |
1023 | ||
d853213d | 1024 | ERROR: |
dd2d7dbb | 1025 | if (epollfd >= 0) |
616f1fca | 1026 | close(epollfd); |
dd2d7dbb | 1027 | if (timerfd >= 0) |
335b8a44 | 1028 | close(timerfd); |
dd2d7dbb | 1029 | if (signalfd >= 0) |
47d2da8e | 1030 | close(signalfd); |
616f1fca MT |
1031 | |
1032 | return r; | |
1033 | } | |
1034 | ||
ccdd2e95 MT |
1035 | int pakfire_jail_capture_stdout(struct pakfire* pakfire, void* data, |
1036 | int priority, const char* line, size_t length) { | |
12b9b39f MT |
1037 | char** output = (char**)data; |
1038 | int r; | |
0de6bb30 | 1039 | |
2015cb92 MT |
1040 | // Append everything from stdout to a buffer |
1041 | if (output && priority == LOG_INFO) { | |
12b9b39f MT |
1042 | r = asprintf(output, "%s%s", (output && *output) ? *output : "", line); |
1043 | if (r < 0) | |
0de6bb30 | 1044 | return 1; |
0de6bb30 MT |
1045 | return 0; |
1046 | } | |
1047 | ||
1048 | // Send everything else to the default logger | |
1049 | return pakfire_jail_default_log_callback(pakfire, NULL, priority, line, length); | |
1050 | } | |
1051 | ||
980b15af MT |
1052 | // Capabilities |
1053 | ||
e6791c52 MT |
1054 | // Logs all capabilities of the current process |
1055 | static int pakfire_jail_show_capabilities(struct pakfire_jail* jail) { | |
1056 | cap_t caps = NULL; | |
1057 | char* name = NULL; | |
1058 | cap_flag_value_t value_e; | |
1059 | cap_flag_value_t value_i; | |
1060 | cap_flag_value_t value_p; | |
1061 | int r; | |
980b15af | 1062 | |
e6791c52 MT |
1063 | // Fetch PID |
1064 | pid_t pid = getpid(); | |
980b15af | 1065 | |
e6791c52 MT |
1066 | // Fetch all capabilities |
1067 | caps = cap_get_proc(); | |
1068 | if (!caps) { | |
1069 | ERROR(jail->pakfire, "Could not fetch capabilities: %m\n"); | |
1070 | r = 1; | |
1071 | goto ERROR; | |
1072 | } | |
980b15af | 1073 | |
e6791c52 | 1074 | DEBUG(jail->pakfire, "Capabilities of PID %d:\n", pid); |
980b15af | 1075 | |
e6791c52 MT |
1076 | // Iterate over all capabilities |
1077 | for (unsigned int cap = 0; cap_valid(cap); cap++) { | |
1078 | name = cap_to_name(cap); | |
980b15af | 1079 | |
e6791c52 MT |
1080 | // Fetch effective value |
1081 | r = cap_get_flag(caps, cap, CAP_EFFECTIVE, &value_e); | |
1082 | if (r) | |
1083 | goto ERROR; | |
980b15af | 1084 | |
e6791c52 MT |
1085 | // Fetch inheritable value |
1086 | r = cap_get_flag(caps, cap, CAP_INHERITABLE, &value_i); | |
1087 | if (r) | |
1088 | goto ERROR; | |
980b15af | 1089 | |
e6791c52 MT |
1090 | // Fetch permitted value |
1091 | r = cap_get_flag(caps, cap, CAP_PERMITTED, &value_p); | |
1092 | if (r) | |
1093 | goto ERROR; | |
980b15af | 1094 | |
e6791c52 MT |
1095 | DEBUG(jail->pakfire, |
1096 | " %-24s : %c%c%c\n", | |
1097 | name, | |
1098 | (value_e == CAP_SET) ? 'e' : '-', | |
1099 | (value_i == CAP_SET) ? 'i' : '-', | |
1100 | (value_p == CAP_SET) ? 'p' : '-' | |
1101 | ); | |
980b15af | 1102 | |
e6791c52 MT |
1103 | // Free name |
1104 | cap_free(name); | |
1105 | name = NULL; | |
1106 | } | |
980b15af | 1107 | |
e6791c52 MT |
1108 | // Success |
1109 | r = 0; | |
980b15af | 1110 | |
e6791c52 MT |
1111 | ERROR: |
1112 | if (name) | |
1113 | cap_free(name); | |
1114 | if (caps) | |
1115 | cap_free(caps); | |
980b15af | 1116 | |
e6791c52 MT |
1117 | return r; |
1118 | } | |
980b15af | 1119 | |
e6791c52 MT |
1120 | static int pakfire_jail_set_capabilities(struct pakfire_jail* jail) { |
1121 | cap_t caps = NULL; | |
1122 | char* name = NULL; | |
1123 | int r; | |
980b15af | 1124 | |
e6791c52 MT |
1125 | // Fetch capabilities |
1126 | caps = cap_get_proc(); | |
1127 | if (!caps) { | |
1128 | ERROR(jail->pakfire, "Could not read capabilities: %m\n"); | |
1129 | r = 1; | |
1130 | goto ERROR; | |
1131 | } | |
980b15af | 1132 | |
e6791c52 MT |
1133 | // Walk through all capabilities |
1134 | for (cap_value_t cap = 0; cap_valid(cap); cap++) { | |
1135 | cap_value_t _caps[] = { cap }; | |
980b15af | 1136 | |
e6791c52 MT |
1137 | // Fetch the name of the capability |
1138 | name = cap_to_name(cap); | |
980b15af | 1139 | |
e6791c52 MT |
1140 | r = cap_set_flag(caps, CAP_EFFECTIVE, 1, _caps, CAP_SET); |
1141 | if (r) { | |
1142 | ERROR(jail->pakfire, "Could not set %s: %m\n", name); | |
1143 | goto ERROR; | |
1144 | } | |
980b15af | 1145 | |
e6791c52 | 1146 | r = cap_set_flag(caps, CAP_INHERITABLE, 1, _caps, CAP_SET); |
980b15af | 1147 | if (r) { |
e6791c52 MT |
1148 | ERROR(jail->pakfire, "Could not set %s: %m\n", name); |
1149 | goto ERROR; | |
980b15af MT |
1150 | } |
1151 | ||
e6791c52 MT |
1152 | r = cap_set_flag(caps, CAP_PERMITTED, 1, _caps, CAP_SET); |
1153 | if (r) { | |
1154 | ERROR(jail->pakfire, "Could not set %s: %m\n", name); | |
1155 | goto ERROR; | |
1156 | } | |
980b15af | 1157 | |
e6791c52 MT |
1158 | // Free name |
1159 | cap_free(name); | |
1160 | name = NULL; | |
980b15af MT |
1161 | } |
1162 | ||
e6791c52 MT |
1163 | // Restore all capabilities |
1164 | r = cap_set_proc(caps); | |
980b15af | 1165 | if (r) { |
e6791c52 | 1166 | ERROR(jail->pakfire, "Restoring capabilities failed: %m\n"); |
980b15af MT |
1167 | goto ERROR; |
1168 | } | |
1169 | ||
e6791c52 MT |
1170 | // Add all capabilities to the ambient set |
1171 | for (unsigned int cap = 0; cap_valid(cap); cap++) { | |
1172 | name = cap_to_name(cap); | |
1173 | ||
1174 | // Raise the capability | |
1175 | r = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, cap, 0, 0); | |
1176 | if (r) { | |
1177 | ERROR(jail->pakfire, "Could not set ambient capability %s: %m\n", name); | |
1178 | goto ERROR; | |
1179 | } | |
1180 | ||
1181 | // Free name | |
1182 | cap_free(name); | |
1183 | name = NULL; | |
980b15af MT |
1184 | } |
1185 | ||
e6791c52 MT |
1186 | // Success |
1187 | r = 0; | |
1188 | ||
980b15af | 1189 | ERROR: |
e6791c52 MT |
1190 | if (name) |
1191 | cap_free(name); | |
980b15af MT |
1192 | if (caps) |
1193 | cap_free(caps); | |
1194 | ||
1195 | return r; | |
1196 | } | |
1197 | ||
739d5b57 MT |
1198 | // Syscall Filter |
1199 | ||
1200 | static int pakfire_jail_limit_syscalls(struct pakfire_jail* jail) { | |
1201 | const int syscalls[] = { | |
1202 | // The kernel's keyring isn't namespaced | |
1203 | SCMP_SYS(keyctl), | |
1204 | SCMP_SYS(add_key), | |
1205 | SCMP_SYS(request_key), | |
1206 | ||
1207 | // Disable userfaultfd | |
1208 | SCMP_SYS(userfaultfd), | |
1209 | ||
1210 | // Disable perf which could leak a lot of information about the host | |
1211 | SCMP_SYS(perf_event_open), | |
1212 | ||
1213 | 0, | |
1214 | }; | |
1215 | int r = 1; | |
1216 | ||
1217 | DEBUG(jail->pakfire, "Applying syscall filter...\n"); | |
1218 | ||
1219 | // Setup a syscall filter which allows everything by default | |
1220 | scmp_filter_ctx ctx = seccomp_init(SCMP_ACT_ALLOW); | |
1221 | if (!ctx) { | |
1222 | ERROR(jail->pakfire, "Could not setup seccomp filter: %m\n"); | |
1223 | goto ERROR; | |
1224 | } | |
1225 | ||
1226 | // All all syscalls | |
1227 | for (const int* syscall = syscalls; *syscall; syscall++) { | |
1228 | r = seccomp_rule_add(ctx, SCMP_ACT_ERRNO(EPERM), *syscall, 0); | |
1229 | if (r) { | |
1230 | ERROR(jail->pakfire, "Could not configure syscall %d: %m\n", *syscall); | |
1231 | goto ERROR; | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | // Load syscall filter into the kernel | |
1236 | r = seccomp_load(ctx); | |
1237 | if (r) { | |
1238 | ERROR(jail->pakfire, "Could not load syscall filter into the kernel: %m\n"); | |
1239 | goto ERROR; | |
1240 | } | |
1241 | ||
1242 | ERROR: | |
1243 | if (ctx) | |
1244 | seccomp_release(ctx); | |
1245 | ||
1246 | return r; | |
1247 | } | |
1248 | ||
cc6e2264 MT |
1249 | // Mountpoints |
1250 | ||
061223f7 | 1251 | PAKFIRE_EXPORT int pakfire_jail_bind(struct pakfire_jail* jail, |
cc6e2264 MT |
1252 | const char* source, const char* target, int flags) { |
1253 | struct pakfire_jail_mountpoint* mp = NULL; | |
1254 | int r; | |
1255 | ||
1256 | // Check if there is any space left | |
1257 | if (jail->num_mountpoints >= MAX_MOUNTPOINTS) { | |
1258 | errno = ENOSPC; | |
1259 | return 1; | |
1260 | } | |
1261 | ||
1262 | // Check for valid inputs | |
1263 | if (!source || !target) { | |
1264 | errno = EINVAL; | |
1265 | return 1; | |
1266 | } | |
1267 | ||
1268 | // Select the next free slot | |
1269 | mp = &jail->mountpoints[jail->num_mountpoints]; | |
1270 | ||
1271 | // Copy source | |
1272 | r = pakfire_string_set(mp->source, source); | |
a60955af | 1273 | if (r) { |
cc6e2264 | 1274 | ERROR(jail->pakfire, "Could not copy source: %m\n"); |
a60955af | 1275 | return r; |
cc6e2264 MT |
1276 | } |
1277 | ||
1278 | // Copy target | |
1279 | r = pakfire_string_set(mp->target, target); | |
a60955af | 1280 | if (r) { |
cc6e2264 | 1281 | ERROR(jail->pakfire, "Could not copy target: %m\n"); |
a60955af | 1282 | return r; |
cc6e2264 MT |
1283 | } |
1284 | ||
1285 | // Copy flags | |
1286 | mp->flags = flags; | |
1287 | ||
1288 | // Increment counter | |
1289 | jail->num_mountpoints++; | |
1290 | ||
1291 | return 0; | |
1292 | } | |
1293 | ||
7bdf1d8e MT |
1294 | static int pakfire_jail_mount_networking(struct pakfire_jail* jail) { |
1295 | int r; | |
1296 | ||
1297 | const char* paths[] = { | |
1298 | "/etc/hosts", | |
1299 | "/etc/resolv.conf", | |
1300 | NULL, | |
1301 | }; | |
1302 | ||
1303 | // Bind-mount all paths read-only | |
1304 | for (const char** path = paths; *path; path++) { | |
1305 | r = pakfire_bind(jail->pakfire, *path, NULL, MS_RDONLY); | |
693a979a MT |
1306 | if (r) { |
1307 | switch (errno) { | |
1308 | // Ignore if we don't have permission | |
1309 | case EPERM: | |
1310 | continue; | |
1311 | ||
1312 | default: | |
1313 | break; | |
1314 | } | |
7bdf1d8e | 1315 | return r; |
693a979a | 1316 | } |
7bdf1d8e MT |
1317 | } |
1318 | ||
1319 | return 0; | |
1320 | } | |
1321 | ||
cc6e2264 MT |
1322 | /* |
1323 | Mounts everything that we require in the new namespace | |
1324 | */ | |
7bdf1d8e | 1325 | static int pakfire_jail_mount(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx) { |
cc6e2264 | 1326 | struct pakfire_jail_mountpoint* mp = NULL; |
282b732a | 1327 | int flags = 0; |
cc6e2264 MT |
1328 | int r; |
1329 | ||
282b732a MT |
1330 | // Enable loop devices |
1331 | if (pakfire_jail_exec_has_flag(ctx, PAKFIRE_JAIL_HAS_LOOP_DEVICES)) | |
1332 | flags |= PAKFIRE_MOUNT_LOOP_DEVICES; | |
1333 | ||
cc6e2264 | 1334 | // Mount all default stuff |
282b732a | 1335 | r = pakfire_mount_all(jail->pakfire, flags); |
cc6e2264 MT |
1336 | if (r) |
1337 | return r; | |
1338 | ||
7bdf1d8e MT |
1339 | // Mount networking stuff |
1340 | if (pakfire_jail_exec_has_flag(ctx, PAKFIRE_JAIL_HAS_NETWORKING)) { | |
1341 | r = pakfire_jail_mount_networking(jail); | |
1342 | if (r) | |
1343 | return r; | |
1344 | } | |
1345 | ||
cc6e2264 MT |
1346 | // Mount all custom stuff |
1347 | for (unsigned int i = 0; i < jail->num_mountpoints; i++) { | |
1348 | // Fetch mountpoint | |
1349 | mp = &jail->mountpoints[i]; | |
1350 | ||
1351 | // Mount it | |
1352 | r = pakfire_bind(jail->pakfire, mp->source, mp->target, mp->flags); | |
1353 | if (r) | |
1354 | return r; | |
1355 | } | |
1356 | ||
1357 | // Log all mountpoints | |
1358 | pakfire_mount_list(jail->pakfire); | |
1359 | ||
1360 | return 0; | |
1361 | } | |
1362 | ||
fec79a33 MT |
1363 | // Networking |
1364 | ||
1365 | static int pakfire_jail_setup_loopback(struct pakfire_jail* jail) { | |
1366 | struct nl_sock* nl = NULL; | |
1367 | struct nl_cache* cache = NULL; | |
1368 | struct rtnl_link* link = NULL; | |
1369 | struct rtnl_link* change = NULL; | |
1370 | int r; | |
1371 | ||
1372 | DEBUG(jail->pakfire, "Setting up loopback...\n"); | |
1373 | ||
1374 | // Allocate a netlink socket | |
1375 | nl = nl_socket_alloc(); | |
1376 | if (!nl) { | |
1377 | ERROR(jail->pakfire, "Could not allocate a netlink socket: %m\n"); | |
1378 | r = 1; | |
1379 | goto ERROR; | |
1380 | } | |
1381 | ||
1382 | // Connect the socket | |
1383 | r = nl_connect(nl, NETLINK_ROUTE); | |
1384 | if (r) { | |
1385 | ERROR(jail->pakfire, "Could not connect netlink socket: %s\n", nl_geterror(r)); | |
1386 | goto ERROR; | |
1387 | } | |
1388 | ||
1389 | // Allocate the netlink cache | |
1390 | r = rtnl_link_alloc_cache(nl, AF_UNSPEC, &cache); | |
1391 | if (r < 0) { | |
1392 | ERROR(jail->pakfire, "Unable to allocate netlink cache: %s\n", nl_geterror(r)); | |
1393 | goto ERROR; | |
1394 | } | |
1395 | ||
1396 | // Fetch loopback interface | |
1397 | link = rtnl_link_get_by_name(cache, "lo"); | |
1398 | if (!link) { | |
1399 | ERROR(jail->pakfire, "Could not find lo interface. Ignoring.\n"); | |
1400 | r = 0; | |
1401 | goto ERROR; | |
1402 | } | |
1403 | ||
1404 | // Allocate a new link | |
1405 | change = rtnl_link_alloc(); | |
1406 | if (!change) { | |
1407 | ERROR(jail->pakfire, "Could not allocate change link\n"); | |
1408 | r = 1; | |
1409 | goto ERROR; | |
1410 | } | |
1411 | ||
1412 | // Set the link to UP | |
1413 | rtnl_link_set_flags(change, IFF_UP); | |
1414 | ||
1415 | // Apply any changes | |
1416 | r = rtnl_link_change(nl, link, change, 0); | |
1417 | if (r) { | |
1418 | ERROR(jail->pakfire, "Unable to activate loopback: %s\n", nl_geterror(r)); | |
1419 | goto ERROR; | |
1420 | } | |
1421 | ||
1422 | // Success | |
1423 | r = 0; | |
1424 | ||
1425 | ERROR: | |
1426 | if (nl) | |
1427 | nl_socket_free(nl); | |
1428 | ||
1429 | return r; | |
1430 | } | |
1431 | ||
679ee2fa MT |
1432 | // UID/GID Mapping |
1433 | ||
679ee2fa MT |
1434 | static int pakfire_jail_setup_uid_mapping(struct pakfire_jail* jail, pid_t pid) { |
1435 | char path[PATH_MAX]; | |
1436 | int r; | |
1437 | ||
4896e62c MT |
1438 | // Skip mapping anything when running on / |
1439 | if (pakfire_on_root(jail->pakfire)) | |
1440 | return 0; | |
0f7f068b | 1441 | |
abe4ee37 MT |
1442 | // Make path |
1443 | r = pakfire_string_format(path, "/proc/%d/uid_map", pid); | |
1444 | if (r) | |
1445 | return r; | |
1446 | ||
1447 | // Fetch UID | |
1448 | const uid_t uid = pakfire_uid(jail->pakfire); | |
1449 | ||
4896e62c | 1450 | // Fetch SUBUID |
a1ff2863 | 1451 | const struct pakfire_subid* subuid = pakfire_subuid(jail->pakfire); |
4896e62c MT |
1452 | if (!subuid) |
1453 | return 1; | |
679ee2fa | 1454 | |
abe4ee37 | 1455 | /* When running as root, we will map the entire range. |
679ee2fa | 1456 | |
abe4ee37 MT |
1457 | When running as a non-privileged user, we will map the root user inside the jail |
1458 | to the user's UID outside of the jail, and we will map the rest starting from one. | |
1459 | */ | |
679ee2fa | 1460 | |
abe4ee37 MT |
1461 | // Running as root |
1462 | if (uid == 0) { | |
1463 | r = pakfire_file_write(jail->pakfire, path, 0, 0, 0, | |
1464 | "0 %lu %lu\n", subuid->id, subuid->length); | |
1465 | } else { | |
1466 | r = pakfire_file_write(jail->pakfire, path, 0, 0, 0, | |
b64888fa | 1467 | "0 %lu 1\n1 %lu %lu\n", uid, subuid->id, subuid->length); |
abe4ee37 MT |
1468 | } |
1469 | ||
1470 | if (r) { | |
1471 | ERROR(jail->pakfire, "Could not map UIDs: %m\n"); | |
1472 | return r; | |
1473 | } | |
1474 | ||
1475 | return r; | |
679ee2fa MT |
1476 | } |
1477 | ||
1478 | static int pakfire_jail_setup_gid_mapping(struct pakfire_jail* jail, pid_t pid) { | |
1479 | char path[PATH_MAX]; | |
1480 | int r; | |
1481 | ||
4896e62c MT |
1482 | // Skip mapping anything when running on / |
1483 | if (pakfire_on_root(jail->pakfire)) | |
1484 | return 0; | |
0f7f068b | 1485 | |
abe4ee37 MT |
1486 | // Fetch GID |
1487 | const gid_t gid = pakfire_gid(jail->pakfire); | |
1488 | ||
4896e62c | 1489 | // Fetch SUBGID |
a1ff2863 | 1490 | const struct pakfire_subid* subgid = pakfire_subgid(jail->pakfire); |
4896e62c MT |
1491 | if (!subgid) |
1492 | return 1; | |
679ee2fa MT |
1493 | |
1494 | // Make path | |
1495 | r = pakfire_string_format(path, "/proc/%d/gid_map", pid); | |
a60955af MT |
1496 | if (r) |
1497 | return r; | |
679ee2fa | 1498 | |
abe4ee37 MT |
1499 | // Running as root |
1500 | if (gid == 0) { | |
1501 | r = pakfire_file_write(jail->pakfire, path, 0, 0, 0, | |
1502 | "0 %lu %lu\n", subgid->id, subgid->length); | |
1503 | } else { | |
1504 | r = pakfire_file_write(jail->pakfire, path, 0, 0, 0, | |
1505 | "0 %lu 1\n%1 %lu %lu\n", gid, subgid->id, subgid->length); | |
1506 | } | |
679ee2fa | 1507 | |
abe4ee37 MT |
1508 | if (r) { |
1509 | ERROR(jail->pakfire, "Could not map GIDs: %m\n"); | |
1510 | return r; | |
1511 | } | |
1512 | ||
1513 | return r; | |
679ee2fa MT |
1514 | } |
1515 | ||
78d7488a MT |
1516 | static int pakfire_jail_setgroups(struct pakfire_jail* jail, pid_t pid) { |
1517 | char path[PATH_MAX]; | |
1518 | int r = 1; | |
1519 | ||
1520 | // Make path | |
1521 | r = pakfire_string_format(path, "/proc/%d/setgroups", pid); | |
a60955af MT |
1522 | if (r) |
1523 | return r; | |
78d7488a MT |
1524 | |
1525 | // Open file for writing | |
1526 | FILE* f = fopen(path, "w"); | |
1527 | if (!f) { | |
1528 | ERROR(jail->pakfire, "Could not open %s for writing: %m\n", path); | |
1529 | goto ERROR; | |
1530 | } | |
1531 | ||
1532 | // Write content | |
1533 | int bytes_written = fprintf(f, "deny\n"); | |
1534 | if (bytes_written <= 0) { | |
1535 | ERROR(jail->pakfire, "Could not write to %s: %m\n", path); | |
1536 | goto ERROR; | |
1537 | } | |
1538 | ||
1539 | r = fclose(f); | |
1540 | f = NULL; | |
1541 | if (r) { | |
1542 | ERROR(jail->pakfire, "Could not close %s: %m\n", path); | |
1543 | goto ERROR; | |
1544 | } | |
1545 | ||
1546 | ERROR: | |
1547 | if (f) | |
1548 | fclose(f); | |
1549 | ||
1550 | return r; | |
1551 | } | |
1552 | ||
43dc0e16 | 1553 | static int pakfire_jail_send_signal(struct pakfire_jail* jail, int fd) { |
743f449e MT |
1554 | const uint64_t val = 1; |
1555 | int r = 0; | |
43dc0e16 MT |
1556 | |
1557 | DEBUG(jail->pakfire, "Sending signal...\n"); | |
1558 | ||
743f449e MT |
1559 | // Write to the file descriptor |
1560 | ssize_t bytes_written = write(fd, &val, sizeof(val)); | |
1561 | if (bytes_written < 0 || (size_t)bytes_written < sizeof(val)) { | |
1562 | ERROR(jail->pakfire, "Could not send signal: %m\n"); | |
1563 | r = 1; | |
1564 | } | |
1565 | ||
1566 | // Close the file descriptor | |
43dc0e16 MT |
1567 | close(fd); |
1568 | ||
743f449e | 1569 | return r; |
43dc0e16 MT |
1570 | } |
1571 | ||
1572 | static int pakfire_jail_wait_for_signal(struct pakfire_jail* jail, int fd) { | |
743f449e MT |
1573 | uint64_t val = 0; |
1574 | int r = 0; | |
43dc0e16 MT |
1575 | |
1576 | DEBUG(jail->pakfire, "Waiting for signal...\n"); | |
1577 | ||
743f449e MT |
1578 | ssize_t bytes_read = read(fd, &val, sizeof(val)); |
1579 | if (bytes_read < 0 || (size_t)bytes_read < sizeof(val)) { | |
1580 | ERROR(jail->pakfire, "Error waiting for signal: %m\n"); | |
1581 | r = 1; | |
1582 | } | |
1583 | ||
1584 | // Close the file descriptor | |
43dc0e16 MT |
1585 | close(fd); |
1586 | ||
743f449e | 1587 | return r; |
43dc0e16 MT |
1588 | } |
1589 | ||
679ee2fa MT |
1590 | /* |
1591 | Performs the initialisation that needs to happen in the parent part | |
1592 | */ | |
f7d240a7 | 1593 | static int pakfire_jail_parent(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx) { |
679ee2fa MT |
1594 | int r; |
1595 | ||
abe4ee37 MT |
1596 | // Setup UID mapping |
1597 | r = pakfire_jail_setup_uid_mapping(jail, ctx->pid); | |
679ee2fa MT |
1598 | if (r) |
1599 | return r; | |
1600 | ||
abe4ee37 MT |
1601 | // Write "deny" to /proc/PID/setgroups |
1602 | r = pakfire_jail_setgroups(jail, ctx->pid); | |
78d7488a MT |
1603 | if (r) |
1604 | return r; | |
1605 | ||
679ee2fa | 1606 | // Setup GID mapping |
616f1fca | 1607 | r = pakfire_jail_setup_gid_mapping(jail, ctx->pid); |
679ee2fa MT |
1608 | if (r) |
1609 | return r; | |
1610 | ||
43dc0e16 MT |
1611 | // Parent has finished initialisation |
1612 | DEBUG(jail->pakfire, "Parent has finished initialization\n"); | |
1613 | ||
1614 | // Send signal to client | |
f7d240a7 | 1615 | r = pakfire_jail_send_signal(jail, ctx->completed_fd); |
43dc0e16 MT |
1616 | if (r) |
1617 | return r; | |
1618 | ||
679ee2fa MT |
1619 | return 0; |
1620 | } | |
1621 | ||
14df7388 MT |
1622 | static int pakfire_jail_switch_root(struct pakfire_jail* jail, const char* root) { |
1623 | int r; | |
1624 | ||
1625 | // Change to the new root | |
1626 | r = chdir(root); | |
1627 | if (r) { | |
1628 | ERROR(jail->pakfire, "chdir(%s) failed: %m\n", root); | |
1629 | return r; | |
1630 | } | |
1631 | ||
1632 | // Switch Root! | |
1633 | r = pivot_root(".", "."); | |
1634 | if (r) { | |
1635 | ERROR(jail->pakfire, "Failed changing into the new root directory %s: %m\n", root); | |
1636 | return r; | |
1637 | } | |
1638 | ||
1639 | // Umount the old root | |
1640 | r = umount2(".", MNT_DETACH); | |
1641 | if (r) { | |
1642 | ERROR(jail->pakfire, "Could not umount the old root filesystem: %m\n"); | |
1643 | return r; | |
1644 | } | |
1645 | ||
1646 | return 0; | |
1647 | } | |
1648 | ||
616f1fca | 1649 | static int pakfire_jail_child(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx, |
f7d240a7 | 1650 | const char* argv[]) { |
43dc0e16 MT |
1651 | int r; |
1652 | ||
e33387d3 | 1653 | // Redirect any logging to our log pipe |
a13df023 | 1654 | pakfire_ctx_set_log_callback(jail->ctx, pakfire_jail_log_redirect, &ctx->pipes); |
0bd84dc1 | 1655 | |
cf440db8 MT |
1656 | // Fetch my own PID |
1657 | pid_t pid = getpid(); | |
1658 | ||
1659 | DEBUG(jail->pakfire, "Launched child process in jail with PID %d\n", pid); | |
0bd84dc1 | 1660 | |
43dc0e16 | 1661 | // Wait for the parent to finish initialization |
f7d240a7 | 1662 | r = pakfire_jail_wait_for_signal(jail, ctx->completed_fd); |
43dc0e16 MT |
1663 | if (r) |
1664 | return r; | |
1665 | ||
90503c53 MT |
1666 | // Die with parent |
1667 | r = prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); | |
1668 | if (r) { | |
1669 | ERROR(jail->pakfire, "Could not configure to die with parent: %m\n"); | |
1670 | return 126; | |
1671 | } | |
1672 | ||
1673 | // Make this process dumpable | |
1674 | r = prctl (PR_SET_DUMPABLE, 1, 0, 0, 0); | |
1675 | if (r) { | |
1676 | ERROR(jail->pakfire, "Could not make the process dumpable: %m\n"); | |
1677 | return 126; | |
1678 | } | |
1679 | ||
1680 | // Don't drop any capabilities on setuid() | |
1681 | r = prctl(PR_SET_KEEPCAPS, 1); | |
1682 | if (r) { | |
1683 | ERROR(jail->pakfire, "Could not set PR_SET_KEEPCAPS: %m\n"); | |
1684 | return 126; | |
1685 | } | |
4f59c39b MT |
1686 | |
1687 | // Fetch UID/GID | |
1688 | uid_t uid = getuid(); | |
1689 | gid_t gid = getgid(); | |
1690 | ||
1691 | // Fetch EUID/EGID | |
1692 | uid_t euid = geteuid(); | |
1693 | gid_t egid = getegid(); | |
1694 | ||
a8a41064 MT |
1695 | DEBUG(jail->pakfire, " UID: %u (effective %u)\n", uid, euid); |
1696 | DEBUG(jail->pakfire, " GID: %u (effective %u)\n", gid, egid); | |
4f59c39b MT |
1697 | |
1698 | // Check if we are (effectively running as root) | |
4f719e21 | 1699 | if (uid || gid || euid || egid) { |
4f59c39b MT |
1700 | ERROR(jail->pakfire, "Child process is not running as root\n"); |
1701 | return 126; | |
1702 | } | |
1703 | ||
1704 | const char* root = pakfire_get_path(jail->pakfire); | |
652f2a99 | 1705 | const char* arch = pakfire_get_effective_arch(jail->pakfire); |
4f59c39b | 1706 | |
9f558f7d MT |
1707 | // Change mount propagation to slave to receive anything from the parent namespace |
1708 | r = pakfire_mount_change_propagation(jail->pakfire, MS_SLAVE, "/"); | |
1709 | if (r) | |
1710 | return r; | |
1711 | ||
14df7388 MT |
1712 | // Make root a mountpoint in the new mount namespace |
1713 | r = pakfire_mount_make_mounpoint(jail->pakfire, root); | |
1714 | if (r) | |
1715 | return r; | |
1716 | ||
9f558f7d MT |
1717 | // Change mount propagation to private |
1718 | r = pakfire_mount_change_propagation(jail->pakfire, MS_PRIVATE, root); | |
1719 | if (r) | |
1720 | return r; | |
1721 | ||
4f59c39b MT |
1722 | // Change root (unless root is /) |
1723 | if (!pakfire_on_root(jail->pakfire)) { | |
1724 | // Mount everything | |
7bdf1d8e | 1725 | r = pakfire_jail_mount(jail, ctx); |
4f59c39b MT |
1726 | if (r) |
1727 | return r; | |
1728 | ||
14df7388 MT |
1729 | // chroot() |
1730 | r = pakfire_jail_switch_root(jail, root); | |
1731 | if (r) | |
1732 | return r; | |
4f59c39b MT |
1733 | } |
1734 | ||
90d92b5c MT |
1735 | // Set personality |
1736 | unsigned long persona = pakfire_arch_personality(arch); | |
1737 | if (persona) { | |
1738 | r = personality(persona); | |
1739 | if (r < 0) { | |
1740 | ERROR(jail->pakfire, "Could not set personality (%x)\n", (unsigned int)persona); | |
1741 | return 1; | |
1742 | } | |
1743 | } | |
1744 | ||
fec79a33 MT |
1745 | // Setup networking |
1746 | if (!pakfire_jail_exec_has_flag(ctx, PAKFIRE_JAIL_HAS_NETWORKING)) { | |
1747 | r = pakfire_jail_setup_loopback(jail); | |
1748 | if (r) | |
1749 | return 1; | |
1750 | } | |
1751 | ||
cf440db8 MT |
1752 | // Set nice level |
1753 | if (jail->nice) { | |
1754 | DEBUG(jail->pakfire, "Setting nice level to %d\n", jail->nice); | |
1755 | ||
1756 | r = setpriority(PRIO_PROCESS, pid, jail->nice); | |
1757 | if (r) { | |
1758 | ERROR(jail->pakfire, "Could not set nice level: %m\n"); | |
1759 | return 1; | |
1760 | } | |
1761 | } | |
1762 | ||
e33387d3 MT |
1763 | // Close other end of log pipes |
1764 | close(ctx->pipes.log_INFO[0]); | |
1765 | close(ctx->pipes.log_ERROR[0]); | |
1766 | #ifdef ENABLE_DEBUG | |
1767 | close(ctx->pipes.log_DEBUG[0]); | |
1768 | #endif /* ENABLE_DEBUG */ | |
1769 | ||
2015cb92 | 1770 | // Connect standard input |
bca69274 | 1771 | if (ctx->pipes.stdin[0] >= 0) { |
2015cb92 MT |
1772 | r = dup2(ctx->pipes.stdin[0], STDIN_FILENO); |
1773 | if (r < 0) { | |
1774 | ERROR(jail->pakfire, "Could not connect fd %d to stdin: %m\n", | |
1775 | ctx->pipes.stdin[0]); | |
1776 | ||
1777 | return 1; | |
1778 | } | |
1779 | } | |
1780 | ||
7ebfb7cb | 1781 | // Connect standard output and error |
bca69274 | 1782 | if (ctx->pipes.stdout[1] >= 0 && ctx->pipes.stderr[1] >= 0) { |
7ebfb7cb MT |
1783 | r = dup2(ctx->pipes.stdout[1], STDOUT_FILENO); |
1784 | if (r < 0) { | |
1785 | ERROR(jail->pakfire, "Could not connect fd %d to stdout: %m\n", | |
1786 | ctx->pipes.stdout[1]); | |
1787 | ||
1788 | return 1; | |
1789 | } | |
1790 | ||
1791 | r = dup2(ctx->pipes.stderr[1], STDERR_FILENO); | |
1792 | if (r < 0) { | |
1793 | ERROR(jail->pakfire, "Could not connect fd %d to stderr: %m\n", | |
1794 | ctx->pipes.stderr[1]); | |
1795 | ||
1796 | return 1; | |
1797 | } | |
1798 | ||
195fe455 | 1799 | // Close the pipe (as we have moved the original file descriptors) |
2015cb92 | 1800 | pakfire_jail_close_pipe(jail, ctx->pipes.stdin); |
195fe455 MT |
1801 | pakfire_jail_close_pipe(jail, ctx->pipes.stdout); |
1802 | pakfire_jail_close_pipe(jail, ctx->pipes.stderr); | |
7ebfb7cb MT |
1803 | } |
1804 | ||
007bc66c MT |
1805 | // Reset open file limit (http://0pointer.net/blog/file-descriptor-limits.html) |
1806 | r = pakfire_rlimit_reset_nofile(jail->pakfire); | |
1807 | if (r) | |
1808 | return r; | |
1809 | ||
e6791c52 MT |
1810 | // Set capabilities |
1811 | r = pakfire_jail_set_capabilities(jail); | |
1812 | if (r) | |
1813 | return r; | |
1814 | ||
1815 | // Show capabilities | |
1816 | r = pakfire_jail_show_capabilities(jail); | |
980b15af MT |
1817 | if (r) |
1818 | return r; | |
1819 | ||
739d5b57 MT |
1820 | // Filter syscalls |
1821 | r = pakfire_jail_limit_syscalls(jail); | |
1822 | if (r) | |
1823 | return r; | |
1824 | ||
2015cb92 MT |
1825 | DEBUG(jail->pakfire, "Child process initialization done\n"); |
1826 | DEBUG(jail->pakfire, "Launching command:\n"); | |
1827 | ||
1828 | // Log argv | |
1829 | for (unsigned int i = 0; argv[i]; i++) | |
a8a41064 | 1830 | DEBUG(jail->pakfire, " argv[%u] = %s\n", i, argv[i]); |
2015cb92 | 1831 | |
b3498aeb MT |
1832 | // exec() command |
1833 | r = execvpe(argv[0], (char**)argv, jail->env); | |
9fa1afb6 MT |
1834 | if (r < 0) { |
1835 | // Translate errno into regular exit code | |
1836 | switch (errno) { | |
1837 | case ENOENT: | |
1838 | // Ignore if the command doesn't exist | |
1839 | if (ctx->flags & PAKFIRE_JAIL_NOENT_OK) | |
1840 | r = 0; | |
1841 | else | |
1842 | r = 127; | |
b3498aeb | 1843 | |
9fa1afb6 | 1844 | break; |
b3498aeb | 1845 | |
9fa1afb6 MT |
1846 | default: |
1847 | r = 1; | |
1848 | } | |
1849 | ||
1850 | ERROR(jail->pakfire, "Could not execve(%s): %m\n", argv[0]); | |
b3498aeb MT |
1851 | } |
1852 | ||
1853 | // We should not get here | |
1854 | return r; | |
0bd84dc1 MT |
1855 | } |
1856 | ||
9f50bf71 | 1857 | // Run a command in the jail |
db4f234f | 1858 | static int __pakfire_jail_exec(struct pakfire_jail* jail, const char* argv[], |
2015cb92 MT |
1859 | const int interactive, |
1860 | pakfire_jail_communicate_in communicate_in, | |
1861 | pakfire_jail_communicate_out communicate_out, | |
9fa1afb6 | 1862 | void* data, int flags) { |
4f59c39b | 1863 | int exit = -1; |
0bd84dc1 MT |
1864 | int r; |
1865 | ||
b3498aeb MT |
1866 | // Check if argv is valid |
1867 | if (!argv || !argv[0]) { | |
1868 | errno = EINVAL; | |
1869 | return -1; | |
1870 | } | |
1871 | ||
616f1fca MT |
1872 | // Initialize context for this call |
1873 | struct pakfire_jail_exec ctx = { | |
9fa1afb6 | 1874 | .flags = flags, |
7bdf1d8e | 1875 | |
616f1fca | 1876 | .pipes = { |
4c3bab92 MT |
1877 | .stdin = { -1, -1 }, |
1878 | .stdout = { -1, -1 }, | |
1879 | .stderr = { -1, -1 }, | |
1880 | .log_INFO = { -1, -1 }, | |
1881 | .log_ERROR = { -1, -1 }, | |
1882 | .log_DEBUG = { -1, -1 }, | |
2015cb92 MT |
1883 | }, |
1884 | ||
1885 | .communicate = { | |
1886 | .in = communicate_in, | |
1887 | .out = communicate_out, | |
1888 | .data = data, | |
616f1fca | 1889 | }, |
d2eaf8dc MT |
1890 | |
1891 | .pidfd = -1, | |
616f1fca MT |
1892 | }; |
1893 | ||
0bd84dc1 MT |
1894 | DEBUG(jail->pakfire, "Executing jail...\n"); |
1895 | ||
7bdf1d8e MT |
1896 | // Enable networking in interactive mode |
1897 | if (interactive) | |
1898 | ctx.flags |= PAKFIRE_JAIL_HAS_NETWORKING; | |
1899 | ||
43dc0e16 MT |
1900 | /* |
1901 | Setup a file descriptor which can be used to notify the client that the parent | |
1902 | has completed configuration. | |
1903 | */ | |
f7d240a7 MT |
1904 | ctx.completed_fd = eventfd(0, EFD_CLOEXEC); |
1905 | if (ctx.completed_fd < 0) { | |
43dc0e16 MT |
1906 | ERROR(jail->pakfire, "eventfd() failed: %m\n"); |
1907 | return -1; | |
1908 | } | |
1909 | ||
616f1fca | 1910 | // Create pipes to communicate with child process if we are not running interactively |
58963c75 | 1911 | if (!interactive) { |
2015cb92 MT |
1912 | // stdin (only if callback is set) |
1913 | if (ctx.communicate.in) { | |
1914 | r = pakfire_jail_setup_pipe(jail, &ctx.pipes.stdin, 0); | |
1915 | if (r) | |
1916 | goto ERROR; | |
1917 | } | |
1918 | ||
616f1fca | 1919 | // stdout |
e33387d3 MT |
1920 | r = pakfire_jail_setup_pipe(jail, &ctx.pipes.stdout, 0); |
1921 | if (r) | |
616f1fca | 1922 | goto ERROR; |
616f1fca MT |
1923 | |
1924 | // stderr | |
e33387d3 MT |
1925 | r = pakfire_jail_setup_pipe(jail, &ctx.pipes.stderr, 0); |
1926 | if (r) | |
616f1fca | 1927 | goto ERROR; |
616f1fca MT |
1928 | } |
1929 | ||
e33387d3 MT |
1930 | // Setup pipes for logging |
1931 | // INFO | |
1932 | r = pakfire_jail_setup_pipe(jail, &ctx.pipes.log_INFO, O_CLOEXEC); | |
1933 | if (r) | |
1934 | goto ERROR; | |
1935 | ||
1936 | // ERROR | |
1937 | r = pakfire_jail_setup_pipe(jail, &ctx.pipes.log_ERROR, O_CLOEXEC); | |
1938 | if (r) | |
1939 | goto ERROR; | |
1940 | ||
1941 | #ifdef ENABLE_DEBUG | |
1942 | // DEBUG | |
1943 | r = pakfire_jail_setup_pipe(jail, &ctx.pipes.log_DEBUG, O_CLOEXEC); | |
1944 | if (r) | |
1945 | goto ERROR; | |
1946 | #endif /* ENABLE_DEBUG */ | |
1947 | ||
0bd84dc1 MT |
1948 | // Configure child process |
1949 | struct clone_args args = { | |
1950 | .flags = | |
1951 | CLONE_NEWCGROUP | | |
1952 | CLONE_NEWIPC | | |
1953 | CLONE_NEWNS | | |
1954 | CLONE_NEWPID | | |
e688e305 | 1955 | CLONE_NEWTIME | |
0bd84dc1 | 1956 | CLONE_NEWUSER | |
d853213d | 1957 | CLONE_NEWUTS | |
02fd4f8b | 1958 | CLONE_PIDFD, |
0bd84dc1 | 1959 | .exit_signal = SIGCHLD, |
d853213d | 1960 | .pidfd = (long long unsigned int)&ctx.pidfd, |
0bd84dc1 MT |
1961 | }; |
1962 | ||
aca565fc | 1963 | // Launch the process in a cgroup that is a leaf of the configured cgroup |
02fd4f8b MT |
1964 | if (jail->cgroup) { |
1965 | args.flags |= CLONE_INTO_CGROUP; | |
1966 | ||
ae5201c5 MT |
1967 | // Fetch our UUID |
1968 | const char* uuid = pakfire_jail_uuid(jail); | |
aca565fc MT |
1969 | |
1970 | // Create a temporary cgroup | |
ae5201c5 | 1971 | r = pakfire_cgroup_child(&ctx.cgroup, jail->cgroup, uuid, 0); |
aca565fc MT |
1972 | if (r) { |
1973 | ERROR(jail->pakfire, "Could not create cgroup for jail: %m\n"); | |
1974 | goto ERROR; | |
1975 | } | |
1976 | ||
02fd4f8b | 1977 | // Clone into this cgroup |
aca565fc | 1978 | args.cgroup = pakfire_cgroup_fd(ctx.cgroup); |
02fd4f8b MT |
1979 | } |
1980 | ||
7bdf1d8e MT |
1981 | // Setup networking |
1982 | if (!pakfire_jail_exec_has_flag(&ctx, PAKFIRE_JAIL_HAS_NETWORKING)) { | |
1983 | args.flags |= CLONE_NEWNET; | |
1984 | } | |
1985 | ||
0bd84dc1 | 1986 | // Fork this process |
616f1fca MT |
1987 | ctx.pid = clone3(&args, sizeof(args)); |
1988 | if (ctx.pid < 0) { | |
0bd84dc1 MT |
1989 | ERROR(jail->pakfire, "Could not clone: %m\n"); |
1990 | return -1; | |
1991 | ||
1992 | // Child process | |
616f1fca | 1993 | } else if (ctx.pid == 0) { |
f7d240a7 | 1994 | r = pakfire_jail_child(jail, &ctx, argv); |
0bd84dc1 MT |
1995 | _exit(r); |
1996 | } | |
1997 | ||
679ee2fa | 1998 | // Parent process |
f7d240a7 | 1999 | r = pakfire_jail_parent(jail, &ctx); |
679ee2fa MT |
2000 | if (r) |
2001 | goto ERROR; | |
2002 | ||
616f1fca | 2003 | DEBUG(jail->pakfire, "Waiting for PID %d to finish its work\n", ctx.pid); |
0bd84dc1 | 2004 | |
616f1fca | 2005 | // Read output of the child process |
d853213d MT |
2006 | r = pakfire_jail_wait(jail, &ctx); |
2007 | if (r) | |
2008 | goto ERROR; | |
0bd84dc1 | 2009 | |
d853213d MT |
2010 | // Handle exit status |
2011 | switch (ctx.status.si_code) { | |
2012 | case CLD_EXITED: | |
2013 | DEBUG(jail->pakfire, "The child process exited with code %d\n", | |
2014 | ctx.status.si_status); | |
616f1fca | 2015 | |
d853213d MT |
2016 | // Pass exit code |
2017 | exit = ctx.status.si_status; | |
2018 | break; | |
0bd84dc1 | 2019 | |
d853213d | 2020 | case CLD_KILLED: |
d853213d | 2021 | ERROR(jail->pakfire, "The child process was killed\n"); |
54f64dc5 MT |
2022 | exit = 139; |
2023 | break; | |
2024 | ||
2025 | case CLD_DUMPED: | |
2026 | ERROR(jail->pakfire, "The child process terminated abnormally\n"); | |
d853213d | 2027 | break; |
0bd84dc1 | 2028 | |
d853213d MT |
2029 | // Log anything else |
2030 | default: | |
2031 | ERROR(jail->pakfire, "Unknown child exit code: %d\n", ctx.status.si_code); | |
2032 | break; | |
0bd84dc1 MT |
2033 | } |
2034 | ||
679ee2fa | 2035 | ERROR: |
aca565fc MT |
2036 | // Destroy the temporary cgroup (if any) |
2037 | if (ctx.cgroup) { | |
6b7cf275 MT |
2038 | // Read cgroup stats |
2039 | r = pakfire_cgroup_stat(ctx.cgroup, &ctx.cgroup_stats); | |
2040 | if (r) { | |
2041 | ERROR(jail->pakfire, "Could not read cgroup stats: %m\n"); | |
2042 | } else { | |
2043 | pakfire_cgroup_stat_dump(ctx.cgroup, &ctx.cgroup_stats); | |
2044 | } | |
2045 | ||
aca565fc MT |
2046 | pakfire_cgroup_destroy(ctx.cgroup); |
2047 | pakfire_cgroup_unref(ctx.cgroup); | |
2048 | } | |
2049 | ||
616f1fca | 2050 | // Close any file descriptors |
2015cb92 | 2051 | pakfire_jail_close_pipe(jail, ctx.pipes.stdin); |
e33387d3 MT |
2052 | pakfire_jail_close_pipe(jail, ctx.pipes.stdout); |
2053 | pakfire_jail_close_pipe(jail, ctx.pipes.stderr); | |
dd2d7dbb | 2054 | if (ctx.pidfd >= 0) |
d853213d | 2055 | close(ctx.pidfd); |
e33387d3 MT |
2056 | pakfire_jail_close_pipe(jail, ctx.pipes.log_INFO); |
2057 | pakfire_jail_close_pipe(jail, ctx.pipes.log_ERROR); | |
2058 | pakfire_jail_close_pipe(jail, ctx.pipes.log_DEBUG); | |
616f1fca | 2059 | |
4f59c39b | 2060 | return exit; |
9f50bf71 | 2061 | } |
a45ed6b0 | 2062 | |
ccdd2e95 | 2063 | PAKFIRE_EXPORT int pakfire_jail_exec( |
2015cb92 MT |
2064 | struct pakfire_jail* jail, |
2065 | const char* argv[], | |
2066 | pakfire_jail_communicate_in callback_in, | |
2067 | pakfire_jail_communicate_out callback_out, | |
9fa1afb6 MT |
2068 | void* data, int flags) { |
2069 | return __pakfire_jail_exec(jail, argv, 0, callback_in, callback_out, data, flags); | |
2015cb92 MT |
2070 | } |
2071 | ||
db4f234f | 2072 | static int pakfire_jail_exec_interactive( |
9fa1afb6 | 2073 | struct pakfire_jail* jail, const char* argv[], int flags) { |
db4f234f MT |
2074 | int r; |
2075 | ||
2076 | // Setup interactive stuff | |
2077 | r = pakfire_jail_setup_interactive_env(jail); | |
2078 | if (r) | |
2079 | return r; | |
2080 | ||
9fa1afb6 | 2081 | return __pakfire_jail_exec(jail, argv, 1, NULL, NULL, NULL, flags); |
db4f234f MT |
2082 | } |
2083 | ||
ccdd2e95 MT |
2084 | int pakfire_jail_exec_script(struct pakfire_jail* jail, |
2085 | const char* script, | |
2086 | const size_t size, | |
2087 | const char* args[], | |
2088 | pakfire_jail_communicate_in callback_in, | |
2089 | pakfire_jail_communicate_out callback_out, | |
2090 | void* data) { | |
a45ed6b0 MT |
2091 | char path[PATH_MAX]; |
2092 | const char** argv = NULL; | |
35291cb7 | 2093 | FILE* f = NULL; |
a45ed6b0 MT |
2094 | int r; |
2095 | ||
2096 | const char* root = pakfire_get_path(jail->pakfire); | |
2097 | ||
2098 | // Write the scriptlet to disk | |
819232d6 | 2099 | r = pakfire_path_append(path, root, PAKFIRE_TMP_DIR "/pakfire-script.XXXXXX"); |
56796f84 | 2100 | if (r) |
a45ed6b0 MT |
2101 | goto ERROR; |
2102 | ||
35291cb7 MT |
2103 | // Create a temporary file |
2104 | f = pakfire_mktemp(path, 0700); | |
2105 | if (!f) { | |
2106 | ERROR(jail->pakfire, "Could not create temporary file: %m\n"); | |
a45ed6b0 MT |
2107 | goto ERROR; |
2108 | } | |
2109 | ||
2110 | DEBUG(jail->pakfire, "Writing script to %s:\n%.*s\n", path, (int)size, script); | |
2111 | ||
2112 | // Write data | |
35291cb7 MT |
2113 | r = fprintf(f, "%s", script); |
2114 | if (r < 0) { | |
a45ed6b0 | 2115 | ERROR(jail->pakfire, "Could not write script to file %s: %m\n", path); |
a45ed6b0 MT |
2116 | goto ERROR; |
2117 | } | |
2118 | ||
2119 | // Close file | |
35291cb7 | 2120 | r = fclose(f); |
a45ed6b0 MT |
2121 | if (r) { |
2122 | ERROR(jail->pakfire, "Could not close script file %s: %m\n", path); | |
a45ed6b0 MT |
2123 | goto ERROR; |
2124 | } | |
2125 | ||
35291cb7 MT |
2126 | f = NULL; |
2127 | ||
a45ed6b0 MT |
2128 | // Count how many arguments were passed |
2129 | unsigned int argc = 1; | |
2130 | if (args) { | |
2131 | for (const char** arg = args; *arg; arg++) | |
2132 | argc++; | |
2133 | } | |
2134 | ||
2135 | argv = calloc(argc + 1, sizeof(*argv)); | |
2136 | if (!argv) { | |
2137 | ERROR(jail->pakfire, "Could not allocate argv: %m\n"); | |
2138 | goto ERROR; | |
2139 | } | |
2140 | ||
2141 | // Set command | |
2142 | argv[0] = (root) ? pakfire_path_relpath(root, path) : path; | |
2143 | ||
2144 | // Copy args | |
2145 | for (unsigned int i = 1; i < argc; i++) | |
2146 | argv[i] = args[i-1]; | |
2147 | ||
2148 | // Run the script | |
9fa1afb6 | 2149 | r = pakfire_jail_exec(jail, argv, callback_in, callback_out, data, 0); |
a45ed6b0 MT |
2150 | |
2151 | ERROR: | |
2152 | if (argv) | |
2153 | free(argv); | |
35291cb7 MT |
2154 | if (f) |
2155 | fclose(f); | |
a45ed6b0 MT |
2156 | |
2157 | // Remove script from disk | |
2158 | if (*path) | |
2159 | unlink(path); | |
2160 | ||
2161 | return r; | |
2162 | } | |
82df3c77 MT |
2163 | |
2164 | /* | |
2165 | A convenience function that creates a new jail, runs the given command and destroys | |
2166 | the jail again. | |
2167 | */ | |
12b9b39f | 2168 | int pakfire_jail_run(struct pakfire* pakfire, const char* argv[], int flags, char** output) { |
82df3c77 MT |
2169 | struct pakfire_jail* jail = NULL; |
2170 | int r; | |
2171 | ||
2172 | // Create a new jail | |
9fa1afb6 | 2173 | r = pakfire_jail_create(&jail, pakfire); |
82df3c77 MT |
2174 | if (r) |
2175 | goto ERROR; | |
2176 | ||
2177 | // Execute the command | |
9fa1afb6 | 2178 | r = pakfire_jail_exec(jail, argv, NULL, pakfire_jail_capture_stdout, output, 0); |
82df3c77 MT |
2179 | |
2180 | ERROR: | |
2181 | if (jail) | |
2182 | pakfire_jail_unref(jail); | |
2183 | ||
2184 | return r; | |
2185 | } | |
4f688bd8 MT |
2186 | |
2187 | int pakfire_jail_run_script(struct pakfire* pakfire, | |
49a9babc | 2188 | const char* script, const size_t length, const char* argv[], int flags) { |
4f688bd8 MT |
2189 | struct pakfire_jail* jail = NULL; |
2190 | int r; | |
2191 | ||
2192 | // Create a new jail | |
9fa1afb6 | 2193 | r = pakfire_jail_create(&jail, pakfire); |
4f688bd8 MT |
2194 | if (r) |
2195 | goto ERROR; | |
2196 | ||
2197 | // Execute the command | |
49a9babc | 2198 | r = pakfire_jail_exec_script(jail, script, length, argv, NULL, NULL, NULL); |
4f688bd8 MT |
2199 | |
2200 | ERROR: | |
2201 | if (jail) | |
2202 | pakfire_jail_unref(jail); | |
2203 | ||
2204 | return r; | |
2205 | } | |
e43489f7 | 2206 | |
5f6e42a2 | 2207 | int pakfire_jail_shell(struct pakfire_jail* jail) { |
42a41fdf MT |
2208 | int r; |
2209 | ||
e43489f7 MT |
2210 | const char* argv[] = { |
2211 | "/bin/bash", "--login", NULL, | |
2212 | }; | |
2213 | ||
2214 | // Execute /bin/bash | |
42a41fdf MT |
2215 | r = pakfire_jail_exec_interactive(jail, argv, 0); |
2216 | ||
2217 | // Raise any errors | |
2218 | if (r < 0) | |
2219 | return r; | |
2220 | ||
2221 | // Ignore any return codes from the shell | |
2222 | return 0; | |
e43489f7 MT |
2223 | } |
2224 | ||
f7ffbb93 | 2225 | static int pakfire_jail_run_if_possible(struct pakfire* pakfire, const char** argv) { |
e43489f7 | 2226 | char path[PATH_MAX]; |
f7ffbb93 | 2227 | int r; |
e43489f7 | 2228 | |
f7ffbb93 | 2229 | r = pakfire_path(pakfire, path, "%s", *argv); |
77e26129 MT |
2230 | if (r) |
2231 | return r; | |
e43489f7 | 2232 | |
f7ffbb93 | 2233 | // Check if the file is executable |
e43489f7 MT |
2234 | r = access(path, X_OK); |
2235 | if (r) { | |
f7ffbb93 | 2236 | DEBUG(pakfire, "%s is not executable. Skipping...\n", *argv); |
e43489f7 MT |
2237 | return 0; |
2238 | } | |
2239 | ||
f7ffbb93 MT |
2240 | return pakfire_jail_run(pakfire, argv, 0, NULL); |
2241 | } | |
2242 | ||
2243 | int pakfire_jail_ldconfig(struct pakfire* pakfire) { | |
e43489f7 | 2244 | const char* argv[] = { |
f7ffbb93 MT |
2245 | "/sbin/ldconfig", |
2246 | NULL, | |
e43489f7 MT |
2247 | }; |
2248 | ||
f7ffbb93 MT |
2249 | return pakfire_jail_run_if_possible(pakfire, argv); |
2250 | } | |
2251 | ||
2252 | int pakfire_jail_run_systemd_tmpfiles(struct pakfire* pakfire) { | |
2253 | const char* argv[] = { | |
2254 | "/usr/bin/systemd-tmpfiles", | |
2255 | "--create", | |
2256 | NULL, | |
2257 | }; | |
2258 | ||
2259 | return pakfire_jail_run_if_possible(pakfire, argv); | |
e43489f7 | 2260 | } |