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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 | ||
21 | #include <errno.h> | |
22 | #include <fcntl.h> | |
23 | #include <linux/capability.h> | |
24 | #include <linux/sched.h> | |
25 | #include <sys/wait.h> | |
26 | #include <linux/wait.h> | |
27 | #include <sched.h> | |
28 | #include <signal.h> | |
29 | #include <stdlib.h> | |
30 | #include <syscall.h> | |
31 | #include <sys/capability.h> | |
32 | #include <sys/epoll.h> | |
33 | #include <sys/eventfd.h> | |
34 | #include <sys/mount.h> | |
35 | #include <sys/personality.h> | |
36 | #include <sys/prctl.h> | |
37 | #include <sys/resource.h> | |
38 | #include <sys/timerfd.h> | |
39 | #include <sys/types.h> | |
40 | #include <sys/wait.h> | |
41 | #include <termios.h> | |
42 | ||
43 | // libnl3 | |
44 | #include <net/if.h> | |
45 | #include <netlink/route/link.h> | |
46 | ||
47 | // libseccomp | |
48 | #include <seccomp.h> | |
49 | ||
50 | // libuuid | |
51 | #include <uuid.h> | |
52 | ||
53 | #include <pakfire/arch.h> | |
54 | #include <pakfire/cgroup.h> | |
55 | #include <pakfire/jail.h> | |
56 | #include <pakfire/logging.h> | |
57 | #include <pakfire/mount.h> | |
58 | #include <pakfire/pakfire.h> | |
59 | #include <pakfire/path.h> | |
60 | #include <pakfire/private.h> | |
61 | #include <pakfire/pwd.h> | |
62 | #include <pakfire/string.h> | |
63 | #include <pakfire/util.h> | |
64 | ||
65 | #define BUFFER_SIZE 1024 * 64 | |
66 | #define ENVIRON_SIZE 128 | |
67 | #define EPOLL_MAX_EVENTS 2 | |
68 | #define MAX_MOUNTPOINTS 8 | |
69 | ||
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[] = { | |
75 | { "HOME", "/root" }, | |
76 | { "LANG", "C.utf-8" }, | |
77 | { "PATH", "/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin", }, | |
78 | { "TERM", "vt100" }, | |
79 | ||
80 | // Tell everything that it is running inside a Pakfire container | |
81 | { "container", "pakfire" }, | |
82 | { NULL, NULL }, | |
83 | }; | |
84 | ||
85 | struct pakfire_jail_mountpoint { | |
86 | char source[PATH_MAX]; | |
87 | char target[PATH_MAX]; | |
88 | int flags; | |
89 | }; | |
90 | ||
91 | struct pakfire_jail { | |
92 | struct pakfire_ctx* ctx; | |
93 | struct pakfire* pakfire; | |
94 | int nrefs; | |
95 | ||
96 | // A unique ID for each jail | |
97 | uuid_t uuid; | |
98 | char __uuid[UUID_STR_LEN]; | |
99 | ||
100 | // Resource Limits | |
101 | int nice; | |
102 | ||
103 | // Timeout | |
104 | struct itimerspec timeout; | |
105 | ||
106 | // CGroup | |
107 | struct pakfire_cgroup* cgroup; | |
108 | ||
109 | // Environment | |
110 | char* env[ENVIRON_SIZE]; | |
111 | ||
112 | // Mountpoints | |
113 | struct pakfire_jail_mountpoint mountpoints[MAX_MOUNTPOINTS]; | |
114 | unsigned int num_mountpoints; | |
115 | ||
116 | // Callbacks | |
117 | struct pakfire_jail_callbacks { | |
118 | // Log | |
119 | pakfire_jail_log_callback log; | |
120 | void* log_data; | |
121 | } callbacks; | |
122 | }; | |
123 | ||
124 | struct pakfire_log_buffer { | |
125 | char data[BUFFER_SIZE]; | |
126 | size_t used; | |
127 | }; | |
128 | ||
129 | struct pakfire_jail_exec { | |
130 | int flags; | |
131 | ||
132 | // PID (of the child) | |
133 | pid_t pid; | |
134 | int pidfd; | |
135 | ||
136 | // Socket to pass FDs | |
137 | int socket[2]; | |
138 | ||
139 | // Process status (from waitid) | |
140 | siginfo_t status; | |
141 | ||
142 | // FD to notify the client that the parent has finished initialization | |
143 | int completed_fd; | |
144 | ||
145 | // Log pipes | |
146 | struct pakfire_jail_pipes { | |
147 | // Logging | |
148 | int log_INFO[2]; | |
149 | int log_ERROR[2]; | |
150 | #ifdef ENABLE_DEBUG | |
151 | int log_DEBUG[2]; | |
152 | #endif /* ENABLE_DEBUG */ | |
153 | } pipes; | |
154 | ||
155 | // Communicate | |
156 | struct pakfire_jail_communicate { | |
157 | pakfire_jail_communicate_in in; | |
158 | pakfire_jail_communicate_out out; | |
159 | void* data; | |
160 | } communicate; | |
161 | ||
162 | // Log buffers | |
163 | struct pakfire_jail_buffers { | |
164 | struct pakfire_log_buffer stdout; | |
165 | struct pakfire_log_buffer stderr; | |
166 | ||
167 | // Logging | |
168 | struct pakfire_log_buffer log_INFO; | |
169 | struct pakfire_log_buffer log_ERROR; | |
170 | #ifdef ENABLE_DEBUG | |
171 | struct pakfire_log_buffer log_DEBUG; | |
172 | #endif /* ENABLE_DEBUG */ | |
173 | } buffers; | |
174 | ||
175 | struct pakfire_cgroup* cgroup; | |
176 | struct pakfire_cgroup_stats cgroup_stats; | |
177 | ||
178 | // PTY | |
179 | struct pakfire_jail_pty { | |
180 | // The path to the console | |
181 | char console[PATH_MAX]; | |
182 | ||
183 | // The master fd | |
184 | struct pakfire_jail_pty_master { | |
185 | int fd; | |
186 | ||
187 | enum pakfire_jail_pty_flags { | |
188 | PAKFIRE_JAIL_PTY_READY_TO_READ = (1 << 0), | |
189 | PAKFIRE_JAIL_PTY_READY_TO_WRITE = (1 << 1), | |
190 | } flags; | |
191 | } master; | |
192 | ||
193 | // Standard Input | |
194 | struct pakfire_jail_pty_stdio { | |
195 | int fd; | |
196 | struct pakfire_log_buffer buffer; | |
197 | struct termios attrs; | |
198 | int fdflags; | |
199 | enum pakfire_jail_pty_flags flags; | |
200 | } stdin; | |
201 | ||
202 | // Standard Output | |
203 | struct pakfire_jail_pty_stdio stdout; | |
204 | } pty; | |
205 | }; | |
206 | ||
207 | static int clone3(struct clone_args* args, size_t size) { | |
208 | return syscall(__NR_clone3, args, size); | |
209 | } | |
210 | ||
211 | static int pidfd_send_signal(int pidfd, int sig, siginfo_t* info, unsigned int flags) { | |
212 | return syscall(SYS_pidfd_send_signal, pidfd, sig, info, flags); | |
213 | } | |
214 | ||
215 | static int pivot_root(const char* new_root, const char* old_root) { | |
216 | return syscall(SYS_pivot_root, new_root, old_root); | |
217 | } | |
218 | ||
219 | static int pakfire_jail_exec_has_flag( | |
220 | const struct pakfire_jail_exec* ctx, const enum pakfire_jail_exec_flags flag) { | |
221 | return ctx->flags & flag; | |
222 | } | |
223 | ||
224 | static void pakfire_jail_free(struct pakfire_jail* jail) { | |
225 | DEBUG(jail->pakfire, "Freeing jail at %p\n", jail); | |
226 | ||
227 | // Free environment | |
228 | for (unsigned int i = 0; jail->env[i]; i++) | |
229 | free(jail->env[i]); | |
230 | ||
231 | if (jail->cgroup) | |
232 | pakfire_cgroup_unref(jail->cgroup); | |
233 | if (jail->pakfire) | |
234 | pakfire_unref(jail->pakfire); | |
235 | if (jail->ctx) | |
236 | pakfire_ctx_unref(jail->ctx); | |
237 | free(jail); | |
238 | } | |
239 | ||
240 | /* | |
241 | Passes any log messages on to the default pakfire log callback | |
242 | */ | |
243 | static int pakfire_jail_default_log_callback(struct pakfire* pakfire, void* data, | |
244 | int priority, const char* line, size_t length) { | |
245 | struct pakfire_ctx* ctx = pakfire_ctx(pakfire); | |
246 | ||
247 | if (pakfire_ctx_get_log_level(ctx) >= priority) | |
248 | pakfire_ctx_log(ctx, priority, NULL, 0, NULL, "%.*s", (int)length, line); | |
249 | ||
250 | pakfire_ctx_unref(ctx); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static const char* pakfire_jail_uuid(struct pakfire_jail* jail) { | |
256 | if (!*jail->__uuid) | |
257 | uuid_unparse_lower(jail->uuid, jail->__uuid); | |
258 | ||
259 | return jail->__uuid; | |
260 | } | |
261 | ||
262 | static int pakfire_jail_setup_interactive_env(struct pakfire_jail* jail) { | |
263 | // Set PS1 | |
264 | int r = pakfire_jail_set_env(jail, "PS1", "pakfire-jail \\w> "); | |
265 | if (r) | |
266 | return r; | |
267 | ||
268 | // Copy TERM | |
269 | char* TERM = secure_getenv("TERM"); | |
270 | if (TERM) { | |
271 | r = pakfire_jail_set_env(jail, "TERM", TERM); | |
272 | if (r) | |
273 | return r; | |
274 | } | |
275 | ||
276 | // Copy LANG | |
277 | char* LANG = secure_getenv("LANG"); | |
278 | if (LANG) { | |
279 | r = pakfire_jail_set_env(jail, "LANG", LANG); | |
280 | if (r) | |
281 | return r; | |
282 | } | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | PAKFIRE_EXPORT int pakfire_jail_create(struct pakfire_jail** jail, struct pakfire* pakfire) { | |
288 | int r; | |
289 | ||
290 | const char* arch = pakfire_get_effective_arch(pakfire); | |
291 | ||
292 | // Allocate a new jail | |
293 | struct pakfire_jail* j = calloc(1, sizeof(*j)); | |
294 | if (!j) | |
295 | return 1; | |
296 | ||
297 | // Reference context | |
298 | j->ctx = pakfire_ctx(pakfire); | |
299 | ||
300 | // Reference Pakfire | |
301 | j->pakfire = pakfire_ref(pakfire); | |
302 | ||
303 | // Initialize reference counter | |
304 | j->nrefs = 1; | |
305 | ||
306 | // Generate a random UUID | |
307 | uuid_generate_random(j->uuid); | |
308 | ||
309 | DEBUG(j->pakfire, "Allocated new jail at %p\n", j); | |
310 | ||
311 | // Set the default logging callback | |
312 | pakfire_jail_set_log_callback(j, pakfire_jail_default_log_callback, NULL); | |
313 | ||
314 | // Set default environment | |
315 | for (const struct environ* e = ENV; e->key; e++) { | |
316 | r = pakfire_jail_set_env(j, e->key, e->val); | |
317 | if (r) | |
318 | goto ERROR; | |
319 | } | |
320 | ||
321 | // Enable all CPU features that CPU has to offer | |
322 | if (!pakfire_arch_is_supported_by_host(arch)) { | |
323 | r = pakfire_jail_set_env(j, "QEMU_CPU", "max"); | |
324 | if (r) | |
325 | goto ERROR; | |
326 | } | |
327 | ||
328 | // Set container UUID | |
329 | r = pakfire_jail_set_env(j, "container_uuid", pakfire_jail_uuid(j)); | |
330 | if (r) | |
331 | goto ERROR; | |
332 | ||
333 | // Disable systemctl to talk to systemd | |
334 | if (!pakfire_on_root(j->pakfire)) { | |
335 | r = pakfire_jail_set_env(j, "SYSTEMD_OFFLINE", "1"); | |
336 | if (r) | |
337 | goto ERROR; | |
338 | } | |
339 | ||
340 | // Done | |
341 | *jail = j; | |
342 | return 0; | |
343 | ||
344 | ERROR: | |
345 | pakfire_jail_free(j); | |
346 | ||
347 | return r; | |
348 | } | |
349 | ||
350 | PAKFIRE_EXPORT struct pakfire_jail* pakfire_jail_ref(struct pakfire_jail* jail) { | |
351 | ++jail->nrefs; | |
352 | ||
353 | return jail; | |
354 | } | |
355 | ||
356 | PAKFIRE_EXPORT struct pakfire_jail* pakfire_jail_unref(struct pakfire_jail* jail) { | |
357 | if (--jail->nrefs > 0) | |
358 | return jail; | |
359 | ||
360 | pakfire_jail_free(jail); | |
361 | return NULL; | |
362 | } | |
363 | ||
364 | // Logging Callback | |
365 | ||
366 | PAKFIRE_EXPORT void pakfire_jail_set_log_callback(struct pakfire_jail* jail, | |
367 | pakfire_jail_log_callback callback, void* data) { | |
368 | jail->callbacks.log = callback; | |
369 | jail->callbacks.log_data = data; | |
370 | } | |
371 | ||
372 | // Resource Limits | |
373 | ||
374 | PAKFIRE_EXPORT int pakfire_jail_nice(struct pakfire_jail* jail, int nice) { | |
375 | // Check if nice level is in range | |
376 | if (nice < -19 || nice > 20) { | |
377 | errno = EINVAL; | |
378 | return 1; | |
379 | } | |
380 | ||
381 | // Store nice level | |
382 | jail->nice = nice; | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | int pakfire_jail_set_cgroup(struct pakfire_jail* jail, struct pakfire_cgroup* cgroup) { | |
388 | // Free any previous cgroup | |
389 | if (jail->cgroup) { | |
390 | pakfire_cgroup_unref(jail->cgroup); | |
391 | jail->cgroup = NULL; | |
392 | } | |
393 | ||
394 | // Set any new cgroup | |
395 | if (cgroup) { | |
396 | DEBUG(jail->pakfire, "Setting cgroup %p\n", cgroup); | |
397 | ||
398 | jail->cgroup = pakfire_cgroup_ref(cgroup); | |
399 | } | |
400 | ||
401 | // Done | |
402 | return 0; | |
403 | } | |
404 | ||
405 | // Environment | |
406 | ||
407 | // Returns the length of the environment | |
408 | static unsigned int pakfire_jail_env_length(struct pakfire_jail* jail) { | |
409 | unsigned int i = 0; | |
410 | ||
411 | // Count everything in the environment | |
412 | for (char** e = jail->env; *e; e++) | |
413 | i++; | |
414 | ||
415 | return i; | |
416 | } | |
417 | ||
418 | // Finds an existing environment variable and returns its index or -1 if not found | |
419 | static int pakfire_jail_find_env(struct pakfire_jail* jail, const char* key) { | |
420 | if (!key) { | |
421 | errno = EINVAL; | |
422 | return -1; | |
423 | } | |
424 | ||
425 | const size_t length = strlen(key); | |
426 | ||
427 | for (unsigned int i = 0; jail->env[i]; i++) { | |
428 | if ((pakfire_string_startswith(jail->env[i], key) | |
429 | && *(jail->env[i] + length) == '=')) { | |
430 | return i; | |
431 | } | |
432 | } | |
433 | ||
434 | // Nothing found | |
435 | return -1; | |
436 | } | |
437 | ||
438 | // Returns the value of an environment variable or NULL | |
439 | PAKFIRE_EXPORT const char* pakfire_jail_get_env(struct pakfire_jail* jail, | |
440 | const char* key) { | |
441 | int i = pakfire_jail_find_env(jail, key); | |
442 | if (i < 0) | |
443 | return NULL; | |
444 | ||
445 | return jail->env[i] + strlen(key) + 1; | |
446 | } | |
447 | ||
448 | // Sets an environment variable | |
449 | PAKFIRE_EXPORT int pakfire_jail_set_env(struct pakfire_jail* jail, | |
450 | const char* key, const char* value) { | |
451 | // Find the index where to write this value to | |
452 | int i = pakfire_jail_find_env(jail, key); | |
453 | if (i < 0) | |
454 | i = pakfire_jail_env_length(jail); | |
455 | ||
456 | // Return -ENOSPC when the environment is full | |
457 | if (i >= ENVIRON_SIZE) { | |
458 | errno = ENOSPC; | |
459 | return -1; | |
460 | } | |
461 | ||
462 | // Free any previous value | |
463 | if (jail->env[i]) | |
464 | free(jail->env[i]); | |
465 | ||
466 | // Format and set environment variable | |
467 | asprintf(&jail->env[i], "%s=%s", key, value); | |
468 | ||
469 | DEBUG(jail->pakfire, "Set environment variable: %s\n", jail->env[i]); | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | // Imports an environment | |
475 | PAKFIRE_EXPORT int pakfire_jail_import_env(struct pakfire_jail* jail, const char* env[]) { | |
476 | if (!env) | |
477 | return 0; | |
478 | ||
479 | char* key; | |
480 | char* val; | |
481 | int r; | |
482 | ||
483 | // Copy environment variables | |
484 | for (unsigned int i = 0; env[i]; i++) { | |
485 | r = pakfire_string_partition(env[i], "=", &key, &val); | |
486 | if (r) | |
487 | continue; | |
488 | ||
489 | // Set value | |
490 | r = pakfire_jail_set_env(jail, key, val); | |
491 | ||
492 | if (key) | |
493 | free(key); | |
494 | if (val) | |
495 | free(val); | |
496 | ||
497 | // Break on error | |
498 | if (r) | |
499 | return r; | |
500 | } | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
505 | // Timeout | |
506 | ||
507 | PAKFIRE_EXPORT int pakfire_jail_set_timeout( | |
508 | struct pakfire_jail* jail, unsigned int timeout) { | |
509 | // Store value | |
510 | jail->timeout.it_value.tv_sec = timeout; | |
511 | ||
512 | if (timeout > 0) | |
513 | DEBUG(jail->pakfire, "Timeout set to %u second(s)\n", timeout); | |
514 | else | |
515 | DEBUG(jail->pakfire, "Timeout disabled\n"); | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static int pakfire_jail_create_timer(struct pakfire_jail* jail) { | |
521 | int r; | |
522 | ||
523 | // Nothing to do if no timeout has been set | |
524 | if (!jail->timeout.it_value.tv_sec) | |
525 | return -1; | |
526 | ||
527 | // Create a new timer | |
528 | const int fd = timerfd_create(CLOCK_MONOTONIC, 0); | |
529 | if (fd < 0) { | |
530 | ERROR(jail->pakfire, "Could not create timer: %m\n"); | |
531 | goto ERROR; | |
532 | } | |
533 | ||
534 | // Arm timer | |
535 | r = timerfd_settime(fd, 0, &jail->timeout, NULL); | |
536 | if (r) { | |
537 | ERROR(jail->pakfire, "Could not arm timer: %m\n"); | |
538 | goto ERROR; | |
539 | } | |
540 | ||
541 | return fd; | |
542 | ||
543 | ERROR: | |
544 | if (fd >= 0) | |
545 | close(fd); | |
546 | ||
547 | return -1; | |
548 | } | |
549 | ||
550 | /* | |
551 | This function replaces any logging in the child process. | |
552 | ||
553 | All log messages will be sent to the parent process through their respective pipes. | |
554 | */ | |
555 | static void pakfire_jail_log_redirect(void* data, int priority, const char* file, | |
556 | int line, const char* fn, const char* format, va_list args) { | |
557 | struct pakfire_jail_pipes* pipes = (struct pakfire_jail_pipes*)data; | |
558 | int fd; | |
559 | ||
560 | switch (priority) { | |
561 | case LOG_INFO: | |
562 | fd = pipes->log_INFO[1]; | |
563 | break; | |
564 | ||
565 | case LOG_ERR: | |
566 | fd = pipes->log_ERROR[1]; | |
567 | break; | |
568 | ||
569 | #ifdef ENABLE_DEBUG | |
570 | case LOG_DEBUG: | |
571 | fd = pipes->log_DEBUG[1]; | |
572 | break; | |
573 | #endif /* ENABLE_DEBUG */ | |
574 | ||
575 | // Ignore any messages of an unknown priority | |
576 | default: | |
577 | return; | |
578 | } | |
579 | ||
580 | // End if we do not have a file descriptor to write to | |
581 | if (fd < 0) | |
582 | return; | |
583 | ||
584 | // Optionally log the function name | |
585 | if (fn) | |
586 | dprintf(fd, "%s: ", fn); | |
587 | ||
588 | // Send the log message | |
589 | vdprintf(fd, format, args); | |
590 | } | |
591 | ||
592 | static int pakfire_jail_log_buffer_is_full(const struct pakfire_log_buffer* buffer) { | |
593 | return (sizeof(buffer->data) == buffer->used); | |
594 | } | |
595 | ||
596 | static int pakfire_jail_fill_buffer(struct pakfire_jail* jail, int fd, struct pakfire_log_buffer* buffer) { | |
597 | int r; | |
598 | ||
599 | // Skip this if there is not space left in the buffer | |
600 | if (buffer->used >= sizeof(buffer->data)) | |
601 | return 0; | |
602 | ||
603 | // Fill the buffer | |
604 | r = read(fd, buffer->data + buffer->used, sizeof(buffer->data) - buffer->used); | |
605 | ||
606 | // Handle errors | |
607 | if (r < 0) { | |
608 | switch (errno) { | |
609 | case EAGAIN: | |
610 | case EIO: | |
611 | break; | |
612 | ||
613 | default: | |
614 | return -errno; | |
615 | } | |
616 | ||
617 | // EOF | |
618 | } else if (r == 0) { | |
619 | // XXX What to do here? | |
620 | ||
621 | // Successful read | |
622 | } else { | |
623 | buffer->used += r; | |
624 | } | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | static int pakfire_jail_drain_buffer_with_callback(struct pakfire_jail* jail, | |
630 | struct pakfire_log_buffer* buffer, int priority, pakfire_jail_communicate_out callback, void* data) { | |
631 | const char* eol = NULL; | |
632 | int r; | |
633 | ||
634 | while (buffer->used) { | |
635 | // Search for the end of the first line | |
636 | eol = memchr(buffer->data, '\n', buffer->used); | |
637 | ||
638 | // No newline found | |
639 | if (!eol) { | |
640 | // If the buffer is full, we send the entire content to make space. | |
641 | if (pakfire_jail_log_buffer_is_full(buffer)) { | |
642 | CTX_DEBUG(jail->ctx, "Buffer is full. Sending all content\n"); | |
643 | ||
644 | eol = buffer->data + buffer->used - 1; | |
645 | ||
646 | // Otherwise we might have only read parts of the output... | |
647 | } else { | |
648 | break; | |
649 | } | |
650 | } | |
651 | ||
652 | // Find the length of the string | |
653 | const size_t length = eol - buffer->data + 1; | |
654 | ||
655 | // Call the callback | |
656 | r = callback(jail->pakfire, data, priority, buffer->data, length); | |
657 | if (r) { | |
658 | CTX_ERROR(jail->ctx, "The logging callback returned an error: %d\n", r); | |
659 | return r; | |
660 | } | |
661 | ||
662 | // Remove line from buffer | |
663 | memmove(buffer->data, buffer->data + length, buffer->used - length); | |
664 | buffer->used -= length; | |
665 | } | |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
670 | static int pakfire_jail_drain_buffer(struct pakfire_jail* jail, int fd, struct pakfire_log_buffer* buffer) { | |
671 | int r; | |
672 | ||
673 | // Nothing to do if the buffer is empty | |
674 | if (!buffer->used) | |
675 | return 0; | |
676 | ||
677 | // Do not try to write to an invalid file descriptor | |
678 | if (fd < 0) | |
679 | return 0; | |
680 | ||
681 | // Drain the buffer | |
682 | r = write(fd, buffer->data, buffer->used); | |
683 | ||
684 | // Handle errors | |
685 | if (r < 0) { | |
686 | switch (errno) { | |
687 | case EAGAIN: | |
688 | case EIO: | |
689 | break; | |
690 | ||
691 | default: | |
692 | return -errno; | |
693 | } | |
694 | ||
695 | // Successful write | |
696 | } else { | |
697 | memmove(buffer->data, buffer->data + r, buffer->used - r); | |
698 | ||
699 | buffer->used -= r; | |
700 | } | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
705 | /* | |
706 | This function reads as much data as it can from the file descriptor. | |
707 | If it finds a whole line in it, it will send it to the logger and repeat the process. | |
708 | If not newline character is found, it will try to read more data until it finds one. | |
709 | */ | |
710 | static int pakfire_jail_handle_log(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx, | |
711 | int priority, int fd, struct pakfire_log_buffer* buffer, | |
712 | pakfire_jail_communicate_out callback, void* data) { | |
713 | int r; | |
714 | ||
715 | // Fill up buffer from fd | |
716 | r = pakfire_jail_fill_buffer(jail, fd, buffer); | |
717 | if (r) | |
718 | return r; | |
719 | ||
720 | // Drain the buffer | |
721 | r = pakfire_jail_drain_buffer_with_callback(jail, buffer, priority, callback, data); | |
722 | if (r) | |
723 | return r; | |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
728 | static int pakfire_jail_stream_stdin(struct pakfire_jail* jail, | |
729 | struct pakfire_jail_exec* ctx, const int fd) { | |
730 | const char eof = 0x04; | |
731 | int r; | |
732 | ||
733 | // Skip if the writing pipe has already been closed | |
734 | if (fd < 0) | |
735 | return 0; | |
736 | ||
737 | CTX_DEBUG(jail->ctx, "Streaming standard input...\n"); | |
738 | ||
739 | // Calling the callback | |
740 | r = ctx->communicate.in(jail->pakfire, ctx->communicate.data, fd); | |
741 | ||
742 | switch (r) { | |
743 | case EOF: | |
744 | // The callback signaled that it has written everything | |
745 | CTX_DEBUG(jail->ctx, "Closing standard input pipe\n"); | |
746 | ||
747 | // Send EOF (Ctrl-D) | |
748 | r = write(fd, &eof, sizeof(eof)); | |
749 | if (r < 0) { | |
750 | CTX_ERROR(jail->ctx, "Could not write EOF: %s\n", strerror(errno)); | |
751 | return -errno; | |
752 | } | |
753 | ||
754 | return 0; | |
755 | ||
756 | case 0: | |
757 | CTX_DEBUG(jail->ctx, "Standard input callback finished\n"); | |
758 | return 0; | |
759 | ||
760 | default: | |
761 | CTX_ERROR(jail->ctx, "Standard input callback failed: %s\n", strerror(-r)); | |
762 | return r; | |
763 | } | |
764 | } | |
765 | ||
766 | static int pakfire_jail_recv_fd(struct pakfire_jail* jail, int socket, int* fd) { | |
767 | const size_t payload_length = sizeof(fd); | |
768 | char buffer[CMSG_SPACE(payload_length)]; | |
769 | int r; | |
770 | ||
771 | struct msghdr msg = { | |
772 | .msg_control = buffer, | |
773 | .msg_controllen = sizeof(buffer), | |
774 | }; | |
775 | ||
776 | // Receive the message | |
777 | r = recvmsg(socket, &msg, 0); | |
778 | if (r) { | |
779 | CTX_ERROR(jail->ctx, "Could not receive file descriptor: %s\n", strerror(errno)); | |
780 | return -errno; | |
781 | } | |
782 | ||
783 | // Fetch the payload | |
784 | struct cmsghdr* cmsg = CMSG_FIRSTHDR(&msg); | |
785 | if (!cmsg) | |
786 | return -EBADMSG; | |
787 | ||
788 | *fd = *((int*)CMSG_DATA(cmsg)); | |
789 | ||
790 | CTX_DEBUG(jail->ctx, "Received fd %d from socket %d\n", *fd, socket); | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
795 | static int pakfire_jail_send_fd(struct pakfire_jail* jail, int socket, int fd) { | |
796 | const size_t payload_length = sizeof(fd); | |
797 | char buffer[CMSG_SPACE(payload_length)]; | |
798 | int r; | |
799 | ||
800 | CTX_DEBUG(jail->ctx, "Sending fd %d to socket %d\n", fd, socket); | |
801 | ||
802 | // Header | |
803 | struct msghdr msg = { | |
804 | .msg_control = buffer, | |
805 | .msg_controllen = sizeof(buffer), | |
806 | }; | |
807 | ||
808 | // Payload | |
809 | struct cmsghdr* cmsg = CMSG_FIRSTHDR(&msg); | |
810 | cmsg->cmsg_level = SOL_SOCKET; | |
811 | cmsg->cmsg_type = SCM_RIGHTS; | |
812 | cmsg->cmsg_len = CMSG_LEN(payload_length); | |
813 | ||
814 | // Set payload | |
815 | *((int*)CMSG_DATA(cmsg)) = fd; | |
816 | ||
817 | // Send the message | |
818 | r = sendmsg(socket, &msg, 0); | |
819 | if (r) { | |
820 | CTX_ERROR(jail->ctx, "Could not send file descriptor: %s\n", strerror(errno)); | |
821 | return -errno; | |
822 | } | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | static int pakfire_jail_setup_pipe(struct pakfire_jail* jail, int (*fds)[2], const int flags) { | |
828 | int r = pipe2(*fds, flags); | |
829 | if (r < 0) { | |
830 | ERROR(jail->pakfire, "Could not setup pipe: %m\n"); | |
831 | return 1; | |
832 | } | |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
837 | static void pakfire_jail_close_pipe(struct pakfire_jail* jail, int fds[2]) { | |
838 | for (unsigned int i = 0; i < 2; i++) | |
839 | if (fds[i] >= 0) | |
840 | close(fds[i]); | |
841 | } | |
842 | ||
843 | /* | |
844 | This is a convenience function to fetch the reading end of a pipe and | |
845 | closes the write end. | |
846 | */ | |
847 | static int pakfire_jail_get_pipe_to_read(struct pakfire_jail* jail, int (*fds)[2]) { | |
848 | // Give the variables easier names to avoid confusion | |
849 | int* fd_read = &(*fds)[0]; | |
850 | int* fd_write = &(*fds)[1]; | |
851 | ||
852 | // Close the write end of the pipe | |
853 | if (*fd_write >= 0) { | |
854 | close(*fd_write); | |
855 | *fd_write = -1; | |
856 | } | |
857 | ||
858 | // Return the read end | |
859 | if (*fd_read >= 0) | |
860 | return *fd_read; | |
861 | ||
862 | return -1; | |
863 | } | |
864 | ||
865 | static int pakfire_jail_get_pipe_to_write(struct pakfire_jail* jail, int (*fds)[2]) { | |
866 | // Give the variables easier names to avoid confusion | |
867 | int* fd_read = &(*fds)[0]; | |
868 | int* fd_write = &(*fds)[1]; | |
869 | ||
870 | // Close the read end of the pipe | |
871 | if (*fd_read >= 0) { | |
872 | close(*fd_read); | |
873 | *fd_read = -1; | |
874 | } | |
875 | ||
876 | // Return the write end | |
877 | if (*fd_write >= 0) | |
878 | return *fd_write; | |
879 | ||
880 | return -1; | |
881 | } | |
882 | ||
883 | static int pakfire_jail_epoll_add_fd(struct pakfire_jail* jail, int epollfd, int fd, int events) { | |
884 | struct epoll_event event = { | |
885 | .events = events|EPOLLHUP, | |
886 | .data = { | |
887 | .fd = fd, | |
888 | }, | |
889 | }; | |
890 | int r; | |
891 | ||
892 | // Read flags | |
893 | int flags = fcntl(fd, F_GETFL, 0); | |
894 | ||
895 | // Set modified flags | |
896 | r = fcntl(fd, F_SETFL, flags|O_NONBLOCK); | |
897 | if (r < 0) { | |
898 | CTX_ERROR(jail->ctx, "Could not set file descriptor %d into non-blocking mode: %s\n", | |
899 | fd, strerror(errno)); | |
900 | return -errno; | |
901 | } | |
902 | ||
903 | // Add the file descriptor to the loop | |
904 | r = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &event); | |
905 | if (r < 0) { | |
906 | ERROR(jail->pakfire, "Could not add file descriptor %d to epoll(): %s\n", | |
907 | fd, strerror(errno)); | |
908 | return -errno; | |
909 | } | |
910 | ||
911 | return 0; | |
912 | } | |
913 | ||
914 | // PTY Forwarding | |
915 | ||
916 | static int pakfire_jail_enable_raw_mode(struct pakfire_jail* jail, | |
917 | struct pakfire_jail_pty_stdio* stdio) { | |
918 | struct termios raw_attrs; | |
919 | int r; | |
920 | ||
921 | // Skip if we don't know the file descriptor | |
922 | if (stdio->fd < 0) | |
923 | return 0; | |
924 | ||
925 | // Skip everything if fd is not a TTY | |
926 | if (!isatty(stdio->fd)) | |
927 | return 0; | |
928 | ||
929 | // Store flags | |
930 | stdio->fdflags = fcntl(stdio->fd, F_GETFL); | |
931 | if (stdio->fdflags < 0) { | |
932 | CTX_ERROR(jail->ctx, "Could not fetch flags from fd %d: %s\n", | |
933 | stdio->fd, strerror(errno)); | |
934 | return -errno; | |
935 | } | |
936 | ||
937 | // Fetch all attributes | |
938 | r = tcgetattr(stdio->fd, &stdio->attrs); | |
939 | if (r) { | |
940 | CTX_ERROR(jail->ctx, "Could not fetch terminal attributes from fd %d: %s\n", | |
941 | stdio->fd, strerror(errno)); | |
942 | return -errno; | |
943 | } | |
944 | ||
945 | // Copy all attributes | |
946 | raw_attrs = stdio->attrs; | |
947 | ||
948 | // Make it RAW | |
949 | cfmakeraw(&raw_attrs); | |
950 | ||
951 | switch (stdio->fd) { | |
952 | case STDIN_FILENO: | |
953 | raw_attrs.c_oflag = stdio->attrs.c_oflag; | |
954 | break; | |
955 | ||
956 | case STDOUT_FILENO: | |
957 | raw_attrs.c_iflag = stdio->attrs.c_iflag; | |
958 | raw_attrs.c_lflag = stdio->attrs.c_lflag; | |
959 | break; | |
960 | } | |
961 | ||
962 | // Restore the attributes | |
963 | r = tcsetattr(stdio->fd, TCSANOW, &raw_attrs); | |
964 | if (r) { | |
965 | CTX_ERROR(jail->ctx, "Could not restore terminal attributes for fd %d: %s\n", | |
966 | stdio->fd, strerror(errno)); | |
967 | return -errno; | |
968 | } | |
969 | ||
970 | return 0; | |
971 | } | |
972 | ||
973 | static int pakfire_jail_restore_attrs(struct pakfire_jail* jail, | |
974 | const struct pakfire_jail_pty_stdio* stdio) { | |
975 | int r; | |
976 | ||
977 | // Skip if we don't know the file descriptor | |
978 | if (stdio->fd < 0) | |
979 | return 0; | |
980 | ||
981 | // Skip everything if fd is not a TTY | |
982 | if (!isatty(stdio->fd)) | |
983 | return 0; | |
984 | ||
985 | // Restore the flags | |
986 | r = fcntl(stdio->fd, F_SETFL, stdio->fdflags); | |
987 | if (r < 0) { | |
988 | CTX_ERROR(jail->ctx, "Could not set flags for file descriptor %d: %s\n", | |
989 | stdio->fd, strerror(errno)); | |
990 | return -errno; | |
991 | } | |
992 | ||
993 | // Restore the attributes | |
994 | r = tcsetattr(stdio->fd, TCSANOW, &stdio->attrs); | |
995 | if (r) { | |
996 | CTX_ERROR(jail->ctx, "Could not restore terminal attributes for %d, ignoring: %s\n", | |
997 | stdio->fd, strerror(errno)); | |
998 | return -errno; | |
999 | } | |
1000 | ||
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | static int pakfire_jail_setup_pty_forwarding(struct pakfire_jail* jail, | |
1005 | struct pakfire_jail_exec* ctx, const int epollfd, const int fd) { | |
1006 | struct winsize size; | |
1007 | int r; | |
1008 | ||
1009 | CTX_DEBUG(jail->ctx, "Setting up PTY forwarding on fd %d\n", fd); | |
1010 | ||
1011 | // Store the file descriptor | |
1012 | ctx->pty.master.fd = fd; | |
1013 | ||
1014 | // Add the master to the event loop | |
1015 | r = pakfire_jail_epoll_add_fd(jail, epollfd, ctx->pty.master.fd, EPOLLIN|EPOLLOUT|EPOLLET); | |
1016 | if (r) | |
1017 | return r; | |
1018 | ||
1019 | if (ctx->flags & PAKFIRE_JAIL_PTY_FORWARDING) { | |
1020 | // Configure stdin/stdout | |
1021 | ctx->pty.stdin.fd = STDIN_FILENO; | |
1022 | ctx->pty.stdout.fd = STDOUT_FILENO; | |
1023 | ||
1024 | // Fetch dimensions | |
1025 | if (isatty(ctx->pty.stdout.fd)) { | |
1026 | r = ioctl(ctx->pty.stdout.fd, TIOCGWINSZ, &size); | |
1027 | if (r) { | |
1028 | CTX_ERROR(jail->ctx, "Failed to determine terminal dimensions: %s\n", strerror(errno)); | |
1029 | return -errno; | |
1030 | } | |
1031 | ||
1032 | // Set dimensions | |
1033 | r = ioctl(ctx->pty.master.fd, TIOCSWINSZ, &size); | |
1034 | if (r) { | |
1035 | CTX_ERROR(jail->ctx, "Failed setting dimensions: %s\n", strerror(errno)); | |
1036 | return -errno; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | // Enable RAW mode on standard input | |
1041 | r = pakfire_jail_enable_raw_mode(jail, &ctx->pty.stdin); | |
1042 | if (r) | |
1043 | return r; | |
1044 | ||
1045 | // Enable RAW mode on standard output | |
1046 | r = pakfire_jail_enable_raw_mode(jail, &ctx->pty.stdout); | |
1047 | if (r) | |
1048 | return r; | |
1049 | ||
1050 | // Add standard input to the event loop | |
1051 | r = pakfire_jail_epoll_add_fd(jail, epollfd, ctx->pty.stdin.fd, EPOLLIN|EPOLLET); | |
1052 | if (r) | |
1053 | return r; | |
1054 | ||
1055 | // Add standard output to the event loop | |
1056 | r = pakfire_jail_epoll_add_fd(jail, epollfd, ctx->pty.stdout.fd, EPOLLOUT|EPOLLET); | |
1057 | if (r) | |
1058 | return r; | |
1059 | } | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static int pakfire_jail_forward_pty(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx) { | |
1065 | int r; | |
1066 | ||
1067 | while (ctx->pty.master.flags || ctx->pty.stdin.flags || ctx->pty.stdout.flags) { | |
1068 | // Read from standard input | |
1069 | if (ctx->pty.stdin.flags & PAKFIRE_JAIL_PTY_READY_TO_READ) { | |
1070 | r = pakfire_jail_fill_buffer(jail, ctx->pty.stdin.fd, &ctx->pty.stdin.buffer); | |
1071 | if (r) { | |
1072 | CTX_ERROR(jail->ctx, "Failed reading from standard input: %s\n", strerror(-r)); | |
1073 | return r; | |
1074 | } | |
1075 | ||
1076 | // We are done reading for now | |
1077 | ctx->pty.stdin.flags &= ~PAKFIRE_JAIL_PTY_READY_TO_READ; | |
1078 | ||
1079 | // But we may have data to write | |
1080 | if (ctx->pty.stdin.buffer.used) | |
1081 | ctx->pty.master.flags |= PAKFIRE_JAIL_PTY_READY_TO_WRITE; | |
1082 | } | |
1083 | ||
1084 | // Write to the master | |
1085 | if (ctx->pty.master.flags & PAKFIRE_JAIL_PTY_READY_TO_WRITE) { | |
1086 | if (ctx->communicate.in) { | |
1087 | r = pakfire_jail_stream_stdin(jail, ctx, ctx->pty.master.fd); | |
1088 | if (r) | |
1089 | return r; | |
1090 | ||
1091 | } else { | |
1092 | r = pakfire_jail_drain_buffer(jail, ctx->pty.master.fd, &ctx->pty.stdin.buffer); | |
1093 | if (r) { | |
1094 | CTX_ERROR(jail->ctx, "Failed writing to the PTY: %s\n", strerror(-r)); | |
1095 | return r; | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | // We are done writing for now | |
1100 | ctx->pty.master.flags &= ~PAKFIRE_JAIL_PTY_READY_TO_WRITE; | |
1101 | } | |
1102 | ||
1103 | // Read from the master | |
1104 | if (ctx->pty.master.flags & PAKFIRE_JAIL_PTY_READY_TO_READ) { | |
1105 | r = pakfire_jail_fill_buffer(jail, ctx->pty.master.fd, &ctx->pty.stdout.buffer); | |
1106 | if (r) { | |
1107 | CTX_ERROR(jail->ctx, "Failed reading from the PTY: %s\n", strerror(-r)); | |
1108 | return r; | |
1109 | } | |
1110 | ||
1111 | // We are done reading for now | |
1112 | ctx->pty.master.flags &= ~PAKFIRE_JAIL_PTY_READY_TO_READ; | |
1113 | ||
1114 | // But we may have data to write | |
1115 | if (ctx->pty.stdout.buffer.used) | |
1116 | ctx->pty.stdout.flags |= PAKFIRE_JAIL_PTY_READY_TO_WRITE; | |
1117 | } | |
1118 | ||
1119 | // Write to standard output | |
1120 | if (ctx->pty.stdout.flags & PAKFIRE_JAIL_PTY_READY_TO_WRITE) { | |
1121 | // If we have a callback, we will send any output to the callback | |
1122 | if (ctx->communicate.out) { | |
1123 | r = pakfire_jail_drain_buffer_with_callback(jail, &ctx->pty.stdout.buffer, | |
1124 | LOG_INFO, ctx->communicate.out, ctx->communicate.data); | |
1125 | if (r) | |
1126 | return r; | |
1127 | ||
1128 | // If we have a file descriptor, we will forward any output | |
1129 | } else if (ctx->pty.stdout.fd >= 0) { | |
1130 | r = pakfire_jail_drain_buffer(jail, ctx->pty.stdout.fd, &ctx->pty.stdout.buffer); | |
1131 | if (r) { | |
1132 | CTX_ERROR(jail->ctx, "Failed writing to standard output: %s\n", strerror(-r)); | |
1133 | return r; | |
1134 | } | |
1135 | ||
1136 | // Otherwise send the output to the default logger | |
1137 | } else { | |
1138 | r = pakfire_jail_drain_buffer_with_callback(jail, &ctx->pty.stdout.buffer, | |
1139 | LOG_INFO, pakfire_jail_default_log_callback, NULL); | |
1140 | if (r) | |
1141 | return r; | |
1142 | } | |
1143 | ||
1144 | // We are done writing for now | |
1145 | ctx->pty.stdout.flags &= ~PAKFIRE_JAIL_PTY_READY_TO_WRITE; | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | static int pakfire_jail_wait(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx) { | |
1153 | int epollfd = -1; | |
1154 | struct epoll_event events[EPOLL_MAX_EVENTS]; | |
1155 | char garbage[8]; | |
1156 | int r = 0; | |
1157 | ||
1158 | // Fetch file descriptors from context | |
1159 | const int pidfd = ctx->pidfd; | |
1160 | ||
1161 | // Fetch the UNIX domain socket | |
1162 | const int socket_recv = pakfire_jail_get_pipe_to_read(jail, &ctx->socket); | |
1163 | ||
1164 | // Timer | |
1165 | const int timerfd = pakfire_jail_create_timer(jail); | |
1166 | ||
1167 | // Logging | |
1168 | const int log_INFO = pakfire_jail_get_pipe_to_read(jail, &ctx->pipes.log_INFO); | |
1169 | const int log_ERROR = pakfire_jail_get_pipe_to_read(jail, &ctx->pipes.log_ERROR); | |
1170 | #ifdef ENABLE_DEBUG | |
1171 | const int log_DEBUG = pakfire_jail_get_pipe_to_read(jail, &ctx->pipes.log_DEBUG); | |
1172 | #endif /* ENABLE_DEBUG */ | |
1173 | ||
1174 | // Make a list of all file descriptors we are interested in | |
1175 | const struct pakfire_wait_fds { | |
1176 | const int fd; | |
1177 | const int events; | |
1178 | } fds[] = { | |
1179 | // Timer | |
1180 | { timerfd, EPOLLIN }, | |
1181 | ||
1182 | // Child Process | |
1183 | { ctx->pidfd, EPOLLIN }, | |
1184 | ||
1185 | // Log Pipes | |
1186 | { log_INFO, EPOLLIN }, | |
1187 | { log_ERROR, EPOLLIN }, | |
1188 | #ifdef ENABLE_DEBUG | |
1189 | { log_DEBUG, EPOLLIN }, | |
1190 | #endif /* ENABLE_DEBUG */ | |
1191 | ||
1192 | // UNIX Domain Socket | |
1193 | { socket_recv, EPOLLIN }, | |
1194 | ||
1195 | // Sentinel | |
1196 | { -1, 0 }, | |
1197 | }; | |
1198 | ||
1199 | // Setup epoll | |
1200 | epollfd = epoll_create1(0); | |
1201 | if (epollfd < 0) { | |
1202 | ERROR(jail->pakfire, "Could not initialize epoll(): %m\n"); | |
1203 | r = 1; | |
1204 | goto ERROR; | |
1205 | } | |
1206 | ||
1207 | // Turn file descriptors into non-blocking mode and add them to epoll() | |
1208 | for (const struct pakfire_wait_fds* fd = fds; fd->events; fd++) { | |
1209 | // Skip fds which were not initialized | |
1210 | if (fd->fd < 0) | |
1211 | continue; | |
1212 | ||
1213 | // Add the FD to the event loop | |
1214 | r = pakfire_jail_epoll_add_fd(jail, epollfd, fd->fd, fd->events); | |
1215 | if (r) | |
1216 | goto ERROR; | |
1217 | } | |
1218 | ||
1219 | int ended = 0; | |
1220 | ||
1221 | // Loop for as long as the process is alive | |
1222 | while (!ended) { | |
1223 | int num = epoll_wait(epollfd, events, EPOLL_MAX_EVENTS, -1); | |
1224 | if (num < 1) { | |
1225 | // Ignore if epoll_wait() has been interrupted | |
1226 | if (errno == EINTR) | |
1227 | continue; | |
1228 | ||
1229 | ERROR(jail->pakfire, "epoll_wait() failed: %m\n"); | |
1230 | r = 1; | |
1231 | ||
1232 | goto ERROR; | |
1233 | } | |
1234 | ||
1235 | for (int i = 0; i < num; i++) { | |
1236 | int e = events[i].events; | |
1237 | int fd = events[i].data.fd; | |
1238 | ||
1239 | // Handle PTY forwarding events | |
1240 | if (ctx->pty.master.fd == fd) { | |
1241 | if (e & (EPOLLIN|EPOLLHUP)) | |
1242 | ctx->pty.master.flags |= PAKFIRE_JAIL_PTY_READY_TO_READ; | |
1243 | ||
1244 | if (e & (EPOLLOUT|EPOLLHUP)) | |
1245 | ctx->pty.master.flags |= PAKFIRE_JAIL_PTY_READY_TO_WRITE; | |
1246 | ||
1247 | // Perform the work | |
1248 | r = pakfire_jail_forward_pty(jail, ctx); | |
1249 | if (r) { | |
1250 | CTX_ERROR(jail->ctx, "Failed forwarding the PTY: %s\n", strerror(-r)); | |
1251 | goto ERROR; | |
1252 | } | |
1253 | ||
1254 | // Handle standard input | |
1255 | } else if (ctx->pty.stdin.fd == fd) { | |
1256 | if (e & (EPOLLIN|EPOLLHUP)) | |
1257 | ctx->pty.stdin.flags |= PAKFIRE_JAIL_PTY_READY_TO_READ; | |
1258 | ||
1259 | // Perform the work | |
1260 | r = pakfire_jail_forward_pty(jail, ctx); | |
1261 | if (r) { | |
1262 | CTX_ERROR(jail->ctx, "Failed forwarding the PTY: %s\n", strerror(-r)); | |
1263 | goto ERROR; | |
1264 | } | |
1265 | ||
1266 | // Handle standard output | |
1267 | } else if (ctx->pty.stdout.fd == fd) { | |
1268 | if (e & (EPOLLOUT|EPOLLHUP)) | |
1269 | ctx->pty.stdout.flags |= PAKFIRE_JAIL_PTY_READY_TO_WRITE; | |
1270 | ||
1271 | // Perform the work | |
1272 | r = pakfire_jail_forward_pty(jail, ctx); | |
1273 | if (r) { | |
1274 | CTX_ERROR(jail->ctx, "Failed forwarding the PTY: %s\n", strerror(-r)); | |
1275 | goto ERROR; | |
1276 | } | |
1277 | ||
1278 | // Handle any changes to the PIDFD | |
1279 | } else if (pidfd == fd) { | |
1280 | if (e & EPOLLIN) { | |
1281 | // Call waidid() and store the result | |
1282 | r = waitid(P_PIDFD, ctx->pidfd, &ctx->status, WEXITED); | |
1283 | if (r) { | |
1284 | ERROR(jail->pakfire, "waitid() failed: %m\n"); | |
1285 | goto ERROR; | |
1286 | } | |
1287 | ||
1288 | // Mark that we have ended so that we will process the remaining | |
1289 | // events from epoll() now, but won't restart the outer loop. | |
1290 | ended = 1; | |
1291 | } | |
1292 | ||
1293 | // Handle timer events | |
1294 | } else if (timerfd == fd) { | |
1295 | if (e & EPOLLIN) { | |
1296 | DEBUG(jail->pakfire, "Timer event received\n"); | |
1297 | ||
1298 | // Disarm the timer | |
1299 | r = read(timerfd, garbage, sizeof(garbage)); | |
1300 | if (r < 1) { | |
1301 | ERROR(jail->pakfire, "Could not disarm timer: %m\n"); | |
1302 | r = 1; | |
1303 | goto ERROR; | |
1304 | } | |
1305 | ||
1306 | // Terminate the process if it hasn't already ended | |
1307 | if (!ended) { | |
1308 | DEBUG(jail->pakfire, "Terminating process...\n"); | |
1309 | ||
1310 | // Send SIGTERM to the process | |
1311 | r = pidfd_send_signal(pidfd, SIGKILL, NULL, 0); | |
1312 | if (r) { | |
1313 | ERROR(jail->pakfire, "Could not kill process: %m\n"); | |
1314 | goto ERROR; | |
1315 | } | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | // Handle socket messages | |
1320 | } else if (socket_recv == fd) { | |
1321 | if (e & EPOLLIN) { | |
1322 | // Receive the passed FD | |
1323 | r = pakfire_jail_recv_fd(jail, socket_recv, &fd); | |
1324 | if (r) | |
1325 | goto ERROR; | |
1326 | ||
1327 | // Setup PTY forwarding | |
1328 | if (ctx->pty.master.fd < 0) { | |
1329 | r = pakfire_jail_setup_pty_forwarding(jail, ctx, epollfd, fd); | |
1330 | if (r) { | |
1331 | CTX_ERROR(jail->ctx, "Failed setting up PTY forwarding: %s\n", strerror(-r)); | |
1332 | goto ERROR; | |
1333 | } | |
1334 | } | |
1335 | } | |
1336 | ||
1337 | // Handle log INFO messages | |
1338 | } else if (log_INFO == fd) { | |
1339 | if (e & EPOLLIN) { | |
1340 | r = pakfire_jail_handle_log(jail, ctx, LOG_INFO, fd, | |
1341 | &ctx->buffers.log_INFO, pakfire_jail_default_log_callback, NULL); | |
1342 | if (r) | |
1343 | goto ERROR; | |
1344 | } | |
1345 | ||
1346 | // Handle log ERROR messages | |
1347 | } else if (log_ERROR == fd) { | |
1348 | if (e & EPOLLIN) { | |
1349 | r = pakfire_jail_handle_log(jail, ctx, LOG_ERR, fd, | |
1350 | &ctx->buffers.log_ERROR, pakfire_jail_default_log_callback, NULL); | |
1351 | if (r) | |
1352 | goto ERROR; | |
1353 | } | |
1354 | ||
1355 | #ifdef ENABLE_DEBUG | |
1356 | // Handle log DEBUG messages | |
1357 | } else if (log_DEBUG == fd) { | |
1358 | if (e & EPOLLIN) { | |
1359 | r = pakfire_jail_handle_log(jail, ctx, LOG_DEBUG, fd, | |
1360 | &ctx->buffers.log_DEBUG, pakfire_jail_default_log_callback, NULL); | |
1361 | if (r) | |
1362 | goto ERROR; | |
1363 | } | |
1364 | #endif /* ENABLE_DEBUG */ | |
1365 | ||
1366 | // Log a message for anything else | |
1367 | } else { | |
1368 | DEBUG(jail->pakfire, "Received invalid file descriptor %d\n", fd); | |
1369 | continue; | |
1370 | } | |
1371 | ||
1372 | // Check if any file descriptors have been closed | |
1373 | if (e & EPOLLHUP) { | |
1374 | // Remove the file descriptor | |
1375 | r = epoll_ctl(epollfd, EPOLL_CTL_DEL, fd, NULL); | |
1376 | if (r) { | |
1377 | ERROR(jail->pakfire, "Could not remove closed file-descriptor %d: %m\n", fd); | |
1378 | goto ERROR; | |
1379 | } | |
1380 | } | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | ERROR: | |
1385 | if (epollfd >= 0) | |
1386 | close(epollfd); | |
1387 | if (timerfd >= 0) | |
1388 | close(timerfd); | |
1389 | ||
1390 | // Restore any changed terminal attributes | |
1391 | if (ctx->pty.stdin.fd >= 0) | |
1392 | pakfire_jail_restore_attrs(jail, &ctx->pty.stdin); | |
1393 | if (ctx->pty.stdout.fd >= 0) | |
1394 | pakfire_jail_restore_attrs(jail, &ctx->pty.stdout); | |
1395 | ||
1396 | return r; | |
1397 | } | |
1398 | ||
1399 | int pakfire_jail_capture_stdout(struct pakfire* pakfire, void* data, | |
1400 | int priority, const char* line, size_t length) { | |
1401 | char** output = (char**)data; | |
1402 | int r; | |
1403 | ||
1404 | // Append everything from stdout to a buffer | |
1405 | if (output && priority == LOG_INFO) { | |
1406 | r = asprintf(output, "%s%.*s", (output && *output) ? *output : "", (int)length, line); | |
1407 | if (r < 0) | |
1408 | return -errno; | |
1409 | ||
1410 | return 0; | |
1411 | } | |
1412 | ||
1413 | // Send everything else to the default logger | |
1414 | return pakfire_jail_default_log_callback(pakfire, NULL, priority, line, length); | |
1415 | } | |
1416 | ||
1417 | // Capabilities | |
1418 | ||
1419 | // Logs all capabilities of the current process | |
1420 | static int pakfire_jail_show_capabilities(struct pakfire_jail* jail) { | |
1421 | cap_t caps = NULL; | |
1422 | char* name = NULL; | |
1423 | cap_flag_value_t value_e; | |
1424 | cap_flag_value_t value_i; | |
1425 | cap_flag_value_t value_p; | |
1426 | int r; | |
1427 | ||
1428 | // Fetch PID | |
1429 | pid_t pid = getpid(); | |
1430 | ||
1431 | // Fetch all capabilities | |
1432 | caps = cap_get_proc(); | |
1433 | if (!caps) { | |
1434 | ERROR(jail->pakfire, "Could not fetch capabilities: %m\n"); | |
1435 | r = 1; | |
1436 | goto ERROR; | |
1437 | } | |
1438 | ||
1439 | DEBUG(jail->pakfire, "Capabilities of PID %d:\n", pid); | |
1440 | ||
1441 | // Iterate over all capabilities | |
1442 | for (unsigned int cap = 0; cap_valid(cap); cap++) { | |
1443 | name = cap_to_name(cap); | |
1444 | ||
1445 | // Fetch effective value | |
1446 | r = cap_get_flag(caps, cap, CAP_EFFECTIVE, &value_e); | |
1447 | if (r) | |
1448 | goto ERROR; | |
1449 | ||
1450 | // Fetch inheritable value | |
1451 | r = cap_get_flag(caps, cap, CAP_INHERITABLE, &value_i); | |
1452 | if (r) | |
1453 | goto ERROR; | |
1454 | ||
1455 | // Fetch permitted value | |
1456 | r = cap_get_flag(caps, cap, CAP_PERMITTED, &value_p); | |
1457 | if (r) | |
1458 | goto ERROR; | |
1459 | ||
1460 | DEBUG(jail->pakfire, | |
1461 | " %-24s : %c%c%c\n", | |
1462 | name, | |
1463 | (value_e == CAP_SET) ? 'e' : '-', | |
1464 | (value_i == CAP_SET) ? 'i' : '-', | |
1465 | (value_p == CAP_SET) ? 'p' : '-' | |
1466 | ); | |
1467 | ||
1468 | // Free name | |
1469 | cap_free(name); | |
1470 | name = NULL; | |
1471 | } | |
1472 | ||
1473 | // Success | |
1474 | r = 0; | |
1475 | ||
1476 | ERROR: | |
1477 | if (name) | |
1478 | cap_free(name); | |
1479 | if (caps) | |
1480 | cap_free(caps); | |
1481 | ||
1482 | return r; | |
1483 | } | |
1484 | ||
1485 | static int pakfire_jail_set_capabilities(struct pakfire_jail* jail) { | |
1486 | cap_t caps = NULL; | |
1487 | char* name = NULL; | |
1488 | int r; | |
1489 | ||
1490 | // Fetch capabilities | |
1491 | caps = cap_get_proc(); | |
1492 | if (!caps) { | |
1493 | ERROR(jail->pakfire, "Could not read capabilities: %m\n"); | |
1494 | r = 1; | |
1495 | goto ERROR; | |
1496 | } | |
1497 | ||
1498 | // Walk through all capabilities | |
1499 | for (cap_value_t cap = 0; cap_valid(cap); cap++) { | |
1500 | cap_value_t _caps[] = { cap }; | |
1501 | ||
1502 | // Fetch the name of the capability | |
1503 | name = cap_to_name(cap); | |
1504 | ||
1505 | r = cap_set_flag(caps, CAP_EFFECTIVE, 1, _caps, CAP_SET); | |
1506 | if (r) { | |
1507 | ERROR(jail->pakfire, "Could not set %s: %m\n", name); | |
1508 | goto ERROR; | |
1509 | } | |
1510 | ||
1511 | r = cap_set_flag(caps, CAP_INHERITABLE, 1, _caps, CAP_SET); | |
1512 | if (r) { | |
1513 | ERROR(jail->pakfire, "Could not set %s: %m\n", name); | |
1514 | goto ERROR; | |
1515 | } | |
1516 | ||
1517 | r = cap_set_flag(caps, CAP_PERMITTED, 1, _caps, CAP_SET); | |
1518 | if (r) { | |
1519 | ERROR(jail->pakfire, "Could not set %s: %m\n", name); | |
1520 | goto ERROR; | |
1521 | } | |
1522 | ||
1523 | // Free name | |
1524 | cap_free(name); | |
1525 | name = NULL; | |
1526 | } | |
1527 | ||
1528 | // Restore all capabilities | |
1529 | r = cap_set_proc(caps); | |
1530 | if (r) { | |
1531 | ERROR(jail->pakfire, "Restoring capabilities failed: %m\n"); | |
1532 | goto ERROR; | |
1533 | } | |
1534 | ||
1535 | // Add all capabilities to the ambient set | |
1536 | for (unsigned int cap = 0; cap_valid(cap); cap++) { | |
1537 | name = cap_to_name(cap); | |
1538 | ||
1539 | // Raise the capability | |
1540 | r = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, cap, 0, 0); | |
1541 | if (r) { | |
1542 | ERROR(jail->pakfire, "Could not set ambient capability %s: %m\n", name); | |
1543 | goto ERROR; | |
1544 | } | |
1545 | ||
1546 | // Free name | |
1547 | cap_free(name); | |
1548 | name = NULL; | |
1549 | } | |
1550 | ||
1551 | // Success | |
1552 | r = 0; | |
1553 | ||
1554 | ERROR: | |
1555 | if (name) | |
1556 | cap_free(name); | |
1557 | if (caps) | |
1558 | cap_free(caps); | |
1559 | ||
1560 | return r; | |
1561 | } | |
1562 | ||
1563 | // Syscall Filter | |
1564 | ||
1565 | static int pakfire_jail_limit_syscalls(struct pakfire_jail* jail) { | |
1566 | const int syscalls[] = { | |
1567 | // The kernel's keyring isn't namespaced | |
1568 | SCMP_SYS(keyctl), | |
1569 | SCMP_SYS(add_key), | |
1570 | SCMP_SYS(request_key), | |
1571 | ||
1572 | // Disable userfaultfd | |
1573 | SCMP_SYS(userfaultfd), | |
1574 | ||
1575 | // Disable perf which could leak a lot of information about the host | |
1576 | SCMP_SYS(perf_event_open), | |
1577 | ||
1578 | 0, | |
1579 | }; | |
1580 | int r = 1; | |
1581 | ||
1582 | DEBUG(jail->pakfire, "Applying syscall filter...\n"); | |
1583 | ||
1584 | // Setup a syscall filter which allows everything by default | |
1585 | scmp_filter_ctx ctx = seccomp_init(SCMP_ACT_ALLOW); | |
1586 | if (!ctx) { | |
1587 | ERROR(jail->pakfire, "Could not setup seccomp filter: %m\n"); | |
1588 | goto ERROR; | |
1589 | } | |
1590 | ||
1591 | // All all syscalls | |
1592 | for (const int* syscall = syscalls; *syscall; syscall++) { | |
1593 | r = seccomp_rule_add(ctx, SCMP_ACT_ERRNO(EPERM), *syscall, 0); | |
1594 | if (r) { | |
1595 | ERROR(jail->pakfire, "Could not configure syscall %d: %m\n", *syscall); | |
1596 | goto ERROR; | |
1597 | } | |
1598 | } | |
1599 | ||
1600 | // Load syscall filter into the kernel | |
1601 | r = seccomp_load(ctx); | |
1602 | if (r) { | |
1603 | ERROR(jail->pakfire, "Could not load syscall filter into the kernel: %m\n"); | |
1604 | goto ERROR; | |
1605 | } | |
1606 | ||
1607 | ERROR: | |
1608 | if (ctx) | |
1609 | seccomp_release(ctx); | |
1610 | ||
1611 | return r; | |
1612 | } | |
1613 | ||
1614 | // Mountpoints | |
1615 | ||
1616 | PAKFIRE_EXPORT int pakfire_jail_bind(struct pakfire_jail* jail, | |
1617 | const char* source, const char* target, int flags) { | |
1618 | struct pakfire_jail_mountpoint* mp = NULL; | |
1619 | int r; | |
1620 | ||
1621 | // Check if there is any space left | |
1622 | if (jail->num_mountpoints >= MAX_MOUNTPOINTS) { | |
1623 | errno = ENOSPC; | |
1624 | return 1; | |
1625 | } | |
1626 | ||
1627 | // Check for valid inputs | |
1628 | if (!source || !target) { | |
1629 | errno = EINVAL; | |
1630 | return 1; | |
1631 | } | |
1632 | ||
1633 | // Select the next free slot | |
1634 | mp = &jail->mountpoints[jail->num_mountpoints]; | |
1635 | ||
1636 | // Copy source | |
1637 | r = pakfire_string_set(mp->source, source); | |
1638 | if (r) { | |
1639 | ERROR(jail->pakfire, "Could not copy source: %m\n"); | |
1640 | return r; | |
1641 | } | |
1642 | ||
1643 | // Copy target | |
1644 | r = pakfire_string_set(mp->target, target); | |
1645 | if (r) { | |
1646 | ERROR(jail->pakfire, "Could not copy target: %m\n"); | |
1647 | return r; | |
1648 | } | |
1649 | ||
1650 | // Copy flags | |
1651 | mp->flags = flags; | |
1652 | ||
1653 | // Increment counter | |
1654 | jail->num_mountpoints++; | |
1655 | ||
1656 | return 0; | |
1657 | } | |
1658 | ||
1659 | static int pakfire_jail_mount_networking(struct pakfire_jail* jail) { | |
1660 | int r; | |
1661 | ||
1662 | const char* paths[] = { | |
1663 | "/etc/hosts", | |
1664 | "/etc/resolv.conf", | |
1665 | NULL, | |
1666 | }; | |
1667 | ||
1668 | // Bind-mount all paths read-only | |
1669 | for (const char** path = paths; *path; path++) { | |
1670 | r = pakfire_bind(jail->pakfire, *path, NULL, MS_RDONLY); | |
1671 | if (r) { | |
1672 | switch (errno) { | |
1673 | // Ignore if we don't have permission | |
1674 | case EPERM: | |
1675 | continue; | |
1676 | ||
1677 | default: | |
1678 | break; | |
1679 | } | |
1680 | return r; | |
1681 | } | |
1682 | } | |
1683 | ||
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | /* | |
1688 | Mounts everything that we require in the new namespace | |
1689 | */ | |
1690 | static int pakfire_jail_mount(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx) { | |
1691 | struct pakfire_jail_mountpoint* mp = NULL; | |
1692 | int flags = 0; | |
1693 | int r; | |
1694 | ||
1695 | // Enable loop devices | |
1696 | if (pakfire_jail_exec_has_flag(ctx, PAKFIRE_JAIL_HAS_LOOP_DEVICES)) | |
1697 | flags |= PAKFIRE_MOUNT_LOOP_DEVICES; | |
1698 | ||
1699 | // Mount all default stuff | |
1700 | r = pakfire_mount_all(jail->pakfire, PAKFIRE_MNTNS_OUTER, flags); | |
1701 | if (r) | |
1702 | return r; | |
1703 | ||
1704 | // Populate /dev | |
1705 | r = pakfire_populate_dev(jail->pakfire, flags); | |
1706 | if (r) | |
1707 | return r; | |
1708 | ||
1709 | // Mount the interpreter (if needed) | |
1710 | r = pakfire_mount_interpreter(jail->pakfire); | |
1711 | if (r) | |
1712 | return r; | |
1713 | ||
1714 | // Mount networking stuff | |
1715 | if (pakfire_jail_exec_has_flag(ctx, PAKFIRE_JAIL_HAS_NETWORKING)) { | |
1716 | r = pakfire_jail_mount_networking(jail); | |
1717 | if (r) | |
1718 | return r; | |
1719 | } | |
1720 | ||
1721 | // Mount all custom stuff | |
1722 | for (unsigned int i = 0; i < jail->num_mountpoints; i++) { | |
1723 | // Fetch mountpoint | |
1724 | mp = &jail->mountpoints[i]; | |
1725 | ||
1726 | // Mount it | |
1727 | r = pakfire_bind(jail->pakfire, mp->source, mp->target, mp->flags); | |
1728 | if (r) | |
1729 | return r; | |
1730 | } | |
1731 | ||
1732 | return 0; | |
1733 | } | |
1734 | ||
1735 | // Networking | |
1736 | ||
1737 | static int pakfire_jail_setup_loopback(struct pakfire_jail* jail) { | |
1738 | struct nl_sock* nl = NULL; | |
1739 | struct nl_cache* cache = NULL; | |
1740 | struct rtnl_link* link = NULL; | |
1741 | struct rtnl_link* change = NULL; | |
1742 | int r; | |
1743 | ||
1744 | DEBUG(jail->pakfire, "Setting up loopback...\n"); | |
1745 | ||
1746 | // Allocate a netlink socket | |
1747 | nl = nl_socket_alloc(); | |
1748 | if (!nl) { | |
1749 | ERROR(jail->pakfire, "Could not allocate a netlink socket: %m\n"); | |
1750 | r = 1; | |
1751 | goto ERROR; | |
1752 | } | |
1753 | ||
1754 | // Connect the socket | |
1755 | r = nl_connect(nl, NETLINK_ROUTE); | |
1756 | if (r) { | |
1757 | ERROR(jail->pakfire, "Could not connect netlink socket: %s\n", nl_geterror(r)); | |
1758 | goto ERROR; | |
1759 | } | |
1760 | ||
1761 | // Allocate the netlink cache | |
1762 | r = rtnl_link_alloc_cache(nl, AF_UNSPEC, &cache); | |
1763 | if (r < 0) { | |
1764 | ERROR(jail->pakfire, "Unable to allocate netlink cache: %s\n", nl_geterror(r)); | |
1765 | goto ERROR; | |
1766 | } | |
1767 | ||
1768 | // Fetch loopback interface | |
1769 | link = rtnl_link_get_by_name(cache, "lo"); | |
1770 | if (!link) { | |
1771 | ERROR(jail->pakfire, "Could not find lo interface. Ignoring.\n"); | |
1772 | r = 0; | |
1773 | goto ERROR; | |
1774 | } | |
1775 | ||
1776 | // Allocate a new link | |
1777 | change = rtnl_link_alloc(); | |
1778 | if (!change) { | |
1779 | ERROR(jail->pakfire, "Could not allocate change link\n"); | |
1780 | r = 1; | |
1781 | goto ERROR; | |
1782 | } | |
1783 | ||
1784 | // Set the link to UP | |
1785 | rtnl_link_set_flags(change, IFF_UP); | |
1786 | ||
1787 | // Apply any changes | |
1788 | r = rtnl_link_change(nl, link, change, 0); | |
1789 | if (r) { | |
1790 | ERROR(jail->pakfire, "Unable to activate loopback: %s\n", nl_geterror(r)); | |
1791 | goto ERROR; | |
1792 | } | |
1793 | ||
1794 | // Success | |
1795 | r = 0; | |
1796 | ||
1797 | ERROR: | |
1798 | if (nl) | |
1799 | nl_socket_free(nl); | |
1800 | ||
1801 | return r; | |
1802 | } | |
1803 | ||
1804 | // UID/GID Mapping | |
1805 | ||
1806 | static int pakfire_jail_setup_uid_mapping(struct pakfire_jail* jail, pid_t pid) { | |
1807 | char path[PATH_MAX]; | |
1808 | int r; | |
1809 | ||
1810 | // Skip mapping anything when running on / | |
1811 | if (pakfire_on_root(jail->pakfire)) | |
1812 | return 0; | |
1813 | ||
1814 | // Make path | |
1815 | r = pakfire_string_format(path, "/proc/%d/uid_map", pid); | |
1816 | if (r) | |
1817 | return r; | |
1818 | ||
1819 | // Fetch UID | |
1820 | const uid_t uid = pakfire_uid(jail->pakfire); | |
1821 | ||
1822 | // Fetch SUBUID | |
1823 | const struct pakfire_subid* subuid = pakfire_subuid(jail->pakfire); | |
1824 | if (!subuid) | |
1825 | return 1; | |
1826 | ||
1827 | /* When running as root, we will map the entire range. | |
1828 | ||
1829 | When running as a non-privileged user, we will map the root user inside the jail | |
1830 | to the user's UID outside of the jail, and we will map the rest starting from one. | |
1831 | */ | |
1832 | ||
1833 | // Running as root | |
1834 | if (uid == 0) { | |
1835 | r = pakfire_file_write(jail->pakfire, path, 0, 0, 0, | |
1836 | "0 %lu %lu\n", subuid->id, subuid->length); | |
1837 | } else { | |
1838 | r = pakfire_file_write(jail->pakfire, path, 0, 0, 0, | |
1839 | "0 %lu 1\n1 %lu %lu\n", uid, subuid->id, subuid->length); | |
1840 | } | |
1841 | ||
1842 | if (r) { | |
1843 | ERROR(jail->pakfire, "Could not map UIDs: %m\n"); | |
1844 | return r; | |
1845 | } | |
1846 | ||
1847 | return r; | |
1848 | } | |
1849 | ||
1850 | static int pakfire_jail_setup_gid_mapping(struct pakfire_jail* jail, pid_t pid) { | |
1851 | char path[PATH_MAX]; | |
1852 | int r; | |
1853 | ||
1854 | // Skip mapping anything when running on / | |
1855 | if (pakfire_on_root(jail->pakfire)) | |
1856 | return 0; | |
1857 | ||
1858 | // Fetch GID | |
1859 | const gid_t gid = pakfire_gid(jail->pakfire); | |
1860 | ||
1861 | // Fetch SUBGID | |
1862 | const struct pakfire_subid* subgid = pakfire_subgid(jail->pakfire); | |
1863 | if (!subgid) | |
1864 | return 1; | |
1865 | ||
1866 | // Make path | |
1867 | r = pakfire_string_format(path, "/proc/%d/gid_map", pid); | |
1868 | if (r) | |
1869 | return r; | |
1870 | ||
1871 | // Running as root | |
1872 | if (gid == 0) { | |
1873 | r = pakfire_file_write(jail->pakfire, path, 0, 0, 0, | |
1874 | "0 %lu %lu\n", subgid->id, subgid->length); | |
1875 | } else { | |
1876 | r = pakfire_file_write(jail->pakfire, path, 0, 0, 0, | |
1877 | "0 %lu 1\n1 %lu %lu\n", gid, subgid->id, subgid->length); | |
1878 | } | |
1879 | ||
1880 | if (r) { | |
1881 | ERROR(jail->pakfire, "Could not map GIDs: %m\n"); | |
1882 | return r; | |
1883 | } | |
1884 | ||
1885 | return r; | |
1886 | } | |
1887 | ||
1888 | static int pakfire_jail_setgroups(struct pakfire_jail* jail, pid_t pid) { | |
1889 | char path[PATH_MAX]; | |
1890 | int r; | |
1891 | ||
1892 | // Make path | |
1893 | r = pakfire_string_format(path, "/proc/%d/setgroups", pid); | |
1894 | if (r) | |
1895 | return r; | |
1896 | ||
1897 | r = pakfire_file_write(jail->pakfire, path, 0, 0, 0, "deny\n"); | |
1898 | if (r) { | |
1899 | CTX_ERROR(jail->ctx, "Could not set setgroups to deny: %s\n", strerror(errno)); | |
1900 | r = -errno; | |
1901 | } | |
1902 | ||
1903 | return r; | |
1904 | } | |
1905 | ||
1906 | static int pakfire_jail_send_signal(struct pakfire_jail* jail, int fd) { | |
1907 | const uint64_t val = 1; | |
1908 | int r = 0; | |
1909 | ||
1910 | DEBUG(jail->pakfire, "Sending signal...\n"); | |
1911 | ||
1912 | // Write to the file descriptor | |
1913 | r = eventfd_write(fd, val); | |
1914 | if (r < 0) { | |
1915 | ERROR(jail->pakfire, "Could not send signal: %s\n", strerror(errno)); | |
1916 | r = -errno; | |
1917 | } | |
1918 | ||
1919 | // Close the file descriptor | |
1920 | close(fd); | |
1921 | ||
1922 | return r; | |
1923 | } | |
1924 | ||
1925 | static int pakfire_jail_wait_for_signal(struct pakfire_jail* jail, int fd) { | |
1926 | uint64_t val = 0; | |
1927 | int r = 0; | |
1928 | ||
1929 | DEBUG(jail->pakfire, "Waiting for signal...\n"); | |
1930 | ||
1931 | r = eventfd_read(fd, &val); | |
1932 | if (r < 0) { | |
1933 | ERROR(jail->pakfire, "Error waiting for signal: %s\n", strerror(errno)); | |
1934 | r = -errno; | |
1935 | } | |
1936 | ||
1937 | // Close the file descriptor | |
1938 | close(fd); | |
1939 | ||
1940 | return r; | |
1941 | } | |
1942 | ||
1943 | /* | |
1944 | Performs the initialisation that needs to happen in the parent part | |
1945 | */ | |
1946 | static int pakfire_jail_parent(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx) { | |
1947 | int r; | |
1948 | ||
1949 | // Setup UID mapping | |
1950 | r = pakfire_jail_setup_uid_mapping(jail, ctx->pid); | |
1951 | if (r) | |
1952 | return r; | |
1953 | ||
1954 | // Write "deny" to /proc/PID/setgroups | |
1955 | r = pakfire_jail_setgroups(jail, ctx->pid); | |
1956 | if (r) | |
1957 | return r; | |
1958 | ||
1959 | // Setup GID mapping | |
1960 | r = pakfire_jail_setup_gid_mapping(jail, ctx->pid); | |
1961 | if (r) | |
1962 | return r; | |
1963 | ||
1964 | // Parent has finished initialisation | |
1965 | DEBUG(jail->pakfire, "Parent has finished initialization\n"); | |
1966 | ||
1967 | // Send signal to client | |
1968 | r = pakfire_jail_send_signal(jail, ctx->completed_fd); | |
1969 | if (r) | |
1970 | return r; | |
1971 | ||
1972 | return 0; | |
1973 | } | |
1974 | ||
1975 | static int pakfire_jail_switch_root(struct pakfire_jail* jail, const char* root) { | |
1976 | int r; | |
1977 | ||
1978 | // Change to the new root | |
1979 | r = chdir(root); | |
1980 | if (r) { | |
1981 | ERROR(jail->pakfire, "chdir(%s) failed: %m\n", root); | |
1982 | return r; | |
1983 | } | |
1984 | ||
1985 | // Switch Root! | |
1986 | r = pivot_root(".", "."); | |
1987 | if (r) { | |
1988 | ERROR(jail->pakfire, "Failed changing into the new root directory %s: %m\n", root); | |
1989 | return r; | |
1990 | } | |
1991 | ||
1992 | // Umount the old root | |
1993 | r = umount2(".", MNT_DETACH); | |
1994 | if (r) { | |
1995 | ERROR(jail->pakfire, "Could not umount the old root filesystem: %m\n"); | |
1996 | return r; | |
1997 | } | |
1998 | ||
1999 | return 0; | |
2000 | } | |
2001 | ||
2002 | static int pakfire_jail_open_pty(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx) { | |
2003 | int r; | |
2004 | ||
2005 | // Allocate a new PTY | |
2006 | ctx->pty.master.fd = posix_openpt(O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC); | |
2007 | if (ctx->pty.master.fd < 0) | |
2008 | return -errno; | |
2009 | ||
2010 | // Fetch the path | |
2011 | r = ptsname_r(ctx->pty.master.fd, ctx->pty.console, sizeof(ctx->pty.console)); | |
2012 | if (r) | |
2013 | return -r; | |
2014 | ||
2015 | CTX_DEBUG(jail->ctx, "Allocated console at %s (%d)\n", ctx->pty.console, ctx->pty.master.fd); | |
2016 | ||
2017 | // Unlock the master device | |
2018 | r = unlockpt(ctx->pty.master.fd); | |
2019 | if (r) { | |
2020 | CTX_ERROR(jail->ctx, "Could not unlock the PTY: %s\n", strerror(errno)); | |
2021 | return -errno; | |
2022 | } | |
2023 | ||
2024 | // Create a symlink | |
2025 | r = pakfire_symlink(jail->ctx, ctx->pty.console, "/dev/console"); | |
2026 | if (r) | |
2027 | return r; | |
2028 | ||
2029 | return r; | |
2030 | } | |
2031 | ||
2032 | static int pakfire_jail_setup_terminal(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx) { | |
2033 | int fd; | |
2034 | int r; | |
2035 | ||
2036 | // Open a new terminal | |
2037 | fd = open("/dev/console", O_RDWR|O_NOCTTY); | |
2038 | if (fd < 0) { | |
2039 | CTX_ERROR(jail->ctx, "Failed to open a new terminal: %s\n", strerror(errno)); | |
2040 | return -errno; | |
2041 | } | |
2042 | ||
2043 | CTX_DEBUG(jail->ctx, "Opened a new terminal %d\n", fd); | |
2044 | ||
2045 | // Connect the new terminal to standard input | |
2046 | r = dup2(fd, STDIN_FILENO); | |
2047 | if (r < 0) { | |
2048 | CTX_ERROR(jail->ctx, "Failed to open standard input: %s\n", strerror(errno)); | |
2049 | return -errno; | |
2050 | } | |
2051 | ||
2052 | // Connect the new terminal to standard output | |
2053 | r = dup2(fd, STDOUT_FILENO); | |
2054 | if (r < 0) { | |
2055 | CTX_ERROR(jail->ctx, "Failed to open standard output: %s\n", strerror(errno)); | |
2056 | return -errno; | |
2057 | } | |
2058 | ||
2059 | // Connect the new terminal to standard error | |
2060 | r = dup2(fd, STDERR_FILENO); | |
2061 | if (r < 0) { | |
2062 | CTX_ERROR(jail->ctx, "Failed to open standard error: %s\n", strerror(errno)); | |
2063 | return -errno; | |
2064 | } | |
2065 | ||
2066 | return 0; | |
2067 | } | |
2068 | ||
2069 | static int pakfire_jail_child(struct pakfire_jail* jail, struct pakfire_jail_exec* ctx, | |
2070 | const char* argv[]) { | |
2071 | int r; | |
2072 | ||
2073 | // Redirect any logging to our log pipe | |
2074 | pakfire_ctx_set_log_callback(jail->ctx, pakfire_jail_log_redirect, &ctx->pipes); | |
2075 | ||
2076 | // Fetch my own PID | |
2077 | pid_t pid = getpid(); | |
2078 | ||
2079 | DEBUG(jail->pakfire, "Launched child process in jail with PID %d\n", pid); | |
2080 | ||
2081 | // Wait for the parent to finish initialization | |
2082 | r = pakfire_jail_wait_for_signal(jail, ctx->completed_fd); | |
2083 | if (r) | |
2084 | return r; | |
2085 | ||
2086 | // Die with parent | |
2087 | r = prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); | |
2088 | if (r) { | |
2089 | ERROR(jail->pakfire, "Could not configure to die with parent: %m\n"); | |
2090 | return 126; | |
2091 | } | |
2092 | ||
2093 | // Make this process dumpable | |
2094 | r = prctl (PR_SET_DUMPABLE, 1, 0, 0, 0); | |
2095 | if (r) { | |
2096 | ERROR(jail->pakfire, "Could not make the process dumpable: %m\n"); | |
2097 | return 126; | |
2098 | } | |
2099 | ||
2100 | // Don't drop any capabilities on setuid() | |
2101 | r = prctl(PR_SET_KEEPCAPS, 1); | |
2102 | if (r) { | |
2103 | ERROR(jail->pakfire, "Could not set PR_SET_KEEPCAPS: %m\n"); | |
2104 | return 126; | |
2105 | } | |
2106 | ||
2107 | // Fetch UID/GID | |
2108 | uid_t uid = getuid(); | |
2109 | gid_t gid = getgid(); | |
2110 | ||
2111 | // Fetch EUID/EGID | |
2112 | uid_t euid = geteuid(); | |
2113 | gid_t egid = getegid(); | |
2114 | ||
2115 | DEBUG(jail->pakfire, " UID: %u (effective %u)\n", uid, euid); | |
2116 | DEBUG(jail->pakfire, " GID: %u (effective %u)\n", gid, egid); | |
2117 | ||
2118 | // Log all mountpoints | |
2119 | pakfire_mount_list(jail->ctx); | |
2120 | ||
2121 | // Fail if we are not PID 1 | |
2122 | if (pid != 1) { | |
2123 | CTX_ERROR(jail->ctx, "Child process is not PID 1\n"); | |
2124 | return 126; | |
2125 | } | |
2126 | ||
2127 | // Fail if we are not running as root | |
2128 | if (uid || gid || euid || egid) { | |
2129 | ERROR(jail->pakfire, "Child process is not running as root\n"); | |
2130 | return 126; | |
2131 | } | |
2132 | ||
2133 | const int socket_send = pakfire_jail_get_pipe_to_write(jail, &ctx->socket); | |
2134 | ||
2135 | // Mount all default stuff | |
2136 | r = pakfire_mount_all(jail->pakfire, PAKFIRE_MNTNS_INNER, 0); | |
2137 | if (r) | |
2138 | return 126; | |
2139 | ||
2140 | const char* root = pakfire_get_path(jail->pakfire); | |
2141 | const char* arch = pakfire_get_effective_arch(jail->pakfire); | |
2142 | ||
2143 | // Change mount propagation to slave to receive anything from the parent namespace | |
2144 | r = pakfire_mount_change_propagation(jail->ctx, "/", MS_SLAVE); | |
2145 | if (r) | |
2146 | return r; | |
2147 | ||
2148 | // Make root a mountpoint in the new mount namespace | |
2149 | r = pakfire_mount_make_mounpoint(jail->pakfire, root); | |
2150 | if (r) | |
2151 | return r; | |
2152 | ||
2153 | // Change mount propagation to private | |
2154 | r = pakfire_mount_change_propagation(jail->ctx, root, MS_PRIVATE); | |
2155 | if (r) | |
2156 | return r; | |
2157 | ||
2158 | // Change root (unless root is /) | |
2159 | if (!pakfire_on_root(jail->pakfire)) { | |
2160 | // Mount everything | |
2161 | r = pakfire_jail_mount(jail, ctx); | |
2162 | if (r) | |
2163 | return r; | |
2164 | ||
2165 | // chroot() | |
2166 | r = pakfire_jail_switch_root(jail, root); | |
2167 | if (r) | |
2168 | return r; | |
2169 | } | |
2170 | ||
2171 | // Set personality | |
2172 | unsigned long persona = pakfire_arch_personality(arch); | |
2173 | if (persona) { | |
2174 | r = personality(persona); | |
2175 | if (r < 0) { | |
2176 | ERROR(jail->pakfire, "Could not set personality (%x)\n", (unsigned int)persona); | |
2177 | return 1; | |
2178 | } | |
2179 | } | |
2180 | ||
2181 | // Setup networking | |
2182 | if (!pakfire_jail_exec_has_flag(ctx, PAKFIRE_JAIL_HAS_NETWORKING)) { | |
2183 | r = pakfire_jail_setup_loopback(jail); | |
2184 | if (r) | |
2185 | return 1; | |
2186 | } | |
2187 | ||
2188 | // Set nice level | |
2189 | if (jail->nice) { | |
2190 | DEBUG(jail->pakfire, "Setting nice level to %d\n", jail->nice); | |
2191 | ||
2192 | r = setpriority(PRIO_PROCESS, pid, jail->nice); | |
2193 | if (r) { | |
2194 | ERROR(jail->pakfire, "Could not set nice level: %m\n"); | |
2195 | return 1; | |
2196 | } | |
2197 | } | |
2198 | ||
2199 | // Create a new session | |
2200 | r = setsid(); | |
2201 | if (r < 0) { | |
2202 | CTX_ERROR(jail->ctx, "Could not create a new session: %s\n", strerror(errno)); | |
2203 | return r; | |
2204 | } | |
2205 | ||
2206 | // Allocate a new PTY | |
2207 | r = pakfire_jail_open_pty(jail, ctx); | |
2208 | if (r) { | |
2209 | CTX_ERROR(jail->ctx, "Could not allocate a new PTY: %s\n", strerror(-r)); | |
2210 | return r; | |
2211 | } | |
2212 | ||
2213 | // Send the PTY master to the parent process | |
2214 | r = pakfire_jail_send_fd(jail, socket_send, ctx->pty.master.fd); | |
2215 | if (r) { | |
2216 | CTX_ERROR(jail->ctx, "Failed sending the PTY master to the parent: %s\n", strerror(-r)); | |
2217 | return r; | |
2218 | } | |
2219 | ||
2220 | // Setup the terminal | |
2221 | r = pakfire_jail_setup_terminal(jail, ctx); | |
2222 | if (r) | |
2223 | return r; | |
2224 | ||
2225 | // Close the master of the PTY | |
2226 | close(ctx->pty.master.fd); | |
2227 | ctx->pty.master.fd = -1; | |
2228 | ||
2229 | // Close the socket | |
2230 | close(socket_send); | |
2231 | ||
2232 | // Close other end of log pipes | |
2233 | close(ctx->pipes.log_INFO[0]); | |
2234 | close(ctx->pipes.log_ERROR[0]); | |
2235 | #ifdef ENABLE_DEBUG | |
2236 | close(ctx->pipes.log_DEBUG[0]); | |
2237 | #endif /* ENABLE_DEBUG */ | |
2238 | ||
2239 | // Reset open file limit (http://0pointer.net/blog/file-descriptor-limits.html) | |
2240 | r = pakfire_rlimit_reset_nofile(jail->pakfire); | |
2241 | if (r) | |
2242 | return r; | |
2243 | ||
2244 | // Set capabilities | |
2245 | r = pakfire_jail_set_capabilities(jail); | |
2246 | if (r) | |
2247 | return r; | |
2248 | ||
2249 | // Show capabilities | |
2250 | r = pakfire_jail_show_capabilities(jail); | |
2251 | if (r) | |
2252 | return r; | |
2253 | ||
2254 | // Filter syscalls | |
2255 | r = pakfire_jail_limit_syscalls(jail); | |
2256 | if (r) | |
2257 | return r; | |
2258 | ||
2259 | DEBUG(jail->pakfire, "Child process initialization done\n"); | |
2260 | DEBUG(jail->pakfire, "Launching command:\n"); | |
2261 | ||
2262 | // Log argv | |
2263 | for (unsigned int i = 0; argv[i]; i++) | |
2264 | DEBUG(jail->pakfire, " argv[%u] = %s\n", i, argv[i]); | |
2265 | ||
2266 | // exec() command | |
2267 | r = execvpe(argv[0], (char**)argv, jail->env); | |
2268 | if (r < 0) { | |
2269 | // Translate errno into regular exit code | |
2270 | switch (errno) { | |
2271 | case ENOENT: | |
2272 | // Ignore if the command doesn't exist | |
2273 | if (ctx->flags & PAKFIRE_JAIL_NOENT_OK) | |
2274 | r = 0; | |
2275 | else | |
2276 | r = 127; | |
2277 | ||
2278 | break; | |
2279 | ||
2280 | default: | |
2281 | r = 1; | |
2282 | } | |
2283 | ||
2284 | ERROR(jail->pakfire, "Could not execve(%s): %m\n", argv[0]); | |
2285 | } | |
2286 | ||
2287 | // We should not get here | |
2288 | return r; | |
2289 | } | |
2290 | ||
2291 | // Run a command in the jail | |
2292 | static int __pakfire_jail_exec(struct pakfire_jail* jail, const char* argv[], | |
2293 | pakfire_jail_communicate_in communicate_in, | |
2294 | pakfire_jail_communicate_out communicate_out, | |
2295 | void* data, int flags) { | |
2296 | int exit = -1; | |
2297 | int r; | |
2298 | ||
2299 | // Check if argv is valid | |
2300 | if (!argv || !argv[0]) { | |
2301 | errno = EINVAL; | |
2302 | return -1; | |
2303 | } | |
2304 | ||
2305 | // Initialize context for this call | |
2306 | struct pakfire_jail_exec ctx = { | |
2307 | .flags = flags, | |
2308 | ||
2309 | .socket = { -1, -1 }, | |
2310 | ||
2311 | .pipes = { | |
2312 | .log_INFO = { -1, -1 }, | |
2313 | .log_ERROR = { -1, -1 }, | |
2314 | #ifdef ENABLE_DEBUG | |
2315 | .log_DEBUG = { -1, -1 }, | |
2316 | #endif /* ENABLE_DEBUG */ | |
2317 | }, | |
2318 | ||
2319 | .communicate = { | |
2320 | .in = communicate_in, | |
2321 | .out = communicate_out, | |
2322 | .data = data, | |
2323 | }, | |
2324 | ||
2325 | .pidfd = -1, | |
2326 | ||
2327 | // PTY | |
2328 | .pty = { | |
2329 | .master = { | |
2330 | .fd = -1, | |
2331 | }, | |
2332 | .stdin = { | |
2333 | .fd = -1, | |
2334 | }, | |
2335 | .stdout = { | |
2336 | .fd = -1, | |
2337 | }, | |
2338 | }, | |
2339 | }; | |
2340 | ||
2341 | DEBUG(jail->pakfire, "Executing jail...\n"); | |
2342 | ||
2343 | // Enable networking in interactive mode | |
2344 | if (ctx.flags & PAKFIRE_JAIL_PTY_FORWARDING) | |
2345 | ctx.flags |= PAKFIRE_JAIL_HAS_NETWORKING; | |
2346 | ||
2347 | /* | |
2348 | Setup a file descriptor which can be used to notify the client that the parent | |
2349 | has completed configuration. | |
2350 | */ | |
2351 | ctx.completed_fd = eventfd(0, EFD_CLOEXEC); | |
2352 | if (ctx.completed_fd < 0) { | |
2353 | ERROR(jail->pakfire, "eventfd() failed: %m\n"); | |
2354 | return -1; | |
2355 | } | |
2356 | ||
2357 | // Create a UNIX domain socket | |
2358 | r = socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, ctx.socket); | |
2359 | if (r < 0) { | |
2360 | CTX_ERROR(jail->ctx, "Could not create UNIX socket: %s\n", strerror(errno)); | |
2361 | r = -errno; | |
2362 | goto ERROR; | |
2363 | } | |
2364 | ||
2365 | // Setup pipes for logging | |
2366 | // INFO | |
2367 | r = pakfire_jail_setup_pipe(jail, &ctx.pipes.log_INFO, O_CLOEXEC); | |
2368 | if (r) | |
2369 | goto ERROR; | |
2370 | ||
2371 | // ERROR | |
2372 | r = pakfire_jail_setup_pipe(jail, &ctx.pipes.log_ERROR, O_CLOEXEC); | |
2373 | if (r) | |
2374 | goto ERROR; | |
2375 | ||
2376 | #ifdef ENABLE_DEBUG | |
2377 | // DEBUG | |
2378 | r = pakfire_jail_setup_pipe(jail, &ctx.pipes.log_DEBUG, O_CLOEXEC); | |
2379 | if (r) | |
2380 | goto ERROR; | |
2381 | #endif /* ENABLE_DEBUG */ | |
2382 | ||
2383 | // Configure child process | |
2384 | struct clone_args args = { | |
2385 | .flags = | |
2386 | CLONE_NEWCGROUP | | |
2387 | CLONE_NEWIPC | | |
2388 | CLONE_NEWNS | | |
2389 | CLONE_NEWPID | | |
2390 | CLONE_NEWTIME | | |
2391 | CLONE_NEWUSER | | |
2392 | CLONE_NEWUTS | | |
2393 | CLONE_PIDFD, | |
2394 | .exit_signal = SIGCHLD, | |
2395 | .pidfd = (long long unsigned int)&ctx.pidfd, | |
2396 | }; | |
2397 | ||
2398 | // Launch the process in a cgroup that is a leaf of the configured cgroup | |
2399 | if (jail->cgroup) { | |
2400 | args.flags |= CLONE_INTO_CGROUP; | |
2401 | ||
2402 | // Fetch our UUID | |
2403 | const char* uuid = pakfire_jail_uuid(jail); | |
2404 | ||
2405 | // Create a temporary cgroup | |
2406 | r = pakfire_cgroup_child(&ctx.cgroup, jail->cgroup, uuid, 0); | |
2407 | if (r) { | |
2408 | ERROR(jail->pakfire, "Could not create cgroup for jail: %m\n"); | |
2409 | goto ERROR; | |
2410 | } | |
2411 | ||
2412 | // Clone into this cgroup | |
2413 | args.cgroup = pakfire_cgroup_fd(ctx.cgroup); | |
2414 | } | |
2415 | ||
2416 | // Setup networking | |
2417 | if (!pakfire_jail_exec_has_flag(&ctx, PAKFIRE_JAIL_HAS_NETWORKING)) { | |
2418 | args.flags |= CLONE_NEWNET; | |
2419 | } | |
2420 | ||
2421 | // Fork this process | |
2422 | ctx.pid = clone3(&args, sizeof(args)); | |
2423 | if (ctx.pid < 0) { | |
2424 | ERROR(jail->pakfire, "Could not clone: %m\n"); | |
2425 | return -1; | |
2426 | ||
2427 | // Child process | |
2428 | } else if (ctx.pid == 0) { | |
2429 | r = pakfire_jail_child(jail, &ctx, argv); | |
2430 | _exit(r); | |
2431 | } | |
2432 | ||
2433 | // Parent process | |
2434 | r = pakfire_jail_parent(jail, &ctx); | |
2435 | if (r) | |
2436 | goto ERROR; | |
2437 | ||
2438 | DEBUG(jail->pakfire, "Waiting for PID %d to finish its work\n", ctx.pid); | |
2439 | ||
2440 | // Read output of the child process | |
2441 | r = pakfire_jail_wait(jail, &ctx); | |
2442 | if (r) | |
2443 | goto ERROR; | |
2444 | ||
2445 | // Handle exit status | |
2446 | switch (ctx.status.si_code) { | |
2447 | case CLD_EXITED: | |
2448 | DEBUG(jail->pakfire, "The child process exited with code %d\n", | |
2449 | ctx.status.si_status); | |
2450 | ||
2451 | // Pass exit code | |
2452 | exit = ctx.status.si_status; | |
2453 | break; | |
2454 | ||
2455 | case CLD_KILLED: | |
2456 | ERROR(jail->pakfire, "The child process was killed\n"); | |
2457 | exit = 139; | |
2458 | break; | |
2459 | ||
2460 | case CLD_DUMPED: | |
2461 | ERROR(jail->pakfire, "The child process terminated abnormally\n"); | |
2462 | break; | |
2463 | ||
2464 | // Log anything else | |
2465 | default: | |
2466 | ERROR(jail->pakfire, "Unknown child exit code: %d\n", ctx.status.si_code); | |
2467 | break; | |
2468 | } | |
2469 | ||
2470 | ERROR: | |
2471 | // Destroy the temporary cgroup (if any) | |
2472 | if (ctx.cgroup) { | |
2473 | // Read cgroup stats | |
2474 | pakfire_cgroup_stat(ctx.cgroup, &ctx.cgroup_stats); | |
2475 | pakfire_cgroup_stat_dump(ctx.cgroup, &ctx.cgroup_stats); | |
2476 | pakfire_cgroup_destroy(ctx.cgroup); | |
2477 | pakfire_cgroup_unref(ctx.cgroup); | |
2478 | } | |
2479 | ||
2480 | // Close any file descriptors | |
2481 | if (ctx.pidfd >= 0) | |
2482 | close(ctx.pidfd); | |
2483 | if (ctx.pty.master.fd >= 0) | |
2484 | close(ctx.pty.master.fd); | |
2485 | pakfire_jail_close_pipe(jail, ctx.pipes.log_INFO); | |
2486 | pakfire_jail_close_pipe(jail, ctx.pipes.log_ERROR); | |
2487 | #ifdef ENABLE_DEBUG | |
2488 | pakfire_jail_close_pipe(jail, ctx.pipes.log_DEBUG); | |
2489 | #endif /* ENABLE_DEBUG */ | |
2490 | pakfire_jail_close_pipe(jail, ctx.socket); | |
2491 | ||
2492 | return exit; | |
2493 | } | |
2494 | ||
2495 | PAKFIRE_EXPORT int pakfire_jail_exec( | |
2496 | struct pakfire_jail* jail, | |
2497 | const char* argv[], | |
2498 | pakfire_jail_communicate_in callback_in, | |
2499 | pakfire_jail_communicate_out callback_out, | |
2500 | void* data, int flags) { | |
2501 | return __pakfire_jail_exec(jail, argv, callback_in, callback_out, data, flags); | |
2502 | } | |
2503 | ||
2504 | static int pakfire_jail_exec_interactive( | |
2505 | struct pakfire_jail* jail, const char* argv[], int flags) { | |
2506 | int r; | |
2507 | ||
2508 | flags |= PAKFIRE_JAIL_PTY_FORWARDING; | |
2509 | ||
2510 | // Setup interactive stuff | |
2511 | r = pakfire_jail_setup_interactive_env(jail); | |
2512 | if (r) | |
2513 | return r; | |
2514 | ||
2515 | return __pakfire_jail_exec(jail, argv, NULL, NULL, NULL, flags); | |
2516 | } | |
2517 | ||
2518 | int pakfire_jail_exec_script(struct pakfire_jail* jail, | |
2519 | const char* script, | |
2520 | const size_t size, | |
2521 | const char* args[], | |
2522 | pakfire_jail_communicate_in callback_in, | |
2523 | pakfire_jail_communicate_out callback_out, | |
2524 | void* data) { | |
2525 | char path[PATH_MAX]; | |
2526 | const char** argv = NULL; | |
2527 | FILE* f = NULL; | |
2528 | int r; | |
2529 | ||
2530 | const char* root = pakfire_get_path(jail->pakfire); | |
2531 | ||
2532 | // Write the scriptlet to disk | |
2533 | r = pakfire_path_append(path, root, PAKFIRE_TMP_DIR "/pakfire-script.XXXXXX"); | |
2534 | if (r) | |
2535 | goto ERROR; | |
2536 | ||
2537 | // Create a temporary file | |
2538 | f = pakfire_mktemp(path, 0700); | |
2539 | if (!f) { | |
2540 | ERROR(jail->pakfire, "Could not create temporary file: %m\n"); | |
2541 | goto ERROR; | |
2542 | } | |
2543 | ||
2544 | DEBUG(jail->pakfire, "Writing script to %s:\n%.*s\n", path, (int)size, script); | |
2545 | ||
2546 | // Write data | |
2547 | r = fprintf(f, "%s", script); | |
2548 | if (r < 0) { | |
2549 | ERROR(jail->pakfire, "Could not write script to file %s: %m\n", path); | |
2550 | goto ERROR; | |
2551 | } | |
2552 | ||
2553 | // Close file | |
2554 | r = fclose(f); | |
2555 | if (r) { | |
2556 | ERROR(jail->pakfire, "Could not close script file %s: %m\n", path); | |
2557 | goto ERROR; | |
2558 | } | |
2559 | ||
2560 | f = NULL; | |
2561 | ||
2562 | // Count how many arguments were passed | |
2563 | unsigned int argc = 1; | |
2564 | if (args) { | |
2565 | for (const char** arg = args; *arg; arg++) | |
2566 | argc++; | |
2567 | } | |
2568 | ||
2569 | argv = calloc(argc + 1, sizeof(*argv)); | |
2570 | if (!argv) { | |
2571 | ERROR(jail->pakfire, "Could not allocate argv: %m\n"); | |
2572 | goto ERROR; | |
2573 | } | |
2574 | ||
2575 | // Set command | |
2576 | argv[0] = (root) ? pakfire_path_relpath(root, path) : path; | |
2577 | ||
2578 | // Copy args | |
2579 | for (unsigned int i = 1; i < argc; i++) | |
2580 | argv[i] = args[i-1]; | |
2581 | ||
2582 | // Run the script | |
2583 | r = pakfire_jail_exec(jail, argv, callback_in, callback_out, data, 0); | |
2584 | ||
2585 | ERROR: | |
2586 | if (argv) | |
2587 | free(argv); | |
2588 | if (f) | |
2589 | fclose(f); | |
2590 | ||
2591 | // Remove script from disk | |
2592 | if (*path) | |
2593 | unlink(path); | |
2594 | ||
2595 | return r; | |
2596 | } | |
2597 | ||
2598 | /* | |
2599 | A convenience function that creates a new jail, runs the given command and destroys | |
2600 | the jail again. | |
2601 | */ | |
2602 | int pakfire_jail_run(struct pakfire* pakfire, const char* argv[], int flags, char** output) { | |
2603 | struct pakfire_jail* jail = NULL; | |
2604 | int r; | |
2605 | ||
2606 | // Create a new jail | |
2607 | r = pakfire_jail_create(&jail, pakfire); | |
2608 | if (r) | |
2609 | goto ERROR; | |
2610 | ||
2611 | // Execute the command | |
2612 | r = pakfire_jail_exec(jail, argv, NULL, pakfire_jail_capture_stdout, output, 0); | |
2613 | ||
2614 | ERROR: | |
2615 | if (jail) | |
2616 | pakfire_jail_unref(jail); | |
2617 | ||
2618 | return r; | |
2619 | } | |
2620 | ||
2621 | int pakfire_jail_run_script(struct pakfire* pakfire, | |
2622 | const char* script, const size_t length, const char* argv[], int flags) { | |
2623 | struct pakfire_jail* jail = NULL; | |
2624 | int r; | |
2625 | ||
2626 | // Create a new jail | |
2627 | r = pakfire_jail_create(&jail, pakfire); | |
2628 | if (r) | |
2629 | goto ERROR; | |
2630 | ||
2631 | // Execute the command | |
2632 | r = pakfire_jail_exec_script(jail, script, length, argv, NULL, NULL, NULL); | |
2633 | ||
2634 | ERROR: | |
2635 | if (jail) | |
2636 | pakfire_jail_unref(jail); | |
2637 | ||
2638 | return r; | |
2639 | } | |
2640 | ||
2641 | int pakfire_jail_shell(struct pakfire_jail* jail) { | |
2642 | int r; | |
2643 | ||
2644 | const char* argv[] = { | |
2645 | "/bin/bash", "--login", NULL, | |
2646 | }; | |
2647 | ||
2648 | // Execute /bin/bash | |
2649 | r = pakfire_jail_exec_interactive(jail, argv, 0); | |
2650 | ||
2651 | // Raise any errors | |
2652 | if (r < 0) | |
2653 | return r; | |
2654 | ||
2655 | // Ignore any return codes from the shell | |
2656 | return 0; | |
2657 | } | |
2658 | ||
2659 | static int pakfire_jail_run_if_possible(struct pakfire* pakfire, const char** argv) { | |
2660 | char path[PATH_MAX]; | |
2661 | int r; | |
2662 | ||
2663 | r = pakfire_path(pakfire, path, "%s", *argv); | |
2664 | if (r) | |
2665 | return r; | |
2666 | ||
2667 | // Check if the file is executable | |
2668 | r = access(path, X_OK); | |
2669 | if (r) { | |
2670 | DEBUG(pakfire, "%s is not executable. Skipping...\n", *argv); | |
2671 | return 0; | |
2672 | } | |
2673 | ||
2674 | return pakfire_jail_run(pakfire, argv, 0, NULL); | |
2675 | } | |
2676 | ||
2677 | int pakfire_jail_ldconfig(struct pakfire* pakfire) { | |
2678 | const char* argv[] = { | |
2679 | "/sbin/ldconfig", | |
2680 | NULL, | |
2681 | }; | |
2682 | ||
2683 | return pakfire_jail_run_if_possible(pakfire, argv); | |
2684 | } | |
2685 | ||
2686 | int pakfire_jail_run_systemd_tmpfiles(struct pakfire* pakfire) { | |
2687 | const char* argv[] = { | |
2688 | "/usr/bin/systemd-tmpfiles", | |
2689 | "--create", | |
2690 | NULL, | |
2691 | }; | |
2692 | ||
2693 | return pakfire_jail_run_if_possible(pakfire, argv); | |
2694 | } |