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ec16f3b6 LP |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | ||
3 | #include <sched.h> | |
4 | #include <sys/utsname.h> | |
5 | ||
6 | #include "analyze-security.h" | |
7 | #include "bus-error.h" | |
8 | #include "bus-unit-util.h" | |
9 | #include "bus-util.h" | |
10 | #include "env-util.h" | |
11 | #include "format-table.h" | |
12 | #include "in-addr-util.h" | |
13 | #include "locale-util.h" | |
14 | #include "macro.h" | |
15 | #include "parse-util.h" | |
16 | #include "path-util.h" | |
17 | #include "pretty-print.h" | |
18 | #include "seccomp-util.h" | |
19 | #include "set.h" | |
20 | #include "stdio-util.h" | |
21 | #include "strv.h" | |
22 | #include "terminal-util.h" | |
23 | #include "unit-def.h" | |
24 | #include "unit-name.h" | |
25 | ||
26 | struct security_info { | |
27 | char *id; | |
28 | char *type; | |
29 | char *load_state; | |
30 | char *fragment_path; | |
31 | bool default_dependencies; | |
32 | ||
33 | uint64_t ambient_capabilities; | |
34 | uint64_t capability_bounding_set; | |
35 | ||
36 | char *user; | |
37 | char **supplementary_groups; | |
38 | bool dynamic_user; | |
39 | ||
40 | bool ip_address_deny_all; | |
41 | bool ip_address_allow_localhost; | |
42 | bool ip_address_allow_other; | |
43 | ||
44 | char *keyring_mode; | |
45 | bool lock_personality; | |
46 | bool memory_deny_write_execute; | |
47 | bool no_new_privileges; | |
48 | char *notify_access; | |
49 | ||
50 | bool private_devices; | |
51 | bool private_mounts; | |
52 | bool private_network; | |
53 | bool private_tmp; | |
54 | bool private_users; | |
55 | ||
56 | bool protect_control_groups; | |
57 | bool protect_kernel_modules; | |
58 | bool protect_kernel_tunables; | |
59 | ||
60 | char *protect_home; | |
61 | char *protect_system; | |
62 | ||
63 | bool remove_ipc; | |
64 | ||
65 | bool restrict_address_family_inet; | |
66 | bool restrict_address_family_unix; | |
67 | bool restrict_address_family_netlink; | |
68 | bool restrict_address_family_packet; | |
69 | bool restrict_address_family_other; | |
70 | ||
71 | uint64_t restrict_namespaces; | |
72 | bool restrict_realtime; | |
73 | ||
74 | char *root_directory; | |
75 | char *root_image; | |
76 | ||
77 | bool delegate; | |
78 | char *device_policy; | |
79 | bool device_allow_non_empty; | |
80 | ||
81 | char **system_call_architectures; | |
82 | ||
83 | bool system_call_filter_whitelist; | |
84 | Set *system_call_filter; | |
85 | ||
86 | uint32_t _umask; | |
87 | }; | |
88 | ||
89 | struct security_assessor { | |
90 | const char *id; | |
91 | const char *description_good; | |
92 | const char *description_bad; | |
93 | const char *description_na; | |
94 | const char *url; | |
95 | uint64_t weight; | |
96 | uint64_t range; | |
97 | int (*assess)(const struct security_assessor *a, const struct security_info *info, const void *data, uint64_t *ret_badness, char **ret_description); | |
98 | size_t offset; | |
99 | uint64_t parameter; | |
100 | bool default_dependencies_only; | |
101 | }; | |
102 | ||
103 | static void security_info_free(struct security_info *i) { | |
104 | if (!i) | |
105 | return; | |
106 | ||
107 | free(i->id); | |
108 | free(i->type); | |
109 | free(i->load_state); | |
110 | free(i->fragment_path); | |
111 | ||
112 | free(i->user); | |
113 | ||
114 | free(i->protect_home); | |
115 | free(i->protect_system); | |
116 | ||
117 | free(i->root_directory); | |
118 | free(i->root_image); | |
119 | ||
120 | free(i->keyring_mode); | |
121 | free(i->notify_access); | |
122 | ||
123 | free(i->device_policy); | |
124 | ||
125 | strv_free(i->supplementary_groups); | |
126 | strv_free(i->system_call_architectures); | |
127 | ||
128 | set_free_free(i->system_call_filter); | |
129 | } | |
130 | ||
131 | static bool security_info_runs_privileged(const struct security_info *i) { | |
132 | assert(i); | |
133 | ||
134 | if (STRPTR_IN_SET(i->user, "0", "root")) | |
135 | return true; | |
136 | ||
137 | if (i->dynamic_user) | |
138 | return false; | |
139 | ||
140 | return isempty(i->user); | |
141 | } | |
142 | ||
143 | static int assess_bool( | |
144 | const struct security_assessor *a, | |
145 | const struct security_info *info, | |
146 | const void *data, | |
147 | uint64_t *ret_badness, | |
148 | char **ret_description) { | |
149 | ||
150 | const bool *b = data; | |
151 | ||
152 | assert(b); | |
153 | assert(ret_badness); | |
154 | assert(ret_description); | |
155 | ||
156 | *ret_badness = a->parameter ? *b : !*b; | |
157 | *ret_description = NULL; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static int assess_user( | |
163 | const struct security_assessor *a, | |
164 | const struct security_info *info, | |
165 | const void *data, | |
166 | uint64_t *ret_badness, | |
167 | char **ret_description) { | |
168 | ||
169 | _cleanup_free_ char *d = NULL; | |
170 | uint64_t b; | |
171 | ||
172 | assert(ret_badness); | |
173 | assert(ret_description); | |
174 | ||
175 | if (streq_ptr(info->user, NOBODY_USER_NAME)) { | |
176 | d = strdup("Service runs under as '" NOBODY_USER_NAME "' user, which should not be used for services"); | |
177 | b = 9; | |
178 | } else if (info->dynamic_user && !STR_IN_SET(info->user, "0", "root")) { | |
179 | d = strdup("Service runs under a transient non-root user identity"); | |
180 | b = 0; | |
181 | } else if (info->user && !STR_IN_SET(info->user, "0", "root", "")) { | |
182 | d = strdup("Service runs under a static non-root user identity"); | |
183 | b = 0; | |
184 | } else { | |
185 | *ret_badness = 10; | |
186 | *ret_description = NULL; | |
187 | return 0; | |
188 | } | |
189 | ||
190 | if (!d) | |
191 | return log_oom(); | |
192 | ||
193 | *ret_badness = b; | |
194 | *ret_description = TAKE_PTR(d); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int assess_protect_home( | |
200 | const struct security_assessor *a, | |
201 | const struct security_info *info, | |
202 | const void *data, | |
203 | uint64_t *ret_badness, | |
204 | char **ret_description) { | |
205 | ||
206 | const char *description; | |
207 | uint64_t badness; | |
208 | char *copy; | |
209 | int r; | |
210 | ||
211 | assert(ret_badness); | |
212 | assert(ret_description); | |
213 | ||
214 | badness = 10; | |
215 | description = "Service has full access to home directories"; | |
216 | ||
217 | r = parse_boolean(info->protect_home); | |
218 | if (r < 0) { | |
219 | if (streq_ptr(info->protect_home, "read-only")) { | |
220 | badness = 5; | |
221 | description = "Service has read-only access to home directories"; | |
222 | } else if (streq_ptr(info->protect_home, "tmpfs")) { | |
223 | badness = 1; | |
224 | description = "Service has access to fake empty home directories"; | |
225 | } | |
226 | } else if (r > 0) { | |
227 | badness = 0; | |
228 | description = "Service has no access to home directories"; | |
229 | } | |
230 | ||
231 | copy = strdup(description); | |
232 | if (!copy) | |
233 | return log_oom(); | |
234 | ||
235 | *ret_badness = badness; | |
236 | *ret_description = copy; | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static int assess_protect_system( | |
242 | const struct security_assessor *a, | |
243 | const struct security_info *info, | |
244 | const void *data, | |
245 | uint64_t *ret_badness, | |
246 | char **ret_description) { | |
247 | ||
248 | const char *description; | |
249 | uint64_t badness; | |
250 | char *copy; | |
251 | int r; | |
252 | ||
253 | assert(ret_badness); | |
254 | assert(ret_description); | |
255 | ||
256 | badness = 10; | |
257 | description = "Service has full access the OS file hierarchy"; | |
258 | ||
259 | r = parse_boolean(info->protect_system); | |
260 | if (r < 0) { | |
261 | if (streq_ptr(info->protect_system, "full")) { | |
262 | badness = 3; | |
263 | description = "Service has very limited write access to OS file hierarchy"; | |
264 | } else if (streq_ptr(info->protect_system, "strict")) { | |
265 | badness = 0; | |
266 | description = "Service has strict read-only access to the OS file hierarchy"; | |
267 | } | |
268 | } else if (r > 0) { | |
269 | badness = 5; | |
270 | description = "Service has limited write access to the OS file hierarchy"; | |
271 | } | |
272 | ||
273 | copy = strdup(description); | |
274 | if (!copy) | |
275 | return log_oom(); | |
276 | ||
277 | *ret_badness = badness; | |
278 | *ret_description = copy; | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | static int assess_root_directory( | |
284 | const struct security_assessor *a, | |
285 | const struct security_info *info, | |
286 | const void *data, | |
287 | uint64_t *ret_badness, | |
288 | char **ret_description) { | |
289 | ||
290 | assert(ret_badness); | |
291 | assert(ret_description); | |
292 | ||
293 | *ret_badness = | |
294 | (isempty(info->root_directory) || | |
295 | path_equal(info->root_directory, "/")) && | |
296 | (isempty(info->root_image) || | |
297 | path_equal(info->root_image, "/")); | |
298 | *ret_description = NULL; | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static int assess_capability_bounding_set( | |
304 | const struct security_assessor *a, | |
305 | const struct security_info *info, | |
306 | const void *data, | |
307 | uint64_t *ret_badness, | |
308 | char **ret_description) { | |
309 | ||
310 | assert(ret_badness); | |
311 | assert(ret_description); | |
312 | ||
313 | *ret_badness = !!(info->capability_bounding_set & a->parameter); | |
314 | *ret_description = NULL; | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static int assess_umask( | |
320 | const struct security_assessor *a, | |
321 | const struct security_info *info, | |
322 | const void *data, | |
323 | uint64_t *ret_badness, | |
324 | char **ret_description) { | |
325 | ||
326 | char *copy = NULL; | |
327 | const char *d; | |
328 | uint64_t b; | |
329 | ||
330 | assert(ret_badness); | |
331 | assert(ret_description); | |
332 | ||
333 | if (!FLAGS_SET(info->_umask, 0002)) { | |
334 | d = "Files created by service are world-writable by default"; | |
335 | b = 10; | |
336 | } else if (!FLAGS_SET(info->_umask, 0004)) { | |
337 | d = "Files created by service are world-readable by default"; | |
338 | b = 5; | |
339 | } else if (!FLAGS_SET(info->_umask, 0020)) { | |
340 | d = "Files created by service are group-writable by default"; | |
341 | b = 2; | |
342 | } else if (!FLAGS_SET(info->_umask, 0040)) { | |
343 | d = "Files created by service are group-readable by default"; | |
344 | b = 1; | |
345 | } else { | |
346 | d = "Files created by service are accessible only by service's own user by default"; | |
347 | b = 0; | |
348 | } | |
349 | ||
350 | copy = strdup(d); | |
351 | if (!copy) | |
352 | return log_oom(); | |
353 | ||
354 | *ret_badness = b; | |
355 | *ret_description = copy; | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | static int assess_keyring_mode( | |
361 | const struct security_assessor *a, | |
362 | const struct security_info *info, | |
363 | const void *data, | |
364 | uint64_t *ret_badness, | |
365 | char **ret_description) { | |
366 | ||
367 | assert(ret_badness); | |
368 | assert(ret_description); | |
369 | ||
370 | *ret_badness = !streq_ptr(info->keyring_mode, "private"); | |
371 | *ret_description = NULL; | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | static int assess_notify_access( | |
377 | const struct security_assessor *a, | |
378 | const struct security_info *info, | |
379 | const void *data, | |
380 | uint64_t *ret_badness, | |
381 | char **ret_description) { | |
382 | ||
383 | assert(ret_badness); | |
384 | assert(ret_description); | |
385 | ||
386 | *ret_badness = streq_ptr(info->notify_access, "all"); | |
387 | *ret_description = NULL; | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | static int assess_remove_ipc( | |
393 | const struct security_assessor *a, | |
394 | const struct security_info *info, | |
395 | const void *data, | |
396 | uint64_t *ret_badness, | |
397 | char **ret_description) { | |
398 | ||
399 | assert(ret_badness); | |
400 | assert(ret_description); | |
401 | ||
402 | if (security_info_runs_privileged(info)) | |
403 | *ret_badness = UINT64_MAX; | |
404 | else | |
405 | *ret_badness = !info->remove_ipc; | |
406 | ||
407 | *ret_description = NULL; | |
408 | return 0; | |
409 | } | |
410 | ||
411 | static int assess_supplementary_groups( | |
412 | const struct security_assessor *a, | |
413 | const struct security_info *info, | |
414 | const void *data, | |
415 | uint64_t *ret_badness, | |
416 | char **ret_description) { | |
417 | ||
418 | assert(ret_badness); | |
419 | assert(ret_description); | |
420 | ||
421 | if (security_info_runs_privileged(info)) | |
422 | *ret_badness = UINT64_MAX; | |
423 | else | |
424 | *ret_badness = !strv_isempty(info->supplementary_groups); | |
425 | ||
426 | *ret_description = NULL; | |
427 | return 0; | |
428 | } | |
429 | ||
430 | static int assess_restrict_namespaces( | |
431 | const struct security_assessor *a, | |
432 | const struct security_info *info, | |
433 | const void *data, | |
434 | uint64_t *ret_badness, | |
435 | char **ret_description) { | |
436 | ||
437 | assert(ret_badness); | |
438 | assert(ret_description); | |
439 | ||
440 | *ret_badness = !!(info->restrict_namespaces & a->parameter); | |
441 | *ret_description = NULL; | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
446 | static int assess_system_call_architectures( | |
447 | const struct security_assessor *a, | |
448 | const struct security_info *info, | |
449 | const void *data, | |
450 | uint64_t *ret_badness, | |
451 | char **ret_description) { | |
452 | ||
453 | char *d; | |
454 | uint64_t b; | |
455 | ||
456 | assert(ret_badness); | |
457 | assert(ret_description); | |
458 | ||
459 | if (strv_isempty(info->system_call_architectures)) { | |
460 | b = 10; | |
461 | d = strdup("Service may execute system calls with all ABIs"); | |
462 | } else if (strv_equal(info->system_call_architectures, STRV_MAKE("native"))) { | |
463 | b = 0; | |
464 | d = strdup("Service may execute system calls only with native ABI"); | |
465 | } else { | |
466 | b = 8; | |
467 | d = strdup("Service may execute system calls with multiple ABIs"); | |
468 | } | |
469 | ||
470 | if (!d) | |
471 | return log_oom(); | |
472 | ||
473 | *ret_badness = b; | |
474 | *ret_description = d; | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | static bool syscall_names_in_filter(Set *s, bool whitelist, const SyscallFilterSet *f) { | |
480 | const char *syscall; | |
481 | ||
482 | NULSTR_FOREACH(syscall, f->value) { | |
483 | bool b; | |
484 | ||
485 | if (syscall[0] == '@') { | |
486 | const SyscallFilterSet *g; | |
487 | assert_se(g = syscall_filter_set_find(syscall)); | |
488 | b = syscall_names_in_filter(s, whitelist, g); | |
489 | } else { | |
490 | #if HAVE_SECCOMP | |
491 | int id; | |
492 | ||
493 | /* Let's see if the system call actually exists on this platform, before complaining */ | |
494 | id = seccomp_syscall_resolve_name(syscall); | |
495 | if (id < 0) | |
496 | continue; | |
497 | #endif | |
498 | ||
499 | b = set_contains(s, syscall); | |
500 | } | |
501 | ||
502 | if (whitelist == b) { | |
503 | log_debug("Offending syscall filter item: %s", syscall); | |
504 | return true; /* bad! */ | |
505 | } | |
506 | } | |
507 | ||
508 | return false; | |
509 | } | |
510 | ||
511 | static int assess_system_call_filter( | |
512 | const struct security_assessor *a, | |
513 | const struct security_info *info, | |
514 | const void *data, | |
515 | uint64_t *ret_badness, | |
516 | char **ret_description) { | |
517 | ||
518 | const SyscallFilterSet *f; | |
519 | char *d = NULL; | |
520 | uint64_t b; | |
521 | ||
522 | assert(a); | |
523 | assert(info); | |
524 | assert(ret_badness); | |
525 | assert(ret_description); | |
526 | ||
527 | assert(a->parameter < _SYSCALL_FILTER_SET_MAX); | |
528 | f = syscall_filter_sets + a->parameter; | |
529 | ||
530 | if (!info->system_call_filter_whitelist && set_isempty(info->system_call_filter)) { | |
531 | d = strdup("Service does not filter system calls"); | |
532 | b = 10; | |
533 | } else { | |
534 | bool bad; | |
535 | ||
536 | log_debug("Analyzing system call filter, checking against: %s", f->name); | |
537 | bad = syscall_names_in_filter(info->system_call_filter, info->system_call_filter_whitelist, f); | |
538 | log_debug("Result: %s", bad ? "bad" : "good"); | |
539 | ||
540 | if (info->system_call_filter_whitelist) { | |
541 | if (bad) { | |
542 | (void) asprintf(&d, "System call whitelist defined for service, and %s is included", f->name); | |
543 | b = 9; | |
544 | } else { | |
545 | (void) asprintf(&d, "System call whitelist defined for service, and %s is not included", f->name); | |
546 | b = 0; | |
547 | } | |
548 | } else { | |
549 | if (bad) { | |
550 | (void) asprintf(&d, "System call blacklist defined for service, and %s is not included", f->name); | |
551 | b = 10; | |
552 | } else { | |
553 | (void) asprintf(&d, "System call blacklist defined for service, and %s is included", f->name); | |
554 | b = 5; | |
555 | } | |
556 | } | |
557 | } | |
558 | ||
559 | if (!d) | |
560 | return log_oom(); | |
561 | ||
562 | *ret_badness = b; | |
563 | *ret_description = d; | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
568 | static int assess_ip_address_allow( | |
569 | const struct security_assessor *a, | |
570 | const struct security_info *info, | |
571 | const void *data, | |
572 | uint64_t *ret_badness, | |
573 | char **ret_description) { | |
574 | ||
575 | char *d = NULL; | |
576 | uint64_t b; | |
577 | ||
578 | assert(info); | |
579 | assert(ret_badness); | |
580 | assert(ret_description); | |
581 | ||
582 | if (!info->ip_address_deny_all) { | |
583 | d = strdup("Service does not define an IP address whitelist"); | |
584 | b = 10; | |
585 | } else if (info->ip_address_allow_other) { | |
586 | d = strdup("Service defines IP address whitelist with non-localhost entries"); | |
587 | b = 5; | |
588 | } else if (info->ip_address_allow_localhost) { | |
589 | d = strdup("Service defines IP address whitelits with only localhost entries"); | |
590 | b = 2; | |
591 | } else { | |
592 | d = strdup("Service blocks all IP address ranges"); | |
593 | b = 0; | |
594 | } | |
595 | ||
596 | if (!d) | |
597 | return log_oom(); | |
598 | ||
599 | *ret_badness = b; | |
600 | *ret_description = d; | |
601 | ||
602 | return 0; | |
603 | } | |
604 | ||
605 | static int assess_device_allow( | |
606 | const struct security_assessor *a, | |
607 | const struct security_info *info, | |
608 | const void *data, | |
609 | uint64_t *ret_badness, | |
610 | char **ret_description) { | |
611 | ||
612 | char *d = NULL; | |
613 | uint64_t b; | |
614 | ||
615 | assert(info); | |
616 | assert(ret_badness); | |
617 | assert(ret_description); | |
618 | ||
619 | if (STRPTR_IN_SET(info->device_policy, "strict", "closed")) { | |
620 | ||
621 | if (info->device_allow_non_empty) { | |
622 | d = strdup("Service has a device ACL with some special devices"); | |
623 | b = 5; | |
624 | } else { | |
625 | d = strdup("Service has a minimal device ACL"); | |
626 | b = 0; | |
627 | } | |
628 | } else { | |
629 | d = strdup("Service has no device ACL"); | |
630 | b = 10; | |
631 | } | |
632 | ||
633 | if (!d) | |
634 | return log_oom(); | |
635 | ||
636 | *ret_badness = b; | |
637 | *ret_description = d; | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | static int assess_ambient_capabilities( | |
643 | const struct security_assessor *a, | |
644 | const struct security_info *info, | |
645 | const void *data, | |
646 | uint64_t *ret_badness, | |
647 | char **ret_description) { | |
648 | ||
649 | assert(ret_badness); | |
650 | assert(ret_description); | |
651 | ||
652 | *ret_badness = info->ambient_capabilities != 0; | |
653 | *ret_description = NULL; | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
658 | static const struct security_assessor security_assessor_table[] = { | |
659 | { | |
660 | .id = "User=/DynamicUser=", | |
661 | .description_bad = "Service runs as root user", | |
662 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#User=", | |
663 | .weight = 2000, | |
664 | .range = 10, | |
665 | .assess = assess_user, | |
666 | }, | |
667 | { | |
668 | .id = "SupplementaryGroups=", | |
669 | .description_good = "Service has no supplementary groups", | |
670 | .description_bad = "Service runs with supplementary groups", | |
671 | .description_na = "Service runs as root, option does not matter", | |
672 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SupplementaryGroups=", | |
673 | .weight = 200, | |
674 | .range = 1, | |
675 | .assess = assess_supplementary_groups, | |
676 | }, | |
677 | { | |
678 | .id = "PrivateDevices=", | |
679 | .description_good = "Service has no access to hardware devices", | |
680 | .description_bad = "Service potentially has access to hardware devices", | |
681 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#PrivateDevices=", | |
682 | .weight = 1000, | |
683 | .range = 1, | |
684 | .assess = assess_bool, | |
685 | .offset = offsetof(struct security_info, private_devices), | |
686 | }, | |
687 | { | |
688 | .id = "PrivateMounts=", | |
689 | .description_good = "Service cannot install system mounts", | |
690 | .description_bad = "Service may install system mounts", | |
691 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#PrivateMounts=", | |
692 | .weight = 1000, | |
693 | .range = 1, | |
694 | .assess = assess_bool, | |
695 | .offset = offsetof(struct security_info, private_mounts), | |
696 | }, | |
697 | { | |
698 | .id = "PrivateNetwork=", | |
699 | .description_good = "Service has no access to the host's network", | |
700 | .description_bad = "Service has access to the host's network", | |
701 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#PrivateNetwork=", | |
702 | .weight = 2500, | |
703 | .range = 1, | |
704 | .assess = assess_bool, | |
705 | .offset = offsetof(struct security_info, private_network), | |
706 | }, | |
707 | { | |
708 | .id = "PrivateTmp=", | |
709 | .description_good = "Service has no access to other software's temporary files", | |
710 | .description_bad = "Service has access to other software's temporary files", | |
711 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#PrivateTmp=", | |
712 | .weight = 1000, | |
713 | .range = 1, | |
714 | .assess = assess_bool, | |
715 | .offset = offsetof(struct security_info, private_tmp), | |
716 | .default_dependencies_only = true, | |
717 | }, | |
718 | { | |
719 | .id = "PrivateUsers=", | |
720 | .description_good = "Service does not have access to other users", | |
721 | .description_bad = "Service has access to other users", | |
722 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#PrivateUsers=", | |
723 | .weight = 1000, | |
724 | .range = 1, | |
725 | .assess = assess_bool, | |
726 | .offset = offsetof(struct security_info, private_users), | |
727 | }, | |
728 | { | |
729 | .id = "ProtectControlGroups=", | |
730 | .description_good = "Service cannot modify the control group file system", | |
731 | .description_bad = "Service may modify to the control group file system", | |
732 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#ProtectControlGroups=", | |
733 | .weight = 1000, | |
734 | .range = 1, | |
735 | .assess = assess_bool, | |
736 | .offset = offsetof(struct security_info, protect_control_groups), | |
737 | }, | |
738 | { | |
739 | .id = "ProtectKernelModules=", | |
740 | .description_good = "Service cannot load or read kernel modules", | |
741 | .description_bad = "Service may load or read kernel modules", | |
742 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#ProtectKernelModules=", | |
743 | .weight = 1000, | |
744 | .range = 1, | |
745 | .assess = assess_bool, | |
746 | .offset = offsetof(struct security_info, protect_kernel_modules), | |
747 | }, | |
748 | { | |
749 | .id = "ProtectKernelTunables=", | |
750 | .description_good = "Service cannot alter kernel tunables (/proc/sys, …)", | |
751 | .description_bad = "Service may alter kernel tunables", | |
752 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#ProtectKernelTunables=", | |
753 | .weight = 1000, | |
754 | .range = 1, | |
755 | .assess = assess_bool, | |
756 | .offset = offsetof(struct security_info, protect_kernel_tunables), | |
757 | }, | |
758 | { | |
759 | .id = "ProtectHome=", | |
760 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#ProtectHome=", | |
761 | .weight = 1000, | |
762 | .range = 10, | |
763 | .assess = assess_protect_home, | |
764 | .default_dependencies_only = true, | |
765 | }, | |
766 | { | |
767 | .id = "ProtectSystem=", | |
768 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#ProtectSystem=", | |
769 | .weight = 1000, | |
770 | .range = 10, | |
771 | .assess = assess_protect_system, | |
772 | .default_dependencies_only = true, | |
773 | }, | |
774 | { | |
775 | .id = "RootDirectory=/RootImage=", | |
776 | .description_good = "Service has its own root directory/image", | |
777 | .description_bad = "Service runs within the host's root directory", | |
778 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RootDirectory=", | |
779 | .weight = 200, | |
780 | .range = 1, | |
781 | .assess = assess_root_directory, | |
782 | .default_dependencies_only = true, | |
783 | }, | |
784 | { | |
785 | .id = "LockPersonality=", | |
786 | .description_good = "Service cannot change ABI personality", | |
787 | .description_bad = "Service may change ABI personality", | |
788 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#LockPersonality=", | |
789 | .weight = 100, | |
790 | .range = 1, | |
791 | .assess = assess_bool, | |
792 | .offset = offsetof(struct security_info, lock_personality), | |
793 | }, | |
794 | { | |
795 | .id = "MemoryDenyWriteExecute=", | |
796 | .description_good = "Service cannot create writable executable memory mappings", | |
797 | .description_bad = "Service may create writable executable memory mappings", | |
798 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#MemoryDenyWriteExecute=", | |
799 | .weight = 100, | |
800 | .range = 1, | |
801 | .assess = assess_bool, | |
802 | .offset = offsetof(struct security_info, memory_deny_write_execute), | |
803 | }, | |
804 | { | |
805 | .id = "NoNewPrivileges=", | |
806 | .description_good = "Service processes cannot acquire new privileges", | |
807 | .description_bad = "Service processes may acquire new privileges", | |
808 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#NoNewPrivileges=", | |
809 | .weight = 1000, | |
810 | .range = 1, | |
811 | .assess = assess_bool, | |
812 | .offset = offsetof(struct security_info, no_new_privileges), | |
813 | }, | |
814 | { | |
815 | .id = "CapabilityBoundingSet=~CAP_SYS_ADMIN", | |
816 | .description_good = "Service has no administrator privileges", | |
817 | .description_bad = "Service has administrator privileges", | |
818 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
819 | .weight = 1500, | |
820 | .range = 1, | |
821 | .assess = assess_capability_bounding_set, | |
822 | .parameter = UINT64_C(1) << CAP_SYS_ADMIN, | |
823 | }, | |
824 | { | |
825 | .id = "CapabilityBoundingSet=~CAP_SET(UID|GID|PCAP)", | |
826 | .description_good = "Service cannot change UID/GID identities/capabilities", | |
827 | .description_bad = "Service may change UID/GID identities/capabilities", | |
828 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
829 | .weight = 1500, | |
830 | .range = 1, | |
831 | .assess = assess_capability_bounding_set, | |
832 | .parameter = (UINT64_C(1) << CAP_SETUID)| | |
833 | (UINT64_C(1) << CAP_SETGID)| | |
834 | (UINT64_C(1) << CAP_SETPCAP), | |
835 | }, | |
836 | { | |
837 | .id = "CapabilityBoundingSet=~CAP_SYS_PTRACE", | |
838 | .description_good = "Service has no ptrace() debugging abilities", | |
839 | .description_bad = "Service has ptrace() debugging abilities", | |
840 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
841 | .weight = 1500, | |
842 | .range = 1, | |
843 | .assess = assess_capability_bounding_set, | |
844 | .parameter = (UINT64_C(1) << CAP_SYS_PTRACE), | |
845 | }, | |
846 | { | |
847 | .id = "CapabilityBoundingSet=~CAP_SYS_TIME", | |
848 | .description_good = "Service processes cannot change the system clock", | |
849 | .description_bad = "Service processes may change the system clock", | |
850 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
851 | .weight = 1000, | |
852 | .range = 1, | |
853 | .assess = assess_capability_bounding_set, | |
854 | .parameter = UINT64_C(1) << CAP_SYS_TIME, | |
855 | }, | |
856 | { | |
857 | .id = "CapabilityBoundingSet=~CAP_NET_ADMIN", | |
858 | .description_good = "Service has no network configuration privileges", | |
859 | .description_bad = "Service has network configuration privileges", | |
860 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
861 | .weight = 1000, | |
862 | .range = 1, | |
863 | .assess = assess_capability_bounding_set, | |
864 | .parameter = (UINT64_C(1) << CAP_NET_ADMIN), | |
865 | }, | |
866 | { | |
867 | .id = "CapabilityBoundingSet=~CAP_RAWIO", | |
868 | .description_good = "Service has no raw I/O access", | |
869 | .description_bad = "Service has raw I/O access", | |
870 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
871 | .weight = 1000, | |
872 | .range = 1, | |
873 | .assess = assess_capability_bounding_set, | |
874 | .parameter = (UINT64_C(1) << CAP_SYS_RAWIO), | |
875 | }, | |
876 | { | |
877 | .id = "CapabilityBoundingSet=~CAP_SYS_MODULE", | |
878 | .description_good = "Service cannot load kernel modules", | |
879 | .description_bad = "Service may load kernel modules", | |
880 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
881 | .weight = 1000, | |
882 | .range = 1, | |
883 | .assess = assess_capability_bounding_set, | |
884 | .parameter = (UINT64_C(1) << CAP_SYS_MODULE), | |
885 | }, | |
886 | { | |
887 | .id = "CapabilityBoundingSet=~CAP_AUDIT_*", | |
888 | .description_good = "Service has no audit subsystem access", | |
889 | .description_bad = "Service has audit subsystem access", | |
890 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
891 | .weight = 500, | |
892 | .range = 1, | |
893 | .assess = assess_capability_bounding_set, | |
894 | .parameter = (UINT64_C(1) << CAP_AUDIT_CONTROL) | | |
895 | (UINT64_C(1) << CAP_AUDIT_READ) | | |
896 | (UINT64_C(1) << CAP_AUDIT_WRITE), | |
897 | }, | |
898 | { | |
899 | .id = "CapabilityBoundingSet=~CAP_SYSLOG", | |
900 | .description_good = "Service has no access to kernel logging", | |
901 | .description_bad = "Service has access to kernel logging", | |
902 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
903 | .weight = 500, | |
904 | .range = 1, | |
905 | .assess = assess_capability_bounding_set, | |
906 | .parameter = (UINT64_C(1) << CAP_SYSLOG), | |
907 | }, | |
908 | { | |
909 | .id = "CapabilityBoundingSet=~CAP_SYS_(NICE|RESOURCE)", | |
910 | .description_good = "Service has no privileges to change resource use parameters", | |
911 | .description_bad = "Service has privileges to change resource use parameters", | |
912 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
913 | .weight = 500, | |
914 | .range = 1, | |
915 | .assess = assess_capability_bounding_set, | |
916 | .parameter = (UINT64_C(1) << CAP_SYS_NICE) | | |
917 | (UINT64_C(1) << CAP_SYS_RESOURCE), | |
918 | }, | |
919 | { | |
920 | .id = "CapabilityBoundingSet=~CAP_MKNOD", | |
921 | .description_good = "Service cannot create device nodes", | |
922 | .description_bad = "Service may create device nodes", | |
923 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
924 | .weight = 500, | |
925 | .range = 1, | |
926 | .assess = assess_capability_bounding_set, | |
927 | .parameter = (UINT64_C(1) << CAP_MKNOD), | |
928 | }, | |
929 | { | |
930 | .id = "CapabilityBoundingSet=~CAP_(CHOWN|FSETID|SETFCAP)", | |
931 | .description_good = "Service cannot change file ownership/access mode/capabilities", | |
932 | .description_bad = "Service may change file ownership/access mode/capabilities unrestricted", | |
933 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
934 | .weight = 1000, | |
935 | .range = 1, | |
936 | .assess = assess_capability_bounding_set, | |
937 | .parameter = (UINT64_C(1) << CAP_CHOWN) | | |
938 | (UINT64_C(1) << CAP_FSETID) | | |
939 | (UINT64_C(1) << CAP_SETFCAP), | |
940 | }, | |
941 | { | |
942 | .id = "CapabilityBoundingSet=~CAP_(DAC_*|FOWNER|IPC_OWNER)", | |
943 | .description_good = "Service cannot override UNIX file/IPC permission checks", | |
944 | .description_bad = "Service may override UNIX file/IPC permission checks", | |
945 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
946 | .weight = 1000, | |
947 | .range = 1, | |
948 | .assess = assess_capability_bounding_set, | |
949 | .parameter = (UINT64_C(1) << CAP_DAC_OVERRIDE) | | |
950 | (UINT64_C(1) << CAP_DAC_READ_SEARCH) | | |
951 | (UINT64_C(1) << CAP_FOWNER) | | |
952 | (UINT64_C(1) << CAP_IPC_OWNER), | |
953 | }, | |
954 | { | |
955 | .id = "CapabilityBoundingSet=~CAP_KILL", | |
956 | .description_good = "Service cannot send UNIX signals to arbitrary processes", | |
957 | .description_bad = "Service may send UNIX signals to arbitrary processes", | |
958 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
959 | .weight = 500, | |
960 | .range = 1, | |
961 | .assess = assess_capability_bounding_set, | |
962 | .parameter = (UINT64_C(1) << CAP_KILL), | |
963 | }, | |
964 | { | |
965 | .id = "CapabilityBoundingSet=~CAP_NET_(BIND_SERVICE|BROADCAST|RAW)", | |
966 | .description_good = "Service has no elevated networking privileges", | |
967 | .description_bad = "Service has elevated networking privileges", | |
968 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
969 | .weight = 500, | |
970 | .range = 1, | |
971 | .assess = assess_capability_bounding_set, | |
972 | .parameter = (UINT64_C(1) << CAP_NET_BIND_SERVICE) | | |
973 | (UINT64_C(1) << CAP_NET_BROADCAST) | | |
974 | (UINT64_C(1) << CAP_NET_RAW), | |
975 | }, | |
976 | { | |
977 | .id = "CapabilityBoundingSet=~CAP_SYS_BOOT", | |
978 | .description_good = "Service cannot issue reboot()", | |
979 | .description_bad = "Service may issue reboot()", | |
980 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
981 | .weight = 100, | |
982 | .range = 1, | |
983 | .assess = assess_capability_bounding_set, | |
984 | .parameter = (UINT64_C(1) << CAP_SYS_BOOT), | |
985 | }, | |
986 | { | |
987 | .id = "CapabilityBoundingSet=~CAP_MAC_*", | |
988 | .description_good = "Service cannot adjust SMACK MAC", | |
989 | .description_bad = "Service may adjust SMACK MAC", | |
990 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
991 | .weight = 100, | |
992 | .range = 1, | |
993 | .assess = assess_capability_bounding_set, | |
994 | .parameter = (UINT64_C(1) << CAP_MAC_ADMIN)| | |
995 | (UINT64_C(1) << CAP_MAC_OVERRIDE), | |
996 | }, | |
997 | { | |
998 | .id = "CapabilityBoundingSet=~CAP_LINUX_IMMUTABLE", | |
999 | .description_good = "Service cannot mark files immutable", | |
1000 | .description_bad = "Service may mark files immutable", | |
1001 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
1002 | .weight = 75, | |
1003 | .range = 1, | |
1004 | .assess = assess_capability_bounding_set, | |
1005 | .parameter = (UINT64_C(1) << CAP_LINUX_IMMUTABLE), | |
1006 | }, | |
1007 | { | |
1008 | .id = "CapabilityBoundingSet=~CAP_IPC_LOCK", | |
1009 | .description_good = "Service cannot lock memory into RAM", | |
1010 | .description_bad = "Service may lock memory into RAM", | |
1011 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
1012 | .weight = 50, | |
1013 | .range = 1, | |
1014 | .assess = assess_capability_bounding_set, | |
1015 | .parameter = (UINT64_C(1) << CAP_IPC_LOCK), | |
1016 | }, | |
1017 | { | |
1018 | .id = "CapabilityBoundingSet=~CAP_SYS_CHROOT", | |
1019 | .description_good = "Service cannot issue chroot()", | |
1020 | .description_bad = "Service may issue chroot()", | |
1021 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
1022 | .weight = 50, | |
1023 | .range = 1, | |
1024 | .assess = assess_capability_bounding_set, | |
1025 | .parameter = (UINT64_C(1) << CAP_SYS_CHROOT), | |
1026 | }, | |
1027 | { | |
1028 | .id = "CapabilityBoundingSet=~CAP_BLOCK_SUSPEND", | |
1029 | .description_good = "Service cannot establish wake locks", | |
1030 | .description_bad = "Service may establish wake locks", | |
1031 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
1032 | .weight = 25, | |
1033 | .range = 1, | |
1034 | .assess = assess_capability_bounding_set, | |
1035 | .parameter = (UINT64_C(1) << CAP_BLOCK_SUSPEND), | |
1036 | }, | |
1037 | { | |
1038 | .id = "CapabilityBoundingSet=~CAP_WAKE_ALARM", | |
1039 | .description_good = "Service cannot program timers that wake up the system", | |
1040 | .description_bad = "Service may program timers that wake up the system", | |
1041 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
1042 | .weight = 25, | |
1043 | .range = 1, | |
1044 | .assess = assess_capability_bounding_set, | |
1045 | .parameter = (UINT64_C(1) << CAP_WAKE_ALARM), | |
1046 | }, | |
1047 | { | |
1048 | .id = "CapabilityBoundingSet=~CAP_LEASE", | |
1049 | .description_good = "Service cannot create file leases", | |
1050 | .description_bad = "Service may create file leases", | |
1051 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
1052 | .weight = 25, | |
1053 | .range = 1, | |
1054 | .assess = assess_capability_bounding_set, | |
1055 | .parameter = (UINT64_C(1) << CAP_LEASE), | |
1056 | }, | |
1057 | { | |
1058 | .id = "CapabilityBoundingSet=~CAP_SYS_TTY_CONFIG", | |
1059 | .description_good = "Service cannot issue vhangup()", | |
1060 | .description_bad = "Service may issue vhangup()", | |
1061 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
1062 | .weight = 25, | |
1063 | .range = 1, | |
1064 | .assess = assess_capability_bounding_set, | |
1065 | .parameter = (UINT64_C(1) << CAP_SYS_TTY_CONFIG), | |
1066 | }, | |
1067 | { | |
1068 | .id = "CapabilityBoundingSet=~CAP_SYS_PACCT", | |
1069 | .description_good = "Service cannot use acct()", | |
1070 | .description_bad = "Service may use acct()", | |
1071 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#CapabilityBoundingSet=", | |
1072 | .weight = 25, | |
1073 | .range = 1, | |
1074 | .assess = assess_capability_bounding_set, | |
1075 | .parameter = (UINT64_C(1) << CAP_SYS_PACCT), | |
1076 | }, | |
1077 | { | |
1078 | .id = "UMask=", | |
1079 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#UMask=", | |
1080 | .weight = 100, | |
1081 | .range = 10, | |
1082 | .assess = assess_umask, | |
1083 | }, | |
1084 | { | |
1085 | .id = "KeyringMode=", | |
1086 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#KeyringMode=", | |
1087 | .description_good = "Service doesn't share key material with other services", | |
1088 | .description_bad = "Service shares key material with other service", | |
1089 | .weight = 1000, | |
1090 | .range = 1, | |
1091 | .assess = assess_keyring_mode, | |
1092 | }, | |
1093 | { | |
1094 | .id = "NotifyAccess=", | |
1095 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#NotifyAccess=", | |
1096 | .description_good = "Service child processes cannot alter service state", | |
1097 | .description_bad = "Service child processes may alter service state", | |
1098 | .weight = 1000, | |
1099 | .range = 1, | |
1100 | .assess = assess_notify_access, | |
1101 | }, | |
1102 | { | |
1103 | .id = "RemoveIPC=", | |
1104 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RemoveIPC=", | |
1105 | .description_good = "Service user cannot leave SysV IPC objects around", | |
1106 | .description_bad = "Service user may leave SysV IPC objects around", | |
1107 | .description_na = "Service runs as root, option does not apply", | |
1108 | .weight = 100, | |
1109 | .range = 1, | |
1110 | .assess = assess_remove_ipc, | |
1111 | .offset = offsetof(struct security_info, remove_ipc), | |
1112 | }, | |
1113 | { | |
1114 | .id = "Delegate=", | |
1115 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#Delegate=", | |
1116 | .description_good = "Service does not maintain its own delegated control group subtree", | |
1117 | .description_bad = "Service maintains its own delegated control group subtree", | |
1118 | .weight = 100, | |
1119 | .range = 1, | |
1120 | .assess = assess_bool, | |
1121 | .offset = offsetof(struct security_info, delegate), | |
1122 | .parameter = true, /* invert! */ | |
1123 | }, | |
1124 | { | |
1125 | .id = "RestrictRealtime=", | |
1126 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictRealtime=", | |
1127 | .description_good = "Service realtime scheduling access is restricted", | |
1128 | .description_bad = "Service may acquire realtime scheduling", | |
1129 | .weight = 500, | |
1130 | .range = 1, | |
1131 | .assess = assess_bool, | |
1132 | .offset = offsetof(struct security_info, restrict_realtime), | |
1133 | }, | |
1134 | { | |
1135 | .id = "RestrictNamespaces=~CLONE_NEWUSER", | |
1136 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictNamespaces=", | |
1137 | .description_good = "Service cannot create user namespaces", | |
1138 | .description_bad = "Service may create user namespaces", | |
1139 | .weight = 1500, | |
1140 | .range = 1, | |
1141 | .assess = assess_restrict_namespaces, | |
1142 | .parameter = CLONE_NEWUSER, | |
1143 | }, | |
1144 | { | |
1145 | .id = "RestrictNamespaces=~CLONE_NEWNS", | |
1146 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictNamespaces=", | |
1147 | .description_good = "Service cannot create file system namespaces", | |
1148 | .description_bad = "Service may create file system namespaces", | |
1149 | .weight = 500, | |
1150 | .range = 1, | |
1151 | .assess = assess_restrict_namespaces, | |
1152 | .parameter = CLONE_NEWNS, | |
1153 | }, | |
1154 | { | |
1155 | .id = "RestrictNamespaces=~CLONE_NEWIPC", | |
1156 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictNamespaces=", | |
1157 | .description_good = "Service cannot create IPC namespaces", | |
1158 | .description_bad = "Service may create IPC namespaces", | |
1159 | .weight = 500, | |
1160 | .range = 1, | |
1161 | .assess = assess_restrict_namespaces, | |
1162 | .parameter = CLONE_NEWIPC, | |
1163 | }, | |
1164 | { | |
1165 | .id = "RestrictNamespaces=~CLONE_NEWPID", | |
1166 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictNamespaces=", | |
1167 | .description_good = "Service cannot create process namespaces", | |
1168 | .description_bad = "Service may create process namespaces", | |
1169 | .weight = 500, | |
1170 | .range = 1, | |
1171 | .assess = assess_restrict_namespaces, | |
1172 | .parameter = CLONE_NEWPID, | |
1173 | }, | |
1174 | { | |
1175 | .id = "RestrictNamespaces=~CLONE_NEWCGROUP", | |
1176 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictNamespaces=", | |
1177 | .description_good = "Service cannot create cgroup namespaces", | |
1178 | .description_bad = "Service may create cgroup namespaces", | |
1179 | .weight = 500, | |
1180 | .range = 1, | |
1181 | .assess = assess_restrict_namespaces, | |
1182 | .parameter = CLONE_NEWCGROUP, | |
1183 | }, | |
1184 | { | |
1185 | .id = "RestrictNamespaces=~CLONE_NEWNET", | |
1186 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictNamespaces=", | |
1187 | .description_good = "Service cannot create network namespaces", | |
1188 | .description_bad = "Service may create network namespaces", | |
1189 | .weight = 500, | |
1190 | .range = 1, | |
1191 | .assess = assess_restrict_namespaces, | |
1192 | .parameter = CLONE_NEWNET, | |
1193 | }, | |
1194 | { | |
1195 | .id = "RestrictNamespaces=~CLONE_NEWUTS", | |
1196 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictNamespaces=", | |
1197 | .description_good = "Service cannot create hostname namespaces", | |
1198 | .description_bad = "Service may create hostname namespaces", | |
1199 | .weight = 100, | |
1200 | .range = 1, | |
1201 | .assess = assess_restrict_namespaces, | |
1202 | .parameter = CLONE_NEWUTS, | |
1203 | }, | |
1204 | { | |
1205 | .id = "RestrictAddressFamilies=~AF_(INET|INET6)", | |
1206 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictAddressFamilies=", | |
1207 | .description_good = "Service cannot allocate Internet sockets", | |
1208 | .description_bad = "Service may allocate Internet sockets", | |
1209 | .weight = 1500, | |
1210 | .range = 1, | |
1211 | .assess = assess_bool, | |
1212 | .offset = offsetof(struct security_info, restrict_address_family_inet), | |
1213 | }, | |
1214 | { | |
1215 | .id = "RestrictAddressFamilies=~AF_UNIX", | |
1216 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictAddressFamilies=", | |
1217 | .description_good = "Service cannot allocate local sockets", | |
1218 | .description_bad = "Service may allocate local sockets", | |
1219 | .weight = 25, | |
1220 | .range = 1, | |
1221 | .assess = assess_bool, | |
1222 | .offset = offsetof(struct security_info, restrict_address_family_unix), | |
1223 | }, | |
1224 | { | |
1225 | .id = "RestrictAddressFamilies=~AF_NETLINK", | |
1226 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictAddressFamilies=", | |
1227 | .description_good = "Service cannot allocate netlink sockets", | |
1228 | .description_bad = "Service may allocate netlink sockets", | |
1229 | .weight = 200, | |
1230 | .range = 1, | |
1231 | .assess = assess_bool, | |
1232 | .offset = offsetof(struct security_info, restrict_address_family_netlink), | |
1233 | }, | |
1234 | { | |
1235 | .id = "RestrictAddressFamilies=~AF_PACKET", | |
1236 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictAddressFamilies=", | |
1237 | .description_good = "Service cannot allocate packet sockets", | |
1238 | .description_bad = "Service may allocate packet sockets", | |
1239 | .weight = 1000, | |
1240 | .range = 1, | |
1241 | .assess = assess_bool, | |
1242 | .offset = offsetof(struct security_info, restrict_address_family_packet), | |
1243 | }, | |
1244 | { | |
1245 | .id = "RestrictAddressFamilies=~…", | |
1246 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#RestrictAddressFamilies=", | |
1247 | .description_good = "Service cannot allocate exotic sockets", | |
1248 | .description_bad = "Service may allocate exotic sockets", | |
1249 | .weight = 1250, | |
1250 | .range = 1, | |
1251 | .assess = assess_bool, | |
1252 | .offset = offsetof(struct security_info, restrict_address_family_other), | |
1253 | }, | |
1254 | { | |
1255 | .id = "SystemCallArchitectures=", | |
1256 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallArchitectures=", | |
1257 | .weight = 1000, | |
1258 | .range = 10, | |
1259 | .assess = assess_system_call_architectures, | |
1260 | }, | |
1261 | { | |
1262 | .id = "SystemCallFilter=~@swap", | |
1263 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1264 | .weight = 1000, | |
1265 | .range = 10, | |
1266 | .assess = assess_system_call_filter, | |
1267 | .parameter = SYSCALL_FILTER_SET_SWAP, | |
1268 | }, | |
1269 | { | |
1270 | .id = "SystemCallFilter=~@obsolete", | |
1271 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1272 | .weight = 250, | |
1273 | .range = 10, | |
1274 | .assess = assess_system_call_filter, | |
1275 | .parameter = SYSCALL_FILTER_SET_OBSOLETE, | |
1276 | }, | |
1277 | { | |
1278 | .id = "SystemCallFilter=~@clock", | |
1279 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1280 | .weight = 1000, | |
1281 | .range = 10, | |
1282 | .assess = assess_system_call_filter, | |
1283 | .parameter = SYSCALL_FILTER_SET_CLOCK, | |
1284 | }, | |
1285 | { | |
1286 | .id = "SystemCallFilter=~@cpu-emulation", | |
1287 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1288 | .weight = 250, | |
1289 | .range = 10, | |
1290 | .assess = assess_system_call_filter, | |
1291 | .parameter = SYSCALL_FILTER_SET_CPU_EMULATION, | |
1292 | }, | |
1293 | { | |
1294 | .id = "SystemCallFilter=~@debug", | |
1295 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1296 | .weight = 1000, | |
1297 | .range = 10, | |
1298 | .assess = assess_system_call_filter, | |
1299 | .parameter = SYSCALL_FILTER_SET_DEBUG, | |
1300 | }, | |
1301 | { | |
1302 | .id = "SystemCallFilter=~@mount", | |
1303 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1304 | .weight = 1000, | |
1305 | .range = 10, | |
1306 | .assess = assess_system_call_filter, | |
1307 | .parameter = SYSCALL_FILTER_SET_MOUNT, | |
1308 | }, | |
1309 | { | |
1310 | .id = "SystemCallFilter=~@module", | |
1311 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1312 | .weight = 1000, | |
1313 | .range = 10, | |
1314 | .assess = assess_system_call_filter, | |
1315 | .parameter = SYSCALL_FILTER_SET_MODULE, | |
1316 | }, | |
1317 | { | |
1318 | .id = "SystemCallFilter=~@raw-io", | |
1319 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1320 | .weight = 1000, | |
1321 | .range = 10, | |
1322 | .assess = assess_system_call_filter, | |
1323 | .parameter = SYSCALL_FILTER_SET_RAW_IO, | |
1324 | }, | |
1325 | { | |
1326 | .id = "SystemCallFilter=~@reboot", | |
1327 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1328 | .weight = 1000, | |
1329 | .range = 10, | |
1330 | .assess = assess_system_call_filter, | |
1331 | .parameter = SYSCALL_FILTER_SET_REBOOT, | |
1332 | }, | |
1333 | { | |
1334 | .id = "SystemCallFilter=~@privileged", | |
1335 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1336 | .weight = 700, | |
1337 | .range = 10, | |
1338 | .assess = assess_system_call_filter, | |
1339 | .parameter = SYSCALL_FILTER_SET_PRIVILEGED, | |
1340 | }, | |
1341 | { | |
1342 | .id = "SystemCallFilter=~@resources", | |
1343 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#SystemCallFilter=", | |
1344 | .weight = 700, | |
1345 | .range = 10, | |
1346 | .assess = assess_system_call_filter, | |
1347 | .parameter = SYSCALL_FILTER_SET_RESOURCES, | |
1348 | }, | |
1349 | { | |
1350 | .id = "IPAddressDeny=", | |
1351 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#IPAddressDeny=", | |
1352 | .weight = 1000, | |
1353 | .range = 10, | |
1354 | .assess = assess_ip_address_allow, | |
1355 | }, | |
1356 | { | |
1357 | .id = "DeviceAllow=", | |
1358 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#DeviceAllow=", | |
1359 | .weight = 1000, | |
1360 | .range = 10, | |
1361 | .assess = assess_device_allow, | |
1362 | }, | |
1363 | { | |
1364 | .id = "AmbientCapabilities=", | |
1365 | .url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#AmbientCapabilities=", | |
1366 | .description_good = "Service process does not receive ambient capabilities", | |
1367 | .description_bad = "Service process receives ambient capabilities", | |
1368 | .weight = 500, | |
1369 | .range = 1, | |
1370 | .assess = assess_ambient_capabilities, | |
1371 | }, | |
1372 | }; | |
1373 | ||
1374 | static int assess(const struct security_info *info, Table *overview_table, AnalyzeSecurityFlags flags) { | |
1375 | static const struct { | |
1376 | uint64_t exposure; | |
1377 | const char *name; | |
1378 | const char *color; | |
1379 | SpecialGlyph smiley; | |
1380 | } badness_table[] = { | |
1381 | { 100, "DANGEROUS", ANSI_HIGHLIGHT_RED, DEPRESSED_SMILEY }, | |
1382 | { 90, "UNSAFE", ANSI_HIGHLIGHT_RED, UNHAPPY_SMILEY }, | |
1383 | { 75, "EXPOSED", ANSI_HIGHLIGHT_YELLOW, SLIGHTLY_UNHAPPY_SMILEY }, | |
1384 | { 50, "MEDIUM", NULL, NEUTRAL_SMILEY }, | |
1385 | { 10, "OK", ANSI_HIGHLIGHT_GREEN, SLIGHTLY_HAPPY_SMILEY }, | |
1386 | { 1, "SAFE", ANSI_HIGHLIGHT_GREEN, HAPPY_SMILEY }, | |
1387 | { 0, "PERFECT", ANSI_HIGHLIGHT_GREEN, ECSTATIC_SMILEY }, | |
1388 | }; | |
1389 | ||
1390 | uint64_t badness_sum = 0, weight_sum = 0, exposure; | |
1391 | _cleanup_(table_unrefp) Table *details_table = NULL; | |
1392 | size_t i; | |
1393 | int r; | |
1394 | ||
1395 | if (!FLAGS_SET(flags, ANALYZE_SECURITY_SHORT)) { | |
1396 | details_table = table_new("", "NAME", "DESCRIPTION", "WEIGHT", "BADNESS", "RANGE", "EXPOSURE"); | |
1397 | if (!details_table) | |
1398 | return log_oom(); | |
1399 | ||
1400 | (void) table_set_sort(details_table, 3, 1, (size_t) -1); | |
1401 | (void) table_set_reverse(details_table, 3, true); | |
1402 | ||
1403 | if (getenv_bool("SYSTEMD_ANALYZE_DEBUG") <= 0) | |
1404 | (void) table_set_display(details_table, 0, 1, 2, 6, (size_t) -1); | |
1405 | } | |
1406 | ||
1407 | for (i = 0; i < ELEMENTSOF(security_assessor_table); i++) { | |
1408 | const struct security_assessor *a = security_assessor_table + i; | |
1409 | _cleanup_free_ char *d = NULL; | |
1410 | uint64_t badness; | |
1411 | void *data; | |
1412 | ||
1413 | data = (uint8_t*) info + a->offset; | |
1414 | ||
1415 | if (a->default_dependencies_only && !info->default_dependencies) { | |
1416 | badness = UINT64_MAX; | |
1417 | d = strdup("Service runs in special boot phase, option does not apply"); | |
1418 | if (!d) | |
1419 | return log_oom(); | |
1420 | } else { | |
1421 | r = a->assess(a, info, data, &badness, &d); | |
1422 | if (r < 0) | |
1423 | return r; | |
1424 | } | |
1425 | ||
1426 | assert(a->range > 0); | |
1427 | ||
1428 | if (badness != UINT64_MAX) { | |
1429 | assert(badness <= a->range); | |
1430 | ||
1431 | badness_sum += DIV_ROUND_UP(badness * a->weight, a->range); | |
1432 | weight_sum += a->weight; | |
1433 | } | |
1434 | ||
1435 | if (details_table) { | |
1436 | const char *checkmark, *description, *color = NULL; | |
1437 | TableCell *cell; | |
1438 | ||
1439 | if (badness == UINT64_MAX) { | |
1440 | checkmark = " "; | |
1441 | description = a->description_na; | |
1442 | color = NULL; | |
1443 | } else if (badness == a->range) { | |
1444 | checkmark = special_glyph(CROSS_MARK); | |
1445 | description = a->description_bad; | |
1446 | color = ansi_highlight_red(); | |
1447 | } else if (badness == 0) { | |
1448 | checkmark = special_glyph(CHECK_MARK); | |
1449 | description = a->description_good; | |
1450 | color = ansi_highlight_green(); | |
1451 | } else { | |
1452 | checkmark = special_glyph(CROSS_MARK); | |
1453 | description = NULL; | |
1454 | color = ansi_highlight_red(); | |
1455 | } | |
1456 | ||
1457 | if (d) | |
1458 | description = d; | |
1459 | ||
1460 | r = table_add_cell_full(details_table, &cell, TABLE_STRING, checkmark, 1, 1, 0, 0, 0); | |
1461 | if (r < 0) | |
1462 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1463 | if (color) | |
1464 | (void) table_set_color(details_table, cell, color); | |
1465 | ||
1466 | r = table_add_cell(details_table, &cell, TABLE_STRING, a->id); | |
1467 | if (r < 0) | |
1468 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1469 | if (a->url) | |
1470 | (void) table_set_url(details_table, cell, a->url); | |
1471 | ||
1472 | r = table_add_cell(details_table, NULL, TABLE_STRING, description); | |
1473 | if (r < 0) | |
1474 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1475 | ||
1476 | r = table_add_cell(details_table, &cell, TABLE_UINT64, &a->weight); | |
1477 | if (r < 0) | |
1478 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1479 | (void) table_set_align_percent(details_table, cell, 100); | |
1480 | ||
1481 | r = table_add_cell(details_table, &cell, TABLE_UINT64, &badness); | |
1482 | if (r < 0) | |
1483 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1484 | (void) table_set_align_percent(details_table, cell, 100); | |
1485 | ||
1486 | r = table_add_cell(details_table, &cell, TABLE_UINT64, &a->range); | |
1487 | if (r < 0) | |
1488 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1489 | (void) table_set_align_percent(details_table, cell, 100); | |
1490 | ||
1491 | r = table_add_cell(details_table, &cell, TABLE_EMPTY, NULL); | |
1492 | if (r < 0) | |
1493 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1494 | (void) table_set_align_percent(details_table, cell, 100); | |
1495 | } | |
1496 | } | |
1497 | ||
1498 | if (details_table) { | |
1499 | size_t row; | |
1500 | ||
1501 | for (row = 1; row < table_get_rows(details_table); row++) { | |
1502 | char buf[DECIMAL_STR_MAX(uint64_t) + 1 + DECIMAL_STR_MAX(uint64_t) + 1]; | |
1503 | const uint64_t *weight, *badness, *range; | |
1504 | TableCell *cell; | |
1505 | uint64_t x; | |
1506 | ||
1507 | assert_se(weight = table_get_at(details_table, row, 3)); | |
1508 | assert_se(badness = table_get_at(details_table, row, 4)); | |
1509 | assert_se(range = table_get_at(details_table, row, 5)); | |
1510 | ||
1511 | if (*badness == UINT64_MAX || *badness == 0) | |
1512 | continue; | |
1513 | ||
1514 | assert_se(cell = table_get_cell(details_table, row, 6)); | |
1515 | ||
1516 | x = DIV_ROUND_UP(DIV_ROUND_UP(*badness * *weight * 100U, *range), weight_sum); | |
1517 | xsprintf(buf, "%" PRIu64 ".%" PRIu64, x / 10, x % 10); | |
1518 | ||
1519 | r = table_update(details_table, cell, TABLE_STRING, buf); | |
1520 | if (r < 0) | |
1521 | return log_error_errno(r, "Failed to update cell in table: %m"); | |
1522 | } | |
1523 | ||
1524 | r = table_print(details_table, stdout); | |
1525 | if (r < 0) | |
1526 | return log_error_errno(r, "Failed to output table: %m"); | |
1527 | } | |
1528 | ||
1529 | exposure = DIV_ROUND_UP(badness_sum * 100U, weight_sum); | |
1530 | ||
1531 | for (i = 0; i < ELEMENTSOF(badness_table); i++) | |
1532 | if (exposure >= badness_table[i].exposure) | |
1533 | break; | |
1534 | ||
1535 | assert(i < ELEMENTSOF(badness_table)); | |
1536 | ||
1537 | if (details_table) { | |
1538 | _cleanup_free_ char *clickable = NULL; | |
1539 | const char *name; | |
1540 | ||
1541 | /* If we shall output the details table, also print the brief summary underneath */ | |
1542 | ||
1543 | if (info->fragment_path) { | |
1544 | r = terminal_urlify_path(info->fragment_path, info->id, &clickable); | |
1545 | if (r < 0) | |
1546 | return log_oom(); | |
1547 | ||
1548 | name = clickable; | |
1549 | } else | |
1550 | name = info->id; | |
1551 | ||
1552 | printf("\n%s %sOverall exposure level for %s%s: %s%" PRIu64 ".%" PRIu64 " %s%s %s\n", | |
1553 | special_glyph(ARROW), | |
1554 | ansi_highlight(), | |
1555 | name, | |
1556 | ansi_normal(), | |
1557 | colors_enabled() ? strempty(badness_table[i].color) : "", | |
1558 | exposure / 10, exposure % 10, | |
1559 | badness_table[i].name, | |
1560 | ansi_normal(), | |
1561 | special_glyph(badness_table[i].smiley)); | |
1562 | } | |
1563 | ||
1564 | fflush(stdout); | |
1565 | ||
1566 | if (overview_table) { | |
1567 | char buf[DECIMAL_STR_MAX(uint64_t) + 1 + DECIMAL_STR_MAX(uint64_t) + 1]; | |
1568 | TableCell *cell; | |
1569 | ||
1570 | r = table_add_cell(overview_table, &cell, TABLE_STRING, info->id); | |
1571 | if (r < 0) | |
1572 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1573 | if (info->fragment_path) { | |
1574 | _cleanup_free_ char *url = NULL; | |
1575 | ||
1576 | r = file_url_from_path(info->fragment_path, &url); | |
1577 | if (r < 0) | |
1578 | return log_error_errno(r, "Failed to generate URL from path: %m"); | |
1579 | ||
1580 | (void) table_set_url(overview_table, cell, url); | |
1581 | } | |
1582 | ||
1583 | xsprintf(buf, "%" PRIu64 ".%" PRIu64, exposure / 10, exposure % 10); | |
1584 | r = table_add_cell(overview_table, &cell, TABLE_STRING, buf); | |
1585 | if (r < 0) | |
1586 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1587 | (void) table_set_align_percent(overview_table, cell, 100); | |
1588 | ||
1589 | r = table_add_cell(overview_table, &cell, TABLE_STRING, badness_table[i].name); | |
1590 | if (r < 0) | |
1591 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1592 | (void) table_set_color(overview_table, cell, strempty(badness_table[i].color)); | |
1593 | ||
1594 | r = table_add_cell(overview_table, NULL, TABLE_STRING, special_glyph(badness_table[i].smiley)); | |
1595 | if (r < 0) | |
1596 | return log_error_errno(r, "Failed to add cell to table: %m"); | |
1597 | } | |
1598 | ||
1599 | return 0; | |
1600 | } | |
1601 | ||
1602 | static int property_read_restrict_address_families( | |
1603 | sd_bus *bus, | |
1604 | const char *member, | |
1605 | sd_bus_message *m, | |
1606 | sd_bus_error *error, | |
1607 | void *userdata) { | |
1608 | ||
1609 | struct security_info *info = userdata; | |
1610 | int whitelist, r; | |
1611 | ||
1612 | assert(bus); | |
1613 | assert(member); | |
1614 | assert(m); | |
1615 | ||
1616 | r = sd_bus_message_enter_container(m, 'r', "bas"); | |
1617 | if (r < 0) | |
1618 | return r; | |
1619 | ||
1620 | r = sd_bus_message_read(m, "b", &whitelist); | |
1621 | if (r < 0) | |
1622 | return r; | |
1623 | ||
1624 | info->restrict_address_family_inet = | |
1625 | info->restrict_address_family_unix = | |
1626 | info->restrict_address_family_netlink = | |
1627 | info->restrict_address_family_packet = | |
1628 | info->restrict_address_family_other = whitelist; | |
1629 | ||
1630 | r = sd_bus_message_enter_container(m, 'a', "s"); | |
1631 | if (r < 0) | |
1632 | return r; | |
1633 | ||
1634 | for (;;) { | |
1635 | const char *name; | |
1636 | ||
1637 | r = sd_bus_message_read(m, "s", &name); | |
1638 | if (r < 0) | |
1639 | return r; | |
1640 | if (r == 0) | |
1641 | break; | |
1642 | ||
1643 | if (STR_IN_SET(name, "AF_INET", "AF_INET6")) | |
1644 | info->restrict_address_family_inet = !whitelist; | |
1645 | else if (streq(name, "AF_UNIX")) | |
1646 | info->restrict_address_family_unix = !whitelist; | |
1647 | else if (streq(name, "AF_NETLINK")) | |
1648 | info->restrict_address_family_netlink = !whitelist; | |
1649 | else if (streq(name, "AF_PACKET")) | |
1650 | info->restrict_address_family_packet = !whitelist; | |
1651 | else | |
1652 | info->restrict_address_family_other = !whitelist; | |
1653 | } | |
1654 | ||
1655 | r = sd_bus_message_exit_container(m); | |
1656 | if (r < 0) | |
1657 | return r; | |
1658 | ||
1659 | return sd_bus_message_exit_container(m); | |
1660 | } | |
1661 | ||
1662 | static int property_read_system_call_filter( | |
1663 | sd_bus *bus, | |
1664 | const char *member, | |
1665 | sd_bus_message *m, | |
1666 | sd_bus_error *error, | |
1667 | void *userdata) { | |
1668 | ||
1669 | struct security_info *info = userdata; | |
1670 | int whitelist, r; | |
1671 | ||
1672 | assert(bus); | |
1673 | assert(member); | |
1674 | assert(m); | |
1675 | ||
1676 | r = sd_bus_message_enter_container(m, 'r', "bas"); | |
1677 | if (r < 0) | |
1678 | return r; | |
1679 | ||
1680 | r = sd_bus_message_read(m, "b", &whitelist); | |
1681 | if (r < 0) | |
1682 | return r; | |
1683 | ||
1684 | info->system_call_filter_whitelist = whitelist; | |
1685 | ||
1686 | r = sd_bus_message_enter_container(m, 'a', "s"); | |
1687 | if (r < 0) | |
1688 | return r; | |
1689 | ||
1690 | for (;;) { | |
1691 | const char *name; | |
1692 | ||
1693 | r = sd_bus_message_read(m, "s", &name); | |
1694 | if (r < 0) | |
1695 | return r; | |
1696 | if (r == 0) | |
1697 | break; | |
1698 | ||
1699 | r = set_ensure_allocated(&info->system_call_filter, &string_hash_ops); | |
1700 | if (r < 0) | |
1701 | return r; | |
1702 | ||
1703 | r = set_put_strdup(info->system_call_filter, name); | |
1704 | if (r < 0) | |
1705 | return r; | |
1706 | } | |
1707 | ||
1708 | r = sd_bus_message_exit_container(m); | |
1709 | if (r < 0) | |
1710 | return r; | |
1711 | ||
1712 | return sd_bus_message_exit_container(m); | |
1713 | } | |
1714 | ||
1715 | static int property_read_ip_address_allow( | |
1716 | sd_bus *bus, | |
1717 | const char *member, | |
1718 | sd_bus_message *m, | |
1719 | sd_bus_error *error, | |
1720 | void *userdata) { | |
1721 | ||
1722 | struct security_info *info = userdata; | |
1723 | bool deny_ipv4 = false, deny_ipv6 = false; | |
1724 | int r; | |
1725 | ||
1726 | assert(bus); | |
1727 | assert(member); | |
1728 | assert(m); | |
1729 | ||
1730 | r = sd_bus_message_enter_container(m, 'a', "(iayu)"); | |
1731 | if (r < 0) | |
1732 | return r; | |
1733 | ||
1734 | for (;;) { | |
1735 | const void *data; | |
1736 | size_t size; | |
1737 | int32_t family; | |
1738 | uint32_t prefixlen; | |
1739 | ||
1740 | r = sd_bus_message_enter_container(m, 'r', "iayu"); | |
1741 | if (r < 0) | |
1742 | return r; | |
1743 | if (r == 0) | |
1744 | break; | |
1745 | ||
1746 | r = sd_bus_message_read(m, "i", &family); | |
1747 | if (r < 0) | |
1748 | return r; | |
1749 | ||
1750 | r = sd_bus_message_read_array(m, 'y', &data, &size); | |
1751 | if (r < 0) | |
1752 | return r; | |
1753 | ||
1754 | r = sd_bus_message_read(m, "u", &prefixlen); | |
1755 | if (r < 0) | |
1756 | return r; | |
1757 | ||
1758 | r = sd_bus_message_exit_container(m); | |
1759 | if (r < 0) | |
1760 | return r; | |
1761 | ||
1762 | if (streq(member, "IPAddressAllow")) { | |
1763 | union in_addr_union u; | |
1764 | ||
1765 | if (family == AF_INET && size == 4 && prefixlen == 8) | |
1766 | memcpy(&u.in, data, size); | |
1767 | else if (family == AF_INET6 && size == 16 && prefixlen == 128) | |
1768 | memcpy(&u.in6, data, size); | |
1769 | else { | |
1770 | info->ip_address_allow_other = true; | |
1771 | continue; | |
1772 | } | |
1773 | ||
1774 | if (in_addr_is_localhost(family, &u)) | |
1775 | info->ip_address_allow_localhost = true; | |
1776 | else | |
1777 | info->ip_address_allow_other = true; | |
1778 | } else { | |
1779 | assert(streq(member, "IPAddressDeny")); | |
1780 | ||
1781 | if (family == AF_INET && size == 4 && prefixlen == 0) | |
1782 | deny_ipv4 = true; | |
1783 | else if (family == AF_INET6 && size == 16 && prefixlen == 0) | |
1784 | deny_ipv6 = true; | |
1785 | } | |
1786 | } | |
1787 | ||
1788 | info->ip_address_deny_all = deny_ipv4 && deny_ipv6; | |
1789 | ||
1790 | return sd_bus_message_exit_container(m); | |
1791 | } | |
1792 | ||
1793 | static int property_read_device_allow( | |
1794 | sd_bus *bus, | |
1795 | const char *member, | |
1796 | sd_bus_message *m, | |
1797 | sd_bus_error *error, | |
1798 | void *userdata) { | |
1799 | ||
1800 | struct security_info *info = userdata; | |
1801 | size_t n = 0; | |
1802 | int r; | |
1803 | ||
1804 | assert(bus); | |
1805 | assert(member); | |
1806 | assert(m); | |
1807 | ||
1808 | r = sd_bus_message_enter_container(m, 'a', "(ss)"); | |
1809 | if (r < 0) | |
1810 | return r; | |
1811 | ||
1812 | for (;;) { | |
1813 | const char *name, *policy; | |
1814 | ||
1815 | r = sd_bus_message_read(m, "(ss)", &name, &policy); | |
1816 | if (r < 0) | |
1817 | return r; | |
1818 | if (r == 0) | |
1819 | break; | |
1820 | ||
1821 | n++; | |
1822 | } | |
1823 | ||
1824 | info->device_allow_non_empty = n > 0; | |
1825 | ||
1826 | return sd_bus_message_exit_container(m); | |
1827 | } | |
1828 | ||
1829 | static int acquire_security_info(sd_bus *bus, const char *name, struct security_info *info, AnalyzeSecurityFlags flags) { | |
1830 | ||
1831 | static const struct bus_properties_map security_map[] = { | |
1832 | { "AmbientCapabilities", "t", NULL, offsetof(struct security_info, ambient_capabilities) }, | |
1833 | { "CapabilityBoundingSet", "t", NULL, offsetof(struct security_info, capability_bounding_set) }, | |
1834 | { "DefaultDependencies", "b", NULL, offsetof(struct security_info, default_dependencies) }, | |
1835 | { "Delegate", "b", NULL, offsetof(struct security_info, delegate) }, | |
1836 | { "DeviceAllow", "a(ss)", property_read_device_allow, 0 }, | |
1837 | { "DevicePolicy", "s", NULL, offsetof(struct security_info, device_policy) }, | |
1838 | { "DynamicUser", "b", NULL, offsetof(struct security_info, dynamic_user) }, | |
1839 | { "FragmentPath", "s", NULL, offsetof(struct security_info, fragment_path) }, | |
1840 | { "IPAddressAllow", "a(iayu)", property_read_ip_address_allow, 0 }, | |
1841 | { "IPAddressDeny", "a(iayu)", property_read_ip_address_allow, 0 }, | |
1842 | { "Id", "s", NULL, offsetof(struct security_info, id) }, | |
1843 | { "KeyringMode", "s", NULL, offsetof(struct security_info, keyring_mode) }, | |
1844 | { "LoadState", "s", NULL, offsetof(struct security_info, load_state) }, | |
1845 | { "LockPersonality", "b", NULL, offsetof(struct security_info, lock_personality) }, | |
1846 | { "MemoryDenyWriteExecute", "b", NULL, offsetof(struct security_info, memory_deny_write_execute) }, | |
1847 | { "NoNewPrivileges", "b", NULL, offsetof(struct security_info, no_new_privileges) }, | |
1848 | { "NotifyAccess", "s", NULL, offsetof(struct security_info, notify_access) }, | |
1849 | { "PrivateDevices", "b", NULL, offsetof(struct security_info, private_devices) }, | |
1850 | { "PrivateMounts", "b", NULL, offsetof(struct security_info, private_mounts) }, | |
1851 | { "PrivateNetwork", "b", NULL, offsetof(struct security_info, private_network) }, | |
1852 | { "PrivateTmp", "b", NULL, offsetof(struct security_info, private_tmp) }, | |
1853 | { "PrivateUsers", "b", NULL, offsetof(struct security_info, private_users) }, | |
1854 | { "PrivateUsers", "b", NULL, offsetof(struct security_info, private_users) }, | |
1855 | { "ProtectControlGroups", "b", NULL, offsetof(struct security_info, protect_control_groups) }, | |
1856 | { "ProtectHome", "s", NULL, offsetof(struct security_info, protect_home) }, | |
1857 | { "ProtectKernelModules", "b", NULL, offsetof(struct security_info, protect_kernel_modules) }, | |
1858 | { "ProtectKernelTunables", "b", NULL, offsetof(struct security_info, protect_kernel_tunables) }, | |
1859 | { "ProtectSystem", "s", NULL, offsetof(struct security_info, protect_system) }, | |
1860 | { "RemoveIPC", "b", NULL, offsetof(struct security_info, remove_ipc) }, | |
1861 | { "RestrictAddressFamilies", "(bas)", property_read_restrict_address_families, 0 }, | |
1862 | { "RestrictNamespaces", "t", NULL, offsetof(struct security_info, restrict_namespaces) }, | |
1863 | { "RestrictRealtime", "b", NULL, offsetof(struct security_info, restrict_realtime) }, | |
1864 | { "RootDirectory", "s", NULL, offsetof(struct security_info, root_directory) }, | |
1865 | { "RootImage", "s", NULL, offsetof(struct security_info, root_image) }, | |
1866 | { "SupplementaryGroups", "as", NULL, offsetof(struct security_info, supplementary_groups) }, | |
1867 | { "SystemCallArchitectures", "as", NULL, offsetof(struct security_info, system_call_architectures) }, | |
1868 | { "SystemCallFilter", "(as)", property_read_system_call_filter, 0 }, | |
1869 | { "Type", "s", NULL, offsetof(struct security_info, type) }, | |
1870 | { "UMask", "u", NULL, offsetof(struct security_info, _umask) }, | |
1871 | { "User", "s", NULL, offsetof(struct security_info, user) }, | |
1872 | {} | |
1873 | }; | |
1874 | ||
1875 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1876 | _cleanup_free_ char *path = NULL; | |
1877 | int r; | |
1878 | ||
1879 | /* Note: this mangles *info on failure! */ | |
1880 | ||
1881 | assert(bus); | |
1882 | assert(name); | |
1883 | assert(info); | |
1884 | ||
1885 | path = unit_dbus_path_from_name(name); | |
1886 | if (!path) | |
1887 | return log_oom(); | |
1888 | ||
1889 | r = bus_map_all_properties(bus, | |
1890 | "org.freedesktop.systemd1", | |
1891 | path, | |
1892 | security_map, | |
1893 | BUS_MAP_STRDUP|BUS_MAP_BOOLEAN_AS_BOOL, | |
1894 | &error, | |
1895 | NULL, | |
1896 | info); | |
1897 | if (r < 0) | |
1898 | return log_error_errno(r, "Failed to get unit properties: %s", bus_error_message(&error, r)); | |
1899 | ||
1900 | if (!streq_ptr(info->load_state, "loaded")) { | |
1901 | ||
1902 | if (FLAGS_SET(flags, ANALYZE_SECURITY_ONLY_LOADED)) | |
1903 | return -EMEDIUMTYPE; | |
1904 | ||
1905 | if (streq_ptr(info->load_state, "not-found")) | |
1906 | log_error("Unit %s not found, cannot analyze.", name); | |
1907 | else if (streq_ptr(info->load_state, "masked")) | |
1908 | log_error("Unit %s is masked, cannot analyze.", name); | |
1909 | else | |
1910 | log_error("Unit %s not loaded properly, cannot analyze.", name); | |
1911 | ||
1912 | return -EINVAL; | |
1913 | } | |
1914 | ||
1915 | if (FLAGS_SET(flags, ANALYZE_SECURITY_ONLY_LONG_RUNNING) && streq_ptr(info->type, "oneshot")) | |
1916 | return -EMEDIUMTYPE; | |
1917 | ||
1918 | if (info->private_devices || | |
1919 | info->private_tmp || | |
1920 | info->protect_control_groups || | |
1921 | info->protect_kernel_tunables || | |
1922 | info->protect_kernel_modules || | |
1923 | !streq_ptr(info->protect_home, "no") || | |
1924 | !streq_ptr(info->protect_system, "no") || | |
1925 | info->root_image) | |
1926 | info->private_mounts = true; | |
1927 | ||
1928 | if (info->protect_kernel_modules) | |
1929 | info->capability_bounding_set &= ~(UINT64_C(1) << CAP_SYS_MODULE); | |
1930 | ||
1931 | if (info->private_devices) | |
1932 | info->capability_bounding_set &= ~((UINT64_C(1) << CAP_MKNOD) | | |
1933 | (UINT64_C(1) << CAP_SYS_RAWIO)); | |
1934 | ||
1935 | return 0; | |
1936 | } | |
1937 | ||
1938 | static int analyze_security_one(sd_bus *bus, const char *name, Table* overview_table, AnalyzeSecurityFlags flags) { | |
1939 | _cleanup_(security_info_free) struct security_info info = { | |
1940 | .default_dependencies = true, | |
1941 | .capability_bounding_set = UINT64_MAX, | |
1942 | .restrict_namespaces = UINT64_MAX, | |
1943 | ._umask = 0002, | |
1944 | }; | |
1945 | int r; | |
1946 | ||
1947 | assert(bus); | |
1948 | assert(name); | |
1949 | ||
1950 | r = acquire_security_info(bus, name, &info, flags); | |
1951 | if (r == -EMEDIUMTYPE) /* Ignore this one because not loaded or Type is oneshot */ | |
1952 | return 0; | |
1953 | if (r < 0) | |
1954 | return r; | |
1955 | ||
1956 | r = assess(&info, overview_table, flags); | |
1957 | if (r < 0) | |
1958 | return r; | |
1959 | ||
1960 | return 0; | |
1961 | } | |
1962 | ||
1963 | int analyze_security(sd_bus *bus, char **units, AnalyzeSecurityFlags flags) { | |
1964 | _cleanup_(table_unrefp) Table *overview_table = NULL; | |
1965 | int ret = 0, r; | |
1966 | ||
1967 | assert(bus); | |
1968 | ||
1969 | if (strv_length(units) != 1) { | |
1970 | overview_table = table_new("UNIT", "EXPOSURE", "PREDICATE", "HAPPY"); | |
1971 | if (!overview_table) | |
1972 | return log_oom(); | |
1973 | } | |
1974 | ||
1975 | if (strv_isempty(units)) { | |
1976 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1977 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; | |
1978 | _cleanup_strv_free_ char **list = NULL; | |
1979 | size_t allocated = 0, n = 0; | |
1980 | char **i; | |
1981 | ||
1982 | r = sd_bus_call_method( | |
1983 | bus, | |
1984 | "org.freedesktop.systemd1", | |
1985 | "/org/freedesktop/systemd1", | |
1986 | "org.freedesktop.systemd1.Manager", | |
1987 | "ListUnits", | |
1988 | &error, &reply, | |
1989 | NULL); | |
1990 | if (r < 0) | |
1991 | return log_error_errno(r, "Failed to list units: %s", bus_error_message(&error, r)); | |
1992 | ||
1993 | r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssssouso)"); | |
1994 | if (r < 0) | |
1995 | return bus_log_parse_error(r); | |
1996 | ||
1997 | for (;;) { | |
1998 | UnitInfo info; | |
1999 | char *copy = NULL; | |
2000 | ||
2001 | r = bus_parse_unit_info(reply, &info); | |
2002 | if (r < 0) | |
2003 | return bus_log_parse_error(r); | |
2004 | if (r == 0) | |
2005 | break; | |
2006 | ||
2007 | if (!endswith(info.id, ".service")) | |
2008 | continue; | |
2009 | ||
2010 | if (!GREEDY_REALLOC(list, allocated, n+2)) | |
2011 | return log_oom(); | |
2012 | ||
2013 | copy = strdup(info.id); | |
2014 | if (!copy) | |
2015 | return log_oom(); | |
2016 | ||
2017 | list[n++] = copy; | |
2018 | list[n] = NULL; | |
2019 | } | |
2020 | ||
2021 | strv_sort(list); | |
2022 | ||
2023 | flags |= ANALYZE_SECURITY_SHORT|ANALYZE_SECURITY_ONLY_LOADED|ANALYZE_SECURITY_ONLY_LONG_RUNNING; | |
2024 | ||
2025 | STRV_FOREACH(i, list) { | |
2026 | r = analyze_security_one(bus, *i, overview_table, flags); | |
2027 | if (r < 0 && ret >= 0) | |
2028 | ret = r; | |
2029 | } | |
2030 | ||
2031 | } else { | |
2032 | char **i; | |
2033 | ||
2034 | STRV_FOREACH(i, units) { | |
2035 | _cleanup_free_ char *mangled = NULL, *instance = NULL; | |
2036 | const char *name; | |
2037 | ||
2038 | if (!FLAGS_SET(flags, ANALYZE_SECURITY_SHORT) && i != units) { | |
2039 | putc('\n', stdout); | |
2040 | fflush(stdout); | |
2041 | } | |
2042 | ||
2043 | r = unit_name_mangle_with_suffix(*i, 0, ".service", &mangled); | |
2044 | if (r < 0) | |
2045 | return log_error_errno(r, "Failed to mangle unit name '%s': %m", *i); | |
2046 | ||
2047 | if (!endswith(mangled, ".service")) { | |
2048 | log_error("Unit %s is not a service unit, refusing.", *i); | |
2049 | return -EINVAL; | |
2050 | } | |
2051 | ||
2052 | if (unit_name_is_valid(mangled, UNIT_NAME_TEMPLATE)) { | |
2053 | r = unit_name_replace_instance(mangled, "test-instance", &instance); | |
2054 | if (r < 0) | |
2055 | return log_oom(); | |
2056 | ||
2057 | name = instance; | |
2058 | } else | |
2059 | name = mangled; | |
2060 | ||
2061 | r = analyze_security_one(bus, name, overview_table, flags); | |
2062 | if (r < 0 && ret >= 0) | |
2063 | ret = r; | |
2064 | } | |
2065 | } | |
2066 | ||
2067 | if (overview_table) { | |
2068 | if (!FLAGS_SET(flags, ANALYZE_SECURITY_SHORT)) { | |
2069 | putc('\n', stdout); | |
2070 | fflush(stdout); | |
2071 | } | |
2072 | ||
2073 | r = table_print(overview_table, stdout); | |
2074 | if (r < 0) | |
2075 | return log_error_errno(r, "Failed to output table: %m"); | |
2076 | } | |
2077 | ||
2078 | return ret; | |
2079 | } |