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15#include <linux/lsm_hooks.h>
16#include <linux/moduleparam.h>
17#include <linux/mm.h>
18#include <linux/mman.h>
19#include <linux/mount.h>
20#include <linux/namei.h>
21#include <linux/ptrace.h>
22#include <linux/ctype.h>
23#include <linux/sysctl.h>
24#include <linux/audit.h>
25#include <linux/user_namespace.h>
26#include <net/sock.h>
27
28#include "include/apparmor.h"
29#include "include/apparmorfs.h"
30#include "include/audit.h"
31#include "include/capability.h"
32#include "include/cred.h"
33#include "include/file.h"
34#include "include/ipc.h"
35#include "include/net.h"
36#include "include/path.h"
37#include "include/label.h"
38#include "include/policy.h"
39#include "include/policy_ns.h"
40#include "include/procattr.h"
41#include "include/mount.h"
42
43
44int apparmor_initialized;
45
46DEFINE_PER_CPU(struct aa_buffers, aa_buffers);
47
48
49
50
51
52
53
54
55
56static void apparmor_cred_free(struct cred *cred)
57{
58 aa_put_label(cred_label(cred));
59 cred_label(cred) = NULL;
60}
61
62
63
64
65static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
66{
67 cred_label(cred) = NULL;
68 return 0;
69}
70
71
72
73
74static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
75 gfp_t gfp)
76{
77 cred_label(new) = aa_get_newest_label(cred_label(old));
78 return 0;
79}
80
81
82
83
84static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
85{
86 cred_label(new) = aa_get_newest_label(cred_label(old));
87}
88
89static void apparmor_task_free(struct task_struct *task)
90{
91
92 aa_free_task_ctx(task_ctx(task));
93 task_ctx(task) = NULL;
94}
95
96static int apparmor_task_alloc(struct task_struct *task,
97 unsigned long clone_flags)
98{
99 struct aa_task_ctx *new = aa_alloc_task_ctx(GFP_KERNEL);
100
101 if (!new)
102 return -ENOMEM;
103
104 aa_dup_task_ctx(new, task_ctx(current));
105 task_ctx(task) = new;
106
107 return 0;
108}
109
110static int apparmor_ptrace_access_check(struct task_struct *child,
111 unsigned int mode)
112{
113 struct aa_label *tracer, *tracee;
114 int error;
115
116 tracer = begin_current_label_crit_section();
117 tracee = aa_get_task_label(child);
118 error = aa_may_ptrace(tracer, tracee,
119 mode == PTRACE_MODE_READ ? AA_PTRACE_READ : AA_PTRACE_TRACE);
120 aa_put_label(tracee);
121 end_current_label_crit_section(tracer);
122
123 return error;
124}
125
126static int apparmor_ptrace_traceme(struct task_struct *parent)
127{
128 struct aa_label *tracer, *tracee;
129 int error;
130
131 tracee = begin_current_label_crit_section();
132 tracer = aa_get_task_label(parent);
133 error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE);
134 aa_put_label(tracer);
135 end_current_label_crit_section(tracee);
136
137 return error;
138}
139
140
141static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
142 kernel_cap_t *inheritable, kernel_cap_t *permitted)
143{
144 struct aa_label *label;
145 const struct cred *cred;
146
147 rcu_read_lock();
148 cred = __task_cred(target);
149 label = aa_get_newest_cred_label(cred);
150
151
152
153
154
155 if (!unconfined(label)) {
156 struct aa_profile *profile;
157 struct label_it i;
158
159 label_for_each_confined(i, label, profile) {
160 if (COMPLAIN_MODE(profile))
161 continue;
162 *effective = cap_intersect(*effective,
163 profile->caps.allow);
164 *permitted = cap_intersect(*permitted,
165 profile->caps.allow);
166 }
167 }
168 rcu_read_unlock();
169 aa_put_label(label);
170
171 return 0;
172}
173
174static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
175 int cap, int audit)
176{
177 struct aa_label *label;
178 int error = 0;
179
180 label = aa_get_newest_cred_label(cred);
181 if (!unconfined(label))
182 error = aa_capable(label, cap, audit);
183 aa_put_label(label);
184
185 return error;
186}
187
188
189
190
191
192
193
194
195
196
197static int common_perm(const char *op, const struct path *path, u32 mask,
198 struct path_cond *cond)
199{
200 struct aa_label *label;
201 int error = 0;
202
203 label = __begin_current_label_crit_section();
204 if (!unconfined(label))
205 error = aa_path_perm(op, label, path, 0, mask, cond);
206 __end_current_label_crit_section(label);
207
208 return error;
209}
210
211
212
213
214
215
216
217
218
219static int common_perm_cond(const char *op, const struct path *path, u32 mask)
220{
221 struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
222 d_backing_inode(path->dentry)->i_mode
223 };
224
225 if (!path_mediated_fs(path->dentry))
226 return 0;
227
228 return common_perm(op, path, mask, &cond);
229}
230
231
232
233
234
235
236
237
238
239
240
241static int common_perm_dir_dentry(const char *op, const struct path *dir,
242 struct dentry *dentry, u32 mask,
243 struct path_cond *cond)
244{
245 struct path path = { .mnt = dir->mnt, .dentry = dentry };
246
247 return common_perm(op, &path, mask, cond);
248}
249
250
251
252
253
254
255
256
257
258
259static int common_perm_rm(const char *op, const struct path *dir,
260 struct dentry *dentry, u32 mask)
261{
262 struct inode *inode = d_backing_inode(dentry);
263 struct path_cond cond = { };
264
265 if (!inode || !path_mediated_fs(dentry))
266 return 0;
267
268 cond.uid = inode->i_uid;
269 cond.mode = inode->i_mode;
270
271 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
272}
273
274
275
276
277
278
279
280
281
282
283
284static int common_perm_create(const char *op, const struct path *dir,
285 struct dentry *dentry, u32 mask, umode_t mode)
286{
287 struct path_cond cond = { current_fsuid(), mode };
288
289 if (!path_mediated_fs(dir->dentry))
290 return 0;
291
292 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
293}
294
295static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry)
296{
297 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
298}
299
300static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry,
301 umode_t mode)
302{
303 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
304 S_IFDIR);
305}
306
307static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry)
308{
309 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
310}
311
312static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry,
313 umode_t mode, unsigned int dev)
314{
315 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
316}
317
318static int apparmor_path_truncate(const struct path *path)
319{
320 return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR);
321}
322
323static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
324 const char *old_name)
325{
326 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
327 S_IFLNK);
328}
329
330static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir,
331 struct dentry *new_dentry)
332{
333 struct aa_label *label;
334 int error = 0;
335
336 if (!path_mediated_fs(old_dentry))
337 return 0;
338
339 label = begin_current_label_crit_section();
340 if (!unconfined(label))
341 error = aa_path_link(label, old_dentry, new_dir, new_dentry);
342 end_current_label_crit_section(label);
343
344 return error;
345}
346
347static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
348 const struct path *new_dir, struct dentry *new_dentry)
349{
350 struct aa_label *label;
351 int error = 0;
352
353 if (!path_mediated_fs(old_dentry))
354 return 0;
355
356 label = begin_current_label_crit_section();
357 if (!unconfined(label)) {
358 struct path old_path = { .mnt = old_dir->mnt,
359 .dentry = old_dentry };
360 struct path new_path = { .mnt = new_dir->mnt,
361 .dentry = new_dentry };
362 struct path_cond cond = { d_backing_inode(old_dentry)->i_uid,
363 d_backing_inode(old_dentry)->i_mode
364 };
365
366 error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
367 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
368 AA_MAY_SETATTR | AA_MAY_DELETE,
369 &cond);
370 if (!error)
371 error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
372 0, MAY_WRITE | AA_MAY_SETATTR |
373 AA_MAY_CREATE, &cond);
374
375 }
376 end_current_label_crit_section(label);
377
378 return error;
379}
380
381static int apparmor_path_chmod(const struct path *path, umode_t mode)
382{
383 return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
384}
385
386static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
387{
388 return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
389}
390
391static int apparmor_inode_getattr(const struct path *path)
392{
393 return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
394}
395
396static int apparmor_file_open(struct file *file, const struct cred *cred)
397{
398 struct aa_file_ctx *fctx = file_ctx(file);
399 struct aa_label *label;
400 int error = 0;
401
402 if (!path_mediated_fs(file->f_path.dentry))
403 return 0;
404
405
406
407
408
409
410 if (current->in_execve) {
411 fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
412 return 0;
413 }
414
415 label = aa_get_newest_cred_label(cred);
416 if (!unconfined(label)) {
417 struct inode *inode = file_inode(file);
418 struct path_cond cond = { inode->i_uid, inode->i_mode };
419
420 error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
421 aa_map_file_to_perms(file), &cond);
422
423 fctx->allow = aa_map_file_to_perms(file);
424 }
425 aa_put_label(label);
426
427 return error;
428}
429
430static int apparmor_file_alloc_security(struct file *file)
431{
432 int error = 0;
433
434
435 struct aa_label *label = begin_current_label_crit_section();
436 file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL);
437 if (!file_ctx(file))
438 error = -ENOMEM;
439 end_current_label_crit_section(label);
440
441 return error;
442}
443
444static void apparmor_file_free_security(struct file *file)
445{
446 aa_free_file_ctx(file_ctx(file));
447}
448
449static int common_file_perm(const char *op, struct file *file, u32 mask)
450{
451 struct aa_label *label;
452 int error = 0;
453
454
455 if (file->f_path.dentry == aa_null.dentry)
456 return -EACCES;
457
458 label = __begin_current_label_crit_section();
459 error = aa_file_perm(op, label, file, mask);
460 __end_current_label_crit_section(label);
461
462 return error;
463}
464
465static int apparmor_file_receive(struct file *file)
466{
467 return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file));
468}
469
470static int apparmor_file_permission(struct file *file, int mask)
471{
472 return common_file_perm(OP_FPERM, file, mask);
473}
474
475static int apparmor_file_lock(struct file *file, unsigned int cmd)
476{
477 u32 mask = AA_MAY_LOCK;
478
479 if (cmd == F_WRLCK)
480 mask |= MAY_WRITE;
481
482 return common_file_perm(OP_FLOCK, file, mask);
483}
484
485static int common_mmap(const char *op, struct file *file, unsigned long prot,
486 unsigned long flags)
487{
488 int mask = 0;
489
490 if (!file || !file_ctx(file))
491 return 0;
492
493 if (prot & PROT_READ)
494 mask |= MAY_READ;
495
496
497
498
499 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
500 mask |= MAY_WRITE;
501 if (prot & PROT_EXEC)
502 mask |= AA_EXEC_MMAP;
503
504 return common_file_perm(op, file, mask);
505}
506
507static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
508 unsigned long prot, unsigned long flags)
509{
510 return common_mmap(OP_FMMAP, file, prot, flags);
511}
512
513static int apparmor_file_mprotect(struct vm_area_struct *vma,
514 unsigned long reqprot, unsigned long prot)
515{
516 return common_mmap(OP_FMPROT, vma->vm_file, prot,
517 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
518}
519
520static int apparmor_sb_mount(const char *dev_name, const struct path *path,
521 const char *type, unsigned long flags, void *data)
522{
523 struct aa_label *label;
524 int error = 0;
525
526
527 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
528 flags &= ~MS_MGC_MSK;
529
530 flags &= ~AA_MS_IGNORE_MASK;
531
532 label = __begin_current_label_crit_section();
533 if (!unconfined(label)) {
534 if (flags & MS_REMOUNT)
535 error = aa_remount(label, path, flags, data);
536 else if (flags & MS_BIND)
537 error = aa_bind_mount(label, path, dev_name, flags);
538 else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
539 MS_UNBINDABLE))
540 error = aa_mount_change_type(label, path, flags);
541 else if (flags & MS_MOVE)
542 error = aa_move_mount(label, path, dev_name);
543 else
544 error = aa_new_mount(label, dev_name, path, type,
545 flags, data);
546 }
547 __end_current_label_crit_section(label);
548
549 return error;
550}
551
552static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
553{
554 struct aa_label *label;
555 int error = 0;
556
557 label = __begin_current_label_crit_section();
558 if (!unconfined(label))
559 error = aa_umount(label, mnt, flags);
560 __end_current_label_crit_section(label);
561
562 return error;
563}
564
565static int apparmor_sb_pivotroot(const struct path *old_path,
566 const struct path *new_path)
567{
568 struct aa_label *label;
569 int error = 0;
570
571 label = aa_get_current_label();
572 if (!unconfined(label))
573 error = aa_pivotroot(label, old_path, new_path);
574 aa_put_label(label);
575
576 return error;
577}
578
579static int apparmor_getprocattr(struct task_struct *task, char *name,
580 char **value)
581{
582 int error = -ENOENT;
583
584 const struct cred *cred = get_task_cred(task);
585 struct aa_task_ctx *ctx = task_ctx(current);
586 struct aa_label *label = NULL;
587
588 if (strcmp(name, "current") == 0)
589 label = aa_get_newest_label(cred_label(cred));
590 else if (strcmp(name, "prev") == 0 && ctx->previous)
591 label = aa_get_newest_label(ctx->previous);
592 else if (strcmp(name, "exec") == 0 && ctx->onexec)
593 label = aa_get_newest_label(ctx->onexec);
594 else
595 error = -EINVAL;
596
597 if (label)
598 error = aa_getprocattr(label, value);
599
600 aa_put_label(label);
601 put_cred(cred);
602
603 return error;
604}
605
606static int apparmor_setprocattr(const char *name, void *value,
607 size_t size)
608{
609 char *command, *largs = NULL, *args = value;
610 size_t arg_size;
611 int error;
612 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR);
613
614 if (size == 0)
615 return -EINVAL;
616
617
618 if (args[size - 1] != '\0') {
619
620 largs = args = kmalloc(size + 1, GFP_KERNEL);
621 if (!args)
622 return -ENOMEM;
623 memcpy(args, value, size);
624 args[size] = '\0';
625 }
626
627 error = -EINVAL;
628 args = strim(args);
629 command = strsep(&args, " ");
630 if (!args)
631 goto out;
632 args = skip_spaces(args);
633 if (!*args)
634 goto out;
635
636 arg_size = size - (args - (largs ? largs : (char *) value));
637 if (strcmp(name, "current") == 0) {
638 if (strcmp(command, "changehat") == 0) {
639 error = aa_setprocattr_changehat(args, arg_size,
640 AA_CHANGE_NOFLAGS);
641 } else if (strcmp(command, "permhat") == 0) {
642 error = aa_setprocattr_changehat(args, arg_size,
643 AA_CHANGE_TEST);
644 } else if (strcmp(command, "changeprofile") == 0) {
645 error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
646 } else if (strcmp(command, "permprofile") == 0) {
647 error = aa_change_profile(args, AA_CHANGE_TEST);
648 } else if (strcmp(command, "stack") == 0) {
649 error = aa_change_profile(args, AA_CHANGE_STACK);
650 } else
651 goto fail;
652 } else if (strcmp(name, "exec") == 0) {
653 if (strcmp(command, "exec") == 0)
654 error = aa_change_profile(args, AA_CHANGE_ONEXEC);
655 else if (strcmp(command, "stack") == 0)
656 error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
657 AA_CHANGE_STACK));
658 else
659 goto fail;
660 } else
661
662 goto fail;
663
664 if (!error)
665 error = size;
666out:
667 kfree(largs);
668 return error;
669
670fail:
671 aad(&sa)->label = begin_current_label_crit_section();
672 aad(&sa)->info = name;
673 aad(&sa)->error = error = -EINVAL;
674 aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
675 end_current_label_crit_section(aad(&sa)->label);
676 goto out;
677}
678
679
680
681
682
683static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
684{
685 struct aa_label *label = aa_current_raw_label();
686 struct aa_label *new_label = cred_label(bprm->cred);
687
688
689 if ((new_label->proxy == label->proxy) ||
690 (unconfined(new_label)))
691 return;
692
693 aa_inherit_files(bprm->cred, current->files);
694
695 current->pdeath_signal = 0;
696
697
698 __aa_transition_rlimits(label, new_label);
699}
700
701
702
703
704
705static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
706{
707
708 aa_clear_task_ctx_trans(task_ctx(current));
709
710 return;
711}
712
713static int apparmor_task_setrlimit(struct task_struct *task,
714 unsigned int resource, struct rlimit *new_rlim)
715{
716 struct aa_label *label = __begin_current_label_crit_section();
717 int error = 0;
718
719 if (!unconfined(label))
720 error = aa_task_setrlimit(label, task, resource, new_rlim);
721 __end_current_label_crit_section(label);
722
723 return error;
724}
725
726static int apparmor_task_kill(struct task_struct *target, struct siginfo *info,
727 int sig, const struct cred *cred)
728{
729 struct aa_label *cl, *tl;
730 int error;
731
732 if (cred) {
733
734
735
736 cl = aa_get_newest_cred_label(cred);
737 tl = aa_get_task_label(target);
738 error = aa_may_signal(cl, tl, sig);
739 aa_put_label(cl);
740 aa_put_label(tl);
741 return error;
742 }
743
744 cl = __begin_current_label_crit_section();
745 tl = aa_get_task_label(target);
746 error = aa_may_signal(cl, tl, sig);
747 aa_put_label(tl);
748 __end_current_label_crit_section(cl);
749
750 return error;
751}
752
753
754
755
756static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
757{
758 struct aa_sk_ctx *ctx;
759
760 ctx = kzalloc(sizeof(*ctx), flags);
761 if (!ctx)
762 return -ENOMEM;
763
764 SK_CTX(sk) = ctx;
765
766 return 0;
767}
768
769
770
771
772static void apparmor_sk_free_security(struct sock *sk)
773{
774 struct aa_sk_ctx *ctx = SK_CTX(sk);
775
776 SK_CTX(sk) = NULL;
777 aa_put_label(ctx->label);
778 aa_put_label(ctx->peer);
779 kfree(ctx);
780}
781
782
783
784
785static void apparmor_sk_clone_security(const struct sock *sk,
786 struct sock *newsk)
787{
788 struct aa_sk_ctx *ctx = SK_CTX(sk);
789 struct aa_sk_ctx *new = SK_CTX(newsk);
790
791 new->label = aa_get_label(ctx->label);
792 new->peer = aa_get_label(ctx->peer);
793}
794
795
796
797
798static int apparmor_socket_create(int family, int type, int protocol, int kern)
799{
800 struct aa_label *label;
801 int error = 0;
802
803 AA_BUG(in_interrupt());
804
805 label = begin_current_label_crit_section();
806 if (!(kern || unconfined(label)))
807 error = af_select(family,
808 create_perm(label, family, type, protocol),
809 aa_af_perm(label, OP_CREATE, AA_MAY_CREATE,
810 family, type, protocol));
811 end_current_label_crit_section(label);
812
813 return error;
814}
815
816
817
818
819
820
821
822
823
824
825
826static int apparmor_socket_post_create(struct socket *sock, int family,
827 int type, int protocol, int kern)
828{
829 struct aa_label *label;
830
831 if (kern) {
832 struct aa_ns *ns = aa_get_current_ns();
833
834 label = aa_get_label(ns_unconfined(ns));
835 aa_put_ns(ns);
836 } else
837 label = aa_get_current_label();
838
839 if (sock->sk) {
840 struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
841
842 aa_put_label(ctx->label);
843 ctx->label = aa_get_label(label);
844 }
845 aa_put_label(label);
846
847 return 0;
848}
849
850
851
852
853static int apparmor_socket_bind(struct socket *sock,
854 struct sockaddr *address, int addrlen)
855{
856 AA_BUG(!sock);
857 AA_BUG(!sock->sk);
858 AA_BUG(!address);
859 AA_BUG(in_interrupt());
860
861 return af_select(sock->sk->sk_family,
862 bind_perm(sock, address, addrlen),
863 aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk));
864}
865
866
867
868
869static int apparmor_socket_connect(struct socket *sock,
870 struct sockaddr *address, int addrlen)
871{
872 AA_BUG(!sock);
873 AA_BUG(!sock->sk);
874 AA_BUG(!address);
875 AA_BUG(in_interrupt());
876
877 return af_select(sock->sk->sk_family,
878 connect_perm(sock, address, addrlen),
879 aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk));
880}
881
882
883
884
885static int apparmor_socket_listen(struct socket *sock, int backlog)
886{
887 AA_BUG(!sock);
888 AA_BUG(!sock->sk);
889 AA_BUG(in_interrupt());
890
891 return af_select(sock->sk->sk_family,
892 listen_perm(sock, backlog),
893 aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk));
894}
895
896
897
898
899
900
901
902static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
903{
904 AA_BUG(!sock);
905 AA_BUG(!sock->sk);
906 AA_BUG(!newsock);
907 AA_BUG(in_interrupt());
908
909 return af_select(sock->sk->sk_family,
910 accept_perm(sock, newsock),
911 aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk));
912}
913
914static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
915 struct msghdr *msg, int size)
916{
917 AA_BUG(!sock);
918 AA_BUG(!sock->sk);
919 AA_BUG(!msg);
920 AA_BUG(in_interrupt());
921
922 return af_select(sock->sk->sk_family,
923 msg_perm(op, request, sock, msg, size),
924 aa_sk_perm(op, request, sock->sk));
925}
926
927
928
929
930static int apparmor_socket_sendmsg(struct socket *sock,
931 struct msghdr *msg, int size)
932{
933 return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
934}
935
936
937
938
939static int apparmor_socket_recvmsg(struct socket *sock,
940 struct msghdr *msg, int size, int flags)
941{
942 return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
943}
944
945
946static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
947{
948 AA_BUG(!sock);
949 AA_BUG(!sock->sk);
950 AA_BUG(in_interrupt());
951
952 return af_select(sock->sk->sk_family,
953 sock_perm(op, request, sock),
954 aa_sk_perm(op, request, sock->sk));
955}
956
957
958
959
960static int apparmor_socket_getsockname(struct socket *sock)
961{
962 return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
963}
964
965
966
967
968static int apparmor_socket_getpeername(struct socket *sock)
969{
970 return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
971}
972
973
974static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
975 int level, int optname)
976{
977 AA_BUG(!sock);
978 AA_BUG(!sock->sk);
979 AA_BUG(in_interrupt());
980
981 return af_select(sock->sk->sk_family,
982 opt_perm(op, request, sock, level, optname),
983 aa_sk_perm(op, request, sock->sk));
984}
985
986
987
988
989static int apparmor_socket_getsockopt(struct socket *sock, int level,
990 int optname)
991{
992 return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
993 level, optname);
994}
995
996
997
998
999static int apparmor_socket_setsockopt(struct socket *sock, int level,
1000 int optname)
1001{
1002 return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
1003 level, optname);
1004}
1005
1006
1007
1008
1009static int apparmor_socket_shutdown(struct socket *sock, int how)
1010{
1011 return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
1012}
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
1023{
1024 return 0;
1025}
1026
1027
1028static struct aa_label *sk_peer_label(struct sock *sk)
1029{
1030 struct aa_sk_ctx *ctx = SK_CTX(sk);
1031
1032 if (ctx->peer)
1033 return ctx->peer;
1034
1035 return ERR_PTR(-ENOPROTOOPT);
1036}
1037
1038
1039
1040
1041
1042
1043static int apparmor_socket_getpeersec_stream(struct socket *sock,
1044 char __user *optval,
1045 int __user *optlen,
1046 unsigned int len)
1047{
1048 char *name;
1049 int slen, error = 0;
1050 struct aa_label *label;
1051 struct aa_label *peer;
1052
1053 label = begin_current_label_crit_section();
1054 peer = sk_peer_label(sock->sk);
1055 if (IS_ERR(peer)) {
1056 error = PTR_ERR(peer);
1057 goto done;
1058 }
1059 slen = aa_label_asxprint(&name, labels_ns(label), peer,
1060 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
1061 FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
1062
1063 if (slen < 0) {
1064 error = -ENOMEM;
1065 } else {
1066 if (slen > len) {
1067 error = -ERANGE;
1068 } else if (copy_to_user(optval, name, slen)) {
1069 error = -EFAULT;
1070 goto out;
1071 }
1072 if (put_user(slen, optlen))
1073 error = -EFAULT;
1074out:
1075 kfree(name);
1076
1077 }
1078
1079done:
1080 end_current_label_crit_section(label);
1081
1082 return error;
1083}
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093static int apparmor_socket_getpeersec_dgram(struct socket *sock,
1094 struct sk_buff *skb, u32 *secid)
1095
1096{
1097
1098 return -ENOPROTOOPT;
1099}
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
1113{
1114 struct aa_sk_ctx *ctx = SK_CTX(sk);
1115
1116 if (!ctx->label)
1117 ctx->label = aa_get_current_label();
1118}
1119
1120static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
1121 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
1122 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
1123 LSM_HOOK_INIT(capget, apparmor_capget),
1124 LSM_HOOK_INIT(capable, apparmor_capable),
1125
1126 LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
1127 LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
1128 LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
1129
1130 LSM_HOOK_INIT(path_link, apparmor_path_link),
1131 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
1132 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
1133 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
1134 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
1135 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
1136 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
1137 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
1138 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
1139 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
1140 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
1141
1142 LSM_HOOK_INIT(file_open, apparmor_file_open),
1143 LSM_HOOK_INIT(file_receive, apparmor_file_receive),
1144 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
1145 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
1146 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
1147 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
1148 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
1149 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
1150
1151 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
1152 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
1153
1154 LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
1155 LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
1156 LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
1157
1158 LSM_HOOK_INIT(socket_create, apparmor_socket_create),
1159 LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
1160 LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
1161 LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
1162 LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
1163 LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
1164 LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
1165 LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
1166 LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
1167 LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
1168 LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
1169 LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
1170 LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
1171 LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
1172 LSM_HOOK_INIT(socket_getpeersec_stream,
1173 apparmor_socket_getpeersec_stream),
1174 LSM_HOOK_INIT(socket_getpeersec_dgram,
1175 apparmor_socket_getpeersec_dgram),
1176 LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
1177
1178 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
1179 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
1180 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
1181 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
1182
1183 LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds),
1184 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
1185 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
1186
1187 LSM_HOOK_INIT(task_free, apparmor_task_free),
1188 LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
1189 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
1190 LSM_HOOK_INIT(task_kill, apparmor_task_kill),
1191};
1192
1193
1194
1195
1196
1197static int param_set_aabool(const char *val, const struct kernel_param *kp);
1198static int param_get_aabool(char *buffer, const struct kernel_param *kp);
1199#define param_check_aabool param_check_bool
1200static const struct kernel_param_ops param_ops_aabool = {
1201 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1202 .set = param_set_aabool,
1203 .get = param_get_aabool
1204};
1205
1206static int param_set_aauint(const char *val, const struct kernel_param *kp);
1207static int param_get_aauint(char *buffer, const struct kernel_param *kp);
1208#define param_check_aauint param_check_uint
1209static const struct kernel_param_ops param_ops_aauint = {
1210 .set = param_set_aauint,
1211 .get = param_get_aauint
1212};
1213
1214static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
1215static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
1216#define param_check_aalockpolicy param_check_bool
1217static const struct kernel_param_ops param_ops_aalockpolicy = {
1218 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1219 .set = param_set_aalockpolicy,
1220 .get = param_get_aalockpolicy
1221};
1222
1223static int param_set_audit(const char *val, const struct kernel_param *kp);
1224static int param_get_audit(char *buffer, const struct kernel_param *kp);
1225
1226static int param_set_mode(const char *val, const struct kernel_param *kp);
1227static int param_get_mode(char *buffer, const struct kernel_param *kp);
1228
1229
1230
1231
1232
1233
1234enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
1235module_param_call(mode, param_set_mode, param_get_mode,
1236 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
1237
1238
1239bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
1240#ifdef CONFIG_SECURITY_APPARMOR_HASH
1241module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
1242#endif
1243
1244
1245bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
1246module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
1247
1248
1249enum audit_mode aa_g_audit;
1250module_param_call(audit, param_set_audit, param_get_audit,
1251 &aa_g_audit, S_IRUSR | S_IWUSR);
1252
1253
1254
1255
1256bool aa_g_audit_header = true;
1257module_param_named(audit_header, aa_g_audit_header, aabool,
1258 S_IRUSR | S_IWUSR);
1259
1260
1261
1262
1263
1264bool aa_g_lock_policy;
1265module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
1266 S_IRUSR | S_IWUSR);
1267
1268
1269bool aa_g_logsyscall;
1270module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
1271
1272
1273unsigned int aa_g_path_max = 2 * PATH_MAX;
1274module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
1275
1276
1277
1278
1279
1280
1281bool aa_g_paranoid_load = true;
1282module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
1283
1284
1285static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
1286module_param_named(enabled, apparmor_enabled, bool, S_IRUGO);
1287
1288static int __init apparmor_enabled_setup(char *str)
1289{
1290 unsigned long enabled;
1291 int error = kstrtoul(str, 0, &enabled);
1292 if (!error)
1293 apparmor_enabled = enabled ? 1 : 0;
1294 return 1;
1295}
1296
1297__setup("apparmor=", apparmor_enabled_setup);
1298
1299
1300static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
1301{
1302 if (!apparmor_enabled)
1303 return -EINVAL;
1304 if (apparmor_initialized && !policy_admin_capable(NULL))
1305 return -EPERM;
1306 return param_set_bool(val, kp);
1307}
1308
1309static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
1310{
1311 if (!apparmor_enabled)
1312 return -EINVAL;
1313 if (apparmor_initialized && !policy_view_capable(NULL))
1314 return -EPERM;
1315 return param_get_bool(buffer, kp);
1316}
1317
1318static int param_set_aabool(const char *val, const struct kernel_param *kp)
1319{
1320 if (!apparmor_enabled)
1321 return -EINVAL;
1322 if (apparmor_initialized && !policy_admin_capable(NULL))
1323 return -EPERM;
1324 return param_set_bool(val, kp);
1325}
1326
1327static int param_get_aabool(char *buffer, const struct kernel_param *kp)
1328{
1329 if (!apparmor_enabled)
1330 return -EINVAL;
1331 if (apparmor_initialized && !policy_view_capable(NULL))
1332 return -EPERM;
1333 return param_get_bool(buffer, kp);
1334}
1335
1336static int param_set_aauint(const char *val, const struct kernel_param *kp)
1337{
1338 int error;
1339
1340 if (!apparmor_enabled)
1341 return -EINVAL;
1342
1343 if (apparmor_initialized)
1344 return -EPERM;
1345
1346 error = param_set_uint(val, kp);
1347 pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
1348
1349 return error;
1350}
1351
1352static int param_get_aauint(char *buffer, const struct kernel_param *kp)
1353{
1354 if (!apparmor_enabled)
1355 return -EINVAL;
1356 if (apparmor_initialized && !policy_view_capable(NULL))
1357 return -EPERM;
1358 return param_get_uint(buffer, kp);
1359}
1360
1361static int param_get_audit(char *buffer, const struct kernel_param *kp)
1362{
1363 if (!apparmor_enabled)
1364 return -EINVAL;
1365 if (apparmor_initialized && !policy_view_capable(NULL))
1366 return -EPERM;
1367 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
1368}
1369
1370static int param_set_audit(const char *val, const struct kernel_param *kp)
1371{
1372 int i;
1373
1374 if (!apparmor_enabled)
1375 return -EINVAL;
1376 if (!val)
1377 return -EINVAL;
1378 if (apparmor_initialized && !policy_admin_capable(NULL))
1379 return -EPERM;
1380
1381 for (i = 0; i < AUDIT_MAX_INDEX; i++) {
1382 if (strcmp(val, audit_mode_names[i]) == 0) {
1383 aa_g_audit = i;
1384 return 0;
1385 }
1386 }
1387
1388 return -EINVAL;
1389}
1390
1391static int param_get_mode(char *buffer, const struct kernel_param *kp)
1392{
1393 if (!apparmor_enabled)
1394 return -EINVAL;
1395 if (apparmor_initialized && !policy_view_capable(NULL))
1396 return -EPERM;
1397
1398 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
1399}
1400
1401static int param_set_mode(const char *val, const struct kernel_param *kp)
1402{
1403 int i;
1404
1405 if (!apparmor_enabled)
1406 return -EINVAL;
1407 if (!val)
1408 return -EINVAL;
1409 if (apparmor_initialized && !policy_admin_capable(NULL))
1410 return -EPERM;
1411
1412 for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) {
1413 if (strcmp(val, aa_profile_mode_names[i]) == 0) {
1414 aa_g_profile_mode = i;
1415 return 0;
1416 }
1417 }
1418
1419 return -EINVAL;
1420}
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431static int __init set_init_ctx(void)
1432{
1433 struct cred *cred = (struct cred *)current->real_cred;
1434 struct aa_task_ctx *ctx;
1435
1436 ctx = aa_alloc_task_ctx(GFP_KERNEL);
1437 if (!ctx)
1438 return -ENOMEM;
1439
1440 cred_label(cred) = aa_get_label(ns_unconfined(root_ns));
1441 task_ctx(current) = ctx;
1442
1443 return 0;
1444}
1445
1446static void destroy_buffers(void)
1447{
1448 u32 i, j;
1449
1450 for_each_possible_cpu(i) {
1451 for_each_cpu_buffer(j) {
1452 kfree(per_cpu(aa_buffers, i).buf[j]);
1453 per_cpu(aa_buffers, i).buf[j] = NULL;
1454 }
1455 }
1456}
1457
1458static int __init alloc_buffers(void)
1459{
1460 u32 i, j;
1461
1462 for_each_possible_cpu(i) {
1463 for_each_cpu_buffer(j) {
1464 char *buffer;
1465
1466 if (cpu_to_node(i) > num_online_nodes())
1467
1468 buffer = kmalloc(aa_g_path_max, GFP_KERNEL);
1469 else
1470 buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL,
1471 cpu_to_node(i));
1472 if (!buffer) {
1473 destroy_buffers();
1474 return -ENOMEM;
1475 }
1476 per_cpu(aa_buffers, i).buf[j] = buffer;
1477 }
1478 }
1479
1480 return 0;
1481}
1482
1483#ifdef CONFIG_SYSCTL
1484static int apparmor_dointvec(struct ctl_table *table, int write,
1485 void __user *buffer, size_t *lenp, loff_t *ppos)
1486{
1487 if (!policy_admin_capable(NULL))
1488 return -EPERM;
1489 if (!apparmor_enabled)
1490 return -EINVAL;
1491
1492 return proc_dointvec(table, write, buffer, lenp, ppos);
1493}
1494
1495static struct ctl_path apparmor_sysctl_path[] = {
1496 { .procname = "kernel", },
1497 { }
1498};
1499
1500static struct ctl_table apparmor_sysctl_table[] = {
1501 {
1502 .procname = "unprivileged_userns_apparmor_policy",
1503 .data = &unprivileged_userns_apparmor_policy,
1504 .maxlen = sizeof(int),
1505 .mode = 0600,
1506 .proc_handler = apparmor_dointvec,
1507 },
1508 { }
1509};
1510
1511static int __init apparmor_init_sysctl(void)
1512{
1513 return register_sysctl_paths(apparmor_sysctl_path,
1514 apparmor_sysctl_table) ? 0 : -ENOMEM;
1515}
1516#else
1517static inline int apparmor_init_sysctl(void)
1518{
1519 return 0;
1520}
1521#endif
1522
1523static int __init apparmor_init(void)
1524{
1525 int error;
1526
1527 if (!apparmor_enabled || !security_module_enable("apparmor")) {
1528 aa_info_message("AppArmor disabled by boot time parameter");
1529 apparmor_enabled = false;
1530 return 0;
1531 }
1532
1533 error = aa_setup_dfa_engine();
1534 if (error) {
1535 AA_ERROR("Unable to setup dfa engine\n");
1536 goto alloc_out;
1537 }
1538
1539 error = aa_alloc_root_ns();
1540 if (error) {
1541 AA_ERROR("Unable to allocate default profile namespace\n");
1542 goto alloc_out;
1543 }
1544
1545 error = apparmor_init_sysctl();
1546 if (error) {
1547 AA_ERROR("Unable to register sysctls\n");
1548 goto alloc_out;
1549
1550 }
1551
1552 error = alloc_buffers();
1553 if (error) {
1554 AA_ERROR("Unable to allocate work buffers\n");
1555 goto buffers_out;
1556 }
1557
1558 error = set_init_ctx();
1559 if (error) {
1560 AA_ERROR("Failed to set context on init task\n");
1561 aa_free_root_ns();
1562 goto buffers_out;
1563 }
1564 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
1565 "apparmor");
1566
1567
1568 apparmor_initialized = 1;
1569 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1570 aa_info_message("AppArmor initialized: complain mode enabled");
1571 else if (aa_g_profile_mode == APPARMOR_KILL)
1572 aa_info_message("AppArmor initialized: kill mode enabled");
1573 else
1574 aa_info_message("AppArmor initialized");
1575
1576 return error;
1577
1578buffers_out:
1579 destroy_buffers();
1580
1581alloc_out:
1582 aa_destroy_aafs();
1583 aa_teardown_dfa_engine();
1584
1585 apparmor_enabled = false;
1586 return error;
1587}
1588
1589security_initcall(apparmor_init);
1590