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12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/sched.h>
15#include <linux/slab.h>
16#include <linux/syscalls.h>
17#include <linux/key.h>
18#include <linux/keyctl.h>
19#include <linux/fs.h>
20#include <linux/capability.h>
21#include <linux/string.h>
22#include <linux/err.h>
23#include <linux/vmalloc.h>
24#include <linux/security.h>
25#include <linux/uio.h>
26#include <asm/uaccess.h>
27#include "internal.h"
28
29static int key_get_type_from_user(char *type,
30 const char __user *_type,
31 unsigned len)
32{
33 int ret;
34
35 ret = strncpy_from_user(type, _type, len);
36 if (ret < 0)
37 return ret;
38 if (ret == 0 || ret >= len)
39 return -EINVAL;
40 if (type[0] == '.')
41 return -EPERM;
42 type[len - 1] = '\0';
43 return 0;
44}
45
46
47
48
49
50
51
52
53
54
55
56
57
58SYSCALL_DEFINE5(add_key, const char __user *, _type,
59 const char __user *, _description,
60 const void __user *, _payload,
61 size_t, plen,
62 key_serial_t, ringid)
63{
64 key_ref_t keyring_ref, key_ref;
65 char type[32], *description;
66 void *payload;
67 long ret;
68 bool vm;
69
70 ret = -EINVAL;
71 if (plen > 1024 * 1024 - 1)
72 goto error;
73
74
75 ret = key_get_type_from_user(type, _type, sizeof(type));
76 if (ret < 0)
77 goto error;
78
79 description = NULL;
80 if (_description) {
81 description = strndup_user(_description, PAGE_SIZE);
82 if (IS_ERR(description)) {
83 ret = PTR_ERR(description);
84 goto error;
85 }
86 if (!*description) {
87 kfree(description);
88 description = NULL;
89 }
90 }
91
92
93 payload = NULL;
94
95 vm = false;
96 if (_payload) {
97 ret = -ENOMEM;
98 payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN);
99 if (!payload) {
100 if (plen <= PAGE_SIZE)
101 goto error2;
102 vm = true;
103 payload = vmalloc(plen);
104 if (!payload)
105 goto error2;
106 }
107
108 ret = -EFAULT;
109 if (copy_from_user(payload, _payload, plen) != 0)
110 goto error3;
111 }
112
113
114 keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE);
115 if (IS_ERR(keyring_ref)) {
116 ret = PTR_ERR(keyring_ref);
117 goto error3;
118 }
119
120
121
122 key_ref = key_create_or_update(keyring_ref, type, description,
123 payload, plen, KEY_PERM_UNDEF,
124 KEY_ALLOC_IN_QUOTA);
125 if (!IS_ERR(key_ref)) {
126 ret = key_ref_to_ptr(key_ref)->serial;
127 key_ref_put(key_ref);
128 }
129 else {
130 ret = PTR_ERR(key_ref);
131 }
132
133 key_ref_put(keyring_ref);
134 error3:
135 if (!vm)
136 kfree(payload);
137 else
138 vfree(payload);
139 error2:
140 kfree(description);
141 error:
142 return ret;
143}
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158SYSCALL_DEFINE4(request_key, const char __user *, _type,
159 const char __user *, _description,
160 const char __user *, _callout_info,
161 key_serial_t, destringid)
162{
163 struct key_type *ktype;
164 struct key *key;
165 key_ref_t dest_ref;
166 size_t callout_len;
167 char type[32], *description, *callout_info;
168 long ret;
169
170
171 ret = key_get_type_from_user(type, _type, sizeof(type));
172 if (ret < 0)
173 goto error;
174
175
176 description = strndup_user(_description, PAGE_SIZE);
177 if (IS_ERR(description)) {
178 ret = PTR_ERR(description);
179 goto error;
180 }
181
182
183 callout_info = NULL;
184 callout_len = 0;
185 if (_callout_info) {
186 callout_info = strndup_user(_callout_info, PAGE_SIZE);
187 if (IS_ERR(callout_info)) {
188 ret = PTR_ERR(callout_info);
189 goto error2;
190 }
191 callout_len = strlen(callout_info);
192 }
193
194
195 dest_ref = NULL;
196 if (destringid) {
197 dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE,
198 KEY_WRITE);
199 if (IS_ERR(dest_ref)) {
200 ret = PTR_ERR(dest_ref);
201 goto error3;
202 }
203 }
204
205
206 ktype = key_type_lookup(type);
207 if (IS_ERR(ktype)) {
208 ret = PTR_ERR(ktype);
209 goto error4;
210 }
211
212
213 key = request_key_and_link(ktype, description, callout_info,
214 callout_len, NULL, key_ref_to_ptr(dest_ref),
215 KEY_ALLOC_IN_QUOTA);
216 if (IS_ERR(key)) {
217 ret = PTR_ERR(key);
218 goto error5;
219 }
220
221
222 ret = wait_for_key_construction(key, 1);
223 if (ret < 0)
224 goto error6;
225
226 ret = key->serial;
227
228error6:
229 key_put(key);
230error5:
231 key_type_put(ktype);
232error4:
233 key_ref_put(dest_ref);
234error3:
235 kfree(callout_info);
236error2:
237 kfree(description);
238error:
239 return ret;
240}
241
242
243
244
245
246
247
248
249long keyctl_get_keyring_ID(key_serial_t id, int create)
250{
251 key_ref_t key_ref;
252 unsigned long lflags;
253 long ret;
254
255 lflags = create ? KEY_LOOKUP_CREATE : 0;
256 key_ref = lookup_user_key(id, lflags, KEY_SEARCH);
257 if (IS_ERR(key_ref)) {
258 ret = PTR_ERR(key_ref);
259 goto error;
260 }
261
262 ret = key_ref_to_ptr(key_ref)->serial;
263 key_ref_put(key_ref);
264error:
265 return ret;
266}
267
268
269
270
271
272
273
274
275
276
277
278long keyctl_join_session_keyring(const char __user *_name)
279{
280 char *name;
281 long ret;
282
283
284 name = NULL;
285 if (_name) {
286 name = strndup_user(_name, PAGE_SIZE);
287 if (IS_ERR(name)) {
288 ret = PTR_ERR(name);
289 goto error;
290 }
291 }
292
293
294 ret = join_session_keyring(name);
295 kfree(name);
296
297error:
298 return ret;
299}
300
301
302
303
304
305
306
307
308
309
310
311long keyctl_update_key(key_serial_t id,
312 const void __user *_payload,
313 size_t plen)
314{
315 key_ref_t key_ref;
316 void *payload;
317 long ret;
318
319 ret = -EINVAL;
320 if (plen > PAGE_SIZE)
321 goto error;
322
323
324 payload = NULL;
325 if (_payload) {
326 ret = -ENOMEM;
327 payload = kmalloc(plen, GFP_KERNEL);
328 if (!payload)
329 goto error;
330
331 ret = -EFAULT;
332 if (copy_from_user(payload, _payload, plen) != 0)
333 goto error2;
334 }
335
336
337 key_ref = lookup_user_key(id, 0, KEY_WRITE);
338 if (IS_ERR(key_ref)) {
339 ret = PTR_ERR(key_ref);
340 goto error2;
341 }
342
343
344 ret = key_update(key_ref, payload, plen);
345
346 key_ref_put(key_ref);
347error2:
348 kfree(payload);
349error:
350 return ret;
351}
352
353
354
355
356
357
358
359
360
361
362
363long keyctl_revoke_key(key_serial_t id)
364{
365 key_ref_t key_ref;
366 long ret;
367
368 key_ref = lookup_user_key(id, 0, KEY_WRITE);
369 if (IS_ERR(key_ref)) {
370 ret = PTR_ERR(key_ref);
371 if (ret != -EACCES)
372 goto error;
373 key_ref = lookup_user_key(id, 0, KEY_SETATTR);
374 if (IS_ERR(key_ref)) {
375 ret = PTR_ERR(key_ref);
376 goto error;
377 }
378 }
379
380 key_revoke(key_ref_to_ptr(key_ref));
381 ret = 0;
382
383 key_ref_put(key_ref);
384error:
385 return ret;
386}
387
388
389
390
391
392
393
394
395
396
397long keyctl_invalidate_key(key_serial_t id)
398{
399 key_ref_t key_ref;
400 long ret;
401
402 kenter("%d", id);
403
404 key_ref = lookup_user_key(id, 0, KEY_SEARCH);
405 if (IS_ERR(key_ref)) {
406 ret = PTR_ERR(key_ref);
407 goto error;
408 }
409
410 key_invalidate(key_ref_to_ptr(key_ref));
411 ret = 0;
412
413 key_ref_put(key_ref);
414error:
415 kleave(" = %ld", ret);
416 return ret;
417}
418
419
420
421
422
423
424
425
426long keyctl_keyring_clear(key_serial_t ringid)
427{
428 key_ref_t keyring_ref;
429 long ret;
430
431 keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE);
432 if (IS_ERR(keyring_ref)) {
433 ret = PTR_ERR(keyring_ref);
434
435
436 if (capable(CAP_SYS_ADMIN)) {
437 keyring_ref = lookup_user_key(ringid, 0, 0);
438 if (IS_ERR(keyring_ref))
439 goto error;
440 if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR,
441 &key_ref_to_ptr(keyring_ref)->flags))
442 goto clear;
443 goto error_put;
444 }
445
446 goto error;
447 }
448
449clear:
450 ret = keyring_clear(key_ref_to_ptr(keyring_ref));
451error_put:
452 key_ref_put(keyring_ref);
453error:
454 return ret;
455}
456
457
458
459
460
461
462
463
464
465
466
467
468long keyctl_keyring_link(key_serial_t id, key_serial_t ringid)
469{
470 key_ref_t keyring_ref, key_ref;
471 long ret;
472
473 keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE);
474 if (IS_ERR(keyring_ref)) {
475 ret = PTR_ERR(keyring_ref);
476 goto error;
477 }
478
479 key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_LINK);
480 if (IS_ERR(key_ref)) {
481 ret = PTR_ERR(key_ref);
482 goto error2;
483 }
484
485 ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref));
486
487 key_ref_put(key_ref);
488error2:
489 key_ref_put(keyring_ref);
490error:
491 return ret;
492}
493
494
495
496
497
498
499
500
501
502
503long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid)
504{
505 key_ref_t keyring_ref, key_ref;
506 long ret;
507
508 keyring_ref = lookup_user_key(ringid, 0, KEY_WRITE);
509 if (IS_ERR(keyring_ref)) {
510 ret = PTR_ERR(keyring_ref);
511 goto error;
512 }
513
514 key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0);
515 if (IS_ERR(key_ref)) {
516 ret = PTR_ERR(key_ref);
517 goto error2;
518 }
519
520 ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref));
521
522 key_ref_put(key_ref);
523error2:
524 key_ref_put(keyring_ref);
525error:
526 return ret;
527}
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542long keyctl_describe_key(key_serial_t keyid,
543 char __user *buffer,
544 size_t buflen)
545{
546 struct key *key, *instkey;
547 key_ref_t key_ref;
548 char *tmpbuf;
549 long ret;
550
551 key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW);
552 if (IS_ERR(key_ref)) {
553
554
555 if (PTR_ERR(key_ref) == -EACCES) {
556 instkey = key_get_instantiation_authkey(keyid);
557 if (!IS_ERR(instkey)) {
558 key_put(instkey);
559 key_ref = lookup_user_key(keyid,
560 KEY_LOOKUP_PARTIAL,
561 0);
562 if (!IS_ERR(key_ref))
563 goto okay;
564 }
565 }
566
567 ret = PTR_ERR(key_ref);
568 goto error;
569 }
570
571okay:
572
573 ret = -ENOMEM;
574 tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
575 if (!tmpbuf)
576 goto error2;
577
578 key = key_ref_to_ptr(key_ref);
579
580 ret = snprintf(tmpbuf, PAGE_SIZE - 1,
581 "%s;%d;%d;%08x;%s",
582 key->type->name,
583 from_kuid_munged(current_user_ns(), key->uid),
584 from_kgid_munged(current_user_ns(), key->gid),
585 key->perm,
586 key->description ?: "");
587
588
589 if (ret > PAGE_SIZE - 1)
590 ret = PAGE_SIZE - 1;
591 tmpbuf[ret] = 0;
592 ret++;
593
594
595 if (buffer && buflen > 0) {
596 if (buflen > ret)
597 buflen = ret;
598
599 if (copy_to_user(buffer, tmpbuf, buflen) != 0)
600 ret = -EFAULT;
601 }
602
603 kfree(tmpbuf);
604error2:
605 key_ref_put(key_ref);
606error:
607 return ret;
608}
609
610
611
612
613
614
615
616
617
618
619
620long keyctl_keyring_search(key_serial_t ringid,
621 const char __user *_type,
622 const char __user *_description,
623 key_serial_t destringid)
624{
625 struct key_type *ktype;
626 key_ref_t keyring_ref, key_ref, dest_ref;
627 char type[32], *description;
628 long ret;
629
630
631 ret = key_get_type_from_user(type, _type, sizeof(type));
632 if (ret < 0)
633 goto error;
634
635 description = strndup_user(_description, PAGE_SIZE);
636 if (IS_ERR(description)) {
637 ret = PTR_ERR(description);
638 goto error;
639 }
640
641
642 keyring_ref = lookup_user_key(ringid, 0, KEY_SEARCH);
643 if (IS_ERR(keyring_ref)) {
644 ret = PTR_ERR(keyring_ref);
645 goto error2;
646 }
647
648
649 dest_ref = NULL;
650 if (destringid) {
651 dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE,
652 KEY_WRITE);
653 if (IS_ERR(dest_ref)) {
654 ret = PTR_ERR(dest_ref);
655 goto error3;
656 }
657 }
658
659
660 ktype = key_type_lookup(type);
661 if (IS_ERR(ktype)) {
662 ret = PTR_ERR(ktype);
663 goto error4;
664 }
665
666
667 key_ref = keyring_search(keyring_ref, ktype, description);
668 if (IS_ERR(key_ref)) {
669 ret = PTR_ERR(key_ref);
670
671
672 if (ret == -EAGAIN)
673 ret = -ENOKEY;
674 goto error5;
675 }
676
677
678 if (dest_ref) {
679 ret = key_permission(key_ref, KEY_LINK);
680 if (ret < 0)
681 goto error6;
682
683 ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref));
684 if (ret < 0)
685 goto error6;
686 }
687
688 ret = key_ref_to_ptr(key_ref)->serial;
689
690error6:
691 key_ref_put(key_ref);
692error5:
693 key_type_put(ktype);
694error4:
695 key_ref_put(dest_ref);
696error3:
697 key_ref_put(keyring_ref);
698error2:
699 kfree(description);
700error:
701 return ret;
702}
703
704
705
706
707
708
709
710
711
712
713
714long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen)
715{
716 struct key *key;
717 key_ref_t key_ref;
718 long ret;
719
720
721 key_ref = lookup_user_key(keyid, 0, 0);
722 if (IS_ERR(key_ref)) {
723 ret = -ENOKEY;
724 goto error;
725 }
726
727 key = key_ref_to_ptr(key_ref);
728
729
730 ret = key_permission(key_ref, KEY_READ);
731 if (ret == 0)
732 goto can_read_key;
733 if (ret != -EACCES)
734 goto error;
735
736
737
738
739
740 if (!is_key_possessed(key_ref)) {
741 ret = -EACCES;
742 goto error2;
743 }
744
745
746can_read_key:
747 ret = key_validate(key);
748 if (ret == 0) {
749 ret = -EOPNOTSUPP;
750 if (key->type->read) {
751
752
753 down_read(&key->sem);
754 ret = key->type->read(key, buffer, buflen);
755 up_read(&key->sem);
756 }
757 }
758
759error2:
760 key_put(key);
761error:
762 return ret;
763}
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group)
781{
782 struct key_user *newowner, *zapowner = NULL;
783 struct key *key;
784 key_ref_t key_ref;
785 long ret;
786 kuid_t uid;
787 kgid_t gid;
788
789 uid = make_kuid(current_user_ns(), user);
790 gid = make_kgid(current_user_ns(), group);
791 ret = -EINVAL;
792 if ((user != (uid_t) -1) && !uid_valid(uid))
793 goto error;
794 if ((group != (gid_t) -1) && !gid_valid(gid))
795 goto error;
796
797 ret = 0;
798 if (user == (uid_t) -1 && group == (gid_t) -1)
799 goto error;
800
801 key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL,
802 KEY_SETATTR);
803 if (IS_ERR(key_ref)) {
804 ret = PTR_ERR(key_ref);
805 goto error;
806 }
807
808 key = key_ref_to_ptr(key_ref);
809
810
811 ret = -EACCES;
812 down_write(&key->sem);
813
814 if (!capable(CAP_SYS_ADMIN)) {
815
816 if (user != (uid_t) -1 && !uid_eq(key->uid, uid))
817 goto error_put;
818
819
820
821 if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid))
822 goto error_put;
823 }
824
825
826 if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) {
827 ret = -ENOMEM;
828 newowner = key_user_lookup(uid);
829 if (!newowner)
830 goto error_put;
831
832
833 if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) {
834 unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ?
835 key_quota_root_maxkeys : key_quota_maxkeys;
836 unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ?
837 key_quota_root_maxbytes : key_quota_maxbytes;
838
839 spin_lock(&newowner->lock);
840 if (newowner->qnkeys + 1 >= maxkeys ||
841 newowner->qnbytes + key->quotalen >= maxbytes ||
842 newowner->qnbytes + key->quotalen <
843 newowner->qnbytes)
844 goto quota_overrun;
845
846 newowner->qnkeys++;
847 newowner->qnbytes += key->quotalen;
848 spin_unlock(&newowner->lock);
849
850 spin_lock(&key->user->lock);
851 key->user->qnkeys--;
852 key->user->qnbytes -= key->quotalen;
853 spin_unlock(&key->user->lock);
854 }
855
856 atomic_dec(&key->user->nkeys);
857 atomic_inc(&newowner->nkeys);
858
859 if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) {
860 atomic_dec(&key->user->nikeys);
861 atomic_inc(&newowner->nikeys);
862 }
863
864 zapowner = key->user;
865 key->user = newowner;
866 key->uid = uid;
867 }
868
869
870 if (group != (gid_t) -1)
871 key->gid = gid;
872
873 ret = 0;
874
875error_put:
876 up_write(&key->sem);
877 key_put(key);
878 if (zapowner)
879 key_user_put(zapowner);
880error:
881 return ret;
882
883quota_overrun:
884 spin_unlock(&newowner->lock);
885 zapowner = newowner;
886 ret = -EDQUOT;
887 goto error_put;
888}
889
890
891
892
893
894
895
896
897long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
898{
899 struct key *key;
900 key_ref_t key_ref;
901 long ret;
902
903 ret = -EINVAL;
904 if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL))
905 goto error;
906
907 key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL,
908 KEY_SETATTR);
909 if (IS_ERR(key_ref)) {
910 ret = PTR_ERR(key_ref);
911 goto error;
912 }
913
914 key = key_ref_to_ptr(key_ref);
915
916
917 ret = -EACCES;
918 down_write(&key->sem);
919
920
921 if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) {
922 key->perm = perm;
923 ret = 0;
924 }
925
926 up_write(&key->sem);
927 key_put(key);
928error:
929 return ret;
930}
931
932
933
934
935
936static long get_instantiation_keyring(key_serial_t ringid,
937 struct request_key_auth *rka,
938 struct key **_dest_keyring)
939{
940 key_ref_t dkref;
941
942 *_dest_keyring = NULL;
943
944
945 if (ringid == 0)
946 return 0;
947
948
949 if (ringid > 0) {
950 dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE);
951 if (IS_ERR(dkref))
952 return PTR_ERR(dkref);
953 *_dest_keyring = key_ref_to_ptr(dkref);
954 return 0;
955 }
956
957 if (ringid == KEY_SPEC_REQKEY_AUTH_KEY)
958 return -EINVAL;
959
960
961
962 if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) {
963 *_dest_keyring = key_get(rka->dest_keyring);
964 return 0;
965 }
966
967 return -ENOKEY;
968}
969
970
971
972
973static int keyctl_change_reqkey_auth(struct key *key)
974{
975 struct cred *new;
976
977 new = prepare_creds();
978 if (!new)
979 return -ENOMEM;
980
981 key_put(new->request_key_auth);
982 new->request_key_auth = key_get(key);
983
984 return commit_creds(new);
985}
986
987
988
989
990static long copy_from_user_iovec(void *buffer, const struct iovec *iov,
991 unsigned ioc)
992{
993 for (; ioc > 0; ioc--) {
994 if (copy_from_user(buffer, iov->iov_base, iov->iov_len) != 0)
995 return -EFAULT;
996 buffer += iov->iov_len;
997 iov++;
998 }
999 return 0;
1000}
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011long keyctl_instantiate_key_common(key_serial_t id,
1012 const struct iovec *payload_iov,
1013 unsigned ioc,
1014 size_t plen,
1015 key_serial_t ringid)
1016{
1017 const struct cred *cred = current_cred();
1018 struct request_key_auth *rka;
1019 struct key *instkey, *dest_keyring;
1020 void *payload;
1021 long ret;
1022 bool vm = false;
1023
1024 kenter("%d,,%zu,%d", id, plen, ringid);
1025
1026 ret = -EINVAL;
1027 if (plen > 1024 * 1024 - 1)
1028 goto error;
1029
1030
1031
1032 ret = -EPERM;
1033 instkey = cred->request_key_auth;
1034 if (!instkey)
1035 goto error;
1036
1037 rka = instkey->payload.data;
1038 if (rka->target_key->serial != id)
1039 goto error;
1040
1041
1042 payload = NULL;
1043
1044 if (payload_iov) {
1045 ret = -ENOMEM;
1046 payload = kmalloc(plen, GFP_KERNEL);
1047 if (!payload) {
1048 if (plen <= PAGE_SIZE)
1049 goto error;
1050 vm = true;
1051 payload = vmalloc(plen);
1052 if (!payload)
1053 goto error;
1054 }
1055
1056 ret = copy_from_user_iovec(payload, payload_iov, ioc);
1057 if (ret < 0)
1058 goto error2;
1059 }
1060
1061
1062
1063 ret = get_instantiation_keyring(ringid, rka, &dest_keyring);
1064 if (ret < 0)
1065 goto error2;
1066
1067
1068 ret = key_instantiate_and_link(rka->target_key, payload, plen,
1069 dest_keyring, instkey);
1070
1071 key_put(dest_keyring);
1072
1073
1074
1075 if (ret == 0)
1076 keyctl_change_reqkey_auth(NULL);
1077
1078error2:
1079 if (!vm)
1080 kfree(payload);
1081 else
1082 vfree(payload);
1083error:
1084 return ret;
1085}
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096long keyctl_instantiate_key(key_serial_t id,
1097 const void __user *_payload,
1098 size_t plen,
1099 key_serial_t ringid)
1100{
1101 if (_payload && plen) {
1102 struct iovec iov[1] = {
1103 [0].iov_base = (void __user *)_payload,
1104 [0].iov_len = plen
1105 };
1106
1107 return keyctl_instantiate_key_common(id, iov, 1, plen, ringid);
1108 }
1109
1110 return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid);
1111}
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122long keyctl_instantiate_key_iov(key_serial_t id,
1123 const struct iovec __user *_payload_iov,
1124 unsigned ioc,
1125 key_serial_t ringid)
1126{
1127 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1128 long ret;
1129
1130 if (!_payload_iov || !ioc)
1131 goto no_payload;
1132
1133 ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc,
1134 ARRAY_SIZE(iovstack), iovstack, &iov);
1135 if (ret < 0)
1136 goto err;
1137 if (ret == 0)
1138 goto no_payload_free;
1139
1140 ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid);
1141err:
1142 if (iov != iovstack)
1143 kfree(iov);
1144 return ret;
1145
1146no_payload_free:
1147 if (iov != iovstack)
1148 kfree(iov);
1149no_payload:
1150 return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid);
1151}
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
1169{
1170 return keyctl_reject_key(id, timeout, ENOKEY, ringid);
1171}
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error,
1189 key_serial_t ringid)
1190{
1191 const struct cred *cred = current_cred();
1192 struct request_key_auth *rka;
1193 struct key *instkey, *dest_keyring;
1194 long ret;
1195
1196 kenter("%d,%u,%u,%d", id, timeout, error, ringid);
1197
1198
1199 if (error <= 0 ||
1200 error >= MAX_ERRNO ||
1201 error == ERESTARTSYS ||
1202 error == ERESTARTNOINTR ||
1203 error == ERESTARTNOHAND ||
1204 error == ERESTART_RESTARTBLOCK)
1205 return -EINVAL;
1206
1207
1208
1209 ret = -EPERM;
1210 instkey = cred->request_key_auth;
1211 if (!instkey)
1212 goto error;
1213
1214 rka = instkey->payload.data;
1215 if (rka->target_key->serial != id)
1216 goto error;
1217
1218
1219
1220 ret = get_instantiation_keyring(ringid, rka, &dest_keyring);
1221 if (ret < 0)
1222 goto error;
1223
1224
1225 ret = key_reject_and_link(rka->target_key, timeout, error,
1226 dest_keyring, instkey);
1227
1228 key_put(dest_keyring);
1229
1230
1231
1232 if (ret == 0)
1233 keyctl_change_reqkey_auth(NULL);
1234
1235error:
1236 return ret;
1237}
1238
1239
1240
1241
1242
1243
1244
1245
1246long keyctl_set_reqkey_keyring(int reqkey_defl)
1247{
1248 struct cred *new;
1249 int ret, old_setting;
1250
1251 old_setting = current_cred_xxx(jit_keyring);
1252
1253 if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE)
1254 return old_setting;
1255
1256 new = prepare_creds();
1257 if (!new)
1258 return -ENOMEM;
1259
1260 switch (reqkey_defl) {
1261 case KEY_REQKEY_DEFL_THREAD_KEYRING:
1262 ret = install_thread_keyring_to_cred(new);
1263 if (ret < 0)
1264 goto error;
1265 goto set;
1266
1267 case KEY_REQKEY_DEFL_PROCESS_KEYRING:
1268 ret = install_process_keyring_to_cred(new);
1269 if (ret < 0) {
1270 if (ret != -EEXIST)
1271 goto error;
1272 ret = 0;
1273 }
1274 goto set;
1275
1276 case KEY_REQKEY_DEFL_DEFAULT:
1277 case KEY_REQKEY_DEFL_SESSION_KEYRING:
1278 case KEY_REQKEY_DEFL_USER_KEYRING:
1279 case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
1280 case KEY_REQKEY_DEFL_REQUESTOR_KEYRING:
1281 goto set;
1282
1283 case KEY_REQKEY_DEFL_NO_CHANGE:
1284 case KEY_REQKEY_DEFL_GROUP_KEYRING:
1285 default:
1286 ret = -EINVAL;
1287 goto error;
1288 }
1289
1290set:
1291 new->jit_keyring = reqkey_defl;
1292 commit_creds(new);
1293 return old_setting;
1294error:
1295 abort_creds(new);
1296 return ret;
1297}
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311long keyctl_set_timeout(key_serial_t id, unsigned timeout)
1312{
1313 struct key *key, *instkey;
1314 key_ref_t key_ref;
1315 long ret;
1316
1317 key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL,
1318 KEY_SETATTR);
1319 if (IS_ERR(key_ref)) {
1320
1321
1322 if (PTR_ERR(key_ref) == -EACCES) {
1323 instkey = key_get_instantiation_authkey(id);
1324 if (!IS_ERR(instkey)) {
1325 key_put(instkey);
1326 key_ref = lookup_user_key(id,
1327 KEY_LOOKUP_PARTIAL,
1328 0);
1329 if (!IS_ERR(key_ref))
1330 goto okay;
1331 }
1332 }
1333
1334 ret = PTR_ERR(key_ref);
1335 goto error;
1336 }
1337
1338okay:
1339 key = key_ref_to_ptr(key_ref);
1340 key_set_timeout(key, timeout);
1341 key_put(key);
1342
1343 ret = 0;
1344error:
1345 return ret;
1346}
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365long keyctl_assume_authority(key_serial_t id)
1366{
1367 struct key *authkey;
1368 long ret;
1369
1370
1371 ret = -EINVAL;
1372 if (id < 0)
1373 goto error;
1374
1375
1376 if (id == 0) {
1377 ret = keyctl_change_reqkey_auth(NULL);
1378 goto error;
1379 }
1380
1381
1382
1383
1384
1385
1386 authkey = key_get_instantiation_authkey(id);
1387 if (IS_ERR(authkey)) {
1388 ret = PTR_ERR(authkey);
1389 goto error;
1390 }
1391
1392 ret = keyctl_change_reqkey_auth(authkey);
1393 if (ret < 0)
1394 goto error;
1395 key_put(authkey);
1396
1397 ret = authkey->serial;
1398error:
1399 return ret;
1400}
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412long keyctl_get_security(key_serial_t keyid,
1413 char __user *buffer,
1414 size_t buflen)
1415{
1416 struct key *key, *instkey;
1417 key_ref_t key_ref;
1418 char *context;
1419 long ret;
1420
1421 key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW);
1422 if (IS_ERR(key_ref)) {
1423 if (PTR_ERR(key_ref) != -EACCES)
1424 return PTR_ERR(key_ref);
1425
1426
1427
1428 instkey = key_get_instantiation_authkey(keyid);
1429 if (IS_ERR(instkey))
1430 return PTR_ERR(instkey);
1431 key_put(instkey);
1432
1433 key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0);
1434 if (IS_ERR(key_ref))
1435 return PTR_ERR(key_ref);
1436 }
1437
1438 key = key_ref_to_ptr(key_ref);
1439 ret = security_key_getsecurity(key, &context);
1440 if (ret == 0) {
1441
1442
1443 ret = 1;
1444 if (buffer && buflen > 0 &&
1445 copy_to_user(buffer, "", 1) != 0)
1446 ret = -EFAULT;
1447 } else if (ret > 0) {
1448
1449 if (buffer && buflen > 0) {
1450 if (buflen > ret)
1451 buflen = ret;
1452
1453 if (copy_to_user(buffer, context, buflen) != 0)
1454 ret = -EFAULT;
1455 }
1456
1457 kfree(context);
1458 }
1459
1460 key_ref_put(key_ref);
1461 return ret;
1462}
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476long keyctl_session_to_parent(void)
1477{
1478 struct task_struct *me, *parent;
1479 const struct cred *mycred, *pcred;
1480 struct callback_head *newwork, *oldwork;
1481 key_ref_t keyring_r;
1482 struct cred *cred;
1483 int ret;
1484
1485 keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_LINK);
1486 if (IS_ERR(keyring_r))
1487 return PTR_ERR(keyring_r);
1488
1489 ret = -ENOMEM;
1490
1491
1492
1493
1494 cred = cred_alloc_blank();
1495 if (!cred)
1496 goto error_keyring;
1497 newwork = &cred->rcu;
1498
1499 cred->session_keyring = key_ref_to_ptr(keyring_r);
1500 keyring_r = NULL;
1501 init_task_work(newwork, key_change_session_keyring);
1502
1503 me = current;
1504 rcu_read_lock();
1505 write_lock_irq(&tasklist_lock);
1506
1507 ret = -EPERM;
1508 oldwork = NULL;
1509 parent = me->real_parent;
1510
1511
1512 if (parent->pid <= 1 || !parent->mm)
1513 goto unlock;
1514
1515
1516 if (!thread_group_empty(parent))
1517 goto unlock;
1518
1519
1520
1521 mycred = current_cred();
1522 pcred = __task_cred(parent);
1523 if (mycred == pcred ||
1524 mycred->session_keyring == pcred->session_keyring) {
1525 ret = 0;
1526 goto unlock;
1527 }
1528
1529
1530
1531 if (!uid_eq(pcred->uid, mycred->euid) ||
1532 !uid_eq(pcred->euid, mycred->euid) ||
1533 !uid_eq(pcred->suid, mycred->euid) ||
1534 !gid_eq(pcred->gid, mycred->egid) ||
1535 !gid_eq(pcred->egid, mycred->egid) ||
1536 !gid_eq(pcred->sgid, mycred->egid))
1537 goto unlock;
1538
1539
1540 if ((pcred->session_keyring &&
1541 !uid_eq(pcred->session_keyring->uid, mycred->euid)) ||
1542 !uid_eq(mycred->session_keyring->uid, mycred->euid))
1543 goto unlock;
1544
1545
1546 oldwork = task_work_cancel(parent, key_change_session_keyring);
1547
1548
1549
1550 ret = task_work_add(parent, newwork, true);
1551 if (!ret)
1552 newwork = NULL;
1553unlock:
1554 write_unlock_irq(&tasklist_lock);
1555 rcu_read_unlock();
1556 if (oldwork)
1557 put_cred(container_of(oldwork, struct cred, rcu));
1558 if (newwork)
1559 put_cred(cred);
1560 return ret;
1561
1562error_keyring:
1563 key_ref_put(keyring_r);
1564 return ret;
1565}
1566
1567
1568
1569
1570SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3,
1571 unsigned long, arg4, unsigned long, arg5)
1572{
1573 switch (option) {
1574 case KEYCTL_GET_KEYRING_ID:
1575 return keyctl_get_keyring_ID((key_serial_t) arg2,
1576 (int) arg3);
1577
1578 case KEYCTL_JOIN_SESSION_KEYRING:
1579 return keyctl_join_session_keyring((const char __user *) arg2);
1580
1581 case KEYCTL_UPDATE:
1582 return keyctl_update_key((key_serial_t) arg2,
1583 (const void __user *) arg3,
1584 (size_t) arg4);
1585
1586 case KEYCTL_REVOKE:
1587 return keyctl_revoke_key((key_serial_t) arg2);
1588
1589 case KEYCTL_DESCRIBE:
1590 return keyctl_describe_key((key_serial_t) arg2,
1591 (char __user *) arg3,
1592 (unsigned) arg4);
1593
1594 case KEYCTL_CLEAR:
1595 return keyctl_keyring_clear((key_serial_t) arg2);
1596
1597 case KEYCTL_LINK:
1598 return keyctl_keyring_link((key_serial_t) arg2,
1599 (key_serial_t) arg3);
1600
1601 case KEYCTL_UNLINK:
1602 return keyctl_keyring_unlink((key_serial_t) arg2,
1603 (key_serial_t) arg3);
1604
1605 case KEYCTL_SEARCH:
1606 return keyctl_keyring_search((key_serial_t) arg2,
1607 (const char __user *) arg3,
1608 (const char __user *) arg4,
1609 (key_serial_t) arg5);
1610
1611 case KEYCTL_READ:
1612 return keyctl_read_key((key_serial_t) arg2,
1613 (char __user *) arg3,
1614 (size_t) arg4);
1615
1616 case KEYCTL_CHOWN:
1617 return keyctl_chown_key((key_serial_t) arg2,
1618 (uid_t) arg3,
1619 (gid_t) arg4);
1620
1621 case KEYCTL_SETPERM:
1622 return keyctl_setperm_key((key_serial_t) arg2,
1623 (key_perm_t) arg3);
1624
1625 case KEYCTL_INSTANTIATE:
1626 return keyctl_instantiate_key((key_serial_t) arg2,
1627 (const void __user *) arg3,
1628 (size_t) arg4,
1629 (key_serial_t) arg5);
1630
1631 case KEYCTL_NEGATE:
1632 return keyctl_negate_key((key_serial_t) arg2,
1633 (unsigned) arg3,
1634 (key_serial_t) arg4);
1635
1636 case KEYCTL_SET_REQKEY_KEYRING:
1637 return keyctl_set_reqkey_keyring(arg2);
1638
1639 case KEYCTL_SET_TIMEOUT:
1640 return keyctl_set_timeout((key_serial_t) arg2,
1641 (unsigned) arg3);
1642
1643 case KEYCTL_ASSUME_AUTHORITY:
1644 return keyctl_assume_authority((key_serial_t) arg2);
1645
1646 case KEYCTL_GET_SECURITY:
1647 return keyctl_get_security((key_serial_t) arg2,
1648 (char __user *) arg3,
1649 (size_t) arg4);
1650
1651 case KEYCTL_SESSION_TO_PARENT:
1652 return keyctl_session_to_parent();
1653
1654 case KEYCTL_REJECT:
1655 return keyctl_reject_key((key_serial_t) arg2,
1656 (unsigned) arg3,
1657 (unsigned) arg4,
1658 (key_serial_t) arg5);
1659
1660 case KEYCTL_INSTANTIATE_IOV:
1661 return keyctl_instantiate_key_iov(
1662 (key_serial_t) arg2,
1663 (const struct iovec __user *) arg3,
1664 (unsigned) arg4,
1665 (key_serial_t) arg5);
1666
1667 case KEYCTL_INVALIDATE:
1668 return keyctl_invalidate_key((key_serial_t) arg2);
1669
1670 default:
1671 return -EOPNOTSUPP;
1672 }
1673}
1674