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12#include <linux/init.h>
13#include <linux/sched.h>
14#include <linux/sched/task.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/cred.h>
22#include <linux/string.h>
23#include <linux/err.h>
24#include <linux/vmalloc.h>
25#include <linux/security.h>
26#include <linux/uio.h>
27#include <linux/uaccess.h>
28#include <keys/request_key_auth-type.h>
29#include "internal.h"
30
31#define KEY_MAX_DESC_SIZE 4096
32
33static int key_get_type_from_user(char *type,
34 const char __user *_type,
35 unsigned len)
36{
37 int ret;
38
39 ret = strncpy_from_user(type, _type, len);
40 if (ret < 0)
41 return ret;
42 if (ret == 0 || ret >= len)
43 return -EINVAL;
44 if (type[0] == '.')
45 return -EPERM;
46 type[len - 1] = '\0';
47 return 0;
48}
49
50
51
52
53
54
55
56
57
58
59
60
61
62SYSCALL_DEFINE5(add_key, const char __user *, _type,
63 const char __user *, _description,
64 const void __user *, _payload,
65 size_t, plen,
66 key_serial_t, ringid)
67{
68 key_ref_t keyring_ref, key_ref;
69 char type[32], *description;
70 void *payload;
71 long ret;
72
73 ret = -EINVAL;
74 if (plen > 1024 * 1024 - 1)
75 goto error;
76
77
78 ret = key_get_type_from_user(type, _type, sizeof(type));
79 if (ret < 0)
80 goto error;
81
82 description = NULL;
83 if (_description) {
84 description = strndup_user(_description, KEY_MAX_DESC_SIZE);
85 if (IS_ERR(description)) {
86 ret = PTR_ERR(description);
87 goto error;
88 }
89 if (!*description) {
90 kfree(description);
91 description = NULL;
92 } else if ((description[0] == '.') &&
93 (strncmp(type, "keyring", 7) == 0)) {
94 ret = -EPERM;
95 goto error2;
96 }
97 }
98
99
100 payload = NULL;
101
102 if (plen) {
103 ret = -ENOMEM;
104 payload = kvmalloc(plen, GFP_KERNEL);
105 if (!payload)
106 goto error2;
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_NEED_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 (payload) {
136 memzero_explicit(payload, plen);
137 kvfree(payload);
138 }
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, KEY_MAX_DESC_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_NEED_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_NEED_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
278
279long keyctl_join_session_keyring(const char __user *_name)
280{
281 char *name;
282 long ret;
283
284
285 name = NULL;
286 if (_name) {
287 name = strndup_user(_name, KEY_MAX_DESC_SIZE);
288 if (IS_ERR(name)) {
289 ret = PTR_ERR(name);
290 goto error;
291 }
292
293 ret = -EPERM;
294 if (name[0] == '.')
295 goto error_name;
296 }
297
298
299 ret = join_session_keyring(name);
300error_name:
301 kfree(name);
302error:
303 return ret;
304}
305
306
307
308
309
310
311
312
313
314
315
316long keyctl_update_key(key_serial_t id,
317 const void __user *_payload,
318 size_t plen)
319{
320 key_ref_t key_ref;
321 void *payload;
322 long ret;
323
324 ret = -EINVAL;
325 if (plen > PAGE_SIZE)
326 goto error;
327
328
329 payload = NULL;
330 if (plen) {
331 ret = -ENOMEM;
332 payload = kmalloc(plen, GFP_KERNEL);
333 if (!payload)
334 goto error;
335
336 ret = -EFAULT;
337 if (copy_from_user(payload, _payload, plen) != 0)
338 goto error2;
339 }
340
341
342 key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE);
343 if (IS_ERR(key_ref)) {
344 ret = PTR_ERR(key_ref);
345 goto error2;
346 }
347
348
349 ret = key_update(key_ref, payload, plen);
350
351 key_ref_put(key_ref);
352error2:
353 kzfree(payload);
354error:
355 return ret;
356}
357
358
359
360
361
362
363
364
365
366
367
368
369
370long keyctl_revoke_key(key_serial_t id)
371{
372 key_ref_t key_ref;
373 struct key *key;
374 long ret;
375
376 key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE);
377 if (IS_ERR(key_ref)) {
378 ret = PTR_ERR(key_ref);
379 if (ret != -EACCES)
380 goto error;
381 key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR);
382 if (IS_ERR(key_ref)) {
383 ret = PTR_ERR(key_ref);
384 goto error;
385 }
386 }
387
388 key = key_ref_to_ptr(key_ref);
389 ret = 0;
390 if (test_bit(KEY_FLAG_KEEP, &key->flags))
391 ret = -EPERM;
392 else
393 key_revoke(key);
394
395 key_ref_put(key_ref);
396error:
397 return ret;
398}
399
400
401
402
403
404
405
406
407
408
409
410
411long keyctl_invalidate_key(key_serial_t id)
412{
413 key_ref_t key_ref;
414 struct key *key;
415 long ret;
416
417 kenter("%d", id);
418
419 key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH);
420 if (IS_ERR(key_ref)) {
421 ret = PTR_ERR(key_ref);
422
423
424 if (capable(CAP_SYS_ADMIN)) {
425 key_ref = lookup_user_key(id, 0, 0);
426 if (IS_ERR(key_ref))
427 goto error;
428 if (test_bit(KEY_FLAG_ROOT_CAN_INVAL,
429 &key_ref_to_ptr(key_ref)->flags))
430 goto invalidate;
431 goto error_put;
432 }
433
434 goto error;
435 }
436
437invalidate:
438 key = key_ref_to_ptr(key_ref);
439 ret = 0;
440 if (test_bit(KEY_FLAG_KEEP, &key->flags))
441 ret = -EPERM;
442 else
443 key_invalidate(key);
444error_put:
445 key_ref_put(key_ref);
446error:
447 kleave(" = %ld", ret);
448 return ret;
449}
450
451
452
453
454
455
456
457
458long keyctl_keyring_clear(key_serial_t ringid)
459{
460 key_ref_t keyring_ref;
461 struct key *keyring;
462 long ret;
463
464 keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
465 if (IS_ERR(keyring_ref)) {
466 ret = PTR_ERR(keyring_ref);
467
468
469 if (capable(CAP_SYS_ADMIN)) {
470 keyring_ref = lookup_user_key(ringid, 0, 0);
471 if (IS_ERR(keyring_ref))
472 goto error;
473 if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR,
474 &key_ref_to_ptr(keyring_ref)->flags))
475 goto clear;
476 goto error_put;
477 }
478
479 goto error;
480 }
481
482clear:
483 keyring = key_ref_to_ptr(keyring_ref);
484 if (test_bit(KEY_FLAG_KEEP, &keyring->flags))
485 ret = -EPERM;
486 else
487 ret = keyring_clear(keyring);
488error_put:
489 key_ref_put(keyring_ref);
490error:
491 return ret;
492}
493
494
495
496
497
498
499
500
501
502
503
504
505long keyctl_keyring_link(key_serial_t id, key_serial_t ringid)
506{
507 key_ref_t keyring_ref, key_ref;
508 long ret;
509
510 keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
511 if (IS_ERR(keyring_ref)) {
512 ret = PTR_ERR(keyring_ref);
513 goto error;
514 }
515
516 key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK);
517 if (IS_ERR(key_ref)) {
518 ret = PTR_ERR(key_ref);
519 goto error2;
520 }
521
522 ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref));
523
524 key_ref_put(key_ref);
525error2:
526 key_ref_put(keyring_ref);
527error:
528 return ret;
529}
530
531
532
533
534
535
536
537
538
539
540
541
542long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid)
543{
544 key_ref_t keyring_ref, key_ref;
545 struct key *keyring, *key;
546 long ret;
547
548 keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_WRITE);
549 if (IS_ERR(keyring_ref)) {
550 ret = PTR_ERR(keyring_ref);
551 goto error;
552 }
553
554 key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0);
555 if (IS_ERR(key_ref)) {
556 ret = PTR_ERR(key_ref);
557 goto error2;
558 }
559
560 keyring = key_ref_to_ptr(keyring_ref);
561 key = key_ref_to_ptr(key_ref);
562 if (test_bit(KEY_FLAG_KEEP, &keyring->flags) &&
563 test_bit(KEY_FLAG_KEEP, &key->flags))
564 ret = -EPERM;
565 else
566 ret = key_unlink(keyring, key);
567
568 key_ref_put(key_ref);
569error2:
570 key_ref_put(keyring_ref);
571error:
572 return ret;
573}
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588long keyctl_describe_key(key_serial_t keyid,
589 char __user *buffer,
590 size_t buflen)
591{
592 struct key *key, *instkey;
593 key_ref_t key_ref;
594 char *infobuf;
595 long ret;
596 int desclen, infolen;
597
598 key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW);
599 if (IS_ERR(key_ref)) {
600
601
602 if (PTR_ERR(key_ref) == -EACCES) {
603 instkey = key_get_instantiation_authkey(keyid);
604 if (!IS_ERR(instkey)) {
605 key_put(instkey);
606 key_ref = lookup_user_key(keyid,
607 KEY_LOOKUP_PARTIAL,
608 0);
609 if (!IS_ERR(key_ref))
610 goto okay;
611 }
612 }
613
614 ret = PTR_ERR(key_ref);
615 goto error;
616 }
617
618okay:
619 key = key_ref_to_ptr(key_ref);
620 desclen = strlen(key->description);
621
622
623 ret = -ENOMEM;
624 infobuf = kasprintf(GFP_KERNEL,
625 "%s;%d;%d;%08x;",
626 key->type->name,
627 from_kuid_munged(current_user_ns(), key->uid),
628 from_kgid_munged(current_user_ns(), key->gid),
629 key->perm);
630 if (!infobuf)
631 goto error2;
632 infolen = strlen(infobuf);
633 ret = infolen + desclen + 1;
634
635
636 if (buffer && buflen >= ret) {
637 if (copy_to_user(buffer, infobuf, infolen) != 0 ||
638 copy_to_user(buffer + infolen, key->description,
639 desclen + 1) != 0)
640 ret = -EFAULT;
641 }
642
643 kfree(infobuf);
644error2:
645 key_ref_put(key_ref);
646error:
647 return ret;
648}
649
650
651
652
653
654
655
656
657
658
659
660long keyctl_keyring_search(key_serial_t ringid,
661 const char __user *_type,
662 const char __user *_description,
663 key_serial_t destringid)
664{
665 struct key_type *ktype;
666 key_ref_t keyring_ref, key_ref, dest_ref;
667 char type[32], *description;
668 long ret;
669
670
671 ret = key_get_type_from_user(type, _type, sizeof(type));
672 if (ret < 0)
673 goto error;
674
675 description = strndup_user(_description, KEY_MAX_DESC_SIZE);
676 if (IS_ERR(description)) {
677 ret = PTR_ERR(description);
678 goto error;
679 }
680
681
682 keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_SEARCH);
683 if (IS_ERR(keyring_ref)) {
684 ret = PTR_ERR(keyring_ref);
685 goto error2;
686 }
687
688
689 dest_ref = NULL;
690 if (destringid) {
691 dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE,
692 KEY_NEED_WRITE);
693 if (IS_ERR(dest_ref)) {
694 ret = PTR_ERR(dest_ref);
695 goto error3;
696 }
697 }
698
699
700 ktype = key_type_lookup(type);
701 if (IS_ERR(ktype)) {
702 ret = PTR_ERR(ktype);
703 goto error4;
704 }
705
706
707 key_ref = keyring_search(keyring_ref, ktype, description);
708 if (IS_ERR(key_ref)) {
709 ret = PTR_ERR(key_ref);
710
711
712 if (ret == -EAGAIN)
713 ret = -ENOKEY;
714 goto error5;
715 }
716
717
718 if (dest_ref) {
719 ret = key_permission(key_ref, KEY_NEED_LINK);
720 if (ret < 0)
721 goto error6;
722
723 ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref));
724 if (ret < 0)
725 goto error6;
726 }
727
728 ret = key_ref_to_ptr(key_ref)->serial;
729
730error6:
731 key_ref_put(key_ref);
732error5:
733 key_type_put(ktype);
734error4:
735 key_ref_put(dest_ref);
736error3:
737 key_ref_put(keyring_ref);
738error2:
739 kfree(description);
740error:
741 return ret;
742}
743
744
745
746
747
748
749
750
751
752
753
754long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen)
755{
756 struct key *key;
757 key_ref_t key_ref;
758 long ret;
759
760
761 key_ref = lookup_user_key(keyid, 0, 0);
762 if (IS_ERR(key_ref)) {
763 ret = -ENOKEY;
764 goto error;
765 }
766
767 key = key_ref_to_ptr(key_ref);
768
769 ret = key_read_state(key);
770 if (ret < 0)
771 goto error2;
772
773
774 ret = key_permission(key_ref, KEY_NEED_READ);
775 if (ret == 0)
776 goto can_read_key;
777 if (ret != -EACCES)
778 goto error2;
779
780
781
782
783
784 if (!is_key_possessed(key_ref)) {
785 ret = -EACCES;
786 goto error2;
787 }
788
789
790can_read_key:
791 ret = -EOPNOTSUPP;
792 if (key->type->read) {
793
794
795
796 down_read(&key->sem);
797 ret = key_validate(key);
798 if (ret == 0)
799 ret = key->type->read(key, buffer, buflen);
800 up_read(&key->sem);
801 }
802
803error2:
804 key_put(key);
805error:
806 return ret;
807}
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group)
825{
826 struct key_user *newowner, *zapowner = NULL;
827 struct key *key;
828 key_ref_t key_ref;
829 long ret;
830 kuid_t uid;
831 kgid_t gid;
832
833 uid = make_kuid(current_user_ns(), user);
834 gid = make_kgid(current_user_ns(), group);
835 ret = -EINVAL;
836 if ((user != (uid_t) -1) && !uid_valid(uid))
837 goto error;
838 if ((group != (gid_t) -1) && !gid_valid(gid))
839 goto error;
840
841 ret = 0;
842 if (user == (uid_t) -1 && group == (gid_t) -1)
843 goto error;
844
845 key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL,
846 KEY_NEED_SETATTR);
847 if (IS_ERR(key_ref)) {
848 ret = PTR_ERR(key_ref);
849 goto error;
850 }
851
852 key = key_ref_to_ptr(key_ref);
853
854
855 ret = -EACCES;
856 down_write(&key->sem);
857
858 if (!capable(CAP_SYS_ADMIN)) {
859
860 if (user != (uid_t) -1 && !uid_eq(key->uid, uid))
861 goto error_put;
862
863
864
865 if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid))
866 goto error_put;
867 }
868
869
870 if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) {
871 ret = -ENOMEM;
872 newowner = key_user_lookup(uid);
873 if (!newowner)
874 goto error_put;
875
876
877 if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) {
878 unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ?
879 key_quota_root_maxkeys : key_quota_maxkeys;
880 unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ?
881 key_quota_root_maxbytes : key_quota_maxbytes;
882
883 spin_lock(&newowner->lock);
884 if (newowner->qnkeys + 1 >= maxkeys ||
885 newowner->qnbytes + key->quotalen >= maxbytes ||
886 newowner->qnbytes + key->quotalen <
887 newowner->qnbytes)
888 goto quota_overrun;
889
890 newowner->qnkeys++;
891 newowner->qnbytes += key->quotalen;
892 spin_unlock(&newowner->lock);
893
894 spin_lock(&key->user->lock);
895 key->user->qnkeys--;
896 key->user->qnbytes -= key->quotalen;
897 spin_unlock(&key->user->lock);
898 }
899
900 atomic_dec(&key->user->nkeys);
901 atomic_inc(&newowner->nkeys);
902
903 if (key->state != KEY_IS_UNINSTANTIATED) {
904 atomic_dec(&key->user->nikeys);
905 atomic_inc(&newowner->nikeys);
906 }
907
908 zapowner = key->user;
909 key->user = newowner;
910 key->uid = uid;
911 }
912
913
914 if (group != (gid_t) -1)
915 key->gid = gid;
916
917 ret = 0;
918
919error_put:
920 up_write(&key->sem);
921 key_put(key);
922 if (zapowner)
923 key_user_put(zapowner);
924error:
925 return ret;
926
927quota_overrun:
928 spin_unlock(&newowner->lock);
929 zapowner = newowner;
930 ret = -EDQUOT;
931 goto error_put;
932}
933
934
935
936
937
938
939
940
941long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
942{
943 struct key *key;
944 key_ref_t key_ref;
945 long ret;
946
947 ret = -EINVAL;
948 if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL))
949 goto error;
950
951 key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL,
952 KEY_NEED_SETATTR);
953 if (IS_ERR(key_ref)) {
954 ret = PTR_ERR(key_ref);
955 goto error;
956 }
957
958 key = key_ref_to_ptr(key_ref);
959
960
961 ret = -EACCES;
962 down_write(&key->sem);
963
964
965 if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) {
966 key->perm = perm;
967 ret = 0;
968 }
969
970 up_write(&key->sem);
971 key_put(key);
972error:
973 return ret;
974}
975
976
977
978
979
980static long get_instantiation_keyring(key_serial_t ringid,
981 struct request_key_auth *rka,
982 struct key **_dest_keyring)
983{
984 key_ref_t dkref;
985
986 *_dest_keyring = NULL;
987
988
989 if (ringid == 0)
990 return 0;
991
992
993 if (ringid > 0) {
994 dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
995 if (IS_ERR(dkref))
996 return PTR_ERR(dkref);
997 *_dest_keyring = key_ref_to_ptr(dkref);
998 return 0;
999 }
1000
1001 if (ringid == KEY_SPEC_REQKEY_AUTH_KEY)
1002 return -EINVAL;
1003
1004
1005
1006 if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) {
1007 *_dest_keyring = key_get(rka->dest_keyring);
1008 return 0;
1009 }
1010
1011 return -ENOKEY;
1012}
1013
1014
1015
1016
1017static int keyctl_change_reqkey_auth(struct key *key)
1018{
1019 struct cred *new;
1020
1021 new = prepare_creds();
1022 if (!new)
1023 return -ENOMEM;
1024
1025 key_put(new->request_key_auth);
1026 new->request_key_auth = key_get(key);
1027
1028 return commit_creds(new);
1029}
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040long keyctl_instantiate_key_common(key_serial_t id,
1041 struct iov_iter *from,
1042 key_serial_t ringid)
1043{
1044 const struct cred *cred = current_cred();
1045 struct request_key_auth *rka;
1046 struct key *instkey, *dest_keyring;
1047 size_t plen = from ? iov_iter_count(from) : 0;
1048 void *payload;
1049 long ret;
1050
1051 kenter("%d,,%zu,%d", id, plen, ringid);
1052
1053 if (!plen)
1054 from = NULL;
1055
1056 ret = -EINVAL;
1057 if (plen > 1024 * 1024 - 1)
1058 goto error;
1059
1060
1061
1062 ret = -EPERM;
1063 instkey = cred->request_key_auth;
1064 if (!instkey)
1065 goto error;
1066
1067 rka = instkey->payload.data[0];
1068 if (rka->target_key->serial != id)
1069 goto error;
1070
1071
1072 payload = NULL;
1073
1074 if (from) {
1075 ret = -ENOMEM;
1076 payload = kvmalloc(plen, GFP_KERNEL);
1077 if (!payload)
1078 goto error;
1079
1080 ret = -EFAULT;
1081 if (!copy_from_iter_full(payload, plen, from))
1082 goto error2;
1083 }
1084
1085
1086
1087 ret = get_instantiation_keyring(ringid, rka, &dest_keyring);
1088 if (ret < 0)
1089 goto error2;
1090
1091
1092 ret = key_instantiate_and_link(rka->target_key, payload, plen,
1093 dest_keyring, instkey);
1094
1095 key_put(dest_keyring);
1096
1097
1098
1099 if (ret == 0)
1100 keyctl_change_reqkey_auth(NULL);
1101
1102error2:
1103 if (payload) {
1104 memzero_explicit(payload, plen);
1105 kvfree(payload);
1106 }
1107error:
1108 return ret;
1109}
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120long keyctl_instantiate_key(key_serial_t id,
1121 const void __user *_payload,
1122 size_t plen,
1123 key_serial_t ringid)
1124{
1125 if (_payload && plen) {
1126 struct iovec iov;
1127 struct iov_iter from;
1128 int ret;
1129
1130 ret = import_single_range(WRITE, (void __user *)_payload, plen,
1131 &iov, &from);
1132 if (unlikely(ret))
1133 return ret;
1134
1135 return keyctl_instantiate_key_common(id, &from, ringid);
1136 }
1137
1138 return keyctl_instantiate_key_common(id, NULL, ringid);
1139}
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150long keyctl_instantiate_key_iov(key_serial_t id,
1151 const struct iovec __user *_payload_iov,
1152 unsigned ioc,
1153 key_serial_t ringid)
1154{
1155 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1156 struct iov_iter from;
1157 long ret;
1158
1159 if (!_payload_iov)
1160 ioc = 0;
1161
1162 ret = import_iovec(WRITE, _payload_iov, ioc,
1163 ARRAY_SIZE(iovstack), &iov, &from);
1164 if (ret < 0)
1165 return ret;
1166 ret = keyctl_instantiate_key_common(id, &from, ringid);
1167 kfree(iov);
1168 return ret;
1169}
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
1187{
1188 return keyctl_reject_key(id, timeout, ENOKEY, ringid);
1189}
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error,
1207 key_serial_t ringid)
1208{
1209 const struct cred *cred = current_cred();
1210 struct request_key_auth *rka;
1211 struct key *instkey, *dest_keyring;
1212 long ret;
1213
1214 kenter("%d,%u,%u,%d", id, timeout, error, ringid);
1215
1216
1217 if (error <= 0 ||
1218 error >= MAX_ERRNO ||
1219 error == ERESTARTSYS ||
1220 error == ERESTARTNOINTR ||
1221 error == ERESTARTNOHAND ||
1222 error == ERESTART_RESTARTBLOCK)
1223 return -EINVAL;
1224
1225
1226
1227 ret = -EPERM;
1228 instkey = cred->request_key_auth;
1229 if (!instkey)
1230 goto error;
1231
1232 rka = instkey->payload.data[0];
1233 if (rka->target_key->serial != id)
1234 goto error;
1235
1236
1237
1238 ret = get_instantiation_keyring(ringid, rka, &dest_keyring);
1239 if (ret < 0)
1240 goto error;
1241
1242
1243 ret = key_reject_and_link(rka->target_key, timeout, error,
1244 dest_keyring, instkey);
1245
1246 key_put(dest_keyring);
1247
1248
1249
1250 if (ret == 0)
1251 keyctl_change_reqkey_auth(NULL);
1252
1253error:
1254 return ret;
1255}
1256
1257
1258
1259
1260
1261
1262
1263
1264long keyctl_set_reqkey_keyring(int reqkey_defl)
1265{
1266 struct cred *new;
1267 int ret, old_setting;
1268
1269 old_setting = current_cred_xxx(jit_keyring);
1270
1271 if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE)
1272 return old_setting;
1273
1274 new = prepare_creds();
1275 if (!new)
1276 return -ENOMEM;
1277
1278 switch (reqkey_defl) {
1279 case KEY_REQKEY_DEFL_THREAD_KEYRING:
1280 ret = install_thread_keyring_to_cred(new);
1281 if (ret < 0)
1282 goto error;
1283 goto set;
1284
1285 case KEY_REQKEY_DEFL_PROCESS_KEYRING:
1286 ret = install_process_keyring_to_cred(new);
1287 if (ret < 0)
1288 goto error;
1289 goto set;
1290
1291 case KEY_REQKEY_DEFL_DEFAULT:
1292 case KEY_REQKEY_DEFL_SESSION_KEYRING:
1293 case KEY_REQKEY_DEFL_USER_KEYRING:
1294 case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
1295 case KEY_REQKEY_DEFL_REQUESTOR_KEYRING:
1296 goto set;
1297
1298 case KEY_REQKEY_DEFL_NO_CHANGE:
1299 case KEY_REQKEY_DEFL_GROUP_KEYRING:
1300 default:
1301 ret = -EINVAL;
1302 goto error;
1303 }
1304
1305set:
1306 new->jit_keyring = reqkey_defl;
1307 commit_creds(new);
1308 return old_setting;
1309error:
1310 abort_creds(new);
1311 return ret;
1312}
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328long keyctl_set_timeout(key_serial_t id, unsigned timeout)
1329{
1330 struct key *key, *instkey;
1331 key_ref_t key_ref;
1332 long ret;
1333
1334 key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL,
1335 KEY_NEED_SETATTR);
1336 if (IS_ERR(key_ref)) {
1337
1338
1339 if (PTR_ERR(key_ref) == -EACCES) {
1340 instkey = key_get_instantiation_authkey(id);
1341 if (!IS_ERR(instkey)) {
1342 key_put(instkey);
1343 key_ref = lookup_user_key(id,
1344 KEY_LOOKUP_PARTIAL,
1345 0);
1346 if (!IS_ERR(key_ref))
1347 goto okay;
1348 }
1349 }
1350
1351 ret = PTR_ERR(key_ref);
1352 goto error;
1353 }
1354
1355okay:
1356 key = key_ref_to_ptr(key_ref);
1357 ret = 0;
1358 if (test_bit(KEY_FLAG_KEEP, &key->flags))
1359 ret = -EPERM;
1360 else
1361 key_set_timeout(key, timeout);
1362 key_put(key);
1363
1364error:
1365 return ret;
1366}
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385long keyctl_assume_authority(key_serial_t id)
1386{
1387 struct key *authkey;
1388 long ret;
1389
1390
1391 ret = -EINVAL;
1392 if (id < 0)
1393 goto error;
1394
1395
1396 if (id == 0) {
1397 ret = keyctl_change_reqkey_auth(NULL);
1398 goto error;
1399 }
1400
1401
1402
1403
1404
1405
1406 authkey = key_get_instantiation_authkey(id);
1407 if (IS_ERR(authkey)) {
1408 ret = PTR_ERR(authkey);
1409 goto error;
1410 }
1411
1412 ret = keyctl_change_reqkey_auth(authkey);
1413 if (ret == 0)
1414 ret = authkey->serial;
1415 key_put(authkey);
1416error:
1417 return ret;
1418}
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430long keyctl_get_security(key_serial_t keyid,
1431 char __user *buffer,
1432 size_t buflen)
1433{
1434 struct key *key, *instkey;
1435 key_ref_t key_ref;
1436 char *context;
1437 long ret;
1438
1439 key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW);
1440 if (IS_ERR(key_ref)) {
1441 if (PTR_ERR(key_ref) != -EACCES)
1442 return PTR_ERR(key_ref);
1443
1444
1445
1446 instkey = key_get_instantiation_authkey(keyid);
1447 if (IS_ERR(instkey))
1448 return PTR_ERR(instkey);
1449 key_put(instkey);
1450
1451 key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0);
1452 if (IS_ERR(key_ref))
1453 return PTR_ERR(key_ref);
1454 }
1455
1456 key = key_ref_to_ptr(key_ref);
1457 ret = security_key_getsecurity(key, &context);
1458 if (ret == 0) {
1459
1460
1461 ret = 1;
1462 if (buffer && buflen > 0 &&
1463 copy_to_user(buffer, "", 1) != 0)
1464 ret = -EFAULT;
1465 } else if (ret > 0) {
1466
1467 if (buffer && buflen > 0) {
1468 if (buflen > ret)
1469 buflen = ret;
1470
1471 if (copy_to_user(buffer, context, buflen) != 0)
1472 ret = -EFAULT;
1473 }
1474
1475 kfree(context);
1476 }
1477
1478 key_ref_put(key_ref);
1479 return ret;
1480}
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494long keyctl_session_to_parent(void)
1495{
1496 struct task_struct *me, *parent;
1497 const struct cred *mycred, *pcred;
1498 struct callback_head *newwork, *oldwork;
1499 key_ref_t keyring_r;
1500 struct cred *cred;
1501 int ret;
1502
1503 keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_NEED_LINK);
1504 if (IS_ERR(keyring_r))
1505 return PTR_ERR(keyring_r);
1506
1507 ret = -ENOMEM;
1508
1509
1510
1511
1512 cred = cred_alloc_blank();
1513 if (!cred)
1514 goto error_keyring;
1515 newwork = &cred->rcu;
1516
1517 cred->session_keyring = key_ref_to_ptr(keyring_r);
1518 keyring_r = NULL;
1519 init_task_work(newwork, key_change_session_keyring);
1520
1521 me = current;
1522 rcu_read_lock();
1523 write_lock_irq(&tasklist_lock);
1524
1525 ret = -EPERM;
1526 oldwork = NULL;
1527 parent = me->real_parent;
1528
1529
1530 if (parent->pid <= 1 || !parent->mm)
1531 goto unlock;
1532
1533
1534 if (!thread_group_empty(parent))
1535 goto unlock;
1536
1537
1538
1539 mycred = current_cred();
1540 pcred = __task_cred(parent);
1541 if (mycred == pcred ||
1542 mycred->session_keyring == pcred->session_keyring) {
1543 ret = 0;
1544 goto unlock;
1545 }
1546
1547
1548
1549 if (!uid_eq(pcred->uid, mycred->euid) ||
1550 !uid_eq(pcred->euid, mycred->euid) ||
1551 !uid_eq(pcred->suid, mycred->euid) ||
1552 !gid_eq(pcred->gid, mycred->egid) ||
1553 !gid_eq(pcred->egid, mycred->egid) ||
1554 !gid_eq(pcred->sgid, mycred->egid))
1555 goto unlock;
1556
1557
1558 if ((pcred->session_keyring &&
1559 !uid_eq(pcred->session_keyring->uid, mycred->euid)) ||
1560 !uid_eq(mycred->session_keyring->uid, mycred->euid))
1561 goto unlock;
1562
1563
1564 oldwork = task_work_cancel(parent, key_change_session_keyring);
1565
1566
1567
1568 ret = task_work_add(parent, newwork, true);
1569 if (!ret)
1570 newwork = NULL;
1571unlock:
1572 write_unlock_irq(&tasklist_lock);
1573 rcu_read_unlock();
1574 if (oldwork)
1575 put_cred(container_of(oldwork, struct cred, rcu));
1576 if (newwork)
1577 put_cred(cred);
1578 return ret;
1579
1580error_keyring:
1581 key_ref_put(keyring_r);
1582 return ret;
1583}
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596long keyctl_restrict_keyring(key_serial_t id, const char __user *_type,
1597 const char __user *_restriction)
1598{
1599 key_ref_t key_ref;
1600 char type[32];
1601 char *restriction = NULL;
1602 long ret;
1603
1604 key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR);
1605 if (IS_ERR(key_ref))
1606 return PTR_ERR(key_ref);
1607
1608 ret = -EINVAL;
1609 if (_type) {
1610 if (!_restriction)
1611 goto error;
1612
1613 ret = key_get_type_from_user(type, _type, sizeof(type));
1614 if (ret < 0)
1615 goto error;
1616
1617 restriction = strndup_user(_restriction, PAGE_SIZE);
1618 if (IS_ERR(restriction)) {
1619 ret = PTR_ERR(restriction);
1620 goto error;
1621 }
1622 } else {
1623 if (_restriction)
1624 goto error;
1625 }
1626
1627 ret = keyring_restrict(key_ref, _type ? type : NULL, restriction);
1628 kfree(restriction);
1629error:
1630 key_ref_put(key_ref);
1631 return ret;
1632}
1633
1634
1635
1636
1637SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3,
1638 unsigned long, arg4, unsigned long, arg5)
1639{
1640 switch (option) {
1641 case KEYCTL_GET_KEYRING_ID:
1642 return keyctl_get_keyring_ID((key_serial_t) arg2,
1643 (int) arg3);
1644
1645 case KEYCTL_JOIN_SESSION_KEYRING:
1646 return keyctl_join_session_keyring((const char __user *) arg2);
1647
1648 case KEYCTL_UPDATE:
1649 return keyctl_update_key((key_serial_t) arg2,
1650 (const void __user *) arg3,
1651 (size_t) arg4);
1652
1653 case KEYCTL_REVOKE:
1654 return keyctl_revoke_key((key_serial_t) arg2);
1655
1656 case KEYCTL_DESCRIBE:
1657 return keyctl_describe_key((key_serial_t) arg2,
1658 (char __user *) arg3,
1659 (unsigned) arg4);
1660
1661 case KEYCTL_CLEAR:
1662 return keyctl_keyring_clear((key_serial_t) arg2);
1663
1664 case KEYCTL_LINK:
1665 return keyctl_keyring_link((key_serial_t) arg2,
1666 (key_serial_t) arg3);
1667
1668 case KEYCTL_UNLINK:
1669 return keyctl_keyring_unlink((key_serial_t) arg2,
1670 (key_serial_t) arg3);
1671
1672 case KEYCTL_SEARCH:
1673 return keyctl_keyring_search((key_serial_t) arg2,
1674 (const char __user *) arg3,
1675 (const char __user *) arg4,
1676 (key_serial_t) arg5);
1677
1678 case KEYCTL_READ:
1679 return keyctl_read_key((key_serial_t) arg2,
1680 (char __user *) arg3,
1681 (size_t) arg4);
1682
1683 case KEYCTL_CHOWN:
1684 return keyctl_chown_key((key_serial_t) arg2,
1685 (uid_t) arg3,
1686 (gid_t) arg4);
1687
1688 case KEYCTL_SETPERM:
1689 return keyctl_setperm_key((key_serial_t) arg2,
1690 (key_perm_t) arg3);
1691
1692 case KEYCTL_INSTANTIATE:
1693 return keyctl_instantiate_key((key_serial_t) arg2,
1694 (const void __user *) arg3,
1695 (size_t) arg4,
1696 (key_serial_t) arg5);
1697
1698 case KEYCTL_NEGATE:
1699 return keyctl_negate_key((key_serial_t) arg2,
1700 (unsigned) arg3,
1701 (key_serial_t) arg4);
1702
1703 case KEYCTL_SET_REQKEY_KEYRING:
1704 return keyctl_set_reqkey_keyring(arg2);
1705
1706 case KEYCTL_SET_TIMEOUT:
1707 return keyctl_set_timeout((key_serial_t) arg2,
1708 (unsigned) arg3);
1709
1710 case KEYCTL_ASSUME_AUTHORITY:
1711 return keyctl_assume_authority((key_serial_t) arg2);
1712
1713 case KEYCTL_GET_SECURITY:
1714 return keyctl_get_security((key_serial_t) arg2,
1715 (char __user *) arg3,
1716 (size_t) arg4);
1717
1718 case KEYCTL_SESSION_TO_PARENT:
1719 return keyctl_session_to_parent();
1720
1721 case KEYCTL_REJECT:
1722 return keyctl_reject_key((key_serial_t) arg2,
1723 (unsigned) arg3,
1724 (unsigned) arg4,
1725 (key_serial_t) arg5);
1726
1727 case KEYCTL_INSTANTIATE_IOV:
1728 return keyctl_instantiate_key_iov(
1729 (key_serial_t) arg2,
1730 (const struct iovec __user *) arg3,
1731 (unsigned) arg4,
1732 (key_serial_t) arg5);
1733
1734 case KEYCTL_INVALIDATE:
1735 return keyctl_invalidate_key((key_serial_t) arg2);
1736
1737 case KEYCTL_GET_PERSISTENT:
1738 return keyctl_get_persistent((uid_t)arg2, (key_serial_t)arg3);
1739
1740 case KEYCTL_DH_COMPUTE:
1741 return keyctl_dh_compute((struct keyctl_dh_params __user *) arg2,
1742 (char __user *) arg3, (size_t) arg4,
1743 (struct keyctl_kdf_params __user *) arg5);
1744
1745 case KEYCTL_RESTRICT_KEYRING:
1746 return keyctl_restrict_keyring((key_serial_t) arg2,
1747 (const char __user *) arg3,
1748 (const char __user *) arg4);
1749
1750 case KEYCTL_PKEY_QUERY:
1751 if (arg3 != 0)
1752 return -EINVAL;
1753 return keyctl_pkey_query((key_serial_t)arg2,
1754 (const char __user *)arg4,
1755 (struct keyctl_pkey_query __user *)arg5);
1756
1757 case KEYCTL_PKEY_ENCRYPT:
1758 case KEYCTL_PKEY_DECRYPT:
1759 case KEYCTL_PKEY_SIGN:
1760 return keyctl_pkey_e_d_s(
1761 option,
1762 (const struct keyctl_pkey_params __user *)arg2,
1763 (const char __user *)arg3,
1764 (const void __user *)arg4,
1765 (void __user *)arg5);
1766
1767 case KEYCTL_PKEY_VERIFY:
1768 return keyctl_pkey_verify(
1769 (const struct keyctl_pkey_params __user *)arg2,
1770 (const char __user *)arg3,
1771 (const void __user *)arg4,
1772 (const void __user *)arg5);
1773
1774 default:
1775 return -EOPNOTSUPP;
1776 }
1777}
1778