1 // SPDX-License-Identifier: LGPL-2.1+
3 * Copyright (C) International Business Machines Corp., 2007,2008
4 * Author(s): Steve French (sfrench@us.ibm.com)
5 * Copyright (C) 2020 Samsung Electronics Co., Ltd.
6 * Author(s): Namjae Jeon <linkinjeon@kernel.org>
10 #include <linux/slab.h>
11 #include <linux/string.h>
12 #include <linux/mnt_idmapping.h>
15 #include "smb_common.h"
18 #include "mgmt/share_config.h"
20 static const struct smb_sid domain = {1, 4, {0, 0, 0, 0, 0, 5},
21 {cpu_to_le32(21), cpu_to_le32(1), cpu_to_le32(2), cpu_to_le32(3),
22 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
24 /* security id for everyone/world system group */
25 static const struct smb_sid creator_owner = {
26 1, 1, {0, 0, 0, 0, 0, 3}, {0} };
27 /* security id for everyone/world system group */
28 static const struct smb_sid creator_group = {
29 1, 1, {0, 0, 0, 0, 0, 3}, {cpu_to_le32(1)} };
31 /* security id for everyone/world system group */
32 static const struct smb_sid sid_everyone = {
33 1, 1, {0, 0, 0, 0, 0, 1}, {0} };
34 /* security id for Authenticated Users system group */
35 static const struct smb_sid sid_authusers = {
36 1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} };
38 /* S-1-22-1 Unmapped Unix users */
39 static const struct smb_sid sid_unix_users = {1, 1, {0, 0, 0, 0, 0, 22},
40 {cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
42 /* S-1-22-2 Unmapped Unix groups */
43 static const struct smb_sid sid_unix_groups = { 1, 1, {0, 0, 0, 0, 0, 22},
44 {cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
47 * See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx
50 /* S-1-5-88 MS NFS and Apple style UID/GID/mode */
52 /* S-1-5-88-1 Unix uid */
53 static const struct smb_sid sid_unix_NFS_users = { 1, 2, {0, 0, 0, 0, 0, 5},
55 cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
57 /* S-1-5-88-2 Unix gid */
58 static const struct smb_sid sid_unix_NFS_groups = { 1, 2, {0, 0, 0, 0, 0, 5},
60 cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
62 /* S-1-5-88-3 Unix mode */
63 static const struct smb_sid sid_unix_NFS_mode = { 1, 2, {0, 0, 0, 0, 0, 5},
65 cpu_to_le32(3), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
68 * if the two SIDs (roughly equivalent to a UUID for a user or group) are
69 * the same returns zero, if they do not match returns non-zero.
71 int compare_sids(const struct smb_sid *ctsid, const struct smb_sid *cwsid)
74 int num_subauth, num_sat, num_saw;
79 /* compare the revision */
80 if (ctsid->revision != cwsid->revision) {
81 if (ctsid->revision > cwsid->revision)
87 /* compare all of the six auth values */
88 for (i = 0; i < NUM_AUTHS; ++i) {
89 if (ctsid->authority[i] != cwsid->authority[i]) {
90 if (ctsid->authority[i] > cwsid->authority[i])
97 /* compare all of the subauth values if any */
98 num_sat = ctsid->num_subauth;
99 num_saw = cwsid->num_subauth;
100 num_subauth = min(num_sat, num_saw);
102 for (i = 0; i < num_subauth; ++i) {
103 if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) {
104 if (le32_to_cpu(ctsid->sub_auth[i]) >
105 le32_to_cpu(cwsid->sub_auth[i]))
113 return 0; /* sids compare/match */
116 static void smb_copy_sid(struct smb_sid *dst, const struct smb_sid *src)
120 dst->revision = src->revision;
121 dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES);
122 for (i = 0; i < NUM_AUTHS; ++i)
123 dst->authority[i] = src->authority[i];
124 for (i = 0; i < dst->num_subauth; ++i)
125 dst->sub_auth[i] = src->sub_auth[i];
129 * change posix mode to reflect permissions
130 * pmode is the existing mode (we only want to overwrite part of this
131 * bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007
133 static umode_t access_flags_to_mode(struct smb_fattr *fattr, __le32 ace_flags,
136 __u32 flags = le32_to_cpu(ace_flags);
139 if (flags & GENERIC_ALL) {
141 ksmbd_debug(SMB, "all perms\n");
145 if ((flags & GENERIC_READ) || (flags & FILE_READ_RIGHTS))
147 if ((flags & GENERIC_WRITE) || (flags & FILE_WRITE_RIGHTS)) {
149 if (S_ISDIR(fattr->cf_mode))
152 if ((flags & GENERIC_EXECUTE) || (flags & FILE_EXEC_RIGHTS))
155 if (type == ACCESS_DENIED_ACE_TYPE || type == ACCESS_DENIED_OBJECT_ACE_TYPE)
158 ksmbd_debug(SMB, "access flags 0x%x mode now %04o\n", flags, mode);
164 * Generate access flags to reflect permissions mode is the existing mode.
165 * This function is called for every ACE in the DACL whose SID matches
166 * with either owner or group or everyone.
168 static void mode_to_access_flags(umode_t mode, umode_t bits_to_use,
171 /* reset access mask */
174 /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */
178 * check for R/W/X UGO since we do not know whose flags
179 * is this but we have cleared all the bits sans RWX for
180 * either user or group or other as per bits_to_use
183 *pace_flags |= SET_FILE_READ_RIGHTS;
185 *pace_flags |= FILE_WRITE_RIGHTS;
187 *pace_flags |= SET_FILE_EXEC_RIGHTS;
189 ksmbd_debug(SMB, "mode: %o, access flags now 0x%x\n",
193 static __u16 fill_ace_for_sid(struct smb_ace *pntace,
194 const struct smb_sid *psid, int type, int flags,
195 umode_t mode, umode_t bits)
199 __u32 access_req = 0;
202 pntace->flags = flags;
203 mode_to_access_flags(mode, bits, &access_req);
205 access_req = SET_MINIMUM_RIGHTS;
206 pntace->access_req = cpu_to_le32(access_req);
208 pntace->sid.revision = psid->revision;
209 pntace->sid.num_subauth = psid->num_subauth;
210 for (i = 0; i < NUM_AUTHS; i++)
211 pntace->sid.authority[i] = psid->authority[i];
212 for (i = 0; i < psid->num_subauth; i++)
213 pntace->sid.sub_auth[i] = psid->sub_auth[i];
215 size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4);
216 pntace->size = cpu_to_le16(size);
221 void id_to_sid(unsigned int cid, uint sidtype, struct smb_sid *ssid)
225 smb_copy_sid(ssid, &server_conf.domain_sid);
228 smb_copy_sid(ssid, &sid_unix_users);
231 smb_copy_sid(ssid, &sid_unix_groups);
233 case SIDCREATOR_OWNER:
234 smb_copy_sid(ssid, &creator_owner);
236 case SIDCREATOR_GROUP:
237 smb_copy_sid(ssid, &creator_group);
240 smb_copy_sid(ssid, &sid_unix_NFS_users);
243 smb_copy_sid(ssid, &sid_unix_NFS_groups);
246 smb_copy_sid(ssid, &sid_unix_NFS_mode);
253 ssid->sub_auth[ssid->num_subauth] = cpu_to_le32(cid);
257 static int sid_to_id(struct mnt_idmap *idmap,
258 struct smb_sid *psid, uint sidtype,
259 struct smb_fattr *fattr)
264 * If we have too many subauthorities, then something is really wrong.
265 * Just return an error.
267 if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) {
268 pr_err("%s: %u subauthorities is too many!\n",
269 __func__, psid->num_subauth);
273 if (sidtype == SIDOWNER) {
277 id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]);
278 uid = KUIDT_INIT(id);
279 uid = from_vfsuid(idmap, &init_user_ns, VFSUIDT_INIT(uid));
280 if (uid_valid(uid)) {
288 id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]);
289 gid = KGIDT_INIT(id);
290 gid = from_vfsgid(idmap, &init_user_ns, VFSGIDT_INIT(gid));
291 if (gid_valid(gid)) {
300 void posix_state_to_acl(struct posix_acl_state *state,
301 struct posix_acl_entry *pace)
305 pace->e_tag = ACL_USER_OBJ;
306 pace->e_perm = state->owner.allow;
307 for (i = 0; i < state->users->n; i++) {
309 pace->e_tag = ACL_USER;
310 pace->e_uid = state->users->aces[i].uid;
311 pace->e_perm = state->users->aces[i].perms.allow;
315 pace->e_tag = ACL_GROUP_OBJ;
316 pace->e_perm = state->group.allow;
318 for (i = 0; i < state->groups->n; i++) {
320 pace->e_tag = ACL_GROUP;
321 pace->e_gid = state->groups->aces[i].gid;
322 pace->e_perm = state->groups->aces[i].perms.allow;
325 if (state->users->n || state->groups->n) {
327 pace->e_tag = ACL_MASK;
328 pace->e_perm = state->mask.allow;
332 pace->e_tag = ACL_OTHER;
333 pace->e_perm = state->other.allow;
336 int init_acl_state(struct posix_acl_state *state, int cnt)
340 memset(state, 0, sizeof(struct posix_acl_state));
342 * In the worst case, each individual acl could be for a distinct
343 * named user or group, but we don't know which, so we allocate
344 * enough space for either:
346 alloc = sizeof(struct posix_ace_state_array)
347 + cnt * sizeof(struct posix_user_ace_state);
348 state->users = kzalloc(alloc, GFP_KERNEL);
351 state->groups = kzalloc(alloc, GFP_KERNEL);
352 if (!state->groups) {
359 void free_acl_state(struct posix_acl_state *state)
362 kfree(state->groups);
365 static void parse_dacl(struct mnt_idmap *idmap,
366 struct smb_acl *pdacl, char *end_of_acl,
367 struct smb_sid *pownersid, struct smb_sid *pgrpsid,
368 struct smb_fattr *fattr)
372 unsigned int acl_size;
374 struct smb_ace **ppace;
375 struct posix_acl_entry *cf_pace, *cf_pdace;
376 struct posix_acl_state acl_state, default_acl_state;
377 umode_t mode = 0, acl_mode;
378 bool owner_found = false, group_found = false, others_found = false;
383 /* validate that we do not go past end of acl */
384 if (end_of_acl < (char *)pdacl + sizeof(struct smb_acl) ||
385 end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
386 pr_err("ACL too small to parse DACL\n");
390 ksmbd_debug(SMB, "DACL revision %d size %d num aces %d\n",
391 le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
392 le32_to_cpu(pdacl->num_aces));
394 acl_base = (char *)pdacl;
395 acl_size = sizeof(struct smb_acl);
397 num_aces = le32_to_cpu(pdacl->num_aces);
401 if (num_aces > ULONG_MAX / sizeof(struct smb_ace *))
404 ppace = kmalloc_array(num_aces, sizeof(struct smb_ace *), GFP_KERNEL);
408 ret = init_acl_state(&acl_state, num_aces);
411 ret = init_acl_state(&default_acl_state, num_aces);
413 free_acl_state(&acl_state);
418 * reset rwx permissions for user/group/other.
419 * Also, if num_aces is 0 i.e. DACL has no ACEs,
420 * user/group/other have no permissions
422 for (i = 0; i < num_aces; ++i) {
423 if (end_of_acl - acl_base < acl_size)
426 ppace[i] = (struct smb_ace *)(acl_base + acl_size);
427 acl_base = (char *)ppace[i];
428 acl_size = offsetof(struct smb_ace, sid) +
429 offsetof(struct smb_sid, sub_auth);
431 if (end_of_acl - acl_base < acl_size ||
432 ppace[i]->sid.num_subauth > SID_MAX_SUB_AUTHORITIES ||
433 (end_of_acl - acl_base <
434 acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth) ||
435 (le16_to_cpu(ppace[i]->size) <
436 acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth))
439 acl_size = le16_to_cpu(ppace[i]->size);
440 ppace[i]->access_req =
441 smb_map_generic_desired_access(ppace[i]->access_req);
443 if (!(compare_sids(&ppace[i]->sid, &sid_unix_NFS_mode))) {
445 le32_to_cpu(ppace[i]->sid.sub_auth[2]);
447 } else if (!compare_sids(&ppace[i]->sid, pownersid)) {
448 acl_mode = access_flags_to_mode(fattr,
449 ppace[i]->access_req,
458 } else if (!compare_sids(&ppace[i]->sid, pgrpsid) ||
459 ppace[i]->sid.sub_auth[ppace[i]->sid.num_subauth - 1] ==
460 DOMAIN_USER_RID_LE) {
461 acl_mode = access_flags_to_mode(fattr,
462 ppace[i]->access_req,
470 } else if (!compare_sids(&ppace[i]->sid, &sid_everyone)) {
471 acl_mode = access_flags_to_mode(fattr,
472 ppace[i]->access_req,
480 } else if (!compare_sids(&ppace[i]->sid, &creator_owner)) {
482 } else if (!compare_sids(&ppace[i]->sid, &creator_group)) {
484 } else if (!compare_sids(&ppace[i]->sid, &sid_authusers)) {
487 struct smb_fattr temp_fattr;
489 acl_mode = access_flags_to_mode(fattr, ppace[i]->access_req,
491 temp_fattr.cf_uid = INVALID_UID;
492 ret = sid_to_id(idmap, &ppace[i]->sid, SIDOWNER, &temp_fattr);
493 if (ret || uid_eq(temp_fattr.cf_uid, INVALID_UID)) {
494 pr_err("%s: Error %d mapping Owner SID to uid\n",
499 acl_state.owner.allow = ((acl_mode & 0700) >> 6) | 0004;
500 acl_state.users->aces[acl_state.users->n].uid =
502 acl_state.users->aces[acl_state.users->n++].perms.allow =
503 ((acl_mode & 0700) >> 6) | 0004;
504 default_acl_state.owner.allow = ((acl_mode & 0700) >> 6) | 0004;
505 default_acl_state.users->aces[default_acl_state.users->n].uid =
507 default_acl_state.users->aces[default_acl_state.users->n++].perms.allow =
508 ((acl_mode & 0700) >> 6) | 0004;
514 /* The owner must be set to at least read-only. */
515 acl_state.owner.allow = ((mode & 0700) >> 6) | 0004;
516 acl_state.users->aces[acl_state.users->n].uid = fattr->cf_uid;
517 acl_state.users->aces[acl_state.users->n++].perms.allow =
518 ((mode & 0700) >> 6) | 0004;
519 default_acl_state.owner.allow = ((mode & 0700) >> 6) | 0004;
520 default_acl_state.users->aces[default_acl_state.users->n].uid =
522 default_acl_state.users->aces[default_acl_state.users->n++].perms.allow =
523 ((mode & 0700) >> 6) | 0004;
527 acl_state.group.allow = (mode & 0070) >> 3;
528 acl_state.groups->aces[acl_state.groups->n].gid =
530 acl_state.groups->aces[acl_state.groups->n++].perms.allow =
532 default_acl_state.group.allow = (mode & 0070) >> 3;
533 default_acl_state.groups->aces[default_acl_state.groups->n].gid =
535 default_acl_state.groups->aces[default_acl_state.groups->n++].perms.allow =
540 fattr->cf_mode &= ~(0007);
541 fattr->cf_mode |= mode & 0007;
543 acl_state.other.allow = mode & 0007;
544 default_acl_state.other.allow = mode & 0007;
547 if (acl_state.users->n || acl_state.groups->n) {
548 acl_state.mask.allow = 0x07;
550 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
552 posix_acl_alloc(acl_state.users->n +
553 acl_state.groups->n + 4, GFP_KERNEL);
554 if (fattr->cf_acls) {
555 cf_pace = fattr->cf_acls->a_entries;
556 posix_state_to_acl(&acl_state, cf_pace);
561 if (default_acl_state.users->n || default_acl_state.groups->n) {
562 default_acl_state.mask.allow = 0x07;
564 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
566 posix_acl_alloc(default_acl_state.users->n +
567 default_acl_state.groups->n + 4, GFP_KERNEL);
568 if (fattr->cf_dacls) {
569 cf_pdace = fattr->cf_dacls->a_entries;
570 posix_state_to_acl(&default_acl_state, cf_pdace);
574 free_acl_state(&acl_state);
575 free_acl_state(&default_acl_state);
578 static void set_posix_acl_entries_dacl(struct mnt_idmap *idmap,
579 struct smb_ace *pndace,
580 struct smb_fattr *fattr, u32 *num_aces,
581 u16 *size, u32 nt_aces_num)
583 struct posix_acl_entry *pace;
585 struct smb_ace *ntace;
589 goto posix_default_acl;
591 pace = fattr->cf_acls->a_entries;
592 for (i = 0; i < fattr->cf_acls->a_count; i++, pace++) {
595 sid = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
599 if (pace->e_tag == ACL_USER) {
601 unsigned int sid_type = SIDOWNER;
603 uid = posix_acl_uid_translate(idmap, pace);
605 sid_type = SIDUNIX_USER;
606 id_to_sid(uid, sid_type, sid);
607 } else if (pace->e_tag == ACL_GROUP) {
610 gid = posix_acl_gid_translate(idmap, pace);
611 id_to_sid(gid, SIDUNIX_GROUP, sid);
612 } else if (pace->e_tag == ACL_OTHER && !nt_aces_num) {
613 smb_copy_sid(sid, &sid_everyone);
619 for (j = 0; j < nt_aces_num; j++) {
620 if (ntace->sid.sub_auth[ntace->sid.num_subauth - 1] ==
621 sid->sub_auth[sid->num_subauth - 1])
623 ntace = (struct smb_ace *)((char *)ntace +
624 le16_to_cpu(ntace->size));
627 if (S_ISDIR(fattr->cf_mode) && pace->e_tag == ACL_OTHER)
630 ntace = (struct smb_ace *)((char *)pndace + *size);
631 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, flags,
634 if (pace->e_tag == ACL_USER)
636 FILE_DELETE_LE | FILE_DELETE_CHILD_LE;
638 if (S_ISDIR(fattr->cf_mode) &&
639 (pace->e_tag == ACL_USER || pace->e_tag == ACL_GROUP)) {
640 ntace = (struct smb_ace *)((char *)pndace + *size);
641 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED,
642 0x03, pace->e_perm, 0777);
644 if (pace->e_tag == ACL_USER)
646 FILE_DELETE_LE | FILE_DELETE_CHILD_LE;
657 if (!fattr->cf_dacls)
660 pace = fattr->cf_dacls->a_entries;
661 for (i = 0; i < fattr->cf_dacls->a_count; i++, pace++) {
662 sid = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
666 if (pace->e_tag == ACL_USER) {
669 uid = posix_acl_uid_translate(idmap, pace);
670 id_to_sid(uid, SIDCREATOR_OWNER, sid);
671 } else if (pace->e_tag == ACL_GROUP) {
674 gid = posix_acl_gid_translate(idmap, pace);
675 id_to_sid(gid, SIDCREATOR_GROUP, sid);
681 ntace = (struct smb_ace *)((char *)pndace + *size);
682 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, 0x0b,
685 if (pace->e_tag == ACL_USER)
687 FILE_DELETE_LE | FILE_DELETE_CHILD_LE;
692 static void set_ntacl_dacl(struct mnt_idmap *idmap,
693 struct smb_acl *pndacl,
694 struct smb_acl *nt_dacl,
695 unsigned int aces_size,
696 const struct smb_sid *pownersid,
697 const struct smb_sid *pgrpsid,
698 struct smb_fattr *fattr)
700 struct smb_ace *ntace, *pndace;
701 int nt_num_aces = le32_to_cpu(nt_dacl->num_aces), num_aces = 0;
702 unsigned short size = 0;
705 pndace = (struct smb_ace *)((char *)pndacl + sizeof(struct smb_acl));
707 ntace = (struct smb_ace *)((char *)nt_dacl + sizeof(struct smb_acl));
708 for (i = 0; i < nt_num_aces; i++) {
709 unsigned short nt_ace_size;
711 if (offsetof(struct smb_ace, access_req) > aces_size)
714 nt_ace_size = le16_to_cpu(ntace->size);
715 if (nt_ace_size > aces_size)
718 memcpy((char *)pndace + size, ntace, nt_ace_size);
720 aces_size -= nt_ace_size;
721 ntace = (struct smb_ace *)((char *)ntace + nt_ace_size);
726 set_posix_acl_entries_dacl(idmap, pndace, fattr,
727 &num_aces, &size, nt_num_aces);
728 pndacl->num_aces = cpu_to_le32(num_aces);
729 pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size);
732 static void set_mode_dacl(struct mnt_idmap *idmap,
733 struct smb_acl *pndacl, struct smb_fattr *fattr)
735 struct smb_ace *pace, *pndace;
737 u16 size = 0, ace_size = 0;
739 const struct smb_sid *sid;
741 pace = pndace = (struct smb_ace *)((char *)pndacl + sizeof(struct smb_acl));
743 if (fattr->cf_acls) {
744 set_posix_acl_entries_dacl(idmap, pndace, fattr,
745 &num_aces, &size, num_aces);
750 uid = from_kuid(&init_user_ns, fattr->cf_uid);
752 sid = &server_conf.domain_sid;
754 sid = &sid_unix_users;
755 ace_size = fill_ace_for_sid(pace, sid, ACCESS_ALLOWED, 0,
756 fattr->cf_mode, 0700);
757 pace->sid.sub_auth[pace->sid.num_subauth++] = cpu_to_le32(uid);
758 pace->size = cpu_to_le16(ace_size + 4);
759 size += le16_to_cpu(pace->size);
760 pace = (struct smb_ace *)((char *)pndace + size);
763 ace_size = fill_ace_for_sid(pace, &sid_unix_groups,
764 ACCESS_ALLOWED, 0, fattr->cf_mode, 0070);
765 pace->sid.sub_auth[pace->sid.num_subauth++] =
766 cpu_to_le32(from_kgid(&init_user_ns, fattr->cf_gid));
767 pace->size = cpu_to_le16(ace_size + 4);
768 size += le16_to_cpu(pace->size);
769 pace = (struct smb_ace *)((char *)pndace + size);
772 if (S_ISDIR(fattr->cf_mode)) {
773 pace = (struct smb_ace *)((char *)pndace + size);
776 size += fill_ace_for_sid(pace, &creator_owner, ACCESS_ALLOWED,
777 0x0b, fattr->cf_mode, 0700);
778 pace = (struct smb_ace *)((char *)pndace + size);
781 size += fill_ace_for_sid(pace, &creator_group, ACCESS_ALLOWED,
782 0x0b, fattr->cf_mode, 0070);
783 pace = (struct smb_ace *)((char *)pndace + size);
788 size += fill_ace_for_sid(pace, &sid_everyone, ACCESS_ALLOWED, 0,
789 fattr->cf_mode, 0007);
792 pndacl->num_aces = cpu_to_le32(num_aces);
793 pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size);
796 static int parse_sid(struct smb_sid *psid, char *end_of_acl)
799 * validate that we do not go past end of ACL - sid must be at least 8
800 * bytes long (assuming no sub-auths - e.g. the null SID
802 if (end_of_acl < (char *)psid + 8) {
803 pr_err("ACL too small to parse SID %p\n", psid);
810 /* Convert CIFS ACL to POSIX form */
811 int parse_sec_desc(struct mnt_idmap *idmap, struct smb_ntsd *pntsd,
812 int acl_len, struct smb_fattr *fattr)
815 struct smb_sid *owner_sid_ptr, *group_sid_ptr;
816 struct smb_acl *dacl_ptr; /* no need for SACL ptr */
817 char *end_of_acl = ((char *)pntsd) + acl_len;
824 if (acl_len < sizeof(struct smb_ntsd))
827 owner_sid_ptr = (struct smb_sid *)((char *)pntsd +
828 le32_to_cpu(pntsd->osidoffset));
829 group_sid_ptr = (struct smb_sid *)((char *)pntsd +
830 le32_to_cpu(pntsd->gsidoffset));
831 dacloffset = le32_to_cpu(pntsd->dacloffset);
832 dacl_ptr = (struct smb_acl *)((char *)pntsd + dacloffset);
834 "revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n",
835 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),
836 le32_to_cpu(pntsd->gsidoffset),
837 le32_to_cpu(pntsd->sacloffset), dacloffset);
839 pntsd_type = le16_to_cpu(pntsd->type);
840 if (!(pntsd_type & DACL_PRESENT)) {
841 ksmbd_debug(SMB, "DACL_PRESENT in DACL type is not set\n");
845 pntsd->type = cpu_to_le16(DACL_PRESENT);
847 if (pntsd->osidoffset) {
848 rc = parse_sid(owner_sid_ptr, end_of_acl);
850 pr_err("%s: Error %d parsing Owner SID\n", __func__, rc);
854 rc = sid_to_id(idmap, owner_sid_ptr, SIDOWNER, fattr);
856 pr_err("%s: Error %d mapping Owner SID to uid\n",
858 owner_sid_ptr = NULL;
862 if (pntsd->gsidoffset) {
863 rc = parse_sid(group_sid_ptr, end_of_acl);
865 pr_err("%s: Error %d mapping Owner SID to gid\n",
869 rc = sid_to_id(idmap, group_sid_ptr, SIDUNIX_GROUP, fattr);
871 pr_err("%s: Error %d mapping Group SID to gid\n",
873 group_sid_ptr = NULL;
877 if ((pntsd_type & (DACL_AUTO_INHERITED | DACL_AUTO_INHERIT_REQ)) ==
878 (DACL_AUTO_INHERITED | DACL_AUTO_INHERIT_REQ))
879 pntsd->type |= cpu_to_le16(DACL_AUTO_INHERITED);
880 if (pntsd_type & DACL_PROTECTED)
881 pntsd->type |= cpu_to_le16(DACL_PROTECTED);
884 parse_dacl(idmap, dacl_ptr, end_of_acl,
885 owner_sid_ptr, group_sid_ptr, fattr);
891 /* Convert permission bits from mode to equivalent CIFS ACL */
892 int build_sec_desc(struct mnt_idmap *idmap,
893 struct smb_ntsd *pntsd, struct smb_ntsd *ppntsd,
894 int ppntsd_size, int addition_info, __u32 *secdesclen,
895 struct smb_fattr *fattr)
899 struct smb_sid *owner_sid_ptr, *group_sid_ptr;
900 struct smb_sid *nowner_sid_ptr, *ngroup_sid_ptr;
901 struct smb_acl *dacl_ptr = NULL; /* no need for SACL ptr */
904 unsigned int sid_type = SIDOWNER;
906 nowner_sid_ptr = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
910 uid = from_kuid(&init_user_ns, fattr->cf_uid);
912 sid_type = SIDUNIX_USER;
913 id_to_sid(uid, sid_type, nowner_sid_ptr);
915 ngroup_sid_ptr = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
916 if (!ngroup_sid_ptr) {
917 kfree(nowner_sid_ptr);
921 gid = from_kgid(&init_user_ns, fattr->cf_gid);
922 id_to_sid(gid, SIDUNIX_GROUP, ngroup_sid_ptr);
924 offset = sizeof(struct smb_ntsd);
925 pntsd->sacloffset = 0;
926 pntsd->revision = cpu_to_le16(1);
927 pntsd->type = cpu_to_le16(SELF_RELATIVE);
929 pntsd->type |= ppntsd->type;
931 if (addition_info & OWNER_SECINFO) {
932 pntsd->osidoffset = cpu_to_le32(offset);
933 owner_sid_ptr = (struct smb_sid *)((char *)pntsd + offset);
934 smb_copy_sid(owner_sid_ptr, nowner_sid_ptr);
935 offset += 1 + 1 + 6 + (nowner_sid_ptr->num_subauth * 4);
938 if (addition_info & GROUP_SECINFO) {
939 pntsd->gsidoffset = cpu_to_le32(offset);
940 group_sid_ptr = (struct smb_sid *)((char *)pntsd + offset);
941 smb_copy_sid(group_sid_ptr, ngroup_sid_ptr);
942 offset += 1 + 1 + 6 + (ngroup_sid_ptr->num_subauth * 4);
945 if (addition_info & DACL_SECINFO) {
946 pntsd->type |= cpu_to_le16(DACL_PRESENT);
947 dacl_ptr = (struct smb_acl *)((char *)pntsd + offset);
948 dacl_ptr->revision = cpu_to_le16(2);
949 dacl_ptr->size = cpu_to_le16(sizeof(struct smb_acl));
950 dacl_ptr->num_aces = 0;
953 set_mode_dacl(idmap, dacl_ptr, fattr);
955 struct smb_acl *ppdacl_ptr;
956 unsigned int dacl_offset = le32_to_cpu(ppntsd->dacloffset);
957 int ppdacl_size, ntacl_size = ppntsd_size - dacl_offset;
960 (dacl_offset + sizeof(struct smb_acl) > ppntsd_size))
963 ppdacl_ptr = (struct smb_acl *)((char *)ppntsd + dacl_offset);
964 ppdacl_size = le16_to_cpu(ppdacl_ptr->size);
965 if (ppdacl_size > ntacl_size ||
966 ppdacl_size < sizeof(struct smb_acl))
969 set_ntacl_dacl(idmap, dacl_ptr, ppdacl_ptr,
970 ntacl_size - sizeof(struct smb_acl),
971 nowner_sid_ptr, ngroup_sid_ptr,
974 pntsd->dacloffset = cpu_to_le32(offset);
975 offset += le16_to_cpu(dacl_ptr->size);
979 kfree(nowner_sid_ptr);
980 kfree(ngroup_sid_ptr);
981 *secdesclen = offset;
985 static void smb_set_ace(struct smb_ace *ace, const struct smb_sid *sid, u8 type,
986 u8 flags, __le32 access_req)
990 ace->access_req = access_req;
991 smb_copy_sid(&ace->sid, sid);
992 ace->size = cpu_to_le16(1 + 1 + 2 + 4 + 1 + 1 + 6 + (sid->num_subauth * 4));
995 int smb_inherit_dacl(struct ksmbd_conn *conn,
996 const struct path *path,
997 unsigned int uid, unsigned int gid)
999 const struct smb_sid *psid, *creator = NULL;
1000 struct smb_ace *parent_aces, *aces;
1001 struct smb_acl *parent_pdacl;
1002 struct smb_ntsd *parent_pntsd = NULL;
1003 struct smb_sid owner_sid, group_sid;
1004 struct dentry *parent = path->dentry->d_parent;
1005 struct mnt_idmap *idmap = mnt_idmap(path->mnt);
1006 int inherited_flags = 0, flags = 0, i, ace_cnt = 0, nt_size = 0, pdacl_size;
1007 int rc = 0, num_aces, dacloffset, pntsd_type, pntsd_size, acl_len, aces_size;
1009 bool is_dir = S_ISDIR(d_inode(path->dentry)->i_mode);
1011 pntsd_size = ksmbd_vfs_get_sd_xattr(conn, idmap,
1012 parent, &parent_pntsd);
1013 if (pntsd_size <= 0)
1015 dacloffset = le32_to_cpu(parent_pntsd->dacloffset);
1016 if (!dacloffset || (dacloffset + sizeof(struct smb_acl) > pntsd_size)) {
1018 goto free_parent_pntsd;
1021 parent_pdacl = (struct smb_acl *)((char *)parent_pntsd + dacloffset);
1022 acl_len = pntsd_size - dacloffset;
1023 num_aces = le32_to_cpu(parent_pdacl->num_aces);
1024 pntsd_type = le16_to_cpu(parent_pntsd->type);
1025 pdacl_size = le16_to_cpu(parent_pdacl->size);
1027 if (pdacl_size > acl_len || pdacl_size < sizeof(struct smb_acl)) {
1029 goto free_parent_pntsd;
1032 aces_base = kmalloc(sizeof(struct smb_ace) * num_aces * 2, GFP_KERNEL);
1035 goto free_parent_pntsd;
1038 aces = (struct smb_ace *)aces_base;
1039 parent_aces = (struct smb_ace *)((char *)parent_pdacl +
1040 sizeof(struct smb_acl));
1041 aces_size = acl_len - sizeof(struct smb_acl);
1043 if (pntsd_type & DACL_AUTO_INHERITED)
1044 inherited_flags = INHERITED_ACE;
1046 for (i = 0; i < num_aces; i++) {
1049 if (offsetof(struct smb_ace, access_req) > aces_size)
1052 pace_size = le16_to_cpu(parent_aces->size);
1053 if (pace_size > aces_size)
1056 aces_size -= pace_size;
1058 flags = parent_aces->flags;
1059 if (!smb_inherit_flags(flags, is_dir))
1062 flags &= ~(INHERIT_ONLY_ACE | INHERITED_ACE);
1063 if (!(flags & CONTAINER_INHERIT_ACE))
1064 flags |= INHERIT_ONLY_ACE;
1065 if (flags & NO_PROPAGATE_INHERIT_ACE)
1071 if (!compare_sids(&creator_owner, &parent_aces->sid)) {
1072 creator = &creator_owner;
1073 id_to_sid(uid, SIDOWNER, &owner_sid);
1075 } else if (!compare_sids(&creator_group, &parent_aces->sid)) {
1076 creator = &creator_group;
1077 id_to_sid(gid, SIDUNIX_GROUP, &group_sid);
1081 psid = &parent_aces->sid;
1084 if (is_dir && creator && flags & CONTAINER_INHERIT_ACE) {
1085 smb_set_ace(aces, psid, parent_aces->type, inherited_flags,
1086 parent_aces->access_req);
1087 nt_size += le16_to_cpu(aces->size);
1089 aces = (struct smb_ace *)((char *)aces + le16_to_cpu(aces->size));
1090 flags |= INHERIT_ONLY_ACE;
1092 } else if (is_dir && !(parent_aces->flags & NO_PROPAGATE_INHERIT_ACE)) {
1093 psid = &parent_aces->sid;
1096 smb_set_ace(aces, psid, parent_aces->type, flags | inherited_flags,
1097 parent_aces->access_req);
1098 nt_size += le16_to_cpu(aces->size);
1099 aces = (struct smb_ace *)((char *)aces + le16_to_cpu(aces->size));
1102 parent_aces = (struct smb_ace *)((char *)parent_aces + pace_size);
1106 struct smb_ntsd *pntsd;
1107 struct smb_acl *pdacl;
1108 struct smb_sid *powner_sid = NULL, *pgroup_sid = NULL;
1109 int powner_sid_size = 0, pgroup_sid_size = 0, pntsd_size;
1110 int pntsd_alloc_size;
1112 if (parent_pntsd->osidoffset) {
1113 powner_sid = (struct smb_sid *)((char *)parent_pntsd +
1114 le32_to_cpu(parent_pntsd->osidoffset));
1115 powner_sid_size = 1 + 1 + 6 + (powner_sid->num_subauth * 4);
1117 if (parent_pntsd->gsidoffset) {
1118 pgroup_sid = (struct smb_sid *)((char *)parent_pntsd +
1119 le32_to_cpu(parent_pntsd->gsidoffset));
1120 pgroup_sid_size = 1 + 1 + 6 + (pgroup_sid->num_subauth * 4);
1123 pntsd_alloc_size = sizeof(struct smb_ntsd) + powner_sid_size +
1124 pgroup_sid_size + sizeof(struct smb_acl) + nt_size;
1126 pntsd = kzalloc(pntsd_alloc_size, GFP_KERNEL);
1129 goto free_aces_base;
1132 pntsd->revision = cpu_to_le16(1);
1133 pntsd->type = cpu_to_le16(SELF_RELATIVE | DACL_PRESENT);
1134 if (le16_to_cpu(parent_pntsd->type) & DACL_AUTO_INHERITED)
1135 pntsd->type |= cpu_to_le16(DACL_AUTO_INHERITED);
1136 pntsd_size = sizeof(struct smb_ntsd);
1137 pntsd->osidoffset = parent_pntsd->osidoffset;
1138 pntsd->gsidoffset = parent_pntsd->gsidoffset;
1139 pntsd->dacloffset = parent_pntsd->dacloffset;
1141 if ((u64)le32_to_cpu(pntsd->osidoffset) + powner_sid_size >
1145 goto free_aces_base;
1148 if ((u64)le32_to_cpu(pntsd->gsidoffset) + pgroup_sid_size >
1152 goto free_aces_base;
1155 if ((u64)le32_to_cpu(pntsd->dacloffset) + sizeof(struct smb_acl) + nt_size >
1159 goto free_aces_base;
1162 if (pntsd->osidoffset) {
1163 struct smb_sid *owner_sid = (struct smb_sid *)((char *)pntsd +
1164 le32_to_cpu(pntsd->osidoffset));
1165 memcpy(owner_sid, powner_sid, powner_sid_size);
1166 pntsd_size += powner_sid_size;
1169 if (pntsd->gsidoffset) {
1170 struct smb_sid *group_sid = (struct smb_sid *)((char *)pntsd +
1171 le32_to_cpu(pntsd->gsidoffset));
1172 memcpy(group_sid, pgroup_sid, pgroup_sid_size);
1173 pntsd_size += pgroup_sid_size;
1176 if (pntsd->dacloffset) {
1177 struct smb_ace *pace;
1179 pdacl = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset));
1180 pdacl->revision = cpu_to_le16(2);
1181 pdacl->size = cpu_to_le16(sizeof(struct smb_acl) + nt_size);
1182 pdacl->num_aces = cpu_to_le32(ace_cnt);
1183 pace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl));
1184 memcpy(pace, aces_base, nt_size);
1185 pntsd_size += sizeof(struct smb_acl) + nt_size;
1188 ksmbd_vfs_set_sd_xattr(conn, idmap, path, pntsd, pntsd_size, false);
1195 kfree(parent_pntsd);
1199 bool smb_inherit_flags(int flags, bool is_dir)
1202 return (flags & OBJECT_INHERIT_ACE) != 0;
1204 if (flags & OBJECT_INHERIT_ACE && !(flags & NO_PROPAGATE_INHERIT_ACE))
1207 if (flags & CONTAINER_INHERIT_ACE)
1212 int smb_check_perm_dacl(struct ksmbd_conn *conn, const struct path *path,
1213 __le32 *pdaccess, int uid)
1215 struct mnt_idmap *idmap = mnt_idmap(path->mnt);
1216 struct smb_ntsd *pntsd = NULL;
1217 struct smb_acl *pdacl;
1218 struct posix_acl *posix_acls;
1219 int rc = 0, pntsd_size, acl_size, aces_size, pdacl_size, dacl_offset;
1221 int granted = le32_to_cpu(*pdaccess & ~FILE_MAXIMAL_ACCESS_LE);
1222 struct smb_ace *ace;
1224 unsigned int access_bits = 0;
1225 struct smb_ace *others_ace = NULL;
1226 struct posix_acl_entry *pa_entry;
1227 unsigned int sid_type = SIDOWNER;
1228 unsigned short ace_size;
1230 ksmbd_debug(SMB, "check permission using windows acl\n");
1231 pntsd_size = ksmbd_vfs_get_sd_xattr(conn, idmap,
1232 path->dentry, &pntsd);
1233 if (pntsd_size <= 0 || !pntsd)
1236 dacl_offset = le32_to_cpu(pntsd->dacloffset);
1238 (dacl_offset + sizeof(struct smb_acl) > pntsd_size))
1241 pdacl = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset));
1242 acl_size = pntsd_size - dacl_offset;
1243 pdacl_size = le16_to_cpu(pdacl->size);
1245 if (pdacl_size > acl_size || pdacl_size < sizeof(struct smb_acl))
1248 if (!pdacl->num_aces) {
1249 if (!(pdacl_size - sizeof(struct smb_acl)) &&
1250 *pdaccess & ~(FILE_READ_CONTROL_LE | FILE_WRITE_DAC_LE)) {
1257 if (*pdaccess & FILE_MAXIMAL_ACCESS_LE) {
1258 granted = READ_CONTROL | WRITE_DAC | FILE_READ_ATTRIBUTES |
1261 ace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl));
1262 aces_size = acl_size - sizeof(struct smb_acl);
1263 for (i = 0; i < le32_to_cpu(pdacl->num_aces); i++) {
1264 if (offsetof(struct smb_ace, access_req) > aces_size)
1266 ace_size = le16_to_cpu(ace->size);
1267 if (ace_size > aces_size)
1269 aces_size -= ace_size;
1270 granted |= le32_to_cpu(ace->access_req);
1271 ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size));
1274 if (!pdacl->num_aces)
1275 granted = GENERIC_ALL_FLAGS;
1279 sid_type = SIDUNIX_USER;
1280 id_to_sid(uid, sid_type, &sid);
1282 ace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl));
1283 aces_size = acl_size - sizeof(struct smb_acl);
1284 for (i = 0; i < le32_to_cpu(pdacl->num_aces); i++) {
1285 if (offsetof(struct smb_ace, access_req) > aces_size)
1287 ace_size = le16_to_cpu(ace->size);
1288 if (ace_size > aces_size)
1290 aces_size -= ace_size;
1292 if (!compare_sids(&sid, &ace->sid) ||
1293 !compare_sids(&sid_unix_NFS_mode, &ace->sid)) {
1297 if (!compare_sids(&sid_everyone, &ace->sid))
1300 ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size));
1303 if (*pdaccess & FILE_MAXIMAL_ACCESS_LE && found) {
1304 granted = READ_CONTROL | WRITE_DAC | FILE_READ_ATTRIBUTES |
1307 granted |= le32_to_cpu(ace->access_req);
1309 if (!pdacl->num_aces)
1310 granted = GENERIC_ALL_FLAGS;
1313 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
1314 posix_acls = get_inode_acl(d_inode(path->dentry), ACL_TYPE_ACCESS);
1315 if (!IS_ERR_OR_NULL(posix_acls) && !found) {
1316 unsigned int id = -1;
1318 pa_entry = posix_acls->a_entries;
1319 for (i = 0; i < posix_acls->a_count; i++, pa_entry++) {
1320 if (pa_entry->e_tag == ACL_USER)
1321 id = posix_acl_uid_translate(idmap, pa_entry);
1322 else if (pa_entry->e_tag == ACL_GROUP)
1323 id = posix_acl_gid_translate(idmap, pa_entry);
1328 mode_to_access_flags(pa_entry->e_perm,
1334 posix_acl_release(posix_acls);
1335 goto check_access_bits;
1339 if (!IS_ERR_OR_NULL(posix_acls))
1340 posix_acl_release(posix_acls);
1347 ksmbd_debug(SMB, "Can't find corresponding sid\n");
1353 switch (ace->type) {
1354 case ACCESS_ALLOWED_ACE_TYPE:
1355 access_bits = le32_to_cpu(ace->access_req);
1357 case ACCESS_DENIED_ACE_TYPE:
1358 case ACCESS_DENIED_CALLBACK_ACE_TYPE:
1359 access_bits = le32_to_cpu(~ace->access_req);
1365 ~(access_bits | FILE_READ_ATTRIBUTES | READ_CONTROL | WRITE_DAC | DELETE)) {
1366 ksmbd_debug(SMB, "Access denied with winACL, granted : %x, access_req : %x\n",
1367 granted, le32_to_cpu(ace->access_req));
1372 *pdaccess = cpu_to_le32(granted);
1378 int set_info_sec(struct ksmbd_conn *conn, struct ksmbd_tree_connect *tcon,
1379 const struct path *path, struct smb_ntsd *pntsd, int ntsd_len,
1380 bool type_check, bool get_write)
1383 struct smb_fattr fattr = {{0}};
1384 struct inode *inode = d_inode(path->dentry);
1385 struct mnt_idmap *idmap = mnt_idmap(path->mnt);
1386 struct iattr newattrs;
1388 fattr.cf_uid = INVALID_UID;
1389 fattr.cf_gid = INVALID_GID;
1390 fattr.cf_mode = inode->i_mode;
1392 rc = parse_sec_desc(idmap, pntsd, ntsd_len, &fattr);
1396 newattrs.ia_valid = ATTR_CTIME;
1397 if (!uid_eq(fattr.cf_uid, INVALID_UID)) {
1398 newattrs.ia_valid |= ATTR_UID;
1399 newattrs.ia_uid = fattr.cf_uid;
1401 if (!gid_eq(fattr.cf_gid, INVALID_GID)) {
1402 newattrs.ia_valid |= ATTR_GID;
1403 newattrs.ia_gid = fattr.cf_gid;
1405 newattrs.ia_valid |= ATTR_MODE;
1406 newattrs.ia_mode = (inode->i_mode & ~0777) | (fattr.cf_mode & 0777);
1408 ksmbd_vfs_remove_acl_xattrs(idmap, path);
1409 /* Update posix acls */
1410 if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && fattr.cf_dacls) {
1411 rc = set_posix_acl(idmap, path->dentry,
1412 ACL_TYPE_ACCESS, fattr.cf_acls);
1415 "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1417 if (S_ISDIR(inode->i_mode) && fattr.cf_dacls) {
1418 rc = set_posix_acl(idmap, path->dentry,
1419 ACL_TYPE_DEFAULT, fattr.cf_dacls);
1422 "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1428 rc = notify_change(idmap, path->dentry, &newattrs, NULL);
1429 inode_unlock(inode);
1433 /* Check it only calling from SD BUFFER context */
1434 if (type_check && !(le16_to_cpu(pntsd->type) & DACL_PRESENT))
1437 if (test_share_config_flag(tcon->share_conf, KSMBD_SHARE_FLAG_ACL_XATTR)) {
1438 /* Update WinACL in xattr */
1439 ksmbd_vfs_remove_sd_xattrs(idmap, path);
1440 ksmbd_vfs_set_sd_xattr(conn, idmap, path, pntsd, ntsd_len,
1445 posix_acl_release(fattr.cf_acls);
1446 posix_acl_release(fattr.cf_dacls);
1450 void ksmbd_init_domain(u32 *sub_auth)
1454 memcpy(&server_conf.domain_sid, &domain, sizeof(struct smb_sid));
1455 for (i = 0; i < 3; ++i)
1456 server_conf.domain_sid.sub_auth[i + 1] = cpu_to_le32(sub_auth[i]);