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>
14 #include "smb_common.h"
17 #include "mgmt/share_config.h"
19 static const struct smb_sid domain = {1, 4, {0, 0, 0, 0, 0, 5},
20 {cpu_to_le32(21), cpu_to_le32(1), cpu_to_le32(2), cpu_to_le32(3),
21 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
23 /* security id for everyone/world system group */
24 static const struct smb_sid creator_owner = {
25 1, 1, {0, 0, 0, 0, 0, 3}, {0} };
26 /* security id for everyone/world system group */
27 static const struct smb_sid creator_group = {
28 1, 1, {0, 0, 0, 0, 0, 3}, {cpu_to_le32(1)} };
30 /* security id for everyone/world system group */
31 static const struct smb_sid sid_everyone = {
32 1, 1, {0, 0, 0, 0, 0, 1}, {0} };
33 /* security id for Authenticated Users system group */
34 static const struct smb_sid sid_authusers = {
35 1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} };
37 /* S-1-22-1 Unmapped Unix users */
38 static const struct smb_sid sid_unix_users = {1, 1, {0, 0, 0, 0, 0, 22},
39 {cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
41 /* S-1-22-2 Unmapped Unix groups */
42 static const struct smb_sid sid_unix_groups = { 1, 1, {0, 0, 0, 0, 0, 22},
43 {cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
46 * See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx
49 /* S-1-5-88 MS NFS and Apple style UID/GID/mode */
51 /* S-1-5-88-1 Unix uid */
52 static const struct smb_sid sid_unix_NFS_users = { 1, 2, {0, 0, 0, 0, 0, 5},
54 cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
56 /* S-1-5-88-2 Unix gid */
57 static const struct smb_sid sid_unix_NFS_groups = { 1, 2, {0, 0, 0, 0, 0, 5},
59 cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
61 /* S-1-5-88-3 Unix mode */
62 static const struct smb_sid sid_unix_NFS_mode = { 1, 2, {0, 0, 0, 0, 0, 5},
64 cpu_to_le32(3), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
67 * if the two SIDs (roughly equivalent to a UUID for a user or group) are
68 * the same returns zero, if they do not match returns non-zero.
70 int compare_sids(const struct smb_sid *ctsid, const struct smb_sid *cwsid)
73 int num_subauth, num_sat, num_saw;
78 /* compare the revision */
79 if (ctsid->revision != cwsid->revision) {
80 if (ctsid->revision > cwsid->revision)
86 /* compare all of the six auth values */
87 for (i = 0; i < NUM_AUTHS; ++i) {
88 if (ctsid->authority[i] != cwsid->authority[i]) {
89 if (ctsid->authority[i] > cwsid->authority[i])
96 /* compare all of the subauth values if any */
97 num_sat = ctsid->num_subauth;
98 num_saw = cwsid->num_subauth;
99 num_subauth = num_sat < num_saw ? num_sat : num_saw;
101 for (i = 0; i < num_subauth; ++i) {
102 if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) {
103 if (le32_to_cpu(ctsid->sub_auth[i]) >
104 le32_to_cpu(cwsid->sub_auth[i]))
112 return 0; /* sids compare/match */
115 static void smb_copy_sid(struct smb_sid *dst, const struct smb_sid *src)
119 dst->revision = src->revision;
120 dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES);
121 for (i = 0; i < NUM_AUTHS; ++i)
122 dst->authority[i] = src->authority[i];
123 for (i = 0; i < dst->num_subauth; ++i)
124 dst->sub_auth[i] = src->sub_auth[i];
128 * change posix mode to reflect permissions
129 * pmode is the existing mode (we only want to overwrite part of this
130 * bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007
132 static umode_t access_flags_to_mode(struct smb_fattr *fattr, __le32 ace_flags,
135 __u32 flags = le32_to_cpu(ace_flags);
138 if (flags & GENERIC_ALL) {
140 ksmbd_debug(SMB, "all perms\n");
144 if ((flags & GENERIC_READ) || (flags & FILE_READ_RIGHTS))
146 if ((flags & GENERIC_WRITE) || (flags & FILE_WRITE_RIGHTS)) {
148 if (S_ISDIR(fattr->cf_mode))
151 if ((flags & GENERIC_EXECUTE) || (flags & FILE_EXEC_RIGHTS))
154 if (type == ACCESS_DENIED_ACE_TYPE || type == ACCESS_DENIED_OBJECT_ACE_TYPE)
157 ksmbd_debug(SMB, "access flags 0x%x mode now %04o\n", flags, mode);
163 * Generate access flags to reflect permissions mode is the existing mode.
164 * This function is called for every ACE in the DACL whose SID matches
165 * with either owner or group or everyone.
167 static void mode_to_access_flags(umode_t mode, umode_t bits_to_use,
170 /* reset access mask */
173 /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */
177 * check for R/W/X UGO since we do not know whose flags
178 * is this but we have cleared all the bits sans RWX for
179 * either user or group or other as per bits_to_use
182 *pace_flags |= SET_FILE_READ_RIGHTS;
184 *pace_flags |= FILE_WRITE_RIGHTS;
186 *pace_flags |= SET_FILE_EXEC_RIGHTS;
188 ksmbd_debug(SMB, "mode: %o, access flags now 0x%x\n",
192 static __u16 fill_ace_for_sid(struct smb_ace *pntace,
193 const struct smb_sid *psid, int type, int flags,
194 umode_t mode, umode_t bits)
198 __u32 access_req = 0;
201 pntace->flags = flags;
202 mode_to_access_flags(mode, bits, &access_req);
204 access_req = SET_MINIMUM_RIGHTS;
205 pntace->access_req = cpu_to_le32(access_req);
207 pntace->sid.revision = psid->revision;
208 pntace->sid.num_subauth = psid->num_subauth;
209 for (i = 0; i < NUM_AUTHS; i++)
210 pntace->sid.authority[i] = psid->authority[i];
211 for (i = 0; i < psid->num_subauth; i++)
212 pntace->sid.sub_auth[i] = psid->sub_auth[i];
214 size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4);
215 pntace->size = cpu_to_le16(size);
220 void id_to_sid(unsigned int cid, uint sidtype, struct smb_sid *ssid)
224 smb_copy_sid(ssid, &server_conf.domain_sid);
227 smb_copy_sid(ssid, &sid_unix_users);
230 smb_copy_sid(ssid, &sid_unix_groups);
232 case SIDCREATOR_OWNER:
233 smb_copy_sid(ssid, &creator_owner);
235 case SIDCREATOR_GROUP:
236 smb_copy_sid(ssid, &creator_group);
239 smb_copy_sid(ssid, &sid_unix_NFS_users);
242 smb_copy_sid(ssid, &sid_unix_NFS_groups);
245 smb_copy_sid(ssid, &sid_unix_NFS_mode);
252 ssid->sub_auth[ssid->num_subauth] = cpu_to_le32(cid);
256 static int sid_to_id(struct user_namespace *user_ns,
257 struct smb_sid *psid, uint sidtype,
258 struct smb_fattr *fattr)
263 * If we have too many subauthorities, then something is really wrong.
264 * Just return an error.
266 if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) {
267 pr_err("%s: %u subauthorities is too many!\n",
268 __func__, psid->num_subauth);
272 if (sidtype == SIDOWNER) {
276 id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]);
278 uid = make_kuid(user_ns, id);
279 if (uid_valid(uid) && kuid_has_mapping(user_ns, uid)) {
288 id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]);
290 gid = make_kgid(user_ns, id);
291 if (gid_valid(gid) && kgid_has_mapping(user_ns, gid)) {
301 void posix_state_to_acl(struct posix_acl_state *state,
302 struct posix_acl_entry *pace)
306 pace->e_tag = ACL_USER_OBJ;
307 pace->e_perm = state->owner.allow;
308 for (i = 0; i < state->users->n; i++) {
310 pace->e_tag = ACL_USER;
311 pace->e_uid = state->users->aces[i].uid;
312 pace->e_perm = state->users->aces[i].perms.allow;
316 pace->e_tag = ACL_GROUP_OBJ;
317 pace->e_perm = state->group.allow;
319 for (i = 0; i < state->groups->n; i++) {
321 pace->e_tag = ACL_GROUP;
322 pace->e_gid = state->groups->aces[i].gid;
323 pace->e_perm = state->groups->aces[i].perms.allow;
326 if (state->users->n || state->groups->n) {
328 pace->e_tag = ACL_MASK;
329 pace->e_perm = state->mask.allow;
333 pace->e_tag = ACL_OTHER;
334 pace->e_perm = state->other.allow;
337 int init_acl_state(struct posix_acl_state *state, int cnt)
341 memset(state, 0, sizeof(struct posix_acl_state));
343 * In the worst case, each individual acl could be for a distinct
344 * named user or group, but we don't know which, so we allocate
345 * enough space for either:
347 alloc = sizeof(struct posix_ace_state_array)
348 + cnt * sizeof(struct posix_user_ace_state);
349 state->users = kzalloc(alloc, GFP_KERNEL);
352 state->groups = kzalloc(alloc, GFP_KERNEL);
353 if (!state->groups) {
360 void free_acl_state(struct posix_acl_state *state)
363 kfree(state->groups);
366 static void parse_dacl(struct user_namespace *user_ns,
367 struct smb_acl *pdacl, char *end_of_acl,
368 struct smb_sid *pownersid, struct smb_sid *pgrpsid,
369 struct smb_fattr *fattr)
375 struct smb_ace **ppace;
376 struct posix_acl_entry *cf_pace, *cf_pdace;
377 struct posix_acl_state acl_state, default_acl_state;
378 umode_t mode = 0, acl_mode;
379 bool owner_found = false, group_found = false, others_found = false;
384 /* validate that we do not go past end of acl */
385 if (end_of_acl <= (char *)pdacl ||
386 end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
387 pr_err("ACL too small to parse DACL\n");
391 ksmbd_debug(SMB, "DACL revision %d size %d num aces %d\n",
392 le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
393 le32_to_cpu(pdacl->num_aces));
395 acl_base = (char *)pdacl;
396 acl_size = sizeof(struct smb_acl);
398 num_aces = le32_to_cpu(pdacl->num_aces);
402 if (num_aces > ULONG_MAX / sizeof(struct smb_ace *))
405 ppace = kmalloc_array(num_aces, sizeof(struct smb_ace *), GFP_KERNEL);
409 ret = init_acl_state(&acl_state, num_aces);
412 ret = init_acl_state(&default_acl_state, num_aces);
414 free_acl_state(&acl_state);
419 * reset rwx permissions for user/group/other.
420 * Also, if num_aces is 0 i.e. DACL has no ACEs,
421 * user/group/other have no permissions
423 for (i = 0; i < num_aces; ++i) {
424 ppace[i] = (struct smb_ace *)(acl_base + acl_size);
425 acl_base = (char *)ppace[i];
426 acl_size = le16_to_cpu(ppace[i]->size);
427 ppace[i]->access_req =
428 smb_map_generic_desired_access(ppace[i]->access_req);
430 if (!(compare_sids(&ppace[i]->sid, &sid_unix_NFS_mode))) {
432 le32_to_cpu(ppace[i]->sid.sub_auth[2]);
434 } else if (!compare_sids(&ppace[i]->sid, pownersid)) {
435 acl_mode = access_flags_to_mode(fattr,
436 ppace[i]->access_req,
445 } else if (!compare_sids(&ppace[i]->sid, pgrpsid) ||
446 ppace[i]->sid.sub_auth[ppace[i]->sid.num_subauth - 1] ==
447 DOMAIN_USER_RID_LE) {
448 acl_mode = access_flags_to_mode(fattr,
449 ppace[i]->access_req,
457 } else if (!compare_sids(&ppace[i]->sid, &sid_everyone)) {
458 acl_mode = access_flags_to_mode(fattr,
459 ppace[i]->access_req,
467 } else if (!compare_sids(&ppace[i]->sid, &creator_owner)) {
469 } else if (!compare_sids(&ppace[i]->sid, &creator_group)) {
471 } else if (!compare_sids(&ppace[i]->sid, &sid_authusers)) {
474 struct smb_fattr temp_fattr;
476 acl_mode = access_flags_to_mode(fattr, ppace[i]->access_req,
478 temp_fattr.cf_uid = INVALID_UID;
479 ret = sid_to_id(user_ns, &ppace[i]->sid, SIDOWNER, &temp_fattr);
480 if (ret || uid_eq(temp_fattr.cf_uid, INVALID_UID)) {
481 pr_err("%s: Error %d mapping Owner SID to uid\n",
486 acl_state.owner.allow = ((acl_mode & 0700) >> 6) | 0004;
487 acl_state.users->aces[acl_state.users->n].uid =
489 acl_state.users->aces[acl_state.users->n++].perms.allow =
490 ((acl_mode & 0700) >> 6) | 0004;
491 default_acl_state.owner.allow = ((acl_mode & 0700) >> 6) | 0004;
492 default_acl_state.users->aces[default_acl_state.users->n].uid =
494 default_acl_state.users->aces[default_acl_state.users->n++].perms.allow =
495 ((acl_mode & 0700) >> 6) | 0004;
501 /* The owner must be set to at least read-only. */
502 acl_state.owner.allow = ((mode & 0700) >> 6) | 0004;
503 acl_state.users->aces[acl_state.users->n].uid = fattr->cf_uid;
504 acl_state.users->aces[acl_state.users->n++].perms.allow =
505 ((mode & 0700) >> 6) | 0004;
506 default_acl_state.owner.allow = ((mode & 0700) >> 6) | 0004;
507 default_acl_state.users->aces[default_acl_state.users->n].uid =
509 default_acl_state.users->aces[default_acl_state.users->n++].perms.allow =
510 ((mode & 0700) >> 6) | 0004;
514 acl_state.group.allow = (mode & 0070) >> 3;
515 acl_state.groups->aces[acl_state.groups->n].gid =
517 acl_state.groups->aces[acl_state.groups->n++].perms.allow =
519 default_acl_state.group.allow = (mode & 0070) >> 3;
520 default_acl_state.groups->aces[default_acl_state.groups->n].gid =
522 default_acl_state.groups->aces[default_acl_state.groups->n++].perms.allow =
527 fattr->cf_mode &= ~(0007);
528 fattr->cf_mode |= mode & 0007;
530 acl_state.other.allow = mode & 0007;
531 default_acl_state.other.allow = mode & 0007;
534 if (acl_state.users->n || acl_state.groups->n) {
535 acl_state.mask.allow = 0x07;
537 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
539 posix_acl_alloc(acl_state.users->n +
540 acl_state.groups->n + 4, GFP_KERNEL);
541 if (fattr->cf_acls) {
542 cf_pace = fattr->cf_acls->a_entries;
543 posix_state_to_acl(&acl_state, cf_pace);
548 if (default_acl_state.users->n || default_acl_state.groups->n) {
549 default_acl_state.mask.allow = 0x07;
551 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
553 posix_acl_alloc(default_acl_state.users->n +
554 default_acl_state.groups->n + 4, GFP_KERNEL);
555 if (fattr->cf_dacls) {
556 cf_pdace = fattr->cf_dacls->a_entries;
557 posix_state_to_acl(&default_acl_state, cf_pdace);
561 free_acl_state(&acl_state);
562 free_acl_state(&default_acl_state);
565 static void set_posix_acl_entries_dacl(struct user_namespace *user_ns,
566 struct smb_ace *pndace,
567 struct smb_fattr *fattr, u32 *num_aces,
568 u16 *size, u32 nt_aces_num)
570 struct posix_acl_entry *pace;
572 struct smb_ace *ntace;
576 goto posix_default_acl;
578 pace = fattr->cf_acls->a_entries;
579 for (i = 0; i < fattr->cf_acls->a_count; i++, pace++) {
582 sid = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
586 if (pace->e_tag == ACL_USER) {
588 unsigned int sid_type = SIDOWNER;
590 uid = from_kuid(user_ns, pace->e_uid);
592 sid_type = SIDUNIX_USER;
593 id_to_sid(uid, sid_type, sid);
594 } else if (pace->e_tag == ACL_GROUP) {
597 gid = from_kgid(user_ns, pace->e_gid);
598 id_to_sid(gid, SIDUNIX_GROUP, sid);
599 } else if (pace->e_tag == ACL_OTHER && !nt_aces_num) {
600 smb_copy_sid(sid, &sid_everyone);
606 for (j = 0; j < nt_aces_num; j++) {
607 if (ntace->sid.sub_auth[ntace->sid.num_subauth - 1] ==
608 sid->sub_auth[sid->num_subauth - 1])
610 ntace = (struct smb_ace *)((char *)ntace +
611 le16_to_cpu(ntace->size));
614 if (S_ISDIR(fattr->cf_mode) && pace->e_tag == ACL_OTHER)
617 ntace = (struct smb_ace *)((char *)pndace + *size);
618 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, flags,
621 if (pace->e_tag == ACL_USER)
623 FILE_DELETE_LE | FILE_DELETE_CHILD_LE;
625 if (S_ISDIR(fattr->cf_mode) &&
626 (pace->e_tag == ACL_USER || pace->e_tag == ACL_GROUP)) {
627 ntace = (struct smb_ace *)((char *)pndace + *size);
628 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED,
629 0x03, pace->e_perm, 0777);
631 if (pace->e_tag == ACL_USER)
633 FILE_DELETE_LE | FILE_DELETE_CHILD_LE;
644 if (!fattr->cf_dacls)
647 pace = fattr->cf_dacls->a_entries;
648 for (i = 0; i < fattr->cf_dacls->a_count; i++, pace++) {
649 sid = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
653 if (pace->e_tag == ACL_USER) {
656 uid = from_kuid(user_ns, pace->e_uid);
657 id_to_sid(uid, SIDCREATOR_OWNER, sid);
658 } else if (pace->e_tag == ACL_GROUP) {
661 gid = from_kgid(user_ns, pace->e_gid);
662 id_to_sid(gid, SIDCREATOR_GROUP, sid);
668 ntace = (struct smb_ace *)((char *)pndace + *size);
669 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, 0x0b,
672 if (pace->e_tag == ACL_USER)
674 FILE_DELETE_LE | FILE_DELETE_CHILD_LE;
679 static void set_ntacl_dacl(struct user_namespace *user_ns,
680 struct smb_acl *pndacl,
681 struct smb_acl *nt_dacl,
682 const struct smb_sid *pownersid,
683 const struct smb_sid *pgrpsid,
684 struct smb_fattr *fattr)
686 struct smb_ace *ntace, *pndace;
687 int nt_num_aces = le32_to_cpu(nt_dacl->num_aces), num_aces = 0;
688 unsigned short size = 0;
691 pndace = (struct smb_ace *)((char *)pndacl + sizeof(struct smb_acl));
693 ntace = (struct smb_ace *)((char *)nt_dacl + sizeof(struct smb_acl));
694 for (i = 0; i < nt_num_aces; i++) {
695 memcpy((char *)pndace + size, ntace, le16_to_cpu(ntace->size));
696 size += le16_to_cpu(ntace->size);
697 ntace = (struct smb_ace *)((char *)ntace + le16_to_cpu(ntace->size));
702 set_posix_acl_entries_dacl(user_ns, pndace, fattr,
703 &num_aces, &size, nt_num_aces);
704 pndacl->num_aces = cpu_to_le32(num_aces);
705 pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size);
708 static void set_mode_dacl(struct user_namespace *user_ns,
709 struct smb_acl *pndacl, struct smb_fattr *fattr)
711 struct smb_ace *pace, *pndace;
713 u16 size = 0, ace_size = 0;
715 const struct smb_sid *sid;
717 pace = pndace = (struct smb_ace *)((char *)pndacl + sizeof(struct smb_acl));
719 if (fattr->cf_acls) {
720 set_posix_acl_entries_dacl(user_ns, pndace, fattr,
721 &num_aces, &size, num_aces);
726 uid = from_kuid(user_ns, fattr->cf_uid);
728 sid = &server_conf.domain_sid;
730 sid = &sid_unix_users;
731 ace_size = fill_ace_for_sid(pace, sid, ACCESS_ALLOWED, 0,
732 fattr->cf_mode, 0700);
733 pace->sid.sub_auth[pace->sid.num_subauth++] = cpu_to_le32(uid);
734 pace->size = cpu_to_le16(ace_size + 4);
735 size += le16_to_cpu(pace->size);
736 pace = (struct smb_ace *)((char *)pndace + size);
739 ace_size = fill_ace_for_sid(pace, &sid_unix_groups,
740 ACCESS_ALLOWED, 0, fattr->cf_mode, 0070);
741 pace->sid.sub_auth[pace->sid.num_subauth++] =
742 cpu_to_le32(from_kgid(user_ns, fattr->cf_gid));
743 pace->size = cpu_to_le16(ace_size + 4);
744 size += le16_to_cpu(pace->size);
745 pace = (struct smb_ace *)((char *)pndace + size);
748 if (S_ISDIR(fattr->cf_mode)) {
749 pace = (struct smb_ace *)((char *)pndace + size);
752 size += fill_ace_for_sid(pace, &creator_owner, ACCESS_ALLOWED,
753 0x0b, fattr->cf_mode, 0700);
754 pace = (struct smb_ace *)((char *)pndace + size);
757 size += fill_ace_for_sid(pace, &creator_group, ACCESS_ALLOWED,
758 0x0b, fattr->cf_mode, 0070);
759 pace = (struct smb_ace *)((char *)pndace + size);
764 size += fill_ace_for_sid(pace, &sid_everyone, ACCESS_ALLOWED, 0,
765 fattr->cf_mode, 0007);
768 pndacl->num_aces = cpu_to_le32(num_aces);
769 pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size);
772 static int parse_sid(struct smb_sid *psid, char *end_of_acl)
775 * validate that we do not go past end of ACL - sid must be at least 8
776 * bytes long (assuming no sub-auths - e.g. the null SID
778 if (end_of_acl < (char *)psid + 8) {
779 pr_err("ACL too small to parse SID %p\n", psid);
786 /* Convert CIFS ACL to POSIX form */
787 int parse_sec_desc(struct user_namespace *user_ns, struct smb_ntsd *pntsd,
788 int acl_len, struct smb_fattr *fattr)
791 struct smb_sid *owner_sid_ptr, *group_sid_ptr;
792 struct smb_acl *dacl_ptr; /* no need for SACL ptr */
793 char *end_of_acl = ((char *)pntsd) + acl_len;
800 owner_sid_ptr = (struct smb_sid *)((char *)pntsd +
801 le32_to_cpu(pntsd->osidoffset));
802 group_sid_ptr = (struct smb_sid *)((char *)pntsd +
803 le32_to_cpu(pntsd->gsidoffset));
804 dacloffset = le32_to_cpu(pntsd->dacloffset);
805 dacl_ptr = (struct smb_acl *)((char *)pntsd + dacloffset);
807 "revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n",
808 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),
809 le32_to_cpu(pntsd->gsidoffset),
810 le32_to_cpu(pntsd->sacloffset), dacloffset);
812 pntsd_type = le16_to_cpu(pntsd->type);
813 if (!(pntsd_type & DACL_PRESENT)) {
814 ksmbd_debug(SMB, "DACL_PRESENT in DACL type is not set\n");
818 pntsd->type = cpu_to_le16(DACL_PRESENT);
820 if (pntsd->osidoffset) {
821 rc = parse_sid(owner_sid_ptr, end_of_acl);
823 pr_err("%s: Error %d parsing Owner SID\n", __func__, rc);
827 rc = sid_to_id(user_ns, owner_sid_ptr, SIDOWNER, fattr);
829 pr_err("%s: Error %d mapping Owner SID to uid\n",
831 owner_sid_ptr = NULL;
835 if (pntsd->gsidoffset) {
836 rc = parse_sid(group_sid_ptr, end_of_acl);
838 pr_err("%s: Error %d mapping Owner SID to gid\n",
842 rc = sid_to_id(user_ns, group_sid_ptr, SIDUNIX_GROUP, fattr);
844 pr_err("%s: Error %d mapping Group SID to gid\n",
846 group_sid_ptr = NULL;
850 if ((pntsd_type & (DACL_AUTO_INHERITED | DACL_AUTO_INHERIT_REQ)) ==
851 (DACL_AUTO_INHERITED | DACL_AUTO_INHERIT_REQ))
852 pntsd->type |= cpu_to_le16(DACL_AUTO_INHERITED);
853 if (pntsd_type & DACL_PROTECTED)
854 pntsd->type |= cpu_to_le16(DACL_PROTECTED);
857 parse_dacl(user_ns, dacl_ptr, end_of_acl,
858 owner_sid_ptr, group_sid_ptr, fattr);
864 /* Convert permission bits from mode to equivalent CIFS ACL */
865 int build_sec_desc(struct user_namespace *user_ns,
866 struct smb_ntsd *pntsd, struct smb_ntsd *ppntsd,
867 int addition_info, __u32 *secdesclen,
868 struct smb_fattr *fattr)
872 struct smb_sid *owner_sid_ptr, *group_sid_ptr;
873 struct smb_sid *nowner_sid_ptr, *ngroup_sid_ptr;
874 struct smb_acl *dacl_ptr = NULL; /* no need for SACL ptr */
877 unsigned int sid_type = SIDOWNER;
879 nowner_sid_ptr = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
883 uid = from_kuid(user_ns, fattr->cf_uid);
885 sid_type = SIDUNIX_USER;
886 id_to_sid(uid, sid_type, nowner_sid_ptr);
888 ngroup_sid_ptr = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
889 if (!ngroup_sid_ptr) {
890 kfree(nowner_sid_ptr);
894 gid = from_kgid(user_ns, fattr->cf_gid);
895 id_to_sid(gid, SIDUNIX_GROUP, ngroup_sid_ptr);
897 offset = sizeof(struct smb_ntsd);
898 pntsd->sacloffset = 0;
899 pntsd->revision = cpu_to_le16(1);
900 pntsd->type = cpu_to_le16(SELF_RELATIVE);
902 pntsd->type |= ppntsd->type;
904 if (addition_info & OWNER_SECINFO) {
905 pntsd->osidoffset = cpu_to_le32(offset);
906 owner_sid_ptr = (struct smb_sid *)((char *)pntsd + offset);
907 smb_copy_sid(owner_sid_ptr, nowner_sid_ptr);
908 offset += 1 + 1 + 6 + (nowner_sid_ptr->num_subauth * 4);
911 if (addition_info & GROUP_SECINFO) {
912 pntsd->gsidoffset = cpu_to_le32(offset);
913 group_sid_ptr = (struct smb_sid *)((char *)pntsd + offset);
914 smb_copy_sid(group_sid_ptr, ngroup_sid_ptr);
915 offset += 1 + 1 + 6 + (ngroup_sid_ptr->num_subauth * 4);
918 if (addition_info & DACL_SECINFO) {
919 pntsd->type |= cpu_to_le16(DACL_PRESENT);
920 dacl_ptr = (struct smb_acl *)((char *)pntsd + offset);
921 dacl_ptr->revision = cpu_to_le16(2);
922 dacl_ptr->size = cpu_to_le16(sizeof(struct smb_acl));
923 dacl_ptr->num_aces = 0;
926 set_mode_dacl(user_ns, dacl_ptr, fattr);
927 } else if (!ppntsd->dacloffset) {
930 struct smb_acl *ppdacl_ptr;
932 ppdacl_ptr = (struct smb_acl *)((char *)ppntsd +
933 le32_to_cpu(ppntsd->dacloffset));
934 set_ntacl_dacl(user_ns, dacl_ptr, ppdacl_ptr,
935 nowner_sid_ptr, ngroup_sid_ptr, fattr);
937 pntsd->dacloffset = cpu_to_le32(offset);
938 offset += le16_to_cpu(dacl_ptr->size);
942 kfree(nowner_sid_ptr);
943 kfree(ngroup_sid_ptr);
944 *secdesclen = offset;
948 static void smb_set_ace(struct smb_ace *ace, const struct smb_sid *sid, u8 type,
949 u8 flags, __le32 access_req)
953 ace->access_req = access_req;
954 smb_copy_sid(&ace->sid, sid);
955 ace->size = cpu_to_le16(1 + 1 + 2 + 4 + 1 + 1 + 6 + (sid->num_subauth * 4));
958 int smb_inherit_dacl(struct ksmbd_conn *conn,
960 unsigned int uid, unsigned int gid)
962 const struct smb_sid *psid, *creator = NULL;
963 struct smb_ace *parent_aces, *aces;
964 struct smb_acl *parent_pdacl;
965 struct smb_ntsd *parent_pntsd = NULL;
966 struct smb_sid owner_sid, group_sid;
967 struct dentry *parent = path->dentry->d_parent;
968 struct user_namespace *user_ns = mnt_user_ns(path->mnt);
969 int inherited_flags = 0, flags = 0, i, ace_cnt = 0, nt_size = 0;
970 int rc = 0, num_aces, dacloffset, pntsd_type, acl_len;
972 bool is_dir = S_ISDIR(d_inode(path->dentry)->i_mode);
974 acl_len = ksmbd_vfs_get_sd_xattr(conn, user_ns,
975 parent, &parent_pntsd);
978 dacloffset = le32_to_cpu(parent_pntsd->dacloffset);
981 goto free_parent_pntsd;
984 parent_pdacl = (struct smb_acl *)((char *)parent_pntsd + dacloffset);
985 num_aces = le32_to_cpu(parent_pdacl->num_aces);
986 pntsd_type = le16_to_cpu(parent_pntsd->type);
988 aces_base = kmalloc(sizeof(struct smb_ace) * num_aces * 2, GFP_KERNEL);
991 goto free_parent_pntsd;
994 aces = (struct smb_ace *)aces_base;
995 parent_aces = (struct smb_ace *)((char *)parent_pdacl +
996 sizeof(struct smb_acl));
998 if (pntsd_type & DACL_AUTO_INHERITED)
999 inherited_flags = INHERITED_ACE;
1001 for (i = 0; i < num_aces; i++) {
1002 flags = parent_aces->flags;
1003 if (!smb_inherit_flags(flags, is_dir))
1006 flags &= ~(INHERIT_ONLY_ACE | INHERITED_ACE);
1007 if (!(flags & CONTAINER_INHERIT_ACE))
1008 flags |= INHERIT_ONLY_ACE;
1009 if (flags & NO_PROPAGATE_INHERIT_ACE)
1015 if (!compare_sids(&creator_owner, &parent_aces->sid)) {
1016 creator = &creator_owner;
1017 id_to_sid(uid, SIDOWNER, &owner_sid);
1019 } else if (!compare_sids(&creator_group, &parent_aces->sid)) {
1020 creator = &creator_group;
1021 id_to_sid(gid, SIDUNIX_GROUP, &group_sid);
1025 psid = &parent_aces->sid;
1028 if (is_dir && creator && flags & CONTAINER_INHERIT_ACE) {
1029 smb_set_ace(aces, psid, parent_aces->type, inherited_flags,
1030 parent_aces->access_req);
1031 nt_size += le16_to_cpu(aces->size);
1033 aces = (struct smb_ace *)((char *)aces + le16_to_cpu(aces->size));
1034 flags |= INHERIT_ONLY_ACE;
1036 } else if (is_dir && !(parent_aces->flags & NO_PROPAGATE_INHERIT_ACE)) {
1037 psid = &parent_aces->sid;
1040 smb_set_ace(aces, psid, parent_aces->type, flags | inherited_flags,
1041 parent_aces->access_req);
1042 nt_size += le16_to_cpu(aces->size);
1043 aces = (struct smb_ace *)((char *)aces + le16_to_cpu(aces->size));
1047 (struct smb_ace *)((char *)parent_aces + le16_to_cpu(parent_aces->size));
1051 struct smb_ntsd *pntsd;
1052 struct smb_acl *pdacl;
1053 struct smb_sid *powner_sid = NULL, *pgroup_sid = NULL;
1054 int powner_sid_size = 0, pgroup_sid_size = 0, pntsd_size;
1056 if (parent_pntsd->osidoffset) {
1057 powner_sid = (struct smb_sid *)((char *)parent_pntsd +
1058 le32_to_cpu(parent_pntsd->osidoffset));
1059 powner_sid_size = 1 + 1 + 6 + (powner_sid->num_subauth * 4);
1061 if (parent_pntsd->gsidoffset) {
1062 pgroup_sid = (struct smb_sid *)((char *)parent_pntsd +
1063 le32_to_cpu(parent_pntsd->gsidoffset));
1064 pgroup_sid_size = 1 + 1 + 6 + (pgroup_sid->num_subauth * 4);
1067 pntsd = kzalloc(sizeof(struct smb_ntsd) + powner_sid_size +
1068 pgroup_sid_size + sizeof(struct smb_acl) +
1069 nt_size, GFP_KERNEL);
1072 goto free_aces_base;
1075 pntsd->revision = cpu_to_le16(1);
1076 pntsd->type = cpu_to_le16(SELF_RELATIVE | DACL_PRESENT);
1077 if (le16_to_cpu(parent_pntsd->type) & DACL_AUTO_INHERITED)
1078 pntsd->type |= cpu_to_le16(DACL_AUTO_INHERITED);
1079 pntsd_size = sizeof(struct smb_ntsd);
1080 pntsd->osidoffset = parent_pntsd->osidoffset;
1081 pntsd->gsidoffset = parent_pntsd->gsidoffset;
1082 pntsd->dacloffset = parent_pntsd->dacloffset;
1084 if (pntsd->osidoffset) {
1085 struct smb_sid *owner_sid = (struct smb_sid *)((char *)pntsd +
1086 le32_to_cpu(pntsd->osidoffset));
1087 memcpy(owner_sid, powner_sid, powner_sid_size);
1088 pntsd_size += powner_sid_size;
1091 if (pntsd->gsidoffset) {
1092 struct smb_sid *group_sid = (struct smb_sid *)((char *)pntsd +
1093 le32_to_cpu(pntsd->gsidoffset));
1094 memcpy(group_sid, pgroup_sid, pgroup_sid_size);
1095 pntsd_size += pgroup_sid_size;
1098 if (pntsd->dacloffset) {
1099 struct smb_ace *pace;
1101 pdacl = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset));
1102 pdacl->revision = cpu_to_le16(2);
1103 pdacl->size = cpu_to_le16(sizeof(struct smb_acl) + nt_size);
1104 pdacl->num_aces = cpu_to_le32(ace_cnt);
1105 pace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl));
1106 memcpy(pace, aces_base, nt_size);
1107 pntsd_size += sizeof(struct smb_acl) + nt_size;
1110 ksmbd_vfs_set_sd_xattr(conn, user_ns,
1111 path->dentry, pntsd, pntsd_size);
1118 kfree(parent_pntsd);
1122 bool smb_inherit_flags(int flags, bool is_dir)
1125 return (flags & OBJECT_INHERIT_ACE) != 0;
1127 if (flags & OBJECT_INHERIT_ACE && !(flags & NO_PROPAGATE_INHERIT_ACE))
1130 if (flags & CONTAINER_INHERIT_ACE)
1135 int smb_check_perm_dacl(struct ksmbd_conn *conn, struct path *path,
1136 __le32 *pdaccess, int uid)
1138 struct user_namespace *user_ns = mnt_user_ns(path->mnt);
1139 struct smb_ntsd *pntsd = NULL;
1140 struct smb_acl *pdacl;
1141 struct posix_acl *posix_acls;
1142 int rc = 0, acl_size;
1144 int granted = le32_to_cpu(*pdaccess & ~FILE_MAXIMAL_ACCESS_LE);
1145 struct smb_ace *ace;
1147 unsigned int access_bits = 0;
1148 struct smb_ace *others_ace = NULL;
1149 struct posix_acl_entry *pa_entry;
1150 unsigned int sid_type = SIDOWNER;
1153 ksmbd_debug(SMB, "check permission using windows acl\n");
1154 acl_size = ksmbd_vfs_get_sd_xattr(conn, user_ns,
1155 path->dentry, &pntsd);
1156 if (acl_size <= 0 || !pntsd || !pntsd->dacloffset) {
1161 pdacl = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset));
1162 end_of_acl = ((char *)pntsd) + acl_size;
1163 if (end_of_acl <= (char *)pdacl) {
1168 if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size) ||
1169 le16_to_cpu(pdacl->size) < sizeof(struct smb_acl)) {
1174 if (!pdacl->num_aces) {
1175 if (!(le16_to_cpu(pdacl->size) - sizeof(struct smb_acl)) &&
1176 *pdaccess & ~(FILE_READ_CONTROL_LE | FILE_WRITE_DAC_LE)) {
1184 if (*pdaccess & FILE_MAXIMAL_ACCESS_LE) {
1185 granted = READ_CONTROL | WRITE_DAC | FILE_READ_ATTRIBUTES |
1188 ace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl));
1189 for (i = 0; i < le32_to_cpu(pdacl->num_aces); i++) {
1190 granted |= le32_to_cpu(ace->access_req);
1191 ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size));
1192 if (end_of_acl < (char *)ace)
1196 if (!pdacl->num_aces)
1197 granted = GENERIC_ALL_FLAGS;
1201 sid_type = SIDUNIX_USER;
1202 id_to_sid(uid, sid_type, &sid);
1204 ace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl));
1205 for (i = 0; i < le32_to_cpu(pdacl->num_aces); i++) {
1206 if (!compare_sids(&sid, &ace->sid) ||
1207 !compare_sids(&sid_unix_NFS_mode, &ace->sid)) {
1211 if (!compare_sids(&sid_everyone, &ace->sid))
1214 ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size));
1215 if (end_of_acl < (char *)ace)
1219 if (*pdaccess & FILE_MAXIMAL_ACCESS_LE && found) {
1220 granted = READ_CONTROL | WRITE_DAC | FILE_READ_ATTRIBUTES |
1223 granted |= le32_to_cpu(ace->access_req);
1225 if (!pdacl->num_aces)
1226 granted = GENERIC_ALL_FLAGS;
1229 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
1230 posix_acls = get_acl(d_inode(path->dentry), ACL_TYPE_ACCESS);
1231 if (posix_acls && !found) {
1232 unsigned int id = -1;
1234 pa_entry = posix_acls->a_entries;
1235 for (i = 0; i < posix_acls->a_count; i++, pa_entry++) {
1236 if (pa_entry->e_tag == ACL_USER)
1237 id = from_kuid(user_ns,
1239 else if (pa_entry->e_tag == ACL_GROUP)
1240 id = from_kgid(user_ns,
1246 mode_to_access_flags(pa_entry->e_perm,
1252 goto check_access_bits;
1257 posix_acl_release(posix_acls);
1264 ksmbd_debug(SMB, "Can't find corresponding sid\n");
1270 switch (ace->type) {
1271 case ACCESS_ALLOWED_ACE_TYPE:
1272 access_bits = le32_to_cpu(ace->access_req);
1274 case ACCESS_DENIED_ACE_TYPE:
1275 case ACCESS_DENIED_CALLBACK_ACE_TYPE:
1276 access_bits = le32_to_cpu(~ace->access_req);
1282 ~(access_bits | FILE_READ_ATTRIBUTES | READ_CONTROL | WRITE_DAC | DELETE)) {
1283 ksmbd_debug(SMB, "Access denied with winACL, granted : %x, access_req : %x\n",
1284 granted, le32_to_cpu(ace->access_req));
1289 *pdaccess = cpu_to_le32(granted);
1295 int set_info_sec(struct ksmbd_conn *conn, struct ksmbd_tree_connect *tcon,
1296 struct path *path, struct smb_ntsd *pntsd, int ntsd_len,
1300 struct smb_fattr fattr = {{0}};
1301 struct inode *inode = d_inode(path->dentry);
1302 struct user_namespace *user_ns = mnt_user_ns(path->mnt);
1303 struct iattr newattrs;
1305 fattr.cf_uid = INVALID_UID;
1306 fattr.cf_gid = INVALID_GID;
1307 fattr.cf_mode = inode->i_mode;
1309 rc = parse_sec_desc(user_ns, pntsd, ntsd_len, &fattr);
1313 newattrs.ia_valid = ATTR_CTIME;
1314 if (!uid_eq(fattr.cf_uid, INVALID_UID)) {
1315 newattrs.ia_valid |= ATTR_UID;
1316 newattrs.ia_uid = fattr.cf_uid;
1318 if (!gid_eq(fattr.cf_gid, INVALID_GID)) {
1319 newattrs.ia_valid |= ATTR_GID;
1320 newattrs.ia_gid = fattr.cf_gid;
1322 newattrs.ia_valid |= ATTR_MODE;
1323 newattrs.ia_mode = (inode->i_mode & ~0777) | (fattr.cf_mode & 0777);
1326 rc = notify_change(user_ns, path->dentry, &newattrs, NULL);
1327 inode_unlock(inode);
1331 ksmbd_vfs_remove_acl_xattrs(user_ns, path->dentry);
1332 /* Update posix acls */
1333 if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && fattr.cf_dacls) {
1334 rc = set_posix_acl(user_ns, inode,
1335 ACL_TYPE_ACCESS, fattr.cf_acls);
1336 if (S_ISDIR(inode->i_mode) && fattr.cf_dacls)
1337 rc = set_posix_acl(user_ns, inode,
1338 ACL_TYPE_DEFAULT, fattr.cf_dacls);
1341 /* Check it only calling from SD BUFFER context */
1342 if (type_check && !(le16_to_cpu(pntsd->type) & DACL_PRESENT))
1345 if (test_share_config_flag(tcon->share_conf, KSMBD_SHARE_FLAG_ACL_XATTR)) {
1346 /* Update WinACL in xattr */
1347 ksmbd_vfs_remove_sd_xattrs(user_ns, path->dentry);
1348 ksmbd_vfs_set_sd_xattr(conn, user_ns,
1349 path->dentry, pntsd, ntsd_len);
1353 posix_acl_release(fattr.cf_acls);
1354 posix_acl_release(fattr.cf_dacls);
1355 mark_inode_dirty(inode);
1359 void ksmbd_init_domain(u32 *sub_auth)
1363 memcpy(&server_conf.domain_sid, &domain, sizeof(struct smb_sid));
1364 for (i = 0; i < 3; ++i)
1365 server_conf.domain_sid.sub_auth[i + 1] = cpu_to_le32(sub_auth[i]);