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smbacl.c
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smbacl.c
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// SPDX-License-Identifier: LGPL-2.1+
/*
* Copyright (C) International Business Machines Corp., 2007,2008
* Author(s): Steve French (sfrench@us.ibm.com)
* Copyright (C) 2020 Samsung Electronics Co., Ltd.
* Author(s): Namjae Jeon <linkinjeon@kernel.org>
*/
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/mnt_idmapping.h>
#include "smbacl.h"
#include "smb_common.h"
#include "server.h"
#include "misc.h"
#include "mgmt/share_config.h"
static const struct smb_sid domain = {1, 4, {0, 0, 0, 0, 0, 5},
{cpu_to_le32(21), cpu_to_le32(1), cpu_to_le32(2), cpu_to_le32(3),
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
/* security id for everyone/world system group */
static const struct smb_sid creator_owner = {
1, 1, {0, 0, 0, 0, 0, 3}, {0} };
/* security id for everyone/world system group */
static const struct smb_sid creator_group = {
1, 1, {0, 0, 0, 0, 0, 3}, {cpu_to_le32(1)} };
/* security id for everyone/world system group */
static const struct smb_sid sid_everyone = {
1, 1, {0, 0, 0, 0, 0, 1}, {0} };
/* security id for Authenticated Users system group */
static const struct smb_sid sid_authusers = {
1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} };
/* S-1-22-1 Unmapped Unix users */
static const struct smb_sid sid_unix_users = {1, 1, {0, 0, 0, 0, 0, 22},
{cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
/* S-1-22-2 Unmapped Unix groups */
static const struct smb_sid sid_unix_groups = { 1, 1, {0, 0, 0, 0, 0, 22},
{cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
/*
* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx
*/
/* S-1-5-88 MS NFS and Apple style UID/GID/mode */
/* S-1-5-88-1 Unix uid */
static const struct smb_sid sid_unix_NFS_users = { 1, 2, {0, 0, 0, 0, 0, 5},
{cpu_to_le32(88),
cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
/* S-1-5-88-2 Unix gid */
static const struct smb_sid sid_unix_NFS_groups = { 1, 2, {0, 0, 0, 0, 0, 5},
{cpu_to_le32(88),
cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
/* S-1-5-88-3 Unix mode */
static const struct smb_sid sid_unix_NFS_mode = { 1, 2, {0, 0, 0, 0, 0, 5},
{cpu_to_le32(88),
cpu_to_le32(3), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
/*
* if the two SIDs (roughly equivalent to a UUID for a user or group) are
* the same returns zero, if they do not match returns non-zero.
*/
int compare_sids(const struct smb_sid *ctsid, const struct smb_sid *cwsid)
{
int i;
int num_subauth, num_sat, num_saw;
if (!ctsid || !cwsid)
return 1;
/* compare the revision */
if (ctsid->revision != cwsid->revision) {
if (ctsid->revision > cwsid->revision)
return 1;
else
return -1;
}
/* compare all of the six auth values */
for (i = 0; i < NUM_AUTHS; ++i) {
if (ctsid->authority[i] != cwsid->authority[i]) {
if (ctsid->authority[i] > cwsid->authority[i])
return 1;
else
return -1;
}
}
/* compare all of the subauth values if any */
num_sat = ctsid->num_subauth;
num_saw = cwsid->num_subauth;
num_subauth = num_sat < num_saw ? num_sat : num_saw;
if (num_subauth) {
for (i = 0; i < num_subauth; ++i) {
if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) {
if (le32_to_cpu(ctsid->sub_auth[i]) >
le32_to_cpu(cwsid->sub_auth[i]))
return 1;
else
return -1;
}
}
}
return 0; /* sids compare/match */
}
static void smb_copy_sid(struct smb_sid *dst, const struct smb_sid *src)
{
int i;
dst->revision = src->revision;
dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES);
for (i = 0; i < NUM_AUTHS; ++i)
dst->authority[i] = src->authority[i];
for (i = 0; i < dst->num_subauth; ++i)
dst->sub_auth[i] = src->sub_auth[i];
}
/*
* change posix mode to reflect permissions
* pmode is the existing mode (we only want to overwrite part of this
* bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007
*/
static umode_t access_flags_to_mode(struct smb_fattr *fattr, __le32 ace_flags,
int type)
{
__u32 flags = le32_to_cpu(ace_flags);
umode_t mode = 0;
if (flags & GENERIC_ALL) {
mode = 0777;
ksmbd_debug(SMB, "all perms\n");
return mode;
}
if ((flags & GENERIC_READ) || (flags & FILE_READ_RIGHTS))
mode = 0444;
if ((flags & GENERIC_WRITE) || (flags & FILE_WRITE_RIGHTS)) {
mode |= 0222;
if (S_ISDIR(fattr->cf_mode))
mode |= 0111;
}
if ((flags & GENERIC_EXECUTE) || (flags & FILE_EXEC_RIGHTS))
mode |= 0111;
if (type == ACCESS_DENIED_ACE_TYPE || type == ACCESS_DENIED_OBJECT_ACE_TYPE)
mode = ~mode;
ksmbd_debug(SMB, "access flags 0x%x mode now %04o\n", flags, mode);
return mode;
}
/*
* Generate access flags to reflect permissions mode is the existing mode.
* This function is called for every ACE in the DACL whose SID matches
* with either owner or group or everyone.
*/
static void mode_to_access_flags(umode_t mode, umode_t bits_to_use,
__u32 *pace_flags)
{
/* reset access mask */
*pace_flags = 0x0;
/* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */
mode &= bits_to_use;
/*
* check for R/W/X UGO since we do not know whose flags
* is this but we have cleared all the bits sans RWX for
* either user or group or other as per bits_to_use
*/
if (mode & 0444)
*pace_flags |= SET_FILE_READ_RIGHTS;
if (mode & 0222)
*pace_flags |= FILE_WRITE_RIGHTS;
if (mode & 0111)
*pace_flags |= SET_FILE_EXEC_RIGHTS;
ksmbd_debug(SMB, "mode: %o, access flags now 0x%x\n",
mode, *pace_flags);
}
static __u16 fill_ace_for_sid(struct smb_ace *pntace,
const struct smb_sid *psid, int type, int flags,
umode_t mode, umode_t bits)
{
int i;
__u16 size = 0;
__u32 access_req = 0;
pntace->type = type;
pntace->flags = flags;
mode_to_access_flags(mode, bits, &access_req);
if (!access_req)
access_req = SET_MINIMUM_RIGHTS;
pntace->access_req = cpu_to_le32(access_req);
pntace->sid.revision = psid->revision;
pntace->sid.num_subauth = psid->num_subauth;
for (i = 0; i < NUM_AUTHS; i++)
pntace->sid.authority[i] = psid->authority[i];
for (i = 0; i < psid->num_subauth; i++)
pntace->sid.sub_auth[i] = psid->sub_auth[i];
size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4);
pntace->size = cpu_to_le16(size);
return size;
}
void id_to_sid(unsigned int cid, uint sidtype, struct smb_sid *ssid)
{
switch (sidtype) {
case SIDOWNER:
smb_copy_sid(ssid, &server_conf.domain_sid);
break;
case SIDUNIX_USER:
smb_copy_sid(ssid, &sid_unix_users);
break;
case SIDUNIX_GROUP:
smb_copy_sid(ssid, &sid_unix_groups);
break;
case SIDCREATOR_OWNER:
smb_copy_sid(ssid, &creator_owner);
return;
case SIDCREATOR_GROUP:
smb_copy_sid(ssid, &creator_group);
return;
case SIDNFS_USER:
smb_copy_sid(ssid, &sid_unix_NFS_users);
break;
case SIDNFS_GROUP:
smb_copy_sid(ssid, &sid_unix_NFS_groups);
break;
case SIDNFS_MODE:
smb_copy_sid(ssid, &sid_unix_NFS_mode);
break;
default:
return;
}
/* RID */
ssid->sub_auth[ssid->num_subauth] = cpu_to_le32(cid);
ssid->num_subauth++;
}
static int sid_to_id(struct user_namespace *user_ns,
struct smb_sid *psid, uint sidtype,
struct smb_fattr *fattr)
{
int rc = -EINVAL;
/*
* If we have too many subauthorities, then something is really wrong.
* Just return an error.
*/
if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) {
pr_err("%s: %u subauthorities is too many!\n",
__func__, psid->num_subauth);
return -EIO;
}
if (sidtype == SIDOWNER) {
kuid_t uid;
uid_t id;
id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]);
uid = KUIDT_INIT(id);
uid = from_vfsuid(user_ns, &init_user_ns, VFSUIDT_INIT(uid));
if (uid_valid(uid)) {
fattr->cf_uid = uid;
rc = 0;
}
} else {
kgid_t gid;
gid_t id;
id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]);
gid = KGIDT_INIT(id);
gid = from_vfsgid(user_ns, &init_user_ns, VFSGIDT_INIT(gid));
if (gid_valid(gid)) {
fattr->cf_gid = gid;
rc = 0;
}
}
return rc;
}
void posix_state_to_acl(struct posix_acl_state *state,
struct posix_acl_entry *pace)
{
int i;
pace->e_tag = ACL_USER_OBJ;
pace->e_perm = state->owner.allow;
for (i = 0; i < state->users->n; i++) {
pace++;
pace->e_tag = ACL_USER;
pace->e_uid = state->users->aces[i].uid;
pace->e_perm = state->users->aces[i].perms.allow;
}
pace++;
pace->e_tag = ACL_GROUP_OBJ;
pace->e_perm = state->group.allow;
for (i = 0; i < state->groups->n; i++) {
pace++;
pace->e_tag = ACL_GROUP;
pace->e_gid = state->groups->aces[i].gid;
pace->e_perm = state->groups->aces[i].perms.allow;
}
if (state->users->n || state->groups->n) {
pace++;
pace->e_tag = ACL_MASK;
pace->e_perm = state->mask.allow;
}
pace++;
pace->e_tag = ACL_OTHER;
pace->e_perm = state->other.allow;
}
int init_acl_state(struct posix_acl_state *state, int cnt)
{
int alloc;
memset(state, 0, sizeof(struct posix_acl_state));
/*
* In the worst case, each individual acl could be for a distinct
* named user or group, but we don't know which, so we allocate
* enough space for either:
*/
alloc = sizeof(struct posix_ace_state_array)
+ cnt * sizeof(struct posix_user_ace_state);
state->users = kzalloc(alloc, GFP_KERNEL);
if (!state->users)
return -ENOMEM;
state->groups = kzalloc(alloc, GFP_KERNEL);
if (!state->groups) {
kfree(state->users);
return -ENOMEM;
}
return 0;
}
void free_acl_state(struct posix_acl_state *state)
{
kfree(state->users);
kfree(state->groups);
}
static void parse_dacl(struct user_namespace *user_ns,
struct smb_acl *pdacl, char *end_of_acl,
struct smb_sid *pownersid, struct smb_sid *pgrpsid,
struct smb_fattr *fattr)
{
int i, ret;
int num_aces = 0;
unsigned int acl_size;
char *acl_base;
struct smb_ace **ppace;
struct posix_acl_entry *cf_pace, *cf_pdace;
struct posix_acl_state acl_state, default_acl_state;
umode_t mode = 0, acl_mode;
bool owner_found = false, group_found = false, others_found = false;
if (!pdacl)
return;
/* validate that we do not go past end of acl */
if (end_of_acl < (char *)pdacl + sizeof(struct smb_acl) ||
end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
pr_err("ACL too small to parse DACL\n");
return;
}
ksmbd_debug(SMB, "DACL revision %d size %d num aces %d\n",
le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
le32_to_cpu(pdacl->num_aces));
acl_base = (char *)pdacl;
acl_size = sizeof(struct smb_acl);
num_aces = le32_to_cpu(pdacl->num_aces);
if (num_aces <= 0)
return;
if (num_aces > ULONG_MAX / sizeof(struct smb_ace *))
return;
ppace = kmalloc_array(num_aces, sizeof(struct smb_ace *), GFP_KERNEL);
if (!ppace)
return;
ret = init_acl_state(&acl_state, num_aces);
if (ret)
return;
ret = init_acl_state(&default_acl_state, num_aces);
if (ret) {
free_acl_state(&acl_state);
return;
}
/*
* reset rwx permissions for user/group/other.
* Also, if num_aces is 0 i.e. DACL has no ACEs,
* user/group/other have no permissions
*/
for (i = 0; i < num_aces; ++i) {
if (end_of_acl - acl_base < acl_size)
break;
ppace[i] = (struct smb_ace *)(acl_base + acl_size);
acl_base = (char *)ppace[i];
acl_size = offsetof(struct smb_ace, sid) +
offsetof(struct smb_sid, sub_auth);
if (end_of_acl - acl_base < acl_size ||
ppace[i]->sid.num_subauth > SID_MAX_SUB_AUTHORITIES ||
(end_of_acl - acl_base <
acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth) ||
(le16_to_cpu(ppace[i]->size) <
acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth))
break;
acl_size = le16_to_cpu(ppace[i]->size);
ppace[i]->access_req =
smb_map_generic_desired_access(ppace[i]->access_req);
if (!(compare_sids(&ppace[i]->sid, &sid_unix_NFS_mode))) {
fattr->cf_mode =
le32_to_cpu(ppace[i]->sid.sub_auth[2]);
break;
} else if (!compare_sids(&ppace[i]->sid, pownersid)) {
acl_mode = access_flags_to_mode(fattr,
ppace[i]->access_req,
ppace[i]->type);
acl_mode &= 0700;
if (!owner_found) {
mode &= ~(0700);
mode |= acl_mode;
}
owner_found = true;
} else if (!compare_sids(&ppace[i]->sid, pgrpsid) ||
ppace[i]->sid.sub_auth[ppace[i]->sid.num_subauth - 1] ==
DOMAIN_USER_RID_LE) {
acl_mode = access_flags_to_mode(fattr,
ppace[i]->access_req,
ppace[i]->type);
acl_mode &= 0070;
if (!group_found) {
mode &= ~(0070);
mode |= acl_mode;
}
group_found = true;
} else if (!compare_sids(&ppace[i]->sid, &sid_everyone)) {
acl_mode = access_flags_to_mode(fattr,
ppace[i]->access_req,
ppace[i]->type);
acl_mode &= 0007;
if (!others_found) {
mode &= ~(0007);
mode |= acl_mode;
}
others_found = true;
} else if (!compare_sids(&ppace[i]->sid, &creator_owner)) {
continue;
} else if (!compare_sids(&ppace[i]->sid, &creator_group)) {
continue;
} else if (!compare_sids(&ppace[i]->sid, &sid_authusers)) {
continue;
} else {
struct smb_fattr temp_fattr;
acl_mode = access_flags_to_mode(fattr, ppace[i]->access_req,
ppace[i]->type);
temp_fattr.cf_uid = INVALID_UID;
ret = sid_to_id(user_ns, &ppace[i]->sid, SIDOWNER, &temp_fattr);
if (ret || uid_eq(temp_fattr.cf_uid, INVALID_UID)) {
pr_err("%s: Error %d mapping Owner SID to uid\n",
__func__, ret);
continue;
}
acl_state.owner.allow = ((acl_mode & 0700) >> 6) | 0004;
acl_state.users->aces[acl_state.users->n].uid =
temp_fattr.cf_uid;
acl_state.users->aces[acl_state.users->n++].perms.allow =
((acl_mode & 0700) >> 6) | 0004;
default_acl_state.owner.allow = ((acl_mode & 0700) >> 6) | 0004;
default_acl_state.users->aces[default_acl_state.users->n].uid =
temp_fattr.cf_uid;
default_acl_state.users->aces[default_acl_state.users->n++].perms.allow =
((acl_mode & 0700) >> 6) | 0004;
}
}
kfree(ppace);
if (owner_found) {
/* The owner must be set to at least read-only. */
acl_state.owner.allow = ((mode & 0700) >> 6) | 0004;
acl_state.users->aces[acl_state.users->n].uid = fattr->cf_uid;
acl_state.users->aces[acl_state.users->n++].perms.allow =
((mode & 0700) >> 6) | 0004;
default_acl_state.owner.allow = ((mode & 0700) >> 6) | 0004;
default_acl_state.users->aces[default_acl_state.users->n].uid =
fattr->cf_uid;
default_acl_state.users->aces[default_acl_state.users->n++].perms.allow =
((mode & 0700) >> 6) | 0004;
}
if (group_found) {
acl_state.group.allow = (mode & 0070) >> 3;
acl_state.groups->aces[acl_state.groups->n].gid =
fattr->cf_gid;
acl_state.groups->aces[acl_state.groups->n++].perms.allow =
(mode & 0070) >> 3;
default_acl_state.group.allow = (mode & 0070) >> 3;
default_acl_state.groups->aces[default_acl_state.groups->n].gid =
fattr->cf_gid;
default_acl_state.groups->aces[default_acl_state.groups->n++].perms.allow =
(mode & 0070) >> 3;
}
if (others_found) {
fattr->cf_mode &= ~(0007);
fattr->cf_mode |= mode & 0007;
acl_state.other.allow = mode & 0007;
default_acl_state.other.allow = mode & 0007;
}
if (acl_state.users->n || acl_state.groups->n) {
acl_state.mask.allow = 0x07;
if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
fattr->cf_acls =
posix_acl_alloc(acl_state.users->n +
acl_state.groups->n + 4, GFP_KERNEL);
if (fattr->cf_acls) {
cf_pace = fattr->cf_acls->a_entries;
posix_state_to_acl(&acl_state, cf_pace);
}
}
}
if (default_acl_state.users->n || default_acl_state.groups->n) {
default_acl_state.mask.allow = 0x07;
if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
fattr->cf_dacls =
posix_acl_alloc(default_acl_state.users->n +
default_acl_state.groups->n + 4, GFP_KERNEL);
if (fattr->cf_dacls) {
cf_pdace = fattr->cf_dacls->a_entries;
posix_state_to_acl(&default_acl_state, cf_pdace);
}
}
}
free_acl_state(&acl_state);
free_acl_state(&default_acl_state);
}
static void set_posix_acl_entries_dacl(struct user_namespace *user_ns,
struct smb_ace *pndace,
struct smb_fattr *fattr, u32 *num_aces,
u16 *size, u32 nt_aces_num)
{
struct posix_acl_entry *pace;
struct smb_sid *sid;
struct smb_ace *ntace;
int i, j;
if (!fattr->cf_acls)
goto posix_default_acl;
pace = fattr->cf_acls->a_entries;
for (i = 0; i < fattr->cf_acls->a_count; i++, pace++) {
int flags = 0;
sid = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
if (!sid)
break;
if (pace->e_tag == ACL_USER) {
uid_t uid;
unsigned int sid_type = SIDOWNER;
uid = posix_acl_uid_translate(user_ns, pace);
if (!uid)
sid_type = SIDUNIX_USER;
id_to_sid(uid, sid_type, sid);
} else if (pace->e_tag == ACL_GROUP) {
gid_t gid;
gid = posix_acl_gid_translate(user_ns, pace);
id_to_sid(gid, SIDUNIX_GROUP, sid);
} else if (pace->e_tag == ACL_OTHER && !nt_aces_num) {
smb_copy_sid(sid, &sid_everyone);
} else {
kfree(sid);
continue;
}
ntace = pndace;
for (j = 0; j < nt_aces_num; j++) {
if (ntace->sid.sub_auth[ntace->sid.num_subauth - 1] ==
sid->sub_auth[sid->num_subauth - 1])
goto pass_same_sid;
ntace = (struct smb_ace *)((char *)ntace +
le16_to_cpu(ntace->size));
}
if (S_ISDIR(fattr->cf_mode) && pace->e_tag == ACL_OTHER)
flags = 0x03;
ntace = (struct smb_ace *)((char *)pndace + *size);
*size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, flags,
pace->e_perm, 0777);
(*num_aces)++;
if (pace->e_tag == ACL_USER)
ntace->access_req |=
FILE_DELETE_LE | FILE_DELETE_CHILD_LE;
if (S_ISDIR(fattr->cf_mode) &&
(pace->e_tag == ACL_USER || pace->e_tag == ACL_GROUP)) {
ntace = (struct smb_ace *)((char *)pndace + *size);
*size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED,
0x03, pace->e_perm, 0777);
(*num_aces)++;
if (pace->e_tag == ACL_USER)
ntace->access_req |=
FILE_DELETE_LE | FILE_DELETE_CHILD_LE;
}
pass_same_sid:
kfree(sid);
}
if (nt_aces_num)
return;
posix_default_acl:
if (!fattr->cf_dacls)
return;
pace = fattr->cf_dacls->a_entries;
for (i = 0; i < fattr->cf_dacls->a_count; i++, pace++) {
sid = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
if (!sid)
break;
if (pace->e_tag == ACL_USER) {
uid_t uid;
uid = posix_acl_uid_translate(user_ns, pace);
id_to_sid(uid, SIDCREATOR_OWNER, sid);
} else if (pace->e_tag == ACL_GROUP) {
gid_t gid;
gid = posix_acl_gid_translate(user_ns, pace);
id_to_sid(gid, SIDCREATOR_GROUP, sid);
} else {
kfree(sid);
continue;
}
ntace = (struct smb_ace *)((char *)pndace + *size);
*size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, 0x0b,
pace->e_perm, 0777);
(*num_aces)++;
if (pace->e_tag == ACL_USER)
ntace->access_req |=
FILE_DELETE_LE | FILE_DELETE_CHILD_LE;
kfree(sid);
}
}
static void set_ntacl_dacl(struct user_namespace *user_ns,
struct smb_acl *pndacl,
struct smb_acl *nt_dacl,
unsigned int aces_size,
const struct smb_sid *pownersid,
const struct smb_sid *pgrpsid,
struct smb_fattr *fattr)
{
struct smb_ace *ntace, *pndace;
int nt_num_aces = le32_to_cpu(nt_dacl->num_aces), num_aces = 0;
unsigned short size = 0;
int i;
pndace = (struct smb_ace *)((char *)pndacl + sizeof(struct smb_acl));
if (nt_num_aces) {
ntace = (struct smb_ace *)((char *)nt_dacl + sizeof(struct smb_acl));
for (i = 0; i < nt_num_aces; i++) {
unsigned short nt_ace_size;
if (offsetof(struct smb_ace, access_req) > aces_size)
break;
nt_ace_size = le16_to_cpu(ntace->size);
if (nt_ace_size > aces_size)
break;
memcpy((char *)pndace + size, ntace, nt_ace_size);
size += nt_ace_size;
aces_size -= nt_ace_size;
ntace = (struct smb_ace *)((char *)ntace + nt_ace_size);
num_aces++;
}
}
set_posix_acl_entries_dacl(user_ns, pndace, fattr,
&num_aces, &size, nt_num_aces);
pndacl->num_aces = cpu_to_le32(num_aces);
pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size);
}
static void set_mode_dacl(struct user_namespace *user_ns,
struct smb_acl *pndacl, struct smb_fattr *fattr)
{
struct smb_ace *pace, *pndace;
u32 num_aces = 0;
u16 size = 0, ace_size = 0;
uid_t uid;
const struct smb_sid *sid;
pace = pndace = (struct smb_ace *)((char *)pndacl + sizeof(struct smb_acl));
if (fattr->cf_acls) {
set_posix_acl_entries_dacl(user_ns, pndace, fattr,
&num_aces, &size, num_aces);
goto out;
}
/* owner RID */
uid = from_kuid(&init_user_ns, fattr->cf_uid);
if (uid)
sid = &server_conf.domain_sid;
else
sid = &sid_unix_users;
ace_size = fill_ace_for_sid(pace, sid, ACCESS_ALLOWED, 0,
fattr->cf_mode, 0700);
pace->sid.sub_auth[pace->sid.num_subauth++] = cpu_to_le32(uid);
pace->size = cpu_to_le16(ace_size + 4);
size += le16_to_cpu(pace->size);
pace = (struct smb_ace *)((char *)pndace + size);
/* Group RID */
ace_size = fill_ace_for_sid(pace, &sid_unix_groups,
ACCESS_ALLOWED, 0, fattr->cf_mode, 0070);
pace->sid.sub_auth[pace->sid.num_subauth++] =
cpu_to_le32(from_kgid(&init_user_ns, fattr->cf_gid));
pace->size = cpu_to_le16(ace_size + 4);
size += le16_to_cpu(pace->size);
pace = (struct smb_ace *)((char *)pndace + size);
num_aces = 3;
if (S_ISDIR(fattr->cf_mode)) {
pace = (struct smb_ace *)((char *)pndace + size);
/* creator owner */
size += fill_ace_for_sid(pace, &creator_owner, ACCESS_ALLOWED,
0x0b, fattr->cf_mode, 0700);
pace = (struct smb_ace *)((char *)pndace + size);
/* creator group */
size += fill_ace_for_sid(pace, &creator_group, ACCESS_ALLOWED,
0x0b, fattr->cf_mode, 0070);
pace = (struct smb_ace *)((char *)pndace + size);
num_aces = 5;
}
/* other */
size += fill_ace_for_sid(pace, &sid_everyone, ACCESS_ALLOWED, 0,
fattr->cf_mode, 0007);
out:
pndacl->num_aces = cpu_to_le32(num_aces);
pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size);
}
static int parse_sid(struct smb_sid *psid, char *end_of_acl)
{
/*
* validate that we do not go past end of ACL - sid must be at least 8
* bytes long (assuming no sub-auths - e.g. the null SID
*/
if (end_of_acl < (char *)psid + 8) {
pr_err("ACL too small to parse SID %p\n", psid);
return -EINVAL;
}
return 0;
}
/* Convert CIFS ACL to POSIX form */
int parse_sec_desc(struct user_namespace *user_ns, struct smb_ntsd *pntsd,
int acl_len, struct smb_fattr *fattr)
{
int rc = 0;
struct smb_sid *owner_sid_ptr, *group_sid_ptr;
struct smb_acl *dacl_ptr; /* no need for SACL ptr */
char *end_of_acl = ((char *)pntsd) + acl_len;
__u32 dacloffset;
int pntsd_type;
if (!pntsd)
return -EIO;
if (acl_len < sizeof(struct smb_ntsd))
return -EINVAL;
owner_sid_ptr = (struct smb_sid *)((char *)pntsd +
le32_to_cpu(pntsd->osidoffset));
group_sid_ptr = (struct smb_sid *)((char *)pntsd +
le32_to_cpu(pntsd->gsidoffset));
dacloffset = le32_to_cpu(pntsd->dacloffset);
dacl_ptr = (struct smb_acl *)((char *)pntsd + dacloffset);
ksmbd_debug(SMB,
"revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n",
pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),
le32_to_cpu(pntsd->gsidoffset),
le32_to_cpu(pntsd->sacloffset), dacloffset);
pntsd_type = le16_to_cpu(pntsd->type);
if (!(pntsd_type & DACL_PRESENT)) {
ksmbd_debug(SMB, "DACL_PRESENT in DACL type is not set\n");
return rc;
}
pntsd->type = cpu_to_le16(DACL_PRESENT);
if (pntsd->osidoffset) {
rc = parse_sid(owner_sid_ptr, end_of_acl);
if (rc) {
pr_err("%s: Error %d parsing Owner SID\n", __func__, rc);
return rc;
}
rc = sid_to_id(user_ns, owner_sid_ptr, SIDOWNER, fattr);
if (rc) {
pr_err("%s: Error %d mapping Owner SID to uid\n",
__func__, rc);
owner_sid_ptr = NULL;
}
}
if (pntsd->gsidoffset) {
rc = parse_sid(group_sid_ptr, end_of_acl);
if (rc) {
pr_err("%s: Error %d mapping Owner SID to gid\n",
__func__, rc);
return rc;
}
rc = sid_to_id(user_ns, group_sid_ptr, SIDUNIX_GROUP, fattr);
if (rc) {
pr_err("%s: Error %d mapping Group SID to gid\n",
__func__, rc);
group_sid_ptr = NULL;
}
}
if ((pntsd_type & (DACL_AUTO_INHERITED | DACL_AUTO_INHERIT_REQ)) ==
(DACL_AUTO_INHERITED | DACL_AUTO_INHERIT_REQ))
pntsd->type |= cpu_to_le16(DACL_AUTO_INHERITED);
if (pntsd_type & DACL_PROTECTED)
pntsd->type |= cpu_to_le16(DACL_PROTECTED);
if (dacloffset) {
parse_dacl(user_ns, dacl_ptr, end_of_acl,
owner_sid_ptr, group_sid_ptr, fattr);
}
return 0;
}
/* Convert permission bits from mode to equivalent CIFS ACL */
int build_sec_desc(struct user_namespace *user_ns,
struct smb_ntsd *pntsd, struct smb_ntsd *ppntsd,
int ppntsd_size, int addition_info, __u32 *secdesclen,
struct smb_fattr *fattr)
{
int rc = 0;
__u32 offset;
struct smb_sid *owner_sid_ptr, *group_sid_ptr;
struct smb_sid *nowner_sid_ptr, *ngroup_sid_ptr;
struct smb_acl *dacl_ptr = NULL; /* no need for SACL ptr */
uid_t uid;
gid_t gid;
unsigned int sid_type = SIDOWNER;
nowner_sid_ptr = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
if (!nowner_sid_ptr)
return -ENOMEM;
uid = from_kuid(&init_user_ns, fattr->cf_uid);
if (!uid)
sid_type = SIDUNIX_USER;
id_to_sid(uid, sid_type, nowner_sid_ptr);
ngroup_sid_ptr = kmalloc(sizeof(struct smb_sid), GFP_KERNEL);
if (!ngroup_sid_ptr) {
kfree(nowner_sid_ptr);
return -ENOMEM;
}
gid = from_kgid(&init_user_ns, fattr->cf_gid);
id_to_sid(gid, SIDUNIX_GROUP, ngroup_sid_ptr);
offset = sizeof(struct smb_ntsd);
pntsd->sacloffset = 0;
pntsd->revision = cpu_to_le16(1);
pntsd->type = cpu_to_le16(SELF_RELATIVE);
if (ppntsd)
pntsd->type |= ppntsd->type;
if (addition_info & OWNER_SECINFO) {
pntsd->osidoffset = cpu_to_le32(offset);
owner_sid_ptr = (struct smb_sid *)((char *)pntsd + offset);
smb_copy_sid(owner_sid_ptr, nowner_sid_ptr);
offset += 1 + 1 + 6 + (nowner_sid_ptr->num_subauth * 4);
}
if (addition_info & GROUP_SECINFO) {
pntsd->gsidoffset = cpu_to_le32(offset);
group_sid_ptr = (struct smb_sid *)((char *)pntsd + offset);
smb_copy_sid(group_sid_ptr, ngroup_sid_ptr);
offset += 1 + 1 + 6 + (ngroup_sid_ptr->num_subauth * 4);
}
if (addition_info & DACL_SECINFO) {
pntsd->type |= cpu_to_le16(DACL_PRESENT);
dacl_ptr = (struct smb_acl *)((char *)pntsd + offset);
dacl_ptr->revision = cpu_to_le16(2);
dacl_ptr->size = cpu_to_le16(sizeof(struct smb_acl));
dacl_ptr->num_aces = 0;
if (!ppntsd) {
set_mode_dacl(user_ns, dacl_ptr, fattr);
} else {
struct smb_acl *ppdacl_ptr;
unsigned int dacl_offset = le32_to_cpu(ppntsd->dacloffset);
int ppdacl_size, ntacl_size = ppntsd_size - dacl_offset;
if (!dacl_offset ||
(dacl_offset + sizeof(struct smb_acl) > ppntsd_size))
goto out;
ppdacl_ptr = (struct smb_acl *)((char *)ppntsd + dacl_offset);
ppdacl_size = le16_to_cpu(ppdacl_ptr->size);
if (ppdacl_size > ntacl_size ||
ppdacl_size < sizeof(struct smb_acl))
goto out;
set_ntacl_dacl(user_ns, dacl_ptr, ppdacl_ptr,
ntacl_size - sizeof(struct smb_acl),
nowner_sid_ptr, ngroup_sid_ptr,
fattr);
}
pntsd->dacloffset = cpu_to_le32(offset);
offset += le16_to_cpu(dacl_ptr->size);
}
out:
kfree(nowner_sid_ptr);
kfree(ngroup_sid_ptr);
*secdesclen = offset;
return rc;
}
static void smb_set_ace(struct smb_ace *ace, const struct smb_sid *sid, u8 type,
u8 flags, __le32 access_req)
{
ace->type = type;
ace->flags = flags;
ace->access_req = access_req;
smb_copy_sid(&ace->sid, sid);
ace->size = cpu_to_le16(1 + 1 + 2 + 4 + 1 + 1 + 6 + (sid->num_subauth * 4));
}
int smb_inherit_dacl(struct ksmbd_conn *conn,
const struct path *path,
unsigned int uid, unsigned int gid)
{
const struct smb_sid *psid, *creator = NULL;
struct smb_ace *parent_aces, *aces;