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![Christian Brauner](/assets/img/avatar_default.png)
In a few places the vfs needs to interact with bare k{g,u}ids directly instead of struct inode. These are just a few. In previous patches we introduced low-level mapping helpers that are able to support filesystems mounted an idmapping. This patch simply converts the places to use these new helpers. Link: https://lore.kernel.org/r/20211123114227.3124056-7-brauner@kernel.org (v1) Link: https://lore.kernel.org/r/20211130121032.3753852-7-brauner@kernel.org (v2) Link: https://lore.kernel.org/r/20211203111707.3901969-7-brauner@kernel.org Cc: Seth Forshee <sforshee@digitalocean.com> Cc: Amir Goldstein <amir73il@gmail.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> CC: linux-fsdevel@vger.kernel.org Reviewed-by: Seth Forshee <sforshee@digitalocean.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
1387 lines
38 KiB
C
1387 lines
38 KiB
C
// SPDX-License-Identifier: LGPL-2.1+
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/*
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* Copyright (C) International Business Machines Corp., 2007,2008
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Copyright (C) 2020 Samsung Electronics Co., Ltd.
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* Author(s): Namjae Jeon <linkinjeon@kernel.org>
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*/
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/mnt_idmapping.h>
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#include "smbacl.h"
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#include "smb_common.h"
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#include "server.h"
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#include "misc.h"
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#include "mgmt/share_config.h"
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static const struct smb_sid domain = {1, 4, {0, 0, 0, 0, 0, 5},
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{cpu_to_le32(21), cpu_to_le32(1), cpu_to_le32(2), cpu_to_le32(3),
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
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/* security id for everyone/world system group */
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static const struct smb_sid creator_owner = {
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1, 1, {0, 0, 0, 0, 0, 3}, {0} };
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/* security id for everyone/world system group */
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static const struct smb_sid creator_group = {
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1, 1, {0, 0, 0, 0, 0, 3}, {cpu_to_le32(1)} };
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/* security id for everyone/world system group */
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static const struct smb_sid sid_everyone = {
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1, 1, {0, 0, 0, 0, 0, 1}, {0} };
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/* security id for Authenticated Users system group */
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static const struct smb_sid sid_authusers = {
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1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} };
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/* S-1-22-1 Unmapped Unix users */
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static const struct smb_sid sid_unix_users = {1, 1, {0, 0, 0, 0, 0, 22},
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{cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
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/* S-1-22-2 Unmapped Unix groups */
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static const struct smb_sid sid_unix_groups = { 1, 1, {0, 0, 0, 0, 0, 22},
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{cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
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/*
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* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx
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*/
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/* S-1-5-88 MS NFS and Apple style UID/GID/mode */
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/* S-1-5-88-1 Unix uid */
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static const struct smb_sid sid_unix_NFS_users = { 1, 2, {0, 0, 0, 0, 0, 5},
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{cpu_to_le32(88),
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cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
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/* S-1-5-88-2 Unix gid */
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static const struct smb_sid sid_unix_NFS_groups = { 1, 2, {0, 0, 0, 0, 0, 5},
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{cpu_to_le32(88),
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cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
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/* S-1-5-88-3 Unix mode */
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static const struct smb_sid sid_unix_NFS_mode = { 1, 2, {0, 0, 0, 0, 0, 5},
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{cpu_to_le32(88),
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cpu_to_le32(3), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
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/*
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* if the two SIDs (roughly equivalent to a UUID for a user or group) are
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* the same returns zero, if they do not match returns non-zero.
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*/
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int compare_sids(const struct smb_sid *ctsid, const struct smb_sid *cwsid)
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{
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int i;
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int num_subauth, num_sat, num_saw;
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if (!ctsid || !cwsid)
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return 1;
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/* compare the revision */
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if (ctsid->revision != cwsid->revision) {
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if (ctsid->revision > cwsid->revision)
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return 1;
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else
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return -1;
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}
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/* compare all of the six auth values */
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for (i = 0; i < NUM_AUTHS; ++i) {
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if (ctsid->authority[i] != cwsid->authority[i]) {
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if (ctsid->authority[i] > cwsid->authority[i])
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return 1;
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else
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return -1;
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}
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}
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/* compare all of the subauth values if any */
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num_sat = ctsid->num_subauth;
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num_saw = cwsid->num_subauth;
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num_subauth = num_sat < num_saw ? num_sat : num_saw;
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if (num_subauth) {
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for (i = 0; i < num_subauth; ++i) {
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if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) {
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if (le32_to_cpu(ctsid->sub_auth[i]) >
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le32_to_cpu(cwsid->sub_auth[i]))
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return 1;
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else
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return -1;
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}
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}
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}
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return 0; /* sids compare/match */
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}
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static void smb_copy_sid(struct smb_sid *dst, const struct smb_sid *src)
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{
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int i;
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dst->revision = src->revision;
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dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES);
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for (i = 0; i < NUM_AUTHS; ++i)
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dst->authority[i] = src->authority[i];
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for (i = 0; i < dst->num_subauth; ++i)
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dst->sub_auth[i] = src->sub_auth[i];
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}
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/*
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* change posix mode to reflect permissions
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* pmode is the existing mode (we only want to overwrite part of this
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* bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007
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*/
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static umode_t access_flags_to_mode(struct smb_fattr *fattr, __le32 ace_flags,
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int type)
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{
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__u32 flags = le32_to_cpu(ace_flags);
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umode_t mode = 0;
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if (flags & GENERIC_ALL) {
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mode = 0777;
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ksmbd_debug(SMB, "all perms\n");
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return mode;
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}
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if ((flags & GENERIC_READ) || (flags & FILE_READ_RIGHTS))
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mode = 0444;
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if ((flags & GENERIC_WRITE) || (flags & FILE_WRITE_RIGHTS)) {
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mode |= 0222;
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if (S_ISDIR(fattr->cf_mode))
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mode |= 0111;
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}
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if ((flags & GENERIC_EXECUTE) || (flags & FILE_EXEC_RIGHTS))
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mode |= 0111;
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if (type == ACCESS_DENIED_ACE_TYPE || type == ACCESS_DENIED_OBJECT_ACE_TYPE)
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mode = ~mode;
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ksmbd_debug(SMB, "access flags 0x%x mode now %04o\n", flags, mode);
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return mode;
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}
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/*
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* Generate access flags to reflect permissions mode is the existing mode.
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* This function is called for every ACE in the DACL whose SID matches
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* with either owner or group or everyone.
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*/
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static void mode_to_access_flags(umode_t mode, umode_t bits_to_use,
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__u32 *pace_flags)
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{
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/* reset access mask */
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*pace_flags = 0x0;
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/* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */
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mode &= bits_to_use;
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/*
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* check for R/W/X UGO since we do not know whose flags
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* is this but we have cleared all the bits sans RWX for
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* either user or group or other as per bits_to_use
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*/
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if (mode & 0444)
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*pace_flags |= SET_FILE_READ_RIGHTS;
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if (mode & 0222)
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*pace_flags |= FILE_WRITE_RIGHTS;
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if (mode & 0111)
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*pace_flags |= SET_FILE_EXEC_RIGHTS;
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ksmbd_debug(SMB, "mode: %o, access flags now 0x%x\n",
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mode, *pace_flags);
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}
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static __u16 fill_ace_for_sid(struct smb_ace *pntace,
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const struct smb_sid *psid, int type, int flags,
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umode_t mode, umode_t bits)
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{
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int i;
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__u16 size = 0;
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__u32 access_req = 0;
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pntace->type = type;
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pntace->flags = flags;
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mode_to_access_flags(mode, bits, &access_req);
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if (!access_req)
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access_req = SET_MINIMUM_RIGHTS;
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pntace->access_req = cpu_to_le32(access_req);
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pntace->sid.revision = psid->revision;
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pntace->sid.num_subauth = psid->num_subauth;
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for (i = 0; i < NUM_AUTHS; i++)
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pntace->sid.authority[i] = psid->authority[i];
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for (i = 0; i < psid->num_subauth; i++)
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pntace->sid.sub_auth[i] = psid->sub_auth[i];
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size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4);
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pntace->size = cpu_to_le16(size);
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return size;
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}
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void id_to_sid(unsigned int cid, uint sidtype, struct smb_sid *ssid)
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{
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switch (sidtype) {
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case SIDOWNER:
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smb_copy_sid(ssid, &server_conf.domain_sid);
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break;
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case SIDUNIX_USER:
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smb_copy_sid(ssid, &sid_unix_users);
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break;
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case SIDUNIX_GROUP:
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smb_copy_sid(ssid, &sid_unix_groups);
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break;
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case SIDCREATOR_OWNER:
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smb_copy_sid(ssid, &creator_owner);
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return;
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case SIDCREATOR_GROUP:
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smb_copy_sid(ssid, &creator_group);
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return;
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case SIDNFS_USER:
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smb_copy_sid(ssid, &sid_unix_NFS_users);
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break;
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case SIDNFS_GROUP:
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smb_copy_sid(ssid, &sid_unix_NFS_groups);
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break;
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case SIDNFS_MODE:
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smb_copy_sid(ssid, &sid_unix_NFS_mode);
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break;
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default:
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return;
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}
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/* RID */
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ssid->sub_auth[ssid->num_subauth] = cpu_to_le32(cid);
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ssid->num_subauth++;
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}
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static int sid_to_id(struct user_namespace *user_ns,
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struct smb_sid *psid, uint sidtype,
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struct smb_fattr *fattr)
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{
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int rc = -EINVAL;
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/*
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* If we have too many subauthorities, then something is really wrong.
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* Just return an error.
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*/
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if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) {
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pr_err("%s: %u subauthorities is too many!\n",
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__func__, psid->num_subauth);
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return -EIO;
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}
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if (sidtype == SIDOWNER) {
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kuid_t uid;
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uid_t id;
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id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]);
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uid = mapped_kuid_user(user_ns, &init_user_ns, KUIDT_INIT(id));
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if (uid_valid(uid)) {
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fattr->cf_uid = uid;
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rc = 0;
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}
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} else {
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kgid_t gid;
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gid_t id;
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id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]);
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gid = mapped_kgid_user(user_ns, &init_user_ns, KGIDT_INIT(id));
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if (gid_valid(gid)) {
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fattr->cf_gid = gid;
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rc = 0;
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}
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}
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return rc;
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}
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void posix_state_to_acl(struct posix_acl_state *state,
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struct posix_acl_entry *pace)
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{
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int i;
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pace->e_tag = ACL_USER_OBJ;
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pace->e_perm = state->owner.allow;
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for (i = 0; i < state->users->n; i++) {
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pace++;
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pace->e_tag = ACL_USER;
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pace->e_uid = state->users->aces[i].uid;
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pace->e_perm = state->users->aces[i].perms.allow;
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}
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pace++;
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pace->e_tag = ACL_GROUP_OBJ;
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pace->e_perm = state->group.allow;
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for (i = 0; i < state->groups->n; i++) {
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pace++;
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pace->e_tag = ACL_GROUP;
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pace->e_gid = state->groups->aces[i].gid;
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pace->e_perm = state->groups->aces[i].perms.allow;
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}
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if (state->users->n || state->groups->n) {
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pace++;
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pace->e_tag = ACL_MASK;
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pace->e_perm = state->mask.allow;
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}
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pace++;
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pace->e_tag = ACL_OTHER;
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pace->e_perm = state->other.allow;
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}
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int init_acl_state(struct posix_acl_state *state, int cnt)
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{
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int alloc;
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memset(state, 0, sizeof(struct posix_acl_state));
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/*
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* In the worst case, each individual acl could be for a distinct
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* named user or group, but we don't know which, so we allocate
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* enough space for either:
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*/
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alloc = sizeof(struct posix_ace_state_array)
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+ cnt * sizeof(struct posix_user_ace_state);
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state->users = kzalloc(alloc, GFP_KERNEL);
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if (!state->users)
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return -ENOMEM;
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state->groups = kzalloc(alloc, GFP_KERNEL);
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if (!state->groups) {
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kfree(state->users);
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return -ENOMEM;
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}
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return 0;
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}
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void free_acl_state(struct posix_acl_state *state)
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{
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kfree(state->users);
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kfree(state->groups);
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}
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static void parse_dacl(struct user_namespace *user_ns,
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struct smb_acl *pdacl, char *end_of_acl,
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struct smb_sid *pownersid, struct smb_sid *pgrpsid,
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struct smb_fattr *fattr)
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{
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int i, ret;
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int num_aces = 0;
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unsigned int acl_size;
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char *acl_base;
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struct smb_ace **ppace;
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struct posix_acl_entry *cf_pace, *cf_pdace;
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struct posix_acl_state acl_state, default_acl_state;
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umode_t mode = 0, acl_mode;
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bool owner_found = false, group_found = false, others_found = false;
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if (!pdacl)
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return;
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/* validate that we do not go past end of acl */
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if (end_of_acl < (char *)pdacl + sizeof(struct smb_acl) ||
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end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
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pr_err("ACL too small to parse DACL\n");
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return;
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}
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ksmbd_debug(SMB, "DACL revision %d size %d num aces %d\n",
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le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
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le32_to_cpu(pdacl->num_aces));
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acl_base = (char *)pdacl;
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acl_size = sizeof(struct smb_acl);
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num_aces = le32_to_cpu(pdacl->num_aces);
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if (num_aces <= 0)
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return;
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if (num_aces > ULONG_MAX / sizeof(struct smb_ace *))
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return;
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ppace = kmalloc_array(num_aces, sizeof(struct smb_ace *), GFP_KERNEL);
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if (!ppace)
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return;
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ret = init_acl_state(&acl_state, num_aces);
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if (ret)
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return;
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ret = init_acl_state(&default_acl_state, num_aces);
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if (ret) {
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free_acl_state(&acl_state);
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return;
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}
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/*
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* reset rwx permissions for user/group/other.
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* Also, if num_aces is 0 i.e. DACL has no ACEs,
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* user/group/other have no permissions
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*/
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for (i = 0; i < num_aces; ++i) {
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if (end_of_acl - acl_base < acl_size)
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break;
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ppace[i] = (struct smb_ace *)(acl_base + acl_size);
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acl_base = (char *)ppace[i];
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acl_size = offsetof(struct smb_ace, sid) +
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offsetof(struct smb_sid, sub_auth);
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if (end_of_acl - acl_base < acl_size ||
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ppace[i]->sid.num_subauth > SID_MAX_SUB_AUTHORITIES ||
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(end_of_acl - acl_base <
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acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth) ||
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(le16_to_cpu(ppace[i]->size) <
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acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth))
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break;
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acl_size = le16_to_cpu(ppace[i]->size);
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ppace[i]->access_req =
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smb_map_generic_desired_access(ppace[i]->access_req);
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if (!(compare_sids(&ppace[i]->sid, &sid_unix_NFS_mode))) {
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fattr->cf_mode =
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le32_to_cpu(ppace[i]->sid.sub_auth[2]);
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break;
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} else if (!compare_sids(&ppace[i]->sid, pownersid)) {
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acl_mode = access_flags_to_mode(fattr,
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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,
|
|
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++) {
|
|
memcpy((char *)pndace + size, ntace, le16_to_cpu(ntace->size));
|
|
size += le16_to_cpu(ntace->size);
|
|
ntace = (struct smb_ace *)((char *)ntace + le16_to_cpu(ntace->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 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 if (!ppntsd->dacloffset) {
|
|
goto out;
|
|
} else {
|
|
struct smb_acl *ppdacl_ptr;
|
|
|
|
ppdacl_ptr = (struct smb_acl *)((char *)ppntsd +
|
|
le32_to_cpu(ppntsd->dacloffset));
|
|
set_ntacl_dacl(user_ns, dacl_ptr, ppdacl_ptr,
|
|
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,
|
|
struct path *path,
|
|
unsigned int uid, unsigned int gid)
|
|
{
|
|
const struct smb_sid *psid, *creator = NULL;
|
|
struct smb_ace *parent_aces, *aces;
|
|
struct smb_acl *parent_pdacl;
|
|
struct smb_ntsd *parent_pntsd = NULL;
|
|
struct smb_sid owner_sid, group_sid;
|
|
struct dentry *parent = path->dentry->d_parent;
|
|
struct user_namespace *user_ns = mnt_user_ns(path->mnt);
|
|
int inherited_flags = 0, flags = 0, i, ace_cnt = 0, nt_size = 0;
|
|
int rc = 0, num_aces, dacloffset, pntsd_type, acl_len;
|
|
char *aces_base;
|
|
bool is_dir = S_ISDIR(d_inode(path->dentry)->i_mode);
|
|
|
|
acl_len = ksmbd_vfs_get_sd_xattr(conn, user_ns,
|
|
parent, &parent_pntsd);
|
|
if (acl_len <= 0)
|
|
return -ENOENT;
|
|
dacloffset = le32_to_cpu(parent_pntsd->dacloffset);
|
|
if (!dacloffset) {
|
|
rc = -EINVAL;
|
|
goto free_parent_pntsd;
|
|
}
|
|
|
|
parent_pdacl = (struct smb_acl *)((char *)parent_pntsd + dacloffset);
|
|
num_aces = le32_to_cpu(parent_pdacl->num_aces);
|
|
pntsd_type = le16_to_cpu(parent_pntsd->type);
|
|
|
|
aces_base = kmalloc(sizeof(struct smb_ace) * num_aces * 2, GFP_KERNEL);
|
|
if (!aces_base) {
|
|
rc = -ENOMEM;
|
|
goto free_parent_pntsd;
|
|
}
|
|
|
|
aces = (struct smb_ace *)aces_base;
|
|
parent_aces = (struct smb_ace *)((char *)parent_pdacl +
|
|
sizeof(struct smb_acl));
|
|
|
|
if (pntsd_type & DACL_AUTO_INHERITED)
|
|
inherited_flags = INHERITED_ACE;
|
|
|
|
for (i = 0; i < num_aces; i++) {
|
|
flags = parent_aces->flags;
|
|
if (!smb_inherit_flags(flags, is_dir))
|
|
goto pass;
|
|
if (is_dir) {
|
|
flags &= ~(INHERIT_ONLY_ACE | INHERITED_ACE);
|
|
if (!(flags & CONTAINER_INHERIT_ACE))
|
|
flags |= INHERIT_ONLY_ACE;
|
|
if (flags & NO_PROPAGATE_INHERIT_ACE)
|
|
flags = 0;
|
|
} else {
|
|
flags = 0;
|
|
}
|
|
|
|
if (!compare_sids(&creator_owner, &parent_aces->sid)) {
|
|
creator = &creator_owner;
|
|
id_to_sid(uid, SIDOWNER, &owner_sid);
|
|
psid = &owner_sid;
|
|
} else if (!compare_sids(&creator_group, &parent_aces->sid)) {
|
|
creator = &creator_group;
|
|
id_to_sid(gid, SIDUNIX_GROUP, &group_sid);
|
|
psid = &group_sid;
|
|
} else {
|
|
creator = NULL;
|
|
psid = &parent_aces->sid;
|
|
}
|
|
|
|
if (is_dir && creator && flags & CONTAINER_INHERIT_ACE) {
|
|
smb_set_ace(aces, psid, parent_aces->type, inherited_flags,
|
|
parent_aces->access_req);
|
|
nt_size += le16_to_cpu(aces->size);
|
|
ace_cnt++;
|
|
aces = (struct smb_ace *)((char *)aces + le16_to_cpu(aces->size));
|
|
flags |= INHERIT_ONLY_ACE;
|
|
psid = creator;
|
|
} else if (is_dir && !(parent_aces->flags & NO_PROPAGATE_INHERIT_ACE)) {
|
|
psid = &parent_aces->sid;
|
|
}
|
|
|
|
smb_set_ace(aces, psid, parent_aces->type, flags | inherited_flags,
|
|
parent_aces->access_req);
|
|
nt_size += le16_to_cpu(aces->size);
|
|
aces = (struct smb_ace *)((char *)aces + le16_to_cpu(aces->size));
|
|
ace_cnt++;
|
|
pass:
|
|
parent_aces =
|
|
(struct smb_ace *)((char *)parent_aces + le16_to_cpu(parent_aces->size));
|
|
}
|
|
|
|
if (nt_size > 0) {
|
|
struct smb_ntsd *pntsd;
|
|
struct smb_acl *pdacl;
|
|
struct smb_sid *powner_sid = NULL, *pgroup_sid = NULL;
|
|
int powner_sid_size = 0, pgroup_sid_size = 0, pntsd_size;
|
|
|
|
if (parent_pntsd->osidoffset) {
|
|
powner_sid = (struct smb_sid *)((char *)parent_pntsd +
|
|
le32_to_cpu(parent_pntsd->osidoffset));
|
|
powner_sid_size = 1 + 1 + 6 + (powner_sid->num_subauth * 4);
|
|
}
|
|
if (parent_pntsd->gsidoffset) {
|
|
pgroup_sid = (struct smb_sid *)((char *)parent_pntsd +
|
|
le32_to_cpu(parent_pntsd->gsidoffset));
|
|
pgroup_sid_size = 1 + 1 + 6 + (pgroup_sid->num_subauth * 4);
|
|
}
|
|
|
|
pntsd = kzalloc(sizeof(struct smb_ntsd) + powner_sid_size +
|
|
pgroup_sid_size + sizeof(struct smb_acl) +
|
|
nt_size, GFP_KERNEL);
|
|
if (!pntsd) {
|
|
rc = -ENOMEM;
|
|
goto free_aces_base;
|
|
}
|
|
|
|
pntsd->revision = cpu_to_le16(1);
|
|
pntsd->type = cpu_to_le16(SELF_RELATIVE | DACL_PRESENT);
|
|
if (le16_to_cpu(parent_pntsd->type) & DACL_AUTO_INHERITED)
|
|
pntsd->type |= cpu_to_le16(DACL_AUTO_INHERITED);
|
|
pntsd_size = sizeof(struct smb_ntsd);
|
|
pntsd->osidoffset = parent_pntsd->osidoffset;
|
|
pntsd->gsidoffset = parent_pntsd->gsidoffset;
|
|
pntsd->dacloffset = parent_pntsd->dacloffset;
|
|
|
|
if (pntsd->osidoffset) {
|
|
struct smb_sid *owner_sid = (struct smb_sid *)((char *)pntsd +
|
|
le32_to_cpu(pntsd->osidoffset));
|
|
memcpy(owner_sid, powner_sid, powner_sid_size);
|
|
pntsd_size += powner_sid_size;
|
|
}
|
|
|
|
if (pntsd->gsidoffset) {
|
|
struct smb_sid *group_sid = (struct smb_sid *)((char *)pntsd +
|
|
le32_to_cpu(pntsd->gsidoffset));
|
|
memcpy(group_sid, pgroup_sid, pgroup_sid_size);
|
|
pntsd_size += pgroup_sid_size;
|
|
}
|
|
|
|
if (pntsd->dacloffset) {
|
|
struct smb_ace *pace;
|
|
|
|
pdacl = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset));
|
|
pdacl->revision = cpu_to_le16(2);
|
|
pdacl->size = cpu_to_le16(sizeof(struct smb_acl) + nt_size);
|
|
pdacl->num_aces = cpu_to_le32(ace_cnt);
|
|
pace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl));
|
|
memcpy(pace, aces_base, nt_size);
|
|
pntsd_size += sizeof(struct smb_acl) + nt_size;
|
|
}
|
|
|
|
ksmbd_vfs_set_sd_xattr(conn, user_ns,
|
|
path->dentry, pntsd, pntsd_size);
|
|
kfree(pntsd);
|
|
}
|
|
|
|
free_aces_base:
|
|
kfree(aces_base);
|
|
free_parent_pntsd:
|
|
kfree(parent_pntsd);
|
|
return rc;
|
|
}
|
|
|
|
bool smb_inherit_flags(int flags, bool is_dir)
|
|
{
|
|
if (!is_dir)
|
|
return (flags & OBJECT_INHERIT_ACE) != 0;
|
|
|
|
if (flags & OBJECT_INHERIT_ACE && !(flags & NO_PROPAGATE_INHERIT_ACE))
|
|
return true;
|
|
|
|
if (flags & CONTAINER_INHERIT_ACE)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
int smb_check_perm_dacl(struct ksmbd_conn *conn, struct path *path,
|
|
__le32 *pdaccess, int uid)
|
|
{
|
|
struct user_namespace *user_ns = mnt_user_ns(path->mnt);
|
|
struct smb_ntsd *pntsd = NULL;
|
|
struct smb_acl *pdacl;
|
|
struct posix_acl *posix_acls;
|
|
int rc = 0, acl_size;
|
|
struct smb_sid sid;
|
|
int granted = le32_to_cpu(*pdaccess & ~FILE_MAXIMAL_ACCESS_LE);
|
|
struct smb_ace *ace;
|
|
int i, found = 0;
|
|
unsigned int access_bits = 0;
|
|
struct smb_ace *others_ace = NULL;
|
|
struct posix_acl_entry *pa_entry;
|
|
unsigned int sid_type = SIDOWNER;
|
|
char *end_of_acl;
|
|
|
|
ksmbd_debug(SMB, "check permission using windows acl\n");
|
|
acl_size = ksmbd_vfs_get_sd_xattr(conn, user_ns,
|
|
path->dentry, &pntsd);
|
|
if (acl_size <= 0 || !pntsd || !pntsd->dacloffset) {
|
|
kfree(pntsd);
|
|
return 0;
|
|
}
|
|
|
|
pdacl = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset));
|
|
end_of_acl = ((char *)pntsd) + acl_size;
|
|
if (end_of_acl <= (char *)pdacl) {
|
|
kfree(pntsd);
|
|
return 0;
|
|
}
|
|
|
|
if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size) ||
|
|
le16_to_cpu(pdacl->size) < sizeof(struct smb_acl)) {
|
|
kfree(pntsd);
|
|
return 0;
|
|
}
|
|
|
|
if (!pdacl->num_aces) {
|
|
if (!(le16_to_cpu(pdacl->size) - sizeof(struct smb_acl)) &&
|
|
*pdaccess & ~(FILE_READ_CONTROL_LE | FILE_WRITE_DAC_LE)) {
|
|
rc = -EACCES;
|
|
goto err_out;
|
|
}
|
|
kfree(pntsd);
|
|
return 0;
|
|
}
|
|
|
|
if (*pdaccess & FILE_MAXIMAL_ACCESS_LE) {
|
|
granted = READ_CONTROL | WRITE_DAC | FILE_READ_ATTRIBUTES |
|
|
DELETE;
|
|
|
|
ace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl));
|
|
for (i = 0; i < le32_to_cpu(pdacl->num_aces); i++) {
|
|
granted |= le32_to_cpu(ace->access_req);
|
|
ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size));
|
|
if (end_of_acl < (char *)ace)
|
|
goto err_out;
|
|
}
|
|
|
|
if (!pdacl->num_aces)
|
|
granted = GENERIC_ALL_FLAGS;
|
|
}
|
|
|
|
if (!uid)
|
|
sid_type = SIDUNIX_USER;
|
|
id_to_sid(uid, sid_type, &sid);
|
|
|
|
ace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl));
|
|
for (i = 0; i < le32_to_cpu(pdacl->num_aces); i++) {
|
|
if (!compare_sids(&sid, &ace->sid) ||
|
|
!compare_sids(&sid_unix_NFS_mode, &ace->sid)) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
if (!compare_sids(&sid_everyone, &ace->sid))
|
|
others_ace = ace;
|
|
|
|
ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size));
|
|
if (end_of_acl < (char *)ace)
|
|
goto err_out;
|
|
}
|
|
|
|
if (*pdaccess & FILE_MAXIMAL_ACCESS_LE && found) {
|
|
granted = READ_CONTROL | WRITE_DAC | FILE_READ_ATTRIBUTES |
|
|
DELETE;
|
|
|
|
granted |= le32_to_cpu(ace->access_req);
|
|
|
|
if (!pdacl->num_aces)
|
|
granted = GENERIC_ALL_FLAGS;
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
|
|
posix_acls = get_acl(d_inode(path->dentry), ACL_TYPE_ACCESS);
|
|
if (posix_acls && !found) {
|
|
unsigned int id = -1;
|
|
|
|
pa_entry = posix_acls->a_entries;
|
|
for (i = 0; i < posix_acls->a_count; i++, pa_entry++) {
|
|
if (pa_entry->e_tag == ACL_USER)
|
|
id = posix_acl_uid_translate(user_ns, pa_entry);
|
|
else if (pa_entry->e_tag == ACL_GROUP)
|
|
id = posix_acl_gid_translate(user_ns, pa_entry);
|
|
else
|
|
continue;
|
|
|
|
if (id == uid) {
|
|
mode_to_access_flags(pa_entry->e_perm,
|
|
0777,
|
|
&access_bits);
|
|
if (!access_bits)
|
|
access_bits =
|
|
SET_MINIMUM_RIGHTS;
|
|
goto check_access_bits;
|
|
}
|
|
}
|
|
}
|
|
if (posix_acls)
|
|
posix_acl_release(posix_acls);
|
|
}
|
|
|
|
if (!found) {
|
|
if (others_ace) {
|
|
ace = others_ace;
|
|
} else {
|
|
ksmbd_debug(SMB, "Can't find corresponding sid\n");
|
|
rc = -EACCES;
|
|
goto err_out;
|
|
}
|
|
}
|
|
|
|
switch (ace->type) {
|
|
case ACCESS_ALLOWED_ACE_TYPE:
|
|
access_bits = le32_to_cpu(ace->access_req);
|
|
break;
|
|
case ACCESS_DENIED_ACE_TYPE:
|
|
case ACCESS_DENIED_CALLBACK_ACE_TYPE:
|
|
access_bits = le32_to_cpu(~ace->access_req);
|
|
break;
|
|
}
|
|
|
|
check_access_bits:
|
|
if (granted &
|
|
~(access_bits | FILE_READ_ATTRIBUTES | READ_CONTROL | WRITE_DAC | DELETE)) {
|
|
ksmbd_debug(SMB, "Access denied with winACL, granted : %x, access_req : %x\n",
|
|
granted, le32_to_cpu(ace->access_req));
|
|
rc = -EACCES;
|
|
goto err_out;
|
|
}
|
|
|
|
*pdaccess = cpu_to_le32(granted);
|
|
err_out:
|
|
kfree(pntsd);
|
|
return rc;
|
|
}
|
|
|
|
int set_info_sec(struct ksmbd_conn *conn, struct ksmbd_tree_connect *tcon,
|
|
struct path *path, struct smb_ntsd *pntsd, int ntsd_len,
|
|
bool type_check)
|
|
{
|
|
int rc;
|
|
struct smb_fattr fattr = {{0}};
|
|
struct inode *inode = d_inode(path->dentry);
|
|
struct user_namespace *user_ns = mnt_user_ns(path->mnt);
|
|
struct iattr newattrs;
|
|
|
|
fattr.cf_uid = INVALID_UID;
|
|
fattr.cf_gid = INVALID_GID;
|
|
fattr.cf_mode = inode->i_mode;
|
|
|
|
rc = parse_sec_desc(user_ns, pntsd, ntsd_len, &fattr);
|
|
if (rc)
|
|
goto out;
|
|
|
|
newattrs.ia_valid = ATTR_CTIME;
|
|
if (!uid_eq(fattr.cf_uid, INVALID_UID)) {
|
|
newattrs.ia_valid |= ATTR_UID;
|
|
newattrs.ia_uid = fattr.cf_uid;
|
|
}
|
|
if (!gid_eq(fattr.cf_gid, INVALID_GID)) {
|
|
newattrs.ia_valid |= ATTR_GID;
|
|
newattrs.ia_gid = fattr.cf_gid;
|
|
}
|
|
newattrs.ia_valid |= ATTR_MODE;
|
|
newattrs.ia_mode = (inode->i_mode & ~0777) | (fattr.cf_mode & 0777);
|
|
|
|
ksmbd_vfs_remove_acl_xattrs(user_ns, path->dentry);
|
|
/* Update posix acls */
|
|
if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && fattr.cf_dacls) {
|
|
rc = set_posix_acl(user_ns, inode,
|
|
ACL_TYPE_ACCESS, fattr.cf_acls);
|
|
if (rc < 0)
|
|
ksmbd_debug(SMB,
|
|
"Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
|
|
rc);
|
|
if (S_ISDIR(inode->i_mode) && fattr.cf_dacls) {
|
|
rc = set_posix_acl(user_ns, inode,
|
|
ACL_TYPE_DEFAULT, fattr.cf_dacls);
|
|
if (rc)
|
|
ksmbd_debug(SMB,
|
|
"Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
|
|
rc);
|
|
}
|
|
}
|
|
|
|
inode_lock(inode);
|
|
rc = notify_change(user_ns, path->dentry, &newattrs, NULL);
|
|
inode_unlock(inode);
|
|
if (rc)
|
|
goto out;
|
|
|
|
/* Check it only calling from SD BUFFER context */
|
|
if (type_check && !(le16_to_cpu(pntsd->type) & DACL_PRESENT))
|
|
goto out;
|
|
|
|
if (test_share_config_flag(tcon->share_conf, KSMBD_SHARE_FLAG_ACL_XATTR)) {
|
|
/* Update WinACL in xattr */
|
|
ksmbd_vfs_remove_sd_xattrs(user_ns, path->dentry);
|
|
ksmbd_vfs_set_sd_xattr(conn, user_ns,
|
|
path->dentry, pntsd, ntsd_len);
|
|
}
|
|
|
|
out:
|
|
posix_acl_release(fattr.cf_acls);
|
|
posix_acl_release(fattr.cf_dacls);
|
|
mark_inode_dirty(inode);
|
|
return rc;
|
|
}
|
|
|
|
void ksmbd_init_domain(u32 *sub_auth)
|
|
{
|
|
int i;
|
|
|
|
memcpy(&server_conf.domain_sid, &domain, sizeof(struct smb_sid));
|
|
for (i = 0; i < 3; ++i)
|
|
server_conf.domain_sid.sub_auth[i + 1] = cpu_to_le32(sub_auth[i]);
|
|
}
|