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276a3f7cf1
A while ago we introduced a dedicated vfs{g,u}id_t type in commit
1e5267cd08 ("mnt_idmapping: add vfs{g,u}id_t"). We already switched
over a good part of the VFS. Ultimately we will remove all legacy
idmapped mount helpers that operate only on k{g,u}id_t in favor of the
new type safe helpers that operate on vfs{g,u}id_t.
Cc: Seth Forshee (Digital Ocean) <sforshee@kernel.org>
Cc: Steve French <sfrench@samba.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: linux-cifs@vger.kernel.org
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
239 lines
6.5 KiB
C
239 lines
6.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/*
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* Copyright (c) International Business Machines Corp., 2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Modified by Namjae Jeon (linkinjeon@kernel.org)
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*/
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#ifndef _SMBACL_H
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#define _SMBACL_H
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#include <linux/fs.h>
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#include <linux/namei.h>
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#include <linux/posix_acl.h>
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#include <linux/mnt_idmapping.h>
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#include "mgmt/tree_connect.h"
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#define NUM_AUTHS (6) /* number of authority fields */
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#define SID_MAX_SUB_AUTHORITIES (15) /* max number of sub authority fields */
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/*
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* ACE types - see MS-DTYP 2.4.4.1
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*/
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enum {
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ACCESS_ALLOWED,
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ACCESS_DENIED,
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};
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/*
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* Security ID types
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*/
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enum {
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SIDOWNER = 1,
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SIDGROUP,
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SIDCREATOR_OWNER,
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SIDCREATOR_GROUP,
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SIDUNIX_USER,
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SIDUNIX_GROUP,
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SIDNFS_USER,
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SIDNFS_GROUP,
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SIDNFS_MODE,
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};
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/* Revision for ACLs */
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#define SD_REVISION 1
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/* Control flags for Security Descriptor */
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#define OWNER_DEFAULTED 0x0001
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#define GROUP_DEFAULTED 0x0002
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#define DACL_PRESENT 0x0004
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#define DACL_DEFAULTED 0x0008
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#define SACL_PRESENT 0x0010
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#define SACL_DEFAULTED 0x0020
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#define DACL_TRUSTED 0x0040
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#define SERVER_SECURITY 0x0080
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#define DACL_AUTO_INHERIT_REQ 0x0100
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#define SACL_AUTO_INHERIT_REQ 0x0200
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#define DACL_AUTO_INHERITED 0x0400
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#define SACL_AUTO_INHERITED 0x0800
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#define DACL_PROTECTED 0x1000
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#define SACL_PROTECTED 0x2000
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#define RM_CONTROL_VALID 0x4000
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#define SELF_RELATIVE 0x8000
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/* ACE types - see MS-DTYP 2.4.4.1 */
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#define ACCESS_ALLOWED_ACE_TYPE 0x00
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#define ACCESS_DENIED_ACE_TYPE 0x01
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#define SYSTEM_AUDIT_ACE_TYPE 0x02
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#define SYSTEM_ALARM_ACE_TYPE 0x03
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#define ACCESS_ALLOWED_COMPOUND_ACE_TYPE 0x04
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#define ACCESS_ALLOWED_OBJECT_ACE_TYPE 0x05
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#define ACCESS_DENIED_OBJECT_ACE_TYPE 0x06
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#define SYSTEM_AUDIT_OBJECT_ACE_TYPE 0x07
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#define SYSTEM_ALARM_OBJECT_ACE_TYPE 0x08
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#define ACCESS_ALLOWED_CALLBACK_ACE_TYPE 0x09
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#define ACCESS_DENIED_CALLBACK_ACE_TYPE 0x0A
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#define ACCESS_ALLOWED_CALLBACK_OBJECT_ACE_TYPE 0x0B
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#define ACCESS_DENIED_CALLBACK_OBJECT_ACE_TYPE 0x0C
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#define SYSTEM_AUDIT_CALLBACK_ACE_TYPE 0x0D
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#define SYSTEM_ALARM_CALLBACK_ACE_TYPE 0x0E /* Reserved */
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#define SYSTEM_AUDIT_CALLBACK_OBJECT_ACE_TYPE 0x0F
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#define SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE 0x10 /* reserved */
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#define SYSTEM_MANDATORY_LABEL_ACE_TYPE 0x11
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#define SYSTEM_RESOURCE_ATTRIBUTE_ACE_TYPE 0x12
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#define SYSTEM_SCOPED_POLICY_ID_ACE_TYPE 0x13
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/* ACE flags */
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#define OBJECT_INHERIT_ACE 0x01
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#define CONTAINER_INHERIT_ACE 0x02
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#define NO_PROPAGATE_INHERIT_ACE 0x04
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#define INHERIT_ONLY_ACE 0x08
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#define INHERITED_ACE 0x10
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#define SUCCESSFUL_ACCESS_ACE_FLAG 0x40
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#define FAILED_ACCESS_ACE_FLAG 0x80
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/*
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* Maximum size of a string representation of a SID:
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*
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* The fields are unsigned values in decimal. So:
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*
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* u8: max 3 bytes in decimal
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* u32: max 10 bytes in decimal
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*
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* "S-" + 3 bytes for version field + 15 for authority field + NULL terminator
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*
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* For authority field, max is when all 6 values are non-zero and it must be
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* represented in hex. So "-0x" + 12 hex digits.
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*
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* Add 11 bytes for each subauthority field (10 bytes each + 1 for '-')
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*/
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#define SID_STRING_BASE_SIZE (2 + 3 + 15 + 1)
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#define SID_STRING_SUBAUTH_SIZE (11) /* size of a single subauth string */
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#define DOMAIN_USER_RID_LE cpu_to_le32(513)
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struct ksmbd_conn;
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struct smb_ntsd {
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__le16 revision; /* revision level */
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__le16 type;
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__le32 osidoffset;
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__le32 gsidoffset;
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__le32 sacloffset;
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__le32 dacloffset;
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} __packed;
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struct smb_sid {
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__u8 revision; /* revision level */
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__u8 num_subauth;
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__u8 authority[NUM_AUTHS];
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__le32 sub_auth[SID_MAX_SUB_AUTHORITIES]; /* sub_auth[num_subauth] */
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} __packed;
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/* size of a struct cifs_sid, sans sub_auth array */
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#define CIFS_SID_BASE_SIZE (1 + 1 + NUM_AUTHS)
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struct smb_acl {
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__le16 revision; /* revision level */
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__le16 size;
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__le32 num_aces;
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} __packed;
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struct smb_ace {
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__u8 type;
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__u8 flags;
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__le16 size;
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__le32 access_req;
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struct smb_sid sid; /* ie UUID of user or group who gets these perms */
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} __packed;
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struct smb_fattr {
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kuid_t cf_uid;
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kgid_t cf_gid;
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umode_t cf_mode;
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__le32 daccess;
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struct posix_acl *cf_acls;
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struct posix_acl *cf_dacls;
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};
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struct posix_ace_state {
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u32 allow;
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u32 deny;
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};
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struct posix_user_ace_state {
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union {
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kuid_t uid;
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kgid_t gid;
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};
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struct posix_ace_state perms;
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};
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struct posix_ace_state_array {
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int n;
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struct posix_user_ace_state aces[];
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};
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/*
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* while processing the nfsv4 ace, this maintains the partial permissions
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* calculated so far:
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*/
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struct posix_acl_state {
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struct posix_ace_state owner;
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struct posix_ace_state group;
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struct posix_ace_state other;
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struct posix_ace_state everyone;
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struct posix_ace_state mask; /* deny unused in this case */
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struct posix_ace_state_array *users;
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struct posix_ace_state_array *groups;
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};
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int parse_sec_desc(struct user_namespace *user_ns, struct smb_ntsd *pntsd,
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int acl_len, struct smb_fattr *fattr);
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int build_sec_desc(struct user_namespace *user_ns, struct smb_ntsd *pntsd,
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struct smb_ntsd *ppntsd, int ppntsd_size, int addition_info,
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__u32 *secdesclen, struct smb_fattr *fattr);
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int init_acl_state(struct posix_acl_state *state, int cnt);
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void free_acl_state(struct posix_acl_state *state);
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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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int compare_sids(const struct smb_sid *ctsid, const struct smb_sid *cwsid);
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bool smb_inherit_flags(int flags, bool is_dir);
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int smb_inherit_dacl(struct ksmbd_conn *conn, const struct path *path,
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unsigned int uid, unsigned int gid);
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int smb_check_perm_dacl(struct ksmbd_conn *conn, const struct path *path,
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__le32 *pdaccess, int uid);
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int set_info_sec(struct ksmbd_conn *conn, struct ksmbd_tree_connect *tcon,
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const struct path *path, struct smb_ntsd *pntsd, int ntsd_len,
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bool type_check);
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void id_to_sid(unsigned int cid, uint sidtype, struct smb_sid *ssid);
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void ksmbd_init_domain(u32 *sub_auth);
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static inline uid_t posix_acl_uid_translate(struct user_namespace *mnt_userns,
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struct posix_acl_entry *pace)
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{
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vfsuid_t vfsuid;
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/* If this is an idmapped mount, apply the idmapping. */
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vfsuid = make_vfsuid(mnt_userns, &init_user_ns, pace->e_uid);
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/* Translate the kuid into a userspace id ksmbd would see. */
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return from_kuid(&init_user_ns, vfsuid_into_kuid(vfsuid));
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}
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static inline gid_t posix_acl_gid_translate(struct user_namespace *mnt_userns,
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struct posix_acl_entry *pace)
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{
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vfsgid_t vfsgid;
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/* If this is an idmapped mount, apply the idmapping. */
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vfsgid = make_vfsgid(mnt_userns, &init_user_ns, pace->e_gid);
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/* Translate the kgid into a userspace id ksmbd would see. */
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return from_kgid(&init_user_ns, vfsgid_into_kgid(vfsgid));
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}
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#endif /* _SMBACL_H */
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