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