239 строки
6.5 KiB
C
239 строки
6.5 KiB
C
/* 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 user_namespace *user_ns, struct smb_ntsd *pntsd,
|
|
int acl_len, struct smb_fattr *fattr);
|
|
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 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 user_namespace *mnt_userns,
|
|
struct posix_acl_entry *pace)
|
|
{
|
|
kuid_t kuid;
|
|
|
|
/* If this is an idmapped mount, apply the idmapping. */
|
|
kuid = mapped_kuid_fs(mnt_userns, &init_user_ns, pace->e_uid);
|
|
|
|
/* Translate the kuid into a userspace id ksmbd would see. */
|
|
return from_kuid(&init_user_ns, kuid);
|
|
}
|
|
|
|
static inline gid_t posix_acl_gid_translate(struct user_namespace *mnt_userns,
|
|
struct posix_acl_entry *pace)
|
|
{
|
|
kgid_t kgid;
|
|
|
|
/* If this is an idmapped mount, apply the idmapping. */
|
|
kgid = mapped_kgid_fs(mnt_userns, &init_user_ns, pace->e_gid);
|
|
|
|
/* Translate the kgid into a userspace id ksmbd would see. */
|
|
return from_kgid(&init_user_ns, kgid);
|
|
}
|
|
|
|
#endif /* _SMBACL_H */
|