fs/ksmbd/smbacl.h - linux/kernel/git/torvalds/linux - Git at Google

 /* 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 "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 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, struct path *path,
 		     unsigned int uid, unsigned int gid);
 int smb_check_perm_dacl(struct ksmbd_conn *conn, struct path *path,
 			__le32 *pdaccess, int uid);
 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);
 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 = kuid_into_mnt(mnt_userns, 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 = kgid_into_mnt(mnt_userns, pace->e_gid);

 	/* Translate the kgid into a userspace id ksmbd would see. */
 	return from_kgid(&init_user_ns, kgid);
 }

 #endif /* _SMBACL_H */
	/* 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 "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 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, struct path path,
	unsigned int uid, unsigned int gid);
	int smb_check_perm_dacl(struct ksmbd_conn conn, struct path path,
	__le32 *pdaccess, int uid);
	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);
	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 = kuid_into_mnt(mnt_userns, 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 = kgid_into_mnt(mnt_userns, pace->e_gid);

	/* Translate the kgid into a userspace id ksmbd would see. */
	return from_kgid(&init_user_ns, kgid);
	}

	#endif /* _SMBACL_H */