smbacl.h

  1/* SPDX-License-Identifier: LGPL-2.1+ */
  2/*
  3 *   Copyright (c) International Business Machines  Corp., 2007
  4 *   Author(s): Steve French (sfrench@us.ibm.com)
  5 *   Modified by Namjae Jeon (linkinjeon@kernel.org)
  6 */
  7
  8#ifndef _SMBACL_H
  9#define _SMBACL_H
 10
 11#include "../common/smbacl.h"
 12#include <linux/fs.h>
 13#include <linux/namei.h>
 14#include <linux/posix_acl.h>
 15#include <linux/mnt_idmapping.h>
 16
 17#include "mgmt/tree_connect.h"
 18
 19/* Revision for ACLs */
 20#define SD_REVISION	1
 21
 22/* Control flags for Security Descriptor */
 23#define OWNER_DEFAULTED		0x0001
 24#define GROUP_DEFAULTED		0x0002
 25#define DACL_PRESENT		0x0004
 26#define DACL_DEFAULTED		0x0008
 27#define SACL_PRESENT		0x0010
 28#define SACL_DEFAULTED		0x0020
 29#define DACL_TRUSTED		0x0040
 30#define SERVER_SECURITY		0x0080
 31#define DACL_AUTO_INHERIT_REQ	0x0100
 32#define SACL_AUTO_INHERIT_REQ	0x0200
 33#define DACL_AUTO_INHERITED	0x0400
 34#define SACL_AUTO_INHERITED	0x0800
 35#define DACL_PROTECTED		0x1000
 36#define SACL_PROTECTED		0x2000
 37#define RM_CONTROL_VALID	0x4000
 38#define SELF_RELATIVE		0x8000
 39
 40struct ksmbd_conn;
 41
 42struct smb_fattr {
 43	kuid_t	cf_uid;
 44	kgid_t	cf_gid;
 45	umode_t	cf_mode;
 46	__le32 daccess;
 47	struct posix_acl *cf_acls;
 48	struct posix_acl *cf_dacls;
 49};
 50
 51struct posix_ace_state {
 52	u32 allow;
 53	u32 deny;
 54};
 55
 56struct posix_user_ace_state {
 57	union {
 58		kuid_t uid;
 59		kgid_t gid;
 60	};
 61	struct posix_ace_state perms;
 62};
 63
 64struct posix_ace_state_array {
 65	int n;
 66	struct posix_user_ace_state aces[];
 67};
 68
 69/*
 70 * while processing the nfsv4 ace, this maintains the partial permissions
 71 * calculated so far:
 72 */
 73
 74struct posix_acl_state {
 75	struct posix_ace_state owner;
 76	struct posix_ace_state group;
 77	struct posix_ace_state other;
 78	struct posix_ace_state everyone;
 79	struct posix_ace_state mask; /* deny unused in this case */
 80	struct posix_ace_state_array *users;
 81	struct posix_ace_state_array *groups;
 82};
 83
 84int parse_sec_desc(struct mnt_idmap *idmap, struct smb_ntsd *pntsd,
 85		   int acl_len, struct smb_fattr *fattr);
 86int build_sec_desc(struct mnt_idmap *idmap, struct smb_ntsd *pntsd,
 87		   struct smb_ntsd *ppntsd, int ppntsd_size, int addition_info,
 88		   __u32 *secdesclen, struct smb_fattr *fattr);
 89int init_acl_state(struct posix_acl_state *state, u16 cnt);
 90void free_acl_state(struct posix_acl_state *state);
 91void posix_state_to_acl(struct posix_acl_state *state,
 92			struct posix_acl_entry *pace);
 93int compare_sids(const struct smb_sid *ctsid, const struct smb_sid *cwsid);
 94bool smb_inherit_flags(int flags, bool is_dir);
 95int smb_inherit_dacl(struct ksmbd_conn *conn, const struct path *path,
 96		     unsigned int uid, unsigned int gid);
 97int smb_check_perm_dacl(struct ksmbd_conn *conn, const struct path *path,
 98			__le32 *pdaccess, int uid);
 99int set_info_sec(struct ksmbd_conn *conn, struct ksmbd_tree_connect *tcon,
100		 const struct path *path, struct smb_ntsd *pntsd, int ntsd_len,
101		 bool type_check, bool get_write);
102void id_to_sid(unsigned int cid, uint sidtype, struct smb_sid *ssid);
103void ksmbd_init_domain(u32 *sub_auth);
104size_t smb_acl_sec_desc_scratch_len(struct smb_fattr *fattr,
105		struct smb_ntsd *ppntsd, int ppntsd_size, int addition_info);
106
107static inline uid_t posix_acl_uid_translate(struct mnt_idmap *idmap,
108					    struct posix_acl_entry *pace)
109{
110	vfsuid_t vfsuid;
111
112	/* If this is an idmapped mount, apply the idmapping. */
113	vfsuid = make_vfsuid(idmap, &init_user_ns, pace->e_uid);
114
115	/* Translate the kuid into a userspace id ksmbd would see. */
116	return from_kuid(&init_user_ns, vfsuid_into_kuid(vfsuid));
117}
118
119static inline gid_t posix_acl_gid_translate(struct mnt_idmap *idmap,
120					    struct posix_acl_entry *pace)
121{
122	vfsgid_t vfsgid;
123
124	/* If this is an idmapped mount, apply the idmapping. */
125	vfsgid = make_vfsgid(idmap, &init_user_ns, pace->e_gid);
126
127	/* Translate the kgid into a userspace id ksmbd would see. */
128	return from_kgid(&init_user_ns, vfsgid_into_kgid(vfsgid));
129}
130
131#endif /* _SMBACL_H */