/* 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 "../common/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"

/* 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

struct ksmbd_conn;

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, u16 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);
size_t smb_acl_sec_desc_scratch_len(struct smb_fattr *fattr,
                struct smb_ntsd *ppntsd, int ppntsd_size, int addition_info);

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 */