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-rw-r--r--fs/smb/server/smbacl.h238
1 files changed, 238 insertions, 0 deletions
diff --git a/fs/smb/server/smbacl.h b/fs/smb/server/smbacl.h
new file mode 100644
index 000000000..9651a2551
--- /dev/null
+++ b/fs/smb/server/smbacl.h
@@ -0,0 +1,238 @@
+/* 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)
+{
+ vfsuid_t vfsuid;
+
+ /* If this is an idmapped mount, apply the idmapping. */
+ vfsuid = make_vfsuid(mnt_userns, &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 user_namespace *mnt_userns,
+ struct posix_acl_entry *pace)
+{
+ vfsgid_t vfsgid;
+
+ /* If this is an idmapped mount, apply the idmapping. */
+ vfsgid = make_vfsgid(mnt_userns, &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 */