345 lines
8.6 KiB
C
345 lines
8.6 KiB
C
/*
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* Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*
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* Author:
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* Casey Schaufler <casey@schaufler-ca.com>
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*
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*/
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#ifndef _SECURITY_SMACK_H
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#define _SECURITY_SMACK_H
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#include <linux/capability.h>
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#include <linux/spinlock.h>
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#include <linux/security.h>
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#include <linux/in.h>
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#include <net/netlabel.h>
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#include <linux/list.h>
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#include <linux/rculist.h>
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#include <linux/lsm_audit.h>
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/*
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* Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
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* bigger than can be used, and 24 is the next lower multiple
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* of 8, and there are too many issues if there isn't space set
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* aside for the terminating null byte.
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*/
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#define SMK_MAXLEN 23
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#define SMK_LABELLEN (SMK_MAXLEN+1)
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struct superblock_smack {
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char *smk_root;
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char *smk_floor;
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char *smk_hat;
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char *smk_default;
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int smk_initialized;
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spinlock_t smk_sblock; /* for initialization */
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};
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struct socket_smack {
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char *smk_out; /* outbound label */
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char *smk_in; /* inbound label */
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char smk_packet[SMK_LABELLEN]; /* TCP peer label */
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};
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/*
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* Inode smack data
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*/
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struct inode_smack {
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char *smk_inode; /* label of the fso */
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struct mutex smk_lock; /* initialization lock */
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int smk_flags; /* smack inode flags */
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};
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#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
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/*
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* A label access rule.
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*/
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struct smack_rule {
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struct list_head list;
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char *smk_subject;
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char *smk_object;
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int smk_access;
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};
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/*
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* An entry in the table mapping smack values to
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* CIPSO level/category-set values.
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*/
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struct smack_cipso {
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int smk_level;
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char smk_catset[SMK_LABELLEN];
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};
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/*
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* An entry in the table identifying hosts.
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*/
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struct smk_netlbladdr {
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struct list_head list;
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struct sockaddr_in smk_host; /* network address */
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struct in_addr smk_mask; /* network mask */
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char *smk_label; /* label */
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};
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/*
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* This is the repository for labels seen so that it is
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* not necessary to keep allocating tiny chuncks of memory
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* and so that they can be shared.
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*
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* Labels are never modified in place. Anytime a label
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* is imported (e.g. xattrset on a file) the list is checked
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* for it and it is added if it doesn't exist. The address
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* is passed out in either case. Entries are added, but
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* never deleted.
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*
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* Since labels are hanging around anyway it doesn't
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* hurt to maintain a secid for those awkward situations
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* where kernel components that ought to use LSM independent
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* interfaces don't. The secid should go away when all of
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* these components have been repaired.
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*
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* If there is a cipso value associated with the label it
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* gets stored here, too. This will most likely be rare as
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* the cipso direct mapping in used internally.
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*/
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struct smack_known {
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struct list_head list;
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char smk_known[SMK_LABELLEN];
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u32 smk_secid;
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struct smack_cipso *smk_cipso;
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spinlock_t smk_cipsolock; /* for changing cipso map */
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};
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/*
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* Mount options
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*/
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#define SMK_FSDEFAULT "smackfsdef="
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#define SMK_FSFLOOR "smackfsfloor="
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#define SMK_FSHAT "smackfshat="
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#define SMK_FSROOT "smackfsroot="
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/*
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* xattr names
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*/
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#define XATTR_SMACK_SUFFIX "SMACK64"
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#define XATTR_SMACK_IPIN "SMACK64IPIN"
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#define XATTR_SMACK_IPOUT "SMACK64IPOUT"
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#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
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#define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
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#define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
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#define SMACK_CIPSO_OPTION "-CIPSO"
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/*
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* How communications on this socket are treated.
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* Usually it's determined by the underlying netlabel code
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* but there are certain cases, including single label hosts
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* and potentially single label interfaces for which the
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* treatment can not be known in advance.
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*
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* The possibility of additional labeling schemes being
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* introduced in the future exists as well.
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*/
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#define SMACK_UNLABELED_SOCKET 0
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#define SMACK_CIPSO_SOCKET 1
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/*
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* smackfs magic number
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* smackfs macic number
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*/
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#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
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/*
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* A limit on the number of entries in the lists
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* makes some of the list administration easier.
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*/
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#define SMACK_LIST_MAX 10000
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/*
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* CIPSO defaults.
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*/
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#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
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#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
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#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
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#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
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#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
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#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
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/*
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* Just to make the common cases easier to deal with
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*/
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#define MAY_ANY (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
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#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
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#define MAY_ANYWRITE (MAY_WRITE | MAY_APPEND)
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#define MAY_READWRITE (MAY_READ | MAY_WRITE)
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#define MAY_NOT 0
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/*
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* Number of access types used by Smack (rwxa)
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*/
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#define SMK_NUM_ACCESS_TYPE 4
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/*
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* Smack audit data; is empty if CONFIG_AUDIT not set
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* to save some stack
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*/
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struct smk_audit_info {
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#ifdef CONFIG_AUDIT
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struct common_audit_data a;
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#endif
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};
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/*
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* These functions are in smack_lsm.c
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*/
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struct inode_smack *new_inode_smack(char *);
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/*
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* These functions are in smack_access.c
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*/
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int smk_access(char *, char *, int, struct smk_audit_info *);
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int smk_curacc(char *, u32, struct smk_audit_info *);
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int smack_to_cipso(const char *, struct smack_cipso *);
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void smack_from_cipso(u32, char *, char *);
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char *smack_from_secid(const u32);
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char *smk_import(const char *, int);
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struct smack_known *smk_import_entry(const char *, int);
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u32 smack_to_secid(const char *);
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/*
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* Shared data.
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*/
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extern int smack_cipso_direct;
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extern char *smack_net_ambient;
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extern char *smack_onlycap;
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extern const char *smack_cipso_option;
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extern struct smack_known smack_known_floor;
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extern struct smack_known smack_known_hat;
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extern struct smack_known smack_known_huh;
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extern struct smack_known smack_known_invalid;
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extern struct smack_known smack_known_star;
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extern struct smack_known smack_known_web;
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extern struct list_head smack_known_list;
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extern struct list_head smack_rule_list;
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extern struct list_head smk_netlbladdr_list;
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extern struct security_operations smack_ops;
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/*
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* Stricly for CIPSO level manipulation.
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* Set the category bit number in a smack label sized buffer.
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*/
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static inline void smack_catset_bit(int cat, char *catsetp)
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{
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if (cat > SMK_LABELLEN * 8)
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return;
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catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
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}
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/*
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* Present a pointer to the smack label in an inode blob.
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*/
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static inline char *smk_of_inode(const struct inode *isp)
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{
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struct inode_smack *sip = isp->i_security;
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return sip->smk_inode;
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}
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/*
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* logging functions
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*/
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#define SMACK_AUDIT_DENIED 0x1
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#define SMACK_AUDIT_ACCEPT 0x2
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extern int log_policy;
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void smack_log(char *subject_label, char *object_label,
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int request,
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int result, struct smk_audit_info *auditdata);
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#ifdef CONFIG_AUDIT
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/*
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* some inline functions to set up audit data
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* they do nothing if CONFIG_AUDIT is not set
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*
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*/
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static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
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char type)
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{
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memset(a, 0, sizeof(*a));
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a->a.type = type;
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a->a.function = func;
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}
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static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
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struct task_struct *t)
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{
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a->a.u.tsk = t;
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}
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static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
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struct dentry *d)
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{
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a->a.u.fs.path.dentry = d;
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}
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static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
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struct vfsmount *m)
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{
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a->a.u.fs.path.mnt = m;
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}
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static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
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struct inode *i)
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{
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a->a.u.fs.inode = i;
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}
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static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
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struct path p)
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{
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a->a.u.fs.path = p;
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}
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static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
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struct sock *sk)
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{
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a->a.u.net.sk = sk;
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}
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#else /* no AUDIT */
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static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
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char type)
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{
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}
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static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
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struct task_struct *t)
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{
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}
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static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
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struct dentry *d)
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{
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}
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static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
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struct vfsmount *m)
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{
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}
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static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
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struct inode *i)
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{
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}
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static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
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struct path p)
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{
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}
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static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
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struct sock *sk)
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{
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}
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#endif
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#endif /* _SECURITY_SMACK_H */
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