[net-next-2.6.git] / security / smack / smack.h

/*
 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation, version 2.
 *
 * Author:
 *      Casey Schaufler <casey@schaufler-ca.com>
 *
 */

#ifndef _SECURITY_SMACK_H
#define _SECURITY_SMACK_H

#include <linux/capability.h>
#include <linux/spinlock.h>
#include <linux/security.h>
#include <linux/in.h>
#include <net/netlabel.h>

/*
 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
 * bigger than can be used, and 24 is the next lower multiple
 * of 8, and there are too many issues if there isn't space set
 * aside for the terminating null byte.
 */
#define SMK_MAXLEN	23
#define SMK_LABELLEN	(SMK_MAXLEN+1)

struct superblock_smack {
	char		*smk_root;
	char		*smk_floor;
	char		*smk_hat;
	char		*smk_default;
	int		smk_initialized;
	spinlock_t	smk_sblock;	/* for initialization */
};

struct socket_smack {
	char		*smk_out;			/* outbound label */
	char		*smk_in;			/* inbound label */
	int		smk_labeled;			/* label scheme */
	char		smk_packet[SMK_LABELLEN];	/* TCP peer label */
};

/*
 * Inode smack data
 */
struct inode_smack {
	char		*smk_inode;	/* label of the fso */
	struct mutex	smk_lock;	/* initialization lock */
	int		smk_flags;	/* smack inode flags */
};

#define	SMK_INODE_INSTANT	0x01	/* inode is instantiated */

/*
 * A label access rule.
 */
struct smack_rule {
	char	*smk_subject;
	char	*smk_object;
	int	smk_access;
};

/*
 * An entry in the table of permitted label accesses.
 */
struct smk_list_entry {
	struct smk_list_entry	*smk_next;
	struct smack_rule	smk_rule;
};

/*
 * An entry in the table mapping smack values to
 * CIPSO level/category-set values.
 */
struct smack_cipso {
	int	smk_level;
	char	smk_catset[SMK_LABELLEN];
};

/*
 * An entry in the table identifying hosts.
 */
struct smk_netlbladdr {
	struct smk_netlbladdr	*smk_next;
	struct sockaddr_in	smk_host;	/* network address */
	struct in_addr		smk_mask;	/* network mask */
	char			*smk_label;	/* label */
};

/*
 * This is the repository for labels seen so that it is
 * not necessary to keep allocating tiny chuncks of memory
 * and so that they can be shared.
 *
 * Labels are never modified in place. Anytime a label
 * is imported (e.g. xattrset on a file) the list is checked
 * for it and it is added if it doesn't exist. The address
 * is passed out in either case. Entries are added, but
 * never deleted.
 *
 * Since labels are hanging around anyway it doesn't
 * hurt to maintain a secid for those awkward situations
 * where kernel components that ought to use LSM independent
 * interfaces don't. The secid should go away when all of
 * these components have been repaired.
 *
 * If there is a cipso value associated with the label it
 * gets stored here, too. This will most likely be rare as
 * the cipso direct mapping in used internally.
 */
struct smack_known {
	struct smack_known	*smk_next;
	char			smk_known[SMK_LABELLEN];
	u32			smk_secid;
	struct smack_cipso	*smk_cipso;
	spinlock_t		smk_cipsolock; /* for changing cipso map */
};

/*
 * Mount options
 */
#define SMK_FSDEFAULT	"smackfsdef="
#define SMK_FSFLOOR	"smackfsfloor="
#define SMK_FSHAT	"smackfshat="
#define SMK_FSROOT	"smackfsroot="

/*
 * xattr names
 */
#define XATTR_SMACK_SUFFIX	"SMACK64"
#define XATTR_SMACK_IPIN	"SMACK64IPIN"
#define XATTR_SMACK_IPOUT	"SMACK64IPOUT"
#define XATTR_NAME_SMACK	XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
#define XATTR_NAME_SMACKIPIN	XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
#define XATTR_NAME_SMACKIPOUT	XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT

/*
 * How communications on this socket are treated.
 * Usually it's determined by the underlying netlabel code
 * but there are certain cases, including single label hosts
 * and potentially single label interfaces for which the
 * treatment can not be known in advance.
 *
 * The possibility of additional labeling schemes being
 * introduced in the future exists as well.
 */
#define SMACK_UNLABELED_SOCKET	0
#define SMACK_CIPSO_SOCKET	1

/*
 * smackfs magic number
 * smackfs macic number
 */
#define SMACK_MAGIC	0x43415d53 /* "SMAC" */

/*
 * A limit on the number of entries in the lists
 * makes some of the list administration easier.
 */
#define SMACK_LIST_MAX	10000

/*
 * CIPSO defaults.
 */
#define SMACK_CIPSO_DOI_DEFAULT		3	/* Historical */
#define SMACK_CIPSO_DOI_INVALID		-1	/* Not a DOI */
#define SMACK_CIPSO_DIRECT_DEFAULT	250	/* Arbitrary */
#define SMACK_CIPSO_MAXCATVAL		63	/* Bigger gets harder */
#define SMACK_CIPSO_MAXLEVEL            255     /* CIPSO 2.2 standard */
#define SMACK_CIPSO_MAXCATNUM           239     /* CIPSO 2.2 standard */

/*
 * Just to make the common cases easier to deal with
 */
#define MAY_ANY		(MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
#define MAY_ANYREAD	(MAY_READ | MAY_EXEC)
#define MAY_ANYWRITE	(MAY_WRITE | MAY_APPEND)
#define MAY_READWRITE	(MAY_READ | MAY_WRITE)
#define MAY_NOT		0

/*
 * These functions are in smack_lsm.c
 */
struct inode_smack *new_inode_smack(char *);

/*
 * These functions are in smack_access.c
 */
int smk_access(char *, char *, int);
int smk_curacc(char *, u32);
int smack_to_cipso(const char *, struct smack_cipso *);
void smack_from_cipso(u32, char *, char *);
char *smack_from_secid(const u32);
char *smk_import(const char *, int);
struct smack_known *smk_import_entry(const char *, int);
u32 smack_to_secid(const char *);

/*
 * Shared data.
 */
extern int smack_cipso_direct;
extern char *smack_net_ambient;
extern char *smack_onlycap;

extern struct smack_known *smack_known;
extern struct smack_known smack_known_floor;
extern struct smack_known smack_known_hat;
extern struct smack_known smack_known_huh;
extern struct smack_known smack_known_invalid;
extern struct smack_known smack_known_star;
extern struct smack_known smack_known_web;

extern struct smk_list_entry *smack_list;
extern struct smk_netlbladdr *smack_netlbladdrs;
extern struct security_operations smack_ops;

/*
 * Stricly for CIPSO level manipulation.
 * Set the category bit number in a smack label sized buffer.
 */
static inline void smack_catset_bit(int cat, char *catsetp)
{
	if (cat > SMK_LABELLEN * 8)
		return;

	catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
}

/*
 * Present a pointer to the smack label in an inode blob.
 */
static inline char *smk_of_inode(const struct inode *isp)
{
	struct inode_smack *sip = isp->i_security;
	return sip->smk_inode;
}

#endif  /* _SECURITY_SMACK_H */
Commit	Line	Data
e114e473 CS	1	/*
	2	* Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation, version 2.
	7	*
	8	* Author:
	9	* Casey Schaufler <casey@schaufler-ca.com>
	10	*
	11	*/
	12
	13	#ifndef _SECURITY_SMACK_H
	14	#define _SECURITY_SMACK_H
	15
	16	#include <linux/capability.h>
	17	#include <linux/spinlock.h>
076c54c5	18	#include <linux/security.h>
6d3dc07c	19	#include <linux/in.h>
e114e473 CS	20	#include <net/netlabel.h>
	21
	22	/*
	23	* Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
	24	* bigger than can be used, and 24 is the next lower multiple
	25	* of 8, and there are too many issues if there isn't space set
	26	* aside for the terminating null byte.
	27	*/
	28	#define SMK_MAXLEN 23
	29	#define SMK_LABELLEN (SMK_MAXLEN+1)
	30
e114e473 CS	31	struct superblock_smack {
	32	char *smk_root;
	33	char *smk_floor;
	34	char *smk_hat;
	35	char *smk_default;
	36	int smk_initialized;
	37	spinlock_t smk_sblock; /* for initialization */
	38	};
	39
	40	struct socket_smack {
	41	char smk_out; / outbound label */
	42	char smk_in; / inbound label */
6d3dc07c	43	int smk_labeled; /* label scheme */
e114e473 CS	44	char smk_packet[SMK_LABELLEN]; /* TCP peer label */
	45	};
	46
	47	/*
	48	* Inode smack data
	49	*/
	50	struct inode_smack {
	51	char smk_inode; / label of the fso */
	52	struct mutex smk_lock; /* initialization lock */
	53	int smk_flags; /* smack inode flags */
	54	};
	55
	56	#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
	57
	58	/*
	59	* A label access rule.
	60	*/
	61	struct smack_rule {
	62	char *smk_subject;
	63	char *smk_object;
	64	int smk_access;
	65	};
	66
	67	/*
	68	* An entry in the table of permitted label accesses.
	69	*/
	70	struct smk_list_entry {
	71	struct smk_list_entry *smk_next;
	72	struct smack_rule smk_rule;
	73	};
	74
	75	/*
	76	* An entry in the table mapping smack values to
	77	* CIPSO level/category-set values.
	78	*/
	79	struct smack_cipso {
	80	int smk_level;
	81	char smk_catset[SMK_LABELLEN];
	82	};
	83
6d3dc07c CS	84	/*
	85	* An entry in the table identifying hosts.
	86	*/
	87	struct smk_netlbladdr {
	88	struct smk_netlbladdr *smk_next;
	89	struct sockaddr_in smk_host; /* network address */
	90	struct in_addr smk_mask; /* network mask */
	91	char smk_label; / label */
	92	};
	93
e114e473 CS	94	/*
	95	* This is the repository for labels seen so that it is
	96	* not necessary to keep allocating tiny chuncks of memory
	97	* and so that they can be shared.
	98	*
	99	* Labels are never modified in place. Anytime a label
	100	* is imported (e.g. xattrset on a file) the list is checked
	101	* for it and it is added if it doesn't exist. The address
	102	* is passed out in either case. Entries are added, but
	103	* never deleted.
	104	*
	105	* Since labels are hanging around anyway it doesn't
	106	* hurt to maintain a secid for those awkward situations
	107	* where kernel components that ought to use LSM independent
	108	* interfaces don't. The secid should go away when all of
	109	* these components have been repaired.
	110	*
	111	* If there is a cipso value associated with the label it
	112	* gets stored here, too. This will most likely be rare as
	113	* the cipso direct mapping in used internally.
	114	*/
	115	struct smack_known {
	116	struct smack_known *smk_next;
	117	char smk_known[SMK_LABELLEN];
	118	u32 smk_secid;
	119	struct smack_cipso *smk_cipso;
	120	spinlock_t smk_cipsolock; /* for changing cipso map */
	121	};
	122
	123	/*
	124	* Mount options
	125	*/
	126	#define SMK_FSDEFAULT "smackfsdef="
	127	#define SMK_FSFLOOR "smackfsfloor="
	128	#define SMK_FSHAT "smackfshat="
	129	#define SMK_FSROOT "smackfsroot="
	130
	131	/*
	132	* xattr names
	133	*/
	134	#define XATTR_SMACK_SUFFIX "SMACK64"
	135	#define XATTR_SMACK_IPIN "SMACK64IPIN"
	136	#define XATTR_SMACK_IPOUT "SMACK64IPOUT"
	137	#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
	138	#define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
	139	#define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
	140
	141	/*
6d3dc07c CS	142	* How communications on this socket are treated.
	143	* Usually it's determined by the underlying netlabel code
	144	* but there are certain cases, including single label hosts
	145	* and potentially single label interfaces for which the
	146	* treatment can not be known in advance.
	147	*
	148	* The possibility of additional labeling schemes being
	149	* introduced in the future exists as well.
	150	*/
	151	#define SMACK_UNLABELED_SOCKET 0
	152	#define SMACK_CIPSO_SOCKET 1
	153
	154	/*
	155	* smackfs magic number
e114e473 CS	156	* smackfs macic number
	157	*/
	158	#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
	159
	160	/*
	161	* A limit on the number of entries in the lists
	162	* makes some of the list administration easier.
	163	*/
	164	#define SMACK_LIST_MAX 10000
	165
	166	/*
	167	* CIPSO defaults.
	168	*/
	169	#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
6d3dc07c	170	#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
e114e473 CS	171	#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
	172	#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
	173	#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
	174	#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
	175
	176	/*
	177	* Just to make the common cases easier to deal with
	178	*/
	179	#define MAY_ANY (MAY_READ \| MAY_WRITE \| MAY_APPEND \| MAY_EXEC)
	180	#define MAY_ANYREAD (MAY_READ \| MAY_EXEC)
	181	#define MAY_ANYWRITE (MAY_WRITE \| MAY_APPEND)
	182	#define MAY_READWRITE (MAY_READ \| MAY_WRITE)
	183	#define MAY_NOT 0
	184
	185	/*
	186	* These functions are in smack_lsm.c
	187	*/
	188	struct inode_smack new_inode_smack(char );
	189
	190	/*
	191	* These functions are in smack_access.c
	192	*/
	193	int smk_access(char , char , int);
	194	int smk_curacc(char *, u32);
	195	int smack_to_cipso(const char , struct smack_cipso );
	196	void smack_from_cipso(u32, char , char );
	197	char *smack_from_secid(const u32);
	198	char smk_import(const char , int);
	199	struct smack_known smk_import_entry(const char , int);
	200	u32 smack_to_secid(const char *);
	201
	202	/*
	203	* Shared data.
	204	*/
	205	extern int smack_cipso_direct;
e114e473	206	extern char *smack_net_ambient;
15446235	207	extern char *smack_onlycap;
e114e473 CS	208
	209	extern struct smack_known *smack_known;
	210	extern struct smack_known smack_known_floor;
	211	extern struct smack_known smack_known_hat;
	212	extern struct smack_known smack_known_huh;
	213	extern struct smack_known smack_known_invalid;
	214	extern struct smack_known smack_known_star;
6d3dc07c	215	extern struct smack_known smack_known_web;
e114e473 CS	216
e114e473 CS	217	extern struct smk_list_entry *smack_list;
6d3dc07c	218	extern struct smk_netlbladdr *smack_netlbladdrs;
076c54c5	219	extern struct security_operations smack_ops;
e114e473 CS	220
	221	/*
	222	* Stricly for CIPSO level manipulation.
	223	* Set the category bit number in a smack label sized buffer.
	224	*/
	225	static inline void smack_catset_bit(int cat, char *catsetp)
	226	{
	227	if (cat > SMK_LABELLEN * 8)
	228	return;
	229
	230	catsetp[(cat - 1) / 8] \|= 0x80 >> ((cat - 1) % 8);
	231	}
	232
	233	/*
	234	* Present a pointer to the smack label in an inode blob.
	235	*/
	236	static inline char smk_of_inode(const struct inode isp)
	237	{
	238	struct inode_smack *sip = isp->i_security;
	239	return sip->smk_inode;
	240	}
	241
	242	#endif /* _SECURITY_SMACK_H */