[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>
#include <linux/list.h>
#include <linux/rculist.h>
#include <linux/lsm_audit.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 */
	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 {
	struct list_head	list;
	char			*smk_subject;
	char			*smk_object;
	int			smk_access;
};

/*
 * 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 list_head	list;
	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 list_head	list;
	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="

#define SMACK_CIPSO_OPTION 	"-CIPSO"

/*
 * 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

/*
 * Number of access types used by Smack (rwxa)
 */
#define SMK_NUM_ACCESS_TYPE 4

/*
 * Smack audit data; is empty if CONFIG_AUDIT not set
 * to save some stack
 */
struct smk_audit_info {
#ifdef CONFIG_AUDIT
	struct common_audit_data a;
#endif
};
/*
 * 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, struct smk_audit_info *);
int smk_curacc(char *, u32, struct smk_audit_info *);
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 const char *smack_cipso_option;

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 list_head smack_known_list;
extern struct list_head smack_rule_list;
extern struct list_head smk_netlbladdr_list;

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;
}

/*
 * logging functions
 */
#define SMACK_AUDIT_DENIED 0x1
#define SMACK_AUDIT_ACCEPT 0x2
extern int log_policy;

void smack_log(char *subject_label, char *object_label,
		int request,
		int result, struct smk_audit_info *auditdata);

#ifdef CONFIG_AUDIT

/*
 * some inline functions to set up audit data
 * they do nothing if CONFIG_AUDIT is not set
 *
 */
static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
			       char type)
{
	memset(a, 0, sizeof(*a));
	a->a.type = type;
	a->a.smack_audit_data.function = func;
}

static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
					 struct task_struct *t)
{
	a->a.u.tsk = t;
}
static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
						    struct dentry *d)
{
	a->a.u.fs.path.dentry = d;
}
static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
						 struct vfsmount *m)
{
	a->a.u.fs.path.mnt = m;
}
static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
					      struct inode *i)
{
	a->a.u.fs.inode = i;
}
static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
					     struct path p)
{
	a->a.u.fs.path = p;
}
static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
					    struct sock *sk)
{
	a->a.u.net.sk = sk;
}

#else /* no AUDIT */

static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
			       char type)
{
}
static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
					 struct task_struct *t)
{
}
static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
						    struct dentry *d)
{
}
static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
						 struct vfsmount *m)
{
}
static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
					      struct inode *i)
{
}
static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
					     struct path p)
{
}
static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
					    struct sock *sk)
{
}
#endif

#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	20	#include <net/netlabel.h>
7198e2ee EB	21	#include <linux/list.h>
7198e2ee EB	22	#include <linux/rculist.h>
ecfcc53f	23	#include <linux/lsm_audit.h>
e114e473 CS	24
	25	/*
	26	* Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
	27	* bigger than can be used, and 24 is the next lower multiple
	28	* of 8, and there are too many issues if there isn't space set
	29	* aside for the terminating null byte.
	30	*/
	31	#define SMK_MAXLEN 23
	32	#define SMK_LABELLEN (SMK_MAXLEN+1)
	33
e114e473 CS	34	struct superblock_smack {
	35	char *smk_root;
	36	char *smk_floor;
	37	char *smk_hat;
	38	char *smk_default;
	39	int smk_initialized;
	40	spinlock_t smk_sblock; /* for initialization */
	41	};
	42
	43	struct socket_smack {
	44	char smk_out; / outbound label */
	45	char smk_in; / inbound label */
	46	char smk_packet[SMK_LABELLEN]; /* TCP peer label */
	47	};
	48
	49	/*
	50	* Inode smack data
	51	*/
	52	struct inode_smack {
	53	char smk_inode; / label of the fso */
	54	struct mutex smk_lock; /* initialization lock */
	55	int smk_flags; /* smack inode flags */
	56	};
	57
	58	#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
	59
	60	/*
	61	* A label access rule.
	62	*/
	63	struct smack_rule {
7198e2ee EB	64	struct list_head list;
	65	char *smk_subject;
	66	char *smk_object;
	67	int smk_access;
e114e473 CS	68	};
	69
	70	/*
	71	* An entry in the table mapping smack values to
	72	* CIPSO level/category-set values.
	73	*/
	74	struct smack_cipso {
	75	int smk_level;
	76	char smk_catset[SMK_LABELLEN];
	77	};
	78
6d3dc07c CS	79	/*
	80	* An entry in the table identifying hosts.
	81	*/
	82	struct smk_netlbladdr {
7198e2ee	83	struct list_head list;
6d3dc07c CS	84	struct sockaddr_in smk_host; /* network address */
	85	struct in_addr smk_mask; /* network mask */
	86	char smk_label; / label */
	87	};
	88
e114e473 CS	89	/*
	90	* This is the repository for labels seen so that it is
	91	* not necessary to keep allocating tiny chuncks of memory
	92	* and so that they can be shared.
	93	*
	94	* Labels are never modified in place. Anytime a label
	95	* is imported (e.g. xattrset on a file) the list is checked
	96	* for it and it is added if it doesn't exist. The address
	97	* is passed out in either case. Entries are added, but
	98	* never deleted.
	99	*
	100	* Since labels are hanging around anyway it doesn't
	101	* hurt to maintain a secid for those awkward situations
	102	* where kernel components that ought to use LSM independent
	103	* interfaces don't. The secid should go away when all of
	104	* these components have been repaired.
	105	*
	106	* If there is a cipso value associated with the label it
	107	* gets stored here, too. This will most likely be rare as
	108	* the cipso direct mapping in used internally.
	109	*/
	110	struct smack_known {
7198e2ee	111	struct list_head list;
e114e473 CS	112	char smk_known[SMK_LABELLEN];
	113	u32 smk_secid;
	114	struct smack_cipso *smk_cipso;
	115	spinlock_t smk_cipsolock; /* for changing cipso map */
	116	};
	117
	118	/*
	119	* Mount options
	120	*/
	121	#define SMK_FSDEFAULT "smackfsdef="
	122	#define SMK_FSFLOOR "smackfsfloor="
	123	#define SMK_FSHAT "smackfshat="
	124	#define SMK_FSROOT "smackfsroot="
	125
4303154e EB	126	#define SMACK_CIPSO_OPTION "-CIPSO"
4303154e EB	127
e114e473	128	/*
6d3dc07c CS	129	* How communications on this socket are treated.
	130	* Usually it's determined by the underlying netlabel code
	131	* but there are certain cases, including single label hosts
	132	* and potentially single label interfaces for which the
	133	* treatment can not be known in advance.
	134	*
	135	* The possibility of additional labeling schemes being
	136	* introduced in the future exists as well.
	137	*/
	138	#define SMACK_UNLABELED_SOCKET 0
	139	#define SMACK_CIPSO_SOCKET 1
	140
	141	/*
	142	* smackfs magic number
e114e473 CS	143	* smackfs macic number
	144	*/
	145	#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
	146
	147	/*
	148	* A limit on the number of entries in the lists
	149	* makes some of the list administration easier.
	150	*/
	151	#define SMACK_LIST_MAX 10000
	152
	153	/*
	154	* CIPSO defaults.
	155	*/
	156	#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
6d3dc07c	157	#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
e114e473 CS	158	#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
	159	#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
	160	#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
	161	#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
	162
	163	/*
	164	* Just to make the common cases easier to deal with
	165	*/
	166	#define MAY_ANY (MAY_READ \| MAY_WRITE \| MAY_APPEND \| MAY_EXEC)
	167	#define MAY_ANYREAD (MAY_READ \| MAY_EXEC)
	168	#define MAY_ANYWRITE (MAY_WRITE \| MAY_APPEND)
	169	#define MAY_READWRITE (MAY_READ \| MAY_WRITE)
	170	#define MAY_NOT 0
	171
ecfcc53f EB	172	/*
	173	* Number of access types used by Smack (rwxa)
	174	*/
	175	#define SMK_NUM_ACCESS_TYPE 4
	176
	177	/*
	178	* Smack audit data; is empty if CONFIG_AUDIT not set
	179	* to save some stack
	180	*/
	181	struct smk_audit_info {
	182	#ifdef CONFIG_AUDIT
	183	struct common_audit_data a;
	184	#endif
	185	};
e114e473 CS	186	/*
	187	* These functions are in smack_lsm.c
	188	*/
	189	struct inode_smack new_inode_smack(char );
	190
	191	/*
	192	* These functions are in smack_access.c
	193	*/
ecfcc53f EB	194	int smk_access(char , char , int, struct smk_audit_info *);
ecfcc53f EB	195	int smk_curacc(char , u32, struct smk_audit_info );
e114e473 CS	196	int smack_to_cipso(const char , struct smack_cipso );
	197	void smack_from_cipso(u32, char , char );
	198	char *smack_from_secid(const u32);
	199	char smk_import(const char , int);
	200	struct smack_known smk_import_entry(const char , int);
	201	u32 smack_to_secid(const char *);
	202
	203	/*
	204	* Shared data.
	205	*/
	206	extern int smack_cipso_direct;
e114e473	207	extern char *smack_net_ambient;
15446235	208	extern char *smack_onlycap;
4303154e	209	extern const char *smack_cipso_option;
e114e473	210
e114e473 CS	211	extern struct smack_known smack_known_floor;
	212	extern struct smack_known smack_known_hat;
	213	extern struct smack_known smack_known_huh;
	214	extern struct smack_known smack_known_invalid;
	215	extern struct smack_known smack_known_star;
6d3dc07c	216	extern struct smack_known smack_known_web;
e114e473	217
7198e2ee EB	218	extern struct list_head smack_known_list;
	219	extern struct list_head smack_rule_list;
	220	extern struct list_head smk_netlbladdr_list;
	221
076c54c5	222	extern struct security_operations smack_ops;
e114e473 CS	223
	224	/*
	225	* Stricly for CIPSO level manipulation.
	226	* Set the category bit number in a smack label sized buffer.
	227	*/
	228	static inline void smack_catset_bit(int cat, char *catsetp)
	229	{
	230	if (cat > SMK_LABELLEN * 8)
	231	return;
	232
	233	catsetp[(cat - 1) / 8] \|= 0x80 >> ((cat - 1) % 8);
	234	}
	235
	236	/*
	237	* Present a pointer to the smack label in an inode blob.
	238	*/
	239	static inline char smk_of_inode(const struct inode isp)
	240	{
	241	struct inode_smack *sip = isp->i_security;
	242	return sip->smk_inode;
	243	}
	244
ecfcc53f EB	245	/*
	246	* logging functions
	247	*/
	248	#define SMACK_AUDIT_DENIED 0x1
	249	#define SMACK_AUDIT_ACCEPT 0x2
	250	extern int log_policy;
	251
	252	void smack_log(char subject_label, char object_label,
	253	int request,
	254	int result, struct smk_audit_info *auditdata);
	255
	256	#ifdef CONFIG_AUDIT
	257
	258	/*
	259	* some inline functions to set up audit data
	260	* they do nothing if CONFIG_AUDIT is not set
	261	*
	262	*/
	263	static inline void smk_ad_init(struct smk_audit_info a, const char func,
	264	char type)
	265	{
	266	memset(a, 0, sizeof(*a));
	267	a->a.type = type;
d4131ded	268	a->a.smack_audit_data.function = func;
ecfcc53f EB	269	}
	270
	271	static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
	272	struct task_struct *t)
	273	{
	274	a->a.u.tsk = t;
	275	}
	276	static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
	277	struct dentry *d)
	278	{
	279	a->a.u.fs.path.dentry = d;
	280	}
	281	static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
	282	struct vfsmount *m)
	283	{
	284	a->a.u.fs.path.mnt = m;
	285	}
	286	static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
	287	struct inode *i)
	288	{
	289	a->a.u.fs.inode = i;
	290	}
	291	static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
	292	struct path p)
	293	{
	294	a->a.u.fs.path = p;
	295	}
	296	static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
	297	struct sock *sk)
	298	{
	299	a->a.u.net.sk = sk;
	300	}
	301
	302	#else /* no AUDIT */
	303
	304	static inline void smk_ad_init(struct smk_audit_info a, const char func,
	305	char type)
	306	{
	307	}
	308	static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
	309	struct task_struct *t)
	310	{
	311	}
	312	static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
	313	struct dentry *d)
	314	{
	315	}
	316	static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
	317	struct vfsmount *m)
	318	{
	319	}
	320	static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
	321	struct inode *i)
	322	{
	323	}
	324	static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
	325	struct path p)
	326	{
	327	}
	328	static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
	329	struct sock *sk)
	330	{
	331	}
	332	#endif
333
e114e473	334	#endif /* _SECURITY_SMACK_H */