[mirror_ubuntu-artful-kernel.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/lsm_hooks.h>
#include <linux/in.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <linux/in6.h>
#endif /* CONFIG_IPV6 */
#include <net/netlabel.h>
#include <linux/list.h>
#include <linux/rculist.h>
#include <linux/lsm_audit.h>

/*
 * Use IPv6 port labeling if IPv6 is enabled and secmarks
 * are not being used.
 */
#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
#define SMACK_IPV6_PORT_LABELING 1
#endif

#if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
#define SMACK_IPV6_SECMARK_LABELING 1
#endif

/*
 * Smack labels were limited to 23 characters for a long time.
 */
#define SMK_LABELLEN	24
#define SMK_LONGLABEL	256

/*
 * 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.
 *
 * The cipso value associated with the label gets stored here, too.
 *
 * Keep the access rules for this subject label here so that
 * the entire set of rules does not need to be examined every
 * time.
 */
struct smack_known {
	struct list_head		list;
	struct hlist_node		smk_hashed;
	char				*smk_known;
	u32				smk_secid;
	struct netlbl_lsm_secattr	smk_netlabel;	/* on wire labels */
	struct list_head		smk_rules;	/* access rules */
	struct mutex			smk_rules_lock;	/* lock for rules */
};

/*
 * Maximum number of bytes for the levels in a CIPSO IP option.
 * 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_CIPSOLEN	24

struct superblock_smack {
	struct smack_known	*smk_root;
	struct smack_known	*smk_floor;
	struct smack_known	*smk_hat;
	struct smack_known	*smk_default;
	int			smk_flags;
};

/*
 * Superblock flags
 */
#define SMK_SB_INITIALIZED	0x01
#define SMK_SB_UNTRUSTED	0x02

struct socket_smack {
	struct smack_known	*smk_out;	/* outbound label */
	struct smack_known	*smk_in;	/* inbound label */
	struct smack_known	*smk_packet;	/* TCP peer label */
};

/*
 * Inode smack data
 */
struct inode_smack {
	struct smack_known	*smk_inode;	/* label of the fso */
	struct smack_known	*smk_task;	/* label of the task */
	struct smack_known	*smk_mmap;	/* label of the mmap domain */
	struct mutex		smk_lock;	/* initialization lock */
	int			smk_flags;	/* smack inode flags */
	struct rcu_head         smk_rcu;	/* for freeing inode_smack */
};

struct task_smack {
	struct smack_known	*smk_task;	/* label for access control */
	struct smack_known	*smk_forked;	/* label when forked */
	struct list_head	smk_rules;	/* per task access rules */
	struct mutex		smk_rules_lock;	/* lock for the rules */
	struct list_head	smk_relabel;	/* transit allowed labels */
};

#define	SMK_INODE_INSTANT	0x01	/* inode is instantiated */
#define	SMK_INODE_TRANSMUTE	0x02	/* directory is transmuting */
#define	SMK_INODE_CHANGED	0x04	/* smack was transmuted */
#define	SMK_INODE_IMPURE	0x08	/* involved in an impure transaction */

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

/*
 * An entry in the table identifying IPv4 hosts.
 */
struct smk_net4addr {
	struct list_head	list;
	struct in_addr		smk_host;	/* network address */
	struct in_addr		smk_mask;	/* network mask */
	int			smk_masks;	/* mask size */
	struct smack_known	*smk_label;	/* label */
};

#if IS_ENABLED(CONFIG_IPV6)
/*
 * An entry in the table identifying IPv6 hosts.
 */
struct smk_net6addr {
	struct list_head	list;
	struct in6_addr		smk_host;	/* network address */
	struct in6_addr		smk_mask;	/* network mask */
	int			smk_masks;	/* mask size */
	struct smack_known	*smk_label;	/* label */
};
#endif /* CONFIG_IPV6 */

#ifdef SMACK_IPV6_PORT_LABELING
/*
 * An entry in the table identifying ports.
 */
struct smk_port_label {
	struct list_head	list;
	struct sock		*smk_sock;	/* socket initialized on */
	unsigned short		smk_port;	/* the port number */
	struct smack_known	*smk_in;	/* inbound label */
	struct smack_known	*smk_out;	/* outgoing label */
	short			smk_sock_type;	/* Socket type */
	short			smk_can_reuse;
};
#endif /* SMACK_IPV6_PORT_LABELING */

struct smack_known_list_elem {
	struct list_head	list;
	struct smack_known	*smk_label;
};

/* Super block security struct flags for mount options */
#define FSDEFAULT_MNT	0x01
#define FSFLOOR_MNT	0x02
#define FSHAT_MNT	0x04
#define FSROOT_MNT	0x08
#define FSTRANS_MNT	0x10

#define NUM_SMK_MNT_OPTS	5

enum {
	Opt_error = -1,
	Opt_fsdefault = 1,
	Opt_fsfloor = 2,
	Opt_fshat = 3,
	Opt_fsroot = 4,
	Opt_fstransmute = 5,
};

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

#define SMACK_DELETE_OPTION	"-DELETE"
#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

/*
 * 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_MAPPED_DEFAULT	251	/* Also arbitrary */
#define SMACK_CIPSO_MAXLEVEL            255     /* CIPSO 2.2 standard */
/*
 * CIPSO 2.2 standard is 239, but Smack wants to use the
 * categories in a structured way that limits the value to
 * the bits in 23 bytes, hence the unusual number.
 */
#define SMACK_CIPSO_MAXCATNUM           184     /* 23 * 8 */

/*
 * Ptrace rules
 */
#define SMACK_PTRACE_DEFAULT	0
#define SMACK_PTRACE_EXACT	1
#define SMACK_PTRACE_DRACONIAN	2
#define SMACK_PTRACE_MAX	SMACK_PTRACE_DRACONIAN

/*
 * Flags for untraditional access modes.
 * It shouldn't be necessary to avoid conflicts with definitions
 * in fs.h, but do so anyway.
 */
#define MAY_TRANSMUTE	0x00001000	/* Controls directory labeling */
#define MAY_LOCK	0x00002000	/* Locks should be writes, but ... */
#define MAY_BRINGUP	0x00004000	/* Report use of this rule */

/*
 * The policy for delivering signals is configurable.
 * It is usually "write", but can be "append".
 */
#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
#define MAY_DELIVER	MAY_APPEND	/* Signal delivery requires append */
#else
#define MAY_DELIVER	MAY_WRITE	/* Signal delivery requires write */
#endif

#define SMACK_BRINGUP_ALLOW		1	/* Allow bringup mode */
#define SMACK_UNCONFINED_SUBJECT	2	/* Allow unconfined label */
#define SMACK_UNCONFINED_OBJECT		3	/* Allow unconfined label */

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

/*
 * Number of access types used by Smack (rwxatlb)
 */
#define SMK_NUM_ACCESS_TYPE 7

/* SMACK data */
struct smack_audit_data {
	const char *function;
	char *subject;
	char *object;
	char *request;
	int result;
};

/*
 * 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;
	struct smack_audit_data sad;
#endif
};

/*
 * These functions are in smack_access.c
 */
int smk_access_entry(char *, char *, struct list_head *);
int smk_access(struct smack_known *, struct smack_known *,
	       int, struct smk_audit_info *);
int smk_tskacc(struct task_smack *, struct smack_known *,
	       u32, struct smk_audit_info *);
int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
struct smack_known *smack_from_secid(const u32);
char *smk_parse_smack(const char *string, int len);
int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
struct smack_known *smk_import_entry(const char *, int);
void smk_insert_entry(struct smack_known *skp);
struct smack_known *smk_find_entry(const char *);
bool smack_privileged(int cap);
void smk_destroy_label_list(struct list_head *list);

/*
 * Shared data.
 */
extern int smack_enabled;
extern int smack_cipso_direct;
extern int smack_cipso_mapped;
extern struct smack_known *smack_net_ambient;
extern struct smack_known *smack_syslog_label;
#ifdef CONFIG_SECURITY_SMACK_BRINGUP
extern struct smack_known *smack_unconfined;
#endif
extern int smack_ptrace_rule;

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_star;
extern struct smack_known smack_known_web;

extern struct mutex	smack_known_lock;
extern struct list_head smack_known_list;
extern struct list_head smk_net4addr_list;
#if IS_ENABLED(CONFIG_IPV6)
extern struct list_head smk_net6addr_list;
#endif /* CONFIG_IPV6 */

extern struct mutex     smack_onlycap_lock;
extern struct list_head smack_onlycap_list;

#define SMACK_HASH_SLOTS 16
extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];

/*
 * Is the directory transmuting?
 */
static inline int smk_inode_transmutable(const struct inode *isp)
{
	struct inode_smack *sip = isp->i_security;
	return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
}

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

/*
 * Present a pointer to the smack label entry in an task blob.
 */
static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
{
	return tsp->smk_task;
}

static inline struct smack_known *smk_of_task_struct(const struct task_struct *t)
{
	struct smack_known *skp;

	rcu_read_lock();
	skp = smk_of_task(__task_cred(t)->security);
	rcu_read_unlock();
	return skp;
}

/*
 * Present a pointer to the forked smack label entry in an task blob.
 */
static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
{
	return tsp->smk_forked;
}

/*
 * Present a pointer to the smack label in the current task blob.
 */
static inline struct smack_known *smk_of_current(void)
{
	return smk_of_task(current_security());
}

/*
 * 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->sad, 0, sizeof(a->sad));
	a->a.type = type;
	a->a.smack_audit_data = &a->sad;
	a->a.smack_audit_data->function = func;
}

static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
				   char type, struct lsm_network_audit *net)
{
	smk_ad_init(a, func, type);
	memset(net, 0, sizeof(*net));
	a->a.u.net = net;
}

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.dentry = d;
}
static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
					      struct inode *i)
{
	a->a.u.inode = i;
}
static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
					     struct path p)
{
	a->a.u.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>
3c4ed7bd	18	#include <linux/lsm_hooks.h>
6d3dc07c	19	#include <linux/in.h>
21abb1ec CS	20	#if IS_ENABLED(CONFIG_IPV6)
	21	#include <linux/in6.h>
	22	#endif /* CONFIG_IPV6 */
e114e473	23	#include <net/netlabel.h>
7198e2ee EB	24	#include <linux/list.h>
7198e2ee EB	25	#include <linux/rculist.h>
ecfcc53f	26	#include <linux/lsm_audit.h>
e114e473	27
21abb1ec CS	28	/*
	29	* Use IPv6 port labeling if IPv6 is enabled and secmarks
	30	* are not being used.
	31	*/
	32	#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
	33	#define SMACK_IPV6_PORT_LABELING 1
	34	#endif
	35
	36	#if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
	37	#define SMACK_IPV6_SECMARK_LABELING 1
	38	#endif
	39
e114e473	40	/*
f7112e6c CS	41	* Smack labels were limited to 23 characters for a long time.
	42	*/
	43	#define SMK_LABELLEN 24
	44	#define SMK_LONGLABEL 256
	45
2f823ff8 CS	46	/*
	47	* This is the repository for labels seen so that it is
	48	* not necessary to keep allocating tiny chuncks of memory
	49	* and so that they can be shared.
	50	*
	51	* Labels are never modified in place. Anytime a label
	52	* is imported (e.g. xattrset on a file) the list is checked
	53	* for it and it is added if it doesn't exist. The address
	54	* is passed out in either case. Entries are added, but
	55	* never deleted.
	56	*
	57	* Since labels are hanging around anyway it doesn't
	58	* hurt to maintain a secid for those awkward situations
	59	* where kernel components that ought to use LSM independent
	60	* interfaces don't. The secid should go away when all of
	61	* these components have been repaired.
	62	*
	63	* The cipso value associated with the label gets stored here, too.
	64	*
	65	* Keep the access rules for this subject label here so that
	66	* the entire set of rules does not need to be examined every
	67	* time.
	68	*/
	69	struct smack_known {
	70	struct list_head list;
4d7cf4a1	71	struct hlist_node smk_hashed;
2f823ff8 CS	72	char *smk_known;
	73	u32 smk_secid;
	74	struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
	75	struct list_head smk_rules; /* access rules */
	76	struct mutex smk_rules_lock; /* lock for rules */
	77	};
	78
f7112e6c CS	79	/*
f7112e6c CS	80	* Maximum number of bytes for the levels in a CIPSO IP option.
e114e473 CS	81	* Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
	82	* bigger than can be used, and 24 is the next lower multiple
	83	* of 8, and there are too many issues if there isn't space set
	84	* aside for the terminating null byte.
	85	*/
f7112e6c	86	#define SMK_CIPSOLEN 24
e114e473	87
e114e473	88	struct superblock_smack {
21c7eae2 LP	89	struct smack_known *smk_root;
	90	struct smack_known *smk_floor;
	91	struct smack_known *smk_hat;
	92	struct smack_known *smk_default;
9f50eda2	93	int smk_flags;
e114e473 CS	94	};
e114e473 CS	95
9f50eda2 SF	96	/*
	97	* Superblock flags
	98	*/
	99	#define SMK_SB_INITIALIZED 0x01
	100	#define SMK_SB_UNTRUSTED 0x02
	101
e114e473	102	struct socket_smack {
2f823ff8	103	struct smack_known smk_out; / outbound label */
54e70ec5 CS	104	struct smack_known smk_in; / inbound label */
54e70ec5 CS	105	struct smack_known smk_packet; / TCP peer label */
e114e473 CS	106	};
	107
	108	/*
	109	* Inode smack data
	110	*/
	111	struct inode_smack {
21c7eae2	112	struct smack_known smk_inode; / label of the fso */
2f823ff8 CS	113	struct smack_known smk_task; / label of the task */
	114	struct smack_known smk_mmap; / label of the mmap domain */
	115	struct mutex smk_lock; /* initialization lock */
	116	int smk_flags; /* smack inode flags */
3d4f673a	117	struct rcu_head smk_rcu; /* for freeing inode_smack */
e114e473 CS	118	};
e114e473 CS	119
676dac4b	120	struct task_smack {
2f823ff8 CS	121	struct smack_known smk_task; / label for access control */
2f823ff8 CS	122	struct smack_known smk_forked; / label when forked */
7898e1f8 CS	123	struct list_head smk_rules; /* per task access rules */
7898e1f8 CS	124	struct mutex smk_rules_lock; /* lock for the rules */
38416e53	125	struct list_head smk_relabel; /* transit allowed labels */
676dac4b CS	126	};
676dac4b CS	127
e114e473	128	#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
5c6d1125	129	#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
2267b13a	130	#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
bf4b2fee	131	#define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */
e114e473 CS	132
	133	/*
	134	* A label access rule.
	135	*/
	136	struct smack_rule {
7198e2ee	137	struct list_head list;
2f823ff8	138	struct smack_known *smk_subject;
21c7eae2	139	struct smack_known *smk_object;
7198e2ee	140	int smk_access;
e114e473 CS	141	};
e114e473 CS	142
6d3dc07c	143	/*
21abb1ec	144	* An entry in the table identifying IPv4 hosts.
6d3dc07c	145	*/
21abb1ec	146	struct smk_net4addr {
7198e2ee	147	struct list_head list;
21abb1ec	148	struct in_addr smk_host; /* network address */
6d3dc07c	149	struct in_addr smk_mask; /* network mask */
21abb1ec CS	150	int smk_masks; /* mask size */
	151	struct smack_known smk_label; / label */
	152	};
	153
	154	#if IS_ENABLED(CONFIG_IPV6)
	155	/*
	156	* An entry in the table identifying IPv6 hosts.
	157	*/
	158	struct smk_net6addr {
	159	struct list_head list;
	160	struct in6_addr smk_host; /* network address */
	161	struct in6_addr smk_mask; /* network mask */
	162	int smk_masks; /* mask size */
21c7eae2	163	struct smack_known smk_label; / label */
6d3dc07c	164	};
21abb1ec	165	#endif /* CONFIG_IPV6 */
6d3dc07c	166
21abb1ec	167	#ifdef SMACK_IPV6_PORT_LABELING
c6739443 CS	168	/*
	169	* An entry in the table identifying ports.
	170	*/
	171	struct smk_port_label {
	172	struct list_head list;
	173	struct sock smk_sock; / socket initialized on */
	174	unsigned short smk_port; /* the port number */
54e70ec5	175	struct smack_known smk_in; / inbound label */
2f823ff8	176	struct smack_known smk_out; / outgoing label */
9d44c973	177	short smk_sock_type; /* Socket type */
0c96d1f5	178	short smk_can_reuse;
e114e473	179	};
21abb1ec	180	#endif /* SMACK_IPV6_PORT_LABELING */
e114e473	181
38416e53	182	struct smack_known_list_elem {
c0d77c88 RK	183	struct list_head list;
	184	struct smack_known *smk_label;
	185	};
	186
3bf2789c VT	187	/* Super block security struct flags for mount options */
	188	#define FSDEFAULT_MNT 0x01
	189	#define FSFLOOR_MNT 0x02
	190	#define FSHAT_MNT 0x04
	191	#define FSROOT_MNT 0x08
	192	#define FSTRANS_MNT 0x10
	193
	194	#define NUM_SMK_MNT_OPTS 5
	195
	196	enum {
	197	Opt_error = -1,
	198	Opt_fsdefault = 1,
	199	Opt_fsfloor = 2,
	200	Opt_fshat = 3,
	201	Opt_fsroot = 4,
	202	Opt_fstransmute = 5,
	203	};
	204
e114e473 CS	205	/*
	206	* Mount options
	207	*/
	208	#define SMK_FSDEFAULT "smackfsdef="
	209	#define SMK_FSFLOOR "smackfsfloor="
	210	#define SMK_FSHAT "smackfshat="
	211	#define SMK_FSROOT "smackfsroot="
e830b394	212	#define SMK_FSTRANS "smackfstransmute="
e114e473	213
21abb1ec	214	#define SMACK_DELETE_OPTION "-DELETE"
4303154e EB	215	#define SMACK_CIPSO_OPTION "-CIPSO"
4303154e EB	216
e114e473	217	/*
6d3dc07c CS	218	* How communications on this socket are treated.
	219	* Usually it's determined by the underlying netlabel code
	220	* but there are certain cases, including single label hosts
	221	* and potentially single label interfaces for which the
	222	* treatment can not be known in advance.
	223	*
	224	* The possibility of additional labeling schemes being
	225	* introduced in the future exists as well.
	226	*/
	227	#define SMACK_UNLABELED_SOCKET 0
	228	#define SMACK_CIPSO_SOCKET 1
	229
e114e473 CS	230	/*
	231	* CIPSO defaults.
	232	*/
	233	#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
6d3dc07c	234	#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
e114e473	235	#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
f7112e6c	236	#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
e114e473	237	#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
677264e8 CS	238	/*
	239	* CIPSO 2.2 standard is 239, but Smack wants to use the
	240	* categories in a structured way that limits the value to
	241	* the bits in 23 bytes, hence the unusual number.
	242	*/
	243	#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
e114e473	244
66867818 LP	245	/*
	246	* Ptrace rules
	247	*/
	248	#define SMACK_PTRACE_DEFAULT 0
	249	#define SMACK_PTRACE_EXACT 1
	250	#define SMACK_PTRACE_DRACONIAN 2
	251	#define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN
	252
5c6d1125	253	/*
c0ab6e56 CS	254	* Flags for untraditional access modes.
	255	* It shouldn't be necessary to avoid conflicts with definitions
	256	* in fs.h, but do so anyway.
5c6d1125	257	*/
c0ab6e56 CS	258	#define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
c0ab6e56 CS	259	#define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
d166c802	260	#define MAY_BRINGUP 0x00004000 /* Report use of this rule */
c0ab6e56	261
c60b9066 CS	262	/*
	263	* The policy for delivering signals is configurable.
	264	* It is usually "write", but can be "append".
	265	*/
	266	#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
	267	#define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */
	268	#else
	269	#define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */
	270	#endif
	271
bf4b2fee CS	272	#define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */
	273	#define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */
	274	#define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */
	275
e114e473 CS	276	/*
	277	* Just to make the common cases easier to deal with
	278	*/
e114e473	279	#define MAY_ANYREAD (MAY_READ \| MAY_EXEC)
e114e473 CS	280	#define MAY_READWRITE (MAY_READ \| MAY_WRITE)
	281	#define MAY_NOT 0
	282
ecfcc53f	283	/*
d166c802	284	* Number of access types used by Smack (rwxatlb)
ecfcc53f	285	*/
d166c802	286	#define SMK_NUM_ACCESS_TYPE 7
ecfcc53f	287
3b3b0e4f EP	288	/* SMACK data */
	289	struct smack_audit_data {
	290	const char *function;
	291	char *subject;
	292	char *object;
	293	char *request;
	294	int result;
	295	};
	296
ecfcc53f EB	297	/*
	298	* Smack audit data; is empty if CONFIG_AUDIT not set
	299	* to save some stack
	300	*/
	301	struct smk_audit_info {
	302	#ifdef CONFIG_AUDIT
	303	struct common_audit_data a;
3b3b0e4f	304	struct smack_audit_data sad;
ecfcc53f EB	305	#endif
ecfcc53f EB	306	};
e114e473 CS	307
	308	/*
	309	* These functions are in smack_access.c
	310	*/
7898e1f8	311	int smk_access_entry(char , char , struct list_head *);
21c7eae2 LP	312	int smk_access(struct smack_known , struct smack_known ,
	313	int, struct smk_audit_info *);
	314	int smk_tskacc(struct task_smack , struct smack_known ,
	315	u32, struct smk_audit_info *);
	316	int smk_curacc(struct smack_known , u32, struct smk_audit_info );
2f823ff8	317	struct smack_known *smack_from_secid(const u32);
f7112e6c CS	318	char smk_parse_smack(const char string, int len);
f7112e6c CS	319	int smk_netlbl_mls(int, char , struct netlbl_lsm_secattr , int);
e114e473	320	struct smack_known smk_import_entry(const char , int);
4d7cf4a1	321	void smk_insert_entry(struct smack_known *skp);
272cd7a8	322	struct smack_known smk_find_entry(const char );
f28e783f	323	bool smack_privileged(int cap);
38416e53	324	void smk_destroy_label_list(struct list_head *list);
e114e473 CS	325
	326	/*
	327	* Shared data.
	328	*/
69f287ae	329	extern int smack_enabled;
e114e473	330	extern int smack_cipso_direct;
f7112e6c	331	extern int smack_cipso_mapped;
2f823ff8	332	extern struct smack_known *smack_net_ambient;
00f84f3f	333	extern struct smack_known *smack_syslog_label;
bf4b2fee CS	334	#ifdef CONFIG_SECURITY_SMACK_BRINGUP
	335	extern struct smack_known *smack_unconfined;
	336	#endif
66867818	337	extern int smack_ptrace_rule;
e114e473	338
e114e473 CS	339	extern struct smack_known smack_known_floor;
	340	extern struct smack_known smack_known_hat;
	341	extern struct smack_known smack_known_huh;
e114e473	342	extern struct smack_known smack_known_star;
6d3dc07c	343	extern struct smack_known smack_known_web;
e114e473	344
f7112e6c	345	extern struct mutex smack_known_lock;
7198e2ee	346	extern struct list_head smack_known_list;
21abb1ec CS	347	extern struct list_head smk_net4addr_list;
	348	#if IS_ENABLED(CONFIG_IPV6)
	349	extern struct list_head smk_net6addr_list;
	350	#endif /* CONFIG_IPV6 */
7198e2ee	351
c0d77c88 RK	352	extern struct mutex smack_onlycap_lock;
	353	extern struct list_head smack_onlycap_list;
	354
4d7cf4a1 TS	355	#define SMACK_HASH_SLOTS 16
	356	extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
	357
5c6d1125 JS	358	/*
	359	* Is the directory transmuting?
	360	*/
	361	static inline int smk_inode_transmutable(const struct inode *isp)
	362	{
	363	struct inode_smack *sip = isp->i_security;
	364	return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
	365	}
	366
e114e473	367	/*
21c7eae2	368	* Present a pointer to the smack label entry in an inode blob.
e114e473	369	*/
21c7eae2	370	static inline struct smack_known smk_of_inode(const struct inode isp)
e114e473 CS	371	{
	372	struct inode_smack *sip = isp->i_security;
	373	return sip->smk_inode;
	374	}
	375
676dac4b	376	/*
2f823ff8	377	* Present a pointer to the smack label entry in an task blob.
676dac4b	378	*/
2f823ff8	379	static inline struct smack_known smk_of_task(const struct task_smack tsp)
676dac4b CS	380	{
	381	return tsp->smk_task;
	382	}
	383
6d1cff2a AR	384	static inline struct smack_known smk_of_task_struct(const struct task_struct t)
	385	{
	386	struct smack_known *skp;
	387
	388	rcu_read_lock();
	389	skp = smk_of_task(__task_cred(t)->security);
	390	rcu_read_unlock();
	391	return skp;
	392	}
	393
676dac4b	394	/*
2f823ff8	395	* Present a pointer to the forked smack label entry in an task blob.
676dac4b	396	*/
2f823ff8	397	static inline struct smack_known smk_of_forked(const struct task_smack tsp)
676dac4b CS	398	{
	399	return tsp->smk_forked;
	400	}
	401
	402	/*
5c6d1125	403	* Present a pointer to the smack label in the current task blob.
676dac4b	404	*/
2f823ff8	405	static inline struct smack_known *smk_of_current(void)
676dac4b CS	406	{
	407	return smk_of_task(current_security());
	408	}
	409
ecfcc53f EB	410	/*
	411	* logging functions
	412	*/
	413	#define SMACK_AUDIT_DENIED 0x1
	414	#define SMACK_AUDIT_ACCEPT 0x2
	415	extern int log_policy;
	416
	417	void smack_log(char subject_label, char object_label,
	418	int request,
	419	int result, struct smk_audit_info *auditdata);
	420
	421	#ifdef CONFIG_AUDIT
	422
	423	/*
	424	* some inline functions to set up audit data
	425	* they do nothing if CONFIG_AUDIT is not set
	426	*
	427	*/
	428	static inline void smk_ad_init(struct smk_audit_info a, const char func,
	429	char type)
	430	{
50c205f5	431	memset(&a->sad, 0, sizeof(a->sad));
ecfcc53f	432	a->a.type = type;
3b3b0e4f EP	433	a->a.smack_audit_data = &a->sad;
3b3b0e4f EP	434	a->a.smack_audit_data->function = func;
ecfcc53f EB	435	}
ecfcc53f EB	436
48c62af6 EP	437	static inline void smk_ad_init_net(struct smk_audit_info a, const char func,
	438	char type, struct lsm_network_audit *net)
	439	{
	440	smk_ad_init(a, func, type);
	441	memset(net, 0, sizeof(*net));
	442	a->a.u.net = net;
	443	}
	444
ecfcc53f EB	445	static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
	446	struct task_struct *t)
	447	{
	448	a->a.u.tsk = t;
	449	}
	450	static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
	451	struct dentry *d)
	452	{
a269434d	453	a->a.u.dentry = d;
ecfcc53f EB	454	}
	455	static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
	456	struct inode *i)
	457	{
f48b7399	458	a->a.u.inode = i;
ecfcc53f EB	459	}
	460	static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
	461	struct path p)
	462	{
f48b7399	463	a->a.u.path = p;
ecfcc53f EB	464	}
	465	static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
	466	struct sock *sk)
	467	{
48c62af6	468	a->a.u.net->sk = sk;
ecfcc53f EB	469	}
	470
	471	#else /* no AUDIT */
	472
	473	static inline void smk_ad_init(struct smk_audit_info a, const char func,
	474	char type)
	475	{
	476	}
	477	static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
	478	struct task_struct *t)
	479	{
	480	}
	481	static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
	482	struct dentry *d)
	483	{
	484	}
	485	static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
	486	struct vfsmount *m)
	487	{
	488	}
	489	static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
	490	struct inode *i)
	491	{
	492	}
	493	static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
	494	struct path p)
	495	{
	496	}
	497	static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
	498	struct sock *sk)
	499	{
	500	}
	501	#endif
	502
e114e473	503	#endif /* _SECURITY_SMACK_H */