[mirror_ubuntu-artful-kernel.git] / security / selinux / ss / policydb.h

/*
 * A policy database (policydb) specifies the
 * configuration data for the security policy.
 *
 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
 */

/*
 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
 *
 *	Support for enhanced MLS infrastructure.
 *
 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
 *
 *	Added conditional policy language extensions
 *
 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
 *	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.
 */

#ifndef _SS_POLICYDB_H_
#define _SS_POLICYDB_H_

#include "symtab.h"
#include "avtab.h"
#include "sidtab.h"
#include "context.h"
#include "constraint.h"

/*
 * A datum type is defined for each kind of symbol
 * in the configuration data:  individual permissions,
 * common prefixes for access vectors, classes,
 * users, roles, types, sensitivities, categories, etc.
 */

/* Permission attributes */
struct perm_datum {
	u32 value;		/* permission bit + 1 */
};

/* Attributes of a common prefix for access vectors */
struct common_datum {
	u32 value;			/* internal common value */
	struct symtab permissions;	/* common permissions */
};

/* Class attributes */
struct class_datum {
	u32 value;			/* class value */
	char *comkey;			/* common name */
	struct common_datum *comdatum;	/* common datum */
	struct symtab permissions;	/* class-specific permission symbol table */
	struct constraint_node *constraints;	/* constraints on class permissions */
	struct constraint_node *validatetrans;	/* special transition rules */
};

/* Role attributes */
struct role_datum {
	u32 value;			/* internal role value */
	u32 bounds;			/* boundary of role */
	struct ebitmap dominates;	/* set of roles dominated by this role */
	struct ebitmap types;		/* set of authorized types for role */
};

struct role_trans {
	u32 role;		/* current role */
	u32 type;		/* program executable type */
	u32 new_role;		/* new role */
	struct role_trans *next;
};

struct role_allow {
	u32 role;		/* current role */
	u32 new_role;		/* new role */
	struct role_allow *next;
};

/* Type attributes */
struct type_datum {
	u32 value;		/* internal type value */
	u32 bounds;		/* boundary of type */
	unsigned char primary;	/* primary name? */
	unsigned char attribute;/* attribute ?*/
};

/* User attributes */
struct user_datum {
	u32 value;			/* internal user value */
	u32 bounds;			/* bounds of user */
	struct ebitmap roles;		/* set of authorized roles for user */
	struct mls_range range;		/* MLS range (min - max) for user */
	struct mls_level dfltlevel;	/* default login MLS level for user */
};


/* Sensitivity attributes */
struct level_datum {
	struct mls_level *level;	/* sensitivity and associated categories */
	unsigned char isalias;	/* is this sensitivity an alias for another? */
};

/* Category attributes */
struct cat_datum {
	u32 value;		/* internal category bit + 1 */
	unsigned char isalias;  /* is this category an alias for another? */
};

struct range_trans {
	u32 source_type;
	u32 target_type;
	u32 target_class;
	struct mls_range target_range;
	struct range_trans *next;
};

/* Boolean data type */
struct cond_bool_datum {
	__u32 value;		/* internal type value */
	int state;
};

struct cond_node;

/*
 * The configuration data includes security contexts for
 * initial SIDs, unlabeled file systems, TCP and UDP port numbers,
 * network interfaces, and nodes.  This structure stores the
 * relevant data for one such entry.  Entries of the same kind
 * (e.g. all initial SIDs) are linked together into a list.
 */
struct ocontext {
	union {
		char *name;	/* name of initial SID, fs, netif, fstype, path */
		struct {
			u8 protocol;
			u16 low_port;
			u16 high_port;
		} port;		/* TCP or UDP port information */
		struct {
			u32 addr;
			u32 mask;
		} node;		/* node information */
		struct {
			u32 addr[4];
			u32 mask[4];
		} node6;        /* IPv6 node information */
	} u;
	union {
		u32 sclass;  /* security class for genfs */
		u32 behavior;  /* labeling behavior for fs_use */
	} v;
	struct context context[2];	/* security context(s) */
	u32 sid[2];	/* SID(s) */
	struct ocontext *next;
};

struct genfs {
	char *fstype;
	struct ocontext *head;
	struct genfs *next;
};

/* symbol table array indices */
#define SYM_COMMONS 0
#define SYM_CLASSES 1
#define SYM_ROLES   2
#define SYM_TYPES   3
#define SYM_USERS   4
#define SYM_BOOLS   5
#define SYM_LEVELS  6
#define SYM_CATS    7
#define SYM_NUM     8

/* object context array indices */
#define OCON_ISID  0	/* initial SIDs */
#define OCON_FS    1	/* unlabeled file systems */
#define OCON_PORT  2	/* TCP and UDP port numbers */
#define OCON_NETIF 3	/* network interfaces */
#define OCON_NODE  4	/* nodes */
#define OCON_FSUSE 5	/* fs_use */
#define OCON_NODE6 6	/* IPv6 nodes */
#define OCON_NUM   7

/* The policy database */
struct policydb {
	/* symbol tables */
	struct symtab symtab[SYM_NUM];
#define p_commons symtab[SYM_COMMONS]
#define p_classes symtab[SYM_CLASSES]
#define p_roles symtab[SYM_ROLES]
#define p_types symtab[SYM_TYPES]
#define p_users symtab[SYM_USERS]
#define p_bools symtab[SYM_BOOLS]
#define p_levels symtab[SYM_LEVELS]
#define p_cats symtab[SYM_CATS]

	/* symbol names indexed by (value - 1) */
	char **sym_val_to_name[SYM_NUM];
#define p_common_val_to_name sym_val_to_name[SYM_COMMONS]
#define p_class_val_to_name sym_val_to_name[SYM_CLASSES]
#define p_role_val_to_name sym_val_to_name[SYM_ROLES]
#define p_type_val_to_name sym_val_to_name[SYM_TYPES]
#define p_user_val_to_name sym_val_to_name[SYM_USERS]
#define p_bool_val_to_name sym_val_to_name[SYM_BOOLS]
#define p_sens_val_to_name sym_val_to_name[SYM_LEVELS]
#define p_cat_val_to_name sym_val_to_name[SYM_CATS]

	/* class, role, and user attributes indexed by (value - 1) */
	struct class_datum **class_val_to_struct;
	struct role_datum **role_val_to_struct;
	struct user_datum **user_val_to_struct;
	struct type_datum **type_val_to_struct;

	/* type enforcement access vectors and transitions */
	struct avtab te_avtab;

	/* role transitions */
	struct role_trans *role_tr;

	/* bools indexed by (value - 1) */
	struct cond_bool_datum **bool_val_to_struct;
	/* type enforcement conditional access vectors and transitions */
	struct avtab te_cond_avtab;
	/* linked list indexing te_cond_avtab by conditional */
	struct cond_node *cond_list;

	/* role allows */
	struct role_allow *role_allow;

	/* security contexts of initial SIDs, unlabeled file systems,
	   TCP or UDP port numbers, network interfaces and nodes */
	struct ocontext *ocontexts[OCON_NUM];

	/* security contexts for files in filesystems that cannot support
	   a persistent label mapping or use another
	   fixed labeling behavior. */
	struct genfs *genfs;

	/* range transitions */
	struct range_trans *range_tr;

	/* type -> attribute reverse mapping */
	struct ebitmap *type_attr_map;

	struct ebitmap policycaps;

	struct ebitmap permissive_map;

	unsigned int policyvers;

	unsigned int reject_unknown : 1;
	unsigned int allow_unknown : 1;

	u16 process_class;
	u32 process_trans_perms;
};

extern void policydb_destroy(struct policydb *p);
extern int policydb_load_isids(struct policydb *p, struct sidtab *s);
extern int policydb_context_isvalid(struct policydb *p, struct context *c);
extern int policydb_class_isvalid(struct policydb *p, unsigned int class);
extern int policydb_type_isvalid(struct policydb *p, unsigned int type);
extern int policydb_role_isvalid(struct policydb *p, unsigned int role);
extern int policydb_read(struct policydb *p, void *fp);

#define PERM_SYMTAB_SIZE 32

#define POLICYDB_CONFIG_MLS    1

/* the config flags related to unknown classes/perms are bits 2 and 3 */
#define REJECT_UNKNOWN	0x00000002
#define ALLOW_UNKNOWN	0x00000004

#define OBJECT_R "object_r"
#define OBJECT_R_VAL 1

#define POLICYDB_MAGIC SELINUX_MAGIC
#define POLICYDB_STRING "SE Linux"

struct policy_file {
	char *data;
	size_t len;
};

static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes)
{
	if (bytes > fp->len)
		return -EINVAL;

	memcpy(buf, fp->data, bytes);
	fp->data += bytes;
	fp->len -= bytes;
	return 0;
}

extern u16 string_to_security_class(struct policydb *p, const char *name);
extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name);

#endif	/* _SS_POLICYDB_H_ */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* A policy database (policydb) specifies the
	3	* configuration data for the security policy.
	4	*
	5	* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
	6	*/
	7
	8	/*
	9	* Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
	10	*
	11	* Support for enhanced MLS infrastructure.
	12	*
	13	* Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
	14	*
489a5fd7	15	* Added conditional policy language extensions
1da177e4 LT	16	*
	17	* Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
	18	* Copyright (C) 2003 - 2004 Tresys Technology, LLC
	19	* This program is free software; you can redistribute it and/or modify
489a5fd7	20	* it under the terms of the GNU General Public License as published by
1da177e4 LT	21	* the Free Software Foundation, version 2.
	22	*/
	23
	24	#ifndef _SS_POLICYDB_H_
	25	#define _SS_POLICYDB_H_
	26
	27	#include "symtab.h"
	28	#include "avtab.h"
	29	#include "sidtab.h"
	30	#include "context.h"
	31	#include "constraint.h"
	32
	33	/*
	34	* A datum type is defined for each kind of symbol
	35	* in the configuration data: individual permissions,
	36	* common prefixes for access vectors, classes,
	37	* users, roles, types, sensitivities, categories, etc.
	38	*/
	39
	40	/* Permission attributes */
	41	struct perm_datum {
	42	u32 value; /* permission bit + 1 */
	43	};
	44
	45	/* Attributes of a common prefix for access vectors */
	46	struct common_datum {
	47	u32 value; /* internal common value */
	48	struct symtab permissions; /* common permissions */
	49	};
	50
	51	/* Class attributes */
	52	struct class_datum {
	53	u32 value; /* class value */
	54	char comkey; / common name */
	55	struct common_datum comdatum; / common datum */
	56	struct symtab permissions; /* class-specific permission symbol table */
	57	struct constraint_node constraints; / constraints on class permissions */
	58	struct constraint_node validatetrans; / special transition rules */
	59	};
	60
	61	/* Role attributes */
	62	struct role_datum {
	63	u32 value; /* internal role value */
d9250dea	64	u32 bounds; /* boundary of role */
1da177e4 LT	65	struct ebitmap dominates; /* set of roles dominated by this role */
	66	struct ebitmap types; /* set of authorized types for role */
	67	};
	68
	69	struct role_trans {
	70	u32 role; /* current role */
	71	u32 type; /* program executable type */
	72	u32 new_role; /* new role */
	73	struct role_trans *next;
	74	};
	75
	76	struct role_allow {
	77	u32 role; /* current role */
	78	u32 new_role; /* new role */
	79	struct role_allow *next;
	80	};
	81
	82	/* Type attributes */
	83	struct type_datum {
	84	u32 value; /* internal type value */
d9250dea	85	u32 bounds; /* boundary of type */
1da177e4	86	unsigned char primary; /* primary name? */
d9250dea	87	unsigned char attribute;/* attribute ?*/
1da177e4 LT	88	};
	89
	90	/* User attributes */
	91	struct user_datum {
	92	u32 value; /* internal user value */
d9250dea	93	u32 bounds; /* bounds of user */
1da177e4 LT	94	struct ebitmap roles; /* set of authorized roles for user */
	95	struct mls_range range; /* MLS range (min - max) for user */
	96	struct mls_level dfltlevel; /* default login MLS level for user */
	97	};
	98
	99
	100	/* Sensitivity attributes */
	101	struct level_datum {
	102	struct mls_level level; / sensitivity and associated categories */
	103	unsigned char isalias; /* is this sensitivity an alias for another? */
	104	};
	105
	106	/* Category attributes */
	107	struct cat_datum {
	108	u32 value; /* internal category bit + 1 */
	109	unsigned char isalias; /* is this category an alias for another? */
	110	};
	111
	112	struct range_trans {
f3f87714 DG	113	u32 source_type;
	114	u32 target_type;
	115	u32 target_class;
	116	struct mls_range target_range;
1da177e4 LT	117	struct range_trans *next;
	118	};
	119
	120	/* Boolean data type */
	121	struct cond_bool_datum {
	122	__u32 value; /* internal type value */
	123	int state;
	124	};
	125
	126	struct cond_node;
	127
	128	/*
	129	* The configuration data includes security contexts for
	130	* initial SIDs, unlabeled file systems, TCP and UDP port numbers,
	131	* network interfaces, and nodes. This structure stores the
	132	* relevant data for one such entry. Entries of the same kind
	133	* (e.g. all initial SIDs) are linked together into a list.
	134	*/
	135	struct ocontext {
	136	union {
	137	char name; / name of initial SID, fs, netif, fstype, path */
	138	struct {
	139	u8 protocol;
	140	u16 low_port;
	141	u16 high_port;
	142	} port; /* TCP or UDP port information */
	143	struct {
	144	u32 addr;
	145	u32 mask;
	146	} node; /* node information */
	147	struct {
	148	u32 addr[4];
	149	u32 mask[4];
	150	} node6; /* IPv6 node information */
	151	} u;
	152	union {
	153	u32 sclass; /* security class for genfs */
	154	u32 behavior; /* labeling behavior for fs_use */
	155	} v;
	156	struct context context[2]; /* security context(s) */
	157	u32 sid[2]; /* SID(s) */
	158	struct ocontext *next;
	159	};
	160
	161	struct genfs {
	162	char *fstype;
	163	struct ocontext *head;
	164	struct genfs *next;
	165	};
	166
	167	/* symbol table array indices */
	168	#define SYM_COMMONS 0
	169	#define SYM_CLASSES 1
	170	#define SYM_ROLES 2
	171	#define SYM_TYPES 3
	172	#define SYM_USERS 4
	173	#define SYM_BOOLS 5
	174	#define SYM_LEVELS 6
	175	#define SYM_CATS 7
	176	#define SYM_NUM 8
	177
	178	/* object context array indices */
	179	#define OCON_ISID 0 /* initial SIDs */
	180	#define OCON_FS 1 /* unlabeled file systems */
181	#define OCON_PORT 2 /* TCP and UDP port numbers */
182	#define OCON_NETIF 3 /* network interfaces */
183	#define OCON_NODE 4 /* nodes */
184	#define OCON_FSUSE 5 /* fs_use */
185	#define OCON_NODE6 6 /* IPv6 nodes */
186	#define OCON_NUM 7
187
188	/* The policy database */
189	struct policydb {
190	/* symbol tables */
191	struct symtab symtab[SYM_NUM];
192	#define p_commons symtab[SYM_COMMONS]
193	#define p_classes symtab[SYM_CLASSES]
194	#define p_roles symtab[SYM_ROLES]
195	#define p_types symtab[SYM_TYPES]
196	#define p_users symtab[SYM_USERS]
197	#define p_bools symtab[SYM_BOOLS]
198	#define p_levels symtab[SYM_LEVELS]
199	#define p_cats symtab[SYM_CATS]
200
201	/* symbol names indexed by (value - 1) */
202	char **sym_val_to_name[SYM_NUM];
203	#define p_common_val_to_name sym_val_to_name[SYM_COMMONS]
204	#define p_class_val_to_name sym_val_to_name[SYM_CLASSES]
205	#define p_role_val_to_name sym_val_to_name[SYM_ROLES]
206	#define p_type_val_to_name sym_val_to_name[SYM_TYPES]
207	#define p_user_val_to_name sym_val_to_name[SYM_USERS]
208	#define p_bool_val_to_name sym_val_to_name[SYM_BOOLS]
209	#define p_sens_val_to_name sym_val_to_name[SYM_LEVELS]
210	#define p_cat_val_to_name sym_val_to_name[SYM_CATS]
211
212	/* class, role, and user attributes indexed by (value - 1) */
213	struct class_datum **class_val_to_struct;
214	struct role_datum **role_val_to_struct;
215	struct user_datum **user_val_to_struct;
d9250dea	216	struct type_datum **type_val_to_struct;
1da177e4 LT	217
	218	/* type enforcement access vectors and transitions */
	219	struct avtab te_avtab;
	220
	221	/* role transitions */
	222	struct role_trans *role_tr;
	223
	224	/* bools indexed by (value - 1) */
	225	struct cond_bool_datum **bool_val_to_struct;
	226	/* type enforcement conditional access vectors and transitions */
	227	struct avtab te_cond_avtab;
	228	/* linked list indexing te_cond_avtab by conditional */
489a5fd7	229	struct cond_node *cond_list;
1da177e4 LT	230
	231	/* role allows */
	232	struct role_allow *role_allow;
	233
	234	/* security contexts of initial SIDs, unlabeled file systems,
	235	TCP or UDP port numbers, network interfaces and nodes */
	236	struct ocontext *ocontexts[OCON_NUM];
	237
489a5fd7	238	/* security contexts for files in filesystems that cannot support
1da177e4 LT	239	a persistent label mapping or use another
1da177e4 LT	240	fixed labeling behavior. */
489a5fd7	241	struct genfs *genfs;
1da177e4 LT	242
	243	/* range transitions */
	244	struct range_trans *range_tr;
	245
782ebb99 SS	246	/* type -> attribute reverse mapping */
	247	struct ebitmap *type_attr_map;
	248
3bb56b25 PM	249	struct ebitmap policycaps;
3bb56b25 PM	250
64dbf074 EP	251	struct ebitmap permissive_map;
64dbf074 EP	252
1da177e4	253	unsigned int policyvers;
3f12070e EP	254
	255	unsigned int reject_unknown : 1;
	256	unsigned int allow_unknown : 1;
c6d3aaa4 SS	257
	258	u16 process_class;
	259	u32 process_trans_perms;
1da177e4 LT	260	};
	261
	262	extern void policydb_destroy(struct policydb *p);
	263	extern int policydb_load_isids(struct policydb p, struct sidtab s);
	264	extern int policydb_context_isvalid(struct policydb p, struct context c);
45e5421e SS	265	extern int policydb_class_isvalid(struct policydb *p, unsigned int class);
	266	extern int policydb_type_isvalid(struct policydb *p, unsigned int type);
	267	extern int policydb_role_isvalid(struct policydb *p, unsigned int role);
1da177e4 LT	268	extern int policydb_read(struct policydb p, void fp);
	269
	270	#define PERM_SYMTAB_SIZE 32
	271
	272	#define POLICYDB_CONFIG_MLS 1
	273
3f12070e EP	274	/* the config flags related to unknown classes/perms are bits 2 and 3 */
	275	#define REJECT_UNKNOWN 0x00000002
	276	#define ALLOW_UNKNOWN 0x00000004
	277
1da177e4 LT	278	#define OBJECT_R "object_r"
	279	#define OBJECT_R_VAL 1
	280
	281	#define POLICYDB_MAGIC SELINUX_MAGIC
	282	#define POLICYDB_STRING "SE Linux"
	283
	284	struct policy_file {
	285	char *data;
	286	size_t len;
	287	};
	288
	289	static inline int next_entry(void buf, struct policy_file fp, size_t bytes)
	290	{
	291	if (bytes > fp->len)
	292	return -EINVAL;
	293
	294	memcpy(buf, fp->data, bytes);
	295	fp->data += bytes;
	296	fp->len -= bytes;
	297	return 0;
	298	}
	299
c6d3aaa4 SS	300	extern u16 string_to_security_class(struct policydb p, const char name);
	301	extern u32 string_to_av_perm(struct policydb p, u16 tclass, const char name);
	302
1da177e4 LT	303	#endif /* _SS_POLICYDB_H_ */
1da177e4 LT	304