security/selinux/ss/policydb.h - kernel/common - Git at Google

 /*
  * A policy database (policydb) specifies the
  * configuration data for the security policy.
  *
  * Author : Stephen Smalley, <[email protected]>
  */

 /*
  * Updated: Trusted Computer Solutions, Inc. <[email protected]>
  *
  *	Support for enhanced MLS infrastructure.
  *
  * Updated: Frank Mayer <[email protected]> and Karl MacMillan <[email protected]>
  *
  *	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;
 	u32 *undefined_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;
 }

 #endif	/* _SS_POLICYDB_H_ */
	/*
	* A policy database (policydb) specifies the
	* configuration data for the security policy.
	*
	* Author : Stephen Smalley, <[email protected]>
	*/

	/*
	* Updated: Trusted Computer Solutions, Inc. <[email protected]>
	*
	* Support for enhanced MLS infrastructure.
	*
	* Updated: Frank Mayer <[email protected]> and Karl MacMillan <[email protected]>
	*
	* 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;
	u32 *undefined_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;
	}

	#endif /* _SS_POLICYDB_H_ */