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

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * A policy database (policydb) specifies the
  * configuration data for the security policy.
  *
  * Author : Stephen Smalley, <sds@tycho.nsa.gov>
  */

 /*
  * 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
  */

 #ifndef _SS_POLICYDB_H_
 #define _SS_POLICYDB_H_

 #include "symtab.h"
 #include "avtab.h"
 #include "sidtab.h"
 #include "ebitmap.h"
 #include "mls_types.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 */
 /* Options how a new object user, role, and type should be decided */
 #define DEFAULT_SOURCE         1
 #define DEFAULT_TARGET         2
 	char default_user;
 	char default_role;
 	char default_type;
 /* Options how a new object range should be decided */
 #define DEFAULT_SOURCE_LOW     1
 #define DEFAULT_SOURCE_HIGH    2
 #define DEFAULT_SOURCE_LOW_HIGH        3
 #define DEFAULT_TARGET_LOW     4
 #define DEFAULT_TARGET_HIGH    5
 #define DEFAULT_TARGET_LOW_HIGH        6
 #define DEFAULT_GLBLUB		7
 	char default_range;
 };

 /* 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_key {
 	u32 role;		/* current role */
 	u32 type;		/* program executable type, or new object type */
 	u32 tclass;		/* process class, or new object class */
 };

 struct role_trans_datum {
 	u32 new_role;		/* new role */
 };

 struct filename_trans_key {
 	u32 ttype;		/* parent dir context */
 	u16 tclass;		/* class of new object */
 	const char *name;	/* last path component */
 };

 struct filename_trans_datum {
 	struct ebitmap stypes;	/* bitmap of source types for this otype */
 	u32 otype;		/* resulting type of new object */
 	struct filename_trans_datum *next;	/* record for next otype*/
 };

 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;
 };

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

 struct cond_node;

 /*
  * type set preserves data needed to determine constraint info from
  * policy source. This is not used by the kernel policy but allows
  * utilities such as audit2allow to determine constraint denials.
  */
 struct type_set {
 	struct ebitmap types;
 	struct ebitmap negset;
 	u32 flags;
 };

 /*
  * 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 */
 		struct {
 			u64 subnet_prefix;
 			u16 low_pkey;
 			u16 high_pkey;
 		} ibpkey;
 		struct {
 			char *dev_name;
 			u8 port;
 		} ibendport;
 	} 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_IBPKEY	7 /* Infiniband PKeys */
 #define OCON_IBENDPORT	8 /* Infiniband end ports */
 #define OCON_NUM	9

 /* The policy database */
 struct policydb {
 	int mls_enabled;

 	/* 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];

 	/* 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 hashtab role_tr;

 	/* file transitions with the last path component */
 	/* quickly exclude lookups when parent ttype has no rules */
 	struct ebitmap filename_trans_ttypes;
 	/* actual set of filename_trans rules */
 	struct hashtab filename_trans;
 	/* only used if policyvers < POLICYDB_VERSION_COMP_FTRANS */
 	u32 compat_filename_trans_count;

 	/* 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;
 	/* array indexing te_cond_avtab by conditional */
 	struct cond_node *cond_list;
 	u32 cond_list_len;

 	/* 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 table (range_trans_key -> mls_range) */
 	struct hashtab range_tr;

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

 	struct ebitmap policycaps;

 	struct ebitmap permissive_map;

 	/* length of this policy when it was loaded */
 	size_t len;

 	unsigned int policyvers;

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

 	u16 process_class;
 	u32 process_trans_perms;
 } __randomize_layout;

 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);
 extern int policydb_write(struct policydb *p, void *fp);

 extern struct filename_trans_datum *policydb_filenametr_search(
 	struct policydb *p, struct filename_trans_key *key);

 extern struct mls_range *policydb_rangetr_search(
 	struct policydb *p, struct range_trans *key);

 extern struct role_trans_datum *policydb_roletr_search(
 	struct policydb *p, struct role_trans_key *key);

 #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;
 };

 struct policy_data {
 	struct policydb *p;
 	void *fp;
 };

 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;
 }

 static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp)
 {
 	size_t len = bytes * num;

 	if (len > fp->len)
 		return -EINVAL;
 	memcpy(fp->data, buf, len);
 	fp->data += len;
 	fp->len -= len;

 	return 0;
 }

 static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr)
 {
 	return p->sym_val_to_name[sym_num][element_nr];
 }

 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_ */
	/* SPDX-License-Identifier: GPL-2.0-only */
	/*
	* A policy database (policydb) specifies the
	* configuration data for the security policy.
	*
	* Author : Stephen Smalley, <sds@tycho.nsa.gov>
	*/

	/*
	* 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
	*/

	#ifndef _SS_POLICYDB_H_
	#define _SS_POLICYDB_H_

	#include "symtab.h"
	#include "avtab.h"
	#include "sidtab.h"
	#include "ebitmap.h"
	#include "mls_types.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 */
	/* Options how a new object user, role, and type should be decided */
	#define DEFAULT_SOURCE 1
	#define DEFAULT_TARGET 2
	char default_user;
	char default_role;
	char default_type;
	/* Options how a new object range should be decided */
	#define DEFAULT_SOURCE_LOW 1
	#define DEFAULT_SOURCE_HIGH 2
	#define DEFAULT_SOURCE_LOW_HIGH 3
	#define DEFAULT_TARGET_LOW 4
	#define DEFAULT_TARGET_HIGH 5
	#define DEFAULT_TARGET_LOW_HIGH 6
	#define DEFAULT_GLBLUB 7
	char default_range;
	};

	/* 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_key {
	u32 role; /* current role */
	u32 type; /* program executable type, or new object type */
	u32 tclass; /* process class, or new object class */
	};

	struct role_trans_datum {
	u32 new_role; /* new role */
	};

	struct filename_trans_key {
	u32 ttype; /* parent dir context */
	u16 tclass; /* class of new object */
	const char name; / last path component */
	};

	struct filename_trans_datum {
	struct ebitmap stypes; /* bitmap of source types for this otype */
	u32 otype; /* resulting type of new object */
	struct filename_trans_datum next; / record for next otype*/
	};

	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;
	};

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

	struct cond_node;

	/*
	* type set preserves data needed to determine constraint info from
	* policy source. This is not used by the kernel policy but allows
	* utilities such as audit2allow to determine constraint denials.
	*/
	struct type_set {
	struct ebitmap types;
	struct ebitmap negset;
	u32 flags;
	};

	/*
	* 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 */
	struct {
	u64 subnet_prefix;
	u16 low_pkey;
	u16 high_pkey;
	} ibpkey;
	struct {
	char *dev_name;
	u8 port;
	} ibendport;
	} 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_IBPKEY 7 /* Infiniband PKeys */
	#define OCON_IBENDPORT 8 /* Infiniband end ports */
	#define OCON_NUM 9

	/* The policy database */
	struct policydb {
	int mls_enabled;

	/* 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];

	/* 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 hashtab role_tr;

	/* file transitions with the last path component */
	/* quickly exclude lookups when parent ttype has no rules */
	struct ebitmap filename_trans_ttypes;
	/* actual set of filename_trans rules */
	struct hashtab filename_trans;
	/* only used if policyvers < POLICYDB_VERSION_COMP_FTRANS */
	u32 compat_filename_trans_count;

	/* 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;
	/* array indexing te_cond_avtab by conditional */
	struct cond_node *cond_list;
	u32 cond_list_len;

	/* 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 table (range_trans_key -> mls_range) */
	struct hashtab range_tr;

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

	struct ebitmap policycaps;

	struct ebitmap permissive_map;

	/* length of this policy when it was loaded */
	size_t len;

	unsigned int policyvers;

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

	u16 process_class;
	u32 process_trans_perms;
	} __randomize_layout;

	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);
	extern int policydb_write(struct policydb p, void fp);

	extern struct filename_trans_datum *policydb_filenametr_search(
	struct policydb p, struct filename_trans_key key);

	extern struct mls_range *policydb_rangetr_search(
	struct policydb p, struct range_trans key);

	extern struct role_trans_datum *policydb_roletr_search(
	struct policydb p, struct role_trans_key key);

	#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;
	};

	struct policy_data {
	struct policydb *p;
	void *fp;
	};

	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;
	}

	static inline int put_entry(const void buf, size_t bytes, int num, struct policy_file fp)
	{
	size_t len = bytes * num;

	if (len > fp->len)
	return -EINVAL;
	memcpy(fp->data, buf, len);
	fp->data += len;
	fp->len -= len;

	return 0;
	}

	static inline char sym_name(struct policydb p, unsigned int sym_num, unsigned int element_nr)
	{
	return p->sym_val_to_name[sym_num][element_nr];
	}

	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_ */