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/*

 * 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 */

        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 */

        unsigned char primary;  /* primary name? */

};

/* User attributes */

struct user_datum {

        u32 value;                      /* internal user value */

        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;

        /* 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;

        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_ */