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389 lines
10 KiB
389 lines
10 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* A policy database (policydb) specifies the |
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* configuration data for the security policy. |
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* |
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* Author : Stephen Smalley, <[email protected]> |
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*/ |
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/* |
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* Updated: Trusted Computer Solutions, Inc. <[email protected]> |
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* |
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* Support for enhanced MLS infrastructure. |
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* |
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* Updated: Frank Mayer <[email protected]> and Karl MacMillan <[email protected]> |
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* |
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* Added conditional policy language extensions |
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* |
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* Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. |
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* Copyright (C) 2003 - 2004 Tresys Technology, LLC |
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*/ |
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#ifndef _SS_POLICYDB_H_ |
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#define _SS_POLICYDB_H_ |
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#include "symtab.h" |
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#include "avtab.h" |
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#include "sidtab.h" |
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#include "ebitmap.h" |
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#include "mls_types.h" |
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#include "context.h" |
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#include "constraint.h" |
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/* |
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* A datum type is defined for each kind of symbol |
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* in the configuration data: individual permissions, |
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* common prefixes for access vectors, classes, |
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* users, roles, types, sensitivities, categories, etc. |
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*/ |
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/* Permission attributes */ |
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struct perm_datum { |
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u32 value; /* permission bit + 1 */ |
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}; |
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/* Attributes of a common prefix for access vectors */ |
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struct common_datum { |
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u32 value; /* internal common value */ |
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struct symtab permissions; /* common permissions */ |
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}; |
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/* Class attributes */ |
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struct class_datum { |
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u32 value; /* class value */ |
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char *comkey; /* common name */ |
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struct common_datum *comdatum; /* common datum */ |
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struct symtab permissions; /* class-specific permission symbol table */ |
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struct constraint_node *constraints; /* constraints on class permissions */ |
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struct constraint_node *validatetrans; /* special transition rules */ |
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/* Options how a new object user, role, and type should be decided */ |
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#define DEFAULT_SOURCE 1 |
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#define DEFAULT_TARGET 2 |
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char default_user; |
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char default_role; |
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char default_type; |
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/* Options how a new object range should be decided */ |
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#define DEFAULT_SOURCE_LOW 1 |
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#define DEFAULT_SOURCE_HIGH 2 |
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#define DEFAULT_SOURCE_LOW_HIGH 3 |
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#define DEFAULT_TARGET_LOW 4 |
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#define DEFAULT_TARGET_HIGH 5 |
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#define DEFAULT_TARGET_LOW_HIGH 6 |
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#define DEFAULT_GLBLUB 7 |
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char default_range; |
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}; |
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/* Role attributes */ |
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struct role_datum { |
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u32 value; /* internal role value */ |
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u32 bounds; /* boundary of role */ |
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struct ebitmap dominates; /* set of roles dominated by this role */ |
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struct ebitmap types; /* set of authorized types for role */ |
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}; |
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struct role_trans_key { |
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u32 role; /* current role */ |
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u32 type; /* program executable type, or new object type */ |
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u32 tclass; /* process class, or new object class */ |
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}; |
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struct role_trans_datum { |
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u32 new_role; /* new role */ |
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}; |
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struct filename_trans_key { |
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u32 ttype; /* parent dir context */ |
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u16 tclass; /* class of new object */ |
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const char *name; /* last path component */ |
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}; |
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struct filename_trans_datum { |
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struct ebitmap stypes; /* bitmap of source types for this otype */ |
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u32 otype; /* resulting type of new object */ |
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struct filename_trans_datum *next; /* record for next otype*/ |
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}; |
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struct role_allow { |
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u32 role; /* current role */ |
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u32 new_role; /* new role */ |
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struct role_allow *next; |
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}; |
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/* Type attributes */ |
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struct type_datum { |
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u32 value; /* internal type value */ |
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u32 bounds; /* boundary of type */ |
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unsigned char primary; /* primary name? */ |
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unsigned char attribute;/* attribute ?*/ |
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}; |
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/* User attributes */ |
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struct user_datum { |
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u32 value; /* internal user value */ |
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u32 bounds; /* bounds of user */ |
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struct ebitmap roles; /* set of authorized roles for user */ |
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struct mls_range range; /* MLS range (min - max) for user */ |
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struct mls_level dfltlevel; /* default login MLS level for user */ |
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}; |
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/* Sensitivity attributes */ |
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struct level_datum { |
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struct mls_level *level; /* sensitivity and associated categories */ |
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unsigned char isalias; /* is this sensitivity an alias for another? */ |
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}; |
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/* Category attributes */ |
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struct cat_datum { |
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u32 value; /* internal category bit + 1 */ |
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unsigned char isalias; /* is this category an alias for another? */ |
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}; |
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struct range_trans { |
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u32 source_type; |
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u32 target_type; |
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u32 target_class; |
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}; |
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/* Boolean data type */ |
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struct cond_bool_datum { |
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__u32 value; /* internal type value */ |
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int state; |
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}; |
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struct cond_node; |
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/* |
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* type set preserves data needed to determine constraint info from |
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* policy source. This is not used by the kernel policy but allows |
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* utilities such as audit2allow to determine constraint denials. |
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*/ |
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struct type_set { |
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struct ebitmap types; |
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struct ebitmap negset; |
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u32 flags; |
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}; |
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/* |
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* The configuration data includes security contexts for |
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* initial SIDs, unlabeled file systems, TCP and UDP port numbers, |
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* network interfaces, and nodes. This structure stores the |
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* relevant data for one such entry. Entries of the same kind |
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* (e.g. all initial SIDs) are linked together into a list. |
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*/ |
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struct ocontext { |
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union { |
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char *name; /* name of initial SID, fs, netif, fstype, path */ |
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struct { |
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u8 protocol; |
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u16 low_port; |
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u16 high_port; |
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} port; /* TCP or UDP port information */ |
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struct { |
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u32 addr; |
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u32 mask; |
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} node; /* node information */ |
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struct { |
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u32 addr[4]; |
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u32 mask[4]; |
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} node6; /* IPv6 node information */ |
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struct { |
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u64 subnet_prefix; |
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u16 low_pkey; |
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u16 high_pkey; |
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} ibpkey; |
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struct { |
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char *dev_name; |
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u8 port; |
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} ibendport; |
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} u; |
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union { |
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u32 sclass; /* security class for genfs */ |
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u32 behavior; /* labeling behavior for fs_use */ |
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} v; |
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struct context context[2]; /* security context(s) */ |
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u32 sid[2]; /* SID(s) */ |
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struct ocontext *next; |
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}; |
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struct genfs { |
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char *fstype; |
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struct ocontext *head; |
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struct genfs *next; |
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}; |
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/* symbol table array indices */ |
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#define SYM_COMMONS 0 |
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#define SYM_CLASSES 1 |
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#define SYM_ROLES 2 |
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#define SYM_TYPES 3 |
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#define SYM_USERS 4 |
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#define SYM_BOOLS 5 |
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#define SYM_LEVELS 6 |
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#define SYM_CATS 7 |
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#define SYM_NUM 8 |
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/* object context array indices */ |
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#define OCON_ISID 0 /* initial SIDs */ |
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#define OCON_FS 1 /* unlabeled file systems */ |
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#define OCON_PORT 2 /* TCP and UDP port numbers */ |
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#define OCON_NETIF 3 /* network interfaces */ |
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#define OCON_NODE 4 /* nodes */ |
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#define OCON_FSUSE 5 /* fs_use */ |
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#define OCON_NODE6 6 /* IPv6 nodes */ |
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#define OCON_IBPKEY 7 /* Infiniband PKeys */ |
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#define OCON_IBENDPORT 8 /* Infiniband end ports */ |
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#define OCON_NUM 9 |
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/* The policy database */ |
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struct policydb { |
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int mls_enabled; |
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/* symbol tables */ |
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struct symtab symtab[SYM_NUM]; |
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#define p_commons symtab[SYM_COMMONS] |
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#define p_classes symtab[SYM_CLASSES] |
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#define p_roles symtab[SYM_ROLES] |
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#define p_types symtab[SYM_TYPES] |
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#define p_users symtab[SYM_USERS] |
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#define p_bools symtab[SYM_BOOLS] |
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#define p_levels symtab[SYM_LEVELS] |
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#define p_cats symtab[SYM_CATS] |
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/* symbol names indexed by (value - 1) */ |
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char **sym_val_to_name[SYM_NUM]; |
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/* class, role, and user attributes indexed by (value - 1) */ |
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struct class_datum **class_val_to_struct; |
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struct role_datum **role_val_to_struct; |
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struct user_datum **user_val_to_struct; |
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struct type_datum **type_val_to_struct; |
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/* type enforcement access vectors and transitions */ |
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struct avtab te_avtab; |
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/* role transitions */ |
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struct hashtab role_tr; |
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/* file transitions with the last path component */ |
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/* quickly exclude lookups when parent ttype has no rules */ |
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struct ebitmap filename_trans_ttypes; |
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/* actual set of filename_trans rules */ |
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struct hashtab filename_trans; |
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/* only used if policyvers < POLICYDB_VERSION_COMP_FTRANS */ |
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u32 compat_filename_trans_count; |
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/* bools indexed by (value - 1) */ |
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struct cond_bool_datum **bool_val_to_struct; |
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/* type enforcement conditional access vectors and transitions */ |
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struct avtab te_cond_avtab; |
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/* array indexing te_cond_avtab by conditional */ |
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struct cond_node *cond_list; |
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u32 cond_list_len; |
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/* role allows */ |
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struct role_allow *role_allow; |
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/* security contexts of initial SIDs, unlabeled file systems, |
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TCP or UDP port numbers, network interfaces and nodes */ |
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struct ocontext *ocontexts[OCON_NUM]; |
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/* security contexts for files in filesystems that cannot support |
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a persistent label mapping or use another |
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fixed labeling behavior. */ |
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struct genfs *genfs; |
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/* range transitions table (range_trans_key -> mls_range) */ |
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struct hashtab range_tr; |
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/* type -> attribute reverse mapping */ |
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struct ebitmap *type_attr_map_array; |
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struct ebitmap policycaps; |
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struct ebitmap permissive_map; |
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/* length of this policy when it was loaded */ |
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size_t len; |
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unsigned int policyvers; |
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unsigned int reject_unknown : 1; |
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unsigned int allow_unknown : 1; |
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u16 process_class; |
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u32 process_trans_perms; |
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} __randomize_layout; |
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extern void policydb_destroy(struct policydb *p); |
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extern int policydb_load_isids(struct policydb *p, struct sidtab *s); |
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extern int policydb_context_isvalid(struct policydb *p, struct context *c); |
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extern int policydb_class_isvalid(struct policydb *p, unsigned int class); |
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extern int policydb_type_isvalid(struct policydb *p, unsigned int type); |
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extern int policydb_role_isvalid(struct policydb *p, unsigned int role); |
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extern int policydb_read(struct policydb *p, void *fp); |
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extern int policydb_write(struct policydb *p, void *fp); |
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extern struct filename_trans_datum *policydb_filenametr_search( |
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struct policydb *p, struct filename_trans_key *key); |
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extern struct mls_range *policydb_rangetr_search( |
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struct policydb *p, struct range_trans *key); |
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extern struct role_trans_datum *policydb_roletr_search( |
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struct policydb *p, struct role_trans_key *key); |
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#define POLICYDB_CONFIG_MLS 1 |
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/* the config flags related to unknown classes/perms are bits 2 and 3 */ |
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#define REJECT_UNKNOWN 0x00000002 |
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#define ALLOW_UNKNOWN 0x00000004 |
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#define OBJECT_R "object_r" |
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#define OBJECT_R_VAL 1 |
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#define POLICYDB_MAGIC SELINUX_MAGIC |
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#define POLICYDB_STRING "SE Linux" |
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struct policy_file { |
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char *data; |
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size_t len; |
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}; |
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struct policy_data { |
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struct policydb *p; |
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void *fp; |
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}; |
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static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes) |
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{ |
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if (bytes > fp->len) |
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return -EINVAL; |
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memcpy(buf, fp->data, bytes); |
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fp->data += bytes; |
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fp->len -= bytes; |
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return 0; |
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} |
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static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp) |
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{ |
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size_t len = bytes * num; |
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memcpy(fp->data, buf, len); |
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fp->data += len; |
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fp->len -= len; |
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return 0; |
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} |
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static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr) |
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{ |
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return p->sym_val_to_name[sym_num][element_nr]; |
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} |
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extern u16 string_to_security_class(struct policydb *p, const char *name); |
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extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name); |
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#endif /* _SS_POLICYDB_H_ */ |
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