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Diffstat (limited to 'security/selinux/ss/avtab.h')
| -rw-r--r-- | security/selinux/ss/avtab.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/security/selinux/ss/avtab.h b/security/selinux/ss/avtab.h new file mode 100644 index 000000000..d3ebea8d1 --- /dev/null +++ b/security/selinux/ss/avtab.h @@ -0,0 +1,120 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * An access vector table (avtab) is a hash table + * of access vectors and transition types indexed + * by a type pair and a class. An access vector + * table is used to represent the type enforcement + * tables. + * + * Author : Stephen Smalley, <sds@tycho.nsa.gov> + */ + +/* Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> + * + * Added conditional policy language extensions + * + * Copyright (C) 2003 Tresys Technology, LLC + * + * Updated: Yuichi Nakamura <ynakam@hitachisoft.jp> + * Tuned number of hash slots for avtab to reduce memory usage + */ +#ifndef _SS_AVTAB_H_ +#define _SS_AVTAB_H_ + +#include "security.h" + +struct avtab_key { + u16 source_type; /* source type */ + u16 target_type; /* target type */ + u16 target_class; /* target object class */ +#define AVTAB_ALLOWED 0x0001 +#define AVTAB_AUDITALLOW 0x0002 +#define AVTAB_AUDITDENY 0x0004 +#define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY) +#define AVTAB_TRANSITION 0x0010 +#define AVTAB_MEMBER 0x0020 +#define AVTAB_CHANGE 0x0040 +#define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE) +/* extended permissions */ +#define AVTAB_XPERMS_ALLOWED 0x0100 +#define AVTAB_XPERMS_AUDITALLOW 0x0200 +#define AVTAB_XPERMS_DONTAUDIT 0x0400 +#define AVTAB_XPERMS (AVTAB_XPERMS_ALLOWED | \ + AVTAB_XPERMS_AUDITALLOW | \ + AVTAB_XPERMS_DONTAUDIT) +#define AVTAB_ENABLED_OLD 0x80000000 /* reserved for used in cond_avtab */ +#define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */ + u16 specified; /* what field is specified */ +}; + +/* + * For operations that require more than the 32 permissions provided by the avc + * extended permissions may be used to provide 256 bits of permissions. + */ +struct avtab_extended_perms { +/* These are not flags. All 256 values may be used */ +#define AVTAB_XPERMS_IOCTLFUNCTION 0x01 +#define AVTAB_XPERMS_IOCTLDRIVER 0x02 + /* extension of the avtab_key specified */ + u8 specified; /* ioctl, netfilter, ... */ + /* + * if 256 bits is not adequate as is often the case with ioctls, then + * multiple extended perms may be used and the driver field + * specifies which permissions are included. + */ + u8 driver; + /* 256 bits of permissions */ + struct extended_perms_data perms; +}; + +struct avtab_datum { + union { + u32 data; /* access vector or type value */ + struct avtab_extended_perms *xperms; + } u; +}; + +struct avtab_node { + struct avtab_key key; + struct avtab_datum datum; + struct avtab_node *next; +}; + +struct avtab { + struct avtab_node **htable; + u32 nel; /* number of elements */ + u32 nslot; /* number of hash slots */ + u32 mask; /* mask to compute hash func */ +}; + +void avtab_init(struct avtab *h); +int avtab_alloc(struct avtab *, u32); +int avtab_alloc_dup(struct avtab *new, const struct avtab *orig); +struct avtab_datum *avtab_search(struct avtab *h, const struct avtab_key *k); +void avtab_destroy(struct avtab *h); +void avtab_hash_eval(struct avtab *h, char *tag); + +struct policydb; +int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol, + int (*insert)(struct avtab *a, const struct avtab_key *k, + const struct avtab_datum *d, void *p), + void *p); + +int avtab_read(struct avtab *a, void *fp, struct policydb *pol); +int avtab_write_item(struct policydb *p, const struct avtab_node *cur, void *fp); +int avtab_write(struct policydb *p, struct avtab *a, void *fp); + +struct avtab_node *avtab_insert_nonunique(struct avtab *h, + const struct avtab_key *key, + const struct avtab_datum *datum); + +struct avtab_node *avtab_search_node(struct avtab *h, + const struct avtab_key *key); + +struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified); + +#define MAX_AVTAB_HASH_BITS 16 +#define MAX_AVTAB_HASH_BUCKETS (1 << MAX_AVTAB_HASH_BITS) + +#endif /* _SS_AVTAB_H_ */ + |