forked from Minki/linux
303 lines
8.5 KiB
C
303 lines
8.5 KiB
C
/*
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* AppArmor security module
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*
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* This file contains AppArmor policy definitions.
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#ifndef __AA_POLICY_H
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#define __AA_POLICY_H
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#include <linux/capability.h>
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#include <linux/cred.h>
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#include <linux/kref.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/socket.h>
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#include "apparmor.h"
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#include "audit.h"
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#include "capability.h"
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#include "domain.h"
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#include "file.h"
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#include "lib.h"
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#include "resource.h"
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struct aa_ns;
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extern const char *const aa_profile_mode_names[];
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#define APPARMOR_MODE_NAMES_MAX_INDEX 4
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#define PROFILE_MODE(_profile, _mode) \
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((aa_g_profile_mode == (_mode)) || \
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((_profile)->mode == (_mode)))
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#define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN)
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#define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL)
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#define PROFILE_IS_HAT(_profile) ((_profile)->flags & PFLAG_HAT)
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#define profile_is_stale(_profile) ((_profile)->flags & PFLAG_STALE)
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#define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)
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/*
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* FIXME: currently need a clean way to replace and remove profiles as a
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* set. It should be done at the namespace level.
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* Either, with a set of profiles loaded at the namespace level or via
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* a mark and remove marked interface.
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*/
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enum profile_mode {
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APPARMOR_ENFORCE, /* enforce access rules */
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APPARMOR_COMPLAIN, /* allow and log access violations */
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APPARMOR_KILL, /* kill task on access violation */
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APPARMOR_UNCONFINED, /* profile set to unconfined */
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};
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enum profile_flags {
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PFLAG_HAT = 1, /* profile is a hat */
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PFLAG_NULL = 4, /* profile is null learning profile */
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PFLAG_IX_ON_NAME_ERROR = 8, /* fallback to ix on name lookup fail */
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PFLAG_IMMUTABLE = 0x10, /* don't allow changes/replacement */
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PFLAG_USER_DEFINED = 0x20, /* user based profile - lower privs */
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PFLAG_NO_LIST_REF = 0x40, /* list doesn't keep profile ref */
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PFLAG_OLD_NULL_TRANS = 0x100, /* use // as the null transition */
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PFLAG_STALE = 0x200, /* profile replaced/removed */
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PFLAG_NS_COUNT = 0x400, /* carries NS ref count */
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/* These flags must correspond with PATH_flags */
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PFLAG_MEDIATE_DELETED = 0x10000, /* mediate instead delegate deleted */
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};
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struct aa_profile;
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/* struct aa_policydb - match engine for a policy
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* dfa: dfa pattern match
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* start: set of start states for the different classes of data
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*/
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struct aa_policydb {
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/* Generic policy DFA specific rule types will be subsections of it */
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struct aa_dfa *dfa;
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unsigned int start[AA_CLASS_LAST + 1];
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};
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struct aa_proxy {
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struct kref count;
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struct aa_profile __rcu *profile;
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};
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/* struct aa_profile - basic confinement data
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* @base - base components of the profile (name, refcount, lists, lock ...)
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* @count: reference count of the obj
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* @rcu: rcu head used when removing from @list
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* @parent: parent of profile
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* @ns: namespace the profile is in
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* @proxy: is set to the profile that replaced this profile
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* @rename: optional profile name that this profile renamed
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* @attach: human readable attachment string
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* @xmatch: optional extended matching for unconfined executables names
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* @xmatch_len: xmatch prefix len, used to determine xmatch priority
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* @audit: the auditing mode of the profile
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* @mode: the enforcement mode of the profile
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* @flags: flags controlling profile behavior
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* @path_flags: flags controlling path generation behavior
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* @size: the memory consumed by this profiles rules
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* @policy: general match rules governing policy
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* @file: The set of rules governing basic file access and domain transitions
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* @caps: capabilities for the profile
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* @rlimits: rlimits for the profile
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*
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* @dents: dentries for the profiles file entries in apparmorfs
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* @dirname: name of the profile dir in apparmorfs
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*
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* The AppArmor profile contains the basic confinement data. Each profile
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* has a name, and exists in a namespace. The @name and @exec_match are
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* used to determine profile attachment against unconfined tasks. All other
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* attachments are determined by profile X transition rules.
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*
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* The @proxy struct is write protected by the profile lock.
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*
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* Profiles have a hierarchy where hats and children profiles keep
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* a reference to their parent.
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*
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* Profile names can not begin with a : and can not contain the \0
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* character. If a profile name begins with / it will be considered when
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* determining profile attachment on "unconfined" tasks.
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*/
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struct aa_profile {
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struct aa_policy base;
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struct kref count;
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struct rcu_head rcu;
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struct aa_profile __rcu *parent;
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struct aa_ns *ns;
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struct aa_proxy *proxy;
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const char *rename;
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const char *attach;
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struct aa_dfa *xmatch;
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int xmatch_len;
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enum audit_mode audit;
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long mode;
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long flags;
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u32 path_flags;
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int size;
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struct aa_policydb policy;
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struct aa_file_rules file;
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struct aa_caps caps;
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struct aa_rlimit rlimits;
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unsigned char *hash;
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char *dirname;
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struct dentry *dents[AAFS_PROF_SIZEOF];
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};
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extern enum profile_mode aa_g_profile_mode;
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void __aa_update_proxy(struct aa_profile *orig, struct aa_profile *new);
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void aa_add_profile(struct aa_policy *common, struct aa_profile *profile);
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void aa_free_proxy_kref(struct kref *kref);
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struct aa_profile *aa_alloc_profile(const char *name);
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struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat);
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void aa_free_profile(struct aa_profile *profile);
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void aa_free_profile_kref(struct kref *kref);
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struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
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struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname,
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size_t n);
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struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name);
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struct aa_profile *aa_fqlookupn_profile(struct aa_profile *base,
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const char *fqname, size_t n);
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struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name);
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ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace);
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ssize_t aa_remove_profiles(char *name, size_t size);
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void __aa_profile_list_release(struct list_head *head);
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#define PROF_ADD 1
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#define PROF_REPLACE 0
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#define unconfined(X) ((X)->mode == APPARMOR_UNCONFINED)
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/**
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* aa_get_profile - increment refcount on profile @p
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* @p: profile (MAYBE NULL)
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*
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* Returns: pointer to @p if @p is NULL will return NULL
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* Requires: @p must be held with valid refcount when called
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*/
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static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
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{
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if (p)
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kref_get(&(p->count));
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return p;
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}
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/**
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* aa_get_profile_not0 - increment refcount on profile @p found via lookup
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* @p: profile (MAYBE NULL)
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*
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* Returns: pointer to @p if @p is NULL will return NULL
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* Requires: @p must be held with valid refcount when called
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*/
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static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p)
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{
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if (p && kref_get_not0(&p->count))
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return p;
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return NULL;
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}
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/**
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* aa_get_profile_rcu - increment a refcount profile that can be replaced
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* @p: pointer to profile that can be replaced (NOT NULL)
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*
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* Returns: pointer to a refcounted profile.
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* else NULL if no profile
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*/
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static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p)
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{
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struct aa_profile *c;
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rcu_read_lock();
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do {
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c = rcu_dereference(*p);
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} while (c && !kref_get_not0(&c->count));
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rcu_read_unlock();
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return c;
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}
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/**
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* aa_get_newest_profile - find the newest version of @profile
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* @profile: the profile to check for newer versions of
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*
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* Returns: refcounted newest version of @profile taking into account
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* replacement, renames and removals
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* return @profile.
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*/
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static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p)
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{
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if (!p)
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return NULL;
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if (profile_is_stale(p))
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return aa_get_profile_rcu(&p->proxy->profile);
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return aa_get_profile(p);
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}
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/**
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* aa_put_profile - decrement refcount on profile @p
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* @p: profile (MAYBE NULL)
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*/
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static inline void aa_put_profile(struct aa_profile *p)
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{
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if (p)
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kref_put(&p->count, aa_free_profile_kref);
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}
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static inline struct aa_proxy *aa_get_proxy(struct aa_proxy *p)
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{
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if (p)
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kref_get(&(p->count));
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return p;
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}
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static inline void aa_put_proxy(struct aa_proxy *p)
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{
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if (p)
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kref_put(&p->count, aa_free_proxy_kref);
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}
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static inline int AUDIT_MODE(struct aa_profile *profile)
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{
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if (aa_g_audit != AUDIT_NORMAL)
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return aa_g_audit;
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return profile->audit;
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}
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bool policy_view_capable(void);
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bool policy_admin_capable(void);
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bool aa_may_manage_policy(int op);
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#endif /* __AA_POLICY_H */
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