cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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policy.h (9004B)


      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * AppArmor security module
      4 *
      5 * This file contains AppArmor policy definitions.
      6 *
      7 * Copyright (C) 1998-2008 Novell/SUSE
      8 * Copyright 2009-2010 Canonical Ltd.
      9 */
     10
     11#ifndef __AA_POLICY_H
     12#define __AA_POLICY_H
     13
     14#include <linux/capability.h>
     15#include <linux/cred.h>
     16#include <linux/kref.h>
     17#include <linux/rhashtable.h>
     18#include <linux/sched.h>
     19#include <linux/slab.h>
     20#include <linux/socket.h>
     21
     22#include "apparmor.h"
     23#include "audit.h"
     24#include "capability.h"
     25#include "domain.h"
     26#include "file.h"
     27#include "lib.h"
     28#include "label.h"
     29#include "net.h"
     30#include "perms.h"
     31#include "resource.h"
     32
     33
     34struct aa_ns;
     35
     36extern int unprivileged_userns_apparmor_policy;
     37
     38extern const char *const aa_profile_mode_names[];
     39#define APPARMOR_MODE_NAMES_MAX_INDEX 4
     40
     41#define PROFILE_MODE(_profile, _mode)		\
     42	((aa_g_profile_mode == (_mode)) ||	\
     43	 ((_profile)->mode == (_mode)))
     44
     45#define COMPLAIN_MODE(_profile)	PROFILE_MODE((_profile), APPARMOR_COMPLAIN)
     46
     47#define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL)
     48
     49#define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT)
     50
     51#define profile_is_stale(_profile) (label_is_stale(&(_profile)->label))
     52
     53#define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)
     54
     55/*
     56 * FIXME: currently need a clean way to replace and remove profiles as a
     57 * set.  It should be done at the namespace level.
     58 * Either, with a set of profiles loaded at the namespace level or via
     59 * a mark and remove marked interface.
     60 */
     61enum profile_mode {
     62	APPARMOR_ENFORCE,	/* enforce access rules */
     63	APPARMOR_COMPLAIN,	/* allow and log access violations */
     64	APPARMOR_KILL,		/* kill task on access violation */
     65	APPARMOR_UNCONFINED,	/* profile set to unconfined */
     66};
     67
     68
     69/* struct aa_policydb - match engine for a policy
     70 * dfa: dfa pattern match
     71 * start: set of start states for the different classes of data
     72 */
     73struct aa_policydb {
     74	/* Generic policy DFA specific rule types will be subsections of it */
     75	struct aa_dfa *dfa;
     76	unsigned int start[AA_CLASS_LAST + 1];
     77
     78};
     79
     80/* struct aa_data - generic data structure
     81 * key: name for retrieving this data
     82 * size: size of data in bytes
     83 * data: binary data
     84 * head: reserved for rhashtable
     85 */
     86struct aa_data {
     87	char *key;
     88	u32 size;
     89	char *data;
     90	struct rhash_head head;
     91};
     92
     93
     94/* struct aa_profile - basic confinement data
     95 * @base - base components of the profile (name, refcount, lists, lock ...)
     96 * @label - label this profile is an extension of
     97 * @parent: parent of profile
     98 * @ns: namespace the profile is in
     99 * @rename: optional profile name that this profile renamed
    100 * @attach: human readable attachment string
    101 * @xmatch: optional extended matching for unconfined executables names
    102 * @xmatch_len: xmatch prefix len, used to determine xmatch priority
    103 * @audit: the auditing mode of the profile
    104 * @mode: the enforcement mode of the profile
    105 * @path_flags: flags controlling path generation behavior
    106 * @disconnected: what to prepend if attach_disconnected is specified
    107 * @size: the memory consumed by this profiles rules
    108 * @policy: general match rules governing policy
    109 * @file: The set of rules governing basic file access and domain transitions
    110 * @caps: capabilities for the profile
    111 * @rlimits: rlimits for the profile
    112 *
    113 * @dents: dentries for the profiles file entries in apparmorfs
    114 * @dirname: name of the profile dir in apparmorfs
    115 * @data: hashtable for free-form policy aa_data
    116 *
    117 * The AppArmor profile contains the basic confinement data.  Each profile
    118 * has a name, and exists in a namespace.  The @name and @exec_match are
    119 * used to determine profile attachment against unconfined tasks.  All other
    120 * attachments are determined by profile X transition rules.
    121 *
    122 * Profiles have a hierarchy where hats and children profiles keep
    123 * a reference to their parent.
    124 *
    125 * Profile names can not begin with a : and can not contain the \0
    126 * character.  If a profile name begins with / it will be considered when
    127 * determining profile attachment on "unconfined" tasks.
    128 */
    129struct aa_profile {
    130	struct aa_policy base;
    131	struct aa_profile __rcu *parent;
    132
    133	struct aa_ns *ns;
    134	const char *rename;
    135
    136	const char *attach;
    137	struct aa_dfa *xmatch;
    138	int xmatch_len;
    139	enum audit_mode audit;
    140	long mode;
    141	u32 path_flags;
    142	const char *disconnected;
    143	int size;
    144
    145	struct aa_policydb policy;
    146	struct aa_file_rules file;
    147	struct aa_caps caps;
    148
    149	int xattr_count;
    150	char **xattrs;
    151
    152	struct aa_rlimit rlimits;
    153
    154	int secmark_count;
    155	struct aa_secmark *secmark;
    156
    157	struct aa_loaddata *rawdata;
    158	unsigned char *hash;
    159	char *dirname;
    160	struct dentry *dents[AAFS_PROF_SIZEOF];
    161	struct rhashtable *data;
    162	struct aa_label label;
    163};
    164
    165extern enum profile_mode aa_g_profile_mode;
    166
    167#define AA_MAY_LOAD_POLICY	AA_MAY_APPEND
    168#define AA_MAY_REPLACE_POLICY	AA_MAY_WRITE
    169#define AA_MAY_REMOVE_POLICY	AA_MAY_DELETE
    170
    171#define profiles_ns(P) ((P)->ns)
    172#define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname)
    173
    174void aa_add_profile(struct aa_policy *common, struct aa_profile *profile);
    175
    176
    177void aa_free_proxy_kref(struct kref *kref);
    178struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy,
    179				    gfp_t gfp);
    180struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat,
    181				       const char *base, gfp_t gfp);
    182void aa_free_profile(struct aa_profile *profile);
    183void aa_free_profile_kref(struct kref *kref);
    184struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
    185struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname,
    186				      size_t n);
    187struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name);
    188struct aa_profile *aa_fqlookupn_profile(struct aa_label *base,
    189					const char *fqname, size_t n);
    190struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name);
    191
    192ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label,
    193			    u32 mask, struct aa_loaddata *udata);
    194ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label,
    195			   char *name, size_t size);
    196void __aa_profile_list_release(struct list_head *head);
    197
    198#define PROF_ADD 1
    199#define PROF_REPLACE 0
    200
    201#define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED)
    202
    203/**
    204 * aa_get_newest_profile - simple wrapper fn to wrap the label version
    205 * @p: profile (NOT NULL)
    206 *
    207 * Returns refcount to newest version of the profile (maybe @p)
    208 *
    209 * Requires: @p must be held with a valid refcount
    210 */
    211static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p)
    212{
    213	return labels_profile(aa_get_newest_label(&p->label));
    214}
    215
    216static inline unsigned int PROFILE_MEDIATES(struct aa_profile *profile,
    217					    unsigned char class)
    218{
    219	if (class <= AA_CLASS_LAST)
    220		return profile->policy.start[class];
    221	else
    222		return aa_dfa_match_len(profile->policy.dfa,
    223					profile->policy.start[0], &class, 1);
    224}
    225
    226static inline unsigned int PROFILE_MEDIATES_AF(struct aa_profile *profile,
    227					       u16 AF) {
    228	unsigned int state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
    229	__be16 be_af = cpu_to_be16(AF);
    230
    231	if (!state)
    232		return 0;
    233	return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2);
    234}
    235
    236/**
    237 * aa_get_profile - increment refcount on profile @p
    238 * @p: profile  (MAYBE NULL)
    239 *
    240 * Returns: pointer to @p if @p is NULL will return NULL
    241 * Requires: @p must be held with valid refcount when called
    242 */
    243static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
    244{
    245	if (p)
    246		kref_get(&(p->label.count));
    247
    248	return p;
    249}
    250
    251/**
    252 * aa_get_profile_not0 - increment refcount on profile @p found via lookup
    253 * @p: profile  (MAYBE NULL)
    254 *
    255 * Returns: pointer to @p if @p is NULL will return NULL
    256 * Requires: @p must be held with valid refcount when called
    257 */
    258static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p)
    259{
    260	if (p && kref_get_unless_zero(&p->label.count))
    261		return p;
    262
    263	return NULL;
    264}
    265
    266/**
    267 * aa_get_profile_rcu - increment a refcount profile that can be replaced
    268 * @p: pointer to profile that can be replaced (NOT NULL)
    269 *
    270 * Returns: pointer to a refcounted profile.
    271 *     else NULL if no profile
    272 */
    273static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p)
    274{
    275	struct aa_profile *c;
    276
    277	rcu_read_lock();
    278	do {
    279		c = rcu_dereference(*p);
    280	} while (c && !kref_get_unless_zero(&c->label.count));
    281	rcu_read_unlock();
    282
    283	return c;
    284}
    285
    286/**
    287 * aa_put_profile - decrement refcount on profile @p
    288 * @p: profile  (MAYBE NULL)
    289 */
    290static inline void aa_put_profile(struct aa_profile *p)
    291{
    292	if (p)
    293		kref_put(&p->label.count, aa_label_kref);
    294}
    295
    296static inline int AUDIT_MODE(struct aa_profile *profile)
    297{
    298	if (aa_g_audit != AUDIT_NORMAL)
    299		return aa_g_audit;
    300
    301	return profile->audit;
    302}
    303
    304bool aa_policy_view_capable(struct aa_label *label, struct aa_ns *ns);
    305bool aa_policy_admin_capable(struct aa_label *label, struct aa_ns *ns);
    306int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns,
    307			 u32 mask);
    308bool aa_current_policy_view_capable(struct aa_ns *ns);
    309bool aa_current_policy_admin_capable(struct aa_ns *ns);
    310
    311#endif /* __AA_POLICY_H */